A device for detecting heat preservation effect of spinneret and its application

Abstract

The present invention provides a device for detecting the thermal insulation effect of a spinneret and its application, and belongs to the field of fiber manufacturing. The device for detecting the thermal insulation effect of a spinneret comprises: a refrigerator, a spinning environment simulation box and a liquid receiving tank; the spinneret to be detected is installed in the spinning environment simulation box; the refrigerator is connected to the spinning environment simulation box; the liquid receiving tank is arranged below the spinning environment simulation box. The present invention has a simple structure, low cost and is easy to implement. The present invention can realize the precise control of the temperature of the spinning stock solution, stabilize the dynamic viscosity of the spinning stock solution, improve the product quality, and provide data support and inspection means for improving the spinneret thermal insulation scheme.

Description

Technical Field

[0001] The invention belongs to the field of fiber manufacturing, and in particular relates to a spinneret heat preservation effect detection device and application thereof. Background Art

[0002] The method currently used in actual production is to measure the temperature of the stock solution at the outlet of the spinneret at ambient temperature and compare whether it meets the process conditions. It can be seen that the existing technology cannot directly measure the temperature of the stock solution when the spinneret is spinning in the coagulation bath, so the temperature control of the stock solution in the spinneret is not accurate in production. Summary of the invention

[0003] The purpose of the present invention is to solve the difficulties existing in the above-mentioned prior art, and to provide a spinneret insulation effect detection device and its application, which simulates the environment during spinneret production, and digitizes the spinneret insulation effect by detecting the spinneret inlet and outlet temperatures, which is beneficial to the precise control of the pre-spinning stock solution temperature, stabilizes the dynamic viscosity of the pre-spinning stock solution, improves product quality, and provides data support and inspection means for improving the spinneret insulation scheme.

[0004] The present invention is achieved through the following technical solutions:

[0005] A device for detecting the heat preservation effect of a spinneret, comprising a refrigerator, a spinning environment simulation box and a liquid receiving tank;

[0006] The spinneret to be tested is installed in the spinning environment simulation box;

[0007] The refrigerator is connected to the spinning environment simulation box;

[0008] The liquid receiving tank is arranged below the spinning environment simulation box.

[0009] The spinning environment simulation box comprises a box body and an upper cover covering the upper end of the box body;

[0010] Holes are opened on the side plate and the bottom plate of the box; the inlet end of the spinneret to be detected is installed at the opening of the side plate of the box, and the outlet end is installed at the opening of the bottom plate of the box;

[0011] The inlet end of the spinneret to be detected is connected to the stock solution tank through a stock solution input pipeline;

[0012] The raw liquid coming out of the outlet end of the spinneret to be detected falls downward into the liquid receiving tank.

[0013] The box body is provided with a refrigerant liquid input port and a refrigerant liquid output port;

[0014] The refrigerant input port is connected to the outlet of the refrigerator through a refrigerant input pipeline, and is used to input refrigerant into the spinning environment simulation box;

[0015] The refrigerant liquid outlet is connected to the inlet of the refrigerator through a refrigerant liquid outlet pipeline, and is used to transport the refrigerant in the spinning environment simulation box back to the refrigerator;

[0016] The refrigerant liquid inlet and the refrigerant liquid outlet are arranged on the same side or different sides of the box body;

[0017] The refrigerant liquid input port is arranged above the refrigerant liquid output port, or the refrigerant liquid input port is arranged below the refrigerant liquid output port.

[0018] A first ball valve and a float valve are arranged on the refrigerant liquid input pipeline, the float of the float valve floats on the liquid surface of the refrigerant in the spinning environment simulation box, the output port of the float valve is connected to the refrigerant liquid input port through a pipeline, and the input port of the float valve is connected to the output port of the first ball valve through a pipeline; the input port of the first ball valve is connected to the outlet of the refrigerator through a pipeline;

[0019] A second ball valve is provided on the refrigerant liquid output pipeline, the input port of the second ball valve is connected to the refrigerant liquid output port through a pipeline, and the output port of the second ball valve is connected to the inlet of the refrigerator through a pipeline;

[0020] A third ball valve is connected to the raw liquid input pipeline, an input port of the third ball valve is connected to the raw liquid input pipeline through a pipeline, and an output port of the third ball valve is connected to the external environment.

