CN206751751U - A kind of system that heavy hydrocarbon in natural gas is removed using domethanizing column - Google Patents
A kind of system that heavy hydrocarbon in natural gas is removed using domethanizing column Download PDFInfo
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- CN206751751U CN206751751U CN201720581111.5U CN201720581111U CN206751751U CN 206751751 U CN206751751 U CN 206751751U CN 201720581111 U CN201720581111 U CN 201720581111U CN 206751751 U CN206751751 U CN 206751751U
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- domethanizing column
- heavy hydrocarbon
- natural gas
- ice chest
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Abstract
It the utility model is related to a kind of system that heavy hydrocarbon in natural gas is removed using domethanizing column.System of the present utility model includes ice chest（1）, domethanizing column（2）, air intake heater（3）, demethanizer reboiler（4）, return tank（5）, reflux pump（6）With（Heavy hydrocarbon cooler 7）.First with domethanizing column（2）Rectifying section, return tank（5）And reflux pump（6）Heavy hydrocarbon in natural gas is thoroughly removed；Domethanizing column is utilized afterwards（2）The first stripping section, air intake heater（3）, domethanizing column（2）The second stripping section and demethanizer reboiler（4）By domethanizing column（2）The heavy hydrocarbon stripping of rectifying section separation further purification heavy hydrocarbon and reclaim light component therein, be sent to heavy hydrocarbon storage tank after obtained heavier hydrocarbon products cooling.System of the present utility model is in domethanizing column（2）There is provided two stripping sections, use the natural gas of heat and tower bottom reboiler to be used as stripping thermal source respectively, flow is simple, and process integration is high, and the stability of a system of the present utility model is good, and applicability is extensive, has very strong operability.
Description
Technical field
Liquefied natural gas (LNG) production field is the utility model is related to, in more particularly to a kind of removing natural gas using domethanizing column
The system of heavy hydrocarbon.
Background technology
In liquefied natural gas field, heavy hydrocarbon typically refers to C5 and above hydro carbons.Because these hydro carbons freezing points are of a relatively high,
If heavy hydrocarbon is not pre-separated out, there will be heavy hydrocarbon during natural gas deep cooling to freeze and the risk of occluding device.For
Ensure the normal work of natural gas liquefaction system, it is necessary to take measures heavy hydrocarbon therein to be taken off before natural gas enters deep cooling workshop section
Remove.
At present, the method for natural qi exhaustion heavy hydrocarbon has solid absorption method, solvent absorption, condensation separation method and membrane separation process.
Solid absorption method utilizes the solid absorbent with loose structure to enable hydrocarbon gas to the difference of hydrocarbon component adsorption capacity
The method of separation, this method flow is simple, has certain selectivity, but this method is not suitable for heavy hydrocarbons content height and processing
Measure big operating mode, the especially operating mode containing neopentane.And adsorbent need to be regularly replaced, power consumption is high during regeneration.Solvent absorption
Method process program strong adaptability, is not limited the heavy hydrocarbons content in natural gas, but this method flow is complicated, absorbent regeneration
When also consume big energy, the heavy hydrocarbon being removed will also enter follow-up dethanizer to reclaim lighter hydrocarbons, source of the gas group can not be adapted to
Divide the situation of rapid fluctuations.Membrane separation process more non-porous matter for dissolving diffusion mechanism using utilizing in the separation of natural gas lighter hydrocarbons
Film, gas membrane Seperation Technology have the advantages that technique is simple and convenient to operate, repairs easy and plant investment province, the party of making amends for one's faults
Division A League Matches of French Football alkane loss late is too high, up to 30%~40%, can not receive for liquefied natural gas (LNG) plant.Condensation separation method is also known as low temperature essence
Method is evaporated, using the difference of molten boiling point, carries out gas-liquid separation.It is that natural gas is cooled into required low temperature below hydrocarbon dew point temperature,
The lime set that part is rich in heavier hydro carbons is obtained, essence is exactly gas liquid technology.And so this method is used for day more at present
Right gas dew point control, to natural qi exhaustion heavy hydrocarbon lack of targeted, causes this method to be applied in area of natural gas liquefaction by very
Big limitation.
Utility model content
The purpose of this utility model is overcome the deficiencies in the prior art, reduces liquefaction and (has been taken off sour gas with natural gas, taken off
The natural gas of water, demercuration) de- heavy hydrocarbon process energy consumption, simplify natural qi exhaustion heavy hydrocarbon technique, and will be enriched in the de- heavy hydrocarbon mistake of heavy hydrocarbon
Journey couples with gas deliquescence process；So as to provide a kind of system that heavy hydrocarbon in natural gas is removed using domethanizing column, the system
Not only reclaimed qualified product from the natural gas rich in heavy hydrocarbon, increased technique added value, and meet heavy hydrocarbon component and
The demand that the big natural gas of changes of contents removes to heavy hydrocarbon, the strong adaptability of technique.
System of the present utility model by set a cryogenic rectification tower will be enriched in the de- heavy hydrocarbon process of heavy hydrocarbon natural gas with
Liquefaction process coupling is so as to which the heavy hydrocarbon in natural gas be removed, and the cryogenic rectification tower is provided with natural gas stripping and reboiler
Strip two stripping sections to purify for heavy hydrocarbon, the system includes：The first flow A1 of ice chest 1, second flow channel A2, third flow channel
A3, domethanizing column 2, air intake heater 3, demethanizer reboiler 4, return tank 5, reflux pump 6, heavy hydrocarbon cooler 7, the first valve
V1 to the 4th valve V4 and corresponding connecting pipe, wherein, unstripped gas natural gas line pass through the first valve V1 and ice chest 1 the
One runner A1 entrances are connected, are connected by the second valve V2 with the entrance of air intake heater 3；The middle part first of domethanizing column 2 is entered
Material mouth is exported by the first flow A1 of the 3rd valve V3 and ice chest 1 and connected；Domethanizing column bottom second charging aperture adds with air inlet
The outlet connection of hot device 3；The material mouth that flows back on the top of domethanizing column 2 is connected with the outlet of reflux pump 6；The top gas of domethanizing column 2
Mutually outlet is connected with the second flow channel A2 entrances of ice chest 1；The second flow channel A2 outlets connection of the charging aperture and ice chest 1 of return tank 5,
Top gas phase outlet is connected with the third flow channel A3 entrances of ice chest 1, bottom liquid phases export and the connection of the entrance of reflux pump 6；It is cold
The third flow channel A3 outlets of case 1 are connected with LNG product pipeline；The bottom of domethanizing column 2 sets demethanizer reboiler 4；Demethanation
The liquid-phase outlet of the bottom of tower 2 is connected with the entrance of heavy hydrocarbon cooler 7；Heavy hydrocarbon cooler 7 is exported through the 4th valve V4 and heavier hydrocarbon products
Pipeline connects.
Above-mentioned domethanizing column 2 is packed tower or plate column.
Above-mentioned domethanizing column 2 is provided with demister.
Above-mentioned reflux pump 6 is centrifugal pump, bucket bag pump, canned motor pump or reciprocating pump.
Above-mentioned demethanizer reboiler 7 is heat siphon type or kettle type reboiler.
The applicable raw material natural gas condition of system of the present utility model is：Pressure is 3.5~6.5MPa, and temperature is -20
~50 DEG C, the content of heavy hydrocarbon is 40~10000ppmv, and wherein neopentane content is 10~400ppmv, benzene content is 10~
600ppmv, C6 and above hydrocarbon content are 20~9000ppmv.
Neopentane content is not more than 10ppmv in natural gas after the utility model processing, and benzene content is not more than 4ppmv, C6
And above hydrocarbon content is not more than 10ppmv.
The content of ethane is not more than 2% in the heavier hydrocarbon products that the utility model obtains.
According to scheme of the present utility model, methane total recovery is not less than 99.0%, and the heavy hydrocarbon rate of recovery is not less than 99.0%, weight
Hydrocarbon separating energy consumption is minimum can be to 0.0012kWh/ (NM3Raw natural gas).
The technical solution of the utility model is provided with rectifying section and the domethanizing column of two sections of strippings, and using ice chest as returning
Flow condenser, so as to remove the heavy hydrocarbon in natural gas and easy frozen block component completely in domethanizing column rectifying section；With the natural of heat
Gas is stripped as demethanizer bottoms, and the particularly C2~C4 components recovery of the light component in heavy hydrocarbon is entered into LNG product, can be maximum
Change LNG product yield.The technical solution of the utility model is additionally provided with demethanizer reboiler, and heavy hydrocarbon depth is separated and carried
Pure, heavier hydrocarbon products purity is high；The technical solution of the utility model couples natural qi exhaustion heavy hydrocarbon process with liquefaction process simultaneously, work
Skill is easy, workable.
The advantages of the utility model and positive role are：
(1) using rectifying section and the domethanizing column of two sections of strippings is provided with, using ice chest second flow channel as reflux condenser,
Using raw material natural gas as one section of stripping of bottom of towe, two sections of strippings of bottom of towe, heavy hydrocarbon and easy frozen block are used as using demethanizer reboiler
Component separates thoroughly with light component, LNG product high income, and heavier hydrocarbon products purity is high；
(2) realize natural qi exhaustion heavy hydrocarbon process to couple with liquefaction process, and simplify natural qi exhaustion heavy hydrocarbon technological process,
Reduced investment, it is minimum up to 0.0012kWh/ (NM to take off heavy hydrocarbon specific energy consumption3Raw natural gas), operating cost is low, cost-effective,
So as to produce obvious economic benefit.
Brief description of the drawings
Fig. 1 is process flow diagram of the present utility model.
A. de- heavy hydrocarbon system of the present utility model；B. refrigeration system.
Code name implication is as follows in figure：
1. ice chest
2. domethanizing column
3. air intake heater
4. demethanizer reboiler
5. return tank
6. reflux pump
7. heavy hydrocarbon cooler
Embodiment
The utility model is explained with accompanying drawing with reference to embodiments
Embodiment 1
The concrete technology flow process of the present embodiment refers to Fig. 1.
A kind of system that heavy hydrocarbon in natural gas is removed using domethanizing column, including：First flow A1, the second of ice chest 1
Road A2, third flow channel A3, domethanizing column 2, air intake heater 3, demethanizer reboiler 4, return tank 5, reflux pump 6, heavy hydrocarbon are cold
But device 7, the first valve V1 to the 4th valve V4 and corresponding connecting pipe.Wherein, above-mentioned domethanizing column is packed tower, is set
There is demister；Reflux pump is canned motor pump；Demethanizer reboiler is kettle type reboiler.Unstripped gas natural gas line passes through the first valve
Door V1 is connected with the first flow A1 entrances of ice chest 1, is connected by the second valve V2 with the entrance of air intake heater 3；Demethanation
The middle part first charging aperture of tower 2 is exported by the first flow A1 of the 3rd valve V3 and ice chest 1 and connected；Domethanizing column bottom second
Charging aperture is connected with the outlet of air intake heater 3；The material mouth that flows back on the top of domethanizing column 2 is connected with the outlet of reflux pump 6；It is de-
The outlet of the top gas phase of methane tower 2 is connected with the second flow channel A2 entrances of ice chest 1；The charging aperture of return tank 5 and the second of ice chest 1
Road A2 outlets connection, top gas phase outlet are connected with the third flow channel A3 entrances of ice chest 1, bottom liquid phases export and reflux pump 6
The connection of entrance；The third flow channel A3 outlets of ice chest 1 are connected with LNG product pipeline；The bottom of domethanizing column 2 sets domethanizing column again
Boil device 4；The liquid-phase outlet of the bottom of domethanizing column 2 is connected with the entrance of heavy hydrocarbon cooler 7；Heavy hydrocarbon cooler 7 is exported through the 4th valve
V4 is connected with heavier hydrocarbon products pipeline.
Raw material natural gas from outside is introduced into system, the raw material natural gas is to have taken off sour gas, dehydration, taken off
Mercury, the natural gas rich in heavy hydrocarbon, flow 6450kg/h, pressure 6.5MPa, temperature are 40 DEG C, and heavy hydrocarbon total content is
970ppmv, wherein neopentane content are 140ppmv, and benzene content 280ppmv, C6 and above hydrocarbon content are 550ppmv.Will
85% raw material natural gas is sent into the first flow A1 of ice chest 1 through the first valve V1 and is cooled to -60 DEG C, obtains natural gas I；Naturally
Gas I enters rectifying in tower after the 3rd valve V3 decompressions from the middle part first charging aperture of domethanizing column 2, passes through domethanizing column 2
Rectifying section the heavy hydrocarbon in natural gas I is thoroughly removed；Meanwhile by remaining 15% raw material natural gas through the second valve
V2 feeding air intake heaters 3 are heated to 45 DEG C and are passed through domethanizing column 2 from bottom second charging aperture, and first in domethanizing column 2 carries
Evaporate the liquid phase that section obtains the upper rectifying section of domethanizing column 2 and carry out preliminary stripping purifying, while existed using demethanizer reboiler 4
The liquid phase that second stripping section of domethanizing column 2 obtains top further strips purifying, is -62 DEG C so as to which tower top obtains temperature
Natural gas II, bottom of towe obtain liquid phase I；Natural gas II is cooled to -67 DEG C through the second flow channel A2 of ice chest 1 and obtains the natural of partial condensation
Gas III, afterwards into the gas-liquid separation of return tank 5, isolated liquid phase II returns to the top of domethanizing column 2 as backflow, returns
The top of stream tank 5 obtains natural gas IV.In natural gas IV, neopentane content is 3ppmv, benzene content 0.05ppmv, C6 and with
Upper hydrocarbon content is 1ppmv.The further deep coolings of third flow channel A3 that natural gas IV returns to ice chest 1 extremely obtain LNG product for -167 DEG C.
