Study on the feasibility of the micromix combustion principle in low NO H2 burners for domestic and industrial boilers: A numerical approach

Impact of H2/CH4 blends on the flexibility of micromix burners applied to industrial combustion systems

“…In contrast to the mentioned well established micromix burner design points, using hydrogen, hydrogensyngas and hydrogen-methane mixtures [32,34], the present paper investigates the feasibility of the micromix combustion principle (MCP) for industrial scale burners, which operate with lower air-fuel equivalence ratio (λ) levels and different power densities under atmospheric pressure [17,35,36].…”

“…To maintain a constant power density (since the same energy output is required despite varying the fuel mixture), it is necessary to increase the volumetric flow rate of hydrogen and reduce that of methane, as shown in the last column (volumetric flow rate ratio). Figure 2 summarises the previous research stages, which served as basis for the present work (1-2) [17], together with the research steps covered in the present study (3)(4) and the future steps that are expected to be taken (5). Thus, in order to achieve the desired energy density value at 14 MW/m 2 at λ, the present burner geometry was scaled, simulated and validated using pure hydrogen as described in our previous work [17].…”

“…melting furnaces. In this context, the present paper focuses on the use of hydrogen-enriched natural gas mixtures in micromix-type industrial burners, which differ from micromix-type gas turbines due to differences in operating conditions as highlighted in our previous study [17]. The choice of this type of burner will be further explained below.…”

“…For that purpose, a set of numerical simulations were carried out to assess the impact of different operating conditions at lower air-fuel equivalence ratios and different fuel blends at atmospheric pressure conditions. The employed modelling approach was validated in our previous work [17] using a laboratory-scale micromix burner prototype.…”

Thermodynamic Analysis of a Regenerative Brayton Cycle Using H2, CH4 and H2/CH4 Blends as Fuel

“…However, hydrogen is a very challenging fuel due to its combustion properties and differences with respect to conventional fuels such as natural gas, propane or kerosene. The current literature shows several investigations related to the behaviour of hydrogen flames focused on the flashback phenomena, as well as the thermal NO x formation [10][11][12][13].…”