CN110449021B - WESP device for efficiently removing heavy metals by combining two-stage adsorption and two-stage spraying - Google Patents
WESP device for efficiently removing heavy metals by combining two-stage adsorption and two-stage spraying Download PDFInfo
- Publication number
- CN110449021B CN110449021B CN201910748111.3A CN201910748111A CN110449021B CN 110449021 B CN110449021 B CN 110449021B CN 201910748111 A CN201910748111 A CN 201910748111A CN 110449021 B CN110449021 B CN 110449021B
- Authority
- CN
- China
- Prior art keywords
- stage
- heavy metals
- area
- zone
- adsorption
- 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.)
- Active
Links
- 238000005507 spraying Methods 0.000 title claims abstract description 76
- 229910001385 heavy metal Inorganic materials 0.000 title claims abstract description 71
- 238000001179 sorption measurement Methods 0.000 title claims abstract description 57
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 54
- 239000003546 flue gas Substances 0.000 claims abstract description 54
- 239000011669 selenium Substances 0.000 claims abstract description 42
- 239000000428 dust Substances 0.000 claims abstract description 31
- BUGBHKTXTAQXES-UHFFFAOYSA-N Selenium Chemical compound [Se] BUGBHKTXTAQXES-UHFFFAOYSA-N 0.000 claims abstract description 23
- 229910052785 arsenic Inorganic materials 0.000 claims abstract description 23
- RQNWIZPPADIBDY-UHFFFAOYSA-N arsenic atom Chemical compound [As] RQNWIZPPADIBDY-UHFFFAOYSA-N 0.000 claims abstract description 23
- 229910052711 selenium Inorganic materials 0.000 claims abstract description 23
- 239000000779 smoke Substances 0.000 claims abstract description 15
- 239000003595 mist Substances 0.000 claims abstract description 6
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims description 34
- UIIMBOGNXHQVGW-UHFFFAOYSA-M Sodium bicarbonate Chemical compound [Na+].OC([O-])=O UIIMBOGNXHQVGW-UHFFFAOYSA-M 0.000 claims description 24
- 239000002245 particle Substances 0.000 claims description 23
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 18
- 229910000029 sodium carbonate Inorganic materials 0.000 claims description 17
- 229910000030 sodium bicarbonate Inorganic materials 0.000 claims description 12
- 235000017557 sodium bicarbonate Nutrition 0.000 claims description 12
- UIIMBOGNXHQVGW-DEQYMQKBSA-M Sodium bicarbonate-14C Chemical compound [Na+].O[14C]([O-])=O UIIMBOGNXHQVGW-DEQYMQKBSA-M 0.000 claims description 10
- 150000001875 compounds Chemical class 0.000 claims description 10
- 238000010926 purge Methods 0.000 claims description 10
- 239000007921 spray Substances 0.000 claims description 10
- 239000000126 substance Substances 0.000 claims description 10
- 239000005708 Sodium hypochlorite Substances 0.000 claims description 9
- SUKJFIGYRHOWBL-UHFFFAOYSA-N sodium hypochlorite Chemical compound [Na+].Cl[O-] SUKJFIGYRHOWBL-UHFFFAOYSA-N 0.000 claims description 9
- 238000006243 chemical reaction Methods 0.000 claims description 5
- 239000012717 electrostatic precipitator Substances 0.000 claims description 4
- 239000000843 powder Substances 0.000 claims description 4
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims description 3
- 239000012719 wet electrostatic precipitator Substances 0.000 abstract description 13
- 239000007788 liquid Substances 0.000 description 14
- 239000002923 metal particle Substances 0.000 description 8
- 230000000694 effects Effects 0.000 description 7
- 239000010865 sewage Substances 0.000 description 6
- 239000003245 coal Substances 0.000 description 5
- 239000007789 gas Substances 0.000 description 4
- 229920006395 saturated elastomer Polymers 0.000 description 4
- 239000003344 environmental pollutant Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 231100000719 pollutant Toxicity 0.000 description 3
- AKHNMLFCWUSKQB-UHFFFAOYSA-L sodium thiosulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=S AKHNMLFCWUSKQB-UHFFFAOYSA-L 0.000 description 3
- 235000019345 sodium thiosulphate Nutrition 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000005367 electrostatic precipitation Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 241000282414 Homo sapiens Species 0.000 description 1
