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Kawasaki - Low Emission Technology
Kawasaki gas turbines provide customers with clean energy for the purpose of global environmental protection. Nitrogen oxides (NOx) contained in the exhaust gas are the cause of photochemical smog and acid rain. Kawasaki low emission combustion technologies dramatically reduce NOx in the exhaust gas, significantly reducing the environmental burden.
DLE Combustion Method
NOx is produced under high-temperature conditions during combustion*. With Kawasaki DLE (Dry Low Emission) combustion, world-class low NOx performance below 10ppm (O2=15%) is achieved by combining our own development of “Lean Premixed Combustion” and “Supplemental Combustion” systems.
The Kawasaki lean premixed combustion method evenly mixes the fuel with air prior combustion. This system greatly reduces NOx by achieving a uniform temperature distribution without causing local high temperature area.
The Kawasaki supplemental combustion method, a distinguishing feature of Kawasaki DLE combustor, adds fuel downstream from lean premixed combustion. Adjusting the amount of supplemental fuel controls the output while keeping the lean premixed combustion stable. As a result, the Nox emissions are stable and can be maintained at a low value.
The Steam/Water Injection method is often used with Fuels that have a wider range of heating values or composition. The Steam/Water Injection method achieves low NOx levels combining steam/water injection with the ordinary diffusion combustion. With this conventional approach, combustion is carried out by directly injecting fuel into the combustor, without mixing it with air in advance. By injecting steam or water with the fuel, it is possible to reduce the combustion temperature, and lower the production of NOx emissions**.