Muffling and denitrating apparatus
AssigneeAjiawasu Kabushiki Kaisha
InventorHideo Yoshikawa
Life of this patent
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Abstract
A muffling and denitrating apparatus capable of lowering a level of noise generated by a combustion engine and reducing a concentration of NOx in exhaust gas of the engine. Sound-damping and denitration are accomplished by a carbon fiber or particle layer arranged in the apparatus. Exhaust sound is adsorbed by carbon fibers or carbon particles, resulting in a sound pressure thereof being reduced. NOx is converted into N.sub.2 and CO.sub.2, to thereby be decreased in concentration. Carbon fibers and/or carbon particles for the carbon fiber or particle layer are preferably treated or modified with nitrogen monoxide gas or a nitric acid solution, resulting in having an increased surface area as large as 80 to 2000 m.sup.2 /g.
Claims11
A muffling and denitrating apparatus for coupling to exhaust gas inlet and outlet pipes through which exhaust gas flows, comprising:
- a substantially cylindrical body formed of a hollow vessel, said body having first and second opposed ends;
- a muffling and denitrating section arranged in said body and including a cover member and a carbon layer containing at least one of carbon fibers and carbon particles and retained in said cover member, said cover member being made of a perforated material and extending circumferentially to cover substantially an entire cylindrical circumference of said body other than a lower portion thereof and also covering substantially the entire first and second ends of said body;
- a soot reservoir section arranged at said lower portion of said body for collecting soot;
- heating means arranged in said soot reservoir section;
- at least one rectifying plate arranged in said body and formed with a plurality of through-holes, said at least one rectifying plate dividing a space in said body defined by said cover member and said soot reservoir section into a first space section and a second space section;
- an exhaust gas inlet pipe extending through a first one of said through-holes in said at least one rectifying plate and connecting only into said first space section, and
- an exhaust gas outlet pipe extending through a second one of said through-holes in said at least one rectifying plate and connecting only into said second space section.
Dependencies are inferred from the claim text.