CN111434372A - Method and device for treating flue gas generated by roasting of prebaked anode - Google Patents
Method and device for treating flue gas generated by roasting of prebaked anode Download PDFInfo
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- CN111434372A CN111434372A CN201910033889.6A CN201910033889A CN111434372A CN 111434372 A CN111434372 A CN 111434372A CN 201910033889 A CN201910033889 A CN 201910033889A CN 111434372 A CN111434372 A CN 111434372A
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- flue gas
- desulfurization
- defluorination
- roasting
- sodium hydroxide
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- 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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/02—Particle separators, e.g. dust precipitators, having hollow filters made of flexible material
- B01D46/023—Pockets filters, i.e. multiple bag filters mounted on a common frame
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- 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
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- 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
- B01D53/68—Halogens or halogen compounds
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- Chemical Kinetics & Catalysis (AREA)
- Environmental & Geological Engineering (AREA)
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- Oil, Petroleum & Natural Gas (AREA)
- Treating Waste Gases (AREA)
Abstract
The invention discloses a method and a device for treating prebaked anode roasting flue gas, wherein flue gas from a roasting furnace enters a desulfurization and defluorination device from a main pipeline, an atomization device is arranged outside the end part of the main pipeline, sodium hydroxide solution is sprayed out from a nozzle of the atomization device, the sodium hydroxide solution and the roasting flue gas react in the desulfurization and defluorination device, the nozzle is tangent to the circular cross section of the main pipeline, the flue gas subjected to desulfurization and defluorination enters a bag-type dust collector through a conveying pipeline, the bag-type dust collector removes solid particles in the flue gas, and the flue gas enters a chimney through an induced draft fan after being subjected to desulfurization, defluorination and particle removal, and the invention has the advantages that: the atomized sodium hydroxide solution of the desulfurization and defluorination agent is sprayed into flue gas, and the trend of the flue gas in the desulfurization and defluorination device is changed into spiral shape because the sodium hydroxide solution nozzle is tangent to the trend of the flue, so that the reaction is easier to occur, the reaction efficiency of the sodium hydroxide solution and the acid gas is improved, and no waste liquid is generated in the whole process.
Description
Technical Field
The invention relates to the technical field of flue gas purification, in particular to a method for treating carbon roasting flue gas.
Background
In the electrolytic aluminum industry, roasting is an important process in the production process of carbon products, and the main pollutant in the production process of prebaked anodes is roasting smoke. The flue gas contains harmful substances such as fluoride, dust, sulfur dioxide and the like, and can cause harm to animals and plants, particularly, the acidic gases such as sulfur dioxide and hydrogen fluoride have strong corrosivity, so that the flue gas not only can cause harm to human bodies, but also can cause corrosive influence on production equipment and the like. Therefore, the roasting flue gas of the carbon plant can be discharged only after being desulfurized, defluorinated and dedusted by the flue gas purification system.
At present, the roasting flue gas is collected by an electric tar precipitator to collect tar and most of dust in the flue gas, and then is desulfurized and defluorinated by a desulfurizing and defluorinating device, and finally the dust in the flue gas is removed by a dedusting device.
The traditional process route has long flow and high investment cost, and the temperature of the flue gas needs to be reduced for the trapping efficiency of the electrical tar precipitator, thereby causing energy waste. Meanwhile, in recent years, due to the continuous improvement of a burning control system of the roasting furnace, the amount of tar contained in roasting smoke is very low, and an electric tar precipitator cannot play the main role of the tar, so that the equipment investment is wasted.
Disclosure of Invention
In order to solve the technical problems, the invention aims to provide a method and a device for treating prebaked anode roasting flue gas, and the specific technical scheme is as follows:
a method for treating flue gas from a prebaked anode roasting device comprises the steps that flue gas from a roasting furnace enters a desulfurization and defluorination device from a main pipeline, an atomization device is arranged outside the end part of the main pipeline, a sodium hydroxide solution is sprayed out from a nozzle of the atomization device, and the sodium hydroxide solution and the roasting flue gas react in the desulfurization and defluorination device to carry out desulfurization and defluorination on the roasting flue gas; the spout is tangent with the circular cross-section of trunk line, and the flue gas after the desulfurization defluorination enters into the sack cleaner through pipeline, and the sack cleaner carries out the desorption to the solid particulate matter in the flue gas, and the flue gas discharges in the atmosphere after entering into the chimney through the draught fan after desulfurization defluorination and particulate matter desorption.
The inner wall of the conveying pipeline is provided with heating rods, and the heating rods are arranged on the inner wall of the conveying pipeline in a crossed mode.
