CN110976091A - Device for eliminating colored smoke plume by utilizing electrostatic drive of space charge injection - Google Patents
Device for eliminating colored smoke plume by utilizing electrostatic drive of space charge injection Download PDFInfo
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- CN110976091A CN110976091A CN201911343189.3A CN201911343189A CN110976091A CN 110976091 A CN110976091 A CN 110976091A CN 201911343189 A CN201911343189 A CN 201911343189A CN 110976091 A CN110976091 A CN 110976091A
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- 239000000779 smoke Substances 0.000 title claims abstract description 48
- 238000002347 injection Methods 0.000 title claims abstract description 11
- 239000007924 injection Substances 0.000 title claims abstract description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 68
- 239000012080 ambient air Substances 0.000 claims abstract description 24
- 239000003595 mist Substances 0.000 claims abstract description 5
- 238000003379 elimination reaction Methods 0.000 claims description 6
- 238000002156 mixing Methods 0.000 claims description 6
- 230000008030 elimination Effects 0.000 claims description 5
- 230000002708 enhancing effect Effects 0.000 claims description 3
- 239000011248 coating agent Substances 0.000 claims description 2
- 238000000576 coating method Methods 0.000 claims description 2
- 230000002209 hydrophobic effect Effects 0.000 claims description 2
- 230000003068 static effect Effects 0.000 abstract 1
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 29
- 239000003546 flue gas Substances 0.000 description 28
- 150000002500 ions Chemical class 0.000 description 14
- 239000007789 gas Substances 0.000 description 10
- 238000010438 heat treatment Methods 0.000 description 7
- 238000000034 method Methods 0.000 description 6
- 239000003570 air Substances 0.000 description 5
- 238000010586 diagram Methods 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 238000005034 decoration Methods 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 230000005684 electric field Effects 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 229920006395 saturated elastomer Polymers 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 239000010963 304 stainless steel Substances 0.000 description 1
- 229910000589 SAE 304 stainless steel Inorganic materials 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000004939 coking Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 229920002313 fluoropolymer Polymers 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
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Classifications
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- 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
- B03C3/01—Pretreatment of the gases prior to electrostatic precipitation
- B03C3/014—Addition of water; Heat exchange, e.g. by condensation
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
- B01F23/10—Mixing gases with gases
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
-
- 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
- B03C3/02—Plant or installations having external electricity supply
- B03C3/16—Plant or installations having external electricity supply wet type
-
- 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
- B03C3/41—Ionising-electrodes
- B03C3/43—Ionising-electrodes radioactive
-
- 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
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrostatic Separation (AREA)
Abstract
The invention relates to the technical field of environment-friendly devices, in particular to a device for eliminating colored smoke plume by utilizing static drive of space charge injection, which comprises a fog generating chamber, a water drop capturing chamber, a variable frequency fan, a turbulent flow fan, a water drop collecting net, an ion emitter and a water collecting pump, wherein the fog generating chamber is connected with the water drop capturing chamber through the variable frequency fan; the fog generating chamber is communicated with the water drop catching chamber, a smoke inlet and an ambient air inlet are formed in the fog generating chamber, the variable frequency fan is installed in the ambient air inlet, and fan blades of the turbulent fan are located in the fog generating chamber; a plurality of stages of water drop collecting nets and ion emitters are arranged in the water drop catching chamber; the water collecting pump is respectively connected with the bottom of the mist generation chamber and the bottom of the water drop catching chamber through pipelines. The device realizes the treatment of the colored smoke plume under the lower initial investment and operation cost. The system of the invention has no huge heat exchanger or heater, and can greatly reduce the cost.
Description
Technical Field
The invention relates to the technical field of environment-friendly devices, in particular to a device for eliminating colored smoke plume by utilizing electrostatic driving of space charge injection.
Background
At present, most of domestic flue gas in the steel, coking and chemical industries is subjected to spray or wet desulphurization before being discharged, the temperature is reduced to 45-80 ℃, the flue gas is usually saturated wet flue gas at the moment, the flue gas contains a large amount of water vapor, and the water vapor contains more soluble salts, SO3, gel dust, micro dust and the like (which are main components of haze). If the flue gas is directly discharged from the chimney and enters the ambient air with lower temperature, the state point is in the fog region when the flue gas is mixed with the saturated flue gas because the ambient air has lower temperature, and at the moment, water vapor in the flue gas is cooled to form small liquid drops which coexist with the flue gas, namely, wet smoke plume is formed. As mentioned above, the smoke plume contains a lot of harmful substances, and the phenomenon that the haze of China is becoming more serious in recent years is also attributed to colored smoke plume by professional scholars. Therefore, the extraction or collection of the liquid water drops therein is an effective effort to eliminate or treat the colored smoke plume.
