Flue gas after-treatment system

Abstract

The invention provides a flue gas post-treatment system, which comprises: a flue gas pretreatment assembly, a flue gas inlet of the flue gas pretreatment assembly is connected with a gas outlet of an absorption tower, and the flue gas pretreatment assembly is used for pretreating flue gas to remove most of an absorbent in the flue gas; a flue gas inlet of the molecular sieve absorption assembly is connected with a flue gas outlet of the flue gas pretreatment assembly, the molecular sieve absorption assembly is used for absorbing the residual absorbent in the flue gas, and a flue gas outlet of the molecular sieve absorption assembly is used for discharging the flue gas; the molecular sieve desorption assembly is connected with the liquid outlet of the molecular sieve absorption assembly, and the molecular sieve desorption assembly is used for enabling the molecular sieve absorption assembly to desorb the absorbed absorbent; the control module is electrically connected with the flue gas pretreatment assembly, the molecular sieve absorption assembly and the molecular sieve desorption assembly, so that the problem that in the prior art, flue gas discharged from an absorption tower of the trapping device cannot be directly discharged is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of flue gas treatment, and in particular to a flue gas post-treatment system. Background Art

[0002] In the industrial production process, especially in the chemical, petrochemical, and electric power industries, the flue gas produced by combustion or chemical reactions contains a variety of pollutants, including acidic gases such as carbon dioxide (CO2), sulfur dioxide (SO2), nitrogen oxides (NOx), etc. If these pollutants are directly discharged into the atmosphere without treatment, they will have a serious impact on the environment and human health. Therefore, the research and application of industrial flue gas treatment technology has received widespread attention.

[0003] The existing flue gas treatment technologies mainly include wet desulfurization, selective catalytic reduction (SCR) denitrification and absorption deacidification. Although these technologies can remove pollutants in flue gas to a certain extent, they still have some limitations:

[0004] (1) Secondary pollution problem: Some treatment methods may produce solid waste or wastewater, causing secondary pollution.

[0005] (2) Energy consumption problem: Some removal processes consume a lot of energy, which increases the operating costs of the enterprise.

[0006] (3) Absorbent volatilization: The liquid absorbent used in the absorption tower may partially evaporate into the flue gas due to operating conditions (such as high temperature and low pressure), resulting in absorbent loss and may affect the performance and service life of subsequent flue gas treatment equipment.

[0007] Equipment complexity: In the existing technology, the flue gas treatment system may be composed of multiple independent devices, which makes the system complex and difficult to operate and maintain.

[0008] (5) Balance between efficiency and cost: How to reduce costs while ensuring removal efficiency is another challenge faced by existing technologies. Summary of the invention

[0009] The main purpose of the present invention is to provide a flue gas post-treatment system to solve the problem in the prior art that the flue gas coming out of the absorption tower of the capture device cannot be directly discharged.

[0010] In order to achieve the above-mentioned purpose, the present invention provides a flue gas post-treatment system, comprising: a flue gas pretreatment component, the flue gas inlet of the flue gas pretreatment component is connected to the gas outlet of the absorption tower, the flue gas pretreatment component is used to pretreat the flue gas to remove most of the absorbent in the flue gas; a molecular sieve absorption component, the flue gas inlet of the molecular sieve absorption component is connected to the flue gas outlet of the flue gas pretreatment component, the molecular sieve absorption component is used to absorb the remaining absorbent in the flue gas, and the smoke outlet of the molecular sieve absorption component is used to discharge the flue gas; a molecular sieve desorption component, the molecular sieve desorption component is connected to the liquid outlet of the molecular sieve absorption component, the molecular sieve desorption component is used to enable the molecular sieve absorption component to desorb the absorbed absorbent; a control module, the control module is electrically connected to the flue gas pretreatment component, the molecular sieve absorption component and the molecular sieve desorption component to control the working states of the flue gas pretreatment component, the molecular sieve absorption component and the molecular sieve desorption component.

[0011] Furthermore, the flue gas pretreatment component includes a water scrubber, and the flue gas inlet and the flue gas outlet of the flue gas pretreatment component are respectively arranged at the bottom and the top of the water scrubber, and the flue gas passing through the water scrubber contacts with the water inside the water scrubber.

[0012] Furthermore, a spray assembly is provided inside the water washing tower, and the spray assembly is located on the upper side of the water washing tower to spray water toward the lower side of the water washing tower.

