CN209771835U - Adjustable grid system applied to SCR denitration system - Google Patents
Adjustable grid system applied to SCR denitration system Download PDFInfo
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- CN209771835U CN209771835U CN201920429716.1U CN201920429716U CN209771835U CN 209771835 U CN209771835 U CN 209771835U CN 201920429716 U CN201920429716 U CN 201920429716U CN 209771835 U CN209771835 U CN 209771835U
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Abstract
The utility model discloses an adjustable grid system applied to an SCR denitration system, which comprises a plurality of adjustable grid units arranged in an SCR body, wherein a plurality of rows of adjustable grid units are arranged in parallel along the width direction of a flue, and two rows of adjustable grid units are arranged in parallel along the depth direction of the flue; every adjustable grid unit includes a plurality of grid boards, the fixed line frame of a set of parallel in SCR body is fixed at both ends, grid connecting rod and control lever, a plurality of grid boards are connected on fixed line frame along flue degree of depth direction parallel arrangement and the lug through both sides, each grid board sub-unit connection is on the grid connecting rod, the one end of grid connecting rod stretches out the SCR body and is connected with the one end of control lever, the middle part of control lever is rotated and is connected on the SCR body, the grid connecting rod drives each grid board angle of adjustment in step along with the rotation of control lever. The utility model discloses an adjustment grid board and flue vertical cross section's contained angle and the water conservancy diversion effect of grid board, effectively solve denitration export NOx and distribute uneven and the problem that the ammonia escape rate is on the high side.
Description
Technical Field
the utility model relates to an adjustable grid system for SCR deNOx systems.
Background
The emission of nitrogen oxides in a thermal power plant has great influence on the ecological environment, and the realization of the emission reduction of the nitrogen oxides in the thermal power plant is the key point of the total emission control of the nitrogen oxides. The main measure of controlling NOx emission of the thermal power generating unit is to add a denitration system. Currently, the flue gas denitration technology of Selective Catalytic Reduction (SCR) has become a main means for controlling NOx emission of a coal-fired power plant boiler due to the advantages of high denitration rate (up to 90%), reliable technology, simple structure and the like, and the SCR denitration method has outstanding advantages, but has many problems in the actual operation process.
The ammonia injection device of the SCR denitration system mainly comprises a vortex plate type and a grid type, and a vortex static mixed injection technology is adopted in more than 50% of coal-fired units in China, the technology has a simple and reliable structure, an ammonia injection pipe is not easy to block, but during ammonia injection optimization adjustment, the problem that the concentration deviation of NOx at the outlet of most vortex plate type denitration systems along the depth direction of a flue is large, the ammonia injection amount of the vortex plate ammonia injection system in the width direction of the flue can be adjusted, and the problem that the concentration distribution deviation of NOx in the depth direction of the flue is large cannot be adjusted is found; the grid type ammonia spraying technology system is relatively complex, and because the arrangement of the ammonia spraying pipes is more, the diameter of each pipe is relatively small, the ammonia spraying pipes and the regulating valves are easy to crystallize and block, and the ammonia spraying effect is influenced. No matter what ammonia spraying method is adopted, when the ammonia escape rate is high due to uneven ammonia spraying, the problems of blockage of a downstream air preheater, low-temperature corrosion of a cold end, dust sticking of an electric dust removal pole plate and the like can be caused, the stable operation and the load carrying capacity of a unit are seriously influenced, and even the serious consequences such as unplanned shutdown are caused.
Factors influencing uneven ammonia injection and high ammonia escape rate comprise a flue gas velocity field, concentration field distribution and ammonia injection amount distribution, the distribution of a flue gas double field at the inlet of a catalyst is mainly influenced by guide plates before and after ammonia injection, particularly the influence of the guide plate after ammonia injection (the inlet of the catalyst) is large, the guide effect of the guide plate after ammonia injection is not ideal under the actual condition, in addition, because of the influence of inertia, the flue gas distribution at the inlet of the catalyst is extremely uneven, the flue gas amount close to a boiler side is smaller, the flue gas amount close to a dust remover side is larger, in order to control the NOx concentration distribution and the ammonia escape rate at a denitration outlet, only an uneven ammonia injection method can be adopted during the actual operation optimization, the opening degree of an ammonia injection valve of a corresponding area is adjusted according to the difference between the flue gas amount and the NOx concentration of different areas, the ammonia injection amount is increased in the area with high NOx concentration, otherwise, the ammonia injection amount is reduced, the problems that the NOx distribution is uneven and the ammonia escape rate is high can be fundamentally solved only through the combined action of ammonia injection amount distribution and flue gas double-field distribution.
