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Abatement of NOx emissions from pulse detonation combustion

Introduction

For a reliable and sustainable energy supply, in addition to the further increase in the use of fluctuating renewable energy, a complementary operation of flexible energy conversion systems is crucial. A demand-driven and environmentally compatible operation of such systems can only be achieved through high load flexibility, ultra-low pollutant emission, utilization of alternative chemical energy carriers produced for energy storage, and significant increase in system efficiency. Gas turbine power plants have a potential to meet these challenging requirements, however, a further increase in efficiency of conventional gas turbines is only marginally possible.

Strategies

A change in the combustion concept from conventional isobaric to constant volume combustion (CVC) such as in pulse detonation combustion (PDC) promises a significant increase in gas turbine efficiency. Current research focuses on the realization of a reliable PDC and its challenging integration into a gas turbine. The topic of pollutant emissions from such systems has so far received very little attention.

Few rare studies indicate that the extreme combustion conditions in PDC systems can lead to quite high emissions of nitrogen oxides (NOx). Therefore, it is essential at this stage to already develop primary measures for NOx reduction during the development of this novel technology, if commercialization is to be feasible.

Goal

Few rare studies indicate that the extreme combustion conditions in PDC systems can lead to quite high emissions of nitrogen oxides (NOx). Therefore, it is essential at this stage to already develop primary measures for NOx reduction during the development of this novel technology, if commercialization is to be feasible. The goal of the present project is to quantify the NOx emissions from pulse detonation combustion and for the first time, evaluate the potential of different primary methods for reducing these emissions. Thereby, it is crucial to ensure reliable detonation combustion despite such changes in the process. The scientific approach is based on numerical and experimental investigations, thus, enabling a profound understanding of the underlying phenomena.

Method

The proposed work program provides a comprehensive experimental characterization of a hydrogen-fueled PDC regarding the NOx emissions and for the first time, gives an insight into the potential and limitations of the methods for NOx reduction based on exhaust gas recirculation and steam addition. The corresponding investigations will be carried out on a detonation tube under variation of relevant process parameters (temperature, pressure, combustible mixture).

A one-dimensional simulation of the PDC process will be performed for a broad range of relevant parameters using a finite-volume-code applying detailed chemistry. The simulation tool will be validated with extensive experimental data and represent an important result of the project that can significantly support the improvement of the PDC system.

Miscellaneous

This project is funded by Deutsche Forschungsgemeinschaftt since 2016. Project link

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