CN215916980U - SCR denitrification facility - Google Patents
SCR denitrification facility Download PDFInfo
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- CN215916980U CN215916980U CN202120417154.6U CN202120417154U CN215916980U CN 215916980 U CN215916980 U CN 215916980U CN 202120417154 U CN202120417154 U CN 202120417154U CN 215916980 U CN215916980 U CN 215916980U
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Abstract
The utility model discloses an SCR (selective catalytic reduction) denitration device, which comprises an SCR reactor, an air inlet flue and an air outlet flue, wherein the air inlet flue is positioned at one side of the SCR reactor and is connected with an inlet at the top of the SCR reactor through an air inlet elbow; the air inlet flue is arranged along the vertical direction, is provided with a flue gas inlet facing downwards vertically, and is internally provided with an inlet expansion joint arranged along the vertical direction; the air outlet flue is arranged along the vertical direction, is provided with a flue gas outlet facing downwards vertically, and is internally provided with an outlet expansion joint arranged along the vertical direction; the projections of the air inlet flue and the air outlet flue on the horizontal plane are both positioned on the inner side of the projection of the outer contour of the steel frame on the horizontal plane. When the expansion joint operates, the pipeline force caused by negative pressure of the expansion joint is downward along the vertical direction, and the force application point is positioned in the outer contour of the steel frame, so that the horizontal pipeline force and the bending moment can not be generated, and the structural strength and the stability of the support steel frame are improved.
Description
Technical Field
The utility model relates to the technical field of flue gas denitration, in particular to an SCR (selective catalytic reduction) denitration device.
Background
Among the denitration device of current SCR (Selective Catalytic Reduction), a denitration inlet flue for letting in flue gas to SCR reactor top entry comprises horizontal air inlet pipe section and the vertical ascending air inlet pipe section that admits air, set up the expansion joint in the horizontal air inlet pipe section, however, because the negative pressure effect when operation, the expansion joint can produce horizontal pipeline power and negative pressure moment of flexure at the horizontal air inlet pipe section relative reactor, and then influences SCR denitrification device's support steelframe structural strength and stability, lead to the steelframe type selection can be very big, the basic design will strengthen, corresponding cost increases. In addition, the expansion joint is arranged on the horizontal air inlet pipe section, so that the occupied area of the denitration air inlet flue is increased, and the SCR denitration device is not compact in structure.
Secondly, denitration air inlet flue and SCR reactor arrange alone and the interval between the two is great, need keep warm alone, have increased heat preservation cost and work load.
SUMMERY OF THE UTILITY MODEL
In view of this, the present invention discloses an SCR denitration device to improve the structural strength and stability of a support steel frame and reduce the cost.
In order to achieve the purpose, the utility model discloses the following technical scheme:
an SCR denitration device comprises an SCR reactor, an air inlet flue and an air outlet flue, wherein the air inlet flue is positioned on one side of the SCR reactor and is connected with an inlet at the top of the SCR reactor through an air inlet elbow, the air outlet flue is connected with an outlet at the bottom of the SCR reactor, and the SCR reactor and the air inlet flue are both supported by a steel frame;
the air inlet flue is arranged along the vertical direction and is provided with a flue gas inlet facing downwards vertically, and an inlet expansion joint arranged along the vertical direction is arranged in the air inlet flue;
the air outlet flue is arranged along the vertical direction and is provided with a flue gas outlet facing downwards vertically, and an outlet expansion joint arranged along the vertical direction is arranged in the air outlet flue;
the projections of the air inlet flue and the air outlet flue on the horizontal plane are both positioned on the inner side of the projection of the outer contour of the steel frame on the horizontal plane.
Preferably, in the SCR denitration device, the air intake flue includes a bottom inlet straight section, a bottom inlet diameter-changing section, a middle inlet straight section, and an upper inlet elbow, which are connected in sequence from bottom to top, and the upper inlet elbow is connected to a top inlet of the SCR reactor;
wherein the inlet expansion joint is arranged on the bottom inlet straight section, and an ammonia spraying grid is arranged in the middle inlet straight section;
the bottom inlet reducer section is gradually reduced from bottom to top, the bottom inlet straight section and the middle inlet straight section are equal-diameter sections, the bottom inlet straight section is flush with the large-diameter end of the bottom inlet reducer section, the middle inlet straight section is flush with the small-diameter end of the bottom inlet reducer section, and the side walls of the bottom inlet straight section, the bottom inlet reducer section, the middle inlet straight section and the upper inlet elbow, which are far away from one side of the SCR reactor, are flush in the vertical direction;
and a first flow guide device is arranged in the upper inlet elbow.
Preferably, in the SCR denitration device, the exhaust flue includes:
the outlet reducer section is connected with an outlet at the bottom of the SCR reactor and is gradually reduced from top to bottom;
the outlet expansion joint is arranged on the bottom outlet straight section;
and the side walls of the bottom outlet straight section and the outlet reducing section, which are far away from one side of the air inlet flue, are flush in the vertical direction.
Preferably, the SCR denitration device further includes a sealing structure for sealing a gap between the SCR reactor and the intake flue, the sealing structure including:
the two vertical sealing plates are respectively connected with the SCR reactor and two pairs of vertical edges of the opposite side walls of the air inlet flue in a sealing manner;
and the bottom ends of the SCR reactor and the opposite side walls of the air inlet flue and the bottom ends of the two vertical sealing plates are hermetically connected to form a horizontal sealing plate of a closed space.
