A: The so-called vacuum hot water boiler is also called vacuum phase change hot water boiler. Refers to the boiler that heats cold water through phase change heat exchange when the pressure of the medium inside the boiler is lower than atmospheric pressure during normal operation.
2. What is the structural principle of vacuum hot water boiler?
Answer: The vacuum hot water boiler body is divided into two parts, and the lower structure is similar to the three-return wet back steam boiler, that is, the heating surface composed of furnace liner and flue; The upper part is a vacuum chamber (negative pressure steam chamber), and a tubular steam-water heat exchanger is installed inside to heat the circulating water flowing through the heat exchanger. Working principle: When the vacuum hot water boiler is running, the heat medium water in the boiler absorbs the heat energy released by fuel combustion under vacuum negative pressure and boils and vaporizes into low-temperature steam. When the low-temperature steam rises, it meets the circulating water in the stainless steel heat exchanger, and the heated circulating water is sent to the user for heating or sanitary hot water. The water vapor itself is cooled, condensed into water droplets, falls on the surface of the heat medium, and is heated again to complete the whole cycle. Heat medium water circulates continuously in the closed body, so there is no need to replenish condensed water, and there is no danger of empty burning. Steam-water condensation heat transfer used in vacuum hot water boiler is the highest in all heat transfer conditions.
1. What is a vacuum hot water boiler?
A: The so-called vacuum hot water boiler is also called vacuum phase change hot water boiler. Refers to the boiler that heats cold water through phase change heat exchange when the pressure of the medium inside the boiler is lower than atmospheric pressure during normal operation.
2. What is the structural principle of vacuum hot water boiler?
Answer: The vacuum hot water boiler body is divided into two parts, and the lower structure is similar to the three-return wet back steam boiler, that is, the heating surface composed of furnace liner and flue; The upper part is a vacuum chamber (negative pressure steam chamber), and a tubular steam-water heat exchanger is installed inside to heat the circulating water flowing through the heat exchanger. Working principle: When the vacuum hot water boiler is running, the heat medium water in the boiler absorbs the heat energy released by fuel combustion under vacuum negative pressure and boils and vaporizes into low-temperature steam. When the low-temperature steam rises, it meets the circulating water in the stainless steel heat exchanger, and the heated circulating water is sent to the user for heating or sanitary hot water. The water vapor itself is cooled, condensed into water droplets, falls on the surface of the heat medium, and is heated again to complete the whole cycle. Heat medium water circulates continuously in the closed body, so there is no need to replenish condensed water, and there is no danger of empty burning. Steam-water condensation heat transfer used in vacuum hot water boiler is the highest in all heat transfer conditions.
3. What is a vacuum state?
Answer: The vacuum state does not mean that the absolute pressure is zero, as long as it is lower than the outside air pressure, it can be called "vacuum". For example, when the vacuum boiler is running, the boiler shell is evacuated by the vacuum device, and the pressure is maintained at about -0.03MPa, that is, the absolute pressure of the medium in the boiler is about 0.07MPa.
4. What is vacuum degree?
Answer: The vacuum degree refers to the degree to which the gas is diluted in a vacuum state, which is usually expressed by "high vacuum degree" and "low vacuum degree". High vacuum degree means "good" vacuum degree, and low vacuum degree means "poor" vacuum degree. The vacuum value indicates that the actual value of system pressure is lower than atmospheric pressure, that is, vacuum = atmospheric pressure-absolute pressure. International standard unit of vacuum degree: Pa.
5. Why is the heat medium water in the vacuum hot water boiler heated in vacuum?
A: The boiling temperature of water is different at different pressures. At an atmospheric pressure (0. 1Mpa), the boiling temperature of water is 100℃, while at a pressure of 0.8Kpa, the boiling temperature of water is 4℃. Vacuum hot water boiler works in the pressure range of 2.67 kPa ~ 66.6 kPa, and the corresponding saturation temperature is 15℃ ~ 85℃. Therefore, in the vacuum state, heat medium water is easy to boil and vaporize.
6. What is the origin of vacuum hot water boiler?
A: The basic principle of vacuum hot water boiler was born in 1972 Zurich University of Technology. 1975, TAKUMA Company of Japan developed a vacuum hot water boiler based on this principle and obtained an invention patent. Later, it gradually spread all over the world, but mainly in Asian countries. In Japan and South Korea, there are well-known vacuum boiler manufacturers, such as TAKUMA and Dong Qing. In the late 1980s, domestic manufacturers developed a vacuum hot water boiler, but due to technical problems, it was mainly unable to solve the problem that the electrochemical reaction between water and iron in the sealed vacuum state of the boiler led to the continuous decrease of vacuum degree, and it has not been popularized. In the late 1990s, domestic boiler manufacturers began to produce vacuum boilers.
