安全工程專業(yè)英語翻譯-文庫吧資料
2024-11-08 09:33本頁面
【正文】 es such as virgin rock temperatures, spontaneous bustion and dust control further plicate theoretical ventilation systems. Moreover, whatever system is eventually planned will inevitably suffer from imperfect implementation and control because of the daytoday plexities of the extraction operation. “Ventilation in the modem mine is an essential prerequisite, perhaps even more so than in the from the obvious biological aspect of preventing depletion of oxygen and the buildup of carbon dioxide in the air, the mineventilation system must be able to keep quantities of contaminants below harmful levels,” says Mike Beare, principal mining engineer for consultancy SRK. He explains: “A modern mine has many sources of harmful substances, including fumes from explosives, dust from broken rock and gases present in the rocks themselves. in addition to these, the modem approach to mining (including the use of dieselengine trucks and loaders) results in large quantities of CO, nitrous fumes and dieselparticulate matter entering the mine airflow. While scrubbers are fitted, they do not remove all the contaminants and the ventilation system has to be designed to be able to dilute these to safe levels.” These issues demonstrate the need for expert design, observes SRK, which also signals the need for ventilation costs to be minimised in the same way as any other cost aspect As a result, various production scenarios need to be addressed at the outset. Central to all of these calculations is the simple fact that airflow is determined by temperature and pressure differences, air flows from highpressure to lowpressure areas . In a mine, It is caused by pressure differences between the intake and exhaust openings. Airflow follows a squarelaw relationship between volume and pressure in order to double the volume of air, four times t
畢業(yè)設計相關推薦
鄂ICP備17016276號-1