CN211159296U - A even injection system that is used for denitration bypass intensification or SCR denitration to spout ammonia - Google Patents
A even injection system that is used for denitration bypass intensification or SCR denitration to spout ammonia Download PDFInfo
- Publication number
- CN211159296U CN211159296U CN201921881086.8U CN201921881086U CN211159296U CN 211159296 U CN211159296 U CN 211159296U CN 201921881086 U CN201921881086 U CN 201921881086U CN 211159296 U CN211159296 U CN 211159296U
- Authority
- CN
- China
- Prior art keywords
- injection
- bypass
- denitration
- spraying
- flue
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Exhaust Gas Treatment By Means Of Catalyst (AREA)
Abstract
The utility model discloses an even injection system that is used for denitration bypass to heat up or SCR denitration to spout ammonia, including bypass flue and the bypass flue governing valve of setting on bypass flue, its characterized in that, even injection system still includes: the injection device is communicated with the bypass flue and is arranged at an inlet flue of the SCR reactor; the spraying device comprises a plurality of spraying units, the spraying units are hollow three-dimensional, the width of two ends of the transverse section of each spraying unit is smaller than the width of the middle of each spraying unit, the spraying units are aligned in the same direction, a Venturi tube structure is formed between every two spraying units, and a plurality of spraying ports are symmetrically arranged on the outer walls of two sides of the widest position of each spraying unit. By forming a Venturi tube structure between the injection units, the negative pressure at the injection position can be increased, and the amount of the flue gas led out by the bypass is increased; through the plurality of symmetrically arranged jet ports, the bypass flue gas and the main path flue gas are uniformly mixed, and the resistance is reduced.
Description
Technical Field
The utility model relates to an injection apparatus technical field, more specifically relates to an even injection system that is used for denitration bypass intensification or SCR denitration to spout ammonia.
Background
Nitrogen oxides (NOx) are one of the main atmospheric pollutants, which seriously harm human health with photochemical smog formed by hydrocarbons, and in addition, nitrogen oxides are one of the main causes of acid rain, and the frequent occurrence of acid rain has a great influence on the ecological environment and national economy. According to the improvement of national environmental protection requirements, the ultra-low emission of the smoke becomes the trend of environmental protection, and in order to enable nitrogen oxides to reach the ultra-low emission standard, the Selective Catalytic Reduction (SCR) denitration becomes the mainstream process, namely, a reducing agent is utilized to selectively react with the nitrogen oxides in the smoke under the action of a catalyst to generate nontoxic and pollution-free nitrogen (N)2) And water (H)2O) to achieve the aim of denitration. The denitration catalyst in the SCR system flow is an important device, and the commonly used denitration catalyst of the coal-fired boiler requires that the flue gas temperature is 300-420 ℃, and a series of problems that the flue gas SCR denitration cannot react or the catalyst fails, is blocked and the like can be caused outside the temperature range.
And the flue gas temperature at the SCR inlet of the coal-fired power plant is lower than the temperature required by the catalyst under the condition of low load, and the low-load flue gas temperature is generally increased by adopting a bypass heating method, so that the full-load investment of denitration is ensured.
The normal bypass heating directly opens a hole on an SCR inlet flue, and the bypass flue gas and the main flue gas are not uniformly mixed, so that the SCR denitration temperature deviation is large, in addition, because the flue gas differential pressure between an extraction point and an injection point is not high, the high-temperature flue gas volume extracted by the bypass is low, the temperature rise is insufficient, a baffle door needs to be added on the main flue, the investment cost is increased, and the flue resistance is also increased. And the existing ammonia spraying grids all require that the pressure of ammonia-containing air entering the ammonia spraying grids is more than 4kpa, the ammonia spraying grids have large resistance, the energy consumption is increased, and the like.
Therefore, there is a need to develop a uniform injection system for denitration bypass temperature rise or SCR denitration ammonia injection, which can provide an injection device with increased injection position negative pressure, large bypass extraction flue gas amount, uniform mixing of bypass flue gas and main flue gas, and small resistance.
The information disclosed in this background section of the invention is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information constitutes prior art already known to a person skilled in the art.
