36 results about "Diesel Exhaust Particulate" patented technology

A structure for use in high temperature applications and including a porous ceramic material consisting essentially of about 50-90 percent by weight iron or magnesium stabilized aluminum titanate (AlTiO5) and about 10-50 percent by weight strontium feldspar (SrO.Al2O3.2SiO2), and having a coefficient of thermal expansion over a temperature range from room temperature to 1000° C. of about -10x10-7/° C. to +15x10-7/° C., a heat capacity at 500° C. greater than 3.2 J/cm3K, a porosity of about 15-50 percent by volume, preferably 40-50 percent by volume, and a median pore size of about 5-50 micrometers, preferably 8-15 micrometers. The structure is especially useful as a diesel exhaust particulate filter.

A ceramic filter for trapping and combusting diesel exhaust particulates composed of an end-plugged cordierite honeycomb structure exhibiting a pore size distribution as determined by mercury porosimetry in which the quantity d₅₀/(d₅₀+d₉₀) as related to pore size distribution is less than 0.70, a soot loaded permeability factor S_f, as defined by the equation [d₅₀/(d₅₀+d₉₀)]/[% porosity/100], of less than 1.55, and, a coefficient of thermal expansion (25–800° C.) of no greater than 17×10⁻⁷/° C. The ceramic filter further exhibits a median pore diameter, d₅₀, of at least 4 micrometers and up to 40 micrometers. A method of making the filter is provided.

A self-cleaning diesel exhaust particulate filter system is disclosed wherein burn-off of collected particulate matter is accomplished at normal exhaust gas temperatures, the filter system being provided with a catalyst mixture of a co-formed ceria-zirconia composite and, optionally, a base metal oxide, the presence of which allows regeneration of filters at temperatures that are readily achieved in diesel exhaust systems, including operating conditions that are at low load where lower exhaust temperatures exist.

A method to fabricate thin, penetrating coatings of metal oxides with oxygen storage capability is disclosed. The application of these coating in diesel exhaust particulate oxidation, carbonization prevention in ethylene cracking pipes etc. is also disclosed. In this method, the use of thin, penetrating coatings of catalytic metals decreases the oxidation temperature of carbon in contact with or near the coated surfaces. Finally, the invention describes a method to prepare a better bonding surface for laying down catalysts through traditional calcification slurry methods, by pre-coating the surface with a thin, penetrating coating of metal oxide.

An apparatus and method for cleaning ash/soot and other particulates from diesel particulate filters (DPF), including diesel oxidative catalysts (DOC) and similar exhaust components. Section for dry and wet cleaning include conduits that connect to the filters. For dry cleaning, a filter is mounted clean side up and air pressure is applied in opposite directions so that the particulate is dislodged and falls out. For wet cleaning, the filter is floated with a slug of liquid cleaning solution which is surged back-and-forth through the filter to dislodge and remove the particulate. The dry and wet cleaning sections may be combined or collocated, or may be located separately or used one without the other.

A device for cleaning vehicle exhaust gas, especially a filter for diesel exhaust particulates or a catalytic converter, comprises a filter body including a plurality of individual cuboid bodies through which gas flows. The filter body has, at least in sections, an angular outer contour, as seen in a main direction of flow. The filter body also has an unmachined outer surface at the angular outer contour.

The invention relates to a wire mesh type diesel exhaust particulate filter and a production method thereof, and belongs to the technical field of air purification. The wire mesh type diesel exhaust particulate filter comprises a stainless steel barrel, a pin playing a role in fixation and a plurality of layers of interwoven and intertwined stainless steel wire meshes located in the stainless steel barrel, and each stainless steel wire mesh is coated with a catalyst coating. Wavy wire meshes and plain meshes are combined and intertwined differently, so that weight and back pressure of the particulate filter an be reduced effectively; filtration efficiency and back pressure can be regulated by different combining and intertwining modes; complexity of the section of the particulate filter can be ensured by the angle of the wavy meshes, particulate interception effect is better, and filtration efficiency is improved; by the catalyst coatings, temperature of soot particulate regeneration can be reduced effectively, necessary NO2 gas for regeneration is provided, and continuous passive particulate regeneration of the filter is realized.

The invention relates to a method for preparing silicon-boron-carbon-nitrogen porous ceramic with a nano pore structure. The method comprises the following steps: uniformly mixing boron trichloride, aniline and simethicone according to a ratio of 1:1:2.5, and heating to react to prepare an organic precursor; then dipping nano polyacrylonitrile fibers in the organic precursor and performing heat preservation at a certain temperature; finally sintering the mixture in a high-purity nitrogen atmosphere, and cooling the mixture to room temperature with the furnace after the heat preservation is finished, wherein after the high temperature nitrogen treatment, the nano polyacrylonitrile fibers are corroded to form silicon-boron-carbon-nitrogen (Si-B-C-N) porous ceramic with the nano pore structure. The aperture of the obtained silicon-boron-carbon-nitrogen (Si-B-C-N) porous ceramic is 150-300 nm, the porosity is up to 78-90%, the silicon-boron-carbon-nitrogen (Si-B-C-N) porous ceramic is high temperature resistant, oxidation resistant, free of obvious oxidation at 950 DEG C in an air atmosphere, and free of obvious loss of mechanical property at 1100 DEG C. The silicon-boron-carbon-nitrogen (Si-B-C-N) porous ceramic can be applied to a diesel exhaust particulate filter (DPF) carrier.

The invention discloses a mixed aerosol generating device simulating diesel exhaust particulate flow. A dissolved organic matter generating device is arranged based on a carbon black aerosol generating device, and an ash aerosol generating device has three sections, namely the mixed solution generating section, the mixed solution evaporating section and the ash aerosol dilution and deposition section; in the mixed solution generating section, an ash containing cup, a distilled water containing cup and a mixed solution containing cup are connected, and an outlet of a mixed solution stirrer is connected with a mixed solution filter net, a hopper, a filtered solution containing cup, a filtered solution stirrer, a stirrer valve, an ejector T-joint and a solution ejector in sequence; in the mixed solution evaporating section, the ejector T-joint is connected to the solution ejector, and the solution ejector is connected with a mixing pipe, a heating wire pipe and a heating wire pipe T-joint in sequence; in the ash aerosol dilution and deposition section, the heating wire pipe T-joint is connected with an air filter, a second float flowmeter and one inlet of a dilution section T-joint in sequence. The mixed aerosol generating device is simple in structure, and mixed aerosol generating concentration is controlled in multiple regulating ways so as to better simulate diesel exhaust particulate flow.

The invention relates to a diesel particulate filter provided with three-way catalytic coatings, and relates to a diesel particulate filter used for a diesel exhaust system. The diesel particulate filter comprises a plurality of filter flow channels which are used for removing diesel exhaust particulates from diesel exhaust flow, wherein the plurality of filter flow channels are contacted with the diesel exhaust flow and coated with the three-way catalytic coatings; and the three-way catalytic coatings can be configured to promote soot oxidation during occurrence of a regeneration event, and promotes reduction of NOx in the exhaust flow simultaneously. The three-way catalytic coatings can be used as replacement or supplementation of a three-way catalyst of a diesel oxidation catalyst.

The invention discloses a particle collection and regeneration system for a mine-used explosion-proof diesel engine, comprising a trap installed at the exhaust end of the explosion-proof diesel engine for processing the exhaust gas of the diesel engine, and a trap installed on the ground for regenerating the trap The regeneration device, the trap includes a DOC that is installed on the exhaust manifold of the mine explosion-proof diesel engine to convert CO and HC in the engine exhaust into harmless water and carbon dioxide through an oxidation reaction, and is equipped with a filter element inside for DPF for filtering exhaust gas and reducing PM content in exhaust gas. The DPF is fixedly connected to the exhaust end of the DOC through a clamp, and the outlet end of the DPF is connected to the exhaust pipe. The invention can safely and effectively realize the particle trapping work of the exhaust gas of the explosion-proof diesel engine, and can effectively reduce the content of CO, HC and PM in the exhaust pollutants.

A method and device for testing a diesel engine to determine whether the engine's diesel particulate filter is functioning properly is provided. The device comprises an elongated pole with a service ring disposed at one end. The service ring is designed to removably support a filtration means, which is composed of porous cloth material. The device is removably affixed over the outlet of a diesel engine exhaust pipe, allowing the filtration means to trap any particulates that may be contained within the engine exhaust. If the diesel engine particulate filter is functioning properly, there will be no particulates collected by the filtration means; if the diesel engine particulate filter is not functioning properly, the present invention allows the user to collect physical evidence of such.