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US 2001/0011499 A1Published application
Method of operating an electrostatic precipitator
AssigneeF.L. Smidth Airtech A/S
InventorVictor Reyes
Life of this patent
Estimating the term…
Abstract
A method of operating an electrostatic precipitator (7) comprises feeding the precipitator with electric power generated by a power supply (10) according to a regime adapted to impart between the precipitator electrodes a voltage having a DC components and an AC component. A control unit (8) measures the electrode voltage, establishes a voltage peak value and a voltage mean value, and computes the product of peak value by mean value to arrive at an index of expected performance (IEP) . Operating set points are tuned so as to maximize this index of expected performance.
Claims26
A method of operating an electrostatic precipitator, comprising the steps of
- intermittently feeding the precipitator with electric power according to a cycle comprising a controlled preset ON-time interval and a preset OFF-time interval in order to apply to the precipitator electrodes a cyclic time-varying voltage,
- monitoring the electrode voltage and establishing a voltage peak value and a voltage mean value,
- multiplying the established peak value with the established mean value to compute an index of expected performance (IEP),
- effecting successive incremental time variations of said ON-time interval and repeating the steps of monitoring and multiplying so as to establish a correlation of said index to said time variations,
- establishing a time value of said ON-time interval corresponding to a maximum of said index, and
- selecting said established time value as a new set point for said ON-time interval.
3 more elements
A method of operating an electrostatic precipitator, comprising the steps of
- intermittently feeding the precipitator with electric power according to a cycle comprising a controlled preset ON-time interval and a preset OFF-time interval in order to apply to the precipitator electrodes a cyclic time-varying voltage,
- monitoring the electrode voltage and establishing a voltage peak value and a voltage mean value,
- multiplying the established peak value with the established mean value to compute an index of expected performance (IEP),
- effecting successive incremental time variations of said OFF-time interval and repeating the steps of monitoring and multiplying so as to establish a correlation of said index to said time variations,
- establishing a time value of said OFF-time interval corresponding to a maximum of said index, and
- selecting said established time value as a new set point for said OFF-time interval.
3 more elements
A method of operating an electrostatic precipitator, comprising the steps of
- intermittently feeding the precipitator with electric power according to a cycle comprising a controlled preset ON-time interval and a preset OFF-time interval in order to apply to the precipitator electrodes a cyclic time-varying voltage,
- monitoring the electrode voltage and establishing a voltage peak value and a voltage mean value,
- multiplying the established peak value with the established mean value to compute an index of expected performance (IEP),
- effecting successive incremental time variations of said ON-time interval simultaneously with effecting successive incremental time variations of said OFF-time intervals and repeating the steps of monitoring and multiplying so as to establish a correlation of said index to said time variations,
- establishing a time value of said ON-time interval and a time value of said OFF-time interval corresponding to a maximum of said index, and
- Selecting said respective established time values as new set points for said ON-time interval and said OFF-time interval.
3 more elements
A method of operating an electrostatic precipitator, comprising the steps of
- intermittently feeding the precipitator with electric power according to a cycle comprising during a controlled preset ON-time interval a burst of current pulses, pulsating at a frequency of at least 20 kHz and providing to the precipitator a power input sufficient to raise the precipitator voltage at a rate of at least 30 kV/ms, and during a preset OFF-time interval a pause in the feeding in order to apply to the precipitator electrodes a cyclic time-varying voltage,
- monitoring the electrode voltage and establishing a voltage peak value and a voltage mean value,
- multiplying the established peak value with the established mean value to compute an index of expected performance (IEP),
- effecting successive incremental time variations of said ON-time interval simultaneously with effecting successive incremental time variations of said OFF-time intervals and repeating the steps of monitoring and multiplying so as to establish a correlation of said index to said time variations,
- establishing a time value of said ON-time interval and a time value of said OFF-time interval corresponding to a maximum of said index, and
- selecting said respective established time values as new set points for said ON-time interval and said OFF-time interval.
3 more elements
Dependencies are inferred from the claim text.