CN103711471A - Start-up method for underground gasifier and ground matched system - Google Patents

Start-up method for underground gasifier and ground matched system Download PDF

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CN103711471A
CN103711471A CN201310717501.7A CN201310717501A CN103711471A CN 103711471 A CN103711471 A CN 103711471A CN 201310717501 A CN201310717501 A CN 201310717501A CN 103711471 A CN103711471 A CN 103711471A
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gasification furnace
underground gasification
oxygen
load
air separation
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CN103711471B (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 invention relates to a start-up method for an underground gasifier and a ground matched system. The start-up method for the underground gasifier and the ground matched system comprises the following steps that firstly, the underground gasifier is inflated with a gasifying agent and a coal bed is ignited; secondly, when the oxygen consumption of the underground gasifier is consistent with the quantity of oxygen correspondingly generated by an air separation device at the lowest start-up load, the air separation device is started up, the oxygen-enriched air formed by mixing the oxygen exhausted by the air separation device and the air serves as the gasifying agent to be sent to the underground gasifier; thirdly, after the total load of the underground gasifier is adjusted to the set load, a gas preprocessing device and a low-temperature methanol washing device are started up, and the gas preprocessing device purifies the raw gas exhausted by the underground gasifier and sends the purified raw gas into the low-temperature methanol washing device; fourthly, a synthesis ring is started up, the raw gas purified by the low-temperature methanol washing device is sent to the synthesis ring; fifthly, the underground gasifier is adjusted to operate at the full load. The start-up method for the underground gasifier and the ground matched system is efficient and low in consumption.

Description

The starting method of underground gasification furnace and ground corollary system
Technical field
The present invention relates to underground coal gasification(UCG) field, relate in particular to the starting method of a kind of underground gasification furnace and ground corollary system.
Background technology
Utilize coal underground gasification technology can produce air gas, water-gas, semiwater gas and synthesis gas etc., can be applied to IGCC(integrated gasification combined cycle for power generation system) generating, industry/domestic gas etc., it is synthetic for chemical industry that further coal underground gasifying furnace can mate ground chemical plant installations, the chemical products such as methanol, methane.
Underground gasification furnace is produced chemical industry synthesis gas, conventionally adopts oxygen enrichment, pure oxygen as gasifying agent.For quantity-produced chemical system, underground gasification furnace start-up, need to guarantee continuous gasifying agent supply.But the feature of underground gasification furnace is that the demand of initial stage gasifying agent is relatively little, and ground air separation unit and boiler need to possess the normally driving of certain load conventionally, too lowly cannot set up stable operation, too small like this oxygen demand cannot meet the minimum driving burden requirement that air separation unit and boiler are driven.In addition, simultaneously for the production technology that adopts carbon dioxide oxygen enrichment (being formed by carbon dioxide and oxygen) as gasifying agent, carbon dioxide is generally from (coal gas generally purifies by coal gas pretreatment unit and low temperature washing device for methanol successively) in the coal gas in purification process, and only have coal gas amount to reach after certain scale, could meet the driving requirement of coal gas pretreatment unit and low temperature washing device for methanol, thereby utilize the carbon dioxide being removed by low temperature washing device for methanol to consist of underground gasification furnace, provide carbon dioxide oxygen enrichment.In addition it is pointed out that after the normal production of underground gasification furnace,, conventionally can not as the gasification furnace of ground, carry out significantly load adjustment, particularly load can not be adjusted to smaller value from higher value, because this can cause gasification unstable, the synthesis gas of output is difficult to meet technological requirement.
Visible, for quantity-produced chemical system, must be in conjunction with the feature of underground gasification furnace and ground corollary system, the reasonably adjustment of the planning sequencing that wherein each device is driven and each device load.Because this not only relates to the how matching problem with ground corollary apparatus, and relates to problem how to optimize the whole process system goods and materials in ground, personnel, fund.Therefore, how carrying out underground gasification furnace and supporting ground system interlock driving, put into operation, is the technical problem that solution is needed in underground gasification technology scale application badly.
Summary of the invention
For the problem existing in correlation technique, the object of the present invention is to provide the starting method of a kind of efficient, low consumed underground gasification furnace and ground corollary system.
For achieving the above object, the invention provides the starting method of a kind of underground gasification furnace and ground corollary system, comprise as follows step successively: (s1) to underground gasification furnace injected gas agent the coal seam of igniting; (s2) when the amount of the corresponding oxygen of producing of minimum driving load of the oxygen expenditure amount of underground gasification furnace and air separation unit is consistent, air separation unit is driven, and the oxygen-enriched air of the oxygen that air separation unit is discharged and air mixing composition is sent into underground gasification furnace as gasifying agent; (s3) total load of adjusting underground gasification furnace is to assumed load, and coal gas pretreatment unit and low temperature washing device for methanol are driven, and the raw gas that underground gasification furnace is discharged is sent 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) by adjusting air separation unit, enter oepration at full load, to adjust underground gasification furnace oepration at full load, and adjust coal gas pretreatment unit, low temperature washing device for methanol and circle synthesis and carry out oepration at full load.
According to the present invention, the oxygen mix of the carbon dioxide being removed by low temperature washing device for methanol and air separation unit generation is formed to carbon dioxide oxygen enrichment; Carbon dioxide oxygen enrichment is sent into underground gasification furnace as gasifying agent.
According to the present invention, in carbon dioxide oxygen enrichment, the volumetric concentration of oxygen 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 in 30%-70% scope.
According to the present invention, in step (s3): in the scope of assumed load 30%-50%.
According to the present invention, by adjusting the interior amount with adjusting the gasifying agent that injects underground gasification furnace of scope of load to 30%-50% of air separation unit, the total load of underground gasification furnace is adjusted to assumed load.
According to the present invention, step (s3) afterwards and execution step (s4) before, by improving the load of air separation unit and adjusting the amount of underground gasification furnace injected gas agent, maintain the total load of underground gasification furnace in 50%-70% scope.
According to the present invention, when air separation unit carries out oepration at full load, it is loaded in 70%-100% scope; When underground gasification furnace carries out oepration at full load, its total load is in 70%-100% scope; When coal gas pretreatment unit, low temperature washing device for methanol and circle synthesis carry out oepration at full load, it is loaded respectively in 70%-100% scope.
According to the present invention, before coal gas pretreatment unit is driven, by part or whole raw gas of being discharged by underground gasification furnace send into torch burning.
According to the present invention, the air compressor in air separation unit is steam turbine formula compressor; And/or the raw gas compressor in coal gas pretreatment unit is steam turbine formula compressor; And/or the carbon-dioxide gas compressor in low-temperature rectisol is steam turbine formula compressor.
According to the present invention, steam drive steam turbine formula compressor part or whole that utilizes boiler to produce.
According to the present invention, the steam of the oxygen that the carbon dioxide being removed by low temperature washing device for methanol, air separation unit are generated and the part being produced by boiler is sent into underground gasification furnace as gasifying agent.
According to the present invention, before coal gas pretreatment unit is driven, using part or whole raw gas of being discharged by underground gasification furnace as mixing fuel burning, send into boiler.
