CN104675376A - Underground coal gasification method and underground coal gasification system - Google Patents
Underground coal gasification method and underground coal gasification system Download PDFInfo
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- CN104675376A CN104675376A CN201510094964.1A CN201510094964A CN104675376A CN 104675376 A CN104675376 A CN 104675376A CN 201510094964 A CN201510094964 A CN 201510094964A CN 104675376 A CN104675376 A CN 104675376A
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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 invention aims at providing an underground coal gasification method and an underground coal gasification system. The underground coal gasification method is characterized in that standby gas is stored in an air combustion unit after the gasification completion, and when the yield of raw gas generated by the current gasification unit is insufficient or the volume percent of combustible gas in the raw gas is not inconsistent with a preset value, the raw gas gasified by the current gasification unit is mixed with the standby gas, so that the raw gas with the combustible gas volume percent conforming to the preset value is continuously conveyed to a raw gas treatment system. The underground coal gasification system is used for gasifying the subsequent underground coal bed into the raw gas, in addition, the raw gas is supplied to the raw gas processing system, the underground coal gasification system comprises the gasification unit and the air consumption unit communicated with the gasification unit, and the raw gas with the combustible gas volume percent higher than the preset value is stored in the air consumption unit as the standby gas.
Description
Technical field
The present invention relates to technical field of coal exploitation, particularly a kind of underground gasification method and a kind of underground gasification system.
Background technology
Gasifying underground coal a kind ofly melts the multidisciplinary comprehensive energy production new technology be integrated, and belongs to second generation coal mining charcoal method, and its task is raw coke oven gas by underground coal resource in situ conversion, and the Main Components of raw coke oven gas is hydrogen, carbon monoxide, methane.
A kind of existing coal layer underground gasifying method, comprises step: in for gasification coal seam, set up gasification tunnel; Multiple destructor is arranged in described wish gasification coal seam, and described multiple destructor corresponding described multiple coal seams section for coal seam of gasifying respectively; Light a fire in described gasification tunnel or ignite to start gasifying process; And utilize flame to move mode of heating to ignite described multiple destructor one by one with loosening described coal seam section before the coal seam section gasification of correspondence.The present invention, by installing demolition set in advance in for gasification coal seam, increases crack by explosion while gasification in coal seam, completes and loosens the pre-of this section of coal seam, improve gasification efficiency before every section of coal seam gasification.
Due to gasifying underground coal gasification unit residing for the pressure of environment, the existence of the various unpredictable condition such as underground water, gasifying underground coal raw coke oven gas output and raw coke oven gas quality in large-scale production process all can have fluctuation, this fluctuation can meet in the normal production phase and is positioned at the cleaning system of raw coke oven gas on ground and the production requirement of synthesis system and can reaches certain economic benefit, but at underground gasification unit Initial Stage after Ignition (gasification underground coal layer initial stage), when production latter stage (gasification underground coal layer latter stage) and the maintenance of underground gasification unit, coal gas component and gas production all can reduce a lot, this will cause the cleaning system of raw coke oven gas and synthesis system to cross underrun, even can cause the stoppage in transit of rear system, at underground gasification unit Initial Stage after Ignition, when producing latter stage and the maintenance of underground gasification unit the cleaning system of raw coke oven gas and synthesis system due to load lower, productive rate is low can increase the purification of raw coke oven gas and the cost of synthesis, even there is loss.The cleaning system of concrete raw coke oven gas and synthesis system start and stop may cause hundreds of thousands or loss up to a million.
Summary of the invention
The object of the invention be to provide a kind of underground gasification method and a kind of underground gasification system in the raw coke oven gas that gasification unit is produced combustible gas percent by volume and predetermined value is inconsistent or raw coke oven gas is underproduce time can fill into cushion gas to ensure the demand of raw coke oven gas treatment system industrialization.
