【正文】
nd machine OEMs should be acknowledged for their bined achievements. In reducing pollutants, there would always be a percentage of emissions that must be strictly monitored, diluted and vented to the surface. What is 3 needed is an alternative to diesel, and some people believe fuel cells could be the key. A 2020 study by the University of Nevada used data obtained from a survey sent to 173 US metal and nonmetal underground mines. From a 61% return, the survey included 4,786 diesel units (totalling 478,200kW), collectively consuming about 68MI/y of diesel fuel. As of January 20, the Mine Safety and Health Administration (MSHA) enacted a regulation limiting total DPM (diesel particulate matter) emissions from diesel engines to an Interim 450Ngm of total carbon/cm39。 of ambient air, and suggested it would be reduced further to 160pgm in January 2020. Extensive use of dieselpowered mobile equipment has resulted in the development of mining methods such as drift and fill stoping, which, in most circumstances, require ?deadend? auxiliary ventilation rather than 39。throughflow39。 ventilation. Since it can be harder and more expensive to ventilate these stopes, and meet the DPM regulations, most mines will have to modify their operating practices. Mines can exploit increased ventilation to help meet the DPM criteria, but this involves considerable costs since fan power Is proportional to cubicair quantity, and purchasing and installing fans is very expensive. So, perhaps the use of total emissionfree machines in our coal mines Is closer than we think. 4 井下通風 在礦業(yè)安全的方面沒有比合適的通風更重要,為了礦工的安全各種各樣的先進系統(tǒng)被用于保證風流的通暢。 布利弗里曼的觀點 當談到煤礦工作時,沒有什么事比適當的通風更重要。我們每年都要做很多工作來維護和改進工作空間的風流條件。為了將放射物控制在一定濃度范圍里,使空氣清潔,使污染物受到控制,為礦工提供必需的新鮮空氣。通風系統(tǒng)成為所有礦設計的一個關鍵因素,與煤炭儲量及地質條件、立法、可利用的人力資源、開采的方法和使用的設備等有關。 具體的環(huán)境問題如地溫、自燃和粉塵等使通風系統(tǒng)進一步復雜化。