CN104675376B - Underground gasification method and underground gasification system - Google Patents
Underground gasification method and underground gasification system Download PDFInfo
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- CN104675376B CN104675376B CN201510094964.1A CN201510094964A CN104675376B CN 104675376 B CN104675376 B CN 104675376B CN 201510094964 A CN201510094964 A CN 201510094964A CN 104675376 B CN104675376 B CN 104675376B
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- 238000002309 gasification Methods 0.000 title claims abstract description 196
- 238000000034 method Methods 0.000 title claims abstract description 32
- 239000007789 gas Substances 0.000 claims abstract description 285
- 239000000571 coke Substances 0.000 claims abstract description 164
- 239000003245 coal Substances 0.000 claims abstract description 62
- 238000002485 combustion reaction Methods 0.000 claims abstract description 49
- 238000004519 manufacturing process Methods 0.000 claims description 21
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 20
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 12
- 229910001868 water Inorganic materials 0.000 claims description 12
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 7
- 229910002091 carbon monoxide Inorganic materials 0.000 claims description 7
- 230000002706 hydrostatic effect Effects 0.000 claims description 5
- 229910052739 hydrogen Inorganic materials 0.000 claims description 4
- 239000001257 hydrogen Substances 0.000 claims description 4
- 125000004435 hydrogen atom Chemical class [H]* 0.000 claims description 4
- 230000002045 lasting effect Effects 0.000 abstract description 3
- 230000008901 benefit Effects 0.000 description 10
- 230000015572 biosynthetic process Effects 0.000 description 7
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 6
- 239000003054 catalyst Substances 0.000 description 5
- 230000008859 change Effects 0.000 description 5
- 239000002737 fuel gas Substances 0.000 description 5
- 238000000746 purification Methods 0.000 description 5
- 238000003786 synthesis reaction Methods 0.000 description 5
- 238000006243 chemical reaction Methods 0.000 description 4
- 239000003034 coal gas Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 239000002699 waste material Substances 0.000 description 4
- 229910002092 carbon dioxide Inorganic materials 0.000 description 3
- 239000001569 carbon dioxide Substances 0.000 description 3
- 239000003610 charcoal Substances 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- 238000003860 storage Methods 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 description 2
- ZXYFGZNMDRNOGQ-UHFFFAOYSA-N ac1lawgt Chemical compound [S]O ZXYFGZNMDRNOGQ-UHFFFAOYSA-N 0.000 description 2
- 230000008602 contraction Effects 0.000 description 2
- 229910000037 hydrogen sulfide Inorganic materials 0.000 description 2
- 238000011065 in-situ storage Methods 0.000 description 2
- 229910000510 noble metal Inorganic materials 0.000 description 2
- 231100000614 poison Toxicity 0.000 description 2
- 230000007096 poisonous effect Effects 0.000 description 2
- 230000008439 repair process Effects 0.000 description 2
- 238000003911 water pollution Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 240000002853 Nelumbo nucifera Species 0.000 description 1
- 235000006508 Nelumbo nucifera Nutrition 0.000 description 1
- 235000006510 Nelumbo pentapetala Nutrition 0.000 description 1
- 240000007594 Oryza sativa Species 0.000 description 1
- 235000007164 Oryza sativa Nutrition 0.000 description 1
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 description 1
- GCNLQHANGFOQKY-UHFFFAOYSA-N [C+4].[O-2].[O-2].[Ti+4] Chemical compound [C+4].[O-2].[O-2].[Ti+4] GCNLQHANGFOQKY-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 230000001413 cellular effect Effects 0.000 description 1
- 235000013339 cereals Nutrition 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000011031 large-scale manufacturing process Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 235000009566 rice Nutrition 0.000 description 1
- 230000002194 synthesizing effect Effects 0.000 description 1
- 238000010189 synthetic method Methods 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)
- Industrial Gases (AREA)
Abstract
It is an object of that present invention to provide a kind of underground gasification method and a kind of underground gasification systems.A kind of underground gasification method, cushion gas is stored up in the combustion dummy cell memory that gasification finishes, current gasification unit generate raw coke oven gas underproduce or raw coke oven gas in combustible gas percent by volume and the predetermined value it is inconsistent when, the raw coke oven gas that current gasification unit gasifies is mixed with the cushion gas, to the lasting raw coke oven gas for meeting the predetermined value to raw coke oven gas processing system transporting combustible gases product percentage.A kind of underground gasification system, its subsequent subterranean coal that is used to gasify is raw coke oven gas, and raw coke oven gas is supplied into raw coke oven gas processing system, the underground gasification system includes gasification unit, the underground gasification system further includes the combustion dummy cell being connected to the gasification unit, and the raw coke oven gas of the combustible gas percent by volume higher than predetermined value is stored in the combustion dummy cell as cushion gas.
Description
Technical field
The present invention relates to technical field of coal exploitation, in particular to a kind of underground gasification method and a kind of underground gasification
System.
Background technique
Gasifying underground coal be it is a kind of melt the multidisciplinary comprehensive energy production new technology being integrated, belong to second generation coal mining charcoal
Method, task be raw coke oven gas by underground coal resource in situ conversion, the Main Components of raw coke oven gas be hydrogen, carbon monoxide,
Methane.
A kind of existing coal layer underground gasifying method, comprising steps of establishing gasification tunnel in gasifying coal seam；Described
Multiple destructors are arranged in gasifying coal seam, and the multiple destructor respectively corresponds multiple coals of the gasifying coal seam
Interval；It lights a fire or ignites to start gasification process in the gasification tunnel；And drawn one by one in the way of moving flame-heating
Quick-fried the multiple destructor is to loosen the coal seam section before the gasification of corresponding coal seam section.The present invention by existing in advance
Demolition set is installed in gasifying coal seam, is gasified while passing through explosion and increasing crack in coal seam, in every section of coal seam gasification
Pre- loosening of the preceding completion to this section of coal seam, improves gasification efficiency.
The various unpredictable conditions such as pressure, the underground water of the environment as locating for the gasification unit of gasifying underground coal
In the presence of gasifying underground coal raw coke oven gas yield and raw coke oven gas quality during large-scale production can all have fluctuation, this fluctuation
Can satisfy the normal production phase and positioned at ground raw coke oven gas purification system and synthesis system production requirement and energy
Enough reach certain economic benefit, but in underground gasification unit at the initial stage of ignition (gasification underground coal layer of charcoal initial stage), production latter stage
Coal gas component and gas production can all reduce much when (gasification underground coal layer of charcoal latter stage) and underground gasification unit repair, this is just
The purification system and synthesis system that will lead to raw coke oven gas cross underrun, result even in the stoppage in transit of rear system, in underground gas
Change the purification system and synthesis system of raw coke oven gas when unit at the initial stage of ignition, production latter stage and underground gasification unit repair due to negative
Lotus is lower, and low yield will increase the cost of purification and the synthesis of raw coke oven gas, or even lose.The purification system of specific raw coke oven gas
Start and stop of system and synthesis system are likely to result in hundreds of thousands or loss up to a million.
Summary of the invention
It is raw in gasification unit that it is an object of that present invention to provide a kind of underground gasification methods and a kind of underground gasification system
In the raw coke oven gas of production combustible gas percent by volume and predetermined value is inconsistent or when raw coke oven gas underproduces can fill into cushion gas with
Guarantee the demand of raw coke oven gas processing system industrialization.
In order to achieve the above-mentioned advantages, the present invention provides a kind of underground gasification method, stored in the combustion dummy cell that gasification finishes
Cushion gas, the raw coke oven gas that current gasification unit generates underproduce or raw coke oven gas in combustible gas percent by volume and described predetermined
When being worth inconsistent, the raw coke oven gas that current gasification unit gasifies is mixed with the cushion gas, is handled to lasting to raw coke oven gas
System transporting combustible gases product percentage meets the raw coke oven gas of the predetermined value.
In one embodiment of underground gasification method of the invention, the predetermined value is the raw coke oven gas processing system
The combustible gas percent by volume of production requirement floats up and down 2%.
In one embodiment of underground gasification method of the invention, the cushion gas carrys out the gasification list that autopneumatolysis finishes
Any or any combination raw coke oven gas produced in first, current gasification unit, ground gasification unit.
In one embodiment of underground gasification method of the invention, the cushion gas is concentrated in the combustion dummy cell
Storage is stored according to different combustible gas percent by volume sub-units.
In one embodiment of underground gasification method of the invention, the gas pressure of the cushion gas is slightly below described
Fire the hydrostatic pressure of the underground water at dummy cell.
In one embodiment of underground gasification method of the invention, the temperature of the cushion gas in the combustion dummy cell is
200 DEG C or more.
In one embodiment of underground gasification method of the invention, the combustible gas include hydrogen, carbon monoxide and
Methane.
In order to achieve the above-mentioned advantages, the present invention also provides a kind of underground gasification system, the subsequent subterranean coal that is used to gasify is
Raw coke oven gas, and raw coke oven gas is supplied into raw coke oven gas processing system, the underground gasification system includes gasification unit, the underground coal
Gasification system further includes the combustion dummy cell being connected to the gasification unit, stores cushion gas in the combustion dummy cell.
In one embodiment of underground gasification system of the invention, between the gasification unit and the combustion dummy cell
Equipped with the presser unit for increasing the cushion gas air pressure.
In one embodiment of underground gasification system of the invention, the combustion dummy cell includes multiple for storing not
With the burned out area of the cushion gas of combustible gas percent by volume.
In a kind of underground gasification method of the invention and a kind of underground gasification system, in the waste coal of gasification unit production
Combustible gas volume and predetermined value is inconsistent or when raw coke oven gas underproduces can fill into cushion gas to guarantee that raw coke oven gas is handled in gas
The demand of system industry.
Detailed description of the invention
Fig. 1 show the schematic diagram of the underground gasification system of first embodiment of the invention.
Fig. 2 show the schematic diagram of the underground gasification system of second embodiment of the invention.
Specific embodiment
It is of the invention to reach the technical means and efficacy that predetermined goal of the invention is taken further to illustrate, below in conjunction with
Attached drawing and preferred embodiment, to specific embodiment, structure, feature and its effect is proposed according to the present invention, detailed description is as follows.
The present invention provides a kind of underground gasification method, stores up cushion gas in 11 memory of combustion dummy cell that gasification finishes, is working as
The raw coke oven gas that preceding gasification unit 13 generates underproduce or raw coke oven gas in combustible gas percent by volume and the predetermined value it is inconsistent
When, the raw coke oven gas that current gasification unit 13 gasifies is mixed with the cushion gas, to lasting defeated to raw coke oven gas processing system
The raw coke oven gas for sending combustible gas percent by volume to meet the predetermined value.
The present invention also provides a kind of underground gasification system 10, the subsequent subterranean coal 300 that is used to gasify is raw coke oven gas, and
Raw coke oven gas is supplied into raw coke oven gas processing system 20, the underground gasification system 10 includes gasification unit 13, which is characterized in that institute
Stating underground gasification system 10 further includes the combustion dummy cell 11 being connected to the gasification unit 13, storage in the combustion dummy cell 11
There is cushion gas.
The cushion gas stored in combustion dummy cell 11, wherein combustible gas percent by volume can be higher than predetermined value, can also wait
In predetermined value, it is also smaller than predetermined value.When the raw coke oven gas of current gasification unit 13 gasification underproduces, dummy cell 11 can will be fired
The cushion gas that middle combustible gas percent by volume is equal to predetermined value mixes the waste coal of feeding with the raw coke oven gas that current gasification unit 13 generates
Gas processing system 20；When combustible gas percent by volume is greater than predetermined value in the raw coke oven gas of current gasification unit 13 gasification, it can incite somebody to action
It is mixed to fire the raw coke oven gas that combustible gas percent by volume in dummy cell 11 is less than the cushion gas of predetermined value and current gasification unit 13 generates
It closes and is sent into raw coke oven gas processing system 20；Combustible gas percent by volume is less than predetermined in the raw coke oven gas of current gasification unit 13 gasification
When value, it can will fire what combustible gas percent by volume in dummy cell 11 was generated greater than the cushion gas of predetermined value and current gasification unit 13
Raw coke oven gas processing system 20 is sent into raw coke oven gas mixing.Totally to be sent into fuel gas in the raw coke oven gas of raw coke oven gas processing system 20
Product percentage can continue to keep predetermined value, with the continuity for facilitating later use to produce.
Fig. 1 show the schematic diagram of the underground gasification system of first embodiment of the invention.Referring to Figure 1, the present embodiment
Underground gasification system 10 for gasify subsequent subterranean coal 300 be raw coke oven gas, and by raw coke oven gas supply raw coke oven gas processing system
System 20；Underground gasification system 10 includes combustion dummy cell 11, gasification unit 13, presser unit 15, ground coal gasification unit 17；Its
In middle combustion dummy cell 11 and the coal seam located underground of gasification unit 13, presser unit 15 and ground coal gasification unit 17 are located on the ground；
It fires dummy cell 11, gasification unit 13, be interconnected by pipeline or wellhole between ground coal gasification unit 17, combustion dummy cell 11,
The pipeline being connected between gasification unit 13, ground coal gasification unit 17 passes through raw coke oven gas presser unit 15.
Combustion dummy cell 11 is cushion gas for storing raw coke oven gas, and cushion gas is used for the raw coke oven gas number when gasification unit 13 manufactures
When combustible gas percent by volume is inconsistent with predetermined value in the raw coke oven gas that amount is insufficient or gasification unit 13 manufactures, such as in gasification unit
Cushion gas is added into raw coke oven gas processing when 13 gasification initial stages, gasification latter stage, the maintenance of gasification unit 13 or 13 failure of gasification unit
The industrialization demand for meeting raw coke oven gas processing system 20 in system 20 prevents raw coke oven gas processing system 20 due to a lack of unstripped gas famine
Coal gas and stop production.Combustion dummy cell 11 includes being formed after being gasified by early stage subterranean coal 100 by subterranean coal early period combustion dummy cell 11
The first burned out area 111, the second burned out area 112, third burned out area 113, the 4th burned out area 114.First burned out area 111, second
Burned out area 112, third burned out area 113, the 4th burned out area 114 are connected to presser unit 15 and raw coke oven gas processing system 20, and combustion is empty
Combustion dummy cell control valve is equipped between unit 11 and raw coke oven gas processing system 20；First burned out area 111, the second burned out area 112,
It is mutually indepedent between three burned out area 113, the 4th burned out area, the first burned out area 111, the second burned out area 112, third burned out area 113,
4th burned out area 114 is mounted on for controlling and the burned out area control valve of 15 connected state of presser unit.
There is huge space can reach tens of thousands of cubic meters or more for the inside of combustion dummy cell 11, it might even be possible to reach hundreds of
Ten thousand stere.Combustion dummy cell 11 be early stage subterranean coal 100 gasify after formed, therefore fire dummy cell 11 have be connected to ground
Pipeline, combustion dummy cell 11 be usually located in subterranean coal, the distance apart from ground is usually several hundred rice, and most deep can achieve
Upper km.More burned out area can also be arranged to store the raw coke oven gas of different cultivars for cushion gas, such as respectively in combustion dummy cell 11
Storing the raw coke oven gas that combustible gas percent by volume is 35%, 40%, 45%, 55%, 60%, 65%, 70% is cushion gas.Waste coal
The combustible gas of gas is mainly hydrogen, carbon monoxide, methane.Combustion dummy cell 11 can also be put into the catalyst of methanation reaction, such as
Nickel-base catalyst, noble metal catalyst.Certainly remaining raw coke oven gas can also be used as cushion gas use in combustion dummy cell 11.
Gasification unit 13 is raw coke oven gas, the raw coke oven gas conduct that gasification unit 13 gasifies for subsequent gasification coal seam 300 of gasifying
The main source of the unstripped gas of raw coke oven gas processing system 20.Gasification unit 13 and presser unit 15 and raw coke oven gas processing system 20 connect
It is logical, gasification unit control valve is equipped between gasification unit 13 and raw coke oven gas processing system 20；Gasification unit 13 includes the first gasification
Furnace 131, the second gasification furnace 132, third gasification furnace 133, the 4th gasification furnace 134, the first gasification furnace 131, the second gasification furnace 132,
It is mutually indepedent between third gasification furnace 133, the 4th gasification furnace 134, the first gasification furnace 131, the second gasification furnace 132, third gasification
Furnace 133, the 4th gasification furnace 134 are mounted on for controlling and the gasifier control system valve of 15 connected state of presser unit.Gasification is single
Member 13 is all very low in the combustible gas percent by volume of the raw coke oven gas of the initial stage manufacture of gasification production and the yield of raw coke oven gas, it is difficult to
The requirement for meeting the starting of raw coke oven gas processing system 20 or industrialization, i.e., can not start or can not obtain economic benefit.Gasification unit
The higher temperature of the raw coke oven gas of 13 gasifications is usually 200 DEG C or more, can achieve 300 DEG C or more sometimes.It fires residual in dummy cell 11
The coal stayed will synthesize the methane of a part with water, carbon monoxide, the carbon dioxide in raw coke oven gas at this temperature, to improve famine
The clean energy degree of coal gas.
Presser unit 15 is located at ground or more, and presser unit 15 is used to carry out raw coke oven gas compression and is stored into combustion dummy cell 11
It is interior to be used as cushion gas, while presser unit 15 can guarantee that cushion gas has certain pressure to prevent the burned out area in underground
Collapsing or contraction distortion；The pressure of cushion gas preferably slightly below fires the hydrostatic pressure of the underground water near dummy cell 11, such as underground
The hydrostatic pressure of water is 1.6Mpa, and the pressure of cushion gas is preferably 1.45Mpa~1.55Mpa, because if the pressure of cushion gas
Be greater than or close to underground water hydrostatic pressure except be easy to causeing cushion gas loss, the hydrogen sulfide having in cushion gas, hydroxyl sulphur,
The poisonous and harmful substances such as tar are also easy to cause underground water pollution.
Ground coal gasification unit 17 is for turning to the fuel gas product higher raw coke oven gas of percentage for coal gas on the ground, such as
Combustible gas percent by volume reaches 50%~70% or more raw coke oven gas, grain of the ground coal gasifying process due to the coal raw material of use
Diameter is ideal, and gasification reaction conditions are also easy to control, therefore the fuel gas of the raw coke oven gas of the gasification of ground coal gasification unit 17
Product percentage is usually above the combustible gas percent by volume of raw coke oven gas manufactured by in-situ coal gasification process, but due to ground coal
Gasification unit 17 it is at high cost, yield is small and unstable, at the same every time starting ground coal gasification unit 17 manufacture raw coke oven gas need
A large amount of human and material resources, financial resources are expended, therefore raw coke oven gas manufactured by ground coal gasification unit 17 should not be used as raw coke oven gas processing
The raw material main source of system, existing technology can not start coal gasification unit 17 frequently with should be caused by gasification unit 13
Raw coke oven gas yield and quality fluctuation.
But the large number of raw coke oven gas of manufacture that ground coal gasification unit 17 can be concentrated in the present embodiment is stored into combustion
In dummy cell 11, the combustible gas volume hundred with higher of raw coke oven gas manufactured by ground coal gasification unit 17 is taken full advantage of in this way
Point than the advantages of, while avoid repeatedly starting ground coal gasification unit 17 caused by unnecessary cost.Ground coal gasification
The raw coke oven gas that unit 17 makes can store different combustible gas volume basis in the different burned out area of combustion dummy cell 11
The raw coke oven gas of ratio is to cope with different situations.The raw coke oven gas that ground coal gasification unit 17 manufactures can pressurize by presser unit 15
It is transported to again in combustion dummy cell 11 afterwards.The temperature for the raw coke oven gas that ground coal gasification unit 17 is gasified is higher, can generally achieve
200 DEG C to 300 DEG C or more.Fire dummy cell 11 in remaining coal at this temperature with the water in raw coke oven gas, carbon monoxide, titanium dioxide
Carbon will synthesize the methane of a part, to improve the clean energy degree of raw coke oven gas.
Raw coke oven gas processing system 20 is used to raw coke oven gas producing new product as raw material, such as carries out first using raw coke oven gas
Alkanisation manufactures natural gas, and raw coke oven gas processing system 20 is to the stable yield of raw coke oven gas, while combustible gas volume basis in raw coke oven gas
Economic benefit can be generated than needing to meet predetermined value.Predetermined value is the fuel gas of 20 production requirement of raw coke oven gas processing system
Product percentage floats up and down 2%.Raw coke oven gas processing system 20 can be also used for purifying raw coke oven gas, remove in raw coke oven gas
Harmful substance, such as tar, sulfide prevents raw coke oven gas when burning to atmosphere to improve the clean-up performance of the raw coke oven gas energy
It pollutes.Predetermined value is 30% or more in the present embodiment.Certain predetermined value is in other embodiments according to raw coke oven gas processing system
System 20 production requirement can be other ranges, such as 20% or more, 40% or more, 50% or more, 60% or more, 70% with
On；20%~70%, 40%~70%.
Furthermore predetermined value is 40% in general.
The underground gasification system of the present embodiment can carry out control manufacture raw coke oven gas to raw coke oven gas in accordance with the following steps:
A, subterranean coal early period 100 is gasified as raw coke oven gas, formation combustion dummy cell 11；
B, it is empty single that combustion is stored into after the pressurized unit 15 of the raw coke oven gas for the high-quality that ground gasification unit 17 gasifies pressurizeing
Cushion gas is used as in member 11.
C, starting gasification unit 13 produces raw coke oven gas；
D, when the raw coke oven gas that gasification unit 13 gasifies underproduces or raw coke oven gas in combustible gas percent by volume lower than predetermined
When value, sent after the raw coke oven gas that gasification unit 13 gasifies is mixed with cushion gas to raw coke oven gas processing system；
E, when the raw coke oven gas yield excess that gasification unit 13 gasifies, the pressurized list of the raw coke oven gas that gasification unit 13 is gasified
The first burned out area 111, the second burned out area 112, third burned out area 113, the 4th burned out area 114 are stored into after 15 pressurization of member as standby
With gas.
F, it should be noted that the first gasification furnace 131, the second gasification furnace 132, third gasification furnace 133, the 4th gasification furnace 134
New combustion dummy cell will be can be used as to store raw coke oven gas after the gasification of subsequent subterranean coal 300.
It is to be noted that when the raw coke oven gas yield excess that gasification unit 13 gasifies, the waste coal of the gasification of gasification unit 13
The combustible gas high percentage of gas is in 40%.
Fig. 2 show the schematic diagram of the underground gasification system of second embodiment of the invention.Refer to Fig. 2, the present embodiment
Underground gasification system 10 it is similar to the structure of the underground gasification system of first embodiment and principle, the difference of the two exists
In:
The underground gasification system 10 of the present embodiment only includes combustion dummy cell 11, gasification unit 13；Fire dummy cell 11 and gas
Change unit 13 to be connected to.Predetermined value is 40% or more in the present embodiment.
The underground gasification system of the present embodiment can carry out control manufacture raw coke oven gas to raw coke oven gas in accordance with the following steps:
A ', subterranean coal early period 100 is gasified as raw coke oven gas, formation combustion dummy cell 11；
B ', starting gasification unit 13 produce raw coke oven gas；
C ', it is stored into the first burned out area 111 after the raw coke oven gas that gasification unit 13 produces pressurizes as cushion gas；
D ', the raw coke oven gas combustible gas volume high percentage to gasify when gasification unit 13 are in 40% when, by 13 gas of gasification unit
The raw coke oven gas of change is sent to raw coke oven gas processing system；
E ', when gasification unit 13 gasify raw coke oven gas yield excess when, the raw coke oven gas that gasification unit 13 is gasified is pressurized
Unit 15 is stored into the first burned out area 111 as cushion gas after pressurizeing.
F ', when the raw coke oven gas that gasification unit 13 gasifies underproduce or raw coke oven gas in combustible gas percent by volume lower than predetermined
When value, sent after the raw coke oven gas that gasification unit 13 gasifies is mixed with cushion gas to raw coke oven gas processing system；
It should be noted that fuel gas percentage can be inconsistent with predetermined value in cushion gas in step C ', such as 10%,
20%, 30%.
The other parts of the present embodiment are identical as the underground gasification system structure and principle of first embodiment, herein no longer
It repeats.
In other embodiments of the invention, the combustible gas percent by volume of cushion gas can be lower than predetermined value, specifically
When predetermined value is 38%~42%, if the combustible gas volume high percentage for the raw coke oven gas that gasification unit 13 is gasified is in predetermined value
When, raw coke oven gas and cushion gas that gasification unit 13 is gasified, which are mixed into, to be had and the consistent combustible gas percent by volume of predetermined value
Raw coke oven gas after be delivered to raw coke oven gas processing system 20 again.The combustible gas of raw coke oven gas used in raw coke oven gas processing system 20 in this way
Percent by volume is more stable.
In conclusion methane synthetic method of the invention at least has the advantage that
1. it is an object of that present invention to provide a kind of underground gasification methods in gas in underground gasification method of the invention
Change combustible gas volume in the raw coke oven gas of cellular manufacture and predetermined value is inconsistent or when raw coke oven gas underproduces can fill into high-quality
Raw coke oven gas to guarantee the demand of raw coke oven gas processing system industrialization.
2. in one embodiment of underground gasification method of the invention, using the presser unit pair for being located at ground or more
Raw coke oven gas is stored into combustion dummy cell as cushion gas after being compressed, it is ensured that there is cushion gas certain pressure to prevent
Burned out area in underground collapses or contraction distortion；The pressure of cushion gas preferably slightly below fires the quiet of the underground water near dummy cell
Water pressure is in this way in addition to preventing cushion gas loss, and the poisonous and harmful substances such as hydrogen sulfide, hydroxyl sulphur, tar for having in cushion gas are also
It will not cause underground water pollution.
3. the combustion formed after coal seam gasification will be descended early in one embodiment of underground gasification method of the invention
Dead zone takes full advantage of the large space advantage of burned out area as the place for storing for future use gas, additionally due to the temperature of raw coke oven gas is logical
Often can achieve 200 DEG C to 300 DEG C or more, fire in dummy cell remaining coal at this temperature with the water in raw coke oven gas, an oxidation
Carbon, carbon dioxide will synthesize the methane of a part, to improve the clean energy degree of raw coke oven gas.
