Kinetic study of the effect of sub-atmospheric conditions on the laminar burning velocity of high C2H6 content natural gas mixtures

The laminar burning velocity (SL) was measured at sub-atmospheric pressure (0.84
atm) and an environmental temperature of 295 ± 2K for two high C2H6 content
fuel mixtures, 75% CH4 – 25% C2H6 (mixture M1), and 50% CH4 – 50% C2H6
(mixture M2), as well as the pure constituent fuels. The equivalence ratios for the
experiments ranged between 0.8 and 1.4. Numerical calculations predicting SL were
performed using 3 detailed reaction mechanisms, finding GRI-Mech 3.0 to achieve
the best agreement at the pressure conditions evaluated. The pre-exponential factor

Experimental and numerical study of the effect of water injection into the reaction zone of a flameless combustion furnace

The effect of water injection on the stability and emissions of a flameless combustion regime was evaluated. Flameless combustion operation was studied without self-regeneration, with self- regeneration, and with combustion air oxygen enrichment. For each case, increasing water flows were injected until the combustion regime was unstable. The evaluation criteria were temperature uniformity and pollutant emissions of species such as carbon monoxide and nitrogen oxide.

Analysis of potential energy savings in a rotary dryer for clay drying using data mining techniques

Clay drying is one of the most important steps in the construction materials industry. Due to its high-energy requirement, clay drying is one of the most energy-consuming processes contributing to greenhouse gas emissions, motivating the search for strategies to increase the energy efficiency of the process.

A numerical analysis of the effect of atmospheric pressure on the performance of a heating system with a self-recuperative burner

This work evaluated the performance of a combustion chamber operating with a self-recuperative burner at various atmospheric pressures by means of Computational Fluid Dynamics (CFD) simulation. The aim was to determine the effect of atmospheric pressure on the main variables of the combustion system through mathematical correlations and numerical simulations.

Effect of the turbulence intensity on knocking tendency in a SI engine with high compression ratio using biogas and blends with natural gas, propane and hydrogen

This research presents the test results carried out in a diesel engine converted to spark ignition (SI) using gaseous fuels, applying a geometry change of the pistons combustion chamber (GCPCC) to increase the turbulence intensity during the combustion process; with similar compression ratio (CR) of the original diesel engine; the increase in turbulence intensity was planned to rise turbulent flame speed of biogas, to compensate its low laminar flame speed.

Effect of the burner position on an austenitizing process in a walking-beam type reheating furnace


An analysis of the effect of burner location on the performance of a walking-beam type reheating furnace for an austenitizing process is presented in this work. Four configurations were evaluated, where the main difference was the position of four high-speed self-recuperative burners. The analysis was done through computational fluid dynamics (CFD) simulations, using a set of models suitable, and previously validated, to consider combustion, heat transfer, and billet heating, all in a 3D steady-state calculation.

DECOG - A dual fuel engine micro-cogeneration model: Development and calibration

The use of gaseous fuels in compression ignition (CI) engines for cogeneration allows diesel substitution and particulate matter reduction, however, power efficiency is reduced while CO and THC emissions are increased at part-load conditions. The development of micro-cogeneration systems based on dual fuel engines requires the actual heat recovery estimation, which in turn depends on the power efficiency in all operating range. In this paper, the development of a dual-fuel engine cogeneration model (DECOG) based on International Energy Agency-Annex 42 methodology is presented.

Experimental Evaluation of the Surface-Stabilized Combustion of a Confined Porous Inert Media Burner

This paper presents an experimental study of the characteristic parameters of the surface-stabilized combustion of a confined porous media burner with premixed methane/air flames. Parameters such as the stability range, emissions, and temperature profile of the confined porous medium were evaluated using a burner with geometric features that resulted in gas recirculation due to backward-facing step flows. An analysis of the flame morphology using the OH-planar laser-induced fluorescence technique was also conducted to determine the flame height with respect to the porous medium surface.