System and method for trapping carbon dioxide from flue gases in multi-stage manner

A technology of carbon dioxide and flue gas, applied in chemical instruments and methods, separation methods, separation of dispersed particles, etc., can solve the problems of low separation selectivity and low purity

Active Publication Date: 2013-05-01
GUODIAN NEW ENERGY TECH INST
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Problems solved by technology

Conversely, although activated carbon is not sensitive to water vapor, due to the l

Method used

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  • System and method for trapping carbon dioxide from flue gases in multi-stage manner
  • System and method for trapping carbon dioxide from flue gases in multi-stage manner
  • System and method for trapping carbon dioxide from flue gases in multi-stage manner

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Embodiment Construction

[0074] Embodiments will now be described with reference to the drawings.

[0075] The introduction of the two-stage pressure swing adsorption process used in the present invention can be found in figure 1 .

[0076] The parameters of the first-stage adsorption device, the operating parameters and the specifications of the adsorbents in the first and second-stage VSA are shown in Table 1. Among them, the first-stage VSA uses activated carbon as the hydrophobic adsorbent, and the second-stage VSA uses 13X zeolite molecular sieve as the active agent.

[0077] Table 1

[0078]

[0079] The operation steps and results of the first stage vacuum pressure swing adsorption are described as follows:

[0080] The first stage VSA uses a three-bed 9-step cycle, see figure 2 . The detailed operation process is as follows:

[0081] (1) In the first step, the No. 1 bed is subjected to the air intake step, and the No. 3 bed is subjected to the desorption step. Bed No. 2 is bye and i...

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Abstract

The invention relates to a system and a method for trapping carbon dioxide from flue gases in a multi-stage manner. The system comprises at least two groups of pressure swing adsorption devices; each group of pressure swing adsorption devices comprise at least one adsorbent bed; the adsorbent bed of the first-stage pressure swing adsorption device is made of hydrophobic adsorption material; the adsorbent beds of the other stages of pressure swing adsorption devices are made of carbon dioxide adsorption material; the method aims to allow the flue gases to pass through the system. The multi-stage VSA process is designed by simple circulation steps. In the first-stage step, the hydrophobic adsorption materials are adopted, so that the CO2 concentration is increased from 12 percent to 40-60 percent, and the CO2 recovery rate is guaranteed to be higher than 90 percent. After the first-stage operation is finished, most of steam directly penetrates the adsorbent beds to be discharged. In the other stage operation, 13X is adopted as an adsorbent, so that the CO2 is purified easily to achieve the purpose that the concentration is increased from 40-60% to more than 95%.

Description

technical field [0001] The invention relates to a system and method for capturing carbon dioxide in flue gas at multiple stages, in particular to a system and method for capturing high-humidity carbon dioxide in flue gas by using multi-stage vacuum pressure swing adsorption technology. Background technique [0002] Separation of CO from flue gas by vacuum swing adsorption (VSA) 2 In the process, activated carbon and 13X zeolite molecular sieve have been the most widely used adsorbent materials. If you compare the separation effect of activated carbon and 13X molecular sieve, because 13X has a higher CO 2 Adsorption capacity and high adsorption selectivity, 13X molecular sieve has better separation of CO 2 Effect. However, the presence of water vapor will contaminate 13X and lose its activity. [0003] In addition to the above two adsorbents, adsorbents such as talc-like materials and metal-organic frameworks (MOFs) are also research hotspots in recent years due to their ...

Claims

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Application Information

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IPC IPC(8): B01D53/047
CPCY02C10/08Y02C20/40
Inventor 徐冬郭桦彭妮·肖保罗·韦伯利翟玉春
Owner GUODIAN NEW ENERGY TECH INST
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