Primary air rich-lean separation multi-stage turbulent burner and working method thereof

Abstract

The invention discloses a primary air rich-lean separation multi-stage turbulent burner and a working method thereof, and belongs to the technical field of pulverized coal burners. The primary air rich-lean separation multi-stage turbulent burner comprises a central air pipe, a primary air channel, an inner secondary air channel and an outer secondary air channel which are sequentially arranged from inside to outside; a pulverized coal dense-thin separation device and a primary air channel partition plate are arranged in the primary air channel; inner primary air rotational flow blades are arranged in the inner primary air channel, outer primary air rotational flow blades are arranged in the outer primary air channel, and the rotational flow strength of the outer primary air rotational flow blades is larger than that of the inner primary air rotational flow blades; secondary air rotational flow blades are arranged in the inner secondary air channel; and an outlet of the outer primary air channel is provided with an outer primary air flaring, an outlet of the inner secondary air channel is provided with an inner secondary air flaring, and an outlet of the outer secondary air channel is provided with an outer secondary air flaring. The problems that an existing pulverized coal boiler is low in pulverized coal burn-off rate, difficult to adapt to inferior coal, poor in combustion stability and high in NOx emission amount are solved through dense-thin separation and a multi-stage rotational flow structure.

Description

technical field [0001] The invention belongs to the technical field of pulverized coal burners, and in particular relates to a multi-stage swirl burner for primary air concentration and thinness separation and a working method thereof. Background technique [0002] With the increasing importance of energy saving and emission reduction, the structural optimization of pulverized coal boiler burners has become more and more important. Improving the timely ignition and stable combustion performance of pulverized coal so as to be suitable for low-quality coal while reducing NOx emissions is the main research direction of pulverized coal burners at present. Multi-stage air distribution and primary air concentration-lean separation technology is currently one of the most widely used and most mature stable combustion and low NOx technologies. [0003] The dense pulverized coal distribution in the inner part is conducive to the timely ignition and stable combustion of pulverized coa...

AI Technical Summary

Problems solved by technology

The above two kinds of external secondary air are injected in a swirling flow, which may cause the airflow in the furnace to generate flash and scrape the wall, cause the water wall to burn or coke, and seriously affect the operation of the boiler.

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