Multi-pass industrial pulverized coal boiler with flue gas recirculation technology and swirl pulverized coal burner on top

Abstract

The invention discloses a multi-pass industrial pulverized coal boiler with a flue gas recirculation technology and a swirl pulverized coal burner on the top, and relates to an industrial pulverized coal boiler. The multi-process industrial pulverized coal boiler aims to solve the problems that a NOx emission load is high and burnout performance is poor in the existing industrial pulverized coal boiler. The multi-pass industrial pulverized coal boiler comprises a primary air pipe, a straight-flow secondary air pipe, a swirl inner secondary air pipe and a swirl outer secondary air pipe, and a boiler body is internally provided with a zigzag channel with three flue gas passes; the primary air pipe is arranged in the straight-flow secondary air pipe, the straight-flow secondary air pipe is arranged in the swirl inner secondary air pipe, and the swirl inner secondary air pipe is arranged in the swirl outer secondary air pipe; axial swirl blades are mounted in the swirl inner secondary airpipe and the swirl outer secondary air pipe; nozzles of the primary air pipe, the straight-flow secondary air pipe, the swirl inner secondary air pipe and the swirl outer secondary air pipe are flushwith a boiler top of the boiler body; a flue gas recirculation system communicates with the straight-flow secondary air pipe, the swirl inner secondary air pipe and the swirl outer secondary air pipe;and an outlet of an air-pulverized coal system communicates with the boiler body through the primary air pipe. The multi-pass industrial pulverized coal boiler is used for the manufacturing field ofthe coal-fired industrial boiler.

Description

technical field [0001] The invention relates to an industrial pulverized coal boiler, in particular to a multi-stroke industrial pulverized coal boiler with a central powder-feeding swirl pulverized coal burner mounted on top of the flue gas recirculation. Background technique [0002] In my country, coal-fired industrial boilers are the main coal-consuming equipment except power plant boilers, with a total of nearly 600,000 units and an annual coal consumption of nearly 640 million tons. my country's coal-fired industrial boilers mainly have problems such as high NOx emissions, low boiler efficiency, and easy slagging. The National Ministry of Environmental Protection promulgated the "Boiler Air Pollutant Emission Standard" (GB13271-2014) on May 16, 2014, which clearly stipulates that coal-fired hot water boilers with a capacity of more than 7MW will be reduced to NOx from October 1, 2015. Emissions shall not exceed 400mg / m 3 ; From October 1, 2015, new coal-fired hot wat...

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Problems solved by technology

[0004] The present invention aims to solve the problems of high NOx emission and poor burnout of current industrial pulverized coal boilers, and provides a multi-stroke industrial pulverized coal boiler with flue gas recirculation and swirl pulverized coal burners mounted on top

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