为提高某超临界抽凝供热机组的运行经济性，分析了供暖期热负荷、背压等因素对传统机组负荷—主蒸汽压力滑压曲线适用性的影响。针对该抽凝供热机组，通过宽负荷滑压优化试验，给出了以主蒸汽流量为自变量的滑压优化曲线，在此基础上提出了在线计算主蒸汽流量的模型。试验结果表明：不同负荷下计算的通流系数基本为一定值，符合理论分析；不同通流系数下，计算主蒸汽流量和试验主蒸汽流量之间的相对误差均不超过1%；该模型计算的主蒸汽流量与试验值吻合度较高，能满足滑压运行的在线实时控制。

In order to improve the operation economy of a supercritical condensing heating units，the effect of the factors of thermal load and back pressure in heating period on the feasibility of traditional sliding pressure operation curve of unit load and main steam pressure was analyzed.Through the wide load sliding pressure optimization tests of the condensing heating unit,a new sliding pressure optimization curve with main steam flow as the independent variable was given.On this basis,a model for online calculation of main steam flow was proposed.Test results show that the calculated flow coefficient is basically a definite value under different loads,which is consistent with the theoretical analysis; and the relative error between the calculated main steam flow and the test main steam flow is less than 1% under different flow coefficients.The main steam flow calculated by the model is in good agreement with the test value,which can meet the online realtime control of sliding pressure operation.

TK267