For reaching above-mentioned advantage, the invention provides a kind of underground gasification method, at the combustion dummy cell internal memory storage cushion gas that gasification is complete, at the raw coke oven gas that current gasification unit produces in underproduce or raw coke oven gas combustible gas percent by volume and described predetermined value inconsistent time, the raw coke oven gas current gasification unit gasified mixes with described cushion gas, amasss the raw coke oven gas that percentage meets described predetermined value in order to what continue to raw coke oven gas treatment system transporting combustible gases.
In an embodiment of underground gasification method of the present invention, described predetermined value is that the combustible gas percent by volume of described raw coke oven gas treatment system Production requirement fluctuates 2%.
In an embodiment of underground gasification method of the present invention, described cushion gas carrys out the raw coke oven gas that the arbitrary or any combination in the complete gasification unit of autopneumatolysis, current gasification unit, on the ground gasification unit is produced.
In an embodiment of underground gasification method of the present invention, described cushion gas is concentrated and is stored or store according to different combustible gas percent by volume subdivision in described combustion dummy cell.
In an embodiment of underground gasification method of the present invention, the gas pressure of described cushion gas is a little less than the hydrostatic pressure of the underground water at described combustion dummy cell place.
In an embodiment of underground gasification method of the present invention, the temperature of the cushion gas in described combustion dummy cell is more than 200 DEG C.
In an embodiment of underground gasification method of the present invention, described combustible gas comprises hydrogen, carbon monoxide and methane.
For reaching above-mentioned advantage, the present invention also provides a kind of underground gasification system, it is raw coke oven gas for the follow-up subterranean coal that gasifies, and raw coke oven gas is supplied raw coke oven gas treatment system, described underground gasification system comprises gasification unit, described underground gasification system also comprises the combustion dummy cell be communicated with described gasification unit, stores cushion gas in described combustion dummy cell.
In an embodiment of underground gasification system of the present invention, between described gasification unit and described combustion dummy cell, be provided with the presser unit for increasing described cushion gas air pressure.
In an embodiment of underground gasification system of the present invention, described combustion dummy cell comprises the burned out area of multiple cushion gas for storing different combustible gas percent by volume.
In a kind of underground gasification method of the present invention and a kind of underground gasification system, in the raw coke oven gas that gasification unit is produced combustible gas volume and predetermined value is inconsistent or raw coke oven gas is underproduce time can fill into cushion gas to ensure the demand of raw coke oven gas treatment system industrialization.
Accompanying drawing explanation
Figure 1 shows that the schematic diagram of the underground gasification system of first embodiment of the invention.
Figure 2 shows that the schematic diagram of the underground gasification system of second embodiment of the invention.
Detailed description of the invention
For further setting forth the present invention for the technological means reaching predetermined goal of the invention and take and effect, below in conjunction with accompanying drawing and preferred embodiment, proposing detailed description of the invention, structure, feature and effect thereof to according to the present invention, being described in detail as follows.
The invention provides a kind of underground gasification method, at the combustion dummy cell 11 internal memory storage cushion gas that gasification is complete, at the raw coke oven gas that current gasification unit 13 produces in underproduce or raw coke oven gas combustible gas percent by volume and described predetermined value inconsistent time, the raw coke oven gas that current gasification unit 13 gasifies is mixed with described cushion gas, amasss to raw coke oven gas treatment system transporting combustible gases the raw coke oven gas that percentage meets described predetermined value in order to what continue.
The present invention also provides a kind of underground gasification system 10, it is raw coke oven gas for the follow-up subterranean coal 300 that gasifies, and raw coke oven gas is supplied raw coke oven gas treatment system 20, described underground gasification system 10 comprises gasification unit 13, it is characterized in that, described underground gasification system 10 also comprises the combustion dummy cell 11 be communicated with described gasification unit 13, stores cushion gas in described combustion dummy cell 11.
The cushion gas stored in combustion dummy cell 11, wherein combustible gas percent by volume higher than predetermined value, also can equal predetermined value, also can be less than predetermined value.When the raw coke oven gas that current gasification unit 13 gasifies is underproduce, the cushion gas that combustible gas percent by volume in combustion dummy cell 11 can be equaled predetermined value mixes with the raw coke oven gas that current gasification unit 13 produces sends into raw coke oven gas treatment system 20; When in the raw coke oven gas that current gasification unit 13 gasifies, combustible gas percent by volume is greater than predetermined value, the cushion gas that combustible gas percent by volume in combustion dummy cell 11 can be less than predetermined value mixes with the raw coke oven gas that current gasification unit 13 produces sends into raw coke oven gas treatment system 20; When in the raw coke oven gas that current gasification unit 13 gasifies, combustible gas percent by volume is less than predetermined value, the cushion gas that combustible gas percent by volume in combustion dummy cell 11 can be greater than predetermined value mixes with the raw coke oven gas that current gasification unit 13 produces sends into raw coke oven gas treatment system 20.Totally make combustible gas percent by volume in the raw coke oven gas of feeding raw coke oven gas treatment system 20 can continue to keep predetermined value, the continuity of producing to facilitate later use.
Figure 1 shows that the schematic diagram of the underground gasification system of first embodiment of the invention.Refer to Fig. 1, the underground gasification system 10 of the present embodiment is raw coke oven gas for the follow-up subterranean coal 300 that gasifies, and raw coke oven gas is supplied raw coke oven gas treatment system 20; Underground gasification system 10 comprises combustion dummy cell 11, gasification unit 13, presser unit 15, on the ground coal gasification unit 17; Wherein combustion dummy cell 11 and gasification unit 13 are arranged in subterranean coal, and presser unit 15 and on the ground coal gasification unit 17 are positioned on the ground; Be interconnected by pipeline or wellhole between combustion dummy cell 11, gasification unit 13, ground coal gasification unit 17, the pipeline of combustion dummy cell 11, gasification unit 13, connection between coal gasification unit 17 is on the ground by raw coke oven gas presser unit 15.
Combustion dummy cell 11 is cushion gas for storing raw coke oven gas, cushion gas be used for when gasification unit 13 manufacture raw coke oven gas lazy weight or gasification unit 13 manufacture raw coke oven gas in combustible gas percent by volume and predetermined value inconsistent time, as initial stage of gasifying in gasification unit 13, gasification latter stage, gasification unit 13 keep in repair or gasification unit 13 fault time cushion gas to be added in raw coke oven gas treatment system 20 to meet the industrialization demand of raw coke oven gas treatment system 20, prevent raw coke oven gas treatment system 20 for want of unstripped gas raw coke oven gas and stopping production.Combustion dummy cell 11 by subterranean coal in early stage fire dummy cell 11 comprise gasified by early stage subterranean coal 100 after the first burned out area 111, second burned out area 112, the 3rd burned out area 113, the 4th burned out area 114 that are formed.First burned out area 111, second burned out area 112, the 3rd burned out area 113, the 4th burned out area 114 are communicated with raw coke oven gas treatment system 20 with presser unit 15, are provided with combustion dummy cell control valve between combustion dummy cell 11 and raw coke oven gas treatment system 20; Separate between first burned out area 111, second burned out area 112, the 3rd burned out area 113, the 4th burned out area, the first burned out area 111, second burned out area 112, the 3rd burned out area 113, the 4th burned out area 114 are all provided with for controlling the burned out area control valve with presser unit 15 connected state.
The inside of combustion dummy cell 11 has huge space and can arrive more than tens thousand of cubic meter, even can reach millions of cubic meter.Combustion dummy cell 11 is formed after early stage subterranean coal 100 gasifies, and therefore fires dummy cell 11 and have the pipeline be communicated with ground, and combustion dummy cell 11 is usually located in subterranean coal, and the distance on distance ground is generally hundreds of rice, and the darkest can reach km.Combustion dummy cell 11 more burned out area can also be set to store the raw coke oven gas of different cultivars for cushion gas, as store respectively combustible gas percent by volume be 35%, 40%, 45%, 55%, 60%, 65%, 70% raw coke oven gas be cushion gas.The combustible gas of raw coke oven gas is mainly hydrogen, carbon monoxide, methane.Combustion dummy cell 11 can also put into the catalyzer of methanation reaction, as nickel-base catalyst, noble metal catalyst.In certain combustion dummy cell 11, residual raw coke oven gas also can use as cushion gas.
Gasification unit 13 is raw coke oven gas for follow-up gasification coal seam 300 of gasifying, and the raw coke oven gas that gasification unit 13 gasifies is as the main source of the unstripped gas of raw coke oven gas treatment system 20.Gasification unit 13 is communicated with raw coke oven gas treatment system 20 with presser unit 15, is provided with gasification unit control valve between gasification unit 13 and raw coke oven gas treatment system 20; Gasification unit 13 comprises the first gasification furnace 131, second gasification furnace 132, the 3rd gasification furnace 133, the 4th gasification furnace 134, separate between first gasification furnace 131, second gasification furnace 132, the 3rd gasification furnace 133, the 4th gasification furnace 134, the first gasification furnace 131, second gasification furnace 132, the 3rd gasification furnace 133, the 4th gasification furnace 134 are all provided with for controlling the gasifier control system valve with presser unit 15 connected state.The output of the combustible gas percent by volume of raw coke oven gas that gasification unit 13 manufactured at the initial stage that gasification is produced and raw coke oven gas is all very low, is difficult to meet raw coke oven gas treatment system 20 and starts or the requirement of industrialization, namely cannot start and maybe cannot obtain economic benefit.The temperature of the raw coke oven gas that gasification unit 13 gasifies is higher is generally more than 200 DEG C, sometimes can reach more than 300 DEG C.In combustion dummy cell 11, residual coal will synthesize the methane of a part at this temperature with the water in raw coke oven gas, carbon monoxide, carbon dioxide, to improve the clean energy degree of raw coke oven gas.
Presser unit 15 is positioned at more than ground, presser unit 15 is stored into as cushion gas in combustion dummy cell 11 for raw coke oven gas being carried out compression, and presser unit 15 can ensure that cushion gas has certain pressure to prevent the burned out area being in underground and caves in or shrinkage strain simultaneously; The pressure of cushion gas is preferably a little less than the hydrostatic pressure of the underground water near combustion dummy cell 11, hydrostatic pressure as underground water is 1.6Mpa, the pressure of cushion gas is preferably 1.45Mpa ~ 1.55Mpa, because if the pressure of cushion gas is greater than or close to the hydrostatic pressure of underground water except easily causing cushion gas loss, the poisonous and harmful substances such as the hydrogen sulfide had in cushion gas, hydroxyl sulphur, tar also easily cause groundwater pollution.
Coal gasification unit 17 amasss the higher raw coke oven gas of percentage on the ground coal gas being turned to fuel gas on the ground, as combustible gas percent by volume reaches the raw coke oven gas of more than 50% ~ 70%, on the ground coal gasifying process due to the particle diameter of the coal raw material adopted ideal, gasification reaction conditions also easily controls, therefore the combustible gas percent by volume of the raw coke oven gas of coal gasification unit 17 gasification is on the ground usually all higher than the combustible gas percent by volume of the raw coke oven gas manufactured by in-situ coal gasification process, but because the cost of ground coal gasification unit 17 is high, output is little and unstable, each startup ground coal gasification unit 17 manufactures the manpower that raw coke oven gas needs at substantial simultaneously, material resources, financial resources, therefore the raw coke oven gas on the ground manufactured by coal gasification unit 17 should as the raw material main source of raw coke oven gas treatment system, existing technology cannot start coal gasification unit 17 frequently with should the fluctuation of raw coke oven gas yield and quality that causes of gasification unit 13.
But the raw coke oven gas of manufacture larger amt that on the ground coal gasification unit 17 can be concentrated in the present embodiment is stored in combustion dummy cell 11, the raw coke oven gas taken full advantage of so on the ground manufactured by coal gasification unit 17 has the advantage of higher combustible gas percent by volume, avoids the unnecessary cost repeatedly starting coal gasification unit 17 on the ground and produce simultaneously.The raw coke oven gas that coal gasification unit 17 makes on the ground can store the raw coke oven gas of different combustible gas percent by volume to tackle different situations in the different burned out area of combustion dummy cell 11.The raw coke oven gas that coal gasification unit 17 manufactures on the ground can be transported in combustion dummy cell 11 after presser unit 15 is pressurizeed again.The temperature of the raw coke oven gas that ground coal gasification unit 17 gasifies is higher, usually can reach 200 DEG C to more than 300 DEG C.In combustion dummy cell 11, residual coal will synthesize the methane of a part at this temperature with the water in raw coke oven gas, carbon monoxide, carbon dioxide, to improve the clean energy degree of raw coke oven gas.
The product of raw coke oven gas treatment system 20 for raw coke oven gas is made new advances as raw material manufacture, carry out methanation as used raw coke oven gas and manufacture natural gas, the stable yield of raw coke oven gas treatment system 20 pairs of raw coke oven gas, in raw coke oven gas, combustible gas percent by volume demand fulfillment predetermined value can produce economic benefit simultaneously.Predetermined value is that the combustible gas percent by volume of raw coke oven gas treatment system 20 Production requirement fluctuates 2%.Raw coke oven gas treatment system 20 can also be used for purifying raw coke oven gas, the hazardous substances namely removed in raw coke oven gas, as tar, sulfide etc., to improve the clean-up performance of the raw coke oven gas energy, pollutes when preventing raw coke oven gas from burning to air.In the present embodiment, predetermined value is more than 30%.Certain predetermined value can be other scope in other embodiments according to the Production requirement of raw coke oven gas treatment system 20, as more than 20%, more than 40%, more than 50%, more than 60%, more than 70%; 20% ~ 70%, 40% ~ 70%.
In addition predetermined value is 40% under normal conditions.
The underground gasification system of the present embodiment can be carried out control to raw coke oven gas in accordance with the following steps and be manufactured raw coke oven gas:
A, subterranean coal in early stage 100 is gasified as raw coke oven gas, form combustion dummy cell 11;
B, the raw coke oven gas of high-quality ground gasification unit 17 gasified are stored in combustion dummy cell 11 as cushion gas after presser unit 15 is pressurizeed.
C, startup gasification unit 13 produce raw coke oven gas;
D, when combustible gas percent by volume is lower than predetermined value in the underproduce or raw coke oven gas of raw coke oven gas that gasification unit 13 gasifies, after being mixed with cushion gas by the raw coke oven gas that gasification unit 13 gasifies, deliver to raw coke oven gas treatment system;
E, when gasification unit 13 gasify raw coke oven gas output excessive time, raw coke oven gas gasification unit 13 gasified is stored into the first burned out area 111, second burned out area 112, the 3rd burned out area 113, the 4th burned out area 114 as cushion gas after presser unit 15 is pressurizeed.
F, it should be noted that the first gasification furnace 131, second gasification furnace 132, the 3rd gasification furnace 133, the 4th gasification furnace 134 are using can as new combustion dummy cell in order to store raw coke oven gas after follow-up subterranean coal 300 gasifies.
It is to be noted that when the raw coke oven gas output that gasification unit 13 gasifies is excessive, the combustible gas percentage of the raw coke oven gas that gasification unit 13 gasifies is higher than 40%.
Figure 2 shows that the schematic diagram of the underground gasification system of second embodiment of the invention.Refer to Fig. 2, the underground gasification system 10 of the present embodiment is similar with principle to the structure of the underground gasification system of the first embodiment, and the difference of the two is:
The underground gasification system 10 of the present embodiment only comprises combustion dummy cell 11, gasification unit 13; Combustion dummy cell 11 is communicated with gasification unit 13.In the present embodiment, predetermined value is more than 40%.
The underground gasification system of the present embodiment can be carried out control to raw coke oven gas in accordance with the following steps and be manufactured raw coke oven gas:
A ', subterranean coal in early stage 100 is gasified as raw coke oven gas, form combustion dummy cell 11;
B ', startup gasification unit 13 produce raw coke oven gas;
C ', raw coke oven gas gasification unit 13 produced are stored in the first burned out area 111 as cushion gas after pressurizeing;
D ', when gasification unit 13 gasify raw coke oven gas combustible gas percent by volume higher than 40% time, the raw coke oven gas that gasification unit 13 gasifies is delivered to raw coke oven gas treatment system;
E ', when gasification unit 13 gasify raw coke oven gas output excessive time, raw coke oven gas gasification unit 13 gasified is stored in the first burned out area 111 as cushion gas after presser unit 15 is pressurizeed.
F ', when combustible gas percent by volume is lower than predetermined value in the underproduce or raw coke oven gas of raw coke oven gas that gasification unit 13 gasifies, after being mixed with cushion gas by the raw coke oven gas that gasification unit 13 gasifies, deliver to raw coke oven gas treatment system;
It should be noted that in step C ', in cushion gas, fuel gas percentage can be inconsistent with predetermined value, as 10%, 20%, 30%.
Other parts of the present embodiment are identical with principle with the underground gasification system architecture of the first embodiment, do not repeat them here.
In other embodiments of the invention, the combustible gas percent by volume of cushion gas can lower than predetermined value, it is concrete when predetermined value is 38% ~ 42%, if when the combustible gas percent by volume of the raw coke oven gas that gasification unit 13 gasifies is higher than predetermined value, raw coke oven gas gasification unit 13 gasified and cushion gas are delivered to raw coke oven gas treatment system 20 after being mixed into the raw coke oven gas with the combustible gas percent by volume consistent with predetermined value again.The combustible gas percent by volume of the raw coke oven gas that such raw coke oven gas treatment system 20 uses is more stable.
In sum, methane synthetic method of the present invention at least has following advantage:
1. in underground gasification method of the present invention, the object of the invention be to provide a kind of underground gasification method in the raw coke oven gas that gasification unit is produced combustible gas volume and predetermined value is inconsistent or raw coke oven gas is underproduce time can fill into the raw coke oven gas of high-quality to ensure the demand of raw coke oven gas treatment system industrialization.
2. in an embodiment of underground gasification method of the present invention, be stored into combustion dummy cell after adopting the presser unit being positioned at more than ground to compress raw coke oven gas as cushion gas, can ensure that cushion gas has certain pressure to prevent the burned out area being in underground and caves in or shrinkage strain; The pressure of cushion gas preferably a little less than the hydrostatic pressure of the underground water near combustion dummy cell like this except preventing cushion gas loss, the poisonous and harmful substances such as the hydrogen sulfide had in cushion gas, hydroxyl sulphur, tar also can not cause groundwater pollution.
3. in an embodiment of underground gasification method of the present invention, using the burned out area that formed after the descending coal seam gasification early place as the gas that stores for future use, take full advantage of the large space advantage of burned out area, in addition because the temperature of raw coke oven gas can reach 200 DEG C to more than 300 DEG C usually, in combustion dummy cell, residual coal will synthesize the methane of a part at this temperature with the water in raw coke oven gas, carbon monoxide, carbon dioxide, to improve the clean energy degree of raw coke oven gas.
4. in an embodiment of underground gasification method of the present invention, the catalyzer of methanation reaction is put in burned out area, as nickel-base catalyst, noble metal catalyst, can make like this coal residual in combustion dummy cell as much as possible with the water in raw coke oven gas, carbon monoxide, carbon dioxide will synthesizing methanes, to improve the clean energy degree of raw coke oven gas, simultaneously by the residual coal gasification in part burned out area.
