Waste heat recovery system for preventing flue gas dew point corrosion

Abstract

The invention discloses a waste heat recovery system for preventing flue gas dew point corrosion. The waste heat recovery system comprises a steam generator, a steam heater, a combustion-supporting air preheater and a steam pocket. A flue gas side inlet of the steam heater is connected with a high-temperature flue gas pipe, a flue gas side outlet of the steam generator is connected with a low-temperature flue gas pipe, a flue gas side outlet of the steam heater is connected with a flue gas side inlet of the steam generator, a steam ascending pipe and a liquid down pipe are connected between the working medium side of the steam generator and the steam pocket, a low-temperature steam pipe is connected between the working medium side of the steam heater and the steam pocket, a flue gas side inlet and an outlet of the combustion-supporting air preheater are connected with a low-temperature air pipe and a high-temperature air pipe respectively, a high-temperature steam pipe is connected between the working medium side of the combustion-supporting air preheater and the working medium side of the steam heater, the working medium side of the combustion-supporting air preheater is connected with a frequency conversion vacuum pump, the working medium side of the combustion-supporting air preheater is connected with the steam pocket through a working medium pipe, and the working medium pipe is provided with a frequency conversion working medium pump.

Description

technical field [0001] The invention relates to a waste heat recovery system for preventing flue gas dew point corrosion, which can completely recover flue gas waste heat while ensuring that flue gas dew point corrosion does not occur, and belongs to the technical field of flue gas waste heat recovery. Background technique [0002] Smoke exhaust loss is very important in various industrial furnaces such as thermal power plant boilers, various heating furnaces in petroleum refining, ironmaking blast furnace hot blast furnaces, rail steel heating furnaces, coke ovens, nonferrous metallurgy, chemicals, fertilizers, ceramics, glass, etc. A heat loss, high exhaust gas temperature will affect the economy of operation. As the country pays more and more attention to energy saving and emission reduction, people pay more and more attention to waste heat utilization technology of flue gas. However, when the exhaust gas temperature is too low and the surface wall temperature of the exha...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a waste heat recovery system that prevents flue gas dew point corrosion, so as to solve the technical problems of high exhaust temperature and low system efficiency in the prior art flue gas waste heat recovery system

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