CN112067659A - Test device for testing high-pressure flash point of flammable liquid - Google Patents
Test device for testing high-pressure flash point of flammable liquid Download PDFInfo
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- CN112067659A CN112067659A CN202011121172.6A CN202011121172A CN112067659A CN 112067659 A CN112067659 A CN 112067659A CN 202011121172 A CN202011121172 A CN 202011121172A CN 112067659 A CN112067659 A CN 112067659A
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- 238000012360 testing method Methods 0.000 title claims abstract description 81
- 239000007788 liquid Substances 0.000 title claims abstract description 39
- 238000005485 electric heating Methods 0.000 claims abstract description 19
- 239000000446 fuel Substances 0.000 claims abstract description 19
- 238000010892 electric spark Methods 0.000 claims abstract description 11
- 238000010438 heat treatment Methods 0.000 claims abstract description 10
- 230000003068 static effect Effects 0.000 claims description 8
- 238000007789 sealing Methods 0.000 claims description 7
- 238000005260 corrosion Methods 0.000 abstract description 4
- 230000007797 corrosion Effects 0.000 abstract description 4
- 239000000463 material Substances 0.000 abstract description 2
- 239000007789 gas Substances 0.000 description 12
- 239000000126 substance Substances 0.000 description 6
- 238000000034 method Methods 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000011010 flushing procedure Methods 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 238000011410 subtraction method Methods 0.000 description 1
- 238000005303 weighing 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
- G01N25/50—Investigating or analyzing materials by the use of thermal means by investigating flash-point; by investigating explosibility
- G01N25/52—Investigating or analyzing materials by the use of thermal means by investigating flash-point; by investigating explosibility by determining flash-point of liquids
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- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
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- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Or Analyzing Materials Using Thermal Means (AREA)
Abstract
The invention discloses a test device for testing a high-pressure flash point of flammable liquid, which comprises a sealed pressure-resistant container, a sample pool, a high-pressure electric spark igniter, an air compressor, a temperature controller, an electric heating ring and a thermocouple, wherein the sample pool is arranged in the sealed pressure-resistant container, and the high-pressure electric spark igniter is used for providing open fire for a liquid fuel sample to be tested in the sample pool; the air compressor is communicated with the inside of the pressure-resistant sealed container through a gas pipeline, the thermocouple is positioned in the pressure-resistant sealed container, the electric heating ring is used for heating the inner cavity of the pressure-resistant sealed container, and the electric heating ring and the thermocouple are electrically connected with the temperature controller. The problem of liquid fuel's flash point test under the high-pressure condition is solved, the flash point of material under the testable high-pressure environment, easy operation, withstand voltage corrosion resistance is good, and the precision is high, and the security is high, and is visible good.
Description
Technical Field
The invention relates to the technical field of liquid fuel flash point tests, in particular to a test device for testing a high-pressure flash point of flammable liquid.
Background
The flash point, also known as the ignition point, is the temperature at which the material is heated to begin to flash from a flame under specified conditions. The flash point of a substance is mainly related to the evaporation property of the substance; the lighter the fraction, the more readily it evaporates, the lower the flash point. The lower the flash point of a substance, the more easily it is ignited by a flame to cause combustion, and the greater the risk of fire. Therefore, the flash point can be seen as a fire safety indicator. The various liquids are flammable or combustible, and are grouped according to their flash points.
With the continuous development of aerospace science and technology and modern transportation, the safety requirement of energy fuel is higher and higher. The liquid fuel is required to be tested for flash point according to the use safety of the liquid fuel in a sealed or high-pressure sealed state.
The existing flash point testing technology and equipment for liquid fuel are in a normal pressure testing state. The method comprises normal pressure closed cup flash point test and normal pressure open cup flash point test. Since the saturated vapor pressure of the liquid fuel is affected by the ambient pressure, the conventional apparatus cannot estimate the flash point of the liquid fuel under a high pressure condition.
Disclosure of Invention
The invention aims to provide a test device for testing the high-pressure flash point of flammable liquid, which is used for solving the problems in the prior art, can test the flash point of a substance in a high-pressure environment, and has the advantages of simple operation, good pressure resistance and corrosion resistance, high precision, high safety and good visibility.
In order to achieve the purpose, the invention provides the following scheme: the invention provides a test device for testing a high-pressure flash point of flammable liquid, which comprises a sealed pressure-resistant container, a sample pool, a high-pressure electric spark igniter, an air compressor, a temperature controller, an electric heating ring and a thermocouple, wherein the sample pool is arranged in the sealed pressure-resistant container, and the high-pressure electric spark igniter is used for providing open fire for a liquid fuel sample to be tested in the sample pool; the air compressor is communicated with the inside of the pressure-resistant sealed container through a gas pipeline, the thermocouple is positioned in a test sample in the pressure-resistant sealed container, the electric heating ring is used for heating an inner cavity of the pressure-resistant sealed container, and the electric heating ring and the thermocouple are electrically connected with the temperature controller.
Preferably, the sealed pressure-resistant container comprises an end cover and a tank body, the end cover with a conical section is matched and sealed at the top of the tank body, and a sealing gasket is arranged at the sealing position of the end cover and the tank body.
Preferably, one end of the thermocouple is positioned in the test sample in the sealed pressure-resistant container, and the other end of the thermocouple is electrically connected with the temperature controller; the temperature controller is used for controlling the heating on-off and power of the electric heating ring.
Preferably, the air compressor is a diaphragm compressor.
Preferably, an air inlet valve is arranged on a gas pipeline of the diaphragm compressor communicated with the sealed pressure-resistant container.
Preferably, an exhaust pipeline is further connected to the gas pipeline, and an exhaust valve is arranged on the exhaust pipeline.
Preferably, a static pressure sensor is arranged on the gas pipeline, and the static pressure sensor is in signal connection with the pressure acquisition and display.
Preferably, the test device further comprises an observation window, wherein the observation window is made of bulletproof glass embedded into the wall surface of the sealed pressure-resistant container, a high-speed video recorder is erected outside the observation window, and the high-speed video recorder is used for recording test phenomena in the sealed pressure-resistant container during test ignition.
Compared with the prior art, the invention has the following beneficial technical effects:
the test device for testing the high-pressure flash point of the flammable liquid solves the problem of testing the flash point of the liquid fuel under a high-pressure state. Designing a high-pressure sealed container, flushing high pressure into the sealed container by using an air compressor, heating a sample cell by using an electric heating wire, and testing the flash point of a sample by igniting high-pressure electric sparks. The device can test the flash point of a substance in a high-pressure environment, and has the advantages of simple operation, good pressure resistance and corrosion resistance, high precision, high safety and good visibility.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
FIG. 1 is a schematic diagram of the overall structure of a testing device for testing the high-pressure flash point of a flammable liquid;
wherein, 1, end cap; 2, a thermocouple; 3 high voltage spark igniter; 4, a sample cell; 5 liquid fuel sample; 6, electrically heating a ring; 7 a static pressure sensor; 8 an air inlet valve; 9 an exhaust valve; 10 an observation window; 11, a tank body; 12 a diaphragm compressor; 13 a pressure acquisition and display; 14 temperature controller.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention aims to provide a test device for testing the high-pressure flash point of flammable liquid, which is used for solving the problems in the prior art, can test the flash point of a substance in a high-pressure environment, and has the advantages of simple operation, good pressure resistance and corrosion resistance, high precision, high safety and good visibility.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
As shown in fig. 1-the present embodiment provides a testing apparatus for testing a high-pressure flash point of a flammable liquid, comprising a sealed pressure-resistant container, a sample cell 4, a high-pressure electric spark igniter 3, an air compressor, a temperature controller 14, an electric heating ring 6 and a thermocouple 2, wherein the sample cell 4 is disposed in the sealed pressure-resistant container, and the high-pressure electric spark igniter 3 is used for providing an open fire for a liquid fuel sample 5 to be tested in the sample cell 4; the air compressor is communicated with the inside of the pressure-resistant sealed container through a gas pipeline, the thermocouple 2 is positioned in a test sample in the pressure-resistant sealed container, the electric heating ring 6 is used for heating an inner cavity of the pressure-resistant sealed container, and the electric heating ring 6 and the thermocouple 2 are electrically connected with the temperature controller 14. Designing a high-pressure sealed container, flushing high pressure into the sealed container by using an air compressor, heating the sample cell 4 by using an electric heating wire, and testing the flash point of the sample by igniting high-pressure electric sparks.
