CN106880916A - A kind of powered high-lift fire extinguishing equipment Design method of transmission line forest fire - Google Patents
A kind of powered high-lift fire extinguishing equipment Design method of transmission line forest fire Download PDFInfo
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 163
- 239000007921 spray Substances 0.000 claims abstract description 31
- 239000000126 substance Substances 0.000 claims abstract description 12
- 239000003595 mist Substances 0.000 claims abstract description 6
- 230000015556 catabolic process Effects 0.000 claims description 34
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- A—HUMAN NECESSITIES
- A62—LIFE-SAVING; FIRE-FIGHTING
- A62C—FIRE-FIGHTING
- A62C3/00—Fire prevention, containment or extinguishing specially adapted for particular objects or places
- A62C3/02—Fire prevention, containment or extinguishing specially adapted for particular objects or places for area conflagrations, e.g. forest fires, subterranean fires
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- A—HUMAN NECESSITIES
- A62—LIFE-SAVING; FIRE-FIGHTING
- A62C—FIRE-FIGHTING
- A62C27/00—Fire-fighting land vehicles
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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
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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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Abstract
The invention discloses a kind of powered high-lift fire extinguishing equipment Design method of transmission line forest fire, including：Obtain maximum phase voltage；Selection fire extinguishing equipment water mists spray path and fogdrop diameter；Calculate field transmission line forest fire fire extinguishing demand volume；The scope of selection atomizer parameter and shower nozzle input pressure；Calculate fire extinguishing aqua flow in water delivery water band Reynolds number, along stroke pressure loss coefficient, frictional head loss and along stroke pressure loss；Calculate the minimum value of the pump output pressure of fire extinguishing equipment；According to the pump output pressure of fire extinguishing equipment, with reference to fire extinguishing equipment water-aspirator pressure output characteristic curve, pump capacity and pressure are selected.Beneficial effects of the present invention：Fire extinguishing aqua is fully atomized using fine mist spray head, improves the insulating properties of fire extinguishing aqua, realize live-wire fire fighting；Fire-fighting efficiency is improved by adding extinguishing chemical, flow is reduced, so as to realize high-lift fire extinguishing；For the design of the high-lift fire extinguishing equipment of electric transmission line hot-line provides complete, feasible method.
Description
Technical field
The present invention relates to the anti-mountain fire technical field of transmission line of electricity, in particular to a kind of powered height of transmission line forest fire
Lift fire extinguishing equipment Design method.
Background technology
Influenceed by production and living, mountain fire is throughout the overwhelming majority of countries in the world such as Canada, the U.S. and China.Extra-high voltage
AC/DC transmission line there occurs a lot of tripping operations and locking stoppage in transit event because of mountain fire in recent years, and mountain fire has turned into serious and threatened big electricity
The safe operation of net and the new hot issue of social normal power supply.
Transmission line forest fire is carried out and is put out a fire, be to avoid mountain fire from spreading the effective governing measure for causing line tripping, but
Transmission line of electricity voltage is high, and fire water is conductive, and fire extinguishing easily causes personnel's electric shock injures and deaths, it is necessary to carry out live-wire fire fighting.At present, both at home and abroad
The live-wire fire fighting technology for commonly using includes two kinds of gas and dry-chemical fire extinguishing.Extinction using gas method is generally used for indoor fire extinguishing, and
Field transmission line of electricity environment receives wind effect, and gas fluidity is big, it is difficult to large area is settled, it is impossible to put out a fire.Dry chemical extinguishing method base
Principle is covered in physics, it is adaptable to the flat occasion fire extinguishing of combustion front, in the wild, because surface relief is uneven, sprinkling dry powder cannot
To the effective covering of flame, the purpose of fire extinguishing is extremely difficult to, additionally, dry powder is difficult to remote field conveying.Current existing gas
Fire extinguishing and dry-chemical fire extinguishing cannot meet the application requirement of transmission line forest fire live-wire fire fighting.
Fire fighting truck is widely used in fire extinguishing field, but the diameter of up to 40mm of its water-supply-pipe, and water consumption is big, and output pressure is low, and only 1
~2MPa or so, world highest U.S. Pierre Si elevating fire truck lift only 90m, and because fire water is conductive, it is impossible to it is powered
Fire extinguishing.Transmission line forest fire scene is high mountains and precipitous paths, and residing mountain is farsighted more than 100m, and line voltage distribution is high.Fire fighting truck rushes towards power transmission line
Road mountain fire scene, it is impossible to powered high-lift fire extinguishing, often comes back after a vain attempt.
