A device and method for removing oil and suspended solids from water

Abstract

The application provides a device and method for removing oil and suspended solids in water, which comprises an adjusting micro-vortex coalescence oil removal section and a sedimentation section; a micro-vortex coalescer containing a micro-vortex coalescence element is arranged upstream of the adjusting micro-vortex coalescence oil removal section; a micro-vortex reactor containing a micro-vortex reaction ball is arranged upstream of the sedimentation section and downstream of the adjusting micro-vortex coalescence oil removal section. The technical scheme of the application has a greater improvement in oil removal efficiency and suspended solid removal efficiency than traditional processes. The device provided by the application integrates the functions of micro-vortex coalescence oil removal, adjusting natural oil removal, micro-vortex reaction, sedimentation, buffering and the like, replaces the traditional three-stage structure, changes the traditional plane arrangement mode, changes the multi-stage treatment equipment from a plane to a three-dimensional form, and solves the problems of long treatment process, large occupied area, easy absorption of suspended solids and deflection, easy blockage of coalescence materials and the like in oil and gas field produced water treatment.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of oil and gas field produced water treatment, and in particular to a device and method for removing oil and suspended solids. BACKGROUND

[0002] In the process of oil and gas field produced water treatment, the oil removal section of most produced water treatment stations mainly adopts the process of "natural oil removal + coagulation oil removal + buffer". This oil removal and suspended solids removal process has the problems of low oil removal efficiency, poor reaction effect, poor suspended solids removal effect, etc., and generally uses three-stage treatment structures, which have many stages and large land occupation. A multifunctional oil removal device is disclosed in Chinese patent (ZL201721134145.6), but this oil removal device has the following problems: first, the device adopts an upper, middle and lower structure, which is not easy to realize in structure and is difficult to manufacture and construct; second, the first oil removal zone of the device uses gravity sedimentation to remove oil, which can only remove oil particles with a particle size of 100 μm or more, resulting in poor oil removal effect in this section, and the oil content of the effluent is usually about 150 mg / L, a large amount of oil particles with a particle size of less than 100 μm in the water enter the second oil removal zone, resulting in a large amount of chemicals and a large amount of hazardous waste such as oil sludge; third, the device uses vertical flow, and the water distribution and water collection system is complex and prone to blockage and flow deviation. Fourth, the device is not resistant to load impact, as the water distribution horn of the second oil removal zone of the device is upward, when the water quantity changes, the oil and part of the suspended solids re-enter the water, resulting in poor oil removal and suspended solids removal effect. The existing coalescence oil removal technology for produced water treatment mostly uses fillers such as anthracite, ceramic, and serpentine, which has the problem of easy clogging, limiting its application in oil and gas fields. SUMMARY

[0003] The following is a summary of the subject matter of the detailed description herein. This summary is not intended to limit the scope of the claims.

[0004] To overcome the problems of low oil removal efficiency, poor reaction effect, poor suspended solids removal effect, and large land occupation of the existing oil and gas field produced water oil removal and suspended solids removal process, the present application provides an integrated treatment device for removing oil and suspended solids, which integrates micro-vortex coalescence oil removal, adjustment oil removal, micro-vortex reaction, sedimentation, and buffer functions, and can replace the three-stage treatment structure of the traditional process.

[0005] The present application provides a device for removing oil and suspended solids from water, comprising:

[0006] an adjustment micro-vortex coalescence oil removal section and a sedimentation section;

[0007] The micro-vortex coalescer is provided with a micro-vortex coalescing element configured to enable oil and suspended solids in the oil-containing wastewater to be treated to be gathered and enlarged by micro-vortex effect.

[0008] The micro-vortex reactor is provided with a micro-vortex reaction ball configured to enable micro-vortex coalescence reaction to be performed.

[0009] The micro-vortex coalescer is provided with a micro-vortex coalescing element configured to enable oil and suspended solids in the oil-containing wastewater to be treated to be gathered and enlarged by micro-vortex effect.

[0010] The micro-vortex coalescer is provided with a micro-vortex coalescing element configured to enable oil and suspended solids in the oil-containing wastewater to be treated to be gathered and enlarged by micro-vortex effect.

[0011] In an embodiment provided in the present application, the treatment device further comprises a tank body.

[0012] The tank body is a vertical structure, and the tank body is spaced into the micro-vortex coalescence oil removal section and the sedimentation section which are not communicated with each other, wherein the upper part of the tank body is the micro-vortex coalescence oil removal section, and the lower part of the tank body is the sedimentation section.

[0013] In an embodiment provided in the present application, the outlet of the micro-vortex coalescence oil removal section is arranged close to the inner side wall of the tank body, and the micro-vortex coalescence oil removal section is communicated with the micro-vortex reactor through the outlet.

[0014] In an embodiment provided in the present application, the water inlets of the plurality of micro-vortex coalescence oil removal sections are symmetrically arranged, and the axes of the symmetrically arranged water inlets of the plurality of micro-vortex coalescence oil removal sections coincide with the axis of the micro-vortex coalescence oil removal section.

[0015] In an embodiment provided in the present application, the water inlets of the plurality of sedimentation sections are symmetrically arranged, and the axes of the symmetrically arranged water inlets of the plurality of sedimentation sections coincide with the axis of the sedimentation section.

[0016] In an embodiment provided in the present application, the outlet of the micro-vortex coalescence oil removal section is a first annular circular pipe, and the lower end of the first annular circular pipe is provided with an opening hole capable of enabling liquid to flow in; and the liquid in the micro-vortex coalescence oil removal section enters the micro-vortex reactor through the first annular circular pipe.

[0017] In an embodiment provided in the present application, the outlet of the settling section is arranged close to the inner side wall of the tank body.

[0018] In an embodiment provided in the present application, the outlet of the settling section is a second annular circular pipe, the lower end of the second annular circular pipe is provided with an opening; the settling section flows out of the water oil and suspended solid removal device through the second annular circular pipe.

