CN104100366A - Low-concentration coal-bed gas purification, power generation and compression/liquification system and low-concentration coal-bed gas purification, power generation and compression/liquification method - Google Patents
Low-concentration coal-bed gas purification, power generation and compression/liquification system and low-concentration coal-bed gas purification, power generation and compression/liquification method Download PDFInfo
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- CN104100366A CN104100366A CN201410253144.8A CN201410253144A CN104100366A CN 104100366 A CN104100366 A CN 104100366A CN 201410253144 A CN201410253144 A CN 201410253144A CN 104100366 A CN104100366 A CN 104100366A
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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
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- 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 a low-concentration coal-bed gas purification, power generation and compression/liquification system and a low-concentration coal-bed gas purification, power generation and compression/liquification method. The method comprises the following steps: determining whether coal-bed gas is worthy of being recycled or not by virtue of monitoring the concentration of the coal-bed gas; if the coal-bed gas is not worthy of being recycled, emptying the coal-bed gas, and if the coal-bed gas is worthy of being recycled, purifying the coal-bed gas; importing the purified gas into a natural gas conveying pipe so as to be used by citizens, or compressing/liquifying the purified gas so as to serve as a clean automobile fuel. As for the coal-bed gas with the concentration higher than 10%, by virtue of controlling the purification parameter, the concentration of the coal-bed gas in exhaust gas after purification is controlled within 5%-10%, the exhaust gas after purification serves as a raw material of an internal combustion engine to realize power generation so as to provide power for gas purification and compression/liquification, and the exhaust gas after power generation supplies heat for gas purification; as for the gas with the concentration less than 5%, by virtue of regulating the purification parameter, the purification rate is maximal, the purified gas is firstly used for power generation, residual gas is compressed/liquified, and the exhaust gas is emptied. The system and the method can be used for realizing efficient comprehensive utilization of low-concentration coal-bed gas, energy conservation and emission reduction.
Description
[technical field]
The present invention relates to coal-seam gas recycling, petrochemical industry, power domain, the System and method for that particularly a kind of low concentration coal-bed gas is purified, generated electricity and compress/liquefy.
[background technique]
The comprehensive mining of coal-seam gas and utilization have three objects, are first in order to guarantee the safety of 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; The 3rd is using energy source, because hydrocarbon gas is being contained large energy in coal-seam gas.At present, the exploitation of coal-seam gas has two kinds, and a kind of is above every layer, to punch and bleed before the exploitation of coal, this coal-seam gas concentration is more than 90%, this high concentration coal seam gas is developed at present, mostly by natural gas line, flow to resident and use, or generating is used; Second method is to bleed from the goaf boring in colliery, and this coal-seam gas change in concentration scope is large, and while just starting 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% part for generating, suitable one owing to there being the danger of blast, utilize situation not too optimistic; The coal-seam gas of the gas below 5% is because concentration is higher, but direct combustion power generation, can only be as combustion-supporting gas, some collieries are even directly emptying, cause serious atmospheric pollution, if can purify, this part gas has the larger space that utilizes.The third coal-seam gas of discharging from colliery is 1% left and right that ventilation is released, even lower super low concentration coal-seam gas, this gas is substantially directly emptying, or as combustion-supporting gas, or it is carried out to high-temperature heating, by low concentration gas oxidation at high temperature, carry out the comprehensive utilization of waste heat.In fact, for more than 30% coal-seam gas, adopting generating is not a kind of mode of utilizing efficiently, and on the one hand, disposable input is very large, and because tolerance cannot guarantee constantly, in most cases, electric motor power cannot fully be moved; 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, its environmental pollution is still very serious; Adopt high-temperature decomposition to utilize method, disposable input is very large, and a lot of middle or small collieries that Zhe China exists are difficult to realize; As combustion-supporting gas, for colliery, edge, be difficult to realize.