7. What is the main difference between imported products and domestic products of vacuum hot water boilers?
A: The core difference lies in the difference of vacuum devices: imported products use vacuum pumps and their control systems to form and control vacuum, while domestic products use mechanical check valves to form and control vacuum.
8. What is the key technology of vacuum hot water boiler?
Answer: The key technology of vacuum boiler is to keep the vacuum degree stable for a long time and the leakage rate is extremely small.
9. How is the vacuum state of vacuum hot water boiler formed?
Answer: Air extraction method: The factory uses a special vacuum pump to forcibly extract the air from the closed tank of the vacuum boiler to form a vacuum state. Some manufacturers adopt the boiling method: firstly, add a certain amount of clean water into the boiler to a certain water level, close all other valves of the boiler except the exhaust valve, raise the temperature in the boiler to saturation temperature under the working pressure of heat medium water, and close the exhaust valve to form a vacuum state after all the air dissolved in the working medium is discharged.
10. What is the cause of vacuum damage?
Answer: When the vacuum hot water boiler leaves the factory, the inside of the boiler is in a vacuum state, but during the operation of the vacuum boiler, the vacuum degree will be destroyed due to the following reasons:
1. Furnace leakage: quality defects of welds, seals and steel products.
Second, the generation of non-condensable gas (unavoidable): The heat medium water reacts with the furnace body (steel plate), releasing a non-condensable gas (H2), which directly affects the vacuum degree of the vacuum boiler. However, the chemical reaction will also form a protective film (iron hydroxide) on the surface of steel plate, which will hinder the chemical reaction. According to experience, this chemical reaction will stop within 2~3 years of boiler operation.
1 1. How to prevent vacuum damage?
Answer: 1. It is very important to detect the process of furnace leakage. "Helium mass spectrometry leak detection" inspection is adopted in the production process of vacuum boiler, which mainly includes three types: parts leak detection (plug melting), semi-finished products leak detection (welding part of furnace body) and whole machine leak detection. High detection accuracy (helium molecular level), thorough detection and thorough prevention.
2. During the operation of vacuum boiler, non-condensable gas must be pumped out, which is called vacuumizing.
12. Why should vacuum be pumped during the operation of vacuum hot water boiler?
Answer: When non-condensable gas is produced in the vacuum boiler, the pressure will increase accordingly, which is called vacuum degree failure. Non-condensable gas produced in vacuum boiler seriously affects heat transfer efficiency. When the volume content of non-condensable gas reaches 0.2%, the thermal efficiency decreases by 20 ~ 30%, and the outlet water temperature does not increase, which reduces the boiler output. Therefore, the non-condensable gas must be pumped out when the vacuum boiler is running.
13. What is the most advanced vacuum maintenance method?
Answer: The most advanced vacuum maintenance method of vacuum hot water boiler is the patented technology of Japan TAKUMA (Tianxiong) Company-temperature difference automatic intelligent air extraction device, which is a fully intelligent automatic air extraction device. According to the need, the control system performs self-diagnosis and pumps air without manual control.
14. Temperature difference automatic air extraction device?
Answer: Non-condensable gas collection tank, vacuum check valve, three-way valve, two-way valve, vacuum pump, exhaust pipe, temperature sensor and control system. (See the drawing on the first page).
15. what is the working principle of the temperature difference automatic pumping device?
Answer: Working principle: When non-condensable gas is generated inside the unit, non-condensable gas (hydrogen) gradually gathers in the gas collecting tank during operation. Because the non-condensable gas does not participate in heat exchange, the temperature of the gas collecting tank drops slowly. When the temperature difference between the gas collecting tank temperature and the heat medium water temperature reaches 65438 00 degrees, the control system issues an air pump operation instruction. When the non-condensable gas is pumped away, the negative pressure steam reaches the gas collecting tank, the temperature of the gas collecting tank rises, and the temperature difference becomes smaller. The control system sends an instruction to stop the operation of the air pumping pump, and the air pumping pump stops running.
