A DC burner with central air

Abstract

The invention discloses a direct flow burner with central air. The direct flow burner with the central air comprises a central air channel and a central air spray nozzle and further comprises a primary air channel wall surface and a surrounding air channel wall surface of which the cross sections are rectangular and which are arranged in sequence from inside to outside. A primary air channel is formed in the primary air channel wall surface; a surrounding air channel is formed between the primary air channel wall surface and the surrounding air channel wall surface; the two ends of the central air channel are air inlets, and an air outlet is formed in the middle of the central air channel; the two ends of the central air channel penetrate through the primary air channel wall surface to be communicated with the surrounding air channel; the air outlet of the central air channel is communicated to an air inlet of the central air spray nozzle; the facing direction of an air outlet of the central air spray nozzle and the primary air flowing direction are the same. By means of the direct flow burner with the central air, the steady burning effect of a boiler when burns low volatile components or low heating value coal types and operates during low load can be improved.

Description

Technical field: [0001] The invention belongs to the field of boiler burners burning pulverized coal, and in particular relates to a direct-flow burner with central wind. Background technique: [0002] Due to the improvement of national environmental protection requirements, most of the once-through burners used in pulverized coal boilers have adopted various forms of thick-lean separation devices to realize the separation of thick-lean pulverized coal in boiler burners, so as to achieve low-nitrogen combustion. However, when some coals with low volatile content or low calorific value are used, and when the boiler is operated at low load, the phenomenon of unstable combustion will occur, which seriously affects the safe operation of the boiler. Invention content: [0003] The purpose of the present invention is to provide a once-through burner with central wind, which can improve the stability of pulverized coal combustion and ensure the safety of boiler operation. [000...

AI Technical Summary

Problems solved by technology

However, when some coals with low volatile content or low calorific value are used, and when the boiler is operated at low load, the phenomenon of unstable combustion will occur, which seriously affects the safe operation of the boiler.

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