CN107715630B - Flue gas purifying device - Google Patents
Flue gas purifying device Download PDFInfo
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- CN107715630B CN107715630B CN201711105288.9A CN201711105288A CN107715630B CN 107715630 B CN107715630 B CN 107715630B CN 201711105288 A CN201711105288 A CN 201711105288A CN 107715630 B CN107715630 B CN 107715630B
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- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 48
- 239000003546 flue gas Substances 0.000 title claims abstract description 48
- 238000001914 filtration Methods 0.000 claims abstract description 79
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 claims abstract description 23
- 238000000746 purification Methods 0.000 claims abstract description 21
- 241000894006 Bacteria Species 0.000 claims abstract description 15
- 239000000428 dust Substances 0.000 claims abstract description 15
- 239000002245 particle Substances 0.000 claims abstract description 14
- 230000003197 catalytic effect Effects 0.000 claims abstract description 7
- 239000012535 impurity Substances 0.000 claims abstract description 6
- 238000007254 oxidation reaction Methods 0.000 claims abstract description 5
- 239000012528 membrane Substances 0.000 claims abstract description 4
- 150000002500 ions Chemical class 0.000 claims description 26
- 230000001502 supplementing effect Effects 0.000 claims description 26
- 239000003054 catalyst Substances 0.000 claims description 18
- 239000006260 foam Substances 0.000 claims description 17
- 229910052751 metal Inorganic materials 0.000 claims description 17
- 239000002184 metal Substances 0.000 claims description 17
- 229910052878 cordierite Inorganic materials 0.000 claims description 16
- JSKIRARMQDRGJZ-UHFFFAOYSA-N dimagnesium dioxido-bis[(1-oxido-3-oxo-2,4,6,8,9-pentaoxa-1,3-disila-5,7-dialuminabicyclo[3.3.1]nonan-7-yl)oxy]silane Chemical compound [Mg++].[Mg++].[O-][Si]([O-])(O[Al]1O[Al]2O[Si](=O)O[Si]([O-])(O1)O2)O[Al]1O[Al]2O[Si](=O)O[Si]([O-])(O1)O2 JSKIRARMQDRGJZ-UHFFFAOYSA-N 0.000 claims description 16
- 239000004744 fabric Substances 0.000 claims description 15
- 238000004140 cleaning Methods 0.000 claims description 13
- 238000010438 heat treatment Methods 0.000 claims description 12
- 229910018487 Ni—Cr Inorganic materials 0.000 claims description 9
- VNNRSPGTAMTISX-UHFFFAOYSA-N chromium nickel Chemical compound [Cr].[Ni] VNNRSPGTAMTISX-UHFFFAOYSA-N 0.000 claims description 9
- 229920000049 Carbon (fiber) Polymers 0.000 claims description 8
- 239000004917 carbon fiber Substances 0.000 claims description 8
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 8
- 239000000523 sample Substances 0.000 claims description 8
- 239000000835 fiber Substances 0.000 claims description 7
- 239000007789 gas Substances 0.000 claims description 7
- 150000001450 anions Chemical class 0.000 claims description 6
- 239000003365 glass fiber Substances 0.000 claims description 5
- 239000000463 material Substances 0.000 claims description 4
- 239000004743 Polypropylene Substances 0.000 claims description 3
- -1 polypropylene Polymers 0.000 claims description 3
- 229920001155 polypropylene Polymers 0.000 claims description 3
- 239000011148 porous material Substances 0.000 claims description 3
- 239000013618 particulate matter Substances 0.000 claims description 2
- 239000003039 volatile agent Substances 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 6
- 239000011882 ultra-fine particle Substances 0.000 abstract description 5
- 238000004887 air purification Methods 0.000 abstract 1
- 239000000779 smoke Substances 0.000 description 6
- 238000010992 reflux Methods 0.000 description 5
- 238000000034 method Methods 0.000 description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 3
- 230000005684 electric field Effects 0.000 description 3
- 238000005265 energy consumption Methods 0.000 description 3
- 230000001954 sterilising effect Effects 0.000 description 3
- 238000011144 upstream manufacturing Methods 0.000 description 3
- 239000006227 byproduct Substances 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000005485 electric heating Methods 0.000 description 2
- 239000010419 fine particle Substances 0.000 description 2
- 125000002485 formyl group Chemical class [H]C(*)=O 0.000 description 2
- 239000006262 metallic foam Substances 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N Phenol Chemical compound OC1=CC=CC=C1 ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006555 catalytic reaction Methods 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 230000000593 degrading effect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007865 diluting Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000010891 electric arc Methods 0.000 description 1
- 230000005672 electromagnetic field Effects 0.000 description 1