- 239000000443 aerosol Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 244000005700 microbiome Species 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 238000010408 sweeping Methods 0.000 description 1
- 238000012360 testing method Methods 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
-
- 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
- B01D53/77—Liquid phase processes
- B01D53/78—Liquid phase processes with gas-liquid contact
-
- 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
- B01D53/82—Solid phase processes with stationary 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
- B03C3/017—Combinations of electrostatic separation with other processes, not otherwise provided for
-
- 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
- B03C3/04—Plant or installations having external electricity supply dry 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
- B03C3/74—Cleaning the electrodes
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/55—Compounds of silicon, phosphorus, germanium or arsenic
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Health & Medical Sciences (AREA)
- Biomedical Technology (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Treating Waste Gases (AREA)
Abstract
The invention relates to a WESP device for efficiently removing heavy metals by combining double-stage adsorption and double-stage spraying, which is provided with a smoke inlet and a smoke outlet, wherein a first-stage adsorption area, a double-stage spraying area, an electrostatic dust removal area and a second-stage adsorption area are sequentially arranged between the smoke inlet and the smoke outlet along the smoke flow direction, the double-stage spraying area and the electrostatic dust removal area are sequentially arranged from bottom to top, and a pollution discharge area is arranged below the double-stage adsorption area; the two-stage spraying area is provided with a first-stage spraying area and a second-stage spraying area which are sequentially arranged from bottom to top, and a mist removing area is arranged between the first-stage spraying area and the second-stage spraying area. Compared with the prior art, after the flue gas is cooperatively treated by the wet electrostatic precipitator provided with the double-stage adsorption and double-stage spraying, heavy metals such as arsenic, selenium, lead and the like in various forms in the flue gas can be efficiently removed and purified.
Description
Technical Field
The invention relates to the technical field of wet electrostatic precipitators (WESP), in particular to a WESP device for efficiently removing heavy metals by combining double-stage adsorption and double-stage spraying.
Background
Along with the development of economy, the demands of industrial production and people living on electric power are continuously improved. Although China is advocating energy-saving power generation, new energy development and other measures, the energy structure mainly based on coal in China cannot be changed in a short time.
China is the largest coal producing country in the world and also the largest coal consuming country, and coal accounts for about 70% of the energy structures at present. However, a large amount of SO x、NOx and heavy metals are generated after coal combustion, wherein heavy metals such as arsenic, selenium and lead are harmful, the heavy metals are mainly concentrated on submicron particles and are difficult to be effectively captured by conventional pollutant control facilities, the heavy metals mainly exist in an aerosol form in the atmosphere and are difficult to settle, and most of the harmful heavy metals are difficult to be degraded by microorganisms and stay in the atmosphere for a long time, SO that great harm is caused to ecosystems and human beings.
The research on how the purification device of the coal-fired power plant controls heavy metals is started later, the research direction in the prior art is mainly to measure the content of the heavy metals in the flue gas, but how to improve the removal efficiency of the heavy metals in the flue gas and strengthen the removal effect of the heavy metals in the flue gas, so that a solution for realizing the high-efficiency removal of the heavy metals is still not perfect.