Preferably, in the SCR denitration device, the SCR reactor includes:
the device comprises a middle reaction section provided with a denitration reaction cavity, wherein a catalyst is arranged in the denitration reaction cavity;
the support bottom beam is supported at the bottom end of the middle reaction section, the support bottom beam is arranged on the steel frame, and the air outlet flue is connected with the lower end of the support bottom beam;
the top inlet section is arranged above the middle reaction section, one side of the top inlet section is provided with a top inlet connected with the air inlet flue, and the top inlet is provided with a second flow guide device;
the flow equalizing grid supporting device is connected between the bottom end of the top inlet section and the top end of the middle reaction section;
a flow equalization grid disposed on the flow equalization grid support.
Preferably, in the SCR denitration device, the middle reaction section includes:
the catalyst support device comprises at least one layer of catalyst support device, wherein the support bottom beam, the catalyst support device and the flow equalizing grid support device are sequentially arranged from bottom to top, and a layer of catalyst is respectively arranged on the support bottom beam and the catalyst support device;
the multilayer wallboard is hermetically connected with the support bottom beam, the catalyst supporting device and the flow equalizing grid supporting device, and the support bottom beam, the catalyst supporting device, the flow equalizing grid supporting device and the wallboard are matched to enclose the denitration reaction cavity;
the wall board is provided with a catalyst loading door and a soot blower, and the wall board and the top inlet section are both provided with an access manhole door.
Preferably, in the SCR denitration device, the support bottom beam, the catalyst support device, and the flow equalizing grid support device have the same structure, and each of the support bottom beam, the catalyst support device, and the flow equalizing grid support device includes:
a plurality of long main beams arranged in parallel, the long main beams being arranged along a width direction of the SCR reactor, the SCR reactor and the air intake flue being arranged along the width direction;
the short main beams are perpendicular to the long main beams, all the short main beams positioned at the same side end of the long main beams are arranged in a collinear way, and two ends of the long main beams extend out of the short main beams;
a plurality of secondary beams are sequentially connected with the middle parts of two adjacent long main beams, are parallel to the short main beams and are arranged in a plurality of straight lines;
the wall plate is provided with a plurality of vertical main ribs which are arranged along the vertical direction, the upper ends of the vertical main ribs are respectively connected with the long main beams on the upper layer of the wall plate in a one-to-one correspondence manner, and the lower ends of the vertical main ribs are respectively connected with the long main beams on the lower layer of the wall plate in a one-to-one correspondence manner;
a bottom connecting plate is connected between the top surface of the external extending end of the long main beam of the supporting bottom beam and the vertical main rib connected with the top surface; the side surface of the extending end of the outer part of the long main beam of the supporting bottom beam is welded with a reinforcing attachment plate, and the bottom surface of the supporting bottom beam is welded with a reinforcing bottom plate.
Preferably, in the SCR denitration device, the long main beam and the short main beam are both box beams, and the height of each box beam is greater than the width of each box beam.
Preferably, in the SCR denitration device, the support bottom beam and the middle inlet straight section of the air intake flue are fixedly connected to the steel frame through a limit support;
spacing support includes:
the first Z-direction limiting supports are used for pressing the supporting bottom beam downwards on the top surface of the steel frame along the vertical direction, and the first Z-direction limiting supports are in positioning fit with the reinforcing bottom plate at the end part of the long main beam of the supporting bottom beam along the vertical direction;
the second Z-direction limiting supports are used for pressing the air inlet flue downwards on the top surface of the steel frame along the vertical direction, and are in positioning fit with the outer flange of the air inlet flue along the vertical direction;
the X-direction limiting support is used for fixing the supporting bottom beam and the steel frame along the width direction of the SCR reactor, and the X-direction limiting support is in positioning fit with a protruding beam arranged on the lateral surface of the long main beam outside the supporting bottom beam along the width direction;
the support bottom beam and the at least two first Y-direction limiting supports of the steel frame are fixed along the length direction of the SCR reactor, and the first Y-direction limiting supports are positioned on two sides of the support bottom beam and are respectively in positioning fit with the end part of the long main beam of the support bottom beam along the length direction;
and the second Y-direction limiting support is fixed on the air inlet flue and the steel frame along the length direction of the SCR reactor, is positioned on one side of the air inlet flue, which is far away from the supporting bottom beam, and is in positioning fit with the outer flange of the air inlet flue along the length direction.
Preferably, in the SCR denitration device, a top plate of the top inlet section is inclined downward from one end of the top inlet to the other end; a top supporting device is also connected between the top plate and the flow equalizing grid supporting device;
the top support device comprises a long main beam supported in the flow equalizing grid support device along the vertical direction and a plurality of support stand columns between the top plates, and the support stand columns are uniformly distributed on the long main beam of the flow equalizing grid support device.
