CN203429146U - Process device for removing heavy hydrocarbon in liquefaction process of natural gas - Google Patents
Process device for removing heavy hydrocarbon in liquefaction process of natural gas Download PDFInfo
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- CN203429146U CN203429146U CN201320472142.9U CN201320472142U CN203429146U CN 203429146 U CN203429146 U CN 203429146U CN 201320472142 U CN201320472142 U CN 201320472142U CN 203429146 U CN203429146 U CN 203429146U
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- heavy hydrocarbon
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- hydrocarbon removal
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Abstract
The utility model discloses a process device for removing heavy hydrocarbon in the liquefaction process of natural gas. The process device comprises a pre-cooler, a hydrocarbon liquid separator, an expander, a heavy hydrocarbon removal tower, a second throttling valve, a hydrocarbon removal cold box and a deethanizer which are connected in sequence, wherein a bottom outlet of the hydrocarbon liquid separator is connected with middle inlets of a first throttling valve, the hydrocarbon removal cold box and the heavy hydrocarbon removal tower in sequence; a top outlet of the heavy hydrocarbon removal tower is connected with upper inlets of a heavy hydrocarbon removal tower condenser, a heavy hydrocarbon removal tower return tank, a heavy hydrocarbon removal tower return pump and the heavy hydrocarbon removal tower in sequence; a top outlet of the deethanizer is connected with upper inlets of the hydrocarbon removal cold box, a deethanizer return tank, a deethanizer return pump and the deethanizer in sequence; a top outlet of the deethanizer return tank is connected with a shell pass inlet of an ethane gas heat exchanger; a tube pass outlet of the ethane gas heat exchanger is connected with middle inlets of the hydrocarbon removal cold box, a third throttling valve and the heavy hydrocarbon removal tower in sequence. The process device is good in heavy hydrocarbon removal effect, has the energy-saving and consumption-reducing effects.
Description
Technical field
The utility model relates to a kind of process unit that utilizes self pressure expansion refrigeration to remove heavy hydrocarbon in gas deliquescence process after natural gas via precooling, special in remove the process unit of heavy hydrocarbon for large-scale natural gas liquefaction process.
Background technology
Sweet natural gas all must be through degree of depth pre-treatment before liquefaction, comprising removing contained heavy hydrocarbon component, thereby effectively avoid Sweet natural gas impurity in liquefaction process to cause frozen block, especially heavy hydrocarbon component condensation under low temperature environment, freeze and the equipment such as blocking pipe, valve and plate-fin heat exchanger.Domestic and international existing Sweet natural gas removes heavy hydrocarbon method and mainly contains rectification method and absorption method, and in these two kinds of methods, Sweet natural gas is all under the condition of additional low-temperature receiver, adopts the method for rectifying or absorption to remove next step operation that enters natural gas liquefaction after heavy hydrocarbon.
At present natural gas liquefaction process is broadly divided into stepwise refrigeration cycle, azeotrope circulation and three kinds of modes of expansion cycles, and these three kinds of refrigeration techniques mesohigh Sweet natural gases are condensed to and liquidly to throttling-135 ~-155 ℃, are depressurized to normal pressure and store from gaseous state.In high-pressure natural gas, containing huge pressure energy, then by the process of voltage adjusting device pressure regulation, this part pressure energy is often by slatterning in vain, in addition, and because sharply step-down of Sweet natural gas, cooling are also very high to the requirement of voltage adjusting device and pipe-line equipment.If this part pressure energy is used, can realize energy-saving and cost-reducing object.
Therefore, design a kind of heavy hydrocarbon component that utilizes pressure energy of natural gas to remove to contain in Sweet natural gas imperative.
Utility model content
The utility model has overcome shortcoming of the prior art, and a kind of process unit that adopts decompressor to remove heavy hydrocarbon in Sweet natural gas is provided, and has the features such as energy consumption is low, recovery part cold.
The technical solution of the utility model is: in a kind of gas deliquescence process, remove the process unit of heavy hydrocarbon, comprise the pre-cooler, hydrocarbon liquid/gas separator, decompressor, de-heavy hydrocarbon tower, the second throttling valve, de-hydrocarbon ice chest and the deethanizing column that connect successively; The outlet at bottom of described hydrocarbon liquid/gas separator is connected with de-heavy hydrocarbon tower centre inlet with first throttle valve, de-hydrocarbon ice chest successively; The top exit of described de-heavy hydrocarbon tower is connected with the upper inlet of de-heavy hydrocarbon tower with de-heavy hydrocarbon tower condenser, de-heavy hydrocarbon tower return tank, de-heavy hydrocarbon tower reflux pump successively; The top exit of described deethanizing column is connected with the upper inlet of de-hydrocarbon ice chest, deethanizing column return tank, deethanizing column reflux pump and deethanizing column successively; The top exit of deethanizing column return tank is connected with the shell side import of ethane gas interchanger; The tube side outlet of ethane gas interchanger is connected with the centre inlet of de-heavy hydrocarbon tower with de-hydrocarbon ice chest, the 3rd throttling valve successively.
Compared with prior art, the utility model has the advantages that: utilize Sweet natural gas self pressure through the decompressor cooling of expanding, compare that to obtain natural gas temperature lower with throttling valve, decompressor can be connected to come recovery part energy with compressor or generator, realizes energy-conservation; Utilize the abundant exchange of ethane interchanger and de-hydrocarbon ice chest implement device self-energy, avoided additional low-temperature receiver, reduced investment, realized and having saved energy and reduce the cost; This device heavy hydrocarbon removal effect is good, and the heavy hydrocarbon component in Sweet natural gas is removed as much as possible, is conducive to follow-up liquefaction process, effectively avoids heavy hydrocarbon frozen block, has met the needs of natural gas liquefaction.
Accompanying drawing explanation
The utility model will illustrate by example and with reference to the mode of accompanying drawing, wherein:
Fig. 1 is structural representation of the present utility model.
Embodiment
In gas deliquescence process, remove a process unit for heavy hydrocarbon, as shown in Figure 1.
In figure: 1, pipeline; 2, pipeline; 3, pre-cooler; 4, pipeline; 5, hydrocarbon liquid/gas separator; 6, pipeline; 7, pipeline; 8, first throttle valve; 9, pipeline; 10, decompressor; 11, pipeline; 12, de-heavy hydrocarbon tower; 13, pipeline; 14, de-heavy hydrocarbon tower condenser; 15, pipeline; 16, de-heavy hydrocarbon tower return tank; 17, pipeline; 18, pipeline; 19, de-heavy hydrocarbon tower reflux pump; 20, pipeline; 21, pipeline; 22, pipeline; 23, the second throttling valve; 24, pipeline; 25, de-hydrocarbon ice chest 26, pipeline; 27, pipeline; 28, pipeline; 29, the 3rd throttling valve; 30, pipeline; 31, deethanizing column; 32, pipeline; 33, pipeline; 34, deethanizing column return tank; 35, pipeline; 36, pipeline; 37, deethanizing column reflux pump; 38, pipeline; 39, pipeline; 40, pipeline; 41, ethane gas interchanger; 42, pipeline; 43, pipeline; 44, generator.Wherein:
Pre-cooler 3 is connected with deethanizing column 31 with hydrocarbon liquid/gas separator 5, decompressor 10, de-heavy hydrocarbon tower 12, the second throttling valve 23, de-hydrocarbon ice chest 25 successively; Hydrocarbon liquid/gas separator 5 outlet at bottoms are connected with de-heavy hydrocarbon tower 12 centre inlet with first throttle valve 8, de-hydrocarbon ice chest 25 successively; Decompressor 10 is connected with generator 44; De-heavy hydrocarbon tower 12 top exits are connected with de-heavy hydrocarbon tower 12 upper inlet with de-heavy hydrocarbon tower condenser 14, de-heavy hydrocarbon tower return tank 16, de-heavy hydrocarbon tower reflux pump 19 successively; Deethanizing column 31 top exits are connected with de-hydrocarbon ice chest 25, deethanizing column return tank 34, deethanizing column reflux pump 37 and deethanizing column 31 upper inlet successively; Deethanizing column return tank 34 top exits are connected with the 41 shell side imports of ethane gas interchanger; The 41 tube side outlets of ethane gas interchanger are connected with de-hydrocarbon ice chest 25, the 3rd throttling valve 29 and de-heavy hydrocarbon tower 12 centre inlet successively.
Described decompressor 10 can adopt turbine technology to be connected with generator 44, also can adopt turbine technology to be connected with compressor.Described de-heavy hydrocarbon tower 12 can be that tray column can be also packing tower.
Principle of work of the present utility model is: from pipeline 1, after desulfurization, decarburization, dehydration, be divided into two bursts of logistics containing heavy hydrocarbon Sweet natural gas: one logistics enters pre-cooler 3 through pipeline 2 and enters hydrocarbon liquid/gas separator 5 after cooling and carry out gas-liquid separation, wherein: the Sweet natural gas gas phase after gas-liquid separation enters decompressor 10 through pipeline 6 and expands and by pipeline 11, from de-heavy hydrocarbon tower 12 lower inlet, enter de-heavy hydrocarbon tower 12 and carry out rectifying; Liquid phase after gas-liquid separation (hydrocarbon liquid), after pipeline 7 removes first throttle valve 8 reducing pressure by regulating flows, after pipeline 9 enters de-hydrocarbon ice chest 25 and cools, enters pipeline 27; Another burst of logistics, in pipeline 40 enters ethane gas interchanger 41, after gas phase heat exchange from deethanizing column return tank 34, enters de-hydrocarbon ice chest 25 coolings through pipeline 43, then enter pipeline 30 after pipeline 28 removes the 3rd throttling valve 29 reducing pressure by regulating flows;
Two bursts of logistics from pipeline 27 and pipeline 30 mix, and enter de-heavy hydrocarbon tower 12 carry out rectifying by pipeline 21 from de-heavy hydrocarbon tower 12 centre inlet, through rectifying, after the most of heavy hydrocarbon in Sweet natural gas is removed, from tower top, discharge;
From de-heavy hydrocarbon tower 12 tops Sweet natural gas out, by pipeline 13, enter de-heavy hydrocarbon tower condenser 14 coolings, by pipeline 15, entered in de-heavy hydrocarbon tower return tank 16 and carried out gas-liquid separation, the gas phase after separation (having removed the dry gas of heavy hydrocarbon) enters next step operation of natural gas liquefaction by pipeline 17; Liquid phase after separation enters into de-heavy hydrocarbon tower reflux pump 19 by pipeline 18, is sent to the top of de-heavy hydrocarbon tower 12 after supercharging by pipeline 20;
The liquid of de-heavy hydrocarbon tower 12 bottoms is entered and by pipeline 24, is sent into heat exchange in de-hydrocarbon ice chest 25 after the second throttling valve 23 reducing pressure by regulating flows and heat up by pipeline 22, then by pipeline 26, enters into deethanizing column 31 rectifying;
The overhead gas of deethanizing column 31 enters de-hydrocarbon ice chest 25 coolings by pipeline 32, by pipeline 33, enter deethanizing column return tank 34 and carry out gas-liquid separation: the gas phase after gas-liquid separation enters into 41 heat exchange of ethane gas interchanger by pipeline 35 and heats up, then by pipeline 42, send into factory's fuel gas system, the liquid phase after gas-liquid separation enters into the top that is sent to deethanizing column 31 after 37 superchargings of deethanizing column reflux pump by pipeline 38 by pipeline 36;
The deethanizing oil of deethanizing column 31 bottoms is sent into next step operation by pipeline 39 and is processed.
Claims (3)
1. in gas deliquescence process, remove a process unit for heavy hydrocarbon, it is characterized in that: comprise the pre-cooler, hydrocarbon liquid/gas separator, decompressor, de-heavy hydrocarbon tower, the second throttling valve, de-hydrocarbon ice chest and the deethanizing column that connect successively; The outlet at bottom of described hydrocarbon liquid/gas separator is connected with de-heavy hydrocarbon tower centre inlet with first throttle valve, de-hydrocarbon ice chest successively; The top exit of described de-heavy hydrocarbon tower is connected with the upper inlet of de-heavy hydrocarbon tower with de-heavy hydrocarbon tower condenser, de-heavy hydrocarbon tower return tank, de-heavy hydrocarbon tower reflux pump successively; The top exit of described deethanizing column is connected with the upper inlet of de-hydrocarbon ice chest, deethanizing column return tank, deethanizing column reflux pump and deethanizing column successively; The top exit of deethanizing column return tank is connected with the shell side import of ethane gas interchanger; The tube side outlet of ethane gas interchanger is connected with the centre inlet of de-heavy hydrocarbon tower with de-hydrocarbon ice chest, the 3rd throttling valve successively.
2. in a kind of gas deliquescence process according to claim 1, remove the process unit of heavy hydrocarbon, it is characterized in that: described de-heavy hydrocarbon tower is tray column or packing tower.
3. in a kind of gas deliquescence process according to claim 1, remove the process unit of heavy hydrocarbon, it is characterized in that: described decompressor is connected with generator or compressor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320472142.9U CN203429146U (en) | 2013-08-05 | 2013-08-05 | Process device for removing heavy hydrocarbon in liquefaction process of natural gas |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320472142.9U CN203429146U (en) | 2013-08-05 | 2013-08-05 | Process device for removing heavy hydrocarbon in liquefaction process of natural gas |
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| Publication Number | Publication Date |
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| CN203429146U true CN203429146U (en) | 2014-02-12 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201320472142.9U Expired - Lifetime CN203429146U (en) | 2013-08-05 | 2013-08-05 | Process device for removing heavy hydrocarbon in liquefaction process of natural gas |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103409188A (en) * | 2013-08-05 | 2013-11-27 | 中国石油集团工程设计有限责任公司 | Process unit and method for removing heavy hydrocarbon during liquefaction process of natural gas |
| CN108546227A (en) * | 2018-06-28 | 2018-09-18 | 中国石油工程建设有限公司 | A kind of process unit and method of separation ethane and carbon dioxide |
-
2013
- 2013-08-05 CN CN201320472142.9U patent/CN203429146U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103409188A (en) * | 2013-08-05 | 2013-11-27 | 中国石油集团工程设计有限责任公司 | Process unit and method for removing heavy hydrocarbon during liquefaction process of natural gas |
| CN108546227A (en) * | 2018-06-28 | 2018-09-18 | 中国石油工程建设有限公司 | A kind of process unit and method of separation ethane and carbon dioxide |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20180116 Address after: 610041 Chengdu high tech Zone, Sichuan province sublimation Road No. 6 Patentee after: CHINA PETROLEUM ENGINEERING & CONSTRUCTION Corp. Address before: 610041 Chengdu high tech Zone, Sichuan province sublimation Road No. 6 Patentee before: CNPC ENGINEERING DESIGN Co.,Ltd. |
|
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20140212 |