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The Impact of Key Factors on Flow Characteristics of 14 MW reverse-Swirl Pulverized Coal Burner

Journal of Thermal Science 2021年第6期30卷 2214-2222页

作者： JIA Nan NIU Fang LIU Pengzhong WANG Zhixing WANG Naiji ZHOU Jianming China Coal Research Institute Company of Energy Conservation Beijing 100013China State Key Laboratory of High Efficient Mining and Clean Utilization of Coal Resources Beijing 100013China National Energy Technology&Equipment Laboratory of Coal Utilization and Emission Control Beijing 100013China

reverse-swirl(RS)burner which has been industrialized couples reverses jet and swirl flow for the stabilization of flame.Using Dantec multichannel constant-temperature anemometer,experiments on airflow characteristics were implemented on a 1:2 scaled burner model with different values in terms of reverse primary air(RPA)ratio and swirl inner secondary air(SISA)ratio.It was found that the shape of annular coupled recirculation zone(ACRZ)had stayed symmetrical all the time.The RPA ratio was the main factor that had an impact on the values of axial and RMS velocity as well as the radial velocity direction of ACRZ.Both RPA ratio and SISA ratio had a great impact on the area of ACRZ,relative reverse flow rate,mixing between SISA and outer secondary air(OSA)as well as swirling ability of the airflow.The area of ACRZ reached its peak when the RPA ratio was 11.92%or SISA ratio was 17.03%;however,when the RPA ratio and SISA ratio reached 14.86%and 28.41%respectively,the combination of RPA and SISA became relatively favorable;besides,ACRZ area,relative reverse flow and swirling ability became suitable and the mixing between SISA and OSA was relatively delayed.The research was of great practical and theoretical importance to the design and operation of RS burner.

关键词： reverse-swirl burner reverse primary air swirl inner secondary air annular coupled recirculation zone flow characteristics

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