Carbon dioxide capture system

Abstract

The invention provides a carbon dioxide trapping system which comprises a first pipeline, and the first end of the first pipeline is used for being connected with a boiler of a coal yard so as to introduce flue gas generated by the boiler into the first pipeline; the first end of the second pipeline is used for being communicated with the absorption tower, so that an absorbent which absorbs carbon dioxide in the mixed gas in the absorption tower flows into the second pipeline; the heat exchange unit is arranged in the regeneration tower, and the heat exchange unit is communicated with the second end of the first pipeline and the second end of the second pipeline, so that the heat exchange unit heats the absorbent flowing out of the second pipeline by using heat carried by flue gas flowing out of the first pipeline. And the heating efficiency of the power plant is influenced.

Description

Technical Field

[0001] The present invention relates to the technical field of flue gas utilization, and in particular to a carbon dioxide capture system. Background Art

[0002] Before the absorbent enters the regeneration tower, it carries a large amount of carbon dioxide inside. The absorbent needs to release the carbon dioxide it carries in the regeneration tower by increasing its own temperature.

[0003] In the existing technology, steam is generally used to heat the absorbent, and the source of the steam is generated by a power plant. However, the steam generated by the power plant needs to be transported to a steam turbine engine to generate electricity. If the steam generated by the power plant is used to heat the absorbent, it will affect the heating efficiency of the power plant. Summary of the Invention

[0004] The main purpose of the present invention is to provide a carbon dioxide capture system to solve the problem in the prior art that the steam generated by the power plant is used to heat the absorbent, thereby affecting the heating efficiency of the power plant.

[0005] In order to achieve the above object, according to one aspect of the present invention, a carbon dioxide capture system is provided, the carbon dioxide capture system comprising:

[0006] a first pipe, wherein a first end of the first pipe is used to be connected to a boiler in a coal yard so as to introduce flue gas generated by the boiler into the first pipe;

[0007] a second pipe, wherein a first end of the second pipe is connected to the absorption tower so that the absorbent in the absorption tower that has absorbed carbon dioxide in the mixed gas flows into the second pipe;

[0008] The heat exchange unit is arranged in the regeneration tower and is connected to the second end of the first pipe and the second end of the second pipe respectively, so that the heat exchange unit uses the heat carried by the flue gas flowing out of the first pipe to heat the absorbent flowing out of the second pipe.

[0009] Furthermore, the heat exchange unit includes: a first heat exchange subunit, the first heat exchange subunit having an independent first heat exchange channel and a second heat exchange channel;

[0010] a second heat exchange subunit, the second heat exchange subunit having independent third and fourth heat exchange channels;

[0011] Among them, the inlet end of the first heat exchange channel is connected to the second end of the first pipeline, the inlet end of the second heat exchange channel is used to introduce heat exchange medium, the inlet end of the third heat exchange channel is connected to the outlet end of the second heat exchange channel, and the inlet end of the fourth heat exchange channel is connected to the second end of the second pipeline.

[0012] Furthermore, the carbon dioxide capture system also includes:

[0013] The heat exchange medium unit is used to provide heat exchange medium. The heat exchange medium unit has a heat exchange medium inlet and a heat exchange medium outlet. The heat exchange medium inlet is used to introduce heat exchange medium. The heat exchange medium outlet is connected to the inlet end of the second heat exchange channel.

[0014] Furthermore, the carbon dioxide capture system also includes:

[0015] The cooling unit has a cooling inlet and a cooling outlet, the cooling inlet is communicated with the outlet end of the third heat exchange channel, and the cooling outlet is communicated with the heat exchange medium inlet.

[0016] Furthermore, the carbon dioxide capture system also includes:

[0017] a third pipe, wherein a first end of the third pipe is in communication with an outlet end of the fourth heat exchange channel, and a second end of the third pipe is in communication with an absorption tower, so that the absorbent that releases carbon dioxide after heating flows into the absorption tower for reuse;

[0018] An overflow port is also provided on the portion of the third pipeline located in the regeneration tower to release the carbon dioxide in the absorbent after heating from the overflow port to the interior of the regeneration tower.

[0019] Furthermore, the overflow ports are circumferentially distributed on the third pipe, and / or;

[0020] The overflow port is arranged around the third pipe.

[0021] Furthermore, the diameter of the overflow port is within a first preset diameter range, which is 0.5 cm-1 cm.

