CONTROL OF VENTILATION SYSTEM IN DEEP MINES

摘要

Restructuring process of the Polish miningindustry has in purpose to increase coal profitability. This leadsto output concentration and use of high-duty mining systems. Atthe same time, mines are united, and in case of unprofitablemines they are closed down that causes the simplification ofventilation network structure. As a result of changes often aconsiderable excess of air occurs in network and in consequenceincrease in natural hazard especially fire hazard in a coal mine.Therefore it is necessary to develop a hazards monitoring andmine ventilation control systems Power efficiency of ventilationsystems in Polish hard coal mines is usually very low. The highpower consumption of ventilation systems results from the ageof mines, air leakage and mining methods in use. Used in deepmines the main fans considerably exceed the real needs of themine. Most mines use uneconomical throttling on gates in orderto adjust a point of main fans operation to real requirements.This results in considerable energy losses and increasedventilation costs but some these factors can be eliminated Theproblems of ventilation control in deep mines were the subjectof many theoretical work, laboratories tests and undergroundexperiments (4), (5), (6). Recently the air distribution andenergy-saving control system of fans rotational speed bythyristor cascade has been developed to adapt the parameters toreal requirements during modernisation of coal mines. In thepaper, a way how to reduce the consumption of power used forventilation in Polish coal mines is discussed ft has been provedin practice that modernisation of ventilation systems in Polishcoal mines allows to save electric energy so the costs ofmodernisation are very quickly refunded. On the example of amine under liquidation (9), the paper discusses the operationaleffects of energy-saving control of the fan output, by regulatingthe fan rotational speed.