Cyclone pulverized coal combustion device adopting smoke recirculation device and pre-combustion chamber

Abstract

The invention discloses a cyclone pulverized coal combustion device adopting a smoke recirculation device and a pre-combustion chamber, and relates to the field of industrial pulverized coal boiler combustion devices. The cyclone pulverized coal combustion device solves the problem that in the case of an existing industrial pulverized coal boiler, the NOx emission is large, slagging is serious, the combustible content of fly ash is high, and combustion stability is poor. The cyclone pulverized coal combustion device is characterized in that a cyclone pulverized coal combustor is connected witha boiler through the pre-combustion chamber, an inner-side smoke recirculation air pipe, an inner secondary air pipe, an outer-side smoke recirculation air pipe and an outer secondary air pipe are sequentially and coaxially arranged on a primary air pipe from inside to outside in a sleeving mode, and are internally provided with cyclones, an inlet of the inner-side smoke recirculation air pipe and an inlet of the outer-side smoke recirculation air pipe are connected with the recirculation smoke pipeline correspondingly, a recirculation fan is arranged at the inlet end of a recirculation smokepipeline, the inlet end of a separation secondary air nozzle is connected with the recirculation smoke pipeline and the outer secondary air pipe, and the outlet end of the separation secondary air nozzle is connected with the boiler. The cyclone pulverized coal combustion device is used for reinforcing staged combustion and reducing the concentration of nitric oxide.

Description

Technical field [0001] The invention relates to the field of industrial pulverized coal boiler combustion devices, in particular to a swirling pulverized coal combustion device adopting flue gas recirculation and a pre-combustion chamber. Background technique [0002] At present, my country's main coal-using equipment is concentrated in power station boilers and industrial pulverized coal boilers, of which nearly 600,000 industrial pulverized coal boilers consume about 640 million tons of coal each year. With the continuous improvement of the supporting system of small and medium-sized industrial pulverized coal boilers, the technology of industrial pulverized coal boilers is becoming more and more mature. However, due to the problems of furnace size and combustion method, the NOx emissions of small and medium-sized industrial pulverized coal boilers are large and easy Problems such as slagging and high content of combustibles in fly ash have become more and more prominent in the...

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Problems solved by technology

[0007] The purpose of the present invention is to solve the problems of high NOx emission, serious slagging, high content of fly ash combustibles and poor combustion stability in the existing industrial pulverized coal boilers, and to provide a boiler that adopts flue gas recirculation and pre-combustion chamber swirl pulverized coal combustion device

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