In order to solve the problems of poor flow equalizing effect of a catalyst inlet flue gas guide plate and serious non-uniformity of a catalyst inlet flue gas concentration field and a velocity field, the invention provides an adjustable grid system applied to an SCR denitration system.
Disclosure of Invention
An object of the utility model is to overcome among the prior art catalyst entry flue gas guide plate the effect of flow equalizing poor, catalyst entry flue gas concentration field and the serious uneven problem in speed field, provide an adjustable grid system for SCR deNOx systems.
The utility model discloses a following technical scheme can realize:
an adjustable grid system applied to an SCR denitration system comprises a plurality of adjustable grid units arranged in an SCR body, wherein the adjustable grid units are arranged in a plurality of rows in parallel along the width direction of a flue and in two rows in parallel along the depth direction of the flue; each adjustable grid unit comprises a plurality of grid plates, a group of parallel fixed line frames, grid connecting rods and control rods, wherein the two ends of each fixed line frame are fixed in the SCR body, the grid connecting rods are connected with the grid plates, the grid connecting rods are connected with the push-pull grid connecting rods, the grid plates are arranged in parallel along the depth direction of a flue and are connected to the fixed line frames in a rotating mode through lifting lugs on the two sides, the lower portions of the grid plates are connected to the grid connecting rods in a rotating mode, one ends of the grid connecting rods extend out of the SCR body and are connected with one ends of the control rods in a rotating mode, the middle portions of the control rods are connected to the SCR body in. Each group of adjustable grating units can be independently controlled, the adjustment accuracy is high, and the operation is convenient.
Furthermore, the lifting lugs are arranged in the middle of two sides of the grid plate, grid fixing grooves matched with the lifting lugs are formed in the fixing travelling frame, and the grid plate rotates by taking the lifting lugs as shafts.
Furthermore, a fixing frame is arranged on the SCR body, and the middle part of the control rod is rotatably connected to the fixing frame through a rotating shaft.
Furthermore, a dial scale for indicating the rotation angle of the control rod is arranged on the fixing frame. The adjusting range of the control rod is minus 60 degrees to plus 60 degrees, and the adjusting precision is 10 degrees.
Furthermore, one end of the grid connecting rod extends out of the SCR body and is connected with one end of the control rod through a hinge.
Furthermore, the plurality of grating plates in each adjustable grating unit are divided into two kinds of grating plates with different heights, the small grating plate is positioned at the outer side, and the large grating plate is positioned in the middle of the small grating plate. The matching use and arrangement mode of the large grid plate and the small grid plate can ensure that the flow guide effect of the grid plate can reach the optimum.
Furthermore, the bottom of the small grid plate is provided with a connecting pin, the lower part of the large grid plate is provided with a connecting pin 1/4 away from the bottom, and the grid connecting rod is provided with a pin hole matched with the connecting pin.
further, the size of the small grid plates is 500mm × 500mm × 10mm, and the size of the large grid plates is 500mm × 1000mm × 10 m.
further, the distance between adjacent adjustable grid units in the width direction of the flue ranges from 200mm ~ 300mm, and the distance between two rows of adjustable grid units at the head and the tail and the inner wall of the SCR body ranges from 200mm ~ 300 mm.
Further, the distance between the two adjustable grid units in the depth direction of the flue is 500 mm.
The utility model has the advantages that:
The utility model provides an adjustable grid system comprises a plurality of adjustable grid units, which drive a grid connecting rod to move back and forth through a control rod, and drive a grid plate to rotate by taking a lifting lug as an axis when the grid connecting rod moves back and forth, so that the included angle between the grid plate and the vertical section of a flue is adjusted, the resistance of the local area of the flue is changed, and the flue gas velocity field is changed; on the other hand, the flow direction of partial flue gas is changed by utilizing the flow guiding effect of the grating plates, so that the flue gas amount and the flue gas concentration in the region are changed along with the flow direction, the aim of adjusting a flue gas velocity field and a flue gas concentration field is fulfilled, and the problems of uneven distribution of NOx at a denitration outlet and high ammonia escape rate are solved. In addition, each group of adjustable grating units can be independently controlled, the adjustment accuracy is high, and the operation is convenient.
Drawings
FIG. 1 is a front view of an adjustable grill system;
FIG. 2 is a schematic view of an adjustable grill linkage (section I in FIG. 1);
FIG. 3 is a schematic view of the adjustable grill swinging-60;
FIG. 4 is a top view of an adjustable grill arrangement;
FIG. 5 is a detailed view of the adjustable grill connection (section III in FIG. 4);
FIG. 6 is a schematic view of a small grid plate;
FIG. 7 is a schematic view of a large grid plate;
FIG. 8 is a schematic view of a grid plate connection;
FIG. 9 is a schematic view of the control mechanism (section II in FIG. 1);
1, an SCR body; 2. a front flow guide plate for ammonia injection; 3. an ammonia injection device; 4. a guide plate after ammonia spraying; 5. an upper layer of rectifying grids; 6. a lower layer rectification grid; 7. a small grid plate; 8. lifting lugs of the small grid plate; 9. a small grid plate connecting pin; 10. a large grid plate; 11. a big grid plate lifting lug; 12. a control lever; 13. a grid connecting rod; 14. a fixing hole; 15. a rotating groove; 16. a grid fixing groove; 17. a large grid plate connecting pin; 18. fixing the traveling frame; 19. fixing grooves; 20. a dial scale; 21. a fixed mount; 22. a rotating shaft; 23. a hinge; 24. a catalyst.
Detailed Description
The following describes the substance of the present invention with reference to the accompanying drawings.
As shown in fig. 1 to 4, an adjustable grill system applied to an SCR denitration system includes a plurality of adjustable grill units arranged in an SCR body 1 in a plurality of rows in parallel in a width direction of a flue and in a plurality of columns in a depth direction of the flue.
Each adjustable grid unit comprises a plurality of grid plates, a group of parallel fixed line frames 18 with two ends fixed in the SCR body 1, grid connecting rods 13 for connecting the grid plates and control rods 12 for pushing and pulling the grid connecting rods 13, wherein the grid plates are arranged in parallel along the depth direction of the flue. One end of the grille link 13 extends out of the SCR body 1 and is connected to one end of the control rod 12 by a hinge 23 (shown in FIG. 9). The SCR body 1 is provided with a fixing frame 21 (as shown in fig. 9), the middle of the control rod 12 is connected to the fixing frame 21 through a rotating shaft 22 (as shown in fig. 9), the fixing frame 21 is provided with a dial 20 (as shown in fig. 9) for indicating the rotating angle of the control rod 12, the adjusting range of the control rod is minus 60 degrees to minus 60 degrees, and the adjusting precision is 10 degrees. The plurality of grating plates in each adjustable grating unit are divided into two types, namely a large grating plate 10 and a small grating plate 7 with different heights, the small grating plate 7 is positioned at the outer side, and the large grating plate 10 is positioned in the middle of the small grating plate 7. The matching use and arrangement mode of the large grid plate and the small grid plate can ensure that the flow guide effect of the grid plate can reach the optimum. The middle positions of the two sides of the large grid plate and the small grid plate are respectively provided with a large grid plate lifting lug 11 and a small grid plate lifting lug 8, a grid fixing groove 16 (shown in figure 5) matched with the lifting lugs is arranged on the fixed travelling frame 18, and the grid plates are rotatably connected to the fixed travelling frame 18 through the lifting lugs on the two sides. The bottom of the small grid plate 7 is provided with a small grid plate connecting pin 9 (shown in figure 6), the lower part of the large grid plate is provided with a large grid plate connecting pin 17 (shown in figure 7) at a position 1/4 away from the bottom, the grid connecting rod 13 is provided with a pin hole matched with the connecting pin, and each grid plate is connected to the grid connecting rod 13 through the connecting pin. The control rod 12 drives the grating connecting rod 13 to move back and forth, and the grating connecting rod 13 drives the grating plates to synchronously rotate by taking the lifting lugs as shafts to adjust the angle when moving back and forth.
the size of the small grid plate is 500mm multiplied by 10mm, the size of the large grid plate is 500mm multiplied by 1000mm multiplied by 10m, the distance between the adjacent adjustable grid units in the width direction of the flue is 200mm ~ 300mm, the distance between the two adjustable grid units at the head and the tail and the inner wall of the SCR body is 200mm ~ 300mm, and the distance between the two adjustable grid units in the depth direction of the flue is 500 mm.
the adjustable grid system drives the grid connecting rod to move back and forth through the control rod, the grid connecting rod drives the large grid plate and the small grid plate to rotate by taking the lifting lug as a shaft when moving back and forth, the included angle between the grid plate and the vertical section of the flue is adjusted, the resistance of the local area of the flue is changed, and the flue gas velocity field is changed; on the other hand, the flow direction of partial flue gas is changed by utilizing the flow guiding effect of the grating plates, so that the flue gas amount and the flue gas concentration in the region are changed along with the flow direction, the aim of adjusting a flue gas velocity field and a flue gas concentration field is fulfilled, and the problems of uneven distribution of NOx at a denitration outlet and high ammonia escape rate are solved. In addition, each group of adjustable grating units can be independently controlled, and due to the fact that the number of the arranged grating groups is large, the effective control area of each group of adjustable grating units is small, the influence on the surrounding area is small during adjustment, and the accuracy of adjustment is guaranteed.
