Reposting an article written by someone else, I hope it will be helpful to you:
Turbine compressors and positive displacement compressors each have their own strengths
As The rise of a single series of technological processes and the continuous expansion of economic production scale, as well as the breakthrough and improvement of turbine compressor high exhaust pressure technology, the reliability of uninterrupted long-term continuous operation is guaranteed, and foreign synthetic ammonia, air separation, chemical and Ultra-large compressors used in the petrochemical industry have been dominated by turbine types. The same is true for the compressor selection trend of domestic owners.
There is no doubt that turbine compressors are most suitable for large flow rates and extra large capacities, and are more convenient when the exhaust pressure is below medium pressure.
Positive compressors that do not have the above-mentioned advantages of turbine compressors (in the past, piston compressors and positive displacement rotary compressors were the mainstream) dominate the ultra-high-pressure and very-high-pressure fields. It has the characteristics of high performance-price ratio and energy-saving operation in high pressure, medium pressure and small and medium flow situations.
Although the performance parameters (flow, pressure) ranges that turbine compressors and positive displacement compressors can achieve slightly overlap, overall they have their own strengths and complement each other.
The trend of reciprocating piston compressors used in process processes
1. Today, whether abroad or domestic, there are three hot spots in the manufacturing, sales and technology development of reciprocating piston compressors used in process processes. :
a. Various devices and processes in oil refining and petrochemical (downstream) enterprises require various types of compressors with large and medium power, medium and high pressure hydrogen and other media.
b. Petroleum and natural gas (upstream) enterprises use natural gas gathering and transportation and natural gas reinjection and production (or gas injection into underground gas storage) with various types of large and medium power, medium and high pressure natural gas compressors.
c. CNG (Compressed Natural Gas) compressors are used in natural gas vehicle filling stations.
2. Labyrinth Compressor
The labyrinth compressor is unique among reciprocating piston compressors used in technological processes. Through careful design and precision manufacturing, it realizes the processing of cylinders and packings in a non-contact manner. Gas seal. Therefore, it is not only a type of cylinder oil-free lubrication compressor, but also may be the only choice when operating under ultra-high temperature or ultra-low temperature conditions, or when compressing absolutely dry gas. When brewing and food and beverage factories deliver compressed gases that are in direct contact with food and beverages to the production workshop, it is more hygienic and reasonable to use a labyrinth compressor than a contact ring cylinder oil-free lubrication compressor. In terms of safety in pharmaceutical processes and oxygen equipment, labyrinth compressors are relatively superior.
This concludes that the labyrinth compressor will definitely gain wider and deeper adoption.
The main service areas of my country's compressor manufacturing industry
1. Supporting major technical equipment for the national economy, such as providing large and ultra-large processing equipment for various large-scale oil refining units and coal chemical equipment. Hydrogen compressors provide multiple specifications of large and medium-sized natural gas compressors for gathering and transportation and gas injection for the natural gas industry. We provide large and medium-sized nitrogen and hydrogen compressors and carbon dioxide compressors for the fertilizer and explosives industries. We also provide large and medium-sized nitrogen and hydrogen compressors and carbon dioxide compressors for the coal, metallurgy, electric power, and textile industries. , medicine, food and beverage industries provide power air compressors/pure, oil-free, sterile compressed air, special high-pressure, high-parameter, high-performance compressors for nuclear submarines and rocket launches.
2. Provide supporting services for environmentally friendly clean fuel vehicle filling stations to improve the environment and energy structure, and provide a variety of CNG compressors and LPG compressors for natural gas vehicle or liquefied petroleum gas vehicle filling stations. Provide key equipment.
3. Serving an extremely wide range of compressed air application sites, from large-scale mining, ferrous metal/non-ferrous metal/rare metal smelting, small and medium-sized air separation devices, small and medium-sized pressure swing adsorption gas production devices, roads From construction to various home gas-consuming uses.
The jump of China's compressor manufacturing industry
1. Large-scale reciprocating piston compressors for technological processes
Globally, large-scale reciprocating piston compressors for technological processes The hot selling point of compressors is the hydrogenation compressors required by refineries in the petrochemical industry, and my country is one of the hottest spots, with both demand and competition.
