Ash cleaning device for thermal power plant low-pressure low-temperature economizer and operation method

Abstract

The invention discloses an ash cleaning device for a thermal power plant low-pressure low-temperature economizer. The ash cleaning device comprises an automatic retaining plate door, partitions and an electric regulating valve and is characterized in that the automatic retaining plate door is arranged at the flue inlet of the low-pressure low-temperature economizer and provided with a retaining plate door electric head, the electric regulating valve is arranged between the large connecting box and the small connecting box of the low-pressure low-temperature economizer, one partition is arranged between every two adjacent longitudinally arranged heat exchanging modules, the flue of the low-pressure low-temperature economizer is separated into m horizontal channels through the partitions, and the partitions are connected with the automatic retaining plate door when the automatic retaining plate door is closed completely. The ash cleaning device can effectively reduce the ash accumulation of the flue of the low-pressure low-temperature economizer when a boiler unit is in low-load operation, and the evenness of the flue smoothness of the low-pressure low-temperature economizer is increased. The invention further provides an operation method of the ash cleaning device. By the method, the resistance loss of the boiler unit can be lowered effectively, flue gas energy loss can be lowered, and a heat changing effect is enhanced.

Description

technical field [0001] The invention relates to an ash cleaning device and an operation method for low and low temperature economizers in thermal power plants, and belongs to the field of industrial flue gas purification and waste heat recovery of coal-fired power plant boilers and industrial boilers. Background technique [0002] Coal-fired power plant boilers have a large proportion of exhaust heat loss during operation, accounting for more than 50% of the total boiler heat loss. Some thermal power plants operate with exhaust gas temperatures that are often higher than the design value. Therefore, reducing the exhaust gas temperature of power plant boilers has important practical significance for energy saving and emission reduction. Under this background, low and low temperature economizers have been widely used. At present, low and low temperature economizers are often used to recover and reuse the waste heat of the discharged high temperature flue gas. The heat recovere...

AI Technical Summary

Problems solved by technology

[0005] At present, the operating load of most power plant boiler units in my country is relatively low. Therefore, the flue gas flow rate in the flue is lower than the design value of 9m / s, and the ability of the flue gas to carry fly ash is weakened, resulting in serious ash accumulation in this horizontal section, which directly affects the economy and performance of the boiler. safety

So far, there has been no reasonable solution to the serious problem of low-load ash accumulation in the low-low temperature economizer system

The main equipment of the system includes: warehouse pump, air compressor, air compression tank, gasification fan, ash unloading system, ash hopper heater, steam system, etc.; the system is relatively complex, costly and occupies a large area

Images