CN210251872U - Novel anti-blocking special countercurrent injection type ammonia injection grid for SCR denitration - Google Patents
Novel anti-blocking special countercurrent injection type ammonia injection grid for SCR denitration Download PDFInfo
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- CN210251872U CN210251872U CN201920829542.8U CN201920829542U CN210251872U CN 210251872 U CN210251872 U CN 210251872U CN 201920829542 U CN201920829542 U CN 201920829542U CN 210251872 U CN210251872 U CN 210251872U
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Abstract
The utility model provides a novel prevent blockking up special countercurrent injection formula ammonia injection grid of SCR denitration, including the flue, the flue is equipped with the ammonia outward and is responsible for, the ammonia is responsible for and is gone up from preceding equidistant intercommunication in proper order has a plurality of to control the spray tube that extends, set up the mounting hole that a plurality of supplied spray tube to stretch into in the flue on the flue right side wall, and be equipped with the mounting flange plate outside the mounting hole, the spray tube stretches into in the flue from the mounting hole, and the right part of spray tube corresponds the mounting flange plate and is equipped with the spray tube ring flange to fix the spray tube ring flange on the mounting flange plate through screw bolt and nut, the inboard of flue left side wall is equipped with the fixed cassette that supplies spray tube left end card to go into, the spray tube is located and is equipped with a plurality of shower nozzle along the axial equidistant on the position in the flue, the inside spray tube bearing bridge. Greatly saves the mixing time of the flue gas and the ammonia gas, can be installed in a short-distance flue for work, and meets the requirement of being in countercurrent contact with the flue gas and simultaneously injecting the ammonia gas to cover the whole flue.
Description
Technical Field
The utility model relates to a flue gas treatment facility technical field, concretely relates to novel prevent blockking up special back flow injection formula ammonia injection grid of SCR denitration.
Background
In a common SCR denitration process, each company can design ammonia spraying equipment at a certain position of a reactor inlet flue so as to ensure NH in flue gas at the inlet of an SCR reactor3/NOxThe distribution is even, thus being beneficial to the reaction of the catalyst in the SCR reactor and the flue gas and keeping higher denitration efficiency.
The ammonia injection equipment is usually designed on a vertical pipeline between the flue gas heating equipment and the SCR reactor, the pipeline at the section is generally shorter under the influence of the height of a steel structure, enough uniform mixing effect is ensured in the short pipeline, and the design of the ammonia injection equipment is very important. Several currently common ammonia injection devices have the following combinations:
(1) double-fluid spray gun and pipeline mixer
(2) Ammonia evaporation mixer/pyrolysis furnace + ammonia injection grid
The first kind of combination domestic waste incineration plant is not widely applied, mainly has certain requirements on flue gas parameters, when the flue gas volume is larger, the size of a pipeline mixer is very large, and has higher requirements on field installation conditions, meanwhile, a reducing agent is atomized by a spray gun and then directly injected into a pipeline, the gasification of the reducing agent needs a certain temperature, the combination can only use an ammonia reducing agent, and the denitration can not use a urea reducing agent (the urea pyrolysis temperature is 500 ℃, an independent pyrolysis furnace is often adopted)
The second type of combination is widely applied in China, ammonia or urea reducing agents are prepared into ammonia gas in respective preparation systems and then enter an ammonia spraying grid to be fully mixed and enter a flue, and the mixing time of the ammonia gas and flue gas in a pipeline is greatly reduced through the equipment, so that the equipment is suitable for more extreme installation environments.
The ammonia injection grid is mainly of a counter-flow type according to the flow direction of ammonia injection, and the traditional counter-flow type can have stronger mixing effect, but the following technical problems are easy to occur: 1. the nozzle is in countercurrent and forward contact with the flue gas, so that the nozzle is seriously abraded, the ammonia spraying amount is deviated due to the deformation of the nozzle for a period of time, and the nozzle needs to be integrally replaced when the nozzle is damaged to a certain degree; 2. the device is not easy to disassemble for maintenance after being damaged; 3. the traditional nozzle is a branch pipe outer wall opening, and the nozzle is not wear-resistant.
SUMMERY OF THE UTILITY MODEL
The utility model discloses aim at solving the technical problem who exists among the prior art at least, innovated a novel prevent blockking up special back flow injection formula of SCR denitration and spout ammonia grid very much to reduce the wearing and tearing of nozzle, improve the mixing efficiency of ammonia and flue gas.
In order to realize the above object of the utility model, the utility model provides a novel prevent stopping up special countercurrent injection formula ammonia injection grid of SCR denitration, including the flue, be equipped with the ammonia gas person in charge outside the flue, the ammonia is responsible for and is gone up from preceding equidistant intercommunication of backward has a plurality of spray tube of extending about, set up a plurality of on the flue right side wall and supply the spray tube to stretch into the mounting hole in the flue, and the mounting hole is equipped with the mounting flange outward, the spray tube stretches into in the flue from the mounting hole, and the right part of spray tube corresponds the mounting flange and is equipped with the spray tube flange dish, and fixes the spray tube flange dish on the mounting flange dish through screw bolt and nut, the spray tube is located and is equipped with two rows of shower nozzles along axial equidistant on the position in the flue, two rows of shower nozzles are located the front and back both sides on the spray tube respectively, and the contained angle β between the central line;
the front row of spray heads and the rear row of spray heads of the spray pipe positioned in the middle are symmetrically arranged along the vertical center line of the cross section of the spray pipe, and the included angle β of the two rows of spray heads of the spray pipe positioned in the middle is larger than 90 degrees and smaller than 170 degrees.
The ammonia main pipe is used for providing pressure for ammonia spraying, guiding the ammonia to the spray head through the spray pipe, and spraying the ammonia into the flue from the spray head. The mounting flange and the spray pipe flange are used for fixing the spray pipe and are connected through bolts and nuts so as to be convenient to mount and dismount. Two rows of spray heads are arranged and are respectively positioned on the front side and the rear side of the spray pipe, so that dead angles can be reduced, and the contact degree of ammonia gas and flue gas is improved. The included angles of the front and rear two rows of spray heads of the spray pipe positioned in the middle part for spraying ammonia gas are consistent, and the spray range of the spray pipe can be increased as much as possible.
In the scheme, the included angles β of the two rows of spray heads on the foremost spray pipe and the rearmost spray pipe are both equal to 90 degrees, wherein the row of spray heads arranged on the foremost spray pipe close to the front side is positioned above the row of spray heads arranged on the rearmost spray pipe close to the rear side;
the row of spray heads arranged on the spray pipe at the last side close to the front side is positioned below the row of spray heads arranged on the spray pipe close to the rear side.
Spray heads located at the frontmost and rearmost sides are prevented from spraying onto the front and rear side walls of the flue.
In the scheme, the method comprises the following steps: still include the header, adjacent two the spray tube links to each other with the ammonia outlet of same header, seted up into the ammonia mouth on the header, be equipped with the header ring flange on this ammonia inlet of header, the header passes through the header ring flange and links to each other with the ring flange on the ammonia outlet on being responsible for. Can reduce the trompil on the ammonia is responsible for, improve the ammonia and be responsible for the support intensity.
In the scheme, the method comprises the following steps: and a fixed clamping seat for clamping the left end of the spray pipe is arranged on the inner side of the left side wall of the flue. The fixed clamping seat is used for fixing the left end of the spray pipe, and supports the left end of the spray pipe, so that the stability of the spray pipe is improved.
In the scheme, the method comprises the following steps: and a spray pipe bearing bridge extending leftwards and rightwards is arranged in the flue. The spray pipe bearing bridge is used for guiding the spray pipe to move towards the fixed clamping seat, so that the left end of the spray pipe can be clamped into the fixed clamping seat conveniently, and the spray pipe bearing bridge is also used for supporting the spray pipe.
In the scheme, the method comprises the following steps: the spray pipe supporting bridge is V-shaped. The stability of the spray pipe is improved.
In the scheme, the method comprises the following steps: the nozzle is made of wear-resistant materials. The service life of the spray head is prolonged, the abrasion is reduced, and the maintenance workload and the maintenance cost are reduced.
In the scheme, the method comprises the following steps: the aperture of mounting hole satisfies and lets two spray tubes of connecting on same header pass simultaneously, and connects two spray tubes on same header and also connect on same spray tube ring flange. The spray pipe is convenient to put in and install.
To sum up, owing to adopted above-mentioned technical scheme, the beneficial effects of the utility model are that: the mixing time of the flue gas and the ammonia gas is greatly saved, and the flue gas and the ammonia gas can be installed in a short-distance flue for work; a certain angle is designed between the spray head and the spray head, so that the spray head can be in countercurrent contact with the flue gas and can spray ammonia gas to cover the whole flue; the design of the reinforced nozzle can prolong the service life of the equipment; the easy detachable design makes maintenance management simpler.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a schematic structural diagram of the present invention;
FIG. 2 is a cross-sectional view taken at E-E of FIG. 1;
FIG. 3 is an enlarged schematic view at A in FIG. 2;
FIG. 4 is an enlarged schematic view at B in FIG. 2;
FIG. 5 is a cross-sectional view taken at C-C of FIG. 1;
fig. 6 is a cross-sectional view taken at D-D in fig. 1.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present invention, and should not be construed as limiting the present invention.
As shown in fig. 1-6, a novel anti-clogging counter-flow injection type ammonia injection grid special for SCR denitration comprises a flue 1, an ammonia main pipe is arranged outside the flue 1, a plurality of spray pipes 2 extending left and right are sequentially communicated with the ammonia main pipe from front to back at equal intervals, a plurality of mounting holes 11 for the spray pipes 2 to extend into the flue 1 are arranged on the right side wall of the flue 1, and a mounting flange 42 is arranged outside the mounting hole 11, the spray pipe 2 extends into the flue 1 from the mounting hole 11, a spray pipe flange 41 is arranged at the right part of the spray pipe 2 corresponding to the mounting flange 42, the spray pipe flange 41 is fixed on the mounting flange 42 through bolts and nuts, the inner side of the left side wall of the flue 1 is provided with a fixed clamping seat 51 for clamping the left end of the spray pipe 2, the position of the spray pipe 2 in the flue 1 is provided with a plurality of spray heads 21 at equal intervals along the axial direction, and the spray heads 21 are made of wear-resistant materials. The inside spray tube bearing bridge 52 that extends about being equipped with of flue 1, spray tube bearing bridge 52 is the V type, and the left end of spray tube bearing bridge 52 extends to being close to fixed cassette 51, and the right-hand member of spray tube bearing bridge 52 is fixed on the right side wall of flue 1.
Still include header 3, adjacent two the spray tube 2 links to each other with the ammonia outlet of same header 3, seted up into the ammonia mouth on the header 3, be equipped with header ring flange 31 on this ammonia inlet of header 3, the header 3 is responsible for the ring flange on the ammonia outlet through header ring flange 31 and ammonia and is linked to each other.
And, the aperture of mounting hole 11 satisfies and lets two spray tubes 2 of connecting on same header 3 pass simultaneously, and connects two spray tubes 2 on same header 3 and also connects on same spray tube ring flange 41.
Two rows of spray heads 21 are arranged on the spray pipe 2, the two rows of spray heads 21 are respectively positioned at the front side and the rear side of the upper half part of the spray pipe 2, and an included angle β between the central lines of the two rows of spray heads 21 is smaller than 180 degrees.
The front and rear rows of spray heads 21 of the spray pipe 2 positioned in the middle are symmetrically arranged along the vertical center line of the cross section of the spray pipe 2, the included angle β between the front and rear rows of spray heads 21 of the spray pipe 2 positioned in the middle is larger than 90 degrees and smaller than 170 degrees, the spray heads 21 on the spray pipe 2 positioned in the middle are arranged close to the horizontal center line of the cross section of the spray pipe 2, and the center lines of the front and rear rows of spray heads 21 of the spray pipe 2 positioned in the middle and the horizontal center line of the cross section of the.
The angle β between the two rows of spray heads 21 on the frontmost spray bar 2a and the rearmost spray bar 2b is equal to 90 °, wherein the row of spray heads 21 on the frontmost spray bar 2a located further to the front is located above the row of spray heads 21 on the rearmost spray bar and the row of spray heads 21 on the rearmost spray bar 2b located further to the front is located below the row of spray heads 21 on the rearmost spray bar.
The ammonia gas enters the header 3 through the ammonia gas main pipe, continues to flow into the spray pipe 2 through the header 3, is sprayed out from the spray head 21, and enters the flue 1 to be mixed with the flue gas. The spray head 2 positioned in the middle can spray to a position with a longer horizontal distance as much as possible, so that the spray range is improved, and dead angles are reduced.
While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.
Claims (8)
1. The novel anti-blocking countercurrent injection type ammonia injection grid special for SCR denitration is characterized by comprising a flue (1), wherein an ammonia main pipe is arranged outside the flue (1), a plurality of spray pipes (2) extending left and right are sequentially communicated with the ammonia main pipe at equal intervals from front to back, a plurality of mounting holes (11) for the spray pipes (2) to extend into the flue (1) are formed in the right side wall of the flue (1), mounting flanges (42) are arranged outside the mounting holes (11), the spray pipes (2) extend into the flue (1) from the mounting holes (11), spray pipe flanges (41) are arranged at the right parts of the spray pipes (2) corresponding to the mounting flanges (42), the spray pipe flanges (41) are fixed on the mounting flanges (42) through bolts and nuts, two rows of spray heads (21) are arranged at equal intervals along the axial direction on the part, located in the flue (1), the two rows of spray heads (21) are respectively located at the front side and the back side of the upper half part of the spray pipes (2), and the included angle β between the central lines of the two rows of spray heads (21) is smaller than 180 degrees;
the front and back rows of spray heads (21) of the spray pipe (2) positioned in the middle are symmetrically arranged along the vertical central line of the cross section of the spray pipe (2), and the included angle β of the two rows of spray heads (21) of the spray pipe (2) positioned in the middle is larger than 90 degrees and smaller than 170 degrees.
2. The novel anti-clogging special countercurrent injection type ammonia injection grid for SCR denitration according to claim 1, characterized in that the included angle β between two rows of spray heads (21) on the frontmost spray pipe (2a) and the rearmost spray pipe (2b) is equal to 90 degrees, wherein the row of spray heads (21) arranged on the frontmost spray pipe (2a) close to the front side is positioned above the row of spray heads (21) arranged on the rearmost spray pipe close to the rear side;
the row of spray heads (21) arranged on the front side of the spray pipe (2b) on the rearmost side is positioned below the row of spray heads (21) arranged on the rear side of the spray pipe.
3. The novel anti-clogging special countercurrent injection type ammonia injection grid for SCR denitration according to claim 1, characterized in that: still include header (3), adjacent two spray tube (2) link to each other with the ammonia outlet of same header (3), seted up into the ammonia mouth on header (3), be equipped with header ring flange (31) on this ammonia inlet of header (3), header (3) are connected to each other through the ring flange on header ring flange (31) and the ammonia outlet that is responsible for.
4. The novel anti-clogging special countercurrent injection type ammonia injection grid for SCR denitration according to claim 2, characterized in that: and a fixed clamping seat (51) for clamping the left end of the spray pipe (2) is arranged on the inner side of the left side wall of the flue (1).
5. The novel anti-clogging special countercurrent injection type ammonia injection grid for SCR denitration according to claim 4, characterized in that: and a spray pipe bearing bridge (52) extending left and right is arranged in the flue (1).
6. The novel anti-clogging special countercurrent injection type ammonia injection grid for SCR denitration according to claim 5, characterized in that: the nozzle supporting bridge (52) is V-shaped.
7. The novel anti-clogging special countercurrent injection type ammonia injection grid for SCR denitration according to claim 1, characterized in that: the spray head (21) is made of wear-resistant materials.
8. The novel anti-clogging special countercurrent injection type ammonia injection grid for SCR denitration according to claim 2, characterized in that: the aperture of mounting hole (11) satisfies and lets two spray tube (2) of connecting on same header (3) pass simultaneously, and connects two spray tube (2) on same header (3) also to be connected on same spray tube ring flange (41).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920829542.8U CN210251872U (en) | 2019-06-04 | 2019-06-04 | Novel anti-blocking special countercurrent injection type ammonia injection grid for SCR denitration |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920829542.8U CN210251872U (en) | 2019-06-04 | 2019-06-04 | Novel anti-blocking special countercurrent injection type ammonia injection grid for SCR denitration |
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| CN210251872U true CN210251872U (en) | 2020-04-07 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110124514A (en) * | 2019-06-04 | 2019-08-16 | 上海众仕环境科技股份有限公司 | A kind of dedicated upstream injection formula ammonia-spraying grid of Novel anti-blockage SCR denitration |
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2019
- 2019-06-04 CN CN201920829542.8U patent/CN210251872U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110124514A (en) * | 2019-06-04 | 2019-08-16 | 上海众仕环境科技股份有限公司 | A kind of dedicated upstream injection formula ammonia-spraying grid of Novel anti-blockage SCR denitration |
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