CN112483062B - Underground interlayer type coal in-situ gasification mining method and system - Google Patents
Underground interlayer type coal in-situ gasification mining method and system Download PDFInfo
- Publication number
- CN112483062B CN112483062B CN202011496001.1A CN202011496001A CN112483062B CN 112483062 B CN112483062 B CN 112483062B CN 202011496001 A CN202011496001 A CN 202011496001A CN 112483062 B CN112483062 B CN 112483062B
- Authority
- CN
- China
- Prior art keywords
- coal
- heating
- wells
- gas
- well
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 239000003245 coal Substances 0.000 title claims abstract description 138
- 238000002309 gasification Methods 0.000 title claims abstract description 55
- 238000005065 mining Methods 0.000 title claims abstract description 40
- 238000000034 method Methods 0.000 title claims abstract description 34
- 238000011065 in-situ storage Methods 0.000 title claims abstract description 31
- 239000011229 interlayer Substances 0.000 title claims abstract description 24
- 238000010438 heat treatment Methods 0.000 claims description 96
- 238000004519 manufacturing process Methods 0.000 claims description 65
- 239000010410 layer Substances 0.000 claims description 60
- 239000011435 rock Substances 0.000 claims description 36
- 238000000197 pyrolysis Methods 0.000 claims description 21
- 239000003054 catalyst Substances 0.000 claims description 15
- 238000006243 chemical reaction Methods 0.000 claims description 8
- 238000000926 separation method Methods 0.000 claims description 8
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims description 6
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 6
- 238000005553 drilling Methods 0.000 claims description 6
- 239000002131 composite material Substances 0.000 claims description 4
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical group [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 claims description 3
- 229910002092 carbon dioxide Inorganic materials 0.000 claims description 3
- 239000001569 carbon dioxide Substances 0.000 claims description 3
- 238000011156 evaluation Methods 0.000 claims description 3
- 229910052742 iron Inorganic materials 0.000 claims description 3
- 229910052700 potassium Inorganic materials 0.000 claims description 3
- 239000011591 potassium Substances 0.000 claims description 3
- 230000008569 process Effects 0.000 abstract description 8
- 239000007789 gas Substances 0.000 description 63
- 238000000605 extraction Methods 0.000 description 5
- 230000008859 change Effects 0.000 description 4
- 238000000354 decomposition reaction Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 239000003034 coal gas Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000007789 sealing Methods 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 230000006866 deterioration Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000003912 environmental pollution Methods 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- 238000004227 thermal cracking Methods 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 208000028571 Occupational disease Diseases 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000005485 electric heating Methods 0.000 description 1
- -1 electric power Substances 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Images
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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
- B01J23/70—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the iron group metals or copper
- B01J23/76—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the iron group metals or copper combined with metals, oxides or hydroxides provided for in groups B01J23/02 - B01J23/36
- B01J23/78—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the iron group metals or copper combined with metals, oxides or hydroxides provided for in groups B01J23/02 - B01J23/36 with alkali- or alkaline earth metals
-
- 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
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
- E21B43/24—Enhanced recovery methods for obtaining hydrocarbons using heat, e.g. steam injection
Landscapes
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Chemical & Material Sciences (AREA)
- Fluid Mechanics (AREA)
- Environmental & Geological Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Physics & Mathematics (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Processing Of Solid Wastes (AREA)
- Production Of Liquid Hydrocarbon Mixture For Refining Petroleum (AREA)
Abstract
The invention belongs to the technical field of underground coal gasification, and particularly relates to an underground interlayer type coal in-situ gasification mining method and system. The method aims to not directly treat the coal bed, reduce mining disturbance to the in-situ coal bed and improve the safety of the mining process; and the coal bed is heated more uniformly, and the gasification efficiency is higher.
Description
Technical Field
The invention belongs to the technical field of underground coal gasification, and particularly relates to an underground interlayer type coal in-situ gasification mining method and system.
Background
The traditional underground in-situ coal gasification technology is a process of performing controlled combustion on underground coal and generating combustible gas through the thermal action and chemical action of the coal. The method integrates three processes of well building, coal mining and gasification, changes the traditional physical coal mining into chemical coal mining, changes the traditional mechanical coal mining into unmanned gas mining, and has the advantages of short mining flow, low cost, low pollution discharge, high resource recovery rate and the like, thereby improving the utilization value of coal, promoting the mining of coal seams which are difficult to mine and low-grade coal seams, and driving the development of traditional industries such as coal, electric power, chemical industry and the like.