Grid company fails to overcome the powered difficulty with high-lift fire extinguishing for a long time by urban fire control and forest fire protection technology
Topic.Not yet there are the fire extinguishing equipment Design method for being applied to field long gap, high-tension transmission circuit mountain fire, existing common fire dress
The aspects such as standby range, insulating properties cannot meet the extinguishment requirement of transmission line forest fire.
The content of the invention
To solve the above problems, it is an object of the invention to provide a kind of powered high-lift fire extinguishing equipment of transmission line forest fire
Method for designing, makes fire extinguishing aqua no longer continuous by the potent atomization of the aqua that will put out a fire, and occurs the air gap between droplet and improves exhausted
Edge performance, solves the problem of live-wire fire fighting；Fire-fighting efficiency can be improved by adding high-efficiency fire-extinguishant, fire extinguishing aqua flow is reduced,
The outlet pressure of extinguishing device is improved, high-lift fire extinguishing is realized.
The invention provides a kind of powered high-lift fire extinguishing equipment Design method of transmission line forest fire, the method includes：
Step 1, obtains the phase voltage of each voltage class transmission line of electricity, takes its maximum phase voltage Umax；
Step 2, according to the long gap water mists breakdown test characteristic curve that long gap water mists breakdown tester is obtained
And maximum phase voltage Umax, water mists spray path L and fogdrop diameter d that selection fire extinguishing equipment satisfaction is required；
Step 3, field transmission line forest fire fire extinguishing demand volume Q, computing formula are calculated according to fire extinguishing aqua fire-fighting efficiency
For：
Q=η Qwater
In formula, η is the ratio between fire-fighting efficiency of fire extinguishing aqua and light water；Mstr,waterIt is according to national standard《GB
17835-2008 water-based extinguishing agents》The gross mass of light water is used when development standard A classes are tested；Mstr,extIt is according to national standard
《GB 17835-2008 water-based extinguishing agents》The gross mass of fire extinguishing aqua is used when development standard A classes are tested；QwaterIt is common forest
Fire fighting truck fire extinguishing flow；
Step 4, according to the water mists atomizer output characteristic curve of fire extinguishing equipment, selects atomizer parameter and shower nozzle
Input pressure PsprayScope；
Step 5, the roughness of density p, viscosity μ and water delivery water with inwall of test fire extinguishing aqua simultaneously calculates its internal diameter
Absolute roughness ρ, and according to viscosity μ, inwall relative roughness Δ, water delivery water band internal diameter dlWith field transmission line of electricity mountain
Fire fire extinguishing demand volume Q, calculate fire extinguishing aqua flowed in water delivery water band reynolds number Re, along stroke pressure loss coefficient λ, along journey
Loss of flood peak hsdAnd lose P along stroke pressureloss；
Step 6, is L when transmission line forest fire fire extinguishing is equipped in water delivery distanced, fire extinguishing height headloss be PzWhen, meter
Calculate the pump output pressure P of fire extinguishing equipmentpumperMinimum value, it is ensured that the input pressure P of fire extinguishing sprayersprayCan penetrate its atomization
Journey reaches L, fogdrop diameter and reaches d, realizes powered safe fire extinction, and computing formula is：
Ppumper≥Pspray+PZ+Ploss
Ploss=ρ ghsd
PZ=ρ gh
In formula, PpumperIt is the pump output pressure of fire extinguishing equipment；PsprayIt is the input pressure of fire extinguishing equipment fire extinguishing sprayer；
PzIt is the headloss of height of putting out a fire, h is the difference in height that the mountain fire scene of a fire can reach place with fire extinguishing equipment；PlossIt is fire extinguishing aqua
What is flowed in water delivery water band loses along stroke pressure；
Step 7, according to the pump output pressure P of fire extinguishing equipmentpumper, it is bent with reference to fire extinguishing equipment water-aspirator pressure output characteristics
Line, selects pump capacity and pressure.
