CN215352900U - A prevent stifled type ammonia injection grid for deNOx systems and mounting structure thereof - Google Patents
A prevent stifled type ammonia injection grid for deNOx systems and mounting structure thereof Download PDFInfo
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- CN215352900U CN215352900U CN202121511367.1U CN202121511367U CN215352900U CN 215352900 U CN215352900 U CN 215352900U CN 202121511367 U CN202121511367 U CN 202121511367U CN 215352900 U CN215352900 U CN 215352900U
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- denitration system
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Abstract
The utility model discloses an anti-blocking ammonia injection grid for a denitration system and an installation structure thereof, wherein the anti-blocking ammonia injection grid for the denitration system comprises ammonia injection branch pipes; more than two nozzles are arranged on the ammonia spraying branch pipe, and the spraying directions of the nozzles are downward; all be equipped with the V-arrangement that the opening is decurrent on the export of every nozzle and prevent stifled board, V-arrangement prevents stifled board one end and is pointed end, the other end for the open end, and the pointed end of V-arrangement prevents stifled board is connected on the export of nozzle, and the V-arrangement prevents stifled board most advanced length direction and nozzle export radial unanimity, and the V-arrangement prevents that the length direction's of stifled board both ends all surpass the radial both ends in export of nozzle. According to the anti-blocking ammonia injection grid for the denitration system, due to the downward arrangement of the nozzles and the arrangement of the V-shaped anti-blocking plate at the outlet of the nozzles, flying ash in a flue is prevented from falling to block the nozzles, so that sediment in the flue can be conveniently discharged, and the blockage is not easy to occur; meanwhile, the spraying range of the ammonia gas is expanded, the deposit in the outlet pipe is easy to carry, and the nozzle and the smoke gas can be effectively prevented from being collided.
Description
Technical Field
The utility model relates to an anti-blocking ammonia injection grid for a denitration system and an installation structure thereof, and belongs to the technical field of denitration of coal-fired power stations.
Background
The ammonia injection grid is arranged in the vertical flue of deNOx systems entry basically among current deNOx systems, avoids nozzle and flue gas stream offset to cause the ammonia injection pipe to hold back gas, and the gas in the ammonia injection pipe generally designs into the windward blowout, and the nozzle is vertical upwards promptly, in addition for ensureing ammonia injection velocity and injection range, the nozzle of ammonia injection grid is usually the diameter very little, arrange densely, but this kind of arrangement easily leads to the nozzle to block up, mainly because two kinds of reasons: firstly, when the machine is stopped or the flow speed of flue gas in the flue is low, fly ash in the flue falls down to block the nozzle; secondly, the nozzle is vertically upward, sediments (such as corrosion-stripped parts inside the pipeline, urea crystals, fly ash and the like) in the pipeline are difficult to discharge, and blockage of the nozzle can cause unbalance of ammonia injection in the flue and increase of resistance of an ammonia injection system, so that the problems of difficulty in leveling ammonia nitrogen molar ratio, reduction of denitration efficiency, low pressure head of a dilution fan and the like are caused.
SUMMERY OF THE UTILITY MODEL
Aiming at the problems, the utility model provides an anti-blocking ammonia injection grid for a denitration system and an installation structure thereof, which can ensure that nozzles are arranged downwards, avoid the nozzles from colliding with flue gas flow and expand the ammonia injection range.
In order to solve the technical problems, the technical scheme adopted by the utility model is as follows:
an anti-blocking ammonia injection grid for a denitration system comprises an ammonia injection branch pipe; more than two nozzles are arranged on the ammonia spraying branch pipe, and the spraying directions of the nozzles are downward; all be equipped with the V-arrangement that the opening is decurrent on the export of every nozzle and prevent stifled board, V-arrangement prevents stifled board one end and is pointed end, the other end for the open end, and the pointed end of V-arrangement prevents stifled board is connected on the export of nozzle, and the V-arrangement prevents stifled board most advanced length direction and nozzle export radial unanimity, and the V-arrangement prevents that the length direction's of stifled board both ends all surpass the radial both ends in export of nozzle.
In the device, the nozzles are prevented from being plugged by falling of fly ash in the flue through downward arrangement of the nozzles and arrangement of the V-shaped anti-blocking plate at the outlet of the nozzles, so that the discharge of sediments in the flue is facilitated, the ammonia gas injection range is expanded, and the nozzles and flue gas flow can be prevented from being collided.
The ammonia flowing out of the nozzle outlet is dispersed along two sides of the V-shaped anti-blocking plate, so that the ammonia spraying range is remarkably expanded. The two ends of the length direction of the V-shaped anti-blocking plate exceed the two ends of the outlet of the nozzle in the radial direction, namely the two ends of the length direction of the tip of the V-shaped anti-blocking plate exceed the two ends of the outlet of the nozzle in the radial direction, so that the ammonia gas flowing out of the outlet of the nozzle can be well diffused.
In order to save cost and meet engineering requirements, the V-shaped anti-blocking plate is of a single-layer structure.
In order to further expand the ammonia gas spraying range, the included angle of the tip of the V-shaped anti-blocking plate is preferably 50-100 degrees. The V-shaped anti-blocking plate is formed by splicing two plates with included angles of 50-100 degrees, and two adjacent long edges of the two plates are connected together along the length direction to form a tip. The length direction of the V-shaped anti-blocking plate is consistent with the length direction of the two plates.
For the convenience of installation, the length direction of the V-shaped anti-blocking plate is vertical to the length direction of the ammonia spraying branch pipe.
In order to further expand the ammonia gas injection range, the length directions of the V-shaped anti-blocking plates on two adjacent nozzles on the same ammonia injection branch pipe are mutually vertical. Namely the V-shaped anti-blocking plates on the same ammonia spraying branch pipe are arranged in a staggered way.
As a preferred specific implementation mode, the side length of the V-shaped anti-blocking plate is 45-100 mm, and the thickness of the V-shaped anti-blocking plate is 2-8 mm; the diameter of the nozzle is 20-50 mm.
In order to ensure the stability requirement of the device, the tip of the V-shaped anti-blocking plate is welded on the outlet of the nozzle,
in order to ensure that the gas output of each nozzle tends to be uniform, the ammonia spraying branch pipes are preferably arranged in an I shape.
The anti-blocking type ammonia injection grid for the denitration system is arranged in a flue at the inlet of the denitration system, and the ammonia injection branch pipe can extend out of the flue and is connected with an ammonia injection partition header or an ammonia injection main pipe.
The prior art is referred to in the art for techniques not mentioned in the present invention.
According to the anti-blocking ammonia injection grid for the denitration system, due to the downward arrangement of the nozzles and the arrangement of the V-shaped anti-blocking plate at the outlet of the nozzles, flying ash in a flue is prevented from falling to block the nozzles, so that sediment in the flue can be conveniently discharged, and the blockage is not easy to occur; meanwhile, the spraying range of the ammonia gas is expanded, the deposit in the outlet pipe is easy to carry, and the nozzle and the smoke gas can be effectively prevented from being collided.
Drawings
FIG. 1 is a three-dimensional structure diagram of the use state of the anti-blocking type ammonia injection grid for a denitration system of the present invention.
Fig. 2 is a view from a in fig. 1.
Fig. 3 is a view from direction B of fig. 1.
Fig. 4 is a view from direction C of fig. 1.
FIG. 5 is a view showing the connection of the nozzle to the V-shaped block-preventing plate in the example.
In the figure, 1 is an ammonia spraying branch pipe, 2 is a nozzle, 3 is a V-shaped anti-blocking plate, 31 is a tip, 32 is an opening end, 4 is in an A direction, 5 is in a B direction, 6 is in a C direction, 7 is ammonia-air mixed gas, and 8 is flue gas.
Detailed Description
In order to better understand the present invention, the following examples are further provided to illustrate the present invention, but the present invention is not limited to the following examples.
Example 1
As shown in fig. 1 to 5, an anti-blocking type ammonia injection grid for a denitration system comprises ammonia injection branch pipes; more than two nozzles are arranged on the ammonia spraying branch pipe, and the spraying directions of the nozzles are downward; all be equipped with the V-arrangement that the opening is decurrent on the export of every nozzle and prevent stifled board, V-arrangement prevents stifled board one end and is pointed end, the other end for the open end, and the pointed end welding of stifled board is prevented to V-arrangement is on the export of nozzle, and the V-arrangement prevents stifled board most advanced length direction and nozzle export radial unanimity, and the V-arrangement prevents that the length direction's of stifled board both ends all surpass the radial both ends in export of nozzle.
In the device, the nozzles are prevented from being plugged by falling of fly ash in the flue through downward arrangement of the nozzles and arrangement of the V-shaped anti-blocking plate at the outlet of the nozzles, so that the discharge of sediments in the flue is facilitated, the ammonia gas injection range is expanded, and the nozzles and flue gas flow can be prevented from being collided.
During the installation, above-mentioned anti-blocking type ammonia injection grid for deNOx systems arranges in deNOx systems entry flue, spouts ammonia branch pipe and can extend to outside the flue and spout ammonia subregion header or spout the female union coupling of ammonia.
When spouting the ammonia, the ammonia flows to the nozzle through spouting ammonia branch pipe, and the applicant utilizes CFD numerical simulation technical analysis and practice to verify, adopts above-mentioned structure, and the ammonia is from spouting ammonia branch pipe to nozzle when flowing, and the diffusion range is wider, portable goes out intraductal deposit to effectively prevent nozzle and flue gas offset, solved the easy stifled problem of ordinary ammonia grid that spouts, thereby create good technical condition for the high-efficient operation of denitrification facility.
Example 2
On the basis of the embodiment 1, the following improvements are further made: in order to save cost and meet engineering requirements, the V-shaped anti-blocking plate is of a single-layer structure. In order to further expand the ammonia gas injection range, the included angle of the tip of the V-shaped anti-blocking plate is 90 degrees (angle steel).
Example 3
Essentially the same as in example 2, except that: the included angle of the V-shaped anti-blocking plate tip is 60 degrees.
Example 4
On the basis of the embodiment 2 or 3, the following improvements are further made: for the convenience of installation, the length direction of the V-shaped anti-blocking plate is vertical to the length direction of the ammonia spraying branch pipe. In order to further expand the ammonia gas injection range, the length directions of the V-shaped anti-blocking plates on two adjacent nozzles on the same ammonia injection branch pipe are mutually vertical. Namely the V-shaped anti-blocking plates on the same ammonia spraying branch pipe are arranged in a staggered way.
Example 5
On the basis of the embodiment 4, the following improvements are further made: in order to ensure that the gas output of each nozzle tends to be uniform, the ammonia spraying branch pipes are arranged in an I shape.
Example 6
On the basis of the embodiment 5, the following improvements are further made: the side length of the V-shaped anti-blocking plate is 50mm, the thickness of the V-shaped anti-blocking plate is 3mm, and a welding seam at the joint of the V-shaped anti-blocking plate and the nozzle is 14 mm; the diameter of the nozzle is 30 mm; in practice, the aforementioned data may also be other values within the limits defined in the present application.
Practice proves that the anti-blocking ammonia injection grid for the denitration system can achieve the effects of preventing the nozzle from being blocked and enlarging the ammonia diffusion range, and tests show that the anti-blocking ammonia injection grid for the denitration system meets the regulations of DL/T296-2011 'guide rule for flue gas denitration technology of thermal power plants'.
Claims (9)
1. The utility model provides an anti-blocking type ammonia injection grid for deNOx systems which characterized in that: comprises an ammonia spraying branch pipe; more than two nozzles are arranged on the ammonia spraying branch pipe, and the spraying directions of the nozzles are downward; all be equipped with the V-arrangement that the opening is decurrent on the export of every nozzle and prevent stifled board, V-arrangement prevents stifled board one end and is pointed end, the other end for the open end, and the pointed end of V-arrangement prevents stifled board is connected on the export of nozzle, and the V-arrangement prevents stifled board most advanced length direction and nozzle export radial unanimity, and the V-arrangement prevents that the length direction's of stifled board both ends all surpass the radial both ends in export of nozzle.
2. The anti-blocking type ammonia injection grid for a denitration system of claim 1, wherein: the V-shaped anti-blocking plate is of a single-layer structure.
3. The anti-blocking type ammonia injection grid for a denitration system according to claim 1 or 2, characterized in that: the included angle of the V-shaped anti-blocking plate tip is 50-100 degrees.
4. The anti-blocking type ammonia injection grid for a denitration system according to claim 1 or 2, characterized in that: the length direction of the V-shaped anti-blocking plate is vertical to the length direction of the ammonia spraying branch pipe.
5. The anti-blocking type ammonia injection grid for a denitration system of claim 4, wherein: the length directions of the V-shaped anti-blocking plates on two adjacent nozzles on the same ammonia spraying branch pipe are mutually vertical.
6. The anti-blocking type ammonia injection grid for a denitration system according to claim 1 or 2, characterized in that: the side length of the V-shaped anti-blocking plate is 40-100 mm, and the thickness of the V-shaped anti-blocking plate is 2-8 mm; the diameter of the nozzle is 20-50 mm.
7. The anti-blocking type ammonia injection grid for a denitration system according to claim 1 or 2, characterized in that: the tip of the V-shaped anti-blocking plate is welded on the outlet of the nozzle.
8. The anti-blocking type ammonia injection grid for a denitration system according to claim 1 or 2, characterized in that: the ammonia spraying branch pipes are arranged in an I shape.
9. The installation structure of the anti-clogging type ammonia injection grid for a denitration system according to any one of claims 1 to 8, wherein: an anti-blocking type ammonia injection grid for a denitration system is arranged in a flue at the inlet of the denitration system, and an ammonia injection branch pipe can extend out of the flue and is connected with an ammonia injection partition header or an ammonia injection main pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121511367.1U CN215352900U (en) | 2021-07-05 | 2021-07-05 | A prevent stifled type ammonia injection grid for deNOx systems and mounting structure thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121511367.1U CN215352900U (en) | 2021-07-05 | 2021-07-05 | A prevent stifled type ammonia injection grid for deNOx systems and mounting structure thereof |
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| CN215352900U true CN215352900U (en) | 2021-12-31 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115364642A (en) * | 2022-09-20 | 2022-11-22 | 大唐华银电力股份有限公司金竹山火力发电分公司 | Denitration system ammonia-injection nozzle anti-blocking device and denitration system |
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2021
- 2021-07-05 CN CN202121511367.1U patent/CN215352900U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115364642A (en) * | 2022-09-20 | 2022-11-22 | 大唐华银电力股份有限公司金竹山火力发电分公司 | Denitration system ammonia-injection nozzle anti-blocking device and denitration system |
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