EXPERIMENTAL STADY OF THE THERMOTECHNICAL CHARACTERISTICS OF FLAMES DURING THE COMBUSTION OF HYDROGEN-CONTAINING MIXTURES

The thermal characteristics of flames during the combustion of methane-hydrogen mixtures with a change in hydrogen concentration from 0 to 100 % were investigated. Experimental studies of the features of the combustion of hydrogen-containing mixtures in a Bunsen burner in an open space with incomplete preliminary mixing of gas with air were carried out. The following features of the combustion of gaseous hydrogen-containing mixtures with an increase in the hydrogen concentration in them and with an unchanged burner power are noted: a reduction in the length of the torch by 22 %, an increase in its temperature and an increase in the heat flux from the torch by up to 25 %. Visual observations have shown that the torch of combustion of a hydrogen-containing mixture at a primary air flow rate of 0.42 to 0.54 sec is stable up to and including a hydrogen concentration of 90 %. It is assumed that the reddening of the torch with an increase in the hydrogen concentration in the fuel from 60 % can be considered a characteristic feature of the combustion of hydrogen-containing fuels. It has been confirmed that replacing natural gas with hydrogen can be a promising direction for reducing fossil fuel consumption, and adding hydrogen to fuel gas can increase the efficiency of heat transfer from the torch to the heated bodies. Bibl. 30, Fig. 6, Tab. 2.