A device and production method for producing food-grade CO2 using nh3/co2 cascade refrigeration

Abstract

The invention belongs to a kind of adopting NH 3 / CO 2 Cascade refrigeration produces food grade CO 2 A device and a production method; comprising a compressor connected to a feed gas pipeline, the outlet of the compressor is connected to the first feed gas inlet of the first flash tower through a drier, and the gas phase outlet at the top of the first flash tower is connected to the first tee through a first tee The first raw material gas inlet of the second flash tower is connected, and the liquid phase outlet at the bottom of the second flash tower is connected with food grade CO 2 The storage tanks are connected; it has the advantages of being able to reduce the energy consumption of food-grade carbon dioxide produced by the same type of raw material gas by 10%, and the emission content of carbon dioxide in the tail gas to less than 60%.

Description

technical field [0001] The invention belongs to the production field of food-grade carbon dioxide, in particular to a 3 / CO 2 Cascade refrigeration produces food grade CO 2 device and production method. Background technique [0002] At present, food-grade carbon dioxide production technology mainly adopts compression, liquefaction and rectification. The specific process raw material gas is first compressed and dried to remove moisture and impurities, and then enters the desulfurization tower (including organic sulfur and inorganic sulfur) to remove sulfide, and then Enter the purification tower for catalytic oxidation to remove organic components such as hydrocarbons, and finally use rectification to obtain food-grade carbon dioxide products. This process is a traditional food-grade carbon dioxide production process. The process technology is mature and reliable, and some domestic enterprises are using it. However, the technical route is complex, with many equipments and...

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Problems solved by technology

However, the technical route is complex, with many equipments and a large floor area. Liquid ammonia is used as the refrigerant for refrigeration, so the product yield is low and the energy consumption is high. According to the difference in raw gas components, this process technology can be extended Food-grade carbon dioxide is produced by direct distillation after compression. This process occupies a small area and is simple. Compared with traditional processes, energy consumption and product yield have been improved, but the emission content of carbon dioxide in the tail gas is still relatively high, ranging from 65 to Between 75%, in the food-grade carbon dioxide production technology, there is still a lot of room for improvement and improvement in the product extraction rate and product energy consumption of carbon dioxide

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