Method for vacuum pressure and temperature varying coupling adsorbing and trapping carbon dioxide in flue gas

Abstract

The invention relates to a trapping method of carbon dioxide, namely a method for multi-tower vacuum pressure and temperature varying coupling adsorbing and concentrating the carbon dioxide. The method comprises the following main steps: (a) under the conditions of 10-50 DEG C of temperature and 1.1-5.0 atm of pressure, adopting an adsorbent for adsorbing the carbon dioxide to adsorb the carbon dioxide in flue gas; (b) under the conditions of 80-150 DEG C of temperature and 1-10 kPa of vacuum, desorbing the adsorbent in step (a), and cooling the obtained gas containing the carbon dioxide to enter a gas collector. The method has the advantages that under the auxiliary condition of heating temperature rising, the adsorbent is desorbed in vacuum, and the power consumption and the cost of vacuum equipment are reduced; pipe-shell absorbers or the absorbers of enhanced heat transfer elements of tower inbuilt fin type, coils, and the like to increase the indirect heating and cooling efficiency; and adopting low-temperature exhaust gas discharged from the top end of an adsorption tower to directly regenerate a post adsorbent in a bed to shorten the cooling time. Compared with the prior art, the method reduces the trapping and post processing cost of the carbon dioxide.

Description

technical field [0001] The invention relates to a method for capturing carbon dioxide (greenhouse gas), in particular to a method for capturing carbon dioxide in flue gas coupled with vacuum variable pressure and variable temperature. Background technique [0002] The fourth report issued by the Intergovernmental Panel on Climate Change (IPCC) of the United Nations Environment Program in early 2007 pointed out that climate warming is an undoubted fact, and more than 90% of the possibilities are that human activities have caused climate change. Global greenhouse gas emissions due to human activities have increased since industrialization, increasing by 70% between 1970 and 2004, and global atmospheric carbon dioxide (CO 2 ) concentration has increased from about 280ppm in the pre-industrial era to 379ppm in 2005, while CO emitted into the atmosphere 2 3 / 4 of that is caused by the burning of fossil fuels. Globally, 6 billion tons of CO per year must be avoided, according to ...

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Problems solved by technology

[0006] In view of this, there is an urgent need in the art for a novel method for capturing carbon dioxide in flue gas to overcome the CO present in the prior art. 2 The cost and energy consumption of adsorption capture are high, and because the captured CO 2 Defects such as increased post-processing (pressurized storage) costs caused by low purity (less than or equal to 75v / v%)

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