WO2013190842A1 - Procédé de refroidissement et dispositif de refroidissement - Google Patents

Procédé de refroidissement et dispositif de refroidissement Download PDF

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Publication number
WO2013190842A1
WO2013190842A1 PCT/JP2013/003845 JP2013003845W WO2013190842A1 WO 2013190842 A1 WO2013190842 A1 WO 2013190842A1 JP 2013003845 W JP2013003845 W JP 2013003845W WO 2013190842 A1 WO2013190842 A1 WO 2013190842A1
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WO
WIPO (PCT)
Prior art keywords
heat medium
liquid nitrogen
temperature
heat
cooling
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2013/003845
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English (en)
Japanese (ja)
Inventor
瀬川　徹
友宏 平野
渓太 齊藤
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nisso Engineering Co Ltd
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Nisso Engineering Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by Nisso Engineering Co Ltd filed Critical Nisso Engineering Co Ltd
Priority to JP2014520957A priority Critical patent/JPWO2013190842A1/ja
Publication of WO2013190842A1 publication Critical patent/WO2013190842A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D3/00—Devices using other cold materials; Devices using cold-storage bodies
    • F25D3/10—Devices using other cold materials; Devices using cold-storage bodies using liquefied gases, e.g. liquid air

Definitions

  • the present invention relates to a heat medium cooling method and a heat medium cooling apparatus. More specifically, the present invention relates to a cooling method and a cooling apparatus that use a small amount of liquid nitrogen required for cooling a heat medium and reduce the loss of the heat medium due to entrainment.
  • a low temperature reaction apparatus is known as an apparatus for performing a chemical reaction at a low temperature.
  • Patent Document 1 arranges a coiled pipe in the tank, allows liquid nitrogen to flow through the pipe, and cools the reaction liquid through the pipe.
  • An apparatus that can be used is disclosed.
  • patent document 2 is disclosing the apparatus which flows a heat medium to the jacket attached to the tank wall surface, and cools a reaction liquid via a wall surface. In the apparatus of Patent Document 2, heat exchange is performed between the liquid nitrogen and the heat medium in the heat exchanger to cool the heat medium.
  • the method of cooling the reaction liquid with liquid nitrogen via a pipe tends to increase the amount of liquid nitrogen used. Further, when liquid nitrogen is directly introduced into the reaction solution, impurities are likely to be mixed into the reaction solution. On the other hand, as in the apparatus described in Patent Document 2, the method of cooling the reaction liquid with a heat medium cooled with liquid nitrogen easily prevents impurities from being mixed and shortens the rise time. However, the cooling of the heat medium with liquid nitrogen in the heat exchanger is performed using the latent heat of liquid nitrogen, and since sensible heat is not used, the utilization efficiency of liquid nitrogen is low and the consumption of liquid nitrogen tends to increase. .
  • An object of the present invention is to provide a heat medium cooling method and a heat medium cooling apparatus that use less liquid nitrogen required for cooling the heat medium.
  • the present inventor tried a method of cooling by directly introducing liquid nitrogen into the heat medium.
  • the heat medium was discharged to the outside accompanying the nitrogen exhaust gas, resulting in a significant loss of the heat medium. Therefore, the inventor has further studied and completed the invention of the following aspect.
  • [4] Means for exchanging heat between the heat medium and liquid nitrogen through a partition, Means for supplying liquid nitrogen to a region on the heat medium side in the heat exchange means; Means for supplying liquid nitrogen to an area on the liquid nitrogen side in the heat exchange means; Heat medium cooling having means for adjusting the amount of liquid nitrogen supplied to the region on the heat medium side in the heat exchange means, and means for adjusting the amount of liquid nitrogen supplied to the region on the liquid nitrogen side in the heat exchange means apparatus.
  • [5] means for measuring the temperature of the heat medium; Means for adjusting the amount of liquid nitrogen supplied to the region on the heat medium side and / or means for adjusting the amount of liquid nitrogen supplied to the region on the liquid nitrogen side based on the measured temperature value; 4].
  • the heat medium cooling device according to [4] or [5], which is used for adjusting the temperature of the heat medium for the low temperature reactor.
  • the heat medium cooling method and the heat medium cooling apparatus of the present invention require a small amount of liquid nitrogen used for cooling the heat medium. Moreover, since there is little heat medium accompanying nitrogen exhaust gas, there is almost no loss of the heat medium.
  • the cooling method and heating medium cooling apparatus of the present invention are suitable for cooling a heating medium for a low-temperature chemical reaction system.
  • FIG. 1 It is a conceptual diagram which shows the low-temperature chemical reaction system provided with the thermal-medium cooling device which concerns on one Embodiment of this invention. It is a figure which shows the weight change of the heat carrier in Example 1, the temperature change of a heat carrier, and the cumulative consumption weight of liquid nitrogen. It is a figure which shows the temperature change of the thermal medium in Example 1, the temperature change of a container gaseous phase, and the temperature change of a coil exit. It is a figure which shows the weight change of the heat carrier in Example 2, the temperature change of a heat carrier, and the cumulative consumption weight of liquid nitrogen. It is a figure which shows the temperature change of the thermal medium in Example 2, the temperature change of a container gaseous phase, and the temperature change of a coil exit.
