CN103328769B - For source of the gas being connected to system and the equipment of thermal oxidizer - Google Patents
For source of the gas being connected to system and the equipment of thermal oxidizer Download PDFInfo
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- CN103328769B CN103328769B CN201180065798.2A CN201180065798A CN103328769B CN 103328769 B CN103328769 B CN 103328769B CN 201180065798 A CN201180065798 A CN 201180065798A CN 103328769 B CN103328769 B CN 103328769B
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- conduit
- thermal oxidizer
- gas
- air
- air vent
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- 239000007800 oxidant agent Substances 0.000 title claims abstract description 69
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 100
- 238000010790 dilution Methods 0.000 claims description 31
- 239000012895 dilution Substances 0.000 claims description 31
- 238000009423 ventilation Methods 0.000 claims description 24
- 239000003245 coal Substances 0.000 claims description 8
- 238000005259 measurement Methods 0.000 claims description 5
- 230000008676 import Effects 0.000 claims description 3
- 239000007789 gas Substances 0.000 description 21
- 238000013461 design Methods 0.000 description 8
- 230000000694 effects Effects 0.000 description 6
- 230000001960 triggered effect Effects 0.000 description 6
- 230000008859 change Effects 0.000 description 4
- 238000002485 combustion reaction Methods 0.000 description 4
- 238000005474 detonation Methods 0.000 description 4
- 239000002360 explosive Substances 0.000 description 4
- 230000007246 mechanism Effects 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 230000004044 response Effects 0.000 description 4
- 238000007865 diluting Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000009499 grossing Methods 0.000 description 3
- 238000002955 isolation Methods 0.000 description 3
- 238000005096 rolling process Methods 0.000 description 3
- 230000032258 transport Effects 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 101100397006 Drosophila melanogaster Ilp3 gene Proteins 0.000 description 2
- 101100397021 Drosophila melanogaster Ilp6 gene Proteins 0.000 description 2
- 230000009471 action Effects 0.000 description 2
- 239000011449 brick Substances 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 239000005431 greenhouse gas Substances 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 239000000779 smoke Substances 0.000 description 2
- 101150032367 BIRC8 gene Proteins 0.000 description 1
- 102100027517 Baculoviral IAP repeat-containing protein 8 Human genes 0.000 description 1
- 101100452644 Drosophila melanogaster Ilp2 gene Proteins 0.000 description 1
- 101100397013 Drosophila melanogaster Ilp4 gene Proteins 0.000 description 1
- 101100397016 Drosophila melanogaster Ilp5 gene Proteins 0.000 description 1
- 101150079294 Ilp1 gene Proteins 0.000 description 1
- 235000005121 Sorbus torminalis Nutrition 0.000 description 1
- 244000152100 Sorbus torminalis Species 0.000 description 1
- 238000004887 air purification Methods 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 230000002706 hydrostatic effect Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000003389 potentiating effect Effects 0.000 description 1
- 238000004886 process control Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000010926 purge Methods 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 238000004078 waterproofing Methods 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F1/00—Ventilation of mines or tunnels; Distribution of ventilating currents
- E21F1/04—Air ducts
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F1/00—Ventilation of mines or tunnels; Distribution of ventilating currents
- E21F1/08—Ventilation arrangements in connection with air ducts, e.g. arrangements for mounting ventilators
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F1/00—Ventilation of mines or tunnels; Distribution of ventilating currents
- E21F1/10—Air doors
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F7/00—Methods or devices for drawing- off gases with or without subsequent use of the gas for any purpose
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G7/00—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals
- F23G7/06—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals of waste gases or noxious gases, e.g. exhaust gases
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/70—Organic compounds not provided for in groups B01D2257/00 - B01D2257/602
- B01D2257/702—Hydrocarbons
- B01D2257/7022—Aliphatic hydrocarbons
- B01D2257/7025—Methane
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/86—Catalytic processes
- B01D53/8668—Removing organic compounds not provided for in B01D53/8603 - B01D53/8665
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02C—CAPTURE, STORAGE, SEQUESTRATION OR DISPOSAL OF GREENHOUSE GASES [GHG]
- Y02C20/00—Capture or disposal of greenhouse gases
- Y02C20/20—Capture or disposal of greenhouse gases of methane
Landscapes
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Filling Or Discharging Of Gas Storage Vessels (AREA)
- Ventilation (AREA)
- Catching Or Destruction (AREA)
- Farming Of Fish And Shellfish (AREA)
- Sampling And Sample Adjustment (AREA)
- Incineration Of Waste (AREA)
Abstract
The invention discloses a kind of conduit source of the gas comprising VOC being connected to thermal oxidizer, wherein, conduit has enough large cross-sectional diameter gas velocity is reduced to below 7m/s before entering thermal oxidizer.
Description
Technical field
The present invention relates to a kind of method for the colliery that extremely worked by the secure connection such as thermal oxidizer, gas engine or boiler and/or equipment.Whereby, the methane from the vent air in colliery can be converted into carbon dioxide safely, therefore, under the prerequisite not affecting coal miner safety, significantly reduces greenhouse gas emission.
Background technology
A part as vent air is also referred to as ventilation air methane (VAM) from the d/d methane of underground coal mine.The amount of mine ventilation air is usually very large.Vent air exhaust stream is usually in the scope of 80m3/s to 500m3/s.
The methane content of VAM is no more than 1% of its volume usually.But per day VAM amount can change between 0.0% to 1.5% of its volume within any one month.Therefore, the combustion characteristics of VAM is very changeable.The flammable range of the methane in VAM is usually less than LFL (amount of Methane in Air accounts for 5.0%).
When there is underground events, methane concentration may soar to suddenly between 8% to 15% under special circumstances.More frequently, methane concentration may soar between 2 to 8%, but still is in very low frequency.Such as, seismic activity causes being adsorbed on methane release in goaf in the past, as the stopper of methane.May have no time to make warning, and the concentration of methane release can not be predicted.In order to safety, when these accidents occur, coal miner rely on do not have burning things which may cause a fire disaster safe as far as possible to guarantee their working environment.
Because methane is a kind of potent greenhouse gases, advise being burnouted VAM by some thermal oxidizer processes, in this, as greenhouse emission-reduction technology (such as, VAM RAB
tM, Voxidiser
tMand Vamox
tM).VAM can also as the combustion air of gas engine, gas turbine, boiler and other similar devices.But these thermal oxidizers and other VAM combustion systems but represent potential Ignition sources.Therefore, if use these greenhouse emission-reduction technologies, then needing within the several seconds can safely and constantly by system that thermal oxidizer and colliery are isolated.If such system energy easily extensible ground process 80 to 600m
3air capacity between/s is then desirable.
The speed that security system requires and large discharge mean large conduit isolation facility and shunting door.In order to move freely, these Men Buying are firmly fixed, reliably can move on to its correct position in emergency.
The risk do not slowed down must be brought down below Tolerable risk by this security system.For large-scale mine, All Countries all requires to be less than l × 10 every year
-6secondary fault, some country even requires to be less than l × 10
-9secondary fault.If the risk do not slowed down exceedes Tolerable risk, then need independently topping.
Tolerable risk is reached by adopting independently topping (IPL).These toppings must be:
Independent operating
Abundant independence, to such an extent as to certain IPL fault can not cause negative effect to the probability of failure of another IPL.
Be designed to prevent hazard event, or alleviate event consequence.
Be designed to play its security function during normal, exception and design basis condition.
Performance can be audited
Topping can be total system or subsystem.Unless can not run, otherwise total system can thoroughly prevent cause from leading to consequence.Such as, even if when it normally runs, subsystem may not prevent cause from leading to consequence completely, only gives the alarm.Topping also can play and prevents or alleviate effect.
Can buy and obtain as existing business security product fire screen and smoke vent opening.When being out of order, fire screen can be closed automatically, and the smoke vent opening that spring is housed can be opened automatically.Can use these products that security system is connected to mine fan simultaneously.In topping, use these products simultaneously, allow the substitute market product of this specific occasion to develop.
Summary of the invention
According to an aspect of the present invention, a kind of conduit source of the gas comprising VOC being connected to thermal oxidizer is provided.Wherein, this conduit has enough large cross-sectional diameter the speed of this gas before entering thermal oxidizer is reduced to 7 below m/s.
In a kind of form of source of the gas, comprise methane and from coal mine ventilation system, it is introduced into duct inlet away from thermal oxidizer by blower fan, or it is drawn into thermal oxidizer import by the induced draft fan being positioned at thermal oxidizer outlet by conduit.
In a form of conduit, comprise baffle plate, along some place of the length of conduit between its entrance at conduit and thermal oxidizer, baffle plate can move between the open and the closed positions, time in an open position, gas can pass through along conduit between blower fan and thermal oxidizer, and time in the close position, stops gas to cross baffle plate along the length of conduit and leads to thermal oxidizer.
In a form of conduit, also comprise air vent, it is along some place of the length of conduit between duct entry and baffle plate, and wherein, this air vent can move between open mode and closure state.
