Offshore platform oily water filtration and treatment device

Abstract

The utility model provides a kind of offshore platform oily sewage filtering treatment device, including front jacking block, coarse filtration jacking block, cyclone air floatation jacking block, depth filtration jacking block and recovery jacking block;Recovery jacking block is located in lower layer, the rest jacking block is located in upper layer, detachable installation between two layers;Between upper and lower jacking block, there is inclined ladder, and there is grating board footpath between jacking block of same layer;Front jacking block carries out pretreatment to oily sewage;Coarse filtration jacking block carries out gravity separation and coarse filtration to the oily sewage after pretreatment;Cyclone air floatation jacking block carries out intermediate oil removal to the oily sewage after coarse filtration;Depth filtration jacking block carries out depth oil removal to liquid phase after intermediate oil removal;Recovery jacking block recycles oil phase separated by coarse filtration jacking block and cyclone air floatation jacking block, and recycles clean water separated by depth filtration jacking block.The offshore platform oily sewage filtering treatment device of the utility model is compact in structure, reasonable in layout, can adapt to the narrow space of offshore platform, and is efficient in processing and convenient in maintenance.

Description

Technical Field

[0001] This utility model belongs to the field of offshore platform oily wastewater treatment technology, and in particular relates to an offshore platform oily wastewater filtration and treatment device. Background Technology

[0002] With the continuous development of offshore oil exploration and development, offshore drilling platforms generate a large amount of oily wastewater during drilling, well washing, and production processes. This wastewater must be treated before it can be discharged or reused. Current technologies for treating oily wastewater from offshore platforms typically employ decentralized equipment or integrated skid-mounted structures, both of which have drawbacks due to the limited space and challenging construction conditions of offshore platforms. Decentralized equipment occupies a large area, has low integration, and is inconvenient to install and maintain. Integrated skid-mounted structures, on the other hand, have low modularity, are inconvenient to construct and transport, and contain unnecessary redundant pipelines and backup equipment. Utility Model Content

[0003] In view of this, in order to solve the above-mentioned technical problems, this utility model proposes an oily wastewater filtration and treatment device for offshore platforms that is easy to transport and install, has a compact structure, a reasonable layout, is adaptable to the narrow space of offshore platforms, has high processing efficiency, and is easy to maintain.

[0004] To achieve the above objectives, the technical solution of this utility model is implemented as follows:

[0005] An oily wastewater filtration and treatment device for offshore platforms includes a pre-filter, a coarse filter, a cyclone flotation, a depth filter, and a recovery skid; the recovery skid is located on the lower layer, and the remaining skids are located on the upper layer, with the two layers being detachable and installable; an inclined ladder is provided between the lower and upper skids, and a grid plate walkway is provided between the skids on the same layer;

[0006] The front skid is used for pretreatment of oily wastewater;

[0007] The coarse filter skid is used for gravity separation and coarse filtration of pretreated wastewater.

[0008] The cyclone flotation skid is used for intermediate oil removal from the coarsely filtered wastewater.

[0009] The depth filter skid is used for deep oil removal of the liquid phase after intermediate oil removal;

[0010] The recovery skid is used to recover the oil phase separated by the coarse filter skid and the cyclone flotation skid, and to recover the clean water separated by the deep filter skid.

[0011] Furthermore, the front skid includes a skid frame, a demulsifying tank integrated on the skid frame, and a dosing tank; the top of the demulsifying tank is provided with an oily wastewater inlet.

[0012] Furthermore, the coarse filter skid includes a second skid frame and an oil skimmer and a CPI separator integrated on the second skid frame; the inlet of the oil skimmer is connected to the outlet of the demulsifying tank, and the outlet of the oil skimmer is connected to the inlet of the CPI separator; the bottom solid waste discharge outlets of the oil skimmer and the CPI separator are connected to an external solid waste treatment system.

[0013] Furthermore, the cyclone flotation skid includes a skid frame three and a cyclone separator and a dissolved air flotation machine integrated on the skid frame three; the inlet of the cyclone separator is connected to the liquid phase outlet of the CPI separator, and the bottom liquid phase outlet of the cyclone separator is connected to the inlet of the dissolved air flotation machine.

[0014] Furthermore, the depth filtration skid includes a skid frame four and a membrane filtration assembly and a depth filter integrated on the skid frame four; the inlet of the membrane filtration assembly is connected to the liquid phase outlet of the dissolved air flotation machine, and the freshwater outlet of the membrane filtration assembly is connected to the inlet of the depth filter.

[0015] Furthermore, the recycling skid includes a skid frame five and an oil phase tank and a clear water tank integrated on the skid frame five; the oil phase outlets of the skid tank, the CPI separator, the cyclone separator, and the dissolved air flotation machine are all connected to the inlet of the oil phase tank; the outlet of the depth filter is connected to the inlet of the clear water tank.

[0016] Furthermore, the clean water outlet of the clean water tank is used to provide clean water to the outside environment, and is also connected to the backwash water inlet of the membrane filtration assembly through a pipeline.

[0017] Furthermore, the backwash wastewater outlet of the membrane filtration assembly and the sedimentation wastewater outlet at the bottom of the oil phase tank are both connected to the inlet of the skimming tank via pipelines.

[0018] Furthermore, the upper side wall of the oil phase tank is provided with an oil phase outlet that is connected to an external oil recovery system.

[0019] Furthermore, all five skids—skid one, skid two, skid three, skid four, and skid five—are H-shaped steel structure frames coated with anti-corrosion coatings, and the steel structures are equipped with instrument and electrical wiring boxes.

[0020] Compared with existing technologies, the offshore platform oily wastewater filtration and treatment device of this utility model has the following advantages:

[0021] (1) The offshore platform oily wastewater filtration and treatment device of this utility model adopts a modular skid design, which divides the treatment unit into upper and lower layers according to the process line. The structure is compact and greatly reduces the floor space, making it particularly suitable for offshore platforms with limited space. The skids can be disassembled and installed, which facilitates transportation, assembly and maintenance, and improves the flexibility and adaptability of the equipment. Inclined ladders and grating walkways are set between each skid, which facilitates daily inspection and maintenance by operators and improves safety and operability.

[0022] (2) The offshore platform oily wastewater filtration and treatment device described in this utility model is divided into multiple skids according to the process route and functions. The functions of each skid are clearly defined, and the modules can be connected by standardized interfaces, so that each module can be manufactured, tested and transported independently. At the same time, through a multi-stage treatment process (pretreatment, coarse filtration, intermediate oil removal and deep filtration), the oily wastewater is efficiently separated, the effluent quality is stable and the oil phase recovery rate is high. Attached Figure Description

[0023] The accompanying drawings, which form part of this utility model, are used to provide a further understanding of the utility model. The illustrative embodiments of the utility model and their descriptions are used to explain the utility model and do not constitute an undue limitation of the utility model. In the drawings:

[0024] Figure 1 This is a schematic diagram of the process of the offshore platform oily wastewater filtration and treatment device according to an embodiment of the present invention;

[0025] Figure 2 This is a top view of the oily wastewater filtration and treatment device for offshore platforms according to an embodiment of the present invention (pipeline wiring, grating walkway, and inclined ladder are not shown).

[0026] Explanation of reference numerals in the attached figures:

[0027] 1-Front-mounted skid, 11-Lancer 1, 12-Damage-breaking tank, 13-Dosing box;

[0028] 2-Coarse filter skid, 21-Skid 2, 22-Skimming tank, 23-CPI separator;

[0029] 3-Swirl flotation skid, 31-Skid three, 32-Swirl separator, 33-Dissolved air flotation machine;

[0030] 4-Depth filter skid, 41-Skid four, 42-Membrane filter assembly, 43-Depth filter;

[0031] 5-Recycling skid, 51-Skid five, 52-Oil phase tank, 53-Clean water tank. Detailed Implementation

[0032] It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0033] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0034] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0035] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0036] like Figure 1 and 2 As shown, an oily wastewater filtration and treatment device for offshore platforms includes a pre-filter skid 1, a coarse filter skid 2, a cyclone flotation skid 3, a depth filter skid 4, and a recovery skid 5. The recovery skid 5 is located on the lower layer, and the remaining skids are located on the upper layer. The two layers are detachably connected by a steel structure. An inclined ladder with guardrails is provided between the lower and upper skids to facilitate maintenance personnel to access the second layer. A grating walkway with guardrails is provided between the skids on the same layer to facilitate maintenance personnel to inspect each skid.

[0037] The front skid 1 includes a skid frame 11, a demulsifying tank 12 integrated on the skid frame 11, and a dosing tank 13; the top of the demulsifying tank 12 is provided with an oily wastewater inlet, and the dosing tank 13 is used to add demulsifier to the demulsifying tank 12;

[0038] The coarse filter skid 2 includes a skid frame 21 and an oil skimmer 22 and a CPI separator 23 integrated on the skid frame 21; the inlet of the oil skimmer 22 is connected to the outlet of the demulsifier 12, and the outlet of the oil skimmer 22 is connected to the inlet of the CPI separator 23; the bottom solid waste discharge outlets of the oil skimmer 22 and the CPI separator 23 are connected to an external solid waste treatment system.

[0039] The cyclone flotation skid 3 includes a skid 31 and a cyclone separator 32 and a dissolved air flotation machine 33 integrated on the skid 31; the inlet of the cyclone separator 32 is connected to the liquid phase outlet of the CPI separator 23, and the bottom liquid phase outlet of the cyclone separator 32 is connected to the inlet of the dissolved air flotation machine 33.

[0040] The depth filtration skid 4 includes a skid 41 and a membrane filtration assembly 42 and a depth filter 43 integrated on the skid 41; the inlet of the membrane filtration assembly 42 is connected to the liquid phase outlet of the dissolved air flotation machine 33, and the fresh water outlet of the membrane filtration assembly 42 is connected to the inlet of the depth filter 43.

[0041] The recovery skid 5 includes a skid frame 51 and an oil phase tank 52 and a clean water tank 53 integrated on the skid frame 51; the oil phase outlets of the skid tank 22, CPI separator 23, cyclone separator 32, and dissolved air flotation machine 33 are all connected to the inlet of the oil phase tank 52; the upper side wall of the oil phase tank 52 is provided with an oil phase outlet connected to an external oil recovery system; the outlet of the depth filter 43 is connected to the inlet of the clean water tank 53; the clean water outlet of the clean water tank 53 is used to provide clean water to the outside, and is also connected to the backwash water inlet of the membrane filter assembly 42 through a pipeline;

[0042] The backwash wastewater outlet of membrane filter module 42 and the sedimentation wastewater outlet at the bottom of oil phase tank 52 are both connected to the inlet of skimming tank 22 via pipelines;

[0043] Skid 1 (11), Skid 2 (21), Skid 3 (31), Skid 4 (41), and Skid 5 (51) all adopt H-shaped steel structure frames coated with anti-corrosion coating. The steel structure is equipped with instrument and electrical wiring boxes. The corresponding pipelines of the skid blocks are equipped with valves for controlling the opening and closing of the pipelines and pumps for providing power for the flow of materials.

[0044] The working principle of the offshore platform oily wastewater filtration and treatment device described in this utility model is as follows:

[0045] Oily wastewater enters from demulsification tank 12, undergoes chemical demulsification, and then enters skimming tank 22 for gravity separation. It then enters CPI separator 23 for further separation. The liquid phase enters hydrocyclone separator 32 and dissolved air flotation unit 33 for intermediate oil removal. Afterwards, it enters membrane filtration module 42 and depth filter 43 for deep oil removal. Finally, the clean water is stored in clean water tank 53, and the oil phase is collected in oil phase tank 52. The oil phase outlet of oil phase tank 52 periodically discharges the oil phase to an external oil recovery system, and the clean water outlet of clean water tank 53 periodically provides clean water to the outside world. The backwash water for membrane filtration module 42 comes from clean water tank 53, and the backwash wastewater from membrane filtration module 42 and the wastewater deposited at the bottom of oil phase tank 52 are periodically returned to skimming tank 22.

