On the issue of calculating air supply duct networks taking into account the performance specifications of pneumatic tools equipment
Abstract
In mining practice, one often has to deal with the design and operation of complex air duct networks. Currently, there are several technical and techno-economic methods for their calculation. For practical calculations, it is more convenient to use the nomogram located at the end of the article (see article). Using this nomogram greatly simplifies the selection of a duct and the calculation of all network elements. The advantage of the nomogram also lies in the fact that we can easily find from it the equilibrium states in the air duct when the pressure at the beginning of the calculation section is specified, but we do not know the mutually interconnected pressure that will be established at the receiver, the air flow rate and the pressure loss on this section. It is quite obvious that now we cannot allow a free choice of the speed of air movement in the duct; considering the issue from the point of view of minimum economic costs, we are obliged to: find an equilibrium state in which a certain pressure at the receiver, air flow and pressure losses determined by the pressure at the beginning of the element and the diameter of the duct will be established; this problem of finding an equilibrium state in an air duct is solved using a nomogram through several trials.
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