摘要:
An exhaust gas purifying apparatus for internal combustion engine that in the supply of ozone to exhaust gas, attains efficient use of ozone. A NOx occlusion reduction catalyst is disposed along an exhaust passageway of internal combustion engine. A NOx oxidation gas supply unit is provided for supply of air or ozone (O3) to be mixed with an exhaust gas flowing in the NOx occlusion reduction catalyst. When the temperature of the NOx occlusion reduction catalyst is below the temperature at which an effect of NOx occlusion acceleration by air supply is exerted, ozone is supplied. On the other hand, when the temperature of the NOx occlusion reduction catalyst is not lower than the temperature at which an effect of NOx occlusion acceleration by air supply is exerted, ozone supply is discontinued and air supply is carried out.
摘要:
An exhaust gas purification system provided with a trapping device (6) arranged on an engine exhaust passage and trapping particulate matter in the exhaust gas, an ozone generator (21) for generating ozone, and an ozone adsorbent (22) able to adsorb ozone, wherein at least part of the ozone generated by said ozone generator is adsorbed by said ozone adsorbent and, when particulate matter trapped on said trapping device should be removed, ozone adsorbed on the ozone adsorbent is desorbed from the ozone adsorbent and supplied to the trapping device. Due to this, it is possible to use an ozone generator with a relatively low ozone generating ability to burn off PM trapped on a filter etc. efficiently.
摘要:
An exhaust gas purifying apparatus provided in an exhaust passage (60) connected with an engine (50) includes an upstream catalyst (20) that is provided in the exhaust passage (60), and that removes NOx; a downstream catalyst (30) that is provided downstream of the upstream catalyst (20) in the exhaust passage (60); and supply means (40) for supplying an oxygen-activating component to a portion of the exhaust passage (60) located between the upstream catalyst (20) and the downstream catalyst (30). In the exhaust gas purifying apparatus, the upstream catalyst (20) removes NOx, and then an oxygen-activating component is supplied to the exhaust gas. Further, the downstream catalyst (30) removes a hydrocarbon compound contained in the exhaust gas.
摘要:
One object of the present invention is to provide an exhaust emission control apparatus for an internal combustion engine that is capable of improving the NOx purification performance. An exhaust emission control apparatus being placed in an exhaust path of an internal combustion engine, comprising: an NOx retention material; ozone injection means for injecting ozone into an exhaust gas being positioned upstream from the NOx retention material; an HC adsorbent adsorbing HC contained in the exhaust gas; and a catalyst being placed in a region where desorbed NOx and desorbed HC contact each other. The HC adsorbent is prepared so as to desorb adsorbed HC at the same time as NOx being stored in the NOx retention material is desorbed.
摘要:
An exhaust gas purifying apparatus provided in an exhaust passage (60) connected with an engine (50) includes an upstream catalyst (20) that is provided in the exhaust passage (60), and that removes NOx; a downstream catalyst (30) that is provided downstream of the upstream catalyst (20) in the exhaust passage (60); and supply means (40) for supplying an oxygen-activating component to a portion of the exhaust passage (60) located between the upstream catalyst (20) and the downstream catalyst (30). In the exhaust gas purifying apparatus, the upstream catalyst (20) removes NOx, and then an oxygen-activating component is supplied to the exhaust gas. Further, the downstream catalyst (30) removes a hydrocarbon compound contained in the exhaust gas.
摘要:
An object of the present invention is to provide an exhaust emission control apparatus that is used with an internal combustion engine to permit efficient use of ozone when ozone is added to an exhaust gas. A NOx occlusion reduction type catalyst is positioned in an exhaust path of the internal combustion engine. A NOx oxidation gas supply device is provided, and the NOx oxidation gas supply device supplies air or ozone (O 3 ) so that air or ozone (O 3 ) mixes with an exhaust gas flowing into the NOx occlusion reduction type catalyst. The ozone supply is performed when the temperature of the NOx occlusion reduction type catalyst is lower than a temperature at which a NOx occlusion acceleration effect is produced by the air supply. After the temperature of the NOx occlusion reduction type catalyst reaches the temperature at which the NOx occlusion acceleration effect is produced by the air supply, the air supply is performed and the ozone supply is shut off.
摘要翻译:本发明的一个目的是提供一种与内燃机一起使用的废气排放控制装置,以便当臭氧被添加到废气时允许有效使用臭氧。 NOx吸收降低型催化剂位于内燃机的排气路径中。 NO X氧化气体供给装置被设置,NO X氧化气体供给装置供给空气或臭氧(O 3),使得空气或臭氧(O 3)与流入NO X吸藏还原型催化剂的废气混合。 当NOx吸留还原型催化剂的温度低于通过空气供应产生NOx吸收加速效应的温度时,进行臭氧供应。 在NOx吸留还原型催化剂的温度达到由供气产生NOx吸收促进效果的温度之后,执行供气并关闭臭氧供应。
摘要:
The device for cleaning exhaust gas of the internal combustion engine includes means provided in an exhaust gas passage (15) of the internal combustion engine (10), such as a NOx catalyst (20), a SOx trap catalyst (30) provided at a position upstream from the exhaust gas cleaning means, and means (40, 41) for feeding ozone to a position upstream from the SOx trap catalyst. SOx in the exhaust gas is absorbed by the SOx trap catalyst before reaching the NOx catalyst. Particularly, it is possible to oxidize SOx in the exhaust gas by ozone as oxidizing gas to be an easily decomposable state, whereby SOx is absorbable even at a low temperature. Preferably, the SOx trap catalyst has no active points consisting of precious metal. In such a case, the SOx trap catalyst is prevented from being sulfur-poisoned whereby the deterioration of the SOx absorbing ability is avoidable.