Research On An Efficient Distributed CCHP System Driven By Gas Turbine

This paper targets for the gas turbine as the prime mover in regional-based distributed energy CCHP systems,for solving the problem that conventional absorption unit can not achieve regional heating temperature and heat load of high temperature resource can not taken full advantage of,proposing the first type single effect-double effect heat recovery unit and first type single effect heat recovery unit,what consist of a new absorption-type cooling and heating system.Gas-steam combined power generation system and the new absorption cooling and heating system composed of the efficient gas turbine CCHP distributed energy systems.Based on the whole efficient distributed energy system,establishing a mathematical model of main system components in design conditions and variable condition under different partial load rate of the gas turbine.Introducing details of the work flow and the thermal calculation method of the first type single effect-double effect heat recovery unit and first type single effect heat recovery unit.Programming the whole computer program on MATLAB software.Treating the buildings group as the study object of distributed energy system,according to the different needs of heating load、cooling load and electric load in different typical day and in different season,analyzing new absorption cooling and heating system performance characteristics comparing with conventional absorption unit.And the results show that energy saving rate of the new absorption cooling and heating system is 15.3% in heating condition,and cooling capacity increase by 46% in cooling condition.The effects of different part load rate of the gas turbine on exhaust gas temperature、exhaust gas flow and waste heat boiler parameters is studied.The simulation runs on typical day with "heat decides power" operation strategy and analysis the utilization rate of primary energy and its saving rate on 6 typical day.Finally,for achieving optimal primary energy efficiency and energy saving rate of the system,optimize the capacity and number of gas turbine units.The results shows that when the capacity load ratio is in the 0.3 to 1.5 range,equipped with 1.5 capacity load ratio and 3 gas turbine units will achieve optimal average energy saving rate of 32.8%.Equipped with 0.7 capacity load ratio and 2 gas turbine units will achieve optimal average primary energy utilization rate of 82.1%.