CN106861415B - Flue gas purification system and method - Google Patents
Flue gas purification system and method Download PDFInfo
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- CN106861415B CN106861415B CN201710261447.8A CN201710261447A CN106861415B CN 106861415 B CN106861415 B CN 106861415B CN 201710261447 A CN201710261447 A CN 201710261447A CN 106861415 B CN106861415 B CN 106861415B
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- dust
- flue gas
- dry deacidification
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- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 85
- 239000003546 flue gas Substances 0.000 title claims abstract description 85
- 238000000746 purification Methods 0.000 title claims abstract description 17
- 238000000034 method Methods 0.000 title claims abstract description 12
- 239000000428 dust Substances 0.000 claims abstract description 116
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 104
- UIIMBOGNXHQVGW-UHFFFAOYSA-M Sodium bicarbonate Chemical compound [Na+].OC([O-])=O UIIMBOGNXHQVGW-UHFFFAOYSA-M 0.000 claims abstract description 70
- 238000005507 spraying Methods 0.000 claims abstract description 57
- 229910000030 sodium bicarbonate Inorganic materials 0.000 claims abstract description 35
- 235000017557 sodium bicarbonate Nutrition 0.000 claims abstract description 35
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 claims abstract description 31
- 239000000920 calcium hydroxide Substances 0.000 claims abstract description 31
- 229910001861 calcium hydroxide Inorganic materials 0.000 claims abstract description 31
- 235000011116 calcium hydroxide Nutrition 0.000 claims abstract description 31
- 239000007789 gas Substances 0.000 claims abstract description 21
- 238000004891 communication Methods 0.000 claims abstract description 3
- 229910052799 carbon Inorganic materials 0.000 claims description 23
- 239000000779 smoke Substances 0.000 claims description 20
- 230000007246 mechanism Effects 0.000 claims description 15
- 238000006243 chemical reaction Methods 0.000 claims description 14
- 238000007599 discharging Methods 0.000 claims description 13
- 238000004064 recycling Methods 0.000 claims description 9
- 238000000227 grinding Methods 0.000 claims description 7
- 238000000926 separation method Methods 0.000 claims description 7
- 239000004744 fabric Substances 0.000 claims description 6
- 238000004140 cleaning Methods 0.000 claims description 4
- 238000005485 electric heating Methods 0.000 claims description 4
- 238000002156 mixing Methods 0.000 claims description 2
- HGUFODBRKLSHSI-UHFFFAOYSA-N 2,3,7,8-tetrachloro-dibenzo-p-dioxin Chemical compound O1C2=CC(Cl)=C(Cl)C=C2OC2=C1C=C(Cl)C(Cl)=C2 HGUFODBRKLSHSI-UHFFFAOYSA-N 0.000 description 7
- 239000002920 hazardous waste Substances 0.000 description 5
- 229910001385 heavy metal Inorganic materials 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 239000002253 acid Substances 0.000 description 3
- 238000003303 reheating Methods 0.000 description 3
- 239000007921 spray Substances 0.000 description 3
- 238000004056 waste incineration Methods 0.000 description 3
- 239000002351 wastewater Substances 0.000 description 3
- 101000606535 Homo sapiens Receptor-type tyrosine-protein phosphatase epsilon Proteins 0.000 description 2
- 102100039665 Receptor-type tyrosine-protein phosphatase epsilon Human genes 0.000 description 2
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 239000003344 environmental pollutant Substances 0.000 description 2
- 231100000719 pollutant Toxicity 0.000 description 2
- 239000004810 polytetrafluoroethylene Substances 0.000 description 2
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 2
- 239000002002 slurry Substances 0.000 description 2
- 239000004698 Polyethylene Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 229910017053 inorganic salt Inorganic materials 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- -1 polyethylene Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000009257 reactivity Effects 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 229910000029 sodium carbonate Inorganic materials 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000005406 washing 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
- B01D53/74—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
- 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
- B01D53/02—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 by adsorption, e.g. preparative gas chromatography
- B01D53/06—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 by adsorption, e.g. preparative gas chromatography with moving adsorbents, e.g. rotating beds
- B01D53/10—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 by adsorption, e.g. preparative gas chromatography with moving adsorbents, e.g. rotating beds with dispersed adsorbents
-
- 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
- B01D53/75—Multi-step processes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/30—Alkali metal compounds
