A flue gas compartment flow equalization device for multi-compartment SCR reactor

Abstract

The present invention provides a multi-compartment SCR reactor flue gas compartment flow equalization device, comprising a plurality of SCR reactor bodies arranged side by side, an inlet flue and an outlet flue; the inlet flue is provided with a flow guide component for uniformly introducing the flue gas into each SCR reactor body, a porous plate is provided at the connection between each SCR reactor body and the inlet flue, and a rectifier grid and a catalyst layer are sequentially arranged from top to bottom in the SCR reactor body. Before the flue gas enters the multi-compartment SCR reactor, the invention realizes uniform distribution of the flow field of the flue gas in the multi-compartment SCR reactor by arranging a flow guide component and a porous plate in the inlet flue, so that the denitration system can adapt to the changes in working conditions, realize maintenance without stopping the machine, increase the flexibility of the system, improve the denitration efficiency, and reduce the catalyst wear and ammonia escape.

Description

Technical Field

[0001] The invention belongs to the technical field of flue gas denitrification, and in particular relates to a flue gas compartment flow equalization device for a multi-compartment SCR reactor. Background Art

[0002] Nitrogen oxides (NO X ) is one of the main pollutants in the environment, causing chemical smog and acid rain, which has a huge destructive effect on the ecological environment and human health. X Low emissions. Existing flue gas denitrification methods include air staged combustion, low-nitrogen combustion, selective catalytic reduction (SCR), selective non-catalytic reduction technology (SNCR), SNCR / SCR combination technology, etc. Among them, SCR denitrification has become the most widely used flue gas denitrification technology due to its high denitrification efficiency, good selectivity, mature technology, stable operation, and low operating temperature.

[0003] In order to ensure the good denitration performance of the system, a special SCR denitration reactor is often required. Some projects have limited space for denitration equipment. In the existing technology, single-chamber reactors are generally used. Although the project implementation is relatively simple, the system's adjustability and flexibility are not high, and it must be shut down for maintenance. In order to achieve non-stop maintenance and improve flexibility, the SCR reactor must be designed with compartments. In this way, when a compartment needs to be repaired, the entire system does not need to be shut down, and the site configuration is more flexible. However, this will greatly increase the difficulty of designing a uniform distribution of the flow field in the SCR reactor. The national standard stipulates that the maximum deviation coefficient of the velocity on the first layer of catalyst in the reactor is required to be no more than ±15%. If the flow field is uneven, it may lead to uneven temperature distribution in the reactor and poor material transportation, which will not only cause increased catalyst wear and reduced reaction efficiency, but also may cause serious ammonia escape and air preheater blockage. Summary of the invention

[0004] The purpose of the present invention is to overcome the problems of uneven flow field distribution in the existing multi-bin SCR reactor, which leads to increased catalyst wear, reduced reaction efficiency, serious ammonia slip and air preheater blockage.

[0005] To this end, the present invention provides a multi-compartment SCR reactor flue gas compartment flow equalization device, comprising a plurality of SCR reactor bodies arranged side by side, an inlet flue connected to the air inlet of each SCR reactor body, and an outlet flue connected to the air outlet of each SCR reactor body; a guide component for uniformly introducing flue gas into each SCR reactor body is provided in the inlet flue, a porous plate is provided at the connection between each SCR reactor body and the inlet flue, and a rectifying grid and a catalyst layer are arranged in sequence from top to bottom in the SCR reactor body.

[0006] Furthermore, the inlet flue comprises a smoke inlet pipe, an inlet horizontal pipe and an inlet cone section pipe which are connected in sequence, the smoke inlet pipe is connected to the middle of the inlet horizontal pipe, the inlet horizontal pipe is located directly above the SCR reactor bodies arranged side by side, and the bottom of the inlet horizontal pipe is connected to each SCR reactor body one by one through a plurality of inlet cone section pipes.

[0007] Furthermore, the smoke inlet pipe includes a vertical rectangular section, a horizontal rectangular section and an arc section connecting the vertical rectangular section and the horizontal rectangular section, and the horizontal rectangular section is connected to the inlet horizontal pipe; at least two flue inlet guide plates are provided in the arc section, which are evenly spaced along the radial direction of the arc section, and the flue inlet guide plates are arc-shaped, and their curvature is consistent with the curvature of the arc section.

[0008] Furthermore, the top of the inlet horizontal pipe is in a slope shape that gradually slopes downward from the connection with the smoke inlet pipe to both ends, and the bottom of the inlet horizontal pipe is arranged horizontally.

[0009] Furthermore, the inlet cone section pipeline includes a rectangular pipe section 1 for communicating with the bottom of the inlet horizontal pipe, and a flared pipe section 1 connecting the rectangular pipe section 1 and the inlet of the SCR reactor body.

[0010] Furthermore, the guide assembly includes an inlet horizontal pipe guide plate and an inlet cone section pipe guide plate. The inlet horizontal pipe guide plates include multiple groups, which are respectively arranged at the inlets of the remaining inlet cone section pipes except the inlet cone section pipes connected to the two ends of the inlet horizontal pipe. The inlet cone section pipe guide plates include multiple groups, which are respectively arranged inside each inlet cone section pipe.

[0011] Furthermore, the inlet horizontal pipe guide plate includes an arc-shaped guide plate and a vertical baffle. The arc-shaped surface of the arc-shaped guide plate is biased toward the side away from the smoke inlet pipe, and there are multiple arc-shaped guide plates, which are radially evenly distributed along the arc-shaped surface of the arc-shaped guide plate. The vertical baffle is arranged at the inlet edge of the inlet cone section pipe.

[0012] Furthermore, the inlet cone section pipeline guide plate includes a plurality of front guide plates and side guide plates which are arranged crosswise in the longitudinal and transverse directions, and the front guide plates and the side guide plates are both inclined.

[0013] Furthermore, the porous plate has multiple layers, including a first orifice plate and a second orifice plate. Both the first orifice plate and the second orifice plate are provided with a plurality of pores with a pore size of 50 to 100 mm, and the pores on the first orifice plate are distributed in a criss-cross pattern, and the pores on the second orifice plate are distributed in a rectangular array. The first orifice plate and the second orifice plate are alternately stacked, and the pores of two adjacent layers of orifice plates are arranged in an alternating manner.

[0014] Furthermore, the outlet flue includes an outlet cone section pipe and an outlet horizontal pipe, the top of the outlet horizontal pipe is horizontally arranged, and the bottom of the outlet horizontal pipe is a slope that gradually tilts downward toward the flue gas outlet. The outlet cone section pipe includes a rectangular pipe section 2 for connecting with the top of the outlet horizontal pipe, and a flared pipe section 2 connecting the rectangular pipe section 2 and the outlet of the SCR reactor body.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] The multi-compartment SCR reactor flue gas compartment flow equalization device provided by the present invention realizes uniform distribution of the flow field of flue gas in the multi-compartment SCR reactor before the flue gas enters the multi-compartment SCR reactor by arranging a guide component and a porous plate in the inlet flue, thereby enabling the denitrification system to adapt to changes in operating conditions, realize maintenance without stopping the machine, increase system flexibility, improve denitrification efficiency, and reduce catalyst wear and ammonia escape.

[0017] The present invention will be further described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 : is a schematic diagram of the structure of the flue gas compartment flow equalization device of the multi-compartment SCR reactor in this embodiment;

[0019] Figure 2 yes Figure 1 Schematic diagram of the cross section along the GG direction;

[0020] Figure 3 yes Figure 1 A cross-sectional view of the inlet cone section pipeline corresponding to each chamber;

[0021] Figure 4 Schematic diagram of the structure of the guide plate of the inlet cone section pipeline in this embodiment;

[0022] Figure 5 is a schematic structural diagram of a first orifice plate of the porous plate in this embodiment;

[0023] Figure 6 Schematic diagram of the structure of the second orifice plate of the porous plate in this embodiment.

[0024] Explanation of the reference numerals: 1. Smoke inlet duct; 2. Inlet horizontal duct; 3. Inlet cone duct; 4. Perforated plate; 5. Rectifier grid; 6. SCR reactor body; 7. Catalyst layer; 8. Outlet cone duct; 9. Outlet horizontal duct; 10. Smoke outlet; 11. Inlet cone duct guide plate; 12. Arc guide plate; 13. Vertical baffle; 14. Vertical rectangular section; 15. Arc section; 16. Flue duct inlet guide plate; 17. Horizontal rectangular section; 18. Rectangular pipe section one; 19. Expanded pipe section one; 20. Front guide plate; 21. Side guide plate; 22. First orifice plate; 23. Second orifice plate. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] In the description of the present invention, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0027] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features; in the description of the present invention, unless otherwise specified, "multiple" and "several" mean two or more.