5, in an embodiment of underground gasification method of the present invention, combustion dummy cell more burned out area can be set to store the raw coke oven gas of different cultivars for cushion gas, as store respectively combustible gas percent by volume be 40%, 45%, 55%, 60%, 65%, 70% raw coke oven gas be cushion gas.Different cushion gas can be selected to mix with it, to ensure the industrialization demand of raw coke oven gas treatment system fully when the combustible gas percent by volume of the output of gasification furnace or the raw coke oven gas of manufacture is different like this.
The above, it is only preferred embodiment of the present invention, not any pro forma restriction is done to the present invention, although the present invention discloses as above with preferred embodiment, but and be not used to limit the present invention, any those skilled in the art, do not departing within the scope of technical solution of the present invention, make a little change when the technology contents of above-mentioned announcement can be utilized or be modified to the Equivalent embodiments of equivalent variations, in every case be do not depart from technical solution of the present invention content, according to any simple modification that technical spirit of the present invention is done above embodiment, equivalent variations and modification, all still belong in the scope of technical solution of the present invention.
Claims (10)
1. a underground gasification method, it is characterized in that, at combustion dummy cell (11) the internal memory storage cushion gas that gasification is complete, at the raw coke oven gas that current gasification unit (13) produces in underproduce or raw coke oven gas combustible gas percent by volume and described predetermined value inconsistent time, the raw coke oven gas that current gasification unit (13) gasifies is mixed with described cushion gas, amasss to raw coke oven gas treatment system transporting combustible gases the raw coke oven gas that percentage meets described predetermined value in order to what continue.
2. underground gasification method as claimed in claim 1, it is characterized in that, described predetermined value is that the combustible gas percent by volume of described raw coke oven gas treatment system Production requirement fluctuates 2%.
3. underground gasification method as claimed in claim 1, it is characterized in that, described cushion gas carrys out the raw coke oven gas that the arbitrary or any combination in the complete gasification unit of autopneumatolysis, current gasification unit (13), on the ground gasification unit (17) is produced.
4. underground gasification method as claimed in claim 1, is characterized in that, described cushion gas is concentrated and stored or store according to different combustible gas percent by volume subdivision in described combustion dummy cell (11).
5. underground gasification method as claimed in claim 1, is characterized in that, the gas pressure of described cushion gas is a little less than the hydrostatic pressure of the underground water at described combustion dummy cell (11) place.
6. underground gasification method as claimed in claim 1, it is characterized in that, the temperature of the cushion gas in described combustion dummy cell (11) is more than 200 DEG C.
7. underground gasification method as claimed in claim 1, it is characterized in that, described combustible gas comprises hydrogen, carbon monoxide and methane.
8. a underground gasification system (10), it is raw coke oven gas for the follow-up subterranean coal (300) that gasifies, and raw coke oven gas is supplied raw coke oven gas treatment system (20), described underground gasification system (10) comprises gasification unit (13), it is characterized in that, described underground gasification system (10) also comprises the combustion dummy cell (11) be communicated with described gasification unit (13), stores cushion gas in described combustion dummy cell (11).
9. underground gasification system (10) as claimed in claim 8, it is characterized in that, between described gasification unit (13) and described combustion dummy cell (11), be provided with the presser unit (15) for increasing described cushion gas air pressure.
10. underground gasification system (10) as claimed in claim 8, it is characterized in that, described combustion dummy cell (11) comprises the burned out area (111,112 of multiple cushion gas for storing different combustible gas percent by volume, 113,114).
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| 李文军: "煤炭地下气化联合循环发电系统及煤气热值的调配方法", 《山西能源与节能》 * |
| 李贤良: "中国地下储气库的发展驱动力", 《内蒙古石油化工》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110454134A (en) * | 2019-09-05 | 2019-11-15 | 湖南科技大学 | A kind of method of underground raw coal gasification |
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