A combined catalytic degradation and activated carbon adsorption dioxin control device

Abstract

This invention discloses a combined dioxin control device based on catalytic degradation and activated carbon adsorption, comprising: a shell; a first flange installed at the inlet of the shell; a supporting grid fixed inside the shell; a dioxin catalytic degradation module disposed on the supporting grid, with an annular gap between the module and the inner wall of the shell; a flue gas baffle located above the dioxin catalytic degradation module and covering the annular gap; an activated carbon support mesh fixed inside the shell and located below the supporting grid; an activated carbon layer disposed on the activated carbon support mesh; an activated carbon addition window opened on the surface of the shell and located between the supporting grid and the activated carbon support mesh; and a second flange installed at the outlet of the shell. This invention has the advantages of rapid dioxin removal and high removal efficiency.

Description

Technical Field

[0001] This application relates to the field of municipal solid waste thermal treatment technology, and in particular to a device for the combined control of dioxins through catalytic degradation and activated carbon adsorption. Background Technology

[0002] Small-scale, simple municipal solid waste thermal treatment equipment often emits high concentrations of dioxins (PCDD / Fs) in its flue gas due to factors such as simple flue gas purification systems and incomplete combustion. The flue gas emissions of most of these equipment fail to meet the emission requirements of the "Standard for Pollutant Control of Municipal Solid Waste Incineration". Summary of the Invention

[0003] The purpose of this application is to provide a combined dioxin control device that combines catalytic degradation and activated carbon adsorption to solve the problem of excessive dioxin emissions from existing small-scale waste thermal treatment equipment.

[0004] According to an embodiment of this application, a dioxin co-control device combining catalytic degradation and activated carbon adsorption is provided, characterized in that it comprises:

[0005] case;

[0006] The first flange is installed at the inlet of the housing;

[0007] The support grille is fixed inside the housing.

[0008] The dioxin catalytic degradation module is mounted on the supporting grid and has an annular gap between it and the inner wall of the shell.

[0009] A flue gas baffle is located above the dioxin catalytic degradation module and covers the annular gap;

[0010] An activated carbon support mesh is fixed inside the housing and located below the support grid.

[0011] An activated carbon layer is disposed on the activated carbon support mesh;

[0012] An activated carbon addition window is provided on the surface of the housing and located between the supporting grid and the activated carbon support mesh; and

[0013] The second flange is installed at the outlet of the housing.

[0014] Furthermore, the shell is cylindrical, with both the inlet and outlet ends having a tapered structure.

[0015] Furthermore, the flue gas velocity after the inlet of the shell is 0.16 times the flue gas velocity at the inlet.

[0016] Furthermore, the closing structure is a square closing structure.

[0017] Furthermore, the shell is made of Q235 steel, Q355 steel or No. 20 steel, preferably Q235 steel.

[0018] Furthermore, the first flange is a square flange.

[0019] Furthermore, the height of the activated carbon layer is less than the distance between the activated carbon addition window and the activated carbon support mesh.

[0020] Furthermore, the second flange is a square flange.

[0021] Furthermore, the height of the dioxin catalytic degradation module should ensure that the empty bed residence time is ≥7s.

[0022] Furthermore, it also includes an induced draft fan, which draws air from the second flange.

[0023] The technical solutions provided by the embodiments of this application may include the following beneficial effects:

[0024] As can be seen from the above embodiments, this application uses a flange to connect the flue, which allows for convenient disassembly of the device and replacement of internal components. The flue gas baffle is located above the dioxin catalytic degradation module and covers the annular gap, effectively preventing flue gas from escaping directly through the module gap without passing through the catalytic layer. This serves as a flue gas guide, ensuring that the flue gas effectively passes through the dioxin catalytic degradation module, improving the degradation efficiency of dioxins in the flue gas. It also makes the position of the dioxin catalytic degradation module more stable inside the shell, preventing positional changes due to flue gas flow. The shell has an activated carbon addition window, allowing for the addition of activated carbon and control of the activated carbon layer height without affecting the upper dioxin catalytic degradation module. This can solve the problem of substandard dioxin emissions from existing decentralized small-scale waste thermal treatment equipment, achieving effective dioxin degradation and removal, and reducing the environmental burden.

