Study Of NG-CCHP And Chemical Solution Energy Storage Integrating System

Due to the huge consumption of buildings,energy conservation is unprecedented urgent.In order to conquer the matching question of conventional CCHP(combined cold,heat and power)system between energy supply and energy demand,and the poor efficiency question because of variable operating conditions,a novel gas fired CCHP system called chemical solution energy storage CCHP system is proposed based on chemical solution energy storage technology in this paper.The novel gas fired CCHP system consists of a gas turbine,an absorption refrigerator,a heat exchanger and a chemical solution energy storage unit.Key unit of the novel gas fired CCHP system is the chemical solution energy storage unit that using lithium bromide solution as the cold storage medium and refrigerant,that can realize functions of cool storage?cool discharge and refrigeration.There are four operating modes:cold storage mode?refrigeration/cold storage mode?refrigeration mode?refrigeration/cold release mode.The novel CCHP system and a reference system were simulated by ASPENPLUS and analyzed by thermodynamics analysis method and exergetic analysis method.The results indicate that comparing with traditional CCHP system,PER(primary energy rate)of the novel CCHP system was improved from 71.1%%to 85.4%,refrigerating capacity increase rate and exergy efficiency achieved to 61.2%and 41.1%respectively,and flue gas waste heat recovery rate reached 36%.For further analysis,a single factor sensitivity analysis is conducted to study the change regulation of thermodynamic properties,therefore the entrance flue gas temperature of the chemical solution energy storage unit was chose as the single factor.The results show that,within a certain range,improving the entrance flue gas temperature can improve refrigerating capacity increase rate and heat recovery rate.Improving the entrance flue gas temperature can improve exergy efficiency in refrigeration mode and refrigeration/cold release mode,on the contrary,reduce exergy efficiency in cold storage mode and refrigeration/cold storage mode.Improving the entrance flue gas temperature can improve primary energy rate in refrigeration/cold release mode,on the contrary,reduce primary energy rate in cold storage mode and refrigeration/cold storage mode.The novel gas fired CCHP system simply integrate conventional gas fired CCHP system with chemical solution energy storage unit,is able to recover waste gas deeply,improve refrigerating capacity,reduce the installed capacity of refrigerator,improve PER,stabilize operation parameters,improve equipment life cycle.The system integration method in the paper not only provides ideas for the energy systems integration,but also has a good market prospect.