The invention relates to a method and a device for judging a
coal burning boiler on fire and time performance characteristics. The device comprises a temperature
measuring instrument, a cloud
deck, an alarm, an A / D converter and a data processor. The temperature
measuring instrument collects temperature signals at a certain rotation angle Theta range for a
coal dust
jet flow, a
characteristic length l and a characteristic temperature t can be calculated through the collected temperature signals, a critical characteristic distance l' and a characteristic temperature t' for reflecting ignition characteristics of the
coal dust air flow are measured on a design cost burning test under typical load, the
characteristic length l and the characteristic temperature t are compared with the
critical distance l' and the characteristic temperature t' to figure out the margin Alfa of the
coal dust ignition and time performance temperature, and the ignition and time
performance index Beta based on the
characteristic length of the frontal area of the
flame, and the
coal dust ignition and the time performance are judged according to the two parameters. The device is remarkably characterized in that how the operational parameters change need not to be detected, such as fuel characteristics,
wind speed at one time, wind density at one time, etc; the
coal dust area temperature field can be directly detected to quantitatively and conveniently judge current ignition state of the fuel, thereby placing a high value for boiler safety, economy, and stable operation.