Showing papers on "NOx published in 1968"

Oxides of Nitrogen from Gas Turbines

Abstract: Experimental and theoretical studies were made to provide information on nitrogen oxide concentrations produced by gas turbine engines. Nitric oxide concentrations of from 100 to 350 ppm, adjusted to stoichiometric conditions, were measured in aircraft turbojet engines. Concentrations of less than 50 ppm, similarly adjusted, were measured in a 60 hp industrial gas turbine. Concentrations of about 100 ppm, also adjusted, were measured in a laboratory combustor of a design similar to gas turbine combustors. Carbon monoxide and unburned hydrocarbon concentrations also were determined. Comparison with predicted equilibrium concentrations shows strong departures from equilibrium.

Rapid continuous determination of nitric oxide concentration in exhaust gases.

Abstract: The rapid determination of nitric oxide levels in exhaust gases is required both for laboratory studies of the exhaust emission characteristics of combustion engines and for routine inspection of motor vehicle exhaust. A continuous sampling, continuous analysis method for measuring nitric oxide has been demonstrated. Rapid oxidation of nitric oxide to nitrogen dioxide is obtained through ozonization. Nitrogen dioxide concentrations are determined by means of an ultraviolet absorption technique. Nitric oxide concentrations between 100 and 5000 ppm have been measured and response time of about 20 seconds obtained. The presence of unburned hydrocarbons in the exhaust sample has an adverse effect on the results of this technique which requires either the removal of hydrocarbons or adjustment of ozone concentration.

Effects of Air-Fuel Stoichiometry On Air Pollutant Emissions From an Oil-Fired Test Furnace

Abstract: This paper describes an experimental, domestic-sized, oil-fired furnace to be used for evaluation of fuel additives and equipment design modifications in reducing air pollutant emissions. Operating data and emissions of particulate matter, smoke, carbon monoxide, gaseous hydrocarbons, oxides of nitrogen, and oxides of sulfur are reported over the range of operable air-fuel ratio. Emission levels are interpreted in terms of key operating parameters and potential areas for reduction of emissions.

Instrumental methods for the detection of higher oxides of nitrogen in nitrous oxide

Abstract: SUMMARY This paper discusses the possible application of instrumental methods used by the British Coal Utilisation Research Association for flue gas analysis to detect the contamination, by higher oxides of nitrogen, of nitrous oxide (N2O) intended for use as an anaesthetic. Two galvanic instruments sensitive to 1 p.p.m v/v of nitrogen dioxide (NO2)—or, when supplemented by a pre-oxidizer, of nitric oxide and nitrogen dioxide (NO + NO2)—are described; either might be adapted to actuate an alarm. The methods are discussed in the light of governmental standards of air quality.