CN106223925B - Auxiliary raw materials for production feed process for coal underground gasifying technology - Google Patents
Auxiliary raw materials for production feed process for coal underground gasifying technology Download PDFInfo
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- CN106223925B CN106223925B CN201610712795.8A CN201610712795A CN106223925B CN 106223925 B CN106223925 B CN 106223925B CN 201610712795 A CN201610712795 A CN 201610712795A CN 106223925 B CN106223925 B CN 106223925B
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP 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
Abstract
The present invention relates to one kind to assist raw materials for production feed process for coal underground gasifying technology (ISC), wherein a scheme is as follows: catalyst, reactant, additive and purging medium being delivered directly to high-temperature gasification area and combustion zone from the ground port the first transfer passage a by the first transfer passage a；The auxiliary raw materials for production for carrying injection secretly by water flow will be needed to be transported to high-temperature gasification area and combustion zone by the second port transfer passage a of the second transfer passage a；First transfer passage a is the circular passage injected into well between bushing pipe for injecting casing and concentric setting, second transfer passage a is the circular passage injected into well between bushing pipe and coiled tubing oxidant injection device, and the second transfer passage a is isolated completely until entering high-temperature gasification area and combustion zone with coal seam.Catalyst, purging medium and pre- thermal medium can be transported to reaction zone and humidity province different in underground gasification furnace by technique requirement by the feed process, realize the purpose for improving processing performance.
Description
Technical field
The present invention relates to a kind of methods of auxiliary raw materials for production charging, are used for underground coal gasification(UCG) more particularly to one kind
Technique (ISC) assists the feed process of raw materials for production charging.
Background technique
Underground coal gasification(UCG) (ISC) is one by oxidant, and burning and gasification reaction by subterranean coal are straight coal
Switch through the process for turning to product gas.Product gas is commonly known as synthesis gas, can be used as fuel production, Chemical Manufacture, power generation etc.
The raw material of downstream process.The technical process the set complete well of shaft building, underground coal mining and coal gasification process technology have safety
Well, the advantages that investing small, high efficiency, pollution less.
Coal gasification process is the process that coal is changed into synthesis gas by a series of chemical reaction.It is wherein main
Reaction includes:
C+H20 → H2+ CO(steam gasification reaction)
CO+H20 ↔ H2+CO2(water gas shift reaction)
CO+3H2↔ CH4+H20 (methanation reaction)
C+2H2 → CH4(hydrogen gasification reaction)
C+½O2→ CO (partial oxidation reaction)
C+O2 → CO2(complete oxidation)
C+CO2→ 2CO(carbon dioxide gasification reaction)
One drilling well for oxidant injection is known as " injection well ", another drilling well for being used to produce product gas is known as
" product well ".Directed drilling and vertical drilling all can be used as injection well or product well.Underground coal gasification(UCG) (ISC) may inject
It is also needed between well and product well using to one or more vertical well (such as: functional well and service well).
When having injection well, product well and horizontal channel to connect the two in coal seam, this construction is referred to as a coal
Charcoal underground gasification (ISC) unit or well pair.ISC unit includes combustion zone, gasification zone and pyrolysis zone.Wherein, combustion zone is in coal seam
Near middle oxidant decanting point；Gasification zone is centered around around combustion zone or in combustion zone downstream in the form of radial, and coal exists
Gasification zone is gasified, is partially oxidized, to generate product gas；Pyrolysis zone generally exists in gasification zone downstream, the pyrolytic reaction of coal
Here occur.The product gas of high temperature is finally transported to ground from product well well head from gasification zone toward downstream flow.In coal combustion
Or while gasification, the ISC burned out area in coal seam, which can be grown, to become larger.
Synthesis gas (CO, CO are usually contained by the product gas (crude synthesis gas) that underground coal gasification(UCG) generates2、H2、CH4And its
The mixture of his gas) and other compositions (solid particle, water, coal tar, hydrocarbon vapours, other microcomponents include H2S、
NH4, COS etc.).Its complicated component degree depend on many aspects: oxidant used in underground coal gasification(UCG) (air or other
Oxidant, such as oxygen, oxygen-enriched air or vapour mixture), the inherent water in coal seam or surrounding formations penetrate into water in coal seam,
The operating parameter of coal quality and coal underground gasifying technology, including temperature, pressure etc..
The main bottleneck of coal underground gasification technology the efficiency of gasification process and degradation and its is made in operational process
At unqualified synthesis gas product and equipment fault or damage.According to existing patent document, the particular technique faced at present is asked
Topic includes:
(1) synthesis gas yield caused by coal quality problem causes synthesis gas second-rate or girdle or high ash content is insufficient, most
The economic benefit of the low coal underground gasifying technology of final decline；
(2) acid compound (such as hydrochloric acid, sulfuric acid etc.) that sulphur and chlorine element are formed under reduction and wet environment in coal seam
Cause the corrosion to well integrality and ground installation；
(3) a large amount of tar and pitch cause the blocking of product well and surface duct.Stopping state usually occurs lighting a fire
After process or during underrun.When the temperature of well is lower or when surface duct environment temperature is lower than freezing point, blocks
Problem will be more acute；
(4) when remaining oxidizing agent in injection well soft air channel, coal seam is along soft air channel unexpected burning.Or
After remaining oxidizing agent in product well soft air channel and synthesis gas product mix, cause the accident of product well or upstream device
Fuel or explosion；
(5) product well preheating time is too long, and higher exhaust emissions amount and synthesis gas product is caused to be lost.
Summary of the invention
It is an object of the invention to solve the deficiencies in the prior art, provide a kind of for coal underground gasifying technology (ISC)
Assist raw materials for production feed process.It can be by catalyst, reactant, additive, purging medium and pre- heating agent by the feed process
It is situated between and is transported to reaction zone and humidity province different in underground gasification furnace (ISC well to) by technique requirements, realizes and optimize and improve it
The purpose of processing performance.
The technical solution adopted by the present invention to solve the technical problems is:
The present invention solves the first technical solution of its technical problem, assists raw materials for production for coal underground gasifying technology
Feed system, the orientation injection well based on underground coal gasification(UCG) unit, orientation injection well includes vertical section, segmental arc and level
Section, the feed system include such as lower component:
Injection casing and concentric setting inject into well bushing pipe, and injection casing includes vertical section and segmental arc, note
Entering well internal lining pipe includes vertical section, segmental arc and horizontal segment；
Injection casing and circular passage between bushing pipe is injected into well as the first transfer passage a, the first transfer passage a
Inside is equipped with underground instrumentation, injects into well and is equipped with coiled tubing oxidant injection device inside bushing pipe, injects into well bushing pipe
Circular passage between coiled tubing oxidant injection device be the second transfer passage a, the second transfer passage a completely and coal seam
Isolation is until enter high-temperature gasification area (this regional temperature is higher than 550 DEG C) and combustion zone, the second transfer passage a is for injecting gasification
Process water and the auxiliary raw materials for production for needing to carry secretly injection by water flow.
The feed process of the technical solution is as follows: by catalyst, reactant, additive and being blown by the first transfer passage a
It sweeps medium and is delivered directly to high-temperature gasification area and combustion zone from the ground port the first transfer passage a；Pass through the second transfer passage a's
Second port transfer passage a will need the auxiliary raw materials for production for carrying injection secretly by water flow to be transported to high-temperature gasification area and burning
Area.
Auxiliary raw materials for production can be effectively communicated to the high temperature reaction zone underground coal gasification(UCG) (ISC) (i.e. by the technical solution
High-temperature gasification area and combustion zone), wherein auxiliary raw materials for production include:
Reactant: solid hydrocarbon particulates (by crushing, grinding, screening), liquid hydrocarbon, gas are hydrocarbon
Compound or product water (low fouling, middle low-corrosiveness).
Catalyst: for improving gasification efficiency and synthesis gas quality, being produced for coal tar heavy duty rectification property and reduction coal tar
Powdered solid phase, liquid phase or the gas phase catalyst of rate.
Additive: for preventing or reducing corrosion and fouling in catalyst and reactant transmission process.
The mixture of catalyst, reactant and additive can be injected into simultaneously high temperature reaction zone by same transfer passage
Domain achievees the purpose that optimization and improves coal underground gasifying technology performance.
Purging medium such as nitrogen is injected into the first transfer passage a, it is ensured that the especially unexpected coal combustion region in the region
In inert gas shielding.Similarly, carbon dioxide, water or steam are injected into the first transfer passage a also to replace the area
To protect the coal seam of reaction zone rear end, (gasification reaction needs temperature to be higher than 550 to remaining oxidant in domainoC).
Auxiliary raw materials for production can be by injecting casing and injecting into well circular passage (the first transfer passage between bushing pipe
A vertical section) and injection well and the circular passage (the first transfer passage a horizontal segment) injected into well between bushing pipe be transported to underground gas
Change the high temperature reaction zone (> 550 of furnace (ISC well to)oC).
Assist raw materials for production can also be by injecting into well (the second transfer passage of the circular passage between bushing pipe and coiled tubing
A) it is transported to the high temperature reaction zone (> 550 of underground gasification furnace (ISC well to)oC).
The present invention solves second of technical solution of its technical problem, and the auxiliary for coal underground gasifying technology produces former
Expect that feed system, the vertical product well based on underground coal gasification(UCG) unit, the feed system include such as lower component: product pipe and
Product casing, circular passage between the two are the first transfer passage b, and product pipe includes that complete product pipe pipeline section and aperture produce
Quality control pipeline section, the first inside transfer passage b are equipped with underground instrumentation, and in vertical product bottom, product casing reaches coal
It is terminated at the top of layer vertical drilling, intersects with coal seam vertical drilling and be equipped with injection well aperture internal lining pipe, complete product pipe pipeline section terminates in
At the top of coal seam, aperture product pipe pipeline section is started from the top of coal seam, in the case where maximum heat stretches situation, product pipe and injection well aperture internal lining pipe
The distance between be greater than zero；
The feed system further includes the parallel water cooling tube by product pipe and in product casing, and water cooling tube is set
There are check-valves and nozzle, water cooling tube is until in the vertical drilling of coal seam, water cooling length of tube is more than aperture product pipe pipeline section end, water cooling
Pipe is as the second transfer passage b, for conveying the auxiliary raw materials for production for needing to carry injection secretly by water flow.
The feed process of the technical solution is as follows: driving ignition phase, will purge medium and pre- by the first transfer passage b
Thermal medium is delivered directly in the vertical drilling of coal seam from the ground port the first transfer passage b, passes through aperture product pipe pipeline section, preheating
Medium recycles between the first transfer passage b and product pipe, improves entire product well temperature；
Under normal operation, catalyst, reactant and additive are conveyed from ground first by the first transfer passage b
The channel port b is delivered directly in the vertical drilling of coal seam, will be needed by the second port transfer passage b of the second transfer passage b
It is transported in the vertical drilling of coal seam by the auxiliary raw materials for production of water flow entrainment injection, the auxiliary raw materials for production of all inputs all exist
Synthesis gas quenching area and crude synthesis gas come into full contact with and react in the vertical drilling of coal seam, later as crude synthesis gas stream is by opening
Hole product pipe pipeline section enters product pipe, and is entrained to floor outlet by crude synthesis gas stream.
In the technical solution, raw materials for production can will be assisted to be effectively communicated to underground coal gasification(UCG) by vertical product well
(ISC) cryogenic reaction zone, wherein auxiliary raw materials for production include:
Catalyst: for changing powdered solid phase, liquid phase or the gas phase catalyst of synthesis gas components.
Additive: for product well anti-corrosion, good antiscale property, anti-clogging and the close of coal tar and product water in pipeline can be reduced
The additive of degree, viscosity and freezing point.
The mixture of catalyst, reactant and additive can be injected into simultaneously cryogenic reaction zone by same transfer passage
Domain achievees the purpose that optimization and improves coal underground gasifying technology performance.
Purging medium such as nitrogen or carbon dioxide are injected into the first transfer passage b, it is ensured that the region is in inert gas
Non-explosive admixture of gas (synthesis gas and oxidant) in protection.
Pre- thermal medium such as air or nitrogen etc. shorten ignition process for preheating product casing before ignition process
To the transit time of normal course of operation.After the medium can be by ground heat-exchange device or heating devices heat, circulation injection
In product well.Alternatively, the hot synthesis gas that nearby running underground gasification furnace produces also can be used as pre- thermal medium and be injected into the production
Product well.
Auxiliary raw materials for production can be transported to underground gasification furnace by the circular passage between product casing and product pipe
The coal seam vertical drilling of (ISC well to), i.e. cryogenic reaction zone (< 350oC).
It vertically bores in the coal seam that auxiliary raw materials for production can also be delivered directly to underground gasification furnace (ISC well to) by water cooling tube
Hole, i.e. cryogenic reaction zone (< 350oC).
The third technical solution that the present invention solves its technical problem is as follows:
For the auxiliary raw materials for production feed system of coal underground gasifying technology, the orientation based on underground coal gasification(UCG) unit
Product well, confined goods well include vertical section, segmental arc and horizontal segment, and the feed system includes such as lower component:
Product casing and product pipe including concentric setting, circular passage between the two are the first transfer passage b,
It is equipped with underground instrumentation inside first transfer passage b, product casing and product pipe extend in the horizontal drilling of coal seam；
It further include the parallel water cooling tube by product pipe and in product casing, water cooling tube is equipped with check-valves and spray
Mouth, water cooling tube extend in the horizontal drilling of coal seam, and water cooling length of tube is more than complete product pipe pipeline section to aperture product pipe pipeline section, water
Cold pipe is as the second transfer passage b, for conveying the auxiliary raw materials for production for needing to carry injection secretly by water flow；
Product pipe vertical section and segmental arc are complete product pipe pipeline section, and product pipe horizontal segment is designed using aperture, if being equipped with
Dry gas hole forms aperture product pipe pipeline section, is equipped with synthesis gas deflector in aperture product pipe pipeline section.
The feed process of the technical solution are as follows: driving ignition phase will purge medium and preheating by the first transfer passage b
Medium is delivered directly in the horizontal drilling of coal seam from the ground port the first transfer passage b, passes through aperture product pipe pipeline section, pre- heating agent
Jie recycles between the first transfer passage b and product pipe, improves entire product well temperature；
Under normal operation, catalyst, reactant and additive are conveyed from ground first by the first transfer passage b
The channel port b is delivered directly in the horizontal drilling of coal seam；It will be needed by the second port transfer passage b of the second transfer passage b
By water flow entrainment injection auxiliary raw materials for production be transported in the horizontal drilling of coal seam, synthesis gas deflector force crude synthesis gas from
The tapping of aperture product pipe pipeline section enters in the circular passage between product casing and aperture product pipe, all inputs
Raw materials for production synthesis gas quenching area and crude synthesis gas all in the horizontal drilling of coal seam is assisted to come into full contact with and react, later with thick
Synthesis gas flow enters product pipe by aperture product pipe pipeline section, and is entrained to floor outlet by crude synthesis gas stream.
In the embodiment, raw materials for production will be assisted to be effectively communicated to underground coal gasification(UCG) by confined goods well
(ISC) low-temp reaction region, the program is using circular passage (the first conveying between product casing and complete product pipe pipeline section
Channel b vertical section) and product casing and aperture product pipe pipeline section between circular passage (the first transfer passage b horizontal segment)
The low-temp reaction region (< 350 that raw materials for production will be assisted to be transported to underground gasification furnace (ISC well to)oC).For confined goods well,
Auxiliary raw materials for production are maintained inside product casing horizontal segment, will not contact any coal seam.
The present invention solves the 4th kind of technical solution of its technical problem substantially with the third scheme, is a difference in that: aperture
Product pipe pipeline section is off-tube, can come into full contact with and react, water cooling length of tube with auxiliary raw materials for production disconnecting area's crude synthesis gas
More than complete product pipe pipeline section to the disconnecting unit of aperture product pipe pipeline section.
Detailed description of the invention
The structural schematic diagram of the first solution of Fig. 1 present invention；
The structural schematic diagram of Fig. 2 second of solution of the present invention；
The structural schematic diagram of the third solution of Fig. 3 present invention；
The structural schematic diagram of Fig. 4 the 4th kind of solution of the present invention.
1:1, the second port transfer passage a in figure, the 2, first port transfer passage a, 3, injection casing, 4, inject into well
Bushing pipe, 5, coiled tubing oxidant injection device, 6, underground instrumentation, the 7, first transfer passage a, the 8, second transfer passage a,
9, nozzle, 10, coal seam, 11, injection well coal seam horizontal drilling, 12, gasification zone, 13, combustion zone, 14, syngas outlet, 15,
One port transfer passage b, the 16, second port transfer passage b, 17, product casing, 18, product pipe, 19, water cooling tube, 20,
One transfer passage b, the 21, second transfer passage b, 22, aperture product pipe pipeline section, 23, check-valves, 24, nozzle, 25, synthesis gas it is rapid
Cold-zone, 26, crude synthesis gas, 27, injection well aperture internal lining pipe, 28 product well aperture internal lining pipes, 29, product well coal seam water flat drill
Hole, 30, deflector.
Specific embodiment
With reference to the accompanying drawing, technical solution of the present invention is further elaborated.
The invention discloses a kind of auxiliary raw materials for production feed process for being used for coal underground gasifying technology (ISC).Pass through
Catalyst, reactant, additive, purging medium and pre- thermal medium can be transported to underground gasification furnace by technique requirement by this method
Different reaction zone and humidity province in (ISC well to) realize optimization and improve the purpose of its processing performance.
It includes the complete well component of standard that can be bought in different suppliers that the system, which specifically describes,.Innovation of the invention it
Place, according to single component different characteristics and function, invented auxiliary raw materials for production for coal underground gasifying technology (ISC) into
Expect system and method, totally four kinds of technical solutions, specific such as embodiment 1-4 are illustrated the present invention.
Embodiment 1
As shown in Figure 1, assisting raw materials for production feed system for coal underground gasifying technology, it is based on underground coal gasification(UCG) list
The orientation injection well of member, orientation injection well include vertical section, segmental arc and horizontal segment, and the feed system includes such as lower component:
Injection casing 3 and concentric setting inject into well bushing pipe 4, and injection casing 3 includes vertical section and segmental arc,
Injecting into well bushing pipe 4 includes vertical section, segmental arc and horizontal segment；
Injection casing 3 and circular passage between bushing pipe 4 is injected into well as the first transfer passage a7, the first conveying is logical
It is equipped with underground instrumentation 6 inside road a7, injects into well and is equipped with coiled tubing oxidant injection device 5, injection well inside bushing pipe 4
Circular passage between internal lining pipe 4 and coiled tubing oxidant injection device 5 is the second transfer passage a8, the second transfer passage a8
Be isolated with coal seam completely until entering this regional temperature of high-temperature gasification area 12(higher than 550 DEG C) and combustion zone 13, the second conveying lead to
Road a8 is used to inject gasification process water and needs to carry secretly by water flow the auxiliary raw materials for production of injection.
The feed process of the technical solution is as follows: by catalyst, reactant, additive and being blown by the first transfer passage a7
It sweeps medium and is delivered directly to high-temperature gasification area 12 and combustion zone 13 from ground the first transfer passage port a2；It is logical by the second conveying
The second transfer passage port a1 of road a8 will need the auxiliary raw materials for production for carrying injection secretly by water flow to be transported to high-temperature gasification area
12 and combustion zone 13.
Auxiliary raw materials for production can be effectively communicated to the high temperature reaction zone underground coal gasification(UCG) (ISC) by the technical solution,
Middle auxiliary raw materials for production include:
Reactant: solid hydrocarbon particulates (by crushing, grinding, screening), liquid hydrocarbon, gas are hydrocarbon
Compound or product water (low fouling, middle low-corrosiveness).
Catalyst: for improving gasification efficiency and synthesis gas quality, being produced for coal tar heavy duty rectification property and reduction coal tar
Powdered solid phase, liquid phase or the gas phase catalyst of rate.
Additive: for preventing or reducing corrosion and fouling in catalyst and reactant transmission process.
The mixture of catalyst, reactant and additive can be injected into simultaneously high temperature reaction zone by same transfer passage
Domain achievees the purpose that optimization and improves coal underground gasifying technology performance.
Purging medium such as nitrogen is injected into the first transfer passage a7, it is ensured that the especially unexpected coal combustion region in the region
In inert gas shielding.Similarly, carbon dioxide, water or steam are injected into the first transfer passage a7 also to replace the area
To protect the coal seam of reaction zone rear end, (gasification reaction needs temperature to be higher than 550 to remaining oxidant in domainoC).
Auxiliary raw materials for production can (the first conveying be logical by injection casing 3 and the circular passage for injecting into well between bushing pipe 4
Road a7 vertical section) and injection well and inject into well circular passage (horizontal segment of the first transfer passage a7) between bushing pipe 4 and convey
To the high temperature reaction zone (> 550 of underground gasification furnace (ISC well to)oC).
Auxiliary raw materials for production can also be logical by injecting into well the annular between bushing pipe 4 and coiled tubing oxidant injection device
Road (the second transfer passage a8) is transported to the high temperature reaction zone (> 550 of underground gasification furnace (ISC well to)oC).
Embodiment 2
For the auxiliary raw materials for production feed system of coal underground gasifying technology, based on the vertical of underground coal gasification(UCG) unit
Product well, the feed system include such as lower component: product pipe 18 and product casing 17, and circular passage between the two is the
One transfer passage b20, product pipe 18 includes complete product pipe pipeline section and aperture product pipe pipeline section 22, in the first transfer passage b20
Portion is equipped with underground instrumentation 6, and in vertical product bottom, product casing 17 is reached and terminated at the top of the vertical drilling of coal seam, with
Vertical drilling intersection in coal seam is equipped with injection well aperture internal lining pipe 27, and complete product pipe pipeline section terminates at the top of coal seam, aperture product pipe
Pipeline section 22 starts from the top of coal seam, and in the case where maximum heat stretches situation, the distance between product pipe 18 and injection well aperture internal lining pipe 27 are big
In zero；
The feed system further includes parallel set on the water cooling tube 19 product pipe 18 side and be located in product casing 17, water
Cold pipe 19 is equipped with check-valves 23 and nozzle 24, and water cooling tube 19 is until in the vertical drilling of coal seam, water cooling tube 19 is defeated as second simultaneously
Channel b21 is sent, for conveying the auxiliary raw materials for production for needing to carry injection secretly by water flow.
The feed process of the technical solution is as follows: driving ignition phase, by the first transfer passage b20 by catalyst, anti-
Agent, additive and purging medium is answered to be delivered directly in the vertical drilling of coal seam from the ground port the first transfer passage b 15, by opening
Hole product pipe pipeline section 22, auxiliary raw materials for production recycle between the first transfer passage b20 and product pipe 18, improve entire product well
Temperature；
Under normal operation, by the first transfer passage b20 by catalyst, reactant, additive and purging medium from
Ground the first transfer passage b15 is delivered directly in the vertical drilling of coal seam, passes through the second transfer passage of the second transfer passage b21
The port b 16 will need by water flow carry secretly injection auxiliary raw materials for production is transported in the vertical drilling of coal seam, all inputs it is auxiliary
Help raw materials for production all in the vertical drilling of coal seam synthesis gas quenching area 25 and crude synthesis gas 26 come into full contact with and react, later with
26 air-flow of crude synthesis gas enters product pipe 18 by aperture product pipe pipeline section 22, and is entrained to ground by 26 air-flow of crude synthesis gas and goes out
Mouthful.
In the technical solution, raw materials for production can will be assisted to be effectively communicated to underground coal gasification(UCG) by vertical product well
(ISC) cryogenic reaction zone, wherein auxiliary raw materials for production include:
Catalyst: for changing powdered solid phase, liquid phase or the gas phase catalyst of synthesis gas components.
Additive: for product well anti-corrosion, good antiscale property, anti-clogging and the close of coal tar and product water in pipeline can be reduced
The additive of degree, viscosity and freezing point.
The mixture of catalyst, reactant and additive can be injected into simultaneously cryogenic reaction zone by same transfer passage
Domain achievees the purpose that optimization and improves coal underground gasifying technology performance.
Purging medium such as nitrogen or carbon dioxide are injected into the first transfer passage, it is ensured that the region is in inert gas guarantor
Non-explosive admixture of gas (synthesis gas and oxidant) in shield.
Pre- thermal medium such as air or nitrogen etc. shorten ignition process for preheating product casing before ignition process
To the transit time of normal course of operation.After the medium can be by ground heat-exchange device or heating devices heat, circulation injection
In product well.
Auxiliary raw materials for production can be transported to ground by the first transfer passage b20 between product casing 17 and product pipe 18
The coal seam vertical drilling of lower gasification furnace (ISC well to), i.e. cryogenic reaction zone (< 350oC).
Auxiliary raw materials for production can also be delivered directly to the coal of underground gasification furnace (ISC well to) by the second transfer passage b21
Layer vertical drilling, i.e. cryogenic reaction zone (< 350oC).
Embodiment 3
For the auxiliary raw materials for production feed system of coal underground gasifying technology, the orientation based on underground coal gasification(UCG) unit
Product well, confined goods well include vertical section, segmental arc and horizontal segment, and the feed system includes such as lower component:
Product casing 17 and product pipe 18 including concentric setting, circular passage between the two are that the first conveying is logical
It is equipped with underground instrumentation 6 inside road b20, the first transfer passage b20, product casing 17 and product pipe 18 extend to coal seam water
In flat drill hole；
It further include parallel set on the water cooling tube 19 product pipe 18 side and be located in product casing 17, water cooling tube 19 is equipped with only
Valve 23 and nozzle 24 are returned, water cooling tube 19 extends in the horizontal drilling of coal seam, and water cooling tube 19 is used as the second transfer passage b 21 simultaneously,
For conveying the auxiliary raw materials for production for needing to carry injection secretly by water flow；
18 vertical section of product pipe and segmental arc are complete product pipe pipeline section, and 18 horizontal segment of product pipe is designed using aperture, if
There are several stomatas, forms aperture product pipe pipeline section 22, be equipped with synthesis gas deflector 30 in aperture product pipe pipeline section 22.
The feed process of the technical solution are as follows: driving ignition phase, by the first transfer passage b20 by catalyst, reaction
Agent, additive and purging medium are delivered directly in the horizontal drilling of coal seam from the ground port the first transfer passage b 15, pass through aperture
Product pipe pipeline section 22, auxiliary raw materials for production recycle between the first transfer passage b20 and product pipe 18, improve entire product well temperature
Degree；
Under normal operation, by the first transfer passage b20 by catalyst, reactant, additive and purging medium from
The ground port the first transfer passage b 15 is delivered directly in the horizontal drilling of coal seam；Pass through the second transfer passage b21 of water cooling tube 19
The second port transfer passage b 16 will need by water flow carry secretly injection auxiliary raw materials for production be transported to coal seam horizontal drilling
Interior, synthesis gas deflector 27 forces crude synthesis gas to enter product casing 17 from the tapping of aperture product pipe pipeline section 22 and open
In circular passage between the product pipe pipeline section of hole, synthesis gas is rapid all in the horizontal drilling of coal seam for the auxiliary raw materials for production of all inputs
Cold-zone 25 and crude synthesis gas 26 come into full contact with and react, later with 26 air-flow of crude synthesis gas by aperture product pipe pipeline section 22 into
Enter product pipe 18, and floor outlet is entrained to by 26 air-flow of crude synthesis gas.
In the embodiment, raw materials for production will be assisted to be effectively communicated to underground coal gasification(UCG) by confined goods well
(ISC) low-temp reaction region, the program use circular passage and production between product casing 17 and complete product pipe pipeline section
Circular passage between product casing 17 and aperture product pipe pipeline section 22 will assist raw materials for production to be transported to underground gasification furnace (ISC
Well to) low-temp reaction region (< 350oC).For confined goods well, raw materials for production are assisted to be maintained at product casing 17 horizontal
Intersegmental part will not contact any coal seam.
Embodiment 4
Technical solution with the scheme of embodiment 3, is a difference in that substantially: aperture product pipe pipeline section 22 is off-tube, disconnected
Opening area's crude synthesis gas 26 can and assist raw materials for production to come into full contact with and react.
The reactant that high temperature reaction zone can be transported in the present invention by injection well includes following auxiliary raw materials for production: being passed through
It crushes, the biological particles of grinding, screening.Biological particles can be injected water by gasification and carry secretly and be transported to underground gasification
The high temperature reaction zone of furnace (ISC well to).The reaction zone is mobile to injection well direction over time.When biological particles and
When injection water is transported to high temperature reaction zone, injection water heat absorption becomes vapor.Biological particles are heated simultaneously, by devolatilization
Divide and becomes nascent coke after pyrolytic reaction.Later, coke is come into being 550oC to 1500oIn the section C and vapor and reaction zone
Other gaseous components occur gasification reaction:
Biomass → nascent coke+volatile matter
Nascent coke gasification:
C + ½O2 → CO
C + O2 → CO2
C + H2O → H2+CO
C + CO2 → 2CO
C + 2H2 → CH4
Using methane as the typical volatile hydrocarbons of representative point reaction:
CH4 + 2O2 → CO2 + 2H2O
CH4 + H2O ↔ CO + 3H2
Simultaneously, there is a large amount of simultaneous oxidations and reduction reactions in high temperature reaction zone.Biological particles warp
A large amount of ash content can be stayed in underground gasification furnace (ISC well to) burned out area by crossing after gasification reaction, and a small amount of grey branch is by product
Gas is entrained to ground and removes in surface separation device.The benefit of injection biological particles is effectively supplemented with nytron
Raw material improves yield in identical gasification furnace cost of investment, minimizes the increment of operating cost into underground gasification furnace,
Effectively improve the economic benefit of underground coal gasification(UCG) (ISC).Meanwhile the biomass for injecting high heating value can effectively improve synthesis
Makings amount reduces the coal tar oil yield of unit synthesis gas.
Similar with biological particles, coal dust also can be used as the height that a kind of reactant is transported to underground gasification furnace (ISC well to)
Warm reaction zone.
Coal tar is one of byproduct of coal underground gasifying technology.If local coal tar selling market is in bad order,
It can also be used as a kind of reactant and is transported in underground gasification furnace.When entering in high temperature reaction zone, coal tar heat absorption evaporation becomes
For gas phase.Later, synthesis gas is generated after thermal cracking, steam reformation and gasification.The complete coal tar oil ingredient of part unreacted
Be synthesized gas product be entrained to ground carry out separating treatment after be recycled be transported to underground gasification furnace reaction zone.
Product water, another byproduct of coal underground gasifying technology contain impurity such as dissolving salt, hydrocarbon, benzene
Phenol and other compounds.After entering high temperature reaction zone, all organic compounds all will burned and gasification in product water；Other
Inorganic compound generates salt after burning and is deposited in underground gasification furnace in remaining coal ash；Product water inner part unreacted
Complete component, which is synthesized gas product and is entrained to ground, be recycled after separating treatment being transported to underground gasification furnace pyroreaction
Area.Different from above-mentioned biomass, coal dust or coal tar, the key benefit for injecting product water is the note that can reduce gasification fresh water
Enter amount and reduces the expense of product water storage and processing.
It is suitable for injecting between the coal seam needs of reactant and its overlying rock and underlying stratum there are effective area of isolation,
It is existed only in coal seam with the reactant raw material and gasification reaction that ensure to inject.Oxygen is injected using continuous recycling gas injection point (CRIP)
The technique of agent, which can ensure that, can will be located at the reactant whole that flame rear does not react eventually by burning and gasification reaction
Consumption.The reactant of injection has to pass through high temperature reaction zone, can greatly promote its reactivity in this way, and it is incomplete to minimize its reaction
A possibility that.Meanwhile only when underground gasification furnace operates normally, (larger injection flow) conveys reactant, to guarantee to inject flow
Entrainment reactant enough prevents the blocking of well to high temperature reaction zone.In load down operation, abnormal running and short-term closed furnace process
In, need to stop reactant injecting and inject fresh water rinse the channel with keep its it is unimpeded reactionless dose deposition.
The catalyst that high temperature reaction zone can be transported in the present invention by injection well includes following auxiliary raw materials for production: water coal
Gas catalyst for water-gas shift reaction is naturally present in coal seam, especially in the minerals of coal (ash content).These catalyst are main
It is aluminum oxide (Al2O3) and di-iron trioxide (Fe2O3), the content in ash content is generally respectively 15-25wt% and 15-
35wt%(ash content main component silica is 30-50wt%).However the catalyst activity in ash content usually compares industrial catalyst
Activity it is much lower, mainly due to its active surface area is smaller, effective active component is less and coal seam in itself sulphur, mercury
And chloride poisoning.Therefore, the catalyst conversion efficiency based on ash content is very low and useful life is very short.Water gas shift reaction is
One reversible reaction:
CO +H2O ↔ CO2 +H2
If target is to reduce sulfide emission, these high-temperature water gas conversion catalysts can be added.Pass through
It reacts below, more gasifying agents (steam) can be generated in these catalyst while capturing sulphur:
Al2O3 + 3H2S → Al2S3 + 3H2O
Fe2O3 + 3H2S → 2FeS + 3H2O + S
Other catalyst with preferable sulphur removal (or sulfur poisoning) are Catalysts for Low-temperature Water-gas Shift Reactions:
ZnO + H2S → ZnS +H2O
CuO + H2S → CuS + H2O
Cobalt-molybdenum composite catalyst has preferable anti-sulfur poisonous performance.For example, having supported cobalt-molybdenum/aluminium oxide of potassium (k)
(Co-Mo/Al2O3) or cobalt-nickel/aluminium oxide (Co-Ni/Al2O3) catalyst shows higher Water gas shift/WGS activity.These
The active component of catalyst is in lower temperature (250-350oC just complete cure but same activity with higher under).
Catalyst for methanation in presence of sulfur, such as magnesium nisiloy hydrochlorate (MNS) catalyst are shown to H2S and NH3Higher tolerance
Property.The catalyst can pass through high-temperature steam and CO to methanation reaction activity with higher, MNS catalyst2Reform (700-
900oC) tar and light hydrocarbon are converted synthesis gas by process.
CO + 3H2 ↔ CH4 + H2O
CO2 + 4H2 ↔ CH4 +2H2O
In order to reduce catalyst (Al in ash content2O3And Fe2O3) to the activity of water gas shift reaction, it can be urged by injection
Agent toxicity includes sulfide (such as H2S), ammonia (such as NH3), sodium salt (such as NaCl) and chloride (such as HCl) inhibit or reduce
The catalytic activity of its ash content improves carbon monoxide yield.
The additive that high temperature reaction zone can be transported in the present invention by injection well includes following auxiliary raw materials for production: anti-corrosion
Inhibitor and pH neutralizer can convey together with the product water containing acid, chloride and phenols.When temperature is higher than 100oC, phenols
Show stronger corrosivity.This can occur injecting into well bushing pipe close to the position of oxidant decanting point.Due to horizontal liner
Pipe is consumptive in gasification furnace useful life, therefore the major function of anti-corrosion inhibitor is to ensure that in gasification furnace useful life
The integrality of injection well.
Good antiscale property additive can effectively prevent the fouling of injection distribution channel inner wall.Such as phosphonic acids alkali antisludging agent can be effective
Prevent carbonate and sulfate scale；Polymer matrix antisludging agent can effectively prevent barium, sulfate/carbonate fouling of strontium and calcium.
A kind of artificial synthesized amino acid of poly-aspartate, can be used as antisludging agent, corrosion inhibiter, dispersing agent, chelating agent and water absorbent.
Poly-aspartate is biodegradable and pollution-free since its is nontoxic, is most suitable underground coal gasification(UCG) (ISC) process.
Can include: by the purging medium that injection well conveys in the present invention
Nitrogen is injected into the first transfer passage a7, it is ensured that the especially unexpected coal combustion region in the region is in inertia
In gas shield.In draining drying process before the ignition event, while being passed through nitrogen and replacing residual air in the region.
Similarly, it is remaining in the region to replace also to be injected into the first transfer passage a7 for carbon dioxide, water or steam
Oxidant with protect reaction zone rear end coal seam (gasification reaction need temperature be higher than 550oC).
Casing 3 is injected in the present invention and injects into well the circular passage of bushing pipe 4 as the first transfer passage a7:
The first transfer passage a7 be positioned at injection 3 vertical section of casing inside (outer diameter 7 ", 7 ", 7 ", 8
", 9 ") with the circular passage that injects into well the outside of bushing pipe 4 (outer diameter 4 ", 5 ", 5 ", 5 ", 5 ", 6 ").
Since underground instrumentation 6(outer diameter is ", ", 1 ") it is mounted in the circular passage, cause its effective aisle spare to reduce.
Injection casing 3 terminates after bottom becomes horizontal direction from vertical direction.It crosses since the position to product well
Place, the first transfer passage a7 are inside the horizontal drilling of coal seam and to inject into well the circular passage outside bushing pipe 4.
Auxiliary raw materials for production can be transported in coal bed drilling by first transfer passage a7 and directly be contacted with coal seam.
Auxiliary raw materials for production can be delivered directly to high temperature reaction zone (coal seam temperature > 550 lateroC, ignition temperature may be up to 2000oC).By
It is directly contacted with coal seam in auxiliary raw materials for production, the additional materials preferably not reacted with coal seam under low temperature.
The circular passage between bushing pipe 4 and coiled tubing oxidant injection device 5 is injected into well in the present invention as second
Transfer passage a8, the second transfer passage a8 be located at inject into well the inside of bushing pipe 4 (injecting into well 4 outer diameter of bushing pipe is 4 ", 5 ",
5 ", 5 ", 5 ", 6 ") with 5 outside of coiled tubing oxidant injection device (outside coiled tubing oxidant injection device 5
Diameter is 2 ", 2 ", 2 ", 3 ", 4 ") circular passage.The second transfer passage a8 since well head vertical section to
Under extend to horizontal segment, until underground gasification furnace high temperature reaction zone.
The second transfer passage a8 is suitble to the auxiliary raw materials for production that should not directly contact with coal seam (as contained dissolving salt, carbon
The product water of hydrogen compound, phenol and other compound impurities).Auxiliary raw materials for production can be completely sealed in note by the channel
Enter in well internal lining pipe 4, until underground gasification furnace high temperature reaction zone.The additional materials will be directly burned after entering high temperature reaction zone
It is consumed with gasification reaction.It can be ensured by designing and controlling the minimum entrainment rate of liquid phase fluid in the channel in channel without solid
Phase impurity deposition.
The catalyst that cryogenic reaction zone can be transported in the present invention by product well includes following auxiliary raw materials for production: cobalt-
Molybdenum composite catalyst has preferable anti-sulfur poisonous performance.For example, having supported cobalt-molybdenum/aluminium oxide (Co-Mo/Al of potassium (k)2O3)
Or cobalt-nickel/aluminium oxide (Co-Ni/Al2O3) catalyst shows higher Water gas shift/WGS activity.The active group of these catalyst
Divide in lower temperature (250-350oC just complete cure but same activity with higher under).
Catalyst for methanation in presence of sulfur, such as magnesium nisiloy hydrochlorate (MNS) catalyst are shown to H2S and NH3Higher tolerance
Property.The catalyst can pass through high-temperature steam and CO to methanation reaction activity with higher, MNS catalyst2Reform (700-
900oC) tar and light hydrocarbon are converted synthesis gas by process.
CO + 3H2 ↔ CH4 + H2O
CO2 + 4H2 ↔ CH4 +2H2O
The additive that cryogenic reaction zone can be transported in the present invention by product well includes following auxiliary raw materials for production: anti-corrosion
Inhibitor and pH neutralizer can convey together with the product water containing acid, chloride and phenols.When temperature is higher than 100oC, phenols
Show stronger corrosivity.This can occur in the position close to cooling water decanting point.The major function of anti-corrosion inhibitor is true
Protect the integrality of product well in gasification furnace useful life.
Good antiscale property additive can effectively prevent the fouling of injection distribution channel inner wall.Such as phosphonic acids alkali antisludging agent can be effective
Prevent carbonate and sulfate scale；Polymer matrix antisludging agent can effectively prevent barium, sulfate/carbonate fouling of strontium and calcium.
A kind of artificial synthesized amino acid of poly-aspartate, can be used as antisludging agent, corrosion inhibiter, dispersing agent, chelating agent and water absorbent.
Poly-aspartate is biodegradable and pollution-free since its is nontoxic, is most suitable underground coal gasification(UCG) (ISC) process.
Alcohols can reduce the product water of well head output and the freezing point of coal tar such as methanol.When environment temperature is lower than production
When the freezing point of product water and coal tar, it can be used for preventing it from condensing in surface duct.Meanwhile methanol can also reduce product well
The density and viscosity of interior coal tar prevents product well plugging.
Nitrogen is injected into the first transfer passage b20, it is ensured that the region is in inert gas shielding, non-explosive gas
Mixture (synthesis gas and oxidant).In draining drying process before the ignition event, while being passed through nitrogen and replacing the region
Interior residual air.Product well purging only needs to carry out during entirely descending gasifier operation primary.Later, in the region meeting
Since migrating for a small amount of synthesis gas to form the mixture of synthesis gas and nitrogen.
Pre- thermal medium shortens ignition process to normal course of operation for preheating product casing 17 before ignition process
Transit time.After the medium can be by ground heat-exchange device or heating devices heat, circulation injection product well.Air or nitrogen
Gas can be used as pre- thermal medium.Nearby the hot synthesis gas of running underground gasification furnace production also can be used as pre- thermal medium and be injected into this
Product well.Similarly, steam can also be used for the channel, for maintaining the temperature of product well in load down operational mode.
The first transfer passage b20 between vertical product casing 17 and product pipe 18 of the invention as transfer passage,
The transfer passage is located at 17 inside (outer diameter 7 ", 7 ", 8 ", 9 ", 9 ", 9 ", 10 ") of product casing
With the circular passage of 18 outside (outer diameter 4 ", 4 ", 5 ", 5 ", 5 ", 5 ") of product pipe.Due to water cooling tube 19(outer diameter
For 1 " 1 ", 216", 2 ") and underground instrumentation 6(outer diameter be ", ", 1 ") be mounted in the circular passage,
Effective aisle spare can be reduced.Auxiliary raw materials for production can be transported to coal seam vertical drilling and and coal by the transfer passage
Layer directly contacts.
First transfer passage b20 of confined goods casing 17 and product pipe 18 of the invention is as transfer passage: this is defeated
Channel is sent to be located at 17 inside (outer diameter 7 ", 7 ", 8 ", 9 ", 9 ", 9 ", 10 ") of product casing and produce
The circular passage of 18 outside (outer diameter 4 ", 4 ", 5 ", 5 ", 5 ", 5 ") of quality control.Since water cooling tube 19(outer diameter is 1
¼”. 1½”, 2⅟16", 2 ") and underground instrumentation 6(outer diameter be ", ", 1 ") be mounted in the circular passage, have
Effect aisle spare can be reduced.Product casing 17 is since ground to bottom from vertically becoming horizontal.Aperture product
Pipe pipeline section 22 is extended to since horizontal position in the horizontal drilling of coal seam.Aperture product pipe pipeline section 22 can be selected with synthesis
The continuous pipe or off-tube of conductance flowing plate 30.Auxiliary raw materials for production can be transported to horizontal set by first transfer passage b20
In pipe, discord coal seam is directly contacted.
Water cooling tube 19 of the invention is used as the second transfer passage b21 simultaneously: it is (outer that the transfer passage is located at 19 inside of water cooling tube
Diameter is 1 ", 1 ", 216", 2 "), end includes check-valves 23 and nozzle 24.
For vertical product well, water cooling tube 19 will be more than 22 end of aperture product pipe pipeline section, raw materials for production can will be assisted straight
It connects and is transported in the vertical drilling of coal seam and coal seam contact.
For confined goods well, water cooling tube 19 will be more than complete product pipe pipeline section, be located at aperture product pipe pipeline section 22 or its
Auxiliary raw materials for production can be delivered directly in horizontal case, directly contact with crude synthesis gas 26 by gap.
" embodiment " mentioned above is included in correlation properties, structure described in embodiment, feature
It is all related to wherein at least one embodiment of the invention.Therefore, described above repeatedly to refer to " in an embodiment "
Not all refer in particular to the same embodiment in place.In addition, the correlation properties described in embodiments, structure, feature can be with
The combination of any suitable way one or more, the foregoing is merely the preferred embodiments of the invention, is not used to limit
The system present invention.For those skilled in the art, the present invention can have various change and change.It is all in spirit and original of the invention
Within then, any modification, equivalent substitution, improvement and etc. done be should all be included in the protection scope of the present invention.
Claims (3)
1. the feed process for coal underground gasifying technology auxiliary raw materials for production, which is characterized in that the feed process is as follows:
Driving ignition phase will purge medium and pre- thermal medium from the ground port the first transfer passage b by the first transfer passage b
Be delivered directly in the vertical drilling of coal seam, by aperture product pipe pipeline section, pre- thermal medium the first transfer passage b and product pipe it
Between recycle, improve entire product well temperature；
Under normal operation, by the first transfer passage b by catalyst, reactant and additive from the first transfer passage of ground
The port b is delivered directly in the vertical drilling of coal seam, is passed through needs by the second port transfer passage b of the second transfer passage b
The auxiliary raw materials for production of water flow entrainment injection are transported in the vertical drilling of coal seam, and the auxiliary raw materials for production of all inputs are all in coal seam
Synthesis gas quenching area and crude synthesis gas come into full contact with and react in vertical drilling, are produced later with crude synthesis gas stream by aperture
Quality control pipeline section enters product pipe, and is entrained to floor outlet by crude synthesis gas stream；
Circular passage of the first transfer passage b between product pipe and product casing, product pipe include complete product pipe
Pipeline section and aperture product pipe pipeline section,
Second transfer passage b is the parallel water cooling tube by product pipe and in product casing, and water cooling tube is equipped with non-return
Valve and nozzle, water cooling tube is until in the vertical drilling of coal seam, water cooling length of tube is more than aperture product pipe pipeline section end.
2. the feed process for coal underground gasifying technology auxiliary raw materials for production, which is characterized in that the feed process is as follows:
Driving ignition phase will purge medium and pre- thermal medium from the ground port the first transfer passage b by the first transfer passage b
Be delivered directly in the horizontal drilling of coal seam, by aperture product pipe pipeline section, pre- thermal medium the first transfer passage b and product pipe it
Between recycle, improve entire product well temperature；
Under normal operation, by the first transfer passage b by catalyst, reactant and additive from the first transfer passage of ground
The port b is delivered directly in the horizontal drilling of coal seam；Needs are passed through by the second port transfer passage b of the second transfer passage b
The auxiliary raw materials for production of water flow entrainment injection are transported in the horizontal drilling of coal seam, and synthesis gas deflector forces crude synthesis gas from aperture
The tapping of product pipe pipeline section enters in the circular passage between product casing and aperture product pipe, the auxiliary of all inputs
Raw materials for production synthesis gas quenching area and crude synthesis gas all in the horizontal drilling of coal seam come into full contact with and react, later with thick synthesis
Gas air-flow enters product pipe by aperture product pipe pipeline section, and is entrained to floor outlet by crude synthesis gas stream；
First transfer passage b be concentric setting product casing and product pipe between circular passage, product casing and
Product pipe extends in the horizontal drilling of coal seam, and product pipe includes complete product pipe pipeline section and aperture product pipe pipeline section, aperture product
Synthesis gas deflector is equipped in pipe pipeline section；
Second transfer passage b is the parallel water cooling tube by product pipe and in product casing, and water cooling tube is equipped with non-return
Valve and nozzle, water cooling tube extend in the horizontal drilling of coal seam, and water cooling length of tube is more than complete product pipe pipeline section to aperture product pipe
Pipeline section.
3. the feed process for the auxiliary raw materials for production of coal underground gasifying technology, feature exist according to claim 2
In: the aperture product pipe pipeline section is off-tube, can come into full contact with and react with auxiliary raw materials for production disconnecting area's crude synthesis gas,
Water cooling length of tube is more than disconnecting unit of the complete product pipe pipeline section to aperture product pipe pipeline section.
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| CN113338934B (en) * | 2021-07-07 | 2023-12-08 | 中国矿业大学 | Deep coal fluidization exploitation in-situ gasification device |
| CN115355786B (en) * | 2022-08-26 | 2024-03-08 | 中国矿业大学 | Method for eliminating CO product by high-efficiency catalytic oxidation blasting |
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| CN101113671B (en) * | 2007-09-04 | 2011-05-11 | 新奥科技发展有限公司 | Underground catalytic gasification process of coal |
| CN201381844Y (en) * | 2009-03-09 | 2010-01-13 | 李文军 | Catalyzing device for increasing underground coal gasification gas quality |
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