摘要
针对某电厂350 MW机组配备D-11D型双进双出钢球磨煤机的制粉系统存在出力不足等问题,本文通过对磨煤机出力的理论计算和制粉系统调整,分析了磨煤机出力不足的原因,提高了制粉系统出力。结果表明:磨煤机出力与通风量正相关,仅调整磨煤机运行方式增加磨煤机通风量并不能真正提高磨煤机的研磨能力。容量风门开度增大,磨煤机通风量增加使得研磨煤量增加的同时,煤粉变粗。如果磨煤机通风量不足,仅增加钢球装载量提高研磨能力也不能有效提高磨煤机出力。煤质变化后,为提高磨煤机出力,在增加钢球装载量,提高磨煤机研磨能力的同时,还需相应增加磨煤机的通风量,增强携带煤粉的能力。磨煤机运行方式未随煤质变化及时调整以及磨煤机钢球装载量不足导致研磨能力下降是造成磨煤机出力不足的主要原因。根据试验结果通过增加磨煤机钢球装载量及磨煤机通风量,保持热一次风母管风压7.0 kPa不变,A、B、C三台磨煤机运行容量风门开度置于75%时,制粉系统总风量达到209 t/h,制粉系统总出力由128 t/h提高至137.89 t/h,带负荷能力由280 MW提高至320 MW。容量风门开度置于90%时,制粉系统总出力提高至144.84 t/h,带负荷能力提升至337 MW,制粉系统总出力及带负荷能力显著提高。
A power plant equipped with foster wheeler D-11D type double inlet and outlet pulverizing system has the problem of insufficient output.In this paper,based on the theoretical calculation of the pulverizer output and the test adjustment of the pulverizing system,the reason of the lack of the pulverizing output was analyzed,and the output of the pulverizing system was improved.The results of calculation and test show that the output of pulverizer is positively correlated with the ventilation rate,and only adjusting the operation mode of pulverizer to increase the ventilation rate of pulverizer can not really improve the grinding capacity of pulverizer.With the increase of the opening of the damper and the increase of the air flow of the pulverizer,the amount of grinding coal increases and the pulverized coal becomes coarser.If the pulverizer ventilation is insufficient,only increasing the steel ball loading capacity to improve the grinding capacity can not effectively improve the pulverizer output.After the change of coal quality,in order to improve the power of the pulverizer,in addition to increasing the load of steel balls and improving the grinding capacity of the pulverizer,it is necessary to increase the ventilation capacity of the pulverizer and enhance the capacity of carrying pulverized coal.The main reasons for the insufficient output of the pulverizer are that the operation mode of the pulverizing system is not adjusted correspondingly with the change of coal quality and the grinding capacity decreases due to the insufficient loading of steel balls of the pulverizer.According to the test results,by increasing the loading capacity of steel mill and increasing the pulverizer ventilation rate adjustment measures,the air pressure of the main pipe of the hot primary air remains unchanged at 7.0 kPa,and A,B,C three coal mill run capacity when the damper opening at 75%,the total air flow in the pulverizing system reaches 209 t/h,the total output of the pulverizing system increases from 128 t/h to 137.89 t/h,and the loading capacity increases from 280 MW to 320 MW.When the damper opening is set at 90%,the total output of the pulverizing system increases to 144.84 t/h,and the load capacity increases to 337 MW.The total output and load capacity of the pulverizing system were significantly increased.
作者
张锋
杨凯
徐龙
ZHANG Feng;YANG Kai;XU Long(Xi′an Thermal Power Research Institute Co.,Ltd.,Xi′an 710054,China;Sanhe Power Generation Co.,Ltd.,Sanhe 065201,China;Xi′an Yitong Thermal Technology Services Co.,Ltd.,Xi′an 710032,China)
出处
《洁净煤技术》
CAS
2019年第5期138-143,共6页
Clean Coal Technology
基金
国家重点研发计划资助项目(2017YFB0602003)
关键词
制粉系统
D-11D磨煤机
磨煤机出力计算
煤粉细度
磨煤机通风量
pulverizing system
D-11D pulverizer
output calculation of pulverizer
pulverized coal fineness
ventilation of pulverize
