带回热的燃气轮机-有机朗肯联合循环热力设计

Thermodynamic Design of Gas Turbine and Organic Rankine Combined Cycle with Recuperators

燃气轮机以其高效率、低污染、运行成本低的优点被广泛应用于分布式发电系统中。为了进一步提升天然气资源的利用率,本文提出了带回热的燃气轮机-有机朗肯(ORC)联合循环,以高临界温度的有机物为底循环工质,来回收燃气轮机排气中的余热。建立了带回热的燃气轮机-ORC联合循环的模型,提出了使该联合循环热效率最优的热力设计方法,进行了不同设计条件下的仿真试验。结果表明,与传统的燃气-蒸汽动力循环相比,带回热的燃气轮机-ORC联合循环具有更高的联合循环热效率。选择甲苯作为底循环工质,可以获得最高的联合循环效率。此外,燃气轮机-ORC联合循环可以用于热电联供,同时满足区域电负荷和热负荷的要求。

Gas turbines have advantage of high efficiency,low pollution and low operation cost and are widely used in distributed power generation.To further enhance the energy efficiency of natural gas,a gas turbine and Organic Rankine(ORC)combined cycle was proposed in this paper.Waste heat of gas turbine exhaust was recovered by organic working fluids with a high critical temperature.Then thermodynamic model was established and optimum thermodynamic design method was proposed for the GT-ORC combined cycle.Results showed that the GT-ORC combined cycle with recuperators had better thermodynamic performance than the traditional GT-steam Rankine combined cycle.Toluene was an suitable working fluid for ORC and its combined cycle had the highest combined cycle efficiency.Moreover,this GT-ORC combined cycle could also be utilized for thermo-electric applications to satisfied the demand of thermal load and electric load simultaneously.