CN203886401U - Boiler flue gas denitration system adopting SCR process - Google Patents
Boiler flue gas denitration system adopting SCR process Download PDFInfo
- Publication number
- CN203886401U CN203886401U CN201420249368.7U CN201420249368U CN203886401U CN 203886401 U CN203886401 U CN 203886401U CN 201420249368 U CN201420249368 U CN 201420249368U CN 203886401 U CN203886401 U CN 203886401U
- Authority
- CN
- China
- Prior art keywords
- boiler
- amino material
- flue gas
- amino
- gas denitration
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 57
- 239000003546 flue gas Substances 0.000 title claims abstract description 57
- 238000000034 method Methods 0.000 title claims abstract description 33
- 125000002924 primary amino group Chemical group [H]N([H])* 0.000 claims abstract description 102
- 239000000463 material Substances 0.000 claims abstract description 76
- 239000000243 solution Substances 0.000 claims abstract description 42
- 238000002347 injection Methods 0.000 claims abstract description 38
- 239000007924 injection Substances 0.000 claims abstract description 38
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims abstract description 31
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 claims abstract description 17
- 239000004202 carbamide Substances 0.000 claims abstract description 17
- 238000002360 preparation method Methods 0.000 claims abstract description 13
- 239000000126 substance Substances 0.000 claims description 25
- 229910021529 ammonia Inorganic materials 0.000 claims description 16
- 239000000779 smoke Substances 0.000 claims description 9
- 239000007788 liquid Substances 0.000 claims description 8
- 239000007921 spray Substances 0.000 claims description 8
- 230000005540 biological transmission Effects 0.000 claims description 5
- 238000006243 chemical reaction Methods 0.000 abstract description 5
- 238000000889 atomisation Methods 0.000 abstract description 4
- 230000009172 bursting Effects 0.000 abstract 1
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 15
- GQPLMRYTRLFLPF-UHFFFAOYSA-N Nitrous Oxide Chemical compound [O-][N+]#N GQPLMRYTRLFLPF-UHFFFAOYSA-N 0.000 description 7
- 238000005516 engineering process Methods 0.000 description 5
- 238000010438 heat treatment Methods 0.000 description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- 239000003595 mist Substances 0.000 description 3
- 238000002156 mixing Methods 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 235000011114 ammonium hydroxide Nutrition 0.000 description 2
- 239000003054 catalyst Substances 0.000 description 2
- 238000010531 catalytic reduction reaction Methods 0.000 description 2
- 239000003638 chemical reducing agent Substances 0.000 description 2
- 238000000354 decomposition reaction Methods 0.000 description 2
- 238000009688 liquid atomisation Methods 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 238000000197 pyrolysis Methods 0.000 description 2
- 238000006722 reduction reaction Methods 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- -1 steam Chemical compound 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- Treating Waste Gases (AREA)
Abstract
The utility model discloses a boiler flue gas denitration system adopting an SCR process. The boiler flue gas denitration system comprises an amino material solution preparation system, an amino material solution supply and control device and an amino material injection device, wherein the amino material solution preparation system is positioned outside a boiler, the amino material solution supply and control device is connected with the amino material solution preparation system, and the amino material injection device is positioned in a boiler reversing chamber; an amino material solution atomization device is also arranged outside the boiler and respectively connected with the amino material injection device and the amino material solution supply and control device through amino material conveying pipelines, and the amino material solution atomization device is also connected with an air supply device. The amino material solution atomization device atomizes a urea solution into tiny droplets smaller than 5 micrometer, the tiny droplets are mixed with high-temperature flue gas after being ejected by the amino material injection device, and the heated area of the droplets is increased, so that an amino material solution is pyrolyzed into ammonia gas. Thus, pipe bursting is avoided, and the conversion rate and the use ratio of the amino material solution are improved.
Description
Technical field
The utility model relates to a kind of boiler flue gas denitration system, is specifically related to a kind of boiler flue gas denitration system of the SCR of employing technique, belongs to denitrating flue gas field.
Background technology
Along with expanding economy, nitrogen oxide (NO
x) discharge capacity of pollutant increases sharply, severe contamination ecological environment, become one of key factor of restriction economic development, wherein coal-burning boiler is concentrated, compared with other spread sources, is easily controlled greatly and relatively because of its discharge capacity, becomes and controls nitrogen oxide (NO
x) preferred object.
