CN110237657A - Separation device and method for carbon dioxide/methane mixed gas - Google Patents
Separation device and method for carbon dioxide/methane mixed gas Download PDFInfo
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- CN110237657A CN110237657A CN201910452325.6A CN201910452325A CN110237657A CN 110237657 A CN110237657 A CN 110237657A CN 201910452325 A CN201910452325 A CN 201910452325A CN 110237657 A CN110237657 A CN 110237657A
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- carbon dioxide
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/007—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by irradiation
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/22—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by diffusion
- B01D53/228—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by diffusion characterised by specific membranes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/22—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by diffusion
- B01D53/229—Integrated processes (Diffusion and at least one other process, e.g. adsorption, absorption)
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
- C10L3/00—Gaseous fuels; Natural gas; Synthetic natural gas obtained by processes not covered by subclass C10G, C10K; Liquefied petroleum gas
- C10L3/06—Natural gas; Synthetic natural gas obtained by processes not covered by C10G, C10K3/02 or C10K3/04
- C10L3/10—Working-up natural gas or synthetic natural gas
- C10L3/101—Removal of contaminants
- C10L3/102—Removal of contaminants of acid contaminants
- C10L3/104—Carbon dioxide
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2256/00—Main component in the product gas stream after treatment
- B01D2256/24—Hydrocarbons
- B01D2256/245—Methane
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/50—Carbon oxides
- B01D2257/504—Carbon dioxide
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2259/00—Type of treatment
- B01D2259/80—Employing electric, magnetic, electromagnetic or wave energy, or particle radiation
- B01D2259/814—Magnetic fields
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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
- Y02C—CAPTURE, STORAGE, SEQUESTRATION OR DISPOSAL OF GREENHOUSE GASES [GHG]
- Y02C20/00—Capture or disposal of greenhouse gases
- Y02C20/40—Capture or disposal of greenhouse gases of CO2
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- Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- General Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Organic Chemistry (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
Abstract
The invention belongs to the technical field of gas separation and purification, and particularly relates to a separation device and a separation method for carbon dioxide/methane mixed gas, which comprises a mixed gas inlet conduit, wherein one end of the mixed gas inlet conduit is connected with a mixed gas steel cylinder and an air pump, the other end of the mixed gas inlet conduit is connected with one end of a three-way pipe, the other two ends of the three-way pipe are respectively connected with a carbon dioxide outlet conduit and a methane outlet conduit, a molecular sieve membrane is arranged in the carbon dioxide outlet conduit, a cylindrical permanent magnet device is arranged outside the three-way pipe, the S pole of the cylindrical permanent magnet device is close to one end of the carbon dioxide outlet conduit, and the N pole of the cylindrical permanent magnet device is close to one end of the methane outlet conduit. Thereby reducing the concentration gradient on the surface of the membrane and weakening the concentration polarization phenomenon.
Description
Technical field
The invention belongs to gas separation and purification technical fields, and in particular to a kind of carbon dioxide/methane mixed gas
Separator and method.
Background technique
In gas extraction and transportational process, it is usually mixed with carbon dioxide gas, if being unable to carbon dioxide removal
, it will the quality of natural gas is influenced, and often will cause corrosive pipeline, and the combustion heat value of natural gas can be reduced.Mesh
Before, the whole world about produces 1.42*10 every year12m3Natural gas, although the composition various regions of raw gas are all different, first
Alkane is main component, and in addition there are also many impurity, such as carbon dioxide, hydrogen sulfide etc., document [Shen Jiangnan, immobilized faciliated diffusions [D]
Hangzhou: Zhejiang University's Chemical Engineering and Technology, 2005] solvent absorption is reported, it is primarily referred to as utilizing absorbing liquid and titanium dioxide
Carbon chemically reacts, these absorbing liquids have stronger absorbability under normal circumstances, can dissolve a large amount of carbon dioxide gas
Body, it is possible to carbon dioxide be absorbed and separated.But this method is frequently accompanied by absorption tower and blisters, carries secretly etc.
Phenomenon consumes big energy.Document [separation of Yuan Wenfeng membrane contactor, the Hangzhoupro research [D] for recycling carbon dioxide in flue gas
State: Zhejiang University's Chemistry and Physics of Polymers, 2004] absorption method is reported, technological principle is then using various adsorbents pair
The difference of the separation selectivity of carbon dioxide is removed, this method is that a reversible process is still separated with absorption method
Carbon dioxide removal needs a large amount of adsorbent, causes cost bigger, and adsorption-desorption is frequent, and the degree of automation requires high.Document
[Ren Baozeng, Li Aiqin, Li Yu, carbon dioxide, the Henan methane separation Review On Process [J] chemical industry, 2002,4:7-8.] reports
Electrochemical process etc. proposes that the raw material of this film is molten using battery membranes separation removal carbon dioxide from the air of flight capsule earliest
Melt carbonate, electrochemical process separation carbon dioxide has also the drawback that.Fused carbonate is mostly the corrosive medium of paste, because this
Substance has extremely strong corrosivity at high temperature, so causing this electrochemical membrane to be not easy to prepare, and in operating process all
It is extremely difficult, it is unfavorable for applying on a large scale.Secondly, sulfur dioxide can be because of chemical change pair under high-temperature flue gas environment
Battery damages, and generates sulfate, be easy to cause corrosion.Physical Absorption method is under high pressure with strong organic of solubility property
Solvent, which absorbs carbon dioxide gas, carrys out separation removal carbon dioxide.But it can only be higher in carbon dioxide gas partial pressure
In the case where be applicable in, and it is not high with the removal rate of Physical Absorption method separation removal carbon dioxide.Document [Su Yi, Hu Liang, Liu
Scheme is contained, gas membrane Seperation Technology and its apply [J] oil and gas .2001,30(3): 113-118.] to report embrane method de-
Removing carbon dioxide is a kind of emerging separation method, but concentration polarization is particularly important influence factor in UF membrane.Concentration difference
Polarization refers to in membrane separating process, and in the fast component of feed side infiltration rate, film is preferentially penetrated under the driving of motive force,
Remaining component is accumulated in feed side by seperation film obstruction, these components being trapped are constantly long-pending between film surface and material flow
It is tired, there is concentration gradient, due to concentration gradient, causes other components to raw material flow bulk diffusion, form concentration gradient boundary
Layer, the presence in boundary layer increase partial fluid resistance, and the component permeation flux for causing infiltration rate fast is reduced.It is dense when occurring
When poor polarization phenomena, the beds of precipitation are more likely formed, makes the transfer performance of film so that separating property declines, affects UF membrane dress
The task performance set.During industrial operation, this will improve economic cost, so that bring more serious result.
Summary of the invention
For above-mentioned problems of the prior art and deficiency, the present invention provides a kind of carbon dioxide/methane mixed gas
The separator of body.
It is a further object of the present invention to provide a kind of using carbon dioxide/methane mixed gas separator to titanium dioxide
Carbon/methane mixed gas separation method.
To achieve the above object, the invention provides the following technical scheme:
A kind of separator of carbon dioxide/methane mixed gas, the separator include mixed gas entry conductor, are mixed
The one end for closing gas inlet duct is connected with mixed gas steel cylinder and air pump, and the mixed gas entry conductor other end is connected with three
The other both ends of one end of siphunculus, tee tube are connected separately with carbon dioxide outlet conduit and methane outlet conduit, carbon dioxide
It is equipped with molecular screen membrane in delivery channel, is equipped with tubular permanent magnetic device on the outside of tee tube, the S of tubular permanent magnetic device is extremely close to titanium dioxide
Carbon delivery channel one end, the N of tubular permanent magnetic device is extremely close to methane outlet tube at one end.
Further, the length of the tubular permanent magnetic device is 0.7-1.5m, magnetic field strength 4.0-5.5T.
Further, the pressure that the air pump provides is 0.3-0.5MPa.