Therefore, in order to reduce the emission of heavy metal pollutants in the atmosphere of a coal-fired power plant, form conversion, distribution and control of heavy metals in the coal-fired process are carried out, and various technologies for removing particulate matters, heavy metals and the like in flue gas are required to be developed. Chinese patent CN108201974a discloses a wet electrostatic precipitator, which comprises a cleaning component and a case, one side of the case is provided with an air inlet, the top of the case is provided with an air outlet, and a sedimentation tank is arranged below the case. The technical scheme has the defects that the heavy metal removal process is single, the grading treatment cannot be realized, and the removal rate is low.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a WESP device for efficiently removing heavy metals by combining double-stage adsorption and double-stage spraying.
The aim of the invention can be achieved by the following technical scheme:
The WESP device is characterized in that a first-stage adsorption zone, a second-stage spraying zone, an electrostatic dust removal zone and a second-stage adsorption zone are sequentially arranged between the flue gas inlet and the flue gas outlet along the flue gas flowing direction, the two-stage spraying zone and the electrostatic dust removal zone are sequentially arranged from bottom to top, and a pollution discharge zone is arranged below the two-stage adsorption zone;
The two-stage spraying area is provided with a first-stage spraying area and a second-stage spraying area which are sequentially arranged from bottom to top, and a mist removing area is arranged between the first-stage spraying area and the second-stage spraying area.
As a preferred technical scheme, the primary adsorption zone is provided with an adsorption bed of micron-sized porous sodium carbonate and sodium bicarbonate, and is used for adsorbing granular heavy metals, the granular heavy metals are oxidized (for example, as 3+ is converted into As 5+, se 0 is converted into Se 4+, pb 0 is converted into Pb 2 +) by utilizing active oxides (such As sodium thiosulfate and the like) generated by the reaction of SO 2 in flue gas and the sodium bicarbonate, and the granular heavy metals comprise granular As p、Sep and Pb p.
As an optimal technical scheme, the first-stage spraying area is used for enabling the flue gas to be in contact with sodium hypochlorite solution sprayed by the first-stage spraying area, and heavy metals including arsenic, selenium and lead are further oxidized by utilizing sodium hypochlorite.
As a preferred technical scheme, the secondary spraying area is used for enabling the flue gas to be in contact with a solution prepared from sodium carbonate and sodium bicarbonate powder sprayed by the secondary spraying area, and granular, simple substance state and compound state heavy metals are further removed by utilizing the sodium carbonate and the sodium bicarbonate, wherein the granular heavy metals comprise granular As p、Sep and Pb p, the simple substance state heavy metals comprise simple substance state Se 0 and Pb 0, and the compound state heavy metals comprise compound state As 3+、As5+、Se4+ and Pb 2+.
As a preferable technical scheme, the mass ratio of the sodium carbonate to the sodium bicarbonate is 1:1-3.
As a preferable technical scheme, the spray particle size of the primary spraying area and the secondary spraying area is 10 mu m-200 mu m.
As a preferable technical scheme, the demister is provided with a demister, and the demister is used for treating fine dust particles, fog particles and wet gas saturated by liquid steam.
As the preferable technical scheme, the sewage disposal area is provided with an ash bucket and a sewage disposal outlet. Is used for collecting heavy metal particles such as arsenic, selenium, lead and the like.
As a preferable technical scheme, the electrostatic dust collection area is provided with a central shaft, and anodes and cathodes which are alternately arranged and connected with the central shaft, wherein the cathodes are provided with barbs, and the anodes and the cathodes are driven by the central shaft to periodically rotate along with the central shaft. The dust removing effect of the electrostatic dust removing area is improved, and the particle removing effect of arsenic, selenium, lead and the like formed by spraying and liquid drops can be further improved.
As the preferable technical scheme, the electrostatic dust collection area is also provided with a purging component, the purging component is a high-pressure air injector and is positioned above the anode and the cathode, and the purging component is used for purging particles adsorbed on the electrode plates of the electrostatic dust collection area so as to enable the particles to fall to the pollution discharge area.
As a preferable technical scheme, the secondary adsorption zone is provided with an adsorption bed of micron-sized porous activated carbon and CaO, and heavy metals including arsenic, selenium and lead are further adsorbed by utilizing the CaO and the activated carbon.
As the preferable technical scheme, after the WESP removal efficiency is obviously reduced, operations such as replacing the adsorption bed and updating the spray liquid are needed.
The flue gas enters a primary adsorption zone from a flue gas inlet, wherein an adsorption bed of micron-sized porous sodium carbonate and sodium bicarbonate is arranged in the primary adsorption zone and is used for adsorbing granular heavy metal arsenic, selenium and lead (As p、Sep、Pbp), and active oxides (such As sodium thiosulfate and the like) generated by the reaction of SO 2 in the flue gas and the sodium bicarbonate are utilized to convert As 3+ into As 5+, se 0 into Se 4+ and Pb 0 into Pb 2+; the flue gas enters a first-stage spraying area after first-stage adsorption, the spraying liquid is sodium hypochlorite solution, the flue gas is fully contacted with the spraying liquid in the spraying area, and heavy metals such as arsenic, selenium, lead and the like are further oxidized by utilizing sodium hypochlorite; the flue gas enters a demisting area after primary spraying, wherein a demister is used for treating fine dust particles, fog particles and wet gas saturated by liquid steam; the flue gas enters a secondary spraying area after passing through a mist removing area, the spraying liquid is a solution prepared from sodium carbonate and sodium bicarbonate powder, the flue gas is fully contacted with the spraying liquid in the spraying area, and heavy metals such As granular (As p、Sep、Pbp), simple substance (Se 0,Pb0) and compound (As 3+,As5 +,Se4+,Pb2+) are further removed by utilizing the sodium carbonate and the sodium bicarbonate; the flue gas enters the electrostatic dust collection area after passing through the secondary spraying area, wherein anodes and cathodes provided with barbed needles are staggered and connected with a central shaft, and the electrodes periodically rotate along with the central shaft during working, so that the dust collection effect of the electrostatic dust collection area is improved, and the removal effect of particles formed by arsenic, selenium, lead and the like after spraying and liquid drops can be further improved; the flue gas enters a secondary adsorption zone after passing through an electrostatic dust removal zone, an adsorption bed provided with micron-sized porous activated carbon and CaO is used for further adsorbing various forms of heavy metals such as arsenic, selenium, lead and the like by using the CaO and the activated carbon, and finally the purified flue gas is discharged from a flue gas outlet.
Compared with the prior art, the invention has the beneficial effects that: the method aims at effectively removing pollutant particles and heavy metal arsenic, selenium and lead in the flue gas, and the flue gas sequentially passes through a primary adsorption zone, a primary spraying zone, a mist removing zone, a secondary spraying zone, an electrostatic dust removing zone and a secondary adsorption zone, and a wet electrostatic dust collector with double-stage adsorption and double-stage spraying is adopted to cooperatively treat the heavy metal arsenic, selenium and lead in the flue gas, so that various forms of arsenic, selenium and lead in the flue gas are efficiently removed, the removal rate of heavy metals is improved on the whole, and the ultralow near zero emission of the coal-fired flue gas is realized.
Drawings
FIG. 1 is a schematic diagram of a WESP device for efficiently removing heavy metals in cooperation with two-stage adsorption and two-stage spraying according to the present invention.
In the figure, 1 is a flue gas inlet, 2 is a primary adsorption zone, 3 is a primary spraying zone, 4 is a demister, 5 is a secondary spraying zone, 6 is an anode, 7 is a cathode, 8 is a barbed, 9 is a secondary adsorption zone, 10 is a flue gas outlet, 11 is an ash bucket, 12 is a sewage outlet, and 321 is a sweeping component.
Detailed Description
The invention will now be described in detail with reference to the drawings and specific examples.
Example 1
The WESP device for efficiently removing heavy metals by combining double-stage adsorption and double-stage spraying is provided with a smoke inlet 1 and a smoke outlet 10 as shown in figure 1, wherein a first-stage adsorption zone 2, a double-stage spraying zone, an electrostatic dust collection zone and a second-stage adsorption zone 9 are sequentially arranged between the smoke inlet 1 and the smoke outlet 10 along the smoke flow direction, the double-stage spraying zone and the electrostatic dust collection zone are sequentially arranged from bottom to top, and a pollution discharge zone is arranged below the double-stage adsorption zone; the two-stage spraying area is provided with a first-stage spraying area 3 and a second-stage spraying area 5 which are sequentially arranged from bottom to top, and a mist removing area is arranged between the first-stage spraying area 3 and the second-stage spraying area 5.
Specifically:
In this embodiment, this WESP device includes the barrel, and blowdown district, doublestage spray district and electrostatic precipitator district set gradually in the barrel from the bottom up, and one-level adsorption district 2 and second grade adsorption district 9 set up in the barrel side, and one-level adsorption district 2 links to each other with one-level spray district 3, and second grade adsorption district 9 links to each other with electrostatic precipitator district, and flue gas import 1 is connected on one-level adsorption district 2, and flue gas export 10 is connected on second grade adsorption district 9.
In this embodiment, the primary adsorption zone 2 is provided with an adsorption bed of micron-sized porous sodium carbonate and sodium bicarbonate, and is used for adsorbing particulate heavy metals, and the particulate heavy metals are oxidized by using active oxides generated by the reaction of SO 2 in flue gas and sodium bicarbonate, and include particulate As p、Sep and Pb p.
In this embodiment, the first stage spraying area 3 is used for contacting the flue gas with the sodium hypochlorite solution sprayed by the first stage spraying area 3, and the heavy metals including arsenic, selenium and lead are further oxidized by using sodium hypochlorite. The secondary spraying area 5 is used for enabling the flue gas to be in contact with a solution prepared from sodium carbonate and sodium bicarbonate powder sprayed by the secondary spraying area 5, and granular, simple substance state and compound state heavy metals are further removed by utilizing the sodium carbonate and the sodium bicarbonate, the granular heavy metals comprise granular As p、Sep and Pb p, the simple substance state heavy metals comprise simple substance state Se 0 and Pb 0, and the compound state heavy metals comprise compound state As 3+、As5+、Se4+ and Pb 2+. Preferably, the mass ratio of sodium carbonate to sodium bicarbonate is 1:1-3. More preferably, the primary spray zone 3 and the secondary spray zone 5 have a spray particle size of 10 μm to 200. Mu.m. The demister 4 is arranged in the demisting area, and the demister 4 is used for treating fine dust particles, fog particles and wet gas saturated by liquid steam.
In this embodiment, the electrostatic dust collection area is provided with a central shaft, and anodes 6 and cathodes 7 alternately arranged and connected to the central shaft, the cathodes 7 are provided with barbs 8, and the anodes 6 and the cathodes 7 are driven by the central shaft to periodically rotate along with the central shaft. The dust removing effect of the electrostatic dust removing area is improved, and the particle removing effect of arsenic, selenium, lead and the like formed by spraying and liquid drops can be further improved. Preferably, the electrostatic precipitation zone is further provided with a purging member 321, and the purging member 321 is a high-pressure air injector and is located above the anode 6 and the cathode 7, and is used for purging particles adsorbed on the electrode plates of the electrostatic precipitation zone to fall to the pollution discharge zone.
The sewage disposal area is provided with an ash bucket 11 and a sewage disposal outlet 12. Is used for collecting heavy metal particles such as arsenic, selenium, lead and the like.
In this embodiment, the secondary adsorption zone 9 is provided with an adsorption bed of micron-sized porous activated carbon and CaO, and heavy metals including arsenic, selenium and lead are further adsorbed by using CaO and activated carbon.
When the WESP device works, flue gas firstly enters a first-stage adsorption zone 2 through a flue gas inlet 1, granular arsenic, selenium and lead in the flue gas are adsorbed by porous sodium carbonate and sodium bicarbonate, flue gas SO 2 reacts with the sodium bicarbonate to generate active oxides (such As sodium thiosulfate and the like) SO As to oxidize the arsenic, selenium and lead into As 5+、Se4+ and Pb 2+; then the flue gas enters a first-stage spraying area 3, sprayed sodium hypochlorite liquid drops and part of heavy metal particles are combined to form larger particles and are settled into an ash bucket 11, and part of heavy metal arsenic, selenium and lead are further oxidized; then the flue gas passes through a demister to treat fine dust particles, fog particles and wet gas saturated by liquid steam through a demister; the other part of heavy metal particles in the flue gas upwards enter a secondary spraying area 5 to be fully contacted with spray liquid sodium carbonate and sodium bicarbonate solution, so that various forms of heavy metals such as arsenic, selenium, lead and the like are further removed; then the residual heavy metal particles enter an electrostatic dust removing area, part of the residual heavy metal particles are adsorbed on an electrode plate after corona discharge, the electrode plate in the electrostatic dust removing area periodically rotates along with a central shaft, the heavy metal particles adsorbed on the electrode are blown to an ash bucket 11 through a blowing component 321, and the heavy metal particles deposited at the ash bucket are discharged from a sewage outlet 12; the flue gas enters the secondary adsorption zone 9 after passing through the electrostatic dust removal zone, residual heavy metals in the flue gas are further adsorbed by CaO and activated carbon, and the purified flue gas is finally discharged from the flue gas outlet 10. By taking heavy metal lead as an example, through 5-10 times of tests of a simulated flue gas system, the lead concentration at the inlet of the flue gas is 30 mug/m 3, the overall error of the simulation experiment is +/-5%, the flue gas flow is set to be 1.2L/min, and the average lead content detected in the flue gas after the two-stage adsorption and two-stage spray oxidation of the device is 5.67 mug/m 3.
The previous description of the embodiments is provided to facilitate a person of ordinary skill in the art in order to make and use the present invention. It will be apparent to those skilled in the art that various modifications can be readily made to these embodiments and the generic principles described herein may be applied to other embodiments without the use of the inventive faculty. Therefore, the present invention is not limited to the above-described embodiments, and those skilled in the art, based on the present disclosure, should make improvements and modifications without departing from the scope of the present invention.
Claims (5)
1. The WESP device is characterized by comprising a smoke inlet (1) and a smoke outlet (10), wherein a primary adsorption zone (2), a double-stage spraying zone, an electrostatic dust removal zone and a secondary adsorption zone (9) are sequentially arranged between the smoke inlet (1) and the smoke outlet (10) along the smoke flowing direction, the double-stage spraying zone and the electrostatic dust removal zone are sequentially arranged from bottom to top, and a pollution discharge zone is arranged below the double-stage adsorption zone;
The two-stage spraying area is provided with a first-stage spraying area (3) and a second-stage spraying area (5) which are sequentially arranged from bottom to top, and a mist removing area is arranged between the first-stage spraying area (3) and the second-stage spraying area (5);
The primary adsorption zone (2) is provided with an adsorption bed of micron-sized porous sodium carbonate and sodium bicarbonate, and is used for adsorbing granular heavy metals, the granular heavy metals are oxidized by utilizing an active oxide generated by the reaction of SO 2 in flue gas and the sodium bicarbonate, and the granular heavy metals comprise granular As p、Sep and Pb p;
The first-stage spraying area (3) is used for enabling the flue gas to be in contact with sodium hypochlorite solution sprayed by the first-stage spraying area (3), and heavy metals including arsenic, selenium and lead are further oxidized by using sodium hypochlorite;
The secondary spraying area (5) is used for enabling the flue gas to be in contact with a solution prepared from sodium carbonate and sodium bicarbonate powder sprayed by the secondary spraying area (5), and granular, simple substance state and compound state heavy metals are further removed by utilizing the sodium carbonate and the sodium bicarbonate, the granular heavy metals comprise granular As p、Sep and Pb p, the simple substance state heavy metals comprise simple substance state Se 0 and Pb 0, and the compound state heavy metals comprise compound state As 3+、As5+、Se4+ and Pb 2+;
the mass ratio of the sodium carbonate to the sodium bicarbonate is 1:1-3;
The secondary adsorption zone (9) is provided with an adsorption bed of micron-sized porous activated carbon and CaO, and heavy metals including arsenic, selenium and lead are further adsorbed by utilizing the CaO and the activated carbon.
2. The WESP device for efficiently removing heavy metals in combination with two-stage adsorption and two-stage spraying according to claim 1, characterized in that the spray particle size of the primary spraying zone (3) and the secondary spraying zone (5) is 10 μm to 200 μm.
3. The WESP device for efficiently removing heavy metals by combining double-stage adsorption and double-stage spraying according to claim 1, wherein the demisting area is provided with a demister (4), and the demister (4) is used for treating fine dust particles and fog particles.
4. The WESP device for efficiently removing heavy metals by combining double-stage adsorption and double-stage spraying according to claim 1, wherein the electrostatic dust collection area is provided with a central shaft, and anodes (6) and cathodes (7) which are alternately arranged and connected with the central shaft, wherein the cathodes (7) are provided with barbed needles (8), and the anodes (6) and the cathodes (7) are driven by the central shaft to periodically rotate along with the central shaft.
5. The WESP device for efficiently removing heavy metals in cooperation with two-stage adsorption and two-stage spraying according to claim 4, wherein the electrostatic precipitator zone is further provided with a purging member (321), the purging member (321) is a high-pressure air injector, and is located above the anode (6) and the cathode (7) and is used for purging particles adsorbed on the electrode plates of the electrostatic precipitator zone to fall to the blowdown zone.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910748111.3A CN110449021B (en) | 2019-08-13 | 2019-08-13 | WESP device for efficiently removing heavy metals by combining two-stage adsorption and two-stage spraying |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910748111.3A CN110449021B (en) | 2019-08-13 | 2019-08-13 | WESP device for efficiently removing heavy metals by combining two-stage adsorption and two-stage spraying |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110449021A CN110449021A (en) | 2019-11-15 |
| CN110449021B true CN110449021B (en) | 2024-07-23 |
Family
ID=68486472
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910748111.3A Active CN110449021B (en) | 2019-08-13 | 2019-08-13 | WESP device for efficiently removing heavy metals by combining two-stage adsorption and two-stage spraying |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110449021B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113351370B (en) * | 2021-06-30 | 2023-04-07 | 上海电力大学 | Composite electrostatic dust collection device for removing arsenic, selenium and lead in flue gas |
| CN113856906A (en) * | 2021-10-12 | 2021-12-31 | 国能铜陵发电有限公司 | Flue gas treatment device and flue gas treatment method |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN206996173U (en) * | 2017-07-07 | 2018-02-13 | 环境保护部华南环境科学研究所 | A kind of waste gas multi-pollutant multi- scenarios method synergistic purification device |
| CN109013058A (en) * | 2018-09-27 | 2018-12-18 | 上海电力学院 | A kind of high-efficient wet-type electrostatic precipitator catalysis oxidation joint removing heavy metal device |
| CN109908721A (en) * | 2018-12-21 | 2019-06-21 | 四川大学 | A method for removing heavy metal arsenic in low temperature flue gas by sodium salt method |
| CN211725339U (en) * | 2019-08-13 | 2020-10-23 | 上海电力大学 | WESP device for efficient removal of heavy metals by two-stage adsorption and two-stage spraying |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104923044B (en) * | 2015-06-05 | 2017-06-09 | 中晶环境科技股份有限公司 | Smoke gas treatment system and method based on ozone |
-
2019
- 2019-08-13 CN CN201910748111.3A patent/CN110449021B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN206996173U (en) * | 2017-07-07 | 2018-02-13 | 环境保护部华南环境科学研究所 | A kind of waste gas multi-pollutant multi- scenarios method synergistic purification device |
| CN109013058A (en) * | 2018-09-27 | 2018-12-18 | 上海电力学院 | A kind of high-efficient wet-type electrostatic precipitator catalysis oxidation joint removing heavy metal device |
| CN109908721A (en) * | 2018-12-21 | 2019-06-21 | 四川大学 | A method for removing heavy metal arsenic in low temperature flue gas by sodium salt method |
| CN211725339U (en) * | 2019-08-13 | 2020-10-23 | 上海电力大学 | WESP device for efficient removal of heavy metals by two-stage adsorption and two-stage spraying |
Also Published As
| Publication number | Publication date |
|---|---|
| CN110449021A (en) | 2019-11-15 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN100531865C (en) | Simultaneous purification method of streamer discharge plasma flue gas pollutants | |
| CN109013058B (en) | High-efficient wet electrostatic precipitator catalytic oxidation jointly removes heavy metal device | |
| CN103055649B (en) | Dust removal, desulfurization and denitrification device of coal-fired power generation boiler | |
| CN102430478A (en) | Remove PM in flue gas2.5Apparatus and method of | |
| CN101716451A (en) | Method for removing various pollutants in fume by combining discharge plasmas and absorption | |
| CN101810993B (en) | Method for achieving high effective mercury removal through modifying electrostatic precipitator | |
| CN102716635A (en) | Method and system for simultaneously removing heavy metals and fine particle matters in smoke | |
| CN106964243A (en) | A kind of integrative coordinated removing sulfur trioxide device and its method of work suitable for sulphur coal | |
| CN110449017B (en) | Device for removing heavy metals of arsenic, selenium and lead by improving WESP through alkali liquor injection | |
| CN105169872A (en) | Device and method for flue gas cleaning by combining impact agglomeration wet dust collector with wet electric dust collector | |
| CN102755820A (en) | Synchronous deep purification technology for various pollutants in industrial flue gas | |
| CN110449021B (en) | WESP device for efficiently removing heavy metals by combining two-stage adsorption and two-stage spraying | |
| CN108211780A (en) | A kind of intelligent coordinated control method of coal-fired industry source flue gas multiple pollutant | |
| CN109925850B (en) | Electrochemical synergistic liquid-phase catalytic sulfur and nitrate integrated purification method and device | |
| CN105709597B (en) | A kind of the flue gas ash removal mercury removal device and its processing method of plasma reactor joint membrane bag filter | |
| CN102527177B (en) | Dust collection and mercury removal integrated electric-bag composite dust collector | |
| CN101648112A (en) | Flue gas purifying device and flue gas purifying method for trapping inhalable particulate | |
| CN105396441A (en) | Low-temperature economizer and bipolar high-voltage streamer corona discharge combined smoke cleaning method | |
| CN113304591A (en) | Method and system for purifying flue gas of carbon roasting furnace | |
| CN104069713A (en) | Coagulation-enhanced electricity-bag dust removing process | |
| CN108579300B (en) | Wet-type purification treatment method and system for blast furnace flue gas of steel plant | |
| CN202270577U (en) | Device for removing PM2.5 (particle matter less than 2.5 micrometers in diameter) in smoke | |
| US20220088612A1 (en) | Integrated deep purification device for removing sulfur, nitrate, dust and fluorine | |
| CN211725339U (en) | WESP device for efficient removal of heavy metals by two-stage adsorption and two-stage spraying | |
| CN210845850U (en) | A device for the removal of heavy metals from arsenic, selenium, lead and heavy metals by lye jet boosting WESP |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |