摘要:
An internal combustion engine in which a main SOx trap catalyst able to trap SOx contained in exhaust gas is arranged in an engine exhaust passage, and the exhaust passage downstream of the main SOx trap catalyst is divided into a main exhaust passage and a bypass passage bypassing the main exhaust passage. An NOx storage catalyst is arranged in the main exhaust passage, and an auxiliary SOx trap catalyst is arranged in the main exhaust passage upstream of the NOx storage catalyst. Normally, the exhaust gas is made to flow in the main exhaust passage. When regenerating the main SOx trap catalyst, the exhaust gas is made to flow through the bypass passage.
摘要:
A system and method for regenerating a device in an engine exhaust after-treatment system is provided. To regenerate the device, a syngas stream is introduced into the engine exhaust stream and combusts in the presence of a catalyst in the after-treatment system, raising the temperature. A supplemental liquid fuel stream is then selectively introduced into and is vaporized by the syngas stream to form a combined fuel stream. Combustion of the combined fuel stream with the engine exhaust in the presence of the catalyst further heats the device bringing it to a temperature suitable for regeneration. The catalyst can be upstream of or within the device being regenerated.
摘要:
Methods and systems are provided for operating an engine including an exhaust treatment system coupled to an engine exhaust, the exhaust treatment system further coupled to an engine intake via an exhaust gas recirculation (EGR) system. One example method comprises, operating in a first mode including routing exhaust gas through the exhaust treatment system to an exhaust tailpipe; operating in a second mode including routing exhaust gas through the exhaust treatment system to an engine intake via the EGR system, and operating in a third mode including routing exhaust gas to an engine intake through the EGR system while bypassing the exhaust treatment system.
摘要:
A process for operating a marine engine (1) in combination with a catalytic partial oxidation reformer (2) and, optionally, an exhaust gas aftertreater (3), wherein: (a) a mixture of a first fuel and air, is introduced in the combustion chamber of the engine (1); (b) exhaust gas is discharged from the engine and optionally partly recirculated to the combustion chamber of the engine (1); (c) a second fuel and oxygen and/or steam are supplied to the catalytic partial oxidation reformer (2) to produce synthesis gas, wherein the second fuel comprises Fischer-Tropsch derived fuel; (d) at least part of the synthesis gas is supplied to: (i) the exhaust gas aftertreater (3); (ii) the combustion chamber of the engine (1); or to both.
摘要:
A catalyst system that may regenerate while removing pollutants from an exhaust gas of an engine. The system may have a converter with multiple segments of chambers. At least one of the chambers may be regenerated while the remaining chambers are removing pollutants from the exhaust. The chambers may be rotated in turn for one-at-a-time regeneration. More than one chamber may be regenerated at a time to remove collected pollutants. The system may have plumbing and valves, and possibly mechanical movement of the chambers, within the system to effect the changing of a chamber for regeneration. The chambers connected to the exhaust may be in series or parallel. A particulate matter filter may be connected to the system, and it also may be regenerated to remove collected matter.
摘要:
A reducing agent addition valve is arranged in a position in which at least part of a reducing agent added to an exhaust gas in an exhaust passage at a location upstream of a precatalyst reaches the precatalyst in the state of liquid, and the reducing agent is supplied in a more suitable state to an exhaust gas purification device which is arranged in the exhaust passage at a downstream side of the precatalyst. When the addition of the reducing agent is performed by the reducing agent addition valve, the flow rate of the exhaust gas flowing into the precatalyst is decreased so that at least part of the reducing agent, which has reached the precatalyst and has vaporized in the precatalyst, is caused to flow back.
摘要:
A power output system that provides power to a driveshaft is provided which includes an internal combustion engine, an electric motoring mechanism, an electric storage device, a first exhaust gas channel that guides exhaust gas from the engine directly to an exhaust gas purifying catalyst, a second exhaust gas channel which guides the exhaust gas from the engine to the exhaust gas purifying catalyst via an unburned-component adsorber, a channel switching mechanism operable to switch a channel of the exhaust gas from the engine between the first exhaust gas channel and the second exhaust gas channel, a pressure accumulator operable to accumulate therein a negative pressure produced through rotation of the engine, a negative-pressure introducing/releasing mechanism that selectively permits and inhibits introduction of the negative pressure from the pressure accumulator into the channel switching mechanism, and a controller that controls the electric motoring mechanism and the negative-pressure introducing/releasing mechanism.
摘要:
An object of the present invention, in an internal combustion engine equipped with a moisture adsorbent and a NOx adsorbent in series in order from the upstream side of an exhaust passage, is to provide an exhaust gas purifying apparatus for the internal combustion engine which can successfully prevent an adsorption capability of NOx from being inhibited by moisture and is capable of maintaining the NOx adsorption capability of the NOx adsorbent adequately. A main exhaust passage 14 through which exhaust gas exhausted from an internal combustion engine 10 flows is provided. A bypass passage 20 bypassing the main exhaust passage 14 is provided. A moisture adsorbent 24 and a NOx adsorbent 28 are provided in the bypass passage 20 in series in order from a side closer to the upstream connecting portion 20a. A switching valve 22 is controlled to prevent the exhaust gas from flowing into the NOx adsorbent 28 when it is judged that the desorption of the moisture from the moisture adsorbent 24 is started.
摘要:
The control device of the internal combustion engine appropriately controls plural exhaust valves to effectively perform sulfur poisoning recovery in an exhaust gas purifying catalyst. The control device controls the internal combustion engine which performs lean burn. The exhaust system of the internal combustion engine includes: first exhaust valves and second exhaust valves provided in each of the plural cylinders; a first exhaust passage communicating with the first exhaust valves; a second exhaust passage communicating with the second exhaust valves; a first exhaust gas purifying catalyst provided at least one of the first exhaust passage and the second exhaust passage; and a second exhaust gas purifying catalyst provided on an exhaust passage downstream of a junction of the first exhaust passage and the second exhaust passage. The control means controls the exhaust valves such that an effect of rich combustion occurs more to the second exhaust gas purifying catalyst than to the first exhaust gas purifying catalyst, when performing rich combustion. By this, the consumption of the exhaust gas in the first exhaust gas purifying catalyst can be suppressed, and the temperature of the second exhaust gas purifying catalyst can be effectively risen. Therefore, the sulfur poisoning recovery and the like can be effectively performed.
摘要:
In an exhaust gas purification apparatus for an internal combustion engine (1) equipped with independent exhaust passages (2a, 2b) provided one for each cylinder group (1a, 1b) with a catalyst (3a, 3b) having a NOx trapping ability being arranged in each exhaust passage, the present invention is intended to provide a technique that can independently control the flow rates of exhaust gases flowing into the respective catalysts. To this end, the exhaust gas purification apparatus according to the present invention provides a communication passage (4) connecting mutually portions of said exhaust passages (2a, 2b) at upstream of said catalysts (3a, 3b), an upstream side switching valve (5) openning and closing said upstream side communication passage (4), a plurality of flow rate regulation valves (6a, 6b) being arranged at downstream of connecting portions of said exhaust passages with said upstream side communication passage, respectively, and a control section (9) controlling said upstream side switching valve (5) and said respective flow rate regulation valves (6a, 6b) in accordance with the states of said respective catalysts (3a, 3b). When the NOx trapping ability of one of the plurality of catalysts (3a, 3b) is regenerated, the control section (9) opens the upstream side switching valve (5), fully closes one flow rate regulation valve (6a, 6b) in one of the exhaust passages (2a, 2b) in which the one catalyst (3a, 3b) is arranged, and operates a reducing agent addition valve (7a, 7b) in such a manner that the reducing agent arrives at the one catalyst (3a, 3b) when the actual degree of opening of the one flow rate regulation valve (6a, 6b) becomes fully closed.