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 tail gas.The purification and recovery system comprises a purification subsystem.Raw gas containing CO2 is captured and compressed and then enters the purification subsystem.The purification subsystem comprises a desulfurization unit.The desulfurization unit comprises at least two stages of desulfurization modules and a regeneration module.A mixture of the raw gas and a desulfurizer is conveyed into the first-stage desulfurization module, and a gas outlet of the last-stage desulfurization module serves as a desulfurized gas outlet of the desulfurization unit.Desulfurizer rich liquor outlets of all the stages of desulfurization modules are connected with a liquor inlet of the regeneration module, and a liquor outlet of the regeneration module is connected with feeding ports of all the desulfurization modules except the first-stage desulfurization module.According to the purification and recovery system, improved design is conducted for all links, and energy generated by the system is fully utilized and recovered for recycling, so that energy consumption is reduced, and the operating cost of the system is reduced.

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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