Applied Research on the Serial Distribution Mode of Heating System

It was proposed that the system for heating was operated in series distribution after the non-throttle conditions to reduce the throttle loss and improve the power generation through analyzing the combined characteristic of the cogeneration heating and power system,for the current situation that the heating system was used in parallel distribution in the most of power plant in China.At the same time,several different distribution mode models were also proposed,and then compared quantively and analyzed.It can be known that the extraction pressure for heating of the first stage units is decreased and that of the second stage units is increasing when the heating system are operating in series,but,totally,the extraction pressure for heating of units which operats in series is lower than the extraction pressure for heating of units which operats in parallel;in order to better use the extraction pressure for heating reduced by the first stage unites which operates in series,the thermal system heater area should be increased or the enhanced heat transfer tube should be used,so,they can increase the heat transfer performance to decrease the extraction pressure for heating of the second stage units in series,which increased in originally;so that the generating capacity increases more and the energy cascade utilization is achieved.