CN111589223A - Multistage oil slurry filtering system and oil slurry filtering method - Google Patents

Multistage oil slurry filtering system and oil slurry filtering method Download PDF

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Publication number
CN111589223A
CN111589223A CN201910125364.5A CN201910125364A CN111589223A CN 111589223 A CN111589223 A CN 111589223A CN 201910125364 A CN201910125364 A CN 201910125364A CN 111589223 A CN111589223 A CN 111589223A
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China
Prior art keywords
filter
filtering
filtering unit
flexible
layer
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Pending
Application number
CN201910125364.5A
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Chinese (zh)
Inventor
胡志海
韩勇
邵志才
王灵萍
牛传峰
陈坦
刘法
肖锦山
邓中活
李莎莎
田鹏程
叶巍
张哲民
徐文静
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Shanghai Samyo Fluid Technology Co ltd
Sinopec Research Institute of Petroleum Processing
China Petroleum and Chemical Corp
Original Assignee
Shanghai Samyo Fluid Technology Co ltd
Sinopec Research Institute of Petroleum Processing
China Petroleum and Chemical Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by Shanghai Samyo Fluid Technology Co ltd, Sinopec Research Institute of Petroleum Processing, China Petroleum and Chemical Corp filed Critical Shanghai Samyo Fluid Technology Co ltd
Priority to CN201910125364.5A priority Critical patent/CN111589223A/en
Priority to KR1020217030361A priority patent/KR20210134678A/en
Priority to TW109105549A priority patent/TW202108751A/en
Priority to US17/432,719 priority patent/US20220152534A1/en
Priority to SG11202109133RA priority patent/SG11202109133RA/en
Priority to PCT/CN2020/076016 priority patent/WO2020169064A1/en
Publication of CN111589223A publication Critical patent/CN111589223A/en
Pending legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D37/00—Processes of filtration
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
    • B01D29/11—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with bag, cage, hose, tube, sleeve or like filtering elements
    • B01D29/13—Supported filter elements
    • B01D29/23—Supported filter elements arranged for outward flow filtration
    • B01D29/27—Filter bags
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
    • B01D29/50—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with multiple filtering elements, characterised by their mutual disposition
    • B01D29/52—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with multiple filtering elements, characterised by their mutual disposition in parallel connection
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
    • B01D29/50—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with multiple filtering elements, characterised by their mutual disposition
    • B01D29/56—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with multiple filtering elements, characterised by their mutual disposition in series connection
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D37/00—Processes of filtration
    • B01D37/04—Controlling the filtration
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/28—Layered products comprising a layer of synthetic resin comprising synthetic resins not wholly covered by any one of the sub-groups B32B27/30 - B32B27/42
    • B32B27/281—Layered products comprising a layer of synthetic resin comprising synthetic resins not wholly covered by any one of the sub-groups B32B27/30 - B32B27/42 comprising polyimides
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/30—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
    • B32B27/304—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers comprising vinyl halide (co)polymers, e.g. PVC, PVDC, PVF, PVDF
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10C—WORKING-UP PITCH, ASPHALT, BITUMEN, TAR; PYROLIGNEOUS ACID
    • C10C1/00—Working-up tar
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10G—CRACKING HYDROCARBON OILS; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVE HYDROGENATION, OLIGOMERISATION, POLYMERISATION; RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, OR GASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; MINERAL WAXES
    • C10G31/00—Refining of hydrocarbon oils, in the absence of hydrogen, by methods not otherwise provided for
    • C10G31/09—Refining of hydrocarbon oils, in the absence of hydrogen, by methods not otherwise provided for by filtration

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Engineering & Computer Science (AREA)
  • Organic Chemistry (AREA)
  • Materials Engineering (AREA)
  • General Chemical & Material Sciences (AREA)
  • Filtering Materials (AREA)

Abstract

A multistage oil slurry filtering system and an oil slurry filtering method are provided, wherein the multistage oil slurry filtering system comprises a first-stage filtering unit, a second-stage filtering unit and a third-stage filtering unit; a first filter with a flexible filtering material I and without a pinhole filter bag is arranged in the primary filtering unit, and an automatic backwashing filtering device with a driving mechanism is arranged in the secondary filtering unit; and a second filter without a pinhole filter bag and made of flexible filter materials II is arranged in the third-stage filtering unit. By adopting the multistage oil slurry filtering system and the filtering method provided by the invention, the oil slurry filtering process can run stably for a long time, and the problems that the filtering material is easy to be blocked by high-viscosity colloid impurities, the regeneration efficiency is poor and the removal efficiency is low are solved.

Description

Multistage oil slurry filtering system and oil slurry filtering method
Technical Field
The invention relates to a multistage oil slurry filtering system and an oil slurry filtering method.
Background
Catalytic cracking is an important process technology for producing gasoline and diesel oil by converting heavy oil into light oil, is one of the most important and widely applied technologies in the field of oil refining at present, but produces a byproduct of slurry oil by catalytic cracking, particularly, hydrogenated residual oil or wax oil mixed with the hydrogenated residual oil is mostly adopted as a raw material in the present catalytic cracking process, the yield of the slurry oil is high, generally about 5%, and the yield is even 8%. The oil slurry is rich in polycyclic aromatic hydrocarbon, the polycyclic aromatic hydrocarbon can be used as raw materials for producing ship fuel or carbon black, carbon fiber and the like, but the oil slurry contains about 1-6 g/L of catalytic cracking catalyst particles, so that the requirement of the raw materials for producing the ship fuel or the carbon black, the carbon fiber and the like cannot be met, and the utilization value is low at present.
