CN104122289B - A kind of underground coal gasification model test platform and test method - Google Patents
A kind of underground coal gasification model test platform and test method Download PDFInfo
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- CN104122289B CN104122289B CN201310299338.7A CN201310299338A CN104122289B CN 104122289 B CN104122289 B CN 104122289B CN 201310299338 A CN201310299338 A CN 201310299338A CN 104122289 B CN104122289 B CN 104122289B
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Abstract
The invention provides a kind of underground coal gasification model test platform, described testing table comprises gasification furnace and data acquisition system (DAS), described gasification furnace burner hearth all around and bottom be respectively arranged with flame retardant coating, heat-insulation layer, sealant and Withstand voltage layer successively from inside to outside; Described top of gasification furnace is provided with the pipeline exporting for supplied gas, input, and described pipeline is penetrated in the test coal layer of burner hearth inside by top of gasification furnace and is connected with gasification channel; Gasification furnace surrounding is provided with multiple viewport for observing gasification channel coal combustion situation in igniting process mid-point fire end coal seam and gasification; Gasification furnace is provided with multiple process parameter measurement hole for deriving coal gas and communication signal line; Apply this testing table can simulate and can carry out repeatedly underground coal gasification model test, the gasification simulating different angle and thickness coal seam can be realized, the motion conditions of roof and floor and table soil in research gasification.
Description
Technical field
The present invention relates to a kind of underground coal gasification model test platform and test method, belong to coal underground gasification technology field.
Background technology
Underground Coal Gasification Process belongs to fixed bed gasification process, and the bed of material can not move, and only has the movement by workplace, and namely the expansion in temperature field keeps the continuous of gasification, therefore requires that rig for model test must have enough physical dimensions.The low pressure gasifying testing table that U.S. LawerenceLivermoreNationalLaboratory set up in the eighties in last century, long 10m, wide 1m, high 1m, can observation place gasified temperature field spread scenarios, but seam inclination and top, coal seam, base plate and table soil situation can not be simulated.The high pressure subterranean gasification test platform that Aachen, Germany polytechnical university once set up, long 2m, diameter are 0.5m, can bear the pressure of 2.5MPa, but due to physical dimension little, vapor pressure is high, be difficult to observe there is underground gasification feature temperature field, pressure field spread scenarios.The low pressure underground gasification testing table that coal industry underground gasification ERC of China Mining University set up in 1986, long 6.8m, high 0.85m, wide 0.2m, the angle in gasification coal seam is simulated by integral hoisting, two-dimensional temperature field spread scenarios can be observed, but thickness of coal seam and top, coal seam, base plate and table soil situation can not be simulated, can not carry out the research of furnace type structure parameter and assisted gas metallization processes, and parameter measurement is all based on manual measurement.Therefore, setting up a multi-functional underground coal gasification(UCG) rig for model test is very necessary to the research carrying out coal in China underground gasification technology.
Summary of the invention
For solving prior art Problems existing, the invention provides a kind of underground coal gasification model test platform and test method, the concrete structure of this testing table is as follows:
A kind of underground coal gasification model test platform, its structure comprises gasification furnace and data acquisition system (DAS), described gasification furnace burner hearth vertical and horizontal section presents the U-shaped burner hearth of side opening, burner hearth all around and bottom be respectively arranged with flame retardant coating, heat-insulation layer, sealant and Withstand voltage layer successively from inside to outside; Described flame retardant coating is formed by the sizing of once casting of fire-resistant silicon materials, and described heat-insulation layer is be pasted onto rock-wool heat insulation plate inside sealant by high-temp glue; Described sealant is the casing using Plate Welding to become; Described Withstand voltage layer is the reinforced concrete floor formed by casting; By the base plate of simulation floor strata material-paving at burner hearth inner bottom surface, coal seam is filled with on base plate, by the top board of simulation roof strata material-paving on coal seam, it is topsoil on top board, heat-insulation layer is provided with on topsoil, be provided with cover plate on heat-insulation layer, described bottom is longitudinally provided with gasification channel and gas channel along gasification furnace;
Described top of gasification furnace is provided with the pipeline exporting for supplied gas, input, and described pipeline is penetrated in the test coal layer of burner hearth inside by top of gasification furnace and is connected with gasification channel;
Described gasification furnace surrounding is provided with multiple viewport for observing gasification channel coal combustion situation in igniting process mid-point fire end coal seam and gasification;
Described gasification furnace is provided with multiple process parameter measurement hole for deriving coal gas and communication signal line;
Described data acquisition system (DAS) comprise some strain gauges for measuring roof pressure and displacement and displacement transducer, measuring tempeature thermopair, for deriving stainless-steel tube and the data acquisition equipment of gas, described thermopair is arranged in burner hearth in tested coal seam, is connected with the temperature data checkout equipment of gasification furnace outside by compensating wire; One end of described stainless-steel tube is arranged on directly over the gasification channel in tested coal seam, and stainless-steel tube is connected with the gas data collecting device of gasification furnace outside through process parameter measurement hole.
