Method and device for separating high-purity CO2 from CO2-containing raw gas

A raw gas, high-purity technology, used in separation methods, dispersed particle separation, chemical instruments and methods, etc., can solve the problems of reducing the use efficiency of adsorbents, large compression energy consumption, large pressure drop, etc., to overcome the use of adsorbents. Low efficiency, overcoming the effect of high energy consumption of vacuum pump and huge economic value

Active Publication Date: 2018-07-03
戴莫尔科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, a disadvantage of this step is that carbon dioxide is adsorbed and desorbed many times, which reduces the use efficiency of the adsorbent and increases the energy consumption of the vacuum pump.
[0007] All in all, the previous technologies were all for the purpose of purifying non-carbon dioxide gas, so the designed bed height is generally higher, exceeding 3 meters, and the bed height causes a large pressure drop, so the compression energy consumption is relatively large
In the tail gas of many petrochemical refineries, the concentration of carbon dioxide is high (about 50%) and contains saturated water vapor at low temperature. The pressure swing adsorption cycle used before is based on the "stripping cycle" mechanism, which does not consider and take into account the carbon dioxide gas The purity and yield of
And in the traditional vacuum pressure swing adsorption method for carbon dioxide purification, the product gas purging step (or replacement step) is used to improve the purity of the carbon dioxide product gas, which reduces the use efficiency of the adsorbent and increases the energy of the vacuum pump. Consumption, increased industrial costs

Method used

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  • Method and device for separating high-purity CO2 from CO2-containing raw gas
  • Method and device for separating high-purity CO2 from CO2-containing raw gas
  • Method and device for separating high-purity CO2 from CO2-containing raw gas

Examples

Experimental program
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Effect test

Embodiment 1-3

[0060] Hydrogen tail gas from petrochemical refinery methane steam reforming (containing CO 2 Raw material gas) to separate and extract high-purity CO 2 .

[0061] Tail gas (including CO 2 feed gas) is rich in CO 2 The industrial tail gas, its usual components are as follows:

[0062] Table 1 Components of exhaust gas from methane steam reforming hydrogen production system in petrochemical refinery

[0063]

[0064] According to each parameter listed in embodiment 1-3 in table 3 use such as figure 1 Shown gas separation method of the present invention and as figure 2 The shown vacuum variable pressure gas separation device separates the above raw material gas, wherein the number of adsorption towers in the vacuum variable pressure gas separation device is not limited to figure 2 For the four shown, the specific number of adsorption towers is shown in Table 3. The adsorbent in the adsorption tower is silica gel, activated carbon and zeolite X (the filling ratio is 1...

Embodiment 4-6

[0066] Syngas from coal (including CO 2 Raw material gas) to separate and extract high-purity CO 2 .

[0067] Coal-to-synthesis gas (including CO 2 feed gas) is rich in CO 2 Industrial gas, its usual components are as follows:

[0068] Table 2 Composition of coal-to-synthesis gas

[0069]

[0070] According to each parameter listed in embodiment 4-6 in table 3 use such as figure 1 Shown gas separation method of the present invention and as figure 2 The vacuum swing gas separation unit shown separates the above feed gas, wherein a feed gas pressurization step is used instead of figure 1 CO depleted as described in 2 Gas pressurization step, the remaining steps are the same as figure 1 same. The number of adsorption towers in the vacuum swing gas separation device is not limited to figure 2 For the four shown, the specific number of adsorption towers is shown in Table 3. The adsorbent in the adsorption tower is silica gel, activated carbon and zeolite X (the fill...

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Abstract

The invention relates to a method for separating high-purity CO2 from CO2-containing raw gas. The method adopts a vacuum pressure swing adsorption gas separation device and contains a feeding adsorption step, a cocurrent pressure reduction step, an evacuation and exhaust step, a light weight reflux step, a countercurrent pressurization step and a pressurization step. Under the condition that raw gas compression and carbon dioxide product gas flushing do not need to be carried out, the method provided by the invention can be used for obtaining high-purity and high-recovery carbon dioxide through separation and purification with low energy consumption and high efficiency, equipment pressure drop is low, and vacuum requirement is not high; besides, the invention also relates to a device. Thedevice is applicable to the separation method provided by the invention, and the device has the advantages that height of an adsorption tower is low and cycle period is short, cost is saved for CO2 purification in industrial production, and a great economic value is generated.

Description

technical field [0001] The invention relates to the field of carbon dioxide separation, in particular to a one-stage vacuum pressure swing adsorption 2 Separation of high-purity CO from feed gas 2 method and device. Background technique [0002] carbon dioxide (CO 2 ) are major greenhouse gases that contribute to climate change and global warming. The world is currently in a period of transition to low-carbon emissions. China, together with many countries, is launching or has launched carbon tax / carbon trading plans to reduce carbon dioxide emissions, greenhouse gas emissions and improve energy efficiency. Therefore, the recovery and utilization of carbon dioxide from various industrial emissions has huge environmental and economic benefits. It is in line with the "resources-products-renewable resources" circular economic development model and can realize the comprehensive utilization of resources. To meet the needs of various gas separation and purification, many techno...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/047
CPCB01D53/0476B01D2257/504Y02C20/40
Inventor 张军刘明升
Owner 戴莫尔科技有限公司
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