Optimal Design And Research Of Natural-gas Combined Cooling Heating And Power System

With the economic development of society,there is a growing demand for energy,but the amount of fossil fuel is limited,the problem of energy shortage has become the first issue that many countries need to face.The combined cooling heating and power(CCHP)system is designed to alleviate and solve the problem of energy shortage,the CCHP system follows the principle of "Allocated appropriately,Required for each,matched the temperature,and cascading utilization",Using the input energy as much as you can.Natural gas combined cooling heating and power system is the mainstream distributed energy system.The energy generated by natural gas combustion can be used for power generation,cooling and heating.The comprehensive utilization of primary energy of CCHP system is up to 80%,far more than 35% of traditional power grid.Meanwhile,it also has great advantages in environmental protection.Therefore,the research on the rational allocation and optimal operation of CCHP system is of great significance for solving the energy problem in China.Firstly,using DeST software,a hotel in Dalian is simulated and the cooling,heating and electricity loads of hotel are calculated hourly in the whole year.Meanwhile,the equipment involved in the combined CHP system is confirmed.Secondly,based on the optimal goal of energy efficiency,economy and environmental,the optimization model of energy analysis,economic operation and environmental effective is established.And two different optimal operation plan of "annual comprehensive optimization" and "sub-season optimization" are designed.Under certain constraints,Then the best equipment configuration can be obtained by GA.The optimization results are analyzed from energy saving,economic and environmental viewpoint.Finally,it is found that the actual operation can choose "annual comprehensive optimization" as the running plan;However,focusing on the economy or energy saving points,the "season optimization" can be chosen as the running plan.The comprehensive evaluation results can provide reference for the actual operation of the combined CHP system.Because of electricity price and natural gas price are not always confirmed,and the state has subsidized policies for CCHP system.Thus,the design mainly operates the sensitivity analysis on the optimization results of the system,and mainly analyzes the impact of natural gas price and electricity price on the comprehensive evaluation coefficient.