Method and system for removing carbon dioxide from reaction gas, and use thereof
AssigneesChina Petroleum & Chemical Corporation, Sinopec Nanjing Research Institute of Chemical Industry Co., Ltd.
InventorsXiangyun Wang, Haitao Li, Ye Zhang, Li Xu, Yunsheng Zhao, Xiaolian Wu, Pinhua Yu
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Abstract
The present invention discloses a method for removing carbon dioxide from a reaction gas. The present invention fully utilizes the available heat in each part of the carbon dioxide removal system to reduce external heat exchange, and thereby significantly reduces the carbon dioxide content in the gas returned to the reactor, and also greatly reduces the steam consumption during the regeneration of the rich decarburizing solution. The present invention also discloses a system for removing carbon dioxide from the reaction gas and use thereof.
Claims11
A method for removing carbon dioxide from a reaction gas, comprising:
- S1.performing a heating treatment on a reaction gas from which carbon dioxide is to be removed by heat exchanging the reaction gas with a washing water and a regeneration gas;
- and the step S1 comprises the following steps:
- 1A. dividing the reaction gas from which carbon dioxide is to be removed into a gas stream I and a gas stream II;
- 1B. heating the gas stream I by heat exchanging with a regeneration gas exiting from a top of a regeneration tower to obtain a gas stream Ia;
- 1C. heating the gas stream II by heat exchanging with the washing water to obtain a gas stream IIa;
- and
- 1D. mixing the gas stream Ia with the gas stream IIa to obtain the gas stream III;
- S2. performing a decarbonizing treatment on the gas stream III obtained in step S1 by using a decarburizing solution to obtain a gas stream IV;
- and
- S3. cooling the gas stream IV to obtain a CO2-removed purified gas,
- wherein the washing water is first cooled by a cooling device, then exchanges heat with the gas stream IV, subsequently exchanges heat with the decarburizing solution, finally exchanges heat with the reaction gas from which carbon dioxide is to be removed, and after that returns to the cooling device for cooling circulation.
Dependencies are inferred from the claim text.