Justification of methodical approaches to determining the theoretical fuel combustion temperature in a blast furnace when changing the parameters of the melting mode
DOI:
https://doi.org/10.62911/ete.2023.01.02.09Keywords:
theoretical combustion temperature, blast, natural gas, pulverized coalAbstract
Based on the study of the practical experience of blast furnace smelting with the injection of pulverized coal fuel on a blast furnace with a useful volume of 5,000 m3, the causes of frequent cases of deformation and burning of air nozzles and coolers were determined. In particular, such reasons include a significant unevenness of the length of the combustion zones in front of the tuyeres around the mine circle and an irrational change in the gas flow distribution along the blast furnace radius. In turn, this is due to the presence of a large unevenness in the distribution of the costs of blowing and pulverized coal fuel along the tuyeres, and therefore the theoretical temperature and output of mine gas along the circumference and radius of the mine blast furnace. Therefore, when determining the possible consumption of any fuel additive, it will be difficult to focus on the value of the theoretical combustion temperature, as a complex parameter of the fuel regime, which characterizes the temperature-oxidative conditions of the transformations of fuel additives in the nozzle cells. This especially applies to the known methods of determining this parameter, which are not sufficiently reliable in case of significant fluctuations in the input melting conditions. The purpose of this work is to develop methodical approaches to determine the theoretical fuel combustion temperature based on the actually controlled blowing parameters when natural gas and PUT are blown into the blast furnace on the basis of stoichiometric ratios and fuel technical analysis data. A method of determining the theoretical combustion temperature in the tuyere when natural gas and/or pulverized fuel is blown into the blast furnace is proposed, using operational information about blowing parameters, consumption of natural gas and pulverized fuel, which are taken from control and measuring devices and automation systems at the central control panel of the blast furnace. On the basis of the developed method of determining the output of mine gas and the theoretical temperature of fuel combustion, it is possible to solve practical problems related to the optimization of blast parameters of blast furnace smelting, as well as when blowing pulverized coal fuel.
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