CN206053929U - For the ignition installation of Underground Coal Gasification Process - Google Patents
For the ignition installation of Underground Coal Gasification Process Download PDFInfo
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- CN206053929U CN206053929U CN201620934250.7U CN201620934250U CN206053929U CN 206053929 U CN206053929 U CN 206053929U CN 201620934250 U CN201620934250 U CN 201620934250U CN 206053929 U CN206053929 U CN 206053929U
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- fuel
- ignition
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- coal
- ignition installation
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Abstract
This utility model provides a kind of ignition installation for Underground Coal Gasification Process.Ignition installation of the present utility model includes the conveyer device being linked in sequence each other, disconnects device, igniter fuse and one or more fuel bags, and plurality of fuel bag is one another in series, and wherein：The conveyer device is coiled tubing, conjugation tube or integrated signal cable；The igniter fuse extends through one or more fuel bags and for starting ignite one or more fuel bags from equipment end with delayed mode；The disconnection device is disconnected after starting ignition fuse, is thus withdrawn including the ignition installation part including conveyer device to as little as home；Subterranean coal is lighted comprising thermite and after being used to be ignited with the fuel bag.
Description
Technical field
This utility model provides a kind of ignition installation for Underground Coal Gasification Process, additionally provides this igniting and sets
The standby application in Underground Coal Gasification Process ignition phase.
Background technology
Underground coal gasification(UCG) (UCG or ISC) process is in the presence of an oxidizer will by the burning and gasification of subterranean coal
Coal is converted into the process of product gas (also referred to as crude synthesis gas), and the product gas can be subsequently used for various applications, including
Fuel production, chemicals production and generating etc..In view of the increasingly stricter environmental requirement of mining industry in view of related artificial
Cost and capital construction cost, this coal underground gasification technology suitable for most of coal deposits are undoubtedly very attractive.
In Underground Coal Gasification Process, corresponding completion system generally to be provided with subterranean coal.The completion system
System generally include for inject various reagents such as oxidant (such as air, oxygen-enriched air or pure oxygen), gasifying agent and coolant (water,
Water vapour and carbon dioxide can be used as gasifying agent and coolant simultaneously, and air also can be used as coolant) etc. injection well, for moving
Various service wells except the withdrawal well of product gas and for helping out, wherein in injection well, withdrawal well and service well generally
Be equipped with sleeve pipe and/or internal lining pipe and communicate with each other on demand, wherein the service well generally include ignition well, freezing well,
Barrier wells and protection well etc., wherein injection well are usually horizontal orientation well, and withdrawal well and service well typically level is fixed
To well or peupendicular hole.
Therefore, in Underground Coal Gasification Process, most basic completion system is by communicating with each other and laid inside has sleeve pipe
And/or injection well and the output well construction of internal lining pipe, also known as underground coal gasification(UCG) unit or well pair.
In Underground Coal Gasification Process, related subterranean zone includes combustion zone, gasification zone and pyrolysis zone, wherein：Burning
Area typically starts to extend from oxidant and gasifying agent decanting point, and in combustion zone, coal occurs combustion in the presence of oxidant and gasifying agent
Burn and gasify；Gasification zone is located at combustion zone downstream or is centered around around combustion zone with radial, and in gasification zone, coal is mainly by gas
Change and partial oxidation generates product gas；Pyrolysis zone is located at gasification zone downstream, and the pyrolysis of coal occurs in pyrolysis zone.For preferable coal
For charcoal underground gasification process, it is generally desirable to the pyrolysis of coal is as few as possible.With the gradually propulsion of Underground Coal Gasification Process, coal
The burned out area formed in layer becomes larger, and finally descends coal deposits to be consumed completely, only leaves coal ash.
In Underground Coal Gasification Process, the product gas for being generated generally comprise CO, CO2、H2、CH4And solid particle, water,
Coal tar and hydrocarbon and a small amount of H2S、NH4With COS etc..The concrete composition of the product gas generally depends on Multiple factors, including institute
The presence (coal seam water or surrounding formations penetrate into the water in coal seam) of the oxidant (such as air, oxygen-enriched air or pure oxygen), water that use,
The quality of coal and the technological parameter (temperature and pressure etc.) for being adopted.
Start Underground Coal Gasification Process to light subterranean coal, need in oxidant such as air, oxygen-enriched air or pure
In the presence of oxygen, subterranean coal is heated to into ignition point.Various coals such as brown coal, bituminous coal, anthracite, the ignition point of coke are generally
400-700℃.After oxidant is sufficient and temperature reaches ignition point, it is no longer necessary to which outside heat supply, coal seam can pass through own combustion
To maintain whole burning/gasification.
Therefore, in the ignition phase of Underground Coal Gasification Process, light subterranean coal and be allowed to sustained combustion need fuel,
Heat and oxidant, wherein coal to be gasified itself can be used as fuel, initial heat is usually from external source including outer
The heat that the fiery fuel combustion of adding some points is produced, oxidant such as air or oxygen is generally also by being externally supplied.
In Underground Coal Gasification Process, subterranean coal is safely and efficiently lighted in the case where well system integrity is kept
It is extremely important, but in the prior art, the ignition phase of Underground Coal Gasification Process still suffers from problem and needs in many aspects
Improve.
Specifically, in terms of fuel, igniter fuel commonly used in the prior art such as boron triethyl (TEB, (C2H5)3) or silicon B
Alkane (SiH4) or their mixture meetings generally when air or oxygen is exposed to lower carbon number hydrocarbons such as methane, ethane, propane etc.
React, use safety not enough, and dirt band layer that may be present is also unfavorable for that coal seam is lighted a fire in subterranean coal；In heat
In terms of amount, injecting into well bushing pipe and/or sleeve pipe may affect initial heat when lighting a fire to focus on target coal seam, and wetter coal seam needs
Want more heat of vaporization moisture and make ignition difficulties, withdrawal well temperature will be also kept in ignition process to prevent coal volatile matters and coal
Thermal decomposition product heavy constituent (such as tar, Colophonium etc.) condensation causes output well plugging；In addition, oxidant introducing and use and
Problem or defect be there is also in terms of the selection and configuration of equipment.
