CN209771826U - Inlet three-section type SCR reactor - Google Patents
Inlet three-section type SCR reactor Download PDFInfo
- Publication number
- CN209771826U CN209771826U CN201920182307.6U CN201920182307U CN209771826U CN 209771826 U CN209771826 U CN 209771826U CN 201920182307 U CN201920182307 U CN 201920182307U CN 209771826 U CN209771826 U CN 209771826U
- Authority
- CN
- China
- Prior art keywords
- inlet
- rectifier
- section
- stage
- reactor
- 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.)
- Expired - Fee Related
Links
- 239000003054 catalyst Substances 0.000 claims abstract description 26
- 238000000034 method Methods 0.000 claims description 3
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 abstract description 24
- 239000003546 flue gas Substances 0.000 abstract description 24
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 abstract description 10
- 229910021529 ammonia Inorganic materials 0.000 abstract description 5
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 15
- 230000006872 improvement Effects 0.000 description 7
- 239000003245 coal Substances 0.000 description 4
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000001174 ascending effect Effects 0.000 description 1
- 239000002956 ash Substances 0.000 description 1
- 238000010531 catalytic reduction reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 239000010881 fly ash Substances 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Exhaust Gas Treatment By Means Of Catalyst (AREA)
Abstract
The utility model discloses an entry syllogic SCR reactor, this reactor includes: the inlet end of the SCR reactor is connected with the horizontal flue, and the outlet end of the SCR reactor is connected with the rectifier; the inlet of the SCR reactor is divided into three sections, the inlet of the first section is a horizontal straight section, and the inlets of the second section and the third section are inclined sections with downward directions; the height of the rectifier above the horizontal flue is increased along with the length direction of the rectifier to form a plurality of different step surfaces; a catalyst reactor disposed between the rectifier and the reactor outlet. The utility model has the advantages that: make the flue gas evenly distributed on whole reactor cross-section to it is downthehole to get into the catalyst perpendicularly, avoid appearing local high-speed and low-speed district, reduce the wearing and tearing to the catalyst, and then improve the life-span of catalyst, reduce ammonia escape rate, improve entire system's denitration efficiency, guarantee that whole SCR system is stable, high-efficient operation, make the flue gas reach ultralow emission.
Description
Technical Field
The utility model relates to a flue gas denitration technical field particularly, relates to an entry syllogic SCR reactor.
Background
Coal is a main primary energy source in China, nitrogen oxides are main atmospheric pollutants generated after coal is combusted, and the pollution of the nitrogen oxides in China is very serious at present and needs to be treated by a corresponding technical scheme. SCR is a mature main technical means for removing nitrogen oxides. The SCR means that under the action of a catalyst, ammonia sprayed into flue gas reduces nitrogen oxides in the flue gas of a coal-fired power plant into nitrogen and water, so that the pollution of the nitrogen oxides to the environment is avoided, and meanwhile, secondary pollution is not caused. At present, a Selective Catalytic Reduction (SCR) flue gas denitration method has high efficiency and stable performance, is widely applied to domestic and foreign projects, and becomes a mainstream technology for removing nitric oxides from power station flue gas.
the flue gas has uniform flow velocity distribution at the upstream of the catalyst, and is the key for prolonging the service life of the catalyst, reducing the escape rate of ammonia and improving the denitration efficiency of a system. The ash content of coal for power generation in China is generally high, and flue gas is unevenly distributed and the local flow rate is high due to unreasonable design of a reactor in the use process of the SCR catalyst, so that the coal is easily abraded by fly ash, and the performance and the service life of the catalyst are influenced. The conventional triangular reactor is close to the inlet section to generate a low flow velocity zone, and is far away from the inlet section to generate a high flow velocity zone, so that the flow velocity distribution entering the catalyst area is uneven, the denitration efficiency of the catalyst is influenced, the ammonia escape is increased, and the denitration efficiency of the whole system is reduced.
SUMMERY OF THE UTILITY MODEL
In order to solve the problem, an object of the utility model is to provide an entry syllogic SCR reactor makes the flue gas evenly distributed on whole reactor cross-section to it is downthehole to get into the catalyst perpendicularly, reduces the wearing and tearing to the catalyst, improves entire system's denitration efficiency.
The utility model provides an entry syllogic SCR reactor, this reactor includes:
The inlet end of the SCR reactor is connected with the horizontal flue, and the outlet end of the SCR reactor is connected with the rectifier;
The inlet of the SCR reactor is divided into three sections, the inlet of the first section is a horizontal straight section, and the inlet of the second section and the inlet of the third section are inclined sections with downward directions;
The height of the rectifier above the horizontal flue is increased along with the length direction of the rectifier by forming a plurality of different step surfaces;
A catalyst reactor disposed between the rectifier and the reactor outlet.
as a further improvement of the present invention, the horizontal length L of the first inlet1< horizontal length L of the inlet of the second section2< horizontal length L of the third-stage inlet3。
As a further improvement of the present invention, the inclination angle of the second section inlet is larger than that of the third section inlet by β.
As a further improvement of the utility model, the rectifier divide into the three-section, and first section rectifier and second section rectifier are the ascending slope section of direction, and the third section rectifier is the straight section of level.
As a further improvement of the present invention, the horizontal length L of the first stage rectifier4And the horizontal length L of the second stage rectifier5Are all smaller than the horizontal length L of the third section rectifier6。
as a further improvement of the present invention, the end of the first segment of the rectifier is higher than the vertical distance H of the horizontal flue1Is less than the vertical distance H that the tail end of the second section of the rectifier is higher than the horizontal flue2。
As a further improvement of the present invention, the end of the second rectifier is higher than the vertical distance H of the horizontal flue2A vertical height H below the horizontal flue with the rectifier0The sum of (A) is not less than 300 m.
the utility model has the advantages that: the combination of the three-section reactor and the rectifier can guide the flow of the flue gas, so as to avoid a low flow velocity area close to the inlet side of the reaction or a high flow velocity area far away from the inlet side; meanwhile, the flue gas can be uniformly distributed on the cross section of the whole reactor and vertically enters the catalyst hole, so that local high-speed and low-speed areas are avoided, the abrasion to the catalyst is reduced, the service life of the catalyst is prolonged, the ammonia escape rate is reduced, the denitration efficiency of the whole system is improved, the stable and efficient operation of the whole SCR system is ensured, and the flue gas is discharged at ultralow level.
Drawings
Fig. 1 is a schematic structural view of an inlet three-stage SCR reactor according to an embodiment of the present invention;
Fig. 2 is a schematic view of a flow direction of flue gas in an inlet three-stage SCR reactor according to an embodiment of the present invention.
in the figure, the position of the upper end of the main shaft,
1. A horizontal flue; 2. an SCR reactor inlet; 3. a rectifier; 4. a catalyst reactor; 5. and (4) an outlet of the reactor.
Detailed Description
The present invention will be described in further detail below with reference to specific embodiments and with reference to the attached drawings.
As shown in fig. 1, an embodiment of the present invention provides an inlet three-stage SCR reactor, which includes:
The inlet end of the SCR reactor 2 is connected with the horizontal flue 1, and the outlet end of the SCR reactor 2 is connected with the rectifier 3;
The inlet 2 of the SCR reactor is divided into three sections, the inlet of the first section is a horizontal straight section, and the inlets of the second section and the third section are inclined sections with downward directions;
The height of the rectifier 3 above the horizontal flue 1 is increased along with the length direction of the rectifier 3 to form a plurality of different step surfaces;
A catalyst reactor 4 disposed between the rectifier 3 and the reactor outlet 5.
Further, the first stage isHorizontal length L of mouth1< horizontal length L of second stage inlet2< horizontal length L of third stage inlet3。
Further, the inclination angle alpha of the inlet of the second section is larger than the inclination angle beta of the inlet of the third section.
The design is that the flue gas entering the SCR reactor inlet 2 from the horizontal flue 1 is compressed rapidly, the horizontal flow direction of the flue gas is changed instantly, the flow direction is deflected to the direction of the catalyst reactor 4, and therefore alpha is set to be larger than beta. In a specific working condition, a specific numerical value of alpha larger than beta is determined according to specific conditions such as flue gas flow rate, length and height of the SCR reactor inlet 2 and the like.
Further, the rectifier 3 is divided into three sections, the first section rectifier and the second section rectifier are both inclined sections with upward directions, and the third section rectifier is a horizontal straight section.
In this embodiment, the rectifier 3 is provided with three inclined planes with step changes along with the extension of the length thereof, and the selection needs to be determined according to specific conditions such as the flue gas flow rate and the size of the rectifier in a specific working condition, and is not limited to the arrangement of the three inclined planes in this embodiment.
Further, the horizontal length L of the first stage rectifier4And the horizontal length L of the second stage rectifier5Are all smaller than the horizontal length L of the third section rectifier6。
Furthermore, the end of the first segment of the rectifier is higher than the vertical distance H of the horizontal flue 11Is less than the vertical distance H that the tail end of the second section of the rectifier is higher than the horizontal flue 12。
Furthermore, the tail end of the second section of the rectifier is higher than the vertical distance H of the horizontal flue 12Vertical height H below horizontal flue 1 with rectifier 30The sum of (A) is not less than 300 m.
The inlet 2 of the SCR reactor is arranged to be a three-section top, the first section is a straight flue connected with the horizontal flue 1, the second section is an inclined flue inclining downwards, and the third section is also an inclined flue inclining downwards. When the flue gas enters the inlet 2 of the SCR reactor from the horizontal flue 1, the flue gas is subjected to the inclined inlets of the second section and the third sectionCompression was performed with the following. Meanwhile, the rectifier 3 forms a plurality of step-shaped changes of upward inclined planes relative to the horizontal flue 1 along the length direction of the rectifier, so that the flue gas is compressed by the inclined inlet of the SCR reactor inlet 2 and is also compressed by the plurality of inclined planes of the rectifier 3. Therefore, the flue gas turns from the horizontal flue and uniformly enters the whole cross section of the SCR reactor, the generation of a high-speed area and a low-speed area in the SCR reactor is reduced, finally the flue gas vertically enters a catalyst hole in the catalyst reactor 4, the abrasion of the flue gas on the catalyst is reduced, the service life of the catalyst is prolonged, and the reaction efficiency of the catalyst is further improved. Wherein H0、H1、H2、L4And L5The magnitude relation between them satisfies inequality H0/L4＞(H2-H1)/L5。
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. An inlet three-stage SCR reactor, comprising:
The inlet end of the SCR reactor inlet (2) is connected with the horizontal flue (1), and the outlet end of the SCR reactor inlet (2) is connected with the rectifier (3);
The inlet (2) of the SCR reactor is divided into three sections, the inlet of the first section is a horizontal straight section, and the inlets of the second section and the third section are inclined sections with downward directions;
the height of the rectifier (3) above the horizontal flue (1) is increased along with the length direction of the rectifier (3) to form a plurality of different step surfaces;
A catalyst reactor (4) arranged between the rectifier (3) and a reactor outlet (5).
2. The method of claim 1An inlet three-stage SCR reactor, characterized in that the horizontal length L of the first stage inlet1< horizontal length L of the inlet of the second section2< horizontal length L of the third-stage inlet3。
3. The inlet three-stage SCR reactor of claim 1, wherein the second stage inlet has an inclination angle α that is greater than the inclination angle β of the third stage inlet.
4. The inlet three-stage SCR reactor according to claim 1, wherein the rectifier (3) is divided into three stages, the first stage rectifier and the second stage rectifier are both inclined stages with an upward direction, and the third stage rectifier is a horizontal straight stage.
5. The inlet three-stage SCR reactor of claim 4, wherein the horizontal length L of the first stage rectifier4And the horizontal length L of the second stage rectifier5Are all smaller than the horizontal length L of the third section rectifier6。
6. the inlet three-stage SCR reactor according to claim 4, characterized in that the first stage rectifier ends a vertical distance H above the horizontal flue (1)1is less than the vertical distance H that the tail end of the second section of the rectifier is higher than the horizontal flue (1)2。
7. The inlet three-stage SCR reactor according to claim 6, characterized in that the second stage rectifier ends a vertical distance H above the horizontal flue (1)2a vertical height H below the horizontal flue (1) with the rectifier (3)0the sum of (A) is not less than 300 m.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920182307.6U CN209771826U (en) | 2019-02-01 | 2019-02-01 | Inlet three-section type SCR reactor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920182307.6U CN209771826U (en) | 2019-02-01 | 2019-02-01 | Inlet three-section type SCR reactor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209771826U true CN209771826U (en) | 2019-12-13 |
Family
ID=68794618
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920182307.6U Expired - Fee Related CN209771826U (en) | 2019-02-01 | 2019-02-01 | Inlet three-section type SCR reactor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209771826U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109603540A (en) * | 2019-02-01 | 2019-04-12 | 大唐环境产业集团股份有限公司 | A kind of entrance three-stage SCR reactor |
-
2019
- 2019-02-01 CN CN201920182307.6U patent/CN209771826U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109603540A (en) * | 2019-02-01 | 2019-04-12 | 大唐环境产业集团股份有限公司 | A kind of entrance three-stage SCR reactor |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104785020B (en) | A kind of SCR denitrating flue gas pre-dedusting device | |
| CN105214496B (en) | A kind of dedusting and denitrification integrated device | |
| CN103585885B (en) | Low-temperature denitration catalyst module and cement kiln low-temperature selective catalytic reduction denitration system | |
| CN103657411B (en) | Rotational flow mixing device for SCR flue gas denitrification system | |
| CN203501199U (en) | NOx-controlled denitrification device of glass kiln | |
| CN209771826U (en) | Inlet three-section type SCR reactor | |
| CN106345293A (en) | Fume turbulent flow device used in SCR denitrification system | |
| CN206082181U (en) | Flue gas system of flow equalizing of low temperature SCR flue gas denitration reactor | |
| CN201930723U (en) | SCR (Semiconductor Control Rectifier) smoke denitration system with structure for optimizing flow field at upstream of ammonia spraying device | |
| CN109224849A (en) | A kind of trapezoidal SCR reactor assembly equipped with ladder rectifier | |
| CN107029531A (en) | The desulfurization of industrial smoke, dedusting denitrification integral handling process | |
| CN109224850A (en) | One kind making the equally distributed SCR reactor assembly of flue gas | |
| CN206184257U (en) | A flue gas vortex device for SCR deNOx systems | |
| CN202387369U (en) | High-efficiency denitration device for pulverized coal boiler | |
| CN209317443U (en) | A kind of trapezoidal SCR reactor assembly equipped with ladder rectifier | |
| CN108392983B (en) | SCR flue gas denitrification facility with prevent deposition water conservancy diversion effect | |
| CN209317444U (en) | One kind making the equally distributed SCR reactor assembly of flue gas | |
| CN210171219U (en) | Device for preventing SCR denitration catalyst wearing and tearing jam | |
| CN210448375U (en) | Dust removal device of coal economizer | |
| CN203577637U (en) | Low-temperature selective catalytic reduction denitrification system of cement kiln | |
| CN207371350U (en) | A kind of fire coal boiler fume NO_x Reduction by Effective system | |
| CN208115518U (en) | A kind of dual forked type reinforcing mixed flue gas denitrification apparatus | |
| CN112452147A (en) | SCR denitration system internal structure and design method thereof | |
| CN105797554A (en) | Compound efficient energy-saving desulfurization, denitrification and dedusting integrated purifying column | |
| CN109603540A (en) | A kind of entrance three-stage SCR reactor |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20191213 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |