CAJ | 학술논문

电站锅炉风量测量装置准确度差、标定复杂。提出一种锅炉总风量软测量方法，通过分析煤燃烧产生热量与消耗空气量之间的关系，推导出利用热量-氧量计算风量的基本公式。从理论上可以消除未完全燃烧损失影响，因此热量计算过程相对简单。进一步经过煤质和空气湿度修正后，可以采用干烟气氧量或湿烟气氧量计算风量并具有更高的准确度。最后引入给煤量信号进行动态补偿，可保证软测量风量的动态响应速度同实际风量相一致。在一600 MW机组上，通过实验对比不同负荷工况下软测量风量与实际测量风量，结果表明软测量准确度好、动态响应速度快、受煤质变化影响小，能够满足现场需要。
전참과로풍량측량장치준학도차、표정복잡。제출일충과로총풍량연측량방법，통과분석매연소산생열량여소모공기량지간적관계，추도출이용열량-양량계산풍량적기본공식。종이론상가이소제미완전연소손실영향，인차열량계산과정상대간단。진일보경과매질화공기습도수정후，가이채용간연기양량혹습연기양량계산풍량병구유경고적준학도。최후인입급매량신호진행동태보상，가보증연측량풍량적동태향응속도동실제풍량상일치。재일600 MW궤조상，통과실험대비불동부하공황하연측량풍량여실제측량풍량，결과표명연측량준학도호、동태향응속도쾌、수매질변화영향소，능구만족현장수요。
Since measurement facility for air volume of utility boiler has poor accuracy and is complicated to standardize, a soft-sensor method for total air volume in boiler was presented. By analyzing the relation between coal combustion heat and consumed air, the basic formula for air volume based on heat-oxygen content was constructed, which can eliminate the influence of unburned carbon theoretically, so the heat calculation process was relatively simple. After amending the coal quality and air humidity, by using the dry or wet flue gas oxygen content, the air volume with better accuracy was obtained. After the dynamic compensation of fuel flow, the consistency of dynamic response time between soft-sensor signal and practical signal was ensured. By the experiment in a 600 MW unit, the comparison between soft-sensor signal and practical signal of total air volume under different operation conditions was made. The experiment results show that the soft-sensor signal has the merits of better accuracy and quick dynamic response, and it is insensitive to the changes of coal quality, which can meet the local requirements in the thermal power plant.