CN103711471B - Underground gasification furnace and the starting method of ground corollary system - Google Patents

Underground gasification furnace and the starting method of ground corollary system Download PDF

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CN103711471B
CN103711471B CN201310717501.7A CN201310717501A CN103711471B CN 103711471 B CN103711471 B CN 103711471B CN 201310717501 A CN201310717501 A CN 201310717501A CN 103711471 B CN103711471 B CN 103711471B
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gasification furnace
underground gasification
oxygen
load
separation unit
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CN103711471A (en
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陈�峰
路江鸿
张树川
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ENN Science and Technology Development Co Ltd
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ENN Coal Gasification Mining Co Ltd
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Abstract

The present invention relates to the starting method of a kind of underground gasification furnace and ground corollary system.Underground gasification furnace and the starting method of ground corollary system, including following step the most successively: inject gasifying agent coal seam of igniting to underground gasification furnace；When the oxygen consumption of underground gasification furnace is consistent with the amount of the oxygen produced corresponding to the minimum driving load of air separation unit, air separation unit is driven, and oxygen and the air discharged by air separation unit mix the oxygen-enriched air formed and send into underground gasification furnace as gasifying agent；Adjusting the total load of underground gasification furnace to after assumed load, coal gas pretreatment unit and low temperature washing device for methanol are driven, and the raw gas discharged by underground gasification furnace sends into low temperature washing device for methanol after coal gas pretreatment unit purifies；Circle synthesis is driven, and the raw gas after low temperature washing device for methanol purifies is sent into circle synthesis；Adjust underground gasification furnace oepration at full load.The starting method of the underground gasification furnace of the present invention and ground corollary system is efficiently and low consumption.

Description

Underground gasification furnace and the starting method of ground corollary system
Technical field
The present invention relates to underground coal gasification(UCG) field, particularly relate to a kind of underground gasification furnace supporting with ground The starting method of system.
Background technology
Utilize coal underground gasification technology can produce air gas, water-gas, semiwater gas and synthesis Gas etc., can apply to IGCC(integrated gasification combined cycle for power generation system) generating, industry/people With combustion gas etc., further coal underground gasifying furnace can mate ground chemical plant installations and synthesize for chemical industry, Produce the chemical products such as methyl alcohol, methane.
Underground gasification furnace produces chemical industry synthesis gas, generally uses oxygen-enriched, pure oxygen as gasifying agent.For For quantity-produced chemical system, underground gasification furnace start-up, need to ensure continuous print gasifying agent Supply.But the feature of underground gasification furnace is that the demand of initial stage gasifying agent is relatively small, and ground is empty Separating device and boiler typically require to be possessed certain load and could normally drive, too low will be unable to set up steady Fixed operation, the most too small oxygen demand cannot meet air separation unit and minimum the opening of boiler driving Car burden requirement.It addition, simultaneously for using carbon dioxide oxygen-enriched (being made up of carbon dioxide and oxygen) As the production technology of gasifying agent, carbon dioxide is generally from (coal gas one in the coal gas in purification process As pass sequentially through coal gas pretreatment unit and low temperature washing device for methanol and purify), and only coal gas amount reaches After certain scale, the driving requirement of coal gas pretreatment unit and low temperature washing device for methanol could be met, from And utilize the carbon dioxide removed by low temperature washing device for methanol to consist of underground gasification furnace and carbon dioxide is provided Oxygen-enriched.In addition it should be pointed out that, after underground gasification furnace normally produces, it is generally not capable of as ground gas Change stove the same, carry out significantly load adjustment, particularly load and can not be adjusted to from higher value less Value, because this can cause gasification unstable, the synthesis gas of output is difficult to meet technological requirement.
Visible, for quantity-produced chemical system, it is necessary to combine underground gasification furnace and join with ground The feature of cover system, reasonably plans the sequencing of the most each device driving and the tune of each device load Whole.Because this is not only related to the how matching problem with ground corollary apparatus, and involves how to Optimize ground whole process system goods and materials, personnel, the problem of fund.Therefore, how underground gas is carried out Change stove to drive with the linkage of matingly plane system, put into operation, be that solution is needed in underground gasification technology scale application badly Technical problem certainly.
Summary of the invention
For problem present in correlation technique, it is an object of the invention to provide a kind of efficient, low The underground gasification furnace consumed and the starting method of ground corollary system.
For achieving the above object, the present invention provides the driving of a kind of underground gasification furnace and ground corollary system Method, including following step successively: (s1) injects gasifying agent coal seam of igniting to underground gasification furnace； (s2) when the oxygen consumption of underground gasification furnace and the life corresponding to the minimum driving load of air separation unit When the amount of the oxygen of output is consistent, air separation unit drive, and by air separation unit discharge oxygen and air The oxygen-enriched air of mixing composition sends into underground gasification furnace as gasifying agent；(s3) underground gasification furnace is adjusted Total load to after assumed load, coal gas pretreatment unit and low temperature washing device for methanol are driven, and by ground The raw gas that gasified fire grate goes out sends into low temperature washing device for methanol after coal gas pretreatment unit purifies； (s4) circle synthesis is driven, and the raw gas after low temperature washing device for methanol purifies is sent into circle synthesis；(s5) Enter oepration at full load by adjusting air separation unit, to adjust underground gasification furnace oepration at full load, and adjust Whole coal gas pretreatment unit, low temperature washing device for methanol and circle synthesis carry out oepration at full load.
According to the present invention, low temperature washing device for methanol the carbon dioxide removed and air separation unit are generated Oxygen mix composition carbon dioxide is oxygen-enriched；Underground gasification furnace is sent into as gasifying agent using oxygen-enriched for carbon dioxide.
According to the present invention, the volumetric concentration of the oxygen-enriched middle oxygen of carbon dioxide is 55% 80%.
According to the present invention, the minimum driving load of air separation unit is 30%.
According to the present invention, in step (s2), maintain the load of air separation unit 30% 70% In the range of.
According to the present invention, in step (s3): assumed load is in the range of 30% 50%.
According to the present invention, by adjusting the load of air separation unit in the range of 30% 50% and adjust Inject the amount of the gasifying agent of underground gasification furnace, the total load of underground gasification furnace is adjusted to assumed load.
According to the present invention, after step (s3) and before execution step (s4), by improving The load of air separation unit and adjustment underground gasification furnace inject the amount of gasifying agent, maintain the total of underground gasification furnace Load is in the range of 50% 70%.
According to the present invention, when air separation unit carries out oepration at full load, its load 70% 100% model In enclosing；When underground gasification furnace carries out oepration at full load, its total load is in the range of 70% 100%； When coal gas pretreatment unit, low temperature washing device for methanol and circle synthesis carry out oepration at full load, its load divides Not in the range of 70% 100%.
According to the present invention, before coal gas pretreatment unit is driven, by part or all of by underground The raw gas that gasification furnace is discharged sends into torch burning.
According to the present invention, the air compressor in air separation unit is steam turbine formula compressor；And/or coal Raw gas compressor in gas pretreatment unit is steam turbine formula compressor；And/or during low-temp methanol is washed Carbon-dioxide gas compressor be steam turbine formula compressor.
According to the present invention, utilize the part or all of steam drive steam turbine formula pressure that boiler produces Contracting machine.
According to the present invention, low temperature washing device for methanol the carbon dioxide removed, air separation unit are generated Oxygen and the steam of part produced by boiler send into underground gasification furnace as gasifying agent.
According to the present invention, before coal gas pretreatment unit is driven, by part or all of by underground The raw gas that gasification furnace is discharged sends into boiler as mixing fuel burning.
