Performane And Optimal Operation Analysis Of CCHP System With Gas Turbine

CCHP is a cogeneration system that can accomplish the production of cooling, heating, and power at the same time by making use of both the electrical and "waste" heat discharged from gas turbine unit. In contrast to the conventional system, it can use energy-resources more efficiently, creating opportunities for reduction both in purchased energy costs and in environmental impact. Using natural gas as primary energy for CCHP system is the best choice to achieve building energy-saving and to efficiently utilize natural gas. The combined cooling, heating and power (CCHP) system is broadly identified as an alternative for the world to solve energy, economic and environmental problems. Generations systems, driven by gas turbine, gas engine and fuel battery, have been applied to combined cooling, heating and power system (CCHP) in developed countries like USA, UK and Japan.Just under this background, firstly, this paper introduced the basic concept and configuration models of CCHP system, to determine the research object of this paper. Then based on a gas turbine cogeneration system, the main parts and equipments characteristics of MT-CCHP are summarized and introduced. So based on the energy balance and performance characteristics of cogeneration system, the influence of heat recover ratio, secondary combustion rate and electrical energy use for cooling in the amount, taste and saving of energy is studied in this paper. The results show that: for the amount of energy, increasing heat recover ratio, electrical energy use for cooling is negative, while under certain conditions increasing the secondary combustion rate is beneficial; for the taste and savings of energy, increasing heat recover ratio is beneficial, increasing the electrical energy use for cooling and secondary combustion rate is negative to the use of energy.Secondly, this article also according to the optimization design theory, in view of two different operation pattern, the "set heat by electric" and the "mixed mode", the performance parameters of the power generation, cooling and heating equipment are used for the constraint of the optimizing. An integrated optimization model of CCHP system on micro gas turbines is established. The optimization model is solving by applying the pattern search method and taking the minimal operation cost meeting the annual load demand of cooling, heating and power as optimizing function. And compared with comparison system, this paper analyzes the advantage of CCHP system in the economy, energy saving and environmental. Finally, according to the optimal system allocation has been obtained, analyzes the influence of the electricity price, natural gas prices change on CCHP system. The results show that: the CCHP system uses "mixed mode" strategy have more advantage in terms of the economy, energy conservation and environmental protection. When a CCHP system is completed, price fell, its economy is not affected, energy conservation and environmental protection become poor, but still better than comparison system. And the electricity price rise, the energy conservation and environmental protection will not be affected, economy is better. Natural gas prices fell, the energy conservation and environmental protection will not be affected, economy is better. Natural gas price rise, the energy conservation, economy and environmental protection become poor.