CN110669546A

CN110669546A - Catalytic slurry oil filtering device and method suitable for long-period operation

Info

Publication number: CN110669546A
Application number: CN201911051181.XA
Authority: CN
Inventors: 马洪玺; 朱洪; 李雷; 张文军; 陈长祥
Original assignee: Shanghai Lanke Petrochemical Engineering & Technology Co Ltd
Current assignee: Shanghai Lanke Petrochemical Engineering & Technology Co Ltd
Priority date: 2019-10-31
Filing date: 2019-10-31
Publication date: 2020-01-10

Abstract

The invention discloses a catalytic slurry oil filtering device suitable for long-period operation; comprises at least 3 filters; for either filter: the lower part of the filter is provided with an oil slurry feeding pipe and a recycle oil feeding pipe, and the upper part of the filter is provided with a clear liquid conveying pipeline and a back washing air inlet pipe; the bottom of any filter is also connected with a slag discharge pipe; the cleaning solution buffer tank is also included; the bottom of any filter is connected to the cleaning solution buffer tank through a cleaning solution circulating pipeline with a cleaning solution circulating pump, and is connected back to the top of the filter through a cleaning solution circulating pipeline. The device is simple and convenient to operate and suitable for a catalytic oil slurry filtering device which runs continuously for a long period. Meanwhile, a corresponding filtering method is provided, the pre-membrane and regeneration cleaning procedures are combined, the process is simple, the operation is convenient, and the net pressure difference increasing speed of the filter element is reduced to about 1/3-1/7 of the conventional technology, so that the continuous operation period of the oil slurry filtering device is prolonged, and the purpose of long-period and high-precision operation of the oil slurry filtering device is achieved.

Description

Catalytic slurry oil filtering device and method suitable for long-period operation

Technical Field

The invention belongs to the technical field of oil slurry filtration, and particularly relates to a catalytic oil slurry filtration device and method suitable for long-period operation.

Background

The catalytic cracking process of oil refinery uses residual oil and wax oil as raw material, and under the action of catalyst, the obtained products are gasoline, diesel oil and liquefied gas, etc. The catalytic slurry oil is a heavy fraction mixture with extremely special properties generated in the catalytic cracking process of heavy oil, contains a large amount of valuable heavy aromatic hydrocarbon components, and is a raw material for producing carbon black, needle coke, carbon fiber and various chemical products; however, the catalytic slurry oil contains catalyst solid particles mainly comprising aluminum silicate crystals, so that valuable heavy aromatic hydrocarbon components cannot be directly separated; therefore, the catalytic slurry oil can only be used as fuel oil.

In the prior art, a filtration separation method is adopted to separate residual catalyst particles in oil slurry, so that the method is economical in cost and simple in process. At present, two filters are generally adopted, and the continuity of oil slurry filtration is kept by adopting a mode of offline cleaning in turn.

But because the particles in the oil slurry are finer, the particles below 1 micron account for 0.5-5%, the asphaltene in the oil slurry wraps the catalyst, the filter channel of the filter element is easy to block, the filter element is difficult to clean in the process of the back washing procedure, the flux of the filter element is rapidly reduced, the net pressure difference of the filter element (the net pressure difference is the pressure difference caused by the resistance of the filter medium before the filter cake is formed by filtering, the filter element is continuously slowly polluted by the catalyst and the asphaltene in the oil slurry in the filtering process, the void ratio of the filter element is gradually reduced, the filtering resistance is increasingly larger, namely, the net pressure difference is gradually increased) is rapidly increased, within the allowable range of process pressure drop, the single-cycle operation time is shorter and shorter until the operation requirement of filtering back washing can not be met, the filtering device must be stopped, the filter element is replaced, and the maintenance cost is obviously increased. The longest continuous operation period of the currently operated slurry oil filtering device is about 1 year.

Most of the current patent technologies focus on the high precision aspect of slurry oil filtration. For example, chinese patent document CN109868156A discloses a catalytic cracking slurry oil filtering device and method, and specifically provides a cross-flow filtering device, which can stabilize the slurry oil filtered and purified below 50mg/L, but because the flux of cross-flow filtration is small and a large amount of concentrated solution is generated, a large amount of slurry oil circulates between the first membrane filter and the slurry oil raw material tank; in order to solve the problem that the oil slurry stays for a long time in the device for cooling, the heating coil is arranged in the raw material tank to heat the low-temperature oil slurry; in order to solve the problem that the oil slurry in the raw material tank is continuously concentrated, the second membrane filter is adopted to filter the oil slurry with the concentration of more than 20g/L, and the concentration of the circulating raw material is reduced. However, the above technical solutions have the following technical drawbacks: 1. the treatment capacity is small, and the investment is large; 2. the pollution of slurry oil to the filter element is not considered, the filter element cannot continuously run for a long period, and the filter element needs to be continuously replaced.

Therefore, there is an urgent need for the development of a catalytic slurry oil filtration apparatus and method having simple process flow, easy operation, excellent purification effect, and suitable for continuous operation over a long period.

Disclosure of Invention

The invention aims to provide a catalytic slurry oil filtering device and a catalytic slurry oil filtering method which are simple in process flow, simple and convenient to operate, excellent in purification effect and suitable for long-period continuous operation. Specifically, the oil slurry filtering method and device comprising the innovative pre-membrane technology and the filtering filter element online cleaning technology are provided, and the net pressure difference increasing speed of the filter element is reduced to about 1/3-1/7 of the conventional technology. Thereby prolonging the continuous operation period of the oil slurry filtering device and achieving the purpose of long-period and high-precision operation of the oil slurry filtering device.

In order to realize one of the purposes of the invention, the invention provides a catalytic slurry oil filtering device suitable for long-period operation, which adopts the following technical scheme:

a catalytic slurry filtration unit suitable for long-cycle operation comprising at least 3 filters; for either filter: the lower part of the filter is provided with an oil slurry feeding pipe and a recycle oil feeding pipe, and the upper part of the filter is provided with a clear liquid conveying pipeline and a back washing air inlet pipe; the bottom of any filter is also connected with a slag discharge pipe;

the cleaning solution buffer tank is also included; the bottom of any filter is connected to the cleaning solution buffer tank through a cleaning solution circulating pipeline with a cleaning solution circulating pump, and is connected back to the top of the filter through a cleaning solution circulating pipeline.

Preferably, the lower part of any filter is communicated with the slurry feeding pipe through a slurry feeding valve; is communicated with a recycle oil feeding pipe through a recycle oil feeding valve; is communicated with a slag discharge pipe through a slag discharge valve;

the multiple filters are connected in parallel and then are communicated with a cleaning solution circulating pipeline through a cleaning solution feeding valve, and the cleaning solution circulating pump is arranged between the cleaning solution buffer tank and the cleaning solution feeding valve; a cleaning liquid discharge pipe with a cleaning liquid discharge valve is arranged between the downstream of the cleaning liquid feeding valve in the flow direction of the cleaning liquid and the cleaning liquid buffer tank;

the upper part of any filter is communicated with a clear filtrate delivery pipe through a clear filtrate discharge valve; is communicated with the back washing air inlet pipe through a back washing air inlet valve; is communicated with a cleaning solution circulating pipeline through a cleaning solution discharge valve.

The device further comprises a control system, wherein the control system is electrically connected with the oil slurry feed valve, the recycle oil feed valve, the clear liquid filtering discharge valve, the back washing air inlet valve, the slag discharge valve, the cleaning liquid circulating pump, the cleaning liquid feed valve, the cleaning liquid discharge valve and the cleaning liquid discharge valve respectively;

the control system is a PLC control system or a DCS control system.

Preferably, the bottom of the cleaning solution buffer tank is conical, and an inlet of the cleaning solution circulating pump is arranged at a position, 800-1200 mm away from the upper part of the conical bottom, of the cleaning solution buffer tank.

Preferably, the filter comprises a shell and a filter element positioned in the middle of the shell, and the filter element is fixed on the inner wall of the shell through a tube plate.

The invention also aims to provide a catalytic oil slurry filtering method suitable for long-period operation, which comprises the following steps:

s1, continuously filtering at least 2 filters in the plurality of filters, and keeping the rest filters in a recycle oil soaking standby state:

s10, filtering by a filter A: opening an oil slurry feeding valve A and a clear liquid discharging valve A, enabling the oil slurry to enter a filter A and pass through a filter element from outside to inside, and intercepting catalyst particles on the outer surface of the filter element to form a filter cake; the clean oil slurry sequentially passes through the filter cake and the filter element, flows out of the filter A to form a filtrate, and is discharged through a filtrate pipeline; wherein, the thickness of the filter cake can be increased along with the extension of the filtering time, and the flow of the filter A is kept constant by increasing the pressure difference of the filter A until the set filtering time is reached or the pressure difference of the filter reaches a set value;

s11, pre-membrane of filter B: when the filter A reaches the set filtering time or filtering differential pressure value, opening an oil slurry feeding valve B and a clear liquid filtering discharging valve B, feeding the oil slurry into the filter B from an oil slurry feeding pipe, simultaneously filtering the oil slurry by the filter A and the filter B for 1 hour, controlling the oil slurry treatment capacity of the filter B within the range of 1/4-1/2 of full load, and forming a pre-membrane on the surface of a filter element of the filter B, namely finishing the pre-membrane of the filter B;

s12, backwashing of a filter A: closing an oil slurry feeding valve and a clear liquid filtering discharging valve A of the filter A, and performing back washing on the filter A;

s13, filtering by a filter B: adjusting an oil slurry feeding valve B to enable a filter B to filter at full load; catalyst particles are intercepted on the outer surface of the filter element to form a filter cake, and the filtered solution is discharged through a filtered solution pipeline 4; wherein, the thickness of the filter cake can be increased along with the extension of the filtering time, and the flow of the filter B is kept constant by increasing the pressure difference of the filter B until the set filtering time is reached or the pressure difference of the filter reaches a set value;

s14, pre-membrane of filter a: when the filter B operates for a set time or a set pressure difference, an oil slurry feeding valve and a clear liquid filtering discharging valve of the filter A are opened, the filter A after backwashing is restarted to filter, the filter A and the filter B simultaneously perform online filtration for 1 hour, and the oil slurry treatment capacity of the filter A is controlled within the range of 1/4-1/2 of full load, so that pre-membrane of the filter A is completed;

s15, backwashing of a filter B: closing an oil slurry feeding valve and a clear liquid filtering discharging valve B of the filter B, and performing back washing on the filter B;

s16, adjusting the oil slurry feeding valve A to enable the filter A to run at full load; catalyst particles are intercepted on the outer surface of the filter element to form a filter cake, and the filtered liquid flows out through a filtered liquid pipeline 4;

the steps from S11 to S16 are repeated in a continuous cycle;

s2, regular cleaning:

after the filter A and the filter B continuously run on line for a certain time, opening oil slurry feeding valves and clear liquid filtering discharging valves of the other filters in a recycle oil soaking state to start filtering; and simultaneously closing the oil slurry feeding valve of the filter A and/or the filter B, performing back flushing on the filter A and/or the filter B, and performing regeneration cleaning on the filter A or the filter B.

Preferably, the backwashing of the filter a or the filter B in the step S12 or S15 specifically includes:

s30, closing the oil slurry feeding valve of the filter to interrupt feeding, and opening the recycle oil feeding valve of the filter, wherein the oil slurry in the filter is replaced by recycle oil serving as a backwashing medium;

s31, after the replacement is finished, closing a recycle oil feed valve and a clear liquid discharge valve of the filter, opening a back flush air inlet valve and a slag discharge valve of the filter, enabling the recycle oil to reversely flow through the filter element under the action of reverse pressure difference, and discharging filter cakes outside through the slag discharge valve;

s32, after the backwashing is finished, closing a backwashing air inlet valve of the filter and a deslagging valve at the bottom of the filter;

opening an oil slurry feeding valve and a clear liquid discharging valve of the filter to enter the next filtering period; or opening the recycle oil feeding valve of the filter, and closing the recycle oil feeding valve for standby after filling the filter.

Preferably, the specific steps of online cleaning the filter a and/or the filter B in the step S2 are as follows:

s40, closing an oil slurry feeding valve, a filtered liquid discharging valve and a recycle oil feeding valve of the filter;

s41, starting a cleaning solution circulating pump, a cleaning solution feed valve and a cleaning solution discharge valve corresponding to the filter, circularly cleaning the cleaning solution according to full load, and then closing the cleaning solution circulating pump, the cleaning solution feed valve and the cleaning solution discharge valve corresponding to the filter; sequentially opening a back-washing air inlet valve and a cleaning liquid discharge valve of the filter to reversely clean the filter;

s42, after reverse cleaning, closing a back-washing device air inlet valve and a cleaning liquid discharge valve of the filter, and re-opening a cleaning liquid circulating pump, a cleaning liquid inlet valve and a cleaning liquid discharge valve corresponding to the filter to enter the next cleaning period; and after the filter finishes a plurality of cleaning cycles, opening the corresponding recycle oil feeding valve to fill the recycle oil, closing the recycle oil feeding valve after the corresponding recycle oil feeding valve is filled with the recycle oil, and preserving heat for later use.

Preferably, in step S1, the filter pressure difference for backwashing the filter is set to 200 to 400 KPa; the set filtering time is 3-16 hours (the set filtering time is adjusted according to different solid contents in the raw materials, the on-line time is long when the solid contents are low, and the on-line time is short when the solid contents are high).

Preferably, in step S2, the frequency of the periodic cleaning is controlled to be (15 to 60 days)/time, and the number of cycle cycles per cleaning is 4 to 8 cycles.

Preferably, the temperature of the slurry oil filtration is controlled to be 260-300 ℃.

Preferably, the cleaning temperature of the cleaning liquid in the cleaning liquid buffer tank is controlled to be 270-290 ℃.

Preferably, the cleaning solution comprises the following components in volume fraction:

1-5% of 5, 8-dibromo-isoquinoline and 2-chloro-4-methylquinoline, and the balance of recycle oil;

and the volume ratio of the 5, 8-dibromo-isoquinoline to the 2-chloro-4-methylquinoline is 2: 1-1: 1.

