CN110219636B - Heat-insulation closed plugging method for injection and exhaust drilling channel of underground coal gasification furnace - Google Patents
Heat-insulation closed plugging method for injection and exhaust drilling channel of underground coal gasification furnace Download PDFInfo
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- CN110219636B CN110219636B CN201910531979.8A CN201910531979A CN110219636B CN 110219636 B CN110219636 B CN 110219636B CN 201910531979 A CN201910531979 A CN 201910531979A CN 110219636 B CN110219636 B CN 110219636B
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- 238000005553 drilling Methods 0.000 title claims abstract description 113
- 238000002347 injection Methods 0.000 title claims abstract description 51
- 239000007924 injection Substances 0.000 title claims abstract description 51
- 238000002309 gasification Methods 0.000 title claims abstract description 50
- 239000003245 coal Substances 0.000 title claims abstract description 25
- 238000000034 method Methods 0.000 title claims abstract description 14
- 238000009413 insulation Methods 0.000 title claims abstract description 13
- 238000000926 separation method Methods 0.000 claims abstract description 90
- 239000000463 material Substances 0.000 claims abstract description 33
- 239000011435 rock Substances 0.000 claims abstract description 23
- 239000004568 cement Substances 0.000 claims abstract description 9
- 238000012544 monitoring process Methods 0.000 claims abstract description 8
- 239000007787 solid Substances 0.000 claims abstract description 6
- 238000007789 sealing Methods 0.000 claims description 13
- 239000007788 liquid Substances 0.000 claims description 9
- 239000003795 chemical substances by application Substances 0.000 claims description 6
- 238000001514 detection method Methods 0.000 claims description 6
- 230000000903 blocking effect Effects 0.000 claims description 3
- 230000008859 change Effects 0.000 claims description 3
- 230000002787 reinforcement Effects 0.000 claims description 3
- 239000000725 suspension Substances 0.000 claims 2
- 238000006243 chemical reaction Methods 0.000 abstract description 7
- 238000011065 in-situ storage Methods 0.000 abstract description 6
- 230000008901 benefit Effects 0.000 abstract description 3
- 239000007789 gas Substances 0.000 description 64
- 230000008569 process Effects 0.000 description 4
- 238000002955 isolation Methods 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 238000005065 mining Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 229910002091 carbon monoxide Inorganic materials 0.000 description 1
- 239000003034 coal gas Substances 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 125000004435 hydrogen atom Chemical class [H]* 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 239000002341 toxic gas Substances 0.000 description 1
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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
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/13—Methods or devices for cementing, for plugging holes, crevices or the like
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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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- 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
- E21B47/00—Survey of boreholes or wells
-
- 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
- E21B47/00—Survey of boreholes or wells
- E21B47/06—Measuring temperature or pressure
- E21B47/07—Temperature
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
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- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geophysics (AREA)
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Abstract
The invention discloses a heat-insulating closed plugging method for an injection and exhaust drilling channel of an underground coal gasification furnace, which comprises the steps of constructing a closed drilling channel phi I section and a phi II section by carrying out sectional reaming on one side, close to a bottom plate rock roadway, of the injection/exhaust drilling channel of an in-situ gasification reaction furnace, installing a phi I section drilling channel separation sleeve and filling a gap between the phi I section drilling channel wall and the outer wall of the separation sleeve I at one time by adopting a high-strength high-temperature-resistant material; installing a phi II section drilling channel sleeve, secondarily filling a gap between the phi II section drilling channel wall and the outer wall of the separation sleeve II by adopting a high-strength high-temperature-resistant material, and arranging a solid plugging block; respectively installing temperature thermocouples at the front end and the tail end of the bottoms of the separation sleeves I and II, and leading lead wires of the temperature thermocouples to a temperature monitoring system in a bedrock roadway; and (3) filling for three times: and installing and filling an end baffle of the phi II section drilling channel separation sleeve II, filling the separation sleeve I and the separation sleeve II of the phi I section drilling channel and the phi II section drilling channel through the filling port, and filling high-temperature-resistant cement until the separation sleeve I and the separation sleeve II are tightly filled. The invention has the advantages of not only carrying out good heat insulation on the injection and exhaust pipeline of the roadway part, but also preventing the leakage of high-temperature gas.
