CN208059407U - Methanol-to-olefins Methane offgas produces the device of natural gas and hydrogen - Google Patents
Methanol-to-olefins Methane offgas produces the device of natural gas and hydrogen Download PDFInfo
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- CN208059407U CN208059407U CN201820866647.6U CN201820866647U CN208059407U CN 208059407 U CN208059407 U CN 208059407U CN 201820866647 U CN201820866647 U CN 201820866647U CN 208059407 U CN208059407 U CN 208059407U
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Abstract
The utility model discloses the devices that methanol-to-olefins Methane offgas produces natural gas and hydrogen, including first-class heat exchanger, secondary heat exchanger, level-one gas-liquid separator, two level gas-liquid separator, rectifying column, put forward hydrogen unit, methanation unit, drying unit and air inlet pipe, air inlet pipe is connect with level-one gas-liquid separator, level-one gas-liquid separator is connect with rectifying column, rectifying column is connect with hydrogen unit is carried, it carries hydrogen unit to connect with methanation unit, methanation unit is connect with two level gas-liquid separator.Cryogenic separation and carry hydrogen production device by methanol-to-olefins Methane offgas methane, hydrogen and C2 and C2+ extract, and by C2 and C2+ alkene class I liquid Is return separation of olefins master device, reduce the consumption of raw material, reduce operating cost；Recycled the active ingredient in tail gas by the technique, it can be achieved that tail gas whole recycling, increase device income, there is preferable economic benefit.
Description
Technical field
The utility model is related to the methanol-to-olefins field of coal chemical industry, more particularly to a kind of methanol-to-olefins methane tail
Gas produces the device of natural gas and hydrogen.
Background technology
The methanol-to-olefins device that China has been constructed and put into operation at present is more than 20 sets, and project in construction also has 11 sets, is based on first
The low feature of alcohol olefin product one content of gas carbon, and investment and operating cost requirement, it is all having put into operation and
The methanol-to-olefins project founded a capital is only with propylene refrigeration technique, cascade refrigeration or hybrid refrigeration without adding ethylene using propylene
Technique, due to the limitation of cryogen, methanol-to-olefins product gas separating technology temperature is all at -40 DEG C or more, such carbon one and carbon two
It is difficult to efficiently separate, in order to avoid ethylene loss, the relatively low liquid carbon three of price, four washing absorption of carbon of supercooling are all used,
However, due to containing a large amount of hydrogen and part nitrogen in Methane offgas, the partial pressure of liquid phase material certainly will be reduced, therefore in methane tail
Also containing gas-phase carbon two, carbon three or carbon four in gas, these materials are finally all burned off with Methane offgas together as fuel gas, and one
Ethylene, propylene and the washing absorption material that a typical methanol-to-olefins device loses from Methane offgas every year are worth 30,000,000
It is more than member.
For most of methanol-to-olefins devices, this strand of Methane offgas is It is not necessary to make fuel gas, only because not having
There is better purposes to be just forced to give other enterprises as fuel gas or with extremely cheap price, or even the enterprise having directly will
This strand of Methane offgas torch of setting fire is burnt up in vain.According to incompletely statistics, China has gone into operation and in the methanol-to-olefins device built
Downstream unit is required for a certain amount of hydrogen, and the hydrogen used in these devices is not produced from Methane offgas, is mostly used
Hydrogen from methyl alcohol, hydrogen from methyl alcohol technique not only high energy consumption, but also a large amount of methanol feedstocks of consumption, the resolution gas of generation is almost without utilization
Value, and the hydrogen recycling 30-40% in Methane offgas is used with regard to enough downstream units.In addition, China's natural gas resource compares
Scarcity, along with present coal changes gas policy, LNG is just wellr sold and in short supply.There has been no returned methanol-to-olefins Methane offgas at present
The device of receipts, the synthesis gas separation of similar Chinese patent CN200810145954.6 combinations and LNG production methods and system, can incite somebody to action
Feed stream comprising carbon monoxide, hydrogen and methane is separated into the air-flow comprising carbon monoxide and hydrogen and comprising the liquefaction of methane
Air-flow, but cannot be satisfied the demand for recycling the methanol-to-olefins Methane offgas of the utility model.
Utility model content
In view of this, the purpose of this utility model is to provide a kind of methanol-to-olefins Methane offgas to produce natural gas and hydrogen
The device of gas may be implemented efficiently making full use of for resource, reduce the pollution to environment, reduce enterprise's consumption of raw materials, has weight
Big economic interests and realistic meaning.
One side according to the present utility model provides the dress that methanol-to-olefins Methane offgas produces natural gas and hydrogen
It sets, including first-class heat exchanger, secondary heat exchanger, level-one gas-liquid separator, two level gas-liquid separator, rectifying column, puies forward hydrogen unit, first
Alkylation unit, drying unit and air inlet pipe, the air inlet pipe connect by first-class heat exchanger and the inlet end of level-one gas-liquid separator
It connects, the rectifying column is equipped with feed inlet and gas outlet, and the outlet side of the level-one gas-liquid separator is with pipeline through secondary heat exchanger
It is connect with the feed inlet of rectifying column, the rectifying column gas outlet after secondary heat exchanger and first-class heat exchanger and carries hydrogen list with pipeline
The feed end connection of member, the hydrogen unit that carries are equipped with hydrogen discharge end and tail gas discharge end, the tail gas discharge end and methanation
The feed end of unit connects, the discharge end of the methanation unit with pipeline after first-class heat exchanger and secondary heat exchanger with two level
The feed end of gas-liquid separator connects.The Methane offgas of methanol-to-olefins enters level-one gas after first-class heat exchanger cools down as a result,
Liquid/gas separator isolates the hydro carbons that liquid phase is C2 or more and sends dethanizer back to.Gas phase is sent to rectifying column rectifying and isolates LNG product
Send low-temperature storage tank or become CNG products after ice chest rewarming, be sent into after top gaseous phase component rewarming carry hydrogen unit extraction 99% with
On hydrogen.Hydrogen is sent to hydrogen users after compression.Tail gas is sent into methanation unit and turns CO therein and hydrogen as far as possible
Methane is turned to, then cooling enters two level gas-liquid separator again after drying unit is dried, tank bottom liquid phase material is sent into LNG rectifying
Tower, tank deck fixed gas are sent into the drier regenerative system of master device after heat exchanger heats.
In some embodiments, it further includes refrigeration system that methanol-to-olefins Methane offgas, which produces natural gas and the device of hydrogen,
System, the rectifying column are additionally provided with liquid outlet, refrigeration feed inlet and refrigeration discharge port, and the discharge end and refrigeration of the refrigeration system are defeated
Go out pipeline connection, refrigeration export pipeline is connect through first-class heat exchanger and secondary heat exchanger with refrigeration feed inlet, and described freeze
Material mouth connect with refrigeration reflux pipeline, and the refrigeration reflux pipeline runs through secondary heat exchanger and first-class heat exchanger and refrigeration system
Feed end connects to form refrigerating circuit.
In some embodiments, it further includes finished product day that methanol-to-olefins Methane offgas, which produces natural gas and the device of hydrogen,
Right gas export pipeline, the finished product natural gas export pipeline go out liquid with the liquid outlet of rectifying column and two level gas-liquid separator respectively
End connection.
In some embodiments, it further includes that mixed hydrocarbon is defeated that methanol-to-olefins Methane offgas, which produces natural gas and the device of hydrogen,
Go out pipeline, the mixed hydrocarbon export pipeline is connect with the outlet end of level-one gas-liquid separator.
In some embodiments, it further includes that tail gas is defeated that methanol-to-olefins Methane offgas, which produces natural gas and the device of hydrogen,
Go out pipeline, one end of the tail gas export pipeline is connect with the gas output end of two level gas-liquid separator, the tail gas efferent duct
The other end of line runs through secondary heat exchanger and first-class heat exchanger.
In some embodiments, the first-class heat exchanger, secondary heat exchanger, level-one gas-liquid separator, two level gas-liquid point
It is installed in ice chest from device and rectifying column.It can be convenient for, by cold concentration, saving energy consumption, while can also make whole system knot as a result,
Structure is compact.
In some embodiments, it further includes that tower top is cold that methanol-to-olefins Methane offgas, which produces natural gas and the device of hydrogen,
Condenser, the overhead condenser are equipped with inlet end, outlet side and reflux end, the inlet end of the overhead condenser and rectifying column
Gas outlet connects, and the outlet side of the overhead condenser is connect with the feed end for carrying hydrogen unit, the reflux of the overhead condenser
End is connect with the top of rectifying column.
The utility model has the beneficial effects that：Using cryogenic separation and carry hydrogen production device will be in methanol-to-olefins Methane offgas
Methane, hydrogen and C2 and C2+ are extracted, and realize that Methane offgas efficiently uses, and C2 and C2+ alkene class I liquid Is are returned to alkene
Master device is detached, reduces the consumption of raw material, reduces operating cost；The active ingredient in tail gas has been recycled by the technique,
Whole recycling that tail gas can be achieved, increase device income, have preferable economic benefit.
Description of the drawings
Fig. 1 is that the methanol-to-olefins Methane offgas of one embodiment of the utility model produces the device of natural gas and hydrogen
Flow diagram；
Fig. 2 is the structure of the rectifying column for the device that methanol-to-olefins Methane offgas shown in FIG. 1 produces natural gas and hydrogen
Schematic diagram.
Specific implementation mode
Utility model is described in further detail below in conjunction with the accompanying drawings.
Fig. 1 and Fig. 2 schematically shows a kind of methanol-to-olefins methane tail of embodiment according to the present utility model
Gas produces the device of natural gas and hydrogen.
Referring to Figures 1 and 2, the device that methanol-to-olefins Methane offgas produces natural gas and hydrogen include first-class heat exchanger 1,
Secondary heat exchanger 2, two level gas-liquid separator 4, rectifying column 5, carries hydrogen unit 6, methanation unit 7, does level-one gas-liquid separator 3
Dry unit 8, refrigeration system 9, air inlet pipe 10, finished product natural gas export pipeline 11, mixed hydrocarbon export pipeline 12, tail gas export pipeline 13
With overhead condenser 14.
Air inlet pipe 10 is connect by first-class heat exchanger 1 with the feed end of level-one gas-liquid separator 3, level-one gas-liquid separator 3
Feed end be arranged at the middle part of level-one gas-liquid separator 3.The Methane offgas that the domethanizing column of methanol-to-olefins product gas generates
It is inputted from air inlet pipe 10, after first-class heat exchanger 1 is cooled to -70~-65 DEG C, is sent into level-one gas-liquid separator 3 and carries out gas-liquid
Separation.The top of level-one gas-liquid separator 3 is equipped with outlet side, and bottom is equipped with outlet end.C2 and C2+ in Methane offgas is cold
It is solidifying, separator bottom is flowed to, light component is discharged from top outlet side and send to secondary heat exchanger, is cooled to -165~-155 DEG C,
It forms two material of gas-liquid and is mutually sent into the progress rectifying of rectifying column 5.
Rectifying column 5 is equipped with feed inlet 51, gas outlet 52, liquid outlet 53, refrigeration feed inlet 54 and refrigeration discharge port 55.Charging
Mouth 51 is set to the middle part of rectifying column 5, and gas outlet 52 is set to the top of rectifying column 5, and liquid outlet 53 is set to the bottom of rectifying column 5
End.The outlet side of level-one gas-liquid separator 3 is connect through secondary heat exchanger 2 with the feed inlet 51 of rectifying column 5 with pipeline, into rectifying
Material in tower 5 further isolated LNG (liquefied natural gas) and nitrogen hydrogen.The liquid outlet 53 of LNG from rectifying column 5 is defeated
Go out, nitrogen hydrogen is exported from the gas outlet of rectifying column 5 52.
The gas outlet 52 of rectifying column 5 with pipeline after secondary heat exchanger 2 and first-class heat exchanger 1 with propose the charging of hydrogen unit 6
End connection, nitrogen hydrogen, which enters, to be carried hydrogen unit 6 and is detached.
It carries hydrogen unit 6 and is equipped with hydrogen discharge end 61 and tail gas discharge end 62, carry hydrogen unit 6 film may be used and put forward hydrogen, transformation
Absorption carries the processes such as hydrogen separation hydrogen, and the hydrogen that purity is 99% or more can be obtained, and hydrogen is exported from hydrogen discharge end 61
It is sent to hydrogen users after compression afterwards.Tail gas discharge end 62 is connect with the feed end of methanation unit 7, and tail gas discharge end 62 will carry
Hydrogen tail gas is transported to the synthesis of methanation unit 7 and produces methane.The discharge end of methanation unit 7 connects with the feed end of drying unit 8
It connects, the charging of the discharge end of drying unit 8 with pipeline after first-class heat exchanger 1 and secondary heat exchanger 2 with two level gas-liquid separator 4
End connection.The moisture that contains in the synthesis gas that methanation unit 7 makes, its dew point is down to -65 after drying unit 8~-
70 DEG C, drying unit 8 is using the moisture in molecular sieve absorbing process removing synthesis gas.The material that drying unit 8 exports enters
Ice chest is cooled to -165~-155 DEG C through first-class heat exchanger 1 and secondary heat exchanger 2, is re-fed into the progress of two level gas-liquid separator 4
Gas-liquid separation respectively obtains LNG and hydrogen nitrogen tail gas.
The outlet end with the liquid outlet of rectifying column 5 53 and two level gas-liquid separator 4 respectively of finished product natural gas export pipeline 11
Connection.The output of the outlet end of the liquid outlet 53 of rectifying column 5 and two level gas-liquid separator 4 be LNG and CNG (compressed natural gas) at
Product, LNG foldbacks return heat exchanger rewarming and CNG (compressed natural gas) can be obtained.Finished product natural gas export pipeline 11 goes out with rectifying column 5
Control valve is respectively equipped on the pipeline that liquid mouth 53 is connected with the outlet end of two level gas-liquid separator 4, when the discharge of controllable liquid
Between and discharge rate.
One end of tail gas export pipeline 13 is connect with the gas output end of two level gas-liquid separator 4, tail gas export pipeline 13
The other end run through secondary heat exchanger 2 and first-class heat exchanger 1.The hydrogen nitrogen tail gas that two level gas-liquid separator 4 is isolated returns to two level
It can be used as regeneration gas use after 1 rewarming of heat exchanger 2 and first-class heat exchanger.
Mixed hydrocarbon export pipeline 12 is connect with the outlet end of level-one gas-liquid separator 3.What level-one gas-liquid separator 3 condensed out
C2 and C2+ liquid pressurizes by pump, after returning to heat exchanger rewarming, send to separation of olefins master device recovered material.Mixed hydrocarbon efferent duct
Line 12 is equipped with control valve, the efflux time and discharge rate of controllable liquid.
First-class heat exchanger 1, secondary heat exchanger 2, level-one gas-liquid separator 3, two level gas-liquid separator 4 and rectifying column 5 are pacified
In ice chest, it would be desirable to which the component for carrying out heat exchange concentrates in together, and can concentrate cold, facilitates heat exchange.Put forward hydrogen unit 6, first
Alkylation unit 7, drying unit 8 and refrigeration system 9 are arranged at outside ice chest.
Overhead condenser 14 is equipped with inlet end, outlet side and reflux end, inlet end and the rectifying column 5 of overhead condenser 14
Gas outlet 52 connects, and the outlet side of overhead condenser 14 is connect with the feed end for carrying hydrogen unit 6, the reflux end of overhead condenser 14
It is connect with the top of rectifying column 5.
The discharge end of refrigeration system 9 is connect with refrigeration export pipeline 91, and refrigeration export pipeline 91 runs through 1 He of first-class heat exchanger
Secondary heat exchanger 2 is connect with refrigeration feed inlet 54.Refrigeration discharge port 55 is connect with refrigeration reflux pipeline 92, and freeze reflux pipeline 92
It connect to form refrigerating circuit with the feed end of refrigeration system 9 through secondary heat exchanger 2 and first-class heat exchanger 1.Refrigeration system 9 can adopt
With modes such as cascade refrigeration, azeotrope refrigeration, nitrogen refrigeration and swell refrigerations.
The utility model is using cryogenic separation and carries hydrogen production device by methane, hydrogen and the C2 in methanol-to-olefins Methane offgas
And C2+ is extracted, and is realized that Methane offgas efficiently uses, and C2 and C2+ alkene class I liquid Is are returned to separation of olefins master device, is subtracted
The consumption for having lacked raw material, reduces operating cost；The active ingredient in tail gas has been recycled by the technique, has increased device receipts
Benefit has preferable economic benefit.
Above-described is only some embodiments of the utility model.For those of ordinary skill in the art,
Without departing from the concept of the present invention, various modifications and improvements can be made, these belong to practical new
The protection domain of type.
Claims (7)
1. methanol-to-olefins Methane offgas produces the device of natural gas and hydrogen, it is characterised in that:Including first-class heat exchanger (1),
Secondary heat exchanger (2), two level gas-liquid separator (4), rectifying column (5), carries hydrogen unit (6), methane at level-one gas-liquid separator (3)
Change unit (7), drying unit (8) and air inlet pipe (10), the air inlet pipe (10) is by first-class heat exchanger (1) and level-one gas-liquid point
Inlet end connection from device (3), the rectifying column (5) are equipped with feed inlet (51) and gas outlet (52), the level-one gas-liquid separation
The outlet side of device (3) is connect through secondary heat exchanger (2) with the feed inlet (51) of rectifying column (5) with pipeline, and the rectifying column (5) goes out
Gas port (52) is connect after secondary heat exchanger (2) and first-class heat exchanger (1) with the feed end for carrying hydrogen unit (6) with pipeline, described
It carries hydrogen unit (6) and is equipped with hydrogen discharge end (61) and tail gas discharge end (62), the tail gas discharge end (62) and methanation unit
(7) feed end connection, the discharge end of the methanation unit (7) is with pipeline through first-class heat exchanger (1) and secondary heat exchanger (2)
It is connect afterwards with the feed end of two level gas-liquid separator (4).
2. methanol-to-olefins Methane offgas according to claim 1 produces the device of natural gas and hydrogen, it is characterised in that:
Further include refrigeration system (9), the rectifying column (5) is additionally provided with liquid outlet (53), refrigeration feed inlet (54) and refrigeration discharge port
(55), the discharge end of the refrigeration system (9) is connect with refrigeration export pipeline (91), and refrigeration export pipeline (91) is changed through level-one
Hot device (1) and secondary heat exchanger (2) are connect with refrigeration feed inlet (54), the refrigeration discharge port (55) and refrigeration reflux pipeline
(92) it connects, the refrigeration reflux pipeline (92) is through secondary heat exchanger (2) and first-class heat exchanger (1) and refrigeration system (9)
Feed end connects to form refrigerating circuit.
3. methanol-to-olefins Methane offgas according to claim 2 produces the device of natural gas and hydrogen, it is characterised in that:
Further include finished product natural gas export pipeline (11), the finished product natural gas export pipeline (11) goes out liquid with rectifying column (5) respectively
Mouth (53) is connected with the outlet end of two level gas-liquid separator (4).
4. methanol-to-olefins Methane offgas according to claim 1,2 or 3 produces the device of natural gas and hydrogen, feature
It is:Further include mixed hydrocarbon export pipeline (12), the mixed hydrocarbon export pipeline (12) and the outlet end of level-one gas-liquid separator (3) connect
It connects.
5. methanol-to-olefins Methane offgas according to claim 1,2 or 3 produces the device of natural gas and hydrogen, feature
It is:Further include tail gas export pipeline (13), the gas of one end and two level gas-liquid separator (4) of the tail gas export pipeline (13)
Body output end connects, and the other end of the tail gas export pipeline (13) runs through secondary heat exchanger (2) and first-class heat exchanger (1).
6. methanol-to-olefins Methane offgas according to claim 1 produces the device of natural gas and hydrogen, it is characterised in that:
The first-class heat exchanger (1), secondary heat exchanger (2), level-one gas-liquid separator (3), two level gas-liquid separator (4) and rectifying column
(5) it is installed in ice chest.
7. methanol-to-olefins Methane offgas according to claim 1 produces the device of natural gas and hydrogen, it is characterised in that:
Further include overhead condenser (14), the overhead condenser (14) is equipped with inlet end, outlet side and reflux end, the overhead condensation
The inlet end of device (14) is connect with the gas outlet (52) of rectifying column (5), the outlet side of the overhead condenser (14) and carries hydrogen list
The feed end connection of first (6), the reflux end of the overhead condenser (14) is connect with the top of rectifying column (5).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820866647.6U CN208059407U (en) | 2018-06-05 | 2018-06-05 | Methanol-to-olefins Methane offgas produces the device of natural gas and hydrogen |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201820866647.6U CN208059407U (en) | 2018-06-05 | 2018-06-05 | Methanol-to-olefins Methane offgas produces the device of natural gas and hydrogen |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108679930A (en) * | 2018-06-05 | 2018-10-19 | 北京恒泰洁能科技有限公司 | Methanol-to-olefins Methane offgas produces the device of natural gas and hydrogen |
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2018
- 2018-06-05 CN CN201820866647.6U patent/CN208059407U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108679930A (en) * | 2018-06-05 | 2018-10-19 | 北京恒泰洁能科技有限公司 | Methanol-to-olefins Methane offgas produces the device of natural gas and hydrogen |
| CN108679930B (en) * | 2018-06-05 | 2024-04-09 | 北京恒泰洁能科技有限公司 | Device for preparing natural gas and hydrogen from tail gas of methanol-to-olefin methane |
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