CN110075450A - Positive pressure froth fire extinguishing system and foam generating method based on two phase flow driving - Google Patents
Positive pressure froth fire extinguishing system and foam generating method based on two phase flow driving Download PDFInfo
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- CN110075450A CN110075450A CN201910238273.2A CN201910238273A CN110075450A CN 110075450 A CN110075450 A CN 110075450A CN 201910238273 A CN201910238273 A CN 201910238273A CN 110075450 A CN110075450 A CN 110075450A
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- A—HUMAN NECESSITIES
- A62—LIFE-SAVING; FIRE-FIGHTING
- A62C—FIRE-FIGHTING
- A62C31/00—Delivery of fire-extinguishing material
- A62C31/02—Nozzles specially adapted for fire-extinguishing
- A62C31/12—Nozzles specially adapted for fire-extinguishing for delivering foam or atomised foam
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- A—HUMAN NECESSITIES
- A62—LIFE-SAVING; FIRE-FIGHTING
- A62C—FIRE-FIGHTING
- A62C37/00—Control of fire-fighting equipment
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- A—HUMAN NECESSITIES
- A62—LIFE-SAVING; FIRE-FIGHTING
- A62C—FIRE-FIGHTING
- A62C5/00—Making of fire-extinguishing materials immediately before use
- A62C5/02—Making of fire-extinguishing materials immediately before use of foam
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- Public Health (AREA)
- Business, Economics & Management (AREA)
- Emergency Management (AREA)
- Fire-Extinguishing By Fire Departments, And Fire-Extinguishing Equipment And Control Thereof (AREA)
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Abstract
The present invention provides a kind of positive pressure froth fire extinguishing system and foam generating method based on two phase flow driving, and mainly solving the problems, such as existing positive pressure froth fire extinguishing system, the device is complicated, reliability is low, air demand is limited, driving medium and foam mixing liquid mixing are non-uniform.In the system, liquid storage tank respectively with the first gasifier, the second gasifier and liquid piping connection；For the outlet medium of first gasifier for driving Pneumatic water pump to rotate, the medium after driving work enters the second foam chamber, and the import of Pneumatic water pump is connect with water tank, and outlet is connect with the import of froth ratio container；Vapor liquid equilibrium two phase flow is generated after the outlet of second gasifier and the outlet of liquid pipeline are in parallel, vapor liquid equilibrium two phase flow enters the import of the first foam chamber；Foam dope storage tank is connect with froth ratio container；Froth ratio container is connect with the first foam chamber；First foam chamber is connect with the second foam chamber, and the second foam chamber connects injection apparatus.
Description
Technical field
The present invention relates to fire engineering froth fire extinguishing systems, and in particular to it is a kind of based on two phase flow driving positive pressure foam go out
Fiery system and foam generating method, the system and method are for putting out flammable liquid or solid fire.
Background technique
With the development of China's national economy, the quantity and scale of Large Size Oil Storage Tank are also increasing, increase, part area
The crude oil aggregate storage capacity in domain reaches thousands of ten thousand steres.From the eighties in last century, the whole world has added up that more than 600 storage tank accidents occur,
Fire once occurs for the more accident explanations such as Dalian crude oil storage tank area " 7.16 " fire, oil product storage tank, and loss will be very heavy, closely
Disaster.Ultra-high voltage transformer station is the highest voltage level substation of China in Recent Years construction, the big, conveying capacity with capacity
The advantages that strong, has critical role in power grid.But ultra-high voltage transformer station is mainly characterized in that transformer oil storage amount is big, fire danger
It is dangerous big.The single-phase device oil mass of the main transformer of ultra-high voltage transformer station is usually in 170t or more, once fire incident occurs, it can be to electricity
The stable operation of net damages, and influences normal social economic order, therefore there is an urgent need to promote ultra-high voltage transformer station fire water
It is flat.
Foam is to put out control B class (liquid such as crude oil, diesel oil, transformer oil) most effective means of fire, such as Dalian
" 7.16 " tank area fire incident consumption foam solution is up to 1000 tons or more.Since traditional suction type froth fire extinguishing system foam is steady
Qualitative poor, proportion of goods damageds height, positive pressure foam fire extinguishing technique become the trend of development.Positive pressure foam fire extinguishing technique mostly uses compression at present
Air is as driving foamed gas, but there are combustion-supporting effects for the oxygen in air, and inert gas driving is used to generate foam, energy
Enough fire-fighting efficiencies for further promoting positive pressure fire-fighting technique.
