Please use this identifier to cite or link to this item: http://hdl.handle.net/11455/98455
標題: 以甲醇重組器產生富氫氣體做為柴油引擎輔助燃料與濾煙器再生燃料之系統設計與實驗分析
System design and experimental investigations on the methanol reformer that producing hydrogen-rich gas as auxiliary fuel for diesel engine and the fuel for the regeneration of DPF
作者: 王正岳
Cheng-Yueh Wang
關鍵字: 柴油引擎
濾煙器
廢氣再循環
甲醇重組器
富氫氣體
Diesel Engine
Diesel Particulate filter
exhaust gas re-circulation re-combustion system
Methanol reformer
Hydrogen-rich gas
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摘要: 本文為將重組出的富氫氣體拿來當作柴油引擎輔助燃料以及濾煙器再生用的燃料時引擎性能與排氣污染的影響。並將廢氣循環再燃燒系統(EGR)與廢熱回收式的甲醇重組器系統結合,利用旁通閥將部分排氣倒入廢氣循環再燃燒系統中,用排氣的廢熱加熱重組器使其產生含有氫氣的重組氣,平時當作引擎輔助燃料使用,必要時則將重組氣倒入濾煙器做為再生時的燃料。氫氣是一種乾淨燃料,燃燒後的產物主要為水,但不易裝備與儲存。而運用在車輛上是以甲醇與水蒸氣的燃料重組器所提供氫氣,但蒸氣重組法是吸熱反應,所以我們藉由把重組器系統設置在廢氣再循環系統中,利用排氣廢熱加熱,這樣的做法有兩種優點,一種為產出的富氫氣體會使引擎熱效率提高,另一種優點的來自廢熱回收。 近年環保意識抬頭,柴油車汙染排放問題越來越受到關注,尤其是世界衛生組織 (WHO) 正式把柴油引擎廢氣歸列為致癌物後,世界各國為保障民眾的健康紛紛的推動制定更嚴格的標準,對柴油引擎廢氣排放來加強管制。在台灣由於使用超過十年以上的老舊柴油車數量仍為數不少,因此為管制及降低行駛中老舊車輛的汙染排放,勢必對車輛加裝排氣後處理系統,而濾煙器(Diesel Particulate Filter)則是目前最普遍使用的系統,但由於濾煙器碳粒累積一定的量就需要再生,因為再生過程中容易將濾心給燒破,且會造成所謂的'二次汙染'及其排放的再生高溫廢氣可能的災害。但是大部分的再生是使用汽油作為再生時燃料,而我們則是將氫氣替代汽油作為再生時的燃料,若氫氣的產量不夠,則讓氫氣替代一部份的汽油作為燃料燃燒。 本文建立的兩種重組器中,由於第一種重組器的效果極差,冷啟動時間長,且產氫效果極差,可能是因為大部分的甲醇水提前跟排氣管中的氧反應。於是將甲醇水噴注位置提前,並改善觸媒放置的方式,此為第二種重組器。發現第二種效果較好,氫氣產量最低6.87%,最高29.66%。
This paper uses the reformed hydrogen-rich gas as an alternative fuel for diesel engines and for filter regenerators to test engine heat efficiency and exhaust pollution. We combined the exhaust gas re-circulation re-combustion system (EGR) with the waste heat recover type methanol reformer system, and used the bypass valve to pour part of the exhaust gas into the exhaust gas re-circulation and re-combustion system. Using the exhaust waste heat to heat the reformer to make it contain hydrogen reformed gas which is used as an alternative fuel under normal usage. If necessary, these reformed gas will poured into the filter which used as a fuel for regeneration. Hydrogen is a clean fuel. The product after combustion is mainly water, but it is not easy to equip and store. And in vehicle, fuel reformer is used to supply hydrogen, which use methanol and steam as the fuel; However, the steam reforming method is an endothermic reaction. Therefore, we set the reformer system in the exhaust gas recirculation system and use exhaust heat to heat it. This method has two advantages. One is the production of hydrogen-rich gas will increase the thermal efficiency of engine. The other advantage is exhaust heat recovery. There is a growing concern for the pollutants emitted by diesel vehicles, especially the World Health Organization (WHO) had officially classified diesel engine exhaust as a carcinogen. Countries all over the world have formulated stringent standards to regulate the emissions of new diesel engines. However, diesel engines are very durable that 60% of the diesel vehicles are more than ten years old in Taiwan. In order to reduce the exhaust emission of these in use vehicles, installation of diesel particulate filter (DPF) is currently promoted. However, most of the regeneration is the use of gasoline as the fuel for regeneration, and we use hydrogen instead of gasoline as the fuel for regeneration. If the hydrogen production is insufficient, hydrogen is used instead of a portion of the gasoline as fuel. In this paper, we have established two hydrogen reformer. One has very low efficiency. It need high activate time and produce only a little hydrogen. Maybe most of the methanol water react with oxygen inside exhaust pipe too early. Therefore, we move forward the injection position of methanol water, improving the way to set catalyst. We have found that this one get a better efficiency. The lowest concentration of hydrogen is 6.87%. The highest concentration of hydrogen is 29.66%.
URI: http://hdl.handle.net/11455/98455
文章公開時間: 10000-01-01
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