CN217829551U - Carbon capture system suitable for ultralow concentration CO2 flue gas - Google Patents

Carbon capture system suitable for ultralow concentration CO2 flue gas Download PDF

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Publication number
CN217829551U
CN217829551U CN202221898422.1U CN202221898422U CN217829551U CN 217829551 U CN217829551 U CN 217829551U CN 202221898422 U CN202221898422 U CN 202221898422U CN 217829551 U CN217829551 U CN 217829551U
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flue gas
absorption device
concentration
rich liquid
carbon capture
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仝丹丹
穆宗勤
王立志
刘广磊
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Carbon Cable Hangzhou Energy And Environment Technology Co ltd
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Carbon Cable Hangzhou Energy And Environment Technology Co ltd
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
    • Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02C—CAPTURE, STORAGE, SEQUESTRATION OR DISPOSAL OF GREENHOUSE GASES [GHG]
    • Y02C20/00—Capture or disposal of greenhouse gases
    • Y02C20/40—Capture or disposal of greenhouse gases of CO2

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Abstract

The utility model provides a be applicable to ultralow concentration CO 2 The carbon capture system of the flue gas comprises a primary absorption device, a secondary absorption device, a first pipeline, a second pipeline and a cooler, wherein the flue gas enters a secondary absorption unit and is in countercurrent contact with semi-rich liquid to form rich liquid, then the rich liquid is discharged from a bottom outlet, the flue gas is conveyed into a lower inlet of the primary absorption device and is discharged from a top outlet after being in countercurrent contact with an absorbent, the semi-rich liquid discharged from a bottom inlet of the primary absorption device enters the cooler through a booster pump, and the semi-rich liquid heated due to the absorption of carbon dioxide enters the coolerAnd (5) cooling, wherein the cooled semi-rich liquid enters from an upper inlet of the secondary absorption device to spray the flue gas, so as to form circulation. The utility model is used for ultralow CO 2 Carbon capture of flue gas at a concentration of 1-10 mol%, increase of rich solution capacity of the absorbent, and CO content of 90% or more for low concentration flue gas 2 Capture rate while ensuring CO 2 The regeneration load is lower than 3GJ/tCO 2 。

