Method of controlling the supply of conditioning agent to an electrostatic precipitator

A method for use in an electrostatic precipitator unit comprising discharge electrodes and collecting electrodes between which a varying high voltage is maintained by means of a pulsating direct current supplied thereto, said method controlling, for cleaning an incoming dust-laden gas, the supply of conditioning agent to said incoming dust-laden gas upstream of the precipitator unit, comprising of the steps of

• varying the frequency, the pulse charge and/or the pulse length of said pulsating direct current, so as to obtain a plurality of frequency-charge-length combinations;
• measuring or calculating a figure of merit for each combination, or for a defined group of combinations;
• using the figures of merit for establishing an optimal combination;
• and
• adjusting the supply of conditioning agent in dependence on the pulse frequency of the established optimal combination,
• wherein the figure of merit is determined by maintaining the frequency of the pulsating direct current constant while varying the pulse charge and/or the pulse length so as to obtain a plurality of charge-length combinations, and using the maximum value of the bottom value, the mean value and/or the peak value of the voltage as a figure of merit for the frequency concerned.

A method for use in an electrostatic precipitator unit comprising discharge electrodes and collecting electrodes between which a varying high voltage is maintained by means of a pulsating direct current supplied thereto, said method controlling, for cleaning an incoming dust-laden gas, the supply of conditioning agent to said incoming dust-laden gas upstream of the precipitator unit, comprising of the steps of

• varying the frequency, the pulse charge and/or the pulse length of said pulsating direct current, so as to obtain a plurality of frequency-charge-length combinations;
• measuring or calculating a figure of merit for each combination, or for a defined group of combinations;
• using the figures of merit for establishing an optimal combination;
• and
• adjusting the supply of conditioning agent in dependence on the pulse frequency of the established optimal combination,
• wherein the figure of merit is determined as the quotient between the peak value of the voltage between the electrodes of the precipitator, and the pulse charge, and wherein a comparison with other frequencies is performed either at a constant pulse charge or at a constant peak voltage.

A method for use in an electrostatic precipitator unit comprising discharge electrodes and collecting electrodes between which a varying high voltage is maintained by means of a pulsating direct current supplied thereto, said method controlling, for cleaning an incoming dust-laden gas, the supply of conditioning agent to said incoming dust-laden gas upstream of the precipitator unit, comprising of the steps of

• varying the frequency, the pulse charge and/or the pulse length of said pulsating direct current, so as to obtain a plurality of frequency-charge-length combinations;
• measuring or calculating a figure of merit for each combination, or for a defined group of combinations;
• using the figures of merit for establishing an optimal combination:
• and
• adjusting the supply of conditioning agent in dependence on the pulse frequency of the established optimal combination,
• wherein the figure of merit is determined by maintaining the frequency of the pulsating direct current constant while varying the pulse charge and/or the pulse length so as to obtain a plurality of charge-length combinations, and using the pulse charge at a given level for the peak value of the voltage between the electrodes of the precipitator, which level should fall significantly below the maximum value of the voltage at the frequency concerned, as figure of merit for said frequency.