CN218688157U - Membrane tube type coal tar filtering device - Google Patents

Abstract

The utility model belongs to the technical field of the filter, a membrane tubular coal tar filter equipment is related to, including a jar body and arrange jar internal draft tube, membrane pipe and tube sheet in respectively, tube sheet, draft tube and jar coaxial setting of body, tube sheet and the contact of internal wall of jar, the draft tube is located the tube sheet below, set up material import and discharge gate on the jar body respectively, the discharge gate is located the tube sheet top, material import and the inside intercommunication of draft tube, the membrane pipe is arranged in the draft tube and is the same with the draft tube axial, the membrane pipe upper end is stretched out outside the draft tube and is fed through tube sheet and discharge gate, the membrane pipe lower extreme stretches out outside the draft tube and jar body coupling. The utility model provides a simple structure, safe and reliable, equipment long service life, membrane tube type coal tar filter equipment that filtration efficiency is high.

Description

Membrane tube type coal tar filtering device

Technical Field

The utility model belongs to the technical field of the filter, a coal tar filter equipment is related to, especially, relate to a membrane tubular coal tar filter equipment.

Background

The coal tar hydrogenation process is a leading-edge technology of coal grading, quality-based comprehensive utilization, clean and efficient utilization and energy revolution strategy, the coal tar produced at present contains a large amount of solid particles such as coal dust, which are the main reasons for blocking a coal tar hydrocracking catalyst.

In order to filter solid particles such as dust in coal tar, the conventional coal tar hydrogenation process adopts processes such as delayed coking to treat the solid particles such as dust in coal tar, and the waste of the coal tar serving as a raw material is easily caused due to the limitation of process conditions; thus, membrane tube filtration devices have emerged, which, although they enable the filtration of coal tar, nevertheless have the following problems:

1) The existing filtering device is directly fed, materials can directly impact the membrane tube, so that the membrane tube is easily damaged, the service life of equipment is shortened, and the filtering efficiency is low;

2) The existing filtering device is a fatigue use environment, so that the stability of the membrane tube is poor when the filtering device is used for a long time, the membrane tube is easy to tear and deform during back blowing, and the service life of the membrane tube is shortened;

3) When the existing filtering device is used for filtering, asphaltene and colloid in coal tar are attached to the surface of a membrane tube, and back-blowing cleaning is needed, but the cleaning effect is poor, and the filtering effect of the membrane tube is influenced.

SUMMERY OF THE UTILITY MODEL

In order to solve the technical problem that the equipment fragile, the filtration efficiency is low that current coal tar filter exists, the utility model provides a simple structure, safe and reliable, equipment long service life, the high membrane tube type coal tar filter equipment of filtration efficiency.

The technical scheme for solving the technical problems is as follows:

the utility model provides a membrane tubular coal tar filter equipment, includes a jar body and arranges jar internal draft tube, membrane pipe and tube sheet in respectively, tube sheet, draft tube and jar coaxial setting of body, tube sheet and the contact of internal wall of jar, the draft tube is located the tube sheet below, set up material import and discharge gate on the jar body respectively, the discharge gate is located the tube sheet top, material import and the inside intercommunication of draft tube, the membrane pipe is arranged in the draft tube and is the same with the draft tube axial, the membrane pipe upper end is stretched out outside the draft tube and is fed through tube sheet and discharge gate, the membrane pipe lower extreme stretches out outside the draft tube and jar body coupling.

Furthermore, the membrane pipe is one or more, and a plurality of membrane pipes are evenly distributed in the radial direction of the tank body.

Further, a through hole penetrating through the tube plate is arranged in the axial direction of the tube plate; the upper ends of the membrane tubes are connected with the tube plates and communicated with the discharge hole through the through holes.

Furthermore, the through holes are divided into four groups, and the four groups of through holes are arranged on the tube plate according to a large-interval square.

Furthermore, the thickness of the tube plate is 100-120 mm, and the minimum width of a hole bridge between the through holes is more than or equal to 4.1mm.

Furthermore, the membrane tube type coal tar filtering device also comprises a fixed disk which is arranged in the tank body and is positioned below the membrane tube, the axial direction of the fixed disk is the same as the axial direction of the tank body, and the fixed disk is contacted with the inner wall of the tank body; the lower ends of the membrane tubes are connected with the upper surface of the fixed disc.

Further, the fixed disc comprises a hole plate and a reinforcing rib plate arranged below the hole plate; the reinforcing rib plates and the pore plates form an inverted T-shaped structure; the pore plate is a grating plate, and the lower ends of the membrane tubes are connected with the upper surface of the pore plate.

Furthermore, the membrane tube type coal tar filtering device also comprises a pull rod arranged between the tube plate and the reinforcing rib plate, and the pull rod is axially the same as the tank body.

Furthermore, the membrane tube type coal tar filtering device also comprises a back-blowing nitrogen gas tube and an oil residue outlet which are respectively arranged on the tank body; the back-blowing nitrogen pipe is located above the discharge port, the oil residue outlet is located below the reinforcing rib plate, and the back-blowing nitrogen pipe is communicated with the oil residue outlet sequentially through the membrane pipe and the pore plate.

Furthermore, the membrane tube type coal tar filtering device also comprises a back-blowing steam pipe, a residual clear oil outlet, a filtered oil recovery port and an exhaust port which are arranged on the tank body; the residual clear oil outlet is positioned below the fixed disc and communicated with the interior of the tank body, the filtered oil recovery port and the exhaust port are axially and symmetrically arranged relative to the tank body, and the filtered oil recovery port is communicated with the upper surface of the tube plate; the exhaust port is communicated with the lower surface of the tube plate; the back-blowing steam pipe is positioned above the discharge hole and is communicated with the oil residue outlet through the membrane pipe and the pore plate in sequence.

The beneficial effects of the utility model reside in that:

1. the utility model discloses in set up the draft tube, the raw materials coal tar gets into the draft tube from the feed inlet for distribution that the raw materials can be even is upwards at jar body week, can prevent that raw materials coal tar from to the direct impact of membrane pipe, reduces the damage of membrane pipe, thereby promotes the life of membrane pipe.

2. The utility model discloses set up the tube sheet, set up the through-hole on the tube sheet, the membrane tube upper end is connected with the tube sheet lower surface, then the clean material that has filtered flows to the tube sheet top from the through-hole to discharge from the discharge gate, can ensure material evenly distributed, changed the feeding drawback of single feed inlet, the effectual impact of having solved the material to the membrane tube plays the key role to equipment long period operation.

3. The utility model discloses in, the through-hole on the tube sheet adopts the large-pitch square to arrange, and the dregs of fat after the filtration can fall down smoothly, and the large-pitch can make the clearance become simple simultaneously, has sufficient clearance to make the dregs of fat drop and fall into lower part cone department after the blasting blowback. The tube plate is still stable after the pressure is suddenly released and the tube plate is stressed by strong pressure through methods of increasing the nominal thickness of the tube plate, limiting the minimum width of each hole bridge and the like.

4. The utility model discloses set up the fixed disk, every membrane pipe lower extreme all with fixed disk upper surface connection, fix the membrane pipe, improve the stability of membrane pipe, make the membrane pipe can not take place to tear, warp when vibration or blowback, further improve equipment life cycle, reduce maintenance duration and expense.

5. The utility model discloses in, the fixed disk adopts extremely narrow structure, reduces the resistance when falling the dregs of fat, and is a whole, adopts cold cutting mode cutting steel sheet during the manufacturing, guarantees metal surface's roughness, with "T" type welded mode, can be when guaranteeing required design strength, does not obstruct the route that the dregs of fat dropped, requires the unexplained orifice plate projection scope of gusset to the attachment point of dregs of fat when not additionally increasing operation and blowback. Furthermore, the lower end of the membrane tube is fixed by the fixed disc.

6. The utility model blows nitrogen into the tank body through the back-blowing nitrogen pipe, and blows the residue attached to the membrane pipe down to the lower part of the equipment by using nitrogen, thereby improving the filtering precision of the membrane pipe and the stable operation of the device; furthermore, through the combination of a back-blowing steam pipe, a residual clear oil outlet, a filtered oil recovery port, an exhaust port and a residual oil outlet, the blasting back-blowing is realized, solid particles attached to the membrane tube can be blown off to a great extent, the back-blowing effect is enhanced, and the filtering precision of the membrane tube is improved.

Drawings

Fig. 1 is a schematic structural diagram of a filtering device provided by the present invention;

FIG. 2 is a schematic view of the draft tube of FIG. 1 according to the present invention;

figure 3 is a schematic view of the tube sheet of figure 1 of the present invention;

figure 4 is a schematic view of the mounting plate of figure 1 of the present invention;

FIG. 5 is a schematic view of the membrane tubes and tube sheet connection of FIG. 1 according to the present invention;

wherein:

1-material inlet; 2, discharging a material outlet; 3-oil residue outlet; 4-safety valve port; 5, back blowing the steam pipe; 6-a back-blowing nitrogen pipe; 7-residual clear oil outlet; 8-filtered oil recovery port; 9-exhaust port; 10, a guide cylinder; 11-membrane tube; 12, fixing a disc; 121-orifice plate; 122-reinforcing rib plate; 13-a pull rod; 14-a tube plate; 15-a bushing; and 16, pipe blocking.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

Example 1

Referring to fig. 1 and 2, a membrane tube type coal tar filtering device comprises a tank body, a guide shell 10, a membrane tube 11 and a tube plate 14, wherein the guide shell 10, the membrane tube 11 and the tube plate 14 are respectively arranged in the tank body, the tube plate 14, the guide shell 10 and the tank body are coaxially arranged, the tube plate 14 is in contact with the inner wall of the tank body, the guide shell 10 is positioned below the tube plate 14, the tank body is respectively provided with a material inlet 1 and a material outlet 2, the material outlet 2 is positioned above the tube plate 14, the material inlet 1 is communicated with the inside of the guide shell 10, the membrane tube 11 is arranged in the guide shell 10 and is axially identical to the guide shell 10, the upper end of the membrane tube 11 extends out of the guide shell 10 and is communicated with the material outlet 2 through the tube plate 14, and the lower end of the membrane tube 11 extends out of the guide shell 10 and is connected with the tank body.

The jar body is that the lower part is conical cylindrical jar, and jar body left side wall middle part sets up material import 1, sets up discharge gate 2 on the jar body right side wall, and discharge gate 2 is located material import 1 top, and tube sheet 14 is located discharge gate 2 below. In order to prevent the tank body from being damaged by overpressure during steam back blowing, the top of the tank body is also provided with a safety valve port 4, when the pressure of the tank body exceeds 1.58MPa (G), the safety valve is automatically opened to release part of the pressure of the tank body, and when the pressure of the tank body is less than 1.58MPa, the safety valve is automatically closed.

The tube plate 14 is a cylindrical plate, the axial direction of the tube plate 14 is coaxial with the tank body, and the outer wall of the tube plate 14 is in contact connection with the inner wall of the tank body.

The draft tube 10 is located the tube sheet 14 below, and draft tube 10 and the coaxial setting of jar body, and the jar body diameter of draft tube 10 periphery is great, and draft tube 10 leaves the gap with between, and the axial center line of material import 1 is the same level with 1/2 department of draft tube 10 axial height, and material import 1 extends to jar internal extension and communicates with draft tube 10 from a jar external wall, is convenient for make the material evenly get into jar internally through draft tube 10.

The membrane tube 11 is arranged in the guide shell 10, the height of the membrane tube 11 is higher than that of the guide shell 10, the upper end of the membrane tube 11 and the lower end of the membrane tube 11 extend out of the guide shell 10 and are connected with the tube plate 14, the membrane tube 14 is communicated with the discharge hole 2, and the lower end of the membrane tube 11 extends downwards out of the lower portion of the guide shell 10 and is fixedly connected with the inner wall of the tank body.

The number of the membrane tubes 11 is one or more, a plurality of membrane tubes 11 are distributed in the radial direction in the tank body for one circle, in the implementation, the number of the membrane tubes 11 is 206, and the upper ends of the membrane tubes 11 are in threaded connection with the tube plate 14.

During the implementation, the former feed coal tar gets into from material import 1 and earlier through draft tube 10, under the effect of draft tube 10, make former feed coal tar evenly distributed in draft tube 10, and flow to membrane tube 11 evenly, and realize the separation through membrane tube 11, block solid particle, colloid etc. on membrane tube 11 outer wall, clean material upwards flows into tube sheet 14 top from membrane tube 11, through discharge gate 2 discharge filter, realize filtering, can prevent the direct impact of former feed coal tar to the membrane tube through setting up of draft tube 10, prevent the damage that the impact force caused to the membrane tube, thereby promote the life of membrane tube.

Example 2

Referring to fig. 3, on the basis of embodiment 1, a through hole is provided in the tube plate 14; the upper end of the membrane tube 11 is connected with the tube plate 14 by adopting a type with an internal thread bushing and an external thread tube head, and is communicated with the discharge hole 2 through a through hole.

Referring to fig. 3, the number of the through holes is multiple, and through multiple tests, in order to ensure that the filtered filter residue is smoothly blown down by the blowback gas, the through holes on the tube plate 14 are arranged in a square shape, the through holes are divided into four groups, and the four groups of through holes are arranged on the tube plate 14 according to the square shape with large spacing.

Specifically, the tube sheet 14 is a circular sheet, the surface of the circular sheet is divided into four regions (corresponding to four quadrants), each region is provided with a plurality of through holes, and the structures formed by the through holes in the four regions are mirror images of each other; the plurality of through holes distributed in each region are distributed in a step-like structure.

In practice, the thickness of the tube plate 14 is 100-120 mm, and the minimum width of the hole bridge between the through holes is more than or equal to 4.1mm. By increasing the thickness of the tube sheet, limiting the minimum width of the bridges between the through holes, etc., the tube sheet 14 is strong and stable when the pressure is suddenly released.

The upper end of the membrane tube 11 is in threaded connection with the through hole, the upper end of the membrane tube 11 is flush with the upper surface of the tube plate, a lining with internal threads is arranged at the through hole in spot welding, the lower end of the membrane tube 11 penetrates through the positioning hole of the fixed disk 12, so that the two ends of the membrane tube 11 are fixed, materials entering the membrane tube can be distributed uniformly, and a key effect is realized on long-period operation of equipment.

Referring to fig. 5, the membrane tube 11 is a tube shape with an internal central control, and is divided into an upper section, a middle section and a lower section, wherein the upper section is a tube head, the lower section is a tube tail, and the middle section and the lower section are connected through a tube plug 16; and the diameters of the upper section and the middle section of the pipe column are equal, the diameter of the lower section of the pipe column is reduced, and the bottom of the pipe column is conical. And a lining 15 is arranged outside the tube head and is connected with the tube plate 14 through the lining 15, and the lining 15 is connected with the tube plate 14 through a spot welding mode.

In the embodiment, the through holes on the tube plate 14 are arranged in a large-interval square shape, so that the filtered oil residue can smoothly fall down, and the large interval can simplify the cleaning; after the blasting and back blowing, enough clearance is reserved to enable the oil residue to fall off and fall into the lower cone.

Example 3

Referring to fig. 1, on the basis of embodiment 2, the membrane tube type coal tar filtering device further comprises a fixed disk 12 which is arranged in the tank body and located below the membrane tube 11, wherein the axial direction of the fixed disk 12 is the same as the axial direction of the tank body, the fixed disk 12 is in contact with the inner wall of the tank body, and the lower end of the fixed disk 12 and the lower end of the membrane tube 11 are both connected with the fixed disk 12.

Referring to fig. 4, the fixed platter 12 includes a reinforcing rib plate 122 in which the orifice plate 121 is disposed under the orifice plate 121; the stiffener plates 122 and the orifice plate 121 form an inverted "T" shaped structure.

The orifice plate 121 is a cylindrical grid plate, and a plurality of positioning holes are formed in the upper surface of the orifice plate 121; the positions of the positioning holes and the film tubes are aligned one by one, and the film tubes 11 are connected with the pore plate 121 through the positioning holes.

Deep floor 122 is the circular grid board that vertically and horizontally staggered's reinforcing bar is constituteed, and the effect plays the supporting role to orifice plate 121, and increase strength strengthens the stability of membrane tube 11.

In practice, the fixing plate 12 is welded in an inverted "T" shape and is a whole. During manufacturing, a cold cutting mode is adopted to cut the steel plate, so that the flatness of the surface of the fixed disc is ensured; the required design strength is ensured, and meanwhile, the reinforcing rib plates 122 do not protrude out of the projection range of the pore plate, and the attachment points of the oil residue during operation and back flushing are not additionally increased; thus, after the filtered and back-blown oil residues fall off from the outer surface of the membrane tube 11, the oil residues can smoothly fall into the lower part of the equipment due to small attachment points.

The fixing disc 12 can fix the lower end of the membrane tube 11, so that the membrane tube is not torn or deformed due to vibration and back blowing. Meanwhile, through the design of the inverted T-shaped structure and the positioning holes, the path of falling oil residues cannot be blocked, and the strength is good.

Further, the membrane tube type coal tar filtering device also comprises a pull rod 13 arranged between the tube plate 14 and the reinforcing rib plate 122, and the pull rod 13 is axially the same as the tank body. The tube plate 14 and the reinforcing rib plate 122 are stably connected through the pull rod 13, and the stability of the membrane tube is enhanced; meanwhile, the later-stage fixed disk 12 is convenient to maintain, disassemble and assemble and is convenient to use. During the implementation, pull rod 13 can set up a plurality ofly, and a plurality of pull rod 13 are along jar radial evenly distributed of body, and stability is better, the operation of being convenient for.

Example 4

Referring to fig. 1, on the basis of embodiment 3, the membrane tube type coal tar filtering device further comprises a back-blowing nitrogen gas tube 6 and an oil residue outlet 3 which are respectively arranged on the tank body; the back-blowing nitrogen pipe 6 is positioned above the discharge port 2, the oil residue outlet 3 is positioned below the reinforcing rib plate 122, and the back-blowing nitrogen pipe 6 is communicated with the oil residue outlet 3 sequentially through the pipe plate 14, the membrane pipe 11 and the fixed disk 12.

When the method is implemented, the top of the tank body is provided with a back blowing nitrogen pipe 6, the back blowing nitrogen pipe 6 is arranged outside the tank body and communicated with the inside of the tank body, a back blowing nitrogen valve is arranged on the back blowing nitrogen pipe 6, and the bottom of the tank body is provided with an oil residue outlet 3.

In the filtering process, solid particles, colloid and the like attached to the outer wall of the membrane tube 11 are increased more and more, so that when the pressure difference between the material inlet 1 and the material outlet 2 exceeds 0.1MPa, at the moment, a back-blowing nitrogen valve on the back-blowing nitrogen tube 6 is opened, nitrogen is blown into the tank body, residues attached to the membrane tube 11 are blown off by the nitrogen, then fall into the cone part at the lower part of the tank body through the fixed disk 12, and are discharged from the oil residue outlet 3.

If the pressure difference is still high after the nitrogen is subjected to back flushing for many times, blasting back flushing is required.

Further, referring to fig. 1, the membrane tube type coal tar filtering device further comprises a back-blowing steam tube 5, a residual clear oil outlet 7, a filtered oil recovery port 8 and an exhaust port 9 which are arranged on the tank body; the residual clear oil outlet 7 is positioned below the fixed disc 12 and communicated with the interior of the tank body, the filtered oil recovery port 8 and the exhaust port 9 are axially and symmetrically arranged relative to the tank body, and the filtered oil recovery port 8 is communicated with the upper surface of the tube plate 14; the exhaust port 9 is communicated with the lower surface of the tube plate 14; the back-blowing steam pipe 5 is positioned above the discharge port 2, and the back-blowing steam pipe 5 is communicated with the oil residue outlet 3 through the pipe plate 14, the membrane pipe 11 and the fixed disc 12.

Specifically, the filtered oil recovery port 8 and the exhaust port 9 are respectively arranged on the side walls of the tank body at two ends of the tube plate 14, the filtered oil recovery port 8 and the exhaust port 9 are axially symmetrical about the tank body, the residual clear oil outlet 7 is positioned at the lower part of the right side, the oil residue outlet 3 is positioned between the fixed disk 12 and the reverse blowing steam pipe 5, the reverse blowing steam pipe 5 is positioned at the top of the tank body, the reverse blowing steam pipe 5 is arranged outside the tank body and communicated with the inside of the tank body, the reverse blowing steam pipe 5 is axially parallel to the reverse blowing nitrogen pipe 6, and a reverse blowing steam valve is arranged on the reverse blowing steam pipe 5.

Specifically, the operation steps of blasting and back blowing are as follows:

step one, closing a material inlet 1 and a material outlet 2, opening a filtered oil recovery port 8, and discharging clean coal tar in the upper area of a tube plate 14 from a tank body into a standby buffer tank;

secondly, opening valves arranged on the residual clear oil outlet 7, discharging the clear oil residual in the cavity below the fixed disc 12 into a standby clear oil tank from the tank body, and closing all the valves after the clear oil is discharged;

and thirdly, opening a back-blowing steam valve on a back-blowing steam pipe 5 to suppress the pressure in the tank body to 0.5MPa, opening a quick-opening valve arranged on the oil residue outlet 3, blowing off solid particles attached to the outer wall of the membrane pipe 11 by utilizing the explosion principle, and discharging the solid particles from the oil residue outlet 3.

The asphaltene and the colloid attached to the outer surface of the membrane tube 11 can be separated to a greater extent by repeating the steps twice to three times, so that the equipment is recovered to a use state.

The embodiment makes the colloid difficult to blow off by nitrogen gas through the blasting effect drop, and the continuous implementation of 2-3 times blasting blowbacks can reduce the attachment to minimum, prolongs the filter maintenance frequency, and the maintenance cost makes the equipment run production safely and stably for a long period.

In summary, the technical scheme provided by the utility model can prevent the impact of the material on the membrane tube, the material is distributed uniformly, and the service cycle of tube-spreading is prolonged; the membrane tubes are uniformly distributed and have better material uniformity through the through holes in the tube plates, the stability of the membrane tubes is ensured through the positioning holes in the fixed disc, and meanwhile, the membrane tubes are easy to replace; and finally, the back flushing effect is good by combining back flushing nitrogen and steam back flushing blasting, the substances such as asphaltene, colloid and the like adhered to the membrane tube can be removed to the greatest extent, the filtering precision is improved, the stable operation of the equipment is ensured, and the online service cycle is long.

Claims (10)

1. The utility model provides a membrane tubular coal tar filter equipment, its characterized in that, including a jar body and arrange jar internal draft tube (10), membrane pipe (11) and tube sheet (14) in respectively, tube sheet (14), draft tube (10) and jar coaxial arrangement of body, tube sheet (14) and jar internal wall contact, draft tube (10) are located tube sheet (14) below, set up material import (1) and discharge gate (2) on the jar body respectively, discharge gate (2) are located tube sheet (14) top, material import (1) and draft tube (10) inside intercommunication, membrane pipe (11) are arranged in draft tube (10) and are the same with draft tube (10) axial, membrane pipe (11) upper end is stretched out outside draft tube (10) and is managed board (14) and discharge gate (2) intercommunication, membrane pipe (11) lower extreme stretches out outside draft tube (10) and jar body coupling.

2. The membrane tube type coal tar filtering device according to claim 1, wherein the number of the membrane tubes (11) is one or more, and a plurality of the membrane tubes (11) are uniformly distributed in a radial direction of the tank body.

3. The membrane tube coal tar filtering device according to claim 2, characterized in that the tube sheet (14) is provided with through holes penetrating through the tube sheet (14) in the axial direction; the upper ends of the membrane tubes (11) are connected with the tube plate (14) and are communicated with the discharge hole (2) through the through holes.

4. The membrane tube type coal tar filtering device according to claim 3, wherein the number of the through holes is multiple, the multiple through holes are divided into four groups, and the four groups of the through holes are arranged on the tube plate (14) in a square mode at large intervals.

5. The membrane tube type coal tar filtering device according to claim 4, wherein the thickness of the tube sheet (14) is 100-120 mm, and the minimum width of a hole bridge between through holes is more than or equal to 4.1mm.

6. The membrane tube type coal tar filtering device according to claim 5, further comprising a fixed disc (12) arranged in the tank body and positioned below the membrane tube (11), wherein the fixed disc (12) has the same axial direction as the tank body, and the fixed disc (12) is in contact with the inner wall of the tank body; the lower ends of the membrane tubes (11) are connected with the upper surface of the fixed disk (12).

7. The membrane tube coal tar filtering device according to claim 6, wherein the fixed disc (12) comprises a perforated plate (121) and a reinforcing rib plate (122) disposed below the perforated plate (121); the reinforcing rib plate (122) and the pore plate (121) form an inverted T-shaped structure; the pore plate (121) is a grating plate, and the lower ends of the membrane tubes (11) are connected with the upper surface of the pore plate (121).

8. The membrane tube type coal tar filter device according to claim 7, further comprising a pull rod (13) disposed between the tube sheet (14) and the reinforcing plate (122), wherein the pull rod (13) is axially identical to the tank body.

9. The membrane tube type coal tar filtering device according to claim 8, further comprising a back-blowing nitrogen gas tube (6) and an oil residue outlet (3) which are respectively arranged on the tank body; the back-blowing nitrogen pipe (6) is located above the discharge hole (2), the oil residue outlet (3) is located below the reinforcing rib plate (122), and the back-blowing nitrogen pipe (6) is communicated with the oil residue outlet (3) sequentially through the membrane pipe (11) and the pore plate (121).

10. The membrane tube type coal tar filtering device according to claim 9, further comprising a back-blowing steam tube (5), a residual clear oil outlet (7), a filtered oil recovery port (8) and an exhaust port (9) which are arranged on the tank body; the residual clear oil outlet (7) is positioned below the fixed disc (12) and communicated with the interior of the tank body, the filtered oil recovery port (8) and the exhaust port (9) are axially and symmetrically arranged relative to the tank body, and the filtered oil recovery port (8) is communicated with the upper surface of the tube plate (14); the exhaust port (9) is communicated with the lower surface of the tube plate (14); the back-blowing steam pipe (5) is positioned above the discharge hole (2), and the back-blowing steam pipe (5) is communicated with the oil residue outlet (3) through a membrane pipe (11) and a pore plate (121) in sequence.

Images