The invention can bring the following beneficial effects:

(1) the invention adopts a pre-membrane step for the filter, and at the beginning of on-line filtration of the filter, the catalyst particles smaller than 1 mu m are enabled to approach Brownian motion on the surface of the filter element by controlling the filtration flux, and the catalyst particles are easier to be intercepted on the surface of the filter element, namely a layer of high-precision filter membrane is quickly formed on the surface of the filter element, the filtration precision is improved, and the pollution of the catalyst carried with asphalt to the filter element is reduced; moreover, a plurality of filters are arranged in parallel, and the back washing step ensures that the filters are regularly back washed on line, so that the back-washed filters recover certain processing capacity; however, after the filter element continuously runs for a certain period, the micro solid particles which are remained in the filter element and are not solidified are not removed from the filter element, are easy to adhere to the pore canal of the filter element, and can be solidified if untreated for a long time, so that the permanent blockage of the filter element is caused, which is also an important reason that the existing oil slurry filter device cannot run for a long period; therefore, the continuous filtration automatic operation of the filtration system is reliably guaranteed, and the continuous filtration automatic operation system is suitable for long-period operation.

(2) The invention utilizes the cleaning solution with special formula to circularly clean the filter which continuously runs for a long time, and after the asphaltene wrapped with pollution particles is dissolved, the tiny solid particles can be taken out of the filter element in the forward circulating cleaning and reverse cleaning processes, so that the tiny particles which possibly enter the filter element can be cleaned out of the filter element, the filter element is always kept to run under the low-net-pressure-difference state, and the continuous on-line service life of the filter device is prolonged.

(3) Through tests, the oil slurry purification effect of the invention is that the solid content of the filtered liquid is as follows: less than 30 ppm; average net pressure differential growth rate: less than 5 KPa/month.

In conclusion, the catalytic slurry oil purification device has excellent purification effect on catalytic slurry oil, reduces the net pressure difference increase rate of the filter element to about 1/3-1/7 of the conventional technology, greatly prolongs the filter life, and is suitable for long-period operation.

Drawings

FIG. 1 is a schematic diagram of the structure of a catalytic slurry oil filtering device suitable for long-term operation and a flow chart of the method.

Fig. 2 is a schematic structural view of the filter of the present invention.

The notations in the figures have the following meanings:

1-filter, 1 a-filter a, 1B-filter B, 1C-filter C, 10-housing, 11-cartridge, 12-tubesheet;

2-slurry feed, 20(a, b, c) -slurry feed valve (A, B, C), 21-heat exchanger, 22-bypass slurry valve, 200(a, b, c) flow meter;

3-recycle oil feed line, 30(a, b, c) -recycle oil feed valve (A, B, C);

4-filtered liquid delivery pipe, 40(a, b, c) -filtered liquid discharge valve (A, B, C);

5-backwash inlet pipe, 50(a, b, c) -backwash inlet valve (A, B, C);

6-slag discharge pipe, 60(a, b, c) -slag discharge valve (A, B, C);

7-a cleaning solution buffer tank, 70-a medium-pressure steam heating coil and 71-a steam valve;

8-cleaning liquid circulating pipeline, 80-cleaning liquid circulating pump, 81-cleaning liquid feeding valve, 82(a, b, c) -cleaning liquid discharging valve (A, B, C), 83-cleaning liquid discharging valve;

9-a control system;

23/72-remote thermometer.

Detailed Description

The technical solution of the present invention will be clearly and completely described below with reference to the specific embodiments. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.

Example 1

As shown in fig. 1, a catalytic slurry oil filtering device suitable for long-cycle operation comprises at least 3 filters 1, and for any one filter 1: the lower part of the oil slurry feeding pipe is provided with an oil slurry feeding pipe 2 and a recycle oil feeding pipe 3, and the upper part of the oil slurry feeding pipe is provided with a clear filtrate conveying pipe 4 and a back washing air inlet pipe 5; the bottom of any filter 1 is also connected with a slag discharge pipe 6;

a washing liquid buffer tank 7 is also included, and the bottom of the filter 1 is connected to the washing liquid buffer tank 7 through a washing liquid circulation pipe 8 with a washing liquid circulation pump 80, and is connected back to the top of the filter 1 through the washing liquid circulation pipe 8.

In the embodiment, a plurality of parallel filters 1 are arranged, so that a plurality of filters can be kept in a standby state and are kept to be cleaned and switched, and the reliability of the device is improved; specifically, the filter can be backwashed by arranging the backwashing air inlet pipe and discharged by the slag discharge pipe, so that a certain filtering capacity is recovered; and the cleaning solution buffer tank 7 and the cleaning solution circulating pipeline 8 are arranged, so that the filter 1 which runs for a long time can be cleaned periodically in an alternate off-line mode, particularly, impurities which are still difficult to discharge through filtering and back flushing in a filter element are dissolved and discharged, and the filtering capacity of the filter is recovered through deep regeneration. Therefore, the whole device can be kept in an online running state for a long period by alternate offline cleaning.

As a preferred embodiment, the lower part of any filter 1: is communicated with the slurry feeding pipe 2 through a slurry feeding valve 20; is communicated with a recycle oil feeding pipe 3 through a recycle oil feeding valve 30; is communicated with the slag discharge pipe 6 through a slag discharge valve 60;

a plurality of the filters 1 are connected in parallel and then communicated with a cleaning solution circulating pipeline 8 through a cleaning solution feeding valve 81, and the cleaning solution circulating pump 80 is arranged between the cleaning solution buffer tank 7 and the cleaning solution feeding valve 81; a cleaning liquid drain pipe having a cleaning liquid drain valve 83 is further provided between the cleaning liquid feed valve 81 and the cleaning liquid buffer tank 7 downstream in the cleaning liquid flow direction;

the upper part of any filter: is communicated with the filtered liquid delivery pipe 4 through a filtered liquid discharge valve 40; is communicated with the back washing air inlet pipe 5 through a back washing air inlet valve 50; and is communicated with the cleaning solution circulating pipeline 8 through a cleaning solution discharge valve 82.

In practical application, the lower part of the cleaning solution buffer tank 7 is connected with an inlet of a cleaning solution circulating pump 80 through a cleaning solution circulating pipeline 8, and an outlet of the cleaning solution circulating pump 80 is connected with an oil slurry inlet of the filter through a cleaning solution feeding valve and the cleaning solution circulating pipeline 8; the upper part of the cleaning liquid buffer tank 7 is connected with a filtered liquid outlet of the filter through a cleaning liquid circulating pipeline 8 and a cleaning liquid discharge valve 82, on one hand, the cleaning liquid in the cleaning liquid buffer tank 7 can be circularly introduced into the filter to carry out deep regeneration cleaning on the filter element through the matching of a cleaning liquid circulating pump 80, a cleaning liquid feed valve 81 and the cleaning liquid discharge valves 82 corresponding to the filters; on the other hand, through the cooperation of the backwashing air inlet valve 50 and the cleaning liquid discharge valve 83, the liquid with the dissolved asphaltene bound with the pollution particles can be discharged out of the filter, so that the off-line periodic cleaning of the filter can be realized, and the filtering capacity is recovered; the filters are alternately filtered on line and washed off line.

Preferably, the device also comprises a control system 9, wherein the control system 9 is electrically connected with the oil slurry feeding valve 20, the recycle oil feeding valve 30, the clear liquid filtering discharging valve 40, the back washing air inlet valve 50, the slag discharging valve 60, the cleaning liquid circulating pump 80, the cleaning liquid feeding valve 81, the cleaning liquid discharging valve 82 and the cleaning liquid discharging valve 83 respectively; as indicated by the dashed line in fig. 1, and the control system is a PLC control system or a DCS control system.

In the preferred embodiment, the control system can control all valves and pumps to realize the automatic treatment of feeding, air inlet and discharging, thereby improving the working efficiency. It should be noted that the control systems are all the prior art, and the PLC control system is a new-generation industrial control device formed by introducing a microelectronic technology, a computer technology, an automatic control technology and a communication technology on the basis of a conventional sequence controller, and aims to replace sequential control functions of a relay, execution logic, timing, counting and the like and establish a flexible remote control system. The DCS control system is a new generation instrument control system based on a microprocessor and adopting a design principle of decentralized control function, centralized display operation, and consideration of division, autonomy and comprehensive coordination. Specifically, the PLC control system can be Siemens S7-1200 or S7-1500 series PLC. The DCS control system may be selected from: zhejiang central control JX-300XP or ESC-700 system; the crossflow CENTUM VP or CENTUM CS system; a HONEYWELL PKS-C300 system. Because the control system is widely applied in engineering, the invention can also select other types of PLC or DCS control systems which can send instructions to control the corresponding opening and closing and adjustment of each valve and each pump through setting and adjusting programs so as to carry out the function of the corresponding working procedure.

More preferably, the bottom of washing liquid buffer tank is established to the toper, and in the cleaning process, the solid that the washing liquid was smugglied secretly deposits in the bottom of 7 awl bottoms of washing liquid buffer tank with asphaltene, and washing liquid circulating pump 80's entry sets up in the place of 800 ~ 1200mm on 7 awl bottoms of washing liquid buffer tank, and more preferably the selection is 1000mm, makes things convenient for the subsidence of solid catalyst particle impurity in the buffer tank.

As another preferred embodiment, as shown in fig. 2, the filter 1 includes a housing 10 and a filter cartridge 11 located in the middle of the housing 10, wherein the filter cartridge 11 is fixed to the inner wall of the housing 10 by a tube plate 12.

In practical application, the filter element 11 is a 316L stainless steel material film-coated filter element with the filtering precision of 0.3-0.5 μm; the thickness of the film layer is 200 to 400 μm. If the precision is higher than the range, the specific resistance of the filter element 11 is large, and the flux is small; if the accuracy is less than this range, the filtration accuracy is low, resulting in a high solid content of the filtrate.

Example 2

Referring to fig. 1, this embodiment is a method for filtering catalytic slurry oil suitable for long-cycle operation, which includes the following steps:

s1, in the plurality of filters 1, at least 2 filters continuously filter, and the rest filters are in a recycle oil soaking standby state:

s10, filtering by a filter A: opening an oil slurry feed valve A20 a and a clear filtrate discharge valve A40 a, enabling the oil slurry to enter a filter A1 a from the lower part of a filter A tube plate 12 through an oil slurry feed pipe 2, enabling the oil slurry to pass through a filter element from outside to inside, and intercepting catalyst particles on the outer surface of the filter element to form a filter cake; the clean oil slurry can pass through the filter cake, pass through the filter element and flow out of the filter to form a filtrate, and is discharged out through a filtrate pipeline 4;

wherein, the thickness of the filter cake can be increased along with the extension of the filtering time, and the flow of the filter A is kept constant by increasing the pressure difference of the filter A until the set filtering time is reached or the pressure difference of the filter reaches a set value;

s11, pre-membrane of filter B: when the filter A1 a reaches the set filtering time or reaches the set filtering pressure difference value, the oil slurry feeding valve B20B and the clear liquid filtering discharging valve B40B are opened, the filter A and the filter B simultaneously filter for 1 hour, oil slurry simultaneously enters the filter B1B from the oil slurry feeding pipe 2, the oil slurry treatment capacity of the filter B is controlled within the range of 1/4-1/2 of full load, a filtering membrane with extremely high precision is attached to the surface of the filter element of the filter B in the process, namely a pre-membrane is formed on the surface of the filter element of the filter B, and the filter element is prevented from penetrating and being polluted;

s12, backwashing of a filter A: closing an oil slurry feeding valve A20 a and a clear liquid discharging valve A40 a of the filter A1 a, and performing backwashing on the filter A;

s13, filtering by a filter B: adjusting the oil slurry feeding valve B20B to enable the filter B1B to filter at full load; catalyst particles are intercepted on the outer surface of the filter element to form a filter cake, and the filtered solution is discharged through a filtered solution pipeline 4;

wherein, the thickness of the filter cake can be increased along with the extension of the filtering time, and the flow of the filter B is kept constant by increasing the pressure difference of the filter B until the set filtering time is reached or the pressure difference of the filter reaches a set value;

s14, pre-membrane of filter a: when the filter B1B runs for a set time or a set pressure difference, the oil slurry feeding valve 20a and the clear liquid discharging valve A40 a of the filter A1 a are opened, the filter A after backwashing is restarted to filter, the filter A and the filter B simultaneously filter for 1 hour, and the oil slurry treatment capacity of the filter A is controlled within the range of 1/4-1/2 of full load, in the process, a filter membrane with extremely high precision is attached to the surface of the filter element of the filter A, and the pre-membrane of the filter A is finished;

s15, backwashing of a filter B: closing an oil slurry feeding valve B20B and a clear liquid discharging valve B40B of the filter B1B, and backwashing the filter B1B;

circularly repeating the steps S11-S16;

s2, regular cleaning:

after the filter A1 a and the filter B1B continuously run on line for a certain time, starting oil slurry feeding valves and clear liquid discharging valves of the other filters in the soaking state to start filtering; and simultaneously closing an oil slurry feeding valve and a clear liquid discharging valve of the filter A and/or the filter B, performing back flushing on the filter A and/or the filter B, and performing regeneration cleaning on the filter A and/or the filter B.

In the embodiment, a pre-membrane step of the filter is adopted, and at the beginning of on-line filtration of the filter, catalyst particles smaller than 1 mu m are enabled to approach Brownian motion on the surface of the filter element by controlling the filtration flux and to be easier to be intercepted on the surface of the filter element, namely a layer of high-precision filter membrane is quickly formed on the surface of the filter element, so that the filtration precision is improved, and the pollution of the filter element caused by the catalyst carrying with asphalt is reduced; moreover, a plurality of filters are arranged in parallel, and the back washing step ensures that the filters are regularly back washed on line, so that the back-washed filters recover certain processing capacity; however, after the filter element continuously runs for a certain period, the micro solid particles which are remained in the filter element and are not solidified are not removed from the filter element, are easy to adhere to the pore canal of the filter element, and can be solidified if untreated for a long time, so that the permanent blockage of the filter element is caused, which is also an important reason that the existing oil slurry filter device cannot run for a long period; therefore, the continuous filtration automatic operation of the filtration system is reliably guaranteed, and the continuous filtration automatic operation system is suitable for long-period operation. In addition, the purifying effect of this scheme of utilization to the oil slurry does, and the solid content of the serum that filters: less than 30 ppm; average net pressure differential growth rate: less than 5 KPa/month.

It should be noted that the filters a and B referred to in this embodiment may represent a single filter or a plurality of filters; the corresponding valves may control a single filter or may control multiple filters simultaneously.

Take a total of 3 filters as an example: opening oil slurry feed valves 20 of 2 filters in sequence, enabling the oil slurry to sequentially enter the 2 corresponding filters in parallel through an oil slurry feed pipe 2, and enabling filtered liquid to converge into a filtered liquid delivery pipe 4 and then be discharged out of the system by opening a corresponding filtered liquid discharge valve 40; the device adopts 2-start and 1-standby operation, under normal working conditions, 2 filters perform online filtration and alternate offline backwashing, and 1 filter is in a soaking standby state; the 3 filters are cleaned periodically off-line in turn, but the whole device and the whole process can be ensured to be in an on-line working condition continuously and reliably. When more filters are set, multiple filters can be adaptively adjusted to work in turn according to actual conditions, and detailed description is omitted here.

As a preferred embodiment, the backwashing in step S12 specifically includes:

s30, closing the oil slurry feed valve A20 a of the filter A1 a to interrupt feeding, opening the recycle oil feed valve A30a, and replacing the oil slurry in the filter with recycle oil serving as a backwashing medium;

s31, after the replacement is finished, closing a recycle oil feed valve A30a and a clear liquid discharge valve A40 a, opening a backwash air inlet valve A50 a, opening a slag discharge valve A60a at the bottom of the filter A, enabling the recycle oil to reversely flow through the filter element 11 under the action of set reverse pressure difference, and carrying filter cakes to be discharged through a slag discharge valve A60a at the bottom;

s32, after the backwashing is finished, closing a backwashing air inlet valve A50 a and a slag discharge valve A60a at the bottom of the filter A;

opening an oil slurry feeding valve A20 a and a filtered liquid discharging valve A40 a to enter the next filtering period; alternatively, the recycle oil feed valve a30a is opened and the recycle oil feed valve a30a is closed after filling for standby.

The backwashing in the step S15 includes the following steps:

s30, closing the oil slurry feed valve B20B of the filter B1B to interrupt feeding, and opening the recycle oil feed valve B30B, wherein the oil slurry in the filter is replaced by recycle oil serving as a back flushing medium;

s31, after the replacement is finished, closing a recycle oil feed valve B30B and a clear liquid discharge valve B40B, opening a backwash air inlet valve B50B, opening a slag discharge valve B60B at the bottom of a filter B, enabling the recycle oil to reversely flow through the filter element 11 under the action of set reverse pressure difference, and carrying filter cakes to be discharged through a slag discharge valve B60B at the bottom;

s32, after the backwashing is finished, closing a backwashing air inlet valve B50B and a slag discharge valve B60B at the bottom of the filter B;

opening an oil slurry feeding valve B20B and a filtered liquid discharging valve B40B to enter the next filtering period; alternatively, the recycle oil feed valve B30B is opened and the recycle oil feed valve B30B is closed after the completion of the filling for standby.

The specific steps of backwashing are provided in this embodiment, and the backwashing in step S2 is also substantially the same as the previous steps, and the contaminated oil in the filter is replaced with the recycled oil, and a backwashing gas intake and slag discharge process is combined, so that the contaminated oil slurry with impurities in the filter is discharged, and a certain filtering capacity is recovered, and thus the filtering and purifying treatment can be repeatedly performed.

As another preferred embodiment, the step of regenerating and cleaning the filter a and/or the filter B in step S2 is:

s40, closing the oil slurry feeding valve 20, the filtered liquid discharging valve 40 and the recycle oil feeding valve 30 of the filter (which can be the filter A or the filter B, and can also be the filter A and the filter B);

s41, opening a cleaning solution circulating pump 80, a cleaning solution feeding valve 81 and a cleaning solution discharging valve 82 corresponding to the filter, circularly cleaning the cleaning solution for 1-4 hours according to full load, then closing the cleaning solution feeding valve 81, the cleaning solution discharging valve 82 and the cleaning solution circulating pump 80 of the filter, sequentially opening a backwashing air inlet valve 50 and a cleaning solution discharging valve 83 of the filter 1, and reversely cleaning the filter 1;

s42, after reverse cleaning, closing the back washing air inlet valve A50 a and the cleaning liquid discharge valve 83; re-opening the cleaning solution feed valve 81, the cleaning solution discharge valve 82 and the cleaning solution circulating pump 80 of the filter 1 to enter the next cleaning period; after the filter 1 completes a certain cleaning period, the recycle oil feed valve corresponding to the filter is opened to fill the recycle oil, and after the recycle oil feed valve is filled with the recycle oil, the recycle oil feed valve 30 is closed, and the temperature is kept for standby.

The embodiment provides a specific step of regeneration cleaning, wherein a filter which continuously runs for a long time is circularly cleaned by using a cleaning solution, and after asphaltene wrapped with pollution particles is dissolved, tiny solid particles are taken out of a filter element in the forward circulating cleaning and reverse cleaning processes. In fact, hand valves are arranged before cleaning liquid enters each filter, and before the cleaning liquid feeding valve 81 is opened to clean the filters each time, the corresponding hand valves are manually opened. By periodic on-line regeneration cleaning, the fine solid particles which are remained in the filter element and are not solidified can be removed from the filter element, and the fine solid particles are remained in the filter element and are not carried out (in the processes of filtering and back flushing), and the main reason is that the fine solid particles are very small (less than 0.5 μm), are wrapped in heavy component asphaltene contained in the oil slurry, and due to the large viscosity of the asphaltene, impurities are easily adhered to the pore channels of the filter element (when the corresponding valve is closed in the step S40 when the cleaning is carried out by combining a control system, the on-line cleaning process is started, and when the filter 1 is cleaned for a certain period in the step S42, namely after the cleaning and the regeneration are finished, the on-line cleaning process is stopped by the control system 9). It should be noted that, depending on the number of filters to be set and the operation, the filter a and the filter B may be subjected to regeneration cleaning simultaneously or sequentially. The adjustment of the valve corresponding to the filter can be achieved by referring to the above-mentioned specific schemes, which are not described in detail herein.

Preferably, in step S2, the frequency of the periodic cleaning is controlled to be (15 to 60 days)/time, and the number of cycle cycles per cleaning: 4-8 cycles. Therefore, the net pressure difference increase rate of the filter element can be effectively ensured to be further reduced through a certain cleaning frequency. In order to improve the automation of the process operation, an automatic control technology (such as a PLC control system or a DCS control system) in the prior art can be combined, and a certain cleaning frequency is set in the control system.

In a preferred embodiment, in step S1, the filter is backwashed by controlling the start of the backwash air intake valve by setting the filtration pressure difference to 200 to 400KPa or setting the filtration time to 3 to 16 hours.

It should be noted that the filter is a conventional backwashing filter sold on the market, and is a common device in the prior art, and the filter comprises a differential pressure controller, an electric control device and other components, and backwashing can be started according to a certain program by setting an online filtration differential pressure or filtration time. Because of belonging to the prior art, the structure and principle thereof are not further described herein.

In another preferred embodiment, the temperature of the slurry oil filtration is controlled to be 260-300 ℃. The temperature control of the slurry oil is mainly realized by the bypass flow control of the heat exchanger, namely, the slurry oil with high temperature of about 350 ℃ from the upstream device enters the heat exchanger 21 to exchange heat with high-pressure water, the water is vaporized to generate 3.8MPa medium-pressure steam, simultaneously, the slurry oil is cooled, a telemetering thermometer 23 is arranged on an inlet pipeline (namely, a slurry oil pipeline at the outlet of the heat exchanger) of the slurry oil filtering device, a flow meter 200a/200b/200c is respectively arranged on a branch pipe at the slurry oil inlet of each filter, the telemetering thermometer 23 and the flow meter 200a/200b/200c are simultaneously and electrically connected with the control system 9, and the control system 9 controls the opening degree of a bypass slurry oil valve 22 in a feedback way through the received temperature signal, so that the temperature is maintained at a; if the temperature is too low, the viscosity is high, the resistance is high, and the asphaltene is easy to block the filter element; if the temperature is too high, coking is easy to occur, and a filter element is blocked. It should be noted that the aforementioned adjusting of the temperature range of the slurry oil by controlling the flow rate of the bypass of the heat exchanger (the bypass slurry oil valve 22 is arranged on the line of the heat exchanger to control the flow rate of the main line and the bypass of the heat exchanger so as to control the heat exchange temperature) is a common technical means in the prior art, and will not be further described herein.

Preferably, the cleaning temperature of the cleaning solution is controlled to be 270-290 ℃, the temperature of the cleaning solution is maintained by a medium-pressure steam heating coil 70 wound on the outer wall of the cleaning solution buffer tank, a telemetering thermometer 72 is arranged at the upper part of the cleaning solution buffer tank 7 and is electrically connected with the control system 9, and the control system 9 controls the opening of a steam valve 71 in a feedback manner through the received temperature signal of the buffer tank, so that the temperature is maintained at a set value. Preferably 290 c, to promote efficient cleaning of the asphaltenes binding the contaminating particles.

As another preferred embodiment, the cleaning solution comprises the following volume fraction composition: 1-5% of 5, 8-dibromo-isoquinoline and 2-chloro-4-methylquinoline, and the balance of recycle oil; and the volume ratio of the 5, 8-dibromo-isoquinoline to the 2-chloro-4-methylquinoline is 2: 1-1: 1.

In the embodiment, a cleaning solution with a special composition is adopted, 5, 8-dibromo-isoquinoline and 2-chloro-4-methylquinoline are compounded in recycle oil, the boiling point of the 5, 8-dibromo-isoquinoline is about 360 ℃, the boiling point of the 2-chloro-4-methylquinoline is about 295 ℃, the two substances are in liquid state during cleaning operation (at about 290 ℃), and the asphaltene dissolving capacity is very strong.

Application example 1

S1, filtering continuously in 2 filters among the 3 filters, soaking the rest 1 filter in cleaning solution for standby, wherein the filter element precision of the filter is 0.5 μm, and the film layer thickness is 400 μm:

s10, filtering by a filter A: starting an oil slurry feeding valve A20 a and a clear liquid filtering discharging valve A40 a, enabling raw material oil slurry to enter a filter A from the lower part of a tube plate 12 of the filter A through an oil slurry feeding pipe 2, enabling the oil slurry to penetrate through a filter element from outside to inside, and intercepting catalyst particles on the outer surface of the filter element to form a filter cake; the clean oil slurry can pass through the filter cake, pass through the filter element and flow out of the filter to form a filtrate, and is discharged out through a filtrate pipeline 4; wherein the parameters of the raw material oil slurry are as follows: solid content 5400 ppm; density 1067kg/m³(ii) a 4.6V% of asphaltene; particle size distribution d50 was 7.4 μm, particles smaller than 1 μm accounted for 7%, and filtration temperature of slurry: 280 plus or minus 10 ℃; the thickness of the filter cake can be increased along with the prolonging of the filtering time, the flow of the filter A is kept constant by increasing the pressure difference of the filter A until the set filtering time is reached or the highest filtering pressure difference reaches a set value of 250 KPa;

s11, pre-membrane of filter B: when the filter A1 a reaches the set filtering time or reaches the set filtering pressure difference value, the oil slurry feeding valve B20B and the clear liquid filtering discharging valve B40B are opened, the filter A and the filter B simultaneously filter for 1 hour, oil slurry simultaneously enters the filter B from the oil slurry feeding pipe 2, the oil slurry treatment capacity of the filter B is controlled to be 1/4 of full load, a filtering membrane with extremely high precision is attached to the surface of a filter element of the filter B in the process, namely a pre-membrane is formed on the surface of the filter element of the filter B, and the filter element is prevented from penetrating and being polluted;

s12, backwashing of a filter A: closing an oil slurry feeding valve A20 a and a clear liquid discharging valve A40 a of the filter A1 a, and performing backwashing;

the back washing steps are as follows:

s120, closing the oil slurry feed valve A20 a of the filter A1 a to interrupt feeding, and opening the recycle oil feed valve A30a, wherein the oil slurry in the filter is replaced by recycle oil serving as a backwashing medium;

s121, after the replacement is finished, closing a recycle oil feed valve A30a and a clear liquid discharge valve A40 a, opening a backwash air inlet valve A50 a, opening a slag discharge valve A60a at the bottom of a filter A, enabling the recycle oil to reversely flow through the filter element 11 under the action of set reverse pressure difference, and carrying filter cakes to be discharged through the slag discharge valve A60a at the bottom;

s122, after the backwashing is finished, closing a backwashing air inlet valve A50 a and a slag discharge valve A60a at the bottom of a filter A; opening a recycle oil feed valve A30a, and closing the recycle oil feed valve A30a for standby after the recycle oil feed valve A30a is full of the recycle oil;

s13, filtering by a filter B: adjusting the oil slurry feeding valve B20B to enable the filter B1B to filter at full load; catalyst particles are intercepted on the outer surface of the filter element to form a filter cake, and the filtered solution is discharged through a filtered solution pipeline 4; the filtering temperature of the oil slurry is 280 plus or minus 10 ℃; wherein, the thickness of the filter cake can be increased along with the prolonging of the filtering time, the flow of the filter B is kept constant by increasing the pressure difference of the filter B until the set filtering time is reached or the pressure difference of the filter reaches a set value of 250 KPa;

s14, pre-membrane of filter a: when the filter B1B runs for a set time or a set pressure difference, the oil slurry feed valve 20a and the clear liquid discharge valve A40 a of the filter A1 a are opened, the filter A after backwashing is restarted to filter, the filter A and the filter B simultaneously filter for 1 hour, and the oil slurry treatment capacity of the filter A is controlled to be 1/4 of full load, in the process, a filter membrane with extremely high precision is attached to the surface of the filter element of the filter A, namely, the pre-membrane of the filter A is finished;

the backwashing method comprises the following specific steps:

s150, closing the oil slurry feed valve B20B of the filter B1B to interrupt feeding, and opening the recycle oil feed valve B30B, wherein the oil slurry in the filter is replaced by recycle oil serving as a backwashing medium;

s151, after replacement is finished, closing a recycle oil feed valve B30B and a clear liquid discharge valve B40B, opening a backwash air inlet valve B50B, opening a slag discharge valve B60B at the bottom of a filter B, enabling the recycle oil to reversely flow through the filter element 11 under the action of set reverse pressure difference, and carrying filter cakes to be discharged through the slag discharge valve B60B at the bottom;

s152, after the backwashing is finished, closing a backwashing air inlet valve B50B and a slag discharge valve B60B at the bottom of the filter B; opening a recycle oil feed valve B30B, and closing the recycle oil feed valve B30B for standby after the recycle oil feed valve B30B is full of the recycle oil;

circularly repeating the steps S11-S16;

s2, regular cleaning:

after the filter A1 a and the filter B1B both continuously run on line for 30 days, starting an oil slurry feeding valve C20C and a clear liquid discharging valve C40C of the filter C in a soaking state, and starting filtration; and simultaneously closing the oil slurry feed valve A20 a and the clear liquid discharge valve A40 a of the filter A, backwashing the filter A1 a, and regenerating and cleaning the filter A1 a.

The regeneration cleaning method comprises the following specific steps:

s20, closing an oil slurry feed valve A20 a of a filter A1 a, closing a clear filtrate discharge valve A40 a and closing a recycle oil feed valve A30 a;

s21, cleaning solution in the cleaning solution buffer tank 7 comprises the following components: recycle oil 96V%, 5, 8-dibromo isoquinoline 2V%, 2-chloro-4-methyl quinoline 2V%; opening a cleaning solution circulating pump 80, a cleaning solution feeding valve 81 and a cleaning solution discharging valve 82A, circularly cleaning the cleaning solution for 1-4 hours according to full load, then closing the cleaning solution feeding valve 81, the cleaning solution discharging valve 82A and the cleaning solution circulating pump 80 of the filter, sequentially opening a backwashing air inlet valve A50 a and a cleaning solution discharging valve 83 of the filter A1 a, and reversely cleaning the filter A1 a;

s22, after reverse cleaning, closing the back washing air inlet valve A50 a and the cleaning liquid discharge valve 83; the cleaning solution circulating pump 80, the cleaning solution feeding valve 81 and the cleaning solution discharging valve 82A are restarted to enter the next cleaning period; and after the filter A finishes 5 cleaning cycles, opening the recycle oil feed valve A30a to fill the recycle oil, closing the recycle oil feed valve A30a after the recycle oil feed valve A is filled with the recycle oil, and preserving heat for later use.

The solid content of the filtrate in the application example is 20-30 ppm, and the net pressure difference growth rate is 3.9 KPa/month; if the net pressure difference is increased by 150KPa as the end of the life of the filter, the filter can be continuously on-line for 38 months.

Application example 2

This example is substantially the same as application example 1, except that:

in step S1, the parameters of the raw slurry oil are: solid content 4200 ppm; density 1107kg/m³(ii) a 6.5V% of asphaltene; the particle size distribution d50 is 7.3 μm, and the proportion of particles smaller than 1 μm is 7.1%; and the filtering temperature of the oil slurry is 290 +/-10 ℃;

in step S2, the cleaning solution comprises 95V% recycle oil, 3V% 5, 8-dibromo isoquinoline and 2V% 2-chloro-4-methyl quinoline; the number of cleaning cycle periods was: 8 cycles.

The solid content of the filtrate in the application example is 20-30 ppm, and the net pressure difference growth rate is 4.1 KPa/month; if the net pressure difference is increased by 150KPa as the end of the life of the filter, the filter can be continuously on-line for 36 months.

Application example 3

This example is substantially the same as application example 1, except that:

in step S1, the raw slurry oil is preparedThe parameters are as follows: solid content 3000 ppm; density 1032kg/m³(ii) a 1.98V% of asphaltene; the particle size distribution d50 is 9.3 μm, and the proportion of particles smaller than 1 μm is 7.9%; and the filtering temperature of the oil slurry is 260 ℃; set filtration maximum pressure difference: 200 KPa; 1/2 for controlling the oil slurry treatment capacity of the filter B and the filter A to be full load;

in step S2, the frequency of regular cleaning is 60 days/1 time; the number of cleaning cycle periods was: 4 periods.

The solid content of the filtrate in the application example is 20-25 ppm, and the net pressure difference growth rate is 3.5 KPa/month; if the net pressure difference is increased by 150KPa as the end of the life of the filter, the filter can be continuously on-line for 42 months.

Application example 4

This example is substantially the same as application example 3, except that:

in step S1, the filtering temperature of the oil slurry is 280 ℃;

the solid content of the filtrate in the application example is 20-30 ppm, and the net pressure difference growth rate is 3.0 KPa/month; if the net pressure difference is increased by 150KPa as the end of the life of the filter, the filter can be continuously on-line for 50 months.

Application example 5

This example is substantially the same as application example 3, except that:

in step S2, the frequency of regular cleaning is increased from 60 days/1 to 30 days/1;

the solid content of the filtrate in the application example is 20-30 ppm, and the net pressure difference growth rate is 3.1 KPa/month; if the net pressure difference is increased by 150KPa as the end of the life of the filter, the filter can be continuously on-line for 48 months.

Application example 6

This example is substantially the same as application example 1, except that:

in step S2, the frequency of regular cleaning is increased from 30 days/1 to 15 days/1;

the solid content of the filtrate in the application example is 20-30 ppm, and the net pressure difference growth rate is 3.2 KPa/month; if the net pressure difference is increased by 150KPa as the end of the life of the filter, the filter can be continuously on-line for 46 months.

Application example 7

This example is substantially the same as application example 1, except that:

the precision of the filter element of the filter is 0.3 μm, and the thickness of the membrane layer is 200 μm.

The solid content of the filtrate in the application example is less than 20ppm, and the net pressure difference growth rate is 4.2 KPa/month; if the net pressure difference is increased by 150KPa as the end of the life of the filter, the filter can be continuously on-line for 35 months.

Application example 8

This example is substantially the same as application example 3, except that:

the precision of the filter element is 0.3 μm, and the thickness of the film layer is 200 μm.

The solid content of the filtrate in the application example is less than 10ppm, and the net pressure difference growth rate is as follows: 3.2 KPa/month, if the filter life ends at a net pressure differential increase of 150KPa, it can continue online for 47 months.

Comparative example 1

This example is substantially the same as application example 1, except that:

there is no pre-filming step and no regular cleaning step.

Finally, the filtrate solids content: 50 to 100 ppm; net differential pressure growth rate: 13.3 KPa/month, if the end of filter life is reached at 150KPa increase in net pressure difference, it can continue online for 11 months.

Comparative example 2

This example is substantially the same as application example 2, except that:

there is no pre-filming step and no regular cleaning step.

The implementation effect is as follows:

finally, the filtrate solids content: 50 to 100 ppm; net differential pressure growth rate: 16.4 KPa/month, if the filter life ends at a net pressure differential increase of 150KPa, it can be continuously online for 9 months.

Comparative example 3

This example is substantially the same as application example 3, except that:

there is no pre-filming step and no regular cleaning step.

Finally, the filtrate solids content: 50 to 100 ppm; net differential pressure growth rate: 12.4 KPa/month, if the filter life ends at a net pressure differential increase of 150KPa, it can continue online for 12 months.

Comparative example 4

This example is substantially the same as application example 7, except that:

there is no pre-filming step and no regular cleaning step.

Finally, the solid content of the filtered liquid is 30-50 ppm; net differential pressure growth rate: 25 KPa/month, if the filter life ends at a net pressure differential increase of 150KPa, it can be continuously online for 6 months.

Through the test results of the comparative examples 1 to 4, the scheme of the invention has excellent purification effect on catalytic slurry oil, and the net pressure difference increase rate of the filter element is reduced to about 1/3 to 1/7 of the conventional technology, so that the filter life is greatly prolonged, and the filter is suitable for long-period operation.

Comparative example 5

This example is substantially the same as application example 7, except that:

no pre-filming step is performed.

Finally, the filtrate solids content: 30-50 ppm; net differential pressure growth rate: 9.3 KPa/month, it could be continuously online for 16 months if the filter life ends at a net pressure differential increase of 150 KPa.

Comparative example 6

This example is substantially the same as application example 7, except that:

there is no regular cleaning step.

Finally, the filtrate solids content: less than 20 ppm; net differential pressure growth rate: 19 KPa/month, if the filter life ends at a net pressure differential increase of 150KPa, it can continue online for 7.8 months.

Comparative example 7

This example is substantially the same as application example 3, except that:

2/3 for controlling the oil slurry treatment capacity of the filter B and the filter A to be full load;

The solid content of the filtrate in the application example is 30-50 ppm, and the net pressure difference growth rate is 6.7 KPa/month; if the net pressure difference is increased by 150KPa as the end of the life of the filter, the filter can be continuously on-line for 22 months.

The result shows that the treatment capacity of the slurry oil exceeds a certain load, so that Brownian movement of catalyst particles on the surface of the filter element is not facilitated, the formation of a pre-membrane is influenced, and the catalyst is polluted by the filter element due to entrainment of asphaltene.

Comparative example 8

This example is substantially the same as application example 1, except that:

1/5 for controlling the oil slurry treatment capacity of the filter B and the filter A to be full load;

It is shown that too low a process flow does not result in a more precise pre-membrane and does not result in more improvement in filtration accuracy and lifetime.

Comparative example 9

This example is substantially the same as application example 3, except that:

the cleaning solution comprises the following components: 98V percent of recycle oil and 2V percent of 5, 8-dibromo isoquinoline.

The solid content of the filtrate in the application example is 20-25 ppm, and the net pressure difference growth rate is 5.3 KPa/month; if the net pressure difference is increased by 150KPa as the end of the life of the filter, the filter can be continuously on-line for 28 months.

Comparative example 10

This example is substantially the same as application example 3, except that:

the cleaning solution comprises the following components: 95V% of recycle oil and 5V% of 2-chloro-4-methylquinoline.

The solid content of the final filtrate of the application example is 20-25 ppm, and the net pressure difference growth rate is 4.7 KPa/month; if the net pressure difference is increased by 150KPa as the end of the life of the filter, the filter can be continuously on-line for 32 months.

Comparative example 11

This example is substantially the same as application example 3, except that:

the cleaning solution comprises the following components: recycle oil 94V%, 5, 8-dibromo isoquinoline 2V%, 2-chloro-4-methyl quinoline 4V%.

The solid content of the final filtrate of the application example is 20-25 ppm, and the net pressure difference growth rate is 4.8 KPa/month; if the net pressure difference is increased by 150KPa as the end of the life of the filter, the filter can be continuously on-line for 31 months.

It should be noted that the above embodiments can be freely combined as necessary. The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.

Claims

1. A catalytic slurry oil filter device suitable for long-period operation is characterized in that:

comprises at least 3 filters; for either filter: the lower part of the filter is provided with an oil slurry feeding pipe and a recycle oil feeding pipe, and the upper part of the filter is provided with a clear liquid conveying pipeline and a back washing air inlet pipe; the bottom of any filter is also connected with a slag discharge pipe;

2. The catalytic slurry filter unit adapted for long cycle operation of claim 1, wherein:

the lower part of any filter: is communicated with an oil slurry feeding pipe through an oil slurry feeding valve; is communicated with a recycle oil feeding pipe through a recycle oil feeding valve; is communicated with a slag discharge pipe through a slag discharge valve;

the upper part of any filter: the clear liquid discharge valve is communicated with a clear liquid filtering conveying pipe; is communicated with the back washing air inlet pipe through a back washing air inlet valve; is communicated with a cleaning solution circulating pipeline through a cleaning solution discharge valve.

3. The catalytic slurry filter unit adapted for long cycle operation of claim 2, wherein:

the device also comprises a control system, wherein the control system is electrically connected with the oil slurry feed valve, the recycle oil feed valve, the clear liquid filtering discharge valve, the back washing air inlet valve, the slag discharge valve, the cleaning liquid feed valve, the cleaning liquid circulating pump, the cleaning liquid discharge valve and the cleaning liquid discharge valve respectively;

the control system is a PLC control system or a DCS control system.

4. The catalytic slurry filter unit adapted for long cycle operation of claim 1, wherein:

the bottom of the cleaning solution buffer tank is designed to be conical, and an inlet of the cleaning solution circulating pump is arranged at a position, 800-1200 mm away from the upper portion of the conical bottom, of the cleaning solution buffer tank.

5. The catalytic slurry filter unit adapted for long cycle operation of claim 1, wherein:

the filter comprises a shell and a filter element positioned in the middle of the shell, and the filter element is fixed on the inner wall of the shell through a tube plate.

6. A catalytic slurry oil filtration method suitable for long-cycle operation, comprising the steps of:

the steps from S11 to S16 are repeated in a continuous cycle;

s2, regular cleaning:

after the filter A and the filter B continuously run on line for a certain time, opening oil slurry feeding valves and clear liquid discharging valves of the other filters in a soaking state, and starting filtering; and simultaneously closing the oil slurry feeding valve of the filter A and/or the filter B, performing back flushing on the filter A and/or the filter B, and performing regeneration cleaning on the filter A or the filter B.

7. The method of claim 6, wherein the step of backwashing the filter A or the filter B in the step S12 or S15 comprises the following steps:

8. The method for filtering catalytic slurry oil suitable for long-term operation according to claim 6, wherein the specific steps of cleaning the filter A and/or the filter B in the step S2 in an online manner are as follows:

9. The method of claim 6 for filtering a catalytic slurry oil suitable for long-cycle operation, wherein:

in step S1, setting the filtering pressure difference of 200-400 KPa or the filtering time of 3-16 hours for back flushing the filter; and/or the presence of a gas in the gas,

in step S2, the frequency of the periodic cleaning is controlled to be (15-60 days)/time, and the number of cycle cycles of each cleaning is 4-8 cycles; and/or the presence of a gas in the gas,

the temperature of the oil slurry filtration is controlled to be 260-300 ℃; and/or the presence of a gas in the gas,

and controlling the cleaning temperature of the cleaning liquid in the cleaning liquid buffer tank to be 270-290 ℃.

10. The method of claim 6 wherein the cleaning fluid comprises the following volume fraction composition: