CN107617307A - It is a kind of to there is molecular sieve function and using physical absorption and the coal bed gas purifying plant and technique of desorption principle - Google Patents
It is a kind of to there is molecular sieve function and using physical absorption and the coal bed gas purifying plant and technique of desorption principle Download PDFInfo
- Publication number
- CN107617307A CN107617307A CN201710965953.5A CN201710965953A CN107617307A CN 107617307 A CN107617307 A CN 107617307A CN 201710965953 A CN201710965953 A CN 201710965953A CN 107617307 A CN107617307 A CN 107617307A
- Authority
- CN
- China
- Prior art keywords
- coal bed
- bed gas
- purifying plant
- gas purifying
- methane
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- 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
- Y02C—CAPTURE, STORAGE, SEQUESTRATION OR DISPOSAL OF GREENHOUSE GASES [GHG]
- Y02C20/00—Capture or disposal of greenhouse gases
- Y02C20/20—Capture or disposal of greenhouse gases of methane
Abstract
The present invention relates to a kind of with molecular sieve function and using physical absorption and coal bed gas purifying plant, system and the technique of desorption principle, device includes multiple adsorption plates and the framework for adsorption plate to be fixedly mounted, multiple adsorption plates are spaced and sealed between adjacent two adsorption plates, form the runner of coal supply layer air-flow warp, the opposite end of framework has the air inlet connected with the both ends of runner and gas outlet respectively, adsorption plate has molecular sieve function, its can selective absorption methane and molecular volume in coal bed gas can be made to be less than the gas molecule of methane and passed through.Purifying plant of the present invention and system are on the premise of former underground extraction coal bed gas, discharge coalbed methane system and function is retained, effective purification ＆ isolation can be carried out to the methane in coal bed gas, the content of methane is less than 5% in discharge gas after the present invention purifies, methane utilization rate can be improved while reduce atmosphere pollution, in addition, apparatus of the present invention structure setting is simple, and operation is efficient, energy consumption is low, takes up an area small.
Description
Technical field
The invention belongs to coal bed gas to purify field, and in particular to device and work for the purification of underground extraction coal bed gas
Skill.
Background technology
The exploitation of domestic coal bed gas, mainly ground well drainage and underground extraction.Ground extraction is that coal bed gas conduct has
Mineral resources, by ground drilling, the technology such as drilling completion and pressure break in coal seam is horizontal using coal bed gas multiple-limb
The complicated structure well technology such as well, U-shaped well, ground drilling coal bed gas achieve preferable effect.Has successful experience, ground both at home and abroad
Extraction coal bed gas can realize the large-scale production of coal bed gas.The coal bed gas methane concentration of surface mining is high, general methane content
＞ 95%, quality is not worse than conventional gas.Underground extraction is in progress of coal mining, and special extraction is tunneled in coal seam
Tunnel, in this coal seam, adjacent coal seam and goaf hole pumping and mining, the coal bed gas methane concentration gone out by water ring pump extraction exists
Between 1% -30%.It is big using difficulty, with the increase of extraction amount, on the contrary using having declined, mostly using high-order emptying.
The coal bed gas of domestic emptying in 2013 is also increasing, its greenhouse effects is higher than carbon dioxide year by year up to 15,000,000,000 sides.
The purification technique of current domestic underground extraction coal bed gas is mainly Vacuum Pressure Swing Adsorption (VPSA).Low concentration coal-bed gas
After being adsorbed under pressure-fired, then using the method reduction methane (CH vacuumized4) partial pressure it is desorbed and is collected, work
Skill flow chart is referring to Fig. 1.I it is pressurising in Fig. 1, II is absorption, III is cocurrent decompression, IV is countercurrent depressurization, V is vacuumizes group
Into using activated carbon granule filling in adsorption tower.Handle the CH that raw material is extraction pump discharge4Coal of the content between 5%-50%
Layer gas, pass through CH after two-stage absorption purification4Content up to 30-90%.The gas CH of discharge4The usual ＞ 5% of content, even
＞ 10%, equipment complexity floor space are big, it is difficult to popularization and application.Therefore with the increase year by year of underground extraction coal seam tolerance, instead
And utilization rate has declined, mostly empty.
The content of the invention
The technical problems to be solved by the invention are to overcome prior art coal bed gas purifying plant and purifying technique not
Foot, there is provided a kind of new coal bed gas purifying plant and purifying technique, effectively to be purified to underground extraction coal bed gas, effectively carry
High CH4Utilization rate and reduce CH4Discharge content.
In order to solve the above technical problems, the present invention adopts the following technical scheme that：
A kind of coal bed gas purifying plant, it includes multiple adsorption plates and the framework for adsorption plate to be fixedly mounted, multiple
Adsorption plate is spaced and sealed between adjacent two adsorption plates, forms the runner of coal supply layer air-flow warp, the opposite end of framework
There is the air inlet connected with the both ends of runner and gas outlet, adsorption plate to have molecular sieve function respectively, it can selectively inhale
Attached methane and molecular volume in coal bed gas can be made to be less than the gas molecule of methane and passed through.
According to the present invention, molecular volume includes but is not limited to nitrogen (N less than the gas molecule of methane in coal bed gas2, oxygen
(O2), water (H2O), hydrogen (H2), carbon dioxide (CO2) etc..
Preferably, the adsorption plate is compressing after being activated by activated carbon granule, or it is compressing after activated again
It is made.Wherein described activation can use activated carbon activation method well known in the art.
It is further preferred that the activated carbon granule for forming the adsorption plate has more than two kinds of diameter, and more than two kinds
The activated carbon granule of diameter is used in the ratio for forming most dense packing.
There are two kinds according to the activated carbon granule in one embodiment of the invention, forming the adsorption plate,
Wherein set a diameter of Dp of larger bulky grain, less small particle diameters are 0.2Dp-0.3Dp, larger bulky grain activated carbon with
The accounting of less little particle activated carbon is respectively 71.7% and 28.3%.
In the another embodiment according to the present invention, the activated carbon granule for forming the adsorption plate has more than three kinds,
The activated carbon granule requires to design according to Horsfield closestpackings.
Preferably, it is described compressing including procedure below：Activated carbon granule is placed in mould, first applies first pressure
First stage compression is carried out, grain density is reached tap density, then applies second pressure and carries out second stage compression, make
Granulosa is further closely knit, and wherein second pressure is more than first pressure, in the presence of second pressure, activated carbon granule part wedge angle
And a certain degree of broken, the forced penetration flowing of subparticle generation irreversibility occurs for protruding parts, and it is filled in smaller
Space in.
According to a preferred aspect of the present invention, the adsorption plate is herringbone corrugated plating.It is further preferred that the absorption
Cross direction profiles arrangement of the herringbone ripple of plate along adsorption plate.
According to the present invention, the thickness of the adsorption plate can be such as 40-100mm, a height of such as 25-40mm of ripple, ripple
Away from for 70-120mm.
Further, it is 5%-20% according to the air penetrability of the adsorption plate of the present invention.In a detailed embodiment, inhale
The air penetrability of attached plate is 5%-9%.
According to the present invention, due to the structure type using similar heat exchanger, it can be set the coal bed gas purifying plant
For the various flows or path combination passed through for coal bed gas, it is specifically as follows single process, multipaths or any combination of the two, its
Middle combination can be serial or parallel connection.
According to a preferred aspect of the present invention, the coal bed gas purifying plant is using single channel, more backflows, series-parallel connection form
Path combination or single channel, more backflow, the path combination of cascade.These path combinations are taken to improve adjacent two
Pressure differential between adsorption plate, help to give full play to the molecular sieve function of adsorption plate so as to be advantageous to improve refining effect.
According to one of the present invention specific and preferred aspect, the framework uses the structure shape similar to plate type heat exchanger
Formula.Specifically, the framework includes fixed pressure plate, movable pressure plate, pillar, upper lower guide rod and fishbolt, it is described
Multiple adsorption plates are uprightly arranged between the fixed pressure plate and movable pressure plate, and corner apertures, institute are provided with the angle of adsorption plate
The upper and lower part for the adsorption plate stated is respectively equipped with guide groove, and the position of adsorption plate is determined described by upper and lower guide rod
Between fixed pressure plate and movable pressure plate, it is fixed by fishbolt, is divided on described fixed pressure plate, movable pressure plate
It is not provided with flange hole, the flange hole on the fixed pressure plate, movable pressure plate respectively constitutes the air inlet and gas outlet.
It is further preferred that the framework surrounding is provided with dismountable stainless steel plate, to form a closed box,
Wherein described flange hole exposes, and formed with separate cavities between the casing and the adsorption plate, the isolated chambers are interior to be used to fill out
Inflated with nitrogen, automatic blow off valve valve air relief is provided with the casing top.
The present invention further provides a kind of coal bed gas purification system, the coal bed gas purification system includes the coal bed gas of the present invention
Purifying plant and vavuum pump, the wherein air inlet of coal bed gas purifying plant are connected with extraction coal seam compressor, coal bed gas purification
The gas outlet of device and the import of vavuum pump are connected, and the outlet of vavuum pump is connected with methane pipeline.
According to the present invention, extraction coal seam compressor, methane pipeline are that current domestic underground extraction coalbed methane system is had
Have.
Preferably, described coal bed gas purification system includes 2,3 or more the coal bed gas purifying plants, described
The air inlet of multiple coal bed gas purifying plants and the outlet of extraction coal seam compressor and company, and purified in each coal bed gas
The inlet end of device and outlet side are separately installed with pneumatic switching valve, in the gas outlet of each coal bed gas purifying plant and outlet
The import that connecting tube and vavuum pump are respectively equipped between the pneumatic switching valve at end connects, and is provided with described connecting tube pneumatic
Gate valve.
The present invention also provides a kind of method of purification of underground extraction coal bed gas, and this method uses coal seam air lift as described above
Pure lines system carries out the purification of underground extraction coal bed gas, and it comprises the following steps：
The absorption purification of coal bed gas：The extraction coal seam atmospheric pressure of extraction coal seam compressor conveying is set to be delivered to the coal bed gas
In purifying plant, in the coal bed gas purifying plant, surface flow of the coal bed gas between adsorption plate and adsorption plate, both
Heat and mass adsorbed methane again is carried out, and allows other molecular volumes in coal bed gas to be less than the gas molecule of methane and oozed under entrance
One flow, the surface entered containing the relatively low coal bed gas of methane between the adsorption plate and adsorption plate of downstream is flowed, then enters
Row heat and mass, adsorb, oozed and enter back into downstream, last methane content is less than 5% coal bed gas, is flowed into by gas outlet
Emptying system discharges, and methane is adsorbed plate absorption；
The parsing of methane：Vavuum pump is opened, is desorbed by vacuumizing the methane for adsorbing adsorbed plate, obtains methane
The natural gas of purity more than 90%.
According to a preferred aspect of the present invention, the coal bed gas purifying plant is 2, a coal seam air lift thereto
While pure device is sent into the absorption purification of coal bed gas progress coal bed gas, using vavuum pump to another coal bed gas purifying plant
Vacuumize the parsing for carrying out methane.
Coal bed gas purifying plant described according to a further preferred aspect of the invention, is 3, a coal seam air lift thereto
While pure device is sent into the absorption purification of coal bed gas progress coal bed gas, using vavuum pump to another coal bed gas purifying plant
The parsing for carrying out methane is vacuumized, while the absorption purification of also one coal bed gas purifying plant completion coal bed gas is prepared to enter into first
The parsing of alkane.
Due to the utilization of above-mentioned technical proposal, the present invention has following advantage compared with prior art：
Purifying plant of the present invention and system are retaining the premise of former underground extraction coal bed gas, discharge coalbed methane system and function
Under, can be to the effective purification ＆ isolation of methane progress in coal bed gas, methane in the discharge gas after apparatus of the present invention purify
Content be less than 5%, the present invention had both improved the utilization rate of methane, reduces the emptying of methane again, reduces atmosphere pollution.This
Outside, apparatus of the present invention structure setting is simple, and operation is efficient, energy consumption is low, takes up an area small.
Brief description of the drawings
The present invention is described in further details below in conjunction with the drawings and specific embodiments, wherein：
Fig. 1 is Vacuum Pressure Swing Adsorption (VPSA) process chart used in the prior art, wherein I is pressurising, II is suction
Attached, III is that cocurrent depressurizes, and IV is countercurrent depressurization, and V is to vacuumize；
Fig. 2 shows a form of activated carbon plate, wherein 1, horizontal mitre herringbone wave, 2, seal groove, 3, corner apertures,
4th, guide groove；
Fig. 3 is that A-A is to diagrammatic cross-section (normal profile of horizontal mitre herringbone wave) in Fig. 2, wherein for coal bed gas
Pressure is 0.05MPa (G)；
Fig. 4 is that A-A is to diagrammatic cross-section (normal profile of horizontal mitre herringbone wave) in Fig. 2, wherein for coal bed gas
Pressure is 0.4MPa (G)；
Fig. 5 is the path combination for the two backflow series-parallel connection forms that coal seam atmospheric pressure is 0.05MPa (G), wherein 5, in parallel one
The port of export is back to, 6, two backflows are since arrival end；
Fig. 6 is the path combination figure for the two backflow cascades that coal seam atmospheric pressure is 0.4MPa (G), wherein 7, one is back to
The port of export, 8, two backflows are since arrival end；
Fig. 7 is the outline drawing of coal bed gas purifying plant, wherein 9, coal bed gas outlet(discharge) flange, 10, automatic blow off valve valve air relief, 11, enter
Mouthful flange, 12, lay pin；
Fig. 8 is the structural representation of coal bed gas purification system, wherein 13, coal bed gas purifying plant, 14, pneumatic switching valve,
15th, Pneumatic gate valve, 16, vavuum pump, 17, extraction coal bed gas compressor.
Embodiment
The present invention propose one kind there is molecular sieve function, using physical absorption and desorb principle coal bed gas purifying plant,
Purification for underground extraction coal bed gas.Its operation principle is, by the activated carbon granule (activated carbon of preferably a variety of different-diameters
Grain is by a certain percentage) adsorbent bed of adsorption plate (also known as following activated carbon plate) shape that compacting forms, possess after overactivation
Gas permeability.It can allow nitrogen N2, oxygen O2, water H2O, hydrogen H2, carbon dioxide CO2Molecule enters, and is discharged by adsorbent bed.And molecular proportion
Larger methane CH4Into being attracted on the surface of activated carbon molecule.After absorption monolayer, adsorbed CH4Molecule may be used also
To utilize CH4Intermolecular gravitation adsorbs the second layer again, third layer molecule ... can form polymolecular adsorption layer.According to this machine
The coal bed gas purifying plant formed is managed, existing molecular sieve function has physical absorption CH4 function again.Make CH4 by vacuumizing again
Desorb, it is possible to obtain the natural gas of CH4 purity more than 90%.
2nd, design method：
(1) physical absorption and desorption calculate：
Using thermodynamic (al) adsoption equation, calculated with the adsorption rate equation of Polanyi Adsorption Potential Theory.Micropore diameter
It is in Gaussian Profile for 3.6nm -4.0nm charcoal absorption potential functions (ε) formed, is adsorbed the volume V shared by mediumcWith suction
Attached dose of total space V0And existing relational expression is as follows between absorption potential (ε)：
B represents adsorbent microcellular structure parameter in formula, and B values reduce with the increase of adsorbent voidage, and β is affinity coefficient
It is relevant with adsorbate.
Another form of D-A equations is derived more than：
In formula, Va and V0Respectively adsorption volume and limit micropore volume (m3)；T is adsorbent temperature (K)；P is adsorbate
Pressure；T and Ps are the corresponding saturation pressure Ps of adsorbate temperature T.
The simulation adsorbed according to D-A equations calculates, and adsorption rate (X), can be calculated as follows：
X0=X (Ps)=X (Ts)
In formula, Ps is corresponding Ts saturation pressure.Activated carbon capillary footpath is 3.6nm-4.0nm, n=2.X0Take 0.138；n
Take 2.X0For limit adsorption rate, K is sorbent structure coefficient, and sizing activated carbon disk K takes 4.6, X00.138, n is taken to take 2.
(2) design of adsorbent bed：
Adsorbent bed be by two or more different-diameter active carbon particle, the activity suppressed by a certain percentage
Carbon slab block.
Accumulated using the activated carbon granule of two kinds of different-diameters, there was only a bead filling using each space, this
The diameter of filling ball is the maximum sphere diameter for filling void space.If a diameter of Dp of bulky grain, small particle diameters are (0.3-0.2)
Dp, bulky grain account for 71.7%, and little particle accounts for 28.3%.Optimal accumulation can be reached, form most dense packing.More than two different
The activated carbon of diameter uses Horsfield closestpackings.
Adsorbent bed is using compressing, occur when activated carbon granule is pressurized in the mould of a constant volume, between particle by
Loosely arrive close progressive formation.The ascending compression process of pressure, macropore filling stage and filling small hole stage can be divided into
Two stages.The first stage of compression, make particle rearrangement be allowed to heap tightly to each other by pressure, make taking in particle
The macrovoid for connecing crane span structure formation is collapsed, and its space is replaced by solid particle.First stage terminate after grain density
Equivalent to tap density.The second stage of compression, bigger pressure make granule partial wedge angle and protruding parts occur to a certain degree
It is broken, and make subparticle that the forced penetration flowing of irreversibility occur, it is real so as to effectively be filled in less space
Now stratum granulosum is further closely knit.
In mould internal pressure preparing active carbon plate, by experiment after first stage compression is completed, into second stage
The compression pressure that broken aperture is locally filled with formula occurs for the local wedge angle of grain, is optimal compression.Now transmitance RDAbout 0.07 is left
It is right.Flow by the unit interval of activated carbon plate is Q, and the viscosity of fluid is μ, and the flow section product of meeting of activated carbon plate is A,
Thickness is L, and the pressure loss is Δ P, then is by the mean flow rate μ of one piece of activated carbon plate：
In formula：Q --- pass through the flow m of the unit interval of activated carbon plate3/s
A --- activated carbon plate meets flow section product m2
Δ P --- pass through the pressure loss Pa of activated carbon plate
μ --- pass through the viscosity Pas of activated carbon fluid
The thickness m of L --- activated carbon plate
SV--- the volumetric surface area m of active particle2/m3
SV——ρPSw
ρP--- the density Kg/m of particle2
Sw--- the powder surface product m of unit mass2/kg
ε --- voidage
3rd, activated carbon plate pattern and path combination：
Example 1：Plate thickness 50mm, from the more herringbone waves 1 (see Fig. 2) of horizontal mitre, the high 30mm of ripple or so, the pitch of waves
80mm.The pressure that (see Fig. 3) is used for coal bed gas is 0.05MPa (G).Coal bed gas is by the corner apertures 3 on plate, in plate and plate
Between surface flowed, not only carried out heat and mass but also carried out absorption CH4, also with gas permeability, allow N2、O2、H2O、H2、CO2Ooze
Cross and enter downstream.Containing CH4The surface that relatively low coal bed gas enters between the plate and plate of downstream is flowed, then
Heat and mass is carried out, adsorbed, oozed and enter back into downstream.Finally contain CH4Coal bed gas of the ＜ below 5%, flowed into by exporting
Emptying system discharges：CH4Adsorbed by activated carbon plate, make CH by vacuumizing4Desorb, it is possible to obtain CH4Purity 90%
Natural gas above.
Using single channel, two backflow, series-parallel connection form path combination, the pressure available for coal bed gas is 0.05MPa (G)
(see Fig. 5).
It is back to the port of export 5 (see Fig. 5) coal bed gas is led to arrival end 6 using the corner apertures 3 (see Fig. 2) on plate when one
(see Fig. 5), start second flow until being discharged from outlet.So between two plates, certain pressure differential is formed, is helped
In giving full play to molecular sieve function；Be advantageous to physical absorption and desorption.
Example 2：Plate thickness is 80mm, and from horizontal mitre herringbone wave 1 (see Fig. 2), wave height position 30mm or so, the pitch of waves is
90mm (see Fig. 4), the pressure for coal bed gas are 0.4MPa (G).
Using single channel, two backflow, cascade path combination, available for coal bed gas pressure for 0.4MPa (G) (see
Fig. 6).
It is back to the port of export 7 (see Fig. 6) coal bed gas is led to arrival end 8 using the corner apertures 3 (see Fig. 2) on plate when one
(see Fig. 6), start second flow until being discharged from outlet.So between two plates, certain pressure differential is formed, is helped
In giving full play to molecular sieve function, be advantageous to physical absorption and desorption.
4th, the overall structure of coal bed gas purifying plant：
Using dismountable plate type heat exchanger structure, the activated carbon formed by compacting has the plate of horizontal mitre herringbone wave
1 (see Fig. 2), as adsorbent bed and molecular sieve, alternating discharge, every plate have pad to be enclosed at seal groove 2 at regular intervals
Blending bolt is pressed in framework.There is corner apertures 3 on the angle of plate, coal bed gas is from access road, by single channel, two backflows, series-parallel connection
Or the flow of cascade, it is assigned in the runner between each plate, CH4It is adsorbed：N2、O2、H2O、H2、CO2It is discharged.
Framework is upper and lower to be surrounded by dismountable stainless steel plate, a closed box (see Fig. 7) is formed, in active carbon slab
Between block and casing, form one and be full of with N2For the separate cavities of predominant gas, prevent from being collided by external force.The import of purifying plant
Flange 11, outlet(discharge) flange 9 expose.Automatic blow off valve valve air relief 10 is provided with closed box top.
Embodiment
The tolerance of underground coal mine extraction coal bed gas is 60m3/ m, the methane content of coal bed gas is 30%-10%, and oneself has perfect
Coal bed gas extraction and exhaust system.Now to set up a set of coal bed gas purifying plant and system.
1st, the design of coal bed gas purifying plant：
Adsorbent bed accounts for 71.7% using a diameter of dp=2mm of bulky grain activated carbon, little particle activated carbon it is a diameter of
After 0.5mm accounts for 28.3% ratio accumulation, the activated carbon plate adsorbent bed that is pressed into, its a width of 1.5 meters, a height of 2.5 meters, thickness be
80mm (see Fig. 2), using laterally 120 ° of more herringbone waves of angle, wave height 28mm, pitch of waves 90mm (see Fig. 4).Lived again after compressing
Change, its air penetrability shares 52 pieces of activated carbon blocks composition for 0.09-0.05 between, using single channel, two flows back, cascade
Path combination (see Fig. 6).The port of export 7 is back to when one, using the corner apertures on plate, coal bed gas is led to arrival end 8, starts the
Two flows, until being discharged from exit.Certain pressure is formed between activated carbon plate between a flow and second procedure
Difference, give full play to molecular sieve function；Be advantageous to physical absorption and desorption.
2nd, the overall structure of coal bed gas purifying plant：
Using the frame structure of plate type heat exchanger, in addition to plate uses activated carbon plate, remaining part all with plate-type heat-exchange
The member principle of device is identical.There are fixed pressure plate, movable pressure plate, pillar, upper lower guide rod, fishbolt to form whole framework.
Between fixed pressure plate and movable pressure plate, activated carbon plate is installed, sealing gasket, active carbon slab are provided between activated carbon plate
Guide groove 4 (see Fig. 2) is had on block to determine between two pressure strips the position of activated carbon plate by upper and lower guide rod,
It is fixed by fishbolt.The corner apertures 3 (see Fig. 2) that coal bed gas enters activated carbon plate through the flange hole on fixed pressure plate flows
Enter plate herringbone ripple.Runner is formed by the path combination (see Fig. 6) of single channel, two backflows, cascade.Coal bed gas is in each stream
In road, molecular sieve function and physical absorption and desorption are given full play to.＜ containing CH4 5% coal bed gas flow to activity from second procedure
Flange hole 11 (see Fig. 7) on pressure strip namely the outlet of purifying plant, into discharge pipe network emptying.
Fixed pressure plate, movable pressure plate, pillar can serve as the placement pin 12 (see Fig. 7) of coal bed gas purifying plant,
It is fixed on concrete pedestal.
One dismountable stainless steel plate, composition closed box are surrounded by fixed pressure plate and the upper and lower of pillar.Enter
Mouth flange 11, outlet(discharge) flange 9 expose (see Fig. 7).Two automatics blow off valve valve air relief 10 are provided with casing top.
3rd, coal bed gas purification system (see Fig. 8)：
On the premise of former underground extraction coal bed gas, discharge coalbed methane system and function is retained, compressed in extraction coal bed gas
The exit of machine 17, a set of coal bed gas purifying plant 13 is installed.The outlet of system is connected with the system of former high-level discharging coal bed gas,
To discharge CH4Content is less than 5% low concentration coal-bed gas.
In the exit of every coal bed gas purifying plant 13, the import all with vavuum pump 16 is connected, adsorbed for desorbing
CH4, by the outlet of vavuum pump 16 CH4Coal bed gas (CH after purification4Volume fraction more than 90%) be sent into CH4Pipeline.
It so both can guarantee that former extraction, the function of exhaust system were constant.And can purifies coal bed gas, obtains the CH of high concentration4, reduce air
Pollution.
A set of coal bed gas purification system, it can be made up of two sets of (or three sets) coal bed gas purifying plants 13.Two covering devices enter
Outlet and company of the mouth with extraction coal seam compressor 17, the import and export per covering device install a set of pneumatic switching valve 14, Yi Gongsi
Individual pneumatic operated valve 14.When a coal bed gas purifying plant is adsorbed, its import and the outlet of extraction coal bed gas compressor 17
Communicate, its outlet communicates with discharging the system of coal bed gas, and import and export switching valve 14 is all in opening.Another coal seam
Gas purifying plant is desorbed, and its import and export switching valve 14 is all in closed mode.In the outlet of coal bed gas purifying plant 13
It is connected between place and switching valve 14 provided with connecting tube with the import of vavuum pump 16.Pneumatic gate valve 15 is installed in connecting tube, when
When vavuum pump 16 is opened, Pneumatic gate valve 15 is in opening, and negative pressure, CH are just formed in coal bed gas purifying plant 134Just therefrom
Desorb, the CH of 90% concentration is obtained with by the exit of vavuum pump 164Gas, it is sent into CH4Pipe network.
A set of coal bed gas purification system can also use three sets of coal bed gas purifying plants 13.The import and extraction of three covering devices
The outlet of coal bed gas compressor and company, the import and export per covering device fill a set of pneumatic switching valve, altogether six pneumatic switchings
Valve.One coal bed gas purifying plant is adsorbed, and another coal bed gas purifying plant is desorbed, and also one oneself completion is adsorbed
It is prepared to enter into desorption.Purify the CH obtained4Gas, it is possible to input CH incessantly4Pipeline.
Often metal material used by set coal bed gas purification system, all from stainless steel.Prevent from being collided by external force and fire occurs
Flower.
Coal bed gas purifying plant is often covered, will be grounded, prevent electrostatic；The ground connection of whole coal bed gas purification system, should be linked to be
One pipe network.
The above embodiments merely illustrate the technical concept and features of the present invention, and its object is to allow person skilled in the art
Scholar can understand present disclosure and implement according to this, and it is not intended to limit the scope of the present invention.It is all according to the present invention
The equivalent change or modification that Spirit Essence is made, it should all be included within the scope of the present invention.
Claims (17)
- A kind of 1. coal bed gas purifying plant, it is characterised in that：The purifying plant includes multiple adsorption plates and pacified for fixed The framework of the adsorption plate is filled, multiple adsorption plates are spaced and sealed between adjacent two adsorption plates, form coal supply layer The runner of air-flow warp, the opposite end of the framework have the air inlet connected with the both ends of the runner and gas outlet respectively, The adsorption plate has molecular sieve function, its can selective absorption methane and molecular volume in coal bed gas can be made to be less than methane Gas molecule pass through.
- 2. coal bed gas purifying plant according to claim 1, it is characterised in that：The adsorption plate is suppressed by activated carbon granule Activation is carried out after shaping to be made.
- 3. coal bed gas purifying plant according to claim 2, it is characterised in that：Form the activated carbon granule of the adsorption plate With more than two kinds diameters, and the activated carbon granule of two kinds of diameter above is used in the ratio for forming most dense packing.
- 4. coal bed gas purifying plant according to claim 3, it is characterised in that：Form the activated carbon granule of the adsorption plate With two kinds, wherein set a diameter of Dp of larger bulky grain, less small particle diameters are 0.2Dp-0.3Dp, larger big The accounting of grain activated carbon and less little particle activated carbon is respectively 71.7% and 28.3%.
- 5. coal bed gas purifying plant according to claim 3, it is characterised in that：Form the activated carbon granule of the adsorption plate With more than three kinds, the activated carbon granule requires to design according to Horsfield closestpackings.
- 6. coal bed gas purifying plant according to claim 2, it is characterised in that：It is described compressing including procedure below： Activated carbon granule is placed in mould, first applies first pressure and carries out first stage compression, grain density is reached tap density, Then apply second pressure and carry out second stage compression, make stratum granulosum further closely knit, wherein second pressure is more than first pressure, In the presence of second pressure, a certain degree of broken, subparticle hair occurs for activated carbon granule part wedge angle and protruding parts The forced penetration flowing of raw irreversibility, and be filled in less space.
- 7. coal bed gas purifying plant according to claim 1, it is characterised in that：The adsorption plate is herringbone corrugated plating.
- 8. coal bed gas purifying plant according to claim 7, it is characterised in that：The herringbone ripple edge absorption of the adsorption plate The cross direction profiles arrangement of plate.
- 9. the coal bed gas purifying plant according to claim 7 or 8, it is characterised in that：The thickness of the adsorption plate is 40- 100mm, ripple a height of 25-40mm, pitch of waves 70-120mm.
- 10. coal bed gas purifying plant according to claim 1, it is characterised in that：The coal bed gas purifying plant is using single Runner, more backflow, the path combination of series-parallel connection form or single channels, more backflows, the path combination of cascade.
- 11. coal bed gas purifying plant according to claim 1, it is characterised in that：The framework includes fixed pressure plate, work Dynamic pressure strip, pillar, upper lower guide rod and fishbolt, described multiple adsorption plates be uprightly arranged on the fixed pressure plate with Between movable pressure plate, corner apertures is provided with the angle of the adsorption plate, the upper and lower part of described adsorption plate is respectively equipped with Guide groove, the position of adsorption plate is determined between the fixed pressure plate and movable pressure plate by upper and lower guide rod, by clamping Bolt presses are fixed, and flange hole, the fixed pressure plate, work are respectively arranged with described fixed pressure plate, movable pressure plate Flange hole on dynamic pressure strip respectively constitutes the air inlet and gas outlet.
- 12. coal bed gas purifying plant according to claim 11, it is characterised in that：It is provided with the framework surrounding removable The stainless steel plate unloaded, to form a closed box, wherein the flange hole exposes, shape between the casing and the adsorption plate Into there are separate cavities, it is used to fill nitrogen in the isolated chambers, automatic blow off valve valve air relief is provided with the casing top.
- A kind of 13. coal bed gas purification system, it is characterised in that：Described coal bed gas purification system includes such as claim 1 to 12 Any one of coal bed gas purifying plant and vavuum pump described in claim, the air inlet of described coal bed gas purifying plant with The compressor connection of extraction coal seam, the gas outlet of the coal bed gas purifying plant are connected with the import of the vavuum pump, the vacuum The outlet of pump is connected with methane pipeline.
- 14. coal bed gas purification system according to claim 13, it is characterised in that：Described coal bed gas purification system includes 2,3 or more the coal bed gas purifying plants, the air inlet of the multiple coal bed gas purifying plant and the extraction coal The outlet of layer compression machine and company, and it is separately installed with pneumatic switching in the inlet end of each coal bed gas purifying plant and outlet side Valve, connecting tube and vacuum are respectively equipped between the gas outlet of each coal bed gas purifying plant and the pneumatic switching valve of outlet side The import connection of pump, Pneumatic gate valve is provided with described connecting tube.
- A kind of 15. method of purification of underground extraction coal bed gas, it is characterised in that：Methods described is used such as the institute of claim 13 or 14 The coal bed gas purification system stated carries out the purification of underground extraction coal bed gas, and it comprises the following steps：The absorption purification of coal bed gas：The extraction coal seam atmospheric pressure of extraction coal seam compressor conveying is set to be delivered to the coal bed gas purification In device, in the coal bed gas purifying plant, surface flow of the coal bed gas between adsorption plate and adsorption plate, both carried out Heat and mass adsorbed methane again, and allow other molecular volumes in coal bed gas to be less than the gas molecule of methane and oozed into lower one stream Journey, the surface entered containing the relatively low coal bed gas of methane between the adsorption plate and adsorption plate of downstream is flowed, then is passed Hot mass transfer, adsorb, oozed and enter back into downstream, last methane content is less than 5% coal bed gas, passes through gas outlet and flows into emptying System is discharged, and methane is adsorbed plate absorption；The parsing of methane：Vavuum pump is opened, is desorbed by vacuumizing the methane for adsorbing adsorbed plate, obtains methane purity More than 90% natural gas.
- 16. method of purification according to claim 15, it is characterised in that：The coal bed gas purifying plant is 2, thereto A coal bed gas purifying plant be sent into coal bed gas carry out coal bed gas absorption purification while, using vavuum pump to another Coal bed gas purifying plant vacuumizes the parsing for carrying out methane.
- 17. method of purification according to claim 15, it is characterised in that：The coal bed gas purifying plant is 3, thereto A coal bed gas purifying plant be sent into coal bed gas carry out coal bed gas absorption purification while, using vavuum pump to another Coal bed gas purifying plant vacuumizes the parsing for carrying out methane, while also a coal bed gas purifying plant completes the absorption of coal bed gas Purification is prepared to enter into the parsing of methane.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710965953.5A CN107617307A (en) | 2017-10-17 | 2017-10-17 | It is a kind of to there is molecular sieve function and using physical absorption and the coal bed gas purifying plant and technique of desorption principle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710965953.5A CN107617307A (en) | 2017-10-17 | 2017-10-17 | It is a kind of to there is molecular sieve function and using physical absorption and the coal bed gas purifying plant and technique of desorption principle |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107617307A true CN107617307A (en) | 2018-01-23 |
Family
ID=61092642
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710965953.5A Pending CN107617307A (en) | 2017-10-17 | 2017-10-17 | It is a kind of to there is molecular sieve function and using physical absorption and the coal bed gas purifying plant and technique of desorption principle |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107617307A (en) |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20000040605A (en) * | 1998-12-18 | 2000-07-05 | 이구택 | Method for removing methane gas using activated carbon |
| CN101653721A (en) * | 2009-09-15 | 2010-02-24 | 重庆大学 | Preparation method of coal-based granular activated carbon with molecular sieving effect and application thereof in pressure-transformation adsorption and separation concentrated gas |
| CN101935032A (en) * | 2010-09-03 | 2011-01-05 | 同济大学 | Preparation method and use of carbon molecular sieve |
| CN101955825A (en) * | 2010-08-18 | 2011-01-26 | 煤炭科学研究总院 | Method for concentrating and separating methane in deoxidized coal bed gas |
| CN102380285A (en) * | 2011-10-11 | 2012-03-21 | 北京科技大学 | Multi-tower vacuum pressure swing adsorption based method and apparatus for concentrating coal mine ventilation air methane |
| US20130225898A1 (en) * | 2010-11-15 | 2013-08-29 | Exxonmobil Upstream Research Company | Kinetic Fractionators, and Cycling Processes for Fractionation of Gas Mixtures |
| CN103877930A (en) * | 2014-03-13 | 2014-06-25 | 范晓红 | Corrugated plate-shaped adsorption material and preparation method thereof |
| CN203829871U (en) * | 2014-04-24 | 2014-09-17 | 湖北超越环保设备有限公司 | Activated carbon adsorption tower |
| CN105879612A (en) * | 2014-12-02 | 2016-08-24 | 张江龙 | Deodorization device for processing center |
-
2017
- 2017-10-17 CN CN201710965953.5A patent/CN107617307A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20000040605A (en) * | 1998-12-18 | 2000-07-05 | 이구택 | Method for removing methane gas using activated carbon |
| CN101653721A (en) * | 2009-09-15 | 2010-02-24 | 重庆大学 | Preparation method of coal-based granular activated carbon with molecular sieving effect and application thereof in pressure-transformation adsorption and separation concentrated gas |
| CN101955825A (en) * | 2010-08-18 | 2011-01-26 | 煤炭科学研究总院 | Method for concentrating and separating methane in deoxidized coal bed gas |
| CN101935032A (en) * | 2010-09-03 | 2011-01-05 | 同济大学 | Preparation method and use of carbon molecular sieve |
| US20130225898A1 (en) * | 2010-11-15 | 2013-08-29 | Exxonmobil Upstream Research Company | Kinetic Fractionators, and Cycling Processes for Fractionation of Gas Mixtures |
| CN102380285A (en) * | 2011-10-11 | 2012-03-21 | 北京科技大学 | Multi-tower vacuum pressure swing adsorption based method and apparatus for concentrating coal mine ventilation air methane |
| CN103877930A (en) * | 2014-03-13 | 2014-06-25 | 范晓红 | Corrugated plate-shaped adsorption material and preparation method thereof |
| CN203829871U (en) * | 2014-04-24 | 2014-09-17 | 湖北超越环保设备有限公司 | Activated carbon adsorption tower |
| CN105879612A (en) * | 2014-12-02 | 2016-08-24 | 张江龙 | Deodorization device for processing center |
Non-Patent Citations (1)
| Title |
|---|
| 席芳: "变压吸附分离煤层气中甲烷/氮混合气的实验研究", 《中国优秀硕士学位论文全文数据库 工程科技Ⅰ辑》, pages 13 - 44 * |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JPH05146624A (en) | Method for separation by adsorption and adsorbing device | |
| CN109319740A (en) | A kind of swing adsorption oxygen generating system improving adsorbent productivity | |
| CN211733852U (en) | Pressure swing adsorption oxygen generating device | |
| CN108236829A (en) | From containing CO2Separating high-purity CO in unstripped gas2Method and device | |
| CN2875568Y (en) | Pressure change adsorption gas separation device | |
| CN207313548U (en) | A kind of purifying plant and purification system for underground extraction coal bed gas | |
| CN107617307A (en) | It is a kind of to there is molecular sieve function and using physical absorption and the coal bed gas purifying plant and technique of desorption principle | |
| CN104275069A (en) | Decompression-type variable-temperature adsorption process and device | |
| CN105013290A (en) | Adsorption tower carbon molecular sieve layering filling process | |
| CN201031144Y (en) | Coal mine down-hole mobile carbon molecular sieve nitrogen preparing equipment | |
| CN110394026A (en) | Extensive pressure-variable adsorption step air-separating plant | |
| CN206867940U (en) | Adsorbing tower with molecular sieve | |
| CN207805324U (en) | A kind of interior circulation variable pressure adsorption type hydrogen clarifier | |
| CN104275068B (en) | Supercharging temperature swing adsorption process and device | |
| CN2789220Y (en) | Coal mine underground carbon molecular sieve nitrogen-making main machine | |
| CN108236830A (en) | Pressure swing adsorption gas separation device | |
| CN100363086C (en) | Pressure swing absorption method for preparing nitrogen from air | |
| CN204073782U (en) | A kind of decompression type temperature swing absorption unit | |
| CN103868346A (en) | Oxygen-enriched nitrogen supply system for cupola furnace | |
| CN208512200U (en) | It is a kind of based on product gas methane displacement coal bed gas deoxidation denitrogenate enrichment facility | |
| CN2889461Y (en) | Three-tower variable-pressure gas adsorbing separator | |
| CN203498079U (en) | Device for preparing oxygen from air | |
| CN204073784U (en) | A kind of booster-type temperature swing absorption unit | |
| CN104275071B (en) | Outlet supercharging temperature swing adsorption process and device | |
| CN206304538U (en) | From containing CO2Separating high-purity CO in unstripped gas2Device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| CB03 | Change of inventor or designer information |
Inventor after: Jia Anquan Inventor after: Dai Yeting Inventor after: Li Maode Inventor before: Jia Anquan |
|
| CB03 | Change of inventor or designer information |