CN210584457U - Flue gas zero emission-approaching wet desulphurization system of electrolytic aluminum production system - Google Patents
Flue gas zero emission-approaching wet desulphurization system of electrolytic aluminum production system Download PDFInfo
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- CN210584457U CN210584457U CN201821705623.9U CN201821705623U CN210584457U CN 210584457 U CN210584457 U CN 210584457U CN 201821705623 U CN201821705623 U CN 201821705623U CN 210584457 U CN210584457 U CN 210584457U
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Abstract
The utility model discloses an electrolytic aluminum production system flue gas becomes zero release wet flue gas desulfurization system, include: a limestone slurry supply system, a flue gas system, an SO2 absorption system and a gypsum dehydration system. Compared with the prior art, the utility model the advantage lie in: the method can effectively reduce pollutants such as hydrogen fluoride, asphalt tar, particulate matters, sulfur dioxide and the like discharged in the electrolytic aluminum production process, has discharge indexes far superior to numerical values specified by environmental protection standards, reduces harm to the atmosphere around a factory and animals and plants, reduces the cost for enterprises to pay for environmental pollution, thoroughly removes the electrolytic aluminum high-pollution caps, contributes to environmental protection, not only improves the social image of the enterprises, but also has important significance to long-term development of the companies, and has very wide application prospect according to the requirements of national environmental protection policies and the green development requirements of the electrolytic aluminum industry.
Description
Technical Field
The utility model relates to an electrolytic aluminum technical field specifically indicates a zero release wet flue gas desulfurization system is trended to electrolytic aluminum production system flue gas.
Background
In the electrolytic aluminum industry, aluminum oxide is used as a solute in the aluminum electrolysis process, and cryolite (Na) is used as a solute3AlF6) The melt is used as solvent, carbon material is used as electrode to electrolyze, liquid metallic aluminium is separated out on cathode, anode gas mainly containing CO2 is generated on anode, and the carbon block contains S element, SO the electrolysis flue gas contains not only fluoride and dust, but also SO2 gas. The purification system comprises a smoke exhaust pipe network, an alumina treatment system, a bag filter system, a main fan and a chimney system, the treated waste gas is discharged through an exhaust funnel with the height of 60m, most of fluoride and dust in the smoke can be recovered, but sulfur dioxide cannot be effectively removed, the actually measured maximum value of SO2 in the smoke can reach 400mg/Nm3, and the requirements of enterprises on the requirements of environmental protection industry standards of the people's republic of China (clean production standard electrolytic aluminum) (HJ/T187-2006) and the limits of 400mg/Nm3 in a pollution discharge permit on the aluminum industry pollutant discharge standards (GB25465-2010) on the requirement of performing 200mg/Nm3 on pollution discharge are met.
SUMMERY OF THE UTILITY MODEL
The utility model aims at solving the problem mentioned in the background art and providing a flue gas zero emission trend wet desulphurization system of an electrolytic aluminum production system.
In order to solve the technical problem, the utility model provides a technical scheme does: a wet desulphurization system for zero emission of flue gas in an electrolytic aluminum production system comprises:
the limestone slurry supply system comprises a limestone powder bin, a limestone slurry tank, a limestone slurry supply pump, a slurry pool, an accident slurry pump and an accident slurry tank, wherein an electric feeder is arranged between the limestone powder bin and the limestone slurry tank and used for adding limestone in the limestone powder bin into the limestone slurry tank;
the flue gas system comprises an electrolytic flue gas purification dust remover, a flue of an induced draft fan and a flue accident spraying device, wherein the electrolytic flue gas purification dust remover is connected with the flue of the induced draft fan in a leading way, and the flue accident spraying device is positioned on the flue of the induced draft fan;
SO2 absorption system, including SO2 absorption tower, oxidation air system, slurry circulation pump, gypsum thick liquid discharge pump, thick liquid circulation pipeline and branch washing water pump, SO2 absorption tower top be equipped with the absorption tower chimney, SO2 absorption tower in be equipped with tube bank formula defroster, thick liquid atomizing spray layer and thick liquid pond, be equipped with the absorption tower agitator in the thick liquid pond, the slurry circulation pump be located the thick liquid circulation pipeline on, the both ends of thick liquid circulation pipeline respectively with thick liquid pond and thick liquid atomizing spray layer be connected, gypsum thick liquid discharge pump pass through gypsum thick liquid discharge pipe with thick liquid pond bottom is connected, the draught fan flue keep away from the tip of electrolysis flue gas purification dust remover with including SO2 absorption tower be connected, branch washing water pump through dividing the washing water pipe with thick liquid atomizing spray layer, tube bank formula defroster be connected, the sub-washing water pump is connected with a process water tank through a process water pipe, and a factory water pipe is arranged on the process water tank;
the gypsum dehydration system is formed by two sets of vacuum belt dehydrators and a gypsum warehouse, the gypsum dehydration system is independently arranged for an SO2 absorption tower and is configured according to twice capacity of an SO2 absorption tower, the end part of the gypsum slurry discharge pipe far away from the SO2 absorption tower is connected with the vacuum belt dehydrators, a wastewater treatment device is connected with dehydration pipes below the vacuum belt dehydrators, and the wastewater treatment device is connected with the factory water inlet pipe through a treatment water pipe;
the flue gas passes through the electrolytic flue gas purification dust remover, the flue of the induced draft fan, the flue accident spraying device and the SO2 absorption tower, and is discharged from the chimney of the absorption tower.
Preferably, the oxidation air system is an oxidation fan, and each SO2 absorption tower is provided with two oxidation fans which are operated one by one.
As a preferable scheme, each SO2 absorption tower is provided with three gypsum slurry discharge pumps, and the absorption tower is provided with two pumps in one transportation.
As a preferred scheme, the sub-flushing water pipe is connected with the slurry atomization spraying layer and the pipe bundle type demister.
Preferably, the bottom of the gypsum warehouse is connected with a truck through a warehouse pipeline.
As a preferable scheme, the slurry circulating pumps and the slurry circulating pipelines are three groups, so that a two-purpose one-standby three-layer slurry spraying system is formed.
As a preferred scheme, the flue accident spraying device is only used when the desulfurization system fails, so that the damage to the tube bundle type demister caused by overhigh flue gas temperature is avoided.
As a preferable scheme, the accident slurry tank is only used when the desulfurization system fails, slurry in the slurry tank is pumped into the accident slurry tank through the accident slurry pump, then the desulfurization system is subjected to fault maintenance, and the slurry in the accident slurry tank is pumped back to the slurry tank through the accident slurry pump after the maintenance is finished.
Compared with the prior art, the utility model the advantage lie in: the method can effectively reduce pollutants such as hydrogen fluoride, asphalt tar, particulate matters, sulfur dioxide and the like discharged in the electrolytic aluminum production process, has discharge indexes far superior to numerical values specified by environmental protection standards, reduces harm to the atmosphere around a factory and animals and plants, reduces the cost for enterprises to pay for environmental pollution, thoroughly removes the electrolytic aluminum high-pollution caps, contributes to environmental protection, not only improves the social image of the enterprises, but also has important significance to long-term development of the companies, and has very wide application prospect according to the requirements of national environmental protection policies and the green development requirements of the electrolytic aluminum industry.
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
Fig. 2 is a chemical reaction formula in which gaseous SO2, SO3, etc. are dissolved and converted into the corresponding acidic compounds.
As shown in the figure: 1. limestone powder bin, 2 limestone slurry tank, 3 limestone slurry supply pump, 4 electric feeder, 5 slurry tank water supply system, 6 slurry tank stirrer, 7 electrolytic flue gas purification dust remover, 8 induced draft fan flue, 9 flue accident spray device, 10 SO2 absorption tower, 11 oxidation air system, 12 slurry circulating pump, 13 gypsum slurry discharge pump, 14 absorption tower stirrer, 15 tube bundle type demister, 16 slurry circulating pipeline, 17 gypsum slurry discharge pipe, 18 vacuum belt dehydrator, 19 gypsum warehouse, 20 dehydration pipe, 21 waste water treatment device, 22 sub-washing water pump, 23 sub-washing water pipe, 24 process water pipe, 25 process water tank, 26 plant water pipe, 27 process water pipe, 28 absorption tower chimney, 29 warehouse, pipeline, 30 truck, 31 slurry atomization spray layer, 32. a slurry pool 33, an accident slurry pump 34, an accident slurry bin 35 and an accident slurry pipe.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
With reference to the attached drawings, a wet desulphurization system for zero emission of flue gas of an electrolytic aluminum production system comprises:
a limestone slurry supply system, which comprises a limestone powder bin 1, a limestone slurry tank 2, a limestone slurry supply pump 3, a slurry pool 32, an accident slurry pump 33 and an accident slurry tank 34, wherein an electric feeder 4 is arranged between the limestone powder bin 1 and the limestone slurry tank 2, the electric feeder 4 is used for adding limestone in the limestone powder bin 1 into the limestone slurry tank 2, the limestone slurry tank 2 is connected with a slurry tank water supply system 5, the limestone slurry tank 2 is provided with a slurry tank stirrer 6, the accident slurry tank 34 is connected with the slurry pool 32 through an accident slurry pipe 35, and the accident slurry pump 33 is positioned on the accident slurry pipe 35;
the flue gas system comprises an electrolytic flue gas purification dust remover 7, a flue 8 of an induced draft fan and a flue accident spraying device 9, wherein the electrolytic flue gas purification dust remover 7 is connected with the flue 8 of the induced draft fan in a leading way, and the flue accident spraying device 9 is positioned on the flue 8 of the induced draft fan;
SO2 absorption system, including SO2 absorption tower 10, oxidation air system 11, slurry circulation pump 12, gypsum thick liquid discharge pump 13, thick liquid circulation pipeline 16 and branch washing water pump 22, SO2 absorption tower 10 top is equipped with absorption tower chimney 28, SO2 absorption tower 10 in be equipped with tube bundle defroster 15, thick liquid atomizing spray layer 31 and thick liquid pond 32, be equipped with absorption tower agitator 14 in the thick liquid pond 32, slurry circulation pump 12 be located slurry circulation pipeline 16 on, the both ends of thick liquid circulation pipeline 16 respectively with thick liquid pond 32 and thick liquid atomizing spray layer 31 be connected, gypsum thick liquid discharge pump 13 through gypsum thick liquid discharge pipe 17 with thick liquid pond 32 bottom is connected, draught fan flue 8 keep away from the tip of electrolysis gas purification dust remover 7 with including SO2 absorption tower 10 be connected, branch washing water pump 22 through washing water pipe 23 with the atomizing spray layer 31 of thick liquid, The tube bundle type demister 15 is connected, the sub-flushing water pump 22 is connected with a process water tank 25 through a process water pipe 24, and a factory water pipe 26 is arranged on the process water tank 25;
the gypsum dehydration system consists of two sets of vacuum belt dehydrators 18 and a gypsum warehouse 19, the gypsum dehydration system is independently arranged for an SO2 absorption tower 10 and is configured according to twice capacity of the SO2 absorption tower 10, the end part of the gypsum slurry discharge pipe 17 far away from the SO2 absorption tower 10 is connected with the vacuum belt dehydrators 18, a wastewater treatment device 21 is connected with a dehydration pipe 20 below the vacuum belt dehydrators 18, and the wastewater treatment device 21 is connected with the factory water inlet pipe 26 through a treatment water pipe 27;
the flue gas passes through the electrolytic flue gas purification dust remover 7, the flue 8 of the induced draft fan, the flue accident spraying device 9 and the SO2 absorption tower 10, and is discharged from the absorption tower chimney 28.
As a preferable scheme, the oxidation air system 11 is an oxidation fan, and each SO2 absorption tower 10 is provided with two oxidation fans which are operated one by one.
As a preferable scheme, each SO2 absorption tower 10 is equipped with three gypsum slurry discharge pumps 13, one for two.
Preferably, the sub-flushing water pipe 23 is connected with the slurry atomization spraying layer 31 and the tube bundle type demister 15.
Preferably, the bottom of the gypsum warehouse 19 is connected to a truck 30 through a warehouse conduit 29.
Preferably, the slurry circulating pump 12 and the slurry circulating pipeline 16 are three groups, and a two-purpose one-standby three-layer slurry spraying system is formed.
As a preferred scheme, the flue accident spraying device 9 is only used when the desulfurization system fails, so that the damage to the tube bundle type demister 15 due to overhigh flue gas temperature is avoided.
Preferably, the accident slurry tank 34 is only used when the desulfurization system fails, the slurry in the slurry tank 32 is pumped into the accident slurry tank 34 through the accident slurry pump 33, the desulfurization system is subjected to fault maintenance, and the slurry in the accident slurry tank 34 is pumped back to the slurry tank 32 through the accident slurry pump 33 after the maintenance is finished.
Absorption process of SO2 in the desulfurization absorption tower: the absorption reaction process of SO2 in the flue gas in the absorption tower can be divided into three areas, namely an absorption area, an oxidation area and a neutralization area.
1) The reaction process in the absorption zone is:
the flue gas enters from the lower side of the SO2 absorption tower to be in countercurrent contact with the sprayed slurry, and due to sufficient gas/liquid contact in the absorption tower, a mass transfer process occurs on a gas/liquid interface, as shown in figure 2, and gaseous SO2, SO3 and the like in the flue gas are dissolved and converted into corresponding acidic compounds. The process that SO2 in the flue gas is dissolved into the absorption slurry almost completely occurs in the absorption zone, only part of HSO 3-is oxidized into H2SO4 by O2 in the flue gas in the absorption zone, CaCO3 in the slurry can only neutralize part of oxidized H2SO4 and H2SO3 because the contact time of the slurry and the flue gas in the absorption zone is only a few seconds, only little part of CaCO3 in the slurry participates in chemical reaction in the zone, therefore, the pH value of liquid drops is sharply reduced along with the falling, the absorption capacity is weakened along with the sharp reduction of the pH value of the liquid drops, the upper pH value is higher in the absorption zone, the HSO 3-concentration is low, CaSO 3. 1/2H2O is easy to generate, the contacted SO2 concentration is higher and higher along with the falling of the slurry, the pH value of the slurry is reduced faster, and then CaSO 3. 1/2H2O can be converted into Ca (HSO) 2;
2) reaction process in the oxidation zone:
the oxidation zone is from the liquid level of the SO2 absorption tower to a position about 200mm to 300mm below an oxidation air pipeline, and the main reaction in the zone is as follows:
H++HSO3-+1/2O2→2H++SO42-
CaCO3+2H+→Ca2++H2O+CO2
Ca2++SO42-+2H2O→CaSO4·2H2O
excess oxidation air is uniformly sprayed into the lower portion of the oxidation zone to oxidize almost all of the unoxidized HSO 3-formed in the absorption zone into H + and SO42-, the optimum pH value of the oxidation reaction is about 4 to 4.5, and the H2SO4 produced by the oxidation reaction is a strong acid which rapidly neutralizes the remaining CaCO3 in the slurry to form CaSO3 in a dissolved state4With CaSO4Is continuously generated when Ca is present2 +When the concentration of SO 42-reaches a certain supersaturation degree, CaSO is crystallized and separated out4·2H2O, i.e. gypsum, excess CaCO in the slurry as it passes slowly through the oxidation zone in the SO2 absorption tower3The content also gradually decreases, and when the slurry reaches the bottom of the oxidation zone, the CaCO remained in the slurry3The concentration is reduced to the minimum value, and the slurry is taken from the position and sent to a dehydration system, so that a gypsum byproduct with higher quality can be obtained;
3) reaction process of the neutralization zone:
the lower part of the oxidation zone of the SO2 absorption tower is considered as a neutralization zone, the slurry entering the neutralization zone still contains unneutralized H +, fresh limestone slurry is added to the neutralization zone to neutralize the remaining H +, the pH of the slurry and the activity of the slurry are improved, SO that the slurry can reabsorb SO2 in the next circulation process, and the main chemical reactions in the zone are as follows:
CaCO3+2H+→Ca2++H2O+CO2
Ca2++SO42-+2H2O→CaSO4·2H2O。
the present invention and the embodiments thereof have been described above, but the description is not limited thereto, and the embodiment shown in the drawings is only one of the embodiments of the present invention, and the actual structure is not limited thereto. In summary, those skilled in the art should understand that they should not be limited to the embodiments described above, and that they can design the similar structure and embodiments without departing from the spirit of the invention.
Claims (8)
1. The utility model provides an electrolytic aluminum production system flue gas tends zero release wet flue gas desulfurization system which characterized in that includes:
the limestone slurry supply system comprises a limestone powder bin (1), a limestone slurry tank (2), a limestone slurry supply pump (3), a slurry pool (32), an accident slurry pump (33) and an accident slurry tank (34), wherein an electric feeder (4) is arranged between the limestone powder bin (1) and the limestone slurry tank (2), the electric feeder (4) is used for adding limestone in the limestone powder bin (1) into the limestone slurry tank (2), the limestone slurry tank (2) is connected with a slurry tank water supply system (5), the limestone slurry tank (2) is provided with a slurry tank stirrer (6), the accident slurry tank (34) is connected with the slurry pool (32) through an accident slurry pipe (35), and the accident slurry pump (33) is positioned on the accident slurry pipe (35);
the flue gas system comprises an electrolytic flue gas purification dust remover (7), a draught fan flue (8) and a flue accident spraying device (9), wherein the electrolytic flue gas purification dust remover (7) is connected with the draught fan flue (8) in a leading way, and the flue accident spraying device (9) is positioned on the draught fan flue (8);
SO2 absorption system, including SO2 absorption tower (10), oxidation air system (11), slurry circulation pump (12), gypsum thick liquid discharge pump (13), thick liquid circulating line (16) and branch wash water pump (22), SO2 absorption tower (10) top be equipped with absorption tower chimney (28), SO2 absorption tower (10) in be equipped with tube bank formula defroster (15), thick liquid atomizing sprays layer (31) and thick liquid pond (32), is equipped with absorption tower agitator (14) in thick liquid pond (32), slurry circulation pump (12) be located slurry circulating line (16) on, the both ends of slurry circulating line (16) respectively with thick liquid pond (32) and thick liquid atomizing spray layer (31) be connected, gypsum thick liquid discharge pump (13) through gypsum thick liquid discharge pipe (17) with thick liquid pond (32) bottom is connected, draught fan flue (8) keep away from the tip of electrolysis gas cleaning ware (7) with the draught fan flue gas cleaning ware (8) with The system comprises an SO2 absorption tower (10) which is connected, a sub-flushing water pump (22) is connected with a slurry atomization spraying layer (31) and a tube bundle type demister (15) through a sub-flushing water pipe (23), the sub-flushing water pump (22) is connected with a process water tank (25) through a process water pipe (24), and a factory water pipe (26) is arranged on the process water tank (25);
the gypsum dehydration system comprises two sets of vacuum belt dehydrators (18) and a gypsum warehouse (19), the gypsum dehydration system is independently arranged for an SO2 absorption tower (10) and is configured according to the capacity twice of the SO2 absorption tower (10), the end part of a gypsum slurry discharge pipe (17) far away from the SO2 absorption tower (10) is connected with the vacuum belt dehydrators (18), a dehydration pipe (20) below the vacuum belt dehydrators (18) is connected with a wastewater treatment device (21), and the wastewater treatment device (21) is connected with the factory water inlet pipe (26) through a treatment water pipe (27);
the flue gas passes through the electrolytic flue gas purification dust remover (7), the flue of the induced draft fan (8), the flue accident spraying device (9) and the SO2 absorption tower (10), and is discharged from the absorption tower chimney (28).
2. The electrolytic aluminum production system flue gas zero emission trend wet desulphurization system according to claim 1, characterized in that: the oxidation air system (11) is an oxidation fan, and each SO2 absorption tower (10) is provided with two oxidation fans which are operated one by one.
3. The electrolytic aluminum production system flue gas zero emission trend wet desulphurization system according to claim 1, characterized in that: each SO2 absorption tower (10) is provided with three gypsum slurry discharge pumps (13), and the absorption tower is operated at one time and two times.
4. The electrolytic aluminum production system flue gas zero emission trend wet desulphurization system according to claim 1, characterized in that: the sub-washing water pipe (23) is connected with the slurry atomization spraying layer (31) and the tube bundle type demister (15).
5. The electrolytic aluminum production system flue gas zero emission trend wet desulphurization system according to claim 1, characterized in that: the bottom of the gypsum warehouse (19) is connected with a truck (30) through a warehouse pipeline (29).
6. The electrolytic aluminum production system flue gas zero emission trend wet desulphurization system according to claim 1, characterized in that: the slurry circulating pumps (12) and the slurry circulating pipelines (16) are three groups, and a two-purpose one-standby three-layer slurry spraying system is formed.
7. The electrolytic aluminum production system flue gas zero emission trend wet desulphurization system according to claim 1, characterized in that: the flue accident spraying device (9) is only used when the desulfurization system fails, and the tube bundle type demister (15) is prevented from being damaged due to overhigh flue gas temperature.
8. The electrolytic aluminum production system flue gas zero emission trend wet desulphurization system according to claim 1, characterized in that: the accident slurry box (34) is only used when the desulfurization system fails, slurry in the slurry pool (32) is pumped into the accident slurry box (34) through the accident slurry pump (33), the desulfurization system is overhauled, and after overhauling is finished, slurry in the accident slurry box (34) is pumped back into the slurry pool (32) through the accident slurry pump (33).
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109224827A (en) * | 2018-10-22 | 2019-01-18 | 内蒙古锦联铝材有限公司 | A kind of Highway in Electrolytic Aluminium Production System flue gas becomes zero-emission wet desulfurization system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109224827A (en) * | 2018-10-22 | 2019-01-18 | 内蒙古锦联铝材有限公司 | A kind of Highway in Electrolytic Aluminium Production System flue gas becomes zero-emission wet desulfurization system |
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