集成太阳能辅助供热的600 MW高背压热电联产机组的运行及优化

为了解决太阳能辅助燃煤发电系统与太阳能辅助抽汽供热系统的余热损失增多问题，提出一种太阳能辅助高背压热电联产系统的优化改造方案。利用EBSILON软件采用数值模拟的方法，对改造前后机组的整体性能和改造后机组在不同发电功率、背压、热网供回水温度工况下的收益变化进行了分析，对比了改造前后机组的(火用)效率与经济性差异。结果表明：改造后的太阳能辅助高背压热电联产系统节煤更多，机组回收了集成太阳能产生的余热后供热能力增强；改造后的机组在低发电功率、较高背压和较低热网供回水温度时节煤更多；在低发电功率、较低背压及较高热网供回水温度时机组的供热能力更强；改造后的太阳能辅助高背压热电联产系统(火用)效率更高、系统的经济效益更佳。

Operation and optimization of 600 MW high back pressure cogeneration unit with integrated solar assisted heating

In order to solve the problem of increasing waste heat loss of solar assisted coal fired power generation system and solar assisted steam extraction heating system, an optimal transformation scheme of solar assisted high back pressure cogeneration system was proposed. The method of EBSILON software simulation was adopted to analyze the overall performance of the unit before and after the transformation and the change of unit income under the conditions of different generated power, back pressures and supply and return water temperatures of the heat network after the transformation, and compare the difference of unit exergy efficiency and economy before and after the transformation. The results show that the retrofitted solar assisted high back pressure cogeneration system saves more coal, and the heat supply capacity is enhanced after the unit recovers the waste heat generated by integrated solar energy; the retrofitted unit saves more coal when the power generation load is low, the back pressure is high, and the supply and return water temperatures of the heat network are low; the heat supply capacity of the unit is stronger when the power generation load is low, the back pressure is low, and the supply and return water temperatures of the heat network are high; the retrofitted solar assisted high back pressure cogeneration system has higher exergy efficiency and better economic benefits.