Device for producing food-grade CO2 through NH3/CO2 cascade refrigeration and production method

Abstract

The invention belongs to the field of a device for producing food-grade CO2 through NH3/CO2 cascade refrigeration and a production method. The device comprises a compressor which is connected with a raw material gas pipeline, an outlet of the compressor is connected with a first raw material gas inlet of a first flash tower through a drier, a gas phase outlet at the top of the first flash tower is connected with a first raw material gas inlet of a second flash tower through a first tee, and a liquid phase outlet at the bottom of the second flash tower is connected with a food-grade CO2 storage tank. The device and the production method have the advantages that the energy consumption for producing the food-grade carbon dioxide through the same-type raw material gas can be reduced by 10%, and the emission content of the carbon dioxide in tail gas can be reduced to 60% or below.

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 sulfides, 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 an...

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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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