CN110052155A - A kind of Hg, SO3The system with low-low temperature ESP of cooperation-removal - Google Patents
A kind of Hg, SO3The system with low-low temperature ESP of cooperation-removal Download PDFInfo
- Publication number
- CN110052155A CN110052155A CN201910255841.XA CN201910255841A CN110052155A CN 110052155 A CN110052155 A CN 110052155A CN 201910255841 A CN201910255841 A CN 201910255841A CN 110052155 A CN110052155 A CN 110052155A
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- China
- Prior art keywords
- flying dust
- low temperature
- dry powder
- low
- feed bin
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000000428 dust Substances 0.000 claims abstract description 62
- 238000002347 injection Methods 0.000 claims abstract description 41
- 239000007924 injection Substances 0.000 claims abstract description 41
- 239000000843 powder Substances 0.000 claims abstract description 32
- 238000002407 reforming Methods 0.000 claims abstract description 24
- OKTJSMMVPCPJKN-UHFFFAOYSA-N carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 18
- 239000007789 gas Substances 0.000 claims abstract description 17
- 238000005507 spraying Methods 0.000 claims abstract description 13
- 230000003009 desulfurizing Effects 0.000 claims abstract description 4
- 239000003517 fume Substances 0.000 claims abstract description 4
- 239000003546 flue gas Substances 0.000 claims description 11
- UGFAIRIUMAVXCW-UHFFFAOYSA-N carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 10
- 239000000126 substance Substances 0.000 claims description 9
- 229910052799 carbon Inorganic materials 0.000 claims description 8
- 239000003795 chemical substances by application Substances 0.000 claims description 7
- 239000003814 drug Substances 0.000 claims description 7
- 230000005684 electric field Effects 0.000 claims description 7
- 150000002366 halogen compounds Chemical class 0.000 claims description 6
- 239000003818 cinder Substances 0.000 claims description 4
- 239000007921 spray Substances 0.000 claims description 4
- 239000002994 raw material Substances 0.000 claims description 3
- 230000000694 effects Effects 0.000 claims description 2
- 239000003610 charcoal Substances 0.000 claims 1
- 239000005864 Sulphur Substances 0.000 abstract description 9
- 239000003245 coal Substances 0.000 abstract description 9
- NINIDFKCEFEMDL-UHFFFAOYSA-N sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 abstract description 9
- 239000002956 ash Substances 0.000 abstract 1
- 239000010882 bottom ash Substances 0.000 abstract 1
- 239000002585 base Substances 0.000 description 23
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 4
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 description 3
- 229910052753 mercury Inorganic materials 0.000 description 3
- 239000003595 mist Substances 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 2
- 230000005591 charge neutralization Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000001264 neutralization Effects 0.000 description 2
- 238000006386 neutralization reaction Methods 0.000 description 2
- 230000001131 transforming Effects 0.000 description 2
- BCQZXOMGPXTTIC-UHFFFAOYSA-N Halothane Chemical compound FC(F)(F)C(Cl)Br BCQZXOMGPXTTIC-UHFFFAOYSA-N 0.000 description 1
- 229960003132 Halothane Drugs 0.000 description 1
- 229910002089 NOx Inorganic materials 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 238000003915 air pollution Methods 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 230000003321 amplification Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 229940079593 drugs Drugs 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 239000003500 flue dust Substances 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 229910052736 halogen Inorganic materials 0.000 description 1
- 150000002367 halogens Chemical class 0.000 description 1
- PNDPGZBMCMUPRI-UHFFFAOYSA-N iodine Chemical compound II PNDPGZBMCMUPRI-UHFFFAOYSA-N 0.000 description 1
- 229910052740 iodine Inorganic materials 0.000 description 1
- 239000011630 iodine Substances 0.000 description 1
- 238000002386 leaching Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- MYMOFIZGZYHOMD-UHFFFAOYSA-N oxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 238000005453 pelletization Methods 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/48—Sulfur compounds
- B01D53/50—Sulfur oxides
- B01D53/508—Sulfur oxides by treating the gases with solids
-
- 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
