Sintering tail gas purification device

Abstract

The utility model discloses a sintering tail gas purification device which comprises an ammonia spraying grid and a catalyst layer which are arranged in a denitration tower, the ammonia spraying grid comprises a plurality of closely arranged unit pipes, ammonia feeding branch pipes and ammonia spraying sleeves are coaxially arranged in the unit pipes, the ammonia spraying sleeves are rotatably arranged outside the ammonia feeding branch pipes in a sleeving mode, and the catalyst layer is arranged on the catalyst layer. A plurality of radial injection rings and tangential injection rings are evenly distributed on the ammonia injection sleeve in the axial direction, each radial injection ring comprises a plurality of radial holes evenly distributed in the circumferential direction of the cross section of the ammonia injection sleeve, and each tangential injection ring comprises a plurality of tangential holes evenly distributed in the circumferential direction of the cross section of the ammonia injection sleeve. Open seams corresponding to the radial injection rings and the tangential injection rings are formed in the ammonia feeding branch pipes; at least two driving blade groups are also arranged on the outer wall of the ammonia spraying sleeve; ammonia spraying of the radial spraying ring and the tangential spraying ring is accompanied in the rotating process of the ammonia spraying sleeve, the ammonia spraying and mixing process can be uniformly and fully completed in the process that sintering tail gas penetrates through the unit pipe, and the overall denitration efficiency is stable.

Description

Technical Field

[0001] This utility model relates to the field of tail gas purification technology in the metallurgical industry, specifically to a combustion tail gas purification device. Background Technology

[0002] Sintering machines are suitable for sintering operations in large-scale ferrous metallurgical sintering plants. They are mainly used in large and medium-sized sintering plants for sintering iron ore powder. During operation, a large amount of exhaust gas is generated. The purification of exhaust gas requires processes such as dust removal and denitrification. However, existing sintering machine flue gas denitrification technologies (such as SCR denitrification technology) have the problem of uneven ammonia injection, which leads to fluctuations in denitrification efficiency and affects the overall purification effect of sintering. Therefore, a sintering exhaust gas purification device that can solve the above problems is needed. Utility Model Content

[0003] In view of the problems existing in the background art, the purpose of this utility model is to provide a combustion end gas purification device, which effectively solves the problems existing in the background art.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A combustion end gas purification device includes an ammonia injection grid and a catalyst layer disposed within a denitrification tower. The catalyst layer is located above the ammonia injection grid. The ammonia injection grid includes multiple closely arranged unit tubes. An ammonia supply branch pipe and an ammonia injection sleeve are coaxially disposed within each unit tube. The ammonia injection sleeve is rotatably fitted over the ammonia supply branch pipe. Multiple radial injection rings and tangential injection rings are evenly distributed axially on the ammonia injection sleeve. The radial injection rings and tangential injection rings are arranged alternately. The radial injection rings include multiple radial holes evenly distributed circumferentially along the cross-section of the ammonia injection sleeve. The tangential injection rings include multiple tangential holes evenly distributed circumferentially along the cross-section of the ammonia injection sleeve. The ammonia supply branch pipe is provided with slits corresponding to the radial and tangential injection rings. At least two drive blade sets are also disposed on the outer wall of the ammonia injection sleeve, with the two drive blade sets respectively located near the upper and lower ends of the ammonia injection sleeve.

[0006] Furthermore, the unit pipe includes a Laval nozzle section and an ammonia injection section, with the Laval nozzle section located below the ammonia injection section and the ammonia injection sleeve located inside the ammonia injection section.

[0007] Furthermore, two limiting discs are fixed on the outer wall of the ammonia delivery branch pipe, and the ammonia injection sleeve is located between the two limiting discs.

[0008] Furthermore, the limiting disc is provided with multiple radial flow channel slots on the side facing the ammonia injection sleeve, and the radial flow channel slots are evenly distributed along the circumference of the limiting disc; the edge of the ammonia injection sleeve and the ammonia delivery branch pipe is provided with a chamfer.

[0009] Furthermore, the outer wall of the ammonia delivery branch pipe is provided with a flow guiding component that corresponds one-to-one with the radial injection ring and the tangential injection ring. The flow guiding component includes two symmetrically arranged ring plates, the outer periphery of which is close to the inner wall of the ammonia injection sleeve.

[0010] This utility model has the following beneficial technical effects:

[0011] In this invention, ammonia is injected along with radial and tangential injection rings during the rotation of the ammonia injection sleeve. As the combustion tail gas passes through the unit tube, the ammonia injection and mixing process can be completed uniformly and fully, resulting in stable overall denitrification efficiency. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure of an embodiment of the present utility model;

[0013] Figure 2 This is a schematic diagram of the unit tube structure in an embodiment of this utility model;

[0014] Figure 3 for Figure 2 Enlarged view of a section at point A

[0015] Figure 4 This is a schematic diagram of the assembly structure of the drive blade assembly and the ammonia injection sleeve in an embodiment of this utility model. Detailed Implementation

[0016] The embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and should not be construed as limiting the scope of this utility model.

[0017] In the description of this utility model, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," "front end," "rear end," "head," and "tail," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and 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, be constructed or operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0018] like Figure 1-4As shown, the combustion gas purification device described in this embodiment includes an ammonia injection grid 1 and a catalyst layer 2 installed inside the denitrification tower. The catalyst layer 2 is located above the ammonia injection grid 1. The ammonia injection grid 1 includes multiple closely arranged unit pipes 3, all of which together fill the cross-section of the denitrification tower. An ammonia supply branch pipe 4 and an ammonia injection sleeve 5 are coaxially arranged inside the unit pipe 3. The ammonia supply branch pipe 4 supplies ammonia water through an ammonia supply main pipe 6. The ammonia injection sleeve 5 is rotatably sleeved outside the ammonia supply branch pipe 4. Specifically, two limiting devices are fixed on the outer wall of the ammonia supply branch pipe 4. Positioning plate 7, ammonia injection sleeve 5 is located between two limiting plates 7, there is an assembly gap between ammonia injection sleeve 5 and ammonia delivery branch pipe 4, ammonia injection sleeve 5 can rotate relative to ammonia delivery branch pipe 4; multiple radial flow channel slots 8 are provided on the side of limiting plate 7 facing ammonia injection sleeve 5, the radial flow channel slots 8 are evenly distributed around the circumference of limiting plate 7; a chamfer 9 is provided at the edge of the ammonia injection sleeve 5 and the ammonia delivery branch pipe 4, some ammonia water in ammonia injection sleeve 5 can enter the radial flow channel slots 8 on limiting plate 7 through the chamfer 9 at the edge of ammonia injection sleeve 5 and then flow out;

[0019] Multiple radial and tangential injection rings are evenly distributed along the axial direction on the ammonia injection sleeve 5. The radial and tangential injection rings are arranged alternately. The radial injection rings include multiple radial holes 10 evenly distributed along the circumference of the cross-section of the ammonia injection sleeve 5. The tangential injection rings include multiple tangential holes 11 evenly distributed along the circumference of the cross-section of the ammonia injection sleeve 5. The ammonia delivery branch pipe 4 is provided with slits 12 corresponding to the radial and tangential injection rings. Ammonia water flows out into the ammonia injection sleeve 5 through the slits 12. The outer wall of the ammonia delivery branch pipe 4 is provided with flow guiding components corresponding to the radial and tangential injection rings. The flow guiding components include two symmetrically arranged ring plates 13. The outer periphery of the ring plates 13 is close to the inner wall of the ammonia injection sleeve 5. The application of the flow guiding components can allow as much ammonia water as possible to reach the radial and tangential injection rings.

[0020] Three drive blade groups 14 are also provided on the outer wall of the ammonia injection sleeve 5. Two of the drive blade groups 14 are located near the upper and lower ends of the ammonia injection sleeve 5, respectively, and the other drive blade group 14 is located in the middle of the ammonia injection sleeve 5. When the combustion tail gas flows from bottom to top through the unit tube 3, it can help the ammonia injection sleeve 5 to rotate by passing through the drive blade group 14. When the combustion tail gas flows through the drive blade group 14, the direction of rotation of the ammonia injection sleeve 5 is the same as the direction of rotation of the ammonia injection sleeve 5 caused by the tangential injection ring. In order to further enhance the rotation effect of the ammonia injection sleeve 5, the unit tube 3 is set as a fixed Laval nozzle section and an ammonia injection section. The Laval nozzle section is located below the ammonia injection section, and the ammonia injection sleeve 5 is located inside the ammonia injection section. After being accelerated by the Laval nozzle section, the combustion tail gas can better drive the ammonia injection sleeve 5.

[0021] The working principle of this embodiment is as follows:

[0022] The combustion gas passes through each unit pipe 3 from bottom to top. At the same time, ammonia water is sent out through the ammonia supply branch pipe 4 and the ammonia injection sleeve 5 and mixed with the combustion gas. After mixing, it reaches the catalyst layer 2 for reaction. Compared with the prior art, in this embodiment, the ammonia injection sleeve 5 is accompanied by the injection of ammonia by radial injection ring and tangential injection ring during rotation. The combustion gas can complete the ammonia injection and mixing process evenly and fully during the process of passing through the unit pipe 3, and the overall denitrification efficiency is stable.

[0023] The embodiments of this utility model are given for illustrative and descriptive purposes only, and are not intended to be exhaustive or to limit the utility model to the forms disclosed. Many modifications and variations will be apparent to those skilled in the art. The embodiments were chosen and described in order to better illustrate the principles and practical applications of this utility model, and to enable those skilled in the art to understand this utility model and design various embodiments with various modifications suitable for a particular purpose.

Claims

1. A combustion end gas purification device, characterized in that, The system includes an ammonia injection grid and a catalyst layer disposed within a denitrification tower. The catalyst layer is located above the ammonia injection grid. The ammonia injection grid comprises multiple closely arranged unit tubes. An ammonia supply branch pipe and an ammonia injection sleeve are coaxially disposed within each unit tube. The ammonia injection sleeve is rotatably fitted over the ammonia supply branch pipe. Multiple radial and tangential injection rings are evenly distributed axially on the ammonia injection sleeve. The radial and tangential injection rings are arranged alternately. The radial injection rings include multiple radial holes evenly distributed circumferentially along the cross-section of the ammonia injection sleeve. The tangential injection rings include multiple tangential holes evenly distributed circumferentially along the cross-section of the ammonia injection sleeve. The ammonia supply branch pipe is provided with slits corresponding to the radial and tangential injection rings. At least two drive blade sets are also disposed on the outer wall of the ammonia injection sleeve, with the two drive blade sets respectively located near the upper and lower ends of the ammonia injection sleeve.

2. The combustion end gas purification device according to claim 1, characterized in that, The unit pipe includes a Laval nozzle section and an ammonia injection section, with the Laval nozzle section located below the ammonia injection section and the ammonia injection sleeve located inside the ammonia injection section.

3. The combustion end gas purification device according to claim 1, characterized in that, Two limiting discs are fixed on the outer wall of the ammonia delivery branch pipe, and the ammonia injection sleeve is located between the two limiting discs.

4. The combustion end gas purification device according to claim 3, characterized in that, The limiting disc has multiple radial flow channel slots on the side facing the ammonia injection sleeve, and the radial flow channel slots are evenly distributed along the circumference of the limiting disc; the edge of the ammonia injection sleeve assembled with the ammonia delivery branch pipe is chamfered.

5. The combustion end gas purification device according to claim 1, characterized in that, The outer wall of the ammonia delivery branch pipe is provided with a flow guiding component that corresponds one-to-one with the radial injection ring and the tangential injection ring. The flow guiding component includes two symmetrically arranged ring plates, the outer periphery of which is close to the inner wall of the ammonia injection sleeve.

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