CN112326732A - Device and method for measuring flash point of combustible liquid at constant pressure - Google Patents
Device and method for measuring flash point of combustible liquid at constant pressure Download PDFInfo
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- CN112326732A CN112326732A CN202011244240.8A CN202011244240A CN112326732A CN 112326732 A CN112326732 A CN 112326732A CN 202011244240 A CN202011244240 A CN 202011244240A CN 112326732 A CN112326732 A CN 112326732A
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- box body
- pressure
- flash point
- electromagnetic valve
- combustible liquid
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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
Abstract
The invention discloses a device and a method for measuring a flash point of combustible liquid at constant pressure, wherein the device comprises a box body, a flash point measuring unit, a first adjusting unit, a second adjusting unit and a third adjusting unit; the flash point measuring unit is positioned in the box body; the first adjusting unit comprises a gas flowmeter, a first electromagnetic valve and a gas inlet which are sequentially connected, and the gas flowmeter is communicated with the box body; the second adjusting unit comprises a pressure sensor, a second electromagnetic valve and an exhaust port which are sequentially connected, and the pressure sensor is also communicated with the box body; the third adjusting unit comprises a third electromagnetic valve and an air cylinder which are sequentially connected, and the third electromagnetic valve is also communicated with the box body. The invention can realize the accurate detection of the flash point of the combustible liquid under constant pressure, and avoid the influence of atmospheric pressure during the measurement of the flash point of the combustible liquid in the prior art.
Description
Technical Field
The invention belongs to the technical field of power equipment detection, and particularly relates to a device and a method for measuring a flash point of a combustible liquid at constant voltage.
Background
The flash point is the temperature at which the material or article, when in contact with the flame, forms a mixture with the ambient air, flashes and burns immediately. For combustible liquids, the flash point is important information that guides the links of use, storage, transportation, etc. of combustible liquids. The existing flash point measuring method is that combustible liquid is heated to a certain temperature, steam generated by heating is ignited, then temperature rise ignition is continued until the surface of the combustible liquid is immediately combusted after the flash fire occurs, and the recorded temperature is the flash point value. The atmospheric pressure during measurement directly determines the testing value of the flash point of the combustible liquid, and the flash point value of the combustible liquid is difficult to accurately detect due to obvious changes of the atmospheric pressure in different regions and different testing time, thereby influencing the implementation schemes of subsequent use links.
Disclosure of Invention
Aiming at the problems, the invention provides a device and a method for measuring the flash point of combustible liquid at constant pressure, which can realize the accurate detection of the flash point of the combustible liquid at constant pressure and avoid the influence of atmospheric pressure during the measurement of the flash point of the combustible liquid in the prior art.
In order to achieve the technical purpose and achieve the technical effects, the invention is realized by the following technical scheme:
in a first aspect, the present invention provides a device for the constant pressure determination of the flash point of a flammable liquid, comprising:
a box body;
the flash point measuring unit is positioned inside the box body;
the first adjusting unit comprises a gas flowmeter, a first electromagnetic valve and a gas inlet which are sequentially connected, and the gas flowmeter is also communicated with the box body;
the second adjusting unit comprises a pressure sensor, a second electromagnetic valve and an exhaust port which are sequentially connected, and the pressure sensor is also communicated with the box body;
and the third adjusting unit comprises a third electromagnetic valve and an air cylinder which are sequentially connected, and the third electromagnetic valve is also communicated with the box body.
Optionally, the device of flammable liquid flash point of constant voltage survey still includes steady airflow unit, steady airflow unit locates in the box, and the parcel is in the flash point measuring unit outside for the protection enters into the airflow velocity of flow in the flash point measuring unit and is less than the settlement threshold value.
Optionally, the airflow stabilizing unit is a metal mesh enclosure, and the aperture of the through hole on the metal mesh enclosure is smaller than a set threshold.
Optionally, when the first electromagnetic valve, the second electromagnetic valve and the third electromagnetic valve are all closed, the box body is of a closed structure; when the environmental pressure in the box body is lower than the target pressure required by the combustible liquid flash point measurement, gas is input into the box body through the first adjusting unit, the environmental pressure in the box body is increased until the environmental pressure in the box body meets the required target pressure, and the environmental pressure is kept constant.
Optionally, when the first electromagnetic valve, the second electromagnetic valve and the third electromagnetic valve are all closed, the box body is of a closed structure; when the environmental pressure in the box body is higher than the target pressure required by the combustible liquid flash point measurement, the gas in the box body is output through the second adjusting unit, the environmental pressure in the box body is reduced until the environmental pressure in the box body meets the required target pressure, and the environmental pressure is kept constant.
