Carbon dioxide industrial-scale separation and purification system and method in mixture gas by hydrate method

Abstract

The invention discloses a system and a method for industrially separating and purifying CO2 in mixed gas by a hydrate method. The system consists of a feed gas pretreatment system, a hydrate separation tower, a micro-bubble jet-loop reaction system, a column bottom hydrate decomposition system, a CO2 product collection system, a hydrate formation and decomposition heat comprehensive utilization system and a tail gas energy recovery system. The method integrates hydrate bubbling reaction technology, spraying reaction technology and micro-bubble jet reaction technology, adopts CO2 reflux displacement fractionation technology to improve the concentration of the CO2 in a hydrate phase, has simple separation technology and device and high separation rate and efficiency, comprehensively utilizes the formation heat and decomposition heat of the hydrate during refrigeration cycle, simultaneously recovers compression work of tail gas and cold energy for feed gas pretreatment, and has low energy consumption and cost during separation. The system and the method can be applied to industrial and continuous separation and purification of the CO2 in the mixed gas such as flue gas (CO2 / N2), IGCC synthetic gas (CO2 / H2), biomass synthetic gas (CO2 / H2), natural gas (CO2 / CH4), coalbed gas and the like.

Description

technical field [0001] The present invention relates to a kind of CO in mixed gas 2 Industrial separation and purification technology, especially one that utilizes CO 2 Hydrate process separation and purification of CO in mixed gas 2 Industrialized separation system and method. Background technique [0002] Global warming and the greenhouse gas CO 2 Emission reduction is currently a hot and difficult issue of global concern. The Chinese government's 2010 greenhouse gas emission reduction target is 1 billion tons. Emission reduction is imperative and has a long way to go. Atmospheric CO 2 The rapid increase in concentration mainly comes from the large-scale energy production emissions in industry and CO emissions from power generation. 2 accounted for global CO 2 More than 37.5% of total emissions are CO 2 The focus of emission reduction. my country is a country where coal is the main energy source, and this energy structure will not change for a long time in the futu...

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Problems solved by technology

However, the above method also has certain shortcomings, mainly in the use of three-stage separation, the number of separation equipment is large, the investment is large, and the flow process of the gas, liquid, and solid three-phase system in the system under high pressure is complicated and difficult to control. It is not conducive to energy saving and comprehensive utilization of energy, etc.

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