CN103865571B - The slurry oil filtering system of catalytic cracking unit - Google Patents
The slurry oil filtering system of catalytic cracking unit Download PDFInfo
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- CN103865571B CN103865571B CN201210530805.8A CN201210530805A CN103865571B CN 103865571 B CN103865571 B CN 103865571B CN 201210530805 A CN201210530805 A CN 201210530805A CN 103865571 B CN103865571 B CN 103865571B
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Abstract
The invention discloses a kind of slurry oil filtering system of catalytic cracking unit, comprising: prefilter, be wherein provided with pre-filtering filter core, and prefilter is provided with directly exports with slurry oil the pipeline be connected; At least two fine filters, wherein each fine filter is all connected with prefilter, and in fine filter, being provided with smart filter core, the precision of smart filter core is greater than the precision of pre-filtering filter core, and all fine filters are also provided with directly export with slurry oil the pipeline be connected; Controlling System, two stages of its point control filtering system, comprising: unloading phase and working stage.After slurry oil filtering system of the present invention successfully solves the import to China of foreign slurry oil filtering system, because of more and easily blocked containing gum asphalt in the slurry oil that China uses, and and even the life-span very of short duration problem being forced to discard.
Description
Technical field
The invention relates to a kind of catalytic cracking unit externally extracting oil filtration art, especially filter the filtering system containing the more slurry oil of colloid.
Background technology
The externally extracting oil of catalytic cracking unit be refinery catalytic cracking unit in process of production, cannot the tailing of cracking be discharged by the form of getting rid of outward.Because catalytic cracking unit adopts vulcanization bed reaction, therefore inevitably contain curing catalysts powder in externally extracting oil, solids content is 3000 ~ 20000ppm.Therefore the mode by filtering is needed, by solid particulate filters out.And in order to increase work efficiency, also need to adopt the filtering system of continuous filtration to carry out work.
Usually, due to when carrying out slurry oil and filtering, cake layer can be formed before the filter core of strainer.Cake layer can assist filter core to filter, and therefore generally only needs to utilize single filter just can reach gratifying filter effect, and without the need to adopting two-stage filtration.Common filtering system is that two grade one filters are set up in parallel, and when impact is filtered when the filter cake thickness of a strainer is blocked up, carries out back flushing, and utilizes another strainer to filter, thus achieve the non-stop run of filtering system to this strainer.
But because the catalytic cracking unit of the current refinery of China is from different abroad, be all the heavy oil catalytically cracking equipment that ginseng slag ratio is very high, the asphalt content of the externally extracting oil of such catalytic cracking unit is very high.These bituminous matters belong to colloid.If bituminous matter touches the filter core of strainer, filtering material business will be sticked to, and enter into material for core inside, produce distortion, cause filter core to block, cannot back flushing regeneration.In reality, filtering system work-ing life of foreign import is well below its rated life time.
For this reason, in Chinese patent 201010577004.8, disclose a kind of mode adopting two-stage filtration, but two set filters are wherein only exchange to use, and alternately filter the difference that there is no in essence with utilizing two set filters in the filtering system of foreign import.Because if be only that two set filters are used alternatingly, the problem how preventing smart filter core blocked can not be solved.Because rich rhagiocrin slurry oil can enter into smart filter core in the same old way, the space of blocking fine filter cartridge.The present inventor thinks, it is nonsensical for designing two-stage filtration in Chinese patent 201010577004.8, and the contriver of this case seems not consider to know why will do two-stage filtration.
Summary of the invention
In order to effectively solve the filtration problem of the high slurry oil of colloidal pitch matter content, main purpose of the present invention is to provide a kind of filtering system that can really can prevent filter core from being blocked by colloid.
Secondary objective of the present invention is providing a kind of filtering system that automatically can control also continuous firing.
Secondary objective of the present invention, is providing one not block smart filter core, and can carries out abundant back flushing, and greatly extend the filtering system in the work-ing life of filtering system.
For reaching above-mentioned purpose, the invention provides a kind of slurry oil filtering system of catalytic cracking unit, comprising: at least one prefilter, being wherein provided with pre-filtering filter core, and described prefilter is provided with directly exports with slurry oil the pipeline be connected; At least two fine filters, wherein each fine filter is all connected with described prefilter, and be provided with smart filter core in described fine filter, the precision of described smart filter core is greater than the precision of described pre-filtering filter core, and all described fine filters are also provided with directly export with slurry oil the pipeline be connected; Controlling System, it controlled all fine filters before not forming cake layer, and its smart filter core does not all contact with original slurry oil to be filtered, and only contacts with the slurry oil that have passed the prefilter forming cake layer.The object designing prefilter and fine filter two-stage filtration in the present invention can not be infected with the rhagiocrin slurry oil of richness in order to ensure fine filter.In the prior art, only have grade one filter, this strainer runs into rich rhagiocrin slurry oil, and slurry oil will be made to enter into the filter core of strainer.And because only have single filter, so the filter core of this strainer can not be too loose, and need tightr.Rich rhagiocrin slurry oil enters into this filter core more closely, just closely attached to it, even if by back flushing, can not remove, damage the filter core of grade one filter thus soon.And in the inventive solutions, before fine filter, being provided with prefilter, the precision of prefilter is less, and the gap namely in pre-filtering filter core is larger.Original slurry oil to be filtered, through prefilter, prefilter forms cake layer.Due in original slurry oil containing a large amount of colloidal pitch matter, nature can penetrate in pre-filtering filter core, but due to the gap in pre-filtering filter core comparatively large, therefore when back flushing, be easy to rinse out.After prefilter forms cake layer, then slurry oil is allowed to enter into fine filter by prefilter.At this moment because colloid is more easily attached on cake layer, the colloid therefore by remaining in the slurry oil of prefilter is few.These slurry oils enter into fine filter again, just not easily in smart filter core, form colloid consolidation thing.And along with fine filter progressively also being formed cake layer, then more can not form colloid consolidation thing in smart filter core.Therefore, after the cake layer of fine filter is formed, just original slurry oil to be filtered directly can be passed through fine filter.Determine the number of strainer according to the size of system, if systematic comparison is large, then prefilter also can more than one.
Preferably, Controlling System also can divide two stages to control filtering system, comprising: unloading phase, first on the pre-filtering filter core of prefilter, filter cake is generated in this stage, then this prefilter is communicated with a fine filter, while carrying out filtering, this fine filter forms filter cake, on all the other fine filters, form filter cake successively more afterwards; Working stage, when the filter cake thickness of this stage prefilter is blocked up, carries out back flushing to prefilter, and now each fine filter all directly and slurry oil outlet; And when prefilter needs to generate cake layer, prefilter is communicated with a fine filter.Unloading phase time make each fine filter all generate the process of filter cake, and working stage is exactly carry out back flushing to the fine filter reaching finish-time, again the fine filter after back flushing is connected with the prefilter with filter cake, allows the filter cake on prefilter help fine filter to block the process of colloid.Filter cake thickness on fine filter can not be blocked up, and blocked up pressure reduction is too large, affects working efficiency.Therefore be provided with finish-time for the filter cake on fine filter is blocked up, arrive finish-time, just must carry out back flushing to fine filter.In fact, also can be determine whether carrying out back flushing by detecting filter cake thickness, or determine whether carrying out back flushing by the pressure reduction detecting fine filter both sides.Filter cake thickness on prefilter can not be blocked up, and blocked up pressure reduction is too large, affects working efficiency.Therefore also blocked up for the filter cake on prefilter can be set finish-time, arrive finish-time, just must carry out back flushing to prefilter.In fact, also can be determine whether carrying out back flushing by the filter cake thickness detected on prefilter, or determine whether carrying out back flushing by the pressure reduction detecting prefilter both sides.
Preferably, in the slurry oil filtering system of described catalytic cracking unit, the pre-filtering filter core of described prefilter is wedge wire winded filtering core; The smart filter core of described fine filter is porous metal filter core.Wedge wire winded filtering core gap is each other comparatively large, is also convenient to back flushing.The filter cake slag that back flushing obtains all is discharged in filter cake tank.Filter cake slag is exactly the solid matter in slurry oil.Liquid substance in slurry oil is by filter core, and solid matter is not by filter core, is gathered in the side of filter core thus, just defines filter cake.Back flushing is oppositely pressurizeed with liquid exactly and to be rinsed filter core, to make filter cake split away off from filter core, reuses filter core well.
Preferably, in the slurry oil filtering system of described catalytic cracking unit, unloading phase only process described filtering system and make a reservation for two in pending whole flow slurry oils/first-class gauging slurry.Such as pending slurry oil flow is 20mT/Hr, then unloading phase, the only slurry oil of process about 10mT/Hr.
Preferably, in the slurry oil filtering system of described catalytic cracking unit, at least one prefilter described is one, and described at least two fine filters are two, be respectively the first fine filter and the second fine filter, and control process unloading phase of described is as follows:
First in prefilter, pass into the slurry oil of 1/2nd flows, these slurry oils flow through prefilter and directly enter into deslagging tank, and on prefilter, shape generates cake layer gradually thus; After the cake layer on prefilter reaches filtering requirement, prefilter is communicated with the first fine filter, filtration treatment is carried out to the slurry oil of 1/2nd flows, along with the carrying out of filtering, filter cake on first fine filter constantly thickens, when thickening to filtering requirement, slurry oil outlet is directly communicated with the first fine filter; Again prefilter is communicated with the second fine filter.
Preferably, in the slurry oil filtering system of described catalytic cracking unit, the control process unloading phase of described also comprises:
After slurry oil outlet is directly communicated with the first fine filter, back flushing is carried out to prefilter, back flushing filter cake slag is out drained in deslagging tank, then the prefilter eliminating cake layer is communicated with the first fine filter again, and cut off described first fine filter and be communicated with the direct of slurry oil, after filtration for some time, can form cake layer on prefilter again, this is communicated with the second fine filter by prefilter again.If the cake layer on prefilter does not reach blocked up, then without the need to first carrying out back flushing, also without the need to being communicated with the first fine filter again, to form the cake layer of applicable thickness, and only need directly to be communicated with the second fine filter.And if cake layer on prefilter reach blocked up, then first must carry out back flushing, and then be communicated with the first fine filter, to form the cake layer of applicable thickness, and then be communicated with the second fine filter.Whether prefilter can be blocked up, relevant with design variable.If prefilter small volume, just easily reach blocked up.
Preferably, in the slurry oil filtering system of described catalytic cracking unit, the control process of described working stage also comprises:
Predetermined pending whole flow slurry oils are passed into filtering system of the present invention, wherein prefilter and the second fine filter serial communication, and the first fine filter and slurry oil are directly communicated with, slurry oil is filtered by prefilter and the second fine filter branch road and the first fine filter branch road.
Preferably, in the slurry oil filtering system of described catalytic cracking unit, flowrate control valve on prefilter and the second fine filter branch road is placed through 1/2nd of predetermined pending whole flows, and the flowrate control valve on the first fine filter branch road is not controlled.Such as, pending slurry oil flow is 20mT/Hr, but may fluctuate in the flow range of 18 ~ 23mT/Hr.Then a branch road being controlled at 10mT/Hr, and control is not added to another branch road, controlling than being easier to carry out entirety like this.
Preferably, in the slurry oil filtering system of described catalytic cracking unit, second fine filter after on the second fine filter, filter cake thickness reaches filtering requirement, is directly communicated with slurry oil after being filtered by prefilter and the second fine filter branch road by slurry oil.
Preferably, in the slurry oil filtering system of described catalytic cracking unit, after the first fine filter and the second fine filter all export with slurry oil and are directly communicated with, again back flushing is carried out to prefilter, prefilter after back flushing is communicated with the fine filter reaching finish-time more afterwards, until prefilter obtains the filter cake of required filter thickness.
Preferably, in the slurry oil filtering system of described catalytic cracking unit, along with continuing of filtration procedure, back flushing is carried out to the fine filter reaching finish-time, now predetermined pending whole flow slurry oils are all filtered by still exporting with slurry oil the fine filter be directly communicated with, fine filter after flushing is communicated with the prefilter of the filter cake obtaining required filter thickness, at this moment make a reservation for pending whole flow slurry oils again by the straight-through branch road with fine filter and with prefilter and these two branch roads of the branch road of fine filter filter.
