基于粉管动压和煤粉分配的热态条件下中速磨煤机入口风量标定试验方法  

Calibration test method for inlet air volume of medium speed coal mill under hot conditions based on powder tube dynamic pressure and coal powder distribution

作　　者：许积庄 沈志刚[1] 沈娅芳[1] 王洋 潘胜中[1] 陈模 张钧玮[1] XU Jizhuang;SHEN Zhigang;SHEN Yafang;WANG Yang;PAN Shengzhong;CHEN Mo;ZHANG Junwei(Xiamen Huaxia International Power Development Co.,Ltd.,Xiamen 350200,China;Xi’an Thermal Power Research Institute Co.,Ltd.,Xi’an 710054,China)

机构地区：[1]厦门华夏国际电力发展有限公司,福建厦门350200 [2]西安热工研究院有限公司,陕西西安710054

出　　处：《热力发电》2024年第5期75-81,共7页Thermal Power Generation

基　　金：国家电力投资集团有限公司科技项目(2023-KJ-005)。

摘　　要：针对中速磨煤机输运介质特点及入口管路、空间等限制,冷态纯空气条件下的测试方法无法保证磨煤机入口风量标定测试及时性的问题,热态运行工况下,选取流场稳定的磨煤机出口管道,采用等截面网格法测试各粉管动压和煤粉分配特性,并用循环迭代法获取风粉混合物流速,最终以实测的磨煤机出口风粉混合物流量与煤量、设计密封风量的差值对磨煤机入口风量进行标定。试验结果表明,在相同的实测原始数据基础上,采用上述方法获取的磨煤机入口流量更接近真实值,准确性较采用冷态纯空气条件下的计算结果提升约15百分点。该方法测试简单,实操性强,可有效提升中速磨煤机入口风量标定结果的准确性和及时性,同时,对相似工业环境中含粉气流流量的测试也有一定的指导作用。Due to the characteristics of the medium transported by medium speed coal mill and the limitations of the inlet pipeline and space,the testing method under cold pure air conditions cannot guarantee the timeliness of the calibration test for the inlet air volume.Under hot conditions,the outlet pipeline of the coal mill was selected as test object for its stable flow field.The dynamic pressure and pulverized coal distribution characteristics of each powder pipe were tested by the equal cross-section grid method.The flow velocity of the air-powder mixture was obtained by the cyclic iterative method.Finally,the inlet air volume of the coal mill was compared and calibrated by the difference between the measured air-powder mixture flow rate,the coal quantity and the design sealing air volume.The practical results show that,on the basis of the same measured original data,the inlet flow rate obtained by the method above is closer to the real value,the accuracy can be improved by about 15 percentage points compared with the calculation results with cold conditions method.This method is simple to test and practical,which can effectively improve the timeliness and accuracy of the inlet air volume calibration results of medium-speed coal mill under hot conditions,and at the same time,it also has a certain guiding role in test of the flow rate of powder-containing gas in similar industrial environments.

关 键 词：中速磨煤机 风粉混合物 一次风量 电站锅炉 

分 类 号：TM621.2[电气工程—电力系统及自动化]