16. What is heat medium water?
Answer: Heat medium water is a kind of clean water specially purified, deoxygenated and softened by the manufacturer. Pour it at one time during production and recycle it during operation. Generally, there is no special case where water is not needed.
17. What is the material of the heat exchanger of the vacuum hot water boiler?
Answer: The heat exchanger in the boiler adopts SUS304 stainless steel tube. The tube is not easy to scale, has high heat transfer efficiency, does not rust, and is superior to ordinary heat exchange tubes in terms of water quality and flow restriction.
18. What are the main features of vacuum hot water boiler?
Answer: ① You don't need to install monitoring, but you can use it after installation; (2) one machine has multiple functions, saving investment; ③ No corrosion, crack, scar and tube explosion, and long service life; (4) high efficiency and energy saving, and low operation and management cost; ⑤. High safety performance.
19. What is the national regulatory policy on vacuum boilers?
A: In May 2002, the General Administration of Quality Supervision, Inspection and Quarantine issued the document Guo Han No.288, which clearly stipulated the use of vacuum boilers: because the pressure of the medium circulation system of vacuum phase change boilers is lower than atmospheric pressure, no explosion accident will occur. The manufacturing enterprise shall manufacture the vacuum phase change boiler according to the standard, and bear the legal responsibility of informing users (including boiler installers) to use it safely and ensuring that the boiler system is always in a vacuum state when in use. The installation unit of vacuum phase change boiler is responsible for the installation quality that meets the installation requirements of manufacturing enterprises. Vacuum phase change boilers that meet the above requirements do not need to be confirmed by the boiler and pressure vessel safety supervision agency of the administrative department of quality and technical supervision after installation, nor do they need to go through the use registration procedures.
20. Does the vacuum hot water boiler need annual inspection within the service life, and does the user need to pay the inspection fee every year?
Answer: There is no need for installation, inspection, boiler room project establishment and annual inspection (the annual inspection fee has been paid).
2 1. How can a vacuum boiler supply heating hot water and domestic hot water at the same time?
Answer: A vacuum hot water boiler with a heat exchange coil can provide heating hot water and domestic hot water at the same time. However, heating is a relatively stable load due to continuous operation, while hot water supply is intermittent, which is a greatly changing load. In order to meet the operation of domestic hot water supply, the bypass mode is generally adopted on the heating circulating water pipe. Or add a storage tank for domestic hot water.
22. Is the investment of vacuum hot water boiler large?
Answer: Although the main unit price of vacuum boiler is higher than that of ordinary hot water boiler, the use of vacuum hot water boiler can save a lot of investment in auxiliary equipment: plate heat exchanger, volumetric heat exchanger, primary circulating pump, soft water treatment equipment, expansion water tank, etc. , and can also save the corresponding pipeline installation fee, auxiliary power capacity increase fee, system control fee, etc. And the comprehensive investment is still lower than that of ordinary hot water boiler system.
23. What is the return on investment?
Answer: Because the normal service life of vacuum hot water boiler is more than twice that of ordinary hot water boiler (reaching semi-permanent life), the investment payback period is long and the depreciation rate of equipment is low, which is suitable for customers who need long-term use.
24. Why is the service life of vacuum hot water boiler more than twice that of traditional boiler?
Answer: The traditional boiler has its own fatal weakness, which determines its short service life. In order to solve the fatal weakness that affects the life of traditional boilers, vacuum hot water boilers are sealed with high-purity heat medium water, which is not in contact with air and will never be corroded by oxygen. The boiler heats the external hot water through the heat exchanger, and the furnace and flue only contact with the heat medium water, thus completely eliminating the generation of scale and maintaining efficient operation for many years; The circulating backwater of the system is not mixed with the heat medium water in the boiler, so the flue gas is stable and there is no condensed water, which completely solves the condensation corrosion phenomenon and greatly prolongs the service life of the boiler. The life of vacuum hot water boiler is more than 20 years.
25. What is the fatal weakness of the traditional hot water boiler?
A: At present, most of the boilers used for heating and hot water in China are still traditional hot water boilers (atmospheric or pressurized hot water boilers), but their service life is often short, and some of them are scrapped after three to five years of use. The reason is not the manufacturing quality of the boiler itself, but the inevitable corrosion and scaling in use:
① Oxygen corrosion: If there are no protective measures during the construction and shutdown of traditional boilers, the atmosphere will invade the boilers. Because the atmosphere contains oxygen and water. Leading to oxygen corrosion. Pits caused by oxygen corrosion will accelerate corrosion in the later operation; During the whole system downtime. Especially, if there are residues and water residue on the surface of the parts prone to water accumulation, the corrosion will be more serious than during normal operation.
