Abstract
In the present study, a new method named ‘water steam injection’ is introduced as a measure to reduce NOx emissions. Required energy for producing water steam has been obtained from exhaust energy via the heat exchanger which was mounted to exhaust line of the engine. Main advantages of this method over the fumigation and emulsified fuel techniques, corrosive side effects of water on metallic surface have been eliminated by changing the phase of compressed hot water at 300 kPa and 133°C to superheated vapour conditions at 101·325 kPa and inlet temperature. Optimum steam rate was obtained as 20% from the performance and the exhaust emissions points of view. The test results obtained from the partial load conditions are given comparatively. In a wide speeds and engine loads intervals, while the effective brake power and the efficiency increased, specific fuel consumption and NOx emission decreased.
This work has been supported by The Scientific and Technological Research Council of Turkey and was performed within The Support Programme for Scientific and Technological Research Projects (1001) with the project number of 108M261 and the project number of 110M065.