CN108359491B - Catalytic cracking slurry oil solid removing system and method - Google Patents
Catalytic cracking slurry oil solid removing system and method Download PDFInfo
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- CN108359491B CN108359491B CN201810387577.0A CN201810387577A CN108359491B CN 108359491 B CN108359491 B CN 108359491B CN 201810387577 A CN201810387577 A CN 201810387577A CN 108359491 B CN108359491 B CN 108359491B
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10G—CRACKING HYDROCARBON OILS; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVE HYDROGENATION, OLIGOMERISATION, POLYMERISATION; RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, OR GASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; MINERAL WAXES
- C10G32/00—Refining of hydrocarbon oils by electric or magnetic means, by irradiation, or by using microorganisms
- C10G32/02—Refining of hydrocarbon oils by electric or magnetic means, by irradiation, or by using microorganisms by electric or magnetic means
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Abstract
The invention provides a catalytic cracking slurry oil stripping and fixing system and a stripping and fixing method thereof. The invention comprises a raw material slurry storage tank, a high-voltage electrostatic separation device and a purified slurry storage tank, wherein the raw material slurry storage tank is connected with the high-voltage electrostatic separation device through a purification pipeline and a back flush pipeline respectively, and the high-voltage electrostatic separation device is also connected with the purified slurry storage tank through the purification pipeline and the back flush pipeline respectively; the high-voltage electrostatic separation device comprises a shell, wherein the shell is a peripheral copper electrode, a central copper electrode is arranged in the shell, a spoiler is arranged between the central copper electrode and the shell, and the central copper electrode is connected with a high-voltage electrostatic generator. The high-voltage electrostatic separation device forms an electric field with non-uniform distribution between the central copper electrode and the shell, and the flow field inside the spoiler is non-uniform in distribution, so that the adsorption of particles is facilitated, the separation efficiency is improved, and the solid removal effect is good; no filler is used in the back washing device, so that the blocking phenomenon is avoided, the back washing is quicker, and the time is saved.
Description
Technical Field
The invention relates to the technical field of catalytic cracking slurry oil decubitus, in particular to a catalytic cracking slurry oil decubitus system and a decubitus method thereof.
Background
In recent years, the quality of crude oil output is reduced year by year, and the heavy and poor quality of raw materials of a catalytic cracking device are gradually increased. At present, the annual output of domestic catalytic cracking slurry oil (FCCS) reaches 7.5Mt, the FCCS is an important chemical raw material for producing rubber filling oil, needle coke, asphalt and carbon fiber, but the catalytic cracking slurry oil usually contains a certain amount of solid particles, the concentration of the solid particles is usually about 1000-3500ppm, and the solid particles mainly comprise catalyst fine powder and a certain amount of coke powder, so that the utilization range of the slurry oil is seriously influenced. For example, carbon black or rubber filler may be produced when the solid content in FCCS is 500ppm or less, needle coke may be produced when the solid content in FCCS is 100ppm or less, and carbon fiber may be produced when the solid content in FCCS is 10-20 ppm. Therefore, the de-solidification treatment of the FCCS is a necessary premise for realizing the comprehensive utilization of the FCCS.
The existing catalytic cracking slurry oil solid removing system generally adopts a combined system of reduced pressure distillation and extraction, and the method adopts a combined process of extraction, reduced pressure distillation and extraction to purify the slurry oil and produce needle coke and other chemical raw materials. The asphalt and partial catalyst are removed from the slurry oil by a reduced pressure distillation device, and aromatic components are extracted for producing needle coke and other chemical raw materials. The solid content of the chemical raw materials such as needle coke processed by the slurry refining system is unstable, which can affect the quality indexes such as the strength of products such as needle coke in the subsequent system, and the unqualified raw materials can only be reworked or degraded to be processed as the raw materials of common products; in addition, the electrostatic solid-liquid separator used in the solid removing system has more influencing factors, and the solid removing system has poor running stability and is not easy to regulate and control; in addition, because a large amount of small-particle-size filler is used in the electrostatic solid-liquid separator, the difficulty of back flushing and maintenance is increased due to the arrangement of the filler, so that the electrostatic solid-liquid separator is not easy to flush and regenerate, and has the advantages of large equipment investment, complex flow and high operation cost.
Disclosure of Invention
The invention provides a catalytic cracking slurry oil stripping and fixing system and a stripping and fixing method thereof, which solve the problems of poor operation stability, difficult flushing and regeneration and high operation cost of the stripping and fixing system in the prior art.
The invention relates to a catalytic cracking slurry oil stripping and fixing system, which is realized by the following technical scheme: the device comprises a raw material slurry storage tank, a high-voltage electrostatic separation device and a purified slurry storage tank, wherein the raw material slurry storage tank is connected with the high-voltage electrostatic separation device through a purification pipeline, and the high-voltage electrostatic separation device is also connected with the purified slurry storage tank through the purification pipeline; the purifying slurry oil storage tank is also connected with the high-voltage electrostatic separation device through a back flush pipeline, and the high-voltage electrostatic separation device is also connected with the raw material slurry oil storage tank through a back flush pipeline; the high-voltage electrostatic separation device comprises a shell, wherein the shell is a peripheral copper electrode, a central copper electrode coaxially arranged is arranged in the shell, a spoiler is arranged between the central copper electrode and the shell, the central copper electrode is connected with a high-voltage electrostatic generator, and an oil slurry inlet, an oil slurry outlet, a backwash liquid inlet and a backwash liquid outlet are respectively arranged on the shell.
The raw material slurry oil storage tank is sequentially connected with the high-voltage electrostatic separation device and the purified slurry oil storage tank through the purification pipeline, catalytic cracking slurry oil in the raw material slurry oil storage tank flows through the purification pipeline to enter the high-voltage electrostatic separation device for solid removal and purification, and the catalytic cracking slurry oil after solid removal and purification enters the purified slurry oil storage tank for storage through the purification pipeline; the purified slurry oil storage tank is also connected with the high-voltage electrostatic separation device and the raw slurry oil storage tank in sequence through a back flushing pipeline, when the high-voltage electrostatic separation device needs to be cleaned, the purified catalytic cracking slurry oil stored in the purified slurry oil storage tank enters the high-voltage electrostatic separation device through the back flushing pipeline to be back flushed, and the catalytic cracking slurry oil after flushing the high-voltage electrostatic separation device enters the raw slurry oil storage tank through the back flushing pipeline to be subjected to solid removal and purification treatment again; the catalytic cracking slurry stripping and fixing system is a complete and tightly connected system, is easy to control and convenient to operate, and the high-voltage electrostatic separation device forms an electric field between the central copper electrode and the shell, so that the flow field inside the catalytic cracking slurry stripping and fixing system is unevenly distributed under the action of the spoiler, thereby being beneficial to the adsorption of particles and having good stripping and fixing effect; the inside of the high-voltage electrostatic separation device is not filled with filler, so that the blocking phenomenon is avoided, the back flushing is quicker, the time is saved, the overhaul is convenient, and the maintenance is easy.
As a preferred embodiment, the spoiler comprises a plurality of first spoilers arranged on the central copper electrode at intervals and a plurality of second spoilers arranged inside the shell at intervals, and the first spoilers and the second spoilers are arranged in an staggered manner. The first spoiler and the second spoiler which are arranged in a staggered way increase the resistance of the catalytic cracking slurry oil flowing in the high-voltage electrostatic separation device, prolong the separation time of solid particles and slurry oil, and improve the separation efficiency of the solid particles.
As a preferred embodiment, the central copper electrode is arranged in a polygonal prism shape, and the inner surface of the housing is also arranged in a polygonal prism shape. The shapes of the central copper electrode and the shell can be set according to actual needs, the central copper electrode is of a solid structure, the shell is of a structure with a cavity inside, and the outer surface of the shell is of a cylinder shape under normal conditions, so that the whole appearance and the attractive appearance of the shell are facilitated; the inner surface of the housing is arranged according to actual needs.
As a preferred embodiment, the central copper electrode and the inner surface of the housing are each provided in the shape of a regular hexagonal prism. The regular hexagonal prism-shaped central copper electrode and the shell with the inner surface being regular hexagonal prism-shaped are not uniform in electric field intensity distribution, and are favorable for solid particle adsorption.
As a preferred embodiment, the angle between the top angle of the central copper electrode and the top angle of the inner surface of the housing closest thereto is 25-35 degrees. The central copper electrode and the shell are arranged coaxially in a staggered manner, so that the electric field distribution non-uniformity between the central copper electrode and the shell is increased, the adsorption position of particles is increased, and the separation efficiency is improved.
As a preferred embodiment, both the top corners of the central copper electrode and the top corners of the inner surface of the housing are rounded. The center copper electrode arranged by the round corners and the inner surface of the shell avoid the phenomenon of point discharge caused by over sharp top angles, so that the high-voltage electrostatic separation device operates stably and has stable solid removing performance.
As a preferred embodiment, the first spoiler is arranged in a regular hexagonal prism shape, the second spoiler is also arranged in a regular hexagonal prism shape, the vertex angles of the first spoiler are respectively corresponding to the vertex angles of the central copper electrode, and the vertex angles of the second spoiler are respectively corresponding to the vertex angles of the central copper electrode. The high-voltage electrostatic separation device has uniform electric field intensity distribution in the longitudinal direction and nonuniform electric field intensity in the transverse direction, and the arrangement of the spoiler increases the time for the fluid in the high-voltage electrostatic separation device to flow longitudinally, so that the adsorption of solid particles is facilitated, and the separation efficiency is increased.
As a preferred embodiment, a control valve is arranged on the backwash liquid outlet, the backwash liquid outlet comprises a lower outlet, a middle outlet and an upper outlet, and the control valve is connected with a controller. The high-voltage electrostatic separation device has the function of multistage back flushing, reduces the possibility of catalyst particle residue in the device after the flushing is finished, and improves the back flushing effect.
As a preferred implementation scheme, the high-voltage electrostatic separation device is divided into two sets, and the two sets of high-voltage electrostatic separation devices are arranged in parallel. The catalytic cracking slurry oil solid removing system adopts two non-filler high-voltage electrostatic separating devices which are connected in parallel, when one of the electrostatic separating devices works, the other electrostatic separating device performs back flushing, the whole solid removing system realizes continuous operation, and the solid removing efficiency is improved.
The invention relates to a catalytic cracking slurry oil decubitus method, which is realized by the following steps: the slurry oil removal treatment on the catalytic cracking slurry oil removal system according to any one of the above, comprising the following steps: 1) The catalytic cracking slurry oil enters a high-voltage electrostatic separation device from a raw slurry oil storage tank through a purification pipeline, the flow rate of the catalytic cracking slurry oil entering the high-voltage electrostatic separation device is 100-500mL/min, the voltage of a high-voltage electrostatic separator in the high-voltage electrostatic separation device is 15-30KV, and the catalytic cracking slurry oil after the solid removal treatment in the high-voltage electrostatic separation device enters a purified slurry oil storage tank through a purification pipeline for storage; 2) When the high-voltage electrostatic separation device needs to be flushed, the purified catalytic cracking slurry in the purified slurry oil storage tank enters the high-voltage electrostatic separation device through a back flushing pipeline, the back flushing flow of the purified catalytic cracking slurry oil is 1-1.5L/min, the back flushing is performed on the high-voltage electrostatic separation device along the direction opposite to the solid removal and purification direction of the catalytic cracking slurry oil, the back flushing time is 30-60min, and the catalytic cracking slurry oil after back flushing the high-voltage electrostatic separation device enters the raw slurry oil storage tank through the back flushing pipeline for further purification and solid removal treatment.
The catalytic cracking slurry oil solid removing method realizes solid removing and purifying of the catalytic cracking slurry oil and back flushing of the high-voltage electrostatic separating devices, one of the high-voltage electrostatic separating devices is in a solid removing and purifying state, the other high-voltage electrostatic separating device is in a back flushing state, and the whole solid removing system runs continuously, so that the solid removing efficiency is improved; the catalytic cracking slurry oil solid removing method is convenient to control, mild in condition and easy to realize industrialization.
Compared with the prior art, the invention has the beneficial effects that: the catalytic cracking slurry oil solid removing system is a complete and compact continuous operation system, one of the high-voltage electrostatic separating devices is in a solid removing and purifying state, and the other high-voltage electrostatic separating device is in a back flushing state, so that continuous operation is realized, the control is easy, and the operation is convenient; the high-voltage electrostatic separation device forms an electric field with non-uniform distribution between the central copper electrode and the shell, and under the action of the spoiler, the flow field inside the high-voltage electrostatic separation device is non-uniform in distribution, so that the adsorption of particles is facilitated, the separation efficiency is improved, and the solid removal effect is good; the inside of the high-voltage electrostatic separation device is not filled, so that the blocking phenomenon is avoided, the back flushing is more rapid, complex parts such as a filler inlet, a filler pressing plate and a filler supporting plate are reduced, the high-voltage electrostatic separation device is convenient to detach and easy to maintain, and meanwhile, the production cost is reduced.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic plan view of an embodiment of the present invention;
FIG. 2 is a schematic cross-sectional view of the high-voltage electrostatic separation device of FIG. 1;
FIG. 3 is a schematic top view of the structure of FIG. 2 at A-A;
FIG. 4 is a schematic view of a connection structure between the central copper electrode and the first spoiler in FIG. 2;
FIG. 5 is a schematic top view of FIG. 4;
FIG. 6 is a schematic view of a connection structure between the outer casing and the second spoiler in FIG. 2;
FIG. 7 is a schematic top view of FIG. 6;
FIG. 8 is a schematic cross-sectional perspective connection of the housing and the central copper electrode of FIG. 2;
FIG. 9 is a schematic view of the front plan view structure of FIG. 8;
fig. 10 is a schematic diagram showing the distribution of catalyst particles in the high-voltage electrostatic separation device at time t=0;
fig. 11 is a schematic diagram of the movement trace of the catalyst particles in the high-voltage electrostatic separation device at time t=10 min;
fig. 12 is a schematic diagram of the movement trace of the catalyst particles in the high-voltage electrostatic separation device at time t=20 min;
fig. 13 is a schematic diagram of a motion trace of catalyst particles in the high-voltage electrostatic separation device at time t=40 min;
in the figure: a, a raw material slurry storage tank; b-a first high-voltage electrostatic separation device; c-a second high-voltage electrostatic separation device; d-purifying the slurry oil storage tank; 1-a first valve; 2-a second valve; 3-a third valve; 4-fourth valve; 5-a fifth valve; 6-sixth valve; 7-seventh valve; 8-eighth valve; 9-ninth valve; 10-tenth valve; 11-eleventh valve; 12-twelfth valve; 13-thirteenth valve; 14-fourteenth valve; 15-fifteenth valve; 16-sixteenth valve;
21-slurry inlet; 22-a first backwash liquid outlet; 24-a central copper electrode; 25-a housing; 261-a first spoiler; 262-a second spoiler; 27-slurry outlet; 28-backwash liquid inlet; 29-a high voltage electrostatic generator; 30-a first control valve; 31-a second control valve; 32-a third control valve; 33-fourth control valve; 34-a fifth control valve; 35-sixth control valve; 36-a second backwash liquid outlet; 37-third reactant outlet.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1 to 9, the catalytic cracking slurry oil removing system comprises a raw slurry oil storage tank A, a high-voltage electrostatic separation device and a purified slurry oil storage tank D, wherein the raw slurry oil storage tank A is connected with the high-voltage electrostatic separation device through a purifying pipeline, and the high-voltage electrostatic separation device is also connected with the purified slurry oil storage tank D through the purifying pipeline; the purified oil slurry storage tank D is also connected with a high-voltage electrostatic separation device through a back flush pipeline, and the high-voltage electrostatic separation device is also connected with the raw oil slurry storage tank A through a back flush pipeline; in this embodiment, the high-voltage electrostatic separation devices are two sets, that is, the first high-voltage electrostatic separation device B and the second high-voltage electrostatic separation device C, and the two sets of high-voltage electrostatic separation devices are arranged in parallel. The high-voltage electrostatic separation device comprises a shell 25, wherein the shell 25 is a peripheral copper electrode, a central copper electrode 24 is arranged in the shell 25, a spoiler is arranged between the central copper electrode 24 and the shell 25, the central copper electrode 24 is connected with a high-voltage electrostatic generator 29, and an oil slurry inlet 21, an oil slurry outlet 27, a backwash liquid inlet 28 and a backwash liquid outlet are respectively arranged on the shell 25. In this embodiment, slurry inlet 21 is located at the top of housing 25, slurry outlet 27 is located at the bottom of housing 25, backwash liquid inlet 28 is located at the bottom of housing 25 and backwash liquid outlet is located at the upper portion of housing 25. The catalytic cracking slurry oil solid removing system is a complete and compact continuous operation system, when the first high-voltage electrostatic separation device B is in a solid removing and purifying state, the second high-voltage electrostatic separation device C can be in a back flushing state, continuous operation is realized, and the control is easy and the operation is convenient; the high-voltage electrostatic separation device generates an electric field between the central copper electrode 24 and the shell 25, and under the action of the spoiler, the flow field inside the high-voltage electrostatic separation device is unevenly distributed, thereby being beneficial to the adsorption of particles, improving the separation efficiency and having good solid removal effect; the inside of the high-voltage electrostatic separation device is not filled, so that the blocking phenomenon is avoided, the back flushing is more rapid, complex parts such as a filler inlet, a filler pressing plate and a filler supporting plate are reduced, the high-voltage electrostatic separation device is convenient to detach and easy to maintain, and meanwhile, the production cost is reduced.
Referring to fig. 2, 3, 4, 5, 6, 7, 8 and 9, in the present invention, the spoiler includes a plurality of first spoilers 261 spaced on the central copper electrode 24 and a plurality of second spoilers 262 spaced inside the housing 25, and the first spoilers 261 and the second spoilers 262 are disposed in a staggered manner. The staggered first spoiler 261 and the staggered second spoiler 262 increase the resistance of the catalytic cracking slurry oil flowing in the high-voltage electrostatic separation device, prolong the separation time of solid particles and slurry oil, and improve the separation efficiency of the solid particles. The central copper electrode 24 is arranged in a polygonal prism shape, and the inner surface of the housing 25 is also arranged in a polygonal prism shape. In this embodiment, the inner surfaces of the central copper electrode 24 and the housing 25 are each provided in a regular hexagonal prism shape. The regular hexagonal prism-shaped central copper electrode 24 and the outer shell 25 with the inner surface being regular hexagonal prisms are used for enabling the electric field intensity between the regular hexagonal prisms to be unevenly distributed, so that the adsorption of solid particles is facilitated, and the separation effect is further improved. Typically, the angle between the top angle of the central copper electrode 24 and the top angle of the inner surface of the nearest housing 25 is 25-35 degrees, preferably the angle between the top angle of the central copper electrode 24 and the top angle of the inner surface of the nearest housing 25 is 30 degrees. The central copper electrode 24 and the outer shell 25 are arranged coaxially and alternately, and the arrangement not only increases the non-uniformity of electric field distribution among the central copper electrode and the outer shell, but also increases the adsorption position of particles and improves the separation efficiency. In addition, the corners of the center copper electrode 24 and the inner surface of the outer can 25 are rounded. The rounded corners are arranged on the inner surfaces of the central copper electrode 24 and the outer shell 25, so that the phenomenon of point discharge caused by over sharp top angles is avoided, the high-voltage electrostatic separation device operates stably, and the stripping performance is stable.
Referring to fig. 3, fig. 4, fig. 5, fig. 6, fig. 7, fig. 8 and fig. 9, in this embodiment, the first spoiler 261 is in a regular hexagonal prism type arrangement, the second spoiler 262 is also in a regular hexagonal prism type arrangement, the top angles of the first spoiler 261 are respectively corresponding to and consistent with the top angles of the central copper electrode 24, and the top angles of the second spoiler 262 are respectively corresponding to and consistent with the top angles of the central copper electrode 24. The high-voltage electrostatic separation device has the advantages that the electric field intensity distribution is uniform in the longitudinal direction and the electric field intensity is nonuniform in the transverse direction, the time for the fluid in the high-voltage electrostatic separation device to flow longitudinally is increased due to the arrangement of the spoiler, the adsorption of solid particles is facilitated, and the separation efficiency is increased; the first spoiler 261 and the second spoiler 262 are insulating plates made of insulating material.
Referring to fig. 2, the back flushing liquid outlet of the present invention is provided with a control valve, the back flushing liquid outlet includes a lower outlet, i.e. a third back flushing liquid outlet 37, a middle outlet, i.e. a second back flushing liquid outlet 36, and an upper outlet, i.e. a first back flushing liquid outlet 22, the third back flushing liquid outlet 37 is provided with a sixth control valve 35, the second back flushing liquid outlet 36 is provided with a fifth control valve 34, the first back flushing liquid outlet 22 is provided with a second control valve 31, in addition, the slurry inlet 21 is provided with a first control valve 30, the back flushing liquid inlet 28 is provided with a third control valve 32, the slurry outlet 27 is provided with a fourth control valve 33, the control valves are connected with a controller, and all the control valves are connected with the controller, so that the controller can automatically control the solid removal, purification and back flushing of the high-voltage electrostatic separation device, thereby making the control more convenient. The high-voltage electrostatic separation device has the function of multistage back flushing, reduces the possibility of catalyst particle residue in the device after the flushing is finished, and improves the back flushing effect.
In order to verify the feasibility of the catalytic cracking slurry oil stripping system, a geometric model of the stripping system is imported into CFD software for simulation calculation, wherein the side length of a hexagon of the central copper electrode 24 is 70mm, the central angle of a rounding angle is 120 degrees, and the radius of the rounding angle is 10mm; a first spoiler 261 on the central copper electrode 24, the hexagonal side length of which is 85mm; the radius of the hexagonal inscribed circle of the outer shell 25 is 90mm, the central angle of the rounded corner is 120 degrees, the radius of the rounded corner is 20mm, and the side length of the regular hexagon on the inner side of the second spoiler 262 on the outer shell 25 is 75mm; the distribution of the catalyst particles at the time of t=0 is shown in fig. 10, the catalyst particles are uniformly distributed in the high-voltage electrostatic separation device, 20KV voltage is applied to the central copper electrode 24, the shell 25 is grounded, and after being electrified, the movement track of the catalyst particles changes with time as shown in fig. 11, 12 and 13, and as can be seen in fig. 11, 12 and 13, most of the catalyst particles are adsorbed to the top corner of the central copper electrode 24 with the passage of time, which indicates that the catalytic cracking slurry stripping system of the invention is feasible.
The back flushing processes of the traditional electrostatic solid-liquid separator and the high-voltage electrostatic separation device are respectively simulated by CFD software, so that model simplification is performed for saving calculation time, and the simulation result shows that when the height of the filler is 45mm, the back flushing time of the traditional electrostatic solid-liquid separator is 5min at maximum, and the particle residual rate in the electrostatic solid-liquid separator is 15.35%; under the same height and the same parameters, the back flushing time of the high-voltage electrostatic separation device is 3min at maximum, and the particle residual rate after back flushing is only 3.84%; therefore, the high-voltage electrostatic separation device has obvious advantages in the aspect of back flushing.
Compared with the prior art, the invention has the beneficial effects that: the catalytic cracking slurry oil solid removing system is a complete and compact continuous operation system, one of the high-voltage electrostatic separating devices such as the first high-voltage electrostatic separating device B is in a solid removing and purifying state, and the other high-voltage electrostatic separating device such as the second high-voltage electrostatic separating device C is in a back flushing state, so that continuous operation is realized, and the control is easy and the operation is convenient; the high-voltage electrostatic separation device forms an electric field with non-uniform distribution between the central copper electrode 24 and the shell 25, and under the action of the spoiler, the flow field inside the high-voltage electrostatic separation device is non-uniform in distribution, so that the adsorption of particles is more facilitated, the separation efficiency is improved, and the solid removal effect is good; the inside of the high-voltage electrostatic separation device is not filled, so that the blocking phenomenon is avoided, the back flushing is more rapid, complex parts such as a filler inlet, a filler pressing plate and a filler supporting plate are reduced, the high-voltage electrostatic separation device is convenient to detach and easy to maintain, and meanwhile, the production cost is reduced.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the invention.
Claims (4)
1. A catalytic cracking slurry oil solid removing system is characterized in that: the device comprises a raw material slurry storage tank, a high-voltage electrostatic separation device and a purified slurry storage tank, wherein the raw material slurry storage tank is connected with the high-voltage electrostatic separation device through a purification pipeline, and the high-voltage electrostatic separation device is also connected with the purified slurry storage tank through the purification pipeline;
the purifying slurry oil storage tank is also connected with the high-voltage electrostatic separation device through a back flush pipeline, and the high-voltage electrostatic separation device is also connected with the raw material slurry oil storage tank through a back flush pipeline;
the high-voltage electrostatic separation device comprises a shell, wherein the shell is a peripheral copper electrode, a central copper electrode coaxially arranged is arranged in the shell, a spoiler is arranged between the central copper electrode and the shell, the central copper electrode is connected with a high-voltage electrostatic generator, and an oil slurry inlet, an oil slurry outlet, a backwash liquid inlet and a backwash liquid outlet are respectively arranged on the shell;
the spoiler comprises a plurality of first spoilers arranged on the central copper electrode at intervals and a plurality of second spoilers arranged inside the shell at intervals, and the first spoilers and the second spoilers are arranged in a staggered manner;
the outer surface of shell is the cylinder, the center copper electrode with the internal surface of shell is regular hexagonal prism type setting, the apex angle of center copper electrode is 25-35 degrees rather than the angle between the nearest apex angle of internal surface of shell, the apex angle of center copper electrode with the apex angle of internal surface of shell all adopts the fillet setting, first spoiler is regular hexagonal prism type setting, the second spoiler is regular hexagonal prism type setting also, the apex angle of first spoiler respectively with the apex angle of center copper electrode corresponds unanimously, the apex angle of second spoiler also respectively with the apex angle of center copper electrode corresponds unanimously.
2. The catalytic cracking slurry removal system of claim 1, wherein:
the back flushing liquid outlet is provided with a control valve, and comprises a lower outlet, a middle outlet and an upper outlet, and the control valve is connected with a controller.
3. The catalytic cracking slurry removal system of claim 1, wherein:
the high-voltage electrostatic separation devices are arranged in two sets, and the two sets of high-voltage electrostatic separation devices are arranged in parallel.
4. A catalytic cracking slurry oil de-solidification method is characterized in that: the process of removing solids from a catalytic cracking slurry oil on a catalytic cracking slurry oil removal system according to any one of claims 1 to 3, comprising the steps of:
1) The catalytic cracking slurry oil enters a high-voltage electrostatic separation device from a raw slurry oil storage tank through a purification pipeline, the flow rate of the catalytic cracking slurry oil entering the high-voltage electrostatic separation device is 100-500mL/min, the voltage of a high-voltage electrostatic separator in the high-voltage electrostatic separation device is 15-30KV, and the catalytic cracking slurry oil after the solid removal treatment in the high-voltage electrostatic separation device enters a purified slurry oil storage tank through a purification pipeline for storage;
2) When the high-voltage electrostatic separation device needs to be flushed, the purified catalytic cracking slurry in the purified slurry oil storage tank enters the high-voltage electrostatic separation device through a back flushing pipeline, the back flushing flow of the purified catalytic cracking slurry oil is 1-1.5L/min, the back flushing is performed on the high-voltage electrostatic separation device along the direction opposite to the solid removal and purification direction of the catalytic cracking slurry oil, the back flushing time is 30-60min, and the catalytic cracking slurry oil after back flushing the high-voltage electrostatic separation device enters the raw slurry oil storage tank through the back flushing pipeline for further purification and solid removal treatment.
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| CN111303937A (en) * | 2019-08-20 | 2020-06-19 | 武汉兰兆科技有限公司 | Electric separation device and electric separation process for on-line recycling of Fischer-Tropsch synthesis catalyst |
| CN111303934A (en) * | 2019-09-10 | 2020-06-19 | 武汉兰兆科技有限公司 | Method for refining catalytic cracking external throwing slurry oil through electrostatic separation |
| CN111349456B (en) * | 2020-04-13 | 2021-11-02 | 中国石油大学(华东) | Electrostatic separator capable of changing packing accumulation mode and cleaning method |
| CN113667512B (en) * | 2021-09-06 | 2022-09-16 | 中国石油大学(华东) | Viscosity reduction and solid removal integrated device for catalytic cracking slurry oil |
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| CN208414343U (en) * | 2018-04-26 | 2019-01-22 | 中国石油大学(华东) | A kind of de- solid system of catalytic cracked oil pulp |
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| US4059498A (en) * | 1976-10-06 | 1977-11-22 | Gulf Research & Development Company | Radial flow electrostatic filter |
| NO316109B1 (en) * | 2001-11-07 | 2003-12-15 | Aibel As | A coalescer device |
| US9480936B2 (en) * | 2012-05-02 | 2016-11-01 | Gary D. Hanks | Multistage composite fluid separator and filter |
| CN107118796A (en) * | 2017-06-20 | 2017-09-01 | 襄阳航生石化环保设备有限公司 | Slurry oil electrostatic separating method and slurry oil electrostatic separation equipment |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB8413734D0 (en) * | 1984-05-30 | 1984-07-04 | Shell Int Research | Separating dispersed liquid phase from continuous liquid phase |
| CN103484148A (en) * | 2013-09-29 | 2014-01-01 | 中国石油大学(华东) | Purifying equipment and purifying method for purifying catalytic cracking slurry oil |
| CN208414343U (en) * | 2018-04-26 | 2019-01-22 | 中国石油大学(华东) | A kind of de- solid system of catalytic cracked oil pulp |
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