② Backwater condensation corrosion: The backwater temperature of heating cycle in northern China is designed to be 75℃, but it is often 50℃ or even lower in actual use. At this time, the water vapor in the flue gas will condense into liquid water, which will be mixed with SO2 and NOX produced by combustion to form strong acid, which will seriously corrode the chimney, smoke chamber and flue pipe. The red rust water flowing out of the smoke chamber behind the boiler is produced by corrosion. This kind of corrosion is no exception even for imported boilers, and it will rot in about three years.
③ Furnace and flue scaling: Many hot water boilers directly heat external hot water, and the water quality directly affects the boiler life. After the hot water is heated, the scale will be deposited on the furnace and flue one by one, which will increase the heat transfer resistance and reduce the boiler efficiency. When the scale accumulates to a certain extent, it will burn through the furnace and flue, leading to boiler scrapping.
26. Is the water quality requirement of vacuum hot water boiler the same as that of traditional boiler?
A: On the contrary, the requirements of vacuum hot water boiler system for water quality are not as strict as those of traditional boilers. The vacuum hot water boiler adopts corrosion-resistant stainless steel heat exchanger, which has low requirements for water quality.
27. Why can vacuum boilers save energy?
Answer: ① Radiation heat loss: The furnace body is a sealed vacuum container, with good thermal insulation performance and small radiation heat loss. ② Heat transfer efficiency: The thermal efficiency of steam-water heat exchanger in the furnace body is 10 times that of water-water heat exchanger. ③ Thermal inertia and low load performance: The boiler is small in size, and the water quantity and heat capacity of the heat medium are small, so the thermal inertia is small and it is sensitive to load changes. After the boiler is turned on, there will be hot water in 5 ~ 8 minutes. ④ No scaling-energy saving
28. Why does the vacuum hot water boiler never explode?
A: The vacuum hot water boiler will never explode. The furnace works in a vacuum, not as a pressure vessel; The furnace body is sealed with a certain amount of heat medium water, which will not burn out in any state; The machine body is equipped with multiple self-protection devices (anti-overheating, anti-freezing, insufficient waterproof grade, anti-overpressure, anti-impact, anti-gas and fuel supply shortage, etc.). ).
29. Does the vacuum hot water boiler save floor space?
Answer: The vacuum hot water boiler adopts high-load combustion mode, with shortened combustion chamber length, compact structure, obviously smaller body volume and convenient product handling and installation. Multiple units can be installed side by side, occupying a small area; The reduction of boiler auxiliary equipment reduces the floor space of auxiliary equipment, thus saving the floor space of boiler room as a whole. Compared with the traditional boiler room, the vacuum hot water boiler room saves 30-50% of the floor space.
30. Is it necessary to increase the tonnage of vacuum hot water boiler compared with traditional boiler?
A: No, both vacuum hot water boilers and traditional hot water boilers are heat source supply equipment to provide heat. The output (tonnage) of the boiler is the ability of the boiler to provide heat in unit time. Regardless of the traditional boiler or vacuum boiler, the tonnage chosen is the same relative to the same load demand.
3 1. What are the disadvantages of vacuum hot water boiler?
A: It is impossible to provide hot water above 90℃.
32. Is the vacuum hot water boiler suitable for radiator heating system?
Answer: The design temperature of heat medium of radiator hot water heating system is generally determined according to the requirements of thermal comfort, the safety and economy of system operation. The water supply temperature shall not exceed 95℃, which can ensure that the heat medium will not vaporize under normal pressure. In the past, the temperature of supply and return water was often 95℃/70℃. However, in recent years, according to the advanced experience of heating at home and abroad, reducing the temperature of heat medium properly is conducive to improving comfort, so 80/60℃ is often used. When designing radiator heating system, vacuum hot water boiler meets the requirement of inlet and outlet water temperature of 80/60℃. At present, even if the design water temperature is 95/70℃, when the design outdoor temperature is reached, the design indoor temperature can be guaranteed as long as the running water temperature is around 70/55℃. Because the main factors that determine the efficiency of the heat sink are the heat dissipation area of the heat sink and the flow velocity of the medium inside the heat sink (which has little to do with the temperature of the medium), the same circulating water and the same temperature difference will take away the same heat. The difference between vacuum hot water boiler and traditional boiler (95/70℃) in radiator heating system is mainly because the heating time of room is 4 ~ 5 minutes slower than that of traditional boiler.
