超临界CO2部分冷却布雷顿循环分析

摘要

为了确定部分冷却布雷顿循环各设备节能潜力,得出应用于聚光太阳能技术(Concentrating Solar Power,CSP)的最优可能工作参数,为以后建设超临界CO2(Supercritical Carbon Dioxide:S-CO2)布雷顿循环太阳能热电站提供参考依据,使用EES(Engineering Equation Solver)对应用于CSP的具有一级再热的100 MW S-CO2部分冷却布雷顿循环进行效率和损系数分析,主要分析在不同透平入口温度,再热压力以及循环压比比对循环效率的影响,同时分析各设备损系数的大小.得出冷凝器损最大,因此后续可通过增加底循环来利用冷凝器的.最大效率的最优工作参数为透平入口温度700 ℃,再热压力为9.5 MPa,循环压比比为0.4,此时循环效率为33.73%,循环热效率为50.90%.%In order to determine the energy-saving potential of the equipments that apply to the partial cooling brayton cycle, the optimal working parameters that are applied to concentrated solar thermal power plants (CSP) are summarized which could provide some references for the solar thermal power plants of the construction of supercritical CO2(S-CO2) brayton cycle.The engineering equation solver (EES) is used to carry out the exergy analysis of a 100 MW S-CO2 partial cooling brayton cycle which is used in CSP.By analyzing the influence of the turbine inlet temperature and cycle pressure ratio on the circulating exergy efficiency and the influence of the different turbine inlet temperature on the exergy loss coefficient of each equipment, the result that the maximum exergy loss exists in condensers compared with other equipments is obtained.Therefore, by taking advantage of the useful exergy of the condensers, the bottom cycles can be greatly bettered.When the turbine inlet temperature is 700 ℃, the reheat pressure is 9.5 MPa, and the cyclic pressure ratio is 0.4, and the circulating exergy efficiency is 33.73% and cycle thermal efficiency is 50.90%.