An important aspect of the energy security strategy being implemented in our country is the promotion of large-scale coal liquefaction projects. The ultra-large hydrogen compressor is an indispensable core equipment.
Shenyang Gas Compressor Co., Ltd., Wuxi Compressor Co., Ltd., Shanghai Compressor Co., Ltd., Shanghai Dalong Machinery Factory, Sichuan Dachuan Compressor Co., Ltd., Weifang Shengjian Compressor Factory, Hangzhou Hangzhou Powerful companies such as Oxygen Compressor Co., Ltd., with a high domestic market share, provide many key equipment to petrochemical, chemical, oil and gas, industrial gas and other industries - large reciprocating equipment for various specifications of process processes. Piston compressor.
Among them, Shenyang Gas Compressor Co., Ltd. has successfully integrated independent research and development with technical cooperation, and has world-class proprietary technology for large-scale reciprocating piston compressors (piston force 100kN~1250kN). Manufactures a full range of large-scale symmetrical balanced compressors. The models that have been launched have a maximum power of 5000kW, a maximum piston force of 800kN, and a maximum of 6 rows. Its main structural features are three:
a. The mechanical-hydraulic connection between the piston rod and the crosshead uses three times of application and release of ultra-high oil pressure of up to 150MPa to prestress the elastically stressed parts, effectively reducing the unavoidable use of purely mechanical connection methods. The piston rod is subjected to high stress amplitude, and the severe stress concentration at the thread root of the large-diameter piston rod in traditional structure does not exist, ensuring the reliable operation of the piston rod.
b. The strong rigidity and multi-row modular fuselage design is optimized by mechanical processing. The fuselage has no walls perpendicular to the direction of force, thus obtaining a large load-bearing capacity.
c. The compressor transmission mechanism is "reverse lubricated", and the crankshaft does not need oil holes, so it is free from the stress concentration at multiple oil holes of the traditional crankshaft. It has high strength, good rigidity, and easy processing, and the crosshead pin/crosshead sliding shoe is changed The place where the specific pressure is high and the oil pressure is the lowest is the place where the specific pressure is low and the oil pressure is the highest. Therefore, the transmission mechanism has little wear, low temperature rise, and small thermal expansion value, and it is easy to ensure the precise linearity of the piston rod movement.
Obviously, the safety and reliability of its compressor operation are guaranteed.
The large-scale reciprocating piston compressors produced by Shenyang Gas Compressor Co., Ltd. are among the largest compressors in the world in terms of unit power and piston force. For example, the 4M80-30/22-200-BX new hydrogen compressor that has been successfully operated in very large petrochemical companies such as Guangdong Maoming Petrochemical Co., Ltd. is used in a 2 million tons/year residual oil desulfurization and hydrogenation unit and is symmetrically balanced. Type, 4 rows, piston force 800kN, exhaust pressure 20MPa, shaft power 3250kW, mass 68.6t, cooler and other auxiliary machinery mass 16.2t, motor mass 47t, appearance 9690mm×4680mm×1950mm. So far, only one company, Guangdong Maoming Petrochemical Company, has as many as 20 4M80-class large compressors in operation for Shenyang Gas, making contributions to the development of my country's petrochemical industry.
In general, due to the concerted efforts of various units in my country's compressor manufacturing industry, large-scale reciprocating piston compressors for domestic processes have not only successfully replaced imported machines, but their actual operating conditions are also better than that of certain compressors. Some imported machines. Due to its comprehensive performance-price ratio advantage, it already has good conditions to go overseas with petrochemical complete sets of equipment. And this has also been implemented.
2. Split and integrated gas motorcycle natural gas compressor units
Under the impact of pipeline gas turbines and centrifugal natural gas compressor units, high power (up to 10067kW [13500HP ]) Integral gas motorcycle compressors have gradually withdrawn from the stage of history. Today's integrated gas motorcycle compressors are all symmetrically balanced structures. The power cylinder and compression cylinder are horizontally symmetrical. The power cylinder piston and compression cylinder piston move in opposite or reverse directions. They have excellent inertial force balance, low speed, heavy load, and durability. , no on-duty personnel required, low operating costs, power 630kW and below.
