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The measurement accuracy of the estimation of the Doppler frequency and the signal phase difference in Phase Doppler Anemometry (PDA) systems is investigated in this paper by taking into account the effect of the particle trajectory via the measurement volume and the different noise sources. Both the signal dependent (quantum shot) noise and the signal independent (thermal and dark current) noise...
The ability to monitor the velocity and concentration profiles for the whole diameter of a pipe would allow the complex flow dynamics associated with particles in a pneumatic suspension to be measured. This paper presents a method of online monitoring of the particle velocity and particle concentration for the whole diameter of the pipe for a pneumatic bulk solid conveying system. This is achieved...
On-line continuous particle sizing plays a vital role in many industrial applications in various fields, for instance, particulate emission monitoring, drug delivery, atmosphere monitoring and painting [1]. The size, velocity and concentration of pulverized fuel used in an electric power plant are important parameters that affect both combustion efficiency, potentially increased safety risks and atmospheric...
The pneumatic conveyance of granular or pulverised materials is widely seen in many industries. The size distribution of pneumatically conveyed particles should be monitored to ensure product quality, improve process efficiency and reduce atmospheric emissions. For instance, particle size distribution of pulverised fuel in the power generation industry is an important parameter in relation to combustion...
Coal-fired power stations are burning an increasingly diverse range of fuels, including biomass and coals of varying compositions, under tight economic and environmental constraints. Since existing coal fired plants are not designed to burn such a diverse range of fuels, power generation companies are facing combustion problems such as poor combustion efficiency, high atmospheric emissions and potentially...
Cross-correlation methods in combination with electrostatic sensing technology offer a promising solution to the on-line continuous measurement of velocity of particulate solids in pneumatic pipelines. The sampling frequency and integral time are two fundamental parameters in cross-correlation calculation. This paper describes the principles and steps of the selection of these two parameters. The...
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