Safe and energy-saving comprehensive utilization system for boiler

Abstract

The invention relates to a safe and energy-saving comprehensive utilization system for a boiler. The system comprises a flue gas heat release system, a waste heat utilization circular heat exchange system and a hot air heating system, wherein the flue gas heat release system comprises a flue from an air pre-heater to a desulfuration island; a fly ash separator, a heat exchanger, a dust remover, aninduced draft fan, a primary heat exchanger and a secondary heat exchanger are successively arranged in the flue in a flue gas flowing direction; the flue from the secondary heat exchanger to the desulfuration island is an acid etching preventing flue; the primary heat exchanger and the secondary heat exchanger are arranged in a slightly inclined manner; the waste heat utilization circular heat exchange system comprises a water supplementing water tank, a circulating pump of a steam-air heater, a primary heat exchanger at an outlet of the induced draft fan, a secondary heat exchanger at an outlet of the induced draft fan, a heat exchanger at an inlet of a dust remover, a primary heat exchanger at an inlet of a fan, a secondary heat exchanger at the inlet of the fan, a high-temperature cooler and a deaerator of a steam turbine. The hot air heating system comprises a blowing heating system and a primary air heating system. The safe and energy-saving comprehensive utilization system canachieve safe and energy-saving comprehensive utilization of the boiler.

Description

technical field [0001] The invention belongs to the technical field of thermal power generation, and in particular relates to a boiler safety and energy-saving comprehensive utilization system. Background technique [0002] Achieving boiler safety and economy is the goal pursued by boiler design, construction, operation and maintenance. There are often contradictions in the pursuit of ultimate safety and economy. Boiler heat loss is the main way of boilers. The main means of reducing boiler heat loss is to reduce Lowering the exhaust gas temperature will lead to blockage of the rotary air preheater by flue gas acid dew and ammonium bisulfate. The cooling of the gas brings a series of difficulties, ranging from the reduction of the waste heat utilization effect of the flue gas, to the reduced load operation of the unit, to the shutdown of the unit in severe cases. In order to reduce the wear of fly ash particles on the heating surface, eliminate the ammonium bisulfate blocka...

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Problems solved by technology

[0002] Achieving boiler safety and economy is the goal pursued by boiler design, construction, operation and maintenance. There are often contradictions in the pursuit of ultimate safety and economy. Boiler heat loss is the main way of boilers. The main means of reducing boiler heat loss is to reduce Lowering the exhaust gas temperature will lead to blockage of the rotary air preheater by flue gas acid dew and ammonium bisulfate. The cooling of the gas brings a series of difficulties, ranging from reduced flue gas waste heat utilization effect, moderately reduced load operation of the unit, and shut down of the unit in severe cases

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