Device for enriching and recovering carbon dioxide gas

Abstract

The invention relates to a device for enriching and recovering carbon dioxide gas, which belongs to the technical field of gas separation. The invention is characterized in that the device comprises a gas heat exchanger, a manifold, an absorption tower, an adsorption tank, a flash tower, a vacuum pump, an intermediate storage tank, a barren liquor pump, an ammonia cooler and a compressor, and the solvent adopted by the device is polyethylene glycol dimethyl ether (NHD) in which a corrosion inhibitor, an anti-degradation agent and an anticoagulant are added. The NHD adopted by the invention has high utilization rate, simple process and low energy consumption, and is suitable for the enrichment and recovery of carbon dioxide in gas sources with higher pressure for producing hydrogen, natural gas, conversion gas, synthesized ammonia gas, methanol synthesis gas and the like. The invention has the advantages that the conventional NHD process is improved, the preparation recovery concentration of the carbon dioxide can reach more than 98%, and the application prospect is broad.

Description

technical field [0001] The invention belongs to the technical field of gas separation, and relates to a device for enriching and recovering carbon dioxide gas. Background technique [0002] The greenhouse effect caused by the massive emission of carbon dioxide has made the earth's climate environment increasingly worse. The convening of the "Copenhagen Climate Conference" indicates that the reduction of carbon dioxide emissions has reached an imminent level. However, at present, the main energy consumption in the world is still fossil energy, and no clean energy that can be completely replaced has been found. Therefore, slowing down the emission of carbon dioxide is the main task at this stage, and the separation, recovery, storage and utilization of carbon dioxide are a key to control carbon emissions. proven method. [0003] The separation and recovery methods of carbon dioxide mainly include: absorption method, adsorption method, membrane separation method and so on. A...

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Problems solved by technology

[0005] Utility model patent ZL200820069819.3 provides a process device for recovering carbon dioxide in flue gas using NHD as a solvent. This device will introduce more water in the desulfurization and regeneration process, which will reduce the absorption efficiency of NHD solvent for carbon dioxide

[0006] Invention patent ZL200310106564.5 provides a high-pressure method for removing sulfide and carbon dioxide. In this process, a desulfurization tower and a stripping tower are also used, and a large amount of water will also be introduced; Corrosion of equipment, degradation of solvents, and condensation of solvents limit its application for carbon dioxide enrichment and recovery to a certain extent.

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