Author/Source: Jiuzhou Steel Plate Warehouse Release Time: 2012-10-2123: 04: 08
A, large reserves, single reserves 1-65438+ ten thousand tons.
B, the investment is small, and the investment per ton of storage is below 200 yuan, which is less than 50% of the concrete storage. Convenient operation, delivery rate of 95%.
C, the construction period is short, and it can be completed and used in 3-4 months.
D, good comprehensive performance, environmental protection, energy saving, land saving, long service life, and can be used for 50 years.
E, the fourth generation steel silo is the only one in China, with more advanced technology, higher emptying rate, better homogenization effect and convenient maintenance and replacement of equipment in the silo. After years of practice and a lot of experimental research and improvement, the fourth-generation warehouse adopts multi-point discharge and matching discharge, which completely solves the technical problems of the first, second and third-generation large-diameter floor-standing warehouses, such as excessive storage, low discharge rate, poor homogenization effect and inability to repair and replace the equipment in the warehouse.
Comparison between traditional concrete warehouse and large steel plate warehouse
Large steel plate warehouse is a new patented technology that breaks through the traditional concept of building warehouse and adapts to various geological and meteorological conditions. Large-scale warehouse has the characteristics of large reserves, short construction period, low investment per ton warehouse, small floor space, simple transportation mode, few dust discharge points and self-homogenization. The construction of large steel plate warehouse can completely avoid many defects of traditional circular warehouse, which is not only suitable for the storage of bulk cement in different off-seasons, but also suitable for the storage of fly ash, slag powder and raw materials. That is, the clinker in the grinding station is pre-crushed to a maximum particle size of less than 2 mm and stored in a large steel plate warehouse. A large number of long-term storage can ensure no quality loss, reduce the construction area of clinker shed, reduce the investment of clinker storage facilities, and change many defects of dust pollution and waste of land resources. This patented technology can build a large steel plate warehouse with a reserve of 1 ~ 1 10,000 tons, and reasonably arrange the location, which not only simplifies the complicated links of warehousing and transportation, but also reduces the equipment investment and equipment maintenance costs, so that users can obtain greater economic benefits. Adopting a large steel plate warehouse can greatly reduce the investment cost and simplify the cumbersome loading and unloading transportation procedures; Taking the 20,000-ton steel plate warehouse as an example, it is equivalent to building 20 concrete silos with a capacity of 1000 tons and 4 concrete silos with a capacity of 5,000 tons. Compared with the investment cost, the total investment of 200 yuan to build a 20,000-ton large steel plate warehouse is no more than 4 million yuan. Build a traditional concrete silo with an investment of 300-400 yuan per ton. To build a 5000-ton storage tank, an investment of1.500-20,000 yuan is needed, and four 5000-ton storage tanks are built, with a total investment of 6-8 million yuan. After comparison, it can highlight the advantages of large steel plate storage.
The environmental protection effect of large steel plate warehouse can completely meet the requirements of dust-free emission. This function fully meets the policy requirements of the current "green" strategy. If a large steel plate warehouse is used in the production process, the storage and transportation links will show dust-free emission, pollution-free and harmless environmental protection effects. The core technology of large steel plate warehouse is foundation and layout. We use the principle of free floating without piles to design the foundation, and the shape of the foundation will change under different geological conditions. From the first generation to the present fourth generation, the emptying rate has increased from 75% to over 95%. The bottom gasification function of the warehouse can divide the materials stored in the warehouse into multiple locations, gasify them in different regions and mix them evenly. Materials will be discharged from the warehouse through the bottom channel, and the discharge amount can be set according to the needs of users. No matter how the user exports, it can be sent to the export device in a controlled way as needed. A large steel plate warehouse can guarantee its service life within 50 years as long as the outside of the warehouse does not rust.
Overview of large steel plate warehouse
After years of painstaking research and development, the concept of multifunctional large steel plate warehouse developed by our company is completely different from that of traditional bulk cement storage facilities. This is a new concept of multi-functional goods warehouse. There is no precedent in China and no relevant information abroad, and it belongs to a new warehouse that replaces the traditional bulk cement storage facilities. The popularization and application of multi-functional large-scale steel plate warehouse has completely solved a big problem of continuous production in off-season storage in cement enterprises, and has been deeply concerned and recognized by leaders, experts and engineers at all levels in the cement industry.
The technical core of the steel plate silo is the silo bottom foundation technology and discharging technology. The wedge-shaped supercharged foundation designed by our company according to the wedge-shaped supercharged principle is suitable for engineering construction carried out by various enterprises under different geological conditions, which saves 50% investment effect compared with the traditional pile foundation or raft foundation. Since our company designed and built the first 30,000-ton large steel plate warehouse in China in 2007, the fourth generation multifunctional large steel plate warehouse has been developed after a lot of experimental research and improvement. The fourth generation multifunctional large steel plate warehouse has made a breakthrough in discharging technology. Completely solved the technical problems of large-diameter floor-standing storage, such as more materials stored at the edge, low discharge rate, poor homogenization effect, and inability to repair and replace the equipment in the storage. After the application of many large enterprise groups, the multifunctional large steel plate library developed by our company has been widely recognized and praised by the industry. Practice has proved that the cement conveying rate can reach more than 95%, and there are more than 6 discharge points for homogenization discharge, and the homogenization index is >: 4. At the same time, the gasification equipment can be easily replaced and maintained when there are materials in the warehouse, which is difficult for other unloading systems in China at present.
