阅读说明：本技术 一种预混气体可燃极限测量装置与方法 (A kind of premixed gas Flammability limits measuring device and method ) 是由 胡贤忠 张娟 谢清华 梁容真 阎富生 于 2019-08-27 设计创作，主要内容包括：一种预混气体可燃极限测量装置与方法,其属于气体可燃极限研究领域。该测量装置包括球形燃烧弹、真空泵、油泵、点火电极、耐温压力传感器、温度传感器、工控机及配气系统。测量容积为5L的小型球形燃烧弹,球形燃烧弹外层具有保温层,该球形燃烧弹为一空腔的双层结构,空腔内充满加热油。工控机可实时监测内腔里气体温度、压力的变化情况。本发明是测量常、高温下,并利用压升7％来判断着火上极限和下极限。只采集混合气体的压力和温度减小了试验的繁杂性,提高实验效率,还可实现非常压下混合气体可燃极限的测量。本装置可为防止可燃气体运输爆炸、气体突然熄火等情况提供可靠参考数据。(A kind of premixed gas Flammability limits measuring device and method, belong to gaseous combustible limit research field.The measuring device includes spherical firebomb, vacuum pump, oil pump, ignitor, heatproof pressure sensor, temperature sensor, industrial personal computer and air distribution system.The small ball-shape firebomb that volume is 5L is measured, spherical firebomb outer layer has insulating layer, which is the double-layer structure of a cavity, and cavity is interior full of heating oil.Industrial personal computer can gas temperature in real-time monitoring inner cavity, pressure situation of change.The present invention is to measure under normal, high temperature, and rise 7% using pressure to judge catch fire limes superiors and limit inferior.Only the pressure and temperature of acquisition mixed gas reduces the complex of test, improves conventional efficient, can also be achieved the measurement for depressing very much mixed gas Flammability limits.The present apparatus can provide reliable reference data to prevent fuel gas from transporting situations such as explosion, gas stop working suddenly.)

1. a kind of premixed gas Flammability limits measuring device, which is characterized in that including spherical firebomb, ignitor, electric cabinet, work Control machine, vacuum pump, oil pump, mixed gas tank, air inlet pipeline, outlet pipe, air distribution system, the spherical shape firebomb is by interior cavity layer, outer Cavity layer, oil inlet, oil outlet, air inlet, gas outlet composition, the outer cavity layer inner cavity is equipped with interior cavity layer, and inner cavity with the centre of sphere Conduction oil is filled in the cavity that layer is surrounded with outer cavity layer, is respectively arranged with oil inlet and oil outlet in outer cavity layer, oil inlet passes through Pipeline is connected with fuel pump outlet end, and oil pump input end is connected by pipeline with oil outlet, opens up respectively on the spherical shape firebomb There are air inlet, gas outlet, pressure measurement mouth and temperature survey mouth, the industrial personal computer is passed with temperature sensor, heatproof pressure respectively Sensor, acquisition solenoid valve and electric cabinet are connected, and the temperature survey mouth that the collection terminal of temperature sensor passes through spherical firebomb enters ball Shape firebomb inner cavity, the pressure measurement mouth that heatproof pressure sensor collection terminal passes through spherical firebomb enter in spherical firebomb Chamber, the air inlet that air inlet pipeline one end passes through spherical firebomb enter spherical firebomb inner cavity, the air inlet pipeline other end and acquisition The outlet end of solenoid valve is connected, acquisition solenoid valve input end by pipeline and threeway one respectively with discouraged pipeline and air distribution system phase Even, described outlet pipe one end enters spherical firebomb inner cavity across spherical firebomb gas outlet, and the outlet pipe other end passes through Threeway two is connected with vent line and vacuum pump respectively, and the electric cabinet output end is connected by conducting wire with ignitor, ignition power Pole one end is arranged on the ring flange of spherical firebomb outer wall, and the other end enters sphere cavity after running through spherical firebomb.

2. a kind of premixed gas Flammability limits measuring device according to claim 1, it is characterised in that: the air distribution system Including gas cylinder A, gas cylinder B, gas cylinder C, air gauge, heating tape, mixed gas tank, check-valves and connecting line, the gas cylinder A, gas cylinder B, Gas cylinder C is connected by connecting line with air gauge one end, and the air gauge other end is connected by connecting line with mixed gas tank import, is mixed Gas tank outlet is connected by connecting line with check-valves one end, and the check-valves other end passes through pipeline and threeway one and acquisition solenoid valve Three are connected, and are enclosed with heating tape on the connecting line.

3. a kind of premixed gas Flammability limits measuring device according to claim 1, it is characterised in that: the oil pump with into Solenoid valve one is installed on the pipeline between hydraulic fluid port；Solenoid valve two is installed on the pipeline between the oil pump and oil outlet.

4. a kind of premixed gas Flammability limits measuring device according to claim 1, it is characterised in that: the discouraged pipeline On ball valve one is installed；Ball valve two is installed on the vent line；It is installed on pipeline between the vacuum pump and threeway two There is ball valve three.

5. a kind of premixed gas Flammability limits measuring device according to claim 2, it is characterised in that: the check-valves with Ball valve four is installed on the connecting line of mixed gas tank.

6. a kind of premixed gas Flammability limits measuring device according to claim 1, it is characterised in that: the conduction oil Temperature is 25-200 DEG C.

7. a kind of premixed gas Flammability limits measuring device according to claim 2, it is characterised in that: the gas cylinder A, gas Storage has combustible gas, combustion-supporting gas and inert gas respectively in bottle B, gas cylinder C.

8. a kind of premixed gas Flammability limits measuring device according to claim 1, it is characterised in that: the spherical burning The outer surface of the outer cavity layer of bullet is enclosed with insulating layer.

9. a kind of premixed gas Flammability limits measuring device according to claim 1, it is characterised in that: the spherical burning The volume of bullet is 5-30L.

10. a kind of premixed gas Flammability limits measurement method, using a kind of premixed gas Flammability limits survey described in claim 1 Measure device, which comprises the following steps:

Step 1, ball valve three is opened, the space that the starting internal cavity layer of vacuum pump surrounds is vacuumized, and multiplicating vacuumizes, until When pressure in interior cavity layer is less than -0.1Mpa, completion is vacuumized, closes vacuum pump and ball valve three；

Step 2, solenoid valve one and solenoid valve two are opened, oil pump is started, conduction oil is flowed through into pipeline and is delivered to outside by oil inlet In the cavity that cavity layer and interior cavity layer are formed, then the conduction oil in cavity flows back into the Oil Guide in oil pump by oil outlet and pipeline It in pipe, repeatedly recycles, and by the temperature of cavity layer in temperature sensor real-time monitoring, and feeds back to industrial personal computer, keep interior cavity layer full Sufficient initial setting conditions close solenoid valve one and solenoid valve two；

Step 3, distribution premixes, and by the ratio between the volume fraction of mixed gas, successively raises seamless in air gauge using partial pressure method Gas in gas cylinder A, gas cylinder B and gas cylinder C is passed through in mixed gas tank by force value, stands 5-10min；

Step 4, ball valve four, check-valves and acquisition solenoid valve are opened, mixed gas surrounds after flowing through air inlet pipeline into inner cavity layer Space in, control igniting is carried out to ignitor by electric cabinet, is supervised in real time by heatproof pressure sensor and temperature sensor The pressure and temperature variations in spherical firebomb are surveyed, and feeds back to industrial personal computer, records pressure and temperature data, determining device The judgment criteria of the kindling of the Flammability limits experiment of interior fuel gas；When the pressure of the reaction gas in spherical firebomb is greater than 6Mpa is less than 10.5Mpa, and when temperature is greater than 300 DEG C, by losing heart, the ball valve one on pipeline 4 carries out explosion-proof discouraged processing.

Technical field

The invention belongs to gaseous combustible limit research field, it is related to a kind of premixed gas Flammability limits measuring device and side Method.

Background technique

Fuel gas encounters heat source formation flame and moment propagates to combustible gas distribution space, simultaneously in explosive range It discharges big calorimetric, generates high temperature and the phenomenon that detonation superpressure leads to damage effect.Fuel gas is inflammable, and reaches quick-fried in its concentration When the fried limit, it can explode under certain conditions.The combustibility and example of the explosion limit in life of fuel gas are very More, some of them bring huge disaster to the mankind, and for example coal mine gas (methane) explodes, and for example gas pipeline leakage is quick-fried It fries.

Flammability limits is to measure the important indicator of combustible gas combustion characteristics, there is extremely important effect for experiment, It is directly related to the safety of the storage transport of fuel, also directly affects the design and operation of burner.It is filled in designed combustion When setting, both wished that fuel can catch fire in time, stablize burning, while also to avoid unnecessary kindling operating condition, such as too early or Kindling, generation suddenly too late is exploded flame-out etc..For that purpose it is necessary to understand the firing range of flammable mixture under different condition, i.e., Flammability limits.

Currently, the domestic research history about Flammability limits is permanent without foreign countries, the measurement method about the flame limit Research is also seldom, and domestic many researchers are dedicated to the research of gas ignition and extinguishing characteristic under pressurized conditions.It is right both at home and abroad It is larger in the usual volume of the measuring device of fuel gas Flammability limits.Although accuracy is higher, there is experimental period longer, disappear Consume the disadvantages of raw material is more, and disassembly is inconvenient.Therefore, the present invention provides a kind of premixed gas Flammability limits measuring device and method.

Summary of the invention

To achieve the goals above, the present invention proposes a kind of premixed gas Flammability limits measuring device, which includes ball Shape firebomb, ignitor, electric cabinet, industrial personal computer, vacuum pump, oil pump, mixed gas tank, air inlet pipeline, outlet pipe, air distribution system, The spherical shape firebomb is made of interior cavity layer, outer cavity layer, oil inlet, oil outlet, air inlet, gas outlet, the outer cavity layer inner cavity Interior cavity layer, and the interior filling conduction oil of cavity that interior cavity layer and outer cavity layer surround are installed with the centre of sphere, are respectively arranged in outer cavity layer Oil inlet and oil outlet, oil inlet are connected by pipeline with fuel pump outlet end, and oil pump input end is connected by pipeline with oil outlet, Air inlet, gas outlet, pressure measurement mouth and temperature survey mouth, the industrial personal computer difference are offered on the spherical shape firebomb respectively It is connected with temperature sensor, heatproof pressure sensor, acquisition solenoid valve and electric cabinet, the collection terminal of temperature sensor passes through spherical combustion The temperature survey mouth for burning bullet enters spherical firebomb inner cavity, and the pressure that heatproof pressure sensor collection terminal passes through spherical firebomb is surveyed Amount mouth enters spherical firebomb inner cavity, and the air inlet that air inlet pipeline one end passes through spherical firebomb enters spherical firebomb inner cavity, The air inlet pipeline other end is connected with the outlet end of acquisition solenoid valve, acquisition solenoid valve input end pass through pipeline and threeway one respectively with Discouraged pipeline and air distribution system are connected, and described outlet pipe one end passes through spherical firebomb gas outlet and enters in spherical firebomb Chamber, the outlet pipe other end are connected with vent line and vacuum pump respectively by threeway two, and the electric cabinet output end passes through conducting wire It is connected with ignitor, ignitor one end is arranged on the ring flange of spherical firebomb outer wall, and the other end is through spherical burning Enter sphere cavity after bullet.

The air distribution system includes gas cylinder A, gas cylinder B, gas cylinder C, air gauge, heating tape, mixed gas tank, check-valves and connecting tube Road, the gas cylinder A, gas cylinder B, gas cylinder C are connected by connecting line with air gauge one end, and the air gauge other end passes through connecting line It is connected with mixed gas tank import, mixed gas tank outlet is connected by connecting line with check-valves one end, and the check-valves other end passes through pipeline And threeway one is connected with acquisition solenoid valve three, is enclosed with heating tape on the connecting line.

Solenoid valve one is installed on the pipeline between the oil pump and oil inlet；Pipeline between the oil pump and oil outlet On solenoid valve two is installed.

The gas outlet road is equipped with ball valve one；Ball valve two is installed on the vent line；The vacuum pump and three Ball valve three is installed on pipeline between logical two；Ball valve four is installed on the connecting line of the check-valves and mixed gas tank.

The temperature of the conduction oil is 25-200 DEG C.

The gas cylinder A, gas cylinder B, storage has combustible gas, combustion-supporting gas and inert gas respectively in gas cylinder C.

The outer surface of the outer cavity layer of the spherical shape firebomb is enclosed with insulating layer.

The volume of the spherical shape firebomb is 5-30L.

A kind of premixed gas Flammability limits measurement method, using a kind of premixed gas Flammability limits measuring device, including with Lower step:

Step 1, ball valve three is opened, the space that the starting internal cavity layer of vacuum pump surrounds is vacuumized, is repeated several times and takes out very Sky closes vacuum pump and ball valve three until vacuumizing completion when the pressure in interior cavity layer is less than -0.1Mpa；

Step 2, solenoid valve one and solenoid valve two are opened, oil pump is started, conduction oil is flowed through into pipeline and is conveyed by oil inlet In the cavity formed to outer cavity layer and interior cavity layer, then the conduction oil in cavity is flow back into oil pump by oil outlet and pipeline It in oil guide pipe, repeatedly recycles, and by the temperature of cavity layer in temperature sensor real-time monitoring, and feeds back to industrial personal computer, make inner cavity Layer meets initial setting conditions, closes solenoid valve one and solenoid valve two；

Step 3, distribution premixes, and by the ratio between the volume fraction of mixed gas, is successively raised in air gauge using partial pressure method Gas in gas cylinder A, gas cylinder B and gas cylinder C is passed through in mixed gas tank by seamless force value, stands 5-10min；

Step 4, ball valve four, check-valves and acquisition solenoid valve are opened, mixed gas enters inner cavity layer after flowing through air inlet pipeline In the space surrounded, control igniting is carried out to ignitor by electric cabinet, it is real by heatproof pressure sensor and temperature sensor When monitor pressure and temperature variations in spherical firebomb, and feed back to industrial personal computer, record pressure and temperature data, determine The judgment criteria of the kindling of the Flammability limits experiment of fuel gas in device；When the pressure of the reaction gas in spherical firebomb is big It is less than 10.5Mpa in 6Mpa, when temperature is greater than 300 DEG C, the ball valve one on pipeline 4 carries out explosion-proof discouraged processing by losing heart.

The invention has the benefit that

1, advantage of the invention is that controllability is evenly heated and reached using inner cavity of the oil pump oil bath to spherical firebomb, And gas is controlled by air gauge and is uniformly mixed, it is controlled and is lighted a fire by control system.

2,7% is risen using pressure to judge catch fire limes superiors and limit inferior.Only the pressure and temperature of acquisition mixed gas reduces The complex of test improves conventional efficient, can also be achieved the measurement for depressing very much mixed gas Flammability limits.

3, cooling gas after reacting may further be used to for oil pump oil bath, realizes fast cooling, carry out the following group test.

4, apparatus of the present invention by increase gas cylinder number, it can be achieved that multicomponent combustion gas Flammability limits measurement；This hair Bright device can also be used to measure the gaseous combustible limit under non-normal temperature and pressure.

5, premixed gas Flammability limits measurement method of the present invention enriches the corresponding measurement method of Flammability limits, after being Different mixed gas are measured, different temperatures and very pressure provide certain reference, and compensating for domestic certain patents can not be real The shortcomings that existing gas pre-mixed, temperature control and homogeneous heating etc., and raw material can be saved.

Detailed description of the invention

Fig. 1 is premixed gas Flammability limits measuring device structural schematic diagram of the present invention；

Fig. 2 is spark ignition schematic illustration of the present invention；

1, interior cavity layer；2, outer cavity layer；3, oil inlet；4, lose heart pipeline；5, oil pump；6, vacuum pump；7, vent line；8, gas Bottle A；9, gas tank is mixed；10, air gauge；11, check-valves；12, solenoid valve is acquired；13, electric cabinet；14, oil outlet；15, heatproof pressure Sensor；16, temperature sensor；17, ignitor；18, industrial personal computer；19, gas cylinder B；20, gas cylinder C, 21, air inlet pipeline；22, Outlet pipe；23, insulating layer.

Specific embodiment

The present invention is described in further detail with reference to the accompanying drawings and examples.

As shown in Figure 1, a kind of premixed gas Flammability limits measuring device, which includes spherical firebomb, ignitor 17, electric cabinet 13, industrial personal computer 18, vacuum pump 6, oil pump 5, mixed gas tank 9, air inlet pipeline 21, outlet pipe 22, air distribution system, it is described Spherical firebomb volume is 5L, is reacting environment under premixed gas high temperature, spherical firebomb is by interior cavity layer 1, outer cavity layer 2, oil inlet Mouth 3, oil outlet 14, air inlet 13, gas outlet composition, outer 2 inner cavity of cavity layer is equipped with interior cavity layer 1, and interior cavity layer 1 with the centre of sphere Conduction oil is filled in the cavity surrounded with outer cavity layer 2, for heating the mixed gas in spherical firebomb, is distinguished in outer cavity layer 2 It is provided with oil inlet 3 and oil outlet 14, oil inlet 3 is connected by pipeline and solenoid valve one with 5 outlet end of oil pump, and oil pump 5 uses The miniature air-cooled formula Heat-transfer Oil Pump of Ry20,5 input end of oil pump are connected by pipeline and solenoid valve two with oil outlet 14, the spherical combustion It burns and offers air inlet 13, gas outlet, pressure measurement mouth and temperature survey mouth respectively in the interior cavity layer 1 and outer cavity layer 2 of bullet, it is described Industrial personal computer 18 is connected with temperature sensor 16, heatproof pressure sensor 15, acquisition solenoid valve 12 and electric cabinet 13 respectively, temperature sensing The temperature survey mouth that the collection terminal of device 16 passes through 2 side wall of outer cavity layer of spherical firebomb is measured by the temperature of interior 1 side wall of cavity layer The inner cavity that mouth enters spherical firebomb is used to monitor the temperature in interior cavity layer 1, and 15 collection terminal of heatproof pressure sensor passes through spherical The pressure measurement mouth of 2 side wall of outer cavity layer of firebomb enters the interior of spherical firebomb by the pressure measurement mouth of interior 1 side wall of cavity layer Chamber is used to monitor the pressure of interior cavity layer 1, and the air inlet that 21 one end of air inlet pipeline passes through 2 side wall of outer cavity layer of spherical firebomb passes through The air inlet of interior 1 side wall of cavity layer enters the inner cavity of spherical firebomb, for premixed gas to be passed through in spherical firebomb, air inlet pipe 21 other end of road is connected with the outlet end of acquisition solenoid valve 12, and the arrival end of acquisition solenoid valve 12 is distinguished by pipeline and threeway one It is connected with discouraged pipeline 4 and air distribution system, ball valve one is installed on the discouraged pipeline 4, described 22 one end of outlet pipe passes through The gas outlet of 2 side wall of outer cavity layer of spherical firebomb enters spherical firebomb inner cavity, outlet by the gas outlet of interior 1 side wall of cavity layer 22 other end of pipeline is connected respectively by threeway two with vent line 7 and vacuum pump 6,13 output end of electric cabinet by conducting wire and Ignitor 17 is connected, and 17 one end of ignitor is arranged on the ring flange of spherical firebomb outer wall, and the other end is through spherical combustion The outer cavity layer 2 and interior cavity layer 1 for burning bullet enter in sphere, and 17 one end of ignitor, which is fixed on flange, mainly guarantees spherical burning The air-tightness of bullet.

The air distribution system includes gas cylinder A8, gas cylinder B19, gas cylinder C20, air gauge 10, heating tape, mixed gas tank 9, ball valve Four, check-valves 11 and connecting line, the gas cylinder A8, gas cylinder B19, gas cylinder C20 pass through connecting line and 10 one end phase of air gauge Even, 10 other end of air gauge is connected by connecting line with mixed 9 import of gas tank, since fuel gas has certain risk, And then mixed gas is sufficiently mixed by mixed gas tank 9, subsequently into spherical firebomb, make its full combustion, mixed gas tank 9 goes out Mouth is connected by connecting line with four one end of ball valve, and four other end of ball valve is connected by connecting line with 11 one end of check-valves, only It returns 11 other end of valve to be connected by connecting line, threeway one with solenoid valve three, check-valves 11 is for preventing premixed gas from falling The phenomenon that stream, is enclosed with heating tape on the connecting line.

The temperature of the conduction oil is 25-200 DEG C, and the temperature of conduction oil is adjusted by oil pump 5, is the anti-of mixed gas Temperature guarantee should be provided.

The gas cylinder A8, gas cylinder B19, storage has combustible gas, combustion-supporting gas and inert gas respectively in gas cylinder C20.

The outer surface of the outer cavity layer 2 of the spherical shape firebomb is enclosed with insulating layer 23, internal temperature when keeping combustion explosion It is constant, can also prophylactic tria high temperature scald, wound experimenter.