Research progress in hydrogen-doped natural gas combustion technology

Hydrogen has gained widespread attention due to its advantages of cleanliness, green attributes and renewability. However, there are still certain obstacles to its use as a fuel because of the high costs of storage and transportation, the low volumetric calorific value and the immature core technology of combustion. Hydrogen doping in natural gas is an effective way to achieve the "dual carbon" goal in the gas field, capable of combining the advantages of natural gas and hydrogen, and optimizing the combustion characteristics and emission performance of the fuel. Herein, the global research status of hydrogen-doped natural gas was summarized starting from the research on hydrogen-doped natural gas pipeline transportation technology and gas interchangeability based on the literature research at home and abroad. Meanwhile, the basic research and application status of hydrogen-doped natural gas combustion technology was sorted out, and the development direction of hydrogen-doped natural gas combustion technology was predicted. The research results show that hydrogen embrittlement in pipelines, increased NO_x emissions and decreased flame stability caused by hydrogen doping, as well as the unsound laws and regulations, are the main bottlenecks restricting the application of hydrogen doping technology of natural gas at present. Therefore, it is urgent to overcome the problems about the compatibility of hydrogen pipelines, understand the combustion mechanism of hydrogen-doped natural gas, and establish and improve the relevant standards of hydrogen-doped natural gas and its combustion. Generally, the research results could provide technical reference for the basic research and application of hydrogen-doped natural gas combustion technology, facilitating the gas field to achieve low-carbon and sustainable development.