CN106581916A - Dust explosion suppression device in confined space and trigger method of dust explosion suppression device - Google Patents
Dust explosion suppression device in confined space and trigger method of dust explosion suppression device Download PDFInfo
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- CN106581916A CN106581916A CN201611176796.1A CN201611176796A CN106581916A CN 106581916 A CN106581916 A CN 106581916A CN 201611176796 A CN201611176796 A CN 201611176796A CN 106581916 A CN106581916 A CN 106581916A
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- Prior art keywords
- suppression device
- explosion
- explosion suppression
- restricted clearance
- pressure
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Classifications
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- A—HUMAN NECESSITIES
- A62—LIFE-SAVING; FIRE-FIGHTING
- A62C—FIRE-FIGHTING
- A62C37/00—Control of fire-fighting equipment
- A62C37/08—Control of fire-fighting equipment comprising an outlet device containing a sensor, or itself being the sensor, i.e. self-contained sprinklers
- A62C37/10—Releasing means, e.g. electrically released
Abstract
The invention discloses a trigger method of a dust explosion suppression device in a confined space. The dust explosion suppression device comprises dynamic pressure sensors, an explosion suppression device, a detection and control unit and an alarm and display unit. The trigger method of the explosion suppression device is characterized in that when the average value of the pressure increments detected by the two pressure sensors reaches a set threshold value, the detection and control unit is in an early-warning state, pressure change signals are collected at the certain sampling frequency, the pressure rising speed (dP/dt) and the product K of the pressure rising speed (dP/dt) and the cube root of the volume (V) of the confined space are calculated according to the formula: K=(dP/dt)*V<1/3>, and the explosion suppression device is triggered when the average value reaches one quarter of the hazard index Kst of dust explosion in the confined space. The trigger method has the advantages that the trigger reliability of the explosion suppression device is improved, and the defect that the difference of explosion suppression effects in the confined spaces with different volumes is large is overcome.
Description
Technical field
The present invention relates to combustible dust/air mixture explosion suppression technical field in restricted clearance, more particularly to it is a kind of
The triggering method of dust explosion restraining device in restricted clearance.
Background technology
Industrial production operations specific place such as relatively closed factory building, apparatus casing, can be summarized as restricted clearance, when above-mentioned
When there is the combustible dust/air mixture hidden danger in explosion ratio scope in restricted clearance, easily send out under given conditions
Fecula dust explosion accident, the maximum explosion pressure of generation in 0.7-0.8MPa amplitudes, because the kind equipment, plant designing pressure lead to
Normal pressure is often only slightly higher than, thus blast phase destruction will be produced, while the outside its spread in china of explosive flame, causes of overall importance quick-fried
It is fried, bring great casualties and property loss.Dust explosion suppression technology in restricted clearance is as shown in figure 1, refer to detection
To after initial explosion signal, explosion suppression device is triggered, quickly sprays datonation-inhibition medium, prevented, weaken up to complete knock down the flame and propagate,
It is the preferential safeguard procedures selected in some application scenarios.
It is special in published China with regard to the technical information of combustible dust in restricted clearance/air mixture explosion suppression
In sharp document it has been reported that above-mentioned explosion suppression device by detection initial explosion pressure and（Or）The explosive characteristics such as explosive flame are believed
Number triggered, the means for triggering explosion suppression device produce the datonation-inhibition medium of gas-powered to light gas generator.
Although prior art respectively has corresponding technique effect, there is following logical disadvantage：First, certain for existing
The restricted clearance of concentration dust, such as using detection explosive flame（Spark）It is means Deng optical parameter, in actual application
Sensor photosensitive part has dust and gathers and causes to block, and the response time is serious delayed or even is unable to effective detection initial explosion；
Second, as adopted pressure increase Δ P indexs for trigger meanses, such as triggering pressure arranges relatively low, although the promptness of triggering is obtained
Ensure, but the pressure oscillation that normal production technology is allowed can also cause explosion suppression device false triggering, and such as triggering pressure arranges higher,
Then explode and fully develop, its inhibition is greatly reduced；Third, comparing compared with fire, combustible dust/air mixture blast
For strong premix deflagration, explosion suppression device is from triggering（Gas generator is powered）Spraying completely to datonation-inhibition medium must have one
The fixed time limit；Fourth, being also that most importantly, the restricted clearance of different volumes is occurring explosion time, its blast pressure -- when
Between change course then as shown in Fig. 2 bulky restricted clearance, although its pressure rises, process is slower, and its damage effect is then
It is higher, thus equal triggering pressure is such as set with the restricted clearance of small volume, its explosion suppression effect will be significantly reduced, therefore
And the current demand that the restricted clearance dust explosion that can not meet different volumes suppresses.
The technical problem of four aspects concluded above is substantially and lacks targetedly explosion suppression device triggering method.For
This, the applicant has made beneficial exploration and actual trial, and technical scheme described below is under this background
Produce.
The content of the invention
It is an object of the invention to provide in a kind of restricted clearance dust explosion restraining device triggering method, improve it is datonation-inhibition
The reliability of device triggering, overcomes the larger defect of explosion suppression effect difference in not isometric restricted clearance.Particular technique
Scheme is as follows：
Dust explosion restraining device in a kind of restricted clearance, including：First dynamic blast signal detection pressure sensor, second move
State detonator signal detection pressure sensor, detection and control unit, the detection and control unit, by shielded conductor and first
Dynamic blast signal detection pressure sensor, the connection of the second dynamic blast signal detection pressure sensor；The detection and control
Unit is also associated with the first explosion suppression device, the second explosion suppression device, and reports to the police and display unit.
Further, it is stored with the detection control unit by the dust explosion risk index Kst of protection restricted clearance
Data message.
The triggering method of dust explosion restraining device in a kind of described restricted clearance,
When the first dynamic blast signal detection pressure sensor, the second dynamic blast signal detection detect pressure increase Δ P1、
ΔP2Mean value when reaching 0.01MPa, detection control unit enters alert status, is hereafter gathered with certain sample frequency
Pressure change signal simultaneously calculates rate of pressure rise (dP/dt) and rate of pressure rise and restricted clearance volume（V）Cube
Product K=(dP/dt) V of root1/3, when the first dynamic blast signal detection is by pressure sensor, the second dynamic blast signal detection
The K that pressure sensor is detected and calculated1、K2Mean value reach dust explosion risk index Kst in restricted clearance four/
For the moment, detection and control unit trigger the first explosion suppression device, the second explosion suppression device simultaneously, at the same time, report to the police and display unit
Send audible and visible alarm and show that explosion suppression device is triggered.
Further, the described dynamic blast signal detection pressure sensor response time is less than 100 μ s.
Further, the sample frequency is more than 50kHz.
Further, first explosion suppression device（21）, the second explosion suppression device（22）It is interior to store the datonation-inhibition medium of ultra-fine dry powder,
Gas generator is installed in device, after explosion suppression device triggering, the nitrogen that gas generator is produced can within the 10ms times incite somebody to action
The pressure of explosion suppression device is promoted to 10MPa by normal pressure, drives datonation-inhibition medium injection.
Further, determine and lay explosion suppression device according to by the geometry of protection restricted clearance and volume, sprinkling
Explosion suppressant can be not less than 800g/m concentration is formed by protection restricted clearance3, the Explosion suppressant ceiling of relatively uniform distribution is presented.
Compared with prior art, the technical scheme that the present invention is provided has the advantages that：
1st, using two dynamic pressure transducer detection blast initial signals, reliability is improved.
2nd, touch by explosion suppression device of the product of the rate of pressure rise of starting stage of exploding and restricted clearance volume cubic root
Send out threshold value, overcome explosion suppression effect difference in the different restricted volume spaces produced by existing triggering method it is larger lack
Fall into.
Description of the drawings
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
The accompanying drawing to be used needed for having technology description is briefly described.
Fig. 1 is that occur in restricted clearance after dust explosion, detects explosive characteristic signal, triggering explosion suppression device, is reduced quick-fried
The schematic flow sheet of fried occurrence situation.
Fig. 2 is that under the conditions of entity apparatus simulated experiment, volume is 1m3And 20m3Restricted clearance dust occur dust explosion
When, blast pressure-time change course figure tests the dust physicochemical property and concentration all same for adopting, from security standpoint,
The intensity of container is 2 times of maximum explosion pressure, although maximum explosion pressure is quite, 1m3The growth of blast pressure in device
Process is significantly faster than that 20m3Device, maximum explosion pressure climbing speed（dP/dt）maxIt is nearly 3 times for the latter, but（dP/dt）max •
V1/3
For constant, for specific dust, the constant becomes dust explosion risk index（Kst）.
