CN112083027A - Spontaneous combustion test device - Google Patents
Spontaneous combustion test device Download PDFInfo
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- CN112083027A CN112083027A CN202010242369.9A CN202010242369A CN112083027A CN 112083027 A CN112083027 A CN 112083027A CN 202010242369 A CN202010242369 A CN 202010242369A CN 112083027 A CN112083027 A CN 112083027A
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- 238000002485 combustion reaction Methods 0.000 title claims abstract description 32
- 230000002269 spontaneous effect Effects 0.000 title claims abstract description 32
- 230000002093 peripheral effect Effects 0.000 claims description 15
- 238000010438 heat treatment Methods 0.000 claims description 10
- 239000007789 gas Substances 0.000 description 90
- 239000012495 reaction gas Substances 0.000 description 15
- 238000006243 chemical reaction Methods 0.000 description 12
- 238000005259 measurement Methods 0.000 description 7
- 230000002401 inhibitory effect Effects 0.000 description 6
- 238000007254 oxidation reaction Methods 0.000 description 6
- 230000005855 radiation Effects 0.000 description 5
- 229910001220 stainless steel Inorganic materials 0.000 description 5
- 239000010935 stainless steel Substances 0.000 description 5
- 239000011261 inert gas Substances 0.000 description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical group [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- 239000000919 ceramic Substances 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 229910001873 dinitrogen Inorganic materials 0.000 description 2
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000003750 conditioning effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 229910001882 dioxygen Inorganic materials 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 239000012212 insulator Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 229910052697 platinum Inorganic materials 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N25/00—Investigating or analyzing materials by the use of thermal means
- G01N25/02—Investigating or analyzing materials by the use of thermal means by investigating changes of state or changes of phase; by investigating sintering
- G01N25/12—Investigating or analyzing materials by the use of thermal means by investigating changes of state or changes of phase; by investigating sintering of critical point; of other phase change
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N31/00—Investigating or analysing non-biological materials by the use of the chemical methods specified in the subgroup; Apparatus specially adapted for such methods
- G01N31/12—Investigating or analysing non-biological materials by the use of the chemical methods specified in the subgroup; Apparatus specially adapted for such methods using combustion
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- Life Sciences & Earth Sciences (AREA)
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- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Combustion & Propulsion (AREA)
- Molecular Biology (AREA)
- Engineering & Computer Science (AREA)
- Investigating Or Analyzing Materials Using Thermal Means (AREA)
Abstract
The invention relates to a spontaneous combustion test device. A gas flow path is formed between a heater core having a cylindrical shape and an inner cylinder provided inside the heater core so as to surround a sample. The gas supply unit supplies gas to the sample through the flow path. The heater wound around the heater core heats the atmosphere around the sample and also heats the gas flowing through the flow path.
Description
Technical Field
The invention relates to a spontaneous combustion test device.
Background
The autoignition test apparatus is an apparatus that measures the conditions of temperature or time at which a sample reaches autoignition. For example, in the spontaneous combustion test apparatus described in japanese patent No. 3632299, a sample to be measured is housed in the apparatus main body, and an inert gas is supplied into the apparatus main body. In this state, the temperature control of the apparatus main body is started so that the sample temperature is maintained at a predetermined set temperature. This gradually increases the sample temperature from the initial value, and stabilizes the sample temperature when the set temperature is reached.
After the temperature of the sample is stabilized, oxygen gas is supplied into the apparatus main body instead of the inert gas. In this case, the temperature of the sample rises due to oxidation of the sample, and when the temperature of the sample reaches an unknown ignition point, the sample starts to spontaneously ignite. Here, the time from the point when the sample temperature is stable to the point when the sample starts to spontaneously ignite is measured.