[0013] Furthermore, the molecular sieve absorption component includes a molecular sieve tower, the flue gas inlet and the flue gas outlet of the molecular sieve absorption component are respectively arranged at the bottom and the top of the molecular sieve tower, and a molecular sieve material filling part is arranged inside the molecular sieve tower for contacting with the flue gas to absorb the remaining absorbent in the flue gas.

[0014] Furthermore, the molecular sieve absorption component includes a vacuum pump, which is arranged on the connecting pipeline between the flue gas pretreatment component and the molecular sieve absorption component to pump the flue gas into the interior of the molecular sieve tower.

[0015] Furthermore, the molecular sieve desorption assembly includes: a heating component, at least a portion of which is arranged inside the molecular sieve tower to heat the molecular sieve material filling portion, and a control module is connected to the heating component to control the working state of the heating component; a recovery tank, the inlet of the recovery tank is connected to the liquid outlet of the molecular sieve tower to receive the absorbent desorbed from the molecular sieve material filling portion.

[0016] Furthermore, the flue gas post-treatment system includes: a first control valve, which is arranged at the smoke inlet of the smoke pretreatment component to control the opening and closing of the smoke inlet of the smoke pretreatment component; wherein, the control module is connected to the first control valve to control the working state of the first control valve; a second control valve, which is arranged at the smoke outlet of the smoke pretreatment component to control the opening and closing of the smoke outlet of the smoke pretreatment component; wherein, the control module is connected to the second control valve to control the working state of the second control valve.

[0017] Furthermore, the flue gas after-treatment system includes: a third control valve, which is arranged at the liquid outlet of the water washing tower to control the opening and closing of the liquid outlet of the water washing tower; wherein the control module is connected to the third control valve to control the working state of the third control valve; a fourth control valve, which is arranged at the liquid outlet of the molecular sieve tower to control the opening and closing of the liquid outlet of the molecular sieve tower; wherein the control module is connected to the fourth control valve to control the working state of the fourth control valve.

[0018] Furthermore, the flue gas post-treatment system includes a connecting pipe, which includes: a first flue gas pipe, both ends of which are respectively connected to the flue gas inlet of the flue gas pretreatment component and the gas outlet of the absorption tower; a second flue gas pipe, both ends of which are respectively connected to the flue gas outlet of the flue gas pretreatment component and the flue gas inlet of the molecular sieve absorption component; a liquid pipe, the inlet of the liquid pipe is connected to the liquid outlet of the molecular sieve tower and the liquid outlet of the water washing tower, and the outlet of the liquid pipe is connected to the inlet of the recovery tank.

[0019] Furthermore, the connecting pipeline includes a liquid pump, which is arranged on the liquid pipeline for pumping the liquid containing the absorbent to the recovery tank; wherein the control module is connected to the liquid pump to control the working state of the liquid pump.

[0020] Applying the technical solution of the present invention, the flue gas post-treatment system of the present invention includes: a flue gas pretreatment component, the flue gas inlet of the flue gas pretreatment component is connected to the gas outlet of the absorption tower, and the flue gas pretreatment component is used to pre-treat the flue gas to remove most of the absorbent in the flue gas; a molecular sieve absorption component, the flue gas inlet of the molecular sieve absorption component is connected to the flue gas outlet of the flue gas pretreatment component, the molecular sieve absorption component is used to absorb the remaining absorbent in the flue gas, and the flue gas outlet of the molecular sieve absorption component is used to discharge the flue gas; a molecular sieve desorption component, the molecular sieve desorption component is connected to the liquid outlet of the molecular sieve absorption component, and the molecular sieve desorption component is used to make the molecular sieve absorption component desorb the absorbed absorbent; a control module, the control module is electrically connected to the flue gas pretreatment component, the molecular sieve absorption component and the molecular sieve desorption component to control the working states of the flue gas pretreatment component, the molecular sieve absorption component and the molecular sieve desorption component. In this way, the problem in the prior art that the flue gas coming out of the absorption tower of the capture device cannot be directly discharged is solved. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0022] Figure 1 A structural schematic diagram of an embodiment of a flue gas aftertreatment system according to the present invention is shown.

