CN116413144A - Natural gas ignition method and system in full-size gas explosion test - Google Patents
Natural gas ignition method and system in full-size gas explosion test Download PDFInfo
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- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 title claims abstract description 330
- 239000003345 natural gas Substances 0.000 title claims abstract description 163
- 238000012360 testing method Methods 0.000 title claims abstract description 142
- 238000004880 explosion Methods 0.000 title claims abstract description 118
- 238000000034 method Methods 0.000 title claims abstract description 35
- 239000007789 gas Substances 0.000 title claims abstract description 32
- 238000005422 blasting Methods 0.000 claims abstract description 29
- 230000003068 static effect Effects 0.000 claims abstract description 25
- 238000010304 firing Methods 0.000 abstract description 10
- 238000003912 environmental pollution Methods 0.000 abstract description 5
- 230000000977 initiatory effect Effects 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/30—Investigating strength properties of solid materials by application of mechanical stress by applying a single impulsive force, e.g. by falling weight
- G01N3/313—Investigating strength properties of solid materials by application of mechanical stress by applying a single impulsive force, e.g. by falling weight generated by explosives
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
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Abstract
The invention provides a natural gas ignition method and a system in a full-size gas explosion test, wherein the ignition method comprises the following steps: determining the positions and angles of a plurality of pilot bomb launching devices relative to the explosion test pipeline according to the natural gas explosion static model and the natural gas quality in the explosion test pipeline; determining the time for a plurality of igniting bullet transmitting devices to transmit igniting bullets and the specification of the igniting bullets; and the plurality of igniting bullet emitting devices emit igniting bullets with corresponding specifications according to the determined time for emitting the igniting bullets, and ignite the natural gas escaping from the blasting test pipeline, wherein the plurality of igniting bullet emitting devices are arranged near the blasting test pipeline according to the determined position and angle. According to the invention, the height and the diameter of the natural gas and air mixed vapor cloud are quantitatively calculated, so that the height, the angle and the time of the firing of the igniting bullet are determined, the whole igniting process is safe and controllable, and the natural gas environmental pollution and uncontrollable explosion risk in the test process can be remarkably reduced.
Description
Technical Field
The invention belongs to the technical field of full-size gas explosion tests of natural gas conveying pipelines, and particularly relates to a natural gas ignition method and system in the full-size gas explosion test.
Background
After the natural gas pipeline leaks, a large amount of gas is dispersed from the leakage point due to high pressure in the pipeline, so that crack expansion of the leakage point and pipeline fracture can be caused, and accidents are caused. The full-size gas explosion test of the natural gas pipeline is used for simulating an actual service pipeline and is used for researching fracture toughness indexes and explosion hazard ranges of the steel pipe. In the test process, the pipeline is broken under the action of the internal pressure of the pipe after the crack is introduced, natural gas expands actively and rapidly, and severe physical explosion can be formed to generate strong shock waves and earthquake waves. Natural gas then rises rapidly into the air, mixes with the air, and accumulates into a combustible mixed vapor cloud.
The main component of natural gas is methane, which belongs to inflammable gas, and has a great risk if the natural gas is directly emptied. It is generally used to ignite and convert it into water and carbon dioxide to reduce atmospheric pollution. In addition, as a great amount of mixed vapor cloud of combustible gas is gathered, ignition phenomenon is easy to occur, uncontrollable vapor cloud explosion is caused, severe chemical explosion is formed, and great risk is brought.
When natural gas just leaks from a pipeline crack, the natural gas cannot be ignited because the methane solubility is high and the oxygen concentration is low and the ignition mixed concentration of the natural gas is not reached. When the natural gas mass rises to a certain height, the natural gas mass can be mixed with air to a certain extent, so that the ignition solubility (the steam cloud edge is fully and uniformly mixed with the air and is easy to ignite) is achieved. At this time, the ignition and the combustion are sufficient, and the environmental pollution and the risk are small.
Disclosure of Invention
Aiming at the problems, the invention provides a natural gas ignition method and a system in a full-size gas explosion test, which are suitable for the middle natural gas ignition treatment of the full-size gas explosion test of a natural gas pipeline.