In order to improve the utilization value of the oil slurry, the solid particles in the oil slurry must be removed firstly. There are various methods for removing solid particles, such as settling, flocculation, centrifugation, etc., but these methods have too low removal efficiency. Filtration is a good method for removing solid particles in oil slurry, but a multi-stage filtration method is adopted to improve the filtration precision.
CN102002385A discloses a device and a method for separating residues from catalytic cracking slurry oil, wherein the device comprises at least two filter groups, each filter group comprises a prefilter and a fine filter, the prefilter is a wedge-shaped metal winding wire filter element, the filtering precision is 2-10 microns, and the fine filter is an asymmetric metal powder sintering filter element, the precision is 0.2-1.0 micron.
CN103865571A describes a method for removing solid particles from heavy oil, wherein a filtering system comprises at least one prefilter and at least two fine filters, wherein the precision of filter elements of the fine filters is better than that of the prefilter, and the prefilter is connected with the fine filters in series. The method for reforming the filter cake of the fresh or backflushed fine filter is to adopt the filtrate filtered by the prefilter to form the filter cake on the fine filter, and not to allow the original liquid to be filtered to directly form the filter cake on the fine filter.
In the prior art, a filter group consisting of a low-precision prefilter and a high-precision fine filter with different precisions is generally adopted for filtering, the manufacturing is complex, and the cost of the fine filter is higher.
Disclosure of Invention
The invention aims to provide a multistage oil slurry filtering system and an oil slurry filtering method thereof, which aim to solve the problems of complex oil slurry filtering process, short operation period, high cost and the like in the prior art.
The invention provides a multistage oil slurry filtering system which comprises a first-stage filtering unit, a second-stage filtering unit and/or a third-stage filtering unit;
the primary filtering unit is internally provided with at least one first filter, an oil slurry inlet pipeline, a filtered oil outlet pipeline and a filter residue discharge pipeline which are respectively communicated with each filter, a non-pinhole filter bag made of a flexible filtering material I is arranged in the first filter, and the flexible filtering material I is selected from one or more of polypropylene, polyethylene, nylon, terylene, polyphenylene sulfide, polyimide, polytetrafluoroethylene, aramid fiber, polyurethane and glass fiber, or a material formed by compounding more than any two of the above materials; the gram weight of the flexible filtering material I is 520-660 g/m2；
The secondary filtering unit is internally provided with an automatic backwashing filtering device with a driving mechanism;
the three-stage filtering unit is internally provided with at least one second filter, a pinhole-free filter bag made of a flexible filtering material II is arranged in the second filter, and the flexible filtering material II is selected from one or more of polypropylene, polyethylene, nylon, terylene, polyphenylene sulfide, polyimide, polytetrafluoroethylene, aramid fiber, polyurethane, glass fiber and vinylon, or a material formed by compounding more than any two of the above materials;
the filtering precision of the filtering material of the primary filtering unit is 2-15 microns, the filtering precision of the filtering material of the secondary filtering unit is smaller than that of the filtering material of the primary filtering unit, and the filtering precision of the filtering material of the tertiary filtering unit is smaller than that of the filtering material of the primary filtering unit;
the filtered oil outlet pipeline of the first-stage filtering unit is respectively communicated with the inlet pipeline of the second-stage filtering unit and the inlet pipeline of the third-stage filtering unit.
In the present invention, a smaller value of the filtration accuracy indicates that the solid particles capable of being intercepted by filtration are smaller.
The multistage oil slurry filtering system provided by the invention comprises a first-stage filtering unit, a second-stage filtering unit and/or a third-stage filtering unit, and is characterized by multiple implementation modes.
In one embodiment, the multistage oil slurry filtering system is provided with a primary filtering unit and a secondary filtering unit, wherein a filtered oil outlet pipeline of the primary filtering unit is communicated with an inlet pipeline of the secondary filtering unit.
In another embodiment, the multistage oil slurry filtering system is provided with a primary filtering unit and a tertiary filtering unit, wherein a filtered oil outlet pipeline of the primary filtering unit is communicated with an inlet pipeline of the tertiary filtering unit.
In a third embodiment, the multistage slurry filtration system of the present invention is provided with a primary filtration unit, a secondary filtration unit and a tertiary filtration unit. The filtered oil outlet pipeline of the first-stage filtering unit is respectively communicated with the inlet pipelines of the second-stage filtering unit and the third-stage filtering unit, and the filtered oil outlet pipeline of the second-stage filtering unit is communicated with the inlet pipeline of the third-stage filtering unit.
In order to achieve a better oil slurry filtering effect and prolong the service time of a filtering system, the flexible filtering material I is preferably at least provided with a solid removing layer and a base cloth layer, the porosity of the solid removing layer is 85-98%, and the porosity of the base cloth layer is 30-40%; the warp-wise breaking strength of the flexible filtering material I is 850N/5 cm-2400N/5 cm, the weft-wise breaking strength is 1200N/5 cm-2600N/5 cm, and the thickness is 1.8-2.9 mm.
Preferably, the base fabric layer is polytetrafluoroethylene and/or polyphenylene sulfide. The base cloth layer is made of single polytetrafluoroethylene material, or single polyphenylene sulfide material, or mixed fiber of the two materials.