In a form of conduit, also comprising dilution door, for being introduced in gas through conduit by the air of conduit outside, thus diluting the concentration of VOC in this gas.In a form of dilution door, also in conduit internal gas pressure reaches the event of predeterminated level or other events trigger, can use as air vent.
In a form of conduit, also comprise one or more safe ventilation hole, these air vents remain on make position until air pressure in conduit is just opened after reaching predeterminated level, or in another event trigger, now safe ventilation hole moves to open position, allows the gas in conduit to drain into air.
In a form in described one or more safe ventilation hole, one or more safe ventilation hole is formed with the form of easy clutch (frangible), and wherein, when the pressure in conduit reaches predeterminated level, air vent moves to open position.
In a form, predeterminated level is 250 handkerchiefs (Pa) (measurement unit).In optional form, air vent is opened in another trigger event (such as ventilate and be down to-100 handkerchiefs (measurement unit)).
In conduit form, also comprise isolating valve, it is positioned at and is close to before thermal oxidizer, and when isolating valve closes, thermal oxidizer and conduit and source of the gas can be isolated by it.
Accompanying drawing explanation
Preferred by below in conjunction with accompanying drawing, but not there is the detailed description of restrictive embodiment, the present invention may be better understood:
Fig. 1 is according to underground mine in an embodiment and transports the elevation cross-sectional view of VAM to the conduit of thermal oxidizer;
Fig. 2 is infrared rays methane monitor response curve;
Fig. 3 is layer of protection analysis figure;
Fig. 4 is according to underground mine in another embodiment and transports the elevation cross-sectional view of VAM to the conduit of thermal oxidizer; And
Fig. 5 and Fig. 6 is all two the 6m × 6m leading to VAM distribution system, and that grows 36 meters of conduits waits axle figure.
Detailed description of the invention
Only describe some embodiments of the present invention above, can modify to it without departing from the scope and spirit in the present invention and/or change, these embodiments be descriptive and nonrestrictive.
In the context of the present specification, word " comprise " be meant to " mainly comprise but may not only comprise " or " having " or " comprising " instead of " only by ... composition ".The variant that word " comprises ", such as " comprises (comprise) " and has " comprising (comprising) " meaning of respective change.
Term used herein ' door ', ' air vent ', ' baffle plate ', ' valve ', ' curtain (curtain) ' or ' shutter (louver) ' are convertibly for representing by opening and closing thus allowing and limit the device of air current flow.
These words also do not mean that restrictive interpretation or represent other devices got rid of and perform identical function.
Door is used to represent the large valve of regular opening and closing
Air vent is in the large valve of open mode under being used to represent safest situation
Baffle plate is used to represent the large valve being in closure state in safest situation
As used herein, term " event triggering " is regarded as comprising following any one:
Underground height methane concentration, such as, more than 1.5%;
Underground low oxygen concentration, such as, lower than 20.6%;
The compression wave that underground is unexpected, such as 100 handkerchief magnitudes;
The high temperature of thermal oxidizer inside, such as more than 1050 DEG C; And/or,
The air-flow (high pressure) of thermal oxidizer entrance reduces, such as, exceed-100 handkerchiefs.
The different example that these events trigger also does not mean that restrictive interpretation or represents other events or equipment of getting rid of and performing identical function.According to each embodiment of the present invention, many independently events should be used to trigger and to activate these independently toppings.Trigger replacement event triggering by another event do not limit intention or explain or represent eliminating, because one or more " event triggering " can cause one or more IPL.
The present invention uses large conduit to transport VAM between mine ventilator and thermal oxidizer.Use large instead of little conduit, be because:
1. large conduit has larger cross-sectional area and provides slower gas velocity, therefore can guarantee there is the more time at a glob of (a slug of) methane before entering thermal oxidizer.These extra time allows air vent, baffle plate and door to move to their desired positions separately, simultaneously for the gas monitor processing time.
2. large conduit allows in conduit, install large air vent area, and reduces the speed of gas through air vent.Less conduit can be cost-saving, but consequence is, adds the pressure drop of the air vent through any installation, and this can increase electrostatic risk, and the particle carried secretly can damage the open and close mechanism of air vent.The more important thing is, little air vent does not allow quick drain, and causes dangerous buildup of pressure.
3. large conduit allows the sealing area that is centered around on each leakage area of air vent and baffle edge larger.Such as, the space of 15mm is may clearly in the conduit of 1m at diameter, but is just not obvious in the conduit of 5m at diameter.
In certain embodiments, ideally, before thermal oxidizer, conduit has large cross sectional area, so that the speed of gas is reduced to below 7m/s, is preferably lower than 3m/s but higher than 2m/s, thus as the obscission zone of mud.VAM speed is more than 2m/s, and therefore under atmospheric pressure it is more faster than the flame speed of methane.
In certain embodiments, before the baffle plate leading to thermal oxidizer, conduit comprises the air vent that spring is housed, and is discharged to air for making methane.Air vent is generally shutter form, and baffle plate is the form of rolling door or rolling curtain system.Other quick acting doors are also suitable, such as large blind system.These devices can limit or open the air-flow in large conduit rapidly.Independent of selected hardware, the combination of air vent and baffle plate by comprise enrich methane VAM bypass to air, and stop it to flow to thermal oxidizer and/or other VAM combustion systems by conduit.
Even if be in the conduit of 8m × 8m at cross section, blinds apparatus may only need mobile 300mm to open or close baffle plate.Rolling curtain has the advantage of vertical baffle, because the air-flow of itself and VAM is separated, completely so can not by sludge-polluted.
In the event that power-off or high methane event occur, ideally, the air vent in conduit was opened in half second, and baffle plate was closed in about 5 to 7 seconds.Air vent is usually located at the top board of conduit, because methane floats and discharged voluntarily by the air vent of top board.Usually there is multiple air vent and multiple baffle system in a conduit to increase independent protection layer (IPL).Tolerable risk is lower, then more likely indicate unnecessary air vent and baffle plate.In a preferred form, the air vent gross area in conduit is equal to or greater than the gross area of the baffle plate of conduit, and the gross area of baffle plate is equal to or greater than the maximum cross-section area of draft fan outlet.Air vent also can be used as air vent area for alleviating the pressure that in few conduit occurred, detonation produces.
It is very common for utilizing multiple blower fan VAM to be discharged mine.Therefore, air vent baffle system needs to be applied to each blower fan conduit or after each blower fan uniting conduit.For the ease of maintenance, every Fans has an air deflector system ideally.Or in order to reduce costs, a ventilation fan as bypass blower fan, and can replace the effect of one or more Mine Ventilators at the induced draft fan that the outlet of thermal oxidizer is arranged afterwards.In this arrangement, only conduit needs to have gravity vent and baffle system.
In order to make the waterproofing course on conduit assembly effective, ventilation opening should be positioned on the top board of the inclination of conduit.On the side that ventilation opening can be positioned at top board hip both sides or hip or shed roof (skillion foof).In an alternate embodiment of the invention, air vent also can be placed on catheter wall.
Gravity vent and baffle plate must fast reaction to avoid incrustation.Equally, ideally, ventilation opening and baffle plate do not have tightness thoroughly.The size of induced draft fan is required suitable, to introduce air in a small amount from air vent.In this type of design, still methane can be discharged even if in case of emergency fail to open.Baffle plate may be revealed a little, but residual methane can be discharged in next air vent/baffle arrangement, or is diluted to safe concentration by the dilution door further along conduit.
The dilution door arranged along catheter length also can be shutter or any other quick acting door.The area of dilution door is preferably greater than the cross-sectional area of conduit.In a preferred form, multiple dilution door is positioned in the length of conduit, therefore has 100% redundancy (redundancy) for this step.Same preferred, in power failure or high methane event, dilution door is opened automatically.
Dilution door also can be used as process control mechanism, reduces thermal oxidizer temperature by reducing the fuel concentration being incorporated into the VAM of thermal oxidizer.In addition, dilute door and also can be used as vent area to alleviate the pressure that in few conduit occurred, detonation produces.
Compared with the pressure caused with induced draft fan reduces, Mine Ventilator pressure (speed and hydrostatic head) only must account for the smaller portions that total system pressure reduces.Such permission dilution door-inhale enters fresh air more more than the air-flow of mine, and therefore means and methane concentration can be diluted to less than 5% from 10%.
Conduit also may be provided with multiple fixing air vent, once reach predetermined pressure, if every other air vent, baffle plate and dilution door are failed by design and operation, these air vents can be opened by automatic emergency.Ideally, some in these fixing air vents or safe ventilation hole are formed with the form of " easy clutch " and along conduit equably spaced apart, therefore its gross area exceedes the gross area diluting door.If methane concentration reaches 1.5%, when pressure is more than 250 handkerchief, the air vent of these easy clutches can be triggered in the inner somewhere of safety catheter.Ideally, the fixing air vent of easy clutch can be opened in 10 milliseconds.Ideally, use the combination of the panel (panel) of easy clutch in certain embodiments, these panels are triggered by the superpressure running counter to mechanical bias (such as spring or gas formula shock strut), combine with the panel triggered by pressure measxurement, the risk of common cause failure (common causefailure) can be reduced.
In addition, conduit also comprises reversing valve, and when detecting that methane concentration rises violently, thermal oxidizer is isolated by it.Automatically can close to isolate thermal oxidizer in the length along conduit closest to thermal oxidizer place when reversing valve is out of order.The speed of service of this isolating valve is slower than other baffle plates, air vent and door, is full of air to allow conduit and thermal oxidizer at one (plug of) methane before entering conduit.
Referring now to Fig. 1, VAM is drawn to surface from coal face 3 by ventilating shaft 2 by mine fan 1.A series of gas monitor runs in ventilating shaft 2, and when one methane stream is to blower fan 1, they will send early stage alarm.Imagination is permitted eurypalynous gauge table and monitor can be used for detecting the triggering of each event, and event triggers and triggers one or more IPL conversely.
Air vent 4 is arranged in the top board of conduit 5.Air vent 4 remains in make position at normal operation period, allows VAM to discharge and away from thermal oxidizer 10 from conduit 5 when opening.Opening of air vent 4 can be triggered by signal or signal combination, and described signal comprises the physics high pressure in high temperature in high methane signal that the gas monitor of being located at mine ventilation well 2 sends, the high-voltage signal of mine, thermal oxidizer, the high pressure of thermal oxidizer, conduit or the temperature in conduit.
The baffle plate 6 that length along conduit 5 is positioned at after air vent 4 is opened under normal operating conditions, closes, to increase the air-flow being flowed out conduit 5 by air vent 4 when power-off, high methane event or other events trigger.If usually have any triggering air vent 4 to open generation, baffle plate 6 can be closed automatically.Common trigger point is between about 1.5% and about 2.0% methane content, and this content is significantly less than the lower explosive limit of VAM.
Conduit 5 also comprises the dilution door 7 be positioned at than baffle plate 6 farther place.At thermal oxidizer standard run duration, dilution door 7 is normally closed.They also can be designed for progressively opening when thermal oxidizer is overheated, thus have the effect of the methane concentration dilution of the VAM by entering thermal oxidizer.Such as, the first dilution door 7 is opened 1075 DEG C time, and the second dilution door 7 is opened under 1125 DEG C or the combination of similar temperature.Similarly, the first dilution door 7 is opened when methane content is 1.0%, the second dilution door methane content be 1.5% or combination lower than the similar methane concentration of VAM lower explosive limit time open.
Dilution door 7 can also be opened by signal or signal combination, and described signal comprises high methane signal that the inductor that is arranged in mine ventilation well records, the high-voltage signal from mine, the high temperature from thermal oxidizer, temperature from the high pressure of thermal oxidizer, the physics high pressure of conduit or conduit.They also use as air vent.When diluting door 7 and being in an open position, induced draft fan 11 strengthens suction, sucks until thermal oxidizer, the extra air quantity provided by the dilution door 7 opened effectively to dilute and to remove the VAM in conduit.
Top along conduit 5 is the air vent 8 of a series of easy clutch, it is designed to be triggered by pressure signal, open when the low pressure of about 0.2 kPa of (kPa) (measurement unit), and other situation is by hindering the manifold pressure of the mechanism opened to trigger, opening about 0.25 kPa time.This design is called as the design of easy clutch.Likely, air blast panel can be used in this application and the combination of shutter of spring is housed, open mechanism to utilize difference and open a little to provide multiple, thus improve the level of integrity of security of system.
The reversing valve 9 being positioned at conduit 5 opens and closes when normal operation.In the event that power failure or high methane event occur, reversing valve 9 cuts out, and thermal oxidizer 10 and blower fan 1 are isolated.Ideally, certain time after this event should open (having the effect with air purge conduit 5) at dilution door 7 occurs.The exhaust ventilation side of thermal oxidizer stays open and is communicated with induced draft fan 11, and therefore, any methane of going around entering thermal oxidizer can both discharge in the normal fashion.In one form, reversing valve has labyrinth sealing, to guarantee that any leakage always flows to induced draft fan instead of Mine Ventilator 1.
At induced draft fan 11 just in the out of order event of the time point of mistake, air blast panel 12 will be activated.These air blast panels can be opened by the pressure (about 250 handkerchiefs) bottom thermal oxidizer.If the air vent 8 of air vent 4 and easy clutch is triggered by different opening signals, then this air vent can adopt identical type when needed.Similarly, if needed, the air vent 8 of dilution door 7, easily clutch and air blast panel 12 can adopt identical opens form.
Trigger in the event be recorded in event, a signal can be sent to open air vent, closing baffle plate, open dilution door and close reversing valve.Such as, the methane concentration preset is the sub-fraction of lower explosive limit (LEL), such as between 1% to 3%.
The T90 response time that Fig. 2 illustrates infrared rays methane monitor is 6.0 seconds.The Spline smoothing 14 being zero second place in timing can cause monitor to respond 15.This is not an express IR monitor, but can be used to time shown arranges (timing).Suppose that we control Spline smoothing 14, then all dilution doors were being opened after 0.2 second.Air vent 4 was starting to open after 0.4 second, opened completing through 0.9 second.In order to improve ventilation and dilution, curtain started landing at 0.4 second, closed completely at 6.5 seconds.Conduit between baffle plate 6 and thermal oxidizer can be full of air instead of VAM.Reversing valve started 0.4 second time close, closing completely through 15.4 seconds, therefore guaranteeing when methane Spline smoothing appears in ventilation fan 1, conduit by air purification and thermal oxidizer be isolated.The T90 response time is that the methane monitor of 24 seconds can be approximately slower than situation of enumerating above one second, but still is enough to make system works fast.
If only partial configuration air vent 4 and baffle plate 6, it still can improve the efficiency of dilution door 7.If air vent 4 and baffle plate 6 do not configure completely, so dilute goalkeeper VAM and be diluted to 1/3 of original content.Namely original content 0.5% 1/3, namely 0.17%.If isolating valve 9, air vent 4 and baffle plate 6 are out of order, suppose that dilution door normally runs, then the VAM entering thermal oxidizer is approximately 3.3%.
If above all safety devices are out of order, then only need air vent 8 and the air blast panel 12 of easy clutch.If every other safety device is out of order, so the overvoltage in thermal oxidizer and conduit must be remained on such as less than 2 kPas by the size of steam vent 8 and 12.The isolation of reversing valve 9 is added air blast panel 12 and is guaranteed if every other air vent, baffle plate and door are out of order, and detonation is still towards induced draft fan 11 instead of mine air-introduced machine 1.
Other safety devices can be present in the design of thermal oxidizer, the safety device such as described in PCT application PCT/AU2010/001217, such as effectively serve as the height of the flame trap of oxidator top of tower and the grid brick layer (chequer pack) of vent.Need to consider these devices in any layer of protection analysis.
Fig. 3 illustrates the variant of the equipment with higher level redundancy, therefore has lower residue risk.In this example, extra steam vent, baffle plate and dilution door is added.How single part is loaded independent protection layer (ILP) system to illustrate, system has made following mark:
Be labeled as the bypath system 16 of ILP1
Be labeled as the dilution door 17 of ILP2
Be labeled as the security system of each different thermal oxidizer of ILP3
Be labeled as the reverse isolation valve 9 of ILP4
Be labeled as the panel 18 of the easy clutch of ILP5
In addition, the same with included by figure 1 of mark.
Fig. 4 shows the method increasing extra topping.The thickness of the black arrow between ILP is directly proportional to risk frequency, and the risk do not slowed down from the thickest end falls the most advanced and sophisticated risk thoroughly slowed down of arrow.Risk reduces along with the increase of ILP.ILP3 refers to thermal oxidizer system (according to the different built-in system of thermal oxidizer design, or even not having system).ILP6 refers to further accessory system, such as flame trap, fire foam, water sprinkler etc.
Can increase other safety devices as required on conduit, to control Tolerable risk, such as, the resistance that ILP6 enumerates falls into device or more checker brick.These extra toppings can not change basic conception.This catheter design concentrates the reaction after avoiding unsafe incidents instead of event.Many markets system on sale is just contrary with it, and therefore, they not too meet layer of protection analysis (LOPA).Similarly, but contrary with safety, and reducing topping does not affect this concept.
Fig. 5 and 6 is the diagram size of practical application and the isometric representation of complexity.
In certain embodiments, before thermal oxidizer, have the adjustment conduit of large cross sectional area, wherein the speed of VAM is reduced to below 7m/s, preferably lower than 5m/s but higher than 2m/s, using the obscission zone as mud.
In certain embodiments, between blower fan and thermal oxidizer, before the baffle plate in conduit, air vent can make methane drain into air.
In certain embodiments, air vent is the blind system of snap action, even if shutter is in make position, it also can seepage methane.In certain embodiments, baffle plate is the fire screen of snap action.
In certain embodiments, conduit is regulated to comprise one or more air vents and baffle system.In certain embodiments, after baffle system, conduit is regulated to comprise one or more air vent (these are also referred to as dilution door in this application).
In certain embodiments, when by regulate detect that at least one VOC reaches lower explosive limit value a part of in the air-flow of conduit time, one or more safety door opens or closes.
In certain embodiments, high methane event can be detected well at catheter downstream, such as, reach air vent and first more than 10 seconds of baffle plate at high methane VAM.
In certain embodiments, the monitor T90 response time in Quick Measurement methane monitor is less than 5 seconds.
In certain embodiments, if there is detonation in conduit, fixing air vent is under low pressure opened.
Without departing from the scope of the present invention, to one skilled in the art, many amendments are apparent.
Claims (14)
1. a conduit, it is for being connected to thermal oxidizer by the source of the gas comprising VOC, wherein, described conduit has enough large cross-sectional diameter, the speed of the gas from source of the gas is reduced to below 7m/s before entering described thermal oxidizer, wherein, described conduit comprises baffle plate, along some place of the length of described conduit between its entrance at described conduit and described thermal oxidizer, described baffle plate can move between the open and the closed positions, time in an open position, gas can pass through along described conduit between the entrance of described conduit and described thermal oxidizer, and time in the close position, stop gas to cross described baffle plate along the length of described conduit and lead to described thermal oxidizer.
2. conduit according to claim 1, wherein, described source of the gas comprises methane and from coal mine ventilation system, it is introduced into the import of the conduit away from described thermal oxidizer by blower fan, or is drawn into the import of described thermal oxidizer by described conduit by the induced draft fan being positioned at described thermal oxidizer exit.
3. conduit according to claim 2, wherein, once the event of generation, described baffle plate moves to described make position from described open position.
4. conduit according to claim 3, wherein, described conduit also comprises air vent, along any point place of the length of described conduit between its entrance at described conduit and described baffle plate, wherein, described air vent can move between open mode and closure state.
5. conduit according to claim 4, wherein, once the event of generation, described air vent moves to described open mode from described closure state.
6. the conduit according to any one of claim 1 to 5, wherein, described conduit also comprises dilution door, to be introduced in gas through described conduit by the air of described conduit outside, thus dilutes the concentration of VOC described in described gas.
7. conduit according to claim 6, wherein, the air pressure in described conduit reaches in the event of predeterminated level, and described dilution door also can be used as air vent and uses.
8. the conduit according to any one of claim 1 to 5, wherein, described conduit also comprises one or more safe ventilation hole, these air vents remain on make position until after air pressure in described conduit reaches predeterminated level, now, safe ventilation hole moves to open position and is expelled to air to allow the gas in described conduit.
9. conduit according to claim 8, wherein, described one or more safe ventilation hole is formed with the form of easy clutch, wherein, when the pressure in described conduit reaches predeterminated level, opens described safe ventilation hole.
10. conduit according to claim 8, wherein, described predeterminated level is 250 handkerchief measurement units.
11. conduits according to any one of claim 1 to 5, wherein, described conduit also comprises isolating valve, and it is positioned at and is close to before described thermal oxidizer, and when described isolating valve closes, described thermal oxidizer and described conduit and described source of the gas can be isolated by it.
12. conduits according to claim 11, wherein, once the event of generation, described isolating valve closes.
13. conduits according to claim 3,5 or 12, wherein, described event be selected from following in one or more: have a power failure; The methane concentration of coal mine ventilation system is more than 1.5%; High pressure in coal mine ventilation system; High temperature in thermal oxidizer; High pressure in thermal oxidizer; High pressure in conduit; High temperature in conduit.
