CN208414349U - A kind of device purifying production liquefied natural gas using UF membrane - Google Patents
A kind of device purifying production liquefied natural gas using UF membrane Download PDFInfo
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- CN208414349U CN208414349U CN201820816601.3U CN201820816601U CN208414349U CN 208414349 U CN208414349 U CN 208414349U CN 201820816601 U CN201820816601 U CN 201820816601U CN 208414349 U CN208414349 U CN 208414349U
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Abstract
The utility model provides a kind of device that production liquefied natural gas is purified using UF membrane.The device of production liquefied natural gas is purified using UF membrane, it include: to be dehydrated de- hydrocarbon unit and the first UF membrane decarburization unit, the hydrocarbon unit that is dehydrated is configured to remove water and hydrocarbon in unstripped gas, and the first UF membrane decarburization unit is configured to remove the unstripped gas of water and hydrocarbon using the decarburization of UF membrane mode.The device that production liquefied natural gas is purified using UF membrane of the utility model, membrane separation plant is used in the process system of purification production liquefied natural gas for the first time, in a large amount of decarbonizing process, not only filter process is simple, membrane separation plant does not need to regenerate, it can simplify the matched regeneration air pipe of molecular sieve decarburization and relevant device etc., and UF membrane decarburization cost is lower.
Description
Technical field
The utility model relates to chemical fields, in particular to a kind of using UF membrane purification production liquefied natural gas
Device.
Background technique
Liquefied natural gas (Liquefied Natural Gas, abbreviation LNG), main component is methane, and being recognized is the earth
On the most clean energy.In general, liquefied natural gas is that purified natural gas is compressed, being cooled to its boiling point, (- 161.5 is Celsius
Degree) become liquid after temperature, usual LNG storage is in -161.5 degrees Celsius, the cryogenic storage tank of 0.1MPa or so.
But natural gas (unstripped gas) usually contains moisture, CO2The impurity of heavy hydrocarbon needs removing to be cleaned into after purified gas
It can be carried out liquefaction just to prepare liquefied natural gas.
Utility model content
One of the purpose of this utility model is to provide a kind of device for purifying production liquefied natural gas using UF membrane.
At least one of in order to solve the above-mentioned technical problem, the utility model provides following technical scheme:
A kind of device purifying production liquefied natural gas using UF membrane, comprising:
It is dehydrated de- hydrocarbon unit and the first UF membrane decarburization unit, the de- hydrocarbon unit of dehydration is configured to remove in unstripped gas
Water and hydrocarbon, the first UF membrane decarburization unit is configured to take off the unstripped gas for removing water and hydrocarbon using UF membrane mode
Carbon.
It further, further include absorption decarburization unit, the absorption decarburization list in the alternative embodiment of the utility model
Member is configured to will be by the further decarburization of unstripped gas after the first UF membrane decarburization unit decarburization.
The utility model has also mentioned a kind of device that production liquefied natural gas is purified using UF membrane, including is dehydrated de- hydrocarbon and takes off
Carbon unit and regeneration gas processing unit, the regeneration gas processing unit include regeneration air pipe, are dehydrated de- hydrocarbon unit and UF membrane
Decarburization unit, the regeneration air pipe are connect with the hydrocarbon decarburization unit that is dehydrated；
The hydrocarbon unit that is dehydrated is configured to remove from the water being dehydrated in the regeneration gas that de- hydrocarbon decarburization unit comes out
And hydrocarbon, the UF membrane decarburization unit are configured to remove the regeneration gas of water and hydrocarbon using the decarburization of UF membrane mode.
It further, further include absorption decarburization unit, the absorption decarburization list in the alternative embodiment of the utility model
Member is configured to will be by the further decarburization of regeneration gas after the UF membrane decarburization unit decarburization.
The utility model additionally provides a kind of device that production liquefied natural gas is purified using UF membrane, comprising:
UF membrane is dehydrated decarburization unit and adsorption dewatering decarburization takes off heavy hydrocarbon unit, and the UF membrane dehydration decarburization unit is matched
The water and CO being set in removing unstripped gas2, the adsorption dewatering decarburization take off heavy hydrocarbon unit be configured to that water and CO will be removed2Original
Material gas is dehydrated, decarburization and de- heavy hydrocarbon.
