CN213388158U - Regeneration system of sulfur-containing waste alkali liquor - Google Patents
Regeneration system of sulfur-containing waste alkali liquor Download PDFInfo
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- CN213388158U CN213388158U CN202022294352.6U CN202022294352U CN213388158U CN 213388158 U CN213388158 U CN 213388158U CN 202022294352 U CN202022294352 U CN 202022294352U CN 213388158 U CN213388158 U CN 213388158U
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Abstract
A regeneration system of sulfur-containing waste alkali liquor comprises an acidification tank and an acidification kettle, wherein a waste acid inlet, an oxidant inlet, a flocculant inlet, a waste alkali liquor inlet, an acidification waste alkali liquor outlet and a waste gas outlet are arranged on the acidification kettle; and a waste gas outlet of the acidification kettle is connected with a middle storage tank through a pipeline, and the middle storage tank is connected with a spray tower through a pipeline. The advantages are that: the system has simple structure and strong operability, can effectively regenerate the sulfur-containing waste alkali liquor, has good regeneration effect, reduces the emission of harmful gas, and is safe and environment-friendly.
Description
Technical Field
The utility model relates to a regeneration system of sulphur waste lye that contains.
Background
In the process of producing oil refining such as ethylene, diesel oil, gasoline and the like by a cracking method, the raw material gas, the cracking gas and the finished product steam are usually washed by alkali liquor (sodium hydroxide solution), so that acid gas impurities such as carbon dioxide, hydrogen sulfide and the like in the raw material gas are removed, the raw material gas, the finished product oil gas and the like are ensured to meet the quality requirements, and the device is ensured to run safely and stably. In the process of cracking gas alkali washing, the effective alkali concentration in the alkali liquor is continuously reduced due to continuous reaction consumption of caustic soda and acid gases such as carbon dioxide, hydrogen sulfide and the like and dilution of water washing water, so that in order to ensure the washing effect, fresh sodium hydroxide alkali liquor needs to be continuously supplemented into the alkali washing tower, and meanwhile, part of alkali washing liquor needs to be continuously discharged from the alkali washing tower, namely waste alkali liquor. The composition of the waste alkali liquor pollutants is relatively complex, and the main components are sodium hydroxide, sodium carbonate, sodium sulfide and mercaptan.
The waste lye is a dangerous waste, and mainly has the following reasons: firstly, the corrosion is strong; secondly, the toxicity is high, which is mainly because the sodium sulfide in the waste alkali liquor can react with acid quickly to release hydrogen sulfide which is a highly toxic gas, and when the waste alkali liquor is exposed in the air, the foul smell of the hydrogen sulfide and mercaptan can be released. From the composition of the waste lye, the danger of the waste lye is eliminated, and the method mainly relates to the treatment of sulfide, the treatment of mercaptan, the treatment of residual alkali and the like.
At present, the treatment method of sulfur-containing waste alkali liquor is a regeneration process of MEROX waste alkali desulfurization alkali, which is characterized in that mercaptan is extracted by using alkali liquor and converted into sodium mercaptide, the sodium mercaptide is catalytically oxidized into disulfide, polysulfide is recovered by three-phase separation, the sodium sulfide is oxidized into sodium thiosulfate and sodium sulfite, tail gas is incinerated and discharged, and residual sodium hydroxide and sodium carbonate are concentrated and then recycled. The method needs incineration treatment, and the tail gas generated by combustion contains a large amount of SO2、H2S and other harmful gases are easy to cause secondary pollution.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a regeneration system of sulfur-containing waste alkali liquor, which has the advantages of simple system structure, strong operability, capability of effectively regenerating the sulfur-containing waste alkali liquor, good regeneration effect, reduction in the emission of harmful gas, safety and environmental protection.
The utility model discloses a realize like this:
a regeneration system of sulfur-containing waste lye comprises an acidification tank and an acidification kettle, and is characterized in that: the system comprises an acidification kettle, a waste acid inlet, an oxidant inlet, a flocculant inlet, a waste alkali liquor inlet, an acidification waste alkali liquor outlet and a waste gas outlet, wherein the acidification kettle is provided with the waste acid inlet, the oxidant inlet, the flocculant inlet, the waste alkali liquor inlet, the acidification waste alkali liquor outlet and the waste gas outlet; and a waste gas outlet of the acidification kettle is connected with a middle storage tank through a pipeline, and the middle storage tank is connected with a spray tower through a pipeline.
Furthermore, a settling and concentrating tank is arranged on a pipeline between the filter press and the centrifugal pump I.
Further, a top gas discharge port of the spray tower is connected with a 15m exhaust funnel.
The utility model has the advantages that:
the system has simple structure and strong operability. Polysulfide in the sulfur-containing waste alkali liquor can be removed, the COD value of the sulfur-containing waste alkali liquor is reduced, the regeneration of the sulfur-containing waste alkali liquor is realized, the regeneration effect is good, the alkalinity and the chromaticity of the regenerated alkali liquor meet the regeneration and utilization requirements, and the purposes of treating waste with waste and realizing clean production are achieved; in the regeneration process, the generated waste gas containing hydrogen sulfide is buffered by the middle storage tank, and is discharged to the atmosphere after absorbing hydrogen sulfide gas by the spray tower, so that the discharge of harmful gas is reduced, and the method is safe and environment-friendly.
Drawings
Fig. 1 is a schematic structural diagram of the present invention;
in the figure: 1-an acidification tank, 2-an acidification kettle, 201-a waste acid inlet, 202-an oxidant inlet, 203-a flocculant inlet, 204-a waste alkali liquid inlet, 205-an acidification waste alkali liquid outlet, 206-a waste gas outlet, 3-a settling concentration tank, 4-a centrifugal pump I, 5-a filter press, 6-a centrifugal pump II, 7-a decoloration kettle, 8-a finished product storage tank, 9-a middle storage tank, 10-a spray tower and 11-15m of an exhaust funnel.
Detailed Description
Examples
As shown in the figure, the regeneration system of the sulfur-containing waste alkali liquor comprises an acidification tank 1 and an acidification kettle 2, wherein the acidification kettle 2 is provided with a waste acid inlet 201, an oxidant inlet 202, a flocculant inlet 203, a waste alkali liquor inlet 204, an acidification waste alkali liquor outlet 205 and a waste gas outlet 206, the acidification tank 1 is communicated with the waste acid inlet 201 of the acidification kettle 2 through a pipeline, the acidification waste alkali liquor outlet of the acidification kettle 2 is sequentially connected with a sedimentation concentration tank 3, a centrifugal pump I4 and a filter press 5 through pipelines, the liquid outlet of the filter press 5 is connected with a decolorization kettle 7 through a pipeline, a centrifugal pump II 6 is arranged on the pipeline between the filter press 5 and the decolorization kettle 7, and the bottom of the decolorization kettle 7 is connected with a finished product storage; the waste gas outlet 206 of the acidification kettle 2 is connected with a middle storage tank 9 through a pipeline, the middle storage tank 9 is connected with a spray tower 10 through a pipeline, and a top gas discharge port of the spray tower 10 is connected with a 15m exhaust funnel 11.
When the device works, waste alkali liquor is fed into an acidification kettle 2 through a waste alkali liquor inlet 204, waste concentrated sulfuric acid in an acidification tank 1 is fed into the acidification kettle 2 through a waste acid inlet 201, the pH value of the waste alkali liquor is adjusted to 12, an oxidant sodium persulfate is added into the acidification kettle 2 through an oxidant inlet 202, and then a flocculant cation polyacrylamide solution is added through a flocculant inlet 203 to generate acidification and oxidation reactions; waste gas containing hydrogen sulfide is generated in the reaction process and enters the middle storage tank 9 through the waste gas outlet 206, the waste gas containing the hydrogen sulfide in the middle storage tank 9 enters the spray tower 10 from the bottom of the spray tower 10, NaOH solution with the concentration of 30% wt is pumped in through a circulating pump for spraying, the hydrogen sulfide gas in the waste gas containing the hydrogen sulfide is absorbed by the NaOH solution, and the residual waste gas after absorption is discharged to the atmosphere through an exhaust funnel 11 with the diameter of 15 m; after the waste alkali liquor is completely flocculated in the acidification kettle 2 through acidification and oxidation reactions, the waste alkali liquor is discharged from an acidification waste alkali liquor outlet 205 of the acidification kettle 2, enters a sedimentation concentration tank 3, is precipitated in the sedimentation concentration tank 3, the precipitated slurry at the bottom of the sedimentation concentration tank 3 is sent to a filter press 5 for filter pressing treatment, the filtrate in the filter press 5 is sent to a decoloring kettle 7, flake alkali is added into the decoloring kettle 7 to adjust the concentration of the alkali liquor, then a decoloring agent is added to perform secondary decoloring, and the qualified alkali liquor is sent to a finished product storage tank 8.
While the embodiments of the invention have been described above, it is not intended to be limited to the details shown, or described, but rather to cover all modifications, which would come within the scope of the appended claims, and all changes which come within the meaning and range of equivalency of the art are therefore intended to be embraced therein.
Claims (3)
1. The utility model provides a regeneration system of sulphur waste lye, has acidizing jar and acidizing cauldron which characterized in that: the system comprises an acidification kettle, a waste acid inlet, an oxidant inlet, a flocculant inlet, a waste alkali liquor inlet, an acidification waste alkali liquor outlet and a waste gas outlet, wherein the acidification kettle is provided with the waste acid inlet, the oxidant inlet, the flocculant inlet, the waste alkali liquor inlet, the acidification waste alkali liquor outlet and the waste gas outlet; and a waste gas outlet of the acidification kettle is connected with a middle storage tank through a pipeline, and the middle storage tank is connected with a spray tower through a pipeline.
2. The system for regenerating sulfur-containing waste lye as claimed in claim 1, wherein: and a settling and concentrating tank is arranged on a pipeline between the filter press and the centrifugal pump I.
3. The system for regenerating sulfur-containing waste lye as claimed in claim 1, wherein: and a 15m exhaust funnel is arranged at a gas discharge port at the top of the spray tower.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022294352.6U CN213388158U (en) | 2020-10-15 | 2020-10-15 | Regeneration system of sulfur-containing waste alkali liquor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022294352.6U CN213388158U (en) | 2020-10-15 | 2020-10-15 | Regeneration system of sulfur-containing waste alkali liquor |
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| Publication Number | Publication Date |
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| CN213388158U true CN213388158U (en) | 2021-06-08 |
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| CN202022294352.6U Active CN213388158U (en) | 2020-10-15 | 2020-10-15 | Regeneration system of sulfur-containing waste alkali liquor |
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| CN (1) | CN213388158U (en) |
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2020
- 2020-10-15 CN CN202022294352.6U patent/CN213388158U/en active Active
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