Backwash catalyst separating and filtering device

Abstract

The invention discloses a backwash catalyst separating and filtering device which comprises a shell, a lower baffle and an upper baffle are arranged in the shell, a liquid inlet and a discharging port are formed in the lower portion of the shell, a liquid outlet and a backwash port are formed in the side wall of the shell, a plurality of filters are arranged in the shell, a movable cover is arranged at the top of each filter, and the movable covers are arranged on the back wash port. Lifting rods are arranged on the periphery of each movable cover, and a lifting switch is arranged on the side wall of the shell. The filter is of an annular structure and comprises a first flow guide layer, a first filter screen, a second filter screen and a second flow guide layer, flow guide columns are arranged on the first flow guide layer and the second flow guide layer correspondingly, and the gap between every two adjacent flow guide columns is decreased firstly and then increased in the direction from outside to inside; the Venturi effect can be fully utilized by arranging the flow guide columns, and the filtering speed and the backwashing effect are improved, so that the service life of the filter is prolonged, the running cost of the filter is reduced, and the slurry filtering system can stably run for a long time.

Description

Technical Field

[0001] The invention relates to the technical field of slurry filtration, and in particular to a backwash catalyst separation and filtration device. Background Art

[0002] Catalytic cracking slurry is a by-product of crude oil refining. It is rich in aromatics, colloids, and asphaltenes, and has the characteristics of high viscosity and density. It also contains a large amount of catalyst powder particles. The presence of catalyst powder will cause troubles in the operation of the extraction tower and solvent recovery, seriously limiting the comprehensive utilization of catalytic cracking slurry. Therefore, effective measures must be taken to efficiently and quickly remove the solid catalyst powder in the slurry.

[0003] At present, the methods for removing solid catalyst powder from slurry at home and abroad mainly include: sedimentation separation, filtration separation, electrostatic separation, centrifugal separation and auxiliary agent sedimentation separation method.

[0004] The filtration separation method is a separation technology that intercepts the catalyst solid powder in the slurry through a filter medium to purify the slurry. The filtration separation method has the advantages of simple equipment and operation, and stable separation efficiency.

[0005] Chinese patent document CN202010139648.2 discloses a catalytic cracking oil slurry filtering device and a catalytic cracking oil slurry filtering method. The catalytic cracking oil slurry filtering device includes an oil slurry feed tank, a first filtering device, and a second filtering device. The feed inlet of the first filtering device is connected to the discharge end of the oil slurry feed tank through a feeding device. The first concentrated liquid outlet of the first filtering device is connected in parallel with a first concentrated liquid pipe and a second concentrated liquid pipe. The first concentrated liquid pipe is connected to the first feed end of the oil slurry feed tank, and the first concentrated liquid pipe is provided with a first control valve. The first filtering device includes a first purified oil outlet; the feed inlet of the second filtering device is connected to the second concentrated liquid pipe, and the second concentrated liquid pipe is provided with a second control valve. The second purified oil outlet of the second filtering device is connected to the second feed end of the oil slurry feed tank. However, the device is prone to cake formation on the filter surface, which clogs the filter holes, and the filtering and purification effect decreases after use for a period of time.

[0006] Chinese patent document CN202010167921.2 discloses a porous filter material for external oil slurry filtration. The single filter element provided in this application has a two-stage structure, which can disperse the stress applied to the single filter element body, improve the structural strength of the filter element, and reduce the probability of the filter element breaking and deforming. The single filter element of the present invention can also be assembled, and multiple filter elements can be connected using reinforcing ribs, which effectively improves the overall structural strength of the grouped filter element and solves the problem of breakage in actual working conditions. However, the filtration speed and backwash effect of this filter element when used in oil slurry filtration are poor.

[0007] China is the world's largest country in catalytic cracking. With the increase in my country's refining capacity, the amount of slurry produced each year has increased year by year, and the annual output of slurry has reached millions of tons. Therefore, the comprehensive utilization of slurry has become an urgent matter, and how to remove catalyst powder from slurry has become the primary problem to be solved by refining companies. Summary of the Invention

[0008] In order to solve the deficiencies of the prior art, the purpose of the present invention is to provide a backwash catalyst separation filter device, which extends the service life of the slurry filter device, reduces the operating cost of the slurry filter device, and enables the slurry filtration system to operate stably for a long time.

[0009] In order to achieve the above object, the present invention adopts the following technical solutions:

[0010] A backwash catalyst separation and filtration device comprises a housing, a lower baffle and an upper baffle are provided in the housing, a liquid inlet and a discharge port are provided at the lower portion of the housing, a liquid outlet and a backwash port are provided on the side wall of the housing, a plurality of filters are provided in the housing, a movable cover is provided on the top of the filter, a lifting rod is provided around the periphery of each movable cover, and a lifting switch is provided on the side wall of the housing;

[0011] The filter is located between the lower baffle and the upper baffle, the upper end of the filter is fixedly connected to the upper baffle, and the lower end of the filter is fixedly connected to the lower baffle; the filter has an annular structure, including a first guide layer, a first filter screen, a second filter screen, and a second guide layer; filter balls are filled between the first filter screen and the second filter screen.

[0012] Preferably, a first through hole is formed on the lower baffle, and a filter inlet is provided at the bottom of the filter, and the first through hole and the filter inlet cooperate with each other.

[0013] Preferably, a second through hole is formed on the upper baffle, and the second through hole cooperates with the movable cover.

[0014] Preferably, the liquid inlet is close to the lower baffle, the discharge port is located in the center of the bottom of the shell, and the liquid outlet is close to the lower baffle.

[0015] Preferably, there are multiple backwash ports, which are symmetrically arranged along the axis of the shell.

[0016] Preferably, the lifting rod is fixedly connected to the upper baffle, and the other end of the lifting rod is fixedly connected to the movable cover.

[0017] Preferably, the lifting switch is electrically connected to the lifting rod.

[0018] Preferably, the second guide layer is located at the outermost part of the filter, and the first guide layer is located at the innermost part of the filter; the second filter screen is located inside the second guide layer and fixedly connected to the second guide layer, and the first filter screen is located outside the first guide layer and fixedly connected to the first guide layer.

[0019] Preferably, the first filter screen and the second filter screen are both porous mesh structures.

[0020] Preferably, the mesh diameters of the first filter screen and the second filter screen are smaller than the diameter of the filter ball.

[0021] Preferably, both the first guide layer and the second guide layer are provided with guide columns, and along the direction from outside to inside, the gap between two adjacent guide columns first decreases and then increases.

[0022] Preferably, the movable cover is located directly above the filter ball, the outer surface of the movable cover is engaged with the second filter screen, and the inner surface of the movable cover is engaged with the first filter screen.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] 1) The present invention provides a filter having an annular structure, in which a first guide layer, a first filter screen, a filter ball, a second filter screen, and a second guide layer are sequentially arranged from the inside to the outside to form a net-ball-net structure. Compared with the ordinary multi-layer metal filter screen superimposed structure, the filter can withstand greater filtration pressure and slurry flow, and the irregular filter holes formed by the accumulation of filter balls can also adapt to different catalyst forms; although the filter balls are limited between the first filter screen and the second filter screen, the different filter balls are independent individuals. When the slurry is passed through, the filter balls at different positions are subjected to different pressures in magnitude and direction. The filter balls can dissipate part of the pressure by squeezing, colliding, and rolling with each other, so that the filter balls have stronger pressure resistance and structural self-stability than the metal filter screen with a rigid integrated structure, and maintain a larger slurry flux at a higher filtration pressure, so that the catalyst separation filter device provided by the present invention has a better slurry filtration speed and catalyst interception rate.

[0025] 2) The backwash catalyst separation filter device provided by the present invention is provided with guide columns on the first guide layer and the second guide layer. Along the direction from the outside to the inside, the gap between two adjacent guide columns first decreases and then increases. In this way, the Venturi effect can be fully utilized to increase the slurry flow rate entering the filter, thereby improving the filtration speed; at the same time, during backwashing, the flow rate of the flushing liquid entering the filter can also be increased, thereby improving the backwashing effect.

[0026] 3) The present invention provides a backwash catalyst separation filter device, which can realize two working states of filtering slurry and backwashing by arranging a movable cover on the top of the filter; when filtering slurry, the movable cover is lowered by the lifting rod to limit the filter ball between the first filter screen and the second filter screen to form a net-ball-net filtering structure, and the slurry is drawn out of the filter after filtering; after a period of use, filter cakes will accumulate on the surface of the filter balls, affecting the filtering effect, at this time, the movable cover is lifted by the lifting rod to loosen the contact between the filter balls, and a flushing liquid is pulsed into the backwash port to flush the filter screen and the filter balls. Due to the reduced pressure resistance, the flushing liquid can drive the filter balls to rotate to make the filter cake on its surface easier to peel off, thereby achieving a good backwashing effect, solving the problems that the filter material is easily blocked by high-viscosity colloidal impurities, poor regeneration efficiency and low removal efficiency, overcoming the problems of complex filtration process, short operation cycle and high cost of the existing slurry filter device, extending the service life of the filter, reducing the filter operation cost, and enabling the slurry filtration system to operate stably for a long time. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only show schematic diagrams of certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0028] Figure 1 The backwash catalyst separation and filtration device provided by the present invention;

[0029] Figure 2 is a top view of the filter 8;

[0030] Figure 3 is a structural diagram of the second guide layer 805;

[0031] Figure 4 for Figure 3 AA-directed view in the middle;

[0032] Figure 5 for Figure 4 Enlarged view of middle E;

[0033] Figure 6 It is a vertical sectional view of the movable cover 9.

[0034] In the figure, 1. outer shell; 2. lower baffle; 201. first through hole; 3. upper baffle; 301. second through hole; 4. liquid inlet; 5. discharge port; 6. liquid outlet; 7. backwash port; 8. filter; 801. first guide layer; 802. first filter screen; 803. filter ball; 804. second filter screen; 805. second guide layer; 806. filter inlet; 807. guide column; 9. movable cover; 10. lifting rod; 11. lifting switch. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical solutions and advantages of the present invention clearer, the present invention is further described in detail below in conjunction with the embodiments. Of course, the specific embodiments described here are only used to explain the present invention and are not used to limit the present invention.

[0036] Terms like "first" and "second" are used solely to distinguish and should not be construed as indicating or implying relative importance. Furthermore, terms like "horizontal" and "vertical" do not necessarily require components to be absolutely horizontal or vertical; rather, they may be slightly tilted. For example, "horizontal" simply refers to a direction that is more horizontal than "vertical," not necessarily a perfectly horizontal structure; rather, it may be slightly tilted.

[0037] In the description of the present invention, it should also be noted that, unless otherwise expressly specified or limited, the terms "disposed," "installed," "connected," and "connected" should be understood broadly. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0038] Unless otherwise specified, the chemical reagents and materials in the present invention are purchased from commercial sources or synthesized from commercially purchased raw materials.

[0039] like Figures 1 to 6 As shown, the present invention provides a catalyst separation and filtration device in slurry, comprising a shell 1, a lower baffle 2 and an upper baffle 3 are provided in the shell 1, a liquid inlet 4 and a discharge port 5 are provided at the lower part of the shell 1, a liquid outlet 6 and a backwash port 7 are provided on the side wall of the shell 1, and the number of the backwash ports 7 can be multiple and symmetrically arranged along the axis of the shell 1, and the backwash port 7 is used to pass the flushing liquid during the backwashing period; a filter 8 is provided in the shell 1, and the number of the filters 8 can be multiple; a movable cover 9 is provided on the top of the filter 8, and lifting rods 10 are provided around the movable cover 9, and the number of the lifting rods can be multiple; a lifting switch 11 is provided on the side wall of the shell 1.

[0040] Specifically, the filter 8 is located between the lower baffle 2 and the upper baffle 3 , the upper end of the filter 8 is fixedly connected to the upper baffle 3 , and the lower end of the filter 8 is fixedly connected to the lower baffle 2 .

[0041] Specifically, the filter 8 has an annular structure, and includes, from the inside to the outside, a first guide layer 801, a first filter screen 802, a second filter screen 804, and a second guide layer 805; a filter ball 803 is filled between the first filter screen 802 and the second filter screen 804, and the filter ball 803 is a porcelain ball, a hollow metal ball, or a solid metal ball; the mesh diameter of the first filter screen 802 and the second filter screen 804 is smaller than the diameter of the filter ball 803; the second guide layer 805 is located at the outermost part of the filter 8, and the first guide layer 801 is located at the innermost part of the filter 8; the second filter screen 804 is located inside the second guide layer 805 and is welded and fixed to the second guide layer 805, and the first filter screen 802 is located outside the first guide layer 801 and is welded and fixed to the first guide layer 801.

[0042] Furthermore, a first through hole 201 is formed on the lower baffle 2 , and a filter inlet 806 is provided at the bottom of the filter 8 , and the first through hole 201 and the filter inlet 806 cooperate with each other.

[0043] Specifically, a second through hole 301 is formed on the upper baffle 3 , and the second through hole 301 cooperates with the movable cover 9 .

[0044] Specifically, the liquid inlet 4 is close to the lower baffle 2, and is used to introduce slurry during filtration and discharge backwash water during backwashing; the discharge port 5 is located at the center of the bottom of the shell 1, and is used to discharge catalyst powder and filter residue peeled off during backwashing.

[0045] Furthermore, the lifting rod 10 is fixedly connected to the upper baffle 3 , and the other end of the lifting rod 10 is fixedly connected to the movable cover 9 .

[0046] Specifically, the lifting switch 11 is electrically connected to the lifting rod 10 .

[0047] Furthermore, the first filter screen 802 and the second filter screen 804 are both porous mesh structures, and the mesh holes can be common shapes such as square, diamond, rectangle, circle, triangle, etc.

[0048] Specifically, the first guide layer 801 and the second guide layer 805 are both provided with guide columns 807 . From the outside to the inside, the gap between two adjacent guide columns 807 first decreases and then increases.

[0049] Specifically, the movable cover 9 is located directly above the filter ball 803 , and the outer surface of the movable cover 9 is engaged with the second filter screen 804 , and the inner surface of the movable cover 9 is engaged with the first filter screen 802 .

[0050] The present invention will be further described below with reference to specific examples.

[0051] Example 1

[0052] A catalyst separation and filtration device in slurry includes a shell 1, a lower baffle 2 and an upper baffle 3 are provided in the shell 1, a first through hole 201 is opened on the lower baffle 2, and a second through hole 301 is opened on the upper baffle 3. A liquid inlet 4 and a discharge port 5 are provided at the lower part of the shell 1, the liquid inlet 4 is close to the lower baffle 2, and the discharge port 5 is located at the bottom center of the shell 1; a liquid outlet 6 and a backwash port 7 are provided on the side wall of the shell 1, and the number of backwash ports is 4, which are stacked in 4 directions along the axis of the shell 1.

[0053] Two filters 8 are provided in the housing 1, and the filter 8 is located between the lower baffle 2 and the upper baffle 3. The upper end of the filter 8 is fixedly connected to the upper baffle 3, and the lower end of the filter 8 is fixedly connected to the lower baffle 2; the filter 8 is annular in structure, including a first guide layer 801, a first filter screen 802, a second filter screen 804, and a second guide layer 805; the second guide layer 805 is located at the outermost part of the filter 8, and the first guide layer 801 is located at the innermost part of the filter 8; the second filter screen 804 is located inside the second guide layer 805 and is welded to the second guide layer 805, and the first filter screen 802 is located outside the first guide layer 801 and is welded to the first guide layer 801; the first filter screen 802 and the second filter screen 804 are both The porous mesh structure is woven from metal wire; the diameter of the metal wire of the first filter screen 802 and the second filter screen 804 is 0.35 mm, and the filter hole is a square with a side length of 3 mm; the first guide layer 801 and the second guide layer 805 are both provided with guide columns 807. Along the direction from the outside to the inside, the gap between the two adjacent guide columns 807 first decreases and then increases. The maximum gap between the two adjacent guide columns 807 is 3.5 mm and the minimum gap is 2.7 mm; the first filter screen 802 and the second filter screen 804 are filled with filter balls 803, and the filter balls 803 are hollow stainless steel balls; the diameter of the filter balls 803 is 8 mm; a filter inlet 806 is provided at the bottom of the filter 8, and the first through hole 201 cooperates with the filter inlet 806.

[0054] A movable cover 9 is provided on the top of the filter 8, and the second through hole 301 cooperates with the movable cover 9; the movable cover 9 is located directly above the filter ball 803, and the outer surface of the movable cover 9 is engaged with the second filter screen 804, and the inner surface is engaged with the first filter screen 802.

[0055] Two lifting rods 10 are symmetrically provided around the periphery of each movable cover. The lifting rods 10 are fixedly connected to the upper baffle 3 , and the other ends of the lifting rods 10 are fixedly connected to the movable cover 9 .

[0056] A lifting switch 11 is provided on the side wall of the housing 1 , and the lifting switch 11 is electrically connected to the lifting rod 10 .

[0057] Working principle: During filtration, the lifting switch 11 is activated, and the lifting rod 10 drives the movable cover to descend, so that the filter balls 803 in the filter 8 contact each other and are limited to the first filter screen 802 and the second filter screen 804 to form a net-ball-net structure; the slurry is introduced into the outer shell 1 from the liquid inlet 4, and then enters the filter 8 from the filter inlet 806, and passes through the gap between the guide columns 807 on the first guide layer 801 to increase the slurry flow rate. After being filtered by the net-ball-net structure, it flows out from the second guide layer 805, and the catalyst powder remains inside the filter element 8 and drops to the bottom of the outer shell 1 under the action of gravity, and is discharged through the discharge port 5. The filtered slurry is discharged from the liquid outlet 6 and sent to the downstream system.

[0058] During backwashing, the lifting switch 11 is started, so that the lifting rod 10 drives the movable cover 9 to lift, thereby reducing the pressure resistance between the filter balls 803 in the filter 8, and introducing the flushing liquid from the backwashing port 7. The flushing liquid passes through the gaps between the guide columns 807 on the second guide layer 805, thereby increasing the flow rate of the flushing liquid and flushing the second filter screen 804 and the filter balls 803. The flushing liquid can drive the filter balls 803 to roll, causing the filter cake on the spherical surface of the filter balls 803 to peel off. The filter cake flows out of the first guide layer 801 with the flushing liquid, settles to the bottom of the shell 1 due to gravity, and is discharged through the discharge port 5. The backwashing water is discharged from the liquid inlet 4.

[0059] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A backwash catalyst separation filter device, characterized in that: The invention comprises a shell (1), wherein a lower baffle (2) and an upper baffle (3) are provided in the shell (1), a liquid inlet (4) and a discharge port (5) are provided at the lower portion of the shell (1), a liquid outlet (6) and a backwash port (7) are provided on the side wall of the shell (1), a plurality of filters (8) are provided in the shell (1), a movable cover (9) is provided on the top of the filter (8), a lifting rod (10) is provided around the periphery of each movable cover (8), and a lifting switch (11) is provided on the side wall of the shell (1); The filter (8) is located between the lower baffle (2) and the upper baffle (3); the upper end of the filter (8) is fixedly connected to the upper baffle (3), and the lower end of the filter (8) is fixedly connected to the lower baffle (2); the filter (8) is an annular structure, comprising a first guide layer (801), a first filter screen (802), a second filter screen (804), and a second guide layer (805); and filter balls (803) are filled between the first filter screen (802) and the second filter screen (804).

2. The separation and filtration device according to claim 1, characterized in that A first through hole (201) is provided on the lower baffle (2), and a filter inlet (806) is provided at the bottom of the filter (8), wherein the first through hole (201) and the filter inlet (806) cooperate with each other.

3. The separation and filtration device according to claim 1, characterized in that A second through hole (301) is formed on the upper baffle (3), and the second through hole (301) cooperates with the movable cover (9).

4. The separation and filtration device according to claim 1, characterized in that The liquid inlet (4) is close to the lower baffle (2), the discharge port (5) is located at the center of the bottom of the shell (1), and the liquid outlet (6) is close to the lower baffle (2).

5. The separation and filtration device according to claim 1, characterized in that: There are multiple backwash ports (7) which are symmetrically arranged along the axis of the housing (1).

6. The separation and filtration device according to claim 1, characterized in that: The lifting rod (10) is fixedly connected to the upper baffle (3), and the other end of the lifting rod (10) is fixedly connected to the movable cover (9).

7. The separation and filtration device according to claim 1, characterized in that: The lifting switch (11) is electrically connected to the lifting rod (10).

8. The separation and filtration device according to claim 1, characterized in that: The second guide layer (805) is located at the outermost portion of the filter (8), and the first guide layer (801) is located at the innermost portion of the filter (8); the second filter screen (804) is located inside the second guide layer (805) and is fixedly connected to the second guide layer (805), and the first filter screen (802) is located outside the first guide layer (801) and is fixedly connected to the first guide layer (801).

9. The separation and filtration device according to claim 1, characterized in that: The first filter screen (802) and the second filter screen (804) both have a porous mesh structure.

10. The separation and filtration device according to claim 1, characterized in that: The mesh diameters of the first filter screen (802) and the second filter screen (804) are smaller than the diameter of the filter ball (803).

11. The separation and filtration device according to claim 1, characterized in that: The first guide layer (801) and the second guide layer (805) are both provided with guide columns (807), and along the direction from outside to inside, the gap between two adjacent guide columns (807) first decreases and then increases.

12. The separation and filtration device according to claim 1, characterized in that: The movable cover (9) is located directly above the filter ball (803), and the outer surface of the movable cover (9) is engaged with the second filter screen (804), while the inner surface of the movable cover (9) is engaged with the first filter screen (802).

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