Pipeline type waste incineration flue gas deamination device
By installing catalyst plates and designing a channel structure inside the flue gas duct, the problems of ammonia slip in SNCR or PNCR and high cost in SCR are solved, achieving low resistance, high efficiency in ammonia removal and cost savings.
Patent Information
- Application Number
- CN202423114079.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-16
- Publication Date
- 2025-12-12
- Estimated Expiration
- 2034-12-16
AI Technical Summary
In existing technologies, the ammonia slip is high when using SNCR or PNCR alone. Increasing the investment and operating costs of SCR is high and the pressure drop is large. Existing technologies cannot effectively solve this problem.
A catalyst plate array is installed inside the flue gas duct. The catalyst plate array extends axially and is coated with catalyst. Multiple channels for flue gas passage are designed to replace SCR, so as to achieve uniform contact between flue gas and catalyst, reduce ammonia slip and pressure drop.
It achieves efficient and low-cost ammonia slip removal, reduces pressure drop, saves investment and operating costs, and avoids the need for additional site requirements.
Smart Images
Figure CN223654767U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of municipal solid waste flue gas treatment technology, and in particular to a pipeline-type waste incineration flue gas ammonia removal device. Background Technology
[0002] Waste flue gas treatment is a crucial aspect of environmental protection, primarily aimed at reducing harmful gas emissions during waste incineration to protect the environment and human health. Flue gas may contain various pollutants, such as particulate matter, sulfur dioxide, and nitrogen oxides (NOx). x Pollutants such as ammonia (NH3) and heavy metals are present. Effective removal of these pollutants is crucial for achieving emission standards for flue gas.
[0003] In existing technologies, SNCR (Selective Non-Catalytic Reduction) or PNCR (Polymer Reduction) is typically used alone for denitrification. SNCR technology uses ammonia water as a reducing agent, which is injected into the furnace at a high temperature (usually 850–1100°C) to react with nitrogen oxides (NOx) in the flue gas. x The nitrogen in the flue gas undergoes a chemical reaction, reducing it to N2 (nitrogen) and H2O (water). PNCR technology uses a polymeric denitrification agent and enhances the denitrification effect by injecting reducing agents such as ammonia. At high temperatures, the polymeric denitrification agent releases amino free radicals, which react with NOx in the flue gas to reduce it. However, whether using SNCR or PNCR technology for denitrification by injecting ammonia, strict control of operating conditions (such as temperature, residence time, and ammonia-to-nitrogen ratio) is necessary to ensure optimal denitrification results; otherwise, excessive ammonia injection may lead to ammonia escape.
[0004] When both denitrification efficiency and ammonia slip are required, SCR (Selective Catalytic Reduction) is needed to reduce nitrogen oxides and ammonia slip. Although SCR has high denitrification efficiency and low ammonia slip, SCR systems are complex, with high investment and operating costs. Furthermore, since the catalyst in the SCR system is the core component of the denitrification reaction, it has a complex pore structure to provide sufficient reaction surface. However, these pore structures also increase airflow resistance, leading to pressure drop. With use, the catalyst surface may accumulate dust, become clogged, or wear down, further increasing airflow resistance and pressure drop. Utility Model Content
[0005] The technical problem to be solved by this utility model is: in order to solve the technical problems of high ammonia slip, high investment and operating costs of SCR and large pressure drop when using SNCR or PNCR alone in the prior art, this utility model provides a pipeline-type waste incineration flue gas deammoniation device, which solves the problem of high ammonia slip caused by excessive injection of reducing agent after SNCR and PNCR, reduces pressure drop and saves investment and operating costs.
[0006] The technical solution adopted by this utility model to solve its technical problem is: a pipeline-type waste incineration flue gas ammonia removal device, which includes: a catalyst plate group and a flue gas pipeline, wherein the catalyst plate group is disposed in the flue gas pipeline and the catalyst plate group extends along the axial direction of the flue gas pipeline;
[0007] The surface of the catalyst plate assembly is coated with a catalyst, and the catalyst plate assembly has multiple channels arranged along the axial direction for flue gas to pass through.
