Vertical SCR (Selective Catalytic Reduction) denitration device for coke oven tail gas

Abstract

The utility model relates to a vertical SCR (Selective Catalytic Reduction) denitration device for coke oven tail gas, which comprises a vertically arranged denitration tower, a partition plate with a cross-shaped cross section is fixedly arranged in the denitration tower, and the denitration tower is divided into four denitration units by the partition plate; the top of each denitration unit is fixedly communicated with an air inlet pipe with an air inlet valve, the bottom of each denitration unit is fixedly communicated with an exhaust pipe with an exhaust valve, the top ends of the air inlet pipes are communicated with the same air inlet header pipe, and the bottom ends of the exhaust pipes are communicated with the same exhaust header pipe; a plurality of catalyst mechanisms which are detachably connected with the corresponding denitration units are distributed in each denitration unit at intervals up and down. According to the utility model, a plurality of denitration units which do not influence each other are matched for denitration, so that the device is more convenient and practical.

Description

Technical Field

[0001] The utility model belongs to the technical field of denitration, and particularly relates to a vertical SCR denitration device for coke oven tail gas. Background Art

[0002] At present, when performing SCR denitration treatment on the tail gas of a coke oven, equipment such as a denitration tower is required. The common denitration towers are mainly of two types: horizontal and vertical. The horizontal one needs to be placed horizontally, occupying a relatively large surface area, while the vertical one is placed vertically and saves more space, so it is used more frequently. However, a conventional vertical denitration tower usually has only one denitration unit that runs through from top to bottom and is composed of multiple layers of catalysts. When problems such as blockage, wear, or loss of activity occur in the catalyst layer, it is often necessary to stop the furnace to perform operations such as replacing the catalyst, which is inconvenient to use and not conducive to the overall denitration operation, and thus needs to be improved. Content of the Utility Model

[0003] In view of this, the purpose of the utility model is to provide a vertical SCR denitration device for coke oven tail gas, which can cooperate for denitration through multiple independent denitration units to solve the above problems.

[0004] To achieve the above purpose, the technical solution adopted by the utility model is: a vertical SCR denitration device for coke oven tail gas, including a vertically arranged denitration tower. A partition with a cross-shaped cross-section is fixedly arranged in the denitration tower. The partition divides the denitration tower into four denitration units. An inlet pipe with an inlet valve is fixedly connected to the top of each denitration unit, and an exhaust pipe with an exhaust valve is fixedly connected to the bottom of each denitration unit. The top end of the inlet pipe is connected to the same inlet main pipe, and the bottom end of the exhaust pipe is connected to the same exhaust main pipe. A number of catalyst mechanisms that are detachably connected to the corresponding denitration unit are arranged at intervals up and down in each denitration unit.

[0005] Preferably, the catalyst mechanism includes a vertically arranged support plate. A catalyst box formed by splicing five grid plates is fixedly provided on one side of the support plate. The catalyst box is filled with a catalyst. A through groove is formed on the side wall of the denitration unit corresponding to the catalyst box. The catalyst box extends into the corresponding denitration unit through the corresponding through groove and abuts against the inner side wall of the corresponding denitration unit. The support plate abuts against the outer side wall of the corresponding denitration unit, and fixing blind holes are formed on both the upper and lower sides thereof. First single-rod hydraulic cylinders are vertically and fixedly provided on the outer side walls of the denitration units on both the upper and lower sides of the support plate. The piston rod of the first single-rod hydraulic cylinder corresponds to and is inserted into the fixing blind hole on the same side. A square positioning groove is formed on the side of the support plate away from the catalyst box. Limiting blind holes are formed on both the front and rear groove walls of the positioning groove. A square annular guide rail is fixedly provided on the peripheral side of the bottom of the denitration tower. An electric slider is slidably provided on the guide rail. A second single-rod hydraulic cylinder is vertically and fixedly provided on the top of the electric slider. The piston rod of the second single-rod hydraulic cylinder faces upward and is fixedly connected to a support. A third single-rod hydraulic cylinder is horizontally and fixedly provided through the support. The piston rod of the third single-rod hydraulic cylinder faces the denitration tower and is fixedly connected to a vertical plate. A square positioning block is fixedly provided on the side of the vertical plate away from the third single-rod hydraulic cylinder. A double-rod hydraulic cylinder is arranged inside the positioning block. The two piston rods of the double-rod hydraulic cylinder can extend out of the positioning block. The positioning block can be inserted into the positioning groove. The two piston rods of the double-rod hydraulic cylinder can correspond to and be inserted into the two limiting blind holes on the corresponding positioning groove.

