基金项目:
国家自然科学基金(11205046;
51077035);
河北省自然科学基金(A2013201266);
Project supported by National Natural Science Foundation of China (11205046, 51077035), Hebei Provincial Natural Science Foundation of China (A2013201266);
In order to explore the best structure of needles to generate electric field that improves the efficiency of high-voltage electrostatic separation, we investigated the influence of the diameter of discharge needle on the performances of corona discharge by using a self-made novel needle-roller discharge device. A new measuring apparatus was used to measure the current on single discharge needle or multiple discharge needles. In order to get a better effect of discharge at the same voltage, discharge needles with even number among 35 needles were indented with five times in the experiment. The simulation of space electric field distribution of needle electrode based on the platform of MATLAB was realized by using the theory of electromagnetic field. The results show that when other conditions remain unchanged, the smaller the diameter of discharge needles is, the greater the total discharge current and the current on single needle will be. The discharge current increases first then decreases with the indent of discharge needle. When the length of indent is 15 mm, the discharge current and spatial electric field intensity reach the maximum. Thus the optimal structure of needle electrode is obtained. The simulation of electric field is consistent with the experimental results, which confirms the electric field enhancement of needles with even number to needles with odd number.
KEY WORDS :electrostatic separation;discharge current;current on single needle;corona voltage;simulation of electric field;
图3
排针―辊式放电装置侧视图
Fig.3
Side view for needle-roller discharge device
图4
放电针直径分别为1.0、1.6、2.0 mm,排针-辊间距h=60 mm的伏安特性
Fig.4
Volt-ampere characteristic of needle electrode when the diameter of discharge needle are 1.0 mm, 1.6 mm, 2.0 mm, and h is 60 mm
图5
电晕电压为33 kV,排针-辊间距h=60 mm的单个放电针上的电流分布
Fig.5
Current distribution on single discharge needle when the corona voltage is 33 kV, and h is 60 mm
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