CN101342457A - Flue gas denitrating whirling current mixer and whirling current mixing method - Google Patents
Flue gas denitrating whirling current mixer and whirling current mixing method Download PDFInfo
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- CN101342457A CN101342457A CNA200810304121XA CN200810304121A CN101342457A CN 101342457 A CN101342457 A CN 101342457A CN A200810304121X A CNA200810304121X A CN A200810304121XA CN 200810304121 A CN200810304121 A CN 200810304121A CN 101342457 A CN101342457 A CN 101342457A
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Abstract
The invention relates to an eddy flow mixer for smoke gas denitration and an eddy-mixing method; the mixer comprises a mixing component arranged in a gas flue and a reducing agent nozzle inserted in the gas flue; the lee face of the mixing component is a flat surface and directly faces the spout of the reducing agent nozzle and does not contact with the spout of reducing agent nozzle; the stoss side of the mixing component faces toward the flow direction of a fluid. A denitration system adopting the invention utilizes the eddy flow formed by the smoke gas to evenly mix ammonia of the reducing agent, which makes the deviation of mixing uniformity of NH<3>/NO<x> on various points on the cross-section of the inlet of a first catalyst layer be within plus or minus 5 percent so as to totally achieve perfect mixing of NH<3>/NOx. The eddy flow mixer for smoke gas denitration and the eddy-mixing method are especially suitable for the smoke gas denitration technology by a selective catalytic reduction in a thermal power plant, which introduces the ammonia of the reducing agent into the smoke gas containing nitrogen oxide and mixes evenly.
Description
Technical field
The present invention relates to the device that in a kind of flue-gas denitration process two or more gases mixed and the eddy current mixed method of using this device.
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.
Summary of the invention
In order to address the above problem, the invention provides a kind of denitrating flue gas vortex mixer and eddy current mixed method, improved denitrating flue gas mixed effect and denitration efficiency.
The technical solution adopted for the present invention to solve the technical problems 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 lee side of hybrid element is the plane, and the angle of this lee side and flow of flue gas direction is 10 °～90 °, and over against the spout of reducing agent jet pipe, but the spout with the reducing agent jet pipe does not contact, and the stoss side of hybrid element is towards the flow direction of fluid.
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.
The lee side of above-mentioned hybrid element can be fixed with the demarcation strip of radial distribution.
Above-mentioned hybrid element is resistant to elevated temperatures metal or nonmetallic materials.
The size of above-mentioned hybrid element is no more than 80% of flue cross section size.
One end of above-mentioned 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.
A kind of eddy current mixed method of using above-mentioned denitrating flue gas vortex mixer, it is characterized in that: the hybrid element of denitrating flue gas vortex mixer is inclined in the flue that is communicated with the SCR reactor head, the reducing agent jet pipe is inserted in the flue from walling of flue, make the flow direction of the stoss side of hybrid element towards flue gas, make the spout of the lee side of hybrid element over against the reducing agent jet pipe, and do not contact, 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 at hybrid element, after flue gas entered flue, what be subjected to the hybrid element stoss side stopped the generation disturbance, formed eddy current at the edge of hybrid element, 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.
Above-mentioned hybrid element is inclined in the straight flue or the flue corner.
Characteristics of the present invention and beneficial effect are: adopt denitrating system of the present invention, 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.
Present device 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 present invention 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
The present invention is further described below in conjunction with drawings and Examples.
Fig. 1 is the structural representation of the embodiment of the invention one.
Fig. 2 is the structural representation of the embodiment of the invention two.
Fig. 3 is the distribution schematic diagram of demarcation strip.
Fig. 4 is a schematic diagram of using denitrating flue gas vortex mixer of the present invention.
Fig. 5 is the schematic diagram of a plurality of hybrid elements of A-A section among Fig. 4.
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 the plane, the angle of this lee side and flow of flue gas direction is 10 °～90 °, and spout over against reducing agent jet pipe 7, but the spout with the reducing agent jet pipe does not contact, and the stoss side 5 of hybrid element is towards the flow direction of fluid.
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.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 flue cross section size.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 above-mentioned brace summer 20 both can with the hybrid element center fixation, also can 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 can be fixed with the radial demarcation strip 10 with surperficial 3-n five equilibrium.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 invention 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 denitrating flue gas vortex mixer of the present invention 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.
The design condition of denitrating system is:
Exhaust gas volumn 391.673kg/s;
365 ℃ of flue-gas temperatures;
NOx entrance concentration 400mg/Nm
3
The main design parameters of denitrating system:
Flue gas flow rate 15m/s;
Ammonia jet velocity 10m/s;
6 * φ of hybrid element 150mm;
37 ° of hybrid element disk and horizontal sextant angles;
The ammonia injection of reducing agent mouth of pipe distance circle 800mm of disk center.
