通気の温度予測式の改善

採炭切羽の通気温度に関する研究 (第2報)

抄録

Lately coal mining operations have been carried out in deeper levels. As a result, high rock temperature has caused temperature increase of a working face. The improvement of coal mining productivity requires both theoretical analyses for the face temperature increment and appropriate cooling measures of working area.
A. H. proposed an theoretical equation to calculate a face temperature by solving a differential equation of enthalpy balance. His solution process, however, was not sound in view of mathematical analysis. Therefore authors improve the process and proposed a newly derived equation for the analysis of the face temperature. This paper showed that difference between differential humidity ratio of conventional equation (dw) and that of new one (dw) considerably increased with increment of the face temperature. Differential humidity ratio is an important factor to effect on the face temperature increase in the differential equation. This means that the error with conventional equation cannot be neglected if the temperature is high. The newly proposed equation can more accurately describe the temperature increase in the wide range of temperature. This paper also calculated two constants, modified heat transfer coefficient and specific oxidation heat, by substituting some measured data, temperatures and relative humidities at both inlet and outlet of the face etc. into this equation. These calculated values were reasonable comparing with many data measured before.
Furthermore, the newly derived equation was verified by simulations that describe the same heat transfer problem. The calculated temperature at outlet of the face by this equation was in good agreement with the simulated results, while the equation derived by didn't coincide with the simulated temperatures.