| 摘要 |
PURPOSE:To enables quick detection of the presence of blocking of a coal feed pipe, by a method wherein the coal feed pipe is previously divided into pipe groups, the temperature of each coal feed pipe in a pipe group is detected, a difference between the average temperature of the coal feed pipes in the pipe group and the temperature of each pipe is determined to compare it with a set temperature difference range. CONSTITUTION:A coal feed pipe 8 of a fluidized-bed boiler is previously divided into pipe groups, and a temperature sensor 12 is located between a nozzle 11 of each coal feed pipe and a multispliter 7. Fuel coal 1, introduced to each coal feed pipe, is blown out in a fluidized bed 10 through the nozzle 11. Such operation is continued during operation of a fluidized-bed boiler 9, and during the operation, the temperature of each coal feed pipe is detected at intervals of a given time by the temperature detecting sensor 12. The temperature signal is inputted to a computing device, and the average temperature of each pipe group is calculated. In the computing device, a previously set temperature difference range, being applicable to each pipe group, is stored. When a difference between the temperature of each coal feed pipe 8 and the average temperature of each pipe group exceeds the temperature difference range, the coal feed pipe is decided to be blocked, and with shut-off valves 14 and 15 shut off, a lodging substance present between the valves is removed. |