In one preferred embodiment of the present invention, the base fabric layer is made of polytetrafluoroethylene filament fibers.
In order to achieve a better oil slurry filtering effect, the solid removing layer is preferably polytetrafluoroethylene with a three-dimensional void structure.
According to the invention, the non-pinhole filter bag made of the flexible filter material I is adopted in the first filter, and the preferred flexible filter material I has the characteristics of strong chemical stability, good wear resistance and fatigue resistance, strong particulate interception performance, high filter precision and good material strength.
The flexible filtering material I adopted by the invention is at least provided with the curing layer and the base cloth layer, but the flexible filtering material I is not limited to the curing layer and the base cloth layer, and can be changed and derived on the basis.
In a preferred embodiment of the present invention, the flexible filtering material I is added with a layer on the basis of the above-mentioned release layer and the base fabric layer. Namely, the flexible filtering material I is at least 3 layers, namely a de-fixing layer, a base fabric layer and an inner layer, wherein the inner layer is fibers with the fineness of 1-3D formed by needling or spunlacing on the base fabric layer. The fiber is one or more selected from polypropylene, polyethylene, chinlon, terylene, polyphenylene sulfide, polyimide, polytetrafluoroethylene, aramid fiber, polyurethane and glass fiber; preferably one or more selected from polyimide, polytetrafluoroethylene, polyphenylene sulfide and glass fiber. Preferably, the inner layer is added with high-strength fibers, so that the strength of the flexible filtering material I can be further improved, and the plastic deformation of the flexible filtering material I under the action of long-time continuous load is reduced. In the invention, when the flexible filtering material I is at least a curing layer, a base cloth layer and an inner layer, the material and specific parameters of the curing layer and the base cloth layer are consistent with those of the curing layer and the base cloth layer.
In a preferred embodiment of the present invention, the flexible filtering material I is formed by adding two layers to the above-mentioned release layer and the base fabric layer. The flexible filter material I is at least 4 layers, namely a de-fixing layer, a precision layer, a base fabric layer and an inner layer, wherein the precision layer is made of superfine fibers with the needle punching or water punching fineness of 0.2-0.3D, and the inner layer is made of fibers with the needle punching or water punching fineness of 1-3D. The superfine fiber of the precision layer is one or more selected from polypropylene, polyethylene, chinlon, terylene, polyphenylene sulfide, polyimide, polytetrafluoroethylene, aramid fiber, polyurethane and glass fiber; preferably one or more selected from polyimide, polytetrafluoroethylene, polyphenylene sulfide and glass fiber. The fiber of the inner layer is one or more selected from polypropylene, polyethylene, chinlon, terylene, polyphenylene sulfide, polyimide, polytetrafluoroethylene, aramid fiber, polyurethane and glass fiber; preferably one or more selected from polyimide, polytetrafluoroethylene, polyphenylene sulfide and glass fiber.
Preferably, the fibers with smaller fineness are added into the precision layer, and due to the interaction among the superfine fibers, a three-dimensional structure is formed, so that the filtering efficiency and the filtering precision of the flexible filtering material I can be further improved. On the other hand, the surface contact area and the surface tension are enlarged, so that the solid releasing layer and the precision layer are more firmly adhered, the falling is avoided, and the service cycle of the first filter is further prolonged. In the invention, when the flexible filtering material I is at least a curing layer, a precision layer, a base cloth layer and an inner layer, the materials and specific parameters of the curing layer and the base cloth layer are consistent with those of the curing layer and the base cloth layer.
In a preferable case, the non-pinhole filter bag made of the flexible filter material I is prepared by adopting a sewing process, and the sewing holes of the non-pinhole filter bag are sealed by using an acid sealant material.
In a preferable case, the lower part of the first filter is provided with an oil slurry inlet, the upper part of the first filter is provided with a filtered oil outlet, the bottom of the first filter is provided with a filter residue outlet, and the first filter is provided with a purging medium inlet. Further preferably, a purge medium inlet is provided at the top of the first filter and/or at the upper part of the first filter.
In a preferred case, the first-stage filtering unit comprises a purging medium buffer tank, and an outlet of the purging medium buffer tank is communicated with the first filter purging medium inlet.
In the present invention, one first filter may be provided in the first-stage filtration unit, or two or more first filters may be provided. When a plurality of first filters are provided, the present invention does not limit any connection manner. The plurality of first filters can be arranged in parallel or in series, or can be switched to be used, or can be used in parallel and series. When a plurality of first filters are provided, a plurality of first filters having the same filtering accuracy may be used, or a plurality of first filters having different filtering accuracies may be used.
In the invention, an automatic backwashing filter device with a driving mechanism is arranged in the secondary filter unit; preferably filter equipment includes cylindric casing, cylindric filter screen, unloads sediment mechanism, flushing oil entry, filter residue export, unload the sediment mechanism setting and be connected with actuating mechanism in the inboard of cylindric filter screen. The filtering device can automatically carry out the back washing of the filter screen by monitoring the pressure difference. When the back washing is started, the motor drives the slag discharging mechanism positioned on the inner side of the filter screen to rotate, the interior of the rotating slag discharging mechanism is communicated with an external low-pressure tank through a pipeline, the washing oil enters a low-pressure area of the slag discharging mechanism through the local contact part of the slag discharging mechanism and the filter screen, and the filter screen is back washed by the washing oil. Because the slag discharging mechanism rotates, the back washing regeneration of the full filter screen can be completed after one rotation.
In the present invention, the filtering material of the secondary filtering unit is not limited at all. The filter fineness that the second grade filter unit filtered the material is less than the filter fineness that the first grade filter unit filtered the material, and preferred second grade filter unit filters the filter fineness of material and is 1 ~ 7 microns, and further preferred 1 ~ 5 microns.
Preferably, the filtering area of the secondary filtering unit filtering device is 1/20-1/10 times of that of the first filter.
In the invention, at least one second filter is arranged in the third-stage filtering unit, a pinhole-free filter bag made of flexible filtering material II is arranged in the second filter, and the flexible filtering material II is selected from one or more of polypropylene, polyethylene, nylon, terylene, polyphenylene sulfide, polyimide, polytetrafluoroethylene, aramid fiber, polyurethane, glass fiber and vinylon, or a material formed by compounding more than two of the above materials.
Preferably, the porosity of the flexible filtering material II is 85-98%, and the gram weight is 300-1000 g/m2。
Preferably, the thickness of the flexible filter material II is 0.5-3.0 mm, the warp breaking strength is 1000N/5 cm-9000N/5 cm, and the weft breaking strength is 1000N/5 cm-11000N/5 cm.
In the invention, the filtering precision of the filtering material of the third-level filtering unit is smaller than that of the filtering material of the first-level filtering unit, and preferably, the filtering precision of the filtering material of the third-level filtering unit is 0.2-1.0 micron.
In a preferred case, the filtering area of the second filter is larger than that of the first filter; more preferably, the filtration area of the second filter is 1.5 to 20 times the filtration area of the first filter.
The oil slurry filtering system provided by the invention adopts multistage filtering units, and a non-pinhole filtering bag made of a flexible filtering material I is adopted in a first filter of the primary filtering unit, and the preferable flexible filtering material I has the characteristics of strong interception on particles, high filtering precision and good material strength. Due to the adoption of the flexible filtering material, the defect that the hard filtering material is easy to be blocked by fine solid particles is overcome, the filtering efficiency is improved, and the operation period of the whole oil slurry filtering system is prolonged. And in the arrangement of the secondary filtering unit and/or the tertiary filtering unit at the downstream of the primary unit, the overall filtering precision of the filtering system is further improved. In addition, the oil slurry filtering system provided by the invention has the characteristics of convenience in slag unloading, good back flushing effect and good regeneration performance of filtering materials.
The invention also provides an oil slurry filtering method, which adopts any one of the oil slurry filtering systems, and comprises the following steps:
the oil slurry enters a first filter with a flexible filtering material I and without a pinhole filter bag through an oil slurry inlet pipeline communicated with the primary filtering unit for filtering, and the filtered oil is pumped out from a filtered oil outlet pipeline and enters a secondary filtering unit and/or a tertiary filtering unit for secondary filtering;
the secondary filtering unit is internally provided with an automatic backwashing filtering device with a driving mechanism;
at least one second filter with a non-pinhole filter bag made of flexible filter material II is arranged in the third-stage filtering unit;
the slurry is a liquid hydrocarbon with particulate impurities.
Preferably, the filtering temperature in the first filter is 30 to 250 ℃, preferably 50 to 240 ℃, and more preferably 60 to 180 ℃.
Preferably, the pressure difference of the first filter in use is 0.01 to 0.5 MPa.
The filter cake formed on the flexible filtering material I is beneficial to further improving the filtering and separating efficiency, and the filtering precision which can be realized after the filter cake is formed is superior to the precision of the flexible filtering material I. The present invention preferably employs a filtration process that monitors the pressure differential to control the cake thickness.
In one preferred embodiment of the invention, the first filter after use is back-purged with a purge medium.
Preferably, the purging medium is an inert gas and/or a flushing oil. The inert gas is a gas which does not react with the oil slurry and the particles in the filtering system, and is preferably nitrogen. In some cases, fuel gas may also be selected. The flushing oil is preferably filtered oil, which may be the filtered oil obtained by the filtration system itself.
When a first filter is arranged in the first-stage filtering unit of the slurry filtering system, the operation is preferably carried out in a mode of alternately carrying out a filtering mode and a purging mode.
When the primary filtering unit of the oil slurry filtering system is provided with a plurality of first filters, the operation is preferably carried out in a mode that the online first filters and the standby first filters are switched alternately. When the pressure differential across the on-line first filter reaches or exceeds the pressure differential set point, the standby first filter may be switched into the filtration system and the on-line first filter switched out of the filtration system for back purging and slag removal. The filter residue discharged from the liquid mixture has good fluidity and can be directly discharged out of the filtering system according to the requirements of the process or returned to the process for reuse; the filter cake can also be stabilized, dried in the first filter and discharged directly from the filtration system in the form of a completely solidified residue.
In the invention, one or more second filters are arranged in the three-stage filtering unit of the oil slurry filtering system, and the filtering temperature in the second filter is preferably 30-250 ℃, and more preferably 60-180 ℃.
Preferably, the second filter is not back-purged or back-flushed. The second filter adopts a filtering mode of inward-entering and outward-exiting, and impurities are completely placed in the second filter.
Compared with the prior art, the multistage oil slurry filtering system and the filtering method provided by the invention can realize long-term stable operation of high-concentration colloid-containing viscous catalyst materials, and solve the problems that the filtering material is easy to be blocked by high-viscosity colloid impurities, the regeneration efficiency is poor and the removal efficiency is low. And the slag discharging mode is flexible, and the problem of environmental pollution caused by organic materials of the catalyst is effectively solved.
Drawings
FIG. 1 is a schematic structural diagram of a multi-stage slurry filtration system provided by the present invention.
FIG. 2 is a schematic diagram of one embodiment of a primary filtration unit provided by the present invention.
FIG. 3 is a schematic diagram of another embodiment of a primary filter unit provided by the present invention.
Detailed Description
The invention will be further described with reference to the accompanying drawings, but the invention is not limited thereto.
FIG. 1 is a schematic structural diagram of a multi-stage slurry filtration system provided by the present invention. As shown in fig. 1, the multistage oil slurry filtering system provided by the invention comprises a first-stage filtering unit 1, a second-stage filtering unit 2 and a third-stage filtering unit 3. At least one first filter is arranged in the primary filtering unit 1, and a non-pinhole filter bag made of flexible filtering materials I is arranged in the first filter. And a filtering device with a driving mechanism and automatic back washing is arranged in the secondary filtering unit 2. At least one second filter is arranged in the third-stage filtering unit 3, and a non-pinhole filter bag made of flexible filtering materials II is arranged in the second filter. The primary filtering unit 1 is provided with an oil slurry inlet pipeline 4 and a filter residue outlet pipeline 10, a filtered oil outlet pipeline 5 of the primary filtering unit 1 is communicated with an inlet of the second filtering unit 2, and a filtered oil outlet pipeline 6 of the primary filtering unit 1 is communicated with an inlet of the third filtering unit 3. The second-stage filtering unit 2 is provided with a filter residue outlet pipeline 11 and a filtered oil outlet pipeline 7, and a filtered oil outlet of the second-stage filtering unit 2 is communicated with an inlet of the third-stage filtering unit 3 through a pipeline 9. The third filter unit is provided with a filtered oil outlet line 8.
Fig. 2 is a schematic diagram of a single first filter arranged in the primary filtering unit provided by the invention, and as shown in fig. 2, the primary filtering unit is provided with the first filter 1, and an oil slurry inlet pipeline 3, a filtered oil outlet pipeline 4 and a filter residue discharge pipeline 5 which are communicated with the first filter 1. A non-pinhole filter bag 2 made of a flexible filter material I is arranged in the first filter 1; the flexible filtering material I is selected from one or more of polypropylene, polyethylene, chinlon, terylene, polyphenylene sulfide, polyimide, polytetrafluoroethylene, aramid fiber, polyurethane and glass fiber, or a composite material of any two or more of the above materials. An oil slurry inlet is arranged at the lower part of the first filter 1, a filtered oil outlet is arranged at the upper part of the first filter 1, and a filter residue outlet is arranged at the bottom of the first filter 1. A purge medium inlet is provided at the top and upper part of the first filter 1 and communicates with a purge medium inlet line 6.
Fig. 3 is a schematic diagram of a primary filtering unit provided by the present invention, wherein two first filters are arranged, and as shown in fig. 3, a first filter 1, a first filter 3, an oil slurry inlet line 5 communicated with the first filter 1, a filtered oil outlet line 7 and a residue discharge line 9 are arranged in the primary filtering unit; an oil slurry inlet line 6, a filtered oil outlet line 8 and a residue discharge line 10 communicating with the first filter 3. A non-pinhole filter bag 2 made of a flexible filter material I is arranged in the first filter 1; a non-pinhole filter bag 4 made of a flexible filter material I is arranged in the first filter 3; the flexible filtering material I is selected from one or more of polypropylene, polyethylene, chinlon, terylene, polyphenylene sulfide, polyimide, polytetrafluoroethylene, aramid fiber, polyurethane and glass fiber, or a composite material of any two or more of the above materials. A purging medium inlet is arranged at the top of the first filter 1 and is communicated with a purging medium inlet pipeline 11; the upper part of the first filter 1 is provided with a purging medium inlet and is in communication with a purging medium inlet line 13. A purging medium inlet is arranged at the top of the first filter 3 and is communicated with a purging medium inlet line 12; the upper part of the first filter 3 is provided with a purging medium inlet and is in communication with a purging medium inlet line 14. A communication line 15 is provided between the filtered oil outlet of the first filter 1 and the slurry inlet of the first filter 3.
When the first-stage filtering unit shown in fig. 3 is used for filtering, the first filter 1 and the first filter 3 may be used in parallel, in series, or in a switched manner. When the filter is switched to be used and the first filter 1 is filtered on line, the first filter 3 is subjected to back purging or is in a standby state at the same time; or when the first filter 3 is in-line filtering, the first filter 1 is simultaneously back-purged or in a standby state.
The invention will now be further illustrated with reference to the following examples, without thereby being restricted thereto.
Example 1
The multistage oil slurry filtering system is provided with a first-stage filtering unit, a second-stage filtering unit and a third-stage filtering unit, a filtered oil outlet of the first-stage filtering unit is communicated with an inlet of the second-stage filtering unit, and a filtered oil outlet of the second-stage filtering unit is communicated with an inlet of the third-stage filtering unit.
A single first filter as shown in fig. 2 is arranged in the primary filter unit, and a non-pinhole filter bag made of flexible filter material I is arranged in the first filter. The flexible filtering material I is provided with a solid removing layer and a base cloth layer, and specific property parameters are shown in table 1. The two-stage filtering unit is provided with an automatic back-flushing filtering device with a driving mechanism, the filtering precision of filtering materials is 1.5 microns, and the filtering area is 1/20 times of that of the first filter. A single second filter is arranged in the three-stage filtering unit, a non-pinhole filter bag made of flexible filtering materials II is arranged in the second filter, and specific property parameters are shown in Table 1.
The filtration area of the second filter is 4.5 times the filtration area of the first filter.
TABLE 1
Figure BDA0001973406510000111
Example 2
The multistage oil slurry filtering system is provided with a first-stage filtering unit and a third-stage filtering unit, and a filtered oil outlet of the first-stage filtering unit is communicated with an inlet of the third-stage filtering unit.
Two first filters shown in figure 3 are arranged in the primary filtering unit, and a non-pinhole filter bag made of flexible filtering materials I is arranged in the first filters. The flexible filtering material I is provided with a solid removing layer and a base cloth layer, and specific property parameters are shown in table 2. A single second filter is arranged in the three-stage filtering unit, a non-pinhole filter bag made of flexible filtering materials II is arranged in the first filter in the second filter, and specific property parameters are shown in Table 2.
The filtering area of the second filter is 6 times the filtering area of the first filter.
TABLE 2
Figure BDA0001973406510000121
Example 3
The multistage oil slurry filtering system is provided with a first-stage filtering unit, a second-stage filtering unit and a third-stage filtering unit, a filtered oil outlet of the first-stage filtering unit is communicated with an inlet of the second-stage filtering unit, and a filtered oil outlet of the second-stage filtering unit is communicated with an inlet of the third-stage filtering unit.
Two first filters shown in figure 3 are arranged in the primary filtering unit, and a non-pinhole filter bag made of flexible filtering materials I is arranged in the first filters. The flexible filtering material I is provided with a solid removing layer, a precision layer, a base cloth layer and an inner layer, and specific property parameters are shown in a table 3. The two-stage filtering unit is provided with an automatic back-flushing filtering device with a driving mechanism, the filtering precision of filtering materials is 1 micron, and the filtering area is 1/15 times of that of the first filter. A single second filter is arranged in the three-stage filtering unit, a non-pinhole filter bag made of flexible filtering materials II is arranged in the second filter, and specific property parameters are shown in Table 3.
The filtering area of the second filter is 8 times the filtering area of the first filter.
TABLE 3
Figure BDA0001973406510000131
Example 4
The multistage oil slurry filtering system is provided with a first-stage filtering unit and a second-stage filtering unit, and a filtered oil outlet of the first-stage filtering unit is communicated with an inlet of the second-stage filtering unit.
Two first filters shown in figure 3 are arranged in the primary filtering unit, and a non-pinhole filter bag made of flexible filtering materials I is arranged in the first filters. The flexible filtering material I is provided with a solid removing layer, a base cloth layer and an inner layer, and specific property parameters are shown in table 4. The two-stage filtering unit is provided with an automatic back-flushing filtering device with a driving mechanism, the filtering precision of filtering materials is 2 microns, and the filtering area is 1/15 times of that of the first filter.
TABLE 4
Figure BDA0001973406510000132
Figure BDA0001973406510000141
Example 5
The multistage oil slurry filtering system is provided with a first-stage filtering unit and a third-stage filtering unit, and a filtered oil outlet of the first-stage filtering unit is communicated with an inlet of the third-stage filtering unit.
A single first filter as shown in fig. 2 is arranged in the primary filter unit, and a non-pinhole filter bag made of flexible filter material I is arranged in the first filter. The flexible filtering material I is provided with a solid removing layer, a precision layer, a base cloth layer and an inner layer, and specific property parameters are shown in a table 5. Two second filters are arranged in the three-stage filtering unit, a non-pinhole filter bag made of flexible filtering materials II is arranged in each second filter, and specific property parameters are shown in the table 5.
The filtering area of the second filter is 10 times the filtering area of the first filter.
TABLE 5
Figure BDA0001973406510000142
Figure BDA0001973406510000151
Examples 6 to 8
This set of examples is presented to illustrate the slurry filtration process using the multi-stage slurry filtration system of examples 1-3. The properties of the slurry to be filtered are shown in table 6.
In example 6, slurry a was filtered in a multi-stage slurry filtration system as described in example 1. And the oil slurry A enters a first-stage filtering unit to be filtered in a first filter, and the obtained filtered oil sequentially enters a second-stage filtering unit and a third-stage filtering unit to be filtered to obtain the final filtered oil. The filtering temperature of the first filter is 100 ℃, the filtering is set to the differential pressure of 0.12MPa for back flushing, and nitrogen at 100 ℃ is adopted for back flushing. And monitoring the filtration pressure difference of the inlet and the outlet of the secondary filtration unit, starting the slag discharging mechanism by driving of a motor, and rotating for a circle for 3 s. The filtering temperature of the second filter is 80 ℃, and back flushing is not carried out. The final filtered oil collected was analyzed and had a solid particulate content of 48. mu.g/g.
