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可靠的柴油颗粒过滤器(DPF)再生

以全流量燃烧器技术实现可靠的柴油颗粒过滤器(DPF)再生道路型和非道路型应用柴油颗粒过滤器加装技术研讨会北京,2010年10月27日-28日Guenter Palmer博士,Frank Terres目录柴油颗粒过滤再生技术催化燃烧器全尺寸点火燃烧器 总结…最近摄于上海的景象…烟灰颗粒物来源:FEV 2005例如:2000 1/min; pme = 2bar 烟灰75%SOF (润滑油和燃油)18% 水3,8% 硫酸盐2,9% 硝酸盐0,3%燃灰壁流过滤器“开放过滤器”堇青石、SiC、AT或烧结金属烧结金属、泡沫材料、金属丝网>95%过滤效率要求进行烟灰负载控制要求进行主动再生捕集燃灰Î维护壁流过滤器内的烟灰沉积来源:FEV 200599,9%过滤效率采用DPF时未采用DPF时Plus后喷射柴油蒸发器/喷射器柴油燃烧器是是是否节流后喷射后喷射/节流小型燃烧器否连续定期定期定期定期有限制有限制无限制无限制无限制低低低高无无---D O CDPF喷射器/蒸发器DC-DPF OC催化燃烧器系统ƒ HC(柴油燃油)通过喷射器 或蒸发器直接喷射进入 废气系统 ƒ 要求采用主动DOC Æ >270°C ƒ HC将在DOC内均匀分布 以避免过大的热梯度 ƒ HC在DOC内催化燃烧 以提供DPF再生所需热量DPFDOCCopyright © Tenneco Inc. This document and the information embodied herein is the property of Tenneco Inc. and is disclosed in confidence for informational purposes only. It may not be copied, disclosed or used for any purpose without the prior written consent of Tenneco Inc..HC喷射器要求ƒ 小液滴 – 快速柴油蒸发 – 均匀的DOC冲击 ƒ 可能要求采用混合器 ƒ 对烟灰阻塞抵抗性好 ƒ 耐高温 ƒ 对柴油燃油(HC)耐受度好 ƒ 对于废气压力波动不敏感 ƒ 可缩放式设计,能够覆盖 多种发动机规格D32 D10 D31 Dv0.1 Dv0.5 Dv0.9 µm 55 38 50 34 61 92Copyright © Tenneco Inc. This document and the information embodied herein is the property of Tenneco Inc. and is disclosed in confidence for informational purposes only. It may not be copied, disclosed or used for any purpose without the prior written consent of Tenneco Inc..蒸发器要求ƒ 较具挑战性设计方案偏好采用 的技术,如短混合长度设计 ƒ 烟灰堵塞抵抗性好 ƒ 低电功率消耗 ƒ 最大纯蒸气流量 取决于装机电功率实现 ƒ 蒸气内液滴份额最少 ƒ 可缩放设计,可覆盖范围多种 发动机规格600 500 Temperature [°C] 400 300 200 100 0Comparison of temperatures on DEC with vs. w/o HC dosingVariable Velocity Tmax with HC Tmax w/o HC100 80 60 40 1 100 200 300 400 500 Time [sec] 600 700 800 20 Velocity [km/h]Copyright © Tenneco Inc. This document and the information embodied herein is the property of Tenneco Inc. and is disclosed in confidence for informational purposes only. It may not be copied, disclosed or used for any purpose without the prior written consent of Tenneco Inc..全尺寸点火燃烧器要求ƒ ƒ 在整个发动机运行范围内以及动态运行条件下(NRTC、ETC) 具备DPF再生温度 恒定而均匀的DPF再生温度– – (ΔT)t = ± 25K (ΔT)xy = ± 50K700600ƒ ƒ ƒ ƒ火焰稳定,避免二次排放 高效空气泵 最大程度利用废气中氧气 再生峰值温度控制以保护下游催化剂– – 精密烟灰负载控制 再生期间氧气控制500DPF – 入口 温度Temp (C)400300发动机出口温度200 Burner In 100 Filter In0 0 200 400 600 800 1000 1200 1400 1600SecondsCopyright © Tenneco Inc. This document and the information embodied herein is the property of Tenneco Inc. and is disclosed in confidence for informational purposes only. It may not be copied, disclosed or used for any purpose without the prior written consent of Tenneco Inc..燃烧器系统组成部分ƒ 配备燃烧室的外壳– 理想状态下为双室ƒ ƒ ƒ ƒ燃油供应 空气泵 喷射 点燃系统– 火花塞和线圈 – 电热塞点火器1 点火器2ƒ 火焰稳定性控制– 热电偶 – 离子感测ƒ 传感器 ƒ 控制器燃烧器出口SmartFire 控制器 离子感测线圈燃烧器 入口 模拟& CAN 输入输出Copyright © Tenneco Inc. This document and the information embodied herein is the property of Tenneco Inc. and is disclosed in confidence for informational purposes only. It may not be copied, disclosed or used for any purpose without the prior written consent of Tenneco Inc..燃烧室设计二次燃烧区 混合区ƒ 一次燃烧区火焰稳定 ƒ 来自废气的氧气用在二次燃烧区Copyright © Tenneco Inc. This document and the information embodied herein is the property of Tenneco Inc. and is disclosed in confidence for informational purposes only. It may not be copied, disclosed or used for any purpose without the prior written consent of Tenneco Inc..空气泵选型ƒ 全尺寸燃烧器要求采用空气泵 ƒ 各种工作原理– 正排量(罗茨、涡卷、摆线、螺 杆、旋转等) – 差速泵(轴流、离心)ƒ 动力供应– 电动机(最大800W@12v) – 液压马达和离合器 – 皮带传动和离合器1,8ƒ ƒ ƒ ƒ对应背压的高流量@最低功耗 动态空气流量控制 达成高耐用性目标 占用空间和重量1,72 KW1,6PRESSURE RATIO1.5 KW1,51,41.0 KW1,31,20.5 KW1,11 0 2 4 6 8 10 12 14 16 18 20MASS FLOW RATE (G/S)Copyright © Tenneco Inc. This document and the information embodied herein is the property of Tenneco Inc. and is disclosed in confidence for informational purposes only. It may not be copied, disclosed or used for any purpose without the prior written consent of Tenneco Inc..离子感测型火焰稳定性控制0,4 sec Î 在火焰熄灭检测之后,只需400ms即可重新点燃火焰Copyright © Tenneco Inc. This document and the information embodied herein is the property of Tenneco Inc. and is disclosed in confidence for informational purposes only. It may not be copied, disclosed or used for any purpose without the prior written consent of Tenneco Inc..总结ƒ 要实现高效颗粒物减除目标就要使用壁流式过滤器 ƒ 连续再生捕捉器(CRT)- 是成本最低的DPF再生技术, 但在低温运行时可能导致灾难,并且易受硫的影响 ƒ 催化燃烧器包含了二次HC供应(蒸发器或喷射器)并且 要求进行DOC活化(>270°C) ƒ 催化燃烧器包括了DOC并因此易受硫影响 ƒ 全尺寸点火燃烧器能够在所有运行条件下提供可靠的DPF 再生 ƒ 全尺寸点火燃烧器对于采用高硫份燃油的市场是一种较好 的解决方案 ƒ 全尺寸点火燃烧器不会增加NO2排放量 ƒ 可根据不同应用进行单独尺寸缩放Copyright © Tenneco Inc. This document and the information embodied herein is the property of Tenneco Inc. and is disclosed in confidence for informational purposes only. It may not be copied, disclosed or used for any purpose without the prior written consent of Tenneco Inc..。

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