Primary air cooler heat recovery system and control method

Abstract

The invention discloses a primary air cooler heat regenerative system and a controlling method. According to the primary air cooler heat regenerative system and the controlling method, a primary air cooler is arranged in a primary heat air duct of an outlet of a boiler air heater, low-pressure supplied water used as cooling water is introduced by a coal-fired unit low-pressure water-supply heat regenerative system, heat of primary heat wind is absorbed, the heated supplied water is sent back to a unit deaerator, the flow of the cooling water is adjusted so as to enable the temperature of the primary wind to be reduced to meet the temperature requirement of drying medium at the inlet of a coal mill. By means of the technical scheme, the cold wind amount of a side road of a boiler air preheater can be greatly reduced, the smoke exhausting temperature of the boiler is reduced, the power-supply coal consumption of the unit is reduced, and the stable operation of the unit is not affected.

Description

technical field [0001] The invention relates to a coal-fired generating set technology using a medium-speed mill direct-blowing pulverizing system, in particular to a technology for reducing boiler exhaust gas temperature and reducing unit coal consumption in a coal-fired generating set. Background technique [0002] Since the operation of the coal mill and the pulverizing system is closely related to the operation of the boiler, its operation performance must consider the requirements of the boiler operation comprehensively, and the operation performance of the two affects and restricts each other. [0003] In most cases, the temperature of the hot primary air at the outlet of the air preheater is much higher than the required temperature of the drying medium at the inlet of the coal mill. The traditional medium-speed mill direct-blown pulverization system is based on the change of coal type and coal amount through cold and hot air. Different mixing ratios of the primary ai...

AI Technical Summary

Problems solved by technology

[0007] For the existing medium-speed mill direct-blown pulverization system, the inlet air temperature of the coal mill is adjusted by mixing cold and hot primary air, which bypasses part of the cold primary air and reduces the total amount of cold air passing through the preheater, making the The problem of boiler exhaust gas temperature rise The present invention provides a primary air cooler heat recovery system

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