Novel ash removing device and method for low-low-temperature coal economizer

Abstract

The invention relates to a novel ash removing device and method for a low-low-temperature coal economizer, and belongs to the field of industrial flue gas purification and waste heat recovery of coal-fired power station boilers, industrial boilers and the like. The ash removing device comprises ash removing main tubes, ash removing nozzles, ash removing branch tubes, branch tube valves and main tube valves, one ends of the plurality of ash removing branch tubes are connected with the ash removing main tubes, the main tube valves are arranged on the ash removing main tubes, the plurality of ashremoving nozzles with upward openings are further arranged on each ash removing branch tube, and each ash removing branch tube is provided with the corresponding branch tube valve. According to the novel ash removing device and method, in a system, the turbulence of the flue gas is adjusted by adopting the mode of opening and closing the branch tube valves and the main tube valves, the flue gas is in a suspended state through the air volume and the air pressure, dust cannot fall to a bottom plate of a flue, and the uniformity of the flue flow field of the section of the low-low-temperature coal economizer is improved. The invention further provides the novel ash removing method of the low-low-temperature coal economizer. The resistance loss of a boiler unit can be effectively reduced, theenergy loss of the flue gas can be reduced, and the heat exchange effect can be enhanced.

Description

technical field [0001] The invention relates to a novel ash cleaning device and method for a low-low temperature economizer, and belongs to the fields of industrial flue gas purification and waste heat recovery of coal-fired power station boilers, industrial boilers, and the like. 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 recovered by low and low temp...

AI Technical Summary

Problems solved by technology

At present, the operating load of most power plant boiler units in my country is low. Therefore, the flue gas flow rate in the flue is lower than the design value (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 of the boiler. sex and security

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

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