A jacketed multi-way plunger device and its application

Abstract

This invention provides a jacketed multi-way plunger device and its application, belonging to the field of pipeline engineering design. The jacketed multi-way plunger device includes a first plunger valve and a second plunger valve; a first pipeline is vertically connected to the end of the first plunger valve, and a second pipeline is obliquely connected to the first plunger valve; a third pipeline is vertically connected to the end of the second plunger valve, and the first pipeline and the second plunger valve are obliquely connected. This invention integrates the first and second plunger valves into one unit through the pipeline arrangement, achieving both pipeline shut-off and flow functions, while simultaneously enabling continuous material feeding.

Description

Technical Field

[0001] This invention belongs to the field of pipeline engineering design, specifically relating to a jacketed multi-way plunger device and its application. Background Technology

[0002] In the preparation of poly(butylene terephthalate) succinate (PDST), a plunger pump is required to inject the catalyst and ensure thorough mixing with the esterified product to prevent localized catalyst accumulation that could negatively impact catalytic performance. Existing methods for catalyst slurry injection employ multiple plunger valves in a tubing system, such as... Figure 1 As shown, the two plunger valves are connected by a pipeline. During use, the two plunger valves inject the catalyst and ester respectively. For some locations where pipeline layout is difficult, the installation of this structure is difficult. At the same time, the actuator is prone to collision during on-site installation. Even if the installation is completed, since the existing plunger valves all use standard plunger valve flow channels, the flow effect of PBST catalyst slurry is easily poor, and catalyst solids deposit and block the feed pipeline, resulting in unsatisfactory performance. Summary of the Invention

[0003] The purpose of this invention is to solve the problems existing in the prior art and provide a jacketed multi-way plunger device and its application, so as to realize the functions of pipeline cutting off, flow, and continuous material feeding.

[0004] One of the objectives of this invention is to provide a jacketed multi-way plunger device.

[0005] The second objective of this invention is to provide an application of a jacketed multi-channel plunger device in the preparation of PDST.

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

[0007] A first aspect of the present invention provides a jacketed multi-way plunger device, comprising a first plunger valve and a second plunger valve;

[0008] The first plunger valve is vertically connected to a first pipeline at its end, and a second pipeline is obliquely connected to the first plunger valve.

[0009] The end of the second plunger valve is vertically connected to a third pipeline, and the first pipeline is obliquely connected to the second plunger valve.

[0010] This invention integrates the first plunger valve and the second plunger valve into one unit through the arrangement of the pipeline, thereby realizing the functions of pipeline cut-off and flow, and at the same time realizing the continuous feeding of materials.

[0011] A further improvement of the present invention is that:

[0012] The angle between the central axis of the first plunger valve and the central axis of the second pipeline is 20-40°.

[0013] A further improvement of the present invention is that:

[0014] The angle between the central axis of the second plunger valve and the central axis of the first pipeline is 30-60°.

[0015] A further improvement of the present invention is that:

[0016] One end of the first pipeline is the first material inlet, and the first plunger valve is perpendicularly connected to the side wall of the first pipeline near the first material inlet.

[0017] The other end of the first pipeline is a beveled cut, which is used to connect to the second plunger valve at an angle.

[0018] A further improvement of the present invention is that:

[0019] One end of the second pipeline is the second material inlet, and the other end is a beveled cut for oblique connection with the first plunger valve.

[0020] A further improvement of the present invention is that:

[0021] The second pipeline has a necking structure at one end located at the second material inlet, which can control the flow rate of the material (catalyst) entering through the second material inlet and prevent local sedimentation and blockage of the pipeline.

[0022] A further improvement of the present invention is that:

[0023] The second pipeline is also provided with a dispersion component inside the necking structure, which is used to perform secondary dispersion on the material (catalyst) entering the second pipeline through the second material inlet, reduce the possibility of local agglomeration, and enable it to enter the polymer melt uniformly.

[0024] The dispersion component includes a groove or protrusion structure disposed on the inner wall of the second pipeline. The groove or protrusion structure is disposed along the axial direction on the inner wall of the second pipeline, and multiple grooves or protrusion structures are uniformly disposed along the circumference.

[0025] A further improvement of the present invention is that:

[0026] One end of the third pipeline is the third material inlet, and the other end is the mixed material outlet. The side wall of the third pipeline is perpendicularly connected to the second plunger valve.

[0027] A further improvement of the present invention is that:

[0028] The jacketed multi-way plunger device is externally equipped with a jacket for introducing hot oil to heat the polymer melt inside the device. The heating temperature is required to be 250-270℃, which can ensure that the material can be continuously fed and avoid clogging the pipeline.

[0029] The jacket is provided with at least one partition to divide the interior of the jacket cavity into at least two heat medium cavities, and each heat medium cavity has a heat medium inlet and a heat medium outlet on the corresponding jacket side wall.

[0030] A second aspect of the present invention provides the application of a jacketed multi-channel plunger device in the preparation of phthalic acid-butanediol ester.

[0031] Compared with the prior art, the beneficial effects of the present invention are:

[0032] This invention integrates the first plunger valve and the second plunger valve into one unit through the arrangement of the pipeline, thereby realizing the functions of pipeline cut-off and flow, and at the same time realizing the continuous feeding of materials.

[0033] In this invention, by designing the second material inlet of the second pipeline as a constricted structure, the flow rate of the material (catalyst) entering through the second material inlet can be controlled, preventing local sedimentation and blockage of the pipeline.

[0034] In this invention, a dispersion component is provided inside the second pipeline to perform secondary dispersion on the material (catalyst) entering the second pipeline through the second material inlet, thereby reducing the possibility of local agglomeration and enabling it to enter the polymer melt uniformly.

[0035] This invention provides a jacket outside the entire jacketed multi-channel plunger device for introducing hot oil to heat the polymer melt inside the device. The heating temperature requirement is 250-270℃, which can ensure continuous material feeding and avoid pipe blockage.

[0036] This invention optimizes piping space and, compared with existing technologies, avoids the need to purchase multiple valves and pipe flanges, thus reducing procurement costs. Attached Figure Description

[0037] Figure 1 This is a schematic diagram of the multiple plunger valve tubing used in existing PBST devices;

[0038] Figure 2 This is a schematic diagram of the structure of the jacketed multi-path plunger device of the present invention;

[0039] Figure 3 This is a schematic diagram of the first plunger valve.

[0040] In the picture,

[0041] 1. First plunger valve; 101. First valve body; 102. Packing; 103. Packing sleeve; 104. Packing gland; 105. First connecting part; 106. First connecting port; 107. First valve stem; 108. First plunger; 109. First valve stem nut; 110. First handwheel; 111. First support plate; 112. First support rod nut; 113. Support rod.

[0042] 2. Second plunger valve,

[0043] 3. First pipeline, 301, First material inlet.

[0044] 4. Second pipeline, 401, Second material inlet, 402, Dispersion component.

[0045] 5. Third pipeline, 501, Third material inlet, 502, Mixture outlet.

[0046] 6. Jacket. Detailed Implementation

[0047] The present invention will now be described in further detail with reference to the accompanying drawings:

[0048]

Example 1

[0049] This embodiment provides a jacketed multi-way plunger device, such as Figure 2 As shown, it includes a first plunger valve 1 and a second plunger valve 2;

[0050] The first plunger valve 1 is vertically connected to the end of the first pipe 3, and the first plunger valve 1 is inclinedly connected to the second pipe 4.

[0051] The end of the second plunger valve 2 is vertically connected to the third pipe 5, and the first pipe 3 is obliquely connected to the second plunger valve 2.

[0052] Furthermore, the central axis of the first plunger valve 1 is perpendicular to the central axis of the first pipeline 3, and the central axis of the second plunger valve 2 is perpendicular to the central axis of the third pipeline 5.

[0053] Furthermore, the angle between the central axis of the first plunger valve 1 and the central axis of the second pipeline 4 is 20-40° to ensure that the catalyst can smoothly enter the first pipeline 3 from the second pipeline 4 and the first plunger valve 1 and be fully and effectively mixed with the material in the first pipeline 3.

[0054] Furthermore, the angle between the central axis of the second plunger valve 2 and the central axis of the first pipeline 3 is 30-60° to ensure that the material entering from the first pipeline 3 and the material entering from the third pipeline 5 can be fully and effectively mixed.

[0055] It should be noted that the interiors of the first plunger valve 1 and the second plunger valve 2, as well as the material contact components, are all polished in this invention. The polishing requirement is Ra0.4. The purpose is to ensure that the high-viscosity polymer melt flows smoothly inside the device and reduce flow resistance.

[0056] In this embodiment of the invention, the first plunger valve 1 and the second plunger valve 2 are integrated into one unit through the arrangement of the pipeline, so as to realize the functions of pipeline cut-off and flow, and at the same time realize the continuous feeding of materials.

[0057] This invention optimizes piping space and, compared with existing technologies, avoids the need to purchase multiple valves and pipe flanges, thus reducing procurement costs.

[0058]

Example 2

[0059] like Figure 3 As shown, the first plunger valve 1 includes a first valve body assembly and a first valve stem assembly.

[0060] The first valve body assembly includes a first valve body 101, which is a cavity structure with openings at both ends. An annular groove is provided on the inner side of one end of the first valve body 101, specifically formed by extending inward from the end of the first valve body 101. The annular groove is filled with packing material 102, which is fixed at the end of the first valve body 101 by a packing sleeve 103 and a packing cap 104 in sequence. The packing material 102 is made of 304 stainless steel and polytetrafluoroethylene (PTFE) and serves as a seal. The other end of the first valve body 101 is connected to the first pipeline 3.

[0061] The first valve body 101 has an annular groove at one end, and four outwardly protruding first connecting parts 105 are evenly arranged along the circumference at one end. The first connecting parts 105 are provided with threaded holes.

[0062] The first valve body 101 has a first connection port 106 on one side wall near the first pipeline. The first connection port 106 is used to connect to the second pipeline 4. The size of the first connection port 106 is the same as the size of the connection point of the second pipeline 4.

[0063] The first valve stem assembly includes a first valve stem 107, with a first plunger 108 fixed to one end of the first valve stem 107. The first plunger 108 is disposed within the cavity of the first valve body 101 and is capable of moving along the axial direction within the cavity.

[0064] A first valve stem nut 109 is fitted onto the first valve stem 107, and a first handwheel 110 is fitted onto the first valve stem nut 109. A first support plate 111 is fitted onto the first valve stem nut 109 near the inner side of the first handwheel 110. Four first protruding connecting parts are evenly arranged circumferentially on the outer wall of the first support plate 111. Each first protruding connecting part has a threaded through hole. The threaded hole on the first connecting part 105 and the threaded through hole on the first protruding connecting part are positioned to match. A support rod 113 is connected between the threaded hole on the first connecting part 105 and the threaded through hole on the first protruding connecting part. Specifically, the two ends of the support rod 113 are respectively connected to the threaded hole on the first connecting part 105 and the threaded through hole on the first protruding connecting part, and are fixed by the first support rod nut 112. When the first handwheel 110 is turned, the first handwheel 110 drives the first valve stem nut 109 to rotate, causing the first valve stem 107 to move up and down, which in turn drives the first plunger 108 to move along the axial direction within the cavity structure of the first valve body 101.

[0065] An anti-rotation pointer is provided between the two support rods 113. The anti-rotation pointer is used to prevent the first valve rod 107 from rotating automatically when the first handwheel 110 is turned, thus affecting the switch. Another function is to indicate the opening degree of the first plunger valve 1.

[0066] The central axes of the first valve body 101, the first plunger 108, and the first valve stem 107 coincide, and the diameter of the first plunger 108 is adapted to the inner diameter of the first valve body 101.

[0067] The central axes of the four support rods 113 are parallel to the central axis of the first valve body 101.

[0068] The second plunger valve has the same structure as the first plunger valve, so it will not be described again here.

[0069] The first plunger valve and the second plunger valve in this invention can also be other structures disclosed in the prior art, as long as they can achieve the function of this invention, and no specific limitation is made here.

[0070]

Example 3

[0071] One end of the first pipeline 3 is the first material inlet 301. The side wall of the first pipeline 3 is perpendicularly connected to the first plunger valve 1 near the first material inlet 301. The central axis of the first pipeline 3 is perpendicular to the central axis of the first plunger valve 1. The other end of the first pipeline 3 is a beveled cut for oblique connection with the second plunger valve 2, which ensures that the angle between the central axis of the second plunger valve 2 and the central axis of the first pipeline 3 is 30-60°, so as to ensure that the material entering from the first pipeline 3 and the material entering from the third pipeline 5 can be fully and effectively mixed.

[0072]

Example 4

[0073] One end of the second pipeline 4 is the second material inlet 401, and the other end is a bevel. The bevel is connected to the first connection port 106, which can ensure that the angle between the central axis of the first plunger valve 1 and the central axis of the second pipeline 4 is 20-40°, so as to ensure that the catalyst can smoothly enter the first pipeline 3 from the second pipeline 4 and the first plunger valve 1 and be fully and effectively mixed with the material in the first pipeline 3.

[0074] The second pipeline 4 has a necking structure at one end located at the second material inlet. The inner diameter of the necking structure gradually decreases from the end of the second pipeline 4 inward. The purpose of the local necking is to control the flow rate of the material (catalyst) entering the second pipeline 4 at a certain speed (e.g., above 1.2 m / s) by calculating a suitable flow channel size, so as to prevent the material from settling locally in the second pipeline and clogging the pipeline.

[0075] Inside the second pipeline 4, located within the constricted structure, is a dispersion component 402. Its function is to further disperse the material (catalyst) entering the second pipeline 4 through the second material inlet 401, reducing localized agglomeration and ensuring uniform entry into the first pipeline 3 for thorough and effective mixing with the material (esterified product) already there. During PBST preparation, the catalyst can be added online into the polymer melt pipeline. Compared to the existing method of directly adding the catalyst into the reactor, this results in shorter residence and response times, enabling precise and rapid control of the polymer. It also effectively reduces the generation of low-quality transition materials, leading to significant economic benefits.

[0076] The dispersion component 402 includes grooves or protrusions disposed on the inner wall of the second pipeline. These grooves or protrusions are arranged along the axial direction on the inner wall of the second pipeline, and multiple grooves or protrusions are evenly distributed circumferentially. The grooves or protrusions can be configured in different shapes, such as S-shaped, serrated, wavy, etc. They are mainly used to ensure uniform dispersion of the catalyst slurry (solid-liquid mixture), avoiding localized accumulation or uneven distribution of solids.

[0077] The dispersion component 402 can be set in one or two sets in the second pipeline. If two sets are set, the shapes of the two dispersion components can be the same or different.

[0078]

Example 5

[0079] One end of the third pipeline 5 is the third material inlet 501, and the other end is the mixed material outlet 502. The side wall of the third pipeline 5 is perpendicularly connected to the second plunger valve 2, and the central axis of the third pipeline 5 is perpendicular to the central axis of the second plunger valve 2.

[0080]

Example 6

[0081] The jacketed multi-way plunger device is externally equipped with a jacket 6, which is used to introduce a heat medium to heat the polymer melt inside the entire device. The heat tracing temperature requirement is 250-270℃.

[0082] The jacket 6 is provided with at least one partition to divide the interior of the jacket cavity into at least two heat medium chambers. Each heat medium chamber has a heat medium inlet and a heat medium outlet on its corresponding jacket sidewall to ensure the heat tracing effect. Preferably, a partition is provided inside the jacket to divide the interior of the jacket cavity into two heat medium chambers, and each of the two heat medium chambers has a heat medium inlet and a heat medium outlet on its corresponding jacket sidewall to ensure the heat tracing effect.

[0083]

Example 7

[0084] The jacketed multi-channel plunger device of the present invention is used in flexible PBST production equipment and can be applied to production scenarios of multiple different grades of PBST products, allowing for flexible switching.

[0085] Operating Condition 1: When producing BH01 grade material, a series polymerization process is adopted. No catalyst is required here. At this time, the plunger of the second plunger valve 2 is screwed into the closed state to cut off the feed of the first material inlet 301 and the second material inlet 401. The material enters the downstream through the third material inlet 502.

[0086] Operating Condition 2: When used to produce BH02 grade material, a parallel polymerization process is adopted. No catalyst needs to be added after mixing. At this time, the plunger of the second plunger valve 2 is open and the plunger of the first plunger valve 1 is closed. The material enters the third pipeline 5 from the first material inlet 301 and the third material inlet 501 respectively, and is then sent downstream after mixing.

[0087] Operating Condition 3: When used to produce BH03 grade material, a parallel polymerization process is adopted. After mixing, a polycondensation catalyst needs to be added. At this time, the plunger of the second plunger valve 2 is opened and the plunger of the first plunger valve 1 is opened. The material enters the third pipeline 5 from the first material inlet 301 and the third material inlet 501 respectively for mixing. The catalyst enters from the second material inlet 401 and is mixed with the polymer melt before being sent downstream.

[0088] This invention integrates the first plunger valve and the second plunger valve into one unit through the arrangement of the pipeline, thereby realizing the functions of pipeline cut-off and flow, and at the same time realizing the continuous feeding of materials.

[0089] In this invention, by designing the second material inlet of the second pipeline as a constricted structure, the flow rate of the material (catalyst) entering through the second material inlet can be controlled, preventing local sedimentation and blockage of the pipeline.

[0090] In this invention, a dispersion component is provided inside the second pipeline to perform secondary dispersion on the material (catalyst) entering the second pipeline through the second material inlet, thereby reducing the possibility of local agglomeration and enabling it to enter the polymer melt uniformly.

[0091] This invention provides a jacket outside the entire jacketed multi-channel plunger device for introducing hot oil to heat the polymer melt inside the device. The heating temperature requirement is 250-270℃, which can ensure continuous material feeding and avoid pipe blockage.

[0092] This invention optimizes piping space and, compared with existing technologies, avoids the need to purchase multiple valves and pipe flanges, thus reducing procurement costs.

[0093] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0094] In the description of this invention, unless otherwise stated, the terms "upper," "lower," "left," "right," "inner," "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used 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 limitations on this invention.

[0095] The above technical solution is only one embodiment of the present invention. For those skilled in the art, based on the principles disclosed in the present invention, it is easy to make various types of improvements or modifications, and not limited to the technical solutions described in the specific embodiments of the present invention. Therefore, the foregoing description is only a preferred option and is not restrictive.

Claims

1. A jacketed multi-way plunger device, characterized in that, The system includes a first plunger valve and a second plunger valve. A first pipeline is vertically connected to the end of the first plunger valve; one end of the first pipeline is a first material inlet, and the other end is obliquely connected to the second plunger valve. The first plunger valve is obliquely connected to one end of the second pipeline, and the other end of the second pipeline is a second material inlet. A third pipeline is obliquely connected to the end of the second plunger valve; one end of the third pipeline is a third material inlet, and the other end is a mixed material outlet. The angle between the central axis of the first plunger valve and the central axis of the second pipeline is 20-40°; the angle between the central axis of the second plunger valve and the central axis of the first pipeline is 30-60°.

2. The jacketed multi-path plunger device according to claim 1, characterized in that, The first plunger valve is perpendicularly connected to the side wall of the first pipeline near the first material inlet. The other end of the first pipeline is a beveled cut, which is used to connect to the second plunger valve at an angle.

3. The jacketed multi-way plunger device according to claim 1, characterized in that, One end of the second pipeline has a beveled end, which is used to connect to the first plunger valve at an angle.

4. The jacketed multi-path plunger device according to claim 1, characterized in that, The second pipeline has a necking structure at one end located at the second material inlet.

5. The jacketed multi-path plunger device according to claim 4, characterized in that, The second pipeline is also equipped with a dispersion component located inside the necking structure; The dispersion component includes a groove or protrusion structure disposed on the inner wall of the second pipeline. The groove or protrusion structure is disposed along the axial direction on the inner wall of the second pipeline, and multiple grooves or protrusion structures are uniformly disposed along the circumference.

6. The jacketed multi-path plunger device according to claim 1, characterized in that, The sidewall of the third pipeline is perpendicularly connected to the second plunger valve.

7. The jacketed multi-path plunger device according to claim 1, characterized in that, The jacketed multi-way plunger device is provided with a jacket on its exterior. The jacket is provided with at least one partition to divide the interior of the jacket cavity into at least two heat medium cavities, and each heat medium cavity has a heat medium inlet and a heat medium outlet on the corresponding jacket side wall.

8. The application of the jacketed multi-channel plunger device as described in claim 1 in the preparation of phthalic acid-butanediol ester.

Images