JP2009167411A - Method of and apparatus for refining natural gas for use in gas engine - Google Patents

Method of and apparatus for refining natural gas for use in gas engine Download PDF

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JP2009167411A
JP2009167411A JP2009001718A JP2009001718A JP2009167411A JP 2009167411 A JP2009167411 A JP 2009167411A JP 2009001718 A JP2009001718 A JP 2009001718A JP 2009001718 A JP2009001718 A JP 2009001718A JP 2009167411 A JP2009167411 A JP 2009167411A
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natural gas
gas mixture
hydrocarbons
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JP5567278B2 (en
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Nikolaus Koenig
ニコラウス・クーニッヒ
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MAN Energy Solutions SE
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MAN Diesel SE
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    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
    • C10L3/00—Gaseous fuels; Natural gas; Synthetic natural gas obtained by processes not covered by subclass C10G, C10K; Liquefied petroleum gas
    • C10L3/06—Natural gas; Synthetic natural gas obtained by processes not covered by C10G, C10K3/02 or C10K3/04
    • C10L3/10—Working-up natural gas or synthetic natural gas
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/22—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by diffusion
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D61/00—Processes of separation using semi-permeable membranes, e.g. dialysis, osmosis or ultrafiltration; Apparatus, accessories or auxiliary operations specially adapted therefor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M21/00—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2256/00—Main component in the product gas stream after treatment
    • B01D2256/24—Hydrocarbons
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2257/00—Components to be removed
    • B01D2257/70—Organic compounds not provided for in groups B01D2257/00 - B01D2257/602
    • B01D2257/702—Hydrocarbons
    • B01D2257/7022—Aliphatic hydrocarbons
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D5/00—Condensation of vapours; Recovering volatile solvents by condensation
    • B01D5/0057—Condensation of vapours; Recovering volatile solvents by condensation in combination with other processes
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working

Abstract

<P>PROBLEM TO BE SOLVED: To improve a method of and an apparatus for refining natural gas for use in a gas engine. <P>SOLUTION: The method of refining natural gas for use in a gas engine is carried out by separating higher carbon-numbered hydrocarbons (14) from an inflow natural gas mixture (10) and increasing the methane value of the remaining natural gas mixture (16) by removing the higher carbon-numbered hydrocarbons (14) therefrom for refining a natural gas used for gas engines. Thereby, the natural gas mixture is enabled to use as gas engine fuel (18). <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

本発明は、ガスエンジンで使用する天然ガスを精製するための方法および装置と、適切に精製された天然ガスと、当該天然ガスの使用と、に関する。   The present invention relates to a method and apparatus for purifying natural gas for use in a gas engine, appropriately purified natural gas, and the use of the natural gas.

ディーゼルガスエンジンやガスオットーエンジンといったガスエンジンは、例えば固定された装置の駆動部として、および天然ガス車両において、ますます重要性を増してきている。ディーゼルガスエンジンの構造と機能性とは、例えば特許文献１および特許文献２に詳細に記載されているので、当該文献の内容が完全に参照される。   Gas engines, such as diesel gas engines and gas otto engines, are becoming increasingly important, for example, as fixed device drives and in natural gas vehicles. Since the structure and functionality of a diesel gas engine are described in detail in, for example, Patent Document 1 and Patent Document 2, the contents of the document are completely referred to.

ガスエンジンの機能性、特にガスエンジンの燃焼プロセスにとっては、使用される天然ガスの性質が決定的な意味を持つ。天然ガスの主な構成成分は、メタン（ＣＨ４）、エタン（Ｃ２Ｈ６）、プロパン（Ｃ３Ｈ８）、ブタン（Ｃ４Ｈ１０）などの炭化水素と、炭酸ガス（ＣＯ２）と、窒素ガス（Ｎ２）と、場合によって硫化水素（Ｈ２Ｓ）と、である。ヨーロッパで使用されている天然ガスのメタン価は、生産地に応じて、通常は７０から９８の間である。一般的に燃焼プロセス中のノッキング傾向は、メタン価が小さくなればなるほど起こりやすくなる。純粋なメタンのメタン価は１００、純粋な水素のメタン価は０である。天然ガス中に存在するプロパンとブタンがアンチノック性を低下させるが、天然ガスを構成する不燃性ガスである窒素および二酸化炭素によってアンチノック性が上昇しうるので、メタン価が１００以上の天然ガス混合物も存在しうる。 For the functionality of a gas engine, in particular the combustion process of the gas engine, the nature of the natural gas used is critical. The main components of natural gas are hydrocarbons such as methane (CH 4 ), ethane (C 2 H 6 ), propane (C 3 H 8 ), butane (C 4 H 10 ), and carbon dioxide (CO 2 ). Nitrogen gas (N 2 ), and optionally hydrogen sulfide (H 2 S). The methane number of natural gas used in Europe is usually between 70 and 98, depending on the production area. In general, the tendency of knocking during the combustion process is more likely to occur as the methane number decreases. Pure methane has a methane number of 100, and pure hydrogen has a methane number of zero. Propane and butane present in natural gas decrease the anti-knock property, but the anti-knock property can be increased by nitrogen and carbon dioxide, which are non-combustible gases constituting natural gas, so that natural gas with a methane number of 100 or more Mixtures can also be present.

メタン価が７０に満たない場合も、ガス燃料は質の悪化が進み、現在のガスエンジンの稼動領域は限られているため、ガス燃料の質を改善し、特にガス燃料のメタン価を増大させる必要がある。   Even when the methane number is less than 70, the quality of the gas fuel is deteriorated and the current operating range of the gas engine is limited, so the quality of the gas fuel is improved, and in particular, the methane number of the gas fuel is increased There is a need.

独国特許発明第１９７５４３５４号明細書German Patent Invention No. 1975354 独国特許出願公開第１０２００５０５０４３５号明細書German Patent Application Publication No. 102005050435

したがって、本発明の課題は、ガスエンジンで使用される天然ガスを精製するための方法と装置とを改善することである。   Accordingly, it is an object of the present invention to improve the method and apparatus for purifying natural gas used in gas engines.

本発明の第一の側面によれば、本課題は請求項１の特徴を有する天然ガス精製方法によって解決される。   According to a first aspect of the present invention, this problem is solved by a natural gas purification method having the features of claim 1.

ガスエンジンで使用される天然ガスの前記精製方法は、すでに存在している天然ガス混合物または流入する天然ガス混合物から、より炭素数の多い炭化水素が分離され、残存した天然ガス混合物が燃料として、ガスエンジンに使用されることを特徴とする。   In the purification method of natural gas used in a gas engine, a hydrocarbon having a higher carbon number is separated from an existing natural gas mixture or an incoming natural gas mixture, and the remaining natural gas mixture is used as a fuel. It is used for a gas engine.

天然ガス混合物からより炭素数の多い炭化水素を分離することによって、残存した天然ガス混合物のメタン価が増大し、アンチノック性が高まるため、燃料の質が向上することになる。この方法によって、有利には、メタン価の小さい天然ガス混合物も、稼動領域の制限された現在のガスエンジンに使用することができる。メタン価は例えば、Ｅ ＤＩＮ ５１６２４：２００７−０１にしたがって算定可能である。   By separating hydrocarbons having a higher carbon number from the natural gas mixture, the methane number of the remaining natural gas mixture is increased and the anti-knock property is increased, so that the quality of the fuel is improved. In this way, advantageously, natural gas mixtures with a low methane number can also be used in current gas engines with limited operating areas. The methane number can be calculated, for example, according to EDIN 51624: 2007-01.

ディーゼルガスエンジンやガスオットーエンジンなどのガスエンジンで使用する天然ガスの当該精製方法は、予燃焼室で点火が行われる場合も行われない場合も、過給が行われる場合も行われない場合も、同様に適している。当該ガスエンジンは、例えば固定された装置や天然ガス車両で使用可能である。   The purification method for natural gas used in gas engines, such as diesel gas engines and gas otto engines, may or may not be ignited or supercharged in the precombustion chamber. Suitable as well. The gas engine can be used in, for example, a fixed device or a natural gas vehicle.

さらに当該方法は基本的に、任意の天然ガス混合物に適用可能であり、メタン価の小さい天然ガス混合物であっても、大きな利点がもたらされる。分離されるべき、より炭素数の多い炭化水素に数えられるのは、特に炭素数２以上の全ての炭化水素、すなわちエタン、プロパン、ブタンなどである。分離方法の実施態様によっては、特に炭素数３以上の全ての炭化水素がより炭素数の多い炭化水素に数えられる。一般的に炭化水素は、炭素数が多くなるにつれ、沸点も高くなる。それゆえ好適には、精製される天然ガスから、より沸点の高い炭化水素が分離され、残存した天然ガス混合物はガスエンジンの燃料として使用される。   Furthermore, the method is basically applicable to any natural gas mixture, and even a natural gas mixture with a low methane number provides great advantages. Among the hydrocarbons with higher carbon numbers to be separated are all hydrocarbons with 2 or more carbon atoms, ie ethane, propane, butane and the like. Depending on the embodiment of the separation method, all hydrocarbons having 3 or more carbon atoms are counted as hydrocarbons having a higher carbon number. Generally, hydrocarbons have a higher boiling point as the number of carbons increases. Therefore, preferably, higher boiling point hydrocarbons are separated from the natural gas to be purified, and the remaining natural gas mixture is used as fuel for the gas engine.

より炭素数の多い炭化水素は、例えば膜分離法および／または加圧凝縮法によって、流入する天然ガス混合物から分離されうるが、本発明は、両分離方法に限定されるものではない。本発明の構成においては、より炭素数の多い炭化水素は数段階のプロセスによって、流入する天然ガス混合物から除去され、それによって分離プロセスの効率が高められる。   Higher carbon number hydrocarbons can be separated from the incoming natural gas mixture, for example, by membrane separation and / or pressure condensation, but the invention is not limited to both separation methods. In the arrangement of the present invention, the higher carbon number hydrocarbons are removed from the incoming natural gas mixture in several steps, thereby increasing the efficiency of the separation process.

本発明の有利な構成では、分離されたより炭素数の多い炭化水素は液化され、ガスエンジンの点火材料として用いられる。より炭素数の多い炭化水素は総じて沸点もより高くなるので、容易に液化可能であり、気体状のメタンなどよりもはるかに点火しやすい。それゆえ、例えば点火装置のグロープラグの温度を下げることが可能となる。   In an advantageous configuration of the invention, the separated higher carbon number hydrocarbons are liquefied and used as a gas engine ignition material. Since hydrocarbons with higher carbon numbers generally have higher boiling points, they can be easily liquefied and are much easier to ignite than gaseous methane. Therefore, for example, the temperature of the glow plug of the ignition device can be lowered.

本発明の第二の側面によれば、上記の課題は請求項５の特徴を有する天然ガス精製装置によって解決される。   According to a second aspect of the present invention, the above problem is solved by a natural gas purifier having the features of claim 5.

本発明に係るガスエンジンで使用される天然ガスの精製装置は、流入する天然ガス混合物から、より炭素数の多い炭化水素を分離するための分離装置と、残存した天然ガス混合物をガスエンジンの燃料として収容するための装置と、を備える。   The purification apparatus for natural gas used in the gas engine according to the present invention includes a separation apparatus for separating hydrocarbons having a higher carbon number from an inflowing natural gas mixture, and the remaining natural gas mixture as a fuel for the gas engine. And a device for housing as a device.

当該装置によって、上記の方法と同じ利点が得られるため、再度の説明は省略する。   Since the same advantage as the above method can be obtained by the apparatus, the description thereof will be omitted.

例えば当該分離装置は、流入する天然ガス混合物からより炭素数の多い炭化水素を分離するために、膜分離法および／または加圧凝縮法によって形成される。   For example, the separation device is formed by a membrane separation method and / or a pressure condensation method in order to separate higher carbon number hydrocarbons from the incoming natural gas mixture.

好適には当該装置はさらに、分離されたより炭素数の多い炭化水素を液化する装置を備え、特に好適には液化されたより炭素数の多い炭化水素をガスエンジンの点火材料として収容する装置を備える。   Preferably, the apparatus further comprises an apparatus for liquefying the separated higher carbon number hydrocarbon, and particularly preferably an apparatus for receiving the liquefied higher carbon number hydrocarbon as the ignition material of the gas engine.

本発明に係るガスエンジンで使用される天然ガスの精製プロセスを部分的に概略化した図である。It is the figure which partially outlined the refinement | purification process of the natural gas used with the gas engine which concerns on this invention.

本発明の上記の課題およびさらなる課題と、特徴と、利点とは、以下の好適な実施例に関する詳細な説明から、より明らかとなる。唯一の図として、プロセスの進行を示したフローチャートを用いて、本発明を説明する。   The above and further problems, features and advantages of the present invention will become more apparent from the detailed description of the preferred embodiments below. The present invention will be described using a flowchart showing the progress of the process as the only figure.

図１は本発明に係るガスエンジンで使用される天然ガスの精製プロセスを部分的に概略化したものである。もちろん天然ガス混合物の精製は、図示されたプロセスの前および／または後に、ガスエンジンの燃料として天然ガス混合物を精製するのに必要であり、かつ先行技術から当業者に知られているさらなるプロセスおよび装置（フィルタ、センサなど）を含むことができる。   FIG. 1 is a partially schematic representation of a purification process for natural gas used in a gas engine according to the present invention. Of course, the purification of the natural gas mixture is necessary to purify the natural gas mixture as a fuel for the gas engine, before and / or after the illustrated process, and further processes known from the prior art to those skilled in the art and Devices (filters, sensors, etc.) can be included.

流入する天然ガス混合物１０は、通常、構成成分としてメタン（ＣＨ４）とエタン（Ｃ２Ｈ６）とプロパン（Ｃ３Ｈ８）とブタン（Ｃ４Ｈ１０）と、ならびに二酸化炭素（ＣＯ２）と、窒素（Ｎ２）と、場合によって硫化水素（Ｈ２Ｓ）と、を含む。ヨーロッパでは、流入する天然ガス混合物１０の典型的なメタン価は７０から９８の間であるが、７０を下回る天然ガス混合物も増加してきている。流入する天然ガス混合物１０は、より炭素数の多い炭化水素１４、すなわち炭素数２以上の炭化水素であるエタン、プロパン、ブタンなどを分離するために、分離装置１２に運ばれる。あるいは炭素数３以上の、より炭素数の多い炭化水素１４のみを分離することもできる。 The incoming natural gas mixture 10 is typically composed of methane (CH 4 ), ethane (C 2 H 6 ), propane (C 3 H 8 ), butane (C 4 H 10 ) and carbon dioxide (CO 2 ) as constituents. ), Nitrogen (N 2 ), and optionally hydrogen sulfide (H 2 S). In Europe, the typical methane number of the incoming natural gas mixture 10 is between 70 and 98, but natural gas mixtures below 70 are also increasing. The incoming natural gas mixture 10 is conveyed to a separator 12 to separate hydrocarbons 14 with higher carbon numbers, ie, ethane, propane, butane, etc., which are hydrocarbons with 2 or more carbon atoms. Alternatively, it is possible to separate only hydrocarbons 14 having 3 or more carbon atoms and having a larger number of carbon atoms.

より炭素数の多い炭化水素１４の分離は、例えば膜分離法または加圧凝縮法によって行われる。当該分離プロセスの効率を高めるために、より炭素数の多い炭化水素１４は、好適には流入する天然ガス混合物１０から数段階のプロセスを経て分離される。   Separation of the hydrocarbon 14 having a higher carbon number is performed by, for example, a membrane separation method or a pressure condensation method. In order to increase the efficiency of the separation process, the higher carbon number hydrocarbons 14 are preferably separated from the incoming natural gas mixture 10 in several stages.

分離後に残存した天然ガス混合物１６は、主要構成成分としてメタンを有し、したがって、流入する天然ガス混合物１０よりもメタン価が大きくなる。残存した天然ガス混合物１６はメタン価が大きくなるため、アンチノック性が高まり、それによってガスエンジンの燃料１８としての質的改善と出力増大がもたらされる。したがって、本発明に係る方法は、特にメタン価の小さい、例えば７０未満の、流入する天然ガス混合物１０の精製に有利なものであるが、基本的にはメタン価のより大きい天然ガス混合物１０にも適用可能である。   The natural gas mixture 16 remaining after the separation has methane as a main constituent, and therefore has a higher methane number than the incoming natural gas mixture 10. Since the remaining natural gas mixture 16 has a high methane number, the anti-knock property is enhanced, which leads to a quality improvement and an increase in output as the fuel 18 of the gas engine. Thus, the method according to the invention is particularly advantageous for the purification of an incoming natural gas mixture 10 with a low methane number, for example less than 70, but basically a natural gas mixture 10 with a higher methane number is used. Is also applicable.

本発明の特に好適な実施態様では、分離された、より炭素数の多い炭化水素１４は、当該炭化水素を液化するためのさらなる装置２０に運ばれる。液化が行われた後、より炭素数の多い炭化水素１４は、点火材料２２として、ガスエンジンで使用される。液化された、より炭素数の多い炭化水素は、ガスエンジンにおいて、既存または改良された噴射技術によって使用されうる。   In a particularly preferred embodiment of the invention, the separated, higher carbon number hydrocarbons 14 are conveyed to a further apparatus 20 for liquefying the hydrocarbons. After liquefaction has taken place, the higher carbon number hydrocarbons 14 are used as ignition material 22 in gas engines. Liquefied, higher carbon number hydrocarbons can be used in gas engines by existing or improved injection techniques.

メタンより炭素数の多い炭化水素は、沸点もより高くなる（メタン：−１６２℃、エタン：−８８．６℃、プロパン：−４２℃、ブタン：−０．５℃）。それゆえ、より炭素数の多い炭化水素は容易に分離され、分離されたより炭素数の多い炭化水素１４は容易かつ少量のエネルギーで液化され、液状の点火材料２２としてガスエンジンで使用される。当該液状点火材料２２は、気体状のメタンなどよりもはるかに点火しやすいため、ガスエンジンにおける点火装置のグロープラグの温度と、ガスエンジンにおける高圧圧縮のためのエネルギー消費とを低下させることが可能となる。天然ガス混合物の分析結果によると、メタン価の小さい低級の天然ガス混合物には、点火材料として利用可能な液化ガスが２〜４％含まれている。   A hydrocarbon having more carbon atoms than methane has a higher boiling point (methane: -162 ° C, ethane: -88.6 ° C, propane: -42 ° C, butane: -0.5 ° C). Therefore, the higher carbon number hydrocarbons are easily separated, and the separated higher carbon number hydrocarbons 14 are easily and liquefied with a small amount of energy and used as a liquid ignition material 22 in a gas engine. Since the liquid ignition material 22 is much easier to ignite than gaseous methane or the like, the temperature of the glow plug of the ignition device in the gas engine and the energy consumption for high-pressure compression in the gas engine can be reduced. It becomes. According to the analysis result of the natural gas mixture, the lower natural gas mixture having a small methane number contains 2 to 4% of liquefied gas that can be used as an ignition material.

上記の方法で製造された点火材料２２と燃料１８とは、まずそれぞれの物質の収容に適した装置（貯蔵タンクなど）に集められた後、ガスエンジンに供給される。   The ignition material 22 and the fuel 18 manufactured by the above method are first collected in a device (such as a storage tank) suitable for containing each substance, and then supplied to the gas engine.

したがって、本発明に係る方法および装置は、質的に改善された燃料（メタン価が増大し、ノッキング傾向が減少し、出力が増大した）だけではなく、質的に改善された点火材料（点火がより容易になり、より少ないエネルギーで高圧圧縮が可能となった）をも提供する。   Thus, the method and apparatus according to the present invention provides not only a qualitatively improved fuel (increased methane number, reduced knocking tendency, increased output), but also a qualitatively improved ignition material (ignition). Has become easier and high pressure compression is possible with less energy).

１０ 天然ガス混合物
１２ 分離装置
１４ 炭素数の多い炭化水素
１６ 残存した天然ガス混合物
１８ ガスエンジンの燃料
２０ 液化装置
２２ 点火材料 DESCRIPTION OF SYMBOLS 10 Natural gas mixture 12 Separation device 14 Hydrocarbon with many carbon atoms 16 Remaining natural gas mixture 18 Gas engine fuel 20 Liquefaction device 22 Ignition material

Claims (13)

ガスエンジンで使用される天然ガスを精製するための方法において、天然ガス混合物（１０）から、より炭素数の多い炭化水素（１４）が少なくとも部分的に分離され、残存した天然ガス混合物（１６）は燃料（１８）としてガスエンジンで使用されることを特徴とする方法。   In a method for purifying natural gas for use in a gas engine, hydrocarbons (14) having a higher carbon number are at least partially separated from the natural gas mixture (10) and the remaining natural gas mixture (16). Used in a gas engine as fuel (18). より炭素数の多い炭化水素（１４）が、流入する天然ガス混合物（１０）から、少なくとも部分的に膜分離法（１２）によって分離されることを特徴とする請求項１に記載の方法。   The process according to claim 1, characterized in that the higher carbon number hydrocarbons (14) are at least partly separated from the incoming natural gas mixture (10) by a membrane separation method (12). より炭素数の多い炭化水素（１４）が、前記流入する天然ガス混合物（１０）から、少なくとも部分的に加圧凝縮法（１２）によって分離されることを特徴とする請求項１または請求項２に記載の方法。   3. The higher carbon number hydrocarbon (14) is separated from the incoming natural gas mixture (10) at least partly by a pressure condensation process (12). The method described in 1. より炭素数の多い炭化水素（１４）が、前記流入する天然ガス混合物（１０）から、数段階のプロセスを経て除去されることを特徴とする請求項１から請求項３のいずれか一項に記載の方法。   4. The hydrocarbon (14) having a higher carbon number is removed from the incoming natural gas mixture (10) via a several-stage process. The method described. 前記分離された、より炭素数の多い炭化水素（１４）が液化（２０）され、点火材料（２２）としてガスエンジンで使用されることを特徴とする請求項１から請求項４のいずれか一項に記載の方法。   5. The separated higher carbon number hydrocarbon (14) is liquefied (20) and used in a gas engine as an ignition material (22). The method according to item. 精製されるべき天然ガス混合物のメタン価が、特にＥ ＤＩＮ ５１６２４に基づき最大で９０であり、特に最大で８０であり、好適には最大で７０であることを特徴とする請求項１から請求項５のいずれか一項に記載の方法。   The methane number of the natural gas mixture to be purified, in particular based on EDIN 51624, is at most 90, in particular at most 80, preferably at most 70. 6. The method according to any one of 5 above. 前記精製されるべき天然ガス混合物から、沸点のより高い炭化水素、特にプロパン、ブタンおよび／またはペンタンが分離されることを特徴とする請求項１から請求項６のいずれか一項に記載の方法。   7. Process according to any one of claims 1 to 6, characterized in that higher boiling hydrocarbons, in particular propane, butane and / or pentane, are separated from the natural gas mixture to be purified. . ガスエンジンで使用される天然ガスを精製するための装置において、天然ガス混合物（１０）からより炭素数の多い炭化水素（１４）を分離するための分離装置（１２）と、残存した天然ガス混合物（１６）をガスエンジンの燃料（１８）として収容するための装置とを特徴とし、請求項１から請求項７のいずれか一項に記載の方法を実施するために形成された装置。   Separation device (12) for separating higher carbon number hydrocarbons (14) from natural gas mixture (10) in a device for purifying natural gas used in a gas engine, and remaining natural gas mixture 8. An apparatus for receiving (16) as fuel (18) for a gas engine, and an apparatus formed for carrying out the method according to any one of claims 1 to 7. 流入する天然ガス混合物（１０）から、より炭素数の多い炭化水素（１４）を分離するための前記分離装置（１２）が、膜分離法（１２）によって形成されていることを特徴とする請求項８に記載の装置。   The separation device (12) for separating hydrocarbons (14) with a higher carbon number from the incoming natural gas mixture (10) is formed by a membrane separation method (12). Item 9. The apparatus according to Item 8. 流入する天然ガス混合物（１０）から、より炭素数の多い炭化水素（１４）を分離するための前記分離装置（１２）が、加圧凝縮法（１２）によって形成されていることを特徴とする請求項８または請求項９に記載の装置。   The separation device (12) for separating hydrocarbons (14) having a higher carbon number from the inflowing natural gas mixture (10) is formed by a pressure condensation method (12). 10. An apparatus according to claim 8 or claim 9. 前記装置がさらに、前記分離された、より炭素数の多い炭化水素（１４）を液化するための装置（２０）と、前記液化された、より炭素数の多い炭化水素をガスエンジンの点火材料（２０）として収容するための装置とを有することを特徴とする請求項８から請求項１０のいずれか一項に記載の装置。   The apparatus further includes an apparatus (20) for liquefying the separated higher carbon number hydrocarbons (14), and the liquefied higher carbon number hydrocarbons for igniting a gas engine ( The device according to any one of claims 8 to 10, characterized in that it comprises a device for receiving as 20). 請求項１から請求項７のいずれか一項に記載の方法によって精製されたことを特徴とする、ガスエンジンで使用するための天然ガス。   Natural gas for use in a gas engine, characterized by being purified by the method according to any one of claims 1 to 7. 請求項１から請求項７のいずれか一項に記載の方法によって精製された天然ガスの、ガスエンジンの燃料としての使用。   Use of natural gas purified by the method according to any one of claims 1 to 7 as fuel for a gas engine.
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