CN115477354A

CN115477354A - Compact gas flotation separation device

Info

Publication number: CN115477354A
Application number: CN202211212183.4A
Authority: CN
Inventors: 刘冰; 颜昌平
Original assignee: Shanghai Sifang Boiler Group Engineering System Co ltd
Current assignee: Shanghai Sifang Boiler Group Engineering System Co ltd
Priority date: 2022-09-30
Filing date: 2022-09-30
Publication date: 2022-12-16

Abstract

The invention discloses a compact gas flotation separation device, and relates to the technical field of oil-water separation. Compact gas flotation separation device, including vertical container shell, sieve mesh baffle, whirl air supporting cover, water distributor and the compact air supporting jar that the leading water pipe is constituteed, sieve mesh baffle fixed connection is in vertical container shell inner wall, and whirl air supporting cover fixed connection is in sieve mesh baffle bottom, and wherein, water distributor and water distributor set up in whirl air supporting cover bottom inner wall, leading water pipe fixed connection in vertical container shell bottom and top and water distributor fixed connection. According to the invention, the oil content in water is reduced to 0.5mg/L by adjusting the pressure, the backwater proportion and the gas solubility to the optimal working condition, and the oil content is reduced to 4.7mg/L by adjusting the parameters of each working condition to the unfavorable condition, so that the environmental protection standard is completely met, and sufficient safety margin is reserved, which cannot be achieved by the conventional separation means.

Description

Compact gas flotation separation device

Technical Field

The invention relates to the technical field of oil-water separation, in particular to a compact gas flotation separation device.

Background

Under the call of 'green water mountain is the Jinshan Yinshan', the environmental protection requirement is becoming stricter and the execution force is gradually increased. The production water of oil and gas fields, coal bed gas, coal chemical industry and the like contains a small amount of oil, which is usually lower than 0.5 percent, although the economic value is not high, the oil content of the production water far exceeding the environmental protection standard and less than or equal to 30mg/L is required to be treated. The production water belongs to oil-in-water mixed liquid, a conventional horizontal or vertical separator is adopted for gravity separation, few manufacturers adopt a box-type air flotation scheme for impurity removal, and on one hand, the device mainly aims at tiny particle impurities and has a good effect, and the simple flotation effect has low separation efficiency on the working condition that the production water contains tiny oil, the device volume under large treatment capacity is very large, and the problems of uneven bubble distribution and bubble fusion can be caused after the volume is large. On the other hand, the disturbance of the oil-water stratified region is large, which is not beneficial to the continuous and stable separation of oil and water, and the oil content of the treated water is easy to have the condition of discontinuity exceeding standard.

Disclosure of Invention

The object of the present invention is to provide a compact gas flotation separation device to solve the problems set forth in the background art.

In order to achieve the purpose, the invention provides the following technical scheme: compact gas flotation separation device, including the compact air supporting jar that vertical container shell, sieve mesh baffle, whirl air supporting cover, water distribution distributor and leading water pipe are constituteed, sieve mesh baffle fixed connection is in vertical container shell inner wall, and whirl air supporting cover fixed connection is in sieve mesh baffle bottom, and wherein, water distribution distributor and leading water pipe set up in whirl air supporting cover bottom inner wall, and leading water pipe fixed connection is in vertical container shell bottom and top and water distribution distributor fixed connection.

Preferably, a secondary separation space is formed between the upper part of the sieve mesh partition plate and the vertical container shell and is used for enabling oil and water to be gathered and layered, a stable oil phase is formed in the secondary separation space and is discharged from an oil and gas outlet at the top of the vertical container shell.

Preferably, the cyclone air flotation cover is of a conical structure with a large bottom and a small top, wherein a bottom plate of the cyclone air flotation cover is in a ladder shape with a high middle and a low periphery.

Preferably, an included angle alpha is formed between the bottom plate of the rotational flow air floating cover and the side wall of the rotational flow air floating cover, the value of the alpha is 73-86 degrees, the contraction angle of a cone shell of the side wall of the rotational flow air floating cover is set to be beta, and the value of the beta is 53-78 degrees.

