Evaporating pipe structural member for treating thickened oil produced water and falling film evaporator

Abstract

The invention belongs to the technical field of sewage treatment, and particularly relates to an evaporating pipe structural member for treating thickened oil produced water and a falling film evaporator. The evaporation pipe structural member comprises a pipe body; the spiral guide vanes are evenly arranged in the pipe body in the circumferential direction, the central axis of each spiral guide vane is parallel to the central axis of the pipe body, and fluid flowing downwards along the pipe wall of the pipe body can flow through the spiral guide vanes to generate rotational flow. According to the invention, the thickened oil produced water can be treated, and the treatment efficiency is improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of sewage treatment, and specifically relates to an evaporation tube structural member for treating produced water from heavy oil production and a falling film evaporator equipped with the evaporation tube structural member. Background Art

[0002] A large amount of wastewater generated from heavy oil thermal recovery in oilfields must be separated before it can be recycled. There are many methods for recycling, mainly membrane method and thermal method. These two methods are applied both at home and abroad. Relevant engineering examples have been partially applied in Canada, the United States, the United Kingdom, etc. However, since most oil production abroad is carried out during the low water cut period and the remaining sewage volume is small, this technology has not been widely used in the oilfield field.

[0003] At the same time, there are also many problems in the adaptability and operation of the membrane method process and the conventional thermal method process for treating oilfield sewage. Therefore, it is necessary to optimize the treatment process and shorten the process flow.

[0004] The membrane method process refers to filtering water using a membrane made of special materials. The main disadvantages are as follows: 1. The requirement for the quality of influent water is high, and for oilfield sewage, a complex pretreatment process is required to meet the requirements; 2. The service life of the membrane is short, and the membrane needs to be replaced every 3 - 5 years, with high costs and a large amount of maintenance work; 3. For oilfield sewage, the concentration multiple is low, and a large amount of concentrated water needs to be discharged; 4. It is extremely easy to be polluted. If the influent water quality does not meet the standard, it may cause membrane damage; 5. The reverse osmosis operating pressure is high, and the working pressure is 10 - 20 MPa, with high energy consumption; 6. It is difficult to remove small molecule organic substances, and the effluent water quality is poor; 7. The temperature of oilfield sewage is relatively high, especially heavy oil sewage, and it needs to be cooled before membrane treatment.

[0005] The disadvantages of the conventional thermal method are as follows: 1. Forced circulation evaporation requires about 300 times the amount of circulating water, with high energy consumption and large equipment; 2. The multi-effect evaporation process requires a steam source, and at the same time, the temperature difference is small, the heat transfer efficiency is low, the heat transfer area is large, the equipment volume is large, and the investment is high.

[0006] When the influent water is produced water from heavy oil production and the produced water is required to meet the boiler water demand, the present invention can shorten the process, extend the maintenance period, and ultimately achieve a more economical and environmentally friendly effect. Summary of the Invention

[0007] Aiming at the above-mentioned technical problems, the present invention aims to provide an evaporation tube structural member for treating produced water from heavy oil production, which can improve the treatment efficiency of sewage.

[0008] The present invention also provides a falling film evaporator, which can treat produced water from heavy oil production, improve the treatment efficiency, and avoid the corrosion of the evaporation tube structural member by pollutants and scaling ions.

[0009] According to the present invention, there is provided an evaporation tube structural member for treating viscous oil produced water, comprising:

[0010] a tube body; and

[0011] a plurality of spiral guide vanes uniformly arranged in the circumferential direction inside the tube body, the central axis of the spiral guide vane being parallel to the central axis of the tube body, and the fluid flowing downward along the tube wall of the tube body can flow through the spiral guide vane and generate a swirl.

[0012] According to the present invention, during the working process of the evaporation tube structural member, the sewage to be treated flows downward along the tube wall of the tube body, and a flowing thin film will be formed on the tube wall of the tube body by the sewage to be treated. The sewage to be treated flows in a film on the tube wall of the tube body, which can increase the contact area between the sewage to be treated and the tube body. At this time, heating the tube body can enable the heat to be fully exchanged with the sewage to be treated, so that the sewage to be treated can be quickly heated up. After the sewage to be treated is heated up, the water in it becomes water vapor, and most of the water vapor is separated from the sewage, and the remaining small part of the water vapor still continues to flow downward along the tube body under the entrainment of the sewage.