[0028] like Figure 1As shown, this embodiment provides a multi-compartment SCR reactor flue gas compartment flow equalization device, including a plurality of SCR reactor bodies 6 arranged side by side, an inlet flue connected to the air inlet of each SCR reactor body 6, and an outlet flue connected to the air outlet of each SCR reactor body 6; a guide component for uniformly guiding the flue gas into each SCR reactor body 6 is provided in the inlet flue, a porous plate 4 is provided at the connection between each SCR reactor body 6 and the inlet flue, a rectifying grid 5 and a catalyst layer 7 are arranged in sequence from top to bottom in the SCR reactor body 6, the porous plate 4 is fixed on the upper part of the rectifying grid 5, and the flue gas outlet 10 is provided on the outlet flue. In this embodiment, the flue gas passes through the guide component in the inlet flue so that the flue gas enters the corresponding SCR reactor body 6 evenly. At the same time, the porous plate 4 arranged at the inlet of the SCR reactor body 6 allows the flue gas entering the SCR reactor body 6 to be evenly distributed over the entire cross-section to avoid the occurrence of vortices, and the flue gas vertically enters the catalyst layer 7 in the SCR reactor body 6, thereby reducing the wear on the catalyst, reducing the ammonia escape rate, and improving the denitrification efficiency of the entire system, thereby ensuring the stable and efficient operation of the SCR system. At the same time, the use of multiple SCR reactor bodies 6 compartments can enable the denitrification system to adapt to changes in operating conditions, achieve non-stop maintenance, and increase system flexibility.

[0029] In a detailed implementation manner, the inlet flue comprises a smoke inlet pipe 1, an inlet horizontal pipe 2 and an inlet cone section pipe 3 which are connected in sequence, the smoke inlet pipe 1 is connected to the middle of the inlet horizontal pipe 2, the inlet horizontal pipe 2 is located on both sides of the smoke inlet pipe 1, the inlet horizontal pipe 2 is located directly above the SCR reactor bodies 6 arranged side by side, and the bottom of the inlet horizontal pipe 2 is connected to each SCR reactor body 6 one by one through multiple inlet cone section pipes 3, after the flue gas enters the inlet horizontal pipe 2 from the smoke inlet pipe 1, it enters the corresponding SCR reactor body 6 through different inlet cone section pipes 3.

[0030] Specifically, Figure 2As shown, the smoke inlet duct 1 includes a vertical rectangular section 14, a horizontal rectangular section 17 and an arc section 15 connecting the vertical rectangular section 14 and the horizontal rectangular section 17. The horizontal rectangular section 17 is connected to the inlet horizontal duct 2, and transitions through the arc section 15 so that the smoke enters the inlet horizontal duct 2 vertically; at least two flue inlet guide plates 16 are arranged in the arc section 15, which are evenly spaced along the radial direction of the arc section 15. The flue inlet guide plates 16 are arc-shaped, and their curvature is consistent with that of the arc section 15. In this embodiment, there are two flue inlet guide plates 16, and their curvature is 90°. Through the arrangement of the flue inlet guide plates 16, the smoke volume can be evenly distributed on the cross section of the entire horizontal rectangular section 17 during the process of the smoke turning and entering the inlet horizontal duct 2. The top of the inlet horizontal pipe 2 is a slope that gradually slopes downward from the connection point of the smoke inlet pipe 1 to both ends, and the bottom of the inlet horizontal pipe 2 is arranged horizontally. The inclined design of the top of the inlet horizontal pipe 2 is conducive to the transmission of smoke in the inlet horizontal pipe 2 to both ends, thereby ensuring that the smoke can smoothly enter the SCR reactor body 6 at both ends of the inlet horizontal pipe 2. Figure 3 As shown, the inlet cone section pipe 3 includes a rectangular pipe section 18 for communicating with the bottom of the inlet horizontal pipe 2, and an expanded pipe section 19 connecting the rectangular pipe section 18 and the inlet of the SCR reactor body 6. The inlet horizontal pipe 2 and the SCR reactor body 6 are connected by the rectangular pipe section 18 and the expanded pipe section 19, so that the flue gas in the inlet horizontal pipe 2 turns and enters the SCR reactor body 6.

[0031] As one of the embodiments, the guide assembly includes an inlet horizontal pipe guide plate and an inlet cone section pipe guide plate 11. The inlet horizontal pipe guide plates are provided in multiple groups, one group being respectively arranged at the inlet of each inlet cone section pipe 3, while no inlet horizontal pipe guide plates are arranged at the inlet of the inlet cone section pipe 3 at both ends of the inlet horizontal pipe 2. Under the action of the inlet horizontal pipe guide plates, the smoke in the inlet horizontal pipe 2 enters the inlet cone section pipe 3 vertically and evenly; the inlet cone section pipe guide plates 11 are provided in multiple groups, each of which is respectively arranged inside the inlet cone section pipe 3, and the smoke in the inlet cone section pipe 3 is further evenly distributed through the inlet cone section pipe guide plates 11.

[0032] Specifically, Figure 1 and Figure 2 As shown, the inlet horizontal duct guide plate includes an arcuate guide plate 12 and a vertical baffle 13. The arcuate surface of the arcuate guide plate 12 is arranged to be biased toward the side away from the smoke inlet duct 1, and there are multiple arcuate guide plates 12, which are evenly spaced radially along the arcuate surface of the arcuate guide plate 12. The vertical baffle 13 is arranged at the inlet edge of the inlet cone section duct 3. In this embodiment, the SCR reactor body has six as an example. Figure 1As shown, they are warehouse Ⅰ, warehouse Ⅱ, warehouse Ⅲ, warehouse Ⅳ, warehouse Ⅴ, and warehouse Ⅵ, respectively. The smoke inlet duct 1 faces warehouse Ⅲ. Warehouse Ⅱ is provided with two 110° arc guide plates 12 deviated to the left and one 1100mm high vertical baffle 13. Warehouse Ⅲ is provided with two 130° arc guide plates 12 deviated to the flue entrance and one 700mm high vertical baffle 13. Warehouse Ⅳ is provided with three 110° arc guide plates 12 deviated to the right. Warehouse Ⅴ is provided with three 110° arc guide plates 12 deviated to the right. No guide plates are provided at the entrances of warehouses Ⅰ and Ⅵ. Figure 3 and Figure 4 As shown, the inlet cone section pipeline guide plate 11 is arranged at the connection between the rectangular pipe section 18 and the expanded pipe section 19 of the inlet cone section pipeline 3, including a plurality of front guide plates 20 and side guide plates 21 arranged crosswise in the longitudinal and transverse directions, and the front guide plates 20 and the side guide plates 21 are both inclined. For different SCR reactor bodies 6, the inclination direction and angle of the front guide plates 20 and the side guide plates 21 are adjusted according to the actual flue gas volume and other working conditions to ensure the uniform distribution of the flow field when the flue gas enters the expanded pipe section 19 from the rectangular pipe section 18. In this embodiment, as shown in Figure 1 As shown, the front guide plates 20 of bins I and II are biased to the left, the front guide plates 20 of bins III and IV are symmetrically distributed, and the front guide plates 20 of bins V and VI are biased to the right; Figure 3 As shown, the side guide plates 21 of bins I, II, IV, V and VI are biased to the right, and the side guide plates 21 of bins III are biased to the left.

[0033] A porous plate 4 is provided at the connection between the inlet cone section pipe 3 and the SCR reactor body 6 to further uniformly distribute the flue gas flow field into the SCR reactor body 6. Specifically, the porous plate 4 has multiple layers, including a first orifice plate 22 and a second orifice plate 23. The first orifice plate 22 and the second orifice plate 23 are both provided with a plurality of pores with a pore size of 50 to 100 mm. Figure 4 As shown, the pores on the first orifice plate 22 are distributed in a crisscross pattern. Figure 5 As shown, the pores on the second orifice plate 23 are distributed in a rectangular array, and the first orifice plate 22 and the second orifice plate 23 are alternately stacked, and the pores of the two adjacent layers of orifice plates are staggered. Through this structural design of the porous plate 4, the turbulence effect on the flue gas is enhanced, thereby further enabling the flue gas to be evenly distributed on the entire cross-section of the SCR reactor body 6.

[0034] like Figure 1As shown, the outlet flue includes an outlet cone section pipe 8 and an outlet horizontal pipe 9, the top of the outlet horizontal pipe 9 is horizontally arranged, and the bottom of the outlet horizontal pipe 9 is a slope gradually inclined downward toward the flue gas outlet 10, and the outlet cone section pipe 8 includes a rectangular pipe section 2 for communicating with the top of the outlet horizontal pipe 9, and a flared pipe section 2 connecting the rectangular pipe section 2 and the outlet of the SCR reactor body 6; the SCR reactor body 6 and the outlet horizontal pipe 9 are connected by the flared pipe section 2 and the rectangular pipe section, so that the flue gas after the catalytic denitrification reaction in the SCR reactor body 6 turns and enters the outlet horizontal pipe 9, and is then discharged from the flue gas outlet 10, and the design of the inclined bottom of the outlet horizontal pipe 9 is more conducive to the flow of flue gas in the outlet horizontal pipe 9 to the flue gas outlet 10.