In the treatment process of the colored smoke plume, a mode of firstly condensing and then heating is generally adopted, the process flow is that firstly, smoke is cooled to below a saturation temperature through a heat exchanger, water vapor in the smoke is condensed, the condensed smoke is saturated smoke, but the moisture content of the smoke is reduced, then the smoke is heated through a second-stage heat exchanger, the moisture content of the smoke is unchanged, but the relative humidity of the smoke is reduced, the smoke is changed into unsaturated smoke, the unsaturated smoke is discharged into the atmosphere, and after the smoke is contacted with air, the state of a mixing point is present outside a 'fog area/supersaturation area', so that the formation of the colored smoke plume can be effectively avoided or alleviated. The flue gas treatment process can realize water-gas separation, but the energy consumption and initial investment are large, and for example, in the flue gas cooling and heating links, a large amount of high-grade energy is consumed. For example, a heat pump is utilized, and the whole process needs at least two heat exchangers and other auxiliary equipment, and the heat exchangers have strong corrosion resistance and are very high in manufacturing cost. The other treatment mode is to directly heat saturated flue gas to improve the relative humidity of the flue gas, so that the mixing point is outside the fog area/supersaturation area when the flue gas is mixed with the outside air.
As mentioned above, the flue gas temperature participating in colored smoke plume elimination is low, is often below the acid dew point temperature, has strong corrosivity, and puts high requirements on the participating heat exchangers no matter the flue gas is heated or cooled. For the metal heat exchanger, the heat exchange coefficient is higher than that of the fluoroplastic heat exchanger, but the heat exchange coefficient is limited by the low heat conductivity coefficient of the flue gas, and the cost of the heat exchanger is higher. Taking Tianjin City Jinshi group heating plant as an example, the heating plant has 4 gas boilers in total, and when the gas boiler runs at full load, the flue gas flow is 20000m3The temperature is 100 ℃, the heating plant is built in a residential area, and a large amount of colored smoke plume can be formed at the tail end of a flue when the heating season is lost, so that great trouble is brought to surrounding residents. The adopted colored smoke plume elimination process of firstly cooling and then heating has the advantages that the required heat exchange area is 700 square meters by calculation, the material quality is 304 stainless steel, and the cost of the heat exchanger is nearly 30 ten thousand yuan. Therefore, the cost of the existing colored smoke plume elimination equipment also becomes a bottleneck limiting the wide-range popularization of the equipment.
Disclosure of Invention
The present invention is directed to overcome the above-mentioned deficiencies, and to provide a device for eliminating colored smoke plume by electrostatic driving of space charge injection.
In order to achieve the purpose, the invention adopts the following technical scheme: a device for eliminating colored smoke plume by utilizing electrostatic drive of space charge injection is characterized in that: the device comprises a fog generating chamber, a water drop catching chamber, a variable frequency fan, a turbulent flow fan, a water drop collecting net, an ion emitter and a water collecting pump; the fog generating chamber is communicated with the water drop catching chamber, a smoke inlet and an ambient air inlet are formed in the fog generating chamber, the variable frequency fan is installed in the ambient air inlet, fan blades of the turbulent fan are located in the fog generating chamber and used for enhancing mixing of smoke and ambient air, and under the action of the turbulent fan, the smoke and the ambient air are fully mixed and colored smoke plumes appear; a plurality of stages of water drop collecting nets and ion emitters are arranged in the water drop catching chamber; the water collecting pump is respectively connected with the bottom of the mist generation chamber and the bottom of the water drop catching chamber through pipelines.
Preferably, the water drop collecting net and the ion emitter are made of stainless steel.
Preferably, the surface of the water droplet collecting net is coated with a hydrophobic coating to accelerate the removal of the collected water droplets.
Preferably, the ion emitter is connected with the negative electrode of the direct current power supply, the positive electrode of the direct current power supply is grounded, and the water drop collecting net is grounded.
Preferably, the voltage of the ion emitter is adjustable.
Compared with the prior art, the device realizes the treatment of the colored smoke plume under the condition of lower initial investment and operation cost. The system of the invention has no huge heat exchanger or heater, and can greatly reduce the cost. In the testing process of the prototype, the power consumption of the direct current power supply is very small.
Drawings
FIG. 1 is a diagram showing the structure of a device according to the present invention
Fig. 2 is a schematic diagram of the operation of the drip chamber of the present invention.