Further, the sealed pressure-resistant container comprises an end cover 1 and a tank body 11, wherein the end cover 1 with a conical section is matched and sealed at the top of the tank body 11, and a sealing gasket is arranged at the sealing position of the end cover 1 and the tank body 11; the end cover 1 and the tank body 11 are both made of stainless steel.
One end of the thermocouple 2 is positioned in the sealed pressure-resistant container, and the other end is electrically connected with the temperature controller 14; the thermocouple 2 is used for testing the temperature of the test sample in the pressure resistant container, and the electric heating ring 6 can heat the temperature in the cavity of the pressure resistant container. The temperature controller 14 controls the heating on-off and power of the electric heating ring 6 by setting temperature or temperature curve and comparing with the temperature signal collected and recorded by the thermocouple 2, thereby achieving the temperature control in the pressure vessel.
The high-voltage electric spark igniter 3 is used for providing an open fire above the sample pool 4 and testing whether the sample reaches the flash point temperature. In this embodiment, the air compressor is a diaphragm compressor 12, and the high-pressure gas provided by the diaphragm compressor 12 is filled into the pressure-resistant container to provide a high-pressure environment for the test.
An air inlet valve 8 is arranged on a gas pipeline communicated with the sealed pressure-resistant container by the diaphragm compressor 12; the gas pipeline is also connected with an exhaust pipeline, and an exhaust valve 9 is arranged on the exhaust pipeline and used for exhausting high-pressure gas of the pressure container after the test; the tail end of the exhaust pipeline can be connected with a vacuum pump for vacuumizing in the pressure container before the test.
The gas pipeline is provided with a static pressure sensor 7, and the static pressure sensor 7 is in signal connection with a pressure acquisition and display 13 and can be used for acquiring the static pressure in the test system.
In this embodiment, the testing apparatus for testing the high-pressure flash point of the flammable liquid further includes an observation window 10, the observation window 10 is a bulletproof glass embedded in the wall surface of the sealed pressure-resistant container, a high-speed video recorder is installed outside the observation window 10, and the high-speed video recorder is used for recording the test phenomenon in the sealed pressure-resistant container during the test ignition.
The test device for testing the high-pressure flash point of the flammable liquid has the working process as follows:
a, mounting and connecting test equipment, testing whether the pressure resistance and the sealing of the tank body 11 and the sealed pressure-resistant container are good or not, ensuring that no equipment is abnormal, and performing a formal test after a test system has no air leakage.
B, opening the end cover 1 of the tank body 11 and taking the sample pool 4 out.
And C, adding a certain amount of liquid fuel sample 5 into the sample cell 4 by adopting a subtraction method, and adding the liquid fuel sample to the test scale mark inside the sample cell 4. Record the sample mass as m0。
And D, placing the sample cell 4 containing the sample into the tank body 11 and fixing. The end cap 1 is mounted to the can 11 and secured.
E closes the exhaust valve 9, opens the intake valve 8, and uses the diaphragm compressor 12 to flush the test system with high pressure gas (typically air or nitrogen) to provide a high pressure test environment. The static pressure sensor 7 is observed and the pressure data at the pressure acquisition and display 13 is read, the diaphragm compressor 12 is closed after the test pressure is reached and the air inlet valve 8 is closed.
F, setting a temperature-raising program through the temperature controller 14, and controlling the electric heating coil 6 inside the cavity to heat the liquid fuel in the sample cell 4.
G continuously igniting the fraction above the liquid fuel by means of a high voltage spark igniter 3 and observing whether the sample fraction is ignited or not by means of a high speed video recorder through an observation window 10. Thereby determining the flash point value of the liquid fuel sample at this pressure.
After the H test, the vent valve 9 is opened to vent the high pressure gas in the test system.
I, disassembling the end cover 1 of the pressure container tank body 11, taking out the sample pool 4, observing the phenomenon of the tested sample, photographing and recording, weighing the sample amount m after the test, and calculating the sample reaction amount delta m which is m-m0。
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein, and any reference signs in the claims are not intended to be construed as limiting the claim concerned.
The principle and the implementation mode of the invention are explained by applying a specific example, and the description of the embodiment is only used for helping to understand the method and the core idea of the invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.
Claims (8)
1. The utility model provides a test device of test flammable liquid high pressure flash point which characterized in that: the device comprises a sealed pressure-resistant container, a sample cell, a high-voltage electric spark igniter, an air compressor, a temperature controller, an electric heating ring and a thermocouple, wherein the sample cell is arranged in the sealed pressure-resistant container, and the high-voltage electric spark igniter is used for providing open fire for a liquid fuel sample to be detected in the sample cell; the air compressor is communicated with the inside of the pressure-resistant sealed container through a gas pipeline, the thermocouple is positioned in the pressure-resistant sealed container, the electric heating ring is used for heating an inner cavity of the pressure-resistant sealed container, and the electric heating ring and the thermocouple are electrically connected with the temperature controller.
2. The test apparatus for testing the high pressure flash point of a flammable liquid according to claim 1, wherein: the sealed pressure-resistant container comprises an end cover and a tank body, wherein the end cover with a conical section is matched and sealed at the top of the tank body, and a sealing gasket is arranged at the sealing position of the end cover and the tank body.
3. The test apparatus for testing the high pressure flash point of a flammable liquid according to claim 1, wherein: one end of the thermocouple is positioned in the test sample in the sealed pressure-resistant container, and the other end of the thermocouple is electrically connected with the temperature controller; the temperature controller is used for controlling the heating on-off and power of the electric heating ring.
4. The test apparatus for testing the high pressure flash point of a flammable liquid according to claim 1, wherein: the air compressor is a diaphragm compressor.
5. The test device for testing the high pressure flash point of flammable liquids of claim 4, wherein: and an air inlet valve is arranged on a gas pipeline communicated with the sealed pressure-resistant container by the diaphragm compressor.
6. The test apparatus for testing the high pressure flash point of a flammable liquid according to claim 5, wherein: still be connected with an exhaust pipe on the gas pipeline, be provided with discharge valve on the exhaust pipe way.
7. The test apparatus for testing the high pressure flash point of a flammable liquid according to claim 1, wherein: and a static pressure sensor is arranged on the gas pipeline and is in signal connection with the pressure acquisition and display.
8. The test apparatus for testing the high pressure flash point of a flammable liquid according to claim 1, wherein: the high-speed video recorder is used for recording test phenomena in the sealed pressure-resistant container during test ignition.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011121172.6A CN112067659A (en) | 2020-10-20 | 2020-10-20 | Test device for testing high-pressure flash point of flammable liquid |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011121172.6A CN112067659A (en) | 2020-10-20 | 2020-10-20 | Test device for testing high-pressure flash point of flammable liquid |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112083040A (en) * | 2020-10-20 | 2020-12-15 | 南京理工大学 | Method for testing flash point of flammable liquid under high-pressure environment |
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