Proposal and Analysis of a Cogeneration System Integrating High Temperature Gas-cooled Reactor with Ammonia-water Cycle

摘要

A nuclear ammonia-water power and refrigeration cogeneration system(NAPR)with zero CO2 emission has been proposed and analyzed in this paper.It consists of a high temperature gas-cooled reactor(HTGR)closed Brayton cycle and a modified ammonia water power/refrigeration combined cycle(APR).The HTGR is an inherently safe reactor,and thus could be stable,flexible and suitable for various energy supply situation.The helium working medium in HTGR need not discharge,so the exhaust waste heat could be recovered more thoroughly.The ammonia water adopted as working fluid in bottoming cycle makes the exergy destruction in heat exchange and absorption-condensation processes decrease; and the concentrated ammonia solution was throttled to provide refrigeration.With the HTGR of 200MW thermal capacity and 900°C/70bar outlet parameters,the system attains an exergy efficiency of 64.4％.Compared with the nuclear combined cycle(NCC)with the same nuclear energy input,the exergy efficiency of NAPR in Comparison caseⅠcould reach up to 2.6％-points higher than that of NCC(72.5％VS 69.9％).With same flow path of ammonia solution working medium,NAPR achieves 4.9％-points higher than that of original APR cycle(62.5％VS 57.6％).The fossil fuel saving(based on CH4)and CO2 emission reduction of base-case NAPR are found to be～8.5×104t/y CH4 and～2.3×105t/y CO2,respectively.The system integration accomplishes the safe and high-efficiency utilization of nuclear energy by power and refrigeration cogeneration.