CN100420732C - Process for lyophilization and heavy hydrocarbon removal of petroleum natural gas - Google Patents
Process for lyophilization and heavy hydrocarbon removal of petroleum natural gas Download PDFInfo
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- CN100420732C CN100420732C CNB2006100462330A CN200610046233A CN100420732C CN 100420732 C CN100420732 C CN 100420732C CN B2006100462330 A CNB2006100462330 A CN B2006100462330A CN 200610046233 A CN200610046233 A CN 200610046233A CN 100420732 C CN100420732 C CN 100420732C
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Abstract
The present invention relates to a freezing process for the dehydration and the heavy hydrocarbon removal of petroleum natural gas for purifying petroleum natural gas. The process comprises: wet petroleum natural gas is input into a heat regenerator to exchange heat with cold dry gas; then, cooled raw gas passes through a vapor-liquid separator with a built-in internal evaporator and evaporates in the evaporator by a cooling medium provided by a refrigeration unit to condense and separate water and light petroleum in the raw gas so as to achieve a good purifying effect on the dehydration and the heavy hydrocarbon removal of the petroleum natural gas. The freezing process of the dehydration and the heavy hydrocarbon removal of petroleum natural gas has the advantages of simple technical process for equipment, less investment, low energy consumption, good purifying effect, etc. The process can solve the freezing problem cause by that the temperature drops below freezing point when a traditional freezing process is adopted, and obtain the good petroleum gas purifying effect.
Description
Technical field:
The present invention relates to a kind of processing method that is used for oilfield gathering station oil and gas purifying treatment, belong to the defeated treatment technology class of oil and gas collection.
Background technology:
Oil and gas (abbreviation petroleum gas) often contained water and a small amount of lower boiling heavy hydrocarbon that is higher than dew-point temperature before handling without retrieving arrangement, particularly in the pipeline that big jar of getter of viscous crude is housed, water content even up to 50%, descend along with gas temperature in the course of conveying in the winter time, the nature condensation will appear in moisture and lightweight oil, very easily cause pipeline to freeze stifled and equipment is flame-out or security incident such as detonation.For preventing that security incident from taking place, secondary or pretreatment processs such as heating for multiple times, admixture deicing fluid in the way are adopted on cold district petroleum gas delivering pipe road usually at present.Though aforesaid method equipment is simple, less investment exists problem and shortage such as big, the uncontrollable factor of secondary resource consumption is many, often falls flat, and accident still.Traditional petroleum gas dewatering mainly contains two kinds of absorption method and cold methods.Absorption method is that a kind of solid (molecular sieve) or liquid (methyl alcohol, ethylene glycol etc.) sorbent material of utilizing removes the moisture in the Sweet natural gas, the former has, and dehydration is complete, the purity advantages of higher, but energy consumption is big, complicated operation, need thermal regeneration, add the requirement of firebreak, make the plant area area big, therefore, only be used for light ends unit usually; The latter dewaters not exclusively, and seriously polluted, cost of raw materials used is big, generally the emergency schedule when winter, natural gas line or equipment froze the situation of blocking up.Though traditional direct cold method dehydration can remove the part moisture content in the petroleum gas, because of service temperature is reduced to the frozen problem that produces below freezing, the method that the cycle of need taking switches is solved, thereby the cost height, weak effect.
Summary of the invention:
The object of the invention is to provide a kind of dehydration to take off the effective and process simplification of heavy hydrocarbon, less investment, process for lyophilization and heavy hydrocarbon removal of petroleum natural gas that the Sweet natural gas energy consumption is little.
Technical scheme of the present invention is as follows: this kind oil and gas purifying treatment method is with wet oil and gas input regenerator and cold dry gas heat exchange, unstripped gas after will lowering the temperature then is provided with the vapour liquid separator of vaporizer by inside, provide refrigerant by unit cooler, make unstripped gas in vaporizer, cool off, evaporate, and wherein water and lightweight oil condensation separation are come out, finally reach the good purifying treatment effect of taking off heavy hydrocarbon.
Implementation step of the present invention is as follows:
1, will wet oil and gas input regenerator and wherein cold dry gas heat exchange;
2, after the unstripped gas temperature is reduced to 5～20 ℃, enter the vapour liquid separator that inside is provided with vaporizer, provide refrigerant (freonll-11, propane, ammonia etc.) in vaporizer, to evaporate, and guarantee the required cold of lyophilization process by unit cooler;
3, unstripped gas passes vaporizer from bottom to top with the flow velocity of 0.3-1.5m/s and is cooled gradually from the vapour liquid separator lower sides access arrangement of cutting sth. askew, the limit cooling, limit condensation, limit washing, play local rectification effect, make and take off the hydrocarbon effect than a condensation effect raising about 10～20%;
4, after unstripped gas passes vaporizer, after temperature drops to dehydration degree of depth required value, go out vapour liquid separator and enter regenerator again, cold dry gas is entered outer gas line network by behind re-heat to 15～30 ℃, water that condensation is got off and lightweight oil then are deposited in the separator bottom, reclaim or blowdown by pipeline respectively, small part water is with the form of frost and hydro carbons hydrate or be frozen in the evaporator fin surface, splashes into the separator bottom when waiting ice-melt.Because whole flow process adopts a separator, water that condensation is come out and lightweight oil are deposited in the separator bottom, the medial temperature of lime set can not be lower than 0 ℃ generally speaking, and is therefore, hot as long as carry out the ribbon heater companion at separator bottom and bilge discharge pipe line in winter of cold;
5, the petroleum gas lyophilization takes off the automatic control of lighter hydrocarbons equipment configuration work:
The present invention carry out equipment configuration that petroleum gas lyophilization and heavy hydrocarbon removal decontamination process adopted and technical process by regenerator, vapour liquid separator, vaporizer, deadweight safety valve, unit cooler, insert teletransmission temperature take into account corresponding input, the output connection line is formed.Under normal operation, wet oil enters the regenerator heat exchange after pipeline feeds vapour liquid separator, in the vaporizer that sets within it, evaporate, condensed water and heavy hydrocarbon are settled down to the vapour liquid separator bottom respectively, drain by the recycling of recovering of vaporized hydrocarbons pipeline or by blowdown pipeline, dry gas then is fed back to regenerator by pipeline, gas line network outside pipeline is delivered to.Liquid-steam separator provides refrigerant by unit cooler, and arranged outside has deadweight safety valve, and the inboard is provided with insert teletransmission thermometer, is respectively applied for the automatic control of device work.In the course of the work, after boiler channel is frozen into certain thickness by frost and hydro carbons hydrate, when petroleum gas flows through the vaporizer resistance drop and reaches 0.02～0.05MPa, the deadweight safety valve that is arranged on the vapour liquid separator outside is opened automatically, petroleum gas without evaporator cools directly enters vapour liquid separator by the conduit that is inserted into vapour liquid separator inside, and conduit outlet is in the face of insert teletransmission thermometer probe.When thermometer temperature during than high 3-5 ℃ of vapour liquid separator top setting operation temperature, the electric signal immediate command refrigeration compressor of thermometer is shut down; At this moment, vaporizer also stops to provide cold, and the Sweet natural gas from regenerator still can pass the passage of vaporizer, is agglomerated in frost and the cooling of hydro carbons hydrate on the evaporator fin vias inner walls, also reaches the purpose of evaporator fin wall ice-melt simultaneously.Behind refrigeration compressor auto stop 5-30 minute (the auto stop time requires to determine according to the dehydration degree of depth), time relay action, robot control system(RCS) order refrigeration compressor starts once more.
Advantages such as process for lyophilization and heavy hydrocarbon removal of petroleum natural gas provided by the invention has that the equipment configuration technical process adopted is simple, less investment, energy consumption are low, good purification, utilize this method to solve to adopt tradition directly during freezing method owing to temperature is reduced to the frozen problem that produces below freezing, obtain good petroleum gas decontamination effect improving.
Description of drawings:
Accompanying drawing is adopted equipment configuration, process flow diagram by the present invention.
Embodiment:
The present invention is provided by following examples, below in conjunction with accompanying drawing the present invention is further described.
As shown in the figure, equipment configuration technical process of the present invention is made up of regenerator 1, vapour liquid separator 2, vaporizer 3, deadweight safety valve 4, insert teletransmission thermometer 5, unit cooler 6 and corresponding connection line, its technical process annexation is as follows: regenerator 1 top is connected with dry gas intake pipeline 8 from vapour liquid separator 2 with wet petroleum gas intake pipeline 7 respectively, and the bottom is connected with dry gas export pipeline 10 after the purifying treatment with the wet petroleum gas pipeline 9 of input vapour liquid separator 2 respectively; The middle part is provided with vaporizer 3 in the vapour liquid separator 2, and top is provided with insert teletransmission thermometer 5 probes, and vapour liquid separator 2 outsides are provided with and are attached thereto logical deadweight safety valve 4; Vapour liquid separator 2 bottoms pick out recovering of vaporized hydrocarbons gate pipeline 11 and sewage discharge gate pipeline 12 respectively, and sidewall is provided with the refrigerant circulation line 13 that links to each other with unit cooler 6.
Embodiment: according to technique scheme provided by the invention and implementation step at oil-gas gathering and transportation station, Chinese Liaohe Oil Field to the petroleum gas heavy hydrocarbon purifying treatment work of dewatering.In this process, s main working parameters is as follows: wet petroleum gas in regenerator with cold dry gas heat exchange, unstripped gas enters vapour liquid separator after reducing to 10 ℃; The flow velocity that unstripped gas passes vaporizer is 1.5m/s; Go out vapour liquid separator after unstripped gas is reduced to-5 ℃ and advance regenerator; Enter outer gas line network after the cold dry gas re-heat to 28 ℃; The lime set medial temperature is 3 ℃.This time in the implementation process, handling oil tolerance is 6000-15000Nm
3/ d, the gas dew point temperature after the processing reaches-25 ℃～-30 ℃, satisfies the personal and outer gas transmission requirement of being incorporated into the power networks in mining area, obtains the 1.5t/d lightweight oil simultaneously, remarkable in economical benefits.
Claims (1)
1. process for lyophilization and heavy hydrocarbon removal of petroleum natural gas, it is characterized in that: this method is with wet oil and gas input regenerator and cold dry gas heat exchange, unstripped gas after will lowering the temperature then is provided with the vapour liquid separator of vaporizer by inside, provide refrigerant by unit cooler, make unstripped gas in vaporizer, cool off, evaporate, and wherein water and lightweight oil condensation separation are come out, finally reach the purifying treatment effect that oil and gas takes off heavy hydrocarbon;
The implementation step of this method is as follows:
(1), will wet oil and gas input regenerator and cold dry gas heat exchange;
(2), after the unstripped gas temperature reduces to 5～20 ℃, enter the vapour liquid separator that inside is provided with vaporizer, provide refrigerant in vaporizer, to evaporate by unit cooler, and guarantee the required cold of lyophilization process;
(3), unstripped gas passes vaporizer from bottom to top with the flow velocity of 0.3-1.5m/s and is cooled gradually from the vapour liquid separator lower sides access arrangement of cutting sth. askew, the limit cooling, the limit condensation, local rectification effect is played in the limit washing;
(4), after unstripped gas passes vaporizer, after temperature drops to dehydration degree of depth required value, go out vapour liquid separator and enter regenerator again, cold dry gas is entered outer gas line network by behind re-heat to 15～30 ℃, water that condensation is got off and lightweight oil then are deposited in the separator bottom, reclaim or blowdown by pipeline respectively, small part water is with the form of frost and hydro carbons hydrate or be frozen in the evaporator fin surface, splashes into the separator bottom when waiting ice-melt.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100462330A CN100420732C (en) | 2006-03-31 | 2006-03-31 | Process for lyophilization and heavy hydrocarbon removal of petroleum natural gas |
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2006100462330A CN100420732C (en) | 2006-03-31 | 2006-03-31 | Process for lyophilization and heavy hydrocarbon removal of petroleum natural gas |
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| Publication Number | Publication Date |
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| CN1844334A CN1844334A (en) | 2006-10-11 |
| CN100420732C true CN100420732C (en) | 2008-09-24 |
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Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102008004077A1 (en) * | 2008-01-12 | 2009-07-23 | Man Diesel Se | Process and apparatus for the treatment of natural gas for use in a gas engine |
| CN101508923B (en) * | 2009-03-12 | 2012-10-10 | 西安长庆科技工程有限责任公司 | Dehydration and de-heavy hydrocarbon apparatus and process for natural gas |
| SG177246A1 (en) * | 2009-07-30 | 2012-02-28 | Exxonmobil Upstream Res Co | Systems and methods for removing heavy hydrocarbons and acid gases from a hydrocarbon gas stream |
| CN102008834B (en) * | 2010-10-22 | 2013-12-11 | 王基炳 | Energy regeneration purification device and working principle thereof |
| CN102134503B (en) * | 2011-01-26 | 2013-07-31 | 单民轩 | Clean oil device for recycling natural gas and oil gas |
| CN104266213A (en) * | 2014-09-04 | 2015-01-07 | 程洪亮 | Temperature raising and natural gas saving machine combusting natural gas |
| CN105482863B (en) * | 2015-12-30 | 2019-07-26 | 马中华 | The method that natural gas lyophilization de-hydrocarbon system and natural gas lyophilization take off hydrocarbon |
| CN108559559B (en) * | 2018-02-01 | 2023-12-19 | 成都伊斯顿过滤器有限公司 | Natural gas freeze dehydration device |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1072106A (en) * | 1991-11-05 | 1993-05-19 | 浙江大学 | Dewatering pre-treating method of freezing method for natural gas of oil gas field |
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- 2006-03-31 CN CNB2006100462330A patent/CN100420732C/en not_active Expired - Fee Related
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1072106A (en) * | 1991-11-05 | 1993-05-19 | 浙江大学 | Dewatering pre-treating method of freezing method for natural gas of oil gas field |
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