CN102127478B - Method and device for increasing light hydrocarbon yield of natural gas purification treatment station - Google Patents

Method and device for increasing light hydrocarbon yield of natural gas purification treatment station Download PDF

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Publication number
CN102127478B
CN102127478B CN 201110028815 CN201110028815A CN102127478B CN 102127478 B CN102127478 B CN 102127478B CN 201110028815 CN201110028815 CN 201110028815 CN 201110028815 A CN201110028815 A CN 201110028815A CN 102127478 B CN102127478 B CN 102127478B
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China
Prior art keywords
resurgent gases
natural gas
light hydrocarbon
outlet
pressure
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Expired - Fee Related
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CN 201110028815
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CN102127478A (en
Inventor
赵勇
谭绍泉
刘吉东
沈健
王玉军
陈亮
余袁园
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China Petroleum and Chemical Corp
Sinopec Shengli Oilfield Co Oil and Gas Gathering and Transportation
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China Petroleum and Chemical Corp
Sinopec Shengli Oilfield Co Oil and Gas Gathering and Transportation
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Abstract

The invention relates to a method for increasing the light hydrocarbon yield of a natural gas purification treatment station, which is characterized by comprising the following steps of: introducing regenerated gases into a regenerated gas separator and leading out from the rear side of an outlet valve of a natural gas export pipeline, wherein the regenerated gases are led out from the natural gas export pipeline at an outlet of an expansion machine, is heated and then enter a drying tower to regenerate a molecule sieve of the drying tower; introducing the regenerated gases to an associated gas import pipeline of a compressor after pressure regulation; reducing the pressure of the regenerated gases from 1MPa to 0.1MPa, therefore, the outlet pressure of the expansion machine can be reduced to 0.95MPa at lowest, the expansion ratio can be increased to 2.66, and the light hydrocarbon can be increased by 2.6T every day.

Description

A kind of natural gas conditioning treatment station improves the method and the device of light hydrocarbon yield
Technical field
The present invention relates to method and device that a kind of natural gas conditioning treatment station improves light hydrocarbon yield, solve because existing installation is aging and can not improve ratio of expansion, improve the problem of light hydrocarbon yield by improving the decompressor inlet pressure.
Background technology
At present the used decompressor running status of Shengli Oil Field natural gas conditioning treatment station reduce year by year along with Sweet natural gas tolerance and the change of makings poor, off-design parameter, intake pressure by 3.9Mp drop to 2.7Mpa, top hole pressure drops to 1.25Mpa by 1.4Mpa, ratio of expansion drops to 2.16 by 2.7, rotating speed drops to 28000 rev/mins by 34000 rev/mins, and the reduction of ratio of expansion directly influences the yield of lighter hydrocarbons.Ratio of expansion=expander inlet pressure/decompressor top hole pressure, the efficient key that improves lighter hydrocarbons are that what use is made of existing installation and processing condition improve the intake pressure of decompressor or the top hole pressure of reduction decompressor.
Summary of the invention
The purpose of this invention is to provide method and device that a kind of natural gas conditioning treatment station improves light hydrocarbon yield, thereby improve the yield that ratio of expansion improves lighter hydrocarbons by reducing the decompressor top hole pressure.
Technical scheme of the present invention realizes in the following manner:
1, proceeds from the reality according to the mechanism of ratio of expansion=expander inlet pressure/decompressor top hole pressure and find out the practical method that improves ratio of expansion.
1. improve ratio of expansion from the forward thought angle
Improved ratio of expansion normally in the past, all be to improve ratio of expansion by the intake pressure that improves decompressor, because of the decompressor outlet connects gas external transport pipeline, the defeated outward pressure of Sweet natural gas is for overcoming the external transport pipeline resistance, satisfy the user to Natural Gas Demand, the defeated outward pressure of Sweet natural gas is definite value, about 1Mpa fluctuation slightly up and down, can only improve the intake pressure of decompressor.
Under the prerequisite of ageing equipment, be with certain risk that old equipment has been done the experiment of short duration of raising ratio of expansion, experiment effect is limit " improve expander inlet pressure and improve the ratio of expansion data sheet " table 1 as follows
Improve expander inlet pressure as can be seen from above data sheet and improve ratio of expansion, improve the lighter hydrocarbons income, although be to emit structure deteriorate and flow process to be put in order the experiment of carrying out in the quick-fried danger in ageing equipment, it is very little to improve ratio of expansion, light hydrocarbon yield is very low, and compressor current consumption sharply increases.On the basis of the expander inlet pressure 2.7Mpa that runs well, expander inlet pressure is brought up to 3.0Mpa, power consumption 5000kw.h/d overcharges lighter hydrocarbons 0.56T, amount to 2800 yuan of Renminbi, deduct 3000 yuan also negative Renminbi 200 yuans of the electricity charge, though expander inlet pressure is brought up to the 3.1-3.3Mpa economic benefit increase than the Da Fu degree is arranged, but compressor safe handling scope head and shoulders above, existing installation is not fill to be permitted, from then on show data and find out, improve light hydrocarbon yield and can not realize guaranteeing to improve ratio of expansion by improving expander inlet pressure on the basis that existing aging equipment runs well.
How on the basis of existing installation, to open up the potentiality of flow process, improve ratio of expansion, improving light hydrocarbon yield is scientific and technical personnel's merit pass problem, also is firmly to carry out the Party Central Committee to call each industrial and mining enterprises of the whole nation to carry out the latent spiritual only way of increasing economic efficiency of equipment control.
2. improve ratio of expansion from the reverse thinking angle
Can not realize that from improving expansion intake pressure raising ratio of expansion method scientific and technical personnel just find out the breach from reducing the decompressor top hole pressure, improve ratio of expansion, improve the lighter hydrocarbons income.
Reduce the decompressor top hole pressure and improve ratio of expansion, improve light hydrocarbon yield technical scheme realize in the following manner:
To enter the resurgent gases of drying tower through heating from what decompressor export gas external transport pipeline was drawn to the regenerating molecular sieve of drying tower, draw the outlet valve back that enters gas external transport pipeline from the resurgent gases separator, enter the associated gas inlet line of compressor after the treated pressure regulation, the pressure of resurgent gases is dropped to 0.1Mpa by 1Mpa, thereby can be with the minimum 0.95Mpa that drops to of decompressor top hole pressure, ratio of expansion can bring up to 2.66, and lighter hydrocarbons can increase 2.6T every day.
Concrete implementing procedure is as follows:
A kind of natural gas conditioning treatment station improves the light hydrocarbon yield device, it is characterized in that a kind of natural gas conditioning treatment station improves the device of light hydrocarbon yield by reflux pipeline G 8, by reflux pipeline G 8The regeneration water cooler S that is connected in series 5, resurgent gases separator S 6, with resurgent gases separator S 6Two resurgent gases dust filter unit S that are connected in parallel 9, S 10With at two resurgent gases dust filter unit S 9, S 10Set stopping valve reaches at the set bypass pneumatic diaphragm control valve F in stopping valve next door on the outlet reflux pipeline 8Form; The set resurgent gases separator outlet valve F of resurgent gases outlet of the import of regeneration water cooler and drying tower A, B in the former natural purifying treatment flow process, C 6Inlet line connect the radial compressor S in resurgent gases dust filter unit outlet reflux pipeline and the raw natural gas purifying treatment flow process 1Inlet line connects.
Concrete experiment effect is as follows
Reduce expansion South Exit pressure and improve ratio of expansion data sheet (table 2)
Compared with the prior art the present invention has the following advantages:
1, the experiment number from table 1 and table 2 reduces decompressor top hole pressure raising expander inlet pressure raising ratio of expansion as can be seen, improves the light hydrocarbon yield economize on electricity, remarkable in economical benefits;
2, the present invention improves ratio of expansion, and improving light hydrocarbon yield is to reduce operating pressure, is convenient to operational safety;
3, resurgent gases is after treatment unit of the present invention is handled, and inclusion-free, temperature, pressure approach the temperature and pressure that the oil field part is given birth to Sweet natural gas, can not produce the natural gas conditioning treatment scheme and impact operating safety.
Description of drawings
Accompanying drawing-flowage structure scheme of installation of the present invention
Number description
Pipeline:
G 1-associated gas pipeline G 2-device portal pipeline G 3-system cooling working procedure pipeline G 4-deethanizing column is to decompressor pipeline G 5-defeated outward dry gas pipeline G 6-resurgent gases is advanced process furnace pipeline G 7-resurgent gases goes out drying tower pipeline G 8-reflux pipeline G 9-ice chest is to liquid hydrocarbon separator pipeline G 10Dry gas pipeline G after the-re-heat 11-cold blowing tracheae line G 12-liquid hydrocarbon removes liquefied gas tower pipeline
Equipment:
S 1-radial compressor S 2-gas holder S 3-horizontal separator S 4-resurgent gases process furnace A, B, C-drying tower S 5-resurgent gases water cooler S 6-resurgent gases separator S 7-resurgent gases water cooler (newly) S 8-resurgent gases separator (newly) S 9, S 10-resurgent gases dust filter unit S 11-decompressor S 12-liquid hydrocarbon separator S 13-ice chest S 14-deethanizing column S 15-vertical separator
Valve
F 1-radial compressor inlet valve F 2-gas holder inlet valve F 3-high pressure associated gas inlet valve F 4-defeated outward dry gas pressure regulator valve F 5-regeneration air stream adjustable valve F 6-resurgent gases separator outlet valve F 7-resurgent gases is to water cooler inlet valve (newly) F that regenerates 8-pneumatic diaphragm control valve
Drying tower 18 big valve numberings:
A 11-drying tower A tower absorption inlet valve A 12-drying tower A tower absorption outlet valve A 21-drying tower A tower regeneration outlet valve A 22-drying tower A tower regeneration inlet valve A 31-drying tower A tower cold blowing inlet valve A 32-drying tower A tower cold blowing outlet valve B 11-drying tower B tower absorption inlet valve B 12-drying tower B tower absorption outlet valve B 21-drying tower B tower regeneration outlet valve B 22-drying tower B tower regeneration inlet valve B 31-drying tower B tower cold blowing inlet valve B 32-drying tower B tower cold blowing outlet valve C 11-drying tower C tower absorption inlet valve C 12-drying tower C tower absorption outlet valve C 21-drying tower C tower regeneration outlet valve C 22-drying tower C tower regeneration inlet valve C 31-drying tower C tower cold blowing inlet valve C 32-drying tower C tower cold blowing outlet valve
Embodiment
Reduce the decompressor top hole pressure and improve ratio of expansion, the technical scheme that improves light hydrocarbon yield realizes in the following manner:
To enter drying tower through heating the resurgent gases of the regenerating molecular sieve of drying tower is drawn from the outlet valve back that the resurgent gases separator enters gas external transport pipeline from what decompressor export gas external transport pipeline was drawn, enter the associated gas inlet line of compressor after the treated pressure regulation, the pressure of resurgent gases is dropped to 0.1Mpa by 1Mpa, thereby can with the decompressor top hole pressure is minimum may be to 0.95Mpa, ratio of expansion can bring up to 2.66, and lighter hydrocarbons can increase 2.6T every day.
A kind of raising light hydrocarbon yield device is characterized in that a kind of natural gas conditioning treatment station improves the device of light hydrocarbon yield by reflux pipeline G 8, by reflux pipeline G 8The regeneration water cooler S that is connected in series 5, resurgent gases separator S 6, with resurgent gases separator S 6Two resurgent gases dust filter unit S that are connected in parallel 9, S 10With at two resurgent gases dust filter unit S 9, S 10Set stopping valve reaches at the set bypass pneumatic diaphragm control valve F in stopping valve next door on the outlet reflux pipeline 8Form; The set resurgent gases separator outlet valve F of resurgent gases outlet of the import of regeneration water cooler and drying tower A, B in the former natural purifying treatment flow process, C 6Inlet line connect the radial compressor S in resurgent gases dust filter unit outlet reflux pipeline and the raw natural gas purifying treatment flow process 1Inlet line connects.
Its working process and principle of work are as follows: associated gas is through G 1, pass through F 1And F 2Control enters S respectively 1And S 2, at S 2Buffering under guarantee to S 1Air feed is steady, through S 1The pressure of the associated gas of compression is brought up to 2.7Mpa by 0.1Mpa, and temperature is brought up to 40 ℃ by normal temperature, through G 2And F 3Control enters S 3Separate, again through S 15Separate, deviate from free-water, through A 11Or B 11Or C 11Enter A or B or C and carry out drying absorption and further dewater, through A 12Or B 12Or C 12Discharge, through G 3Enter S 13Condensation is through G 9Enter S 12Carry out liquid hydrocarbon and separate, enter S again 11Expand, then enter S 14Deethanizing has taken off gas behind the ethane through G 4Enter S 13Re-heat, temperature are elevated to normal temperature after G 10Enter S 11The pressurized end supercharging through G 5Outer defeated, through S 14The liquid hydrocarbon of deviating from is through G 12Enter following liquefaction steam flow journey.To drying tower A or B or the C after the associated gas absorption, need be G 5In the outer gas transmission throttling part of part through G 6And F 5Regulate control and enter S 4Heat 260 ℃ through G 6And A 22Or B 22Or C 22Enter A or B or C it is heated to the temperature that absorption needs, prepare for next step adsorbs associated gas; Or through G 11And C 31Or B 31Or A 31Enter C or B or A with outer gas transmission to C or B or A cooling, then from C 32Or B 32Or A 32Outflow is through G 11Enter G 5, drying tower A, B, C are carrying out the program of absorption, heating, cooling respectively in turn, guarantee drying tower efficient, creation point of the present invention be with to the gas after A or B or the C heating through G 7Enter S 5S is advanced in cooling again 6Gas separated is directly used G 8From S 6Outlet draw, through S 7Cooling through S 8Separate, by the S of parallel connection 9And S 10Filter, through F 8Pressure regulation enters S 1Rather than enter through F 4Natural gas line after the pressure regulation has so just reduced the top hole pressure of decompressor, and because of the drying tower adsorption cycle, heating period and cooling switching time cooling period all are 8 hours, and from the external transport pipeline G in decompressor exit 5The flow of drawing resurgent gases is 2000m 3/ h, pressure are 1.25Mpa, get back to compression inlet and press 0.1Mpa very big to the top hole pressure influence of decompressor, obviously reduce the top hole pressure of decompressor, have just improved ratio of expansion and light hydrocarbon yield under the constant situation of expander inlet pressure.

Claims (1)

1. a natural gas conditioning treatment station improves the light hydrocarbon yield device, it is characterized in that a kind of natural gas conditioning treatment station improves the device of light hydrocarbon yield by reflux pipeline G 8, by reflux pipeline G 8The regeneration water cooler S that is connected in series 5, resurgent gases separator S 6, with resurgent gases separator S 8Two resurgent gases dust filter unit S that are connected in parallel 9, S 10With at two resurgent gases dust filter unit S 9, S 10Set stopping valve reaches at the set bypass pneumatic diaphragm control valve F in stopping valve next door on the outlet reflux pipeline 8Form; The set resurgent gases separator outlet valve F of resurgent gases outlet of the import of regeneration water cooler and drying tower A, B in the former natural purifying treatment flow process, C 6Inlet line connect the radial compressor S in resurgent gases dust filter unit outlet reflux pipeline and the raw natural gas purifying treatment flow process 1Inlet line connects.
CN 201110028815 2011-01-20 2011-01-20 Method and device for increasing light hydrocarbon yield of natural gas purification treatment station Expired - Fee Related CN102127478B (en)

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Publication number Priority date Publication date Assignee Title
CN103254955B (en) * 2013-05-02 2014-12-24 中国海洋石油总公司 Closed-type three-tower molecular sieve dehydration device
CN107216923A (en) * 2017-06-27 2017-09-29 成都深冷液化设备股份有限公司 The composite bed adsorbent equipment of natural gas pretreatment

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1743436A (en) * 2005-09-27 2006-03-08 华南理工大学 Natural gas liquefying method for gas peak regulation and light hydrocarbon recovery

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1743436A (en) * 2005-09-27 2006-03-08 华南理工大学 Natural gas liquefying method for gas peak regulation and light hydrocarbon recovery

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