Selective catalytic reduction (SCR) denitration technology is high with its removal efficiency, and reducing agent consumption is few, adapts to current environmental requirement and obtains that out of stock industry is paid much attention to and application widely.Selective catalytic reduction (SCR) denitration technology refers to that in lower temperature range (300-420 ℃), reducing agent is selectively by the nitrogen oxide (NO in flue gas under the condition of catalyst and oxygen existence
x) the raw nitrogen (N of reduction generation
2) and water (H
2o) reduce the technology of nitrogen oxide (NOx) discharge.Because liquefied ammonia or ammoniacal liquor exist potential safety hazard in defeated and storage process far away, in actual process, be difficult to directly use ammonia, increasing station boiler starts to tend to utilize urea to obtain by pyrolysis Ammonia Process the ammonia that SCR needs.
Chinese patent literature CN202061539U discloses a kind of boiler flue gas denitration system, it comprises the amino substance solution preparation system being positioned at outside boiler, the amino substance solution being positioned at outside boiler being connected with described amino substance solution preparation system is supplied with and control device, and the amino material injector group that is positioned at boiler reversal chamber, between described amino substance solution supply and control device, by amino material solution conveyor tube road, connect, it is in the boiler reversal chamber of 300-700 ℃ that described amino material solution jet group is arranged in flue-gas temperature, from the amino droplets of substance of above-mentioned amino material solution jet group ejection, mix with high-temperature flue gas, be heated and resolve into ammonia, thereby react with nitrogen oxides in effluent.In this boiler flue gas denitration system, just utilize merely amino material solution jet that urea liquid is converted into droplet, its urea liquid drop is still larger, and in boiler, the resolving time is longer, the drop of complete reaction is not sprayed onto on furnace wall or heating surface, can cause booster problem.
Utility model content
For solving in prior art because the urea droplets particle ejecting is larger, in boiler, the resolving time is longer, the drop of complete reaction is not sprayed onto on furnace wall or heating surface, can cause booster problem, and then a kind of boiler flue gas denitration system of the SCR of employing technique is provided.
For this reason, the technical scheme that the utility model is taked is,
A kind of boiler flue gas denitration system that adopts SCR technique, comprise the amino substance solution preparation system being positioned at outside boiler, the amino substance solution being positioned at outside boiler being connected with described amino substance solution preparation system is supplied with and control device, and the amino material ejection device that is positioned at boiler reversal chamber, wherein, described boiler is also provided with amino material liquor atomizer outward, described amino material liquor atomizer supplies with amino substance solution with described amino material ejection device respectively by amino material conveyance conduit and control device is connected, and described amino material liquor atomizer is also connected with air-supply arrangement.
In the boiler flue gas denitration system of above-mentioned employing SCR technique, described amino material liquor atomizer is urea liquid supersonic atomizer.
In the boiler flue gas denitration system of above-mentioned employing SCR technique, it is in the boiler reversal chamber of 350-700 ℃ that described amino material ejection device is arranged at flue-gas temperature, and described amino material ejection device is perpendicular to the center line of described boiler reversal chamber.
In the boiler flue gas denitration system of above-mentioned employing SCR technique, described amino material ejection device comprises sprays supervisor, and the some injection arms with described injection supervisor is connected, are provided with some nozzles on described injection arm.
In the boiler flue gas denitration system of above-mentioned employing SCR technique, the uncovered injection time pipe of described nozzle for being connected with described injection arm.
In the boiler flue gas denitration system of above-mentioned employing SCR technique, described injection arm is responsible for perpendicular to described injection, and described injection time pipe is perpendicular to described injection arm.
In the boiler flue gas denitration system of above-mentioned employing SCR technique, described injection supervisor is vertically set on the left wall of stove and/or the right wall of stove of described boiler reversal chamber.
In the boiler flue gas denitration system of above-mentioned employing SCR technique, on the left wall of stove of described boiler reversal chamber or the right wall of stove, be vertically set up in parallel a plurality of described amino material ejection device.
In the boiler flue gas denitration system of above-mentioned employing SCR technique, be arranged at the Lu Zuobi of described boiler reversal chamber and the described amino material ejection device on the right wall of stove and be arranged symmetrically with along boiler center line.
