The Capacity Scale And Operation Strategy Of BCHP System Based On Optimization Research

As one kind of total energy system, BCHP combines heating,cooling and power,which is based on energy cascade utilization,it can improve energy utilization efficiency, at the same time, has good economy, energy saving and emissions reduction. The BCHP will be the trend of distributed energy supply system in the future, become one of the most development potential supply modes in the various countries.Taking the building meeting the load demand of cooling heating and power loads in the premise, the optimization design of cogeneration systems in order to achieve the best economic energy saving and emission reduction. In this paper, takes one building in Shanghai as an example, according to the energy balance and equipment performance characteristics of BCHP system, the equipment capacity allocation and operation optimization strategy in-depth research by using the optimization design theory.Firstly, this paper put forward the concept and classification of the emergency power. According to different kinds of emergency power principles, advantages or disadvantages are briefly described in the paper. Introduced a method to determine the size of the emergency power capacity, proposed a new strategy to determine the capacity scale of BCHP system, i.e. the generator capacity of BCHP engines are determined by emergency power capacity, and replaced the emergency power.Secondly, according to the optimization scheme method, establishes capacity allocation optimization method model of BCHP system, by economy,energy saving,emission reduction for the single best research objective function respectively. In this model, considered the building cooling,heating and power load on the basis of the typical day and equipment conditions such as the performance characteristics. The conclusion that research objective about capacity allocation of gas turbine is obtained. According to the capacity scale of gas turbine whether meet the emergency power supply requirements as the basis. If meet the requirements, it can replace emergency power completely; If not meet the requirements, according to the new capacity allocation, namely "the generator capacity is determined by emergency power capacity, and replaced the emergency power supply". The results show that the single objective function when economy,energy conservation or emission reduction is best respectively, the optimization of gas turbine capacity could meet emergency power.And saved both equipment investment and room area, also can improve the use function of gas turbine.Finally, this paper analyzed that weight coefficient of the economy,energy saving and emission reduction in-depth, which the weight coefficient changed, the sensitivity of the influence to the objective function, by using double objective function. The results show that the emissions reduction weight coefficient> energy saving weight coefficient> economic weight coefficient. According to the cooling,heating and power in the annual, takes the multi-objective of the economy,energy saving and emission reduction into the single objective optimization model through the weight coefficient. Though an example of the integrated target function optimization, the operation strategy about cooling,heating and power of the typical hourly load is obtained.