CN201249102Y - Flue-gas denitration vortex mixer - Google Patents
Flue-gas denitration vortex mixer Download PDFInfo
- Publication number
- CN201249102Y CN201249102Y CNU2008203018933U CN200820301893U CN201249102Y CN 201249102 Y CN201249102 Y CN 201249102Y CN U2008203018933 U CNU2008203018933 U CN U2008203018933U CN 200820301893 U CN200820301893 U CN 200820301893U CN 201249102 Y CN201249102 Y CN 201249102Y
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- flue
- hybrid element
- flue gas
- mentioned
- reducing agent
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Abstract
The utility model provides a flue-gas denitration vortex mixer, comprising a sheet-shaped mixing element arranged in a flue and a reducer jet-pipe inserted in the flue; the mixing element is obliquely arranged in the flue and is fixedly connected with a supporting beam and the internal wall of the flue; the back flowing surface of the mixing element is a plane; the angle between the back flowing surface and the flowing direction of the flue gas is ranging from 10 degrees to 90 degrees; the back flowing surface just faces to the nozzle of the reducer jet-pipe and is not contacted with the nozzle of the reducer jet-pipe; and the forward flowing surface 5 of the mixing element faces to the flowing direction of the fluid. After being vertically inserted into the flue, the reducer jet-pipe is bent by a certain angle so that the nozzle right faces to the back flowing surface of the mixing element. The flue-gas denitration vortex mixer utilizes the vortex formed by the flue gas to uniformly mix the reducer ammonia, leads the NH3/NOx to be uniformly mixed at all points of the profile of the first layer of catalyst inlet within the tolerance of plus or minus 5%, leads the NH3/NOx to be sufficiently mixed, and in particularly suitable for selective catalytic reduction (SCR) glue-gas denitration process of power plants.
Description
Technical field
The utility model relates to the device that in a kind of flue-gas denitration process two or more gases is mixed.
Background technology
The main source of nitrogen oxide is a fuel in the atmosphere, and wherein nearly 70% comes from the direct burning of coal.China is to be the country of main energy sources with coal, and thermal power plant's Coal-fired capacity accounts for the over half of coal in China total quantity consumed again.According to statistics, the total emission volumn of China NOx in 2000 is about 1,880 ten thousand tons, and wherein, the thermal power plant nitrogen oxide emission is 4,960,000 tons.Emission level measuring and calculating according to present expects the year two thousand twenty, and the nitrogen oxide of China's thermoelectricity discharging will reach more than 1,000 ten thousand tons.The rising of NOx concentration will make the aerial oxygen voltinism increase, and cause a series of city and regional environment problems such as acid rain, depletion of the ozone layer, photochemical fog, and health and ecological environment are constituted huge threat.Therefore, the coal fired power plant denitrating flue gas is the most important thing of China control NOx discharging.
SCR (SCR) technology is the present industrial a kind of denitration technology that is most widely used, and principle is with NH
3Be reducing agent, select the NOx in the catalytic reducing smoke to be reduced to harmless N
2And H
2O to remove NOx, satisfies strict day by day environmental requirement.Its key reaction is as follows:
4NH
3+4NO+O
2→4N
2+6H
2O (1)
8NH
3+6NO→7N
2+12H
2O (2)
The key of SCR technology is reactor internal reaction thing NH
3Mix with pollutant NOx, otherwise, NH
3With NOx mixing inequality and can cause the SCR systematic function to reduce in flue gas.Ammonia is excessive in some zone, can cause superfluous the escaping of ammonia to go out reactor, causes new environmental pollution, causes the denitration effect variation simultaneously; The ammonia quantity not sufficient that some is regional, the result who then causes NOx not to be reduced.
Traditional grating type ammonia blender, its operation principle is: ammonia-spraying grid is installed on the flue inside of leading to the SCR reactor, is made up of several vertically arranged reducing agent jet pipes and horizontally disposed reducing agent jet pipe, and pipe is provided with some nozzles.Every road reducing agent jet pipe all is provided with adjusting device, allows the coupling that the distribution of NOx is tried one's best in the distribution of the ammonia that sprays into and the flue gas, make the ammonia nitrogen mol ratio distribution as far as possible evenly.
Yet find that through long-time running because that the grating type blender occupies the flue area is very big, so resistance is bigger, the pressure loss of system is bigger.Simultaneously, the spray nozzle clogging phenomenon happens occasionally, and it is inhomogeneous to cause ammonia to mix, and then has a strong impact on denitration efficiency, and system's adjusting is very complicated, often breaks down.
The utility model content
In order to address the above problem, the utility model provides a kind of denitrating flue gas vortex mixer, has improved denitrating flue gas mixed effect and denitration efficiency.
