CN107218023B - System and method for stabilizing underground coal gasification combustion space area - Google Patents
System and method for stabilizing underground coal gasification combustion space area Download PDFInfo
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- CN107218023B CN107218023B CN201710613576.9A CN201710613576A CN107218023B CN 107218023 B CN107218023 B CN 107218023B CN 201710613576 A CN201710613576 A CN 201710613576A CN 107218023 B CN107218023 B CN 107218023B
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- 239000003245 coal Substances 0.000 title claims abstract description 94
- 238000002309 gasification Methods 0.000 title claims abstract description 91
- 238000002485 combustion reaction Methods 0.000 title claims abstract description 63
- 238000000034 method Methods 0.000 title claims abstract description 26
- 230000000087 stabilizing effect Effects 0.000 title claims abstract description 16
- 238000006243 chemical reaction Methods 0.000 claims description 16
- 239000000945 filler Substances 0.000 claims description 15
- 238000001514 detection method Methods 0.000 claims description 12
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims description 8
- 239000000463 material Substances 0.000 claims description 8
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 8
- 238000012360 testing method Methods 0.000 claims description 8
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 4
- 229910002092 carbon dioxide Inorganic materials 0.000 claims description 4
- 239000001569 carbon dioxide Substances 0.000 claims description 4
- 229910002091 carbon monoxide Inorganic materials 0.000 claims description 4
- 239000003795 chemical substances by application Substances 0.000 abstract description 14
- 238000004519 manufacturing process Methods 0.000 abstract description 5
- 238000011084 recovery Methods 0.000 abstract description 4
- 230000009286 beneficial effect Effects 0.000 abstract 1
- 238000012806 monitoring device Methods 0.000 description 8
- 238000005065 mining Methods 0.000 description 5
- 239000003034 coal gas Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 230000001186 cumulative effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/295—Gasification of minerals, e.g. for producing mixtures of combustible gases
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
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- Mining & Mineral Resources (AREA)
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- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Solid-Fuel Combustion (AREA)
- Feeding And Controlling Fuel (AREA)
Abstract
the invention provides a system for stabilizing underground coal gasification combustion space area, comprising: a pressure swing filling device and a gas production gasification furnace; wherein the recovery gasifier contains: n air inlet holes, gasification channels and air outlet holes; the variable pressure filling device comprises a normal pressure hopper, a variable pressure hopper, an emptying valve and a first valve; the constant pressure hopper is communicated with the pressure swing hopper through a pipeline, the pressure inside the pressure swing hopper can be adjusted through an emptying valve arranged on the pressure swing hopper, and the pressure swing hopper is connected with an air inlet through a pipeline; the air inlet is also communicated with an input pipeline for inputting a gasification agent; and an air outlet pipeline is arranged at the outlet of the air outlet hole. The invention also discloses a method for stabilizing the underground coal gasification combustion space area by using the system. The system and the method of the invention can make the volume of the combustion space area relatively stable, which is beneficial to the effective utilization of equipment and the long-period stable operation of the underground gasification process.
Description
Technical Field
The invention belongs to the technical field of natural resource development and underground coal gasification, and particularly relates to a system and a method for stabilizing a combustion control area of underground coal gasification.
Background
the underground coal gasification technology is a process of directly and controllably burning coal buried underground and generating combustible gas through the thermal action and chemical action of the coal. The underground coal gasification changes the traditional physical coal mining into chemical coal mining, replaces the traditional processes of well building, coal mining and ground gasification, and has the advantages of good safety, less investment, high benefit, less pollution and the like.
In order to exploit underground coal on a large scale, a gasifier needs to be well designed. The most common at present is strip mining, which is basically designed as: a plurality of air inlet holes are formed; a gasification channel and an air outlet. The gasifying agent enters the gasification channel through the air inlet hole gradually and reacts with the coal on the surface of the gasification channel. Along with the continuous progress of the reaction, the formed burning space area is larger and larger. Larger and larger burnout zones store more and more gas underground. In order to maintain the normal gas outlet of the underground gasification furnace, the gas generated by the reaction can come out of the ground through the gas outlet hole, and the flow of the gasification agent entering the gasification furnace must be increased. However, the capacity of the equipment for conveying the gasifying agent configured in the production cannot be infinitely increased, so that the gasifier cannot normally operate.
