CN219871190U - A platform for measuring the fire spread characteristics of liquid fuels - Google Patents
A platform for measuring the fire spread characteristics of liquid fuels Download PDFInfo
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- CN219871190U CN219871190U CN202320288670.2U CN202320288670U CN219871190U CN 219871190 U CN219871190 U CN 219871190U CN 202320288670 U CN202320288670 U CN 202320288670U CN 219871190 U CN219871190 U CN 219871190U
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- flame
- temperature
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- 239000000446 fuel Substances 0.000 title claims abstract description 85
- 239000007788 liquid Substances 0.000 title claims abstract description 81
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 67
- 239000001301 oxygen Substances 0.000 claims abstract description 67
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 67
- 238000005259 measurement Methods 0.000 claims abstract description 35
- 239000007789 gas Substances 0.000 claims abstract description 25
- 238000003892 spreading Methods 0.000 claims abstract description 23
- 230000007480 spreading Effects 0.000 claims abstract description 23
- 230000005855 radiation Effects 0.000 claims abstract description 14
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 40
- 238000010438 heat treatment Methods 0.000 claims description 32
- 229910052757 nitrogen Inorganic materials 0.000 claims description 19
- 239000011521 glass Substances 0.000 claims description 15
- 238000000034 method Methods 0.000 claims description 13
- 230000008569 process Effects 0.000 claims description 11
- 238000009529 body temperature measurement Methods 0.000 claims description 6
- 238000005485 electric heating Methods 0.000 claims description 6
- 238000007789 sealing Methods 0.000 claims description 6
- 238000009434 installation Methods 0.000 claims description 4
- 238000004891 communication Methods 0.000 claims description 2
- 238000012360 testing method Methods 0.000 abstract description 10
- 238000002474 experimental method Methods 0.000 description 19
- 239000000779 smoke Substances 0.000 description 7
- 238000006243 chemical reaction Methods 0.000 description 5
- 238000002485 combustion reaction Methods 0.000 description 5
- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 229910001873 dinitrogen Inorganic materials 0.000 description 2
- 230000009970 fire resistant effect Effects 0.000 description 2
- 239000003063 flame retardant Substances 0.000 description 2
- 230000004907 flux Effects 0.000 description 2
- 239000002828 fuel tank Substances 0.000 description 2
- 239000003517 fume Substances 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 239000003546 flue gas Substances 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000001151 other effect Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 239000002912 waste gas Substances 0.000 description 1
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- Investigating Or Analyzing Materials Using Thermal Means (AREA)
Abstract
The utility model discloses a liquid fuel fire spreading characteristic measurement platform, which comprises: the experimental atmosphere cabin is internally provided with an oil pool, and liquid fuel is contained in the oil pool; a gas supply device which is communicated with the oil pool and supplies oxygen to the oil pool, and the oxygen concentration of the gas supply device is adjustable; an ignition device capable of igniting the liquid fuel in the oil pool; and the data acquisition and control system is used for detecting and recording flame radiation quantity, flame temperature and surface temperature of the liquid fuel in the liquid fuel propagation in the oil pool. By arranging the high-pressure oxygen supply device and the flowmeter, and communicating the high-pressure oxygen supply device with the oil pool and adjusting the oxygen concentration passing through the flowmeter, the oxygen concentration supplied to the oil pool can be changed, so that the liquid fuel fire spreading characteristic test under the oxygen concentration of 21% -99.9% can be performed, and the device has the characteristic of wide test condition range.
Description
Technical Field
The utility model relates to the technical field of liquid fuel performance detection, in particular to a liquid fuel fire spreading characteristic measurement platform.
Background
With the development of economy, a variety of new liquid fuels are produced and widely used in production and life. The combustion of fuels in oxygen-rich environments is particularly applicable to industrial production and even aerospace applications.
With the use of liquid fuels, the safety problems associated with the combustion of fuels in an oxygen-rich environment are also growing, most of which are related to leakage of fuel, unlike liquid fuels in air, in an oxygen-rich environment, certain combustible liquids with higher ignition points are more easily ignited than in the atmosphere, with greater risk and losses than in the atmospheric environment.