- 238000001962 electrophoresis Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- WSFSSNUMVMOOMR-NJFSPNSNSA-N methanone Chemical compound O=[14CH2] WSFSSNUMVMOOMR-NJFSPNSNSA-N 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 239000005416 organic matter Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 230000003071 parasitic effect Effects 0.000 description 1
- 150000002989 phenols Chemical class 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000006479 redox reaction Methods 0.000 description 1
- 238000006722 reduction reaction Methods 0.000 description 1
- 208000023504 respiratory system disease Diseases 0.000 description 1
- 238000004659 sterilization and disinfection Methods 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D50/00—Combinations of methods or devices for separating particles from gases or vapours
-
- 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
- B01D53/76—Gas phase processes, e.g. by using aerosols
-
- 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
- B01D53/8678—Removing components of undefined structure
- B01D53/8687—Organic components
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/10—Oxidants
- B01D2251/104—Ozone
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biomedical Technology (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Health & Medical Sciences (AREA)
- Dispersion Chemistry (AREA)
- Filtering Of Dispersed Particles In Gases (AREA)
- Electrostatic Separation (AREA)
- Exhaust Gas Treatment By Means Of Catalyst (AREA)
Abstract
A novel flue gas purification device belongs to the technical field of air purification and aims to solve the problem of poor dedusting and degerming effects in the prior art. The invention comprises a shell, wherein one end of the shell is used as an air inlet, the other end of the shell is used as an air outlet, and a primary filtering section, a secondary filtering section and a tertiary filtering section are sequentially arranged from the air inlet to the air outlet in the shell; the first-stage filtering section is a physical filter membrane filtering section for removing visible dust, bacteria and impurities more than pm2.5 in the flue gas; the secondary filtering section is an electrostatic particle generation section and is used for removing residual particles, ultrafine particles below pm2.5, bacteria and organic volatile matters in the flue gas and generating ozone; the three-stage filtering section is a temperature control catalytic section, and residual organic volatile matters are degraded through oxidization and are subjected to clean filtration. The invention adopts a three-stage filtering structure to filter out dust and impurities in the air, adopts three-stage different forms of layered filtering and purifying, and has remarkable purifying effect.
Description
Technical Field
The invention belongs to the technical field of flue gas purification, and particularly relates to a novel flue gas purification device.
Background
At present, domestic air conditioners all utilize a filter plate to pressurize in an air pipe through a fan, so that dust-containing air passes through the filter plate to achieve the purposes of cleaning, dedusting and sterilizing. The dust removal and sterilization method is not clean in the long-term, is easy to cause the blockage of the filter plate and parasitic to a large amount of bacteria, and causes respiratory diseases of personnel. The fan is too heavy in burden, seriously consumes machinery, and shortens the service life of the air conditioner.
Chinese patent publication No. CN107051725a discloses a device named as device for removing ultrafine particles in air based on concentration of micro electric field, which is characterized in that fresh air is sucked into an air inlet, a negative ion generator is connected with a carbon brush, and electronic electrophoresis release is performed by taking the carbon brush as the center, and charged particles adsorb fine particles in the air without bacteria surface, so that the polarity of fine particles and bacteria is Cheng Yinji. The carbon brush contacts with the aluminum foil layer on the inner wall of the pipeline to make the pipe wall negatively charged to form a negatively charged hollow pipe. The charged particles form vortex with water on the same side as the 90-degree corner at the corner along with air passing through the negative charge hollow tube, and enter the dust storage box along with the concave backflow angle. Ultrafine particles in the air with the cathode electric field can move to the anode electric field side along with the orientation of the magnetic induction line in the artificial anode electromagnetic field. Negative charges are removed, so that neutral ultrafine particles stay in the dust storage box to achieve the effect of concentrated dust removal. The device can remove dust and bacteria from air through the action of charged charges, but the removal effect is incomplete, and partial organic matters and particulate matters can not be removed cleanly.