At present, the purification of coal-seam gas mainly contains Deep Cooling Method, film separating method and pressure swing adsorption method.The consumption of Deep Cooling Method energy is larger, and general is carried out separation for needs to every kind of component gas, and larger occasion, adopts 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 materials such as active carbon to gas, and low absorbability during low-voltage high-temperature is purified to coal-seam gas, this method is the method mainly adopting 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 30% left and right from 20%, if will improve manyly, need by repeatedly purifying.In addition, this method also needs special filtrating equipment to filter the dust in coal-seam gas, denitrogenates, deoxygenation also needs to carry out in two steps, and therefore, efficiency is relatively low, and cost is still higher.
[summary of the invention]
The System and method for that provides a kind of low concentration coal-bed gas to purify, generate electricity and compress/liquefy is provided for deficiency of the prior art.
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, generated 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 refers 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 for the coal-seam gas emptying outlet of burning, the coal-seam gas outlet of three-way magnetic valve connects the entrance of the first suction booster, the 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 second coal-seam gas on-line detecting system with the first 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 is connected with the first entrance of coal-seam gas compression/liquefaction system, 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,
The second suction booster is provided with air inlet, the 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 to the first coal-seam gas purification system that heat energy is provided; 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 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; The first coal-seam gas on-line detecting system and the second coal-seam gas on-line detecting system are for component and the concentration thereof of on-line monitoring coal-seam gas.
The present invention further improves and is: also comprise flowmeter and concentration measuring apparatus, its coal-seam gas that is separately positioned on three-way magnetic valve exports on the pipeline of the entrance that connects the first suction booster, 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.
Low concentration coal-bed gas purification, the method for generating electricity and compressing/liquefying, the system that the method is purified, generated electricity and compress/liquefy based on above-mentioned a kind of low concentration coal-bed gas, comprises the following steps:
1) coal-seam gas is flowed through three-way magnetic valve by the first suction booster supercharging, again through the first coal-seam gas purification system, the waste gas that the dustless coal-seam gas of high concentration that formation combustable gas concentration is 60%-95% and combustable gas concentration are 5%-10%, wherein, waste gas enters gas internal-combustion engine power generation system after by 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, 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, output voltage stabilizing combustible gas;
4) voltage stabilizing combustible gas enters gas internal-combustion engine power generation system and generates electricity, and enter electric energy quality monitoring system after transformer substation system transformation, electric energy quality monitoring system is exported conventional available electrical energy, simultaneously, gas internal-combustion engine power generation system is used to the first coal-seam gas purification system and coal-seam gas compression/liquefaction system that power is provided, 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, control respectively by combustion motor power generation system, transformer substation system and electric energy quality monitoring system for process control machine.
The present invention further improves and is: if the coal-seam gas in compression/liquefied gas tank is liquid, 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, 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 surpass warning line setting value, by communications system apprizing system caretaker and Surveillance center, if point out full, pass through the air feed of three-way magnetic valve cutting system, and it is emptying that coal-seam gas is burnt.
The present invention further improves and is: prompting compression/liquefied gas tank has been full of the threshold value that in finger pressure contracting/liquefied gas tank, liquid level is set higher than some users, the 80%-95% that this threshold value is the compression/liquefied gas tank degree of depth, or certain pressure threshold of setting higher than user of compression/liquefied gas tank internal air pressure, 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, generated 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 refers 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 for the coal-seam gas emptying outlet of burning, the coal-seam gas outlet of three-way magnetic valve connects the entrance of the first suction booster, the 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 second coal-seam gas purification system with the first coal-seam gas on-line detecting system respectively, the first coal-seam gas on-line detecting system is provided with exhaust gas evacuation outlet, the second coal-seam gas on-line detecting system is arranged on the pipeline that the outlet of the first coal-seam gas purification system and the entrance of the second coal-seam gas purification system be connected, 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 is connected with the first entrance of coal-seam gas compression/liquefaction system, 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,
The second suction booster is provided with air inlet, the 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 to the first coal-seam gas purification system and the second coal-seam gas purification system that heat energy is provided; 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 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; The first coal-seam gas on-line detecting system and the second coal-seam gas on-line detecting system are for component and the concentration thereof of on-line monitoring coal-seam gas.
The present invention further improves and is: also comprise flowmeter and concentration measuring apparatus, its coal-seam gas that is separately positioned on three-way magnetic valve exports on the pipeline of the entrance that connects the first suction booster, 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.
Low concentration coal-bed gas purification, the method for generating electricity and compressing/liquefying, the system that the method is purified, generated electricity and compress/liquefy based on above-mentioned a kind of low concentration coal-bed gas, comprises the following steps:
1) coal-seam gas is flowed through three-way magnetic valve by 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, it is the dustless coal-seam gas of high concentration of 60%-95% and the secondary purification waste gas that combustable gas concentration is 5%-10% that dustless coal-seam gas forms combustable gas concentration after by 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, 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, output voltage stabilizing combustible gas;
4) voltage stabilizing combustible gas enters gas internal-combustion engine power generation system and generates electricity, and enter electric energy quality monitoring system after transformer substation system transformation, electric energy quality monitoring system is exported conventional available electrical energy, simultaneously, gas internal-combustion engine power generation system is used to the first coal-seam gas purification system, the 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 are controlled.
The present invention further improves and is: if the coal-seam gas in compression/liquefied gas tank is liquid, 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, 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 surpass warning line setting value, by communications system apprizing system caretaker and Surveillance center, if point out full, pass through the air feed of three-way magnetic valve cutting system, and it is emptying that coal-seam gas is burnt.
The present invention further improves and is: prompting compression/liquefied gas tank has been full of the threshold value that in finger pressure contracting/liquefied gas tank, liquid level is set higher than some users, the 80%-95% that this threshold value is the compression/liquefied gas tank degree of depth, or certain pressure threshold of setting higher than user of compression/liquefied gas tank internal air pressure, this pressure threshold is at the 85%-90% of compression/liquefied gas tank pressure admissible value.
Compared with prior art, the present invention has advantages of as follows:
First the present invention monitors the concentration of coal-seam gas; if concentration is too low, be not worth, shut down; coal-seam gas is directly emptying; if concentration value shows that it is worth developing, utilize mineral oil, or vegetable oil; or the high-dissolvability of waste oil to hydrocarbon gas; and the opposite sex of the poor solubility under different air pressure and temperature conditions, realize transformation and the alternating temperature of coal-seam gas and purify and filter, or adopt cloth bag method and pressure swing adsorption method to 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 in the waste gas after purifying 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 be for gas purification provides heat, the gas compression/liquefaction after purification, for resident, or as clean automobile fuel.If after primary purification, concentration is inadequate, carries 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, 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%, directly emptying, do not purify, if higher than 0.1%, by adjusting 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 that secondary is purified is for generating, and the gas after purification compresses/liquefies.If the gas concentration after secondary is purified is still lower than 10%, and tolerance foot, the purification rate modulation that secondary is purified 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, 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, by flow dontroller, the gas IC engine supply after Partial purification is used.
In sum, the present invention converts electric energy easy to use, to be convenient to transmission to low concentration coal-bed gas, and pressurized gas or liquid gas, for resident, or as automotive fuel, final realize efficient in, low concentration coal-bed gas fully utilizes, and energy-saving and emission-reduction.
[accompanying drawing explanation]
Fig. 1 (a) is that 10% above coal-seam gas is purified, generated electricity and compress and liquefy system construction drawing;
Fig. 1 (b) is that 10% following 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 the structure drawing of device that gas utilization cloth bag method, pressure swing adsorption method are purified;
Fig. 3 (a) coal-seam gas is purified and the main program block diagram compressing;
The purification control flow chart of the above coal-seam gas of Fig. 3 (b) 10% concentration;
The purification schemes figure of the following above coal-seam gas of 0.1% concentration of 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 the high-dissolvability of waste oil to hydrocarbon gas, and the opposite sex of the poor solubility 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, provide power for system, for concentration higher than 10% coal-seam gas, by controlling purification parameter, make in the waste gas after purifying 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 for gas purification provides heat, and for concentration lower than 5% gas, by adjusting purification parameter, make purification rate reach the highest, the gas after purification carries out secondary purification, waste gas is emptying, the waste gas in secondary purification process generates electricity, the gas after purification compresses/liquefies.
Wherein, coal-seam gas adopts mineral oil, or vegetable oil, or waste oil is when purify, be to utilize mineral oil or vegetable oil high to hydrocarbon gas solubility under low temperature, high-pressure situations, and under low pressure, high-temperature condition, the characteristic that solubility reduces is filtered with purification.Coal-seam gas is carried out single while purifying, and can adopt mineral oil, or vegetable oil, or waste oil carries out dedusting and purification, also can adopt cloth bag method and pressure swing adsorption method to carry out dedusting and purification; If repeatedly purify, can only adopt mineral oil, 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, can also adopt two kinds of methods 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 coal-seam gas of the following coal-seam gas of 10% concentration after purifying generated 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, 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 in the waste gas after purifying 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 for gas purification provides heat, and the coal-seam gas after purification is by according to its concentration with purify and require to determine whether to need to carry out secondary purification; And for concentration lower than 5% gas,, by adjusting purification parameter, make purification rate reach the highest, exhaust gas evacuation, coal-seam gas concentration is wherein below 0.1%, gas after purification carries out secondary purification, does not still reach more than 10%, according to the mode parameters of purifying for the first time if secondary is purified, and carry out three times and purify, by that analogy, until the gas concentration after purifying reaches more than 10%, then by coal-seam gas more than 10% concentration, purify.
It is too fast that system occurs extremely referring to that airborne coal-seam gas concentration rises, excessive concentration, and this shows to 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 that user sets, and liquefied gas tank is about to be full of; Coal-seam gas gas tank excess Temperature; Generator set excess Temperature, have abnormal, need maintenance, warning refers to that system, showing the above-mentioned abnormal beacon signal of screen display, sends voice prompt, and send warning message note to system manager, if there is coal-seam gas, reveal, or gas internal-combustion engine generator set excess Temperature, by three-way magnetic valve, close coal-seam gas generating and the air feed that compresses/liquefy reclaiming system, and it is emptying that coal-seam gas is 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 surpass 80% of gas tank tolerance limit, liquid level warning line can not surpass 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 operation; 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 prompting of the liquid level test result in liquefied coal bed gas tank 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 excess Temperature 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 excess Temperature of compression coal seam gas tank, refers to that this temperature is higher than 45 ℃; Gas density in systematic environment atmosphere is too high, refers to that in atmosphere, gas density is higher than certain threshold value, and 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 be lower than 0.1%/minute, can not be higher than 1%/minute.
Purification parameter refers to the promoting or transferring oily liquid level in the liquid level of oil and degassing cylinder of economizing on coal in layer gas purifying plant in gas dissolution cylinder, and air pressure in degassing cylinder is realized, need to improve purification rate, 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.After purifying if require, gas concentration is injected general natural gas line, or compression/liquefaction, needs to carry out multistage purification, until coal-seam gas concentration reaches more than 90%; If the gas after purifying flows to local resident by pipeline and uses, be purified to more than 30%, the method for purification of every one-level, purifies identical with the one-level of 10% above concentration coal-seam gas.
Glass tube is arranged at the degassing cylinder bottom in coal-seam gas purifying plant, glass tube is vertically placed and is connected with degassing cylinder, lid is arranged at its bottom, water, because proportion is larger than oil, will remain in glass tube in degassing cylinder, and dust in coal-seam gas is also because proportion is larger than oil, after concentration runs up to a certain degree, remain in glass jar, user can be by observation the water level in glass tube, and by uncap, discharge the residue of water in degassing cylinder and dust and water, oil formation; 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, thereby oil is heated, and the gas in oil is easily departed from from oil, by vacuum pump, is extracted out.
Heat-exchange device can be single-stage, also can be multistage, the heat-exchange device of single-stage is only used gas internal-combustion engine tail gas, 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 can be first with having heated and degassed oily preheating is to be de-gassed from dissolve cylinder toward the oil flowing in degassing cylinder, then with the cooling water of gas internal-combustion engine, heat, the gas-heated of discharging with coal bed gas compressor sink again, finally uses gas internal-combustion engine tail gas heating.
The waste gas that system is purified to the above coal-seam gas of 10% concentration is monitored, if coal-seam gas flow is enough large, maintain system works and also have residue, unnecessary gas is purified again as virgin gas, if not,, by flow dontroller, the coal-seam gas after a part is purified is 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 comprised of hardware and software two-part.
1. hardware components
System is comprised of 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, as accompanying drawing 1 (a) with (b);
Coal-seam gas is to utilize 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 filters with purification, 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 is purified comprises gas dissolution cylinder 1, blast nozzle 2, cloth 3, degassing cylinder, vacuum pump, oil pump, the first liquid level sensor 4, the second liquid level sensor 5, pressure transducer, radiator and heat exchanger 6.Glass tube is arranged at the degassing cylinder bottom in coal-seam gas purifying plant, glass tube is connected with degassing cylinder, lid 7 is arranged at draining bottom, water, because proportion is larger than oil, will remain in glass tube in degassing cylinder, and dust in coal-seam gas is also because proportion is larger than oil, after concentration runs up to a certain degree, remain in glass jar, user can be by observation the water level in glass tube, and by uncap, discharge the residue of water in degassing cylinder and dust and water, oil formation; Degassing cylinder middle part is heat-exchange device, 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, thereby oil is heated, gas in oil is easily departed from from oil, by vacuum pump, extracted out to gas internal-combustion engine, gas compression/liquefaction plant, air delivering pipeline; Sink is used for the oil after degassed to lower the temperature, and 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 air pressure in degassing cylinder to monitor.
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.In adsorbing cylinder, placed oxygen, nitrogen and carbon dioxide absorber, virgin gas is through after adsorbing cylinder absorption, and in the gas discharging, the concentration of gas improves because the content of oxygen, nitrogen and carbon dioxide reduces concentration, thereby has realized the effect of purifying.After once adsorbing, vacuum pump is used for reducing the pressure in adsorbing cylinder, to get rid of oxygen, nitrogen and the carbon dioxide being adsorbed, to enter absorption next time, purifies.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 atmosphere 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 is used for compressing/liquefying the coal-seam gas of high concentration, so that its transportation;
Mobile phone signal receive-transmit system is for the operation conditions of the administrative staff's reporting system to coal-seam gas purification, generating and compression/liquefaction system;
Process control machine is for liquid level, liquefaction coalbed liquid level, engine temperature, compressor temperature, gas purification system pressure, the compression pressure signal of gas-monitoring concentration, oil, and execution parameter is monitored and the algorithm of controlling, and transmits control signal;
Heat-exchange device in purifying plant can be single-stage, also can be multistage, the heat-exchange device of single-stage is only used gas internal-combustion engine tail gas, 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 can be first with having heated and degassed oily preheating is to be de-gassed from dissolve cylinder toward the oil flowing in degassing cylinder, then with the cooling water of gas internal-combustion engine, heat, the gas-heated of discharging with coal bed gas compressor sink again, finally uses gas internal-combustion engine tail gas heating.
1. software section
Software moves in process control machine, and its function mainly comprises monitoring, the pressure measurement of coal-seam gas concentration, the measurement of flow and control, 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, by suction booster, be pressed into coal-seam gas purification system, coal-seam gas purification system is worked under the monitoring of process control machine, gas after purifying is offered to coal-seam gas and compress and liquefy system, this system is reduced to high concentration coal seam air pressure in liquefied pot.The waste gas that coal-seam gas purification system is purified offers gas internal-combustion engine power generation system, and this system provides power for purification system and compressed liquefied gas system, and the electricity sending is transformed into conventional available electrical energy by transformer substation system.Process control machine is implemented electric energy quality monitoring to transformer substation system, and transformer substation system is regulated and controled.If methane concentration is lower than 10% in coal-seam gas virgin gas, the purification rate of coal-seam gas purification system is adjusted to the highlyest, if higher than 5%, directly supplying with gas internal-combustion engine power generation system, the gas concentration after purification does 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 that 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 in order to obtain the pressure versus flow information of coal-seam gas.This need to change depending on the form of read signal.If the signal itself of pressure and flowmeter output is exactly digital force value and flow value, without conversion, directly read.The mode reading comprises serial communication, network interface communication, wireless telecommunications and modulating pulse etc.; If output is certain electrical signal, also need to carry out collection and the conversion of 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 the pressure of take is explained as example:
(1) signals collecting.If pressure-measuring system is exported certain voltage or current signal, process control machine is by sample frequency, the sampling resolution of capture card are set, 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, can select higher resolution, to obtain measurement result more accurately.Otherwise rate can arrange lowlyer respectively, to obtain picking rate faster; If the airspeed of damp, coal-seam gas is very fast, pressure changes very fast, the frequency of signals collecting also suitably arrange higher, with the dynamic characteristic obtaining, otherwise can arrange lower, the resource being consumed in signals collecting to reduce process control machine;
(2) conversion of signal.The numerical value of the signal of the pressure-measuring system that process control machine collects, is not often force value, and it and force value have certain corresponding relation, therefore need to transform.On some pressure measuring sets, provide conversion formula, in process control machine, directly carried out so this conversion.If do not provide this conversion relation, need to demarcate, obtain nominal data, then carry out the matching of conversion relation, the last conversion relational expression obtaining that just adopts is changed.The following least square polynomial method of definite employing of this conversion relation is realized:
B＝(H×H')
-1×H'×Y (1)
Y=[y in formula
1, y
2..., y
n] ' pressure vector in N sample represent demarcating; B=[b
0, b
1..., b
m] ' represent M+1 coefficient vector in the multinomial of M rank, M<N, and M>=1;
representative polynomial matrix, wherein x
i(i=1,2 ..., x
n) represent and y
icorresponding sampled value.So, after obtaining system of polynomials number vector B, for each image data x, can adopt formula (2) to change.
2) control of flow dontroller
Flow dontroller is inadequate for the source of the gas of gas internal-combustion engine, is not enough to maintain whole system running, while needing to add coal-seam gas after purifying as fuel, control purify after coal-seam gas flow used.
The flow of the coal-seam gas after purification is controlled as feedback signal with actual power demand, target is the normal work that maintains 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 operation, augmented flow controller flow.This power demand is according to a purifying plant power demand, coal-seam gas gas compression/liquefier power demand, and 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)
C in formula (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 demand power value and output power difference constantly; p
p, p
iand p
dbe respectively proportional component, integral element and differentiation element coefficient in PID control, they can obtain 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%, directly dedusting, then compression/liquefaction or injection natural gas line; If more than 10% concentration, whether purify as required, if need to be purified to more than 90%, enable purification control program more than 10% concentration; If concentration more than 30%, does not need compression/liquefaction, only need generating, or inject local pipeline, local resident uses altogether,, after dedusting, generates electricity or injects local pipeline, if coal-seam gas concentration is between 10% 30%, only need generating, after dedusting, generate electricity, if except generating electricity, need to be by unnecessary electric power injection local pipeline, flow in pipes is proposed to more than 30%.
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%, purify successively, until coal-seam gas concentration reaches more than 90%, as required, high concentration coal seam gas is compressed/liquefied, or inject natural gas line, each waste gas of purifying is for generating.The parameter of purifying is controlled by controlling the power of purifying plant oil pump and vacuum pump and is realized.What first regulate is oil pump, when oil pump cannot reach requirement, then regulates vacuum pump.The method regulating is identical with the adjusting of flow dontroller.If coal-seam gas is not compressed/liquefied after not needing to be increased to 90%, or inject natural gas line, only need be increased to 30%, by parameter modification, be 30%, then the gas purifying to more than 30% is generated electricity for other gas electricity generators, or inject local pipeline, for local resident.
The proposition control strategy of the coal-seam gas below 10% is as shown in accompanying drawing 3 (c).In the purification process of this gas, the first order is purified and purification rate to be adjusted to the highest, dissolves in cylinder liquid level 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%, subsequent purification is undertaken by the above gas of 10% concentration, if be still less than 10%, increases purification progression, until purifying gas concentration reaches more than 10%.
The waste gas that system is also purified to the above coal-seam gas of 10% concentration is simultaneously monitored, if flow enough maintains system works, unnecessary gas is purified again as virgin gas, if not, pass through flow dontroller, coal-seam gas after a part is purified is as raw material, for gas internal-combustion engine.
6) transformer substation system
At software section, the result that transformer substation system mainly provides according to electric energy quality monitoring system, the instruction of sending regulating voltage, phase place, to meet the index request of output electric energy.
7) electric energy quality monitoring system
The monitoring system of the quality of power supply is mainly monitored output voltage and phase place, ripple etc., and monitoring result, except the quality of power supply is assessed, is used as the feedback signal that regulates transformer substation system, also can monitor the fault of power generation system, transformer substation system.At software section, the present invention is mainly the data that read monitoring system, for regulating the fault of transformer substation system, diagnosis transformer substation system and power generation system to prepare.
8) coal-seam gas compression/liquefaction is reclaimed and power generation dispatching
Process control machine determines whether carrying out coal-seam gas compression/liquefaction according to the demand of the flow of coal-seam gas and system power demand and reclaims, if coal-seam gas is except supply system and the required residue in addition of local other users, system need to be by unnecessary gas compression/liquefaction, a whole set of coal-seam gas purification, generating and compression/liquefaction reclaiming system running state are normal, otherwise, only purify, generate electricity, close coal-seam gas compression/liquefaction and reclaim.If unnecessary purification gas is used for injecting natural gas line, or local gas path pipe, same what purify, generate electricity, 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 surpass 80% of gas tank tolerance limit, liquid level warning line can not surpass 80% of the gas tank degree of depth, pressure reaches warning line, or liquid level just reaches warning line, but also underfill, now a note apprizing system caretaker, and Surveillance center, system continues operation; 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 prompting of the liquid level test result in liquefied coal bed gas tank 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 excess Temperature 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 excess Temperature of compression coal seam gas tank, refers to that this temperature is higher than 45 ℃; Gas density in systematic environment atmosphere is too high, refers to that in atmosphere, gas density is higher than certain threshold value, and 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 be lower than 0.1%/minute, can not be 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 only limits to this; for general technical staff of the technical field of the invention; without departing from the inventive concept of the premise; can also make some simple deduction or replace, all should be considered as belonging to the present invention and determine scope of patent protection by submitted to claims.
Claims (10)
- A low concentration coal-bed gas purify, the system of generating and compression/liquefy, 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 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 refers 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 for the coal-seam gas emptying outlet of burning, the coal-seam gas outlet of three-way magnetic valve connects the entrance of the first suction booster, the 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 second coal-seam gas on-line detecting system with the first 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 is connected with the first entrance of coal-seam gas compression/liquefaction system, 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,The second suction booster is provided with air inlet, the 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 to the first coal-seam gas purification system that heat energy is provided; 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 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; The first coal-seam gas on-line detecting system and the second coal-seam gas on-line detecting system are for component and the concentration thereof of on-line monitoring coal-seam gas.
- 2. the system that a kind of low concentration coal-bed gas according to claim 1 is purified, generated electricity and compress/liquefy, it is characterized in that: also comprise flowmeter and concentration measuring apparatus, its coal-seam gas that is separately positioned on three-way magnetic valve exports on the pipeline of the entrance that connects the first suction booster, 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.
- 3. low concentration coal-bed gas purification, the method for generating electricity and compressing/liquefying, is characterized in that, the system that a kind of low concentration coal-bed gas of the method based on described in claim 1 or 2 purified, generated electricity and compress/liquefy, comprises the following steps:1) coal-seam gas is flowed through three-way magnetic valve by the first suction booster supercharging, again through the first coal-seam gas purification system, the waste gas that the dustless coal-seam gas of high concentration that formation combustable gas concentration is 60%-95% and combustable gas concentration are 5%-10%, wherein, waste gas enters gas internal-combustion engine power generation system after by 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, 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, output voltage stabilizing combustible gas;4) voltage stabilizing combustible gas enters gas internal-combustion engine power generation system and generates electricity, and enter electric energy quality monitoring system after transformer substation system transformation, electric energy quality monitoring system is exported conventional available electrical energy, simultaneously, gas internal-combustion engine power generation system is used to the first coal-seam gas purification system and coal-seam gas compression/liquefaction system that power is provided, 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, control respectively by combustion motor power generation system, transformer substation system and electric energy quality monitoring system for process control machine.
- 4. a kind of low concentration coal-bed gas as claimed in claim 3 is purified, generating and the method for compressing/liquefying, it is characterized in that, if the coal-seam gas in compression/liquefied gas tank is liquid, 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, 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 surpass warning line setting value, by communications system apprizing system caretaker and Surveillance center, if point out full, by the air feed of three-way magnetic valve cutting system, and it is emptying that coal-seam gas is burnt.
- 5. the method that a kind of low concentration coal-bed gas as claimed in claim 4 is purified, generated 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 is set higher than some users, the 80%-95% that this threshold value is the compression/liquefied gas tank degree of depth, or certain pressure threshold of setting higher than user of compression/liquefied gas tank internal air pressure, this pressure threshold is at the 85%-90% of compression/liquefied gas tank pressure admissible value.
- A low concentration coal-bed gas purify, the system of generating and compression/liquefy, 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 refers 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 for the coal-seam gas emptying outlet of burning, the coal-seam gas outlet of three-way magnetic valve connects the entrance of the first suction booster, the 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 second coal-seam gas purification system with the first coal-seam gas on-line detecting system respectively, the first coal-seam gas on-line detecting system is provided with exhaust gas evacuation outlet, the second coal-seam gas on-line detecting system is arranged on the pipeline that the outlet of the first coal-seam gas purification system and the entrance of the second coal-seam gas purification system be connected, 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 is connected with the first entrance of coal-seam gas compression/liquefaction system, 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,The second suction booster is provided with air inlet, the 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 to the first coal-seam gas purification system and the second coal-seam gas purification system that heat energy is provided; 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 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; The first coal-seam gas on-line detecting system and the second coal-seam gas on-line detecting system are for component and the concentration thereof of on-line monitoring coal-seam gas.
- 7. the system that a kind of low concentration coal-bed gas according to claim 6 is purified, generated electricity and compress/liquefy, it is characterized in that: also comprise flowmeter and concentration measuring apparatus, its coal-seam gas that is separately positioned on three-way magnetic valve exports on the pipeline of the entrance that connects the first suction booster, 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.
- 8. low concentration coal-bed gas purification, the method for generating electricity and compressing/liquefying, is characterized in that, the system that a kind of low concentration coal-bed gas of the method based on described in claim 6 or 7 purified, generated electricity and compress/liquefy, comprises the following steps:1) coal-seam gas is flowed through three-way magnetic valve by 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, it is the dustless coal-seam gas of high concentration of 60%-95% and the secondary purification waste gas that combustable gas concentration is 5%-10% that dustless coal-seam gas forms combustable gas concentration after by 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, 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, output voltage stabilizing combustible gas;4) voltage stabilizing combustible gas enters gas internal-combustion engine power generation system and generates electricity, and enter electric energy quality monitoring system after transformer substation system transformation, electric energy quality monitoring system is exported conventional available electrical energy, simultaneously, gas internal-combustion engine power generation system is used to the first coal-seam gas purification system, the 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 are controlled.
- 9. a kind of low concentration coal-bed gas as claimed in claim 8 is purified, generating and the method for compressing/liquefying, it is characterized in that, if the coal-seam gas in compression/liquefied gas tank is liquid, 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, 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 surpass warning line setting value, by communications system apprizing system caretaker and Surveillance center, if point out full, by the air feed of three-way magnetic valve cutting system, and it is emptying that coal-seam gas is burnt.
- 10. the method that a kind of low concentration coal-bed gas as claimed in claim 9 is purified, generated 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 is set higher than some users, the 80%-95% that this threshold value is the compression/liquefied gas tank degree of depth, or certain pressure threshold of setting higher than user of compression/liquefied gas tank internal air pressure, this pressure threshold is at the 85%-90% of compression/liquefied gas tank pressure admissible value.
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| CN109139093A (en) * | 2018-10-24 | 2019-01-04 | 太原理工大学 | A kind of ground drilling low concentration coal-bed gas methane drainage and utilization project system |
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