CN104100366B - The System and method for that a kind of low concentration coal-bed gas is purified, generate electricity and compress/liquefy - Google Patents
The System and method for that a kind of low concentration coal-bed gas is purified, generate electricity and compress/liquefy Download PDFInfo
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- CN104100366B CN104100366B CN201410253144.8A CN201410253144A CN104100366B CN 104100366 B CN104100366 B CN 104100366B CN 201410253144 A CN201410253144 A CN 201410253144A CN 104100366 B CN104100366 B CN 104100366B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/30—Use of alternative fuels, e.g. biofuels
Abstract
The invention discloses the System and method for that a kind of low concentration coal-bed gas is purified, generated electricity and compress/liquefy, it is by monitoring the concentration of coal-seam gas, and whether determine is worth recycling.If not emptying, if so, purify to it, the gas after purification is input to natural gas transmission pipe, for resident, or compression/liquefaction, as clean automobile fuel.For concentration higher than 10% coal-seam gas, by controlling purification parameter, make in the waste gas after purifying that coal-seam gas concentration is between 5%-10%, the raw material as gas internal-combustion engine generates electricity, for gas purification and compression/liquefaction provide power, the tail gas of generating is then for gas purification provides heat; And for concentration lower than the gas of 5%, then pass through adjustment purification parameter, make purification rate reach the highest, first the gas after purification generate electricity, and residual gas carries out compressing/liquefying, and waste gas is then emptying.Present invention achieves and low concentration coal-bed gas is fully utilized efficiently, and energy-saving and emission-reduction.
Description
[technical field]
The present invention relates to coal-seam gas recycling, petrochemical industry, power domain, particularly a kind of low concentration coal-bed gas purification, the System and method for generating electricity and compress/liquefy.
[background technique]
The comprehensive mining of coal-seam gas and utilization have three objects, are first the safety in order to ensure coal mining, because the coal-seam gas in mine is the biggest threat of mine safety; Next is environmental protection, because the main component of coal-seam gas is methane, the greenhouse effect of methane are more than 20 times of carbon dioxide; 3rd is using energy source, because hydrocarbon gas contains large energy in coal-seam gas.At present, the exploitation of coal-seam gas has two kinds, and a kind of is punched to bleed before the exploitation of coal above every layer, this coal-seam gas concentration is more than 90%, this high concentration coal-seam gas is developed at present, mostly flow to resident by natural gas line and use, or generating uses; Second method is bled from the boring of the goaf in colliery, and this coal-seam gas change in concentration scope is large, and when just having started to extract, its gas concentration can reach more than 30%, but along with the passing of the time of extraction, its concentration progressively declines, even below 5%.In the coal-seam gas that second method extracts, coal-seam gas more than 30% concentration is mainly used in generating, and has obtained good exploitation; Coal-seam gas within the scope of 5%-30% then part be used for generating, suitable one owing to there being the danger of blast, utilization power is not too optimistic; The coal-seam gas of the gas of less than 5% because concentration is higher, but can not direct combustion power generation, can only as combustion-supporting gas, some collieries are even directly emptying, cause severe air to pollute, if can purify, this part gas has and larger utilizes space.From colliery discharge the third coal-seam gas be ventilation release about 1%, even lower super low concentration coal-seam gas, this gas is substantially directly emptying, or as combustion-supporting gas, or high-temperature heating is carried out to it, is carried out the comprehensive utilization of waste heat by low concentration gas oxidation at high temperature.In fact, for the coal-seam gas of more than 30%, adopting generating is not a kind of Land use systems efficiently, and on the one hand, disposable input is very large, and because tolerance cannot ensure constant, in most cases, electric motor power cannot fully be run; On the other hand, the value of gas generating itself is not so good as used as automotive fuel, or occupies domestic gas.Therefore, if can be purified, as automotive fuel, or occupy domestic gas, its value is higher.And for the coal-seam gas of super low concentration, the coal-seam gas of discharging due to this mode reaches 80% of the coal-seam gas of discharging in coal mine, directly emptying, and its environmental pollution is still very serious; Adopt high-temperature decomposition to utilize method, disposable input is very large, this China exist a lot of in, small coal mines is difficult to realize; As combustion-supporting gas, then colliery, edge is difficult to realize.
At present, the purification of coal-seam gas mainly contains Deep Cooling Method, film separating method and pressure swing adsorption method.Deep Cooling Method energy ezpenditure is comparatively large, and general is separated often kind of component gas for needs, and larger occasion, adopt less in the comprehensive utilization of coal-seam gas; Film separating method research is more, but at present due to poor selectivity, speed is slow, maintenance cost is high, does not obtain ripe application; Transformation method utilizes the strong adsorptivity of the material for gaseous such as active carbon, and low absorbability during low-voltage high-temperature is purified to coal-seam gas, this method is the method for main employing at present, but due to the easy safety problem such as explosion caused in heating process, and its purification rate is also not high enough, generally can only bring up to about 30% from 20%, more to improve, then need by repeatedly purifying.In addition, this method also needs special filtrating equipment to filter the dust in coal-seam gas, and denitrogenate, deoxygenation also needs to carry out in two steps, therefore, efficiency is relatively low, and cost is still higher.
[summary of the invention]
The object of the invention is to for deficiency of the prior art, provide the System and method for that a kind of low concentration coal-bed gas is purified, generated electricity and compress/liquefy.
For achieving the above object, the present invention adopts following technological scheme:
The system that a kind of low concentration coal-bed gas is purified, generate electricity and compress/liquefy, comprise process control machine, three-way magnetic valve, the first suction booster, the first coal-seam gas purification system, the first coal-seam gas on-line detecting system, the second coal-seam gas on-line detecting system, coal-seam gas compression/liquefaction system, compression/liquefied gas tank, first flow controller, the second suction booster, second amount controller, stabilized pressure pump, gas internal-combustion engine power generation system, transformer substation system, electric energy quality monitoring system and communications system, wherein, low concentration coal-bed gas refer to combustable gas concentration lower than 60% coal-seam gas, three-way magnetic valve is provided with coal-seam gas entrance, coal-seam gas outlet and burning emptying outlet for coal-seam gas, the entrance of coal-seam gas outlet connection first suction booster of three-way magnetic valve, first supercharging delivery side of pump connects the entrance of the first coal-seam gas purification system, the outlet of the first coal-seam gas purification system is divided into two-way, be connected with the entrance of the first coal-seam gas on-line detecting system with the second coal-seam gas on-line detecting system respectively, the outlet of the first coal-seam gas on-line detecting system connects the entrance of gas internal-combustion engine power generation system, the outlet of the second coal-seam gas on-line detecting system is divided into two-way, one tunnel compresses with coal-seam gas/and the first entrance of liquefaction system is connected, one tunnel is connected with the entrance of first flow controller, the outlet of coal-seam gas compression/liquefaction system connects the entrance of compression/liquefied gas tank, the outlet of first flow controller connects the coal-seam gas entrance of stabilized pressure pump,
Second suction booster is provided with air inlet, second supercharging delivery side of pump connects the entrance of second amount controller, the outlet of second amount controller connects the air inlet of stabilized pressure pump, voltage stabilizing delivery side of pump connects the entrance of gas internal-combustion engine power generation system, and the waste gas residual heat of gas internal-combustion engine power generation system is used for providing heat energy for the first coal-seam gas purification system; And internal combustion engine power generating system is connected with transformer substation system, transformer substation system is connected with electric energy quality monitoring system;
Process control machine is used for controlling three-way magnetic valve, the first suction booster, the first coal-seam gas purification system, the second coal-seam gas on-line detecting system, first flow controller, the second suction booster, second amount controller, stabilized pressure pump, gas internal-combustion engine power generation system, transformer substation system, electric energy quality monitoring system and communications system; First coal-seam gas on-line detecting system and the second coal-seam gas on-line detecting system are used for component and the concentration thereof of on-line monitoring coal-seam gas.
The present invention improves further and is: also comprise flowmeter and concentration measuring apparatus, it is separately positioned on the pipeline of the entrance of coal-seam gas outlet connection first suction booster of three-way magnetic valve, for flow and the concentration of on-line monitoring coal-seam gas, and the signal output part of flowmeter and concentration measuring apparatus is connected with process control machine.
The method that low concentration coal-bed gas is purified, generate electricity and compress/liquefy, the system that the method is purified based on above-mentioned a kind of low concentration coal-bed gas, generated electricity and compress/liquefy, comprises the following steps:
1) coal-seam gas flows through after three-way magnetic valve through the first suction booster supercharging, again through the first coal-seam gas purification system, to form combustable gas concentration be the dustless coal-seam gas of high concentration of 60%-95% and combustable gas concentration is the waste gas of 5%-10%, wherein, waste gas is by entering gas internal-combustion engine power generation system after the first coal-seam gas on-line detecting system, the dustless coal-seam gas of high concentration enters the second coal-seam gas on-line detecting system and is divided into two-way, lead up to after coal-seam gas compression/liquefaction system and enter compression/liquefied gas tank, separately lead up to after first flow controller and enter stabilized pressure pump;
2) air is after the second suction booster supercharging, enters stabilized pressure pump by second amount controller;
3) process control machine is respectively to step 1) and step 2) in three-way magnetic valve, the first suction booster, the first coal-seam gas purification system, the second coal-seam gas on-line detecting system, first flow controller, the second suction booster, second amount controller and stabilized pressure pump control, after the dustless coal-seam gas of high concentration and air are mixed in stabilized pressure pump, export voltage stabilizing combustible gas;
4) voltage stabilizing combustible gas enters gas internal-combustion engine power generation system and generates electricity, and electric energy quality monitoring system is entered after transformer substation system transformation, electric energy quality monitoring system exports conventional available electrical energy, simultaneously, gas internal-combustion engine power generation system is used for providing power for the first coal-seam gas purification system and coal-seam gas compression/liquefaction system, the waste gas residual heat that gas internal-combustion engine power generation system produces provides heat energy for the first coal-seam gas purification system, wherein, combustion motor power generation system, transformer substation system and electric energy quality monitoring system control process control machine respectively.
The present invention improves further and is: if the coal-seam gas in compression/liquefied gas tank is liquid, then liquid level warning line is no more than 80% of compression/liquefied gas tank degree of depth, if coal-seam gas is gaseous state in compression/liquefied gas tank, then pressure warning line is no more than 80% of compression/liquefied gas tank pressure admissible value, when the liquefaction coalbed liquid level in compression/liquefied gas tank or pressure exceed warning line setting value, by communications system apprizing system caretaker and Surveillance center, if point out full, then by the air feed of three-way magnetic valve cutting system, and it is emptying coal-seam gas to be burnt.
The present invention improves further and is: prompting compression/liquefied gas tank has been full of the threshold value that in finger pressure contracting/liquefied gas tank, liquid level sets higher than some users, this threshold value is the 80%-95% of the compression/liquefied gas tank degree of depth, or certain pressure threshold that compression/liquefied gas tank internal air pressure sets higher than user, this pressure threshold is at the 85%-90% of compression/liquefied gas tank pressure admissible value.
The system that a kind of low concentration coal-bed gas is purified, generate electricity and compress/liquefy, comprise process control machine, three-way magnetic valve, the first suction booster, the first coal-seam gas purification system, the second coal-seam gas purification system, the first coal-seam gas on-line detecting system, the second coal-seam gas on-line detecting system, coal-seam gas compression/liquefaction system, compression/liquefied gas tank, first flow controller, the second suction booster, second amount controller, stabilized pressure pump, gas internal-combustion engine power generation system, transformer substation system, electric energy quality monitoring system and communications system, wherein, low concentration coal-bed gas refer to combustable gas concentration lower than 60% coal-seam gas, three-way magnetic valve is provided with coal-seam gas entrance, coal-seam gas outlet and burning emptying outlet for coal-seam gas, the entrance of coal-seam gas outlet connection first suction booster of three-way magnetic valve, first supercharging delivery side of pump connects the entrance of the first coal-seam gas purification system, the outlet of the first coal-seam gas purification system is divided into two-way, be connected with the entrance of the first coal-seam gas on-line detecting system with the second coal-seam gas purification system respectively, first coal-seam gas on-line detecting system is provided with exhaust gas evacuation outlet, on the pipeline that the outlet that second coal-seam gas on-line detecting system is arranged on the first coal-seam gas purification system is connected with the entrance of the second coal-seam gas purification system, the outlet of the second coal-seam gas purification system is divided into three tunnels, one tunnel is connected with the entrance of gas internal-combustion engine power generation system, one tunnel compresses with coal-seam gas/and the first entrance of liquefaction system is connected, one tunnel is connected with the entrance of first flow controller, the outlet of coal-seam gas compression/liquefaction system connects the entrance of compression/liquefied gas tank, the outlet of first flow controller connects the coal-seam gas entrance of stabilized pressure pump,
Second suction booster is provided with air inlet, second supercharging delivery side of pump connects the entrance of second amount controller, the outlet of second amount controller connects the air inlet of stabilized pressure pump, voltage stabilizing delivery side of pump connects the entrance of gas internal-combustion engine power generation system, and the waste gas residual heat of gas internal-combustion engine power generation system is used for providing heat energy for the first coal-seam gas purification system and the second coal-seam gas purification system; And internal combustion engine power generating system is connected with transformer substation system, transformer substation system is connected with electric energy quality monitoring system;
Process control machine is used for controlling three-way magnetic valve, the first suction booster, the first coal-seam gas purification system, the second coal-seam gas purification system, the second coal-seam gas on-line detecting system, first flow controller, the second suction booster, second amount controller, stabilized pressure pump, gas internal-combustion engine power generation system, transformer substation system, electric energy quality monitoring system and communications system; First coal-seam gas on-line detecting system and the second coal-seam gas on-line detecting system are used for component and the concentration thereof of on-line monitoring coal-seam gas.
The present invention improves further and is: also comprise flowmeter and concentration measuring apparatus, it is separately positioned on the pipeline of the entrance of coal-seam gas outlet connection first suction booster of three-way magnetic valve, for flow and the concentration of on-line monitoring coal-seam gas, and the signal output part of flowmeter and concentration measuring apparatus is connected with process control machine.
The method that low concentration coal-bed gas is purified, generate electricity and compress/liquefy, the system that the method is purified based on above-mentioned a kind of low concentration coal-bed gas, generated electricity and compress/liquefy, comprises the following steps:
1) coal-seam gas flows through after three-way magnetic valve through the first suction booster supercharging, again through the first coal-seam gas purification system, form the one-level purification waste gas that dustless coal-seam gas and combustable gas concentration are less than 0.1%, wherein, one-level purification waste gas is by emptying after the first coal-seam gas on-line detecting system, dustless coal-seam gas is by forming the secondary purification waste gas that the dustless coal-seam gas of high concentration that combustable gas concentration is 60%-95% and combustable gas concentration are 5%-10% after the second coal-seam gas purification system, secondary purification waste gas enters gas internal-combustion engine power generation system, the dustless coal-seam gas of high concentration is divided into two-way, lead up to after coal-seam gas compression/liquefaction system and enter compression/liquefied gas tank, separately lead up to after first flow controller and enter stabilized pressure pump,
2) air is after the second suction booster supercharging, enters stabilized pressure pump by second amount controller;
3) process control machine is respectively to step 1) and step 2) in three-way magnetic valve, the first suction booster, the first coal-seam gas purification system, the second coal-seam gas purification system, the second coal-seam gas on-line detecting system, first flow controller, the second suction booster, second amount controller and stabilized pressure pump control, after the dustless coal-seam gas of high concentration and air are mixed in stabilized pressure pump, export voltage stabilizing combustible gas;
4) voltage stabilizing combustible gas enters gas internal-combustion engine power generation system and generates electricity, and electric energy quality monitoring system is entered after transformer substation system transformation, electric energy quality monitoring system exports conventional available electrical energy, simultaneously, gas internal-combustion engine power generation system is used for being the first coal-seam gas purification system, second coal-seam gas purification system and coal-seam gas compression/liquefaction system provide power, the waste gas residual heat that gas internal-combustion engine power generation system produces provides heat energy for the first coal-seam gas purification system and the second coal-seam gas purification system, wherein, process control machine is combustion motor power generation system respectively, transformer substation system and electric energy quality monitoring system control.
The present invention improves further and is: if the coal-seam gas in compression/liquefied gas tank is liquid, then liquid level warning line is no more than 80% of compression/liquefied gas tank degree of depth, if coal-seam gas is gaseous state in compression/liquefied gas tank, then pressure warning line is no more than 80% of compression/liquefied gas tank pressure admissible value, when the liquefaction coalbed liquid level in compression/liquefied gas tank or pressure exceed warning line setting value, by communications system apprizing system caretaker and Surveillance center, if point out full, then by the air feed of three-way magnetic valve cutting system, and it is emptying coal-seam gas to be burnt.
The present invention improves further and is: prompting compression/liquefied gas tank has been full of the threshold value that in finger pressure contracting/liquefied gas tank, liquid level sets higher than some users, this threshold value is the 80%-95% of the compression/liquefied gas tank degree of depth, or certain pressure threshold that compression/liquefied gas tank internal air pressure sets higher than user, this pressure threshold is at the 85%-90% of compression/liquefied gas tank pressure admissible value.
Compared with prior art, the present invention has following advantage:
First the present invention monitors the concentration of coal-seam gas; if concentration is too low, is not worth, then shuts down; coal-seam gas is directly emptying; if concentration value shows that it is worth developing, then utilize mineral oil, or vegetable oil; or waste oil is to the high-dissolvability of hydrocarbon gas; and the poor solubility opposite sex under different air pressure and temperature conditions, the transformation realizing coal-seam gas is purified and filtration with alternating temperature, or employing cloth bag method and pressure swing adsorption method carry out dedusting and purification to coal-seam gas.Gas after purifying is input to natural gas transmission pipe, or local pipe special, for resident, or the gas after purifying is compressed/liquefied, as automobile clean fuel.For concentration higher than 10% coal-seam gas, by controlling purification parameter, make purify after waste gas in coal-seam gas concentration between 5%-10%, raw material as gas internal-combustion engine generates electricity, for gas purification provides power with compressing and liquefying, the tail gas of internal-combustion engine and cooling water then for gas purification provides heat, the gas compression/liquefaction after purification, for resident, or be used as clean automobile fuel.If after primary purification, concentration is inadequate, then carry out secondary purification, until the gas concentration after purifying meets the demands.If the exhausted air quantity after purifying is not enough to meet combustion gas needs in combustion gas, then by flow dontroller, the gas IC engine supply after Partial purification is used; And for concentration lower than 5% super low concentration gas, if lower than 0.1%, then directly emptying, do not purify, if higher than 0.1%, then by adjustment purification parameter, make purification rate reach the highest, waste gas is directly emptying, and the gas after purification carries out secondary purification, the waste gas of secondary purification is used for generating, and the gas after purification carries out compressing/liquefying.If the gas concentration after secondary purification is still lower than 10%, and tolerance foot, then the purification rate modulation of secondary purification is the highest, and waste gas is still directly emptying, and the gas after purification carries out three times and purifies, gas after purifying for three times, if cannot meet the demands, then carry out the 4th time and purify, until the gas concentration after purifying meets the demands, if the exhausted air quantity after purifying is not enough to meet combustion gas needs in combustion gas, then by flow dontroller, the gas IC engine supply after Partial purification is used.
In sum, the present invention low concentration coal-bed gas convert to easy to use, be convenient to the electric energy that transmits and pressurized gas or liquid gas, for resident, or be used as automotive fuel, finally realize efficiently, low concentration coal-bed gas fully utilizes, and energy-saving and emission-reduction.
[accompanying drawing explanation]
Fig. 1 (a) is that more than 10% coal-seam gas is purified, generated electricity and compress and liquefy system construction drawing;
Fig. 1 (b) is that less than 10% coal-seam gas is purified, generated electricity and compress and liquefy system construction drawing;
Fig. 2 (a) is the pressure and temperature varying purifying plant structural drawing of gas utilization Oil solvent;
Fig. 2 (b) is gas utilization cloth bag method, pressure swing adsorption method carries out the structure drawing of device of purifying;
Fig. 3 (a) coal-seam gas is purified and the main program block diagram compressed;
The purification control flow chart of the above coal-seam gas of Fig. 3 (b) 10% concentration;
The purification schemes figure of the above coal-seam gas of 0.1% concentration below Fig. 3 (c) 10% concentration.
[embodiment]
Below in conjunction with drawings and Examples, the present invention is described in further details.
The present invention utilizes mineral oil, or vegetable oil, or waste oil is to the high-dissolvability of hydrocarbon gas, and the poor solubility opposite sex under different air pressure and temperature conditions, realize purification and the filtration of gas in coal-seam gas, or adopt cloth bag method and pressure swing adsorption method to carry out dedusting and purification to coal-seam gas, gas after purifying is compressed/liquefied, as clean automobile fuel, or the gas after purifying is input to natural gas transmission pipe, for resident, or input local pipeline, for local resident, or directly for internal-combustion engine for system provides power, for concentration higher than 10% coal-seam gas, by controlling purification parameter, make purify after waste gas in coal-seam gas concentration between 5%-10%, raw material as gas internal-combustion engine generates electricity, for gas purification provides power with compressing and liquefying, the using waste heat from tail gas of generating, cylinder sleeve of engine cooling water heat, and the heat that gas compression sheds is then for gas purification provides heat, and for concentration lower than the gas of 5%, then pass through adjustment purification parameter, make purification rate reach the highest, the gas after purification carries out secondary purification, and waste gas is then emptying, and the waste gas in secondary purification process generates electricity, and the gas after purification carries out compressing/liquefying.
Wherein, coal-seam gas adopts mineral oil, or vegetable oil, or waste oil is when purifying, be utilize mineral oil or vegetable oil high to hydrocarbon gas solubility under low temperature, high-pressure situations, and under low pressure, high-temperature condition, characteristic that solubility reduces is carried out filtering and is purified.When coal-seam gas carries out single purification, can mineral oil be adopted, or vegetable oil, or waste oil carries out dedusting and purification, and cloth bag method and pressure swing adsorption method also can be adopted to carry out dedusting and purification; If repeatedly purify, only mineral oil can be adopted, or vegetable oil, or waste oil carries out repeatedly dedusting and purification, also can only adopt cloth bag method and pressure swing adsorption method to carry out dedusting and purification, two kinds of methods can also be adopted to carry out mixing dust removing and purification.
Gas internal-combustion engine is the waste gas after purifying by the above coal-seam gas of 10% concentration, or the following coal-seam gas of 10% concentration purify after coal-seam gas carry out generating electricity as raw material, gas purifying device required drive derives from gas internal-combustion engine, the heat that the using waste heat from tail gas of required origin of heat combustion gas in combustion gas, cylinder sleeve of engine cooling water heat and gas compression/liquefaction shed, the compression/liquefaction plant required drive of gas also derives from gas internal-combustion engine.
Coal-seam gas before purifying and after purifying all adopts methane transducer to monitor, for initial concentration higher than 10% coal-seam gas, by controlling purification parameter, make purify after waste gas in coal-seam gas concentration between 5%-10%, raw material as gas internal-combustion engine generates electricity, for gas purification provides power with compressing and liquefying, the tail gas of generating is then for gas purification provides heat, and the coal-seam gas after purification is then by according to its concentration with purify and require to determine the need of carrying out secondary purification; And for concentration lower than 5% gas, then by adjustment purification parameter, purification rate is made to reach the highest, exhaust gas evacuation, coal-seam gas concentration is wherein below 0.1%, gas after purification carries out secondary purification, if secondary purification does not still reach more than 10%, then according to the mode parameters that first time purifies, and carry out three purifications, by that analogy, until the gas concentration after purifying reaches more than 10%, then purify by coal-seam gas more than 10% concentration.
System occurs that the abnormal coal-seam gas concentration referred in air rises too fast, excessive concentration, and this shows have coal-seam gas to reveal; The air pressure of compression coal-seam gas gas tank, the liquid level of liquid level coal-seam gas has reached the warning line of user's setting, and liquefied gas tank is about to be full of; Coal-seam gas gas tank temperature is too high; Generator set temperature is too high, there is exception, need maintenance, report to the police and refer to that system shows above-mentioned abnormal beacon signal on a display screen, send voice prompt, and send warning message note to system manager, if there is coal-seam gas to reveal, or gas internal-combustion engine generator set temperature is too high, then closed the air feed of coal-seam gas generating and the reclaiming system that compress/liquefies by three-way magnetic valve, and it is emptying coal-seam gas to be burnt.
Wherein, pressure warning line in pressurized gas gas tank, the liquid level warning line in liquefied coal bed gas tank can be set by the user, but pressure warning line can not exceed 80% of gas tank tolerance limit, liquid level warning line can not exceed 80% of the gas tank degree of depth, and pressure reaches warning line, or liquid level just reaches warning line, but also underfill, a now note apprizing system caretaker, and Surveillance center, system continues to run; Compression coal-seam gas gas tank is full, pressure in expression tank reaches admissible value and obtains 85%-90%, this value is set by the user, if the liquid level test result prompting gas tank in liquefied coal bed gas tank is full, its threshold value can be set by the user in 80% to 95% scope of the gas tank degree of depth; Coal-seam gas power generation system temperature is too high refers to that its temperature is higher than certain threshold value, and this threshold value is generally no more than 15% of adopted generator set normal temperature; The temperature of compression coal seam gas tank is too high, refers to that this temperature is higher than 45 DEG C; Gas density in systematic environment air is too high, and refer to that in air, gas density is higher than certain threshold value, this threshold value can be determined by user, but concentration of volume percent is no more than 4.5%; The decision threshold of the gas density rate of climb also can be set by the user, but the concentration of volume percent rate of climb can not lower than 0.1%/minute, can not higher than 1%/minute.
Purification parameter refer to promoting or transferring to economize on coal in layer gas purifying plant oil in gas dissolution cylinder liquid level and degassing cylinder in oily liquid level, and air pressure in degassing cylinder realizes, need to improve purification rate, then by increasing the power of oil pump, part oil suction in degassing cylinder in coal-seam gas purifying plant is dissolved in cylinder, promote and dissolve liquid level in cylinder, reduce liquid level in degassing cylinder, and by increasing the power of vacuum pump, reduce the air pressure in degassing cylinder, otherwise, reduce the power of oil pump, reduce and dissolve liquid level in cylinder, increase liquid level in degassing cylinder, reduce vacuum pump power, increase the air pressure in degassing cylinder.To ask purify after gas concentration inject general natural gas line, or compression/liquefaction, then need to carry out multistage purification, until coal-seam gas concentration reaches more than 90%; If the gas after purifying is used to local resident by Cemented filling, be then purified to more than 30%, the method for purification of every one-level, the one-level with more than 10% concentration coal-seam gas is purified identical.
Glass tube is had bottom degassing cylinder in coal-seam gas purifying plant, glass tube is vertically placed and is connected with degassing cylinder, lid is had bottom it, water is larger than oil due to proportion, will remain in glass tube in degassing cylinder, and the dust in coal-seam gas is also because proportion is larger than oil, when concentration buildup to a certain extent after, remain in glass jar, user by the water level in observation glass tube, and discharges water in degassing cylinder and dust and water, the oily residue formed by uncap; Degassing cylinder top is heat-exchange device, and the oil droplet in dissolving cylinder is on the inwall of this heat-exchange device, and exhaust gases of internal combustion engines blows on the outer wall of this sink, thus heats oil, the gas in oil is easily departed from from oil, is extracted out by vacuum pump.
Heat-exchange device can be single-stage, also can be multistage, gas internal-combustion engine tail gas only used by the heat-exchange device of single-stage, or the gas that coal bed gas compressor sink is discharged, or the oil in the cooling water heat de-airing cylinder of gas internal-combustion engine, Multi-stage heat switch then can first with to have heated and degassed oily preheating to be de-gassed from dissolving the oil flowed in degassing cylinder cylinder, then heat with the cooling water of gas internal-combustion engine, again with the gas-heated that coal bed gas compressor sink is discharged, finally use gas internal-combustion engine tail gas heating.
System is monitored the waste gas that the above coal-seam gas of 10% concentration is purified, if coal-seam gas flow is enough large, maintain system works and also have residue, then unnecessary gas is purified again as virgin gas, if not, then by flow dontroller, using the coal-seam gas after part purification as raw material, for gas internal-combustion engine.
Specifically, the System and method for that a kind of low concentration coal-bed gas of the present invention is purified, generated electricity and compress/liquefy, it is made up of hardware and software two-part.
1. hardware components
System is made up of, as shown in accompanying drawing 1 (a) He (b) coal-seam gas purifying plant, gas internal-combustion engine, pressure measuring set, methane transducer, liquid level testing instrument, temperature measuring device, gas boosting pump, flow dontroller, process control machine, transformer substation system, electric energy quality monitoring system, solenoid valve, gas compression/liquefier and mobile phone signal receive-transmit system;
Coal-seam gas utilizes mineral oil, or vegetable oil, or waste oil is high to hydrocarbon gas solubility in cryogenic high pressure situation, and the characteristic that solubility reduces under low pressure and high-temperature condition carries out filtering and purify, or cloth bag method and pressure swing adsorption method carry out dedusting and purification.
As shown in accompanying drawing 2 (a), the device that gas utilization Oil solvent carries out purifying comprises gas dissolution cylinder 1, blast nozzle 2, cloth 3, degassing cylinder, vacuum pump, oil pump, the first liquid level sensor 4, second liquid level sensor 5, pressure transducer, radiator and heat exchanger 6.Glass tube is had bottom degassing cylinder in coal-seam gas purifying plant, glass tube is connected with degassing cylinder, drainage bases has lid 7, water is larger than oil due to proportion, will remain in glass tube in degassing cylinder, and the dust in coal-seam gas is also because proportion is larger than oil, when concentration buildup to a certain extent after, remain in glass jar, user by the water level in observation glass tube, and discharges water in degassing cylinder and dust and water, the oily residue formed by uncap; It is heat-exchange device in the middle part of degassing cylinder, oil droplet in dissolving cylinder is on the inwall of this heat-exchange device, and exhaust gases of internal combustion engines blows on the outer wall of this heat-exchange device, thus oil is heated, gas in oil is easily departed from from oil, extract out to gas internal-combustion engine, gas compression/liquefaction plant by vacuum pump, air delivering pipeline; Sink is used for lowering the temperature to the oil after degassed, makes it easy to dissolve coal-seam gas; Liquid level sensor is monitored the liquid level of oil in the degassing cylinder in purifying plant and dissolving cylinder; Pressure transducer is used for monitoring air pressure in degassing cylinder.
As shown in accompanying drawing 2 (b), the cloth bag method dedusting of coal-seam gas, pressure swing adsorption method purifying plant comprise feed gas compressor, adsorbing cylinder, vacuum pump and a cloth bag.Virgin gas enters adsorbing cylinder through a cloth bag after compressor compresses, and cloth bag plays the effect of dedusting.Placed oxygen, nitrogen and carbon dioxide absorber in adsorbing cylinder, virgin gas is after adsorbing cylinder absorption, and in the gas discharged, concentration improves because the content of oxygen, nitrogen and carbon dioxide reduces for the concentration of gas, thus achieves the effect of purification.After once adsorbing, vacuum pump is used for reducing the pressure in adsorbing cylinder, to get rid of by the oxygen, nitrogen and the carbon dioxide that adsorb, adsorbs purification to enter next time.The power resources of vacuum pump and feed gas compressor are in gas internal-combustion engine power generation system.
Coal-seam gas before purifying and after purifying, and the air in coal-seam gas purification, generating and compression/liquefaction system surrounding enviroment all adopts methane transducer to monitor;
Liquid level testing instrument is used for testing the liquid level in the air pressure contracting/liquefied pot of high concentration coal seam;
Temperature is used for testing temperature, the gas compressor temperature in the air pressure contracting/liquefied pot of high concentration coal seam, gas internal-combustion engine temperature;
Flow dontroller is used for controlling the flow for the coal-seam gas of gas internal-combustion engine;
Solenoid valve is used for controlling the popular of coal-seam gas;
Gas compression/liquefier be used for compress/liquefaction high concentration coal-seam gas so that its transport;
Mobile phone signal receive-transmit system is used for purifying to coal-seam gas, the operation conditions of administrative staff's reporting system of generating and compression/liquefaction system;
Process control machine is used for liquid level, liquefaction coalbed liquid level, engine temperature, compressor temperature, gas purification system pressure, the compression pressure signal of gas-monitoring concentration, oil, the algorithm of execution parameter Inspect and control, and transmits control signal;
Heat-exchange device in purifying plant can be single-stage, also can be multistage, gas internal-combustion engine tail gas only used by the heat-exchange device of single-stage, or the gas that coal bed gas compressor sink is discharged, or the oil in the cooling water heat de-airing cylinder of gas internal-combustion engine, Multi-stage heat switch then can first with to have heated and degassed oily preheating to be de-gassed from dissolving the oil flowed in degassing cylinder cylinder, then heat with the cooling water of gas internal-combustion engine, again with the gas-heated that coal bed gas compressor sink is discharged, finally use gas internal-combustion engine tail gas heating.
1. software section
Software runs in process control machine, and its function mainly comprises monitoring, the pressure measurement of coal-seam gas concentration, the Measurement & Control of flow, the control of oil pump, vacuum pump, suction booster and stabilized pressure pump, the control of gas electricity generator, the control of the quality of power supply, coal-seam gas compression control, and the transmission of signal.
First, adopt flowmeter and methane transducer to monitor coal-seam gas virgin gas, obtain relevant information.If methane concentration is more than 10% in coal-seam gas virgin gas, then be pressed into coal-seam gas purification system by suction booster, coal-seam gas purification system works under the monitoring of process control machine, gas after purification is supplied to coal-seam gas and compresses and liquefies system, high concentration coal seam air pressure is reduced in liquefied pot by this system.The waste gas that coal-seam gas purification system is purified is supplied to gas internal-combustion engine power generation system, and this system provides power for purification system and compressed liquefied gas system, and the electricity sent is transformed into conventional available electrical energy by transformer substation system.Process control machine implements electric energy quality monitoring to transformer substation system, and regulates and controls transformer substation system.If methane concentration is lower than 10% in coal-seam gas virgin gas, then the purification rate of coal-seam gas purification system is adjusted to the highest, if the gas concentration after purification is higher than 5%, then directly supplies gas internal-combustion engine power generation system and do fuel, if
1) measurement of the pressure versus flow of coal-seam gas, the measurement of coal-seam gas generator-temperature detection, level gauging, the gas density in coal-seam gas concentration and outside air is measured.
The measurement of pressure versus flow is the pressure versus flow information in order to obtain coal-seam gas, and its method is the signal that process control machine reads pressure measuring set and flowmeter, and according to certain transformation rule, converts this signal to pressure versus flow signal.These needs are changed depending on the form of read signal.If signal inherently digital pressure value and the flow value that pressure and flowmeter export, then without the need to conversion, directly read.The mode read comprises serial communication, network interface communication, wireless telecommunications and modulating pulse etc.; If what export is certain electrical signal, then also need collection and the conversion of carrying out signal.The measurement of coal-seam gas gas internal-combustion engine power generation system temperature, pressure in compression gas tank, the level gauging in liquefied gas tank, gas density in coal-seam gas concentration and outside air is measured, pressure in purification system, level gauging, its method is the same with the method for the measurement of pressure versus flow.Here be explained for pressure:
(1) signals collecting.If pressure-measuring system exports certain voltage or current signal, then process control machine is by arranging sample frequency, the sampling resolution of capture card, and starts sampling, obtains the numerical value of signal.Sample frequency, sampling resolution are depending on practical situations.If pressure transducer has good signal to noise ratio, then can select higher resolution, to obtain measurement result more accurately.Otherwise rate can arrange lower respectively, to obtain picking rate faster; If the airspeed of damp, coal-seam gas is very fast, pressure change is very fast, then the frequency of signals collecting also suitably arranges higher, with the dynamic characteristic obtained, otherwise can arrange lower, to reduce the resource that process control machine consumes in signals collecting;
(2) conversion of signal.The numerical value of the signal of the pressure-measuring system that process control machine collects, be not often force value, it and force value have certain corresponding relation, therefore need to transform.Some pressure measuring sets give conversion formula, so in process control machine, directly performs this conversion.If do not provide this conversion relation, then need to demarcate, obtain nominal data, then carry out the matching of conversion relation, finally just adopt the conversion relational expression of acquisition to change.The determination of this conversion relation adopts following least square polynomial method to realize:
B＝(H×H')
-1×H'×Y(1)
Y=[y in formula
1, y
2..., y
n] ' represent demarcate N number of sample in pressure vector; B=[b
0, b
1..., b
m] ' represent M+1 coefficient vector in M rank multinomials, M<N, and M>=1;
representative polynomial matrix, wherein x
i(i=1,2 ..., x
n) represent and y
icorresponding sampled value.So, after acquisition system of polynomials number vector B, for each image data x, formula (2) can be adopted to change.
2) control of flow dontroller
The source of the gas that flow dontroller is used for gas internal-combustion engine is inadequate, is not enough to maintain whole system and operates, and it is used as controlling purification rear coal-seam gas flow during fuel that needs add the coal-seam gas after purifying.
The flow of the coal-seam gas after purification controls as feedback signal with actual power demand, target is the normal work maintaining coal-seam gas purification, generating, compression/liquefaction system, real output can meet power demand, close this flow dontroller, if be not enough to maintain system cloud gray model, then augmented flow controller flow.This power demand according to a purifying plant power demand, coal-seam gas gas compression/liquefier power demand, the actual power demand of control system, and outside electricity consumption power demand is determined.Control algorithm can adopt pid control algorithm:
Δ＝W
S-W(3a)
In formula, C (n) is current controlled quentity controlled variable; W is present output power; W
sfor maintaining system running power demand; Δ (n), Δ (n-1) are respectively current demand power value and the difference of output power difference and previous moment; Δ (i) represents i moment demand power value and output power difference; p
p, p
iand p
dbe respectively proportional component, integral element and differentiation element coefficient in PID control, they can be obtained by pid control parameter regulating method.
3) control of suction booster and stabilized pressure pump
The controlling method of suction booster and stabilized pressure pump, the flow dontroller control algorithm of cotype (3) is just the same.
4) coal-seam gas is purified and is controlled
The main control flow chart that coal-seam gas is purified is as shown in accompanying drawing 3 (a).If coal-seam gas material concentration reaches more than 90%, then directly dedusting, then compresses/liquefies or inject natural gas line; If more than 10% concentration, then whether purify as required, if need to be purified to more than 90%, then enable the purification control program of more than 10% concentration; If concentration is more than 30%, does not need compression/liquefaction, only need generating, or inject local pipeline, local resident uses altogether, then after dedusting, and generating or injection local pipeline, if coal-seam gas concentration is between 10% 30%, only need generating, then generate electricity after dedusting, if except generating electricity except, need unnecessary electric power injection local pipeline, then proposed to more than 30%, flow in pipes.
The proposition control strategy of the above coal-seam gas of 10% concentration is as shown in accompanying drawing 3 (b).If require to purify to 90%, then purify successively, until coal-seam gas concentration reaches more than 90%, then as required, compress high concentration coal-seam gas/liquefy, or inject natural gas line, the waste gas of at every turn purifying is then for generating.The state modulator of purifying is realized by the power controlling purifying plant oil pump and vacuum pump.What first regulate is oil pump, when oil pump cannot reach requirement, then regulates vacuum pump.The method regulated is identical with the adjustment of flow dontroller.If coal-seam gas carries out compressing/liquefying after not needing to be increased to 90%, or inject natural gas line, only need be increased to 30%, be then 30% by parameter modification, then the gas purifying to more than 30% is used for the generating of other gas electricity generators, or injects local pipeline, for local resident.
The proposition control strategy of the coal-seam gas of less than 10% is as shown in accompanying drawing 3 (c).In the purification process of this gas, the first order is purified and is adjusted to the highest by purification rate, and namely in dissolving cylinder, liquid level is the highest, and in degassing cylinder, degree of vacuum is the highest.Then judge the concentration of the coal-seam gas after purifying, if be increased to more than 10%, then subsequent purification is undertaken by the above gas of 10% concentration, if be still less than 10%, then increases purification progression, until purifying gas concentration reaches more than 10%.
System is also monitored the waste gas that the above coal-seam gas of 10% concentration is purified simultaneously, if flow enough maintains system works, then unnecessary gas is purified again as virgin gas, if not, then pass through flow dontroller, using the coal-seam gas after part purification as raw material, for gas internal-combustion engine.
6) transformer substation system
At software section, transformer substation system, mainly according to the result that electric energy quality monitoring system provides, sends the instruction of regulating voltage, phase place, with the index request of satisfied output electric energy.
7) electric energy quality monitoring system
The monitoring system of the quality of power supply mainly monitors output voltage and phase place, ripple etc., and monitoring result, except assessing the quality of power supply, is used as the feedback signal regulating transformer substation system, also can monitors the fault of power generation system, transformer substation system.At software section, the present invention mainly reads the data of monitoring system, prepares for regulating the fault of transformer substation system, diagnosis transformer substation system and power generation system.
8) coal-seam gas compression/liquefaction is reclaimed and power generation dispatching
According to the demand of the flow of coal-seam gas and system power demand, process control machine determines whether that needing to carry out coal-seam gas compression/liquefaction reclaims, if coal-seam gas also has residue needed for supply system and other users local, system needs excessive gas to compress/liquefaction, then a whole set of coal-seam gas purification, generating and the reclaiming system running state that compress/liquefies are normal, otherwise, only purify, generate electricity, close coal-seam gas compression/liquefaction and reclaim.If unnecessary purification gas is for injecting natural gas line, or local gas path pipe, then purify, generating same, be injected into pipeline.
9) warning decision-making
Pressure warning line in pressurized gas gas tank, the liquid level warning line in liquefied coal bed gas tank can be set by the user, but pressure warning line can not exceed 80% of gas tank tolerance limit, liquid level warning line can not exceed 80% of the gas tank degree of depth, pressure reaches warning line, or liquid level just reaches warning line, but go back underfill, now a note apprizing system caretaker, and Surveillance center, system continues to run; Compression coal-seam gas gas tank is full, pressure in expression tank reaches admissible value and obtains 85%-90%, this value is set by the user, if the liquid level test result prompting gas tank in liquefied coal bed gas tank is full, its threshold value can be set by the user in 80% to 95% scope of the gas tank degree of depth; Coal-seam gas power generation system temperature is too high refers to that its temperature is higher than certain threshold value, and this threshold value is generally no more than 15% of adopted generator set normal temperature; The temperature of compression coal seam gas tank is too high, refers to that this temperature is higher than 45 DEG C; Gas density in systematic environment air is too high, and refer to that in air, gas density is higher than certain threshold value, this threshold value can be determined by user, but concentration of volume percent is no more than 4.5%; The decision threshold of the gas density rate of climb also can be set by the user, but the concentration of volume percent rate of climb can not lower than 0.1%/minute, can not higher than 1%/minute.
Above content is in conjunction with concrete preferred implementation further description made for the present invention; can not assert that the specific embodiment of the present invention is only limitted to this; for general technical staff of the technical field of the invention; without departing from the inventive concept of the premise; some simple deduction or replace can also be made, all should be considered as belonging to the present invention by submitted to claims determination scope of patent protection.
Claims (9)
1. a low concentration coal-bed gas is purified, generating and the method compress/liquefied, it is characterized in that, the method is purified based on a kind of low concentration coal-bed gas, generating and the system compress/liquefied, comprise process control machine, three-way magnetic valve, first suction booster, first coal-seam gas purification system, first coal-seam gas on-line detecting system, second coal-seam gas on-line detecting system, coal-seam gas compression/liquefaction system, compression/liquefied gas tank, first flow controller, second suction booster, second amount controller, stabilized pressure pump, gas internal-combustion engine power generation system, transformer substation system, electric energy quality monitoring system and communications system, wherein, low concentration coal-bed gas refer to combustable gas concentration lower than 60% coal-seam gas, three-way magnetic valve is provided with coal-seam gas entrance, coal-seam gas outlet and burning emptying outlet for coal-seam gas, the entrance of coal-seam gas outlet connection first suction booster of three-way magnetic valve, first supercharging delivery side of pump connects the entrance of the first coal-seam gas purification system, the outlet of the first coal-seam gas purification system is divided into two-way, be connected with the entrance of the first coal-seam gas on-line detecting system with the second coal-seam gas on-line detecting system respectively, the outlet of the first coal-seam gas on-line detecting system connects the entrance of gas internal-combustion engine power generation system, the outlet of the second coal-seam gas on-line detecting system is divided into two-way, one tunnel compresses with coal-seam gas/and the first entrance of liquefaction system is connected, one tunnel is connected with the entrance of first flow controller, the outlet of coal-seam gas compression/liquefaction system connects the entrance of compression/liquefied gas tank, the outlet of first flow controller connects the coal-seam gas entrance of stabilized pressure pump,
Second suction booster is provided with air inlet, second supercharging delivery side of pump connects the entrance of second amount controller, the outlet of second amount controller connects the air inlet of stabilized pressure pump, voltage stabilizing delivery side of pump connects the entrance of gas internal-combustion engine power generation system, and the waste gas residual heat of gas internal-combustion engine power generation system is used for providing heat energy for the first coal-seam gas purification system; And internal combustion engine power generating system is connected with transformer substation system, transformer substation system is connected with electric energy quality monitoring system;
Process control machine is used for controlling three-way magnetic valve, the first suction booster, the first coal-seam gas purification system, the second coal-seam gas on-line detecting system, first flow controller, the second suction booster, second amount controller, stabilized pressure pump, gas internal-combustion engine power generation system, transformer substation system, electric energy quality monitoring system and communications system; First coal-seam gas on-line detecting system and the second coal-seam gas on-line detecting system are used for component and the concentration thereof of on-line monitoring coal-seam gas;
The method comprises the following steps:
1) coal-seam gas flows through after three-way magnetic valve through the first suction booster supercharging, again through the first coal-seam gas purification system, to form combustable gas concentration be the dustless coal-seam gas of high concentration of 60%-95% and combustable gas concentration is the waste gas of 5%-10%, wherein, waste gas is by entering gas internal-combustion engine power generation system after the first coal-seam gas on-line detecting system, the dustless coal-seam gas of high concentration enters the second coal-seam gas on-line detecting system and is divided into two-way, lead up to after coal-seam gas compression/liquefaction system and enter compression/liquefied gas tank, separately lead up to after first flow controller and enter stabilized pressure pump;
2) air is after the second suction booster supercharging, enters stabilized pressure pump by second amount controller;
3) process control machine is respectively to step 1) and step 2) in three-way magnetic valve, the first suction booster, the first coal-seam gas purification system, the second coal-seam gas on-line detecting system, first flow controller, the second suction booster, second amount controller and stabilized pressure pump control, after the dustless coal-seam gas of high concentration and air are mixed in stabilized pressure pump, export voltage stabilizing combustible gas;
4) voltage stabilizing combustible gas enters gas internal-combustion engine power generation system and generates electricity, and electric energy quality monitoring system is entered after transformer substation system transformation, electric energy quality monitoring system exports conventional available electrical energy, simultaneously, gas internal-combustion engine power generation system is used for providing power for the first coal-seam gas purification system and coal-seam gas compression/liquefaction system, the waste gas residual heat that gas internal-combustion engine power generation system produces provides heat energy for the first coal-seam gas purification system, wherein, combustion motor power generation system, transformer substation system and electric energy quality monitoring system control process control machine respectively.
2. a kind of low concentration coal-bed gas as claimed in claim 1 is purified, generating and the method compress/liquefied, it is characterized in that, if the coal-seam gas in compression/liquefied gas tank is liquid, then liquid level warning line is no more than 80% of compression/liquefied gas tank degree of depth, if coal-seam gas is gaseous state in compression/liquefied gas tank, then pressure warning line is no more than 80% of compression/liquefied gas tank pressure admissible value, when the liquefaction coalbed liquid level in compression/liquefied gas tank or pressure exceed warning line setting value, by communications system apprizing system caretaker and Surveillance center, if point out full, then by the air feed of three-way magnetic valve cutting system, and it is emptying coal-seam gas to be burnt.
3. a kind of low concentration coal-bed gas purification as claimed in claim 2, the method generating electricity and compress/liquefy, it is characterized in that, prompting compression/liquefied gas tank has been full of the threshold value that in finger pressure contracting/liquefied gas tank, liquid level sets higher than some users, this threshold value is the 80%-95% of the compression/liquefied gas tank degree of depth, or certain pressure threshold that compression/liquefied gas tank internal air pressure sets higher than user, this pressure threshold is at the 85%-90% of compression/liquefied gas tank pressure admissible value.
4. a kind of low concentration coal-bed gas purification as claimed in claim 1, the method generating electricity and compress/liquefy, it is characterized in that, this system also comprises flowmeter and concentration measuring apparatus, it is separately positioned on the pipeline of the entrance of coal-seam gas outlet connection first suction booster of three-way magnetic valve, for flow and the concentration of on-line monitoring coal-seam gas, and the signal output part of flowmeter and concentration measuring apparatus is connected with process control machine.
5. a low concentration coal-bed gas purify, generating and the system that compress/liquefies, it is characterized in that: comprise process control machine, three-way magnetic valve, the first suction booster, the first coal-seam gas purification system, the second coal-seam gas purification system, the first coal-seam gas on-line detecting system, the second coal-seam gas on-line detecting system, coal-seam gas compression/liquefaction system, compression/liquefied gas tank, first flow controller, the second suction booster, second amount controller, stabilized pressure pump, gas internal-combustion engine power generation system, transformer substation system, electric energy quality monitoring system and communications system, wherein, low concentration coal-bed gas refer to combustable gas concentration lower than 60% coal-seam gas, three-way magnetic valve is provided with coal-seam gas entrance, coal-seam gas outlet and burning emptying outlet for coal-seam gas, the entrance of coal-seam gas outlet connection first suction booster of three-way magnetic valve, first supercharging delivery side of pump connects the entrance of the first coal-seam gas purification system, the outlet of the first coal-seam gas purification system is divided into two-way, be connected with the entrance of the first coal-seam gas on-line detecting system with the second coal-seam gas purification system respectively, first coal-seam gas on-line detecting system is provided with exhaust gas evacuation outlet, on the pipeline that the outlet that second coal-seam gas on-line detecting system is arranged on the first coal-seam gas purification system is connected with the entrance of the second coal-seam gas purification system, the outlet of the second coal-seam gas purification system is divided into three tunnels, one tunnel is connected with the entrance of gas internal-combustion engine power generation system, one tunnel compresses with coal-seam gas/and the first entrance of liquefaction system is connected, one tunnel is connected with the entrance of first flow controller, the outlet of coal-seam gas compression/liquefaction system connects the entrance of compression/liquefied gas tank, the outlet of first flow controller connects the coal-seam gas entrance of stabilized pressure pump,
Second suction booster is provided with air inlet, second supercharging delivery side of pump connects the entrance of second amount controller, the outlet of second amount controller connects the air inlet of stabilized pressure pump, voltage stabilizing delivery side of pump connects the entrance of gas internal-combustion engine power generation system, and the waste gas residual heat of gas internal-combustion engine power generation system is used for providing heat energy for the first coal-seam gas purification system and the second coal-seam gas purification system; And internal combustion engine power generating system is connected with transformer substation system, transformer substation system is connected with electric energy quality monitoring system;
Process control machine is used for controlling three-way magnetic valve, the first suction booster, the first coal-seam gas purification system, the second coal-seam gas purification system, the second coal-seam gas on-line detecting system, first flow controller, the second suction booster, second amount controller, stabilized pressure pump, gas internal-combustion engine power generation system, transformer substation system, electric energy quality monitoring system and communications system; First coal-seam gas on-line detecting system and the second coal-seam gas on-line detecting system are used for component and the concentration thereof of on-line monitoring coal-seam gas.
6. a kind of low concentration coal-bed gas purification according to claim 5, the system generating electricity and compress/liquefy, it is characterized in that: also comprise flowmeter and concentration measuring apparatus, it is separately positioned on the pipeline of the entrance of coal-seam gas outlet connection first suction booster of three-way magnetic valve, for flow and the concentration of on-line monitoring coal-seam gas, and the signal output part of flowmeter and concentration measuring apparatus is connected with process control machine.
7. low concentration coal-bed gas purification, generating and the method compress/liquefied, is characterized in that, the system that the method is purified based on a kind of low concentration coal-bed gas described in claim 6 or 7, generated electricity and compress/liquefy comprises the following steps:
1) coal-seam gas flows through after three-way magnetic valve through the first suction booster supercharging, again through the first coal-seam gas purification system, form the one-level purification waste gas that dustless coal-seam gas and combustable gas concentration are less than 0.1%, wherein, one-level purification waste gas is by emptying after the first coal-seam gas on-line detecting system, dustless coal-seam gas is by forming the secondary purification waste gas that the dustless coal-seam gas of high concentration that combustable gas concentration is 60%-95% and combustable gas concentration are 5%-10% after the second coal-seam gas purification system, secondary purification waste gas enters gas internal-combustion engine power generation system, the dustless coal-seam gas of high concentration is divided into two-way, lead up to after coal-seam gas compression/liquefaction system and enter compression/liquefied gas tank, separately lead up to after first flow controller and enter stabilized pressure pump,
2) air is after the second suction booster supercharging, enters stabilized pressure pump by second amount controller;
3) process control machine is respectively to step 1) and step 2) in three-way magnetic valve, the first suction booster, the first coal-seam gas purification system, the second coal-seam gas purification system, the second coal-seam gas on-line detecting system, first flow controller, the second suction booster, second amount controller and stabilized pressure pump control, after the dustless coal-seam gas of high concentration and air are mixed in stabilized pressure pump, export voltage stabilizing combustible gas;
4) voltage stabilizing combustible gas enters gas internal-combustion engine power generation system and generates electricity, and electric energy quality monitoring system is entered after transformer substation system transformation, electric energy quality monitoring system exports conventional available electrical energy, simultaneously, gas internal-combustion engine power generation system is used for being the first coal-seam gas purification system, second coal-seam gas purification system and coal-seam gas compression/liquefaction system provide power, the waste gas residual heat that gas internal-combustion engine power generation system produces provides heat energy for the first coal-seam gas purification system and the second coal-seam gas purification system, wherein, process control machine is combustion motor power generation system respectively, transformer substation system and electric energy quality monitoring system control.
8. a kind of low concentration coal-bed gas as claimed in claim 7 is purified, generating and the method compress/liquefied, it is characterized in that, if the coal-seam gas in compression/liquefied gas tank is liquid, then liquid level warning line is no more than 80% of compression/liquefied gas tank degree of depth, if coal-seam gas is gaseous state in compression/liquefied gas tank, then pressure warning line is no more than 80% of compression/liquefied gas tank pressure admissible value, when the liquefaction coalbed liquid level in compression/liquefied gas tank or pressure exceed warning line setting value, by communications system apprizing system caretaker and Surveillance center, if point out full, then by the air feed of three-way magnetic valve cutting system, and it is emptying coal-seam gas to be burnt.
9. a kind of low concentration coal-bed gas purification as claimed in claim 8, the method generating electricity and compress/liquefy, it is characterized in that, prompting compression/liquefied gas tank has been full of the threshold value that in finger pressure contracting/liquefied gas tank, liquid level sets higher than some users, this threshold value is the 80%-95% of the compression/liquefied gas tank degree of depth, or certain pressure threshold that compression/liquefied gas tank internal air pressure sets higher than user, this pressure threshold is at the 85%-90% of compression/liquefied gas tank pressure admissible value.
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