CN109988660A - Natural gas purification system and natural gas purification method - Google Patents
Natural gas purification system and natural gas purification method Download PDFInfo
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- CN109988660A CN109988660A CN201910379042.3A CN201910379042A CN109988660A CN 109988660 A CN109988660 A CN 109988660A CN 201910379042 A CN201910379042 A CN 201910379042A CN 109988660 A CN109988660 A CN 109988660A
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- hydrocarbon
- tsa
- gas
- regeneration
- regeneration gas
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- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 title claims abstract description 136
- 239000003345 natural gas Substances 0.000 title claims abstract description 69
- 238000000746 purification Methods 0.000 title claims abstract description 51
- 238000000034 method Methods 0.000 title claims abstract description 11
- 239000007789 gas Substances 0.000 claims abstract description 240
- 229930195733 hydrocarbon Natural products 0.000 claims abstract description 232
- 239000004215 Carbon black (E152) Substances 0.000 claims abstract description 231
- 230000008929 regeneration Effects 0.000 claims abstract description 183
- 238000011069 regeneration method Methods 0.000 claims abstract description 183
- 150000002430 hydrocarbons Chemical class 0.000 claims abstract description 150
- 230000001681 protective effect Effects 0.000 claims abstract description 72
- 239000003463 adsorbent Substances 0.000 claims abstract description 55
- 230000018044 dehydration Effects 0.000 claims abstract description 32
- 238000006297 dehydration reaction Methods 0.000 claims abstract description 32
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 31
- PVXVWWANJIWJOO-UHFFFAOYSA-N 1-(1,3-benzodioxol-5-yl)-N-ethylpropan-2-amine Chemical compound CCNC(C)CC1=CC=C2OCOC2=C1 PVXVWWANJIWJOO-UHFFFAOYSA-N 0.000 claims abstract description 28
- QMMZSJPSPRTHGB-UHFFFAOYSA-N MDEA Natural products CC(C)CCCCC=CCC=CC(O)=O QMMZSJPSPRTHGB-UHFFFAOYSA-N 0.000 claims abstract description 28
- 230000007420 reactivation Effects 0.000 claims abstract description 13
- 230000020335 dealkylation Effects 0.000 claims description 66
- 238000006900 dealkylation reaction Methods 0.000 claims description 66
- 238000001179 sorption measurement Methods 0.000 claims description 64
- 230000006835 compression Effects 0.000 claims description 10
- 238000007906 compression Methods 0.000 claims description 10
- 239000007788 liquid Substances 0.000 claims description 8
- 238000000926 separation method Methods 0.000 claims description 7
- 239000000126 substance Substances 0.000 abstract description 4
- 238000010586 diagram Methods 0.000 description 12
- 238000010438 heat treatment Methods 0.000 description 10
- 238000001816 cooling Methods 0.000 description 7
- 238000003795 desorption Methods 0.000 description 6
- 230000001105 regulatory effect Effects 0.000 description 6
- 230000000903 blocking effect Effects 0.000 description 5
- 238000007710 freezing Methods 0.000 description 5
- 230000008014 freezing Effects 0.000 description 5
- 238000007664 blowing Methods 0.000 description 4
- 238000010521 absorption reaction Methods 0.000 description 3
- 230000008676 import Effects 0.000 description 3
- 239000003949 liquefied natural gas Substances 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000002808 molecular sieve Substances 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 239000000741 silica gel Substances 0.000 description 1
- 229910002027 silica gel Inorganic materials 0.000 description 1
- URGAHOPLAPQHLN-UHFFFAOYSA-N sodium aluminosilicate Chemical compound [Na+].[Al+3].[O-][Si]([O-])=O.[O-][Si]([O-])=O URGAHOPLAPQHLN-UHFFFAOYSA-N 0.000 description 1
- -1 that is Substances 0.000 description 1
Classifications
-
- 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
-
- 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
-
- 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
- C10L3/106—Removal of contaminants of water
Abstract
This application involves chemical fields, in particular to a kind of natural gas purification system and natural gas purification method.Natural gas purification system includes MDEA deacidifying device, TSA is dehydrated de- hydrocarbon device and TSA takes off hydrocarbon protective device；TSA is dehydrated de- hydrocarbon device and is connected between MDEA deacidifying device and the de- hydrocarbon protective device of TSA, and TSA, which takes off hydrocarbon protective device, can be dehydrated again the gas of the de- hydrocarbon device output of TSA dehydration, take off heavy hydrocarbon；TSA, which takes off hydrocarbon protective device or the portioned product gas of the de- hydrocarbon device output of TSA dehydration, can take off hydrocarbon protective device progress adsorbent reactivation by input TSA again as regeneration gas.Regeneration gas can take off hydrocarbon protective device by input TSA again and carry out adsorbent reactivation, heavy hydrocarbon and water can be caused to enter ice chest and cause frozen block to avoid because adsorbent reaches saturation.
Description
Technical field
This application involves chemical fields, in particular to a kind of natural gas purification system and natural gas purification method.
Background technique
Liquefied natural gas (LNG) is that purified natural gas is compressed, is cooled to its boiling point (- 161.5 degrees Celsius) temperature
After become liquid, usual LNG storage is in -161.5 degrees Celsius, the cryogenic storage tank of 0.1MPa or so.
Natural gas contains heavy hydrocarbon and water, using a conventional step absorption method natural gas purification process, over time,
Adsorbent power decline, de- heavy hydrocarbon is unqualified, ultimately causes Cold box blocking and freezing.
Summary of the invention
The embodiment of the present application is designed to provide a kind of natural gas purification system and natural gas purification method, is intended to change
The problem of being apt to the ice chest easy frozen block of existing natural gas purification.
