Abstract:
Verfahren und Vorrichtung (1) zur Behandlung eines Partikel (2) ausweisenden Abgases zumindest umfassend eine Partikelagglomerationseinrichtung (3) und einen Partikelabscheider (4), wobei die Partikelagglomerationseinrichtung (3) wenigstens eine Apparatur (5) zur Ausbildung eines elektrischen Feldes (6) sowie eine für das Abgas durchströmbare Partikelzwischenspeichervorrichtung (7) aufweist und in Strömungsrichtung (8) des Abgases vor dem Partikelabscheider (4) positioniert ist. Dabei werden die Partikel (2) an der Partikelzwischenspeichervorrichtung (7) aufeinander abgelagert, so dass Partikel-Agglomerate (15) gebildet sind und nach kurzer Zeit wieder von der Partikelzwischenspeichervorrichtung (7) entfernt und dem Partikelabscheider (4) zur Umwandlung zugeführt werden.
Abstract:
Wabenkörper (1) mit einer Vielzahl von Kanälen (2), der mit zumindest einer wenigstens teilweise strukturierten Blechfolie (3) gebildet ist, wobei die Blechfolie (3) eine Verlaufsrichtung (4) hat und mit sich selbst oder zumindest einer weiteren glatten Blechfolie (5) oder strukturierten Blechfolie (3) oberseitige Verbindungsstellen (6) und unterseitige Verbindungsstellen (37) aufweist, und weiter zumindest oberseitige Verbindungsstellen (6) oder unterseitige Verbindungsstellen (37) eine gekrümmte Verbindungslinie (33) bilden und zwischen den jeweiligen Verbindungsstellen der gekrümmten Verbindungslinie (33) Dehnungsfugen (38) gebildet sind.
Abstract:
Vorrichtung (1) zur Behandlung von Abgasen einer mobilen Verbrennungskraftmaschine (2) umfassend zumindest: eine Abgasleitung (3) mit einer Erstreckungsrichtung (4); einen Wabenkörper (5) umfassend wenigstens keramisches oder extrudiertes Material; und mindestens ein metallisches Faservlies (6), welches wenigstens teilweise zwischen der Abgasleitung (3) und dem Wabenkörper (5) angeordnet ist,bei der mit dem mindestens einen Faservlies (6) in Erstreckungsrichtung (4) zumindest zwei Zonen (7, 8, 9) unterschiedlicher Funktionen gebildet sind, wobei wenigstens eine erste Zone (7) Mittel zum Lagern des Wabenkörpers (5) und die mindestens eine weitere Zone (8, 9) ein Mittel aus der Gruppe von Mitteln zum thermischen Isolieren und Mitteln zum Abdichten gegenüber eines Gases ausweist.
Abstract:
The invention relates to a conical honeycomb structure with an axis and a tubular shell conical with respect thereto. The honeycomb structure comprises at least one pile which is obtained by at least one sheet (5) having waves (9) at least partially. The sheets (5) bound a plurality of channels though which a fluid can flow. Structures extending substantially in the axial direction of the honeycomb structure project from the waves (9) of the sheets (5).
Abstract:
For the catalytic reaction of exhaust gases in an exhaust system, in particular an exhaust system for use in internal combustion engines, a device is proposed with a catalyst carrier element (1) which is provided with a plurality of channels (2) through which the exhaust gas can flow. The free cross section (4) of flow of the channels (2) is partially closed in the direction of flow of the exhaust gas by plastic deformation of the channel walls (11), specifically, in an outer ring region (3) of the catalyst carrier element (1). The plastic deformation can be carried out using, for example, a tool (17) provided for this purpose with a disc (18) which can rotate about an axis (19). The disc (18) is forced against the catalyst carrier element (1) and the casing (10) to create a plastic deformation of the casing tube (10) and channel walls (11) in the form of a peripheral crimp (20) pointing towards the carrier element (1). Other techniques can be applied to create the plastic deformation. The outer channels thus closed off form a thermal insulation against the casing tube (10) which helps the catalyst carrier element (1) to heat up more rapidly in the cold start phase.
Abstract:
The description relates to a process for soldering metal structures, especially honeycomb bodies for exhaust gas catalysts. Here, the solder is applied in powder form and bonded to the metal structure by a bonding agent acting as an adhesive, binder or adhesion promoter. The bonding agent securing the powdered solder has two different states relating to its bonding action during the process for producing the metal structure. A first state is less and a second more strongly adhesive, and the adhesion can be selected or adjusted depending on external conditions, especially the temperature.
Abstract:
A process is disclosed for reducing pollutant emissions of a Diesel engine (1) equipped with a downstream oxidation-type catalytic converter (4) during cold start, underload and/or idle running. The oxidation-type catalytic converter (4) has at its inflow side at least one electrically heatable partial area (3) that is heated before or after starting the Diesel engine (1) up to a temperature at which the deposited soot is burned, in particular up to a temperature above approximately 600 DEG C. Heating happens very quickly, preferably within less than 10 seconds, and then additional fuel (5) and/or air (6) may be fed into the exhaust fume system (2) in order to consume by an exothermic reaction also the soot deposited on surfaces of the oxidation-type catalytic converter (4) located further downstream. The exhaust fumes are thus decontaminated even in unfavourable operating conditions of the Diesel engine.
Abstract:
In a process for monitoring the performance of a catalyst (8) for exhaust gases of an internal combustion engine (1) with an exhaust gas system (5, 8, 9), the temperature of two spatially separate cross-sectional regions in the exhaust gas system is measured by temperature sensors (TF1, TF2; TF1', TF2') and monitored by an electronic monitoring device (10). At least one part of the volume of the catalyst which is essential for the catalytic conversion of noxious substances in the exhaust gas is located between the two measurement points. The temperature sensors (TF1, TF2) do not measure discretely but integrally over a representative portion of the cross-sectional region. The temperature measurement points can be integrated in the catalyst (8), which can also preferably be heated electrically (17, 18). In a properly functioning system, the exothermic reaction in the catalytic conversion of noxious substances in the exhaust gas brings about a certain temperature difference between the two measurement points, which can be monitored. The function of the catalyst (8) and/or engine (1) and/or electronic engine control system (2) can be deduced from the sign and/or absolute value and/or temporal variation of the temperature difference. Preferred field of application: motor vehicles with spark ignition engines with an electronic engine control system.
Abstract:
The invention relates to the generation of heat through the flameless burning of a fuel in a gas current, whereby the gas current is conveyed in a gas flow system (102) including at least one loop (103) in which the gas at least partly circulates. The gas flow system (102) is fitted with an inlet device (107) to feed the fuel in, a gas inlet (104), a gas outlet (105), a first conveyor device (106) to maintain the gas current in the loop (103), a heating device (108) to heat the gas flow before the start of flameless combustion and a first catalytically active element (109) to trigger flameless combustion. The heat generated during combustion is absorbed by a component (101) of the gas flow system (102) around or through which the gas may flow; such a component may be a heat exchanger, especially in motor vehicle heater systems, and exhaust gas catalysts for motor vehicles, by which preheater systems for these exhaust gas catalysts are formed.
Abstract:
An electrically conductive honeycomb body, in particular a catalyst support, can be directly heated electrically and comprises a temperature-dependent resistor for functional control and adjustment. To obtain a suitable electrical resistance between 0.03 and 2 ohms, preferably between 0.1 and 1 ohm, the honeycomb body (12) is subdivided electrically, cross-sectionally and/or axially, by gaps and/or electrically insulating intermediate layers (128) or coatings so that at least one electrical current path having the desired resistance is obtained. A honeycomb body (120) of this type can be used as a catalyst support in motor vehicles and heated before and/or after starting. It can therefore reach the operating temperature required for a catalytic reaction more rapidly, which reduces the exhaust gas emission as early as the starting phase of a motor vehicle. The overall performance of the catalyst can be monitored by continuous or periodic measurement of the electrical resistance of the honeycomb body, and the heating can be suitably adjusted if necessary.