CN114235895A - Confined space methane hydrogenation explosion characteristic test platform and test method - Google Patents
Confined space methane hydrogenation explosion characteristic test platform and test method Download PDFInfo
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- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 title claims abstract description 337
- 238000004880 explosion Methods 0.000 title claims abstract description 221
- 238000012360 testing method Methods 0.000 title claims abstract description 47
- 238000005984 hydrogenation reaction Methods 0.000 title claims abstract description 30
- 238000010998 test method Methods 0.000 title abstract description 9
- 239000007789 gas Substances 0.000 claims abstract description 151
- 239000001257 hydrogen Substances 0.000 claims abstract description 139
- 229910052739 hydrogen Inorganic materials 0.000 claims abstract description 139
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 130
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims abstract description 122
- 238000001514 detection method Methods 0.000 claims abstract description 10
- 238000006243 chemical reaction Methods 0.000 claims abstract description 7
- 229910001220 stainless steel Inorganic materials 0.000 claims description 84
- 239000010935 stainless steel Substances 0.000 claims description 84
- -1 Hydrogen Chemical class 0.000 claims description 35
- 230000002000 scavenging effect Effects 0.000 claims description 30
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 24
- 238000000034 method Methods 0.000 claims description 23
- 238000002474 experimental method Methods 0.000 claims description 17
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 12
- 230000001276 controlling effect Effects 0.000 claims description 12
- 239000002360 explosive Substances 0.000 claims description 12
- 239000000446 fuel Substances 0.000 claims description 12
- 229910052757 nitrogen Inorganic materials 0.000 claims description 12
- 239000001301 oxygen Substances 0.000 claims description 12
- 229910052760 oxygen Inorganic materials 0.000 claims description 12
- 238000007789 sealing Methods 0.000 claims description 10
- 238000004364 calculation method Methods 0.000 claims description 9
- 238000004140 cleaning Methods 0.000 claims description 9
- 239000012495 reaction gas Substances 0.000 claims description 9
- 238000001816 cooling Methods 0.000 claims description 6
- XLYOFNOQVPJJNP-ZSJDYOACSA-N heavy water Substances [2H]O[2H] XLYOFNOQVPJJNP-ZSJDYOACSA-N 0.000 claims description 6
- 238000007689 inspection Methods 0.000 claims description 4
- 238000007599 discharging Methods 0.000 claims description 3
- 238000012423 maintenance Methods 0.000 claims description 3
- 239000000126 substance Substances 0.000 claims description 3
- 238000005086 pumping Methods 0.000 claims description 2
- 230000001105 regulatory effect Effects 0.000 claims description 2
- 238000009423 ventilation Methods 0.000 claims description 2
- 230000000630 rising effect Effects 0.000 abstract description 2
- 239000010410 layer Substances 0.000 description 30
- 239000007788 liquid Substances 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000005855 radiation Effects 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000003889 chemical engineering Methods 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 239000002737 fuel gas Substances 0.000 description 1
- 239000011229 interlayer Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 238000004451 qualitative analysis Methods 0.000 description 1
- 239000000376 reactant Substances 0.000 description 1
- 239000002341 toxic gas Substances 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
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- 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
- G01N25/54—Investigating or analyzing materials by the use of thermal means by investigating flash-point; by investigating explosibility by determining explosibility
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Abstract
The invention provides a limited space methane hydrogenation explosion characteristic test platform which comprises a gas explosion reaction unit, a gas supply unit, a vacuumizing unit, a constant-temperature water bath box, a gas detection unit, a data acquisition unit and a PLC (programmable logic controller). The invention also provides a test method of the limited space methane hydrogenation explosion characteristic test platform. The explosion characteristic test platform and the test method for methane hydrogenation in the limited space can quantitatively, accurately and effectively regulate and control the temperature change of the water bath in the spherical explosion tank, and can form different maximum explosion pressures and maximum explosion pressure rising curves under different premixing concentrations of methane and hydrogen in the explosion characteristic test of methane hydrogenation in the limited space to know the explosion characteristic of the mixed gas of methane and hydrogen under the condition of the limited space.
Description
Technical Field
The invention belongs to the technical field of explosion characteristic tests, and relates to a limited space methane hydrogenation explosion characteristic test platform and a limited space methane hydrogenation explosion characteristic test method.
Background
The combustible gas explosion prevention and control technology is widely applied to dangerous places such as mines, petroleum, chemical engineering, metallurgy, fuel gas and the like with flammable, explosive and toxic gases. The method is an analysis method for quantitatively and accurately calculating the temperature change of the interlayer of the spherical explosion tank body based on the constant-temperature adjustable technology of the explosion characteristic, and is particularly common in the temperature detection application before gas explosion in the limited space of the underground roadway of the coal mine. However, the traditional test instrument can only perform qualitative analysis when regulating the water bath temperature inside the explosion tank, and has human experience errors, so that the temperature change inside the spherical explosion tank is difficult to effectively regulate and control.
Disclosure of Invention
In order to solve the technical problems, the invention provides a limited space methane hydrogenation explosion characteristic test platform and a limited space methane hydrogenation explosion characteristic test method.
In order to achieve the purpose, the invention adopts the following technical scheme: the limited space methane hydrogenation explosion characteristic test platform comprises a gas explosion reaction unit, a gas supply unit, a vacuumizing unit, a constant-temperature water bath box, a gas detection unit, a data acquisition unit and a PLC (programmable logic controller);
the gas explosion reaction unit comprises a spherical explosion tank and an ignition device, wherein the spherical explosion tank is provided with a water inlet and a water outlet, the water inlet is connected with the outlet of the constant-temperature water bath tank through a pipeline, and the water outlet is connected with the inlet of the constant-temperature water bath tank through a pipeline;
the gas supply unit comprises a methane gas cylinder, a hydrogen gas cylinder, an air cylinder, a four-way scavenging valve, a three-way air compressor valve and an air compressor, wherein the methane gas cylinder is sequentially connected with a first port of a methane gas cylinder pressure reducing valve, a methane mass flow meter and the four-way scavenging valve through pipelines;
the vacuum pumping unit comprises a vacuum pump, a vacuum pump valve, a vacuum pressure sensor valve and an exhaust valve, the vacuum pump is connected with one end of the vacuum pump valve through a pipeline, the other end of the vacuum pump valve is respectively connected with the exhaust valve, the vacuum pressure sensor valve and the spherical explosion tank through pipelines, and the vacuum pressure sensor valve is connected with the vacuum pressure sensor through a pipeline;
the exhaust valve is connected with the gas detection unit through a pipeline;
the data acquisition unit comprises a computer and a plurality of explosion pressure sensors, and the plurality of explosion pressure sensors are arranged inside the spherical explosion tank and used for detecting explosion pressure signals inside the spherical explosion tank;
the PLC is respectively and electrically connected with a computer, a methane mass flowmeter, a hydrogen mass flowmeter, an air mass flowmeter, a methane cylinder pressure reducing valve, a hydrogen cylinder pressure reducing valve, an air cylinder pressure reducing valve, an ignition device, a vacuum pressure sensor valve, an exhaust valve, a vacuum pump, a three-way air compressor valve, an air compressor, a constant temperature water bath box, a four-way scavenging valve and a plurality of explosion pressure sensors;
further, gaseous detecting element includes gas storage bag and gas chromatograph, the one end of gas storage bag is connected with discharge valve through the pipeline, and the other end is connected with gas chromatograph.
Furthermore, the spherical explosion tank is a hollow sphere, the spherical shell is a double-layer stainless steel jacket which comprises an inner-layer stainless steel jacket and an outer-layer stainless steel jacket which are concentric, a cavity is formed between the inner-layer stainless steel jacket and the outer-layer stainless steel jacket, the water inlet is formed in the bottom of the outer-layer stainless steel jacket, the water outlet is formed in the top of the outer-layer stainless steel jacket, water in the constant-temperature water bath box enters the cavity between the inner-layer stainless steel jacket and the outer-layer stainless steel jacket through the water inlet, and then returns to the constant-temperature water bath box from the water outlet to heat the spherical explosion tank in a water bath mode.
Furthermore, a sealing cover which can be opened and closed is arranged on the spherical explosion tank, and the ignition device is arranged on the sealing cover.
The invention provides a test method of a limited space methane hydrogenation explosion characteristic test platform, which comprises the following steps:
step 1, opening a constant-temperature water bath tank, raising the temperature of water in the constant-temperature water bath tank to a target experiment water bath temperature of a spherical explosion tank, keeping the temperature constant, and introducing the water after the temperature is raised into the spherical explosion tank;
and 4, vacuumizing the spherical explosion tank again: the method comprises the steps that a methane cylinder pressure reducing valve, a methane mass flowmeter, a hydrogen cylinder pressure reducing valve, a hydrogen mass flowmeter, an air cylinder pressure reducing valve and an air mass flowmeter are controlled to be closed through a PLC (programmable logic controller), a four-way scavenging valve and an exhaust valve are controlled to be closed through the PLC, an air compressor valve is adjusted to be switched to a closed state, an experiment is carried out under a standard working condition of 101325Pa, a vacuum pump valve and a vacuum pressure sensor valve are controlled to be opened through the PLC, a vacuum pump is started to vacuumize a spherical explosion tank, negative pressure is pumped to 10Pa, the spherical explosion tank is stopped being vacuumized, and at the moment, the spherical explosion tank can be considered to be completely in a vacuum state;
step 5, filling explosive reaction gas into the spherical explosion tank: the vacuum pump valve is controlled to be closed through the PLC, the methane gas cylinder pressure reducing valve and the methane mass flowmeter are opened, the three-way air compressor valve is adjusted to be switched to enable the spherical explosion tank to be communicated with the four-way scavenging valve, and the flow q1 and the methane inlet time t of the methane mass flowmeter are setFirst of allAdjusting the four-way scavenging valve to switch to a methane passage, filling methane gas with required proportion, closing the methane gas cylinder pressure reducing valve and the methane mass flowmeter, opening the hydrogen cylinder pressure reducing valve and the hydrogen mass flowmeter, keeping the state of the three-way air compressor valve unchanged, and setting the flow q of the hydrogen mass flowmeter2And hydrogen gas intake time tHydrogenAdjusting the four-way scavenging valve to switch to a hydrogen passage, and filling hydrogen with required proportion;
the PLC is used for controlling the closing of the hydrogen cylinder pressure reducing valve and the hydrogen mass flow meter, the opening of the air cylinder pressure reducing valve and the air mass flow meter, the state of the three-way air compressor valve is kept unchanged, and the flow q of the air mass flow meter is set3Adjusting the four-way scavenging valve to switch to an air passage, and filling air as air for balancing air pressure; when the computer displays that the internal pressure of the spherical explosion tank is a standard atmospheric pressure, the PLC controller controls the closing of the pressure reducing valve of the air bottle and the air qualityThe flow meter adjusts the four-way scavenging valve to be switched to a closed non-air supply passage, adjusts the three-way air compressor valve to be switched to a closed state, keeps the opening state of the vacuum pressure sensor valve unchanged, and stands;
Further, step 8 is performed after step 7, where step 8 specifically is: after the cleaning is finished, opening the sealing cover of the spherical explosion tank, repeating the steps 1 to 7, and changing the flow q of the methane mass flowmeter1Methane inlet time tFirst of allFlow rate q of hydrogen mass flow meter2Hydrogen gas inlet time tHydrogenAnd repeating the experiment to obtain different groups of pressure curves and pressure rise ratio data.
Further, step 9 is performed after step 8, where step 9 specifically is:
and 9, after the experiment is finished, controlling the water in the spherical explosion tank to be discharged from a water outlet by the PLC, cooling the water in the constant-temperature water bath tank to room temperature, then introducing room-temperature water into the cavity of the double-layer hollow stainless steel jacket of the spherical explosion tank until the water fills the cavity between the inner-layer stainless steel jacket and the outer-layer stainless steel jacket, wherein the time required for cooling the spherical explosion tank to the room temperature is t', and cooling the temperature in the spherical explosion tank to the room temperature.
Further, the flow velocity v of the inflow water in the step 1 is set to 0.0001m3/s。
Further, the flow rate q of the methane mass flow meter of the step 51Flow rate q of hydrogen mass flow meter2The calculation process of (2) is as follows:
A. flow q of methane mass flowmeter1The calculation process of (2):
in methane fuel CH4In the stoichiometric relation, the air in the air bottle consists of 21% by volume of oxygen and 79% by volume of nitrogen, namely 3.76mol of nitrogen in the air containing 1mol of oxygen;
for methane fuel CH4Chemical relation formula
CH4+2(O2+376N2)＝＝CO2+2H2O+752N2
Ideal mole ratio of methane gas to air [ CH4：(O2+N2)]Ideal for＝1：2；
Then:
that is to say that the first and second electrodes,
in equations (15) and (16):
[CH4：(O2+N2)]ideal for-the desired molar ratio of methane gas to air;
[CH4：(O2+N2)]practice of-actual molar ratio of methane gas to air;
φ1-the volume fraction of methane gas in the spherical explosion tank,%;
setting the equivalence ratio of methane gas according to experimental requirements
The volume fraction phi of methane gas in the spherical explosion tank can be obtained by the formula (15) and the formula (16)1Then according to phi1The volume V of the methane gas can be obtained by the volume V of the spherical explosion tankFirst of allCalculated by equation (17):
Vfirst of all＝Vφ1 (17)
In formula (17):
Vfirst of allVolume of methane gas introduced, m3；
V-volume of spherical explosion can, m3；
φ1-methane gas in% by volume of the spherical explosive tank;
the purity of the methane gas cylinder is 99.99 percent, and the volume of the methane gas which needs to be introduced actually
Is composed of
Obtaining the volume of methane gas which is actually required to be introduced, and setting the methane gas inlet time V according to the requirementFirst of allThen the flow q of the methane mass flow meter can be obtained by equation (18)1；
In equation (18):
Vfirst of allVolume of methane gas introduced, m3；
q1Flow of methane Mass flowmeter, m3/s；
tFirst of all-methane inlet time, s;
B. flow q of hydrogen mass flowmeter2The calculation process of (2):
in the stoichiometric relationship for hydrogen fuel, the air in the air bottle consists of 21% oxygen by volume and 79% nitrogen by volume, i.e. 3.76mol nitrogen per 1mol of oxygen in air;
stoichiometric relation for hydrogen fuel
2H2+O2+3.76N2＝2H2O+3.76N2
Ideal molar ratio of hydrogen to air [ H2：(O2+N2)]Ideal for＝2：1；
Then:
that is to say that the first and second electrodes,
in equations (19) and (20):
[H2：(O2+N2)]ideal for-the desired molar ratio of hydrogen to air;
[H2：(O2+N2)]practice of-the actual molar ratio of hydrogen to air;
φ2hydrogen gas occupying the volume of the spherical explosion tankFraction,%;
setting the hydrogen gas equivalence ratio according to the experiment requirements
The volume fraction phi of hydrogen in the spherical explosion tank can be obtained from the equations (19) and (20)2Then according to phi2The volume V of the introduced hydrogen gas can be determined from the internal volume V of the spherical explosion tankHydrogenCalculated by the following formula
VHydrogen＝Vφ2 (21)
In the formula (21), the first and second groups,
VhydrogenVolume of hydrogen gas introduced, m3；
V-volume of spherical explosion can, m3；
φ2-the volume fraction of hydrogen in the spherical explosive tank,%;
the purity of the hydrogen cylinder is 99.99%, and the volume V 'of the hydrogen gas to be actually introduced'HydrogenIs composed of
V′Hydrogen＝VHydrogen÷99.99％(m3)
Obtaining the volume V 'actually fed with hydrogen gas'HydrogenSetting the hydrogen gas intake time t as requiredHydrogenThe flow rate q of the hydrogen mass flow meter can be calculated by the formula (22)2；
In equation (22):
V′hydrogenVolume of actual hydrogen gas introduced, m3；
VHydrogenVolume of hydrogen gas required to be introduced, m3；
q2Mass flow of hydrogenFlow rate of the meter, m3/s；
tHydrogenHydrogen admission time, s.
Further, the flow q of the air mass flowmeter in the step 53Set to flow rate q with a methane mass flowmeter1The same is true.
Compared with the prior art, the invention has the following beneficial effects:
the explosion characteristic test platform and the test method for methane hydrogenation in the limited space can quantitatively, accurately and effectively regulate and control the temperature change of the water bath in the spherical explosion tank, and can form different maximum explosion pressures and maximum explosion pressure rising curves under different premixing concentrations of methane and hydrogen in the explosion characteristic test of methane hydrogenation in the limited space to know the explosion characteristic of the mixed gas of methane and hydrogen under the condition of the limited space.
Drawings
FIG. 1 is a schematic structural diagram of a confined space methane hydrogenation explosion characteristic experiment platform according to the present invention;
FIG. 2 is a schematic diagram of the connection of the PLC controller of the present invention;
wherein, 1-spherical explosion tank, 101-inner layer stainless steel sleeve, 102-outer layer stainless steel sleeve, 103, cavity, 2-explosion pressure sensor, 3-water inlet, 4-ignition device, 5-water outlet, 6-vacuum pressure sensor, 7-three-way air compressor valve, 8-exhaust valve, 9-gas storage bag, 10-vacuum pump valve, 11-vacuum pump, 12-constant temperature water bath tank, 131-methane mass flowmeter, 132-hydrogen mass flowmeter, 133-air mass flowmeter, 141-methane gas cylinder pressure reducing valve, 142-hydrogen gas cylinder pressure reducing valve, 143-air cylinder pressure reducing valve, 15-air compressor, 151-methane gas cylinder, 152-hydrogen gas cylinder, 153-air cylinder, 16-four-way scavenging valve, 17-vacuum pressure sensor valve, 18-PLC controller, 19-computer, 20-sealing cover.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
Referring to fig. 1-2, the confined space methane hydrogenation explosion characteristic test platform comprises a gas explosion reaction unit, a gas supply unit, a vacuumizing unit, a constant temperature water bath, a gas detection unit, a data acquisition unit and a PLC (programmable logic controller);
the gas explosion reaction unit comprises a spherical explosion tank 1 and an ignition device 4, wherein the spherical explosion tank 1 is provided with a water inlet 3 and a water outlet 5, the water inlet 3 is connected with an outlet of a constant-temperature water bath tank 12 through a pipeline, and the water outlet 5 is connected with an inlet of the constant-temperature water bath tank 12 through a pipeline; the constant temperature water bath box 12 is electrified to heat and circulate water, so that the heat can be fully exchanged with the spherical explosion tank 1;
the gas supply unit comprises a methane gas cylinder 151, a hydrogen gas cylinder 152, an air cylinder 153, a four-way scavenging valve 16, a three-way air compressor valve 7 and an air compressor 15, wherein the methane gas cylinder 151 is sequentially connected with first ports of a methane gas cylinder pressure reducing valve 141, a methane mass flow meter 131 and the four-way scavenging valve 16 through pipelines, the hydrogen gas cylinder 152 is sequentially connected with second ports of the hydrogen gas cylinder pressure reducing valve 142, the hydrogen mass flow meter 132 and the four-way scavenging valve 16 through pipelines, the air cylinder 153 is sequentially connected with third ports of the air cylinder pressure reducing valve 143, the air mass flow meter 133 and the four-way scavenging valve 16 through pipelines, a fourth port of the four-way scavenging valve 16 is connected with one port of the three-way air compressor valve 7 through a pipeline, and the other two ports of the three-way air compressor valve 7 are respectively connected with the air compressor 15 and the spherical explosion tank 1 through pipelines;
the vacuumizing unit comprises a vacuum pump 11, a vacuum pump valve 10, a vacuum pressure sensor 6, a vacuum pressure sensor valve 17 and an exhaust valve 8, wherein the vacuum pump 11 is connected with one end of the vacuum pump valve 10 through a pipeline, the other end of the vacuum pump valve 10 is respectively connected with the exhaust valve 8, the vacuum pressure sensor valve 17 and the spherical explosion tank 1 through pipelines, and the vacuum pressure sensor valve 17 is additionally connected with the vacuum pressure sensor 6 through a pipeline;
the exhaust valve 8 is connected with a gas detection unit through a pipeline;
the data acquisition unit comprises a computer 19 and a plurality of explosion pressure sensors 2, wherein the plurality of explosion pressure sensors 2 are arranged inside the spherical explosion tank 1 and are used for detecting explosion pressure signals inside the spherical explosion tank 1;
the PLC 18 is respectively electrically connected with a computer 19, a methane mass flow meter 131, a hydrogen mass flow meter 132, an air mass flow meter 133, a methane cylinder reducing valve 141, a hydrogen cylinder reducing valve 142, an air cylinder reducing valve 143, an ignition device 4, a vacuum pressure sensor 6, a vacuum pressure sensor valve 17, an exhaust valve 8, a vacuum pump valve 10, a vacuum pump 11, a three-way air compressor valve 7, an air compressor 15, a constant temperature water bath 12, a four-way scavenging valve 16 and a plurality of explosion pressure sensors 2;
the gas detection unit comprises a gas storage bag 9 and a gas chromatograph (not shown in the figure), one end of the gas storage bag is connected with the exhaust valve 8 through a pipeline, the other end of the gas storage bag is connected with the gas chromatograph, and the gas chromatograph is used for detecting the volume fraction and the gas type of methane and hydrogen in the mixed gas and determining whether the mixed gas meets the test requirements or not.
The spherical explosion tank 1 is a hollow sphere, the shell of the sphere is a double-layer stainless steel jacket which comprises an inner-layer stainless steel sleeve 101 and an outer-layer stainless steel sleeve 102 which are concentric, a cavity is formed between the inner-layer stainless steel sleeve 101 and the outer-layer stainless steel sleeve 102, the water inlet 3 is arranged at the bottom of the outer-layer stainless steel sleeve 102, the water outlet 5 is arranged at the top of the outer-layer stainless steel sleeve 102, water in the constant-temperature water bath box 12 enters the cavity 103 between the inner-layer stainless steel sleeve 101 and the outer-layer stainless steel sleeve 102 through the water inlet 3, and then returns to the constant-temperature water bath box 12 from the water outlet 5 to heat the spherical explosion tank 1 in a water bath manner.
The spherical explosion tank 1 is provided with a sealing cover 20 which can be opened and closed, and the ignition device 4 is arranged on the sealing cover 20.
Example 2
The test method of the limited space methane hydrogenation explosion characteristic test platform comprises the following steps:
step 1, opening a constant temperature water bath tank 12, raising the temperature of water in the constant temperature water bath tank 12 to a target experiment water bath temperature of a spherical explosion tank 1, keeping the temperature constant, introducing the water after the temperature is raised into the spherical explosion tank, setting a water inlet flow velocity v and a water inlet time t by a PLC (programmable logic controller) 18, and ensuring that the temperature in the spherical explosion tank 1 is kept constant and is always at the water bath temperature required by an experiment when the spherical explosion tank 1 reaches the water bath temperature and the water inlet flow velocity v is kept constant after the water inlet time t is reached;
the flow velocity v of the feed water in step 1 was set to 0.0001m3/s；
The water inlet time t in the step 1 is calculated by the following steps:
step 1), calculating the radius r of the spherical explosion tank 1 according to the volume V of the spherical explosion tank 1;
the volume V of the spherical explosion can 1 is set to 0.025m3，
Calculating according to the formula (1) to obtain the radius r of the spherical explosion tank 1 to be 0.181 m;
step 2) inner layer stainless steel sleeve 101 wall thickness d of spherical explosion tank 1 of the inventionInner part0.005m, the outer radius r of the stainless steel sleeve 101 of the inner layer of the spherical explosion tank 1Inner partComprises the following steps:
rinner part＝r+dInner part＝(0.181+0.005)m＝0.186m；
The thickness d of the cavity 103 between the inner stainless steel sleeve 101 and the outer stainless steel sleeve 102 of the spherical explosion can 1 of the present inventionAir conditioner0.01m, the wall thickness d of the outer stainless steel sleeve 102 is 0.005m, and the inner radius r of the outer stainless steel sleeve 102Outer coverIs rOuter cover＝rInner part+dAir conditioner＝(0.186+0.01)m＝0.196m；
Calculating the external surface area S of the stainless steel sleeve 101 of the inner layer of the spherical explosion tank 1 according to the formula (2)Inner part；
In equation (2):
Sinner partOuter surface area, m, of stainless steel jacket 101 of inner layer of spherical explosion tank 12；
rInner part-the outer radius, m, of the inner stainless steel jacket 101;
step 3), calculating the mass m of the inner stainless steel sleeve 101 according to the formula (3)Inner part；
In equation (3):
minner part-mass of inner stainless steel jacket 101, kg;
rho-density of steel, kg/m3；ρ＝7850kg/m3；
VtVolume of stainless steel jacket 101 of inner layer of spherical explosion tank 1, m3；
Step 4), calculating the heat Q absorbed by the inner stainless steel sleeve 101 according to the formula (4)Absorbing heat；QAbsorbing heat＝CmInner partΔT＝0.46×16.609×(TBath-TChamber)＝0.046×16.609×(60-20)＝305.6KJ (4)
In equation (4):
Qabsorbing heat-the heat absorbed by the inner stainless steel jacket 101, kJ;
c-specific heat capacity of the steel, kJ/(kg. DEG C); c ═ 0.46kJ/(kg ℃);
delta T-temperature of Water bath TBathAnd room temperature TChamberTemperature difference of (d), (c); in this example, let room temperature TChamberAt a temperature of 20 ℃ and a bath temperature TBathAt 60 ℃, Δ T ═ 40 ℃;
minner part-mass of inner stainless steel jacket 101, kg;
step 5), heat is transferred from the high-temperature object to the low-temperature object, and the heat comprises heat conduction, heat convection and heat radiation, and because water is in direct contact with the double-layer stainless steel jacket of the spherical explosion tank 1, the heat radiation can be ignored in heat convection, and only the heat conduction needs to be considered;
the heat transferred to the outer surface of the inner stainless steel sleeve 101 per square meter per second is calculated according to the formula (5)
In equation (5):
Lambda-thermal conductivity of steel, W/(m)2·℃)；
dInner partInner stainless steel jacket 101 wall thickness of spherical explosion can 1, m;
delta T-temperature of Water bath TBathAnd room temperature TChamberTemperature difference of (d), (c);
lambda is 45W/(m)2·℃)，dInner part＝0.005m，ΔT＝40℃；
Then the process of the first step is carried out,
step 6), calculating the volume V of water filled in the cavity 103 between the inner stainless steel sleeve 101 and the outer stainless steel sleeve 102 according to the formulas (7), (8) and (9)Water (W)；
VWater (W)＝VOuter cover-VInner part＝3.14×10-2h2 (9)
In the formulas (7), (8) and (9),
Vwater (W)Volume of water filled cavity 103 between inner stainless steel jacket 101 and outer stainless steel jacket 102, m3；
VOuter coverVolume of sphere enclosed by inner surface of outer stainless steel jacket 102 and height of water in cavity 103, m3；
VInner partThe volume of the sphere enclosed by the outer surface of the inner stainless steel sleeve 101 and the height of the water in the cavity 103, m3；
h, the liquid level height m of water in a cavity 103 between the inner stainless steel sleeve 101 and the outer stainless steel sleeve 102 is introduced;
wherein, VOuter cover' -the volume of the sphere surrounded by the outer stainless steel jacket 102 by water when the cavity 103 is filled with water, m3；
VInner part' -volume of sphere with inner stainless steel jacket 101 surrounded by water when cavity 103 is filled with water, m3；
Step 7), calculating water inlet time t;
the flow velocity v of the inflow water is 0.0001m3The water inlet time t is calculated according to the formulas (9) and (10);
Vwater (W)＝vt＝3.14×10-2h2(m3) (10)
Then t is 314h2(s) (11)
In equations (10) and (11):
h, the liquid level height m of water in a cavity 103 between the inner stainless steel sleeve 101 and the outer stainless steel sleeve 102 is introduced;
t is water inlet time, s;
v-inflow velocity, m3/s；
VWater (W)Volume of water filled cavity 103 between inner stainless steel jacket 101 and outer stainless steel jacket 102, m3；
Calculating the liquid level h of water in a cavity 103 between the inner stainless steel sleeve 101 and the outer stainless steel sleeve 102;
according to SCurved surface＝2πrInner parth＝1.168h(m2) (12)
QAbsorbing heat＝Q1t＝42.048h×314h2＝13203h3＝305.6KJ (14)
Solving h to 0.285m, substituting into formula (11),
obtaining t as 25.5 s;
in equations (12), (13), and (14):
t is water inlet time, s;
Scurved surfacex surface area of Water-soaked inner stainless Steel Sleeve 101, m2；
h, the liquid level height m of water in a cavity 103 between the inner stainless steel sleeve 101 and the outer stainless steel sleeve 102 is introduced;
Q1-the heat transferred per unit time to the inner stainless steel jacket 101, kJ.
Step 2, checking the air tightness of the spherical explosion tank 1: the method comprises the steps that a gas channel between a three-way air compressor valve 7 and a spherical explosion tank 1 is controlled to be closed through a PLC (programmable logic controller) 18, an exhaust valve 8 is controlled to be closed through the PLC 18, a vacuum pump valve 10 and a vacuum pressure sensor valve 17 are controlled to be opened through the PLC 18, a vacuum pump 11 is controlled to be started through the PLC 18 to vacuumize the spherical explosion tank 1 to 20kPa, a computer 19 displays that the vacuumization is completed, the vacuum pump 11 is controlled to be closed through the PLC 18, the vacuumization is stopped, the time is 3 minutes, if the computer 19 displays that the spherical explosion tank 1 is decompressed, a test is stopped, manual inspection and maintenance are needed, and a step 2 is repeated to ensure that the air tightness of the spherical explosion tank 1 is good; the PLC 18 is used for controlling the opening of the three-way air compressor valve 7 and the air compressor 15, the spherical explosion tank 1 is communicated to be filled with air, after the pressure in the spherical explosion tank 1 reaches a standard atmospheric pressure, the computer 19 displays that the three-way air compressor valve 7 and the air compressor 15 are closed, and the air tightness inspection is completed;
and 4, vacuumizing the spherical explosion tank 1 again: the PLC 18 is used for controlling and closing the methane gas cylinder pressure reducing valve 141, the methane mass flow meter 131, the hydrogen gas cylinder pressure reducing valve 142, the hydrogen mass flow meter 132, the air cylinder pressure reducing valve 143 and the air mass flow meter 133, the PLC 18 is used for controlling and closing the four-way scavenging valve 16 and the exhaust valve 8, the three-way air compressor valve 7 is adjusted to be switched to a closed state, an experiment is carried out under the standard working condition of 101325Pa, the PLC 18 is used for controlling and opening the vacuum pump valve 10 and the vacuum pressure sensor valve 17, the vacuum pump 11 is started to vacuumize the spherical explosion tank 1, the negative pressure is pumped to 10Pa, the spherical explosion tank 1 is stopped being vacuumized, and at the moment, the spherical explosion tank 1 can be considered to be completely in a vacuum state;
step 5, filling explosive reaction gas into the spherical explosion tank 1: the vacuum pump valve 10 is controlled to be closed by the PLC 18, the methane gas cylinder pressure reducing valve 141 and the methane mass flowmeter 131 are opened, the three-way air compressor valve 7 is adjusted to be switched to enable the spherical explosion tank 1 to be communicated with the four-way scavenging valve 16, and methane inlet air is setFlow rate q1And methane intake time tFirst of allAdjusting the four-way scavenging valve 16 to switch to the methane passage, charging the required proportion of methane gas, closing the methane gas cylinder pressure reducing valve 141 and the methane mass flowmeter 131, opening the hydrogen cylinder pressure reducing valve 142 and the hydrogen mass flowmeter 132, keeping the state of the three-way air compressor valve 7 unchanged, and setting the flow q of the hydrogen mass flowmeter2And hydrogen gas intake time tHydrogenThe four-way scavenging valve 16 is adjusted to be switched to a hydrogen passage, and hydrogen with the required proportion is filled;
the PLC 18 controls the closing of the hydrogen cylinder pressure reducing valve 142 and the hydrogen mass flow meter 132, the opening of the air cylinder pressure reducing valve 143 and the air mass flow meter 133, and the setting of the proper air intake flow q with the three-way air compressor valve 7 kept in the same state3Adjusting the four-way scavenging valve 16 to switch to an air passage, and filling air as air for balancing air pressure; when the computer 19 displays that the internal pressure of the spherical explosion tank 1 is a standard atmospheric pressure, the PLC 18 controls the air bottle pressure reducing valve 143 and the air mass flow meter 133 to be closed, the four-way scavenging valve 16 is adjusted to be switched to close the non-air supply passage, the three-way air compressor valve 7 is adjusted to be switched to a closed state, and the vacuum pressure sensor valve 17 keeps an open state unchanged; standing for 5 minutes;
the methane inlet flow rate q of the step 51Methane inlet time tFirst of allFlow rate q of hydrogen mass flow meter2Hydrogen gas inlet time tHydrogenThe calculation process of (2) is as follows:
A. in methane fuel CH4In the stoichiometric relation, the air in the air bottle 153 is composed of 21% by volume of oxygen and 79% by volume of nitrogen, i.e. 3.76mol of nitrogen in 1mol of oxygen;
for methane fuel CH4Chemical relation formula
CH4+2(O2+3.76N2)＝CO2+2H2O+7.52N2
Molar ratio of the reactants [ CH4：(O2+N2)]Ideal for＝1∶2
Then:
that is to say that the first and second electrodes,
in equations (15) and (16):
[CH4：(O2+N2)]ideal for-the desired molar ratio of methane gas to air;
[CH4：(O2+N2)]practice of-actual molar ratio of methane gas to air;
φ1-the volume fraction of methane gas in the spherical explosive tank 1,%;
at an equivalence ratio of 1, the explosion is most severe. In the equivalent ratio of methane gas
For example, 1, the volume fraction φ of methane gas in the spherical explosion tank 1 can be obtained from the formula (15) and the formula (16)19.5%, then according to phi1The volume V of the methane gas introduced can be determined from the internal volume V of the spherical explosion tank 1First of allCalculated by equation (17):
Vfirst of all＝Vφ1＝0.025×9.5％(m3)＝2.375×10-3(m3) (17)
In formula (17):
Vfirst of allVolume of methane gas introduced, m3；
V-volume of spherical explosion can 1, m3；
φ1-methane gas in% by volume of the spherical explosive tank 1;
the volume V of the introduced methane gas is obtained by calculationFirst of allIs 2.375X 10-3m3And the purity of the methane gas cylinder 151 is 99.99 percent, the volume of the methane gas which needs to be introduced actually
Is composed of
Obtaining the volume of methane gas which needs to be actually introduced, wherein the methane gas inlet time t is set to 300s in the embodiment, and then the flow q1 of the methane mass flowmeter can be obtained through the formula (18);
in equation (18):
Vfirst of allVolume of methane gas introduced, m3；
q1Flow of methane Mass flowmeter, m3/s；
tFirst of all-methane intake time, s;
calculating the flow q of the methane mass flowmeter by the formula (17)1Is 7.92 multiplied by 10-6m3/s；
B. In the stoichiometric relationship for hydrogen fuel, the air in the air bottle 153 consists of 21% oxygen by volume and 79% nitrogen by volume, i.e., 3.76 moles of nitrogen per 1 mole of oxygen in the air;
stoichiometric relation for hydrogen fuel
2H2+O2+3.76N2＝2H2O+3.76N2
Ideal molar ratio of hydrogen to air [ H2：(O2+N2)]Ideal for＝2：1
Then:
that is to say that the first and second electrodes,
in equations (19) and (20):
[H2：(O2+N2)]ideal for-the desired molar ratio of hydrogen to air;
[H2：(O2+N2)]practice of-actual molar ratio of methane gas and air;
φ2-the volume fraction of hydrogen gas in the spherical explosive tank 1,%;
when the equivalence ratio is 1, hydrogen explosion is most violent; this example sets the hydrogen gas equivalence ratio
To 1, the volume fraction φ of hydrogen in the spherical explosion tank 1 can be determined from the equations (19) and (20)2Is 29.6%, then according to phi2The volume V of the introduced hydrogen gas can be determined from the volume V of the spherical explosion tank 1HydrogenCalculated by the following formula
VHydrogen＝Vφ2＝0.025×29.6％(m3)＝0.0074(m3) (21)
In the formula (21), the first and second groups,
VhydrogenVolume of hydrogen gas introduced, m3；
V-volume of spherical explosion can 1, m3；
φ2-the volume fraction of hydrogen in the spherical explosive tank,%;
introducing hydrogen gas volume V according to experiment requirementsHydrogenIs 7.4X 10-3m3When the purity of the hydrogen cylinder 152 is 99.99%, the volume V 'of the hydrogen gas to be actually introduced is required'HydrogenIs composed of
V′Hydrogen＝7.4×10-3÷99.99％＝7.4×10-3m3
Obtaining the volume V 'actually fed with hydrogen gas'HydrogenIs 7.4 × 10-3m3In the present embodiment, the hydrogen gas intake time t is setHydrogenIs 900s, the flow rate q of the hydrogen mass flow meter 132 can be calculated by the formula (20)2；
In equation (22):
V′hydrogenVolume of actual hydrogen gas introduced, m3；
VHydrogenVolume of hydrogen gas required to be introduced, m3；
q2Flow of Hydrogen Mass flowmeter, m3/s；
tHydrogen-hydrogen admission time, s;
introducing air into the spherical explosion tank 1 mainly as balance gas, and controlling the flow q of the air mass flow meter 1333Set to flow rate q with a methane mass flowmeter1Same as 7.92X 10-6m3And/s, when the computer 19 displays that the internal pressure of the spherical explosion tank 1 reaches a standard atmospheric pressure, stopping the ventilation of the air bottle 153, closing the air bottle pressure reducing valve 143 and the air mass flow meter 133, and standing for 5 minutes.
Step 9 is performed after step 8, where step 9 specifically is:
step 9, after the experiment is finished, the PLC 18 controls the water in the spherical explosion tank 1 to be discharged from the water outlet 5, the temperature of the water in the constant-temperature water bath tank 12 is reduced to room temperature, then room-temperature water is introduced into the cavity 103 of the double-layer hollow stainless steel jacket of the spherical explosion tank 1 until the water fills the cavity 103 between the inner stainless steel sleeve 101 and the outer stainless steel sleeve 102, the time required for the spherical explosion tank 1 to be reduced to the room temperature is t', and the temperature in the spherical explosion tank 1 is reduced to the room temperature;
the calculation process of the time t' required for the spherical explosion can 1 to be cooled to room temperature is as follows:
because room temperature water fills cavity 103 between inner stainless steel sleeve 101 and outer stainless steel sleeve 102, then
Then the process of the first step is carried out,
Qabsorbing heat＝Q2t′＝15.66t′＝305.6KJ (25)
The solution of the formula (25) yields t ═ 19.5s
In equations (23), (24), and (25):
t' -the time required for the spherical explosion tank 1 to cool to room temperature, s;
Qabsorbing heat-the heat absorbed by the inner stainless steel jacket 101, kJ;
Q2heat transferred to room temperature water by inner stainless steel sleeve 101 per unit time，kJ；
The principles and embodiments of the present invention have been described herein using specific examples, which are provided only to help understand the method and the core concept of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.
Claims (10)
1. The limited space methane hydrogenation explosion characteristic test platform is characterized by comprising a gas explosion reaction unit, a gas supply unit, a vacuumizing unit, a constant-temperature water bath box, a gas detection unit, a data acquisition unit and a PLC (programmable logic controller);
the gas explosion reaction unit comprises a spherical explosion tank and an ignition device, wherein the spherical explosion tank is provided with a water inlet and a water outlet, the water inlet is connected with the outlet of the constant-temperature water bath tank through a pipeline, and the water outlet is connected with the inlet of the constant-temperature water bath tank through a pipeline;
the gas supply unit comprises a methane gas cylinder, a hydrogen gas cylinder, an air cylinder, a four-way scavenging valve, a three-way air compressor valve and an air compressor, wherein the methane gas cylinder is sequentially connected with a first port of a methane gas cylinder pressure reducing valve, a methane mass flow meter and the four-way scavenging valve through pipelines;
the vacuum pumping unit comprises a vacuum pump, a vacuum pump valve, a vacuum pressure sensor valve and an exhaust valve, the vacuum pump is connected with one end of the vacuum pump valve through a pipeline, the other end of the vacuum pump valve is respectively connected with the exhaust valve, the vacuum pressure sensor valve and the spherical explosion tank through pipelines, and the vacuum pressure sensor valve is connected with the vacuum pressure sensor through a pipeline;
the exhaust valve is connected with the gas detection unit through a pipeline;
the data acquisition unit comprises a computer and a plurality of explosion pressure sensors, and the plurality of explosion pressure sensors are arranged inside the spherical explosion tank and used for detecting explosion pressure signals inside the spherical explosion tank;
the PLC is respectively and electrically connected with a computer, a methane mass flowmeter, a hydrogen mass flowmeter, an air mass flowmeter, a methane cylinder pressure reducing valve, a hydrogen cylinder pressure reducing valve, an air cylinder pressure reducing valve, an ignition device, a vacuum pressure sensor valve, an exhaust valve, a vacuum pump, a three-way air compressor valve, an air compressor, a constant temperature water bath box, a four-way scavenging valve and a plurality of explosion pressure sensors.
2. The confined space methane hydrogenation explosion characteristic test platform of claim 1, wherein the gas detection unit comprises a gas storage bag and a gas chromatograph, one end of the gas storage bag is connected with the exhaust valve through a pipeline, and the other end of the gas storage bag is connected with the gas chromatograph.
3. The confined space methane hydrogenation explosion characteristic test platform as claimed in claim 1, wherein the spherical explosion tank is a hollow sphere, the outer shell of the sphere is a double-layer stainless steel jacket, the double-layer stainless steel jacket comprises an inner-layer stainless steel sleeve and an outer-layer stainless steel sleeve which are concentric, a cavity is formed between the inner-layer stainless steel sleeve and the outer-layer stainless steel sleeve, the water inlet is arranged at the bottom of the outer-layer stainless steel sleeve, the water outlet is arranged at the top of the outer-layer stainless steel sleeve, water in the constant temperature water bath box enters the cavity between the inner-layer stainless steel sleeve and the outer-layer stainless steel sleeve through the water inlet, and then returns to the constant temperature water bath box from the water outlet to heat the spherical explosion tank in a water bath.
4. The confined space methane hydrogenation explosion characteristic test platform as claimed in claim 1, wherein an openable and closable sealing cover is arranged on the spherical explosion tank, and the ignition device is installed on the sealing cover.
5. The method for testing the confined space methane hydrogenation explosion character test platform as claimed in any one of claims 1 to 4, comprising the steps of:
step 1, opening a constant-temperature water bath tank, raising the temperature of water in the constant-temperature water bath tank to a target experiment water bath temperature of a spherical explosion tank, keeping the temperature constant, and introducing the water after the temperature is raised into the spherical explosion tank;
step 2, checking the air tightness of the spherical explosion tank: the method comprises the following steps that a gas channel between a three-way air compressor valve and a spherical explosion tank is closed under the control of a PLC (programmable logic controller), an exhaust valve is closed under the control of the PLC, a vacuum pump valve and a vacuum pressure sensor valve are opened under the control of the PLC, a vacuum pump is started under the control of the PLC to vacuumize the spherical explosion tank to 20kPa, a computer displays that the vacuumizing is completed, the vacuum pump is closed under the control of the PLC, the vacuumizing is stopped, the waiting time is 3 minutes, if the pressure of the spherical explosion tank is lost under the display of the computer, the test is stopped, manual inspection and maintenance are needed, and the step 2 is repeated, so that the good air tightness of the spherical explosion tank is ensured; the three-way air compressor valve and the air compressor are opened under the control of the PLC, the spherical explosion tank is communicated with the air, and after the pressure in the spherical explosion tank reaches a standard atmospheric pressure, the computer displays that the three-way air compressor valve and the air compressor are closed, so that the air tightness test is completed;
step 3, assembling an ignition device: assembling the spherical explosion tank of the ignition device, and after the assembly is finished, performing conductivity test by using a universal meter, wherein the test is passed;
and 4, vacuumizing the spherical explosion tank again: the method comprises the steps that a methane cylinder pressure reducing valve, a methane mass flowmeter, a hydrogen cylinder pressure reducing valve, a hydrogen mass flowmeter, an air cylinder pressure reducing valve and an air mass flowmeter are controlled to be closed through a PLC (programmable logic controller), a four-way scavenging valve and an exhaust valve are controlled to be closed through the PLC, an air compressor valve is adjusted to be switched to a closed state, an experiment is carried out under a standard working condition of 101325Pa, a vacuum pump valve and a vacuum pressure sensor valve are controlled to be opened through the PLC, a vacuum pump is started to vacuumize a spherical explosion tank, negative pressure is pumped to 10Pa, the spherical explosion tank is stopped being vacuumized, and at the moment, the spherical explosion tank can be considered to be completely in a vacuum state;
step 5, filling explosive reaction gas into the spherical explosion tank: the vacuum pump valve is controlled to be closed through the PLC, the methane gas cylinder pressure reducing valve and the methane mass flowmeter are opened, the three-way air compressor valve is adjusted to be switched to enable the spherical explosion tank to be communicated with the four-way scavenging valve, and the flow q of the methane mass flowmeter is set1And methane intake time tFirst of allAdjusting the four-way scavenging valve to switch to a methane passage, filling methane gas with required proportion, closing the methane gas cylinder pressure reducing valve and the methane mass flowmeter, opening the hydrogen cylinder pressure reducing valve and the hydrogen mass flowmeter, keeping the state of the three-way air compressor valve unchanged, and setting the flow q of the hydrogen mass flowmeter2And hydrogen gas intake time tHydrogenAdjusting the four-way scavenging valve to switch to a hydrogen passage, and filling hydrogen with required proportion;
the PLC is used for controlling the closing of the hydrogen cylinder pressure reducing valve and the hydrogen mass flow meter, the opening of the air cylinder pressure reducing valve and the air mass flow meter, the state of the three-way air compressor valve is kept unchanged, and the flow q of the air mass flow meter is set3Adjusting the four-way scavenging valve to switch to an air passage, and filling air as air for balancing air pressure; when the computer displays that the internal pressure of the spherical explosion tank is one standard atmospheric pressure, the PLC controller controls the air bottle pressure reducing valve and the air mass flow meter to be closed, and the pressure of the spherical explosion tank is regulated to be fourSwitching the ventilation valve to a closed non-air supply passage, adjusting the three-way air compressor valve to be switched to a closed state, keeping the opening state of the vacuum pressure sensor valve unchanged, and standing;
step 6, detecting whether the charged explosion reaction gas meets the requirement, after the gas is uniformly mixed, controlling to open an exhaust valve through a PLC (programmable logic controller), discharging a small part of the mixed gas in the spherical explosion tank into a gas storage bag by utilizing pressure difference, closing the exhaust valve, further detecting the volume fractions of methane and hydrogen in the mixed gas by using a gas chromatograph, and determining whether the mixed gas meets the set explosion condition;
step 7, after the explosion reaction gas is filled to meet the requirement, starting a limited space methane hydrogenation explosion characteristic test, sending an ignition instruction by a computer, adjusting a three-way air compressor valve to switch on an air compressor after an explosion pressure sensor collects pressure data, opening the air compressor and an exhaust valve, cleaning residual gas in the spherical explosion tank, adjusting the three-way air compressor valve to switch off after cleaning, and closing the air compressor and the exhaust valve; the computer can obtain the flow q of the methane mass flowmeter set in the step 51Methane inlet time tFirst of allFlow rate q of hydrogen mass flow meter2Hydrogen gas inlet time tHydrogenPressure curve and pressure rise ratio under the conditions.
6. The method for testing the confined space methane hydrogenation explosion characteristic test platform according to claim 5, wherein step 7 is followed by step 8, wherein step 8 is specifically as follows: after the cleaning is finished, opening the sealing cover of the spherical explosion tank, repeating the steps 1 to 7, and changing the flow q of the methane mass flowmeter1Methane inlet time tFirst of allFlow rate q of hydrogen mass flow meter2Hydrogen gas inlet time tHydrogenAnd repeating the experiment to obtain different groups of pressure curves and pressure rise ratio data.
7. The method for testing the confined space methane hydrogenation explosion characteristic test platform according to claim 6, wherein step 9 is performed after step 8, and step 9 is specifically:
and 9, after the experiment is finished, controlling the water in the spherical explosion tank to be discharged from a water outlet by the PLC, cooling the water in the constant-temperature water bath tank to room temperature, then introducing room-temperature water into the cavity of the double-layer hollow stainless steel jacket of the spherical explosion tank until the water fills the cavity between the inner-layer stainless steel jacket and the outer-layer stainless steel jacket, wherein the time required for cooling the spherical explosion tank to the room temperature is t', and cooling the temperature in the spherical explosion tank to the room temperature.
8. The method for testing the confined space methane hydrogenation explosion characteristic test platform as claimed in claim 5, wherein the water inflow velocity v in the step 1 is set to 0.0001m3/s。
9. The method for testing the confined space methane hydrogenation explosion characteristic test platform as claimed in claim 5, wherein the flow q of the methane mass flow meter in the step 5 is q1Flow rate q of hydrogen mass flow meter2The calculation process of (2) is as follows:
A. flow q of methane mass flowmeter1The calculation process of (2):
in methane fuel CH4In the stoichiometric relation, the air in the air bottle consists of 21% by volume of oxygen and 79% by volume of nitrogen, namely 3.76mol of nitrogen in the air containing 1mol of oxygen;
for methane fuel CH4Chemical relation formula
CH4+2(O2+3.76N2)＝CO2+2H2O+752N2
Ideal mole ratio of methane gas to air [ CH4∶(O2+N2)]Ideally 1: 2;
then:
that is to say that the first and second electrodes,
in equations (15) and (16):
[CH4：(O2+N2)]ideal for-the desired molar ratio of methane gas and air;
[CH4：(O2+N2)]practice of-actual molar ratio of methane gas and air;
φ1-the volume fraction of methane gas in the spherical explosion tank,%;
setting the equivalence ratio of methane gas according to experimental requirements
The volume fraction phi of methane gas in the spherical explosion tank can be obtained by the formula (15) and the formula (16)1Then according to phi1The volume V of the methane gas can be obtained by the volume V of the spherical explosion tankFirst of allCalculated by equation (17):
Vfirst of all＝Vφ1 (17)
In formula (17):
Vfirst of allVolume of methane gas fed in, m3；
V-volume of spherical explosion can, m3；
φ1-methane gas in% by volume of the spherical explosive tank;
the purity of the methane gas cylinder is 99.99 percent, and the volume of the methane gas which needs to be introduced actually
Is composed of
Obtaining the volume of methane gas which is actually required to be introduced, and setting the methane gas inlet time t according to the requirementFirst of allThen the flow q of the methane mass flow meter can be obtained by equation (18)1；
In equation (18):
Vfirst of allVolume of methane gas fed in, m3；
q1Flow rate of methane Mass flowmeter, m3/s；
tFirst of all-methane intake time, s;
B. flow q of hydrogen mass flowmeter2The calculation process of (2):
in the stoichiometric relationship for hydrogen fuel, the air in the air bottle consists of 21% oxygen by volume and 79% nitrogen by volume, i.e. 3.76mol nitrogen per 1mol of oxygen in air;
stoichiometric relation for hydrogen fuel
2H2+O2+376N2＝2H2O+376N2
Ideal molar ratio of hydrogen to air [ H2∶(O2+N2)]Ideal for＝2∶1；
Then:
that is to say that the first and second electrodes,
in equations (19) and (20):
[H2∶(O2+N2)]ideal for-the desired molar ratio of hydrogen to air;
[H2∶(O2+N2)]practice of-the actual molar ratio of hydrogen to air;
φ2-the volume fraction of hydrogen gas in the spherical explosion tank,%;
setting the hydrogen gas equivalence ratio according to the experiment requirements
The volume fraction phi of hydrogen in the spherical explosion tank can be obtained from the equations (19) and (20)2Then according to phi2The volume V of the introduced hydrogen gas can be determined from the internal volume V of the spherical explosion tankHydrogenCalculated by the following formula
VHydrogen＝Vφ2 (21)
In the formula (21), the first and second groups,
VhydrogenVolume of hydrogen gas fed in, m3；
V-volume of spherical explosion can, m3；
φ2-the volume fraction of hydrogen in the spherical explosive tank,%;
the purity of the hydrogen cylinder is 99.99%, and the volume V 'of the hydrogen gas to be actually introduced'HydrogenIs composed of
V′Hydrogen＝VHydrogen÷99.99％(m3)
Obtaining the volume V 'actually fed with hydrogen gas'HydrogenSetting the hydrogen gas intake time t as requiredHydrogenThe flow rate q of the hydrogen mass flow meter can be calculated by the formula (22)2；
In equation (22):
V′hydrogenVolume of actual hydrogen gas fed, m3；
VHydrogenThe volume of hydrogen gas required to be introduced, m3；
q2Flow of hydrogen mass flowmeter, m3/s；
tHydrogen-hydrogen gas intake time, s.
10. The method for testing the confined space methane hydrogenation explosion characteristic test platform as claimed in claim 5, wherein the flow q of the air mass flowmeter in the step 53Set to flow rate q with a methane mass flowmeter1The same is true.
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