Gas phase heat medium spare heating device for melt direct spinning chemical fiber

Abstract

The utility model provides a kind of gas phase heat medium spare heating device for melt direct spinning chemical fiber, it relates to chemical fiber production equipment technical field, the gas phase heat medium spare heating device for melt direct spinning chemical fiber, including heat medium evaporator tank body, composite electric heating assembly, three-dimensional temperature detection module, intelligent control module and double redundancy power supply module;Composite electric heating assembly is fixedly installed in heat medium evaporator tank body and is completely immersed in liquid phase heat medium;The detection end of three-dimensional temperature detection module is inserted into heat medium evaporator tank body, for collecting global temperature signal;Intelligent control module is electrically connected with composite electric heating assembly, three-dimensional temperature detection module respectively, controls heating state;Double redundancy power supply module provides electric power for each component, the heating device can quickly heat when steam heating fails, and also has heating uniform, temperature control precision is high and equipment reliability is good, can effectively avoid production line to stop, applicable to melt direct spinning chemical fiber gas phase heat medium heating system.

Description

Technical Field

[0001] This utility model relates to the technical field of chemical fiber production equipment, specifically a backup heating device for gas phase heat medium used in melt direct spinning of chemical fibers. Background Technology

[0002] In the melt-spinning process of chemical fiber production, the fiber box needs to maintain a stable high-temperature environment to ensure the smooth operation of the melt spinning process. Currently, the mainstream heating method uses gaseous heat transfer medium biphenyl-diphenyl ether as the heat transfer medium. The liquid heat transfer medium biphenyl-diphenyl ether is stored in the heat transfer medium evaporator tank. The tank is equipped with tubes, and the liquid heat transfer medium hydrogenated terphenyl is introduced into the tubes. The liquid heat transfer medium hydrogenated terphenyl in the tubes is heated by high-temperature steam, and then the liquid heat transfer medium hydrogenated terphenyl transfers heat to the liquid biphenyl-diphenyl ether in the tank, causing it to evaporate into a gaseous phase and be transported to the chemical fiber box, thus achieving heat supply.

[0003] However, the aforementioned heating system is highly dependent on the stability of high-temperature steam. In actual production, steam boilers are susceptible to fluctuations in fuel supply, equipment malfunctions, and abnormal pressure control, leading to unstable output steam temperature or pressure. This, in turn, causes the liquid-phase heat transfer medium, hydrogenated terphenyl, to lose heat and its temperature to drop within the tubes. When the liquid-phase heat transfer medium cannot provide sufficient heat, the biphenyl-diphenyl ether in the heat transfer medium evaporator tank cannot maintain its gaseous state, causing a sudden drop in the temperature of the chemical fiber box, ultimately triggering a production line shutdown. Restarting the production line not only consumes a significant amount of time and energy but also results in the scrapping of semi-finished products, severely impacting production efficiency and economic benefits. Therefore, a backup heating device is urgently needed to promptly replenish heat when the liquid-phase heat transfer medium fails, ensuring a stable supply of the gaseous heat transfer medium. Utility Model Content

[0004] The purpose of this invention is to provide a backup heating device for gas-phase heat medium used in melt direct spinning of chemical fibers, which aims to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: the gas phase heat medium backup heating device for melt direct spinning of chemical fibers includes a heat medium evaporator tank, a composite electric heating component, a three-dimensional temperature detection module, an intelligent control module, and a dual redundant power supply module; The heat medium evaporator tank contains a liquid heat medium, biphenyl-biphenyl ether. The composite electric heating component is fixedly installed inside the heat medium evaporator tank and is completely immersed in the liquid heat medium. The detection end of the three-dimensional temperature detection module extends into the heat medium evaporator tank to collect temperature signals across the entire range. The intelligent control module is electrically connected to the composite electric heating component and the three-dimensional temperature detection module respectively to control the heating state; The dual redundant power supply module provides power to each component.

[0006] Preferably, the composite electric heating assembly includes a circumferential heating unit and a central heating unit. The circumferential heating unit includes multiple finned electric heating tubes that are evenly distributed circumferentially along the inner wall of the heat medium evaporator tank. The central heating unit is a columnar electric heater fixed at the axial position of the heat medium evaporator tank, and its outer wall is provided with radial heat dissipation fins.

[0007] Preferably, both the finned electric heating tube and the columnar electric heater are connected to the heat medium evaporator tank by flanges. The connection between the flange and the heat medium evaporator tank is provided with a double-layer sealing structure, wherein the inner layer is a metal spiral wound gasket and the outer layer is a silicone rubber sealing ring. A ceramic heat insulation sleeve is fitted on the outside of the flange.

[0008] Preferably, the three-dimensional temperature detection module includes five high-precision platinum resistance temperature sensors, four of which are used to measure the temperature of the liquid-phase heat transfer medium biphenyl-diphenyl ether, and the fifth is used to measure the temperature of the gas-phase heat transfer medium biphenyl-diphenyl ether. The signal output terminals of the platinum resistance temperature sensors are connected to the intelligent control module via twisted-pair shielded cables.

[0009] Preferably, the intelligent control module includes a PLC controller, a touch screen, and a power regulation module.

[0010] Preferably, the dual-redundant power supply module includes a main power supply circuit and a backup power supply circuit, and the main power supply circuit and the backup power supply circuit are connected by an ATS automatic transfer switch.

[0011] Preferably, it also includes a multi-level alarm module and a heat medium circulation auxiliary unit. The multi-level alarm module includes a local audible and visual alarm and a remote SMS alarm, and is linked to the PLC controller for shutdown. The heat medium circulation auxiliary unit is a miniature magnetic pump installed at the bottom of the tank.

[0012] The beneficial effects of this utility model are: This heating device can quickly replenish heat when steam heating fails, and it also features uniform heating, high temperature control accuracy, and good equipment reliability. It can effectively prevent production line shutdowns and is suitable for melt-spun chemical fiber gas phase heat medium heating systems. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the heat transfer medium evaporator tank.

[0014] Figure 2 This is a schematic diagram of the internal tubes of a heat transfer medium evaporator tank.

[0015] Figure 3 This is a schematic diagram showing the distribution of the composite electric heating components inside the heat transfer medium evaporator tank.

[0016] In the diagram: 1. Evaporator tank; 2. Tubes; 3. Finned electric heater; 4. Columnar electric heater; 5. Inspection port; 6. Platinum resistance temperature sensor; 7. Miniature magnetic pump. Detailed Implementation

[0017] The specific embodiments of this utility model will be further described below with reference to the accompanying drawings.

[0018] like Figure 1-3 As shown, a standby heating device for gas-phase heat medium used in melt direct spinning of chemical fibers includes a heat medium evaporator tank 1, a composite electric heating component, a temperature detection module, a control module, and a power supply module.

[0019] The heat transfer medium evaporator tank 1 stores liquid heat transfer medium biphenyl-diphenyl ether. The original tube structure 2 inside the heat transfer medium evaporator tank 1 is retained, and liquid heat transfer medium hydrogenated terphenyl is still introduced into the tube structure 2 and heated by conventional high-temperature steam. The composite electric heating component serves as a backup heating unit and is fixedly installed inside the heat transfer medium evaporator tank 1 and is completely immersed in the liquid heat transfer medium biphenyl-diphenyl ether, ensuring that the heat generated by the composite electric heating component can be directly transferred to the liquid heat transfer medium biphenyl-diphenyl ether.

[0020] The composite electric heating assembly includes multiple finned electric heaters 3 and a columnar electric heater 4. The multiple finned electric heaters 3 are evenly distributed circumferentially along the inner wall of the heat medium evaporator tank 1. This distribution method allows heat to be evenly diffused to all areas inside the tank. The columnar electric heater 4 is fixed at the axial position of the heat medium evaporator tank 1, and its outer wall is provided with radial heat dissipation fins to avoid uneven local temperature during heating. Both the finned electric heaters 3 and the columnar electric heater 4 are sealed to the top of the heat medium evaporator tank 1 through flanges, which not only ensures the airtightness of the tank, but also facilitates the installation and replacement of the finned electric heaters 3. The top of the tank also has an inspection port 5 at the position corresponding to the finned electric heater 3. A sealing cover is installed at the inspection port 5 for convenient later maintenance.

[0021] The flange is connected to the heat medium evaporator tank 1 with a double-layer sealing structure, the inner layer of which is a metal spiral wound gasket and the outer layer is a silicone rubber sealing ring. A ceramic heat insulation sleeve is fitted on the outside of the flange.

[0022] The temperature detection module is used to monitor the temperature of the liquid-phase heat medium in real time. It includes five platinum resistance temperature sensors 6. Four of the platinum resistance temperature sensors 6 are distributed and completely immersed in the liquid-phase heat medium biphenyl-diphenyl ether inside the heat medium evaporator tank 1 to measure the temperature of the liquid-phase heat medium biphenyl-diphenyl ether. The fifth platinum resistance temperature sensor 6 is only used to measure the temperature of the gas-phase heat medium biphenyl-diphenyl ether. The five platinum resistance temperature sensors 6 can simultaneously collect temperature signals at different heights inside the tank, avoiding control errors caused by the detection deviation of a single sensor. The detection end of the platinum resistance temperature sensor 6 extends into the tank, and the signal output end is connected to the intelligent control module through a twisted pair shielded cable.

[0023] The intelligent control module uses a PLC controller as its core, combined with a touch screen to form a human-machine interface system. The touch screen can be used to set the normal operating temperature threshold (e.g., 280-300℃), start-up threshold (e.g., 290℃), and alarm threshold (e.g., 289℃) of the liquid heat transfer medium biphenyl-diphenyl ether. It also displays parameters such as the upper and lower temperatures inside the heat transfer medium evaporator tank 1, the start / stop status of the composite electric heating component, and its power in real time. The PLC controller receives signals from the platinum resistance temperature sensor 6. When the temperature inside the heat transfer medium evaporator tank 1 is detected to be lower than the start-up threshold, it automatically starts the composite electric heating component and adjusts the heating power according to the difference between the actual temperature and the target temperature (by controlling the number of finned electric heating tubes on and off or by using a power regulator). When the temperature rises back to the upper limit of the normal operating threshold, it controls the composite electric heating component to stop working.

[0024] The dual-redundant power supply module provides stable power to the device, including a mains power interface and a backup battery pack, which are connected by an automatic transfer switch. Under normal circumstances, the device is powered by the mains power. When the mains power is interrupted unexpectedly, the automatic transfer switch switches to the battery pack within 0.5 seconds to ensure that the device does not stop operating. The battery pack is equipped with a charging module, which can automatically replenish the power when the mains power is normal.

[0025] It also includes a multi-level alarm module, which includes a local audible and visual alarm and a remote SMS alarm, and is linked to the PLC controller to stop the machine. When the temperature is lower than the alarm threshold, if the temperature does not rise back to above the start threshold after 5 minutes of operation of the composite electric heating component, the PLC controller will control the local audible and visual alarm to issue an alarm signal, reminding staff to troubleshoot the fault in time.

[0026] It also includes a heat medium circulation auxiliary unit, which is a miniature magnetic pump 7 installed at the bottom of the tank. It is used to circulate the liquid phase heat medium biphenyl-biphenyl ether in the heat medium evaporator tank 1 so as to make the temperature uniform.

[0027] The intelligent control module includes a PLC controller (model S7-200 SMART) and a touch screen (model MT6071IP). The touch screen is connected to the PLC controller via an RS485 bus and can set temperature thresholds, display real-time data and equipment status.

[0028] The dual-redundant power supply module includes a mains power interface (380V three-phase power) and a backup power supply (24V battery pack, capacity 200Ah), which are connected by an automatic transfer switch (model ATS-63). The backup power supply is equipped with an intelligent charging module (model TC-2410).

[0029] The multi-level alarm module includes audible and visual alarms (audible and visual alarm device, model LTE-1101J) and remote SMS alarms, and is electrically connected to the output of the PLC controller.

[0030] Working principle: This heating device operates in parallel with the existing liquid-phase heat medium heating system. During daily production, the composite electric heating component is in standby mode. The conventional method for heating the liquid-phase heat medium hydrogenated terphenyl with high-temperature steam is to heat the liquid-phase heat medium biphenyl-bis(phenyl ether). When the steam boiler is unstable, causing the liquid-phase heat medium hydrogenated terphenyl to lose heat, the platinum resistance temperature sensor 6 detects that the temperature of the liquid-phase heat medium in the heat medium evaporator tank 1 has dropped to the start-up threshold (275°C). The temperature signal is transmitted to the PLC controller, which immediately starts the composite electric heating component. The finned electric heating tube and the columnar electric heater 4 directly heat the liquid-phase heat medium. As the temperature rises, when the temperature is detected to rise back to the upper limit of the normal operating threshold (290°C), the PLC controller controls the composite electric heating component to stop and return to standby mode. If the temperature continues to drop to the alarm threshold (275°C) and there is no improvement after the composite electric heating component is started, the local audible and visual alarm is triggered, prompting manual intervention. When the mains power is interrupted, the dual redundant power supply module automatically switches to the backup battery pack to ensure the normal operation of the device.

[0031] Existing electric heating devices are mostly arranged in a single circumferential direction, which easily leads to an excessive temperature difference between the center and the edge of the heat medium evaporator tank 1 (up to 5-8℃). This invention adopts a "circumferential + center" dual-unit composite layout: 1. Circumferential heating unit: Finned heating tubes are distributed along the inner wall, and the spiral fins increase the heat exchange area by 30%, ensuring rapid heating of the heat medium near the tank wall; 2. Central heating unit: The columnar electric heater 4 is located on the axis of the tank, and the radial fins diffuse heat in all directions to fill the blind area of ​​the central heat field; 3. Both are dynamically allocated power through an intelligent control module (such as increasing circumferential power when the edge temperature is low and increasing central power when the center temperature is low), so that the temperature difference at any point in the heat medium evaporator tank 1 is controlled within ≤2℃, which meets the stringent requirements of chemical fiber production for the uniformity of heat medium temperature.

[0032] Three-dimensional temperature detection and intelligent control (improving "control precision").

[0033] 1. Full-area detection coverage: 5 platinum resistance temperature sensors 6 monitor key areas such as the circumference, center, and corners respectively, avoiding the defect of a single sensor only reflecting local temperature; 2. Adaptive adjustment of thermal field: When the temperature difference between the circumferential middle layer and the central lower layer is detected to be >2℃, the PLC automatically reduces the power of the central heating unit by 10%-20% and increases the power of the corresponding side circumferential heating tube until the temperature difference returns to within the threshold. 3. Stepless power regulation: The thyristor power regulator replaces the traditional on / off control, realizing smooth changes in heating power and avoiding fluctuations in the performance of the heat medium caused by sudden temperature rises and falls.

[0034] Dual redundant power supply and auxiliary functions (enhancing reliability).

[0035] 1. Uninterrupted power supply: The main power supply circuit's regulated power supply can withstand mains power fluctuations of ±10%, the backup lithium battery pack capacity can meet the device's full-load operation for 2 hours, and the ATS switching time is ≤30ms, completely avoiding heating failure caused by mains power interruption. 2. Heat medium circulation assistance: The micro magnetic pump 7 automatically turns on at the initial stage of heating (first 5 minutes) to accelerate the convection of liquid heat medium, shortening the temperature equalization time in the tank from the usual 15 minutes to 8 minutes, reducing heating lag.

[0036] Multi-level alarm mechanism (optimized "fault response").

[0037] For scenarios involving "two instances of steam instability within a short period," a three-level response is implemented: 1. Level 1 Alarm: When the electric heating is first triggered due to unstable steam, a warning message will be displayed on the touch screen; 2. Level 2 alarm: If the electric heating is triggered again within 1 hour, the local audible and visual alarm will be activated, and a text message will be sent to the administrator at the same time; 3. Three-level linkage: If the temperature continues to drop to 285℃ (critical value) after the electric heater is started, the PLC controller will trigger the production line cooling protection to avoid material waste caused by direct shutdown.

[0038] Automated exhaust of non-condensable gases.

[0039] 1. The gas phase heat medium in spinning plays a role in heat preservation of the box and some pipelines. Since the melt system mainly relies on the heat medium for heating, it is necessary to install an exhaust tank at the highest point of the pipeline to exhaust the non-condensable gas accumulated inside the exhaust tank periodically to ensure the temperature balance in the system.

[0040] 2. Traditional exhaust systems operate manually. When the central control system issues a temperature alarm signal, three or two staff members are required to perform the exhaust operation. One staff member observes the temperature changes at the central control station, while the other two adjust the valve opening on-site. The staff communicate with each other via walkie-talkie to ensure temperature stability. However, the staff relies entirely on their own senses and work experience during operation. The accuracy of the adjustment varies from person to person, and there is no unified standard for temperature control, which leads to large temperature fluctuations and affects product quality.

[0041] 3. ① Remote control: After adding an automatic exhaust valve, staff can directly adjust the valve opening from the central control room and remotely control the system in real time according to temperature fluctuations.

[0042] ② Reduced staff ratio: This improvement not only reduces the number of on-site operators by two, but also eliminates the need for staff to manually adjust valves on-site, avoiding high-altitude operations and on-site operations in high-temperature environments, thus significantly reducing labor intensity and safety risks (such as heatstroke and burns).

[0043] ③ Improved exhaust stability: Reduced labor intensity for personnel, better control over temperature fluctuation range, and improved system stability and control precision.

[0044] 4. Manual exhaust: With the addition of automatic regulating valves, the exhaust system achieves intelligent and standardized upgrades in operation. After the central control system issues an alarm signal, the automatic valve can accurately execute the exhaust action according to the preset program, eliminating the need for manual on-site operation. This not only saves the time cost of personnel traveling back and forth and manual scheduling, but more importantly, it can control key parameters such as exhaust duration and valve opening within a uniform and precise range, completely avoiding the experience bias and randomness of manual operation.

[0045] 5. Two-way interlock: The automatic regulating valve and the level gauge have an interlock function. ① When the level gauge is below a certain level, the automatic regulating valve will stop venting to prevent the heat medium from leaking out. ② The automatic regulating valve and the exhaust tank temperature have an interlock function. When the exhaust tank temperature is lower than the set temperature, the automatic exhaust valve will open according to the set duration, number of times, and opening degree to vent. When the set duration and number of times are reached, the exhaust valve will close. (Specific parameters are based on practical experience.) This effectively maintains the overall balance of the system, significantly reduces temperature fluctuations caused by improper venting operations, ensures stable product quality from the source of the production process, reduces labor costs and the risk of human error, and further improves production efficiency and process reliability.

[0046] The advantages of this heating device are as follows: 1. Significantly improved heating uniformity: Through "circumferential + center" composite heating and dynamic power adjustment, the temperature difference of the heat medium inside the tank is ≤2℃, which is greatly optimized compared with the traditional device (temperature difference 2-4℃), reducing the problem of heat medium condensation caused by local low temperature.

[0047] 2. Higher control precision: With a ±0.1℃ precision sensor and stepless power adjustment, the temperature control error is ≤0.5℃, meeting the temperature stability requirements of high-end chemical fiber (such as ultra-fine denier polyester) production.

[0048] 3. Dual reliability guarantee: Dual redundant power supply + multi-level alarm reduces the risk of device failure to below 0.01%, while the heat medium circulation assists to shorten the heating response time by 40%.

[0049] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; 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; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

Claims

1. A backup heating device for a gas-phase heat medium used in melt-spun chemical fibers, characterized in that, It includes a heat transfer medium evaporator tank, a composite electric heating assembly, a three-dimensional temperature detection module, an intelligent control module, and a dual redundant power supply module; The heat medium evaporator tank contains a liquid heat medium, biphenyl-biphenyl ether. The composite electric heating component is fixedly installed inside the heat medium evaporator tank and is completely immersed in the liquid heat medium. The detection end of the three-dimensional temperature detection module extends into the heat medium evaporator tank to collect temperature signals across the entire range. The intelligent control module is electrically connected to the composite electric heating component and the three-dimensional temperature detection module respectively, and controls the heating state. The dual redundant power supply module provides power to each component.

2. The gas-phase heat medium backup heating device for melt direct spinning of chemical fibers according to claim 1, characterized by, The composite electric heating assembly includes a circumferential heating unit and a central heating unit. The circumferential heating unit includes multiple finned electric heating tubes that are evenly distributed circumferentially along the inner wall of the heat medium evaporator tank. The central heating unit is a columnar electric heater that is fixed at the axial position of the heat medium evaporator tank and has radial heat dissipation fins on its outer wall.

3. The gas-phase heat medium backup heating device for melt direct spinning of chemical fibers according to claim 2, characterized in that, Both the finned electric heating tube and the columnar electric heater are connected to the heat medium evaporator tank by flanges. The connection between the flange and the heat medium evaporator tank is provided with a double-layer sealing structure, in which the inner layer is a metal spiral wound gasket and the outer layer is a silicone rubber sealing ring. A ceramic heat insulation sleeve is fitted on the outside of the flange.

4. The standby heating device for gas-phase heat medium in melt direct spinning of chemical fibers according to claim 1, characterized in that, The three-dimensional temperature detection module includes five high-precision platinum resistance temperature sensors. Four of the platinum resistance temperature sensors are used to measure the temperature of the liquid-phase heat transfer medium biphenyl-diphenyl ether, and the fifth platinum resistance temperature sensor is used to measure the temperature of the gas-phase heat transfer medium biphenyl-diphenyl ether. The signal output terminals of the platinum resistance temperature sensors are connected to the intelligent control module through twisted-pair shielded cables.

5. The standby heating device for gas-phase heat medium in melt direct spinning of chemical fibers according to claim 4, characterized in that, The intelligent control module includes a PLC controller, a touch screen, and a power regulation module.

6. The gas phase heat medium backup heating device for melt direct spinning of chemical fibers according to claim 1, characterized in that, The dual-redundant power supply module includes a main power supply circuit and a backup power supply circuit, which are connected by an ATS automatic transfer switch.

7. The standby heating device for gas-phase heat medium in melt direct spinning of chemical fibers according to claim 5, characterized in that, It also includes a multi-level alarm module and a heat medium circulation auxiliary unit. The multi-level alarm module includes a local audible and visual alarm and a remote SMS alarm, and is linked to the PLC controller for shutdown. The heat medium circulation auxiliary unit is a miniature magnetic pump installed at the bottom of the tank.

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