Study On The Design Of Hydrogen Micro-mixed Combustor Head And The Combustion Characteristics

Under the background of the dual-carbon goal,China’s energy consumption structure urgently needs to be adjusted to reduce the use of fossil energy.The use of clean and pollutionfree energy has become an important way to achieve the dual-carbon goal.Hydrogen energy is attracting more and more attention and usage due to its green,renewable,storable,and exchangeable characteristics with electricity.Hydrogen gas turbines,as the terminal equipment for hydrogen power generation,will play an important role.One of its core components,the hydrogen combustors of the hydrogen gas turbine,is crucial for clean electricity generation.Therefore,major domestic and foreign manufacturers have started research on the hydrogen combustion ability of traditional gas turbine combustors.The results show that most of the traditional natural gas turbine combustors have a hydrogen combustion capability of around30%,and some combustors can combust 60% hydrogen after adaptiving modifications.However,in order to achieve zero carbon emissions,it is necessary to use pure hydrogen as the combustor fuel.Therefore,the development and design of the combustor of hydrogen gas engines has become a research hotspot.This thesis focuses on the current research status of hydrogen combustion in gas turbine combustors,summarizes and analyzes the current mainstream hydrogen combustion technologies,and carries out the design work of hydrogen combustion chambers.The specific tasks are as follows:(1)Based on the Chemkin software package,the kinetic characteristics of the chemical reactions of methane-hydrogen mixed fuels were studied,and the changes in the kinetic parameters of different hydrogen blending ratios were analyzed.Predictions were made on the possible problems encountered in hydrogen combustion.(2)The study focused on the natural gas-hydrogen mixed fuel combustion characteristics of the combustor formed by combining the head of the natural gas tower coaxial staged combustor with the chamber and casing of an industrial combustor.The results indicated that the combustor underwent significant tempering after the hydrogen blending ratio exceeded 35%.This result indirectly verified the necessity of designing a pure hydrogen combustion chamber head.(3)This study focuses on investigating the effects of various structural parameters of a micro-mixing single tube structure on mixing uniformity.By combining single-factor analysis and DOE experimental design,a predicted model for the effects of each parameter on mixing length is provided.The response is then optimized to obtain the optimal structural parameters.The impact of different operating conditions on the mixing and combustion characteristics of the micro-mixing single tube are also analyzed.The results demonstrate that the micro-mixing single tube structure has a significant impact on the mixing uniformity,and the optimized parameters can improve the combustion efficiency.The findings provide valuable insights into the design and optimization of micro-mixing single tube structures for combustion applications.(4)The optimization of a micro-mixing unit structure array for a hydrogen fuel micromixing combustion chamber head is investigated,exploring the effects of variables such as array number and micro-mixing tube spacing on chamber performance.The impact of each parameter on combustor performance is analyzed.Based on the influence laws of different parameters on the combustion characteristics of the multi-pipe micro-mixed combustor,obtain a head model of the micro-mixed multi-tube combustor that meets various technical indicators.In addition,different fuel grading schemes are provided for typical operating conditions to ensure efficient and low-emission operation of the combustor.