Application Of CCHP For Hydrogen Production In Multiple Scenarios Based On Coupled Scenery

Renewable energy represented by wind and solar energy has significant characteristics such as volatility and intermittency,so how to improve the utilization rate of renewable energy has become a current research hotspot.In this paper,we build a comprehensive energy utilization system that couples wind and solar energy,CCHP system and PEM electrolyzer to produce hydrogen,and study various ways of hydrogen utilization by supplying gas network,hydrogen fuel cell and hydrogen refueling station,which has theoretical and practical significance in solving the problem of wind and light abandonment and realizing hydrogen utilization.Firstly,the system physical model of IES-pipe network is established,the constraints and objective functions are constructed based on the energy flow of the system,and the cooling,heating and electricity load data of residential buildings in Dalian are simulated and used as a case study for programming optimization.The hydrogen production of the system on three typical days was analyzed,and the hydrogen cost of two supply users was calculated and analyzed.By analyzing the optimization data results,the design system increased the equipment cost,but the introduction of hydrogen production link can make for the system benefit,make cost saving,and at the same time can achieve carbon emission reduction and energy saving,which verified the feasibility of the model.Secondly,the IES-hydrogen fuel cell physical model was established,the hydrogen production,storage and use modules were analyzed,and a mathematical model was established to optimize the solution according to the energy flow of the system.The CCHP system,scenic CCHP without hydrogen production system and the design system were selected for comparison.The optimization results were analyzed for cold,hot and electric hydrogen balance,and the results showed that the hydrogen production link can effectively use the waste electricity,and the hydrogen fuel cell plays a role in the system to fill the power gap and cut the peaks and fill the valleys.By calculating the evaluation indexes,the design system has advantages in primary energy saving rate,CO₂ reduction and cost saving rate.Finally,an IES-hydrogen refueling station model was constructed to make an optimized design of the system,compare the hydrogen cost of two modes of hydrogen production in the station and hydrogen supply outside the station,do sensitivity analysis on the scale of hydrogen refueling station,fan capacity,and different building types,and evaluate the primary energy saving rate,CO₂ reduction rate,and cost saving rate of the designed system.These three design models were analyzed and compared to derive the advantages and disadvantages of each design system and provide solutions for the future development of energy systems.