Carbon dioxide purifying apparatus

Abstract

The invention belongs to the technical field of gas purification and discloses a carbon dioxide purifying apparatus, comprising a liquid storage tank, a vaporizer, an adsorbing column unit, a liquefaction plate exchanger, a rectifying column, a reboiler and a freezing unit. The liquid storage tank, the vaporizer, the adsorbing column unit and the rectifying column are connected in sequence througha gas pipeline; the condenser is arranged above the rectifying column; the reboiler is connected with the rectifying column and positioned below the same; the liquefaction plate exchanger is positioned between the adsorbing column unit and the rectifying column; the freezing unit is connected with the condenser through a refrigerant incoming pipe and a refrigerant return pipe. An adsorbent / catalyst used herein has high adsorbing / catalyzing efficiency such that the requirement on production efficiency can be met; the refrigerant herein is fully utilized, emptying gas can also precool raw gas as required, resources are fully utilized, and energy consumption can be reduced; the carbon dioxide purifying apparatus is suitable for producing high-purity carbon dioxide 99.999% and even 99.9995% in purity.

Description

technical field [0001] The invention relates to the technical field of gas purification, in particular to a carbon dioxide purification device. Background technique [0002] Carbon dioxide is a colorless, odorless, non-toxic, non-flammable gas with a gas density of 1.976kg / m 3 , liquid density 929.5kg / m 3 , the molecular weight is 44.01, the critical temperature is 31.4°C, and the critical pressure is 7.28MPa. The gaseous carbon dioxide can be liquefied directly when it is pressurized or cooled, and solid dry ice can be obtained when the carbon dioxide is depressurized and throttled. The direct sublimation of solid dry ice can generate gaseous carbon dioxide. It is 0.518mpa, and when the temperature is -56.6°C, three phases of gas, liquid and solid coexist. [0003] Although carbon dioxide is well-known as a greenhouse gas that affects the climate, carbon dioxide is also an important carbon resource, which is widely used in many fields such as chemical industry, machinery,...

AI Technical Summary

Problems solved by technology

Chinese Patent Announcement No. CN106430194A, the authorized announcement date is February 22, 2017, announced an invention patent named Gaochun carbon dioxide purification equipment, its carbon dioxide purification channel passes through the liquefier, catalytic bed, adsorption bed, precooler, and finally Connected to the rectification tower, the invention purifies carbon dioxide through catalytic oxidation, adsorption and rectification of carbon dioxide, but it also has a big problem. The catalytic oxidation process is before the adsorption process, which will cause excessive working pressure of the catalytic bed and cause catalyst consumption. The increase will also lead to the deterioration of the overall purification effect. In addition, in the first catalysis and then adsorption treatment process, some impurities in the raw materials may cause catalyst poisoning, etc., making the purification effect worse.

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