If it is possible to further improve igniter fuel to provide more initial heats and further improve or optimization
Well system configuration is making full use of the initial heat necessarily favourable.
WO2014/089603A1 discloses a kind of equipment for subterranean coal igniting, as shown in its accompanying drawing 1, its midpoint
Fiery equipment is hybrid chamber 40 between entrance 15 and outlet 17, and igniter fuel and oxidant mixture, institute are included in the hybrid chamber
It can be hydrocarbon gas such as methane, propane, butane etc. to state igniter fuel, and oxidant can be oxygen containing for air, oxygen-enriched air, richness
Admixture of gas or pure oxygen, the ignition installation also include flammable burner nozzle end 35, the burner nozzle end that this is flammable
Itself is flammable and can further include thermite, it is therefore an objective to promote coal seam to light a fire by burning or exothermic heat of reaction.Understanding should
In patent it is main by lower carbon number hydrocarbons oxy combustion realizing igniting, although promoting lower carbon number hydrocarbons to burn wherein using thermite,
The fuel and heat supply of Underground Coal Gasification Process ignition phase are not solved well.
For prior art, this utility model further improves the ignition phase of Underground Coal Gasification Process and wherein institute
Using ignition installation, especially improve the heat supply of the fuel and ignition phase of ignition installation, such that it is able to preferably
Realize that subterranean coal is lighted a fire.
Utility model content
For prior art, this utility model provides a kind of ignition installation for Underground Coal Gasification Process, also carries
Application of this ignition installation in Underground Coal Gasification Process ignition phase is supplied.
This utility model provides a kind of ignition installation for Underground Coal Gasification Process, wherein the ignition installation bag
Include conveyer device, disconnection device, igniter fuse and one or more the fuel bags being linked in sequence each other, plurality of fuel bag
It is one another in series, and wherein：
The conveyer device is coiled tubing, conjugation tube or integrated signal cable；
The igniter fuse extends through one or more fuel bags and for starting to draw from equipment end with delayed mode
Fire one or more fuel bags；
The disconnection device is disconnected after starting ignition fuse, is thus withdrawn including the ignition installation portion including conveyer device
Part is to as little as home；With
Thermite is included in the fuel bag and for subterranean coal is lighted after being ignited, the thermite is aluminium powder and energy
The granular mixture of enough metal-oxides that thermit reaction occurs therewith, the metal-oxide selected from iron sesquioxide, four
Fe 3 O, copper oxide, nickel sesquioxide, nickel oxide, vanadic anhydride, chromic oxide and manganese dioxide, preferably three oxygen
Change two ferrum and ferroso-ferric oxide, wherein 0.5- of the mixing ratio of aluminium powder and the metal-oxide for thermit reaction stoichiometric proportion
2.0th, 0.7-1.5 and more preferably 0.8-1.2 times are preferably, and the consumption of wherein described thermite is enough to provide 20 seconds to 10 points
Clock, the duration of ignition of preferably 30 seconds to 7 minutes.
This utility model additionally provides a kind of coal underground gasification method, wherein being provided with subterranean coal for coal ground
The completion system of lower gasification, wherein being lighted a fire using ignition installation of the present utility model, and starts to gasify after igniting success
Journey, wherein when conveyer device is coiled tubing or during conjugation tube, inside coiled tubing or conjugation tube and coiled tubing or conjugation tube
It is used as the oxidant channel of ignition phase with the annular space injected into well between bushing pipe, and when conveyer device is integrated signal cable
When, sealed fuel bag and injected into well between bushing pipe with pipeline righting circle and pushed away as fuel bag using injecting into well bushing pipe after annular space
Send the oxidant channel of gas passage and ignition phase.
According to this utility model, ignition installation combination application conveyer device, device, igniter fuse and one are disconnected
Or multiple fuel bags, wherein conveyer device can convey and position fuel bag exactly, and igniter fuse is with delayed mode from equipment
End start to ignite one or more fuel bags (i.e. from the fuel closest to the equipment end unwrap the beginning or from igniter fuse
The beginning is unwrapped apart from farthest fuel), disconnect device and disconnect after starting ignition fuse, it is possible thereby to withdraw exist including conveyer device
To as little as home for subsequent applications, and the fuel bag can provide foot Jing after specific design to interior ignition installation part
Enough initial heats heat subterranean coal to its ignition point, thus light subterranean coal.
According to this utility model, in the coal underground gasification method, break down as there is output in ignition phase
Well plugging and/or oxygen leakage and in the case of unignited coal seam, or in gasification occur coal seam interrupt can not continue gas
In the case of change, it is possible to use ignition installation of the present utility model is lighted a fire again, light a fire including regnition and repeatedly, directly
To coal seam is lighted again, so as to ensure that the final enforcement of Underground Coal Gasification Process.
Therefore, using ignition installation of the present utility model safely and efficiently can realize subterranean coal igniting with start and/
Or continue Underground Coal Gasification Process, it is that prior art brings progress.
Description of the drawings
Below with reference to the accompanying drawings further describing this utility model, wherein：
Fig. 1 is in the signal for injecting into well bushing pipe interior part according to a kind of ignition installation of embodiment of this utility model
Figure, wherein by the use of coiled tubing or conjugation tube as conveyer device and utilize inside coiled tubing or conjugation tube and coiled tubing or
Conjugation tube and the annular space between bushing pipe is injected into well as the oxidant channel of ignition phase；
Fig. 2 gives the embodiment of this utility model ignition installation shown in Fig. 1 including injection well and during above ground portion
Complete diagram；
Fig. 3 is in the signal for injecting into well bushing pipe interior part according to the ignition installation of this utility model another embodiment
Figure, wherein by the use of integrated signal cable as conveyer device, and seal fuel bag using pipeline righting circle and inject into well bushing pipe
Between annular space, thus using the oxidant channel for injecting into well bushing pipe and pushing as fuel bag gas passage and ignition phase,
3 fuel bags are which used, and stopper is equipped with 3 fuel bag two ends and pipeline righting circle is all cased with two stoppers；
Fig. 4 gives the embodiment of this utility model ignition installation shown in Fig. 3 including injection well and during above ground portion
Complete diagram.
In the drawings, identical reference refers to same parts.Specifically, the reference implication being related in each accompanying drawing
It is as follows：
1st, coal seam；2nd, boot band (undergauge clip is as igniting positioning baffle)；3rd, inject into well bushing pipe；4th, stopper is (front
End plug is used to balance for closure and tail end stopper)；5th, fuel bag (3 fuel bags are one another in series)；6th, igniter fuse (igniting
Fuse extends through 3 fuel bags)；7th, disconnect device；8th, distributed temperature, pressure and sonic sensor (are fixed on injection well
Also it is fixed on coiled tubing outer wall outside internal lining pipe and using during coiled tubing)；9th, check-valves (ball+spring type)；10th, it is outside
Grapple adapter；11st, oxidant channel；12nd, coiled tubing/conjugation tube；13rd, gasification zone direction；14th, inject casing；15th, well
Mouth coolant/air inlet；16th, the standby coolant inlet of well head；17th, well head control device；18th, coiled tubing reel
(connection instrument and data transmission link in central shaft)；19th, swivel joint；20th, ground oxidizer source pipeline；21st, integrated signal
Cable；22nd, cable connector；23rd, pipeline righting circle；24th, cable service car.
Specific embodiment
This utility model provides a kind of ignition installation for Underground Coal Gasification Process, additionally provides this igniting and sets
The standby application in Underground Coal Gasification Process ignition phase.
Specifically, this utility model provides a kind of ignition installation for Underground Coal Gasification Process, wherein the point
Fiery equipment includes the conveyer device being linked in sequence each other, disconnects device, igniter fuse and one or more fuel bags, wherein many
Individual fuel bag is one another in series, and wherein：
The conveyer device is coiled tubing, conjugation tube or integrated signal cable；
The igniter fuse extends through one or more fuel bags and for starting to draw from equipment end with delayed mode
Fire one or more fuel bags；
The disconnection device is disconnected after starting ignition fuse, is thus withdrawn including the ignition installation portion including conveyer device
Part is to as little as home；With
Thermite is included in the fuel bag and for subterranean coal is lighted after being ignited, the thermite is aluminium powder and energy
The granular mixture of enough metal-oxides that thermit reaction occurs therewith, the metal-oxide selected from iron sesquioxide, four
Fe 3 O, copper oxide, nickel sesquioxide, nickel oxide, vanadic anhydride, chromic oxide and manganese dioxide, preferably three oxygen
Change two ferrum and ferroso-ferric oxide, wherein 0.5- of the mixing ratio of aluminium powder and the metal-oxide for thermit reaction stoichiometric proportion
2.0th, 0.7-1.5 and more preferably 0.8-1.2 times are preferably, and the consumption of wherein described thermite is enough to provide 20 seconds to 10 points
Clock, the duration of ignition of preferably 30 seconds to 7 minutes.
According to this utility model, in the ignition installation, the conveyer device can be coiled tubing or conjugation tube or
Integrated signal cable, the conveyer device can be conveyed exactly and position fuel bag.
According to this utility model, in the ignition installation, when using coiled tubing or conjugation tube as conveyer device,
Inside coiled tubing or conjugation tube and coiled tubing or conjugation tube and the annular space injected into well between bushing pipe can be employed as rank of lighting a fire
The oxidant channel of section.
According to this utility model, in the ignition installation, when using coiled tubing as conveyer device, can be by connecting
Continuous oil pipe injects high concentration oxygen agent such as pure oxygen to subterranean coal, this is because coiled tubing is height air-tightness part, can be with
Avoid using safety problem that may be present during high concentration oxygen agent such as pure oxygen.
As known in the art, coiled tubing is generally wound on coiled tubing reel, is passed through under job state
Coiled tubing reel winding realizes the release of coiled tubing and withdraws that the selection of coiled tubing and its reel is, it is ensured that coiled tubing
Wellhole development length inside coal seam place depth and coal seam can be arrived at.
According to this utility model, in the ignition installation, can also be using conjugation tube as conveyer device, for not adopting
With the situation of high concentration oxygen agent such as air gasification, it is very economical scheme using common conjugation tube, weak point is to insert
Take during entering subterranean coal and withdrawing more and labor intensity is larger.
According to this utility model, in the ignition installation, can lead to as the coiled tubing and conjugation tube of conveyer device
Cross suitable connected mode to be connected with other parts, for example the two can be effective with other parts by external grapples adapter
Connection, the external grapples adapter can be realized non-solder connection and provide airtight sealing, it is possible thereby to easily change
With maintenance ignition installation other parts, in addition, conjugation tube can also be connected with other parts by hickey.
According to this utility model, in the ignition installation, when using coiled tubing or conjugation tube as conveyer device,
One or more check-valves can also be connected between the coiled tubing or conjugation tube and disconnection device, be mainly used in prevention inverse
The coiled tubing or conjugation tube are entered to air-flow so that ignition installation associated components keep cleaning and remove in ground well head or
Safeguard protection is provided when withdrawing equipment, the check-valves can be applicable any kind of non-return known to those skilled in the art
Valve, for example, can be spring stop valve or ball+spring type etc..
According to this utility model, in the ignition installation, when using integrated signal cable as conveyer device, typically
Need to seal using pipeline righting circle and fuel bag and inject into well the annular space between bushing pipe, it is possible thereby to using injecting into well bushing pipe
The oxidant channel of gas passage and ignition phase is pushed as fuel bag, and during conveying fuel bag, can basis
Cable level of tightness determines whether fuel bag reaches predetermined ignition position, and can reduce fuel bag push gas stream after arrival
While keeping fuel bag to position to avoid cable excessively tight, wherein integrated signal cable can pass through cable connector to amount
Device is connected and cable length is likely to become limiting factor with disconnecting.
According to this utility model, in the ignition installation, the disconnection device is one kind from breaking mechanism, it is possible to use pressure
Force signal or the signal of telecommunication start, for disconnecting after starting ignition fuse, it is possible thereby to withdraw including the point including conveyer device
Fiery part of appliance to as little as home for subsequent applications, so as to be reduced in Underground Coal Gasification Process to a certain extent
Equipment loss.
According to this utility model, in the ignition installation, the igniter fuse extends through one or more fuel bags,
The whole fuel bags for being used are extended through, it can utilize pressure signal or the signal of telecommunication to start, and for delayed mode
Start one or more fuel bags that ignite from equipment end, wherein can ignite in fuel coating with delayed mode pilot fuel bag
Disconnect and withdraw including the ignition installation part including conveyer device to as little as home using disconnection device before.
As used herein, " from the beginning of equipment end " refers to from the fuel closest to the equipment end unwrap
Begin, that is to say, that unwrap beginning apart from farthest fuel from igniter fuse.Specifically, when ignite multiple fuel bags when, igniting is drawn
Believer in a certain religion start to ignite closest to the fuel bag (i.e. with igniter fuse apart from farthest fuel bag) of the equipment end and and then according to
Secondary each fuel bag that ignites backward.
According to this utility model, in the ignition installation, the igniter fuse and disconnection device can utilize pressure
Signal or the signal of telecommunication start, and Selection utilization which kind of signal enabling is typically based on used conveyer device to determine, it is determined that former
It is then to simplify process operation and control as far as possible.
Specifically, when using coiled tubing or conjugation tube as conveyer device, the igniter fuse and disconnect device and lead to
Often started using pressure signal independently of one another, when using integrated signal cable as conveyer device, the igniter fuse with
Disconnect device generally to start using the signal of telecommunication independently of one another, when starting using pressure signal, start the pressure for disconnecting device
Generally outline is sequentially activated with guaranteeing the two higher than the pressure of starting ignition fuse, such as operating pressure is the gas of 45barg
Change process, can adopt the pressure-activated disconnection device of the pressure-activated igniter fuse and 50barg of 47.5barg, and when using electricity
During signal enabling, igniter fuse and disconnection device are sequentially activated by the independent signal of telecommunication respectively.
According to this utility model, in the ignition installation, subterranean coal is lighted using the fuel bag of specific design, its
The fuel included by middle specific design the fuel bag itself and its inside.
According to this utility model, in the ignition installation, the fuel bag can be single fuel bag or be one another in series
Multiple fuel bags, thermite is included in the fuel bag and for lighting subterranean coal, the shape of the fuel bag after being ignited
Shape typically will be matched with bushing pipe is injected into well, and for example, the shape of the fuel bag can be cylindrical shape, and the external diameter of the cylinder will
Match with bushing pipe internal diameter is injected into well, to ensure that the fuel bag can be moved freely in bushing pipe is injected into well, so as to defeated
It is sent to predetermined ignition position.
According to this utility model, in the ignition installation, the shell of the fuel bag is usually high pressure water proof type shell,
Preferably there is proper strength and can be by thermit reaction molten metal shell, more preferably (aluminum fusing point is about aluminum shell
680 DEG C), such that it is able to keep fuel bag inject into well conveyed in bushing pipe when structural integrity, again can fuel coating draw
It is completely burned off after combustion；In addition, optionally also for example not complete including the weak spot of some random distributions on the shell of the fuel bag
The drilling for drilling through entirely, so as to be conducive to discharging issuable gas in thermit reaction；Further, after ignition location positioning,
The fuel bag may also operate as the effect for blocking igniting forward position passage in itself, to force the oxidant of injection to a certain extent
Stream is used to light a fire into coal seam.
According to this utility model, in the ignition installation, optionally start in one or more fuel bags from equipment end
Front end is provided with and is provided with identical stopper for balance, institute with multiple fuel bag tail ends for the stopper for blocking igniting forward position passage
The material for stating stopper is generally the metal of carbon steel or fusing point higher than aluminum.
Specifically, in ignition installation of the present utility model, from closest to from the beginning of the equipment end, optionally at one or
Multiple fuel bag front ends (i.e. with igniter fuse apart from farthest fuel bag end) are provided with the plug for closure igniting forward position passage
Son, the material of the closure stopper are generally the metal of carbon steel or fusing point higher than aluminum, it is possible thereby to more long than fuel bag itself
Ground closure igniting forward position passage, entering coal seam with the oxidant stream for forcing more injections is used to light a fire, and when using multiple fuel
Generally also the phase for balance is provided with multiple fuel bag tail ends (the fuel bag end closest with igniter fuse) during bag
Same stopper, thus makes multiple fuel bags that balance is preferably kept during traveling.
In addition, as already mentioned, when using integrated signal cable as conveyer device, needing to help using pipeline
Just enclose sealing fuel bag and inject into well the annular space between bushing pipe, pipe now can be cased with one or more fuel incrustations
Pipeline righting circle is cased with road righting circle, and/or the balance stopper existed in the closure stopper and multiple fuel bags,
Thus seal and fuel bag and inject into well the annular space between bushing pipe, make to inject into well lining pipe and gas is pushed for use as fuel bag and lead to
The oxidant channel in road and ignition phase, wherein the pipeline righting circle typically has low-friction coefficient, its material can be rubber
Glue, preferably high density polyethylene (HDPE).
As be known in the art, the thermite is the mixture of aluminium powder and some metal-oxides, when being ignited
The latter two occur thermit reactions is reduced the metal in metal-oxide, and the thermit reaction is acutely carried out and releases substantial amounts of
Heat, up to 2000-3000 DEG C, such as aluminum is 945.4cal/g and temperature reachable about 2500 with the reaction heat of iron sesquioxide to temperature
DEG C, but the thermite itself is again highly stable, can safely process and use.
Therefore, the thermit reaction of thermite is the safe and effective method that enough heats are produced in limited bulk, and thus
Some can be caused to need the reaction of high temperature hyperpyrexia.The characteristics of this utility model is based on thermite devises the fuel bag.
According to this utility model, in the ignition installation, thermite is included in the fuel bag and for after being ignited
Subterranean coal is lighted, the thermite is aluminium powder and the graininess mixing of the metal-oxide of thermit reaction can occur therewith
Thing, the metal-oxide can be selected from iron oxides such as iron sesquioxide and ferroso-ferric oxide, the oxidations of nickel oxide such as three two
Nickel and nickel oxide and copper oxide, vanadic anhydride, chromic oxide and manganese dioxide, preferably iron sesquioxide and four oxygen
Change three-iron, wherein the mixing ratio of aluminium powder and the metal-oxide generally according to the stoichiometric proportion of thermit reaction determining having
Body can be the 0.5-2.0 of thermit reaction stoichiometric proportion, be preferably 0.7-1.5 and more preferably 0.8-1.2 times, and wherein institute
The consumption for stating thermite can be suitably selected based on the required duration of ignition, should preferably be enough to provide 20 seconds to 10 minutes, it is excellent
Select the duration of ignition of 30 seconds to 7 minutes.
According to this utility model, in the ignition installation, can also diluent be included to reduce which in the fuel bag
Burning velocity and the corresponding prolongation duration of ignition, the diluent typically granular solids fuel is preferably selected from solid hydrocarbons
And powdered carbon, the consumption of the diluent generally also suitably can select, typically can be less than diluent and aluminothermy agent composition
40wt%, preferably more than 30wt%, more preferably no more than 25wt%.
According to this utility model, in the ignition installation, the thermite and optional diluent in the fuel bag is equal
For particulate material, their grain graininess suitably can be selected, but generally tend to using the less content of grain graininess
To improve fuel bag heating efficiency, for example, the grain graininess of the thermite and the diluent can be each independently
200nm-5.0mm, preferably 300nm-4.0mm, more preferably 500nm-2.5mm.
According to this utility model, in the ignition installation, after fuel coating is ignited, thermite therein occurs
Thermit reaction, it is understood that there may be diluent fuel then there is burning, the heat produced during these be enough to burn outside fuel bag
Injecting into well the Free water at bushing pipe, evaporation ignition location in coal seam and lift coal seam temperature to catching fire at shell and ignition location
Point, finally realizes that coal seam is lighted a fire.
Therefore, according to this utility model, in the ignition installation, regulation aluminium powder can be passed through mixed with metal-oxide
Composition and division in a proportion, the selection for changing diluent and consumption and change grain graininess of thermite and/or diluent etc. to be designed, by
This changes the thermal discharge of fuel bag and duration of ignition etc., so as to optimize the ignition process of underground coal gasification(UCG).
For example, can with stoichiometric proportion, (i.e. mol ratio be 2 by aluminium powder and iron sesquioxide:1) thermite is formed, then
Mix (about 15wt% of the powdered carbon consumption for total mixture) with powdered carbon, the grain graininess for controlling formed mixture is for about 1mm,
Then the mixture is used in fuel bag of the present utility model.
According to experiment measurement, the burn time duration after this mixture (6.35 pounds) ignition reaction is for about 30 seconds, and common property is given birth to about
The heat of 11.4MJ, and this sufficiently achieves following effect：Melt the aluminum shell of fuel bag；Heating evaporated fuel bag and injection
Water in well internal lining pipe annular space in 2 feet of distances；Melt 3 feet long of aluminum internal lining pipe；Heating 237Nm3The nitrogen of/h is extremely
650℃；650 DEG C of ignition point is reached with heating coal seam.
So, in the fuel bag for being applied in combination 10 this specifications and after igniting successively one by one, then the combustion of 5 minutes can be provided
The heat of duration and about 114MJ is burnt, so as to be enough to light subterranean coal.This shows that fuel bag of the present utility model can be fine
Ground is in Underground Coal Gasification Process midpoint fire coal layer.
This utility model additionally provides a kind of coal underground gasification method, wherein being provided with subterranean coal for coal ground
The completion system of lower gasification, wherein being lighted a fire using ignition installation of the present utility model, and starts to gasify after igniting success
Journey, wherein when conveyer device is coiled tubing or during conjugation tube, inside coiled tubing or conjugation tube and coiled tubing or conjugation tube
It is used as the oxidant channel of ignition phase with the annular space injected into well between bushing pipe, and when conveyer device is integrated signal cable
When, sealed fuel bag and injected into well between bushing pipe with pipeline righting circle and pushed away as fuel bag using injecting into well bushing pipe after annular space
Send the oxidant channel of gas passage and ignition phase.
According to this utility model, in the coal underground gasification method, in injection well vertical section jacket exterior, injection well
Temperature, pressure harmony are respectively fixed with outside internal lining pipe, outside withdrawal well well head, withdrawal well internal lining pipe and on coiled tubing outer wall
Wave sensor, for obtaining temperature, pressure and the acoustic signals of subterranean coal and feeding back to the control system near well head.
According to this utility model, the temperature, pressure and sonic sensor can be to be measured based on fiber optical time domain reflection
The distributed sensing optical fiber of technology (Optical Time-Domain Reflectometry--OTDR), the optical fiber can be with
Target measurement point is extended to by near well head or the central shaft of coiled tubing reel, it is bent to obtain corresponding temperature
Line, pressure curve and sound wave curve are used for monitors ignition position, burning zone position, subterranean coal Expenditure Levels, injection well, output
Temperature and pressure and well system integrity of well and gasification zone etc., so as to control Underground Coal Gasification Process, and temperature sensing
Device additionally or alternatively uses bimetallic sheath K-type dual probe thermocouple.
Specifically, according to this utility model, the function of each temperature, pressure and sonic sensor is described as follows：
Be fixed on temperature outside injection well vertical section jacket exterior, withdrawal well well head and withdrawal well internal lining pipe, pressure and
Data Source of the sonic sensor mainly as safety system, temperature is too high, hypertonia is (such as when the position temperature
When degree and/or pressure reach marginal value or exceed design safety value) when can automatic cut-off system operation, and control system can be based on
It is complete to guarantee well system that the acoustic signals of these sensors tackle relevant issues at any time；
It is fixed on and injects into well instrument port near temperature outside bushing pipe, pressure and the general Jing well heads of sonic sensor
Gasification zone is extended to, and by measurement feedback is to control system and is stored into data base, wherein temperature and pressure sensing
Device is mainly used in the pressure of gasification zone in the temperature and pressure in monitoring subterranean coal, the temperature of ignition location and subterranean coal,
Wherein sonic sensor is mainly used to confirm ignition location, usually, when gasification zone temperature>600 DEG C, for example, 600-1200
DEG C when, it is believed that gasified along bushing pipe direction coal seam is injected into well, and the temperature be higher than 1,200 DEG C when then mainly send out
Soft coal burns, in addition, when being all consumed along the subterranean coal for injecting into well bushing pipe, also can automatic cut-off system operation；
When using coiled tubing as conveyer device, temperature, pressure and the sound wave being fixed on coiled tubing outer wall is passed
Sensor can extend to the oxidant nozzle that may be used from the central shaft of coiled tubing reel, these sensors with it is wireless
Transmission equipment connects, by measurement feedback is to control system and is stored into data base.
According to this utility model, based on the temperature of design as described above, pressure and sound wave signal acquiring system, it is possible to achieve
To the good control including the whole Underground Coal Gasification Process including ignition phase.
According to this utility model, for the completion system being located in the ground in coal seam, well system (includes injection well and product
Go out well) internal lining pipe can be linked together using any suitable connected mode commonly used in the art, can for example adopt
The connected modes such as welding, screw thread, clip groove, flange, cutting ferrule or card pressure, the principle for being followed are to ensure that final completion system
Can be best.
According to this utility model, for the completion system, it is critically important ingredient to inject into well bushing pipe, it
Function it is intact be important guarantee that whole Underground Coal Gasification Process is smoothed out.
Specifically, inject into well the function major embodiment of bushing pipe in the following areas：First, it is coal ground to inject into well bushing pipe
It is used for the important channel that flow of fluid and equipment are moved during lower gasification；Secondly, inject into well between bushing pipe and coal bed drilling
Annular space also can be used as flow channel after with inert gas purge, for example, igniting success after, if coal seam very be dried and/
Or during the gasification more gasifying agents of needs, additional gasifying agent can be injected by the passage；Again, in order to monitor subterranean coal
Consumption position and related process parameters, stationary distribution formula temperature, pressure and sound wave can pass on bushing pipe outer wall is injected into well
Sensor, to provide corresponding temperature, pressure and sound wave profile distribution curve.
According to this utility model, the material for injecting into well bushing pipe typically can be selected according to subsurface formations lithostatic pressure and hydrostatic pressing
Select；The internal diameter for injecting into well bushing pipe is typically matched with fuel bag external diameter；Bushing pipe inwall is injected into well with coiled tubing or engagement
Annular space between pipe can be used as flow channel, be used for example as the oxidant channel of ignition phase；Generally prolong with bushing pipe is injected into well
The bottom of subterranean coal is reached nearby and above dirt band layer that may be present, usually, injecting into well bushing pipe will connect as far as possible
The bottom of nearly subterranean coal, but coal seam of can not jumping out enters underlying stratum, when there is dirt band layer, be located above dirt band layer,
Now preferably there is about 1 meter of thick continuous coal seam between the internal lining pipe and dirt band layer, 15 lis are preferably less than without coal seam thickness
Rice, more preferably less than 10 centimetres.
According to this utility model, inject into well bushing pipe and withdrawal well internal lining pipe typically will be crossed each other in end, and
The section that crosses inject into well bushing pipe and withdrawal well internal lining pipe will perforate, be beneficial to produced by product gas by injecting into well bushing pipe
Finally removed into withdrawal well internal lining pipe and by withdrawal well.
In this case, for bushing pipe and withdrawal well internal lining pipe is injected into well, perforate segment length can be each only
It is on the spot the complete pipeline sections of 1-3, preferably 2, open pore size is generally 5-35mm, preferred 10-25mm, between the perforate typically interlocks
Every arrangement, and the perforate gross area can be 5-35%, the preferred 10-30% of perforate section tube wall area；In addition, wherein completely managing
Section meter is typically starting perforate apart from least 0.5 meter distant place of box cupling, to keep the intensity of whole pipeline section.
According to this utility model, wherein generally arrange in bushing pipe perforate section igniting positioning baffle injecting into well, ensureing
Under conditions of there is perforate internal lining pipe igniting positioning baffle both sides, preferably igniting positioning baffle is located at away from injecting into well bushing pipe end
At portion 1-2 complete pipeline section, finally positioned with auxiliary fuel bag, wherein the igniting positioning baffle can be welding baffle or contracting
Footpath clip, for preset igniting position and in running auxiliary fuel bag is finally positioned, and fuel bag is after positioning
The igniting positioning baffle is blocked, thus closure igniting forward position passage forces the oxidant stream of injection by injecting into well on bushing pipe
Perforate enter coal seam be used for light a fire.
In addition, as previously mentioned, ignition installation of the present utility model starts optionally at one from the equipment end
Or multiple fuel bag front ends are provided with the stopper for closure igniting forward position passage, when using igniting positioning baffle, the closure
Just it is used for blocking igniting positioning baffle with stopper, thus closure igniting forward position passage forces the oxidant stream of injection to pass through injection well
Perforate on internal lining pipe enters coal seam to be used to light a fire.
In addition, it is similar with the Underground Coal Gasification Process of prior art, drilling well punching is generally included when completion system is prepared
Wash and draining and be air-dried, wherein drilling well flushing and draining includes removing drilling cuttings and drilling fluid etc. and with pump freedom in well
Water is drained, and is air-dried and the residual water in well is carried secretly or purged out including being injected air and being vented from withdrawal well by injection well
Come, and be gradually forced into target operating pressure afterwards and inject air before igniting always to keep the circulation of well system and do
It is dry.
According to this utility model, in the coal underground gasification method, further can be lighted a fire as follows
And gasification：
Under conditions of injection air keeps the circulation of well system and is dried, start conveyer device by one or more fuel bags
It is transported at igniting positioning baffle and positions, fuel bag is used air as when conveyer device is integrated signal cable and pushes gas
Body；
Low discharge air is being injected (such as≤300Nm by oxidant channel3The air of/h) under conditions of, starting ignition is drawn
Letter starts ignite one or more fuel bags from equipment end with delayed mode, then starts and disconnects device to withdraw including conveying
Device in interior ignition installation part to as little as home, the home away from least 10 meters of ignition location, preferably
At least 20 meters；With
Monitors ignition position and the temperature of withdrawal well well head, gradually increase air stream injecting into well after bushing pipe starts melting
Amount (such as progressively increases to≤1,000Nm3/ h) until product gas constitute stable, gradually increase air mass flow afterwards again until output
Well wellhead temperature meets the requirements (for example reach predetermined value 120-150 DEG C), in the bar that output well plugging and/or oxygen leakage do not occur
Under part, start to inject oxidant and gasifying agent is gasified, if wherein fiber-optic signal feedback shows that ignition location temperature exceeds
Measurement range and fiber lengths shortening, then can determine that injecting into well bushing pipe starts melting.
In said method of the present utility model, for withdrawal well outlet temperature, oxidant i.e. air mass flow is generally basede on
Its heating rate is controlled less than 20 DEG C/h, preferably more than 15 DEG C/h and is finally stabilized it at 120-150 DEG C, so controlled
Withdrawal well outlet temperature be the pyrolysis product of the volatile matters and coal in order to ensure coal ground can be entrained to by product air-flow and not
Withdrawal well can be blocked after condensation, while well system integrity will not be destroyed, stop igniting if it there is output well plugging, and can
With based on the oxygen content monitoring oxygen leakage in product gas, when in product gas, oxygen content then can determine generation in explosion limit
Oxygen is leaked, and now should also stop igniting.
According to this utility model, in the coal underground gasification method, when high-purity more than 35vol% using oxygen concentration
Degree oxidant need to be while inject coolant, wherein can also be using injecting into well between bushing pipe and coal bed drilling when being gasified
Annular space injects gasifying agent, and the annular space is generally required before ignition uses inert gas purge.
According to this utility model, in the coal underground gasification method, in the unignited coal seam of ignition phase or gasified
In journey, coal seam generally requires in the case of interrupting and is lighted a fire again (include regnition and repeatedly igniting), now general to adopt
Coiled tubing fuel bag of reloading as conveyer device and convey is in place, and is injected by the use of coiled tubing as oxidant channel
Oxygen concentration for 35-50vol% oxidant to rekindle coal seam, here using coiled tubing be due to its operating flexibility and
More can ensure that mainly due to its height air-tightness and will not leak the oxidant.
According to this utility model, in the coal underground gasification method, if there is output well plugging in ignition phase
And/or oxygen leakage then stops igniting, now generally will determine whether coal seam lights, will be lighted a fire again if unignited.
Specifically, leak in the event of oxygen, now coal seam typically will not be lighted completely, it usually needs be lighted a fire again；If it happens
Output well plugging, such as the condensation such as coal tar causes output well plugging, then typically will first clear up tamper dredging withdrawal well, so
Confirm whether coal seam lights again afterwards, only need to increase oxidizer flow rate continuation igniting if ignited, if unignited
To light a fire again.For being lighted a fire in ignition phase again, wherein adopt oxygen concentration for the oxidant of 35-50vol% it is main
It is to inject into well bushing pipe to light new coal seam in order to ensure what is remained after can quickly burning previous igniting.
According to this utility model, in the coal underground gasification method, if coal seam occurs in gasification interrupted,
For example encounter thicker non-coal seam such as dirt band, tomography or fold etc., cause gasification to stop, will typically redefine coal seam position
Put and lighted a fire again, wherein adopt oxygen concentration can quickly light new for the oxidant primarily to guarantee of 35-50vol%
Coal seam.
Below with reference to the accompanying drawings further describe embodiment of the present utility model.
An embodiment of ignition installation of the present utility model is given in Fig. 1-2, wherein using coiled tubing or connecing
Pipe is closed as conveyer device.As shown in Figure 1-2, wherein coiled tubing or conjugation tube 12 pass through external grapples adapter 10 and non-return
Valve 9 is connected, and further Jing disconnections device 7 is connected to igniter fuse 6 and fuel bag 5.Distributed temperature, pressure and sound wave sensing
Device 8 is separately fixed at and injects into well outside bushing pipe and on coiled tubing outer wall.Thermite and diluent, point are included in fuel bag 5
Fiery fuse 6 extends through fuel bag (3 fuel bags are illustrated in Fig. 1), and is ignited first and its lie farthest away with delayed mode
Fuel bag and and then each fuel bag that ignites backward successively.Fuel coating discharges heat after igniting, by oxidant channel 11 (now for
Coiled tubing or conjugation tube 10 and inject into well the annular space between bushing pipe) injection low discharge air, the low discharge air carries
The heat is by injecting into well the perforate on bushing pipe 3 into the coal seam 1 in peripheral circular region and transferring heat to coal seam
1.Stopper 4 is provided with fuel bag leading section, the boot band injected into well in bushing pipe 3 is located at for the closure after fuel bag positioning
2 (undergauge clip is used as igniting positioning baffle simultaneously), such that it is able to force the low discharge air of injection by injecting into well bushing pipe
On perforate enter coal seam be used for light a fire.
Another embodiment of ignition installation of the present utility model is given in Fig. 3-4, wherein using integrated signal electricity
Cable is used as conveyer device.As shown in Figure 3-4, wherein integrated signal cable 21 is connected to disconnection in its end Jing cable connector 22
Device 7 and igniter fuse 6, which breaks 6 equal electricity consumption signal enabling of device 7 and igniter fuse.In Fig. 3 the setting of fuel bag 5 and
Function is identical with Fig. 1, disconnects device 7 and igniter fuse simply by the transmission signal of telecommunication control of integrated signal cable 21 and startup
6.In addition, integrated signal cable 21 must convey fuel bag 5 by the injection fuel bag push air of oxidant channel 11 reaching
Predetermined ignition position.Closure stopper 4 is provided with fuel bag front end and balance stopper 4, Er Qie is provided with fuel bag tail end
Pipeline righting circle 23 is cased with two stoppers, thus with inject into well bushing pipe inwall be in close contact realize airtight sealing, with
Maximize the motive force that fuel bag pushes air stream.
This utility model is not limited to embodiments described above, for a person skilled in the art, this practicality
New to have various change and adjustment, without departing from spirit of the present utility model and principle, the change and adjustment are equal
Should be in the range of this utility model.