Than prior art, beneficial effect of the present invention is:
The starting method of underground gasification furnace of the present invention and ground corollary system, successively each device in the corollary system of ground is driven, and load of the device of each in underground gasification furnace and ground corollary system is adjusted gradually in this process, can reduce thus and respectively install the investment at driving initial stage, labor and raw material's consumption, thereby reduce the cost of underground gasification furnace operation maintenance and improved underground gasification furnace and ground corollary system coordinates efficiency and the benefit of carrying out Chemical Manufacture.Particularly, oxygen demand according to underground gasification furnace is driven air separation unit, the total load of adjustment underground gasification furnace after meeting assumed load is driven coal gas pretreatment unit and low temperature washing device for methanol, afterwards circle synthesis is driven to utilize the raw gas after purification to produce such as gases such as methyl alcohol, after above-mentioned each device is driven, underground gasification furnace and above-mentioned each device are adjusted to oepration at full load, to enhance productivity.
The oxygen mix of the carbon dioxide being removed by low temperature washing device for methanol and air separation unit generation is formed to carbon dioxide oxygen enrichment and it is sent into underground gasification furnace as gasifying agent, effectively carbon dioxide reclaimed and utilize, reduce system carbon emission amount, improved the environmental benefit of manufacturing process.In addition, before coal gas pretreatment unit is driven, using part or the whole raw gas of being discharged by underground gasification furnace as boiler, mix burning dyestuff, can put forward high-octane utilization ratio, reduce environment pollution and cost of production.
Accompanying drawing explanation
Fig. 1 is the process chart of first embodiment of the starting method of application underground gasification furnace of the present invention and ground corollary system;
Fig. 2 finishes the process chart after execution step (s2) in the starting method shown in Fig. 1;
Fig. 3 finishes the process chart after execution step (s3) in the starting method shown in Fig. 1;
Fig. 4 is the process chart of second embodiment of the starting method of application underground gasification furnace of the present invention and ground corollary system;
Fig. 5 is the schematic diagram of underground gasification furnace of the 3rd embodiment of the starting method of application underground gasification furnace of the present invention and ground corollary system;
Fig. 6 is the schematic diagram of underground gasification furnace of the 4th embodiment of the starting method of application underground gasification furnace of the present invention and ground corollary system;
Fig. 7 is the schematic diagram of underground gasification furnace of the 5th embodiment of the starting method of application underground gasification furnace of the present invention and ground corollary system;
Fig. 8 is the process chart of the 6th embodiment of the starting method of application underground gasification furnace of the present invention and ground corollary system;
Fig. 9 finishes the process chart after execution step (s2) in the starting method shown in Fig. 8;
Figure 10 finishes the process chart after execution step (s3) in the starting method shown in Fig. 8.
The specific embodiment
First, each device that summary uses in following embodiment.
Underground gasification furnace: the underground gasification furnace that the present invention uses is to have the outlet passageway of at least one inlet channel for injected gas agent, at least one discharge raw gas and the coal underground gasifying furnace that is communicated with the gasification tunnel of inlet channel and outlet passageway.Wherein, raw gas is that subterranean coal and gasifying agent burn, gasification and pyrolytic reaction generate, and main component is carbon monoxide, carbon dioxide, methane, hydrogen, nitrogen and hydrogen sulfide etc., also contains the compositions such as dust, tar, water vapour, phenol ammonia simultaneously.In addition, the total load of underground gasification furnace is the output percentage of the design production capacity of underground gasification furnace therewith of the underground gasification furnace raw gas of discharging, the output of the raw gas that underground gasification furnace is discharged is calculated with the volume of the raw gas of output per hour, and the unit of output is Nm 3/ h.If underground gasification furnace only has an outlet passageway, the total load of underground gasification furnace is the output of the raw gas that outlet passageway is discharged thus.If underground gasification furnace has a plurality of outlet passageways, the output of the raw gas that all outlet passageways of serving as reasons are discharged and.Design production capacity designs raw gas output, for according to volumes that can calculate, this underground gasification furnace raw gas that the unit interval can produce in gasification such as hydrogeological conditions and underground gasification furnace structures.
Air separation unit: air is through the air compressor pressurization of air separation unit, and then part air or whole air carry out cooling, purification, enters afterwards an empty minute rectifying column and carries out separation, finally obtains oxygen, nitrogen.When needs air is as gasifying agent time, only need to be by air pressurized, do not need to carry out cooling, purify with separated; When needs oxygen-enriched air (air and oxygen) is as gasifying agent time, part air can be carried out to separation and obtain 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 the manufacturing process of isolating oxygen in rectifying column and starts.Wherein, the air separation unit that air separation unit used in the present invention is known to the skilled person, utilize this air separation unit using in air, isolate oxygen as the part of gasifying agent for underground gasification furnace, while needing air in gasifying agent, utilize the air compressor generation compressed air in this air separation unit to send into underground gasification furnace.The load of air separation unit refers to the production capacity of air separation unit, and in the present embodiment, the load of air separation unit is to produce the volume of oxygen the unit interval (unit is Nm 3/ h) with the percentage of the production capacity of this air separation unit, wherein, when the production capacity of this air separation unit is dispatched from the factory for it, the condition of work adopting during according to design, the unit interval is interior can produce the volume of oxygen (unit is Nm 3/ h).Certainly the unit of above-mentioned two numerical value also can be Nm 3/ min.Coal gas pretreatment unit: the coal gas pretreatment unit that the coal gas pretreatment unit using in the present invention is known to the skilled person, alternatively, it comprises raw gas washing and compression section, gas liquor separation circuit, phenol recovery process, is mainly used in dedusting, tar removing, washing partial impurities gas (as phenols component).Particularly, the raw gas that contains the impurity compositions such as dirt, tar, phenol ammonia that underground gasification furnace is discharged first enter scrubbing tower and fresh water and reuse waste water counter current contacting wash, cooling, tower bottom flow goes out cooled tar water and delivers to gas liquor separation circuit, raw gas after tower top is washed is delivered to active carbon filter and is trapped micro-tar, fully removes raw gas after tar and after gas-liquid separator separatory, delivers to fed downstream purifier after raw gas compressor boost.Wherein, the load of coal gas pretreatment unit is to process the volume of raw gas the unit interval (unit is Nm 3/ h) process the percentage of the designed output of raw gas with this coal gas pretreatment unit, designed output is the condition of work adopting during according to design, the volume of manageable raw gas in the coal gas pretreatment unit unit interval.The unit of the designed output of coal gas pretreatment unit is Nm 3/ h.For example, designed output is 120000Nm 3/ h(butt), the volume of processing raw gas when the unit interval is 100000Nm 3/ h(butt), time, the load of coal gas pretreatment unit is 83%.The unit of above-mentioned two numerical value also can be Nm 3/ min.
Low temperature washing device for methanol: the low temperature washing device for methanol that the low temperature washing device for methanol using in the present invention is known to the skilled person, it has the effect that removes sour gas (for example hydrogen sulfide, carbon dioxide), and it comprises Ammonic washing tower, cooler, scrubbing tower alternatively.Particularly, raw gas after the preliminary purification of coal gas pretreatment unit first washs in Ammonic washing tower, and ammonia wherein is fully removed, wash raw gas after ammonia through cooler heat exchange, cooling after, isolate moisture.Raw gas enters scrubbing tower hypomere after isolating moisture, and scrubbing tower comprises desulfurization section and decarbonization section.At desulfurization section, above-mentionedly isolate raw gas after moisture through methanol wash, remove the components such as hydrogen sulfide and partial CO 2, enter afterwards decarbonization section.The raw gas that enters decarbonization section is sulfur-bearing not, tower top by the carbon dioxide component in methanol wash raw gas to fully removing, 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 that (unit is Nm for the volume of the raw gas after processing per hour is purified by coal gas pretreatment unit 3/ h) with the percentage of the designed output of this low temperature washing device for methanol, the condition of work (abbreviation operating mode) that the designed output of this low temperature washing device for methanol adopts while referring to according to design, the unit interval can be processed the volume of raw gas, and unit is Nm 3/ h.The unit of above-mentioned two numerical value also can be Nm 3/ min.
