Study On Advanced Energy System Based On Micro Gas Turbine

Developing the distributed energy system(DES) is in favor of realizing the harmonious development of energy sources and environment, so that centralized power grid combining with DES has become a main development trend of power industry during the 21st centuries. Energy system based on micro gas turbine(MGT) is one of main development way of DES. Among them, MGT cooling, heating and power cogeneration system and hybrid cycle power system with MGT and high temperature fuel cell are two kinds of DES with better prospect. Aiming at existing problem in the two kinds of energy system, some improvement measures were putted forward. The more advanced energy systems with the core component of MGT were obtained. The obtained results are beneficial to driving the development of DES in our country.However, the frequent mismatch problem of the cooling, heating and power load of DES weakens the advantage of energy cascaded utilization, which is an important problem in the current cogeneration system. Firstly regulating methods were studied in order to enhance the off-design performance of the cogeneration system. Then new measures including steam injection and inlet air cooling were presented.Then integrated cooling, heating and power cogeneration system with steam injection,inlet air cooling and water recovery was brought forward which is more advanced DES based on MGT. Evaluation criterion for cooling, heating and power cogeneration system was also studied at last. A new evaluation criterion which is named as energy cascade utilization efficiency was proposed from the essential features of the combined cooling heating and power generation system.The hybrid cycle power system with MGT and high temperature fuel cell is another kind of DES which based on MGT. The improvement study for SOFC/MGT hybrid system was carried with the typical topping cycle SOFC/MGT hybrid system as emphases. The optimization rules of main parameters of SOFC/MGT hybrid system were revealed and the constraint conditions which limit the further improvement of overall hybrid system efficiency were given. Two kinds of new SOFC/MGT hybrid systems were presented according to the basic idea to make more fuel paticipate in electrochemical reaction instead of traditional combustion reaction. The calculation results proved that their efficiency was enhanced remarkably. Then the quasi-zero CO2 emission SOFC/MGT hybrid cycle system was studied. The quasi-zero CO2 SOFC/MGT hybrid cycle system with CO2 separation from the tail flue gas by using the ammonia solution absorption method was analyzed. Then a new quasi-zero CO2 emission SOFC/MGT hybrid cycle system was proposed based on the improvement of the typical topping cycle SOFC/MGT hybrid cycle system. Research results show that the new quasi-zero CO2 emission system has higher efficiency.Some original ideas and means were presented aiming at energy system based on MGT in this paper from several aspects including improving performance under off-design condition, boosting system efficiency, enhancing environmental protection performance and improving system evaluation method. The research achievements will provide valuable reference for development of DES in our country.