高背压串联抽汽供热机组多变量因素运行经济性研究分析

Study and Analysis on the Economic Operation of High Back Pressure Series Steam Extraction Heating Unit Under Variable Condition

高背压汽轮机供热改造后,实际供热面积会发生变化,热网循环水流量和机组背压低于设计值运行,供热机组的经济性下降。为研究高背压供热机组实际运行参数偏离设计值后经济性的变化,以高背压串联抽汽机组为例,分析高背压机组电负荷、热网循环水流量、热网回水温度等多变量因素对全厂高背压机组和抽汽供热机组经济性指标的影响,结果表明,高背压机组电负荷降低25 MW,全厂热耗升高约115.27 kJ/(kW·h),热网循环水流量降低1 500 t/h,热网进回水温差升高4.8℃,供热机组的加权热耗降低59.62 kJ/(kW·h)。

IIn order to study the economic changes of the high back pressure heating unit when the actual operating parameters deviates from the design value,a high back pressure heating unit in series with the extraction steam heating units is taken as an example.The effects of the high back pressure unit electric load,the heat network circulating water flow and the heat network return water temperature on the economic indicators of the high back pressure heating unit and extraction steam heating unit are analyzed.The results show that the thermal consumption is increased by about 115.27 kJ.（kW h）^（-1）,and gross coal consumption rate is increased by about 4.86 g.（kW h）^（-1） when the electric load of the high back-pressure unit is decreased by each5 MW.The weighted heat consumption of the heating units of is reduced by 59.62 kJ.（kW h）^（-1） When the heat network circulating water flow reduced by1500 t.h^（-1） and the temperature difference between inlet and return water of heat network increased by 4.8 C.