Disclosure of Invention
In japanese patent No. 3632299, a temperature stability determination circuit objectively determines whether or not a sample temperature is stable at a set temperature. Thus, it is considered that the time until the sample starts to self-ignite can be accurately measured. However, the time until the sample starts to spontaneously ignite, which is measured by the spontaneous combustion test apparatus described above, varies depending on the environment of the room in which the spontaneous combustion test apparatus is installed, the season, and the like. Therefore, a large deviation occurs in the time of measurement. Therefore, the conditions under which the sample reaches autoignition cannot be evaluated with high accuracy.
The invention aims to provide a spontaneous combustion test device which can evaluate the condition that a sample achieves spontaneous combustion with high precision.
According to an aspect of one aspect of the present invention, there is provided a spontaneous combustion test apparatus for evaluating a condition under which a sample reaches spontaneous combustion, the spontaneous combustion test apparatus including: a heater core having a cylindrical shape; an inner cylinder which is provided inside the heater core so as to surround the sample and which forms a gas flow path between the inner cylinder and the heater core; a gas supply unit that supplies a gas to the sample through the flow path; and a heater wound around the heater core, for heating an atmosphere around the sample and heating the gas flowing through the flow path.
Drawings
FIG. 1 is a schematic cross-sectional view of an autoignition test apparatus according to an embodiment of the present invention,
FIG. 2 is a sectional view showing the structure of a temperature adjusting part of the sample chamber in FIG. 1,
FIG. 3 is a view for explaining a detailed flow of air in the main body,
figure 4 is an enlarged partial cross-sectional view of the sample chamber temperature conditioning portion of figure 2,
fig. 5 is a sectional view taken along line a-a of the temperature control unit of the sample chamber of fig. 4.
Detailed Description
(1) Structure of spontaneous combustion test device
Hereinafter, an autoignition test apparatus according to an embodiment of the present invention will be described with reference to the drawings. Fig. 1 is a schematic cross-sectional view of an autoignition test apparatus according to an embodiment of the present invention. As shown in fig. 1, the spontaneous combustion test apparatus 100 includes a main body 10, a sample holder 20, a gas supply unit 30, an air bath temperature control unit 40, a flow regulating member 50, a sample chamber temperature control unit 60, and a control unit 70. In the following description, the direction in which gravity is directed is referred to as downward, and the opposite direction is referred to as upward.
The main body 10 is, for example, a rectangular parallelepiped case, and is formed of stainless steel in the present embodiment. The side wall of the main body 10 is filled with a heat insulator 11. An air bath (thermostatic bath) 12 having an environment with a predetermined temperature range insulated from the outside is realized inside the main body 10. In this example, the upper limit of the temperature range is 300 ℃. As described later, the sample S to be measured is disposed substantially in the center of the inside of the body 10. Hereinafter, a space in a certain range around the sample S inside the body 10 is referred to as a sample chamber 13.
The sample holder 20 extends in the vertical direction, and holds a sample container 21 containing a sample S at a lower end portion. The sample container 21 is formed of, for example, glass, and has an opening 21a (see fig. 2 described later) for introducing various gases supplied from the gas supply unit 30. The sample holder 20 is fixed to the upper surface of the body 10 in a state of being inserted through the opening 14 formed in the upper surface of the body 10. Thus, the sample container 21 held at the lower end of the sample holder 20 is positioned at the substantially central portion (sample chamber 13) of the interior of the body 10.
The gas supply unit 30 selectively supplies a reaction inhibiting gas, a reaction gas, and a reaction stopping gas to the sample S stored in the sample container 21. The reaction-inhibiting gas is an inert gas (nitrogen gas in this example), and inhibits the oxidation reaction of the sample S. The reaction gas is an oxygen concentration adjusting gas or air, and promotes the oxidation reaction of the sample S. The reaction-stopping gas is an inert gas (nitrogen gas in this example), and stops the oxidation reaction of the sample S. The gas supplied to the sample S is guided upward along the sample holder 20, passes through the opening 14 of the body 10, and is then discharged from a gas discharge port 22 formed in the sample holder 20. The details of the gas flow path will be described later.
