A Novel Combined Cooling Heating And Power System With Chemical Recuperation Process Of Methanol Decomposition

With the energy shortage,environmental pollution and other problems becoming increasingly serious,the combined cooling,heating and power system(CCHP)has been considered to be the most effective route to solve these troubles due to the huge advantages in energy saving and emission reduction.Supported by the National Natural Science Foundation of China,this paper proposes a chemical recuperation method based on methanol decomposition reaction to solve the problems of large irreversible loss and low efficiency in the process of power waste heat utilization,and provides some suggestions for the efficient recovery of power waste heat in CCHP systems.Firstly,this paper proposes a novel CCHP system with chemical recuperation process of methanol decomposition,thermodynamic modeling and performance analysis are carried out for the key processes,and the system design conditions are also simulated.Secondly,the system performance of design conditions is analyzed according to the first and second law of thermodynamics.It can be concluded that this system has higher fuel saving rate and exergy efficiency,achieving the efficient recovery and utilization of power waste heat.In addition,the change of system performance under variable load of internal combustion engine,the heat and mass transfer process of chemical recuperation reactor are studied and analyzed,which points out the direction for the reactor optimization design and system integration optimization.At last,based on the analysis of heat and mass transfer process of chemical recuperation reactor,the effects of methanol feed rate and temperature,reactor diameter ratio and diameter height ratio,reaction activation energy on the temperature and reaction field of reactor as well as the performance of the whole CCHP system are investigated,which realizes the reactor optimization design and system integration optimization.