[0019] In an embodiment provided in the present application, the adjusting micro-vortex coalescence oil removal section is provided with a first blowdown port and a first oil outlet;

[0020] The first oil outlet is located above the first annular circular pipe, and the first annular circular pipe is located above the first blowdown port.

[0021] In an embodiment provided in the present application, the settling section is provided with a second blowdown port and a second oil outlet;

[0022] The second oil outlet is located above the second annular circular pipe, and the second annular circular pipe is located above the second blowdown port.

[0023] In an embodiment provided in the present application, the micro-vortex coalescence element is a micro-vortex coalescence ball provided with coalescence fillers, the micro-vortex coalescence element is a hollow structure, comprising:

[0024] A porous shell; the porous shell is provided with a flow guide hole communicating the inside and outside of the micro-vortex coalescence element;

[0025] Coalescence fillers, the coalescence fillers are arranged in the hollow structure,

[0026] The longest diameter of the flow guide hole is smaller than the shortest diameter of the coalescence fillers.

[0027] In an embodiment provided in the present application, the flow guide hole accounts for 30% to 80% of the area of the porous shell.

[0028] In an embodiment provided in the present application, the micro-vortex coalescence element is a spherical body; in an embodiment provided in the present application, the ratio of the outer diameter of the micro-vortex coalescence element to the thickness of the porous shell is (100 to 300):(1 to 6); in an embodiment provided in the present application, the ratio of the outer diameter of the micro-vortex coalescence element to the diameter of the flow guide hole is (100 to 300):(15 to 40).

[0029] In an embodiment provided in the present application, the coalescence fillers in one micro-vortex coalescence element have a rotating space in the porous shell.

[0030] In an embodiment provided by the present application, the material of the porous shell can be selected from any one or more of ABS material, modified ABS material, polypropylene material, modified polypropylene material, and polyethylene plastic material.

[0031] In an embodiment provided by the present application, the material of the coalescing filler can be selected from any one or more of ABS material, modified ABS material, polypropylene material, modified polypropylene material, and polyethylene plastic material.

[0032] In an embodiment provided by the present application, the ratio of the outer diameter of the micro-vortex coalescing element to the outer diameter of the coalescing filler is 1: (0.125 to 0.5).

[0033] In an embodiment provided by the present application, the outer diameter of the micro-vortex coalescing element can be 100 mm to 300 mm.

[0034] In an embodiment provided by the present application, the outer diameter of the coalescing filler can be 25 mm to 75 mm. In an embodiment provided by the present application, the outer diameter of the coalescing filler is greater than the diameter of the flow guide hole.

[0035] In an embodiment provided by the present application, the coalescing filler is selected from any one or more of Pall ring filler, stepped ring filler, matrix saddle ring filler, hollow sphere filler, hollow sphere filler, porous sphere filler, Raschig ring filler, hetero-saddle ring filler, and gear ring filler.

[0036] In an embodiment provided by the present application, the average density of the material of the micro-vortex coalescing element is 0.9 x 10 3 kg / m 3 to 1.1 x 10 3 kg / m 3 .

[0037] In an embodiment provided by the present application, the number of micro-vortex coalescing elements is one or more than two, and when the number of micro-vortex coalescing elements is more than two, the water outlet of the most downstream micro-vortex coalescing element is in communication with the water inlet of the natural oil removal section.

[0038] The number of micro-vortex reactors is one or more than two, and when the number of micro-vortex reactors is more than two, the water outlet of the most downstream micro-vortex reactor is in communication with the water inlet of the sedimentation section.

[0039] In an embodiment provided by the present application, the water inlet of the micro-vortex reactor further comprises a medicament inlet.

[0040] In an embodiment provided by the present application, the medicament is selected from any one or more of demulsifiers, coagulants, and flocculants.

[0041] In an embodiment provided in the application, the residence time of the micro-vortex coalescer and the micro-vortex reactor is independently selected from 2 min to 20 min, preferably, the residence time is independently selected from 5 min to 10 min;

[0042] The empty bed flow rate of the micro-vortex coalescer and the micro-vortex reactor is independently selected from 10 m / h to 360 m / h, preferably, the empty bed flow rate is independently selected from 25 m / h to 90 m / h;

[0043] In an embodiment provided in the application, the hydraulic residence time of the micro-vortex coalescence oil removal section is 30 min to 180 min;

[0044] In an embodiment provided in the application, the hydraulic residence time of the settling section is 30 min to 120 min.

[0045] The beneficial effects of the application are:

[0046] The technical solution of the application has a greater improvement in oil removal efficiency and suspended solid removal efficiency than the traditional process. The problems of low oil removal efficiency, poor reaction effect, and poor suspended solid removal effect in the traditional process are solved. The device provided in the application integrates the functions of micro-vortex coalescence oil removal, natural oil removal adjustment, micro-vortex reaction, settling, and buffering, replaces the traditional three-stage structure, changes the traditional plane arrangement mode, changes the multi-stage treatment equipment from plane to three-dimensional, solves the problems of long process, large occupied area, easy absorption of suspended solids, and easy blockage of coalescence materials, has the characteristics of short process and small occupied area, and the occupied area can be reduced by more than 40%. The oil content and suspended solids in the outlet water of the device can be reduced to below 20 mg / L. Compared with ZL201721134145.6, the outlet water of the micro-vortex coalescence section in the application is 50 mg / L, the oil in the micro-vortex coalescence section can be recycled, 0.1 kg of oil is recycled per cubic meter of produced water, the amount of waste oil sludge is reduced by 0.1 kg, the amount of chemicals is reduced by more than 30%, and the treatment cost of single cubic meter of water is saved by 0.3 yuan / m 3 The device solves the problems of difficulty in implementation, manufacturing, and construction, large amount of chemicals, more generated hazardous waste such as waste oil sludge, complex water distribution and water collection system, easy blockage, flow deviation, and poor load impact resistance in the ZL201721134145.6 patent.

