CN106621764A - Device for purifying COS in aluminum electrolysis flue gas - Google Patents

Device for purifying COS in aluminum electrolysis flue gas Download PDF

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Publication number
CN106621764A
CN106621764A CN201611055908.8A CN201611055908A CN106621764A CN 106621764 A CN106621764 A CN 106621764A CN 201611055908 A CN201611055908 A CN 201611055908A CN 106621764 A CN106621764 A CN 106621764A
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China
Prior art keywords
reaction chamber
gas
cos
gas reaction
flue
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CN201611055908.8A
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Chinese (zh)
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CN106621764B (en
Inventor
张红亮
李天爽
李劼
冉岭
孙珂娜
肖劲
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Central South University
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Central South University
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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
    • 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
    • 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
    • B01D2257/308—Carbonoxysulfide COS
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2258/00—Sources of waste gases
    • B01D2258/02—Other waste gases
    • B01D2258/0283—Flue gases
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2259/00—Type of treatment
    • B01D2259/80—Employing electric, magnetic, electromagnetic or wave energy, or particle radiation
    • B01D2259/804—UV light

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  • 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 discloses a device for purifying COS in aluminum electrolysis flue gas. The device comprises a gas reaction chamber (1), wherein the gas reaction chamber (1) is provided at least one mixed gas nozzle (7) for spraying mixed gas to the inner cavity of the gas reaction chamber (1); the inlet end of the mixed gas nozzle (7) is connected with a flue gas pipeline (3) and a water mist pipeline (4); the gas reaction chamber (1) is connected with a purified flue gas discharging pipeline (5); the bottom of the gas reaction chamber (1) is connected with a wastewater draining pipeline (6); an ultraviolet light source (9) is arranged in the inner cavity of the gas reaction chamber (1). By adopting the device, the COS decomposition rate can be increased, the COS gas in the flue gas is purified effectively, the amount of COS entering the atmospheric air is reduced, and the environment is protected; on the other hand, alkali consumption in a process of removing SO2 by a subsequent wet method can be lowered, the cost is lowered, acid-containing liquid in a groove is collected and can be recycled for preparing acid, and the profit is increased.