[0023] The above drawings include the following reference numerals:

[0024] 1. Flue gas pretreatment component; 11. Water scrubber; 12. Spray component;

[0025] 2. Molecular sieve absorption component; 21. Molecular sieve tower; 22. Molecular sieve material filling part; 23. Vacuum pump;

[0026] 3. Molecular sieve desorption component; 31. Heating component; 32. Recovery tank;

[0027] 5. The first control valve;

[0028] 6. Second control valve;

[0029] 7. The third control valve;

[0030] 8. Fourth control valve;

[0031] 9. Connecting pipe; 91. First flue gas pipe; 92. Second flue gas pipe; 93. Liquid pipe; 94. Liquid pump; 95. Third flue gas pipe. DETAILED DESCRIPTION

[0032] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present 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] like Figure 1 As shown, the present invention provides a flue gas post-treatment system, including: a flue gas pretreatment component 1, the flue gas inlet of the flue gas pretreatment component 1 is connected to the gas outlet of the absorption tower, and the flue gas pretreatment component 1 is used to pre-treat the flue gas to remove most of the absorbent in the flue gas; a molecular sieve absorption component 2, the flue gas inlet of the molecular sieve absorption component 2 is connected to the flue gas outlet of the flue gas pretreatment component 1, the molecular sieve absorption component 2 is used to absorb the remaining absorbent in the flue gas, and the flue gas outlet of the molecular sieve absorption component 2 is used to discharge the flue gas; a molecular sieve desorption component 3, the molecular sieve desorption component 3 is connected to the liquid outlet of the molecular sieve absorption component 2, and the molecular sieve desorption component 3 is used to make the molecular sieve absorption component 2 desorb the absorbed absorbent; a control module, the control module is electrically connected to the flue gas pretreatment component 1, the molecular sieve absorption component 2 and the molecular sieve desorption component 3 to control the working state of the flue gas pretreatment component 1, the molecular sieve absorption component 2 and the molecular sieve desorption component 3. In this way, the problem that the flue gas coming out of the absorption tower of the capture device cannot be directly discharged in the prior art is solved.

[0034] like Figure 1 As shown, the flue gas pretreatment component 1 includes a water scrubber 11 , and the flue gas inlet and the flue gas outlet of the flue gas pretreatment component 1 are respectively arranged at the bottom and the top of the water scrubber 11 , and the flue gas passing through the water scrubber 11 contacts with the water inside the water scrubber 11 .

[0035] like Figure 1 As shown, a spray assembly 12 is disposed inside the water washing tower 11 , and the spray assembly 12 is located on the upper side of the water washing tower 11 to spray water toward the lower side of the water washing tower 11 .

[0036] like Figure 1 As shown, the molecular sieve absorption component 2 includes a molecular sieve tower 21, and the flue gas inlet and the flue gas outlet of the molecular sieve absorption component 2 are respectively arranged at the bottom and the top of the molecular sieve tower 21. A molecular sieve material filling part 22 is arranged inside the molecular sieve tower 21 for contacting with the flue gas to absorb the remaining absorbent in the flue gas.

[0037] like Figure 1 As shown, the molecular sieve absorption component 2 includes a vacuum pump 23 , which is arranged on the connecting pipeline between the flue gas pretreatment component 1 and the molecular sieve absorption component 2 to pump the flue gas into the molecular sieve tower 21 .

[0038] like Figure 1As shown, the molecular sieve desorption assembly 3 includes: a heating component 31, at least a portion of which is arranged inside the molecular sieve tower 21 to heat the molecular sieve material filling part 22, and a control module is connected to the heating component 31 to control the working state of the heating component 31; a recovery tank 32, the inlet of the recovery tank 32 is connected to the liquid outlet of the molecular sieve tower 21, so as to receive the absorbent desorbed from the molecular sieve material filling part 22.

[0039] like Figure 1 As shown, the flue gas post-treatment system includes: a first control valve 5, which is arranged at the flue gas inlet of the flue gas pretreatment component 1 to control the opening and closing of the flue gas inlet of the flue gas pretreatment component 1; wherein the control module is connected to the first control valve 5 to control the working state of the first control valve 5; a second control valve 6, which is arranged at the flue gas outlet of the flue gas pretreatment component 1 to control the opening and closing of the flue gas outlet of the flue gas pretreatment component 1; wherein the control module is connected to the second control valve 6 to control the working state of the second control valve 6.

[0040] like Figure 1 As shown, the flue gas post-treatment system includes: a third control valve 7, which is arranged at the liquid outlet of the water scrubber 11 to control the opening and closing of the liquid outlet of the water scrubber 11; wherein the control module is connected to the third control valve 7 to control the working state of the third control valve 7; a fourth control valve 8, which is arranged at the liquid outlet of the molecular sieve tower 21 to control the opening and closing of the liquid outlet of the molecular sieve tower 21; wherein the control module is connected to the fourth control valve 8 to control the working state of the fourth control valve 8.

[0041] like Figure 1 As shown, the flue gas post-treatment system includes a connecting pipe 9, which includes: a first flue gas pipe 91, the two ends of which are respectively connected to the flue gas inlet of the flue gas pretreatment component 1 and the gas outlet of the absorption tower; a second flue gas pipe 92, the two ends of which are respectively connected to the flue gas outlet of the flue gas pretreatment component 1 and the flue gas inlet of the molecular sieve absorption component 2; a liquid pipe 93, the inlet of the liquid pipe 93 is connected to the liquid outlet of the molecular sieve tower 21 and the liquid outlet of the water washing tower 11, and the outlet of the liquid pipe 93 is connected to the inlet of the recovery tank 32.

[0042] like Figure 1 As shown, the connecting pipe 9 includes a third flue gas pipe 95 , and the third flue gas pipe 95 is connected to the flue gas outlet of the molecular sieve absorption component 2 .

[0043] like Figure 1As shown, the connecting pipeline 9 includes a liquid pump 94 , which is arranged on the liquid pipeline 93 to pump the liquid containing the absorbent to the recovery tank 32 ; wherein the control module is connected to the liquid pump 94 to control the working state of the liquid pump 94 .

[0044] From the above description, it can be seen that the above embodiments of the present invention achieve the following technical effects:

[0045] The flue gas post-treatment system of the present invention comprises: a flue gas pre-treatment component 1, the flue gas inlet of the flue gas pre-treatment component 1 is connected to the gas outlet of the absorption tower, and the flue gas pre-treatment component 1 is used to pre-treat the flue gas to remove most of the absorbent in the flue gas; a molecular sieve absorption component 2, the flue gas inlet of the molecular sieve absorption component 2 is connected to the flue gas outlet of the flue gas pre-treatment component 1, the molecular sieve absorption component 2 is used to absorb the remaining absorbent in the flue gas, and the flue gas outlet of the molecular sieve absorption component 2 is used to discharge the flue gas; a molecular sieve desorption component 3, the molecular sieve desorption component 3 is connected to the liquid outlet of the molecular sieve absorption component 2, and the molecular sieve desorption component 3 is used to make the molecular sieve absorption component 2 desorb the absorbed absorbent; a control module, the control module is electrically connected to the flue gas pre-treatment component 1, the molecular sieve absorption component 2 and the molecular sieve desorption component 3 to control the working state of the flue gas pre-treatment component 1, the molecular sieve absorption component 2 and the molecular sieve desorption component 3. In this way, the problem that the flue gas coming out of the absorption tower of the capture device cannot be directly discharged in the prior art is solved.

[0046] 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, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0047] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps set forth in these embodiments do not limit the scope of the present application. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, method and equipment known to those of ordinary skill in the relevant field may not be discussed in detail, but in appropriate cases, the technology, method and equipment should be considered as a part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, so that once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0048] In the description of the present application, it should be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present application 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, and therefore cannot be understood as limiting the scope of protection of the present application; the directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0049] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. 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 figure. For example, if the device in the accompanying 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.

[0050] 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 this application.

[0051] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A flue gas post-treatment system, characterized in that: include: A flue gas pretreatment component (1), wherein the flue gas inlet of the flue gas pretreatment component (1) is connected to the gas outlet of the absorption tower, and the flue gas pretreatment component (1) is used to pretreat the flue gas to remove most of the absorbent in the flue gas; A molecular sieve absorption component (2), wherein the smoke inlet of the molecular sieve absorption component (2) is connected to the smoke outlet of the smoke pretreatment component (1), the molecular sieve absorption component (2) is used to absorb the remaining absorbent in the smoke, and the smoke outlet of the molecular sieve absorption component (2) is used to discharge the smoke; A molecular sieve desorption component (3), the molecular sieve desorption component (3) being connected to the liquid outlet of the molecular sieve absorption component (2), the molecular sieve desorption component (3) being used to enable the molecular sieve absorption component (2) to desorb the absorbed absorbent; A control module, wherein the control module is electrically connected to the flue gas pretreatment component (1), the molecular sieve absorption component (2) and the molecular sieve desorption component (3) to control the working states of the flue gas pretreatment component (1), the molecular sieve absorption component (2) and the molecular sieve desorption component (3).

2. The flue gas post-treatment system according to claim 1, characterized in that: The flue gas pretreatment component (1) comprises a water scrubber (11), the flue gas inlet and the flue gas outlet of the flue gas pretreatment component (1) being arranged at the bottom and the top of the water scrubber (11) respectively, and the flue gas passing through the water scrubber (11) contacts the water inside the water scrubber (11).

3. The flue gas post-treatment system according to claim 2, characterized in that: A spray assembly (12) is arranged inside the water washing tower (11), and the spray assembly (12) is located on the upper side of the water washing tower (11) so as to spray water toward the lower side of the water washing tower (11).

4. The flue gas post-treatment system according to claim 2, characterized in that: The molecular sieve absorption component (2) comprises a molecular sieve tower (21), the flue gas inlet and the flue gas outlet of the molecular sieve absorption component (2) are respectively arranged at the bottom and the top of the molecular sieve tower (21), and a molecular sieve material filling part (22) is arranged inside the molecular sieve tower (21) for contacting with the flue gas to absorb the residual absorbent in the flue gas.

5. The flue gas post-treatment system according to claim 4, characterized in that: The molecular sieve absorption component (2) comprises a vacuum pump (23), which is arranged on the connecting pipeline between the flue gas pretreatment component (1) and the molecular sieve absorption component (2) to pump the flue gas into the interior of the molecular sieve tower (21).

6. The flue gas post-treatment system according to claim 4, characterized in that: The molecular sieve desorption component (3) comprises: a heating component (31), at least a portion of which is disposed inside the molecular sieve tower (21) to heat the molecular sieve material filling portion (22), and the control module is connected to the heating component (31) to control the working state of the heating component (31); A recovery tank (32), the inlet of which is connected to the liquid outlet of the molecular sieve tower (21), for receiving the absorbent desorbed from the molecular sieve material filling portion (22).

7. The flue gas post-treatment system according to claim 1, characterized in that: The flue gas post-treatment system comprises: a first control valve (5), the first control valve (5) being arranged at the smoke inlet of the smoke pretreatment component (1) to control the opening and closing of the smoke inlet of the smoke pretreatment component (1); wherein the control module is connected to the first control valve (5) to control the working state of the first control valve (5); A second control valve (6), wherein the second control valve (6) is arranged at the smoke outlet of the smoke pretreatment component (1) to control the opening and closing of the smoke outlet of the smoke pretreatment component (1); wherein the control module is connected to the second control valve (6) to control the working state of the second control valve (6).

8. The flue gas post-treatment system according to claim 4, characterized in that: The flue gas post-treatment system comprises: a third control valve (7), the third control valve (7) being arranged at the liquid outlet of the water scrubber (11) to control the opening and closing of the liquid outlet of the water scrubber (11); wherein the control module is connected to the third control valve (7) to control the working state of the third control valve (7); A fourth control valve (8), wherein the fourth control valve (8) is arranged at the liquid outlet of the molecular sieve tower (21) to control the opening and closing of the liquid outlet of the molecular sieve tower (21); wherein the control module is connected to the fourth control valve (8) to control the working state of the fourth control valve (8).

9. The flue gas post-treatment system according to claim 6, characterized in that: The flue gas post-treatment system comprises a connecting pipe (9), and the connecting pipe (9) comprises: A first flue gas pipeline (91), wherein two ends of the first flue gas pipeline (91) are respectively connected to the flue gas inlet of the flue gas pretreatment component (1) and the gas outlet of the absorption tower; a second flue gas pipeline (92), wherein two ends of the second flue gas pipeline (92) are respectively connected to the flue gas outlet of the flue gas pretreatment component (1) and the flue gas inlet of the molecular sieve absorption component (2), and the vacuum pump (23) is arranged on the second flue gas pipeline (92); A liquid pipeline (93), the inlet of the liquid pipeline (93) is connected to the liquid outlet of the molecular sieve tower (21) and the liquid outlet of the water washing tower (11), and the outlet of the liquid pipeline (93) is connected to the inlet of the recovery tank (32).

10. The flue gas post-treatment system according to claim 9, characterized in that: The connecting pipe (9) comprises a liquid pump (94), and the liquid pump (94) is arranged on the liquid pipe (93) to pump the liquid containing the absorbent to the recovery tank (32); wherein the control module is connected to the liquid pump (94) to control the working state of the liquid pump (94).

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