开式回热燃气轮机热电冷联产装置性能优化

建立了考虑压降的开式回热燃气轮机热电冷联产装置的有限时间热力学模型,导出了各个部件的相对压降和各个热流率与压气机进口相对压降的关系式,以第一定律效率、火用]输出率、火用]效率和利润率为目标,在无燃料消耗和装置尺寸约束下,通过数值计算发现分别存在最佳的压气机进口相对压降使火用]输出率和利润率取得最优值,进一步优化压比,得到了最大火用]输出率和利润率,分别存在最佳的供热温度使最大火用]输出率和利润率取得双重最大值,以利润率为设计目标能够减小装置的尺寸.在燃料消耗和装置尺寸约束下,优化了压气机进口相对压降,得到了最优效率,同时各部件流通面积分配也得到了优化.回热能够增大装置的利润率和效率.

Performance Optimization for an Open Regenerative Gas Turbine Combined Cooling,Heating and Power Plant

Considering pressure drop, a finite time thermodynamic model of an open regenerative gas turbine combined cooling, heating and power plant is established. The formulae of all the components＇ relative pressure drops and heat transfer rates versus the relative pressure drop of compressor inlet are deduced. By taking first law efficiency, exergy output rate, exergy efficiency and profit rate as objectives, when there is no constraint for fuel consumption and total size of the plant, it is found by numerical calculations that there exist optimal compressor inlet relative pressure drops respectively which lead to optimal exergy output rate and profit rate. When the optimization is performed further with respect to pressure ratio, the maximum exergy output rate and profit rate are obtained. There exist optimal thermal consumer temperatures respectively which lead to double maximum exergy output rate and profit rate, and the size of the plant can be decreased by taking profit rate as the design objective. In the case of constraints for fuel consumption and total size, the compressor inlet relative pressure drop is optimized, and the optimal efficiencies are obtained. Meanwhile, the components＇ flow area distributions are optimized. Regeneration can increase profit rate and efficiencies of the plant.