Natural gas

Process (computing)

Engineering

Accounting

Operating system

Computer science

Gas engine

Business

Physical chemistry

Waste management

Thermodynamics

Hydrogen

Physics

Nuclear engineering

Organic chemistry

Combustion

Valuation (finance)

Automotive engineering

Process engineering

Environmental science

Fossil fuel

Chemistry

International Journal of Hydrogen Energy

The approach of fossil fuel substitution requires alternative strategies in the progressing sector coupling of energy storage, distribution and conversion. Promising solutions are flexibly supply chain models of green and blue hydrogen which is fed into the natural gas network (HNG). Prerequisite for a successful implementation is the functional capability of end-use applications for which different volumetric hydrogen thresholds are documented in literature. A clear research gap is thereby evident for HNG fired medium-speed large-bore gas engines typical used for stationary power generation. For solving this problem, generic single cylinder tests with focus on operating window, NOx formation and hydro-carbon emissions have been carried out. The results are analysed and compared to available publications of HNG fired high-speed gas engines to derive general insights of the combustion characteristics. Under rising blending share, an in literature described, general shifting of the possible operating window and an increase of NOx formation are detected. In terms of unburned hydrocarbons, a NOx-neutral reduction potential through hydrogen blending is only visible under very lean operating conditions. This result deviates from expected literature values of high-speed engine setups. The experimental study demonstrates the NOx neutral combustion capability of medium-speed large-bore gas engines under 20% hydrogen admixture.

Quantitative valuation of hydrogen blending in European gas grids and its impact on the combustion process of large-bore gas engines