Further, in the alternative embodiment of the utility model, it includes that the adsorption dewatering decarburization, which takes off heavy hydrocarbon unit,
One adsorption plant, first adsorption plant are configured to that water and CO will be removed2Unstripped gas be dehydrated simultaneously, decarburization and de-
Heavy hydrocarbon.
Further, in the alternative embodiment of the utility model, the adsorption dewatering decarburization take off heavy hydrocarbon unit include according to
The second adsorption plant and third adsorption plant of secondary connection, second adsorption plant are configured to that water and CO will be removed2Original
Material gas carries out dehydration and de- heavy hydrocarbon, and the third adsorption plant is configured to remove water and the unstripped gas of heavy hydrocarbon carries out decarburization.
Further, in the alternative embodiment of the utility model, the adsorption dewatering decarburization take off heavy hydrocarbon unit include according to
The 4th adsorption plant, the 5th adsorption plant and the 6th adsorption plant of secondary connection, the 4th adsorption plant are configured to take off
Water removal and CO2Unstripped gas be dehydrated, the 5th adsorption plant be configured to will by the 4th adsorption plant be dehydrated
Unstripped gas carry out de- heavy hydrocarbon, the 6th adsorption plant is configured to the unstripped gas after de- heavy hydrocarbon carrying out decarburization.
It further, further include regeneration gas processing unit in the alternative embodiment of the utility model, at the regeneration gas
It is de- that the regeneration gas that reason unit is configured to take off the adsorption dewatering decarburization discharge of heavy hydrocarbon unit is transported to the UF membrane dehydration
The front end of carbon unit.
Further, in the alternative embodiment of the utility model, the regeneration gas processing unit includes regeneration air pipe
With the second UF membrane decarburization unit, the regeneration gas that the adsorption dewatering decarburization is taken off the discharge of heavy hydrocarbon unit by the regeneration air pipe is first
It is transported to the front end that the UF membrane is dehydrated decarburization unit again after being conveyed to the second UF membrane decarburization unit.
The beneficial effects of the utility model include: the dress that production liquefied natural gas is purified using UF membrane of the utility model
It sets, uses membrane separation plant, in a large amount of decarbonizing process, not only mistake in the process system of purification production liquefied natural gas for the first time
Filtration journey is simple, and membrane separation plant does not need to regenerate, and can simplify the matched regeneration air pipe of molecular sieve decarburization and relevant device
Deng, and UF membrane decarburization cost is lower.
Detailed description of the invention
It, below will be to required in embodiment in order to illustrate more clearly of the technical solution of the utility model embodiment
The attached drawing used is briefly described, it should be understood that the following drawings illustrates only some embodiments of the utility model, therefore not
It should be considered as the restriction to range, for those of ordinary skill in the art, without creative efforts,
It can also be obtained according to these attached drawings other relevant attached drawings.
Fig. 1 is that being purified using UF membrane for the first embodiment of the utility model offer produces liquefied natural gas plant
Schematic diagram；
Fig. 2 is the showing using UF membrane purification production liquefied natural gas plant that the first embodiment of the utility model provides
It is intended to；
Fig. 3 is that second of being purified using UF membrane for embodiment offer of the utility model produces liquefied natural gas plant
Schematic diagram；
Fig. 4 is the showing using UF membrane purification production liquefied natural gas plant that second of embodiment of the utility model provides
It is intended to；
Fig. 5 is that being purified using UF membrane for the third embodiment of the utility model offer produces liquefied natural gas plant
Schematic diagram；
Fig. 6 is the showing using UF membrane purification production liquefied natural gas plant that the third embodiment of the utility model provides
It is intended to；
Fig. 7 is that the 4th kind of being purified using UF membrane for embodiment offer of the utility model produces liquefied natural gas plant
Schematic diagram；
Fig. 8 is the showing using UF membrane purification production liquefied natural gas plant that the 4th kind of embodiment of the utility model provides
It is intended to；
Fig. 9 is that the 5th kind of being purified using UF membrane for embodiment offer of the utility model produces liquefied natural gas plant
Schematic diagram；
Figure 10 is that the 5th kind of being purified using UF membrane for embodiment offer of the utility model produces liquefied natural gas plant
Schematic diagram；
Figure 11 is the 6th kind of embodiment offer of the utility model using UF membrane purification production liquefied natural gas plant
Schematic diagram；
Figure 12 is that the 6th kind of being purified using UF membrane for embodiment offer of the utility model produces liquefied natural gas plant
Schematic diagram.
