CN105289302A - Rotary-cut SCR denitration method and apparatus thereof - Google Patents
Rotary-cut SCR denitration method and apparatus thereof Download PDFInfo
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- CN105289302A CN105289302A CN201510768340.3A CN201510768340A CN105289302A CN 105289302 A CN105289302 A CN 105289302A CN 201510768340 A CN201510768340 A CN 201510768340A CN 105289302 A CN105289302 A CN 105289302A
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Abstract
The invention discloses a rotary-cut atomization SCR denitration method and an apparatus thereof. The apparatus comprises a denitrating tower body and a plate-type catalyst layer arranged along the periphery of the denitrating tower body, and a flue gas channel is formed by the plate-type catalyst layer; a flue gas introduction pipeline is arranged along the circumference tangential direction on a side wall of the bottom of the denitrating tower body; preliminary mixing of the flue gas and ammonia gas injected from an eddy flow atomizing nozzle is carried out in the flue gas introduction pipeline, then a mixture is injected into the flue gas channel along the circumference tangential direction of the denitrating tower body, then meets with the ammonia gas injected from the eddy flow atomizing nozzle of the flue gas channel, because that the ammonia gas in the flue gas channel is injected along the circumference tangential direction, and the flue gas is mixed mutually with the ammonia gas, and the mixture enables spiral rising in the tangent circle mode along the inner circumference of the flue gas channel. According to the apparatus, under prerequisite that high efficiency denitration is ensured, catalyst amount is less, compared with the prior art, a denitrating tower structure is simple, cost is low, denitration efficiency is high, energy consumption is low, ammonia escape is reduced, secondary pollution is avoided, and economic benefit is obviously increased.
Description
Technical field
The present invention relates to denitrating flue gas, particularly relate to a kind of rotary-cutting type SCR denitration method and device thereof.
Background technology
Along with the development of basic industries, the economic develop rapidly of China, but the environmental problem caused due to industrial pollution is also more and more serious.NO
xbe the main source of atmosphere pollution, its a large amount of discharge can cause huge harm to environment.In order to socioeconomic sustainable development and maintain good ecological environment, must strengthen atmosphere pollution NO
xemission control and management.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.The Rational choice of catalyst is the key that this technology improves denitration efficiency, and catalyst structure generally has honeycomb fashion, flat and corrugated plate dst three kinds.Wherein, 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.The denitrating flue gas cleaning equipment of current domestic use, the large and problem that power consumption is high of the floor space that not only there is whole tower apparatus, and also the purification of flue gas is abundant not.
Research shows, denitration device both domestic and external, and 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 object of the invention is to the shortcoming and defect overcoming above-mentioned prior art, a kind of rotary-cutting type SCR denitration method and device thereof are provided.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 present invention is achieved through the following technical solutions:
A kind of rotary-cutting type SCR denitration device, the board-like catalyst layer 9 comprising denitrating tower body and arrange along the inner peripheral surface of denitrating tower body; Board-like catalyst layer 9 forms exhaust gases passes; At the lower sides of denitrating tower body, flue gas is set along denitrating tower body inner periphery tangential direction and passes into pipeline 11; The inner peripheral surface of the inner peripheral surface and board-like catalyst layer 9 that pass into pipeline 11 along flue gas is furnished with multiple vortex atomizing nozzle 8 respectively;
Flue gas first passes at flue gas the ammonia sprayed with vortex atomizing nozzle 8 in pipeline 11 and tentatively mixes, spray in exhaust gases passes along denitrating tower body inner periphery tangential direction again, the ammonia sprayed with the vortex atomizing nozzle 8 in exhaust gases passes meets, because the ammonia in exhaust gases passes sprays along circle of contact direction eddy flow, itself 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 8 connects the ammonia feed system be arranged on outside desulfurizing tower by pipeline.
The described periphery along board-like catalyst layer 9, is intervally distributed with multiple soot blower 7 from bottom to top, and soot blower 7 is attached to the dust stratification on board-like catalyst layer 9 surface for blowing off.
Described flue gas passes into the cross section of pipeline 11 and exhaust gases passes for circular.
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 8 by one with the pipeline of magnetic valve 12; 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 13 for detecting ammonia density; The concentration data of the ammonia that the escaping of ammonia feedback control system 1 detects according to probe 13, controlling the aperture of ammonia feed system and magnetic valve 12, for controlling the straying quatity of vortex atomizing nozzle 8 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 10, and the bottom of dust stratification case 10 is provided with ash-valve.
A kind of rotary-cutting type SCR denitration method is as follows:
Flue gas first passes at flue gas the ammonia sprayed with vortex atomizing nozzle 8 in pipeline 11 and tentatively mixes, spray in exhaust gases passes along denitrating tower body inner periphery tangential direction again, the ammonia sprayed with the vortex atomizing nozzle 8 in exhaust gases passes meets, because the ammonia in exhaust gases passes sprays along circle of contact direction eddy flow, itself 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, board-like catalyst layer 9 is repeatedly tangentially washed away in uphill process, and there is catalytic reduction reaction, increase flue gas, the specific area of ammonia and board-like catalyst layer 9, finally exported by denitrating tower bodies top and discharge, achieve denitrating flue gas.
When probe 13 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 13, control the aperture of ammonia feed system and magnetic valve 12, for controlling the straying quatity of vortex atomizing nozzle 8 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 present invention, relative to prior art, has following advantage and effect:
1, flue gas and NH
3good mixing effect, even flow field, denitration efficiency are high.Adopt the mode from tower side wall tangential direction opening, mix with the ammonia sprayed into, 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 present invention efficiently utilizes the space of denitrating tower, further increases denitration efficiency.
2, the time and space that ammonia mixes with flue gas has been widened.Set up flue gas at the lower sides of denitrating tower body along denitrating tower body inner periphery tangential direction and pass into pipeline, and within it periphery arranges vortex atomizing nozzle, play the effect of pre-spray ammonia, make full use of spray ammonia space and time, guarantee mixing of ammonia and flue gas further.
3, avoid catalyst dust stratification, improve catalyst service efficiency.Board-like catalyst layer is arranged in the catalysis field of eddy flow, gaseous mixture (flue gas and ammonia) is under the effect of board-like catalyst layer surface high-speed rotational, the dust that centrifugation goes out, along the wall of the exhaust gases passes be made up of board-like catalyst layer, tumbles the dust stratification case being arranged in bottom.In addition, for improving dust removing effects further, and being provided with soot blower between board-like catalyst layer, regularly blowing eddy flow centrifugation off and going out and the dust stratification being attached to board-like catalyst layer surface.Efficiently solve the contradiction between flue gas flow rate, dust stratification, contact gear ratio surface area, gaseous mixture is under board-like catalyst layer surface repeatedly high-speed rotational effect, both decreased dust stratification and blocking, alleviated catalyst failure, and made again catalyst service efficiency reach higher level.
4, the escapement ratio of ammonia is reduced.On the one hand because ammonia is along the ejection of circle of contact direction eddy flow, flue gas and ammonia are entrainmented mutually and mixes, and along the inner periphery direction by exhaust gases passes with the mode spiral of the circle of contact, reduce NH in denitrating tower exiting flue gas
3volume fraction, have effectively achieved the NO_x Reduction by Effective of flue gas, reduce NH
3escapement ratio.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.
5, the present invention is under the prerequisite ensureing NO_x Reduction by Effective, and catalyst amount is few, and technological means is simple and easy to do.Compared with prior art not only denitrating tower structure is simple, cheap, and denitration efficiency is high, and energy consumption is low, denitration cost is significantly reduced, significantly improves economic benefit.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention.
Fig. 2 is the lower sides at denitrating tower body in Fig. 1, and the flue gas arranged along denitrating tower body inner periphery tangential direction passes into pipeline structural representation.
Detailed description of the invention
Below in conjunction with specific embodiment, the present invention is more specifically described in detail.