Optionally, the cylinder has a space volume enough to meet the test requirement, a piston is arranged in the cylinder, and when the environmental pressure in the box body is higher than the target pressure required by the combustible liquid flash point measurement, a pulling force is applied to the piston, so that the volume in the cylinder is increased, the environmental pressure in the box body is reduced until the environmental pressure in the box body meets the required target pressure, and the environmental pressure is kept constant.
In a second aspect, the present invention provides a method for determining the flash point of a combustible liquid at constant pressure, comprising:
detecting the environmental pressure inside the box body, wherein a flash point measuring unit is arranged in the box body;
and controlling the first adjusting unit, the second adjusting unit and the third adjusting unit based on the internal ambient pressure of the box body and a preset control strategy, so that the ambient pressure in the box body meets the required target pressure and keeps constant.
Optionally, the first adjusting unit comprises a gas flowmeter, a first electromagnetic valve and a gas inlet which are connected in sequence, and the gas flowmeter is also communicated with the box body; the second adjusting unit comprises a pressure sensor, a second electromagnetic valve and an exhaust port which are sequentially connected, and the pressure sensor is also communicated with the box body; the third adjusting unit comprises a third electromagnetic valve and an air cylinder which are sequentially connected, and the third electromagnetic valve is also communicated with the box body.
Optionally, when the first electromagnetic valve, the second electromagnetic valve and the third electromagnetic valve are all closed, the box body is of a closed structure; when the environmental pressure in the box body is lower than the target pressure required by the combustible liquid flash point measurement, gas is input into the box body through the first adjusting unit, the environmental pressure in the box body is increased until the environmental pressure in the box body meets the required target pressure, and the environmental pressure is kept constant.
Optionally, when the first electromagnetic valve, the second electromagnetic valve and the third electromagnetic valve are all closed, the box body is of a closed structure; when the environmental pressure in the box body is higher than the target pressure required by the combustible liquid flash point measurement, the gas in the box body is output through the second adjusting unit, the environmental pressure in the box body is reduced until the environmental pressure in the box body meets the required target pressure, and the environmental pressure is kept constant.
Optionally, the cylinder has a space volume enough to meet the test requirement, a piston is arranged in the cylinder, and when the environmental pressure in the box body is higher than the target pressure required by the combustible liquid flash point measurement, a pulling force is applied to the piston, so that the volume in the cylinder is increased, the environmental pressure in the box body is reduced until the environmental pressure in the box body meets the required target pressure, and the environmental pressure is kept constant.
Compared with the prior art, the invention has the beneficial effects that:
(1) the device and the method for measuring the flash point of the combustible liquid at constant pressure can avoid the interference of the environmental pressure on the flash point measured value during the test and reduce the test error.
(2) The invention provides the air flow stabilizing device which can effectively prevent the interference of air flow on the flash point test and further improve the accuracy of the flash point measurement.
(3) The invention provides a pressure regulating scheme during flash point measurement, and the pressure to be measured can be increased and decreased according to the actual working requirement to obtain the flash point value of the target pressure, thereby having important significance for better guiding the use of combustible liquid.
Drawings
In order that the present disclosure may be more readily and clearly understood, reference is now made to the following detailed description of the present disclosure taken in conjunction with the accompanying drawings, in which:
FIG. 1 is a schematic structural diagram of an apparatus for determining a flash point of a combustible liquid at constant pressure according to an embodiment of the present invention.
The meanings of the symbols in the figures:
1-flash point measuring unit, 2-steady airflow unit, 3-pressure regulating unit, 4-air inlet, 5-gas flowmeter, 6-pressure sensor, 7-second electromagnetic valve, 8-air outlet, 9-cylinder, 10-first electromagnetic valve, 11-third electromagnetic valve.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and do not limit the scope of the invention.
The following detailed description of the principles of the invention is provided in connection with the accompanying drawings.
The method aims to solve the problem that in the prior art, the change of atmospheric pressure in different areas and different test times is obvious, so that the flash point value of the combustible liquid is difficult to accurately detect, and the implementation scheme of each subsequent use link is influenced. The invention provides a device and a method for determining a flash point of combustible liquid at constant pressure.
