通気網管理に関する基礎的研究
1984 年 100 巻 1152 号 p. 73-78
詳細
1984 年 100 巻 1152 号 p. 73-78
It is very important to keep good conditions of air flow rate in the deep and/or complicated underground roadway network of coal and metal mines in the both aspects of safety and economy.
In this paper, a method to analyze underground mine ventilation network concerning natural ventilation pressures, booster fans and regulators is explained, and some fundamental factors for mine ventilation control are discussed.
The main results are as follows;
1) To measure temperature at every intake and outlet node in a ventilation network is important for estimation of airflow rate through branches because natural ventilation pressures are dependent on the temperature at intake and outlet nodes as temperature distribution in the underground roadway network is constant.
2) To keep same condition of a branch having large energy cosumption in aerodynamic resistance is one of the factors for stable working of the main fans since when aerodynamic resistance of a branch ‘k’ in a network becomes twice, airflow rate at the main fans decreases, and the difference in airflow rate at the main fans between first condition and second one is proportional to energy consumption in the branch k at the first condition.
3) A relation between airflow rate Qp through a certain branch ‘p’ and aerodynamic resistance Rq of other branch ‘q’ can be represented in the following experimental equation.Qp=A (Rq/B+Ro/B) -n+Qo whereA, Ro, n and Qo are constant co-efficients having dimension (m3/s), (μ), (O) and (m3/s) respectively, and Bis 1μ for making values in round brackets dimensionless.
