CN106150471A - Dock gasification furnace and operational approach for coal underground gasifying technology - Google Patents
Dock gasification furnace and operational approach for coal underground gasifying technology Download PDFInfo
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- 238000002309 gasification Methods 0.000 title claims abstract description 193
- 239000003245 coal Substances 0.000 title claims abstract description 101
- 238000005516 engineering process Methods 0.000 title claims abstract description 22
- 239000000178 monomer Substances 0.000 claims abstract description 60
- 230000015572 biosynthetic process Effects 0.000 claims abstract description 55
- 238000003786 synthesis reaction Methods 0.000 claims abstract description 51
- 238000005553 drilling Methods 0.000 claims abstract description 36
- 238000002347 injection Methods 0.000 claims abstract description 22
- 239000007924 injection Substances 0.000 claims abstract description 22
- 239000007800 oxidant agent Substances 0.000 claims abstract description 7
- 230000001590 oxidative effect Effects 0.000 claims abstract description 6
- 238000000034 method Methods 0.000 claims description 80
- 239000007789 gas Substances 0.000 claims description 74
- 241000209094 Oryza Species 0.000 claims description 42
- 235000007164 Oryza sativa Nutrition 0.000 claims description 42
- 235000009566 rice Nutrition 0.000 claims description 42
- 238000010276 construction Methods 0.000 claims description 18
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 12
- 229910052760 oxygen Inorganic materials 0.000 claims description 12
- 239000001301 oxygen Substances 0.000 claims description 12
- 230000002950 deficient Effects 0.000 claims description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 8
- 238000011143 downstream manufacturing Methods 0.000 claims description 6
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 claims description 5
- 230000007613 environmental effect Effects 0.000 claims description 5
- 238000009776 industrial production Methods 0.000 claims description 5
- 238000010304 firing Methods 0.000 claims description 3
- 238000005065 mining Methods 0.000 claims description 2
- 238000009434 installation Methods 0.000 abstract description 2
- 238000004519 manufacturing process Methods 0.000 description 10
- 230000000903 blocking effect Effects 0.000 description 5
- 238000002485 combustion reaction Methods 0.000 description 5
- 239000011435 rock Substances 0.000 description 5
- 239000004568 cement Substances 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 239000003795 chemical substances by application Substances 0.000 description 3
- 238000005755 formation reaction Methods 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 2
- 238000000605 extraction Methods 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 238000005070 sampling Methods 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 239000011269 tar Substances 0.000 description 2
- 241000208340 Araliaceae Species 0.000 description 1
- FGUUSXIOTUKUDN-IBGZPJMESA-N C1(=CC=CC=C1)N1C2=C(NC([C@H](C1)NC=1OC(=NN=1)C1=CC=CC=C1)=O)C=CC=C2 Chemical compound C1(=CC=CC=C1)N1C2=C(NC([C@H](C1)NC=1OC(=NN=1)C1=CC=CC=C1)=O)C=CC=C2 FGUUSXIOTUKUDN-IBGZPJMESA-N 0.000 description 1
- 229910000975 Carbon steel Inorganic materials 0.000 description 1
- 235000005035 Panax pseudoginseng ssp. pseudoginseng Nutrition 0.000 description 1
- 235000003140 Panax quinquefolius Nutrition 0.000 description 1
- 244000208734 Pisonia aculeata Species 0.000 description 1
- 239000010962 carbon steel Substances 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 239000003610 charcoal Substances 0.000 description 1
- 239000011280 coal tar Substances 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000001730 gamma-ray spectroscopy Methods 0.000 description 1
- 235000008434 ginseng Nutrition 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000000197 pyrolysis Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/295—Gasification of minerals, e.g. for producing mixtures of combustible gases
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Gasification And Melting Of Waste (AREA)
- Vertical, Hearth, Or Arc Furnaces (AREA)
Abstract
The invention discloses a kind of underground gasification furnace for coal underground gasifying technology, including at least one dock gasification furnace monomer, described dock gasification furnace monomer includes following assembly: two orientations inject wells, and each orientation injects that well includes injecting casing, concentric is arranged injects into well bushing pipe and Uuderground Supervision System；The oxidant injection device that be fitted with coiled tubing in the internal lining pipe of orientation injection well, can pull back and underground ignition installation；One confined goods well, the product pipe arranged including confined goods casing, concentric and underground prison system table, product pipe end is open-celled structure, is provided with the internal lining pipe of omnidistance perforate in confined goods well horizontal channel；Two orientation injection wells and a confined goods well intersect each other through at tail end, and confined goods well well head is provided with synthesis gas on-line period and analyzes system and control system.Present configuration is simple, can inject the vertical section structure of well again with the discarded dock gasification furnace of shut-in well, reduce drilling cost.
Description
Technical field
The invention discloses a kind of underground gasification furnace for coal underground gasifying technology and operational approach.
Background technology
Underground coal gasification(UCG) (ISC) is a kind of by the controlled burning (imperfect combustion) of subterranean coal and gasified reverse
Should, coal is converted into the technical process of gas products.Product gas is commonly called synthesis gas, can as fuel production,
The raw material of the downstream process such as Chemical Manufacture, generating.This technical process set shaft building completion, underground coal mining and coal gasifying process skill
Art, the advantage such as have that safety is good, it is little to invest, high efficiency, pollution are few.
Leading directly to coal seam by ground drilling, oxygen supply agent is injected and the output of product gas provides effective passage.One is used for
The drilling well that oxidant injects is referred to as " injection well ", and another one is referred to as " product well " for the drilling well producing product gas.Orientation water
Flat drill well and vertical drilling all can be as injecting well or product well.