It is a kind of using carbon dioxide/methane mixed gas separator to the separation of carbon dioxide/methane mixed gas
Method, the separation method specifically follow the steps below:
Step 1: will equipped be configured to certain density carbon dioxide connect with the steel cylinder of methane mixed gas spinner flowmeter with
Then regulating valve is connect with mixed gas entry conductor；
Step 2: being separately connected carbon dioxide and methane caching storage tank in carbon dioxide outlet conduit and methane outlet conduit, then
It adjusts regulating valve and allows mixed gas to enter in tee tube in conjunction with spinner flowmeter；
Step 3: mixed gas under conditions of 25 DEG C of temperature, magnetic field strength 4.0-5.5T after tubular permanent magnetic device, dioxy
Change carbon gas to be collected after molecular screen membrane enters carbon dioxide outlet conduit, methane gas is then directly entered methane outlet and leads
It is collected after pipe.
Compared with prior art, the beneficial effects of the present invention are:
The present invention is equal to the magnetic susceptibility of its molecule multiplied by the magnetic field in the magnetic field using the power that gas molecule is subject under magnetic fields
Intensity and magnetic field gradient, since the magnetic susceptibility of the relative oxygen of methane gas is+0.68, carbon dioxide is strong diamagnetism gas,
Its relative oxygen magnetic susceptibility is -0.57.So magnetic field gradient power is formed using the magnetic contrast of carbon dioxide and methane, magnetic field
Gradient force promotes carbon dioxide quickly to move to the direction opposite with magnetic induction line, on the one hand forms a kind of pressure to methane gas,
Promote methane to move along magnetic induction line direction, on the other hand utilizes the magnetic field gradient power that methane and carbon dioxide are subject in magnetic field
Difference, the two synergy will realize the initial gross separation of carbon dioxide and methane, to reduce concentration gradient when UF membrane, enhance
The transfer performance of film is down to separating property, and gas moves the effect that can play atomization and acceleration in magnetic field, can play drop
Low viscosity and increase movement velocity, can further decrease concentration polarization, improve the separation factor and methane gas of carbon dioxide
Purity, be compared with the traditional method, have many advantages, such as process be simple and efficient, be energy saving, good separating effect.
Detailed description of the invention
Fig. 1 is the structural diagram of the present invention.
In figure: 1. mixed gas entry conductors, 2. mixed gas steel cylinders, 3. air pumps, 4. tee tubes, 5. carbon dioxide go out
Mouth conduit, 6. methane outlet conduits, 7. molecular screen membranes, 8. tubular permanent magnetic devices.
Specific embodiment
The following describes the present invention in detail with reference to the accompanying drawings and specific embodiments.
As shown in the picture, a kind of separator of carbon dioxide/methane mixed gas, the separator include mixing
Gas inlet duct 1, one end of mixed gas entry conductor 1 are connected with mixed gas steel cylinder 2 and air pump 3, and mixed gas enters
Mouth 1 other end of conduit is connected with one end of tee tube 4, and the other both ends of tee tube 4 are connected separately with carbon dioxide outlet conduit 5
With methane outlet conduit 6, carbon dioxide outlet conduit 5 is interior to be equipped with molecular screen membrane 7, is equipped with tubular permanent magnetic device on the outside of tee tube 4
8, the S of tubular permanent magnetic device 8 are extremely close to 5 one end of carbon dioxide outlet conduit, and the N of tubular permanent magnetic device 8 is extremely close to methane outlet
6 one end of conduit, the length of tubular permanent magnetic device 8 are 0.7-1.5m, magnetic field strength 4.0-5.5T, the pressure that air pump 3 provides
For 0.3-0.5Mpa.
The present invention it is a kind of using carbon dioxide/methane mixed gas separator to carbon dioxide/methane mixed gas
Isolated method, the separation method specifically follow the steps below:
Step 1: will equipped be configured to certain density carbon dioxide connect with the steel cylinder of methane mixed gas spinner flowmeter with
Then regulating valve is connect with mixed gas entry conductor 1；
Step 2: being separately connected carbon dioxide and methane caching storage tank in carbon dioxide outlet conduit 5 and methane outlet conduit 6, so
After adjust regulating valve, in conjunction with spinner flowmeter, mixed gas is allowed to enter in tee tube 4；
Step 3: mixed gas under conditions of 25 DEG C of temperature, magnetic field strength 4.0-5.5T after tubular permanent magnetic device 8, dioxy
Change carbon gas to be collected after molecular screen membrane 7 enters carbon dioxide outlet conduit 5, methane gas is then directly entered methane outlet
It is collected after conduit 6.
Comparative example 1
First spinner flowmeter and tune will be connected with the steel cylinder of methane mixed gas equipped with being configured to certain density carbon dioxide
Valve is saved, is then connect with mixed gas entry conductor 1, is separately connected two in carbon dioxide outlet conduit 5 and methane outlet conduit 6
Carbonoxide and methane cache storage tank, then adjust regulating valve, in conjunction with spinner flowmeter, mixed gas are allowed to enter in tee tube 4, mix
It closes in gas, it is 0.3MPa in raw gas pressure that the volume fraction of methane, which is 0.6, and seeping remaining phase flow rate is 400mL/min, temperature
Degree is 25 DEG C, magnetic field strength 0T, and the aperture of molecular screen membrane carries out detached job, result CO under conditions of being 0.35nm2's
Infiltration rate is 1.8*10-5cm3/cm2MinPa, the separation factor of methane are 1.05.
Comparative example 2
First spinner flowmeter and tune will be connected with the steel cylinder of methane mixed gas equipped with being configured to certain density carbon dioxide
Valve is saved, is then connect with mixed gas entry conductor 1, is separately connected two in carbon dioxide outlet conduit 5 and methane outlet conduit 6
Carbonoxide and methane cache storage tank, then adjust regulating valve, in conjunction with spinner flowmeter, mixed gas are allowed to enter in tee tube 4, mix
It closes in gas, it is 0.3MPa in raw gas pressure that the volume fraction of methane, which is 0.6, and seeping remaining phase flow rate is 400mL/min, temperature
Degree is 25 DEG C, magnetic field strength 2T, and the aperture of molecular screen membrane carries out detached job, result CO under conditions of being 0.35nm2's
Infiltration rate is 2.5*10-5 cm3/cm2MinPa, the separation factor of methane are 1.28.
Embodiment 1
First spinner flowmeter and tune will be connected with the steel cylinder of methane mixed gas equipped with being configured to certain density carbon dioxide
Valve is saved, is then connect with mixed gas entry conductor 1, is separately connected two in carbon dioxide outlet conduit 5 and methane outlet conduit 6
Carbonoxide and methane cache storage tank, then adjust regulating valve, in conjunction with spinner flowmeter, mixed gas are allowed to enter in tee tube 4, mix
It closes in gas, it is 0.3MPa in raw gas pressure that the volume fraction of methane, which is 0.6, and seeping remaining phase flow rate is 400mL/min, temperature
Degree is 25 DEG C, magnetic field strength 4.0T, and the aperture of molecular screen membrane carries out detached job, result CO under conditions of being 0.35nm2
Infiltration rate be 4.5*10-5cm3/cm2MinPa, the separation factor of methane are 1.50.
Embodiment 2
Embodiment 2 and the experimental condition parameter of embodiment 1 are essentially identical, and in mixed gas, the volume fraction of methane is 0.6,
Raw gas pressure is 0.4MPa, and seeping remaining phase flow rate is 400mL/min, and temperature is 25 DEG C, magnetic field strength 4.5T, molecular screen membrane
Aperture be 0.35nm, as a result CO2Infiltration rate be 4.2*10-5cm3/cm2MinPa, the separation factor of methane
It is 1.48.
Embodiment 3
Embodiment 3 and the experimental condition parameter of embodiment 1 are essentially identical, only difference is that magnetic field strength is 5.5T, mix
It closes in gas, it is 0.5MPa in raw gas pressure that the volume fraction of methane, which is 0.6, and seeping remaining phase flow rate is 400mL/min, temperature
Degree is 25 DEG C, magnetic field strength 5.5T, and the aperture of molecular screen membrane is 0.35nm, as a result CO2Infiltration rate be 4.6*
10-5cm3/cm2MinPa, the separation factor of methane are 1.42.
The result of embodiment 1-3 is drawn a conclusion compared with comparative example 1-2 to be shown under equal conditions, the infiltration of carbon dioxide
Rate and the separation factor of methane increase with the raising of magnetic field strength, therefore deduce that, by methane and carbon dioxide
Mixed gas is placed in the magnetic treatment separator that magnetic field strength is 4.0-5.5 T, is illustrated after applying magnetic field, is improved titanium dioxide
Carbon reduces the concentration difference boundary layer thickness of film surface in the flow velocity of film surface, and can by the precipitating particle of film surface or
Other impurities removing weakens concentration polarization phenomenon, to improve carbon dioxide and first to reduce the concentration gradient of film surface
The separative efficiency of alkane.
Claims (4)
1. a kind of separator of carbon dioxide/methane mixed gas, which is characterized in that the separator includes gaseous mixture
Body entry conductor (1), one end of mixed gas entry conductor (1) are connected with mixed gas steel cylinder (2) and air pump (3), mixing
Gas inlet duct (1) other end is connected with one end of tee tube (4), and the other both ends of tee tube (4) are connected separately with dioxy
Change carbon delivery channel (5) and methane outlet conduit (6), is equipped with molecular screen membrane (7) in carbon dioxide outlet conduit (5), tee tube
(4) outside is equipped with tubular permanent magnetic device (8), and the S of tubular permanent magnetic device (8) is extremely close to carbon dioxide outlet conduit (5) one end, cylinder
The N of shape permanent magnetic device (8) is extremely close to methane outlet conduit (6) one end.
2. a kind of separator of carbon dioxide/methane mixed gas as described in claim 1, which is characterized in that described
The length of tubular permanent magnetic device (8) is 0.7-1.5m, magnetic field strength 4.0-5.5T.
3. a kind of separator of carbon dioxide/methane mixed gas as described in claim 1, which is characterized in that described
The pressure that air pump (3) provides is 0.3-0.5MPa.
4. it is a kind of using carbon dioxide/methane mixed gas separator described in claim 1 to carbon dioxide/methane blended
The method of gas separation, which is characterized in that the separation method specifically follows the steps below:
Step 1: will equipped be configured to certain density carbon dioxide connect with the steel cylinder of methane mixed gas spinner flowmeter with
Then regulating valve is connect with mixed gas entry conductor (1)；
Step 2: being separately connected carbon dioxide and methane caching storage in carbon dioxide outlet conduit (5) and methane outlet conduit (6)
Then tank adjusts regulating valve, in conjunction with spinner flowmeter, mixed gas is allowed to enter in tee tube (4)；
Step 3: mixed gas under conditions of 25 DEG C of temperature, magnetic field strength 4.0-5.5T after tubular permanent magnetic device (8), two
Carbon oxide gas is collected after molecular screen membrane (7) enter carbon dioxide outlet conduit (5), and methane gas is then directly entered first
Alkane delivery channel is collected after (6).
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| CN201910452325.6A CN110237657A (en) | 2019-05-28 | 2019-05-28 | Separation device and method for carbon dioxide/methane mixed gas |
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| CN201910452325.6A CN110237657A (en) | 2019-05-28 | 2019-05-28 | Separation device and method for carbon dioxide/methane mixed gas |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109502873A (en) * | 2018-11-16 | 2019-03-22 | 西北矿冶研究院 | Device and method for treating heavy metal ions in wastewater |
| CN109502874A (en) * | 2018-11-16 | 2019-03-22 | 西北矿冶研究院 | Device and method for strengthening evaporation crystallization of arsenic trioxide |
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Application publication date: 20190917 |
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