Compared to prior art, the invention have the benefit that
The underground gasification furnace of the present invention and the starting method of ground corollary system, gradually by ground breed system Each device in system is driven, and each device in underground gasification furnace and ground corollary system in the process Load gradually adjust, it is possible to reduce each device and drive the investment at initial stage, labor and raw material Consume, thus reduce the cost of underground gasification furnace operation maintenance and improve underground gasification furnace and ground Face corollary system coordinates efficiency and the benefit carrying out Chemical Manufacture.Specifically, according to underground gasification furnace Air separation unit is driven by oxygen demand, and the total load adjusting underground gasification furnace meets coal gas after assumed load Pretreatment unit and low temperature washing device for methanol are driven, and are driven by circle synthesis afterwards thick with utilize after purifying The gases such as Gas Production such as methyl alcohol, after above-mentioned each device is driven, by underground gasification furnace and upper State each device to adjust to oepration at full load, to improve production efficiency.
The oxygen mix that the carbon dioxide removed by low temperature washing device for methanol and air separation unit generate is formed Carbon dioxide is oxygen-enriched and sends into underground gasification furnace as gasifying agent, is effectively carried out by carbon dioxide Reclaim and utilize, decreasing system carbon emission amount, improve the environmental benefit of production process.It addition, Before coal gas pretreatment unit is driven, by the part or all of rough coal discharged by underground gasification furnace Gas mixes burning dyestuff as boiler, can put forward high-octane utilization ratio, reduces environmental pollution and production Cost.
Accompanying drawing explanation
Fig. 1 is first of the underground gasification furnace applying the present invention starting method with ground corollary system The process chart of embodiment；
Fig. 2 is to terminate the process chart after performing step (s2) in the starting method shown in Fig. 1；
Fig. 3 is to terminate the process chart after performing step (s3) in the starting method shown in Fig. 1；
Fig. 4 is second of the underground gasification furnace applying the present invention starting method with ground corollary system The process chart of embodiment；
Fig. 5 is the 3rd of the underground gasification furnace applying the present invention starting method with ground corollary system The schematic diagram of the underground gasification furnace of embodiment；
Fig. 6 is the 4th of the underground gasification furnace applying the present invention starting method with ground corollary system The schematic diagram of the underground gasification furnace of embodiment；
Fig. 7 is the 5th of the underground gasification furnace applying the present invention starting method with ground corollary system The schematic diagram of the underground gasification furnace of embodiment；
Fig. 8 is the 6th of the underground gasification furnace applying the present invention starting method with ground corollary system The process chart of embodiment；
Fig. 9 is to terminate the process chart after performing step (s2) in the starting method shown in Fig. 8；
Figure 10 is to terminate the process chart after performing step (s3) in the starting method shown in Fig. 8.
Detailed description of the invention
First, each device used in the following example is sketched.
Underground gasification furnace: the underground gasification furnace that the present invention uses is for having at least one for injecting gasification The inlet channel of agent, at least one outlet passageway discharging raw gas and connection inlet channel and give vent to anger The coal underground gasifying furnace of the gasification tunnel of passage.Wherein, raw gas is that subterranean coal enters with gasifying agent Row burning, gasification and pyrolytic reaction generate, main component be carbon monoxide, carbon dioxide, methane, Hydrogen, nitrogen and hydrogen sulfide etc., simultaneously possibly together with compositions such as dust, tar, water vapour, phenol ammonia. It addition, the yield that the total load of underground gasification furnace is the raw gas that underground gasification furnace is discharged and this underground gas Changing the percentage of the design production capacity of stove, the yield of the raw gas that underground gasification furnace is discharged is with output per hour Raw gas volume calculate, i.e. the unit of yield is Nm3/h.If underground gasification furnace only has one Outlet passageway, then the total load of underground gasification furnace is the yield of the thus raw gas that outlet passageway is discharged. If underground gasification furnace has multiple outlet passageway, the then product of the raw gas for being discharged by all outlet passageways Amount and.Design production capacity i.e. designs raw gas yield, for tying according to hydrogeologic condition and underground gasification furnace Structure etc. can calculate, this underground gasification furnace rough coal that the unit interval can produce in gasification The volume of gas.
Air separation unit: air pressurizes through the air compressor of air separation unit, then partial air or all empty Gas carries out cooling down, purifying, and enters space division rectifying column afterwards and separates, finally gives oxygen, nitrogen. When needs air as gasifying agent when, it is only necessary to by air pressurized, it is not necessary to carry out cooling down, only Change and separate；When needs oxygen-enriched air (air and oxygen) as gasifying agent when, can be by portion Divide air to carry out isolated oxygen, then mix with another part air, obtain oxygen-enriched air. In the present invention, air separation unit is driven, and for the air compressor in air separation unit, compressed air is delivered to essence Evaporate and tower is isolated the production process of oxygen start.Wherein, air separation unit used in the present invention is this Air separation unit known to skilled person, utilize this air separation unit using air is isolated oxygen as A part for gasifying agent is for underground gasification furnace, when needing air in gasifying agent, utilizes this space division Air compressor in device produces compressed air and sends into underground gasification furnace.The load of air separation unit refers to The production capacity of air separation unit, in the present embodiment, the load of air separation unit is the unit time to produce oxygen (unit is Nm to the volume of gas3/ h) with the percentage of the production capacity of this air separation unit, wherein, should The production capacity of air separation unit be its when dispatching from the factory, the condition of work used during according to design, the unit interval (unit is Nm to the interior volume that can produce oxygen3/ h).Certainly the unit of above-mentioned two numerical value is also Can be Nm3/min.Coal gas pretreatment unit: the coal gas pretreatment unit used in the present invention is ability Coal gas pretreatment unit known to field technique personnel, alternatively, it includes raw gas washing and compression work Sequence, gas liquor separation circuit, phenol recovery process, be mainly used in dedusting, tar removing, washing part miscellaneous Matter gas (such as phenolic component).Specifically, underground gasification furnace discharge containing dirt, tar, phenol ammonia Initially enter scrubbing tower Deng the raw gas of impurity composition to wash with fresh water and reuse waste water counter current contacting Washing, cool down, the tar water after flowing out cooling at the bottom of tower delivers to gas liquor separation circuit, and tower top is washed After raw gas deliver to the tar of active carbon filter capture of trace, the fully raw gas after removing tar Fed downstream purifier after raw gas compressor boost is delivered to after gas-liquid separator separatory.Wherein, The load of coal gas pretreatment unit is that (unit is Nm for the volume of unit time-triggered protocol raw gas3/ h) with This coal gas pretreatment unit processes the percentage of the designed capacity of raw gas, and designed capacity is according to design The condition of work of Shi Caiyong, the volume of manageable raw gas in the coal gas pretreatment unit unit interval. The unit of the designed capacity of coal gas pretreatment unit is Nm3/h.Such as, designed capacity is 120000Nm3/ h(butt), then when the unit interval process raw gas volume be 100000Nm3/ h(does Base) time, the load of coal gas pretreatment unit is 83%.The unit of above-mentioned two numerical value is alternatively Nm3/min。
Low temperature washing device for methanol: the low temperature washing device for methanol used in the present invention is those skilled in the art Known low temperature washing device for methanol, it has removing sour gas (such as hydrogen sulfide, carbon dioxide) Effect, it includes Ammonic washing tower, cooler, scrubbing tower alternatively.Specifically, pre-process through coal gas Raw gas after device preliminary purification first washs in Ammonic washing tower so that it is in ammonia fully remove, wash ammonia After raw gas cooled device heat exchange, cooling after, isolate moisture.It is laggard that raw gas isolates moisture Entering scrubbing tower hypomere, scrubbing tower includes desulfurization section and decarbonization section.At desulfurization section, above-mentioned isolate moisture After raw gas wash through methyl alcohol, remove the component such as hydrogen sulfide and partial CO 2, enter de-afterwards Carbon section.Enter the raw gas the most not sulfur-bearing of decarbonization section, at tower top dioxy in methyl alcohol washing raw gas Changing carbon component to remove to abundant, the raw gas after purification is drawn by tower top, is sent to circle synthesis.Wherein, The load of low temperature washing device for methanol refers to locate the raw gas after reason coal gas pretreatment unit purifies per hour Volume (unit is Nm3/ h) with the percentage of the designed capacity of this low temperature washing device for methanol, this is low The condition of work (abbreviation operating mode) that the designed capacity of temperature washing device for methanol uses when referring to according to design, Unit interval can process the volume of raw gas, and unit is Nm3/h.The unit of above-mentioned two numerical value is also Can be Nm3/min。
Circle synthesis: the circle synthesis used in the present invention is to well known to a person skilled in the art circle synthesis, In below embodiment, it produces methane, methyl alcohol, dimethyl ether, alkene alternatively.Such as, by above-mentioned Carbon monoxide in the raw gas obtained after being purified by low temperature washing device for methanol and a small amount of carbon dioxide with Hydrogen, under methanation catalyst effect, is generated by methanation reaction, and the equation of reaction is: CO +3H2=CH4+H2O；CO2+4H2=CH4+2H2O.If production methyl alcohol, key reaction side Formula is: CO+2H2=CH3OH；CO2+3H2=CH3OH+H2O.Wherein, circle synthesis Load refers to that (unit is Nm for the volume of productive target product per hour3/ h) and the design energy of circle synthesis The percentage of power, the condition of work that the designed capacity of circle synthesis uses when referring to according to design, produce mesh The volume of mark product, unit is Nm3/h.Such as, giving birth to methanogenic designed capacity is 40000Nm3/h。 Certainly, the unit of above-mentioned numerical value is alternatively Nm3/ min or ton/d.
Torch: the torch that the present invention uses is to well known to a person skilled in the art torch, and it is chemical plant Important safety and environmental protection facility, mainly for the treatment of process units shutting down, improper production and tight The fuel gas effectively reclaimed is cannot be carried out under anxious state.
Boiler: the boiler that the present invention uses is to well known to a person skilled in the art boiler, it is a kind of energy Amount conversion equipment, inputs fuel to boiler, changes through boiler, and outwards output has certain heat energy Steam.The load of boiler is that (unit is Nm for the volume of output steam per hour3/ h) with the setting of boiler The percentage of meter ability.Wherein, the condition of work that the designed capacity of boiler uses when referring to according to design, Producing the volume of steam in the boiler unit interval, unit is Nm3/h.Above-mentioned numerical value unit is alternatively Nm3/min、ton/h、ton/d。
Below in conjunction with the accompanying drawings the specific embodiment of the invention is described.
See Fig. 1, a reality of the starting method of the underground gasification furnace of the present invention and ground corollary system Execute example, including following step successively.
Perform step (s1): inject gasifying agent coal seam of igniting to underground gasification furnace.Wherein, underground Gasification furnace is for before performing step (s1), the ground set up in the gasification zone of predetermined exploitation Gasified stove.The arrangement of underground gasification hotplate body depends on coal seam in the gasification zone of predetermined exploitation Trend, tendency, the concrete geology such as cranny development situation, water yield and hydrologic regime.At underground gasification Carried out drilling well by ground to coal seam in stove layout area and set up inlet channel, outlet passageway and gasification tunnel Deng.According to coal seam framework, selected ignition zone, underground gasification furnace is lighted a fire, with coal seam of igniting. During underground gasification furnace ignites, the gasifying agent of injection is such as air or oxygen, and in coal seam After igniting, the burning in coal seam can be regulated and controled by the oxygen content in regulation gasifying agent.Alternatively, exist When lighting coal seam, use air as gasifying agent.After igniting in coal seam, gradually become air and oxygen The oxygen-enriched air of composition is as gasifying agent.In the present embodiment, above-mentioned air and oxygen are by this area skill Equipment known to art personnel provides.
Perform step (s2): when oxygen consumption and the minimum driving of air separation unit of underground gasification furnace When the amount of the oxygen produced corresponding to load is consistent, air separation unit is driven.Specifically, " space division The driving load of device " it is equal to " amount of the oxygen that air separation unit is produced " divided by " air separation unit is raw Produce the ability of oxygen " percentage that obtains." space division dress it is equal to when " the driving load of air separation unit " The minimum driving load (such as 30%) put " time, correspondingly there will be corresponding " air separation unit The amount of the oxygen produced ".Further, for air separation unit, the oxygen that air separation unit is produced Amount be the unit time produce oxygen volume, when it reaches certain numerical value, could be to air separation unit Set up stable operation, and due to air separation unit production capacity (producing the ability of oxygen) it is known that So the volume that the air separation unit unit interval produces oxygen is corresponding with the load of air separation unit.Additionally, send The gasifying agent entering underground gasification furnace configures by a certain percentage, i.e. the volume hundred of the oxygen in gasifying agent The percent by volume of proportion by subtraction and air is it is known that work as the gasifying agent total flow (gasifying agent consumed per hour Volume, unit is Nm3/ h) determine after, just can calculate and determine oxygen consumption, specific air consumption, Wherein, oxygen consumption is that (unit is Nm for the volume of the oxygen consumed per hour3/ h), air disappears Consumption is that (unit is Nm for the volume of the air consumed per hour3/ h).It is understood that underground gasification furnace Oxygen consumption be the oxygen consuming how many standard cubic meters per hour, and air separation unit unit interval Produce the volume of oxygen be per hour can the oxygen of output how many standard cubic meters, when air separation unit is every The when that the carrier of oxygen accumulated amount of hour output meeting the carrier of oxygen accumulated amount of underground gasification furnace needs per hour, Air separation unit is driven, thereby, it is possible to ensure the stable operation of air separation unit.
Additionally, in the present embodiment, after air separation unit is driven, the space division in air separation unit is compressed Compressed air and the oxygen-enriched air being made up of the isolated oxygen of rectifying column that machine produces are noted as gasifying agent Entering in underground gasification furnace, it is appreciated that now, the gasifying agent that underground gasification furnace is passed through is by air separation unit There is provided, in other words, after air separation unit is driven, the air of air separation unit output and the richness of oxygen composition Oxygen air instead of the gasifying agent injecting underground gasification furnace before air separation unit is driven.Alternatively, first by sky Compressed air and the isolated oxygen of rectifying column that partial compression machine produces send into gas mixing device, by certain Form gasifying agent after ratio mixing, and gasifying agent is injected into entering of underground gasification furnace by regulating flow quantity ground In gas passage.Certainly, according to the operation conditions of underground gasification furnace, in adjustable above-mentioned oxygen-enriched air Oxygen and the ratio of air.In embodiment alternatively, it is possible to according to the operation conditions of underground gasification furnace Only it is passed through air or oxygen.
In the present embodiment, the air compressor in air separation unit is steam turbine formula compressor, passes through Boiler, provides steam for this steam turbine formula compressor.Thus, before air separation unit is driven, steam Boiler is first driven, and the steam turbine for air compressor provides steam.
Further, after in step (s2), air separation unit is driven, coal gas pretreatment dress in step (s3) Putting before driving with low temperature washing device for methanol, the raw gas that can be produced by underground gasification furnace is part or all of Torch of delivering to carry out burning and exhausting or part or all of feeding boiler as mixing fuel burning.Due to Now underground gasification furnace not oepration at full load, and underground gasification furnace is in initial operating stage, its raw gas Active principle content relatively low, be thus introduced into torch burning can be effectively prevented its discharge after stain Air.And raw gas is mixed burning dyestuff as boiler, high-octane utilization ratio can be put forward, reduce Environmental pollution and production cost.
It addition, after air separation unit is driven, the load of air separation unit is maintained the model of 30% 70% In enclosing, in the present embodiment, the load of air separation unit is maintained in the range of 30% 50%.Its In, can be by adjusting the amount of gasifying agent of underground gasification furnace, or the sub-gas put into operation in underground gasification furnace Change the number of units of stove.Certainly, it is possible to controlled the load of air separation unit by additive method, such as, adjust The load of boiler.
To sum up, with reference to Fig. 2, after execution of step (s2), the starting method of the present invention define as Technological process shown in Fig. 2, i.e. boiler provide steam, output after air separation unit driving for air separation unit Oxygen and air composition oxygen-enriched air be transported to underground gasification furnace as gasifying agent by pipe network, and A part for the raw gas produced by underground gasification furnace is delivered to torch and is carried out burning and exhausting, and another part send To boiler as mixing fuel burning.
Perform step (s3): with gasification furnace water yield, coal seam thickness, raw gas component and calorific value, Gasification efficiency is foundation, adjusts the injection flow of gasifying agent, thus improves the total load of underground gasification furnace, Until it is equal to assumed load.Specifically, during underground coal gasification(UCG), gasification furnace water yield, Coal seam thickness has certain functional relation with the flow that injects of gasifying agent, i.e. certain coal seam thickness With under water yield, there is an optimal gasifying agent and inject flow.In actual gasification, Ke Yitong Cross the component of raw gas and calorific value that underground gasification furnace outlet passageway discharges and gasification efficiency judges gasification The injection flow of agent is the most suitable.Thus, by raw gas component and calorific value and gasification efficiency, adjust The injection flow of solar term agent, promotes the burning in coal seam, thus improves the total load of underground gasification furnace.
In the present embodiment, above-mentioned assumed load is 50%.Specifically, by adjusting air separation unit Load injects the amount of the gasifying agent of underground gasification furnace to 50% and adjustment, by the total load of underground gasification furnace It is adjusted to assumed load.Thus, by the load of adjustment air separation unit to 50%, space division dress can be controlled Put the oxygen demand during the amount of oxygen of offer meets the total load improving underground gasification furnace, by adjusting The amount of the gasifying agent of whole injection underground gasification furnace, the controllably combustion position in gasified stove, by This is gradually increased the burning in coal seam, improves the yield of raw gas.
After the total load of underground gasification furnace reaches above-mentioned assumed load, coal gas pretreatment unit and low temperature Washing device for methanol is driven, and the raw gas that underground gasification furnace is discharged is passed through the purification of coal gas pretreatment unit, I.e. dedusting, tar removing, washing partial impurities gas such as phenolic component, and will purify through said process After raw gas go moisture and pressurization after deliver to low temperature washing device for methanol and again purify, remove sour gas Hydrogen sulfide, carbon dioxide.The carbon dioxide removed by low temperature washing device for methanol is generated with air separation unit Oxygen mix composition carbon dioxide oxygen-enriched, and using oxygen-enriched for this carbon dioxide as gasifying agent send into underground Gasification furnace.It is understood that above-mentioned carbon dioxide is oxygen-enriched instead of coal gas pretreatment unit and low-temp methanol is washed Device drive before the oxygen-enriched air that forms of the air that provided by air separation unit and oxygen as gasifying agent, In other words, being passed through the gasifying agent of underground gasification furnace, to be carbon dioxide oxygen-enriched.Alternatively, carbon dioxide The volumetric concentration of oxygen-enriched middle oxygen is 55% 80%.It is certainly not limited to the present embodiment, it will be appreciated that, Whether use carbon dioxide oxygen-enriched and when use carbon dioxide oxygen-enriched, being the reality with underground gasification furnace Ruuning situation is foundation.When without using carbon dioxide oxygen-enriched, oxygen-enriched air conduct can be continuing with Gasifying agent.
In the present embodiment, coal gas pretreatment unit use steam turbine formula compressor as raw gas Compressor, pressurizes for raw gas.Further, above-mentioned boiler is used to provide for this steam turbine formula compressor Steam.And low temperature washing device for methanol includes carbon-dioxide gas compressor, by compressed for the carbon dioxide of removing Rear feeding underground gasification furnace.Preferably, this carbon-dioxide gas compressor is steam turbine formula compressor, and And, use above-mentioned boiler to provide steam for this steam turbine formula compressor.Thus, pre-process at coal gas Before device and low temperature washing device for methanol are driven, also include the step adjusting the load of boiler, think Raw gas compressor and carbon-dioxide gas compressor provide steam.
To sum up, with reference to Fig. 3, after execution of step (s3), the starting method of the present invention define as Technological process shown in Fig. 3, air compressor, coal gas during i.e. boiler is respectively air separation unit are located in advance Raw gas compressor in reason device and the carbon-dioxide gas compressor in low temperature washing device for methanol provide steam To drive turbine, the oxygen of the rectifying column output in air separation unit and the two of low temperature washing device for methanol removing Carbon dioxide is oxygen-enriched delivers to underground gasification furnace as gasifying agent, by underground gasification furnace output for carbonoxide composition Raw gas discharge after coal gas pretreatment unit and low temperature washing device for methanol purify, the row after this purification The raw gas gone out mainly contains hydrogen and carbon monoxide.
Alternatively, after step (s3) and before execution step (s4), by improving space division The load of device and adjustment underground gasification furnace inject the amount of gasifying agent, maintain the total load of underground gasification furnace In the range of 50% 70%.That is, amount and the adjustment ground of oxygen are provided by improving air separation unit The flow of gasified stove injection gasifying agent, the burning in the coal seam in promotion underground gasification furnace, the most gradually Improve the raw gas yield of underground gasification furnace, until load reaches in the range of 50% 70%, and tie up Hold it less than 70%.
Perform step (s4): when the total load of underground gasification furnace runs in the range of 50% 70% After Wen Ding, circle synthesis is driven, and the raw gas after low temperature washing device for methanol purifies is sent into circle synthesis. Wherein, if in 24 hours, the volume change of gas composition is less than or equal to 0.5% and coal gas produces The rate of change of amount is less than 15%, then it represents that underground gasification furnace is stable.
To sum up, with continued reference to Fig. 1, after execution of step (s4), boiler is respectively in air separation unit Raw gas compressor in air compressor, coal gas pretreatment unit and two in low temperature washing device for methanol Carbonoxide compressor provide steam to drive turbine, the oxygen of the rectifying column output in air separation unit and low The carbon dioxide composition gasifying agent of temperature washing device for methanol removing delivers to underground gasification furnace, by underground gasification furnace The raw gas of output is expelled to circle synthesis after coal gas pretreatment unit and low temperature washing device for methanol purify, The raw gas of the discharge after this purification mainly contains hydrogen and carbon monoxide.In circle synthesis, can be complete Become methane, methyl alcohol, dimethyl ether or the production of alkene.
Step (s5): enter oepration at full load, to adjust underground gasification furnace by adjusting air separation unit Oepration at full load, and adjust coal gas pretreatment unit, low temperature washing device for methanol and circle synthesis and completely bear Lotus runs.Wherein, when air separation unit carries out oepration at full load, its load 70% 100% scope In；When underground gasification furnace carries out oepration at full load, its total load is in the range of 70% 100%；Coal When gas pretreatment unit carries out oepration at full load, its load is in the range of 70% 100%；Low temperature first When alcohol cleaning device carries out oepration at full load, its load is in the range of 70% 100%；Circle synthesis is carried out During oepration at full load, its load is in the range of 70% 100%.
To sum up, in the present embodiment, step (s1) during having performed to step (s3), The total load of underground gasification furnace is increase gradually to 50%, and after step (s4) has performed, by ground The total load of gasified stove is increase gradually in the range of 50%-70%, and keeps stable operation.? Perform, in step (s5), to be improved to 70%-100% by the total load of underground gasification furnace.? During the total load of underground gasification furnace gradually steps up, progressively by pre-to boiler, air separation unit, coal gas Processing means, low temperature washing device for methanol, circle synthesis are driven, and step up the negative of each device accordingly Lotus.
