CN202860408U - Integral preposed preheating SCR (Selective Catalytic Reduction) denitrating device - Google Patents
Integral preposed preheating SCR (Selective Catalytic Reduction) denitrating device Download PDFInfo
- Publication number
- CN202860408U CN202860408U CN 201220569377 CN201220569377U CN202860408U CN 202860408 U CN202860408 U CN 202860408U CN 201220569377 CN201220569377 CN 201220569377 CN 201220569377 U CN201220569377 U CN 201220569377U CN 202860408 U CN202860408 U CN 202860408U
- Authority
- CN
- China
- Prior art keywords
- gas
- preheating
- scr
- heat exchanger
- preposed
- 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
Images
Landscapes
- Exhaust Gas Treatment By Means Of Catalyst (AREA)
Abstract
The utility model discloses an integral preposed preheating SCR (Selective Catalytic Reduction) denitrating device which comprises a gas-gas heat exchanger, a heater, an ammonia injector, a static mixer and a SCR catalytic reactor which are connected head-to-tail. The device further comprises a preposed preheater, wherein an exhaust gas inlet is formed in one end of the preposed preheater, and an exhaust gas outlet is formed in the other end of the preposed preheater; a hot wind inlet which is communicated with a hot wind conveying source is formed in the top of the preposed preheater, and the exhaust gas outlet is communicated with the gas-gas heat exchanger. The preposed preheater is internally provided with a static mixing area which is a circular tube; and the circular tube is internally provided with a plurality of quadrangular star-like discs. The device not only has more than 80% of denitration function, but also further effectively prevents the SCR denitrating device corrosion caused by moisture condensation generated from water vapor and fogdrop which are entrained in an oxynitride exhaust gas on the inner walls of the pipeline and the gas-gas heat exchanger, so that, the service life of the denitrating device is greatly prolonged to 8-10 years, and the operating stability and reliability of the SCR denitrating device are guaranteed.
Description
Technical field
The utility model relates to the SCR denitrification apparatus that a kind of nitrous oxides exhaust gas purifies, particularly a kind of integrated preposition preheating SCR denitrification apparatus.
Background technology
The SCR denitrification apparatus becomes the mainstream technology that solves in recent years the nitrous oxides exhaust gas pollution problem.A lot of nitrous oxides exhaust gas through cleaning dust or deacidification technique, not only contain steam and droplet in the waste gas before entering the SCR device, also have a small amount of residual sour corrosion composition, such as HF, SO
XDeng pollutant component, the HF in the nitrous oxides exhaust gas, SO
XBe combined with droplet and form liquid HF, H etc. the steam of corrosivity composition in waste gas
2SO
X, a small amount of NOx in the nitrous oxides exhaust gas also can be combined with droplet with steam and be formed liquid rare nitric acid and nitrous acid in addition, and namely the secondary of nitric acid is synthetic.These HF, H
2SO
X, rare nitric acid and nitrous acid is attached to pipeline and the heat exchanger inwall of denitrification apparatus, and then equipment and pipeline caused corrosion.Particularly HF is the most serious to the corrosion of pipeline and heat exchanger.As long as nitrous oxides exhaust gas contains extremely a small amount of HF, even pipeline and heat exchanger adopt the fabulous 316L stainless steel of corrosion resistance, the normal operation life-span can be above 1 year.At present a lot of SCR denitrification apparatus there is no and overcome HF, H
2SO
3, rare nitric acid and nitrous acid is to reasonable process and the equipment of SCR corrosion of equipment, causes the corrosion of SCR denitrification apparatus cold junction pipeline and heat exchanger extremely serious, service life of equipment is short, fluctuation of service.Therefore, HF, H
2SO
X, rare nitric acid and nitrous acid is a lot of SCR denitrification apparatus problems in the urgent need to address to the control of SCR corrosion of equipment.
After cold junction pipeline and the heat exchanger corrosion, not only want stop production to overhaul, and renewal cost is very high, particularly in a single day corrosion of heat exchanger penetrates, cause the waste gas that purifies through the SCR denitration and directly penetrate in the clean gas after the SCR denitration purifies, cause the discharging can't be up to standard.By improving the hot side outlet temperature of heat exchanger, can cause a large amount of thermal waste, so that SCR denitrification apparatus operating cost is very high.