Example 1
As shown in fig. 1, in an embodiment of the present invention, there is provided an apparatus for determining a flash point of a flammable liquid at a constant pressure, including:
a box body 3;
a flash point measuring unit 1 located inside the case 3; the structure and the measurement principle of the flash point measurement unit 1 can be realized by adopting the prior art, so that the invention is not described in detail;
the first adjusting unit comprises a gas flowmeter 5, a first electromagnetic valve 10 and a gas inlet 4 which are sequentially connected, and the gas flowmeter 5 is also communicated with the box body 3; the gas flow meter 5 is used for realizing the control of the flow rate of the intake air;
the second adjusting unit comprises a pressure sensor 6, a second electromagnetic valve 7 and an exhaust port 8 which are sequentially connected, and the pressure sensor 6 is also communicated with the box body 3;
and the third adjusting unit comprises a third electromagnetic valve 11 and an air cylinder 9 which are sequentially connected, and the third electromagnetic valve 11 is also communicated with the box body 3.
In a specific implementation manner of the embodiment of the present invention, the device for determining a flash point of a combustible liquid at a constant pressure further includes an airflow stabilizing unit 2, and the airflow stabilizing unit 2 is disposed in the box body 3, and is wrapped outside the flash point measuring unit 1, and is used for protecting an airflow flowing into the flash point measuring unit 1 from being smaller than a set threshold. In a specific implementation manner of the embodiment of the present invention, the airflow stabilizing unit 2 is a metal mesh enclosure, and a hole diameter of a through hole on the metal mesh enclosure is smaller than a set threshold, so as to protect the flash point measuring unit 1 and avoid generating excessive airflow to interfere with heating.
In a specific implementation manner of the embodiment of the present invention, when the first solenoid valve 10, the second solenoid valve 7 and the third solenoid valve 11 are all closed, the tank 3 is of a closed structure; when the environmental pressure in the box body 3 is lower than the target pressure required by the combustible liquid flash point measurement, gas is input into the box body 3 through the first adjusting unit, and the environmental pressure in the box body 3 is increased until the environmental pressure in the box body 3 meets the required target pressure and is kept constant.
In a second specific implementation manner of the embodiment of the present invention, when the first solenoid valve 10, the second solenoid valve 7 and the third solenoid valve 11 are all closed, the tank 3 is of a closed structure; when the environmental pressure in the box body 3 is higher than the target pressure required by the combustible liquid flash point measurement, the gas in the box body 3 is output through the second adjusting unit, and the environmental pressure in the box body 3 is reduced until the environmental pressure in the box body 3 meets the required target pressure and is kept constant.
In a third embodiment of the present invention, the cylinder 9 has a space volume sufficient to meet the test requirements, a piston is disposed in the cylinder 9, and when the ambient pressure in the tank 3 is higher than the target pressure required for measuring the flash point of the combustible liquid, a pulling force is applied to the piston to increase the volume in the cylinder and reduce the ambient pressure in the tank 3 until the ambient pressure in the tank 3 meets the target pressure and is kept constant.
The operation of the apparatus of the present invention will be described in detail with reference to a specific embodiment.
Step SS 1: and opening the first electromagnetic valve 10, the second electromagnetic valve 7 and the third electromagnetic valve 11, pushing the piston of the air cylinder 9 to the bottommost end, introducing air from the air inlet 4 at a certain flow rate, discharging the air from the air outlet 8 after the air enters the box body 3, and keeping the air for 30 seconds, wherein the ambient pressure inside the box body 3 and the air stabilizing unit 2 is the same as the atmospheric pressure. If the target pressure required by the measurement of the flash point of the combustible liquid is higher than the environmental pressure, closing the second electromagnetic valve 7 and the third electromagnetic valve 11, introducing air until the value of the pressure sensor 6 reaches the target pressure, and closing the first electromagnetic valve 10; if the target pressure required by the combustible liquid flash point measurement is smaller than the environmental pressure, the first electromagnetic valve 10 and the second electromagnetic valve 7 are closed, the piston of the cylinder 9 is stretched outwards until the value of the pressure sensor 6 reaches the target pressure, and the third electromagnetic valve 11 is closed.
Step SS 2: when the environmental pressure in the box body is adjusted to the target pressure, the flash point measuring unit 1 is started to start detection, the SS1 step is repeated after ignition every time, the temperature is increased again and ignition is carried out until the flash point value of the combustible liquid is measured.