In addition to the above advantages, the steel plate library also has the following functional characteristics:
I. Structural shape and size
The effective diameter of a large steel plate warehouse can reach more than ten meters to tens of meters, and the height-diameter ratio is generally around 1: 1. The bin body is cylindrical, and the top of the bin is round and spherical. The library wedge is welded by steel plates; The dome of hemispherical dome is a unique architectural structure formed by the structural design of section steel and the combination of multiple arched beams. Its reasonable architectural structure makes its dome have reliable bearing capacity. The shape of the reservoir bottom is concave, and the design parameters are different under different climatic conditions and geological structures by using the wedge pressurization principle.
2. Storage capacity and bulk density of materials: the capacity of a single warehouse is 6,543,800 tons.
The storage capacity of a single cement can be 1-65438+ 10,000 tons, and a cement storage group with a total storage capacity of several hundred thousand tons can be formed. Cement reserves are related to cement bulk density. The bulk density of the cement with large air content which is put into the silo through the chute is relatively small, generally around 1.2, and it can reach 1.4- 1.5 after a period of time, and 1.7 after a long time. Under normal circumstances, the storage bulk density of cement is calculated as 1.45.
Third, the warehousing of materials: both mechanical and pneumatic.
According to the different conditions of each factory, the material storage mode can be elevator storage, chute storage or pneumatic conveying pipeline storage. Bridges can be erected between the top of the silo and between the top of the silo and the frame of the hoist, so as to install the incoming material conveying equipment.
4. Transportation mode and flow rate: the gas discharge time can reach 500 tons.
The traditional silo discharging method generally adopts self-discharging, but with the long-term storage of cement, if there is no external force to promote it, the discharging rate is quite low, generally less than 70%. Because of the special gasification unloading device combining gas fluidization and pneumatic pipeline, the cement in the large steel silo is fluidized first, and stratified flow unloading occurs under the abnormal slope at the bottom of the silo, so even if the bottom area is large, the emptying rate can be guaranteed to be above 90%. When unloading, the cement will be sent out of the warehouse by the conveying pipeline, and sent to the packaging bin or bulk cement tank by lifting equipment or pneumatic conveying equipment. According to the customer's requirements for transportation flow, the transportation capacity of a single pipeline can reach 500T/H, and the combination of double pipes and multiple pipes can be used for larger flow to meet the customer's requirements.
5. Small gas consumption: Because the design concept of gas fluidization, gas homogenization and gas transportation integration is adopted in the warehouse, that is, the principle of multi-purpose in one gas can save a lot of gas sources. Considering the long storage period of cement and the increase of bulk density, high-pressure air is used as the gas source. The comprehensive power consumption for gas homogenization, unloading and transportation of tons of cement is about 0.3 degrees. If the cement is stored for too long, the power consumption will increase relatively.
Sixth, the quality effect of cement preservation: it will not deteriorate after storage for 2 years.
With the extension of storage period, the bulk density of cement increases. Cement is basically vacuum sealed in the airtight isolation of the large steel plate silo wall. This kind of sealing effect is much better than brick, stone and concrete structure, and the cement sealed in bags is incomparable. Practice has proved that the compressive strength of cement stored in large steel plate warehouse for more than two years is basically unchanged, except that the setting time is slightly prolonged and the flexural strength is slightly reduced, and there is no caking phenomenon.
Seven, environmental protection standards: a dust collector can achieve dust-free emissions.
The warehouse roof is a load-bearing dome, and each warehouse roof is equipped with a pulse vibration dust collector, which mainly collects the dust generated when materials are put into storage. Reduce the dust concentration to below 30mg/m3. If the traditional library is used, the number of dust collectors will increase and the investment in environmental protection will increase. For example, a large steel plate warehouse with 25,000 tons of cement has only one entrance, and one dust collector can ensure dust-free discharge, while a circular warehouse with 25 1000 tons of traditional structure needs 25 dust collectors, each of which needs 25 dust collectors, so it is very difficult to control environmental protection only by discharging dust from multiple entrances.
Eight, process layout: flexible and free.
According to the location of the site, it can be arranged in a straight line, triangle, double row or multiple rows, and the direction of the discharge corridor can be flexibly determined according to the site conditions. Because the pneumatic pipe is used for discharging, the position of the exit elevator can be freely selected. 、
Storage has a wide range of uses: various.
Our company has developed clinker and fly ash silos while promoting the application of large cement storage steel silos, which not only reduces investment, eliminates environmental pollution, but also saves a lot of construction land. At the same time, a special warehouse for grain and oil products has been developed.
X. short construction period: about 3 months.
According to geological conditions, construction site and construction environment, the construction period is generally 2.5-4 months. If it is a group of reservoirs, it can be constructed alternately or simultaneously to shorten the construction period.
XI。 Long service life: 30 years
Anti-corrosion maintenance according to the specifications can ensure a reliable service life of 30 years without obvious external corrosion.
12. Low maintenance cost: there is almost no maintenance cost for the discharging equipment in the warehouse.
The gasification, unloading and conveying equipment in the warehouse has no rotating parts and is basically maintenance-free. Even if the 20,000-ton cement silo is maintained once every three years and only painted with external antirust paint, the annual maintenance cost is only about 3,000 yuan.