PURPOSE: To evaluate a difference in the particle concentration of the powder in a high-concentration supply pipe and to remove a measurement error by providing a detection pipe for taking part of powder within a prescribed concentration range out of piping and returning it to the piping after light transmission is detected.
CONSTITUTION: The pulverized coal supply amounts of plural pulverized coal supply pipes 100a-100c are varied by opening/closing valves 101a-101c, and irregular particle concentration distributions generated in the supply pipes 100 are uniformed by particle concentration uniforming devices 102a-102c. Then detection pipes 103a-103c sample part of particles in the supply pipes 100 and particle concentration meters 106a-106c as detecting means detect the particle concentration. A signal processor 107 calculates the ratios of the intensity values of light photodetected by detectors 105a-105c to the intensity values of incident light from projectors 104a-104c. Then the intensity ratios are compared 108 and an opening extent regulator 109 adjusts the opening/closing valves 101 to equalize the intensity ratios of the respective pipes.
| JP5440707 | PM detector |
| WO/2018/076405 | DUST MEASUREMENT DEVICE |
AZUHATA SHIGERU
NARATO KIYOSHI
MASUTANI MASAO
ARASHI NORIO
MORITA SHIGEKI
BABCOCK HITACHI KK