[0047] Other features and advantages of the application will be set forth in the following description, and in part will become apparent to those skilled in the art from the description, or can be learned by practice of the application. Other advantages of the application can be realized and attained by the embodiments described in the specification. BRIEF DESCRIPTION OF DRAWINGS

[0048] The accompanying drawings are used to provide an understanding of the technical scheme of the present application, and constitute a part of the specification, and are used together with the embodiments of the present application to explain the technical scheme of the present application, and do not constitute a limitation on the technical scheme of the present application.

[0049] Figure 1 A schematic view of an oil and suspended solid integrated treatment device according to an exemplary embodiment of the present application.

[0050] Reference signs: 1, tank body; 2, adjusting micro-vortex coalescence oil removal section; 3, sedimentation section;

[0051] 4-1, first-stage micro-vortex coalescer; 4-2, second-stage micro-vortex coalescer; 4-3, interconnecting pipe between the first-stage and second-stage micro-vortex coalescers; 4101, bottom grid of the first-stage micro-vortex coalescer; 4102, first micro-vortex coalescing element; 4201, bottom grid of the second-stage micro-vortex coalescing element; 4202, second micro-vortex coalescing element; 4203, first water distribution hole; 4102-1, flow guide hole; 4102-2, coalescing filler; 4102-3, perforated shell;

[0052] 5-1, first-stage micro-vortex reactor; 5-2, second-stage micro-vortex reactor; 5-3, interconnecting pipe between the first-stage and second-stage micro-vortex reactors; 5101, bottom grid of the first-stage micro-vortex reactor; 5102, first micro-vortex reaction ball; 5201, bottom grid of the second-stage micro-vortex reactor; 5202, second micro-vortex reaction ball; 5203, second water distribution hole;

[0053] 6, water inlet pipe;

[0054] 7, adjusting micro-vortex coalescence oil removal section water collecting device; 7101, top baffle of the adjusting micro-vortex coalescence oil removal section water collecting device; 7102, annular perforated pipe of the adjusting micro-vortex coalescence oil removal section water collecting device; 7103, water collecting branch pipe of the adjusting micro-vortex coalescence oil removal section water collecting device; 7104, lower baffle of the adjusting micro-vortex coalescence oil removal section water collecting device; 7105, water collecting main pipe of the adjusting micro-vortex coalescence oil removal section water collecting device;

[0055] 8, interconnecting pipe between the adjusting micro-vortex coalescence oil removal section and the micro-vortex reactor; 9, bottom plate of the adjusting micro-vortex coalescence oil removal section; 10, inclined pipe;

[0056] 11, sedimentation section water collecting device; 11101, top baffle of the sedimentation section water collecting device; 11102, annular perforated pipe of the sedimentation section water collecting device; 11103, water collecting branch pipe of the sedimentation section water collecting device; 11104, lower baffle of the sedimentation section water collecting device; 11105, water collecting main pipe of the sedimentation section water collecting device;

[0057] 12, water outlet pipe; 13, oil collection tank of the adjusting micro-vortex coalescence oil removal section; 14, oil collection pipe of the adjusting micro-vortex coalescence oil removal section; 15, annular perforated oil collection pipe of the sedimentation section; 16, oil collection pipe of the sedimentation section; 17, sludge discharge pipe of the first micro-vortex coalescer; 18, sludge discharge pipe of the second micro-vortex coalescer; 19, sludge discharge pipe of the adjusting micro-vortex coalescence oil removal section; 20, sludge discharge pipe of the sedimentation section; 21, sludge discharge pipe of the first micro-vortex reactor; 22, sludge discharge pipe of the second micro-vortex reactor; 23, coagulant feeding port; 24, flocculant feeding port.

[0058] Figure 2 It is a partial enlarged view of the water collecting device 7 of the adjusting micro-vortex coalescence oil removal section and the water collecting device 11 of the sedimentation section.

[0059] Figure 3 It is a plan view of the water collecting device 7 of the adjusting micro-vortex coalescence oil removal section and the water collecting device 11 of the sedimentation section.

[0060] Figure 4 It is a partial enlarged view of the lower baffle 7104 of the water collecting device 7 of the adjusting micro-vortex coalescence oil removal section and the lower baffle 11104 of the water collecting device 11 of the sedimentation section.

[0061] Figure 5 It is a schematic view of a micro-vortex coalescence element.

[0062] Figure 6 It is a schematic view of the internal filler of the cross section of a micro-vortex coalescence element.

[0063] Figure 7 It is a schematic view of a porous shell.

[0064] Figure 8 It is a schematic view of a micro-vortex reaction ball. DETAILED DESCRIPTION

[0065] In order to make the purpose, technical scheme and advantages of the present application more clear, the embodiments of the present application are described in detail below. It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other arbitrarily without conflict.

[0066] Figure 1 It is a schematic view of an oil and suspended solid integrated treatment device. Figure 2 It is a partial enlarged view of the water collecting device 7 of the adjusting micro-vortex coalescence oil removal section and the water collecting device 11 of the sedimentation section. Figure 3 It is a plan view of the water collecting device 7 of the adjusting micro-vortex coalescence oil removal section and the water collecting device 11 of the sedimentation section. Figure 4 It is a partial enlarged view of the lower baffle 7104 of the water collecting device 7 of the adjusting micro-vortex coalescence oil removal section and the lower baffle 11104 of the water collecting device 11 of the sedimentation section. Figure 5 It is a schematic view of a micro-vortex coalescence ball. Figure 6is a schematic diagram of the internal filler of the micro-vortex coalescence ball profile. Figure 7 is a schematic diagram of the micro-vortex coalescence ball shell. Figure 8 is a schematic diagram of a micro-vortex reaction ball.

[0067] As shown in Figures 1 to 8 , the embodiment of the present application provides a water oil and suspended solid removal treatment device, comprising: an adjusting micro-vortex coalescence oil removal section 2 and a sedimentation section 3;

[0068] The upstream of the adjusting micro-vortex coalescence oil removal section 2 is provided with a micro-vortex coalescer, the micro-vortex coalescer contains a micro-vortex coalescence element, and the micro-vortex coalescence element is configured to be capable of using micro-vortex effect to make oil and suspended solids in the oil-containing wastewater to be treated gather and become larger.

[0069] The upstream of the sedimentation section 3 and the downstream of the adjusting micro-vortex coalescence oil removal section 2 are provided with a micro-vortex reactor, the micro-vortex reactor contains a micro-vortex reaction ball, and the micro-vortex reaction ball is configured to be capable of performing a micro-vortex coalescence reaction.

[0070] The adjusting micro-vortex coalescence oil removal section 2 is configured to adjust the micro-vortex effect to separate oil and suspended solids in the oil-containing wastewater to be treated from water.

[0071] One end of the micro-vortex coalescer is in communication with a water inlet pipe for providing the oil-containing wastewater to be treated, and the other end of the micro-vortex coalescer is in communication with one end of the adjusting micro-vortex coalescence oil removal section 2; the other end of the adjusting micro-vortex coalescence oil removal section 2 is in communication with one end of the micro-vortex reactor, and the other end of the micro-vortex reactor is in communication with the sedimentation section 3.

[0072] In the description of the present application, the terms "upstream" and "downstream" are distinguished according to the flow path of the oil-containing wastewater to be treated in the water oil and suspended solid removal treatment device, and the upstream is the first to flow through and the downstream is the last to flow through.

[0073] Exemplarily, as shown in Figure 1 , the treatment device further comprises a tank body 1.

[0074] The tank body 1 is a vertical structure, and the tank body is divided into the adjusting micro-vortex coalescence oil removal section and the sedimentation section which are not in communication with each other, wherein the upper part of the tank body 1 is the adjusting micro-vortex coalescence oil removal section 2, and the lower part of the tank body 1 is the sedimentation section 3.

[0075] Exemplarily, as shown in Figure 1 , the water inlets (i.e. first water distribution holes 4203) of the adjusting micro-vortex coalescence oil removal sections 2 are symmetrically arranged, and exemplarily, the axes of the water inlets of the adjusting micro-vortex coalescence oil removal sections 2 can coincide with the axis of the adjusting micro-vortex coalescence oil removal section 2.

[0076] For example, such as Figure 1 As shown, the inlets (i.e., the second water distribution holes 5203) of the plurality of sedimentation sections 3 are symmetrically arranged, and the axis of the inlets of the plurality of symmetrically arranged sedimentation sections 3 coincides with the axis of the sedimentation section 3.

[0077] For example, such as Figure 1 As shown, the outlet of the regulating micro-vortex coalescing oil removal section 2 is located near the inner wall of the tank 1. The outlet of the regulating micro-vortex coalescing oil removal section 2 is a first annular pipe (i.e., the regulating micro-vortex coalescing oil removal section water collection device 7), and the lower end of the first annular pipe is provided with an opening that allows liquid to flow in; the liquid in the regulating micro-vortex coalescing oil removal section 2 enters the micro-vortex reactor through the first annular pipe.

[0078] For example, the first annular pipe can also be set as a pipe of other shapes, or the first annular pipe can be omitted. When the water level reaches the water collection branch pipe 7103 of the regulating micro vortex coalescing oil removal section water collection device, it enters the water collection main pipe 7105 of the regulating micro vortex coalescing oil removal section water collection device and flows downstream.

[0079] For example, such as Figure 1 As shown, the outlet of the settling section 3 is located near the inner wall of the tank 1. The outlet of the settling section is a second annular pipe (settling section water collection device 7), and the lower end of the second annular pipe is provided with an opening; the settling section 3 flows out of the water through the second annular pipe to the treatment device for removing oil and suspended solids.

[0080] For example, the second annular pipe can also be set as a pipe of other shapes, or the second annular pipe can be omitted. When the water level reaches the water collection branch pipe 11103 of the regulating micro vortex coalescing oil removal section water collection device, it enters the water collection main pipe 11105 of the regulating micro vortex coalescing oil removal section water collection device and flows downstream.

[0081] For example, such as Figure 1 As shown, the regulating micro-vortex coalescing oil removal section is provided with a first sludge outlet (i.e., a sludge outlet connected to the sludge discharge pipe 19 of the regulating micro-vortex coalescing oil removal section) and a first oil outlet (i.e., the oil collection trough 13 of the regulating micro-vortex coalescing oil removal section, which can be an annular circular tube).

[0082] The first oil outlet is located above the first annular pipe, and the first annular pipe is located above the first drain outlet.

[0083] For example, such as Figure 1As shown, the sedimentation section is provided with a second blowdown opening (i.e. a blowdown opening in communication with the sedimentation section sludge discharge pipe 20) and a second oil outlet (i.e. the sedimentation section annular perforated oil collection pipe 15);

[0084] The second oil outlet is located above the second annular pipe, and the second annular pipe is located above the second blowdown opening.

[0085] Exemplarily, as shown in Figure 2 The opening of the first annular pipe is located at the lower part of the first annular pipe for liquid to flow into the first annular pipe; the opening of the second annular pipe is located at the lower part of the second annular pipe for liquid to flow into the second annular pipe;

[0086] Exemplarily, as shown in Figures 5 to 7 The micro-vortex coalescing element is a micro-vortex coalescing ball (i.e. a perforated shell 4102-3, which can be completely the same as the micro-vortex reaction ball) provided with coalescing fillers 4102-2, and the micro-vortex coalescing element is a hollow structure, comprising:

[0087] A perforated shell 4102-3, which is provided with flow guide holes 4102-1 in communication between the inside and outside of the micro-vortex coalescing element;

[0088] Coalescing fillers 4102-2, which are arranged in the hollow structure,

[0089] The longest diameter of the flow guide hole 4102-1 is smaller than the shortest diameter of the coalescing filler 4102-2.