The utility model content
The technical problems to be solved in the utility model is: there is no and overcome HF, H in order to overcome existing SCR denitrification apparatus
2SO
x, rare nitric acid and nitrous acid is to the SCR corrosion of equipment, cause the corrosion of SCR denitrification apparatus cold junction pipeline and heat exchanger extremely serious, service life of equipment is short, the problems such as fluctuation of service, a kind of integrated preposition preheating SCR denitrification apparatus is provided, improve in maximum the heat exchanger heat exchange efficiency, under the prerequisite of the operating cost of reduction SCR denitrating system, eliminate HF, SO in the nitrous oxides exhaust gas
xDeng in SCR denitrification apparatus dewfall, eliminated the corrosion difficult problem of SCR denitrification apparatus.
The technical scheme that its technical problem that solves the utility model adopts is: a kind of integrated preposition preheating SCR denitrification apparatus, comprise the successively gas-gas heat exchanger of head and the tail connection, heater, the ammonia injector, static mixer and SCR catalytic reactor, also has a front preheating process device, front preheating process device one end is provided with exhaust gas inlet, the other end is provided with waste gas outlet, front preheating process device top has the hot blast import, the hot blast import is communicated with the hot blast delivery source, waste gas outlet is communicated with gas-gas heat exchanger, be provided with the static mixing district in the front preheating process device, the static mixing district is a round tube, the disk of built-in several the four jiaos of stars of round tube.
Described ammonia injector is provided with a hot air reflux mouth.
Described hot blast import outside is provided with preheating fan, and preheating fan is communicated with the hot blast import by a hot air reflux pipe, and is communicated with the hot air reflux mouth by the hot air reflux pipe.
Described preheating fan is the high temperature stainless steel blower fan, and blower fan main shaft has the twice carbon ring seal.The mode that Fan Bearing Box adopts air-cooled+water-cooled to combine is cooled off, and blower fan is imported and exported all stainless steel expansion joint.
Described static mixing Qu Si angle star disk is 30 ° of elevations angle and arranges in round tube take preposition preheater central axis as benchmark.
Described gas-gas heat exchanger is board-like or tubular heat exchanger, and gas-gas heat exchanger is provided with the cold side import, and the waste gas outlet of front preheating process device is communicated with the cold side import.Clean high-temperature flue gas after SCR purifies is walked shell side, walks tube side through the nitrous oxides exhaust gas after the preheating of front preheating process device.
Described static mixer is an asymmetric U-shaped tubular construction, is provided with successively five layers of mixed zone in it, and each mixed zone is comprised of several four jiaos of star disks.
Be filled with multilayer denitrating catalyst layer in the described catalytic reactor, interval 15-25cm between the adjacent two layers.
The beneficial effects of the utility model are: this device not only has the function of the denitration more than 98%, and can also effectively prevent the corrosive substance carried secretly in nitrous oxides exhaust gas dewfall and cause the corrosion of SCR denitrification apparatus in pipeline and gas-gas heat exchanger, greatly prolonged the service life of SCR denitrification apparatus, be 8-10 service life, guaranteed the Stability and dependability of SCR denitrification apparatus operation.
Description of drawings
Fig. 1 is structural representation of the present utility model
Fig. 2 is the structure chart of front preheating process device
Fig. 3 is ammonia emitter construction figure
The structural representation of Fig. 4 static mixer
Fig. 5 is the structure chart of SCR catalytic reactor
The disc structure figure of four jiaos of stars of Fig. 6
The specific embodiment
Now by reference to the accompanying drawings and specific embodiment, the utility model is described in further detail.These accompanying drawings are the schematic diagram of simplification, basic structure of the present utility model only is described in a schematic way, so it only show the formation relevant with the utility model.
Such as Fig. 1, it is the structural representation of integrated preposition preheating SCR denitrification apparatus, comprise the successively gas-gas heat exchanger 2 of head and the tail connection, heater 3, ammonia injector 4, static mixer 5 and SCR catalytic reactor 6, also has front preheating process device 1, preheating fan 7 and hot air reflux pipeline 8, described front preheating process device 1 contains exhaust gas inlet 1.1, waste gas outlet 1.2, hot blast import 1.3, static mixing district 1.4, described gas-gas heat exchanger 2 contains hot side-entrance 2.1, hot side outlet 2.2, cold side import 2.3, cold side exports 2.4 4 flue gas interfaces, the heater import 3.1 of described heater 3 links to each other with gas-gas heat exchanger 2 cold sides outlet 2.4, heater outlet 3.2 links to each other with the ammonia injector import 4.1 of described ammonia injector 4, ammonia injector outlet 4.2 links to each other with the static mixer import 5.1 of described static mixer 5, static mixer outlet 5.2 links to each other with the catalytic reactor import 6.1 of described SCR catalytic reactor 6, catalytic reactor outlet 6.2 links to each other with the hot side-entrance 2.1 of described gas-gas heat exchanger 2, one end of described hot air reflux pipeline 8 links to each other with ammonia injector 4 hot air reflux mouths 4.3, an other end of hot air reflux pipeline 8 links to each other with the hot blast import 1.3 of front preheating process device 1, is provided with preheating fan 7 in the middle of the hot air reflux pipeline and is used in the part high-temperature hot-air feed track front preheating process device 1 in the ammonia injector 4.As shown in Figure 1, connect to form a U-shaped integrated apparatus by above-mentioned.
