CN115477354A - Compact gas flotation separation device - Google Patents

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 technique

Under the call of "lucid waters and lush mountains are golden mountains and silver mountains", environmental protection requirements are becoming increasingly stringent, and enforcement is gradually increasing. The production water of oil and gas fields, coal bed methane, coal chemical industry, etc. contains a small amount of oil, usually less than 0.5%. Although the economic value is not high, it far exceeds the environmental protection standard of ≤30mg/L oil content in production water and must be treated. This kind of production water belongs to the "oil-in-water" mixed liquid, and gravity separation with conventional horizontal or vertical separators has little effect. A small number of manufacturers use box-type air flotation to remove impurities. The effect of fine particle impurities is good, but the separation efficiency of pure flotation is not high for the production of water with a small amount of oil. The volume of the equipment is very large under the large processing capacity, and the large volume will cause uneven distribution of air bubbles and fusion of air bubbles. question. On the other hand, the large disturbance in the oil-water stratification area is not conducive to the continuous and stable separation of oil and water, and the oil content of the treated water is prone to intermittently exceeding the standard.

Contents of the invention

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

In order to achieve the above object, the present invention provides the following technical solutions: a compact gas flotation separation device, which includes a vertical container shell, a sieve partition, a cyclone air flotation cover, a water distribution distributor and a water diversion pipe. tank, the sieve partition is fixedly connected to the inner wall of the vertical container shell, and the swirl air flotation cover is fixedly connected to the bottom of the sieve partition, wherein the water distribution distributor and the water distribution pipe are arranged on the bottom inner wall of the swirl air flotation cover, and the water diversion pipe It is fixedly connected to the bottom of the vertical container shell and the top is fixedly connected to the water distribution distributor.

Preferably, a secondary separation space is formed between the upper part of the sieve partition and the vertical container shell, which is used to cause the oil and water to gather and stratify, and form a stable oil phase in the secondary separation space, from which the vertical container The oil and gas outlet on the top of the shell is discharged.

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

Preferably, there is an angle α between the bottom plate of the swirl air flotation hood and the side wall of the swirl air flotation hood, and the value of α is between 73° and 86°, and the conical shrinkage angle of the side wall of the swirl air flotation hood is set to is β, and the value of β is between 53° and 78°.

Preferably, the top of the cyclone air flotation cover is welded to the screen partition, and the bottom plate of the cyclone air flotation cover is welded and sealed to the top of the water diversion pipe.

Preferably, the bottom edge of the cyclone air flotation cover is provided with a sewage pipe at the lowest point, and the sewage pipe is connected to the outside of the vertical container shell for sediment discharge. Small swirl resistance.

Preferably, the water distribution distributor and the water distribution pipe form a water distribution assembly, and the oily sewage supplied by the water diversion pipe is diverted through the water distribution assembly.

Preferably, the end of the water distribution pipe is inclined upward, and the inclination angle is set to θ, and θ is 5° to 15°.

Preferably, the sieve partition is made by opening holes on a circular stainless steel plate, which is used to stabilize the flow in the space above the sieve partition and avoid disturbance, wherein the diameter of the holes opened on the stainless steel plate is between 13 and between 25mm.

Preferably, the openings on the stainless steel plate are arranged in an equilateral triangle, and the spacing h between the openings is 39-40 mm.

Preferably, the bottom of the vertical container shell is also provided with a clean water outlet, the bottom of the compact air flotation tank is connected to the primary separation assembly, the pipeline of the clean water outlet is connected to the dissolved air pump through a three-way return pipe, and the backflow An air inlet is also arranged on the pipe, and the other end of the dissolved air pump is connected with the sewage inlet of the water diversion pipe.

Compared with prior art, the beneficial effect of the present invention is:

This compact gas flotation separation device reduces the oil content in the water to 0.5mg/L by adjusting the pressure, return water ratio, and dissolved gas to the optimal working condition, and when the working condition parameters are adjusted to unfavorable conditions , the oil content is reduced to 4.7mg/L, fully meeting the environmental protection standard, and leaving a sufficient safety margin, which cannot be achieved by conventional separation methods.

At the same time, compared with the box-type air flotation device, this compact gas flotation separation device has a compact design. The air flotation superimposed swirling effect improves efficiency while avoiding problems such as uneven gas distribution and large disturbance in the stable zone. The same processing capacity The volume and cost are greatly reduced, especially in the case of large processing capacity. The calculation is based on the efficiency of the equipment. The value of the oil separated from the production water can offset the cost of equipment purchase and operation, and there is still a small amount of wealth. Turning waste into treasure, the small size of equipment makes it possible to show huge advantages and commercial value in places where space is tight and space is precious, such as offshore drilling platforms, floating production and storage vessels FPSO, equipment replacement and modification, and equipment addition. .

Description of drawings

Fig. 1 is the novel principle flowchart of the present invention;

Fig. 2 is the structural representation of the compact air flotation tank in the novel of the present invention;

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

Fig. 4 is the structural diagram of the water distribution pipe in the novel cloth of the present invention;

Fig. 5 is a structural schematic diagram of the novel cyclone air flotation cover of the present invention;

Fig. 6 is a diagram of the opening of the screen partition in the novel cloth of the present invention.

In the figure: 1. Water diversion pipe; 2. Water distribution distributor; 3. Water distribution pipe; 4. Swirling air flotation cover; 5. Sieve partition; 6. Secondary separation space; 7. Vertical container shell; 8 , Return pipe; 9, dissolved air pump.

detailed description

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to 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", The orientation or positional relationship indicated by "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, not to indicate or imply the referred device Or elements must have a particular orientation, be constructed and operate in a particular orientation, and therefore should not be construed as limiting the invention.

In addition, it should be understood that, for the convenience of description, the dimensions of the various components shown in the drawings are not drawn according to the actual scale relationship, for example, the thickness or width of some layers may be exaggerated relative to other layers.

It should be noted that similar reference numerals and letters denote similar items in the following drawings, therefore, once an item is defined or described in one drawing, it will not need to be redefined in the description of subsequent drawings. It is further discussed and described in detail.

As shown in Figures 1 to 6, the present invention provides a technical solution: a compact gas flotation separation device, including a vertical container shell 7, a screen partition 5, a swirling air flotation cover 4, and a water distributor 2 The compact air flotation tank composed of the water diversion pipe 1, the screen partition 5 is fixedly connected to the inner wall of the vertical container shell 7, and the swirl air flotation cover 4 is fixedly connected to the bottom of the screen partition 5, wherein the water distributor 2 And the water distribution pipe 3 is arranged on the inner wall of the bottom of the cyclone air flotation cover 4, the water diversion pipe 1 is fixedly connected to the bottom of the vertical container shell 7 and the top is fixedly connected to the water distribution distributor 2.

As shown in Figures 1 to 6, in order to ensure the smooth implementation of this embodiment, it needs to be known that a secondary separation space 6 is formed between the top of the sieve partition 5 and the vertical container shell 7, which is used to make oil and water Aggregation and stratification occurs, and a stable oil phase is formed in the secondary separation space 6, which is discharged from the oil and gas outlet on the top of the vertical container shell 7.

As shown in Figures 1 to 6, what needs to be known about this solution is that the swirl air flotation cover 4 has a conical structure with a large bottom and a small top, wherein the bottom plate of the swirl air flotation cover 4 is in the shape of a trapezoid with a high middle and low surroundings.

As shown in Figures 1 to 6, further, there is an angle α between the bottom plate of the swirl air flotation cover 4 and the side wall of the swirl air flotation cover 4, and the value of α is between 73° and 86°. The contraction angle of the conical shell on the side wall of the floating cover 4 is set to β, and the value of β is between 53° and 78°.

As shown in FIGS. 1 to 6 , preferably, the top of the swirl air flotation cover 4 is welded to the screen partition 5 , and the bottom plate of the swirl air flotation cover 4 is welded and sealed to the top of the water diversion pipe 1 .

As shown in Figures 1 to 6, in addition, what needs to be known is that the bottom edge of the swirl air flotation cover 4 is provided with a drainpipe, and the drainpipe is connected to the outside of the vertical container housing 7 for sediment discharge. The material is 316 stainless steel, and all the interiors are polished with high precision to reduce the swirling resistance.

As shown in Figures 1 to 6, further, the water distribution distributor 2 and the water distribution pipe 3 form a water distribution assembly, and the oily sewage supplied by the water diversion pipe 1 is diverted through the water distribution assembly.

As shown in Figures 1 to 6, what needs to be known about this solution is that the end of the water distribution pipe 3 is inclined upwards, and the inclination angle is set to θ, and θ takes a value of 5° to 15°.

As shown in Figures 1 to 6, furthermore, the screen partition 5 is made by opening holes on a circular stainless steel plate, which is used to stabilize the flow in the space above the screen partition 5 and avoid disturbance. The diameter of the holes opened on the board is between 13mm and 25mm.

As shown in Figures 1 to 6, furthermore, the openings on the stainless steel plate are arranged in an equilateral triangle, and the spacing h between the openings is 30-40 mm.

As shown in Figures 1 to 6, in addition, what needs to be known about this solution is that the bottom of the vertical container housing 7 is also provided with a clean water outlet, and the bottom of the compact air flotation tank is connected to the primary separation assembly, and the clean water The outlet pipeline is connected with the dissolved air pump 9 through the three-way return pipe 8, and 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 diversion pipe 1.

The specific implementation of the new invention will be described in detail below in conjunction with the accompanying drawings and the case of implementing the experiment in Yanchang Oilfield in April 2022. As shown in Figure 1 and Figure 2, the compact air flotation device consists of a water diversion pipe 1, a water distribution assembly, a swirl air flotation cover 4, a screen partition 5, and a vertical container shell 7 to form a compact air flotation tank, and through Equipped with return pipe 8, dissolved air pump 9 and inlet and outlet pipelines to form a set of flotation separation device with complete functions. As shown in Figure 3, the water distribution component is composed of a water distribution distributor 2 and a water distribution pipe 3. The water distribution distributor 2 is connected to the water diversion pipe 1 by welding, and the water diversion pipe 1 is arranged at the bottom of the air flotation tank, and the oily sewage entering the air flotation tank can pass through The water diversion pipe 1 enters the water distribution distributor for shunting, realizes liquid entering at the bottom, and makes full use of the space of the tank body. As shown in Figure 4, the water outlet at the end of the water distribution pipe 3 is provided with an upward deflection angle θ, and the deflection angle should be 5-15°.

As shown in Figure 5, the swirl air flotation cover 4 is a cone-shaped structure with a large bottom and a small top. The bottom sealing plate is set with a slope angle α that is high in the center and low in the surroundings, and the value is between 73° and 86°. The conical shell is set at a contraction angle β , taking a value between 53° and 78°. The top of the air flotation cover is welded to the sieve partition 5, the bottom sealing plate is welded and sealed to the water diversion pipe 1, and the lowest sealing plate at the bottom is provided with a sewage pipe connecting the vertical container shell 7 for sediment discharge, and the material is 316 Stainless steel, all internal high-precision polishing treatment, reducing swirl resistance.

As shown in Figure 6, the sieve partition is made by opening holes in a circular stainless steel plate. In order to stabilize the flow in the upper space of the partition and avoid disturbance, the diameter of the opening should not be too large, and the value is 13-25mm; on the other hand It is necessary to ensure that the fluid can pass through the sieve partition 5 smoothly, the openings are arranged in an equilateral triangle, and the arrangement spacing h is 30-40mm.

The dissolved air pump 9 dissolves air into the return water supplied by the return pipe 8 to reach saturation. The return water at the outlet of the pump has high pressure and high solubility, so a large amount of air is dissolved; the return water is mixed with the imported sewage and then enters the air flotation tank. Introduce it into the water distribution assembly for uniform directional water distribution. Due to the low pressure in the air flotation tank, which is close to normal pressure, and the gas solubility is very low, the gas dissolved in the oily sewage is precipitated rapidly, producing fine and dense bubbles and floating up, and the "oil-in-water" structure is broken during the process of generating bubbles. Fine oil droplets begin to coalesce into larger oil droplets, and because the viscosity and surface tension of oil droplets are much greater than those of water, they are more likely to combine with fine air bubbles and be carried to the upper layer. The diversion effect of the water distribution pipe 3 causes the mixed liquid to generate a swirl in the swirl air flotation cover 4, and the oil and water density difference is used to separate the flotation oil from the water once. The air flotation cover gathers outside, while the oil gathers towards the center of the swirl flow, the taper of the air flotation cover strengthens and maintains the swirl speed, and the sedimentary impurities sink to the bottom of the swirl cover and are discharged through the sewage outlet. A sieve partition 5 is arranged on the top of the air flotation hood, which isolates the swirl in the air flotation hood to avoid disturbance in the upper space and at the same time plays a role in circulation. The upper part of the sieve partition 5 leaves a secondary separation space 6, which The flow in the space is stable with little disturbance. Driven by gravity and micro-bubble tension, the oil and water appear to accumulate and stratify, and the head space accumulates to form a stable oil phase, which is discharged through the oil and gas outlet, while the water accumulates in the lower layer and passes through the sieve partition 5 It flows into the bottom of the tank and is discharged through the clean water outlet. On the clean water outlet pipeline, a return pipe 8 is drawn to provide the return water needed for dissolved air for the dissolved air pump 9 .

Although the embodiments of the present invention have been shown and described, those skilled in the art can understand that various changes, modifications and substitutions can be made to these embodiments without departing from the principle and spirit of the present invention. and modifications, the scope of the invention is defined by the appended claims and their equivalents.

Claims (11)

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).

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