Electrostatic Precipitator Charge Control for Back Corona Suppression
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The intermittent charging method for electrostatic precipitators is ineffective in preventing back corona and maintaining dust collection performance, especially during the charging pause period when the potential difference between electrodes is reduced, leading to decreased dust collection efficiency.
Innovation Solution
The method involves dividing the charging pause time into two periods: a first period where the current output is stopped, and a second period where a current less than that of the charging time but greater than the first period is applied to maintain a voltage that prevents back corona, thereby reducing the risk of dielectric breakdown and maintaining dust collection efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a long charging pause time period is adopted to suppress back corona, then the occurrence of back corona is reduced, but the voltage for charging decreases and dust collection performance deteriorates
Solution Approach 1:
The patent applies dynamics by making the current output dynamic during the charging pause period instead of keeping it static. The control program adjusts the current output in two stages: first reducing it to suppress back corona, then increasing it to maintain dust collection performance. This dynamic adjustment resolves the contradiction between suppressing back corona and maintaining productivity.
Solution Approach 2:
The patent uses periodic action by implementing a two-stage current output pattern during the charging pause period. The current is first reduced to a low level to suppress back corona, then increased to a higher level to maintain dust collection performance. This periodic variation in current output allows the system to alternately address back corona suppression and performance maintenance within the same pause period.
2Reliability
If current output is stopped during charging pause period, then back corona is suppressed, but electrical field strength decreases and dust collection efficiency drops
Solution Approach 1:
The patent applies dynamics by making the current output dynamic during the charging pause period instead of keeping it static. The control program adjusts the current output in two stages: first reducing it to suppress back corona, then increasing it to maintain dust collection performance. This dynamic adjustment resolves the contradiction between suppressing back corona and maintaining productivity.
Solution Approach 2:
The patent applies parameter changes by modifying the current output parameter during the charging pause period. The control program changes the current parameter from a high level to a low level to suppress back corona, then increases it to a moderate level to maintain electrical field strength and dust collection efficiency. This parameter adjustment resolves the contradiction between back corona suppression and power maintenance.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach effectively suppresses back corona and maintains dust collection performance by adjusting the current output during the charging pause period, ensuring a stable electrical field that prevents dielectric breakdown and maintains efficient dust removal.
Implementation Method 1
a power supply that applies a potential difference between the first electrode and the second electrode so as to repeat a charging time period and a charging pause time period
Implementation Method 2
an electrostatic precipitator that collects dust contained in exhaust gas by means of an electrostatic force
Implementation Method 3
imparts a positive or negative charge to dust contained in gas by means of corona discharge, and thereby charges the dust
Implementation Method 4
a back-corona phenomenon whereby dielectric breakdown occurs in a dust layer is liable to occur
Data Source
AI summary
In a charging time period T1, a dry electrostatic precipitator outputs DCON that is a current for charging a collection target object from a high voltage power supply. Subsequently, in a second period of time T2-2 after a first period of time T2-1 passes from a time that a charging pause time period T2 starts, the dry electrostatic precipitator outputs DCBC that is a current that is less than DCON and is greater than a current in the first period of time T2-1, from the high voltage power supply.