A skid-mounted pre-filming device for conveying pipelines

Abstract

This invention discloses a skid-mounted pre-filming device for conveying pipelines. The device includes a cup-type pig and a sprayer. The cup-type pig moves along the conveying pipeline to clean it. The sprayer, mounted on the cup-type pig, contains a corrosion inhibitor and sprays it out through the pressure difference between the upstream and downstream sides of the cup-type pig. In water suction, cleaning, and pre-filming operations, the skid-mounted pre-filming device can at least complete the cleaning operation. Workers can select and combine different methods according to production needs, completing multiple operations simultaneously, shortening operation time, and reducing operating costs.

Description

Technical Field

[0001] This invention relates to the field of pre-filming equipment technology, and specifically to a skid-mounted conveying pipeline pre-filming device. Background Technology

[0002] CCUS (Carbon Capture, Utilization and Storage) technology is an important technology for achieving carbon peaking and carbon neutrality.

[0003] Currently, the main methods for transporting carbon dioxide in the application of CCUS technology are transportation and pipeline transportation. Transportation involves compressing carbon dioxide into a solid or liquid state, filling it into containers, and then transporting it. Pipeline transportation utilizes carbon dioxide pipelines for transport. For short-term carbon dioxide transport, transportation is more economical, while for long-term transport, pipelines are more efficient. Utilizing pipelines to transport carbon dioxide is a crucial part of achieving CCUS.

[0004] Once a carbon dioxide pipeline leaks, it directly impacts the environment near the leak point. One cause of carbon dioxide pipeline leaks is corrosion caused by carbon dioxide in a water-containing environment, leading to perforation or thinning of the pipe wall, reducing mechanical strength and triggering leaks. Applying corrosion inhibitors to the inside of the pipeline can slow down the corrosion process. Corrosion inhibitors are used on metal surfaces for protection; adding trace amounts or small quantities of corrosion inhibitors can significantly reduce the corrosion rate of metal materials in that medium. Summary of the Invention

[0005] The technical problem to be solved by the present invention is how to coat the inside of the pipeline with a corrosion inhibitor and form a corrosion inhibitor film. The purpose is to provide a skid-mounted pre-filming device for conveying pipelines to solve the above-mentioned problem.

[0006] This invention is achieved through the following technical solution:

[0007] A skid-mounted pre-filming device for a conveying pipeline includes a cup-type pig and a sprayer;

[0008] A cup-shaped pipeline cleaner is used to move along a delivery pipeline to clean it.

[0009] The sprayer is installed on the cup pig. The sprayer is used to hold the corrosion inhibitor and sprays the corrosion inhibitor through the pressure difference between the upstream and downstream of the cup pig.

[0010] In one possible design, the cup pig includes an intermediate cylinder, a front cup, and a rear cup;

[0011] The intermediate cylinder has a hollow structure and a partition plate inside; the intermediate cylinder has two opposite ends, and correspondingly, the front and rear cups are respectively set at the two ends of the intermediate cylinder;

[0012] Both the front and rear cups are used to clean the conveying pipeline, or the outer circumference of the front cup presses against the inner wall of the conveying pipeline and is used to clean the conveying pipeline, while the outer circumference of the rear cup abuts against the inner wall of the conveying pipeline and is used for corrosion inhibitor pre-filming.

[0013] Accordingly, the sprayer is mounted on the intermediate cylinder and positioned between the front and rear rubber cups.

[0014] In one possible design, one end of the middle tube extends beyond the front cup, and a water-absorbing bag is detachably provided on that end.

[0015] In one possible design, the sprayer includes a base and a piston;

[0016] The base cylinder is sleeved on the intermediate cylinder and has a front end and a rear end. The front end of the base cylinder is close to the rear cup and is connected to the conveying pipe through the pressure hole. The rear end of the base cylinder is close to the front cup and is provided with a spray hole facing the inner wall of the conveying pipe.

[0017] The piston is constructed in an annular shape and is slidably mounted on the base cylinder. A receiving cavity for accommodating corrosion inhibitor is formed between the piston and the tail end of the base cylinder. The pressure difference between the upstream and downstream of the pig cup is used to drive the piston to slide along the base cylinder so that the corrosion inhibitor is sprayed out from the spray hole.