The application first aspect provides a kind of natural gas purification system, natural gas purification system include MDEA deacidifying device,
TSA is dehydrated de- hydrocarbon device and TSA takes off hydrocarbon protective device；The TSA is dehydrated de- hydrocarbon device and is connected to the MDEA deacidifying device
It is taken off between hydrocarbon protective device with the TSA, the TSA takes off the gas that hydrocarbon protective device can be dehydrated de- hydrocarbon device output to the TSA
Body is dehydrated again, takes off heavy hydrocarbon；TSA takes off hydrocarbon protective device or the TSA is dehydrated the portioned product gas conduct of de- hydrocarbon device output
Regeneration gas can be inputted the TSA again and take off hydrocarbon protective device progress adsorbent reactivation.
TSA takes off hydrocarbon protective device and is dehydrated again to the TSA gas for being dehydrated de- hydrocarbon device output, takes off heavy hydrocarbon；TSA takes off hydrocarbon
The portioned product gas of protective device output can be inputted the TSA as regeneration gas again and take off hydrocarbon protective device progress adsorbent again
It is raw；The removing of heavy hydrocarbon and water can be avoided in the case where entire natural gas purification systems stay is run to adsorbent reactivation
Not exclusively, heavy hydrocarbon and water can be caused to enter ice chest and cause frozen block to avoid because adsorbent reaches saturation.
In some embodiments of the application first aspect, TSA described above takes off hydrocarbon protective device and includes:
At least two dealkylation towers, the gas that the dealkylation tower is used to be dehydrated the TSA de- hydrocarbon device output is dehydrated again,
De- heavy hydrocarbon；
Regeneration gas air inlet pipe, the regeneration gas air inlet pipe are connect with the dealkylation tower, for conveying again for the dealkylation tower
It is angry；And
Regeneration gas escape pipe, the regeneration gas escape pipe are used to export the gas after carrying out adsorbent reactivation.
TSA takes off hydrocarbon protective device and is dehydrated again, takes off heavy hydrocarbon, and regeneration gas air inlet pipe conveys regeneration gas, and regeneration gas is to dealkylation tower
Interior adsorbent reactivation avoids heavy hydrocarbon and water from entering liquefaction there is no dehydration, the effect of de- heavy hydrocarbon after avoiding adsorbent from being saturated
System.
In some embodiments of the application first aspect, the outlet side of above-mentioned regeneration gas escape pipe and the MDEA depickling
The air inlet of device or the TSA are dehydrated the air inlet connection of de- hydrocarbon device；
Preferably, it further includes sequentially connected first regeneration Gas Cooler and the first regeneration that the TSA, which takes off hydrocarbon protective device,
Gas separating device, the outlet side of the regeneration gas escape pipe are connect with the first regeneration Gas Cooler；First regeneration gas point
It is used to carry out gas-liquid separation to the gas after the regeneration from device.
The gas of the outlet side output of regeneration gas escape pipe can be delivered to natural gas deacidifying device or TSA is dehydrated de- hydrocarbon
Device utilizes regeneration gas again, reduces the cost, environmental protection.First regeneration Gas Cooler make regeneration after the intracorporal heavy hydrocarbon of gas and
Aqueous；First regeneration gas separating device is mainly for separating of the gas and liquid in regeneration gas escape pipe, by liquid and gas point
It leaves, then delivers the gas to natural gas deacidifying device or the de- hydrocarbon device of TSA dehydration；Avoid heavy hydrocarbon in regeneration gas and water again
It is secondary to enter natural gas purification system, avoid unnecessary energy consumption.
In some embodiments of the application first aspect, above-mentioned natural qi exhaustion hydrocarbon protective device further includes the first regeneration gas
Heater, the first regeneration hot-air heater are installed between the inlet end of regeneration gas air inlet pipe and the outlet side of regeneration gas air inlet pipe.
First regeneration hot-air heater is installed on regeneration gas air inlet pipe, for the gas heating for flowing through regeneration gas air inlet pipe, increases
Regeneration gas promotes the desorption of the heavy hydrocarbon and water in adsorbent to the palingenesis of adsorbent.
In some embodiments of the application first aspect, above-mentioned natural gas purification system further includes regeneration gas compression dress
It sets, the gas pressurized that the regeneration gas compression set is used for as regeneration gas escape pipe output.
Regeneration gas compression set can be the gas pressurized that de- hydrocarbon device is dehydrated into MDEA deacidifying device, TSA, after pressurization
Gas can smoothly enter into MDEA deacidifying device, TSA is dehydrated de- hydrocarbon device.
In some embodiments of the application first aspect, above-mentioned TSA is dehydrated de- hydrocarbon device and includes:
At least two adsorption towers, gas dewatering that the adsorption tower is used to export the MDEA deacidifying device take off heavy hydrocarbon；
Regeneration gas feed pipe, the regeneration gas feed pipe are connect with the adsorption tower, for conveying again for the adsorption tower
It is angry；And
Regeneration gas discharge nozzle, the regeneration gas discharge nozzle are used to export the gas after the regeneration in the adsorption tower.
The adsorption tower that regeneration gas feed pipe can be dehydrated de- hydrocarbon device to TSA conveys regeneration gas, regenerate so to adsorbent
It is exported afterwards by regeneration gas discharge nozzle.Heavy hydrocarbon and water can be caused to enter liquefaction system to avoid because adsorbent reaches saturation
System.
In some embodiments of the application first aspect, the outlet of above-mentioned regeneration gas discharge nozzle and TSA are dehydrated de- hydrocarbon dress
The air inlet connection set.
The gas of regeneration gas discharge nozzle outlet inputs gas dehydration again and takes off hydrocarbon device, is recycled, avoids wasting.
