A uniform heat transfer runner start-up valve for an extrusion pelletizer

Abstract

In view to the problem of uneven heat transfer and inconsistent heat transfer efficiency of the existing extrusion granulator starting valve, a kind of even heat transfer runner starting valve for extrusion granulator is disclosed, including starting valve main body A, heat transfer runner B is set in main body, it is characterized in that, the heat transfer runner adopts series-parallel hybrid layout, including inlet (1), first shunt point (2), first parallel runner group (3), first parallel runner lower runner (4), first parallel runner upper runner (5), intermediate series connection runner (6), upward runner (7), second shunt point (8), second parallel runner group (9), second parallel runner left runner (10), second parallel runner right runner (11), convergence series connection runner (12), outlet (13).

Description

Technical Field

[0001] This application relates to the field of plastic extrusion granulation equipment, and more specifically to a start-up valve for a uniform heat transfer channel in an extrusion granulation unit. Background Technology

[0002] In the petrochemical industry, extrusion granulation is a key process for producing plastic granules. The start-up valve of the extrusion granulator is one of its core components. Its main function is to switch the material flow direction when the equipment starts up, stops, or malfunctions, directing unqualified materials to the waste system, thereby protecting the main equipment and ensuring product quality.

[0003] During operation, the uniformity of valve body temperature is crucial. Uneven temperature can lead to the following problems:

[0004] 1. Material issues: Temperature fluctuations in the material inside the valve body can cause changes in its viscosity, which may lead to local blockage, coking, or material degradation, affecting product consistency.

[0005] 2. Equipment problems: Due to the different coefficients of thermal expansion of moving parts such as valve body and valve stem, uneven temperature can lead to changes in the fit clearance, causing sealing failure (leaking) or movement interference (jamming), increasing the equipment failure rate.

[0006] The heat transfer channel of the start-up valve in the prior art (such as...) Figure 3 The valve (as shown) exhibits a significant defect: the flow channel layout fails to adequately consider the constraints of the valve body's complex geometry, resulting in uneven flow distribution and large velocity differences among the branch flow paths. This leads to inconsistent heat exchange efficiency of the temperature control medium (such as heat transfer oil) and poor overall temperature uniformity of the valve body, thus causing the two problems mentioned above. Utility Model Content

[0007] To address the shortcomings of existing technologies, this application aims to provide a uniform heat transfer flow channel start-up valve for extrusion granulators. Through innovative flow channel layout and CFD simulation optimization, the flow rate of the temperature control medium is ensured to be balanced in each branch flow path, thereby achieving a uniform temperature distribution in the valve body and reducing key problems in production.

[0008] To achieve the above objectives, this application adopts the following technical solution:

[0009] A uniform heat transfer flow channel start-up valve for an extrusion granulator, wherein the start-up valve has a heat transfer flow channel inside;

[0010] The heat transfer channels adopt a series-parallel hybrid layout, including inlet 1, first branch point 2, first parallel channel group 3, first parallel channel lower channel 4, first parallel channel upper channel 5, intermediate series channel 6, upward channel 7, second branch point 8, second parallel channel group 9, second parallel channel left channel 10, second parallel channel right channel 11, converging series channel 12, and outlet 13.

[0011] The temperature-controlled fluid flows in from the inlet 1, enters the first parallel flow channel group 3 at the first branch point 2 and splits into two paths, namely the lower flow channel 4 and the upper flow channel 5 of the first parallel flow channel. Then it merges and enters the intermediate series flow channel 6. After two up-and-down reciprocating cycles, it enters the upward flow channel 7. At the second branch point 8, it enters the second parallel flow channel group 9 and splits into two paths, namely the left flow channel 10 and the right flow channel 11 of the second parallel flow channel. After merging, it enters the converging series flow channel 12 and flows out from the outlet 13.

[0012] The first diversion point 2 is located at a distance of 10-11% from top to bottom along the vertical line connecting the lower channel 4 and the upper channel 5 of the first parallel channel.

[0013] The second diversion point 8 is located at a distance of 7-8% from left to right on the horizontal line connecting the left channel 10 and the right channel 11 of the second parallel flow channel.

[0014] The positions of the first branch point 2 and the second branch point 8 ensure that the flow rate deviation of the temperature-controlled fluid flowing through each branch of the heat transfer channel is less than 5%. The positions of the first branch point 2 and the second branch point 8 are determined through optimization using CFD simulation, ensuring that the flow rate and velocity of the temperature-controlled fluid between the lower channel 4 and the upper channel 5 of the first parallel channel are basically consistent, and ensuring that the flow rate and velocity of the temperature-controlled fluid between the second parallel channel group 9, the left channel 10 and the right channel 11 of the second parallel channel are basically consistent.

[0015] The heat transfer channel is embedded in the start-up valve, and its layout avoids the valve stem movement mechanism and fasteners.

[0016] The advantages of this application are:

[0017] Compared with the prior art, this application has the following significant advantages:

[0018] 1. Temperature uniformity: Through simulation-optimized flow channel design, the flow balance of each branch flow path is forcibly achieved, thereby ensuring a uniform temperature field across the entire start-up valve and effectively preventing material and equipment problems caused by uneven temperature.

[0019] 2. Adaptable to complex structures: The hybrid layout is highly flexible and can perfectly adapt to the complex geometric space and structural constraints inside the start-up valve, achieving efficient and comprehensive heat transfer effects. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the start-up valve and its flow path in this application.

[0021] Figure 2 This is a schematic diagram of the flow path of the start-up valve in this application.

[0022] Figure 3 This is a schematic diagram of the flow path of the existing start-up valve.

[0023] Figure 4 This is a flow path velocity streamline diagram for the start-up valve of this application.

[0024] Figure 5 This is a schematic diagram of the velocity streamline of the existing start-up valve flow channel.

[0025] Among them, A is the start valve body, B is the heat transfer flow channel, 1 is the inlet, 2 is the first branch point, 3 is the first parallel flow channel group, 4 is the lower flow channel of the first parallel flow channel, 5 is the upper flow channel of the first parallel flow channel, 6 is the intermediate series flow channel, 7 is the upward flow channel, 8 is the second branch point, 9 is the second parallel flow channel group, 10 is the left flow channel of the second parallel flow channel, 11 is the right flow channel of the second parallel flow channel, 12 is the converging series flow channel, and 13 is the outlet. Detailed Implementation

[0026] The present application is described in detail below with reference to the embodiments, but the present application is not limited to these embodiments.

[0027] Example 1

[0028] A uniform heat transfer flow channel start-up valve for an extrusion granulator, wherein the start-up valve has a heat transfer flow channel inside;

[0029] The heat transfer channels adopt a series-parallel hybrid layout, including inlet 1, first branch point 2, first parallel channel group 3, first parallel channel lower channel 4, first parallel channel upper channel 5, intermediate series channel 6, upward channel 7, second branch point 8, second parallel channel group 9, second parallel channel left channel 10, second parallel channel right channel 11, converging series channel 12, and outlet 13.

[0030] The temperature-controlled fluid flows in from the inlet 1, enters the first parallel flow channel group 3 at the first branch point 2 and splits into two paths, namely the lower flow channel 4 and the upper flow channel 5 of the first parallel flow channel. Then it merges and enters the intermediate series flow channel 6. After two up-and-down reciprocating cycles, it enters the upward flow channel 7. At the second branch point 8, it enters the second parallel flow channel group 9 and splits into two paths, namely the left flow channel 10 and the right flow channel 11 of the second parallel flow channel. After merging, it enters the converging series flow channel 12 and flows out from the outlet 13.

[0031] The first diversion point 2 is located at a distance of 10-11% from top to bottom along the vertical line connecting the lower channel 4 and the upper channel 5 of the first parallel channel.

[0032] The second diversion point 8 is located at a distance of 7-8% from left to right on the horizontal line connecting the left channel 10 and the right channel 11 of the second parallel flow channel.

[0033] The positions of the first branch point 2 and the second branch point 8 ensure that the flow rate deviation of the temperature-controlled fluid flowing through each branch of the heat transfer channel is less than 5%. The positions of the first branch point 2 and the second branch point 8 are determined through optimization using CFD simulation, ensuring that the flow rate and velocity of the temperature-controlled fluid between the lower channel 4 and the upper channel 5 of the first parallel channel are basically consistent, and ensuring that the flow rate and velocity of the temperature-controlled fluid between the second parallel channel group 9, the left channel 10 and the right channel 11 of the second parallel channel are basically consistent.

[0034] The heat transfer channel is embedded in the start-up valve, and its layout avoids the valve stem movement mechanism and fasteners.

[0035] The design method for the start-up valve is as follows:

[0036] Preliminary design: Based on the original three-dimensional structure of the start-up valve, the flow path is initially planned to ensure that the flow path can effectively cover all critical areas that require temperature control, while avoiding internal mechanical structures such as valve stems and bolts.

[0037] Simulation optimization: Flow field simulation was performed on the preliminary flow channel model using CFD software. Actual medium properties, inlet flow rate, and outlet pressure were set as boundary conditions. The velocity streamline diagram of the existing start-up valve was calculated, 5. In the diagram, there is a large velocity difference between the lower and upper channels of the first parallel flow channel and between the left and right channels of the second parallel flow channel. Through multiple iterative calculations, the geometric positions of the first split point (2) and the second split point (8) were adjusted until the optimized simulation results were obtained. Figure 4 In the figure, the velocity difference between the lower and upper channels of the first parallel flow channel and the left and right channels of the second parallel flow channel is small, and the flow deviation is less than 5%.

[0038] Final verification: The optimized flow channel model and valve body were subjected to fluid-structure interaction heat transfer simulation to verify whether the temperature distribution uniformity of the valve body under working conditions met the design requirements.

[0039] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any modifications or substitutions made by those skilled in the art within the scope of the technology disclosed in this application should be covered within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A start-up valve for a uniform heat transfer channel in an extrusion granulator, characterized in that, The start-up valve has a heat transfer channel inside; The heat transfer channels adopt a series-parallel hybrid layout, including an inlet (1), a first branch point (2), a first parallel channel group (3), a first parallel channel lower channel (4), a first parallel channel upper channel (5), an intermediate series channel (6), an upward channel (7), a second branch point (8), a second parallel channel group (9), a second parallel channel left channel (10), a second parallel channel right channel (11), a converging series channel (12), and an outlet (13).

2. The start-up valve for a uniform heat transfer channel in an extrusion granulator according to claim 1, characterized in that, The temperature-controlled fluid flows in from the inlet (1), enters the first parallel flow channel group (3) at the first branch point (2) and is divided into two paths, namely the lower flow channel (4) and the upper flow channel (5) of the first parallel flow channel. Then it merges and enters the intermediate series flow channel (6). After two up-and-down reciprocating cycles, it enters the upward flow channel (7). At the second branch point (8), it enters the second parallel flow channel group (9) and is divided into two paths, namely the left flow channel (10) and the right flow channel (11) of the second parallel flow channel. After merging, it enters the converging series flow channel (12) and flows out from the outlet (13).

3. The start-up valve for a uniform heat transfer channel in an extrusion granulator according to claim 1, characterized in that, The first diversion point (2) is located at a distance of 10-11% from top to bottom along the vertical line connecting the lower channel (4) of the first parallel channel and the upper channel (5) of the first parallel channel.

4. The start-up valve for a uniform heat transfer channel in an extrusion granulator according to claim 1, characterized in that, The second split point (8) is located at a distance of 7-8% from left to right along the horizontal line connecting the left channel (10) and the right channel (11) of the second parallel channel.

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