Description

Carbon capture system suitable for ultralow concentration CO2 flue gas
Technical Field
The utility model relates to a flue gas treatment technical field, concretely relates to be applicable to ultralow concentration CO 2 A carbon capture system for flue gas.
Background
Global warming has become the most interesting world problem, CO 2 Is one of the most important greenhouse gases in the atmosphere, and the large amount of emission of the greenhouse gases poses potential threats to the production and the life of human beings. When the concentration of CO2 in the flue gas is more than 10 percent, the existing carbon capture system can meet the requirement of CO simultaneously 2 The trapping rate is more than 90 percent, and CO 2 The regenerative load is less than 3.0GJ/tCO 2 But for CO 2 The low-concentration flue gas with the concentration less than 10 percent has unsatisfactory trapping effect of the traditional carbon trapping system, and can not simultaneously ensure the rich liquid capacity and CO 2 Trapping rate, CO 2 Regeneration load and other parameters. Therefore, a method suitable for low concentration CO has been developed 2 And the carbon capture system of the flue gas promotes the carbon emission reduction process.
In the prior art, a low-energy-consumption carbon dioxide capturing method for low-concentration carbon dioxide-containing tail gas and a system publication No. CN111744328A are provided, in the method, part of amine-rich liquid from a tower kettle of a carbon dioxide absorption tower is cooled by an amine-rich liquid cooler and then enters the carbon dioxide absorption tower through inlets in the middle and upper parts of the carbon dioxide absorption tower, although the amount of the amine liquid sprayed by the carbon dioxide absorption tower is increased, the gas-liquid ratio in the carbon dioxide absorption tower is kept, but the capacity of absorbent rich liquid is still required to be improved.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a be applicable to ultralow concentration CO 2 Carbon capture system for flue gas, overcoming the problems of the prior art, which can be used for ultra low CO 2 The concentration of the carbon capture of the flue gas is 1-10 percent mol, and the CO concentration of the flue gas with low concentration can reach more than 90 percent 2 Capture rate while ensuring CO 2 Regenerative load is less than 3GJ/tCO 2 。
In order to achieve the purpose, the utility model adopts the technical proposal that: provides a catalyst suitable for ultra-low concentration CO 2 The carbon capture system for the flue gas is characterized by comprising an absorption device, wherein the upper part of the primary absorption device is provided with an absorbent inlet, and the top of the primary absorption device is provided with a flue gas outlet for absorbing carbon dioxide in the flue gas by the absorbent to generate semi-rich liquid;
the lower part of the secondary absorption device is provided with a flue gas inlet, and the top outlet of the secondary absorption device is connected with the lower inlet of the primary absorption device and is used for absorbing carbon dioxide in flue gas by semi-rich liquid to generate rich liquid;
one end of the first pipeline is connected with a bottom outlet of the primary absorption device, and the other end of the first pipeline is connected with an upper inlet of the secondary absorption device;
one end of the second pipeline is connected with a bottom outlet of the secondary absorption device;
and the cooler is arranged on the first pipeline and is used for cooling the semi-rich liquid.
The system also comprises a booster pump and a rich liquid pump, wherein the booster pump is arranged on the first pipeline and between the primary absorption device and the cooler, and the rich liquid pump is arranged on the second pipeline.
The bottom outlet of the first-stage absorption device is connected with the inlet of the booster pump, the outlet of the booster pump is connected with the inlet of the cooler, and the outlet of the cooler is connected with the inlet at the upper part of the second-stage absorption device.
The ultra-low concentration of CO 2 The carbon dioxide concentration in the flue gas is 1-10 percent by mol.
The first-stage absorption device and the second-stage absorption device are packed towers.
The height of the filler in the first-stage absorption device is 2-8D 1.
And the height of the filler in the secondary absorption device is 2-8D 2.
The diameter of the first-stage absorption device is 0.8-1.2 times of that of the second-stage absorption device.
The height of the first-stage absorption device is 0.2-5 times of that of the second-stage absorption device.
The utility model provides a pair of be applicable to ultralow concentration CO 2 The carbon capture system of flue gas has the beneficial effects that:
for ultra-low CO 2 Carbon capture of flue gas at a concentration of 1-10 mol%, increase of rich solution capacity of the absorbent, and CO content of 90% or more for low concentration flue gas 2 Capture rate while ensuring CO 2 The regeneration load is lower than 3GJ/tCO 2 。
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the technical solutions in the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic view of a carbon capture system according to the present invention.
The reference numerals in the figures are illustrated as follows: 1. a primary absorption device; 2. a secondary absorption device; 3. a cooler; 4. a booster pump; 5. a rich liquor pump; 6. a first pipeline; 7. a second pipeline.
Detailed Description
In the description of the present invention, it is to be understood that the terms indicating orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplification of description, and do not indicate or imply that the equipment or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate the position or positional relationship based on the position or positional relationship shown in the drawings, or the position or positional relationship which is usually placed when the product of the present invention is used, and are only for convenience of description and simplification of the description, but do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another, and are not to be construed as indicating or implying relative importance.
Referring to FIG. 1, the present invention provides a method for ultra-low CO concentration 2 A carbon capture system for flue gas is illustrated. The system comprises a primary absorption device 1, a secondary absorption device 2, a first pipeline 6, a second pipeline 7 and a cooler 3;
the upper part of the primary absorption device 1 is provided with an absorbent inlet, and the top part of the primary absorption device is provided with a flue gas outlet, and the absorbent is used for absorbing carbon dioxide in flue gas to generate semi-rich liquid; the lower part of the secondary absorption device 2 is provided with a flue gas inlet, and the top outlet is connected with the lower inlet of the primary absorption device 1 and is used for absorbing carbon dioxide in flue gas by semi-rich liquid to generate rich liquid; one end of the first pipeline 6 is connected with the bottom outlet of the primary absorption device 1, and the other end is connected with the upper inlet of the secondary absorption device 2; one end of the second pipeline 7 is connected with the bottom outlet of the secondary absorption device 2; a cooler 3 is arranged on the first line 6 for cooling the semi-rich liquid.
The device is characterized by further comprising a booster pump 4 and a rich liquid pump 5, wherein the booster pump 4 is arranged on the first pipeline 6 and is arranged between the first-stage absorption device 1 and the cooler 3, and the rich liquid pump 5 is arranged on the second pipeline 7.
The bottom outlet of the primary absorption device 1 is connected with the inlet of a booster pump 4, the outlet of the booster pump 4 is connected with the inlet of a cooler 3, and the outlet of the cooler 3 is connected with the inlet of the upper part of the secondary absorption device 2.
The absorbent enters from an inlet at the upper part of the first-stage absorption device 1, the flue gas containing ultra-low carbon dioxide concentration enters the second-stage absorption device 2 from a flue gas inlet of the second-stage absorption device 2, the flue gas is in countercurrent contact with semi-rich liquid sprayed from the upper part of the second-stage absorption device 2 in the second-stage absorption device 2, and the semi-rich liquid becomes rich liquid after absorbing carbon dioxide in the flue gas and flows out from the bottom of the second-stage absorption device 2 to enter a rich liquid pump 5.
The flue gas is sent into the lower part entry of one-level absorbing device 1 from the top of second grade absorbing device 2 behind second grade absorbing device 2, and the flue gas is discharged from the export in top after the absorbent that sprays down with the upper portion of one-level absorbing device 1 is in the one-level absorbing device 1 adverse current contact, becomes half rich liquid behind the carbon dioxide in the absorbent absorption flue gas and discharges from the entry of one-level absorbing device 1 bottom.
The semi-rich liquid discharged from the bottom inlet of the primary absorption device 1 enters the cooler 3 through the booster pump, the semi-rich liquid heated due to the absorption of carbon dioxide is cooled, and the cooled semi-rich liquid enters from the upper inlet of the secondary absorption device 2 and sprays the flue gas to form circulation.
Wherein one-level absorbing device 1 and second grade absorbing device 2 are the packed tower, and the filler height is 2 ~ 8D1 in one-level absorbing device 1, and the filler height is 2 ~ 8D2 in the second grade absorbing device 2, and 1 diameter of one-level absorbing device is 0.8 ~ 1.2 times of 2 diameters of second grade absorbing device, and 1 height of one-level absorbing device is 0.2 ~ 5 times of 2 heights of second grade absorbing device.
The above-mentioned embodiments further explain in detail the technical problems, technical solutions and advantages solved by the present invention, and it should be understood that the above only is a specific embodiment of the present invention, and is not intended to limit the present invention, and any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the scope of the present invention.

