CN217016099U

CN217016099U - Ammonia spraying grid of SCR denitration system

Info

Publication number: CN217016099U
Application number: CN202220766131.0U
Authority: CN
Inventors: 曹英
Original assignee: Hunan Yuanzhuo Environmental Protection Technology Co ltd
Current assignee: Hunan Yuanzhuo Environmental Protection Technology Co ltd
Priority date: 2022-04-02
Filing date: 2022-04-02
Publication date: 2022-07-22
Anticipated expiration: 2032-04-02

Abstract

The utility model relates to the technical field of ammonia injection grids, and discloses an ammonia injection grid of an SCR (selective catalytic reduction) denitration system, which comprises ammonia injection branch pipes, wherein a plurality of groups of ammonia injection branch pipes are mutually vertically staggered to form the ammonia injection grid, a plurality of groups of nozzle pipes are fixedly welded on the ammonia injection grid in an upward vertical direction, the plurality of groups of nozzle pipes are uniformly distributed on the ammonia injection grid, a hood is coaxially arranged on each nozzle pipe, a plurality of groups of spiral blades are installed on the outer wall surface of the hood in a threaded manner, an outer annular groove is formed in the position, close to the upper side, of the outer wall surface of the hood, and an inner annular groove is formed in the position, close to the upper side, of the inner wall surface of the hood. According to the utility model, the groups of helical blades are influenced by the airflow to drive the hood to rotate freely, and the ammonia airflow is dispersed through the multiple groups of helical blades, so that the original vertically upward ammonia airflow becomes diffused to the periphery at a certain angle, and the effect of fully contacting the ammonia gas and the flue gas is achieved.

Description

Ammonia spraying grid of SCR denitration system

Technical Field

The utility model relates to the technical field of ammonia injection gratings, in particular to an ammonia injection grating of an SCR denitration system.

Background

In an SCR system of a large-scale thermal generator set, an Ammonia Injection Grid (AIG) is generally installed, the Ammonia Injection Grid (AIG) is designed to divide the cross section of a flue into a plurality of control areas, and each control area is provided with a plurality of injection holes. The ammonia spraying grid comprises an ammonia spraying pipeline, a support, fittings, an ammonia gas distribution device and the like.

The central part of an Ammonia Injection Grid (AIG) is a nozzle, the traditional nozzle can only inject ammonia gas vertically upwards, the ammonia gas flow vertically upwards contacts with flue gas, so that the contact area of the ammonia gas and the flue gas is limited, the ammonia gas and the flue gas are not beneficial to being mixed, and the upper port of the nozzle is vertically upwards distributed, so that impurities such as soot in the flue gas easily fall into the nozzle to cause the nozzle to be blocked.

For this reason, we propose an ammonia injection grid of the SCR denitration system.

SUMMERY OF THE UTILITY MODEL

The utility model mainly solves the technical problems in the prior art and provides an ammonia injection grid of an SCR denitration system.

In order to achieve the purpose, the ammonia injection grid of the SCR denitration system comprises ammonia injection branch pipes, wherein a plurality of groups of ammonia injection branch pipes are vertically and alternately combined to form the ammonia injection grid, a plurality of groups of nozzle pipes are fixedly welded on the ammonia injection grid in an upward vertical mode and are uniformly distributed on the ammonia injection grid, a blast cap is coaxially arranged on each nozzle pipe, a plurality of groups of spiral blades are installed on the outer wall surface of the blast cap in a threaded mode, an outer annular groove is formed in the position, close to the upper side, of the outer wall surface of the blast cap, an inner annular groove is formed in the position, close to the upper side, of the inner wall surface of the blast cap, L-shaped support rods which are distributed in a left-right mirror image mode are fixedly installed on the side wall surface of each nozzle pipe, and an extension block and a connecting block are fixedly installed on one side, close to each other, of the two groups of the L-shaped support rods.

Preferably, the blast cap is of a funnel structure with a larger upper diameter and a smaller lower diameter, and has an elastic characteristic.

Preferably, the extension block and the connecting block are located on the same side and are distributed vertically and correspondingly, the extension block is rotatably provided with balls with structures matched with the inner side annular groove structure, and the outer side face of the connecting block is movably provided with balls with structures matched with the outer side annular groove structure.

Preferably, the extension block is slidably connected with the inner annular groove through corresponding balls, the connection block is slidably connected with the outer annular groove through corresponding balls, and the wind caps are movably mounted between the two sets of L-shaped supporting rods through the mutual matching of the outer annular groove and the inner annular groove with the corresponding balls respectively.

Preferably, a set of fixed mounting has the horizontal pole on the extension piece, and one side fixed mounting that the horizontal pole kept away from the extension piece has the montant, and the montant distributes in the inside centre of a circle point position department of hood, the excircle department of montant is close to downside position department and has seted up the screw thread section.

Preferably, the lower end of the hood is rotatably provided with a nut, and the hood is in threaded connection with the vertical rod through the nut.

Advantageous effects

The utility model provides an ammonia injection grid of an SCR denitration system. The method has the following beneficial effects:

(1) this SCR deNOx systems spouts ammonia grid, when the ammonia through spout the vertical blowout that makes progress of ammonia branch pipe and nozzle pipe, the air current will blow to multiunit helical blade, and multiunit helical blade receives the influence of air current to drive the hood free rotation, disperses the ammonia air current through multiunit helical blade, makes originally vertical ascending ammonia air current become to become certain angle to diffusion all around, has reached the effect that ammonia and flue gas fully contacted.

(2) This SCR deNOx systems spouts ammonia grid, when the ammonia through spout the vertical during upwards blowout of ammonia branch pipe and nozzle pipe, the air current will be blown to multiunit helical blade, multiunit helical blade receives the influence of air current to drive the hood free rotation, disperse the ammonia air current through multiunit helical blade, make originally vertical ascending ammonia air current become certain angle to diffusion all around, through the hood that sets up, in the dirt impurity that makes ammonia and flue gas reaction produce can not drop the ammonia branch pipe, the effect of avoiding spouting the ammonia branch pipe jam has been reached.

(3) This SCR deNOx systems spouts ammonia grid, make the nut reciprocate on the montant through rotating the nut, when the nut rebound on the montant, the nut drives the lower extreme rebound of hood, and when the nut rebound on the montant, the nut drives the lower extreme of hood and moves to together, through the inclination of the upper and lower position free control hood surface of adjusting nut, has reached the effect of free adjustment blowout ammonia to diffusion angle all around.

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 described below. It should be apparent that the drawings in the following description are merely exemplary, and that other embodiments can be derived from the drawings provided by those of ordinary skill in the art without inventive effort.

The structures, the proportions, the sizes, and the like shown in the specification are only used for matching with the contents disclosed in the specification, so that those skilled in the art can understand and read the present invention, and do not limit the conditions for implementing the present invention, so that the present invention has no technical essence, and any modifications of the structures, changes of the proportion relation, or adjustments of the sizes, should still fall within the scope of the technical contents disclosed in the present invention without affecting the efficacy and the achievable purpose of the present invention.

FIG. 1 is a schematic view of the overall structure of the present invention;

FIG. 2 is a perspective view of the nozzle tube and the nozzle cap of the present invention;

FIG. 3 is a schematic perspective view of a nozzle tube according to the present invention;

FIG. 4 is an enlarged view of the structure at A in FIG. 3 according to the present invention;

fig. 5 is a schematic perspective view of the hood of the present invention.

Illustration of the drawings:

1. an ammonia injection branch pipe; 2. a nozzle tube; 3. a hood; 4. a helical blade; 5. an outer annular groove; 6. an inner annular groove; 7. an L-shaped strut; 8. an extension block; 9. connecting blocks; 10. a ball bearing; 11. a cross bar; 12. a vertical rod; 13. a threaded section; 14. and a nut.

Detailed Description

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 only a part of the embodiments of the present invention, and not all of the embodiments. 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.

Example (b): an ammonia injection grid of an SCR denitration system, as shown in figures 1-5, comprises ammonia injection branch pipes 1, a plurality of groups of ammonia injection branch pipes 1 are mutually staggered to form the ammonia injection grid, a plurality of groups of nozzle pipes 2 are fixedly welded on the ammonia injection grid in an upward vertical direction, the plurality of groups of nozzle pipes 2 are uniformly distributed on the ammonia injection grid, ammonia gas is vertically upwards injected through the ammonia injection branch pipes 1 and the nozzle pipes 2, a hood 3 is coaxially arranged on the nozzle pipes 2, the hood 3 is of a funnel structure with a large upper diameter and a small lower diameter, the hood 3 has an elastic characteristic, a plurality of groups of helical blades 4 are arranged on the outer wall surface of the hood 3 in a threaded manner, an outer annular groove 5 is arranged on the outer wall surface of the hood 3 close to the upper side, an inner annular groove 6 is arranged on the inner wall surface of the hood 3 close to the upper side, L-shaped support rods 7 distributed in a left-right mirror image manner are fixedly arranged on the side wall surface of the nozzle pipes 2, an extension block 8 and a connecting block 9 are respectively fixedly arranged on one side of the two groups of the L-shaped support rods 7 close to each other, the extension blocks 8 and the connecting blocks 9 are distributed correspondingly up and down, the two sets of extension blocks 8 are distributed in a left-right mirror image mode, the two sets of connecting blocks 9 are also distributed in a left-right mirror image mode, the balls 10 with structures matched with the structures of the inner annular grooves 6 are rotatably arranged on the extension blocks 8, the balls 10 with structures matched with the structures of the outer annular grooves 5 are movably arranged on the outer side surfaces of the connecting blocks 9, the extension blocks 8 are slidably connected with the inner annular grooves 6 through the corresponding balls 10, the connecting blocks 9 are slidably connected with the outer annular grooves 5 through the corresponding balls 10, the wind caps 3 are movably arranged between the two sets of L-shaped supporting rods 7 through the mutual matching of the outer annular grooves 5 and the inner annular grooves 6 and the corresponding balls 10 respectively, when ammonia gas is vertically and upwards sprayed out through the ammonia spraying branch pipe 1 and the nozzle pipe 2, the air flow is blown to the multiple sets of helical blades 4, and the multiple sets of helical blades 4 are driven by the air flow to freely rotate, the ammonia gas flow is dispersed through a plurality of groups of helical blades 4, the original vertical upward ammonia flow is changed into a certain angle and is diffused all around, the ammonia gas is fully contacted with the smoke gas, a group of extending blocks 8 is fixedly provided with a cross rod 11, one side of the cross rod 11 far away from the extending blocks 8 is fixedly provided with a vertical rod 12, the vertical rod 12 is distributed at the position of the inner center point of the hood 3, the position of the outer circle of the vertical rod 12 close to the lower side is provided with a threaded section 13, the lower end of the hood 3 is rotatably provided with a nut 14, the hood 3 is in threaded connection with the vertical rod 12 through the nut 14, by rotating the nut 14, the nut 14 moves up and down the post 12, as the nut 14 moves up the post 12, the nut 14 drives the lower end of the hood 3 to move upwards, when the nut 14 moves downwards on the vertical rod 12, the nut 14 drives the lower end of the blast cap 3 to move together, and the inclination angle of the outer surface of the blast cap 3 is freely controlled by adjusting the upper position and the lower position of the nut 14.

