Pulse Firing Pattern for Electrostatic Precipitator Transformer
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Solution Overview
Problem
Traditional pulse firing patterns in electrostatic precipitators limit the power supplied to collecting electrodes and discharge electrodes, often requiring operation without pulse firing when specific gas features demand higher power, and amplitude regulation affects corona discharge and dust collection.
Innovation Solution
A pulse firing pattern that allows for fine regulation of power supply to collecting electrodes and discharge electrodes without amplitude modulation, using a control unit to implement patterns that optimize power transfer, such as those shown in FIGS. 5a through 5e, ensuring no transformer saturation and improved dust collection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional pulse firing patterns with one first element and even number of second elements are used, then transformer saturation is prevented, but power supply to collecting electrodes and discharge electrodes is limited
Solution Approach 1:
The pulse firing pattern is segmented into multiple first elements (indicating pulses to be fired) and second elements (indicating pulses to be blocked). By using patterns with multiple first elements separated by odd numbers of second elements, the system divides the power supply into multiple active pulses within each pattern cycle, thereby increasing total power delivery while maintaining transformer protection through the blocking pulses.
Solution Approach 2:
The system dynamically adjusts the pulse firing pattern based on operational requirements. Different patterns with varying numbers of first and second elements can be selected to optimize power delivery while preventing transformer saturation. The control system can switch between different pulse patterns adaptively.
2Power
If amplitude regulation is used to control power supply, then power management is achieved, but corona discharge and dust collection are negatively affected
Solution Approach 1:
Instead of continuously regulating amplitude, the system uses periodic pulse firing patterns where power is delivered in discrete pulses separated by blocking intervals. This periodic on/off action allows power management without continuously affecting the corona discharge characteristics, as the pulses are brief and separated by recovery periods.
Solution Approach 2:
The system changes the temporal parameters of power delivery (pulse timing, duration, and frequency) rather than continuously adjusting amplitude. By modifying when pulses are fired and blocked rather than how strong they are, the system achieves power management while preserving the integrity of each individual pulse for effective corona discharge.
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
Enables the supply of any desired power to collecting electrodes and discharge electrodes while preventing transformer saturation, allowing for optimal operation across varying gas conditions without negatively impacting corona discharge or dust charging.
Implementation Method 1
the filter receives the electric power from the electric grid (e.g. this electric power can have sinusoidal voltage and current course) and skips some of the half waves of the electric power (e.g. voltage or current) according to a pulse firing pattern, generating a pulsed power that is supplied to the transformer
Implementation Method 2
If the transformer is supplied with a pulsed power having two or more successive pulses of the same polarity (i.e. positive or negative), this would cause a risk of saturation of the transformer
Implementation Method 3
the rectifier is in turn connected to collecting electrodes and discharge electrodes
Implementation Method 4
electrostatic precipitators are known to comprise a filter connected to a transformer in turn connected to a rectifier
Data Source
AI summary
The pulse firing pattern for a transformer of an electrostatic precipitator comprises first elements indicative of a pulse to be fired and second elements indicative of a pulse to not be fired. The pulse firing pattern further comprises couples of adjacent second elements and at least two first elements.