As further improvement of the invention, in step 2, the characteristic acquisition methods of long gap water mists breakdown test
Including：
Step 201, builds water mists atomization insulation test device under long electrode gap, and the device includes power switch, jumps
Lock protection device, pressure regulator, transformer, protective resistance, high-pressure measurement mechanism, sleeve pipe grading ring, wire, fogdrop diameter measurement dress
Put, atomizer, hoistable platform and high-speed camera；
The power switch is connected with the input coil of the pressure regulator, and the input coil of the pressure regulator is provided with tripping operation
Protection device, the output winding of the pressure regulator is connected with the input coil of the transformer, the output winding of the transformer
The protective resistance is provided with, the output winding of the transformer is connected with the high-pressure measurement mechanism, meanwhile, the high pressure is surveyed
Amount device one end ground connection, the high-pressure measurement mechanism other end passes through the wire and the set with the protective resistance junction
Pipe grading ring bottom connects, and described sleeve pipe grading ring top is perforated through wall, and described sleeve pipe grading ring bottom part down is provided with the mist
Drop diameter measuring device, described hoistable platform one end is connected with described atomizer one end, the atomizer other end alignment
Described sleeve pipe grading ring bottom, the high-speed camera alignment described sleeve pipe grading ring, the fogdrop diameter measurement apparatus and institute
State atomizer；
Step 202,1 meter is adjusted to by the gap length L' between atomizer and sleeve pipe grading ring；
Step 203, starts the atomizer, adjusts the input pressure of the atomizer, makes the atomizer
Water mists spray path L is more than the gap length L' between the atomizer and described sleeve pipe grading ring；
Step 204, starts the fogdrop diameter measurement apparatus of water mists, and measurement atomizer is under the conditions of the input pressure
Fogdrop diameter；
Step 205, adjusts camera angle, and opening video camera is used to record the electric discharge road of water mists dielectric test
Footpath；
Step 206, connects the test loop power supply of the experimental rig, and the pressure regulator of experimental rig slowly at the uniform velocity boosts,
When the gap between bushing and the atomizer is breakdown, the power switch, record environment temperature now are disconnected
Degree T, water droplet diameter d and breakdown voltage U；
Step 207, repeat step 206 totally 5 times takes and obtains the average value of environment temperature, water droplet diameter for this 5 times
The average value of average value and breakdown voltage is simultaneously recorded, using the average value of breakdown voltage that records as this water droplet diameter bar
Breakdown voltage U under part；
Step 208, adjusts the input pressure of the atomizer, makes water droplet diameter progressively from 1400 μm with 200 μ
M is that integer arithmetic level is gradually decrease to 200 μm, and repeat step 206~207；
Step 209, closes the power switch, water droplet diameter measuring device, atomizer and high-speed camera；
Step 210, it is that integer arithmetic level increases to adjust the gap between the bushing and the atomizer with 1 meter
To L'max, and ensure that water mists breakdown voltage is more than Umax, repeat step 203~208；
Step 211, the data that measurement result is given are obtained according to above step, draw the breakdown voltage U and water mists
The change curve of the gap length L' between fogdrop diameter d, the atomizer and described sleeve pipe grading ring；
Step 212, after obtaining change curve, the water mists spray path L and droplet that selection fire extinguishing equipment meets requirement are straight
Footpath d.
Used as further improvement of the invention, the water mists spray path L of the atomizer is more than or equal to 15m, described
Water droplet diameter d scopes are 350 μm~550 μm.
Used as further improvement of the invention, enchashment has the flow Q of common forest fire fire extinguishing equipment in step 3waterFor
800~1200L/min.
Used as further improvement of the invention, the water mists atomizer output characteristic curve of equipment of being put out a fire in step 4 leads to
Cross and input pressure P is carried out to atomizerspray, flow Q, fogdrop diameter d experiment obtain.
Used as further improvement of the invention, the atomizer uses high speed circumference channel structure, and fire extinguishing aqua is in spiral shell
Axial direction, side velocity are obtained in rotation water channel, while also there is angular velocity of rotation, after lip jet in forward movement progressively
The broken atomization of rotation.
Used as further improvement of the invention, in step 5, what fire extinguishing aqua flowed in water delivery water band loses along stroke pressure
Calculation procedure include：
Step 501, calculates flow velocity v, and computing formula is：
Step 502, calculates the reynolds number Re that fire extinguishing aqua flows in water delivery water band, and computing formula is：
Re=ρ vd/ μ
Step 503, calculates extinguishing chemical and viscous sublayer thickness δ is flowed in water delivery water band, and computing formula is：
Step 504, according to flow regime of the viscous sublayer thickness inquiry fire extinguishing aqua in water delivery water band, corresponds to Buddhist nun respectively
The turbulent flow hydraulically smooth region of Gu Lazi curves, the transition region of hydraulically smooth to hydraulically rough, turbulent flow hydraulically rough region Gong Sange areas
Between, calculate loss factor λ：
Turbulent flow hydraulically smooth region computing formula is：
Hydraulically smooth is to the transition region computing formula of hydraulically rough：
Turbulent flow hydraulically rough region computing formula is：
Step 505, calculates frictional head loss h of the fire extinguishing aqua in water delivery water bandsd, computing formula is：
Step 506, calculates fire extinguishing aqua and loses P along stroke pressure in water delivery water bandloss, computing formula is：
Ploss=ρ ghsd。
Used as further improvement of the invention, in step 5, the fire extinguishing aqua conveys the internal diameter d of water bandlIt is 13mm-
20mm, bearing capacity reaches more than 15MPa.
Beneficial effects of the present invention are：
1st, with reference to water mists live-wire fire fighting mechanism, fire extinguishing aqua is fully atomized using fine mist spray head, improves fire extinguishing water
The insulating properties of agent, realize live-wire fire fighting；
2nd, fire-fighting efficiency is improved by adding extinguishing chemical, flow is reduced, so as to realize high-lift fire extinguishing；
3rd, suitable fogdrop diameter, range, pressure, lift and flow are chosen, fire extinguishing aqua is analyzed in water delivery water band
The pressure loss, calculating can be while powered under the conditions of meeting 1000kV extra high voltage lines live-wire fire fighting and 500 meters of lifts be gone out
Fire equipment output pressure scope, for the design of the high-lift fire extinguishing equipment of electric transmission line hot-line provides complete, feasible method.
Brief description of the drawings
Fig. 1 is the stream of a kind of powered high-lift fire extinguishing equipment Design method of transmission line forest fire described in the embodiment of the present invention
Journey schematic diagram；
Fig. 2 is the structural representation of the long gap water mists breakdown test described in the embodiment of the present invention；
Fig. 3 be the embodiment of the present invention described in long gap water mists breakdown test characteristic curve intermediate gap length be 10 meters when
Breakdown voltage schematic diagram.
Specific embodiment
The present invention is described in further detail below by specific embodiment and with reference to accompanying drawing.
As shown in figure 1, a kind of powered high-lift fire extinguishing equipment Design method of transmission line forest fire of the embodiment of the present invention, bag
Include：
Step 1, to the UHV transmission line in the range of 110kV-1000kV, wire is over the ground or to fire extinguishing personnel's electric discharge
For single-phase transmission line discharges, its maximum phase voltage UmaxIt is 578kV.
Step 2, according to the long gap water mists breakdown test characteristic curve that long gap water mists breakdown tester is obtained
And maximum phase voltage Umax, water mists spray path L and fogdrop diameter d that selection fire extinguishing equipment satisfaction is required.Specifically include：
Step 201, builds water mists atomization insulation test device under long electrode gap, and the device includes power switch, jumps
Lock protection device, pressure regulator, transformer, protective resistance, high-pressure measurement mechanism, sleeve pipe grading ring, wire, fogdrop diameter measurement dress
Put, atomizer, hoistable platform and high-speed camera；
Power switch is connected with the input coil of pressure regulator, and the input coil of pressure regulator is provided with trip protection device, adjusts
The output winding of depressor is connected with the input coil of transformer, and the output winding of transformer is provided with protective resistance, transformer
Output winding is connected with high-pressure measurement mechanism, meanwhile, high-pressure measurement mechanism one end ground connection, the high-pressure measurement mechanism other end with protection
Resistance joint is connected by wire with sleeve pipe grading ring bottom, and sleeve pipe grading ring top is perforated through wall, sleeve pipe grading ring bottom
Lower section is provided with fogdrop diameter measurement apparatus, and hoistable platform one end is connected with atomizer one end, atomizer other end alignment sleeve
Pipe grading ring bottom, high-speed camera alignment sleeve grading ring, fogdrop diameter measurement apparatus and atomizer.
Step 202,1 meter is adjusted to by the gap length L' between atomizer and sleeve pipe grading ring；
Step 203, starts atomizer, adjusts the input pressure of atomizer, is atomized the water mists of atomizer and penetrates
Journey L is more than the gap length L' between atomizer and sleeve pipe grading ring.
Step 204, starts the fogdrop diameter measurement apparatus of water mists, and measurement atomizer is under the conditions of the input pressure
Fogdrop diameter.
Step 205, adjusts camera angle, and opening video camera is used to record the electric discharge road of water mists dielectric test
Footpath.
Step 206, the test loop power supply of call through test device, the pressure regulator of experimental rig slowly at the uniform velocity boosts, and treats height
When gap between gland pipe and atomizer is breakdown, disconnecting power switch, record environment temperature T, water mists mist now
Drop diameter d and breakdown voltage U.
Step 207, repeat step 206 totally 5 times takes and obtains the average value of environment temperature, water droplet diameter for this 5 times
The average value of average value and breakdown voltage is simultaneously recorded, using the average value of breakdown voltage that records as this water droplet diameter bar
Breakdown voltage U under part.
Step 208, adjusts the input pressure of atomizer, makes the water droplet diameter be from 1400 μm with 200 μm progressively
Integer arithmetic level is gradually decrease to 200 μm, and repeat step 206~207.
Step 209, turns off the power switch, water droplet diameter measuring device, atomizer and high-speed camera.
Step 210, the gap between adjustment bushing and atomizer is that integer arithmetic level increases to L' with 1 metermaxFor
15 meters, and ensure that water mists breakdown voltage is more than Umax, repeat step 203~208.
Step 211, the data that measurement result is given are obtained according to above step, draw breakdown voltage U and water droplet
The change curve of the gap length L' between diameter d, atomizer and sleeve pipe grading ring.
Step 212, after obtaining change curve, to ensure the margin of safety of fire extinguishing personnel, the margin of safety for taking 1.38 times is made
It is breakdown voltage, that is, water mists meet insulating requirements when requiring that gap voltage is 578*1.38=800kV, selection fire extinguishing equipment is full
The water mists spray path L that foot is required is 500 μm for 15m and fogdrop diameter d.
Step 3, the S-6-A extinguishing chemicals developed using Hu'nan Xiangdian Trial Research Technology Co., Ltd., through extinguishing chemical fire extinguishing property
Energy contrast test obtains 10 times that its fire-fighting efficiency is water, and calculating field transmission line forest fire according to fire extinguishing aqua fire-fighting efficiency goes out
Fiery demand volume Q, computing formula is：
Q=η Qwater
Because field transmission line forest fire water source is deficient, realize that low discharge is put out a fire by improving fire-fighting efficiency, enchashment has general
The flow Q of logical forest fire fire extinguishing equipmentwaterIt is 800~1200L/min, the fire-fighting efficiency of aqua of being put out a fire after addition extinguishing chemical can
Improve to about 10 times, be calculated field transmission line forest fire fire extinguishing demand volume Q=80L/min.Fire extinguishing in the present embodiment
Equipment has two water delivery outlets, therefore the flow of one of water delivery outlet is 40L/min.
Step 4, according to the water mists atomizer output characteristic curve of fire extinguishing equipment, selects atomizer parameter and shower nozzle
Input pressure PsprayScope.
The present embodiment uses high speed circumference channel structure atomizer, and by putting out a fire, aqua obtains axle in spiral channel
To outside, side velocity, while also having angular velocity of rotation, can progressively be rotated in forward movement after lip jet broken
Atomization.In PsprayUnder=4.5MPa pressure conditions, range is 15.5m, and diameter droplet accounting in 480 μm of -520 μ m is
More than 90%.
Step 5, the roughness of density p, viscosity μ and water delivery water with inwall of test fire extinguishing aqua simultaneously calculates its internal diameter
Absolute roughness ρ, and according to viscosity μ, inwall relative roughness Δ, water delivery water band internal diameter dlWith field transmission line of electricity mountain
Fire fire extinguishing demand volume Q, calculate fire extinguishing aqua flowed in water delivery water band reynolds number Re, along stroke pressure loss coefficient λ, along journey
Loss of flood peak hsdAnd lose P along stroke pressureloss.Specifically include：
Step 501, calculates flow velocity v, and computing formula is：
Wherein, extinguishing chemical and the viscosity μ of the mixing fire extinguishing aqua of water are 1.005 × 10-3Pas, water delivery water band
Internal diameter dlIt is 18mm, its internal diameter absolute roughness ρ is 0.010mm, inwall relative roughness Δ is 0.000625.
It is 2.6m/s to be calculated the aqua flowing velocity v in 18mm diameter water delivery water bands that must put out a fire.
Step 502, calculates the reynolds number Re that fire extinguishing aqua flows in water delivery water band, and computing formula is：
Re=ρ vd/ μ=46969
Therefore fire extinguishing aqua is turbulence state in water delivery water band.
Step 503, calculates extinguishing chemical and viscous sublayer thickness δ is flowed in water delivery water band, and computing formula is：
Step 504, according to flow regime of the viscous sublayer thickness inquiry fire extinguishing aqua in water delivery water band, corresponds to Buddhist nun respectively
The turbulent flow hydraulically smooth region of Gu Lazi curves, the transition region of hydraulically smooth to hydraulically rough, turbulent flow hydraulically rough region Gong Sange areas
Between, calculate loss factor λ：
Turbulent flow hydraulically smooth region computing formula is：
Hydraulically smooth is to the transition region computing formula of hydraulically rough：
Turbulent flow hydraulically rough region computing formula is：
In the present embodiment, flowing of the fire extinguishing aqua in 3000 meters of water delivery water bands is in turbulent flow hydraulically smooth region, by Reynolds
Number is brought intoIt is iterated and is calculated loss factor λ=0.02.
Step 505, calculates frictional head loss h of the fire extinguishing aqua in 3000 meters of water delivery water bandssd, computing formula is：
Step 506, calculates fire extinguishing aqua and loses P along stroke pressure in water delivery water bandloss, computing formula is：
Ploss=ρ ghsd=103*9.8*403/106=4.03MPa.
Step 6, when transmission line forest fire fire extinguishing is equipped in water delivery apart from LdFor 3000 meters, fire extinguishing lift be 500 meters when, go out
The headloss P of fiery heightz=103*9.8*500/106=4.9MPa, put out a fire equipment fire extinguishing sprayer pressure input requirements be
Pspray>=4.5Mpa, then the pump output pressure P of fire extinguishing equipment when meeting 500 meters of lifts, 3000 meters of water delivery distancepumper≥4.5
+ 4.9+4.03=13.43Mpa, it is ensured that the input pressure P of fire extinguishing sprayersprayIts spray path can be made to reach 15m, fogdrop diameter
500 μm are reached, the live-wire fire fighting of 1000kV and following voltage class on 500 meters of lift high mountains is realized.
Step 7, according to the pump output pressure P of fire extinguishing equipmentpumper, it is bent with reference to fire extinguishing equipment water-aspirator pressure output characteristics
Line, selection pump capacity is 80L/min and pressure is more than 13.43Mpa, and fire extinguishing equipment high-pressure hydraulic pump model HAWK may be selected
HFR80。
The present invention carries out water mists breakdown test under different gap length, different fogdrop diameters, obtains water mists and punctures spy
Linearity curve, fogdrop diameter and spray path for needed for determination extinguishing device meets extra-high voltage and following voltage class live-wire fire fighting
Foundation is provided；Based on fire extinguishing aqua during high-lift water delivery along stroke pressure costing bio disturbance, design the outlet of extinguishing device
Pressure, satisfaction make extinguishing device all the time in high-efficient atomizing, can live-wire fire fighting state.The present invention provides a kind of spray path
Long, good insulation preformance, is applicable to the transmission line of electricity fire extinguishing equipment Design method of different scene of a fire height.
The preferred embodiments of the present invention are the foregoing is only, is not intended to limit the invention, for the skill of this area
For art personnel, the present invention can have various modifications and variations.It is all within the spirit and principles in the present invention, made any repair
Change, equivalent, improvement etc., should be included within the scope of the present invention.