[0025] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and do not limit this application. Attached Figure Description

[0026] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0027] Figure 1 This is a schematic diagram of the structure of a dioxin combined control device for catalytic degradation and activated carbon adsorption provided in an embodiment of the present invention;

[0028] Figure 2 yes Figure 1 Sectional view along line AA;

[0029] Figure 3 yes Figure 1 Sectional view along the BB direction;

[0030] Figure 4 yes Figure 1 C-axis sectional view;

[0031] Figure 5 yes Figure 1 Enlarged view of a section at point D;

[0032] Figure 6 This is a structural schematic diagram of an application scenario of a dioxin co-control device based on catalytic degradation and activated carbon adsorption provided in an embodiment of the present invention;

[0033] In the diagram: 1. Shell; 2. First flange; 3. Second flange; 4. Support grid; 5. Activated carbon support mesh; 6. Activated carbon addition window; 7. Dioxin catalytic degradation module; 8. Flue gas baffle; 9. Activated carbon layer; 10. Annular gap; 11. Exhaust fan; 12. Bag filter; 13. Chimney. Detailed Implementation

[0034] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended claims.

[0035] The terminology used in this application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The singular forms “a,” “the,” and “the” used in this application and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used herein refers to and includes any or all possible combinations of one or more of the associated listed items.

[0036] It should be understood that although the terms first, second, third, etc., may be used in this application to describe various information, such information should not be limited to these terms. These terms are only used to distinguish information of the same type from one another. For example, without departing from the scope of this application, first information may also be referred to as second information, and similarly, second information may also be referred to as first information. Depending on the context, the word "if" as used herein may be interpreted as "when," "when," or "in response to determination."

[0037] like Figures 1-5 As shown, this embodiment of the invention provides a combined control device for dioxins through catalytic degradation and activated carbon adsorption, comprising: a housing 1; a first flange 2 installed at the inlet of the housing 1; a supporting grid 4 fixed inside the housing 1; a dioxin catalytic degradation module 7 disposed on the supporting grid 4, with an annular gap 10 between the module and the inner wall of the housing 1; a flue gas baffle 8 located above the dioxin catalytic degradation module 7 and covering the annular gap 10; an activated carbon support mesh 5 fixed inside the housing 1 and located below the supporting grid 4; an activated carbon layer 9 disposed on the activated carbon support mesh 5; an activated carbon addition window 6 opened on the surface of the housing 1 and located between the supporting grid 4 and the activated carbon support mesh 5; and a second flange 3 installed at the outlet of the housing 1.

[0038] As can be seen from the above embodiments, this application uses a flange to connect the flue, which allows for convenient disassembly of the device and replacement of internal components. The flue gas baffle 8, located above the dioxin catalytic degradation module 7 and covering the annular gap 10, effectively prevents flue gas from escaping directly through the module gap without passing through the catalytic layer, thus guiding the flue gas flow and ensuring its effective passage through the dioxin catalytic degradation module 7. This improves the degradation efficiency of dioxins in the flue gas and also makes the position of the dioxin catalytic degradation module 7 more stable inside the shell 1, preventing positional changes due to flue gas flow. The shell has an activated carbon addition window, allowing for the addition of activated carbon and control of the activated carbon layer 9 height without affecting the upper dioxin catalytic degradation module 7. This solution addresses the problem of substandard dioxin emissions from existing decentralized small-scale waste thermal treatment equipment, achieving effective dioxin degradation and removal, and reducing environmental burden.

[0039] In one embodiment, the housing 1 is cylindrical, with both the inlet and outlet ends having tapered structures. The tapered inlet and outlet structures allow for flexible matching with various flue structures and enable adjustment of the inlet and outlet flue gas flow rates to meet the overall flue gas flow rate requirements of the catalytic purification device.

[0040] Furthermore, the flue gas velocity after the inlet of the housing 1 is 0.16 times that at the inlet. This ensures that the flue gas can be distributed relatively quickly and evenly inside the housing after entering it, so that the pressure drop inside the housing decreases evenly according to the height, and ensures that each small module in the dioxin catalytic degradation module 7 can stably catalytically degrade dioxins.

[0041] Furthermore, the tapering structure is square to accommodate the square tail flue structure of most heat treatment devices.

[0042] In one embodiment, the shell 1 is made of Q235 steel, Q355 steel or No. 20 steel, preferably Q235 steel.