Currently, the existing underground in-situ coal gasification technical scheme includes three types: (1) The coal underground gasification technology adopting the long-wall airflow method has relatively long gasification channels, and the channels are easy to block, thereby affecting the stability and the coal gas yield of the gasification process and being easy to cause safety accidents; the movement of the working surface depends on natural propulsion, the controllability is poor, and the productivity is low; (2) The underground coal gasification technology has short gasification channel, small diameter, large air supply resistance, small gas production rate of a single working face, incapability of extracting different pyrolysis gases in a quality-based and grading manner and low energy extraction rate; the service time is short, and a plurality of drill holes must be arranged in a chessboard manner to achieve the industrial production scale, so that the waste of land resources is caused; the industrial gasification furnace has high furnace building and operating cost and is not suitable for large-scale gasification production of deep coal beds; (3) The underground coal gasification technology for controlling the retreating gas injection point has the advantages that a coal bed is generally below hundreds of meters or even kilometers underground, solid coal with high carbon content is generally converted into gasification energy with high hydrogen content, a gasification agent is generally added, and a common gasification agent is difficult to participate in gasification reaction after reaching the underground, so that the gasification efficiency is reduced; the gas injection nozzle is easy to damage at high temperature, and the gas production rate is lower.
Disclosure of Invention
In order to solve the problems of large energy loss, uneven heating of a coal bed, poor tightness, and continuous expansion along with the gasification process in the coal gasification, the deterioration of contact conditions of oxygen and coal, which leads to the reduction of effective components in outlet coal gas and the deterioration of coal gas quality, the invention provides an underground interlayer type coal in-situ gasification mining method and a system, and the adopted technical scheme is as follows:
an underground interlayer type coal in-situ gasification mining method comprises the following steps:
1) Evaluating the area of underground coal to be mined, determining the digging position of a heating well on the ground according to an evaluation result, and drilling a plurality of heating wells from the ground to the underground, wherein the bottom of each heating well is positioned below a coal layer, and the area formed by surrounding the plurality of heating wells covers the area of the coal to be mined;
2) Drilling two production wells from the ground to the underground, wherein the bottoms of the production wells are positioned above a coal layer, and the two production wells are positioned in an area formed by surrounding a plurality of heating wells;
3) A gas collection lane is excavated between the bottoms of the two production wells along the direction of the coal layer, and a plurality of gas collection holes communicated with the coal layer are arranged in the gas collection lane;
4) Heating is carried out through the bottom of the heating well, heat is transferred to the coal layer through a bottom plate rock stratum around the heating well, and the heating temperature is controlled through a ground heat control system;
5) The coal layer is heated by the interlayer and then undergoes a pyrolysis reaction, and gaseous products generated after the reaction are collected in a gas collection roadway through the gas collection holes;
6) And injecting drainage gas into one of the production wells on the ground, enabling the drainage gas to flow through the gas collecting lane, bringing the pyrolyzed gaseous product to a separation system on the ground through the other production well, and storing the gaseous product after separation.
Preferably, the vertical distance from the bottom of the heating well to the coal layer is 100-1000 m.
Preferably, the number of the heating wells is four, the four heating wells surround to form a quadrangle, and the distance between every two adjacent heating wells is 100-500 m.
Preferably, each production well is positioned on a connecting line of two adjacent heating wells, and the two production wells are symmetrically arranged by the center of a quadrangle formed by the surrounding of four heating wells.
Preferably, the bottom of the production well is positioned at the elevation position of the top plate of the coal seam.
Preferably, before heating, injecting a gasification catalyst, which is a potassium-based catalyst, an iron-based catalyst, a composite catalyst consisting of 5% KOH and 3% CaO, into the char layer through the gas collection holes; the drainage gas is high-temperature steam and supercritical carbon dioxide.
Preferably, the heating in step 4) is performed through the bottom of the heating well, in which the ground heat control system delivers the combustible gas with high heat value to the bottom of the heating well, and the bottom rock around the heating well is heated after the combustible gas is ignited.