Disclosure of Invention
The invention aims to provide a novel flue gas purifying device which solves the problem of poor dedusting and sterilizing effects in the prior art.
In order to achieve the above purpose, the novel flue gas purifying device of the invention comprises a shell, wherein one end of the shell is used as an air inlet, the other end of the shell is used as an air outlet, and a first-stage filtering section, a second-stage filtering section and a third-stage filtering section are sequentially arranged from the air inlet to the air outlet in the shell;
the first-stage filtering section is a physical filter membrane filtering section for removing visible dust, bacteria and impurities more than pm2.5 in the flue gas;
the secondary filtering section is an electrostatic particle generation section and is used for removing residual particulate matters, particulate matters below pm2.5, bacteria and organic volatile matters in the flue gas and generating ozone;
the three-stage filtering section is a temperature control catalytic section, and residual organic volatile matters are degraded through oxidization and are subjected to clean filtration.
The flue gas purification device further comprises a secondary air supplementing structure arranged between the tail end of the three-stage filtering section and the air outlet, the secondary air supplementing structure is an air supplementing channel connected to the side wall of the shell, an air supplementing machine is arranged in the air supplementing channel, and the air supplementing machine is an induced draft fan with adjustable air speed.
The flue gas purification device also comprises an air backflow branch which is connected with the front end and the rear end of the three-stage filtering section; the air backflow branch comprises a backflow channel, a backflow fan is arranged in the backflow channel and a channel at the downstream connecting end of the air outlet of the three-stage filtering section, and the backflow fan is an induced draft fan with adjustable wind speed.
The flue gas purification device further comprises an ozone detector arranged at the air outlet and a temperature and air pressure probe arranged at the front end of the three-stage filtering section.
The flue gas purification device further comprises a controller and a PLC control screen arranged outside the shell and connected with the controller, and the controller is connected with the ozone detector and the temperature and wind pressure probe.
And a filter material cloth and an induced draft fan are sequentially arranged in the first-stage filtering section from the air inlet to the inside.
The filter material cloth comprises three layers from outside to inside; the layer close to the air inlet is an outer layer and is composed of fiber cloth with a 500-mesh diameter of 30 nanometers; the middle layer is a structural layer and is woven by fiber bundles with the diameter of 1 micrometer; one layer far away from the air inlet is an inner layer, is polypropylene melt-blown cloth and has pores of 1.5 micrometers; the induced draft fan is an adjustable wind speed induced draft fan.
Negative ion generating net, glass fiber net and foam metal filter are set in the second grade filter section from air inlet to air outlet in proper order, and the shell is equipped with the negative ion generator who is connected with the power outward, negative ion generator negative pole end with the negative ion generating net is connected, and the positive pole end with foam metal filter connects, foam metal filter ground protection.
The negative ion generating net is a carbon fiber net sheet, and carbon fiber fluff with the height of 3mm is distributed on the back air side.
A nickel-chromium heating net and a cordierite flow-avoiding layer are sequentially arranged in the three-stage filtering section from the air inlet to the air outlet; the cordierite windward surface is coated with a catalyst with Pt/Pd of 4:1.
The beneficial effects of the invention are as follows: the novel smoke purifying device adopts a three-stage filtering structure to filter out and degrade dust, bacteria, impurities, organic matters and the like in smoke. Firstly, large particles and partial bacteria and smoke dust in the smoke are removed through filter material cloth in a first-stage filtering section, the wind speed of a draught fan in the first-stage filtering section is adjustable, and the requirements of people on sleeping, normal living, room cleaning, toilet and kitchen emergency, smoke dust environment in factories and wind quantity during vehicle tail gas filtering and discharging can be met; secondly, condensing residual particles and partial organic volatile matters in a secondary filtering section by utilizing anions, and generating ozone; finally, the byproduct ozone of the first-stage filtration is oxidized by a catalyst in a certain wind speed environment and a temperature environment through physical and chemical actions in a third-stage filtration section, so that the aim of self-cleaning is fulfilled; the three-level different forms of layered filtration purification are adopted, the purification effect is obvious, and the method can be applied to families, life, traffic, factories, industrial operation areas and the like.
Drawings
FIG. 1 is a front view of the external structure of a novel flue gas cleaning device of the present invention;
FIG. 2 is a left side view showing the external structure of the novel flue gas purifying device of the present invention;
FIG. 3 is a schematic diagram of the internal structure of a novel flue gas cleaning device according to the present invention;
wherein: 1. the filter comprises a shell, 2, an air inlet, 3, an air outlet, 4, a primary filtering section, 401, filter cloth, 402, an induced draft fan, 5, a secondary filtering section, 501, a negative ion generating net, 502, a foam metal filter, 503, a negative ion generator, 504, a glass fiber net, 6, a tertiary filtering section, 601, a nickel-chromium heating net, 602, a cordierite flow-avoiding layer, 7, a secondary air supplementing structure, 701, an air supplementing channel, 702, an air supplementing fan, 8, an air backflow branch, 801, a backflow channel, 802 and a backflow fan.
Detailed Description
Embodiments of the present invention will be further described with reference to the accompanying drawings.
Referring to fig. 1-3, the novel flue gas purifying device comprises a shell 1, wherein one end of the shell 1 is used as an air inlet 2, the other end of the shell is used as an air outlet 3, and a primary filtering section 4, a secondary filtering section 5 and a tertiary filtering section 6 are sequentially arranged from the air inlet 2 to the air outlet 3 in the shell 1;
the first-stage filtering section 4 is a physical filter membrane filtering section for removing visible dust, bacteria and more than pm2.5 organic volatile matters and other smoke dust in the air; a filter cloth 401 and an induced draft fan are sequentially arranged in the first-stage filtering section from the air inlet to the inside, and the filter cloth 401 comprises three layers from the outside to the inside; one layer close to the air inlet 2 is an outer layer and is composed of fiber cloth with a 500-mesh diameter of 30 nanometers; the middle layer is a structural layer and is made of fiber cloth which is woven by fiber bundles with the diameter of 1 micrometer and has ductility and difficult deformation; the layer far away from the air inlet 2 is an inner layer, is polypropylene melt-blown cloth and has pores of 1.5 micrometers; the induced draft fan 402 is an adjustable wind speed induced draft fan.
A negative ion generating net 501, a glass fiber net 504 and a foam metal filter 502 are sequentially arranged in the secondary filtering section 5 from the air inlet 2 to the air outlet 3; the negative ion generator 503 connected with the power supply is arranged outside the shell 1, the negative end of the negative ion generator 503 is connected with the negative ion generating net 501, the positive end is connected with the foam metal filter 502, and the foam metal filter 502 is grounded and protected. The glass fiber net 504 prevents the negative ion generating net 501 from generating electric arc too close to the foam metal filter 502, and is provided with a ventilation barrier.
The anion generating net 501 is a carbon fiber net sheet, and carbon fiber fluff with the height of 3mm is distributed on the back air side, so that generated anions can be fully mixed with air flow.
A nickel-chromium heating net 601 and a cordierite flow-avoiding layer 602 are sequentially arranged in the three-stage filtering section 6 from the air inlet 2 to the air outlet 3; the cordierite windward surface is coated with a catalyst with Pt/Pd of 4:1.
The induced draft fan 402 is an adjustable wind speed induced draft fan; the air quantity can be adjusted according to the needs of people, and the air quantity can be divided into 5 gears according to the air speed of the induced draft fan 402, namely calm filtration, low-speed filtration, medium-speed filtration, high-speed filtration and ultrahigh-speed filtration. The requirements of people sleeping, normal living, room cleaning, high-wind-speed and high-efficiency filtering air quantity in the emergency of a bathroom and a kitchen are met;
the secondary filtering section 5 is an electrostatic particle generation section and is used for removing residual particles in the air, particles below pm2.5, bacteria and organic volatile matters and generating ozone; the secondary filter section 5 is internally provided with a negative ion generating net 501 and a foam metal filter 502 in sequence according to the air flow direction, the outside of the shell 1 is provided with a negative ion generator 503 connected with a power supply, the negative end of the negative ion generator 503 is connected with the negative ion generating net 501, the positive end is connected with the foam metal filter 502, and the foam metal filter 502 is grounded and protected; the negative ion generating net 501 is a carbon fiber net sheet, and carbon fiber fluff with the height of 3mm is distributed in back air measurement, so that generated negative ions are fully mixed with air flow;
the three-stage filtering section 6 is a temperature control catalytic section, and oxidation and reduction reactions are carried out on the byproduct ozone of the first-stage filtering section 4 and residual organic volatile matters through oxidation, so that the self-cleaning purposes of removing ozone and degrading volatile matters are achieved; a nickel-chromium heating net 601 and a cordierite flow-avoiding layer 602 are sequentially arranged in the three-stage filtering section 6 from the air inlet 2 to the air outlet 3; the cordierite windward surface is coated with a catalyst with Pt/Pd of 4:1.
The flue gas purification device further comprises a secondary air supplementing structure 7 arranged between the tail end of the three-stage filtering section 6 and the air outlet 3, the secondary air supplementing structure 7 is an air supplementing channel 701 perpendicular to the side wall of the shell 1, an air supplementing fan 702 is arranged in the air supplementing channel 701, the air supplementing amount of the induced draft fan is adjusted by the air supplementing fan 702 according to the air temperature and the ozone content exhausted by the system detection, namely, the rotating speed of the induced draft fan is calculated, and the air speed and the air amount of the induced draft fan are automatically adjusted by the plc central controller, so that the air outlet temperature and relevant gas component indexes reach the national standard.
The flue gas purification device also comprises an air backflow branch 8 connected with the downstream end of the air outlet 3 of the three-stage filtering section 6; the air backflow branch 8 comprises a backflow channel 801, a backflow fan 802 is arranged in a channel at the downstream connecting end of the backflow channel 801 and the air outlet 3 of the three-stage filtering section 6, the backflow fan 802 is an induced draft fan with adjustable air speed, namely the backflow fan, and part of high-temperature hot air discharged after purification through throttling is supplemented to the three-stage filtering section 6, so that the heat of flue gas to be catalyzed is supplemented, the electric heating energy consumption of a heating plate is reduced, and the air speed and the air pressure of the flue gas in the third stage in the interior are regulated. The method comprises the steps of carrying out a first treatment on the surface of the And according to the gas temperature and the flow rate at the front end of the three-stage filtering section 6, calculating according to the reaction efficiency of the catalyst, and controlling the reflux air quantity of the heat recovery section of the reflux section. So that the temperature and the wind pressure of the flue gas reach the high-efficiency area catalyzed by the catalyst at the same time, and the integral purification performance of the machine is improved.
The flue gas purification device also comprises an ozone detector arranged at the air outlet 3 and a temperature and air pressure probe arranged at the front end of the three-stage filtering section 6.
The flue gas purification device further comprises a controller and a PLC control screen which is arranged outside the shell 1 and connected with the controller, the controller is connected with the ozone detector and the temperature and wind pressure probe, and the controller is connected with the induced draft fan 402, the air supplementing fan 702 and the reflux fan 802 to control the rotating speed.
When the ozone content of the purified air is higher than the set concentration value, the ozone detector is arranged, and the air quantity outside the room supplementing machine, namely the rotating speed of the air supplementing machine 702 for supplementing air, is correspondingly adjusted. And (3) diluting and stirring the external air, and releasing the diluted mixed air into a room after reaching the national relevant standard.
The arrangement of the air reflux branch 8 intercepts a part of purified high-temperature clean air, supplements the air to the three-stage purification upstream section, mixes the air with ozone, organic matters and organic volatile matters to be purified in three stages, improves the temperature and the gas flow velocity pressure of the air measured in the three-stage purification upstream section, ensures that the temperature and the wind pressure simultaneously meet the high-efficiency interval of the catalyst, reduces the energy consumption of the nickel-chromium heating net 601 of the three-stage filtering section 6, reduces the power consumption of the machine, and achieves the purposes of purifying and saving energy.
