CN203750413U - Medium-and-low temperature flue gas denitration device - Google Patents
Medium-and-low temperature flue gas denitration device Download PDFInfo
- Publication number
- CN203750413U CN203750413U CN201420140155.0U CN201420140155U CN203750413U CN 203750413 U CN203750413 U CN 203750413U CN 201420140155 U CN201420140155 U CN 201420140155U CN 203750413 U CN203750413 U CN 203750413U
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- CN
- China
- Prior art keywords
- ammonia
- flue gas
- catalyst layer
- tower body
- nozzle
- Prior art date
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- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 47
- 239000003546 flue gas Substances 0.000 title claims abstract description 47
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims abstract description 189
- 229910021529 ammonia Inorganic materials 0.000 claims abstract description 87
- 239000003054 catalyst Substances 0.000 claims abstract description 57
- 238000005507 spraying Methods 0.000 claims abstract description 9
- 239000007921 spray Substances 0.000 claims description 39
- 239000007789 gas Substances 0.000 claims description 23
- 239000004071 soot Substances 0.000 claims description 6
- 230000003068 static effect Effects 0.000 claims description 6
- 238000000889 atomisation Methods 0.000 claims description 5
- 230000000694 effects Effects 0.000 claims description 5
- 238000012544 monitoring process Methods 0.000 claims description 5
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 12
- 238000006243 chemical reaction Methods 0.000 description 6
- 239000000203 mixture Substances 0.000 description 5
- 239000003638 chemical reducing agent Substances 0.000 description 4
- 239000003721 gunpowder Substances 0.000 description 4
- 239000002245 particle Substances 0.000 description 4
- 239000000779 smoke Substances 0.000 description 4
- 235000011114 ammonium hydroxide Nutrition 0.000 description 3
- 239000003245 coal Substances 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000006555 catalytic reaction Methods 0.000 description 2
- 238000010531 catalytic reduction reaction Methods 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 230000002441 reversible effect Effects 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004202 carbamide Substances 0.000 description 1
- 238000009841 combustion method Methods 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 231100000252 nontoxic Toxicity 0.000 description 1
- 230000003000 nontoxic effect Effects 0.000 description 1
- QQONPFPTGQHPMA-UHFFFAOYSA-N propylene Natural products CC=C QQONPFPTGQHPMA-UHFFFAOYSA-N 0.000 description 1
- 125000004805 propylene group Chemical group [H]C([H])([H])C([H])([*:1])C([H])([H])[*:2] 0.000 description 1
- 230000002829 reductive effect Effects 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000002912 waste gas Substances 0.000 description 1
Landscapes
- Exhaust Gas Treatment By Means Of Catalyst (AREA)
Abstract
The utility model relates to the field of flue gas denitration, and aims to provide a medium-and-low temperature flue gas denitration device which is high in denitration efficiency. The medium-and-low temperature flue gas denitration device structurally comprises a denitration reactor and a liquid ammonia supply system, wherein the denitration reactor comprises a tower body and a catalyst layer; a flue gas inlet is formed in the upper end of the tower body; a flue gas outlet is formed in the lower end of the tower body; the catalyst layer is arranged in the middle of the tower body; the liquid ammonia supply system comprises a liquid ammonia storage tank, a liquid ammonia pump and a diluter which are communicated in sequence; the diluter is connected with the upper end of the tower body through an ammonia delivery pipe; an ammonia spraying nozzle is arranged at the output end of the ammonia delivery pipe, is arranged on an ammonia spraying grid and is an ultrathin atomizing nozzle; liquid ammonia after passing through the diluter is sprayed from the liquid ammonia storage tank through the ammonia spraying nozzle under the action of the liquid ammonia pump; the liquid ammonia which is sprayed through the ammonia spraying nozzle encounters flue gas, reacts with the flue gas, passes through the catalyst layer and then is discharged from the denitration reactor. The ammonia spraying nozzle is the ultrathin atomizing nozzle, so that the flue gas is in full contact with the ammonia, and the denitration efficiency of the reactor is greatly improved.
Description
Technical field
The utility model relates to denitrating flue gas field, particularly the middle low-temperature denitration of flue gas device of a kind of employing SCR (SCR) mode.