In some embodiments of the application first aspect, it further includes sequentially connected that above-mentioned TSA, which is dehydrated de- hydrocarbon device,
Two regeneration Gas Coolers and the second regeneration gas separating device, the outlet of the regeneration gas discharge nozzle and the second regeneration Gas Cooler
Connection, the second regeneration gas separating device are used to carry out gas-liquid separation to the gas after the regeneration.Optionally, the TSA is de-
It further includes the second regeneration hot-air heater that water, which takes off hydrocarbon device, and the second regeneration hot-air heater is for heating the regeneration gas
Second regeneration Gas Cooler keeps heavy hydrocarbon, water cooled, then again by the second regeneration gas separating device by heavy hydrocarbon, water with
Gas separation, gas obtained after separation input gas dehydration again and take off hydrocarbon device.
The application second aspect provides a kind of natural gas purification method, comprising:
Unstripped gas after depickling, the de- hydrocarbon of dehydration is passed through the de- hydrocarbon protective device of TSA and is dehydrated heavy hydrocarbon again, the TSA is de-
Hydrocarbon protective device includes that at least two dealkylation towers take off hydrocarbon again；
The TSA is taken off into hydrocarbon protective device or the TSA is dehydrated the portion gas that de- hydrocarbon device exports and is passed through the TSA
Part dealkylation tower in de- hydrocarbon protective device regenerates adsorbent.
TSA takes off hydrocarbon protective device and is dehydrated heavy hydrocarbon again, and removing can be made more thorough, and it is defeated that the TSA takes off hydrocarbon protective device
Portion gas out is passed through the part dealkylation tower that the TSA takes off in hydrocarbon protective device and regenerates to adsorbent；Can to avoid because
For adsorbent reaches saturation and causes heavy hydrocarbon and water to enter ice chest and causes frozen block.
In some embodiments of the application second aspect, it is above-mentioned adsorbent is regenerated after obtained gas it is defeated again
It send to the air inlet of MDEA deacidifying device or TSA and is dehydrated the air inlet of de- hydrocarbon device.
The gas of regeneration gas discharge nozzle outlet inputs natural gas deacidifying device again or TSA is dehydrated de- hydrocarbon device, circulation
It uses, avoids wasting.
Detailed description of the invention
Technical solution in ord to more clearly illustrate embodiments of the present application, below will be to needed in the embodiment attached
Figure is briefly described, it should be understood that the following drawings illustrates only some embodiments of the application, therefore is not construed as pair
The restriction of range for those of ordinary skill in the art without creative efforts, can also be according to this
A little attached drawings obtain other relevant attached drawings.
Fig. 1 shows the structure diagram of natural gas purification system first embodiment provided by the embodiments of the present application；
Fig. 2 shows the structural schematic diagrams of natural gas purification system first embodiment provided by the embodiments of the present application；
Fig. 3 shows the structural schematic diagram of natural qi exhaustion hydrocarbon protective device provided by the embodiments of the present application；
Fig. 4 shows the structural schematic diagram that TSA provided by the embodiments of the present application is dehydrated de- hydrocarbon device；
Fig. 5 shows the flow diagram of natural gas purification system first embodiment provided by the embodiments of the present application；
Fig. 6 shows the flow diagram of natural gas purification system second embodiment provided by the embodiments of the present application.
Icon: 100- natural gas purification system；101-MDEA deacidifying device；102- natural gas liquefaction device；103- regeneration
Air pressure compression apparatus；110-TSA is dehydrated de- hydrocarbon device；200-TSA takes off hydrocarbon protective device；The first valve of 201-；The second valve of 202-；203-
Third valve；The 4th valve of 204-；The 5th valve of 205-；The 6th valve of 206-；The first dealkylation tower of 210-；The first air inlet pipe of 211-；212-
One escape pipe；The first air outlet valve of 213-；The second dealkylation tower of 220-；The second air inlet pipe of 221-；The second escape pipe of 222-；223- second
Air outlet valve；230- regeneration gas air inlet pipe；240- regeneration gas escape pipe；250- first regenerates gas separating device；The first regeneration gas of 251-
Condenser；260- first regenerates hot-air heater；301- regulating valve；302- branch pipe；The first adsorption tower of 310-；320- second is adsorbed
Tower；330- third adsorption tower；340- regeneration gas discharge nozzle；350- second regenerates gas separating device；351- second regenerates gas condenser；
360- second regenerates hot-air heater.
Specific embodiment
To keep the purposes, technical schemes and advantages of the embodiment of the present application clearer, below in conjunction with the embodiment of the present application
In attached drawing, the technical scheme in the embodiment of the application is clearly and completely described, it is clear that described embodiment is
Some embodiments of the present application, instead of all the embodiments.The application being usually described and illustrated herein in the accompanying drawings is implemented
The component of example can be arranged and be designed with a variety of different configurations.
Therefore, the detailed description of the embodiments herein provided in the accompanying drawings is not intended to limit below claimed
Scope of the present application, but be merely representative of the selected embodiment of the application.Based on the embodiment in the application, this field is common
Technical staff's every other embodiment obtained without creative efforts belongs to the model of the application protection
It encloses.
It should also be noted that similar label and letter indicate similar terms in following attached drawing, therefore, once a certain Xiang Yi
It is defined in a attached drawing, does not then need that it is further defined and explained in subsequent attached drawing.
In addition, term " first ", " second " etc. are only used for distinguishing description, it is not understood to indicate or imply relatively important
Property.
In the description of the embodiment of the present application, it is also necessary to which explanation is unless specifically defined or limited otherwise, term
" setting ", " installation ", " connection " shall be understood in a broad sense, for example, it may be fixedly connected, may be a detachable connection or one
Connect to body；It can be directly connected, the connection inside two elements can also be can be indirectly connected through an intermediary.