- B01D53/46—Removing components of defined structure
- B01D53/64—Heavy metals or compounds thereof, e.g. mercury
-
- 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
- B01D53/81—Solid phase processes
- B01D53/83—Solid phase processes with moving reactants
-
- 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
- B03C3/88—Cleaning-out collected particles
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J15/00—Arrangements of devices for treating smoke or fumes
- F23J15/02—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/60—Heavy metals or heavy metal compounds
- B01D2257/602—Mercury or mercury compounds
-
- 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 proposes a kind of Hg, SO3The system with low-low temperature ESP of cooperation-removal, including the boiler set gradually by fume treatment flow direction, SCR denitration system, air preheater, gas cooler, low temperature electric precipitator, desulfurizing tower and chimney, it further include modified flying dust spraying system and base dry powder spraying system, the modified flying dust spraying system includes grey library, flying dust reforming apparatus, flying dust feed bin and flying dust injection apparatus, the output end of the bottom ash bucket of the low temperature electric precipitator is connected with grey library, one of ash bucket is connected with flying dust reforming apparatus, the ejection end of flying dust injection apparatus is set to the inlet end of gas cooler, the base dry powder spraying system includes pretreatment unit, base dry powder feed bin and base dry powder injection apparatus, the ejection end of base dry powder injection apparatus is arranged in the outlet side of gas cooler.While with dedusting function, Hg, SO are had both3Efficient removal function, particularly suitable sulphur coal or the relatively low engineering of grey sulphur.
Description
[technical field]
The present invention relates to the technical field of purifying coal-fired flue gas, especially a kind of Hg, SO3The low low temperature electric of cooperation-removal removes
Dirt system.
[background technique]
The raising of coal-burning power plant's smoke contamination controlled level, to improving, urban air quality status in China's is most important.Mirror
In the great environment of Particulate Pollution and social influence, three ministries and commissions such as National Development and Reform Committee, which combine, prints and distributes " coal electricity energy-saving and emission-reduction upgrading
With transformation action plan (2014~the year two thousand twenty) ", clear stipulaties eastern region creates Thermal generation unit atmosphere pollution row
It puts concentration and basically reaches gas turbine group standard limited value, i.e., under the conditions of benchmark oxygen content 6%, flue dust, SO2、NOxConcentration of emission point
It Bu Gaoyu not 10mg/m3、35mg/m3、50mg/m3, west area new-built unit is encouraged to be close to or up to gas turbine group standard limit
Value.Minimum discharge has become the theme of coal unit pollution control.
Artificial mercury emissions are mostly derived from fire coal, and coal is the main fuel energy of China, and coal fired power plant discharge becomes mercury
Primary discharge source, resulting fire coal mercury pollution is increasingly by domestic concern.Compared to other pollutants, coal-burning boiler
Discharge SO in flue gas3Concentration it is lower, but biggish harm can be generated to flue downstream equipment and atmospheric environment.SO3By spray
Sulfuric acid mist can be formed in conjunction with steam after leaching tower, easily corrode the pipe-line equipment of flue tail.Flue gas discharge not up to standard is to make
The main reason at air pollution.Coal-burning power plant is at present to SO3Removing with Hg is all that individual removing system is respectively adopted, very
A kind of rare system can complete SO3It is removed with the joint of Hg, it is proposed that a kind of Hg, SO3The low temperature electric precipitation system of cooperation-removal
System.
[summary of the invention]
The object of the invention is to solve the problems of the prior art, a kind of Hg, SO are proposed3The low low temperature electric of cooperation-removal
Dust pelletizing system has both Hg, SO while with dedusting function3Efficient removal function, especially suitable for sulphur coal or grey sulphur
Relatively low engineering.
To achieve the above object, the invention proposes a kind of Hg, SO3The system with low-low temperature ESP of cooperation-removal, including
Boiler, SCR denitration system, air preheater, gas cooler, the low low temperature electric set gradually by fume treatment flow direction removes
Dirt device, desulfurizing tower and chimney further include modified flying dust spraying system and base dry powder spraying system, the modified flying dust injection system
System includes grey library, flying dust reforming apparatus, flying dust feed bin and flying dust injection apparatus, if the bottom of the low temperature electric precipitator is equipped with
A dry ash bucket, the output end of each ash bucket are connected with grey library, and the output end of one of ash bucket is defeated with flying dust reforming apparatus
Enter end to be connected, the ejection end of the flying dust injection apparatus is set to the inlet end of gas cooler, the base dry powder injection
System includes pretreatment unit, base dry powder feed bin and base dry powder injection apparatus, the injection of the base dry powder injection apparatus
End is arranged in the outlet side of gas cooler.
Preferably, the output end of the flying dust reforming apparatus is connected with flying dust feed bin, the output of the flying dust feed bin
End is connected with flying dust injection apparatus.
Preferably, being connected with modifying agent storage bin on the flying dust reforming apparatus, the modifying agent storage bin is flying dust
Reforming apparatus provides halogen compounds medicament, and the discharge end of the first electric field ash bucket of the low temperature electric precipitator is connected with defeated ash
Pipeline, the input terminal of the flying dust reforming apparatus with the output end of ash handing pipeline be connected, in the flying dust reforming apparatus also
It is ground using the cinder of the first electric field ash bucket of low temperature electric precipitator as raw material by flying dust reforming apparatus equipped with grinding device
It grinds and to be aided with halogen compounds medicament mixed and modified.
Preferably, being also connected with active carbon injection device on the flying dust feed bin, the active carbon injection device is winged
Grey feed bin provides active carbon.
Preferably, the output end of the pretreatment unit is connected with base dry powder feed bin, the base dry powder feed bin
Output end is connected with base dry powder injection apparatus.
Preferably, base substance injection device is also connected on the pretreatment unit, the base substance injection dress
It is set to pretreatment unit and base substance is provided.
Beneficial effects of the present invention:, can before the present invention is arranged in gas cooler by will be modified flying dust injection apparatus
Gaseous state Hg in flue gas is adsorbed, it, can be to condensed sulphur after base dry powder injection apparatus is arranged in gas cooler
Acid mist carries out absorption neutralization, especially suitable for sulphur coal (Sar > 2%) or grey sulphur ratio (D/S) lower engineering, with dedusting
While function, Hg, SO are had both3Efficient removal function.
Feature and advantage of the invention will be described in detail by embodiment combination attached drawing.
[Detailed description of the invention]
Fig. 1 is the present invention a kind of Hg, SO3The structural schematic diagram of the system with low-low temperature ESP of cooperation-removal；
Fig. 2 is the present invention a kind of Hg, SO3The amplification of the part-structure of the system with low-low temperature ESP of cooperation-removal is illustrated
Figure.
[specific embodiment]
Refering to fig. 1 with Fig. 2 present invention a kind of Hg, SO3The system with low-low temperature ESP of cooperation-removal, including press fume treatment
Boiler 1 that flow direction is set gradually, SCR denitration system 2, air preheater 3, gas cooler 4, low temperature electric precipitator 5,
Desulfurizing tower 6 and chimney 7 further include modified flying dust spraying system and base dry powder spraying system, the modified flying dust spraying system
Including grey library 8, flying dust reforming apparatus 9, flying dust feed bin 10 and flying dust injection apparatus 11, the bottom of the low temperature electric precipitator 5
Equipped with several ash buckets, the output end of each ash bucket is connected with grey library 8, and the output end and flying dust of one of ash bucket are modified to be filled
It sets 9 input terminal to be connected, the ejection end of the flying dust injection apparatus 11 is set to the inlet end of gas cooler 4, the alkali
Backbone powder spraying system includes pretreatment unit 12, base dry powder feed bin 13 and base dry powder injection apparatus 14, and the base is dry
The ejection end of powder injection apparatus 14 is arranged in the outlet side of gas cooler 4.The output end and flying dust of the flying dust reforming apparatus 9
Feed bin 10 is connected, and the output end of the flying dust feed bin 10 is connected with flying dust injection apparatus 11.On the flying dust reforming apparatus 9
It is connected with modifying agent storage bin 91, the modifying agent storage bin 91 is that flying dust reforming apparatus 9 provides halogen compounds medicament, described
The discharge end of first electric field ash bucket 51 of low temperature electric precipitator 5 is connected with ash handing pipeline 52, the flying dust reforming apparatus 9 it is defeated
Enter end with the output end of ash handing pipeline 52 be connected, grinding device is additionally provided in the flying dust reforming apparatus 9, with low low temperature electric
The cinder of first electric field ash bucket 51 of deduster 5 is raw material, is ground by flying dust reforming apparatus 9 and is aided with halogen compounds medicine
Agent is mixed and modified.Active carbon injection device is also connected on the flying dust feed bin 10, the active carbon injection device is flying dust material
Storehouse 10 provides active carbon.The output end of the pretreatment unit 12 is connected with base dry powder feed bin 13, the base dry powder feed bin
13 output end is connected with base dry powder injection apparatus 14.Base substance injection dress is also connected on the pretreatment unit 12
It sets, the base substance injection device is that pretreatment unit 12 provides base substance.
The course of work of the present invention:
The present invention a kind of Hg, SO3The working principle of the system with low-low temperature ESP of cooperation-removal are as follows: modified flying dust injection dress
It sets before being arranged in gas cooler, using the cinder of the 1st electric field of low temperature electric precipitator as basic material, is galled through mechanical grinding
It is blended after broken with halogen (Halothane iodine etc.) compound drug, sprays into flue gas the gaseous state Hg adsorbed in flue gas.Flue gas is cold
But flue-gas temperature is down to 90 DEG C hereinafter, the SO3 in flue gas is sufficiently condensed by device from 130 DEG C or so.Base dry powder injection apparatus
After being arranged in gas cooler, the appropriate alkalinity dry powder that sprays into effectively can carry out absorption neutralization to condensed sulfuric acid mist, especially suitable
For sulphur coal (Sar > 2%) or grey sulphur ratio (D/S) lower engineering.While with dedusting function, Hg, SO are had both3's
Efficient removal function, the 5 μ g/m of Hg concentration < of low low temperature electric house outlet flue gas3, SO3 is less than 1ppm
Above-described embodiment is the description of the invention, is not limitation of the invention, after any pair of simple transformation of the present invention
Scheme all belong to the scope of protection of the present invention.
Claims (6)
1. a kind of Hg, SO3The system with low-low temperature ESP of cooperation-removal, it is characterised in that: including by fume treatment flow direction according to
The boiler (1) of secondary setting, SCR denitration system (2), air preheater (3), gas cooler (4), low temperature electric precipitator (5),
Desulfurizing tower (6) and chimney (7) further include modified flying dust spraying system and base dry powder spraying system, the modified flying dust injection
System includes that grey library (8), flying dust reforming apparatus (9), flying dust feed bin (10) and flying dust injection apparatus (11), the low low temperature electric remove
The bottom of dirt device (5) is equipped with several ash buckets, and the output end of each ash bucket is connected with grey library (8), one of ash bucket it is defeated
Outlet is connected with the input terminal of flying dust reforming apparatus (9), and it is cold that the ejection end of the flying dust injection apparatus (11) is set to flue gas
But the inlet end of device (4), the base dry powder spraying system include pretreatment unit (12), base dry powder feed bin (13) and base
The ejection end of dry powder injection apparatus (14), the base dry powder injection apparatus (14) is arranged in the outlet side of gas cooler (4).
2. a kind of Hg, SO as described in claim 13The system with low-low temperature ESP of cooperation-removal, it is characterised in that: described to fly
The output end of grey reforming apparatus (9) is connected with flying dust feed bin (10), and the output end and flying dust of the flying dust feed bin (10) spray
Device (11) is connected.
3. a kind of Hg, SO as claimed in claim 1 or 23The system with low-low temperature ESP of cooperation-removal, it is characterised in that: described
It is connected on flying dust reforming apparatus (9) modifying agent storage bin (91), the modifying agent storage bin (91) is flying dust reforming apparatus (9)
Halogen compounds medicament is provided, the discharge end of the first electric field ash bucket (51) of the low temperature electric precipitator (5) is connected with defeated ash
Pipeline (52), the input terminal of the flying dust reforming apparatus (9) with the output end of ash handing pipeline (52) be connected, the flying dust changes
Property device (9) in be additionally provided with grinding device, using the cinder of the first electric field ash bucket (51) of low temperature electric precipitator (5) as raw material,
It is ground by flying dust reforming apparatus (9) and to be aided with halogen compounds medicament mixed and modified.
4. a kind of Hg, SO as claimed in claim 1 or 23The system with low-low temperature ESP of cooperation-removal, it is characterised in that: described
Active carbon injection device is also connected on flying dust feed bin (10), the active carbon injection device is that flying dust feed bin (10) provide activity
Charcoal.
5. a kind of Hg, SO as described in claim 13The system with low-low temperature ESP of cooperation-removal, it is characterised in that: described pre-
The output end of processing unit (12) is connected with base dry powder feed bin (13), the output end and base of the base dry powder feed bin (13)
Dry powder injection apparatus (14) is connected.
6. a kind of Hg, SO as claimed in claim 53The system with low-low temperature ESP of cooperation-removal, it is characterised in that: described pre-
Base substance injection device is also connected in processing unit (12), the base substance injection device is that pretreatment unit (12) mention
For base substance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910255841.XA CN110052155A (en) | 2019-04-01 | 2019-04-01 | A kind of Hg, SO3The system with low-low temperature ESP of cooperation-removal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910255841.XA CN110052155A (en) | 2019-04-01 | 2019-04-01 | A kind of Hg, SO3The system with low-low temperature ESP of cooperation-removal |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110052155A true CN110052155A (en) | 2019-07-26 |
Family
ID=67317944
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910255841.XA Pending CN110052155A (en) | 2019-04-01 | 2019-04-01 | A kind of Hg, SO3The system with low-low temperature ESP of cooperation-removal |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110052155A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110631004A (en) * | 2019-10-29 | 2019-12-31 | 华北电力大学 | Boiler system and method for reducing contamination and coking of high-sodium coal and removing heavy metal |
| CN110975590A (en) * | 2019-12-10 | 2020-04-10 | 华北电力大学 | Coal-fired system and method for removing sulfur trioxide and mercury by using modified fly ash |
| CN111068504A (en) * | 2019-12-25 | 2020-04-28 | 华北电力大学 | Method and device for removing heavy metal and VOC (volatile organic compounds) by using modified fly ash |
-
2019
- 2019-04-01 CN CN201910255841.XA patent/CN110052155A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110631004A (en) * | 2019-10-29 | 2019-12-31 | 华北电力大学 | Boiler system and method for reducing contamination and coking of high-sodium coal and removing heavy metal |
| CN110975590A (en) * | 2019-12-10 | 2020-04-10 | 华北电力大学 | Coal-fired system and method for removing sulfur trioxide and mercury by using modified fly ash |
| CN111068504A (en) * | 2019-12-25 | 2020-04-28 | 华北电力大学 | Method and device for removing heavy metal and VOC (volatile organic compounds) by using modified fly ash |
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