[0008] The specific technical effects are as follows: By placing catalyst assemblies in the post-SNCR or PNCR process, ammonia escape caused by over-spraying of ammonia water in SNCR or PNCR is removed, replacing the newly added SCR, which is more efficient and lower cost than SCR; by creating a channel structure for flue gas passage on the catalyst assemblies and coating the surface of the catalyst assemblies with catalyst, uniform contact between the flue gas and the catalyst is achieved during the passage of the flue gas, thus achieving the purpose of ammonia removal. This channel structure makes the flue gas highly permeable when passing through the catalyst assemblies, achieving the technical effects of low resistance and reduced pressure drop; placing the catalyst assemblies inside the flue gas duct avoids the need for additional space, thus achieving the technical effect of saving investment and costs.
[0009] Furthermore, the catalyst sheet assembly includes multiple catalyst sheets arranged radially in sequence, with the gap between two adjacent catalyst sheets forming the channel, and the gap between the catalyst sheet and the inner wall of the flue gas duct also forming the channel, and each catalyst sheet is coated with a catalyst.
[0010] Furthermore, the adjacent catalyst sheets are arranged as mirror images of each other.
[0011] Furthermore, each catalyst sheet includes multiple first units and multiple second units. Two adjacent first units are connected by a second unit. Two mirrored first units and two mirrored second units together form the channel. The gap space between the two mirrored first units and the inner wall of the flue gas duct also forms the channel, and / or the gap space between the two mirrored second units and the inner wall of the flue gas duct also forms the channel.
[0012] Furthermore, an angle α is formed between adjacent first and second units.
[0013] The specific technical effects are: the multi-piece structure reduces processing costs, and each catalyst piece is designed with multiple segments. An angle α is formed between adjacent first and second units, which allows adjacent catalyst pieces to support each other and ensures that the catalyst pieces are fixedly installed in the flue gas duct and will not tip over.
[0014] Furthermore, the included angle α ranges from 130° to 170°.
[0015] The specific technical effect is that by changing the range of the included angle, the size of the channel can be changed, and the size of the channel is related to the resistance to flue gas flow, so the resistance to flue gas flow can be adjusted according to actual needs.
[0016] Furthermore, the radial cross-section of the channel formed by the two mirrored first units and the two mirrored second units is quadrilateral.
[0017] Furthermore, the catalyst sheet is detachably inserted into the flue gas duct.
[0018] Furthermore, the radial cross-section of the catalyst sheet assembly has a mesh structure.
[0019] Compared with the prior art, the beneficial effects of this utility model are:
[0020] (1) This utility model replaces SCR with a catalyst plate group to remove ammonia escape caused by overspraying of ammonia water in SNCR or PNCR, which is more efficient and lower cost than SCR.
[0021] (2) This utility model opens a channel structure for flue gas to pass through on the catalyst plate group, and coats the surface of the catalyst plate group with catalyst. Therefore, the flue gas achieves uniform contact with the catalyst during the process of passing through the channel, thus achieving the purpose of deammoniation. This channel structure makes the flue gas highly permeable when passing through the catalyst plate group, achieving the technical effects of low resistance and reduced pressure drop.
[0022] (3) This utility model sets the catalyst plate group inside the flue gas duct, avoiding the need for additional space and achieving the technical effect of saving investment and cost. Attached Figure Description
[0023] The present invention will be further described below with reference to the accompanying drawings and embodiments.
[0024] Figure 1 This is a schematic diagram of the structure of this utility model;
[0025] Figure 2 for Figure 1 The main view;
[0026] Figure 3 for Figure 2 Enlarged view of point A in the middle.
[0027] In the diagram: 1. Catalyst plate assembly; 101. Channel; 102. Catalyst plate; 103. First unit; 104. Second unit; 2. Flue gas duct. Detailed Implementation
[0028] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the present invention, and therefore only show the components relevant to the present invention.
[0029] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," etc., indicating the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, features defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.
[0030] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.
[0031] like Figures 1 to 3 The image shown is a preferred embodiment of the present invention. This embodiment of a pipeline-type waste incineration flue gas ammonia removal device includes: a catalyst plate group 1 and a flue gas pipeline 2. The catalyst plate group 1 is disposed inside the flue gas pipeline 2 and extends along the axial direction of the flue gas pipeline 2. The surface of the catalyst plate group 1 is coated with a catalyst, and a plurality of channels 101 for flue gas passage are provided on the catalyst plate group 1 along the axial direction.
[0032] Therefore: by using catalyst plate group 1 instead of SCR to remove ammonia escape caused by over-spraying of ammonia water in SNCR or PNCR, it is more efficient and lower cost than SCR; by creating a channel 101 structure for flue gas passage on the catalyst plate group 1 and coating the surface of the catalyst plate group 1 with catalyst, the flue gas achieves uniform contact with the catalyst during the passage of the channel 101, thus achieving the purpose of ammonia removal. This channel 101 structure makes the flue gas highly permeable when passing through the catalyst plate group 1, achieving the technical effects of low resistance and reduced pressure drop; by setting the catalyst plate group 1 in the flue gas duct 2, the need for additional space is avoided, achieving the technical effect of saving investment and cost.
[0033] In this embodiment, the catalyst sheet group 1 includes a plurality of catalyst sheets 102, which are arranged in a radial sequence. The gap space between two adjacent catalyst sheets 102 forms a channel 101, and the gap space between the catalyst sheet 102 and the inner wall of the flue gas duct 2 also forms a channel 101. All catalyst sheets 102 are coated with catalyst.
[0034] In this embodiment, two adjacent catalyst sheets 102 are arranged as mirror images of each other.
[0035] In this embodiment, each catalyst sheet 102 includes multiple first units 103 and multiple second units 104. Two adjacent first units 103 are connected by a second unit 104. Two mirrored first units 103 and two mirrored second units 104 together form a channel 101. The gap space between the two mirrored first units 103 and the inner wall of the flue gas duct 2 is also formed as a channel 101, and / or the gap space between the two mirrored second units 104 and the inner wall of the flue gas duct 2 is also formed as a channel 101.
[0036] For example, the flue gas duct 2 is cylindrical, and the catalyst plate 102 includes units A1, A2, A3, and A4 connected sequentially from top to bottom. The gap between unit A1, its mirror image, and the inner wall of flue gas duct 2 forms a channel 101, which has a fan-shaped radial cross-section. The gap between two mirror-image units A2 and two mirror-image units A3 also forms a channel 101, which has a quadrilateral radial cross-section. The gap between unit A4, its mirror image, and the inner wall of flue gas duct 2 forms a channel 101, which has a fan-shaped radial cross-section.
[0037] In this embodiment, an included angle α is formed between adjacent first unit 103 and second unit 104.
[0038] Therefore, the multi-piece structure reduces processing costs, and each catalyst piece 102 is designed with multiple segments. An angle α is formed between adjacent first units 103 and second units 104, so that adjacent catalyst pieces 102 support each other and ensure that the catalyst pieces 102 are fixedly installed in the flue gas duct 2 without tipping over.
[0039] In other words, the catalyst sheet 102 adopts this bent multi-segment design, so that the parts of two adjacent catalyst sheets 102 that are close to each other can support each other.
[0040] In this embodiment, the included angle α is 150°.
[0041] Therefore, by changing the range of the included angle, the size of channel 101 can be changed. Moreover, the size of channel 101 is related to the resistance to flue gas flow, and the resistance to flue gas flow can be adjusted according to actual needs.
[0042] In this embodiment, the radial cross-section of the channel 101 formed by the two mirrored first units 103 and the two mirrored second units 104 is quadrilateral.
[0043] In this embodiment, the catalyst sheet 102 is detachably inserted into the flue gas duct 2.
[0044] In this embodiment, the radial cross-section of catalyst sheet group 1 has a mesh structure.
[0045] Compared with the prior art, the beneficial effects of this utility model are:
[0046] (1) This utility model replaces SCR with catalyst plate group 1 to remove ammonia escape caused by overspraying of ammonia water in SNCR or PNCR, which is more efficient and lower cost than SCR.
[0047] (2) This utility model provides a channel 101 structure for flue gas to pass through on the catalyst plate group 1, and a catalyst is coated on the surface of the catalyst plate group 1. Therefore, the flue gas achieves uniform contact with the catalyst during the process of passing through the channel 101, thus achieving the purpose of deammoniation. This channel 101 structure makes the flue gas highly permeable when passing through the catalyst plate group 1, achieving the technical effects of low resistance and reduced pressure drop.
[0048] (3) The present invention sets the catalyst plate group 1 inside the flue gas duct 2, avoiding the need for additional space and achieving the technical effect of saving investment and cost.
[0049] The above description is based on the preferred embodiments of this utility model. Through the above description, those skilled in the art can make various changes and modifications without departing from the technical concept of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined by the scope of the claims.
Claims
1. A pipeline-type waste incineration flue gas ammonia removal device, characterized in that, include: Catalyst plate group (1) and flue gas duct (2), wherein the catalyst plate group (1) is disposed in the flue gas duct (2) and the catalyst plate group (1) extends along the axial direction of the flue gas duct (2); The surface of the catalyst plate group (1) is coated with a catalyst, and the catalyst plate group (1) has a plurality of channels (101) for flue gas to pass through along the axial direction.
2. The pipeline-type waste incineration flue gas ammonia removal device as described in claim 1, characterized in that, The catalyst sheet group (1) includes multiple catalyst sheets (102), which are arranged in a radial sequence. The gap space between two adjacent catalyst sheets (102) forms the channel (101), and the gap space between the catalyst sheet (102) and the inner wall of the flue gas pipe (2) also forms the channel (101). The catalyst sheet (102) is coated with catalyst.
3. The pipeline-type waste incineration flue gas ammonia removal device as described in claim 2, characterized in that, The two adjacent catalyst sheets (102) are arranged as mirror images of each other.
4. The pipeline-type waste incineration flue gas ammonia removal device as described in claim 3, characterized in that, Each catalyst plate (102) includes multiple first units (103) and multiple second units (104). Two adjacent first units (103) are connected by a second unit (104). Two mirrored first units (103) and two mirrored second units (104) together form the channel (101). The gap space between the two mirrored first units (103) and the inner wall of the flue gas duct (2) also forms the channel (101), and / or the gap space between the two mirrored second units (104) and the inner wall of the flue gas duct (2) also forms the channel (101).
5. A pipeline-type waste incineration flue gas ammonia removal device as described in claim 4, characterized in that, An angle α is formed between adjacent first unit (103) and second unit (104).
6. A pipeline-type waste incineration flue gas ammonia removal device as described in claim 5, characterized in that, The included angle α ranges from 130° to 170°.
7. A pipeline-type waste incineration flue gas ammonia removal device as described in claim 4, characterized in that, The radial cross section of the channel (101) formed by the two mirrored first units (103) and the two mirrored second units (104) is quadrilateral.
8. A pipeline-type waste incineration flue gas ammonia removal device as described in claim 2, characterized in that, The catalyst sheet (102) is detachably inserted into the flue gas duct (2).
9. A pipeline-type waste incineration flue gas ammonia removal device as described in claim 1, characterized in that, The radial cross-section of the catalyst sheet group (1) has a mesh structure.