Patent ID: 6334332
Filing Date: 2002-01-01
Classification: B02C,B29B,B29L,F25B,F25D,Y02W

Abstract:
A low temperature waste crushing system having a low temperature freezing section for cooling material below its cold shortness transition temperature by receiving a supply of refrigeration from a heat sink and a crushing section for crushing the material cooled in the low temperature freezing section by taking advantage of cold shortness, whereinthe heat sink is configured as a binary refrigerating cycle combining two different refrigerating cycles, the first refrigerating cycle for obtaining a first refrigeration higher in temperature than the cold shortness transition temperature and the second refrigerating cycle for obtaining a second refrigeration lower in temperature than the cold shortness transition temperature, the low temperature freezing section is configured as a dual steps cooling section comprising a preceding and a succeeding step, each of which receives refrigeration of different temperatures; the preceding step of the dual steps cooling section is supplied with the higher temperature refrigeration of the first refrigerating cycle and the succeeding step is supplied with the lower temperature refrigeration of the second refrigerating cycle; the binary refrigerating cycle is cascaded and comprises a higher temperature condensing unit configured as the first refrigerating cycle which uses ammonia as refrigerant and a lower temperature condensing unit configured as the second refrigerating cycle which uses a hydrocarbon refrigerant, the higher temperature condensing unit supplies a part of the latent heat of vaporization of ammonia refrigerant to the load of the preceding step of the dual steps cooling section and at the same time introduces the remainder to the condensing part of the lower temperature condensing unit to make the condensing part a cascade condenser, and the lower temperature condensing unit supplies to the load of the succeeding step of the dual steps cooling section a low temperature brine cooled in a brine cooler to which the hydrocarbon refrigerant condensed in the cascade condenser is supplied.