Application of Electrical Capacitance Tomography in Pneumatic Conveying of Pulverized Coal

On-line detection of pulverized coal concentration, speed and the mass flow are of great importance for safety, environmental protection and energy conservation in industry of power plant boiler, which is also a hot spot research for boiler study. This paper introduces the application of electrical capacitance tomography in pneumatic conveying of pulverized coal. An 8-electrode ECT system including both hardware and software is developed. The hardware of this ECT system consists of sensors optimization, small capacitance measurement circuit, data acquisition control module based on DSP. AC-based capacitance measuring circuits is adopted in this paper which have advantages of high speed response, stray-immune, low drifting, etc. Software of imaging reconstruction computer is described. This ECT system has been designed on modularization configuration to be conveniently used in industry field. Moreover, the signal long-distance transfer, imaging speed and the problems in practical industry applications are considered.