基于单耗理论的抽汽耦合高背压供热优化

随着新型高效供热技术的广泛应用，多种供热技术耦合供热运行优化成为亟须研究的课题。基于自主研发的热力系统集成优化软件搭建了热电联产机组热力系统仿真模型，建立了基于㶲；分析法的单耗分析模型，研究了供热单耗和供电单耗随主蒸汽流量的变化特性，通过单耗分析得到了抽汽耦合高背压供热模式（模式一）和抽汽梯级利用耦合高背压供热模式（模式二）的最优运行工况。结果表明：模式二最优工况的供热单耗和供电单耗比模式一最优工况分别低1.6 kg/GJ和4.6 g/（kW·h）；模式一的供热能力较大，在次寒期可实现2台机组主蒸汽流量600~1 000 t/h范围供热。研究结果对抽汽耦合高背压供热运行优化具有一定的指导意义。

Optimization of Steam Extraction Combined High Back Pressure Heating Based on Specific Consumption Theory

With the wide application of new and high efficiency heating technology, it is becoming urgent to study the operation optimization of various heating technology combined heating. The simulation model of thermal power system is set up by using self-developed thermal power integration scheme (TPIS) software, together with the specific consumption analysis model established on the basis of exergy analysis method. The characteristics of heating specific consumption and power supply specific consumption varying with the load were studied. Then the optimal operating conditions of steam extraction combined high back pressure heating (mode one) and extracting steam cascade utilization combined high back pressure heating (mode two) are obtained by means of specific consumption analysis. Results show that the heating specific consumption and power supply specific consumption of mode two under the optimal condition are 1.6 kg/GJ and 4.6 g/(kW·h) lower than those of mode one, respectively. Mode one demonstrates higher heating capacity, which can supply heat within the range of 600 t/h to 1 000 t/h for main steam flow during secondary cold period. The research outcome can provide certain guidance for the operation optimization of steam extraction combined high back pressure heating.