Claims (11)
1. a kind of ignition installation for Underground Coal Gasification Process, wherein the ignition installation includes what is be linked in sequence each other
Conveyer device, disconnection device, igniter fuse and one or more fuel bags, plurality of fuel bag are one another in series, and wherein：
The conveyer device is coiled tubing, conjugation tube or integrated signal cable；
The igniter fuse extends through one or more fuel bags and for starting ignite one from equipment end with delayed mode
Individual or multiple fuel bags；
The disconnection device is disconnected after starting ignition fuse, is thus withdrawn including the ignition installation part including conveyer device extremely
As little as home；With
Thermite is included in the fuel bag and for lighting subterranean coal after being ignited, the thermite is aluminium powder and can be with
Generation thermit reaction metal-oxide granular mixture, the metal-oxide selected from iron sesquioxide, four oxidation
Three-iron, copper oxide, nickel sesquioxide, nickel oxide, vanadic anhydride, chromic oxide and manganese dioxide, wherein aluminium powder with it is described
The mixing ratio of metal-oxide is 0.5-2.0 times of thermit reaction stoichiometric proportion, and the consumption of wherein described thermite be enough to
The duration of ignition of 20 seconds to 10 minutes is provided.
2. ignition installation according to claim 1, wherein the metal-oxide in the fuel bag is selected from iron sesquioxide
And ferroso-ferric oxide, wherein 0.8-1.2 times for thermit reaction stoichiometric proportion of the mixing ratio of aluminium powder and the metal-oxide,
The consumption of wherein described thermite be enough to the duration of ignition for providing 30 seconds to 7 minutes.
3. ignition installation according to claim 1 and 2, wherein starting in one or more fuel bag front ends from equipment end
It is provided with and is provided with identical stopper for balance, the plug with multiple fuel bag tail ends for the stopper for blocking igniting forward position passage
The material of son is the metal of carbon steel or fusing point higher than aluminum.
4. ignition installation according to claim 1 and 2, wherein the shell of the fuel bag is with proper strength and energy
Enough by thermit reaction molten metal shell, on the shell of the fuel bag, optionally include not drilling through completely for some random distributions
Drilling so as to be conducive to discharge thermit reaction in issuable gas.
5. ignition installation according to claim 1 and 2, wherein in the fuel bag also comprising selected from solid fuel
Granular diluent, the consumption of the diluent are less than the 40wt% of diluent and aluminothermy agent composition, and wherein described aluminothermy
The grain graininess of agent and the diluent is each independently 200nm-5.0mm.
6. ignition installation according to claim 5, wherein the particulate diluent in the fuel bag selected from solid hydrocarbons and
Powdered carbon, the consumption of the diluent are less than the 25wt% of diluent and aluminothermy agent composition, and wherein described thermite and institute
The grain graininess for stating diluent is each independently 500nm-2.5mm.
7. ignition installation according to claim 1 and 2, wherein the conveyer device is coiled tubing or conjugation tube, wherein
The coiled tubing or conjugation tube are by external grapples adapter and other part effectively connections, the external grapples adapter reality
Existing non-solder connection and offer airtight sealing.
8. ignition installation according to claim 7, wherein the igniter fuse and disconnecting device each with pressure signal
Start, and one or more check-valves are also associated between the coiled tubing or conjugation tube and disconnection device, for preventing
Inverted draft enters the coiled tubing or conjugation tube.
9. ignition installation according to claim 3, wherein the conveyer device is integrated signal cable, the integrated signal
Cable by cable connector with disconnect device be connected, and be cased with one or more fuel incrustations pipeline righting circle with/
Or it is described for block igniting forward position passage stopper and if there is for balance stopper on be cased with pipeline righting circle.
10. ignition installation according to claim 9, wherein the igniter fuse and disconnecting device and opening each with the signal of telecommunication
Dynamic, the material of the pipeline righting circle is rubber.
11. ignition installations according to claim 10, the wherein material of pipeline righting circle are high density polyethylene (HDPE).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620934250.7U CN206053929U (en) | 2016-08-24 | 2016-08-24 | For the ignition installation of Underground Coal Gasification Process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620934250.7U CN206053929U (en) | 2016-08-24 | 2016-08-24 | For the ignition installation of Underground Coal Gasification Process |
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| CN201620934250.7U Withdrawn - After Issue CN206053929U (en) | 2016-08-24 | 2016-08-24 | For the ignition installation of Underground Coal Gasification Process |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106121619A (en) * | 2016-08-24 | 2016-11-16 | 中为(上海)能源技术有限公司 | Ignition installation and application thereof for Underground Coal Gasification Process |
| WO2018035734A1 (en) * | 2016-08-24 | 2018-03-01 | 中为(上海)能源技术有限公司 | Ignition device for underground coal gasification process, and applications thereof |
| CN109237513A (en) * | 2018-08-29 | 2019-01-18 | 西安石油大学 | A kind of depth well use multistage solid fuel igniter |
-
2016
- 2016-08-24 CN CN201620934250.7U patent/CN206053929U/en not_active Withdrawn - After Issue
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106121619A (en) * | 2016-08-24 | 2016-11-16 | 中为(上海)能源技术有限公司 | Ignition installation and application thereof for Underground Coal Gasification Process |
| WO2018035734A1 (en) * | 2016-08-24 | 2018-03-01 | 中为(上海)能源技术有限公司 | Ignition device for underground coal gasification process, and applications thereof |
| CN106121619B (en) * | 2016-08-24 | 2019-01-08 | 中为(上海)能源技术有限公司 | Ignition installation and its application for Underground Coal Gasification Process |
| US11021943B2 (en) | 2016-08-24 | 2021-06-01 | Zhongwei (Sha Ghai) Energy Technology Co. Ltd | Ignition device for underground coal gasification process, and applications thereof |
| CN109237513A (en) * | 2018-08-29 | 2019-01-18 | 西安石油大学 | A kind of depth well use multistage solid fuel igniter |
| CN109237513B (en) * | 2018-08-29 | 2024-01-26 | 西安石油大学 | Multistage solid fuel igniter for deep well |
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