[0043] In one embodiment, the first flange 2 is a square flange. The second flange 3 is a square flange. Because the tail flue structures of various heat treatment devices differ, the flanges are designed with an open structure to meet the requirements of different flue structures and ensure the applicability of the overall device.

[0044] In one embodiment, the height of the activated carbon layer 9 is less than the distance between the activated carbon addition window 6 and the activated carbon support mesh 5, so as to prevent the addition window from being blocked by the activated carbon layer, thus making it impossible to observe the internal situation.

[0045] In one embodiment, the height of the dioxin catalytic degradation module 7 should ensure that the empty bed residence time is ≥7s, so as to better ensure that the catalytic efficiency of the dioxin catalytic degradation module 7 can reach the maximum.

[0046] In one embodiment, the system further includes an induced draft fan 11, which draws air from the second flange 3. The induced draft fan 11 serves to guide the flow, ensuring continuous flow in the tail flue and ultimately ensuring the smooth discharge of tail flue gas from the chimney 13.

[0047] The working principle of the device provided in this embodiment of the invention is as follows:

[0048] like Figure 6 As shown, during use, the first flange 2 and the second flange 3 are respectively installed in the tail flue of the waste heat treatment equipment to ensure that external air and dust cannot enter the device while degradation and adsorption operations are being carried out, thus ensuring the efficiency of dioxin removal.

[0049] Using flue gas from a simple, small-scale waste thermal treatment device as raw material, the entire device is arranged after the bag filter 12 of the simple, small-scale waste thermal treatment device to eliminate the influence of fly ash on the dioxin degradation efficiency of the catalytic layer. In addition, the flue gas flow rate is limited to ensure the residence time of the flue gas in the catalytic layer. The low-temperature flue gas at the tail end is introduced into the device provided in this embodiment from above, and the flue gas flows from top to bottom under the action of the tail exhaust fan 11. The flue gas passes through the dioxin catalytic degradation module 7, where dioxin-like substances are catalytically degraded. The degraded flue gas continues to pass through the activated carbon layer 9 below, where residual dioxins in the flue gas are physically adsorbed and removed. The purified flue gas flows out from the bottom of the device and is discharged into the atmosphere.

[0050] Other embodiments of this application will readily occur to those skilled in the art upon consideration of the specification and practice of the disclosure herein. This application is intended to cover any variations, uses, or adaptations of this application that follow the general principles of this application and include common knowledge or customary techniques in the art not disclosed herein. The specification and embodiments are to be considered exemplary only, and the true scope and spirit of this application are indicated by the claims.

[0051] It should be understood that this application is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this application is limited only by the appended claims.

Claims

1. A device for combined control of dioxins through catalytic degradation and activated carbon adsorption, characterized in that, include: Shell (1); The first flange (2) is installed at the inlet of the housing (1); Support grid (4) is fixed inside the housing (1); The dioxin catalytic degradation module (7) is disposed on the support grid (4) and there is an annular gap (10) between it and the inner wall of the shell (1). The flue gas baffle (8) is located above the dioxin catalytic degradation module (7) and covers the annular gap (10). An activated carbon support mesh (5) is fixed inside the housing (1) and located below the support grid (4); An activated carbon layer (9) is disposed on the activated carbon support mesh (5); An activated carbon addition window (6) is opened on the surface of the housing (1) and located between the support grid (4) and the activated carbon support mesh (5); as well as The second flange (3) is installed at the outlet of the housing (1); The shell (1) is cylindrical, and the inlet and outlet at both ends are tapered structures; the height of the activated carbon layer (9) is less than the distance between the activated carbon addition window (6) and the activated carbon support mesh (5).

2. The apparatus according to claim 1, characterized in that, The flue gas velocity after the inlet of the shell (1) is 0.16 times the flue gas velocity at the inlet.

3. The apparatus according to claim 1, characterized in that, The closing structure is a square closing.

4. The apparatus according to claim 1, characterized in that, The shell (1) is made of Q235 steel, Q355 steel or No. 20 steel.

5. The apparatus according to claim 1, characterized in that, The first flange (2) is a square flange.

6. The apparatus according to claim 1, characterized in that, The second flange (3) is a square flange.

7. The apparatus according to claim 1, characterized in that, The height of the dioxin catalytic degradation module (7) should ensure that the empty bed residence time is ≥7s.

8. The apparatus according to claim 1, characterized in that, Also includes: An induced draft fan (11) draws air from the second flange (3).

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