CN105921012A - Device and method for removing nitric oxides in adipic acid tail gas - Google Patents
Device and method for removing nitric oxides in adipic acid tail gas Download PDFInfo
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- CN105921012A CN105921012A CN201610492301.XA CN201610492301A CN105921012A CN 105921012 A CN105921012 A CN 105921012A CN 201610492301 A CN201610492301 A CN 201610492301A CN 105921012 A CN105921012 A CN 105921012A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/86—Catalytic processes
- B01D53/8621—Removing nitrogen compounds
- B01D53/8625—Nitrogen oxides
- B01D53/8631—Processes characterised by a specific device
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/30—Improvements relating to adipic acid or caprolactam production
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- Environmental & Geological Engineering (AREA)
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- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Treating Waste Gases (AREA)
- Exhaust Gas Treatment By Means Of Catalyst (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
The invention discloses a device and a method for removing nitric oxides in adipic acid tail gas. The device comprises a reactor, an adipic acid tail gas discharge valve, a heater and a gas mixer, wherein a removal front sampling point and a removal front online concentration analyzer are arranged between the adipic acid tail gas discharge valve and the heater; a feeding thermometer is arranged between the heater and the gas mixer; the inlet of the gas mixer is connected with a gaseous ammonia pipeline and a low-pressure nitrogen gas replacement pipeline; a low-pressure nitrogen gas discharge valve is arranged on the low-pressure nitrogen gas replacement pipeline; a reactor inlet main valve and a reactor inlet bypass valve are arranged between the gas mixer and the reactor; a removal rear sampling point and a removal rear online concentration analyzer, a discharge pipeline valve and a reactor outlet main valve are arranged on the reactor outlet pipeline; an inlet-outlet differential pressure gauge and three thermometers are arranged on the reactor. According to the device, a catalyst can stably operate for a long time under a high-temperature acidic environment, so that corresponding reaction activity of the catalyst is kept, and a nitric oxide removal rate is higher than 95%.
Description
Technical field:
The present invention relates to a kind of exhaust gas processing device, particularly relate to the removing means of a kind of adipic acid nitrogen oxide in tail gas, and utilize the method that nitrogen oxides processes by this device, belong to the tail gas disposal technique field in adipic acid production process.
Background technology:
The tail gas of Production Processes of Adipic Acid can produce nitrogen oxides (nitric oxide, nitrogen dioxide), often produce the oxides of nitrogen gas of the adipic acid big appointment generation 0.06 ton of 1 ton.The annual production of current domestic adipic acid is about 2,000,000 tons, and the annual oxides of nitrogen gas produced counts roughly 120,000 tons.During domestic production, the adipic acid tail gas nitrogen oxide of 90% is to be directly discharged in air by Dilution air.Nitrogen oxides is to form acid rain and the one of the main reasons of haze, does great damage atmospheric environment.Although the domestic research to removing nitrogen oxides is more, but there is not yet the data of literatures about adipic acid tail gas nitrogen oxide removing means.Therefore, the most urgently seek a kind of nitrogen oxides device that can effectively remove in adipic acid tail gas and removal methods, meet the requirement of environmental protection.
Summary of the invention:
The technical problem to be solved is: providing a kind of adipic acid nitrogen oxide in tail gas removing means and method thereof, use this device and method that the removal efficiency of adipic acid nitrogen oxide in tail gas can be made to reach more than 95%, removal efficiency is higher.
The present invention solves that the technical scheme that technical problem is taked is as follows:
A kind of adipic acid nitrogen oxide in tail gas removing means, including reactor, also include adipic acid tail gas outlet valve, heater and the gas mixer being sequentially connected with along pipeline, it is provided with sample point and the front online concentration analyzer of removing before removing on pipeline between described adipic acid tail gas outlet valve and heater, the pipeline between described heater and gas mixer is provided with feeding temperature meter；The import of described gas mixer is replaced pipeline with gas ammonia pipeline and low-pressure nitrogen and is connected, described gas ammonia pipeline and low-pressure nitrogen displacement pipeline are arranged in parallel, described gas ammonia pipeline is provided with gas ammonia outlet valve and gas flowmeter, described low-pressure nitrogen displacement pipeline is provided with low-pressure nitrogen outlet valve；It is arranged in parallel on pipeline between described gas mixer and reactor and responds device entrance main valve and reactor inlet bypass valve, online concentration analyzer, blowdown piping valve and reactor outlet main valve after sample point after being provided with removing on the pipeline being connected with reactor outlet, removing；Inlet outlet pressure differential meter and three thermometeies it are provided with on described reactor.
Material control valve it is respectively arranged with between sample point and pipeline after sample point and removing before described removing；It is respectively arranged with voltage-controlled valve between described inlet outlet pressure differential meter and the import and export of reactor；Described three thermometeies are set up in parallel, and are separately positioned on the entrance point of described reactor, centre and the port of export.
If described reactor midfeather is provided with between dried layer steel wire, two ends and steel wire and is filled with active ceramic balls.
Utilizing adipic acid nitrogen oxide in tail gas removing means recited above to the method removing nitrogen oxides, it specifically comprises the following steps that
1. adipic acid tail gas nitrogen oxide is transported in gas mixer under finite concentration after heater is warming up to 200 DEG C, wherein: the concentration of adipic acid tail gas nitrogen oxide controls between 100ppm～2000ppm；
2. catalyst reactor acts intensification of living: close reactor inlet main valve and reactor outlet main valve, elevated temperature gas enters in reactor by reactor inlet bypass valve, catalyzer temperature-elevating is played work, after elevated temperature gas is vented by blowdown piping valve, it is recycled to adipic acid tail gas outlet valve and is circulated process；
3. when reaction bed temperature reaches more than 200 DEG C, open reactor inlet main valve and reactor outlet main valve, close blowdown piping valve；
4. open gas ammonia outlet valve, make the nitrogen oxides in adipic acid tail gas resolve into N in the reactor2And H2O, the mol ratio controlling nitrogen oxides and ammonia in course of reaction is (1.1～1.2): 1, ensures that the pressure differential of reactor import and export is between 0～0.01MPa by inlet outlet pressure differential meter and reactor inlet bypass valve；
5. the displacement of the low-pressure nitrogen under emergency episode: close adipic acid tail gas outlet valve and gas ammonia outlet valve, opens low-pressure nitrogen outlet valve, by the ammonia in low-pressure nitrogen displacement pipeline displacement pipeline, prevents from forming ammonia salt.
The inlet gas concentration controlling nitrogen oxides by concentration analyzer online before sample point before removing and removing is maintained between 100ppm～2000ppm；Control reacted nitrous oxides concentration by concentration analyzer online after sample point after removing and removing and be maintained at below 50ppm.
Compared to the prior art, actively the having the beneficial effect that of the present invention:
1, using the adipic acid tail gas nitrogen oxide removing means of the present invention and method can make the removal efficiency of nitrogen oxides more than 95%, removal efficiency is higher；This device can make catalyst stable operation in the environment of being in long term high temperature, acidity, keeps its corresponding reactivity.
2, manual sampling and in-line analyzer dual fail-safe before and after the present invention uses the reaction of adipic acid nitrogen oxide in tail gas, can truly grasp the concentration of gas, quickly and accurately adjust ammonia input, it is to avoid adipic acid plant causes concentration change to affect the removal efficiency of nitrogen oxides because of load adjustment；Can prevent again excessive ammonia from forming ammonium salt at pipeline and device interior simultaneously, cause security incident.
3, distinctive filling mode in reactor of the present invention, arrange the purpose of steel wire be in order to allow steel wire stress time more stable, and prevent catalyst from dropping to reactor bottom；Filling special active Ceramic Balls, it is ensured that fully adsorb non-N-oxide impurity gas before entering beds.
4, the present invention is provided with low-pressure nitrogen displacement pipeline, the low-pressure nitrogen displacement under emergency episode, forms ammonium salt, safe and stable arrangement is effectively ensured in can effectively preventing pipeline and equipment.
5, during the catalyzer temperature-elevating in the present invention rises and lives, after elevated temperature gas is vented by blowdown piping valve, it is recycled to adipic acid tail gas outlet valve and is circulated process, prevent the nitrogen oxides in adipic acid tail gas from discarding and drain in air, improve removal efficiency.
Accompanying drawing illustrates:
Fig. 1 is the structural representation of adipic acid nitrogen oxide in tail gas removing means of the present invention.
Detailed description of the invention:
Below by specific embodiment, the present invention will be further explained, but protection scope of the present invention is not limited to this.
Embodiment 1:
See Fig. 1, a kind of adipic acid nitrogen oxide in tail gas removing means, including reactor 10, also include adipic acid tail gas outlet valve 1, heater 4 and the gas mixer 6 being sequentially connected with along pipeline, it is provided with sample point 2 and the front online concentration analyzer 3 of removing before removing on pipeline between adipic acid tail gas outlet valve 1 and heater 4, the pipeline between heater 4 and gas mixer 6 is provided with feeding temperature meter 5；The import of described gas mixer 6 is replaced pipeline with gas ammonia pipeline and low-pressure nitrogen and is connected, gas ammonia pipeline and low-pressure nitrogen displacement pipeline are arranged in parallel, gas ammonia pipeline is provided with gas ammonia outlet valve 16 and gas flowmeter 15, low-pressure nitrogen displacement pipeline is provided with low-pressure nitrogen outlet valve 17；Be arranged in parallel on pipeline between gas mixer 6 and reactor 10 and respond device entrance main valve 7 and reactor inlet bypass valve 8, be provided with removing on reactor 10 pipeline that is connected of outlet after concentration analyzer 12, blowdown piping valve 13 and reactor outlet main valve 14 online after sample point 11, removing；Reactor 10 is provided with inlet outlet pressure differential meter 9 and three thermometeies 18,19 and 20.
It is respectively arranged with material control valve between sample point 11 and pipeline after sample point 2 and removing before removing；It is respectively arranged with voltage-controlled valve between the import and export of inlet outlet pressure differential meter 9 and reactor 10；Three thermometeies 18,19 and 20 are set up in parallel, and are separately positioned on the entrance point of reactor 10, centre and the port of export.
If being arranged at intervals with between in reactor 10 between dried layer steel wire, two ends and steel wire and being filled with active ceramic balls.
Embodiment 2:
The method utilizing the device of embodiment 1 to process the nitrogen oxides in adipic acid tail gas, specifically comprises the following steps that
1. adipic acid tail gas nitrogen oxide is transported in gas mixer under finite concentration after heater is warming up to 200 DEG C, wherein: the concentration of adipic acid tail gas nitrogen oxide controls between 100ppm～2000ppm；
2. catalyst reactor acts intensification of living: close reactor inlet main valve and reactor outlet main valve, elevated temperature gas enters in reactor by reactor inlet bypass valve, catalyzer temperature-elevating is played work, after elevated temperature gas is vented by blowdown piping valve, it is recycled to adipic acid tail gas outlet valve and is circulated process；
3. when reaction bed temperature reaches more than 200 DEG C, open reactor inlet main valve and reactor outlet main valve, close blowdown piping valve；
4. open gas ammonia outlet valve, make the nitrogen oxides in adipic acid tail gas resolve into N in the reactor2And H2O, the mol ratio controlling nitrogen oxides and ammonia in course of reaction is (1.1～1.2): 1, ensures that the pressure differential of reactor import and export is between 0～0.01MPa by inlet outlet pressure differential meter and reactor inlet bypass valve；
5. the displacement of the low-pressure nitrogen under emergency episode: close adipic acid tail gas outlet valve and gas ammonia outlet valve, opens low-pressure nitrogen outlet valve, by the ammonia in low-pressure nitrogen displacement pipeline displacement pipeline, prevents from forming ammonia salt, causes security incident.
Step 4. in, open gas ammonia outlet valve time, ammonia pressure and temperature control 0.3MPa, 100 DEG C.
The inlet gas concentration controlling nitrogen oxides by concentration analyzer online before sample point before removing and removing is maintained between 100ppm～2000ppm；Control reacted nitrous oxides concentration by concentration analyzer online after sample point after removing and removing and be maintained at below 50ppm.
Claims (5)
1. an adipic acid nitrogen oxide in tail gas removing means, including reactor (10), it is characterized in that: described adipic acid nitrogen oxide in tail gas removing means also includes adipic acid tail gas outlet valve (1), heater (4) and the gas mixer (6) being sequentially connected with along pipeline, it is provided with sample point (2) and the front online concentration analyzer (3) of removing before removing on pipeline between described adipic acid tail gas outlet valve (1) and heater (4), the pipeline between described heater (4) and gas mixer (6) is provided with feeding temperature meter (5)；The import of described gas mixer (6) is replaced pipeline with gas ammonia pipeline and low-pressure nitrogen and is connected, described gas ammonia pipeline and low-pressure nitrogen displacement pipeline are arranged in parallel, described gas ammonia pipeline is provided with gas ammonia outlet valve (16) and gas flowmeter (15), described low-pressure nitrogen displacement pipeline is provided with low-pressure nitrogen outlet valve (17)；Be arranged in parallel on pipeline between described gas mixer (6) and reactor (10) and respond device entrance main valve (7) and reactor inlet bypass valve (8), be provided with removing on reactor (10) pipeline that is connected of outlet after concentration analyzer (12), blowdown piping valve (13) and reactor outlet main valve (14) online after sample point (11), removing；Inlet outlet pressure differential meter (9) and three thermometeies (18,19,20) it are provided with on described reactor (10).
Adipic acid nitrogen oxide in tail gas removing means the most according to claim 1, it is characterised in that: it is respectively arranged with material control valve between sample point (11) and pipeline after sample point (2) and removing before described removing；It is respectively arranged with voltage-controlled valve between described inlet outlet pressure differential meter (9) and the import and export of reactor (10)；Described three thermometeies (18,19,20) are set up in parallel, and are separately positioned on the entrance point of described reactor (10), centre and the port of export.
Adipic acid nitrogen oxide in tail gas removing means the most according to claim 2, it is characterised in that: described reactor (10) is filled with active ceramic balls if midfeather is provided with between dried layer steel wire, two ends and steel wire.
4. utilizing the adipic acid nitrogen oxide in tail gas removing means described in claim 1 or 2 or 3 to the method removing nitrogen oxides, it specifically comprises the following steps that
1. adipic acid tail gas nitrogen oxide is transported in gas mixer (6) under finite concentration after heater (4) is warming up to 200 DEG C, wherein: the concentration of adipic acid tail gas nitrogen oxide controls between 100ppm～2000ppm；
2. catalyst reactor acts intensification of living: close reactor inlet main valve (7) and reactor outlet main valve (14), elevated temperature gas enters in reactor (10) by reactor inlet bypass valve (8), catalyzer temperature-elevating is played work, after elevated temperature gas is vented by blowdown piping valve (13), it is recycled to adipic acid tail gas outlet valve (1) and is circulated process；
3. when reaction bed temperature reaches more than 200 DEG C, open reactor inlet main valve (7) and reactor outlet main valve (14), close blowdown piping valve (13)；
4. open gas ammonia outlet valve (16), make the nitrogen oxides in adipic acid tail gas resolve into N in reactor (10)2And H2O, the mol ratio controlling nitrogen oxides and ammonia in course of reaction is (1.1～1.2): 1, ensures that the pressure differential of reactor (10) import and export is between 0～0.01MPa by inlet outlet pressure differential meter (9) and reactor inlet bypass valve (8)；
5. the displacement of the low-pressure nitrogen under emergency episode: close adipic acid tail gas outlet valve (1) and gas ammonia outlet valve (16), opens low-pressure nitrogen outlet valve (17), by the ammonia in low-pressure nitrogen displacement pipeline displacement pipeline, prevents from forming ammonia salt.
The method of removing nitrogen oxides the most according to claim 4, it is characterised in that: the inlet gas concentration controlling nitrogen oxides by concentration analyzer (3) online before sample point (2) before removing and removing is maintained between 100ppm～2000ppm；Control reacted nitrous oxides concentration by concentration analyzer (12) online after sample point (11) after removing and removing and be maintained at below 50ppm.
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| CN201610492301.XA CN105921012B (en) | 2016-06-29 | 2016-06-29 | Adipic acid nitrogen oxide in tail gas removing means and its method |
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| CN201610492301.XA CN105921012B (en) | 2016-06-29 | 2016-06-29 | Adipic acid nitrogen oxide in tail gas removing means and its method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106823793A (en) * | 2017-04-01 | 2017-06-13 | 平顶山市普恩科技有限公司 | A kind of removing means and removal methods of adipic acid nitrogen oxide in tail gas |
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2016
- 2016-06-29 CN CN201610492301.XA patent/CN105921012B/en active Active
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106823793A (en) * | 2017-04-01 | 2017-06-13 | 平顶山市普恩科技有限公司 | A kind of removing means and removal methods of adipic acid nitrogen oxide in tail gas |
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