CN103742122B - Underground coal gasification system and gasification process - Google Patents
Underground coal gasification system and gasification process Download PDFInfo
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- CN103742122B CN103742122B CN201410042521.3A CN201410042521A CN103742122B CN 103742122 B CN103742122 B CN 103742122B CN 201410042521 A CN201410042521 A CN 201410042521A CN 103742122 B CN103742122 B CN 103742122B
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Abstract
The invention provides a kind of underground coal gasification system and gasification process.Underground coal gasification system includes：First passage in coal seam, two ends are respectively communicated with venthole and via hole, and second channel, two ends are respectively communicated with via hole and directional hole, and combustion adjuvant is passed through by directional hole, and second channel forms reverse insertion area, gasifying agent is passed through by via hole, first passage forms positive gasification zone.It can make the underground coal gasification system and gasification process of reverse insertion process progress synchronous with positive gasification it is an object of the invention to provide a kind of.
Description
Technical field
The present invention relates to underground coal gasification(UCG) field, more particularly, to a kind of underground coal gasification system and gasification side
Method.
Background technology
Underground coal gasification(UCG) is exactly that the coal in underground is carried out into controlled burning, in heat and physics chemical action
Under, combustible component is produced, the technical process on ground is transported to.No-shaft underground gasification stove is by means of being drilled from ground to coal seam
Hole, and along formed by coal seam directional drilling developing gasification tunnel between drilling.
Reverse insertion and positive gasification are divided into according to gasification face move mode difference.Reverse insertion be exactly by air or
Low concentration is oxygen-enriched to make combustion adjuvant, and flame range is sent to by directional hole or cracks in coal seam with low speed, makes flame face edge and air-flow stream
Dynamic direction movement in opposite direction, it is main under low-temperature burning to produce CO2With the water evaporation made in coal seam into vapor, the process
For orienting horizontal hole path extension.Forward direction gasification is exactly that air or high concentration is oxygen-enriched as gasifying agent, is injected with high flow capacity
Flame range, makes flame face along being moved with air current flow direction identical direction, zoneofoxidation, reduction is formed under high-temp combustion
Area, dry distillation zone, the process are used to produce.
Patent No. ZL200810119354.2 patent discloses a kind of no-shaft UCG technique, which describes a kind of profit
Extend the method for gasification tunnel paragraph by paragraph with via hole reverse burning.Its shortcoming is:First, using the side gasified after first insertion
Formula, causes gasification furnace long up to the production time；Secondly, during insertion section, other non-through passages are also easy to produce shrinkage cavity；Again, insertion
The vapor produced in journey can not be used effectively, and reduce gasification efficiency.
The content of the invention
For problem present in correlation technique, it is an object of the invention to provide one kind can make reverse insertion process with
Underground coal gasification system and gasification process that positive gasification is synchronously carried out.
To achieve the above object, the invention provides a kind of underground coal gasification system, it includes：In coal seam
One passage, two ends are respectively communicated with venthole and via hole, and second channel, and two ends are respectively communicated with via hole and directional hole, by
Directional hole is passed through combustion adjuvant, and second channel forms reverse insertion area, and gasifying agent is passed through by via hole, and first passage forms positive gas
Change area.
Preferably, in addition to directional hole the combustion adjuvant input unit connected, and connected with directional hole and via hole
Gasifying agent input unit.
Preferably, combustion adjuvant input unit connects the first adjusting means, and the first adjusting means adjusts the volume flow of combustion adjuvant
Amount and pressure；And gasifying agent input unit connects the second adjusting means, the second adjusting means adjusts the volume flow of gasifying agent
And pressure.
A kind of coal underground gasification method is provided according to another aspect of the present invention, including：Build venthole, orientation
Hole, via hole, the first passage of connection venthole and via hole, the second channel for connecting via hole and directional hole；By via hole
It is passed through gasifying agent and positive gasification is carried out to first passage, second channel is inversely passed through while being passed through combustion adjuvant by directional hole
It is logical.
Preferably, also include after the completion of structure：Lighted a fire in venthole and first passage connectivity part；It is passed through to directional hole combustion-supporting
Agent carries out reverse insertion to first passage, after the completion of first passage insertion, is passed through gasifying agent by via hole and first passage is entered
The positive gasification of row, while be passed through combustion adjuvant to directional hole carries out reverse insertion to second channel.
Preferably, when the gas concentration lwevel in the outlet at via hole is more than first predetermined value, first passage is judged
Insertion is completed.
Preferably, after first passage forward direction gasification terminates, gasifying agent is passed through by directional hole second channel is gasified.
Preferably, when gas concentration lwevel is more than second predetermined value at directional hole, first passage forward direction gasification knot is judged
Beam.
Preferably, first predetermined value and second predetermined value are 10%.
Preferably, the volume flow of gasifying agent is more than five times of the volume flow of combustion adjuvant, and combustion adjuvant pressure is more than gas
Agent pressure.
Preferably, the volume flow of combustion adjuvant is 600~1200Nm3/ h, the volume flow of gasifying agent for 3000~
8000Nm3/h。
The advantageous effects of the present invention are：By technical scheme, reverse insertion process and forward direction can be made
Gasification is synchronously carried out, and shortens gasification furnace up to the production time.Meanwhile, combustion adjuvant passes through whole gasification tunnel, thus can avoid
There is shrinkage cavity.Further, since vapor and carbon dioxide that reverse insertion process is produced directly are sent to the oxidation of gasification production district
Area and reducing zone, this is conducive to controlling the temperature of zoneofoxidation and improves the active principle in coal gas；It should further be appreciated that above-mentioned water steams
Gas and carbon dioxide are used for zoneofoxidation and reducing zone, also reduce quantity of wastewater effluent, are conducive to environmental protection.
Brief description of the drawings
Fig. 1 is the schematic diagram of one embodiment of the underground coal gasification system of the present invention.
Embodiment
Fig. 1 shows the schematic diagram of one embodiment of the underground coal gasification system of the present invention.As illustrated, showing
A kind of underground coal gasification system.The system includes the first passage 111 being located in coal seam 17, the two ends of first passage 111 difference
Connect venthole 12 and via hole 11；Also include second channel 112, the two ends of second channel 112 are respectively communicated with via hole 11 and fixed
To hole 10.Combustion adjuvant is passed through by directional hole 10, so that second channel 112 forms reverse insertion area；Gas is passed through by via hole 11
Agent, so that first passage 111 forms positive gasification zone.
The position of venthole 12, via hole 11 and directional hole 10 is arranged according to the position relationship shown in Fig. 1.Therefore, first
Passage 111 is sequentially connected with second channel 112.Reverse insertion process and positive gasification are identical with described in background technology.Help
The flow direction for firing agent is that, from directional hole 10 to the direction of venthole 12, and the moving direction of insertion flame face is from outlet
Hole 12 is towards the direction of directional hole 10.In positive gasification, the flow direction of gasifying agent be from via hole 11 to venthole 12, or from
Directional hole 10 is to via hole 11, and flowing to for the moving direction of the flame face that gasifies and gasifying agent is identical.
, can be simultaneously to first passage when carrying out reverse insertion to second channel 112 by technical scheme
111 carry out positive gasification.Because reverse insertion process can occur with positive gasification simultaneously, therefore, compared to first by passage
Completely through situation about being gasified again, it can shorten up to the production time, i.e. the whole mistake that production is reached since insertion process can be reduced
Cheng Suoxu time.Simultaneously as combustion adjuvant is entered by directional hole 10, therefore, it can flow through second channel 112, while can flow
First passage 111 is crossed, therefore compared with first insertion the first passage 111 again situation of insertion second channel 112, it is possible to decrease directional hole
10 occur the possibility of shrinkage cavity.Further, since the carbon dioxide and vapor that are produced during the insertion of second channel 112 need to be worn
Cross first passage 111 to flow out, these carbon dioxide and vapor can promote gasification reaction forward direction progress, so can not only reduce temperature
Degree is to prevent coal seam from overheating, due also to promoting the content that forward reaction carries out and improves the active principle in coal gas；Except this
Outside, because carbon dioxide and vapor are used for above-mentioned gasification, thus help to reduce the discharge capacity of sewage, can so promote
Enter environmental protection.
Venthole 12 can selectively be connected with blast pipe or generating tube, so that discharge the insertion stage of first passage 111
Exhaust, or discharge the aerogenesis of the aerogenesis of the gasifying stage of first passage 111 or the gasifying stage of second channel 112.Via hole
11 can connect with gasifying agent input unit, so as to input gasifying agent in the gasification of first passage 111.Directional hole 10 can be with
Combustion adjuvant input unit is connected, so that combustion adjuvant is constantly provided for whole insertion process, meanwhile, the directional hole 10 can also be with gas
Agent input unit is selectively connected, so as to during the gasification of second channel 112, be supplied by directional hole 10 for the process
Gasifying agent.
First flow regulating valve 9 controls the amount for the gasifying agent being passed through in via hole 11, and the control of second flow regulating valve 7 is passed through
The amount of the combustion adjuvant of directional hole 10, the 3rd flow control valve 8 control is passed through the amount of the gasifying agent of directional hole 10.Second flow is adjusted
The flow control valve 8 of valve 7 and the 3rd is interlocked relationship.In the present embodiment, gasifying agent and combustion adjuvant are air A, simply because dividing
Not Yong Yu gasification and insertion process and be expressed as gasifying agent and combustion adjuvant respectively for clarity.Those skilled in the art
It should be appreciated that than air, gasifying agent and combustion adjuvant can be other suitable gases, and such as combustion adjuvant is relatively low lazy of oxygen content
Property gas, gasifying agent is the higher inert gas of oxygen content.
The gasification system may also include the first adjusting means for directional hole 10, being connected with combustion adjuvant input unit.
The adjusting means includes the 4th flow control valve 1 and pressure regulator 2, is respectively used to adjust the volume flow and pressure of combustion adjuvant.Class
As, the gasification system may also include the second adjusting means for via hole 11, being connected with gasifying agent input unit, and it is wrapped
The 5th flow control valve 3 and pressure regulator 6 are included, is respectively used to adjust the volume flow and pressure of gasifying agent.By means of above-mentioned two
Adjusting means（First adjusting means and the second adjusting means）, it is ensured that the volume flow ratio of gasifying agent and combustion adjuvant, pressure ratio
Appropriately, it is preferable that the volume flow of gasifying agent is adjusted to at least 5 times of the volume flow of combustion adjuvant, and by combustion adjuvant pressure
It is adjusted to be more than gasifying agent pressure, is carried out so as to realize that reverse insertion process is synchronous with positive gasification.Preferably, combustion adjuvant
Volume flow be 600~1200Nm3/ h, the volume flow of gasifying agent is 3000~8000Nm3/h。
Gasification system may also include apparatus of oxygen supply.As shown in figure 1, the apparatus of oxygen supply may include the He of the 6th flow control valve 4
Blender 5, so that when the 6th flow control valve 4 is opened, appropriate oxygen is passed through into blender 5, and make oxygen in blender 5
In mixed with flowing through the air of the 5th flow control valve 3, the gasifying agent of the mixing afterwards, which flows into via hole 11, is used for first passage
Gasification.In addition, oxygen-the air mixture can also be used for the gasification of second channel by the 3rd flow control valve 8.
In addition, the coal gasification systems may also include sampling detector for multifunctional, and the detection means can be customary in the art
Gas courage or infrared detection device.During the insertion of first passage 111, the sampling detector for multifunctional can be used for detection via hole
The concentration of the carbon dioxide in outlet at 11, when its concentration exceedes first predetermined value, the controller of control device（Valve）
Via hole 11 is set to be connected with gasifying agent input unit, so as to input gasifying agent into via hole 11.When testing result is equal to or low
When first predetermined value, the working condition before detection is maintained.Similarly, the gas that the detection means can be additionally used in directional hole 10
The detection of body.Specifically, after the gasification of first passage 111 terminates, two in gas at detection means detection directional hole 10
The concentration of carbonoxide, when its concentration exceedes second predetermined value, control device is closed the 4th flow control valve 1, second flow and adjusted
Valve 7, first flow regulating valve 9 are saved, and opens the 3rd flow control valve 8, to be passed through gasifying agent into directional hole 10, so as to the
Two passages 112 are gasified.Similarly, when the testing result in directional hole 10 is equal to or less than second predetermined value, inspection is maintained
Working condition before survey.In this embodiment, first predetermined value and second predetermined value are 10%.
Present invention also offers a kind of coal gasification process.One embodiment of this method includes：Build venthole 12, determine
To hole 10 and via hole 11, and build the first passage 111 of connection venthole 12 and via hole 11 and connect the He of via hole 11
The second channel 112 of directional hole 10.Afterwards, gasifying agent is passed through by via hole 11 and positive gasification is carried out to first passage 111, simultaneously
Combustion adjuvant is passed through by directional hole 10 reverse insertion is carried out to second channel 112.
By the above method, the reverse insertion process of second channel 112 and the positive gasification of first passage 111 can be made
Carry out simultaneously, and realize above-mentioned further advantage.Meanwhile, reverse insertion process and positive gasification are same above with reference to coal
Described in underground gasification system.After the completion of the building process in above-mentioned passage and hole, in the connection of venthole 12 and first passage 111
Place's igniting, and reverse insertion is carried out to first passage 111 by the input combustion adjuvant of directional hole 10, so as to form igniting row or light a fire
Area 14.Afterwards, the gas outlet of via hole 11 is opened, the gas sample in via hole 11 is detected, the titanium dioxide in the gas
When concentration of carbon is more than first predetermined value, the gas outlet of via hole 11 is closed, the air inlet of via hole 11 is opened, into via hole 11
Introduce gasifying agent.The volume flow of gasifying agent is adjusted to more than five times of the volume flow of combustion adjuvant, combustion adjuvant pressure is adjusted
Whole is more than gasifying agent pressure, to ensure positive gasification and the same stepping of reverse insertion of second channel 112 to first passage 111
OK.When the gas concentration lwevel in the gas is less than or equal to first predetermined value, the working condition before detection is maintained.With it is above-mentioned
Detection method to the gas in via hole 11 is similar, when the gas concentration lwevel at directional hole 10 is more than second predetermined value,
Judge that the positive gasification of first passage 111 terminates, gasifying agent is now passed through by directional hole 10, so as to second channel 112
Gasified.When gas concentration lwevel at directional hole 10 is less than or equal to second predetermined value, the work shape before detection is maintained
State.
Specifically, by the decentralization pressurization control water spot firearm of venthole 12, coal seam 17 is lighted, and open the 4th Flow-rate adjustment
Valve 1 and second flow regulating valve 7 by directional hole 10 to be passed through combustion adjuvant, when coal combustion is to one fixed width, you can is formed
Igniting row or seed region 14.As it is well known to the skilled in the art, above-mentioned width can be based on amount, the coal seam for being passed through combustion adjuvant
Thickness etc. is calculated and obtained.The flow of combustion adjuvant is adjusted, in one embodiment, its volume flow can be adjusted to 600~
1200Nm3/ h, and pass through the pressure of pressure regulator adjustment combustion adjuvant, the length change of the passage of pressure insertion as needed.
The venthole of via hole 11 is periodically turned on to the sampling analysis of via hole 11, when the concentration of carbon dioxide in gas sample is big
When first predetermined value, that is, illustrate that the flame face of insertion process has passed past via hole 11.In this example, first predetermined value
For 10%.And when flame face has passed past via hole 11, you can close venthole and open the air admission hole of via hole 11, from
And supply gasifying agent into via hole 11.And when testing result is equal to or less than first predetermined value, maintain the work before detection
State.Specifically, when detected value is more than 10%, the 5th flow control valve 3 and first flow regulating valve 9 shown in Fig. 1 are opened,
Gasifying agent is passed through by via hole 11.5th flow control valve 3 and first flow regulating valve 9 to adjust the volume flow of gasifying agent,
In an example, the volume flow can be adjusted to 3000~8000Nm3/ h, i.e., will keep the air inflow in via hole 11 to be
More than 5 times of air inflow in directional hole 10, so as to realize via hole 11 to the forward direction gasification of the gasification chamber between venthole 12
Process.Meanwhile, the pressure of combustion adjuvant and gasifying agent is adjusted according to insertion degree and gasification degree etc., and keep combustion adjuvant pressure big
In gasifying agent pressure, so as to keep reverse insertion to be carried out with positive gasification simultaneously.That is, gasification zone 15 and reverse insertion flame range are kept
Reaction in 16 is synchronously carried out.
