燃气轮机联合循环热电联产供热供电量优化分配研究

Research on optimal distribution of heating and power supply in gas turbine combined cycle cogeneration

为研究燃气-蒸汽联合循环机组额定热电任务下的经济运行模式问题,本文运用模块化建模方法对机组各部件建模,基于以热定电的热电比关系,分析了4种供热负荷的5种运行模式的盈利能力。结果表明:纯发电情形下,不同运行模式之间的盈利差值最大值可达到6.04%;随着机组供热负荷的不断增大,与纯发电情况相比,好处归电法发电效率的变化趋势发生改变,不同运行模式间的盈利差值最大值1.52%出现在供热负荷1 388.89 GJ/h机组,几种模式盈利能力差别较小。建议在满足发电量、供热量的前提下,特别是在纯发电和高供热负荷情况下,机组尽可能以高电负荷与低电负荷组合的效率运行模式1运行。

In order to study the economic operation mode of gas-steam combined cycle units under the rated thermoelectric task, this paper uses the modular modeling method to build model for components of the unit. Moreover, based on the thermoelectric ratio of the heat-fixed electricity, the profitability of five operating modes at four heating loads was analyzed. The results show that, the maximum profit difference between different operating modes during pure power generation can reach 6.04%. With the continuous increase of the unit heating load, compared with the pure power generation situation, the benefits of normalization method of electrical power generation efficiency trends changes. The maximum profit difference between different operating modes is 1.52%, which appears when the heating load of the unit is 1 388.89 GJ/h, indicating there are few differences in profitability between each operating mode. On the premise of meeting the demands of power generation and heat supply, it is recommended that the unit be operated in an efficiency mode 1 combing high electricity load with low electricity load as much as possible, especially in the case of pure power generation and high heating load.