JP2014189641A - Fuel oil composition for homogeneous charge compression ignition engine - Google Patents
Fuel oil composition for homogeneous charge compression ignition engine Download PDFInfo
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- JP2014189641A JP2014189641A JP2013066382A JP2013066382A JP2014189641A JP 2014189641 A JP2014189641 A JP 2014189641A JP 2013066382 A JP2013066382 A JP 2013066382A JP 2013066382 A JP2013066382 A JP 2013066382A JP 2014189641 A JP2014189641 A JP 2014189641A
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- 238000007906 compression Methods 0.000 title claims abstract description 68
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- 239000000295 fuel oil Substances 0.000 title claims abstract description 64
- 150000001875 compounds Chemical class 0.000 claims abstract description 56
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 48
- 239000001301 oxygen Substances 0.000 claims abstract description 48
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 48
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims abstract description 42
- 239000000446 fuel Substances 0.000 claims abstract description 34
- CIWBSHSKHKDKBQ-JLAZNSOCSA-N Ascorbic acid Chemical compound OC[C@H](O)[C@H]1OC(=O)C(O)=C1O CIWBSHSKHKDKBQ-JLAZNSOCSA-N 0.000 claims abstract description 11
- 238000009835 boiling Methods 0.000 claims abstract description 5
- 238000004821 distillation Methods 0.000 claims description 11
- 125000004432 carbon atom Chemical group C* 0.000 claims description 5
- 239000000779 smoke Substances 0.000 abstract description 23
- 238000002347 injection Methods 0.000 abstract description 16
- 239000007924 injection Substances 0.000 abstract description 16
- 239000000243 solution Substances 0.000 abstract 1
- 238000002485 combustion reaction Methods 0.000 description 31
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 21
- 239000002585 base Substances 0.000 description 13
- 239000000463 material Substances 0.000 description 13
- 239000007789 gas Substances 0.000 description 11
- DKGAVHZHDRPRBM-UHFFFAOYSA-N Tert-Butanol Chemical compound CC(C)(C)O DKGAVHZHDRPRBM-UHFFFAOYSA-N 0.000 description 9
- 239000003208 petroleum Substances 0.000 description 9
- 238000010998 test method Methods 0.000 description 9
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 8
- 238000012360 testing method Methods 0.000 description 8
- 150000001336 alkenes Chemical class 0.000 description 6
- 239000010779 crude oil Substances 0.000 description 6
- 239000003502 gasoline Substances 0.000 description 6
- JRZJOMJEPLMPRA-UHFFFAOYSA-N olefin Natural products CCCCCCCC=C JRZJOMJEPLMPRA-UHFFFAOYSA-N 0.000 description 6
- LRHPLDYGYMQRHN-UHFFFAOYSA-N N-Butanol Chemical compound CCCCO LRHPLDYGYMQRHN-UHFFFAOYSA-N 0.000 description 5
- 239000000654 additive Substances 0.000 description 5
- 125000003118 aryl group Chemical group 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 238000002156 mixing Methods 0.000 description 5
- 230000015572 biosynthetic process Effects 0.000 description 4
- 239000001569 carbon dioxide Substances 0.000 description 4
- 229910002092 carbon dioxide Inorganic materials 0.000 description 4
- 239000003350 kerosene Substances 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 229910052717 sulfur Inorganic materials 0.000 description 4
- 239000011593 sulfur Substances 0.000 description 4
- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 3
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 3
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 3
- BTANRVKWQNVYAZ-UHFFFAOYSA-N butan-2-ol Chemical compound CCC(C)O BTANRVKWQNVYAZ-UHFFFAOYSA-N 0.000 description 3
- 238000004364 calculation method Methods 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 3
- SBZXBUIDTXKZTM-UHFFFAOYSA-N diglyme Chemical compound COCCOCCOC SBZXBUIDTXKZTM-UHFFFAOYSA-N 0.000 description 3
- 239000003921 oil Substances 0.000 description 3
- 238000002360 preparation method Methods 0.000 description 3
- 231100000241 scar Toxicity 0.000 description 3
- NUMQCACRALPSHD-UHFFFAOYSA-N tert-butyl ethyl ether Chemical compound CCOC(C)(C)C NUMQCACRALPSHD-UHFFFAOYSA-N 0.000 description 3
- LCGLNKUTAGEVQW-UHFFFAOYSA-N Dimethyl ether Chemical compound COC LCGLNKUTAGEVQW-UHFFFAOYSA-N 0.000 description 2
- KFZMGEQAYNKOFK-UHFFFAOYSA-N Isopropanol Chemical compound CC(C)O KFZMGEQAYNKOFK-UHFFFAOYSA-N 0.000 description 2
- BZLVMXJERCGZMT-UHFFFAOYSA-N Methyl tert-butyl ether Chemical compound COC(C)(C)C BZLVMXJERCGZMT-UHFFFAOYSA-N 0.000 description 2
- -1 alkaline earth metal salts Chemical class 0.000 description 2
- 239000012298 atmosphere Substances 0.000 description 2
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- 230000020169 heat generation Effects 0.000 description 2
- 229930195733 hydrocarbon Natural products 0.000 description 2
- 150000002430 hydrocarbons Chemical class 0.000 description 2
- NNPPMTNAJDCUHE-UHFFFAOYSA-N isobutane Chemical compound CC(C)C NNPPMTNAJDCUHE-UHFFFAOYSA-N 0.000 description 2
- ZXEKIIBDNHEJCQ-UHFFFAOYSA-N isobutanol Chemical compound CC(C)CO ZXEKIIBDNHEJCQ-UHFFFAOYSA-N 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 239000002904 solvent Substances 0.000 description 2
- 239000002028 Biomass Substances 0.000 description 1
- XOBKSJJDNFUZPF-UHFFFAOYSA-N Methoxyethane Chemical compound CCOC XOBKSJJDNFUZPF-UHFFFAOYSA-N 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 150000001298 alcohols Chemical class 0.000 description 1
- 229910052783 alkali metal Inorganic materials 0.000 description 1
- 150000001340 alkali metals Chemical class 0.000 description 1
- 229910052784 alkaline earth metal Inorganic materials 0.000 description 1
- 239000003945 anionic surfactant Substances 0.000 description 1
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- 239000000987 azo dye Substances 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 238000004523 catalytic cracking Methods 0.000 description 1
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- 238000006073 displacement reaction Methods 0.000 description 1
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- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 239000001282 iso-butane Substances 0.000 description 1
- 229940035429 isobutyl alcohol Drugs 0.000 description 1
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- BDERNNFJNOPAEC-UHFFFAOYSA-N propan-1-ol Chemical compound CCCO BDERNNFJNOPAEC-UHFFFAOYSA-N 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000002407 reforming Methods 0.000 description 1
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- 238000003860 storage Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- KZNICNPSHKQLFF-UHFFFAOYSA-N succinimide Chemical class O=C1CCC(=O)N1 KZNICNPSHKQLFF-UHFFFAOYSA-N 0.000 description 1
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- Liquid Carbonaceous Fuels (AREA)
Abstract
Description
本発明は、自動車エンジン用などの燃料油組成物に関し、更に詳しくは、スモーク排出量を低減できる予混合圧縮自己着火燃焼を達成することが出来る燃料油組成物に関する。 The present invention relates to a fuel oil composition for automobile engines and the like, and more particularly to a fuel oil composition capable of achieving premixed compression self-ignition combustion capable of reducing smoke emission.