Fig. 3 is the schematic diagram of dust explosion restraining device in the restricted clearance of the present invention.
The implication of each reference is described as follows in accompanying drawing：
A-quick-fried by the restricted clearance of datonation-inhibition protection, the 11-the first dynamic blast signal detection pressure sensor, the 12-the second dynamic
Fried signal detection pressure sensor, the 21-the first explosion suppression device, 22 second explosion suppression devices, 3-detection and control unit, 4-report
Alert and display unit.
Fig. 4 is restricted clearance dust winding plant and igniter.
The implication of each reference is described as follows in accompanying drawing：
5-dust winding plant, 6-igniter.
Fig. 5 is the cubic root product for adopting blast pressure climbing speed and restricted clearance volume for triggering mode different volumes
Restricted clearance in pressure schematic diagram, the threshold value for setting is the dust explosion risk index（Kst）A quarter, not consubstantiality
Maximum pressure peak value in long-pending restricted clearance after explosion suppression（Pred）In 0.038-0.04MPa is interval, effectiveness of explosion suppression phase
When.
Fig. 6 is the pressure schematic diagram under the datonation-inhibition triggering mode for adopting pressure increment in the restricted clearance of different volumes, is touched
Send out pressure threshold Δ P and be set as 0.012MPa, 2m3And 5m3Maximum pressure peak value in restricted clearance after explosion suppression（Pred）, its
In in 2m3The nearly 0.04MPa of pressure peak in restricted clearance, and in 5m3Pressure peak in restricted clearance can reach 0.07MPa,
Effectiveness of explosion suppression is not as good as 2m3Restricted clearance.
Specific embodiment
In order that patent examination personnel and the public can be more clearly understood from the technical spirit and beneficial effect of the present invention,
Applicant carries out clear, complete description by with reference to the accompanying drawing in the embodiment of the present invention to technical solution of the present invention.But to reality
The description for applying example is not the restriction to the present invention program, and one of ordinary skill in the art is not before creative work is made
Obtained other embodiment is put, the scope of protection of the invention is belonged to.
As the embodiment of the triggering method of dust explosion restraining device in the restricted clearance of the present invention, it is respectively in volume
2m3And 5m3Explosion experimental facility in carried out compliance test result.
Restricted clearance（Explosive container）And explosion suppression device
Referring to accompanying drawing 3 volume please be sets forth for 2m3And 5m3Cylindrical tube explosion test of the right side with movable end cover dress
Put, its draw ratio is 1:1, dust winding plant 5 as shown in Figure 4 and igniter 6 are laid with inside device.
Explosive container A tops arrange the screwed hole of two M10 1, and the first dynamic blast signal detection pressure biography is installed successively
Sensor 11, the second dynamic blast signal detection pressure sensor 12；Explosive container A tops, left end cap central part arrange two
The screwed hole of M108 3, is respectively mounted the first explosion suppression device 21, the second explosion suppression device 22；Detection and control unit 3 are adopted
STC12C5201AD single-chip microcomputers, carry 8 A/D conversions of two-way, and conversion speed is 300kHz/s；Report to the police and display unit 4 is adopted
CH240128B series dot matrix drawing type LCD MODULEs.
Two described dynamic blast signal detection pressure sensors 11,12 are by shielding line and detection and control unit 3
Connection, the detection and control unit 3 connect with the first above-mentioned explosion suppression device 21 and the second explosion suppression device 22, warning and display unit
Connect；Gas generator is installed in described the first explosion suppression device 21, the second explosion suppression device 22, and it is datonation-inhibition to store ultra-fine dry powder
Medium.
In the present embodiment, dynamic blast signal detection pressure sensor preferentially adopts quartz pressure sensor, rings
It is 50 μ s between seasonable；Datonation-inhibition medium preferentially adopts ultra-fine NaHCO3Powder, median is 32 μm, and Explosion suppressant concentration prior determines
For 800g/m3.In the present embodiment, the dust lighted preferentially adopts the cornstarch of 115 μm of median, in restricted clearance
The concentration prior of cornstarch adopts 650g/m3, igniter preferentially adopts energy for the chemical igniting head of 10kJ.
For ease of to detonator signal detection and explosion suppression device triggering control, in the present embodiment, detection and control unit 3 with
PC is connected, and by PC triggering command is performed, this change and the explosion suppression device apply at the scene in by detection and control unit
Independent acquisition, triggering not contradiction.
Blast and datonation-inhibition step
According to desired dust concentration, by a certain amount of cornstarch as in winding plant, match board head is laid, close destructor
Right end cap is simultaneously fastened end cap flange with 12 bolts of M16 45, is sealed with the silicone rubber pad of thickness 5mm between flange face.Peace
Fill the first dynamic blast signal detection pressure sensor 11, the second dynamic blast signal detection pressure sensor 12, assembling first
Explosion suppression device 21, the second explosion suppression device 22, are connected it with detection and control unit 3, warning and display unit 4 with shielding line.
By apply pressure for 0.8MPa compressed air by the cornstarch in dust winding plant 5 all kick up and
Relatively uniform distribution is presented in restricted clearance；Computer sends firing command, and igniter 6 ignites corn shallow lake in restricted clearance
Powder/air mixture, when the first dynamic blast signal detection pressure sensor 11, the second dynamic blast signal detection 12 are detected
Pressure increase Δ P1、ΔP2Mean value when reaching 0.01MPa, detection control unit enters alert status, hereafter with certain
Sample frequency gathers pressure change signal and calculates rate of pressure rise (dP/dt) and rate of pressure rise and restricted clearance
Volume（V）Cubic root product K=(dP/dt) V1/3, when the first dynamic blast signal detection pressure sensor 11, second is moved
The K that state detonator signal detection pressure sensor 12 is detected and calculated1、K2Mean value reach in restricted clearance dust explosion danger
During a quarter of dangerous index Kst, detection and control unit 3 trigger the first explosion suppression device 21, the second explosion suppression device 22, suppression simultaneously
Gas generator abrupt release nitrogen in quick-fried device so that the first explosion suppression device 21, the chamber pressure of the second explosion suppression device 22 exist
It is promoted to 10MPa in the time of 10ms rapidly, drives the sprinkling completely of the datonation-inhibition medium of ultra-fine dry powder of storage.At the same time, report
Alert and display unit 4 sends audible and visible alarm and shows that explosion suppression device is triggered.
Present invention applicant has carried out nearly 150 times and has simulated datonation-inhibition experiment according to above-described embodiment, to check the skill of the present invention
Art feasibility, accompanying drawing 5 is model experiment result, it can be seen that when using blast pressure climbing speed and restricted clearance
The cubic root product of volume is triggering mode, and the threshold value for setting is the dust explosion risk index（Kst）A quarter, it is different
Maximum pressure peak value in the restricted clearance of volume after explosion suppression（Pred）In 0.038-0.04MPa is interval.
As the contrast of the present invention, with blast pressure increment as explosion suppression device triggering side in applicant's foundation prior art
Formula, has also carried out a certain amount of application experiment, and set triggering pressure threshold Δ P is set as 0.01MPa, typical datonation-inhibition experiment
As a result it is as shown in Figure 6.As seen from the figure, in 2m3Maximum pressure peak value in restricted clearance after explosion suppression（Pred）Nearly 0.04MPa,
And in 5m3Maximum pressure peak value in restricted clearance after explosion suppression（Pred）0.07MPa is can reach, effectiveness of explosion suppression is substantially too late
2m3Restricted clearance.
In sum, the triggering method of dust explosion restraining device has in the restricted clearance that the embodiment of the present invention is provided
Following beneficial effect：
1st, using two dynamic pressure transducer detection blast initial signals, reliability is improved.
2nd, touch by explosion suppression device of the product of the rate of pressure rise of starting stage of exploding and restricted clearance volume cubic root
Send out threshold value, overcome explosion suppression effect difference in the different restricted volume spaces produced by existing triggering method it is larger lack
Fall into.
The above is the preferred embodiment of the present invention, it is noted that for those skilled in the art
For, under the premise without departing from the principles of the invention, some improvements and modifications can also be made, these improvements and modifications are also treated as
For the scope of protection of the invention.
Claims (7)
1. dust explosion restraining device in a kind of restricted clearance, including：First dynamic blast signal detection pressure sensor（11）、
Second dynamic blast signal detection pressure sensor（12）, detection and control unit（3）, it is characterised in that：The detection and control
Unit processed（3）, by shielded conductor and the first dynamic blast signal detection pressure sensor（11）, the second dynamic blast signal inspection
Pressure measurement force snesor（12）Connection；The detection and control unit（3）It is also associated with the first explosion suppression device（21）, the second datonation-inhibition dress
Put（22）, and report to the police and display unit（4）.
2. dust explosion restraining device in a kind of restricted clearance as claimed in claim 1, it is characterised in that：
The detection control unit（3）In be stored with by the dust explosion risk index Kst data messages of protection restricted clearance.
3. in a kind of restricted clearance as claimed in claim 1 dust explosion restraining device triggering method, it is characterised in that：When
First dynamic blast signal detection pressure sensor（11）, the second dynamic blast signal detection（12）Detect pressure increase Δ
P1、ΔP2Mean value when reaching 0.01MPa, detection control unit enters alert status, is hereafter adopted with certain sample frequency
Collection pressure change signal simultaneously calculates rate of pressure rise (dP/dt) and rate of pressure rise and restricted clearance volume（V）It is vertical
Product K=(dP/dt) V of root1/3, when the first dynamic blast signal detection is by pressure sensor（11）, the second dynamic blast letter
Number detection pressure sensor（12）The K for detecting and calculating1、K2Mean value reach dust explosion risk index in restricted clearance
During a quarter of Kst, detect and control unit（3）The first explosion suppression device is triggered simultaneously（21）, the second explosion suppression device（22）, with
This reports to the police and display unit simultaneously（4）Send audible and visible alarm and show that explosion suppression device is triggered.
4. in restricted clearance as claimed in claim 3 dust explosion restraining device triggering method, it is characterised in that：Described
The dynamic blast signal detection pressure sensor response time is less than 100 μ s.
5. in restricted clearance as claimed in claim 3 dust explosion restraining device triggering method, it is characterised in that：It is described to adopt
Sample frequency is more than 50kHz.
6. in restricted clearance as claimed in claim 3 dust explosion restraining device triggering method, it is characterised in that：Described
One explosion suppression device（21）, the second explosion suppression device（22）It is interior to store the datonation-inhibition medium of ultra-fine dry powder, gas generator is installed in device,
After explosion suppression device triggering, the nitrogen that gas generator is produced can be lifted the pressure of explosion suppression device by normal pressure within the 10ms times
To 10MPa, datonation-inhibition medium injection is driven.
7. in restricted clearance as claimed in claim 6 dust explosion restraining device triggering method, it is characterised in that：According to quilt
The geometry and volume of protection restricted clearance determines and lays explosion suppression device, and the Explosion suppressant of sprinkling can be by the limited sky of protection
Between formed concentration be not less than 800g/m3, the Explosion suppressant ceiling of relatively uniform distribution is presented.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611176796.1A CN106581916A (en) | 2016-12-19 | 2016-12-19 | Dust explosion suppression device in confined space and trigger method of dust explosion suppression device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611176796.1A CN106581916A (en) | 2016-12-19 | 2016-12-19 | Dust explosion suppression device in confined space and trigger method of dust explosion suppression device |
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| CN106581916A true CN106581916A (en) | 2017-04-26 |
Family
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| Application Number | Title | Priority Date | Filing Date |
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| CN201611176796.1A Pending CN106581916A (en) | 2016-12-19 | 2016-12-19 | Dust explosion suppression device in confined space and trigger method of dust explosion suppression device |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110006036A (en) * | 2018-06-05 | 2019-07-12 | 贾永康 | The well-mixed dust explosion boiler of chemically correct fuel is pressed under low-temp low-pressure |
| CN111494837A (en) * | 2020-04-29 | 2020-08-07 | 大连理工度达安全工程有限公司 | Dust explosion suppression system |
| WO2022204458A1 (en) * | 2021-03-25 | 2022-09-29 | Fike Corporation | System and method for detecting and suppressing dust explosions |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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Application publication date: 20170426 |