According to the technical scheme, the SCR denitration device comprises an SCR reactor, an air inlet flue and an air outlet flue, wherein the air inlet flue is positioned on one side of the SCR reactor and is connected with an inlet at the top of the SCR reactor through an air inlet elbow; the air inlet flue is arranged along the vertical direction and is provided with a flue gas inlet facing downwards vertically, and an inlet expansion joint arranged along the vertical direction is arranged in the air inlet flue; the air outlet flue is arranged along the vertical direction and is provided with a flue gas outlet facing downwards vertically, and an outlet expansion joint arranged along the vertical direction is arranged in the air outlet flue; wherein, the projections of the air inlet flue and the air outlet flue on the horizontal plane are both positioned at the inner side of the projection of the outer contour of the steel frame on the horizontal plane.
According to the utility model, the inlet expansion joint is arranged on the air inlet flue arranged along the vertical direction, the outlet expansion joint is arranged on the air outlet flue arranged along the vertical direction, and the projections of the air inlet flue and the air outlet flue on the horizontal plane are both positioned on the inner side of the projection of the outer contour of the steel frame on the horizontal plane, so that when the SCR denitration device operates, the pipeline force of the expansion joint caused by negative pressure is downward along the vertical direction, and the force application point is positioned in the outer contour of the steel frame, the horizontal pipeline force and the bending moment caused by the negative pressure cannot be generated, thus the stability and the safety of the steel frame structure are better facilitated, the structural strength and the stability of the support steel frame are improved, and the model selection and the reinforcement cost of the steel frame are further reduced; meanwhile, the air inlet flue and the air outlet flue do not need to occupy horizontal space except a steel frame, so that the occupied area is reduced, and the structural compactness of the SCR denitration device is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a front view of an SCR denitration device according to an embodiment of the present invention;
FIG. 2 is a cross-sectional view taken along line A-A of FIG. 1;
FIG. 3 is a cross-sectional view taken along line B-B of FIG. 1;
FIG. 4 is a top view of a support base beam according to the disclosed embodiments;
FIG. 5 is a partial enlarged structural view of M in FIG. 4;
FIG. 6 is a cross-sectional view taken along line C-C of FIG. 4;
FIG. 7 is a top view of a catalyst support and flow equalization grid support as disclosed in an embodiment of the present invention;
fig. 8 is a sectional view taken along line D-D in fig. 7.
Wherein, in the above fig. 1-8:
1. a bottom inlet straight section; 2. an inlet expansion joint; 3. a bottom inlet reducer section; 4. a middle inlet straight section; 5. a horizontal closing plate; 6. an ammonia injection grid; 7. a vertical closing plate; 8. an upper inlet elbow; 9. a first flow guide device; 10. a second flow guide device; 11. a top support means; 12. a top inlet section; 13. a flow equalizing grid; 14. a flow equalizing grid support; 15. a third layer of wallboard; 16. a third layer of catalyst support means; 17. a second layer of wallboard; 18. a second layer of catalyst support means; 19. a first layer of wallboard; 20. A bottom connecting plate; 21. supporting the bottom beam; 22. a steel frame; 23. an outlet reducer section; 24. a bottom outlet straight section; 25. an outlet expansion joint; 26. a first Z-direction limiting support; 27. an X-direction limiting support; 28. a second Z-direction limiting support; 29. a first Y-direction limiting support; 30. a second Y-direction limiting support; 31. a soot blower; 32. a catalyst loading door; 33. a manhole door is overhauled;
a. a long main beam; b. a short main beam; c. a secondary beam; d. erecting main ribs; 211. reinforcing the flitch; 212. the bottom plate is reinforced.
Detailed Description
The embodiment of the utility model discloses an SCR denitration device, which improves the structural strength and stability of a supporting steel frame and reduces the cost.
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, an SCR denitration device disclosed in the embodiment of the present invention includes an SCR reactor, an air inlet flue and an air outlet flue, the air inlet flue is located at one side of the SCR reactor and connected to an inlet at the top of the SCR reactor through an air inlet elbow, the air outlet flue is connected to an outlet at the bottom of the SCR reactor, and the SCR reactor and the air inlet flue are both supported by a steel frame 22; the air inlet flue is arranged along the vertical direction and is provided with a flue gas inlet facing downwards vertically, and an inlet expansion joint 2 arranged along the vertical direction is arranged in the air inlet flue; the air outlet flue is arranged along the vertical direction and is provided with a flue gas outlet facing downwards vertically, and an outlet expansion joint 25 arranged along the vertical direction is arranged in the air outlet flue; wherein, the projections of the air inlet flue and the air outlet flue on the horizontal plane are both positioned at the inner side of the projection of the outer contour of the steel frame 22 on the horizontal plane.
When in operation, the flue gas firstly enters the air inlet flue to spray ammonia, then enters the SCR reactor, and NO in the flue gas is sprayed by the catalystxConversion to N2And H2And O, performing denitration.
According to the utility model, the inlet expansion joint 2 is arranged on the air inlet flue arranged along the vertical direction, the outlet expansion joint 25 is arranged on the air outlet flue arranged along the vertical direction, and the projections of the air inlet flue and the air outlet flue on the horizontal plane are both positioned on the inner side of the projection of the outer contour of the steel frame 22 on the horizontal plane, so that when the SCR denitration device operates, the pipeline force caused by negative pressure of the expansion joint is downward along the vertical direction, and the force application point is positioned in the outer contour of the steel frame 22, and the horizontal pipeline force and the bending moment caused by the negative pressure cannot be generated, so that the stability and the safety of the structure of the steel frame 22 are better facilitated, the structural strength and the stability of the support steel frame 22 are improved, and further the model selection and the strengthening cost of the steel frame 22 are reduced; meanwhile, the air inlet flue and the air outlet flue do not need to occupy horizontal space outside the steel frame 22, so that the occupied area is reduced, and the structural compactness of the SCR denitration device is improved.