In the boiler flue gas denitration system of above-mentioned employing SCR technique, flow direction along boiler smoke, on the flue of described amino material ejection device top, be provided with superheater, on the flue of described amino material ejection device below, be provided with successively boiler tail heat transmission equipment, ammonia/flue gas blender, smoke deflector, flow straightening grid and SCR reactor.
In this application after the stokehold of boiler, stove, Lu Zuobi and the right wall of stove be defined as, and leans against steam turbine building, in the face of boiler is stood, left-hand side cry stove left wall, right-hand side cry stove right wall, boiler furnace side is stokehold, after flue side is stove.
Compared with prior art, the utlity model has following advantage:
(1) boiler flue gas denitration system of employing SCR technique of the present utility model, at boiler, be also provided with amino material liquor atomizer outward, it is to be less than the extra small drop of 5 microns by urea liquid atomization outside boiler, extra small drop is sent into boiler internal by conveyance conduit under the blast of air-supply arrangement drives, after amino material ejection device ejection, mix with high-temperature flue gas, increased the heating surface area of drop, making to the full extent amino substance solution pyrolysis is ammonia, not only avoid remaining amino substance solution to be sprayed onto and on furnace wall or heating surface, caused booster problem, conversion ratio and the utilization rate of amino substance solution have also been improved.
(2) boiler flue gas denitration system of employing SCR technique of the present utility model, it is in the boiler reversal chamber of 350-700 ℃ and perpendicular to boiler centerline direction that described amino material ejection device is arranged at flue-gas temperature, suffered flue-gas temperature field is more even, when boiler load changes, contribute to the decomposition of amino material.
(3) boiler flue gas denitration system of employing SCR technique of the present utility model, described amino material ejection device comprises sprays supervisor, the some injection arms that are connected with described injection supervisor, on described injection arm, be provided with some nozzles, this structure can obtain more nozzle, allow the amino of each nozzle ejection can be in the reaction and blending space of design, more large-area covering, makes the ammonia after decomposing evenly mix with the flue gas of boiler.
Accompanying drawing explanation
For content of the present utility model is more likely to be clearly understood, according to specific embodiment of the utility model also by reference to the accompanying drawings, the present invention is further detailed explanation, wherein below
Fig. 1 is wherein a kind of structural representation that adopts the boiler flue gas denitration system of SCR technique of the utility model;
Fig. 2 is a kind of structural representation of amino material ejection device wherein in the utility model.
Wherein, Reference numeral is expressed as,
The amino substance solution of 1-is supplied with and control device, the amino material liquor atomizer of 2-, 3-boiler tail heat transmission equipment, the amino material ejection device of 4-, 41-sprays supervisor, and 42-sprays arm, 43-sprays time pipe, 5-boiler reversal chamber, 6-superheater, 7-ammonia/flue gas blender, 8-smoke deflector, 9-flow straightening grid, 10-SCR reactor, 11-air-supply arrangement, the amino material conveyance conduit of 12-, the amino substance solution preparation system of 13-.
The specific embodiment
A kind of boiler flue gas denitration system that adopts SCR technique as described in Figure 1, comprise the amino substance solution preparation system 13 being positioned at outside boiler, the amino substance solution being positioned at outside boiler being connected with described amino substance solution preparation system 13 is supplied with and control device 1, and the amino material ejection device 4 that is positioned at boiler reversal chamber 5, wherein, described boiler is also provided with amino material liquor atomizer 2 outward, described amino material liquor atomizer 2 supplies with amino substance solution with described amino material ejection device 4 respectively by amino material conveyance conduit 12 and control device 1 is connected, and described amino material liquor atomizer 2 is also connected with air-supply arrangement 11.In the present embodiment, its amino substance solution is urea, described amino material liquor atomizer 2 is urea liquid supersonic atomizer, and it can be the multiple device of realizing solution atomization, JRC-48 type humidifier providing such as Beijing Jiarun Si Jie Science and Technology Ltd. etc.
On the basis of above-mentioned embodiment, it is in the boiler reversal chamber 5 of 350-700 ℃ that described amino material ejection device 4 is arranged at flue-gas temperature, and described amino material ejection device 4 is perpendicular to the center line of described boiler reversal chamber 5.
