Device for recovering dry ice gaseous phase through ammonia heat pump refrigeration and production method

Abstract

The invention belongs to a device for recovering dry ice gaseous phase through ammonia heat pump refrigeration and a production method. The device comprises a carbon dioxide raw material liquid storage tank, the carbon dioxide raw material liquid storage tank is connected with a carbon dioxide inlet of a dry ice manufacturing machine, a dry ice outlet of the dry ice manufacturing machine is connected with a dry ice heat preservation box, and a carbon dioxide gaseous phase outlet of the dry ice manufacturing machine is connected with the carbon dioxide inlet of the dry ice manufacturing machinethrough a carbon dioxide booster compressor, a high-efficiency oil remover, and an evaporator tube pass sequentially; an outlet of a screw type refrigerating compressor is connected with an inlet ofthe screw type refrigerating compressor through a condenser tube pass, a liquid storage device, tee joints, an economizer shell pass and an evaporator shell pass sequentially; and the third end of thefirst tee joint is connected with an air supply opening of a heat pump refrigeration ice machine through a third regulating valve and an economizer tube pass. The device has the advantages that the technological processes are simple, the operation is simple and convenient, the running is stable, the energy consumption is low, the running is safe and reliable, the product unit power consumption islow, the production cost is reduced, and the quality is unchanged.

Description

technical field [0001] The invention belongs to the technical field of dry ice production, and in particular relates to a device and a production method for recovering the gas phase of dry ice by refrigeration with an ammonia heat pump. Background technique [0002] Dry ice is solid carbon dioxide. It has a low temperature of -78.5°C. It absorbs heat and sublimates into a gas. It is odorless, non-toxic, and has no residue. It has the effect of inhibiting bacterial reproduction. It is widely used in abrasive tool industry cleaning, petrochemical power, food and pharmaceutical industries, Printing industry, automobile and shipbuilding industry, refrigerated transportation field and fire protection field, etc. To produce dry ice from liquid carbon dioxide, it must be cooled first. There are two main methods: one is the external heat removal method, that is, under a certain pressure, the liquid carbon dioxide is cooled to a temperature lower than the triple point by contacting t...

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Problems solved by technology

The other is the internal heat removal method, which is to evaporate part of the carbon dioxide and take away part of the heat, so that the remaining carbon dioxide continues to cool and solidify into dry ice. This method is currently the method of industrial production of dry ice commonly used; In the production process of making dry ice, the advantages include less equipment, easy operation, simple process, convenient maintenance, and good product quality. However, if there is no gaseous carbon dioxide recovery device, each ton of dry ice needs to consume as much as 4-5 tons of liquid carbon dioxide, which increases the production cost of dry ice

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