4. being put into urging for methanation reaction in burned out area in one embodiment of underground gasification method of the invention
Agent can make to fire in this way that remaining coal in dummy cell is as much as possible and raw coke oven gas such as nickel-base catalyst, noble metal catalyst
In water, carbon monoxide, carbon dioxide will synthesizing methane, to improve the clean energy degree of raw coke oven gas, while part being fired
Residual coal gasification in dead zone.
5, in one embodiment of underground gasification method of the invention, more burned out area are can be set in combustion dummy cell
Come store different cultivars raw coke oven gas be cushion gas, such as respectively storage combustible gas percent by volume be 40%, 45%, 55%,
60%, 65%, 70% raw coke oven gas is cushion gas.In this way when the yield of gasification furnace or the combustible gas volume hundred of the raw coke oven gas of manufacture
Point than it is different when different cushion gas can be selected to be mixed with, with adequately guarantee raw coke oven gas processing system industrialization need
It asks.
The above described is only a preferred embodiment of the present invention, be not intended to limit the present invention in any form, though
So the present invention has been disclosed as a preferred embodiment, and however, it is not intended to limit the invention, any technology people for being familiar with this profession
Member, without departing from the scope of the present invention, when the technology contents using the disclosure above make a little change or modification
It is right according to the technical essence of the invention for the equivalent embodiment of equivalent variations, but without departing from the technical solutions of the present invention
Any simple modification, equivalent variations and modification made by above embodiments, all of which are still within the scope of the technical scheme of the invention.
Claims (8)
1. a kind of underground gasification method, which is characterized in that cushion gas is stored up in combustion dummy cell (11) memory that gasification finishes, it is described
Cushion gas comes any or any in gasification unit, current gasification unit (13), ground gasification unit (17) that autopneumatolysis finishes
Combine raw coke oven gas produced, current gasification unit (13) generate raw coke oven gas underproduce or raw coke oven gas in combustible gas volume
When percentage and predetermined value are inconsistent, the raw coke oven gas that current gasification unit (13) gasify is mixed with the cushion gas, to hold
The continuous raw coke oven gas for meeting the predetermined value to raw coke oven gas processing system transporting combustible gases product percentage, the combustion dummy cell
(11) temperature of the cushion gas in is 200 DEG C or more.
2. underground gasification method as described in claim 1, which is characterized in that the predetermined value is the raw coke oven gas processing system
The combustible gas percent by volume of system production requirement floats up and down 2%.
3. underground gasification method as described in claim 1, which is characterized in that the cushion gas is in the combustion dummy cell (11)
In it is centrally stored or according to different combustible gas percent by volume sub-units store.
4. underground gasification method as described in claim 1, which is characterized in that the gas pressure of the cushion gas is slightly below institute
State the hydrostatic pressure of the underground water at combustion dummy cell (11).
5. underground gasification method as described in claim 1, which is characterized in that the combustible gas includes hydrogen, carbon monoxide
And methane.
6. a kind of underground gasification system (10) is used to gasify subsequent subterranean coal (300) as raw coke oven gas, and raw coke oven gas is supplied
It gives raw coke oven gas processing system (20), the underground gasification system (10) includes gasification unit (13), which is characterized in that describedly
Lower gasification system (10) further includes the combustion dummy cell (11) being connected to the gasification unit (13), and the combustion dummy cell (11) is interior
Cushion gas is stored, the temperature of the cushion gas in the combustion dummy cell is 200 DEG C or more, and the cushion gas carrys out autopneumatolysis and finishes
Gasification unit, current gasification unit (13), any or any combination raw coke oven gas produced in ground gasification unit (17).
7. underground gasification system (10) as claimed in claim 6, which is characterized in that the gasification unit (13) and the combustion
The presser unit (15) for increasing the cushion gas air pressure is equipped between dummy cell (11).
8. underground gasification system (10) as claimed in claim 6, which is characterized in that the combustion dummy cell (11) includes multiple
For storing the burned out area (111,112,113,114) of the cushion gas of different combustible gas percents by volume.
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