Soluble stratified pipeline pig

Abstract

The present invention provides a soluble layered pipeline cleaning device, comprising a cleaning device supporting layer and a skin layer, wherein the supporting layer is covered by the skin layer, the supporting layer is arranged inside the skin layer, the supporting layer and the skin layer are both made of materials soluble in a medium transported by a pipeline to be cleaned, the supporting layer extends radially inside the skin layer, the thickness of the skin layer is less than the thickness of the supporting layer, and the dissolution rate of the skin layer is slower than the dissolution rate of the supporting layer. The present invention has the advantages of high efficiency, environmental protection and energy saving.

Description

Technical Field

[0001] The invention belongs to the technical field of pipeline cleaning of petrochemical transmission pipelines, and in particular relates to a soluble pipeline cleaning device. Background Art

[0002] In long-distance pipelines such as petrochemicals, the pipelines must be cleaned regularly to remove various residues in the pipelines to ensure smooth flow of the pipelines, thereby preventing the accumulation of debris in the pipeline transportation medium from causing changes in the pipe diameter and affecting the transportation efficiency.

[0003] At present, ball-sending and receiving devices are widely used in various medium conveying pipelines. They are generally installed at both ends of the main pipeline to launch and receive pipe cleaners, and to pass balls to sweep the lines before the pipeline is put into operation, and to remove wax, oil, and scale after it is put into operation. To send and recover cleaning balls using ball-sending and receiving cylinders, it is necessary to set up ball-passing monitoring points or add positioning devices to the pipe cleaners to monitor the operation of the cleaning balls, and usually a detailed plan needs to be made for the pipeline. The steps of sending and recovering cleaning balls are also quite cumbersome, and once the cleaning ball is stuck in the pipeline, it is usually necessary to apply reverse pressure or stop the pipeline transportation and cut the pipeline to remove the pipe cleaner. The pipe cleaners currently used are all made of metal, rubber or foam materials, and the cleaning balls need to be recovered; the recovery process of the cleaning balls is also very cumbersome, resulting in difficulty and low efficiency in pipeline cleaning. Summary of the invention

[0004] The object of the present invention is to provide a soluble layered pipeline cleaning device, comprising a cleaning device support layer and a skin layer, wherein the support layer is covered by the skin layer, the support layer is arranged inside the skin layer, the support layer and the skin layer are both made of materials that are soluble in a medium transported by a pipeline to be cleaned, the support layer extends radially, the thickness of the skin layer is smaller than the thickness of the support layer, and the dissolution rate of the skin layer is slower than the dissolution rate of the support layer.

[0005] As a further improvement of an embodiment of the present invention, the dissolution rate of the material of the support layer is more than twice the dissolution rate of the epidermis layer.

[0006] As a further improvement of an embodiment of the present invention, the skin layer also includes added wear-resistant particles.

[0007] As a further improvement of an embodiment of the present invention, the wear-resistant particles account for more than 5% of the volume of the epidermis.

[0008] As a further improvement of an embodiment of the present invention, the support layer is a plurality of support frames uniformly arranged along the radial direction, and a hollow internal space is formed between adjacent support frames.

[0009] As a further improvement of an embodiment of the present invention, the thickness of the support layer is less than half of the thickness of the support frame.

[0010] As a further improvement of the embodiment of the present invention, the cross section of the support layer is pentagonal or hexagonal.

[0011] As a further improvement of the embodiment of the present invention, the epidermis layer or the support layer is further provided with grooves.

[0012] As a further improvement of an embodiment of the present invention, the groove is embedded in the epidermis layer or the support layer and arranged circumferentially along the epidermis layer or the support layer, and the groove divides the epidermis layer or the support layer into a plurality of grid-like partitions.

[0013] As a further improvement of the embodiment of the present invention, the groove is embedded in the epidermis layer or the support layer to a depth not less than 20 percent of the thickness of the epidermis layer or the support layer.

[0014] As a further improvement of the embodiment of the present invention, the support layer is made of a water-soluble modified resin material, and the skin layer is made of a water-soluble non-ionic cellulose ether material.

[0015] The advantages and positive effects of the present invention are:

[0016] (1) It can clean the accumulated liquid in the pipeline in a very short time, achieve cleaning when the pipeline is in normal use, and improve production efficiency.

[0017] (2) The dissolution rate of the epidermis is slower than that of the support layer, which can ensure that the epidermis can maintain the integrity of the entire pig according to the preset conditions during use, thereby ensuring the working time of the pig. After the epidermis is worn and broken after work, the support layer uses a material with a faster dissolution rate, which can dissolve and break more quickly, thus shortening the pipeline maintenance time.

[0018] (3) Avoid blockage of downstream pipelines and equipment by the pipe cleaner.

