CN212335359U - Temperature control system for improving whiteness of tows in Lyocell spinning - Google Patents
Temperature control system for improving whiteness of tows in Lyocell spinning Download PDFInfo
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- CN212335359U CN212335359U CN202021148828.9U CN202021148828U CN212335359U CN 212335359 U CN212335359 U CN 212335359U CN 202021148828 U CN202021148828 U CN 202021148828U CN 212335359 U CN212335359 U CN 212335359U
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Abstract
The utility model provides a temperature control system for improving whiteness of tows in Lyocell spinning, a high-temperature NMMO solution raw material inlet pipe is connected with a first heat exchanger, a liquid outlet of the first heat exchanger is connected with a storage tank, a heat exchange cavity of the first heat exchanger is connected with a condensing system for exchanging heat for the first heat exchanger, a bottom liquid outlet pipe of the storage tank is connected with an NMMO solution inlet pipe of a screw machine through a chemical pump, a coil pipe for preserving heat for the storage tank is wound outside the storage tank, and the coil pipe is connected with a heat preservation circulating system; a pulp powder feeding pipe is connected to the position, close to the NMMO solution feeding pipe, on the screw machine; the temperature control device is characterized in that a plurality of relatively independent temperature control units are arranged along the conveying direction of the screw machine, a liquid outlet of the screw machine is connected with a main heat exchanger used for cooling and preserving heat of mixed liquid, a temperature adjusting system is connected onto the main heat exchanger, and an outlet of the main heat exchanger is connected with a slurry pump.
Description
Technical Field
The utility model belongs to chemical fiber spinning equipment field especially relates to a temperature control system who improves silk bundle whiteness in Lyocell spinning.
Background
The whiteness of the wood pulp used for 4-methylmorpholine-N-oxide (NMMO) -cellulose solution spinning (Lyocell) is generally over 93 percent, the NMMO is colorless liquid, and the whiteness of the spun yarn is very low if the temperature is not well controlled in the preparation process of the spinning solution, so that the general requirements of the textile industry cannot be met. The utility model discloses it provides exactly to the temperature control problem in the screw rod method slurrying.
The solvent required by the preparation of the Lyocell fiber spinning solution by the screw method is 4-methylmorpholine-N-oxide (NMMO for short) hydrate with the mass fraction of more than 87%, the solvent is solid at normal temperature, the solvent is prepared by evaporating water from low-concentration NMMO during production, the temperature is generally higher than 110 ℃ during preparation, the NMMO discolors quickly when the solvent is stored at the temperature, the color of the prepared spinning solution is greatly influenced, and therefore the temperature and the storage time of the solvent need to be reduced as soon as possible so as to reduce the color change degree of the NMMO.
When NMMO and wood pulp powder are mixed and dissolved in a screw, the dissolving speed can be accelerated at a proper temperature, but the stirring (shearing) of the screw can increase the temperature of a substance mixture in the dissolving process, the wood pulp can be decomposed and discolored at an excessively high temperature, the color of the prepared spinning solution is greatly influenced, and therefore, the temperature of a cavity of the screw also needs to be controlled.
When the mixture becomes the spinning solution and is extruded out of the screw, the temperature of the mixture is very high, and the mixture needs to be quickly cooled to a temperature suitable for spinning and then is conveyed to a spinning process so as to reduce the discoloration degree of the spinning solution.
SUMMERY OF THE UTILITY MODEL
In order to solve the technical problems, the utility model provides a temperature control system for improving the whiteness of tows in Lyocell spinning, which can control the temperature of NMMO in the spinning solution, thereby ensuring that the NMMO is always maintained at a set temperature and ensuring the whiteness of the spinning to a certain extent; in addition, the control system can control the temperature of the spinning solution, so that the spinning solution is always kept at the set temperature, and finally the whiteness of the spinning is guaranteed.
In order to realize the technical characteristics, the purpose of the utility model is realized as follows: a temperature control system for improving whiteness of tows in Lyocell spinning comprises a high-temperature NMMO solution raw material inlet pipe, wherein the high-temperature NMMO solution raw material inlet pipe is connected with a first heat exchanger, a liquid outlet of the first heat exchanger is connected with a storage tank, a heat exchange cavity of the first heat exchanger is connected with a condensing system for exchanging heat of the first heat exchanger, a liquid outlet pipe at the bottom of the storage tank is connected with an NMMO solution inlet pipe of a screw machine through a chemical pump, a coil pipe for preserving heat of the storage tank is wound outside the storage tank, and the coil pipe is connected with a heat preservation circulating system; a pulp powder feeding pipe is connected to the position, close to the NMMO solution feeding pipe, on the screw machine; a plurality of relatively independent temperature control units are arranged along the conveying direction of the screw machine, and each temperature control unit is respectively provided with a cooling water channel and an electric heating element; the liquid outlet of the screw machine is connected with a main heat exchanger used for cooling and preserving the mixed liquid, the main heat exchanger is connected with a temperature adjusting system, and the outlet of the main heat exchanger is connected with a slurry pump.
The condensation system comprises a first high-level water tank, a water outlet of the first high-level water tank is connected with a second heat exchanger through a first water pump, a water outlet of the second heat exchanger is communicated with a heat exchange cavity of the first heat exchanger, and an outlet of the heat exchange cavity of the first heat exchanger is communicated with the first high-level water tank through a return pipe;
high temperature NMMO solution raw materials advances to link to each other the intercommunication through violently managing between pipe and the storage tank, violently manage on the pipe to be located and install first valve between first heat exchanger and the storage tank.
The first high-level water tank is connected with a first purified water replenishing pipe; the first purified water replenishing pipe is provided with a first ball float valve for controlling the water level of the first high-level water tank, the heat exchange cavity inlet of the second heat exchanger is connected with the external cooling water inlet pipe, the external cooling water inlet pipe is provided with a first regulating valve, and the heat exchange cavity outlet of the second heat exchanger is connected with the external cooling water outlet pipe.
The heat preservation circulating system comprises a second high-level water tank, and a second purified water replenishing pipe is connected to the second high-level water tank; a second ball float valve for controlling the water level of a second high-level water tank is arranged on the second purified water replenishing pipe, a water outlet of the second high-level water tank is connected with a third heat exchanger through a second water pump, a water outlet of the third heat exchanger is connected with a water inlet of a coil pipe, and a water outlet of the coil pipe is connected with the second high-level water tank;
a first steam inlet pipe and a first condensed water outlet pipe are communicated with the heat exchange cavity of the third heat exchanger, and a second regulating valve is mounted on the first steam inlet pipe;
a first temperature sensor is arranged at the position of a liquid outlet of the first heat exchanger, and a second temperature sensor is arranged on the storage tank;
and a third temperature sensor is arranged at the liquid outlet of a third heat exchanger of the heat preservation circulating system.
The cooling water channel of each temperature control unit is connected with a water inlet pipe, each water inlet pipe is provided with an electromagnetic valve, and all the water inlet pipes are connected with the water outlet of the first water tank through a third water pump; the water outlet of each cooling water channel is connected with a main return pipe, the main return pipe is connected with a fourth heat exchanger, and the outlet of the fourth heat exchanger is communicated with a first water tank;
a third purified water replenishing pipe is connected to the first water tank, and a third ball float valve for controlling the water level of the first water tank is mounted on the third purified water replenishing pipe;
a water inlet pipe of a heat exchange cavity of the fourth heat exchanger is connected with a first public cooling water inlet pipe, and a water outlet pipe of the heat exchange cavity is connected with a first public cooling water return pipe;
a fourth temperature sensor is respectively arranged on each temperature control unit;
and a fifth temperature sensor is arranged at the outlet of the main heat exchanger.
The temperature adjusting system comprises a second water tank, a water outlet of the second water tank is connected with a water inlet of a fifth heat exchanger, a water outlet of the fifth heat exchanger is connected with a water inlet of a sixth heat exchanger, a water outlet of the sixth heat exchanger is connected with a water inlet of the main heat exchanger through a fourth water pump, and a water outlet of the main heat exchanger is connected with a water inlet of the fifth heat exchanger.
A fourth purified water replenishing pipe is connected to the second water tank, and a fourth ball float valve for controlling the water level of the second water tank is mounted on the fourth purified water replenishing pipe;
and a water inlet of a heat exchange cavity of the fifth heat exchanger is connected with a fifth purified water replenishing pipe, a water outlet of the heat exchange cavity of the fifth heat exchanger is connected with a second public cooling water return pipe, and a third regulating valve is installed on the fifth purified water replenishing pipe.
And an inlet of a heat exchange cavity of the sixth heat exchanger is connected with a second steam inlet pipe, an outlet of the heat exchange cavity is communicated with a second condensed water outlet pipe, and a fourth regulating valve is installed on the second steam inlet pipe.
The utility model discloses there is following beneficial effect:
1. by adopting the temperature control system, the temperature in the key process in the spinning solution preparation process can be effectively controlled and adjusted, so that the spinning requirement can be met, and the requirement for improving the whiteness of the spinning tows can be met. In the specific working process, the condensing system is used for effectively cooling the high-temperature NMMO solution, and the heat preservation circulation system is used for preserving the heat of the cooled NMMO solution to keep the NMMO solution at a set temperature so as to meet the requirement of subsequent process flows.
2. The condensing system can control the temperature of NMMO in the spinning solution, thereby ensuring that the NMMO is always maintained at a set temperature and finally ensuring the whiteness of the spinning.
3. Through the first valve, the NMMO solution in the first heat exchanger can be completely put into the storage tank after the solution is conveyed, so that the NMMO solution is prevented from remaining in the first heat exchanger.
4. The storage tank can be insulated through the heat-insulation circulating system, and the temperature of the NMMO solution entering the screw machine is guaranteed to be the set temperature.
5. Through the temperature that first temperature sensor can be used for detecting the NMMO solution after the heat transfer, when the temperature reduction does not reach the settlement temperature, through the aperture of the first governing valve of feedback control, and then control the heat transfer effect of second heat exchanger.
6. Be used for detecting the temperature of coil pipe water inlet through third temperature sensor, and then guarantee the heat preservation temperature of setting for, third temperature sensor can carry out feedback control to the second governing valve moreover, and then guarantees the supply of steam to the temperature of water after guaranteeing the heat transfer.
7. By adopting the temperature control unit, the temperature of each unit can be accurately controlled, and the unit can be conveyed along the set temperature gradient.
Drawings
The present invention will be further explained with reference to the drawings and examples.
Fig. 1 is a system diagram of the present invention.
Fig. 2 is a system diagram of the NMMO solution preparation of fig. 1 according to the present invention.
FIG. 3 is a schematic diagram of a system for preparing dope according to FIG. 1.
In the figure: the system comprises a first heat exchanger 1, a first temperature sensor 2, a first valve 3, a storage tank 4, a second temperature sensor 5, a coil 6, a chemical pump 7, a second water pump 8, a third heat exchanger 9, a third temperature sensor 10, a second regulating valve 11, a second high-level water tank 12, a first high-level water tank 13, a first regulating valve 14, a first water pump 15, a second heat exchanger 16, a second ball float valve 17, a first ball float valve 18, a high-temperature NMMO solution raw material inlet pipe 19, a first purified water replenishing pipe 20, an external cooling water inlet pipe 21, an external cooling water outlet pipe 22, a second purified water replenishing pipe 23, a first steam inlet pipe 24, a first outlet pipe condensed water 25, a screw machine 26, a fourth heat exchanger 27, a first water tank 28, a third ball float valve 29, a third water pump 30, an electromagnetic valve 31, a fourth temperature sensor 32, a second water tank 33, a fourth ball float valve 34, a fifth temperature sensor 35, a main heat exchanger 36, a first temperature sensor 10, A third regulating valve 37, a fifth heat exchanger 38, a fourth regulating valve 39, a sixth heat exchanger 40, a fourth water pump 41, a slurry pump 42, an NMMO solution feed pipe 43, a pulp powder feed pipe 44, a first common cooling water return pipe 45, a first common cooling water inlet pipe 46, a third purified water replenishing pipe 47, a fourth purified water replenishing pipe 48, a second common cooling water return pipe 49, a second condensed water outlet pipe 50 and a second steam inlet pipe 51.
Detailed Description
The following describes embodiments of the present invention with reference to the accompanying drawings.
Example 1
Referring to fig. 1-3, a temperature control system for improving whiteness of tows in Lyocell spinning comprises a high-temperature NMMO solution raw material inlet pipe 19, wherein the high-temperature NMMO solution raw material inlet pipe 19 is connected with a first heat exchanger 1, a liquid outlet of the first heat exchanger 1 is connected with a storage tank 4, a heat exchange cavity of the first heat exchanger 1 is connected with a condensing system for exchanging heat of the first heat exchanger 1, a liquid outlet pipe at the bottom of the storage tank 4 is connected with an NMMO solution inlet pipe 43 of a screw machine 26 through a chemical pump 7, a coil 6 for preserving heat of the storage tank 4 is wound outside the storage tank 4, and the coil 6 is connected with a heat preservation circulation system; a pulp powder feeding pipe 44 is connected to the screw machine 26 and is close to the NMMO solution feeding pipe 43; a plurality of relatively independent temperature control units are arranged along the conveying direction of the screw machine 26, and each temperature control unit is respectively provided with a cooling water channel and an electric heating element; a liquid outlet of the screw machine 26 is connected with a main heat exchanger 36 for cooling and preserving the mixed liquid, a temperature adjusting system is connected to the main heat exchanger 36, and an outlet of the main heat exchanger 36 is connected with a slurry pump 42. By adopting the temperature control system, the temperature in the key process in the spinning solution preparation process can be effectively controlled and adjusted, so that the spinning requirement can be met, and the requirement for improving the whiteness of the spinning tows can be met. In the specific working process, the condensing system is used for effectively cooling the high-temperature NMMO solution, and the heat preservation circulation system is used for preserving the heat of the cooled NMMO solution to keep the NMMO solution at a set temperature so as to meet the requirement of subsequent process flows.
Further, the condensing system comprises a first high-level water tank 13, a water outlet of the first high-level water tank 13 is connected with a second heat exchanger 16 through a first water pump 15, a water outlet of the second heat exchanger 16 is communicated with a heat exchange cavity of the first heat exchanger 1, and an outlet of the heat exchange cavity of the first heat exchanger 1 is communicated with the first high-level water tank 13 through a return pipe; the control system can control the temperature of the NMMO in the spinning solution, so that the temperature of the NMMO in the spinning solution is always kept at the set temperature, and finally the whiteness of the spinning is guaranteed. In the specific use process, the condensation system is used for effectively cooling the high-temperature NMMO solution, and the heat preservation circulation system is used for preserving the heat of the cooled NMMO solution to keep the NMMO solution at a set temperature so as to meet the requirement of subsequent process flows.
Further, high temperature NMMO solution raw materials advances and links to each other the intercommunication through violently managing between pipe 19 and the storage tank 4, violently manage and go up to be located and install first valve 3 between first heat exchanger 1 and the storage tank 4. The first valve 3 can ensure that the NMMO solution inside the first heat exchanger 1 is completely put into the storage tank 4 after the solution delivery is completed, so that the NMMO solution is prevented from remaining inside the first heat exchanger 1.
Further, a first purified water replenishing pipe 20 is connected to the first high-level water tank 13; the first purified water replenishing pipe 20 is provided with a first ball float valve 18 for controlling the water level of the first high-level water tank 13, the inlet of the heat exchange cavity of the second heat exchanger 16 is connected with an external cooling water inlet pipe 21, the external cooling water inlet pipe 21 is provided with a first regulating valve 14, and the outlet of the heat exchange cavity of the second heat exchanger 16 is connected with an external cooling water outlet pipe 22. The first regulating valve 14 can be used for controlling the heat exchange effect of the second heat exchanger 16.
Further, the heat preservation circulating system comprises a second high-level water tank 12, and a second purified water replenishing pipe 23 is connected to the second high-level water tank 12; a second ball float valve 17 for controlling the water level of a second high-level water tank 12 is installed on the second purified water replenishing pipe 23, the water outlet of the second high-level water tank 12 is connected with a third heat exchanger 9 through a second water pump 8, the water outlet of the third heat exchanger 9 is connected with the water inlet of a coil pipe 6, and the water outlet of the coil pipe 6 is connected with the second high-level water tank 12; through foretell heat preservation circulation system can keep warm to storage tank 4, and then guaranteed that the temperature of the inside NMMO solution of entering into screw machine is the settlement temperature.
Further, a first steam inlet pipe 24 and a first condensed water outlet pipe 25 are communicated with a heat exchange cavity of the third heat exchanger 9, and a second regulating valve 11 is installed on the first steam inlet pipe 24; through the second regulating valve 11 for controlling the temperature of the introduced steam.
Further, a first temperature sensor 2 is installed at a liquid outlet of the first heat exchanger 1, and a second temperature sensor 5 is installed on the storage tank 4; the temperature of the NMMO solution after heat exchange can be detected by the first temperature sensor 2, and when the temperature is reduced and does not reach the set temperature, the opening degree of the first regulating valve 14 is controlled by feedback, so that the heat exchange effect of the second heat exchanger 16 is controlled.
Further, a third temperature sensor 10 is installed at a liquid outlet of a third heat exchanger 9 of the heat preservation circulating system. Be used for detecting the temperature of 6 water inlets of coil pipe through third temperature sensor 10, and then guarantee the heat preservation temperature of setting for, third temperature sensor 10 can carry out feedback control to second governing valve 11 moreover, and then guarantees the supply of steam to the temperature of water after guaranteeing the heat transfer.
Furthermore, the cooling water channel of each temperature control unit is connected with a water inlet pipe, each water inlet pipe is provided with an electromagnetic valve 31, and all the water inlet pipes are connected with the water outlet of the first water tank 28 through a third water pump 30; the water outlet of each cooling water channel is connected with a main return pipe, the main return pipe is connected with a fourth heat exchanger 27, and the outlet of the fourth heat exchanger 27 is communicated with a first water tank 28; by adopting the temperature control unit, the temperature of each unit can be accurately controlled, and the unit can be conveyed along the set temperature gradient.
Further, a third purified water replenishing pipe 47 is connected to the first water tank 28, and a third ball float valve 29 for controlling the water level of the first water tank 28 is installed on the third purified water replenishing pipe 47; automatic water replenishing can be realized through the water replenishing system.
Further, a water inlet pipe of a heat exchange cavity of the fourth heat exchanger 27 is connected with a first common cooling water inlet pipe 46, and a water outlet pipe of the heat exchange cavity is connected with a first common cooling water return pipe 45; the heat exchange system can be used for cooling the fourth heat exchanger 27.
Further, a fourth temperature sensor 32 is respectively mounted on each temperature control unit; the fourth temperature sensor 32 can be used to detect the temperature of each individual temperature control unit and adjust the temperature of each unit by feedback to operate at the set temperature.
Further, a fifth temperature sensor 35 is installed at an outlet position of the main heat exchanger 36. The fifth temperature sensor 35 is used for detecting the temperature of the outlet of the main heat exchanger 36, and then the temperature is adjusted and controlled through feedback adjustment.
Further, the temperature adjusting system comprises a second water tank 33, a water outlet of the second water tank 33 is connected with a water inlet of a fifth heat exchanger 38, a water outlet of the fifth heat exchanger 38 is connected with a water inlet of a sixth heat exchanger 40, a water outlet of the sixth heat exchanger 40 is connected with a water inlet of a main heat exchanger 36 through a fourth water pump 41, and a water outlet of the main heat exchanger 36 is connected with a water inlet of the fifth heat exchanger 38. The temperature regulation system described above can be used to control the temperature of the primary heat exchanger 36. Which on the one hand enables an effective cooling of the main heat exchanger 36 and on the other hand enables a heat preservation thereof.
Further, a fourth purified water replenishing pipe 48 is connected to the second water tank 33, and a fourth ball float valve 34 for controlling the water level of the second water tank 33 is installed on the fourth purified water replenishing pipe 48; automatic water replenishing can be realized through the water replenishing system.
Further, a water inlet of the heat exchange cavity of the fifth heat exchanger 38 is connected to a fifth purified water replenishing pipe 52, a water outlet of the heat exchange cavity is connected to a second common cooling water return pipe 49, and a third regulating valve 37 is installed on the fifth purified water replenishing pipe 52.
Further, an inlet of a heat exchange cavity of the sixth heat exchanger 40 is connected to a second steam inlet pipe 51, an outlet of the heat exchange cavity is communicated with a second condensed water outlet pipe 50, and a fourth regulating valve 39 is installed on the second steam inlet pipe 51. The temperature rise can be achieved by the sixth heat exchanger 40 described above.
Example 2:
the preparation method of the spinning solution of the temperature control system for improving the whiteness of the tows in the Lyocell spinning comprises the following steps:
the method comprises the following steps: when the NMMO high-temperature heat exchanger works normally, the first valve 3 is closed, and the high-temperature concentrated NMMO enters the storage tank 4 for storage and use after being cooled by the tube pass of the first heat exchanger 1; when the system is stopped, the first valve 3 is opened, and the NMMO in the first heat exchanger 1 is emptied, so that the NMMO is prevented from being condensed and blocked;
step two: the first heat exchanger 1 is subjected to heat exchange and cooling through a condensing system, so that the high-temperature NMMO solution raw material is cooled;
step three: after the temperature reduction is finished, the NMMO solution stored in the storage tank 4 is subjected to heat preservation through a heat preservation circulating system;
step four: the NMMO solution in the storage tank 4 is pumped to the screw machine 26 through the chemical pump 7, and pulp powder is also fed into the screw machine 26;
step five: according to the temperature gradient required in the dissolving process of the screw machine 26, controlling each relatively independent temperature control unit to enable different sections of the screw machine 26 to meet different temperature requirements, automatically controlling each section according to the signal of the fourth temperature sensor 32 and a process set value, turning off a power supply when the temperature is high, and turning on the electromagnetic valve 31 to introduce cooling water for cooling; when the temperature is low, the electromagnetic valve 31 is closed to cut off the cooling water, and the power is on for heating;
step six: the temperature of the main heat exchanger 36 is adjusted through a temperature adjusting system, and then the temperature of the prepared spinning solution is adjusted and controlled, so that the temperature requirement of spinning is met.
The utility model discloses a working process and principle do:
referring to fig. 2: during normal work, first valve 3 is closed, and the concentrated NMMO of process high temperature gets into storage tank 4 after the tube side cooling of first heat exchanger 1 and stores, uses. When the system is stopped, the first valve 3 is opened, and the NMMO in the first heat exchanger 1 is emptied, so that the NMMO is prevented from being condensed and blocked.
The first high-level water tank 13 is arranged at a high level, purified water is injected into the first high-level water tank 13 through a first ball float valve 18, the first ball float valve 18 maintains the liquid level, the purified water is input into the shell side of a second heat exchanger 16 from the first high-level water tank 13 by a first water pump 15 to be cooled, then is input into the shell side of the first heat exchanger 1 to cool NMMO in the tube side, and then the purified water returns to the first high-level water tank 13;
the tube side of the second heat exchanger 16 is connected to the cooling water of the utility, and the inlet end is provided with a first regulating valve 14, the opening of which is automatically regulated according to the signal of the first temperature sensor 2 and the process set value.
The purpose of setting up two-stage heat transfer is that the heat transfer interface temperature difference is too big in preventing first heat exchanger 1, and the NMMO condenses at the heat transfer interface.
The second heat exchanger 16 is convenient to overhaul and remove scale by introducing external cooling water into the tube side.
The NMMO needs to be kept warm in the storage tank 4. The second high-level water tank 12 is arranged at a high level, purified water is injected into the second high-level water tank 12 through the second ball float valve 17, the second ball float valve 17 maintains the liquid level, and the second water pump 8 inputs the purified water into the tube side of the third heat exchanger 9 from the second high-level water tank 12, then inputs the purified water into the coil 6 in the storage tank 4 and then returns to the second high-level water tank 12 in work. The shell side of the third heat exchanger 9 is connected with steam and a drain valve, a second regulating valve 11 is arranged at a steam inlet, and the opening degree of the second regulating valve is automatically regulated according to the signal of the third temperature sensor 10 and a process set value.
Referring to fig. 3: the temperature of the screw machine 26 is controlled in multiple stages, and the principle of each stage is consistent, but the temperature is different. Each section of cavity is internally provided with a cooling water channel and an electric heating element. The cooling water passage is formed by adding the first water tank 28 to purified water through a third ball float valve 29, maintaining the liquid level height of the third ball float valve 29, inputting the purified water into a cooling water channel of the screw machine 26 through a third water pump 30 and an electromagnetic valve 31, inputting the purified water into a fourth heat exchanger 27 through a water return pipe, cooling the purified water, and returning the cooled purified water to the first water tank 28. The heating element is electrified with 220V alternating current. When the temperature control device works, all the sections are automatically controlled according to the signal of the fourth temperature sensor 32 and a process set value, when the temperature is high, the power supply is closed, and the electromagnetic valve 31 is opened to be filled with cooling water for cooling; when the temperature is low, the electromagnetic valve 31 is closed to cut off the cooling water, and the electricity is conducted for heating.
The dope is rapidly cooled after exiting the screw machine 26 through the tube side of the main heat exchanger 36. Purified water is added into the second water tank 33 through the fourth ball float valve 34, the second water tank 33 is arranged at a high position, and the fourth ball float valve 34 maintains the liquid level; the cooling water path is that the fourth water pump 41 injects cooling water into the shell side of the main heat exchanger 36, and the cooling water enters the shell side of the fifth heat exchanger 38 and the tube side of the sixth heat exchanger 40 after coming out, and returns to the fourth water pump 41. The tube pass of the fifth heat exchanger 38 is connected with common cooling water, and the inlet of the fifth heat exchanger is provided with a third regulating valve 37; the shell side of the sixth heat exchanger 40 is connected with steam and a drain valve, and the inlet of the steam engine is provided with a fourth regulating valve 39. When the temperature-reducing device works, the temperature-reducing device is automatically controlled according to a signal of the fifth temperature sensor 35 and a process set value, when the temperature needs to be reduced, the fourth regulating valve 39 is closed, the third regulating valve 37 is opened, and the opening degree is regulated according to the difference between the actually measured temperature duty and the process set value; when the vehicle is started or the temperature needs to be raised, the third regulating valve 37 is closed, and the fourth regulating valve 39 is opened for heating.
The fourth heat exchanger 27 and the fifth heat exchanger 38 are selected to be introduced with external cooling water on the tube side, so that the maintenance and the descaling are convenient.
To accelerate the heat transfer of the spinning dope, a static mixer is provided in the tube side of the main heat exchanger 36.
Claims (9)
1. A temperature control system for improving whiteness of tows in Lyocell spinning is characterized in that: the system comprises a high-temperature NMMO solution raw material inlet pipe (19), wherein the high-temperature NMMO solution raw material inlet pipe (19) is connected with a first heat exchanger (1), a liquid outlet of the first heat exchanger (1) is connected with a storage tank (4), a heat exchange cavity of the first heat exchanger (1) is connected with a condensing system for exchanging heat of the first heat exchanger, a liquid outlet pipe at the bottom of the storage tank (4) is connected with an NMMO solution inlet pipe (43) of a screw machine (26) through a chemical pump (7), a coil pipe (6) for preserving heat of the storage tank (4) is wound outside the storage tank (4), and the coil pipe (6) is connected with a heat preservation circulating system; a pulp powder feeding pipe (44) is connected to the position, close to the NMMO solution feeding pipe (43), on the screw machine (26); a plurality of relatively independent temperature control units are arranged along the conveying direction of the screw machine (26), and each temperature control unit is respectively provided with a cooling water channel and an electric heating element; the liquid outlet of the screw machine (26) is connected with a main heat exchanger (36) used for cooling and preserving the mixed liquid, a temperature adjusting system is connected to the main heat exchanger (36), and the outlet of the main heat exchanger (36) is connected with a slurry pump (42).
2. The temperature control system for improving the whiteness of the tows in the Lyocell spinning according to claim 1, which is characterized in that: the condensation system comprises a first high-level water tank (13), a water outlet of the first high-level water tank (13) is connected with a second heat exchanger (16) through a first water pump (15), a water outlet of the second heat exchanger (16) is communicated with a heat exchange cavity of the first heat exchanger (1), and an outlet of the heat exchange cavity of the first heat exchanger (1) is communicated with the first high-level water tank (13) through a return pipe;
high temperature NMMO solution raw materials advances to link to each other the intercommunication through violently managing between pipe (19) and storage tank (4), violently manage and go up to be located and install first valve (3) between first heat exchanger (1) and storage tank (4).
3. The temperature control system for improving the whiteness of the tows in the Lyocell spinning according to claim 2, which is characterized in that: the first high-level water tank (13) is connected with a first purified water replenishing pipe (20); install first ball-cock assembly (18) that are used for controlling first high-order basin (13) water level on first purified water moisturizing pipe (20), the heat transfer cavity import and the external cooling water of second heat exchanger (16) advance pipe (21) and link to each other, install first governing valve (14) on the external cooling water advances pipe (21), the heat transfer cavity export and the external cooling water exit tube (22) of second heat exchanger (16) link to each other.
4. The temperature control system for improving the whiteness of the tows in the Lyocell spinning according to claim 1, which is characterized in that: the heat preservation circulating system comprises a second high-level water tank (12), and a second purified water replenishing pipe (23) is connected to the second high-level water tank (12); a second ball float valve (17) for controlling the water level of a second high-level water tank (12) is installed on the second purified water replenishing pipe (23), a water outlet of the second high-level water tank (12) is connected with a third heat exchanger (9) through a second water pump (8), a water outlet of the third heat exchanger (9) is connected with a water inlet of a coil pipe (6), and a water outlet of the coil pipe (6) is connected with the second high-level water tank (12);
a first steam inlet pipe (24) and a first condensate outlet pipe (25) are communicated with a heat exchange cavity of the third heat exchanger (9), and a second regulating valve (11) is installed on the first steam inlet pipe (24).
5. The temperature control system for improving the whiteness of the tows in the Lyocell spinning according to claim 1, which is characterized in that: a first temperature sensor (2) is arranged at the liquid outlet of the first heat exchanger (1), and a second temperature sensor (5) is arranged on the storage tank (4);
and a third temperature sensor (10) is arranged at the liquid outlet of a third heat exchanger (9) of the heat-preservation circulating system.
6. The temperature control system for improving the whiteness of the tows in the Lyocell spinning according to claim 1, which is characterized in that: the cooling water channel of each temperature control unit is connected with a water inlet pipe, each water inlet pipe is provided with an electromagnetic valve (31), and all the water inlet pipes are connected with the water outlet of the first water tank (28) through a third water pump (30); the water outlet of each cooling water channel is connected with a main return pipe, the main return pipe is connected with a fourth heat exchanger (27), and the outlet of the fourth heat exchanger (27) is communicated with a first water tank (28);
a third purified water replenishing pipe (47) is connected to the first water tank (28), and a third ball float valve (29) for controlling the water level of the first water tank (28) is installed on the third purified water replenishing pipe (47);
a water inlet pipe of a heat exchange cavity of the fourth heat exchanger (27) is connected with a first common cooling water inlet pipe (46), and a water outlet pipe of the heat exchange cavity is connected with a first common cooling water return pipe (45);
a fourth temperature sensor (32) is respectively arranged on each temperature control unit;
and a fifth temperature sensor (35) is arranged at the outlet position of the main heat exchanger (36).
7. The temperature control system for improving the whiteness of the tows in the Lyocell spinning according to claim 1, which is characterized in that: the temperature adjusting system comprises a second water tank (33), a water outlet of the second water tank (33) is connected with a water inlet of a fifth heat exchanger (38), a water outlet of the fifth heat exchanger (38) is connected with a water inlet of a sixth heat exchanger (40), a water outlet of the sixth heat exchanger (40) is connected with a water inlet of a main heat exchanger (36) through a fourth water pump (41), and a water outlet of the main heat exchanger (36) is connected with a water inlet of the fifth heat exchanger (38).
8. The temperature control system for improving the whiteness of the tows in the Lyocell spinning according to claim 7, is characterized in that: a fourth purified water replenishing pipe (48) is connected to the second water tank (33), and a fourth ball float valve (34) for controlling the water level of the second water tank (33) is mounted on the fourth purified water replenishing pipe (48);
and a water inlet of a heat exchange cavity of the fifth heat exchanger (38) is connected with a fifth purified water replenishing pipe (52), a water outlet of the heat exchange cavity of the fifth heat exchanger is connected with a second public cooling water return pipe (49), and a third regulating valve (37) is installed on the fifth purified water replenishing pipe (52).
9. The temperature control system for improving the whiteness of the tows in the Lyocell spinning according to claim 7, is characterized in that: and an inlet of a heat exchange cavity of the sixth heat exchanger (40) is connected with a second steam inlet pipe (51), an outlet of the heat exchange cavity is communicated with a second condensed water outlet pipe (50), and a fourth regulating valve (39) is installed on the second steam inlet pipe (51).
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| Application Number | Priority Date | Filing Date | Title |
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| CN202021148828.9U CN212335359U (en) | 2020-06-19 | 2020-06-19 | Temperature control system for improving whiteness of tows in Lyocell spinning |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202021148828.9U CN212335359U (en) | 2020-06-19 | 2020-06-19 | Temperature control system for improving whiteness of tows in Lyocell spinning |
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