Defoaming system for viscose spinning pretreatment and viscose spinning pretreatment equipment

Abstract

The invention relates to the technical field of viscose production, in particular to a defoaming system for viscose spinning pretreatment and viscose spinning pretreatment equipment. In an adhesive conveying unit of the defoaming system, each defoaming barrel is communicated with an air inlet of a condenser, and the condenser is communicated with a dry vacuum pump; a water outlet of the condenser communicates with the heat exchanger. The vacuum condensation unit is used for condensing and recycling gas generated in the defoaming process of the viscose conveying unit, so that the use amount of steam can be effectively reduced, and bubbles in viscose can be removed as much as possible; a heat exchanger in the vacuum condensation unit can exchange heat for condensate water, so that the use amount of a cooling medium can be reduced, and a good heat exchange effect can be ensured; the device for measuring the pressure, the temperature and the flow is arranged in the viscose conveying unit, and the valve capable of being automatically controlled is arranged, so that the liquid level, the temperature and the vacuumizing process in the defoaming barrel can be effectively and automatically controlled, the production cost is effectively reduced, and the production efficiency is improved.

Description

Technical Field

[0001] This invention relates to the field of viscose production technology, and more specifically, to a defoaming system and equipment for viscose spinning pretreatment. Background Technology

[0002] In the process of viscose degassing, depending on the equipment used, there are two methods: static degassing and continuous degassing. Static degassing is generally carried out in the spinning drum. Static degassing can remove air bubbles and requires 10-30 hours, but it cannot remove dissolved air. Continuous degassing, on the other hand, makes the viscose into a thin film, which actively destroys the air bubbles and removes as many air bubbles as possible from the viscose. It generally uses a three-stage or five-stage steam jet pump to generate a high vacuum, which boils the water in the viscose, removes the latent heat of the viscose, lowers the viscose temperature by about 4°C, and evaporates about 1% of the water in the viscose.

[0003] Continuous degassing removes air bubbles from adhesives rapidly and continuously. Most current degassing systems employ a two-stage steam jet pump, a two-stage condensation system, and a water ring vacuum pump to maintain a vacuum level of ≤0.030 bar within the degassing tank. Each system has one degassing tank. Gases contained in the adhesive within the tank pass through a primary condenser and enter the primary steam jet pump. Condensate enters a drain tank. Gases then enter a secondary condenser and enter the secondary steam jet pump. Condensate enters another drain tank, and the gases are discharged via the water ring vacuum pump. The adhesive passes through a tank filter and enters the adhesive pump, which then delivers it to the degassing tank. After air bubbles are removed in the degassing tank, the adhesive proceeds to the next process. Fluctuations in the liquid level in the degassing tank require manual adjustment of the adhesive pump speed.

[0004] The aforementioned degassing process consumes large amounts of steam and chilled water, and the liquid level in the degassing tank is unstable, making it difficult to effectively reduce production costs. Furthermore, the resulting spun fibers are prone to breakage, leading to poor product quality. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a defoaming system and a viscose spinning pretreatment device for viscose spinning pretreatment.

[0006] The technical solution of the present invention to solve the above-mentioned technical problems is as follows: This invention provides a degassing system for pretreatment of viscose spinning, comprising a viscose conveying unit and a vacuum condensing unit; the viscose conveying unit includes at least one degassing tank, and the vacuum condensing unit includes a condenser, a dry vacuum pump, and a heat exchanger; each degassing tank is connected to the air inlet of the condenser through a degassing tank exhaust pipe, and the air outlet of the condenser is connected to the dry vacuum pump; the water outlet of the condenser is connected to the heat exchanger.

[0007] Based on the above technical solution, the present invention can be further improved as follows.

[0008] Furthermore, a water tank is provided between the outlet of the condenser and the heat exchanger, and the inlet of the water tank is connected to the outlet of the condenser through a water pipe; The outlet of the water tank is connected to the heat exchanger through the heat exchanger inlet pipe, and a water circulation pump is installed on the heat exchanger inlet pipe. The outlet of the heat exchanger is connected to the return port of the condenser through the heat exchanger outlet pipe.

[0009] Furthermore, a water temperature gauge is installed on the drain pipe, and a temperature transmitter is installed on the heat exchanger outlet pipe.

[0010] Furthermore, the heat exchanger is also provided with a condensate inlet and a condensate outlet.

[0011] Furthermore, a degassing tank pressure gauge is installed on the exhaust pipe of the degassing tank, and a vacuum pressure gauge is installed on the pipe connecting the condenser and the dry vacuum pump.

[0012] Furthermore, the adhesive inlet of the degassing tank is connected to the degassing tank inlet pipe, and an adhesive pump is installed on the degassing tank inlet pipe. A pressure transmitter is installed between the adhesive pump and the degassing tank. Each degassing tank adhesive inlet is also equipped with a degassing tank self-control valve, and each degassing tank is equipped with a liquid level switch.

[0013] Furthermore, the inlet pipe of the degassing tank is equipped with an adhesive temperature gauge, and the adhesive outlet of each degassing tank is equipped with an adhesive temperature gauge and a shut-off valve.

[0014] Furthermore, a canister filter is also provided on the inlet pipe of the degassing tank, and the canister filter is located upstream of the adhesive pump.

[0015] Furthermore, there are multiple degassing tanks, which are connected in parallel between the degassing tank inlet pipe and the degassing tank outlet pipe.

[0016] The present invention also provides a viscose spinning pretreatment device, which includes a mixing system, a filtration system and a curing system in sequence, and further includes a degassing system and a spinning glue filtration system as described above; the viscose inlet of the degassing tank is connected to the curing system, and the viscose outlet of the degassing tank is connected to the spinning glue filtration system.

[0017] The beneficial effects of this invention are as follows: (1) The degassing system for viscose spinning pretreatment of the present invention is provided with a viscose conveying unit and a vacuum condensing unit. The vacuum condensing unit condenses and recovers the gas generated by the viscose conveying unit during the degassing process, which can effectively reduce the amount of steam used and remove as many bubbles as possible from the viscose. (2) The degassing system for viscose spinning pretreatment of the present invention has a heat exchanger in the vacuum condensation unit that can exchange heat with the condensate, which can not only reduce the amount of cooling medium used, but also ensure good heat exchange effect. (3) The degassing system for viscose spinning pretreatment of the present invention is equipped with pressure, temperature and flow measurement devices in the viscose conveying unit and with automatically controllable valves, which can effectively realize automatic control of liquid level, temperature and vacuuming process in degassing tank, effectively reduce production costs and improve production efficiency. (4) The viscose spinning pretreatment equipment of the present invention is equipped with a spinning glue filtration system after degassing to remove impurities in the viscose, improve the spinnability of the viscose, improve product quality, and also ensure that the die-off nozzle is not blocked and the yarn is smoothly produced. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the degassing system for viscose spinning pretreatment according to the present invention; Figure 2 This is a schematic diagram of the structure of the viscose spinning pretreatment equipment in Embodiment 1 of the present invention; Figure 3 This is a schematic diagram of the structure of the hybrid system in Embodiment 1 of the present invention; Figure 4 This is a schematic diagram of the filtration system in Embodiment 1 of the present invention; Figure 5 This is a schematic diagram of the curing system in Embodiment 1 of the present invention; Figure 6 This is a diagram of the spinning adhesive filtration system of the present invention.

[0019] The attached diagram lists the components represented by each number as follows: 1. Canister filter; 2. Speed ​​switch; 3. Adhesive pump; 4. Pressure transmitter; 5. Adhesive thermometer; 6. Deaerator tank automatic control valve; 7. Deaerator tank; 8. Level switch; 9. Adhesive thermometer; 10. Shut-off valve; 11. Deaerator tank pressure gauge; 12. Condenser; 13. Vacuum pressure gauge; 14. Dry vacuum pump; 15. Water discharge thermometer; 16. Water discharge tank; 17. Water circulation pump; 18. Heat exchanger; 19. Temperature transmitter; 20. Chilled water regulating valve; 21. Deaerator tank outlet pipe 22. Deaeration tank inlet pipe; 23. Deaeration tank exhaust pipe; 24. Dry vacuum pump exhaust pipe; 25. Drain pipe; 26. Chilled water inlet pipe; 27. Heat exchanger inlet pipe; 28. Chilled water drain pipe; 29. ​​Flow meter; 30. Mixing tank; 31. Filtration system adhesive transfer pump; 32. First stage KKF filter; 33. Maturation tank; 34. Spinning adhesive filtration system adhesive transfer pump; 35. Second stage KKF filter; 36. Candle filter; 37. Heat exchanger outlet pipe; 100. Mixing system; 200. Filtration system; 300. Maturation system; 400. Defoaming system; 500. Spinning adhesive filtration system. Detailed Implementation

[0020] The principles and features of the present invention are described below. The examples given are only for explaining the present invention and are not intended to limit the scope of the present invention.

[0021] like Figure 1 As shown, the degassing system for viscose spinning pretreatment of the present invention includes a viscose conveying unit and a vacuum condensing unit; the viscose conveying unit includes at least one degassing tank 7, and the vacuum condensing unit includes a condenser 12, a dry vacuum pump 14 and a heat exchanger 18; each degassing tank 7 is connected to the air inlet of the condenser 12 through a degassing tank exhaust pipe 23, and the air outlet of the condenser 12 is connected to the dry vacuum pump 14; the water outlet of the condenser 12 is connected to the heat exchanger 18.

[0022] The degassing system for viscose spinning pretreatment of the present invention achieves vacuuming of the degassing tank 7 through a condenser 12 and a dry vacuum pump 14. The dry vacuum pump 14 extracts gas from the viscose in the degassing tank 7, and the gas enters the dry vacuum pump 14 through the degassing tank exhaust pipe 23, condenser 12, and is thus discharged. This vacuum condensation unit can maintain the vacuum level inside the degassing tank 7, and the condensate after condensation in the condenser 12 can be recycled after heat exchange through the heat exchanger 18. This effectively reduces the amount of steam used in the degassing process and significantly improves the degassing effect of the viscose.

[0023] Preferably, a water tank 16 is provided between the outlet of the condenser 12 and the heat exchanger 18. The inlet of the water tank 16 is connected to the outlet of the condenser 12 through a water pipe 25. The condensate after condensation in the condenser 12 falls into the water tank 16 and is then transported to the heat exchanger 18 for heat exchange and can be recycled.

[0024] Preferably, the outlet of the water tank 16 is connected to the heat exchanger 18 through the heat exchanger inlet pipe 27, and a water circulation pump 17 is provided on the heat exchanger inlet pipe 27; the outlet of the heat exchanger 18 is connected to the return water port of the condenser 12 through the heat exchanger outlet pipe 37.

[0025] Preferably, a downpipe 25 is equipped with a downpipe thermometer 15, and a temperature transmitter 19 is equipped on the heat exchanger outlet pipe 37.

[0026] The temperature transmitter 19 on the heat exchanger outlet pipe 37 can control the opening and closing of the valve on the pipe according to the monitored temperature. In this way, the circulating water after heat exchange can be controlled according to the return water temperature after heat exchange and the temperature in the condenser 12, thereby adjusting the water temperature by controlling the valve opening.

[0027] Preferably, the heat exchanger 18 is also provided with a condensing medium inlet and a condensing medium outlet; through the condensing medium inlet and the condensing medium outlet, condensing medium can be introduced into the heat exchanger 18 to effectively complete heat exchange.

[0028] Preferably, the condensing medium is chilled water. The chilled water enters the heat exchanger 18 through the chilled water inlet pipe 26, and after heat exchange, it is discharged from the heat exchanger 18 through the chilled water drain pipe 28. A chilled water regulating valve 20 is provided on the chilled water drain pipe 28. The chilled water regulating valve 20 is connected to the temperature transmitter 19. The opening degree of the chilled water regulating valve 20 can be adjusted by the temperature transmitter 19, and the water temperature can be adjusted by controlling the inflow and outflow of chilled water.

[0029] Preferably, a degassing tank pressure gauge 11 is provided on the exhaust pipe 23 of the degassing tank, and a vacuum pressure gauge 13 is provided on the pipe connecting the condenser 12 and the dry vacuum pump 14. The pressure can be measured by the above two pressure gauges to monitor the vacuum degree of the degassing tank 7, and the condensation and vacuuming process can also be controlled by the monitored pressure.

[0030] Preferably, the dry vacuum pump 14 is also provided with a dry vacuum pump exhaust pipe 24, which can be used to discharge gas.

[0031] Preferably, the condenser 12 is also provided with a soft water inlet; soft water can be added to the condenser 12 through the soft water inlet, so that the water vapor in the gas extracted from the degassing tank can be condensed, and the condensed water can be reused in the system.

[0032] In the degassing system for viscose spinning pretreatment of the present invention, the viscose inlet of the degassing tank 7 is connected to the degassing tank inlet pipe 22, the degassing tank inlet pipe 22 is equipped with a viscose pump 3, and a pressure transmitter 4 is provided between the viscose pump 3 and the degassing tank 7; each degassing tank 7 is also equipped with a degassing tank self-control valve 6 at the viscose inlet, and each degassing tank 7 is equipped with a liquid level switch 8.

[0033] To maintain a stable liquid level in the degassing tank 7, the level switch 8 controls the flow rate of adhesive entering the degassing tank 7, thereby controlling the opening of the self-control valve 6 in the degassing tank; the pressure transmitter 4 controls the pumping speed of the adhesive pump 3, thereby achieving a stable liquid level in the degassing system.

[0034] Preferably, the adhesive pump 3 is equipped with a speed switch 2.

[0035] Preferably, the inlet pipe 22 of the degassing tank is equipped with an adhesive thermometer 5, and the adhesive outlet of each degassing tank 7 is equipped with an adhesive thermometer 9 and a shut-off valve 10. Based on the temperatures measured by the adhesive thermometer 5 and the adhesive thermometer 9, the temperature difference between the inlet and outlet of the degassing tank 7 can be calculated by the DCS program, thereby enabling monitoring of the degassing effect. When the temperature difference is too small, it indicates that less gas has been extracted from the adhesive, and the temperature change of the adhesive is small. Even if the vacuum degree is maintained below 0.030 bar, the degassing effect in the adhesive is not good.

[0036] Preferably, a canister filter 1 is also provided on the inlet pipe 22 of the degassing tank, and the canister filter 1 is located upstream of the adhesive pump 3; the adhesive before entering the degassing tank 7 can be filtered by the canister filter 1, thereby improving the degassing effect.

[0037] Preferably, there are multiple degassing tanks 7, which are connected in parallel between the degassing tank inlet pipe 22 and the degassing tank outlet pipe 21.

[0038] Preferably, during degassing, the vacuum degree in the degassing system 400 is less than or equal to 0.030 bar, which ensures that the adhesive can enter and exit the multiple degassing tanks 7 at the same time.

[0039] like Figure 2-6 As shown, the viscose spinning pretreatment equipment of the present invention includes, in sequence, a mixing system 100, a filtration system 200 and a maturation system 300, and also includes a degassing system 400 and a spinning adhesive filtration system 500 as described above; the viscose inlet of the degassing tank 7 is connected to the maturation system 300, and the viscose outlet of the degassing tank 7 is connected to the spinning adhesive filtration system 500.

[0040] Preferably, a filtration system adhesive transfer pump 31 is installed on the pipeline between the spinning adhesive filtration system 500 and the mixing system 100. The spinning adhesive filtration system 500 includes two parallel-connected secondary KKF filters 35 and a candle filter 36. The outlet end of the degassing tank outlet pipeline 21 is connected to the two parallel-connected secondary KKF filters 35, and a spinning adhesive filtration system adhesive transfer pump 34 is installed on the connected pipeline. The two parallel-connected secondary KKF filters 35 are connected to the candle filter 36.

[0041] Preferably, the second KKF filter 35 is a KK18 fully automatic cleaning adhesive filter, which uses a single-sided screen. This adhesive filter can reduce the outlet pressure of the adhesive pump during filtration and extend the service life of the filter screen.

[0042] Preferably, the filtration accuracy of the candle-shaped filter 36 is smaller than the spinneret orifice diameter, removing impurities from the adhesive, ensuring that the spinneret is not clogged, and allowing for smooth filament output.

[0043] Preferably, the candle filter 36 has a filtration accuracy of 200 mesh.

[0044] The addition of the above-mentioned spinning adhesive filtration system 500 to the viscose spinning pretreatment equipment of the present invention can effectively improve the spinnability of viscose.

[0045] The mixing system 100 of the present invention can reduce the quality inhomogeneity of each batch of viscose caused by fluctuations in manufacturing process or operation, and ensure the stability of finished fiber quality.

[0046] Preferably, the mixing system 100 includes multiple mixing tanks 30 connected in parallel. Each mixing tank 30 has a large volume, capable of storing several batches of adhesive. It acts as a temporary buffer in case of a failure in any step of the adhesive preparation process, ensuring the stability of continuous production. An internal stirrer is installed inside each mixing tank 30 to mix the adhesive, effectively increasing the mixing volume and resulting in a more uniform adhesive mixture.

[0047] The filtration system 200 of the present invention can remove undissolved or semi-dissolved particles in the viscose to prevent clogging of the spinneret orifice and fiber breakage during spinning.

[0048] Preferably, the filtration system 200 includes two parallel KKF filters 32; the first KKF filter 32 is the same as the second KKF filter.

[0049] In the viscose spinning pretreatment equipment of the present invention, the viscose is mixed and then enters a first filtration stage, and after degassing, it enters a second filtration stage, which can continuously and stably transport the viscose to the next process.

[0050] In the curing system 300 of the present invention, multiple curing tanks 33 are connected in series, which can ensure the pressure stability of the curing system 300 and enable the viscose to complete the secondary esterification reaction in the curing tanks 33, thereby improving the quality of the viscose and making the curing degree and spinnability of the viscose meet the requirements of spinning and forming.

[0051] The present invention will be specifically described below through examples.

[0052] Example The viscose spinning pretreatment equipment of this embodiment includes a mixing system 100, a filtration system 200 and a maturation system 300, as well as a degassing system 400 and a spinning adhesive filtration system 500 as described above; the viscose inlet of the degassing tank 7 is connected to the maturation system, and the viscose outlet of the degassing tank 7 is connected to the spinning adhesive filtration system.

[0053] The mixing system 100 contains four mixing tanks 30. Each mixing tank 30 is a vertical steel tank with an inner diameter of 4.2m, featuring elliptical heads at the top and bottom. The tank is made of carbon steel, with a painted inner wall, and has an effective volume of 60m³. 3 The tank is equipped with a vertical agitator to mix the adhesive, effectively increasing the mixing volume and making the adhesive more uniform. Each tank has independent valves on its inlet and outlet pipes, allowing for independent control of each tank.

[0054] The filtration system 200 includes two parallel KKF filters 32. A filtration system adhesive transfer pump 31 is provided between the filtration system 200 and the mixing system 100 for conveying adhesive. The KKF filter 32 is a KK18 fully automatic adhesive cleaning filter with a single-sided screen.

[0055] The maturation system 300 includes four maturation tanks 33 connected in series.

[0056] In the degassing system 400, there are four degassing tanks 7 connected in parallel. Specifically, the adhesive inlet of each degassing tank 7 is connected to the degassing tank inlet pipe 22 via a pipe section. This pipe section is equipped with a degassing tank self-control valve 6, and an upstream flow meter 29 is installed to monitor the flow rate entering the degassing tank 7. Simultaneously, the adhesive outlet of each degassing tank 7 is connected to the degassing tank outlet pipe 21 via a pipe section. This pipe section is equipped with an adhesive thermometer 9 and a shut-off valve 10, with the adhesive thermometer 9 located closer to the adhesive outlet of the degassing tank 7.

[0057] The liquid level switch 8 is installed on the degassing tank 7 and can measure the liquid level inside the degassing tank 7. The liquid level information obtained can be used to control the automatic control valve 6 of the degassing tank through the control element.

[0058] The inlet end of the degassing tank inlet pipe 22 is connected to the maturation system. On the pipe between the inlet end and the parallel branch of the first degassing tank 7, a tank filter 1, a glue pump 3, a pressure transmitter 4 and a glue temperature gauge 5 are installed sequentially from upstream to downstream. The glue pump 3 is equipped with a speed switch.

[0059] Each degassing tank 7 has a gas outlet at its top, which is connected to the degassing tank exhaust pipe 23 via a pipe. The outlet of the degassing tank exhaust pipe 23 is connected to the condenser 12. The outlet of the condenser 12 is connected to the dry vacuum pump 14. The outlet of the condenser 12 is connected to the heat exchanger 18. A water tank 16 is provided between the outlet of the condenser 12 and the heat exchanger 18. The inlet of the water tank 16 is connected to the outlet of the condenser 12 via a water pipe 25. The outlet of the water tank 16 is connected to the heat exchanger 18 via the heat exchanger inlet pipe 27. A water circulation pump 17 is provided on the heat exchanger inlet pipe 27. A water thermometer 15 is provided on the water pipe 25. A temperature transmitter 19 is provided on the heat exchanger outlet pipe 37.

[0060] The condensing medium used in this embodiment is chilled water. The chilled water enters the heat exchanger 18 through the chilled water inlet pipe 26. After heat exchange, it is discharged from the heat exchanger 18 through the chilled water drain pipe 28. A chilled water regulating valve 20 is provided on the chilled water drain pipe 28. The chilled water regulating valve 20 is connected to the temperature transmitter 19. The opening degree of the chilled water regulating valve 20 can be adjusted by the temperature transmitter 19. The water temperature is adjusted by regulating the inflow and outflow of chilled water.

[0061] The dry vacuum pump 14 in this embodiment is also provided with a dry vacuum pump exhaust pipe 24, and the condenser 12 is also provided with a soft water inlet.

[0062] In this embodiment, the adhesive outlet of the degassing tank 7 is connected to the spinning adhesive filtration system 500. The spinning adhesive filtration system 500 includes two parallel KKF filters 35 and a candle filter 36. The outlet end of the degassing tank outlet pipe 21 is connected to the two parallel KKF filters 35, and a spinning adhesive filtration system adhesive delivery pump 34 is installed on the connected pipe. The two parallel KKF filters 35 are connected to the candle filter 36.

[0063] The working process of this embodiment is as follows: During normal production, the degassing system 400 maintains a constant vacuum of 0.030 bar to ensure that all degassing tanks 7 enter and exit at the same time.

[0064] To maintain a stable liquid level in the degassing tank 7, the liquid level switch 8 of the degassing tank 7 controls the flow rate of the inlet pipe 22 of the degassing tank, the flow rate controls the opening of the self-control valve 6 of the degassing tank, and the pressure transmitter 4 controls the pumping speed of the adhesive pump 3, thereby achieving stable automatic control of the liquid level in the degassing system 400.

[0065] The adhesive temperature gauge 5 and adhesive thermometer 9 monitor the temperature in real time, and the temperature difference between the inlet and outlet of the degassing tank 7 is calculated by the DCS program to monitor the vacuum system.

[0066] The dry vacuum pump 14 extracts the gas from the adhesive in the degassing tank 7. The gas passes through the degassing tank exhaust pipe 23, condenser 12, and then enters the dry vacuum pump 14, thus discharging the gas. The condensate from the condenser 12 falls into the water tank 16, and is then transported to the heat exchanger 18 for heat exchange and recycling.

[0067] Temperature transmitter 19 controls the opening and closing of valve on heat exchanger outlet pipe 37 according to the monitored temperature, and controls the circulating water after heat exchange according to the return water temperature and the temperature in condenser 12, thereby adjusting the opening of water temperature control valve and adjusting water temperature.

[0068] Chilled water enters the heat exchanger 18 through the chilled water inlet pipe 26. After heat exchange, it is discharged from the heat exchanger 18 through the chilled water drain pipe 28. A chilled water regulating valve 20 is provided on the chilled water drain pipe 28. The chilled water regulating valve 20 is connected to the temperature transmitter 19. The opening degree of the chilled water regulating valve 20 can be adjusted by the temperature transmitter 19. The water temperature is adjusted by regulating the inflow and outflow of chilled water.

[0069] Pressure gauge 11 and vacuum gauge 13 of the degassing tank are used to measure the pressure in order to monitor the vacuum level of the degassing tank 7.

[0070] After degassing, the viscose enters the spinning adhesive filtration system 500 for filtration, and then spinning can be carried out.

[0071] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" 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.

[0072] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0073] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0074] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0075] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0076] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A defoaming system for the pre-spinning treatment of viscose, characterized in that, It comprises viscose conveying unit and vacuum condensing unit; the viscose conveying unit comprises at least one defoaming barrel (7), the vacuum condensing unit comprises condenser (12), dry vacuum pump (14) and heat exchanger (18); each defoaming barrel (7) is communicated with the air inlet of the condenser (12) through defoaming barrel exhaust pipe (23), the air outlet of the condenser (12) is communicated with the dry vacuum pump (14); the water outlet of the condenser (12) is communicated with the heat exchanger (18).

2. A deaeration system for the pre-spinning treatment of viscose according to claim 1, characterized in that The water outlet of the condenser (12) is communicated with the heat exchanger (18) through the water outlet pipe (25) of the condenser (12). The outlet of the water tank (16) is communicated with the heat exchanger (18) through the heat exchanger inlet pipe (27), and the water circulating pump (17) is arranged on the heat exchanger inlet pipe (27). The water outlet of the heat exchanger (18) is communicated with the water return inlet of the condenser (12) through the heat exchanger outlet pipe (37).

3. A deaeration system for the pre-spinning treatment of viscose according to claim 2, characterized in that The water outlet pipe (25) is provided with a water temperature meter (15), and the heat exchanger outlet pipe (37) is provided with a temperature transmitter (19).

4. A deaeration system for the pre-spinning treatment of viscose according to claim 1, characterized in that The heat exchanger (18) is also provided with a condensing medium inlet and a condensing medium outlet.

5. A deaeration system for the pre-spinning treatment of viscose according to claim 1, characterized in that The defoaming barrel pressure gauge (11) is arranged on the defoaming barrel exhaust pipe (23), and the vacuum pressure gauge (13) is arranged on the pipe communicated with the dry vacuum pump (14).

6. A deaeration system for the pre-spinning treatment of viscose according to any one of claims 1 to 5, characterized in that The viscose inlet of the defoaming barrel (7) is communicated with the defoaming barrel inlet pipe (22), the viscose pump (3) is arranged on the defoaming barrel inlet pipe (22), the pressure transmitter (4) is arranged between the viscose pump (3) and the defoaming barrel (7); the viscose inlet of each defoaming barrel (7) is also provided with a defoaming barrel automatic control valve (6), and the liquid level switch (8) is arranged on each defoaming barrel (7).

7. A deaeration system for the pre-spinning treatment of viscose according to claim 6, characterized in that The viscose temperature gauge (5) is arranged on the defoaming barrel inlet pipe (22), and the viscose thermometer (9) and the cut-off valve (10) are arranged on the viscose outlet of each defoaming barrel (7).

8. A deaeration system for the pre-spinning treatment of viscose according to claim 6, characterized in that The tank filter (1) is also arranged on the defoaming barrel inlet pipe (22), and the tank filter (1) is located upstream of the viscose pump (3).

9. A deaeration system for the pre-spinning treatment of viscose according to claim 6, characterized in that The defoaming barrel (7) is a plurality of, and the plurality of defoaming barrels (7) are connected in parallel between the defoaming barrel inlet pipe (22) and the defoaming barrel outlet pipe (21).

10. A viscose pre-spinning treatment apparatus, characterized by, It comprises mixing system, filtering system and aging system in sequence, and also comprises the defoaming system and the spinning dope filtering system according to any one of claims 1-9; the viscose inlet of the defoaming barrel (7) is communicated with the aging system, and the viscose outlet of the defoaming barrel (7) is communicated with the spinning dope filtering system.

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