[0090] Exemplarily, the flow guide hole 4102-1 accounts for 30% to 80% of the area of the perforated shell 4102-3.

[0091] Exemplarily, the micro-vortex coalescing element is a sphere; in an embodiment provided in the present application, the ratio of the outer diameter of the micro-vortex coalescing element to the thickness of the perforated shell 4102-3 is (100 to 300):(1 to 6); exemplarily, the ratio of the outer diameter of the micro-vortex coalescing element to the diameter of the flow guide hole 4102-1 is (100 to 300):(15 to 40).

[0092] Exemplarily, the coalescing fillers 4102-2 in one micro-vortex coalescing element have a rotating space in the perforated shell 4102-3.

[0093] Exemplarily, the material of the perforated shell 4102-3 can be selected from any one or more of ABS material, modified ABS material, polypropylene material, modified polypropylene material, and polyethylene plastic material.

[0094] Exemplarily, the material of the coalescing filler 4102-2 can be selected from any one or more of ABS material, modified ABS material, polypropylene material, modified polypropylene material, and polyethylene.

[0095] Exemplarily, the ratio of the outer diameter of the micro-vortex coalescing element to the outer diameter of the coalescing filler 4102-2 is 1:(0.125 to 0.5).

[0096] Exemplarily, the outer diameter of the micro-vortex coalescing element can be 100 mm to 300 mm.

[0097] Exemplarily, the outer diameter of the coalescing filler 4102-2 can be 25 mm to 75 mm. Exemplarily, as shown in Figure 5 Exemplarily, the outer diameter of the coalescing filler is greater than the diameter of the flow guide hole 4102-1.

[0098] Exemplarily, the coalescing filler 4102-2 is selected from any one or more of Pall ring filler, stepped ring filler, matrix saddle ring filler, hollow sphere filler, porous sphere filler, multi-sphere filler, Raschig ring filler, hetero-saddle ring filler, and gear ring filler.

[0099] Exemplarily, the average density of the material of the micro-vortex coalescing element is 0.9 x 10 3 kg / m 3 to 1.1 x 10 3 kg / m 3 .

[0100] In an embodiment provided in the present application, the number of the micro-vortex coalescers is one or more than two, and when the number of the micro-vortex coalescers is more than two, the water outlet of the most downstream micro-vortex coalescer 1 is in communication with the water inlet of the natural oil removal section;

[0101] The number of the micro-vortex reactors 2 is one or more than two, and when the number of the micro-vortex reactors is more than two, the water outlet of the most downstream micro-vortex reactor is in communication with the water inlet of the sedimentation section.

[0102] Exemplarily, as shown in Figure 1 Exemplarily, the water inlet of the micro-vortex reactor further comprises a medicament inlet (for example, coagulant dosing port 23 and flocculant dosing port 24 located in the adjusting micro-vortex coalescing oil removal section and micro-vortex reactor connecting pipe 8);

[0103] Exemplarily, the medicament is selected from any one or more of demulsifier, coagulant, and flocculant.

[0104] For example, the residence time of the micro vortex coalescer and the micro vortex reactor are each independently selected from 2 min to 20 min, preferably, the residence time is each independently selected from 5 min to 10 min;

[0105] The empty bed velocity of the micro vortex coalescer and the micro vortex reactor are each independently selected from 10 m / h to 360 m / h, and preferably each is independently selected from 25 m / h to 90 m / h.

[0106] For example, the hydraulic residence time of the adjusted micro-vortex coalescence oil removal section is 30 min to 180 min;

[0107] For example, the hydraulic residence time of the settling section is 30 min to 120 min.

[0108] Example 1:

[0109] like Figure 1 As shown, this application provides an integrated oil and suspended solids removal device, which consists of a regulating micro-vortex coalescing oil removal section 2, a settling section 3, a micro-vortex coalescer, and a micro-vortex reactor. The liquid flows sequentially through the micro-vortex coalescer, the regulating micro-vortex coalescing oil removal section 2, the micro-vortex reactor, and the settling section 3.

[0110] The micro-vortex coalescer consists of a first-stage micro-vortex coalescer 4-1, a second-stage micro-vortex coalescer 4-2, and a connecting pipe 4-3 between the first and second stages. The first-stage micro-vortex coalescer 4-1 comprises a cylindrical body, a bottom grid 4101, and a first micro-vortex coalescing element 4102. The second-stage micro-vortex coalescer 4-2 comprises a cylindrical body, a bottom grid 4201, a second micro-vortex coalescing ball 4202, and a water distribution hole 4203.

[0111] like Figure 1 As shown, to illustrate the water collection device 7 and inclined tube 10 of the micro-vortex coalescing oil removal section, a section of the micro-vortex coalescer 4-1 is drawn in a broken manner. The bottom grid 4101 of the section of the micro-vortex coalescer is used to maintain the first micro-vortex coalescing element 4102 within the section of the micro-vortex coalescer 4-1. The section of the micro-vortex reactor 5-1 is drawn similarly to the section of the micro-vortex coalescer 4-1.

[0112] like Figure 1 As shown, one end of the water collection device 7 for the regulating micro-vortex coalescing oil removal section is connected to the regulating micro-vortex coalescing oil removal section 2, and the other end of the water collection device 7 for the regulating micro-vortex coalescing oil removal section is connected to one end of the connecting pipe 8 between the regulating micro-vortex coalescing oil removal section and the micro-vortex reactor. The other end of the connecting pipe 8 between the regulating micro-vortex coalescing oil removal section and the micro-vortex reactor is connected to the micro-vortex reactor 5.

