CN105833718A - Denitration system and denitration processing method of plasma synergistic catalyst - Google Patents
Denitration system and denitration processing method of plasma synergistic catalyst Download PDFInfo
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- CN105833718A CN105833718A CN201610232602.9A CN201610232602A CN105833718A CN 105833718 A CN105833718 A CN 105833718A CN 201610232602 A CN201610232602 A CN 201610232602A CN 105833718 A CN105833718 A CN 105833718A
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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
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- 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
- B01D53/32—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 electrical effects other than those provided for in group B01D61/00
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B01D2259/80—Employing electric, magnetic, electromagnetic or wave energy, or particle radiation
- B01D2259/818—Employing electrical discharges or the generation of a plasma
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Abstract
The invention provides a denitration system and denitration processing method of a plasma synergistic catalyst. The system includes a gas mixing system, a plasma reaction system, a fixed-bed catalytic reactor, an absorbing device, and an induced draft device, which are connected in sequence. The method comprises: introducing mixed to-be-processed flue gas and ammonia gas into a plasma reactor, performing streamer discharge under the action of high voltage to generate active substances, such as electrons, ions, and free radicals, and performing primary denitration; mixing the flue gas subjected to primary denitration with ammonia gas under the catalytic action of a catalyst, and reacting NOx in flue gas with ammonia gas to achieve denitration; and discharging tail gas after absorption. A synergistic effect between streamer discharge plasma and the low-temperature catalyst is utilized to remove nitric oxide from flue gas at a low temperature with low energy consumption. The inhibition of oxygen on nitric oxide removal is overcome, low-dust arrangement or tail arrangement of an SCR device is realized, and the life of the catalyst is prolonged.
Description
Technical field
The invention belongs to environmental technology field, relate to denitrating system and the processing method thereof of a kind of plasma body cooperative catalyst, particularly relate to a kind of denitrating system utilizing corona plasma synergistic catalyst and processing method thereof.
Background technology
Nitrogen oxides is the pollutant that in air, a class is common, and it is very big on the impact of environment, including forming haze, acid rain, photochemical fog and damaging the ozone layer.The nitrogen oxides that industry (especially coal-burning power plant) is discharged has accounted for the overwhelming majority of nitrogen oxide emission.At present, the relatively broad gas denitrifying technology of domestic and international application is selective catalytic reduction (SCR), commonly used vanadium Titanium series catalyst, such catalyst optimum temperature window is between 300～380 DEG C, therefore the industry commonly used high dirt of SCR denitration equipment is arranged, before SCR device is placed in electrostatic precipitator, so in flue gas, a large amount of flying dusts and washing away of dust are easily caused catalyst blockage and inactivation so that the actual motion activity of catalyst is difficult to meet the technological requirement of Large Scale Industrial Process with service life.
Lower temperature plasma technology is little with its floor space, technological process simple, course of reaction cleans and can remove the unique plurality of advantages such as multiple pollutant simultaneously, has become as the denitrating flue gas new technology of the most application prospect generally acknowledged in the world.CN 103736393A discloses the method for a kind of low temperature plasma removing nitrogen oxides, the pending waste gas of nitrogen-containing oxide is first passed through the reaction of low temperature plasma device equipped with adsorption catalyst and carries out catalytic adsorption enrichment by the method, stop when concentration reaches set objective value being passed through pending gas and carrying out plasma discharge, under the common effect of low temperature plasma and catalyst, absorption nitrogen oxides catalytic decomposition on a catalyst is become N2, catalyst is regenerated simultaneously, but the shortcoming that plasma is poor to pollutant selectivity and energy consumption is higher limits its commercial Application.
Summary of the invention
For the technical problem that discharge of plasma in low temperature energy consumption in prior art is higher, and business SCR catalyst height dirt arranges the shortcoming being easily caused catalyst blockage and inactivation at present, in order to improve the life-span of catalyst, arrange in conjunction with dirt low to SCR device or the research of tail end layout, the invention provides a kind of denitrating system utilizing corona plasma synergistic catalyst and processing method thereof.Plasma technique is applied in denitrating flue gas by described method, it is provided that one can realize low temperature low energy consumption removing flue gas NOxMethod.
For reaching this purpose, the present invention by the following technical solutions:
First aspect, the invention provides the denitrating system of a kind of plasma body cooperative catalyst, and described system includes gas mixing system, plasma reaction system, fixed bed catalytic reactor, absorption plant and the blower unit being sequentially connected.
As the preferred version of the present invention, described plasma reaction system includes plasma reactor and discharge power supply, and wherein discharge power supply is high voltage power supply, is particularly AC/DC alternating current-direct current superposition streamer-discahrge power supply.
Preferably, between plasma reactor and discharge power supply, it is provided with oscillograph, to be used for detecting the input of energy.
Preferably, described plasma reactor is line-barrel structure, and it includes central electrode and ground electrode, and ground electrode is that tubular is around central electrode.
Preferably, the central electrode of plasma reactor is connected with the positive pole of discharge power supply, and the ground electrode of plasma reactor is connected with the earthing pole of discharge power supply.
Preferably, the discharging gap of described central electrode and ground electrode is 3～30mm, such as 3mm, 5mm, 7mm, 10mm, 13mm, 15mm, 17mm, 20mm, 23mm, 25mm, 27mm or 30mm etc..
As the preferred version of the present invention, described central electrode is provided with pole piece.
Preferably, described pole piece is zigzag, and adjacent pole piece spacing is 15～30mm, such as 15mm, 17mm, 20mm, 23mm, 25mm, 27mm or 30mm etc..
Preferably, the material of described central electrode is any one or the combination of at least two in rustless steel, copper, titanium, ferrum, nickel or tungsten, the typical but non-limiting example of described combination has: rustless steel and the combination of copper, copper and the combination of the combination of the combination of tungsten, copper and titanium, titanium and ferrum, nickel and the combination of tungsten, the combination of rustless steel, copper, titanium and ferrum, the combination of rustless steel, copper and tungsten, the combination etc. of rustless steel, copper, titanium, ferrum, nickel and tungsten.
Preferably, a length of the 200 of described central electrode～500mm, such as 200mm, 250mm, 300mm, 350mm, 400mm, 450mm or 500mm etc..
Preferably, the material of described ground electrode is any one or the combination of at least two in rustless steel, copper, titanium, ferrum, nickel or tungsten, the typical but non-limiting example of described combination has: rustless steel and the combination of copper, copper and the combination of the combination of the combination of titanium, titanium and ferrum, nickel and tungsten, copper and the combination of tungsten, the combination of rustless steel, copper, titanium and ferrum, the combination of rustless steel, copper and tungsten, the combination etc. of rustless steel, copper, titanium, ferrum, nickel and tungsten.
Preferably, the internal diameter of described ground electrode is 25～75mm, such as 25mm, 30mm, 35mm, 40mm, 45mm, 50mm, 55mm, 60mm, 65mm, 70mm or 75mm etc..
Preferably, described discharge power supply is AC/DC alternating current-direct current superposition streamer-discahrge power supply.
Preferably, plasma reactor two ends are provided with insulation spacer and two ends with flange seal.
Preferably, one end of plasma reactor is provided with air inlet, and the other end is provided with gas outlet.
Preferably, the gas outlet of gas mixing system is connected with the air inlet of plasma reactor, and the gas outlet of plasma reactor is connected with the air inlet of fixed bed catalytic reactor.
As the preferred version of the present invention, outside described fixed bed catalytic reactor, it is cased with electric furnace.
Preferably, flue gas analyzer it is provided with between fixed bed catalytic reactor and absorption plant.
Preferably, the middle part of fixed bed catalytic reactor is equipped with denitrating catalyst.
Preferably, the catalytic temperature of described denitrating catalyst is 130～350 DEG C, and such as 130 DEG C, 150 DEG C, 170 DEG C, 200 DEG C, 230 DEG C, 250 DEG C, 270 DEG C, 300 DEG C, 330 DEG C or 350 DEG C etc., the catalyst process in this device belongs to low temperature catalytic processes.
Preferably, described denitrating catalyst is MnOx-CeO2/TiO2Catalyst, V2O5-MnOx-CeO2/TiO2Catalyst or CuO-MnOx/TiO2Any one or the combination of at least two in catalyst, described combination typical case but limiting examples have: MnOx-CeO2/TiO2Catalyst and V2O5-MnOx-CeO2/TiO2The combination of catalyst, V2O5-MnOx-CeO2/TiO2Catalyst and CuO-MnOx/TiO2The combination of catalyst, MnOx-CeO2/TiO2Catalyst, V2O5-MnOx-CeO2/TiO2Catalyst and CuO-MnOx/TiO2The combination etc. of catalyst.
As the preferred version of the present invention, described gas mixing system includes gas storage, mass flow instrument and the gas mixer being sequentially connected.
Preferably, it is provided with air relief valve between described gas storage and mass flow instrument.
Second aspect, the invention provides the denitration processing method of a kind of plasma body cooperative catalyst, and described method is:
(1) pending flue gas generate electronics, ion and active substance through streamer-discahrge after mixing, carry out preliminary denitration；
(2) under the catalytic action of catalyst, carry out further denitration with ammonia after the flue gas after preliminary denitration mixes；
(3) flue gas after further denitration carries out absorbing and discharging.
Wherein, in step (1) pending flue gas generate electronics, ion and free radical isoreactivity material through streamer-discahrge after mixing so that part NO is reduced；In step (2), the flue gas after preliminary denitration mixes the NO that can make to make under the effect of catalyst in flue gas with ammoniaxReact with ammonia.
As the preferred version of the present invention, the flow of described pending flue gas is 0.5～2.0L/min, such as 0.5L/min, 0.7L/min, 1.0L/min, 1.3L/min, 1.5L/min, 1.7L/min or 2.0L/min etc..
Preferably, in described pending flue gas, the volume content of oxygen is 3～7%, such as 3%, 4%, 5%, 6% or 7% etc..
Preferably, in described step (1), the power of streamer-discahrge is 2～25W, such as 2W, 5W, 7W, 10W, 13W, 15W, 17W, 20W, 23W or 25W etc..
Preferably, the catalytic temperature in described step (2) is 130～350 DEG C, such as 130 DEG C, 150 DEG C, 170 DEG C, 200 DEG C, 230 DEG C, 250 DEG C, 270 DEG C, 300 DEG C, 330 DEG C or 350 DEG C etc..
Adding ammonia in described step (1) in pending flue gas, the ammonia amount of its addition and the volume ratio of nitrogen oxides in effluent content are 1:(2～1), such as 1:2,1:1.7,1:1.5,1:1.3 or 1:1 etc.；Adding ammonia in pending flue gas can make corona plasma for NO effect based on reduction process, reduces NO2Generation.
Preferably, the consumption of ammonia carrying out with flue gas in described step (2) mixing is 1:(2～1 with the volume ratio of nitrogen oxides in effluent content), such as 1:2,1:1.7,1:1.5,1:1.3 or 1:1 etc..
As the preferred version of the present invention, in step (1), being blended in gas mixing system of pending flue gas is carried out.
Preferably, in step (1), streamer-discahrge is carried out in plasma reaction system.
Preferably, the catalytic process in step (2) is carried out in fixed bed catalytic reactor.
Preferably, in step (3), the absorption of flue gas is carried out in absorption plant.
Preferably, in step (3), flue gas is discharged by air-introduced machine.
As the preferred version of the present invention, the processing method of the denitrification apparatus of described plasma body cooperative catalyst is:
(1) pending flue gas in gas mixing system, in plasma reaction system, under the discharge power of 2～25W, generate electronics, ion and active substance through streamer-discahrge after mixing, carry out preliminary denitration；
(2) flue gas after preliminary denitration carries out further denitration in 130～350 DEG C under the catalytic action of catalyst in fixed bed catalytic reactor；
(3) flue gas after further denitration carries out absorbing and being discharged by air-introduced machine in absorption plant.
Compared with prior art, the method have the advantages that
(1) present invention is by the synergism of plasma with catalyst, the removal effect of the nitrogen oxides of about 95% can be reached in the range of 130～350 DEG C, the low dirt that can realize SCR device is arranged or tail end layout, avoid the dust in flue gas catalyst is washed away and blocks, be conducive to improving the life-span of catalyst.
(2) present invention is by the method adding ammonia pre-in flue gas, makes corona plasma for NO effect based on reduction process, reduces NO2Generation, and removal of nitrogen oxide effect breaches the inhibitory action of oxygen, in the range of oxygen content 3～7%, is attained by the removal of nitrogen oxide rate of about 95%.
Accompanying drawing explanation
Fig. 1 is the structural representation of the denitrating system of plasma body cooperative catalyst of the present invention；
Fig. 2 is the structural representation of the denitrating system plasma reactor of plasma body cooperative catalyst of the present invention；
Fig. 3 be plasma body cooperative catalyst of the present invention denitrating system plasma reactor in the structural representation of pole piece；
Wherein, 1-reacts gas cylinder, 2-air relief valve, 3-mass flow instrument, 4-gas mixer, 5-plasma reactor, 6-discharge power supply, 7-hot plate, 8-fixed bed catalytic reactor, 9-flue gas analyzer, 10-absorption plant, 11-air-introduced machine.
Detailed description of the invention
Below in conjunction with several specific embodiments; exemplary illustration and help are further appreciated by the present invention; but embodiment detail is merely to illustrate the present invention; do not represent whole technical schemes under present inventive concept; therefore should not be construed as the technical scheme to the present invention is total to limit, some are changed at technical staff, the unsubstantiality without departing from inventive concept; such as simply change or replace having the technical characteristic of same or similar technique effect, all belonging to scope.
Embodiment 1:
As it is shown in figure 1, present embodiments provide the denitrating system of a kind of plasma body cooperative catalyst, described system includes gas mixing system, plasma reaction system, fixed bed catalytic reactor 8, absorption plant 10 and the blower unit 11 being sequentially connected.Described plasma reaction system includes plasma reactor 5 and discharge power supply 6；Oscillograph 12 it is provided with between plasma reactor 5 and discharge power supply 6.
Plasma reactor 5 is line-barrel structure, as in figure 2 it is shown, it includes central electrode 13 and ground electrode 14, ground electrode 14 is cincture central electrode 13 in tubular；Central electrode 13 is connected with the positive pole of discharge power supply 6, and ground electrode 14 is connected with the earthing pole of discharge power supply 6, and the discharging gap of central electrode 13 and ground electrode 14 is 18.5mm；Central electrode 13 is provided with pole piece 15, and pole piece 15 is zigzag (as shown in Figure 3), and adjacent pole piece 15 spacing is 22mm；Central electrode 13 is stainless steel, a length of 300mm；Ground electrode 14 is stainless steel, and internal diameter is 55mm；Discharge power supply 6 is AC/DC alternating current-direct current superposition streamer-discahrge power supply.
Plasma reactor 5 two ends are provided with insulation spacer 18 and two ends and seal with flange 19；One end of plasma reactor 5 is provided with air inlet 16, and the other end is provided with gas outlet 17.
Fixed bed catalytic reactor 8 is outside is cased with electric furnace 7, is provided with flue gas analyzer 9 between fixed bed catalytic reactor 8 and absorption plant 10, and the middle part of fixed bed catalytic reactor 6 is equipped with denitrating catalyst MnOx-CeO2/TiO2Catalyst, its catalytic temperature is 150 DEG C.
Gas mixing system includes gas storage 1, mass flow instrument 3 and the gas mixer 4 being sequentially connected, air relief valve 2 it is provided with between gas storage 1 and mass flow instrument 3, the gas outlet of gas mixer 4 is connected with the air inlet 16 of plasma reactor 5, and the gas outlet 17 of plasma reactor 5 is connected with the air inlet of fixed bed catalytic reactor 8.
The denitration using said system to carry out flue gas processes, and specifically comprises the following steps that
(1) preparing pending flue gas: mixed with air and nitrogen by nitric oxide, mixed flue gas flow is 1.0L/min, and oxygen volume content is 3%, NO concentration 500ppm, pre-interpolation 500ppm ammonia in flue gas upon mixing.
(2) pending flue gas is entered in plasma reactor 5 after gas mixer 4 mixes, its discharge power is 9.92W, under high pressure effect, produce streamer-discahrge generate electronics, ion and free radical isoreactivity material so that part NO is reduced, and carries out preliminary denitration；
(3) after the flue gas after preliminary denitration mixes with the ammonia of 500ppm, entrance fix bed catalyst reactor 8 carries out catalytic reaction, and catalytic temperature is 150 DEG C, under the catalytic action of catalyst, makes the NO in flue gasxReact with ammonia, reach the purpose of denitration, after reaction, detect that the removal efficiency of nitrogen oxides is 93.54%.
(4) flue gas after further denitration is absorbed by absorption plant 10 and is discharged by air-introduced machine 11.
Embodiment 2:
In the present embodiment except in the pending flue gas of preparation in step (1) oxygen volume content be 5%, the structure and layout of other devices, and processing procedure is the most in the same manner as in Example 1, detects that the removal efficiency of nitrogen oxides is 94.21% after reaction.
Embodiment 3:
In the present embodiment except in the pending flue gas of preparation in step (1) oxygen volume content be 7%, the structure and layout of other devices, and processing procedure is the most in the same manner as in Example 1, detects that the removal efficiency of nitrogen oxides is 96.33% after reaction.
Embodiment 4:
In the denitrating system of the plasma body cooperative catalyst that the present embodiment uses, except central electrode 13 and ground electrode 14 are titanium material, denitrating catalyst is V2O5-MnOx-CeO2/TiO2Outside catalyst, other structures are the most in the same manner as in Example 1.
The denitration using above-mentioned denitrating system to carry out flue gas processes, in processing procedure except in step (1) oxygen volume content be 7%, in step (2), discharge power is outside 9.84W, remaining step is the most in the same manner as in Example 1, detects that the removal efficiency of nitrogen oxides is 98.57% after reaction.
Embodiment 5:
In the denitrating system of the plasma body cooperative catalyst that the present embodiment uses, except the discharging gap of central electrode 13 and ground electrode 14 is 3mm, adjacent pole piece 15 spacing is 15mm, central electrode 13 is copper product, the a length of 200mm of central electrode 13, ground electrode 14 is copper product, and the internal diameter of ground electrode 14 is 25mm, the catalytic temperature of fixed bed catalytic reactor 8 is 130 DEG C, and denitrating catalyst is CuO-MnOx/TiO2Outside catalyst, other structures are the most in the same manner as in Example 1.
The denitrating system using embodiment carries out the denitration of flue gas and processes, except in step (1), flue gas flow is 0.5L/min, the ammonia amount of addition is 1000ppm (i.e. the volume ratio with nitrogen oxides in effluent content is 1:2), in step (2), discharge power is 2W, the consumption of ammonia carrying out with flue gas mixing is 1000ppm (i.e. the volume ratio with nitrogen oxides in effluent content is 1:2), in step (3), catalytic temperature is outside 130 DEG C, remaining step is the most in the same manner as in Example 1, detects that the removal efficiency of nitrogen oxides is 94.21% after reaction.
Embodiment 6:
In the denitrating system of the plasma body cooperative catalyst that the present embodiment uses, except the discharging gap of central electrode 13 and ground electrode 14 is 30mm, adjacent pole piece 15 spacing is 30mm, central electrode 13 is tungsten material, the a length of 500mm of central electrode 13, ground electrode 14 is tungsten material, and the internal diameter of ground electrode 14 is 75mm, the catalytic temperature of fixed bed catalytic reactor 8 is 350 DEG C, and denitrating catalyst is MnOx-CeO2/TiO2Catalyst, V2O5-MnOx-CeO2/TiO2Outside with the mixed catalyst of CuO-MnOx/TiO2, other structures are the most in the same manner as in Example 1.
The denitrating system using embodiment carries out the denitration of flue gas and processes, except in step (1), flue gas flow is 2.0L/min, the ammonia amount of addition is 750ppm (i.e. the volume ratio with nitrogen oxides in effluent content is 1:1.5), in step (2), discharge power is 25W, the consumption of ammonia carrying out with flue gas mixing is 750ppm (i.e. the volume ratio with nitrogen oxides in effluent content is 1:1.5), in step (3), catalytic temperature is outside 350 DEG C, remaining step is the most in the same manner as in Example 1, detects that the removal efficiency of nitrogen oxides is 90.36% after reaction.
Comparative example 1:
This comparative example uses following denitrating system to carry out denitration reaction, and described system includes gas mixing system, plasma reaction system, absorption plant 10 and the blower unit 11 being sequentially connected.Described gas mixing system and plasma reaction system structure are in the same manner as in Example 1.
Concrete process step is as follows:
(1) preparing pending flue gas: mixed with air and nitrogen by nitric oxide, mixed flue gas flow is 1.0L/min, and oxygen volume content is 3%, NO concentration 500ppm, pre-interpolation 500ppm ammonia in flue gas upon mixing.
(2) pending flue gas is entered in plasma reactor 5 after gas mixer 4 mixes, its discharge power is 9.92W, under high pressure effect, produce streamer-discahrge generate electronics, ion and free radical isoreactivity material, part NO is reduced, carrying out denitration, the flue gas after denitration is absorbed by absorption plant 10 and is discharged by air-introduced machine 11.
Removal efficiency nitrogen oxides being detected after reaction is 36%.
Comparative example 2:
This comparative example uses following denitrating system to carry out denitration reaction, and described system includes gas mixing system, fixed bed catalytic reactor 8, absorption plant 10 and the blower unit 11 being sequentially connected.The structure of described gas mixing system and fixed bed catalytic reactor 8 is in the same manner as in Example 1.
Concrete process step is as follows:
(1) preparing pending flue gas: mixed with air and nitrogen by nitric oxide, mixed flue gas flow is 1.0L/min, and oxygen volume content is 3%, NO concentration 500ppm, adds 500ppm ammonia in flue gas upon mixing.
(2) pending flue gas feeding fix bed catalyst reactor 8 being carried out catalytic reaction, catalytic temperature is 150 DEG C, under the catalytic action of catalyst, makes the NO in flue gasxReacting with ammonia, reach the purpose of denitration, the flue gas after denitration is absorbed by absorption plant 10 and is discharged by air-introduced machine 11.
Removal efficiency nitrogen oxides being detected after reaction is 50%.
Comparative example 3:
In addition to adding ammonia the most in advance during preparing pending flue gas, the structure and layout of other devices, and processing procedure is the most in the same manner as in Example 1, removal efficiency nitrogen oxides being detected after reaction is 85%, it can be seen that add ammonia in pending flue gas and the efficiency of denitrating system can be made to improve further.
Comparative example 4:
Except adding ammonia the most in advance during preparing pending flue gas, and oxygen volume content is 5% in the pending flue gas prepared, the structure and layout of other devices, and processing procedure is the most in the same manner as in Example 1, detects that the removal efficiency of nitrogen oxides is 77% after reaction.
Comparative example 5:
Except adding ammonia the most in advance during preparing pending flue gas, and oxygen volume content is 7% in the pending flue gas prepared, the structure and layout of other devices, and processing procedure is the most in the same manner as in Example 1, detects that the removal efficiency of nitrogen oxides is 73% after reaction.
1-3 and comparative example 3-5 can be seen that in conjunction with the embodiments, in denitrification process, oxygen in flue gas is inhibited to the removing of nitrogen oxides, the present invention is by the method adding ammonia pre-in flue gas, the removal effect making nitrogen oxides breaches the inhibitory action of oxygen, in the range of oxygen content 3%～7%, remain to reach the removal of nitrogen oxide rate of about 95%.
The result of integrated embodiment 1-6 and comparative example 1-5 can be seen that, the present invention is by the synergism of plasma with catalyst, the removal effect of the nitrogen oxides of about 95% can be reached in the range of 130～350 DEG C, the low dirt that can realize SCR device is arranged or tail end layout, avoid the dust in flue gas catalyst is washed away and blocks, be conducive to improving the life-span of catalyst.Meanwhile, the present invention, by the method adding ammonia pre-in flue gas, makes corona plasma for NO effect based on reduction process, reduces NO2Generation, and removal of nitrogen oxide effect breaches the inhibitory action of oxygen, in the range of oxygen content 3～7%, is attained by the removal of nitrogen oxide rate of about 95%.
Claims (10)
1. the denitrating system of a plasma body cooperative catalyst, it is characterised in that described system includes depending on
Secondary connected gas mixing system, plasma reaction system, fixed bed catalytic reactor (8), absorption dress
Put (10) and blower unit (11).
Denitrating system the most according to claim 1, it is characterised in that described plasma reaction system
System includes plasma reactor (5) and discharge power supply (6)；
Preferably, oscillograph (12) it is provided with between plasma reactor (5) and discharge power supply (6)；
Preferably, described plasma reactor (5) is line-barrel structure, and it includes central electrode (13)
With ground electrode (14), ground electrode (14) is cincture central electrode (13) in tubular；
Preferably, the central electrode (13) of plasma reactor (5) and the positive pole of discharge power supply (6)
Being connected, the ground electrode (14) of plasma reactor (5) is connected with the earthing pole of discharge power supply (6)；
Preferably, the discharging gap of described central electrode (13) and ground electrode (14) is 3～30mm.
Denitrating system the most according to claim 2, it is characterised in that on described central electrode (13)
It is provided with pole piece (15)；
Preferably, described pole piece (15) is zigzag, and adjacent pole piece (15) spacing is 15～30mm；
Preferably, the material of described central electrode (13) is to appoint in rustless steel, copper, titanium, ferrum, nickel or tungsten
Anticipate a kind of or combination of at least two；
Preferably, a length of the 200～500mm of described central electrode (13)；
Preferably, the material of described ground electrode (14) is to appoint in rustless steel, copper, titanium, ferrum, nickel or tungsten
Anticipate a kind of or combination of at least two；
Preferably, the internal diameter of described ground electrode (14) is 25～75mm；
Preferably, described discharge power supply (6) is AC/DC alternating current-direct current superposition streamer-discahrge power supply；
Preferably, plasma reactor (5) two ends are provided with insulation spacer (18) and two ends with flange (19)
Seal；
Preferably, one end of plasma reactor (5) is provided with air inlet (16), and the other end is provided with
Gas outlet (17)；
Preferably, air inlet (16) phase of the gas outlet of gas mixing system and plasma reactor (5)
Even, the gas outlet (17) of plasma reactor (5) and the air inlet of fixed bed catalytic reactor (8)
It is connected.
4. according to the denitrating system described in Claims 2 or 3, it is characterised in that described fixed-bed catalytic is anti-
Device (8) outside is answered to be cased with electric furnace (7)；
Preferably, it is provided with flue gas analyzer between fixed bed catalytic reactor (8) and absorption plant (10)
(9)；
Preferably, the middle part of fixed bed catalytic reactor (8) is equipped with denitrating catalyst；
Preferably, the catalytic temperature of described denitrating catalyst is 130～350 DEG C；
Preferably, described denitrating catalyst is MnOx-CeO2/TiO2Catalyst,
V2O5-MnOx-CeO2/TiO2Catalyst or CuO-MnOx/TiO2Any one or at least two in catalyst
Combination.
5. according to the denitrating system described in any one of claim 1-4, it is characterised in that described gas mixes
System includes gas storage (1), mass flow instrument (3) and the gas mixer (4) being sequentially connected；
Preferably, air relief valve (2) it is provided with between described gas storage (1) and mass flow instrument (3).
6. the denitration processing method of a plasma body cooperative catalyst, it is characterised in that described method
For:
(1) pending flue gas generate electronics, ion and active substance through streamer-discahrge after mixing, enter
The preliminary denitration of row；
(2) carry out under the catalytic action of catalyst after the flue gas after preliminary denitration mixes with ammonia further
Denitration；
(3) flue gas after further denitration carries out absorbing and discharging.
Denitration processing method the most according to claim 6, it is characterised in that described pending flue gas
Flow be 0.5～2.0L/min；
Preferably, in described pending flue gas, the volume content of oxygen is 3～7%；
Preferably, in described step (1), the power of streamer-discahrge is 2～25W；
Preferably, the catalytic temperature in described step (2) is 130～350 DEG C.
8. according to the denitration processing method described in claim 6 or 7, it is characterised in that described step (1)
In pending flue gas adds ammonia, the ammonia amount of its addition and the volume ratio of nitrogen oxides in effluent content
For 1:(2～1)；
Preferably, described step (2) carries out the consumption of ammonia and the nitrogen oxides in effluent mixed with flue gas
The volume ratio of content is 1:(2～1).
9. according to the denitration processing method described in any one of claim 6-8, it is characterised in that step (1)
In being blended in gas mixing system of pending flue gas carry out；
Preferably, in step (1), streamer-discahrge is carried out in plasma reaction system；
Preferably, the catalytic process in step (2) is carried out in fixed bed catalytic reactor (8)；
Preferably, in step (3), the absorption of flue gas is carried out in absorption plant (10)；
Preferably, in step (3), flue gas is discharged by air-introduced machine (11).
10. according to the denitration processing method described in any one of claim 6-9, it is characterised in that described side
Method is:
(1) pending flue gas in gas mixing system after mixing in plasma reaction system in
Generate electronics, ion and active substance through streamer-discahrge under the discharge power of 2～25W, tentatively take off
Nitre；
(2) flue gas after preliminary denitration under the catalytic action of catalyst in fixed bed catalytic reactor (8)
In carry out further denitration in 130～350 DEG C；
(3) flue gas after further denitration carries out absorbing and by air-introduced machine (11) in absorption plant (10)
Discharge.
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| CN110252102A (en) * | 2019-07-16 | 2019-09-20 | 上海迪夫格环境科技有限公司 | A kind of width load method of denitration and device |
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