The working principle of the utility model is as follows: when the ammonia was through spouting the vertical blowout that makes progress of ammonia branch pipe 1 and nozzle pipe 2, the air current will blow to multiunit helical blade 4, and multiunit helical blade 4 receives the influence of air current to drive hood 3 free rotation, disperses the ammonia air current through multiunit helical blade 4, makes originally vertical ascending ammonia air current become to become certain angle to diffusion all around, makes ammonia and flue gas fully contact.

The nut 14 is driven to move up and down on the vertical rod 12 by rotating the nut 14, when the nut 14 moves up on the vertical rod 12, the nut 14 drives the lower end of the hood 3 to move up, when the nut 14 moves down on the vertical rod 12, the nut 14 drives the lower end of the hood 3 to move together, and the inclination angle of the outer surface of the hood 3 is freely controlled by adjusting the up-down position of the nut 14.

The foregoing shows and describes the general principles and features of the present invention, together with the advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the utility model as claimed. The scope of the utility model is defined by the appended claims and equivalents thereof.

Claims

The utility model provides a SCR deNOx systems spouts ammonia grid, including spouting ammonia branch pipe (1), the ammonia grid is spouted to the multiunit ammonia branch pipe (1) mutually perpendicular crisscross constitution, the last vertical fixed welding that makes progress of spouting ammonia grid has multiunit nozzle pipe (2), and multiunit nozzle pipe (2) evenly distributed is on the ammonia grid, its characterized in that: be coaxial on nozzle pipe (2) and be provided with hood (3), the outer wall of hood (3) is personally submitted the screw thread form and is installed multiunit helical blade (4), the outer wall of hood (3) is close to upside position department and has seted up outside ring channel (5), the internal face of hood (3) is close to upside position department and has seted up inboard ring channel (6), the lateral wall face fixed mounting of nozzle pipe (2) has L shape branch (7) that mirror image distributes about being, and is two sets of one side that L shape branch (7) are close to each other is fixed mounting respectively has extension piece (8) and connecting block (9).
2. The SCR denitration system ammonia injection grid of claim 1, wherein: the blast cap (3) is of a funnel structure with a large upper diameter and a small lower diameter, and the blast cap (3) has an elastic characteristic.
3. The SCR denitration system ammonia injection grid of claim 1, wherein: lie in same side extend piece (8) and connecting block (9) and be corresponding the distribution from top to bottom, it installs ball (10) of structure and inboard ring channel (6) structure looks adaptation to rotate on extending piece (8), the lateral surface movable mounting of connecting block (9) has ball (10) of structure and outside ring channel (5) structure looks adaptation.
4. The SCR denitration system ammonia injection grid of claim 3, wherein: the extension block (8) is connected with the inner side annular groove (6) in a sliding mode through the corresponding ball (10), the connecting block (9) is connected with the outer side annular groove (5) in a sliding mode through the corresponding ball (10), and the air cap (3) is movably mounted between the two sets of L-shaped supporting rods (7) through the outer side annular groove (5) and the inner side annular groove (6) in a matched mode respectively with the corresponding ball (10).
5. The SCR denitration system ammonia injection grid of claim 1, wherein: a set of fixed mounting has horizontal pole (11) on extension piece (8), and one side fixed mounting that extension piece (8) were kept away from in horizontal pole (11) has montant (12), and montant (12) distribute in the inside centre of circle point position department of hood (3), the excircle department of montant (12) is close to downside position department and has seted up screw thread section (13).
6. The SCR denitration system ammonia injection grid of claim 5, wherein: the lower end of the blast cap (3) is rotatably provided with a nut (14), and the blast cap (3) is in threaded connection with the vertical rod (12) through the nut (14).