In the figure: 1-a mist generating chamber; 2-a droplet catching chamber; 3-a flue gas inlet; 4-ambient air inlet; 5-mixed gas outlet; 6-a variable frequency fan; 7-a turbulent fan; 8-a water droplet collection net; 9-an ion emitter; 10-a ground terminal; 11-a direct current power supply; 12-a temperature and humidity sensor; 13-a flow meter; 14-collecting water pump; 15-charged droplets; a-flue gas; b-ambient air; c-treating the flue gas air mixture; d-water-gas mixture.
Detailed Description
Spatially relative terms, such as "above … …," "above … …," "above … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial relationship to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary term "above … …" can include both an orientation of "above … …" and "below … …". The device may be otherwise variously oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
As shown in fig. 1-2, the device for eliminating colored smoke plume by electrostatic drive of space charge injection comprises a fog generating chamber 1, a water drop catching chamber 2, a variable frequency fan 6, a turbulent fan 7, a water drop collecting net 8, an ion emitter 9, a direct current power supply 11, a heat humidity sensor 12, a flowmeter 13 and a water collecting pump 14. The fog generating chamber is communicated with the water drop catching chamber, a flue gas inlet and an ambient air inlet are formed in the fog generating chamber, the frequency conversion fan is installed in the ambient air inlet, and the frequency conversion fan 6 is used for adjusting the flow of ambient air entering the fog generating chamber according to the flow and the state of the flue gas.
The fan blades of the turbulent fan are positioned in the fog generating chamber and are used for enhancing the mixing of the smoke and the outside air, and the smoke and the outside air are fully mixed and have colored smoke plumes under the action of the turbulent fan; the water drop collecting net and the ion emitter are arranged in multiple stages in the water drop catching chamber, and are not limited to the two stages in fig. 1.
The water collecting pump is respectively connected with the bottom of the mist generation chamber and the bottom of the water drop catching chamber through pipelines. Colored smoke plume generated by the fog generating chamber enters the water drop catching chamber 2, water drops in the mixed gas are injected with net charges by the ion emitter 9 in the water drop catching chamber 2, the water drops 15 with the charges move to the water drop collecting net 8 grounded 10 under the action of an electric field and are caught, and the water drops fall off under the action of gravity after growing to a certain size. The liquid water captured by the water droplet collecting net 8 is drained by the collected water pump 14.
The ion emitter 9 is connected with the negative pole of the direct current power supply 11, and the positive pole of the direct current power supply 11 is grounded. The water droplet collecting net 8 is well grounded. The voltage of the ion emitter 9 is adjustable in order to adjust the voltage correspondingly according to the amount of colored smoke plume.
The working process of the invention is as follows: the flue gas a enters the fog generating chamber 1 at the flue gas inlet 3, and the ambient air b enters the fog generating chamber 1 from the ambient air inlet 4.
The flow of the ambient air b is controlled by the variable frequency fan 6, and the control idea is as follows: and adjusting the flow of the ambient air b in real time according to the parameters of the flue gas a measured by the flowmeter 13 and the hygrothermograph 12.
The flue gas a and the ambient air b are mixed in the fog generating chamber 1, and the state point is ensured to be in the oversaturation area of the mixed gas, so that a 'tiny water drop-gas' mixture d, namely colored smoke plume is generated. In order to enhance the mixing of the flue gas a and the ambient air b, a turbulent fan 7 is used for stirring, and then the colored smoke plume enters the water drop catching chamber 2.
In the water drop catching chamber 2, water drops in the mixed gas are injected with net charges by the ion emitter 9, under the action of an electric field, the charged water drops 15 move to the water drop collecting net 8 grounded 10 and are caught, and when the water drops grow to a certain size, the water drops fall off under the action of gravity, and the principle diagram is shown in figure 2.
The ion emitter 9 is connected with the negative pole of the direct current power supply 11, and the positive pole of the direct current power supply 11 is grounded. The dehydrated mixed gas c is discharged to the atmosphere through the outlet 5. It should be noted that, depending on the amount of flue gas, the moisture content of flue gas, and the ambient air temperature, the water droplet catching chamber 2 may be provided with a plurality of stages of water droplet collecting nets 8 and ion emitters 9, which are not limited to the two stages in fig. 1.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (5)
1. A device for eliminating colored smoke plume by utilizing electrostatic drive of space charge injection is characterized in that: the device comprises a fog generating chamber, a water drop catching chamber, a variable frequency fan, a turbulent flow fan, a water drop collecting net, an ion emitter and a water collecting pump; the fog generating chamber is communicated with the water drop catching chamber, a smoke inlet and an ambient air inlet are formed in the fog generating chamber, the variable frequency fan is installed in the ambient air inlet, fan blades of the turbulent fan are located in the fog generating chamber and used for enhancing mixing of smoke and ambient air, and under the action of the turbulent fan, the smoke and the ambient air are fully mixed and colored smoke plumes appear; a plurality of stages of water drop collecting nets and ion emitters are arranged in the water drop catching chamber; the water collecting pump is respectively connected with the bottom of the mist generation chamber and the bottom of the water drop catching chamber through pipelines.
2. The electrostatic driving colored plume elimination device using space charge injection as claimed in claim 1, wherein a combination of multi-stage ion emitters and water droplet collection net is provided.
3. The electrostatic driving colored plume elimination device using space charge injection as claimed in claim 1, wherein: the surface of the water drop collecting net is coated with a hydrophobic coating, so that the drainage of the collected water drops is accelerated.
4. The electrostatic driving colored plume elimination device using space charge injection as claimed in claim 1, wherein: the ion emitter is connected with the negative electrode of the direct current power supply, the positive electrode of the direct current power supply is grounded, and the water drop collecting net is grounded.
5. The apparatus for eliminating or reducing colored plume of claim 1, wherein the ion emitter voltage is adjustable.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911343189.3A CN110976091A (en) | 2019-12-24 | 2019-12-24 | Device for eliminating colored smoke plume by utilizing electrostatic drive of space charge injection |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911343189.3A CN110976091A (en) | 2019-12-24 | 2019-12-24 | Device for eliminating colored smoke plume by utilizing electrostatic drive of space charge injection |
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| CN110976091A true CN110976091A (en) | 2020-04-10 |
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| CN201911343189.3A Pending CN110976091A (en) | 2019-12-24 | 2019-12-24 | Device for eliminating colored smoke plume by utilizing electrostatic drive of space charge injection |
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1123670A (en) * | 1966-01-03 | 1968-08-14 | Donald Norman Hanson | Improvements in or relating to electrostatic precipitation |
| CN207928911U (en) * | 2017-12-29 | 2018-10-02 | 福建龙净环保股份有限公司 | A kind of wet plume elimination system |
| CN109126366A (en) * | 2018-11-06 | 2019-01-04 | 中冶赛迪工程技术股份有限公司 | A kind of energy-efficient coloured plume governing system |
| CN109529512A (en) * | 2018-12-24 | 2019-03-29 | 浙江菲达环保科技股份有限公司 | A kind of integrated tower removing white plume and multiple pollutant |
| CN209093063U (en) * | 2018-10-22 | 2019-07-12 | 上海洁懋环境科技工程有限公司 | A kind of coloured plume cancellation element of sintering flue gas |
| CN110035828A (en) * | 2016-12-09 | 2019-07-19 | 三星电子株式会社 | Electric dust collecting means and humidifying air clarifier including the electric dust collecting means |
| US20190358646A1 (en) * | 2018-05-27 | 2019-11-28 | Abdurahman Hosseinifar | Apparatus and method for purification of air |
| CN211801635U (en) * | 2019-12-24 | 2020-10-30 | 天津商业大学 | Device for eliminating colored smoke plume by utilizing electrostatic drive of space charge injection |
-
2019
- 2019-12-24 CN CN201911343189.3A patent/CN110976091A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1123670A (en) * | 1966-01-03 | 1968-08-14 | Donald Norman Hanson | Improvements in or relating to electrostatic precipitation |
| CN110035828A (en) * | 2016-12-09 | 2019-07-19 | 三星电子株式会社 | Electric dust collecting means and humidifying air clarifier including the electric dust collecting means |
| CN207928911U (en) * | 2017-12-29 | 2018-10-02 | 福建龙净环保股份有限公司 | A kind of wet plume elimination system |
| US20190358646A1 (en) * | 2018-05-27 | 2019-11-28 | Abdurahman Hosseinifar | Apparatus and method for purification of air |
| CN209093063U (en) * | 2018-10-22 | 2019-07-12 | 上海洁懋环境科技工程有限公司 | A kind of coloured plume cancellation element of sintering flue gas |
| CN109126366A (en) * | 2018-11-06 | 2019-01-04 | 中冶赛迪工程技术股份有限公司 | A kind of energy-efficient coloured plume governing system |
| CN109529512A (en) * | 2018-12-24 | 2019-03-29 | 浙江菲达环保科技股份有限公司 | A kind of integrated tower removing white plume and multiple pollutant |
| CN211801635U (en) * | 2019-12-24 | 2020-10-30 | 天津商业大学 | Device for eliminating colored smoke plume by utilizing electrostatic drive of space charge injection |
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