CN104421946B - Method for treating acrylonitrile off-gas - Google Patents
Method for treating acrylonitrile off-gas Download PDFInfo
- Publication number
- CN104421946B CN104421946B CN201310388676.8A CN201310388676A CN104421946B CN 104421946 B CN104421946 B CN 104421946B CN 201310388676 A CN201310388676 A CN 201310388676A CN 104421946 B CN104421946 B CN 104421946B
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- China
- Prior art keywords
- gas
- baffle plate
- arcuate openings
- acrylonitrile
- temperature control
- 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.)
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G7/00—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals
- F23G7/06—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals of waste gases or noxious gases, e.g. exhaust gases
-
- 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
- B01D53/46—Removing components of defined structure
- B01D53/54—Nitrogen compounds
- B01D53/56—Nitrogen oxides
-
- 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G2209/00—Specific waste
- F23G2209/14—Gaseous waste or fumes
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- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Chemical & Material Sciences (AREA)
- General Chemical & Material Sciences (AREA)
- Biomedical Technology (AREA)
- Analytical Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
- Exhaust Gas Treatment By Means Of Catalyst (AREA)
Abstract
The invention relates to a method for treating acrylonitrile off-gas. The method for treating acrylonitrile off-gas is that the burning pre-treating process, the process of heat exchange for pre-treated off-gas and the process of selective catalytic reduction of the off-gas subjected to heat exchange are integrally to be done from low to high to top through a device; the mixed gas of acrylonitrile off-gas and air enters the burning pre-treating stage through a gas inlet to be burnt; the pre-treated and burnt off-gas flows round a baffle with an arch-shaped opening to enter a cooling temperature control section to be cooled through a cooling water coil, and then flows through the baffle via the arch-shaped opening to enter the selective catalytic reduction stage; the gas in the selective catalytic reduction stage is distributed through a gas distributing plate and then is subjected to contact reaction with a catalytic; the off-gas after NOx reduction flows out of the device through an outlet. The method ensures the optimal denitration effect and enables balanced use of the catalyst, and therefore, the service life of the catalyst is prolonged.
Description
Technical field
The present invention relates to a kind of acrylonitrile off-gas processing method, it is mainly used at the exhaust emissions of production device for acrylic nitrile
Reason.
Background technology
Acrylonitrile is three big synthetic materials（Fiber, rubber, plastics）Important industrial chemicals, mainly have three productions at present
Method, is cyanoethanol method, acetylene method and propylene ammmoxidation process respectively.Wherein propylene ammmoxidation process is producer main at present
Method.The method with propylene, ammonia as primary raw material, produce acrylonitrile while, simultaneously with for hydrocyanic acid, acetonitrile, acrylic aldehyde,
CO2With serial by-products such as CO, after the operation such as washing absorption, its tail gas mainly contains propylene, propane, CO, CO2、NOx、
H2O.
Acrylonitrile off-gas are due to containing substantial amounts of propylene, propane and CO, therefore being carried out using selective catalytic reduction
During NOx catalysis reduction, need propylene, propane and CO to be carried out burning pretreatment so as to become harmless carbon dioxide first
And water, the tail gas after process enters back into catalytic reduction reactor and carries out reduction reaction.Because the temperature of the reaction of the latter needs to control
System, at 300～500 degrees Celsius, needs to carry out heat exchange hence into tail gas before reacting in catalytic reduction reactor, by tail gas temperature
Degree drops to preset value.
Content of the invention
It is an object of the invention to provide a kind of acrylonitrile off-gas processing method.Optimal same ensureing that denitration effect reaches
When, also make catalyst be equalized utilizing, improve the service life of catalyst.
Acrylonitrile off-gas processing meanss of the present invention are by pretreatment section of burning, cooling temperature control section and selective catalysis also
Former section of three part compositions；Burning pretreatment section, cooling temperature control section and SCR section are in turn connected into circle from the bottom to top
Tubular construction, two ends are sealed by semicircle end socket；Offgas outlet is arranged on upper cover, and air inlet is arranged on lower public attention；Cooling temperature
Control section is provided with cooling water coil, and the cooling water inlet/outlet pipe of cooling water coil is arranged on cooling temperature control section barrel；Cooling temperature control
Section lower end is provided with arcuate openings baffle plate, and upper end is provided with arcuate openings and flows through baffle plate, and arcuate openings baffle plate and arcuate openings flow through gear
Plate becomes 90～180 ° of dislocation arrangements around axle center；SCR section is provided with gas distribution grid, sets above gas distribution grid
It is equipped with catalyst.
