On-line Monitoring of Electrostatic Field Strength in Powder Pneumatic Transportation Process Using Newly Developed Electrostatic Field Detecting System.

Feedback Control of Electrification in Powder Pneumatic Conveying Process [Translated]^†

“…Figure 2 illustrates measurement principle of a developed electrostatic field strength sensor [6,7]. The sensor is installed inside a stainless cylinder (i.d.…”

“…( 7). u(t)҃K P Ά e(t)ѿ ͐ t 0 e(t)dtѿT D · (7) In the case that the transfer function is described by the first order lag element including the dead time, each parameters of PID controller can de determined by a method proposed by Ziegler and Nichols ( Table 1) [10].…”

“…In order to prevent these hazards beforehand, development of continuous motoring and practical control system of powder electrification is strongly required. So far, we have developed a novel electrostatic detecting system based on the measurement of electrostatic field strength, and tried to apply to fluidized bed drying and pneumatic conveying processes to continuously monitor the powder electrification [6][7]. We also have developed a corona-discharge type electrostatic neutralizer to remove electrostatic charge of powders during pneumatic conveying of powders into a silo [8].…”

On-line Monitoring of Electrostatic Charge in Powder Pneumatic Transportation Process [Translated]^†

“…(8) is applied to the current of powder (h), h can be expressed by the product of the space charge density and the air flow rate. (10) According to the Gauss's theory, total charge Q is expressed by using electrostatic field strength E, dielectric constant of air Eo and cross sectional area of the pipeS…”