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在确保机组安全运行的条件下,通过优化汽轮机初、终参数,提高其变工况运行的效率,以提高机组的经济效益,对火电机组节能减排具有非常重要的意义。通过运用功率背压特性的通用计算方法确定排汽压力对汽轮机功率的修正曲线,从而得到各负荷工况下循环水泵相邻运行方式的等效益点,进而获得等效益曲线。在循环水泵运行优化的基础上,结合逆序法变工况理论,建立了机组初压和背压的优化模型,以某厂C300-16.7/0.43/537/537机组为例,运用改进粒子群优化算法寻优得到了各运行工况的最优初压和背压。结果表明:当机组定负荷运行时,通过调整配汽方式,可得到使供电效率最大所对应的主蒸汽压力和排汽压力,为火电机组的运行参数优化提供参考。
Under the condition of ensuring the safe operation of the unit, it is very important for the thermal power unit to save energy and reduce emissions by optimizing the initial and final parameters of the steam turbine to improve the efficiency of its operation under varying conditions so as to improve the economic benefits of the unit. By using the general calculation method of power backpressure characteristic, the correction curve of exhaust steam pressure on steam turbine power is determined, and the equivalent benefit of adjacent operation mode of circulating water pump under various load conditions is obtained, and then the equivalent benefit curve is obtained. Based on the operation optimization of circulating pump and combined with the theory of reverse sequence method, an optimized model of initial pressure and back pressure of the unit was established. Taking a factory C300-16.7 / 0.43 / 537/537 as an example, an improved particle swarm optimization The optimal initial pressure and backpressure of each operating condition are obtained by algorithm optimization. The results show that the main steam pressure and steam pressure corresponding to the maximum power supply efficiency can be obtained by adjusting the steam distribution mode when the unit is under a constant load, which can provide reference for the optimization of the operating parameters of the thermal power unit.