摘要:
In the method and arrangement for preventing clogging of a component (7) that is part of the exhaust system of an internal combustion engine and exposed to exhaust gases from the engine (1), the exhaust gas flow direction through the component (7) is periodically reversed.
摘要:
A process for treating an exhaust gas of a lean-bum reciprocating internal combustion engine comprising the steps of collecting particulate matter (PM) on a first filter (26) and combusting a carbon fraction thereof, periodically reversing the direction of gas flow through the first filter (20) thereby displacing uncombusted PM from the erstwhile upstream side thereof and collecting at least part of the displaced PM on a second filter (34).
摘要:
An apparatus and method for filtering particulate from an internal combustion engine by use of monolithic particulate trap systems having porous walls (2c, 24c). The porous walls (2c, 24c) filter the particulate. The filtered particulate on inner surfaces of the porous walls is periodically removed or regenerated via back flow of previously filtered exhaust gas. The back flow is caused by creating a pressure difference across the porous walls. The back flow of the previously filtered exhaust gas is simultaneously or sequentially coupled with high velocity through flow of exhaust gas in the channels. In addition, the particulate trap system can be an adsorber-catalyst particulate trap system for filtering particulate and reducing NOx via an adsorber-catalyst trap systems to achieve the EPA 2007 standards.
摘要:
An exhaust after-treatment system including at least one exhaust treatment component (18); and a particulate matter dispersion device (40) located upstream of the exhaust treatment component (18). The particulate matter dispersion device (40) includes at least one nozzle line (61) having a plurality of nozzles (58) formed therein, and the particulate matter dispersion device (40) is operable to inject compressed gas towards the exhaust treatment component (18) to substantially minimize build-up of particulate matter at the exhaust treatment component (18).
摘要:
サプライモジュールやその周辺の尿素水経路を閉塞する原因となる異物を除去して尿素水経路の閉塞を解消又は未然に防止し、同時にドライバの負担を軽減することができる異物除去方法及び選択還元触媒システムを提供する。 尿素水を選択還元触媒103に供給して排気ガス中のNO X を浄化する選択還元触媒システム100における尿素水経路の閉塞を解消又は未然に防止すべく、尿素水経路における尿素水圧力を変動させ、閉塞の原因となる異物を除去する異物除去方法である。
摘要:
A compact reversing flow catalytic converter with protection from overheating includes a valve unit which directs exhaust gases through a container filled with catalytic material to permit a bypass of catalytic material when a temperature of the material exceeds a predetermined threshold. The container defines a U-shaped gas passage that communicates with two parts at the top of the container. The valve unit is mounted to the top of the container and includes an intake and an exhaust cavity. The valve unit includes a valve disk having two openings therethrough. The valve disk rotates around perpendicular central axis between a first, a second and third positions. When overheating of the catalytic material is predicted, a controller relinquishes control of the valve disk and a center return mechanism rotates the valve disk to a third position, in which each of the openings communicates with both ports so that the exhaust gas flow bypasses catalytic material. The catalytic material is thus protected from damage due to overhearing. The advantage is a compact, reliable, highly efficient catalytic converter that is inexpensive to manufacture, durable, and adapted for extended service life. An alternate version of the compact reversing flow controller is also described wherein the valve unit and container are essentially as described above but the valve disk is a four position disk with the fourth position blocking communication between the valve housing and the container isolating the monolith so that maximum heat is retained during engine shut down. The valve is driven by a stepper motor that moves and holds the valve to its four positions including block, bypass, forward and reverse flow. The alternate version also replaces the oxidizing flow-through monolith with an oxidizing filter trap and adds a fuel injection system under control of the controller so that measured amounts of fuel can be injected into the valve inlet to enhance oxidation.
摘要:
The invention relates to an exhaust gas cleaning system and to a method for cleaning exhaust gas from an internal combustion engine. Said system comprises an exhaust gas aftertreatment unit and an adjustable flow divider (34; 44) is provided. In a position for regenerating the exhaust gas aftertreatment unit, said flow divider enables a first partial flow of the exhaust gas to be produced and to pass through the exhaust gas aftertreatment unit (14), while a remaining, second partial flow passes through at least one other exhaust gas aftertreatment unit (12, 14, 32).
摘要:
A purification system and a method for controlling exhaust gas emissions from internal combustion engines during start-up and restart, as well as during normal engine operation, are disclosed. A method for controlling emissions during low load operation of a diesel engine fueled with a diesel fuel/methane mixture is also provided. Exhaust gases are contacted with a gas permeable solid material (5) containing an adsorbent (11) and a catalyst (10) capable of converting the noxious components into innocuous materials. The flow of the gases through the gas permeable solid material is reversed in a series of continuing cycles to bring or to maintain the catalyst in a temperature range suitable for controlling the noxious components, below which temperature the noxious materials are adsorbed by the adsorbent.
摘要:
An exhaust treatment packaging apparatus, system, and method includes an elongate exhaust gas passage (502) comprising an inlet (502a) for the entrance of flowing exhaust gases and an outlet (502b) for the exit of the gases. A catalytic device (514) comprising an inlet (504a) and an outlet (504b) completely or partially overlaps the passage (502) to reduce the length required for the system. The passage outlet (502b) is disposed adjacent the catalytic device inlet (504a), and a flow connector (524) connects the passage outlet (502b) to the catalytic device inlet (504a). A particulate filter (716) or other treatment device may be substituted for or added to the catalytic device (514). A doser (510) disposed upstream of the passage (502) doses an additive which evaporates, mixes, or otherwise undergoes change in the passage (502) before reaching the catalytic device (514).