The invention provides a natural gas ignition method in a full-size gas explosion test, which comprises the following steps:
determining the positions and angles of a plurality of pilot bomb launching devices relative to the explosion test pipeline according to the natural gas explosion static model and the natural gas quality in the explosion test pipeline;
determining the time for a plurality of igniting bullet transmitting devices to transmit igniting bullets and the specification of the igniting bullets;
and the plurality of igniting bullet emitting devices emit igniting bullets with corresponding specifications according to the determined time for emitting the igniting bullets, and ignite the natural gas escaping from the blasting test pipeline, wherein the plurality of igniting bullet emitting devices are arranged near the blasting test pipeline according to the determined position and angle.
Further, determining the position and angle of the plurality of pilot bomb launchers relative to the burst test pipeline based on the natural gas explosion static model and the natural gas mass within the burst test pipeline comprises the steps of:
when the natural gas reaches the ignition concentration, determining the diameter of the mixed vapor cloud according to the natural gas explosion static model and the natural gas quality in the explosion test pipeline;
determining the height of the mixed vapor cloud according to the natural gas explosion static model and the natural gas quality in the explosion test pipeline;
and determining the point positions and angles of the plurality of pilot bomb launching devices relative to the explosion test pipeline according to the height and the diameter of the mixed vapor cloud.
Further, determining the point location and angle of the plurality of pilot bomb launchers relative to the burst test pipeline according to the height and diameter of the mixed vapor cloud comprises:
constructing a pilot bomb launching device positioning model according to the height and the diameter of the mixed vapor cloud;
the point location of the pilot bullet emitting device relative to the burst test tube and the angles of the plurality of pilot bullet emitting devices are determined in the pilot bullet emitting device positioning model.
Further, determining the time at which the plurality of pilot cartridge emitting devices emit pilot cartridges and the specifications of the pilot cartridges includes the steps of:
calculating the time required for the natural gas escaping from the explosion test pipeline to rise to the height of the mixed vapor cloud;
and determining the time for the igniting bullet transmitting devices to transmit the igniting bullet at different set points according to the initial speed of the igniting bullet and the flying distance of the igniting bullet transmitted by different igniting bullet transmitting devices.
Further, the natural gas ignition method further comprises the steps of: the natural gas quality in the burst test pipeline is obtained by calculation according to the specification parameters of the burst test pipeline, and is specifically as follows:
according to the specification parameters of the explosion test pipeline, calculating to obtain the volume of natural gas in the explosion test pipeline;
and calculating the natural gas mass in the burst test pipeline according to the natural gas density and the natural gas volume in the burst test pipeline.
Further, the natural gas explosion static model is:
D＝5.8*m 1/3 (1)；
H＝4.35*m 1/3 (2)；
wherein D is the diameter of the vapor cloud, H is the distance between the sphere center of the vapor cloud and the ground when the ignition concentration is reached, and m is the mass of natural gas.
Further, constructing a positioning model of the igniting bullet transmitting device according to the height and the diameter of the mixed vapor cloud specifically comprises the following steps:
the mixed vapor cloud is defined as a circle with the diameter D, the center point of the circle is O, the height of the mixed vapor cloud is defined as a straight line OA passing through the center point O, the point A is the point of a blasting test pipeline, a straight line AB perpendicular to the straight line OA is formed from the point A, a straight line OE parallel to the straight line AB is formed from the point O, and the straight line OE intersects with the circle and is at the point C.
Further, the determining of the point position of the pilot bullet transmitting device relative to the blasting test pipeline and the angles of the plurality of pilot bullet transmitting devices in the pilot bullet transmitting device positioning model specifically comprises the following steps:
making a straight line CA1 perpendicular to a straight line AB from a point C, wherein A1 is an intersection point of the straight line AB and the straight line CA1, A1 is a first set point of the pilot bomb launching device, and the set points of other pilot bomb launching devices are sequentially determined at a certain interval in the direction of the straight line A1B by referring to the first set point A1;
the included angle formed by the connecting line from the set point of the plurality of igniting bullet transmitting devices to the point C in the straight line AB is the angle of the plurality of igniting bullet transmitting devices, and the length of the connecting line from the set point of the igniting bullet transmitting devices to the point C is the flying distance of the igniting bullet.
The invention also provides a natural gas ignition system in a full-size gas explosion test, which comprises:
the first calculation module is used for determining the positions and angles of the plurality of igniting bullet emitting devices relative to the blasting test pipeline according to the natural gas blasting static model and the natural gas quality;
the second calculation module is used for determining the time for the plurality of igniting bullet transmitting devices to transmit the igniting bullet and the specification of the igniting bullet;
and the plurality of igniting bullet transmitting devices are used for transmitting igniting the natural gas escaping from the blasting test pipeline according to the determined time for transmitting the igniting bullets with corresponding specifications, and the plurality of igniting bullet transmitting devices are arranged near the blasting test pipeline according to the determined positions and angles.
Further, the first computing module is specifically configured to:
when the natural gas reaches the ignition concentration, determining the diameter of the mixed vapor cloud according to the natural gas explosion static model and the natural gas quality in the explosion test pipeline; determining the height of the mixed vapor cloud according to the natural gas explosion static model and the natural gas quality in the explosion test pipeline; and determining the point positions and angles of the plurality of pilot bomb launching devices relative to the explosion test pipeline according to the height and the diameter of the mixed vapor cloud.
Further, the second computing module is specifically configured to:
calculating the time required for the natural gas escaping from the explosion test pipeline to rise to the height of the mixed vapor cloud; and determining the time for the igniting bullet transmitting devices to transmit the igniting bullet at different set points according to the initial speed of the igniting bullet and the flying distance of the igniting bullet transmitted by different igniting bullet transmitting devices.
Further, the natural gas ignition system further comprises:
the third calculation module is used for calculating and obtaining the quality of the natural gas in the explosion test pipeline according to the specification parameters of the explosion test pipeline, and specifically comprises the following steps:
according to the specification parameters of the explosion test pipeline, calculating to obtain the volume of natural gas in the explosion test pipeline; and calculating the natural gas mass in the burst test pipeline according to the natural gas density and the natural gas volume in the burst test pipeline.
The invention has the beneficial effects that: according to the invention, the height and the diameter of the natural gas and air mixed vapor cloud are quantitatively calculated, so that the height, the angle and the time of the firing of the igniting bullet are determined, the whole igniting process is safe and controllable, and the natural gas environmental pollution and uncontrollable explosion risk in the test process can be remarkably reduced.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention may be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions of the prior art, the following description will briefly explain the drawings used in the embodiments or the description of the prior art, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 shows a schematic flow diagram of a natural gas ignition method in a full-scale gas explosion test according to an embodiment of the present invention;
FIG. 2 shows a schematic diagram of a pilot cartridge firing device positioning model according to an embodiment of the present invention;
fig. 3 shows a schematic diagram of the natural gas ignition system in a full-size gas explosion test according to an embodiment of the present invention.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be noted that the terms "first," "second," and "third" are used 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.
The invention provides a natural gas ignition method in a full-size gas explosion test, which aims to reduce natural gas environmental pollution and uncontrollable explosion risks in the full-size gas explosion test process of a natural gas pipeline.
Referring to fig. 1, fig. 1 is a schematic flow chart of a natural gas ignition method in a full-size gas explosion test according to an embodiment of the invention.
The natural gas ignition method in the full-size gas explosion test comprises the following steps: determining the positions and angles of a plurality of pilot bomb launching devices relative to the explosion test pipeline according to the natural gas explosion static model and the natural gas quality in the explosion test pipeline; determining the time for a plurality of igniting bullet transmitting devices to transmit igniting bullets and the specification of the igniting bullets; and the plurality of igniting bullet emitting devices emit igniting bullets with corresponding specifications according to the determined time for emitting the igniting bullets, and ignite the natural gas escaping from the blasting test pipeline, wherein the plurality of igniting bullet emitting devices are arranged near the blasting test pipeline according to the determined position and angle.
According to the embodiment of the invention, the arrangement point position and angle of the igniting bullet transmitting device and the time for transmitting the igniting bullet can be determined, so that the whole igniting process is safe and controllable, the natural gas environment pollution and uncontrollable explosion risk in the test process can be obviously reduced, and the igniting bullet transmitting device has a good application value.
Further, the natural gas ignition method further comprises the following steps:
and calculating according to the specification parameters of the explosion test pipeline to obtain the quality of the natural gas in the explosion test pipeline.
Specifically, the method for obtaining the natural gas quality in the burst test pipeline comprises the following steps of:
and S11, calculating according to the specification parameters of the explosion test pipeline to obtain the volume of the natural gas in the explosion test pipeline.
The specification parameters of the burst test pipeline include the inner diameter of the pipeline, the pressure of natural gas in the pipeline and the length of the pipeline.
And S12, calculating the mass of the natural gas in the burst test pipeline according to the natural gas density and the natural gas volume in the burst test pipeline.
In specific implementation, the test pipeline is an X80 steel pipe with the outer diameter of 1422mm and the wall thickness of 18.4mm, the natural gas pressure in the pipeline is 12MPa, the length of the explosion cracking section of the pipeline is 40 m, and the temperature is 20 ℃. The natural gas volume in the pipeline was calculated to be 60.32 cubic meters, and then the mass of the natural gas in the pipeline was calculated to be 50668.8kg.
Specifically, the natural gas explosion static model is as follows:
D＝5.8*m 1/3 (1)；
H＝4.35*m 1/3 (2)；
wherein D is the diameter of the vapor cloud, H is the distance between the sphere center of the vapor cloud and the ground when the ignition concentration is reached, and m is the mass of natural gas.
Specifically, according to the natural gas explosion static model and the natural gas quality in the explosion test pipeline, determining the positions and angles of the plurality of pilot bomb launching devices relative to the explosion test pipeline comprises the following steps:
and S21, when the natural gas reaches the ignition concentration, determining the diameter of the mixed vapor cloud according to the formula (1) in the natural gas explosion static model and the quality of the natural gas in the explosion test pipeline.
S22, determining the height of the mixed vapor cloud according to the formula (2) in the natural gas explosion static model and the natural gas quality in the explosion test pipeline.
S23, determining the point positions and angles of the plurality of pilot bomb launching devices relative to the blasting test pipeline according to the height and the diameter of the mixed vapor cloud.
In the concrete implementation, according to the 50668.8kg of the quality of the natural gas in the pipeline, the diameter of the mixed vapor cloud is 214.6m and the height is 161m through calculation according to the formula (1) and the formula (2).
Specifically, determining the point positions and angles of the plurality of pilot bomb launchers relative to the blasting test pipeline according to the height and the diameter of the mixed vapor cloud comprises:
s31, constructing a pilot bomb launcher positioning model according to the height and the diameter of the mixed vapor cloud, referring to FIG. 2, FIG. 2 shows a schematic diagram of the pilot bomb launcher positioning model according to an embodiment of the present invention.
The method comprises the steps of defining a mixed vapor cloud as a circle with the diameter of D, defining the center point of the circle as O, defining the height of the mixed vapor cloud as a straight line OA passing through the center point O, defining the point A as the point of a blasting test pipeline, making a straight line AB perpendicular to the straight line OA from the point A, making a straight line OE parallel to the straight line AB from the point O, and intersecting the straight line OE with the circle and the point C.
S32, determining the point position of the igniting bullet transmitting device relative to the blasting test pipeline in the igniting bullet transmitting device positioning model, wherein a straight line CA1 perpendicular to the straight line AB is made from the point C, A1 is the intersection point of the straight line AB and the straight line CA1, A1 is the first setting point of the igniting bullet transmitting device, and the setting points of other igniting bullet transmitting devices are sequentially determined at a certain interval in the direction of the straight line A1B by referring to the first setting point A1.
Specifically, the first set point A1 is spaced from the burst test tube point a by a1a=1/2*D.
S33, determining angles of a plurality of igniting bullet transmitting devices in the igniting bullet transmitting device positioning model, wherein an included angle formed by connecting lines from the set points of the plurality of igniting bullet transmitting devices to the point C and the straight line AB is the angle of the plurality of igniting bullet transmitting devices, and the length of the connecting lines from the set points of the igniting bullet transmitting devices to the point C is the flight distance of the igniting bullet.
When the setting points of other igniting bullet transmitting devices are determined, igniting bullet transmitting device points A2 and A3 are additionally arranged in the direction A1B according to the interval of 50m, and then the intervals of the igniting bullet transmitting device points A2 and A3 relative to the explosion test pipeline point A are respectively as follows:
A2A＝1/2*D+50，A3A＝1/2*D+100。
further confirm the angle and the flight distance of igniting the bullet of a plurality of igniting bullet emitter, igniting bullet emitter setpoint A1, A2, the contained angle that the line of A3 to C point formed in straight line AB is respectively:
∠a1＝90°,∠a2＝72.7°,∠a3＝58°。
at the same time, the flying distances of the pilot charges emitted by the pilot charge emitting device set points A1, A2 and A3 are respectively l1=161m, l2=168.58m and l3=189.5 m.
Specifically, determining the time for the plurality of primer emitters to emit the primer and the specification of the primer includes the steps of:
and S31, calculating the time required for the natural gas escaping from the explosion test pipeline to rise to the height of the mixed vapor cloud.
S32, determining the time for the igniting bullet emission devices with different set points to emit the igniting bullet according to the initial speed of the igniting bullet and the flying distance of the igniting bullet emitted by the different igniting bullet emission devices.
In practice, it takes about 0.5s to calculate the rising of the escaping natural gas to 161m. If a pilot charge with an initial velocity of 100m/s (without air resistance and dead weight) is selected, 1.6s is required when the pilot charge is launched from the A1 position to the vapor cloud edge C point, 1.7s is required when the pilot charge is launched from the A2 position to the vapor cloud edge C point, and 1.9s is required when the pilot charge is launched from the A3 position to the vapor cloud edge C point. In order to ensure accurate ignition, the firing time of the pilot charge in the A1 position should be at least 2.1s earlier than the initiation time, the firing time of the pilot charge in the a2 position should be 2.2s earlier than the initiation time, and the firing time of the pilot charge in the a3 position should be 2.4s earlier than the initiation time.
If a pilot charge with an initial velocity of 50m/s (without air resistance and dead weight) is selected, 3.2s is required when the pilot charge is launched from the A1 position to the vapor cloud edge point C, 3.4s is required when the pilot charge is launched from the A2 position to the vapor cloud edge point C, and 3.8s is required when the pilot charge is launched from the A3 position to the vapor cloud edge point C. In order to ensure accurate ignition, the firing time of the pilot charge in the A1 position should be at least 3.7s earlier than the initiation time, the firing time of the pilot charge in the a2 position should be at least 3.9s earlier than the initiation time, and the firing time of the pilot charge in the a3 position should be at least 4.3s earlier than the initiation time.
In specific implementation, a plurality of igniting bullet emitting devices are arranged near a blasting test pipeline according to positions and angles determined by an igniting bullet emitting device positioning model, a plurality of emitting device points are respectively arranged at the points of A1, A2 and A3, and the model (emitting speed) of the igniting bullet is selected and the emitting time is determined according to the calculation result in S32.
Referring to fig. 3, fig. 3 is a schematic diagram illustrating a natural gas ignition system in a full-size gas explosion test according to an embodiment of the present invention.
The embodiment of the invention also provides a natural gas ignition system in a full-size gas explosion test, which comprises the following components:
the first calculation module is used for determining the positions and angles of the plurality of igniting bullet emitting devices relative to the blasting test pipeline according to the natural gas blasting static model and the natural gas quality;
the second calculation module is used for determining the time for the plurality of igniting bullet transmitting devices to transmit the igniting bullet and the specification of the igniting bullet;
and the plurality of igniting bullet transmitting devices are used for transmitting igniting the natural gas escaping from the blasting test pipeline according to the determined time for transmitting the igniting bullets with corresponding specifications, and the plurality of igniting bullet transmitting devices are arranged near the blasting test pipeline according to the determined positions and angles.
Further, the first computing module is specifically configured to: when the natural gas reaches the ignition concentration, determining the diameter of the mixed vapor cloud according to the natural gas explosion static model and the natural gas quality in the explosion test pipeline; determining the height of the mixed vapor cloud according to the natural gas explosion static model and the natural gas quality in the explosion test pipeline; and determining the point positions and angles of the plurality of pilot bomb launching devices relative to the explosion test pipeline according to the height and the diameter of the mixed vapor cloud.
Further, the second computing module is specifically configured to: and constructing a pilot bullet transmitting device positioning model according to the height and the diameter of the mixed vapor cloud, and determining the point positions of the pilot bullet transmitting device relative to the blasting test pipeline and the angles of a plurality of pilot bullet transmitting devices in the pilot bullet transmitting device positioning model.
Further, the natural gas ignition system further comprises: and the third calculation module is used for calculating and obtaining the quality of the natural gas in the explosion test pipeline according to the specification parameters of the explosion test pipeline.
Further, the third computing module is specifically configured to: according to the specification parameters of the explosion test pipeline, calculating to obtain the volume of natural gas in the explosion test pipeline; and calculating the natural gas mass in the burst test pipeline according to the natural gas density and the natural gas volume in the burst test pipeline.
The natural gas ignition method and the system are suitable for the middle natural gas ignition treatment of the full-size gas explosion test of the natural gas pipeline, and quantitatively calculate the height and the diameter of the natural gas and air mixed vapor cloud, so that the height, the angle and the time of the firing of the igniting bomb are determined, the whole ignition process is safe and controllable, and the natural gas environmental pollution and uncontrollable explosion risk in the test process can be obviously reduced.
Although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (12)
1. The natural gas ignition method in the full-size gas explosion test is characterized by comprising the following steps of:
determining the positions and angles of a plurality of pilot bomb launching devices relative to the explosion test pipeline according to the natural gas explosion static model and the natural gas quality in the explosion test pipeline;
determining the time for a plurality of igniting bullet transmitting devices to transmit igniting bullets and the specification of the igniting bullets;
and the plurality of igniting bullet emitting devices emit igniting bullets with corresponding specifications according to the determined time for emitting the igniting bullets, and ignite the natural gas escaping from the blasting test pipeline, wherein the plurality of igniting bullet emitting devices are arranged near the blasting test pipeline according to the determined position and angle.
2. A method of igniting natural gas in a full-scale gas explosion test according to claim 1, wherein determining the position and angle of the plurality of pilot bomb launchers relative to the explosion test pipeline based on the natural gas explosion static model and the natural gas mass within the explosion test pipeline comprises the steps of:
when the natural gas reaches the ignition concentration, determining the diameter of the mixed vapor cloud according to the natural gas explosion static model and the natural gas quality in the explosion test pipeline;
determining the height of the mixed vapor cloud according to the natural gas explosion static model and the natural gas quality in the explosion test pipeline;
and determining the point positions and angles of the plurality of pilot bomb launching devices relative to the explosion test pipeline according to the height and the diameter of the mixed vapor cloud.
3. The method of natural gas ignition in full-size gas explosion testing according to claim 2, wherein determining the point and angle of the plurality of pilot bomb launchers relative to the explosion test pipeline based on the height and diameter of the mixed vapor cloud comprises:
constructing a pilot bomb launching device positioning model according to the height and the diameter of the mixed vapor cloud;
the point location of the pilot bullet emitting device relative to the burst test tube and the angles of the plurality of pilot bullet emitting devices are determined in the pilot bullet emitting device positioning model.
4. A method of igniting natural gas in a full-size gas explosion test according to claim 1, wherein determining the time at which a plurality of pilot bullet emitting devices emit pilot bullets and the specifications of the pilot bullets comprises the steps of:
calculating the time required for the natural gas escaping from the explosion test pipeline to rise to the height of the mixed vapor cloud;
and determining the time for the igniting bullet transmitting devices to transmit the igniting bullet at different set points according to the initial speed of the igniting bullet and the flying distance of the igniting bullet transmitted by different igniting bullet transmitting devices.
5. A method of natural gas ignition in a full-size gas explosion test according to any one of claims 1 to 4, wherein the method of natural gas ignition further comprises the steps of: the natural gas quality in the burst test pipeline is obtained by calculation according to the specification parameters of the burst test pipeline, and is specifically as follows:
according to the specification parameters of the explosion test pipeline, calculating to obtain the volume of natural gas in the explosion test pipeline;
and calculating the natural gas mass in the burst test pipeline according to the natural gas density and the natural gas volume in the burst test pipeline.
6. A method of natural gas ignition in full-scale gas explosion testing according to claim 1 or 2, wherein the static model of natural gas explosion is:
D＝5.8*m 1/3 ；
H＝4.35*m 1/3 ；
wherein D is the diameter of the vapor cloud, H is the distance between the sphere center of the vapor cloud and the ground when the ignition concentration is reached, and m is the mass of natural gas.
7. A method of igniting natural gas in a full-size gas explosion test according to claim 3, wherein constructing a primer-bullet emitter positioning model based on the height and diameter of the mixed vapor cloud is specifically:
the mixed vapor cloud is defined as a circle with the diameter D, the center point of the circle is O, the height of the mixed vapor cloud is defined as a straight line OA passing through the center point O, the point A is the point of a blasting test pipeline, a straight line AB perpendicular to the straight line OA is formed from the point A, a straight line OE parallel to the straight line AB is formed from the point O, and the straight line OE intersects with the circle and is at the point C.
8. The method of natural gas ignition in full-size gas explosion testing according to claim 7, wherein determining the point location of the pilot bullet emitting device relative to the explosion test pipeline and the angles of the plurality of pilot bullet emitting devices in the pilot bullet emitting device positioning model is specifically:
making a straight line CA1 perpendicular to a straight line AB from a point C, wherein A1 is an intersection point of the straight line AB and the straight line CA1, A1 is a first set point of the pilot bomb launching device, and the set points of other pilot bomb launching devices are sequentially determined at a certain interval in the direction of the straight line A1B by referring to the first set point A1;
the included angle formed by the connecting line from the set point of the plurality of igniting bullet transmitting devices to the point C in the straight line AB is the angle of the plurality of igniting bullet transmitting devices, and the length of the connecting line from the set point of the igniting bullet transmitting devices to the point C is the flying distance of the igniting bullet.
9. A natural gas ignition system in a full-size gas explosion test, comprising:
the first calculation module is used for determining the positions and angles of the plurality of igniting bullet emitting devices relative to the blasting test pipeline according to the natural gas blasting static model and the natural gas quality;
the second calculation module is used for determining the time for the plurality of igniting bullet transmitting devices to transmit the igniting bullet and the specification of the igniting bullet;
and the plurality of igniting bullet transmitting devices are used for transmitting igniting the natural gas escaping from the blasting test pipeline according to the determined time for transmitting the igniting bullets with corresponding specifications, and the plurality of igniting bullet transmitting devices are arranged near the blasting test pipeline according to the determined positions and angles.
10. The natural gas ignition system of claim 9, wherein the first calculation module is specifically configured to:
when the natural gas reaches the ignition concentration, determining the diameter of the mixed vapor cloud according to the natural gas explosion static model and the natural gas quality in the explosion test pipeline; determining the height of the mixed vapor cloud according to the natural gas explosion static model and the natural gas quality in the explosion test pipeline; and determining the point positions and angles of the plurality of pilot bomb launching devices relative to the explosion test pipeline according to the height and the diameter of the mixed vapor cloud.
11. The natural gas ignition system of claim 9, wherein the second calculation module is specifically configured to:
calculating the time required for the natural gas escaping from the explosion test pipeline to rise to the height of the mixed vapor cloud; and determining the time for the igniting bullet transmitting devices to transmit the igniting bullet at different set points according to the initial speed of the igniting bullet and the flying distance of the igniting bullet transmitted by different igniting bullet transmitting devices.
12. A natural gas ignition system in a full-size gas explosion test according to any one of claims 9 to 11, wherein the natural gas ignition system further comprises:
the third calculation module is used for calculating and obtaining the quality of the natural gas in the explosion test pipeline according to the specification parameters of the explosion test pipeline, and specifically comprises the following steps:
according to the specification parameters of the explosion test pipeline, calculating to obtain the volume of natural gas in the explosion test pipeline; and calculating the natural gas mass in the burst test pipeline according to the natural gas density and the natural gas volume in the burst test pipeline.
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