A high-efficiency energy-saving rectification and purification system for carbon dioxide

Abstract

The invention discloses an efficient and energy-saving system for rectifying and purifying carbon dioxide, and belongs to the technical field of chemical engineering equipment. According to a carbon dioxide rectifying and purifying process, the system comprises a drying adsorption tower, a liquefier and a purifying tower which are connected in sequence, and further comprises a renewable electric heater and a heat exchanger, wherein the renewable electric heater is connected with a noncondensable gas discharging pipe at the top of the purifying tower; a high-temperature renewable gas pipe of the renewable electric heater and a gas outlet pipe of the drying adsorption tower are respectively connected with the heat exchanger; an outlet of the heat exchanger is connected with a heating coiled pipe at the bottom of the purifying tower; a gas outlet of the heating coiled pipe is connected with a gas inlet of the liquefier. The carbon dioxide rectifying and purifying system simplifies a de-hydrocarbon procedure, i.e. three sets of equipment for de-hydrocarbon are all eliminated; hydrocarbon impurities and nonconcensable gas such as nitrogen and oxygen are removed together in the purifying tower; meanwhile, inside and outside of a liquid phase part of the purifying tower are indirectly heated, so that the carbon dioxide purifying efficiency is improved.

Description

technical field [0001] The invention relates to the technical field of chemical equipment, in particular to a system for high-efficiency energy-saving rectification and purification of carbon dioxide. Background technique [0002] The existing carbon dioxide purification method: the carbon dioxide raw material gas with a content ≥ 96% is compressed and boosted, water removal, desulfurization, dehydrocarbonation, drying, liquefaction, rectification, supercooling, storage and other processes, and the indicators of the final product liquid carbon dioxide reach National standard food grade carbon dioxide standard. Among them, the existing dehydrogenation technologies all use high-temperature catalytic oxidation combustion to remove hydrocarbons such as methane, ethane, propane, and benzene in carbon dioxide gas. [0003] The disadvantages of existing dehydrocarbonation methods are: [0004] Three pieces of equipment are required: preheater, decarburizer, and cooler, worth abou...

AI Technical Summary

Problems solved by technology

[0008] The invention provides a high-efficiency and energy-saving rectification and purification system for carbon dioxide, which solves the problems of complex and large equipment investment in the existing carbon dioxide purification process

Images