A coal-fired boiler flue gas secondary recovery oxygen control flame retardant system

Abstract

The invention belongs to the technical field of coal boiler flue gas emitting, in particular to an oxygen control and flame retardant system for secondary recycling coal boiler flue gas. The system comprises a coal-fired boiler, a warm-air pipe, a coal dryer, an exhaust duct, a gas exhausting chimney and a waste recovery pipe, wherein the exhaust emission mouth of the coal-fired boiler is connected to the air inlet of the coal dryer by the warm-air pipe, and the air outlet of the coal dryer is connected with the bottom mouth of the gas exhausting chimney by the exhaust pipe. And the gas exhausting chimney is provided with an electronic butterfly valve b, and an exhaust gas recycling mouth under the electronic butterfly valve b is placed on the side wall of the gas exhausting chimney, and the exhaust gas recycling pipe is connected with a furnace of the coal-fired boiler by the exhaust gas recycling pipe. The system realizes the oxygen control mode through taking back the CO2 recycling from the flue gas of the coal-fired boilers to the coal boiler, thereby preventing oxygen from entering the furnace to reduce the burning degree of the coal. Namely, there is no need to reduce coal and add slag. In this way, the workloads are reduced and the labor costs are saved.

Description

technical field [0001] The invention belongs to the technical field of coal-fired boiler discharge, in particular to a coal-fired boiler flue gas secondary recovery control oxygen flame retardant system. Background technique [0002] The flue gas produced by the combustion of ordinary coal-fired boilers is directly discharged into the atmosphere, and most of them do not have a dust collector device, which brings new pollution sources and emissions to the environment. Ordinary coal-fired boilers generally adopt the following measures to control the combustion temperature: (1) reduce the amount of coal supplied and the air supply of the fan to reduce the combustion temperature; (2) add a certain proportion of waste furnace slag to reduce the proportion of coal fired , to achieve the effect of sealing the furnace, which in turn causes the temperature to drop. No matter what kind of cooling method, the purpose is to destroy the good combustion state, so that the coal cannot con...

AI Technical Summary

Problems solved by technology

To solve the waste caused by the existing technology in reducing the degree of coal combustion and the serious impact on the system temperature.

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