阅读说明：本技术 一种适于长周期运行的催化油浆过滤装置和方法 (Catalytic slurry oil filtering device and method suitable for long-period operation ) 是由 马洪玺 朱洪 李雷 张文军 陈长祥 于 2019-10-31 设计创作，主要内容包括：本发明公开了一种适于长周期运行的催化油浆过滤装置；包括至少3台过滤器；对于任一过滤器：其下部均设置油浆进料管、回炼油进料管,其上部均设置滤清液输送管道、反冲洗进气管；任一过滤器的底部还连接排渣管；还包括一清洗液缓冲罐；任一过滤器的底部均通过带清洗液循环泵的清洗液循环管道连接至所述清洗液缓冲罐、并通过清洗液循环管道回连至过滤器的顶部。该装置操作简便、适合长周期连续运行的催化油浆过滤装置。同时提供了相应的过滤方法,结合预膜及再生清洗工序,不仅工艺简单,操作方便,而且将滤芯的净压差增长速度降低到现有常规技术的1/3～1/7左右,从而延长油浆过滤装置的连续运行周期,达到油浆过滤装置长周期高精度运行的目的。(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.)

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;

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.

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 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: 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:

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 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:

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.

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:

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.

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:

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.

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.

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.