Claims (9)

1. Is suitable for ultralow-concentration CO 2 A system for carbon capture of flue gas, comprising:
the device comprises a primary absorption device (1), wherein an absorbent inlet is formed in the upper part of the primary absorption device (1), and a flue gas outlet is formed in the top of the primary absorption device (1) and used for absorbing carbon dioxide in flue gas by using an absorbent to generate semi-rich liquid;
the lower part of the secondary absorption device (2) is provided with a flue gas inlet, and the top outlet of the secondary absorption device (2) is connected with the lower inlet of the primary absorption device (1) and is used for absorbing carbon dioxide in flue gas by semi-rich liquid to generate rich liquid;
one end of the first pipeline (6) is connected with a bottom outlet of the primary absorption device (1), and the other end of the first pipeline (6) is connected with an upper inlet of the secondary absorption device (2);
one end of the second pipeline (7) is connected with a bottom outlet of the secondary absorption device (2);
a cooler (3), the cooler (3) being arranged on the first pipeline (6) for cooling the semi-rich liquid.
2. The method for treating ultralow-concentration CO according to claim 1 2 The carbon capture system of flue gas, characterized in that, the system still includes booster pump (4) and rich liquid pump (5), booster pump (4) are established on first pipeline (6), establish between one-level absorbing device (1) and cooler (3), rich liquid pump (5) are established on second pipeline (7).
3. The method for treating ultralow-concentration CO according to claim 2 2 The carbon capture system of flue gas, its characterized in that, the bottom export of one-level absorbing device (1) links to each other with booster pump (4) entry, booster pump (4) export links to each other with cooler (3) entry, cooler (3) export links to each other with second grade absorbing device (2) upper portion entry.
4. The method of claim 1, wherein the CO is used for ultralow concentration of CO 2 System for carbon capture of flue gases, characterized in that said ultra-low concentration CO 2 The carbon dioxide concentration in the flue gas is 1-10 mol%.
5. The method for treating ultralow-concentration CO according to claim 1 2 The carbon capture system for the flue gas is characterized in that the primary absorption device (1) and the secondary absorption device (2) are packed towers.
6. The method of claim 5, wherein the CO concentration is very low 2 The carbon capture system of flue gas, characterized in that, the filler height is 2 ~ 8D1 in one-level absorbing device (1).
7. The method of claim 5, wherein the CO concentration is very low 2 The carbon capture system of flue gas, characterized in that, the filler height is 2-8D 2 in secondary absorption device (2).
8. The method for treating ultralow-concentration CO according to claim 1 2 The carbon capture system of the flue gas is characterized in that the diameter of the primary absorption device (1) is 0.8-1.2 times of that of the secondary absorption device (2).
9. The method of claim 1, wherein the CO is used for ultralow concentration of CO 2 The carbon capture system for the flue gas is characterized in that the height of the primary absorption device (1) is 0.2-5 times of that of the secondary absorption device (2).
CN202221898422.1U 2022-07-22 2022-07-22 Carbon capture system suitable for ultralow concentration CO2 flue gas Active CN217829551U (en)

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CN202221898422.1U CN217829551U (en) 2022-07-22 2022-07-22 Carbon capture system suitable for ultralow concentration CO2 flue gas

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202221898422.1U CN217829551U (en) 2022-07-22 2022-07-22 Carbon capture system suitable for ultralow concentration CO2 flue gas

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CN217829551U true CN217829551U (en) 2022-11-18

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