| 摘要 |
PURPOSE:To monitor the spontaneous ignition of an open-air storage of coal by providing reciprocating scanning of temperature with a radiation thermometer in the longitudinal direction of the middle height of an open-air coal storage and comparing average temperatures at points in advancing scanning and those in the returning scanning. CONSTITUTION:A radiation thermometer 21 is reciprocated to scan with a predetermined width on one side that is positioned at the middle point 1a of the height of an open-air coal storage 1 over its length to measure temperature at various points. An arithmetic unit 3 calculates the outputs of radiation thermometers 21... 2n and generates alarm signals 41... 4m at measurement points in the longitudinal direction of the middle point 1a of a coal storage 1. With those devices in the scanning of one reciprocation at the middle point 1a of the open-air coal storage average temperature of temperatures at various measurement points in the advancing scanning is calculated by the arithmetic unit 3 and in the returning scanning the temperatures of various measurement points are compared with said average temperature and if the difference of temperature between a predetermined point and the average temperature exceeds a specified value, alarm is sounded with regard to its location. |