14. 1 kinds for the source of the gas comprising VOC being connected to safely the system of thermal oxidizer, described system comprises:
A. the conduit according to any one of claim 1 to 5; And
B. any monitor of certain relevant to source of the gas is positioned at;
Wherein, described monitor can detect event.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AU2010905205A AU2010905205A0 (en) | 2010-11-24 | System and apparatus for connecting a gas source to a thermal oxidiser | |
| AU2010905205 | 2010-11-24 | ||
| PCT/AU2011/001520 WO2012068628A1 (en) | 2010-11-24 | 2011-11-24 | System and apparatus for connecting a gas source to a thermal oxidiser |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103328769A CN103328769A (en) | 2013-09-25 |
| CN103328769B true CN103328769B (en) | 2015-08-26 |
Family
ID=46145295
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201180065798.2A Expired - Fee Related CN103328769B (en) | 2010-11-24 | 2011-11-24 | For source of the gas being connected to system and the equipment of thermal oxidizer |
Country Status (8)
| Country | Link |
|---|---|
| US (1) | US20130340872A1 (en) |
| EP (1) | EP2643551A4 (en) |
| CN (1) | CN103328769B (en) |
| AU (1) | AU2011334608B2 (en) |
| CA (1) | CA2820643A1 (en) |
| CO (1) | CO6741146A2 (en) |
| NZ (1) | NZ612115A (en) |
| WO (1) | WO2012068628A1 (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108348793B (en) * | 2015-10-30 | 2021-09-28 | 联邦科学和工业研究组织 | Pipe system |
| WO2017097733A1 (en) * | 2015-12-07 | 2017-06-15 | Dürr Systems Ag | A mixing and processing system of ventilation air methane and coal mine methane |
| CN108397223A (en) * | 2018-03-14 | 2018-08-14 | 北京昊华能源股份有限公司 | A kind of main fortune head ventilating duct |
| CN110486090A (en) * | 2019-08-22 | 2019-11-22 | 煤科集团沈阳研究院有限公司 | A kind of Coal Mine Disasters active prevention and control disaster reduction system and control method |
| CN114772273B (en) * | 2022-06-22 | 2022-09-16 | 国机传感科技有限公司 | Detector conveying system with state sensing function |
Family Cites Families (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA1105825A (en) * | 1977-09-26 | 1981-07-28 | Kenneth Ellison | Incinerator and waste products convertor |
| US4662126A (en) * | 1986-05-23 | 1987-05-05 | Fike Corporation | Vibration resistant explosion control vent |
| US5215018A (en) * | 1990-06-26 | 1993-06-01 | White Horse Technologies, Inc. | Pollution control apparatus and method for pollution control |
| AU2848192A (en) * | 1991-11-21 | 1993-05-27 | Donald Ray Cummings | Improvements in reducing the environmental impact of coal mining |
| US5921763A (en) * | 1996-05-02 | 1999-07-13 | Thermatrix, Inc. | Methods for destroying colliery methane and system for practicing same |
| AUPP222398A0 (en) * | 1998-03-10 | 1998-04-02 | Gray, Ian | Temporary ventilation system for mining or tunnelling |
| CN201292859Y (en) * | 2008-11-28 | 2009-08-19 | 山东理工大学 | Mine ventilation air oxidation apparatus |
| CN101769536B (en) * | 2008-12-31 | 2011-08-10 | 中国神华能源股份有限公司 | System for enabling mine ventilation gas to participate combustion of thermal power plant coal boiler |
| CN201424957Y (en) * | 2009-05-15 | 2010-03-17 | 淄博柴油机总公司 | Coal bed methane-mixing intake system of ventilation air methane oxidation system |
| AU2010295247B2 (en) * | 2009-09-18 | 2015-01-29 | Corky's Management Services Pty Ltd | Process and apparatus for removal of volatile organic compounds from a gas stream |
| CN101845960A (en) * | 2010-05-07 | 2010-09-29 | 大连海事大学 | Ventilation air methane countercurrent oxidation device with flue gas suction device |
-
2011
- 2011-11-24 EP EP11842975.2A patent/EP2643551A4/en not_active Withdrawn
- 2011-11-24 WO PCT/AU2011/001520 patent/WO2012068628A1/en active Application Filing
- 2011-11-24 US US13/989,623 patent/US20130340872A1/en not_active Abandoned
- 2011-11-24 NZ NZ612115A patent/NZ612115A/en not_active IP Right Cessation
- 2011-11-24 AU AU2011334608A patent/AU2011334608B2/en not_active Ceased
- 2011-11-24 CN CN201180065798.2A patent/CN103328769B/en not_active Expired - Fee Related
- 2011-11-24 CA CA2820643A patent/CA2820643A1/en not_active Abandoned
-
2013
- 2013-05-24 CO CO13128069A patent/CO6741146A2/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| CA2820643A1 (en) | 2012-05-31 |
| NZ612115A (en) | 2015-01-30 |
| WO2012068628A1 (en) | 2012-05-31 |
| CN103328769A (en) | 2013-09-25 |
| AU2011334608B2 (en) | 2015-07-16 |
| CO6741146A2 (en) | 2013-08-30 |
| AU2011334608A1 (en) | 2013-05-02 |
| EP2643551A4 (en) | 2018-01-10 |
| EP2643551A1 (en) | 2013-10-02 |
| US20130340872A1 (en) | 2013-12-26 |
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