There are three types of gas source supply modes in positive pressure froth fire extinguishing system both at home and abroad at present, and one is air compressor machine supplies, need
The driving air compressor machine work of the external power sources such as electric power or diesel engine, petrol engine is wanted, continuous high pressure gas is generated；Second
Kind is compressed gas cylinder supply, and compressed gas cylinder belongs to high pressure volume, and pressure store is mostly in 10MPa or more；The third is using liquefaction
Medium supply, has the characteristics that pressure store is low, supply amount is big；In three of the above mode, supplied using air compressor machine as gas source
To needing electric power or other external power sources to drive, cause system equipment complexity, reliability low, it is unsuitable without extraneous power supply or outer
The scene that boundary's power supply is easily destroyed, and the unattended fire-fighting system of low-power consumption is following developing direction.Using compressed gas cylinder
The mode of supply is limited to the volume of compressed gas gas cylinder, and it is limited to provide tolerance, cannot continuously provide a large amount of compressed gas in time
Body is unable to satisfy the demand in the fighting of large-sized fire scene to big flow foam.Using liquefied medium as supply gas source research
It is less, and directly driven using liquefied medium and generate positive pressure foam, there are driving medium and foams mix in foam chamber
Liquid mixing non-uniform phenomenon, it is too low to easily lead to local temperature drop, and frost plugging phenomenon occurs.
Summary of the invention
The purpose of the present invention is first is that solve existing positive pressure froth fire extinguishing system in such a way that air compressor machine is as gas source supply
It needs electric power or other external power sources to drive, leads to the problem that the device is complicated, reliability is low；Second is that solving existing positive pressure foam
That there are air demands is limited using compressed gas cylinder supply mode for fire extinguishing system, cannot continuously provide asking for a large amount of compressed gas in time
Topic；Drive medium and foam mixing liquid mixed third is that solving existing positive pressure froth fire extinguishing system and existing using liquefied medium supply mode
The problem of closing that uneven, to easily lead to local temperature drop too low, frost plugging phenomenon occur, provide it is a kind of based on two phase flow driving just
Press froth fire extinguishing system and foam generating method.
Technical solution of the invention is as follows:
A kind of positive pressure froth fire extinguishing system based on two phase flow driving, including liquid storage tank, the first gasifier, the second gasification
Device, Pneumatic water pump, foam dope storage tank, froth ratio container, the first foam chamber and the second foam chamber；The liquid
The outlet of storage tank is connect with the import of the first gasifier, the second gasifier and liquid pipeline respectively, and liquid outlet with
Pressure regulator valve is provided on pipeline between second gasifier import；The outlet medium of first gasifier is for driving pneumatic water
Pump rotation, the medium after driving work enter the second foam chamber, and the import of the Pneumatic water pump connect with water tank, export and
The import of froth ratio container connects；Vapor liquid equilibrium is generated after the outlet of second gasifier and the outlet of liquid pipeline are in parallel
Two phase flow, vapor liquid equilibrium two phase flow enters the import of the first foam chamber, and the outlet medium of the second gasifier is for driving
Foam dope storage tank generates foam；The outlet of the foam dope storage tank is connect with the import of froth ratio container, by water and bubble
Foam stoste is mixed to get foam mixing liquid；The outlet of the froth ratio container is connect with the import of the first foam chamber；Institute
The outlet for stating the first foam chamber is connect with the import of the second foam chamber, and the outlet of the second foam chamber connects injection
Device.
Further, first foam chamber includes shell, mixed liquor inlet tube and multiple groups equiulbrium flow inlet tube；Institute
The end face of mixed liquor inlet tube insertion shell is stated, one end protrudes into shell cavity；Multiple groups equiulbrium flow inlet tube is inserted into shell
End face, one end also protrude into shell cavity, and during multiple groups equiulbrium flow inlet tube is uniformly arranged on mixed liquor inlet tube and is
On the circumference of the heart.
Further, the end-enclosed of the intracorporal mixed liquor inlet tube of housing chamber is protruded into, and is provided on its tube wall multiple
Foam through-hole, multiple foam through-holes are circumferentially arranged, axial arranging；The end face for protruding into the intracorporal equiulbrium flow inlet tube of housing chamber is
Inclined-plane is provided with multiple oblique angle through-holes on the inclined-plane, is converged by the medium of multiple oblique angle through-holes in shell longitudinal center line.
Further, gas-liquid is additionally provided in the outlet of second gasifier and the inlet ductwork of the first foam chamber
Impeller, the gas-liquid impeller include outer barrel and multiple rotating vanes, and the multiple rotating vane setting exists
In outer barrel.
Further, second foam chamber includes the outer sleeve body and interior set body of coaxial arrangement, the outer sleeve body
It is provided with the gaseous state import of gaseous medium entrance on barrel, is provided with multiple mix apertures on the interior set body barrel.