SUMMERY OF THE UTILITY MODEL
Problem to prior art exists, the utility model provides an even injection system that is used for denitration bypass to heat up or SCR denitration to spout ammonia, it forms venturi structure through spraying between the unit, can increase injection position negative pressure, and the flue gas volume is drawn forth to the increase bypass, through a plurality of jets that the symmetry set up, makes bypass flue gas and main road flue gas misce bene, reduces the resistance.
In order to achieve the above purpose, the utility model adopts the following technical scheme: the utility model provides a uniform injection system that is used for denitration bypass intensification or SCR denitration to spout ammonia, includes bypass flue and sets up bypass flue damper on the bypass flue, its characterized in that, uniform injection system still includes:
the injection device is communicated with the bypass flue and is arranged at an inlet flue of the SCR reactor;
the spraying device comprises a plurality of spraying units, the spraying units are hollow and three-dimensional, the width of two ends of the transverse section of each spraying unit is smaller than the width of the middle of each spraying unit, the spraying units are arranged in an aligned mode in the same direction, a Venturi tube structure is formed between every two spraying units, and a plurality of spraying ports are symmetrically arranged on the outer walls of two sides of the widest position of each spraying unit.
Preferably, the bypass flues are respectively communicated with the widest positions of the plurality of the injection units through connecting pipes.
Preferably, the distance between each two of the injection units is the same.
Preferably, the distances between the plurality of the ejection ports are the same.
Preferably, the ejection opening is circular or polygonal.
Preferably, the injection unit is in a hollow octagonal prism shape, and the width of both ends of the transverse section of the injection unit is smaller than the width of the middle.
Preferably, the octagonal prism is subjected to round corner treatment.
Preferably, the spraying unit is a curved solid, and the width of the two ends of the transverse section of the spraying unit is smaller than the width of the middle part of the transverse section of the spraying unit.
Preferably, the SCR reactor is loaded with a catalyst.
The utility model has the advantages that: by forming a Venturi tube structure between the injection units, the negative pressure at the injection position can be increased, and the amount of the flue gas led out by the bypass is increased; through the plurality of symmetrically arranged jet ports, the bypass flue gas and the main path flue gas are uniformly mixed, and the resistance is reduced.
The homogeneous jet system of the present invention has other features and advantages which will be apparent from or are set forth in detail in the accompanying drawings and the following detailed description, which are incorporated herein, and which together serve to explain certain principles of the invention.
Drawings
The above and other objects, features and advantages of the present invention will become more apparent by describing in more detail exemplary embodiments of the present invention with reference to the attached drawings, in which like reference numerals generally represent like parts in exemplary embodiments of the present invention.
Fig. 1 shows a schematic diagram of a homogeneous injection system for denitration bypass warming or SCR denitration ammonia injection according to an exemplary embodiment of the present invention.
Fig. 2 shows a top view of a spray device according to an exemplary embodiment of the present invention.
Fig. 3 shows a front view of a spraying device according to an exemplary embodiment of the present invention.
Fig. 4 shows a perspective view of a spray device according to another exemplary embodiment of the present invention.
Description of reference numerals:
1. a bypass flue; 2. a bypass flue damper; 3. an injection device; 31. an injection unit; 32. an ejection port; 4. an inlet flue; 5. a catalyst; 6. an SCR reactor; 7. and (4) connecting the pipes.
Detailed Description
The invention will be described in more detail below with reference to the accompanying drawings. While the preferred embodiments of the present invention have been illustrated in the accompanying drawings, it is to be understood that the invention may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.
The utility model provides an even injection system that is used for denitration bypass to heat up or SCR denitration to spout ammonia, including bypass flue and the bypass flue governing valve of setting on bypass flue, its characterized in that, even injection system still includes:
the injection device is communicated with the bypass flue and is arranged at an inlet flue of the SCR reactor;
the spraying device comprises a plurality of spraying units, the spraying units are hollow three-dimensional, the width of two ends of the transverse section of each spraying unit is smaller than the width of the middle of each spraying unit, the spraying units are aligned in the same direction, a Venturi tube structure is formed between every two spraying units, and a plurality of spraying ports are symmetrically arranged on the outer walls of two sides of the widest position of each spraying unit.