Preferably, the top of the rotational flow air floating cover is welded with the sieve pore partition plate, and the bottom plate of the rotational flow air floating cover is welded and sealed with the top of the water conduit.

Preferably, the lowest position of the edge of the bottom plate of the rotational flow air floating cover is provided with a drain pipe, the drain pipe is communicated with the outside of the vertical container shell and used for discharging sediments, the drain pipe is made of 316 stainless steel, and all the inside is polished with high precision and used for reducing rotational flow resistance.

Preferably, the water distribution distributor and the water distribution pipe form a water distribution assembly, and the oily sewage supplied by the water conduit is divided by the water distribution assembly.

Preferably, the tail end of the water distribution pipe is arranged in an upward inclined mode, the inclined angle is set to be theta, and the theta is 5-15 degrees.

Preferably, the sieve pore partition plate is made by opening holes on a circular stainless steel plate, and is used for enabling the space above the sieve pore partition plate to be stable and avoiding disturbance, wherein the diameter of the holes formed on the stainless steel plate is 13-25 mm.

Preferably, the holes on the stainless steel plate are arranged in a regular triangle, and the arrangement interval h of the holes is 39-40 mm.

Preferably, the bottom of the vertical container shell is also provided with a purified water outlet, the bottom of the compact air floatation tank is connected with the primary separation assembly, a pipeline of the purified water outlet is connected with the dissolved air pump through a three-way type return pipe, the return pipe is also provided with an air inlet, and the other end of the dissolved air pump is connected with a sewage inlet of the water conduit.

Compared with the prior art, the invention has the beneficial effects that:

the compact gas flotation separation device reduces the oil content in water to 0.5mg/L by adjusting the pressure, the backwater proportion and the dissolved air quantity to the optimal working condition, and reduces the oil content to 4.7mg/L by adjusting the parameters of each working condition to the unfavorable conditions, so that the environmental protection standard is completely met, and sufficient safety margin is reserved, which cannot be achieved by the conventional separation means.

Meanwhile, compared with box-type air flotation, the compact gas flotation separation device has compact design of the whole set of equipment, the efficiency is improved by the air flotation superposition rotational flow effect, the problems of uneven gas distribution, large disturbance of a stable area and the like are avoided, the volume and the cost are greatly reduced under the same treatment capacity, especially under the condition of large treatment capacity, the check is carried out according to the efficiency of the equipment, the value of the oil separated from the production water is less abundant except that the cost of purchasing, operation and the like of the equipment is offset, the waste is really changed into wealth, and the small equipment volume enables the oil to be changed into the valuable in certain places with short space and precious space, such as offshore drilling platforms, floating production storage vessels FPSOs, equipment replacement, transformation, equipment addition and the like, so that huge advantages and commercial values are shown.

Drawings

FIG. 1 is a schematic flow diagram of the novel invention;

FIG. 2 is a schematic diagram of the compact air-bearing tank of the novel aspect of the present invention;

FIG. 3 is a structural diagram of a water distribution assembly in the novel cloth of the present invention;

FIG. 4 is a structural view of a water distribution pipe in the novel cloth of the present invention;

FIG. 5 is a schematic view of the structure of the novel cyclone air floating cover of the present invention;

fig. 6 is a diagram of the opening of the sieve pore separator in the novel cloth of the invention.

In the figure: 1. a water conduit; 2. a water distributor; 3. a water distribution pipe; 4. a rotational flow air flotation cover; 5. a sieve mesh partition plate; 6. a secondary separation space; 7. a vertical vessel shell; 8. a return pipe; 9. dissolved air pump.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that in the description of the present invention, the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, which are only for convenience of description and simplification of description, and do not indicate or imply that the referred device or element must have a specific orientation, be configured in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.

Further, it will be appreciated that the dimensions of the various elements shown in the figures are not drawn to scale, for ease of description, e.g., the thickness or width of some layers may be exaggerated relative to other layers.

It should be noted that like reference numerals and letters refer to like items in the following figures, and thus, once an item is defined or illustrated in one figure, it will not need to be further discussed or illustrated in detail in the description of the following figure.

As shown in fig. 1 to 6, the present invention provides a technical solution: compact gas flotation separation device, including vertical container shell 7, sieve mesh baffle 5, whirl air supporting cover 4, the compact air supporting jar that water distributor 2 and leading water pipe 1 are constituteed, sieve mesh baffle 5 fixed connection is in vertical container shell 7 inner wall, 4 fixed connection in sieve mesh baffle 5 bottoms of whirl air supporting cover, wherein, water distributor 2 and water distributor 3 set up in 4 bottom inner walls of whirl air supporting cover, leading water pipe 1 fixed connection in vertical container shell 7 bottom and top and water distributor 2 fixed connection.

As shown in fig. 1 to 6, in order to ensure the smooth implementation of this embodiment, it is necessary to know that a secondary separation space 6 is formed between the upper part of the sieve pore partition 5 and the vertical container shell 7, for the oil-water to be gathered and layered, and a stable oil phase is formed in the secondary separation space 6 and discharged from the oil-gas outlet at the top of the vertical container shell 7.

As shown in fig. 1 to 6, it is necessary to know about this solution that the cyclone air floating cover 4 has a conical structure with a large lower part and a small upper part, wherein the bottom plate of the cyclone air floating cover 4 has a ladder shape with a high middle part and a low periphery.

As shown in fig. 1 to fig. 6, further, an included angle α is formed between the bottom plate of the cyclone air floating cover 4 and the side wall of the cyclone air floating cover 4, α is set to be 73 ° to 86 °, a cone shell contraction angle of the side wall of the cyclone air floating cover 4 is set to be β, and β is set to be 53 ° to 78 °.

As shown in fig. 1 to 6, preferably, the top of the swirling flow air floating cover 4 is welded with the sieve pore partition plate 5, and the bottom plate of the swirling flow air floating cover 4 is welded and sealed with the top of the water conduit 1.

As shown in fig. 1 to 6, it should be noted that, in addition, the lowest part of the bottom plate edge of the cyclone air-floating cover 4 is provided with a sewage discharge pipe which is communicated with the vertical container shell 7 and used for discharging sediments, the material of the sewage discharge pipe is 316 stainless steel, and the inside of the sewage discharge pipe is subjected to high-precision polishing treatment for reducing the cyclone resistance.

As shown in fig. 1 to 6, further, the water distributor 2 and the water distributor 3 form a water distribution assembly through which the oily sewage supplied from the water conduit 1 is divided.

As shown in fig. 1 to fig. 6, it is also necessary to know about the solution that the end of the water distributor 3 is inclined upward, the inclination angle is set to θ, and θ takes 5 to 15 °.

As shown in fig. 1 to 6, further, the sieve pore partition 5 is made by opening holes on a circular stainless steel plate for stabilizing the space above the sieve pore partition 5 and preventing disturbance, wherein the diameter of the holes opened on the stainless steel plate is between 13 and 25 mm.

As shown in fig. 1 to 6, further, the holes on the stainless steel plate are arranged in a regular triangle, and the arrangement distance h of the holes is 30 to 40mm.

As shown in fig. 1 to fig. 6, it is further required to be known about the solution that a purified water outlet is further provided at the bottom of the vertical container housing 7, the bottom of the compact floatation tank is connected to the primary separation assembly, a pipeline of the purified water outlet is connected to the dissolved air pump 9 through a three-way return pipe 8, the return pipe 8 is further provided with an air inlet, and the other end of the dissolved air pump 9 is connected to a sewage inlet of the water conduit 1.