[0035] In summary, the multi-compartment SCR reactor flue gas compartment flow equalization device provided by the present invention realizes uniform distribution of the flow field of flue gas in the multi-compartment SCR reactor by arranging a guide component and a porous plate in the inlet flue before the flue gas enters the multi-compartment SCR reactor, thereby enabling the denitrification system to adapt to changes in operating conditions, achieve maintenance without stopping the machine, increase system flexibility, improve denitrification efficiency, and reduce catalyst wear and ammonia escape.

[0036] The above examples are merely illustrative of the present invention and do not constitute a limitation on the protection scope of the present invention. All designs that are the same or similar to the present invention fall within the protection scope of the present invention.

Claims

1. A multi-compartment SCR reactor flue gas compartment flow equalization device, characterized in that: It comprises a plurality of SCR reactor bodies arranged side by side, an inlet flue connected to the air inlet of each SCR reactor body, and an outlet flue connected to the air outlet of each SCR reactor body; a guide assembly for uniformly guiding flue gas into each SCR reactor body is arranged in the inlet flue, a porous plate is arranged at the connection between each SCR reactor body and the inlet flue, and a rectifying grid and a catalyst layer are arranged in sequence from top to bottom in the SCR reactor body; The inlet flue comprises a smoke inlet pipe, an inlet horizontal pipe and an inlet cone pipe which are connected in sequence, the smoke inlet pipe is connected to the middle of the inlet horizontal pipe, the inlet horizontal pipe is located directly above the SCR reactor bodies arranged side by side, and the bottom of the inlet horizontal pipe is connected to each SCR reactor body one by one through a plurality of inlet cone pipes; the smoke inlet pipe comprises a vertical rectangular section, a horizontal rectangular section and an arc section connecting the vertical rectangular section and the horizontal rectangular section, the horizontal rectangular section is connected to the inlet horizontal pipe; at least two flue inlet guide plates are arranged in the arc section, which are evenly spaced along the radial direction of the arc section, and the flue inlet guide plates are arc-shaped, and their curvature is consistent with that of the arc section; The guide assembly includes an inlet horizontal pipe guide plate and an inlet cone pipe guide plate. There are multiple groups of inlet horizontal pipe guide plates, which are respectively arranged at the inlets of the remaining inlet cone pipes except the inlet cone pipes connected to the two ends of the inlet horizontal pipe. There are multiple groups of inlet cone pipe guide plates, which are respectively arranged inside each inlet cone pipe. The inlet horizontal pipe guide plate includes an arc guide plate and a vertical baffle. The arc guide plate extends from the top of the inlet cone pipe to the smoke side, and there are multiple arc guide plates, which are radially equidistantly distributed along the arc surface of the arc guide plate, and the vertical baffle is arranged at the inlet edge of the inlet cone pipe.

2. A multi-chamber SCR reactor flue gas compartment flow equalization device as claimed in claim 1, characterized in that: The top of the inlet horizontal pipe is in a slope shape that gradually slopes downward from the connection point of the smoke inlet pipe to both ends, and the bottom of the inlet horizontal pipe is arranged horizontally.

3. The multi-chamber SCR reactor flue gas compartment flow equalization device according to claim 1, characterized in that: The inlet cone section pipeline comprises a rectangular pipe section 1 for communicating with the bottom of the inlet horizontal pipe, and a flared pipe section 1 connecting the rectangular pipe section 1 and the inlet of the SCR reactor body.

4. The multi-chamber SCR reactor flue gas compartment flow equalization device according to claim 1, characterized in that: The inlet cone section pipeline guide plate includes a plurality of front guide plates and side guide plates which are arranged crosswise in the longitudinal and transverse directions, and the front guide plates and the side guide plates are both arranged obliquely.

5. The multi-chamber SCR reactor flue gas compartment flow equalization device according to claim 1, characterized in that: The porous plate has multiple layers, including a first orifice plate and a second orifice plate. The first orifice plate and the second orifice plate are both provided with a plurality of pores with a pore size of 50 to 100 mm, and the pores on the first orifice plate are distributed in a criss-cross pattern, and the pores on the second orifice plate are distributed in a rectangular array. The first orifice plate and the second orifice plate are alternately stacked and placed, and the pores of two adjacent layers of orifice plates are arranged in a staggered manner.

6. The multi-chamber SCR reactor flue gas compartment flow equalization device according to claim 1, characterized in that: The outlet flue comprises an outlet cone section pipe and an outlet horizontal pipe, the top of the outlet horizontal pipe is horizontally arranged, and the bottom of the outlet horizontal pipe is a slope gradually inclined downward toward the flue gas outlet direction, and the outlet cone section pipe comprises a rectangular pipe section 2 for communicating with the top of the outlet horizontal pipe, and a flared pipe section 2 connecting the rectangular pipe section 2 and the outlet of the SCR reactor body.

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