Method for operation of dust collection device, and dust collection device

A dust collection device comprising a pre-charging unit and a bag filter in a flue gas duct through which a gas flows, with the pre-charging unit disposed upstream from the bag filter, wherein the pre-charging unit comprises:

• electrodes that charge a dust within the gas,
• a power source that supplies electric power to the electrode, and
• a gas flow rate control device that adjusts a flow rate of the gas flowing through the pre-charging unit to a prescribed value.

A method for operating a dust collection device comprising, in a flue gas duct through which a gas flows, a pre-charging unit that charges a dust within the gas, and a bag filter that collects the dust, with the pre-charging unit disposed upstream from the bag filter, the method comprising:

• a step of charging the dust by applying a voltage to the dust from electrodes provided inside the pre-charging unit, wherein
• the step of charging the dust comprises a stage of varying the voltage applied by employing on-off charging control.

A method for operating a dust collection device comprising, in a flue gas duct through which a gas flows, a pre-charging unit that charges a dust within the gas, and a bag filter that collects the dust, with the pre-charging unit disposed upstream from the bag filter, wherein

• a boxer charger is used for the pre-charging unit,
• the method comprises a step of charging the dust by applying a voltage to the dust from electrodes provided inside the pre-charging unit, and
• the step of charging the dust comprises a stage of stopping application of an extraction voltage, or temporarily increasing a superimposed excitation voltage.