Power plants – Internal combustion engine with treatment or handling of... – Methods
Patent
1995-03-09
1996-09-24
Hart, Douglas
Power plants
Internal combustion engine with treatment or handling of...
Methods
55466, 55DIG30, 60275, 60311, 95 68, 95 70, 96 55, F01N 318
Patent
active
055579230
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to a method and a device for the removal of particles, in particular particles of soot, from the exhaust of internal combustion engines, whereby the particles are electrostatically charged by means of at least one electrode, some of the particles form agglomerates, and the particles and/or particle agglomerates are separated by means of one or more filters, as well as a device for the removal of particles, in particular soot particles, from the exhaust of internal combustion engines, whereby the device comprises a housing with a feed line and a discharge line for the exhaust, at least one electrode which is connected to a high voltage source for the electrostatic charging of the particles, and a filter body.
2. Description of the Prior Art
The reduction of particulate emissions in exhaust gases plays a major role in efforts to further reduce pollution caused by exhaust gases from internal combustion engines, in particular from Diesel engines. Numerous attempts have therefore been made to remove the particulate emissions, in particular particles of soot, which are contained in exhaust gases.
A survey of the prior art has identified the publication "Rul.beta.filtertechnik fur Stadtlinienbusse", Internationales Verkehrswesen ["Soot Filter Technology for Municipal Buses", International Transportation], 40 (1988), Volume 1, January/February. Ceramic monolith filters, filter candles with a filter means made of ceramic or wire mesh or filters wound with ceramic yarn or a combination of an electric coagulator and a downstream cyclone are used to remove particulates.
In the last-named system for the removal of particles, an agglomeration of the particles takes place in the electric coagulator, so that the particles can then be removed in the downstream cyclone, taking advantage of the centrifugal force on the particles in the receiving chamber of the cyclone, while the gas current is emitted through the submerged tube of the cyclone as clean gas into the exhaust. In this particle-removal system, however, it is necessary to make separate arrangements for the disposal of the particles removed.
When filters are used, a regeneration or replacement of the filter is necessary, since the particles which have been removed clog the filter, and the pressure loss caused by the filter increases as the filter charge increases. The regeneration is performed by burning away the particles at temperatures which are above the ignition temperature of the soot. Since this temperature is not reached in exhaust gases from internal combustion engines, or is reached only during full load operation, either the exhaust gas temperatures must be increased by motor-driven measures, or the ignition temperature of the exhaust must be reduced by additives added independently to the fuel, to the intake air or to the exhaust, or by catalytic coatings on the filter. An additional possibility is a forced regeneration by the application of heat, e.g. by means of burners.
Metal filters, such as filters made of wire mesh, have the disadvantage of a reduced high-temperature strength, which is insufficient for the removal of particulates from the above-mentioned exhaust gases. In particular, filters made of such material are unsuitable for a thermal regeneration.
U.S. Pat. No. 4,406,119 discloses a method for the removal of particles from the exhaust flow of internal combustion engines, whereby the particles are negatively charged by means of an electrode with a high voltage of 10-20 kV, some of the particles form agglomerates and are separated by means of a filter and a downstream cyclone or heating element. The filters consist of porous ceramic or metal meshes or tissues.
EP-A-0 425 433 discloses a process in which charged soot particles are filtered out in at least one filter with opposite polarity. The filter material consists of an open-pore network structure made of fibers or a base structure which has high temperature resistance, whereby the network structure is designed
REFERENCES:
patent: 4791785 (1988-12-01), Hudson et al.
patent: 4871515 (1989-10-01), Reichle
patent: 5425236 (1995-06-01), Haerle
patent: 5440876 (1995-08-01), Bayliss
"Ru.beta.filtertechnik fur Stadtlinienbusse", Internationales Verkehrswesen Soot Filter Technology for Municipal Buses, International Transportation] 40 (1988), vol. 1, Jan./Feb., pp. 46-51, (No Translation).
Bolt Heinz
Schoneborn Axel
Walser Franz
GST Systeme, Gesellschaft Fur Abscheide-Und Steuertechnik mbH
Hart Douglas
Linde Aktiengesellschaft
LandOfFree
Method and device for removing particles from exhaust gases from does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method and device for removing particles from exhaust gases from, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and device for removing particles from exhaust gases from will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1921229