- B01D2251/304—Alkali metal compounds of sodium
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/40—Alkaline earth metal or magnesium compounds
- B01D2251/404—Alkaline earth metal or magnesium compounds of calcium
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/60—Inorganic bases or salts
- B01D2251/604—Hydroxides
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/60—Inorganic bases or salts
- B01D2251/606—Carbonates
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2253/00—Adsorbents used in seperation treatment of gases and vapours
- B01D2253/10—Inorganic adsorbents
- B01D2253/102—Carbon
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/20—Halogens or halogen compounds
- B01D2257/204—Inorganic halogen compounds
- B01D2257/2045—Hydrochloric acid
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/20—Halogens or halogen compounds
- B01D2257/204—Inorganic halogen compounds
- B01D2257/2047—Hydrofluoric acid
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/30—Sulfur compounds
- B01D2257/302—Sulfur oxides
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/70—Organic compounds not provided for in groups B01D2257/00 - B01D2257/602
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Health & Medical Sciences (AREA)
- Biomedical Technology (AREA)
- Dispersion Chemistry (AREA)
- Treating Waste Gases (AREA)
Abstract
The invention discloses a flue gas purification system and a method, wherein the flue gas purification system comprises: a flue gas inlet duct; the first dry deacidification device is characterized in that an air inlet is connected with a flue gas inlet pipeline; the slaked lime spraying device is communicated with the first dry deacidification device; a first activated carbon injector in communication with the first dry deacidification device; the inlet of the first dust removing device is connected with the outlet of the first dry deacidification device through a pipeline; the air inlet of the second dry deacidification device is connected with the air outlet of the first dust removal device through a pipeline; the baking soda spraying device is communicated with the second dry deacidification device; a second activated carbon spraying device which is communicated with the second dry deacidification device; the inlet of the second dust removal device is connected with the outlet of the second dry deacidification device through a pipeline; and the induced draft fan is connected with the gas outlet of the second dust removing device.
Description
Technical Field
The invention belongs to the field of flue gas treatment, and particularly relates to a flue gas purification system, in particular to a flue gas purification system generated after hazardous waste incineration.
Background
The flue gas generated after the incineration treatment of the hazardous waste contains a large amount of complex polluting components (such as HCl, HF, SO) 2 Etc.), dust, heavy metals, dioxin and other pollutants are discharged into the atmosphere after the purification treatment reaches the standard. With the original emphasis of the national environmental protection problem, the emission standard of the flue gas is continuously improved in recent years, and particularly, the recent hazardous waste incineration pollution control standard-GB 1884 new standard is brought out, so that the serious challenge is brought to the standard-reaching emission of the traditional hazardous waste incineration enterprises. This makes the corresponding flue gas cleaning treatment system become increasingly bulky and complex. The method for removing acid gas generally comprises a dry method, a semi-dry method and a wet method, wherein the dry deacidification is to spray dry alkaline substances into flue gas before the flue gas enters a dust remover to react with the acid gas, the method has the advantages of large usage amount of the alkaline substances, high operation cost and certain limitation on deacidification efficiency, and the semi-dry deacidification is to remove Ca (OH) 2 The slurry is sprayed into the reactor to be reacted with the acid gasCa (OH) in this method should be taken into account 2 The preparation system of the slurry is complex, the reactor is easy to accumulate salt, the spray gun is easy to block and abrade; the wet deacidification adopts a washing tower form, so that wastewater containing high-concentration inorganic salt and heavy metal can be generated, and the equipment investment is high; the wet process is adopted to reduce the temperature of the flue gas, so that white smoke plumes are generated, and therefore, a great amount of heat energy is consumed for reheating the flue gas. The dioxin is usually removed by spraying activated carbon, but the traditional mode of passing through a single-stage cloth bag or passing through an activated carbon+cloth bag+activated carbon adsorption tower (the activated carbon is easy to deactivate and self-ignite) is difficult to ensure the standard-reaching emission of the dioxin under the new standard.