For the ordinary skill in the art, the concrete meaning of above-mentioned term in this application can be understood with concrete condition.
Embodiment
Fig. 1 shows the structure diagram of 100 first embodiment of natural gas purification system provided by the embodiments of the present application；Figure
2 show the structural schematic diagram of 100 first embodiment of natural gas purification system provided by the embodiments of the present application, please refer to Fig. 1
With Fig. 2, the embodiment of the present application provides a kind of natural gas purification system 100, is mainly used for purified natural gas.
Natural gas purification system 100 includes that TSA is dehydrated de- hydrocarbon device 110, TSA takes off hydrocarbon protective device 200 and MDEA is de-
Sour device 101.The outlet that TSA is dehydrated de- hydrocarbon device 110 is connect with the TSA import for taking off hydrocarbon protective device 200；TSA is dehydrated de- hydrocarbon
The entrance of device 110 is connect with the outlet of MDEA deacidifying device 101；The outlet that TSA takes off hydrocarbon protective device 200 can be with natural gas
Liquefying plant 102 connects.
TSA is dehydrated de- hydrocarbon device 110 and is mainly used for dehydration, de- heavy hydrocarbon, and TSA takes off hydrocarbon protective device 200 and is mainly used for again
By the gas dewatering after dehydration, de- heavy hydrocarbon and de- heavy hydrocarbon, the filler saturation Hou Shui for avoiding TSA from being dehydrated in de- hydrocarbon device 110 with again
Hydrocarbon, which enters natural gas liquefaction device 102, leads to Cold box blocking and freezing.
TSA provided by the embodiments of the present application introduced below takes off the structure of hydrocarbon protective device 200.
Fig. 3 shows the structural schematic diagram that TSA provided by the embodiments of the present application takes off hydrocarbon protective device 200, please refers to Fig. 3.
In an embodiment of the present invention, TSA take off hydrocarbon protective device 200 include two dealkylation towers, i.e. the first dealkylation tower 210,
Second dealkylation tower 220；First dealkylation tower 210 is configured with the first air inlet pipe 211 and the first escape pipe 212, and the first air inlet pipe 211 is set
It is equipped with the first valve 201, the first escape pipe 212 is provided with the first air outlet valve 213.
Second dealkylation tower 220 is configured with the second air inlet pipe 221 and the second escape pipe 222, and the second air inlet pipe 221 is provided with the
Two valves 202；Second escape pipe 222 is provided with the second air outlet valve 223.
First air inlet pipe 211 is dehydrated de- hydrocarbon device 110 with TSA by the first valve 201 and connect, and the first escape pipe 212 is used for
Export the gas in the first dealkylation tower 210.Second air inlet pipe 221 is dehydrated de- hydrocarbon device 110 with TSA by the second valve 202 and connect,
Second escape pipe 222 is used to export the gas in the second dealkylation tower 220.First dealkylation tower 210, the second dealkylation tower 220 are mainly used
It is further dehydrated and de- heavy hydrocarbon in that will be dehydrated de- hydrocarbon device 110 by TSA again and take off heavy hydrocarbon and dewatered gas.
Regeneration gas air inlet pipe 230 passes through the 5th valve 205, the 6th valve 206 and the first dealkylation tower 210, the second dealkylation tower respectively
220 connections.It controls whether to need to the by the first air outlet valve 213, the 5th valve 205 of the second air outlet valve 223 and the 6th valve 206
Regeneration gas is conveyed in one dealkylation tower 210 or the second dealkylation tower 220.
First dealkylation tower 210, the second dealkylation tower 220 pass through third valve 203, the 4th valve 204 and regeneration gas escape pipe respectively
240 connections.The first dealkylation tower 210 or the are controlled by the first valve 201, the second valve 202, third valve 203 and the 4th valve 204
Gas in two dealkylation towers 220 is exported from regeneration gas escape pipe 240.Regeneration gas, that is, TSA takes off hydrocarbon protective device 200 and carries out de- weight
Hydrocarbon, dewatered portioned product gas, in other words, one in two dealkylation towers carries out de- heavy hydrocarbon, dehydration, then by de- heavy hydrocarbon,
Dewatered portioned product gas, which is delivered in another dealkylation tower as regeneration gas by air outlet valve, regenerates adsorbent, and one
After the section time, the flow direction exchange of gas in two dealkylation towers.
TSA takes off hydrocarbon protective device 200 during carrying out de- heavy hydrocarbon, dehydration, while carrying out adsorbent and being regenerated, and one
Heavy hydrocarbon, dehydration are taken off using the dealkylation tower where the adsorbent after regeneration after the section time；Ensure that heavy hydrocarbon in gas, water contain
It measures low, avoids Cold box blocking and freezing.
In the present embodiment, it includes two dealkylation towers that TSA, which takes off hydrocarbon protective device 200,.In the other embodiments of the application,
It may include multiple dealkylation towers such as three, four, six that TSA, which takes off hydrocarbon protective device 200, and each dealkylation tower is each equipped with air inlet
Pipe and escape pipe；The escape pipe of each dealkylation tower is provided with air outlet valve；Each air outlet valve with regeneration gas air inlet pipe 230 into
The connection of gas end, each escape pipe pass through valve and connect with the outlet side of regeneration gas air inlet pipe 230.
Correspondingly, TSA takes off in the embodiment that hydrocarbon protective device 200 includes multiple dealkylation towers, in multiple dealkylation towers extremely
Few one carries out de- heavy hydrocarbon, dehydration, after be delivered to using de- heavy hydrocarbon, dewatered portioned product gas as regeneration gas by air outlet valve
Adsorbent is regenerated in remaining dealkylation tower, after a period of time, replacement is so recycled, and can avoid because adsorbent reaches full
With and the ice chest that causes heavy hydrocarbon and water to enter liquefaction system causes frozen block.
It should be noted that when TSA takes off the operation of hydrocarbon protective device 200, regeneration gas air inlet pipe 230 and regeneration gas escape pipe
240 can be spaced and be passed through regeneration gas, be not to need always to dealkylation tower when TSA takes off hydrocarbon protective device 200 and runs in other words
Interior adsorbent is regenerated, for example, adsorbent is unsaturated, can not regenerate to it when just starting to drive.
In some embodiments of the present application, it further includes the first regeneration hot-air heater 260 that TSA, which takes off hydrocarbon protective device 200,.The
One regeneration gas heater 260 is installed on regeneration gas air inlet pipe 230, heated to flow through the gas of regeneration gas air inlet pipe 230 (such as plus
Heat is to 240 DEG C or more), increase regeneration gas to the palingenesis of adsorbent, promotes the desorption of the heavy hydrocarbon and water in adsorbent.
From the above, when regeneration gas air inlet pipe 230 conveys regeneration gas to the first dealkylation tower 210, the 5th valve 205 is opened,
Gas after making the progress adsorbent reactivation in the first dealkylation tower 210 is exported from regeneration gas escape pipe 240；Correspondingly, work as regeneration
When gas air inlet pipe 230 conveys regeneration gas to the second dealkylation tower 220, the 6th valve 206 is opened, and makes to be inhaled in the second dealkylation tower 220
Gas after attached dose of regeneration is exported from regeneration gas escape pipe 240.
In some embodiments of the present application, outlet side and the MDEA deacidifying device 101 of above-mentioned regeneration gas escape pipe 240
Air inlet or TSA are dehydrated the air inlet connection of de- hydrocarbon device 110.
In other words, regeneration gas escape pipe 240 outlet side output gas can be delivered to MDEA deacidifying device 101 or
TSA is dehydrated de- hydrocarbon device 110, utilizes again to regeneration gas, reduces cost, environmental protection.
It is understood that the outlet side of regeneration gas escape pipe 240 can also be with it in the other embodiments of the application
The connection of his device, such as with the air inlet of boiler etc., other purposes can be done.
Further, it further includes sequentially connected first regeneration gas condenser 251 and first that TSA, which takes off hydrocarbon protective device 200,
Gas separating device 250 is regenerated, the outlet side of regeneration gas escape pipe 240 is connect with the first regeneration gas condenser 251；First regeneration gas point
It is connect from device 250 with the air inlet that the air inlet of MDEA deacidifying device 101 or TSA are dehydrated de- hydrocarbon device 110.
TSA introduced below takes off a kind of operating status of hydrocarbon protective device 200 when in use.
First valve 201, the first air outlet valve 213, the 6th valve 206 and the 4th valve 204 are opened；Second valve 202, third valve
203, the 5th valve 205 and the second air outlet valve 223 are closed.
First 210 pairs of dealkylation tower takes off heavy hydrocarbon by the gas that TSA is dehydrated de- hydrocarbon device 110, dewatered gas takes off again
Heavy hydrocarbon, dehydration；From the first escape pipe 212 export gas some as regeneration gas by first regenerate hot-air heater 260
Then heating enters the second dealkylation tower 220 by the 6th valve 206, regenerates to the adsorbent in tower, then pass through the 4th valve
204 outflows, it is cooling (such as regeneration gas is crossed and is cooled to 0~20 DEG C) by the first regeneration gas condenser 251, make heavy hydrocarbon and water cooling
It is solidifying, it is then separated by the first regeneration gas separating device 250, then deliver the gas to MDEA deacidifying device 101 or TSA dehydration is de-
Hydrocarbon device 110.
After a period of time, the first valve 201, the first air outlet valve 213, the 6th valve 206 and the 4th valve 204 are closed；Second valve
202, third valve 203, the 5th valve 205 and the second air outlet valve 223 are opened.Regeneration gas enters the first dealkylation tower 210, in tower
Adsorbent is regenerated, and during this period of time, the second dealkylation tower 220 carries out de- heavy hydrocarbon, dehydration.So circulation.
In some embodiments of the present application, natural gas purification system 100 further includes regeneration gas compression set 103, regeneration
Air pressure compression apparatus 103 is connect with the outlet of regeneration gas escape pipe 240.
The gas that regeneration gas escape pipe 240 exports enters regeneration gas compression set 103, is conducive to by compressed gas defeated
It send, it is easier to enter MDEA deacidifying device 101 or TSA is dehydrated de- hydrocarbon device 110.
In embodiments herein, adsorbent in the first dealkylation tower 210, the second dealkylation tower 220 can for active carbon,
Molecular sieve, silica gel etc..First dealkylation tower 210, the second dealkylation tower 220 are packed tower, the first dealkylation tower 210, the second dealkylation tower 220
Internal structure referring to, to the desorption column of heavy hydrocarbon and water, the present embodiment will not be described in great detail in natural gas purification.
TSA provided by the embodiments of the present application introduced below is dehydrated the structure of de- hydrocarbon device 110.
Fig. 4 shows the structural schematic diagram that TSA provided by the embodiments of the present application is dehydrated de- hydrocarbon device 110, and Fig. 5 shows this
Apply for the flow diagram for 100 first embodiment of natural gas purification system that embodiment provides；Fig. 3 is please referred to Fig. 5.
From the above, TSA is dehydrated de- hydrocarbon device 110 and is mainly used for as natural qi exhaustion heavy hydrocarbon, dehydration, the de- hydrocarbon dress of TSA dehydration
Set 110 de- heavy hydrocarbons, dewatered gas is delivered to TSA and takes off hydrocarbon protective device 200.