Disclosure of Invention
the invention aims to provide a system and a method for stabilizing an underground coal gasification combustion space area.
In order to achieve the purpose, the invention adopts the following technical scheme:
a system for stabilizing a coal underground gasification goaf, comprising: a pressure swing filling device and a gas production gasification furnace;
wherein the recovery gasifier contains: n air inlets, wherein N is any natural number more than or equal to 1; the gasification channel is positioned in a coal seam between a top plate and a bottom plate of the gasification furnace; an air outlet; the air inlet hole and the air outlet hole are communicated with the gasification channel;
The variable pressure filling device comprises a normal pressure hopper, a variable pressure hopper, an emptying valve and a first valve; the normal pressure hopper is used for storing filling materials, and the filling materials are used for filling the combustion space area; the constant pressure hopper is communicated with the pressure swing hopper through a pipeline, the pressure inside the pressure swing hopper can be adjusted through an emptying valve arranged on the pressure swing hopper, the pressure swing hopper is connected with an air inlet through a pipeline, and a first valve is arranged on the connected pipeline;
The air inlet is also communicated with an input pipeline for inputting a gasification agent, and a second valve is arranged on the input pipeline; and an air outlet pipeline is arranged at the outlet of the air outlet hole.
As a preferred embodiment, the number of the air inlet holes is multiple, and the air inlet holes are sequentially arranged from far to near from the air outlet hole in the direction along the gasification channel.
In a preferred embodiment, a gasification agent flow detection device is arranged on the gasification agent input pipeline and is used for detecting the input amount of the gasification agent.
as a preferred embodiment, a gas detection device is disposed on the gas outlet pipeline, and the gas detection device is: one or more of a component analyzer, a pressure detection device, a flow monitoring device, a temperature monitoring device.
a method for stabilizing underground coal gasification combustion space area comprises the following steps: A) determining the volume of a combustion space area of the underground coal gasification furnace; B) and filling a combustion space area of the underground coal gasification furnace.
as a preferred embodiment, wherein step B) comprises:
B1) determining a filling wellhead of a combustion space area of the underground coal gasification furnace;
B2) installing a variable-pressure filling device;
B3) Determining the filling amount of a combustion space area of the underground coal gasification furnace;
B4) determining a burnout zone fill rate.
As a preferred embodiment, wherein B3) comprises:
B31) Performing a high-temperature curing test on the filler in the burned-out area;
B32) and determining the volume ratio of the filling material of the burned-out area to the volume of the heated and solidified material.
As a preferred embodiment, wherein B4) comprises:
B41) Determining a filling time;
B42) and solving the filling rate of the combustion space area according to the determined filling amount of the combustion space area.
as a preferred embodiment, wherein a) comprises:
A1) Determining the gas quantity generated by the gas outlet of the underground coal gasification furnace;
A2) Detecting gas components of an air outlet of the underground coal gasification furnace;
A3) Determining the amount of burnt coal in the underground coal gasification reaction zone;
A4) determining the volume of burnt coal in an underground coal gasification reaction zone;
A5) and determining the ash density of the coal after combustion in the underground coal gasification reaction zone.
As a preferred embodiment, wherein a1) comprises: the flow rate detection may be a flow rate difference between any two points in time.
As a preferred embodiment, wherein a2) comprises: detecting the volume percentage of carbon dioxide in the outlet gas, detecting the volume percentage of carbon monoxide and detecting the volume percentage of methane.
as a preferred embodiment, wherein a5) comprises:
A51) coal is combusted in a coal underground gasification reaction zone;
A52) Calibrating the volume of the coal in the underground coal gasification reaction zone after combustion in the coal test;
A53) and obtaining the coal test burning ash density of the underground coal gasification reaction zone.
The invention discloses a system and a method for stabilizing underground coal gasification combustion space area, which judge the filling time of the combustion space area through proper conditions, determine the volume of fillers according to the size of the combustion space area, and fill the fillers into the combustion space area in a controlled manner by controlling an outlet valve of a variable pressure filling device, so that the volume of the combustion space area is always kept within a set range, and the normal use of underground coal gasification equipment is facilitated.
drawings
FIG. 1 is a schematic structural diagram of a system for stabilizing an underground coal gasification combustion space area.
Detailed Description
The technical scheme of the invention is further explained by the specific implementation mode in combination with the attached drawings. It should be noted that the embodiments and drawings listed in the present specification are only exemplary embodiments provided for convenience of description, and the drawings are only schematic structural diagrams, which should not be construed as the only correct embodiments of the present invention, nor should they be construed as limitations of the present invention.
in the process of the strip mining gasification furnace, the combustion space area is larger, so that more and more gas is stored underground, namely, more and more gas generated by reaction is left underground and cannot be conveyed to the ground through the gas outlet hole in time, the capability of the original equipment for conveying the gasification agent cannot be kept up to the ground, and the production efficiency of the coal underground gasification furnace is reduced. Therefore, the invention provides a method for stabilizing the underground coal gasification combustion space area, which realizes effective filling of the underground coal gasification combustion space area by determining the volume of the combustion space area and filling fillers into the combustion space area by means of a variable pressure filling device, so that the volume of the combustion space area is kept within a set range, and the stable operation of the underground coal gasification process is facilitated.
In the present invention, the term "combustion space area" is understood to mean a cavity left after combustion in the underground coal gasification process.
Fig. 1 is a schematic structural diagram of the system for stabilizing the underground coal gasification combustion space area, which comprises: a pressure swing filling device 63 and a gas recovery gasification furnace;
Wherein the recovery gasifier contains: a plurality of air inlet holes 31, 32, 33 … 3N, wherein N is any natural number more than or equal to 1; the number of the gasification channels 4 can be one or more, and the gasification channels 4 are positioned in a coal seam between a top plate 51 and a bottom plate 52 of the gas production furnace; the number of the air outlet holes 2 can be one or more; the air inlet hole and the air outlet hole are communicated with the gasification channel 4;
the variable pressure filling device 63 comprises a normal pressure hopper 632, a variable pressure hopper 631, an emptying valve 6A and a first valve 8 a; the normal pressure hopper 632 is used for storing filling materials, and the filling materials are used for filling combustion air; the normal pressure hopper 632 is communicated with the pressure swing hopper 631 through a pipeline, the pressure inside the pressure swing hopper 631 can be adjusted through an air release valve 6A, the air release valve 6A is an adjusting valve, the pressure swing hopper 631 is connected with the air inlet holes 31, 32 and 33 … 3N through pipelines, the connected pipelines are provided with first valves 8a, 8b and 8c …, and the first valves 8a, 8b and 8c … are adjusting valves;
the air inlet 31, 32, 33 … 3N is also provided with an input pipeline for inputting gasification agent, and the input pipeline is provided with a second valve 8A, 8B …; a flow monitoring device 8C can be arranged on the input pipeline;
An outlet pipeline is arranged at the outlet of the outlet hole 2, and a component analyzer 21, a pressure detection device 22, a flow monitoring device 23 and a temperature monitoring device 24 are arranged on the outlet pipeline, wherein it is to be specifically noted that the monitoring devices are not necessary and uniquely determined, and different numbers and different types of detection devices can be arranged according to the detection requirements of the output gas.
the working mode of the system for stabilizing the underground coal gasification combustion space area and the method for stabilizing the underground coal gasification combustion space area by adopting the system are described in detail as follows:
A) determining the volume of a combustion space area of the underground coal gasification furnace; the detailed determination process is as follows:
A coal sample of mass M01 was sampled in the underground coal gasification area, and the volume thereof was measured to be V01, and the coal density R1 was found to be M01/V01. The coal is sent into a laboratory for testing, and the working composition of the coal can be obtained, wherein the ash content is set as u, and the C content is set as h. All samples were then placed in an above-ground test furnace for combustion, ash was obtained after combustion, and when the ash was cooled, the mass was weighed as M02 and the detection volume was V02, and the ash density after combustion of coal in the underground gasification region, R2, was M02/V02, as is well known.
when the coal is gasified underground, the gasification direction is pushed from the air inlet hole 31, the air inlet hole 32, the air inlet hole 3n of … to the air outlet hole 2, the gasification agent enters the air inlet hole 31 from the pipeline provided with the second valve 8A and the flow detection device 8C, after reaching the gasification channel 4, the coal on the surface of the gasification channel 4 is gasified and reacted, and the produced gas is sent to the ground through the air outlet hole 2 for subsequent treatment and utilization. The gas outlet 2 is provided with a component analyzer 21, a pressure detection device 22, a flow monitoring device 23 and a temperature monitoring device 24, wherein the component analyzer 21 can detect the volume content percentage G1 of carbon dioxide, the volume content percentage G2 of carbon monoxide and the volume content percentage G3 of methane in outlet gas.
When the volume of the combustion space area is less than a first predetermined value, the relationship (q2-q1)/q1 between the inlet flow rate q1 of the gasifying agent and the outlet flow rate q2 is between 0 and a second predetermined value, which is greater than 0. Therefore, the burned-out area is filled, and the judgment of the first preset value is more critical.
as the gasification reaction proceeds, the gasification direction is pushed from the air inlet hole 31, the air inlet holes 32, … and the air inlet hole 3n to the air outlet hole 2, and it is assumed that the gasification agent enters the underground coal gasification furnace from the air inlet hole 32. When Q2 is less than Q1 and is maintained for the first preset time, the combustion space area is the time needing to start filling, the air outlet accumulated flow rate Q2 from the process starting operation time t1 to the time t2 is recorded, and the air inlet accumulated flow rate is Q1.
The volume to be filled is the volume V of the combustion space, i.e. the volume of the burning coal minus the volume of the ash after the coal is burned. It may be determined in this way: according to the law of conservation of mass, the mass of the element C before and after the combustion of coal is constant. According to the basic principle of the Claberlon equation, the mass of the burning coal from t1 to t2 is M1 ═ Q2 ═ 12 ═ (G1+ G2+ G3)/(22.4 ×) can be obtained
from the relationship between volume, density and mass, the volume of the coal fired from t1 to t2 was V1-M1/R1-Q2-12 (G1+ G2+ G3)/(22.4 h R1)
wherein: q2: cumulative flow of outlet gas from t1 to time t2
12: atomic weight of C
g1: volume percentage of carbon dioxide in coal gas
g2: volume percentage of carbon monoxide in coal gas
G3: volume percentage of methane in coal gas
h: percentage of C in underground gasified coal of coal
r1: density of underground coal gasification
In the coal separation, the ratio of ash is u, so the mass of ash obtained after burning coal underground gasified coal from t1 to t2 is M2 ═ M1 ═ Q2 ═ 12 × (G1+ G2+ G3)/(22.4 ×) and the density of ash is R2. The ash obtained after combustion from t1 to t2 was found to have a volume V2 ═ M2/R2 ═ Q2 ═ 12 × (G1+ G2+ G3)/(22.4 × R2) based on the relationship between volume, mass and density
the volume V of the burnout zone V-V1-V2-Q2 × 12 (G1+ G2+ G3)/(22.4 × h R1) -Q2 × 12 × u (G1+ G2+ G3)/(22.4 × h R2) can be obtained.
B) Filling a combustion space area of the underground coal gasification furnace; the detailed process is as follows:
The gob filler having a volume of V03 was taken, and the measured volume after high-temperature solidification was V04, whereby the shrinkage ratio K before and after filling of the gob filler was V04/V03.
since the shrinkage ratio of the gob filler is K, the required volume of the high-temperature-curing filler V1 is
V1＝V*k＝K*(Q2*12*(G1+G2+G3)/(22.4*h*R1)-Q2*12*u*(G1+G2+G3)/(22.4*h*R2))
the filling rate V2 can be obtained as:
V2＝V*k/(t2-t1)＝(K*(Q2*12*(G1+G2+G3)/(22.4*h*R1)-Q2*12*u*(G1+G2+G3)/(22.4*h*R2)))/(t2-t1)。
after the above-mentioned filling volume V1 and filling rate V2 have been determined, the pressure-filling device 63 is loaded into the original inlet opening, here the inlet opening 31. At this point the fill is loaded 632 into an atmospheric hopper.
The second valve 8A of the air inlet 31 is closed, so that the gasifying agent does not enter any more. When the pressure of the air release valve 6A of the pressure swing hopper 631 is 0, the filler in the atmospheric pressure hopper 632 falls into the pressure swing hopper 631 by gravity. Then the blow-down valve 6A of the pressure swing hopper 631 is closed and the first valve 8a below the pressure swing hopper 631 is opened, so that the pressure of the pressure swing hopper 631 is equal to the pressure of the gasification furnace, and the filler of the pressure swing hopper 631 falls into the combustion space area by gravity.
The filling rate is adjusted by the second valve 8a to fill the volume of the high temperature solidified filler V1 in the time interval t1 to t2 to ensure that the volume of the burnout zone remains substantially constant as the process proceeds normally.
It is noted that the fill port is selected as the gasification process proceeds, from the first inlet port, the second inlet port … …, and so on.
The invention discloses a system and a method for stabilizing underground coal gasification combustion space area, which judge the filling time of the combustion space area through proper conditions, determine the volume of fillers according to the size of the combustion space area, and fill the fillers into the combustion space area in a controlled manner by controlling an outlet valve of a variable pressure filling device, so that the volume of the combustion space area is always kept within a set range, and the normal use of underground coal gasification equipment is facilitated.
while the present invention has been described with reference to several exemplary embodiments, it is understood that the terminology used is intended to be in the nature of words of description and illustration, rather than of limitation. As the present invention may be embodied in several forms without departing from the spirit or essential characteristics thereof, it should also be understood that the above-described embodiments are not limited by any of the details of the foregoing description, but rather should be construed broadly within its spirit and scope as defined in the appended claims, and therefore all changes and modifications that fall within the meets and bounds of the claims, or equivalences of such meets and bounds are therefore intended to be embraced by the appended claims.
Claims (3)
1. A method for stabilizing underground coal gasification combustion space area comprises the following steps: A) determining the volume of a combustion space area of the underground coal gasification furnace; B) filling a combustion space area of the underground coal gasification furnace;
Wherein the step A) comprises:
A1) determining the gas quantity generated by the gas outlet of the underground coal gasification furnace;
A2) Detecting gas components of an air outlet of the underground coal gasification furnace;
A3) determining the amount of burnt coal in the underground coal gasification reaction zone;
A4) Determining the volume of burnt coal in an underground coal gasification reaction zone;
A5) determining the ash density of the coal after combustion in the underground gasification reaction zone;
Wherein the step B) comprises:
B1) determining a filling wellhead of a combustion space area of the underground coal gasification furnace;
B2) installing a variable-pressure filling device;
B3) determining the filling amount of a combustion space area of the underground coal gasification furnace;
B4) Determining the filling rate of the combustion space area;
Wherein B3) comprises:
B31) performing a high-temperature curing test on the filler in the burned-out area;
B32) Determining the volume ratio of the filling material of the burned-out area to the volume of the heated and solidified material;
Wherein B4) comprises:
B41) determining a filling time;
B42) solving the filling rate of the combustion space area according to the determined filling amount of the combustion space area;
Wherein the step B4) is to determine the filling rate of the combustion space area according to the volume of the combustion coal, the volume of the ash and the volume of the high-temperature solidified filler.
2. The method of claim 1, wherein a1) comprises: detecting the flow difference between any two moments in flow detection;
A2) The method comprises the following steps: detecting the volume percentage of carbon dioxide in the outlet gas, detecting the volume percentage of carbon monoxide and detecting the volume percentage of methane.
3. the method of claim 2, wherein a5) comprises:
A51) Coal is combusted in a coal underground gasification reaction zone;
A52) calibrating the volume of the coal in the underground coal gasification reaction zone after combustion in the coal test;
A53) And obtaining the coal test burning ash density of the underground coal gasification reaction zone.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| SU710245A1 (en) * | 1975-04-02 | 1988-08-23 | Всесоюзный Научно-Исследовательский Институт Использования Газа В Народном Хозяйстве,Подземного Хранения Нефти,Нефтепродуктов И Сжиженных Газов | Method of underground gasification of coal |
| US4306621A (en) * | 1980-05-23 | 1981-12-22 | Boyd R Michael | Method for in situ coal gasification operations |
| CN100420824C (en) * | 2005-04-21 | 2008-09-24 | 新奥气化采煤有限公司 | Underground coal gasification |
| CN104563992B (en) * | 2014-12-22 | 2018-05-15 | 新奥科技发展有限公司 | Underground coal gasification system and control method |
| CN104692124B (en) * | 2015-02-10 | 2017-05-10 | 东南大学 | Multi-stage sealing transformation feeding system |
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