Rotary air preheater dust-blocking-prevention synergy sealing method and system

Abstract

The invention discloses a rotary air preheater dust-blocking-prevention synergy sealing method and system. The dust-blocking-prevention synergy sealing method includes the steps that air leaked from the heat end is guided or extracted to the cold end from the heat end, and local heat exchange elements are purged and heated. The rotary air preheater dust-blocking-prevention synergy sealing system comprises a heat end primary air/smoke side sector sealing box, a heat end primary air/secondary air side sector sealing box and a cold end secondary air/smoke side sector sealing box, and further comprises a heat air leakage air flue; the heat end primary air/smoke side sector sealing box and the heat end primary air/secondary air side sector sealing box are each provided with an air inlet, one end of the heat air leakage air flue is in butt joint with the air inlets, and the other end of the heat air leakage air flue extends to a cold end secondary air highest-temperature module. By means of the rotary air preheater dust-blocking-prevention synergy sealing method and system, H2SO4 drops and liquid state NH4HSO4 are gasified while the air leaked from a preheater is reduced, and the aim of removing accumulated dust is achieved; the rotary air preheater dust-blocking-prevention synergy sealing method and system have the advantages of reducing the boiler smoke discharging temperature, restraining the accumulated dust of the preheater, reducing the air leakage rate, prolonging the service life of the heat exchange elements and the like.

Description

technical field [0001] The invention relates to a method and system for synergistic sealing of a rotary air preheater for anti-clogging and ash, and belongs to the fields of anti-dust accumulation of an air preheater and sealing of an air preheater. Background technique [0002] Rotary air preheater (referred to as "preheater") is a heat exchange equipment used in large-scale power plant boilers. It uses the heat of boiler flue gas to heat the air required for combustion, thereby improving the efficiency of the boiler. [0003] The focus of the preheater mainly includes dust blocking, high air leakage rate, low heat transfer efficiency, serious low temperature corrosion, etc. These problems will affect the safe and economical operation of the equipment for a long time. [0004] The above problems have a long history, and they promote and influence each other. In recent years, with the general operation of the denitrification system, the operating environment of the preheate...

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Problems solved by technology

[0016] In order to solve the defects of the preheater in the prior art such as dust blocking, high air leakage rate, low heat transfer efficiency, and serious low-temperature corrosion, the present invention provides a method for synergistic sealing of a rotary air preheater to prevent dust blocking and its system

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