CN210261355U - Roasting flue gas wet purification sewage on-site treatment system - Google Patents
Roasting flue gas wet purification sewage on-site treatment system Download PDFInfo
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- CN210261355U CN210261355U CN201920451916.7U CN201920451916U CN210261355U CN 210261355 U CN210261355 U CN 210261355U CN 201920451916 U CN201920451916 U CN 201920451916U CN 210261355 U CN210261355 U CN 210261355U
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Abstract
The utility model discloses a calcination flue gas wet purification sewage field treatment system relates to aluminium electroloysis field, solves and causes secondary pollution, the also high problem of treatment cost easily with sewage through the straight blowdown water treatment station of pipe network. The utility model adopts the technical proposal that: the roasting flue gas wet purification sewage on-site treatment system comprises a slag settling tank positioned at a gravity dust collector waste water outlet and an electric tar precipitator waste water outlet, wherein a neutralization treatment tank is arranged at the downstream of the slag settling tank, a water storage tank is arranged at the downstream of the neutralization treatment tank, and an alkali adding device is also arranged in the neutralization treatment tank. Precipitating wastewater generated by a gravity dust collector and an electric tar precipitator in a sediment tank, and precipitating particulate matters and dust in the wastewater in the sediment tank; then, the mixture enters a neutralization treatment tank for precipitation, alkali liquor is added through an alkali adding device, the pH value is adjusted to be neutral, and then the mixture is discharged into a water storage tank, so that the wet purification treatment of the roasting flue gas can be realized, and the recycling can be realized. The utility model is suitable for a wet purification calcination flue gas field treatment.
Description
Technical Field
The utility model relates to an aluminium electroloysis field specifically is a system that carries out the site treatment to the sewage that wet purification handled calcination flue gas.
Background
In the aluminum electrolysis carbon industry, roasting is an important process in the production process of carbon anodes, and a large amount of harmful gas and dust are generated in the roasting process. The roasting flue gas is mainly asphalt flue gas, has the characteristics of large flue gas quantity, high temperature and high pollutant concentration, and can meet the emission requirement after being collected and trapped by a purification system. In addition, the roasting smoke contains toxic substance hydrogen fluoride which is an acidic substance and needs to be neutralized, and the toxic substance hydrogen fluoride can be discharged after reaching acid-base balance.
In recent years, with the rapid development of the electrolytic aluminum industry, the roasting flue gas is mostly treated by adopting a wet purification technology. Wet purification requires cooling of the roasting flue gas with cooling water and cleaning with an electrical tar precipitator, which all generate a large amount of acidic wastewater. The current treatment mode of the sewage generated by the wet purification of the roasting flue gas is to directly discharge sewage treatment stations from a production site through a pipe network and then perform centralized treatment. Because the sewage is corrosive, the pipeline network and the conveying equipment are easily corroded, the leakage phenomenon occurs, and the environmental pollution is caused. In addition, the cooling water purified by the wet method is disposable, a large amount of water resources are consumed, and in addition, sewage is conveyed in a long distance, so that the treatment cost is high.
SUMMERY OF THE UTILITY MODEL
The utility model provides a calcination flue gas wet purification sewage field treatment system solves and causes secondary pollution, the also high problem of treatment cost easily with sewage through the straight blowdown water treatment station of pipe network.
The utility model provides a technical scheme that its technical problem adopted is: the roasting flue gas wet purification sewage on-site treatment system comprises a slag settling tank positioned at a gravity dust collector waste water outlet and an electric tar precipitator waste water outlet, wherein a neutralization treatment tank is arranged at the downstream of the slag settling tank, a water storage tank is arranged at the downstream of the neutralization treatment tank, and an alkali adding device is also arranged in the neutralization treatment tank.
Further, the method comprises the following steps: the two sludge settling tanks are respectively positioned at the downstream of the wastewater outlet of the gravity dust collector and the downstream of the wastewater outlet of the electric tar precipitator.
Further, the method comprises the following steps: and a slag discharging device is arranged at the position of the slag settling tank.
Further, the method comprises the following steps: and a pH value detection device and a stirring device are also arranged in the neutralization treatment tank.
Specifically, the method comprises the following steps: and a water pump is arranged between the slag settling tank and the neutralization treatment tank, a water inlet pipe of the water pump is positioned at the upper part of the slag settling tank, and a water outlet pipe of the water pump is positioned in the neutralization treatment tank.
The utility model has the advantages that: precipitating wastewater generated by a gravity dust collector and an electric tar precipitator in a sediment tank, and precipitating particulate matters and dust in the wastewater in the sediment tank; then, the mixture enters a neutralization treatment tank for precipitation, alkali liquor is added through an alkali adding device, the pH value is adjusted to be neutral, and then the mixture is discharged into a water storage tank, so that the wet purification treatment of the roasting flue gas can be realized, and the recycling can be realized.
The roasting flue gas wet purification sewage on-site treatment system carries out on-site treatment on sewage generated by wet purification of roasting flue gas, does not need long-distance conveying, avoids corrosion of a pipe network, avoids leakage pollution, realizes recycling of water resources and reduces production cost.
Drawings
FIG. 1 is a schematic view of a sewage treatment system for wet purification of flue gas by roasting.
Parts, positions and numbers in the drawings: a sediment tank 1, a neutralization treatment tank 2, a water storage tank 3 and a purifying device 4.
Detailed Description
The present invention will be further explained with reference to the accompanying drawings.