  • a heat medium cooling device according to an embodiment of the present invention will be described with reference to FIG.
  • this invention is not limited by this embodiment,
  • transformation, addition, or abbreviation is included in the range suitable for the meaning and objective of this invention.
  • the apparatus shown in FIG. 1 has a heat medium cooling device 1, a liquid nitrogen container 11, and a low-temperature reactor 12.
  • a jacket 13 is installed in the low temperature reactor 12.
  • the heat medium enters the jacket 13 from the heat medium cooling device 1 through the tube 15 and returns from the jacket 13 through the tube 14 to the heat medium cooling device 1.
  • the jacket is installed in the low-temperature reactor, but it is not limited to this as long as it is a means (for example, a coiled tube, a multiple tube, etc.) that can adjust the temperature in the reactor with a heat medium.
  • the liquid nitrogen container 11 is a container that can store liquid nitrogen, and can supply liquid nitrogen from the liquid nitrogen container 11 to the heat medium cooling device 1.
  • the heat medium used in the present invention is not particularly limited as long as it can be used as a heat medium in a heat exchanger such as a jacket, a coiled tube, or a multiple tube.
  • a heat exchanger such as a jacket, a coiled tube, or a multiple tube.
  • ethylene glycol, acetone, methylene chloride, methanol, ethanol, or an aqueous solution thereof can be used. It is necessary to select a heat medium that does not freeze in the operating temperature range.
  • the heat medium has a freezing point that is preferably 10 ° C. or more lower than the lower limit of the use temperature.
  • the heat medium suitably used in the present invention has a freezing point of less than ⁇ 80 ° C.
  • the heat medium cooling device 1 includes a heat medium container 2 for storing the heat medium, and a coil tube 3 for introducing liquid nitrogen from the liquid nitrogen container 11 and exchanging heat with the heat medium.
  • Liquid nitrogen is present inside the coil tube 3, and a heat medium is present outside the coil tube 3, and heat exchange is performed between the two through the tube wall of the coil tube 3.
  • the amount of liquid nitrogen supplied to the coil tube 3 is adjusted by a valve 7.
  • the supply amount to the coiled tube 3 is not particularly limited, it is preferable to adjust according to the temperature of the heat medium to be measured.
  • the liquid nitrogen introduced into the coil tube 3 is preferably completely vaporized during the heat exchange.
  • a jacket can be provided around the heat medium container. Liquid nitrogen may be introduced into the jacket, and heat exchange may be performed between the liquid nitrogen and the heat medium via the container wall.
  • the heat medium cooling device 1 is provided with a pipe 4 for directly introducing liquid nitrogen from the liquid nitrogen container 11 into the heat medium.
  • the liquid nitrogen introduced by the tube 4 is in direct contact with the heat medium, and heat exchange is performed between them.
  • the nitrogen subjected to the heat exchange is discharged from the vent at the top of the heat medium container.
  • the amount of liquid nitrogen supplied to the tube 4 is adjusted by a valve 6.
  • the supply amount to the pipe 4 is not particularly limited, it is preferably adjusted according to the temperature of the heat medium to be measured.
  • the heat medium cooling device 1 has a stirring function so that liquid nitrogen introduced directly from the pipe 4 to the heat medium does not remain in the heat medium container 2 in a liquid state.
  • the shape of the opening of the tube 4 in the heat medium is not particularly limited, but it is preferable that the opening has a large diameter so that the heat medium does not freeze and block the opening. For example, it can be a trumpet-shaped opening.
  • the heat medium cooling device 1 preferably has means (not shown) for measuring the temperature of the heat medium, the temperature of the gas phase portion of the heat medium container 2, and the temperature of the nitrogen exhaust gas from the tube 3. Furthermore, the heat medium cooling device 1 may have means for controlling the means 6 and 7 for adjusting the amount of liquid nitrogen introduced into the pipe 4 and the pipe 3 according to the measured temperature value. preferable.
  • liquid nitrogen may be supplied to both the tube 4 and the tube 3 at the same time, or only one of the tube 4 and the tube 3 may be supplied.
  • the temperature of the heat medium when the temperature of the heat medium is equal to or higher than the set temperature, it is preferable to supply liquid nitrogen to the coil tube 3 and exchange heat between the heat medium and liquid nitrogen via a partition. Even when the temperature of the heat medium is equal to or higher than the set temperature, a smaller amount of liquid nitrogen than that supplied to the coiled tube 3 is supplied to the tube 4 within a range that does not impair the effects of the present invention. And may be directly contacted to exchange heat.
  • the temperature of the heat medium when the temperature of the heat medium is lower than the set temperature, it is preferable to supply liquid nitrogen to the pipe 4 and exchange heat by directly contacting the heat medium and liquid nitrogen. Even when the temperature of the heat medium is lower than the set temperature, the amount of liquid nitrogen smaller than the amount supplied to the tube 4 is supplied to the coil tube 3 within a range that does not impair the effects of the present invention.
  • Heat exchange may be performed with nitrogen through a partition. When heat exchange is performed through the partition when the temperature of the heat medium is equal to or higher than the set temperature, loss of the heat medium due to nitrogen entrainment can be eliminated. On the other hand, when the temperature of the heat medium is lower than the set temperature, it is possible to utilize the sensible heat of liquid nitrogen by directly contacting and performing heat exchange.
  • the set temperature is preferably any one of temperatures in the range of ⁇ 60 to + 20 ° C.
  • the heating medium is ethanol
  • the set temperature is preferably any one temperature in the range of ⁇ 40 to ⁇ 10 ° C., more preferably any one temperature in the range of ⁇ 30 to ⁇ 15 ° C. .
  • the heat medium cooling device of the present invention can further include means for separating the heat medium from the released nitrogen and means for recovering the vaporized heat medium.
  • the apparatus of the present invention can further be provided with a means for recovering the used nitrogen, and can be provided with a means for using the recovered nitrogen as a replacement gas for the reactor.
  • Example 1 As shown in FIG. 1, a coil tube 3 having a diameter of 10 mm and a blowing tube 4 having a diameter of 10 mm were attached to the heat medium container 2. One end of the coil tube 3 was installed outside the heat medium container, and the other end was connected to the liquid nitrogen container 11 via the flow rate control valve 7. One end of the blowing pipe 4 was installed in the heat medium container 2, and the other end was connected to the liquid nitrogen container 11 via the flow rate control valve 6. A temperature measuring device was installed at a position immersed in the heat medium, immediately above the liquid surface of the heat medium and in the vicinity of the coil outlet, and the temperature of the heat medium, the temperature of the gas phase of the heat medium container, and the exhaust gas temperature at the coil tube outlet were measured.
  • a heat medium 6.02 kg of ethanol (99.5%) was placed in a heat medium container and stirred with a stirrer.
  • the liquid nitrogen container and the heat medium container were placed on a platform scale, and the consumption of liquid nitrogen and the change in the weight of the heat medium were measured.
  • the heat medium temperature at the start of cooling was 12 ° C.
  • the valve 7 was opened and liquid nitrogen was supplied to the coil tube 3 at a flow rate of 6.48 kg / hr.
  • the valve 7 was closed and the valve 6 was opened at the same time, and liquid nitrogen was supplied to the blowing pipe 4 at a flow rate of 7.13 kg / hr.
  • FIG. 2 and 3 show changes in the weight and temperature of the heat medium, the cumulative consumption weight of liquid nitrogen, the temperature change in the container gas phase, and the temperature change at the coil outlet.
  • an upward arrow indicates switching from the coil tube 3 to the blowout tube 4.
  • the cumulative consumption of liquid nitrogen was about 6.85 kg, and it could be cooled to -66 ° C. There was almost no loss of the heat medium within the measurement error.
  • the coil outlet temperature is lower than the heat medium temperature during the period of heat exchange through the coil tube, and that latent heat is mainly used for cooling and sensible heat is not used much.
  • FIG. 3 shows that during the period in which liquid nitrogen is directly introduced, the gas phase temperature of the container is almost the same as the heat medium temperature, and the sensible heat of liquid nitrogen is effectively used for cooling.
  • Example 2 The heat medium was cooled by the same method as in Example 1 except that the operating conditions shown in Table 1 were changed.
  • 4 and 5 show changes in the weight and temperature of the heat medium, the accumulated consumption weight of liquid nitrogen, the temperature change in the container gas phase, and the temperature change at the coil outlet.
  • an upward arrow indicates switching from the coiled tube 3 to the outlet tube 4.
  • the cumulative consumption of liquid nitrogen was about 6.98 kg, and it could be cooled to -56 ° C. There was almost no loss of the heat medium within the measurement error. From FIG. 5, it can be seen that the coil exit temperature is lower than the heat medium temperature during the period of heat exchange through the coil tube, and latent heat is mainly used for cooling and sensible heat is not used much. . Further, it can be seen from FIG. 5 that during the period in which liquid nitrogen is directly introduced, the gas phase temperature of the container is almost the same as the heat medium temperature, and the sensible heat of liquid nitrogen is effectively used for cooling.
  • Example 1 The heat medium was cooled by the same method as in Example 1 except that the operating conditions shown in Table 1 were changed. 6 and 7 show the weight and temperature change of the heat medium, the cumulative consumption weight of liquid nitrogen, the temperature change of the container gas phase, and the temperature change of the coil outlet.
  • the cumulative consumption of liquid nitrogen was about 5.45 kg, and it could be cooled to -55 ° C.
  • the heat medium was greatly lost accompanying the nitrogen exhaust gas. From FIG. 7, it can be seen that during the period in which liquid nitrogen is directly introduced, the gas phase temperature of the container is substantially the same as the heat medium temperature, and the sensible heat of liquid nitrogen is effectively used for cooling.
  • Example 2 The heat medium was cooled by the same method as in Example 1 except that the operating conditions shown in Table 1 were changed. 8 and 9 show the weight and temperature change of the heat medium, the cumulative consumption weight of liquid nitrogen, the temperature change of the container gas phase, and the temperature change of the coil outlet.
  • the cumulative consumption of liquid nitrogen was about 7.37 kg for cooling to ⁇ 56 ° C.
  • the cumulative consumption of liquid nitrogen was about 9.49 kg for cooling to ⁇ 66 ° C.
  • the cooling rate decreased as the temperature of the heat medium decreased.
  • the coil outlet temperature became a temperature near the boiling point of liquid nitrogen. From FIG. 9, it is understood that the coil outlet temperature is lower than the heat medium temperature during the period of heat exchange through the coil tube, and that latent heat is mainly used for cooling and sensible heat is not used much. .