Thus, by above-mentioned starting method, gradually each device in the corollary system of ground is driven, and The load of each device in underground gasification furnace and ground corollary system gradually adjusts, thus in the process Each device the driving investment at initial stage, the consumption of labor and raw material can be reduced, thus reduce underground gas Change the cost of stove operation maintenance and improve underground gasification furnace and ground corollary system cooperationization The efficiency of work production and benefit.Specifically, according to the oxygen demand of underground gasification furnace, air separation unit is driven, Coal gas pretreatment unit and low-temp methanol are washed after meeting assumed load by the total load of adjustment underground gasification furnace Device is driven, and drives circle synthesis to utilize the raw gas after purifying to produce the gases such as such as methyl alcohol afterwards, After above-mentioned each device is driven, underground gasification furnace and above-mentioned each device are adjusted to oepration at full load, To improve production efficiency.
Additionally, the oxygen that the carbon dioxide removed by low temperature washing device for methanol and air separation unit generate is mixed Be combined into carbon dioxide oxygen-enriched and as gasifying agent send into underground gasification furnace, effectively by titanium dioxide Carbon is reclaimed and has been utilized, and decreases system carbon emission amount, improves the environmental benefit of process.
With reference to Fig. 4, second embodiment of the present invention, with the something in common of above-mentioned first embodiment Repeat no more.In the present embodiment, in order to obtain preferably coal gas active principle, melt according to coal seam ash The difference of point, water content, gasification furnace furnace temperature etc., suitably can make up water in gasifying agent steam.When needing When regulating the active principle in the raw gas of output by adding steam, dress will be washed by low-temp methanol Put the carbon dioxide of removing, oxygen that air separation unit generates and the steam of part that produced by boiler Underground gasification furnace is sent into as gasifying agent.It is understood that now by oxygen, carbon dioxide and steam group The gasifying agent that the gasifying agent become uses before replacing, is i.e. made up of oxygen, carbon dioxide and steam Gasifying agent replaces carbon dioxide oxygen-enriched.In other words, now, the gasifying agent being injected in underground gasification furnace All gasifying agents being made up of oxygen, carbon dioxide and steam.It is understood, of course, that, gasifying agent Whether comprise steam and when use the gasifying agent with steam, with the reality of underground gasification furnace Ruuning situation is foundation.
With reference to Fig. 5, illustrate the underground gasification furnace of the application present invention and the driving side of ground corollary system The underground gasification furnace of the 3rd embodiment of method.
Before performing step (s1), set up underground gasification furnace.Specifically, in the present embodiment, In the mining area of predetermined gasification, set up n sub-gasification furnace, n depend on the reserves of coal in mining area, Gasified stove design size and synthesis gas production scale etc..As shown in Figure 4, every sub-gasification furnace is by 1 Individual directional drilling and 1 vertical drilling are constituted, and are made up of coiled tubing and corollary apparatus in directional drilling And as inlet channel a, upright opening passes through as outlet passageway b, inlet channel a and outlet passageway b Gasification tunnel c connects.Thus complete the foundation of a sub-gasification furnace, in the present embodiment, n sub-gas Change stove and constitute underground gasification furnace.And in the diagram, 1, second son gasification of first sub-gasification furnace Stove 2 is until leaving isolated coal pillar between the n-th sub-gasification furnace n.
Perform step (s1): transferred igniter by n the respective outlet passageway of sub-gasification furnace, adopt Carry out selecting injection gasifying agent of fighting with silane and methane, coal seam of igniting, and utilize thermocouple to detect temperature, Confirm to ignite in coal seam.Control injection point backing (CRIP) gasifying process is used to produce, this technique By coiled tubing injection oxygen (i.e. gasifying agent) to maintain burning and the gasification in coal seam, and by even Continuous oil pipe controlledly carries out retreating (by outlet passageway to the direction of inlet channel), controls coal seam Burning and the position of gasification, the distance once retreated depends on the size of cavity-growth and gasifying agent Gas injection ability.In the present embodiment, above-mentioned oxygen is by well known to a person skilled in the art that equipment provides.
Perform step (s2): when oxygen consumption and the minimum driving of air separation unit of underground gasification furnace When the amount of the oxygen produced corresponding to load is consistent, time, boiler is driven and is air separation unit hollow The turbine of partial compression machine provides steam, and air separation unit is driven afterwards., minimum driving Load is 30%.Air compressor starts, by the air after air compressor pressurizes with by rectifying column Isolated oxygen composition oxygen-enriched air, this oxygen-enriched air is transported to each son as gasifying agent by pipe network Gasification furnace, then it is transported to flame range through coiled tubing, and by outlet passageway, each sub-gasification furnace is produced Raw gas is delivered to torch and is carried out burning and exhausting.Wherein, after air separation unit is driven, by air separation unit Air compressor pressurization air and the oxygen-enriched air being made up of the isolated oxygen of rectifying column instead of Above-mentioned oxygen is as gasifying agent, i.e. now injecting the gasifying agent in each gasification furnace is only by above-mentioned space division The air of compressor pressurization.Preferably, in oxygen-enriched air, the volumetric concentration of oxygen is 35%.
Perform step (s3): adjust boiler load and the load of air compressor, so that air separation unit Load adjustment is in the range of 30% 50%.And according to gasification furnace water yield, coal seam thickness, coal gas Calorific value, gasification efficiency etc., adjust the amount of the gasifying agent that underground gasification furnace injects, make underground gasification furnace Total load progressivelyes reach in the range of 30% 50%.After commissioning test is stable, i.e. in 24 hours, The volume change of gas composition less than or equal to 0.5% and gas yield rate of change less than 15% feelings Under condition, adjust Boiler Steam load, provide steam for the raw gas compressor in coal gas pretreatment unit To drive turbine, coal gas pretreatment unit is driven.Coal gas is washed by coal gas pretreatment unit, de- Except impurity such as the tar in coal gas, dirt, phenol ammonia, afterwards raw gas is isolated after moisture by raw gas Compressor carries out supercharging to raw gas.After coal gas pretreatment unit is driven, low temperature washing device for methanol is driven, The raw gas sent into after coal gas pretreatment unit purifies removes acid therein through low temperature washing device for methanol Property gas cure hydrogen, carbon dioxide etc., wherein, adjust Boiler Steam load, start pressurized carbon dioxide Contracting machine, is delivered to underground gasification furnace by after carbon dioxide pressurization, with the oxygen mix of air separation unit conveying It is made into the carbon dioxide that carrier of oxygen volume concentrations is 55%-80% oxygen-enriched, replaces oxygen-enriched air as gasifying agent. In other words, in the present embodiment, for adjusting the burning in coal seam in underground gasification furnace, the thick of output is improved The content of the active principle in coal gas, using carbon dioxide and oxygen as gasifying agent, conduct before replacement The air of gasifying agent, i.e. the gasifying agent being passed through underground gasification furnace is carbon dioxide and oxygen.
After boiler, air separation unit, coal gas pretreatment unit, low temperature washing device for methanol are driven, progressively carry The load of high air separation unit, increases oxygen quantity delivered, and adjusts the injection gas of each sub-gasification furnace accordingly The flow (that is, air inflow) of agent, thus improve the load of all or part of sub-gasification furnace, make The total load of underground gasification furnace maintains in the range of 50%～70%.Specifically, in practical operation Cheng Zhong, each sub-gasification furnace alternately through independent air intake control system, such as, adjusts air inlet boring valve The aperture of door, changes the air inflow of each sub-gasification furnace, thus controls the production load of each sub-gasification furnace, And then control the total load of underground gasification furnace.Perform step (s4): after commissioning test is stable, i.e. exist In 24 hours, the volume change of gas composition is little less than or equal to the rate of change of 0.5% and gas yield In the case of 15%, circle synthesis is driven.The raw gas produced by underground gasification furnace, locates in advance through coal gas Reason device and low temperature washing device for methanol send into circle synthesis after purifying.So far, whole underground gasification furnace and ground Face corollary system completes to drive and put into operation, and gets through production procedure, i.e. produces the gases such as above-mentioned methyl alcohol.
Perform step (s5): progressively by each sub-gasification furnace, air separation unit, coal gas pretreatment unit, Low temperature washing device for methanol and circle synthesis are adjusted to oepration at full load.Wherein, air separation unit is carried out at full capacity During operation, its load is in the range of 70% 100%；When each sub-gasification furnace carries out oepration at full load, Its load is in the range of 70% 100%；When coal gas pretreatment unit carries out oepration at full load, it is born Lotus is in the range of 70% 100%；When low temperature washing device for methanol carries out oepration at full load, its load exists In the range of 70% 100%；When circle synthesis carries out oepration at full load, its load is 70% 100% In the range of.
With reference to Fig. 6, illustrate the underground gasification furnace of the application present invention and the driving side of ground corollary system The underground gasification furnace of the 4th embodiment of method.
Performing, step (s1) is front, sets up underground gasification furnace.In the present embodiment, at selected gas Changing and set up a underground gasification furnace on coalfield, the size of underground gasification furnace and structure layout thereof depend on coal Charcoal reserves, the daily output of raw gas, the capacity of each boring, the design production period of underground gasification furnace Limit and the hydrology of ocurrence of coal seam, geological conditions.By the yield of raw gas, (unit is Nm3/ h) and every Hour exhaust capacity of individual boring, determines the quantity of every row hole drilling；Design clothes according to underground gasification furnace Must limits, and determines to beat some row hole drillings.If the raw gas yield of a underground gasification furnace does not reaches set Meter yield, then can be produced raw gas by plural underground gasification furnace multiple operation simultaneously.Fig. 6 Illustrate for a underground gasification furnace, be made up of some row hole drillings, boring is upright opening, the most every Row hole drilling 10～12, be specifically dependent upon raw gas production scale and each boring exhaust hourly energy Power.First construct first three row hole drilling, and complete the construction of the supporting pipe network in ground.Set up at above-mentioned upright opening After, boiler is driven, and the turbine for air compressor provides steam.Air compressor starts afterwards, By the air after pressurization by pipe network, being transported to underground gasification furnace, cold conditions pressure break 11 ' and 12 ' is holed, Making to set up between two borings connection, selection 11 ' is as outlet passageway, and 12 ' as inlet channel, and 11 ' Light a fire in boring, light coal seam.After lighting a fire successfully, use reverse firepower through, 11 ' and Form gasification tunnel after reaming between 12 ' borings, carry out pressure break in 13 ' and 12 ' borings simultaneously.Method according to this, Other upright openings on this row the most through, and using this row hole drilling as the outlet passageway of underground gasification furnace.
Afterwards, cold conditions pressure break second row is holed, and by the through method of reverse firepower, sets up and above-mentionedly Gasified stove go out gas drilling hole connection passage, connect with 11 ' such as 21 ', 22 ' with 12 ' hole connect. Thus, setting up the connection of second row boring and first row boring successively, second row boring is led to as air inlet Road, thus each boring in first row with and its corresponding second row in each boring constitute one Sub-gasification furnace.During the foundation of this two row, the air compressor in air separation unit drives to carry for it For the air after through pressurization, and reverse through time provide air as gasifying agent.This process The rectifying column of middle air separation unit does not bring into operation, will air compressor discharge compressed air deliver to The production process isolating oxygen in rectifying column does not start, and thus air separation unit is not driven.Wherein, Cold conditions pressure break is to set up the method for operating of airflow connection relation between two vertical drillings, specifically refers to One vertical drilling press-in pressure-air, owing to coal seam has certain hole and crack, when air pressure After power reaches to a certain degree, air can flow in coal seam, and flows out from another boring, thus Two borings are made to connect in coal seam.
Perform step (s1): in the present embodiment, the through and gasification of underground gasification furnace is entered continuously OK, thus through during flame can continue to light coal seam injecting while air so that it is just entering To gasification.That is, compressed air air compressor discharged as gasifying agent along admission line, via Arm is holed along air inlet, is sent into by gasifying agent in gasification tunnel, proceeds by forward gasification, and, In gasification, gradually oxygen and air are mixed and send in gasification tunnel.The raw gas edge produced Go out gas drilling hole to send in outlet pipe via arm.In the present embodiment, above-mentioned oxygen is by this area skill Equipment known to art personnel provides.
Perform step (s2): when the oxygen consumption of underground gasification furnace is born with the minimum driving of air separation unit When the amount of the oxygen produced corresponding to lotus is consistent, air separation unit is driven.The oxygen produced by air separation unit Gas and air are injected in underground gasification furnace as gasifying agent.Wherein, in order to maintain the company of gasification Continuous property, while gasifying, synchronizes through 3rd row hole drilling, holes in coal seam with second row Set up passage to be interconnected；The boring of follow-up each row then synchronizes to carry out drilling well or Construction in Preparatory Stage. In the present embodiment, minimum driving load is equal to 30%.
Perform step (s3): the load of adjustment boiler load and air compressor be (air compressor Load is the compressed-air actuated volume of output per hour, and unit is Nm3/ h) so that air separation unit load It is adjusted to 30% 50%.And according to gasification furnace water yield, coal seam thickness, calorific value of gas, gasification effect Rates etc., adjust the amount of the gasifying agent injecting underground gasification furnace, make the total load of underground gasification furnace gradually reach To 30% 50%.After commissioning test is stable, i.e. in 24 hours, the volume change of gas composition Less than or equal to 0.5% and the rate of change of gas yield is less than in the case of 15%, adjust the load of boiler, There is provided the air driving wherein turbine for raw gas compressor, coal gas pretreatment unit is driven.Coal gas is pre- Coal gas is washed by processing means, removes the impurity such as the tar in coal gas, dirt, phenol ammonia, and is dividing Separate out supercharging after moisture.After coal gas pretreatment unit is driven, low temperature washing device for methanol is driven, through coal gas The raw gas that pretreatment unit is sent into after purifying removes sour gas therein through low temperature washing device for methanol Hydrogen sulfide, carbon dioxide etc., wherein, adjust Boiler Steam load, start carbon-dioxide gas compressor, It is delivered to underground gasification furnace by after carbon dioxide pressurization, is made into oxygen with the oxygen mix of air separation unit conveying Air volume concentration is that the carbon dioxide of 55%-80% is oxygen-enriched, substitutes oxygen-enriched air as gasifying agent.Boiler, After air separation unit, coal gas pretreatment unit, low temperature washing device for methanol are driven, step up air separation unit Load to 50%, to increase oxygen quantity delivered, and adjust the air inflow (gas of each sub-gasification furnace accordingly The injection flow of agent), thus improve the load of all or part of sub-gasification furnace, make underground gasification The total load of stove maintains 50%～70%.
Perform step (s4): after commissioning test is stable, i.e. in 24 hours, the volume of gas composition Rate of change is less than or equal to 0.5% and the rate of change of gas yield is less than in the case of 15%, and circle synthesis is opened Car.The raw gas that underground gasification furnace is produced, clean through coal gas pretreatment unit and low temperature washing device for methanol Circle synthesis is sent into after change.So far, whole underground gasification furnace and ground corollary system complete to drive and put into operation, Get through production procedure.
Perform step (s5): progressively by each sub-gasification furnace, air separation unit, coal gas pretreatment unit, Low temperature washing device for methanol and circle synthesis are adjusted to oepration at full load.Wherein, air separation unit is carried out at full capacity During operation, its load is 70% 100%；When each sub-gasification furnace carries out oepration at full load, its load exists 70%—100%；When coal gas pretreatment unit carries out oepration at full load, its load is 70% 100%； When low temperature washing device for methanol carries out oepration at full load, its load is 70% 100%；Circle synthesis carries out full During load operation, its load is 70% 100%.
With reference to Fig. 7, illustrate the underground gasification furnace of the application present invention and the driving side of ground corollary system The underground gasification furnace of the 5th embodiment of method.
Before performing step (s1), set up underground gasification furnace.In the present embodiment, underground gasification Stove is a multiple row gasification furnace, and this gasification furnace is made up of multiple directional drillings, general 4～6, orientation Holing arranged in parallel, end is connected by another directional drilling, and the end of this Directional Drilling includes at least one Individual vertical drilling, the quantity of boring depends on design production capacity and the exhaust capacity of boring of underground gasification furnace. First construction the 1st row, the 2nd row directional drilling and vertical drilling；Afterwards, transfer in vertical drilling Igniter, coal seam of igniting.After lighting a fire successfully, first, boiler is driven, and starts air compressor, By air by pipe network, it is transported to underground gasification furnace, with this vertical drilling for outlet passageway b ' ', orientation Boring as inlet channel a ' ', it is through to carry out reverse firepower, and processing Directional Drilling horizontal channel is as gasification furnace Gasification tunnel c ' ', and the raw gas that underground gasification furnace is produced by outlet passageway is delivered to torch fire Burn discharge.After passage has built, using air compressor discharge compressed air as gasifying agent, send Enter underground gasification furnace, proceed by forward and gasify, and in the process, gradually by oxygen and above-mentioned sky Gas mixing sends into underground gasification furnace as gasifying agent, and the coal gas of generation is sent into along going out gas drilling hole via arm In coal gas main pipeline.In order to maintain the continuity of gasification, while gasifying, synchronize to pass through Logical Article 2 Directional Drilling builds；Follow-up each bar directional drilling then synchronizes to carry out drilling well or preparation of construction rank Section.In the present embodiment, above-mentioned oxygen is by well known to a person skilled in the art that equipment provides.
In the present embodiment, step (s2) is identical, no longer with the 3rd embodiment to step (s5) Repeat.
With reference to Fig. 8, illustrate the underground gasification furnace of the application present invention and the driving side of ground corollary system The process chart of the 6th embodiment of method.
Perform step (s1): inject gasifying agent coal seam of igniting to underground gasification furnace.Wherein, underground Gasification furnace is before performing step (s1), the ground set up in the gasification zone of predetermined exploitation Gasified stove.The arrangement of underground gasification hotplate body depends on coal seam in the gasification zone of predetermined exploitation Trend, tendency, the concrete geology such as cranny development situation, water yield and hydrologic regime.At underground gasification Carried out drilling well by ground to coal seam in stove layout area and set up inlet channel, outlet passageway and gasification tunnel Deng.According to coal seam framework, selected ignition zone, underground gasification furnace is lighted a fire, with coal seam of igniting. During underground gasification furnace ignites, the gasifying agent of injection is such as air or oxygen, and in coal seam After igniting, the burning in coal seam can be regulated and controled by the oxygen content in regulation gasifying agent.Alternatively, exist When lighting coal seam, use air as gasifying agent.After igniting in coal seam, gradually become air and oxygen The oxygen-enriched air of composition is as gasifying agent.
Perform step (s2): when oxygen consumption and the minimum driving of air separation unit of underground gasification furnace When the amount of the oxygen produced corresponding to load is consistent, air separation unit is driven, in the present embodiment, The minimum driving load of air separation unit is equal to 30%.
Additionally, after air separation unit is driven, air separation unit is discharged oxygen and the richness of air mixing composition Oxygen air sends into underground gasification furnace as gasifying agent.In the present embodiment, the space division pressure in air separation unit Air after the pressurization that contracting machine produces and the oxygen-enriched air that is made up of the isolated oxygen of rectifying column are as gas Agent is injected in underground gasification furnace, it is appreciated that now, the gasifying agent that underground gasification furnace is passed through is by sky Separating device provides, in other words, after air separation unit is driven, and the air of air separation unit output and oxygen group The oxygen-enriched air become instead of the gasifying agent injecting underground gasification furnace before air separation unit is driven.Alternatively, The compressed air first produced by air compressor and the isolated oxygen of rectifying column send into gas mixing device, Form gasifying agent by a certain percentage after mixing, and gasifying agent is injected into underground gasification by regulating flow quantity ground In the inlet channel of stove.Certainly, according to the operation conditions of underground gasification furnace, adjustable above-mentioned oxygen-enriched sky Oxygen in gas and the ratio of air.In embodiment alternatively, it is possible to according to the fortune of underground gasification furnace Row situation is only passed through air or oxygen.
In the present embodiment, the air compressor in air separation unit is steam turbine formula compressor, passes through Boiler, provides steam for this steam turbine formula compressor.Thus, before air separation unit is driven, steam Boiler is first driven, and the steam turbine for air compressor provides steam.
Further, after in step (s2), air separation unit is driven, coal gas pretreatment dress in step (s3) Putting before driving with low temperature washing device for methanol, the raw gas that can be produced by underground gasification furnace is part or all of Torch of delivering to carry out burning and exhausting or part or all of feeding boiler as mixing fuel burning.
It addition, after air separation unit is driven, the load of air separation unit is maintained the model of 30% 50% In enclosing.Wherein, by adjusting the amount of the gasifying agent of underground gasification furnace, or underground gasification furnace can be thrown The number of units of the sub-gasification furnace of fortune.Certainly, it is possible to controlled the load of air separation unit, example by additive method As, adjust the load of boiler.
To sum up, with reference to Fig. 9, after execution of step (s2), the starting method of the present invention define as Technological process shown in Fig. 9, i.e. boiler provide steam, output after air separation unit driving for air separation unit Oxygen and air composition oxygen-enriched air be transported to underground gasification furnace as gasifying agent by pipe network, and The raw gas that underground gasification furnace produces is delivered to torch carry out burning and exhausting and deliver to boiler and combust as mixing Material.
Perform step (s3): by the steam group by isolated for air separation unit oxygen Yu boiler One-tenth steam is oxygen-enriched to be sent in underground gasification furnace as gasifying agent, and adjusts the load of air separation unit extremely 50%, the total load adjusting underground gasification furnace reaches 50%.It is understood that in the present embodiment, above-mentioned The above-mentioned oxygen-enriched air of the oxygen-enriched replacement of steam is as gasifying agent, in other words, now sends into underground gasification furnace Gasifying agent be only that the steam being made up of steam and oxygen is oxygen-enriched.Thus, underground gasification can be promoted The burning in coal seam in stove, improves the total load of underground gasification furnace.It addition, the steam in gasifying agent can Improve the content of active principle in raw gas, thus improve the production efficiency of the gases such as follow-up such as methane.
Certainly, it is possible in remaining step, above-mentioned oxygen-enriched air is replaced with steam oxygen-enriched as gasifying agent, Replace time and whether be replaced, with the content the need of the active principle improved in raw gas, Or the demand such as being adjusted the need of the temperature of the flame face to underground gasification furnace is foundation.
After the total load of underground gasification furnace reaches above-mentioned assumed load, coal gas pretreatment unit and low temperature Washing device for methanol is driven, and the raw gas that underground gasification furnace is discharged is passed through the purification of coal gas pretreatment unit, I.e. dedusting, tar removing, washing partial impurities gas such as phenolic component, and will purify through said process After raw gas go moisture and pressurization after deliver to low temperature washing device for methanol and again purify, remove sour gas Hydrogen sulfide, carbon dioxide.
In the present embodiment, coal gas pretreatment unit use steam turbine formula compressor as raw gas Compressor, pressurizes for raw gas.Further, above-mentioned boiler is used to provide for this steam turbine formula compressor Steam.Thus, before coal gas pretreatment unit and low temperature washing device for methanol are driven, also include adjusting The step of the load of boiler, thinks and provides steam at raw gas compressor.
To sum up, with reference to Figure 10, after execution of step (s3), the starting method of the present invention defines Technological process as shown in Figure 10, air compressor, coal gas during i.e. boiler is respectively air separation unit are pre- Raw gas compressor in processing means provides steam to drive turbine, and the rectifying column in air separation unit produces Steam is oxygen-enriched delivers to underground gasification as gasifying agent for the some vapor composition of the oxygen that goes out and boiler output Stove, is purified through coal gas pretreatment unit and low temperature washing device for methanol by the raw gas of underground gasification furnace output Rear discharge, mainly contains hydrogen and carbon monoxide in the raw gas of the discharge after this purification, can be containing few The carbon dioxide of amount.
Alternatively, after step (s3) and before execution step (s4), by improving space division The load of device and adjustment underground gasification furnace inject the amount of gasifying agent, maintain the total load of underground gasification furnace In the range of 50% 70%.That is, amount and the adjustment ground of oxygen are provided by improving air separation unit The flow of gasified stove injection gasifying agent, the burning in the coal seam in promotion underground gasification furnace, the most gradually Improve the load of underground gasification furnace to 50% 70%, and maintain it to be less than 70%.
Perform step (s4): when the total load of underground gasification furnace runs in the range of 50% 70% After Wen Ding, circle synthesis is driven, and the raw gas after low temperature washing device for methanol purifies is sent into circle synthesis. Wherein, if in 24 hours, the volume change of gas composition is less than or equal to 0.5% and coal gas produces The rate of change of amount is less than 15%, then it represents that underground gasification furnace is stable.
To sum up, with continued reference to Fig. 8, after execution of step (s4), boiler is respectively in air separation unit Raw gas compressor offer steam in air compressor, coal gas pretreatment unit is to drive turbine, empty The oxygen of the rectifying column output in separating device and the vapour composition steam of boiler output is oxygen-enriched delivers to underground Gasification furnace, by the raw gas of underground gasification furnace output through coal gas pretreatment unit and low temperature washing device for methanol It is expelled to circle synthesis after purification, the raw gas of the discharge after this purification mainly contains hydrogen and an oxidation Carbon, can be containing a small amount of carbon dioxide.In circle synthesis, can complete methane, methyl alcohol, dimethyl ether or The production of alkene.
Step (s5): enter oepration at full load, to adjust underground gasification furnace by adjusting air separation unit Oepration at full load, and adjust coal gas pretreatment unit, low temperature washing device for methanol and circle synthesis and completely bear Lotus runs.Wherein, when air separation unit carries out oepration at full load, its load is 70% 100%；Underground When gasification furnace carries out oepration at full load, its total load is 70% 100%；Coal gas pretreatment unit is carried out During oepration at full load, its load is 70% 100%；When low temperature washing device for methanol carries out oepration at full load, Its load is 70% 100%；When circle synthesis carries out oepration at full load, its load is 70% 100%.
To sum up, in the present embodiment, step (s1) during having performed to step (s3), The total load of underground gasification furnace is increase gradually to 50%, and after step (s4) has performed, by underground The total load of gasification furnace is increase gradually in the range of 50%-70%, and keeps stable operation.Holding In row step (s5), the total load of underground gasification furnace is improved to 70%-100%.On ground During the total load of gasified stove gradually steps up, step up the load of air separation unit accordingly, And progressively each device is driven.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for For those skilled in the art, the present invention can have various modifications and variations.All essences in the present invention Within god and principle, any modification, equivalent substitution and improvement etc. made, should be included in the present invention Protection domain within.

Claims (14)

1. underground gasification furnace and a starting method for ground corollary system, including following step the most successively:
(s1) gasifying agent coal seam of igniting are injected to underground gasification furnace；
(s2) when oxygen consumption and the minimum driving load institute of air separation unit of described underground gasification furnace When the amount of the corresponding oxygen produced is consistent, described air separation unit is driven, and by described air separation unit The oxygen-enriched air of the oxygen discharged and air mixing composition sends into described underground gasification furnace as gasifying agent；
(s3) total load of described underground gasification furnace is adjusted to after assumed load, coal gas pretreatment unit Drive with low temperature washing device for methanol, and the raw gas discharged by described underground gasification furnace is pre-through described coal gas Processing means sends into described low temperature washing device for methanol after purifying；
(s4) circle synthesis is driven, and the raw gas after described low temperature washing device for methanol purifies is sent into institute State circle synthesis；
(s5) by adjusting the entrance oepration at full load of described air separation unit, to adjust described underground gasification Stove oepration at full load, and adjust described coal gas pretreatment unit, described low temperature washing device for methanol and described Circle synthesis carries out oepration at full load.
Starting method the most according to claim 1, it is characterised in that at described step (s3) In,
The oxygen that the carbon dioxide removed by described low temperature washing device for methanol is generated with described air separation unit Mixing composition carbon dioxide is oxygen-enriched；
Described underground gasification furnace is sent into as gasifying agent using oxygen-enriched for described carbon dioxide.
Starting method the most according to claim 2, it is characterised in that
The volumetric concentration of oxygen described in described carbon dioxide is oxygen-enriched is 55% 80%.
Starting method the most according to claim 1, it is characterised in that
The described minimum driving load of described air separation unit is 30%.
Starting method the most according to claim 1, it is characterised in that
In described step (s2),
Maintain the load of described air separation unit in the range of 30% 70%.
Starting method the most according to claim 1, it is characterised in that
In described step (s3): described assumed load is in the range of 30% 50%.
Starting method the most according to claim 6, it is characterised in that
By adjust the load of described air separation unit in the range of 30% 50% and adjust inject described The amount of the gasifying agent of underground gasification furnace, is adjusted to described setting by the total load of described underground gasification furnace and bears Lotus.
Starting method the most according to claim 1, it is characterised in that
After described step (s3) and before performing described step (s4), described by improving The load of air separation unit and the described underground gasification furnace of adjustment inject the amount of gasifying agent, maintain described underground gas Change the total load of stove in the range of 50% 70%.
Starting method the most according to claim 1, it is characterised in that
When described air separation unit carries out oepration at full load, its load is in the range of 70% 100%；
When described underground gasification furnace carries out oepration at full load, its total load 70% 100% scope In；
Described coal gas pretreatment unit, described low temperature washing device for methanol and described circle synthesis are carried out at full capacity During operation, its load is respectively in the range of 70% 100%.
Starting method the most according to claim 1, it is characterised in that
Before described coal gas pretreatment unit is driven, by part or all of by described underground gasification The raw gas that fire grate goes out sends into torch burning.
11. starting methods according to claim 1, it is characterised in that
Air compressor in described air separation unit is steam turbine formula compressor；And/or
Raw gas compressor in described coal gas pretreatment unit is steam turbine formula compressor；And/or
Carbon-dioxide gas compressor during described low-temp methanol is washed is steam turbine formula compressor.
12. starting methods according to claim 11, it is characterised in that
Utilize steam turbine formula compressor described in the part or all of steam drive that boiler produces.
13. starting methods according to claim 12, it is characterised in that
The oxygen that the carbon dioxide removed by described low temperature washing device for methanol, described air separation unit are generated Described underground gasification furnace is sent into as gasifying agent with the steam of the part produced by described boiler.
14. starting methods according to claim 12, it is characterised in that
Before described coal gas pretreatment unit is driven, by part or all of by described underground gasification The raw gas that fire grate goes out sends into described boiler as mixing fuel burning.
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CN107032954A (en) * 2017-05-03 2017-08-11 中为(上海)能源技术有限公司 The method that methanol and its derivative are produced using underground coal gasification(UCG) product gas
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