Circle synthesis: the circle synthesis using in the present invention is to well known to a person skilled in the art circle synthesis, in following embodiment, it produces methane, methyl alcohol, dimethyl ether, alkene alternatively.For example, the carbon monoxide in the above-mentioned raw gas by obtaining after low temperature washing device for methanol purifies and a small amount of carbon dioxide and hydrogen, under methanation catalyst effect, are generated by methanation reaction, the equation of reaction is: CO+3H 2=CH 4+ H 2o; CO 2+ 4H 2=CH 4+ 2H 2o.If methanol, key reaction equation is: CO+2H 2=CH 3oH; CO 2+ 3H 2=CH 3oH+H 2o.Wherein, the load of circle synthesis refers to that (unit is Nm for the volume of productive target product per hour 3/ h) with the percentage of the designed output of circle synthesis, the condition of work that the designed output of circle synthesis adopts while referring to according to design, the volume of productive target product, unit is Nm 3/ h.For example, giving birth to methanogenic designed output is 40000Nm 3/ h.Certainly, the unit of above-mentioned numerical value also can be Nm 3/ 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 the important safety in chemical plant and environmental protection facility, mainly for the treatment of the fuel gas that cannot carry out under process units shutting down, improper production and the state of emergency effectively reclaiming.
Boiler: the boiler that the present invention uses is to well known to a person skilled in the art boiler, and it is a kind of energy conversion, to boiler input fuel, through boiler conversion, outwards output has the steam of certain heat energy.The load of boiler is that (unit is Nm for the volume of output steam per hour 3/ h) with the percentage of the designed output of boiler.Wherein, the condition of work that the designed output of boiler adopts while referring to according to design, the volume of production steam in the boiler unit interval, unit is Nm 3/ h.Above-mentioned numerical value unit also can be Nm 3/ min, ton/h, ton/d.
Below in conjunction with accompanying drawing, the specific embodiment of the invention is described.
Referring to Fig. 1, an embodiment of the starting method of underground gasification furnace of the present invention and ground corollary system, comprises as follows step successively.
Execution step (s1): to underground gasification furnace injected gas agent the coal seam of igniting.Wherein, underground gasification furnace for execution step (s1) before, at the built-in underground gasification furnace having stood in gasification region of predetermined exploitation.The arrangement of underground gasification hotplate body depends on specifically geology and the hydrologic regime such as the trend, tendency, cranny development situation, water yield in coal seam in the gasification region of predetermined exploitation.In underground gasification furnace layout area, by ground, to coal seam, carried out drilling well and set up inlet channel, outlet passageway and gasification tunnel etc.According to coal seam framework, selected ignition zone, lights a fire to underground gasification furnace, with the coal seam of igniting.In the process of igniting at underground gasification furnace, the gasifying agent of injection is for example air or oxygen, and after igniting in coal seam, can regulate and control by the oxygen content in adjusting gasifying agent the burning in coal seam.Alternatively, when lighting coal seam, use air as gasifying agent.After igniting in coal seam, gradually become the oxygen-enriched air of air and oxygen composition as gasifying agent.In the present embodiment, above-mentioned air and oxygen are provided by the equipment of well known to a person skilled in the art.
Execution step (s2): when the amount of the oxygen expenditure amount of underground gasification furnace and the corresponding oxygen of producing of minimum driving load of air separation unit is consistent, air separation unit driving.Particularly, " the driving load of air separation unit " equals the percentage that " amount of the oxygen that air separation unit is produced " obtains divided by " air separation unit is produced the ability of oxygen ".For example, while equaling " the minimum driving load of air separation unit (30%) " when the driving of the air separation unit " load ", correspondingly exist corresponding with it " amount of the oxygen that air separation unit is produced ".Further, for air separation unit, the amount of the oxygen that air separation unit is produced is the volume of the unit interval producing oxygen, when it reaches certain numerical value, could set up stable operation to air separation unit, and because the production capacity (producing the ability of oxygen) of air separation unit is known, so the air separation unit unit interval is produced the volume of oxygen and the load of air separation unit is corresponding.In addition, the gasifying agent of sending into underground gasification furnace configures by a certain percentage, and the percent by volume of the oxygen in gasifying agent and the percent by volume of air are known, and when gasifying agent total flow, (volume of the gasifying agent of consumption per hour, unit is Nm 3/ h) after determining, just can calculative determination oxygen expenditure amount, specific air consumption, wherein, (unit is Nm to the volume of the oxygen that oxygen expenditure amount is consumption per hour 3(unit is Nm to the volume of the air that/h), specific air consumption is consumption per hour 3/ h).Can understand, the oxygen expenditure amount of underground gasification furnace is the oxygen of how many standard cubic meters of consumption per hour, and to produce the volume of oxygen be oxygen can how many standard cubic meters of output per hour the air separation unit unit interval, when the carrier of oxygen accumulated amount of air separation unit output per hour meets the carrier of oxygen accumulated amount of underground gasification furnace needs per hour, air separation unit is driven, thus, can guarantee the stable operation of air separation unit.
In addition, in the present embodiment, after air separation unit is driven, the compressed air that air compressor in air separation unit is produced and the oxygen-enriched air being comprised of the isolated oxygen of rectifying column inject underground gasification furnace as gasifying agent, can understand, now, the gasifying agent that underground gasification furnace passes into provides by air separation unit, in other words, after air separation unit is driven, the oxygen-enriched air that the air of air separation unit output and oxygen form injects the gasifying agent of underground gasification furnace before having replaced air separation unit to drive.Alternatively, the compressed air and the isolated oxygen of rectifying column that first air compressor are produced are sent into gas mixing device, after mixing by a certain percentage, form gasifying agent, and capable of regulating flow quantity ground is injected into gasifying agent in the inlet channel of underground gasification furnace.Certainly, according to the operation conditions of underground gasification furnace, the oxygen in adjustable above-mentioned oxygen-enriched air and the ratio of air.In embodiment alternatively, also can only pass into air or oxygen according to the operation conditions of underground gasification furnace.
In the present embodiment, the air compressor in air separation unit is steam turbine formula compressor, by boiler, for this steam turbine formula compressor provides steam.Thus, before air separation unit is driven, steam heating boiler is first driven, for the steam turbine of air compressor provides steam.
Further, after in step (s2), air separation unit is driven, before coal gas pretreatment unit and low temperature washing device for methanol are driven in step (s3), the raw gas part that underground gasification furnace can be produced or whole torches of delivering to carry out burning and exhausting or part or whole sending into boiler as mixing fuel burning.Due to now not oepration at full load of underground gasification furnace, and underground gasification furnace is in initial operating stage, and the active principle content of its raw gas is lower, is introduced into thus torch burning and can effectively prevents its discharge after stain air.And mix burning dyestuff using raw gas as boiler, and can put forward high-octane utilization ratio, reduce environment pollution and cost of production.
