Step recycling method for flue gas waste heat of household garbage incineration boiler

Abstract

The invention discloses a stepped recycling method for flue gas waste heat of a household garbage incineration boiler. The problem that how to deeply recycle the flue gas waste heat of an existing household garbage incineration power plant in a stepped mode is solved. A flue gas-water heat exchanger and a gas-water direct contact type heat exchanger are adopted, high-temperature and high-humidity flue gas exhausted by a flue gas purification system of a household garbage incineration boiler is subjected to step two-time heat exchange cooling, and the temperature of the flue gas is reduced to 20-30 DEG C from 140-150 DEG C; a heat user, a heat pump or a cooling tower system, a water-water heat exchanger and a flue gas-water heat exchanger form an outer circulating water heat exchange closed-loop system, and the water-water heat exchanger and a deep wet cooling heat exchanger form an inner circulating water heat exchange closed-loop system. After absorbing heat of flue gas in the gas-water direct contact type heat exchanger, internal circulating water of the internal circulating water heat exchange closed-loop system exchanges heat with cooling water from a heat pump and is primarily heated by the cooling water, so that the requirement is met, and the heat utilization of secondary energy is improved.

Description

technical field [0001] The invention relates to a method for recovering and utilizing waste heat of flue gas produced by garbage incineration, in particular to a method for recovering and utilizing stepwise depth of waste heat of flue gas produced by a domestic waste incineration boiler. Background technique [0002] The flue gas discharged from the boiler that incinerates domestic waste needs to be treated by a series of flue gas purification systems. The flue gas after treatment has the characteristics of high temperature and high humidity, and the volume fraction of water vapor in the exhaust flue gas can reach 15%-40%. , the final exhaust gas temperature is also as high as 140°C-150°C; at present, waste incineration plants directly process the flue gas generated by incinerating garbage and then discharge it into the atmosphere. There is a serious problem of energy waste; in addition, due to the difference in the quality of incinerated waste, the flue gas discharged from ...

AI Technical Summary

Problems solved by technology

[0003] The present invention provides a cascade recycling method for flue gas waste heat of domestic waste incineration boilers, which solves the technical problem of how to deeply recycle the flue gas waste heat of existing domestic waste incineration power plants

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