Horizontal type chain grate heat medium heater capable of coupling side wall staging air and flue gas recirculation

Abstract

The invention discloses a horizontal type chain grate heat medium heater capable of coupling side wall staging air and smoke recirculation. The horizontal type chain grate heat medium heater is composed of a scraper coal feeder, a combustion chamber, a chain grate, a horizontal type heater body and a rear smoke channel. According to the horizontal type chain grate heat medium heater, staging air is distributed on the two side walls of the horizontal type chain grate heat medium heater, and meanwhile primary air is supplied in sections under the grate to build the staging combustion conditions in the heater; smoke is extracted from the position, between a waste heat boiler and an air preheater, of the rear smoke channel and fed into multiple primary chambers located on the front portion of the chain grate to organize smoke recycling. Accordingly, on one hand, the retention time of coal particles in the heater in a combustion state of being far away from the stoichiometric ratio is prolonged; on the other hand, in a coal seam combustion area, the oxygen concentration is diluted, the combustion temperature is lowered, the combustion intensity is weakened, therefore, the combustion process is delayed, and finally the low NOx combustion in the coal-fired horizontal type chain grate heat medium heater is achieved.

Description

Technical field

[0001] The invention relates to a coal-fired thermal medium furnace, in particular to a horizontal chain grate thermal medium furnace coupled with side wall classification air and flue gas recirculation, and belongs to the technical field of industrial boiler combustion. Background technique

[0002] The heat medium furnace is a kind of equipment that often uses the heat generated by the combustion of fuel to heat the organic heat carrier (ie, heat medium, also known as heat transfer oil). The heat medium is heated and transported to the heat-using equipment, and the heat is released and then returned through the circulating oil pump The heating in the heat medium furnace repeats this cycle to form a complete circulating heating system. Compared with traditional boilers that use steam to heat, thermal medium furnaces have the advantages of uniform heating, high temperature control accuracy and low operating pressure. Therefore, thermal medium furnaces are currentl...

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