CN109078488A - A kind of method of catalytic denitration - Google Patents
A kind of method of catalytic denitration Download PDFInfo
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- CN109078488A CN109078488A CN201810991373.8A CN201810991373A CN109078488A CN 109078488 A CN109078488 A CN 109078488A CN 201810991373 A CN201810991373 A CN 201810991373A CN 109078488 A CN109078488 A CN 109078488A
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- 230000003197 catalytic Effects 0.000 title claims abstract description 40
- 238000006243 chemical reaction Methods 0.000 claims abstract description 76
- 239000003054 catalyst Substances 0.000 claims abstract description 48
- QGZKDVFQNNGYKY-UHFFFAOYSA-N ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims abstract description 34
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 claims abstract description 17
- CBENFWSGALASAD-UHFFFAOYSA-N ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 claims abstract description 15
- 239000002245 particle Substances 0.000 claims abstract description 14
- 238000000034 method Methods 0.000 claims abstract description 9
- 239000007789 gas Substances 0.000 claims description 21
- 239000002912 waste gas Substances 0.000 claims description 20
- 238000010438 heat treatment Methods 0.000 claims description 14
- 239000012495 reaction gas Substances 0.000 claims description 14
- QIQXTHQIDYTFRH-UHFFFAOYSA-N Stearic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 claims description 12
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 11
- 238000005367 electrostatic precipitation Methods 0.000 claims description 10
- 239000007787 solid Substances 0.000 claims description 10
- 238000010792 warming Methods 0.000 claims description 8
- 229920002134 Carboxymethyl cellulose Polymers 0.000 claims description 6
- 229920001131 Pulp (paper) Polymers 0.000 claims description 6
- 235000021355 Stearic acid Nutrition 0.000 claims description 6
- GNTDGMZSJNCJKK-UHFFFAOYSA-N Vanadium(V) oxide Chemical compound O=[V](=O)O[V](=O)=O GNTDGMZSJNCJKK-UHFFFAOYSA-N 0.000 claims description 6
- QGZKDVFQNNGYKY-UHFFFAOYSA-O ammonium Chemical compound [NH4+] QGZKDVFQNNGYKY-UHFFFAOYSA-O 0.000 claims description 6
- UNTBPXHCXVWYOI-UHFFFAOYSA-O azanium;oxido(dioxo)vanadium Chemical compound [NH4+].[O-][V](=O)=O UNTBPXHCXVWYOI-UHFFFAOYSA-O 0.000 claims description 6
- 239000001768 carboxy methyl cellulose Substances 0.000 claims description 6
- 235000010948 carboxy methyl cellulose Nutrition 0.000 claims description 6
- 239000008112 carboxymethyl-cellulose Substances 0.000 claims description 6
- 239000008367 deionised water Substances 0.000 claims description 6
- KARVSHNNUWMXFO-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane;hydrate Chemical compound O.O=[Si]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O.O=[Al]O[Al]=O KARVSHNNUWMXFO-UHFFFAOYSA-N 0.000 claims description 6
- HZAXFHJVJLSVMW-UHFFFAOYSA-N ethanolamine Chemical compound NCCO HZAXFHJVJLSVMW-UHFFFAOYSA-N 0.000 claims description 6
- 239000003365 glass fiber Substances 0.000 claims description 6
- JVTAAEKCZFNVCJ-UHFFFAOYSA-N lactic acid Chemical compound CC(O)C(O)=O JVTAAEKCZFNVCJ-UHFFFAOYSA-N 0.000 claims description 6
- 239000004310 lactic acid Substances 0.000 claims description 6
- 235000014655 lactic acid Nutrition 0.000 claims description 6
- 229910052901 montmorillonite Inorganic materials 0.000 claims description 6
- 239000008117 stearic acid Substances 0.000 claims description 6
- 239000004408 titanium dioxide Substances 0.000 claims description 6
- 239000003795 chemical substances by application Substances 0.000 claims description 2
- 229920003171 Poly (ethylene oxide) Polymers 0.000 claims 1
- 238000005516 engineering process Methods 0.000 abstract description 9
- 239000000428 dust Substances 0.000 abstract description 4
- 230000000694 effects Effects 0.000 abstract description 4
- 230000000903 blocking Effects 0.000 abstract description 3
- 230000000607 poisoning Effects 0.000 abstract description 3
- 231100000572 poisoning Toxicity 0.000 abstract description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 14
- 230000005686 electrostatic field Effects 0.000 description 10
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 10
- JCXJVPUVTGWSNB-UHFFFAOYSA-N nitrogen dioxide Chemical compound O=[N]=O JCXJVPUVTGWSNB-UHFFFAOYSA-N 0.000 description 10
- 229910052757 nitrogen Inorganic materials 0.000 description 7
- 239000002202 Polyethylene glycol Substances 0.000 description 5
- 239000004568 cement Substances 0.000 description 5