[0013] During the process of the sewage entraining water vapor flowing downward along the tube body, it will pass through the spiral guide vane. After the sewage entraining water vapor enters the spiral guide vane, it generates a swirl under the action of the spiral guide vane and spirals downward. At this time, due to the action of centrifugal force, the liquid phase density in the sewage entraining water vapor is greater than that of the water vapor, so the liquid phase will be radially thrown to the inner wall of the tube body, thereby separating the water vapor from the liquid phase and improving the efficiency of sewage treatment.

[0014] In a preferred embodiment, it further includes an annular plate arranged above the spiral guide vane, a plurality of the spiral guide vanes are uniformly arranged in the circumferential direction of the annular plate at the lower part of the annular plate, and a plurality of liquid inlets corresponding to the spiral guide vanes one by one are arranged on the annular plate.

[0015] In a preferred embodiment, the central axis of each spiral guide vane coincides with the central axis of its corresponding liquid inlet.

[0016] In a preferred embodiment, it further includes a plurality of cylinders corresponding to the spiral guide vanes one by one, the spiral guide vanes are spirally arranged outside the cylinders, and the central axis of the spiral guide vane coincides with the central axis of its corresponding cylinder.

[0017] In a preferred embodiment, the outer dimension of the cylinder is smaller than the dimension of the liquid inlet.

[0018] In a preferred embodiment, the upper end of the cylinder extends into the liquid inlet.

[0019] In a preferred embodiment, the outer circumferential wall of the annular plate is sealingly connected to the inner wall of the pipe body.

[0020] In a preferred embodiment, the angle range between the blades of the spiral guide vane and the horizontal plane is 25° to 35°.

[0021] According to the present invention, there is also provided a falling film evaporator, including an evaporator housing, and a plurality of evaporation pipe structural members for treating viscous oil produced water provided according to the present invention are arranged in the evaporator housing.

[0022] In a preferred embodiment, the central axes of the evaporation pipe structural members coincide with the central axis of the evaporator housing, and a heat source inlet and outlet for heating the evaporation pipe structural members is provided on the outer wall of the evaporator housing.

[0023] Compared with the prior art, the advantages of the present application are as follows.

[0024] During the working process, the sewage to be treated flows downward along the inner wall of the pipe body. At this time, the pipe body is heated by an external heat source, and the external heat is transferred to the inside of the pipe body. The sewage flowing in a film along the inner wall of the pipe body can have a large contact area with the heat source, thereby improving the heat exchange efficiency and enabling the sewage to be quickly heated. After the sewage is heated, the water in it is converted into water vapor. Most of the water vapor separates from the sewage, and a small part of the water vapor still moves downward along the pipe body under the entrainment of the sewage. Subsequently, the sewage entraining the water vapor, during the flowing process, passes through the spiral guide vane, and under the action of the spiral guide vane, the water vapor entrained in the sewage is completely separated, thereby improving the efficiency of sewage treatment. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The present invention will be described below with reference to the accompanying drawings.

[0026] Figure 1 Shows a schematic diagram of an embodiment of an evaporation pipe structural member for treating viscous oil produced water according to the present invention;

[0027] Figure 2 Shows a schematic diagram of an embodiment of a spiral guide vane, an annular plate and a cylinder according to the present invention;

[0028] Figure 3 Shows a schematic top view structure diagram of an embodiment of a falling film evaporator according to the present invention.

[0029] In the figure:

[0030] 400. Evaporation pipe structural member;

[0031] 41. Pipe body; 42. Spiral guide vane; 43. Annular plate; 44. Liquid inlet; 45. Cylinder;

[0032] 51. Evaporator housing.

[0033] In this application, all the drawings are schematic and are only used to illustrate the principles of the present invention and are not drawn to actual scale. Detailed implementation manners

[0034] The present invention will be introduced below with reference to the drawings.

[0035] It should be noted that the directional terms or qualifiers such as "upper" and "lower" used in this application are all with reference to the Figure 1 stated object. They do not limit the absolute positions of the components involved, but can vary according to specific circumstances.

[0036] Figure 1 Shows the structure of the evaporation tube structure member 400 for treating produced water from heavy oil production according to the present invention. As Figure 1 shown, the evaporation tube structure member 400 includes a tube body 41 and a plurality of spiral guide vanes 42.

[0037] Specifically, as Figure 1 shown, in this embodiment, the tube body 41 is arranged as a hollow cylindrical structure, and the sewage to be treated (i.e., produced water from heavy oil production) can flow axially within the tube body 41.

[0038] Combined with Figure 1 and Figure 2 shown, a plurality of spiral guide vanes 42 are uniformly arranged on the inner wall of the tube body 41 in the circumferential direction, and the central axes of the respective spiral guide vanes 42 are all parallel to the central axis of the tube body 41.

[0039] According to the present invention, during the operation of the evaporation tube structure member 400, the sewage to be treated flows downward along the inner wall of the tube body 41, and a flowing thin film will be formed on the inner wall of the tube body 41 by the sewage to be treated. The sewage to be treated flows in a film on the inner wall of the tube body 41, which can increase the contact area between the sewage to be treated and the tube body 41. At this time, heating the tube body 41 can enable the heat to be fully exchanged with the sewage to be treated, causing the sewage to be treated to quickly rise in temperature. After the sewage to be treated rises in temperature, the water in it becomes water vapor, and most of the water vapor separates from the sewage, and the remaining small part of the water vapor still continues to flow downward along the tube body 41 under the entrainment of the sewage.

[0040] During the process of the sewage entraining water vapor flowing downward along the tube body 41, it will pass through the spiral guide vanes 42. After the sewage entraining water vapor enters the spiral guide vanes 42, it will swirl and spiral downward under the action of the spiral guide vanes 42. At this time, due to the action of centrifugal force, the liquid phase density in the sewage entraining water vapor is greater than that of the water vapor, so the liquid phase will be radially thrown towards the inner wall of the tube body 41, thereby separating the water vapor from the liquid phase and improving the efficiency of sewage treatment.

[0041] In this embodiment, four helical guide vanes 42 are evenly arranged in the circumferential direction. It should be noted that the number of helical guide vanes 42 in this embodiment is not used to limit the protection scope of the present invention. In combination with the present invention, the number of helical guide vanes 42 can be adjusted according to actual situations.

[0042] In a specific embodiment, the evaporation tube structure 400 further includes an annular plate 43 disposed above the helical guide vane 42.

[0043] As Figure 1 and Figure 2 shown, a plurality of helical guide vanes 42 are evenly arranged along the circumferential direction of the annular plate 43 at the lower part of the annular plate 43. Specifically, the annular plate 43 is arranged in a circular ring shape, that is, a through hole is provided at the center of the annular plate 43. The helical guide vane 42 is disposed on the lower end surface of the annular plate 43 and is located between the outer wall of the annular plate 43 and the wall of the through hole.

[0044] Furthermore, a plurality of liquid inlets 44 corresponding to the helical guide vanes 42 one by one are provided on the annular plate 43. As Figure 2 shown, the central axis of the liquid inlet 44 is parallel to the central axis of the annular plate 43 and is located between the outer wall of the annular plate 43 and the wall of the through hole.

[0045] In a preferred embodiment, the central axis of each helical guide vane 42 coincides with the central axis of its corresponding liquid inlet 44.

[0046] The outer wall of the annular plate 43 is hermetically connected to the inner wall of the pipe body 41. By providing the annular plate 43, on the one hand, the helical guide vanes 42 are fixedly arranged on the annular plate 43, and the annular plate 43 can provide a fixed basis for each helical guide vane 42. On the other hand, when the fluid moves downward along the inner wall of the pipe body 41 to the upper end surface of the annular plate 43, the fluid will flow through the liquid inlet 44 and then through the helical guide vane 42, so as to ensure that all the fluid can flow through the helical guide vane 42 and prevent the fluid from flowing downward through the gap between two adjacent helical guide vanes 42.

[0047] In a preferred embodiment, a plurality of protrusions (not shown in the figure) are arranged at intervals on the upper end surface of the annular plate 43, and the protrusions and the liquid inlets 44 are arranged alternately. The side surfaces of the plurality of protrusions are arranged as inclined surfaces or arc surfaces, and each liquid inlet 44 is arranged at the lower position of each inclined surface. In this setting, when the fluid flows along the pipe body 41 to the upper end surface of the annular plate 43, the plurality of inclined surfaces or arc surfaces can play a guiding role for the fluid, so that the fluid can smoothly flow into each liquid inlet 44 and then smoothly flow through the helical guide vane 42.

[0048] According to the present invention, the evaporation tube structure 400 further includes a plurality of cylinders 45 corresponding to the helical guide vanes 42 one by one. As Figure 2As shown, in this embodiment, the cylinder body 45 is arranged in a cylindrical shape, and the spiral guide vane 42 is spirally arranged on the outer side of the cylinder body 45. The central axis of the spiral guide vane 42 coincides with the central axis of the corresponding cylinder body 45. The upper end of the spiral guide vane 42 is fixedly connected to the annular plate 43. That is to say, the cylinder body 45 is connected to the annular plate 43 through the spiral guide vane 42.

[0049] In this embodiment, by arranging the cylinder body 45, the structure of the spiral guide vane 42 is further improved. The spiral guide vane 42 and the cylinder body 45 cooperate with each other, enabling the fluid to flow along the spiral guide vane 42 and ensuring that the fluid is finally ejected radially.

[0050] According to the present invention, in a preferred embodiment, the outer dimension of the cylinder body 45 is smaller than the dimension of the liquid inlet 44. With this arrangement, after the fluid passes through the liquid inlet 44, it can directly fall onto the spiral guide vane 42, avoiding falling onto the top end of the cylinder body 45.

[0051] In a preferred embodiment, the upper end of the cylinder body 45 extends into the liquid inlet 44. As Figure 2 shown, after the cylinder body 45 extends into the liquid inlet 44, the liquid inlet 44 forms an annular inlet. The outer wall of the annular inlet is the hole wall of the liquid inlet 44, and the inner wall of the annular inlet is the outer wall of the cylinder body 45.

[0052] With this arrangement, the sewage to be treated flows downward along the inner wall of the pipe body 41 to the upper end surface of the annular plate 43 and enters the liquid inlet 44. Then, the sewage to be treated can flow downward along the cylinder body 45 and then flow to the spiral guide vane 42. Through this arrangement, the momentum loss of the fluid can be reduced, so that the sewage to be treated can generate a faster swirling speed when flowing through the spiral guide vane 42.

[0053] According to the present invention, in a specific embodiment, the circumferential outer wall of the annular plate 43 is sealingly connected to the inner wall of the pipe body 41.

[0054] In a preferred embodiment, the angle range between the blade of the spiral guide vane 42 and the horizontal plane is 25° to 35°.

[0055] In this embodiment, the angle between the blade of the spiral guide vane 42 and the horizontal plane is 30°.

[0056] In an embodiment of the present invention, a falling film evaporator is provided. Figure 3 The cross-section of the falling film evaporator of the present invention is shown.

[0057] As Figure 3 shown, the falling film evaporator includes an evaporator housing 51, and a plurality of evaporation tube structural members 400 for treating heavy oil produced water provided according to the present invention are arranged in the evaporator housing 51.

[0058] Specifically, the evaporator housing 51 is arranged as a closed cylindrical empty shell structure. A plurality of evaporation tube structural members 400 are arranged in sequence inside the evaporator housing 51, and the central axis of the evaporation tube structural member 400 is parallel to the central axis of the evaporator housing 51.

[0059] Furthermore, heat source inlets and outlets for heating the evaporation tube structural members are provided on the outer wall of the evaporator housing 51. In this embodiment, the heat source inlets and outlets of the evaporator housing 51 are connected to a steam generator, and the steam generated by the steam generator can enter the evaporator housing 51. After the steam enters the evaporator housing 51, it will not enter the interior of the evaporation tube structural member 400, but only heats the evaporation tube structural member 400 outside the evaporation tube structural member 400.

[0060] In a specific embodiment, a baffle is hermetically arranged along the horizontal direction on the inner wall of the evaporator housing 51. The baffle is located at the top of the evaporation tube structural member 400, that is to say, the upper end surface of the baffle is flush with the upper end surface of the evaporation tube structural member 400.

[0061] Under the action of the baffle, after the sewage to be treated enters the evaporator housing 51 from above, it flows to the upper end surface of the baffle, and then enters through the upper end of the tube body 41 of the evaporation tube structural member 400. On the other hand, the heat source inlets and outlets are arranged below the baffle, so as to prevent the steam for heating generated by the steam generator from entering the evaporation tube structural member 400.

[0062] The working principle of the falling film evaporator of the present invention is as follows.

[0063] Use a steam generator to generate steam and make the steam enter the evaporator housing 51. After the steam enters the evaporator housing 51, it heats the evaporation tube structural member 400.

[0064] The sewage to be treated enters the evaporator housing 51 from above. After reaching the top of the evaporation tube structural member 400, it spreads out on the upper end surface of the baffle, and then slowly flows into the evaporation tube structural member 400. When the sewage to be treated flows in the tube body 41 of the evaporation tube structural member 400, a thin film can be formed on the inner wall of the tube body 41 for film flow, thereby increasing the contact area between the fluid and the tube body 41, and thus accelerating the heat exchange efficiency.

[0065] During the film flow process of the sewage to be treated, it is continuously heated, so that the water in it evaporates into water vapor and is separated from the sewage.

[0066] When the sewage flows through the spiral guide vane 42, a swirling flow occurs. Under the action of centrifugal force, some of the water vapor entrained in the sewage is separated, thereby improving the treatment efficiency of the sewage of the present invention.

[0067] In addition, the rotational flow of the sewage can effectively prevent the corrosion of the evaporation tube structure by pollutants and scaling ions.

[0068] According to the present invention, in a preferred embodiment, an ultrasonic flowmeter is provided outside the pipe body 41. The ultrasonic flowmeter can monitor the flow rate of the fluid in the pipe body 41, greatly improving the accuracy of flow rate detection. In this embodiment, the flow velocity range at the spiral guide vane 42 is 0.5 - 1 m / s. Preferably, the flow velocity range at the spiral guide vane 42 is 0.6 m / s.

[0069] In the description of the present invention, it should be understood that the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, "a plurality of" means two or more unless otherwise specifically defined.

[0070] In the present invention, unless otherwise clearly defined and limited, the terms "mounted", "connected", "coupled", "fixed" and the like should be construed in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the internal communication of two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0071] In the description of this specification, the descriptions with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0072] Finally, it should be noted that the above are only the preferred embodiments of the present invention and do not constitute any limitation to the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments, or perform equivalent substitution on some of the technical features. Any modification, equivalent substitution, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An evaporation tube structural member for treating heavy oil produced water, characterized in that, Comprising: A pipe body (41); And A plurality of helical guide vanes (42) uniformly arranged in the circumferential direction inside the pipe body (41), the central axis of the helical guide vane (42) being parallel to the central axis of the pipe body (41), and the fluid flowing downward along the pipe wall of the pipe body (41) can flow through the helical guide vane (42) to generate a swirl flow.

2. The evaporation tube structural member for treating heavy oil produced water according to claim 1, wherein It further includes an annular plate (43) arranged above the helical guide vane (42), and a plurality of the helical guide vanes (42) are uniformly arranged in the circumferential direction of the annular plate (43) at the lower part of the annular plate (43), and a plurality of liquid inlets (44) corresponding to the helical guide vanes (42) one by one are arranged on the annular plate (43).

3. The evaporating tube structural member for treating viscous oil produced water according to claim 2, wherein, The central axis of each helical guide vane (42) coincides with the central axis of its corresponding liquid inlet (44).

4. The evaporation tube structural member for treating heavy oil produced water according to claim 3, wherein It further includes a plurality of cylinders (45) corresponding to the helical guide vanes (42) one by one, the helical guide vanes (42) are helically arranged outside the cylinders (45), and the central axis of the helical guide vane (42) coincides with the central axis of its corresponding cylinder (45).

5. The evaporation tube structural member for treating heavy oil produced water according to claim 4, wherein The outer dimension of the cylinder (45) is smaller than the dimension of the liquid inlet (44).

6. The evaporation tube structural member for treating viscous oil produced water according to claim 5, characterized in that, The upper end of the cylinder (45) extends into the liquid inlet (44).

7. The evaporation tube structural member for treating heavy oil produced water according to claim 6, characterized in that The circumferential outer wall of the annular plate (43) is hermetically connected to the inner wall of the pipe body (41).

8. The evaporation tube structural member for treating heavy oil produced water according to any one of claims 1 to 7, characterized in that The included angle range between the blade of the helical guide vane (42) and the horizontal plane is 25° to 35°.

9. A falling film evaporator, characterized in that, Comprising an evaporator housing (51), and a plurality of evaporation pipe structural members for treating viscous oil produced water according to any one of claims 1 to 8 are arranged inside the evaporator housing (51).

10. The falling film evaporator according to claim 9, characterized in that, The central axis of each evaporation pipe structural member coincides with the central axis of the evaporator housing (51), and a heat source inlet and outlet for heating the evaporation pipe structural member is arranged on the outer wall of the evaporator housing (51).

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