Base on industrial research and experience, the process of methanol distillation is analyzed,and above all, a new concept of high pressure flowsheet and low pressure flowsheet is defined. The new configuration helps t...Base on industrial research and experience, the process of methanol distillation is analyzed,and above all, a new concept of high pressure flowsheet and low pressure flowsheet is defined. The new configuration helps to handle problems encountered in many factories in China. The inter influence between process and column internal pattern is also pointed out. Recommendation of new column internal designs is given. Finally, industrial examples tell the how the new concept works and the possibility of combining process to give more opens to solve engineering problems.展开更多
针对甲醇发动机难以形成浓度合适的混合气而造成冷起动困难的问题,以一台应用自主开发的进气道低压空气辅助喷射系统(air assisted port injection,AAPI)的单缸甲醇发动机为研究对象开展试验研究,探究不采用辅助措施通过AAPI喷射实现甲...针对甲醇发动机难以形成浓度合适的混合气而造成冷起动困难的问题,以一台应用自主开发的进气道低压空气辅助喷射系统(air assisted port injection,AAPI)的单缸甲醇发动机为研究对象开展试验研究,探究不采用辅助措施通过AAPI喷射实现甲醇高雾化对甲醇发动机冷起动的影响及规律。试验表明AAPI明显加快了甲醇发动机冷起动前可燃混合气的形成速率。AAPI甲醇发动机着火前过量空气系数λ的平均变化率值和峰值变化率分别是普通喷射方式的3.2倍和2.26倍。点火时刻对AAPI甲醇发动机冷起动影响较大,为使AAPI甲醇发动机的冷起动性能最优,需配合合适的点火时刻,试验条件下最佳点火时刻为活塞压缩上止点前20°。AAPI甲醇发动机的冷起动性能受环境温度影响较大,随着环境温度的降低,甲醇发动机冷起动时间增长;不采用辅助措施,AAPI甲醇发动机在5℃时能实现可靠冷起动。展开更多
文摘Base on industrial research and experience, the process of methanol distillation is analyzed,and above all, a new concept of high pressure flowsheet and low pressure flowsheet is defined. The new configuration helps to handle problems encountered in many factories in China. The inter influence between process and column internal pattern is also pointed out. Recommendation of new column internal designs is given. Finally, industrial examples tell the how the new concept works and the possibility of combining process to give more opens to solve engineering problems.
文摘针对甲醇发动机难以形成浓度合适的混合气而造成冷起动困难的问题,以一台应用自主开发的进气道低压空气辅助喷射系统(air assisted port injection,AAPI)的单缸甲醇发动机为研究对象开展试验研究,探究不采用辅助措施通过AAPI喷射实现甲醇高雾化对甲醇发动机冷起动的影响及规律。试验表明AAPI明显加快了甲醇发动机冷起动前可燃混合气的形成速率。AAPI甲醇发动机着火前过量空气系数λ的平均变化率值和峰值变化率分别是普通喷射方式的3.2倍和2.26倍。点火时刻对AAPI甲醇发动机冷起动影响较大,为使AAPI甲醇发动机的冷起动性能最优,需配合合适的点火时刻,试验条件下最佳点火时刻为活塞压缩上止点前20°。AAPI甲醇发动机的冷起动性能受环境温度影响较大,随着环境温度的降低,甲醇发动机冷起动时间增长;不采用辅助措施,AAPI甲醇发动机在5℃时能实现可靠冷起动。