Background technology
China is one and take the country that coal is main energy sources, and coal accounts for 75% in primary energy, wherein more than 84% by combustion method, utilizes, and coal combustion discharges the nitrogen oxide (NO in waste gas
x), be one of main source of atmospheric pollution.Selective catalytic reduction (Selective Catalytic Reduction, SCR) is acknowledged as the mainstream technology of denitrating flue gas, is widely used in each commercial plant.Its cardinal principle is under 280-400 ℃ of temperature conditions, and the reducing agent containing ammonia is sprayed in flue gas, and under the effect of catalyst, reducing agent is selectively the NO in flue gas
xbe reduced to the N of nontoxic pollution-free
2and H
2o, reducing agent can be liquefied ammonia, ammoniacal liquor, urea, hydrocarbon (as methane, propylene etc.) etc.Yet existing SCR equipment for denitrifying flue gas ubiquity reducing agent contacts or undercompounding with flue gas, the problem that reaction efficiency is on the low side.
Utility model content
For solving the problems of the technologies described above, it is a kind of simple in structure that the utility model provides, and has the middle low-temperature denitration of flue gas device of efficient and stable denitration efficiency.
Low-temperature denitration of flue gas device in the utility model, comprise Benitration reactor and liquefied ammonia supply system, described Benitration reactor comprises tower body and catalyst layer, the upper end of described tower body is provided with gas approach, the lower end of described tower body is provided with exhanst gas outlet, described catalyst layer is arranged on the middle part of tower body, the top of described catalyst layer is provided with spray ammonia grid, described liquefied ammonia supply system comprises the liquid ammonia storage tank being communicated with successively, ammonia pump and diluter, described diluter is connected with the upper end of tower body by defeated ammonia pipe, the output of described defeated ammonia pipe is provided with spray ammonia nozzle, described spray ammonia nozzle is arranged on spray ammonia grid, described spray ammonia nozzle is ultra-fine atomization spray nozzle, liquefied ammonia enters tower body by liquid ammonia storage tank by diluter and sprays via spray ammonia nozzle under the effect of ammonia pump, liquefied ammonia spraying by the ejection of spray ammonia nozzle is met and after catalyst layer reacts, is discharged Benitration reactor again on spray ammonia grid with flue gas.
Further, between each layer of catalyst of the gas approach of described Benitration reactor, exhanst gas outlet and catalyst layer, thermal resistance temperature sensor and pressure transmitter are all installed, described thermal resistance temperature sensor and pressure transmitter are for monitoring the variation of temperature and pressure in Benitration reactor.
Further, the arrival end of described gas approach is provided with current equalizer.
Further, the middle part of described defeated ammonia pipe is provided with for controlling the flow control valve of liquefied ammonia flow.
Further, the outside of described spray ammonia nozzle is provided with static mixer.
Further, the number of plies of described catalyst layer is 3, and wherein one deck is reserved layer, and described reserved layer is arranged on top layer or the bottom of catalyst layer.
Further, the described catalyst layer structure that is formed in one.
Further, be equipped with protection grid and soot blower on every layer of described catalyst layer.
Compared with prior art, the beneficial effects of the utility model are: spray ammonia nozzle is ultra-fine atomization spray nozzle, the droplet that ammonia spirit can be atomized into below 20 μ m is injected in flue, fine ammoniacal liquor drop flashes to ammonia at once, flue gas is fully contacted with ammonia, greatly improve the conversion ratio of nitrogen oxides in effluent; Thermal resistance temperature sensor and pressure transmitter change for the temperature and pressure of monitoring in Benitration reactor, guarantee its efficient stable operation; Current equalizer can prevent that nozzle place flue gas from producing eddy current, and the ammonia spraying into is evenly distributed in flue gas; Flow control valve can be controlled the consumption of liquefied ammonia, reduces the waste of liquefied ammonia; The flow-disturbing of static mixer makes flue gas mix with ammonia; Layer is reserved in being provided with of catalyst agent layer, can to it, make adjustment according to the efficiency of reaction condition and catalyst; The catalyst layer structure that is formed in one, facilitates I&M; Protection grid and soot blower, can prevent that finely ground particles is deposited in catalyst micropore.
Accompanying drawing explanation
Fig. 1 is the structural representation of low-temperature denitration of flue gas device in the utility model.
1, current equalizer; 2, spray ammonia grid; 3, catalyst layer; 4, flow control valve; 5, diluter; 6, ammonia pump; 7, liquid ammonia storage tank; 8, tower body; 9, gas approach; 10, exhanst gas outlet; 11, Benitration reactor; 12, liquefied ammonia supply system; 13, pressure transmitter; 14, thermal resistance temperature sensor; 15, static mixer; 16, soot blower; 17, spray ammonia nozzle.
The specific embodiment
Below in conjunction with drawings and Examples, the utility model is further illustrated.