[0046] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A device for filtering and treating oily wastewater from offshore platforms, characterized in that: It includes a pre-filter skid, a coarse filter skid, a swirl flotation skid, a depth filter skid, and a recovery skid; the recovery skid is located on the lower layer, and the remaining skids are located on the upper layer, with the two layers being detachable and installable; an inclined ladder is provided between the lower layer skids and the upper layer skids, and a grid plate walkway is provided between the skids on the same layer; The front skid is used for pretreatment of oily wastewater; The coarse filter skid is used for gravity separation and coarse filtration of pretreated wastewater. The cyclone flotation skid is used for intermediate oil removal from the coarsely filtered wastewater. The depth filter skid is used for deep oil removal of the liquid phase after intermediate oil removal; The recovery skid is used to recover the oil phase separated by the coarse filter skid and the cyclone flotation skid, and to recover the clean water separated by the deep filter skid.

2. The offshore platform oily wastewater filtration and treatment device according to claim 1, characterized in that: The front skid includes a skid frame, a demulsifying tank integrated on the skid frame, and a dosing tank; the top of the demulsifying tank is provided with an oily wastewater inlet.

3. The offshore platform oily wastewater filtration and treatment device according to claim 2, characterized in that: The coarse filter skid includes a second skid frame and an oil skimmer and a CPI separator integrated on the second skid frame; the inlet of the oil skimmer is connected to the outlet of the demulsifying tank, and the outlet of the oil skimmer is connected to the inlet of the CPI separator; the bottom solid waste discharge outlets of the oil skimmer and the CPI separator are connected to an external solid waste treatment system.

4. The offshore platform oily wastewater filtration and treatment device according to claim 3, characterized in that: The cyclone flotation skid includes a skid frame three and a cyclone separator and a dissolved air flotation machine integrated on the skid frame three; the inlet of the cyclone separator is connected to the liquid phase outlet of the CPI separator, and the bottom liquid phase outlet of the cyclone separator is connected to the inlet of the dissolved air flotation machine.

5. The offshore platform oily wastewater filtration and treatment device according to claim 4, characterized in that: The depth filtration skid includes a skid four and a membrane filtration assembly and a depth filter integrated on the skid four; the inlet of the membrane filtration assembly is connected to the liquid phase outlet of the dissolved air flotation machine, and the freshwater outlet of the membrane filtration assembly is connected to the inlet of the depth filter.

6. The offshore platform oily wastewater filtration and treatment device according to claim 5, characterized in that: The recycling skid includes a skid frame five and an oil phase tank and a clear water tank integrated on the skid frame five; the oil phase outlets of the skid tank, the CPI separator, the cyclone separator, and the dissolved air flotation machine are all connected to the inlet of the oil phase tank; the outlet of the depth filter is connected to the inlet of the clear water tank.

7. The offshore platform oily wastewater filtration and treatment device according to claim 6, characterized in that: The clean water tank has a clean water outlet for supplying clean water to the outside environment, and is also connected to the backwash water inlet of the membrane filtration assembly via a pipeline.

8. The offshore platform oily wastewater filtration and treatment device according to claim 6, characterized in that: The backwash wastewater outlet of the membrane filtration assembly and the sedimentation wastewater outlet at the bottom of the oil phase tank are both connected to the inlet of the skimming tank via pipelines.

9. The offshore platform oily wastewater filtration and treatment device according to claim 6, characterized in that: The upper side wall of the oil phase tank is provided with an oil phase outlet that connects to an external oil recovery system.

10. The offshore platform oily wastewater filtration and treatment device according to claim 6, characterized in that: All five skids (skid one, skid two, skid three, skid four, and skid five) are H-shaped steel structure frames coated with anti-corrosion coating, and the steel structures are equipped with instrument and electrical wiring boxes.

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