Described acrylonitrile off-gas processing meanss will be burnt tail gas after pretreatment, pretreated tail gas heat exchange and heat exchange
Three process integration of SCR are in a device.Idiographic flow is：Acrylonitrile off-gas and air Mixture are passed through
Air inlet enters burning pretreatment section and is burnt, and the tail gas after precombustion is processed has bypassed arcuate openings baffle plate entrance cooling temperature
Control section, after cooled water coil cools, flows through baffle plate by arcuate openings, enters SCR section, by gas
After body distribution grid carries out gas reallocation, with catalyst haptoreaction, reduce the tail gas after NOx through exporting out device.
The arcuate openings area that described arcuate openings baffle plate, arcuate openings flow through baffle plate accounts for the baffle plate gross area 10～40%,
Opening direction is parallel with cooling water outlet and inlet direction or opening direction is vertical with cooling water outlet and inlet direction or opening is located at baffle plate
Center.
Described gas distributor perforated area accounts for the distributor gross area 5～40%.
Using arcuate openings baffle plate and arcuate openings flow through baffle plate around axle center become 90～180 ° dislocation arrangement by the way of, force
Tail gas after precombustion is processed is fully contacted cooling with cooling water coil, then the undergauge effect leading to through exit baffle plate is strengthened
The tail gas laggard selectable of mixing after cooling is catalyzed reduction section, for avoiding producing impact to catalyst, in formal tail gas with urge
Through gas distributor reallocation before agent contact.Thus all tail gas entering selective reduction section are in identical temperature, pressure
Catalytic reduction process is completed under state.Having an advantage in that of this patent, while ensureing that denitration effect reaches optimal, also makes to urge
Agent is equalized utilizing, and improves the service life of catalyst.
Brief description
Fig. 1 a device arcuate openings baffle plate elevational schematic view parallel with cooling water inlet direction
Fig. 1 b device baffle plate arcuate openings schematic front view parallel with cooling water inlet direction
Fig. 2 a device arcuate openings baffle plate elevational schematic view vertical with cooling water inlet direction
Fig. 2 b device arcuate openings baffle plate schematic front view vertical with cooling water inlet direction
Fig. 3 a device baffle plate adopts center drilling elevational schematic view
Fig. 3 b device baffle plate adopts center drilling schematic top plan view
Wherein：1. air inlet, 2. burning pretreatment section, 3-1. arcuate openings baffle plate, 3-2. arcuate openings flow through baffle plate, 4.
Cooling temperature control section, 5. gas distribution grid, 6. SCR section, 7. offgas outlet.
Specific embodiment
Embodiment 1
Referring to Fig. 1, acrylonitrile off-gas processing meanss of the present invention are by pretreatment section 2 of burning, cooling temperature control section 4 and choosing
Selecting property catalysis reduction section 6 three part composition；Burning pretreatment section 2, cooling temperature control section 4 and SCR section 6 by down to
On be in turn connected into columnar structured, two ends are sealed by semicircle end socket；Offgas outlet 7 is arranged on upper cover, and air inlet 1 is arranged
In lower public attention；Cooling temperature control section 4 is provided with cooling water coil, and the cooling water inlet/outlet pipe of cooling water coil is arranged on cooling temperature control section
On barrel；Cooling temperature control section lower end is provided with arcuate openings baffle plate 3-1, and upper end is provided with arcuate openings and flows through baffle plate 3-2, and arch is opened
Mouth baffle plate 3-1 flows through baffle plate 3-2 with arcuate openings and becomes 180 ° of dislocation arrangements around axle center；SCR section 6 is provided with gas
Body distribution grid 5, is provided with catalyst above gas distribution grid 5.
Arcuate blocking piece aperture area accounts for the baffle plate gross area 40%, and opening direction is parallel with cooling water outlet and inlet direction.
Embodiment 2
Referring to Fig. 2, it is made up of burning pretreatment section 2, cooling temperature control section 4 and SCR section 6 three part.Wherein
Cooling temperature control section 4 is made up of cooling water coil.Acrylonitrile off-gas and air gas mixture are passed through air inlet 1 and are entered burning pretreatment
Section 2 is burnt, and the baffle plate 3-1 that the tail gas after precombustion process bypasses arcuate openings enters cooling temperature control section 4, cooled water
After coil pipe cools, flow through baffle plate 3-2 by arcuate openings, enter SCR section 6, by gas distribution grid 5
After carrying out gas reallocation, with catalyst haptoreaction, reduce the tail gas after NOx and go out device through outlet 7.Wherein baffle plate 3-1 with
3-2 arcuate blocking piece aperture area accounts for total baffle plate area 10%, and opening direction is vertical with cooling water outlet and inlet direction, baffle plate 3-1 and 3-
2 around axle center dislocation in 90 ° arrangement.
Embodiment 3
Referring to Fig. 3, it is made up of burning pretreatment section 2, cooling temperature control section 4 and SCR section 6 three part.Wherein
Cooling temperature control section 4 is made up of cooling water coil.Acrylonitrile off-gas and air gas mixture are passed through air inlet 1 and are entered burning pretreatment
Section 2 is burnt, and the tail gas after precombustion is processed is directly entered cooling temperature control section 4, after cooled water coil cools, passes through
The baffle plate 3 of central opening, enters SCR section 6, after gas distribution grid 5 carries out gas reallocation, with catalysis
Agent haptoreaction, the tail gas after reduction NOx goes out device through outlet 7.Wherein baffle plate 3 center open area accounts for the baffle plate gross area
30%, its role is to using undergauge effect realize precombustion process after tail gas abundant.
Claims (6)
1. a kind of acrylonitrile off-gas processing method it is characterised in that：This method is by pretreatment of burning, pretreated tail gas heat exchange
And three processes of tail gas selective catalytic reducing are integrated into from the bottom to top in a device and complete after heat exchange；
Burning pretreatment section, cooling temperature control section and SCR section be in turn connected into from the bottom to top columnar structured, two
End is sealed by semicircle end socket；Offgas outlet is arranged on upper cover, and air inlet is arranged on low head；Cooling temperature control section is provided with cold
But water coil, the cooling water inlet/outlet pipe of cooling water coil is arranged on cooling temperature control section barrel；Cooling temperature control section lower end is provided with bow
Shape open closure, upper end is provided with arcuate openings and flows through baffle plate, and arcuate openings baffle plate flows through baffle plate with arcuate openings and becomes 90 around axle center
～180 ° of dislocation arrangements；SCR section is provided with gas distribution grid, is provided with catalyst above gas distribution grid；
Acrylonitrile off-gas and air Mixture enter burning pretreatment section by air inlet and are burnt, the tail after precombustion process
Gas has bypassed arcuate openings baffle plate and has entered cooling temperature control section, after cooled water coil cools, flows through gear by arcuate openings
Plate, enters SCR section, after gas distribution grid carries out gas reallocation, with catalyst haptoreaction, reduces
Tail gas after NOx is through exporting out device.
2. acrylonitrile off-gas processing method according to claim 1 it is characterised in that：
Arcuate openings baffle plate and arcuate openings flow through the 10-40% that baffle plate upper shed area accounts for the baffle plate gross area.
3. acrylonitrile off-gas processing method according to claim 1 it is characterised in that：Gas distributor perforated area accounts for point
The cloth device gross area 5～40%.
4. acrylonitrile off-gas processing method according to claim 1 it is characterised in that：Arcuate openings baffle plate, arcuate openings
The arcuate openings direction flowing through baffle plate is parallel with cooling water outlet and inlet direction.
5. acrylonitrile off-gas processing method according to claim 1 it is characterised in that：Arcuate openings baffle plate, arcuate openings
The arcuate openings direction flowing through baffle plate is vertical with cooling water outlet and inlet direction.
6. acrylonitrile off-gas processing method according to claim 1 it is characterised in that：Arcuate openings baffle plate, arcuate openings
The opening flowing through baffle plate is located at baffle center.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310388676.8A CN104421946B (en) | 2013-08-30 | 2013-08-30 | Method for treating acrylonitrile off-gas |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310388676.8A CN104421946B (en) | 2013-08-30 | 2013-08-30 | Method for treating acrylonitrile off-gas |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104421946A CN104421946A (en) | 2015-03-18 |
| CN104421946B true CN104421946B (en) | 2017-02-15 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310388676.8A Active CN104421946B (en) | 2013-08-30 | 2013-08-30 | Method for treating acrylonitrile off-gas |
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| CN (1) | CN104421946B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115095876A (en) * | 2016-05-24 | 2022-09-23 | 英尼奥斯欧洲股份公司 | Exhaust gas incinerator control |
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2013
- 2013-08-30 CN CN201310388676.8A patent/CN104421946B/en active Active
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| Publication number | Publication date |
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| CN104421946A (en) | 2015-03-18 |
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