摘要:
An internal combustion engine system having a non-catalyzed particulate filter receiving products of combustion at a temperature of frequently above 600° C. and an excess of oxygen of between 0.5 and 0.8% from a stoichiometric diesel engine. A NOx reduction catalyst is positioned downstream of the particulate filter. The engine system may include a turbocharger and the particulate filter and NOx reduction catalyst may be positioned either upstream of the turbine or downstream of the turbine or alternatively the particulate filter upstream of the turbine and the NOx reduction catalyst downstream of the turbine.
摘要:
A device for cleaning exhaust gas of an internal combustion engine according to the present invention includes a device (30) for collecting particulate matter from exhaust gas in an exhaust gas passage (15), ozone feeding device (40) capable of feeding ozone to the device (30) for collecting particulate matter from upstream thereof, and an NOx catalyst (20) disposed upstream from the ozone feeding device (40), for cleaning NOx in the exhaust gas. Since NOx is preliminarily removed by the NOx catalyst (20) at apposition upstream from the ozone feeding device (40), the consumption of ozone due to the reaction with NOx is prevented, whereby it is possible to effectively use ozone for the purpose of oxidizing and removing PM in the device (30) for collecting particulate matter.
摘要:
A system for NOx reduction in combustion gases, especially from diesel engines, incorporates an oxidation catalyst to convert at least a portion of NO to NO2, a particulate filter, a source of reductant such as NH3 and an SCR catalyst. Considerable improvements in NOx conversion are observed.
摘要:
The present invention provides an exhaust gas purifying apparatus 10 which can effectively purify an exhaust gas with the use of a plasma. The present exhaust gas purifying apparatus 10 comprises a NOx purifying catalyst 1 disposed in an exhaust gas pipe 11 for an internal combustion engine (ENG); a plasma generator 2 for converting a gas into a plasma and supplying the plasma to the exhaust pipe at the upstream of the NOx purifying catalyst; a switching device 3 for selectively supplying one of a recirculated exhaust gas 13 and air 12 as a gas to be converted into a plasma to the plasma generator 2; and an injector 4 for adding a reducing agent to the gas 14 to be converted into a plasma or a plasma 15 converted from the gas by the plasma generator. The present invention further provides a method for controlling the exhaust gas purifying apparatus.
摘要:
The present invention aims to eliminate the mounting of an independent ammonia oxidation catalyst to an exhaust passage. A selective reduction catalyst comprises a catalyst support 23 in which a plurality of through holes 23b partitioned by porous walls 23a are formed and a first active component 24 carried by the walls which dissolves nitrogen oxide contained in the exhaust gas by the reaction with ammonia. Inlet portions 23c and outlet portions 23d, adjacent to each other, of the plurality of through holes 23b are alternately sealed, and the wall 23a carrying the first active component 24 has ventilation and a second active component 26 having a catalytic action so as to oxidize ammonia having passed the wall is carried on the inner surface of the though hole. An exhaust gas purifier is provided with the selective reduction catalyst 22, a liquid injection nozzle 29 which is provided on the upstream side and can inject urea liquid 32, and an oxidation catalyst 53 provided at the exhaust pipe 16 on the upstream side.
摘要:
Disclosed is a fuel filter for removing sulfur containing compounds from an internal combustion fuel stream. In one embodiment, the fuel filter comprises at least one column comprising an adsorbent. In one exemplary embodiment the adsorbent is capable of removing sulfur containing compounds, especially sulfur containing aromatic compounds, from fuels used in internal combustion engines, especially diesel fuels. Also disclosed is an apparatus for extending the life cycle of a post combustion emission control device. In one exemplary embodiment, the apparatus comprises a fuel filter for removing sulfur containing compounds from an internal combustion fuel stream and an emission control device. Finally, a method for removing sulfur containing compounds from an internal combustion fuel stream is disclosed. In one exemplary embodiment, the method comprises passing a fuel through a fuel filter capable of removing sulfur containing compounds, storing the removed sulfur containing compounds, releasing a portion of the stored sulfur containing compounds, and sending the portion through the engine and into an emission control device.
摘要:
An exhaust system for an engine is disclosed. The exhaust system may have a NOx reducer located to receive exhaust from the engine, and a bypass circuit configured to selectively pass supercharged air to the NOx reducer. The exhaust system may also have a valve disposed within the bypass circuit to regulate the flow of supercharged air, and a controller in communication with the valve. The controller may be configured to move the valve to pass the supercharged air and cool the exhaust received by the NOx reducer. The controller may also be configured to move the valve to reduce the passing of the supercharged air and remove sulfur compounds from the NOx reducer.
摘要:
In a method for operating an exhaust-gas cleaning unit of a diesel engine including a particle filter and a nitrogen oxide storage device arranged upstream of the particle filter, wherein sulfur regeneration of the nitrogen oxide storage device is performed periodically at raised exhaust gas temperatures and, in certain phases, with a rich exhaust gas composition, and also soot regeneration of the particle filter is performed at raised exhaust gas temperatures with a lean exhaust gas composition, at least some of the sulfur regeneration and the soot regeneration phases are performed in a combined soot and sulfur regeneration phase, and for the sulfur regeneration, at least temporarily, a rich exhaust-gas composition with a temperature higher than the temperature of the lean exhaust gas composition is provided for the soot regeneration of the particle filter.
摘要:
A method of decreasing pollutants produced in a combustion process. The method comprises combusting coal in a combustion chamber to produce at least one pollutant selected from the group consisting of a nitrogen-containing pollutant, sulfuric acid, sulfur trioxide, carbonyl sulfide, carbon disulfide, chlorine, hydroiodic acid, iodine, hydrofluoric acid, fluorine, hydrobromic acid, bromine, phosphoric acid, phosphorous pentaoxide, elemental mercury, and mercuric chloride. Oil shale particles are introduced into the combustion chamber and are combusted to produce sorbent particulates and a reductant. The at least one pollutant is contacted with at least one of the sorbent particulates and the reductant to decrease an amount of the at least one pollutant in the combustion chamber. The reductant may chemically reduce the at least one pollutant to a benign species. The sorbent particulates may adsorb or absorb the at least one pollutant. A combustion chamber that produces decreased pollutants in a combustion process is also disclosed.
摘要:
NOx and SO3 emissions from combustion of a sulfur containing carbonaceous fuel are reduced simultaneously. The combustion gases comprising NOx and SO2 are mixed with a NOx control agent into the combustion gases at a point upstream of a selective catalytic reduction catalyst for reduction of NOx. Following an SCR catalyst or other equipment that can oxidize SO2 to SO3 and prior to contact with an air heater for heating incoming combustion air, magnesium hydroxide is introduced in amounts and with droplet sizes and concentrations effective to form nano-sized particles in the effluent and reduce SO3 caused by the oxidation of SO2 in the catalyst. Computational fluid dynamics is employed to determine flow rates and select reagent introduction rates, reagent introduction location(s), reagent concentration, reagent droplet size and/or reagent momentum.