Capacitance measurements of solid concentration in gas–solid flows

Concentration measurement with thermal probe for pulverized coal in the pneumatic pipeline of power plant

“…The other is the mass-dependent category in which the signals output from concentration sensors are primarily dependent on the change of solid/gas mass flow ratio. The capacitive method [3][4][5][6], electrostatic method [7], electromagnetic method [8], optical method [9], acoustic method [10,11] and radiometric method [6,12] are volume-dependent ones. The Coriolis method [13], pressure drop method [6,14], gravimetric method [15,16], and thermal method [17][18][19] belong to the mass-dependent category.…”

Direct Measurements of Instantaneous Solid Flux in a CFB Riser using a Novel Multifunctional Optical Fiber Probe

“…Various measuring techniques were employed to measure the three parameters in CFBs. For example, the optical fiber probe [1][2][3], capacitance probe [4,5], LDV/LDA, and imaging system [6,7] were used to measure solid concentrations and particle velocities. Optical fiber and suction probes [8][9][10] were used for measuring local solid mass fluxes.…”

The equivalent electrical permittivity of gas-solid mixtures at intermediate solid volume fractions.

“…In both cases, a mixture model must be used to convert measured impedance to material distribution. Recent work in developing an EIT system [25] suggested that the accuracy of mixture models be investigated.…”

“…The present work involves gas-solid flows in a circulating fluidized bed (CFB) riser, to which a 16-electrode EIT system is applied [25]. The CFB contains dielectric particlesglass spheres or fluid catalytic cracking (FCC) catalystfluidized with air, so only the capacitive component of impedance is considered in this work.…”