33. Is the vacuum hot water boiler suitable for air conditioning heating system?
Answer: In the traditional central air conditioning system, the water chiller refueling (gas) hot water boiler is the preferred cold and heat source scheme. In summer, centrifugal (screw) chillers are used to provide 7? C~ 12？ C cold water, using oil (gas) hot water boiler to provide 50? C~60？ C's hot water vacuum hot water boiler is indirectly heated by negative pressure steam, so the heat exchanger can withstand the high water pressure of the system. Therefore, the vacuum hot water boiler can be widely used in large and medium-sized air conditioning projects as a heat source in winter, and it has certain advantages in reconstruction projects.
34. The understanding of vacuum hot water boiler in fire protection design?
Answer: Because of the particularity of the working principle of vacuum hot water boiler, its body is similar to the evaporation coil in heat exchanger, air processor or refrigeration unit. Only the fuel delivery system (oil storage tank, daily fuel tank, oil pipeline system or gas pipeline system) should be designed according to the requirements of fire protection design, but the position of vacuum hot water boiler in the machine room, the design of vacuum hot water boiler system in the machine room and the fire protection design should be recognized.
35. Where can the vacuum hot water boiler room be built in the building?
Answer: The vacuum hot water boiler can be placed in the basement, semi-basement, or the first floor and roof to fully meet the needs of users on different occasions.
36. What is the fuel of the vacuum hot water boiler?
Answer: The main fuels are oil (light diesel or heavy oil) and gas (natural gas, city gas and liquefied petroleum gas).
37. What is the combustion equipment of vacuum hot water boiler?
Answer: The vacuum hot water boiler is suitable for all kinds of combustion equipment, and can be equipped with advanced integral burners as required, such as Weisuo imported from Germany, Black & Decker and Liyalu from Italy. The flame shape of the integral burner is adjustable, which is suitable for any boiler and has little requirement on the size of the combustion chamber. At the same time, because the combustion cylinder and the combustion head are slender, the diameter of the flame stabilizing disc is very small, the pressure behind the disc is high, and the flame leaves the flame stabilizing disc, so the heating load is small and the service life is long. The suction port of the burner combustion-supporting fan is suspended, and the inhaled air is clean, which is beneficial to full combustion. The flange of the combustion cylinder is movable, which is convenient for adjusting the installation depth. At the same time, the blower and the combustion cylinder are integrated, and the combustion noise is small. And its accessories have strong versatility.
38. Generation and prevention of boiler combustion noise?
Answer: The combustion noise mainly comes from the combustion noise of burner motor, blower and combustion chamber. With the increase of boiler output (tonnage), the noise value increases, which has little to do with the boiler heat exchange mode. There are other noise-making equipment (pumps, etc.). ) In the boiler room. Therefore, the noise of boiler room needs to be prevented as a whole, and the noise reduction methods are: burner (motor, fan, etc. ) with muffler and vibration damping accessories, flue with fan, wall with sound-absorbing board, and sound-proof door, etc. , to ensure that the field boundary noise index is up to standard.
39. Why is the operating cost of vacuum hot water boiler low?
Answer: (1) The auxiliary equipment of the vacuum hot water boiler is reduced, which directly reduces the operating expenses such as power consumption and maintenance costs.
⑵ The heat exchanger of the vacuum hot water boiler is built-in, and the boiler body does not scale and the thermal efficiency does not decay.
(3) The vacuum hot water boiler has a built-in heat exchanger to directly heat the circulating water of the system. The boiler is small in volume, small in heat medium water and small in heat capacity, so the thermal inertia is small and the partial load operation efficiency is high, while 70% of the operation time of the boiler is under 50% ~ 75% load. Therefore, when the vacuum hot water boiler is used, the operating cost is greatly reduced.
(4) The thermal efficiency of the vacuum hot water boiler is 91%; The thermal efficiency of traditional boiler is about 90%, and the efficiency of plate heat exchanger is about 94%. The total efficiency of the primary and secondary heat exchange systems for heating is 90%×94%=84.6%. Therefore, compared with the primary and secondary system of plate heat exchanger of traditional hot water boiler, the overall thermal efficiency of vacuum hot water boiler is improved by 6-7%, and the fuel cost is reduced due to the improvement of efficiency, thus saving the operation cost.
40. How to identify the thermal efficiency of vacuum hot water boiler?
Answer: The thermal efficiency of a boiler refers to the percentage of effective heat in the heat emitted by fuel. Most of the heat sent by the fuel into the boiler is absorbed by the heating surface of the boiler, producing water vapor. This is the effective heat used. The other part of the heat is lost, which is called heat loss. The vacuum hot water boiler runs at rated efficiency, and the exhaust temperature is 185℃, which is better than the national standard below 220℃, indicating that the heat of fuel combustion is absorbed by the circulating water of the system, and the thermal efficiency is higher than the national standard (87-88%).
4 1. What is the operating cost of vacuum hot water boiler in winter?
Answer: The operating cost of vacuum hot water boiler is related to system function, load, heating area and service time. Taking Beijing as an example, the theoretical operating cost of radiator heating in a heating season is about 18.02 yuan /m2 according to the average calorific value of 8500kcal/Nm3 after gas is delivered to the home. According to the actual engineering statistics, the operating cost of a heating season is about 17 yuan /m2.
42. Is the vacuum hot water boiler easy to operate?
Answer: Boiler operators do not need to work with certificates. The boiler control panel adopts touch operation function, which is convenient for operation. The machine body is equipped with multiple self-protection devices (anti-overheating, anti-freezing, insufficient waterproof grade, anti-overpressure, anti-impact, and anti-gas fuel supply shortage, etc.). ) to fully prevent machine failure.
43. How to ensure the safe operation of vacuum hot water boiler?
Answer: The vacuum hot water boiler is equipped with six safety protection devices to ensure the safe and stable operation of the boiler. Safety control devices specifically include electrical protection devices, physical protection devices and destructive protection devices.
⑴ Electrical protection device: ① combustion safety control device, ② heat medium water temperature control device, which can control the temperature and water level of heat medium water in the furnace body, and ③ pressure switch, which really acts when the pressure in the furnace body rises abnormally and automatically stops combustion.
⑵ Physical protection device: ① Overheating fuse. It does melt below 96℃, and the combustion stops automatically. ②. Low water level temperature fuse. When the heat medium water level in the furnace body is too low, which causes the temperature to rise, the low water level temperature fuse is prevented from blowing, and the combustion is automatically stopped.
⑶ Destructive protection device: the dissolving plug can really dissolve below 98℃, and release the steam in the furnace body to the atmosphere, so that the furnace body is free from abnormal pressure. The destructive protection device ensures that when all electronic safety devices fail, the device will never explode.
44. Can the vacuum hot water boiler realize remote control and network control?
Answer: The vacuum hot water boiler is equipped with remote monitoring port and remote and network controller, which can control the boiler remotely and through network operation. When multiple boilers are installed and used at the same time, the group control controller is combined to realize the group control and centralized management of all boilers, and the number of started boilers is automatically controlled according to the load change by using the climate compensation function.
45. Will burning produce carbon deposit? How to clean up carbon deposits?
Answer: When fuel oil is burned as fuel, it will produce carbon deposit; Gas is combustible and produces little carbon deposit, but it is also necessary to clean up the carbon deposit of gas-fired boilers every year. The flue gas flow of Dong Qing vacuum hot water boiler consists of a furnace and two flue gas return paths. The space of the furnace can accommodate maintenance personnel to carry out cleaning operations inside; The flue gas loop consists of a threaded flue pipe. After opening the front cover plate of the flue gas box and the rear cover plate of the maintenance flange, the steel brush can be used for convenient cleaning.
46. How to express the output of vacuum hot water boiler?
Answer: There are three expressions of boiler output, namely Kcal/h, t/h and MW.
(1) Calories/hour are expressed in metric units, indicating the heat provided by the hot water boiler per hour.
⑵ "Ton" or "Steaming Ton" is a popular term borrowed from steam boilers, which refers to the heat provided by hot water boilers per hour, which is equivalent to the heat absorbed by heating a certain mass (usually expressed in tons) of water from 20℃ and vaporizing it into steam.
(3) MW is the unit of power in the international system of units, and the basic unit is W( 1MW= 106W). This expression should be used in official documents.
The conversion relationship of the three expressions is as follows: 600,000 kcal/hour ≈ 1 steam ton/hour ≈0.7MW.
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