Purification and recovery system of carbon dioxide in industrial tail gas

Abstract

The invention provides a purification and recovery system for carbon dioxide in industrial exhaust gas, including a purification subsystem. The raw material gas containing CO2 enters the purification subsystem after being captured and compressed; the purification subsystem includes a desulfurization unit; the desulfurization unit includes at least two-stage desulfurization modules. and regeneration module. The mixture of raw gas and desulfurizer is transported to the first-level desulfurization module. The outlet of the last-level desulfurization module is the desulfurization gas outlet of the desulfurization unit; the desulfurization agent rich liquid outlet of each level of desulfurization module is connected with the regeneration module. The liquid inlet of the regeneration module is connected to the liquid inlet of the regeneration module, and the liquid outlet of the regeneration module is connected to the feed inlet of the other desulfurization modules except the first-stage desulfurization module. In the present invention, various links are improved and designed to make full use of the energy generated by the recycling system itself for reuse, reduce energy consumption, and reduce system operating costs.

Description

Technical field [0001] The invention relates to the technical field of industrial tail gas purification and recovery, and in particular to a purification and recovery system for carbon dioxide in industrial tail gas. Background technique [0002] In the existing industrial exhaust gas, the content of carbon dioxide is very high. Because carbon dioxide is stable and chemically inert, it cannot be removed by photochemical or chemical action. Therefore, carbon dioxide is the main factor of the greenhouse effect. Therefore, in the treatment of industrial raw gas In China, the purification of carbon dioxide is also a top priority. At the same time, because carbon dioxide is also widely used, it can be used in polymer materials, gas fertilizers, dry ice, carbon dioxide fire extinguishers, refrigerants and other fields. Therefore, recycling the carbon dioxide in the industrial feed gas is a measure that must be taken in China's energy shortage environment. [0003] In industrial exhaust...

AI Technical Summary

Problems solved by technology

At present, most of the desulfurizers are mixed with exhaust gas for desulfurization. Therefore, a lot of desulfurizer waste liquid is produced. At present, the treatment of desulfurizer waste liquid is mostly offline regeneration, and the regeneration process cannot be generated according to different stages of desulfurization units. The desulfurizer waste liquid is treated differently, resulting in energy waste

[0004] At the same time, in the existing carbon dioxide recovery and utilization system of industrial tail gas, the energy generated inside the recovery and utilization system cannot be reused, resulting in high operating costs of the system

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