CN102321493A - Coal bed gas separating system and process utilizing catalyst to deoxidize - Google Patents

Coal bed gas separating system and process utilizing catalyst to deoxidize Download PDF

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CN102321493A
CN102321493A CN201110135547A CN201110135547A CN102321493A CN 102321493 A CN102321493 A CN 102321493A CN 201110135547 A CN201110135547 A CN 201110135547A CN 201110135547 A CN201110135547 A CN 201110135547A CN 102321493 A CN102321493 A CN 102321493A
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coal
seam gas
gas
separation
catalyzer
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CN201110135547A
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CN102321493B (en
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魏厚瑗
丁琦洋
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北京惟泰安全设备有限公司
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Abstract

The invention belongs to the field of separation of mixed gases, and particularly relates to a system and a process for separating coal bed gas, particularly high-concentration coal bed gas with low CH4 content. The coal bed gas separating system comprises a compressing and purifying device, an O2 removing device, a purifying and deoiling device, a CH4 separating system and a product conveying system. O2 contained in the coal bed gas is fully removed by using the O2 removing device. In coal bed gas separating equipment disclosed by the invention, Fe2O3.Co3O4.MnO2 serving as a catalyst of active ingredients is coated in the O2 removing device, so that CH4 and O2 in the coal bed gas can undergo an open-flame-free reaction when being heated to about 200 DEG C. The reaction temperature is lower, so that the reaction can be completed in ordinary equipment. Meanwhile, energy consumed for heating the coal bed gas to 200 DEG C is also lower. The invention has the advantages of operation safety, energy conservation and environmental friendliness.

Description

A kind of coal-seam gas separation system and technology of utilizing the catalyzer deoxidation

Technical field

The invention belongs to the separation field of mixed gas, be specifically related to especially high density CH of a kind of coal-seam gas 4The isolating system and the technology of content coal-seam gas.

Background technology

Coal-seam gas is commonly called as " gas ", with the coal association, be stored in the unconventional Sweet natural gas in the coal seam with adsorbed state, calorific value be general coal 2-5 doubly, the staple of coal-seam gas is a methane, the Greenhouse effect of its generation are CO 221 times, be CO to the destructive force of ozonosphere 27 times.According to relevant department's estimation, national coal-mine gas accounts for whole industrial production CH to empty quantity discharged 4About 1/3 of quantity discharged.In February, 2005, Kyoto Protocol came into force, and it is increasing that China faces the pressure of " reduction of discharging ".Coal-seam gas is as a kind of non-renewable resource simultaneously, and countries in the world have begun directly to utilize or enrichment method is used.The compulsory measures that China has formulated extraction to coal-mine gas is " take out afterwards earlier and adopt "; Released the policy of " coal gas is adopted, encourages to utilize, exceed standard and punish severely altogether "; Given prominence to the critical role of gas, for road has been paved in gas mass-producing, industrialization, industrialized developing utilization as precious resources.

Coal-seam gas has two kinds of extraction modes: a kind of is ground extraction, its methane purity high (about 98%), and utility value is higher, can directly pressurize to carry out pipe network and transport the accumulating of also can directly liquefying.But be extraction under the mine that carries out coal mining production more widely.The coal-seam gas methane content that this mode extraction is come out is lower, usually between 30%-70%, in addition lower.The China's coal-mine exploitation is main purpose with the coal mining always, and the extraction of coal-seam gas (coal mine gas) is only handled and carried out from the requirement of Safety of Coal Mine Production.It is significant for the effective rate of utilization and the economic worth of expansion and raising coal-seam gas from mine coal seam gas, to separate purification methane.And China's coal-seam gas has enormous amount, place of production dispersion, individual well small scale, down-hole extraction gas concentration is low and contain characteristics such as oxygen, generally except that using, does not also have other effectively to utilize approach nearby, and emptying waste situation is very serious.If the methane in the coal-seam gas and air separation is come out and will purify after the methane liquefaction can, this just greatly facilitates transportation and utilizes.

The method that can be applicable to separation purification methane from coal-seam gas at present generally has process programs such as low-temperature liquefaction separation, transformation absorption and membrane sepn, and every kind of scheme all has characteristic and the range of application of oneself.Yet for technologies such as transformation absorption and membrane sepn; In separation process scheme, all need pressurize to virgin gas; This has obviously enlarged the explosion ratio scope of coal-seam gas; Therefore in that separating treatment mine coal seam gas is this when containing the oxygen fuel mixture, safety-problems is that all stripping technique must be considered.

According to Theory of Combustion; Inflammable gass such as methane fire in air, have the oxygen concn that fires of a minimum, and its corresponding point is called and fires stagnation point; Constituted a trilateral with the blast upper and lower limit concentration point of inflammable gas; Be commonly referred to the Coward explosion triangle, be in this explosion triangle as long as work as the mixture concentration scope, system very easily blasts.

As shown in Figure 1, wherein area I is the blast triangular space; Area I I is oxygen debt district, promptly increases oxygen (air) explosibility; Area I II promptly increases the methane explosibility for owing the methane district; Area I V is the safety zone, does not blast.At normal temperatures and pressures, the concentration range of methane and air mixed blast is 5%-15%.This scope can change with the variation of pressure and temperature, and temperature raises and pressure raises all can make the explosion ratio range extension.Because the gas density that extract out in the colliery generally within limits of explosion, is taked the high pressure flow process, Lower Explosive Limit will be reduced; There is unsafe factor; Therefore from mine coal seam gas (mixture of air and methane), separate purification methane, no matter in the starting mixt methane concentration have how high, along with the separation minimizing of methane; In system, all can pass the explosion ratio scope, this all is breakneck to any system for separating and purifying.Therefore, in the process that coal-seam gas is handled, must consider the safety-problems that possibly occur constantly, the content of control methane and air is to reach being perfectly safe of recovery process.

Chinese patent CN101104825A discloses a kind of liquefied natural gas production method of mine gas gas; The described method of this patent is at first with the oxygen separation that is contained in the coal-seam gas; Make the XPL range of coal-seam gas away from explosion triangle; Its described method of deoxidation is to adopt strong method for oxidation of catalyzer or pressure swing adsorption process to carry out deoxidation treatment, the strong oxidation deoxidization technique of described catalyzer be under normal pressure, controlled temperature 600-700 ℃, with the metallicity catalyzer of coal-seam gas through the catalyst bed in the oxidation reactor; Make oxygen and the oxidizing reaction of the methane generation flames of anger in the coal-seam gas, and generate CO 2And water; Described pressure swing absorption process be select for use void diameter greater than the oxygen molecule diameter molecular sieve less than molecular diameter of methane, the oxygen of absorption in the coal-seam gas.The oxygen level of the coal-seam gas after the deoxidation is controlled at below 0.5%.

After deviating from oxygen, the described method of this patent can obtain natural gas liquids through the spissated mode of pressurizeing; Yet in the described method of deoxidation of this patent; Need controlled temperature 600-700 ℃ reaction is carried out; So high temperature of reaction has proposed great requirement to equipment, is difficult to bear hot environment like this in case the equipment of being selected for use moves for a long time, then can have bigger potential safety hazard; On the other hand, the energy that coal-seam gas is heated to 600-700 ℃ of required consumption is excessive, relatively wastes resource.The described other a kind of method of this patent is the method for transformation absorption deoxidation; Though this method has been preserved the content of methane to greatest extent; But receive the theoretical restriction of explosion triangle; This method can only be carried out under extremely low pressure, can make that like this separation efficiency of this method is extremely low, on the other hand owing to can contain other mixed gas in the coal-seam gas; Molecular sieve less than molecular diameter of methane possibly cause separating effect undesirable to simple employing void diameter greater than the oxygen molecule diameter, makes follow-up handling procedure still have great potential safety hazard like this.

Summary of the invention

For this reason, technical problem to be solved by this invention is in the prior art that coal bed gas deoxidation technological reaction temperature is higher and to the equipment requirements problem of higher, and then provides a kind of and can accomplish deoxidation at low temperatures and realize CH in the coal-seam gas 4Isolating equipment;

Further, the invention provides a kind of use said system equipment and carry out coal-seam gas CH 4Separation processes.

For solving the problems of the technologies described above, a kind of coal-seam gas separation system of utilizing the catalyzer deoxidation of the present invention comprises connecting in order:

Compression refining plant: be used for said coal-seam gas is purified the compression pre-treatment;

Take off O 2Device: the methane and the oxygen reaction that are used for said coal-seam gas are to remove the O of coal-seam gas 2, obtain not having O 2Coal-seam gas;

Purify oil removal plant: be used to remove no O 2The micro-mist of oil that contains in the coal-seam gas;

CH 4Separation system: be used for no O 2CH in the coal-seam gas 4Separate with other components;

The product collection send system: be used to collect and carry the CH after the compression 4

The said O that takes off 2Be filled with catalyzer in the device, the O in the said coal-seam gas 2With portion C H 4In 200-250 ℃ the flames of anger takes place and react, to remove the O in the coal-seam gas under the effect of said catalyzer 2

Said catalyzer is with Fe 2O 3.Co 3O 4.MnO 2As active ingredient and be coated on the support of the catalyst surface.

Said support of the catalyst is cordierite honeycomb ceramic, cordierite ceramic ball, activated alumina or gac.

The said O that takes off 2The outside of device is provided with cooling water circulating device.

The said O that takes off 2Device inside is provided with heating unit, and said coal-seam gas is heated to temperature of reaction.

The said O that takes off 2The said inlet mouth place of device is provided with heating unit, and said coal-seam gas is heated to temperature of reaction.

Said purification oil removal plant comprises a plurality of different strainers that filter progression, be arranged at the thermostat of lowering the temperature for mixed gas before each said strainer, and the active carbon adsorber of absorb oil.

Said CH 4Separation system is film separating system or pressure swing adsorption system.

Said film separating system comprises multistage membrane separation unit, utilizes the separation step by step of each component of difference realization of the transmission speed of different components in the coal-seam gas, obtains CH 4Product.

Said pressure swing adsorption system comprises a plurality of adsorption towers and vacuum pump, and said adsorption tower is provided with CH 4The preferential molecular sieve of selecting is realized CH 4With the separation of other gases, said vacuum pump is used for the desorption of molecular sieve, obtains CH 4Product.

Said product collection send system to comprise compressor, product storage tank, flow sensor, pressure transmitter and product concentration transmitter.

The invention also discloses a kind of coal-seam gas separating technology that utilizes the catalyzer deoxidation, comprise the steps:

(1) feed gas preprocessing: coal-seam gas is purified compression, remove the water vapour, dust and the S-contained substance that contain in the coal-seam gas;

(2) remove O 2: the coal-seam gas after the purification is heated to 200-250 ℃, the O in the coal-seam gas 2With CH 4With Fe 2O 3.Co 3O 4.MnO 2Flames of anger reaction takes place down in the effect as the catalyzer of active ingredient, removes the O that contains in the coal-seam gas 2

(3) purify oil removing: will remove O 2After coal-seam gas purify oil removal treatment, remove the particulate, water and the mist of oil that contain in the coal-seam gas;

(4) CH 4Separate: the CH in the residue coal-seam gas after will purifying 4Separate with other components;

(5) Product transport is collected: the CH after will concentrating 4Collect and transmission.

In the said step (2), said coal-seam gas is at the said O that takes off 2Be heated to desired reaction temperature in the device.

In the said step (2), said coal-seam gas is getting into the said O that takes off 2Be heated to desired reaction temperature before the device.

In the said step (3), remove O 2After coal-seam gas respectively through coarse filtration, smart filter, ultra smart filtration and charcoal absorption level Four filtration step, remove the particulate, water and the mist of oil that contain in the said coal-seam gas.

In the said step (4), the residue coal-seam gas after the purification feeds said pressure swing adsorption system, through to CH 4Screening with preferential optionally molecular sieve realizes CH 4Separation, and realize CH through the vacuum pump pressing mode 4Desorption, obtain CH 4Product.

In the said step (4), the residue coal-seam gas after the purification feeds said film separating system, through the separation of multistage membrane separation unit, utilizes the separation step by step of each component of difference realization of the transmission speed of different components in the coal-seam gas, obtains CH 4Product.

In the said step (5), the CH that separation is obtained 4Product is delivered to the product storage tank and collects, and detects CH 4The flow of product gas, pressure and concentration.

Technique scheme of the present invention is compared prior art and is had the following advantages, and 1, in the coal-seam gas separating device of the present invention, the said O that takes off 2Be coated with Fe in the device 2O 3.Co 3O 4.MnO 2As the catalyzer of active ingredient, make CH in the coal-seam gas 4And O 2Flames of anger reaction can take place when being heated to 200 ℃ of left and right sides; Because temperature of reaction is lower; Therefore this is reflected in the general equipment and can accomplishes, and it is also less simultaneously coal-seam gas to be heated to 200 ℃ of required power consumptions, not only operational safety but also have the advantage of energy-conserving and environment-protective; 2, the said O that takes off 2The device outside is provided with cooling water circulating device, can effectively control the speed of reaction through control reaction temperature, guarantees that reaction process is safe and efficient; 3, select for use pressure swing adsorption system to realize CH 4With separating of other component gas, through select for use to molecular sieve that preoption is arranged can efficiently and accurately with CH 4Separate with other component gas; 4, select for use film separating system to realize CH 4With separating of other component gas, have separation efficiency height, facility compact, floor space is little, energy consumption is lower, easy and simple to handle, maintenance easily, advantage such as investment is less; Though 5 have consumed few partial C H in the incendiary process 4Gas, but the potential safety hazard that exists in the disposable coal-bed gas exploitation, the CH that collects 4Can act on energy and develop once more, meet energy conservation and environment protection in the process of coal mining.

Description of drawings

For content of the present invention is more clearly understood, below according to a particular embodiment of the invention and combine accompanying drawing, the present invention is done further detailed explanation, wherein

Fig. 1 is the theoretical synoptic diagram of explosion triangle;

Fig. 2 is the embodiment of the invention 1 a said coal-seam gas separation system synoptic diagram;

Fig. 3 is the embodiment of the invention 2 said coal-seam gas separation system synoptic diagram.

Reference numeral is expressed as among the figure: 1-compresses refining plant, and 2-takes off O 2Device, 3-catalyzer, 4-heating unit, 5-air compressor machine, 6-gas mixture gas-holder, 7-gas mixture refining plant, the clean gas gas-holder of 8-, 9-pressure swing adsorption system, 10-product gas-holder, one section film treater of 11-, 12-two-segment film treater.

Embodiment

Embodiment 1

As shown in Figure 2, the coal-seam gas separation system of utilizing the catalyzer combustion deoxidizing of the present invention comprises the compression refining plant, takes off O 2Device, purification oil removal plant, CH 4Separation system and product collection send system;

Said compression refining plant 1 is used for said coal-seam gas is carried out pre-treatment, and said compression refining plant 1 comprises dust removal installation, sulphur removal equipment and water removal device, is used for said coal-seam gas is carried out pre-treatment.Said coal-seam gas through lobe pump after 1atm normal atmosphere lower compression, successively through said dust removal installation, sulphur removal equipment and water removal device.Selected dust removal installation is water curtain or Zigzag type tank; Sulphur removal equipment is dry type basic catalyst filter tank or wet type copper sulfate washing bath; Water removal device is organic silica gel absorption and takes off cucurbitula.Make and only contain O in the coal-seam gas 2, N 2, CH 4And CO 2Deng gas.

The said O that takes off 2Device 2 is used for removing the contained O of coal-seam gas after the purification 2The said O that takes off 2Device 2 is a tank structure, and its inner filling has catalyzer 3, and said catalyzer 3 is with Fe 2O 3.Co 3O 4.MnO 2As active ingredient, and be coated on the cordierite honeycomb ceramic outside, said Fe with the form of slurries 2O 3.Co 3O 4.MnO 2The ratio of each component is 1.5-2: 1-2: 1-2 in the active ingredient, and said cordierite honeycomb ceramic inside is equipped with sealing electric heater unit 4, the O in the said coal-seam gas after heating 2With CH 4Flames of anger reaction takes place under the effect of said catalyzer 3, can consume the O that contains in the coal-seam gas 2, the said O that takes off 2The outside of device 2 is provided with cooling water circulating device with the control speed of reaction.

Said purification oil removal plant is used for removing the micro-mist of oil that coal-seam gas contains; Avoid the separating device of micro-mist of oil contaminate subsequent contained in the coal-seam gas; Said purification oil removal plant is included as the air compressor machine 5 of gas mixture pressurization; Gas mixture is cushioned the gas mixture gas-holder 6 with equilibrium system pressure, and gas mixture refining plant 7, said gas mixture refining plant 7 comprises coarse filter, fine filter and the ultra fine filter that connection in order and filtering accuracy promote gradually; Be arranged at first thermostat and second thermostat that said fine filter and ultra fine filter are lowered the temperature for mixed gas before respectively; And the active carbon adsorber of absorb oil, and the gas mixture after will purifying is collected into clean gas gas-holder 8, to get into the next stage separation system.

Said CH 4Separation system is used for the CH with coal-seam gas 4Separate said CH with other components 4Separation system selects for use pressure swing adsorption system 9 to carry out CH 4Separation, said pressure swing adsorption system 9 comprises in order 3-4 adsorption tower connecting, control between each adsorption tower that the duct type pneumavalve of gas flow, exhaust silencer and realization molecular sieve desorption obtain CH in the pipeline 4The vacuum pump of product.

Said product collection send system to be used to carry the CH after concentrating 4And collect, said product collection send system to comprise oil free screw compressor, product storage tank 10, flow sensor, pressure transmitter and product concentration transmitter.This system provides product gas to adsorption tower on the one hand, and to clean the impure gas in the space between the molecular sieve, adsorbing for the transformation of adsorption tower provides optimum environment; Carry the CH after concentrating to the product storage tank on the other hand 4Product; The 3rd, can detect CH 4The flow of product gas, purity and pressure.

Utilize above-mentioned coal-seam gas separation system to the CH in the coal-seam gas 4The technical process that gas carries out separation and Extraction is:

(1) feed gas preprocessing: with coal-seam gas successively through lobe pump under the 1atm normal atmosphere, pressurize the entering high-effective dust-removing, dewater, purify in the sulphur removal equipment, slough water vapour a large amount of in the gas, dust and S-contained substance.Selected dust removal installation is water curtain or Zigzag type tank; Sulphur removal equipment is dry type basic catalyst filter tank or wet type copper sulfate washing bath; Water removal device is organic silica gel absorption and takes off cucurbitula.Make and only contain O in the coal-seam gas 2, N 2, CH 4And CO 2Deng gas.

(2) remove O 2: contain residual gas O after will purifying 2, H 2, CH 4, CO 2Deng the coal-seam gas of gas from the said O that takes off 2The inlet mouth of device 2 feeds the said O that takes off 2In the device 2, be arranged at the said O of taking off 2Sealing electric heater unit 4 in the device is heated to 200-250 ℃ with said coal-seam gas, at this moment the O in the coal-seam gas 2With CH 4Flames of anger reaction takes place, and other component gas in the coal-seam gas are not participated in reaction under the effect of catalyzer, because CH 4With O 2The combustion reactions ratio be 1: 2, therefore can remove the O that contains in the coal-seam gas fully 2, and keep most CH 4Gas removes O 2After the residue coal-seam gas from the said O that takes off 2Discharge the residual gas air outlet of device 2, gets into said purification oil removal plant.

(3) purify oil removing: will remove O 2After coal-seam gas pressurize through screw-rod air compressor 5, and be delivered to gas mixture gas-holder 6, adopting gas mixture gas-holder 6 is in order air inlet to be cushioned, to make pressure equalization, reduce the air-flow pulse, reduce the system pressure fluctuation, the realization system steadily uses gas; Coal-seam gas in the gas mixture gas-holder 6 get into gas mixture refining plants 7 and purify, and to remove the oil in the gas mixture, can poison molecular sieve after avoiding getting into adsorber, cause the permanent inefficacy of molecular sieve; Said coal-seam gas is removed particulate and most of water greater than 1 μ m through coarse filter, and gets into first thermostat coal-seam gas is cooled to about 5 ℃, makes condensation vapor Cheng Shui wherein, and it is separated the discharge system; Said coal-seam gas is passed through particle and the profit of fine filter elimination greater than 0.01 μ m again; Get into the profit of said ultra fine filter elimination after utilizing second thermostat to make gas mixture reduce to about-10 ℃, at last again through the micro-mist of oil of active carbon adsorber absorption residue greater than 0.001 μ m; Coal-seam gas after purifying is fed clean gas gas-holder 8, in order to getting into CH 4The separation system separation obtains product.

(4) CH 4Separate: the coal-seam gas after will purifying feeds said pressure swing adsorption system 9, realizes CH 4Gas separates with other component gas.Said pressure swing adsorption system 9 is to utilize pressure with molecular sieve gas mixture to be separated; In order to make isolating methane gas that higher concentration arranged; Be equipped with in the adsorber the preferential molecular sieve of selecting of methane; Said molecular screening uses the 5A molecular sieve of aperture as 0.5nm, under the 25atm in 20-50 ℃ of work, the N of said molecular sieve under the 760mm mercurypressure 2Separation rate is 1.37.This is that the molecular sieve volume accounts for the reactor volume large percentage because the methane proportion is less in the gas mixture, makes that remaining space is less in the reactor drum.It is to be main with adsorbed methane that reactor drum adopts this molecular sieve, and all the other gas mixture components are all discharged adsorption tower as enriched gas continuously.The molecular sieve that fulfils assignment through vacuum pump under the 0.5mm mercurypressure, 20 ℃ of isothermal desorptions attach, with the CH that is adsorbed in the molecular sieve hole 4Molecule is released, and realizes the desorption of molecular sieve in the adsorption tower, and after separating, obtains CH 4The gas product.

(5) Product transport is collected: the CH that separation is obtained 4The pressurization of product oil free screw compressor concentrates, and is delivered to 10 collections of product storage tank, and through flow sensor, pressure transmitter, product concentration sensor detecting CH 4The flow of product gas, pressure and concentration.Simultaneously portioned product gas is transported to the pressure-swing absorber place provides product gas, cleaning the impure gas in the space between the molecular sieve, for the absorption of adsorption tower provides optimum environment.

Embodiment 2

As shown in Figure 3, the coal-seam gas separation system of utilizing the catalyzer combustion deoxidizing of the present invention comprises compression refining plant 1, takes off O 2Device 2, purification oil removal plant, CH 4Separation system and product collection send system;

Said compression refining plant 1 is used for said coal-seam gas is carried out pre-treatment, and said compression refining plant comprises dust removal installation, sulphur removal equipment and water removal device, is used for said coal-seam gas is carried out pre-treatment.Selected dust removal installation is water curtain or Zigzag type tank; Sulphur removal equipment is dry type basic catalyst filter tank or wet type copper sulfate washing bath; Water removal device is organic silica gel absorption and takes off cucurbitula.Make and only contain O in the coal-seam gas 2, N 2, CH 4And CO 2Deng gas.

The said O that takes off 2Device 2 is used for removing the contained O of coal-seam gas after the purification 2The said O that takes off 2Device 2 is a tank structure, and its inner filling has catalyzer 3, and said catalyzer 3 is with Fe 2O 3.Co 3O 4.MnO 2As active ingredient, and it is outside to be coated on cordierite ceramic ball or activated alumina or gac with the form of slurries, said Fe 2O 3.Co 3O 4.MnO 2The ratio of each component is 1.5-2: 1-2: 1-2 in the active ingredient, the O in the said coal-seam gas after heating 2With CH 4Flames of anger reaction takes place under the effect of said catalyzer, can consume the O that contains in the coal-seam gas 2, the said O that takes off 2The coal-seam gas inlet mouth place of device 2 is provided with 4 pairs of coal-seam gas of electric heater unit heats, and its outside is provided with cooling water circulating device with the control speed of reaction.

Said purification oil removal plant is used for removing the micro-mist of oil that coal-seam gas contains; Avoid the separating device of micro-mist of oil contaminate subsequent contained in the coal-seam gas; Said purification oil removal plant is included as the air compressor machine 5 of gas mixture pressurization; Gas mixture is cushioned the gas mixture gas-holder 6 with equilibrium system pressure, and gas mixture refining plant 7.Said gas mixture refining plant 7 comprises coarse filter, fine filter and the ultra fine filter that connection in order and filtering accuracy promote gradually; Be arranged at first thermostat and second thermostat that said fine filter and ultra fine filter are lowered the temperature for mixed gas before respectively; And the active carbon adsorber of absorb oil; And the gas mixture after will purifying is collected into clean gas gas-holder 8, to get into the next stage separation system.

Said CH 4Separation system is used for the CH with coal-seam gas 4Separate said CH with other components 4Separation system selects for use film separating system to realize CH 4Gas separates with other component gas.Said film separating system is provided with multistage multi-stage type membrane separation unit according to the difference of component in the coal-seam gas and flow, utilizes the separation step by step of each component of difference realization of the transmission speed of different components in the coal-seam gas, obtains CH 4Product.

Said product collection send system to be used to carry the CH after concentrating 4And collect, said product collection send system to comprise oil free screw compressor, product storage tank 10, flow sensor, pressure transmitter and product concentration transmitter.This system carries the CH after concentrating to the product storage tank on the one hand 4Product; Simultaneously can detect CH 4The flow of product gas, purity and pressure.

Utilize above-mentioned coal-seam gas separation system to the CH in the coal-seam gas 4The technical process that gas carries out separation and Extraction is:

(1) feed gas preprocessing: with coal-seam gas successively through lobe pump under 1atm, pressurize the entering high-effective dust-removing, dewater, purify in the sulphur removal equipment, slough water vapour a large amount of in the gas, dust and S-contained substance.Selected dust removal installation is water curtain or Zigzag type tank; Sulphur removal equipment is dry type basic catalyst filter tank or wet type copper sulfate washing bath; Water removal device is organic silica gel absorption and takes off cucurbitula.Make and only contain O in the coal-seam gas 2, N 2, CH 4And CO 2Deng gas.

(2) remove O 2: contain residual gas O after will purifying 2, N 2, CH 4, CO 2Deng the coal-seam gas of gas from the said O that takes off 2The coal-seam gas inlet mouth of device 2 feeds the said O that takes off 2In the device 2, said coal-seam gas is heated to 200-250 ℃ in said ingress through electric heater unit 4, feeds the said O of taking off this moment 2O in the coal-seam gas of device 2 2With CH 4Flames of anger reaction takes place, and other component gas in the coal-seam gas are not participated in reaction under the effect of catalyzer, because CH 4With O 2The combustion reactions ratio be 1: 2, therefore can remove the O that contains in the coal-seam gas fully 2, and the CH of retained part 4Gas removes O 2After the residue coal-seam gas from the said O that takes off 2Discharge the residual gas air outlet of device 2, gets into said purification oil removal plant.

(3) purify oil removing: will remove O 2After coal-seam gas pressurize through screw-rod air compressor 5, and be delivered to gas mixture gas-holder 6, adopting gas mixture gas-holder 6 is in order air inlet to be cushioned, to make pressure equalization, reduce the air-flow pulse, reduce the system pressure fluctuation, the realization system steadily uses gas; Coal-seam gas in the gas mixture gas-holder 6 get into gas mixture refining plants 7 and purify, and to remove the oil in the gas mixture, avoid getting into the work-ing life that can influence filter membrane behind the film separating system; Said coal-seam gas is removed particulate and most of water greater than 1 μ m through coarse filter, and gets into first thermostat coal-seam gas is cooled to about 5 ℃, makes condensation vapor Cheng Shui wherein, and it is separated the discharge system; Said coal-seam gas is passed through particle and the profit of fine filter elimination greater than 0.01 μ m again; Get into the profit of said ultra fine filter elimination after utilizing second thermostat to make gas mixture reduce to about-10 ℃, at last again through the micro-mist of oil of active carbon adsorber absorption residue greater than 0.001 μ m; Coal-seam gas after purifying is fed clean gas gas-holder 8, in order to getting into CH 4The separation system separation obtains product.

(4) CH 4Separate: the coal-seam gas after will purifying feeds said film separating system, realizes CH 4Gas separates with other component gas, and this moment, the staple of coal-seam gas was N 2, CO 2And CH 4With said coal-seam gas through screw-rod air compressor pressurization, and one section film treater 11 of the feeding one-level of the coal-seam gas after will pressurize because in gas mixture CO 2Belong to fast gas, be separated through film as infiltration gas.Comprise N 2And CO 2The residual air of oozing get into two-segment film treater 12, N comparatively speaking 2Be fast gas, so N 2See through as infiltration gas, and CH 4Become and ooze the residual air body and obtain separating.CH 4Gas gets into the product collection and send system after the reducing valve decompression.Said film separating system should be taked different concatenated schemes with different components according to the different flow of the coal-seam gas of reality, as takes the mode of one-level multistage parallel connection to improve production capacity and separation accuracy, or takes the round-robin method to improve separation purity.

(5) Product transport is collected: the CH that separation is obtained 4The pressurization of product oil free screw compressor concentrates, and is delivered to 10 collections of product storage tank, and through flow sensor, pressure transmitter, product concentration sensor detecting CH 4The flow of product gas, pressure and concentration.

Obviously, the foregoing description only be for explanation clearly done for example, and be not qualification to embodiment.For the those of ordinary skill in affiliated field, can also make other multi-form variation or change on the basis of the above description.Here need not also can't give exhaustive to all embodiments.And conspicuous variation of being extended out thus or change still are among the protection domain of the invention.

Claims (17)

1. coal-seam gas separation system of utilizing the catalyzer deoxidation comprises connecting in order:
Compression refining plant (1): be used for said coal-seam gas is purified the compression pre-treatment;
Take off O 2Device (2): the methane and the oxygen reaction that are used for said coal-seam gas are to remove the O of coal-seam gas 2, obtain not having O 2Coal-seam gas;
Purify oil removal plant: be used to remove no O 2The micro-mist of oil that contains in the coal-seam gas;
CH 4Separation system: be used for no O 2CH in the coal-seam gas 4Separate with other components;
The product collection send system: be used to collect and carry the CH after the compression 4
It is characterized in that:
The said O that takes off 2Be filled with catalyzer (3) in the device, the O in the said coal-seam gas 2With portion C H 4In 200-250 ℃ the flames of anger takes place and react, to remove the O in the coal-seam gas under the effect of said catalyzer 2
Said catalyzer is with Fe 2O 3.Co 3O 4.MnO 2As active ingredient and be coated on the support of the catalyst surface.
2. the coal-seam gas separation system of utilizing the catalyzer deoxidation according to claim 1 is characterized in that:
Said support of the catalyst is cordierite honeycomb ceramic, cordierite ceramic ball, activated alumina or gac.
3. the coal-seam gas separation system of utilizing the catalyzer deoxidation according to claim 2 is characterized in that:
The said O that takes off 2The outside of device (2) is provided with cooling water circulating device.
4. the coal-seam gas separation system of utilizing the catalyzer deoxidation according to claim 3 is characterized in that:
The said O that takes off 2Device inside is provided with heating unit (4), and said coal-seam gas is heated to temperature of reaction.
5. the coal-seam gas separation system of utilizing the catalyzer deoxidation according to claim 3 is characterized in that:
The said O that takes off 2The said inlet mouth place of device is provided with heating unit (4), and said coal-seam gas is heated to temperature of reaction.
6. according to the arbitrary described coal-seam gas separation system of utilizing the catalyzer deoxidation of claim 1-5, it is characterized in that:
Said purification oil removal plant comprises a plurality of different strainers that filter progression, be arranged at the thermostat of lowering the temperature for mixed gas before each said strainer, and the active carbon adsorber of absorb oil.
7. according to the arbitrary described coal-seam gas separation system of utilizing the catalyzer deoxidation of claim 1-5, it is characterized in that:
Said CH 4Separation system is film separating system or pressure swing adsorption system (9).
8. the coal-seam gas separation system of utilizing the catalyzer deoxidation according to claim 7 is characterized in that:
Said film separating system comprises multistage membrane separation unit, utilizes the separation step by step of each component of difference realization of the transmission speed of different components in the coal-seam gas, obtains CH 4Product.
9. the coal-seam gas separation system of utilizing the catalyzer deoxidation according to claim 7 is characterized in that:
Said pressure swing adsorption system comprises a plurality of adsorption towers and vacuum pump, and said adsorption tower is provided with CH 4The preferential molecular sieve of selecting is realized CH 4With the separation of other gases, said vacuum pump is used for the desorption of molecular sieve, obtains CH 4Product.
10. according to the arbitrary described coal-seam gas separation system of utilizing the catalyzer deoxidation of claim 1-5, it is characterized in that:
Said product collection send system to comprise compressor, product storage tank (10), flow sensor, pressure transmitter and product concentration transmitter.
11. a coal-seam gas separating technology that utilizes the catalyzer deoxidation is characterized in that, comprises the steps:
(1) feed gas preprocessing: coal-seam gas is purified compression, remove the water vapour, dust and the S-contained substance that contain in the coal-seam gas;
(2) remove O 2: the coal-seam gas after the purification is heated to 200-250 ℃, the O in the coal-seam gas 2With CH 4With Fe 2O 3.Co 3O 4.MnO 2Flames of anger reaction takes place down in the effect as the catalyzer of active ingredient, removes the O that contains in the coal-seam gas 2
(3) purify oil removing: will remove O 2After coal-seam gas purify oil removal treatment, remove the particulate, water and the mist of oil that contain in the coal-seam gas;
(4) CH 4Separate: the CH in the residue coal-seam gas after will purifying 4Separate with other components;
(5) Product transport is collected: the CH after will concentrating 4Collect and transmission.
12. the coal-seam gas separating technology that utilizes the catalyzer deoxidation according to claim 11 is characterized in that:
In the said step (2), said coal-seam gas is at the said O that takes off 2Be heated to desired reaction temperature in the device.
13. the coal-seam gas separating technology that utilizes the catalyzer deoxidation according to claim 11 is characterized in that:
In the said step (2), said coal-seam gas is getting into the said O that takes off 2Be heated to desired reaction temperature before the device.
14., it is characterized in that according to the arbitrary described coal-seam gas separating technology that utilizes the catalyzer deoxidation of claim 11-13:
In the said step (3), remove O 2After coal-seam gas respectively through coarse filtration, smart filter, ultra smart filtration and charcoal absorption level Four filtration step, remove the particulate, water and the mist of oil that contain in the said coal-seam gas.
15., it is characterized in that according to the arbitrary described coal-seam gas separating technology that utilizes the catalyzer deoxidation of claim 11-13:
In the said step (4), the residue coal-seam gas after the purification feeds said pressure swing adsorption system, through to CH 4Screening with preferential optionally molecular sieve realizes CH 4Separation, and realize CH through the vacuum pump pressing mode 4Desorption, obtain CH 4Product.
16., it is characterized in that according to the arbitrary described coal-seam gas separating technology that utilizes the catalyzer deoxidation of claim 11-13:
In the said step (4), the residue coal-seam gas after the purification feeds said film separating system, through the separation of multistage membrane separation unit, utilizes the separation step by step of each component of difference realization of the transmission speed of different components in the coal-seam gas, obtains CH 4Product.
17., it is characterized in that according to the arbitrary described coal-seam gas separating technology that utilizes the catalyzer deoxidation of claim 11-13:
In the said step (5), the CH that separation is obtained 4Product is delivered to the product storage tank and collects, and detects CH 4The flow of product gas, pressure and concentration.
CN2011101355479A 2011-05-24 2011-05-24 Coal bed gas separating system and process utilizing catalyst to deoxidize CN102321493B (en)

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