Power plants – Internal combustion engine with treatment or handling of... – By electrolysis – electrical discharge – electrical field – or...
Patent
1986-12-04
1989-05-02
Hart, Douglas
Power plants
Internal combustion engine with treatment or handling of...
By electrolysis, electrical discharge, electrical field, or...
55 96, 55268, 55466, 55DIG30, 60295, 60303, 110250, 110346, 219 1055A, F01N 302, H05B 664
Patent
active
048256510
DESCRIPTION:
BRIEF SUMMARY
This invention relates to a device and a process for separating soot or other impurities from the exhaust gases of an internal-combustion engine, particularly of a Diesel internal-combustion engine, the device having a microwave source, that is coupled to an intermediate section of the exhaust pipe and excites an electromagnetic field there.
From DE-PS No. 30 24 539, a device of this type is known where the intermediate section contains an exhaust gas filter that is held by a metal body and through which the exhaust gases flow essentially radially. The exhaust gas filter has the purpose of holding back the soot in the exhaust gases. If the soot deposits exceed an indicated degree, an electromagnetic field is excited in the intermediate section by means of which the soot is to be burned.
It is a disadvantage in the case of the arrangement known from DE-PS No. 30 24 539 that the exhaust gas filter in an increasing depositing of soot, represents a considerable flow resistance to the exhaust gases that, particularly in the case of internal-combustion engines, results in losses of performance. Since the filter is held by a metal die that projects coaxially into the adapter, the electromagnetic field develops essentially between the front wall of the metal die and the front wall and the adapter. However, only very few lines of electric flux end on the circumference of the metal die on a which filter mat is disposed. The energy density of the electromagnetic field is therefore negligibly low in the vicinity of the filter mat. The intended burning of the soot particles deposited there, for this reason, cannot be carried out. In the area of high energy density, on the other hand, namely at the front wall of the die, no filter mat is located.
In contrast, it is the objective of the invention to further develop the device of the initially mentioned type in such a way that an effective burning of the soot is carried out at a low flow resistance.
According to the invention, this objective is achieved by the fact that the adapter is developed as a cavity resonator and in its exhaust gas inlet and exhaust gas outlet has one metal grid respectively, and that in the cavity resonator, an insert made of a dielectric material concentrates the exhaust gas flow in an area of high energy density of the electromagnetic field.
The advantages of the invention are that the exhaust gases flow through the cavity resonator over its whole axial length in the area of high microwave energy density at and during their dwell time in the resonator are burned by the microwave energy. In this case, the two metal grids, also in the area of the exhaust gas inlet and the exhaust gas outlet, produce a sufficiently metallic limiting of the microwave field by means of which the high quality of the resonator is achieved that is required for attaining high energy densities and a homogenous field, and the unavoidable radiation of microwave energy through the exhaust pipe is effectively reduced. Since, in addition, the exhaust gas flow by the dielectric insert during the passage through the radiator is concentrated in the area of high energy density, the microwave field can in this area effectively burn the soot particles passing through at a high speed.
By means of the invention, a device is therefore obtained that is simple in its structure and by means of which installations into the resonator are avoided that form flow resistances and in addition the servicing work is eliminated that is required for a soot retaining device. The required microwave source may also, since radiation losses from the resonator are largely avoided, be designed to be relatively small.
Preferably, the device, during the operating time of the internal-combustion engine, is switched on continuously or at predetermined intervals in order to continuously burn the soot particles flowing into the resonator.
In accordance with the invention metal grids at the exhaust gas inlet and outlet are developed as honeycomb grids with a small wall thickness and extend particularly from the e
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Furtauer Johann
Puschner Herbert A.
Bayerische Motoren Werke Aktiengesellschaft
Hart Douglas
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