Supercritical CO2 dyeing temperature stability control device and use method thereof

Abstract

The invention discloses a supercritical CO2 dyeing temperature stability control device, which comprises a CO2 dyeing circulation system loop consisting of an intermediate storage tank, a dyeing heater, a pressure pump, an inlet valve, a dye kettle, a circulating dyeing heater, a dyeing kettle and a circulating dyeing pump, the heat conduction oil heating furnace is adopted for heating to generate heat conduction oil with the temperature higher than the dyeing temperature to heat the dyeing system, and the working conditions of dyeing pressure and temperature are established; an electric heater is used for heating to generate heat conduction oil with the temperature lower than the dyeing temperature so as to control the problems that in the circulating dyeing process, CO2 is circulated by a circulating dyeing pump for doing work to generate heat, fluid flows in a pipe at a high channel speed, friction is generated to generate heat, and consequently the circulating dyeing temperature deviates, and a refrigerating machine is used for providing circulating cooling water to control the temperature rise of low-temperature heat conduction oil. The problems of low dyeing efficiency, high energy consumption, poor color fastness, color difference, fabric wrinkling, even scorching and the like caused by large dyeing temperature deviation are effectively solved.

Description

Technical Field

[0001] The present invention belongs to the technical field of supercritical CO2 dyeing processes, and particularly relates to a control device for stabilizing the temperature of supercritical CO2 dyeing and a method for using the same. Background Art

[0002] During the supercritical CO2 dyeing process, after the CO2 phase change reaches the dyeing process conditions, the dye is continuously dissolved by circulating through a high-pressure fluid circulation pump, and then enters the dyeing kettle to dye the fabric. That is, it changes from a liquid state to a supercritical state for continuous cyclic dyeing, and then throttles and depressurizes to change into a gaseous state to separate from the excess dye, recycle, condense and liquefy, and store for reuse in the next kettle dyeing. After the supercritical CO2 phase change reaches the required pressure and temperature for the dyeing process during the dyeing process, it is necessary to circulate the CO2 in the dyeing system through a high-flow high-pressure fluid circulation pump, dissolve the dye in the dye kettle, and carry the saturated CO2 with the dye into the dyeing kettle to fully contact the fabric and release the dye to dye the fabric. The CO2 that reaches the dyeing process temperature condition stops pressurization and heating. However, due to reasons such as the compression and cyclic work of the high-pressure fluid circulation pump and the heat generated by fluid flow friction, the temperature of the supercritical CO2 fluid continuously rises, resulting in poor color stability of the product and even quality problems such as scorching.

[0003] Currently, a heat transfer oil is generally used in the dyeing device to ensure the process temperature during the dyeing process. The heat transfer oil is introduced into the jacket of the dye kettle, the jacket of the dye kettle, and the shell side of the circulating heater for heating. Condensate coils are further arranged in the jacket of the dye kettle and the jacket of the dye kettle. The temperature of the dyeing is ensured by the way of cooling water entering the coil to circulate and cool the heat transfer oil. However, due to the structure and thickness of the kettle body, this method requires repeated heating or cooling of the heat transfer oil, which not only has high energy consumption, but also has a long time to establish the dyeing conditions and large temperature fluctuations. Therefore, we provide a control device for stabilizing the temperature of supercritical CO2 dyeing and a method for using the same. Summary of the Invention

[0004] Aiming at the above problems, the purpose of the present invention is to provide a control device for stabilizing the temperature of supercritical CO2 dyeing and a method for using the same, which can solve the problems that after the CO2 that reaches the dyeing process temperature condition stops pressurization and heating, due to reasons such as the compression and cyclic work of the high-pressure fluid circulation pump and the heat generated by fluid flow friction, the temperature of the supercritical CO2 fluid continuously rises, resulting in poor color stability of the product and even quality problems such as scorching.