Icon: it is dehydrated de- hydrocarbon unit 100；First UF membrane decarburization unit 200；First membrane separation plant 210；Second film point
From equipment 220；Third membrane separation plant 230；Molecular sieve decarburization unit 300；Supercharger 400；Second UF membrane decarburization unit
500；UF membrane is dehydrated decarburization unit 600；Molecular sieve dehydration decarburization takes off heavy hydrocarbon unit 700.
Specific embodiment
It is practical below in conjunction with this to keep the purposes, technical schemes and advantages of the utility model embodiment clearer
The technical solution in the utility model embodiment is clearly and completely described in attached drawing in novel embodiment, shows
So, described embodiment is a part of embodiment of the utility model, rather than whole embodiments.It is practical based on this
Embodiment in novel, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment is fallen within the protection scope of the utility model.Therefore, the implementation to the utility model provided in the accompanying drawings below
The detailed description of mode is not intended to limit the range of claimed invention, but is merely representative of the utility model
Selected embodiment.Based on the embodiment in the utility model, those of ordinary skill in the art are not making creative labor
Every other embodiment obtained under the premise of dynamic, fall within the protection scope of the utility model.
In addition, term " first ", " second " etc. are used for description purposes only, it is not understood to indicate or imply relatively important
Property or implicitly indicate the quantity of indicated technical characteristic.The feature for defining " first ", " second " etc. as a result, can be expressed
Or implicitly include one or more of the features.In the description of the present invention, the meaning of " plurality " is two or
Two or more, unless otherwise specifically defined.
In the present invention unless specifically defined or limited otherwise, the terms such as term " connection " shall be understood in a broad sense,
For example, it may be being fixedly connected, it may be a detachable connection, or integral；It can be directly connected, centre can also be passed through
Medium is indirectly connected, and can be the connection inside two elements or the interaction relationship of two elements.For the general of this field
For logical technical staff, the concrete meaning of above-mentioned term in the present invention can be understood as the case may be.
The place of adsorption plant involved in the embodiment of the present application is specifically with molecular sieve equipment for example, for example molecular sieve is de-
Carbon unit, molecular sieve dehydration take off hydrocarbon unit etc..
As shown in Figure 1, a kind of embodiment of the utility model, which provides a kind of purify using UF membrane, produces liquefaction day
The device of right gas, including it is dehydrated de- hydrocarbon unit 100 and the first UF membrane decarburization unit 200.De- hydrocarbon unit 100 is dehydrated to be configured to
The water and hydrocarbon in unstripped gas are removed, the first UF membrane decarburization unit 200 is configured to remove the unstripped gas of water and hydrocarbon using film
Separate mode decarburization.First UF membrane decarburization unit 200 may include a membrane separation plant or multiple membrane separation plants.
Further, as shown in Fig. 2, in a kind of alternative embodiment of the utility model, the first UF membrane decarburization unit 200
Including the first membrane separation plant 210, the second membrane separation plant 220 and third membrane separation plant 230.Wherein, the first UF membrane is set
The component and structure of standby 210, second membrane separation plant 220 and third membrane separation plant 230 are referred to existing common film point
From equipment, the gas separation membrane of use is the film that CO2 can be isolated from natural gas.Membrane separation plant all has first outlet
And second outlet, after unstripped gas enters membrane separation plant, wherein (perfect condition is all to most CO2 in unstripped gas
CO2 it) is discharged through gas separation membrane and from second outlet, this portion gas can also be referred to as infiltration gas, its in unstripped gas
Residual air body (including a small amount of CO2) is trapped and is discharged from first outlet, this portion gas can also be referred to as retention gas.
The entrance of first membrane separation plant 210 is connect with the outlet for being dehydrated de- hydrocarbon unit 100, the first membrane separation plant 210
First outlet connect with the entrance of the second membrane separation plant 220, the second outlet of the first membrane separation plant 210 is connected to pressurization
Machine 400, supercharger 400 are connect with the entrance of third membrane separation plant 230 again, the pressure of the infiltration gas of the first membrane separation plant 210
Power is much smaller compared to retention gas (such as the pressure of infiltration gas is 0.05MPa), so infiltration gas is being sent to third UF membrane
It needs to be pressurized (such as being pressurized to 5.2MPa) using supercharger 400 before equipment 230.
(such as 5MPa) unstripped gas of high pressure initially enters the water and hydrocarbon being dehydrated in the de- removing of hydrocarbon unit 100 unstripped gas.It is de-
It may include the de- hydrocarbon equipment of dehydration that can remove water and hydrocarbon simultaneously that water, which takes off hydrocarbon unit 100, alternatively it is also possible to include dehydration equipment
With de- hydrocarbon equipment, dehydration equipment is connected to the front end of de- hydrocarbon equipment, is first dehydrated and takes off hydrocarbon again.
By being dehydrated and the unstripped gas of hydrocarbon (such as contains 3% CO2) enter the first membrane separation plant 210, in unstripped gas
Most of gas is trapped, and partial gas infiltration retains and only contains a small amount of CO in gas2(such as contain 0.5% CO2) and
Permeate mainly CO in gas2.The retention gas of first membrane separation plant 210 escapes and enter the second membrane separation plant from first outlet
220 further decarburizations.The retention gas of the first outlet discharge of second membrane separation plant 220 usually can achieve purified gas pair
The requirement of content (such as contains 80% CO2), it is of course also possible to judge whether to need to further increase film according to the actual situation
Separation equipment or other decarbonation appliances are with further decarburization.
Entering for the first membrane separation plant 210 is connected to after the second outlet connection supercharger 400 of second membrane separation plant 220
Mouthful；Gas componant that may be useful containing methane etc. in the infiltration gas of second membrane separation plant 220, so the second UF membrane is set
It is conveyed to the first membrane separation plant 210 after standby 220 infiltration gas pressurization, the utilization rate of unstripped gas can be improved, in addition, infiltration gas
Pressure compared to retention gas it is much smaller (such as infiltration gas pressure be 0.05MPa), so infiltration gas be sent to the first film
It needs to be pressurized (such as being pressurized to 5.1MPa) using supercharger 400 before separation equipment 210.Similarly, third membrane separation plant 230
The entrance of the first membrane separation plant 210 is connected to after first outlet connection supercharger 400.Third membrane separation plant 230 mainly into
One step recycles the gases such as the methane in the infiltration gas of the first membrane separation plant 210, so by the retention of third membrane separation plant 230
Gas is conveyed to the first membrane separation plant 210, and the utilization rate of unstripped gas can be improved.And for the infiltration of third membrane separation plant 230
It is ventilative then can be handled with process after direct emission.
Further, it as shown in figure 3, in the another embodiment of the utility model, is purified and is produced using UF membrane
The device of liquefied natural gas further includes molecular sieve decarburization unit 300, and molecular sieve decarburization unit 300 is configured to that the first film will be passed through
The further decarburization of unstripped gas after separating 200 decarburization of decarburization unit.
Further, as shown in figure 4, in a kind of alternative embodiment of the utility model, and with embodiment phase shown in Fig. 2
Than increasing molecular sieve decarburization unit 300 using the device that UF membrane purifies production liquefied natural gas, and eliminate the second film point
From equipment 220.The first outlet of first membrane separation plant 210 is directly connected to the entrance of molecular sieve decarburization unit 300.Tertiary membrane point
Connection relationship from equipment 230 is referring to the description to embodiment illustrated in fig. 2.
Further, molecular sieve decarburization unit 300 may include that multiple molecular sieve absorption for capableing of alternately decarburization are de-
Carbon equipment.In addition, molecular sieve decarburization unit 300 needs regeneration gas to regenerate it, and molecular sieve decarburization unit 300 is carried out
Regeneration gas after regeneration can be discharged into the front end for the supercharger 400 connecting with third membrane separation plant 230, can also be by increasing
The front end of the first membrane separation plant 210 is discharged into after pressure.
The utility model embodiment additionally provides a kind of method for purifying production liquefied natural gas using UF membrane, feature
It is, comprising:
Unstripped gas is subjected to dehydration and de- hydrocarbon, decarburization is then carried out to the unstripped gas after dehydration and de- hydrocarbon using membrane separation process
To prepare purified gas.
Further, in the alternative embodiment of the utility model, further includes: unstripped gas is first used UF membrane decarburization
Afterwards, then using absorption decarburization mode further to raw material gas decarbonization.
It liquefies naturally as shown in figure 5, the utility model optional embodiment has also mentioned a kind of produce using UF membrane purification
The device of gas, including it is dehydrated de- hydrocarbon decarburization unit and regeneration gas processing unit, regeneration gas processing unit includes regeneration air pipe, takes off
Water takes off hydrocarbon unit 100 and UF membrane decarburization unit, and regeneration air pipe is connect with de- hydrocarbon decarburization unit is dehydrated；It is dehydrated de- hydrocarbon unit
100 are configured to remove from the water and hydrocarbon being dehydrated in the regeneration gas that de- hydrocarbon decarburization unit comes out, and UF membrane decarburization unit 200 is matched
The regeneration gas by water and hydrocarbon is removed is set to using the decarburization of UF membrane mode.The regeneration gas purified through membrane separation decarburization unit 200
It returns and is dehydrated de- hydrocarbon decarburization unit.
It liquefies naturally as shown in fig. 6, the alternative embodiment of the utility model provides a kind of produce using UF membrane purification
The device of gas, including be dehydrated de- hydrocarbon decarburization unit, be dehydrated de- hydrocarbon unit 100 and the first UF membrane decarburization unit 200, and use
With the first UF membrane decarburization unit 200 identical in embodiment shown in Fig. 2.Difference essentially consists in, in Fig. 2, the first film point
It is arranged on the main road of raw material gas disposal from decarburization unit 200, and in Fig. 6, the first UF membrane decarburization unit 200 is arranged in raw material
Gas branch road processing regeneration gas.As shown in fig. 6, the entrance connection of the first membrane separation plant 210 is dehydrated going out for de- hydrocarbon unit 100
Mouthful, and the entrance connection for being dehydrated de- hydrocarbon unit 100 is dehydrated the regeneration gas outlet of de- hydrocarbon decarburization unit.In addition, the second UF membrane is set
Standby 220 first outlet is connected to the entrance for being dehydrated de- hydrocarbon decarburization unit, so that the retention gas of the second membrane separation plant 220 conveys
It is returned to de- hydrocarbon decarburization unit is dehydrated as regeneration gas, reduces unstripped gas waste.
Further, in the alternative embodiment of the utility model, as shown in fig. 7, further including molecular sieve decarburization unit
300, molecular sieve decarburization unit 300 is configured to will be through the further decarburization of regeneration gas after membrane separation decarburization unit decarburization.Through
The regeneration gas that over-molecular sieve decarburization unit 300 purifies, which returns, is dehydrated de- hydrocarbon decarburization unit.
Further, the utility model embodiment additionally provides a kind of side that production liquefied natural gas is purified using UF membrane
Method, comprising: first by the way of absorption, such as adsorbing tower with molecular sieve carries out unstripped gas to be dehydrated de- hydrocarbon decarburization, and using condensation
Mode carry out being dehydrated de- hydrocarbon to the regeneration gas formed in de- hydrocarbon decarbonizing process is dehydrated, then again by the way of UF membrane to again
Anger carries out carbonization treatment, is then handled by the way of molecular sieve decarburization regeneration gas again, then will pass through above-mentioned step
Suddenly the regeneration gas recycling of water, carbon and heavy hydrocarbon is stripped of to regenerate for adsorption tower.
