System and method for reducing emission of oxynitride of combustion equipment

Abstract

The invention relates to a system for reducing emission of oxynitride of combustion equipment. The system comprises the combustion equipment with a burner and a flue. A gas flow adjusting valve is installed on a pipeline connecting the burner with a gas source. The flue is internally provided with a sensor used for detecting the concentration of gas components. An air inlet of the burner is connected with an air outlet of an air mixer in series. The air mixer is provided with two air inlets, one of the air inlets is connected with a combustion-supporting air pipeline with an air volume adjusting valve, the other air inlet is connected with a smoke gas returning pipeline with a smoke gas returning flow adjusting valve, the other end of the smoke gas returning pipeline is connected with the position, between the combustion equipment and the sensor, of the flue, and an air blower, the air volume adjusting valve, the smoke gas returning flow adjusting valve and the gas flow adjusting valve are controlled by a low-nitrate controller. The invention further relates to a method for reducing emission of the oxynitride of the combustion equipment. The problem that combustion is not stable in the operation process of an existing smoke gas outer circulation system is solved.

Description

technical field [0001] The invention relates to energy-saving and emission-reduction technologies for combustion systems, in particular to a system and method for reducing nitrogen oxide emissions from fuel and gas combustion equipment by utilizing flue gas external circulation technology. Background technique [0002] With the release of new standards for nitrogen oxide emissions in Beijing, the low-nitrogen combustion technology of combustion equipment and the technology for controlling nitrogen oxides have developed rapidly. At present, the main technologies used are divided into four categories: staged combustion, flue gas internal circulation, Premixed combustion, flue gas external circulation. Among them, staged combustion, flue gas internal circulation, and premixed combustion all need to replace the burner, and this method can be used for new combustion equipment. However, for the large number of combustion equipment currently in use, the limitation of the structure...

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Problems solved by technology

[0004] The object of the present invention is to provide a system for reducing the emission of nitrogen oxides from combustion equipment, which can realize the closed-loop control of the flue gas external circulation system; the present invention also provides a method for reducing the emission of nitrogen oxides from combustion equipment, which can solve the problem of The problem of unstable combustion caused by the fluctuation of nitrogen oxide emission value during the operation of the existing flue gas external circulation system and the fluctuation of the ratio of air and gas during the combustion process

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