摘要:
This disclosure provides a selective catalytic reduction (SCR) system (11) configured to optimise its NOx conversion efficiency. The SCR system (11) comprises a reductant injector (43) for injecting reductant fluid into the exhaust gas, the reductant fluid comprising or being capable of forming ammonia. An SCR catalyst (44) is located downstream of the reductant injector (43) and a heat transfer arrangement (45) is located at or upstream of the SCR catalyst (44). A controller is configured to operate the heat transfer arrangement (45) to maintain the temperature (80) of the SCR catalyst (44) at or below a predetermined upper temperature (88). The predetermined upper temperature (88) is selected based upon the temperature (80) of the SCR catalyst (44) required to maintain the amount of ammonia adsorbed by the SCR catalyst (44) above an ammonia coverage lower limit.
摘要:
An arrangement for providing an aftertreatment device housing with air comprises a combustion air intake (100) disposed receive combustion air for combustion in an internal combustion engine (118); a first supercharger (104) disposed to receive combustion air from the combustion air intake (100); a first conduit (106) disposed to receive the combustion air compressed in the first supercharger (104); a second conduit (110) coupled to the first conduit (106) to receive a first portion of the combustion air compressed in the first supercharger (104) from the first conduit (106); and a third conduit (112) coupled to the first conduit (106) to receive a second portion of the combustion air compressed in the first supercharger (104), wherein the third conduit (112) is configured to convey the second portion into the aftertreatment device housing (113) which substantially surrounds an aftertreatment device (114).
摘要:
A catalytic converter apparatus comprises: a catalytic converter 2; a flow path for directing exhaust gas 10 through the catalytic converter 2; a cavity 20 for housing the catalytic converter 2; and a cooling apparatus for cooling at least a part of an inner surface 28 of the cavity 20; wherein when the catalytic converter 2 is housed within the cavity 20 a gap 26 is formed between the inner surface 28 of the cavity and an outer surface 32 of the catalytic converter 2 with the gap 26 extending around a major portion of the outer surface 32 of the catalytic converter 2.
摘要:
The invention relates to a device (1) for treating an exhaust gas (3) of an internal combustion engine (4) that flows through an exhaust line (2), comprising at least one dosing unit (5) that is arranged in an opening (6) of an exhaust pipe (7) of the exhaust line (2) and is configured to add an exhaust treatment agent (8) into the exhaust line (2), wherein the dosing unit (5) is enclosed by a cooling sheath (9), by means of which the dosing unit (5) is fastened in the opening (6) of the exhaust pipe (7), wherein the cooling sheath (9) is at least partially enclosed by a chamber (10) that is delimited at least by the cooling sheath (9), the exhaust pipe (7), and a cover plate (11), wherein the cover plate (11) is connected to the exhaust pipe (7) and spaced apart from the cooling sheath (9) or the dosing unit (5) by a gap (12).
摘要:
The present invention provides a vehicular exhaust gas purification apparatus and vehicular exhaust gas purification method, using a disperser (7) for dispersing the exhaust gas from a vehicle into small bubbles and channelling the bubbles into a reaction chamber (8) containing alkaline, so that a chemical reaction can take place between the acidic gases in the exhaust gas and the alkaline solution, and simultaneously enable the suspended particles in the exhaust gas to be dissolved in the solution, thereby providing purification by substantially lessening the amount of harmful substances in the exhaust gas.
摘要:
An assembly and method for reducing nitrogen oxides, carbon monoxide and hydrocarbons in exhausts of internal combustion engines, wherein the exhaust is acted upon in a first stage catalytic converter. A first portion of the first stage catalytic converter output is cooled and a second portion of the catalytic converter output is not cooled. The cooled and not cooled exhausts are united and directed to a second stage catalytic converter. Air is injected into a selected one of (1) the not cooled exhaust prior to the juncture thereof with the cooled exhaust, and (2) the combined cooled and not cooled exhausts after the juncture thereof.