[0022] Furthermore, the diameter of the overflow port gradually decreases in the extending direction from the third pipeline to the absorption tower.

[0023] Furthermore, the carbon dioxide capture system also includes:

[0024] The desulfurization unit is connected to the outlet end of the first heat exchange channel through the fourth pipeline, and the flue gas from the outlet of the first heat exchange channel enters the desulfurization unit for desulfurization.

[0025] Furthermore, the desulfurization unit also includes:

[0026] The first valve is arranged on the fourth pipeline, and the flow rate of the flue gas entering the desulfurization unit from the first heat exchange channel is controlled by controlling the opening of the first valve.

[0027] By applying the technical solution of the present invention, during use, the heat carried by the flue gas is exchanged with the absorbent that absorbs carbon dioxide in the heat exchange unit to heat the absorbent that has absorbed carbon dioxide, thereby releasing the carbon dioxide in the absorbent. Compared with the existing technology, there is no need to use the heat generated by the power plant steam to heat the absorbent, and the steam of the power plant can be used for power generation, thereby ensuring the power generation efficiency of the power plant. At the same time, in this application, the heat of the flue gas generated by the coal yard itself is used to heat the absorbent, and the heat carried by the flue gas itself will not be wasted. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The accompanying drawings, which constitute part of this application, are intended to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are intended to explain the present invention and do not constitute an undue limitation of the present invention. In the accompanying drawings:

[0029] Figure 1 A schematic diagram of a carbon dioxide capture system according to the present invention is shown.

[0030] The above drawings include the following reference numerals:

[0031] 1. First pipeline; 2. Boiler; 3. Second pipeline; 4. Absorption tower; 5. Regeneration tower; 6. First heat exchange subunit; 7. Second heat exchange subunit; 8. Heat exchange medium unit; 9. Cooling unit; 10. Third pipeline; 11. Desulfurization unit; 12. Fourth pipeline. DETAILED DESCRIPTION

[0032] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in this application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0033] Before the absorbent enters the regeneration tower, it carries a large amount of carbon dioxide inside. The absorbent needs to release the carbon dioxide it carries in the regeneration tower by increasing its own temperature.

[0034] In the existing technology, steam is generally used to heat the absorbent, and the source of the steam is generated by a power plant. However, the steam generated by the power plant needs to be transported to a steam turbine engine to generate electricity. If the steam generated by the power plant is used to heat the absorbent, it will affect the heating efficiency of the power plant.

[0035] The main purpose of the present invention is to provide a carbon dioxide capture system to solve the problem in the prior art that the steam generated by the power plant is used to heat the absorbent, thereby affecting the heating efficiency of the power plant.

[0036] The present application provides a carbon dioxide capture system, which includes: a first pipeline 1, a first end of the first pipeline 1 is used to be connected to a boiler 2 in a coal yard, so as to introduce flue gas generated by the boiler 2 into the first pipeline 1;

[0037] a second pipe 3, wherein a first end of the second pipe 3 is connected to the absorption tower 4 so that the absorbent in the absorption tower 4 that has absorbed carbon dioxide in the mixed gas flows into the second pipe 3;

[0038] The heat exchange unit is arranged in the regeneration tower 5. The heat exchange unit is connected to the second end of the first pipe 1 and the second end of the second pipe 3 respectively, so that the heat exchange unit uses the heat carried by the flue gas flowing out of the first pipe 1 to heat the absorbent flowing out of the second pipe 3.

[0039] Specifically, if Figure 1 As shown, the present application provides a carbon dioxide capture system, including a boiler 2, which is mainly used to burn coal to generate flue gas. A first pipe 1 is provided on the boiler 2, and a first end of the first pipe 1 is connected to the boiler 2. The first pipe 1 is used to introduce the flue gas in the boiler 2 into the first pipe 1. The system also includes an absorption tower 4, which is connected to a second pipe 3, and a first end of the second pipe 3 is connected to the absorption tower 4. An absorbent is provided in the absorption tower 4, and the absorbent is used to absorb carbon dioxide in the mixed gas. The absorbent that has absorbed carbon dioxide flows into the second pipe 3. The system also includes a heat exchange unit provided in the regeneration tower 5, and the heat exchange unit is connected to the second end of the first pipe 1 and the second end of the second pipe 3 respectively, so that the heat exchange unit uses the heat carried by the flue gas flowing out of the first pipe 1 to exchange heat with the absorbent containing carbon dioxide entering the second pipe 3.

