CN106823782B - A kind of anti-poisoning catalytic reaction system of low-temperature denitration of flue gas - Google Patents

A kind of anti-poisoning catalytic reaction system of low-temperature denitration of flue gas Download PDF

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CN106823782B
CN106823782B CN201710017412.XA CN201710017412A CN106823782B CN 106823782 B CN106823782 B CN 106823782B CN 201710017412 A CN201710017412 A CN 201710017412A CN 106823782 B CN106823782 B CN 106823782B
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catalyst
flue gas
metallic conductor
reaction system
low
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CN106823782A (en
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张深根
刘波
孙帅领
刘赓
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Jiangsu Longjing Kejie Environmental Protection Technology Co ltd
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University of Science and Technology Beijing USTB
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/86—Catalytic processes
    • B01D53/8621—Removing nitrogen compounds
    • B01D53/8625—Nitrogen oxides
    • B01D53/8631—Processes characterised by a specific device
    • 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
    • B03C3/34—Constructional details or accessories or operation thereof
    • B03C3/40—Electrode constructions
    • B03C3/45—Collecting-electrodes
    • B03C3/47—Collecting-electrodes flat, e.g. plates, discs, gratings
    • 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
    • B03C3/34—Constructional details or accessories or operation thereof
    • B03C3/66—Applications of electricity supply techniques
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2255/00—Catalysts
    • B01D2255/90—Physical characteristics of catalysts
    • B01D2255/902—Multilayered catalyst
    • 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
    • B01D2258/0283—Flue gases

Abstract

The invention belongs to field of environment protection, and in particular to a kind of anti-poisoning catalytic reaction system of low-temperature denitration of flue gas.Metallic conductor is fixed on top insulation fixed frame in the anti-poisoning catalytic reaction system of low-temperature denitration of flue gas of the present invention, and connection high-voltage DC power supply mould group the two poles of the earth form electric field, and are inserted in catalyst gap；It is plate shape below metallic conductor, adsorption area is larger, is mainly used to adsorb fine dust, top is bar shaped, the ammonium salt generated in primary attachment catalyst duct.The catalyst of multilayer removing nitrogen oxides is placed in system；The impurity adsorbed on metallic conductor is periodically removed using vibration device, so that it is fallen into lower section ash bucket, is improved adsorption efficiency.The present invention reduces impurity in the covering of catalyst surface, solves the problems, such as that low temperature catalyst is poisoned because of ammonium salt covering or catalyst sulfuric acid, energy high degree improves reactivity and the service life of low-temperature denitration of flue gas catalyst by Electrostatic Absorption impurity.

Description

A kind of anti-poisoning catalytic reaction system of low-temperature denitration of flue gas
Technical field
The invention belongs to field of environment protection, are suitable for boiler smoke and industrial tail gas dedusting and denitration process, specifically It is related to a kind of anti-poisoning catalytic reaction system of low-temperature denitration of flue gas.
Background technique
Industrial waste gas, especially NOx, sharply increasing for discharge amount, cause environmental pollution to get worse.Recently as ring Guaranteed request improves, and industrial gas emission standard is also more stringent.It is de- by selective catalytic reduction (SCR) flue gas of reducing agent of ammonia Nitre technology, catalyst are V mostly2O5/TiO2Or modified V2O5/TiO2, operating temperature is generally greater than 350 DEG C.Therefore, only SCR reactor can be arranged between economizer and deduster, to ensure to carry out denitration reaction in active section.But this section of flue gas Inclement condition, it is larger to catalyst impairment.
SCR low temperature catalyst is developed in recent years, can be disposed at after dedusting even desulfurizer, while avoiding to cigarette The Repeat-heating of gas saves operation and boiler improvement cost.But because of the still SO containing remnants in the flue gas after desulfurization2, point of sulphur ammonium salt Solution is suppressed when temperature is lower and constantly accumulates in catalyst surface, and low temperature catalyst is caused to be poisoned.
For low temperature catalyst poisoning problem, on May 29th, 2014 wishes that society people etc. have applied for that national inventing patent is " a kind of Sulfur resistive membrane type low-temperature denitration catalyst and preparation method thereof " (application number 201410234825.X).The catalyst of this method preparation With one layer of hydrophobic permeable membrane, ammonium salt can be obstructed in the deposition of catalyst surface, but dust, ammonium salt still can be heavy in film layer Product, can not solve poisoning problem at all.On October 27th, 2015, exhibition ancestor city etc. applied national inventing patent " a kind of dedusting and Denitrification integrated device " (application number 201510708983.9).The device reduces dusts to poison washing away for catalyst, but difficult To solve the problems, such as that catalyst is poisoned because of ammonium salt covering.It on October 3rd, 2016, thanks to high woods etc. and has applied for national inventing patent " a kind of anti-poisoning system of low-temperature denitration of flue gas " (application number 201610034742.5), by placing active carbon layer before catalyst Adsorbing contaminant is to reduce impurity to catalyst toxic action.This method assembly is simple, but need to frequently replace active carbon, flue gas pressure Drop is big, at high cost.Low temperature catalyst is solved by ammonium salt covering or poisons shadow in conclusion the prior art is all difficult to continuous and effective It rings.
Summary of the invention
In order to solve the above technical problem, the present invention provides a kind of anti-poisoning catalytic reaction systems of low-temperature denitration of flue gas, lead to Cross setting high-voltage DC power supply and metallic conductor Electrostatic Absorption impurity connected to it, reduce catalyst surface by ammonium salt and The covering of dust reduces active catalyst sites and is destroyed or occupies；It can be as more as possible by the intake of increasing ammonia Ground and sulfur dioxide generate sulphur ammonium salt, reduce catalyst by sulfur dioxide sulphation and cause irreversible poisoning, substantially increase Catalyst activity and service life.
The present invention is achieved by the following technical solutions:
A kind of anti-poisoning catalytic reaction system of low-temperature denitration of flue gas, the catalytic reaction system include shell, are fixed on shell The catalyst in internal portion, metallic conductor, high-voltage DC power supply, the insulation fixed frame of case top and positioned at housing bottom for shaking Move the vibration support frame of the metallic conductor；The metallic conductor includes plate shape end and bar shaped end, and the metallic conductor passes through institute It states plate shape end to connect with the high-voltage DC power supply and the vibration support frame, the bar shaped end of the metallic conductor passes through described Duct on catalyst is simultaneously connect with the insulation fixed frame.
Further, the shell is vertical Z-shaped, including being located at lower mouth and position of the housing bottom side for flue gas entrance In case top side for suitable for reading derived from flue gas, the lower mouth and the two sides opposite positioned at shell suitable for reading.
Further, the quantity of the metallic conductor is at least a, and the plate shape end of the metallic conductor is alternately sequentially connected with The anode and cathode of high-voltage DC power supply.
Further, the bar shaped end of the metallic conductor is wire, metal bar, sheet metal, prickle wire, astroid and saw Any one in tooth trace, the electrode spacing between two adjacent metallic conductors are 5-100mm.
Further, the high-voltage DC power supply voltage range is 1-100kV.
Further, the high-voltage DC power supply is set to the outside of the shell.
Further, the shape of the catalyst is any one in honeycomb, corrugated, plate and tubular, described The number of plies of catalyst is layer 2-4.
Further, the catalytic reaction system further includes the ash bucket for collecting impurity, and the ash bucket is set to described Vibrate the lower part of support frame.
Further, it vibrates on support frame deashing device is set, the deashing device can will adsorb on metallic conductor Dust and ammonium salt shake off in the ash bucket.
Advantageous effects of the invention:
In the anti-poisoning catalytic reaction system of low-temperature denitration of flue gas of the present invention, flue gas is entered by lower mouth, adsorbs big portion The plate-shape metal conductor of point dust is located at catalyst layer lower section, and when deashing will not fall again on a catalyst；Utilize electrostatic physics Strong adsorption force is adsorbed, adsorption efficiency is high, and adsorption capacity is big, without frequently replacement, can effectively solve what low temperature catalyst was easily poisoned Problem.
Detailed description of the invention
Fig. 1 is the anti-poisoning catalytic reaction system stereoscopic schematic diagram of low-temperature denitration of flue gas.
Fig. 2 is the anti-poisoning catalytic reaction system main view of low-temperature denitration of flue gas.
Fig. 3 is the anti-poisoning catalytic reaction system side view of low-temperature denitration of flue gas.
In figure, 1- shell；2- catalyst；3- metallic conductor；4- high-voltage DC power supply；5- ash bucket；6- insulation fixed frame；7- Vibrate support frame.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, right The present invention is explained in further detail.It should be appreciated that specific embodiment described herein is used only for explaining the present invention, and It is not used in the restriction present invention.
On the contrary, the present invention covers any substitution done on the essence and scope of the present invention being defined by the claims, repairs Change, equivalent method and scheme.Further, in order to make the public have a better understanding the present invention, below to of the invention thin It is detailed to describe some specific detail sections in section description.Part without these details for a person skilled in the art The present invention can also be understood completely in description.
The principle of the anti-poisoning catalytic reaction system of low-temperature denitration of flue gas of the present invention are as follows: during the low-temperature denitration of flue gas is anti- Metallic conductor in malicious catalytic reaction system is fixed on top insulation fixed frame, and connection high-voltage DC power supply mould group the two poles of the earth form electricity , and the bar shaped end of metallic conductor is inserted in catalyst gap；It is plate shape below metallic conductor, adsorption area is larger, main to use Adsorb fine dust, top is bar shaped, the ammonium salt generated in primary attachment catalyst duct.Multilayer is placed in system removes nitrogen The catalyst of oxide；The impurity adsorbed on metallic conductor is periodically removed using vibration device, so that it is fallen into lower section ash bucket, is improved Adsorption efficiency.The present invention is reduced impurity (ammonium sulfate, ammonium hydrogen sulfate, ammonium nitrate, dust) and is being catalyzed by Electrostatic Absorption impurity The covering on agent surface solves the problems, such as that low temperature catalyst is poisoned because of ammonium salt covering or catalyst sulfuric acid, can high degree Improve reactivity and the service life of low-temperature denitration of flue gas catalyst.
Embodiment 1
A kind of anti-poisoning catalytic reaction system of low-temperature denitration of flue gas, as shown in Figure 1-3, the low-temperature denitration of flue gas is anti-poisoning 2 layers of honeycombed catalyst 2 are installed, the plate shape end and lower section of metallic conductor 3 vibrate support frame 7 in the shell 1 of catalytic reaction system Connection, the bar shaped end of metallic conductor 3 are prickle wire, and bar shaped end passes through 2 duct of catalyst, bar shaped end top and insulation fixed frame 6 It is connected and fixed；The conductor spacing of adjacent metal conductor 3 is 10mm.1 external high pressure DC power supply of shell, 4 voltage is 30kV, lower part To collect grey ash bucket 5.Ash removal equipment for flapping is installed on vibration support frame 7.
Flue gas containing nitrogen oxides and ammonia is entered by the lower mouth of shell 1, flows through the plate end of metallic conductor 3, metal is led High pressure makes air ionization between body, and then makes the charged plate shape end for being adsorbed on metallic conductor 3 of dust.More clean flue gas continues Catalyst 2 is flowed to, nitrogen oxides therein is reduced to nitrogen by ammonia under the effect of catalyst 2, while having side reaction Generate ammonium salt.Ammonium salt after generation is adsorbed by the electrification prickle wire of metallic conductor 3 in 2 duct of catalyst, to avoid being covered on 2 surface of catalyst.Periodically starting vibrating bottom support frame 7 on ash removal equipment for flapping, by the dust of absorption and ammonium salt shake off into Bottom ash bucket 5 improves adsorption efficiency.Flue gas up to standard is by the discharge suitable for reading of shell 1.
Embodiment 2
3 layers of corrugated catalyst agent 2, metallic conductor 3 are installed in the shell 1 of the anti-poisoning catalytic reaction system of low-temperature denitration of flue gas Plate shape end is connect with lower section vibration support frame 7, and 3 bar shaped end of metallic conductor is jaggies, passes through 2 duct of catalyst, bar shaped end Top is connected and fixed with insulation fixed frame 6, and the spacing of adjacent metal conductor 3 is 100mm.1 external high pressure DC power supply of shell, 4 electricity Pressure is 100kV, and lower part is to collect grey ash bucket 5.Ash removal equipment for flapping is installed on vibration support frame 7.