This type of gas motorcycle compressor unit is a skid-mounted organic whole composed of a power cylinder that burns natural gas and a compression cylinder that compresses natural gas. It does not require external main power supply and water source. The cooling, lubrication, ignition, and Automatic control and other systems also do not require external power. Obviously, it is an ideal gas gathering and transportation equipment for scattered oil and gas fields, marginal oil and gas fields and late-stage oil and gas fields that have no power or difficult to connect to electricity.
China National Petroleum Corporation Sichuan Petroleum Administration Bureau Chengdu Natural Gas Compressor Factory and Sichuan Dachuan Compressor Co., Ltd. are the main suppliers of integrated gas motorcycle compressor units in the vast oil and gas fields in my country.
Among them, Chengdu Natural Gas Compressor Factory alone has manufactured nearly 300 ZTY series products with good operating performance.
The "split" large-scale natural gas compressor unit is the main type used for gas gathering and transportation in oil and gas fields. It is mostly directly driven by a high-power, high-speed natural gas engine (or directly driven by an electric motor) and combined with a large wind turbine. The refrigerated cooler is an independent skid-mounted unit, which is indispensable for oil and gas fields.
The RDS series of large and medium-power (up to 3000kW) compressor units produced by the Third Machinery Factory of Jianghan Petroleum Administration Bureau of China Petrochemical Corporation (Wujiashan, Wuhan City) falls into this category and is a combination of technical cooperation and independence. The result of a combination of innovation.
3. CNG compressor for natural gas vehicle filling stations
The world is facing the reality that crude oil can only be extracted for more than 40 years, but natural gas can be extracted for more than 70 years. Our country is facing: focusing on energy diversification, strengthening the West-East Gas Transmission Project, vigorously protecting the environment, actively exploiting/using abundant land/sea natural gas, importing liquefied natural gas, and realizing natural gas (import) in the near future The international network of pipelines and the increased development of coalbed methane (the follow-up natural gas from oil and gas fields), which has abundant reserves, are a great situation.
Natural gas vehicles have significant comprehensive environmental/technical/economic advantages such as mature technology, cleanliness, safety and good economy.
Since the world’s first modern natural gas vehicle filling station was built in northern Italy in 1931 and the first domestically equipped natural gas vehicle filling station was built in Rong County, Sichuan Province in 1988, the variety, sales volume and technological progress of CNG compressors at home and abroad have Become more active. Today, CNG compressors have become one of the hottest selling points in the global compressor market, especially in my country, Southeast Asia and South America.
The stand-alone power of CNG compressor is not very large. However, in recent years, it has been highly enriched with many advanced technologies of contemporary reciprocating piston process compressors. Objectively speaking, CNG compressors have almost become the only category of reciprocating piston compressors used in global processes that can be mass-produced. With the increasing shortage of oil, the urgency of controlling urban vehicle exhaust pollution, the phased implementation of my country's West-East Gas Transmission and subsequent projects, and the gradual popularization of gas energy in residential communities, CNG compressors will surely have greater development at home and abroad.
Although it started very late, the domestically produced CNG compressor is close to the world's advanced level. At the beginning of the new century, it has been full of wonders and brilliance. From different angles, it has gradually sublimated its comprehensive technical level to no less than to the extent of imported goods. As a result, it has not only made new contributions to the construction of domestic natural gas vehicle filling stations, but also has the extraordinary strength to compete with famous foreign brands after my country's accession to the WTO, and at the same time, it has entered the international market. Due to their high cost performance and low price, the number of domestically produced CNG compressors sold overseas is gradually increasing, and the number of countries and regions that are willing to accept Chinese CNG compressors is also expanding. Eighty percent of the output value of a private enterprise in Sichuan Province is exported CNG compressors!
The fully air-cooled unit of Sinopec Jianghan No. 3 Machinery Plant is most suitable for operation in arid and cold areas. It is equipped with a soundproof cover unit for use in downtown areas. , has successfully developed various flow models with low suction pressure 0.3MPa ~ 0.5MPa and high suction pressure 2.0MPa; Wuxi Compressor Co., Ltd.'s cylinder oil-free lubrication unit can adapt to a wide range of low suction pressure (0.2 MPa～0.5MPa), the air supply quality is excellent, the cooling method is water cooling and the hollow piston rod is cooled through oil to ensure the normal operation of the packing and piston rings, and it can operate in urban areas without a sound insulation cover; Nanjing Compressor Co., Ltd. The unit is highly compact, has a suction pressure range of 0.5MPa ~ 1.0MPa, and a large gas supply capacity. It is suitable for building large conventional stations/refueling master stations in urban high and medium pressure natural gas pipeline networks.
The 2D4 model of the Sanji Factory, which pioneered the domestic fully air-cooled CNG compressor unit and obtained the national patent certificate, began operating in the Zhongyuan Oilfield in 2001. After configuring three gas filling stations in the Chengdu area, the Xi'an Natural Gas Corporation's North Second Ring Road gas filling station twice selected the 2D4 machine in 2003 and 2004. This type of unit in many gas filling stations has experienced the test of scorching heat and severe cold natural conditions under no backup and heavy load (operating for more than 20 hours a day) conditions, and has been operating in excellent condition so far. Its excellent design and very low specific pressure value on the bearing surface of the transmission parts ensure safe, reliable operation and long service life.
Chongqing Gas Compressor Factory Co., Ltd., which developed the first domestic CNG compressor, has not only vigorously expanded its water-cooling units with multiple structural types, varieties, and types for station use, but also exported them to Southeast Asia. Following the No. 3 Machinery Factory, air-cooling units were developed and the service area was expanded.
Enric (Bengbu) Compressor Co., Ltd. not only borrowed relevant parts of imported German and Austrian compressor technology and domestic technology to supply conventional station CNG compressors earlier and in various varieties, but also actively developed Use the machine at the sub-station and the machine at the parent station. In particular, the urban natural gas project implemented by its parent company, ENN Group Corporation, has broadened the application areas of its CNG compressors and increased its order volume.
Beijing Jingcheng Environmental Protection Industry Development Co., Ltd. has developed an air-cooled CNG compressor with a power of 160kW required by Shengli Oilfield based on the air test and identification of small air-cooled machines.
Sichuan Dachuan Compressor Co., Ltd., Sichuan Jinxing Compressor Manufacturing Co., Ltd., Zigong Tongda Machinery Manufacturing Co., Ltd., Zigong Shanchuan Gas Compressor Co., Ltd., Sichuan Southern Gas Compressor Co., Ltd. and other CNG in Sichuan and Chongqing areas Compressor manufacturers have all made positive achievements.
The CNG compressor for large-scale conventional natural gas vehicle filling stations developed by Shanghai Dalong Machinery Factory is a 4-row, symmetrically balanced type with a piston force of 60kN and a cooling method of air and water mixed cooling. It has become One of the leading models of the Sino-British joint venture-Shanghai Comprais Dalong High Voltage Equipment Co., Ltd.
4. Special high-pressure compressors
As a special group of compressors, special high-pressure compressors have high parameters and high-performance technical characteristics, such as: exhaust pressure up to Several, the ambient temperature is as low as ×× and as high as ××, the ambient relative humidity is ××, the salt spray is ××, the trim is ××, the heeling is ××, the overall dimensions are less than ××, the weight is less than ××, and the dew point is less than × ×, the vibration intensity is lower than ××, the noise sound power level is less than ××, the average trouble-free running time is greater than ××, the number of starts per unit time is greater than ××, etc.
Special high-pressure compressors with small power and dimensions stand at one of the few pinnacles of compressor design/manufacturing technology due to their extremely high-tech content.
The overall level of domestic special high-pressure, high-parameter, high-performance compressor clusters is no less than that of outdoor compressors. There is no doubt that they have contributed indispensably to my country's excellent support equipment in high-tech fields such as manned space flight, as well as in defending the country's homeland, maritime borders and airspace. The leader in my country's compressor manufacturing industry has been working silently for half a century and has made outstanding contributions!
5. Diaphragm compressor
After more than 40 years of development, the production capacity and technical level of products of my country's diaphragm compressor manufacturing enterprises can no longer be underestimated. At present, domestic diaphragm compressors can not only completely replace imported products, but also have considerable strength to compete within WTO rules.
The diaphragm compressors developed by Beijing Jingcheng Environmental Protection Industry Development Co., Ltd. have been successfully used in nuclear power plants and national defense projects in batches.
The ultra-high-pressure 200MPa diaphragm hydrogen compressor unit jointly developed by China General Machinery Engineering Corporation of the National Machinery Equipment Group and Shanghai Dalong Machinery Factory has high technical standards and operational reliability.
Beijing Huizhi Mechanical and Electrical Equipment Co., Ltd. has successfully developed a novel symmetrical balanced metal diaphragm compressor with complete independent intellectual property rights.
The Beijing Municipal Science and Technology Commission organized experts to pass the appraisal of the scientific and technological achievements of Huizhi Company's "GD134-30/160 symmetrical balanced diaphragm compressor", confirming its innovation points and filling the gap in my country's large-scale diaphragm compressors. There is no gap in machine varieties, and its technical performance indicators are determined to be domestically leading and close to the international advanced level. This technology of Huizhi Company has obtained the utility model patent certificate from the State Intellectual Property Office.
Determined by the extremely high air tightness and high working pressure of metal diaphragm compressors, it is suitable for military and civilian nuclear energy technology, nanotechnology, chemical defense, national defense, chemical industry, petrochemical industry, and gas industry. , medical treatment, pharmaceutical industry, and supercritical carbon dioxide extraction fields to compress and transport gases. It is especially suitable for compressing highly toxic, highly corrosive, radioactive, rare, extremely pure, extremely dry, flammable and explosive gases. This special function is unique to other structural types. Not available with positive displacement or dynamic compressors.
The membrane cavity profile is optimized, the diaphragm life span is exceeded, the multi-layer diaphragm can ensure safety while reporting a rupture alarm, remote membrane head and pneumatic membrane head technology, membrane cavity air pressure and hydraulic cylinder oil pressure difference maintenance technology, etc. They have also contributed to the surge in demand for domestic diaphragm compressors in recent years.
There is no doubt that domestic diaphragm compressors have excellent performance-price ratio and low price advantages in the international market. In fact, its export performance is also promising.
6. Positive displacement rotary compressor
The selection concept of domestic compressor owners has shifted from attaching great importance to the power consumption of compressor operation to a more objective and comprehensive consideration. Factors such as daily labor costs for operators, labor costs for maintenance, spare parts and consumables, direct and indirect economic losses due to accidental shutdowns, etc., promote owners to choose screw compressors. Typical mobile and fixed screw air compressors.
Following the advanced industrial countries, the design and manufacturing technology of domestic oil-injected screw air compressors are becoming increasingly mature, while dry (oil-free) screw air compressors are still inferior.
Screw compressors for process flow are particularly suitable for compressing medium and low-pressure highly corrosive, highly toxic, droplet-containing, and easily liquefied gases, and their market share at home and abroad will continue to increase.
Shanghai Compressor Co., Ltd. still takes the lead among domestic screw compressors used in technological processes, with both production and sales booming and exports.
The technological progress of screw air compressors includes, in addition to the important aspect of profile (tooth shape), improvements in oil, gas, cooling, and automatic control systems, optimization of the configuration of each unit of the unit, and measures to reduce and isolate noise. The role played cannot be underestimated. Today, more Chinese companies are comprehensively improving screw compressors.
my country's manufacturing companies in the four industries of compressors, refrigeration machines, industrial pumps, and speed reducers all have special milling machines and grinders for screw rotors, and they are all top international brands. Their total number is astonishing. . The author estimates that the total number of rotor-specific machine tools in the four general machinery industries ranks first in the world (by country), which can be said to have huge manufacturing potential.
Chinese screw air compressor manufacturing companies on both sides of the Taiwan Strait have strong manufacturing capabilities and prosperous production and sales, such as: Wuxi Compressor Co., Ltd., Nanjing Compressor Co., Ltd. , Jiangxi Gas Compressor Co., Ltd., Jiangsu Chaoli Machinery Co., Ltd., Wuxi Wuyang Side Compressor Co., Ltd., Shenyang Air Compressor Manufacturing Factory, Yantai Lanxing Compressor Co., Ltd., Shanghai Bolite Compressor Co., Ltd., Ningbo Xinda Screw Compressor Co., Ltd., as well as Taiwan Fusheng Machinery Co., Ltd. and its three manufacturing and R&D bases in Shanghai, Beijing and Zhongshan.
It is very different from foreign countries where single screw compressors are basically used to compress refrigeration media. Single screw compressor technology with unique Chinese characteristics has created the current oil-injected single screw air compressor as the main body. Strong production bases - Shanghai Jialis Machinery Co., Ltd., Guangdong Zhengli Precision Machinery Co., Ltd., Fuxin Jinhao Air Compressor Co., Ltd., Shanghai Feihe Industrial Group Co., Ltd., etc. What is particularly commendable is that the people with lofty ideals in these enterprises have worked hard and entered into a new era, and have won a number of national patent certificates for single-screw compressors and related technologies, which have been transformed into productivity. Not only are the measured technical and economic indicators of single-screw air compressors among the best in the world, but the wide variety of specifications can meet the needs of all parties, while achieving both production and sales and exports.
7. Reciprocating piston power air compressors and micro air compressors
In my country, the field of power air compressors with a volumetric flow rate of 3m?/min or more (stationary type and mobile), screw and reciprocating piston air compressors are the mainstream.
The advancement and economy of an air compressor depend on design, manufacturing costs (raw material costs, equipment depreciation costs, labor costs, etc.), and operating costs (power consumption, water consumption, labor costs, parts replacement costs, etc.) comprehensive results. The unit price of electricity in our country is high and the labor fee is low. This specific national situation is very different from that in foreign countries. From this, it was decided:
a. It is advisable to advocate the development of screw air compressors and form an appropriate number of manufacturing enterprises with economical production scale. Their main service areas are the use departments that require higher comprehensive performance of air compressors.
b. The operation reliability of reciprocating piston air compressors should be improved and cheap, easy-to-use products should be provided to the society.
Obviously, an air compressor of a specific structural type can achieve good technical and economic benefits only when it is in the optimal parameter range.
It is necessary to explain that the "optimal parameter range" is developing and changing, and even in the same historical period, industry insiders will have different definitions of its specific range.
my country's reciprocating piston power air compressor has an excellent technical foundation of independent research and development and strong manufacturing strength, and its derivative products cover a wide range of services. Nanjing Compressor Co., Ltd., Liuzhou Liuerkong Machinery Co., Ltd., Liuzhou Huanyu Compressor Co., Ltd., Chongqing Gas Compressor Factory Co., Ltd., Weifang Shengjian Compressor Factory, Beijing Jingcheng Environmental Protection Industry Development Co., Ltd., Jiangxi Gas Compressor Co., Ltd., Yuyao Jiehua Compressor Co., Ltd., Changchun Air Compressor Manufacturing Co., Ltd., Taiyuan Gas Compressor Factory, China Railway Construction Corporation Xuzhou Machinery General Factory, Jinan Compressor Co., Ltd., Hebei Wuqiao Air Compressor Co., Ltd. This is true for companies such as Responsible Company and Xiangtan Compressor Co., Ltd.
The selection factors that cannot be ignored are: reciprocating piston power air compressors are not only cheap, but also energy-saving in operation.
Reciprocating piston micro air compressors with a volumetric flow rate of less than 3m?/min are extremely versatile and are in great demand. Under the modern production and sales model, the selling price of a single machine is limited, so only manufacturing companies with a large production scale and certain technical content can gain a foothold and export their products.