近年、環境問題から自動車から排出される排気ガスの低減やエンジンの熱効率の向上が求められている。ディーゼルエンジンは、ガソリンエンジンに比べ熱効率が高く、地球温暖化に関係があるといわれている二酸化炭素（ＣＯ２）の排出量が低い特性を有する。しかしながら、通常の拡散燃焼によるディーゼルエンジンでは、部分的に燃料の濃度が濃過ぎる、高温燃焼の領域が形成されるなどの理由により、スモークや酸化窒素（ＮＯｘ）の排出量が多い。 In recent years, reduction of exhaust gas discharged from automobiles and improvement of engine thermal efficiency have been demanded due to environmental problems. Diesel engines have higher thermal efficiency than gasoline engines, and have low carbon dioxide (CO 2 ) emissions, which are said to be related to global warming. However, in a diesel engine based on normal diffusion combustion, smoke and nitrogen oxide (NOx) emissions are large due to the fact that the fuel concentration is partly too high and a high temperature combustion region is formed.
これを解決するための技術として、予混合圧縮自己着火エンジンが注目されている（例えば、非特許文献１）。このような予混合圧縮自己着火エンジンで行われる予混合圧縮自己着火燃焼は、燃料と空気が希薄予混合された状態で圧縮されることにより、燃料が自己着火し燃焼する現象であり、ディーゼルエンジンにおいても、燃料を早期にかつ最適なタイミングで噴射することによって希薄予混合気を形成し、それを圧縮着火させることにより、排気ガス中のＮＯｘやスモークを同時に低減することが可能である。 As a technique for solving this problem, a premixed compression self-ignition engine has attracted attention (for example, Non-Patent Document 1). The premixed compression self-ignition combustion performed in such a premixed compression self-ignition engine is a phenomenon in which fuel is self-ignited and burned when the fuel and air are compressed in a lean premixed state. However, it is possible to simultaneously reduce NOx and smoke in the exhaust gas by forming a lean premixed gas by injecting the fuel at an early timing and at an optimal timing, and compressing and igniting it.
しかしながら、特に高負荷条件において予混合圧縮着火燃焼を応用すると、混合気形成の悪化や急速な燃焼形態により排気ガスが増加するだけでなく燃焼騒音の増大も発生する場合があり、予混合圧縮自己着火燃焼は比較的負荷の低い領域に限られている。 However, when premixed compression ignition combustion is applied particularly under high load conditions, not only the exhaust gas but also the combustion noise may increase due to the deterioration of the mixture formation and the rapid combustion mode. Ignition combustion is limited to areas with relatively low loads.
従って、高負荷領域での運転は、燃料噴射時期を変化させることにより、通常の拡散燃焼を行う運転が必要となるため、予混合圧縮自己着火エンジンにおいても、一般的なディーゼルエンジンの燃料噴射ノズル（ホールノズル）や燃焼室形状が求められる。 Therefore, since the operation in the high load region requires the operation of performing normal diffusion combustion by changing the fuel injection timing, even in the premixed compression self-ignition engine, the fuel injection nozzle of a general diesel engine (Hole nozzle) and combustion chamber shape are required.
ホールノズルを用いた通常のディーゼルエンジンにおいて、一般的な軽油を用いて早期噴射による予混合圧縮自己着火燃焼により運転を行った場合、従来の一般的な軽油を用いたディーゼル燃焼による運転の場合に比べれば、ＮＯｘやスモークの発生が抑制されて、排気ガス中のＮＯｘやスモークが少なくなるものの、ＮＯｘやスモークの発生の抑制が満足できるものではない。また、燃料の噴射時期が若干変化するとスモークの増加を招くなど、十分に優れた特性を示す予混合圧縮自己着火燃焼を達成することは困難であった（例えば、非特許文献１参照）。 In a normal diesel engine using a hole nozzle, when operating by premixed compression self-ignition combustion by early injection using general light oil, when operating by diesel combustion using conventional general light oil In comparison, generation of NOx and smoke is suppressed and NOx and smoke in the exhaust gas are reduced, but suppression of generation of NOx and smoke is not satisfactory. In addition, it has been difficult to achieve premixed compression self-ignition combustion exhibiting sufficiently excellent characteristics, such as a slight increase in the fuel injection timing, resulting in an increase in smoke (see, for example, Non-Patent Document 1).
予混合圧縮自己着火燃焼では、燃料がエンジンシリンダー内に噴射された後、空気と予混合され、燃料の酸化反応が逐次的に進行し着火・燃焼という過程を経るので、燃料と空気の予混合気の形成と着火時期が重要なポイントであって、燃料自体の物理特性や化学特性が大きく影響するため、燃料の性状によっては、上記の課題を解決し、通常のホールノズルや燃焼室形状のディーゼルエンジンにおいても予混合圧縮自己着火燃焼を達成できる可能性があり、例えば、特許文献１では、燃料組成物の蒸留性状やセタン価を制御することにより排気ガスの少ない予混合圧縮自己着火燃焼が可能になる事が示されている。 In premixed compression self-ignition combustion, fuel is injected into the engine cylinder and then premixed with air. The fuel oxidation reaction proceeds sequentially and undergoes a process of ignition and combustion. The formation and ignition timing are important points, and the physical and chemical characteristics of the fuel itself have a large effect. Depending on the properties of the fuel, the above problems can be solved and the shape of the normal hole nozzle or combustion chamber There is a possibility that premixed compression autoignition combustion can be achieved even in a diesel engine. For example, in Patent Document 1, premixed compression autoignition combustion with less exhaust gas is performed by controlling the distillation property and cetane number of the fuel composition. It is shown that it will be possible.
