Simulation And Performance Research Of Chemically Recuperated Gas Turbine

In recent decades, it is still not satisfied concerning about the efficiency and emissions of the simple cycle gas turbine,so many advanced cycles have been proposed by scholars,such the chemical regenerative cycle, because of its high efficiency and low emissions, have been more and more attention. Based on Aspen One platform, a steady-state simulation model of chemically recuperated gas turbine cycle system was established and its performance analysis was made in this dissertation, which treat some marine triaxial gas turbine as prototype. Main tasks include in this dissertation:(1) The simulation model of prototype was established, the main performance parameters were chosen including the design condition, 0.8 condition, 0.7 condition and 0.35 conditions.And the calculation results and experimental values were compared. The results show that the prototype model has higher accuracy and can meet the requirements of variable condition calculation.(2) The heat exchanger-reaction unit series was identified, then a chemical regenerator simulation model was established, and its variable condition performance was analyzed, the conclusion is that the parameters, such as, flue gas temperature, gas flow rate, steam temperature and water / carbon ratio, flue gas temperature is the primary factor of influencing the catalytic reforming reaction, which provides a guideline on how to deepen the reforming reaction degree.(3) The steam generating system which takes the secondary flash as the core was determined,and then the steam generating system variable condition performance was analyzed.The results show that the impact of flue gas temperature and flow rate to steam production is more significant, and the flash pressure variable range is smaller, so that the range of adjusting steam production during the operation is more narrow, so in order to ensure the high performance of the system run, from low condition to high, the amount of fuel injection should slowly be increased;(4) The prototype models, the chemical regenerator model and the steam generation system model were combined, chemical regenerative cycle gas turbine simulation model was established,and its variable condition performance was analyzed. When fill water changes under each of the fuel injection quantity, the variable condition of the STIG and CRGT cycle performance parameters were investigated in the case of constant and variable fill water pressure, best replenishment curves of the STIG and CRGT cycle were obtained. the best allocation of the fuel of the CRGT cycle design point was determined, the performance of the simple cycle, the STIG cycle and CRGT cycle performance at the design point were compared,the results show that the efficiency of CRGT cycle and STIG cycle is increased by 30% and 24.1% respectively compared with simple cycle.(5) In order to solve the insufficient problems of the chemical regenerative cycle catalytic reforming reaction deep, the thermodynamic performance for the other two CRGT cycles scheme was analyzed. The conclusion is the Rear reheat (BR-CRGT) chemical regenerative cycle efficiency is lowest; the intermediate recuperative (MR-CRGT) chemical regenerative cycle efficiency is highest.