Research on Adaptation of Multi-Criterial Electro-Optical System under Object in the Form of Belt Roadway of Coal Mine for Fire Control

The research was carried out to adapt a multi-criterial electro-optical system under the object in the form of the belt roadway of coal mine for fire control. The study was carried out based on computer simulation in the Fire Dynamics Simulator. Approach was determined for the placement of CO and CO
2
concentration sensors and flame sensors. Approach ensure the minimum time for fire detection after reaching the maximum permissible CO concentration of 0.0017% vol. and by exceeding the CO/CO
2
concentration ratio of the threshold of 0.03. Flame sensors are placed at points in the belt roadway with the highest values of registered irradiance. Fire scenario during ignition from friction of conveyor belt was considered for the airflow velocity Va from 0.5 to 4 m/s. The CO and CO
2
sensors are placed as close as possible to the roof in the burning zone of conveyor belt. The distance from the CO and CO
2
sensors to the likely place of fire is set taking into account the influence of airflow velocity Va on the distribution of CO and CO
2
in the space of belt roadway. The distance from the CO and CO
2
sensors to place of fire is set from 5 to 17 m for Va from 1.5 to 4 m/s. CO and CO
2
sensors are located under the roof at distance of 100 to 300 m from each other in the linear part of belt roadway. This provides the detection time of no more than 600 s for Va from 0.5 to 4 m/s. The CO and CO
2
sensors are placed in pairs under complex control using the CO/CO
2
ratio. Flame sensors are oriented in the direction of airflow. Flame sensors are located in area with low concentration of combustion products at the height of 1.6 m from the floor and at the distance of 1 m from the place of ignition. The error of situations prediction by NAR type neural network was estimated. Error of prediction for the alarming situation does not exceed 19%, for the pre-emergency situation does not exceed 20%, for the emergency does not exceed 20%.