Configuration for decomposing nitrogen oxides in a gas stream and method for using the configuration
    6.
    发明授权
    Configuration for decomposing nitrogen oxides in a gas stream and method for using the configuration 有权
    在气流中分解氮氧化物的配置和使用该配置的方法

    公开(公告)号:US06475453B1

    公开(公告)日:2002-11-05

    申请号:US09133004

    申请日:1998-08-12

    IPC分类号: B01J2104

    摘要: A configuration for decomposing nitrogen oxides in a gas stream includes a plurality of catalytic converters disposed one after the other through which the gas stream can flow. Each of the catalytic converters has a honeycomb structure with many parallel cells through which the gas stream can flow. Each of the catalytic converters also has a predetermined cell density and a predetermined average level of activity defined as a proportion by weight of the catalytically active agent. The predetermined cell density of a second catalytic converter through which the gas stream flows after a first catalytic converter is lower than the predetermined cell density of the first catalytic converter. The predetermined average level of activity of the second catalytic converter is also higher than the predetermined average level of activity of the first catalytic converter. The configuration is preferably used in conjunction with an exhaust gas from a combustion drive unit.

    摘要翻译: 用于分解气流中的氮氧化物的构造包括多个催化转化器,其一个接一个地设置,气流可以流过。 每个催化转化器具有蜂窝结构,其具有许多平行的气室,气流可以流过该蜂窝结构。 每个催化转化器还具有预定的细胞密度和预定的平均活性水平,定义为催化活性剂的重量比例。 气体流在第一催化转化器之后流过的第二催化转化器的预定电池密度低于第一催化转化器的预定电池密度。 第二催化转化器的预定平均活性水平也高于第一催化转化器的预定平均活性水平。 该结构优选与来自燃烧驱动单元的废气结合使用。

    Metering system
    8.
    发明授权
    Metering system 有权
    计量系统

    公开(公告)号:US06539708B1

    公开(公告)日:2003-04-01

    申请号:US09640152

    申请日:2000-08-16

    IPC分类号: F01N300

    摘要: A metering system in a combustion unit having an exhaust-gas chamber and a reducing agent reservoir includes an electrically controllable valve for introducing the reducing agent into the exhaust-gas chamber without using compressed air. The valve has an outlet opening that opens directly into the exhaust-gas chamber. The outlet opening is fluidically connected to the reservoir through the valve. The metering system can be produced with only little technical outlay. The metering system includes a recirculating circuit, and the valve has a holding chamber for the reducing agent. The holding chamber is disposed downstream of the outlet opening in a reducing agent flow direction, and is fluidically connected into the recirculating circuit. The metering system includes a coolant circuit for cooling the valve. The valve and its outlet opening is disposed in the exhaust-gas chamber to position the principal axis of the valve at an angle of less than 90° with respect to a principal direction of flow of exhaust gas in the exhaust-gas chamber. The metering system includes a baffle disposed in the exhaust-gas chamber to cause a change in direction of reducing agent introduced therein. The combustion unit can be a diesel engine, and the reducing agent can be a urea solution.

    摘要翻译: 在具有废气室和还原剂储存器的燃烧单元中的计量系统包括用于将还原剂引入排气室而不使用压缩空气的电可控阀。 该阀具有直接进入废气室的出口。 出口开口通过阀流体连接到储存器。 计量系统只能用很少的技术支出生产。 计量系统包括循环回路,并且该阀具有用于还原剂的保持室。 保持室以还原剂流动方向设置在出口开口的下游,并且流体连接到再循环回路中。 计量系统包括用于冷却阀的冷却剂回路。 阀及其出口开口设置在废气室中,以相对于废气室中废气流动的主要方向将阀的主轴定位成小于90°的角度。 计量系统包括设置在废气室中的挡板,以引起其中引入的还原剂的方向改变。 燃烧单元可以是柴油发动机,还原剂可以是尿素溶液。

    Method for cleaning diesel engine exhaust gas
    9.
    发明授权
    Method for cleaning diesel engine exhaust gas 失效
    清洁柴油机废气的方法

    公开(公告)号:US06488903B2

    公开(公告)日:2002-12-03

    申请号:US09725340

    申请日:2000-11-29

    IPC分类号: C01G3000

    摘要: A method for cleaning diesel engine exhaust gas is described. The exhaust gas is passed over a catalytic converter with an active material which contains (% by weight) 70-95% TiO2, 2-10% WO3 and/or MoO3, 0.1-5% V2O5, 0.1-8% CaO, 0.1-8% Al2O3, 0.1-5% B2O3 and 0.1-10% SiO2. A reducing agent for a reduction of nitrogen oxides is metered into the exhaust-gas stream upstream of the catalytic converter.

    摘要翻译: 描述了一种用于清洁柴油发动机废气的方法。 废气通过含有(重量%)70-95%TiO 2,2-10%WO 3和/或MoO 3,0.1-5%V 2 O 5,0.1-8%CaO,0.1- 8%Al2O3,0.1-5%B2O3和0.1-10%SiO2。 将用于还原氮氧化物的还原剂计量到催化转化器上游的排气流中。