Description

COS purifiers in a kind of aluminium electrolytic flue
Technical field
The present invention relates to a kind of smoke eliminator, COS purifiers in more particularly to a kind of aluminium electrolytic flue.
Background technology
In aluminium electrolysis process, because inevitable anode effect causes to contain part COS in flue gas.COS is in air Main sulfur-bearing dusty gas, its in an atmosphere existence time it is long more than other sulfur-containing compounds.In an atmosphere part is oxidized Acid rain is formed into sulfurous acid, sulfuric acid etc., with air motion, the thin troposphere of air inlet destroys ozone to another part COS Layer, is a kind of very big gas pollutant of harm.And the COS entered into air is mainly derived from aluminium electrolytic flue, therefore subtract COS contents in few aluminium electrolytic flue have important meaning to environmental protection.At present, for aluminium electrolytic flue purification more adopt Two-part, i.e. dry cleaning and wet cleaning.Dry cleaning uses powdery aluminum, and aluminium electrolytic flue is after gas skirt collection Mix with the aluminum oxide of blanking point input, the HF gases in alumina adsorption flue gas, after sack cleaner gas solid separation, cigarette Pneumatic transmission enters subtraction purification process.Subtraction purification generally uses alkaline solution, such as Na2CO3Solution, NaOH solution remove SO in flue gas2 Gas.And for COS gases in flue gas, without special purification technique.Although in subtraction purification process, a part of COS gas Body can be decomposed absorption, but major part still enters air.Therefore, it is very to invent COS gases in a kind of special disposal flue gas It is necessary.
The content of the invention
The technical problem to be solved is to provide a kind of COS gases that can be purified and be produced in aluminium electrolysis process, subtracts Less to COS purifiers in the aluminium electrolytic flue of the harm of environment.
In order to solve above-mentioned technical problem, COS purifiers in the aluminium electrolytic flue that the present invention is provided, including gas reaction Room, described gas reaction chamber is provided with the mixed gas nozzle of at least one inner chamber for spraying to described gas reaction chamber, institute The entrance point of the mixed gas nozzle stated is connected with flue and water smoke pipeline, and described gas reaction chamber is connected with smoke-purifying Gas discharge line, the bottom of described gas reaction chamber is connected with waste outflow pipe, in the inner chamber of described gas reaction chamber Inside it is provided with ultraviolet source.
Baffle plate is provided with above the inner chamber of described gas reaction chamber, the centre of described baffle plate is provided with hole, described Purifying smoke discharge line is located at the top of described baffle plate, and described mixed gas nozzle is located at described gas reaction chamber Lower section of the centre position in described baffle plate.
Described ultraviolet source is located at the internal edge of described baffle plate, under the direction of illumination of described ultraviolet source is Side.
The irradiation portion of described ultraviolet source is acidproof and high temperature resistant spherical glass.
The bottom of described gas reaction chamber is pyramidal structure, and bottom is provided with described waste outflow pipe.
The internal material of whole described gas reaction chamber adopts acid corrosion-resistant material, using the good minute surface of surface reflection The smooth sulfuric acid resistant stainless steel material in glass or surface.
Described mixed gas nozzle is 4, and described flue enters described gas by four flue gas arms Reative cell, described water smoke pipeline enters described gas reaction chamber, the flue gas arm described in by four water smoke arms With the mixed gas nozzle described in the water smoke arm described in jointly connection one.
The ejection gas direction of described mixed gas nozzle is tangent with the inwall of described gas reaction chamber, and to water Square spray downwards.
The pipeline being connected with described gas reaction chamber include flue, water smoke pipeline, purifying smoke discharge line, Waste outflow pipe, mixed gas nozzle, baffle plate, ultraviolet source inside all adopt resistant material to avoid flue gas and wherein Containing acid droplet to corrosive pipeline.
Spent acid exit velocity valve and safety-valve are provided with described waste outflow pipe.
Described gas reaction chamber is fixed on the ground using steel structure framework.
Using COS purifiers in the aluminium electrolytic flue of above-mentioned technical proposal, installed in fluoride dry purification process it Afterwards, before sulfide wet cleaning technique.Flue gas is mixed into gas reaction chamber into during gas reaction chamber with water smoke, ultraviolet Convert under the irradiation of light, generate SO2And original SO in flue gas2Reactor bottom can be entered with droplet settling, the bottom of by Portion's spent acid outlet is discharged, and the flue gas after purification is then discharged by top smoke discharge tube road.Water smoke pipeline connects water fog generator, can To produce water smoke, similar to air humidifier.
Waste outflow pipe in gas reaction chamber bottom is provided with spent acid exit velocity valve and safety-valve, flow velocity valve The controllable waste water rate of outflow, and the effect of safety-valve is when being that emergency case occurs, urgent closure waste water effuser road.Water The speed of the penetrating gas reaction chamber of mist can adjust.
Advantage：The present invention can reduce the concentration of COS in flue gas, reduce pollutions of the COS to environment in aluminium electrolytic flue, also may be used Reduce SO in subsequent purification flue gas2Cost.
The present invention introduces gas reaction chamber by containing COS flue gases, after mixing water smoke and air, water content and O in flue gas2 Improve, promote COS decomposition reactions to occur.In addition under conditions of ultraviolet light, COS resolution ratios are increased.
COS decomposition principles are as follows in flue gas：
COS can rapidly occur photooxidation reaction under ultraviolet light, and the primary product of generation is CO2And SO2。SO2Can enter One step is aoxidized, finally with SO4 2-Form dissolves in a liquid, takes out of from the outlet of bottom spent acid.Into next gas reaction chamber Gas will also pass through identical flow process, identical reaction occur, to ensure clean-up effect.
Reaction equation：
SO2+O2+H2O→H2SO4
In sum, the present invention is a kind of COS gases that can be purified and be produced in aluminium electrolysis process, reduces the harm to environment Aluminium electrolytic flue in COS purifiers.
Description of the drawings
Fig. 1 is the overall schematic of the device of invention.
Fig. 2 is inside reactor schematic perspective view.
Fig. 3 is inside reactor schematic diagram.
Fig. 4 is flue and water smoke pipeline spout schematic perspective view.
Fig. 5 is flue and water smoke pipeline spout schematic top plan view.
Fig. 6 is baffle plate schematic diagram.
Fig. 7 is spout angle schematic diagram.
Fig. 8 is spout angle schematic top plan view.
Fig. 9 is ultraviolet source schematic diagram.
Specific embodiment
Below in conjunction with the accompanying drawings the invention will be further described.
As shown in figure 1, COS purifiers in a kind of aluminium electrolytic flue, including gas reaction chamber 1, set on gas reaction chamber 1 There is the mixed gas nozzle 7 of at least one inner chamber for spraying to gas reaction chamber 1, the entrance point of mixed gas nozzle 7 is connected with cigarette Feed channel 3 and water smoke pipeline 4, gas reaction chamber 1 is connected with purifying smoke discharge line 5, and the bottom of gas reaction chamber 1 is connected with Waste outflow pipe 6, is provided with ultraviolet source 9 in the inner chamber of gas reaction chamber 1.Gas reaction chamber 1 is solid using steel structure framework 2 Determine on the ground.
As shown in Figures 2 and 3, baffle plate 8 is provided with above the inner chamber of gas reaction chamber 1, the centre of baffle plate 8 is provided with hole 11 Ensureing the flue gas of purification can pass through, and purifying smoke discharge line 5 is located at the top of baffle plate 8, and mixed gas nozzle 7 is located at gas Lower section of the centre position of reative cell 1 in baffle plate 8.The bottom of gas reaction chamber 1 is pyramidal structure, and bottom is provided with described giving up Water discharge pipe road 6.
As shown in Fig. 2, Fig. 3 and Fig. 6, ultraviolet source 9 is located at the internal edge of baffle plate 8, and the direction of illumination of ultraviolet source 9 is Lower section.The irradiation portion of ultraviolet source 9 is acidproof and high temperature resistant spherical glass.
The internal material of whole gas reaction chamber 1 adopts acid corrosion-resistant material, using the good two-way mirror of surface reflection Or the sulfuric acid resistant stainless steel material that surface is smooth.
As shown in Fig. 2, Fig. 3, Fig. 4 and Fig. 5, mixed gas nozzle 7 is 4, and flue 4 passes through four flue gas arms 11 Into gas reaction chamber 1, water smoke pipeline 3 enters gas reaction chamber 1, a flue gas arm 11 and by four water smoke arms 10 Prop up the one mixed gas nozzle 7 of connection jointly of water smoke arm 10.
As shown in Figure 7 and Figure 8, the ejection gas direction of mixed gas nozzle 7 is tangent with the inwall of gas reaction chamber 1, and And spray to horizontal direction lower section.
Include flue 3, water smoke pipeline 4, purifying smoke discharge line 5, useless in the pipeline being connected with gas reaction chamber 1 Water discharge pipe road 6, mixed gas nozzle 7, baffle plate 8, the inside of ultraviolet source 9 all adopt resistant material with avoid flue gas and its In containing acid droplet to corrosive pipeline.
Spent acid exit velocity valve and safety-valve are provided with waste outflow pipe 6.
Referring to Fig. 1 to Fig. 8, non-purified flue gas is passed through gas reaction chamber 1 by flue 3, and water smoke passes through water smoke pipe Road 4 enters gas reaction chamber 1, and unreacted flue gas shares a mixed gas nozzle 7 with water smoke when into gas reaction chamber 1 And mix, in the case where ultraviolet source 9 irradiates, react.The SO that COS reactions are generated2There is SO with gas Central Plains2Can be dissolved in water from The waste outflow pipe 6 of lower section is discharged recovery, the baffle plate 8 that unreacted and reaction product pass through the top of gas reaction chamber 1 Middle hole 11, discharges gas reaction chamber 1 and enters next purification process eventually through purifying smoke discharge line 5.
Water smoke pipeline 4 sprays into the water smoke flow control of gas reaction chamber 1 by electrolytic aluminium plant series control system control, its water It is relevant with the electrolysis slot number that anode effect occurs in potline that spray painting enters speed.There is anode effect in more electrolytic cell When, water smoke sprays into speed and accordingly improves.
According to the total flow and COS concentration therein of flue, COS purifications dress in multiple stage aluminium electrolytic flue can be installed Parallel connection is put, to ensure to purify COS effects.
Gas reaction chamber 1 is fixed on the ground using steel structure framework 2, between steel structure framework 2 and gas reaction chamber 1 Fixed form can designed, designed, but should ensure that gas reaction chamber 1 is fixedly secured on the ground.One kind is provided here and adopts steel pipe Fixed scheme can be for reference.
The centre position of gas reaction chamber 1 is provided with four mixed gas nozzles 7, so that flue gas and water smoke enter gas reaction chamber 1.The bottom of gas reaction chamber 1 is pyramidal structure, is easy to drop to fall, and bottom is provided with waste outflow pipe 6, it is ensured that waste water can flow out Gas reaction chamber 1.Baffle plate 8 is provided with the top of gas reaction chamber 1, can to a certain extent be isolated upper space and bottom reaction is empty Between, it is ensured that gas has the sufficient reaction time into after gas reaction chamber 1.The purifying smoke that gas after reaction passes through top Discharge line 5 is discharged, and in the internal edge of the hole 11 of baffle plate 8 four ultraviolet sources 9 are provided with.Entirely gas reaction chamber 1 is interior Portion's material adopts acid corrosion-resistant material, the sulfuric acid resistant stainless steel that the good two-way mirror of surface reflection or surface can be adopted smooth Material.
Flue 3 enters gas reaction chamber 1 by four flue gas arms 10, and water smoke pipeline 4 passes through four water smoke arms 11 enter gas reaction chamber 1, and flue gas arm 10 and water smoke arm 11 connect a mixed gas nozzle 7 jointly.
Baffle plate 8 is fixed with the top of gas reaction chamber 1, the middle hole 11 of baffle plate 8 ensures that the flue gas of purification can pass through, Four ultraviolet sources 9 are installed in the inner side tapping of baffle plate 8, direction of illumination is lower section.
The ejection of mixed gas nozzle 7 gas direction is tangent with the inwall of gas reaction chamber 1, and sprays to horizontal direction lower section Go out.Ensure that gas can increase the gas reaction time in gas reaction chamber 1 with the motion of downward spiral direction.
The ultraviolet source 9 installed on baffle plate 8 is as shown in figure 9, the bottom of ultraviolet source 9 is acidproof and high temperature (300 DEG C) ball Surface glass.
During installation, overall steel structure framework 2 is welded on ground first.Subsequently by flue 3 and aluminium electroloysis cigarette Flue docking after gas cleaning system dry cleaning.Can be according to the total flow flow of whole flue 3, and COS concentration Several gas reaction chambers 1 in parallel, to ensure clean-up effect.
Water fog generator is connected with water smoke pipeline 4, purifying smoke discharge line 5 and the aluminium electrolytic flue wet method of top The flue of purification is connected, and after the waste outflow pipe 6 of lower section can adopt special waste water collection tank to collect, periodically sends into Chemical plant utilizes.
The present invention will contain COS flue gases and mix with water smoke and be passed through gas reaction chamber 1, COS under ultraviolet light with H2O and O2 Reaction generates SO2, and the SO for generating2Generation H soluble in water2SO3, finally it is oxidized to H2SO4, gas is entered by drops of water fall down anti- The spent acid feeder of the bottom of room 1 is answered, eventually through waste outflow pipe 6 preparation that gas reaction chamber 1 is used further to sulfuric acid is discharged.Should The one side of invention can improve COS resolution ratios, COS gases in effective purifying smoke, reduce the amount into COS in air, protection Environment, on the other hand, it is also possible to reduce and remove SO in subsequent wet2During quantity of alkali consumption, reduce cost, in feeder containing acid Liquid is also recyclable for relieving haperacidity, additional income.

Claims (10)

1. COS purifiers in a kind of aluminium electrolytic flue, is characterized in that：Including gas reaction chamber (1), described gas reaction chamber (1) the mixed gas nozzle (7) of at least one inner chamber for spraying to described gas reaction chamber (1), described gaseous mixture are provided with The entrance point of body nozzle (7) is connected with flue (3) and water smoke pipeline (4), and described gas reaction chamber (1) is connected with purification Smoke discharge tube road (5), the bottom of described gas reaction chamber (1) is connected with waste outflow pipe (6), anti-in described gas Ultraviolet source (9) is provided with the inner chamber for answering room (1).
2. COS purifiers in aluminium electrolytic flue according to claim 1, is characterized in that：In described gas reaction chamber (1) inner chamber top is provided with baffle plate (8), and the centre of described baffle plate (8) is provided with hole (11), described purifying smoke discharge pipe Road (5) is located at the top of described baffle plate (8), and described mixed gas nozzle (7) is located in described gas reaction chamber (1) Between position in described baffle plate (8) lower section.
3. COS purifiers in aluminium electrolytic flue according to claim 2, is characterized in that：Described ultraviolet source (9) sets In the internal edge of described baffle plate (8), the direction of illumination of described ultraviolet source (9) is lower section.
4. COS purifiers in aluminium electrolytic flue according to claim 2, is characterized in that：Described ultraviolet source (9) Irradiation portion is acidproof and high temperature resistant spherical glass.
5. COS purifiers in aluminium electrolytic flue according to claim 1 and 2, is characterized in that：Described gas reaction chamber (1) bottom is pyramidal structure, and bottom is provided with described waste outflow pipe (6).
6. COS purifiers in aluminium electrolytic flue according to claim 1 and 2, is characterized in that：Whole described gas is anti- The internal material of room (1) is answered using acid corrosion-resistant material, using smooth resistance to of the good two-way mirror of surface reflection or surface Sulfuric acid stainless steel material.
7. COS purifiers in aluminium electrolytic flue according to claim 1 and 2, is characterized in that：Described mixed gas spray Mouth (7) is 4, described flue (3) by four flue gas arms (10) into described gas reaction chamber (1), it is described Water smoke pipeline (4) by four water smoke arms (11) into described gas reaction chamber (1), the flue gas arm described in (10) the mixed gas nozzle (7) jointly described in connection one of the water smoke arm (11) and described in.
8. COS purifiers in aluminium electrolytic flue according to claim 1 and 2, is characterized in that：Described mixed gas spray The ejection gas direction of mouth (7) is tangent with the inwall of described gas reaction chamber (1), and sprays to horizontal direction lower section.
9. COS purifiers in aluminium electrolytic flue according to claim 2, is characterized in that：With described gas reaction The connected pipeline in room (1) includes flue (3), water smoke pipeline (4), purifying smoke discharge line (5), waste outflow pipe (6), mixed gas nozzle (7), baffle plate (8), all adopt resistant material inside ultraviolet source (9) to avoid flue gas and wherein Containing acid droplet to corrosive pipeline.
10. COS purifiers in aluminium electrolytic flue according to claim 1 and 2, is characterized in that：Arrange in described waste water Go out pipeline (6) and be provided with spent acid exit velocity valve and safety-valve.
CN201611055908.8A 2016-11-25 2016-11-25 COS purification device in a kind of aluminium electrolytic flue Expired - Fee Related CN106621764B (en)

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CN106621764B CN106621764B (en) 2019-05-24

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114892217A (en) * 2022-04-12 2022-08-12 中南大学 System for high-temperature flue gas pre-thermal oxidation aluminum raw material of double-layer closed aluminum electrolysis cell

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104190221A (en) * 2014-09-11 2014-12-10 美景（北京）环保科技有限公司 Desulphurization method, device and system for acid gas containing H2S, COS, CS2 and other gases

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104190221A (en) * 2014-09-11 2014-12-10 美景（北京）环保科技有限公司 Desulphurization method, device and system for acid gas containing H2S, COS, CS2 and other gases

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114892217A (en) * 2022-04-12 2022-08-12 中南大学 System for high-temperature flue gas pre-thermal oxidation aluminum raw material of double-layer closed aluminum electrolysis cell
CN114892217B (en) * 2022-04-12 2024-03-12 中南大学 System for preheating alumina raw material by high-temperature flue gas of double-layer airtight aluminum electrolysis cell

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