System and method for reducing low-temperature corrosion of boiler smoke exhaust temperature inhibition air preheater

Abstract

The invention discloses a system and a method for reducing the low-temperature corrosion of a boiler smoke exhaust temperature inhibition air preheater, and relates to the field of comprehensive optimization of power station boiler auxiliary machine systems. The system comprises a branch air supply system which communicates with a main flue gas cooling system; the branch air supply system comprises a branch air supply fan, an air blowing port of a branch air blower communicates with the other inlet of a heat exchanger through a branch cold secondary air duct, the other outlet of the heat exchanger communicates with the main flue gas cooling system through a branch heat secondary air flue, and the branch air blower communicates with an inlet air box of the branch air blower through an inletair flue of the branch air blower. The system comprises a cold secondary hot air duct communicating between a branch heat secondary air duct and a secondary air system. The branch air blower communicates between the cold secondary hot air duct and the branch air blower inlet air duct of a branch air blower of the branch air supply system. The device comprises a primary air re-hot air duct communicating between a branch hot air duct and a primary air system. According to the system, the problems of high smoke discharge temperature of a boiler, low temperature corrosion of the air pre-heater and low boiler efficiency are solved.

Description

Technical field [0001] The invention relates to the field of comprehensive optimization of power station boiler auxiliary equipment systems, in particular to a system and process method for reducing boiler exhaust gas temperature and inhibiting low-temperature corrosion of air preheaters. Background technique [0002] The operating conditions of coal-fired power plant boilers are complex, and the quality of coal-fired power plants is complex and changeable. At present, the problem of high exhaust gas temperature of boilers is widespread. In recent years, as the requirements for energy conservation and emission reduction have become stricter, how to effectively reduce the exhaust gas temperature and improve the thermal efficiency of coal-fired power plants is particularly important. [0003] There are many reasons for the high exhaust gas temperature of the boiler, which are caused by operation control and auxiliary equipment failure, and also caused by uncontrollable factors such a...

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Problems solved by technology

[0006] The purpose of the present invention is to provide a system and process method for reducing boiler exhaust gas temperature and suppressing low temperature corrosion of air preheater, to solve the problems of high boiler exhaust temperature, low temperature corrosion of air preheater and low boiler efficiency

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