CO2 separation and compression integrated method

Abstract

The invention discloses a CO2 separation and compression integrated method which belongs to the technical field of gas preparation and is used for separating CO2 from gases containing the CO2. The invention improves the phase-transition temperature of CO2 through combining multi-stage compression, multi-stage cooling and multi-stage separation and improving the pressure of gas mixture, ensures a certain separation ratio by adopting a multi-stage separation and multi-stage compression way, and separates most of CO2 in a liquid form from the gas mixture under relatively higher condensing temperature, thereby improving the low-temperature condensing separation method of the CO2, and greatly lowering the energy consumption of recovering the CO2; meanwhile, the whole process does not adopt a chemical solvent, therefore, the lost of equipment is low, the safety is high, and the operation and maintenance cost is greatly lowered. The invention can be widely applied to separate the CO2 from thegas mixture containing the CO2, can produce pure-CO2 products and reduce the emission of greenhouse gases, thereby protecting the human habitat.

Description

technical field [0001] The invention belongs to the technical field of gas preparation, in particular to a CO 2 Separation compression integration method. Background technique [0002] CO 2 It is an important component of greenhouse gases. CO in the process of energy utilization 2 The capture and storage of CO2 is considered as a way to reduce CO 2 Feasible technologies for emissions. However, unlike other environmental pollutants such as sulfides and nitrogen oxides, CO 2 The chemical properties are stable, and the amount that needs to be processed is large, so although the relevant physical and chemical methods can realize CO 2 separation and recovery, but the energy consumption and investment in the separation and recovery process are very high, so that the CO 2 The cost of abatement is too high. [0003] Separation of CO during energy utilization 2 The main technologies are: absorption technology (including chemical absorption and physical absorption), adsorptio...

AI Technical Summary

Problems solved by technology

while CO 2 In a gas with a lower boiling point (such as H 2 、CH 4 etc.) CO after mixing 2 The phase transition temperature will be significantly lowered in CO 2 CO at lower concentrations 2 The phase transition temperature will even drop below -100°C, at which point the phase transition temperature of CO2 is already lower than that of pure CO 2 The triple point temperature (-56.6°C), so there may be CO 2 The problem of freezing equipment with solid precipitation, and the energy consumption of this low-temperature cryogenic process is huge

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