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首页> 外文期刊>Energy & fuels >Low-Load Dual-Fuel Compression Ignition (CI) Engine Operation with an On-Board Reformer and a Diesel Oxidation Catalyst: Effects on Engine Performance and Emissions
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Low-Load Dual-Fuel Compression Ignition (CI) Engine Operation with an On-Board Reformer and a Diesel Oxidation Catalyst: Effects on Engine Performance and Emissions

机译：带车载重整器和柴油氧化催化剂的低负荷双燃料压燃（CI）发动机运行：对发动机性能和排放的影响

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In the exhaust gas fuel-reforming method, part of the engine exhaust gas reacts with small amounts of engine fuel in a mini-reactor fitted in the exhaust gas reeirculation (EGR) loop to produce gaseous fuel named reformed EGR (REGR). In this study, hot REGR (gas containing H_2, CO, CH_4, and CO_2) was fed back to the engine inlet, so that the diesel engine in effect operated in dual fuel with inlet heating and EGR (CO_2 existence). The effects of the diesei engine dual fueling with different REGR percentages on the engine performance and emissions have been examined. The study focused at low-load engine operation, where the conditions are not favorable for efficient gaseous fuel oxidation and engine combustion stability. The addition of the premixed gaseous fuel resulted in a remarkable reduction of both NO_x and smoke engine emissions. Carbon monoxide and hydrogen oxidation efficiency can be improved by careful selection of REGR addition (e.g., premixed air/fuel ratio, inlet temperature, and reduced in-cylinder O_2 concentration) and in-cylinder diesel injection timing. The use of Pi supported on Al_2O_3 as an oxidation catalyst at the engine exhaust can eliminate both CO and H_2 at temperatures lower than the engine exhaust gas temperature at part loads. Preferably, in an actual engine reformer system, the uncombusted CO and H_2 will be used to enhance the aftertrcatment system (I.e., diesel particulate filter, NO_x traps, and hydrocarbon-selective catalytic reduction of NO_x) performance.
机译：在废气燃料重整方法中，一部分发动机废气在安装在废气再再循环（EGR）回路中的微型反应器中与少量发动机燃料发生反应，从而产生称为重整EGR（REGR）的气态燃料。在这项研究中，热的REGR（包含H_2，CO，CH_4和CO_2的气体）被送回发动机进气口，因此，实际上柴油发动机在进气口加热和EGR的情况下以双燃料运行（存在CO_2）。研究了不同REGR百分比的柴油发动机双燃料加注对发动机性能和排放的影响。该研究的重点是低负荷发动机运行，在这种情况下，条件不利于有效的气体燃料氧化和发动机燃烧稳定性。预混合气态燃料的加入显着减少了NO_x和烟机排放。可以通过仔细选择REGR添加量（例如，预混合的空燃比，进气温度和降低的缸内O_2浓度）和缸内柴油喷射正时来提高一氧化碳和氢氧化效率。在发动机排气中使用负载在Al_2O_3上的Pi作为氧化催化剂可以在低于部分负载的发动机排气温度的情况下消除CO和H_2。优选地，在实际的发动机重整系统中，未燃烧的CO和H_2将用于增强后补系统（即，柴油机微粒过滤器，NO_x捕集器和烃选择性催化还原NO_x）的性能。

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