CN109333144B - Supercritical carbon dioxide transmission process - Google Patents
Supercritical carbon dioxide transmission process Download PDFInfo
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- CN109333144B CN109333144B CN201811269667.6A CN201811269667A CN109333144B CN 109333144 B CN109333144 B CN 109333144B CN 201811269667 A CN201811269667 A CN 201811269667A CN 109333144 B CN109333144 B CN 109333144B
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- carbon dioxide
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
- B23Q11/00—Accessories fitted to machine tools for keeping tools or parts of the machine in good working condition or for cooling work; Safety devices specially combined with or arranged in, or specially adapted for use in connection with, machine tools
- B23Q11/10—Arrangements for cooling or lubricating tools or work
- B23Q11/1038—Arrangements for cooling or lubricating tools or work using cutting liquids with special characteristics, e.g. flow rate, quality
- B23Q11/1053—Arrangements for cooling or lubricating tools or work using cutting liquids with special characteristics, e.g. flow rate, quality using the cutting liquid at specially selected temperatures
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
- B23Q11/00—Accessories fitted to machine tools for keeping tools or parts of the machine in good working condition or for cooling work; Safety devices specially combined with or arranged in, or specially adapted for use in connection with, machine tools
- B23Q11/10—Arrangements for cooling or lubricating tools or work
- B23Q11/1038—Arrangements for cooling or lubricating tools or work using cutting liquids with special characteristics, e.g. flow rate, quality
- B23Q11/1061—Arrangements for cooling or lubricating tools or work using cutting liquids with special characteristics, e.g. flow rate, quality using cutting liquids with specially selected composition or state of aggregation
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Abstract
The invention discloses a transmission process of supercritical carbon dioxide, which comprises the steps that a supercritical carbon dioxide flow regulating device is arranged between a supercritical carbon dioxide generating device and a supercritical carbon dioxide output device, and a transfer pipeline in the supercritical carbon dioxide flow regulating device is replaced until the transfer pipeline meets the output requirement; the auxiliary gas flow pipeline is sleeved outside the output pipeline of the supercritical carbon dioxide output device, and the heated auxiliary gas is continuously injected into the auxiliary gas flow pipeline, so that the flow regulation mode is simple and easy to implement, the auxiliary gas is wrapped outside the output pipeline of the supercritical carbon dioxide to play a role in temperature compensation, the stable property of the supercritical carbon dioxide fluid and the performance exertion of the supercritical carbon dioxide are ensured, and the supercritical carbon dioxide output device is used in the field of metal processing.
Description
Technical Field
The invention relates to the field of metal processing, in particular to a transmission process of supercritical carbon dioxide.
Background
With the rapid advance of modern advanced manufacturing technology, various new materials and new processes are produced, and higher requirements are put forward on the cutting speed of a machine tool, the service life of a cutter and the processing efficiency. Clean production, green manufacturing, has been one of the subjects of developing advanced manufacturing technologies. The low-temperature cooling lubrication cutting technology is proved to be an effective scheme for solving the difficult processing characteristics of strong cutting thermal shock and vibration of high-hardness and high-strength materials, easy generation of processing burrs during cutting of plastic materials and the like.
The low-temperature cutting technology commonly used at present mainly comprises the following steps: a low-temperature cold air (-30 ℃), liquid nitrogen (-179 ℃), liquid carbon dioxide (-78.5 ℃), and the like. The liquid carbon dioxide cooling technology adopts liquid carbon dioxide with the pressure of 5.0-6.5MPa, is conveyed by a pipeline and released at the front end of a nozzle, can be rapidly expanded and absorb heat at the nozzle to generate low temperature of-78.5 ℃ (theoretical value), and is successfully applied to cutting and cooling of difficult-to-process materials. In order to approach the theoretical low temperature value as much as possible, the pressure drop rate of the liquid carbon dioxide in the conveying pipeline needs to be strictly controlled, and the conveying pipeline needs to be effectively insulated so as to avoid the liquid carbon dioxide from being frozen and blocking the pipeline due to rapid pressure drop in the pipeline. Due to the defects of the liquid carbon dioxide cooling technology, the technology is not popularized and applied in a large area at present.
In view of the above problems, attention has recently been paid to cooling and lubrication in cutting machining using supercritical carbon dioxide fluid. Pressurizing the low-pressure carbon dioxide gas to be more than 7.4MPA through a pressurizing system and heating the low-pressure carbon dioxide gas to be more than 31.7 ℃, so that the carbon dioxide can be in a supercritical state. The carbon dioxide in the supercritical state is sprayed out, and due to the rapid pressure drop of the supercritical carbon dioxide fluid, the supercritical carbon dioxide fluid instantaneously absorbs heat and expands, so that the spraying area achieves the effect of instantaneous low temperature (-78.5 ℃).
Although supercritical carbon dioxide has been widely used in extraction, etching and cleaning processes in pharmaceutical industry, chemical engineering and semiconductor industry, the application of supercritical carbon dioxide in cooling of processes to achieve efficient cooling of the processes is still in a deep development stage. Patent ZL200680022912.2 discloses a lubrication method for metalworking based on supercritical carbon dioxide, which involves the incorporation of a lubricant in the supercritical carbon dioxide fluid and the system composition of applying the supercritical carbon dioxide during metalworking. The patent 201710867324.9 discloses a supercritical carbon dioxide centralized liquid supply system, and describes the composition of the centralized liquid supply system and the centralized liquid supply method. Different from a liquid carbon dioxide cooling technology, the pressure of supercritical carbon dioxide in a conveying pipeline is required to be always maintained to be greater than or equal to 7.4MPa and the temperature of the supercritical carbon dioxide in the conveying pipeline is required to be greater than or equal to 31.7 ℃, so that the supercritical carbon dioxide fluid is ensured to be rapidly subjected to pressure drop to form a low-temperature medium.
The existing supercritical carbon dioxide system mostly relates to a mode of obtaining supercritical carbon dioxide fluid, proves that the supercritical carbon dioxide can be effectively applied to metal processing, and does not relate to how to control the output of the supercritical carbon dioxide, how to ensure that the carbon dioxide in a pipeline is always in a supercritical state, how to control the jet flow of the supercritical carbon dioxide and the like.
Disclosure of Invention
The invention aims to provide a supercritical carbon dioxide conveying process with accurate flow control and strong conveying stability.
The technical scheme adopted by the invention is as follows:
a process for the delivery of supercritical carbon dioxide comprising the steps of:
1) a supercritical carbon dioxide flow regulating device is arranged between the supercritical carbon dioxide generating device and the supercritical carbon dioxide output device, and the output requirement is met by replacing a transfer pipeline in the supercritical carbon dioxide flow regulating device;
2) generating supercritical carbon dioxide by a supercritical carbon dioxide generating device, wherein the supercritical carbon dioxide flows into an output pipeline of a supercritical carbon dioxide output device through a supercritical carbon dioxide flow regulating device;
3) an auxiliary gas flow pipeline is sleeved outside an output pipeline of the supercritical carbon dioxide output device, and heated auxiliary gas is continuously injected into the auxiliary gas flow pipeline.
Further as an improvement of the technical scheme of the invention, in the step 1), a capillary tube is used as a transfer pipeline, and the value range of the inner hole diameter D of the transfer pipeline is 0.05-2 mm.
As a further improvement of the technical scheme of the invention, the supercritical carbon dioxide flow regulating device further comprises a feeding switching module and a discharging switching module, wherein the supercritical carbon dioxide flows into the switching pipeline through the feeding switching module and then flows into an output pipeline of the supercritical carbon dioxide output device through the discharging switching module.
Further as an improvement of the technical scheme of the invention, an airflow adapter is arranged on the discharging adapter module, and the auxiliary gas flows into the auxiliary airflow pipeline through the airflow adapter.
As a further improvement of the technical scheme of the invention, the auxiliary gas is heated by the heating device before entering the auxiliary gas flow pipeline.
As a further improvement of the technical scheme of the invention, the temperature of the auxiliary gas is greater than or equal to 32 ℃.
As further improvement of the technical scheme of the invention, the auxiliary gas comprises compressed air, nitrogen, carbon dioxide gas and argon.
Further as an improvement of the technical scheme of the invention, the capillary tube is used as an output pipeline of the supercritical carbon dioxide output device, and the value range of the diameter of the inner hole is 0.05-2 mm.
As a further improvement of the technical scheme of the invention, in the step 3), the supercritical carbon dioxide and the auxiliary gas flow are simultaneously sprayed out through the nozzle.