[0021] A first thermometer is provided at the center of the outlet end of the spinneret to be detected, for measuring the temperature T1 of the stock solution at the center of the outlet of the spinneret to be detected;

[0022] A second thermometer is provided at the edge of the outlet end of the spinneret, for measuring the temperature T2 of the raw liquid at the outlet edge of the spinneret to be detected;

[0023] A third thermometer is provided at the center of the output port of the third ball valve, for measuring the temperature T0 of the raw liquid in the raw liquid input pipeline;

[0024] A fourth thermometer is arranged in the box body for measuring the temperature of the refrigerant in the box body.

[0025] Preferably, a fixing plate is provided in the box body; the fixing plate is parallel to the bottom plate of the box body and is fixed above the bottom plate of the box body by fixing bolts;

[0026] A hole is opened in the center of the fixing plate, and the outlet end of the spinneret to be detected passes through the hole of the fixing plate and is installed at the opening of the bottom plate of the box.

[0027] A heat-insulating layer is wrapped around the outside of the spinning environment simulation box;

[0028] Sealing gaskets are arranged between the inlet end of the spinneret to be detected and the side plate of the box, and between the outlet end of the spinneret to be detected and the bottom plate of the box.

[0029] The method for detecting the heat preservation effect of a spinneret by using the spinneret heat preservation effect detection device comprises:

[0030] (1) Install the spinneret to be tested, add refrigerant, start the refrigerator, and set the temperature of the refrigerator;

[0031] (2) After the temperature of the refrigerant in the spinning environment simulation box is stabilized, the spinneret to be tested is connected to the stock solution tank, and the spinneret to be tested is turned on to allow the stock solution to be ejected from the spinneret to be tested. After T1 and T2 are stabilized, T0, T1, and T2 are measured respectively;

[0032] (3) Calculate the heat transfer rate of the spinneret to be tested using the following formula:

[0033]

[0034] Where, C is the specific heat of the stock solution, Q is the flow rate of the stock solution;

[0035] The heat preservation effect of the spinneret to be tested is judged by comparing the heat transfer rates: the smaller the heat transfer rate, the better the heat preservation effect of the spinneret to be tested.

[0036] The method for correcting the temperature control of the stock solution by using the spinneret heat preservation effect detection device comprises:

[0037] (1) Install the spinneret to be tested, add refrigerant, start the refrigerator, and set the temperature of the refrigerator to the coagulation bath temperature during spinning;

[0038] (2) After the temperature of the refrigerant in the spinning environment simulation box is stabilized, the spinneret to be tested is connected to the stock solution tank, and the spinneret to be tested is turned on to allow the stock solution to be ejected from the spinneret to be tested. After T1 and T2 are stabilized, T0, T1, and T2 are measured respectively;

[0039] (3) adjusting T0, determining whether T1 and T2 can fall within the process control temperature range at the same time, if so, finding the range of T0 that can ensure that T1 and T2 are both within the process control temperature range, and then proceeding to step (4); if not, determining that the insulation effect of the spinneret to be tested of this type cannot meet the production quality requirements, and proceeding to step (5);

[0040] (4) repeating steps (1) to (3) for a plurality of spinnerets to be tested of the same type, obtaining a range of T0 for each spinneret to be tested, and then calculating an average range of T0 for all spinnerets to be tested, and using the average range of T0 to correct the stock solution control temperature;

[0041] (5)End.

[0042] The operation of calculating the average range of T0 of all spinnerets to be detected in the step (4) comprises:

[0043] The lowest values ​​in the range of T0 of each spinneret to be detected are averaged as the lowest value of the average range of T0, and the highest values ​​in the range of T0 of each spinneret to be detected are averaged as the highest value of the average range of T0.

[0044] Compared with the prior art, the invention has the following beneficial effects: the invention has a simple structure, low cost and is easy to implement. The invention can realize accurate control of the temperature of the spinning solution, stabilize the dynamic viscosity of the spinning solution, improve product quality, and provide data support and inspection means for improving the spinneret insulation scheme. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] Figure 1 A schematic diagram of the structure of the device of the present invention;

[0046] Figure 2 Installation method of spinning environment simulation box and spinneret. DETAILED DESCRIPTION

[0047] The present invention is further described in detail below in conjunction with the accompanying drawings:

[0048] like Figure 1 As shown, the device for detecting the thermal insulation effect of a spinneret of the present invention includes a refrigerator 11 and a spinning environment simulation box 4, and holes are opened on the side panels and the bottom panel of the spinning environment simulation box 4 for installing the spinneret 5 to be detected. The spinneret 5 to be detected is a universal structure, including a gooseneck for introducing stock solution, a spinneret for ejecting stock solution, a guide and fixing component therebetween, an external thermal insulation sleeve, and the like. The inlet end of the spinneret 5 to be detected is arranged at the opening of the side panel of the spinning environment simulation box 4, and the outlet end is arranged at the opening of the bottom panel of the spinning environment simulation box 4. The inlet end of the spinneret 5 to be detected is connected to the stock solution tank via a stock solution input pipeline 15, and the stock solution input pipeline 15 is finally connected to the stock solution tank via chemical equipment such as a heat exchanger, a filter, and a pump (in Figure 1The spinning environment simulation box 4 in the present device is only used to simulate the temperature in the coagulation bath, and does not directly contact with the raw liquid, so Figure 1 The original solution is still in liquid state after passing through the spinneret.

[0049] The spinning environment simulation box 4 is wrapped with a heat preservation layer. Figure 2 As shown, the spinning environment simulation box 4 includes a box body 201 and an upper cover 204, wherein the upper cover 204 is covered on the box body 201, and a refrigerant liquid input port 202 and a refrigerant liquid output port 203 are opened on the box body 201. The spinneret 5 to be tested is arranged in the inner cavity of the box body 201, and a fixing plate 206 is sleeved on the spinneret 5 to be tested, and the fixing plate 206 is arranged parallel to the bottom plate of the box body 201 and fixed above the bottom plate of the box body 201 by fixing bolts 205. Specifically, a hole is opened in the center of the fixing plate 206, and the lower end of the spinneret 5 passes through the hole of the fixing plate 206 and communicates with the opening of the bottom plate of the box body 201.

[0050] The box body 201 is connected to the inlet and outlet of the refrigerator 11 through a pipeline. The connection method in this embodiment is as follows: a refrigerant liquid inlet is opened at the upper part of the box body, and the refrigerant liquid inlet is connected to the outlet of the refrigerator 11 through a refrigerant liquid inlet pipeline 13; a refrigerant liquid outlet is opened at the lower part of the spinning environment simulation box 4, and the refrigerant liquid outlet is connected to the refrigerator 11 through a refrigerant liquid outlet pipeline 14. Figure 1 This is a schematic diagram of the principle. For the sake of simplicity and clarity, Figure 1 In the embodiment, the refrigerant inlet and the refrigerant outlet are located on the same side of the box. Figure 2 In the embodiment, the two ports are arranged on different sides of the box body, which is conducive to uniform temperature of the liquid in the box. In actual use, the positions of the refrigerant liquid input port and the refrigerant liquid output port can be set according to actual needs. The liquid in the spinning environment simulation box can enter from the top and exit from the bottom, or from the bottom and exit from the top. The inlet and outlet can be arranged on the same side or on different sides. The refrigerator 11 can set the refrigeration temperature and automatically adjust the temperature of the stable circulating refrigerant (for example, chilled water can be used).

[0051] In order to measure the temperature, a first thermometer 8 is connected at the center of the outlet of the spinneret to be tested (in actual on-site operation, the thermometer is horizontally fixed on the simulation box bracket (the simulation box bracket is not shown in the figure) with a fixing buckle, so that the center of the thermometer bubble is located at the center of the stock solution flow) for measuring the temperature T1 of the stock solution at the center of the spinneret outlet; a second thermometer 9 is arranged at the edge of the outlet of the spinneret to be tested for measuring the temperature T2 of the stock solution at the edge of the spinneret outlet; a ball valve 7 is connected to the stock solution input pipeline 15, and the opening of the ball valve 7 is used for temperature measurement. The ball valve 7 is opened once every 10 minutes to immerse the bubble of the third thermometer 6 in the stock solution, and the temperature is measured once to obtain the temperature T0 of the stock solution in the stock solution input pipeline 15; a fourth thermometer 3 is arranged in the spinning environment simulation box 4 for measuring the temperature of the refrigerant in the spinning environment simulation box 4.

[0052] In order to control the flow of each pipeline, a first ball valve 1 and a float valve 2 are provided on the refrigerant liquid input pipeline 13, the float of the float valve 2 floats on the liquid surface of the refrigerant in the spinning environment simulation box 4, the output port of the float valve 2 is connected to the refrigerant liquid input port through a pipeline, the input port of the float valve 2 is connected to the output port of the first ball valve 1 through a pipeline, and the input port of the first ball valve 1 is connected to the outlet of the refrigerator 11 through a pipeline. A second ball valve 10 is provided on the refrigerant liquid output pipeline 14, the input port of the second ball valve 10 is connected to the refrigerant liquid output port through a pipeline, and the output port is connected to the inlet of the refrigerator 11 through a pipeline. A third ball valve 7 is connected to the raw liquid input pipeline 15, the input port of the third ball valve is connected to the raw liquid input pipeline 15 through a pipeline, and the output port is connected to the external environment.

[0053] One application of the device is to simulate the spinning environment and correct the stock solution to control the temperature. The specific steps include:

[0054] (1) Install the spinneret to be tested, add refrigerant, start the refrigerator, and set the temperature to the coagulation bath temperature during spinning.

[0055] (2) After the temperature of the refrigerant in the spinning environment simulation box is stable, the spinneret 5 to be tested is connected to the stock solution and the valve of the pipeline in front of the spinneret to be tested is opened (the valve is at Figure 1 (not shown), after the outlet stock solution temperature of the spinneret 5 is stable (i.e., T1 and T2 are both stable and the temperature does not change within 1 minute), the temperature T0 of the spinneret inlet pipeline stock solution, the temperature T1 of the spinneret outlet center stock solution, and the temperature T2 of the spinneret outlet edge stock solution are measured respectively.

[0056] (3) Externally adjust the inlet raw liquid temperature T0 and find the range of T0 that ensures that T1 and T2 are within the process control temperature range.

[0057] (4) Repeating steps 1)-3) for multiple spinnerets of the same type to be detected, obtaining the range of T0 of each spinneret to be detected, and then calculating the average range of T0 of all the spinnerets to be detected, and using the average range of T0 to correct the stock solution control temperature, that is, controlling the temperature of the stock solution within the average range of T0; the operation of calculating the average range of T0 of all the spinnerets to be detected includes: taking the average value of the lowest value in the range of T0 of each spinneret to be detected as the lowest value of the average range of T0, and taking the average value of the highest value in the range of T0 of each spinneret to be detected as the highest value of the average range of T0. For example, an experiment was conducted on 6 spinnerets to be tested, and 6 ranges of T0 were obtained through the above steps. Each range of T0 included a minimum value and a maximum value. The minimum values ​​in the 6 ranges of T0 were added and divided by 6 as the minimum value of the average range of T0. The maximum values ​​in the 6 ranges of T0 were added and divided by 6 as the maximum value of the average range of T0. In this way, the average range of T0 was obtained, which is between the minimum value of the average range of T0 and the maximum value of the average range of T0.

[0058] (5) If the externally adjusted inlet stock solution temperatures T0, T1, and T2 cannot fall within the process control temperature at the same time, it is determined that the thermal insulation effect of this type of spinneret cannot meet the production quality requirements.

[0059] Another application of the device is to test the heat preservation effect of a certain spinneret heat preservation scheme, and the specific steps include:

[0060] (1) Install the spinneret, add refrigerant, start the refrigerator, and set the temperature to a certain value.

[0061] (2) After the temperature of the refrigerant in the spinning environment simulation box is stable, the spinneret is connected to the stock solution and turned on. After the temperature of the stock solution at the spinneret outlet is stable (i.e., T1 and T2 are both stable and the temperature does not change within 1 minute), the stock solution temperature T0 of the spinneret inlet pipeline, the stock solution temperature T1 at the spinneret outlet center, and the stock solution temperature T2 at the spinneret outlet edge are measured respectively.

[0062] (3) Calculate the heat transfer rate of the spinneret under the temperature environment of the simulation box based on T0, T1, T2, the temperature of the refrigerant in the simulation box, and the flow rate of the raw liquid in the spinneret.

[0063] The formula is as follows:

[0064] The spinneret is under the temperature environment of the simulation box.

[0065] Where C is the specific heat of the stock solution, and Q is the flow rate of the stock solution.

[0066] Table 1 shows the experimental data of two spinnerets obtained by using the device of the present invention:

[0067]

[0068] Table 1

[0069] Substituting the experimental data in Table 1 into the above formula, the heat transfer rate of spinneret No. 1 is 2.5CQ, and the heat transfer rate of spinneret No. 2 is 3.35CQ. By comparison, it can be seen that the heat transfer rate of spinneret No. 1 is small, so the thermal insulation effect of spinneret No. 1 is better than that of spinneret No. 2.

[0070] 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 application methods and principles disclosed in the present invention, and it is not limited to the method described in the above specific implementation mode of the present invention. Therefore, the method described above is only preferred and does not have a restrictive meaning.

Claims

1. A device for detecting the heat preservation effect of a spinneret, characterized in that: The spinneret heat preservation effect detection device comprises: a refrigerator, a spinning environment simulation box and a liquid receiving tank; The spinneret to be tested is installed in the spinning environment simulation box; The refrigerator is connected to the spinning environment simulation box; The liquid receiving tank is arranged below the spinning environment simulation box; The spinning environment simulation box comprises a box body and an upper cover covering the upper end of the box body; Holes are opened on the side plate and the bottom plate of the box; the inlet end of the spinneret to be detected is installed at the opening of the side plate of the box, and the outlet end is installed at the opening of the bottom plate of the box; The inlet end of the spinneret to be detected is connected to the stock solution tank through a stock solution input pipeline; The stock solution coming out of the outlet end of the spinneret to be detected falls downward into the liquid receiving tank; A first thermometer is provided at the center of the outlet end of the spinneret to be detected, for measuring the temperature T1 of the stock solution at the center of the outlet of the spinneret to be detected; A second thermometer is arranged at the edge of the outlet end of the spinneret, for measuring the temperature T2 of the raw liquid at the outlet edge of the spinneret to be detected.

2. The spinneret heat preservation effect detection device according to claim 1, characterized in that: The box body is provided with a refrigerant liquid input port and a refrigerant liquid output port; The refrigerant input port is connected to the outlet of the refrigerator through a refrigerant input pipeline, and is used to input refrigerant into the spinning environment simulation box; The refrigerant liquid outlet is connected to the inlet of the refrigerator through a refrigerant liquid outlet pipeline, and is used to transport the refrigerant in the spinning environment simulation box back to the refrigerator; The refrigerant liquid inlet and the refrigerant liquid outlet are arranged on the same side or different sides of the box body; The refrigerant liquid input port is arranged above the refrigerant liquid output port, or the refrigerant liquid input port is arranged below the refrigerant liquid output port.

3. The spinneret heat preservation effect detection device according to claim 2, characterized in that: A first ball valve and a float valve are arranged on the refrigerant liquid input pipeline, the float of the float valve floats on the liquid surface of the refrigerant in the spinning environment simulation box, the output port of the float valve is connected to the refrigerant liquid input port through a pipeline, and the input port of the float valve is connected to the output port of the first ball valve through a pipeline; the input port of the first ball valve is connected to the outlet of the refrigerator through a pipeline; A second ball valve is provided on the refrigerant liquid output pipeline, the input port of the second ball valve is connected to the refrigerant liquid output port through a pipeline, and the output port of the second ball valve is connected to the inlet of the refrigerator through a pipeline; A third ball valve is connected to the raw liquid input pipeline, an input port of the third ball valve is connected to the raw liquid input pipeline through a pipeline, and an output port of the third ball valve is connected to the external environment.

4. The spinneret heat preservation effect detection device according to claim 3, characterized in that: A third thermometer is provided at the center of the output port of the third ball valve, for measuring the temperature T0 of the raw liquid in the raw liquid input pipeline; A fourth thermometer is arranged in the box body for measuring the temperature of the refrigerant in the box body.

5. The spinneret heat preservation effect detection device according to claim 1, characterized in that: A fixing plate is provided in the box body; the fixing plate is parallel to the bottom plate of the box body and is fixed above the bottom plate of the box body by fixing bolts; A hole is opened in the center of the fixing plate, and the outlet end of the spinneret to be detected passes through the hole of the fixing plate and is installed at the opening of the bottom plate of the box.

6. The spinneret heat preservation effect detection device according to claim 1, characterized in that: A heat-insulating layer is wrapped around the outside of the spinning environment simulation box; Sealing gaskets are arranged between the inlet end of the spinneret to be detected and the side plate of the box, and between the outlet end of the spinneret to be detected and the bottom plate of the box.

7. A method for detecting the heat preservation effect of a spinneret using the spinneret heat preservation effect detection device according to any one of claims 1 to 6, characterized in that: The method comprises: (1) Install the spinneret to be tested, add refrigerant, start the refrigerator, and set the temperature of the refrigerator; (2) After the temperature of the refrigerant in the spinning environment simulation box is stabilized, the spinneret to be tested is connected to the stock solution tank, and the spinneret to be tested is turned on to allow the stock solution to be ejected from the spinneret to be tested. After T1 and T2 are stabilized, T0, T1, and T2 are measured respectively; (3) Calculate the heat transfer rate of the spinneret to be tested using the following formula: Where, C is the specific heat of the stock solution, Q is the flow rate of the stock solution; The heat preservation effect of the spinneret to be tested is judged by comparing the heat transfer rates: the smaller the heat transfer rate, the better the heat preservation effect of the spinneret to be tested.

8. A method for correcting the temperature of the stock solution by using the spinneret heat preservation effect detection device according to any one of claims 1 to 6, characterized in that: The method comprises: (1) Install the spinneret to be tested, add refrigerant, start the refrigerator, and set the temperature of the refrigerator to the coagulation bath temperature during spinning; (2) After the temperature of the refrigerant in the spinning environment simulation box is stabilized, the spinneret to be tested is connected to the stock solution tank, and the spinneret to be tested is turned on to allow the stock solution to be ejected from the spinneret to be tested. After T1 and T2 are stabilized, T0, T1, and T2 are measured respectively; (3) adjusting T0, determining whether T1 and T2 can fall within the process control temperature range at the same time, if so, finding the range of T0 that can ensure that T1 and T2 are both within the process control temperature range, and then proceeding to step (4); if not, determining that the insulation effect of the spinneret to be tested of this type cannot meet the production quality requirements, and proceeding to step (5); (4) repeating steps (1) to (3) for a plurality of spinnerets to be tested of the same type, obtaining a range of T0 for each spinneret to be tested, and then calculating an average range of T0 for all spinnerets to be tested, and using the average range of T0 to correct the stock solution control temperature; (5)End.

9. The method according to claim 8, characterized in that: The operation of calculating the average range of T0 of all spinnerets to be detected in the step (4) comprises: The lowest values ​​in the range of T0 of each spinneret to be detected are averaged as the lowest value of the average range of T0, and the highest values ​​in the range of T0 of each spinneret to be detected are averaged as the highest value of the average range of T0.

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