36 results about "Diesel Exhaust Particulate" patented technology

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 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 Sf, 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 17x10-7 / ° 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 honeycomb ceramic filtration substrate, a filter made of the said substrate and a filter system made of the said filter and their production methods are published in the present invention. The said substrates are extruded with a paste comprising (by portion): SiC: 1; Clay: 0.05-0.5; Flour: 0.1-0.35; grease: 0.025-0.05; Water: 0.2-0.35. The said sintered substrate has a honeycomb structure with cells density ranging from 4˜62 cells / cm2; The cell wall thickness is: 0.2-1.2 mm; The porosity of the cell wall: 40-70%. The cell wall through pore rate is more than 30%; The average diameter distribution of the cell wall micro-pores is in the ranging of 1-50 μm. The said substrate can be designed in different cylinders whose cross section are in form of square, one border curved square and one border curved triangle etc., After adhering the substrates, the filter can be used as vehicle particulates filter. After the canning of the filter, the filter system is produced. The problem of particulates pollutant from the vehicles can be resolved via the present invention, and it is especially efficient to treat the diesel exhaust particulates which are harmful to the human health.

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.

A particulate converter for the collection and the incineration of particulate matters from diesel engine exhaust includes an exhaust path extending from the diesel engine through the particulate converter. The particulate converter further includes a housing and at least one candle located in the housing. An electrical incineration system may be electrically connected to a pulsed power supply forincinerating soot collected within the candle. A diesel oxidation catalyst (DOC) may be disposed in the exhaust path to generate sufficient amount of NO2 to assist in incineration. At least one exhaust cooling device may be provided for the control of exhaust temperature. A feedback control system may control exhaust gas temperatures based on pressure drop across the DPC, temperature ahead of theDPC and engine RPM.

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 relates to a method for sintering a wall-flow honeycomb ceramic carrier, which is mainly used for trapping diesel engine exhaust particles. The wall-flow honeycomb ceramic carrier body is put into a kiln and vacuumized. When the temperature of the kiln rises to the set Keep warm after the value, fill the kiln with protective gas for sintering, keep warm after sintering, continue to raise the furnace temperature and sinter to the set value, then keep warm, continue to raise the furnace temperature to the set value, keep warm, cool down, and come out of the furnace. Advantages: First, the combination of furnace heating and heat preservation not only ensures the sintering quality of the honeycomb green body, but also ensures the ceramic strength after sintering; second, the furnace adopts protective gas protection firing process, which not only meets the The melting temperature required for silicon carbide recrystallization can also keep the silicon carbide recrystallization in a molten state for heat preservation and smelting, and finally form a high-strength recrystallized silicon carbide honeycomb ceramic collector.

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.

The invention is a method for estimating the carbon load of a diesel engine exhaust particulate filter, comprising the following steps: 1) selecting a diesel engine steady-state working condition and determining the flow rate of exhaust gas passing through the diesel engine exhaust particulate filter under this working condition; 2) ) Determine the front and rear pressure drop corresponding to the exhaust flow in the no-load and load-limited states of the DPF; 3) Build and calculate the DPF carbon The mathematical model of the load; 4) Substitute the actually measured pressure drop before and after the DPF into the mathematical model under the exhaust flow rate, and calculate the carbon load value of the current DPF; 5) Substitute the carbon load value of the current DPF The load value is compared with the DPF carbon load limit value to determine whether the current state of the exhaust particulate filter of the diesel engine needs to be regenerated. The invention can accurately estimate the carbon load of the particle trap, has high reliability of the estimation result, and helps to promote the timely regeneration of the DPF.

The invention provides a diesel vehicle exhaust particle capturing catalyst. The catalyst is composed of a metal shell and an inner core, wherein the inner core is a columnar body and formed by stacking inertia alumina porcelain balls coated with binding agents; the cross section of the inner core is round, square, oval or racetrack-shaped; multiple exhaust channels are evenly arranged inside the inner core and are arranged in the circumferential or radial direction; the sections of the channels are rectangular, round and fan-shaped; the sum of the sectional areas of the channels is not larger than 25% of the sectional area of the inner core; and the length of the channels in the axis direction is 60%-100% that of the columnar body. According to the diesel vehicle exhaust particle capturing catalyst, as the binding agents evenly coating the porcelain balls have a large number of pores, the specific area is large, and the adsorption effect of particles is high; and as the exhaust channels of the diesel vehicle exhaust particle capturing catalyst are each of a special-shaped structure, the capturing effect of the particles is very high.

The invention discloses a post-treatment method for diesel engine exhaust particulates, which uses high-energy electrons generated by local dielectric barrier corona discharge with relatively small discharge power to charge diesel exhaust particulates, and charges the exhaust particulates of diesel engines through foam ceramics placed in an alternating electric field. Filtration of diesel engine exhaust particles; when the amount of diesel exhaust particles accumulated in the foam ceramics causes the exhaust back pressure of the diesel engine to rise, a large discharge power is used to fill the entire space of the dielectric tube with a filamentary discharge, generating a large amount of low-temperature plasma Oxidatively decomposes the diesel exhaust particles accumulated in the foam ceramics to realize the regeneration of the foam ceramic filter body. The invention can ensure that the exhaust back pressure of the diesel engine is low and effectively avoid damage to the filter body during regeneration, and at the same time improve the filtering efficiency of the exhaust particles of the diesel engine. The invention can be applied to aftertreatment of exhaust particulates of diesel engines.

The invention relates to a method for judging the regeneration time of a diesel engine exhaust particle trap. It includes the following steps: 1) Select the steady-state working conditions of the diesel engine series and measure the exhaust gas flow through the DPF under each working condition; 2) Determine the front-to-back pressure drop corresponding to the exhaust flow of the DPF under no-load and load-limiting conditions under different working conditions ; 3) Draw the DPF regeneration threshold pressure drop diagram according to the obtained DPF load-limited state corresponding pressure drop value, and correct the drawn threshold pressure drop diagram to obtain the final DPF regeneration threshold pressure drop diagram; 4) In the selected Under the steady-state working condition of the diesel engine, first determine the exhaust flow corresponding to the working condition, and compare the actual measured pressure drop before and after the DPF with the threshold pressure drop corresponding to the flow in the threshold pressure drop diagram; 5) judge the measured DPF Whether the front-to-back pressure drop is greater than the corresponding threshold pressure drop, and then determine whether the current DPF state needs to be regenerated. The invention can more accurately determine the regeneration timing of the DPF and promote the timely regeneration of the DPF.

The invention relates to a method for batching and mud-mixing a wall-flow honeycomb ceramic carrier blank for capturing diesel engine exhaust particles. ① Mix the mixed powder of pure silicon carbide and methyl cellulose, pour the pure silicon carbide and methyl cellulose into the blender and stir, so that the silicon carbide powder and methyl cellulose powder can be mixed evenly; ② Stir the pure silicon carbide Mix the powder with methyl cellulose for a few minutes, mix the flour aqueous solution mixed with flour and water, and pour it into the mixer while stirring. After pouring all the flour aqueous solution into the mixer, stir and mix the mud fully; ③ After mixing Add tung oil to the mud. After stirring for a few minutes, when the mud is sticky and easy to stick together, mix the mud well, put the mud in a container and seal it up to ensure that the mud in the mud Moisture does not evaporate and stale time is several days.

The invention relates to the technical field of measurement and provides a method for measuring and calculating the median particle diameter of particles in the exhaust gas of a compression ignition engine. A method for measuring the median particle diameter of the particles in the exhaust gas of a diesel engine mainly comprises the following steps: collecting particle samples to be measured; dispersing the particle samples to be measured; acquiring an electron microscope image of dispersed particles; judging the dispersion degree of agglomerated particles; and solving the diameter of a single particle in Mi to finally obtain the median particle diameter D50 of the particles in the exhaust gas of the diesel engine. Compared with the prior art, the method has the characteristics that the particle diameter can be obtained without conversion of the current and the particle diameter; and the particles with the particle diameter of 0.1 to 0.5 micron can be intuitively obtained. Through the particle electron microscope image processing, the single particle can be distinguished, and the particle diameter measurement accuracy of the particles is improved.

The invention discloses an exhaust particulate matter charging and charging capacity measuring device of a diesel engine. The exhaust particulate matter charging and charging capacity measuring device comprises a water removal device, a charging reactor and a Faraday cylinder of an improved structure. The water removal device comprises a cooling system and a heating system. The charging reactor comprises a bobbin type corona generator and a positive / negative high voltage power source. The Faraday cylinder of the improved structure comprises a PVC pipe, a first metal net, a second metal net, a rubber pipe, a filter paper bracket, a quick connector, a stainless steel inner barrel, a stainless steel outer barrel and a flow control system. Water in exhaust of the diesel engine is reduced through the cooling system, the exhaust is made to be constant at certain temperature through the heating system, the heated exhaust is then introduced into the charging reactor to react, and therefore particulate matter is charged. On-line measurement is adopted in the whole charging capacity measurement process, the charging capacity of the particulate matter is measured through the Faraday cylinder of the improved structure, and the charged particulate matter is captured through filter paper. By means of the positive / negative high voltage corona discharge technology, real-time capturing of the particulate matter of the diesel engine and measurement of the charging capacity are achieved.