Engine with microbial reaction purifier

Details Engine with microbial reaction purifier Engine with microbial reaction purifier

1999-01-26

2001-04-17

Beisner, William H. (Department: 1744)

Chemistry: molecular biology and microbiology

Process of utilizing an enzyme or micro-organism to destroy...

Treating gas, emulsion, or foam

C435S289100, C060S273000, C060S282000

Reexamination Certificate

active

06218173

ABSTRACT:

FIELD OF THE INVENTION
This invention relates to the purification of engine exhaust gas using microorganisms.
BACKGROUND OF THE INVENTION
A method is known to purify harmful substances such as hydrocarbons (HC), carbon monoxide (CO), sulfur (S) and nitrogen oxides (NOx) contained in the exhaust gas discharged from a vehicle engine by using a metal catalyst. In such purification methods, however, processing ability is low when the catalyst is not fully activated, e.g. immediately after engine startup.
A method is also known to reduce the production of NOx in an engine by recirculating part of the exhaust gas into the engine intake air. In order to achieve considerable reduction of NOx, the exhaust recirculation amount must be large, for purifying harmful substances in the exhaust gas of an engine.
SUMMARY OF THE INVENTION
It is therefore an object of this invention to increase the purification efficiency of harmful substances contained in the exhaust gas of an engine.
In order to achieve the above object, this invention provides an engine comprising a combustion chamber for burning a mixture of fuel and air, an exhaust gas passage connected to said combustion chamber, and a reaction purifier installed in said passage, said purifier bringing a microorganism which removes a component of said exhaust gas in contact with said exhaust gas.
This invention also provides an engine comprising a combustion chamber for burning a mixture of fuel and air, an intake passage for supplying air to said combustion chamber, an exhaust recirculating passage for introducing a part of the exhaust gas in said combustion chamber into said intake passage, and a reaction purifier installed in said intake passage, said reaction purifier bringing a microorganism which removes a component of said exhaust gas in contact with intake air containing said exhaust gas.
This invention also provides an engine comprising a combustion chamber for burning a mixture of fuel and air, an intake passage for supplying air to said combustion chamber, and a reaction purifier for bringing a microorganism which feeds on nitrogen in contact with the air in said intake passage.
The details as well as other features and advantages of this invention are set forth in the remainder of the specification and are shown in the accompanying drawings.


REFERENCES:
patent: 3-147777 (1991-06-01), None
patent: 1-175972 (1991-07-01), None
patent: 5-154341 (1993-06-01), None
patent: 8-141356 (1996-06-01), None
patent: 93/18800 (1993-09-01), None
T. Imanaka et al., “A New Mixotrophic Bacterium That Can Fix CO2and Assimilate Aliphatic and Aromatic Hydrocarbons Anaerobically”, Mol. Bio. of Pseudo., (1996), pp. 289-297.

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