Since the previous experimental study usually only focused on the combustion and fire spread characteristics of fuels in atmospheric environments, whereas the combustion and fire spread characteristics of liquid fuels in oxygen-enriched environments are different from those of fuels in atmospheric environments, the previous experimental data and numerical simulation results cannot be fully interpreted and used for analyzing the fire spread characteristics of liquid fuels in non-atmospheric environments.
Therefore, how to measure the fire spread characteristics of liquid fuels at different oxygen concentrations is a technical problem to be solved by those skilled in the art.
Disclosure of Invention
In view of the above, the present utility model provides a fire spread property measurement platform for liquid fuel to realize measurement of fire spread properties of liquid fuel at different oxygen concentrations.
In order to achieve the above purpose, the present utility model provides the following technical solutions:
a liquid fuel fire spread property measurement platform comprising:
the experimental atmosphere cabin is internally provided with an oil pool, and liquid fuel is contained in the oil pool;
a gas supply device which is communicated with the oil pool and supplies oxygen to the oil pool, and the oxygen concentration of the gas supply device is adjustable;
an ignition device capable of igniting the liquid fuel in the oil pool;
and the data acquisition and control system is used for detecting and recording flame radiation quantity, flame temperature and surface temperature of the liquid fuel in the liquid fuel propagation in the oil pool.
Preferably, in the above-mentioned liquid fuel fire propagation property measurement platform, the experimental atmosphere chamber includes:
the bracket is arranged on the upper surface of the bracket,
the oil tank is arranged in the sealed box body, and the sealed box body is provided with an exhaust port communicated with the outside; the ignition device stretches into the sealed box body and is suspended above the oil pool;
the oil tank is a transparent glass oil tank.
Preferably, in the above-mentioned liquid fuel fire spread property measurement platform, the sealed box includes:
the base is fixed on the bracket, and the oil pool is arranged on the base;
the transparent fireproof glass plate is arranged on the support and is in sealing connection with the base to form a box body structure with an opening at the top.
Preferably, in the above-mentioned liquid fuel fire spread property measurement platform, the gas supply device includes:
a high pressure oxygen supply device which is communicated with the oil pool through a first pipeline;
and the flowmeter is arranged on the first pipeline, and the oxygen amount flowing through the flowmeter can be adjusted through the flowmeter.
Preferably, in the above-mentioned liquid fuel fire spread property measurement platform, the gas supply device further includes:
the high-pressure nitrogen supply device is communicated with the oil pool through a second pipeline;
a gas switching valve in communication with both the first conduit and the second conduit; the gas switching valve is communicated with the first pipeline in a first state; and in a second state, is communicated with the second pipeline.
Preferably, in the above-mentioned liquid fuel fire spread property measurement platform, the ignition device includes:
a resistance wire suspended above the oil pool;
the electric heating igniter is electrically connected with the resistance wire and supplies current to the resistance wire;
the ignition control box is electrically connected with the electric heating igniter, and the ignition control box can adjust the current flowing through the electric heating igniter.
Preferably, the liquid fuel fire spread property measurement platform further comprises:
and the heating device is used for heating the liquid fuel in the oil pool.
Preferably, in the above-mentioned liquid fuel fire spread property measurement platform, the heating device includes:
the heating plate is attached to the outer wall of the oil pool;
and the heating controller is connected with the heating plate and used for adjusting the heating temperature of the heating plate.
Preferably, in the above liquid fuel fire spread property measurement platform, the data acquisition and control system includes:
a temperature measurement system that detects a temperature of the flame and a surface temperature of the liquid fuel of the oil pool;
a radiant heat flow sensor that detects an amount of radiation during flame propagation;
the camera device shoots the ignition, spreading process and flame shape of the flame;
and the computer is connected with the temperature measuring system, the radiation heat flow sensor and the camera device.
Preferably, in the above-mentioned liquid fuel fire spread property measurement platform, the temperature measurement system includes:
the first armored K-type thermocouple is used for detecting the flame temperature and is fixed on the wall surface of the experimental atmosphere cabin through a first horizontal bracket;
the second armoured type K thermocouple detects the surface temperature of the liquid fuel, the second armoured type K thermocouple is fixed on the wall surface of the experimental atmosphere cabin through a second horizontal bracket, and the installation height of the first armoured type K thermocouple is higher than that of the second armoured type K thermocouple.