In the present embodiment, it includes three adsorption towers that TSA, which is dehydrated de- hydrocarbon device 110, i.e. the first adsorption tower 310, second is inhaled
Attached tower 320 and third adsorption tower 330.
First adsorption tower 310, the second adsorption tower 320 and third adsorption tower 330 pass through pipeline and MDEA deacidifying device
101 discharge pipe connection.
First adsorption tower 310, the second adsorption tower 320 and third adsorption tower 330 pass through valve and regeneration gas discharge nozzle
340 connections, allow the regeneration gas of the first adsorption tower 310, the second adsorption tower 320 and third adsorption tower 330 to pass through regeneration gas
Discharge nozzle 340 exports.
In embodiments herein, it further includes sequentially connected second regeneration gas condenser that TSA, which is dehydrated de- hydrocarbon device 110,
351, the second regeneration gas separating device 350, regeneration gas discharge nozzle 340 are connect with the second regeneration gas condenser 351, the second regeneration air cooling
Condenser 351 is connect with the second regeneration gas separating device 350, and the second regeneration gas condenser 351 is containing for the output of regeneration gas discharge nozzle 340
There is the cooling of the gas of heavy hydrocarbon and water, make heavy hydrocarbon and aqueous, the second regeneration gas separating device 350 is used for regeneration gas discharge nozzle
The gas containing heavy hydrocarbon and water of 340 outputs is separated, and the outlet of the second regeneration gas separating device 350 and TSA are dehydrated de- hydrocarbon
The air inlet of device 110 connects.In the present embodiment, it includes two second regeneration gas condensers that TSA, which is dehydrated de- hydrocarbon device 110,
351, regeneration gas discharge nozzle 340 is exported cooling containing the gas two-stage of heavy hydrocarbon and water.
Heavy hydrocarbon and water are separated using the second regeneration gas separating device 350, it can to avoid the water being desorbed from adsorbent and again
Hydrocarbon is again introduced into natural gas purification system 100, increases the load of the desorption of adsorbent, save the cost.
In the present embodiment, it further includes regulating valve 301 that TSA, which is dehydrated de- hydrocarbon device 110,；Regeneration gas discharge nozzle 340 and adjusting
The outlet of valve 301 connects.Connected by branch pipe 302 and the first adsorption tower 310, the second adsorption tower 320 and third adsorption tower 330
It connects, the import of branch pipe 302 is set to the import front end of regulating valve 301.
Correspondingly, the outlet of the first adsorption tower 310, the second adsorption tower 320 and third adsorption tower 330 pass through valve with
TSA takes off hydrocarbon protective device 200 and connects.
In the present embodiment, it further includes the second regeneration hot-air heater 360 that TSA, which is dehydrated de- hydrocarbon device 110, and the second regeneration gas adds
Hot device 360 is used for heating regeneration gas；Regeneration gas after being heated is loaded into the first adsorption tower 310, the second adsorption tower 320 or
Three adsorption towers 330.
TSA introduced below is dehydrated a kind of de- operating status of hydrocarbon device 110 when in use.MDEA deacidifying device 101 goes out
The gas of pipe material output enters the de- hydrocarbon device 110 of TSA dehydration and takes off heavy hydrocarbon, dehydration.
Regulating valve 301 is opened, and the gas of the discharge pipe output of MDEA deacidifying device 101 only enters the first adsorption tower 310,
First adsorption tower 310 is adsorbed；It is delivered to TSA after absorption and takes off hydrocarbon protective device 200.
The valve connecting on branch pipe 302 with the second adsorption tower 320 is opened, the adsorbent in the second adsorption tower 320 is carried out
Desorption is " cold blowing ", and the gas of the second adsorption tower 320 output passes through the heating of the second regeneration hot-air heater 360 again；The gas of heating
Enter third adsorption tower 330 (from the lower end entrance of third adsorption tower 330 in Fig. 4) later, to the absorption in third adsorption tower 330
Agent carries out desorption and regeneration；The regeneration of the second regeneration gas condenser 351, second is delivered to by regeneration gas discharge nozzle 340 after regeneration
Gas separating device 350, the second regeneration gas separating device 350 separate heavy hydrocarbon and water；It is delivered to the outlet of regulating valve 301 again.
In other words, the first adsorption tower 310 adsorbs gas, and the second adsorption tower 320 carries out " cold blowing ", third adsorption tower
330 carry out adsorbent reactivation.
After a period of time, need to cool down to third adsorption tower 330, by adjusting and the first adsorption tower 310, the second adsorption tower
320 and the valve that connects of third adsorption tower 330, so that third adsorption tower 330 is carried out " cold blowing ", the first adsorption tower 310 inhaled
Attached dose of regeneration, the second adsorption tower 320 carry out adsorption dewatering and take off heavy hydrocarbon.So circulation can not take off after avoiding adsorbent from reaching saturation
Heavy hydrocarbon, dehydration, avoid Cold box blocking and freezing.
In the other embodiments of the application, it also may include two, four, six etc. more that TSA, which is dehydrated de- hydrocarbon device 110,
A adsorption tower.From the above, during being dehydrated de- hydrocarbon device 110 using TSA, at least one of multiple adsorption towers is taken off
Heavy hydrocarbon, dehydration.
After a period of time, replacement carries out the adsorption tower of de- heavy hydrocarbon, the adsorption tower of dehydration and progress adsorbent reactivation, so
Circulation can cause heavy hydrocarbon and water to enter ice chest and cause frozen block to avoid because adsorbent reaches saturation.
Fig. 6 shows the flow diagram of 100 second embodiment of natural gas purification system provided by the embodiments of the present application, asks
Refering to Fig. 6.
TSA in the present embodiment is dehydrated de- hydrocarbon device 110 and TSA and takes off hydrocarbon protective device 200 and first embodiment
It is identical, it is no longer repeated herein.
One of second embodiment and the difference of first embodiment are:
In the present embodiment, natural gas purification system 100 does not include regeneration gas compression set 103, natural gas purification system
System 100 further includes natural gas compressing unit, and the inlet end of gas and natural gas compressing unit that regeneration gas escape pipe 240 exports connects
It connects, is delivered to natural gas compressing unit, then again into MDEA deacidifying device 101.
It should be noted that in this application, adsorption tower, dealkylation tower, compressor, separator, heater etc. can be adopted
With equipment common in chemical industry, pressure gauge, valve, bypass pipeline for needing to be arranged in natural gas purification system 100 etc. are
It can be arranged according to demand, the present embodiment will no longer repeat it；Correspondingly, described in this application " connection " can be with
The connection type appropriate in chemical industry equipment is selected, the present embodiment will not be described in great detail.
The major advantage of natural gas purification system 100 provided by the embodiments of the present application is:
TSA takes off hydrocarbon protective device 200 and is dehydrated again to the TSA gas for being dehydrated the de- output of hydrocarbon device 110, takes off heavy hydrocarbon；
TSA takes off the portioned product gas that hydrocarbon protective device 200 exports can be inputted the de- hydrocarbon protective device of the TSA as regeneration gas again
200 carry out adsorbent reactivation；It can be kept away in the case where entire 100 continuous service of natural gas purification system to adsorbent reactivation
The removing for exempting from heavy hydrocarbon and water is incomplete, heavy hydrocarbon and water can be caused to enter natural gas liquid to avoid because adsorbent reaches saturation
Makeup sets 102.
TSA takes off at least one of multiple dealkylation towers in hydrocarbon protective device 200 and carries out de- heavy hydrocarbon, dehydration, after by de- heavy hydrocarbon,
Dewatered portion gas is delivered in remaining dealkylation tower by air outlet valve regenerates adsorbent, is handed over after a period of time
It changes, so recycles, heavy hydrocarbon and water can be caused to enter natural gas liquefaction device 102 and frozen to avoid because adsorbent reaches saturation
It is stifled.
It includes multiple adsorption towers that TSA, which is dehydrated de- hydrocarbon device 110, is discharged by regeneration gas feed pipe, branch pipe 302, regeneration gas
The cooperation of the valves such as pipe 340 and regulating valve 301 makes part of adsorption tower carry out de- heavy hydrocarbon, dehydration, while rest part is inhaled
Attached tower carries out adsorbent and is regenerated, and swaps after a period of time；Ensure that heavy hydrocarbon in gas, the content of water are low, avoids cold
Case frozen block.So circulation can not take off heavy hydrocarbon, dehydration, avoid Cold box blocking and freezing after avoiding adsorbent from reaching saturation.
The application also provides a kind of natural gas purification method, comprising the following steps:
Unstripped gas after depickling, the de- hydrocarbon of dehydration is passed through the de- hydrocarbon protective device of TSA and is dehydrated heavy hydrocarbon again, the TSA is de-
Hydrocarbon protective device includes that at least two dealkylation towers take off hydrocarbon again；
The part that the TSA portion gas for taking off the output of hydrocarbon protective device is passed through in the de- hydrocarbon protective device of the TSA is taken off
Hydrocarbon tower regenerates adsorbent.
Further, it is above-mentioned adsorbent is regenerated after obtained gas be delivered to the air inlet of MDEA deacidifying device again
Mouth or TSA are dehydrated the air inlet of de- hydrocarbon device.
Further, in the present embodiment, the natural gas after MDEA deacidifying device depickling enters the de- hydrocarbon dress of TSA dehydration
It sets, the natural gas after being dehydrated de- heavy hydrocarbon takes off hydrocarbon protective device subsequently into TSA.Adsorption tower after heating regeneration is by regeneration air cooling
After being heated to 240 DEG C into the de- hydrocarbon heater of dehydration after blowing, enter regeneration gas after heating adsorbent bed heating into adsorption tower
It after cooler is cooled to 40 DEG C, enters back into regeneration gas subcooler and is cooled to 12 DEG C, regenerate gas separating device subsequently into de- hydrocarbon is dehydrated
After separation water outlet and heavy hydrocarbon, dehydration dealkylation tower entrance is returned.
Enter TSA from the natural gas for being dehydrated de- hydrocarbon unit and takes off the dealkylation tower of hydrocarbon protective device after protecting bed adsorption
Purified natural gas is sent into liquefaction unit.Bed after adsorption saturation introduces regeneration gas heating, then takes off hydrocarbon protection regeneration air cooling
Device is cooled to 40 degrees Celsius and returns to MDEA deacidifying device entrance by de- hydrocarbon protection regeneration air compressor pressurization after the meeting.
TSA takes off hydrocarbon protective device and is dehydrated heavy hydrocarbon again, and removing can be made more thorough, and it is defeated that the TSA takes off hydrocarbon protective device
Portion gas out is passed through the part dealkylation tower that the TSA takes off in hydrocarbon protective device and regenerates to adsorbent；Can to avoid because
For adsorbent reaches saturation and causes heavy hydrocarbon and water to enter ice chest and causes frozen block.
The foregoing is merely preferred embodiment of the present application, are not intended to limit this application, for the skill of this field
For art personnel, various changes and changes are possible in this application.Within the spirit and principles of this application, made any to repair
Change, equivalent replacement, improvement etc., should be included within the scope of protection of this application.