The technical scheme that its technical problem that solves the utility model adopts is:
A kind of denitrating flue gas vortex mixer, comprise the hybrid element that places in the flue and insert the interior reducing agent jet pipe of flue, it is characterized in that: above-mentioned hybrid element is inclined in the flue, fixedly connected with the flue inwall by brace summer, the angle of the lee side of hybrid element and flow of flue gas direction is 10 °～90 °, and the stoss side of hybrid element is towards the flow direction of fluid; Above-mentioned reducing agent jet pipe vertically inserts flue, and at the lee side one lateral bending song of hybrid element, its spout is over against the lee side of hybrid element, and do not contact with the spout of reducing agent jet pipe.
Above-mentioned hybrid element can be sheet hybrid element or taper hybrid element.
The plane of above-mentioned sheet hybrid element can be circle, ellipse or the polygon that adapts to the flue shape of cross section.
Above-mentioned taper hybrid element can be normal cone shape, oblique cone shape, oval taper, equilateral pyramid or inequilateral pyramid, and its facies basialis pyramidis is a lee side, and the cone tip is towards the flow direction of flue gas.
Above-mentioned hybrid element is resistant to elevated temperatures metal or nonmetallic materials.
Above-mentioned hybrid element is no more than 80% of flue cross section size.
One end of brace summer and hybrid element center fixation or pass the hybrid element center and the flue inwall is fixed, the other end of brace summer and flue opposite side inwall are fixed.
The lee side of above-mentioned hybrid element is fixed with the demarcation strip of radial distribution.
Characteristics of the present utility model and beneficial effect are: adopt denitrating system of the present utility model, the eddy current that utilizes flue gas to form evenly mixes reducing agent ammonia, makes NH
3/ NO
xMix deviation in ± 5% at ground floor catalyst inlet section each point, reached NH fully
3The well-mixed purpose of/NOx.
The utility model equipment is simple, controls easyly, and debug time is short.The eddy current that utilizes flue gas to form evenly mixes reducing agent ammonia, and flue gas adaptability is strong, NH
3/ NO
xMixed effect is better.And because reducing agent jet pipe quantity is few, bore is big, can accomplish and not have the operation of obstruction, does not need to be serviced.
The utility model is specially adapted to thermal power plant SCR (SCR) flue-gas denitration process, reducing agent ammonia is introduced contained in the flue gas of nitrogen oxide, and it is mixed.
Description of drawings
Below in conjunction with drawings and Examples the utility model is further specified.
Fig. 1 is the structural representation of the utility model embodiment one.
Fig. 2 is the structural representation of the utility model embodiment two.
Fig. 3 is the distribution schematic diagram of demarcation strip.
Fig. 4 is a schematic diagram of using the utility model denitrating flue gas vortex mixer.
Fig. 5 is the schematic diagram of A among Fig. 4-a plurality of hybrid elements of A section.
Among the figure: 1-flue gas, 2-ammonia, 3-eddy current, 4-sheet hybrid element, 5-stoss side, 6-lee side, 7-reducing agent jet pipe, 8-flue, 9-taper hybrid element, 10-demarcation strip, 11-horizontal flue, 12-flue turn round, 13-vertical gas pass, 14-guide vane, 15-gas approach, 16-converging transition, 17-flow straightening grid, 18-catalyst layer, 19-SCR reactor, 20-brace summer.
The specific embodiment
Embodiment one is referring to shown in Figure 1, this denitrating flue gas vortex mixer, comprise the hybrid element that places in the flue 8 and insert the interior reducing agent jet pipe 7 of flue, it is characterized in that: above-mentioned hybrid element is inclined in the flue, fixedly connected with the flue inwall by brace summer 20, the lee side 6 of hybrid element is 10 °～90 ° with the angle of flow of flue gas direction, and the stoss side 5 of hybrid element is towards the flow direction of fluid; The above-mentioned reducing agent jet pipe 7 vertical flues that insert, at the lee side 6 one lateral bending songs of hybrid element, its spout is over against the lee side of hybrid element, and do not contact with the spout of reducing agent jet pipe.
The plane of above-mentioned sheet hybrid element 4 can be circle, ellipse, rectangle, trapezoidal or other polygon that adapts to the flue shape of cross section.The lee side 6 of hybrid element is fixed with the radial demarcation strip 10 with surperficial 3-n five equilibrium.Hybrid element is the material of carbon steel or other anti-450 ℃ of high temperature.The diameter of hybrid element is no more than 80% of the flue cross section length of side.The distance of the spout of reducing agent jet pipe 7 and hybrid element lee side is no more than the length of two hybrid element diameters.
One end of brace summer 20 and hybrid element center fixation or pass the hybrid element center and the flue inwall is fixed, the other end of brace summer 20 and flue opposite side inwall are fixed.
