An integrated separator for treating wastewater containing silt and oil on board

Abstract

The present invention is an integrated separator for treating silt-containing oily water for use on ships, comprising an outer cylinder fixedly connected to a conical silt hopper, an inner cylinder also arranged in the cavity of the outer cylinder, a through hole connected to the outer cylinder at the top of the inner cylinder, a partition plate for dividing the inner cylinder into an upper chamber and a lower chamber is arranged in the lower half, an inclined plate assembly is arranged below the inner cylinder, a coalescing filter is arranged between the inner and outer cylinder walls above the inclined plate assembly, an inlet pipe is arranged vertically downward after extending from the outer cylinder wall into the inner cylinder, and its outlet end extends to below the isolation plate of the inner cylinder; an outlet pipe is arranged vertically downward after extending from the outer cylinder wall into the inner cylinder, and its inlet end is close to the upper surface of the isolation plate of the inner cylinder. The present invention utilizes inertia to remove coarse particles in silt-containing oily water, adopts an inclined plate assembly to remove fine particles and coalesce oil particles, and adopts a coalescing filter to further coalesce and enlarge the oil particles for easy removal.

Description

Technical Field

[0001] The present invention relates to a marine oil-water separator, and in particular discloses an integrated separator for treating marine sewage containing sediment and oil. The separator is mainly used in the separation and recycling system of deck flushing and drainage water, drilling mud treatment water, and produced water, and is used to separate solid impurities and oil from water. Background Art

[0002] Deck washwater and drilling mud treatment water typically contain not only oil but also large amounts of impurities such as silt and sand. These impurities can easily clog the oil-water separation system, increasing maintenance frequency. Furthermore, when fine solid particles clumped together with oil particles and had a specific gravity close to that of water, they were difficult to separate by gravity alone, significantly reducing oil-water separation efficiency. Furthermore, fine solid particles not removed by the separation system can affect the accuracy of oil content meters, causing high ppm readings and further impacting the operation of the separation system.

[0003] In order to meet the requirements of space occupation and easy maintenance of control equipment on ships, based on the Stokes principle, combined with basic physical laws such as specific gravity, speed, inertia, friction, etc., a silt and oil-containing wastewater separator with a compact structure and good treatment effect has been developed, which has become a technical problem that must be solved.

[0004] Based on the Stokes principle, gravity separators are typically equipped with inclined plates to accelerate the aggregation and separation process. However, the separation speed of oil particles floating up and solid particles sinking down is not only related to the specific gravity and size of the oil and particles, but is also affected by the friction of the inclined plates and the flow rate and direction of the water flow. To prevent the inclined plates from clogging, the spacing between the inclined plates in typical separators in the prior art is usually relatively large, so the friction effect of the inclined plate surface on the particles and oil particles is very limited, and it also takes up a large installation space. If the flow rate accelerates and turbulence occurs when the water leaves the inclined plate, the separated oil / particles will be entrained into the flow channel. If the carrier flow direction is opposite to the direction of oil particles floating up or particles sinking, the separation process will also be slowed down. Summary of the Invention

[0005] The purpose of the present invention is to address the defects of the prior art and design an integrated separator for treating silt-containing oily water on board. By utilizing basic physical laws such as speed, inertia, and friction, the existing separator structure is improved. The separator can efficiently treat silt-containing oily water and cleanly separate solid impurities and oil from the water. The separator has a compact and simple structure, which reduces the maintenance workload of the equipment.

[0006] The present invention is realized as follows: an integrated separator for treating sediment-containing oily water on board a ship, characterized in that: the separator comprises an outer cylinder fixedly connected to a conical sediment bucket, wherein the small-diameter end of the conical sediment bucket faces downward, an inner cylinder is further provided in the cavity of the outer cylinder, a through hole communicating with the outer cylinder is provided at the top of the inner cylinder, an isolation plate is provided in the lower half of the inner cylinder to divide the inner cylinder into an upper chamber and a lower chamber, forming a double-layer structure of inner and outer chambers respectively connected at the top and the bottom, an inclined plate assembly is provided below the inner cylinder, and the inclined plate assembly One side of the component rests against the inner wall of the outer cylinder, and the other side rests against the outer wall of the inner cylinder. A coalescing filter is also located between the inner and outer cylinder walls above the inclined plate assembly. The top of the outer cylinder is provided with a sewage inlet and a clean water outlet, respectively. An oil drain port is provided on the top surface of the outer cylinder. The sewage inlet is connected to a water inlet pipe, extending vertically downward from the outer cylinder wall into the inner cylinder, with its outlet end extending below the inner cylinder's isolation plate. The clean water outlet is connected to a water outlet pipe, extending vertically downward from the outer cylinder wall into the inner cylinder, with its water inlet end adjacent to the upper surface of the inner cylinder's isolation plate. The top of the inner cylinder is fixedly connected to the inner top surface of the outer cylinder.

[0007] The inclined plate assembly consists of several inclined plates arranged in a circular array. These plates are 2-5 mm thick, with a gap of 5-25 mm between adjacent plates and an inclination angle of 45° to 60° relative to the horizontal. The upper half of the inclined plate assembly is located between the inner and outer walls of the outer and inner cylinders, while the lower half leads to a conical silt hopper. The conical silt hopper is fixed to the outer cylinder via a flange and bolts. The smaller end of the conical silt hopper is connected to the sediment discharge pipeline.

[0008] The sewage inlet, oil outlet, clean water outlet and sediment outlet are respectively provided with flanges for pipeline connection, and the top surface of the outer cylinder is provided with lifting ears.

[0009] The beneficial effects of the present invention are as follows: the present invention is a separator for separating solid impurities and oil from water. An inner cylinder is arranged in an outer cylinder to form a double-layer structure of inner and outer cavities connected at the top and bottom respectively. When the sewage flows out of the water inlet pipe into the separator at a high speed vertically downward, coarse particles are removed by inertia. The water flow then enters the inclined plate assembly between the inner wall of the outer cylinder and the outer wall of the inner cylinder from the side. When the water flows through the inclined plate assembly, the flow rate decreases. The particles slide on the inclined plate assembly to the dead zone of the water flow in the lower half of the inclined plate assembly, and no re-entrainment occurs, thereby avoiding affecting the separation process. The oil particles are sequentially condensed by the dual action of the inclined plate assembly and the condensation filter screen arranged above the inclined plate assembly, and finally gathered at the top of the separator and discharged through the oil discharge port. The isolation plate arranged in the lower half of the inner cylinder divides the inner cylinder into an upper and lower chamber. The clean water after separation enters the upper chamber from the top of the inner cylinder and is then discharged through the outlet pipe. The integrated separator designed in this invention utilizes basic physical laws such as speed, inertia, and friction to efficiently treat silt- and oil-laden wastewater, separating solid impurities and oil from the water. The device has a compact and simple structure and requires little maintenance, meeting the needs of minimizing the footprint of control equipment and simplifying equipment maintenance on ships and offshore platforms. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a schematic diagram of the cross-sectional structure and separation working path flow of the present invention.

[0011] Figure 2 It is a schematic diagram of the separation working principle of the present invention for treating silt-containing oily wastewater.

[0012] Figure: 1. Coalescing filter; 2. Water inlet pipe; 3. Inclined plate assembly; 4. Conical sediment hopper; 5. Isolation plate; 6. Water outlet pipe; 7. Sewage inlet; 8. Oil outlet; 9. Clean water outlet; 10. Sediment outlet;

[0013] A. The area where the flow velocity drops once; B. The dead zone of water flow; C. The area where the flow velocity drops twice. DETAILED DESCRIPTION

[0014] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0015] According to the attached Figure 1The present invention is an integrated separator for treating sediment-laden, oily, and wastewater on board a ship. The separator comprises a cylindrical outer body connected to a conical silt hopper 4 via flanges and bolts. The conical silt hopper 4 has a downwardly oriented small-diameter end connected to a silt discharge pipeline, which discharges the separated silt through a silt discharge port 10. An inner body is disposed within the cavity of the outer body. The top end of the inner body is fixedly connected to the inner top surface of the outer body and is provided with a through hole. A partition plate 5 is disposed within the lower half of the inner body, dividing the inner body into upper and lower chambers, forming a double-layer structure with inner and outer chambers connected at the top and bottom, respectively. A sloping plate assembly 3 is located beneath the inner cylinder. One side of the sloping plate assembly 3 abuts the inner wall of the outer cylinder and the other side of the outer wall. The sloping plate assembly 3 is composed of several sloping plates arranged in a circular array. The sloping plates are 2-5 mm thick, with a gap of 5-25 mm between adjacent plates and an angle of 45-60° relative to the horizontal. The upper half of the sloping plate assembly 3 is located between the inner and outer walls of the outer and inner cylinders, while the lower half leads to a conical sludge hopper 4. A coalescing filter 1 is also located above the sloping plate assembly 3, between the inner and outer walls. A sewage inlet 7 and a clean water outlet 9 are located at the top of the outer cylinder, along with an oil drain port 8. The sewage inlet 7 is connected to a water inlet pipe 2, which extends vertically downward from the outer cylinder wall into the inner cylinder, with its outlet extending below the inner cylinder's partition plate 5. The clean water outlet 9 is connected to a water outlet pipe 6, which extends from the outer cylinder wall into the inner cylinder and then extends vertically downward. Its water inlet is close to the upper surface of the inner cylinder's partition plate 5 to prevent the separated oil from being disturbed when the clean water is discharged. The sewage inlet 7, oil outlet 8, clean water outlet 9, and sediment outlet are each equipped with flanges for pipe connection. To facilitate the lifting of the separator, the top surface of the outer cylinder is equipped with lifting lugs.

[0016] After the silt-laden oily wastewater flows vertically downward out of the water inlet pipe 2 at a high speed, the coarse particles are directly thrown into the conical sedimentation bucket 4. After the water flow slows down and pauses, the water flow enters the inclined plate assembly 3 from the side. The water flow speed further decreases when passing through. The fine particles settle to the surface of the inclined plate assembly 3 at the inclined plate assembly 3, and finally slide down along the surface of the inclined plate assembly 3 and settle to the conical sedimentation bucket 4. The oil particles in the oily wastewater float to the surface of the inclined plate assembly 3, coalesce and become larger, and continue to float up. After passing through the coalescing filter 1 with the water flow, the oil particles coalesce into larger oil particles again, and continue to float to the top of the cylinder and gather. Since the outer cylinder and the top of the inner cylinder of the separator are connected, the oil particles gathered at the top of the cylinder are discharged through the oil discharge port 8 set on the top surface of the outer cylinder, and the separated clean water gathers in the upper chamber of the inner cylinder until it enters the outlet pipe 6 and is discharged from the clean water outlet 9. The water flow direction has undergone two 180° turns during the separation process.

[0017] According to the attached Figure 2 , the working principle of the present invention is as follows:

[0018] After the sediment-laden, oily wastewater flows vertically downward from the inlet pipe 2 at high speed, the flow cross-section increases, the water flow slows, and coarse particles are thrown into the conical sediment hopper 4 at the bottom due to inertia. After the coarse particles are removed, the closely spaced, circular array of inclined plate assemblies 3 reduces the sedimentation distance, thereby increasing the number of inclined plate assemblies 3 and the sedimentation area, and enhancing the friction between the inclined plate assemblies 3 and the fine particles / oil in the water.

[0019] When the silt-laden, oily wastewater enters the inclined plate assembly 3 from its inner side (i.e., entering the primary velocity drop zone A), the flow velocity decreases, allowing fine particles to settle and separate due to gravity and friction on the plate surfaces. The velocity in the direction of the flow in the settling direction is zero, which has no impact on the settling process. After settling, the solid particles enter the dead zone B, preventing re-entrainment. Because the outer gaps between adjacent inclined plates in the inclined plate assembly 3 are larger than the inner gaps, the flow decelerates a second time as it turns from the primary velocity drop zone A into the secondary velocity drop zone C. Buoyancy and friction cause the fine oil particles to coalesce and grow larger on the lower surface of the inclined plate assembly 3, further facilitating gravity separation. Upon exiting the inclined plate assembly 3, the flow area increases again, and the flow velocity decreases again, preventing the formation of turbulent flow and the re-entrainment of fine oil particles. As the flow passes through the coalescing filter 1, the oil particles further coalesce and grow larger. When the water flow rises to the top of the outer cylinder, it turns and enters the inner cylinder. The oil particles that have coalesced and become larger are retained and gathered at the top of the separator under the action of buoyancy, while the clean water flows down along the inner cylinder to the inlet of the water outlet pipe 6 and is discharged from the clean water outlet 9.

Claims

1. An integrated separator for treating wastewater containing sediment and oil on board a ship, characterized by: The separator comprises an outer cylinder fixedly connected to a conical silt bucket, wherein the small-diameter end of the conical silt bucket faces downward, an inner cylinder is also arranged in the cavity of the outer cylinder, a through hole connected to the outer cylinder is opened at the top of the inner cylinder, an isolation plate is arranged in the lower half of the inner cylinder to divide the inner cylinder into an upper chamber and a lower chamber, forming a double-layer structure of inner and outer chambers connected at the top and the bottom respectively, an inclined plate assembly is arranged below the inner cylinder, one side of the inclined plate assembly is against the inner wall of the outer cylinder, and the other side is against the outer wall of the inner cylinder, a coalescing filter is also arranged between the inner and outer cylinder walls above the inclined plate assembly, and the outer A sewage inlet and a clean water outlet are respectively provided on the top of the cylinder, and an oil discharge port is provided on the top surface of the outer cylinder. The sewage inlet is connected to an inlet pipe, which extends from the outer cylinder wall into the inner cylinder and then is arranged vertically downward, and its outlet end extends to below the isolation plate of the inner cylinder. The clean water outlet is connected to an outlet pipe, which extends from the outer cylinder wall into the inner cylinder and then is arranged vertically downward, and its inlet end is located near the surface above the isolation plate of the inner cylinder. The inclined plate assembly is arranged in a circular array by a plurality of inclined plates, the thickness of the inclined plate is 2~5mm, the gap between adjacent inclined plates is 5~25mm, and the inclination angle is 45°~60° with the horizontal plane. The upper half of the inclined plate assembly is arranged between the inner and outer two layers of cylinder walls formed by the outer cylinder and the inner cylinder, and the lower half leads to a conical sludge hopper.

2. The integrated separator for treating wastewater containing sediment and oil on board a ship according to claim 1 is characterized by: The top of the inner cylinder is fixedly connected to the inner top surface of the outer cylinder.

3. The integrated separator for treating wastewater containing sediment and oil on board a ship according to claim 1 is characterized by: The conical sediment bucket is fixedly connected to the outer cylinder through a flange and bolts, and the small-diameter end of the conical sediment bucket is connected to a sediment discharge pipeline.

4. The integrated separator for treating wastewater containing sediment and oil on board a ship according to claim 1 is characterized by: The sewage inlet, oil outlet, clean water outlet and sediment outlet are respectively provided with flanges for pipeline connection, and the top surface of the outer cylinder is provided with lifting ears.

5. The integrated separator for treating wastewater containing sediment and oil on board a ship according to claim 1 is characterized by: The water flow area from the inside of the inclined plate assembly to the outside of the inclined plate assembly is the primary velocity drop area of ​​the silt and oily wastewater. Fine particles settle and separate under the action of gravity and plate surface friction. The velocity of the water flow in the settling direction is zero, which has no effect on the sedimentation process. After the solid particles settle and slide, they enter the water flow dead zone and will not be entrained again. Since the outer gap between adjacent inclined plates of the inclined plate assembly is larger than the inner gap, the water flow turns upward from the primary velocity drop area and enters the secondary velocity drop area. Fine oil particles gather and grow larger on the lower surface of the inclined plate assembly under the action of buoyancy and friction. When the water flow leaves the inclined plate assembly, the flow area increases again and the flow velocity drops again.

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