Thermoelectric power generation system of boiler slag bucket heat source

Abstract

The invention belongs to the technical field of semiconductor thermoelectric power generation using a low-grade heat source, and particularly relates to a thermoelectric power generation system of a boiler slag bucket heat source. The system is formed by combining a steam-water type semiconductor thermoelectric generator and an organic working medium type semiconductor thermoelectric generator, alow-temperature side cold source is provided for cooling water supply of a slag hopper shared by steps, a two-stage heat storage mode is adopted, and a slag hopper coke slag heat source is used for thermoelectric power generation; wherein the high-temperature side heat source of the steam-water type semiconductor thermoelectric generator is 95-160 DEG C, the high-temperature side heat source of the organic working medium type semiconductor thermoelectric generator is 85-150 DEG C, the low-temperature sides of the steam-water type semiconductor thermoelectric generator and the organic working medium type semiconductor thermoelectric generator are cooled by adopting a slag hopper cooling water source, and the temperature range is 1-30 DEG C; the critical temperature range of an organic working medium selected by the organic working medium type semiconductor thermoelectric generator is 35-140 DEG C. The coke residue waste heat power generation efficiency is improved, the cooling water amount is saved, and the remarkable energy conservation and emission reduction effects are achieved.

Description

technical field [0001] The invention belongs to the technical field of semiconductor thermoelectric power generation using a low-grade heat source, and in particular relates to a thermoelectric power generation system of a boiler slag hopper heat source. Background technique [0002] The coke slag of the boiler contains a large amount of waste heat, but the heat grade is low, the recovery efficiency is low, and the level of upgrading technology is low. There are also problems such as the use of spiral slag slag and slag discharge at a fixed speed and insufficient heat storage, which leads to difficulties in waste heat recovery. Especially in the case of burning coal gangue or blending coal slime, the amount of bottom slag is very large, and the sensible heat loss of bottom slag can reach more than 1%. [0003] At present, buried tube coolers and heat transfer oil heat accumulators are generally used for low-slag waste heat recovery of large pulverized coal boilers. However,...

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Problems solved by technology

[0006] The purpose of the present invention is to solve the problems of low boiler coke slag waste heat recovery efficiency, low recovery quality, easy failure of the water seal at the bottom of the furnace, deterioration of furnace combustion, and large amount of cooling water.

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