Horizontal electrostatic precipitator and electrostatic precipitation method using the same

A horizontal electrostatic precipitator comprising:

• a housing having an inlet duct, into which a gas is introduced, and an outlet duct from which the gas is discharged;
• an internal partition wall extending in a flow direction of the gas in the housing and configured to respectively divide spaces within the housing;
• a plurality of passage switching members in the respectively divided spaces to control the flow of the gas;
• a collection module in the housing and comprising a plurality of discharge electrodes, to which a voltage is applied, and a plurality of collection electrodes between the respective discharge electrodes, the collection electrodes being grounded, and the collection module being configured to collect dust;
• a washing water feeder configured to spray washing water to the collection module;
• and
• a controller configured to control the washing water feeder to supply the washing water only to one of the divided spaces, which is closed so that inflow and outflow of air are blocked by controlling the passage switching members.

An electrostatic precipitation method using an electrostatic precipitator comprising a collection module having a collection electrode and a discharge electrode, a housing having an internal partition wall formed therein to define a plurality of flow spaces, an inlet-side passage switching member, and an outlet-side passage switching member, the electrostatic precipitation method comprising:

• collecting foreign substances by applying a voltage to the discharge electrode while a gas flows in the electrostatic precipitator;
• closing some of the flow spaces using the passage switching members;
• and
• performing foreign substance collection on an open one of the flow spaces by applying a voltage to the discharge electrode therein, and performing washing on a closed one of the flow spaces by supplying washing water to the collection electrode therein.