Exhaust gas filter for diesel engines

Details Exhaust gas filter for diesel engines Exhaust gas filter for diesel engines

1985-12-19

1987-11-10

Hart, Douglas

Power plants

Internal combustion engine with treatment or handling of...

By sorber or mechanical separator

55487, 55523, 55DIG30, 422180, F01N 302

Patent

active

047048638

ABSTRACT:
An exhaust gas filter for Diesel engines that consists of a monolithic filter block made of a porous ceramic material having a plurality of ducts extending in the flow direction of the exhaust gases, said ducts alternately being closed by plugs in order to force the passage of gas through the duct walls into adjacent ducts. In the case of this exhaust gas filter, the filter block is divided into zones having a decreasing porosity in the flow direction of the gases, and the plugs which force the passage of the gas through the duct walls are each arranged in the area of the zone border. Filters are preferred that have two to four zones of decreasing porosity. The exhaust gas filters are manufactured in that a filter blank that has the largest desired porosity is immersed in a solution or suspension of a porosity-reducing agent up to the desired zone border and is subsequently dried and is possibly burnt. Preferred agents for reducing the porosity are water glass solutions or cordierite suspensions.

REFERENCES:
patent: 4451441 (1984-05-01), Ernest
patent: 4519820 (1985-05-01), Oyobe
patent: 4576799 (1986-03-01), Worner
patent: 4604869 (1986-08-01), Yoshida

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