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Physical Or Chemical Processes And Apparatus (AREA)
PCT/JP2013/003845 2012-06-20 2013-06-20 Procédé de refroidissement et dispositif de refroidissement Ceased WO2013190842A1 (fr)

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Application Number Priority Date Filing Date Title
JP2014520957A JPWO2013190842A1 (ja) 2012-06-20 2013-06-20 冷却方法および冷却装置

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JP2012138673 2012-06-20
JP2012-138673 2012-06-20

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108800697A (zh) * 2018-05-29 2018-11-13 航天新长征电动汽车技术有限公司 一种制冷引射器、液氮制冷系统及厢式冷藏车

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5421643A (en) * 1977-07-18 1979-02-19 Toray Eng Co Ltd Method of cooling liquid
JP2001050622A (ja) * 1999-07-15 2001-02-23 Air Prod And Chem Inc 製品を冷凍する方法及び装置
US20020194853A1 (en) * 2000-06-28 2002-12-26 Cashin Michael D. Freezer and plant gas system
JP2009287822A (ja) * 2008-05-28 2009-12-10 Taiyo Nippon Sanso Corp 冷媒冷却装置

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5526777Y2 (fr) * 1976-03-31 1980-06-26
JPS57157879U (fr) * 1981-03-30 1982-10-04

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5421643A (en) * 1977-07-18 1979-02-19 Toray Eng Co Ltd Method of cooling liquid
JP2001050622A (ja) * 1999-07-15 2001-02-23 Air Prod And Chem Inc 製品を冷凍する方法及び装置
US20020194853A1 (en) * 2000-06-28 2002-12-26 Cashin Michael D. Freezer and plant gas system
JP2009287822A (ja) * 2008-05-28 2009-12-10 Taiyo Nippon Sanso Corp 冷媒冷却装置

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108800697A (zh) * 2018-05-29 2018-11-13 航天新长征电动汽车技术有限公司 一种制冷引射器、液氮制冷系统及厢式冷藏车

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