[0019] (4) The support structure of the support layer can dissolve faster after the cleaning work is completed. At the same time, it can also enhance the deformation ability of the pipe cleaner itself, so that it can fit more closely with the inner wall of the pipeline. At the same time, it can be broken when there is a blockage inside the pipeline, so as to avoid the pipe cleaner getting stuck in the pipeline and causing blockage to the pipeline, thereby achieving a better cleaning effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0021] Figure 1 It is a schematic cross-sectional view of the spherical soluble pipeline pig of the present invention;

[0022] Figure 2 It is a schematic cross-sectional view of the spherical soluble pipeline pig having a hollow inner space of the present invention;

[0023] In the figure, there is epidermis layer 1 and support layer 2. DETAILED DESCRIPTION

[0024] The present invention will be described in detail below in conjunction with the specific embodiments shown in the accompanying drawings. However, these embodiments do not limit the present invention, and any structural, methodological, or functional changes made by a person skilled in the art based on these embodiments are all within the scope of protection of the present invention.

[0025] In various drawings of the present application, for the convenience of illustration, some sizes of structures or parts are exaggerated relative to other structures or parts, and thus, are only used to illustrate the basic structure of the subject matter of the present application.

[0026] In addition, terms such as "upper", "above", "lower", "below", etc. used herein to indicate spatial relative positions are used for the purpose of convenience to describe the relationship of one unit or feature relative to another unit or feature as shown in the drawings. Terms of spatial relative position may be intended to include different orientations of the device in use or operation other than the orientation shown in the drawings. For example, if the device in the figure is turned over, the unit described as being "below" or "beneath" other units or features will be located "above" the other units or features. Therefore, the exemplary term "below" can encompass both the above and below orientations. The device may be oriented in other ways (rotated 90 degrees or other orientations), and the spatially related descriptors used herein shall be interpreted accordingly.

[0027] like Figure 1 As shown, the present invention relates to a soluble layered pipeline cleaning device, comprising a cleaning device support layer and a skin layer, wherein the support layer is covered by the skin layer, the support layer is arranged inside the skin layer, the support layer and the skin layer are both made of materials that are soluble in the medium transported by the pipeline to be cleaned, the thickness of the skin layer is smaller than the thickness of the support layer, and the material used in the skin layer has a slower dissolution rate than the material used in the support layer.

[0028] Preferably, the dissolution rate of the material used in the support layer is more than twice the dissolution rate of the material used in the epidermis layer.

[0029] Preferably, the material used for the support layer is a water-soluble modified resin. The material used for the epidermis layer is a water-soluble non-ionic soluble cellulose ether material. For example, the epidermis layer is a water-soluble (or soluble) material similar to nylon, plastic or wear-resistant polyurethane that can be dissolved, and the material includes a water-soluble modified resin, modified water-soluble polyurethane, and modified polyvinyl alcohol. In order to improve the wear resistance of the epidermis layer, wear-resistant particles such as glass beads, ceramic micro beads, lead beads, and carbon beads can be added to increase the wear resistance of the epidermis layer, and the added proportion is more than 5% of the volume of the epidermis layer.

[0030] Preferably, the material used for the support layer is non-ionic soluble cellulose ether, such as cellulose fiber, hydroxyethyl cellulose, modified water-soluble polyurethane, modified water-soluble resin, modified polyvinyl alcohol, water-soluble modified EVA, modified polyester sponge, etc. The support layer is any one of spherical, cylindrical, bullet-shaped or candied haws-like shapes.

[0031] Preferably, the support layer is a plurality of support frames connected to each other. The plurality of support frames are hollow inside, forming an internal pore shape similar to a honeycomb. The support layers are connected to each other to form the internal structure of the pipe cleaner, and the bottom of the support frame can be set to be hollow, forming a hollow layer inside the support layer inside the pipe cleaner.

[0032] Preferably, the bottoms of the support frames are connected to each other. The bottoms of the support frames are connected to each other through an inner skin layer, and the inner skin layer is made of a material that is soluble in the medium transported by the pipeline to be cleaned.

[0033] Preferably, the epidermis layer is connected to the support layer by injection molding on the outer surface of the support layer. The production process in which the two parts are composed of two materials: first, cellulose is injected into a 1 / 2 hemisphere of the support layer or a support layer split part similar to a candied haws or other shapes, and the joints of the two parts are bonded together by riveting and overlapping to form an integral support layer. Then the support layer is installed in the mold, and then the outer epidermis layer is injection molded on it. It can also be divided into two steps. The support layer is first 3D printed, which can be printed and formed in one time; then the outer surface of the support layer is printed and formed in one time by 3D printing.

[0034] Preferably, the material used for the skin layer has better wear resistance than the material used for the support layer.

[0035] Preferably, the pipe cleaner can be in a variety of different shapes, such as cylindrical, spherical, bullet-shaped, dumbbell-shaped, etc.

[0036] The use of the soluble stratified pipeline pig in the pipeline cleaning process includes the following specific steps: the soluble stratified pipeline pig installation step, putting the soluble stratified pipeline pig into a ball valve or a ball barrel, and sending it. The soluble stratified pipeline pig enters the pipeline through the ball valve or the ball barrel connected to the pipeline; the opening and closing of several delivery valves, and closing the delivery pipeline after the soluble stratified pipeline pig enters the pipeline; the pressure pushing step, opening the pipeline, and the pipeline generates pressure in the pipeline due to the entry of the pressure source to push the soluble stratified pipeline pig forward; closing the pipeline in the forward direction of the gas at the designated position of the pipeline, opening the recovery pipeline connected to the pipeline, and after the pressure in the pipeline pushes the soluble stratified pipeline pig into the recovery tank, closing the recovery pipeline, and opening the pipeline in the forward direction of the gas.

[0037] It is sent out by the pipeline ball barrel, which is usually connected to the pipeline like a tee or a cross. After it is sent out, the opening and closing of several valves reverse the flow direction of the airflow and pressurize the pipeline at the same time, thereby pushing the soluble stratified pipeline pig forward. When there are two soluble stratified pipeline pigs, the front soluble stratified pipeline pig is used to bear force and clean the pipeline, pulling the rear soluble stratified pipeline pig. The friction between the front soluble stratified pipeline pig and the pipeline is greater than that of the rear soluble stratified pipeline pig. While the front soluble stratified pipeline pig moves forward, it rotates by friction with the pipe wall to achieve the purpose of removing the scale in the pipeline. The distance between the front and rear soluble stratified pipeline pigs determines the length of the plugging section. If only the cleaning function needs to be realized, a ball collecting barrel is set at the designated position of the pipeline. The recovery pipeline can usually be connected to a tee of the pipeline, so that the soluble stratified pipeline pig is pushed into the waste liquid recovery device by pressure to complete the cleaning. The soluble stratified pipeline pig is dissolved or degraded in the waste liquid recovery device, and the cleaning effect can be determined based on the amount of recovered liquid collected by the waste liquid recovery device, as well as whether it needs to be cleaned again.

[0038] To achieve the plugging function, the magnetic device can be installed in advance in the plugging section that needs to be plugged. The pipeline pressure pushes the soluble layered pipeline pig to the designated location and contacts the magnetic device pre-installed on the pipeline. The magnetic device controls the expansion of the outer diameter of the soluble layered pipeline pig so that it is tightly combined with the pipeline, thereby opening the plugging function. The soluble layered pipeline pig stops moving forward. Then the pipeline is depressurized, the pipeline is cold-cut to a section, and the hot work is performed. After the hot work is completed, the magnetic device is transposed to shrink the outer diameter of the soluble layered pipeline pig and release the plugging function. Then the pipeline is pressurized to continue to push the pig isolator forward until it falls into the ball collecting bucket at the end of the pipeline. Pipe cleaning and hot work plugging are completed simultaneously.

[0039] Advantages: It saves the work of replacing combustible gas with nitrogen before starting the fire and replacing air with nitrogen before production, which improves safety, saves costs, shortens operation time and improves efficiency.

[0040] Although the specific embodiments of the present invention are described above, it should be understood by those skilled in the art that these are only examples, and the protection scope of the present invention is defined by the appended claims. Those skilled in the art may make various changes or modifications to these embodiments without departing from the principles and essence of the present invention, but these changes and modifications all fall within the protection scope of the present invention.

[0041] It should be understood that although this specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each implementation mode may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

[0042] The series of detailed descriptions listed above are only specific descriptions of feasible implementation methods of the present invention. They are not intended to limit the scope of protection of the present invention. Any equivalent implementation methods or changes that do not deviate from the technical spirit of the present invention should be included in the scope of protection of the present invention.

Claims

1. A soluble layered pipeline cleaning device, comprising a cleaning device support layer and a skin layer, wherein the support layer is covered by the skin layer, the support layer is arranged inside the skin layer, and the support layer and the skin layer are both made of materials that are soluble in a medium transported by a pipeline to be cleaned, characterized in that: The support layer extends radially inside the epidermis layer, the thickness of the epidermis layer is less than the thickness of the support layer, the dissolution rate of the epidermis layer is slower than the dissolution rate of the support layer, the epidermis layer also includes added wear-resistant particles, the epidermis layer or the support layer is also provided with grooves, the grooves are embedded in the epidermis layer or the support layer and are arranged circumferentially along the epidermis layer or the support layer, and the grooves divide the epidermis layer or the support layer into multiple grid-like partitions.

2. The soluble layered pipeline pig according to claim 1, characterized in that: The dissolution rate of the support layer is more than twice that of the epidermis layer.

3. The soluble layered pipeline pig according to claim 1, characterized in that: The wear-resistant particles account for more than 5% of the volume of the epidermis.

4. The soluble layered pipeline pig according to claim 1, characterized in that: The support layer is a plurality of support frames uniformly arranged along the radial direction, and a hollow internal space is formed between adjacent support frames.

5. The soluble layered pipeline pig according to claim 4, characterized in that: The cross section of the support layer is pentagonal or hexagonal.

6. The soluble layered pipeline pig according to claim 1, characterized in that: The support layer is made of a water-soluble modified resin material, and the surface layer is made of a water-soluble non-ionic cellulose ether material.

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