Liquid phase I is decompressed to 2MPa through the 4th valve V4 again after heavy hydrocarbon cooler 7 cools down and obtains heavier hydrocarbon products.Second in heavier hydrocarbon products
The content of alkane is 2%.In above procedure, methane total recovery is 99.2%, and the heavy hydrocarbon rate of recovery is 99.5%, and heavy hydrocarbon separating energy consumption is
0.0015kW·h/(NM3Raw natural gas).
Claims (1)
1. a kind of system that heavy hydrocarbon in natural gas is removed using domethanizing column, it is characterised in that the system includes：Ice chest (1)
First flow (A1), second flow channel (A2), third flow channel (A3), domethanizing column (2), air intake heater (3), domethanizing column boil again
Device (4), return tank (5), reflux pump (6), heavy hydrocarbon cooler (7), the first valve (V1) connect to the 4th valve (V4) and accordingly
Adapter road, wherein, unstripped gas natural gas line is connected by the first valve (V1) with first flow (A1) entrance of ice chest (1),
It is connected by the second valve (V2) with the entrance of air intake heater (3)；The middle part first charging aperture of domethanizing column (2) passes through the 3rd
First flow (A1) outlet of valve (V3) and ice chest (1) connects；Domethanizing column bottom second charging aperture and air intake heater (3)
Outlet connection；The material mouth that flows back on domethanizing column (2) top is connected with the outlet of reflux pump (6)；Gas at the top of domethanizing column (2)
Mutually outlet is connected with second flow channel (A2) entrance of ice chest (1)；The charging aperture of return tank (5) and the second flow channel of ice chest (1)
(A2) outlet is connected, top gas phase outlet is connected with third flow channel (A3) entrance of ice chest (1), bottom liquid phases export and reflux pump
(6) connection of entrance；Third flow channel (A3) outlet of ice chest (1) is connected with LNG product pipeline；Domethanizing column (2) bottom is set
Put demethanizer reboiler (4)；The liquid-phase outlet of domethanizing column (2) bottom is connected with heavy hydrocarbon cooler (7) entrance；Heavy hydrocarbon cools down
Device (7) outlet is connected through the 4th valve (V4) with heavier hydrocarbon products pipeline.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720581111.5U CN206751751U (en) | 2017-05-24 | 2017-05-24 | A kind of system that heavy hydrocarbon in natural gas is removed using domethanizing column |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720581111.5U CN206751751U (en) | 2017-05-24 | 2017-05-24 | A kind of system that heavy hydrocarbon in natural gas is removed using domethanizing column |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206751751U true CN206751751U (en) | 2017-12-15 |
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ID=60620070
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720581111.5U Expired - Fee Related CN206751751U (en) | 2017-05-24 | 2017-05-24 | A kind of system that heavy hydrocarbon in natural gas is removed using domethanizing column |
Country Status (1)
| Country | Link |
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| CN (1) | CN206751751U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2727505C1 (en) * | 2019-01-09 | 2020-07-22 | Андрей Владиславович Курочкин | Unit for deethanization of main gas according to ltdr technology (embodiments) |
-
2017
- 2017-05-24 CN CN201720581111.5U patent/CN206751751U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2727505C1 (en) * | 2019-01-09 | 2020-07-22 | Андрей Владиславович Курочкин | Unit for deethanization of main gas according to ltdr technology (embodiments) |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CP02 | Change in the address of a patent holder |
Address after: 100015 room b12c402, No.10 Jiuxianqiao Road, Chaoyang District, Beijing Patentee after: BEIJING ENCRYO ENGINEERING Co.,Ltd. Address before: 100015 2nd floor, east side of B10, No.10 Jiuxianqiao Road, Chaoyang District, Beijing Patentee before: BEIJING ENCRYO ENGINEERING Co.,Ltd. |
|
| CP02 | Change in the address of a patent holder | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20171215 Termination date: 20200524 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |