CN205174996U - Cryogenic system for natural gas liquefaction - Google Patents
Cryogenic system for natural gas liquefaction Download PDFInfo
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- CN205174996U CN205174996U CN201520909791.XU CN201520909791U CN205174996U CN 205174996 U CN205174996 U CN 205174996U CN 201520909791 U CN201520909791 U CN 201520909791U CN 205174996 U CN205174996 U CN 205174996U
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- heavy hydrocarbon
- natural gas
- heat exchanger
- knockout drum
- cryogenic system
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Abstract
The utility model provides a cryogenic system for natural gas liquefaction, including the cryrogenic heat exchanger and with the cryrogenic refrigerating unit that the cryrogenic heat exchanger is connected, the cryrogenic heat exchanger includes natural gas runner and the refrigerant runner of being cut apart formation by the heat transfer pipe wall, the refrigerant runner with cryrogenic refrigerating unit connects, still include the heavy hydrocarbon knockout drum, natural gas runner includes that first -class section and second flow the section, first -class section with the lateral wall intercommunication of heavy hydrocarbon knockout drum, the second flow the section with the tank deck intercommunication of heavy hydrocarbon knockout drum, the knockout drum bottom still is connected with heavy hydrocarbon liquid discharge line. Heavy hydrocarbon discharge and sub zero treatment operation have been accomplished simultaneously to this cryogenic system, have cancelled original front end that is independent of the cryrogenic heat exchanger and have removed the heavy hydrocarbon heat exchanger, have simplified interplant equipment quantity, have reduced the operation cost and management input of mill, have also correspondingly reduced danger source quantity.
Description
Technical field
The utility model designing natural gas chemical technology field, particularly a kind of natural gas liquefaction cryogenic system.
Background technology
In natural gas liquefaction system, cryogenic system is the core system of whole factory.Because component in natural gas _ raw material gas is unstable, particularly wherein the content of neopentane is unstable, ice chest inner flow passage can be caused to block, make follow-up natural gas can not make plant downtime through ice chest heat exchange in cryogenic liquefying process.
In actual production, for preventing in natural gas heavy hydrocarbons blocking ice chest and cause whole plant downtime when subzero treatment, before cryogenic system, arrange one is carried out pre-cooling process heat exchanger and knockout drum to natural gas, natural gas temperature is reduced to-45--60 DEG C and make wherein heavy hydrocarbon liquefaction (condensing temperature of the heavy hydrocarbons such as neopentane is-45--60 DEG C) by heat exchanger.Through the natural gas becoming gas-fluid two-phase mixture of heat exchanger process enter carry out gas-liquid separation in knockout drum after gas phase is incorporated in ice chest again and carries out cryogenic liquefying and become liquefied natural gas.
Can expect, existing production system has himself shortcoming: first because heat exchanger needs low-temperature receiver to be lowered the temperature by its interior media, needing to be equipped with corresponding refrigeration system provides cold; Next is correspondingly heat exchanger, ice chest arranges refrigeration system respectively makes work in-plant equipment compare dispersion, needs more administrative staff and drop into larger operation cost to carry out integrated treatment and management and control; Again, cause dangerous matter sources in factory more like this, the equipment point that may have an accident increases.
Utility model content
Need to be equipped with the problem that corresponding heat exchanger carries out pretreatment discharge heavy hydrocarbon increase shop equipment quantity and Productive statistics before solving existing liquefied natural gas subzero treatment, the utility model provides a kind of new natural gas liquefaction cryogenic system.
The utility model provides a kind of natural gas liquefaction cryogenic system, the cryogenic refrigeration unit comprising deep-cooling heat exchanger and be connected with described deep-cooling heat exchanger; Described deep-cooling heat exchanger comprises splits by heat exchange tube wall the natural gas runner and refrigerant flow path that are formed; Described refrigerant flow path is connected with described cryogenic refrigeration unit; Also comprise heavy hydrocarbon knockout drum; Described natural gas runner comprises first-class section and second section; Described first-class section is communicated with the sidewall of described heavy hydrocarbon knockout drum; Described second section is communicated with the tank deck of described heavy hydrocarbon knockout drum; Heavy hydrocarbon liquid discharge line is also connected with bottom described knockout drum.
Optionally, described heavy hydrocarbon knockout drum sidewall also has liquid level sensor; Described heavy hydrocarbon liquid discharge line has control valve; Described liquid level sensor is connected with described control valve.
Optionally, described control valve is specially pneumatic control valve.
Optionally, also there is the heavy hydrocarbon storage tank be communicated with described heavy hydrocarbon liquid discharge line.
Optionally, described deep-cooling heat exchanger is the one in deep cooling ice chest, wound tube heat exchanger and shell-and-tube heat exchanger.
Optionally, described cryogenic refrigeration unit is the one in azeotrope refrigeration unit, swell refrigeration unit and cascade refrigeration unit.
Optionally, the heavy hydrocarbon heat exchanger be connected with described heavy hydrocarbon liquid discharge line is also comprised.
The natural gas liquefaction cryogenic system that the utility model provides, wherein the natural gas runner of deep-cooling heat exchanger comprises first-class section, second section, and first-class section is connected with heavy hydrocarbon knockout drum respectively with second section; The natural gas entering into first-class section of deep-cooling heat exchanger first carries out heat exchange process and becomes gas-liquid mixture and be separated heavy hydrocarbon liquid wherein through heavy hydrocarbon knockout drum, continue subzero treatment again form liquefied natural gas through second section.This cryogenic system completes heavy hydrocarbon simultaneously and discharges and subzero treatment operation, eliminate original front end independent of deep-cooling heat exchanger except heavy hydrocarbon heat exchanger, simplify number of devices in factory, the operation cost and the management that reduce factory drop into, and also correspondingly reduce dangerous matter sources quantity.
In the utility model one detailed description of the invention, heavy hydrocarbon storage tank is set and stores heavy hydrocarbon liquid marketing of going forward side by side and sell, reduce the emptying problem of heavy hydrocarbon, improve heavy hydrocarbon value and reduce pollution.
Accompanying drawing explanation
In order to be illustrated more clearly in the utility model embodiment or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only embodiments more of the present utility model, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings;
Fig. 1 is natural gas liquefaction cryogenic system schematic diagram in the utility model detailed description of the invention;
Wherein: 1-deep-cooling heat exchanger, 2-cryogenic refrigeration unit, first-class section of 11-, 12-second section, 13-refrigerant flow path, 3-heavy hydrocarbon knockout drum, 4-heavy hydrocarbon liquid discharge line, 5-control valve, 6-heavy hydrocarbon storage tank.
Detailed description of the invention
The utility model provides a kind of natural gas liquefaction cryogenic system, can cancel the equipment of subzero treatment unit front row except heavy hydrocarbon, improve the equipment operation cost of factory, reduces dangerous matter sources quantity.
Below in conjunction with the accompanying drawing in the utility model embodiment, be clearly and completely described the technical scheme in the utility model embodiment, obviously, described embodiment is only the utility model part embodiment, instead of whole embodiments.Based on the embodiment in the utility model, those of ordinary skill in the art are not making the every other embodiment obtained under creative work prerequisite, all belong to the scope of the utility model protection.
If Fig. 1, Fig. 1 are natural gas liquefaction cryogenic system schematic diagram in the utility model detailed description of the invention.The cryogenic refrigeration unit 2 that the natural gas liquefaction in the utility model comprises deep-cooling heat exchanger 1 with cryogenic system and is connected with deep-cooling heat exchanger 1 can be found out.Deep-cooling heat exchanger 1 comprises splits by heat exchange tube wall the natural gas runner and refrigerant flow path 13 that are formed, and refrigerant flow path 13 is connected with cryogenic refrigeration unit 2, for realizing circulating of cold-producing medium.
With cryogenic system of the prior art unlike: it also has heavy hydrocarbon knockout drum 3, natural gas runner comprises first-class section 11 and second section 12, wherein first-class section 11 is communicated with the sidewall of heavy hydrocarbon knockout drum 3, and second section 12 is communicated with the tank deck of heavy hydrocarbon knockout drum 3; Heavy hydrocarbon liquid discharge line 4 is also connected with bottom knockout drum.
In subzero treatment, through overcompression, purification and dried natural gas through entering into first-class section 11 of deep-cooling heat exchanger 1, to be reduced between-45--60 DEG C wherein heavy hydrocarbon component via temperature after heat exchange tube wall and refrigerant heat exchanger and to liquefy in this temperature range and to form gas-fluid two-phase mixture; Gas-fluid two-phase mixture enters into heavy hydrocarbon knockout drum 3 and is separated, and gas componant continues to form liquefied natural gas through second section 12 subzero treatment, and heavy hydrocarbon liquid is deposited in heavy hydrocarbon knockout drum 3 and discharge through heavy hydrocarbon liquid discharge line 4.
Because directly subzero treatment and the duplicate removal hydrocarbon liquid handling in early stage being integrated in a deep cooling heat-transmission device, eliminate the heavy hydrocarbon removal heat exchanger in early stage, therefore without the need to being equipped with corresponding refrigeration system, improve the integrated level of shop equipment, also just decrease that corresponding administrative staff drop into, operation cost and work in-plant equipment have an accident a quantity.
In the utility model one is specifically implemented, the inlet pressure of first-class section 11 can be controlled in about 6MPa, porch natural gas temperature at about 30 DEG C, and the outlet pressure of first-class section 11 when entering into heavy hydrocarbon knockout drum 3 controls at about 5MPa; The liquefied natural gas pressure of the formation after second section 12 subzero treatment in about 0.1-0.3MPa, temperature between-140--160 DEG C.
Because the pressure at heavy hydrocarbon knockout drum 3 place is comparatively large, and heavy hydrocarbon knockout drum 3 itself needs to ensure that gas phase composition enters second section 12 from the exhaust outlet of tank deck, therefore needs to ensure that in heavy hydrocarbon knockout drum 3, liquid level is in specified level.For this reason, in the utility model detailed description of the invention, also liquid level sensor can be set in heavy hydrocarbon knockout drum 3 sidewall capable certain height, the control valve 5 of control piper conducting is set in heavy hydrocarbon liquid discharge line 4, liquid level sensor is connected with control valve 5, whether open according to the level condition control and regulation valve 5 measured and discharge heavy hydrocarbon liquid.In embody rule, control valve 5 can be pneumatic control valve, also can be the control valve of other types, but should ensure explosion-proof performance.
During the utility model is specifically implemented, also have the heavy hydrocarbon storage tank 6 be communicated with heavy hydrocarbon liquid discharge line 4, the heavy hydrocarbon liquid of being discharged by heavy hydrocarbon liquid discharge line 4 can store and sell in heavy hydrocarbon storage tank 6.In addition, the heavy hydrocarbon of discharge also can be used as the fuel gas in factory, enters into combustion system and burn after the heat exchange of heavy hydrocarbon heat exchanger.
Above in said various assembly, deep-cooling heat exchanger 1 can be the one in deep cooling ice chest, wound tube heat exchanger and shell-and-tube heat exchanger, is wherein preferably deep cooling ice chest; Cryogenic refrigeration unit 2 can be the one in azeotrope refrigeration unit, swell refrigeration unit and cascade refrigeration unit, and the compressor in cryogenic refrigeration unit 2 can adopt the one in centrifugal compressor, reciprocating compressor or screw compressor.
Above the natural gas liquefaction cryogenic system in the utility model embodiment is described in detail.Apply specific case herein to set forth principle of the present utility model and embodiment; the explanation of above embodiment just understands core concept of the present utility model for helping; when not departing from the utility model principle; also can carry out some improvement and modification to the utility model, these improve and modify and also fall in protection domain of the present utility model.
Claims (7)
1. a natural gas liquefaction cryogenic system, the cryogenic refrigeration unit (2) comprising deep-cooling heat exchanger (1) and be connected with described deep-cooling heat exchanger (1); Described deep-cooling heat exchanger (1) comprises splits by heat exchange tube wall the natural gas runner and refrigerant flow path (13) that are formed; Described refrigerant flow path (13) is connected with described cryogenic refrigeration unit (2); It is characterized in that: also comprise heavy hydrocarbon knockout drum (3); Described natural gas runner comprises first-class section (11) and second section (12); Described first-class section (11) are communicated with the sidewall of described heavy hydrocarbon knockout drum (3); Described second section (12) is communicated with the tank deck of described heavy hydrocarbon knockout drum (3); Described heavy hydrocarbon knockout drum (3) bottom is also connected with heavy hydrocarbon liquid discharge line (4).
2. natural gas liquefaction cryogenic system according to claim 1, is characterized in that: described heavy hydrocarbon knockout drum (3) sidewall also has liquid level sensor; Described heavy hydrocarbon liquid discharge line (4) has control valve (5); Described liquid level sensor is connected with described control valve (5).
3. natural gas liquefaction cryogenic system according to claim 2, is characterized in that: described control valve (5) is specially pneumatic control valve.
4. the natural gas liquefaction cryogenic system according to Claims 2 or 3, is characterized in that: also have the heavy hydrocarbon storage tank (6) be communicated with described heavy hydrocarbon liquid discharge line (4).
5. natural gas liquefaction cryogenic system according to claim 4, is characterized in that: described deep-cooling heat exchanger (1) is the one in deep cooling ice chest, wound tube heat exchanger and shell-and-tube heat exchanger.
6. natural gas liquefaction cryogenic system according to claim 5, is characterized in that: described cryogenic refrigeration unit (2) is azeotrope refrigeration unit, one in swell refrigeration unit and cascade refrigeration unit.
7. natural gas liquefaction cryogenic system according to claim 1, is characterized in that: also comprise the heavy hydrocarbon heat exchanger be connected with described heavy hydrocarbon liquid discharge line (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520909791.XU CN205174996U (en) | 2015-11-16 | 2015-11-16 | Cryogenic system for natural gas liquefaction |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520909791.XU CN205174996U (en) | 2015-11-16 | 2015-11-16 | Cryogenic system for natural gas liquefaction |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205174996U true CN205174996U (en) | 2016-04-20 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201520909791.XU Active CN205174996U (en) | 2015-11-16 | 2015-11-16 | Cryogenic system for natural gas liquefaction |
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|---|---|
| CN (1) | CN205174996U (en) |
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- 2015-11-16 CN CN201520909791.XU patent/CN205174996U/en active Active
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