The following detailed description of the novel embodiments of the present invention will be made in conjunction with the accompanying drawings and the experimental case of the prolonged oilfield in 2022, month 4. As shown in fig. 1 and 2, the compact air flotation device comprises a compact air flotation tank composed of a water conduit 1, a water distribution assembly, a rotational flow air flotation cover 4, a sieve pore partition plate 5 and a vertical container shell 7, and a set of flotation separation device with complete functions is formed by matching a return pipe 8, a dissolved air pump 9 and an inlet and outlet pipeline. As shown in figure 3, the water distribution assembly is composed of a water distribution distributor 2 and a water distribution pipe 3, the water distribution distributor 2 is communicated with a water conduit 1 in a welding mode, the water conduit 1 is arranged at the bottom of the air floatation tank, and oily sewage entering the air floatation tank can enter the water distribution distributor through the water conduit 1 to be distributed, so that liquid can enter the bottom of the air floatation tank, and the space of the tank body is fully utilized. As shown in FIG. 4, the water outlet at the end of the water distribution pipe 3 is provided with a deflection angle theta upwards, and the deflection angle is preferably 5-15 degrees.

As shown in fig. 5, the cyclone air-bearing cover 4 is a tapered structure with a large bottom and a small top, the bottom sealing plate is provided with a slope angle α with a high center and a low periphery, the slope angle α is 73-86 degrees, and the tapered shell is provided with a contraction angle β, the contraction angle β is 53-78 degrees. The top of the air floating cover is welded with the sieve mesh partition plate 5, the bottom sealing plate is welded and sealed with the water conduit 1, and the bottom sealing plate is used for discharging sediments except the vertical container shell 7 provided with a sewage discharge pipe communicating pipeline at the lowest level, the materials are 316 stainless steel, and the whole inside high-precision polishing treatment is performed to reduce the rotational flow resistance.

As shown in fig. 6, the sieve pore partition plate is made by opening holes on a circular stainless steel plate, and the diameter of the opening hole cannot be too large to ensure stable flow of the upper space of the partition plate and avoid disturbance, and is 13-25 mm; on the other hand, the fluid can smoothly pass through the sieve pore partition plates 5, the holes are arranged in a regular triangle, and the arrangement distance h is 30-40 mm.

The air pump 9 dissolves the air into the return water supplied by the return pipe 8 to reach a saturated state, the return water pressure at the outlet of the pump is high, and the solubility is high, so that a large amount of air is dissolved; the return water and the inlet sewage are mixed and then enter the air floatation tank, and the water distribution component is introduced by the water conduit 1 to carry out uniform guidance water distribution. Because the pressure in the air-floating tank is low and is close to the normal pressure, the gas solubility is very low, the gas dissolved in the oil-containing sewage is quickly separated out, fine and dense bubbles are generated and float upwards, an oil-in-water type structure is broken in the bubble generation process, fine oil drops begin to be aggregated into larger oil drops, and the oil drops are more easily combined with the fine bubbles and are brought to the upper layer because the viscosity and the surface tension of the oil drops are far greater than those of water. The water distribution pipe 3 has the flow guiding function to make the mixed liquid generate rotational flow in the rotational flow air floating cover 4, the oil separated by floating is separated from the water for the first time by utilizing the density difference of oil and water, the water density is gathered by the outer side of the rotational flow air floating cover under the action of rotational flow centrifugal force, the oil is gathered to the center of the rotational flow, the taper of the air floating cover is strengthened and maintains the rotational speed of the rotational flow, and the sedimentary impurities sink to the bottom of the rotational flow cover and are discharged through a sewage outlet. Be equipped with sieve mesh baffle 5 at the top of air supporting cover, separate the whirl and play the effect of circulation when avoiding the upper portion space disturbance in the air supporting cover, secondary separation space 6 is left on 5 upper portions of sieve mesh baffle, the flow is stable in this space, the disturbance is few, drive under gravity and microbubble tension, the gathering layering appears in the profit, the headspace gathering forms stable oil phase, discharge through the oil gas export, and water then gathers in the lower floor, flow into tank bottoms portion through sieve mesh baffle 5, discharge through the water purification export. A return pipe 8 is led out from the purified water outlet pipeline to provide return water required by dissolved air for the dissolved air pump 9.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. Compact gas flotation separation device, including the compact air supporting jar that vertical container shell (7), sieve mesh baffle (5), whirl air supporting cover (4), water distribution distributor (2) and leading water pipe (1) are constituteed, its characterized in that: the sieve pore partition plate (5) is fixedly connected to the inner wall of the vertical container shell (7);

the cyclone air-floating cover (4) is fixedly connected to the bottom of the sieve mesh partition plate (5), wherein the water distribution distributor (2) and the water distribution pipes (3) are arranged on the inner wall of the bottom of the cyclone air-floating cover (4);

the water conduit (1) is fixedly connected with the bottom of the vertical container shell (7) and the top of the water conduit is fixedly connected with the water distributor (2).

2. The compact gas flotation separation device of claim 1, wherein: and a secondary separation space (6) is formed between the upper part of the sieve pore partition plate (5) and the vertical container shell (7) and is used for enabling oil and water to be gathered and layered, a stable oil phase is formed in the secondary separation space (6) and is discharged from an oil and gas outlet at the top of the vertical container shell (7).

3. The compact gas flotation separation device of claim 1, wherein: the cyclone air-floating cover (4) is of a conical structure with a large bottom and a small top, wherein the bottom plate of the cyclone air-floating cover (4) is in a ladder shape with a high middle and a low periphery.

4. The compact gas flotation separation device of claim 1, wherein: an included angle alpha is formed between the bottom plate of the rotational flow air floating cover (4) and the side wall of the rotational flow air floating cover (4), and the value of the alpha is 73-86 degrees;

the contraction angle of the conical shell of the side wall of the rotational flow air floating cover (4) is set to be beta, and the beta value is 53-78 degrees.

5. The compact gas flotation separation device of claim 1, wherein: the top of the rotational flow air floating cover (4) is welded with the sieve mesh partition plate (5), and the bottom plate of the rotational flow air floating cover (4) is welded and sealed with the top of the water conduit (1).

6. The compact gas flotation separation device of claim 1, wherein: the lowest position of the edge of the bottom plate of the rotational flow air floating cover (4) is provided with a sewage discharge pipe, the sewage discharge pipe is communicated with the vertical container shell (7) and used for discharging sediments, the material of the sewage discharge pipe is 316 stainless steel, and the whole interior is polished with high precision and used for reducing rotational flow resistance.

7. The compact gas flotation separation device of claim 1, wherein: the water distribution distributor (2) and the water distribution pipes (3) form a water distribution assembly, and oily sewage supplied by the water guide pipes (1) is distributed through the water distribution assembly.

8. The compact gas flotation separation device of claim 1, wherein: the tail end of the water distribution pipe (3) is arranged in an upward inclined mode, the inclined angle is theta, and the theta takes 5-15 degrees.

9. The compact gas flotation separation device of claim 1, wherein: the sieve mesh partition plate (5) is made by opening holes in a circular stainless steel plate and is used for enabling the space above the sieve mesh partition plate (5) to be stable and avoiding disturbance, wherein the diameter of the holes formed in the stainless steel plate is 13-25 mm.

10. The compact gas flotation separation device of claim 9, wherein: the holes on the stainless steel plate are arranged in a regular triangle, and the arrangement distance h of the holes is 30-40 mm.

11. The compact gas flotation separation device of claim 1, wherein: the bottom of the vertical container shell (7) is also provided with a purified water outlet, and the bottom of the compact air floatation tank is connected with a primary separation assembly;

the pipeline of the purified water outlet is connected with the dissolved air pump (9) through a three-way type return pipe (8), the return pipe (8) is also provided with an air inlet, and the other end of the dissolved air pump (9) is connected with the sewage inlet of the water conduit (1).