[0018] Correspondingly, the intermediate cylinder is provided with a partition plate located between the first end of the base cylinder and the piston, and the intermediate cylinder is provided with a pressure-inducing hole located between the first end of the base cylinder and the partition plate. The pressure-inducing hole is used to convey the pressure difference between the upstream and downstream of the cup pig to the base cylinder.

[0019] In one possible design, two spaced-apart stop rings are provided on the inner wall of the base cylinder, and the piston is located between the two stop rings;

[0020] The base tube is also provided with a filling hole located between two stop rings and a detachable sealing plug on the filling hole, and the filling hole is located at the top of the base tube.

[0021] In one possible design, there are several spray holes evenly distributed around the tail end of the base cylinder, and the central angle of the spray range of the spray holes is 55°-60°.

[0022] In one possible design, the distance between the spray nozzle and the inner wall of the delivery pipe is 1-3 cm. Correspondingly, the tail end of the base cylinder is constructed as an outwardly convex annular structure so that the distance between the spray nozzle and the inner wall of the delivery pipe is 1-3 cm.

[0023] In one possible design, the capacity to accommodate the corrosion inhibitor within the cavity is calculated using the following formula:

[0024] Q=πDLσ(1+χ)

[0025] Where Q is the required amount of corrosion inhibitor, in m³. 3D is the inner diameter of the conveying pipeline, in meters; L is the total length of the conveying pipeline, in meters; σ is the thickness of the membrane, in mm, ranging from 0.1 to 0.2 mm; χ is the allowance for corrosion inhibitor, ranging from 0 to 1.

[0026] In one possible design, the pre-filming speed of the skid-mounted conveying pipeline pre-filming device is calculated using the following formula:

[0027]

[0028] Where V is the pre-filming rate, in m / s; Q is the corrosion inhibitor requirement, in m³ / s. 3 S is the cross-sectional area of ​​the pipeline, measured in meters (m²). 2 τ is the dwell time, measured in seconds (s).

[0029] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0030] In water suction, pipe cleaning, and pre-filming operations, the skid-mounted conveying pipeline pre-filming device can at least complete the pipe cleaning operation. Workers can select and combine different devices according to production needs, and complete the operation at one time through the skid-mounted conveying pipeline pre-filming device, realizing the simultaneous performance of multiple operations, shortening the operation time, and reducing the operation cost. Attached Figure Description

[0031] To more clearly illustrate the technical solutions of the exemplary embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly described below. It should be understood that the following drawings only show some embodiments of the present invention and should not be considered as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort. In the drawings:

[0032] Figure 1 This is a schematic diagram of a skid-mounted pre-filming device located inside a conveying pipeline.

[0033] The attached diagram shows the markings and corresponding component names:

[0034] 100. Pipeline pig with cup; 101. Intermediate cylinder; 102. Front cup; 103. Rear cup; 104. Partition plate; 105. Pressure tap; 200. Sprayer; 201. Base cylinder; 202. Piston; 203. Spray hole; 204. Receiving cavity; 205. Stop ring; 206. Filling hole; 300. Water absorber. Detailed Implementation

[0035] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the embodiments and accompanying drawings. The illustrative embodiments and descriptions of this invention are only for explaining this invention and are not intended to limit this invention.

[0036] In the following description, numerous specific details are set forth in order to provide a thorough understanding of the invention. However, it will be apparent to those skilled in the art that these specific details are not necessary to practice the invention. In other embodiments, well-known structures, circuits, materials, or methods have not been specifically described in order to avoid obscuring the invention.

[0037] Throughout this specification, references to "an embodiment," "an example," or "an example" mean that a particular feature, structure, or characteristic described in connection with that embodiment or example is included in at least one embodiment of the invention. Therefore, the phrases "an embodiment," "an example," "an example," or "an example" appearing in various places throughout the specification do not necessarily refer to the same embodiment or example. Furthermore, specific features, structures, or characteristics can be combined in one or more embodiments or examples in any suitable combination and / or sub-combination. Moreover, those skilled in the art will understand that the illustrations provided herein are for illustrative purposes and are not necessarily drawn to scale. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0038] In the description of this invention, the terms "front", "rear", "left", "right", "up", "down", "vertical", "horizontal", "high", "low", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the scope of protection of this invention.

[0039] Example 1:

[0040] For conveying pipelines, pretreatment is required before use, namely, absorbing moisture, cleaning various impurities, and pre-filming. Existing technology designs a cup-shaped pipeline cleaner 100 for impurity cleaning, while other equipment is used for moisture absorption and pre-filming. Based on this, existing technology requires 2-3 operations on the conveying pipeline, and the longer the pipeline, the greater the cleaning difficulty and the longer the time required.

[0041] Therefore, a skid-mounted pre-filming device for conveying pipelines is provided herein, specifically: such as Figure 1 As shown, a skid-mounted pre-filming device for a conveying pipeline includes a cup-type pigging device 100 and a sprayer 200.

[0042] The cup-shaped pipe cleaner 100 is used to move along the delivery pipeline to clean the delivery pipeline;

[0043] The sprayer 200 is installed on the cup pig 100. The sprayer 200 is used to hold the corrosion inhibitor and spray the corrosion inhibitor through the pressure difference between the upstream and downstream of the cup pig 100.

[0044] Among them, the leather cup pipe cleaner 100 is used to clean the pipes, remove various impurities, and realize the cleaning operation of the conveying pipes.

[0045] The sprayer 200 is connected to the cup pig 100, thus moving alongside the cup pig 100 as it travels along the delivery pipeline, reducing the need for additional drive equipment. The sprayer 200 contains any suitable type of corrosion inhibitor. The cup pig 100 moves within the delivery pipeline using the pressure difference between its upstream and downstream sides; this pressure difference can also be used as the power source for the sprayer 200 to spray the corrosion inhibitor. Furthermore, the cup pig 100 includes two cups. The rearmost cup is used for pre-filming the corrosion inhibitor, ensuring a more uniform application of the inhibitor to the inner wall of the delivery pipeline, forming a dense, strongly adherent, and corrosion-inhibiting film. Correspondingly, the frontmost cup is used to clean the delivery pipeline, preventing impurities from entering the film.

[0046] Based on this, cleaning and pre-filming can be carried out simultaneously.

[0047] Furthermore, regarding water absorption, if the conveying pipeline is relatively dry, water absorption is unnecessary; conversely, if the conveying pipeline contains water, water absorption should be performed before the pre-filming operation. Preferably, a water absorption bag 300 is detachably installed at the front end of the cup pig 100, and water absorption is achieved through the water absorption bag 300 during the movement of the cup pig 100.

[0048] Therefore, in water suction, pipe cleaning and pre-filming operations, the skid-mounted conveying pipeline pre-filming device can at least complete the pipe cleaning operation. Workers can select and combine the devices according to production needs, and complete the operation at one time through the skid-mounted conveying pipeline pre-filming device, so as to realize multiple operations at the same time, shorten the operation time and reduce the operation cost.

[0049] During operation, according to the requirements of the task, such as pre-filming of water-containing pipelines, a water-absorbing bag 300 is installed at the front end of the pig 100, and a corrosion inhibitor is placed inside the sprayer 200. The skid-mounted pipeline pre-filming device is then inserted into the pipeline. Workers create a pressure difference in the pipeline using any suitable existing differential pressure equipment. This pressure difference causes the skid-mounted pipeline pre-filming device to move and operate. The water-absorbing bag 300 is located at the front and performs water absorption first, creating a relatively dry environment for pre-filming. Then, the front cup 102 of the pig 100 performs cleaning, removing various impurities and creating a cleaner environment for pre-filming. Next, the sprayer 200 sprays corrosion inhibitor onto the cleaned pipeline while moving. Finally, the rear cup 103 of the pig 100 evenly distributes the corrosion inhibitor, completing the pre-filming operation.

[0050] Furthermore, if water suction is not required, the water suction pack 300 does not need to be installed at the front end of the pipe cleaner 100. If pre-filming is not required, the sprayer 200 does not need to be filled with corrosion inhibitor.

[0051] It is worth noting that the end of the conveying pipeline can be operated manually. The pressure differential required for the skid-mounted conveying pipeline pre-filming device can be generated and controlled by operators using any suitable existing pressure differential equipment, thereby controlling the moving speed of the skid-mounted conveying pipeline pre-filming device and the corrosion inhibitor spraying speed.

[0052] It is easy to understand that the skid-mounted pre-filming device for conveying pipelines can be used for related operations of carbon dioxide conveying pipelines, as well as for any other suitable conveying pipelines, with a wider range of applications and better practicality.

[0053] In one possible implementation, the cup pig 100 includes an intermediate cylinder 101, a front cup 102, and a rear cup 103;

[0054] The intermediate cylinder 101 has a hollow structure and a partition plate 104 is provided inside the intermediate cylinder 101; the intermediate cylinder 101 has two opposite ends, and correspondingly, the front leather cup 102 and the rear leather cup 103 are respectively provided at the two ends of the intermediate cylinder 101.

[0055] Both the front and rear cups 102 and 103 are used to clean the conveying pipe, or the outer periphery of the front cup 102 presses against the inner wall of the conveying pipe and is used to clean the conveying pipe, while the outer periphery of the rear cup 103 abuts against the inner wall of the conveying pipe and is used for corrosion inhibitor pre-filming.

[0056] Accordingly, the sprayer 200 is disposed on the intermediate cylinder 101 and located between the front cup 102 and the rear cup 103.

[0057] Based on the above design, the intermediate cylinder 101 is constructed as a hollow structure to reduce weight and movement resistance. Simultaneously, a partition plate 104 is installed inside the intermediate cylinder 101, ensuring that the two ends of the pig 100 are not connected when it is placed in the pipeline, thus facilitating the formation of a pressure differential and allowing the pig 100 to move under the influence of this pressure differential. The front and rear pig cups 102 and 103 can be any suitable existing pig cup, offering a wide range of choices and applicability in various situations.

[0058] Furthermore, when pre-filming is required, the rear cup 103 is selected with a lower elastic modulus, preventing it from pressing tightly against the inner wall of the conveying pipeline. This avoids scraping off the corrosion inhibitor and also ensures even application of the inhibitor, improving the quality of the pre-filming process. Conversely, when pre-filming is not required, the rear cup 103 and the front cup 102 are selected as the same model to enable secondary cleaning, further improving the cleaning quality.

[0059] Preferably, such as Figure 1 As shown, the sprayer 200 is mounted on the intermediate cylinder 101 and positioned between the front cup 102 and the rear cup 103. This allows the corrosion inhibitor to be applied more evenly through the rear cup 103, improving the quality of the pre-filming process.

[0060] In one possible implementation, one end of the intermediate cylinder 101 extends beyond the front cup 102, and a water-absorbing bag 300 is detachably mounted on that end. Based on the above design, the water-absorbing bag 300 can be any suitable existing model and can be connected to the intermediate cylinder 101 through any suitable detachable connection method. The function of the water-absorbing bag 300 has already been explained in conjunction with the working principle of the skid-mounted conveying pipeline pre-filming device, and will not be repeated here.

[0061] In one possible implementation, the sprayer 200 includes a base cylinder 201 and a piston 202;

[0062] The base cylinder 201 is sleeved on the intermediate cylinder 101 and has a front end and a rear end. The front end of the base cylinder 201 is close to the rear cup 103 and is connected to the conveying pipe through the pressure hole 105. The rear end of the base cylinder 201 is close to the front cup 102 and is provided with a spray hole 203 facing the inner wall of the conveying pipe.

[0063] The piston 202 is constructed in an annular shape and is slidably disposed on the base cylinder 201. A receiving cavity 204 for containing corrosion inhibitor is formed between the piston 202 and the tail end of the base cylinder 201. The pressure difference between the upstream and downstream of the cup pig 100 is used to drive the piston 202 to slide along the base cylinder 201 so that the corrosion inhibitor is sprayed out from the spray hole 203.

[0064] Correspondingly, the intermediate cylinder 101 is provided with a partition plate 104 located between the first end of the base cylinder 201 and the piston 202, and the intermediate cylinder 101 is provided with a pressure-inducing hole 105 located between the first end of the base cylinder 201 and the partition plate 104. The pressure-inducing hole 105 is used to convey the pressure difference between the upstream and downstream of the cup pig 100 to the base cylinder 201.

[0065] Based on the above design, the base cylinder 201 is at least shaped to fit the inner wall of the conveying pipe, so that the corrosion inhibitor sprayed from the spraying holes 203 can be more evenly distributed on the conveying pipe, thereby improving the quality of the pre-filming operation. The base cylinder 201 is preferably constructed as a cylindrical structure to facilitate the selection of any suitable existing cylindrical component and reduce economic costs.

[0066] Piston 202 moves under the pressure difference between the upstream and downstream of the cup pig 100, thereby pushing the corrosion inhibitor in the receiving cavity 204 to flow and be sprayed out from the spraying hole 203. It is easy to understand that when piston 202 moves towards the tail end of base cylinder 201, the gap between piston 202 and the head end of base cylinder 201 increases, and the pressure difference between the upstream and downstream of cup pig 100 may decrease. However, in order to ensure a constant pressure difference and make piston 202 move at the most uniform speed to ensure uniform spraying of corrosion inhibitor, the operator shall operate the pressure difference device in a timely manner when necessary to keep the pressure difference between the upstream and downstream of cup pig 100 stable.

[0067] The function of the partition plate 104 has already been explained in conjunction with the structure of the cup pig 100, and will not be repeated here. As for the intermediate cylinder 101, it is connected by setting the pressure inlet 105 to ensure that the pressure difference is delivered to the piston 202, thereby driving the piston 202 to move.

[0068] Optionally, the inner wall surface of the base cylinder 201 is provided with two spaced-apart stop rings 205, and the piston 202 is located between the two stop rings 205;

[0069] The base cylinder 201 is also provided with a filling hole 206 located between two stop rings 205 and a sealing plug detachably provided on the filling hole 206, and the filling hole 206 is located at the upper part of the base cylinder 201.

[0070] Based on the above design, two stop rings 205 cooperate to limit the movement range of the piston 202. When the piston 202 approaches the first end of the base cylinder 201, it ensures that the piston 202 will not exceed the pressure inlet 105, preventing the pressure inlet 105 from communicating with the receiving cavity 204. When the piston 202 approaches the last end of the base cylinder 201, it ensures that the corrosion inhibitor is evenly sprayed through the spraying orifice 203, especially when... Figure 1 As shown, the tail end of the base cylinder 201 is constructed as an outwardly convex ring-shaped structure.

[0071] The filling hole 206 facilitates the filling of corrosion inhibitor into the receiving cavity 204, enabling repeated use. It is easy to understand that any suitable existing type of sealant can be selected. When the filling hole 206 is located at the lower part of the base cylinder 201, corrosion inhibitor leakage may occur; therefore, ensure that the filling hole 206 is located at the upper part of the base cylinder 201.

[0072] Optionally, a plurality of spray holes 203 are provided and evenly distributed along the circumference of the base cylinder 201 at the tail end of the base cylinder 201, and the central angle of the spray range of the spray holes 203 is 55°-60°. Based on the above design scheme, in order to ensure that the annular inner wall surface of the conveying channel aligned with the spray holes 203 is uniformly sprayed with corrosion inhibitor, no less than 10 spray holes 203 should be provided, and the included angle between adjacent spray holes 203 should not be greater than 36°. For example, there are 12 spray holes 203, and the included angle between two adjacent spray holes 203 is 30°.

[0073] Meanwhile, the central angle of the spray range of the spray hole 203 is 55°-60°, that is, the spray angle of the spray hole 203 is 55°-60°. In conjunction with the adjacent spray holes 203, the corrosion inhibitor is fully covered and uniformly sprayed.

[0074] Optionally, the distance between the spraying hole 203 and the inner wall of the conveying pipe is 1-3 cm. Correspondingly, the tail end of the base cylinder 201 is constructed as a convex annular structure, so that the distance between the spraying hole 203 and the inner wall of the conveying pipe is 1-3 cm. Based on the above design scheme, reducing the distance between the spraying hole 203 and the inner wall of the conveying pipe shortens the spraying distance of the corrosion inhibitor, thereby reducing the pressure difference requirement and helping to achieve full coverage and uniform spraying of the corrosion inhibitor.

[0075] Furthermore, if the inner diameter of the conveying pipe is much larger than the outer diameter of the base cylinder 201, such as the inner diameter of the conveying pipe being 5cm or more larger than the outer diameter of the base cylinder 201, then in order to achieve a distance of 1-3cm between the spray hole 203 and the inner wall of the conveying pipe, the tail end of the base cylinder 201 is constructed as an outwardly convex annular platform structure, eliminating the need to adjust the entire base cylinder 201.

[0076] Optionally, a plurality of pressure-injecting holes 105 are provided and evenly distributed along the circumference of the second section, and the distance between the pressure-injecting holes 105 and the first end of the base cylinder 201 is 1.5-3cm. Based on the above design scheme, the pressure-injecting holes 105 are evenly arranged to ensure that the piston 202 is subjected to uniform pressure, to ensure the synchronicity of the movement of the piston 202, and to achieve full coverage and uniform spraying of the corrosion inhibitor.

[0077] Example 2:

[0078] This embodiment, based on the skid-mounted conveying pipeline pre-filming device described in Embodiment 1, provides a quantitative explanation of the corrosion inhibitor dosage in the skid-mounted conveying pipeline pre-filming device. Specifically:

[0079] In one possible implementation, the capacity of the corrosion inhibitor within the cavity 204 is calculated using the following formula:

[0080] Q=πDLσ(1+χ)

[0081] Where Q is the required amount of corrosion inhibitor, in m³. 3 D is the inner diameter of the conveying pipeline, in meters; L is the total length of the conveying pipeline, in meters; σ is the thickness of the membrane, in mm, ranging from 0.1 to 0.2 mm; χ is the allowance for corrosion inhibitor, ranging from 0 to 1.

[0082] Based on the above design scheme, the inner diameter D and total length L of the conveying pipeline are obtained by measurement or other suitable methods. The membrane thickness σ and corrosion inhibitor allowance χ are selected according to the actual construction conditions. Thus, the values ​​of each parameter in the calculation formula are determined, and the required amount of corrosion inhibitor Q is calculated according to the formula.

[0083] Based on the calculation results, the staff prepares the corresponding amount of corrosion inhibitor. During operation, the corrosion inhibitor is then introduced into the receiving cavity 204 through the filling hole 206.

[0084] In one possible implementation, the pre-filming speed of the skid-mounted conveying pipeline pre-filming device is calculated using the following formula:

[0085]

[0086] Where V is the pre-filming rate, in m / s; Q is the corrosion inhibitor requirement, in m³ / s. 3 S is the cross-sectional area of ​​the pipeline, measured in meters (m²). 2 τ is the dwell time, measured in seconds (s).

[0087] Based on the above design scheme, in addition to the required amount of corrosion inhibitor, to achieve full coverage and uniform spraying of the corrosion inhibitor, it is also necessary to control the pre-filming speed, which is the moving speed of the skid-mounted conveying pipeline pre-filming device. The required amount of corrosion inhibitor Q has been calculated, and the cross-sectional area S of the conveying pipeline is obtained through measurement or other suitable methods. The residence time τ can be obtained through trial spraying, and an empirical time range can be obtained after multiple sprayings for selection.

[0088] Therefore, the values ​​of each parameter in the calculation formula are determined, and the pre-filming speed V is obtained by calculating according to the formula. The staff adjusts the parameters of the differential pressure equipment according to the calculation results so that the pre-filming speed of the skid-mounted conveying pipeline pre-filming device conforms to the calculation results.

[0089] In summary, this embodiment further refines the use of the skid-mounted conveying pipeline pre-filming device through quantitative calculation, making the skid-mounted conveying pipeline pre-filming device work more accurately, reducing reliance on manual experience, helping to achieve full coverage and uniform spraying of corrosion inhibitors, and greatly improving the quality of pre-filming operations.

[0090] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A skid-mounted pre-filming device for conveying pipelines, characterized in that, Includes a pipe cleaner (100) and a sprayer (200); A cup-shaped pipe cleaner (100) is used to move along the delivery pipeline to clean the delivery pipeline; The sprayer (200) is installed on the cup pig (100). The sprayer (200) is used to hold the corrosion inhibitor and spray the corrosion inhibitor through the pressure difference between the upstream and downstream of the cup pig (100).

2. The skid-mounted pre-filming device for conveying pipelines according to claim 1, characterized in that, The cup-shaped pipe cleaner (100) includes an intermediate cylinder (101), a front cup (102), and a rear cup (103); The intermediate cylinder (101) is hollow and a partition plate (104) is provided inside the intermediate cylinder (101); the intermediate cylinder (101) has two opposite ends, and correspondingly, the front cup (102) and the rear cup (103) are respectively provided at the two ends of the intermediate cylinder (101); Both the front cup (102) and the rear cup (103) are used to clean the conveying pipe, or the outer periphery of the front cup (102) presses against the inner wall of the conveying pipe and is used to clean the conveying pipe, while the outer periphery of the rear cup (103) abuts against the inner wall of the conveying pipe and is used for corrosion inhibitor pre-filming. Accordingly, the sprayer (200) is mounted on the intermediate cylinder (101) and positioned between the front cup (102) and the rear cup (103).

3. The skid-mounted pre-filming device for conveying pipelines according to claim 2, characterized in that, One end of the intermediate tube (101) extends to the outside of the front cup (102), and a water-absorbing bag (300) is detachably provided on that end.

4. The skid-mounted pre-filming device for conveying pipelines according to any one of claims 1-3, characterized in that, The sprayer (200) includes a base (201) and a piston (202); The base cylinder (201) is sleeved on the intermediate cylinder (101) and has a head end and a tail end. The head end of the base cylinder (201) is close to the rear cup (103) and is connected to the conveying pipe through the pressure hole (105). The tail end of the base cylinder (201) is close to the front cup (102) and is provided with a spray hole (203) facing the inner wall of the conveying pipe. The piston (202) is constructed in an annular shape and is slidably disposed on the base cylinder (201). A receiving cavity (204) for containing corrosion inhibitor is formed between the piston (202) and the tail end of the base cylinder (201). The pressure difference between the upstream and downstream of the cup pig (100) is used to drive the piston (202) to slide along the base cylinder (201) so that the corrosion inhibitor is sprayed out from the spray hole (203). Correspondingly, the intermediate cylinder (101) is provided with a partition plate (104) located between the first end of the base cylinder (201) and the piston (202), and the intermediate cylinder (101) is provided with a pressure-inducing hole (105) located between the first end of the base cylinder (201) and the partition plate (104). The pressure-inducing hole (105) is used to convey the pressure difference between the upstream and downstream of the cup pig (100) to the base cylinder (201).

5. The skid-mounted pre-filming device for conveying pipelines according to claim 4, characterized in that, The inner wall of the base cylinder (201) is provided with two spaced-apart stop rings (205), and the piston (202) is located between the two stop rings (205); The base cylinder (201) is also provided with a filling hole (206) located between two stop rings (205) and a sealing plug detachably provided on the filling hole (206), and the filling hole (206) is located at the upper part of the base cylinder (201).

6. The skid-mounted pre-filming device for conveying pipelines according to claim 5, characterized in that, The spray holes (203) are provided in a number and are evenly distributed around the tail end of the base cylinder (201) along the circumference of the base cylinder (201), and the central angle of the spray range of the spray holes (203) is 55°-60°.

7. The skid-mounted pre-filming device for conveying pipelines according to claim 6, characterized in that, The distance between the spraying hole (203) and the inner wall of the conveying pipe is 1-3cm. Correspondingly, the tail end of the base cylinder (201) is constructed as an outwardly convex annular structure so that the distance between the spraying hole (203) and the inner wall of the conveying pipe is 1-3cm.

8. The skid-mounted pre-filming device for conveying pipelines according to claim 7, characterized in that, Several pressure-inducing holes (105) are provided and are evenly distributed on the second section along the circumference of the second section, and the distance between the pressure-inducing holes (105) and the first end of the base cylinder (201) is 1.5-3cm.

9. The skid-mounted pre-filming device for conveying pipelines according to any one of claims 5-8, characterized in that, The capacity of the corrosion inhibitor in the cavity (204) is calculated using the following formula: Q=πDLσ(1+χ) Where Q is the required amount of corrosion inhibitor, in m³. 3 D is the inner diameter of the conveying pipeline, in meters; L is the total length of the conveying pipeline, in meters; σ is the thickness of the membrane, in mm, ranging from 0.1 to 0.2 mm; χ is the allowance for corrosion inhibitor, ranging from 0 to 1.

10. The skid-mounted pre-filming device for conveying pipelines according to claim 9, characterized in that, The pre-filming speed of the skid-mounted conveying pipeline pre-filming device is calculated using the following formula: Where V is the pre-filming rate, in m / s; Q is the corrosion inhibitor requirement, in m³ / s. 3 S is the cross-sectional area of ​​the pipeline, measured in meters (m²). 2 τ is the dwell time, measured in seconds (s).

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