CN102587883B - Method for quenching underground coal gasifier - Google Patents
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- CN102587883B CN102587883B CN201110386283.4A CN201110386283A CN102587883B CN 102587883 B CN102587883 B CN 102587883B CN 201110386283 A CN201110386283 A CN 201110386283A CN 102587883 B CN102587883 B CN 102587883B
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Abstract
Disclosed is a method for quenching an underground coal gasifier. The underground coal gasifier comprises a burned-out area and at least one pipe extending from the burned-out area to the ground. The method includes: connecting an exhaust fan to an outlet of each pipe; and operating the exhaust fans to pump out gas in the burned-out area to vacuum the burned-out area, and accordingly guiding water in a surrounding of the burned-out area into the burned-out area to quench the gasifier, wherein when at least one pipe is used for vacuuming, other pipes are sealed. The method is simple in operation, easy in control and easy in implementation, and the cost is low as no extra equipment is needed.
Description
Technical field
The present invention relates to Underground Coal Gasification Process control field, particularly relate to a kind of method for quenching underground coal gasifier.
Background technology
Underground coal gasification(UCG) is exactly make underground coal be the technology of fuel gas by thermal chemical reaction in situ conversion, and it integrates shaft building, coal mining, the large technique of conversion three, the new technology of multidisciplinary develop energy and industrial chemicals.Physics coal-mining method is converted into chemistry and mines by it, abandon whole huge, heavy coal excavation apparatus and ground equipment for gasification, and be controlledly burn in underground by traditional ground burning conversion, because of but a kind of Filter Tuber For Clean Coal comprehensive utilization technique, have that safety is good, small investment, efficiency are high, pollute little, benefit advantages of higher.
Underground coal gasification(UCG) first certainly the drilling that faces down to coal seam, in inside, coal seam, boring is linked up again, with one of them boring, gasifying agent (as air, water vapour, oxygen-enriched air etc.) is input to coal seam, coal seam is imperfect combustion under the effect of gasifying agent, and recurring gasification, the fuel gas of generation is transported to ground from another boring.Above-mentioned underground gasification system is also referred to as underground gasification furnace.
Along with the carrying out of underground gasification process, Coal-fired capacity progressively adds up, and the burned out area (referring to the cavity stayed in coal seam due to coal combustion and gasification in Underground Coal Gasification Process) stayed is increasing, and underground gasification heater outlet temperature raises gradually.And along with the accumulation of coal surface grieshoch, the intensity of gasification in coal seam also progressively declines, Seam Roof And Floor Stability is also along with the increase of burned out area is deteriorated gradually, underground gasification furnace burned out area surrounding environment aquifer water also can progressively permeate the ground burned out area, in output gas component, effective coal gas output can reduce gradually, and moisture content in gas also can be more and more higher.This situation just shows, this underground gasification furnace enters the later stage of gasification, and its life cycle closes to an end.When terminating underground gasification, needing underground gasification furnace to extinguish, to prevent coal seam sustained combustion waste resource, and increasing the stability of underground burned out area, and preventing burned out area and aquifer conducting.Under certain condition, also need to carry out filling to burned out area, to prevent subsiding on a large scale of burned out area.
The stove method of going out in the past taked has water filling, injects the methods such as the inert gas such as steam, nitrogen injection.But it is longer that most method puts out the stove time, and a large amount of gas circulations is needed to inject with cooling, with high costs.
Such as, prior art one, patent 201010103397 " the plural gel fireproofing extinguishing materials for coal bed fire hazard treating ", describes a kind of plural gel fireproofing extinguishing materials preventing and treating coal mine fire, is made up of water glass base-material, setting accelerator, composite aggregate and thickening material.The thickener added can increase the denseness of colloid, and improves the suspension of mixture slurry.This plural gel preparation technology is simple, is easy to field conduct application; The gel formed has some strength, can play leak stopping effect; Raw material sources enriches, cheap; Product is nontoxic tasteless, does not pollute Underground well, to human non-toxic's side effect.But it is only applicable to leak stopping and the fire extinguishing of mine, if for the large cavity after underground gasification burning, its operability is not strong, and basic being difficult to realizes.