Embodiment
As shown in Figure 1, 2.The invention discloses a kind of rotary-cutting type SCR denitration device, the board-like catalyst layer 9 comprising denitrating tower body and arrange along the inner peripheral surface of denitrating tower body; Board-like catalyst layer 9 forms exhaust gases passes; At the lower sides of denitrating tower body, flue gas is set along denitrating tower body inner periphery tangential direction and passes into pipeline 11; The inner peripheral surface of the inner peripheral surface and board-like catalyst layer 9 that pass into pipeline 11 along flue gas is furnished with multiple vortex atomizing nozzle 8 respectively;
Flue gas first passes at flue gas the ammonia sprayed with vortex atomizing nozzle 8 in pipeline 11 and tentatively mixes, spray in exhaust gases passes along denitrating tower body inner periphery tangential direction again, the ammonia sprayed with the vortex atomizing nozzle 8 in exhaust gases passes meets, because the ammonia in exhaust gases passes sprays along circle of contact direction eddy flow, itself 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 8 connects the ammonia feed system be arranged on outside desulfurizing tower by pipeline.
The described periphery along board-like catalyst layer 9, is intervally distributed with multiple soot blower 7 from bottom to top, and soot blower 7 is attached to the dust stratification on board-like catalyst layer 9 surface for blowing off.Soot blower 7 connects outside high steam or compressed air, is blown off be attached to dust stratification on board-like catalyst layer 9 by high velocity air.Both decreased dust stratification and blocking, alleviated catalyst failure, and made again catalyst service efficiency reach higher level.
Described flue gas passes into the cross section of pipeline 11 and exhaust gases passes for circular.
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 8 by one with the pipeline of magnetic valve 12; 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 13 for detecting ammonia density; The concentration data of the ammonia that the escaping of ammonia feedback control system 1 detects according to probe 13, controlling the aperture of ammonia feed system and magnetic valve 12, for controlling the straying quatity of vortex atomizing nozzle 8 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 10, and the bottom of dust stratification case 10 is provided with ash-valve.
Adopt rotary-cutting type SCR denitration device of the present invention to realize the denitration of flue gas, realize by following steps:
Flue gas first passes at flue gas the ammonia sprayed with vortex atomizing nozzle 8 in pipeline 11 and tentatively mixes, spray in exhaust gases passes along denitrating tower body inner periphery tangential direction again, the ammonia sprayed with the vortex atomizing nozzle 8 in exhaust gases passes meets, because the ammonia in exhaust gases passes sprays along circle of contact direction eddy flow, itself 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, board-like catalyst layer 9 is repeatedly tangentially washed away in uphill process, and there is catalytic reduction reaction, increase flue gas, the specific area of ammonia and board-like catalyst layer 9, finally exported by denitrating tower bodies top and discharge, achieve denitrating flue gas.
In denitrating flue gas process, also comprise a escaping of ammonia FEEDBACK CONTROL step: when probe 13 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 13, control the aperture of ammonia feed system and magnetic valve 12, for controlling the straying quatity of vortex atomizing nozzle 8 pairs of ammonia in real time, make to spray into the ammonia amount in exhaust gases passes and NO
xconcentration and preset value match.
Certainly, the flue gas of denitrating tower of the present invention also can be arranged to enter tower bottom flow from tower top and go out, and now, reply miscellaneous part adjusts accordingly, and as set up cyclone 10 at tower top, probe 13 is arranged on tower bottom outlet position etc. accordingly.
The present invention, except being applicable to cylindrical denitrating tower, also adapts to the tower body of rectangle or other cross sectional shape.
As mentioned above, just the present invention can be realized preferably.
Embodiments of the present invention are not restricted to the described embodiments; other are any do not deviate from Spirit Essence of the present invention and principle under do change, modification, substitute, combine, simplify; all should be the substitute mode of equivalence, be included within protection scope of the present invention.
Claims (7)
1. a rotary-cutting type SCR denitration device, is characterized in that: the board-like catalyst layer (9) comprising denitrating tower body and arrange along the inner peripheral surface of denitrating tower body; Board-like catalyst layer (9) forms exhaust gases passes; At the lower sides of denitrating tower body, flue gas is set along denitrating tower body inner periphery tangential direction and passes into pipeline (11); The inner peripheral surface of the inner peripheral surface and board-like catalyst layer (9) that pass into pipeline (11) along flue gas is furnished with multiple vortex atomizing nozzle (8) respectively;
Flue gas first passes at flue gas the ammonia sprayed with vortex atomizing nozzle (8) in pipeline (11) and tentatively mixes, spray in exhaust gases passes along denitrating tower body inner periphery tangential direction again, the ammonia sprayed with the vortex atomizing nozzle (8) in exhaust gases passes meets, because the ammonia in exhaust gases passes sprays along circle of contact direction eddy flow, itself 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 (8) connects the ammonia feed system be arranged on outside desulfurizing tower by pipeline.
2. rotary-cutting type SCR denitration device according to claim 1, it is characterized in that: the described periphery along board-like catalyst layer (9), be intervally distributed with multiple soot blower (7) from bottom to top, soot blower (7) is attached to the dust stratification on board-like catalyst layer (9) surface for blowing off.
3. rotary-cutting type SCR denitration device according to claim 1, is characterized in that: described flue gas passes into the cross section of pipeline (11) and exhaust gases passes for circular.
4. rotary-cutting type SCR denitration device according to any one of claim 1 to 3, 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 (12) pipeline connect vortex atomizing nozzle (8); 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 (13) for detecting ammonia density; The concentration data of the ammonia that the escaping of ammonia feedback control system (1) detects according to probe (13), control the aperture of ammonia feed system and magnetic valve (12), for controlling vortex atomizing nozzle (8) in real time to the straying quatity of ammonia, make to spray into the ammonia amount in exhaust gases passes and NO
xconcentration matches.
5. rotary-cutting type SCR denitration device according to claim 4, is characterized in that: described denitrating tower body bottom portion is provided with dust stratification case (10), and the bottom of dust stratification case (10) is provided with ash-valve.
6. a rotary-cutting type SCR denitration method, it is characterized in that adopting rotary-cutting type SCR denitration device according to any one of claim 1 to 5 to realize, concrete steps are as follows:
Flue gas first passes at flue gas the ammonia sprayed with vortex atomizing nozzle (8) in pipeline (11) and tentatively mixes, spray in exhaust gases passes along denitrating tower body inner periphery tangential direction again, the ammonia sprayed with the vortex atomizing nozzle (8) in exhaust gases passes meets, because the ammonia in exhaust gases passes sprays along circle of contact direction eddy flow, itself 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, board-like catalyst layer (9) is repeatedly tangentially washed away in uphill process, and there is catalytic reduction reaction, increase flue gas, the specific area of ammonia and board-like catalyst layer (9), finally exported by denitrating tower bodies top and discharge, achieve denitrating flue gas.
7. rotary-cutting type SCR denitration method according to claim 6, is characterized in that: also comprise a escaping of ammonia FEEDBACK CONTROL step:
When pop one's head in (13) detect 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 (13), control the aperture of ammonia feed system and magnetic valve (12), for controlling vortex atomizing nozzle (8) in real time to the straying quatity of ammonia, make to spray into the ammonia amount in exhaust gases passes and NO
xconcentration and preset value match.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112807998A (en) * | 2020-12-28 | 2021-05-18 | 华能江阴燃机热电有限责任公司 | Denitration system of gas power plant |
| CN115779674A (en) * | 2022-11-23 | 2023-03-14 | 北京朝阳环境集团有限公司 | Method for treating waste incineration flue gas |
| CN116764424A (en) * | 2023-08-07 | 2023-09-19 | 江苏凯希盟科技有限公司 | SNCR denitration system capable of improving denitration efficiency |
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| CN103728994A (en) * | 2013-12-30 | 2014-04-16 | 北京工业大学 | Cement plant SCR denitration efficiency monitoring control method |
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| CN101244373A (en) * | 2007-02-14 | 2008-08-20 | 潘小军 | Cross current type absorption reaction device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112807998A (en) * | 2020-12-28 | 2021-05-18 | 华能江阴燃机热电有限责任公司 | Denitration system of gas power plant |
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| CN116764424A (en) * | 2023-08-07 | 2023-09-19 | 江苏凯希盟科技有限公司 | SNCR denitration system capable of improving denitration efficiency |
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