一方、環境保全の観点から、二酸化炭素排出量抑制のために、エタノールなどのバイオマス由来の含酸素基材の導入も検討されている。これらの含酸素基材を燃料に用いた場合、大気中から二酸化炭素を吸収してできた植物を原料としていることから、燃焼させても、大気中への二酸化炭素排出は少ないとみなされている。例えば、特許文献２では燃料組成物に含酸素化合物を配合することにより通常のディーゼル燃焼でスモークが低減することが知られており、燃料中の含酸素量でスモーク低減効果が整理されることが示されている。 On the other hand, from the viewpoint of environmental protection, introduction of biomass-derived oxygen-containing base materials such as ethanol is also being studied in order to suppress carbon dioxide emissions. When these oxygen-containing base materials are used as fuel, the plant is made by absorbing carbon dioxide from the atmosphere, so even if it is burned, carbon dioxide emissions into the atmosphere are considered to be low. Yes. For example, in Patent Document 2, it is known that smoke is reduced by normal diesel combustion by adding an oxygen-containing compound to the fuel composition, and the smoke reduction effect is arranged by the oxygen content in the fuel. It is shown.
しかしながら、含酸素基材を配合した燃料を予混合圧縮自己着火燃焼に適用した例は少なく、スモーク排出量へ与える影響は不明である。 However, there are few examples where the fuel containing the oxygen-containing base material is applied to the premixed compression self-ignition combustion, and the influence on the smoke emission amount is unknown.
従って、本発明の目的は、含酸素化合物が配合されている燃料油組成物であって、様々な燃料噴射時期においても十分にスモーク排出量を低減することができる予混合圧縮自己着火エンジン用燃料油組成物を提供することにある。 Accordingly, an object of the present invention is a fuel oil composition containing an oxygen-containing compound, and a fuel for a premixed compression self-ignition engine that can sufficiently reduce smoke emission even at various fuel injection timings. It is to provide an oil composition.
本発明は上記目的を達成するために、以下に示す予混合圧縮自己着火エンジン用燃料油組成物を提供するものである。
すなわち、本発明は、含酸素化合物を含有する予混合圧縮自己着火エンジン用燃料油組成物であって、
燃料のセタン価が３５〜４５の範囲にあり、初留点が２０℃以上１３０℃以下、５０容量％留出点が６０℃以上１８０℃以下、終点が２００℃以上３００℃以下であり、３０℃における動粘度が０．６ｍｍ２／ｓ以上０．８２ｍｍ２／ｓ以下であり、２５℃における表面張力が２０．０ｍＮ／ｍ以上２３．５ｍＮ／ｍ以下であり、
該含酸素化合物がアルコール又はモノエーテルであり、該含酸素化合物の含有量が２〜１５容量％であること、
を特徴とする予混合圧縮自己着火エンジン用燃料油組成物を提供するものである。
In order to achieve the above object, the present invention provides the following fuel oil composition for a premixed compression self-ignition engine.
That is, the present invention is a fuel oil composition for a premixed compression self-ignition engine containing an oxygen-containing compound,
The cetane number of the fuel is in the range of 35 to 45, the initial boiling point is 20 ° C. or higher and 130 ° C. or lower, the 50% by volume distillation point is 60 ° C. or higher and 180 ° C. or lower, and the end point is 200 ° C. or higher and 300 ° C. or lower. ° C. kinematic viscosity of 0.6 mm 2 / s or more at 0.82mm and at 2 / s or less, a surface tension at 25 ° C. or less 20.0mN / m or more 23.5mN / m,
The oxygen-containing compound is alcohol or monoether, and the content of the oxygen-containing compound is 2 to 15% by volume;
A fuel oil composition for a premixed compression self-ignition engine is provided.
本発明によれば、含酸素化合物が配合されている燃料油組成物であって、様々な燃料噴射時期においても十分にスモーク排出量を低減することができる予混合圧縮自己着火エンジン用燃料油組成物を提供することができる。このような本発明の燃料油組成物の上記優れた作用効果は、本発明に規定する燃料油組成物の諸性状に関する要件と、調製に用いる調合基材に関する要件とが相俟って達せられるものと考えられ、これらの要件のいずれが欠けても本発明の燃料油組成物の上記優れた作用効果は達せられない。 According to the present invention, a fuel oil composition containing an oxygen-containing compound, and a fuel oil composition for a premixed compression self-ignition engine that can sufficiently reduce smoke emission even at various fuel injection timings. Things can be provided. The above-described excellent operational effects of the fuel oil composition of the present invention can be achieved by combining the requirements regarding the properties of the fuel oil composition defined in the present invention and the requirements regarding the preparation base material used for the preparation. Therefore, even if any of these requirements is lacking, the above-described excellent effect of the fuel oil composition of the present invention cannot be achieved.
本発明の予混合圧縮自己着火エンジン用燃料油組成物は、含酸素化合物を含有する予混合圧縮自己着火エンジン用燃料油組成物であって、
燃料のセタン価が３５〜４５の範囲にあり、初留点が２０℃以上１３０℃以下、５０容量％留出点が６０℃以上１８０℃以下、終点が２００℃以上３００℃以下であり、３０℃における動粘度が０．６ｍｍ２／ｓ以上０．８２ｍｍ２／ｓ以下であり、２５℃における表面張力が２０．０ｍＮ／ｍ以上２３．５ｍＮ／ｍ以下であり、
該含酸素化合物がアルコール又はモノエーテルであり、該含酸素化合物の含有量が２〜１５容量％であること、
を特徴とする予混合圧縮自己着火エンジン用燃料油組成物である。
The fuel oil composition for a premixed compression self-ignition engine of the present invention is a fuel oil composition for a premixed compression self-ignition engine containing an oxygen-containing compound,
The cetane number of the fuel is in the range of 35 to 45, the initial boiling point is 20 ° C. or higher and 130 ° C. or lower, the 50% by volume distillation point is 60 ° C. or higher and 180 ° C. or lower, and the end point is 200 ° C. or higher and 300 ° C. or lower. ° C. kinematic viscosity of 0.6 mm 2 / s or more at 0.82mm and at 2 / s or less, a surface tension at 25 ° C. or less 20.0mN / m or more 23.5mN / m,
The oxygen-containing compound is alcohol or monoether, and the content of the oxygen-containing compound is 2 to 15% by volume;
Is a fuel oil composition for a premixed compression self-ignition engine.
本発明における予混合圧縮自己着火エンジン用燃料油組成物の３０℃における動粘度は、０．６ｍｍ２／ｓ以上０．８２ｍｍ２／ｓ以下、好ましくは０．６１５ｍｍ２／ｓ以上０．８２ｍｍ２／ｓ以下、さらに好ましくは０．６２ｍｍ２／ｓ以上０．８２ｍｍ２／ｓ以下である。３０℃における動粘度が上記範囲内にあることにより、適切な燃料噴霧が達成され、燃料空気予混合気の形成が容易になり、ＨＣやＣＯなどの不完全燃焼生成物を抑制することが出来る。なお、動粘度はＪＩＳ Ｋ ２２８３「原油及び石油製品−動粘度試験方法及び粘度指数算出方法」に準じて測定した値を意味する。 Kinematic viscosity at 30 ° C. of the premixed compression ignition engine fuel oil composition of the present invention, 0.6 mm 2 / s or more 0.82 mm 2 / s or less, preferably 0.615mm 2 / s or more 0.82 mm 2 / s, more preferably not more than 0.62 mm 2 / s or more 0.82 mm 2 / s. When the kinematic viscosity at 30 ° C. is within the above range, an appropriate fuel spray is achieved, the formation of a fuel-air premixture is facilitated, and incomplete combustion products such as HC and CO can be suppressed. . The kinematic viscosity means a value measured according to JIS K 2283 “Crude oil and petroleum products—Kinematic viscosity test method and viscosity index calculation method”.
本発明における予混合圧縮自己着火エンジン用燃料油組成物の２５℃における表面張力は、２０ｍＮ／ｍ以上２３．５ｍＮｍ以下、好ましくは２０．５ｍＮ／ｍ以上２３ｍＮ／ｍ以下、さらに好ましくは２１ｍＮ／ｍ以上２２．５ｍＮ／ｍ以下である。２５℃における表面張力が上記範囲内であることにより、適切な燃料噴霧が達成され、燃料空気予混合気の生成が容易になり、ＨＣやＣＯなどの不完全燃焼生成物を抑制することが出来る。なお、表面張力は、ＪＩＳ Ｋ ２２４１「切削油剤−表面張力試験方法」に準じて測定した値を意味する。 The surface tension at 25 ° C. of the premixed compression self-ignition engine fuel oil composition in the present invention is 20 mN / m or more and 23.5 mNm or less, preferably 20.5 mN / m or more and 23 mN / m or less, more preferably 21 mN / m. It is 22.5 mN / m or less. When the surface tension at 25 ° C. is within the above range, appropriate fuel spraying can be achieved, fuel-air premixed gas can be easily generated, and incomplete combustion products such as HC and CO can be suppressed. . The surface tension means a value measured according to JIS K 2241 “Cutting Fluid—Surface Tension Test Method”.
本発明の予混合圧縮自己着火エンジン用燃料油組成物の初留点（ＩＢＰ）は、２０〜１３０℃、好ましくは３０〜１２０℃、さらに好ましくは４０〜１１０℃である。
本発明の予混合圧縮自己着火エンジン用燃料油組成物の１０容量％留出温度（Ｔ１０）は、４０〜１５０℃、好ましくは５０〜１４０℃、さらに好ましくは６０〜１３０℃である。
本発明の予混合圧縮自己着火エンジン用燃料油組成物の５０容量％留出温度（Ｔ５０）は、６０〜１８０℃、好ましくは７０〜１７０℃、さらに好ましくは８０〜１６０℃である。
本発明の予混合圧縮自己着火エンジン用燃料油組成物の９０容量％留出温度（Ｔ９０）は、１６０〜２５０℃、好ましくは１７０〜２４０℃、さらに好ましくは１８０〜２３０℃である。
本発明の予混合圧縮自己着火エンジン用燃料油組成物の終点（ＥＰ）は、２００〜３００℃、好ましくは２１０〜２９０℃、さらに好ましくは２２０〜２８０℃である。
The initial boiling point (IBP) of the fuel oil composition for a premixed compression self-ignition engine of the present invention is 20 to 130 ° C, preferably 30 to 120 ° C, more preferably 40 to 110 ° C.
The 10 vol% distillation temperature (T10) of the fuel oil composition for a premixed compression self-ignition engine of the present invention is 40 to 150 ° C, preferably 50 to 140 ° C, more preferably 60 to 130 ° C.
The 50 vol% distillation temperature (T50) of the premixed compression self-ignition engine fuel oil composition of the present invention is 60 to 180 ° C, preferably 70 to 170 ° C, more preferably 80 to 160 ° C.
The 90 vol% distillation temperature (T90) of the premixed compression self-ignition engine fuel oil composition of the present invention is 160 to 250 ° C, preferably 170 to 240 ° C, more preferably 180 to 230 ° C.
The end point (EP) of the fuel oil composition for a premixed compression self-ignition engine of the present invention is 200 to 300 ° C, preferably 210 to 290 ° C, more preferably 220 to 280 ° C.
本発明の予混合圧縮自己着火エンジン用燃料油組成物において、ＩＢＰ、Ｔ１０、Ｔ５０、Ｔ９０及びＥＰが上記範囲内であることにより、運転性や加速性といった自動車用内燃機関としての特性を発揮できる。なお、ＩＢＰ、Ｔ１０、Ｔ５０、Ｔ９０及びＥＰは、ＪＩＳ Ｋ ２２５４「石油製品−蒸留試験方法」に準じて測定した値を意味する。 In the fuel oil composition for a premixed compression self-ignition engine of the present invention, when IBP, T10, T50, T90 and EP are within the above ranges, characteristics as an internal combustion engine for automobiles such as drivability and acceleration can be exhibited. . In addition, IBP, T10, T50, T90, and EP mean values measured in accordance with JIS K 2254 “Petroleum products—distillation test method”.
本発明の予混合圧縮自己着火エンジン用燃料油組成物のセタン価は、３５以上４５以下、好ましくは３６以上４３以下、さらに好ましくは３８以上４０以下である。予混合圧縮自己着火を行う場合において、セタン価が３５以上であることにより、ＨＣの排出量を減少する事が出来る。また、セタン価が４５以下であることにより、予混合圧縮自己着火燃焼をより高負荷で達成しようとする場合、急激な熱発生を伴う場合が少なくなる事から、燃焼騒音を低く保つ事が出来る。なお、セタン価は、ＪＩＳ Ｋ ２２８０「石油製品−燃料油−オクタン価及びセタン価試験方法並びにセタン指数算出方法」に準じて測定した値を意味する。 The cetane number of the fuel oil composition for a premixed compression self-ignition engine of the present invention is from 35 to 45, preferably from 36 to 43, and more preferably from 38 to 40. When premixed compression self-ignition is performed, the amount of HC discharged can be reduced when the cetane number is 35 or more. In addition, since the cetane number is 45 or less, when the premixed compression self-ignition combustion is to be achieved at a higher load, it is possible to keep the combustion noise low because there is less case of sudden heat generation. . The cetane number means a value measured according to JIS K 2280 “Petroleum product-fuel oil-octane number and cetane number test method and cetane index calculation method”.
本発明の予混合圧縮自己着火エンジン用燃料油組成物中の硫黄分は、好ましくは１０質量ｐｐｍ以下、特に好ましく９質量ｐｐｍ以下、さらに好ましくは８質量ｐｐｍ以下である。硫黄分が１０質量ｐｐｍ以下であることにより、排気ガス浄化触媒の能力低下を防止し、排気ガス中のＮＯｘ、ＣＯ、ＨＣの濃度上昇を防止できる。なお、硫黄分は、ＪＩＳ Ｋ ２５４１「原油及び石油製品−硫黄分試験方法」に準じて測定した値を意味する。 The sulfur content in the premixed compression self-ignition engine fuel oil composition of the present invention is preferably 10 ppm by mass or less, particularly preferably 9 ppm by mass or less, and further preferably 8 ppm by mass or less. When the sulfur content is 10 mass ppm or less, it is possible to prevent the exhaust gas purification catalyst from being reduced in capacity and to prevent the concentration of NOx, CO, and HC in the exhaust gas from increasing. The sulfur content means a value measured according to JIS K 2541 “Crude oil and petroleum products—Sulfur content test method”.
本発明の予混合圧縮自己着火エンジン用燃料油組成物の真発熱量は、９５００ｋｃａｌ／ｋｇ以上、好ましくは９６００ｋａｃｌ／ｋｇ以上、さらに好ましくは９７００ｋｃａｌ／ｋｇ以上である。真発熱量が９５００ｋｃａｌ／ｋｇ以上であれば、車両燃費の低下を抑制できる。なお、真発熱量は、ＪＩＳ Ｋ ２２７９「原油及び石油製品−発熱量試験方法及び計算による推定方法」に準じて測定した値を意味する。 The true calorific value of the fuel oil composition for a premixed compression self-ignition engine of the present invention is 9500 kcal / kg or more, preferably 9600 kcal / kg or more, more preferably 9700 kcal / kg or more. When the true heat generation amount is 9500 kcal / kg or more, it is possible to suppress a decrease in vehicle fuel consumption. The true calorific value means a value measured according to JIS K 2279 “Crude oil and petroleum products—heat calorific value test method and calculation estimation method”.
本発明の予混合圧縮自己着火エンジン用燃料油組成物中の芳香族分は、３５容量％以下、好ましくは３０容量％以下、さらに好ましくは２８容量％以下である。燃料油組成物中の芳香族分が３５容量％以下であることにより、完全燃焼性が向上する事から、予混合圧縮自己着火燃焼時にスモークの排出を低減できる。 The aromatic content in the fuel oil composition for a premixed compression self-ignition engine of the present invention is 35% by volume or less, preferably 30% by volume or less, more preferably 28% by volume or less. When the aromatic content in the fuel oil composition is 35% by volume or less, complete combustibility is improved, and smoke emission can be reduced during premixed compression self-ignition combustion.
本発明の予混合圧縮自己着火エンジン用燃料油組成物中のオレフィン分は、１０容量％以下、好ましくは８容量％以下、さらに好ましくは５容量％以下である。燃料油組成物中のオレフィン分が１０容量％以下であることにより、予混合圧縮自己着火燃焼時にスモークの排出を低減出来、また、燃料の貯蔵安定性が悪化しない。 The olefin content in the fuel oil composition for a premixed compression self-ignition engine of the present invention is 10% by volume or less, preferably 8% by volume or less, more preferably 5% by volume or less. When the olefin content in the fuel oil composition is 10% by volume or less, smoke emission can be reduced during premixed compression self-ignition combustion, and the storage stability of the fuel does not deteriorate.
上記燃料油組成物の芳香族分、オレフィン分の含有量は、ＪＩＳ Ｋ ２５３６−２ 「石油製品−成分試験方法−ガスクロによる全成分試験方法」に準じて測定した値を意味する。留分別の芳香族量、オレフィン量については、基材の芳香族量、オレフィン量の配合処方から算出してもよいし、燃料油組成物を蒸留により分留し、それぞれを上記の方法で測定して求めてもよい。 The aromatic content and olefin content of the fuel oil composition mean values measured according to JIS K 2536-2 “Petroleum products—component test method—all component test method by gas chromatography”. Aromatic amount and olefin amount by fractionation may be calculated from the blending recipe of the aromatic amount and olefin amount of the base material, or the fuel oil composition is fractionated by distillation, and each is measured by the above method. You may ask for it.
本発明における予混合圧縮自己着火エンジン用燃料油組成物のＨＦＲＲの磨耗痕径ＷＳ１．４は、４００μｍ以下、好ましくは３９０μｍ以下、さらに好ましくは３８０μｍ以下となる潤滑性能を有することが好ましい。ＨＦＲＲの磨耗痕径ＷＳ１．４が４００μｍを超えると、特に分配型噴射ポンプを搭載したディーゼルエンジンにおいて、運転中のポンプの駆動トルク増、ポンプ各部の磨耗増を引き起こし、排気ガス性能、微小粒子性能の悪化のみならず、エンジン自体が破壊される恐れもあり、また、高圧噴射が可能な電子制御式燃料噴射ポンプにおいても、摺動面等の磨耗が懸念される。なお、本発明でいうＨＦＲＲ摩耗痕径（ＷＳ１．４）とは、社団法人石油学会から発行されている石油学会規格ＪＰＩ−５Ｓ−５０−９８「軽油−潤滑性試験方法」により測定される値を意味する。 The wear scar diameter WS1.4 of HFRR of the fuel oil composition for a premixed compression self-ignition engine in the present invention preferably has a lubricating performance of 400 μm or less, preferably 390 μm or less, more preferably 380 μm or less. When the wear scar diameter WS1.4 of HFRR exceeds 400 μm, especially in a diesel engine equipped with a distribution type injection pump, it increases the driving torque of the pump during operation and increases the wear of each part of the pump, exhaust gas performance, fine particle performance In addition to the deterioration of the engine, the engine itself may be destroyed. Also, in an electronically controlled fuel injection pump capable of high pressure injection, there is a concern about wear on the sliding surface. The HFRR wear scar diameter (WS1.4) as used in the present invention is a value measured by the Petroleum Institute Standard JPI-5S-50-98 “Light Oil-Lubricity Test Method” issued by the Japan Petroleum Institute. Means.
本発明の予混合圧縮自己着火エンジン用燃料油組成物は、含酸素化合物を含有する。本発明の予混合圧縮自己着火エンジン用燃料油組成物に含有される含酸素化合物は、アルコール又はモノエーテルであり、好ましくは軽質の含酸素化合物である。本発明の予混合圧縮自己着火エンジン用燃料油組成物に含有される含酸素化合物は、アルコール及びモノエーテルのいずれか一方であっても、アルコール及びモノエーテルの組み合わせであってもよい。本発明の予混合圧縮自己着火エンジン用燃料油組成物に含有される含酸素化合物としては、例えば、エタノール、エチルターシャリーブチルエーテル（ＥＴＢＥ）、ターシャリーブタノール（ＴＢＡ）、メタノール、プロパノール、イソプロパノール、ブタノール、イソブチルアルコール、１−ブタノール、２−ブタノール、メチルターシャリーブチルエーテル（ＭＴＢＥ）、ジメチルエーテル、エチルメチルエーテル、ジエチルエーテル等が挙げられ、これらのうち、エタノール、エチルターシャリーブチルエーテル（ＥＴＢＥ）が好ましい。本発明の予混合圧縮自己着火エンジン用燃料油組成物に含有される含酸素化合物は、１種単独であっても２種以上の組み合わせであってもよい。 The fuel oil composition for a premixed compression self-ignition engine of the present invention contains an oxygen-containing compound. The oxygen-containing compound contained in the fuel oil composition for a premixed compression self-ignition engine of the present invention is an alcohol or a monoether, preferably a light oxygen-containing compound. The oxygen-containing compound contained in the fuel oil composition for a premixed compression self-ignition engine of the present invention may be any one of alcohol and monoether, or a combination of alcohol and monoether. Examples of the oxygen-containing compound contained in the fuel oil composition for a premixed compression self-ignition engine of the present invention include ethanol, ethyl tertiary butyl ether (ETBE), tertiary butanol (TBA), methanol, propanol, isopropanol, and butanol. , Isobutyl alcohol, 1-butanol, 2-butanol, methyl tertiary butyl ether (MTBE), dimethyl ether, ethyl methyl ether, diethyl ether and the like. Of these, ethanol and ethyl tertiary butyl ether (ETBE) are preferred. The oxygen-containing compound contained in the fuel oil composition for a premixed compression self-ignition engine of the present invention may be used alone or in combination of two or more.
本発明の予混合圧縮自己着火エンジン用燃料油組成物に含有される含酸素化合物の炭素数は、好ましくは１〜６、特に好ましくは２〜６である。そして、含酸素化合物がアルコールの場合、含酸素化合物としては、炭素数が２〜６のアルコールが好ましく、炭素数２〜４のアルコールが特に好ましい。また、含酸素化合物がモノエーテルの場合、含酸素化合物としては、炭素数が２〜６のモノエーテルが好ましく、炭素数３〜６のモノエーテルが特に好ましい。 The carbon number of the oxygen-containing compound contained in the fuel oil composition for a premixed compression self-ignition engine of the present invention is preferably 1-6, particularly preferably 2-6. When the oxygen-containing compound is alcohol, the oxygen-containing compound is preferably an alcohol having 2 to 6 carbon atoms, particularly preferably an alcohol having 2 to 4 carbon atoms. When the oxygen-containing compound is a monoether, the oxygen-containing compound is preferably a monoether having 2 to 6 carbon atoms, particularly preferably a monoether having 3 to 6 carbon atoms.
本発明の予混合圧縮自己着火エンジン用燃料油組成物に含有される含酸素化合物の分子量は、好ましくは３２〜１０２であり、特に好ましくは４６〜１０２である。含酸素化合物の分子量が上記範囲内にある事により、スモーク排出量の低減を達成することができる。 The molecular weight of the oxygen-containing compound contained in the fuel oil composition for a premixed compression self-ignition engine of the present invention is preferably 32 to 102, particularly preferably 46 to 102. When the molecular weight of the oxygen-containing compound is within the above range, a reduction in smoke emission can be achieved.
本発明の予混合圧縮自己着火エンジン用燃料油組成物の含酸素化合物の含有量は、２〜１５容量％、好ましくは３〜１３容量％、さらに好ましくは５〜１２容量％である。含酸素化合物の含有量が上記範囲にあることにより、スモーク排出量の低減を達成することが出来る。なお、本発明の予混合圧縮自己着火エンジン用燃料油組成物が、複数種の含酸素化合物を含有する場合、含酸素化合物の含有量とは、それら複数種の含酸素化合物の合計の含有量を指す。 The content of the oxygen-containing compound in the fuel oil composition for a premixed compression self-ignition engine of the present invention is 2 to 15% by volume, preferably 3 to 13% by volume, and more preferably 5 to 12% by volume. When the content of the oxygen-containing compound is in the above range, a reduction in smoke emission can be achieved. When the fuel oil composition for a premixed compression self-ignition engine of the present invention contains a plurality of oxygenated compounds, the oxygenated compound content is the total content of the plurality of oxygenated compounds. Point to.
本発明の予混合圧縮自己着火エンジン用燃料油組成物が、含酸素化合物として、ＥＴＢＥを含有する場合、含酸素化合物全体に占めるＥＴＢＥの割合（（ＥＴＢＥ／含酸素化合物の合計）×１００）は、好ましくは８０容量％以上、さらに好ましくは８５容量％以上である。
また、本発明の予混合圧縮自己着火エンジン用燃料油組成物が、含酸素化合物として、エタノールを含有する場合、含酸素化合物全体に占めるエタノールの割合（（エタノール／含酸素化合物の合計）×１００）は、好ましくは９０容量％以上、さらに好ましくは９５容量％以上である。
また、本発明の予混合圧縮自己着火エンジン用燃料油組成物が、含酸素化合物として、ＥＴＢＥ及びエタノールを含有する場合、含酸素化合物に占めるＥＴＢＥの割合（（ＥＴＢＥ／含酸素化合物の合計）×１００）は、好ましくは８０容量％以上、さらに好ましくは８５容量％以上であり、含酸素化合物に占めるエタノールの割合（（エタノール／含酸素化合物の合計）×１００）は、好ましくは１５容量％以下、さらに好ましくは１０容量％以下である。
また、本発明の予混合圧縮自己着火エンジン用燃料油組成物が、含酸素化合物として、ＥＴＢＥ、エタノール及びＴＢＡを含有する場合、含酸素化合物に占めるＥＴＢＥの割合（（ＥＴＢＥ／含酸素化合物の合計）×１００）は、好ましくは８０容量％以上、さらに好ましくは８５容量％以上であり、含酸素化合物に占めるエタノールの割合（（エタノール／含酸素化合物の合計）×１００）は、好ましくは１５容量％以下、さらに好ましくは１０容量％以下であり、含酸素化合物に占めるＴＢＡの割合（（ＴＢＡ／含酸素化合物の合計）×１００）は、好ましくは１容量％以下、さらに好ましくは０．８容量％以下である。
ＥＴＢＥ、エタノール又はＴＢＡの割合が上記範囲内であることにより、スモーク排出量の低減効果が高くなる。
When the premixed compression self-ignition engine fuel oil composition of the present invention contains ETBE as the oxygen-containing compound, the ratio of ETBE to the entire oxygen-containing compound ((ETBE / total of oxygen-containing compounds) × 100) is Preferably, it is 80 volume% or more, More preferably, it is 85 volume% or more.
Further, when the premixed compression self-ignition engine fuel oil composition of the present invention contains ethanol as the oxygen-containing compound, the ratio of ethanol to the entire oxygen-containing compound ((total of ethanol / oxygen-containing compounds) × 100 ) Is preferably 90% by volume or more, and more preferably 95% by volume or more.
When the premixed compression self-ignition engine fuel oil composition of the present invention contains ETBE and ethanol as oxygenated compounds, the ratio of ETBE in the oxygenated compounds ((total of ETBE / oxygenated compounds) × 100) is preferably 80% by volume or more, more preferably 85% by volume or more, and the proportion of ethanol in the oxygenated compound ((total of ethanol / oxygenated compound) × 100) is preferably 15% by volume or less. More preferably, it is 10% by volume or less.
Further, when the premixed compression self-ignition engine fuel oil composition of the present invention contains ETBE, ethanol and TBA as oxygenated compounds, the ratio of ETBE to the oxygenated compounds ((total of ETBE / oxygenated compounds) ) × 100) is preferably 80% by volume or more, more preferably 85% by volume or more, and the proportion of ethanol in the oxygenated compound ((total of ethanol / oxygenated compound) × 100) is preferably 15% by volume. % Or less, more preferably 10% by volume or less, and the proportion of TBA in the oxygenated compound ((total of TBA / oxygenated compound) × 100) is preferably 1% by volume or less, more preferably 0.8 volume. % Or less.
When the ratio of ETBE, ethanol, or TBA is within the above range, the effect of reducing smoke discharge is increased.
本発明の予混合圧縮自己着火エンジン用燃料油組成物に用いられるＥＴＢＥは、製造方法は特に限定されるものではなく、一般的に製造されるものが使用可能であるが、ＥＴＢＥと同時に得られる未反応のエタノールと副生成物であるＴＢＡの含有量を確認し、上記で規定する範囲に治まるよう原料組成や反応条件を調整することで得ることが出来る。 The production method of the ETBE used in the fuel oil composition for the premixed compression self-ignition engine of the present invention is not particularly limited, and a generally produced one can be used, but is obtained at the same time as ETBE. It can be obtained by confirming the contents of unreacted ethanol and TBA as a by-product, and adjusting the raw material composition and reaction conditions so as to be within the range specified above.
本発明の予混合圧縮自己着火エンジン用燃料油組成物の１５℃密度は、０．６８３〜０．７８３ｇ／ｃｍ３、好ましくは０．６９０〜０．７７８ｇ／ｃｍ３、さらに好ましくは０．６９５〜０．７７３ｇ／ｃｍ３である。密度が上記範囲内にあることにより、車両燃費の低下やＨＣやＣＯの排出を抑制できる。なお、密度は、ＪＩＳ Ｋ ２２４９「原油及び石油製品−密度試験方法及び密度・質量・容量換算表」に準じて測定した値を意味する。 The fuel oil composition for a premixed compression self-ignition engine of the present invention has a density of 15 ° C. of 0.683 to 0.783 g / cm 3 , preferably 0.690 to 0.778 g / cm 3 , and more preferably 0.695. it is a ~0.773g / cm 3. When the density is within the above range, it is possible to suppress the reduction in vehicle fuel consumption and the emission of HC and CO. The density means a value measured according to JIS K 2249 “Crude oil and petroleum products—Density test method and density / mass / capacity conversion table”.
本発明の予混合圧縮自己着火エンジン用燃料油組成物は、基材として、原油を常圧蒸留して得られるナフサ留分、ナフサ留分を脱硫して得られる脱硫ナフサ、脱硫ナフサを接触改質して得られる改質ガソリン、改質ガソリンからベンゼンを取り除いた脱ベンゼン改質ガソリン、原油を常圧蒸留して得られる灯軽油留分、灯軽油留分を脱硫して得られる脱硫灯軽油、重質油を接触分解、水素化分解又は熱分解して得られるガソリン又は灯軽油留分、オレフィンとイソブタンから生成されるアルキレート、ナフサ留分を接触処理し異性化したアイソメレート、炭素数４又は５の炭化水素等を用い、これらの基材と含酸素化合物を適宜配合することにより、調製される。また、本発明の予混合圧縮自己着火燃焼用燃料油組成物において、基材としては、フィッシャートロプシュ合成によるパラフィン系炭化水素、種々の炭素数を有するパラフィン系溶剤、ナフテン系溶剤、芳香族系溶剤等も用いられる。 The fuel oil composition for a premixed compression self-ignition engine of the present invention comprises, as a base material, a naphtha fraction obtained by atmospheric distillation of crude oil, a desulfurized naphtha obtained by desulfurizing a naphtha fraction, and a desulfurized naphtha by contact modification. Reformed gasoline obtained by reforming, debenzene-modified gasoline obtained by removing benzene from reformed gasoline, kerosene fraction obtained by atmospheric distillation of crude oil, desulfurized kerosene obtained by desulfurizing kerosene fraction , Gasoline or kerosene fraction obtained by catalytic cracking, hydrocracking or pyrolysis of heavy oil, alkylate produced from olefin and isobutane, isomerized by isomerization by catalytic treatment of naphtha fraction, carbon number It is prepared by using 4 or 5 hydrocarbons or the like and appropriately mixing these base materials and oxygen-containing compounds. In the premixed compression self-ignition combustion fuel oil composition of the present invention, the base material includes paraffinic hydrocarbons by Fischer-Tropsch synthesis, paraffinic solvents having various carbon numbers, naphthenic solvents, and aromatic solvents. Etc. are also used.
本発明の予混合圧縮自己着火エンジン用燃料油組成物は、上記のように各種の基材を適宜配合する際、燃料油組成物としての性状が本発明で規定する範囲に含まれるように調製することも可能である。 The fuel oil composition for a premixed compression self-ignition engine of the present invention is prepared so that the properties as a fuel oil composition are included in the range defined by the present invention when various base materials are appropriately blended as described above. It is also possible to do.
本発明の予混合圧縮自己着火エンジン用燃料油組成物は、必要に応じて、各種添加剤を含有することが出来る。この添加剤としては、チオアミド化合物等の金属不活性剤、有機リン系化合物等の表面着火防止剤、コハク酸イミド、ポリアルキルアミン、ポリエーテルアミン、ポリイソブテンアミン等の清浄分散剤、多価アルコール及びそのエーテル等の氷結防止剤、有機酸のアルカリ金属やアルカリ土類金属塩、高級アルコールの硫酸エステル等の助燃剤、アニオン系界面活性剤、カチオン系界面活性剤、良性界面活性剤等の帯電防止剤、アルケニルコハク酸エステル等の錆止め剤、アゾ染料等の着色剤等、公知の燃料添加剤が挙げられる。これらの添加剤は、１種単独であっても２種以上の組み合わせであってもよい。本発明の予混合圧縮自己着火エンジン用燃料油組成物中のこれら添加剤の含有量は任意であるが、通常、添加剤の合計含有量は、０．１質量％以下であることが好ましい。 The fuel oil composition for a premixed compression self-ignition engine of the present invention can contain various additives as necessary. Examples of the additives include metal deactivators such as thioamide compounds, surface ignition preventives such as organic phosphorus compounds, succinimides, polyalkylamines, polyetheramines, polyisobuteneamine and other detergent dispersants, polyhydric alcohols, and the like. Anti-freezing agents such as ethers, anti-freezing agents such as alkali metals and alkaline earth metal salts of organic acids, sulfates of higher alcohols, anionic surfactants, cationic surfactants, benign surfactants, etc. And known fuel additives such as rust inhibitors such as alkenyl succinic acid esters and colorants such as azo dyes. These additives may be used alone or in combination of two or more. Although the content of these additives in the fuel oil composition for a premixed compression self-ignition engine of the present invention is arbitrary, it is usually preferable that the total content of the additives is 0.1% by mass or less.
以下に本発明の内容を実施例及び比較例により更に詳しく説明するが、本発明はこれらによって制限されるものではない。 The content of the present invention will be described in more detail with reference to Examples and Comparative Examples below, but the present invention is not limited thereto.
実施例１〜８、参考例１、比較例１〜３の燃料油組成物の調製に用いた含酸素基材に占める各含酸素化合物の割合を表１に、各基材の配合割合を表２に、重質接触改質ガソリンの性状を表３に示す。 Table 1 shows the ratio of each oxygen-containing compound in the oxygen-containing base materials used in the preparation of the fuel oil compositions of Examples 1 to 8, Reference Example 1 and Comparative Examples 1 to 3, and Table 1 shows the blending ratio of each base material. Table 3 shows the properties of heavy contact reformed gasoline.
表中、ＥＴＢＥはエチルターシャリーブチルエーテル、ＥｔＯＨはエタノール、ＴＢＡはターシャリーブタノール、Ｄｉｇｌｙｍｅはジエチレングリコールジメチルエーテルである。 In the table, ETBE is ethyl tertiary butyl ether, EtOH is ethanol, TBA is tertiary butanol, and Diglyme is diethylene glycol dimethyl ether.
（試験に用いたエンジン）
評価試験エンジンとして、直列４気筒、排気量２．２Ｌ、コモンレール方式の燃料噴射装置及びインタークーラー付のターボ加給機、クールド排気ガス再循環装置が搭載されているディーゼルエンジンを使用した。本試験エンジンの主要緒言を表４に示す。本試験エンジンにおいて、圧縮比を１５．８とし、燃料の噴射時期を、通常のディーゼル燃焼の場合に比べ早期に設定することにより、予混合圧縮自己着火燃焼を可能にしている。
(Engine used for testing)
As an evaluation test engine, a diesel engine equipped with an inline 4-cylinder engine, a displacement of 2.2 L, a common rail fuel injection device, a turbo charger with an intercooler, and a cooled exhaust gas recirculation device was used. Table 4 shows the main introduction of the test engine. In this test engine, premixed compression self-ignition combustion is enabled by setting the compression ratio to 15.8 and setting the fuel injection timing earlier than in the case of normal diesel combustion.
（スモーク排出量試験）
本試験エンジンを用いて、エンジン回転数：２０００ｒｐｍ、燃料噴射圧力：５０ＭＰａ、噴射時期：上死点３０℃前、噴射量：１６ｍｍ３／ｓｔの条件で試験を実施し、予混合圧縮着火燃焼時のスモーク排出量[ＦＳＮ]（ＦＳＮ：Ｆｉｌｔｅｒ Ｓｍｏｋｅ Ｎｕｍｂｅｒ）を測定した。
(Smoke emission test)
Using this test engine, the test was carried out under the conditions of engine speed: 2000 rpm, fuel injection pressure: 50 MPa, injection timing: before top dead center 30 ° C., injection amount: 16 mm 3 / st, and during premixed compression ignition combustion The smoke emission amount [FSN] (FSN: Filter Smoke Number) was measured.
表６から明らかなように、特定の含酸素化合物を特定量含有している本発明の実施例の予混合圧縮自己着火エンジン用燃料油組成物は、各噴射時期に生成するスモーク排出量が少ないことがわかる。一方、比較例１では含酸素化合物としてトリエーテルであるジグリムを用いているためスモーク排出量が多くなっている。比較例２では含酸素基材の配合量が規定を外れるため潤滑性能が劣る。比較例３も同様に含酸素基材の配合量が規定を外れるため燃料油組成物として表面張力の規定が外れる。 As is apparent from Table 6, the premixed compression self-ignition engine fuel oil composition of the present invention containing a specific amount of a specific oxygenate has a small amount of smoke generated at each injection timing. I understand that. On the other hand, in Comparative Example 1, since diglyme, which is a triether, is used as the oxygen-containing compound, the smoke discharge amount is increased. In Comparative Example 2, the lubrication performance is inferior because the blending amount of the oxygen-containing base material is out of specification. Similarly, since the blending amount of the oxygen-containing base material is out of the regulation in Comparative Example 3, the surface tension is out of the regulation as the fuel oil composition.
Claims (2)
燃料のセタン価が３５〜４５の範囲にあり、初留点が２０℃以上１３０℃以下、５０容量％留出点が６０℃以上１８０℃以下、終点が２００℃以上３００℃以下であり、３０℃における動粘度が０．６ｍｍ２／ｓ以上０．８２ｍｍ２／ｓ以下であり、２５℃における表面張力が２０．０ｍＮ／ｍ以上２３．５ｍＮ／ｍ以下であり、
該含酸素化合物がアルコール又はモノエーテルであり、該含酸素化合物の含有量が２〜１５容量％であること、
を特徴とする予混合圧縮自己着火エンジン用燃料油組成物。 A fuel oil composition for a premixed compression self-ignition engine containing an oxygen-containing compound,
The cetane number of the fuel is in the range of 35 to 45, the initial boiling point is 20 ° C. or higher and 130 ° C. or lower, the 50% by volume distillation point is 60 ° C. or higher and 180 ° C. or lower, and the end point is 200 ° C. or higher and 300 ° C. or lower. ° C. kinematic viscosity of 0.6 mm 2 / s or more at 0.82mm and at 2 / s or less, a surface tension at 25 ° C. or less 20.0mN / m or more 23.5mN / m,
The oxygen-containing compound is alcohol or monoether, and the content of the oxygen-containing compound is 2 to 15% by volume;
A fuel oil composition for a premixed compression self-ignition engine.
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