Settling box for filtering crude oil

Abstract

The utility model relates to a settling box for filtering crude oil. The settling box comprises a shell (1), and a crawler loader (4), a sieve plate (3), an annular scraper chain (2) and a grating (5) which are arranged in the shell (1), the sieve plate (3) is transversely arranged on the side portion of a slag inlet of the slagging-off machine (4), the annular scraper chain (2) is arranged around the sieve plate (3) and the slagging-off machine (4), the grid (5) is in a Sudoku shape, an oil passing opening (41) of the slagging-off machine (4) right faces one corner of a Sudoku on the lower middle portion of the shell (1), an oil outlet (101) on the side portion of the shell (1) is located on the front side of the middle of the grid (5), and a circulation opening (50) is formed in the upper portion of the grid (5). Crude oil on the upper side is baffled back and forth according to a certain path, and most of crude oil on the lower side is isolated and is in a standing state, so that the crude oil and oil residue separation effect is enhanced.

Description

Technical Field

[0001] The utility model relates to a filtering device, in particular to the structure of a settling tank for filtering crude oil. Background Art

[0002] Imported rapeseed contains about 41-46% oil. In the process of oil production, a combination process of physical pressing and solvent extraction is required; at present, most domestic oil mills use domestic oil presses for physical pressing, and about 13%-20% oil residues need to be removed from the crude oil pressed out.

[0003] The process of removing oil residues includes two-stage filtration. Among them, the first-stage filtration requires the use of a settling tank. The inside of the settling tank is provided with a slag scraper, a sieve plate, and an annular scraper chain driven by a motor, which have a coarse filtration function. The crude oil first enters the slag scraper for coarse filtration, and the separated oil enters the lower part of the settling tank for sedimentation, that is, the crude oil and the oil residues in it are separated by gravity sedimentation. After sedimentation, the crude oil separated from the upper layer can be pumped to the second-stage filtration equipment (horizontal centrifuge or leaf filter) for further fine filtration, and then can be sent to an oil tank for storage or directly sent to a refining workshop to produce degummed oil; the oil residues separated at the bottom of the settling tank are lifted and pushed by the settling tank scraper, move along the sieve plate, and finally return to the slag scraper to continue separating the crude oil, forming a cycle.

[0004] However, due to the overly simple internal structure of the existing settling tank, the flow rate of the crude oil is very fast under the action of pump suction, which is not conducive to the sedimentation separation of oil residues, resulting in insufficient sedimentation time when the crude oil is pumped out of the settling tank and still containing a large amount of oil residues. The high content of oil residues in the crude oil obtained by the first-stage filtration will increase the load of the second-stage filtration equipment, and then lead to higher power consumption and steam consumption of the second-stage filtration equipment. This will not only increase the production cost of enterprises, but also go against the national green development policy of low-carbon, energy-saving and environmental protection. Summary of the Utility Model

[0005] The purpose of the utility model is to solve the problems that the internal structure of the existing settling tank for filtering crude oil is too simple, the flow rate of the crude oil in the settling tank is fast, the crude oil still contains a large amount of oil residues when pumped out of the settling tank, and the filtration effect is poor.

[0006] For the above purpose, the utility model provides a settling tank for filtering crude oil.

[0007] The settling tank for filtering crude oil has a cubic housing 1. An oil outlet 101 is arranged on the side of the housing 1, and a slag scraper 4, a sieve plate 3 for filtering oil residues, an annular scraper chain 2, and a grille 5 are arranged inside. An oil residue conveyor and a motor 21 are arranged outside.

[0008] The slag scraper 4 is arranged on the upper left side of the housing 1, and the rear end passes through the housing 1 and is connected to the conveyor. The upper side of the outer shell of the slag scraper 4 is open to form a slag inlet, and an oil passing port 41 is arranged on the lower side and is open.

[0009] The sieve plate 3 is horizontally arranged on the side of the slag inlet of the slag scraper 4.

[0010] The annular scraper chain 2 is close to the inner side wall of the housing 1, arranged around the sieve plate 3 and the slag scraper 4, and is driven by the motor 21 to rotate.

[0011] The grille 5 is arranged in the middle and lower part of the housing 1, surrounded by the annular scraper chain 2. The grille 5 is in the shape of a nine-square grid formed by the interpenetration of four mutually parallel and upright longitudinal partition plates 53a, 53b, 53c, 53d and two mutually parallel and upright transverse partition plates 54a, 54b, dividing the lower part of the housing 1 into nine small spaces.

[0012] The oil passing port 41 of the slag scraper 4 is directly opposite to the small space 5A located at the front left.

[0013] The oil outlet 101 on the side of the housing 1 is directly opposite to the upper middle part of the small space 5B located in the middle of the front side of the oil passing port 41.

[0014] A plurality of flow ports 50 for controlling the flow direction of the crude oil are arranged above the grille 5, so that the crude oil located above the grille 5 first flows to the left rear side, then to the right rear side, and then to the oil outlet 101.

[0015] During use, first, the crude oil obtained by physical pressing and containing a large amount of oil residues is injected into the slag scraper 4 to filter out most of the oil residues. Then, the crude oil will fall from the oil passing port 41 to the small space 5A at the corner of the front left of the nine-square grid shape, and then diffuse from the lower end of the grille 5 to the entire lower part of the housing 1. After sufficient sedimentation, it is discharged from the oil outlet 101.

[0016] In the above process, the grille 5 can play a role in restricting the flow of the crude oil. Except for the crude oil at the height of the flow ports 50 at the upper end of the grille 5 that can flow under the action of the oil pump, the crude oil in each small space is in a static state, which is more conducive to the sedimentation separation of the crude oil and the oil residues.

[0017] Therefore, the crude oil at the height of the flow ports 50 above the grille 5 can flow along a certain path, that is, it reciprocates and flows on the upper side of the grille 5, extending the flow path of this crude oil, preventing the crude oil that has not been fully sedimented from flowing out short-circuited, and can significantly enhance the separation effect of the crude oil and the oil residues.

[0018] Preferably, the height of the longitudinal partition plate 53a close to the upward lifting side of the annular scraper chain 2 is greater than that of the other longitudinal partition plates 53b, 53c, 53d, and cooperates with the inner side wall of the housing 1 to enclose a lifting channel 202 for preventing the oil residues from falling from the annular scraper chain 2 and increasing the lifting efficiency.

[0019] Preferably, a liquid level gauge is installed on the side of the housing 1, and each flow port 50 is a notch located at the upper end of the grille 5, so as to ensure that the crude oil flowing under the action of the oil pump is the crude oil located at the uppermost end and fully settled, which can avoid the short-circuit flow of the unsettled crude oil, thereby ensuring the separation effect of the crude oil and oil residue.

[0020] Preferably, each flow port 50 is respectively located at the upper side corner of each small space or in the middle position of the upper side edge of each small space, so as to extend the flow path of the crude oil, increase the sedimentation time of the crude oil, and enhance the separation effect of the crude oil and oil residue.

[0021] Preferably, the distance X3 between two adjacent longitudinal partitions 53c and 53d on the side far from the lifting channel 202 is greater than the distances X1 and X2 between other adjacent longitudinal partitions 53c, 53b, and 53a. That is, the volume of the small space on the side far from the lifting channel 202 is larger, so as to provide sufficient buffer space for the crude oil falling from the oil passing port 41, slow down the flow rate of this crude oil, and be conducive to the sedimentation separation of the crude oil and oil residue.

[0022] Preferably, flow ports 50 are respectively arranged in the middle and at the upper right side of the front transverse partition 54a, and flow ports 50 are respectively arranged in the middle and near the upper front side of the second longitudinal partition 53b from the right, so that the crude oil forms a split flow after flowing to the right rear side, and respectively flows to the middle and the right front side of the housing 1 and then to the oil outlet 101. This can further extend the flow path of the crude oil, thereby extending the sedimentation time of the crude oil and enhancing the sedimentation separation effect of the crude oil and oil residue.

[0023] Preferably, a maintenance port is arranged on the longitudinal partition and / or the transverse partition, and a maintenance door 52 for sealing is arranged on the maintenance port. A maintenance door 52 for sealing is arranged on the maintenance port. The staff can perform maintenance on the equipment through the maintenance port.

[0024] Preferably, a side oil tank 10 for buffering is arranged outside the oil outlet 101, and the side oil tank 10 is fixed outside the housing 1 and can play a buffering role.

[0025] Preferably, a pipeline is arranged outside the oil outlet 101, and the crude oil discharged from the oil outlet 101 is pumped to a horizontal centrifuge or a leaf filter through the pipeline. Since the crude oil has a low slag content after primary filtration using the sedimentation tank provided by the present utility model, filtering with a horizontal centrifuge or a leaf filter again can reduce the power consumption and steam consumption of the horizontal centrifuge or the leaf filter, reduce the production cost, and achieve low carbon, energy conservation, and environmental protection.

[0026] Preferably, the distance between the bottom end of the grille 5 and the annular scraper chain 2 is 2-10 cm, so that the process of the annular scraper chain 2 pushing the oil residue will not disturb the crude oil standing in the small space, which can fully strengthen the sedimentation separation time of the crude oil and the oil residue, avoid the short-circuit flow of the crude oil, and enhance the effect of oil residue separation.

[0027] To sum up, the utility model uses the grille 5 in the shape of a nine-square grid to isolate most of the crude oil and make it in a static state, and uses the flow port 50 set at a specific position on the upper end of the grille 5 to control the flow route of the relatively clear crude oil at the top, so that it flows back and forth on the upper side of the grille 5, extending the flow route of these crude oils, preventing the short-circuit outflow of the crude oil that has not been fully sedimented, and significantly enhancing the separation effect of the crude oil and the oil residue. Description of the Drawings

[0028] Figure 1 is an external structure illustration of a sedimentation tank for filtering crude vegetable oil;

[0029] Figure 2 is an internal structure illustration of a sedimentation tank for filtering crude vegetable oil;

[0030] Figure 3 is along Figure 2 the sectional view taken along A-A in

[0031] Figure 4 is a structural illustration of the nine-square grid grille;

[0032] Figure 5 is a process illustration of filtering crude oil. Detailed Description of the Preferred Embodiments

[0033] The embodiments of the present utility model will be described in detail below with reference to the accompanying drawings. The following description is a specific implementation of the claims of the present utility model.

[0034] Embodiment

[0035] Figure 1 and Figure 2 respectively show the external structure and the external structure of a sedimentation tank for filtering crude oil, Figure 3 is along Figure 2 the sectional view taken along A-A in

[0036] Combined with Figure 1 and Figure 2 it can be seen that a sedimentation tank for filtering crude oil has a cubic housing 1, and inside the housing 1, there are a slag scraper 4 ( Figure 2 represented by a dotted line box in

[0037] As Figure 1 shown, an installation opening 14 is formed in the upper part of the front side of the housing 1 to facilitate the installation of the slag raking machine 4. Maintenance openings for maintenance are respectively provided in the upper side and the lower part of the front side of the housing 1, and inspection doors 11 are installed. The motor 21 is fixedly arranged by a frame at the rear of the upper right side of the housing 1.

[0038] An oil outlet 101 for oil discharge, a spare oil outlet 102, a drain port 103, and a measuring port level 104 for installing a liquid level gauge are provided on the front side of the housing 1. A side oil tank 10 for buffering the discharge is also installed on the outer side of the front side of the housing 1 to include the above openings ( Figure 1 only a part of the side oil tank 10 is shown in the figure). A pipeline connecting the side oil tank 10 to a suction pump is provided, and the downstream of the pipeline is connected to a horizontal centrifuge or a leaf filter for secondary filtration (not shown in the figure).

[0039] See Figure 2 and Figure 3 . Figure 2 The slag raking machine 4 is indicated by a dotted line frame in Figure 3 and by cross-hatched lines in

[0040] As Figure 2 and 3 shown, the slag raking machine 4 is arranged above the left side of the housing 1. The upper side of the outer shell of the slag raking machine 4 is open to form a slag inlet, and the lower side is open to provide an oil passing port 41. The crude oil containing oil slag enters the slag raking machine 4 from the slag inlet. After being roughly filtered by the filter screen in the slag raking machine, most of the oil slag remains in the slag raking machine 4. The crude oil and the remaining small part of the oil slag enter the lower part of the housing 1 from the slag raking machine 4 for sedimentation to continue separating the oil slag.

[0041] As Figure 2 and 3 shown, the sieve plate 3 is horizontally arranged on the right side of the slag inlet of the slag raking machine 4, and the annular scraper chain 2 is arranged around the sieve plate 3 and the slag raking machine 4.

[0042] As Figure 3 shown, four rotatable transmission gear shafts 23 are provided at the four corners of the housing 1. The annular scraper chain 2 is supported by these transmission gear shafts 23 in a trapezoidal shape to make it close to the inner side wall of the housing 1. See Figure 1 , and a locking device 231 is provided on one of the transmission gear shafts 23 to keep the annular scraper chain 2 in a taut state.

[0043] As Figure 3 shown, the annular scraper chain 2 is driven to rotate by the motor 21 arranged outside the housing 1, along Figure 3Rotate in the directions indicated by the long arrows B, C, D, and E, that is, it can push the oil residue settled at the bottom of the housing 1 to the side away from the slag skimmer 4 (i.e., the direction indicated by the long arrow D), then lift it to the upper side of the sieve plate 3 (i.e., the direction indicated by the long arrow E), and then push it to the slag skimmer 4 (i.e., the direction indicated by the long arrow B). In this way, the oil residue can be collected to the greatest extent, and it is also beneficial to reduce the slag content rate of the crude oil. The motor 21 is a variable-frequency motor. When in use, the rotation speed of the motor 21 should be controlled according to the amount of oil residue passing through the sieve plate 3 to cooperate with the flow rate of the crude oil and strengthen the sedimentation time of the crude oil.

[0044] See Figure 2 , 3 , a grille 5 is provided in the middle and lower part of the inner side of the housing 1.

[0045] Figure 4 The structure of the grille 5 is shown, see Figure 4 , the grille 5 is composed of four upright longitudinal partition plates 53a, 53b, 53c, 53d and two upright transverse partition plates 54a, 54b. Each longitudinal partition plate is parallel to each other, each transverse partition plate is parallel to each other, and the longitudinal partition plates 53a, 53b, 53c, 53d and the transverse partition plates 54a, 54b are perpendicularly inserted and fixed to form a nine-square grid shape. The front and rear ends of the four longitudinal partition plates are respectively fixed on the inner side walls of the front and rear sides of the housing 1, and the space at the lower end of the inside of the housing 1 for sedimenting the crude oil is divided into nine small spaces.

[0046] See Figure 3 , the grille 5 is surrounded by an annular scraper chain 2. The distance between the bottom end of the grille 5 and the annular scraper chain 2 is 5 cm, so that the bottom annular scraper chain 2 can pass under the grille 5 to push away the sedimented and separated oil residue.

[0047] See Figure 3 , the height of the longitudinal partition plate 53a on the side (right side) of the grille 5 close to the upward lift of the annular scraper chain 2 is higher than that of the other longitudinal partition plates, and its upper end height reaches the turning point of the annular scraper chain 2. The longitudinal partition plate 53a and the inner side wall of the housing 1 cooperate to enclose a lifting channel 202 for lifting the oil residue, and the distance from the annular scraper chain 2 is 2 cm, which can prevent the oil residue from falling from the annular scraper chain 2 and increase the lifting efficiency.

[0048] As Figure 4 shown, the lengths of the three small spaces on the side away from the upward lift of the annular scraper chain 2 are greater than those of the other small spaces, that is, Figure 4 X3 in

[0049] An inspection opening for facilitating the passage of staff is provided on the longitudinal partition board, and an inspection door 52 for sealing is provided on the inspection opening.

[0050] Figure 5 The process flow of filtering crude vegetable oil is shown, and the position of the grid 5 in the housing 1 is also shown from a top-down perspective. In combination Figure 3 viewing, the oil passing port 41 of the slag scraping machine 4 is facing the small space at the front left corner of the nine-square grid shape ( Figure 5 the small space 5A in it), and the oil outlet 101 on the housing 1 is located in the upper middle part of the outside of the small space connected to the small space ( Figure 5 the small space 5B in it), that is, in the middle of the front side of the housing 1 as shown in Figure 3 .

[0051] As Figure 4 shown, eight flow ports 50 (50a…50i) for controlling the flow direction of the crude oil are provided at the upper end of the grid 5, that is, square openings provided on the upper parts of the longitudinal partition boards 53a, 53b, 53c, 53d and the transverse partition boards 54a, 54b. Each flow port 50 is respectively located at the upper side corner or the middle position of the upper side edge of each small space, and the flow ports 50 on the upper side of each small space are respectively located at the opposite side or both ends of the diagonal line, so as to extend the flow path of the crude oil.

[0052] During use, first, the crude oil containing a large amount of oil residue obtained by physical pressing is injected into the slag scraping machine 4 to filter out most of the oil residue. After that, the crude oil will fall from the oil passing port 41 to the small space at the front left corner of the nine-square grid shape ( Figure 5 the small space 5A in it), and then spread from the lower end of the grid 5 to the lower part of the entire housing 1. When the liquid level of the crude oil rises to Figure 3 the working liquid level O1 indicated by the dotted line in it, that is, the middle position of the flow port 50, the oil pump is started to pump the crude oil from the oil outlet 101 to the side oil tank 10 for buffering, so that the liquid level of the crude oil is maintained at the working liquid level O1.

[0053] During the above process, as Figure 5 shown, the crude oil at the height of the flow port 50 at the upper end of the grid 5 can first flow left and backward through the flow ports 50b, 50c, and then flow right and forward through the flow ports 50d, 50e. After that, it forms two branches through the flow port 50f. One branch flows from the flow ports 50g, 50a to the middle of the lower part of the housing 1, and one branch flows from the flow ports 50h, 50i to the right side, and then flows to the oil outlet 101

[0054] (that is, the front side) respectively. The above flow route is the longest route obtained through current production tests, which can avoid affecting the filtering effect due to the short circuit of the crude oil to the greatest extent.

[0055] Since the grille 5 can restrict the flow of crude oil, except for the crude oil at the height of the upper circulation port 50 of the grille 5 that can flow under the action of the oil pump, the crude oil in each small space is in a static state, which is more conducive to the sedimentation separation of crude oil and oil residue.

[0056] The separated oil residue falls to the bottom of the housing 1, is pushed by the annular scraper chain 2 to the side away from the slag scraper 4, then lifted to the upper side of the sieve plate 3, and finally pushed to the slag scraper 4 to continue filtering out the crude oil.

[0057] Since the volume of the small space on the side far from the lifting channel 202 is relatively large, it can provide sufficient buffer space for the crude oil falling from the oil passing port 41, slow down the flow rate of this crude oil, and is conducive to the sedimentation separation of crude oil and oil residue.

[0058] Since the distance between the bottom end of the grille 5 and the annular scraper chain 2 is very close, only 5 cm in this embodiment, the process of the annular scraper chain 2 pushing the oil residue will not disturb the static crude oil in the small space, can fully strengthen the sedimentation separation time of crude oil and oil residue, avoid the short-circuit flow of crude oil, and enhance the effect of oil residue separation.

[0059] In summary, the utility model uses the grille 5 in the shape of a nine-square grid to isolate most of the crude oil and keep it in a static state, and uses the circulation port 50 set at a specific position on the upper end of the grille 5 to control the flow path of the relatively clear crude oil at the top, making it flow back and forth above the grille 5, extending the flow path of this crude oil, preventing the short-circuit outflow of the crude oil that has not been fully sedimented, and can significantly enhance the effect of separating crude oil and oil residue.

[0060] Verified by actual production, the oil residue content in the crude oil obtained by using the sedimentation tank provided in this embodiment for the first-stage filtration is less than 2%, while the oil residue content in the crude oil obtained by using the traditional sedimentation tank for the first-stage filtration is 6 - 8%. After being put into production, the daily production capacity is increased, and the production steam and power consumption are significantly reduced. Therefore, the utility model is beneficial to reducing the production cost of the enterprise, enhancing the market competitiveness, and helping the enterprise to develop with high quality.

Claims

1. A settling box for filtering crude oil, characterized in that: A cubic shell (1) is provided with an oil outlet (101) on the side of the shell (1), a slag scraper (4), a screen plate (3) for filtering oil residue, an annular scraper chain (2), and a grille (5) are provided inside, and a conveyor and a motor (21) are provided outside. The scraper (4) is arranged on the left side of the upper part of the shell (1), and the rear end thereof passes through the shell (1) and is connected to the conveyor. The upper side of the shell of the scraper (4) is open to form a slag inlet, and the lower side is open to form an oil outlet (41). The screen plate (3) is arranged transversely on the side of the slag inlet of the slag scraper (4). The annular scraper chain (2) is disposed close to the inner wall of the housing (1), surrounding the screen plate (3) and the scraper (4), and is driven to rotate by a motor (21). The grille (5) is arranged in the middle and lower part of the shell (1) and is surrounded by the annular scraper chain (2). The grille (5) is in the shape of a nine-square grid formed by four mutually parallel upright longitudinal partitions (53a, 53b, 53c, 53d) and two mutually parallel upright transverse partitions (54a, 54b), dividing the lower part of the shell (1) into nine small spaces. The oil passage port (41) of the scraper (4) is directly opposite to the small space located on the front left side. The oil outlet (101) on the side of the housing (1) faces the middle and upper part of the small space located in the middle of the front side of the oil outlet (41). The upper portion of the grid (5) is provided with a plurality of flow openings (50) for controlling the flow direction of the crude oil, so that the crude oil located at the upper portion of the grid (5) first flows to the left rear side, then flows to the right rear side, and then flows to the oil outlet (101).

2. The settling box for filtering crude oil according to claim 1, characterized in that: The longitudinal partition plate (53a) located near the upward lifting side of the annular scraper chain (2) has a height greater than that of the other longitudinal partition plates (53b, 53c, 53d), and cooperates with the inner side wall of the shell (1) to form a lifting channel (202).

3. The sedimentation tank for filtering crude oil according to claim 1, characterized in that: Each of the flow openings (50) is a notch located at the upper end of the grille (5).

4. The settling box for filtering crude oil according to claim 3, characterized in that: Each of the flow openings (50) is located at an upper corner of each small space or in the middle of an upper side of each small space.

5. The sedimentation box for filtering crude oil according to claim 2, characterized in that: The distance (X3) between two adjacent longitudinal partitions (53c, 53d) located on a side away from the lifting channel (202) is greater than the distance (X1, X2) between other adjacent longitudinal partitions (53c, 53b, 53a).

6. The settling box for filtering crude oil according to claim 4, characterized in that: The middle part and the upper right side of the transverse partition (54a) located on the front side are respectively provided with flow openings (50), and the middle part and the upper end close to the front side of the second longitudinal partition (53b) located on the right side are respectively provided with flow openings (50), so that the crude oil flows to the right rear side and then forms a split flow, and the split flow flows to the middle part and the right front side of the shell (1) and then flows to the oil outlet (101) respectively.

7. The sedimentation box for filtering crude oil according to any one of claims 1 to 6, characterized in that: The longitudinal partition and / or the transverse partition is provided with an inspection opening, and the inspection opening is provided with an inspection door (52) for sealing.

8. The sedimentation box for filtering crude oil according to any one of claims 1 to 6, characterized in that: A side oil tank (10) for buffering is arranged outside the oil outlet (101), and the side oil tank (10) is fixed on the outside of the housing (1).

9. The settling box for filtering crude oil according to claim 8, characterized in that: A pipeline is arranged outside the oil outlet (101), and the crude oil discharged from the oil outlet (101) is pumped to a horizontal centrifuge or a blade filter through the pipeline.

10. The sedimentation box for filtering crude oil according to any one of claims 1 to 6, characterized in that: The distance between the bottom end of the grille (5) and the annular scraper chain (2) is 2 to 10 cm.

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