IGNITION CONTROL IN THE HCCI COMBUSTION ENGINE SYSTEM FUELLED WITH METHANOL-REFORMED GASES
IGNITION CONTROL IN THE HCCI COMBUSTION ENGINE SYSTEM FUELLED WITH METHANOL-REFORMED GASES
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发表时间：
2005
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通讯作者：
T. Shudo
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作者：
T. Shudo
与传统的燃烧系统相比，均质充量压缩点火（HCCI）燃烧能够在内燃机中实现更高的热效率和更低的NOx排放。作者等提出了一种以高十六烷值二甲醚（DME）和高抗爆性甲醇重整气（MRG）为燃料的HCCI发动机系统，该系统利用发动机排气余热，通过车载重整器由甲醇生产DME和MRG。已经表明，调节两种燃料的分数有效地控制了HCCI中低温氧化的持续时间和高温氧化的开始。点火控制扩大了当量比和发动机负荷的可操作范围。通过HCCI操作的稀薄燃烧和通过利用发动机排气热的燃料重整的废热回收实现了高的总热效率。MRG由氢气和一氧化碳组成，其点火控制作用主要由氢气引起。本文综述了甲醇重整气均质压燃发动机系统的特点。
Homogeneous charge compression ignition (HCCI) combustion enables higher thermal efficiency and lower NOx emission to be achieved in internal combustion engines compared to conventional combustion systems. A new concept HCCI engine system fueled with dimethyl ether (DME) with a high cetane number and methanol-reformed gas (MRG) with high anti-knock properties has been proposed by the author et al. In the system, both DME and MRG are to be produced from methanol by onboard reformers utilizing the engine exhaust heat. It has been shown that adjusting the fraction of the two fuels effectively controls the duration of the low-temperature oxidation and the onset of the high-temperature oxidation in HCCI. The ignition control expands the operable range of equivalence ratio and engine load. Lean combustion by HCCI operation and a waste heat recovery by the fuel reforming utilizing engine exhaust heat achieve a high overall thermal efficiency. While MRG consists of hydrogen and carbon monoxide, the ignition control effect of MRG is attributed mostly to hydrogen. The current paper reviews the characteristics of the HCCI engine system fuelled with methanol reformed gases.