Device and method for measuring charge characteristics of particulate matters in ion flow field

Abstract

The invention relates to a device and a method for measuring charge characteristics of particulate matters in an ion flow field, and belongs to the technical field of ion flow fields, field-induced charge parameters are determined by using a least square method according to the synthetic electric field intensity of a lower polar plate when the ion flow density is zero, and the field-induced charge space charge density of the particulate matters is determined according to the field-induced charge parameters; according to the field-induced charge parameter, the plurality of ion current densities and the synthetic electric field intensity of the lower polar plate corresponding to each ion current density, the diffusion charge parameter is determined by using a two-dimensional particle swarm algorithm, so that the particle diffusion charge space charge density is determined according to the diffusion charge parameter, and simultaneous measurement of field-induced and diffusion charge characteristic components is realized.

Description

technical field [0001] The invention relates to the technical field of ion flow field, in particular to a device and method for measuring the charging characteristics of particles in the ion flow field. Background technique [0002] Aiming at the problem of uneven energy distribution, a transmission network including UHV DC transmission lines is gradually established. The surface field strength of UHV DC transmission line conductors has exceeded the limit of air ionization, which will cause corona discharge around the conductors. Compared with UHV AC transmission, the space charge generated by UHV DC transmission will be scattered in the space around the wire and the ground, forming an ion flow field problem. The space charge generated by the corona will combine with space particles due to its own thermal motion and the effect of the space electric field to form charged particles, that is, diffusion charging and field charging. Charged particles can cause distortions in th...

AI Technical Summary

Problems solved by technology

Charged particles can cause distortions in the surrounding electric field, complicating the flow of ions

The composition of particulate matter in natural space is relatively complex. In addition to the mass concentration, it is difficult to achieve real-time measurement of parameters such as particle size, dielectric constant, and mass density. Therefore, it is impossible to directly predict the field-induced and diffusive charging characteristics of particulate matter through the particulate matter charging model. and analysis

At the same time, the existing method for measuring the charging characteristics of particulate matter can obtain the total charge amount of particulate matter, but cannot obtain the field-induced and diffusive charge components.

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