The heat-insulation layer of above-mentioned underground coal gasification model test platform is divided into the first insulation and the second insulation from bottom to top, and the clay seam of the first heat-insulation layer to be thickness be 0.5m, the second heat-insulation layer is the rock wool layer that 0.1m is thick.
Above-mentioned underground coal gasification model test platform, its concrete structure is gasification furnace superintendent 4.45m, wide 1.17m, high 1.57m; The flame retardant coating thickness of described gasification furnace is 0.15m; The insulation layer thickness of described gasification furnace is 0.6m; The sealant thickness of described gasification furnace is 20mm; The left side wall thickness of the Withstand voltage layer of described gasification furnace is greater than right side wall thickness, and left side wall thickness is 0.4m, and right side wall thickness is 0.3m; The bar-mat reinforcement of the Withstand voltage layer of described gasification furnace replaces placement by the unequal two kinds of reinforcing bars of diameter and forms; Described gasification furnace is provided with 4 viewports; Described gasification furnace is provided with 19 process parameter measurement holes.
Be applied to a test method for above-mentioned testing table, its step comprises as follows:
Step 1-layout testing ground step: according to the hydrogeologic data of industry spot, fill successively from bottom gasification furnace from scene extract or with analog material build casting base plate, coal seam, top board, water-bearing zone, rock stratum and table soil, its thickness by on-the-spot actual (real) thickness 1/10 ~ 1/30 geometry contracting than determining; 50 ~ 100mm heat preservation rock is covered above topsoil;
The step of step 2-layout pipeline and passage: in described coal seam, a gasification channel is set along body of heater longitudinal direction, gasification channel longitudinal cross-section is 50 × 50mm ~ 100mm × 100mm, in gasification channel, a dump is set every 0.5 ~ 1m, the sectional area of dump accounts for 1/3 ~ 1/2 of gasification channel sectional area, forms variable cross section gasification channel;
At gasification channel every 0.5 ~ 1 meter; arrange a gas channel along tilted upward direction, coal seam, adopt trapezoidal refractory concrete bracket support, gas channel cross section is 50 × 50mm ~ 100mm × 100mm; and be connected with the boring in described top board, form inlet, outlet passage and accessory channel; Several cross sections that are crisscross arranged in the coal seam of gas channel both sides are the loose crack of little Mang lane as coal seam of 25 × 25mm ~ 50mm × 50mm;
Select the pipeline at top of gasification furnace two ends as air admission hole and venthole, two pipelines of crown center are via hole, by air admission hole gas injection, close venthole and via hole, carry out gasification furnace air-tight test;
The step of step 3-arrange measurement point: some strain gauges and displacement transducer are set in described top board; In described coal seam, arrange 4 ~ 6 row × 15 ~ 19 row temperature measuring point, each temperature measuring point arranges one for measuring the thermopair of coal seam temperature in gasification; In described coal seam, arrange 1 ~ 3 row × 5 ~ 10 row pressure and gas composition measurement point, each pressure and gas composition measurement point arrange one for the coal gas in gasification channel being guided to the stainless-steel tube of gasification furnace outside simultaneously;
The step of step 4-simulation gasification: first light a fire, successfully blasts the vaporized chemicals such as air in backward gasification furnace when lighting a fire;
The step of step 5-observation data: the pressure and the component that are detected coal seam temperature, coal gas in gasification channel by thermopair, pressure unit and online gc, obtain the related data that in gasification channel, temperature field, pressure field and concentration field are expanded;
Coal seam forms burned out area through burning, causes superincumbent stratum inbreak, by the strain gauge in top board and displacement transducer, and the STRESS VARIATION in observation top board and the displacement of inbreak part, the motion process of top board and table soil in research superincumbent stratum.
Simulating gasification in step 4 in above-mentioned steps can be simulated air gasification; Its sub-step is: when lighting a fire successfully, in gasification furnace, blast 0 ~ 20m
3the air of/h, as H in coal gas
2content be the content of 10-20%, CO be 5-15%, calorific value reaches 3.3-5.1MJ/m
3and this state continues to keep 4-8 constantly little, the air mass flow observed is the technological parameter of applicable described gasification.
Simulating gasification in step 4 in above-mentioned steps can be simulation oxygen-rich gasification process; Its sub-step is: when lighting a fire successfully, and blast to described gasification furnace the vaporized chemical that oxygen-rich concentration is 21% ~ 100%, in coal gas, available gas component and calorific value increase with the raising of oxygen-rich concentration, available gas component CO+H
2+ CH
4variation range be 25% ~ 70%, calorific value is 3.3 ~ 10.5MJ/m
3, the gas componant observed, calorific value are the technological parameter of applicable described gasification.