Shown in Figure 1, middle low-temperature denitration of flue gas device, comprise Benitration reactor 11 and liquefied ammonia supply system 12, Benitration reactor 11 comprises tower body 8 and catalyst layer 3, the upper end of tower body 8 is provided with gas approach 9, and the lower end of tower body 8 is provided with exhanst gas outlet 10, and the arrival end of gas approach 9 is provided with current equalizer 1, catalyst layer 3 is arranged on the middle part of tower body 8, and the top of catalyst layer 3 is provided with spray ammonia grid 2.Liquefied ammonia supply system 12 comprises liquid ammonia storage tank 7, ammonia pump 6 and the diluter 5 being communicated with successively, diluter 5 is communicated with tower body 8 by flow control valve 4, and diluter 5 is provided with spray ammonia nozzle 17 with the upper end connectivity part of tower body 8, spray ammonia nozzle 17 is arranged on spray ammonia grid 2, spray ammonia nozzle 17 is ultra-fine atomization spray nozzle, spray ammonia nozzle 17 can spray the liquefied ammonia reverse with flue gas, and liquefied ammonia is uniformly distributed in flue gas.
The catalyst layer 3 of Benitration reactor 11 structure that is formed in one, the number of plies of catalyst layer 3 is taked " 2+1 " arrangement mode, and one deck is wherein the reserved reserved layer that installs catalyst additional, and reserved layer is arranged on top layer or the bottom of catalyst layer 3; Catalyst layer 3 is taked modularization setting, catalyst module adopts honeycomb type can effectively increase the flow velocity that contacts and control simultaneously flue gas of flue gas and liquefied ammonia, preventing that flue gas flow rate is too low results in blockage to catalyst layer 3, or the too high catalytic reaction that causes of flue gas flow rate is not thorough, and then improve the denitration efficiency of reactor to flue gas; Catalyst module in catalyst layer 3 adopts steel structure frame, is convenient to transportation, installs, lifts by crane.The top layer of catalyst layer 3 is taked the reinforcement measure of hardening, and can prevent the erosive wear of catalyst layer 3.Every layer of catalyst of catalyst layer 3 is provided with protective grille, and protective grille can stop the adhesion dust that particle diameter is little and enter catalyst.Catalyst layer 3 is provided with the soot blower 16 regularly catalyst being purged, thereby prevents that finely ground particles is deposited in catalyst micropore.
Thermal resistance temperature sensor 14 and pressure transmitter 13 are all installed between each layer of catalyst of the gas approach 9 of Benitration reactor 11, exhanst gas outlet 10 and catalyst layer 3, and described thermal resistance temperature sensor and pressure transmitter are for monitoring the variation of temperature and pressure in Benitration reactor.
Technological process of the present utility model is: containing smoke of gunpowder gas, by gas approach 9, through current equalizer 1, enter Benitration reactor 11, simultaneously, liquefied ammonia enters tower body 8 by liquid ammonia storage tank 7 by diluter 5 and flow control valve 4 and sprays via spray ammonia nozzle under the effect of ammonia pump 6, liquefied ammonia tentatively mixes with the reverse smoke of gunpowder gas that contains in flue, and both further mix under the flow-disturbing effect of static mixer, then this mixture flows from top to bottom in Benitration reactor 11.Liquefied ammonia enters catalyst layer 3 after mixing completely on spray ammonia grid 2 with containing smoke of gunpowder gas mixture, and under the catalysis of catalyst, liquefied ammonia reacts with the nitrogen oxide containing in smoke of gunpowder gas, and reaction afterproduct is discharged Benitration reactor 11 by exhanst gas outlet 10.
Low-temperature denitration of flue gas device in the utility model, spray ammonia nozzle is ultra-fine atomization spray nozzle, the droplet that ammonia spirit can be atomized into below 20 μ m is injected in flue, fine ammoniacal liquor drop flashes to ammonia at once, flue gas is fully contacted with ammonia, greatly improve the conversion ratio of nitrogen oxides in effluent; Thermal resistance temperature sensor and pressure transmitter change for the temperature and pressure of monitoring in Benitration reactor, guarantee its efficient stable operation; Flow control valve can be controlled the consumption of liquefied ammonia, reduces the waste of liquefied ammonia; The flow-disturbing of static mixer makes flue gas mix with ammonia; Current equalizer can prevent that nozzle place flue gas from producing eddy current, and the ammonia spraying into is evenly distributed in flue gas; Layer is reserved in being provided with of catalyst agent layer, can to it, make adjustment according to the efficiency of reaction condition and catalyst; The catalyst layer structure that is formed in one, facilitates I&M; Protection grid and soot blower, can prevent that finely ground particles is deposited in catalyst micropore.
Comprise the above; it is only the specific embodiment of the present utility model; but protection domain of the present utility model is not limited to this; anyly be familiar with those skilled in the art in the technical scope that the utility model discloses; can expect easily changing or replacing, within all should being encompassed in protection domain of the present utility model.
Claims (8)
1. low-temperature denitration of flue gas device in, comprise Benitration reactor and liquefied ammonia supply system, it is characterized in that, described Benitration reactor comprises tower body and catalyst layer, the upper end of described tower body is provided with gas approach, the lower end of described tower body is provided with exhanst gas outlet, described catalyst layer is arranged on the middle part of tower body, the top of described catalyst layer is provided with spray ammonia grid, described liquefied ammonia supply system comprises the liquid ammonia storage tank being communicated with successively, ammonia pump and diluter, described diluter is connected with the upper end of tower body by defeated ammonia pipe, the output of described defeated ammonia pipe is provided with spray ammonia nozzle, described spray ammonia nozzle is arranged on spray ammonia grid, described spray ammonia nozzle is ultra-fine atomization spray nozzle, liquefied ammonia enters tower body by liquid ammonia storage tank by diluter and sprays via spray ammonia nozzle under the effect of ammonia pump, liquefied ammonia spraying by the ejection of spray ammonia nozzle is met and after catalyst layer reacts, is discharged Benitration reactor again on spray ammonia grid with flue gas.
2. middle low-temperature denitration of flue gas device as claimed in claim 1, it is characterized in that, between each layer of catalyst of the gas approach of described Benitration reactor, exhanst gas outlet and catalyst layer, thermal resistance temperature sensor and pressure transmitter are all installed, described thermal resistance temperature sensor and pressure transmitter are for monitoring the variation of temperature and pressure in Benitration reactor.
3. middle low-temperature denitration of flue gas device as claimed in claim 2, is characterized in that, the arrival end of described gas approach is provided with current equalizer.
4. middle low-temperature denitration of flue gas device as claimed in claim 1, is characterized in that, the middle part of described defeated ammonia pipe is provided with for controlling the flow control valve of liquefied ammonia flow.
5. middle low-temperature denitration of flue gas device as claimed in claim 1, is characterized in that, the outside of described spray ammonia nozzle is provided with static mixer.
6. middle low-temperature denitration of flue gas device as claimed in claim 1, is characterized in that, the number of plies of described catalyst layer is 3, and wherein one deck is reserved layer, and described reserved layer is arranged on top layer or the bottom of catalyst layer.
7. middle low-temperature denitration of flue gas device as claimed in claim 6, is characterized in that, the described catalyst layer structure that is formed in one.
8. middle low-temperature denitration of flue gas device as claimed in claim 7, is characterized in that, is equipped with protection grid and soot blower on every layer of described catalyst layer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420140155.0U CN203750413U (en) | 2014-03-25 | 2014-03-25 | Medium-and-low temperature flue gas denitration device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420140155.0U CN203750413U (en) | 2014-03-25 | 2014-03-25 | Medium-and-low temperature flue gas denitration device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203750413U true CN203750413U (en) | 2014-08-06 |
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ID=51245723
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420140155.0U Expired - Fee Related CN203750413U (en) | 2014-03-25 | 2014-03-25 | Medium-and-low temperature flue gas denitration device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203750413U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107020012A (en) * | 2016-02-02 | 2017-08-08 | 清华大学 | A kind of organic pollution catalytic degradation system |
| CN112604400A (en) * | 2020-11-30 | 2021-04-06 | 成都达奇环境科技有限公司 | Flue gas purification method and flue gas purification system |
-
2014
- 2014-03-25 CN CN201420140155.0U patent/CN203750413U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107020012A (en) * | 2016-02-02 | 2017-08-08 | 清华大学 | A kind of organic pollution catalytic degradation system |
| CN112604400A (en) * | 2020-11-30 | 2021-04-06 | 成都达奇环境科技有限公司 | Flue gas purification method and flue gas purification system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20161221 Address after: 065000 Langfang province long river high tech Zone, Rong Rong Road, No. 29, No. Patentee after: Langfang Jin Sheng Energy Saving Technology Service Co., Ltd. Address before: 065000 Langfang city of Hebei province Guangyang District No. 146 Xinhua Road Patentee before: Zhao Yinde |
|
| DD01 | Delivery of document by public notice |
Addressee: Langfang Jin Sheng Energy Saving Technology Service Co., Ltd. Document name: Notification of Passing Examination on Formalities |
|
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140806 Termination date: 20200325 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |