The Effect of the Ratio of the Secondary and Tertiary Air on the Outlet Velocity Field of the New Swirling Pulverized Coal Burner

Rong Yan; Zhiwei Zheng; Zhichao ChenLinxuan YuanBo ZhangLingyan ZengZhengqi Li

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The Effect of the Ratio of the Secondary and Tertiary Air on the Outlet Velocity Field of the New Swirling Pulverized Coal Burner

机译：The Effect of the Ratio of the Secondary and Tertiary Air on the Outlet Velocity Field of the New Swirling Pulverized Coal Burner

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摘要

The outlet velocity field of the pulverized coal burner is one of the important factors affecting its operating characteristics. In this article, cold tests were carried out for a new swirl burner with a pre-combustion chamber, and the influence of the air ratio on the outlet velocity field of the burner was studied. Through the cold single-phase test on the 1:3 model test bench, the burner outlet cold air velocities were obtained. The results shown that the formation of the central recirculation zone was mainly affected by the secondary air, a stable central recirculation zone could not be formed when the velocity of secondary air was too low. When the total air of the burner was fixed, the secondary air increased, the length of the central recirculation zone increased, and the mixing speed between different flows increased. When the ratio of the mass flow of the secondary air to tertiary air increased from 26:74 to 85:15, the reflux rate increases 5.5 times, which helped to keep the combustion stable.

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来源
《Combustion science and technology》 |2023年第8期|1221-1234|共14页
作者
Rong Yan; Zhiwei Zheng; Zhichao ChenLinxuan YuanBo ZhangLingyan ZengZhengqi Li;
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作者单位

School of Energy Science and Engineering, Harbin Institute of Technology, Harbin, P.R. China;

School of Energy Science and Engineering, Harbin Institute of Technology, Harbin, P.R. China, School of Mechanical Engineering, Shanghai Dianji University, Shanghai, P.R. China;

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正文语种英语
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Industrial pulverized coal boiler; swirl burner; cold velocity field; recirculation zone; pre-combustion chamber;

The Effect of the Ratio of the Secondary and Tertiary Air on the Outlet Velocity Field of the New Swirling Pulverized Coal Burner

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