CN104803525B - Method for processing high salinity wastewater and device thereof - Google Patents
Method for processing high salinity wastewater and device thereof Download PDFInfo
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- CN104803525B CN104803525B CN201410779388.XA CN201410779388A CN104803525B CN 104803525 B CN104803525 B CN 104803525B CN 201410779388 A CN201410779388 A CN 201410779388A CN 104803525 B CN104803525 B CN 104803525B
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Abstract
The invention provides a method for processing high salinity wastewater from a desulfuration washing system of a catalytic cracking unit at an oil refinery and a device thereof. According to the method, high salinity wastewater generated from a desulfuration washing system of a catalytic cracking unit at an oil refinery is selected as a raw material; catalytic cracking catalyst powder in wastewater is removed by the use of a filter press; sewage enters an oxidization pot to undergo aeration treatment; and finally, inorganic salt in wastewater is removed by cooling crystallization. In comparison with a conventional evaporation method, the method and the device for processing high salinity wastewater from a desulfuration washing system of a catalytic unit have characteristics of low energy consumption and good processing effect.
Description
Technical field
The present invention relates to desulphurization system field of waste water treatment, be especially for processing refinery catalytic cracking unit's desulphurization system
The method and apparatus of high-salt wastewater.
Technical background
The admixture of gas that FCC regenerators produces contains the solid particles such as catalyst fines, and as oxysulfide
Etc sour gas.It is thus desirable to the solid particle reduced in this kind of gas and the content of sour gas, the most just can be discharged into
In air, to reduce this pollutant to ecological destruction.It is known that consolidating in waste gas can be removed by wet scrubbing
Body granule and oxysulfide.Corresponding after washing, wet scrubbing system will give off containing catalyst cracking particles
Thing, Na2SO3, Na2SO4Waste water, this sentence NaOH as washing reagent as a example by.
Accordingly, having the discharge of wastewater requirement of sewage treatment plant by oneself to reach directly to discharge or drain into oil plant, it is right to need
This type of waste water that desulphurization system produces carries out respective handling, mainly COD COD, total solid float TSS, and contains
Salt amount emission request.Wherein, reduce salinity in waste water is the step that wherein difficulty is maximum.The most conventional evaporative crystallization method
Although the requirement of salinity in waste water can be reduced, but there is energy consumption and cross the shortcomings such as height.
Sodium sulfate solubility with temperature changes clearly, and when 30 DEG C, every 100ml aqueous solution sodium sulfate dissolubility is 40.8g；
When-5 DEG C, every 100ml aqueous solution sodium sulfate dissolubility is 0.1g.Therefore freezing method can be used to implement sodium sulfate and reclaim,
Separate later sewage salinity the lowest.
Summary of the invention
It is an object of the invention to provide a kind of high-salt wastewater being exclusively used in the desulphurization system generation of process refinery catalytic cracking unit
Method and apparatus.The waste water that the method and device process is from for refinery catalytic cracking unit's desulfurization washing system, and passes through
Filter pressing, aerating oxidation, freezing and crystallizing method processes this waste water so that it is meet discharge of wastewater index, and it is secondary to finally give inorganic salt
Product.Concrete grammar is as follows:
Sewage after desulfurization is delivered to pressure filter filter pressing through sewage pump, then through oxidation tank aeration, the clear solution of generation is main
Composition is aqueous sodium persulfate solution, and solution concentration is 7.5-8%.Aqueous sodium persulfate solution by stock solution delivery pump be delivered to primary cooler,
Secondary coolers, three grades of coolers.Wherein one-level cooler cooling medium is recirculated water, and consumption is 50t/h；Secondary coolers is cold
But medium is the clear liquid after centrifuge processes and the supernatant of settling tank, and its temperature is about 0 DEG C, sodium sulphate content
Less than 1%；Three grades of coolers are to utilize cooling-water machine to cool down, and stock solution temperature are controlled at-5 DEG C, then enter back into settling tank, enter
The salt water mixed liquid of settling tank, by gravitational settling, the sodium sulfate of crystallization sinks to bottom and flows to centrifuge, after machine processes by centrifugation,
Sal glauberi crystal generates and transports outward, and the aqueous solution after being centrifuged flows into clean solution tank.
Further, the present invention provides a kind of device for described method, including filter-pressing device, aerating oxidation device, cooling
Device and retracting device, wherein filter-pressing device includes plate and frame type filter-press, reaches catalyst solid insoluble by the way of extruding
Thing and the separation of waste liquid；Aerating oxidation device includes oxidation tank, blasts air by roots blower bottom oxidation tank, reaches to expose
Gas reduces the effect of COD value；Chiller includes at least three cooler, is followed successively by primary cooler, secondary coolers and three
Level cooler, in primary, two grades, the heat exchange action of logical supercooled water in three grades of coolers, reaches the effect of cooling waste water,
And make inorganic salt therein crystallize out；Retracting device includes settling tank, centrifuge, limpid pond, for by the saline after cooling
Separate and recover after mixed liquor sedimentation.
Catalytic unit desulphurization system high-salt wastewater is processed, with conventional evaporation by method and apparatus described in the present invention
Compare, there is energy consumption low, the feature of high treating effect.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of apparatus of the present invention.
Detailed description of the invention
Technique in the present invention is applicable to process being catalyzed containing catalytic cracking of refinery catalytic cracking unit's desulfurization washing system discharge
Agent powder and high concentration inorganic salt (generally Na2SO3And Na2SO4) waste water.
For further illustrating the present invention, illustrate with the following Examples:
Embodiment 1:
As it is shown in figure 1, a kind of device for processing the high-salt wastewater from refinery catalytic cracking unit's desulfurization washing system,
Including filter-pressing device, aerating oxidation device, chiller and retracting device, wherein filter-pressing device includes plate and frame type filter-press, logical
Cross the mode of extruding to reach the separation of catalyst solid insoluble matter and waste liquid；Aerating oxidation device includes oxidation tank, passes through Roots
Blower fan blasts air bottom oxidation tank, reaches aeration and reduces the effect of COD value；Chiller includes at least three cooler,
It is followed successively by primary cooler, secondary coolers and three grades of coolers, at primary, two grades, logical supercooled water in three grades of coolers
Heat exchange action, reaches the effect of cooling waste water, and makes inorganic salt therein crystallize out；Retracting device include settling tank, from
Scheming, limpid pond, for separating and recovering after the salt water mixed liquid sedimentation after cooling.
Embodiment 2:
Use the method that said apparatus processes the high-salt wastewater from refinery catalytic cracking unit's desulfurization washing system, including step:
(1) waste water from desulphurization system initially enters plate and frame type filter-press.Before entering pressure filter, in waste liquid, solid is insoluble
Thing content is about 0.5wt% under normal circumstances, is about 3.5wt% (as catalytic unit runs agent) in extreme circumstances.By pressure
The catalytic cracking catalyst powder of the overwhelming majority in waste liquid can be removed by the filtration of filter.Clear liquid total suspended solid after filtration
TSS content can be down to below 100mg/L.
(2) entrance oxidation tank is carried out aeration by the clear liquid after filtering.The overwhelming majority in aeration process, in solution
Na2SO3Translate into Na2SO4.After aeration, solution C OD value can be down to below 50mg/L.
(3) after aeration, waste liquid be mainly composed of aqueous sodium persulfate solution, it is delivered to primary cold by stock solution delivery pump
But device, secondary coolers and three grades of coolers.Wherein primary cooler cooling medium is recirculated water, and consumption is 50t/h；Two grades cold
But device cooling medium is the clear liquid after centrifuge processes and the supernatant of settling tank, and its temperature is about 0 DEG C, sulphuric acid
Sodium content is less than 1%；Three grades of coolers are to utilize cooling-water machine to cool down, and control stock solution temperature at-5 DEG C.
(4) after supercooling with Na2SO4·10H2The solution of O crystal enters back into settling tank (crystallizer), and it is heavy to enter
The salt water mixed liquid of fall tank, by gravitational settling, crystallization sodium sulfate sink to bottom and flow to centrifuge, after machine processes by centrifugation,
Sal glauberi crystal generates and transports outward, and the aqueous solution after being centrifuged flows into clean solution tank.
Process catalytic unit desulphurization system waste liquid by technique described in the present invention, compared with conventional evaporation, have
Energy consumption is low, the feature of high treating effect.
Claims (2)
1. the method being used for processing high-salt wastewater, it is characterised in that: the high-salt wastewater that described method processes splits from oil plant catalysis
Gasifying device desulfurization washing system, described method passes through filter pressing, aerating oxidation, and freezing and crystallizing method processes this waste water, and final
To inorganic salt side-product, concretely comprise the following steps:
High-salt wastewater after desulfurization is delivered to pressure filter filter pressing through sewage pump, then through oxidation tank aeration, the clear solution of generation is main
Composition is aqueous sodium persulfate solution, and solution concentration is 7.5-8%；Aqueous sodium persulfate solution by stock solution delivery pump be delivered to primary cooler,
Secondary coolers, three grades of coolers；Wherein primary cooler cooling medium is recirculated water, and consumption is 50t/h；Secondary coolers is cold
But medium is the clear liquid after centrifuge processes and the supernatant of settling tank, and its temperature is about 0 DEG C, sodium sulphate content
Less than 1%；Three grades of coolers are to utilize cooling-water machine to cool down, and stock solution temperature are controlled at-5 DEG C, then enter back into settling tank, enter
The salt water mixed liquid of settling tank, by gravitational settling, the sodium sulfate of crystallization sinks to bottom and flows to centrifuge, after machine processes by centrifugation,
Sal glauberi crystal generates and transports outward, and the aqueous solution after being centrifuged flows into clean solution tank.
2. for the device of method described in claim 1, it is characterised in that: include filter-pressing device, aerating oxidation device, chiller
And retracting device, wherein filter-pressing device includes plate and frame type filter-press, by extruding by the way of reach catalyst solid insoluble matter and
The separation of waste liquid；Aerating oxidation device includes oxidation tank, blasts air by roots blower bottom oxidation tank, reaches aeration fall
The effect of low cod value；Chiller includes at least three cooler, is followed successively by primary cooler, secondary coolers and three grades cold
But device, in primary, two grades, the heat exchange action of logical supercooled water in three grades of coolers, reaches the effect of cooling waste water, and makes
Inorganic salt therein crystallizes out；Retracting device includes settling tank, centrifuge, clean solution tank, for by the saline mixing after cooling
Separate and recover after liquid sedimentation.
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| CN201410779388.XA CN104803525B (en) | 2014-12-10 | 2014-12-10 | Method for processing high salinity wastewater and device thereof |
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| CN201410779388.XA CN104803525B (en) | 2014-12-10 | 2014-12-10 | Method for processing high salinity wastewater and device thereof |
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| CN104803525A CN104803525A (en) | 2015-07-29 |
| CN104803525B true CN104803525B (en) | 2017-01-11 |
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| CN109607654A (en) * | 2019-01-31 | 2019-04-12 | 内蒙古科技大学 | Device, method and the application of strong brine low temperature crystallization desalination |
| CN109665547A (en) * | 2019-02-28 | 2019-04-23 | 仲恺农业工程学院 | A kind of method that sodium sulfate crystal is precipitated in induction high-salt wastewater |
| CN110330165A (en) * | 2019-06-05 | 2019-10-15 | 中国石油天然气集团有限公司 | Strong brine zero-emission and sub-prime crystallizing treatment process and processing system |
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| CN103754896A (en) * | 2013-12-21 | 2014-04-30 | 中盐安徽红四方股份有限公司 | Method for extracting mirabilite from sodium hydrosulfite wastewater |
| CN103771459A (en) * | 2014-01-16 | 2014-05-07 | 北京化工大学 | Method of recovering sodium sulfate from lead-bearing desulfurized waste liquid |
| CN103961995A (en) * | 2014-05-22 | 2014-08-06 | 天津理工大学 | Method for producing high-purity sodium sulfite and sodium sulfate by desulfurizing coal-fired flue gas through alkaline method |
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2014
- 2014-12-10 CN CN201410779388.XA patent/CN104803525B/en not_active Expired - Fee Related
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| RU2064891C1 (en) * | 1994-08-08 | 1996-08-10 | Акционерное общество открытого типа "Братский алюминиевый завод" | Method of sodium sulfate isolation from scrubbing solution of electrolytical aluminium production |
| CN101234827A (en) * | 2008-02-26 | 2008-08-06 | 南京工业大学 | Treatment and resource reclaiming method for chromium-containing wastewater containing high concentration sodium sulfate |
| CN102249265A (en) * | 2010-11-19 | 2011-11-23 | 华尔润玻璃产业股份有限公司 | Method for recycling semi-dry process desulphurization byproduct sodium sulfate |
| CN102092880A (en) * | 2010-12-01 | 2011-06-15 | 新疆天业（集团）有限公司 | Process for freezing and denitriding primary brine with membrane method in polyvinyl chloride production |
| CN102225816A (en) * | 2011-04-18 | 2011-10-26 | 北京百奥纳高科技有限公司 | Method for recovering secondary salts from desulfurization liquid and recycling desulfurization liquid |
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| CN103771459A (en) * | 2014-01-16 | 2014-05-07 | 北京化工大学 | Method of recovering sodium sulfate from lead-bearing desulfurized waste liquid |
| CN103961995A (en) * | 2014-05-22 | 2014-08-06 | 天津理工大学 | Method for producing high-purity sodium sulfite and sodium sulfate by desulfurizing coal-fired flue gas through alkaline method |
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