In addition, after air separation unit is driven, the load of air separation unit is maintained in 30%-70% scope, in the present embodiment, the load of air separation unit is maintained in 30%-50% scope.Wherein, can pass through the amount of the gasifying agent of adjustment underground gasification furnace, or the number of units of the sub-gasification furnace putting into operation in underground gasification furnace.Certainly, also can by additive method, control the load of air separation unit, for example, adjust the load of boiler.
To sum up, with reference to Fig. 2, after execution of step (s2), starting method of the present invention has formed technological process as shown in Figure 2, being boiler provides steam for air separation unit, the oxygen-enriched air that after air separation unit driving, the oxygen of output and air form is transported to underground gasification furnace as gasifying agent by pipe network, and a part for the raw gas of underground gasification furnace production is delivered to torch and carry out burning and exhausting, and another part is delivered to boiler as mixing fuel burning.
Execution step (s3): take gasification furnace water yield, coal seam thickness, raw gas component and calorific value, gasification efficiency is foundation, adjusts the injection flow of gasifying agent, thereby improves the total load of underground gasification furnace, until it equals assumed load.Particularly, in the process of underground coal gasification(UCG), the injection flow of gasification furnace water yield, coal seam thickness and gasifying agent has certain functional relation, that is, under certain coal seam thickness and water yield, have a best gasifying agent and inject flow.In actual gasification, the component of the raw gas that can discharge by underground gasification furnace outlet passageway and calorific value and gasification efficiency judge that whether the injection flow of gasifying agent is suitable.Thus, by raw gas component and calorific value and gasification efficiency, regulate the injection flow of gasifying agent, promote the burning in coal seam, thereby improve the total load of underground gasification furnace.
In the present embodiment, above-mentioned assumed load is 50%.Particularly, by adjusting the load to 50% of air separation unit and the amount that the gasifying agent of underground gasification furnace is injected in adjustment, the total load of underground gasification furnace is adjusted to assumed load.Thus, by adjusting the load to 50% of air separation unit, can control the oxygen demand in the process that amount of oxygen that air separation unit provides meets the total load that improves underground gasification furnace, by adjustment, inject the amount of the gasifying agent of underground gasification furnace, controllably descend the combustion position in gasification furnace, strengthen gradually thus the burning in coal seam, improve the output of raw gas.
When the total load of underground gasification furnace reaches after above-mentioned assumed load, coal gas pretreatment unit and low temperature washing device for methanol are driven, and the raw gas that underground gasification furnace is discharged passes into the purification of coal gas pretreatment unit, be that dedusting, tar removing, washing partial impurities gas are as phenols component, and the raw gas after said process purifies is anhydrated minute and pressurization after deliver to low temperature washing device for methanol and again purify, remove sour gas hydrogen sulfide, carbon dioxide.The oxygen mix of the carbon dioxide being removed by low temperature washing device for methanol and air separation unit generation is formed to carbon dioxide oxygen enrichment, and this carbon dioxide oxygen enrichment is sent into underground gasification furnace as gasifying agent.Can understand, above-mentioned carbon dioxide oxygen enrichment has replaced oxygen-enriched air that air that coal gas pretreatment unit and low temperature washing device for methanol provide by air separation unit before driving and oxygen forms as gasifying agent, in other words, the gasifying agent that passes into underground gasification furnace is carbon dioxide oxygen enrichment.Alternatively, in carbon dioxide oxygen enrichment, the volumetric concentration of oxygen is 55%-80%.Certainly be not limited to the present embodiment, intelligible, whether use carbon dioxide oxygen enrichment and when use carbon dioxide oxygen enrichment, be that to take the practical operation situation of underground gasification furnace be foundation.When without use carbon dioxide oxygen enrichment, can continue to use oxygen-enriched air as gasifying agent.
In the present embodiment, using steam turbine formula compressor as raw gas compressor in coal gas pretreatment unit, is raw gas pressurization.And, use above-mentioned boiler to provide steam for this steam turbine formula compressor.And low temperature washing device for methanol comprises carbon-dioxide gas compressor, the carbon dioxide removing is sent into underground gasification furnace after compression.Preferably, this carbon-dioxide gas compressor is steam turbine formula compressor, and, use above-mentioned boiler to provide steam for this steam turbine formula compressor.Thus, before coal gas pretreatment unit and low temperature washing device for methanol driving, also comprise the step of the load of adjusting boiler, think at raw gas compressor and carbon-dioxide gas compressor steam is provided.
To sum up, with reference to Fig. 3, after execution of step (s3), starting method of the present invention has formed technological process as shown in Figure 3, be that boiler is respectively the air compressor in air separation unit, raw gas compressor in coal gas pretreatment unit 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 carbon dioxide that low temperature washing device for methanol removes form carbon dioxide oxygen enrichment and deliver to underground gasification furnace as gasifying agent, raw gas by underground gasification furnace output is discharged after coal gas pretreatment unit and low temperature washing device for methanol purification, in the raw gas of the discharge after this purification, mainly contain hydrogen and carbon monoxide.
Alternatively, step (s3) afterwards and execution step (s4) before, by improving the load of air separation unit and adjusting the amount of underground gasification furnace injected gas agent, maintain the total load of underground gasification furnace in 50%-70% scope.; by improving air separation unit, provide the amount of oxygen and the flow of adjusting underground gasification furnace injected gas agent, promote the burning in the coal seam in underground gasification furnace, improve gradually thus the raw gas output of underground gasification furnace; until load reaches in 50%-70% scope, and maintain it and be no more than 70%.
Execution step (s4): after stable in the total load of the underground gasification furnace scope 50%-70%, circle synthesis driving, sends the raw gas after low temperature washing device for methanol purifies into circle synthesis.Wherein, if in 24 hours, the volume change of gas composition be less than or equal to 0.5% and the rate of change of gas yield be less than 15%, represent that underground gasification furnace is stable.
To sum up, continuation is with reference to Fig. 1, after execution of step (s4), boiler is respectively the air compressor in air separation unit, raw gas compressor in coal gas pretreatment unit 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 carbon dioxide that low temperature washing device for methanol removes form gasifying agent and deliver to underground gasification furnace, raw gas by underground gasification furnace output is expelled to circle synthesis after coal gas pretreatment unit and low temperature washing device for methanol purification, in the raw gas of the discharge after this purification, mainly contain hydrogen and carbon monoxide.In circle synthesis, can complete the production of methane, methyl alcohol, dimethyl ether or alkene.
Step (s5): enter oepration at full load by adjusting air separation unit, to adjust underground gasification furnace oepration at full load, and adjust coal gas pretreatment unit, low temperature washing device for methanol and circle synthesis and carry out oepration at full load.Wherein, when air separation unit carries out oepration at full load, it is loaded in 70%-100% scope; When underground gasification furnace carries out oepration at full load, its total load is in 70%-100% scope; When coal gas pretreatment unit carries out oepration at full load, it is loaded in 70%-100% scope; When low temperature washing device for methanol carries out oepration at full load, it is loaded in 70%-100% scope; When circle synthesis carries out oepration at full load, it is loaded in 70%-100% scope.
To sum up, in the present embodiment, by step (s1) to the complete process of step (s3), the total load of underground gasification furnace is increased to 50% gradually, and after step (s4) is complete, the total load of underground gasification furnace is increased to gradually in the scope of 50%-70%, and keeps stable operation.In execution step (s5), the total load of underground gasification furnace is increased in the scope of 70%-100%.In the process that the total load of underground gasification furnace improves gradually, progressively boiler, air separation unit, coal gas pretreatment unit, low temperature washing device for methanol, circle synthesis are driven, and corresponding load that progressively improves each device.
Thus, by above-mentioned starting method, successively each device in the corollary system of ground is driven, and load of the device of each in underground gasification furnace and ground corollary system is adjusted gradually in this process, can reduce thus and respectively install the investment at driving initial stage, labor and raw material's consumption, thereby reduce the cost of underground gasification furnace operation maintenance and improved underground gasification furnace and ground corollary system coordinates efficiency and the benefit of carrying out Chemical Manufacture.Particularly, oxygen demand according to underground gasification furnace is driven air separation unit, the total load of adjustment underground gasification furnace after meeting assumed load is driven coal gas pretreatment unit and low temperature washing device for methanol, afterwards circle synthesis is driven to utilize the raw gas after purification to produce such as gases such as methyl alcohol, after above-mentioned each device is driven, underground gasification furnace and above-mentioned each device are adjusted to oepration at full load, to enhance productivity.
In addition, the oxygen mix of the carbon dioxide being removed by low temperature washing device for methanol and air separation unit generation is formed to carbon dioxide oxygen enrichment and it is sent into underground gasification furnace as gasifying agent, effectively carbon dioxide reclaimed and utilize, reduce system carbon emission amount, improved the environmental benefit of process.
With reference to Fig. 4, second embodiment of the present invention, repeats no more with the something in common of above-mentioned first embodiment.In the present embodiment, in order to obtain preferably coal gas active principle, according to the difference of coal seam ash fusion point, water content, gasification furnace furnace temperature etc., steam can suitably make up water in gasifying agent.When need to be when adding steam to regulate the active principle in the raw gas of output, the steam of the carbon dioxide being removed by low temperature washing device for methanol, oxygen that air separation unit generates and the part that produced by boiler be sent into underground gasification furnace as gasifying agent.Can understand, the gasifying agent using before the gasifying agent being now comprised of oxygen, carbon dioxide and steam replaces, the gasifying agent being comprised of oxygen, carbon dioxide and steam replaces carbon dioxide oxygen enrichment.In other words, now, the gasifying agent being injected in underground gasification furnace is all the gasifying agent being comprised of oxygen, carbon dioxide and steam.Certainly, can understand, whether gasifying agent comprises steam and when uses the gasifying agent with steam, and the practical operation situation of underground gasification furnace of take is foundation.
With reference to Fig. 5, illustrate the underground gasification furnace of the 3rd embodiment of the starting method of applying underground gasification furnace of the present invention and ground corollary system.
In execution step (s1) before, set up underground gasification furnace.Particularly, in the present embodiment, in the mining area of predetermined gasification, set up n sub-gasification furnace, n depends on reserves, underground gasification furnace design size and the synthesis gas production scale etc. of coal in mining area.As shown in Figure 4, every sub-gasification furnace consists of 1 directional drilling and 1 vertical drilling, coiled tubing and corollary apparatus, consist of in directional drilling and as inlet channel a, upright opening is as outlet passageway b, inlet channel a and outlet passageway b are communicated with by gasification tunnel c.Complete thus the foundation of a sub-gasification furnace, in the present embodiment, n sub-gasification furnace forms underground gasification furnace.And in Fig. 4, first sub-gasification furnace 1, second sub-gasification furnace 2 are until leave isolated coal pillar between n sub-gasification furnace n.
Execution step (s1): by n sub-gasification furnace outlet passageway separately, transfer igniter, adopt silane and methane to put the injected gas agent of fighting, the coal seam of igniting, and utilize thermocouple detected temperatures, ignite in confirmation coal seam.Adopt control injection point backing (CRIP) gasifying process to produce, this technique by coiled tubing direct oxygen injection (being gasifying agent) to maintain burning and the gasification in coal seam, and controlledly retreat (direction by outlet passageway to inlet channel) by coiled tubing, control the position of coal combustion and gasification, the distance once retreating depends on the size of cavity-growth and the gas injection ability of gasifying agent.In the present embodiment, above-mentioned oxygen is provided by the equipment of well known to a person skilled in the art.
Execution step (s2): when the oxygen expenditure amount of underground gasification furnace and the minimum driving of air separation unit are loaded the amount of the corresponding oxygen of producing when consistent, time, boiler is driven and for the turbine of air compressor in air separation unit provides steam, air separation unit is driven afterwards., minimum driving load is 30% in the present embodiment.Air compressor starts, by the air after air compressor pressurization with form oxygen-enriched air by the isolated oxygen of rectifying column, this oxygen-enriched air is transported to each sub-gasification furnace as gasifying agent by pipe network, through coiled tubing, be transported to flame range again, and the raw gas of each sub-gasification furnace being produced by outlet passageway is delivered to torch and is carried out burning and exhausting.Wherein, after air separation unit is driven, the air of the air compressor pressurization in air separation unit and the oxygen-enriched air being comprised of the isolated oxygen of rectifying column have replaced above-mentioned oxygen as gasifying agent, that is, the gasifying agent that now injects each gasification furnace is only the air being pressurizeed by above-mentioned air compressor.Preferably, in oxygen-enriched air, the volumetric concentration of oxygen is 35%.
Execution step (s3): adjust the load of boiler load and air compressor, so that in the scope of air separation unit load adjustment to 30%-50%.And according to gasification furnace water yield, coal seam thickness, calorific value of gas, gasification efficiency etc., adjust the amount of the gasifying agent that underground gasification furnace injects, the total load of underground gasification furnace is reached in 30%-50% scope gradually.After commissioning test is stable, in 24 hours, the volume change of gas composition be less than or equal to 0.5% and the rate of change of gas yield be less than in 15% situation, adjustment Boiler Steam load, for the raw gas compressor in coal gas pretreatment unit provides steam to drive turbine, coal gas pretreatment unit is driven.Coal gas pretreatment unit washs coal gas, removes the impurity such as tar in coal gas, dirt, phenol ammonia, by raw gas compressor, raw gas is carried out to supercharging after raw gas being isolated to moisture afterwards.After coal gas pretreatment unit is driven, low temperature washing device for methanol is driven, the raw gas of sending into after coal gas pretreatment unit purifies removes sour gas hydrogen sulfide wherein, carbon dioxide etc. through low temperature washing device for methanol, wherein, adjustment Boiler Steam load, starts carbon-dioxide gas compressor, will after carbon dioxide pressurization, be delivered to underground gasification furnace, the oxygen mix of carrying with air separation unit is made into the carbon dioxide oxygen enrichment that carrier of oxygen volume concentrations is 55%-80%, 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, improve the content of the active principle in the raw gas of output, using carbon dioxide and oxygen as gasifying agent, before replacing as the air of gasifying agent, that is the gasifying agent that, passes into 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 improve the load of air separation unit, increase oxygen quantity delivered, and adjust accordingly each sub-gasification furnace injected gas agent flow (, air inflow), thereby improve the load of part or all of sub-gasification furnace, the total load of underground gasification furnace is maintained in 50%～70% scope.Particularly, in actual mechanical process, each sub-gasification furnace passes through independently air intake control system alternatively, for example adjust the aperture of air inlet boring valve, change the air inflow of each sub-gasification furnace, thereby control the production load of each sub-gasification furnace, and then control the total load of underground gasification furnace.Execution step (s4): after commissioning test is stable, in 24 hours, the volume change of gas composition be less than or equal to 0.5% and the rate of change of gas yield be less than in 15% situation, circle synthesis is driven.The raw gas that underground gasification furnace is produced is sent into circle synthesis after coal gas pretreatment unit and low temperature washing device for methanol purification.So far, whole underground gasification furnace and ground corollary system complete drives and puts into operation, and gets through production procedure, produces the gases such as above-mentioned methyl alcohol.
Execution step (s5): progressively 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, when air separation unit carries out oepration at full load, it is loaded in 70%-100% scope; When each sub-gasification furnace carries out oepration at full load, it is loaded in 70%-100% scope; When coal gas pretreatment unit carries out oepration at full load, it is loaded in 70%-100% scope; When low temperature washing device for methanol carries out oepration at full load, it is loaded in 70%-100% scope; When circle synthesis carries out oepration at full load, it is loaded in 70%-100% scope.
With reference to Fig. 6, illustrate the underground gasification furnace of the 4th embodiment of the starting method of applying underground gasification furnace of the present invention and ground corollary system.
Front in execution step (s1), set up underground gasification furnace.In the present embodiment, on selected gasification coalfield, set up a underground gasification furnace, the size of underground gasification furnace and structural configuration thereof depend on the daily output of coal reserves, raw gas, the design product term of the capacity of each boring, underground gasification furnace and the hydrology, the geological conditions of ocurrence of coal seam.By the output of raw gas, (unit is Nm 3/ h) and hour exhaust capacity of each boring, determine the quantity of every row hole drilling; According to the design viability of underground gasification furnace, determine to beat some row hole drillings.If the raw gas output of a underground gasification furnace does not reach design output, can, by plural underground gasification furnace multiple operation, produce raw gas simultaneously.Shown in Fig. 6 is a underground gasification furnace, some row hole drillings, consists of, and boring is upright opening, and 10～12 of general every row hole drillings specifically depend on raw gas production scale and each exhaust capacity hourly of holing.First three row hole drilling of first constructing, and complete the construction of the supporting pipe network in ground.After above-mentioned upright opening is set up, boiler is driven, for the turbine of air compressor provides steam.Air compressor starts afterwards, and the air after pressurization, by pipe network, is transported to underground gasification furnace, cold conditions pressure break 11 ' and 12 ' boring, make to set up and be communicated with between two borings, selects 11 ' as outlet passageway, 12 ' as inlet channel, and lights a fire in 11 ' boring, lights coal seam.After lighting a fire successfully, adopt reverse firepower to connect, between 11 ' and 12 ' boring, after reaming, forming gasification tunnel, in 13 ' and 12 ' boring, carry out pressure break simultaneously.Using such method, progressively connects other upright openings on this row, and the outlet passageway using this row hole drilling as underground gasification furnace.
Afterwards, cold conditions pressure break second row boring, and by the reverse firepower method of perforationing, the passage that gas drilling hole is communicated with that goes out of foundation and above-mentioned underground gasification furnace, is communicated with 11 ' as 21 ', 22 ' and 12 ' holes and be communicated with etc.Thus, set up being successively communicated with of second row boring and first row boring, second row hole as inlet channel, thus the boring of each in first row with its corresponding second row in each sub-gasification furnace of formation of holing.In process of establishing of these two rows, air compressor in air separation unit is driven as it provides the air after the pressurization of perforation, and provides air as gasifying agent when reverse perforation.In this process, the rectifying column of air separation unit does not bring into operation, and is about to compressed air that air compressor discharges and delivers to the manufacturing process of isolating oxygen in rectifying column and do not start, and air separation unit is not driven thus.Wherein, cold conditions pressure break is between two vertical drillings, to set up the method for operating of airflow connection relation, specifically refer at a vertical drilling and be pressed into pressure-air, because coal seam has certain hole and crack, after air pressure acquires a certain degree, air can flow in coal seam, and flows out from another boring, thereby two borings are communicated with in coal seam.
Execution step (s1): in the present embodiment, the perforation of underground gasification furnace and gasification are carried out continuously, therefore the flame in perforation process can continue to light coal seam when injecting air, makes it enter forward gasification.That is, the compressed air that air compressor is discharged, as gasifying agent along admission line, is holed along air inlet via arm, gasifying agent is sent in gasification tunnel, started to carry out forward gasification, and, in gasification, gradually oxygen and air mixing are sent in gasification tunnel.The raw gas producing is sent in outlet pipe via arm along going out gas drilling hole.In the present embodiment, above-mentioned oxygen is provided by the equipment of well known to a person skilled in the art.
Execution step (s2): air separation unit driving when the amount of the oxygen expenditure amount of underground gasification furnace and the corresponding oxygen of producing of minimum driving load of air separation unit is consistent.The oxygen and the air that by air separation unit, are produced are injected in underground gasification furnace as gasifying agent.Wherein, in order to maintain the continuity of gasification, when gasifying, synchronously connect the 3rd row hole drilling, in coal seam, set up passage with second row boring and be interconnected; Drilling well or Construction in Preparatory Stage are synchronously carried out in follow-up each row's boring.In the present embodiment, minimum driving load equals 30%.
Execution step (s3): (load of air compressor is the compressed-air actuated volume of output per hour to the load of adjustment boiler load and air compressor, and unit is Nm 3/ h), so that air separation unit load adjustment to 30%-50%.And according to gasification furnace water yield, coal seam thickness, calorific value of gas, gasification efficiency etc., adjust the amount of the gasifying agent that injects underground gasification furnace, make the total load of underground gasification furnace reach 30%-50% gradually.After commissioning test is stable, in 24 hours, the volume change of gas composition be less than or equal to 0.5% and the rate of change of gas yield be less than in 15% situation, adjust the load of boiler, for raw gas compressor provides, drive the wherein air of turbine, coal gas pretreatment unit is driven.Coal gas pretreatment unit washs coal gas, removes the impurity such as tar in coal gas, dirt, phenol ammonia, and supercharging after isolating moisture.After coal gas pretreatment unit is driven, low temperature washing device for methanol is driven, the raw gas of sending into after coal gas pretreatment unit purifies removes sour gas hydrogen sulfide wherein, carbon dioxide etc. through low temperature washing device for methanol, wherein, adjustment Boiler Steam load, starts carbon-dioxide gas compressor, will after carbon dioxide pressurization, be delivered to underground gasification furnace, the oxygen mix of carrying with air separation unit is made into the carbon dioxide oxygen enrichment that carrier of oxygen volume concentrations is 55%-80%, substitutes oxygen-enriched air as gasifying agent.After boiler, air separation unit, coal gas pretreatment unit, low temperature washing device for methanol are driven, progressively improve the load to 50% of air separation unit, to increase oxygen quantity delivered, and adjust accordingly the air inflow (the injection flow of gasifying agent) of each sub-gasification furnace, thereby improve the load of part or all of sub-gasification furnace, make the total load of underground gasification furnace maintain 50%～70%.
Execution step (s4): after commissioning test is stable, in 24 hours, the volume change of gas composition be less than or equal to 0.5% and the rate of change of gas yield be less than in 15% situation, circle synthesis is driven.The raw gas that underground gasification furnace is produced is sent into circle synthesis after coal gas pretreatment unit and low temperature washing device for methanol purification.So far, whole underground gasification furnace and ground corollary system complete drives and puts into operation, and gets through production procedure.
Execution step (s5): progressively 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, when air separation unit carries out oepration at full load, its load is 70%-100%; When each sub-gasification furnace carries out oepration at full load, it is loaded 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%; When circle synthesis carries out oepration at full load, its load is 70%-100%.
With reference to Fig. 7, illustrate the underground gasification furnace of the 5th embodiment of the starting method of applying underground gasification furnace of the present invention and ground corollary system.
In execution step (s1) before, set up underground gasification furnace.In the present embodiment, underground gasification furnace is a multiple row gasification furnace, this gasification furnace consists of a plurality of directional drillings, general 4～6, directional drilling is arranged in parallel, end is communicated with by another directional drilling, and the end of this Directional Drilling comprises at least one vertical drilling, and the quantity of boring depends on the design production capacity of underground gasification furnace and the exhaust capacity of boring.First construct the 1st row, the 2nd row directional drilling and vertical drilling; Afterwards, in vertical drilling, transfer igniter, the coal seam of igniting.After lighting a fire successfully, first, boiler is driven, and starts air compressor, and air is passed through to pipe network, be transported to underground gasification furnace, take this vertical drilling as outlet passageway b ' ', and Directional Drilling is inlet channel a ' ', carries out reverse firepower perforation, processing Directional Drilling horizontal channel is as the gasification tunnel c ' ' of gasification furnace, and the raw gas that outlet passageway is produced underground gasification furnace is delivered to torch and carried out burning and exhausting.After passage has built, the compressed air that the air compressor of usining is discharged is as gasifying agent, send into underground gasification furnace, start to carry out forward gasification, and in this process, gradually oxygen and the mixing of above-mentioned air are sent into underground gasification furnace as gasifying agent, the coal gas of generation is sent in coal gas main pipeline via arm along going out gas drilling hole.In order to maintain the continuity of gasification, when gasifying, synchronously connect second Directional Drilling and build; Follow-up each directional drilling synchronously carries out drilling well or Construction in Preparatory Stage.In the present embodiment, above-mentioned oxygen is provided by the equipment of well known to a person skilled in the art.
In the present embodiment, step (s2) is identical with the 3rd embodiment to step (s5), repeats no more.
With reference to Fig. 8, illustrate the process chart of the 6th embodiment of the starting method of applying underground gasification furnace of the present invention and ground corollary system.
Execution step (s1): to underground gasification furnace injected gas agent the coal seam of igniting.Wherein, underground gasification furnace is in execution step (s1) before, at the built-in underground gasification furnace having stood in gasification region of predetermined exploitation.The arrangement of underground gasification hotplate body depends on specifically geology and the hydrologic regime such as the trend, tendency, cranny development situation, water yield in coal seam in the gasification region of predetermined exploitation.In underground gasification furnace layout area, by ground, to coal seam, carried out drilling well and set up inlet channel, outlet passageway and gasification tunnel etc.According to coal seam framework, selected ignition zone, lights a fire to underground gasification furnace, with the coal seam of igniting.In the process of igniting at underground gasification furnace, the gasifying agent of injection is for example air or oxygen, and after igniting in coal seam, can regulate and control by the oxygen content in adjusting gasifying agent the burning in coal seam.Alternatively, when lighting coal seam, use air as gasifying agent.After igniting in coal seam, gradually become the oxygen-enriched air of air and oxygen composition as gasifying agent.
Execution step (s2): when the amount of the oxygen expenditure amount of underground gasification furnace and the corresponding oxygen of producing of minimum driving load of air separation unit is consistent, air separation unit is driven, and in the present embodiment, the minimum driving of air separation unit is loaded and equaled 30%.
In addition,, after air separation unit is driven, air separation unit is discharged to the oxygen-enriched air of oxygen and air mixing composition and send into underground gasification furnace as gasifying agent.In the present embodiment, air after the pressurization that air compressor in air separation unit produces and the oxygen-enriched air being comprised of the isolated oxygen of rectifying column inject underground gasification furnace as gasifying agent, can understand, now, the gasifying agent that underground gasification furnace passes into provides by air separation unit, in other words, after air separation unit is driven, the oxygen-enriched air that the air of air separation unit output and oxygen form injects the gasifying agent of underground gasification furnace before having replaced air separation unit to drive.Alternatively, the compressed air and the isolated oxygen of rectifying column that first air compressor are produced are sent into gas mixing device, after mixing by a certain percentage, form gasifying agent, and capable of regulating flow quantity ground is injected into gasifying agent in the inlet channel of underground gasification furnace.Certainly, according to the operation conditions of underground gasification furnace, the oxygen in adjustable above-mentioned oxygen-enriched air and the ratio of air.In embodiment alternatively, also can only pass into air or oxygen according to the operation conditions of underground gasification furnace.
In the present embodiment, the air compressor in air separation unit is steam turbine formula compressor, by boiler, for this steam turbine formula compressor provides steam.Thus, before air separation unit is driven, steam heating boiler is first driven, for the steam turbine of air compressor provides steam.
Further, after in step (s2), air separation unit is driven, before coal gas pretreatment unit and low temperature washing device for methanol are driven in step (s3), the raw gas part that underground gasification furnace can be produced or whole torches of delivering to carry out burning and exhausting or part or whole sending into boiler as mixing fuel burning.
In addition, after air separation unit is driven, the load of air separation unit is maintained in 30%-50% scope.Wherein, can pass through the amount of the gasifying agent of adjustment underground gasification furnace, or the number of units of the sub-gasification furnace putting into operation in underground gasification furnace.Certainly, also can by additive method, control the load of air separation unit, for example, adjust the load of boiler.
To sum up, with reference to Fig. 9, after execution of step (s2), starting method of the present invention has formed technological process as shown in Figure 9, being boiler provides steam for air separation unit, the oxygen-enriched air that after air separation unit driving, the oxygen of output and air form is transported to underground gasification furnace as gasifying agent by pipe network, and the raw gas of underground gasification furnace production is delivered to torch and carry out burning and exhausting and deliver to boiler as mixing fuel burning.
Execution step (s3): send in underground gasification furnace as gasifying agent by the steam of the isolated oxygen of air separation unit and boiler is formed to steam oxygen enrichment, and adjust the load to 50% of air separation unit, the total load of adjusting underground gasification furnace reaches 50%.Can understand, in the present embodiment, above-mentioned steam oxygen enrichment substitutes above-mentioned oxygen-enriched air as gasifying agent, and in other words, the gasifying agent of now sending into underground gasification furnace is only the steam oxygen enrichment being comprised of steam and oxygen.Thus, can promote the burning in coal seam in underground gasification furnace, improve the total load of underground gasification furnace.In addition, the steam in gasifying agent can improve the content of active principle in raw gas, improves thus the follow-up production efficiency such as gases such as methane.
Certainly, also can above-mentioned oxygen-enriched air be replaced with to steam oxygen enrichment as gasifying agent in all the other steps, time of replacing and whether replacing, whether whether to need to improve the content of the active principle in raw gas, or to need demands such as the temperature of the flame face of underground gasification furnace regulate be foundation.
When the total load of underground gasification furnace reaches after above-mentioned assumed load, coal gas pretreatment unit and low temperature washing device for methanol are driven, and the raw gas that underground gasification furnace is discharged passes into the purification of coal gas pretreatment unit, be that dedusting, tar removing, washing partial impurities gas are as phenols component, and the raw gas after said process purifies is anhydrated minute 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, using steam turbine formula compressor as raw gas compressor in coal gas pretreatment unit, is raw gas pressurization.And, use above-mentioned boiler to provide steam for this steam turbine formula compressor.Thus, before coal gas pretreatment unit and low temperature washing device for methanol driving, also comprise the step of the load of adjusting boiler, think at raw gas compressor steam is provided.
To sum up, with reference to Figure 10, after execution of step (s3), starting method of the present invention has formed technological process as shown in Figure 10, be that boiler is respectively the air compressor in air separation unit, raw gas compressor in coal gas pretreatment unit provides steam to drive turbine, the part vapour composition steam oxygen enrichment of the oxygen of the rectifying column output in air separation unit and boiler output is delivered to underground gasification furnace as gasifying agent, raw gas by underground gasification furnace output is discharged after coal gas pretreatment unit and low temperature washing device for methanol purification, in the raw gas of the discharge after this purification, mainly contain hydrogen and carbon monoxide, can contain a small amount of carbon dioxide.
Alternatively, step (s3) afterwards and execution step (s4) before, by improving the load of air separation unit and adjusting the amount of underground gasification furnace injected gas agent, maintain the total load of underground gasification furnace in 50%-70% scope.That is, by improving air separation unit, provide the amount of oxygen and the flow of adjusting underground gasification furnace injected gas agent, promote the burning in the coal seam in underground gasification furnace, improve gradually thus load to 50%-70% of underground gasification furnace, and maintain it and be no more than 70%.
Execution step (s4): after stable in the total load of the underground gasification furnace scope 50%-70%, circle synthesis driving, sends the raw gas after low temperature washing device for methanol purifies into circle synthesis.Wherein, if in 24 hours, the volume change of gas composition be less than or equal to 0.5% and the rate of change of gas yield be less than 15%, represent that underground gasification furnace is stable.
To sum up, continuation is with reference to Fig. 8, after execution of step (s4), air compressor, the raw gas compressor in coal gas pretreatment unit that boiler is respectively in air separation unit provide steam to drive turbine, the vapour composition steam oxygen enrichment of the oxygen of the rectifying column output in air separation unit and boiler output is delivered to underground gasification furnace, raw gas by underground gasification furnace output is expelled to circle synthesis after coal gas pretreatment unit and low temperature washing device for methanol purification, in the raw gas of the discharge after this purification, mainly contain hydrogen and carbon monoxide, can contain a small amount of carbon dioxide.In circle synthesis, can complete the production of methane, methyl alcohol, dimethyl ether or alkene.
Step (s5): enter oepration at full load by adjusting air separation unit, to adjust underground gasification furnace oepration at full load, and adjust coal gas pretreatment unit, low temperature washing device for methanol and circle synthesis and carry out oepration at full load.Wherein, when air separation unit carries out oepration at full load, its load is 70%-100%; When underground gasification furnace carries out oepration at full load, its total load is 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%; When circle synthesis carries out oepration at full load, its load is 70%-100%.
To sum up, in the present embodiment, in the process being executed by step (s1) to step (s3), the total load of underground gasification furnace is increased to 50% gradually, and after step (s4) executes, the total load of underground gasification furnace is increased to gradually in the scope of 50%-70%, and keep stable operation.In execution step (s5), the total load of underground gasification furnace is increased in the scope of 70%-100%.In the process that the total load of underground gasification furnace improves gradually, progressively improve 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 a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any modification of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.

Claims (14)

1. a starting method for underground gasification furnace and ground corollary system, comprises as follows step successively:
(s1) to underground gasification furnace injected gas agent the coal seam of igniting;
(s2) when the amount of the corresponding oxygen of producing of minimum driving load of the oxygen expenditure amount of described underground gasification furnace and air separation unit is consistent, described air separation unit is driven, and the oxygen-enriched air of the oxygen that described air separation unit is discharged and air mixing composition is sent into described underground gasification furnace as gasifying agent;
(s3) total load of adjusting described underground gasification furnace is to assumed load, coal gas pretreatment unit and low temperature washing device for methanol are driven, and the raw gas that described underground gasification furnace is discharged is sent into described low temperature washing device for methanol after described coal gas pretreatment unit purifies;
(s4) circle synthesis is driven, and the raw gas after described low temperature washing device for methanol purifies is sent into described circle synthesis;
(s5) by adjusting described air separation unit, enter oepration at full load, to adjust described underground gasification furnace oepration at full load, and adjust described coal gas pretreatment unit, described low temperature washing device for methanol and described circle synthesis and carry out oepration at full load.
2. starting method according to claim 1, is characterized in that,
The oxygen mix of the carbon dioxide being removed by described low temperature washing device for methanol and the generation of described air separation unit is formed to carbon dioxide oxygen enrichment;
Described carbon dioxide oxygen enrichment is sent into described underground gasification furnace as gasifying agent.
3. starting method according to claim 2, is characterized in that,
Described in described carbon dioxide oxygen enrichment, the volumetric concentration of oxygen is 55%-80%.
4. starting method according to claim 1, is characterized in that,
The described minimum driving load of described air separation unit is 30%.
5. starting method according to claim 1, is characterized in that,
In described step (s2),
Maintain the load of described air separation unit in 30%-70% scope.
6. starting method according to claim 1, is characterized in that,
In described step (s3): in the scope of described assumed load 30%-50%.
7. starting method according to claim 6, is characterized in that,
By adjusting the interior amount with adjusting the gasifying agent that injects described underground gasification furnace of scope of load to 30%-50% of described air separation unit, the total load of described underground gasification furnace is adjusted to described assumed load.
8. starting method according to claim 1, is characterized in that,
In described step (s3) afterwards and carry out described step (s4) before, by improving the load of described air separation unit and adjusting the amount of described underground gasification furnace injected gas agent, maintain the total load of described underground gasification furnace in 50%-70% scope.
9. starting method according to claim 1, is characterized in that,
When described air separation unit carries out oepration at full load, it is loaded in 70%-100% scope;
When described underground gasification furnace carries out oepration at full load, its total load is in 70%-100% scope;
When described coal gas pretreatment unit, described low temperature washing device for methanol and described circle synthesis carry out oepration at full load, it is loaded respectively in 70%-100% scope.
10. starting method according to claim 1, is characterized in that,
Before described coal gas pretreatment unit is driven, by part or whole raw gas of being discharged by described underground gasification furnace send into torch burning.
11. starting methods according to claim 1, is characterized 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 in described low-temperature rectisol is steam turbine formula compressor.
12. starting methods according to claim 11, is characterized in that,
Utilize steam turbine formula compressor described in steam drive part or whole that boiler produces.
13. starting methods according to claim 12, is characterized in that,
The steam of the oxygen that the carbon dioxide being removed by described low temperature washing device for methanol, described air separation unit are generated and the part being produced by described boiler is sent into described underground gasification furnace as gasifying agent.
14. starting methods according to claim 12, is characterized in that,
Before described coal gas pretreatment unit is driven, using part or whole raw gas of being discharged by described underground gasification furnace as mixing fuel burning, send into described boiler.
CN201310717501.7A 2013-12-23 2013-12-23 Underground gasification furnace and the starting method of ground corollary system Active CN103711471B (en)

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CN107165613A (en) * 2017-07-07 2017-09-15 新疆国利衡清洁能源科技有限公司 A kind of underground coal gasification(UCG) mine formula gasification furnace safe-guard system and implementation

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