Flue gas containing nitrogen oxides and ammonia is entered by the lower mouth of shell 1, flows through the plate end of metallic conductor 3, metal is led High pressure makes air ionization between body, and then makes dust is charged to be adsorbed on 3 plate shape end of metallic conductor.More clean flue gas is after afterflow It moves to catalyst 2, nitrogen oxides therein is reduced to nitrogen by ammonia under the effect of catalyst 2, while having side reaction to produce Raw ammonium salt.Ammonium salt after generation is adsorbed by the electrification jaggies of metallic conductor 3 in 2 duct of catalyst, is urged to avoid being covered on 2 surface of agent.The periodically sound wave ash cleaner on starting vibrating bottom support frame 7, the dust of absorption and ammonium salt are shaken off the bottom of into Portion's ash bucket 5 improves adsorption efficiency.Flue gas up to standard is by the discharge suitable for reading of shell 1.
Embodiment 3
4 laminate shape catalyst 2,3 plate of metallic conductor are installed in the shell 1 of the anti-poisoning catalytic reaction system of low-temperature denitration of flue gas Shape end is connect with lower section vibration support frame 7, and 3 bar shaped end of metallic conductor is astroid, and bar shaped end passes through 2 duct of catalyst, bar shaped End top is connected and fixed with insulation fixed frame 6, and the spacing of adjacent metal conductor 3 is 30mm.1 external high pressure DC power supply 4 of shell Voltage is 60kV, and lower part is to collect grey ash bucket 5.Ash removal equipment for flapping is installed on vibration support frame 7.
Flue gas containing nitrogen oxides and ammonia is entered by the lower mouth of shell 1, flows through the plate end of metallic conductor 3, metal is led High pressure makes air ionization between body, and then makes dust is charged to be adsorbed on 3 plate shape end of metallic conductor.More clean flue gas is after afterflow It moves to catalyst 2, nitrogen oxides therein is reduced to nitrogen by ammonia under the effect of catalyst 2, while having side reaction to produce Raw ammonium salt.Ammonium salt after generation is adsorbed by the electrification astroid of metallic conductor 3 in 2 duct of catalyst, is urged to avoid being covered on 2 surface of agent.The periodically ash removal equipment for flapping on starting vibrating bottom support frame 7, the dust of absorption and ammonium salt are shaken off the bottom of into Portion's ash bucket 5 improves adsorption efficiency.Flue gas up to standard is by the discharge suitable for reading of shell 1.
Embodiment 4
2 layers of annular catalyst 2,3 plate of metallic conductor are installed in the shell 1 of the anti-poisoning catalytic reaction system of low-temperature denitration of flue gas Shape end is connect with lower section vibration support frame 7, and bar shaped end is wire, and bar shaped end is above 2 duct of catalyst, bar shaped end and absolutely Edge fixed frame 6 is connected and fixed, and the spacing of adjacent metal conductor 3 is 40mm.1 external high pressure DC power supply of shell, 4 voltage is 80kV, Lower part is to collect grey ash bucket 5.Sound wave ash cleaner is installed on vibration support frame 7.
Flue gas containing nitrogen oxides and ammonia is entered by the lower mouth of shell 1, flows through the plate end of metallic conductor 3, metal is led High pressure makes air ionization between body, and then makes dust is charged to be adsorbed on 3 plate shape end of metallic conductor.More clean flue gas is after afterflow It moves to catalyst 2, nitrogen oxides therein is reduced to nitrogen by ammonia under the effect of catalyst 2, while having side reaction to produce Raw ammonium salt.Ammonium salt after generation is adsorbed by the charged wire of metallic conductor 3 in 2 duct of catalyst, is urged to avoid being covered on 2 surface of agent.The periodically sound wave ash cleaner on starting vibrating bottom support frame 7, the dust of absorption and ammonium salt are shaken off the bottom of into Portion's ash bucket 5 improves adsorption efficiency.Flue gas up to standard is by the discharge suitable for reading of shell 1.
Embodiment 5
3 layers of honeycombed catalyst 2, metallic conductor 3 are installed in the shell 1 of the anti-poisoning catalytic reaction system of low-temperature denitration of flue gas Plate shape end and lower section vibration support frame 7 connects, and bar shaped end is metal bar, and bar shaped end passes through 2 duct of catalyst, above bar shaped end and Insulation fixed frame 6 is connected and fixed；The spacing of adjacent metal conductor 3 is 80mm.1 external high pressure DC power supply of shell, 4 voltage is 80kV, lower part are to collect grey ash bucket 5.Ash removal equipment for flapping is installed on vibration support frame 7.
Flue gas containing nitrogen oxides and ammonia is entered by the lower mouth of shell 1, flows through the plate end of metallic conductor 3, metal is led High pressure makes air ionization between body, and then makes dust is charged to be adsorbed on 3 plate shape end of metallic conductor.More clean flue gas is after afterflow It moves to catalyst 2, nitrogen oxides therein is reduced to nitrogen by ammonia under the effect of catalyst 2, while having side reaction to produce Raw ammonium salt.Ammonium salt after generation is adsorbed by the charged metal stick of metallic conductor 3 in 2 duct of catalyst, is urged to avoid being covered on 2 surface of agent.The periodically ash removal equipment for flapping on starting vibrating bottom support frame 7, the dust of absorption and ammonium salt are shaken off the bottom of into Portion's ash bucket 5 improves adsorption efficiency.Flue gas up to standard is by the discharge suitable for reading of shell 1.
Embodiment 6
2 layers of annular catalyst 2,3 plate of metallic conductor are installed in the shell 1 of the anti-poisoning catalytic reaction system of low-temperature denitration of flue gas Shape end is connect with lower section vibration support frame 7, and bar shaped end is sheet metal, and bar shaped end is above 2 duct of catalyst, bar shaped end and absolutely Edge fixed frame 6 is connected and fixed；The spacing of adjacent metal conductor 3 is 5mm.1 external high pressure DC power supply of shell, 4 voltage is 1kV, under Portion is to collect grey ash bucket 5.Sound wave ash cleaner is installed on vibration support frame 7.
Flue gas containing nitrogen oxides and ammonia is entered by the lower mouth of shell 1, flows through the plate end of metallic conductor 3, metal is led High pressure makes air ionization between body, and then makes dust is charged to be adsorbed on 3 plate shape end of metallic conductor.More clean flue gas is after afterflow It moves to catalyst 2, nitrogen oxides therein is reduced to nitrogen by ammonia under the effect of catalyst 2, while having side reaction to produce Raw ammonium salt.Ammonium salt after generation is adsorbed by the charged metal piece of metallic conductor 3 in 2 duct of catalyst, is urged to avoid being covered on 2 surface of agent.The periodically sound wave ash cleaner on starting vibrating bottom support frame 7, the dust of absorption and ammonium salt are shaken off the bottom of into Portion's ash bucket 5 improves adsorption efficiency.Flue gas up to standard is by the discharge suitable for reading of shell 1.
Embodiment 7
2 layers of annular catalyst 2,3 plate of metallic conductor are installed in the shell 1 of the anti-poisoning catalytic reaction system of low-temperature denitration of flue gas Shape end is connect with lower section vibration support frame 7, and bar shaped end is metal bar, and bar shaped end is above 2 duct of catalyst, bar shaped end and absolutely Edge fixed frame 6 is connected and fixed, and the spacing of adjacent metal conductor 3 is 20mm.1 external high pressure DC power supply of shell, 4 voltage is 50kV, Lower part is to collect grey ash bucket 5.Ash removal equipment for flapping is installed on vibration support frame 7.
Flue gas containing nitrogen oxides and ammonia is entered by the lower mouth of shell 1, flows through the plate end of metallic conductor 3, metal is led High pressure makes air ionization between body, and then makes dust is charged to be adsorbed on 3 plate shape end of metallic conductor.More clean flue gas is after afterflow It moves to catalyst 2, nitrogen oxides therein is reduced to nitrogen by ammonia under the effect of catalyst 2, while having side reaction to produce Raw ammonium salt.Ammonium salt after generation is adsorbed by the charged metal stick of metallic conductor 3 in 2 duct of catalyst, is urged to avoid being covered on 2 surface of agent.The periodically ash removal equipment for flapping on starting vibrating bottom support frame 7, the dust of absorption and ammonium salt are shaken off the bottom of into Portion's ash bucket 5 improves adsorption efficiency.Flue gas up to standard is by the discharge suitable for reading of shell 1.
Embodiment 8
2 layers of annular catalyst 2,3 plate of metallic conductor are installed in the shell 1 of the anti-poisoning catalytic reaction system of low-temperature denitration of flue gas Shape end is connect with lower section vibration support frame 7, and bar shaped end is sheet metal, and bar shaped end is above 2 duct of catalyst, bar shaped end and absolutely Edge fixed frame 6 is connected and fixed, and the spacing of adjacent metal conductor 3 is 25mm.1 external high pressure DC power supply of shell, 4 voltage is 50kV, Lower part is to collect grey ash bucket 5.Sound wave ash cleaner is installed on vibration support frame 7.
Flue gas containing nitrogen oxides and ammonia is entered by the lower mouth of shell 1, flows through the plate end of metallic conductor 3, metal is led High pressure makes air ionization between body, and then makes dust is charged to be adsorbed on 3 plate shape end of metallic conductor.More clean flue gas is after afterflow It moves to catalyst 2, nitrogen oxides therein is reduced to nitrogen by ammonia under the effect of catalyst 2, while having side reaction to produce Raw ammonium salt.Ammonium salt after generation is adsorbed by the charged metal piece of metallic conductor 3 in 2 duct of catalyst, is urged to avoid being covered on 2 surface of agent.The periodically sound wave ash cleaner on starting vibrating bottom support frame 7, the dust of absorption and ammonium salt are shaken off the bottom of into Portion's ash bucket 5 improves adsorption efficiency.Flue gas up to standard is by the discharge suitable for reading of shell 1.
Embodiment 9
4 layers of honeycombed catalyst 2, metallic conductor 3 are installed in the shell 1 of the anti-poisoning catalytic reaction system of low-temperature denitration of flue gas Plate shape end and lower section vibration support frame 7 connects, and bar shaped end is sheet metal, and bar shaped end passes through 2 duct of catalyst, above bar shaped end and Insulation fixed frame 6 is connected and fixed；The spacing of adjacent metal conductor 3 is 10mm.1 external high pressure DC power supply of shell, 4 voltage is 40kV, lower part are to collect grey ash bucket 5.Ash removal equipment for flapping is installed on vibration support frame 7.
Flue gas containing nitrogen oxides and ammonia is entered by the lower mouth of shell 1, flows through the plate end of metallic conductor 3, metal is led High pressure makes air ionization between body, and then makes dust is charged to be adsorbed on 3 plate shape end of metallic conductor.More clean flue gas is after afterflow It moves to catalyst 2, nitrogen oxides therein is reduced to nitrogen by ammonia under the effect of catalyst 2, while having side reaction to produce Raw ammonium salt.Ammonium salt after generation is adsorbed by the charged metal piece of metallic conductor 3 in 2 duct of catalyst, is urged to avoid being covered on 2 surface of agent.The periodically ash removal equipment for flapping on starting vibrating bottom support frame 7, the dust of absorption and ammonium salt are shaken off the bottom of into Portion's ash bucket 5 improves adsorption efficiency.Flue gas up to standard is by the discharge suitable for reading of shell 1.
Embodiment 10
2 layers of annular catalyst 2,3 plate of metallic conductor are installed in the shell 1 of the anti-poisoning catalytic reaction system of low-temperature denitration of flue gas Shape end is connect with lower section vibration support frame 7, and bar shaped end is sheet metal, and bar shaped end is above 2 duct of catalyst, bar shaped end and absolutely Edge fixed frame 6 is connected and fixed, and the spacing of adjacent metal conductor 3 is 90mm.1 external high pressure DC power supply of shell, 4 voltage is 90kV, Lower part is to collect grey ash bucket 5.Sound wave ash cleaner is installed on vibration support frame 7.
Flue gas containing nitrogen oxides and ammonia is entered by the lower mouth of shell 1, flows through the plate end of metallic conductor 3, metal is led High pressure makes air ionization between body, and then makes dust is charged to be adsorbed on 3 plate shape end of metallic conductor.More clean flue gas is after afterflow It moves to catalyst 2, nitrogen oxides therein is reduced to nitrogen by ammonia under the effect of catalyst 2, while having side reaction to produce Raw ammonium salt.Ammonium salt after generation is adsorbed by the charged metal piece of metallic conductor 3 in 2 duct of catalyst, is urged to avoid being covered on 2 surface of agent.The periodically sound wave ash cleaner on starting vibrating bottom support frame 7, the dust of absorption and ammonium salt are shaken off the bottom of into Portion's ash bucket 5 improves adsorption efficiency.Flue gas up to standard is by the discharge suitable for reading of shell 1.
The above description is only a preferred embodiment of the present invention, is not intended to restrict the invention, it is clear that those skilled in the art Various changes and modifications can be made to the invention by member without departing from the spirit and scope of the present invention.If in this way, of the invention Within the scope of the claims of the present invention and its equivalent technology, then the present invention is also intended to encompass these to these modifications and variations Including modification and variation.

Claims (7)

1. a kind of anti-poisoning catalytic reaction system of low-temperature denitration of flue gas, which is characterized in that the catalytic reaction system includes shell (1), it is fixed on the catalyst (2), metallic conductor (3), high-voltage DC power supply (4), the insulation positioned at case top of enclosure interior Fixed frame (6) and the vibration support frame (7) for being located at shell (1) bottom；The metallic conductor (3) includes plate shape end and bar shaped end, The metallic conductor (3) is connect by plate shape end with the high-voltage DC power supply (4) and the vibration support frame (7), The bar shaped end of the metallic conductor (3) passes through the duct on the catalyst (2) and connect with the insulation fixed frame (6)；
The quantity of the metallic conductor is at least 2, and the plate shape end of the metallic conductor (3) is alternately sequentially connected with high voltage direct current The anode and cathode in source (4)；The bar shaped end of the metallic conductor (3) is wire, metal bar, sheet metal, prickle wire, astroid With any one in jaggies, the electrode spacing between two adjacent metallic conductors (3) is 5-100mm；The metal is led The plate shape end of body (3) is used to adsorb fine dust, and the plate shape end bar shaped end of the metallic conductor (3) is inserted in the gap of catalyst Interior, for being generated in adsorption catalyst duct ammonium salt；
Catalyst can be reduced by sulfur dioxide sulphation with sulfur dioxide generation sulphur ammonium salt by increasing the intake of ammonia And cause irreversible poisoning.
2. the anti-poisoning catalytic reaction system of a kind of low-temperature denitration of flue gas according to claim 1, which is characterized in that the shell (1) to be vertical Z-shaped, the lower mouth that enters for flue gas including being located at housing bottom side and it is located at case top side and is used for flue gas It is derived suitable for reading, the lower mouth and the two sides opposite positioned at shell suitable for reading.
3. the anti-poisoning catalytic reaction system of a kind of low-temperature denitration of flue gas according to claim 1, which is characterized in that the high pressure DC power supply (4) voltage range is 1-100kV.
4. the anti-poisoning catalytic reaction system of a kind of low-temperature denitration of flue gas according to claim 3, which is characterized in that the high pressure DC power supply (4) is set to the outside of the shell (1).
5. the anti-poisoning catalytic reaction system of a kind of low-temperature denitration of flue gas according to claim 1, which is characterized in that the catalysis The shape of agent (2) is any one in honeycomb, corrugated, plate and tubular, and the number of plies of the catalyst (2) is layer 2-4.
6. the anti-poisoning catalytic reaction system of a kind of low-temperature denitration of flue gas according to claim 1, which is characterized in that the catalysis Reaction system further includes for collecting the ash bucket of impurity (5), and the ash bucket (5) is set to the lower part of vibration support frame (7).
7. the anti-poisoning catalytic reaction system of a kind of low-temperature denitration of flue gas according to claim 6, which is characterized in that vibration support Deashing device is set on frame (7), and the deashing device can shake off the dust and ammonium salt adsorbed on metallic conductor (3) into described In ash bucket (5).
CN201710017412.XA 2017-01-10 2017-01-10 A kind of anti-poisoning catalytic reaction system of low-temperature denitration of flue gas Active CN106823782B (en)

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