The utility model discloses a liquid fuel fire spreading characteristic measurement platform, which is characterized in that a high-pressure oxygen supply device and a flowmeter are arranged, the high-pressure oxygen supply device is communicated with an oil pool, and the oxygen concentration passing through the flowmeter is regulated, so that the oxygen concentration supplied to the oil pool can be changed, and the liquid fuel fire spreading characteristic test under the oxygen concentration of 21% -99.9% can be performed, and the liquid fuel fire spreading characteristic measurement platform has the characteristic of wide test condition range.
In addition, the liquid fuel fire spreading characteristic measurement platform disclosed by the utility model has other effects as follows:
the nitrogen of the high-pressure nitrogen cylinder can extinguish burning flame after the experiment is completed due to the flame-retardant property, and can be used as an emergency fire extinguishing device to ensure the safety of the liquid fuel in the experiment process of the fire spreading property measuring platform.
Drawings
In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the utility model, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic view of a fire spread characteristic measurement platform for liquid fuel disclosed in an embodiment of the present utility model;
FIG. 2 is a schematic structural view of an experimental atmosphere cabin of a liquid fuel fire spread characteristic measurement platform disclosed in an embodiment of the present utility model;
FIG. 3 is a schematic view of a temperature measuring device of a liquid fuel fire spread characteristic measuring platform according to an embodiment of the present utility model;
wherein,,
a smoke exhaust fan 1, an experiment compartment 2 and an experiment atmosphere cabin 3;
31 is a bracket, 32 is a base, and 33 is a transparent fireproof glass plate;
4 is a high-speed camera;
5 is a high-pressure oxygen cylinder, 6 is a high-pressure nitrogen cylinder, 7 is a flowmeter, and 8 is a conversion valve;
9 is a computer, 10 is a heating controller, 11 is an ignition control box, and 12 is an electrothermal igniter;
13 is a temperature measuring device, 14 is an oil pool, 15 is a radiation heat flow sensor, and 16 is an oxygen concentration sensor;
131 is a first armoured type K thermocouple, 132 is a second armoured type K thermocouple.
Detailed Description
The utility model discloses a liquid fuel fire spreading characteristic measurement platform for measuring the fire spreading characteristics of liquid fuel under different oxygen concentrations.
The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
The terms "first" and "second" are used below for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature.
As shown in fig. 1, the utility model discloses a liquid fuel fire spreading characteristic measurement platform, which comprises an experiment compartment 2, an experiment atmosphere cabin 3, a gas supply device, a smoke exhaust device, an ignition device, a heating device and a data acquisition and control system.
The test compartment 2 is a basic space for measuring the fire spread characteristics of the liquid fuel, and it is understood that the test compartment 2 may be any space, and may be a laboratory.
The experimental atmosphere cabin 3 is located in the middle of the experimental compartment 2 and is placed on the ground. Of course, the laboratory atmosphere chamber 3 may also be located elsewhere in the laboratory compartment 2. The experimental atmosphere chamber 3 in the present utility model is a space for burning liquid fuel, and the specific structure thereof can be referred to in fig. 2, which is not described herein.
The gas supply device includes: a high-pressure oxygen bottle 5, a high-pressure nitrogen bottle 6, a flowmeter 7, a gas conversion valve 8 and a control switch.
Wherein the high-pressure oxygen bottle 5 and the flowmeter 7 are connected through a first pipeline and form an oxygen channel; a second pipe communicating with the high-pressure nitrogen gas cylinder 6 is connected in parallel with the oxygen passage and then connected to the gas switching valve 8. The gas conversion valve 8 is turned to an oxygen channel where the high-pressure oxygen bottle 5 is located when supplying gas, and at the moment, the gas conversion valve 8 is in a first state; the fire is extinguished by switching to the second pipeline in which the high-pressure nitrogen cylinder 6 is located, and the gas switching valve 8 is in the second state.