Further, as shown in figure 8, in a kind of alternative embodiment of the utility model, the of the first membrane separation plant 210
One outlet is connected to the entrance of molecular sieve decarburization unit 300, and the gas after 300 decarburization of over-molecular sieve decarburization unit is transported to de-
Water takes off the front end of hydrocarbon decarburization unit.And the regeneration gas of molecular sieve decarburization unit 300 can be discharged to entering for the first membrane separation plant 210
Mouth discharges after being pressurized to third membrane separation plant 230.
The utility model embodiment also provides a kind of method for purifying production liquefied natural gas using UF membrane, comprising:
Unstripped gas is dehydrated by the way of absorption, takes off hydrocarbon and decarburization；
When regeneration gas regenerates, unstripped gas is dehydrated, takes off moisture, hydrocarbon and the CO generated when hydrocarbon and decarburization by regeneration gas2Band
Out, regeneration gas is dehydrated de- hydrocarbon, the regeneration gas after the de- hydrocarbon of dehydration is then removed into CO by UF membrane decarburization2After return to unstripped gas
Entrance.
It is produced as shown in figure 9, a kind of optional embodiment of the utility model additionally provides a kind of purify using UF membrane
The device of liquefied natural gas, comprising:
UF membrane is dehydrated decarburization unit 600 and molecular sieve dehydration decarburization takes off heavy hydrocarbon unit 700, and UF membrane is dehydrated decarburization unit
600 are configured to remove water and CO in unstripped gas2, molecular sieve dehydration decarburization take off heavy hydrocarbon unit 700 be configured to that water will be removed
And CO2Unstripped gas be dehydrated, decarburization and de- heavy hydrocarbon.
Further, as shown in Figure 10, in an embodiment of the present invention, production liquefaction day is purified using UF membrane
The device of right gas, including UF membrane dehydration decarburization unit 600 and molecular sieve dehydration decarburization take off heavy hydrocarbon unit 700.Wherein UF membrane
Being dehydrated decarburization unit 600 includes the first membrane separation plant 210, third membrane separation plant 230 and supercharger 400.First UF membrane
The entrance of equipment 210 connects unstripped gas (pressure 5MPa), the first outlet connection molecule sieve dehydration decarburization of the first membrane separation plant 210
De- heavy hydrocarbon unit 700, takes off the retention gas after 210 decarburization of the first membrane separation plant is conveyed to molecular sieve dehydration decarburization
The further decarburization of heavy hydrocarbon and remove water and heavy hydrocarbon.
The second outlet connection supercharger 400 of first membrane separation plant 210 is followed by entering to third membrane separation plant 230
Mouthful, to be conveyed to the further decarburization of third membrane separation plant 230 after being pressurized the infiltration gas of the first membrane separation plant 210.The
The first outlet of three membrane separation plants 230 is connected to the entrance of the first membrane separation plant 210.For the de- weight of molecular sieve dehydration decarburization
The regenerated regeneration gas of hydrocarbon unit 700 can be conveyed to the first membrane separation plant 210 after being pressurized or be conveyed to third UF membrane
Equipment 230.
Further, in the alternative embodiment of the utility model, it includes that molecular sieve dehydration decarburization, which takes off heavy hydrocarbon unit 700,
One molecular sieve equipment, the first molecular sieve equipment are configured to that water and CO will be removed2Unstripped gas be dehydrated simultaneously, decarburization and de-
Heavy hydrocarbon.
Further, in the alternative embodiment of the utility model, molecular sieve dehydration decarburization take off heavy hydrocarbon unit 700 include according to
The second molecular sieve equipment and third molecular sieve equipment of secondary connection, the second molecular sieve equipment are configured to that water and CO will be removed2's
Unstripped gas carries out dehydration and de- heavy hydrocarbon, and third molecular sieve equipment is configured to remove water and the unstripped gas of heavy hydrocarbon carries out decarburization.
Further, in the alternative embodiment of the utility model, molecular sieve dehydration decarburization take off heavy hydrocarbon unit 700 include according to
The 4th molecular sieve equipment, the 5th molecular sieve equipment and the 6th molecular sieve equipment of secondary connection, the 4th molecular sieve equipment are configured to
It will removing water and CO2Unstripped gas be dehydrated, the 5th molecular sieve equipment be configured to will by the 4th molecular sieve equipment be dehydrated
Unstripped gas carry out de- heavy hydrocarbon, the 6th molecular sieve equipment is configured to the unstripped gas after de- heavy hydrocarbon carrying out decarburization.
Further, further include regeneration gas processing unit in the alternative embodiment of the utility model, regenerate gas disposal list
Member is configured to take off molecular sieve dehydration decarburization the regeneration gas that heavy hydrocarbon unit 700 is discharged and is transported to UF membrane dehydration decarburization unit
600 front end.
Further, as shown in figure 11, in the alternative embodiment of the utility model, regeneration gas processing unit includes regeneration
Molecular sieve dehydration decarburization is taken off heavy hydrocarbon unit 700 and is discharged again by air pipe and the second UF membrane decarburization unit 500, regeneration air pipe
Anger is transported to the front end that UF membrane is dehydrated decarburization unit 600 after being first conveyed to the second UF membrane decarburization unit 500 again.
Further, as shown in figure 12, in the alternative embodiment of the utility model, the second UF membrane decarburization unit 500
Essentially identical with the first UF membrane decarburization 200 structures of unit, molecular sieve dehydration takes off heavy hydrocarbon decarburization unit and the second UF membrane decarburization
Booster pump is had additional between first membrane separation plant 210 of unit 500, molecular sieve dehydration is taken off heavy hydrocarbon decarburization unit again
It is conveyed to the first membrane separation plant 210 of the second UF membrane decarburization unit 500 after anger pressurization, and the second UF membrane decarburization unit
The first outlet of 500 the first membrane separation plant 210 is connected to the first membrane separation plant of the first UF membrane decarburization unit 600
210 entrance.
The utility model also provides a kind of method for purifying production liquefied natural gas using UF membrane, which is characterized in that packet
It includes:
By membrane separation process to water, CO2It is removed, then again by molecular sieve to water, CO2It further removes and takes off
Except heavy hydrocarbon；
Wherein, water, CO are removed using molecular sieve2When with heavy hydrocarbon, one of mode is included the following three types:
(1) molecular sieve dehydration is successively carried out, molecular sieve takes off heavy hydrocarbon and molecular sieve takes off CO2；
(2) molecular sieve dehydration and heavy hydrocarbon are first carried out, molecular sieve decarburization is then carried out；
(3) it carries out being dehydrated de- heavy hydrocarbon decarburization simultaneously.
It further, further include to adsorbing and removing water, CO in the alternative embodiment of the utility model2It is produced when with heavy hydrocarbon
The step of raw regeneration gas is handled, the step include that the regeneration gas is used as to unstripped gas after membrane separation carbonization treatment
It uses.
Membrane separation plant and membrane separation process are used in the process system of purification production liquefied natural gas for the first time, especially
UF membrane decarbonation appliance and method are used for the first time, and in a large amount of decarbonizing process, not only filter process is simple, and membrane separation plant is not required to
It regenerates, can simplify the matched regeneration air pipe of molecular sieve decarburization and relevant device etc., and UF membrane decarburization cost is lower.
Above description is merely a prefered embodiment of the utility model, is not intended to limit the utility model, for
For those skilled in the art, various modifications and changes may be made to the present invention.All spirit and original in the utility model
Within then, any modification, equivalent replacement, improvement and so on be should be included within the scope of protection of this utility model.
Claims (10)
1. a kind of device for purifying production liquefied natural gas using UF membrane characterized by comprising
It is dehydrated de- hydrocarbon unit and the first UF membrane decarburization unit, the de- hydrocarbon unit of dehydration is configured to remove the water in unstripped gas
And hydrocarbon, the first UF membrane decarburization unit are configured to remove the unstripped gas of water and hydrocarbon using the decarburization of UF membrane mode.
2. the device according to claim 1 for purifying production liquefied natural gas using UF membrane, which is characterized in that further include
Decarburization unit is adsorbed, the absorption decarburization unit is configured to will be by the raw material after the first UF membrane decarburization unit decarburization
The further decarburization of gas.
3. a kind of device for purifying production liquefied natural gas using UF membrane, which is characterized in that including being dehydrated de- hydrocarbon decarburization unit
With regeneration gas processing unit, the regeneration gas processing unit includes regeneration air pipe, is dehydrated de- hydrocarbon unit and UF membrane decarburization list
Member, the regeneration air pipe are connect with the hydrocarbon decarburization unit that is dehydrated；
The hydrocarbon unit that is dehydrated is configured to remove from the water and hydrocarbon being dehydrated in the regeneration gas that de- hydrocarbon decarburization unit comes out,
The UF membrane decarburization unit is configured to remove the regeneration gas of water and hydrocarbon using the decarburization of UF membrane mode.
4. the device according to claim 3 for purifying production liquefied natural gas using UF membrane, which is characterized in that further include
Adsorb decarburization unit, the absorption decarburization unit be configured to will by the regeneration gas after the UF membrane decarburization unit decarburization into
One step decarburization.
5. a kind of device for purifying production liquefied natural gas using UF membrane characterized by comprising
UF membrane is dehydrated decarburization unit and adsorption dewatering decarburization takes off heavy hydrocarbon unit；The UF membrane dehydration decarburization unit is configured to
Remove the water and CO in unstripped gas2, the adsorption dewatering decarburization take off heavy hydrocarbon unit be configured to that water and CO will be removed2Unstripped gas
It is dehydrated, decarburization and de- heavy hydrocarbon.
6. the device according to claim 5 for purifying production liquefied natural gas using UF membrane, which is characterized in that the suction
It includes the first adsorption plant that attached dehydration decarburization, which takes off heavy hydrocarbon unit, and first adsorption plant is configured to that water and CO will be removed2's
Unstripped gas is dehydrated simultaneously, decarburization and de- heavy hydrocarbon.
7. the device according to claim 5 for purifying production liquefied natural gas using UF membrane, which is characterized in that the suction
It includes sequentially connected second adsorption plant and third adsorption plant, second adsorption plant that attached dehydration decarburization, which takes off heavy hydrocarbon unit,
It is configured to that water and CO will be removed2Unstripped gas carry out dehydration and de- heavy hydrocarbon, the third adsorption plant be configured to remove
The unstripped gas of water and heavy hydrocarbon carries out decarburization.
8. the device according to claim 5 for purifying production liquefied natural gas using UF membrane, which is characterized in that the suction
It includes sequentially connected 4th adsorption plant, the 5th adsorption plant and the 6th adsorption plant, institute that attached dehydration decarburization, which takes off heavy hydrocarbon unit,
The 4th adsorption plant is stated to be configured to that water and CO will be removed2Unstripped gas be dehydrated, the 5th adsorption plant is configured to
De- heavy hydrocarbon will be carried out by the unstripped gas of the 4th adsorption plant dehydration, the 6th adsorption plant is configured to de- heavy hydrocarbon
Unstripped gas afterwards carries out decarburization.
9. the device according to claim 5 for purifying production liquefied natural gas using UF membrane, which is characterized in that further include
Regeneration gas processing unit, the regeneration gas processing unit are configured to the adsorption dewatering decarburization taking off the discharge of heavy hydrocarbon unit again
Anger is transported to the front end of the UF membrane dehydration decarburization unit.
10. the device according to claim 9 for purifying production liquefied natural gas using UF membrane, which is characterized in that described
Regeneration gas processing unit includes regeneration air pipe and the second UF membrane decarburization unit, and the regeneration air pipe is by the adsorption dewatering
The regeneration gas that decarburization takes off the discharge of heavy hydrocarbon unit is transported to the UF membrane dehydration after being first conveyed to the second UF membrane decarburization unit again
The front end of decarburization unit.
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| CN108424799A (en) * | 2018-05-29 | 2018-08-21 | 成都赛普瑞兴科技有限公司 | A kind of device and method purifying production liquefied natural gas using UF membrane |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108424799A (en) * | 2018-05-29 | 2018-08-21 | 成都赛普瑞兴科技有限公司 | A kind of device and method purifying production liquefied natural gas using UF membrane |
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