The air bath temperature control unit 40 includes a heater 41, a temperature sensor 42, a fan 43, and a motor 44. The heater 41, the temperature sensor 42, and the fan 43 are disposed in the main body 10. The motor 44 is disposed below the main body 10. A rotary shaft 44a of the motor 44 is connected to the fan 43 through an opening 15 formed in the lower surface of the main body 10. The heater 41 is, for example, a heating wire, and adjusts the temperature of the air bath 12. The temperature sensor 42 is, for example, a platinum temperature measuring resistor, and detects the temperature of the air bath 12. The fan 43 rotates to stir the atmosphere of the air bath 12. The motor 44 drives the fan 43 to rotate.
The flow straightening member 50 is a member having a bottomed cylindrical shape formed of a material having a small heat capacity such as stainless steel. The thickness of the side wall of the rectifying member 50 is, for example, 0.5mm, and the thickness of the bottom wall of the rectifying member 50 is, for example, 1.5 mm. The rectifying member 50 is fixed to the lower surface of the main body 10 by point contact while surrounding the sample chamber 13, and introduces an atmosphere stirred by the fan 43 into the main body from the upper portion (see the thick arrow in fig. 1). An opening 51 (see fig. 2 described later) having a diameter of, for example, 45mm is formed in a portion of the bottom wall of the flow straightening member 50 located above the fan 43. Air is supplied to the central portion of the fan 43 via the opening 51. The sample chamber temperature adjusting unit 60 adjusts the temperature of the sample chamber 13. The detailed structure of the sample chamber temperature control unit 60 will be described later.
The control unit 70 includes a gas control unit 71, an air bath control unit 72, a sample chamber control unit 73, and a measurement unit 74. The gas control unit 71 controls the gas supply unit 30 by switching a valve, not shown, provided in the gas supply unit 30 to selectively supply the reaction suppressing gas, the reaction gas, and the reaction stopping gas.
The air bath control unit 72 receives a set temperature input by the user. The air bath control unit 72 controls the heater 41 so that the temperature of the air bath 12 detected by the temperature sensor 42 matches the set temperature described above. The sample chamber controller 73 controls the sample chamber temperature controller 60 so that the temperature of the sample chamber 13 matches the temperature of the sample S. The measuring section 74 measures the time until the sample S starts self-ignition. Details of the sample chamber controller 73 and the measuring unit 74 will be described later.
(2) Sample chamber temperature regulating part
Fig. 2 is a sectional view showing the structure of the sample chamber temperature control unit 60 of fig. 1. As shown in fig. 2, the sample chamber temperature adjusting section 60 includes a core holder 61, a heater core 62, a heater 63, an inner cylinder 64, a radiation cylinder 65, and temperature sensors 66 and 67. The core holder 61 is a member having a cylindrical shape formed of, for example, stainless steel, and is disposed inside the rectifying member 50 so as to surround the sample chamber 13. A plurality of openings 61a having a diameter of, for example, 15mm are formed in the side surface of the core holder 61. The core holder 61 holds the heater core 62, the inner tube 64, and the radiation tube 65 in a state of being fixed to the lower surface of the rectifying member 50.
Fig. 3 is a diagram for explaining the flow of air in detail in the main body 10. As indicated by thick arrows in fig. 3, the air diffused to the outside of the fan 43 by the rotation of the fan 43 is guided upward by the flow rectification member 50, and is introduced from the upper portion of the flow rectification member 50 into the space between the inner peripheral portion of the flow rectification member 50 and the outer peripheral portion of the core holder 61. The air in the space is introduced into the space inside the core holder 61 through the plurality of openings 61a formed in the core holder 61, and then is guided to the central portion of the fan 43 through the opening 51 in the bottom of the flow rectification member 50. Thus, air circulates in the main body 10.