Preferably, the ground heat control system in step 4) includes a monitoring center disposed on the ground, and the monitoring center controls the heating time and the heating temperature through thermocouples and pressure sensors disposed on the floor rock layer and the coal layer.
Preferably, the thermocouples are respectively installed at the bottom floor rock layer and the top plate of the coal layer.
An underground interlayer type coal in-situ gasification mining unit circulation system comprises four heating wells, two production wells and a gas collection lane, wherein the bottom of each heating well is positioned on a bottom plate rock layer below an underground coal layer, the bottom of each production well is positioned above the coal layer, the two production wells are communicated with each other to form the gas collection lane, and the gas collection lane is communicated with the coal layer; and in the two production wells, the well mouth of one production well is connected with a drainage gas inlet device, and the well mouth of the other production well is connected with a gas collecting device.
The invention has the following beneficial effects:
1) The disturbance to the in-situ coal bed is reduced, and the safety and the sealing performance are better. The method does not directly burn the coal bed, reduces mining disturbance to the in-situ coal bed, and has higher safety; the rock stratum covered with the coal seam at a certain depth is heated, the coal seam is not directly treated, the mining disturbance of the in-situ coal seam is reduced, and the safety of the mining process is improved; the heat transfer efficiency of the bottom floor rock stratum is exerted, heat is transferred to the coal bed, the thermal dry distillation decomposition of the coal bed is achieved, pyrolysis gas generated by the thermal dry distillation decomposition of the coal bed enters the gas collecting roadway and is conveyed back to the ground through the production well, and the sealing performance is better.
2) The heating temperature of the bottom floor rock stratum can be controlled, the temperature gradient change of the rock stratum is realized, finally, different pyrolysis gases in the coal bed are extracted in a quality-based grading mode, and the energy extraction rate is higher. The ground heating system realizes gradient change of the temperature of the rock stratum by controlling the heating temperature in real time, finally realizes different pyrolysis gases in the coal bed by quality classification, and has higher energy extraction rate.
3) The coal bed is heated more evenly, and the gasification efficiency is higher. According to the method, the rock stratum is heated by utilizing the characteristics of good thermal conductivity and difficulty in thermal cracking of the rock of the compact rock stratum, so that heat is uniformly conveyed to the coal bed, the coal bed is heated more uniformly, and the gasification efficiency is higher.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.
FIG. 1 is a schematic diagram of an underground coal in-situ gasification unit;
FIG. 2 is a schematic diagram of the layout of an underground interlayer type coal in-situ gasification space;
FIG. 3 is a schematic diagram of in-situ gasification of underground coal in a separate layer;
FIG. 4 is a plan view of underground coal in-situ gasification.
In the figure: 1-heating a well; 2-a production well; and 3-gas collection lane.
Detailed Description
The invention relates to an underground interlayer type coal in-situ gasification mining method and system, which take a coal layer in northwest regions as an example, is suitable for the situation that the rock stratum of the top floor and the bottom floor of a coal layer is compact and is not easy to be cracked or melted by heating, and particularly has wide application prospect in the mining and utilization aspects of coal layers with low quality, steep inclination and the like.
An underground interlayer type coal in-situ gasification mining method comprises the following steps:
1) Evaluating the area of underground coal to be mined, determining the digging position of a heating well 1 on the ground according to an evaluation result, and drilling a plurality of heating wells 1 from the ground to the underground, wherein the bottom of each heating well 1 is positioned in a rock stratum below a coal layer, and the area formed by surrounding the plurality of heating wells 1 covers the area of the coal to be mined; in a unit circulation system, the number of the heating wells 1 is preferably four, the four heating wells 1 surround to form a quadrangle, the quadrangle is a square, the distance between two adjacent heating wells 1 is 100-500 (specifically determined according to local coal layer geology and coal occurrence conditions), and the unit circulation system is preferably 250 meters; the bottom of the heating well 1 is located on a bottom plate rock stratum below a coal layer, and the vertical distance from the coal layer is L (the optimal L value is determined by performing indoor experimental research on factors such as the bottom plate lithology and the heat conduction property of the coal layer and according to the optimal heat transfer efficiency of the heated rock and the pyrolysis effect of the coal on the upper layer), and the vertical distance L is preferably 100-1000 m.
2) Drilling two production wells 2 from the ground to the underground, wherein the bottoms of the production wells 2 are positioned above a coal layer, and the two production wells 2 are positioned in an area surrounded by a plurality of heating wells 1; as shown in fig. 2, the heating wells 1 form a square shape with four total ports, and the production wells 2 are respectively located on the connecting line of the two heating wells 1 and symmetrically arranged with the center of the quadrangle formed by the heating wells 1 as the symmetric center; the bottom of the production well 2 is positioned at the elevation position of the top plate of the coal bed.
3) A gas collecting lane 3 is excavated between the bottoms of the two production wells 2 along the direction of the coal layer, and a plurality of gas collecting holes communicated with the coal layer are arranged in the gas collecting lane 3; when the system is not operating, injecting a coal gasification catalyst through the gas collection port, the catalyst being selected from potassium-based catalyst, iron-based catalyst, a composite catalyst consisting of 5% KOH by mass and 3% CaO by mass, the composite catalyst being preferred in the present invention, both of which promote the gasification reaction together, the gasification efficiency will increase by 30%, and the gasification activity will decrease if the amount of CaO is not excessively added; when the system starts to operate, gas generated by coal bed thermal dry distillation decomposition enters the gas collecting roadway 3 through the gas collecting hole and is conveyed back to the ground through the production well 2.
4) The bottom of the heating well 1 is heated, the heating temperature range is 150-300 ℃, the heating mode can adopt the existing electric heating or gas heating, the bottom of the heating well 1 is preferably heated by a ground heat control system, a combustible gas (mixed with a proper amount of oxygen) with a high heat value is conveyed to the bottoms of four heating wells 1, after the combustible gas is ignited, a bottom rock stratum around the heating well 1 is heated, the heat generated by the heating well 1 is continuously transferred upwards by taking the bottom rock stratum as a medium by utilizing the characteristics of better heat conductivity and difficult thermal cracking of compact rock strata, the heat is transferred to a coal layer through the bottom rock stratum around the heating well 1, the aim of thermal destructive distillation and decomposition of the coal layer is further fulfilled, the heating temperature is controlled by the ground heat control system, the gradient change of the rock stratum temperature is realized by controlling different heating temperatures, finally, the different pyrolysis gases in the coal layer are extracted by quality and grade, and the energy extraction rate is improved.
The ground heat control system comprises a monitoring center arranged on the ground, and the monitoring center controls heating time and heating temperature through thermocouples and pressure sensors arranged on a bottom plate rock stratum and a coal layer; in order to ensure the long-term safety of interlayer type in-situ gasification mining, thermocouples are arranged at the bottom plate rock stratum to be heated and the top plate of the coal layer and are used for monitoring the temperatures near the two places, and the monitoring center receives temperature signals through signal lines and judges the condition of a coal layer pyrolysis area by using the temperatures. In addition, temperature and pressure sensors are pre-embedded between rock layers (between the bottom plate rock layer and the coal layer), real-time monitoring is carried out on the underburden bottom plate rock layer, and the stability of the underburden bottom plate rock layer after long-time heating is monitored.
5) The coal layer is heated by the interlayer and then undergoes a pyrolysis reaction, and gaseous products generated after the reaction are collected in the gas collection lane 3 through the gas collection holes; because the gas collection lane 3 is communicated with the coal layer through the gas collection holes, the gas generated after the pyrolysis of the coal layer is collected in the gas collection lane 3.
6) Injecting drainage gas into one of the production wells 2 on the ground, wherein the density of the drainage gas is greater than that of pyrolysis gas generated after pyrolysis of a coal layer, the drainage gas can be selected from supercritical carbon dioxide and high-temperature steam, in the invention, the drainage gas is preferably high-temperature steam which does not cause environmental pollution and can avoid heat loss of pyrolysis products in the process of conveying the pyrolysis products back to the ground, the high-temperature steam flows through the gas collection lane 3, the pyrolyzed gaseous products are brought to a separation system on the ground through the other production well 2 and are stored after separation, effective separation of the gas and other organic matters is completed in the ground separation system, the gas is stored in a ground gas storage tank, and the separated other organic matters are stored in a liquid storage tank in an organic liquid mode and are used in other aspects.
In the method, for example, the mining of one unit circulation system is taken as an example, a plurality of unit circulation systems can be combined for production, so that the operation efficiency is improved, for example, in the figure 4, the number of the heating wells 1 is increased from four to six, the number of the production wells 2 is increased from two to three, and the numbers of the production wells are respectively heating well number 1, heating well number 2, heating well number 3, heating well number 4, heating well number 5 and heating well number 6; the production well 2 is numbered as production well A, production well B and production well C. Wherein, the heating well No. 1, the heating well No. 2, the heating well No. 3 and the heating well No. 4 are a unit circulating system, no. 3, no. 4, no. 5 and No. 6 of the heating well are second unit circulating systems; after the first unit circulation system finishes working, switching to a second unit circulation system, namely: the heating wells 3, 4, 5 and 6 heat the coal layer, high-temperature water vapor is injected from the production well C, and the high-temperature water vapor is transported to the ground from the production well B through the gas collection lane 3. When carrying out the second production circulation, seal production well A, prevent that pyrolysis gas from this well from overflowing, because No. 3 and No. 4 work of heater well in last circulation system, switch to next circulation system and continue during operation, sustainable heating work realizes self-loopa, raises the efficiency and practices thrift the cost.
An underground interlayer type coal in-situ gasification mining unit circulation system comprises four heating wells 1, two production wells 2 and a gas collection lane 3, and forms a unit circulation system, a plurality of unit circulation systems can be overlapped for expanded production, the bottom of each heating well 1 is positioned on a bottom plate rock stratum below an underground coal layer, the bottom of each production well 2 is positioned above a coal layer, the two production wells 2 are communicated with each other to form the gas collection lane 3, and the gas collection lanes 3 are communicated with the coal layers; in the two production wells 2, the well mouth of one production well 2 is connected with an air inlet device, and the well mouth of the other production well 2 is connected with a gas collecting device.
The invention and the system have the following advantages:
(1) The novel underground interlayer type coal in-situ gasification mining method is safe and reliable, changes the traditional coal production mode, can realize unmanned underground coal mining in the mining process, enables the coal production to be safer and more reliable, and greatly reduces the incidence rate of mine accidents and occupational diseases. Meanwhile, the disturbance influence on the in-situ coal bed can be reduced to the maximum extent, and the safety and the sealing performance are better.
(2) The productivity is improved. The novel underground interlayer type coal in-situ gasification mining method can be implemented in a new mining area or a new mining area, and can also recover part of coal resources which cannot be recovered by the traditional method in an old mine, so that the resource utilization rate is improved. Meanwhile, the heating temperature of the bottom floor rock stratum can be controlled in the production process, the gradient change of the rock stratum temperature is realized, finally, different pyrolysis gases in the coal bed are extracted in a quality-based grading manner, and the energy extraction rate is improved.
(3) Is green and environment-friendly. The novel underground interlayer type coal in-situ gasification mining method controls environmental pollution at the source, eliminates the pollution of smoke dust and ash slag discharge generated by coal transportation and gas making in the traditional mining method, does not pollute the surface environment and reduces the ground subsidence caused by conventional coal mining.
(4) Driving employment. The novel underground interlayer type coal in-situ gasification mining method is used for developing and injecting activity for local cities, and gasification projects have a large number of requirements of supporting industries such as construction and transportation and third industries such as service industry in construction period and operation period, so that the development of the related supporting industries of underground coal gasification is driven, a large number of labor employment is driven, the related industries such as coal chemical industry and power generation are developed vigorously, and more employment channels are created.
It should be understood by those skilled in the art that the above embodiments are only for illustrating the present invention and are not to be used as a limitation of the present invention, and that suitable changes and modifications of the above embodiments are within the scope of the claimed invention as long as they are within the spirit and scope of the present invention.
Claims (5)
1. An underground interlayer type coal in-situ gasification mining method is characterized in that: the method comprises the following steps:
1) Evaluating the area of underground coal to be mined, determining the digging position of a heating well (1) on the ground according to an evaluation result, and drilling a plurality of heating wells (1) from the ground to the underground, wherein the bottom of each heating well (1) is positioned below a coal bed, and the area formed by surrounding of the plurality of heating wells (1) covers the area of the coal to be mined;
2) Drilling two production wells (2) from the ground to the underground, wherein the bottoms of the production wells (2) are positioned above a coal layer, and the two production wells (2) are positioned in an area surrounded by a plurality of heating wells (1);
3) A gas collection lane (3) is excavated between the bottoms of the two production wells (2) along the direction of the coal layer, and a plurality of gas collection holes communicated with the coal layer are arranged in the gas collection lane (3);
4) The coal bed is heated through the bottom of the heating well (1), heat is transferred to the coal bed through a bottom rock stratum around the heating well (1), and the heating temperature is controlled through a ground heat control system;
5) The coal layer is heated by the interlayer and then undergoes a pyrolysis reaction, and gaseous products generated after the reaction are collected in the gas collection lane (3) through the gas collection holes;
6) Injecting drainage gas into one of the production wells (2) on the ground, enabling the drainage gas to flow through the gas collecting roadway (3), bringing the pyrolyzed gaseous product to a separation system on the ground through the other production well (2), and storing the gaseous product after separation;
the vertical distance from the bottom of the heating well (1) to the coal layer is 100 to 1000 meters;
the number of the heating wells (1) is four, the four heating wells (1) surround to form a quadrangle, and the distance between every two adjacent heating wells (1) is 100-500 m;
each production well (2) is positioned on the connecting line of two adjacent heating wells (1), and the two production wells (2) are symmetrically arranged by the center of a quadrangle formed by surrounding four heating wells (1);
the bottom of the production well (2) is positioned at the elevation position of the top plate of the coal layer;
in the step 4), the heating mode is carried out through the bottom of the heating well (1), the ground heat control system conveys the combustible gas with high heat value to the bottom of the heating well (1), and the bottom rock stratum around the heating well (1) is heated after the combustible gas is ignited.
2. An underground interlayer type coal in-situ gasification mining method according to claim 1, characterized in that: injecting a gasification catalyst into the coal bed through the gas collection holes before heating, wherein the catalyst is a potassium-based catalyst, an iron-based catalyst, a composite catalyst of 5% KOH and 3% CaO; the drainage gas is high-temperature steam and supercritical carbon dioxide.
3. An underground interlayer type coal in-situ gasification mining method according to claim 1, characterized in that: the ground heat control system in the step 4) comprises a monitoring center arranged on the ground, and the monitoring center controls the heating time and the heating temperature through thermocouples and pressure sensors arranged on the bottom plate rock stratum and the coal layer.
4. An underground interlayer type coal in-situ gasification mining method according to claim 3, characterized in that: the thermocouples are respectively arranged on the bottom plate rock stratum and the top plate of the coal layer.
5. A unit circulation system applying the underground interlayer type coal in-situ gasification mining method according to any one of claims 1 to 4, characterized in that: the coal-fired boiler comprises four heating wells (1), two production wells (2) and a gas-collecting lane (3), wherein the bottom of each heating well (1) is located on a bottom plate rock layer below an underground coal layer, the bottom of each production well (2) is located above a coal layer, the two production wells (2) are communicated to form the gas-collecting lane (3), and the gas-collecting lane (3) is communicated with the coal layer; and in the two production wells (2), the wellhead of one production well (2) is connected with a drainage gas inlet device, and the wellhead of the other production well (2) is connected with a gas collecting device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011496001.1A CN112483062B (en) | 2020-12-17 | 2020-12-17 | Underground interlayer type coal in-situ gasification mining method and system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011496001.1A CN112483062B (en) | 2020-12-17 | 2020-12-17 | Underground interlayer type coal in-situ gasification mining method and system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112483062A CN112483062A (en) | 2021-03-12 |
| CN112483062B true CN112483062B (en) | 2022-11-18 |
Family
ID=74916513
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011496001.1A Active CN112483062B (en) | 2020-12-17 | 2020-12-17 | Underground interlayer type coal in-situ gasification mining method and system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112483062B (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113738336B (en) * | 2021-07-30 | 2022-06-07 | 西安交通大学 | Oil-rich coal underground pyrolysis heat energy cyclic utilization system |
| CN113803040A (en) * | 2021-10-27 | 2021-12-17 | 西安科技大学 | Oil-rich coal underground in-situ gasification and pyrolysis integrated co-production method |
| CN115559701B (en) * | 2022-10-27 | 2024-05-10 | 安徽理工大学 | Suitability evaluation method for developing underground coal gasification engineering by utilizing deep coal seam |
| CN116804361B (en) * | 2023-06-26 | 2023-12-12 | 中国矿业大学(北京) | Method, system, electronic equipment and storage medium for monitoring stratified temperature of overburden |
| CN116575900B (en) * | 2023-07-07 | 2023-09-15 | 太原理工大学 | In-situ coal partition controllable gasification hydrogen production and CO 2 Sealing and storing integrated method |
| CN117823112B (en) * | 2024-03-06 | 2024-04-30 | 太原理工大学 | In-situ coal supercritical water gasification hydrogen production different-layer mining method and device |
Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1575376A (en) * | 2001-10-24 | 2005-02-02 | 国际壳牌研究有限公司 | In situ recovery from a hydrocarbon containing formation using barriers |
| CN101382061A (en) * | 2007-09-07 | 2009-03-11 | 新奥科技发展有限公司 | Novel coalbed gas thermal recovery process |
| CN101563524A (en) * | 2006-10-13 | 2009-10-21 | 埃克森美孚上游研究公司 | Combined development of oil shale by in situ heating with a deeper hydrocarbon resource |
| CN102606128A (en) * | 2011-12-29 | 2012-07-25 | 新奥气化采煤有限公司 | Oil shale mining method and device |
| CN102834586A (en) * | 2010-04-09 | 2012-12-19 | 国际壳牌研究有限公司 | Methods for heating with slots in hydrocarbon formations |
| CN103422848A (en) * | 2013-09-06 | 2013-12-04 | 新奥气化采煤有限公司 | Underground coal gasification method and grouting device |
| CN203499663U (en) * | 2013-04-28 | 2014-03-26 | 吉林省众诚汽车服务连锁有限公司 | Device for extracting shale oil and gas by virtue of fracturing and chemical dry distillation of oil shale in-situ horizontal wells |
| CN103696747A (en) * | 2013-11-09 | 2014-04-02 | 吉林大学 | Method for extracting shale oil and gas from oil shale in situ |
| CN104563992A (en) * | 2014-12-22 | 2015-04-29 | 新奥气化采煤有限公司 | Coal underground gasification system and control method |
| CN105971581A (en) * | 2016-06-30 | 2016-09-28 | 华南理工大学 | Device and method for efficiently exploiting natural gas hydrate by adopting flue gas of power plant |
| CN106437667A (en) * | 2016-08-31 | 2017-02-22 | 吉林大学 | Eddy current heating oil shale underground in-situ mining method |
| CN110541695A (en) * | 2019-09-05 | 2019-12-06 | 西安科技大学 | Efficient oil extraction method for in-situ pyrolysis of oil-rich coal by superheated steam |
| CN110924919A (en) * | 2019-12-11 | 2020-03-27 | 中国矿业大学 | Method for increasing production of coal bed gas by waste heat in underground coal gasification process |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20100276139A1 (en) * | 2007-03-29 | 2010-11-04 | Texyn Hydrocarbon, Llc | System and method for generation of synthesis gas from subterranean coal deposits via thermal decomposition of water by an electric torch |
-
2020
- 2020-12-17 CN CN202011496001.1A patent/CN112483062B/en active Active
Patent Citations (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1575376A (en) * | 2001-10-24 | 2005-02-02 | 国际壳牌研究有限公司 | In situ recovery from a hydrocarbon containing formation using barriers |
| CN101563524A (en) * | 2006-10-13 | 2009-10-21 | 埃克森美孚上游研究公司 | Combined development of oil shale by in situ heating with a deeper hydrocarbon resource |
| CN101382061A (en) * | 2007-09-07 | 2009-03-11 | 新奥科技发展有限公司 | Novel coalbed gas thermal recovery process |
| CN102834586A (en) * | 2010-04-09 | 2012-12-19 | 国际壳牌研究有限公司 | Methods for heating with slots in hydrocarbon formations |
| CN102606128A (en) * | 2011-12-29 | 2012-07-25 | 新奥气化采煤有限公司 | Oil shale mining method and device |
| WO2013097669A1 (en) * | 2011-12-29 | 2013-07-04 | 新奥气化采煤有限公司 | Oil shale exploitation method and device |
| CN203499663U (en) * | 2013-04-28 | 2014-03-26 | 吉林省众诚汽车服务连锁有限公司 | Device for extracting shale oil and gas by virtue of fracturing and chemical dry distillation of oil shale in-situ horizontal wells |
| CN103422848A (en) * | 2013-09-06 | 2013-12-04 | 新奥气化采煤有限公司 | Underground coal gasification method and grouting device |
| CN103696747A (en) * | 2013-11-09 | 2014-04-02 | 吉林大学 | Method for extracting shale oil and gas from oil shale in situ |
| CN104563992A (en) * | 2014-12-22 | 2015-04-29 | 新奥气化采煤有限公司 | Coal underground gasification system and control method |
| CN105971581A (en) * | 2016-06-30 | 2016-09-28 | 华南理工大学 | Device and method for efficiently exploiting natural gas hydrate by adopting flue gas of power plant |
| CN106437667A (en) * | 2016-08-31 | 2017-02-22 | 吉林大学 | Eddy current heating oil shale underground in-situ mining method |
| CN110541695A (en) * | 2019-09-05 | 2019-12-06 | 西安科技大学 | Efficient oil extraction method for in-situ pyrolysis of oil-rich coal by superheated steam |
| CN110924919A (en) * | 2019-12-11 | 2020-03-27 | 中国矿业大学 | Method for increasing production of coal bed gas by waste heat in underground coal gasification process |
Also Published As
| Publication number | Publication date |
|---|---|
| CN112483062A (en) | 2021-03-12 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN112483062B (en) | Underground interlayer type coal in-situ gasification mining method and system | |
| CN103670338B (en) | A kind of coal bed gas and coal mining method altogether | |
| CN108487888B (en) | Auxiliary heating device and method for improving oil gas recovery ratio of oil shale in-situ exploitation | |
| CN103232852B (en) | Method and process for extracting shale oil and gas by in-situ shaft fracturing chemical distillation of oil shale | |
| CN101871339B (en) | Method for underground in-situ extraction of hydrocarbon compound in oil shale | |
| CN102383772B (en) | Well drilling type oil gas preparing system through gasification and dry distillation of oil shale at normal position and technical method thereof | |
| CN107939370B (en) | Strip type coal underground gasification system and production method | |
| CN102287177A (en) | Method for gasifying underground coal | |
| CN108756839B (en) | Oil shale heat insulation synergistic in-situ conversion method and system | |
| CN103670357A (en) | Method for crack communication, channel processing and underground gasification of underground mineral contained organic carbon reservoir | |
| CN102606128A (en) | Oil shale mining method and device | |
| CN112483063B (en) | Underground interlayer type coal in-situ gasification mining system and construction method thereof | |
| CN103321618A (en) | Oil shale in-situ mining method | |
| CN203499663U (en) | Device for extracting shale oil and gas by virtue of fracturing and chemical dry distillation of oil shale in-situ horizontal wells | |
| CN114718534A (en) | In-situ pyrolysis system for coupling self-heating and electric heating of oil-rich coal | |
| CN109630081A (en) | A kind of coal bed drilling note high pressure-temperature vapor strengthens coal bed gas drainage device and method | |
| CN103470223B (en) | The method and system that a kind of fossil energy low-carbon (LC) is adopted altogether | |
| CN209569001U (en) | A kind of oil shale in-situ recovery well down-firing heating device | |
| CN114876438A (en) | Coal mining method for in-situ hydrogen production of filling coal | |
| CN108952719B (en) | Method for coal loss in coal seam gasification re-mining under fully mechanized caving mining condition | |
| CN113803048A (en) | Coal in-situ separation mining method based on pyrolysis | |
| CN113914846A (en) | Method for improving development of underground coal gasification air cavity by applying double-feather horizontal well | |
| CN115163019B (en) | High-temperature steam fracturing in-situ pyrolysis oil-rich coal separate mining system and method | |
| CN217357614U (en) | Power coal in-situ L-shaped gas supply combustion and H-shaped efficient heat collection and carbon sequestration system | |
| CN112267862B (en) | Multi-channel exhaust longitudinal fracturing oil shale in-situ mining method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |