Oil-water separation device for petroleum wastewater

Abstract

The utility model provides a petroleum wastewater oil-water separation device which is connected with a discharge port of a mixer, the mixer is used for mixing and reacting oil dirt in petroleum wastewater with air and a flocculating agent to form scum, the device comprises an air floatation tank, one end of the air floatation tank is connected with the discharge port of the mixer through a conveying pipeline, and the other end of the air floatation tank is provided with a receiving hopper; a scum scraping mechanism is arranged at the top of the air floatation tank; the dredging mechanism comprises a push block, a connecting plate and a reciprocating mechanism, the connecting plate is connected with the push block, the connecting plate is slidably connected in a vertically arranged sliding sleeve, the sliding sleeve is fixed in the receiving hopper through a transverse plate, the reciprocating mechanism is arranged at the other end of the air floatation tank, and when the connecting plate moves downwards to the maximum limit, the push block enters a slag discharging opening of the receiving hopper, and the slag discharging opening is opened. When the connecting plate moves upwards to the maximum limit, a preset distance is reserved between the push block and the slag discharging opening. The device can dredge the material receiving port in time through the dredging mechanism, so that a large amount of scum is prevented from being accumulated in the receiving hopper to influence the scraping of the scum in the air floatation tank.

Description

Technical Field

[0001] The utility model belongs to the technical field of oily wastewater treatment, in particular to an oil-water separation device for petroleum wastewater. Background Art

[0002] Petroleum is the raw material of many chemical products. In the process of using petroleum raw materials, a lot of oily wastewater will be produced. Oil floats on the surface of the water body, preventing oxygen in the air from dissolving in the water, resulting in a lack of dissolved oxygen in the water body, death of aquatic organisms, hindering photosynthesis of aquatic plants, and even making the water body smelly, which has a great impact on water quality. The oily wastewater needs to be separated from the oil and water and purified before it can be discharged. At present, the oil-water separation of petroleum wastewater usually uses an air flotation device to mix the oil with air and flocculants to form scum, and then scrape the scum into the discharge hopper. However, after the scum scraper of the current air flotation device scrapes the scum into the discharge hopper, because the scum contains a lot of foam and scum, the foam gathers at the slag discharge port of the receiving hopper, which may cause the slag discharge port to be blocked, and then cause a large amount of scum to accumulate in the discharge hopper and cannot be discharged in time. Utility Model Content

[0003] In order to solve the above-mentioned defects of the prior art, the present application provides an oil-water separation device for petroleum wastewater, which converts the oil in the petroleum wastewater into scum and scrapes it into a receiving bucket. The material receiving port can be cleared in time through a clearing mechanism to avoid a large amount of scum accumulation in the receiving bucket, which affects the scraping of scum in the flotation tank.

[0004] In order to achieve the above purpose, the utility model adopts the following technologies:

[0005] An oil-water separation device for petroleum wastewater is connected to the discharge port of a mixer, and the mixer is used to mix the oil in the petroleum wastewater with air and a flocculant to form scum. The device comprises:

[0006] An air flotation tank, one end of which is connected to the discharge port of the mixer through a conveying pipeline, and the other end of the air flotation tank is provided with a receiving bucket for receiving scum, and a scum scraping mechanism is provided on the top of the air flotation tank for scraping the scum in the air flotation tank into the receiving bucket;

[0007] The dredging mechanism includes a push block, a connecting plate, and a reciprocating mechanism. The bottom shape of the push block matches the shape of the discharge port of the receiving bucket. The connecting plate is connected to the push block. The connecting plate is slidably connected in a vertically arranged sliding sleeve. The sliding sleeve is fixed in the receiving bucket through a horizontal plate. The reciprocating mechanism is arranged at the other end of the flotation tank and is used to control the up and down reciprocating movement of the connecting plate. When the connecting plate moves downward to the maximum limit, the push block enters the slag discharge port of the receiving bucket. When the connecting plate moves upward to the maximum limit, the push block has a preset distance from the slag discharge port.

[0008] Furthermore, the top surface of the push block is in an arc shape, which is used to prevent scum from accumulating on the top surface of the push block.

[0009] Furthermore, the reciprocating mechanism includes a rotating shaft and a return spring. The rotating shaft is rotatably connected between a pair of vertical plates, the vertical plates are fixed above the receiving bucket, a protrusion is provided in the middle of the circumference of the rotating shaft, the rotating shaft is connected to a driving assembly, the driving assembly is used to drive the rotating shaft to rotate, the top of the connecting plate is an inclined surface inclined downward toward the flotation tank, one end of the return spring is connected to the horizontal plate, and the other end of the return spring is connected to the connecting plate. When the protrusion rotates to the bottom, the protrusion pushes the connecting plate to move downward to the maximum limit, and the return spring is in a stretched state. When the protrusion rotates to break away from the abutment relationship with the connecting plate, the return spring drives the connecting plate to move upward to the maximum limit.

[0010] Furthermore, the scum scraping mechanism includes a rotating belt, a pair of transmission shafts, and a scraper. The pair of transmission shafts are rotatably connected between two pairs of support plates, the support plates are fixed to the side walls of the flotation tank, the rotating belt is sleeved outside the pair of transmission shafts, an output shaft of a motor passes through a support plate and is connected to the transmission shaft, the scraper is connected to the outside of the rotating belt, the length directions of the transmission shaft and the scraper are parallel to the axial direction of the rotating shaft, the driving assembly includes a first transmission wheel, a second transmission wheel, and a transmission belt. The first transmission wheel is coaxially connected to a transmission shaft, the second transmission wheel is coaxially connected to the rotating shaft, and the transmission belt is sleeved outside the first transmission wheel and the second transmission wheel.

[0011] Furthermore, the diameter of the second transmission wheel is greater than the diameter of the first transmission wheel.

[0012] The beneficial effects of the utility model are:

[0013] 1. After the oil in the petroleum wastewater is formed into scum and scraped into the receiving bucket, the receiving port can be cleared in time through the dredging mechanism to avoid a large amount of scum accumulation in the receiving bucket, which affects the scraping of scum in the flotation tank.

[0014] 2. The dredging mechanism and the scum scraping mechanism can be driven simultaneously by the same power source, thereby improving energy utilization efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a three-dimensional diagram of the overall structure of the device according to the embodiment of the present application.

[0016] Figure 2 for Figure 1 Enlarged view of part A in the middle.

[0017] Figure 3 This is a stereoscopic diagram of the overall structure of the device according to an embodiment of the present application from another perspective.

[0018] Figure 4 It is a top view of the device according to an embodiment of the present application.

[0019] Figure 5 It is a partial structural stereogram of the device according to the embodiment of the present application.

[0020] Figure numerals: mixer-1, flotation tank-2, receiving bucket-3, slag scraping mechanism-4, push block-5, return spring-6, conveying pipeline-201, slag discharge port-301, rotating belt-401, transmission shaft-402, scraper-403, motor-404, connecting plate-501, sliding sleeve-502, cross plate-503, rotating shaft-504, first transmission wheel-505, second transmission wheel-506, transmission belt-507, protrusion-5041, inclined surface-5011. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solutions and advantages of the embodiments of the utility model clearer, the implementation methods of the utility model are described in detail below in conjunction with the accompanying drawings, but the embodiments described in the utility model are only part of the embodiments of the utility model, rather than all the embodiments.

[0022] The embodiment of the present application provides a petroleum wastewater oil-water separation device, which is connected to the discharge port of the mixer 1, such as Figure 1-Figure 5 As shown, the device includes an air flotation tank 2, a scum scraping mechanism 4, a dredging mechanism, etc.

[0023] Specifically, the mixer may be a vortex three-phase mixer disclosed in application number CN201920955611.X, which is used to mix the oil in the petroleum wastewater with air and flocculant to form scum;

[0024] Specifically, one end of the flotation tank 2 is connected to the discharge port of the mixer 1 through a conveying pipe 201, and a receiving bucket 3 is provided at the other end of the flotation tank 2. The top height of the receiving bucket 3 is used to receive scum, and a scum scraping mechanism 4 is provided on the top of the flotation tank 2, which is used to scrape the scum in the flotation tank 2 into the receiving bucket 3; the dredging mechanism includes a push block 5, a connecting plate 501, and a reciprocating mechanism. The bottom shape of the push block 5 matches the shape of the discharge port of the receiving bucket 3. The connecting plate 501 is connected to the push block 5. The connecting plate 501 is slidably connected to a vertically arranged sliding sleeve 502, and the sliding sleeve 502 is fixed in the receiving bucket 3 through a horizontal plate 503. The reciprocating mechanism is provided at the other end of the flotation tank 2, and is used to control the reciprocating movement of the connecting plate 501 up and down. When the connecting plate 501 moves downward to the maximum limit, the push block 5 enters the slag discharge port 301 of the receiving bucket 3, and when the connecting plate 501 moves upward to the maximum limit, the push block 5 has a preset distance from the slag discharge port 301.

[0025] In actual use, waste water is sent into the mixer 1, and the oil in it is mixed with air and flocculant to react to form scum, which is then discharged into the flotation tank 2. The scum will float in the upper layer due to its low density, and then the scum scraping mechanism 4 is started to scrape the scum into the receiving bucket 3. At the same time, the reciprocating mechanism is controlled to drive the connecting plate 501 and the push block 5 to move up and down, so that the scum gathered at the slag discharge port 301 can be pushed out of the slag discharge port, so as to avoid a large amount of scum accumulation in the discharge hopper, which cannot be discharged in time and affects the scraping of scum in the flotation tank 2. For details, refer to Figure 5 The top surface of the push block 5 is in an arc shape. Compared with the horizontal top surface, the scum will slide downward on the arc-shaped top surface, which can prevent the scum from accumulating in large quantities on the top surface of the push block 5.

[0026] Specifically, the reciprocating mechanism may be a cylinder. In one embodiment, refer to Figure 1-Figure 2 , Figure 4-Figure 5 , a reciprocating mechanism may be provided, including a rotating shaft 504 and a return spring 6. The rotating shaft 504 is rotatably connected between a pair of vertical plates, the vertical plates are fixed above the receiving bucket 3, a protrusion 5041 is provided in the middle of the peripheral side of the rotating shaft 504, the rotating shaft 504 is connected to a driving assembly, the driving assembly is used to drive the rotating shaft 504 to rotate, the top of the connecting plate 501 is an inclined surface 5011 inclined downward toward the flotation tank 2, one end of the return spring 6 is connected to the horizontal plate 503, and the other end of the return spring 6 is connected to the connecting plate 501. When the protrusion 5041 rotates to the bottom, the protrusion 5041 pushes the connecting plate 501 to move downward to the maximum limit, and the return spring 6 is in a stretched state. When the protrusion 5041 rotates to break away from the abutment relationship with the connecting plate 501, the return spring 6 drives the connecting plate 501 to move upward to the maximum limit. The driving assembly drives the rotating shaft 504 to rotate in one direction to drive the protrusion 5041 to rotate, thereby pushing the connecting plate 501 to move in the vertical direction.

[0027] For details, see Figure 1 The scum scraping mechanism 4 includes a rotating belt 401, a pair of transmission shafts 402, and a scraper 403. The pair of transmission shafts 402 are respectively rotatably connected between two pairs of support plates, and the support plates are fixed to the side walls of the flotation tank 2. The rotating belt 401 is sleeved outside the pair of transmission shafts 402. The output shaft of a motor 404 passes through a support plate and is connected to the transmission shaft 402. The scraper 403 is connected to the outside of the rotating belt 401. The length directions of the transmission shaft 402 and the scraper 403 are parallel to the axial direction of the rotating shaft 504.

[0028] For more details, see Figure 1The driving assembly includes a first transmission wheel 505, a second transmission wheel 506, and a transmission belt 507. The first transmission wheel 505 is coaxially connected to a transmission shaft 402, and the second transmission wheel 506 is coaxially connected to the rotating shaft 504. The transmission belt 507 is sleeved outside the first transmission wheel 505 and the second transmission wheel 506. When the motor 404 drives the transmission shaft 402 to rotate, it will drive the rotating belt 401 and the scraper 403 to rotate, and the scum will be scraped into the receiving bucket 3. At the same time, the transmission shaft 402 will drive the first transmission wheel 505 to rotate. The first transmission wheel 505 drives the second transmission wheel 506 to rotate through the transmission belt 507 to drive the rotating shaft 504. The dredging mechanism and the scum scraping mechanism 4 can be driven simultaneously by a power source of the motor 404.

[0029] Because the dredging of the slag discharge port 301 only needs to be done once at a certain interval, frequent dredging is not required. Figure 1 The diameter of the second transmission wheel 506 can be set to be larger than the diameter of the first transmission wheel 505, so that the rotation speed of the second transmission wheel 506 is lower than the rotation speed of the first transmission wheel 505, which can reduce the reciprocating movement frequency of the push block 5.

[0030] The above are only some of the embodiments listed in this application and are not intended to limit this application.

Claims

1. A device for separating oil from water in petroleum wastewater, connected to the discharge port of a mixer (1), the mixer (1) being used to mix oil in the petroleum wastewater with air and a flocculant to form scum, characterized in that the device include: An air flotation tank (2) is connected at one end to a discharge port of the mixer (1) via a conveying pipe (201), and a receiving bucket (3) is provided at the other end of the air flotation tank (2). The receiving bucket (3) is used to receive scum, and a scum scraping mechanism (4) is provided at the top of the air flotation tank (2) for scraping scum in the air flotation tank (2) into the receiving bucket (3); The dredging mechanism comprises a push block (5), a connecting plate (501), and a reciprocating mechanism. The bottom shape of the push block (5) matches the shape of the discharge port of the receiving bucket (3). The connecting plate (501) is connected to the push block (5). The connecting plate (501) is slidably connected to a vertically arranged sliding sleeve (502). The sliding sleeve (502) is fixed to the receiving bucket (3) through a transverse plate (503). The reciprocating mechanism is arranged at the other end of the flotation tank (2) and is used to control the upward and downward reciprocating movement of the connecting plate (501). When the connecting plate (501) moves downward to the maximum limit, the push block (5) enters the slag discharge port (301) of the receiving bucket (3). When the connecting plate (501) moves upward to the maximum limit, the push block (5) and the slag discharge port (301) have a preset distance.

2. The oil-water separation device for petroleum wastewater according to claim 1, characterized in that: The top surface of the push block (5) is in an arc shape, which is used to prevent scum from accumulating on the top surface of the push block (5).

3. The oil-water separation device for petroleum wastewater according to claim 1, characterized in that: The reciprocating mechanism comprises a rotating shaft (504) and a return spring (6). The rotating shaft (504) is rotatably connected between a pair of vertical plates, the vertical plates are fixed above the receiving bucket (3), a protrusion (5041) is provided in the middle of the peripheral side of the rotating shaft (504), the rotating shaft (504) is connected to a driving assembly, the driving assembly is used to drive the rotating shaft (504) to rotate, the top of the connecting plate (501) is an inclined surface (5011) inclined downward toward the air flotation tank (2), one end of the return spring (6) is connected to the horizontal plate (503), and the other end of the return spring (6) is connected to the connecting plate (501), when the protrusion (5041) rotates to the bottom, the protrusion (5041) pushes the connecting plate (501) to move downward to the maximum limit, and the return spring (6) is in a stretched state, and when the protrusion (5041) rotates to break away from the abutment relationship with the connecting plate (501), the return spring (6) drives the connecting plate (501) to move upward to the maximum limit.

4. The oil-water separation device for petroleum wastewater according to claim 3 is characterized in that: The scum scraping mechanism (4) comprises a rotating belt (401), a pair of transmission shafts (402), and a scraper (403). The pair of transmission shafts (402) are respectively rotatably connected between two pairs of support plates, the support plates are fixed to the side walls of the flotation tank (2), the rotating belt (401) is sleeved outside the pair of transmission shafts (402), an output shaft of a motor (404) passes through a support plate and is connected to the transmission shaft (402), the scraper (403) is connected to the outside of the rotating belt (401), and the transmission shaft (402) is connected to the outside of the rotating belt (401). The length directions of the driving shaft (402) and the scraper (403) are parallel to the axial direction of the rotating shaft (504). The driving assembly comprises a first transmission wheel (505), a second transmission wheel (506), and a transmission belt (507). The first transmission wheel (505) is coaxially connected to a transmission shaft (402), the second transmission wheel (506) is coaxially connected to the rotating shaft (504), and the transmission belt (507) is sleeved outside the first transmission wheel (505) and the second transmission wheel (506).

5. The oil-water separation device for petroleum wastewater according to claim 1, characterized in that: The diameter of the second transmission wheel (506) is greater than the diameter of the first transmission wheel (505).

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