Description
Technical Field
The invention belongs to the technical field of coal mining, and relates to a heat-insulating closed plugging method for an injection and exhaust drilling channel of an underground coal gasification furnace.
Background
The underground coal gasification is a new type of in-situ fluidized coal resource exploiting method, in the course of underground gasification, air, oxygen, saturated steam or their mixed gas are injected into the reaction interface in the gasification furnace from the gas injection pipeline outside the gasification furnace, high-temperature gas (including carbon monoxide, hydrogen, methane, carbon dioxide, etc.) is generated in the high-temperature reaction interface in the underground gasification furnace, then the high-temperature gas is passed through the external exhaust pipeline of gasification furnace, and fed into external pipe network and conveyed to ground. In order to ensure the air tightness of the underground coal gasification furnace and prevent high-temperature toxic gas from leaking into an external roadway to hurt personnel, the part of an injection and exhaust drilling channel connected with the external roadway of the underground coal gasification furnace needs to be sealed and blocked. Under the condition that a mobile gas injection pipeline is adopted in patent CN107387055A, the possibility that high-temperature gas in the gasification furnace leaks to a roadway from a gap between the outer side of the pipeline and the inner wall of the channel exists, the temperature of product gas of the underground coal gasification process is high, the temperature of gas in an exhaust channel can reach 200-300 ℃, particularly, in the later operation stage of the gasification furnace, a high-temperature area in the furnace is close to a mining stop line, and the temperature of the gas in the exhaust channel can reach 400-500 ℃. Therefore, the heat insulation problem of high-temperature coal gas in the exhaust channel in the whole process of underground coal gasification needs to be considered. Therefore, how to realize effective sealing and plugging of the channel outside the pipeline and realize proper heat insulation under the condition of high-temperature gas in the underground coal gasification furnace is a main problem to be solved by the patent. Among the current technical scheme, the tunnel that has the well formula to build the stove mode and construct keeps apart the confined wall, is difficult to carry out effective gas isolation airtight to the high-pressure (gasifier internal pressure can reach 1 ~ 2MPa) condition in the gasifier, because the fissure area that forms around the tunnel comparatively develops, only relies on solid separation wall to be difficult to carry out effective shutoff to high-pressure gas, must produce gas leakage. The existing isolation sealing wall does not consider the influence of the high-temperature action of gas in a gasification furnace on a plugging material. The existing technical scheme does not have a heat insulation airtight plugging scheme aiming at an air injection and exhaust drilling channel section communicated with a bottom plate rock roadway of an in-situ coal bed reaction furnace, and the heat insulation airtight plugging requires that the operation space of bottom plate rock roadway personnel is completely isolated from high-temperature and high-pressure gas in the in-situ coal bed reaction furnace so as to ensure the absolute safety of the operation space personnel of the bottom plate rock roadway.
Disclosure of Invention
The invention aims to provide a heat-insulating closed plugging method for an injection and exhaust drilling channel of an underground coal gasification furnace, which can effectively solve the problem of isolation and closure of high-temperature gas in the underground coal gasification furnace and an external roadway space; the heat insulation device has the beneficial effects that the heat insulation device not only can well insulate a gas exhaust pipeline of the roadway part, but also can prevent high-temperature gas from leaking, so that the safety is improved, and the safety benefit is improved.
The technical scheme adopted by the invention is carried out according to the following steps:
step 1: drilling: constructing a phi I section drilling channel and a phi II section drilling channel which are filled and sealed through reaming on the basis of a gas injection drilling channel or a gas exhaust drilling channel;
and step 5, secondary filling: filling a gap between a channel wall and the outer wall of the separation sleeve II by adopting a high-strength high-temperature-resistant material outside the separation sleeve II of the phi II section drilling channel, plugging cracks on the wall surface of the drilling channel, filling the material densely and completely hardening the material, and installing a solid plugging block at one end close to the wall surface of the rock roadway on the external bottom plate;
Further, before the gasifier runs, the airtightness detection needs to be performed on the sealed section, namely, an exhaust channel pipeline valve of the sealed section outside the gasifier is closed, gas with a certain pressure is injected into the gasifier through an gas injection pipeline or an exhaust pipeline, the leakage condition and the gas pressure change condition of the pressure in the gasifier are monitored, meanwhile, airtightness detection liquid is coated on the wall surface of the sealed section of the exhaust injection drilling channel of the bottom plate rock roadway, if liquid bubbles are detected, a gas leakage point exists in the sealed section, and the sealed section of the exhaust injection drilling channel needs to be sealed again; if no liquid bubble is found, the pressure in the gasification furnace is stable, the pressure-bearing condition is better, and the leakage rate is within a reasonable range, the sealed work is considered to be qualified, in the operation process of the gasification furnace, a CO gas detector is hung above the wall surface of a bottom plate rock roadway close to the sealed section of the injection and exhaust drilling channel, the concentration of CO gas is monitored in real time, an alarm is given, if the concentration of CO continuously exceeds a certain concentration, on the basis of eliminating the increase of the concentration of CO caused by other factors, the increase of the concentration of CO caused by the gas leakage of the sealed section can be judged, the gasification agent injection is suspended and the operation is stopped for the gasification furnace, a certain means is adopted to carry out grouting reinforcement on the sealed section, the air tightness is enhanced, and under the condition of meeting the requirements, the gasification agent injection of the underground gasification furnace is recovered, and the underground gasification furnace is.
Further, the gas injection drilling channel or the gas exhaust drilling channel is divided into a phi I section drilling channel and a phi II section drilling channel, and has different inner diameters, wherein the inner diameter of the phi I section drilling channel is 0.5-1.0 m larger than the diameter of the gas injection pipeline or the gas exhaust pipeline, the length of the phi I section drilling channel is 3-5 m, the inner diameter of the phi II section drilling channel is 0.5-1.0 m larger than the inner diameter of the phi I section drilling channel, the length of the phi II section drilling channel is 3-5 m, the diameter of the separation sleeve I is 0.4-0.8 m larger than the diameter of the gas injection pipeline or the gas exhaust pipeline, and the length of the sleeve is the same as that of the section of the sealed drilling channel; the diameter of the separation sleeve II is 0.4-0.8 m larger than that of the separation sleeve I, the length of the sleeve is the same as that of the section of the sealed drilling channel, a group of separation sleeve I supporting blocks and separation sleeve II supporting blocks are arranged on the outer wall surfaces of the separation sleeve I and the separation sleeve II at intervals and around the circumference, the separation sleeve I supporting blocks and the separation sleeve II supporting blocks are arc-shaped steel supporting legs, the group of separation sleeve I supporting blocks and the separation sleeve II supporting blocks are 4 blocks and 5-15 cm in height, the high-strength high-temperature-resistant material is a filling material filled in the gaps between the outer wall of the separation sleeve and the inner wall surface of the gas injection drilling channel or the gas exhaust drilling channel, the high-strength high-temperature-resistant material is in the range of normal temperature-600 ℃, the high-temperature-resistant cement is a filling material filled in the separation sleeve, the high-temperature-resistant and high-strength high-temperature-resistant, the temperature values outside the gas injection line or the gas exhaust line can be monitored.
Drawings
FIG. 1 is a view of the whole elevation of the heat insulation sealing plug;
FIG. 2 is a view of the divider sleeve;
FIG. 3 is a sectional view taken along line A-A;
FIG. 4 is a sectional view taken along line B-B;
FIG. 5 is a cross-sectional view taken along line C-C.
In the figure: 1-gas injection or exhaust lines; 2-separation sleeve I; 3-a support block of the separation sleeve I; 4-separation sleeve II; 5-a separation sleeve II supporting block; 6-end baffle; 7-a filling port; 8-filling the air release port; 9-high strength high temperature resistant material; 10-high temperature resistant cement; 11-solid plugging blocks; a 12-phi I section of drilling channel; a 13-phi II section drilling channel; 14-a rock formation; 15-temperature thermocouple; 16-a temperature monitoring system; 17-gas injection drilled or exhaust drilled channels; 18-CO gas detector.
Detailed Description
The present invention will be described in detail with reference to the following embodiments.
As shown in figures 1 to 5, a gas injection drilling channel or an exhaust drilling channel 17 is arranged at one end close to a bottom plate rock roadway, and comprises a sealed drilling channel phi I section 12 and a sealed drilling channel phi II section 13 with different diameters, a separation sleeve I2 and a separation sleeve II 4 with different diameters, a high-strength high-temperature-resistant material 9, high-temperature-resistant cement 10 and a temperature monitoring system 16. The gas injection drilling channel or the gas exhaust drilling channel 17 is a channel which is constructed from a coal underground gasification furnace bottom plate rock roadway and used for expanding holes of the gas injection drilling channel and the gas exhaust drilling channel of the coal underground gasification furnace, the channel is divided into a phi I section and a phi II section, and has different inner diameters, wherein the inner diameter of the phi I section drilling channel 12 is 0.5 m-1.0 m greater than the diameter of the gas injection pipeline or the gas exhaust pipeline 1, the length of the phi I section drilling channel is generally 3 m-5 m, the inner diameter of the phi II section drilling channel 13 is 0.5 m-1.0 m greater than the inner diameter of the phi I section drilling channel 12, and the length of the phi II section drilling channel is 3 m-5 m. The diameter of the separation sleeve I2 is 0.4-0.8 m larger than that of the gas injection pipeline or the exhaust pipeline 1, and the length of the sleeve is the same as that of the section of the sealed drilling channel; the diameter of the separation sleeve II 4 is 0.4-0.8 m larger than that of the separation sleeve I2, and the length of the sleeve is the same as that of the section of the sealed drilling passage. A group of support blocks 3 of the separation sleeve I and support blocks 5 of the separation sleeve II are circumferentially arranged on the outer wall surfaces of the separation sleeve I2 and the separation sleeve II 4 at intervals, are arc-shaped steel support legs, are 4, play a role in supporting a gap between the separation sleeve 2 and the gas injection drilling channel or the exhaust drilling channel 17, are 5 cm-15 cm in height, and provide space for filling materials.
The high-strength high-temperature-resistant material 9 is a filling material filled in the pores between the outer wall of the separation sleeve 2 and the inner wall of the gas injection drilling channel or the exhaust drilling channel 17, has the characteristics of high temperature resistance and high strength, can resist the temperature ranging from normal temperature to 600 ℃, and has effective air tightness for high-temperature and high-pressure gas. The high-temperature-resistant cement 10 is a filling material for filling and separating the interior of the casing 2, has the characteristics of high temperature resistance and high strength, and can effectively isolate the heat of high-temperature gas in the pipeline of the injection and exhaust channel. The temperature monitoring system 16 comprises temperature thermocouples 15 distributed in the filling material inside the separation sleeve 2 and temperature monitoring equipment in the bottom rock roadway, and can monitor the temperature value outside the gas injection pipeline or the gas exhaust pipeline 1.
Step 1: drilling: on the basis of a gas injection drilling channel or an exhaust drilling channel 17, a phi I section drilling channel 12 and a phi II section drilling channel 13 which are filled and sealed are constructed through hole expansion;
and step 5, secondary filling: outside a separation sleeve II 4 of a phi II section drilling channel 13, filling a gap between a channel wall and the outer wall of the separation sleeve II 4 with a high-strength high-temperature-resistant material 9, plugging a crack on the wall surface of the drilling channel, filling the crack to be compact and completely hardening the material, and installing a solid plugging block 11 at one end close to the wall surface of the rock roadway of an external bottom plate;
and 8: the operation is carried out to complete the heat insulation sealing plugging work of the air injection and exhaust drilling channel, before the gasification furnace runs, the air tightness detection is carried out on the sealing section, namely, an exhaust channel pipeline valve of the sealing section outside the gasification furnace is closed, gas with certain pressure is injected into the gasification furnace through an air injection pipeline or an exhaust pipeline 1, the leakage condition and the gas pressure change condition of the pressure in the gasification furnace are monitored, meanwhile, air tightness detection liquid is coated on the wall surface of the sealing section of the air injection and exhaust drilling channel of the bottom plate rock roadway, if liquid bubbles are detected, the existence of gas leakage points in the sealing section is indicated, and the sealing section of the air injection and exhaust drilling channel needs to be sealed again; if no liquid bubble is found, the pressure in the gasification furnace is stable, the pressure-bearing condition is better, and the leakage rate is within a reasonable range, the sealed work is considered to be qualified, in the operation process of the gasification furnace, a CO gas detector 18 is hung above the wall surface of a bottom plate rock roadway close to the sealed section of the injection and exhaust drilling channel, the concentration of CO gas is monitored in real time, an alarm is given, if the concentration of CO continuously exceeds a certain concentration, on the basis of eliminating the increase of the concentration of CO caused by other factors, the increase of the concentration of CO caused by the gas leakage of the sealed section can be judged, the gasification agent injection of the gasification furnace needs to be suspended, the operation is stopped, a certain means is adopted to carry out grouting reinforcement on the sealed section, the air tightness is enhanced, and under the condition of meeting the requirements, the gasification agent injection of the underground gasification furnace is recovered, and the underground gasification.
The invention adopts a method for reaming holes of the injection and exhaust channels of the underground coal gasification furnace, and constructs two sections of sealed filling drilling channels with different inner diameters as channels for heat insulation sealed filling operation of an in-situ coal bed reaction furnace and an external floor rock roadway. The constructed two sections of sealed filling drilling channels with different inner diameters are respectively nested with a separation sleeve inside, and a filling space is divided into two parts, namely, a gap between the separation sleeve and the inner wall of the channel is filled by adopting a high-temperature-resistant high-strength filling material, and cracks on the wall surface of the drilling channel can be plugged, so that high-temperature and high-pressure gas leakage in a gasification furnace can be effectively isolated; and secondly, the internal space of the sleeve is partitioned, and high-temperature-resistant cement is adopted for filling, so that the heat of high-temperature gas in the exhaust drill hole can be isolated.
The invention also has the advantages that:
(1) the heat-insulating sealing channel is located coal seam floor rock, and construction operation is carried out from coal seam floor rock roadway, and is convenient to operate, good in safety and good in sealing effect.
(2) According to the scheme, the high-temperature high-pressure gas in the in-situ coal bed reaction furnace can be completely isolated and sealed from the operation space of external personnel only by constructing the drilling channel with a small cross section, so that the investment is low, the construction is fast, and the method is simple and easy to implement.
(3) The scheme adopts different filling materials to fill different filling spaces in a segmented and partitioned manner, and has feasible operation and good sealing effect.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not intended to limit the present invention in any way, and all simple modifications, equivalent variations and modifications made to the above embodiments according to the technical spirit of the present invention are within the scope of the present invention.
Claims (1)
1. A thermal insulation closed plugging method for an injection and exhaust drilling channel of an underground coal gasification furnace is characterized by comprising the following steps:
step 1: drilling: constructing a phi I section drilling channel and a phi II section drilling channel which are filled and sealed through reaming on the basis of a gas injection drilling channel or a gas exhaust drilling channel;
step 2, installing a phi I section of drilling channel sleeve: installing a separation sleeve I in a phi I section drilling channel;
step 3, primary filling: filling gaps on the outer wall of the separation sleeve I outside the separation sleeve I of the drill hole channel at the phi I section by adopting a high-strength high-temperature-resistant material, plugging cracks on the wall surface of the drill hole channel, and filling the material densely until the material is completely hardened;
step 4, installing a phi II section drilling channel sleeve: a separation sleeve II is arranged in a sealed phi II section drilling channel, the front end of the separation sleeve II is inserted into the separation sleeve I, so that tight combination can be realized, and excessive inflow into the separation sleeve I and the separation sleeve II when high-strength high-temperature-resistant materials are filled is prevented through the blocking effect of a pipeline;
and step 5, secondary filling: filling gaps on the outer wall of the separation sleeve II outside the separation sleeve II of the phi II section drilling channel with a high-strength high-temperature-resistant material, plugging cracks on the wall surface of the drilling channel, filling the materials densely and completely hardening, and installing a solid plugging block at one end close to the wall surface of the rock roadway on the external bottom plate;
step 6, installing a temperature thermocouple: respectively installing 2 temperature thermocouples at the front end and the tail end of the bottom of a separation sleeve I in a phi I section drilling channel, respectively installing 2 temperature thermocouples at the front end and the tail end of the bottom of a separation sleeve II in a phi II section drilling channel, installing 4 temperature thermocouples in total, and leading lead wires of the temperature thermocouples to a temperature monitoring system in a floor rock roadway;
step 7, filling for three times: installing and filling an end baffle of a phi II section drilling channel separation sleeve II, and filling high-temperature-resistant cement into the separation sleeve I and the separation sleeve II through filling ports until the separation sleeve I and the separation sleeve II are tightly filled;
before the gasifier runs, the airtight section needs to be subjected to airtight detection, namely, an exhaust channel pipeline valve of the airtight section outside the gasifier is closed, gas with certain pressure is injected into the gasifier through an air injection pipeline or an exhaust pipeline, the leakage condition and the gas pressure change condition of the pressure in the gasifier are monitored, meanwhile, airtight detection liquid is coated on the wall surface of the airtight section of the air injection drilling channel or the exhaust drilling channel of the bottom plate rock roadway, if liquid bubbles are detected, the airtight section is indicated to have gas leakage points, and the airtight section of the air injection drilling channel or the exhaust drilling channel needs to be subjected to airtight work again; if no liquid bubble is found, the pressure in the gasification furnace is stable, the pressure-bearing condition is better, and the leakage rate is in a reasonable range, the sealing work is qualified, during the operation of the gasification furnace, a CO gas detector is hung above the wall surface of a bottom plate rock roadway close to the closed section of the gas injection drilling channel or the gas exhaust drilling channel to monitor the concentration of CO gas in real time and give an alarm, if the concentration of CO continuously exceeds a certain concentration, on the basis of eliminating the CO concentration rise caused by other factors, the method can be concluded that the CO concentration rise caused by the gas leakage of the closed section needs to perform gasification agent injection suspension and operation suspension treatment on the gasification furnace, and adopts a certain means to perform grouting reinforcement on the closed section to enhance the air tightness, and under the condition of meeting the requirements, the injection of the gasifying agent into the underground gasification furnace is recovered, and the operation of the underground coal gasification furnace is recovered.
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| CN112096337B (en) * | 2020-09-25 | 2022-11-15 | 山东科技大学 | Gas injection pipeline moving sealing system and method for underground coal gasification |
| CN112177559B (en) * | 2020-10-13 | 2021-08-03 | 中国矿业大学 | Novel underground coal gasification drilling process leakage plugging device |
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