- 229920001223 polyethylene glycol Polymers 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 3
- 238000010248 power generation Methods 0.000 description 2
- 229910002089 NOx Inorganic materials 0.000 description 1
- 231100000614 Poison Toxicity 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000003916 acid precipitation Methods 0.000 description 1
- 150000001450 anions Chemical class 0.000 description 1
- 150000001768 cations Chemical class 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 230000019771 cognition Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 239000003595 mist Substances 0.000 description 1
- 230000001699 photocatalysis Effects 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000004642 transportation engineering Methods 0.000 description 1
- 239000002699 waste material Substances 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
- B01D53/14—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 by absorption
-
- 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
- B01D53/14—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 by absorption
- B01D53/18—Absorbing units; Liquid distributors therefor
-
- 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
- B01J31/00—Catalysts comprising hydrides, coordination complexes or organic compounds
- B01J31/26—Catalysts comprising hydrides, coordination complexes or organic compounds containing in addition, inorganic metal compounds not provided for in groups B01J31/02 - B01J31/24
- B01J31/38—Catalysts comprising hydrides, coordination complexes or organic compounds containing in addition, inorganic metal compounds not provided for in groups B01J31/02 - B01J31/24 of titanium, zirconium or hafnium
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C3/00—Separating dispersed particles from gases or vapour, e.g. air, by electrostatic effect
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/10—Oxidants
- B01D2251/104—Ozone
-
- 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
- B01D2257/00—Components to be removed
- B01D2257/40—Nitrogen compounds
- B01D2257/406—Ammonia
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2258/00—Sources of waste gases
- B01D2258/02—Other waste gases
- B01D2258/0233—Other waste gases from cement factories
Abstract
The present invention provides a kind of methods of catalytic denitration, belong to environmentally friendly science and technology and environmental technology field.The method of catalytic denitration provided by the invention, nitrogenous exhaust gas is first passed through into dust removal process, the particle being avoided that in exhaust gas makes catalyst poisoning and blocking catalyst hole, then it by exhaust gas figure reaction kettle, is reacted with ammonia and ozone by catalyst, realizes the conversion of nitrogenous gas, then the ammonia of escape is absorbed by tail gas pond, reach discharge standard to be discharged, treatment effect is good, actual use value with higher.
Description
Technical field
The present invention relates to environmentally friendly science and technology and environmental technology fields, in particular to a kind of method of catalytic denitration.
Background technique
With the continuous improvement of national atmosphere pollutants emission standards, the cognition of haze harmfulness is deepened, NOx is as mist
The predecessor of haze, acid rain, discharge standard are possible to more stringent.The denitration technology that cement industry generallys use at present is low nitrogen
Burning, SNCR, and in order to cope with tighter discharge standard, it is necessary to increase SCR denitration on the basis of this denitration, realizes SNCR-
SCR combined denitration.Domestic cement industry is seldom to the research of SCR denitration technology, but SCR technology is widely used in Thermal Power Generation Industry.
Although the smoke transportation of the two has the dustiness of larger difference, especially cement industry to be much higher than Thermal Power Generation Industry, it is easy to make
It is blocked at catalyst dust stratification.
The denitration technology technique of cement industry is also immature at present, is badly in need of developing effective catalytic denitration technology.
Summary of the invention
The purpose of the present invention is to provide a kind of method of catalytic denitration, the efficient photocatalytic cements kiln exhaust gas of this method energy
Nitrogenous exhaust gas conversion, reaches discharge standard.
In order to realize above-mentioned purpose of the invention, using following technical scheme:
A kind of method of catalytic denitration, the method for catalytic denitration the following steps are included:
Nitrogenous exhaust gas is passed through into electrostatic precipitation processes, dust-removing waste gas is obtained, dust-removing waste gas is passed through in the reaction kettle of preheating；
It is passed through ammonia and ozone in a kettle and heats reaction, obtains reaction gas, reaction gas is passed through tail gas pond
Reaction.
Compared with prior art, the beneficial effect comprise that the method for catalytic denitration provided by the invention, will first contain
Nitrogen exhaust gas passes through dust removal process, and the particle being avoided that in exhaust gas makes catalyst poisoning and blocking catalyst hole, then will give up
It in gas figure reaction kettle, is reacted with ammonia and ozone by catalyst, realizes the conversion of nitrogenous gas, then pass through tail gas pond
The ammonia for absorbing escape, reaches discharge standard and is discharged, and treatment effect is good, actual use value with higher.
Specific embodiment
Embodiment of the present invention is described in detail below in conjunction with embodiment, but those skilled in the art will
Understand, the following example is merely to illustrate the present invention, and is not construed as limiting the scope of the invention.It is not specified in embodiment specific
Condition person carries out according to conventional conditions or manufacturer's recommended conditions.Reagents or instruments used without specified manufacturer is
The conventional products that can be obtained by commercially available purchase.
A kind of method of catalytic denitration of the embodiment of the present invention is specifically described below.
A kind of method of catalytic denitration, the method for catalytic denitration the following steps are included:
Nitrogenous exhaust gas is passed through into electrostatic precipitation processes, dust-removing waste gas is obtained, dust-removing waste gas is passed through in the reaction kettle of preheating；
It is passed through ammonia and ozone in a kettle and heats reaction, obtains reaction gas, reaction gas is passed through tail gas pond
Reaction.
The reaction principle of denitration catalyst is as follows:
4NO+4NH3+O2=4N2+6H2O；
2NO2+4NH3+O2=3N2+6H2O；
By the catalytic action of catalyst, so that the temperature of reaction reduces, nitric oxide or nitrogen dioxide and ammonia and prolong
Phase reaction generates harmless nitrogen and water, reaches the standard of processing exhaust gas.
Further, in preferred embodiments of the present invention, the operating voltage of electrostatic precipitation is 50-65kv.
Electrostatic precipitation is one kind of dedusting method.Dusty gas by being electrically isolated when high-voltage electrostatic field, grit with
In anion junction belt after negative electricity, tends to anode surface electric discharge and deposit.In the industry such as metallurgy, chemistry to purification gas or
Recycle useful grit.Make gas ionization using electrostatic field to make dust particles be adsorbed onto the collecting method on electrode.In forceful electric power
Air molecule is ionized as cation and electronics in, and electronics, which marches on towards, encounters grit in anode process, make the negatively charged absorption of grit
It is collected to anode.
Using higher voltage, play the effect of ionized air, the negative ions of air ionization and input it is to be processed
Charged particle in nitrogenous gas combines, and gradually reunites, achievees the purpose that dedusting.
Further, in preferred embodiments of the present invention, the concentration of solid particles of dust-removing waste gas is less than 20g/Nm3。
The concentration of solid particle in gas after controlling dedusting, avoids excessive concentration from influencing the use of catalyst.Due to urging
Agent has more hole, and solid particle is more, the hole of interests blocking catalyst, and the catalytic efficiency of catalyst is caused to drop
It is low；In addition, solid particle contains more poisonous and harmful substance, interests lead to catalyst poisoning, also will affect urging for catalyst
Change efficiency and plays the role of guard catalyst so needing to control the solid particle in gas.
Further, in preferred embodiments of the present invention, the temperature of preheating is 100-150 DEG C.
Further, in preferred embodiments of the present invention, the flow of ammonia is 1-2.5L/min.
The input of suitable ammonia flow is conducive to the progress of reaction, reasonably matches so that nitrogenous gas is formed with ammonia
Than；Not only it had been avoided that ammonia deficiency caused exhaust-gas treatment incomplete, but also has been avoided that the problem of peace input excessively leads to waste.
Further, in preferred embodiments of the present invention, the volume fraction of ozone is 5%-7%.
Further, in preferred embodiments of the present invention, heating reaction is that gradient-heated is reacted, gradient-heated reaction packet
Include warming up period, plateau and reaction phase.
Further, in preferred embodiments of the present invention, warming up period is heated to 120-160 DEG C, heating time 15-
20min；The time of plateau is 10-13min；The reaction phase is heated to 220-280 DEG C, heating time 10-15min.
It further, further include denitrating catalyst, denitrating catalyst master in reaction kettle in preferred embodiments of the present invention
Will by titanium dioxide, montmorillonite, ammonium paratungstate, vanadic anhydride, stearic acid, ammonium metavanadate, polyethylene glycol oxide, monoethanolamine,
Carboxymethyl cellulose, lactic acid, wood pulp and glass fibre and deionized water are prepared.
Further, in preferred embodiments of the present invention, the escape amount of ammonia is 3-8ppm.
Feature and performance of the invention are described in further detail with reference to embodiments.
Embodiment 1
The present embodiment provides a kind of method of catalytic denitration, catalytic denitration, which passes through in ability reaction kettle, adds denitrating catalyst,
It is reacted by denitrating catalyst and nitrogenous exhaust gas, generates the gas of environmental sound, reach discharge standard.
The reaction principle of denitration catalyst is as follows:
4NO+4NH3+O2=4N2+6H2O；
2NO2+4NH3+O2=3N2+6H2O；
By the catalytic action of catalyst, so that the temperature of reaction reduces, nitric oxide or nitrogen dioxide and ammonia and prolong
Phase reaction generates harmless nitrogen and water, reaches the standard of processing exhaust gas.
Denitrating catalyst, mainly by titanium dioxide, montmorillonite, ammonium paratungstate, vanadic anhydride, stearic acid, ammonium metavanadate,
Polyethylene glycol oxide, monoethanolamine, carboxymethyl cellulose, lactic acid, wood pulp and glass fibre and deionized water are prepared.
The method of denitration catalyst, comprising the following steps:
Nitrogenous exhaust gas is carried out electrostatic precipitation by 1.1 in electrostatic field, and the voltage of electrostatic field is 50kv；
1.2 obtain dust-removing waste gas, and the concentration of solid particles of dust-removing waste gas is less than 20g/Nm3；
1.3 preheating reaction kettles are to 100 DEG C；
1.4 are passed through dust-removing waste gas in the reaction kettle having been warmed up, while being passed through ammonia and ozone, and the flow of ammonia is
1L/min, the volume parts of ozone are 7%, and the escape amount for controlling ammonia is 3ppm；
1.5 reaction kettles start gradient-heated reaction, and gradient-heated reaction includes warming up period, plateau and reaction phase, preheating
Phase is heated to 120 DEG C, heating time 15min；The time of plateau is 10min；The reaction phase is heated to 220 DEG C, heating time
For 10min；Start to be reacted after being heated to 220 DEG C；
Reaction gas is obtained after 1.6 reactions, reaction gas is passed through tail gas pond.
Embodiment 2
The present embodiment provides a kind of method of catalytic denitration, catalytic denitration, which passes through in ability reaction kettle, adds denitrating catalyst,
It is reacted by denitrating catalyst and nitrogenous exhaust gas, generates the gas of environmental sound, reach discharge standard.
The reaction principle of denitration catalyst is as follows:
4NO+4NH3+O2=4N2+6H2O；
2NO2+4NH3+O2=3N2+6H2O；
By the catalytic action of catalyst, so that the temperature of reaction reduces, nitric oxide or nitrogen dioxide and ammonia and prolong
Phase reaction generates harmless nitrogen and water, reaches the standard of processing exhaust gas.
Denitrating catalyst, mainly by titanium dioxide, montmorillonite, ammonium paratungstate, vanadic anhydride, stearic acid, ammonium metavanadate,
Polyethylene glycol oxide, monoethanolamine, carboxymethyl cellulose, lactic acid, wood pulp and glass fibre and deionized water are prepared.
The method of denitration catalyst, comprising the following steps:
Nitrogenous exhaust gas is carried out electrostatic precipitation by 1.1 in electrostatic field, and the voltage of electrostatic field is 65kv；
1.2 obtain dust-removing waste gas, and the concentration of solid particles of dust-removing waste gas is less than 20g/Nm3；
1.3 preheating reaction kettles are to 150 DEG C；
1.4 are passed through dust-removing waste gas in the reaction kettle having been warmed up, while being passed through ammonia and ozone, and the flow of ammonia is
2.5L/min, the volume parts of ozone are 7%, and the escape amount for controlling ammonia is 8ppm；
1.5 reaction kettles start gradient-heated reaction, and gradient-heated reaction includes warming up period, plateau and reaction phase, preheating
Phase is heated to 160 DEG C, heating time 20min；The time of plateau is 13min；The reaction phase is heated to 280 DEG C, heating time
For 15min；It is persistently reacted after being heated to 280 DEG C；
Reaction gas is obtained after 1.6 reactions, reaction gas is passed through tail gas pond.
Embodiment 3
The present embodiment provides a kind of method of catalytic denitration, catalytic denitration, which passes through in ability reaction kettle, adds denitrating catalyst,
It is reacted by denitrating catalyst and nitrogenous exhaust gas, generates the gas of environmental sound, reach discharge standard.
The reaction principle of denitration catalyst is as follows:
4NO+4NH3+O2=4N2+6H2O；
2NO2+4NH3+O2=3N2+6H2O；
By the catalytic action of catalyst, so that the temperature of reaction reduces, nitric oxide or nitrogen dioxide and ammonia and prolong
Phase reaction generates harmless nitrogen and water, reaches the standard of processing exhaust gas.
Denitrating catalyst, mainly by titanium dioxide, montmorillonite, ammonium paratungstate, vanadic anhydride, stearic acid, ammonium metavanadate,
Polyethylene glycol oxide, monoethanolamine, carboxymethyl cellulose, lactic acid, wood pulp and glass fibre and deionized water are prepared.
The method of denitration catalyst, comprising the following steps:
Nitrogenous exhaust gas is carried out electrostatic precipitation by 1.1 in electrostatic field, and the voltage of electrostatic field is 55kv；
1.2 obtain dust-removing waste gas, and the concentration of solid particles of dust-removing waste gas is less than 20g/Nm3；
1.3 preheating reaction kettles are to 130 DEG C；
1.4 are passed through dust-removing waste gas in the reaction kettle having been warmed up, while being passed through ammonia and ozone, and the flow of ammonia is
2L/min, the volume parts of ozone are 6%, and the escape amount for controlling ammonia is 5ppm；
1.5 reaction kettles start gradient-heated reaction, and gradient-heated reaction includes warming up period, plateau and reaction phase, preheating
Phase is heated to 140 DEG C, heating time 17min；The time of plateau is 12min；The reaction phase is heated to 260 DEG C, heating time
For 13min；It is persistently reacted after being heated to 260 DEG C；
Reaction gas is obtained after 1.6 reactions, reaction gas is passed through tail gas pond.
Embodiment 4
The present embodiment provides a kind of method of catalytic denitration, catalytic denitration, which passes through in ability reaction kettle, adds denitrating catalyst,
It is reacted by denitrating catalyst and nitrogenous exhaust gas, generates the gas of environmental sound, reach discharge standard.
The reaction principle of denitration catalyst is as follows:
4NO+4NH3+O2=4N2+6H2O；
2NO2+4NH3+O2=3N2+6H2O；
By the catalytic action of catalyst, so that the temperature of reaction reduces, nitric oxide or nitrogen dioxide and ammonia and prolong
Phase reaction generates harmless nitrogen and water, reaches the standard of processing exhaust gas.
Denitrating catalyst, mainly by titanium dioxide, montmorillonite, ammonium paratungstate, vanadic anhydride, stearic acid, ammonium metavanadate,
Polyethylene glycol oxide, monoethanolamine, carboxymethyl cellulose, lactic acid, wood pulp and glass fibre and deionized water are prepared.
The method of denitration catalyst, comprising the following steps:
Nitrogenous exhaust gas is carried out electrostatic precipitation by 1.1 in electrostatic field, and the voltage of electrostatic field is 60kv；
1.2 obtain dust-removing waste gas, and the concentration of solid particles of dust-removing waste gas is less than 20g/Nm3；
1.3 preheating reaction kettles are to 150 DEG C；
1.4 are passed through dust-removing waste gas in the reaction kettle having been warmed up, while being passed through ammonia and ozone, and the flow of ammonia is
1.5L/min, the volume parts of ozone are 6%, and the escape amount for controlling ammonia is 7ppm；
1.5 reaction kettles start gradient-heated reaction, and gradient-heated reaction includes warming up period, plateau and reaction phase, preheating
Phase is heated to 150 DEG C, heating time 18min；The time of plateau is 11min；The reaction phase is heated to 270 DEG C, heating time
For 14min；It is persistently reacted after being heated to 270 DEG C；
Reaction gas is obtained after 1.6 reactions, reaction gas is passed through tail gas pond.
Experimental example 1
This experimental example carries out denitration catalyst processing in the method for the embodiment 1-4 catalytic denitration provided, and comparative example 1 is not to remove
The exhaust gas of dirt carries out denitration process (remaining is same as Example 1), and comparative example 2 is handled (its with 0.5L/min ammonia flow
It is remaining same as Example 1), comparative example 3 is reacted (remaining is same as Example 1) with the ammonia flow of 5L/min, is counted respectively
Calculate the service life and denitration efficiency of catalyst.Experimental result is shown in Table 1.
1 denitration experimental result of table
From table 1 can, the exhaust gas of non-dedusting significantly affects the service life and denitration efficiency of catalyst, and ammonia flow
The too small or excessive service life and denitration efficiency that also can all influence catalyst.
In conclusion the method for catalytic denitration provided in an embodiment of the present invention, when the use of extension catalyst that can be opposite
Between, opposite saving use cost simultaneously improves denitration efficiency, has higher practical application value and preferable promotion price
Value.
Embodiments described above is a part of the embodiment of the present invention, instead of all the embodiments.Reality of the invention
The detailed description for applying example is not intended to limit the range of claimed invention, but is merely representative of selected implementation of the invention
Example.Based on the embodiments of the present invention, obtained by those of ordinary skill in the art without making creative efforts
Every other embodiment, shall fall within the protection scope of the present invention.
Claims (10)
1. a kind of method of catalytic denitration, which is characterized in that the method for the catalytic denitration the following steps are included:
Nitrogenous exhaust gas is passed through into electrostatic precipitation processes, dust-removing waste gas is obtained, the dust-removing waste gas is passed through in the reaction kettle of preheating；
It is passed through ammonia and ozone in a kettle and heats reaction, obtains reaction gas, reaction gas is passed through the reaction of tail gas pond.
2. the method for catalytic denitration according to claim 1, which is characterized in that the operating voltage of the electrostatic precipitation is
50-65kv。
3. the method for catalytic denitration according to claim 2, which is characterized in that the concentration of solid particles of the dust-removing waste gas
Less than 20g/Nm3。
4. the method for catalytic denitration according to claim 2, which is characterized in that the temperature of the preheating is 100-150 DEG C.
5. the method for catalytic denitration according to claim 1, which is characterized in that the flow of the ammonia is 1-2.5L/
min。
6. the method for catalytic denitration according to claim 5, which is characterized in that the volume fraction of the ozone is 5%-
7%.
7. the method for catalytic denitration according to claim 1, which is characterized in that the heating reaction is that gradient-heated is anti-
It answers, the gradient-heated reaction includes warming up period, plateau and reaction phase.
8. the method for catalytic denitration according to claim 7, which is characterized in that the warming up period is heated to 120-160 DEG C,
Heating time is 15-20min；The time of the plateau is 10-13min；The reaction phase is heated to 220-280 DEG C, heating
Time is 10-15min.
9. the method for catalytic denitration according to claim 1, which is characterized in that further include denitration catalyst in the reaction kettle
Agent, the denitrating catalyst is mainly by titanium dioxide, montmorillonite, ammonium paratungstate, vanadic anhydride, stearic acid, ammonium metavanadate, poly-
Ethylene oxide, monoethanolamine, carboxymethyl cellulose, lactic acid, wood pulp and glass fibre and deionized water are prepared.
10. the method for catalytic denitration as described in claim 1, which is characterized in that the escape amount of the ammonia is 3-8ppm.
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