Such as Fig. 2, it is front preheating process device structural representation, front preheating process device 1 is a gas mixer that is built-in with static mixing district 1.4, the static mixing district is comprised of the disk of several four jiaos of stars, so that nitrous oxides exhaust gas fully mixes with the backflow high-temperature hot-air, the temperature of nitrous oxides exhaust gas is brought up to more than 100 ℃, prevented that steam and the droplet in the waste gas from condensing into water at pipeline and heat exchanger wall.HF, H have so just been eliminated fully
2SO
3, HNO
3Deng the corrosion to ventilation shaft and gas-gas heat exchanger.
Such as Fig. 3, be the structural representation of ammonia injector, it is the pipeline section of a circular configuration that ammonia sprays premixed device, is provided with ammonia (ammonia or urea liquid) spray gun 4.4 before pipeline section.Spray gun sprays ammonia and enters in the flue gas, allows ammonia tentatively mix with nitrous oxides exhaust gas.Be provided with the hot air reflux mouth in the position near ammonia injector import 4.1, the hot blast that is back to the front preheating process device extracts from the hot air reflux mouth.
Such as Fig. 4, be the structural representation of static mixer, static mixer 5 is asymmetric U-shaped tubular constructions, is disposed with four layers of mixed zone in it, described each mixed zone is comprised of the disk 5.3 of several four jiaos of stars, and the structure of four jiaos of star disks is seen Fig. 6.
Such as Fig. 5, be the structure chart of SCR catalytic reactor, be filled with multilayer denitrating catalyst layer 6.3 in the catalytic reactor 6, the distance of interval 15-25cm between each pull-up denox catalyst, be conducive to the quadratic distribution of air-flow between the denitrating catalyst layer, be conducive to improve denitration efficiency.
Front preheating process device static mixing Qu Si angle star disk is 30 ° of elevations angle and arranges in round tube take preposition preheater central axis as benchmark, so that nitrous oxides exhaust gas fully mixes with the backflow high-temperature hot-air, the temperature of nitrous oxides exhaust gas is brought up to more than 100 ℃, prevented that steam and the droplet in the waste gas from condensing into water at pipeline and heat exchanger wall.
Operation principle of the present utility model is:
1, front preheating process: the nitrous oxides exhaust gas of cold conditions is at first entered in the front preheating process device by front preheating process device import 1.1, the high temperature nitrous oxides exhaust gas (360 ℃) that accounts for total processing air quantity about 15% is delivered in the front preheating process device 1 from 4 suctions of ammonia injector by preheating fan 7, the cold conditions nitrous oxides exhaust gas fully mixes by the static mixing district 1.4 in the front preheating process device with the backflow high-temperature flue gas and is warmed up to about 105 ℃, prevents the corrosivity composition dewfall in the nitrous oxides exhaust gas.
2, heat exchange: cold flue gas at first enters in the gas-gas heat exchanger 2 from the cold side import 2.3 of gas-gas heat exchanger 2, discharges from cold side outlet 2.4; And hot flue gas enters in the gas-gas heat exchanger 2 from hot side-entrance 2.1, discharges from hot side outlet 2.2.The partition heat exchange by heat exchanger tube in gas-gas heat exchanger 2 of cold flue gas and hot flue gas realizes heat exchange.The controlled concrete data that heat exchange are as follows:
Hot side-entrance 2.1 flue-gas temperatures: 360 ℃;
Hot side outlet 2.2 flue-gas temperatures: about 160 ℃;
Cold side import 2.3 flue-gas temperatures: 105 ℃;
Cold side exports 2.4 flue-gas temperatures: about 250 ℃.
The lowermost wall surface temperature of gas-gas heat exchanger 2 is 120 ℃, eliminated the corrosivity composition in the waste gas fully in heat exchanger wall dewfall, overcome the corrosion of waste gas to gas-gas heat exchanger 2, improved the service life of gas-gas heat exchanger 2, improved the stability of SCR denitrating system, simultaneously also improve the EGT after the heat exchange in to greatest extent, saved the heating energy consumption of follow-up heater 3.
3, heating: the heater import import 3.1 from heater 3 after nitrous oxides exhaust gas heats up through gas-gas heat exchanger 2 heat exchange enters heater 3, and heater 3 employing combustion gas or electrical heating heat to nitrous oxides exhaust gas about 350 ℃ reacts needed temperature to reach the SCR denitration catalyst.
4, the injection of ammonia: adopt ammonia or urea liquid to spray by spray gun 4.4 and enter in the nitrous oxides exhaust gas, nitrous oxides exhaust gas temperature at ammonia injector 4 is 360 ℃, in the rear end of spray gun 4.4 a hot air reflux extraction opening 4.3 is arranged, utilize preheating fan 7 that the hot blast (360 ℃) of 15% volume flow is transported in the front preheating process device 1.
5, the static mixing of flue gas: the nitrous oxides exhaust gas that tentatively is mixed with ammonia through ammonia injector 4 enters in the static mixer 5 from the static mixer import 5.1 of static mixer 5, nitrous oxides exhaust gas is through producing strong eddy current behind the static mixing plate after the five floor static mixing districts 5.3, so that nitrous oxides exhaust gas fully mixes with ammonia, equally also so that the temperature homogeneity of flue gas reaches more than 98%, be conducive to follow-up catalytic reaction.
6, catalytic reaction: entered in the catalytic reactor 6 by SCR denitration catalyst Reactor inlet 6.1 through static mixer 5 well-mixed nitrous oxides exhaust gas, at first by multilayer catalytic reduction layer 6.3, the nitrogen oxide in the flue gas and ammonia react and are converted into the nitrogen G﹠W incineration flue gas.
The utility model mixes ambient temperature nitrogen oxide waste gas before gas-gas heat exchanger with the part high-temperature hot-air, the temperature of nitrous oxides exhaust gas is brought up to 105 ℃ prevent that the corrosivity composition from pipeline and heat exchanger inwall dewfall, overcoming the corrosion of pipeline and gas-gas heat exchange.Simultaneously package unit is integrated into a U-shaped integrated apparatus, under the prerequisite of abatement apparatus corrosion, has saved the space, the heat reusable edible of whole device, energy-conservation to greatest extent, improve the equipment reliability of operation, prolonged the service life of equipment, its life-span can reach 8-10.
Claims (8)
1. integrated preposition preheating SCR denitrification apparatus, comprise the successively gas-gas heat exchanger of head and the tail connection, heater, the ammonia injector, static mixer and SCR catalytic reactor, it is characterized in that: also have a front preheating process device, front preheating process device one end is provided with exhaust gas inlet, the other end is provided with waste gas outlet, front preheating process device top has the hot blast import, the hot blast import is communicated with the hot blast delivery source, waste gas outlet is communicated with gas-gas heat exchanger, be provided with the static mixing district in the front preheating process device, the static mixing district is a round tube, the disk of built-in several the four jiaos of stars of round tube.
2. integrated preposition preheating SCR denitrification apparatus according to claim 1, it is characterized in that: described ammonia injector is provided with a hot air reflux mouth.
3. integrated preposition preheating SCR denitrification apparatus according to claim 2, it is characterized in that: described hot blast import outside is provided with preheating fan, preheating fan is communicated with the hot blast import by a hot air reflux pipe, and is communicated with the hot air reflux mouth by the hot air reflux pipe.
4. integrated preposition preheating SCR denitrification apparatus according to claim 3, it is characterized in that: described preheating fan is the high temperature stainless steel blower fan, and blower fan main shaft has the twice carbon ring seal.
5. integrated preposition preheating SCR denitrification apparatus according to claim 1, it is characterized in that: described static mixing Qu Si angle star disk is 30 ° of elevations angle and arranges in round tube take preposition preheater central axis as benchmark.
6. integrated preposition preheating SCR denitrification apparatus according to claim 1, it is characterized in that: described gas-gas heat exchanger is board-like or tubular heat exchanger, and gas-gas heat exchanger is provided with the cold side import, the waste gas outlet of front preheating process device is communicated with the cold side import.
7. integrated preposition preheating SCR denitrification apparatus according to claim 1, it is characterized in that: described static mixer is an asymmetric U-shaped tubular construction, be provided with successively five layers of mixed zone in it, each mixed zone is comprised of several four jiaos of star disks.
8. integrated preposition preheating SCR denitrification apparatus according to claim 1 is characterized in that: be filled with multilayer denitrating catalyst layer in the described catalytic reactor, interval 15-25cm between the adjacent two layers.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220569377 CN202860408U (en) | 2012-10-31 | 2012-10-31 | Integral preposed preheating SCR (Selective Catalytic Reduction) denitrating device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220569377 CN202860408U (en) | 2012-10-31 | 2012-10-31 | Integral preposed preheating SCR (Selective Catalytic Reduction) denitrating device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202860408U true CN202860408U (en) | 2013-04-10 |
Family
ID=48027168
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220569377 Expired - Lifetime CN202860408U (en) | 2012-10-31 | 2012-10-31 | Integral preposed preheating SCR (Selective Catalytic Reduction) denitrating device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202860408U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20160339381A1 (en) * | 2014-01-27 | 2016-11-24 | Thyssenkrupp Industrial Solutions Ag | Method for heat-treating a material flow and for cleaning resulting exhaust gases |
| CN111871194A (en) * | 2020-07-27 | 2020-11-03 | 重庆鲍斯净化设备科技有限公司 | High concentration nitrogen oxide tail gas treatment system |
-
2012
- 2012-10-31 CN CN 201220569377 patent/CN202860408U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20160339381A1 (en) * | 2014-01-27 | 2016-11-24 | Thyssenkrupp Industrial Solutions Ag | Method for heat-treating a material flow and for cleaning resulting exhaust gases |
| US9914093B2 (en) * | 2014-01-27 | 2018-03-13 | Thyssenkrupp Industrial Solutions Ag | Method for heat-treating a material flow and for cleaning resulting exhaust gases |
| CN111871194A (en) * | 2020-07-27 | 2020-11-03 | 重庆鲍斯净化设备科技有限公司 | High concentration nitrogen oxide tail gas treatment system |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101439260B (en) | System for removing nitrous oxides in low-temperature flue gas and technique thereof | |
| CN104190253A (en) | Coke oven flue gas SCR denitration system | |
| CN103463976B (en) | Sintering, pelletizing flue gas SCR denitration take off dioxin device | |
| CN205235766U (en) | Automatic control SCR flue gas denitration urea pyrolysis system | |
| CN204073849U (en) | Coke oven flue gas SCR denitration system | |
| CN105498532A (en) | Automatic control SCR flue gas denitrification urea pyrolysis system | |
| CN107261837A (en) | It is a kind of to quote denitrification apparatus and technique that high-temperature flue gas carries out urea pyrolysis ammonia | |
| WO2021218074A1 (en) | Flue structure for sncr denitrification of flue gas from pulverized coal boiler and heating sludge-drying heat transfer oil | |
| CN205392184U (en) | Small -size gas boiler flue gas low temperature catalytic denitrification system | |
| CN101890279A (en) | A kind of high-efficiency ammonia-method denitration process and device thereof | |
| CN103170230A (en) | Selective non-catalytic reduction reaction denitration system for cement kiln | |
| CN102357339A (en) | Efficient denitrifying device of circular fluidized bed boiler | |
| CN202860408U (en) | Integral preposed preheating SCR (Selective Catalytic Reduction) denitrating device | |
| CN201287029Y (en) | Low-temperature denitrifying system | |
| CN206965521U (en) | A kind of denitrification apparatus quoted high-temperature flue gas and carry out urea pyrolysis ammonia | |
| CN113209823A (en) | Low-temperature SCR denitration device and process for waste gas from nonferrous metal Kaldo furnace smelting | |
| CN201534059U (en) | Renewable heat-accumulating type selective catalytic reduction denitration device | |
| CN203342651U (en) | Urea pyrolysis and SCR (selective catalytic reduction) flue gas denitrification device | |
| CN209378806U (en) | A kind of low energy consumption afterburning heated type denitrating system | |
| CN205886604U (en) | SCR denitration ammonia injection system with oval plate mixed flow ware | |
| CN202289834U (en) | High-efficiency denitration device for circulating fluidized bed boiler | |
| CN204543995U (en) | A kind of cement kiln end low-temperature smoke air SCR denitrification apparatus | |
| CN209378805U (en) | A kind of distributed denitrating system of low energy consumption | |
| CN201719973U (en) | High-efficiency ammonia denitration device | |
| CN216295771U (en) | Low-temperature SCR denitration device for waste gas generated in smelting of nonferrous metal Kaldo furnace |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130410 |
|
| CX01 | Expiry of patent term |