The purpose of the above-described embodiments is to specifically describe the material of the present invention, but those skilled in the art should understand that the protection scope of the present invention should not be limited to the specific embodiments.
Claims (10)
1. an adjustable grid system for application in an SCR denitration system, comprising a plurality of adjustable grid elements arranged in an SCR body, characterized in that: the plurality of adjustable grid units are arranged in a plurality of rows in parallel along the width direction of the flue, and are arranged in two rows in parallel along the depth direction of the flue; each adjustable grid unit comprises a plurality of grid plates, a group of parallel fixed line frames, grid connecting rods and control rods, wherein the two ends of each fixed line frame are fixed in the SCR body, the grid connecting rods are connected with the grid plates, the grid connecting rods are connected with the push-pull grid connecting rods, the grid plates are arranged in parallel along the depth direction of a flue and are connected to the fixed line frames in a rotating mode through lifting lugs on the two sides, the lower portions of the grid plates are connected to the grid connecting rods in a rotating mode, one ends of the grid connecting rods extend out of the SCR body and are connected with one ends of the control rods in a rotating mode, the middle portions of the control rods are connected to the SCR body in.
2. The adjustable grid system of claim 1, wherein: the lifting lugs are arranged in the middle of two sides of the grid plate, and grid fixing grooves matched with the lifting lugs are formed in the fixed travelling frame.
3. The adjustable grid system of claim 1, wherein: and a fixing frame is arranged on the SCR body, and the middle part of the control rod is rotatably connected to the fixing frame.
4. the adjustable grid system of claim 3, wherein: and the fixed frame is provided with a dial used for indicating the rotation angle of the control rod.
5. The adjustable grid system of claim 1, wherein: one end of the grid connecting rod extends out of the SCR body and is hinged with one end of the control rod.
6. The adjustable grid system of claim 1, wherein: a plurality of grid plates in each adjustable grid unit are divided into two kinds of grid plates with different heights, the small grid plate is positioned on the outer side, and the large grid plate is positioned in the middle of the small grid plate.
7. the adjustable grid system of claim 6, wherein: the bottom of the small grid plate is provided with a connecting pin, the lower part of the large grid plate is provided with a connecting pin 1/4 away from the bottom, and the grid connecting rod is provided with a pin hole matched with the connecting pin.
8. The adjustable grid system of claim 6, wherein: the dimensions of the small grid plates are 500mm × 500mm × 10mm, and the dimensions of the large grid plates are 500mm × 1000mm × 10 m.
9. the adjustable grid system according to claim 1, wherein the distance between two adjacent adjustable grid units in the width direction of the flue is 200mm ~ 300mm, and the distance between two rows of adjustable grid units from head to tail and the inner wall of the SCR body is 200mm ~ 300 mm.
10. The adjustable grid system of claim 1, wherein: the distance between the two adjustable grid units in the depth direction of the flue is 500 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920429716.1U CN209771835U (en) | 2019-04-01 | 2019-04-01 | Adjustable grid system applied to SCR denitration system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920429716.1U CN209771835U (en) | 2019-04-01 | 2019-04-01 | Adjustable grid system applied to SCR denitration system |
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| Publication Number | Publication Date |
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| CN209771835U true CN209771835U (en) | 2019-12-13 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201920429716.1U Active CN209771835U (en) | 2019-04-01 | 2019-04-01 | Adjustable grid system applied to SCR denitration system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114849438A (en) * | 2022-03-16 | 2022-08-05 | 冀东水泥璧山有限责任公司 | Clinker workshop deNOx systems |
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2019
- 2019-04-01 CN CN201920429716.1U patent/CN209771835U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114849438A (en) * | 2022-03-16 | 2022-08-05 | 冀东水泥璧山有限责任公司 | Clinker workshop deNOx systems |
| CN114849438B (en) * | 2022-03-16 | 2024-04-02 | 冀东水泥璧山有限责任公司 | Clinker workshop denitration system |
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Address after: 210033 fairyland Road, Qixia District, Nanjing, Jiangsu Province, No. 10 Patentee after: Guoneng Nanjing Electric Power Test Research Co.,Ltd. Address before: 210033 fairyland Road, Qixia District, Nanjing, Jiangsu Province, No. 10 Patentee before: GUODIAN NANJING ELECTRIC POWER TEST RESEARCH Co.,Ltd. |