Changchun Air Compressor Manufacturing Co., Ltd., Jiangsu Chaoli Machinery Co., Ltd., Shanghai Dongfang Compressor Manufacturing Co., Ltd., Shenyang Dongling Air Compressor Co., Ltd., Anshan Oil-free Air Compressor Co., Ltd., Beijing Jin Huan Compressor Co., Ltd., Tianjin Gas Compressor Factory, Tianjin Compressor Factory, Shijiazhuang Sanyuan Compressor Factory, Taiyuan Second Gas Compressor Factory, Nanjing Huaguan Compressor Co., Ltd., the 48th People's Liberation Army No. 12 Factory, Maanshan Zhengleng Compressor Co., Ltd., Yantai Lanxing Compressor Co., Ltd., Wuxi Liyuan Compressor Co., Ltd., Changde General Compressor Co., Ltd., Kaifeng Air Compressor Factory, Foshan Coral Compressor Co., Ltd. , Liuzhou Jinxiang Machinery Manufacturing Co., Ltd., Chongqing Small Compressor Factory and other enterprises have a long history of producing reciprocating piston micro-miniature air compressors and considerable production capacity, which can better meet social needs.
A group of Zhejiang and Zhejiang companies represented by Zhejiang Xinlei Mechanical and Electrical Co., Ltd., Zhejiang Hongyou Compressor Manufacturing Co., Ltd. and Quanzhou Lida Machinery Co., Ltd. in Fujian Province are located in Zeguo Town, Wenling City, Zhejiang Province. As a rising star in the Fujian region, private reciprocating piston micro air compressor manufacturing enterprises have multi-national quality certification certificates and have achieved extremely large-scale production. They have low cost, high efficiency, good product appearance, and stable quality. Most of their products are far away. It is sold in Europe, the United States, Australia and New Zealand, with a total annual export volume of more than millions of units, becoming the main supplier of household reciprocating piston micro-air compressors in the world.
8. Mining air compressor
Safe production is an eternal theme in the mining industry, especially the coal industry.
The mining disaster is heartbreaking and heartbreaking. The root cause is undoubtedly caused by violations of laws, regulations and neglect of management. However, the safety of the operation of coal industry equipment must not be ignored.
As an important mining equipment in the coal industry, air compressors provide indispensable power compressed air for direct mining machinery. So, what about the safety of compressed air and air compressor operation?
As we all know, about one-third of air, a gaseous mixture at room temperature, is oxygen. The chemical reactivity of oxygen goes without saying. The oxygen in the air, the lubricating oil used in the compressor cylinder, and the possible excessive exhaust temperature all pose potential safety hazards to the operation of the air compressor. As for the excessively high flow rate of compressed air and the static charge of particulate rust contained in the air flow, they are the causes of explosion accidents in compressed air pipelines.
In the early mining reciprocating piston air compressors, the cylinders were lubricated with oil and were single-stage compression. Later, it evolved into two-stage compression, and the exhaust temperature at each stage was significantly reduced, which was beneficial to safe operation and energy saving, but the cylinder was still filled with oil. In other words, the compressed air provided by the air compressor still contains oil mist. Lubricating oil and moisture condensed in gas storage tanks and compressed air pipelines are potentially huge safety hazards. If the oil and water are not discharged in time, it will not only increase the flow rate of the compressed air in the pipeline, but also increase the electrostatic effect of the inevitable solid particles in the air flow. It may also cause ice blockage, which may lead to serious consequences.
In order to overcome the threat of oil and moisture in compressed air to the safe operation of air compressors, as early as the early 1950s, the relevant safety regulations of the former Soviet Union had clearly stipulated that after setting up an air compressor cooler. In the following 20 to 30 years, my country's relevant technical specifications went through a process from "after-cooler should be installed" to "after-cooler should be installed". Obviously, the setting of the aftercooler not only reduces pipeline corrosion and reduces the generation of solid particles, but also widens the distance between the air compressor exhaust temperature and the flash point of the lubricating oil. It also greatly weakens the impact of oil mist and water on safety. adverse effects on production.
In order to fundamentally ensure the safe operation of mining reciprocating piston air compressors, far-sighted companies in the compressor industry have resolutely implemented oil-free lubrication of cylinders and used underground air compressors. Compressors and air compressors for ground compressed air stations are included in the same new series. There is no doubt that this is a good solution to the root cause. While cutting off the source of oil mist, the exhaust temperature values ??at all levels of the air compressor have been completely decoupled from the flash point of the lubricating oil. That is, no matter how high the exhaust temperature is, it will not cause the compressed air pipeline to explode. What's more, its exhaust temperature can be completely controlled. Of course, the inherent energy-saving advantages and low cost of mining reciprocating piston air compressors can only be established when using a crosshead structure.