Claims (8)
1. a kind of transmission line forest fire it is powered it is high-lift fire extinguishing equipment Design method, it is characterised in that the method includes：
Step 1, obtains the phase voltage of each voltage class transmission line of electricity, takes its maximum phase voltage Umax；
Step 2, according to the long gap water mists breakdown test characteristic curve and most that long gap water mists breakdown tester is obtained
Big phase voltage Umax, water mists spray path L and fogdrop diameter d that selection fire extinguishing equipment satisfaction is required；
Step 3, field transmission line forest fire fire extinguishing demand volume Q is calculated according to fire extinguishing aqua fire-fighting efficiency, and computing formula is：
Q=η Qwater
In formula, η is the ratio between fire-fighting efficiency of fire extinguishing aqua and light water；Mstr,waterIt is according to national standard《GB 17835-
2008 water-based extinguishing agents》The gross mass of light water is used when development standard A classes are tested；Mstr,extIt is according to national standard《GB
17835-2008 water-based extinguishing agents》The gross mass of fire extinguishing aqua is used when development standard A classes are tested；QwaterIt is common forest fire prevention and control
Car fire extinguishing flow；
Step 4, according to the water mists atomizer output characteristic curve of fire extinguishing equipment, selection atomizer parameter and shower nozzle are input into
Pressure PsprayScope；
Step 5, the roughness of density p, viscosity μ and water delivery water with inwall of test fire extinguishing aqua and to calculate its internal diameter absolute
Roughness ρ, and according to viscosity μ, inwall relative roughness Δ, water delivery water band internal diameter dlGone out with field transmission line forest fire
Fiery demand volume Q, calculate fire extinguishing aqua flowed in water delivery water band reynolds number Re, along stroke pressure loss coefficient λ, along Cheng Shuitou
Loss hsdAnd lose P along stroke pressureloss；
Step 6, is L when transmission line forest fire fire extinguishing is equipped in water delivery distanced, fire extinguishing height headloss be PzWhen, calculating is gone out
The pump output pressure P of fire equipmentpumperMinimum value, it is ensured that the input pressure P of fire extinguishing sprayersprayCan reach its spray path
D is reached to L, fogdrop diameter, powered safe fire extinction is realized, computing formula is：
Ppumper≥Pspray+PZ+Ploss
Ploss=ρ ghsd
PZ=ρ gh
In formula, PpumperIt is the pump output pressure of fire extinguishing equipment；PsprayIt is the input pressure of fire extinguishing equipment fire extinguishing sprayer；PzFor
The headloss of fire extinguishing height, h is the difference in height that the mountain fire scene of a fire can reach place with fire extinguishing equipment；PlossIt is to put out a fire aqua defeated
Flowing loses along stroke pressure in water water band；
Step 7, according to the pump output pressure P of fire extinguishing equipmentpumper, with reference to fire extinguishing equipment water-aspirator pressure output characteristic curve, choosing
Select pump capacity and pressure.
2. transmission line forest fire according to claim 1 it is powered it is high-lift fire extinguishing equipment Design method, it is characterised in that step
In rapid 2, the characteristic acquisition methods of long gap water mists breakdown test include：
Step 201, builds water mists atomization insulation test device under long electrode gap, and the device includes that power switch, tripping operation are protected
Protection unit, pressure regulator, transformer, protective resistance, high-pressure measurement mechanism, sleeve pipe grading ring, wire, fogdrop diameter measurement apparatus,
Atomizer, hoistable platform and high-speed camera；
The power switch is connected with the input coil of the pressure regulator, and the input coil of the pressure regulator is provided with trip protection
Device, the output winding of the pressure regulator is connected with the input coil of the transformer, is set on the output winding of the transformer
There is the protective resistance, the output winding of the transformer is connected with the high-pressure measurement mechanism, meanwhile, the high-tension measurement dress
One end ground connection is put, the high-pressure measurement mechanism other end is equal by the wire and described sleeve pipe with the protective resistance junction
Pressure ring bottom connects, and described sleeve pipe grading ring top is perforated through wall, and it is straight that described sleeve pipe grading ring bottom part down is provided with the droplet
Calipers, described hoistable platform one end is connected with described atomizer one end, and the atomizer other end alignment is described
Sleeve pipe grading ring bottom, the high-speed camera alignment described sleeve pipe grading ring, the fogdrop diameter measurement apparatus and the mist
Change shower nozzle；
Step 202,1 meter is adjusted to by the gap length L' between atomizer and sleeve pipe grading ring；
Step 203, starts the atomizer, adjusts the input pressure of the atomizer, makes the thin water of the atomizer
Mist spray path L is more than the gap length L' between the atomizer and described sleeve pipe grading ring；
Step 204, starts the fogdrop diameter measurement apparatus of water mists, droplet of the measurement atomizer under the conditions of the input pressure
Diameter；
Step 205, adjusts camera angle, and opening video camera is used to record the discharge path of water mists dielectric test；
Step 206, connects the test loop power supply of the experimental rig, and the pressure regulator of experimental rig slowly at the uniform velocity boosts, and treats height
When gap between gland pipe and the atomizer is breakdown, the power switch is disconnected, record environment temperature T now,
Water droplet diameter d and breakdown voltage U；
Step 207, repeat step 206 totally 5 times, take obtain for this 5 times the average value of environment temperature, water droplet diameter it is average
The average value of value and breakdown voltage is simultaneously recorded, using the average value of breakdown voltage that records as under the conditions of this water droplet diameter
Breakdown voltage U；
Step 208, adjusts the input pressure of the atomizer, makes the water droplet diameter be from 1400 μm with 200 μm progressively
Integer arithmetic level is gradually decrease to 200 μm, and repeat step 206~207；
Step 209, closes the power switch, water droplet diameter measuring device, atomizer and high-speed camera；
Step 210, it is that integer arithmetic level is increased to adjust the gap between the bushing and the atomizer with 1 meter
L'max, and ensure that water mists breakdown voltage is more than Umax, repeat step 203~208；
Step 211, the data that measurement result is given are obtained according to above step, draw the breakdown voltage U and water droplet
The change curve of the gap length L' between diameter d, the atomizer and described sleeve pipe grading ring；
Step 212, after obtaining change curve, selection fire extinguishing equipment meets desired water mists spray path L and is and fogdrop diameter
d。
3. transmission line forest fire according to claim 2 it is powered it is high-lift fire extinguishing equipment Design method, it is characterised in that institute
The water mists spray path L of atomizer is stated more than or equal to 15m, the water droplet diameter d scopes are 350 μm~550 μm.
4. transmission line forest fire according to claim 1 it is powered it is high-lift fire extinguishing equipment Design method, it is characterised in that step
Enchashment has the flow Q of common forest fire fire extinguishing equipment in rapid 3waterIt is 800~1200L/min.
5. transmission line forest fire according to claim 1 it is powered it is high-lift fire extinguishing equipment Design method, it is characterised in that step
The water mists atomizer output characteristic curve of equipment of being put out a fire in rapid 4 carries out input pressure P by atomizerspray, flow
Q, fogdrop diameter d experiment are obtained.
6. transmission line forest fire according to claim 1 it is powered it is high-lift fire extinguishing equipment Design method, it is characterised in that institute
Atomizer is stated using high speed circumference channel structure, fire extinguishing aqua obtains axial direction, side velocity in spiral channel, while also having
There is angular velocity of rotation, progressively rotate broken atomization after lip jet in forward movement.
7. transmission line forest fire according to claim 1 it is powered it is high-lift fire extinguishing equipment Design method, it is characterised in that step
In rapid 5, the calculation procedure lost along stroke pressure that fire extinguishing aqua flows in water delivery water band includes：
Step 501, calculates flow velocity v, and computing formula is：
Step 502, calculates the reynolds number Re that fire extinguishing aqua flows in water delivery water band, and computing formula is：
Re=ρ vd/ μ
Step 503, calculates extinguishing chemical and viscous sublayer thickness δ is flowed in water delivery water band, and computing formula is：
Step 504, according to flow regime of the viscous sublayer thickness inquiry fire extinguishing aqua in water delivery water band, corresponds to Ni Gula respectively
Hereby the turbulent flow hydraulically smooth region of curve, the transition region of hydraulically smooth to hydraulically rough, turbulent flow hydraulically rough region totally three intervals, meter
Calculate loss factor λ：
Turbulent flow hydraulically smooth region computing formula is：
Hydraulically smooth is to the transition region computing formula of hydraulically rough：
Turbulent flow hydraulically rough region computing formula is：
Step 505, calculates frictional head loss h of the fire extinguishing aqua in water delivery water bandsd, computing formula is：
Step 506, calculates fire extinguishing aqua and loses P along stroke pressure in water delivery water bandloss, computing formula is：
Ploss=ρ ghsd。
8. transmission line forest fire according to claim 1 it is powered it is high-lift fire extinguishing equipment Design method, it is characterised in that step
In rapid 5, the fire extinguishing aqua conveys the internal diameter d of water bandlIt is 13mm-20mm, bearing capacity reaches more than 15MPa.
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Effective date of registration: 20231129 Address after: 410131 building 4, 55 East Longhua Road, Changsha Economic and Technological Development Zone, Changsha City, Hunan Province Patentee after: Hunan Disaster Prevention Technology Co.,Ltd. Patentee after: XIANG-ELECTRIC EXPERIMENT AND RESEARCH TECHNOLOGY COMPANY OF HUNAN PROVINCE Address before: 410205, 2nd Floor, Rear Building, Software Center Building, No. 662 Lugu Avenue, High tech Development Zone, Changsha City, Hunan Province Patentee before: XIANG-ELECTRIC EXPERIMENT AND RESEARCH TECHNOLOGY COMPANY OF HUNAN PROVINCE |