Boiler pulverized-coal sampling fineness on-line measurement method and apparatus

The present invention relates to a boiler pulverized-coal sampling fineness on-line measurement method and apparatus. The apparatus comprises a mechanical transmission unit for providing mechanical power and transferring the mechanical power, a sampling unit, a photoelectric conversion unit, and a data acquisition and processing unit, the mechanical transmission unit comprises a rotator located inside a boiler tube and a motor located outside the boiler tube, the sampling unit is driven by the mechanical transmission unit, is used for extracting a boiler pulverized-coal sample, and comprises a sampling probe which is located on the rotator and rotates along with the rotator, the photoelectric conversion unit is connected with the sampling unit, and comprises a light source, detection area and a photoelectric conversion device, the light source is used for illuminating the extracted boiler pulverized-coal sample, the photoelectric conversion device is used for converting an optical signal of the extracted boil