Example 2
The embodiment of the invention provides a method for measuring a flash point of combustible liquid at constant pressure, which comprises the following steps:
detecting the environmental pressure in a box body 3, wherein a flash point measuring unit 1 is placed in the box body 3;
based on the internal ambient pressure of the tank 3 and a preset control strategy, the first adjusting unit, the second adjusting unit and the third adjusting unit are controlled so that the ambient pressure in the tank 3 meets a required target pressure and is kept constant.
In a specific implementation manner of the embodiment of the present invention, the first adjusting unit includes a gas flowmeter 5, a first electromagnetic valve 10 and an air inlet 4, which are connected in sequence, and the gas flowmeter 5 is further communicated with the box 3; the second adjusting unit comprises a pressure sensor 6, a second electromagnetic valve 7 and an exhaust port 8 which are sequentially connected, and the pressure sensor 6 is also communicated with the box body 3; the third adjusting unit comprises a third electromagnetic valve 11 and an air cylinder 9 which are sequentially connected, and the third electromagnetic valve 11 is also communicated with the box body 3.
In a specific implementation manner of the embodiment of the present invention, when the first solenoid valve 10, the second solenoid valve 7 and the third solenoid valve 11 are all closed, the tank 3 is of a closed structure; when the environmental pressure in the box body 3 is lower than the target pressure required by the combustible liquid flash point measurement, gas is input into the box body 3 through the first adjusting unit, and the environmental pressure in the box body 3 is increased until the environmental pressure in the box body 3 meets the required target pressure and is kept constant.
In a second specific implementation manner of the embodiment of the present invention, when the first solenoid valve 10, the second solenoid valve 7 and the third solenoid valve 11 are all closed, the tank 3 is of a closed structure; when the environmental pressure in the box body 3 is higher than the target pressure required by the combustible liquid flash point measurement, the gas in the box body 3 is output through the second adjusting unit, and the environmental pressure in the box body 3 is reduced until the environmental pressure in the box body 3 meets the required target pressure and is kept constant.
In a third embodiment of the invention, the cylinder (9) has a space volume sufficient to meet the test requirements, a piston is arranged in the cylinder (9), when the ambient pressure in the box body (3) is higher than the target pressure required by the flash point measurement of the combustible liquid, a pulling force is applied to the piston, the volume in the cylinder is increased, and the ambient pressure in the box body (3) is reduced until the ambient pressure in the box body (3) meets the required target pressure and is kept constant.
The method in the embodiment of the present invention can be implemented based on the apparatus for determining the flash point of combustible liquid at constant pressure in embodiment 1.
The foregoing shows and describes the general principles and broad features of the present invention and advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (11)
1. An apparatus for the constant pressure determination of the flash point of a combustible liquid, comprising:
a box body (3);
a flash point measuring unit (1) located inside the box (3);
the first adjusting unit comprises a gas flowmeter (5), a first electromagnetic valve (10) and a gas inlet (4) which are sequentially connected, and the gas flowmeter (5) is also communicated with the box body (3);
the second adjusting unit comprises a pressure sensor (6), a second electromagnetic valve (7) and an exhaust port (8) which are sequentially connected, and the pressure sensor (6) is also communicated with the box body (3);
and the third adjusting unit comprises a third electromagnetic valve (11) and an air cylinder (9) which are sequentially connected, and the third electromagnetic valve (11) is also communicated with the box body (3).
2. The apparatus for the constant pressure measurement of the flash point of a combustible liquid according to claim 1, wherein: the device of flammable liquid flash point of constant voltage survey is still including steady airflow unit (2), steady airflow unit (2) are located in box (3), and the parcel is in flash point measuring unit (1) outside for the protection enters into the airflow velocity of flow of flash point measuring unit in (1) and is less than the settlement threshold value.
3. The apparatus for the constant pressure measurement of the flash point of a combustible liquid according to claim 2, wherein: the air flow stabilizing unit (2) is a metal net cover, and the aperture of a through hole in the metal net cover is smaller than a set threshold value.
4. The apparatus for the constant pressure measurement of the flash point of a combustible liquid according to claim 1, wherein: when the first electromagnetic valve (10), the second electromagnetic valve (7) and the third electromagnetic valve (11) are closed, the box body (3) is of a closed structure; when the environmental pressure in the box body (3) is lower than the target pressure required by the combustible liquid flash point measurement, gas is input into the box body (3) through the first adjusting unit, and the environmental pressure in the box body (3) is increased until the environmental pressure in the box body (3) meets the required target pressure and is kept constant.
5. The apparatus for the constant pressure measurement of the flash point of a combustible liquid according to claim 1, wherein: when the first electromagnetic valve (10), the second electromagnetic valve (7) and the third electromagnetic valve (11) are closed, the box body (3) is of a closed structure; when the environmental pressure in the box body (3) is higher than the target pressure required by the combustible liquid flash point measurement, the gas in the box body (3) is output through the second adjusting unit, and the environmental pressure in the box body (3) is reduced until the environmental pressure in the box body (3) meets the required target pressure and is kept constant.
6. The apparatus for the constant pressure measurement of the flash point of a combustible liquid according to claim 1, wherein: the air cylinder (9) has a space volume enough to meet the test requirement, a piston is arranged in the air cylinder (9), when the environmental pressure in the box body (3) is higher than the target pressure required by the combustible liquid flash point measurement, pulling force is applied to the piston, the volume in the air cylinder is increased, and the environmental pressure in the box body (3) is reduced until the environmental pressure in the box body (3) meets the required target pressure and is kept constant.
7. A method for determining the flash point of a combustible liquid at constant pressure, comprising:
detecting the environmental pressure in the box body (3), wherein a flash point measuring unit (1) is arranged in the box body (3);
and controlling the first regulating unit, the second regulating unit and the third regulating unit based on the internal ambient pressure of the box body (3) and a preset control strategy, so that the ambient pressure in the box body (3) meets a required target pressure and is kept constant.
8. The method for the constant pressure determination of the flash point of a combustible liquid according to claim 7, wherein the first regulating unit comprises a gas flow meter (5), a first electromagnetic valve (10) and a gas inlet (4) which are connected in sequence, and the gas flow meter (5) is also communicated with the box body (3); the second adjusting unit comprises a pressure sensor (6), a second electromagnetic valve (7) and an exhaust port (8) which are sequentially connected, and the pressure sensor (6) is also communicated with the box body (3); the third adjusting unit comprises a third electromagnetic valve (11) and an air cylinder (9) which are sequentially connected, and the third electromagnetic valve (11) is also communicated with the box body (3).
9. The method for the constant-pressure determination of the flash point of a combustible liquid according to claim 8, wherein when the first solenoid valve (10), the second solenoid valve (7) and the third solenoid valve (11) are all closed, the tank (3) is of a closed structure; when the environmental pressure in the box body (3) is lower than the target pressure required by the combustible liquid flash point measurement, gas is input into the box body (3) through the first adjusting unit, and the environmental pressure in the box body (3) is increased until the environmental pressure in the box body (3) meets the required target pressure and is kept constant.
10. The method for the constant-pressure determination of the flash point of a combustible liquid according to claim 8, wherein when the first solenoid valve (10), the second solenoid valve (7) and the third solenoid valve (11) are all closed, the tank (3) is of a closed structure; when the environmental pressure in the box body (3) is higher than the target pressure required by the combustible liquid flash point measurement, the gas in the box body (3) is output through the second adjusting unit, and the environmental pressure in the box body (3) is reduced until the environmental pressure in the box body (3) meets the required target pressure and is kept constant.
11. The method for constant pressure determination of the flash point of combustible liquid according to claim 8, wherein the cylinder (9) has a space volume sufficient to satisfy the test requirements, a piston is arranged in the cylinder (9), when the ambient pressure in the box body (3) is higher than the target pressure required for determination of the flash point of combustible liquid, a pulling force is applied to the piston, the volume in the cylinder is increased, and the ambient pressure in the box body (3) is reduced until the ambient pressure in the box body (3) satisfies the target pressure required and is kept constant.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011244240.8A CN112326732A (en) | 2020-11-10 | 2020-11-10 | Device and method for measuring flash point of combustible liquid at constant pressure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011244240.8A CN112326732A (en) | 2020-11-10 | 2020-11-10 | Device and method for measuring flash point of combustible liquid at constant pressure |
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| Publication Number | Publication Date |
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| CN112326732A true CN112326732A (en) | 2021-02-05 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202011244240.8A Pending CN112326732A (en) | 2020-11-10 | 2020-11-10 | Device and method for measuring flash point of combustible liquid at constant pressure |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113009066A (en) * | 2021-02-22 | 2021-06-22 | 国网陕西省电力公司电力科学研究院 | Gas combustibility on-line monitoring device and method in gas collection box |
-
2020
- 2020-11-10 CN CN202011244240.8A patent/CN112326732A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113009066A (en) * | 2021-02-22 | 2021-06-22 | 国网陕西省电力公司电力科学研究院 | Gas combustibility on-line monitoring device and method in gas collection box |
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