Embodiment two is referring to shown in Figure 2, different with embodiment one is that the denitrating flue gas vortex mixer adopts taper hybrid element 9, above-mentioned taper hybrid element 9 is normal cone shape, oblique cone shape, oval taper, equilateral pyramid or inequilateral pyramid, its facies basialis pyramidis is a lee side, and the cone tip is towards the flow direction of flue gas 1.
Referring to Fig. 3, the lee side of above-mentioned hybrid element 4 also can be fixed with the demarcation strip 10 of radial distribution.Demarcation strip plays guide functions, and it is more even that air-flow is distributed.
For the hybrid element of regular shape, reducing agent ammonia can be delivered to the center of lee side, and it is centered close to the plane center of gravity.For the hybrid element of non-regular shape, for example the polygon hybrid element of inequilateral triangular pyramid shape, trapezoidal or analogous shape needs to regulate reducing agent jet pipe exit position, as much as possible evenly distributes at the hybrid element lee side so that reach fluid.
In actual engineering, need be according to flue gas flow rate (V), regulate the angle (α) between hybrid element diameter (d) and the flue gas flow direction, and optimize the distance (1) between ammonia jet velocity (V ') and outlet of reducing agent jet pipe and the hybrid element, what guarantee ammonia and flue gas evenly mixes diffusion.
Flue gas flow rate (V) is 5-25m/s, and reducing agent ammonia jet velocity (V ') be 5-25m/s, and remain V〉V '.
Eddy current mixing principle of the present utility model is referring to Fig. 1, shown in Figure 2, in hydrodynamics, in the passage of a fluid streams, add a flat board that becomes low incidence with main flow, in dull and stereotyped stoss side one side, owing to there is superpressure to generate, make streamline drawout to the left and right, at the lee side beyond, streamline attracts owing to decompression and bends in the middle of plate.The result except the center of trailing edge, has the component that points to the plate both sides in stoss side speed, and in lee side speed the component that points to plate central authorities is arranged at plate trailing edge place; Under permanent mobile situation, because the source of the continuity of pressure and all streamlines is common, the speed of discontinuity surface both sides is the same, has only the interruption of velocity attitude.Discontinuity surface has all just been rolled from both side edges, and the result has produced two vortexs, and can see in the whole stroke of plate.
Eddy current itself has been an inhibition to gas flow, if but utilize this principle, increase by a fluid streams at the back side of flat board, equally, this fluid also can form another group eddy current at the dull and stereotyped back side, and like this at the edge of flat board, two strands of eddy current that two fluid streams form will form immixture.
Use the utility model denitrating flue gas vortex mixer and carry out the denitrating technique of eddy current mixing referring to shown in Figure 4, the hybrid element of denitrating flue gas vortex mixer is inclined in the flue 8 that is communicated with SCR reactor 19 tops, reducing agent jet pipe 7 is inserted in the flue from walling of flue, make the flow direction of the stoss side 5 of hybrid element towards flue gas 1, make the spout of the lee side 6 of hybrid element over against reducing agent jet pipe 7, and do not contact, a segment distance above hybrid element, correspondence is provided with reducing agent jet pipe 7, make reducing agent ammonia be ejected into the hybrid element lee side from the spout of reducing agent jet pipe, reducing agent ammonia is from the hybrid element center, be evenly distributed to whole lee side, and diffuse to the hybrid element edge, stoss side 5 at hybrid element, flue gas enters denitrating system by boiler tail through interface, at first pass through horizontal flue 11, flue turns round 12 and vertical gas pass 13, run into hybrid element in the flue corner, what flue gas was subjected to hybrid element stoss side 5 stops the generation disturbance, edge at hybrid element forms eddy current, form pressure reduction at tilting hybrid element two ends, cause the imbalance of both sides eddy current, in the eddy current that forms, catalyst ammonia and flue gas are mixed.Then, mixture enters gas approach 15 after turning to through guide vane 14 again, arrive reactor first catalyst layer 18 downwards through converging transition 16, flow straightening grid 17, SCR reactor 19 is the flue gas type of flow straight down, reactor inlet and exhaust pass turning all can be provided with deflector, and reactor inlet can be installed airflow uniform distribution device.
Referring to Fig. 5, in the large scale flue, a plurality of hybrid elements can be to arrange and put, the corresponding layout of reducing agent jet pipe with hybrid element.A plurality of hybrid elements can be fixed with unified brace summer, also can be fixed in the flue with brace summer respectively.
Claims (8)
- [claim 1] a kind of denitrating flue gas vortex mixer, comprise the hybrid element that places in the flue (8) and insert the interior reducing agent jet pipe (7) of flue, it is characterized in that: above-mentioned hybrid element is inclined in the flue, fixedly connected with the flue inwall by brace summer (20), the lee side of hybrid element (6) is 10 °～90 ° with the angle of flow of flue gas direction, and the stoss side of hybrid element (5) is towards the flow direction of fluid; Above-mentioned reducing agent jet pipe (7) vertically inserts flue, and at lee side (6) the one lateral bending songs of hybrid element, its spout is over against the lee side of hybrid element, and do not contact with the spout of reducing agent jet pipe.
