Cement rotary kiln SCR flue gas denitration soot blowing device

Abstract

The present application relates to the technical field of flue gas denitration, and particularly relates to a cement rotary kiln SCR flue gas denitration soot blowing device and method, which comprises a tube row soot blower, a soot blowing area covers a single catalyst block, one side of the catalyst block is hinged to a catalyst inter-sealing structure as a turnover edge, the tube row soot blower is turned over between a horizontal state and a vertical state based on the turnover edge; a driving mechanism is arranged outside the denitration reactor and has a connecting mechanism, one end of the connecting mechanism is configured to drive, and the other end is connected to an adjacent side of the outside of the turnover edge of the tube row soot blower to drive the tube row soot blower to turn over and switch; when it is necessary to blow soot on the catalyst, the tube row soot blower is turned over to the horizontal state to blow soot. The use of guide rails is cancelled, and the tube row soot blower occupies less space compared with a rake type soot blower. When it is not necessary to blow soot on the catalyst, the tube row soot blower is driven to turn over and stand vertically on the sealing structure between the catalyst blocks, and the smooth flow of flue gas is not affected.

Description

Technical Field

[0001] This invention relates to the field of flue gas denitrification technology, and in particular to a SCR flue gas denitrification and soot blowing device for cement rotary kilns. Background Technology

[0002] SCR (Selective Catalytic Reduction) denitrification technology has become the preferred denitrification technology for cement manufacturing enterprises due to its maturity and high efficiency.

[0003] Due to the small particle size and high viscosity of dust particles in cement rotary kiln flue gas, during actual SCR denitrification catalyst operation, some small-diameter dust particles still deposit and bridge on the catalyst surface after dust removal by the dust collector. This causes blockage of the catalyst's active site channels, reduces the active reaction area, and results in a greater pressure drop. Therefore, to ensure long-term catalyst operation, a soot blowing device becomes an essential piece of equipment for SCR denitrification.

[0004] Currently, enterprises typically use rake-type soot blowers for soot blowing. Compressed air is heated using a dedicated heat exchanger and then sprayed out through the nozzles of the rake tube to move and blow away the deposited dust, keeping the catalyst channels unobstructed. Chinese utility model patent application number 2021205286621 discloses a soot blowing device for SCR denitrification in cement kilns. In order to provide support and guidance, a guide rail needs to be set above the rake-type soot blower. During the flue gas flow, dust will inevitably be left on the rail, reducing the service life of the rail. The main rake tube gradually moves outward during the soot blowing process, and a device for storing the main rake tube needs to be arranged outside the denitrification reactor. Due to its long size, it occupies a lot of space, resulting in wasted space. The rake-type soot blower targets all catalysts in one soot blowing process and is achieved by movement, making it difficult to quickly achieve independent soot blowing of a row or rapid soot blowing of all catalysts. Summary of the Invention

[0005] The purpose of this invention is to provide an SCR flue gas denitrification and soot blowing device for cement rotary kilns, thereby solving the problems existing in the prior art. To achieve the above objective, this invention provides the following technical solution:

[0006] This invention provides an SCR flue gas denitrification and soot blowing device for cement rotary kilns, comprising:

[0007] The tube-type soot blower covers a single catalyst block with one side serving as a hinged flipping edge to the catalyst inter-sealing structure. The tube-type soot blower can flip and switch between horizontal and vertical states with the flipping edge as a reference.

[0008] The drive mechanism is located outside the denitrification reactor and has a connection mechanism. One end is configured with a drive, and the other end is connected to the outer adjacent side of the flipping side of the pipe soot blower to drive the pipe soot blower to flip and switch.

[0009] As a further technical solution, the soot blowers in the same row are connected together to form an integral structure.

[0010] As a further technical solution, the connecting mechanism includes a vertical groove that can move horizontally and linearly and a connecting rod. One end of the connecting rod is rotatably and slidably connected to the vertical groove, and the other end is connected to the pipe soot blower.

[0011] As a further technical solution, the driving mechanism also includes a crank-slider mechanism, wherein the slider drives the horizontal linear motion of the vertical groove.

[0012] As a further technical solution, the movement direction of the vertical groove is perpendicular to the flipping edge.

[0013] As a further technical solution, the pipe-type soot blower includes a rectangular frame and several air jet pipes arranged side by side within the rectangular frame, and several nozzles are provided on the air jet pipes.

[0014] As a further technical solution, the nozzle orifice is funnel-shaped.

[0015] As a further technical solution, steam or compressed air with a set temperature after heat exchange is introduced into the pipe soot blower.

[0016] As a further technical solution, the flipping edge is provided with a flipping shaft, which is hinged to the sealing structure between the catalyst and the flipping shaft.

[0017] As a further technical solution, a support shaft is provided on the opposite side of the flipping edge, and the support shaft and the flipping shaft together support the pipe soot blower in the horizontal state.

[0018] The beneficial effects of the present invention are as follows:

[0019] (1) In this invention, one side of the tube-type sootblower is hinged to the sealing structure between the catalyst blocks as a flipping edge, and can be switched between horizontal and vertical states. When soot blowing is required, the tube-type sootblower can be flipped to the horizontal state for soot blowing. The use of guide rails is eliminated, and it occupies less space compared to the rake-type sootblower. In addition, when soot blowing is not required, the tube-type sootblower is driven to flip and stand upright on the sealing structure between the catalyst blocks, without affecting the smooth flow of flue gas.

[0020] (2) The soot blowing device of the present invention can be flexibly set according to the catalyst block arrangement of different SCR denitrification reactors, is easy to disassemble and replace, and occupies little space. In addition, the tube-type soot blower is designed with the catalyst block as the smallest unit, which can achieve comprehensive coverage and cleaning of the catalyst block, avoid catalyst passivation and abrasion caused by the accumulation of sticky small particles of dust, extend the service life of the catalyst, and ensure the long-term stable operation of the denitrification reactor.

[0021] (3) The present invention arranges a crank-slider mechanism and a connecting mechanism on the outside of the denitrification reactor. Through the cooperation of the two, the drive for switching between the horizontal and vertical states of the pipe soot blower can avoid being arranged above the catalyst, thus avoiding the influence of the drive mechanism on the airflow.

[0022] (4) The soot blowing device of the present invention can realize rapid individual soot blowing of a certain row, or rapid soot blowing of all catalysts, thereby improving the soot blowing efficiency. Attached Figure Description

[0023] The accompanying drawings, which form part of this specification, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute a limitation thereof. It should also be understood that these drawings are for simplicity and clarity and are not necessarily drawn to scale. The invention will now be described and explained with additional features and details using the drawings, wherein:

[0024] Figure 1 A front view of the overall structure of the soot blowing device in an embodiment of the present invention is shown;

[0025] Figure 2 A top view of the overall structure of the soot blowing device in an embodiment of the present invention is shown;

[0026] Figure 3 A side view of the connection structure in an embodiment of the present invention is shown;

[0027] Figure 4 A schematic diagram of the jet pipe structure in an embodiment of the present invention is shown;

[0028] Figure 5 The main view of the rectangular frame in an embodiment of the present invention is shown;

[0029] Figure 6 A side view of a rectangular frame is shown in an embodiment of the present invention;

[0030] Figure 7 A top view of a rectangular frame in an embodiment of the present invention is shown.

[0031] In the diagram: 1. Pipe-type soot blower; 2. Shaft seat; 3. Rectangular frame; 4. Connecting rod; 5. Bearing; 6. Slider; 7. Vertical groove; 8. Horizontal groove; 9. Connecting rod; 10. Crank; 11. Motor; 12. Air inlet port; 13. Nozzle; 14. Tilting shaft; 15. Base plate. Detailed Implementation

[0032] The technical solutions in typical embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.

[0033] like Figures 1-7 As shown, this embodiment provides a cement rotary kiln SCR flue gas denitrification and soot blowing device, including a pipe soot blower 1 and its driving mechanism.

[0034] The blowing area of ​​the tube-type soot blower 1 covers a single catalyst block, and one side of it is hinged to the catalyst inter-block sealing structure as a flipping edge. The tube-type soot blower 1 flips and switches between horizontal and vertical states based on the flipping edge.

[0035] In this embodiment, one side of the tube-type sootblower is hinged to the catalyst chamber sealing structure as a flipping edge, and can switch between horizontal and vertical states. When sootblowing of the catalyst is required, the tube-type sootblower can be flipped to the horizontal state for sootblowing. Figure 1 and Figure 2 As shown. When soot blowing of the catalyst is not required, the tube soot blower is driven to flip and stand upright on the sealing structure between the catalyst blocks, without affecting the smooth flow of flue gas.

[0036] The tube-type soot blowers 1 in the same row are connected together to form an integral structure. The tube-type soot blowers 1 are not only applicable to a single catalyst block, but also, depending on the arrangement of catalyst blocks in different denitrification reactors, the tube-type soot blowers 1 above adjacent catalyst blocks can be connected as a whole, with each row having a drive mechanism to complete the flipping and soot blowing work.

[0037] The soot blowing device in this embodiment can be flexibly configured according to the catalyst block arrangement of different SCR denitrification reactors, is easy to disassemble and replace, and occupies little space. In addition, the tube-type soot blower 1 is designed with the catalyst block as the smallest unit, which can achieve complete coverage and cleaning of the catalyst block, avoiding problems such as catalyst passivation and abrasion caused by the accumulation of sticky small particles of dust, thus extending the service life of the catalyst and ensuring the long-term stable operation of the denitrification reactor.

[0038] like Figure 2As shown, the tube-type soot blower 1 includes a rectangular frame 3 and several jet pipes arranged side by side within the rectangular frame 3, with several nozzles 13 on the jet pipes. The size of the rectangular frame 3 is set according to the size of the catalyst block, sufficient to completely cover and achieve adequate soot blowing. The number of jet pipes and nozzles are both set to achieve adequate soot blowing.

[0039] like Figure 4 As shown, nozzle 13 is made of 304 stainless steel and has a trumpet-shaped opening to increase the radiation range of the compressed air nozzle and thus the blowing area of ​​the soot blower. The air jet pipe is made of stainless steel with a diameter between DN20 and DN30. The air source is steam above 180℃ or compressed air with heat exchange, and its pressure range is 0.5 to 1.6 MPa. To facilitate adjustment of the tilting angle, the air inlet 12 near the tilting axis is connected to the main pipe by a metal flexible hose, and the other end is sealed with a plug.

[0040] In this embodiment, the catalyst block is flipped around its long side as an axis, such as... Figure 2 The right side of the center. The flipping edge is provided with a flipping shaft 14, which is hinged to the sealing structure between the catalyst and the flipping shaft 14.

[0041] like Figure 5 , Figure 6 and Figure 7 As shown, a support shaft is provided on the opposite side of the flipping edge. The support shaft and the flipping shaft 14 together support the pipe-pile soot blower 1 in the horizontal state. The support shaft and the flipping shaft 14 have the same structure and are both equipped with a bearing seat 2. The difference is that the flipping shaft 14 can rotate on the bearing seat, while the bearing seat of the support shaft only serves a supporting function. In addition, both the support shaft and the flipping shaft 14 are equipped with a base plate 15.

[0042] like Figure 1 , Figure 2 and Figure 3 As shown, the drive mechanism is located outside the denitrification reactor and includes a crank-connecting rod mechanism and a connecting mechanism. One end of the connecting mechanism is equipped with a drive mechanism (crank-connecting rod mechanism), and the other end is connected to the outer adjacent side of the flipping edge of the pipe-type sootblower 1 to drive the pipe-type sootblower 1 to flip and switch. In this embodiment, the outer adjacent side of the flipping edge is the short side of the pipe-type sootblower 1.

[0043] like Figure 4 As shown, the connecting mechanism includes a vertical groove 7 capable of horizontal linear movement and a connecting rod 4. One end of the connecting rod 4 is rotatably and slidably connected to the vertical groove 7, and the other end is connected to the pipe-pile soot blower 1 and positioned in the middle of the short side. The connecting rod 4 is L-shaped and achieves rotatable and slidable connection with the vertical groove 7 through a bearing 5. In this embodiment, the direction of movement of the vertical groove 7 is perpendicular to the flipping edge.

[0044] The slider 6 of the crank-slider mechanism drives the horizontal linear motion of the vertical groove 7. The slider 6 slides horizontally in the horizontal groove 8. The slider connects the connecting rod 9 and the crank 10, and the crank 10 is equipped with a motor 11.

[0045] Figure 1 The diagram shows the horizontal sootblower 1 in its blowing state. At this position, bearing 5 is at the bottom of the vertical groove 7, and slider 6 is at the leftmost end of the horizontal groove 8. The front of slider 6 is fixed at the point where it overlaps with the back of the vertical groove 7, allowing bearing 5 to move up and down within the vertical groove 7. After sootblowing is complete, motor 11 drives crank 10 to rotate counterclockwise, while connecting rod 9 pulls slider 6 to slide to the right within the horizontal groove 8. As slider 6 moves to the right, bearing 5 moves upward from the bottom of the vertical groove 7, driving the tube-pile sootblower 1 to rotate clockwise upward via connecting rod 4 until it reaches 90°. At this point, bearing 5 is at the top of the vertical groove 7, and slider 6 is at the rightmost end of the horizontal groove 8. When sootblowing resumes, motor 11 drives crank 10 to rotate clockwise, pushing slider 6 to the left, and bearing 5 moves downward to the bottom, flipping the tube-pile sootblower 1 back to its 0° horizontal position.

[0046] During the operation of the device, the cleaning and soot blowing time is set according to the operating feedback status of the denitrification reactor, and the online real-time cleaning of the denitrification catalyst can be realized through remote control.

[0047] In this embodiment, a crank-slider mechanism and a connecting mechanism are arranged outside the denitrification reactor. Through their cooperation, the drive for switching between the horizontal and vertical states of the pipe soot blower 1 can avoid being positioned above the catalyst, thus preventing the drive mechanism from affecting the airflow. In addition, the drive method in this embodiment is more stable than the method of achieving rotation by driving the rotation shaft alone.

[0048] Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make possible changes and modifications to the technical solutions of the present invention by utilizing the methods and techniques disclosed above without departing from the spirit and scope of the present invention. Therefore, any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solutions of the present invention shall fall within the protection scope of the technical solutions of the present invention.

Claims

1. A cement rotary kiln SCR flue gas denitration soot blower device, characterized in that, The application relates to a pipe row soot blower, which blows soot on a single catalyst block and comprises a rectangular frame, one side of which is connected to a catalyst interlayer sealing structure as a turnover edge, and which is turned over between a horizontal state and a vertical state based on the turnover edge. A driving mechanism is arranged outside the denitration reactor and has a connecting mechanism, one end of which is arranged with a driving device, and the other end of which is connected to the side adjacent to the outer side of the turnover edge of the pipe row soot blower to drive the turnover of the pipe row soot blower. The pipe row soot blowers in the same row are connected together to form an integral structure.

2. The cement rotary kiln SCR flue gas denitration soot blower according to claim 1, characterized in that, The connecting mechanism comprises a vertical slot capable of moving horizontally and linearly and a connecting rod, one end of the connecting rod being connected to the vertical slot in a rotating and sliding mode, and the other end of the connecting rod being connected to the pipe row soot blower.

3. The cement rotary kiln SCR flue gas denitration soot blower according to claim 1, characterized in that, The driving mechanism further comprises a crank slider mechanism, and the slider is used as the driving device for the horizontal and linear movement of the vertical slot.

4. The cement rotary kiln SCR flue gas denitration soot blower of claim 3, characterized in that, The movement direction of the vertical slot is perpendicular to the turnover edge.

5. The cement rotary kiln SCR flue gas denitration soot blower of claim 3, wherein, The pipe row soot blower comprises a plurality of air injection pipes arranged side by side in the rectangular frame, and a plurality of nozzles are arranged on the air injection pipes.

6. The cement rotary kiln SCR flue gas denitration soot blower of claim 1, wherein, The nozzle port is in a horn shape.

7. The cement rotary kiln SCR flue gas denitration soot blower according to claim 6, characterized in that, Steam or compressed air with a set temperature after heat exchange is introduced into the pipe row soot blower.

8. The cement rotary kiln SCR flue gas denitration soot blower of claim 1, wherein, The turnover edge is provided with a turnover shaft, and the turnover shaft is connected to the catalyst interlayer sealing structure in a hinged mode.

9. The cement rotary kiln SCR flue gas denitration soot blower according to claim 1, characterized in that, The opposite side of the turnover edge is provided with a supporting shaft, and the supporting shaft and the turnover shaft jointly support the pipe row soot blower in the horizontal state.

10. The cement rotary kiln SCR flue gas denitration soot blower according to claim 9, characterized in that, ​

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