Hot-gas defrosting method and hot-gas defrosting and refrigeration cycle method

Abstract

The invention provides a hot-gas defrosting method. The hot-gas defrosting method can be applied to a hot-gas defrosting system. The hot-gas defrosting system comprises a hot gas pipeline, an evaporation device, a liquid discharging device, an intermediate pressure vessel and a low-pressure circulating barrel, wherein the hot gas pipeline, the evaporation device, the liquid discharging device, the intermediate pressure vessel and the low-pressure circulating barrel are connected in sequence. The hot-gas defrosting method comprises the steps that the hot gas pipeline conveys high-temperature gas to the evaporation device so as to melt frost on the evaporation device, and the high-temperature gas and the frost on the evaporation device conduct heat exchange, and then are turned into liquid; and the liquid discharging device discharges the liquid into the intermediate pressure vessel to conduct depressurization, and the liquid is conveyed to the low-pressure circulating barrel through the intermediate pressure vessel. According to the hot-gas defrosting method, the mode that the liquid is discharged into the intermediate pressure vessel is adopted, the liquid discharging effect and the defrosting effect are good, the situation that due to the fact that the liquid in the evaporation device is discharged into the low-pressure circulating barrel through a low-pressure gas return pipe, the phenomenon of liquid explosion of the low-pressure gas return pipe is possibly caused is avoided, and the operating safety of the system is facilitated. The invention further provides a hot-gas defrosting and refrigeration cycle method.

Description

technical field [0001] The invention relates to the technical field of refrigeration, in particular to a hot gas defrosting method, a hot gas defrosting method and a refrigeration cycle method. Background technique [0002] Hot gas defrosting is a method of using hot gas to melt the frost layer on the evaporator. The specific use process is: first interrupt the liquid supply of the evaporator and close the return air port of the evaporator coil, and then provide high-pressure gas to use the inside of the evaporator coil. The high pressure and high-pressure gas melt the frost layer on the surface of the evaporating coil. [0003] At present, the refrigeration system in the cold chain logistics cold storage adopts the hot gas defrosting method is the most common, because in addition to being economical, practical and energy-saving, the hot gas defrosting method can be recycled because the hot gas is a by-product of system operation. [0004] However, in the way of hot gas def...

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Problems solved by technology

[0006] The embodiment of the present invention discloses a hot gas defrosting method to solve the problem of poor defrosting effect of the current hot gas defrosting method and the liquid explosion easily caused by directly discharging the liquid in the evaporator into the low-pressure return air pipe and the low-pressure circulation barrel and greater energy consumption

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