CN205145985U - Cyclone atomization SCR denitrification facility - Google Patents
Cyclone atomization SCR denitrification facility Download PDFInfo
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- CN205145985U CN205145985U CN201520897103.2U CN201520897103U CN205145985U CN 205145985 U CN205145985 U CN 205145985U CN 201520897103 U CN201520897103 U CN 201520897103U CN 205145985 U CN205145985 U CN 205145985U
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- ammonia
- flue gas
- catalyst
- denitrating tower
- tower body
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Abstract
The utility model discloses a cyclone atomization SCR denitrification facility, the inner circumference who follows the denitrating tower body has set up the plate type catalyst layer, has constituted the flue gas passageway. Be provided with honeycomb formula catalyst in the flue gas passageway, constituted two -stage catalytic reaction district with plate type catalyst. Along the periphery on plate type catalyst layer, the multilayer that distributes from bottom to top along a plurality of swirling -flow atomizing nozzle of circle of contact direction injection. When meeting in the flue gas gets into the flue gas passageway and with edge circle of contact direction whirl spun ammonia, rise along the mode spiral of the interior circumferencial direction by the flue gas passageway with the circle of contact. This method and device have not only been solved the flue gas and have been mixed harmfully with NH3, and the uneven problem in flow field has increased contact specific surface and the time of flue gas with reductant, catalyst moreover, effectively utilizes the space of denitrating tower, improves reaction efficiency, reduces smoke resistance, and the energy consumption is hanged down, has reduced the escape rate of ammonia, makes the denitration cost reduce by a wide margin, is showing and is improving economic benefits.
Description
Technical field
The utility model relates to denitrating flue gas, particularly relates to a kind of swirling flow atomizing SCR denitration device.
Background technology
NO
xbe the main source of atmosphere pollution, its a large amount of discharge can cause huge harm to environment.In order to protection of the environment, need NO
xadminister.Widely used Selective catalytic reduction method (SCR) is that one administers NO from tail gas in the world
xthe effective ways of discharge.
The SCR method of current employing utilizes NH
3as reducing agent under the effect of catalyst by NO
xbe reduced to harmless N
2, thus remove the NO in flue gas
x.Select suitable catalyst to be the core of SCR technology, catalyst structure generally has honeycomb fashion, flat and corrugated plate dst three kinds.Wherein, cellular catalyst has larger geometric proportion surface area, but dust-proof poor with performance of anti-blockage, and drag losses is larger.Flat or corrugated plate dst catalyst has better anti-laying dust and blocking ability than cellular catalyst, but gas-solid contact specific area is little, catalytic reaction ability.
Due to by the impact of gas-solid contact area, in tower body, the Flow Field Distribution of flue gas is uneven, and the limited time of flue gas and reducing agent, catalyst exposure, its catalytic reduction reaction efficiency is low, and extensively there is NH
3the problem such as escape, catalyst blockage, catalyst failure.Not only affect the raising of denitration efficiency, and cause denitration cost up, occur secondary pollution problems.Research and develop efficient SCR method and device is very urgent with necessity.
By known to existing SCR system research, the factor affecting denitration efficiency comprises reaction temperature, the time of staying, the mixture homogeneity of reducing agent and flue gas, reducing agent and NO
xstoichiometric ratio, catalyst performance etc.According to the kinetics principle of SCR catalyst, when reaction temperature and catalyst performance certain, ammonia and NO
xthe denitration efficiency of mixability on SCR technique there is great impact.In traditional denitration device, in order to increase ammonia and NO
xincorporation time, have employed the cross-sectional area of aggrandizement apparatus, reduce flue gas flow rate, increase the method for tower body height or length.The cross-sectional area of aggrandizement apparatus not only causes flow field in tower to present laminar flow regime, decreases the turbulence level of blender, reduces denitration efficiency, and add the deposition of particle in flue gas, make a large amount of dust stratification of catalyst surface, affect the activity of catalyst, increase the escape of ammonia; Increase tower body height or length increase catalyst amount again greatly, increase construction cost and operating cost.
Summary of the invention
The purpose of this utility model is the shortcoming and defect overcoming above-mentioned prior art, provides a kind of swirling flow atomizing SCR denitration device.Both can realize flue gas NO_x Reduction by Effective, solve again the problem of easy dust stratification, catalyst failure and the escaping of ammonia often occurred in prior art.
The utility model is achieved through the following technical solutions:
A kind of swirling flow atomizing SCR denitration device, the board-like catalyst layer 10 comprising denitrating tower body and arrange along the inner peripheral surface of denitrating tower body; Board-like catalyst layer 10 forms exhaust gases passes;
Along the periphery of board-like catalyst layer 10, be distributed with multiple vortex atomizing nozzles 9 that multilayer is sprayed along circle of contact direction from bottom to top; When flue gas to be entered in exhaust gases passes by the bottom of denitrating tower body and meets with the ammonia that vortex atomizing nozzle 9 sprays, because ammonia sprays along circle of contact direction eddy flow, flue gas and ammonia are entrainmented mutually mix, and along the inner periphery direction by exhaust gases passes with the mode spiral of the circle of contact; Each vortex atomizing nozzle 9 connects the ammonia feed system be arranged on outside denitrating tower by pipeline.
Twice cellular catalyst 7 is provided with in described exhaust gases passes; Region between first cellular catalyst and smoke inlet is one-level eddy flow catalytic reaction zone; Region between first cellular catalyst and second cellular catalyst is secondary rotary flow catalytic reaction district.
The top of described cellular catalyst 7 is provided with multiple soot blower 8, and soot blower 8 is attached to the dust stratification on soot blower 8 surface for blowing off.
The smoke inlet place of described denitrating tower body lower part is provided with water conservancy diversion homogenizing plate 11.
Described ammonia feed system comprise liquid ammonia storage tank 6 that pipeline successively connects, for liquefied ammonia is evaporated liquid ammonia evaporator 5, for ammonia is cushioned ammonia dashpot 4, for ammonia/air mixer 3 of mixing ammonia and air and the dilution air 2 for diluting ammonia;
Described ammonia/air mixer 3 connects vortex atomizing nozzle 9 by one with the pipeline of magnetic valve 13; The outside of described denitrating tower body is also provided with a escaping of ammonia feedback control system 1, and the exhanst gas outlet of described denitrating tower bodies top is provided with the probe 14 for detecting ammonia density; The concentration data of the ammonia that the escaping of ammonia feedback control system 1 detects according to probe 14, controlling the aperture of ammonia feed system and magnetic valve 13, for controlling the straying quatity of vortex atomizing nozzle 9 pairs of ammonia in real time, making to spray into the ammonia amount in exhaust gases passes and NO
xconcentration matches.
Described denitrating tower body bottom portion is provided with dust stratification case 12, and the middle part of dust stratification case 12 has the tubaeform through hole passed through for flue gas.
A kind of spiral-flow plate-type SCR denitration method is as follows:
Flue gas is by the water conservancy diversion homogenizing plate 11 of denitrating tower body lower part, enter the one-level eddy flow catalytic reaction zone in exhaust gases passes, when the ammonia that flue gas and vortex atomizing nozzle 9 spray meets, because ammonia is sprayed along circle of contact direction by vortex atomizing nozzle 9 eddy flow, flue gas and ammonia are entrainmented mutually mix, and continue spiral along the inner periphery direction by exhaust gases passes in the mode of the circle of contact, then enter secondary rotary flow catalytic reaction district; Mutually entrainment flue gas and the ammonia of mixing, board-like catalyst layer 10 and cellular catalyst 7 is repeatedly tangentially washed away by the uphill process in one-level eddy flow catalytic reaction zone to secondary rotary flow catalytic reaction district, and there is catalytic reduction reaction, the specific area of flue gas, ammonia and board-like catalyst layer 10 is increased, finally exported by denitrating tower bodies top and discharge, achieve denitrating flue gas.
When probe 14 detects that the concentration of ammonia in flue gas is greater than preset value, the ammonia density data that the escaping of ammonia feedback control system 1 is fed back according to this probe 14, control the aperture of ammonia feed system and magnetic valve 13, for controlling the straying quatity of vortex atomizing nozzle 9 pairs of ammonia in real time, make to spray into the ammonia amount in exhaust gases passes and NO
xconcentration and preset value match.
The utility model, relative to prior art, has following advantage and effect:
1, flue gas and NH
3good mixing effect, even flow field, denitration efficiency are high.Flue gas is by water conservancy diversion homogenizing plate, and eddy flow rises, and entrainments the ammonia sprayed into; Ammonia adopts and sprays into along exhaust gases passes circumferencial direction circle type eddy flow, enhances eddy flow field.The two entrainments mutually, makes flue gas and reducing agent Homogeneous phase mixing, forms a kind of swirling flow atomizing state.This swirling flow atomizing state, compared with the fluidised form that it is traditional, can increase the speed of gaseous mixture at circumferencial direction on the one hand, ensures that flue gas has enough strokes in exhaust gases passes, makes the abundant denitration of flue gas.On the other hand, flue gas spiral and non-rectilinear rise, add the stroke of flue gas in exhaust gases passes and the time of staying, make flow field more even, degree of filling is good, makes the catalytic reduction reaction of flue gas more abundant, time of contact is longer, increase reactant contact gear ratio surface area, the utility model efficiently utilizes the space of denitrating tower, further increases denitration efficiency.In addition, by the rectification of twice cellular catalyst, make whole Flow Field Distribution more even, realize quadric catalysis reaction, further improve denitration efficiency.
2, avoid catalyst blockage, improve catalyst service efficiency.As everyone knows, board-like catalyst and cellular catalyst respectively have pluses and minuses, the utility model arranges board-like catalyst at eddy flow field region (circumferencial direction of exhaust gases passes), cellular catalyst is adopted at the axial direction of exhaust gases passes, the two organically combines layout, mixed flue gas and ammonia under the surperficial high-speed rotational effect of board-like catalyst layer, centrifugation, avoid high dust to bring into, efficiently solve the contradiction between flue gas flow rate, blocking, contact gear ratio surface area.For avoiding the dust stratification of cellular catalyst further, being provided with soot blower at the interlayer of cellular catalyst, regularly blowing dust stratification attached thereto off.Mixed flue gas and ammonia, under catalyst surface repeatedly high-speed rotational effect, had both decreased catalyst dust stratification and blocking, had alleviated catalyst failure, made again catalyst service efficiency reach higher level.
3, the escapement ratio of ammonia is reduced.Have employed one-level eddy flow catalytic reaction zone and secondary rotary flow catalytic reaction district arranged in series form pattern, reduce NH in denitrating tower top exit flue gas
3volume fraction, have effectively achieved the NO_x Reduction by Effective of flue gas, reduce NH
3escapement ratio.On the other hand based on spray ammonia feedback control system, by outlet NH
3concentration Testing, adjust ammonia spraying amount in time, solve in traditional SCR device and spray ammonia real-time tracking Dynamic controlling problem, both ensured denitration efficiency, and again reduced the escapement ratio of ammonia.On the other hand, for optimizing NH further
3escapement ratio, add the escaping of ammonia feedback control system, and be provided with the probe for detecting ammonia density at the exhanst gas outlet of denitrating tower bodies top; Ammonia feedback control system, according to the concentration data of the ammonia detected of popping one's head in, controlling the aperture of ammonia feed system and magnetic valve, for controlling the straying quatity of vortex atomizing nozzle to ammonia in real time, making to spray into the ammonia amount in exhaust gases passes and NO
xconcentration matches.Solve in traditional SCR device and spray ammonia real-time tracking Dynamic controlling problem, both ensured denitration efficiency, and reduce further the escapement ratio of ammonia.
4, denitration cost is reduced.Because mixed flue gas and ammonia are at the repeated action in one-level eddy flow catalytic reaction zone and secondary rotary flow catalytic reaction district, not only realize flue gas NO_x Reduction by Effective, and catalyst amount is few, structural configuration simplifies, cheap, technological means is more simple and easy to do, and energy consumption is low, denitration cost is significantly reduced, significantly improves economic benefit.
Accompanying drawing explanation
Fig. 1 is the utility model structural representation.
Fig. 2 is along exhaust gases passes inner peripheral surface, and the vortex atomizing nozzle along circle of contact direction spray ammonia arranges schematic diagram.
Fig. 3 is cellular catalyst structural representation.
Detailed description of the invention
Below in conjunction with specific embodiment, the utility model is more specifically described in detail.
Embodiment
As shown in Figures 1 to 3.The utility model discloses a kind of swirling flow atomizing SCR denitration device, the board-like catalyst layer 10 comprising denitrating tower body and arrange along the inner peripheral surface of denitrating tower body; Board-like catalyst layer 10 forms exhaust gases passes;
Along the periphery of board-like catalyst layer 10, be distributed with multiple vortex atomizing nozzle 9 in the mode of the circle of contact from bottom to top; When flue gas to be entered in exhaust gases passes by the bottom of denitrating tower body and meets with the ammonia that vortex atomizing nozzle 9 sprays, because ammonia sprays in the mode of eddy flow, flue gas and ammonia are entrainmented mutually mix, and along the inner periphery direction by exhaust gases passes with the mode spiral of the circle of contact; Each vortex atomizing nozzle 9 connects the ammonia feed system be arranged on outside denitrating tower by pipeline.
Twice cellular catalyst 7 is provided with in described exhaust gases passes; Region between first cellular catalyst and smoke inlet is one-level eddy flow catalytic reaction zone; Region between first cellular catalyst and second cellular catalyst is secondary rotary flow catalytic reaction district.Twice cellular catalyst 7 makes ammonia be reacted fully, improves denitration efficiency.
The top of described cellular catalyst 7 is provided with multiple soot blower 8, and soot blower 8 is attached to the dust stratification on soot blower 8 surface for blowing off.Soot blower 8 connects outside high steam or compressed air, is blown off be attached to dust stratification on cellular catalyst 7 by high velocity air.Both decreased dust stratification and blocking, alleviated catalyst failure, and made again catalyst service efficiency reach higher level.
Described denitrating tower body bottom portion is provided with dust stratification case 12, and the middle part of dust stratification case 12 has the tubaeform through hole passed through for flue gas.Dust stratification case 12 for receive by drop down in exhaust gases passes dust stratification.The middle part of dust stratification case 11 has the tubaeform through hole passed through for flue gas.Tubaeform being beneficial to reduces the speed of service of flue gas along exhaust gases passes direction.
The smoke inlet place of described denitrating tower body lower part is provided with water conservancy diversion homogenizing plate 11.
Described ammonia feed system comprise liquid ammonia storage tank 6 that pipeline successively connects, for liquefied ammonia is evaporated liquid ammonia evaporator 5, for ammonia is cushioned ammonia dashpot 4, for ammonia/air mixer 3 of mixing ammonia and air and the dilution air 2 for diluting ammonia; Described ammonia/air mixer 3 connects vortex atomizing nozzle 9 by one with the pipeline of magnetic valve 13; The outside of described denitrating tower body is also provided with a escaping of ammonia feedback control system 1, and the exhanst gas outlet of described denitrating tower bodies top is provided with the probe 14 for detecting ammonia density; The concentration data of the ammonia that the escaping of ammonia feedback control system 1 detects according to probe 14, control the aperture of ammonia feed system and magnetic valve 13, for controlling the straying quatity of vortex atomizing nozzle 9 pairs of ammonia in real time, make to spray into the ammonia amount in exhaust gases passes and (nitrogen oxide) NO
xconcentration matches.
The denitrification process of the utility model spiral-flow plate-type SCR denitration tower, realizes by following method:
Flue gas is by the water conservancy diversion homogenizing plate 11 of denitrating tower body lower part, enter the one-level eddy flow catalytic reaction zone in exhaust gases passes, when the ammonia that flue gas and vortex atomizing nozzle 9 spray meets, because ammonia is sprayed along circle of contact direction by vortex atomizing nozzle 9 eddy flow, flue gas and ammonia are entrainmented mutually mix, and continue spiral along the inner periphery direction by exhaust gases passes in the mode of the circle of contact, then enter secondary rotary flow catalytic reaction district; Mutually entrainment flue gas and the ammonia of mixing, board-like catalyst layer 10 and cellular catalyst 7 is repeatedly tangentially washed away by the uphill process in one-level eddy flow catalytic reaction zone to secondary rotary flow catalytic reaction district, and there is catalytic reduction reaction, the specific area of flue gas, ammonia and board-like catalyst layer 10 is increased, finally exported by denitrating tower bodies top and discharge, achieve denitrating flue gas.
The escaping of ammonia feedback is, when probe 14 detects that the concentration of ammonia in flue gas is greater than preset value, the ammonia density data that the escaping of ammonia feedback control system 1 is fed back according to this probe 14, control the aperture of ammonia feed system and magnetic valve 13, for controlling the straying quatity of vortex atomizing nozzle 9 pairs of ammonia in real time, make to spray into the ammonia amount in exhaust gases passes and NO
xconcentration and preset value match.
The utility model is not only applicable to cylindrical denitrating tower, also adapts to the denitrating tower of rectangle or other cross sectional shape.
As mentioned above, just the utility model can be realized preferably.
Embodiment of the present utility model is not restricted to the described embodiments; other are any do not deviate from Spirit Essence of the present utility model and principle under do change, modification, substitute, combine, simplify; all should be the substitute mode of equivalence, be included within protection domain of the present utility model.
Claims (6)
1. a swirling flow atomizing SCR denitration device, is characterized in that: the board-like catalyst layer (10) comprising denitrating tower body and arrange along the inner peripheral surface of denitrating tower body; Board-like catalyst layer (10) forms exhaust gases passes;
Along the periphery of board-like catalyst layer (10), be distributed with multiple vortex atomizing nozzles (9) that multilayer is sprayed along circle of contact direction from bottom to top; When flue gas to be entered in exhaust gases passes by the bottom of denitrating tower body and meets with the ammonia that vortex atomizing nozzle (9) sprays, because ammonia sprays along circle of contact direction eddy flow, flue gas and ammonia are entrainmented mutually mix, and along the inner periphery direction by exhaust gases passes with the mode spiral of the circle of contact; Each vortex atomizing nozzle (9) connects the ammonia feed system be arranged on outside denitrating tower by pipeline.
2. swirling flow atomizing SCR denitration device according to claim 1, is characterized in that: be provided with twice cellular catalyst (7) in described exhaust gases passes; Region between first cellular catalyst and smoke inlet is one-level eddy flow catalytic reaction zone; Region between first cellular catalyst and second cellular catalyst is secondary rotary flow catalytic reaction district.
3. swirling flow atomizing SCR denitration device according to claim 2, it is characterized in that: the top of described cellular catalyst (7) is provided with multiple soot blower (8), soot blower (8) is attached to the dust stratification on soot blower (8) surface for blowing off.
4. swirling flow atomizing SCR denitration device according to claim 1, is characterized in that: the smoke inlet place of described denitrating tower body lower part is provided with water conservancy diversion homogenizing plate (11).
5. swirling flow atomizing SCR denitration device according to any one of claim 1 to 4, is characterized in that: described ammonia feed system comprise liquid ammonia storage tank (6) that pipeline successively connects, for liquefied ammonia is evaporated liquid ammonia evaporator (5), for ammonia is cushioned ammonia dashpot (4), for ammonia/air mixer (3) of mixing ammonia and air and the dilution air (2) for diluting ammonia;
Described ammonia/air mixer (3) by one with magnetic valve (13) pipeline connect vortex atomizing nozzle (9); The outside of described denitrating tower body is also provided with a escaping of ammonia feedback control system (1), and the exhanst gas outlet of described denitrating tower bodies top is provided with the probe (14) for detecting ammonia density; The concentration data of the ammonia that the escaping of ammonia feedback control system (1) detects according to probe (14), control the aperture of ammonia feed system and magnetic valve (13), for controlling vortex atomizing nozzle (9) in real time to the straying quatity of ammonia, make to spray into the ammonia amount in exhaust gases passes and NO
xconcentration matches.
6. swirling flow atomizing SCR denitration device according to claim 5, is characterized in that: described denitrating tower body bottom portion is provided with dust stratification case (12), and the middle part of dust stratification case (12) has the tubaeform through hole passed through for flue gas.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520897103.2U CN205145985U (en) | 2015-11-11 | 2015-11-11 | Cyclone atomization SCR denitrification facility |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520897103.2U CN205145985U (en) | 2015-11-11 | 2015-11-11 | Cyclone atomization SCR denitrification facility |
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|---|---|
| CN205145985U true CN205145985U (en) | 2016-04-13 |
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|---|---|---|---|
| CN201520897103.2U Expired - Fee Related CN205145985U (en) | 2015-11-11 | 2015-11-11 | Cyclone atomization SCR denitrification facility |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105289303A (en) * | 2015-11-11 | 2016-02-03 | 华南理工大学 | Eddy-flow atomization SCR denitration method and apparatus thereof |
| CN109396114A (en) * | 2018-12-13 | 2019-03-01 | 北京国电龙源环保工程有限公司 | The intelligent cleaning system and its method for cleaning of SCR catalyst surface area ash |
-
2015
- 2015-11-11 CN CN201520897103.2U patent/CN205145985U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105289303A (en) * | 2015-11-11 | 2016-02-03 | 华南理工大学 | Eddy-flow atomization SCR denitration method and apparatus thereof |
| CN109396114A (en) * | 2018-12-13 | 2019-03-01 | 北京国电龙源环保工程有限公司 | The intelligent cleaning system and its method for cleaning of SCR catalyst surface area ash |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160413 Termination date: 20191111 |