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HomeNewsThe Function Of Boiler Economizer

The Function Of Boiler Economizer

2021-06-17
The first function is to increase the temperature of the feed water, and the boiling economizer can also generate a small amount of steam. The feed water entering the economizer comes from the deaerator. The water temperature of the low-pressure deaerator is generally 104°C, and the water temperature of the high-pressure deaerator is about 158°C. The saturation temperature of the medium-pressure furnace (4.4Mpa) is about 256°C, and the saturation temperature of the high-pressure furnace (11 Mpa) is 317°C, which is much higher than the temperature of deoxygenated water. If there is no economizer and the feed water directly enters the steam drum, because the water entering the downcomer is too hot, a large part of the heating surface of the water wall is used to increase the water temperature, and the heating surface used to generate steam is reduced, so that the boiler evaporates The amount is reduced. After installing the economizer, the water temperature can be significantly increased. For the boiling economizer, the water temperature can be increased to the saturation temperature under the boiler pressure, and a small amount of steam can be generated (about 10% to 20% of the boiler's evaporation capacity). When the water is fed into the water wall to absorb heat, it can be vaporized, and the boiler's evaporation capacity is significantly increased.

The second function is to reduce the temperature of the flue gas, recover the heat of the flue gas, improve the thermal efficiency of the boiler, and save fuel. The temperature of the flue gas at the outlet of the superheater is about 700℃. Even if a large number of convection tube bundles are arranged behind the superheater, the temperature of the flue gas leaving the convection tube bundle is still as high as 250-350℃, and the temperature of the flue gas leaving the convection tube bundle is still as high as 250-350℃. Contains a lot of calories. Installing an economizer after the superheater or convection tube bundle can effectively reduce the flue gas temperature, recover a lot of heat, and save a lot of fuel. Because the early boilers usually used coal as fuel, they were called economizers.
HomeNewsThe Function Of Boiler Economizer

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