The rotary air compressor, due to the implementation of oil injection internal cooling during the compression process, as well as the exhaust oil and gas separation and oil filtration after compression, is fully capable of providing low temperature and very low oil content, and meets safety standards. The compressed air required is also an ideal model for mining air compressors.
The vast majority of mining air compressors in service are of the reciprocating piston type and the cylinder is oil-filled (or splash) lubricated. For safe operation, the operator must strictly abide by the relevant provisions of the instruction manual. On this basis, it is indeed necessary to vigorously implement safety technical transformation - with a small economic investment, add or modify a few parts to achieve oil-free lubrication of the cylinder.
The development and utilization of my country's abundant coalbed methane resources have also been initially carried out. The application of this new energy also requires the support of compressors. This shows that in terms of comprehensive utilization of coal resources and energy conservation, the compressor industry can also make great achievements!
The surface compressed air station used in mining supplies air to the underground. There are bound to be excessively long compressed air pipelines, large resistance losses, many air leakage points, large pipe consumption, and the actual exhaust emissions when the air compressor is running. Defects such as high air pressure requirements. Therefore, using an air compressor with appropriate volume flow rates to run in underground tunnels has very obvious energy-saving and material-saving effects. Of course, due to the objective fact that underground air has a certain gas content, it is unshirkable to ensure the safe operation of mining air compressors!
In the early 1960s, Mr. Chen Keming developed a mining underground symmetrical balanced air compressor with a volumetric flow rate of 10m?/min at the then Shenyang Gas Compressor Factory. In the early 1980s, the then Jiangxi Gas Compressor Factory successfully operated an underground L-type air compressor with a volumetric flow rate of 20m?/min in several coal mines. At present, many compressor manufacturing companies use several types of reciprocating piston and rotary air compressors to serve underground, which has produced huge social/economic benefits.
9. Key points of the "Eleventh Five-Year Plan" for the compressor industry
a. The practical needs and urgency of developing 1000kN-1250kN ultra-large piston force reciprocating piston compressors for process processes
b. Exploit the strengths of reciprocating piston compressors in the medium and high-pressure fields, avoid their shortcomings in low-pressure and large-flow ranges, control the repetitive production of low-end products, and develop compressors for high-pressure natural gas reinjection And drilling booster air compressors, high-speed split compressors and new oil-free lubrication compressors;
c. Give full play to the technology of screw, single-screw and other positive displacement rotary compressors - economic advantages ;
d. The improvement of the technical connotation of screw compressors for domestic processes and the importance of users being practical in their selection;
e. Research and development of compact centrifugal air compressor units with small and medium flow rates The objective demand;
f. The advanced models of domestic CNG compressors used in natural gas vehicle filling stations, their operating performance has been proven to be as good as imported products, and they have also gone abroad, with excellent performance—— The price ratio and competitive potential need to be in line with international standards;
g. Further improve the research and development of labyrinth compressors and create process positions that other structural compressors are difficult to fulfill;
h. It is important to expand the performance parameter coverage of diaphragm compressors with strong market demand;
i. Ensure the development of extremely compact compressors with high performance, high parameters, low noise and low vibration required for national defense support Research, development and production;
j. While continuing to export large quantities of small reciprocating piston air compressors, they need to adjust their positioning to improve actual economic returns;
k. Independent research and development, ownership The extreme importance of complete independent intellectual property rights and the good use of computer network technology;
l. Air and other gas purification devices and key components of compressors all need to focus on in-depth research and development.
The people with lofty ideals in my country's compressor manufacturing industry are determined to continue to work hard to create a new situation in which the technology/economics and trade of the compressor manufacturing industry are increasingly prosperous, and to serve the world inside and outside the Great Wall, north and south of the Yangtze River, with suitable products with excellent performance and price ratio. Move in the global economic circle and stand among the world's strongest compressors!
Let us work together to encourage each other!