Specifically, the air inlet flue comprises a bottom inlet straight section 1, a bottom inlet reducing section 3, a middle inlet straight section 4 and an upper inlet elbow 8 which are sequentially connected from bottom to top, wherein the upper inlet elbow 8 is connected with a top inlet of the SCR reactor; wherein, the inlet expansion joint 2 is arranged at the bottom inlet straight section 1, and the middle inlet straight section 4 is internally provided with an ammonia spraying grid 6; bottom import reducing section 3 convergent from bottom to top, bottom import straight section 1 and middle part import straight section 4 are the constant diameter section, bottom import straight section 1 and bottom import reducing section 3's big footpath end parallel and level, middle part import straight section 4 and bottom import reducing section 3's path end parallel and level, and bottom import straight section 1, bottom import reducing section 3, middle part import straight section 4 and upper portion import elbow 8 keep away from the equal parallel and level of lateral wall on one side of the SCR reactor in vertical direction.
In the process that the flue gas rises along the vertical direction, the flue gas firstly enters the bottom inlet straight section 1 with a larger diameter, so that the flue gas can conveniently enter; then enters the bottom inlet reducer section 3 to improve the flow speed of the flue gas; then enters the middle inlet straight section 4, sprays ammonia to the flue gas by the ammonia spraying grid 6, and finally is sent to the top inlet of the SCR reactor through the first flow guiding device 9 of the upper inlet elbow 8, so as to ensure the uniformity of the flue gas flow.
The middle inlet straight section 4 of the air inlet flue is connected with the top inlet of the SCR reactor through the upper inlet elbow 8, so that the distance between the air inlet flue and the SCR reactor is reduced, the air inlet flue can be controlled to be about 1 meter, the structure is more compact, and the occupied area is smaller.
The air outlet flue comprises an outlet reducer section 23 connected with an outlet at the bottom of the SCR reactor, and the outlet reducer section 23 is gradually reduced from top to bottom; a bottom outlet straight section 24 connected with the lower end of the outlet reducer section 23, and an outlet expansion joint 25 arranged on the bottom outlet straight section 24; wherein, the side walls of the bottom outlet straight section 24 and the outlet reducing section 23 far away from the side of the air inlet flue are level in the vertical direction. The denitrated flue gas flows to the outlet reducer section 23 from the bottom outlet of the SCR reactor, the flow speed of the flue gas is improved, and then the denitrated flue gas is discharged from the bottom outlet straight section 24.
The lateral wall that the flue that admits air and the flue that gives vent to anger that this embodiment is located the outside is located same vertical plane respectively, and whole SCR denitrification facility's external profile shape is regular, has improved structure compactness, has still guaranteed the structure steadiness.
Import expansion joint 2 sets up at bottom import straight section 1, and export expansion joint 25 sets up at bottom export straight section 24, and the effort fulcrum that the expansion joint produced is closer apart from SCR denitrification facility's installation base face, has further guaranteed the stability of supporting steelframe 22.
It will be appreciated that the inlet and outlet flues may also take other cross-sectional forms, provided that they are arranged in a vertical direction.
As shown in fig. 1, the SCR denitration device further includes a sealing structure for sealing a gap between the SCR reactor and the air intake flue, and the sealing structure includes two vertical sealing plates 7 for respectively sealing and connecting two pairs of vertical edges of the SCR reactor and the opposite side walls of the air intake flue; and the bottom ends of the opposite side walls of the SCR reactor and the air inlet flue and the bottom ends of the two vertical sealing plates 7 are hermetically connected to form a horizontal sealing plate 5 of a closed space.
The inlet flue and the reactor are in sealing connection through the vertical sealing plates 7 on the two sides, the bottoms of the vertical sealing plates 7 on the two sides are sealed through the horizontal sealing plates 5, the vertical sealing plates 7 on the two sides and the horizontal sealing plates 5 form a sealed space, so that the sealed space does not exchange heat with outside air when the denitration device operates, only the heat of the outer walls of the SCR reactor and the air inlet flue, which are positioned outside the sealed space, needs to be preserved, the heat of the outer walls on the same side of the SCR reactor and the air inlet flue can be preserved together, and the heat preservation cost and the workload are greatly reduced; in addition, vertical shrouding 7 and horizontal shrouding 5 make denitration SCR reactor and the upper portion of the flue that admits air connect to be an overall structure, and lower part flue has the clearance, forms n type structure, bears the structure load jointly, and is whole more stable safety.
In a specific embodiment, the SCR reactor comprises a middle reaction section provided with a denitration reaction cavity, and a catalyst is arranged in the denitration reaction cavity; the support bottom beam 21 is supported at the bottom end of the middle reaction section, the support bottom beam 21 is arranged on the steel frame 22, and the air outlet flue is connected with the lower end of the support bottom beam 21; the top inlet section 12 is arranged above the middle reaction section, one side of the top inlet section 12 is provided with a top inlet connected with the air inlet flue, and the top inlet is provided with a second flow guide device 10; a flow equalizing grid support device 14 connected between the bottom end of the top inlet section 12 and the top end of the middle reaction section; a flow equalizing grid 13 arranged on a flow equalizing grid support 14.
Flue gas is by the leading-in top entry section 12 of the second guiding device 10 of top entry, flows through the denitration reaction chamber that flows through flow equalizing grid 13 entering middle part reaction section, can improve the homogeneity of air current, utilizes the catalyst to carry out the denitration in denitration reaction chamber, discharges by the flue of giving vent to anger at last.
The SCR reactor is simple in structure, is fixed on the steel frame 22 through the supporting bottom beam 21, is convenient to assemble, and improves structural strength.
In a further technical scheme, the middle reaction section comprises at least one layer of catalyst supporting device, a supporting bottom beam 21, the catalyst supporting device and a flow equalizing grid supporting device 14 are sequentially arranged from bottom to top, and a layer of catalyst is respectively arranged on the supporting bottom beam 21 and the catalyst supporting device; the multilayer wallboard is hermetically connected with the support bottom beam 21, the catalyst support device and the flow equalizing grid support device 14, and the support bottom beam 21, the catalyst support device, the flow equalizing grid support device 14 and the wallboard are matched to form a denitration reaction cavity; wherein the wall panels are provided with catalyst loading doors 32 and sootblowers 31, and the wall panels and the top entry section 12 are provided with manhole doors 33.
In a specific embodiment, two catalyst supporting devices are used as the second layer catalyst supporting device 18 and the third layer catalyst supporting device 16 respectively, the supporting bottom beam 21 is used as the support of the whole reactor, and is also used as the first layer catalyst supporting device, a layer of catalyst is arranged on the supporting bottom beam 21, the second layer catalyst supporting device 18 and the third layer catalyst supporting device 16 respectively, at this time, the supporting bottom beam 21, the second layer catalyst supporting device 18, the third layer catalyst supporting device 16 and the flow equalizing grid supporting device 14 are arranged from bottom to top in sequence, and three layers of catalyst are used for denitration of flue gas, and certainly, one or other number of the catalyst supporting devices can also be adopted.
Correspondingly, the wall plates are three layers, and are respectively a first layer of wall plate 19 which is used for sealing and connecting the supporting bottom beam 21 and the second layer of catalyst supporting device 18 from bottom to top; a second layer of panels 17 sealingly connecting the second layer of catalyst support means 18 to the third layer of catalyst support means 16; a third layer of wall panels 15 which hermetically connect the third layer of catalyst support means 16 with the flow equalization grid support means 14; the denitration reaction cavity is formed by matching a support bottom beam 21, a first layer of wall plate 19, a second layer of catalyst supporting device 18, a second layer of wall plate 17, a third layer of catalyst supporting device 16, a third layer of wall plate 15 and a flow equalizing grid supporting device 14.
The first, second and third wall panels 19, 17, 15 are each provided with a catalyst loading door 32, an access manhole door 33 and a sootblower 31, and the access manhole door 33 is provided at the top entry section 12. The catalyst loading door 32 is used for installing and replacing the catalyst, the inspection manhole door 33 is used for inspecting and repairing the surface of the catalyst and the flow equalizing grating 13, and the soot blower 31 is used for blowing away floating soot on the surface of the catalyst.
In the embodiment, the interlayer spacing of the catalyst is controlled to be 3-3.2 m, the height of the supporting bottom beam 21, the height of the catalyst supporting device and the height of the flow equalizing grid supporting device 14 are controlled to be at least 0.2 m, and the height of the wallboard can be controlled to be below 2.8 m, so that the whole large piece of goods can be delivered after all sides of the wallboard are welded in a workshop; the flow equalizing grid 13 is also delivered integrally in units, and can be directly hoisted on site, so that assembly type installation can be realized, and the on-site assembling and welding workload is greatly reduced.
In order to further simplify the structure, as shown in fig. 4-8, the supporting bottom beams 21, the catalyst supporting device and the flow equalizing grid supporting device 14 have the same structure, and each of them includes a plurality of long main beams a arranged in parallel, the long main beams a are arranged along the width direction of the SCR reactor, and the SCR reactor and the air intake flue are arranged along the width direction; the short main beams b are sequentially connected with the corresponding end parts of the two adjacent long main beams a, are perpendicular to the long main beams a, are arranged in a collinear manner at the same side end part of the long main beams a, and extend out of the short main beams b from the two ends of the long main beams a; and a plurality of secondary beams c in the middle of the two adjacent long main beams a are sequentially connected, and the secondary beams c are parallel to the short main beams b and are arranged in a plurality of straight lines. In this embodiment, the supporting bottom beam 21, the catalyst supporting device, and the flow equalizing grid supporting device 14 are all composed of a long main beam a, a short main beam b, and a secondary beam c, which can be processed in batches, and are convenient to process and install.
Correspondingly, a plurality of vertical main ribs d arranged along the vertical direction are arranged on the wall board, the upper ends of the vertical main ribs d are respectively connected with the long main beams a on the upper layer of the wall board in a one-to-one correspondence manner, and the lower ends of the vertical main ribs d are respectively connected with the long main beams a on the lower layer of the wall board in a one-to-one correspondence manner; the top surface and the bottom surface of the wall plate are respectively welded with the peripheral surfaces of the corresponding supporting devices, and the protruding parts of the end parts of the main beams are welded with the long main beams a through the main ribs, so that the connecting strength of the wall body and the supporting devices is improved.
As shown in fig. 3, the upper ends of the vertical main ribs d of the third layer of wall plate 15 are connected with the long main beams a of the flow equalizing grid support device 14 in a one-to-one correspondence manner, and the lower ends of the vertical main ribs d are connected with the long main beams a of the third layer of catalyst support device 16 in a one-to-one correspondence manner;
similarly, the upper ends of the vertical main ribs d of the second layer of wall plate 17 are correspondingly connected with the long main beams a of the third layer of catalyst supporting device 16, and the lower ends of the vertical main ribs d are correspondingly connected with the long main beams a of the second layer of catalyst supporting device 18;
similarly, the upper ends of the vertical main ribs d of the first layer of wall plate 19 are connected with the long main beams a of the second layer of catalyst supporting device 18 in a one-to-one correspondence manner, and the lower ends of the vertical main ribs d are connected with the long main beams a of the supporting bottom beams 21 in a one-to-one correspondence manner.
Further, as shown in fig. 1, a bottom connecting plate 20 is connected between the top surface of the external extending end of the long main beam a of the supporting bottom beam 21 and the vertical main rib d connected with the top surface, one side of the bottom connecting plate 20 is connected with the vertical main rib d of the first layer wall plate 19, and the other side is connected with the long main beam a of the supporting bottom beam 21.
As shown in fig. 5 to 6, a reinforcing attachment plate 211 is welded to the side surface of the outer extended end of the long main beam a of the support bottom beam 21, and a reinforcing bottom plate 212 is welded to the bottom surface thereof, so as to ensure the safety of the whole structure.
The long main beam a and the short main beam b are both box-shaped beams, and the height of the box-shaped beams is larger than the width of the box-shaped beams. Therefore, the long main beam a and the short main beam b of the supporting bottom beam 21, the flow equalizing grid supporting device 14 and the catalyst supporting device are narrow and high box-shaped beams, so that ash is not easy to accumulate in the denitration reactor, an ash accumulation preventing plate is not needed, and the secondary beam c is simple to mount and butt-joint with the long main beam a and the short main beam b; the secondary beam c is preferably made of a pipe material, and can also be made of conventional H-shaped steel or other section steel.
In order to facilitate assembly, the support bottom beam 21 and the middle inlet straight section 4 of the air inlet flue are fixedly connected with a steel frame 22 through a limiting support; as shown in fig. 1-3, the limiting support comprises a plurality of first Z-direction limiting supports 26 for pressing the supporting bottom beam 21 downwards on the top surface of the steel frame 22 along the vertical direction, and the first Z-direction limiting supports 26 are in positioning fit with a reinforcing bottom plate 212 at the end part of the long main beam a of the supporting bottom beam 21 along the vertical direction; a plurality of second Z-direction limiting supports 28 used for pressing the air inlet flue downwards on the top surface of the steel frame 22 along the vertical direction, wherein the second Z-direction limiting supports 28 are in positioning fit with the outer flange of the air inlet flue along the vertical direction; an X-direction limiting support 27 for fixing the supporting bottom beam 21 and the steel frame 22 along the width direction of the SCR reactor, wherein the X-direction limiting support 27 is in positioning fit with a protruding beam arranged on the lateral surface of the long main beam a at the outer side of the supporting bottom beam 21 along the width direction; at least two first Y-direction limiting supports 29 for fixing the supporting bottom beam 21 and the steel frame 22 along the length direction of the SCR reactor, wherein the first Y-direction limiting supports 29 are positioned at two sides of the supporting bottom beam 21 and are respectively positioned and matched with the end part a of the long main beam of the supporting bottom beam 21 along the length direction; and a second Y-direction limiting support 30 for fixing the air inlet flue and the steel frame 22 along the length direction of the SCR reactor, wherein the second Y-direction limiting support 30 is positioned on one side of the air inlet flue, which is far away from the supporting bottom beam 21, and is in positioning fit with an outer flange of the air inlet flue along the length direction.
Specifically, the first Z-direction limiting supports 26 are respectively and uniformly distributed on two sides of the supporting bottom beam 21 in the width direction; the second Z-direction limiting supports 28 are respectively and uniformly distributed on two sides of the flange on the outer side of the inlet straight section 4 in the middle of the air inlet flue, and the second Z-direction limiting support 28 close to one side of the supporting bottom beam 21 is positioned in the middle of the two first Z-direction limiting supports 26, so that the fixing strength of the denitration device relative to the steel frame 22 in the vertical direction is improved;
the two X-direction limiting supports 27 are symmetrically arranged on two sides of the supporting bottom beam 21 in the length direction, and the reactor and the air inlet flue are fixed into a whole through the sealing plates, so that the two supports can simultaneously realize the fixation of the supporting bottom beam 21 and the air inlet flue in the width direction relative to the steel frame 22;
the two first Y-direction limiting supports 29 are symmetrically arranged on two sides of the supporting bottom beam 21 in the width direction; the second Y-direction limiting support 30 is arranged on one side, away from the supporting bottom beam 21, of the middle inlet straight section 4 of the air inlet flue, and the first Y-direction limiting support 29 close to one side of the air inlet flue and the second Y-direction limiting support 30 are symmetrically arranged on two sides of the air inlet flue, so that the supporting bottom beam 21 and the air inlet flue are fixed in the length direction relative to the steel frame 22 respectively.
First Y plays the effect of preventing that whole denitrification facility from toppling to spacing support 29, second Y to spacing support 30 and first Z to spacing support 26, second Z to spacing support 28 cooperation, and first Y plays to spacing support 29, second Y to spacing support 30 and X to spacing support 27 and can form a virtual fixed point, prevents that denitrification facility horizontal direction from removing.
All the limiting supports are placed on the same steel frame 22 with the same height, so that the upward and downward expansion amounts of the air inlet flue and the reactor are consistent.
To facilitate the flow of flue gas to the middle reaction section, the ceiling of the top inlet section 12 slopes downwardly from one end of the top inlet to the other, as shown in fig. 1 and 3.
In order to further improve the structural strength, a top supporting device 11 is connected between the top plate and the flow equalizing grid supporting device 14; the top support means 11 comprises a plurality of support columns supported in the vertical direction between the long main beams a inside the flow equalizing grid support means 14 and the top plate, and the support columns are uniformly distributed on the long main beams a of the flow equalizing grid support means 14.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the utility model. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. An SCR denitration device comprises an SCR reactor, an air inlet flue and an air outlet flue, wherein the air inlet flue is positioned at one side of the SCR reactor and is connected with an inlet at the top of the SCR reactor through an air inlet elbow, the air outlet flue is connected with an outlet at the bottom of the SCR reactor, and the SCR reactor and the air inlet flue are both supported by a steel frame (22); it is characterized in that the preparation method is characterized in that,
the air inlet flue is arranged along the vertical direction and is provided with a flue gas inlet facing downwards vertically, and an inlet expansion joint (2) arranged along the vertical direction is arranged in the air inlet flue;
the air outlet flue is arranged along the vertical direction and is provided with a flue gas outlet facing downwards vertically, and an outlet expansion joint (25) arranged along the vertical direction is arranged in the air outlet flue;
the projections of the air inlet flue and the air outlet flue on the horizontal plane are both positioned on the inner side of the projection of the outer contour of the steel frame (22) on the horizontal plane.
2. The SCR denitration device according to claim 1, wherein the air inlet flue comprises a bottom inlet straight section (1), a bottom inlet reducing section (3), a middle inlet straight section (4) and an upper inlet elbow (8) which are sequentially connected from bottom to top, and the upper inlet elbow (8) is connected with a top inlet of the SCR reactor;
wherein the inlet expansion joint (2) is arranged on the bottom inlet straight section (1), and the middle inlet straight section (4) is internally provided with an ammonia spraying grid (6);
the bottom inlet diameter-changing section (3) is gradually reduced from bottom to top, the bottom inlet straight section (1) and the middle inlet straight section (4) are equal-diameter sections, the bottom inlet straight section (1) is flush with the large-diameter end of the bottom inlet diameter-changing section (3), the middle inlet straight section (4) is flush with the small-diameter end of the bottom inlet diameter-changing section (3), and the bottom inlet straight section (1), the bottom inlet diameter-changing section (3), the middle inlet straight section (4) and the side wall of the upper inlet elbow (8) on the side far away from the SCR reactor are flush in the vertical direction;
and a first flow guide device (9) is arranged in the upper inlet elbow (8).
3. The SCR denitration device of claim 2, wherein the outlet flue comprises:
an outlet reducer section (23) connected to a bottom outlet of the SCR reactor, the outlet reducer section (23) tapering from top to bottom;
a bottom outlet straight section (24) connected with the lower end of the outlet reducer section (23), wherein the outlet expansion joint (25) is arranged on the bottom outlet straight section (24);
wherein the side walls of the bottom outlet straight section (24) and the outlet reducing section (23) on the side far away from the air inlet flue are level in the vertical direction.
4. The SCR denitration device of claim 1, further comprising a closing structure that seals a gap between the SCR reactor and the intake flue, the closing structure comprising:
two vertical sealing plates (7) which are respectively connected with the SCR reactor and two pairs of vertical edges of the opposite side walls of the air inlet flue in a sealing way;
and the horizontal sealing plate (5) is used for sealing and connecting the SCR reactor with the bottom ends of the opposite side walls of the air inlet flue and the bottom ends of the two vertical sealing plates (7) to form a closed space.
5. The SCR denitration device of claim 1, wherein the SCR reactor comprises:
the device comprises a middle reaction section provided with a denitration reaction cavity, wherein a catalyst is arranged in the denitration reaction cavity;
the support bottom beam (21) is supported at the bottom end of the middle reaction section, the support bottom beam (21) is arranged on the steel frame (22), and the air outlet flue is connected with the lower end of the support bottom beam (21);
a top inlet section (12) arranged above the middle reaction section, wherein one side of the top inlet section (12) is provided with a top inlet connected with the air inlet flue, and a second flow guide device (10) is arranged at the top inlet;
a flow equalizing grid support device (14) connected between the bottom end of the top inlet section (12) and the top end of the middle reaction section;
a flow equalizing grid (13) arranged on the flow equalizing grid support (14).
6. The SCR denitration device of claim 5, wherein the middle reaction section comprises:
the catalyst supporting device comprises at least one layer of catalyst supporting device, wherein the supporting bottom beam (21), the catalyst supporting device and the flow equalizing grid supporting device (14) are sequentially arranged from bottom to top, and a layer of catalyst is respectively arranged on the supporting bottom beam (21) and the catalyst supporting device;
the multilayer wallboard is used for hermetically connecting the support bottom beam (21), the catalyst support device and the flow equalizing grid support device (14), and the support bottom beam (21), the catalyst support device, the flow equalizing grid support device (14) and the wallboard are matched to enclose the denitration reaction cavity;
wherein, be provided with catalyst loading door (32) and soot blower (31) on the wallboard, wallboard and top entry section (12) all are provided with access manhole door (33).
7. SCR denitration device according to claim 6, wherein the supporting bottom beams (21), the catalyst support means and the flow equalizing grid support means (14) are structurally identical and each comprise:
a plurality of long main beams (a) arranged in parallel, the long main beams (a) being arranged in a width direction of the SCR reactor, the SCR reactor and the intake flue being arranged in the width direction;
the long main beams (a) are connected with the short main beams (b) at the ends corresponding to the two adjacent long main beams (a) in sequence, the short main beams (b) are perpendicular to the long main beams (a), all the short main beams (b) at the same side end of the long main beams (a) are arranged in a collinear manner, and the two ends of the long main beams (a) extend out of the short main beams (b);
a plurality of secondary beams (c) are sequentially connected with the middle parts of two adjacent long main beams (a), are parallel to the short main beams (b) and are arranged in a plurality of straight lines;
the wall plate is provided with a plurality of vertical main ribs (d) which are arranged along the vertical direction, the upper ends of the vertical main ribs (d) are respectively connected with the long main beams (a) on the upper layer of the wall plate in a one-to-one correspondence manner, and the lower ends of the vertical main ribs (d) are respectively connected with the long main beams (a) on the lower layer of the wall plate in a one-to-one correspondence manner;
a bottom connecting plate (20) is connected between the top surface of the external extending end of the long main beam (a) of the supporting bottom beam (21) and a vertical main rib (d) connected with the top surface; the side surface of the extending end of the long main beam (a) of the support bottom beam (21) is welded with a reinforcing attachment plate (211), and the bottom surface is welded with a reinforcing bottom plate (212).
8. The SCR denitration device according to claim 7, wherein the long main beams (a) and the short main beams (b) are box beams, and the height of the box beams is larger than the width thereof.
9. The SCR denitration device according to claim 7, wherein the support bottom beam (21) and the middle inlet straight section (4) of the air inlet flue are fixedly connected with the steel frame (22) through a limiting support;
spacing support includes:
a plurality of first Z-direction limiting supports (26) used for pressing the supporting bottom beam (21) downwards on the top surface of the steel frame (22) along the vertical direction, wherein the first Z-direction limiting supports (26) are matched with a reinforcing bottom plate (212) at the end part of a long main beam (a) of the supporting bottom beam (21) in a positioning way along the vertical direction;
a plurality of second Z-direction limiting supports (28) used for pressing the air inlet flue downwards on the top surface of the steel frame (22) along the vertical direction, wherein the second Z-direction limiting supports (28) are in positioning fit with the outer flange of the air inlet flue along the vertical direction;
the X-direction limiting support (27) is used for fixing the supporting bottom beam (21) and the steel frame (22) along the width direction of the SCR reactor, and the X-direction limiting support (27) is in positioning fit with a protruding beam arranged on the side surface of the long main beam (a) on the outer side of the supporting bottom beam (21) along the width direction;
at least two first Y-direction limiting supports (29) for fixing the supporting bottom beam (21) and the steel frame (22) along the length direction of the SCR reactor, wherein the first Y-direction limiting supports (29) are positioned at two sides of the supporting bottom beam (21) and are respectively matched with the end part of a long main beam (a) of the supporting bottom beam (21) in a positioning way along the length direction;
and the air inlet flue and a second Y-direction limiting support (30) of the steel frame (22) are fixed along the length direction of the SCR reactor, and the second Y-direction limiting support (30) is positioned on one side, away from the supporting bottom beam (21), of the air inlet flue and is in positioning fit with an outer side flange of the air inlet flue along the length direction.
10. The SCR denitration device of claim 7, wherein a ceiling of the top inlet section (12) is inclined downward from one end to the other end of the top inlet; a top supporting device (11) is connected between the top plate and the flow equalizing grid supporting device (14);
the top support device (11) comprises a plurality of support columns which are supported between a long main beam (a) on the inner side of the flow equalizing grid support device (14) and the top plate along the vertical direction, and the support columns are uniformly distributed on the long main beam (a) of the flow equalizing grid support device (14).
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| CN114950124A (en) * | 2021-02-25 | 2022-08-30 | 福建龙净脱硫脱硝工程有限公司 | SCR denitrification facility |
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