The invention has the beneficial effects that: according to the transmission process of the supercritical carbon dioxide, before the supercritical carbon dioxide is conveyed, the transfer pipeline is switched to meet the flow processing requirement of the supercritical carbon dioxide through the supercritical carbon dioxide flow regulating device, the flow is changed mainly by switching the length of the transfer pipeline, meanwhile, the auxiliary gas wraps the output pipeline of the supercritical carbon dioxide to play a role in temperature compensation, the temperature value of the supercritical carbon dioxide is maintained to be always in or close to the temperature value range required by the supercritical state, and the stable property of the supercritical carbon dioxide fluid and the performance of the supercritical carbon dioxide are ensured.
Drawings
The invention will be further described with reference to the accompanying drawings in which:
FIG. 1 is a schematic diagram of the overall structure of an embodiment of the present invention;
FIG. 2 is a schematic view of a supercritical carbon dioxide output device and a supercritical carbon dioxide flow regulating device according to an embodiment of the present invention;
FIG. 3 is a schematic structural diagram of a supercritical carbon dioxide flow regulating device according to an embodiment of the present invention;
fig. 4 is an exploded schematic view of a supercritical carbon dioxide output device and a supercritical carbon dioxide flow rate adjusting device according to an embodiment of the present invention.
Detailed Description
Referring to fig. 1 to 4, the present invention is a supercritical carbon dioxide transmission process, including the following steps:
1) a supercritical carbon dioxide flow regulating device 2 is arranged between the supercritical carbon dioxide generating device 1 and the supercritical carbon dioxide output device 3, the transfer pipeline 22 in the supercritical carbon dioxide flow regulating device 2 is replaced to meet the output requirement, and the flow is changed mainly by switching the length of the transfer pipeline 22;
2) generating supercritical carbon dioxide by a supercritical carbon dioxide generating device 1, wherein the supercritical carbon dioxide flows into an output pipeline 31 of a supercritical carbon dioxide output device 3 through a supercritical carbon dioxide flow regulating device 2;
3) an auxiliary gas flow pipe 32 is externally fitted to the output pipe 31 of the supercritical carbon dioxide output device 3, and heated auxiliary gas is continuously injected into the auxiliary gas flow pipe 32.
Specifically, the supercritical carbon dioxide generation device 1 is used for converting low-pressure carbon dioxide into a supercritical carbon dioxide fluid, and mainly includes a carbon dioxide source 11, a pressurization device 12, a storage container 13, a heater 14, a delivery line, and a switching valve provided on the delivery line. The pressurization device 12 is used for performing pressurization action on the low-pressure carbon dioxide. In order to ensure the fluid state and the property of the supercritical carbon dioxide, the upper limit value of the carbon dioxide pressurization is set to be 7.5-30 MPa, and the upper limit value of the pressurization is adjustable according to the actual cutting application requirements. The heater 14 is used to warm the pressurized carbon dioxide. In order to ensure the state and the property of the supercritical carbon dioxide fluid required by the supercritical carbon dioxide cooling and lubricating system, the upper limit of the heating temperature of the heater 14 is set to be 31.7-100 ℃, and the upper limit of the heating temperature can be adjusted according to the actual cutting application requirements.
The device further comprises an auxiliary gas flow device 5, wherein the auxiliary gas flow device 5 comprises an auxiliary gas source 51, the auxiliary gas source 51 is connected with the auxiliary gas flow pipeline 32 through a pipeline, a valve 52 and a heating device 53 are further arranged between the auxiliary gas source 51 and the auxiliary gas flow pipeline 32, and the heating device 53 is used for heating the auxiliary gas. A filter is also provided between the auxiliary air supply 51 and the air inlet.
Before the supercritical carbon dioxide is conveyed, the transfer pipeline 22 is switched to meet the flow processing requirement of the supercritical carbon dioxide through the supercritical carbon dioxide flow regulating device 2, the flow of the supercritical carbon dioxide is changed mainly by switching the length of the transfer pipeline 22, meanwhile, the auxiliary gas is wrapped outside the output pipeline 31 of the supercritical carbon dioxide to play a role in temperature compensation, the temperature value of the supercritical carbon dioxide is maintained to be always in or close to the temperature value range required by the supercritical state, and the stable property temperature and the performance of the supercritical carbon dioxide are ensured.
As a preferred embodiment of the present invention, in step 1), a capillary tube is used as the transfer pipeline 22, the value range of the inner hole diameter D of the transfer pipeline 22 is 0.05-2 mm, the manner of adjusting the supercritical carbon dioxide flow rate by the capillary tube is realized by replacing quantitative capillary tubes with different inner diameters and lengths, and the adjustable range of the supercritical carbon dioxide flow rate is as follows: 0.1 to 20 kg/h.
The inner diameter of the transit line 22 is defined to be 0.05 to 2mm, and the viscosity of carbon dioxide in a liquid state is about equal to 0.0127. The calculation is combined with the supercritical carbon dioxide density, the Reynolds number is smaller, the influence of the viscous force on the flow field is larger than the inertia, the disturbance of the flow velocity in the flow field is attenuated due to the viscous force, and the fluid flow is stable and is laminar. And the laminar flow can generate large internal friction in the flow, resulting in energy loss, thereby reducing the flow velocity of the fluid. By applying the theorem, the flow rate control of the supercritical carbon dioxide can be realized, and then the output flow rate control of the supercritical carbon dioxide is realized by controlling the flow rate.
As a preferred embodiment of the present invention, the supercritical carbon dioxide flow rate regulating device 2 further includes a feeding adapter module 21 and a discharging adapter module 23, and the supercritical carbon dioxide flows into the transfer pipeline 22 through the feeding adapter module 21 and then flows into the output pipeline 31 of the supercritical carbon dioxide output device 3 through the discharging adapter module 23. In a preferred embodiment of the present invention, a gas flow adapter 231 is provided on the discharge adapter module 23, and the auxiliary gas flows into the auxiliary gas flow duct 32 through the gas flow adapter 231.
The discharging switching module 23 can connect the output pipeline 31 and the auxiliary gas flow pipeline 32 at the same time, so that the output structure of the supercritical carbon dioxide and the auxiliary gas is more compact to a certain extent, and the installation and connection of each pipeline are facilitated.
As a preferred embodiment of the present invention, the secondary gas is heated by a heating device before entering the secondary gas flow duct 32.
As a preferred embodiment of the invention, the temperature of the auxiliary gas is greater than or equal to 32 ℃.
In a preferred embodiment of the present invention, the auxiliary gas includes compressed air, nitrogen, carbon dioxide gas, and argon.
As a preferred embodiment of the invention, a capillary tube is adopted as the output pipeline 31 of the supercritical carbon dioxide output device 3, the diameter range of the inner hole is 0.05-2 mm, and compared with a conventional pressure-resistant refrigerant tube or a steel tube, the capillary tube realizes effective control of the pressure drop rate during output of the supercritical carbon dioxide.
In a preferred embodiment of the present invention, in step 3), the supercritical carbon dioxide and the auxiliary gas flow are simultaneously sprayed through the nozzle 4, and the auxiliary gas is finally sprayed out from the nozzle 4, so that the supercritical carbon dioxide can be prevented from freezing at the nozzle 4 and further blocking the nozzle 4 during spraying.
The invention is not limited to the above embodiments, and those skilled in the art can make equivalent modifications or substitutions without departing from the spirit of the invention, and such equivalent modifications or substitutions are included in the scope of the claims of the present application.
Claims (8)
1. A process for the delivery of supercritical carbon dioxide comprising the steps of:
1) a supercritical carbon dioxide flow regulating device is arranged between the supercritical carbon dioxide generating device and the supercritical carbon dioxide output device, the transfer pipelines in the supercritical carbon dioxide flow regulating device are replaced until the transfer pipelines meet the output requirement, the lengths of different transfer pipelines are different, and a capillary tube is used as the transfer pipeline to realize the pressure drop efficiency control;
2) generating supercritical carbon dioxide by a supercritical carbon dioxide generating device, wherein the supercritical carbon dioxide flows into an output pipeline of a supercritical carbon dioxide output device through a supercritical carbon dioxide flow regulating device;
3) an auxiliary gas flow pipeline is sleeved outside an output pipeline of the supercritical carbon dioxide output device, heated auxiliary gas is continuously injected into the auxiliary gas flow pipeline, and the supercritical carbon dioxide and the auxiliary gas flow are simultaneously sprayed out through a nozzle.
2. The process for the delivery of supercritical carbon dioxide as claimed in claim 1, wherein: the value range of the inner hole diameter D of the transfer pipeline is 0.05-2 mm.
3. The process for the delivery of supercritical carbon dioxide as claimed in claim 1, wherein: the supercritical carbon dioxide flow adjusting device further comprises a feeding switching module and a discharging switching module, wherein supercritical carbon dioxide flows into the switching pipeline through the feeding switching module and then flows into an output pipeline of the supercritical carbon dioxide output device through the discharging switching module.
4. The process for the delivery of supercritical carbon dioxide as claimed in claim 3, wherein: an airflow switching port is arranged on the discharging switching module, and auxiliary gas flows into the auxiliary airflow pipeline through the airflow switching port.
5. The process for the delivery of supercritical carbon dioxide as claimed in claim 1, wherein: the auxiliary gas is heated by the heating device before entering the auxiliary gas flow pipeline.
6. The process for the delivery of supercritical carbon dioxide as claimed in claim 5, wherein: the temperature of the assist gas is greater than or equal to 32 ℃.
7. The process for the delivery of supercritical carbon dioxide as claimed in claim 1, wherein: the auxiliary gas comprises compressed air, nitrogen, carbon dioxide gas and argon.
8. The process for the delivery of supercritical carbon dioxide as claimed in claim 1, wherein: the capillary tube is used as an output pipeline of the supercritical carbon dioxide output device, and the value range of the diameter of the inner hole is 0.05-2 mm.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811269667.6A CN109333144B (en) | 2018-10-29 | 2018-10-29 | Supercritical carbon dioxide transmission process |
| KR1020217016106A KR20210105341A (en) | 2018-10-29 | 2019-05-24 | Supercritical carbon dioxide supply control system and process |
| PCT/CN2019/088288 WO2020087918A1 (en) | 2018-10-29 | 2019-05-24 | Supercritical carbon dioxide supply regulation and control system and process |
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| CN201811269667.6A CN109333144B (en) | 2018-10-29 | 2018-10-29 | Supercritical carbon dioxide transmission process |
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| CN109333144B true CN109333144B (en) | 2020-08-25 |
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| WO2020087918A1 (en) * | 2018-10-29 | 2020-05-07 | 汇专科技集团股份有限公司 | Supercritical carbon dioxide supply regulation and control system and process |
| CN110756903B (en) * | 2019-11-04 | 2021-12-31 | 深圳市普林司顿模具塑胶有限公司 | Processing equipment for improving processing precision of injection mold and processing technology thereof |
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| CN2659661Y (en) * | 2003-12-19 | 2004-12-01 | 华南理工大学 | Preparation and delivery appts. of supercritical CO2 fluid for shaping processing microporous plastic |
| JP5113040B2 (en) * | 2005-04-29 | 2013-01-09 | ザ リージェンツ オブ ザ ユニバーシティ オブ ミシガン | Metalworking lubricant composition based on supercritical carbon dioxide |
| US20090320655A1 (en) * | 2008-06-30 | 2009-12-31 | Marion Billingsley Grant | Machining tool utilizing a supercritical coolant |
| CN101357310B (en) * | 2008-09-02 | 2011-09-21 | 浙江大学 | Device for preparing particulates using supercritical fluid assistant spray and use thereof |
| CN102233342A (en) * | 2010-04-28 | 2011-11-09 | 中国科学院微电子研究所 | Carbon dioxide multifunctional cleaning machine |
| CN105675445B (en) * | 2016-03-25 | 2018-06-05 | 中国石油大学(华东) | Supercritical carbon dioxide capillary viscometer and application method under a kind of high temperature and pressure |
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| CN207205987U (en) * | 2017-09-22 | 2018-04-10 | 东莞安默琳机械制造技术有限公司 | A kind of supercritical carbon dioxide compound atomizing jet for intermetallic composite coating |
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| US5205154A (en) * | 1991-11-01 | 1993-04-27 | Brigham Young University | Apparatus and method for simultaneous supercritical fluid extraction and gas chromatography |
| WO2014198915A1 (en) * | 2013-06-14 | 2014-12-18 | Voss Automotive Gmbh | Line connector and line set for fluid media |
| CN104764245A (en) * | 2015-04-02 | 2015-07-08 | 清华大学 | Super-critical fluid spray cooling system and application method thereof |
| CN108568700A (en) * | 2018-06-14 | 2018-09-25 | 广州汇专工具有限公司 | A kind of metal cutting process low-temperature carbon dioxide cooling and lubricating system |
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