As shown in figure 1, the utility model discloses calcination flue gas wet purification sewage field treatment system, including the sediment pond 1 that is located gravity dust collector waste water export and electrical tar precipitator waste water export, the low reaches of sediment pond 1 set up neutralization treatment tank 2, and the low reaches of neutralization treatment tank 2 set up tank 3. The purifying equipment 4 is used for purifying the roasting flue gas and comprises a gravity dust collector and an electric tar precipitator, wherein part of particle dust in the roasting flue gas is removed by spray cooling atomized water in the gravity dust collector, the generated wastewater enters the slag settling tank 1, the wastewater after the electric tar precipitator cleans the roasting flue gas enters the slag settling tank 1, the number of the slag settling tank 1 can be one, and the wastewater at two positions can enter the same slag settling tank 1. Or two sediment pools 1 are arranged, and the wastewater generated by the gravity dust collector and the wastewater generated by the electric tar precipitator respectively enter the two sediment pools 1.
The sediment pond 1 is used for settling particulate matters and dust in the waste water, and the downstream side of sediment pond 1 sets up neutralization treatment pond 2. After the wastewater in the slag settling tank 1 is settled, the wastewater can enter the neutralization treatment tank 2 in an overflow mode. Or a water pump is arranged between the slag settling tank 1 and the neutralization treatment tank 2, a water inlet pipe of the water pump is positioned at the upper part of the slag settling tank 1, the supernatant enters the neutralization treatment tank 2, and a water outlet pipe of the water pump is positioned in the neutralization treatment tank 2. The sediment pond 1 can be one-level, and waste water carries out once to deposit promptly and gets into neutralization treatment pond 2 promptly, and sediment pond 1 also can be multistage, and waste water carries out a lot of deposits promptly, for example 2 ~ 3 times deposit and get into neutralization treatment pond 2 again. The residue deposited in the slag settling tank 1 needs to be cleaned regularly, so a slag discharging device is arranged at the position of the slag settling tank 1. The slag discharging device cleans the residue from the slag settling tank 1 and recycles the residue to the material box, and the residue is added with the binder to be made into blocks and then is placed into the roasting furnace to be roasted into carbon raw materials.
The roasting flue gas contains hydrogen fluoride, and the waste water is acidic. The neutralization treatment tank 2 is used for adding alkali liquor, so the neutralization treatment tank 2 is also provided with an alkali adding device. Specifically, the alkali adding device is a sodium hydroxide adding device. And a pH value detection device and a stirring device are also arranged in the neutralization treatment tank 2. And (3) detecting the pH value by using a pH value detection device, calculating the amount of the NaOH solution added by the alkali adding device, adding a proper amount of the NaOH solution, uniformly stirring by using a stirring device, and standing for a period of time. The neutralization treatment tank 2 is used not only for neutralization reaction but also for precipitation. After the wastewater is treated by the neutralization treatment tank 2, the pH value is 7-8, and the wastewater can enter the water storage tank 3 to be recycled as purified cooling water.
In the sewage treatment system for wet purification of the roasting flue gas, the wastewater is firstly precipitated in the slag settling tank 1 for 48 hours, and the precipitated wastewater is layered; secondly, the waste water without ash on the upper layer enters a neutralization treatment tank 2, and the pH value of the waste water is measured; placing the residues in the slag settling tank 1 for 48 hours, then recovering the residues into a material box, adding a binder to prepare blocks, and placing the blocks into a roasting furnace to roast into a carbon raw material; thirdly, adding a proper amount of alkali into the wastewater, uniformly stirring, and standing for 24 hours; and finally, the pH value of the wastewater in the neutralization treatment tank 2 reaches 7-8, and the wastewater enters the water storage tank 3 for recycling.
Claims (3)
1. Calcination flue gas wet purification sewage field treatment system which characterized in that: including sediment pond (1) that is located gravity dust collector waste water export and electric tar precipitator waste water export, the position of sediment pond (1) sets up slag discharging device, and the low reaches of sediment pond (1) set up neutralization treatment pond (2), still sets up pH valve detection device and agitating unit in neutralization treatment pond (2), and the low reaches of neutralization treatment pond (2) set up tank (3), and neutralization treatment pond (2) still set up and add alkali device.
2. The roasting flue gas wet purification sewage field treatment system of claim 1, characterized in that: the two slag settling tanks (1) are respectively positioned at the downstream of the wastewater outlet of the gravity dust collector and the downstream of the wastewater outlet of the electric tar precipitator.
3. The roasting flue gas wet purification sewage field treatment system of claim 1 or 2, characterized in that: a water pump is arranged between the slag settling tank (1) and the neutralization treatment tank (2), a water inlet pipe of the water pump is positioned at the upper part of the slag settling tank (1), and a water outlet pipe of the water pump is positioned in the neutralization treatment tank (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920451916.7U CN210261355U (en) | 2019-04-03 | 2019-04-03 | Roasting flue gas wet purification sewage on-site treatment system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920451916.7U CN210261355U (en) | 2019-04-03 | 2019-04-03 | Roasting flue gas wet purification sewage on-site treatment system |
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| CN210261355U true CN210261355U (en) | 2020-04-07 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114804404A (en) * | 2022-03-22 | 2022-07-29 | 河南中孚炭素有限公司 | Harmless treatment method for roasting wet electric asphalt-containing tar washing water |
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2019
- 2019-04-03 CN CN201920451916.7U patent/CN210261355U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114804404A (en) * | 2022-03-22 | 2022-07-29 | 河南中孚炭素有限公司 | Harmless treatment method for roasting wet electric asphalt-containing tar washing water |
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