Direct freezing device for liquid carbon dioxide

Abstract

The invention relates to a direct freezing device for liquid carbon dioxide. The direct freezing device comprises a high-temperature section refrigerating system and a low-temperature section refrigerating system which are formed through overlapping of overlapped condensers. The high-temperature section refrigerating system comprises a high-temperature section compressor, a high-temperature section condenser, a high-temperature section throttle valve and the overlapped condenser, all of which are connected through a pipeline A. The low-temperature section refrigerating system comprises a low-temperature section compressor, the overlapped condenser, a low-temperature section storage tank, a cut-off valve A, a low-temperature section throttle valve, a freezing device and a cut-off valve B which are connected through a pipeline B. A carbon dioxide direct freezing evaporator is arranged in the freezing device, and emptying valves and a vacuum pump are connected to the exterior of the freezing chamber. The direct freezing device has the beneficial effects that a hole plate is arranged at the upper end of the carbon dioxide direct freezing evaporator, liquid supplying of the carbon dioxide direct freezing evaporator is mainly achieved through the hole plate, and the liquid carbon dioxide in the whole direct freezing area is even; and the quick freezing speed is high, the quick freezing time is shortened, and the quick freezing period is accelerated. A flow guiding partition plate is arranged at the tail end of the hole plate, the utilization rate of carbon dioxide is effectively increased, and the gas-liquid separation effect is improved.

Description

technical field [0001] The invention relates to a direct freezing device, in particular to a liquid carbon dioxide direct freezing device. Background technique [0002] In recent years, due to the need of environmental protection, the chlorofluorocarbon series of artificial refrigerants that seriously damage the ozone layer have been gradually banned, and the use of efficient and environmentally friendly natural refrigerants for corresponding refrigeration systems has become a research hotspot in the field of refrigeration at home and abroad. For the food quick-freezing industry, a large amount of refrigeration equipment is required, and the refrigeration medium is required to be safe and have a low evaporation temperature. It is not yet possible to find a suitable refrigerant that can achieve a better quick-freezing effect with single-stage or multi-stage compression. Therefore, people began to study the development of cascade refrigeration cycle and equipment. [0003] Tr...

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Problems solved by technology

[0003] Traditional cascade refrigeration equipment uses R404A / CO 2 Refrigeration cycle, R404A is a ternary near-azeotropic mixed refrigerant, CO 2 It is carbon dioxide refrigerant, and the whole equipment has perfect freezing steps, but the design of the freezing device is unreasonable, the utilization rate of the inflowing carbon dioxide is relatively low, and the quick-freezing effect is poor. Good new direct freezing equipment

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