Simulating gasification in step 4 in above-mentioned steps can be simulation oxygen enrichment-steam gasification process; Its sub-step is when lighting a fire successfully, first in gasification furnace, blasts the vaporized chemical that oxygen-rich concentration is 21%, then improves constantly oxygen-rich concentration, is gasification furnace savings energy, when oxygen-rich concentration reaches 40% ~ 100%, keeps oxygen enrichment flow to be 6 ~ 20m by combustion heat release
3/ h, steam oxygen ratio is 0.5:1 ~ 2:1, carries out oxygen enrichment-steam gasification model test, as H in coal gas within the scope of described oxygen-rich concentration, oxygen enrichment flow and steam oxygen ratio
2content be 30% ~ 45%, H
2the content of/CO is than being 1.5:1 ~ 3:1, and calorific value of gas is at 7MJ/m
3time above, the oxygen-rich concentration observed, oxygen enrichment flow and steam oxygen ratio are the technological parameter of applicable described gasification.
Simulating gasification in step 4 in above-mentioned steps can be simulation oxygen enrichment-CO
2gasification; Its sub-step is: light a fire successfully, blasts oxygen enrichment-CO in gasification furnace
2vaporized chemical, oxygen-rich concentration is at 40% ~ 90% (CO
2: 60% ~ 10%) adjust, the observation component of coal gas and calorific value, when the content of CO in coal gas be 6 ~ 20%, CO
2content be 40 ~ 55%, H
2content be 20 ~ 40%, and calorific value of gas is greater than 6MJ/m
3time, the oxygen-rich concentration observed, CO
2concentration and vaporized chemical flow are the technological parameter of applicable described gasification.
Simulating gasification in step 4 in above-mentioned steps can be simulation coal seam reverse combustion gasification; Its sub-step is: first at a side igniting of coal seam gasification passage, light a fire successfully, the vaporized chemical that oxygen-rich concentration is 21% ~ 60% is blasted again from opposite side injecting hole, burning things which may cause a fire disaster is guided to move from gasification channel igniting side direction gas injection side, namely flame face moves against air current flow direction, completes the gasification in coal seam.
Simulating gasification in step 4 in above-mentioned steps can be that simulation coal seam is forward and reverse for vaporized chemical process of the test; Its sub-step is: by air admission hole air feed, flame range moves to venthole, and when flame range moves to bottom venthole, zone of reduction and destructive distillation band disappearance, now change by former venthole air feed, former air admission hole is given vent to anger, and again forms gasification reaction band, improves gasification rate of coal seam.
The testing table that application the present invention proposes and test method are for different technological parameters and production decision, repeatedly underground coal gasification model test can be carried out, the gasification simulating different angle and thickness coal seam can be realized, the motion conditions of roof and floor and table soil in research gasification, instrument can be utilized to measure the expansion process of temperature field in coal seam, concentration field and pressure field objectively simultaneously, and contribute to the research carrying out furnace type structure parameter and assisted gas metallization processes, to determine technological parameter and the production decision of suitable field condition.
Accompanying drawing explanation
Fig. 1 is testing table gasification furnace structure sectional view;
Fig. 2 is testing table gasification furnace structure vertical view;
Fig. 3 simulates coal underground gasifying furnace texture of coal seam figure;
Fig. 4 is simulation underground coal gasification(UCG) testing table temperature and gets gas point arrangenent diagram;
Fig. 5 is strain gauge and the displacement transducer arrangenent diagram of simulation underground coal gasification(UCG) testing table gasification furnace top board.
Embodiment
Below in conjunction with drawings and Examples, the present invention is described further:
Embodiment 1
As shown in Figure 1, 2, the concrete structure of the testing table in the present embodiment is as follows:
Underground coal gasification model test platform, its structure comprises gasification furnace and data acquisition system (DAS), described gasification furnace burner hearth vertical and horizontal section presents the U-shaped burner hearth of side opening, burner hearth all around and bottom be respectively arranged with flame retardant coating 1, heat-insulation layer 2, sealant 3 and Withstand voltage layer 4 from inside to outside successively; Described flame retardant coating is formed by the sizing of once casting of fire-resistant silicon materials, and described heat-insulation layer is be pasted onto rock-wool heat insulation plate inside sealant by high-temp glue; Described sealant is the casing using Plate Welding to become; Described Withstand voltage layer is the reinforced concrete floor formed by casting; By the base plate 12 of simulation floor strata material-paving at burner hearth inner bottom surface, coal seam 11 is filled with on base plate, by the top board 9 of simulation roof strata material-paving on coal seam, it is topsoil 8 on top board, heat-insulation layer is provided with on topsoil, be provided with cover plate 6 on heat-insulation layer, described bottom is longitudinally provided with gasification channel 14 and gas channel 13 along gasification furnace;
Described top of gasification furnace is provided with the pipeline 5 exporting for supplied gas, input, and described pipeline is penetrated in the test coal layer of burner hearth inside by top of gasification furnace and is connected with gasification channel;
Described gasification furnace surrounding is provided with multiple viewport 16 for observing gasification channel coal combustion situation in igniting process mid-point fire end coal seam and gasification;
Described gasification furnace is provided with multiple process parameter measurement hole 18 for deriving coal gas and communication signal line;
Described data acquisition system (DAS) comprises some sensors 15 for measuring roof pressure and displacement, described sensor be strain gauge and displacement transducer, measuring tempeature thermopair 17, for deriving stainless-steel tube and the data acquisition equipment of gas, described thermopair is arranged in burner hearth in tested coal seam, is connected with the temperature data checkout equipment of gasification furnace outside by compensating wire; One end of described stainless-steel tube is arranged on directly over the gasification channel in tested coal seam, and stainless-steel tube is connected with the gas data collecting device of gasification furnace outside through process parameter measurement hole.
In embodiment, described simulation floor strata or simulation roof strata adopt fire cement and aggregate in the ratio mixing cast of 1:3 or the simulation rock stratum that uses on-the-spot actual material-paving to be formed according to on-the-spot strata structure.
The correlation parameter of the testing table in the present embodiment is: described gasification furnace superintendent 4.45m, wide 1.17m, high 1.57m; The flame retardant coating thickness of described gasification furnace is 0.15m; The insulation layer thickness of described gasification furnace is 0.15m; The sealant thickness of described gasification furnace is 20mm; The left thickness of the Withstand voltage layer of described gasification furnace is greater than right thickness, and left side is thick is 0.4m, and right side is thick is 0.3m; The reinforcing bar of a φ 20mm is set every 0.25m distance in the Withstand voltage layer of described gasification furnace, between φ 20mm reinforcing bar, welds the reinforcing bar of φ 10mm simultaneously again, form a bar-mat reinforcement, cast in concrete; Described gasification furnace is provided with 4 viewports; Described gasification furnace is provided with 19 process parameter measurement holes.
Embodiment 2
Be applied to a test method for testing table described in embodiment 1, the step of described test method comprises:
Step 1-layout testing ground: according to the hydrogeologic data of industry spot, fill successively from bottom gasification furnace from scene extract or with analog material build casting base plate, coal seam, top board, water-bearing zone, rock stratum and table soil, its thickness by on-the-spot actual (real) thickness 1/10 ~ 1/30 geometry contracting than determining; 50 ~ 100mm heat preservation rock is covered above topsoil;
Step 2-layout pipeline and passage: in described coal seam, a gasification channel is set along body of heater longitudinal direction, gasification channel longitudinal cross-section is 50 × 50mm ~ 100mm × 100mm, in gasification channel, a dump is set every 0.5 ~ 1m, the sectional area of dump accounts for 1/3 ~ 1/2 of gasification channel sectional area, forms variable cross section gasification channel;
At gasification channel every 0.5 ~ 1 meter; arrange a gas channel along tilted upward direction, coal seam, adopt trapezoidal refractory concrete bracket support, gas channel xsect is 50 × 50mm ~ 100mm × 100mm; and be connected with the boring in described top board, form inlet, outlet passage and accessory channel; Several cross sections that are crisscross arranged in the coal seam of gas channel both sides are the loose crack of little Mang lane as coal seam of 25 × 25mm ~ 50mm × 50mm;
Select the pipeline at top of gasification furnace two ends as air admission hole and venthole, the pipeline of crown center is via hole, by air admission hole gas injection, closes venthole and via hole, carries out gasification furnace air-tight test;
Step 3-measurement point is set: some strain gauges and displacement transducer are set in described top board; In described coal seam, arrange 4 ~ 6 row × 15 ~ 19 row temperature measuring point, each temperature measuring point arranges one for measuring the thermopair of coal seam temperature in gasification; In described coal seam, arrange 1 ~ 3 row × 5 ~ 10 row pressure and gas composition measurement point, each pressure and gas composition measurement point arrange one for the coal gas in gasification channel being guided to the stainless-steel tube of gasification furnace outside simultaneously;
Step 4-simulation gasification: first light a fire, successfully blasts the vaporized chemicals such as air in backward gasification furnace when lighting a fire;
Step 5-observation data: the pressure and the component that are detected coal seam temperature, coal gas in gasification channel by thermopair, pressure unit and online gc, obtain the related data that in gasification channel, temperature field, pressure field and concentration field are expanded;
Coal seam forms burned out area through burning, causes superincumbent stratum inbreak, by the strain gauge in top board and displacement transducer, and the STRESS VARIATION in observation top board and the displacement of inbreak part, the motion process of top board and table soil in research superincumbent stratum.
The simulation gasification of step 4 described in this enforcement has various procedures, wherein:
1, the simulation gasification of described step 4 is simulated air gasifications; Its sub-step is: when lighting a fire successfully, in gasification furnace, blast 0 ~ 20m
3the air of/h, as H in coal gas
2content be the content of 10-20%, CO be 5-15%, calorific value reaches 3.3-5.1MJ/m
3and this state continues to keep 4-8 constantly little, the air mass flow observed is the technological parameter of applicable described gasification.
, 2, the simulation gasification of the step 4 of described method is simulation oxygen-rich gasification process; Its sub-step is: when lighting a fire successfully, and blast to described gasification furnace the vaporized chemical that oxygen-rich concentration is 21% ~ 100%, in coal gas, available gas component and calorific value increase with the raising of oxygen-rich concentration, available gas component CO+H
2+ CH
4content scope be 25% ~ 70%, calorific value is 3.3 ~ 10.5MJ/m
3, the gas componant observed, calorific value are the technological parameter of applicable described gasification.
3, the simulation gasification of the step 4 of described method is simulation oxygen enrichment-steam gasification process; Its sub-step is when lighting a fire successfully, first in gasification furnace, blasts the vaporized chemical that oxygen-rich concentration is 21%, then improves constantly oxygen-rich concentration, is gasification furnace savings energy, when oxygen-rich concentration reaches 40% ~ 100%, keeps oxygen enrichment flow to be 6 ~ 20m by combustion heat release
3/ h, steam oxygen ratio is 0.5:1 ~ 2:1, carries out oxygen enrichment-steam gasification model test, as H in coal gas within the scope of described oxygen-rich concentration, oxygen enrichment flow and steam oxygen ratio
2content be 30% ~ 45%, H
2the content of/CO is than being 1.5:1 ~ 3:1, and calorific value of gas is at 7MJ/m
3time above, the oxygen-rich concentration observed, oxygen enrichment flow and steam oxygen ratio are the technological parameter of applicable described gasification.
4, the simulation gasification of the step 4 of described method is simulation oxygen enrichment-CO
2gasification; Its sub-step is: light a fire successfully, blasts oxygen enrichment-CO in gasification furnace
2vaporized chemical, oxygen-rich concentration is at 40% ~ 90% (CO
2: 60% ~ 10%) adjust, the observation component of coal gas and calorific value, when the content of CO in coal gas be 6 ~ 20%, CO
2content be 40 ~ 55%, H
2content be 20 ~ 40%, and calorific value of gas is greater than 6MJ/m
3time, the oxygen-rich concentration observed, CO
2concentration and vaporized chemical flow are the technological parameter of applicable described gasification.
5, the simulation gasification of the step 4 of described method is simulation coal seam reverse combustion gasification; Its sub-step is: first at a side igniting of coal seam gasification passage, light a fire successfully, the vaporized chemical that oxygen-rich concentration is 21% ~ 60% is blasted again from opposite side injecting hole, burning things which may cause a fire disaster is guided to move from gasification channel igniting side direction gas injection side, namely flame face moves against air current flow direction, completes the gasification in coal seam.
6, the simulation gasification of the step 4 of described method is that simulation coal seam is forward and reverse for vaporized chemical process of the test; Its sub-step is: by air admission hole air feed, flame range moves to venthole, and when flame range moves to bottom venthole, zone of reduction and destructive distillation band disappearance, now change by former venthole air feed, former air admission hole is given vent to anger, and again forms gasification reaction band for improving gasification rate of coal seam.
Embodiment 3
For individual layer wild goose brown coal hydrogasification process, see accompanying drawing 1-5.
In the preparatory stage of test, according to the hydrogeologic data at scene, first make with simulation floor strata (fire cement and aggregate are poured into a mould in the ratio mixing of 1:3) base plate 12 that inclination angle is 17 °; Tile long 4.45m with bulk raw coal again, incline long 1.5m, thickness 0.5m, inclination angle 17
0coal seam 11, need the accessory channel of gas channel 13, two long 1m of gasification channel 14, two long 1m of a processing long 4m in described coal seam; Above gasification channel, arrange that gas point 23 got by (5 row × 17 arrange) nickel chromium triangle-Nickel-Silicom thermocouple 17 and (3 row × 9 arrange) φ 8 stainless-steel tube as shown in Figure 4, pressure unit and on-line chromatograph is adopted to detect pressure and the component of coal gas in gasification channel, in order to form variable cross section gasification channel, passage section area is 0.1 × 0.1 ~ 0.13 × 0.13m
2, be naked coal channel, and arrange a flow-disturbing dump 22 every 0.5m in gasification channel, the sectional area of dump accounts for 1/3 of gasification channel sectional area, forms variable cross section gasification channel; In coal seam, be also provided with the loose crack 20 of the actual geological condition of simulation, in coal seam, be provided with ladder-shaped support 19, be used for supporting gas channel; Described gas channel and the cross-sectional area of accessory channel are 0.1 × 0.1 ~ 0.13 × 0.13m
2, be connected with the boring in superincumbent stratum, formed into and out of pore and via hole; Two groups of electrical igniters are placed in gasification channel air admission hole side after described passage and point layout; Then at the simulation top board 9 that coal seam poured thereon 20mm is thick; In top board, arrange some sensors 15 as shown in Figure 5, wherein 6 strain gauges and 6 displacement transducers are alternately arranged according to every row two row respectively, and top board is poured into a mould by the ratio mixing of 1:3 with fire cement and aggregate; Finally form topsoil 8 and the first heat-insulation layer 10 with clay and sillar respectively by tamping above top board, its thickness is 0.5m; In order to reduce heat waste, on clay, cover the thick rock wool of 0.1m again as the second heat-insulation layer 7; When installing the measurement mechanism such as temperature, pressure, Stress and displacement, by compensating wire, getting tracheae and signal transmssion line passes from process parameter measurement hole 18, coupling together with external data acquisition system.
After the measurement mechanisms such as the filler in gasification furnace, temperature, pressure, Stress and displacement install, with steel cover plate 6, gasification furnace sealing is got up, and by four pipelines 5, cover plate, rock-wool heat insulation plate, table soil, top board and gas channel is passed successively as into and out of tracheae, to be placed in coal seam directly over gasification channel, then cold test is carried out, and tune-up data acquisition system, when cold test is qualified, fire trial is got final product after data acquisition system (DAS) is stable, by fired state viewport 16, the ruuning situation of gasification furnace can be observed.
When lighting a fire, first in gasification furnace, blasting air, the inflammable gas accumulated in displacement stove, igniting of then closing a floodgate, first starting a lighter and lighting a fire in seed region 21, after 10min, starting No. two lighters.Then blast a small amount of pure oxygen combustion-supporting, preheating gasification furnace, and reduce the blow rate required gradually, until stop blasting air, continue to blast pure oxygen, observe furnace temperature change by temp measuring system.After gasifier temperature raises (temperature field is greater than 1000 DEG C), by testing program, adjustment drum oxygen amount, reaches designing requirement, enters normal pure oxygen (oxygen enrichment), pure oxygen (oxygen enrichment)--and water vapour is tested.
In process of the test, first the selection of operating parameter is carried out, namely under different pure oxygens (oxygen enrichment)-water vapour ratio condition, gasification test is carried out, adjusting process operating parameter is to obtain synthetic gas up to standard, then carry out continuous gasification, investigate gasification stability, and with the carrying out of gasification, utilize the data such as temperature, pressure and gas composition gathered, analyze the propagation law of temperature field in gasification channel, pressure field and concentration field.
This test is from producing qualified coal gas, and terminate to not producing qualified coal gas, effective vaporization time is 150 hours, experienced by the gasification of pure oxygen (98%) forward, oxygen enrichment (93%)-water vapour forward gasification.
After gasification furnace igniting, first blast pure oxygen (2.4m
3/ h) combustion-supporting, air inlet side coal combustion, coal seam temperature slowly rises.Increasing drum oxygen amount after 2h is 6.0m
3/ h, enters pure oxygen (98%) forward gasifying stage.This stage coal has gasified 26 hours altogether, and combustion reaction aggravates, and coal seam accumulation of heat, gasifier temperature significantly improves.H in outlet coal gas
2content reaches 30%-40%, and CO content is up to more than 20%, and available gas content on average reaches about 58%, H
2/ CO=1.58, calorific value of gas 9.13MJ/m
3left and right.
As available gas content (H in pure oxygen gasification outlet coal gas
2+ CO) lower than 60% time, then adopt oxygen enrichment-H
2o (g) gasifying process, this stage continue for 124 hours altogether.Considering that the concentration of extensive in actual production process, economic oxygen is generally about 93%, because this has been oxygen enrichment (93%)-water vapour forward continuous gasification test, selecting vapour oxygen volume ratio to be 1.5:1 ~ 2:1.Be 9.76m in process of the test
3/ h, regulates amount of steam, maintains H in gas composition
2: 35%-45%, CO:20%-30%, (H
2+ CO) % is more than or equal to 60%.Work as H
2when content is lower, suitably increase amount of steam; When CO content lower than 20% time, suitably reduce amount of steam.CH in coal gas
4content is less than 5%, and calorific value of gas is 9.03 ~ 11.11MJ/m
3.
In process of the test, along with burning and the carrying out of gasification reaction, burned out area in coal seam constantly increases, top board generation inbreak, cause top board and the raw displacement of table local products, utilize the Stress and displacement sensor in top board, monitor the Stress and displacement change procedure of top board in inbreak excessively and connect each other, the motion conditions of table soil and top board in research gasification.
Claims (7)
1. one kind is applied to the test method of underground coal gasification model test platform, it is characterized in that, described testing table comprises gasification furnace and data acquisition system (DAS), described gasification furnace burner hearth vertical and horizontal section presents the U-shaped burner hearth of side opening, burner hearth all around and bottom be respectively arranged with flame retardant coating, heat-insulation layer, sealant and Withstand voltage layer successively from inside to outside; Described flame retardant coating is formed by the sizing of once casting of fire-resistant silicon materials, and described heat-insulation layer is be pasted onto rock-wool heat insulation plate inside sealant by high-temp glue; Described sealant is the casing using Plate Welding to become; Described Withstand voltage layer is the reinforced concrete floor formed by casting; By the base plate of simulation floor strata material-paving at burner hearth inner bottom surface, coal seam is filled with on base plate, by the top board of simulation roof strata material-paving on coal seam, it is topsoil on top board, heat-insulation layer is provided with on topsoil, be provided with cover plate on heat-insulation layer, described bottom is longitudinally provided with gasification channel and gas channel along gasification furnace;
Described top of gasification furnace is provided with the pipeline exporting for supplied gas, input, and described pipeline is penetrated in the test coal layer of burner hearth inside by top of gasification furnace and is connected with gasification channel;
Described gasification furnace surrounding is provided with multiple viewport for observing gasification channel coal combustion situation in igniting process mid-point fire end coal seam and gasification;
Described gasification furnace is provided with multiple process parameter measurement hole for deriving coal gas and communication signal line;
Described data acquisition system (DAS) comprise some strain gauges for measuring roof pressure and displacement and displacement transducer, measuring tempeature thermopair, for deriving stainless-steel tube and the data acquisition equipment of gas, described thermopair is arranged in burner hearth in tested coal seam, is connected with the temperature data checkout equipment of gasification furnace outside by compensating wire; One end of described stainless-steel tube is arranged on directly over the gasification channel in tested coal seam, and stainless-steel tube is connected with the gas data collecting device of gasification furnace outside through process parameter measurement hole;
The step of described test method comprises:
Step 1-layout testing ground step: according to the hydrogeologic data of industry spot, fill successively from bottom gasification furnace from scene extract or with analog material build casting base plate, coal seam, top board, water-bearing zone, rock stratum and table soil, its thickness by on-the-spot actual (real) thickness 1/10 ~ 1/30 geometry contracting than determining; 50 ~ 100mm heat preservation rock is covered above topsoil;
The step of step 2-layout pipeline and passage: in described coal seam, a gasification channel is set along body of heater longitudinal direction, gasification channel longitudinal cross-section is 50 × 50mm ~ 100mm × 100mm, in gasification channel, a dump is set every 0.5 ~ 1m, the sectional area of dump accounts for 1/3 ~ 1/2 of gasification channel sectional area, forms variable cross section gasification channel;
At gasification channel every 0.5 ~ 1 meter; arrange a gas channel along tilted upward direction, coal seam, adopt trapezoidal refractory concrete bracket support, gas channel xsect is 50 × 50mm ~ 100mm × 100mm; and be connected with the boring in described top board, form inlet, outlet passage and accessory channel; Several cross sections that are crisscross arranged in the coal seam of gas channel both sides are the loose crack of little Mang lane as coal seam of 25 × 25mm ~ 50mm × 50mm;
Select the pipeline at top of gasification furnace two ends as air admission hole and venthole, the pipeline of crown center is via hole, by air admission hole gas injection, closes venthole and via hole, carries out gasification furnace air-tight test;
The step of step 3-arrange measurement point: some strain gauges and displacement transducer are set in described top board; In described coal seam, arrange 4 ~ 6 row × 15 ~ 19 row temperature measuring point, each temperature measuring point arranges one for measuring the thermopair of coal seam temperature in gasification; In described coal seam, arrange 1 ~ 3 row × 5 ~ 10 row pressure and gas composition measurement point, each pressure and gas composition measurement point arrange one for the coal gas in gasification channel being guided to the stainless-steel tube of gasification furnace outside simultaneously;
The step of step 4-simulation gasification: first light a fire, successfully blasts the vaporized chemicals such as air in backward gasification furnace when lighting a fire;
The step of step 5-observation data: the pressure and the component that are detected coal seam temperature, coal gas in gasification channel by thermopair, pressure unit and online gc, obtain the related data that in gasification channel, temperature field, pressure field and concentration field are expanded;
Coal seam forms burned out area through burning, causes superincumbent stratum inbreak, by the strain gauge in top board and displacement transducer, and the STRESS VARIATION in observation top board and the displacement of inbreak part, the motion process of top board and table soil in research superincumbent stratum.
2. method according to claim 1, is characterized in that, the simulation gasification of the step 4 of described method is simulated air gasification; Its sub-step is: when lighting a fire successfully, in gasification furnace, blast 0 ~ 20m
3the air of/h, as H in coal gas
2content be the content of 10-20%, CO be 5-15%, calorific value reaches 3.3-5.1MJ/m
3and this state continues to keep 4-8 constantly little, the air mass flow observed is the technological parameter of applicable described gasification.
3. method according to claim 1, is characterized in that, the simulation gasification of the step 4 of described method is simulation oxygen-rich gasification process; Its sub-step is: when lighting a fire successfully, and blast to described gasification furnace the vaporized chemical that oxygen-rich concentration is 21% ~ 100%, in coal gas, available gas component and calorific value increase with the raising of oxygen-rich concentration, available gas component CO+H
2+ CH
4content scope be 25% ~ 70%, calorific value is 3.3 ~ 10.5MJ/m
3, the gas componant observed, calorific value are the technological parameter of applicable described gasification.
4. method according to claim 1, is characterized in that the simulation gasification of the step 4 of described method is simulation oxygen enrichment-steam gasification process; Its sub-step is when lighting a fire successfully, first in gasification furnace, blasts the vaporized chemical that oxygen-rich concentration is 21%, then improves constantly oxygen-rich concentration, is gasification furnace savings energy, when oxygen-rich concentration reaches 40% ~ 100%, keeps oxygen enrichment flow to be 6 ~ 20m by combustion heat release
3/ h, steam oxygen ratio is 0.5:1 ~ 2:1, carries out oxygen enrichment-steam gasification model test, as H in coal gas within the scope of described oxygen-rich concentration, oxygen enrichment flow and steam oxygen ratio
2content be 30% ~ 45%, H
2the content of/CO is than being 1.5:1 ~ 3:1, and calorific value of gas is at 7MJ/m
3time above, the oxygen-rich concentration observed, oxygen enrichment flow and steam oxygen ratio are the technological parameter of applicable described gasification.
5. method according to claim 1, is characterized in that the simulation gasification of the step 4 of described method is simulation oxygen enrichment-CO
2gasification; Its sub-step is: light a fire successfully, blasts oxygen enrichment-CO in gasification furnace
2vaporized chemical, oxygen-rich concentration in 40% ~ 90% adjustment, the observation component of coal gas and calorific value, when the content of CO in coal gas be 6 ~ 20%, CO
2content be 40 ~ 55%, H
2content be 20 ~ 40%, and calorific value of gas is greater than 6MJ/m
3time, the oxygen-rich concentration observed, CO
2concentration and vaporized chemical flow are the technological parameter of applicable described gasification.
6. method according to claim 1, is characterized in that, the simulation gasification of the step 4 of described method is simulation coal seam reverse combustion gasification; Its sub-step is: first at a side igniting of coal seam gasification passage, light a fire successfully, the vaporized chemical that oxygen-rich concentration is 21% ~ 60% is blasted again from opposite side injecting hole, burning things which may cause a fire disaster is guided to move from gasification channel igniting side direction gas injection side, namely flame face moves against air current flow direction, completes the gasification in coal seam.
7. method according to claim 1, is characterized in that, the simulation gasification of the step 4 of described method is that simulation coal seam is forward and reverse for vaporized chemical process of the test; Its sub-step is: by air admission hole air feed, flame range moves to venthole, and when flame range moves to bottom venthole, zone of reduction and destructive distillation band disappearance, now change by former venthole air feed, former air admission hole is given vent to anger, and again forms gasification reaction band for improving gasification rate of coal seam.
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| CN112147269B (en) * | 2020-09-30 | 2021-08-31 | 中国矿业大学(北京) | Laboratory analog simulation device for simulating gasification process of underground coal seam |
| CN112647923A (en) * | 2020-12-24 | 2021-04-13 | 山东科技大学 | Simulation test device and method for large-scale coal underground gasification similar material |
| CN114086941B (en) * | 2021-12-06 | 2023-09-19 | 扎赉诺尔煤业有限责任公司 | Test device and method for simulating underground coal gasification |
| CN114412432B (en) * | 2021-12-28 | 2024-02-09 | 中国矿业大学 | Underground coal gasification along-path sampling simulation experiment system and method |
| CN115539009A (en) * | 2022-10-17 | 2022-12-30 | 安徽理工大学 | Test system and method for measuring underground coal gasification efficiency |
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