In example 7, slurry B was filtered in a multi-stage slurry filtration system as described in example 2. And the oil slurry B enters a first-stage filtering unit to be filtered in a first filter, and the obtained filtered oil sequentially enters a second filter of a third-stage filtering unit to be filtered to obtain the final filtered oil. The filtering temperature of the first filter is 140 ℃, the filtering is set to the differential pressure of 0.20MPa for back flushing, and the nitrogen at 140 ℃ is adopted for back flushing. The filtering temperature of the second filter is 120 ℃, and back flushing is not carried out. The final filtered oil collected was analyzed and had a solid particulate content of 77. mu.g/g.
In example 8, slurry C was filtered in a multi-stage slurry filtration system as described in example 3. And the oil slurry C enters a first-stage filtering unit to be filtered in a first filter, and the obtained filtered oil sequentially enters a second-stage filtering unit and a third-stage filtering unit to be filtered to obtain the final filtered oil. The filtering temperature of the first filter is 200 ℃, the filtering is set to the differential pressure of 0.30MPa for back flushing, and nitrogen at 200 ℃ is adopted for back flushing. And monitoring the filtration pressure difference of the inlet and the outlet of the secondary filtration unit, starting the slag discharging mechanism by driving of a motor, and rotating for a circle for 3 s. The filtering temperature of the second filter is 160 ℃, and back flushing is not carried out. The final filtered oil collected was analyzed and had a solid particulate content of 185. mu.g/g.
TABLE 6
Oil slurry A Oil slurry B Oil slurry C
Density (g/cm)3) 1.126 1.115 1.158
Viscosity (mm) at 100 ℃2/s) 39 28 75
Solid particle content (μ g/g) 2352 3520 11200
Examples 9 to 10
This set of examples is presented to illustrate the slurry filtration process using the multi-stage slurry filtration system of examples 4-5. The properties of the coal tar to be filtered are shown in table 7.
In example 9, coal tar a was filtered in a multistage slurry filtration system as described in example 4. The coal tar A enters a first-stage filtering unit to be filtered in a first filter, and the obtained filtered oil enters a second-stage filtering unit to be filtered to obtain the final filtered oil. The filtering temperature of the first filter is 70 ℃, the filtering is set to the pressure difference of 0.3MPa for back flushing, and normal-temperature nitrogen is adopted for back flushing. And monitoring the filtration pressure difference of the inlet and the outlet of the secondary filtration unit, starting the slag discharging mechanism by driving of a motor, and rotating for a circle for 3 s. The final filtered oil collected was analyzed and had a solid particulate content of 151. mu.g/g.
In example 10, coal tar B was filtered in a multistage slurry filtration system as described in example 5. And the coal tar B enters a first-stage filtering unit to be filtered in a first filter, and the obtained filtered oil sequentially enters a second filter of a third-stage filtering unit to be filtered to obtain the final filtered oil. The filtering temperature of the first filter is 90 ℃, the filtering is set to the differential pressure of 0.35MPa for back flushing, and nitrogen at 90 ℃ is adopted for back flushing. The filtering temperature of the second filter is 90 ℃, and back flushing is not carried out. The final filtered oil collected was analyzed and had a solid particulate content of 192. mu.g/g.
TABLE 7
Coal tar A Coal tar B
Density (g/cm)3) 1.21 1.29
Viscosity (mm) at 100 ℃2/s) 3.0 3.6
Solid particle content (μ g/g) 5900 9200

Claims (21)

1. A multi-stage oil slurry filtering system comprises a first-stage filtering unit, a second-stage filtering unit and/or a third-stage filtering unit;
the primary filtering unit is internally provided with at least one first filter, an oil slurry inlet pipeline, a filtered oil outlet pipeline and a filter residue discharge pipeline which are respectively communicated with each filter, a non-pinhole filter bag made of a flexible filtering material I is arranged in the first filter, and the flexible filtering material I is selected from one or more of polypropylene, polyethylene, nylon, terylene, polyphenylene sulfide, polyimide, polytetrafluoroethylene, aramid fiber, polyurethane and glass fiber, or a material formed by compounding more than any two of the above materials; the gram weight of the flexible filtering material I is 520-660 g/m2；
The secondary filtering unit is internally provided with an automatic backwashing filtering device with a driving mechanism;
the three-stage filtering unit is internally provided with at least one second filter, a pinhole-free filter bag made of a flexible filtering material II is arranged in the second filter, and the flexible filtering material II is selected from one or more of polypropylene, polyethylene, nylon, terylene, polyphenylene sulfide, polyimide, polytetrafluoroethylene, aramid fiber, polyurethane, glass fiber and vinylon, or a material formed by compounding more than any two of the above materials;
the filtering precision of the filtering material of the primary filtering unit is 2-15 microns, the filtering precision of the filtering material of the secondary filtering unit is smaller than that of the filtering material of the primary filtering unit, and the filtering precision of the filtering material of the tertiary filtering unit is smaller than that of the filtering material of the primary filtering unit;
the filtered oil outlet pipeline of the first-stage filtering unit is respectively communicated with the inlet pipeline of the second-stage filtering unit and the inlet pipeline of the third-stage filtering unit.
2. The filtration system of claim 1, wherein the flexible filter material I is provided with at least a set-off layer and a scrim layer, wherein the porosity of the set-off layer is 85% to 98%, and the porosity of the scrim layer is 30% to 40%; the warp-wise breaking strength of the flexible filtering material I is 850N/5 cm-2400N/5 cm, the weft-wise breaking strength is 1200N/5 cm-2600N/5 cm, and the thickness is 1.8-2.9 mm.
3. A filter system according to claim 2, wherein said scrim layer is polytetrafluoroethylene and/or polyphenylene sulfide; the solid releasing layer is made of polytetrafluoroethylene with a three-dimensional void structure.
4. A filter system according to claim 3, wherein said base layer is formed from polytetrafluoroethylene filament fibers.
5. The filtration system according to any one of claims 1 to 4, wherein the flexible filtration material I comprises at least 3 layers, namely a release layer, a base fabric layer and an inner layer, and the inner layer is fibers with the fineness of 1-3D formed by needling or water punching on the base fabric layer.
6. A filter system according to claim 5, wherein the fibres of the inner layer are selected from one or more of polyimide, polytetrafluoroethylene, polyphenylene sulphide and glass fibres.
7. The filtration system according to any one of claims 1 to 4, wherein the flexible filtration material I comprises at least 4 layers, namely a release layer, a precision layer, a base fabric layer and an inner layer, wherein the precision layer is made of superfine fibers with the fineness of 0.2-0.3D by needle punching or water punching on the base fabric layer, and the inner layer is made of fibers with the fineness of 1-3D by needle punching or water punching on the base fabric layer.
8. The filtration system of claim 7, wherein the fibers of the inner layer are selected from one or more of polyimide, polytetrafluoroethylene, polyphenylene sulfide, and glass fiber; the superfine fiber of the precision layer is selected from one or more of polyimide, polytetrafluoroethylene, polyphenylene sulfide and glass fiber.
9. The filtration system of claim 1, wherein the lower portion of the first filter is provided with an oil slurry inlet, the upper portion of the first filter is provided with a filtered oil outlet, and the bottom portion of the first filter is provided with a residue outlet; the first filter is provided with a purge media inlet.
10. The filtration system of claim 1, wherein the primary filtration unit comprises a purge media buffer tank, and an outlet of the purge media buffer tank is communicated with the first filter purge media inlet;
the first-stage filtering unit comprises a filtered oil buffer tank, a filtered oil outlet pipeline of the first filter is communicated with an inlet of the filtered oil buffer tank, and an outlet of the filtered oil buffer tank is communicated with an inlet pipeline of the second filtering unit and an inlet pipeline of the third-stage filtering unit.
11. A filtration system according to claim 1, wherein an automatic back-flushing filter device with a drive mechanism is provided in the secondary filtration unit; the filter device comprises a cylindrical shell, a cylindrical filter screen, a slag discharging mechanism, a flushing oil inlet and a filter residue outlet, wherein the slag discharging mechanism is arranged on the inner side of the cylindrical filter screen and is connected with the driving mechanism;
the filtering precision of the filtering material of the secondary filtering unit is 1-7 microns, preferably 1-5 microns.
12. A filter system according to claim 1, wherein the flexible filter material II has a porosity of 85% to 98% and a grammage of 300 to 1000g/m2；
The thickness of the flexible filtering material II is 0.5-3.0 mm, the warp breaking strength is 1000N/5 cm-9000N/5 cm, and the weft breaking strength is 1000N/5 cm-11000N/5 cm.
13. The filtration system of claim 1 or 12, wherein the filtration precision of the material filtered by the tertiary filtration unit is 0.2 to 1.0 μm.
14. The filtration system of claim 1, wherein the second filter has a larger filtration area than the first filter;
preferably, the filtering area of the second filter is 1.5 to 20 times of the filtering area of the first filter.
15. A method of filtering an oil slurry using the filtration system of any one of claims 1 to 14, comprising:
the oil slurry enters a first filter with a flexible filtering material I and without a pinhole filter bag through an oil slurry inlet pipeline communicated with the primary filtering unit for filtering, and the filtered oil is pumped out from a filtered oil outlet pipeline and enters a secondary filtering unit and/or a tertiary filtering unit for secondary filtering;
the secondary filtering unit is internally provided with an automatic backwashing filtering device with a driving mechanism;
at least one second filter with a non-pinhole filter bag made of flexible filter material II is arranged in the third-stage filtering unit;
the slurry is a liquid hydrocarbon with particulate impurities.
16. The method according to claim 15, wherein the filtration temperature in the first filter is 30 to 250 ℃, preferably 50 to 240 ℃, more preferably 60 to 180 ℃.
17. The method of claim 15, wherein the first filter has a differential pressure in use of 0.01 to 0.5 MPa.
18. The method of claim 15, wherein the slurry oil is a catalytic cracking slurry oil and/or coal tar.
19. The method of claim 15, wherein the used first filter is back-purged with a purge medium; the purging medium is inert gas and/or flushing oil.
20. The method of claim 19, wherein the flushing oil is filtered oil.
21. A method according to claim 15, wherein the filtration temperature in the second filter is 30 to 250 ℃, preferably 60 to 180 ℃.
CN201910125364.5A 2019-02-20 2019-02-20 Multistage oil slurry filtering system and oil slurry filtering method Pending CN111589223A (en)

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US6015499A (en) * 1998-04-17 2000-01-18 Parker-Hannifin Corporation Membrane-like filter element for chemical mechanical polishing slurries
CN201940118U (en) * 2011-01-30 2011-08-24 王丹宁 Two-stage filtering slurry oil swirling filter outside catalytic cracking unit
CN203346342U (en) * 2013-07-11 2013-12-18 长岭炼化岳阳工程设计有限公司 Self-adaption sublevel modularization oil slurry filtering separation device
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