The temperature and wind pressure probes are arranged, the temperature and wind pressure of air at the upstream of the three-stage purification are monitored, when the temperature is lower than the electric heating high-efficiency area of the catalyst, the temperature of the nickel-chromium heating net 601 and the flow of the recycled hot air are regulated at the same time, and the air to be filtered in the three-stage filtering section 6 reaches the high-efficiency area of the catalyst; the purification efficiency is improved, and the energy consumption of the heating plate is reduced; when the wind pressure is not at the catalyst optimum catalytic effect, the wind speed of the return fan 802 in the air return branch 8 is adjusted.
The specific filtering process of the invention is as follows: the primary filtering section 4 filters out large particles, more than pm2.5 impurities, bacteria and particles in the flue gas. After primary filtration, ultrafine particulate matters and organic volatile matters (aldehydes and phenols) with pm less than 2.5 are contained in the flue gas. At this time, the flue gas enters the secondary filter section 5 along with the air flow in the pipeline. Through the anion generating mesh 501, a great amount of anions are carried in the flue gas.
The negative ions are mixed with ultrafine particles, organic matters and volatile matters of the flue gas, and are condensed into relatively large organic matter molecular groups and particulate matter groups. The flue gas of the secondary filter stage 5 contains a certain amount of ozone, since negative ions will convert oxygen into ozone. During the passage of the flue gas from the secondary filter stage 5 through the metal foam filter 502, electrons are dumped by the conductivity of the metal foam filter 502 to the ground line of the power supply. The flue gas losing the negative ions can hang inside the foam metal in the dense channel through the foam metal filter 502, and the flue gas led out through the foam metal filter 502 contains almost no particulate matters. Only a certain amount of ozone, a small amount of organic matters and organic volatile matters (formaldehyde, phenol and the like) are contained. The flue gas containing a certain amount of ozone, organic matters and organic volatile matters firstly passes through a nickel-chromium heating net 601 to heat the flue gas to about 150 ℃, namely, the temperature range of a catalyst high-efficiency area, and then passes through a cordierite flow-avoiding layer 602 coated with a catalyst with the Pt/Pd of 4:1, and almost all flue gas particles and macromolecular organic matters can be removed by the high density of the cordierite flow-avoiding layer 602; the organic matters, aldehyde organic volatile matters are fully reflected by the catalyst and ozone under the action of wind pressure at the temperature, C02 and H2O are generated, and the organic matters are filtered out from the other side of the cordierite flow-avoiding layer 602. The three-stage filtering section 6 is mainly used for catalyzing oxidation-reduction reaction, and the catalyst can be efficiently catalyzed by proper wind pressure and temperature; aiming at the air concentration of the pollutant of 10-55%, the conversion rate of the catalyst reaches 60-90% at the temperature of about 150 ℃. In order to maintain the operation of the high-efficiency area of the catalyst, a temperature and wind pressure probe is arranged at the geometric center position of the middle cross section of the nickel-chromium-saving heating net 601 and the cordierite flow-avoiding layer 602 to be a stable layer of airflow structure, the temperature parameter and the wind pressure parameter of the main flow of the gas are detected, the temperature and the wind pressure parameter are transmitted to a controller, the controller compares the actual temperature and the actual wind pressure according to the temperature and the wind pressure when the catalyst has the best catalytic effect, the operation power of the nickel-chromium heating net 601 and the reflux fan 802 is adjusted in real time, and the actual temperature and the actual wind pressure at the front end of the three-stage filtering section 6 are adjusted; under the condition of meeting the positive working pressure of the catalytic gas, the positive pressure pressed section meeting the best effect of the catalytic reaction is tested according to the relation between the thickness, the area and the wind resistance of the cordierite flow-avoiding layer 602, and the best thickness of the cordierite flow-avoiding layer 602 is found. Here, regarding the requirements of industry, home, and public place for the wind quantity, the thickness of the cordierite flow-avoiding layer 602 of the purifier is determined according to the specific application.
Claims (6)
1. The flue gas purification device is characterized by comprising a shell (1), wherein one end of the shell (1) is used as an air inlet (2), the other end of the shell is used as an air outlet (3), and a primary filtering section (4), a secondary filtering section (5) and a tertiary filtering section (6) are sequentially arranged from the air inlet (2) to the air outlet (3) in the shell (1);
the first-stage filtering section (4) is a physical filter membrane filtering section for removing visible dust, bacteria and PM in the flue gas 2.5 The above impurities; a filter material cloth (401) and a draught fan (402) are sequentially arranged in the first-stage filtering section (4) from the air inlet (2) inwards; the filter cloth (401) comprises three layers from outside to inside; one layer close to the air inlet (2) is an outer layer and is composed of fiber cloth with a 500-mesh diameter of 30 nanometers; the middle layer is a structural layer and is woven by fiber bundles with the diameter of 1 micrometer; the layer far away from the air inlet (2) is an inner layer, is polypropylene melt-blown cloth and has pores of 1.5 micrometers; the induced draft fan (402) is an adjustable wind speed induced draft fan;
the secondary filtering section (5) is an electrostatic particle generation section for removing residual particulate matters and PM in the flue gas 2.5 Particulate matter, bacteria and organic volatiles as follows, and generates ozone; a negative ion generating net (501), a glass fiber net (504) and a foam metal filter (502) are sequentially arranged in the secondary filtering section (5) from the air inlet (2) to the air outlet (3), a negative ion generator (503) connected with a power supply is arranged outside the shell (1), the negative end of the negative ion generator (503) is connected with the negative ion generating net (501), the positive end is connected with the foam metal filter (502), and the foam metal filter (502) is grounded and protected;
the three-stage filtering section (6) is a temperature control catalytic section, and residual organic volatile matters are degraded through oxidization and are subjected to clean filtration; a nickel-chromium heating net (601) and a cordierite flow-avoiding layer (602) are sequentially arranged in the three-stage filtering section (6) from the air inlet (2) to the air outlet (3); the cordierite windward surface is coated with a catalyst with Pt/Pd of 4:1.
2. The flue gas purification device according to claim 1, further comprising a secondary air supplementing structure (7) arranged between the tail end of the tertiary filtering section (6) and the air outlet (3), wherein the secondary air supplementing structure (7) is an air supplementing channel (701) connected to the side wall of the shell (1), an air supplementing fan (702) is arranged in the air supplementing channel (701), and the air supplementing fan (702) is an induced draft fan with adjustable air speed.
3. A flue gas cleaning device according to claim 1, characterized in that the flue gas cleaning device further comprises an air return branch (8) connecting the front end and the rear end of the tertiary filter section (6); the air backflow branch (8) comprises a backflow channel (801), a backflow fan (802) is arranged in a channel at the downstream connecting end of the air outlet of the three-stage filtering section (6), and the backflow fan (802) is an induced draft fan with adjustable wind speed.
4. A flue gas cleaning device according to claim 3, characterized in that the flue gas cleaning device further comprises an ozone detector arranged at the air outlet (3) and a temperature and wind pressure probe arranged at the front end of the three-stage filter stage (6).
5. The flue gas cleaning device according to claim 4, further comprising a controller and a PLC control screen (9) arranged outside the housing (1) and connected to the controller, wherein the controller is connected to the ozone detector and to the temperature and wind pressure probe.
6. A flue gas cleaning device according to claim 1, characterized in that the anion generating mesh (501) is a carbon fiber mesh sheet, and carbon fiber fluff with a height of 3mm is distributed on the back gas side.
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| CN201711105288.9A CN107715630B (en) | 2017-11-10 | 2017-11-10 | Flue gas purifying device |
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| CN201711105288.9A CN107715630B (en) | 2017-11-10 | 2017-11-10 | Flue gas purifying device |
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| CN110116500A (en) * | 2019-05-05 | 2019-08-13 | 陕西理工大学 | A kind of purification reaction room and its air cleaning unit |
| CN110487603A (en) * | 2019-08-15 | 2019-11-22 | 安徽天承科自动化科技有限公司 | A kind of multistage filtering probe and sampling system |
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