CN107855002A - A kind of method and its device of honeycomb fashion low-temperature denitration - Google Patents
A kind of method and its device of honeycomb fashion low-temperature denitration Download PDFInfo
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- CN107855002A CN107855002A CN201711215701.7A CN201711215701A CN107855002A CN 107855002 A CN107855002 A CN 107855002A CN 201711215701 A CN201711215701 A CN 201711215701A CN 107855002 A CN107855002 A CN 107855002A
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- 238000000034 method Methods 0.000 title claims abstract description 27
- 239000007789 gas Substances 0.000 claims abstract description 61
- 239000003054 catalyst Substances 0.000 claims abstract description 54
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 claims abstract description 18
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims abstract description 14
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 14
- 229910052878 cordierite Inorganic materials 0.000 claims abstract description 14
- JSKIRARMQDRGJZ-UHFFFAOYSA-N dimagnesium dioxido-bis[(1-oxido-3-oxo-2,4,6,8,9-pentaoxa-1,3-disila-5,7-dialuminabicyclo[3.3.1]nonan-7-yl)oxy]silane Chemical compound [Mg++].[Mg++].[O-][Si]([O-])(O[Al]1O[Al]2O[Si](=O)O[Si]([O-])(O1)O2)O[Al]1O[Al]2O[Si](=O)O[Si]([O-])(O1)O2 JSKIRARMQDRGJZ-UHFFFAOYSA-N 0.000 claims abstract description 14
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims abstract description 11
- 229910000422 cerium(IV) oxide Inorganic materials 0.000 claims abstract description 11
- 229910052593 corundum Inorganic materials 0.000 claims abstract description 11
- 229910001845 yogo sapphire Inorganic materials 0.000 claims abstract description 11
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims abstract description 10
- 230000001413 cellular effect Effects 0.000 claims abstract description 7
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 7
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 6
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 6
- 239000001301 oxygen Substances 0.000 claims abstract description 6
- 229910002092 carbon dioxide Inorganic materials 0.000 claims abstract description 5
- 239000001569 carbon dioxide Substances 0.000 claims abstract description 5
- 229910021529 ammonia Inorganic materials 0.000 claims abstract description 4
- 230000003197 catalytic effect Effects 0.000 claims abstract description 4
- 238000004781 supercooling Methods 0.000 claims abstract description 4
- 238000010438 heat treatment Methods 0.000 claims description 21
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 14
- 229910000831 Steel Inorganic materials 0.000 claims description 13
- 239000010959 steel Substances 0.000 claims description 13
- 239000008367 deionised water Substances 0.000 claims description 12
- 229910021641 deionized water Inorganic materials 0.000 claims description 12
- 238000003756 stirring Methods 0.000 claims description 11
- 239000000843 powder Substances 0.000 claims description 10
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 9
- 239000012159 carrier gas Substances 0.000 claims description 9
- 238000002156 mixing Methods 0.000 claims description 9
- 239000004372 Polyvinyl alcohol Substances 0.000 claims description 6
- 229910052782 aluminium Inorganic materials 0.000 claims description 6
- 238000009413 insulation Methods 0.000 claims description 6
- 229920002451 polyvinyl alcohol Polymers 0.000 claims description 6
- 238000001354 calcination Methods 0.000 claims description 5
- 229910002091 carbon monoxide Inorganic materials 0.000 claims description 5
- 239000002002 slurry Substances 0.000 claims description 4
- 229910052684 Cerium Inorganic materials 0.000 claims description 3
- 150000000703 Cerium Chemical class 0.000 claims description 3
- 230000032683 aging Effects 0.000 claims description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 3
- 235000011114 ammonium hydroxide Nutrition 0.000 claims description 3
- 238000007664 blowing Methods 0.000 claims description 3
- 239000003995 emulsifying agent Substances 0.000 claims description 3
- 239000011572 manganese Substances 0.000 claims description 3
- 150000002696 manganese Chemical class 0.000 claims description 3
- 238000002360 preparation method Methods 0.000 claims description 3
- 150000003839 salts Chemical class 0.000 claims description 3
- 238000005070 sampling Methods 0.000 claims description 3
- 239000002904 solvent Substances 0.000 claims description 3
- 239000003795 chemical substances by application Substances 0.000 claims description 2
- 229910000975 Carbon steel Inorganic materials 0.000 claims 1