Claims (10)
1. 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 the plane, the angle of this lee side and flow of flue gas direction is 10 °～90 °, and spout over against reducing agent jet pipe (7), but the spout with the reducing agent jet pipe does not contact, and the stoss side of hybrid element (5) is towards the flow direction of fluid.
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).
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.
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).
5. according to claim 3 or 4 described denitrating flue gas vortex mixers, it is characterized in that: the lee side of above-mentioned hybrid element (6) is fixed with the demarcation strip (10) of radial distribution.
6. 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.
7. 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.
8. 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.
9. an application rights requires the eddy current mixed method of any denitrating flue gas vortex mixer of 1-8, it is characterized in that: the hybrid element of denitrating flue gas vortex mixer is inclined in the flue (8) that is communicated with SCR reactor (19) top, 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, 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, after flue gas entered flue, what be subjected to hybrid element stoss side (5) stopped the generation disturbance, formed eddy current at the edge of hybrid element, 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.
10. the eddy current mixed method of denitrating flue gas vortex mixer according to claim 9 is characterized in that: above-mentioned hybrid element is inclined in the straight flue (13) or flue turns round, and (12) are located.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA200810304121XA CN101342457A (en) | 2008-08-21 | 2008-08-21 | Flue gas denitrating whirling current mixer and whirling current mixing method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA200810304121XA CN101342457A (en) | 2008-08-21 | 2008-08-21 | Flue gas denitrating whirling current mixer and whirling current mixing method |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102698579A (en) * | 2012-06-01 | 2012-10-03 | 北京国电龙源环保工程有限公司 | Ammonia injection and eddy current mixing device and method of flue gas denitrification system |
| CN102773014A (en) * | 2012-08-17 | 2012-11-14 | 浙江富春江环保热电股份有限公司 | Vortex generating device |
| CN103816801A (en) * | 2014-03-03 | 2014-05-28 | 东南大学 | Eddy-current opposite-impacting type gas mixer arranged in gas passage |
| CN104857841A (en) * | 2015-06-03 | 2015-08-26 | 北京国电龙源环保工程有限公司 | Device and method for removing sulfur trioxide from smoke |
| CN105964161A (en) * | 2016-07-21 | 2016-09-28 | 浙江天地环保科技有限公司 | High-efficiency flow mixer for front flue of SCR denitration device |
| CN107008147A (en) * | 2017-06-09 | 2017-08-04 | 南京电力设备质量性能检验中心 | A kind of ammonia-gas spraying device for SCR denitration system |
| CN113286646A (en) * | 2019-01-11 | 2021-08-20 | 康明斯排放处理公司 | Aftertreatment system with multiple dosing modules |
-
2008
- 2008-08-21 CN CNA200810304121XA patent/CN101342457A/en active Pending
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102698579A (en) * | 2012-06-01 | 2012-10-03 | 北京国电龙源环保工程有限公司 | Ammonia injection and eddy current mixing device and method of flue gas denitrification system |
| CN102773014A (en) * | 2012-08-17 | 2012-11-14 | 浙江富春江环保热电股份有限公司 | Vortex generating device |
| CN103816801A (en) * | 2014-03-03 | 2014-05-28 | 东南大学 | Eddy-current opposite-impacting type gas mixer arranged in gas passage |
| CN103816801B (en) * | 2014-03-03 | 2016-01-06 | 东南大学 | A kind of eddy current opposite-flushing type gas mixer be arranged in gas passage |
| CN104857841A (en) * | 2015-06-03 | 2015-08-26 | 北京国电龙源环保工程有限公司 | Device and method for removing sulfur trioxide from smoke |
| CN105964161A (en) * | 2016-07-21 | 2016-09-28 | 浙江天地环保科技有限公司 | High-efficiency flow mixer for front flue of SCR denitration device |
| CN107008147A (en) * | 2017-06-09 | 2017-08-04 | 南京电力设备质量性能检验中心 | A kind of ammonia-gas spraying device for SCR denitration system |
| CN107008147B (en) * | 2017-06-09 | 2023-01-31 | 国能南京电力试验研究有限公司 | Ammonia spraying device for SCR denitration system |
| CN113286646A (en) * | 2019-01-11 | 2021-08-20 | 康明斯排放处理公司 | Aftertreatment system with multiple dosing modules |
| CN113286646B (en) * | 2019-01-11 | 2023-09-12 | 康明斯排放处理公司 | Aftertreatment system with multiple dosing modules |
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Open date: 20090114 |