Air Leakage Technology of Micro Positive Pressure Sealing by Nitrogen Injection in Connection Roadway

Abstract

To control the coal spontaneous combustion in the goaf of working face effectively, through the connection roadway between the main transport and auxiliary transport in the working face, a sealing gas chamber is formed by the rapid airtight and structural airtight. The air pressure pipelines are installed outside the closed structure to observe the pressure difference between the sealing air chamber, goaf and working face roadway. Nitrogen is injected into the sealing air chamber through the nitrogen injection pipeline to keep the sealing air chamber in the state of micro positive pressure. The sealing air chamber of micro positive pressure can control the “breathing” effect of goaf caused by the air pressure fluctuation, as well as reduce the air leakage and the width of oxidation zone. The method can prevent coal spontaneous combustion of the goaf, and control the low oxygen and the abnormal emission of toxic and harmful gases like CH4, CO in the return wind corner of working face.

Keywords

• connection roadway
• sealing gas chamber
• micro positive pressure
• breathing effect
• air leakage