Slurry catalyst separating and filtering device

Abstract

The invention discloses a slurry 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 backwashing port are formed in the side wall of the shell, and a plurality of filters are arranged in the shell; the filter is located between the lower baffle and the upper baffle, the upper end of the filter is fixedly connected with the upper baffle, and the lower end of the filter is fixedly connected with the lower baffle; 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; filter balls are filled between the first filter screen and the second filter screen; according to the separating and filtering device, the slurry filtering speed is increased, the catalyst intercepting effect is improved, the service life of the slurry filtering device is prolonged, the operation cost of the slurry filtering device is reduced, and the slurry filtering system can stably operate for a long time.

Description

Technical Field

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

[0002] Catalytic cracking is an important process technology for lightening heavy oil to produce gasoline and diesel. It is one of the most important and widely used technologies in the current oil refining field. However, catalytic cracking will produce slurry as a by-product. The slurry is rich in polycyclic aromatic hydrocarbons (PAHs). PAHs can be used as raw materials for producing marine fuel, carbon black, carbon fiber, etc. However, because the oil slurry contains about 1 to 6 g / L of catalytic cracking catalyst particles, it cannot meet the raw material index requirements for producing marine fuel, carbon black, carbon fiber, etc. Therefore, effective measures must be taken to efficiently and quickly remove the solid catalyst powder in the slurry.

[0003] There are many methods to remove solid particles from slurry, such as sedimentation separation, filtration separation, electrostatic separation, centrifugal separation, and auxiliary agent sedimentation separation. Among them, filtration separation has the advantages of simple equipment and operation, and stable separation efficiency.

[0004] Chinese patent document 202010474781.3 discloses a device for separating residual catalyst particles in catalytic cracking oil slurry. The key points of its technical solution are: it includes a bottom skid, on which are provided an additive storage and delivery mechanism, a flocculation and aggregation reaction mechanism, an oil slurry filtering and discharging mechanism, a negative pressure adsorption treatment mechanism and a finished product storage mechanism; the flocculation and aggregation reaction mechanism includes a reactor, which is provided with an oil slurry outlet and an inlet, and the reactor is provided with a stirring and heating component; the oil slurry filtering and discharging mechanism includes a filter press and a filter press assembly, the reactor is connected to the filter press, the filter press is provided with a liquid outlet and a solid outlet, a receiving cylinder is provided below the filter press, and an opening and closing assembly is provided at the solid outlet; the negative pressure adsorption treatment mechanism includes a negative pressure cylinder, an adsorption cylinder is rotatably arranged in the negative pressure cylinder, the side wall of the adsorption cylinder is provided with a filter hole, the negative pressure cylinder is provided with a negative pressure assembly connected to the finished product storage mechanism, and a cleaning assembly is also provided in the negative pressure cylinder; the filtering device has a complex structure, and it is easy for cakes to form on the filtering surface and clog the filter holes, and the filtering and purification effect decreases after a period of use.

[0005] Chinese patent document CN201520408203.4 discloses a device for separating metal catalysts in slurry, including a filter, wherein a hollow first baffle and a second baffle are provided in the filter, and the end edges of the first baffle and the second baffle are fixed on the inner wall of the filter to divide the filter into a sedimentation zone, an intermediate zone and a degassing zone; the intermediate zone is filled with a filamentary ferromagnetic medium; the side wall of the filter is provided with a feed port connected to the sedimentation zone and a discharge port connected to the degassing zone, the top of the filter is provided with an exhaust port connected to the degassing zone, and the bottom of the filter is provided with a slurry discharge port connected to the sedimentation zone; the outer wall of the filter is provided with an electromagnet corresponding to the intermediate zone; however, the backwashing effect of the device is poor, and the filamentary ferromagnetic medium needs to be replaced frequently.

[0006] 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

[0007] In order to address the deficiencies in the prior art, the purpose of the present invention is to provide a slurry catalyst separation and filtration device, which improves the slurry filtration speed and catalyst interception effect, extends the service life of the slurry filtration device, reduces the operating cost of the slurry filtration device, and enables the slurry filtration system to operate stably for a long time.

[0008] In order to achieve the above object, the present invention adopts the following technical solutions:

[0009] A slurry 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, and a plurality of filters are provided in the housing;

[0010] 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.

[0011] Preferably, a through hole is provided on the lower baffle, and a filter inlet is provided at the bottom of the filter, and the through hole and the filter inlet cooperate with each other.

[0012] Preferably, the liquid inlet is close to the lower baffle, and the discharge port is located in the center of the bottom of the shell.

[0013] Preferably, the liquid outlet is close to the lower baffle.

[0014] Preferably, there are multiple backwash ports, which are symmetrically arranged along the axis of the shell.

[0015] 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.

[0016] Preferably, the first filter screen and the second filter screen are both porous mesh structures.

[0017] Preferably, the mesh diameters of the first filter screen and the second filter screen are smaller than the diameter of the filter ball.

[0018] Preferably, guide columns are provided on both the first guide layer and the second guide layer.

[0019] Preferably, along the direction from outside to inside, the gap between two adjacent guide columns first decreases and then increases.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] 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.

[0022] 2) The slurry catalyst separation and filtration 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.

[0023] 3) The present invention provides a slurry catalyst separation and filtration device. After a period of use, filter cake will accumulate on the surface of the filter ball, affecting the filtration effect. At this time, a flushing liquid is pulsed into the backwash port. The flushing liquid drives the filter ball to roll, which can cause the filter cake on the surface of the filter ball to peel off, thereby achieving a good backwashing effect, effectively extending the service life of the filter, reducing the filter operating cost, and enabling the slurry filtration system to operate stably for a long time. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] 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.

[0025] Figure 1 The backwash catalyst separation and filtration device provided by the present invention;

[0026] Figure 2 is a top view of the filter 8;

[0027] Figure 3 is a structural diagram of the second guide layer 805;

[0028] Figure 4 for Figure 3 AA-directed view in the middle;

[0029] Figure 5 for Figure 4 Enlarged view of E.

[0030] In the figure, 1. outer shell; 2. lower baffle; 201. through hole; 3. upper baffle; 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. DETAILED DESCRIPTION

[0031] 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.

[0032] 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.

[0033] 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.

[0034] Unless otherwise specified, the chemical reagents and materials in the present invention are purchased from commercial sources or synthesized from commercially purchased raw materials.

[0035] like Figures 1 to 5 As shown, the present invention provides a slurry catalyst separation and filtration device, 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 flushing liquid is introduced during the backwashing period; a filter 8 is provided in the shell 1, and the number of the filters can be multiple.

[0036] 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 .

[0037] 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.

[0038] Furthermore, a 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 through hole 201 and the filter inlet 806 cooperate with each other.

[0039] 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.

[0040] 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.

[0041] 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.

[0042] The present invention will be further described below with reference to specific examples.

[0043] Example 1

[0044] A slurry catalyst separation and filtration device includes a shell 1, a lower baffle 2 and an upper baffle 3 are provided in the shell 1, a through hole 201 is opened on the lower baffle 2, 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 symmetrically arranged in 4 directions along the axis of the shell 1.

[0045] 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 It is a porous mesh structure 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, and along the direction from the outside to the inside, the gap between the two adjacent guide columns 807 first decreases and then increases, and 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 through hole 201 cooperates with the filter inlet 806.

[0046] Working principle: During filtration, the discharge port 5 is closed, and 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. The slurry flow rate is increased through the gaps between the guide columns 807 on the first guide layer 801, and the slurry enters the first filter screen 802, the filter ball 803, and the second filter screen 804 for filtration, and then flows out from the second guide layer 805. After filtration, the catalyst powder remains inside the filter element 8 and drops to the bottom of the outer shell 1 due to 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.

[0047] During backwashing, flushing liquid is introduced from the backwash port 7. The flushing liquid passes through the gaps between the guide columns 807 on the second guide layer 805, increasing the flow rate of the flushing liquid to flush the second filter screen 804, the filter balls 803, and the first filter screen 802. The accelerated flushing liquid can loosen the filter cake between the filter screen and the filter balls 803, causing the filter cake to peel off. The filter cake flows out of the first guide layer 801 along with the flushing liquid, settles to the bottom of the shell 1 due to gravity, and is discharged through the discharge port 5. The backwash water is discharged from the liquid inlet 4.

[0048] 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 slurry catalyst separation and filtration 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), and a plurality of filters (8) are provided in 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 through hole (201) is provided on the lower baffle (2), and a filter inlet (806) is provided at the bottom of the filter (8), and the 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 The liquid inlet (4) is close to the lower baffle (2), and the discharge port (5) is located at the center of the bottom of the shell (1).

4. The separation and filtration device according to claim 1, characterized in that 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 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).

7. 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.

8. 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).

9. 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).

10. The separation and filtration device according to claim 9, characterized in that: Along the direction from outside to inside, the gap between two adjacent guide columns (807) first decreases and then increases.

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