Further, deflector is additionally provided between first foam chamber and the second foam chamber.
Further, it is also connected with refrigeration compressor on the liquid storage tank, for increasing to the medium in liquid storage tank
It presses and freezes, be provided with safety valve and pressure sensor on the tank body of the liquid storage tank.
Further, the outlet of second foam chamber is provided with injection apparatus, and the injection apparatus is foam gun
And foam nozzle.
Further, control valve and fluid flow are provided on the pipeline between the liquid storage tank and the first gasifier
Meter；Control valve and gas flowmeter are additionally provided on pipeline between the liquid outlet and the second gasifier import；Institute
It states and is provided with pressure sensor and fluid flowmeter between the first gasifier and Pneumatic water pump；The outlet of the Pneumatic water pump and
Fluid flowmeter, control valve and check valve are provided between two foam chambers；The outlet of the Pneumatic water pump and froth ratio
Pressure sensor, control valve and check valve are provided on pipeline between container；Pressure sensing is provided on the liquid pipeline
Device, temperature sensor and fluid flowmeter；Pressure is provided on pipeline between second gasifier and the first foam chamber
Force snesor, temperature sensor, check valve and control valve；On pipeline between second gasifier and foam dope storage tank also
It is provided with gas flowmeter and pressure regulator valve；It is arranged on pipeline between the outlet and froth ratio container of the foam dope storage tank
There are control valve, fluid flowmeter, check valve and pressure sensor；Between the froth ratio container and the first foam chamber
Dry and wet regulating valve, fluid flowmeter are provided on pipeline.
Meanwhile the present invention also provides a kind of foam generation sides of positive pressure froth fire extinguishing system based on two phase flow driving
Method, comprising the following steps:
1) vapor liquid equilibrium two phase flow is converted by liquid medium；
2) water and foam dope are mixed to get foam mixing liquid；
3) foam mixing liquid that step 1) obtains vapor liquid equilibrium two phase flow and step 2) obtains is mixed to get foam two phase flow；
4) the foam two phase flow that step 3) obtains is mixed with gaseous medium, obtains fire foam.
Compared with prior art, the present invention beneficial effect is:
1. the gas-liquid two-phase equiulbrium flow of present system and the gas-liquid mixed of foam mixing liquid are taken and mixed twice, for the first time
Strengthen mixing in a manner of rotating peripheric jet flow in the first foam chamber, generates the non-uniform gas source foam two phase flow of size；
Strengthen mixing in a manner of porous lateral jet mixing in the second foam chamber for the second time, generates the better gas source bubble of stability
Foam two phase flow.Foam is generated in such a way that gas-liquid two-phase equiulbrium flow is mixed with foam mixing liquid, the foam size of generation is more equal
It is even, have the characteristics that remote without combustion-supporting ingredient, spray distance in foam, the better gas source foam two phase flow of stability can pass through
Pipeline within 40m is sprayed onto fire source to injection apparatus.
2. present system using liquid medium as gas source, introduces the second gasifier, gas source is made to enter the first foam hair
Partial gasification before raw room, gas source state is vapor liquid equilibrium two phase flow after the second gasifier, passes through fluid flowmeter and tune
Pressure valve controls the rate of gasification of gas source, and gas source enters the first foam chamber with the state of two phase flow, on the one hand improves gas source and sprays into
The momentum of foam chamber strengthens the mixing of gas source and foam mixing liquid, avoids local overcooling, and freezing phenomena occurs, influences to steep
The quality and plugging occurs that foam generates；On the other hand, the caloric receptivity of gas source is greatly reduced in gas source partial gasification, and it is mixed to reduce foam
The temperature drop for closing liquid, can be improved the coefficient of foaming of the system.
3. present system, as gas source supply mode, is needed by lesser equipment storing liquid gas source in fire extinguishing system
Huge air compressor or air compressor unit can be replaced when big flow gas, whole system supplies energy without exterior power
Operation generates foam.Meanwhile liquid gas source of the invention can be processed by collecting source gas in atmospheric environment, make gas source gas
Body is recycled, and the intensity of greenhouse effects is weakened.
4. the Pneumatic water pump of present system, foam dope storage tank, pressure regulator valve etc. are all made of the gas source after gasification as dynamic
Power drive work, without using the extraneous auxiliary high power plant such as motor, diesel engine, petrol engine, so that being
System simple and compact device, high reliablity is easy to install and use, is suitble to the scene being easily destroyed without extraneous power supply or extraneous power supply,
Easily realize that low-power consumption is unattended.
Detailed description of the invention
Fig. 1 is that the present invention is based on the positive pressure froth fire extinguishing system schematic diagrames that two phase flow drives；
Fig. 2 is that the present invention is based on the positive pressure froth fire extinguishing system control schematic diagrams that two phase flow drives；
Fig. 3 is the structural schematic diagram of the first foam chamber in present system；
Fig. 4 is the sectional view of the A-A of Fig. 3；
Fig. 5 is the second foam chamber structure chart in present system；
Fig. 6 is the rotating vane structural schematic diagram of gas-liquid impeller in present system.
Appended drawing reference: 1- liquid storage tank, 2- refrigeration compressor, 3- safety valve, 4- control valve, 5- pressure sensor, 6- temperature
Spend sensor, 7- fluid flowmeter, 8- pressure regulator valve, the first gasifier of 9-, the second gasifier of 10-, 11- gas flowmeter, 12- gas
Liquid impeller, 13- check valve, 14- foam dope storage tank, 15- froth ratio container, 16- dry and wet regulating valve, 17- water tank,
18- Pneumatic water pump, the first foam chamber of 19-, 20- deflector, the second foam chamber of 21-, 22- injection apparatus, 23- intelligence
Control cabinet, 24- liquid pipeline, 91- shell, 92- mixed liquor inlet tube, 93- equiulbrium flow inlet tube, 94- foam through-hole, 95- are oblique
Angle through-hole, 101- outer sleeve body, 102- interior set body, 103- mix aperture, 104- gaseous state import.
Specific embodiment
The present invention provides the method and system of a kind of gas-liquid two-phase equiulbrium flow and foaming foam material mixing generation foam, this is
CO in system2It is the CO in the first foam chamber for the first time with foam mixing liquid using hybrid mode twice2Gas-liquid two-phase balance
The mixing of stream and foam mixing liquid, hybrid mode are porous axial rotating jet mixing；It is in the second foam chamber for the second time
It is interior, gaseous state CO2With after one step foaming foam carry out it is secondary mix, hybrid mode be porous lateral jet mixing；Wherein first
Foam chamber pressure is higher, and the second foam chamber pressure is lower, the bubble for generating system by way of this secondary mixing
More evenly, the control and regulation of expansion ratio are more flexible and convenient for foam size.CO proposed by the present invention2Gas-liquid two-phase equiulbrium flow conduct
Gas source, is also possible to the gas-liquid two-phase equiulbrium flow of at least one of nitrogen, inert gas etc., with CO in this implementation2For.
Positive pressure froth fire extinguishing system based on two phase flow driving as depicted in figs. 1 and 2, including liquid storage tank 1, the first gas
Change device 9, the second gasifier 10, Pneumatic water pump 18, foam dope storage tank 14, froth ratio container 15, the first foam chamber 19
With the second foam chamber 21；Refrigeration compressor 2 is connected on liquid storage tank 1, for increasing to the medium in liquid storage tank
It presses and freezes, be provided with safety valve 3 and pressure sensor 5 on the tank body of liquid storage tank 1.The outlet of liquid storage tank 1 is respectively with
One gasifier 9, the second gasifier 10 are connected with the import of liquid pipeline 24, and the outlet of liquid storage tank 1 and the second gasifier 10
Pressure regulator valve 8 is provided on pipeline between import；The outlet medium of first gasifier 9 drives for driving Pneumatic water pump 18 to rotate
The medium after making of starting building enters the second foam chamber 21 and occurs second and mixes, and the import of Pneumatic water pump 18 and water tank 17 connect
It connects, outlet is connect with the import of froth ratio container 15；After the outlet of second gasifier 10 and the outlet of liquid pipeline 24 are in parallel
Vapor liquid equilibrium two phase flow is generated, the import that vapor liquid equilibrium two phase flow enters the first foam chamber 19 occurs to mix for the first time.Together
When, the outlet medium of the second gasifier 10 is for driving foam dope storage tank 14 to generate foam；The outlet of foam dope storage tank 14
It is connect with the import of froth ratio container 15, water and foam dope is mixed to get foam mixing liquid；Froth ratio container 15
Outlet is connect with the import of the first foam chamber 19；The outlet of first foam chamber 19 and second foam chamber 21 into
Mouth connection, the outlet of the second foam chamber 21 connect injection apparatus 22, and injection apparatus is foam gun and foam nozzle.The present invention
It is required that at least two independent gasifiers of setting, the first gasifier 9 are used to be generated into the CO of the first foam chamber 192Gas
Body, the second gasifier 10 are used to generate the high pressure CO of the work such as driving Pneumatic water pump 18, operated pneumatic valve2Gas (2MPa or more).
In above system, detecting element and measuring cell are respectively provided on the pipeline between each component, and intelligent control
Cabinet 23 connects, in real time and the pressure of each device of accurate detection, temperature, flow and controlling the aperture of each pipeline and opening
It closes.It is specifically provided that on the pipeline between liquid storage tank 1 and the first gasifier 9 and is provided with control valve 4 and fluid flowmeter 7；
Control valve 4 and gas flowmeter 11 are additionally provided on pipeline between the outlet of liquid storage tank 1 and 10 import of the second gasifier；First
Pressure sensor 5 and fluid flowmeter 7 are provided between gasifier 9 and Pneumatic water pump 18；The outlet of Pneumatic water pump 18 and second
Fluid flowmeter 7, control valve 4 and check valve 13 are provided between foam chamber 21；The outlet of Pneumatic water pump 18 and foam ratio
Pressure sensor 5, control valve 4 and check valve 13 are provided on pipeline between example container 15；The parallel pipeline of first gasifier 9
On be provided with pressure sensor 5, temperature sensor 6 and fluid flowmeter 7；Second gasifier 10 and the first foam chamber 19 it
Between pipeline on be provided with pressure sensor 5, temperature sensor 6, check valve 13 and control valve 4；Second gasifier 10 and foam
Gas flowmeter 11 and pressure regulator valve 8 are additionally provided on pipeline between stoste storage tank 14；The outlet of foam dope storage tank 14 and bubble
Control valve 4, fluid flowmeter 7, check valve 13 and pressure sensor 5 are provided on pipeline between foam ratio container 15；Foam
Dry and wet regulating valve 16, fluid flowmeter 7 are provided on pipeline between ratio container 15 and the first foam chamber 19.
As shown in fig. 6, being additionally provided with gas in the outlet of the second gasifier 10 and the inlet ductwork of the first foam chamber 19
Liquid impeller 12, gas-liquid impeller 12 include outer barrel and multiple rotating vanes, and multiple rotating vane settings are outside
In cylinder.CO2Gas-liquid two-phase equiulbrium flow is generated by the mixing of gas-liquid impeller 12, avoids generating CO2Two phase flow layering is existing
As.The specific structure of cyclone mixer is that rotating vane is arranged in pipeline, and the biphase gas and liquid flow of layering is made to re-start mixing,
After the rotation of drive of high-pressure gas rotating vane, the liquid phase in lower part can arrive top, and can arrive lower part in the gas phase on top, in gravity
Under the action of this two meet and re-mix.
As shown in Figure 3, Figure 4, the first foam chamber 19 includes that shell 91, mixed liquor inlet tube 92 and multiple groups balance flow into
Mouth pipe 93；Mixed liquor inlet tube 92 is inserted into the end face of shell 91, and one end protrudes into 91 cavity of shell；Multiple groups equiulbrium flow inlet tube
The end face of 93 insertion shells 91, one end also protrudes into 91 cavity of shell, and multiple groups equiulbrium flow inlet tube 93 is uniformly arranged on
On circumference centered on mixed liquor inlet tube 92, specifically, protruding into the end of the intracorporal mixed liquor inlet tube 92 of 91 chamber of shell
Closing, and multiple through-holes are provided on its tube wall, multiple through-holes are circumferentially arranged, axial arranging；It is intracorporal to protrude into 91 chamber of shell
The end face of equiulbrium flow inlet tube 93 is inclined-plane, is provided with multiple oblique angle through-holes 95 on inclined-plane, this two distinct types of hole is matched
It closes and realizes porous axial rotating jet mixing.CO of the present invention2Gas-liquid two-phase equiulbrium flow and foaming substance are in the first foam chamber
19 strengthen mixing in a manner of axial-rotation peripheric jet flow.The oblique angle through-hole 95 and equiulbrium flow of 93 end face of multiple groups equiulbrium flow inlet tube
The end face of inlet tube 93 is arranged at an angle, so that by the vapor liquid equilibrium two phase flow of oblique angle through-hole 95 in 91 central axis of shell
Converge on line, and also sprayed at 91 center of shell by the foam mixing liquid of mixed liquor inlet tube 92, so that foam mixing liquid
Also it is flowed through on 91 central axis of shell, two kinds of liquid are sufficiently mixed on 91 central axis of shell at this time, so that mixing is more
Uniformly, the optimized angle of the inclined-plane of equiulbrium flow inlet tube 93 and 91 central axis of shell is 30 ° -60 °.
As shown in figure 5, the second foam chamber 21 includes the outer sleeve body 101 and interior set body 102 of coaxial arrangement, outer sleeve body
It is provided with gaseous medium on 101 barrel and enters gaseous state import 104, is provided with multiple mix apertures on 102 barrel of interior set body
103.CO of the present invention2Foam two phase flow and CO2Gas is strengthened in a manner of porous lateral jet mixing mixed in the second foam chamber 21
It closes, i.e. gaseous state CO2It is injected by the mix aperture 103 of interior set body 102 in radial direction, and foam mixing liquid is then directly along interior set body
102 axial injection, gaseous state CO2It is sufficiently mixed in interior set body 102 with foam mixing liquid, realizes porous lateral jet mixing side
Formula.
Deflector 20 is additionally provided between first foam chamber 19 and the second foam chamber 21.The system is in CO2Gas
After liquid biphase equilibrium stream mixes generation foam with foaming substance for the first time, foam is transported using deflector 20 and is sent out into the second foam
Raw room 21 carries out CO2Gas is mixed with the secondary of foam, more evenly by the foam size after deflector 20.
Present system is with liquid CO2As gas source, the second gasifier 10 is introduced, CO is made2Entering the first foam chamber
Partial gasification before 19, the CO after the second gasifier 102State is vapor liquid equilibrium two phase flow, by fluid flowmeter 7 and is adjusted
Pressure valve 8 controls CO2Rate of gasification, CO2Enter the first foam chamber 19 with the state of two phase flow, on the one hand improves CO2Spray into bubble
The momentum of room occurs for foam, strengthens CO2With the mixing of foam mixing liquid, local overcooling is avoided, freezing phenomena occurs, it is raw to influence foam
At quality and occur plugging；On the other hand, CO2CO is greatly reduced in partial gasification2Caloric receptivity, reduce the temperature of foam mixing liquid
Drop, can be improved the coefficient of foaming of the system.
Present system is with liquid CO2CO after gasification2Gas-liquid two-phase equiulbrium flow is gas source, liquid CO2Volume is swollen after gasification
It is swollen, the CO of generation2Gas is far more than liquid CO2Original volume, the liquid CO of 1 volume2The CO of about 600 volumes can be generated after gasification2
Gas then can be achieved by compared with skinny device storing liquid CO2Generate the CO of big flow2Gas.
The present invention proposes to utilize liquid CO2CO after gasification2(pressure is used as power, driving in 2MPa or more) to high pressure gas
Foam dope is discharged in foam dope storage tank 14, and driving Pneumatic water pump 18 works, and the conveying of water is realized, so that whole system is only with weak
Electricity supply can operate normally, and provide power without extraneous motor, diesel engine, petrol engine etc..Present system
Water pump, foam dope storage tank 14, pressure regulator valve 8 etc. be all made of the CO after gasification2It works as power drive, without using electronic
The extraneous auxiliary high power plant such as machine, diesel engine, petrol engine, facility compact, high reliablity, the side of installing and using
Just, it is suitble to the scene being easily destroyed without extraneous power supply or extraneous power supply, Yi Shixian low-power consumption is unattended.
The present invention proposes to use CO2The Pneumatic water pump 18 of driving conveys liquid water, drives relative to conventional high-pressure storage tank
Mode, the CO after Pneumatic water pump 18, after driving pump working2Gas can be used again, and be occurred into the second foam
Room 21 participates in the generation of foam.The present invention installs fluid flowmeter 7 and pneumatic control pressure regulator valve 8, gas in the entrance of gasifier
Movable valve is also using CO after gasification2It drives, the gas liquid ratio of first foam chamber 19 is entered by PLC program control.
The process that present system generates foam is: starting liquid CO first on Intelligent control cabinet 232Outlet pipe
Control valve 4 on road, while starting pressure sensor 5, temperature sensor 6, fluid flowmeter 7, gas flowmeter 11 etc., make liquid
State CO2By a certain amount of liquid CO after fluid flowmeter 7 and pneumatic control valve 42It is transported to the second vaporizer and generates certain body
Long-pending CO2Gas can adjust CO by fluid flowmeter 7 and pneumatic control valve 42Rate of gasification, after the second gasifier 10
CO2State is vapor liquid equilibrium two phase flow, CO2Vapor liquid equilibrium two phase flow passes through gas-liquid impeller 12 and check valve as gas source
13 enter the first foam chamber 19.A part of high pressure CO after second vaporizer gasification simultaneously2Gas is as power source from another
One pipeline enters foam dope storage tank 14 and displaces foam dope；The foam dope displaced is obtained by control valve 4 and fluid flowmeter 7
Enter froth ratio container 15 to a certain amount of foam dope.Wherein foam dope can be protein foam concentrate, fluoroprotein foam
Liquid, water base foam liquid, resists molten fluoro-protein foam concentrate, resists molten aqueous foam-forming solution etc. aqueous foam-forming solution, typically contains a variety of tables
The additives such as face activating agent, stabilizer.
It is another from liquid CO2Liquid CO in the pipeline of storage tank output2It is high pressure CO by gasifying after the first vaporizer2Gas
Body, the high pressure CO to gasify2Gas obtains a certain amount of CO by gas flowmeter 112Gas, the high pressure CO2Gas-powered
Pneumatic water pump 18 conveys liquid water, and liquid water obtains a certain amount of water by control valve 4 and enters froth ratio container 15, and more
Remaining water is returned in the pipeline of air pump input end by branch pipe and is again introduced into Pneumatic water pump 18, then a certain amount of water and a certain amount of
Foam dope a certain proportion of foam mixing liquid is mixed to form in froth ratio container 15.
The CO generated by gas-liquid impeller 122Gas-liquid two-phase equiulbrium flow is mixed to form with by froth ratio container 15
Foam mixing liquid coaxially in the same direction enter the first foam chamber 19 strengthened in a manner of rotating peripheric jet flow mixing generate size
Non-uniform CO2Foam two phase flow.Wherein, CO2The pipeline of gas-liquid two-phase balanced fluid is after entering the first foam chamber 19
What end was opened has the uniform small pores for rotating that tangential diameter is 10-15mm.
CO after Pneumatic water pump 18, after driving pump working2Gas can be used again into the second foam and send out
Raw room 21 and the CO for passing through deflector 202Foam two phase flow enters the second foam chamber 21 and carries out secondary mixing, CO at this time2
Foam two phase flow and CO2Gas is strengthened mixing in a manner of porous lateral jet mixing in the second foam chamber 21 and generates stabilization
The better CO of performance2Foam two phase flow, the better CO of stability2Foam two phase flow refers to that foam is uniform in size, foam duration
Time is longer, more difficult rupture, thus good extinguishing effect.
The better CO of stability2Foam two phase flow can be by pipeline within 40m to injection apparatus, within 40m
Pipeline in CO2 foam two phase flow when, foam and CO2Gas also will do it sufficiently to be mixed repeatedly, is equivalent to and has been carried out
It mixes three times, so that the better CO of stability will be formed before ejection2Foam two phase flow, injection apparatus eject CO2Foam two
Fire source is mutually flowed to, wherein injection apparatus can be foam gun, bubble jet head etc..
Claims (10)
1. a kind of positive pressure froth fire extinguishing system based on two phase flow driving, it is characterised in that: including liquid storage tank (1), the first gas
Change device (9), the second gasifier (10), Pneumatic water pump (18), foam dope storage tank (14), froth ratio container (15), the first bubble
Room (19) and the second foam chamber (21) occur for foam；
The outlet of the liquid storage tank (1) respectively with the first gasifier (9), the second gasifier (10) and liquid pipeline (24) into
Mouth connection, and pressure regulator valve (8) are provided on the pipeline between liquid storage tank (1) outlet and the second gasifier (10) import；
For driving Pneumatic water pump (18) to rotate, the medium after driving work enters the outlet medium of first gasifier (9)
The import of second foam chamber (21), the Pneumatic water pump (18) is connect with water tank (17), outlet and froth ratio container
(15) import connection；
Vapor liquid equilibrium two phase flow, gas-liquid are generated after the outlet of second gasifier (10) and the outlet of liquid pipeline (24) are in parallel
The import that two phase flow enters the first foam chamber (19) is balanced, and the outlet medium of the second gasifier (10) is for driving foam
Stoste storage tank (14) generates foam；The outlet of the foam dope storage tank (14) is connect with the import of froth ratio container (15),
Water and foam dope are mixed to get foam mixing liquid；The outlet of the froth ratio container (15) and the first foam chamber
(19) import connection；The outlet of first foam chamber (19) is connect with the import of the second foam chamber (21), the
The outlet of two foam chambers (21) connects injection apparatus (22).
2. the positive pressure froth fire extinguishing system according to claim 1 based on two phase flow driving, it is characterised in that: described first
Foam chamber (19) includes shell (91), mixed liquor inlet tube (92) and multiple groups equiulbrium flow inlet tube (93)；The mixed liquor
Inlet tube (92) is inserted into the end face of shell (91), and one end protrudes into shell (91) cavity；Multiple groups equiulbrium flow inlet tube (93) is inserted
Enter the end face of shell (91), one end also protrudes into shell (91) cavity, and multiple groups equiulbrium flow inlet tube (93) is uniformly arranged
On the circumference centered on mixed liquor inlet tube (92).
3. the positive pressure froth fire extinguishing system according to claim 2 based on two phase flow driving, it is characterised in that: protrude into shell
(91) end-enclosed of the intracorporal mixed liquor inlet tube (92) of chamber, and multiple foam through-holes (94) are provided on its tube wall, it is multiple
Foam through-hole (94) is circumferentially arranged, axial arranging；The end face for protruding into the intracorporal equiulbrium flow inlet tube (93) of shell (91) chamber is
Inclined-plane is provided with multiple oblique angle through-holes (95) on the inclined-plane, by the medium of multiple oblique angle through-holes (95) in shell (91) axis
Converge to center line.
4. the positive pressure froth fire extinguishing system according to claim 1 or 2 or 3 based on two phase flow driving, it is characterised in that: institute
It states and is additionally provided with gas-liquid impeller in the outlet of the second gasifier (10) and the inlet ductwork of the first foam chamber (19)
(12), the gas-liquid impeller (12) includes outer barrel and multiple rotating vanes, and the multiple rotating vane setting is outside
In cylinder.
5. the positive pressure froth fire extinguishing system according to claim 4 based on two phase flow driving, it is characterised in that: described second
Foam chamber (21) includes the outer sleeve body (101) and interior set body (102) of coaxial arrangement, on the barrel of the outer sleeve body (101)
It is provided with the gaseous state import (104) of gaseous medium entrance, is provided with multiple mix apertures (103) on interior set body (102) barrel.
6. the positive pressure froth fire extinguishing system according to claim 5 based on two phase flow driving, it is characterised in that: described first
Deflector (20) are additionally provided between foam chamber (19) and the second foam chamber (21).
7. the positive pressure froth fire extinguishing system according to claim 6 based on two phase flow driving, it is characterised in that: the liquid
Refrigeration compressor (2) are also connected on storage tank (1), for the medium in liquid storage tank (1) to be pressurized and is freezed, the liquid
Safety valve (3) and pressure sensor (5) are provided on the tank body of state storage tank (1).
8. the positive pressure froth fire extinguishing system according to claim 7 based on two phase flow driving, it is characterised in that: described second
The outlet of foam chamber (21) is provided with injection apparatus (22), and the injection apparatus (22) is foam gun and foam nozzle.
9. the positive pressure froth fire extinguishing system according to claim 8 based on two phase flow driving, it is characterised in that: the liquid
Control valve (4) and fluid flowmeter (7) are provided on pipeline between storage tank (1) and the first gasifier (9)；The liquid storage tank
(1) control valve (4) and gas flowmeter (11) are additionally provided on the pipeline between outlet and the second gasifier (10) import；It is described
Pressure sensor (5) and fluid flowmeter (7) are provided on pipeline between first gasifier (9) and Pneumatic water pump (18)；Institute
It states and is provided with fluid flowmeter (7), control on the pipeline between the outlet of Pneumatic water pump (18) and the second foam chamber (21)
Valve (4) and check valve (13)；It is provided on pipeline between the outlet and froth ratio container (15) of the Pneumatic water pump (18)
Pressure sensor (5), control valve (4) and check valve (13)；
Pressure sensor (5), temperature sensor (6) and fluid flowmeter (7) are provided on the liquid pipeline (24)；Described
Pressure sensor (5), temperature sensor are provided on pipeline between two gasifiers (10) and the first foam chamber (19)
(6), check valve (13) and control valve (4)；On pipeline between second gasifier (10) and foam dope storage tank (14) also
It is provided with gas flowmeter (11) and pressure regulator valve (8)；The outlet and froth ratio container (15) of the foam dope storage tank (14)
Between pipeline on be provided with control valve (4), fluid flowmeter (7), check valve (13) and pressure sensor (5)；The foam
Dry and wet regulating valve (16), fluid flowmeter are provided on pipeline between ratio container (15) and the first foam chamber (19)
(7)。
10. it is a kind of based on two phase flow driving positive pressure froth fire extinguishing system foam generating method, which is characterized in that including with
Lower step:
1) vapor liquid equilibrium two phase flow is converted by liquid medium；
2) water and foam dope are mixed to get foam mixing liquid；
3) foam mixing liquid that step 1) obtains vapor liquid equilibrium two phase flow and step 2) obtains is mixed to get foam two phase flow；
4) the foam two phase flow that step 3) obtains is mixed with gaseous medium, obtains fire foam.
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| CN201910238273.2A CN110075450B (en) | 2019-03-27 | 2019-03-27 | Positive-pressure foam fire extinguishing system based on two-phase flow driving and foam generating method |
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