When having injection well, product well and horizontal channel the two to be coupled together in coal seam, this structure is referred to as a coal
Charcoal underground gasification (ISC) unit or well pair.ISC unit includes combustion zone, gasification zone and pyrolysis zone.Raw by underground coal gasification(UCG)
The product gas (crude synthesis gas) become usually contains synthesis gas (CO, CO2,H2,CH4Deng) and other impurity components (solid particle,
Water, coal tar, H2S,NH4, COS etc.).Crude synthesis gas is delivered to ground by through product well, then is transported to downstream by surface line
Device processes and applies.
The type selecting of underground gasification furnace needs to consider the geology in coal seam and hydrogeologic condition and downstream process is involutory
Become the requirement etc. of makings amount.Type of furnace design includes the drilling technology used in building process, the position of well pair and purposes etc..Existing
The various gasification type of furnaces generally only account for the most large-area " lamellar/bulk " exploitation, and have ignored practical operation
During the synthesis gas stability that causes due to complex geological condition and gasification, technology controlling and process, ground or subsurface formations sink
Degradation problem.Such as, the Chinese invention patent application book of Publication No. CN104594873A discloses a kind of underground coal gasification(UCG)
Stove and gasification process.This gasification furnace includes, the injection channel of an Approaching Coal Seam base plate, an Approaching Coal Seam top board outlet passageway
With a vertical point gas well.Employing peupendicular hole is lighted a fire, bottom export through top, coal seam after carrying out combustion gasification.It is main
Technical disadvantages is, the high temperature of described outlet passageway directly acts on roof, easily causes the wind of roof deformation, inbreak
Danger.When its carry out extensive stove group exploit time, use in well after igniting, draw by implementing to fall back in the second gasification unit
Fire, more multiple gasification furnaces of the first gasification unit in parallel.Lighting up procedure assists, and the time is longer, and whole system needs parallel operation, certain
One gasification furnace occurs that emergency case cannot find in time and process.The Chinese invention patent application book of publication number CN105089604A
Disclose a kind of underground coal gasification furnace and gasification process.This gasification furnace include a peupendicular hole (product well) and multiple mutually
The structure of the directed drilling composition being parallel to each other on the vertical plane.Use gasification step from the bottom to top that whole high seam is carried out
Gasification.Its major technique, disadvantageously, the method operation controls extremely difficult, easily produces spring layer through, damages whole gasification
Stove layout.Using the heat preheating coal seam, upper strata of lower floor's combustion gasification, pre-thermogenetic tar easily blocks horizontal channel and hangs down
The connected entrance of straight well, meanwhile, warm is wayward, the support that temperature is too high or overlong time is easily damaged in passage, makes
Become the problem such as cave in of upper channel.In sum, existing underground gasification furnace technology and gasification process become affects coal
One of bottleneck of efficiency of under ground gasification and stability.The subject matter faced at present includes:
(1) in coal seam, the location of carrying out horizontal directed drilling determines direction mainly by gamma-spectrometry instrument at present.Gamma
Measuring instrument can judge its drilling well position by the decay rank in top board, base plate and coal seam, then for distinguishing in coal seam
There is bigger difficulty in different drilling well positions.Therefore, the existing gasification type of furnace (two or more is mutually parallel to each other on the vertical plane
Directed drilling structure) improve drilling well difficulty and cost largely, affect heavy industrialization project implementation；
(2) use to lower and on gasification process have several defect.First, easily spring layer in underlying seam gasification,
Especially superjacent passage is laid out good and is in an area of low pressure, or there is air/oxidizer；Second, use bottom
The heat preheating superjacent of coal seam gasification, the tar that the superjacent of warm produces easily blocks horizontal channel and product
Product gas exit normal well, laid out support or other subsurface equipment in being also easily damaged passage simultaneously；3rd, if coal seam contains
The water yield is higher, is easily deposited on underlying seam passage, to igniting and gasifying process to control to cause extreme difficulties；4th, coal seam is certainly
The intensity of body is typically low many than strength of roof, when lower floor coal seam being implemented underground gasification the bigger burned out area of formation, and top
Easily collapse due to deadweight and block the gasification tunnel of underlying seam in coal seam；5th, need to terminate in underlying seam gasification, closed furnace, people
Work could implement superjacent gasification after filling, and when whole superjacent channel design is built up many already.When drilling channel is long
Between vacant, the blocking of superjacent channel design easily occurs, destroys, cave in, the problem such as coal seam oxidation.
(3) whole gasified boiler system relies primarily on only one peupendicular hole outlet passageway, blocking and current limliting easily occurs
Problem.Secondly as product well is different with the working environment injecting well, its indoor design and layout also have bigger difference.If
Another injection well of simple employing, as alternate channel, is easily destroyed its integrity, causes product gas leakage or subsoil water seepage
Etc. problem.
(4) sharing an outlet passageway due to whole system, gasification just cannot independently monitor each injection well after starting
Often running.Once run into down-hole emergency case, it is impossible to finding in time and appropriate process, whole gasified boiler system will be unable to continue
Continuous normal operating is bigger to coal resources waste.
(5) after gasification terminates, owing to whole system shares an outlet passageway, it is impossible to properly implement stopping of follow-up gasification furnace
, there is bigger environmental protection hidden danger in car, flame-out, cleaning and recovery operation.
Summary of the invention
An object of the present invention is to solve the deficiencies in the prior art, it is provided that a kind of for coal underground gasifying technology
Underground gasification furnace.
The two of the purpose of the present invention are to provide the operation side of a kind of underground gasification furnace for coal underground gasifying technology
Method.
The technical solution adopted for the present invention to solve the technical problems is:
For the dock gasification furnace of coal underground gasifying technology, including at least one dock gasification furnace monomer, described
Dock gasification furnace monomer includes following assembly:
Two orientation inject wells, each orientation inject well include inject casing, concentric arrange inject into well lining
Pipe and Uuderground Supervision System；
The oxidant injection device that be fitted with coiled tubing in the internal lining pipe of orientation injection well, can pull back and ground down-firing
Equipment；
One confined goods well, the product pipe arranged including confined goods casing, concentric and underground prison system table, produce
QC end is open-celled structure, is provided with the internal lining pipe of omnidistance perforate in confined goods well horizontal channel；
Two orientations are injected wells and a confined goods well and are intersected each other at tail end through, confined goods well location in centre,
Two orientations are injected well and are laid respectively at confined goods well both sides；
Confined goods well well head is provided with synthesis gas on-line period and analyzes system and control system.
Preferably, two orientation injection wells and a non-crossing through portion of confined goods well be arranged in parallel, and orientation is injected
Parallel distance between well and confined goods well is 10-30 rice.
Preferably, dock gasification furnace includes at least two dock gasification furnace monomer, adjacent dock gasification furnace monomer
The parallel distance that the orientation of homonymy is injected between well is 20-40 rice, and wherein 10-30 rice is the width of prearranged pillar, it is ensured that each
Dock gasification furnace monomer is airtight independent operating unit, and each dock gasification furnace monomer is online according to the synthesis gas of self
Sampling analytical system and control system independently operate and guarantee that the synthesis gas of continuous-stable produces.
When the emergency case such as blocking, flame-out, oxygen leakage occurs in some dock gasification furnace monomer, it is positioned at this dock
The Uuderground Supervision System of gasification furnace monomer and well head synthesis gas on-line period are analyzed system and can be found in time and feed back, be conducive to and
Time tackle this dock gasification furnace monomer of process independently, minimize various potential safety hazard, it is ensured that underground gasification stability and can
By property.
When finding above-mentioned emergency case, standby processing scheme is, Temporarily Closed one side positioning injects well, fixed according to one side
Judge emergency location to the condition of production injecting well and process.
After gasification terminates, the orientation of different aspects new dock gasification furnace monomer injects well and confined goods well can distinguish profit
The orientation using a discarded dock gasification furnace monomer of aspect shut-in well injects well and confined goods well vertical section structure, reduces drilling well
Cost.
For high seam gasification, use step from top to down, successively gasify, the maximum resource rate of extraction.
The present invention according to above-mentioned dock gasification furnace monomer, carries out extensive for general thickness coal seam (thickness < 20 meters)
The layout of industrialized production and underground gasification method, including:
A) according to project construction scale, determine A phase project dock gasification furnace number of monomers n, be followed successively by A1,
A2 ... An, according to the parallelism structural layout of dock gasification furnace monomer.Same dock gasification furnace monomer orientation inject well with
Parallel distance between confined goods well is 10-30 rice, adjacent dock gasification furnace monomer orientation inject between well parallel away from
From for 20-40 rice (including the prearranged pillar 10-30 rice between dock gasification furnace monomer)；
B) in A1 gasification furnace, inject in well horizontal channel in two orientations with confined goods well distalmost end intersection
Implement igniting simultaneously.Defective tail gas is incorporated to ground exhaust pipe, is transported to flare discharge；
C), after lighting a fire successfully, air, oxygen-enriched or pure oxygen gasification process are switched to according to technological requirement.Synthesis gas quality meets
After design standard, it is incorporated to ground synthesis gas pipeline, is transported to purified synthesis gas and processes and downstream syngas comprehensive utilization process；
D) successively to A2, A3 ... An carries out lighting a fire and technique switches to normally produce.Defective tail gas is incorporated to ground tail
Feed channel, is transported to flare discharge.Qualified synthesis gas product is incorporated to ground synthesis gas pipeline, be transported to purified synthesis gas process and
Downstream syngas comprehensive utilization process；
E) consume close to time complete when A term area coal seam, start B phase drilling well, igniting, gasification at new work surface.
Wherein, in B phase process of construction, the dock gasification furnace position of B phase, be same relative to the dock gasification furnace position of A phase
One plane entirety is along the distance (10-30 rice) being perpendicular to one prearranged pillar of vertical gasification direction skew.Final burned out area is
Interlock and be intervally arranged, the support force of maximizing prearranged pillar.Afterwards, step a)-d is repeated), it is ensured that downstream process continuously steady
Fixed operation；
F) reach normally to produce when the B phase, at the end of the A phase gasifies, successively to A1, A2 ... An carries out stopping, stopping working, clearly
Wash and restore.After water quality in burned out area reaches relevant environmental regulations requirement, A phase gasification furnace is carried out shut-in well process.Herein, institute
Well is had to use cement shut-in well from bottom to ground；
G) consume close to time complete when B term area coal seam, repeat step a)-f), beginning C phase, D phase gasify until by whole
Coal seam consumes.
The present invention solves in another embodiment of its technical problem, according to above-mentioned dock gasification furnace, for super thick
Coal seam (thickness > 20 meters) carries out layout and the underground gasification method of large-scale industrial production, including:
If a) coal seam being divided into dried layer, can be according to non-texture of coal in every layer thickness the thickest 15-20 rice and/or run of mine coal seam
(such as dirt band, false top etc.) position divides；
B) according to project construction scale, A phase project gasification furnace number n is determined, at L1 layer (the superiors) according to above-mentioned general
Logical thickness coal layer underground gasifying furnace layout and method implement above-mentioned general thickness coal seam gasification step a)-g), whole L1 layer is disappeared
Consumption.When stating general thickness coal seam gasification step f on the implementation, all wells use cement shut-in well from bottom to overlying rock,
Wherein, need to determine the need for implementing artificial caving or hand-stuff before shut-in well according to actual geological conditions；
C) consume close to time complete when L1 layer Final Issue regional coal-seam, start the drilling well at A phase L2 layer, light a fire, gasify
Process, when gasification furnace is built, utilizes existing A phase L1 layer orientation to inject well and the vertical section of confined goods well, starts A phase L2 layer
Drilling well and gasification furnace construction, in drilling process, the burned out area of available A phase L1 layer, artificial caving district or hand-stuff district are location
Border, it is ensured that the accuracy of Directional Drilling and reliability, in process of construction, the gasification furnace position of L2 layer is relative to the gasification furnace of L1 layer
Position, needs the distance (10-30 rice) of one prearranged pillar of overall offset, and final burned out area is at vertical (different layers) and horizontal plane
(identical layer) is all staggered being intervally arranged, the support force of maximizing prearranged pillar；
D) at the end of L1 layer Final Issue gasifies, above-mentioned general thickness coal seam gasification step a)-g is repeated), by whole L2
Layer consumes；
E) step a)-d it is repeated in from top to bottom according to the subregion of step a)), whole coal seam is consumed.
Accompanying drawing explanation
Fig. 1 is dock coal underground gasifying furnace list stove generalized section；
Fig. 2 is general thickness coal seam dock coal underground gasifying furnace group's schematic layout pattern；
Fig. 3 is ultra-thick coal bed dock coal underground gasifying furnace group's schematic layout pattern.
In figure: 1, inject well, 2, product well, 3, overlying rock, 4, coal seam.
Detailed description of the invention
In order to make the present invention more be easily understood, it is simple to practical operation, the detailed description of the invention of one or more first-selections will ginseng
According to accompanying drawing, it is described the most by way of example.
For the dock gasification furnace of coal underground gasifying technology, including at least one dock gasification furnace monomer, described
Dock gasification furnace monomer includes following assembly:
Two orientation inject wells, each orientation inject well include inject casing, concentric arrange inject into well lining
Pipe and Uuderground Supervision System；
The oxidant injection device that be fitted with coiled tubing in the internal lining pipe of orientation injection well, can pull back and ground down-firing
Equipment；
One confined goods well, the product pipe arranged including confined goods casing, concentric and underground prison system table, produce
QC end is open-celled structure, is provided with the internal lining pipe of omnidistance perforate in confined goods well horizontal channel；
Two orientations are injected wells and a confined goods well and are intersected each other at tail end through, confined goods well location in centre,
Two orientations are injected well and are laid respectively at confined goods well both sides；
Confined goods well well head is provided with synthesis gas on-line period and analyzes system and control system.
Preferably, two orientation injection wells and a non-crossing through portion of confined goods well be arranged in parallel, and orientation is injected
Parallel distance between well and confined goods well is 10-30 rice.
Preferably, dock gasification furnace includes at least two dock gasification furnace monomer, adjacent dock gasification furnace monomer
The parallel distance that the orientation of homonymy is injected between well is 20-40 rice, and wherein 10-30 rice is the width of prearranged pillar, it is ensured that each
Dock gasification furnace monomer is airtight independent operating unit, and each dock gasification furnace monomer is online according to the synthesis gas of self
Sampling analytical system and control system independently operate and guarantee that the synthesis gas of continuous-stable produces.
When the emergency case such as blocking, flame-out, oxygen leakage occurs in some dock gasification furnace monomer, it is positioned at this dock
The Uuderground Supervision System of gasification furnace monomer and well head synthesis gas on-line period are analyzed system and can be found in time and feed back, be conducive to and
Time tackle this dock gasification furnace monomer of process independently, minimize various potential safety hazard, it is ensured that underground gasification stability and can
By property.
When finding above-mentioned emergency case, standby processing scheme is, Temporarily Closed one side positioning injects well, fixed according to one side
Judge emergency location to the condition of production injecting well and process.
After gasification terminates, the orientation of different aspects new dock gasification furnace monomer injects well and confined goods well can distinguish profit
The orientation using a discarded dock gasification furnace monomer of aspect shut-in well injects well and confined goods well vertical section structure, reduces drilling well
Cost.
For high seam gasification, use step from top to down, successively gasify, the maximum resource rate of extraction.
Orientation inject well horizontal channel length in coal seam up to 500-1500 rice, preferably 800-1200 rice.Orientation note
Enter well and include that the orientation injecting casing, concentric is arranged injects into well bushing pipe, is arranged on and injects into well bushing pipe internal lining pipe outer wall
Uuderground Supervision System.Wherein inject casing to start from ground to extend to the position that bottom is parallel with seat earth
Put.Injecting into well bushing pipe and select complete pipe, be consumable goods, its material can be selected for ordinary carbon steel pipe, seamless steel pipe, engages steel pipe
Deng.Inject into well bushing pipe and select open-celled structure from ignition location to its top (with product well intersection).The aperture of perforate is 5-
35mm, perforate accounts for the 5-35% of tube wall area with staggered interval mode layout, the perforate gross area.Uuderground Supervision System includes temperature
Degree, pressure and sonic sensor, extend to its top along injecting into well outside bushing pipe.
The oxidant injection device that be provided with coiled tubing in injecting into well bushing pipe, can pull back and underground ignition installation, use
In subterranean coal igniting, normal production requisite oxygen agent and the injection of gasifying agent and the control of gasifying process process, it is ensured that high
The steady production of quality synthesis gas.
Confined goods well, including product casing, the product pipe of concentric setting, Uuderground Supervision System table.Wherein orient
In product well, freely-suspended product pipe terminal horizontal position is open-celled structure, and the internal lining pipe in confined goods well horizontal channel is
Omnidistance open-celled structure, the aperture of perforate is 5-35mm, and perforate accounts for tube wall area with staggered interval mode layout, the perforate gross area
5-35%.
Synthesis gas on-line period is analyzed system and is arranged on product well exit, monitors single gasification furnace synthesis gas for independent
Quality and oxygen content, and feed back to control system and security system in time, it is ensured that the safety of whole gasifying process, stability and
Reliability.
According to geology conditional decision, the prearranged pillar between dock gasification furnace monomer is 10-30 rice, to guarantee each gas
Change between stove monomer mutually isolated, for independent operating unit.The internal burned out area in final coal seam is preferably staggered to be intervally arranged, can be maximum
Change the support force of prearranged pillar.
Dock gasification furnace monomer burned out area width is controlled, operates pressure, coal seam thickness, gas with specific reference to gasification furnace monomer
Changing stove heat transference efficiency, coal seam and the resistance to compression stretching resistance of overlying rock thereof, the factor such as the stability of synthesis gas quality determines.Typically
Situation is 2-6 times of coal seam thickness, about 20-80 rice, preferably 30-60 rice.
The parallel distance that same dock gasification furnace monomer orientation is injected between well and confined goods well is 10-30 rice, phase
The parallel distance that adjacent dock gasification furnace orientation is injected between well is that 20-40 rice (includes the prearranged pillar between gasification furnace monomer
10-30 rice).
In first embodiment of the present invention, dock gasification furnace monomer is as it is shown in figure 1, dock gasification furnace monomer is by two
Individual orientation injects well 1 and a confined goods well 2 forms.Use directed drilling and completion technique to run through overlying strata in precalculated position
Layer 3, in coal seam 4 and extend forward 500-1500 rice, builds confined goods well 2 also completion.Place in confined goods well 2 end
Signal projector guides and injects well directed drilling.Start to inject well orientation at confined goods well 2 well head two lateral extent 10-30 rice
Drilling well, runs through in overlying rock 3 to coal seam 4 and extends forward 500-1500 rice, guaranteeing itself and confined goods well 2 in drilling process
Parallel.Signal projector according to confined goods well 2 end guides so that two orientations inject well 1 with confined goods well 2 at end
Portion intersects and the most through.Inject well horizontal segment end (i.e. tail end intersection) in orientation and implement igniting simultaneously, after lighting a fire successfully,
Air, oxygen-enriched or pure oxygen gasification process is switched to according to technological requirement.When synthesis gas quality is less than after design standard or burned out area
After width reaches design requirement, note oxygen equipment is implemented pullback operation, by combustion zone and gasification at two injection well well heads simultaneously
District moves to fresh coal seam, produces high-quality synthesis gas.When some gasification furnace occurs that blocking, flame-out, oxygen leakage etc. are prominent
Oestrusing condition, the Uuderground Supervision System and the well head synthesis gas on-line period that are positioned at gasification furnace are analyzed system and can be found in time and process.
Meanwhile, well can be injected by Temporarily Closed one side positioning, judge emergency location according to the unilateral condition of production and process.
Another embodiment of the invention, as in figure 2 it is shown, use this dock gasification furnace monomer to general thickness coal seam
(thickness < 20 meters) carries out layout and the operational approach of large-scale industrial production.Specific implementation method is as follows: first, according to item
Mesh production scale, determines A phase project gasification furnace number n, according to the parallelism structural layout of dock underground gasification furnace.Same gas
The parallel distance changed between stove injection well and product well is 10-30 rice, and the parallel distance that adjacent gasification stove injects between well is 20-
40 meters (including the prearranged pillar 10-30 rice between gasification furnace)；Second, in A1 gasification furnace, with product well distalmost end phase
Implement igniting in two injection well horizontal channels at friendship simultaneously.Defective tail gas is incorporated to ground exhaust pipe, is transported to torch
Discharge；3rd, after lighting a fire successfully, switch to air, oxygen-enriched or pure oxygen gasification process according to technological requirement.Synthesis gas quality meets
After design standard, it is incorporated to ground synthesis gas pipeline, is transported to purified synthesis gas and processes and downstream syngas comprehensive utilization process；The
Four, successively to A2, A3 ... An carries out lighting a fire and technique switches to normally produce.Defective tail gas is incorporated to ground exhaust pipe,
It is transported to flare discharge.Qualified synthesis gas product is incorporated to ground synthesis gas pipeline, is transported to purified synthesis gas and processes and downstream conjunction
Become gas comprehensive utilization process；5th, when A term area coal seam consumes close to time complete, start B phase drilling well, point at new work surface
Fire, gasification.Wherein, in B phase process of construction, the gasification furnace position of B phase, be same relative to the gasification furnace position of A phase
One plane entirety is along the distance (10-30 rice) being perpendicular to one prearranged pillar of gasification furnace direction skew.Final burned out area is staggered
It is intervally arranged, the support force of maximizing prearranged pillar.Afterwards, step one is repeated to four, it is ensured that the continuous-stable of downstream process
Run；6th, reach normally to produce when the B phase, at the end of the A phase gasifies, successively to A1, A2 ... An carries out stopping, stopping working, clearly
Wash and restore.After water quality in burned out area reaches relevant environmental regulations requirement, A phase gasification furnace is carried out shut-in well process.Herein, institute
Well is had to use cement shut-in well from bottom to ground；7th, when B term area coal seam consumes close to time complete, repeat step one
To six, beginning C phase, D phase gasify until being consumed in whole coal seam.
Another embodiment of the invention, as it is shown on figure 3, use this dock gasification furnace to ultra-thick coal bed (thickness > 20
Rice) carry out layout and the operational approach of large-scale industrial production.Specific implementation method is as follows: first, if being divided in coal seam
Dried layer, can divide according to non-texture of coal in every layer thickness the thickest 15-20 rice and/or run of mine coal seam (such as dirt band, false top etc.) position；The
Two, according to project construction scale, determine A phase project gasification furnace number n, at L1 layer (the superiors) according to above-mentioned general thickness coal
Layer underground gasification furnace layout and method (Fig. 2) implement above-mentioned general thickness coal seam gasification step one to seven, are consumed by whole L1 layer.
When stating general thickness coal seam gasification step 6 on the implementation, all wells use cement shut-in well from bottom to overlying rock.Its
In, need to determine the need for implementing artificial caving or hand-stuff before shut-in well according to actual geological conditions；3rd, when L1 layer
A rear term area coal seam consumes close to time complete, starts the drilling well at A phase L2 layer, igniting, gasification.When gasification furnace is built,
Utilize existing A phase L1 layer to inject well and the vertical section of product well, start drilling well and the gasification furnace construction of A phase L2 layer.Drilling process
In the burned out area of available A phase L1 layer, artificial caving district or hand-stuff district are border, location, it is ensured that the accuracy of Directional Drilling and
Reliability.In process of construction, the gasification furnace position of L2 layer, relative to the gasification furnace position of L1 layer, needs one reserved coal of overall offset
The distance (10-30 rice) of post.Final burned out area is all staggered being intervally arranged at vertical (different layers) and horizontal plane (identical layer),
The support force of maximizing prearranged pillar；4th, at the end of L1 layer Final Issue gasifies, repeat above-mentioned general thickness coal bed gas
Whole L2 layer, to seven, is consumed by change step one；5th, it is repeated in this method from top to bottom according to the subregion of this method step one
Whole coal seam, to four, is consumed by step one.
In sum, the dock gasification furnace of the present invention has the advantage that 1. simple in construction, and new dock gasification furnace orients
Inject well and can inject the vertical section structure of well again with the discarded dock gasification furnace of shut-in well, reduce drilling cost；The most effectively
Extend dock gasification furnace length, extend the life-span of dock gasification furnace, improve the economic benefit of project；3. dock gas
Change stove burned out area width controlled, implement longwell/banding exploitation, minimize the possibility of the problems such as roof inbreak or formation subsidence
Property；The most each dock gasification furnace monomer is airtight separate unit, individually operates and controls, any one dock
The normal production of dock gasification furnace group is not affected, it is ensured that safety that synthesis gas produces, steady when gasification furnace monomer goes wrong
Qualitative and seriality；The ignition process of the most each dock gasification furnace monomer can be implemented step by step, significantly reduces ignition phase not
The discharge capacity of qualified tail gas；6. burned out area simple in construction, without dead angle, the parking after terminating of gasifying, flame-out, cleaning and recovery operation
Can implement step by step, safe and simple.
" embodiment " mentioned above is included in the correlation properties described in embodiment, structure, feature
All relevant at least one of which embodiment of the present invention.Therefore, the above repeatedly mentions " in an embodiment "
Same embodiment is the most all refered in particular in place.Additionally, the correlation properties described in embodiments, structure, feature can be with
Any one or more combination of suitable mode.
The foregoing is only the preferred embodiments of the invention, be not limited to the present invention.For this area
Technical staff, the present invention can have various change and change.All within the spirit and principles in the present invention, that is done any repaiies
Change, equivalent, improvement etc., should be included within the scope of the present invention.
Claims (10)
1. for the dock gasification furnace of coal underground gasifying technology, including at least one dock gasification furnace monomer, its feature
It is: described dock gasification furnace monomer includes following assembly:
Two orientation inject wells, each orientation inject well all include inject casing, concentric arrange inject into well bushing pipe and
Uuderground Supervision System；
Oxidant injection device and the ground down-firing that be mounted on coiled tubing in the internal lining pipe of orientation injection well, can pull back set
Standby；
One confined goods well, including confined goods casing, the product pipe of concentric setting, Uuderground Supervision System, product pipe
End is open-celled structure, is provided with the internal lining pipe of omnidistance perforate in confined goods well horizontal channel；
Two orientations are injected wells and a confined goods well and are intersected each other at tail end through, confined goods well location in centre, two
Orientation is injected well and is laid respectively at confined goods well both sides；
Confined goods well well head is provided with synthesis gas on-line period and analyzes system and control system.
The most according to claim 1 for the dock gasification furnace of coal underground gasifying technology, it is characterised in that: two orientations
Inject well and a non-crossing through portion of confined goods well to be arranged in parallel, parallel between orientation injection well and confined goods well
Distance is 10-30 rice.
The most according to claim 1 for the dock gasification furnace of coal underground gasifying technology, it is characterised in that: include at least
Two dock gasification furnace monomers, the parallel distance that the orientation of adjacent dock gasification furnace monomer homonymy is injected between well is 20-
40 meters, wherein 10-30 rice is the width of prearranged pillar, it is ensured that the independence operation that each dock gasification furnace monomer is airtight is single
Unit, each dock gasification furnace monomer analyzes system according to the synthesis gas on-line period of self and control system independently operates and guarantees
The synthesis gas of continuous-stable produces.
Dock gasification furnace for coal underground gasifying technology the most according to claim 1, it is characterised in that: orientation note
Enter well and product well a length of 500-1500 rice.
Dock gasification furnace for coal underground gasifying technology the most according to claim 4, it is characterised in that: orientation note
Enter well and product well a length of 800-1200 rice.
Dock gasification furnace for coal underground gasifying technology the most according to claim 1, it is characterised in that: dock
The burned out area width range of gasification furnace monomer is at 20-80 rice.
Dock gasification furnace for coal underground gasifying technology the most according to claim 6, it is characterised in that: dock
The burned out area width range of gasification furnace monomer is at 30-60 rice.
Dock gasification furnace for coal underground gasifying technology the most according to claim 3, it is characterised in that: reserved coal
Post is intervally arranged for staggered, to maximize the prearranged pillar support force to whole mining area, it is to avoid formation subsidence or surface subsidence
Problem.
9. an operational approach for the dock gasification furnace for coal underground gasifying technology described in claim 1, its feature
It is: based on the general thickness coal seam within thickness 20 meters, carry out layout and the underground gasification method of large-scale industrial production
As follows:
A) according to project construction scale, determine A phase project dock gasification furnace number of monomers n, be followed successively by A1, A2 ... An,
According to the parallelism structural layout of dock underground gasification furnace monomer, same dock gasification furnace monomer orientation injects well and directional produced
Parallel distance between product well is 10-30 rice, and the parallel distance that adjacent dock gasification furnace monomer orientation is injected between well is 20-
40 meters；
B) in A1 gasification furnace, in two orientations with confined goods well distalmost end intersection inject well horizontal channel simultaneously
Implementing igniting, defective tail gas is incorporated to ground exhaust pipe, is transported to flare discharge；
C) after lighting a fire successfully, switching to air, oxygen-enriched or pure oxygen gasification process according to technological requirement, synthesis gas quality meets design
After standard, it is incorporated to ground synthesis gas pipeline, is transported to purified synthesis gas and processes and downstream syngas comprehensive utilization process；
D) successively to A2, A3 ... An carries out lighting a fire and technique switches to normally produce.Defective tail gas is incorporated to ground offgas duct
Road, is transported to flare discharge, and qualified synthesis gas product is incorporated to ground synthesis gas pipeline, is transported to purified synthesis gas and processes and downstream
Synthesis gas comprehensive utilization process；
E) consume close to time complete when A term area coal seam, start B phase drilling well, igniting, gasification at new work surface, wherein,
In B phase process of construction, the dock gasification furnace position of B phase, be at same plane relative to the dock gasification furnace position of A phase
Overall edge is perpendicular to the prearranged pillar distance of one 10-30 rice of vertical gasification direction skew, and burned out area is intervally arranged for staggered,
To maximize the support force of prearranged pillar, afterwards, repeat step a)-d), it is ensured that the continuous and steady operation of downstream process；
F) reach normally to produce when the B phase, at the end of the A phase gasifies, successively to A1, A2 ... An carries out stopping, stop working, clean and
Restore, after water quality in burned out area reaches relevant environmental regulations requirement, A phase gasification furnace is carried out shut-in well process；
G) consume close to time complete when B term area coal seam, repeat step a)-f), beginning C phase, D phase gasify until by whole coal seam
Consume.
10. an operational approach for the dock gasification furnace for coal underground gasifying technology described in claim 1, its feature
Being, based on the thickness ultra-thick coal bed more than 20 meters, the layout and the underground gasification method that carry out large-scale industrial production are as follows:
If a) coal seam being divided into dried layer, draw according to texture of coal position non-in every layer thickness the thickest 15-20 rice and/or run of mine coal seam
Point；
B) according to project construction scale, determining A phase project gasification furnace number n, the L1 layer in the superiors is grasped by the following method
Make, whole L1 layer consumed:
B1) according to project construction scale, determine A phase project dock gasification furnace number of monomers n, be followed successively by A1, A2 ...
An, according to the parallelism structural layout of dock underground gasification furnace monomer, same dock gasification furnace monomer orientation injects well with fixed
Parallel distance between product well is 10-30 rice, and adjacent dock gasification furnace monomer orientation injects the parallel distance between well
For 20-40 rice；
B2) in A1 gasification furnace, same in injecting well horizontal channel with two orientations of confined goods well distalmost end intersection
Time implement igniting, defective tail gas is incorporated to ground exhaust pipe, is transported to flare discharge；
B3) after lighting a fire successfully, switching to air, oxygen-enriched or pure oxygen gasification process according to technological requirement, synthesis gas quality meets and sets
After meter standard, it is incorporated to ground synthesis gas pipeline, is transported to purified synthesis gas and processes and downstream syngas comprehensive utilization process；
B4) successively to A2, A3 ... An carries out lighting a fire and technique switches to normally produce.Defective tail gas is incorporated to ground tail gas
Pipeline, is transported to flare discharge, and qualified synthesis gas product is incorporated to ground synthesis gas pipeline, be transported to purified synthesis gas process and under
Trip synthesis gas comprehensive utilization process；
B5) consume close to time complete when A term area coal seam, start B phase drilling well, igniting, gasification at new work surface, its
In, in B phase process of construction, the dock gasification furnace position of B phase, be same relative to the dock gasification furnace position of A phase
Plane entirety offsets the prearranged pillar distance of a 10-30 rice along being perpendicular to vertical gasification direction, and burned out area is staggered interval
Arrangement, to maximize the support force of prearranged pillar, afterwards, repeats step b1)-b5), it is ensured that the continuous-stable fortune of downstream process
OK；
B6) reach normally to produce when the B phase, at the end of the A phase gasifies, successively to A1, A2 ... An carries out stopping, stop working, clean and
Restore, after water quality in burned out area reaches relevant environmental regulations requirement, A phase gasification furnace is carried out shut-in well process；
B7) consume close to time complete when B term area coal seam, repeat step b1)-b6), beginning C phase, D phase gasify until by whole
L1 layer consumes coal seam and consumes；
C) consume close to time complete when L1 layer Final Issue regional coal-seam, start the drilling well at A phase L2 layer, light a fire, gasification,
When gasification furnace is built, utilize existing A phase L1 layer orientation to inject well and the vertical section of confined goods well, start the drilling well of A phase L2 layer
And gasification furnace construction, drilling process utilizes the burned out area of A phase L1 floor, artificial caving district or hand-stuff district for location border,
Guaranteeing accuracy and the reliability of Directional Drilling, in process of construction, the dock gasification furnace monomer sites of L2 layer is relative to L1 layer
The prearranged pillar distance of dock gasification furnace one 10-30 rice of monomer sites overall offset, final burned out area hanging down at different layers
Face the horizontal plane with identical layer directly to be intervally arranged in staggered, to maximize the support force of prearranged pillar；
D) at the end of L1 layer Final Issue gasifies, repeat the above steps b1)-b7), until whole L2 layer is consumed；
E) step a)-d it is repeated in from top to bottom according to the subregion of step a)), whole coal seam is consumed.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107939370A (en) * | 2017-12-11 | 2018-04-20 | 山东科技大学 | A kind of strip-type underground coal gasification system and production method |
| CN110159245A (en) * | 2019-07-05 | 2019-08-23 | 山东科技大学 | Distribution note exhaust passage narrow strips coal underground gasifying furnace production system and method |
| CN112761612A (en) * | 2021-01-07 | 2021-05-07 | 中国煤炭地质总局勘查研究总院 | Method for underground coal gasification by using waste coal bed gas well |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1673487A (en) * | 2005-04-05 | 2005-09-28 | 大雁煤业有限责任公司 | Underground gasification furnace operating state monitoring system |
| RU2316649C1 (en) * | 2006-08-21 | 2008-02-10 | Дальневосточный государственный технический университет | Underground gasification method |
| CN103742121A (en) * | 2014-01-14 | 2014-04-23 | 新奥气化采煤有限公司 | Underground gasification gas injection device and method |
| CN104024569A (en) * | 2011-12-21 | 2014-09-03 | 领潮能源有限公司 | Underground coal gasification well liner |
| CN104712305A (en) * | 2015-02-04 | 2015-06-17 | 新奥气化采煤有限公司 | Underground gasifier and gasifying method |
| CN104747160A (en) * | 2015-02-04 | 2015-07-01 | 新奥气化采煤有限公司 | Underground gasification furnace and method of coal |
| CN205990906U (en) * | 2016-08-28 | 2017-03-01 | 中为(上海)能源技术有限公司 | Dock gasification furnace for coal underground gasifying technology |
-
2016
- 2016-08-28 CN CN201610743799.2A patent/CN106150471B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1673487A (en) * | 2005-04-05 | 2005-09-28 | 大雁煤业有限责任公司 | Underground gasification furnace operating state monitoring system |
| RU2316649C1 (en) * | 2006-08-21 | 2008-02-10 | Дальневосточный государственный технический университет | Underground gasification method |
| CN104024569A (en) * | 2011-12-21 | 2014-09-03 | 领潮能源有限公司 | Underground coal gasification well liner |
| CN103742121A (en) * | 2014-01-14 | 2014-04-23 | 新奥气化采煤有限公司 | Underground gasification gas injection device and method |
| CN104712305A (en) * | 2015-02-04 | 2015-06-17 | 新奥气化采煤有限公司 | Underground gasifier and gasifying method |
| CN104747160A (en) * | 2015-02-04 | 2015-07-01 | 新奥气化采煤有限公司 | Underground gasification furnace and method of coal |
| CN205990906U (en) * | 2016-08-28 | 2017-03-01 | 中为(上海)能源技术有限公司 | Dock gasification furnace for coal underground gasifying technology |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107939370A (en) * | 2017-12-11 | 2018-04-20 | 山东科技大学 | A kind of strip-type underground coal gasification system and production method |
| CN110159245A (en) * | 2019-07-05 | 2019-08-23 | 山东科技大学 | Distribution note exhaust passage narrow strips coal underground gasifying furnace production system and method |
| CN112761612A (en) * | 2021-01-07 | 2021-05-07 | 中国煤炭地质总局勘查研究总院 | Method for underground coal gasification by using waste coal bed gas well |
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