The present invention is compared to known filtering system, and it is long that maximum advantage is exactly the life-span.Existing filtering system can only work about 3 months for the slurry oil containing colloidal pitch matter just to be needed to change, and filtering system of the present invention can work 2 ~ 3 years, affects the shutoff of filter core because it reduces colloid to greatest extent.
Accompanying drawing explanation
Fig. 1 is the structural representation of a preferred embodiment of the present invention.
Embodiment
Characteristic on above-mentioned purpose of the present invention and structure and fuction thereof, is explained the preferred embodiment according to institute's accompanying drawings.
As shown in Figure 1, the slurry oil filtering system of catalytic cracking unit of the present invention, comprising: prefilter, is wherein provided with pre-filtering filter core, and described prefilter is provided with directly exports with slurry oil the pipeline be connected; At least two fine filters, wherein each fine filter is all connected with described prefilter, and be provided with smart filter core in described fine filter, the precision of described smart filter core is greater than the precision of described pre-filtering filter core, and all described fine filters are also provided with directly export with slurry oil the pipeline be connected; Controlling System, it controlled all fine filters before not forming cake layer, and its smart filter core does not all contact with original slurry oil to be filtered, and only contacts with the slurry oil that have passed the prefilter forming cake layer.Valve is provided with between prefilter and slurry oil export; Also be provided with valve between prefilter and fine filter, be also provided with valve between slurry oil outlet and fine filter, all can carry out separately the control of connecting and disconnecting.
The unloading phase that control process of the present invention being divided into and working stage.
Unloading phase: the slurry oil first passing into 1/2nd amounts into whole pending amount, now prefilter is not communicated with the first fine filter, but is communicated with scum pipe, directly enters into deslagging tank by scum pipe.Like this, described two/to be only discharged by prefilter once the slurry oil of amount, its objective is in order to shape first on prefilter generates cake layer.After the cake layer on prefilter reaches filtering requirement, close the connected relation between prefilter and scum pipe, and prefilter is communicated with the first fine filter.Now the slurry oil of 1/2nd amounts is by normally performing filtration treatment with the prefilter of filter cake and the first fine filter.Along with the carrying out of filtering, the filter cake on the first fine filter constantly thickens.When thickening to filtering requirement, slurry oil is directly communicated with the first fine filter, by the slurry oil of the first fine filter direct filtration 1/2nd amount.And in the process, along with the filter cake on the first fine filter constantly thickens, the filter cake on prefilter is also thicker than the thickness needed for filtering requirement.Therefore after slurry oil is directly communicated with the first fine filter, need to carry out back flushing to vacant prefilter out again, remove cake layer blocked up on it (if prefilter is larger, and form blocked up cake layer, then remove without the need to completing the cake layer that blocked up cake layer forms applicable thickness more again).The related filter cake slag of liquid of back flushing enters into deslagging tank.Then the prefilter eliminating cake layer is communicated with the first fine filter again, and cuts off described first fine filter and be communicated with the direct of slurry oil.Like this after filtration for some time, cake layer can be formed on prefilter again.After the cake layer that prefilter is formed reaches filtering requirement, cut off the connected relation of prefilter and the first fine filter, and described first fine filter is communicated with the direct of slurry oil, and prefilter is communicated with the second fine filter.Unloading phase, completes.
Working stage: the slurry oil of whole pending amount is passed into filtering system of the present invention, wherein prefilter and the second fine filter serial communication, and the first fine filter is directly communicated with slurry oil.At this moment, the slurry oil of whole pending amount is passed in system, owing to comprising two branch roads, i.e. prefilter and the second fine filter branch road and the first fine filter branch road, and in these two branch roads, the liquid drift angle of prefilter and the second fine filter branch road is relatively little, and the liquid drift angle of the first fine filter branch road is relatively large, and therefore pending slurry oil tends to be filtered by prefilter and the second fine filter branch road.Consider that fluctuation may appear in the flow of the slurry oil of whole pending amount, if two branch roads all fluctuate, and influence each other, certainly will cause being difficult to control to filtering system.Therefore, prefilter less for liquid drift angle and the second fine filter branch road are controlled in 1/2nd of the whole pending amount preset by flowrate control valve, and the flowrate control valve on the first fine filter branch road does not play control action kou, by remaining whole slurry oils in making the first fine filter lead directly to.When on the second fine filter, filter cake thickness reaches filtration needs value, the second fine filter is directly communicated with slurry oil.Now, slurry oil is all directly be communicated with the first fine filter and the second fine filter.At this moment back flushing is carried out to prefilter.Prefilter after back flushing is communicated with the second fine filter, until obtain the filter cake of required filter thickness.Here it can be the time fixed according to filtering conditions, in certain hour before the first fine filter reaches finish-time soon, be communicated with the second fine filter by prefilter after back flushing, described certain hour is exactly the enough time that prefilter can be made to obtain the filter cake of required filter thickness again.Also can be back flushing is carried out to prefilter after, just the prefilter after back flushing is communicated with the second fine filter, when the filter cake thickness on prefilter reaches required filter thickness, then disconnects connection.Along with the continuation of filtration procedure, filter cake thickness on first fine filter increases gradually, when being increased to end of a period value, disconnection slurry oil is communicated with the first fine filter, and open the flowrate control valve of the second fine filter, allow slurry oil all be filtered by the second fine filter, and back flushing is carried out to the first fine filter.The first fine filter after anti-cleaning is communicated with prefilter, now i.e. prefilter and the first fine filter branch road and the second fine filter branch road, and in these two branch roads, the liquid drift angle of prefilter and the first fine filter branch road is relatively little, and the liquid drift angle of the second fine filter branch road is relatively large, therefore pending slurry oil tends to be filtered by prefilter and the first fine filter branch road.Therefore, prefilter less for liquid drift angle and the first fine filter branch road are controlled in 1/2nd of the whole pending amount preset by flowrate control valve, and the flowrate control valve on the second fine filter branch road does not play control action kou, by remaining whole slurry oils in making the second fine filter lead directly to.Now a working stage completes, and whole duration is approximately 4 hours.
When entering into second working stage, be first that wait first fine filter forms required cake layer, after formation, the first fine filter be all directly communicated with slurry oil with the second fine filter.At this moment again back flushing is carried out to prefilter, and the prefilter after back flushing is communicated with the first fine filter, to generate required filter cake thickness.Be that filter cake thickness on wait second fine filter increases gradually afterwards, be increased to end of a period value.
Iterative cycles thus, works incessantly, and can work time of 2 ~ 3 years.
Only the above, be only better feasible embodiment of the present invention, the change that the above-mentioned method of all the present invention of utilization, shape, structure, device are done, and all should be contained in the right of this case.
Claims (11)
1. a slurry oil filtering system for catalytic cracking unit, is characterized in that, comprising:
At least one prefilter, is wherein provided with pre-filtering filter core, and described prefilter is provided with directly exports with slurry oil the pipeline be connected;
At least two fine filters, wherein each fine filter is all connected with described prefilter, and be provided with smart filter core in described fine filter, the precision of described smart filter core is greater than the precision of described pre-filtering filter core, and all described fine filters are also provided with directly export with slurry oil the pipeline be connected;
Controlling System, it controlled all fine filters before not forming cake layer, and its smart filter core does not all contact with original slurry oil to be filtered, and only contacts with the slurry oil that have passed the prefilter forming cake layer.
2. the slurry oil filtering system of catalytic cracking unit as claimed in claim 1, it is characterized in that, the control process of described Controlling System divides two stages to control filtering system, comprising:
Unloading phase, first on the pre-filtering filter core of prefilter, generate filter cake in this stage, then this prefilter is communicated with a fine filter, while carrying out filtering, this fine filter forms filter cake, on all the other fine filters, forms filter cake successively more afterwards;
Working stage, when the filter cake thickness of this stage prefilter is blocked up, carries out back flushing to prefilter, and now each fine filter all directly and slurry oil outlet; And when prefilter needs to generate cake layer, prefilter is communicated with a fine filter.
3. the slurry oil filtering system of catalytic cracking unit as claimed in claim 2, is characterized in that,
The pre-filtering filter core of described prefilter is wedge wire winded filtering core; The smart filter core of described fine filter is porous metal filter core.
4. the slurry oil filtering system of catalytic cracking unit as claimed in claim 3, is characterized in that, unloading phase only process described filtering system and make a reservation for two in pending whole flow slurry oils/first-class gauging slurry.
5. the slurry oil filtering system of catalytic cracking unit as claimed in claim 4, it is characterized in that, at least one prefilter described is one, and described at least two fine filters are two, be respectively the first fine filter and the second fine filter, and control process unloading phase of described is as follows:
First in prefilter, pass into the slurry oil of 1/2nd flows, these slurry oils flow through prefilter and directly enter into deslagging tank, and on prefilter, shape generates cake layer gradually thus; After the cake layer on prefilter reaches filtering requirement, prefilter is communicated with the first fine filter, filtration treatment is carried out to the slurry oil of 1/2nd flows, along with the carrying out of filtering, filter cake on first fine filter constantly thickens, when thickening to filtering requirement, slurry oil outlet is directly communicated with the first fine filter; Again prefilter is communicated with the second fine filter.
6. the slurry oil filtering system of the catalytic cracking unit as described in claim 4 or 5, is characterized in that, the control process unloading phase of described also comprises:
After slurry oil outlet is directly communicated with the first fine filter, back flushing is carried out to prefilter, back flushing filter cake slag is out drained in deslagging tank, then the prefilter eliminating cake layer is communicated with the first fine filter again, and cut off described first fine filter and be communicated with the direct of slurry oil, after filtration for some time, can form cake layer on prefilter again, this is communicated with the second fine filter by prefilter again.
7. the slurry oil filtering system of catalytic cracking unit as claimed in claim 6, it is characterized in that, the control process of described working stage also comprises:
Predetermined pending whole flow slurry oils are passed into filtering system of the present invention, wherein prefilter and the second fine filter serial communication, and the first fine filter and slurry oil are directly communicated with, slurry oil is filtered by prefilter and the second fine filter branch road and the first fine filter branch road.
8. the slurry oil filtering system of catalytic cracking unit as claimed in claim 7, is characterized in that,
Flowrate control valve on prefilter and the second fine filter branch road is placed through 1/2nd of predetermined pending whole flows, and the flowrate control valve on the first fine filter branch road is not controlled.
9. the slurry oil filtering system of catalytic cracking unit as claimed in claim 8, is characterized in that,
Second fine filter after on the second fine filter, filter cake thickness reaches filtering requirement, is directly communicated with slurry oil after being filtered by prefilter and the second fine filter branch road by slurry oil.
10. the slurry oil filtering system of catalytic cracking unit as claimed in claim 9, it is characterized in that, after the first fine filter and the second fine filter all export with slurry oil and are directly communicated with, again back flushing is carried out to prefilter, prefilter after back flushing is communicated with the fine filter reaching finish-time more afterwards, until prefilter obtains the filter cake of required filter thickness.
The slurry oil filtering system of 11. catalytic cracking unit as claimed in claim 10, is characterized in that,
Along with continuing of filtration procedure, back flushing is carried out to the fine filter reaching finish-time, now predetermined pending whole flow slurry oils are all filtered by still exporting with slurry oil the fine filter be directly communicated with, fine filter after flushing is communicated with the prefilter of the filter cake obtaining required filter thickness, at this moment make a reservation for pending whole flow slurry oils again by the straight-through branch road with fine filter and with prefilter and these two branch roads of the branch road of fine filter filter.
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| CN111592909B (en) * | 2019-02-20 | 2021-06-25 | 中国石油化工股份有限公司 | Oil slurry filtering system and oil slurry filtering method thereof |
| WO2020169064A1 (en) * | 2019-02-20 | 2020-08-27 | 中国石油化工股份有限公司 | Oil slurry filter, oil slurry filtering unit containing the same, oil slurry filtering system and oil slurry filtering method |
| CN112708457B (en) * | 2019-10-24 | 2022-12-13 | 中国石油化工股份有限公司 | Oil slurry hydrotreatment system and treatment method thereof |
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