Optimization of the combustion of pulverized coal through measurement and regulation of the coal mass flow
This report describes a new type of mass flow measuring instrument for coal dust, and its application in power plant engineering. The measuring accuracy, wearing properties and operating stability of this measuring instrument, based on the measuring principle, were optimised in the course of the project. The CORIOLIS-meter was tested at a pilot plant in which the different types of firing commonly used in coal-fired power plants (direct firing, indirect firing with interim bunker) were simulated and calibrated for both types of firing. It could be shown that the CORIOLIS-meter can detect on-line load changes in the supply of coal dust. Calibration tests confirmed the high degree of accuracy of the coal dust measurements, which were within 2 % of the current measured value. Preliminary experiments designed to apply the measured variable to a control loop, in order to regulate the coal dust mass flow/combustion air, were completed successfully. Coarse contaminations in the coal dust which could clog up the measuring instrument were safely transferred outwards by means of a vibrational sieve system using a bypass regulator. Long-term tests showed that the instrument's special wearing protection against the abrading action of the particles of coal dust was sufficient.
Bibliographic Reference: EUR 15490 EN (1994) 31 pp., FS, ECU 7
ISBN: ISBN 92-826-7827-X
Record Number: 199410976 / Last updated on: 1994-11-28
Original language: en
Available languages: en