Method for protecting air preheater against blockage by adoption of compressed-air pulse ash blowing

Abstract

The invention discloses a method for protecting an air preheater against blockage by adoption of compressed-air pulse ash blowing, and belongs to the technical field of new energy and energy conservation. The method is applicable to a thermal power generator set. According to the method disclosed by the invention, a pulse ash blowing channel is reserved between a hot-section heat exchange elementand a cold-section heat exchange element of the rotary air preheater; a compressed-air pulse ash blowing device is arranged corresponding to the inlet of the pulse ash blowing channel; and through thepulse air blowing action of compressed air in the pulse ash blowing channel, the problem that the ash blowing effect on the middle of a heat transfer element is pool when the steam ash blowing operation is performed from the cold-section heat exchange element and the hot-section heat exchange element can be solved, the blockage of the rotary air preheater can be relieved, and the electricity consumption of boiler auxiliary equipment can be greatly lowered.

Description

technical field [0001] The invention relates to a method for preventing blockage of an air preheater by using compressed air pulse soot blowing, belongs to the technical field of new energy and energy saving, and is suitable for thermal power generating sets. Background technique [0002] Thermal power plants are equipped with air preheaters in order to reduce exhaust gas temperature, improve boiler efficiency and increase combustion air temperature. Rotary air preheaters are widely used in units with a unit capacity of 300MW or more. The advantages are small metal consumption, strong heat transfer capacity, and easy soot blowing and water washing during operation; the disadvantages are large air leakage rate and serious blockage. For example, the application number is 201720509389.1 China Patent. In recent years, due to environmental protection requirements, after the ammonia denitrification system was put into use, the air preheater was seriously blocked, especially for u...

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Problems solved by technology

[0003] The purpose of the present invention is to overcome the above-mentioned deficiencies in the prior art, and to provide a method for preventing the clogging of the air preheater by using compressed air pulse soot blowing device. , to purge the area where the steam soot blower cannot effectively purge, and solve the problems in the prior art such as serious blockage of the air preheater, large resistance, large air leakage rate, high power consumption of auxiliary machines, and high exhaust gas temperature of the boiler.

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