Gas-reburning-boiler With Air Preheating And Coupling Of Residual Heat Combined Heat Pipe Refrigeration System And Its Optimum Design

With the popularization of clean energy of natural gas,the application of gas turbine combined cycle is more and more.But two kinds of problems are usually encountered in practice.First,to increase the heat and electricity output,increase the fuel capacity of the gas turbine.As a result,more waste heat and more oxygen-enriched chemical energy are lost.Secondly,when the cold quantity user is far from the gas turbine system,the exhaust heat is not convenient to be the heat source of refrigeration,instead,steam is used as refrigeration power.In this paper,a new joint flow,which is a gas turbine-reburning-HRSG with air preheating and refrigeration coupling heat pipe combined system is proposed,and optimal designed.The new joint system is composed of two subsystems: gas turbine-HRSG,HRSG-absorption refrigeration.In the system of gas turbine-HRSG,the reburning HRSG is designed,part of the fuel into the pot in order to reduce the gas turbine exhaust and digestion of the excess oxygen in the smoke,and change the air compression into multistage compression,with HRSG to refuel the flue gas preheating compressed air to improve the combustion chamber temperature,increase the expansion of turbine output,The partial heat of flue gas is upgraded to the output of the turbine,and the compressed power of the air is reduced.In the HRSG-absorption refrigeration subsystem,the heat conduction of heat pipe can transmit the characteristic of long distance,and the waste heat of flue gas is transferred to the generator of absorption refrigeration to provide energy for refrigeration system.Next,this article will carry on three aspects research work.First,in conjunction with thermodynamic analysis,including exergy lose energy level curve(-h diagram)and exergy lose loss analysis,it is concluded that the maximum energy of flue gas,the most work ability,the process Exergy lose loss is the highest,and the energy utilization of the system plays a decisive role in the whole joint system.The optimization idea of the combined system is to improve the high grade force exergy lose of gas turbine and reduce the exergy lose loss of the heat transfer process.The concrete measures can improve the temperature and pressure of gas turbine inlet,the use of high entropy efficiency gas turbine and adjust the parameters of flue gas heat transfer.Second,the joint system is divided into air preheating gas turbine-supplementary burning type rest pot system,absorption chiller unit and separated type heat pipe three parts,establish a new process including the compressor,combustion chamber,gas turbine,waste heat boiler,absorption chiller unit and heat pipe heat exchanger of each unit mathematical model,for the next optimization of the new process lay the foundation.Finally,based on the thermodynamic analysis results and mathematical models,first,with the minimum exergy lose loss and the maximum net yield as the double objective,the optimization of the gas turbine-supplementary combustion type remaining pot system,get its Pareto front,select the optimized point B,its corresponding exergy lose loss is 4265 kW,corresponding reduction of 8.5%,net income for 1.044x106$/years.On the basis of the optimized parameters of flue gas,the optimization of the chiller group is based on the maximum coefficient of COP,the optimization result is 0.8445 and the increase is 1.8%.After the optimization parameters are obtained,the separation heat pipe is optimized with the maximum heat transfer coefficient as the target,and the uhmax=32.2w/(? ?)is optimized.