Claims (10)
1. a kind of natural gas purification system, which is characterized in that the natural gas purification system includes MDEA deacidifying device, TSA de-
Water takes off hydrocarbon device and TSA takes off hydrocarbon protective device；The TSA be dehydrated de- hydrocarbon device be connected to the MDEA deacidifying device with it is described
TSA takes off between hydrocarbon protective device, and the TSA takes off hydrocarbon protective device can be dehydrated the gas of de- hydrocarbon device output again to the TSA
Dehydration, de- heavy hydrocarbon；The TSA takes off hydrocarbon protective device or the TSA is dehydrated the portioned product gas of de- hydrocarbon device output as again
Anger can be inputted the TSA again and take off hydrocarbon protective device progress adsorbent reactivation.
2. natural gas purification system according to claim 1, which is characterized in that
The TSA takes off hydrocarbon protective device
At least two dealkylation towers, the gas that the dealkylation tower is used to be dehydrated the TSA de- hydrocarbon device output are dehydrated again, take off weight
Hydrocarbon；
Regeneration gas air inlet pipe, the regeneration gas air inlet pipe are connect with the dealkylation tower, for conveying regeneration gas for the dealkylation tower；
And
Regeneration gas escape pipe, the regeneration gas escape pipe are used to export the gas after carrying out adsorbent reactivation.
3. natural gas purification system according to claim 2, which is characterized in that
The air inlet or the TSA of the outlet side of the regeneration gas escape pipe and the MDEA deacidifying device are dehydrated de- hydrocarbon device
Air inlet connection；
Preferably, it further includes sequentially connected first regeneration Gas Cooler and the first regeneration gas point that the TSA, which takes off hydrocarbon protective device,
From device, the outlet side of the regeneration gas escape pipe is connect with the first regeneration Gas Cooler；The first regeneration gas separating device
For carrying out gas-liquid separation to the gas after the regeneration.
4. natural gas purification system according to claim 2, which is characterized in that
It further includes the first regeneration hot-air heater that the TSA, which takes off hydrocarbon protective device, and the first regeneration hot-air heater is used for described
Regeneration gas is heated.
5. natural gas purification system according to claim 2, which is characterized in that
The natural gas purification system further includes regeneration gas compression set, and the regeneration gas compression set is used to be the regeneration gas
The gas pressurized of escape pipe output.
6. natural gas purification system according to claim 1, which is characterized in that
The TSA is dehydrated de- hydrocarbon device
At least two adsorption towers, gas dewatering that the adsorption tower is used to export the MDEA deacidifying device take off heavy hydrocarbon；
Regeneration gas feed pipe, the regeneration gas feed pipe are connect with the adsorption tower, for conveying regeneration gas for the adsorption tower；
And
Regeneration gas discharge nozzle, the regeneration gas discharge nozzle are used to export the gas after the regeneration in the adsorption tower.
7. natural gas purification system according to claim 6, which is characterized in that
The outlet of the regeneration gas discharge nozzle is connect with the TSA air inlet for being dehydrated de- hydrocarbon device.
8. natural gas purification system according to claim 7, which is characterized in that
It further includes sequentially connected second regeneration Gas Cooler and the second regeneration gas separating device, institute that the TSA, which is dehydrated de- hydrocarbon device,
The outlet for stating regeneration gas discharge nozzle is connect with the second regeneration Gas Cooler, and the second regeneration gas separating device is used for described
Gas after regeneration carries out gas-liquid separation；
Optionally, it further includes the second regeneration hot-air heater that the TSA, which is dehydrated de- hydrocarbon device, and the second regeneration hot-air heater is used for
The regeneration gas is heated.
9. a kind of natural gas purification method characterized by comprising
Unstripped gas after depickling, the de- hydrocarbon of dehydration is passed through the de- hydrocarbon protective device of TSA and is dehydrated hydrocarbon again, the TSA takes off hydrocarbon protection
Device includes that at least two dealkylation towers take off hydrocarbon again；
The TSA is taken off into hydrocarbon protective device or the TSA is dehydrated the portion gas that de- hydrocarbon device exports and is passed through the de- hydrocarbon of the TSA
Part dealkylation tower in protective device regenerates adsorbent.
10. natural gas purification method according to claim 9, which is characterized in that
It is described adsorbent is regenerated after obtained gas be delivered to the air inlet or the TSA of MDEA deacidifying device again
It is dehydrated the air inlet of de- hydrocarbon device.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110479028A (en) * | 2019-08-28 | 2019-11-22 | 中天科技精密材料有限公司 | A kind of oil vapor treatment system |
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| CN206352130U (en) * | 2016-12-30 | 2017-07-25 | 四川杰瑞恒日天然气工程有限公司 | Natural qi exhaustion heavy hydrocarbon system |
| CN107774095A (en) * | 2016-08-25 | 2018-03-09 | 四川天采科技有限责任公司 | A kind of natural gas is dehydrated the full temperature journey pressure swing adsorption purge method of de- hydrocarbon simultaneously |
| CN209836108U (en) * | 2019-05-07 | 2019-12-24 | 成都赛普瑞兴科技有限公司 | Natural gas purification system |
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| CN107774095A (en) * | 2016-08-25 | 2018-03-09 | 四川天采科技有限责任公司 | A kind of natural gas is dehydrated the full temperature journey pressure swing adsorption purge method of de- hydrocarbon simultaneously |
| CN206352130U (en) * | 2016-12-30 | 2017-07-25 | 四川杰瑞恒日天然气工程有限公司 | Natural qi exhaustion heavy hydrocarbon system |
| CN209836108U (en) * | 2019-05-07 | 2019-12-24 | 成都赛普瑞兴科技有限公司 | Natural gas purification system |
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