Wherein, the bypass flue is respectively communicated with the widest positions of the plurality of injection units through connecting pipes.
The injection units are arranged on the inlet flue of the SCR reactor in parallel, and the bypass flue leads high-temperature flue gas from the upper part of the tail flue of the boiler to be injected into the inlet flue of the SCR reactor.
Furthermore, a Venturi tube structure is formed between every two injection units, high-temperature flue gas enters the injection units through the connecting pipes, is sprayed out through the injection ports, flows out through the Venturi tube structure and is mixed with main flue gas in the inlet flue.
And a Venturi tube structure is formed between the over-injection units, so that the negative pressure at the injection position can be increased, and the amount of the smoke led out by the bypass is increased.
Preferably, the distance between each two injection units is the same.
Preferably, the distances between the plurality of ejection ports are the same.
The ejection opening is circular or polygonal, and is more preferably circular.
The same distance interval enables the high-temperature flue gas and the flue gas of the main path to be mixed more uniformly.
The bypass flue gas and the main flue gas are uniformly mixed through a plurality of symmetrically arranged jet ports.
Further, the injection unit is in a hollow octagonal prism shape, and the width of two ends of the transverse section of the injection unit is smaller than the width of the middle of the transverse section of the injection unit.
Wherein, the prism of eight prism shapes is processed with round angle.
The prism department adopts the structure of circular arc, can reduce the resistance of flue gas, improves flue gas circulation speed.
Furthermore, the spraying unit is in a curved three-dimensional shape, and the width of two ends of the transverse section of the spraying unit is smaller than the width of the middle part of the transverse section of the spraying unit.
In the same way, the resistance of the flue gas can be reduced by the curved surface structure, the flue gas circulation speed is improved, and the pressure loss of the ammonia spraying device can be reduced.
Wherein, a catalyst is filled in the SCR reactor.
Specifically, after the boiler is started, the bypass flue adjusting door can be adjusted according to the temperature required by the main path, so that the smoke quantity led out by the bypass flue is enough, and the smoke pressure difference between the leading-out point and the injection point is limited, even if the amount of the flue gas led out by fully opening the adjusting door of the bypass flue cannot meet the requirement, at the moment, in addition, the jetting units in the jetting device are provided with jetting ports at two sides from top to bottom, so that the high-temperature flue gas led out by the bypass flue is uniformly mixed with the flue gas of the main path, the SCR reactor is internally provided with a catalyst, ammonia-containing flue gas passes through the catalyst, and ammonia and nitrogen oxide are subjected to denitration reaction under the action of the catalyst.
Wherein, the utility model discloses an injection apparatus can also be used for the ammonia injection grid, is used in forming the negative pressure in spun position on the ammonia injection grid, just does not need the ammonia flue gas that contains of great pressure, has saved the energy greatly, can also make the mixture of ammonia and flue gas more abundant. Furthermore, it can be used in any place where it is necessary to increase the negative pressure at the ejection location as will occur to those skilled in the art.
Example 1
Fig. 1 shows a schematic diagram of a homogeneous injection system for denitration bypass warming or SCR denitration ammonia injection according to an exemplary embodiment of the present invention. Fig. 2 shows a top view of a spray device according to an exemplary embodiment of the present invention. Fig. 3 shows a front view of a spraying device according to an exemplary embodiment of the present invention.
As shown in fig. 1 to fig. 3, the present embodiment provides a uniform injection system for denitration bypass temperature rise or SCR denitration ammonia injection, which includes a bypass flue 1 and a bypass flue adjusting door 2 disposed on the bypass flue 1, and is characterized in that the uniform injection system further includes:
the injection device 3 is communicated with the bypass flue 1, and the injection device 3 is arranged at an inlet flue 4 of the SCR reactor 6;
the injection device 3 comprises a plurality of injection units 31, each injection unit 31 is hollow and three-dimensional, the width of two ends of the transverse section of each injection unit 31 is smaller than the width of the middle of the corresponding injection unit, the injection units 31 are aligned in the same direction, a Venturi tube structure is formed between every two injection units 31, and a plurality of injection ports 32 are symmetrically arranged on the outer walls of two sides of the widest position of each injection unit 31.
Wherein, the bypass flues 1 are respectively communicated with the widest positions of the plurality of injection units 31 through the connecting pipes 7.
In this embodiment, the injection unit 31 is a hollow octagonal prism, and the width of both ends of the transverse section is smaller than the width of the middle.
Wherein, the prism of eight prism shapes is processed with round angle.
The prism department adopts the structure of circular arc, can reduce the resistance of flue gas, improves flue gas circulation speed.
Wherein, be equipped with catalyst 5 in the SCR reactor, the flue gas that contains ammonia passes through catalyst 5, and ammonia and nitrogen oxide carry out the denitration reaction under the effect of catalyst 5.
In the present embodiment, there are four injection units 31 in the injection device 3, and 7 injection ports 32 are uniformly provided on a single side wall of each injection unit 31.
A venturi tube structure is formed between every two injection units 31, and high-temperature flue gas enters the injection units 31 through the connecting pipe 7, is sprayed out through the injection ports 32, flows out through the venturi tube structure, and is uniformly mixed with the main flue gas in the inlet flue 4.
Example 2
Fig. 4 shows a perspective view of a spray device according to another exemplary embodiment of the present invention.
As shown in fig. 4, the present embodiment is different from embodiment 1 only in the overall shape of the ejection unit 31, and the remaining connection relationship and operation principle are the same as those of embodiment 1.
In this embodiment, the spraying unit 31 is a curved three-dimensional shape, and the width of the two ends of the transverse section is smaller than the width of the middle.
The structure of curved surface can reduce the resistance of flue gas, improves flue gas circulation speed, can also reduce the pressure loss of spouting ammonia device.
In the present embodiment, the injection device 3 includes 5 injection units 31, and 8 injection ports 32 are uniformly provided on a single sidewall of each injection unit 31.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. It will be apparent to those skilled in the art that other variations and modifications of the present invention can be made based on the above description without, or without exhaustive enumeration of all embodiments, and it is intended that all such obvious variations and modifications are within the scope of the invention.
Claims (9)
1. The utility model provides a uniform injection system that is used for denitration bypass intensification or SCR denitration to spout ammonia, includes bypass flue and sets up bypass flue damper on the bypass flue, its characterized in that, uniform injection system still includes:
the injection device is communicated with the bypass flue and is arranged at an inlet flue of the SCR reactor;
the spraying device comprises a plurality of spraying units, the spraying units are hollow and three-dimensional, the width of two ends of the transverse section of each spraying unit is smaller than the width of the middle of each spraying unit, the spraying units are arranged in an aligned mode in the same direction, a Venturi tube structure is formed between every two spraying units, and a plurality of spraying ports are symmetrically arranged on the outer walls of two sides of the widest position of each spraying unit.
2. The homogeneous injection system for denitration bypass heating or SCR denitration ammonia injection of claim 1, wherein the bypass flue is communicated with the widest part of the plurality of injection units through a connecting pipe.
3. The homogeneous injection system for denitration bypass heating or SCR denitration ammonia injection of claim 1, wherein the distance between each two of said injection units is the same.
4. The homogeneous injection system for denitration bypass heating or SCR denitration ammonia injection of claim 1, wherein distances between said plurality of injection ports are the same.
5. The homogeneous injection system for denitration bypass heating or SCR denitration ammonia injection of claim 4, wherein said injection port is circular or polygonal.
6. The homogeneous injection system for denitration bypass heating or SCR denitration ammonia injection according to claim 1, wherein the injection unit is in a hollow octagonal prism shape, and the width of both ends of the transverse section is smaller than the width of the middle.
7. The homogeneous injection system for denitration bypass heating or SCR denitration ammonia injection of claim 6, wherein the octagonal prism-shaped prism is rounded.
8. The system of claim 1, wherein the injection unit is curved and solid, and the width of the two ends of the transverse section of the injection unit is smaller than the width of the middle of the transverse section of the injection unit.
9. The homogeneous injection system for denitration bypass heating or SCR denitration ammonia injection of claim 1, wherein the SCR reactor is filled with a catalyst.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921881086.8U CN211159296U (en) | 2019-11-04 | 2019-11-04 | A even injection system that is used for denitration bypass intensification or SCR denitration to spout ammonia |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921881086.8U CN211159296U (en) | 2019-11-04 | 2019-11-04 | A even injection system that is used for denitration bypass intensification or SCR denitration to spout ammonia |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211159296U true CN211159296U (en) | 2020-08-04 |
Family
ID=71814672
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921881086.8U Active CN211159296U (en) | 2019-11-04 | 2019-11-04 | A even injection system that is used for denitration bypass intensification or SCR denitration to spout ammonia |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211159296U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114682089A (en) * | 2022-04-08 | 2022-07-01 | 西安热工研究院有限公司 | Annular equal-resistance equal-flow ammonia spraying grid with smoke flow self-adaption function |
| CN116036853A (en) * | 2021-10-28 | 2023-05-02 | 中国石油化工股份有限公司 | Flue gas denitration ammonia spraying mixed dust removal equipment and system |
-
2019
- 2019-11-04 CN CN201921881086.8U patent/CN211159296U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116036853A (en) * | 2021-10-28 | 2023-05-02 | 中国石油化工股份有限公司 | Flue gas denitration ammonia spraying mixed dust removal equipment and system |
| CN114682089A (en) * | 2022-04-08 | 2022-07-01 | 西安热工研究院有限公司 | Annular equal-resistance equal-flow ammonia spraying grid with smoke flow self-adaption function |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN201394414Y (en) | Injection ammonia-spray mixing mechanism of SCR reaction device | |
| CN211159296U (en) | A even injection system that is used for denitration bypass intensification or SCR denitration to spout ammonia | |
| CN207694604U (en) | The adjustable full load denitrating system of denitration flue-gas temperature | |
| CN104190252B (en) | A kind of have the multistage pyrolysis coupling flue gas denitrification system that independent SCR mends ammonia spray gun | |
| CN103638805A (en) | SNCR (selective non-catalytic reduction) smoke denitration method of double-reductant CFB (circulating fluidized bed) boiler | |
| CN208493767U (en) | A kind of efficient boiler denitrification apparatus | |
| CN202844862U (en) | Smoke denitration device | |
| CN102166472A (en) | Spiral-flow type ammonia spraying device used for selective catalytic reduction (SCR) denitrification system | |
| CN204656310U (en) | A kind of SNCR-SCR combines flue gas denitrification system | |
| CN109289573B (en) | Gas mixing device and method applied to denitration system | |
| CN203002215U (en) | SCR (Selective Catalytic Reduction) flue gas denitration system for burning lignite | |
| CN202860407U (en) | Full mixing-type ammonia spraying component | |
| CN101879401B (en) | Reducing agent injection mechanism suitable for SCR reactor | |
| CN113144825A (en) | Multi-cycle adsorption tower for industrial tail gas treatment | |
| CN208678772U (en) | A kind of multistage spray efficient SNCR denitration system of ammonia | |
| CN207478284U (en) | A kind of two-stage SNCR denitration system | |
| CN206823552U (en) | A kind of ammonia-spraying grid device | |
| CN215585971U (en) | Spray gun arrangement structure for SNCR (selective non-catalytic reduction) denitration system | |
| CN2892253Y (en) | Flue denitrator setting under boiler coal saver of spraying ammine grid | |
| CN202113779U (en) | Spiral-flow type ammonia spraying device used for SCR (Selective Catalytic Reduction) denitration system | |
| CN207680333U (en) | Urea direct-injection SNCR+SCR flue gas denitrification systems | |
| CN206631410U (en) | A kind of flue gas denitrification system with uniform ammonia-gas spraying device for boiler | |
| CN210128513U (en) | Flue gas spraying heat recovery system of natural gas condensing boiler | |
| CN106178870B (en) | A kind of SNCR-SCR joint flue gas denitrification system | |
| CN210021739U (en) | SCR denitration system for industrial kiln tail gas NOx |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |