Jacket multi-path plunger device and application

Abstract

The invention provides a jacket multi-path plunger device and application, and belongs to the field of pipeline engineering design. The jacket multi-path plunger device comprises a first plunger valve and a second plunger valve, the end part of the first plunger valve is vertically connected with a first pipeline, and the first plunger valve is obliquely connected with a second pipeline; the end of the second plunger valve is vertically connected with a third pipeline, and the first pipeline is obliquely connected with the second plunger valve. The first plunger valve and the second plunger valve are integrated through the arrangement direction of the pipeline, so that the functions of cutting off and circulating of the pipeline are achieved, and meanwhile continuous feeding of materials is achieved.

Description

Technical Field

[0001] The invention belongs to the field of pipeline engineering design, and in particular relates to a jacketed multi-channel plunger device and an application thereof. Background Art

[0002] In the preparation process of poly (butylene terephthalate-succinate-butylene terephthalate) (PDST), a plunger pump is required to inject the catalyst and fully mix it with the ester to prevent local catalyst accumulation from affecting the catalytic effect. The existing method for catalyst slurry injection uses multiple plunger valves to arrange the pipes, such as Figure 1 As shown, the two plunger valves are connected by pipelines. When in use, the two plunger valves are respectively injected with catalyst and esterification product. For some locations where it is difficult to lay pipes, the installation of this structure is difficult, and the actuator is prone to collision during on-site installation. Even if the installation is completed, since the existing plunger valves all use plunger valves with standard plunger valve flow channels, it is easy to cause poor circulation of PBST catalyst slurry, catalyst solid deposition blocking the feed pipeline, and unsatisfactory use effect. Summary of the invention

[0003] The purpose of the present invention is to solve the above-mentioned problems existing in the prior art and to provide a jacketed multi-channel plunger device and its application to realize the cutting and flow functions of the pipeline and the continuous feeding of materials.

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

[0005] A second object of the present invention is to provide an application of a jacketed multi-channel plunger device in the preparation of PDST.

[0006] The present invention is achieved through the following technical solutions:

[0007] In a first aspect of the present invention, there is provided a jacketed multi-way plunger device, comprising a first plunger valve and a second plunger valve;

[0008] The end of the first plunger valve is vertically connected to a first pipeline, and the first plunger valve is obliquely connected to a second pipeline;

[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] The present invention integrates the first plunger valve and the second plunger valve into one body through the arrangement direction of the pipeline, thereby realizing the cutting and flow functions of the pipeline and realizing the continuous feeding of the material.

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

[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:

[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:

[0016] One end of the first pipeline is a first material inlet, and a position on the side wall of the first pipeline close to the first material inlet is vertically connected to the first plunger valve;

[0017] The other end of the first pipeline is an oblique cut for oblique connection with the second plunger valve.

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

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

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

[0021] A necking structure is provided at one end of the second material inlet in the second pipeline, which can control the flow rate of the material (catalyst) entering through the second material inlet to prevent local sedimentation and blockage of the pipeline.

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

[0023] A dispersion component is also provided inside the second pipeline and located inside the neck structure, for secondary dispersion of the material (catalyst) entering the second pipeline through the second material inlet, thereby reducing the possibility of local agglomeration and enabling the material to enter the polymer melt evenly;

[0024] The dispersion component includes a groove or a protrusion structure arranged on the inner wall of the second pipeline. The groove or the protrusion structure is arranged on the inner wall of the second pipeline along the axial direction, and a plurality of grooves or protrusions are evenly arranged along the circumferential direction.

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

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

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

[0028] The jacketed multi-way plunger device is provided with a jacket on the outside, which is used to pass hot oil to heat the polymer melt in the device. The heating temperature is required to be 250-270°C, which can ensure that the material can be fed continuously and avoid clogging the pipeline;

[0029] At least one partition is arranged in the jacket, which is used to divide the interior of the jacket cavity into at least two heat medium chambers, and a heat medium inlet and a heat medium outlet are arranged on the jacket side wall corresponding to each heat medium chamber.

[0030] The second aspect of the present invention provides an application of a jacketed multi-channel plunger device in the preparation of butylene phthalate-succinate-butylene glycol ester.

[0031] Compared with the prior art, the present invention has the following beneficial effects:

[0032] The present invention integrates the first plunger valve and the second plunger valve into one body through the arrangement direction of the pipeline, thereby realizing the cutting and flow functions of the pipeline and realizing the continuous feeding of the material.

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

[0034] In the present invention, a dispersion component is arranged 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 the material to enter the polymer melt uniformly.

[0035] The present invention arranges a jacket outside the entire jacket multi-way plunger device for introducing hot oil to heat the polymer melt in the device. The heating temperature is required to be 250-270°C, which can ensure continuous feeding of materials and avoid clogging of pipelines.

[0036] The present invention can optimize the piping space, avoids the purchase of multiple valves and pipeline flanges, and reduces the purchase cost compared with the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 It is a schematic diagram of the structure of multiple plunger valve pipes used in the existing PBST device;

[0038] Figure 2 It is a structural schematic diagram of the jacketed multi-way plunger device of the present invention;

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

[0040] In the figure,

[0041] 1. First plunger valve, 101. First valve body, 102. Packing, 103. Packing gland, 104. Packing gland, 105. First connection part, 106. First connection port, 107. First valve stem, 108. First plunger, 109. First valve stem nut, 110. First hand wheel, 111. First support plate, 112. First support rod nut, 113 support rod,

[0042] 2. The 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 DESCRIPTION

[0047] The present invention is further described in detail below in conjunction with 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 end of the first plunger valve 1 is vertically connected to a first pipeline 3, and the first plunger valve 1 is obliquely connected to a second pipeline 4;

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

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

[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°, 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.

[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°, 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.

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

[0056] In the embodiment of the present invention, the first plunger valve 1 and the second plunger valve 2 are integrated into one body through the arrangement of the pipeline, so as to realize the cutting and flow functions of the pipeline and realize the continuous feeding of the material at the same time.

[0057] The present invention can optimize the piping space, avoids the purchase of multiple valves and pipeline flanges, and reduces the purchase cost compared with the prior art.

[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 hollow structure with openings at both ends. An annular groove is arranged on the inner side of one end of the first valve body 101, which is specifically formed by the inward extension of the end of the first valve body 101. The annular groove is filled with a packing 102, and is fixed at the end of the first valve body 101 in sequence by a packing sleeve 103 and a packing cover 104. The packing 102 is made of 304 stainless steel and polytetrafluoroethylene PTFE, and plays a sealing role. The other end of the first valve body 101 is connected to the first pipeline 3.

[0061] One end of the first valve body 101 provided with an annular groove is evenly provided with four first connecting parts 105 protruding outward along the circumferential direction, and the first connecting parts 105 are provided with threaded holes.

[0062] A first connection port 106 is provided on a side wall of one end of the first valve body 101 close to 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 that of the connection point of the second pipeline 4 .

[0063] The first valve stem assembly includes a first valve stem 107, one end of which is fixed with a first plunger 108, the first plunger 108 is disposed in the cavity of the first valve body 101, and can move along the axial direction in the cavity.

[0064] A first valve stem nut 109 is sleeved on the first valve stem 107, and a first hand wheel 110 is sleeved on the first valve stem nut 109. A first support plate 111 is sleeved on the first valve stem nut 109 near the inner side of the first hand wheel 110. Four first protruding connecting parts are evenly arranged on the outer wall of the first support plate 111 along the circumferential direction. A threaded through hole is provided on the first protruding connecting part. The positions of the threaded holes on the first connecting part 105 and the threaded through holes on the first protruding connecting part are adapted to each other, and a support rod 113 is connected between the corresponding threaded holes on the first connecting part 105 and the threaded through holes on the first protruding connecting part. Specifically, two ends of the support rod 113 are respectively connected to the threaded holes on the first connecting part 105 and the threaded through holes on the first protruding connecting part, and are fixed by the first support rod nut 112. When the first hand wheel 110 is turned, the first hand wheel 110 drives the first valve stem nut 109 to rotate, so that the first valve stem 107 moves up and down, thereby driving the first plunger 108 to move along the axial direction in the cavity structure of the first valve body 101 .

[0065] An anti-rotation pointer is provided between the two support rods 113 to prevent the first valve stem 107 from automatically rotating when the first hand wheel 110 rotates, thereby affecting the switch. Another function of the anti-rotation pointer is to indicate the opening 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 with each other, 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 structure of the second plunger valve is the same as that of the first plunger valve, which will not be described in detail here.

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

[0070] [Example 3]

[0071] One end of the first pipeline 3 is a first material inlet 301, and a position on the side wall of the first pipeline 3 close to the first material inlet 301 is vertically connected to the first plunger valve 1, and 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 an oblique cut, which is used to be obliquely connected to the second plunger valve 2, and can ensure 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 an oblique cut, which is connected to the first connecting port 106, so as to 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] A necking structure is provided at one end of the second pipeline 4 located at the second material inlet, and the inner diameter of the necking structure gradually decreases from the end of the second pipeline 4 inward. The purpose of local necking is to control the flow rate of the material (catalyst) entering the second pipeline 4 at a certain speed (for example, above 1.2 m / s) by calculating the appropriate flow channel size, so as to prevent the material from local sedimentation in the second pipeline and clogging the pipeline.

[0075] A dispersion component 402 is also provided inside the second pipeline 4, located inside the neck structure, and its function is to perform secondary dispersion on the material (catalyst) entering the second pipeline 4 through the second material inlet 401, reduce local agglomeration of the material, and allow it to evenly enter the first pipeline 3 and fully and effectively mix with the material (esterification product) in the first pipeline 3. During the preparation of PBST, the catalyst can be added online to the polymer melt pipeline. Compared with the existing method of directly adding the catalyst to the reactor, the residence time and response time are shorter, and the polymer can be accurately and quickly controlled, which can effectively reduce the generation of low-quality transition materials and has significant economic benefits.

[0076] The dispersion component 402 includes a groove or a protrusion structure arranged on the inner wall of the second pipeline, and the groove or protrusion structure is arranged on the inner wall of the second pipeline along the axial direction, and multiple grooves or protrusion structures are evenly arranged along the circumferential direction. The groove or protrusion structure can be set in different shapes, such as S-shaped, sawtooth-shaped, wavy, etc. It is mainly used to disperse the catalyst slurry (solid-liquid mixture) evenly to avoid local accumulation of solids or uneven distribution.

[0077] The dispersion components 402 may be provided in one group or two groups in the second pipeline. If two groups are provided, the shapes of the two groups of dispersion components may be the same or different.

[0078] [Example 5]

[0079] One end of the third pipeline 5 is a third material inlet 501 , and the other end is a mixed material outlet 502 . The side wall of the third pipeline 5 is vertically 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 provided with a jacket 6 on the outside for introducing heat medium to heat the polymer melt in the entire device, and the heating temperature is required to be 250-270°C.

[0082] At least one partition is provided in the jacket 6 to divide the interior of the jacket cavity into at least two heat medium cavities, and a heat medium inlet and a heat medium outlet are provided on the jacket side wall corresponding to each heat medium cavity to ensure the heating effect. Preferably, a partition is provided in the jacket to divide the interior of the jacket cavity into two heat medium cavities, and a heat medium inlet and a heat medium outlet are provided on the jacket side wall corresponding to the two heat medium cavities to ensure the heating effect.

[0083] [Example 7]

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

[0085] Working condition 1: When used to produce BH01 grade material, a series polymerization process is adopted. No catalyst needs to be added here. At this time, the plunger of the second plunger valve 2 is screwed in to the closed state, the feed of the first material inlet 301 and the second material inlet 401 is cut off, and the material enters the downstream from the third material inlet 502.

[0086] Working condition 2: When used to produce BH02 grade materials, a parallel polymerization process is adopted, and no catalyst needs to be added after mixing. At this time, the plunger of the second plunger valve 2 is opened, and the plunger of the first plunger valve 1 is closed. The materials enter the third pipeline 5 from the first material inlet 301 and the third material inlet 501 respectively, and are sent to the downstream after mixing.

[0087] Working condition three: When used to produce BH03 grade materials, a parallel polymerization process is adopted. A polycondensation catalyst needs to be added after mixing. At this time, the plunger of the second plunger valve 2 is opened, the plunger of the first plunger valve 1 is opened, and the materials enter the third pipeline 5 from the first material inlet 301 and the third material inlet 501 for mixing. The catalyst enters from the second material inlet 401, mixes with the polymer melt, and is then sent downstream.

[0088] The present invention integrates the first plunger valve and the second plunger valve into one body through the arrangement direction of the pipeline, thereby realizing the cutting and flow functions of the pipeline and realizing the continuous feeding of the material.

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

[0090] In the present invention, a dispersion component is arranged 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 the material to enter the polymer melt uniformly.

[0091] The present invention arranges a jacket outside the entire jacket multi-way plunger device for introducing hot oil to heat the polymer melt in the device. The heating temperature is required to be 250-270°C, which can ensure continuous feeding of materials and avoid clogging of pipelines.

[0092] The present invention can optimize the piping space, avoids the purchase of multiple valves and pipeline flanges, and reduces the purchase cost compared with the prior art.

[0093] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0094] In the description of the present invention, unless otherwise specified, the terms "upper", "lower", "left", "right", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

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

Claims

1. A jacketed multi-way plunger device, characterized in that: including a first plunger valve and a second plunger valve; The end of the first plunger valve is vertically connected to a first pipeline, and the first plunger valve is obliquely connected to a second pipeline; 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.

2. The jacketed multi-way plunger device according to claim 1, characterized in that: The angle between the central axis of the first plunger valve and the central axis of the second pipeline is 20-40°.

3. The jacketed multi-way plunger device according to claim 1, characterized in that: The angle between the central axis of the second plunger valve and the central axis of the first pipeline is 30-60°.

4. The jacketed multi-way plunger device according to claim 1, characterized in that: One end of the first pipeline is a first material inlet, and a position on the side wall of the first pipeline close to the first material inlet is vertically connected to the first plunger valve; The other end of the first pipeline is an oblique cut for oblique connection with the second plunger valve.

5. The jacketed multi-way plunger device according to claim 1, characterized in that: One end of the second pipeline is a second material inlet, and the other end is an oblique cut for oblique connection with the first plunger valve.

6. The jacketed multi-way plunger device according to claim 1, characterized in that: A necking structure is provided at one end of the second pipeline located at the second material inlet.

7. The jacketed multi-way plunger device according to claim 6, characterized in that: A dispersion component is also arranged inside the second pipeline and inside the neck structure; The dispersion component includes a groove or a protrusion structure arranged on the inner wall of the second pipeline. The groove or the protrusion structure is arranged on the inner wall of the second pipeline along the axial direction, and a plurality of grooves or protrusions are evenly arranged along the circumferential direction.

8. The jacketed multi-way plunger device according to claim 1, characterized in that: One end of the third pipeline is a third material inlet, and the other end is a mixed material outlet. The side wall of the third pipeline is vertically connected to the second plunger valve.

9. The jacketed multi-way plunger device according to claim 1, characterized in that: The jacketed multi-way plunger device is provided with a jacket on the outside; At least one partition is arranged in the jacket, which is used to divide the interior of the jacket cavity into at least two heat medium chambers, and a heat medium inlet and a heat medium outlet are arranged on the jacket side wall corresponding to each heat medium chamber.

10. Use of the jacketed multi-channel plunger device according to claim 1 in the preparation of butylene phthalate-succinate-butylene glycol ester.

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