The invention further discloses a device for realizing the method, which is provided with a main pipeline, wherein one end of the main pipeline is connected with a flue gas outlet of the roasting furnace, the other end of the main pipeline is connected with the end part of the desulfurization and defluorination device, the end part of the main pipeline is externally provided with an atomization device, a sodium hydroxide solution is sprayed out from a nozzle of the atomization device, and the sodium hydroxide solution and the roasting flue gas react in the desulfurization and defluorination device to perform desulfurization and defluorination on the roasting flue gas; the spout is tangent with the circular cross-section of trunk line, and the below of desulfurization defluorinating device is connected in pipeline's one end, the other end of conveyer pipe is connected on the sack cleaner, and the vent in draught fan is connected to one side of sack cleaner, and the air outlet of draught fan is connected in the chimney.
The number of the nozzles is multiple.
The inner wall of the desulphurization and defluorination device is provided with a spiral groove.
The spiral groove head is arranged corresponding to the nozzle of the atomization device, and the tail is arranged corresponding to the end of the conveying pipeline.
The invention has the advantages that: the atomized sodium hydroxide solution of the desulfurization and defluorination agent is sprayed into flue gas, and the trend of the flue gas in the desulfurization and defluorination device is changed into spiral shape due to the tangent trend of the sodium hydroxide solution nozzle and the flue, so that the flue gas is easy to react, the reaction time is prolonged, the reaction efficiency of the sodium hydroxide solution and the acid gas is improved, and no waste liquid is generated in the whole process.
Drawings
FIG. 1 is a schematic flow chart of the present invention;
fig. 2 is a schematic view of the cross-sectional structure a-a of fig. 1.
Detailed Description
The invention is described in detail below with reference to the accompanying drawings, as shown in fig. 1 and fig. 2, a method for treating flue gas from a prebaked anode roasting furnace, the flue gas from the roasting furnace enters a desulfurization and defluorination device 2 from a main pipeline 1, an atomization device 4 is arranged outside the end part of the main pipeline 1, a sodium hydroxide solution is sprayed out from a nozzle 3 of the atomization device 4, and the sodium hydroxide solution and the roasting flue gas react in the desulfurization and defluorination device 2 to perform desulfurization and defluorination on the roasting flue gas; because spout 3 is tangent with the circular cross-section of trunk line 1, consequently, the flue gas that comes from trunk line 1 is different with the sodium hydroxide wind direction that comes from atomizing device spout 3, produce spiral wind direction in desulfurization defluorinating device 2, and spiral groove along in the desulfurization defluorinating device 2 flows, not only can increase the active area like this, can also prolong reaction time, flue gas after the desulfurization defluorinating passes through conveying pipeline 8 and enters into sack cleaner 5, sack cleaner 5 carries out the desorption to the solid particulate matter in the flue gas, after flue gas enters into chimney 7 through draught fan 6 after desulfurization defluorinating and particulate matter desorption, discharge in the atmosphere.
The inner wall of the conveying pipeline 8 is provided with the heating rods 9, the heating rods 9 are arranged on the inner wall of the conveying pipeline 8 in a crossed mode, and the light and small dust (below 1 micron) moves along with the airflow and is very close to the airflow streamline and can bypass fibers. However, after the filter material is collided by gas molecules which do thermal motion (namely Brownian motion), the original motion direction is changed, the contact chance of dust and fibers is increased, the dust can be captured, and when the diameter of the filter material fibers is thinner, the porosity is smaller, the capture rate is higher, and therefore the filter material is more beneficial to dust removal.
The invention further discloses a device for realizing the method, which is provided with a main pipeline 1, wherein one end of the main pipeline 1 is connected with a flue gas outlet of a roasting furnace, the other end of the main pipeline is connected with the end part of a desulfurization and defluorination device 2, an atomization device 4 is arranged outside the end part of the main pipeline 1, a sodium hydroxide solution is sprayed out from a nozzle 3 of the atomization device 4, and the sodium hydroxide solution and the roasting flue gas react in the desulfurization and defluorination device 2 to perform desulfurization and defluorination on the roasting flue gas; spout 3 is tangent with the circular cross-section of trunk line 1, and the below of desulfurization defluorinating device 2 is connected in pipeline 8's one end, pipeline 8's the other end is connected on sack cleaner 5, and the vent in draught fan 6 is connected to one side of sack cleaner 5, and the air outlet of draught fan 6 is connected in chimney 7.
The number of the spouts 3 is plural.
The inner wall of the desulphurization and defluorination device 2 is provided with a spiral groove.
The spiral groove head is arranged corresponding to the nozzle 3 of the atomization device, and the tail is arranged corresponding to the end of the conveying pipeline 8.
Claims (6)
1. A method for treating flue gas generated by roasting a prebaked anode is characterized by comprising the following steps: flue gas from the roasting furnace enters the desulfurization and defluorination device from the main pipeline, an atomization device is arranged outside the end part of the main pipeline, sodium hydroxide solution is sprayed out from a nozzle of the atomization device, and the sodium hydroxide solution and the roasting flue gas react in the desulfurization and defluorination device to perform desulfurization and defluorination on the roasting flue gas; the spout is tangent with the circular cross-section of trunk line, and the flue gas after the desulfurization defluorination enters into the sack cleaner through pipeline, and the sack cleaner carries out the desorption to the solid particulate matter in the flue gas, and the flue gas discharges in the atmosphere after entering into the chimney through the draught fan after desulfurization defluorination and particulate matter desorption.
2. The method for treating the flue gas generated by roasting the prebaked anode according to claim 1, wherein the method comprises the following steps: the inner wall of the conveying pipeline is provided with heating rods, and the heating rods are arranged on the inner wall of the conveying pipeline in a crossed mode.
3. An apparatus for treating flue gas of prebaked anode for carrying out the method according to claim 1, wherein: the device is provided with a main pipeline, one end of the main pipeline is connected with a flue gas outlet of the roasting furnace, the other end of the main pipeline is connected with the end part of the desulfurization and defluorination device, an atomization device is arranged outside the end part of the main pipeline, a sodium hydroxide solution is sprayed out from a nozzle of the atomization device, and the sodium hydroxide solution and roasting flue gas react in the desulfurization and defluorination device to perform desulfurization and defluorination on the roasting flue gas; the spout is tangent with the circular cross-section of trunk line, and the below of desulfurization defluorinating device is connected in pipeline's one end, the other end of conveyer pipe is connected on the sack cleaner, and the vent in draught fan is connected to one side of sack cleaner, and the air outlet of draught fan is connected in the chimney.
4. The apparatus for treating flue gas of prebaked anode according to claim 3, wherein: the number of the nozzles is multiple.
5. The apparatus for treating flue gas of prebaked anode according to claim 3, wherein: the inner wall of the desulphurization and defluorination device is provided with a spiral groove.
6. The apparatus for treating flue gas of prebaked anode according to claim 5, wherein: the spiral groove head is arranged corresponding to the nozzle of the atomization device, and the tail is arranged corresponding to the end of the conveying pipeline.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910033889.6A CN111434372B (en) | 2019-01-15 | 2019-01-15 | Method and device for treating flue gas generated by roasting of prebaked anode |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910033889.6A CN111434372B (en) | 2019-01-15 | 2019-01-15 | Method and device for treating flue gas generated by roasting of prebaked anode |
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| CN111434372A true CN111434372A (en) | 2020-07-21 |
| CN111434372B CN111434372B (en) | 2022-04-29 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112807999A (en) * | 2021-01-13 | 2021-05-18 | 沈阳铝镁设计研究院有限公司 | Low-temperature denitration system of aluminum oxide roasting furnace |
| NL2028848B1 (en) * | 2021-06-02 | 2022-06-08 | Jining carbon group co ltd | Flue gas treatment method and device thereof |
Citations (8)
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| JPH06190240A (en) * | 1992-12-28 | 1994-07-12 | Mitsubishi Heavy Ind Ltd | Cylindrical type flue gas desulfurizer |
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| CN202460419U (en) * | 2011-12-26 | 2012-10-03 | 安徽安纳达钛业股份有限公司 | Waste gas recovery tower with spraying device |
| KR20150006253A (en) * | 2013-07-08 | 2015-01-16 | 포항공과대학교 산학협력단 | an apparatus for trapping carbon dioxide |
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2019
- 2019-01-15 CN CN201910033889.6A patent/CN111434372B/en active Active
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| JPH06190240A (en) * | 1992-12-28 | 1994-07-12 | Mitsubishi Heavy Ind Ltd | Cylindrical type flue gas desulfurizer |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112807999A (en) * | 2021-01-13 | 2021-05-18 | 沈阳铝镁设计研究院有限公司 | Low-temperature denitration system of aluminum oxide roasting furnace |
| NL2028848B1 (en) * | 2021-06-02 | 2022-06-08 | Jining carbon group co ltd | Flue gas treatment method and device thereof |
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| CN111434372B (en) | 2022-04-29 |
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