- [claim 2] denitrating flue gas vortex mixer according to claim 1 is characterized in that: above-mentioned hybrid element is sheet hybrid element (4) or taper hybrid element (9).
- [claim 3] denitrating flue gas vortex mixer according to claim 2 is characterized in that: the plane of above-mentioned sheet hybrid element (4) is circle, ellipse or the polygon that adapts to the flue shape of cross section.
- [claim 4] denitrating flue gas vortex mixer according to claim 2, it is characterized in that: above-mentioned taper hybrid element (9) is normal cone shape, oblique cone shape, oval taper, equilateral pyramid or inequilateral pyramid, its facies basialis pyramidis is a lee side, and the cone tip is towards the flow direction of flue gas (1).
- [claim 5] according to claim 3 or 4 described denitrating flue gas vortex mixers, it is characterized in that: above-mentioned hybrid element is resistant to elevated temperatures metal or nonmetallic materials.
- [claim 6] according to claim 3 or 4 described denitrating flue gas vortex mixers, it is characterized in that: above-mentioned hybrid element is no more than 80% of flue cross section size.
- [claim 7] is according to claim 3 or 4 described denitrating flue gas vortex mixers, it is characterized in that: an end of above-mentioned brace summer (20) and hybrid element center fixation or pass the hybrid element center and the flue inwall is fixed, the other end and the flue opposite side inwall of brace summer (20) are fixed.
- [claim 8] is characterized in that according to claim 3 or 4 described denitrating flue gas vortex mixers: the lee side of above-mentioned hybrid element (6) is fixed with the demarcation strip (10) of radial distribution.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008203018933U CN201249102Y (en) | 2008-08-21 | 2008-08-21 | Flue-gas denitration vortex mixer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008203018933U CN201249102Y (en) | 2008-08-21 | 2008-08-21 | Flue-gas denitration vortex mixer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201249102Y true CN201249102Y (en) | 2009-06-03 |
Family
ID=40744773
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2008203018933U Expired - Lifetime CN201249102Y (en) | 2008-08-21 | 2008-08-21 | Flue-gas denitration vortex mixer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201249102Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110833762A (en) * | 2019-11-18 | 2020-02-25 | 南京圣诺热管有限公司 | Industrial furnace SCR denitration ammonia injection mixing device, system and method |
| CN111425874A (en) * | 2020-04-29 | 2020-07-17 | 华能国际电力股份有限公司 | Flue structure for SNCR (selective non-catalytic reduction) denitration of pulverized coal boiler flue gas and heating sludge drying heat conduction oil |
| WO2021218076A1 (en) * | 2020-04-29 | 2021-11-04 | 华能国际电力股份有限公司 | Novel mixer structure suitable for sncr denitration of high-temperature flue gas from pulverized coal boiler |
-
2008
- 2008-08-21 CN CNU2008203018933U patent/CN201249102Y/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110833762A (en) * | 2019-11-18 | 2020-02-25 | 南京圣诺热管有限公司 | Industrial furnace SCR denitration ammonia injection mixing device, system and method |
| CN110833762B (en) * | 2019-11-18 | 2022-03-04 | 南京圣诺热管有限公司 | Industrial furnace SCR denitration ammonia injection mixing device, system and method |
| CN111425874A (en) * | 2020-04-29 | 2020-07-17 | 华能国际电力股份有限公司 | Flue structure for SNCR (selective non-catalytic reduction) denitration of pulverized coal boiler flue gas and heating sludge drying heat conduction oil |
| WO2021218074A1 (en) * | 2020-04-29 | 2021-11-04 | 华能国际电力股份有限公司 | Flue structure for sncr denitrification of flue gas from pulverized coal boiler and heating sludge-drying heat transfer oil |
| WO2021218076A1 (en) * | 2020-04-29 | 2021-11-04 | 华能国际电力股份有限公司 | Novel mixer structure suitable for sncr denitration of high-temperature flue gas from pulverized coal boiler |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| EE01 | Entry into force of recordation of patent licensing contract |
Assignee: Jiangsu Longyuan Catalyst Co., Ltd. Assignor: Guodian Longyuan Environment Protection Engrg. Co., Ltd., Beijing Contract record no.: 2010320000731 Denomination of utility model: Flue gas denitrating whirling current mixer and whirling current mixing method Granted publication date: 20090603 License type: Exclusive License Record date: 20100607 |
|
| CX01 | Expiry of patent term |
Granted publication date: 20090603 |
|
| CX01 | Expiry of patent term |