To improve the active ingredient and calorific value in coal gas, oxygen B can be added into gasifying agent.As shown in figure 1, opening the 6th
Flow control valve 4, so that oxygen is mixed with air in blender 5, and then goes through in via hole 11.
, can be to the gas-sample analysis in directional hole, with true at the end of the gasification reaction between venthole and via hole
Whether fixed gas concentration lwevel therein is more than second predetermined value.As it is well known to the skilled in the art, above-mentioned reaction knot
Beam process can the length computation based on the second channel between gas production, coal seam thickness, coal seam width and venthole and via hole
Obtain.When above-mentioned gas concentration lwevel is more than second predetermined value, the 4th flow control valve 1 and second flow regulating valve 7 are closed,
The 3rd flow control valve 8 is opened, so that gasifying agent is passed through into directional hole, so as to gasify to second channel.Similarly, when
When testing result is equal to or less than 10%, the working condition before detection is maintained.In this example, second predetermined value is 10%.As above
It is described, equally it can add oxygen into the gasifying agent.
The preferred embodiments of the present invention are the foregoing is only, are not intended to limit the invention, for the skill of this area
For art personnel, the present invention can have various modifications and variations.Within the spirit and principles of the invention, that is made any repaiies
Change, equivalent substitution, improvement etc., should be included in the scope of the protection.
Claims (12)
1. a kind of underground coal gasification system, including：First passage (111) in coal seam, two ends are respectively communicated with venthole
(12) and via hole (11), and second channel (112), two ends are respectively communicated with via hole (11) and directional hole (10), its feature
It is, be passed through combustion adjuvant by directional hole (10), the combustion adjuvant flows into the second channel (112), the second channel (112)
Reverse insertion area is formed, while the combustion adjuvant also flows into the first passage (111), gasifying agent is passed through by via hole (11),
The first passage (111) forms positive gasification zone.
2. underground coal gasification system according to claim 1, it is characterised in that also including connecting with the directional hole (10)
Logical combustion adjuvant input unit, and the gasifying agent input unit connected with directional hole (10) and via hole (11).
3. underground coal gasification system according to claim 2, it is characterised in that the combustion adjuvant input unit connection the
One adjusting means, first adjusting means adjusts the volume flow and pressure of the combustion adjuvant；And the gasifying agent input
Device connects the second adjusting means, and second adjusting means adjusts the volume flow and pressure of the gasifying agent.
4. a kind of coal underground gasification method, it is characterised in that including：
Build the first of venthole (12), directional hole (10), via hole (11), the connection venthole (12) and via hole (11)
The second channel (112) of passage (111), the connection via hole (11) and directional hole (10)；
Gasifying agent is passed through by via hole (11) positive gasification is carried out to the first passage (111), while logical by directional hole (10)
Enter combustion adjuvant, the combustion adjuvant flows into second channel (112) to carry out reverse insertion to the second channel (112), while institute
State combustion adjuvant and also flow into the first passage (111).
5. coal underground gasification method according to claim 4, it is characterised in that also include after the completion of structure：
Lighted a fire in the venthole (12) and the first passage (111) connectivity part；
Combustion adjuvant is passed through to the directional hole (10) reverse insertion is carried out to the first passage (111), when the first passage
(111) after the completion of insertion, gasifying agent is passed through by via hole (11) positive gasification is carried out to the first passage (111), while to
The directional hole (10) is passed through combustion adjuvant and carries out reverse insertion to second channel (112).
6. coal underground gasification method according to claim 5, it is characterised in that the outlet at the via hole (11) place
In gas concentration lwevel be more than first predetermined value when, judge the first passage (111) insertion completion.
7. coal underground gasification method according to claim 6, it is characterised in that the first predetermined value is 10%.
8. coal underground gasification method according to claim 4, it is characterised in that when the first passage (111) is positive
After gasification terminates, gasifying agent is passed through by the directional hole (10) second channel (112) is gasified.
9. coal underground gasification method according to claim 8, it is characterised in that in the directional hole (10) place titanium dioxide
When concentration of carbon is more than second predetermined value, judge that the first passage (111) forward direction gasification terminates.
10. coal underground gasification method according to claim 9, it is characterised in that the second predetermined value is 10%.
11. coal underground gasification method according to claim 4, it is characterised in that the volume flow of gasifying agent is combustion-supporting
More than five times of the volume flow of agent, combustion adjuvant pressure is more than gasifying agent pressure.
12. coal underground gasification method according to claim 11, it is characterised in that the volume flow of the combustion adjuvant is
600~1200Nm3/ h, the volume flow of the gasifying agent is 3000~8000Nm3/h。
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| CN103953320B (en) * | 2014-05-12 | 2017-03-15 | 新奥科技发展有限公司 | Underground gasification furnace water control method |
| CN104088588B (en) * | 2014-06-24 | 2016-06-08 | 新奥气化采煤有限公司 | A kind of underground coal gasification sleeve pipe and underground coal gasification inlet, outlet pore structure |
| CN104088617B (en) * | 2014-06-24 | 2016-08-03 | 新奥气化采煤有限公司 | A kind of underground coal gasification(UCG) inlet, outlet pore structure |
| CN104653167B (en) * | 2015-02-06 | 2018-08-03 | 新奥科技发展有限公司 | A kind of underground gasification furnace and its gasification process |
| CN104612653B (en) * | 2015-02-11 | 2017-11-03 | 新奥科技发展有限公司 | A kind of underground gasification method |
| CN106121618B (en) * | 2016-08-24 | 2019-01-08 | 中为(上海)能源技术有限公司 | For the oxidant injection device of Underground Coal Gasification Process and its application |
| CN107269256B (en) * | 2017-08-07 | 2023-02-28 | 新疆国利衡清洁能源科技有限公司 | Underground coal gasification filling wellhead device |
| CN107339092A (en) * | 2017-08-07 | 2017-11-10 | 新疆国利衡清洁能源科技有限公司 | Underground coal gasification(UCG) monitoring system |
| CN109356813A (en) * | 2018-11-01 | 2019-02-19 | 中国石油天然气股份有限公司 | A kind of underground compressed air energy storage and underground gasification combined system and method |
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| CN101382065A (en) * | 2008-09-04 | 2009-03-11 | 乌兰察布新奥气化采煤技术有限公司 | No-shaft underground gasification process |
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| US4092052A (en) * | 1977-04-18 | 1978-05-30 | In Situ Technology, Inc. | Converting underground coal fires into commercial products |
| CN102477857B (en) * | 2010-11-30 | 2015-06-03 | 新奥气化采煤有限公司 | Passage formation method for underground coal gasification |
| WO2013090979A1 (en) * | 2011-12-21 | 2013-06-27 | Linc Energy Ltd | Ucg product gas quenching method and apparatus |
| CN103437748B (en) * | 2013-09-04 | 2016-08-10 | 新奥气化采煤有限公司 | Coal underground gasifying furnace and coal underground gasification method |
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| CN101382065A (en) * | 2008-09-04 | 2009-03-11 | 乌兰察布新奥气化采煤技术有限公司 | No-shaft underground gasification process |
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Effective date of registration: 20170215 Address after: The 065001 Hebei economic and Technological Development Zone of Langfang Huaxiang new Austrian Science and Technology Park in the Southern District of B City Applicant after: ENN SCIENCE & TECHNOLOGY DEVELOPMENT Co.,Ltd. Address before: 065001 Langfang City Development Zone of Hebei province Huaxiang Applicant before: ENN Coal Gasification Co., Ltd. |
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