Optimization of dust concentration detection device based on electrostatic induction method

In order to solve the problem of large test error and poor anti-interference ability of the current electrostatic induction dust concentration sensor based on ring electrode for low-concentration dust, the detection electrode of the dust sensor has been improved, and the ring-shaped detection electrode has been changed to a plate-ring detection electrode composed of a ring electrode and a plate electrode. Through the establishment of three-dimensional finite element models of the ring-shaped detection electrode and the plate-shaped ring-shaped detection electrode, the spatial sensitivity of the two detection electrodes were calculated and compared by using COMSOL. The simulation re- suits show that there is an extra hump at the center of the plate-ring detection electrode compared to die ring-shaped detection electrode. The results prove that the spatial sensitivity of the plate-ring detection electrode is relatively high, which is beneficial to the detection of low-concentration dust. Then the influence of the structure size of the plate-ring detection electrode on its spatial sensitivity was analyzed, and the size parameters of the plate-ring detection electrode were determined. The diameter of the plate-ring detection electrode was set to 30 mm and the length was set to 40 mm. The plate-ring detection electrode induction signal processing circuit was designed, and a new type of electrostatic induction dust mass concentration sensor was developed by combining the plate-ring detection electrode, insulator, shielding layer and numerical signal processing circuit. Finally, according to die experimental results, compared with die electrostatic induction dust concentration sensor with ring electrodes, the signal-to-noise ratio of the plate-ring detection electrode electrostatic dust concentration sensor was increased by about three times, die resolution was increased by about two times, and die measurement error was reduced by 15% to 10%. The detection accuracy of the electrostatic induction dust mass concentration sensor was improved.lt promoted the application of electrostatic induction dust concentration sensors in coal mines, and improved die development of coal mine dust quality concentration detection technology. © 2022 China Coal Society. All rights reserved.