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Ensuring Safe Working Conditions during the Operation of the Closed Coal Storages

It is noted that the relevance of the presented studies is related to the need in reducing the aerotechnogenic load on the environment, which, when the coal is stored in the open storage, is practically uncontrollable that leads to the dust pollution of the significant territories. It is shown that ensuring safe operation of the closed coal storages, which are an alternative to the open coal storage, is possible if two conditions are met: the concentration of methane released from the coal stack in the air space of the storage does not exceed the permissible values; reduction to the required level of emissions of coal dust generated during loading and unloading technological operations. The reasons for possible release of methane from the stored coal associated with its residual methane content, the value of which is determined both by the initial value, as well as its decrease during the transportation of coal from the place of its production to the closed storage were identified. It is shown that in order to prevent exceeding the permissible value of methane concentration in the closed storage, it is required to use forced ventilation with an air exchange rate of at least two. It is mentioned that the forced ventilation in combination with the significant volumes of coal dust generated during technological operations can result in an increase in its concentration to the values hazardous for the human health. The analysis of methods for normalizing the dust environment during the operation of closed coal storages is given. The scientific novelty of research is associated with a comprehensive study of the regularities of aero-, gas- and dust-dynamic processes that determine safety of operation of the closed coal storages.