On the basis of above-mentioned embodiment, as shown in Figure 2, described amino material ejection device 4 comprises sprays supervisor 41, the some injection arms 42 that are connected with described injection supervisor, on described injection arm 42, be provided with some nozzles, it can, for being directly arranged at the opening spraying on arm 42, can be also the uncovered injection time pipe 43 being connected with described injection arm 42.
On the basis of above-mentioned embodiment, described injection arm 42 is perpendicular to described injection supervisor 41, and described injection time pipe 43 is perpendicular to described injection arm 42.
On the basis of above-mentioned embodiment, described injection supervisor 41 is vertically set on the left wall of stove and/or the right wall of stove of described boiler reversal chamber.
On the basis of above-mentioned embodiment, on the left wall of the stove of described boiler reversal chamber or the right wall of stove, be vertically set up in parallel a plurality of described amino material ejection device 4.
On the basis of above-mentioned embodiment, described injection supervisor 41 is vertically set on the Lu Zuobi and the right wall of stove of described boiler reversal chamber, and is arranged at the Lu Zuobi of described boiler reversal chamber and the described amino material ejection device 4 on the right wall of stove is arranged symmetrically with along boiler center line.
On the basis of above-mentioned embodiment, flow direction along boiler smoke, on the flue of described amino material ejection device 4 tops, be provided with superheater 6, on the flue of described amino material ejection device 4 belows, be provided with successively boiler tail heat transmission equipment 3, ammonia/flue gas blender 7, smoke deflector 8, flow straightening grid 9 and SCR reactor 10.
The groundwork step of the utility model boiler flue gas denitration system is, in amino substance solution preparation system 13, urea granules is dissolved into the urea liquid of certain mass concentration, by amino substance solution, supply with and control device 1 is transported to amino material liquor atomizer 2, it is to be less than the extra small drop of 5 microns by urea liquid atomization, by air-supply arrangement 11, the air with urea liquid atomized drop is delivered to the boiler reversal chamber 5 with amino material ejection device 4 through conveyance conduit, then by amino material ejection device 4, spray, boiler smoke flow through that superheater 6 arrives in boiler reversal chambers 5 and with the urea liquid droplets mixing of amino material ejection device ejection, the heat heating urea solution drop of flue gas after mixing, and it is progressively evaporated, decompose, by urea decomposition, be ammonia and carbon dioxide.Subsequently, the mist such as flue gas, steam, ammonia enters boiler tail heat transmission equipment.Described flue gas and the mist of ammonia, pass through successively ammonia/flue gas blender, smoke deflector, flow straightening grid, flue gas and ammonia are mixed more abundant, air-flow more steadily evenly, then enter SCR reactor, mist generates the reduction of nitrogen oxide in flue gas selectively raw nitrogen G&W and reduces discharged nitrous oxides under the effect of SCR reactor the inside catalyst.
Obviously, above-described embodiment is only for example is clearly described, and the not restriction to embodiment.For those of ordinary skill in the field, can also make other changes in different forms on the basis of the above description.Here exhaustive without also giving all embodiments.And the apparent variation of being extended out thus or change are still among the protection domain in the invention.
Claims (10)
1. a boiler flue gas denitration system that adopts SCR technique, comprise the amino substance solution preparation system (13) being positioned at outside boiler, the amino substance solution being positioned at outside boiler being connected with described amino substance solution preparation system (13) is supplied with and control device (1), and the amino material ejection device (4) that is positioned at boiler reversal chamber (5), it is characterized in that
Described boiler is also provided with amino material liquor atomizer (2) outward, described amino material liquor atomizer (2) supplies with amino substance solution with described amino material ejection device (4) respectively by amino material conveyance conduit (12) and control device (1) is connected, and described amino material liquor atomizer (2) is also connected with air-supply arrangement (11).
2. the boiler flue gas denitration system of employing SCR technique according to claim 1, is characterized in that, described amino material liquor atomizer (2) is urea liquid supersonic atomizer.
3. the boiler flue gas denitration system of employing according to claim 1 and 2 SCR technique, it is characterized in that, it is in the boiler reversal chamber (5) of 350-700 ℃ that described amino material ejection device (4) is arranged at flue-gas temperature, and described amino material ejection device (4) is perpendicular to the center line of described boiler reversal chamber (5).
4. the boiler flue gas denitration system of employing according to claim 3 SCR technique, it is characterized in that, described amino material ejection device (4) comprises sprays supervisor (41), some injection arms (42) with described injection supervisor is connected, are provided with some nozzles on described injection arm (42).
5. the boiler flue gas denitration system of employing SCR technique according to claim 4, is characterized in that, the uncovered injection time pipe (43) of described nozzle for being connected with described injection arm (42).
6. the boiler flue gas denitration system of employing according to claim 5 SCR technique, it is characterized in that, described injection arm (42) is responsible for (41) perpendicular to described injection, and described injection time pipe (43) is perpendicular to described injection arm (42).
7. according to the boiler flue gas denitration system of the arbitrary described employing SCR technique of claim 4-6, it is characterized in that, described injection supervisor (41) is vertically set on the left wall of stove and/or the right wall of stove of described boiler reversal chamber.
8. the boiler flue gas denitration system of employing SCR technique according to claim 7, is characterized in that, on the left wall of stove of described boiler reversal chamber or the right wall of stove, is vertically set up in parallel a plurality of described amino material ejection device (4).
9. the boiler flue gas denitration system of employing SCR technique according to claim 8, is characterized in that,
Being arranged at the Lu Zuobi of described boiler reversal chamber and the described amino material ejection device (4) on the right wall of stove is arranged symmetrically with along boiler center line.
10. the boiler flue gas denitration system of employing according to claim 9 SCR technique, it is characterized in that, flow direction along boiler smoke, on the flue of described amino material ejection device (4) top, be provided with superheater (6), on the flue of described amino material ejection device (4) below, be provided with successively boiler tail heat transmission equipment (3), ammonia/flue gas blender (7), smoke deflector (8), flow straightening grid (9) and SCR reactor (10).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420249368.7U CN203886401U (en) | 2014-05-15 | 2014-05-15 | Boiler flue gas denitration system adopting SCR process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420249368.7U CN203886401U (en) | 2014-05-15 | 2014-05-15 | Boiler flue gas denitration system adopting SCR process |
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| Publication Number | Publication Date |
|---|---|
| CN203886401U true CN203886401U (en) | 2014-10-22 |
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| CN201420249368.7U Expired - Lifetime CN203886401U (en) | 2014-05-15 | 2014-05-15 | Boiler flue gas denitration system adopting SCR process |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104548928A (en) * | 2014-12-19 | 2015-04-29 | 北京建筑材料科学研究总院有限公司 | Selective catalytic reduction denitration method and selective catalytic reduction denitration system |
| CN106492634A (en) * | 2016-11-30 | 2017-03-15 | 南京右转信息科技有限公司 | A kind of flue gas desulfurization and denitrification system |
| CN110354677A (en) * | 2019-07-04 | 2019-10-22 | 柳州钢铁股份有限公司 | It is a kind of sintering, pelletizing head flue gas emission purification system |
| CN110465183A (en) * | 2019-08-08 | 2019-11-19 | 华电电力科学研究院有限公司 | A kind of device and its working method preparing micro/nano level alkaline absorbent removing sulfur trioxide in flue gas |
-
2014
- 2014-05-15 CN CN201420249368.7U patent/CN203886401U/en not_active Expired - Lifetime
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104548928A (en) * | 2014-12-19 | 2015-04-29 | 北京建筑材料科学研究总院有限公司 | Selective catalytic reduction denitration method and selective catalytic reduction denitration system |
| CN106492634A (en) * | 2016-11-30 | 2017-03-15 | 南京右转信息科技有限公司 | A kind of flue gas desulfurization and denitrification system |
| CN110354677A (en) * | 2019-07-04 | 2019-10-22 | 柳州钢铁股份有限公司 | It is a kind of sintering, pelletizing head flue gas emission purification system |
| CN110354677B (en) * | 2019-07-04 | 2024-02-27 | 柳州钢铁股份有限公司 | Sintering and pelletizing machine head smoke emission purifying system |
| CN110465183A (en) * | 2019-08-08 | 2019-11-19 | 华电电力科学研究院有限公司 | A kind of device and its working method preparing micro/nano level alkaline absorbent removing sulfur trioxide in flue gas |
| CN110465183B (en) * | 2019-08-08 | 2024-06-04 | 华电电力科学研究院有限公司 | Device for preparing micro-nano alkaline absorbent to remove sulfur trioxide in flue gas and working method of device |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
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Granted publication date: 20141022 |
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| CX01 | Expiry of patent term |