Fig. 4 is a partially enlarged sectional view of the sample chamber temperature-adjusting section 60 of fig. 2. Fig. 5 is a sectional view taken along line a-a of the sample chamber temperature-adjusting section 60 of fig. 4. The heater core 62 is formed of an insulating material (e.g., ceramic) and has a cylindrical shape whose lower portion is closed as shown in fig. 4. The inner diameter of the heater core 62 is 34mm, for example. A groove 62a that extends in the vertical direction and rotates in a spiral shape is formed in the outer peripheral surface of the heater core 62. The heater 63 is, for example, a heating wire having a thickness of 0.7mm, and is wound around the heater core 62 in a state of being fitted into the groove portion 62 a.
The inner cylinder 64 has a cylindrical shape, and the outer diameter of the inner cylinder 64 is 33mm, for example. The inner cylinder 64 is formed of a material having a small heat capacity and a high thermal conductivity. The sidewall of the inner barrel 64 is preferably of a small thickness. In the present embodiment, the inner cylinder 64 is formed of ceramic, and the thickness of the side wall thereof is 1 mm. The embodiment is not limited to this, and the inner cylinder 64 may be formed of other materials. For example, when the upper limit of the set temperature is about 300 ℃, the inner cylinder 64 may be formed of stainless steel. In this case, the thickness of the side wall of the inner tube 64 can be further reduced.
The inner cylinder 64 is disposed inside the heater core 62 so as to surround the sample chamber 13, and is concentric with the heater core 62. Thereby, an annular gap having a width w (0.5 mm in this example) is formed between the outer peripheral surface of the inner tube 64 and the inner peripheral surface of the heater core 62 (see fig. 5). The gap serves as a flow path 68 for supplying gas to the sample S. The details of which will be described later. In this example, the space outside the inner cylinder 64 is divided into the sample chamber 13, and the sample container 21 containing the sample S is disposed in the sample chamber 13.
The radiation cylinder 65 has a cylindrical shape, and is formed of, for example, ceramic. The radiation tube 65 is disposed so as to surround the heater core 62, and stabilizes the temperature while maintaining the heater core 62 at a high temperature. When the upper limit of the set temperature is about 300 ℃, the sample chamber temperature adjusting unit 60 may not include the radiation tube 65.
The temperature sensor 66 is, for example, a sheath thermocouple, and is attached to the inside of the sample container 21. The temperature sensor 66 detects the temperature of the sample S stored in the sample container 21, and provides the detection result to the sample chamber control unit 73 in fig. 1. The temperature sensor 67 is, for example, a sheath thermocouple, and is embedded in the heater core 62. The temperature sensor 67 detects the temperature of the heater core 62 as the temperature of the sample chamber 13, and supplies the detection result to the sample chamber control unit 73. The sample chamber control section 73 controls the heater 63 so that the temperature of the sample chamber 13 detected by the temperature sensor 67 matches the temperature of the sample S detected by the temperature sensor 66.
A connection port 69 connected to the gas supply unit 30 is formed in a portion of the heater core 62 above the heater 63. The gas pipe 31 of the gas supply unit 30 is connected to the connection port 69. Further, the gas pipe 31 is welded to a heater fixing fitting 32 made of stainless steel for fixing the heater core 62. The heater core 62 is fixed to the heater fixing fitting 32 by fastening the graphite ring 33 with the graphite ring fixing fitting 34. The graphite ring 33 fixes the heater core 62 and functions as a sealing member for preventing gas leakage.
The gas pipe 31 supplies the reaction gas from the connection port 69 to the flow path 68 between the inner tube 64 and the heater core 62. As indicated by the broken-line arrows in fig. 4, the supplied reaction gas flows downward in the flow path 68. Here, the temperature of the reaction gas is not constant depending on the environment of the room in which the spontaneous combustion test apparatus 100 is installed, the season, and the like. However, the reaction gas flows through the flow path 68 and is heated by the heater 63. Thereby, the temperature of the reaction gas rises to the same level as the temperature of the sample chamber 13, that is, the temperature of the sample S.
Thereafter, the reaction gas is introduced into the sample container 21 through the opening 21a in the lower portion of the sample container 21, and is supplied to the sample S. In this case, the temperature of the reaction gas rises to the same level as the temperature of the sample S, and therefore the temperature of the sample S does not decrease due to the influence of the temperature of the reaction gas. As a result, the variation in the conditions under which the sample S spontaneously ignited can be suppressed, and the conditions under which the sample S spontaneously ignited can be evaluated with high accuracy.
The reaction-inhibiting gas or the reaction-stopping gas is also supplied from the gas pipe 31 to the sample S through the same flow path 68 as the reaction gas. Therefore, the reaction-inhibiting gas or the reaction-stopping gas may be supplied to the sample S while the reaction-inhibiting gas or the reaction-stopping gas is heated in the flow path 68 by the heater 63.
(3) Operation of the spontaneous Combustion test apparatus
The operation of the spontaneous combustion test apparatus 100 will be described with reference to fig. 1. First, the user stores the sample S to be measured in the sample container 21, and mounts the sample container 21 on the lower portion of the sample holder 20. Next, the user fixes the sample holder 20 to the upper surface of the body 10 in a state of being inserted into the opening 14 of the body 10. Thereby, the sample container 21 is disposed in the sample chamber 13.
Next, the user inputs the set temperature by operating the air bath control unit 72. After the set temperature is input, the air bath control unit 72 controls the heater 41 so that the temperature of the air bath 12 matches the set temperature. Further, the fan 43 rotates to stir the atmosphere of the air bath 12. The gas controller 71 controls the gas supplier 30 to supply the reaction suppressing gas at a flow rate adjusted by the user. In this case, the temperature of the sample S gradually rises from the initial value. The sample chamber controller 73 controls the sample chamber temperature controller 60 so that the temperature of the sample chamber 13 follows the temperature of the sample S.
The temperature of the sample S is stable when it reaches the set temperature. At this time, the measurement unit 74 starts time measurement. The gas controller 71 controls the gas supplier 30 to supply the reaction gas at a flow rate adjusted by the user instead of the reaction-inhibiting gas. This accelerates the oxidation reaction of the sample S, and the temperature of the sample S rises. The flow rate of the reaction gas is relatively small, for example, 2 to 5 mL/min. The sample chamber controller 73 controls the sample chamber temperature controller 60 so that the temperature of the sample chamber 13 follows the temperature of the sample S.
When the temperature of the sample S reaches the ignition point, the temperature of the sample S rises sharply. At this time, the measurement unit 74 ends the measurement of the time. The gas controller 71 controls the gas supplier 30 to supply the reaction-stopping gas at a flow rate adjusted by the user instead of the reaction gas. This stops the oxidation reaction of the sample S, thereby preventing spontaneous combustion. Further, the flow rate of the reaction stop gas is larger than the flow rate of the reaction suppressing gas. The time measured by the measuring section 74 is evaluated as a condition that the sample S reaches autoignition.
(4) Effect
In the spontaneous combustion test apparatus 100 of the present embodiment, the flow path 68 for the gas is formed between the heater core 62 and the inner cylinder 64, the heater core 62 has a cylindrical shape, and the inner cylinder 64 is provided inside the heater core 62 so as to surround the sample S. The gas is supplied to the sample S by the gas supply unit 30 through the flow path 68. The heater 63 wound around the heater core 62 heats the atmosphere around the sample S and also heats the gas flowing through the flow path 68.
According to this configuration, even when the temperature of the gas is not constant due to the environment of the room in which the spontaneous combustion test apparatus 100 is installed, the atmosphere surrounding the sample S can be raised to the same temperature by heating the gas in the flow path 68. Therefore, the time at which the sample S reaches the self-ignition is prevented from largely varying. This makes it possible to evaluate the conditions under which the sample S spontaneously ignites with high accuracy.
The width w of the flow path 68 (the distance between the outer peripheral surface of the inner tube 64 and the inner peripheral surface of the heater core) was 0.5 mm. The gas supply unit 30 supplies gas to the sample S from a position above the upper end of the heater 63 via the flow path 68, and the lower end of the flow path 68 is positioned below the sample S. According to the above configuration, even when the flow rate of the gas is relatively large, the gas can be sufficiently heated while passing through the flow path 68. In addition, heated gas can be efficiently supplied to the sample S from below the sample S.
(5) Other embodiments
(a) In the above embodiment, the measuring unit 74 measures the time until the sample S starts autoignition as the condition that the sample S reaches autoignition, but the embodiment is not limited thereto. The measurement unit 74 may measure the temperature at which the sample S spontaneously ignites as the condition for the sample S to spontaneously ignite.
(b) In the above embodiment, the width w of the flow path 68 is 0.5mm, but the embodiment is not limited thereto. For example, the width w of the flow channel 68 may be 1mm or less. According to this configuration, even when the flow rate of the gas is relatively large, the gas can be sufficiently heated while passing through the flow path 68. On the other hand, in the case where the gas can be sufficiently heated while passing through the flow channel 68, the width w of the flow channel 68 may be larger than 1 mm.
(c) In the above embodiment, the gas supply unit 30 supplies the gas to the sample S from a position above the upper end of the heater 63 through the flow path 68, but the embodiment is not limited thereto. When the gas can be sufficiently heated while passing through the flow path 68, the gas supply unit 30 may supply the gas to the sample S through the flow path 68 from a position below the upper end of the heater 63.
(d) In the above embodiment, the lower end of the flow path 68 is located below the sample S (the lower end of the sample container 21), but the embodiment is not limited thereto. When the gas can be sufficiently heated while passing through the flow channel 68, the lower end of the flow channel 68 may be located above the sample S.
(6) Form of the composition
(item 1) A spontaneous combustion test apparatus for evaluating conditions under which a sample reaches spontaneous combustion, wherein the spontaneous combustion test apparatus may be,
this spontaneous combustion test device includes:
a heater core having a cylindrical shape;
an inner cylinder which is provided inside the heater core so as to surround the sample and which forms a gas flow path between the inner cylinder and the heater core;
a gas supply unit that supplies a gas to the sample through the flow path; and
and a heater wound around the heater core, for heating an atmosphere around the sample and heating the gas flowing through the flow path.
In this spontaneous combustion test apparatus, a gas flow path is formed between a heater core having a cylindrical shape and an inner cylinder provided inside the heater core so as to surround a sample. The gas supply unit supplies gas to the sample through the flow path. The heater wound around the heater core heats the atmosphere around the sample and also heats the gas flowing through the flow path.
According to this configuration, even when the temperature of the gas is not constant due to the environment of the room in which the spontaneous combustion test apparatus is installed, the temperature of the gas can be raised to the same level as the temperature of the atmosphere surrounding the sample by heating the gas in the flow path. Therefore, it is possible to prevent a large variation in the temperature, time, and the like at which the sample spontaneously ignites. This makes it possible to evaluate the conditions under which the sample spontaneously ignites with high accuracy.
(item 2) in the spontaneous combustion test apparatus according to item 1, it is also possible that,
the flow path is formed between the outer peripheral surface of the inner tube and the inner peripheral surface of the heater core,
the distance between the outer peripheral surface of the inner tube and the inner peripheral surface of the heater core is 1mm or less.
According to this configuration, even when the flow rate of the gas is relatively large, the gas can be sufficiently heated while passing through the flow path.
(item 3) in the autoignition test apparatus according to item 1 or 2, the autoignition test apparatus may be,
the heater core and the inner cylinder are arranged such that the flow path is directed in the vertical direction,
the gas supply unit is configured such that gas flows downward through the flow path,
the flow path is configured to supply gas to the sample from below the sample.
In this case, the gas heated in the flow channel can be efficiently supplied to the sample.
(item 4) in the spontaneous combustion test apparatus according to item 3, the spontaneous combustion test apparatus may further comprise,
the gas supply unit supplies a gas to the sample from a position above the upper end of the heater through the flow path.
In this case, the gas can be heated more sufficiently while the gas passes through the flow path.
(claim 5) in the autoignition test apparatus according to claim 3 or 4, the autoignition test apparatus may be,
the lower end of the flow path is located below the sample.
In this case, the gas can be heated more sufficiently while the gas passes through the flow path.
Claims (5)
1. A spontaneous combustion test apparatus for evaluating a condition under which a sample reaches spontaneous combustion, wherein,
this spontaneous combustion test device includes:
a heater core having a cylindrical shape;
an inner cylinder which is provided inside the heater core so as to surround the sample and which forms a gas flow path between the inner cylinder and the heater core;
a gas supply unit that supplies a gas to the sample through the flow path; and
and a heater wound around the heater core, for heating an atmosphere around the sample and heating the gas flowing through the flow path.
2. The autoignition test apparatus according to claim 1,
the flow path is formed between the outer peripheral surface of the inner tube and the inner peripheral surface of the heater core,
the distance between the outer peripheral surface of the inner tube and the inner peripheral surface of the heater core is 1mm or less.
3. The autoignition test apparatus according to claim 1 or 2,
the heater core and the inner cylinder are arranged such that the flow path is directed in the vertical direction,
the gas supply unit is configured such that gas flows downward through the flow path,
the flow path is configured to supply gas to the sample from below the sample.
4. The autoignition test apparatus according to claim 3,
the gas supply unit supplies a gas to the sample from a position above the upper end of the heater through the flow path.
5. The autoignition test apparatus according to claim 3 or 4,
the lower end of the flow path is located below the sample.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2019109849A JP2020201195A (en) | 2019-06-12 | 2019-06-12 | Spontaneous combustion testing device |
| JP2019-109849 | 2019-06-12 |
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| CN112083027A true CN112083027A (en) | 2020-12-15 |
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| CN202010242369.9A Withdrawn CN112083027A (en) | 2019-06-12 | 2020-03-31 | Spontaneous combustion test device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112083038A (en) * | 2019-06-12 | 2020-12-15 | 株式会社岛津制作所 | Spontaneous combustion test device |
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| CN102928457A (en) * | 2012-10-15 | 2013-02-13 | 中国石油化工股份有限公司 | Experimental facility for testing autoignition temperature of gas in high-pressure oxygen-enriched environment |
| CN103063700A (en) * | 2012-11-06 | 2013-04-24 | 广东电网公司电力科学研究院 | System and method for synchronously measuring apparent thermophysical property and autoignition temperature of combustible particles |
| CN104502398A (en) * | 2014-12-15 | 2015-04-08 | 中国石油天然气股份有限公司 | High-temperature high-pressure crude oil ignition point testing device and testing method |
| CN105806890A (en) * | 2016-03-26 | 2016-07-27 | 河南理工大学 | Coal spontaneous combustion characteristic parameter measuring device based on load pressurizing mode |
| CN107941852A (en) * | 2017-11-14 | 2018-04-20 | 中国矿业大学 | The synchronous contrast measurement system and assay method of a kind of coal spontaneous combustion diverse characteristics parameter |
| CN112083026A (en) * | 2019-06-12 | 2020-12-15 | 株式会社岛津制作所 | Spontaneous combustion test device |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112083038A (en) * | 2019-06-12 | 2020-12-15 | 株式会社岛津制作所 | Spontaneous combustion test device |
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| JP2020201195A (en) | 2020-12-17 |
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