[0113] like Figure 1 As shown, the first micro-vortex coalescer 4-1 is not directly connected to the regulating micro-vortex coalescing oil removal section 2, the second micro-vortex coalescer 4-2 is directly connected to the regulating micro-vortex coalescing oil removal section 2, the first micro-vortex reactor 5-1 is not directly connected to the settling section 3, and the second micro-vortex reactor 5-2 is directly connected to the settling section 3; the regulating micro-vortex coalescing oil removal section 2 is connected to the first micro-vortex reactor 5-1 through the annular perforated pipe 7102 of the regulating micro-vortex coalescing oil removal section water collection device, the water collection main pipe 7105 of the regulating micro-vortex coalescing oil removal section water collection device, and the connecting pipe 8 between micro-vortex reactors.

[0114] The micro vortex reactor consists of a first-stage micro vortex reactor 5-1, a second-stage micro vortex reactor 5-2, and a connecting pipe 5-3 between the first and second-stage micro vortex reactors. The first-stage micro vortex reactor 5-1 consists of a bottom grid 5101 and a third micro vortex ball 5102. The second-stage micro vortex reactor 5-2 consists of a bottom grid 5201, a fourth micro vortex ball 5202, and a water distribution hole 5203.

[0115] The first micro-vortex reaction sphere 5101 and the second micro-vortex reaction sphere 5102 can be Figure 8 The micro vortex sphere shown or with Figure 8 A similarly structured microvortex sphere. Exemplarily, the surface openings of the microvortex reaction sphere can be 10mm to 40mm; the opening ratio can be 30% to 80%; the wall thickness of the microvortex reaction sphere can be 1mm to 6mm; and the diameter of the microvortex reaction sphere can be 100mm to 300mm.

[0116] like Figure 1As shown, the produced water of oil and gas field first enters the first stage micro-vortex coalescer 4-1 through the water inlet pipe 6, and flows into the lower part of the first stage micro-vortex coalescer 4-1 and flows out from the upper part. The first stage micro-vortex coalescer 4-1 is located near the inner side wall of the tank body 1, and part of it is located in the adjusting micro-vortex coalescing oil removal section 2 and the other part is located in the sedimentation section 3. In the first stage micro-vortex coalescer 4-1, when the water flow passes through the porous spherical shell flow guide hole of the micro-vortex coalescer, the speed and direction of the water flow change, the speed gradient is formed between the flow layers, a large number of micro-vortices are formed in the fluid, which promotes the disturbance and collision of oil particles in the water, and then the oil particles are coalesced into large oil beads and float up, achieving the effect of collision and coalescence oil removal; and part of the oil particles and suspended solids collide and combine in the micro-vortex to make them have the ability to carry suspended solids to float up; after the micro-vortex through the porous spherical shell flow guide hole, some small oil particles are not coalesced by collision, and are adsorbed on the coalescing filler in the spherical shell, and with the accumulation of adsorption, an oil layer is formed on the coalescing filler, and large oil beads are gradually coalesced on the oil layer, and the oil beads float up from the filler under the action of the density difference, achieving the effect of wetting coalescence oil removal; the wetting coalescence of the coalescing filler makes up for the defect that the porous spherical shell micro-vortex collision coalescence does not capture small oil beads, combines the two coalescence forms, improves the coalescence effect of the filler, and expands the oil bead removal range. The oil and gas field produced water flowing out of the first stage micro-vortex coalescer 4-1 enters the second stage micro-vortex coalescer 4-2 through the interconnecting pipe 4-3 between the first and second stage micro-vortex coalescers.

[0117] The oil and gas field produced water in the second stage micro-vortex coalescer 4-2 is further coalesced by further micro-vortex and mutual collision, and then the oil and gas field produced water flows out of the second stage micro-vortex coalescer 4-2 through the first water distribution hole 4203, and flows radially to the horizontal and downward, and enters the adjusting micro-vortex coalescing oil removal section 2 (the space above the adjusting micro-vortex coalescing oil removal section bottom plate 9).

[0118] As shown in Figure 1 , Figure 2 , Figure 3 and Figure 4 , the oil and gas field produced water in the adjusting micro-vortex coalescing oil removal section 2 falls on the adjusting micro-vortex coalescing oil removal section bottom plate 9, and the liquid level rises until it reaches the height of the adjusting micro-vortex coalescing oil removal section water collecting device 7, and then enters the adjusting micro-vortex coalescing oil removal section water collecting device 7. Among them, the adjusting micro-vortex coalescing oil removal section water collecting device top baffle 7101, the adjusting micro-vortex coalescing oil removal section water collecting device lower baffle 7104 and the side wall of the tank body 1 together form an annular space which is sealed at the upper part and open at the lower part (from the adjusting micro-vortex coalescing oil removal section bottom plate 9 to the adjusting micro-vortex coalescing oil removal section water collecting device top baffle 7101). Figure 4As can be seen, the lower baffle 7104 can be jagged, and the water is collected more evenly to obtain better oil-water separation effect. The annular space is provided with an adjusting micro-vortex coalescence oil removal section water collecting device annular perforated pipe 7102, and the lower end of the pipe is provided with a hole. Oil and gas field produced water enters the adjusting micro-vortex coalescence oil removal section water collecting device annular perforated pipe 7102, and the oil and gas field produced water in the adjusting micro-vortex coalescence oil removal section water collecting device annular perforated pipe 7102 enters the adjusting micro-vortex coalescence oil removal section water collecting device water collecting branch pipe 7103, and then enters the adjusting micro-vortex coalescence oil removal section water collecting main pipe 7105, and then enters the adjusting micro-vortex coalescence oil removal section and the micro-vortex reactor interconnecting pipe 8 to flow out of the adjusting micro-vortex coalescence oil removal section 2.

[0119] The larger oil and suspended solid particles are separated in the adjusting micro-vortex coalescence oil removal section 2, and the oil floats to the top of the liquid surface of the adjusting micro-vortex coalescence oil removal section 2 and is collected by the adjusting micro-vortex coalescence oil removal section oil collecting groove 13 (provided on the annular structure of the side wall of the tank body 1) and then discharged through the adjusting micro-vortex coalescence oil removal section oil removal pipe 14.

[0120] The suspended solids in the oil and gas field produced liquid are deposited on the bottom plate 9 of the adjusting micro-vortex coalescence oil removal section and the bottoms of the first micro-vortex coalescer 4-1 and the second micro-vortex coalescer 4-2, and are discharged through the adjusting micro-vortex coalescence oil removal section sludge discharge pipe 19, the first micro-vortex coalescer sludge discharge pipe 17 and the second micro-vortex coalescer sludge discharge pipe 18 respectively.

[0121] The oil and gas field produced water enters the first micro-vortex reactor 5-1 in the micro-vortex reactor through the adjusting micro-vortex coalescence oil removal section and the micro-vortex reactor interconnecting pipe 8, and the oil and gas field produced water enters from the lower part of the first micro-vortex reactor 5-1 and is discharged from the upper part. When the water flow passes through the micro-vortex small holes at a proper flow rate, a large number of small vortices are generated on the inner and outer surfaces of the shell, the vortex flow of the water increases the flow rate gradient, promotes the diffusion and collision of colloids and fine oil particles in the water, and at the same time, due to the small flow rate, a three-dimensional flocculation layer is formed in the reactor. The three-dimensional flocculation layer has strong adsorption and net capture effect, so that the oil particles and suspended solid particles are increased, and the flocculation efficiency is improved. The oil and gas field produced water enters the lower part of the second micro-vortex reactor 5-2 through the first and second micro-vortex reactor interconnecting pipe 5-3, and the particles are further increased in the second micro-vortex reactor 5-2 through further micro-vortex, mutual collision and flocculation, and net capture effect.

[0122] Then the oil and gas field produced water flows out of the second micro-vortex reactor 5-2 through the second water distribution hole 5203, and the oil and gas field produced water flows radially to the horizontal and downward, and enters the space in the settling section 3 (the space above the bottom plate of the tank body 1 and below the bottom plate 9 of the adjusting micro-vortex coalescence oil removal section).

[0123] Exemplarily, the coagulant adding port 23 and the flocculant adding port 24 can be arranged on the interconnection pipe 8 between the micro-vortex reactors, and the coagulant and the flocculant are added respectively before the oil and gas field produced water enters the micro-vortex reactors, so that the emulsified oil is broken and the colloid is destabilized. When the water flow passes through the micro-vortex small holes at a proper flow rate, a large number of small vortexes are generated on the inner and outer surfaces of the shell, the vortex flow of the water increases the flow rate gradient, and the diffusion and collision of the colloid and the small oil particles in the water are promoted. At the same time, due to the small flow rate, a three-dimensional flocculation layer is formed in the reactor, and the three-dimensional flocculation layer has strong adsorption and netting effect, so that the oil particles and the suspended solid particles are increased, and the flocculation efficiency is improved.

[0124] As shown in Figure 1 , Figure 2 and Figure 3 , the oil and gas field produced water in the sedimentation section 3 falls to the bottom plate of the tank body 1, and the liquid level is continuously raised until the height of the sedimentation section water collecting device 11 is reached, and then enters the sedimentation section water collecting device 11. The top baffle 11101 of the sedimentation section water collecting device, the lower baffle 11104 of the sedimentation section water collecting device and the side wall of the tank body 1 together form a lower open annular space, and the annular perforated pipe 11102 of the sedimentation section water collecting device is arranged in the annular space. The lower end of the pipe is provided with a hole, so that the oil and gas field produced water enters the annular perforated pipe 11102 of the sedimentation section water collecting device. The oil and gas field produced water in the annular perforated pipe 11102 of the sedimentation section water collecting device enters the sedimentation section water collecting device through the sedimentation section water collecting device collecting branch pipe 11103, and then flows out of the tank body 1 through the water outlet pipe 12.

[0125] The oil and suspended solid particles in the oil and gas field produced water in the sedimentation section 3 are separated in the sedimentation section 3, the oil floats to the top of the liquid level, is collected by the sedimentation section annular perforated oil collecting pipe 15 (arranged in the annular structure of the side wall of the tank body 1), and then is discharged through the sedimentation section oil collecting pipe 16.

[0126] The suspended solids in the sedimentation section 3 are settled on the bottom plate of the tank body 1 and the bottom of the first micro-vortex reactor 5-1 and the second micro-vortex reactor 5-2, and are discharged through the sedimentation section sludge discharge pipe 21, the first micro-vortex reactor sludge discharge pipe 21 and the second micro-vortex reactor sludge discharge pipe 22 respectively.

[0127] Exemplarily, the oil and gas field produced water in the sedimentation section can pass through the inclined pipe 10, and further separate the oil and suspended solids by using the shallow pool principle.

[0128] The device provided by the application first removes oil through micro-vortex coalescence. When the water flows through the flow guide hole of the porous shell of the micro-vortex coalescer, the speed and direction of the water flow change, a speed gradient is formed between the flow layers, a large number of micro-vortices are formed in the fluid, the oil particles in the water are disturbed and collided, and then collide and coalesce into large oil droplets that float up, achieving the effect of collision and coalescence oil removal. Part of the oil particles and suspended solids collide and combine in the micro-vortices, thereby enabling them to carry suspended solids to float up. After the micro-vortices of the flow guide hole of the porous shell, some small oil particles that have not been collided and coalesced are adsorbed on the coalescing filler in the porous shell. With the accumulation of adsorption, an oil layer is formed on the coalescing filler, and large oil droplets are gradually coalesced on the oil layer. Under the action of the density difference, the oil droplets float up from the filler, achieving the effect of wetting and coalescence oil removal. The wetting and coalescence of the coalescing filler compensate for the small oil droplets that are not captured by the micro-vortex collision and coalescence of the porous shell. The combination of the two coalescence forms improves the coalescence effect of the filler and expands the oil droplet removal range. Then, the water enters the natural oil removal section, where part of the larger oil and suspended solid particles are separated through natural sedimentation. Then, coagulants and flocculants are added to the water, which enters the micro-vortex reaction section. In this section, the emulsified oil is broken and the colloids are destabilized through the addition of reagents. The broken emulsified oil and destabilized colloids increase through micro-vortex, mutual collision, three-dimensional flocculation, and net capture. Then, the water enters the sedimentation section, where three-phase separation of oil, mud, and water is completed.

Claims

1. A treatment device for removing oil and suspended solids from water, characterized in that, The water treatment device for removing oil and suspended solids integrates micro-vortex coalescence oil removal, regulating oil removal, micro-vortex reaction, sedimentation, and buffering functions, including: Adjust the micro-vortex coalescence oil removal section and the settling section; A micro-vortex coalescing oil removal section is provided upstream of the micro-vortex coalescing section. The micro-vortex coalescing section contains micro-vortex coalescing elements, which are configured to utilize micro-vortex action to cause oil and suspended solids in the oily wastewater to be treated to aggregate and increase in size. A micro vortex reactor is provided upstream of the settling section and downstream of the regulating micro vortex coalescence oil removal section. The micro vortex reactor contains micro vortex reaction balls, which are configured to carry out micro vortex coalescence reactions. The oil removal section with adjustable micro-vortex coalescence is configured to adjust the micro-vortex action to separate oil and suspended solids from water in the oily wastewater to be treated. One end of the micro vortex coalescer is connected to the inlet pipe that provides the oily wastewater to be treated, and the other end of the micro vortex coalescer is connected to one end of the regulating micro vortex coalescing oil removal section; the other end of the regulating micro vortex coalescing oil removal section is connected to one end of the micro vortex reactor, and the other end of the micro vortex reactor is connected to the settling section. The processing device also includes a tank; The tank is a vertical structure, and is divided into an independent regulating micro-vortex coalescing oil removal section and a settling section. The upper part of the tank is the regulating micro-vortex coalescing oil removal section, and the lower part of the tank is the settling section. The outlet of the regulating micro-vortex coalescing oil removal section is located near the inner wall of the tank. Degreasing The section is connected to the micro vortex reactor through this outlet; The outlet of the regulating micro-vortex coalescence oil removal section is a first annular pipe, which is provided with an opening that allows liquid to flow in; the first annular pipe is connected to the micro-vortex reactor. The outlet of the settling section is located near the inner wall of the tank. The outlet of the settling section is a second annular pipe, and the lower end of the second annular pipe is provided with an opening; the water outlet of the water treatment device for removing oil and suspended solids in the second annular pipe is connected.

2. The water treatment device for removing oil and suspended solids according to claim 1, characterized in that, The regulating micro-vortex coalescence oil removal section is provided with a first drain outlet and a first oil outlet; The first oil outlet is located above the first annular pipe, and the first annular pipe is located above the first drain outlet.

3. The water treatment device for removing oil and suspended solids according to claim 1 or 2, characterized in that, The settling section is equipped with a second sewage outlet and a second oil outlet; The second oil outlet is located above the second annular pipe, and the second annular pipe is located above the second drain outlet.

4. The water treatment device for removing oil and suspended solids according to claim 1 or 2, characterized in that, The micro vortex coalescing element is a micro vortex coalescing ball filled with coalescing packing material, and the ratio of the outer diameter of the micro vortex coalescing ball to the outer diameter of the coalescing packing material is 1:(0.125 to 0.5).

5. The water treatment device for removing oil and suspended solids according to claim 4, characterized in that, The micro-vortex coalescing spheres have a diameter of 100 mm to 300 mm and are filled with coalescing filler with a diameter of 25 mm to 75 mm. The average density of the material in the micro-vortex coalescing element is 0.9 × 10⁻⁶. 3 kg / m 3 Up to 1.1×10 3 kg / m 3 .

6. The water treatment device for removing oil and suspended solids according to claim 4, characterized in that, The number of micro vortex coalescers is one or more. When the number of micro vortex coalescers is two or more, the outlet of the most downstream micro vortex coalescer is connected to the inlet of the regulating micro vortex coalescing oil removal section. The number of micro vortex reactors is one or more. When the number of micro vortex reactors is two or more, the outlet of the most downstream micro vortex reactor is connected to the inlet of the settling section.

7. The water treatment device for removing oil and suspended solids according to claim 1 or 2, characterized in that, The inlet of the micro vortex reactor also includes a reagent inlet.

8. The treatment device for removing oil and suspended solids from water according to claim 7, characterized in that, The agent is selected from any one or more of demulsifiers, coagulants, and flocculants.

9. A method for removing oil and suspended solids from water, characterized in that, The water treatment apparatus for removing oil and suspended solids as described in any one of claims 1 to 8; The residence time of the micro vortex coalescer and the micro vortex reactor are each independently selected from 2 min to 20 min; The empty bed velocity of the micro vortex coalescer and the micro vortex reactor are each independently selected from 10 m / h to 360 m / h; The hydraulic residence time of the micro-vortex coalescence oil removal section is adjusted to be 30 min to 180 min. The hydraulic residence time of the settling section is 30 min to 120 min.

10. The method according to claim 9, characterized in that, The residence time of the micro vortex coalescer and the micro vortex reactor are each independently selected from 5 min to 10 min; The empty bed velocity of the micro vortex coalescer and the micro vortex reactor are each independently selected from 25 m / h to 90 m / h.

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