摘要:
An exhaust gas purifying system has a honeycomb filter including a porous partition wall having a number of pores arranged so that a plurality of cells communicating between two end faces are formed, and a plugging portion disposed in either of the end faces or inside the cell so as to plug the cell; and a NOx purifying catalyst including a honeycomb catalyst carrier having substantially same shape as the honeycomb filter, and a NOx selective reducing SCR catalyst or a NOx occluding catalyst carried on surface of the partition wall and/or on surface of the pores, wherein the honeycomb filter and the NOx purifying catalytic member are disposed in this order in an exhaust gas flow path where exhaust gas discharged from a diesel engine circulates.To provide an exhaust gas purifying system which realizes excellent purifying efficiency of NOx contained in exhaust gas discharged from a diesel engine, and small pressure loss, and can be mounted in limited space.
摘要:
A means capable of supplying exhaust gas sufficiently imitating exhaust gas from actual diesel engines is provided. A PM generating apparatus has a constitution in which combustion air supplied to the space between a chassis and an outer casing via an air inlet is introduced into the space between the outer casing and an inner casing via through-holes of the outer casing, and a fuel injected by an fuel-injection means into the space between the chassis and the outer casing is introduced into the space between the outer casing and the inner casing via the through-holes of the outer casing, wherein the fuel is combusted to generate PM.
摘要:
A method for analysis of a cell structure includes an analysis step which includes replacing the cell structure or a part of the cell structure with an anisotropic solid body having property values of equivalent rigidity characteristics, creating a finite element model of the anisotropic solid body based on the property values, applying an internal temperature distribution or an external pressure to the finite element model of the anisotropic solid body, and calculating the stress to obtain a stress distribution in the anisotropic solid body. The structural analysis method is a means for analyzing the stress distribution in the cell structure due to the internal temperature distribution or external pressure which can be realized by using general-purpose computer software and hardware without performing a simulation test and making a large investment.
摘要:
A butterfly valve for hot fluid, including: a cylindrical duct; a flap pivotally mounted inside said duct; a shaft attached to said flap so that a rotational torque can be transmitted to the flap; a pin inserted into a peripheral portion of said flap so that the pin is rotatable; and a housing in which the duct, the flap, the shaft, and the pin are installed; wherein the flap is loaded from one end of the shaft via a spring in the axial direction of the shaft, the load is supported by the housing via the pin in the peripheral portion of the flap, and neither of a peripheral portion of a flap where a shaft is attached nor a peripheral portion a flap where a pin is inserted contacts said duct when the valve is fully opened. In the butterfly valve a driving force for opening and shutting does not change, and the butterfly valve smoothly opens and shuts even in use for a long period of time in a hot gas flow even in the case that the use of the valve at a high temperature causes an adhesion of oxidized scales or an increase of a coefficient of friction between members.
摘要:
Disclosed is a catalyst carrier which is used for carrying a catalyst thereon. The catalyst carrier is characterized in that the apparent specific heat measured at 800° C. is 1.8 times or more greater than that measured at room temperature, wherein the apparent specific heat means a charge heat amount required for substantially increasing the temperature of a unit mass (kg) by 1 K, inclusive of the influence of endotherm or exotherm caused by change in crystalline form, partial melting, coagulation, phase transformation, vitrification, amorphous-formation, crystallization and the like.
摘要:
There is provided a wall flow type exhaust gas purification filter is provided with a honeycomb structure having porous ceramic partition walls 12 and plugging portions disposed in one side opening end portions of predetermined cells and the other side opening end portions of the other cells. In the exhaust gas purification filter, when an average pore size is obtained for each region of ⅓ mm×⅓ mm in a range of 10 mm2 in an arbitrary cross section perpendicular to a surface of the partition walls 12, a large pore region having an average pore size of 15 μm or more has an area of 0.1 mm2 or more, and a small pore region having an average pore size of 8 μm or less has an area of 0.1 mm2 or more.
摘要:
There are disclosed a honeycomb structure capable of providing a honeycomb catalytic body which is excellent in purification efficiency with a small pressure loss and which can be mounted even in a limited space, a honeycomb catalytic body which is excellent in purification efficiency with a small pressure loss and which can be mounted even in a limited space, and a manufacturing method of the same. A honeycomb catalytic body 50 of the present invention is a honeycomb catalytic body of a flow-through type through which cells as through channels extend from an inlet to an outlet, both the surfaces of partition walls 4 of a honeycomb structure 1 and the inner surfaces of pores 25 carry a catalyst to form catalyst layers 5, and the catalyst carrying partition walls have a permeability of 1×10−12 [m2] or more, preferably 1×10−9 [m2] or less.
摘要:
A honeycomb filter 20 includes a plurality of porous partition portions 22 forming a plurality of cells 23 serving as channels of fluid and trapping layers 24 that are formed on the partition portions and configured to trap a solid component contained in the fluid. In the honeycomb filter 20, a predetermined trapping region present on the partition portions 22 satisfies that, in an inscribed-circle-diameter distribution obtained by dividing an image of the partition portions captured with an electron microscope into a material region and a plurality of pore regions and by drawing maximum inscribed circles individually inscribed in the pore regions, a median pore diameter D50 is 1 μm or more and 6 μm or less and a median pore diameter D80 is 1 μm or more and 7 μm or less, and an inscribed-circle porosity determined from the inscribed-circle-diameter distribution is 35% or more and 60% or less.
摘要:
According to the present invention, there is provided a honeycomb catalytic structure comprising: a honeycomb structure comprising porous partition walls having a large number of pores, disposed so as to form a plurality of cells extending between the two end faces of the honeycomb structure and plugging portions disposed at either one end of each cell, and a catalyst layer containing a catalyst, supported at least on the inner surfaces of the pores of the honeycomb structure, wherein the mass of the catalyst layer per unit volume (1 cm3) of the honeycomb structure (g/cm3) is 60% or less of the volume of pores per unit volume (1 cm3) of the honeycomb structure (cm3/cm3).
摘要翻译:根据本发明,提供了一种蜂窝状催化剂结构体,其特征在于,包括:蜂窝结构体,其具有多孔分隔壁,所述蜂窝结构体具有多个孔,所述蜂窝结构体设置成形成在所述蜂窝结构体的两个端面之间延伸的多个孔, 设置在每个单元的任一端的部分和至少支撑在蜂窝结构的孔的内表面上的含有催化剂的催化剂层,其中每单位体积(1cm 3)的蜂窝体的催化剂层的质量 结构(g / cm 3)为每单位体积(1cm 3)的蜂窝结构体积(cm 3 / cm 3)的孔的体积的60%以下。
摘要:
There is provided a honeycomb catalyst body including, a honeycomb substrate, plugging portions, and a three way catalyst. All the cells are open in the inflow side end face, the honeycomb substrate has two regions of an inflow side region and an outflow side region, the inflow side region of the honeycomb substrate is a region from the inflow side end face to a position of 10 to 90% of a length in an central axial direction of the honeycomb substrate from the inflow side end face, and 100 to 400 g/L of the three way catalyst is loaded on the partition walls in the inflow side region, no catalyst is loaded on the partition walls in the outflow side region, and a ratio of the length to a diameter of the inflow side end face of the honeycomb substrate is 1.1 to 2.0.