The high-pressure oxygen bottle 5 in the utility model can adjust the oxygen concentration in the experimental atmosphere cabin 3, and the nitrogen of the high-pressure nitrogen bottle 6 can extinguish burning flame after the experiment is completed due to the flame-retardant property, and of course, the high-pressure oxygen bottle can also be used as an emergency fire extinguishing device to ensure the safety of the liquid fuel in the experimental process of the fire spreading property measuring platform. The high-pressure oxygen bottle 5 in the present utility model is a high-pressure oxygen supply device for supplying oxygen to the liquid fuel in the oil pool, and the high-pressure nitrogen bottle 6 is a high-pressure nitrogen supply device for supplying nitrogen to the experimental atmosphere chamber 3.
It should be noted that the high-pressure oxygen supply device in the present utility model includes, but is not limited to, the high-pressure oxygen bottle 5 described above, and of course, the high-pressure nitrogen supply device includes, but is not limited to, the high-pressure nitrogen bottle 6 described above.
For convenience of control, control switches are respectively arranged on the high-pressure oxygen cylinder 5 and the high-pressure nitrogen cylinder 6 to respectively control the opening and closing of the high-pressure oxygen cylinder 5 and the high-pressure nitrogen cylinder 6.
The flow meter 7 is an electronic flow meter, and the oxygen amount provided by the high-pressure oxygen bottle 5 can be obtained through the electronic flow meter, so that the oxygen amount provided by the high-pressure oxygen bottle 5 can be adjusted according to the oxygen amount obtained by the flow meter 7.
The oxygen concentration provided to the experimental atmosphere cabin 3 in the utility model is adjustable, so that the liquid fuel fire spreading characteristic test under the oxygen concentration of 21% -99.9% can be performed, and the experimental atmosphere cabin has the characteristic of wide test condition range.
The switching valve 8 in the present utility model is an electronic switching valve, and the switching valve 8 and the flowmeter 7 are both connected to a data acquisition and control system.
Oxygen supply in the experiment can be cut off at the end of the experiment or the first time of occurrence of experimental accidents through setting up the change-over valve 8 to a large amount of nitrogen gas that is used for putting out a fire is introduced, effectively puts out the flame in the experiment, has very big promotion to the security of experiment, has also reduced the loss of experimental platform and relevant instrument equipment because experimental misoperation leads to.
The fume extractor's effect is the flue gas in the exhaust experiment compartment 2, and specifically, this fume extractor includes the exhaust passage and is located the exhaust fan 1 of exhaust passage department, and specifically, this exhaust passage intercommunication experiment compartment 2 and external world, through the exhaust passage, can be with the gas exhaust who produces after the burning in the experiment atmosphere cabin 3.
In some embodiments, the smoke evacuation channel is provided at the top of the experimental compartment 2 and opposite to the top of the experimental atmosphere chamber 3, so that the gas generated by the combustion can be easily and rapidly exhausted. Of course, the smoke evacuation channel includes, but is not limited to, the above arrangement, but may be arranged at other positions of the laboratory compartment 2, and may not be particularly limited.
The smoke exhaust fan 1 can be communicated with a data acquisition and control system, and the start and stop of the smoke exhaust fan 1 can be controlled through the data acquisition and control system.
As can be seen in connection with the structure of the experimental atmosphere cabin 3 shown in fig. 2, the experimental atmosphere cabin 3 in the present utility model comprises a bracket 31, a base 32 and a transparent fire-proof glass plate 33. Wherein the support 31 serves as a supporting base for the whole experimental atmosphere chamber 3, in some embodiments the support 31 is four columns arranged in a rectangular shape. The base 32 connects the four posts and forms a rectangular platform between the four posts. The transparent fireproof glass plate 33 is installed above the base 32 and is connected with the four upright posts in sequence to form a rectangular box body structure. In the case of the transparent fire-resistant glass plate 33, which is connected to the base and the column, it is necessary to ensure the tightness of the connection, and alternatively, the sealing connection is realized by means of a sealing element or a sealing glue.
In some embodiments, in order to ensure the sealing in the experimental atmosphere chamber 3 and facilitate the operation of the structure in the experimental atmosphere chamber 3, the top of the transparent fireproof glass plate 33 in the present utility model is detachably sealed with the transparent fireproof glass plate 33, so that a sealed space can be formed in the experimental atmosphere chamber 3. Of course, the experimental atmosphere chamber 3 may also be provided as a box structure without a roof.
It should be noted that the structure of the bracket 31 and the shape of the formed frame may be set according to different needs, for example, the pillars may be arranged in other shapes, and both may be within the scope of protection.
The mounting position of the base 32 on the upright post can be set as required to facilitate the corresponding test operation by the operator.
An oil sump 14 is installed in the experimental atmosphere chamber 3, and the oil sump 14 is a glass oil sump so as to observe flames burned in the oil sump, and in some embodiments, the oil sump 14 may be a rectangular oil sump and have a length of 0.4m. The oil pool 14 is fixed on the base 32 of the experimental atmosphere chamber 3 and is located at the middle position of the base 32.
With continued reference to fig. 2, the heating means comprises a heating plate (not shown) in abutting engagement with the oil sump 14.
The heating plate is connected to the heating controller 10, the heating temperature of the heating plate can be adjusted by the heating controller 10, the fuel in the fuel tank 14 can be preheated by heating the fuel tank 14 by the heating plate, and the preheating temperature is not particularly limited.
The heating of the heating plate can lead the temperature of the liquid fuel to be increased from room temperature to 500 ℃, can measure the fire spreading characteristics of most flammable liquid with the ignition point higher than the room temperature, and is mainly used for measuring the fire spreading characteristic parameters of the flammable liquid with high ignition point.
The ignition device comprises a resistive wire (not shown in the figures). The resistance wire is located above one end of the oil sump 14. In some embodiments, the resistance wire may be suspended above the oil sump 14. In order to ensure that the resistance wire ignites the fuel, the resistance wire may be slightly above the height of the oil sump 14, with the particular height being without limitation.
The electric igniter 12 is electrically connected with the resistance wire, the electric igniter 12 is connected with the ignition control box 11, and the electric current input to the electric igniter 12 is controlled by the ignition control box 11, so that the electric current of the resistance wire is changed, and the heating temperature of the resistance wire is adjusted. Ignition is performed by using a large amount of heat generated by energizing the resistance wire.
The resistive wire electricity may be a helical resistive wire secured to the first end of the electric igniter 12. The second end of the electrothermal igniter 12 extends out of the experimental atmosphere chamber 3 and is connected with the ignition control box 11.
Ignition by the resistance wire can be applied to measurement of a fire spread characteristic parameter of a liquid fuel having a higher ignition temperature.
The data acquisition and control system comprises a temperature measurement system (not shown in the figure), a flame radiation measurement device, an oxygen concentration measurement device, a camera device and a control system.
The flame radiation measuring device comprises, but is not limited to, a radiation heat flow sensor 15, wherein the radiation heat flow sensor 15 is arranged on the wall surface of the experimental atmosphere cabin 3, namely, on the inner side of the transparent fireproof glass plate 33. The radiant heat flux sensor 15 should be higher than the level of the top of the oil pool 14 and face the oil pool 14, and the radiant heat flux sensor 15 can detect the radiant quantity of the flame during the spreading process.
The oxygen concentration measuring means includes, but is not limited to, an oxygen concentration sensor 16, and the oxygen concentration sensor 16 is mounted on the wall surface of the experimental atmosphere chamber 3, that is, on the inside of the transparent fireproof glass plate 33. The oxygen concentration sensor 16 should be installed at the same level as the top of the oil pool 14 to monitor the oxygen concentration above the liquid surface of the oil pool 14. I.e. the mounting height of the radiant heat flow sensor 15 is higher than the mounting height of the oxygen concentration sensor 16.
The camera device comprises a high-speed camera 4 positioned outside the experimental atmosphere cabin 3, and the high-speed camera 4 is connected with the control system through a data line. The high-speed camera 4 can shoot the whole process of flame ignition and spread in the oil pool 14 and record the flame shape, and has two video storage modes of a memory card and computer storage. The high-speed camera 4 is located at one side of the oil pool 14, and the photographing direction is perpendicular to the length direction, thereby facilitating photographing of the flame spreading process along the length direction of the oil pool 14.
As shown in connection with fig. 3, the temperature measuring device 13 includes a flame temperature measuring device and a liquid fuel surface temperature measuring device.
Wherein the flame temperature measuring device comprises a first horizontal bracket (not shown in the figure) and a first armoured K-type thermocouple 131; the number of the first sheathed K-type thermocouples 131 is 5, and in fig. 3, 6# to 10# are all the first sheathed K-type thermocouples 131. Adjacent first armoured type K thermocouples 131 were spaced 8cm apart and all fixed on first horizontal brackets mounted on the wall surface of the experimental atmosphere chamber 3, i.e. inside the transparent fire-proof glass plate 33, and located directly above the oil pool 14.
The liquid fuel surface temperature measuring device comprises a second horizontal bracket (not shown in the figure) and a second armoured type K thermocouple 132; the number of second sheathed K-type thermocouples 132 is 5, and in fig. 3, 1# to 5# are all second sheathed K-type thermocouples 132. The adjacent second armoured type K thermocouples 132 are spaced 8cm apart and are all fixed on a second horizontal bracket, the second horizontal bracket is installed on the wall surface of the experimental atmosphere cabin 3, namely, on the inner side of the transparent fireproof glass plate 33, and the second horizontal bracket is equal to the fuel liquid level of the oil pool 14, namely, the installation height of the first armoured type K thermocouples 131 is higher than the installation height of the second armoured type K thermocouples 132, for example, the height difference between the first armoured type K thermocouples 131 and the second armoured type K thermocouples 132 is 15mm.
The distance between the first sheathed K-type thermocouples 131 and the distance between the second sheathed K-type thermocouples 132 may be set according to the length of the oil pool 14, and preferably, the first sheathed K-type thermocouples 131 and the second sheathed K-type thermocouples 132 may be uniformly arranged along the length direction of the oil pool 14.
According to the utility model, the first armoured K-type thermocouple 131 and the second armoured K-type thermocouple 132 are uniformly arranged along the length direction of the oil pool 14, so that the temperature change can be continuously detected in the flame spreading process, and meanwhile, the temperature change of liquid fuel can be continuously detected.
In some embodiments, the first horizontal support and the second horizontal support may each be a mounting bar secured to the transparent fire resistant glazing panel 33.
It should be noted that, the flame temperature measuring device in the present utility model includes, but is not limited to, the first armoured K-type thermocouple 131; the liquid fuel surface temperature measurement device includes, but is not limited to, a second armored K-type thermocouple 132.
The control system can be a computer 9, and the computer 9 is connected with a control switch of the high-pressure oxygen bottle 5 and a control switch of the high-pressure nitrogen bottle 6, a flow meter 7, a switching valve 8, a heating controller 10, an ignition control box 11 and an electrothermal igniter 12, a radiation heat flow sensor 15, an oxygen concentration sensor 16, a high-speed camera 4 and a temperature measuring device 13.
The computer 9 of the present utility model is capable of reading, displaying and storing the detected data of the radiant heat flow sensor 15, the oxygen concentration sensor 16 and the temperature measuring device 13 connected thereto.
When the liquid fuel fire spread characteristic measurement platform is used, the experiment preparation stage is as follows: the fuel is poured into the oil pool 14 in the experimental atmosphere cabin 3, the personnel leave and close the doors of the experimental compartment 2, and all the data acquisition and control systems are started.
When the experiment starts, firstly, the high-pressure oxygen bottle 5 is opened, after the flow meter 7 inputs the required oxygen flow, the oxygen concentration analyzer 16 detects that the oxygen concentration in the experiment atmosphere cabin 3 reaches the concentration required by the experiment, the heating controller 10 is opened to input the temperature required by the experiment, after the surface temperature of the liquid fuel in the oil tank 14 reaches the set temperature, the ignition control box 11 is opened to ignite the flame at the left end of the oil tank, the flame rapidly spreads to the right end, the temperature measuring device 13 records the temperature of the measuring point in real time, the high-speed camera 4 records the spreading process of the flame in real time, and the radiant heat flow meter 15 records the radiation amount of the flame in the spreading process in real time.
After the detection is finished, the gas conversion valve 8 is turned to be communicated with the high-pressure nitrogen cylinder 6, a large amount of nitrogen is introduced into the experimental atmosphere cabin 3 to extinguish flame, the test is finished, the smoke exhaust fan 1 is started, and waste gas in the experimental compartment 2 is exhausted.
As used in the specification and in the claims, the terms "a," "an," "the," and/or "the" are not specific to a singular, but may include a plurality, unless the context clearly dictates otherwise. In general, the terms "comprises" and "comprising" merely indicate that the steps and elements are explicitly identified, and they do not constitute an exclusive list, as other steps or elements may be included in a method or apparatus. The inclusion of an element defined by the phrase "comprising one … …" does not exclude the presence of additional identical elements in a process, method, article, or apparatus that comprises an element.
In the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different point from other embodiments, and identical and similar parts between the embodiments are all enough to refer to each other.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present utility model. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the utility model. Thus, the present utility model is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A liquid fuel fire spread property measurement platform, comprising:
the experimental atmosphere cabin is internally provided with an oil pool, and liquid fuel is contained in the oil pool;
a gas supply device which is communicated with the oil pool and supplies oxygen to the oil pool, and the oxygen concentration of the gas supply device is adjustable;
an ignition device capable of igniting the liquid fuel in the oil pool;
and the data acquisition and control system is used for detecting and recording flame radiation quantity, flame temperature and surface temperature of the liquid fuel in the liquid fuel propagation in the oil pool.
2. The liquid fuel fire spread property measurement platform of claim 1, wherein the experimental atmosphere cabin comprises:
the bracket is arranged on the upper surface of the bracket,
the oil tank is arranged in the sealed box body, and the sealed box body is provided with an exhaust port communicated with the outside; the ignition device stretches into the sealed box body and is suspended above the oil pool;
the oil tank is a transparent glass oil tank.
3. The liquid fuel fire spread property measuring platform of claim 2, wherein the sealed box comprises:
the base is fixed on the bracket, and the oil pool is arranged on the base;
the transparent fireproof glass plate is arranged on the support and is in sealing connection with the base to form a box body structure with an opening at the top.
4. The liquid fuel fire spread property measurement platform of claim 1, wherein the gas supply device comprises:
a high pressure oxygen supply device which is communicated with the oil pool through a first pipeline;
and the flowmeter is arranged on the first pipeline, and the oxygen amount flowing through the flowmeter can be adjusted through the flowmeter.
5. The liquid fuel fire spread property measurement platform of claim 4, wherein the gas supply device further comprises:
the high-pressure nitrogen supply device is communicated with the oil pool through a second pipeline;
a gas switching valve in communication with both the first conduit and the second conduit; the gas switching valve is communicated with the first pipeline in a first state; and in a second state, is communicated with the second pipeline.
6. The liquid fuel fire spread property measurement platform of claim 1, wherein the ignition device comprises:
a resistance wire suspended above the oil pool;
the electric heating igniter is electrically connected with the resistance wire and supplies current to the resistance wire;
the ignition control box is electrically connected with the electric heating igniter, and the ignition control box can adjust the current flowing through the electric heating igniter.
7. The liquid fuel fire spread property measurement platform of claim 1, further comprising:
and the heating device is used for heating the liquid fuel in the oil pool.
8. The liquid fuel fire spread property measurement platform of claim 7, wherein the heating device comprises:
the heating plate is attached to the outer wall of the oil pool;
and the heating controller is connected with the heating plate and used for adjusting the heating temperature of the heating plate.
9. A liquid fuel fire spread property measurement platform according to any one of claims 1 to 8, wherein the data acquisition and control system comprises:
a temperature measurement system that detects a temperature of the flame and a surface temperature of the liquid fuel of the oil pool;
a radiant heat flow sensor that detects an amount of radiation during flame propagation;
the camera device shoots the ignition, spreading process and flame shape of the flame;
and the computer is connected with the temperature measuring system, the radiation heat flow sensor and the camera device.
10. The liquid fuel fire spread property measurement platform of claim 9, wherein the temperature measurement system comprises:
the first armored K-type thermocouple is used for detecting the flame temperature and is fixed on the wall surface of the experimental atmosphere cabin through a first horizontal bracket;
the second armoured type K thermocouple detects the surface temperature of the liquid fuel, the second armoured type K thermocouple is fixed on the wall surface of the experimental atmosphere cabin through a second horizontal bracket, and the installation height of the first armoured type K thermocouple is higher than that of the second armoured type K thermocouple.
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