Disclosure of Invention
The invention aims to solve the technical problems that the flue gas purification system in the prior art has various defects and is not capable of effectively treating comprehensive flue gas.
Therefore, it is necessary to design an effective and applicable comprehensive flue gas purification system for comprehensively treating main pollutants in the incinerated flue gas. The invention aims to provide a high-efficiency purification system for flue gas generated after incineration treatment of hazardous waste, so that the treated flue gas reaches the latest national emission standard.
The invention provides a flue gas purification system, comprising:
a flue gas inlet duct;
the first dry deacidification device is characterized in that an air inlet is connected with a flue gas inlet pipeline;
the slaked lime spraying device is communicated with the first dry deacidification device;
a first activated carbon injector in communication with the first dry deacidification device;
the inlet of the first dust removing device is connected with the outlet of the first dry deacidification device through a pipeline;
the air inlet of the second dry deacidification device is connected with the air outlet of the first dust removal device through a pipeline;
the baking soda spraying device is communicated with the second dry deacidification device;
a second activated carbon spraying device which is communicated with the second dry deacidification device;
the inlet of the second dust removal device is connected with the outlet of the second dry deacidification device through a pipeline;
and the induced draft fan is connected with the gas outlet of the second dust removing device.
Preferably, the flue gas purification system further comprises a first feed back bin, wherein an inlet of the first feed back bin is connected with a smoke outlet of the first dust removal device through a pipeline, and a gas outlet of the first feed back bin is communicated with the first dry deacidification device through a pipeline; the bottom of the first feed back bin is provided with an ash discharging mechanism.
The flue gas purification system further comprises a second feed back bin, wherein an inlet of the second feed back bin is connected with a smoke outlet of the second dust removal device through a pipeline, and a gas outlet of the second feed back bin is communicated with the second dry deacidification device through a pipeline; the bottom of the second feed returning bin is provided with an ash discharging mechanism.
The slaked lime spraying device is communicated with the flue gas inlet pipeline, and is communicated with the first dry deacidification device through the flue gas inlet pipeline. The first activated carbon spraying device is communicated with the flue gas inlet pipeline, and is communicated with the first dry deacidification device through the flue gas inlet pipeline. The baking soda spraying device is communicated with a pipeline between the first dust removing device and the second dry deacidification device, and is communicated with the second dry deacidification device through the pipeline. The second active carbon spraying device is communicated with a pipeline between the first dust removing device and the second dry deacidification device, so that the second active carbon spraying device is communicated with the second dry deacidification device through the pipeline.
The slaked lime spraying device comprises a slaked lime storage tank and a conveying structure, and the conveying structure is communicated with the slaked lime storage tank and the first dry deacidification device; the first activated carbon spraying device comprises an activated carbon storage tank and a conveying structure, and the conveying structure is communicated with the activated carbon storage tank and the first dry deacidification device; the baking soda spraying device comprises a baking soda bin, a baking soda grinding device and a conveying structure, and the conveying structure is communicated with the baking soda grinding device and the second dry deacidification device; the second activated carbon spraying device comprises an activated carbon storage tank and a conveying structure, and the conveying structure is communicated with the activated carbon storage tank and the second dry deacidification device.
The flue gas purification system further comprises a chimney which is communicated with the outlet of the induced draft fan.
The first dry deacidification device and the second dry deacidification device are dry deacidification reactors or a section of flue; the first dust collector and the second dust collector are bag type dust collectors, dust collector ash hoppers for accumulating dust filtered by cloth bags are arranged at the bottoms of the bag type dust collectors, and the dust collector ash hoppers are provided with electric heating devices and dust collector bypasses and a hot air circulating system.
The invention also provides a method for purifying the flue gas by the flue gas purification system, which comprises the following steps:
1) The flue gas enters a flue gas inlet pipeline, and slaked lime of a slaked lime spraying device and active carbon of a first active carbon spraying device react with the flue gas in a first dry deacidification device;
2) The reacted flue gas enters a first dust removing device, smoke dust is separated in the first dust removing device, and after the separation, the gas enters a first dry deacidification device to react with sodium bicarbonate from a sodium bicarbonate spraying device and activated carbon from a second activated carbon spraying device;
3) And the reacted flue gas enters a second dust removing device, smoke dust is separated in the second dust removing device, and after the separation, the gas is led out by an induced draft fan.
Preferably, in the step 1), the slaked lime of the slaked lime spraying device and the activated carbon of the first activated carbon spraying device are mixed with the flue gas in a flue gas inlet pipeline, and then enter a first dry deacidification device for reaction; and 2) mixing the gas subjected to smoke dust separation in the first dust removing device in the step 2) with sodium bicarbonate from a sodium bicarbonate spraying device and active carbon from a second active carbon spraying device, and then entering a first dry deacidification device for reaction.
In the step 2), the dust is separated in the first dust removing device, the separated dust enters the first return bin, and the bottom of the first return bin is provided with a dust discharging mechanism for discharging the dust to the dust storage bin.
In the step 3), the dust is separated in the second dust removing device, the separated dust enters a second recycling bin, and a dust discharging mechanism is arranged at the bottom of the second recycling bin to discharge the dust to a dust storage bin.
The beneficial effects of the invention are as follows: two-stage dry deacidification (slaked lime and baking soda) and two-stage active carbon are adopted to remove dioxin. The invention has the advantages of high deacidification efficiency (SO) 2 HCl, HF, etc.), no waste water, high flue gas temperature (avoiding low temperature dew point corrosion, no flue gas reheating, avoiding white plume generation), and being capable of removing harmful substances such as dioxin, heavy metals, etc., smoke dust, etc., in the flue gas, and reaching the latest national emission standard.
Drawings
Fig. 1 is a schematic diagram of the flue gas cleaning system according to the present invention.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and specific examples, which are not intended to limit the invention, so that those skilled in the art may better understand the invention and practice it.
As shown in fig. 1, the present invention provides a flue gas cleaning system comprising:
a flue gas inlet pipeline 1.
The first dry deacidification device 4 (the first dry deacidification device 4 may be a specially configured dry deacidification reactor or a section of flue, and the reaction is completed in the flue), and the air inlet of the first dry deacidification device 4 is connected with a flue gas inlet pipeline.
A slaked lime spraying device 2 which is communicated with the first dry deacidification device 4; in the preferred embodiment of the invention, the slaked lime spraying device 2 consists of a slaked lime storage tank and a conveying mechanism, wherein the conveying mechanism is communicated with the slaked lime storage tank and the flue gas inlet pipeline 1 so as to spray the slaked lime in the slaked lime storage tank into the flue gas inlet pipeline 1 to be mixed with flue gas, and then the mixture enters the first dry deacidification device 4 for reaction.
A first activated carbon spraying device 3 which is communicated with the first dry deacidification device 4; in the preferred embodiment of the present invention, the first activated carbon spraying device 3 comprises an activated carbon storage tank and a conveying structure, wherein the activated carbon storage tank is communicated with the flue gas inlet pipeline 1 through the conveying mechanism, so that activated carbon in the activated carbon storage tank is sprayed into the flue gas inlet pipeline 1 to be mixed with flue gas, and then enters the first dry deacidification device 4 for reaction.
The inlet of the first dust removing device 5 is connected with the outlet of the first dry deacidification device through a pipeline; in a preferred embodiment of the present invention, the first dust collector 5 is a bag-type dust collector, a dust collector ash bucket for accumulating the dust filtered by the cloth bag is arranged at the bottom of the bag-type dust collector, an electric heating device is arranged on the dust collector ash bucket, a dust collector bypass and a hot air circulation system are arranged on the dust collector ash bucket, and the bag-type dust collector is made of PTFE needled felt and PTPE film.
The air inlet of the second dry deacidification device 9 (the first dry deacidification device 4 can be a dry deacidification reactor which is specially arranged, or can be a section of flue in which the reaction is completed) is connected with the air outlet of the first dust removal device 5 through a pipeline.
A baking soda spraying device which is communicated with the second dry deacidification device 9; in a preferred embodiment of the invention, the baking soda spraying device comprises a baking soda bin 7, a baking soda grinding device 6 and a conveying structure, wherein the conveying structure is communicated with the baking soda grinding device 6 and the second dry deacidification device 9, and the baking soda is sprayed into a pipeline between the first dust removal device 5 and the second dry deacidification device 9 to be mixed with flue gas after being ground by the grinding machine from the baking soda bin and then enters the second dry deacidification device 9 for reaction.
A second activated carbon spraying device 8 which is communicated with a second dry deacidification device 9; in the preferred embodiment of the present invention, the second activated carbon spraying device 8 comprises an activated carbon storage tank and a conveying structure, wherein the activated carbon storage tank is communicated with a pipeline between the first dust removing device 5 and the second dry deacidification device 9 through the conveying structure so as to mix the activated carbon in the activated carbon storage tank in the pipeline with flue gas, and then enter the second dry deacidification device 9 for reaction.
The inlet of the second dust removing device 10 is connected with the outlet of the second dry deacidification device 9 through a pipeline; in a preferred embodiment of the present invention, the second dust collector 10 is a bag-type dust collector, the bottom of the bag-type dust collector is provided with a dust collector hopper for accumulating dust filtered by a cloth bag, the dust collector hopper is provided with an electric heating device, and a dust collector bypass and a hot air circulation system are arranged, and the bag-type dust collector is made of PTFE needled felt and PTPE (polyethylene) film.
And the induced draft fan 11 is connected with a gas outlet of the second dust removing device 10 and pulls out the flue gas to ensure the negative pressure of the system.
A chimney 16 communicating with the outlet of the induced draft fan 11;
the inlet of the first feed back bin 12 is connected with the smoke outlet of the first dust removing device 5 through a pipeline, and the gas outlet of the first feed back bin 12 is communicated with the first dry deacidification device 4 through a pipeline; the bottom of the first feed back bin 45 is provided with an ash discharging mechanism.
The inlet of the second feed back bin 12 is connected with the smoke outlet of the second dust removal device 10 through a pipeline, and the gas outlet of the second feed back bin 12 is communicated with the second dry deacidification device 10 through a pipeline; the bottom of the second feed back bin 12 is provided with an ash discharging mechanism.
The working flow of the flue gas purification system of the invention is as follows:
the flue gas enters a flue gas inlet pipeline 1, slaked lime and active carbon are sprayed into the flue gas pipeline by a slaked lime spraying device 2 and a first active carbon spraying device 3, and the slaked lime and the active carbon are mixed with the flue gas and then enter a first dry deacidification device 4 for reaction. The reacted flue gas enters the first dust removing device 5, the smoke dust separated in the first dust removing device 5 enters the first return bin 12, an ash discharging mechanism is arranged at the bottom of the first return bin 12, dust is discharged to an ash storage bin 13, and the gas of the first return bin 12 enters the first dry deacidification device 4 for reaction. The gas in the first dust removal device 5 and the ground baking soda (baking soda grinder 6, the baking soda can be ground to a particle size<20 μm (more than 90%) and activated carbon, and then enters a second dry deacidification device 9 for reaction, and the inlet temperature of the second dry deacidification device 9 is equal to or higher than the inlet temperature of the second dry deacidification device>140 o And C, ensuring that sodium bicarbonate is decomposed into sodium carbonate with porous and fluffy structures, and having higher reactivity. The reacted flue gas enters a second dust removing device 10, the smoke dust separated in the second dust removing device 10 enters a second recycling bin 14, a dust discharging mechanism is arranged at the bottom of the second recycling bin 14, the dust is discharged to a dust storage bin 15, and the gas of the second recycling bin 14 enters a second dryThe reaction is carried out in the deacidification device 9. The induced draft fan 11 pulls out the flue gas, guarantees the system negative pressure. The induced draft fan is connected with the chimney 16, and the treated flue gas is discharged after reaching standards.
The beneficial effects of the invention are as follows: two-stage dry deacidification (slaked lime and baking soda) and two-stage active carbon are adopted to remove dioxin. The invention has the advantages of high deacidification efficiency (SO) 2 HCl, HF, etc.), no waste water, high flue gas temperature (avoiding low temperature dew point corrosion, no flue gas reheating, avoiding white plume generation), and being capable of removing harmful substances such as dioxin, heavy metals, etc., smoke dust, etc., in the flue gas, and reaching the latest national emission standard.
The above-described embodiments are merely preferred embodiments for fully explaining the present invention, and the scope of the present invention is not limited thereto. Equivalent substitutions and modifications will occur to those skilled in the art based on the present invention, and are intended to be within the scope of the present invention. The protection scope of the invention is subject to the claims.
Claims (2)
1. A flue gas cleaning system, comprising:
a flue gas inlet duct;
the first dry deacidification device is characterized in that an air inlet is connected with a flue gas inlet pipeline;
the slaked lime spraying device is communicated with the first dry deacidification device;
a first activated carbon injector in communication with the first dry deacidification device;
the inlet of the first dust removing device is connected with the outlet of the first dry deacidification device through a pipeline;
the air inlet of the second dry deacidification device is connected with the air outlet of the first dust removal device through a pipeline;
the baking soda spraying device is communicated with the second dry deacidification device;
a second activated carbon spraying device which is communicated with the second dry deacidification device;
the inlet of the second dust removal device is connected with the outlet of the second dry deacidification device through a pipeline;
the induced draft fan is connected with a gas outlet of the second dust removing device;
the device also comprises a first feed returning bin and a second feed returning bin; the inlet of the first feed returning bin is connected with a smoke outlet of the first dust removing device through a pipeline, a gas outlet of the first feed returning bin is communicated with the first dry deacidifying device through a pipeline, and an ash discharging mechanism is arranged at the bottom of the first feed returning bin; the inlet of the second feed returning bin is connected with a smoke outlet of the second dust removing device through a pipeline, a gas outlet of the second feed returning bin is communicated with the second dry deacidifying device through a pipeline, and an ash discharging mechanism is arranged at the bottom of the second feed returning bin;
the slaked lime spraying device is communicated with the flue gas inlet pipeline, so that the slaked lime spraying device is communicated with the first dry deacidification device through the flue gas inlet pipeline; the first activated carbon spraying device is communicated with the flue gas inlet pipeline, so that the first activated carbon spraying device is communicated with the first dry deacidification device through the flue gas inlet pipeline;
the baking soda spraying device is communicated with a pipeline between the first dust removing device and the second dry deacidification device, so that the baking soda spraying device is communicated with the second dry deacidification device through the pipeline; the second active carbon spraying device is communicated with a pipeline between the first dust removing device and the second dry deacidification device, so that the second active carbon spraying device is communicated with the second dry deacidification device through the pipeline;
the slaked lime spraying device comprises a slaked lime storage tank and a conveying structure, and the conveying structure is communicated with the slaked lime storage tank and the first dry deacidification device; the first activated carbon spraying device comprises an activated carbon storage tank and a conveying structure, and the conveying structure is communicated with the activated carbon storage tank and the first dry deacidification device; the baking soda spraying device comprises a baking soda bin, a baking soda grinding device and a conveying structure, and the conveying structure is communicated with the baking soda grinding device and the second dry deacidification device; the second active carbon spraying device comprises an active carbon storage tank and a conveying structure, and the conveying structure is communicated with the active carbon storage tank and the second dry deacidification device;
the smoke tube is communicated with the outlet of the induced draft fan;
the first dry deacidification device and the second dry deacidification device are dry deacidification reactors or a section of flue; the first dust collector and the second dust collector are bag type dust collectors, dust collector ash hoppers for accumulating dust filtered by cloth bags are arranged at the bottoms of the bag type dust collectors, and the dust collector ash hoppers are provided with electric heating devices and dust collector bypasses and a hot air circulating system.
2. The method for purifying flue gas by a flue gas purification system according to claim 1, comprising the steps of:
1) The flue gas enters a flue gas inlet pipeline, and slaked lime of a slaked lime spraying device and active carbon of a first active carbon spraying device react with the flue gas in a first dry deacidification device;
2) The reacted flue gas enters a first dust removing device, smoke dust is separated in the first dust removing device, and after the separation, the gas enters a first dry deacidification device to react with sodium bicarbonate from a sodium bicarbonate spraying device and activated carbon from a second activated carbon spraying device;
3) The reacted flue gas enters a second dust removing device, smoke dust is separated in the second dust removing device, and after the separation, the gas is led out by an induced draft fan;
in the step 1), the slaked lime of the slaked lime spraying device and the active carbon of the first active carbon spraying device are mixed with the flue gas in a flue gas inlet pipeline, and then enter a first dry deacidification device for reaction; mixing the gas subjected to smoke dust separation in the first dust removing device in the step 2) with sodium bicarbonate from a sodium bicarbonate spraying device and active carbon from a second active carbon spraying device, and then entering a first dry deacidification device for reaction;
in the step 2), smoke dust separation is carried out in the first dust removing device, the separated smoke dust enters a first recycling bin, and a dust discharging mechanism is arranged at the bottom of the first recycling bin and discharges dust to a dust storage bin; in the step 3), the dust is separated in the second dust removing device, the separated dust enters a second recycling bin, and a dust discharging mechanism is arranged at the bottom of the second recycling bin to discharge the dust to a dust storage bin.
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| CN108246008A (en) * | 2018-01-16 | 2018-07-06 | 斐控环境工程（上海）有限公司 | A kind of sodium bicarbonate dry-process deacidification technique |
| CN108392976A (en) * | 2018-05-21 | 2018-08-14 | 宁波市北仑环保固废处置有限公司 | A kind of sodium bicarbonate automation deacidification system and its process |
| CN108837677A (en) * | 2018-06-28 | 2018-11-20 | 中冶长天国际工程有限责任公司 | A kind for the treatment of process and its device of sintering flue gas minimum discharge |
| CN110404404A (en) * | 2019-05-29 | 2019-11-05 | 张家港市艾尔环保工程有限公司 | A kind of high chlorine incineration flue gas synergistic purification technique of high-sulfur |
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| CN110553273A (en) * | 2019-09-26 | 2019-12-10 | 上海博士高环保科技有限公司 | Hazardous waste incineration double-dry-method flue gas treatment system and treatment method |
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Effective date of registration: 20231214 Address after: 344899 West Ecological High tech Industrial Park, Jinxi County Industrial Park, Fuzhou City, Jiangxi Province Patentee after: Jiangxi Xinke Environmental Protection High tech Co.,Ltd. Address before: 100095 High Energy Environment Building, 9 Dijin Road, Haidian District, Beijing Patentee before: Beijing GeoEnviron Engineering & Technology, Inc. |