[0040] During use, the heat carried by the flue gas is exchanged with the absorbent that absorbs carbon dioxide in the heat exchange unit to heat the absorbent that has absorbed carbon dioxide, thereby releasing the carbon dioxide in the absorbent. Compared with the existing technology, there is no need to use the heat generated by the power plant steam to heat the absorbent. The steam of the power plant can be used for power generation, thereby ensuring the power generation efficiency of the power plant. At the same time, in this application, the heat of the flue gas generated by the coal yard itself is used to heat the absorbent, and the heat carried by the flue gas itself will not be wasted.

[0041] Furthermore, the heat exchange unit includes: a first heat exchange subunit 6, the first heat exchange subunit 6 having an independent first heat exchange channel and a second heat exchange channel;

[0042] The second heat exchange subunit 7 has independent third and fourth heat exchange channels;

[0043] Among them, the inlet end of the first heat exchange channel is connected to the second end of the first pipe 1, the inlet end of the second heat exchange channel is used to introduce heat exchange medium, the inlet end of the third heat exchange channel is connected to the outlet end of the second heat exchange channel, and the inlet end of the fourth heat exchange channel is connected to the second end of the second pipe 3.

[0044] Specifically, the heat exchange unit includes a first heat exchange subunit 6 and a second heat exchange subunit 7. The first heat exchange subunit 6 has a first heat exchange channel and a second heat exchange channel that are independent of each other, and the second heat exchange subunit 7 has a third heat exchange channel and a fourth heat exchange channel that are opposite to each other, wherein the inlet end of the first heat exchange channel is connected to the second end of the first pipe 1, and the inlet end of the second heat exchange channel is used to pass a heat exchange medium, which is water in this application. The inlet end of the third heat exchange channel is connected to the outlet end of the second heat exchange channel, and the inlet end of the fourth heat exchange channel is connected to the second end of the second pipe 3. The heat exchange medium in this application is water. During use, the heat of the flue gas is first used to heat the water to form water vapor, and then the heat carried by the water vapor is used to heat the absorbent that has absorbed carbon dioxide, so as to avoid direct contact between the flue gas and the absorbent, thereby introducing impurities into the absorbent and affecting the normal use of the absorbent.

[0045] Furthermore, the carbon dioxide capture system also includes:

[0046] The heat exchange medium unit 8 is used to provide heat exchange medium. The heat exchange medium unit 8 has a heat exchange medium inlet and a heat exchange medium outlet. The heat exchange medium inlet is used to introduce heat exchange medium. The heat exchange medium outlet is connected to the inlet end of the second heat exchange channel.

[0047] Specifically, the carbon dioxide capture system also includes a heat exchange medium unit 8, which is used to provide a heat exchange medium. The heat exchange medium unit 8 has a heat exchange medium inlet and a heat exchange medium outlet, wherein the heat exchange medium inlet is used to introduce the heat exchange medium into the heat exchange medium unit 8, and the heat exchange medium outlet is connected to the inlet end of the second heat exchange channel to introduce the heat exchange medium from the heat exchange medium outlet into the second heat exchange channel to exchange heat with the heat carried by the flue gas.

[0048] Furthermore, the carbon dioxide capture system also includes:

[0049] The cooling unit 9 has a cooling inlet and a cooling outlet. The cooling inlet is connected to the outlet end of the third heat exchange channel, and the cooling outlet is connected to the heat exchange medium inlet.

[0050] Specifically, the carbon dioxide capture system also includes a cooling unit 9, which has a cooling inlet and a cooling outlet. The cooling inlet is connected to the outlet end of the third heat exchange channel, and the cooling outlet is connected to the heat exchange medium inlet. The cooling unit 9 is used to cool the water coming out of the third heat exchange channel and transport the cooled heat exchange medium to the heat exchange medium unit 8, so that the heat exchange medium can take away the temperature in the flue gas as much as possible when exchanging heat with the flue gas.

[0051] Furthermore, the carbon dioxide capture system also includes:

[0052] a third pipe 10, wherein a first end of the third pipe 10 is connected to the outlet end of the fourth heat exchange channel, and a second end of the third pipe 10 is connected to the absorption tower 4, so that the absorbent that releases carbon dioxide after heating flows into the absorption tower 4 for reuse;

[0053] An overflow port is provided on the portion of the third pipe 10 located in the regeneration tower 5 to release the carbon dioxide in the absorbent after heating into the regeneration tower 5 from the overflow port.

[0054] Specifically, the carbon dioxide capture system also includes a third pipe 10, a first end of the third pipe 10 is connected to the outlet end of the fourth heat exchange channel, and a second end of the third pipe 10 is connected to the absorption tower 4. The third pipe 10 is used to return the absorbent of carbon dioxide released after heating to the absorption tower 4 for reuse.

[0055] Furthermore, the overflow ports are circumferentially distributed on the third pipe 10, and / or;

[0056] The overflow port is arranged around the third pipe 10 .

[0057] Specifically, a plurality of overflow ports are arranged around the third pipe 10 . After the absorbent containing carbon dioxide is heated, the released carbon dioxide can overflow from the overflow ports.

[0058] Furthermore, the diameter of the overflow port is within a first preset diameter range, which is 0.5 cm-1 cm.

[0059] Furthermore, the diameter of the overflow port gradually decreases in the extending direction from the third pipe 10 to the absorption tower 4 .

[0060] Specifically, the diameter of the overflow port ranges from 0.5 cm to 1 cm, and the diameter of the overflow port gradually decreases in the extending direction from the third pipe 10 to the absorption tower 4 .

[0061] Furthermore, the carbon dioxide capture system also includes:

[0062] The desulfurization unit 11 is connected to the outlet end of the first heat exchange channel through the fourth pipe 12. The flue gas from the outlet of the first heat exchange channel enters the desulfurization unit 11 for desulfurization.

[0063] Specifically, the carbon dioxide capture system further includes a desulfurization unit 11, which is connected to the outlet end of the first heat exchange channel through a fourth pipe 12. The flue gas from the outlet of the first heat exchange channel can enter the desulfurization unit 11 for desulfurization.

[0064] Furthermore, the desulfurization unit 11 further includes:

[0065] The first valve is provided on the fourth pipeline 12 , and the flow rate of the flue gas entering the desulfurization unit 11 from the first heat exchange channel is controlled by controlling the opening of the first valve.

[0066] Specifically, the desulfurization unit 11 includes a first valve, which is provided on the fourth pipeline 12 . By controlling the opening of the first valve, the flow rate of the flue gas entering the desulfurization unit 11 from the first heat exchange channel is controlled.

[0067] The embodiment of the present application further provides a method for desulfurization using the flue gas after heat exchange on the basis of the above embodiment. A fifth pipe is further connected to the first pipe 1 and the fourth pipe 12. A valve is provided on the fifth pipe, and a temperature detection component is provided on the fourth pipe 12. The temperature detection component is used to detect the real-time temperature in the fourth pipe 12. When it is judged that the real-time temperature is lower than the preset desulfurization temperature range, the fourth valve is controlled to be closed and the valve on the fifth pipe is opened, so that part of the flue gas in the first pipe 1 is mixed with the flue gas after heat exchange, thereby increasing the temperature of the flue gas entering the desulfurization unit 11. When the real-time temperature is within the preset desulfurization temperature range, the valve on the fifth pipe is controlled to be closed and the fourth valve is opened to allow the flue gas to enter the desulfurization unit 11 for desulfurization treatment. The desulfurization temperature range is 150 degrees Celsius and 170 degrees Celsius.

[0068] From the above description, it can be seen that the above-mentioned embodiments of the present invention achieve the following technical effects: during use, the heat carried by the flue gas is exchanged with the absorbent that absorbs carbon dioxide in the heat exchange unit to heat the absorbent that absorbs carbon dioxide, thereby releasing the carbon dioxide in the absorbent. Compared with the existing technology, there is no need to use the heat generated by the power plant steam to heat the absorbent, and the steam of the power plant can be used for power generation, thereby ensuring the power generation efficiency of the power plant. At the same time, in this application, the heat of the flue gas generated by the coal yard itself is used to heat the absorbent, and the heat carried by the flue gas itself will not be wasted. At the same time, this application is also provided with a desulfurization unit 11, which can desulfurize the flue gas after heat exchange to avoid flue gas pollution to the environment.

[0069] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0070] Unless otherwise specifically stated, the relative arrangement of the parts and steps, the numerical expressions and the numerical values ​​set forth in these embodiments do not limit the scope of the present invention. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship. The techniques, methods and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the techniques, methods and equipment should be considered as part of the authorization specification. In all examples shown and discussed here, any specific values ​​should be interpreted as being merely exemplary and not as limiting. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that similar numbers and letters represent similar items in the following figures, and therefore, once an item is defined in one figure, it does not need to be further discussed in subsequent figures.

[0071] In the description of the present invention, it should be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "horizontal, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention; the directional words "inside and outside" refer to the inside and outside relative to the outline of each component itself.

[0072] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used herein to describe the spatial positional relationship of a device or feature to other devices or features as shown in the figures. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figures. For example, if the device in the drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0073] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0074] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

Claims

1. A carbon dioxide capture system, characterized in that: include: A first pipe (1), wherein a first end of the first pipe (1) is connected to a boiler (2) in a coal yard so as to introduce flue gas generated by the boiler (2) into the first pipe (1); a second pipe (3), wherein a first end of the second pipe (3) is used to communicate with an absorption tower (4), so that the absorbent in the absorption tower (4) that has absorbed carbon dioxide in the mixed gas flows into the second pipe (3); A heat exchange unit is provided in the regeneration tower (5), and the heat exchange unit is respectively connected to the second end of the first pipe (1) and the second end of the second pipe (3), so that the heat exchange unit uses the heat carried by the flue gas flowing out of the first pipe (1) to heat the absorbent flowing out of the second pipe (3).

2. The carbon dioxide capture system according to claim 1, characterized in that The heat exchange unit comprises: A first heat exchange subunit (6), wherein the first heat exchange subunit (6) has an independent first heat exchange channel and a second heat exchange channel; A second heat exchange subunit (7), wherein the second heat exchange subunit (7) has an independent third heat exchange channel and a fourth heat exchange channel; The inlet end of the first heat exchange channel is connected to the second end of the first pipe (1), the inlet end of the second heat exchange channel is used to introduce heat exchange medium, the inlet end of the third heat exchange channel is connected to the outlet end of the second heat exchange channel, and the inlet end of the fourth heat exchange channel is connected to the second end of the second pipe (3).

3. The carbon dioxide capture system according to claim 2, characterized in that The carbon dioxide capture system further comprises: A heat exchange medium unit (8) is used to provide the heat exchange medium. The heat exchange medium unit (8) has a heat exchange medium inlet and a heat exchange medium outlet. The heat exchange medium inlet is used to introduce the heat exchange medium. The heat exchange medium outlet is connected to the inlet end of the second heat exchange channel.

4. The carbon dioxide capture system according to claim 3, characterized in that The carbon dioxide capture system further comprises: A cooling unit (9) is provided, wherein the cooling unit (9) has a cooling inlet and a cooling outlet, wherein the cooling inlet is communicated with the outlet end of the third heat exchange channel, and the cooling outlet is communicated with the heat exchange medium inlet.

5. The carbon dioxide capture system according to claim 2, wherein: The carbon dioxide capture system further comprises: a third pipe (10), wherein a first end of the third pipe (10) is in communication with the outlet end of the fourth heat exchange channel, and a second end of the third pipe (10) is in communication with the absorption tower (4), so as to allow the absorbent that releases carbon dioxide after heating to flow into the absorption tower (4) for reuse; An overflow port is also provided on the portion of the third pipe (10) located in the regeneration tower (5) to release the carbon dioxide in the absorbent after heating from the overflow port into the interior of the regeneration tower (5).

6. The carbon dioxide capture system according to claim 5, characterized in that The overflow outlet is circumferentially distributed on the third pipe (10), and / or; The overflow port is arranged around the third pipe (10).

7. The carbon dioxide capture system according to claim 5, characterized in that The diameter of the overflow port is within a first preset diameter range, which is 0.5 cm to 1 cm.

8. The carbon dioxide capture system according to claim 7, characterized in that In the extending direction from the third pipe (10) to the absorption tower (4), the diameter of the overflow port gradually decreases.

9. The carbon dioxide capture system according to claim 2, wherein: The carbon dioxide capture system further comprises: A desulfurization unit (11) is connected to the outlet end of the first heat exchange channel through a fourth pipe (12), and the flue gas exiting the outlet of the first heat exchange channel enters the desulfurization unit (11) for desulfurization.

10. The carbon dioxide capture system according to claim 9, characterized in that The desulfurization unit further comprises: A first valve is provided on the fourth pipe (12), and the flow rate of the flue gas entering the desulfurization unit (11) from the first heat exchange channel is controlled by controlling the opening of the first valve.

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