Exhaust gas cleaning system for diesel engines

Details Exhaust gas cleaning system for diesel engines Exhaust gas cleaning system for diesel engines

1980-03-25

1982-08-24

Hart, Douglas

Power plants

Internal combustion engine with treatment or handling of...

By means producing a chemical reaction of a component of the...

60295, 60297, 60303, 422183, F01N 328, F01N 338

Patent

active

043454313

DESCRIPTION:

BRIEF SUMMARY
DESCRIPTION

1. Technical Field
The present invention relates to an exhaust gas cleaning system for diesel engines mounted on construction equipments or ordinary vehicles such as diesel buses and trucks or for diesel engines installed in buildings. More particularly, the invention is concerned with an exhaust gas cleaning system for diesel engines, capable of ensuring for a long period of time the removal of smoke particles and noxious components, as well as bad smell, of the exhaust gas emitted from the diesel engine.
2. Background Art
Hitherto, there have been proposed and used various exhaust gas cleaning systems for diesel engines the typical examples of which are shown below. cyclone and a catalyst bed disposed in the passage of the exhaust gas emitted from the diesel engine. having a combination of water-scrubbing type smoke removal device adapted to atomize and spray scrubbing water into the exhaust gas and a catalyst bed.
The inertia type dust collecting device such as the cyclone of the above-mentioned system (a), however, is effective only for dust particles having particle sizes of greater than several microns, and cannot be used effectively for catching smoke particles having smaller particle sizes. Generally, the smoke particles of the exhaust gases emitted from the diesel engine are too small to be caught by the inertia type dust collecting device. Thus, it is not possible to satisfactorily catch the smoke particles of the exhaust gas from diesel engines, with the cyclone. As a result, carbon particles of the smoke are inconveniently attached to the surface of the catalyst during long use to deteriorate the function of the catalyst to make it impossible to effectively remove the bad smell and noxious components such as carbon monoxide and hydrocarbon. To regenerate this catalyst, it is necessary to heat it up to a high temperature which is not only troublesome but also causes a deterioration of the catalytic function, as well as distortion or breakdown of the catalyst.
On the other hand, in the above-mentioned conventional system (b), the water-scrubbing type smoke removing device can remove the smoke satisfactorily. However, as a result of the supply of the water, a large amount of steam is generated to seriously hinder the visibility. Further, troublesome maintenance work such as supply of the scrubbing water and so forth is required.
For completely removing the bad smell and the noxious components of the exhaust gas, it is necessary that the exhaust gas has a high temperature of between 300.degree. C. and 500.degree. C. at the catalyst inlet. However, in the system (b) above, the exhaust gas temperature is inconveniently lowered as the exhaust gas is scrubbed with the water by the water-scrubbing type smoke removing device. For this reason, it is not allowed to install the catalyst at the downstream side of the water-scrubbing type smoke removing device. Consequently, the smoke particles are inevitably attached to the catalyst, resulting in various problems which have been described before in connection with the drawbacks of the conventional system (a).
It is, therefore, an object of the invention to provide an exhaust gas cleaning system for diesel engines, capable of maintaining a high efficiency of exhaust gas cleaning for a long period of time, by removing the smoke particles without fail by a heat-resistant filter disposed at the upstream side of the catalyst bed, thereby to overcome above described problems of the prior art.
It is another object of the invention to provide an exhaust gas cleaning system for diesel engines, in which the construction for burning and removing the smoke particles which have been caught by the heat-resistant filter as the latter is passed by the exhaust gas is highly simplified.


DISCLOSURE OF THE INVENTION

According to the invention, an exhaust gas cleaning system for diesel engines has an exhaust gas cleaning passage for cleaning the exhaust gas emitted from a diesel engine, a heat-resistant filter disposed at the upstream side portion of the exhaust

REFERENCES:
patent: 2898202 (1959-08-01), Houdry
patent: 2946651 (1960-07-01), Houdry
patent: 3306035 (1967-02-01), Morrell
patent: 3503716 (1970-03-01), Berger
patent: 4054418 (1977-10-01), Miller

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