An experimental study on NOx emission and carbon burnout from a radial bias whirl coal burner

作者:Xue Shan*; Hui Shi'en; Zhou Qulan; Xu Tongmo
来源:International Conference on Power Engineering (ICOPE-2007), 2007-10-23 to 2007-10-27.
DOI:10.1007/978-3-540-76694-0_148

摘要

Pilot tests have been carried out on a 1 MW pulverized coal furnace to clarify the NO, emission and coal combustion characteristics from a new type radial bias whirl burner. In the test furnace two opposing dual register whirl burners are arranged with o ver fire air (OFA) nozzle along the furnace height. The burner has a cross-section changed central air pipe and a cross-section changed primary air pipe. Inside the primary air pipe, the pulverized coal and air mixture is divided into two streams, i.e., the pulverized coal rich annular jet inside and the pulverized coal lean annular jet outside; due to inertial force, resulting in a dense-dilute pulverized coal concentration profile in the radial direction of the burner nozzle. The tests are performed by using Shenhua high rank bituminous coal(SH coal), Hejin low rank bituminous coal(HJ coal) and Changzhi lean coal(CZ coal). The purpose of the tests is to make clear the effects of the relative position of OFA nozzle, the OFA ratio, the primary air ratio, the inner secondary air ratio, the outer secondary air ratio, the inner secondary air swirling intensity, the outer secondary air swirling intensity, and the various combinations of these parameters, on the production and emission of NO, and the carbon burnout. As such, the relationship between NO, emission and carbon burnout and the relationship between combustion stability and economy can be obtained. These test results are of significance for industrial design.

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