DEVELOPMENT OF THE CONCEPT OF NON-FLAME EXHAUST GAS REACTORS 620402
Investigations of the non-flame oxidation of exhaust gas hydrocarbons and carbon monoxide are reported. These investigations cover basic studies of the relationship of temperature, oxygen, and residence time to oxidation rates with external, supplementary, exhaust gas heating. Reaction (oxidation) is then shown to be possible without supplementary heat in the test installation of a homogeneous reactor on one cylinder of a V-8 engine on an engine dynamometer.
Vehicle tests were then conducted to determine the operational characteristics and oxidation performances of a series of multi-cylinder reactors mounted on 292-cubic-inch-displacement engines. Unique methods of air introduction and heat conservation are described. These reactors were capable of effectively decreasing exhaust concentrations of hydrocarbon and carbon monoxide while the vehicles were driven over a traffic route.
Tests of two reactors designed especially for fast warm-up are reported. These tests showed improved oxidation performance when test procedures emphasizing warm-up were used. The experimental materials used for interior insulation in these reactors failed after less than two hours of testing.
Tests with reactors on 144-cubic-inch-displacement engines in a compact car have been relatively unsuccessful because of the low exhaust gas temperatures characteristic of these engines.
The limited success so far achieved in the application of the homogeneous reactor principle to the oxidation of vehicle exhaust hydrocarbons and carbon monoxide indicates that additional investigations of materials and of the applicability of this principle to other engines are warranted.