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CO2 trapping device and method

A technology of enrichment liquid and regeneration tower, which is applied in separation methods, chemical instruments and methods, and separation of dispersed particles, etc., can solve the problems of low carbon dioxide pressure, troublesome storage process, and increased storage costs, so as to reduce compression costs and reduce Capture cost and effect of reducing heat of vaporization

Inactive Publication Date: 2020-09-29
CHNA ENERGY INVESTMENT CORP LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In the prior art, the absorption liquid is generally used in the absorption tower to absorb the CO contained in the raw gas (such as flue gas) 2 , to obtain the carbon dioxide-enriched liquid; then the carbon dioxide-enriched liquid is heated in the regeneration tower, so that the CO contained in the carbon dioxide-enriched liquid 2 desorption, however, the pressure of the desorbed carbon dioxide is not high, and in the subsequent storage and utilization, the CO2 needs to be 2 stored after compression, which not only makes the CO 2 The storage process is more troublesome, but also increases the CO 2 storage costs, resulting in CO 2 Capture energy consumption is relatively high

Method used

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Embodiment 1

[0036] see Figure 2 ~ Figure 4 , the embodiment of the present invention provides a CO 2 capture device, which captures CO 2 In the process of absorbing carbon dioxide, the absorption liquid (that is, the carbon dioxide enriched liquid) is pressurized to ensure the high output pressure of CO 2 gas to avoid direct compression of CO 2 gas. At the same time, compared to CO 2 The difficulty of gas compression, the difficulty of pressurized treatment of carbon dioxide enriched liquid is relatively low, therefore, the CO provided by the embodiment of the present invention 2 Capture device reduces CO 2 Gas compression energy consumption. Specifically, the CO 2The trapping device comprises an absorption tower 100 and a high-pressure regeneration tower 300, the liquid outlet of the absorption tower 100 is connected with the liquid inlet of the high-pressure regeneration tower 300, the gas outlet of the high-pressure regeneration tower 300 is connected with the first carbon diox...

Embodiment 2

[0058] Such as Figure 2 to Figure 5 As shown, the embodiment of the present invention provides a CO 2 capture method, applying the above CO 2 capture device, the CO 2 Capture methods include:

[0059] Step S100: Absorb the carbon dioxide contained in the raw material gas with the absorption liquid in the absorption tower 100 to obtain a carbon dioxide enriched liquid; after the carbon dioxide contained in the raw material gas is absorbed by the absorption liquid, the gas discharged from the absorption tower 100 is purified gas.

[0060] Step S300: heating the carbon dioxide-enriched liquid in the high-pressure regeneration tower 300 to obtain the carbon dioxide-depleted liquid and the first desorbed CO 2 gas, the first desorbed CO 2 The pressure of the gas is equal to the preset carbon dioxide pressure;

[0061] Step S400a: desorb the first CO 2 The gas is sent to the first carbon dioxide branch a.

[0062] Step S400b: heating the carbon dioxide-poor liquid in the atmo...

Embodiment 3

[0084] A CO provided by the embodiment of the present invention 2 capture method, the CO 2 Capture methods are used as figure 2 CO shown 2 capture device, figure 2 The pressurizing unit 200 in the pressurization pump is selected for use. The CO contained in the flue gas at the outlet of a 650MW power plant (with a net thermoelectric efficiency of 38.9%) 2 to capture. The absorption liquid includes 10% by mass of PZ (piperazine) and 20% by mass of MDEA (N-methyldiethanolamine) aqueous solution. The flue gas contains 10% H by volume 2 O, 12.0% CO by volume 2 and a volume fraction of 78% N 2 , the mass flow rate is 3100t / h, the temperature inside the absorption tower is room temperature, and the pressure inside the tower is 1 atm; the temperature inside the normal pressure regeneration tower is 100°C, and the pressure inside the tower is 1 atm; °C, the pressure inside the tower is 5kg, and the pressurization pressure of the booster pump on the carbon dioxide enriched l...

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Abstract

The invention discloses a CO2 trapping device and method, relates to the technical field of gas purification, and aims to improve the carbon dioxide desorption speed and reduce the carbon dioxide trapping energy consumption at the same time. The CO2 trapping device comprises an absorption tower, a high-pressure regeneration tower and a normal-pressure regeneration tower; the liquid outlet of the absorption tower is connected with the liquid inlet of the high-pressure regeneration tower; the liquid outlet of the high-pressure regeneration tower is connected with the liquid inlet of the normal-pressure regeneration tower, the liquid outlet of the normal-pressure regeneration tower is connected with the liquid inlet of the absorption tower, the gas outlet of the normal-pressure regeneration tower is connected with a second carbon dioxide branch, and the pressure of the high-pressure regeneration tower is equal to a preset carbon dioxide pressure. The CO2 trapping method is applied to theCO2 trapping device. The provided CO2 trapping device and method are used for gas purification.

Description

technical field [0001] The invention relates to the technical field of gas purification, in particular to a CO 2 Capture device and method. Background technique [0002] Humans have released CO into the atmosphere since the Industrial Revolution 2 Such heat-absorbing greenhouse gases are increasing year by year, which increases the greenhouse effect of the atmosphere and leads to a series of extremely serious problems such as global warming. This has attracted the attention of countries all over the world. Therefore, reducing CO 2 Emissions have become an important way to curb the enhancement of the greenhouse effect. [0003] In the prior art, the absorption liquid is generally used in the absorption tower to absorb the CO contained in the raw gas (such as flue gas) 2 , to obtain the carbon dioxide-enriched liquid; then the carbon dioxide-enriched liquid is heated in the regeneration tower, so that the CO contained in the carbon dioxide-enriched liquid 2 desorption, how...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/18
CPCB01D53/1425B01D53/1475B01D53/18
Inventor 赵兴雷张峰王保登崔倩顾佑宗李永龙
Owner CHNA ENERGY INVESTMENT CORP LTD
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