[0005] The present invention is realized through the following technical solutions: A control device for stable temperature in supercritical CO2 dyeing, comprising a CO2 dyeing circulation system loop composed of an intermediate storage tank, a dyeing heater, a pressure pump, an inlet valve, a dye kettle, a circulating dyeing heater, a dyeing kettle and a circulating dyeing pump, and further comprising a high-temperature heating device, a low-temperature heating device and a PLC control system; the intermediate storage tank is connected to the dyeing heater and the pressure pump, and is connected to the dye kettle through the inlet valve by pipeline; the dye kettle is connected to the circulating dyeing heater by pipeline; the circulating dyeing heater is connected to the dyeing kettle by pipeline through the circulating dyeing pump; the high-temperature heating device is connected to the CO2 dyeing circulation system loop for providing high-temperature heat-conducting oil for the CO2 dyeing circulation system loop; the low-temperature heating device is connected to the CO2 dyeing circulation system loop for providing low-temperature heat-conducting oil for the CO2 dyeing circulation system loop; the PLC control system is used for receiving the detected data of each pressure and temperature, and controlling the switches of the CO2 dyeing circulation system loop, the high-temperature heating device and the low-temperature heating device.

[0006] The dyeing heater is of shell-and-tube type; the dye kettle is of jacket type, the circulating dyeing heater is of shell-and-tube type, and the dyeing kettle is of jacket type; the high-temperature heating device and the low-temperature heating device are respectively connected to the shell side of the dyeing heater, the jacket of the dye kettle, the shell side of the circulating dyeing heater and the jacket of the dyeing kettle.

[0007] The high-temperature heating device is a pipeline oil heating furnace.

[0008] The low-temperature heating device comprises a low-temperature oil tank, an electric heater and a refrigerating machine; a coil for heat exchange is arranged in the low-temperature oil tank; the electric heater is arranged in the low-temperature oil tank; the refrigerating machine is connected to the coil in the low-temperature oil tank through a pipeline.

[0009] A using method of the control device for stable temperature in supercritical CO2 dyeing comprises the following steps: a. Pressurize the liquid CO2 in the intermediate storage tank to a preset pressure of 10 - 25 MPa with a pressure pump; b. After heating the high-pressure liquid CO2 at the outlet of the pressure pump to a preset supercritical state process temperature of 50 - 80 °C with the dyeing heater, successively enter the dye kettle, the circulating dyeing heater and the dyeing kettle; c. Pump out the CO2 in the dyeing kettle with the circulating dyeing pump, enter the circulating dyeing heater, increase the temperature and pressure, after reaching the dyeing process conditions, the CO2 enters the dyeing kettle to dissolve the dye, and the saturated CO2 carrying the dye enters the dyeing kettle to release the dye for dyeing the fabric. d. Feed the high-temperature heat-conducting oil in the high-temperature heating device, which is higher than the dyeing temperature, into the jacket of the dye kettle, the shell side of the circulating dyeing heater, and the jacket of the dyeing kettle; continue to heat the supercritical CO2 in the CO2 dyeing circulation system loop to the set dyeing process temperature, close the inlet and outlet valves of the high-temperature heating device, and stop feeding the high-temperature hot oil. e. Feed the low-temperature heat-conducting oil in the low-temperature heating device, which is lower than the dyeing temperature, into the shell side of the dyeing heater, the jacket of the dye kettle, the shell side of the circulating dyeing heater, and the jacket of the dyeing kettle to refrigerate the CO2 dyeing circulation system loop.

[0010] Heat the heat-conducting oil in the high-temperature heating device to 10 - 20°C higher than the dyeing temperature; heat the heat-conducting oil in the low-temperature heating device to 3 - 5°C lower than the dyeing temperature.

[0011] The refrigerating machine provides cold water at 10 - 20°C to the low-temperature oil tank to circulate and cool the low-temperature heat-conducting oil, so as to ensure the constant temperature of the low-temperature oil tank.

[0012] Advantages of the present invention: Use a heat-conducting oil heating furnace to heat and generate heat-conducting oil higher than the dyeing temperature to heat the dyeing system, establish the working conditions of dyeing pressure and temperature, use an electric heater to heat and generate heat-conducting oil lower than the dyeing temperature to control the temperature deviation problem caused by the heat generated by the circulating dyeing pump circulating CO2 and the heat generated by the high-speed flow and friction of the fluid in the pipe during the circulating dyeing process. Use a refrigerating machine to provide circulating cooling water to control the temperature rise of the low-temperature heat-conducting oil, effectively solving the problems of low dyeing efficiency, high energy consumption, poor color fastness, color difference, fabric wrinkles, and even scorching caused by large dyeing temperature deviation. Brief description of the drawings

[0013] The present invention will be further described in detail below with reference to the drawings.

[0014] Figure 1 It is a schematic structural diagram of the control device for stable supercritical CO2 dyeing temperature of the present invention.

[0015] As shown in the figure: 1 - intermediate storage tank; 2 - dyeing heater; 3 - pressure pump; 4 - inlet valve; 5 - dye kettle; 6 - circulating dyeing heater; 7 - dyeing kettle; 8 - circulating dyeing pump; 9 - heating furnace; 10 - low-temperature oil tank; 11 - electric heater; 12 - refrigerating machine. Specific embodiments

[0016] The following specific embodiments illustrate the implementation manners of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification.

[0017] It should be noted that the structures, proportions, sizes, etc. depicted in the accompanying drawings of this specification are only used to cooperate with the content disclosed in the specification for those familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the present invention. Therefore, they do not have any technical substantial meaning. Any modification of the structure, change of the proportional relationship, or adjustment of the size, without affecting the effects that the present invention can produce and the purposes that can be achieved, should still fall within the scope covered by the technical content disclosed in the present invention. At the same time, the terms such as "upper", "lower", "left", "right", "middle", etc. cited in this specification are only for the convenience of narration and are not used to limit the scope of implementation of the present invention. The change or adjustment of their relative relationship, without substantial change in the technical content, should also be regarded as the scope of implementation of the present invention.

[0018] In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "connected" and "coupled" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. It should be noted that the terms "including", "comprising", or any other variant are intended to cover non-exclusive inclusion, so that a process, method, article, or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article, or device.

[0019] As Figure 1 shown, a control device for stable temperature of supercritical CO2 dyeing includes a CO2 dyeing circulation system loop composed of an intermediate storage tank 1, a dyeing heater 2, a pressure pump 3, an inlet valve 4, a dye kettle 5, a circulating dyeing heater 6, a dyeing kettle 7, and a circulating dyeing pump 8, and also includes a high-temperature heating device, a low-temperature heating device, and a PLC control system; the intermediate storage tank 1 is connected to the dyeing heater 2 and the pressure pump 3, and is connected to the dye kettle 5 through the inlet valve 4 by pipeline; the dye kettle 5 is connected to the circulating dyeing heater 6 by pipeline; the circulating dyeing heater 6 is connected to the dyeing kettle 7 through the circulating dyeing pump 8 by pipeline; the high-temperature heating device is connected to the CO2 dyeing circulation system loop for providing high-temperature heat-conducting oil for the CO2 dyeing circulation system loop; the low-temperature heating device is connected to the CO2 dyeing circulation system loop for providing low-temperature heat-conducting oil for the CO2 dyeing circulation system loop; the PLC control system is used to receive the detection data of each pressure and temperature, and control the switches of the CO2 dyeing circulation system loop, the high-temperature heating device, and the low-temperature heating device.

[0020] The dyeing heater 2 is of the shell-and-tube type; the dye kettle 5 is of the jacketed type, the circulating dyeing heater 6 is of the shell-and-tube type, and the dyeing kettle 7 is of the jacketed type; the high-temperature heating device and the low-temperature heating device are respectively connected to the shell side of the dyeing heater 2, the jacket of the dye kettle 5, the shell side of the circulating dyeing heater 6, and the jacket of the dyeing kettle 7.

[0021] The high-temperature heating device is a pipeline oil heating furnace 9.

[0022] The low-temperature heating device includes a low-temperature oil tank 10, an electric heater 11, and a refrigerating machine 12; the electric heater 11 is arranged inside the low-temperature oil tank 10; the refrigerating machine 12 is coiled around the low-temperature oil tank 10 through a pipeline.

[0023] A method for using a supercritical CO2 dyeing temperature stable control device includes the following steps: a. Pressurize the liquid CO2 in the intermediate storage tank 1 to a preset pressure of 10 - 25 MPa with a pressure pump 3; b. After heating the high-pressure liquid CO2 at the outlet of the pressure pump 3 pressurized by the dyeing heater 2 to a preset supercritical state process temperature of 50 - 80 °C, it sequentially enters the dye kettle 5, the circulating dyeing heater 6, and the dyeing kettle 7; c. Pump out the CO2 in the dyeing kettle 7 with a circulating dyeing pump 8, enter the circulating dyeing heater 6, increase the temperature and pressure, and after reaching the dyeing process conditions, the CO2 enters the dyeing kettle 7 to dissolve the dye, and the saturated CO2 carrying the dye enters the dyeing kettle 7 to release the dye for dyeing the fabric. d. Heat the oil in the high-temperature heating device to 10 - 20 °C higher than the dyeing temperature, and pass the high-temperature heat-conducting oil into the jacket of the dye kettle 5, the shell side of the circulating dyeing heater 6, and the jacket of the dyeing kettle 7; continue to heat the supercritical CO2 in the CO2 dyeing circulation system loop to the set dyeing process temperature, close the inlet and outlet valves of the high-temperature heating device, and stop passing the high-temperature hot oil. e. Heat the heat-conducting oil in the low-temperature heating device to 3 - 5 °C lower than the dyeing temperature, and pass the low-temperature heat-conducting oil into the shell side of the dyeing heater 2, the jacket of the dye kettle 5, the shell side of the circulating dyeing heater 6, and the jacket of the dyeing kettle 7 to refrigerate the CO2 dyeing circulation system loop.

[0024] The PLC control system receives the pressure and temperature detection data of each part, and timely feeds back to the corresponding machines, pumps, valves, etc. to implement remote precise control.

[0025] The heat-conducting oil furnace provides the main heat source for establishing the dyeing conditions of the dyeing system, the electric heater provides the process medium close to the dyeing process temperature for the system, and the refrigerating machine provides cold energy to balance the heat generated by the compression of the high-pressure fluid circulation by the dyeing circulation pump and the fluid flow friction, so as to achieve the purpose of temperature stability in the supercritical CO2 dyeing process.

[0026] Use a high-temperature heating device to provide the main heat source for establishing the dyeing conditions of the dyeing system, and heat the high-pressure liquid CO2 after being pressurized by the pressure pump 3 in the system to 1°C lower than the dyeing process temperature; use the electric heater 11 to heat the heat-conducting oil in the low-temperature oil tank 10 to 3-5°C lower than the dyeing process temperature, and circulate and cool to balance the heat generated by the compression work of the high-pressure fluid circulation by the circulating dyeing pump 8 and the friction of the fluid flow; use the refrigerator 12 to provide cold water at 10-20°C to circulate and cool the low-temperature heat-conducting oil to ensure the stability of the low-temperature heat-conducting oil temperature, and thus ensure the stability of the dyeing temperature.

[0027] The protection scope of the present invention is not limited to the technical solutions disclosed in the specific embodiments. Any modifications, equivalent replacements, improvements, etc. made to the above embodiments based on the technical essence of the present invention shall fall within the protection scope of the present invention.

Claims

1. A control device for stable supercritical CO2 dyeing temperature, characterized in that: It includes a CO2 dyeing circulation system loop composed of an intermediate storage tank (1), a dyeing heater (2), a pressure pump (3), an inlet valve (4), a dye kettle (5), a circulating dyeing heater (6), a dyeing kettle (7) and a circulating dyeing pump (8), and also includes a high-temperature heating device, a low-temperature heating device and a PLC control system; the intermediate storage tank (1) is connected to the dyeing heater (2) and the pressure pump (3), and is connected to the dye kettle (5) through the inlet valve (4) by pipeline; the dye kettle (5) is connected to the circulating dyeing heater (6) by pipeline; the circulating dyeing heater (6) is connected to the dyeing kettle (7) by pipeline through the circulating dyeing pump (8); the high-temperature heating device is connected to the CO2 dyeing circulation system loop for providing high-temperature heat-conducting oil for the CO2 dyeing circulation system loop; the low-temperature heating device is connected to the CO2 dyeing circulation system loop for providing low-temperature heat-conducting oil for the CO2 dyeing circulation system loop; the PLC control system is used to receive various pressure and temperature detection data and control the switches of the CO2 dyeing circulation system loop, the high-temperature heating device and the low-temperature heating device.

2. The control device for stable supercritical CO2 dyeing temperature according to claim 1, wherein: The dyeing heater (2) is of shell-and-tube type; the dye kettle (5) is of jacket type, the circulating dyeing heater (6) is of shell-and-tube type, and the dyeing kettle (7) is of jacket type; the high-temperature heating device and the low-temperature heating device are respectively connected to the shell side of the dyeing heater (2), the jacket of the dye kettle (5), the shell side of the circulating dyeing heater (6) and the jacket of the dyeing kettle (7).

3. The control device for stable supercritical CO2 dyeing temperature according to claim 1 or 2, characterized in that: The high-temperature heating device is a pipeline oil heating furnace (9).

4. The control device for stable supercritical CO2 dyeing temperature according to claim 1 or 2, characterized in that: The low-temperature heating device includes a low-temperature oil tank (10), an electric heater (11) and a refrigerating machine (12); a coil for heat exchange is arranged in the low-temperature oil tank (10); the electric heater (11) is arranged in the low-temperature oil tank (10); the refrigerating machine (12) is connected to the coil in the low-temperature oil tank (10) through a pipeline.

5. The usage method of a supercritical CO2 dyeing temperature stable control device according to claim 1 or 2, characterized in that: It includes the following steps: a. Pressurize the liquid CO2 in the intermediate storage tank (1) to a preset pressure of 10 - 25 MPa with the pressure pump (3); b. Heat the high-pressure liquid CO2 at the outlet of the pressure pump (3) pressurized by the dyeing heater (2) to a preset supercritical state process temperature of 50 - 80 °C, and then successively enter the dye kettle (5), the circulating dyeing heater (6) and the dyeing kettle (7); c. Pump out the CO2 in the dyeing kettle (7) with the circulating dyeing pump (8), enter the circulating dyeing heater (6), increase the temperature and pressure, after reaching the dyeing process conditions, the CO2 enters the dyeing kettle (7) to dissolve the dye, and the saturated CO2 carrying the dye enters the dyeing kettle (7) to release the dye for dyeing the fabric. d. Pass the high-temperature heat-conducting oil higher than the dyeing temperature in the high-temperature heating device into the jacket of the dye kettle (5), the shell side of the circulating dyeing heater (6) and the jacket of the dyeing kettle (7); continue to heat the supercritical CO2 in the CO2 dyeing circulation system loop to the set dyeing process temperature, close the inlet and outlet valves of the high-temperature heating device, and stop passing the high-temperature hot oil. e. Feed the low-temperature heat-conducting oil in the low-temperature heating device, which is lower than the dyeing temperature, into the shell side of the dyeing heater (2), the jacket of the dyeing kettle (5), the shell side of the circulating dyeing heater (6) and the jacket of the dyeing kettle (7) to cool the CO2 dyeing circulation system loop.

6. The usage method of a supercritical CO2 dyeing temperature stable control device according to claim 5, characterized in that: Heat the heat-conducting oil in the high-temperature heating device to 10-20 °C higher than the dyeing temperature; heat the heat-conducting oil in the low-temperature heating device to 3-5 °C lower than the dyeing temperature.

7. The usage method of a supercritical CO2 dyeing temperature stable control device according to claim 5, characterized in that: The refrigerating machine (12) provides cold water at 10-20 °C to the low-temperature oil tank (10) to circulate and cool the low-temperature heat-conducting oil for ensuring the constant temperature of the low-temperature oil tank.

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