Prior art two, patent 200910015535 " method for extinguishing underground gasification furnace by charging nitrogen ", the method installs nitrogen making machine on ground, the nitrogen made is filled with in gasification furnace by inlet channel, thus break off gasification furnace oxygen and put out a fire, and being constantly filled with in process, furnace heat is cemented out, discharge ground from extract duct and lower the temperature.The advantage of this invention is, because nitrogen does not burn not combustion-supporting, can play the object of disconnected oxygen, and is filled with in process constantly and is cemented out by after-heat in stove, makes residual coal no longer resume combustion in stove, realizes thoroughly going out stove.But because underground gasification furnace cavity volume is comparatively large, the nitrogen of needs is more, and circulation temperature lowering in use procedure, its economy is relatively poor.
Prior art three, patent 200910015541 (method for extinguishing underground gasification furnace by spraying mist) arranges shower nozzle in the induction port of ground inlet channel, nozzle connecting is connected on inlet channel, air blast limit water spray in Bian Xianglu, is distinguished and admirablely mixed into water smoke with water and enters in gasification furnace, water smoke is met incandescent gasification coal seam and is vaporized formation steam, discharge from exhaust passage, in said process carries out, furnace heat is constantly transferred to steam, thus reduce furnace temperature and displace oxygen, reach stove object of going out.This invention goes out stove method simply, and only in the inlet channel of aperture, install several shower nozzle, the steam formed in stove is not combustion-supporting not to burn, and make the out no longer resume combustion of furnace heat Rapid replacement, and Water usage is minimum, mine perviousness can not be caused to threaten.But the method shower nozzle decentralization process is complicated, poor operability.
Prior art four, patent 200910015542 " method for extinguishing underground gasification furnace with steam ", the method is at ground configuration steaming plant and steam pipeline, steam pipeline is connected on former inlet channel, in gasification furnace, steam is filled with by inlet channel, steam meets the further gasification reaction of furnace high-temperature, thus break off oxygen in gasification furnace and put out a fire, constantly be filled with absorbing and cooling temperature in process, furnace heat is cemented out, lower the temperature from discharge ground, exhaust passage, reach the object of the stove that fast and safely thoroughly goes out.This invention stove method of going out achieves the stove that thoroughly goes out fast, and can not by the object of permeable threat.But because underground gasification coal seam is darker, blast in the process of underground burned out area cooled at steam, cause the steam entering burned out area substantially to become water, it is better to the cooling effect of subregion, but the energy consumption of producing steam is comparatively large, and therefore economy is all relative with stove effect of going out poor.
Prior art five, patent 200910015540 " method for comprehensively extinguishing underground gasification furnace ", the method first adopt steam go out stove stop working, then air cooling-down is carried out with atomized water spray, finally adopt slip casting method injecting paste material close underground gasification furnace all enter outlet passageway, make underground gasification furnace and atmospheric isolation.This invention is comprehensively gone out stove method, faster than single stove method of going out, and can thoroughly go out stove for general about two months, because of limited with water and be all converted into steam and discharge, mine perviousness can not be caused to threaten.But the method process is complicated, and the ancillary service of needs is more, and operability also compares poor.
Prior art six, document " crane coal five ore deposit 21 coal spontaneous causes of spontaneous combustion analysis and synthesis Prevention Technique ", " utilize gel retardant preventing and extinguishing fire technology process down-hole is high emits a spontaneous combustionof coal ", " brief talk the application of gel fire extinguishing in coal production ", describe chemical gel process high temperature dot and leakage stopping technology, Roc stops/Ma Lisan sealing technique, preventing and extinguishing fire of coal mine agent MEA and building barrier material FSA combines the coal mine underground flame range spontaneous combustion treatment measures such as pressure injection sealing technique fast.But these measures all for mine fire prevention and improvement, are difficult to be applicable to underground gasification furnace and put out stove, substantially can not realize.
Prior art seven, patent US 20050011653A1 " PROCESS FOREXTINGUISHMENT OFUNDERGROUND COAL SEAM FIRES " proposes one and utilizes flame range heat in underground own to carry out heating lime stone slurries, slurries are heated and produce CO2, and then reach the method for fire extinguishing.The method cost is lower, realizes also being easier to, the lime stone slurry fire extinguishing that the method adopts, its large usage quantity, although cost is not high, is difficult to fully contact with apart from delivery port flame range far away, is applicable to the fire extinguishing of underground flame range among a small circle.
Prior art eight, patent US005909777A " METHOD AND APPARATUS FORSTOPPING THE SPREAD OF A FH2E IN AN UNDERGROUND MINE " proposes one prefabricated movable water pipe and nozzle under colliery, is difficult to solve fire fighter when underground fire occurs the problem entered.This patent mainly for a kind of solution that the situation of breaking out of fire in coal production or the resume combustion of abandoned mine well proposes, because underground gasification furnace has been difficult to people's down-hole operation, is therefore put out stove process at underground gasification and is not substantially possessed feasibility.
Summary of the invention
The present invention is intended to overcome above-mentioned at least one defect of the prior art.
The present invention proposes a kind of method for quenching underground coal gasifier, it utilizes negative pressure to improve underground water or the coal seam water permeability to gasification furnace cavity (burned out area), and then make water enter burned out area, reached by evaporation of water heat absorption and water vapour and high temperature coal seam endothermic heat of reaction and put out stove object.
In the present invention, negative pressure refers to that the gas pressure intensity in coal underground gasifying furnace in burned out area is less than the state of the hydrostatic pressure in burned out area surrounding environment.Burned out area surrounding environment comprises coal seam, rock stratum, water layer etc. around burned out area.
According to an aspect of the present invention, a kind of method for quenching underground coal gasifier is proposed, described coal underground gasifying furnace comprises burned out area and extends at least one pipeline on ground from burned out area, and described method comprises: connect induced draft fan in the exit of at least one pipeline described; Operation induced draft fan forms negative pressure with the gas extracted out in burned out area in burned out area, thus make the water in burned out area surrounding environment enter burned out area to realize putting out stove, wherein, take out in the process of negative pressure at least one pipeline of use, other pipeline do not used is closed.
Water in described burned out area surrounding environment can comprise at least one in the water in underground reservoir, inside, coal seam, coal seam surrounding rock body.
Method for quenching underground coal gasifier according to an embodiment of the invention, wherein, by being arranged on the gas pressure intensity in described ducted pressure measurer monitoring burned out area, in burned out area, forming negative pressure comprise the gas pressure intensity in burned out area is evacuated to not higher than predetermined pressure.Method for quenching underground coal gasifier according to an embodiment of the invention, wherein, described predetermined pressure is 40kpa.
Method for quenching underground coal gasifier according to an embodiment of the invention, wherein, described predetermined pressure is 0kpa.Method for quenching underground coal gasifier according to an embodiment of the invention, wherein, by being arranged on the temperature of described ducted thermo detector monitoring gas bleeding, when the temperature of gas bleeding is down to below 90 DEG C, stops gas bleeding.
Method for quenching underground coal gasifier according to an embodiment of the invention, wherein, after stopping gas bleeding, closes the outlet of described pipeline.
Method for quenching underground coal gasifier according to an embodiment of the invention, wherein, arranges multiple pipeline at the diverse location in gasification furnace region.
Alternatively, extracted out the gas in burned out area by multiple pipeline simultaneously.
Alternatively, extracted out the gas in burned out area in turn by multiple pipeline.
Preferably, described pipeline is the pipeline used in Underground Coal Gasification Process.
Described pipeline can be admission line or outlet pipe, described admission line in Underground Coal Gasification Process for passing into gasifying agent, described outlet pipe in Underground Coal Gasification Process for discharging gasification product.
Of the present inventionly put out stove method, compared with conventional method, easy and simple to handle, be easy to control, do not need additional too much equipment, cost is low, easy to implement.
Accompanying drawing explanation
Fig. 1 shows can the schematic diagram of coal underground gasifying furnace to implement the method.
Detailed description of the invention
Generally speaking, method for quenching underground coal gasifier of the present invention is the later stage in underground gasification furnace life cycle, by the gas in extraction burned out area to form negative pressure in burned out area, negative pressure is utilized to improve water in burned out area surrounding environment to the permeability in burned out area, thus water is introduced burned out area, the heat-absorbing action carrying out endothermic reaction generation by the cooling effect of water itself and evaporation of water heat-absorbing action and water vapour and high temperature coal seam reduces the temperature in coal seam, reaches the object putting out stove.
Invention applies Darcy's law.
Darcy's law:
Wherein, q representation unit time infiltration capacity, k represents transmission coefficient, and A represents infiltrating area, and Δ h represents head difference, and l represents the length of permeation pathway, the head difference of i representation unit length.
According to Darcy's law, the infiltration capacity of water in coal seam is directly proportional to barometric gradient (head difference), therefore, in coal seam, coal seam surrounding rock body and the indeclinable situation of AQUIFER HYDRAULIC, owing to producing negative pressure in burned out area, cause head difference to increase, thus the water yield that unit permeation area infiltrates in burned out area can increase.
Water after entering burned out area, evaporation endothermic under the original high temperature action of burned out area; And then, steam likely can with also there is following strong endothermic reaction (water gas reaction) at the carbon burnt or be in high temperature:
C+H
2O→CO+H
2-131.5MJ/kmol
As a result, underground gasification furnace heat is taken away by steam evaporation endothermic and water gas reaction heat absorption, and the partial heat in stove also can be taken away by the process that negative pressure taken out by induced draft fan in addition, causes in-furnace temperature to decline, thus reaches the object putting out stove.
Illustrate below in conjunction with object lesson and of the present inventionly put out stove method.
Embodiment 1
Fig. 1 shows can the schematic diagram of coal underground gasifying furnace to implement the method.As shown in Figure 1, typical coal underground gasifying furnace comprises some turnover gas drilling holes 1,2 and 3 of the diverse location being distributed in gasification furnace region, coal seam 4 and burned out area 5.Turnover gas drilling hole 1,2 and 3 extends to coal seam 4 from ground 6 via stratum 7.In coal gasification processes, boring 1 is used as inlet channel, and for passing into the various gasifying agents impelling coal combustion to gasify, boring 2 or 3 is used as outlet passageway, for discharging the gaseous product after coal combustion gasification.Another in boring 2 or 3 also can for the passage such as observed for other object.
In gasification, the burned out area 5 formed gradually in coal seam along with burning of coal is communicated with 3 with turnover gas drilling hole 1,2 respectively.In Underground Coal Gasification Process latter stage, along with continuing of gasifier operation time, burned out area 5 expands, in underground gasification furnace, the intensity of gasification declines, calorific value of gas reduces, gasification controllability dies down, at this moment represent that this underground gasification furnace has been bordering on the latter stage of gasifier operation, need to put out stove process to it, to ensure that subterranean coal does not burn away, saving resource, is also conducive to the gathering, the diffusion that prevent pollutant in underground environment, and prevents the ground settlement because cavity-growth causes thus affect the stable of stratum.
Concrete stove process of putting out is:
In the latter stage of gasification, when needs put out stove, be connected induced draft fan at original turnover gas drilling hole 1,2 of underground gasification furnace with the exit of 3; Operation induced draft fan, to continue from turnover gas drilling hole 1,2 and 3 or to be interrupted the gas outwards extracted out in burned out area, makes to produce negative pressure in burned out area, thus the water in burned out area surrounding environment is introduced burned out area, to realize putting out stove.Water in described burned out area surrounding environment comprises the water etc. in underground reservoir, inside, coal seam, coal seam surrounding rock body.Water in burned out area surrounding environment being introduced burned out area is instigate water in burned out area surrounding environment by hole, crack or passages such as coal seam, stratum, rock stratum, enters burned out area by the mode such as water burst, infiltration.
According to this embodiment, in turnover gas drilling hole 1,2 and 3, pressure measurer can be set respectively, to continue to monitor the pressure of gas bleeding, thus the pressure of monitoring burned out area.Pressure measurer can adopt known pressure gauge, vacuum meter etc., and near the outlet that can be arranged on boring, so that measure.When the pressure in burned out area is evacuated to predetermined pressure, negative pressure state can be formed in burned out area.Described predetermined pressure depends on the hydrostatic pressure in burned out area surrounding environment.Such as, the degree of depth on stratum residing for burned out area is different, and hydrostatic pressure is different, then described predetermined pressure also may be different.
But inventor finds, for the different coal degree of depth, when the pressure drop in burned out area is not to during higher than 40kpa, boring exit vapour content significantly increases, and exit gas temperature significantly declines, and shows to enter a large amount of water burst in burned out area.Therefore, the pressure in burned out area can be selected to be evacuated to not higher than 40kpa.Preferably the pressure in burned out area is evacuated to lower than 0kpa.Because burned out area is evacuated to lower pressure, is conducive to increasing barometric gradient, improves the rate of infiltration of water, thus contribute to putting out stove fast.
According to this embodiment, in turnover gas drilling hole 1,2 and 3, thermo detector can also be set respectively, such as thermocouple thermometer, to monitor the temperature of gas bleeding near such as outlet.Such as, when the temperature of gas bleeding is down to below 90 DEG C, shows that gasification in-furnace temperature is down to below the burning-point of coal, substantially reach and put out stove object.At this moment, close induced draft fan, stop gas bleeding.Subsequently, turnover gas drilling hole 1,2 and 3 can be closed, cut off outside air supply, to realize thoroughly putting out stove.
Put out stove method according to this embodiment, bled by three turnover gas drilling holes simultaneously, be conducive to reducing furnace pressure fast, thus improve the rate of infiltration of the water in surrounding environment to burned out area; Meanwhile, three turnover gas drilling holes are positioned at the diverse location in gasification furnace region, contribute to realizing equably taking out negative pressure, thus realize putting out stove fast.Further, utilize the turnover gas drilling hole of gasification furnace itself to bleed, need not increase other optional equipment, quenching furnace operation is simple and convenient.
Embodiment 2
Embodiment 2 to put out stove method substantially the same manner as Example 1, uniquely unlike, put out in stove process at the coal underground gasifying furnace shown in Fig. 1, extracted out the gas in burned out area 5 in turn by three turnover gas drilling holes 1,2 and 3, in the process, except by except the pipeline of gas that uses to extract out in burned out area, other pipeline is closed.The method also can realize taking out negative pressure fast and evenly, thus can realize putting out stove fast.
Other embodiment
What embodiment 1 and 2 described coal underground gasifying furnace of the present invention for concrete gasification furnace puts out stove method.But, the invention is not restricted to specific embodiment.Such as, according to the variant embodiment of embodiment 1 or 2, also can only be bled by one or two turnover gas drilling hole, close other turnover gas drilling hole simultaneously, also can reach and form negative pressure in burned out area, thus make the water in surrounding environment flow into burned out area, reach and put out stove object.
In addition, turnover gas drilling hole quantity be also not limited to three, but can be set to as required one, two, or more.
In addition, in above-described embodiment 1 and 2, the turnover gas drilling hole of gasification furnace itself is utilized to bleed, but, as required, other the pipeline leading to burned out area also can be adopted to bleed, also can realize object of the present invention.
In a word, as long as the condition of negative pressure in stove can be maintained, promote that underground reservoir, coal seam are inner, water seepage flow in the surrounding rock body of coal seam enter in stove, then by water evaporation and water gas reaction and bleed carry heat process by the temperature reduction in stove, all can realize of the present inventionly putting out stove object.When not departing from essence of the present invention, any distortion made for the present invention all within the scope of the invention.
Method for quenching underground coal gasifier of the present invention, compared with conventional method, easy and simple to handle, be easy to control, do not need additional too much equipment, cost is low, easy to implement.
Claims (9)
1. a method for quenching underground coal gasifier, described coal underground gasifying furnace comprises burned out area and extends at least one pipeline on ground from burned out area, and described method comprises:
Induced draft fan is connected in the exit of at least one pipeline described; And
Operation induced draft fan forms negative pressure with the gas extracted out in burned out area in burned out area, thus make the water in burned out area surrounding environment enter burned out area to realize putting out stove, wherein, take out in the process of negative pressure at least one pipeline of use, other pipeline do not used is closed;
Described pipeline is admission line or outlet pipe, described admission line in Underground Coal Gasification Process for passing into gasifying agent, described outlet pipe in Underground Coal Gasification Process for discharging gasification product;
By being arranged on the temperature of described ducted thermo detector monitoring gas bleeding, when the temperature of gas bleeding is down to below 90 DEG C, stop gas bleeding.
2. method for quenching underground coal gasifier according to claim 1, wherein, by being arranged on the gas pressure intensity in described ducted pressure measurer monitoring burned out area, in burned out area, forming negative pressure comprise the gas pressure intensity in burned out area is evacuated to not higher than predetermined pressure.
3. method for quenching underground coal gasifier according to claim 2, wherein, described predetermined pressure is 40kpa.
4. method for quenching underground coal gasifier according to claim 2, wherein, described predetermined pressure is 0kpa.
5. method for quenching underground coal gasifier according to claim 1, wherein, after stopping gas bleeding, closes the outlet of described pipeline.
6. method for quenching underground coal gasifier according to claim 1, wherein, arranges multiple described pipeline at the diverse location in gasification furnace region.
7. method for quenching underground coal gasifier according to claim 6, wherein, extracts the gas in burned out area out simultaneously by multiple pipeline.
8. method for quenching underground coal gasifier according to claim 6, wherein, extracts the gas in burned out area out in turn by multiple pipeline.
9. method for quenching underground coal gasifier according to claim 1, wherein, the water in described burned out area surrounding environment comprises at least one in the water in underground reservoir, inside, coal seam, coal seam surrounding rock body.
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Families Citing this family (6)
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| CN103422848B (en) * | 2013-09-06 | 2017-01-11 | 新奥气化采煤有限公司 | Underground coal gasification method and grouting device |
| CN103556980B (en) * | 2013-10-30 | 2016-06-01 | 新奥气化采煤有限公司 | Underground coal gasification method |
| CN103696752B (en) * | 2013-12-18 | 2017-02-15 | 新奥气化采煤有限公司 | Control method for underground gasification pollutants |
| CN104653166B (en) * | 2014-12-24 | 2019-02-12 | 新奥科技发展有限公司 | Charge for remittance amount control method and coal underground gasification method in Underground Coal Gasification Process |
| CN106522914B (en) * | 2016-11-18 | 2019-02-12 | 中为（上海）化学有限公司 | Underground gasification furnace parking and burned out area restoration processing method for coal underground gasifying technology |
| CN107083946B (en) * | 2017-06-12 | 2023-02-28 | 新疆国利衡清洁能源科技有限公司 | Method for extinguishing underground coal gasification furnace |
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Effective date of registration: 20170125 Address after: 065001 Hebei economic and Technological Development Zone, Langfang science and Technology Park in the Southern District of B building, room 522 Patentee after: ENN SCIENCE & TECHNOLOGY DEVELOPMENT Co.,Ltd. Address before: 065001 Langfang City Development Zone of Hebei province Huaxiang Patentee before: ENN Coal Gasification Co., Ltd. |