- GCNLQHANGFOQKY-UHFFFAOYSA-N [C+4].[O-2].[O-2].[Ti+4] Chemical compound [C+4].[O-2].[O-2].[Ti+4] GCNLQHANGFOQKY-UHFFFAOYSA-N 0.000 claims 1
- 239000010962 carbon steel Substances 0.000 claims 1
- 238000006555 catalytic reaction Methods 0.000 claims 1
- 230000003111 delayed effect Effects 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 8
- 238000005265 energy consumption Methods 0.000 abstract description 3
- 230000009514 concussion Effects 0.000 abstract description 2
- 238000001802 infusion Methods 0.000 abstract description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 239000002994 raw material Substances 0.000 abstract description 2
- CETPSERCERDGAM-UHFFFAOYSA-N ceric oxide Chemical compound O=[Ce]=O CETPSERCERDGAM-UHFFFAOYSA-N 0.000 abstract 1
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 description 6
- 238000006243 chemical reaction Methods 0.000 description 5
- 238000011156 evaluation Methods 0.000 description 5
- 239000003546 flue gas Substances 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 239000007788 liquid Substances 0.000 description 2
- 229910001868 water Inorganic materials 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006477 desulfuration reaction Methods 0.000 description 1
- 230000023556 desulfurization Effects 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 238000011068 loading method Methods 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
Classifications
-
- 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
- B01D53/8628—Processes characterised by a specific catalyst
-
- 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
- B01D53/90—Injecting reactants
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
- B01J23/16—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of arsenic, antimony, bismuth, vanadium, niobium, tantalum, polonium, chromium, molybdenum, tungsten, manganese, technetium or rhenium
- B01J23/32—Manganese, technetium or rhenium
- B01J23/34—Manganese
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/20—Reductants
- B01D2251/206—Ammonium compounds
- B01D2251/2062—Ammonia
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2255/00—Catalysts
- B01D2255/20—Metals or compounds thereof
- B01D2255/206—Rare earth metals
- B01D2255/2065—Cerium
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2255/00—Catalysts
- B01D2255/20—Metals or compounds thereof
- B01D2255/207—Transition metals
- B01D2255/2073—Manganese
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2255/00—Catalysts
- B01D2255/20—Metals or compounds thereof
- B01D2255/209—Other metals
- B01D2255/2092—Aluminium
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Biomedical Technology (AREA)
- Analytical Chemistry (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Organic Chemistry (AREA)
- Materials Engineering (AREA)
- Catalysts (AREA)
- Exhaust Gas Treatment By Means Of Catalyst (AREA)
Abstract
The present invention relates to a kind of method and its device of honeycomb fashion low-temperature denitration, this method is specifically included first, and oxygen, nitrogen, carbon dioxide, CO gas and nitric oxide gas are mixed according to certain ratio, and is preheated；Secondly, the mixed gas after preheating and ammonia are mixed according to certain ratio, mixed gas is subjected to catalytic denitration processing according to certain flow by the fixed bed reactors provided with cellular catalyst；Finally, gas after treatment is discharged after supercooling by exhaust fan.Due to being coated using above-mentioned technical proposal, the inventive method using infusion process, technique is simple, and energy consumption is low, has good application prospect.After supported catalyst, honeycomb cordierite specific surface area dramatically increases, and active component is evenly distributed in carrier surface.Handled by concussion, it is found that active component and carrier is combined closely.Meanwhile Mn CeO2/Al2O3Catalyst raw material is easy to get, nonhazardous effect, and manufacturing cycle is shorter.
Description
Technical field
The present invention relates to a kind of method and its device of honeycomb fashion low-temperature denitration.
Background technology
Existing laboratory simulation equipment for denitrifying flue gas is only limitted to use powder catalyst, and loadings are milligram level, and carrier gas
For inert gas or nitrogen, steam is brought into by carrier gas, larger with power plant actual denitrating technique difference, and simulates effect with actually making
With situation, there is any discrepancy, it is impossible to evaluates denitrating catalyst well, is unfavorable for denitrating catalyst industrialization.
The content of the invention
In order to solve the above problems, it is an object of the invention to provide a kind of technique is simple, energy consumption is low, has preferably stable
Property.And it is passed through SO2、H2O behind efficiencies are stable 65%, have a kind of side of honeycomb fashion low-temperature denitration of preferable anti-poisoning capability
Method and its device.
The technical scheme is that：A kind of method of honeycomb fashion low-temperature denitration, this method specifically include following steps：
A kind of method of honeycomb fashion low-temperature denitration, it is characterised in that this method specifically includes following steps：
First, oxygen, nitrogen, carbon dioxide, carbon monoxide and nitric oxide gas are mixed according to certain ratio, and
Preheated；
Secondly, the mixed gas after preheating and ammonia are mixed according to certain ratio, by mixed gas according to one
Fixed flow carries out catalytic denitration processing by the fixed bed reactors provided with cellular catalyst；
Finally, gas after treatment is discharged after supercooling by exhaust fan.
Further, the temperature of the preheating is 80-200 DEG C.
Further, the flow is 5-100m3/h。
Further, the cellular catalyst layer is by Mn-CeO2/Al2O3Catalyst powder is made, the percentage of each component
For Mn：10%-30%, Ce：60%-85%, Al：5%-20%.
Further, it is described prepare honeycomb cordierite denitrating catalyst preparation technology be：Using deionized water as solvent, weigh
A certain amount of aluminum soluble salt, soluble cerium salt and soluble manganese salt are dissolved in deionized water respectively, stir 1.8-2.2h；
Then 15%-45% ammoniacal liquor stirring is added dropwise in mixed liquor, until pH=8-10, continues to stir 1-3h,
It is unchanged to pH with deionized water rinsing after still aging 10-15h；
Finally in moving air atmosphere, temperature dries 10-15h under the conditions of being 100-120 DEG C, is 400-600 in temperature
DEG C calcining 1-5h, be cooled to room temperature, obtain Mn-CeO2/Al2O3Catalyst powder；
Polyvinyl alcohol (PVA), emulsifier op-10 are added in deionized water, 0.5-5h is stirred, obtains creamy paste
Liquid, it is slowly added to Mn-CeO2/Al2O3Powder, stir 0.5-3h.Honeycomb cordierite catalyst carrier is finally immersed in catalyst
In slurry, aperture blowing, calcining, described low-temperature denitration catalyst is obtained.
Another object of the present invention provides above-mentioned implementation method and uses a kind of honeycomb fashion low-temperature denitration device, the denitrification apparatus
Including carrier gas source steel cylinder, gas mixing tank, gas heating dress, steam react device, fixed bed reactors, gas cooler and
Exhaust fan；
Wherein, the carrier gas source steel cylinder entering by pressure-reducing valve, mass flowmenter and check valve and the gas mixing tank
Gas port UNICOM, the gas outlet of the gas mixing tank are connected with one end of gas heating assembling device, the gas heating dress
The other end of device is connected by pipeline with one end of the fixed bed reactors, the other end of the fixed bed reactors and institute
State one end connection of gas cooler, the air inlet UNICOM of the other end of the gas cooler and the exhaust fan；It is described
The both ends of fixed bed reactors are provided with gas sampling mouth；The steam device that reacts passes through pipeline and the gas heating dress dress
Put the pipeline UNICOM with fixed bed reactors.
Further, the fixed bed reactors Inner is provided with honeycomb fashion cordierite-base catalyst, and its aperture is 1-5mm.
Further, the number of the fixed bed reactors is at least one.
Further, the gas heating dress includes housing, heat-insulation layer, U-shaped heating tube and heater,
Wherein, the both ends of the housing are respectively equipped with air inlet and gas outlet, and the inside of the housing is provided with heat-insulation layer, if
Do the U-shaped heating tube and be provided with the enclosure interior, the heater is connected with some U-shaped heating tubes.
The beneficial effects of the invention are as follows：Due to being coated using above-mentioned technical proposal, the inventive method using infusion process, technique
Simply, energy consumption is low, has good application prospect.After supported catalyst, honeycomb cordierite specific surface area dramatically increases, activearm
Divide and be evenly distributed in carrier surface.Handled by concussion, it is found that active component and carrier is combined closely.Meanwhile Mn-CeO2/
Al2O3Catalyst raw material is easy to get, nonhazardous effect, and manufacturing cycle is shorter.The temperature in use of existing denitrating catalyst is 300-
400 DEG C, the low temperature SCR denitration catalyst prepared by the present invention, when temperature in use is 100 DEG C, you can ensure 80% denitration
Efficiency, and it is passed through SO2、H2O behind efficiencies are stable 65%, with preferable anti-poisoning capability.Therefore this can be urged magnificent agent to use
After desulfurization, dedusting, dust and toxic action of the sulfur dioxide to catalyst are avoided, extends the service life of catalyst, carries
The high service life of catalyst.
Brief description of the drawings
Fig. 1 is a kind of structural representation of honeycomb fashion low-temperature denitration device of the present invention.
In figure：
Embodiment：
The present invention is specifically described below by examples of implementation, to allow those skilled in the art more preferable
The understanding present invention, but protection scope of the present invention is not limited to following embodiments.
As shown in figure 1, a kind of honeycomb fashion low-temperature denitration device of the present invention, the denitrification apparatus include carrier gas source steel cylinder, gas
Blending tank, gas heating dress, steam react device, fixed bed reactors, gas cooler and exhaust fan；
Wherein, the carrier gas source steel cylinder entering by pressure-reducing valve, mass flowmenter and check valve and the gas mixing tank
Gas port UNICOM, the gas outlet of the gas mixing tank are connected with one end of gas heating assembling device, the gas heating dress
The other end of device is connected by pipeline with one end of the fixed bed reactors, the other end of the fixed bed reactors and institute
State one end connection of gas cooler, the air inlet UNICOM of the other end of the gas cooler and the exhaust fan；It is described
The both ends of fixed bed reactors are provided with gas sampling mouth；The steam device that reacts passes through pipeline and the gas heating dress dress
Put the pipeline UNICOM with fixed bed reactors.
Further, the fixed bed reactors Inner is provided with honeycomb fashion cordierite-base catalyst, and its aperture is 1-5mm.
Further, the number of the fixed bed reactors is at least one.
Further, the gas heating dress includes housing, heat-insulation layer, U-shaped heating tube and heater,
Wherein, the both ends of the housing are respectively equipped with air inlet and gas outlet, and the inside of the housing is provided with heat-insulation layer, if
Do the U-shaped heating tube and be provided with the enclosure interior, the heater is connected with some U-shaped heating tubes.
The method that low-temperature denitration is carried out using said apparatus, this method specifically include following steps：
First, oxygen, nitrogen, carbon dioxide, carbon monoxide and nitric oxide gas are mixed according to certain ratio, and
Preheated；
Secondly, the mixed gas after preheating and ammonia are mixed according to certain ratio, by mixed gas according to one
Fixed flow carries out catalytic denitration processing by the fixed bed reactors provided with cellular catalyst；
Finally, gas after treatment is discharged after supercooling by exhaust fan.
Further, the temperature of the preheating is 80-200 DEG C.
Further, the flow is 5-100m3/h。
Further, the cellular catalyst layer is by Mn-CeO2/Al2O3Catalyst powder is made, the percentage of each component
For Mn：10%-30%, Ce：60%-85%, Al：5%-20%.
Further, it is described prepare honeycomb cordierite denitrating catalyst preparation technology be：Using deionized water as solvent, weigh
A certain amount of aluminum soluble salt, soluble cerium salt and soluble manganese salt are dissolved in deionized water respectively, stir 1.8-2.2h；
Then 15%-45% ammoniacal liquor stirring is added dropwise in mixed liquor, until pH=8-10, continues to stir 1-3h,
It is unchanged to pH with deionized water rinsing after still aging 10-15h；
Finally in moving air atmosphere, temperature dries 10-15h under the conditions of being 100-120 DEG C, is 400-600 in temperature
DEG C calcining 1-5h, be cooled to room temperature, obtain Mn-CeO2/Al2O3Catalyst powder；
Polyvinyl alcohol (PVA), emulsifier op-10 are added in deionized water, 0.5-5h is stirred, obtains creamy paste
Liquid, it is slowly added to Mn-CeO2/Al2O3Powder, stir 0.5-3h.Honeycomb cordierite catalyst carrier is finally immersed in catalyst
In slurry, aperture blowing, calcining, described low-temperature denitration catalyst is obtained.
Embodiment 1
Catalyst activity evaluation catalyst usage amount is 4 pieces of 100mm × 100mm × 150mm honeycomb cordierite base catalyst,
Reacted in fixed bed reactors, flow is controlled by mass flowmenter, and reaction condition is [NH3]/[NO]=1, NO amount is
200ppm, NH3=200ppm, flow 10m3/h.Tested according to temperature below gradient, specific data are as follows：
| Temperature DEG C | 90 | 100 | 110 | 120 |
| Denitration efficiency | 73.6% | 83% | 87.6% | 92.9% |
Embodiment 2
Catalyst activity evaluation catalyst usage amount is 4 pieces of 100mm × 100mm × 150mm honeycomb cordierite base catalyst,
Reacted in fixed bed reactors, flow is controlled by mass flowmenter, and reaction condition is [NH3]/[NO]=1, NO amount is
200ppm, NH3=200ppm.Under the conditions of 100 DEG C of temperature, change air speed by changing flue gas flow, flue gas flow changes such as
It is as a result as follows with Gradient：
Embodiment 3
Catalyst activity evaluation catalyst usage amount is 4 pieces of 100mm × 100mm × 150mm honeycomb cordierite base catalyst,
Reacted in fixed bed reactors, flow is controlled by mass flowmenter, and reaction condition is 100 DEG C of temperature, and NO amount is
200ppm, flow 10m3/ h,.Change [NH3]/[NO] ratio, NO removal efficiencies are determined by flue gas analyzer.Between under the conditions of each
Every 5 data of survey.As a result it is as follows：
| [NH3]/[NO] | 0.9 | 1.0 | 1.1 |
| Denitration efficiency | 71.5% | 83% | 78.6% |
Embodiment 4
Catalyst activity evaluation catalyst usage amount is 4 pieces of 100mm × 100mm × 150mm honeycomb cordierite base catalyst,
Reacted in fixed bed reactors, flow is controlled by mass flowmenter, and reaction condition is 100 DEG C of temperature, [NH3]/[NO]=
1, flow 10m3/h.Change NO concentration, it is as a result as follows：
| NO concentration | 100ppm | 150ppm | 200ppm | 300ppm |
| Denitration efficiency | 78.4% | 79.1% | 81.3% | 79.6% |
Embodiment 5
Catalyst activity evaluation catalyst usage amount is 4 pieces of 100mm × 100mm × 150mm honeycomb cordierite base catalyst,
Aperture is respectively 1mm, 1.5mm, 2mm, 5mm, is reacted in fixed bed reactors, and flow is controlled by mass flowmenter, reaction
Condition is 100 DEG C of temperature, and NO amount is 200ppm, NH3=200ppm, [NH3]/[NO]=1, flow 10m3/h.Change honeycomb
Cordierite aperture, it is as a result as follows：
。
Claims (10)
- A kind of 1. method of honeycomb fashion low-temperature denitration, it is characterised in that this method specifically includes following steps：First, oxygen, nitrogen, carbon dioxide, carbon monoxide and nitric oxide gas are mixed according to certain ratio, and carried out Preheating；Secondly, the mixed gas after preheating and ammonia are mixed according to certain ratio, by mixed gas according to certain Flow carries out catalytic denitration processing by the fixed bed reactors provided with cellular catalyst；Finally, gas after treatment is discharged after supercooling by exhaust fan.
- 2. according to the method for claim 1, it is characterised in that the temperature of the preheating is 80-200 DEG C.
- 3. according to the method for claim 1, it is characterised in that the flow is 5-100m3/h。
- 4. according to the method for claim 1, it is characterised in that the cellular catalyst layer is by Mn-CeO2/Al2O3Catalysis Agent powder is made, and the percentage of each component is Mn：10%-30%, Ce：60%-85%, Al：5%-20%.
- 5. according to the method for claim 4, it is characterised in that the preparation work for preparing honeycomb cordierite denitrating catalyst Skill is：Using deionized water as solvent, weigh a certain amount of aluminum soluble salt, soluble cerium salt and soluble manganese salt and be dissolved in respectively In deionized water, 1.8-2.2h is stirred；Then 15%-45% ammoniacal liquor stirring is added dropwise in mixed liquor, until pH=8-10, continues to stir 1-3h, stands It is unchanged to pH with deionized water rinsing after ageing 10-15h；Finally in moving air atmosphere, temperature dries 10-15h under the conditions of being 100-120 DEG C, and being 400-600 DEG C in temperature forges 1-5h is burnt, room temperature is cooled to, obtains Mn-CeO2/Al2O3Catalyst powder；Polyvinyl alcohol (PVA), emulsifier op-10 are added in deionized water, 0.5-5h is stirred, obtains milky slurries, is delayed It is slow to add Mn-CeO2/Al2O3Powder, stir 0.5-3h.Honeycomb cordierite catalyst carrier is finally immersed in catalyst slurry In, aperture blowing, calcining, obtain described low-temperature denitration catalyst.
- A kind of 6. honeycomb fashion low-temperature denitration device, it is characterised in that the denitrification apparatus include carrier gas source steel cylinder, gas mixing tank, Gas heating dress, steam react device, fixed bed reactors, gas cooler and exhaust fan；Wherein, the carrier gas source steel cylinder passes through pressure-reducing valve, mass flowmenter and check valve and the air inlet of the gas mixing tank UNICOM, the gas outlet of the gas mixing tank are connected with one end of gas heating assembling device, and the gas heats assembling device The other end be connected by pipeline with one end of the fixed bed reactors, the other end of the fixed bed reactors and the gas One end connection of body cooler, the air inlet UNICOM of the other end of the gas cooler and the exhaust fan；The fixation The both ends of bed reactor are provided with gas sampling mouth；The steam react device by pipeline and the gas heat assembling device and The pipeline UNICOM of fixed bed reactors.
- 7. device according to claim 6, it is characterised in that the fixed bed reactors Inner is provided with honeycomb fashion cordierite-base Catalyst block, its aperture are 1-5mm.
- 8. device according to claim 6, it is characterised in that the number of the fixed bed reactors is at least one.
- 9. device according to claim 6, it is characterised in that gas heating dress includes housing, heat-insulation layer, U-shaped added Heat pipe and heater,Wherein, the both ends of the housing are respectively equipped with air inlet and gas outlet, and the inside of the housing is provided with heat-insulation layer, Ruo Gansuo State U-shaped heating tube and be provided with the enclosure interior, the heater is connected with some U-shaped heating tubes.
- 10. device according to claim 6, it is characterised in that the carrier gas source steel cylinder includes oxygen bottle, nitrogen steel Bottle, carbon dioxide steel cylinder, carbon monoxide steel cylinder and nitric oxide steel cylinder, the oxygen bottle, nitrogen cylinder, titanium dioxide carbon steel Battery valve, pressure-reducing valve and flowmeter are provided with the bottleneck of bottle, carbon monoxide steel cylinder and nitric oxide steel cylinder.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711215701.7A CN107855002A (en) | 2017-11-28 | 2017-11-28 | A kind of method and its device of honeycomb fashion low-temperature denitration |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201711215701.7A CN107855002A (en) | 2017-11-28 | 2017-11-28 | A kind of method and its device of honeycomb fashion low-temperature denitration |
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| CN107855002A true CN107855002A (en) | 2018-03-30 |
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| CN (1) | CN107855002A (en) |
Cited By (3)
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| CN110721673A (en) * | 2019-09-12 | 2020-01-24 | 华中科技大学 | Mn-Ce/Al2O3Cordierite low-temperature denitration catalyst and preparation method thereof |
| CN112191098A (en) * | 2020-09-30 | 2021-01-08 | 江苏扬子催化剂有限公司 | Low-temperature denitration granular catalyst and honeycomb catalyst series-parallel combined reaction process |
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Application publication date: 20180330 |