Abstract: In the design of automatic fire monitor system in large?scale closed coal storage yards, the automatic fire monitors arranged on the horse road are mainly affected by coal stacking and roof, and the design maximum protection radius is suppressed. But the relevant standards and literature lack corresponding countermeasures. Taking an example of a closed coal storage yard with 200,000 t of reserves in a certain place in Inner Mongolia, the influences of coal stacking and roof on the automatic fire monitors and countermeasures were studied. Firstly, the viewing angles of fire source detector in automatic fire monitor and jet trajectory characteristics were utilized to select the optimal layout area and height range of the automatic fire monitors in the direction of building width. Then, according to the maximum protection radius of the automatic fire monitor, determined the best position in the direction of building length. After that, the actual protective range of the automatic fire monitors was reviewed with the jet trajectory sprayed at an angle of 0°. Finally , the influences of coal stacking and roof on the automatic fire monitors were eliminated.

Key words: automatic fire monitor, closed coal storage yard, coal stacking, roof, shelter