[0006] Preferably, the catalyst box is adapted to the corresponding through groove.

[0007] Preferably, the piston rod of the first single-rod hydraulic cylinder is adapted to the corresponding fixing blind hole.

[0008] Preferably, the positioning block is adapted to the corresponding positioning groove.

[0009] Preferably, the piston rods of the double-rod hydraulic cylinder are adapted to the corresponding limiting blind holes.

[0010] The beneficial effects of the present utility model are as follows: When denitrifying the coke oven tail gas, four denitrification units are arranged in a one-spare-three mode. That is, during operation, the intake valves and exhaust valves corresponding to three groups of denitrification units are in the open state, and the intake valves and exhaust valves corresponding to the other group of denitrification units are in the closed state, so that three groups of denitrification units are in the working state and the other group of denitrification units is not working. The intake main pipe is connected to the tail gas input pipeline, so that the coke oven tail gas mixed with the reducing agent can enter the intake main pipe through the tail gas input pipeline, and under the transportation of three groups of intake pipes, it is shunted into the corresponding three groups of denitrification units, and then flows through multiple catalyst mechanisms from top to bottom, and reacts under the catalytic action of the catalyst mechanism to achieve SCR denitrification treatment. The treated tail gas is then discharged through the corresponding exhaust pipes and gathered into the exhaust main pipe. The exhaust main pipe is connected to the tail gas output pipeline, so that the denitrified tail gas can be transported to the subsequent process through the tail gas transportation pipeline. When it is necessary to replace the catalyst mechanism in a certain denitrification unit, the intake valve and exhaust valve of the spare denitrification unit can be opened to make the spare denitrification unit work, and the intake valve and exhaust valve of the denitrification unit to be replaced can be closed, so that the catalyst mechanism therein can be replaced, and the entire denitrification device still remains in the one-spare-three state. And so on, the catalyst mechanism in any one of the four groups of denitrification units can be replaced while always maintaining the one-spare-three state of the four groups of denitrification units. Moreover, the detachable setting of the catalyst mechanism can further reduce the replacement difficulty, improve the replacement efficiency, shorten the replacement time, make the overall use more flexible and convenient, be more conducive to the overall denitrification operation, and be more practical. Description of the Drawings

[0011] Figure 1 is the front view structural schematic diagram of the present utility model;

[0012] Figure 2 is the front view sectional structural schematic diagram of the present utility model;

[0013] Figure 3 is the top view structural schematic diagram of the present utility model;

[0014] Figure 4 is the front view structural schematic diagram of the denitrification tower of the present utility model;

[0015] Figure 5 is the front view structural schematic diagram of the catalyst mechanism of the present utility model;

[0016] Figure 6 is the right view structural schematic diagram of the support plate of the present utility model;

[0017] Figure 7 is the front view structural schematic diagram of the second single-rod hydraulic cylinder and its upper structure of the present utility model;

[0018] Figure 8 is the left view structural schematic diagram of the vertical plate of the present utility model.

[0019] Reference numerals in the figure: 1 is a denitration tower, 2 is a partition plate, 3 is a denitration unit, 4 is an intake valve, 5 is an intake pipe, 6 is an exhaust valve, 7 is an exhaust pipe, 8 is an intake main pipe, 9 is an exhaust main pipe, 10 is a catalyst mechanism, 11 is a support plate, 12 is a catalyst box, 13 is a catalyst, 14 is a through groove, 15 is a fixed blind hole, 16 is a first single-rod hydraulic cylinder, 17 is a positioning groove, 18 is a limiting blind hole, 19 is a guide rail, 20 is an electric slider, 21 is a second single-rod hydraulic cylinder, 22 is a support, 23 is a third single-rod hydraulic cylinder, 24 is a vertical plate, 25 is a positioning block, 26 is a double-rod hydraulic cylinder. Detailed implementation manners

[0020] The present utility model will be further described in detail below with reference to the accompanying drawings and specific implementation manners:

[0021] As Figures 1 to 8 shown, a vertical SCR denitration device for coke oven tail gas includes a vertically arranged denitration tower 1. A partition plate 2 with a cross-shaped cross-section is fixedly arranged in the denitration tower 1. The partition plate 2 divides the denitration tower 1 into four denitration units 3. An intake pipe 5 with an intake valve 4 is fixedly connected to the top of each denitration unit 3, and an exhaust pipe 7 with an exhaust valve 6 is fixedly connected to the bottom of each denitration unit 3. The top end of the intake pipe 5 is communicated with the same intake main pipe 8, and the bottom end of the exhaust pipe 7 is communicated with the same exhaust main pipe 9. A plurality of catalyst mechanisms 10 detachably connected to the corresponding denitration unit 3 are arranged at intervals up and down in each denitration unit 3;

[0022] When denitrifying the coke oven tail gas, four denitrification units 3 are configured as one standby and three in use. That is, during operation, the intake valves 4 and exhaust valves 6 corresponding to three groups of denitrification units 3 are in the open state, while the intake valves 4 and exhaust valves 6 corresponding to the other group of denitrification units 3 are in the closed state, so that three groups of denitrification units 3 are in the working state and the other group of denitrification units 3 is not working. The intake main pipe 8 is connected to the tail gas input pipeline, so that the coke oven tail gas mixed with the reducing agent can enter the intake main pipe 8 through the tail gas input pipeline, and under the transportation of three groups of intake pipes 5, it is diverted into the corresponding three groups of denitrification units 3, and then flows through the multi-layer catalyst mechanism 10 from top to bottom, and reacts under the catalytic action of the catalyst mechanism 10 to achieve SCR denitrification treatment. The treated tail gas is then discharged through the corresponding exhaust pipes 7 and collected in the exhaust main pipe 9. The exhaust main pipe 9 is connected to the tail gas output pipeline, so that the denitrified tail gas can be transported to the subsequent process through the tail gas transportation pipeline. When it is necessary to replace the catalyst mechanism 10 in a certain denitrification unit 3, the intake valve 4 and exhaust valve 6 of the standby denitrification unit 3 can be opened to make the standby denitrification unit 3 work, and the intake valve 4 and exhaust valve 6 of the denitrification unit 3 to be replaced can be closed, and then the catalyst mechanism 10 inside it can be replaced, so that the entire denitrification device still remains in the state of one standby and three in use. By analogy, the catalyst mechanism 10 in any group of denitrification units 3 can be replaced while always maintaining the state of one standby and three in use for the four groups of denitrification units 3. Moreover, the detachable setting of the catalyst mechanism 10 can further reduce the replacement difficulty, improve the replacement efficiency, shorten the replacement time, make the overall use more flexible and convenient, be more conducive to the overall denitrification operation, and be more practical.

[0023] In this embodiment, the catalyst mechanism 10 includes a vertically arranged support plate 11. On one side of the support plate 11, a catalyst box 12 formed by splicing five grille plates is fixedly provided. A catalyst 13 is filled in the catalyst box 12. A through groove 14 is formed in the side wall of the denitration unit 3 corresponding to the catalyst box 12. The catalyst box 12 extends into the corresponding denitration unit 3 through the corresponding through groove 14 and abuts against the inner side wall of the corresponding denitration unit 3. The support plate 11 abuts against the outer side wall of the corresponding denitration unit 3, and fixed blind holes 15 are formed on both the upper and lower sides thereof. On the outer side walls of the denitration unit 3 on both the upper and lower sides of the support plate 11, first single-rod hydraulic cylinders 16 are vertically fixedly provided. The piston rods of the first single-rod hydraulic cylinders 16 correspond to the fixed blind holes 15 on the same side and are inserted therein. A square positioning groove 17 is formed on the side of the support plate 11 away from the catalyst box 12. Limiting blind holes 18 are formed on the front and rear groove walls of the positioning groove 17. A square annular guide rail 19 is fixedly provided on the peripheral side of the bottom of the denitration tower 1. An electric slider 20 is slidably provided on the guide rail 19. A second single-rod hydraulic cylinder 21 is vertically fixedly provided on the top of the electric slider 20. The piston rod of the second single-rod hydraulic cylinder 21 faces upward and is fixedly connected to a support 22. A third single-rod hydraulic cylinder 23 is horizontally and fixedly penetrated through the support 22. The piston rod of the third single-rod hydraulic cylinder 23 faces the denitration tower 1 and is fixedly connected to a vertical plate 24. A square positioning block 25 is fixedly provided on the side of the vertical plate 24 away from the third single-rod hydraulic cylinder 23. A double-rod hydraulic cylinder 26 is arranged inside the positioning block 25. The two piston rods of the double-rod hydraulic cylinder 26 can extend out of the positioning block 25. The positioning block 25 can be inserted into the positioning groove 17, and the two piston rods of the double-rod hydraulic cylinder 26 can correspond to the two limiting blind holes 18 on the corresponding positioning groove 17 and be inserted therein;

[0024] In use, the tail gas can flow through the plurality of catalyst boxes 12 filled with catalysts 13 in the corresponding denitration unit 3 from top to bottom, so as to cooperate to achieve SCR denitration. When it is necessary to replace the catalyst mechanism 10 in a certain denitration unit 3, after closing the corresponding intake valve 4 and exhaust valve 6, the electric slider 20 can be operated first to drive the components thereon to move integrally along the guide rail 19 to the outside of the corresponding denitration unit 3. Then, the second single-rod hydraulic cylinder 21 is operated to extend its piston rod, so as to drive the support 22 to move upward integrally until the positioning block 25 is aligned with the positioning groove 17 on the support plate 11 of the corresponding denitration unit 3. Next, the third single-rod hydraulic cylinder 23 is operated to extend its piston rod, so as to drive the positioning block 25 to move towards the corresponding positioning groove 17 until the positioning block 25 is inserted in place in the corresponding positioning groove 17. After that, the double-rod hydraulic cylinder 26 is operated to extend its two piston rods until the two piston rods are inserted in place in the corresponding limit blind holes 18, so as to realize the fixed connection between the positioning block 25 and the support plate 11. Then, the two first single-rod hydraulic cylinders 16 corresponding to the support plate 11 are operated to contract their piston rods to reset, so as to release the plug-in fixation of the support plate 11. Next, the third single-rod hydraulic cylinder 23 is operated to contract its piston rod, so as to extract the corresponding catalyst box 12 from the corresponding denitration unit 3. Then, the second single-rod hydraulic cylinder 21 is operated to contract its piston rod, so as to drive the extracted catalyst box 12 to move downward to a suitable position. After that, the double-rod hydraulic cylinder 26 is operated again to contract its piston rod and withdraw from the corresponding limit blind hole 18, so as to release the fixed connection between the positioning block 25 and the support plate 11. Then, the catalyst box 12 is removed from the positioning block 25, and the disassembly of the catalyst mechanism 10 can be completed. When installing a new catalyst mechanism 10, only need to align the positioning groove 17 on the new catalyst mechanism 10 with the positioning block 25 and insert it in place first. After completing the fixed connection between the positioning block 25 and the support plate 11 according to the foregoing steps, the height of the catalyst mechanism 10 is adjusted in place by the telescopic movement of the piston rod of the second single-rod hydraulic cylinder 21. Then, by the telescopic movement of the piston rod of the third single-rod hydraulic cylinder 23, the catalyst mechanism 10 is inserted in place in the corresponding denitration unit 3. After that, the two corresponding first single-rod hydraulic cylinders 16 are operated to extend their piston rods until they are inserted in place in the corresponding fixed blind holes 15. After the support plate 11 is plugged and fixed, and then the connection between the positioning block 25 and the support plate 11 is released as described above, the fixed installation of the new catalyst mechanism 10 can be completed, and the installation is stable, without affecting subsequent use. And so on, the flexible and convenient overall disassembly, replacement of the catalyst mechanisms 10 of each layer of each denitration unit 3 can be realized. The operation is simple, which can effectively reduce the labor intensity and operation difficulty of workers, save more time and effort, be more beneficial to the overall denitration operation, and be more practical.

[0025] In this embodiment, the catalyst box 12 is adapted to the corresponding through groove 14 to ensure the smooth plug-in installation of the catalyst mechanism 10.

[0026] In this embodiment, the piston rod of the first single-rod hydraulic cylinder 16 is adapted to the corresponding fixed blind hole 15 to ensure the smooth fixed installation of the catalyst mechanism 10.

[0027] In this embodiment, the positioning block 25 is adapted to the corresponding positioning groove 17 to ensure the smooth plug-in installation of the positioning block 25.

[0028] In this embodiment, the piston rod of the double-rod hydraulic cylinder 26 is adapted to the corresponding limit blind hole 18 to ensure the smooth fixed installation between the positioning block 25 and the support plate 11.

[0029] The above are only the preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A vertical SCR denitration device for coke oven tail gas, characterized in that, It includes a vertically arranged denitration tower. Inside the denitration tower, a partition with a cross-shaped cross-section is fixedly installed. The partition divides the denitration tower into four denitration units. At the top of each denitration unit, an intake pipe with an intake valve is fixedly connected, and at the bottom of each denitration unit, an exhaust pipe with an exhaust valve is fixedly connected. The top end of the intake pipe is connected to the same intake main pipe, and the bottom end of the exhaust pipe is connected to the same exhaust main pipe. Inside each denitration unit, a number of catalyst mechanisms detachably connected to the corresponding denitration unit are arranged at intervals up and down.

2. The vertical SCR denitration device for coke oven tail gas according to claim 1, characterized in that, The catalyst mechanism includes a vertically arranged support plate. On one side of the support plate, a catalyst box formed by splicing five grid plates is fixedly installed. The catalyst box is filled with a catalyst. A through groove is opened on the side wall of the denitration unit corresponding to the catalyst box. The catalyst box extends into the corresponding denitration unit through the corresponding through groove and abuts against the inner side wall of the corresponding denitration unit. The support plate abuts against the outer side wall of the corresponding denitration unit, and fixing blind holes are opened on both the upper and lower sides thereof. On the outer side walls of the denitration unit on both the upper and lower sides of the support plate, first single-rod hydraulic cylinders are vertically fixedly installed. The piston rod of the first single-rod hydraulic cylinder corresponds to and is inserted into the fixing blind hole on the same side. On the side of the support plate away from the catalyst box, a square positioning groove is opened. Limiting blind holes are opened on the front and rear groove walls of the positioning groove. A square annular guide rail is fixedly installed on the peripheral side of the bottom of the denitration tower. An electric slider is slidably arranged on the guide rail. On the top of the electric slider, a second single-rod hydraulic cylinder is vertically fixedly installed. The piston rod of the second single-rod hydraulic cylinder faces upward and is fixedly connected to a support. A third single-rod hydraulic cylinder is horizontally and fixedly installed through the support. The piston rod of the third single-rod hydraulic cylinder faces the denitration tower and is fixedly connected to a vertical plate. On the side of the vertical plate away from the third single-rod hydraulic cylinder, a square positioning block is fixedly installed. A double-rod hydraulic cylinder is arranged inside the positioning block. The two piston rods of the double-rod hydraulic cylinder can extend out of the positioning block. The positioning block can be inserted into the positioning groove. The two piston rods of the double-rod hydraulic cylinder can correspond to and be inserted into the two limiting blind holes on the corresponding positioning groove.

3. The vertical SCR denitration device for coke oven tail gas according to claim 2, wherein, The catalyst box is adapted to the corresponding through groove.

4. The vertical SCR denitration device for coke oven tail gas according to claim 2, wherein, The piston rod of the first single-rod hydraulic cylinder is adapted to the corresponding fixing blind hole.

5. The vertical SCR denitration device for coke oven tail gas according to claim 2, characterized in that, The positioning block is adapted to the corresponding positioning groove.

6. The vertical SCR denitration device for coke oven tail gas according to claim 2, wherein, The piston rod of the double-rod hydraulic cylinder is adapted to the corresponding limiting blind hole.

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