An electrostatic precipitator in one embodiment includes an outer housing defining an internal space, and a primary collector disposed therein which comprises a pair of nested inner and outer radial collecting walls. A collection annulus is formed between the walls which receives a flowing process gas stream. Electrodes within the annulus electrically charge particles entrained in the gas stream which electrostatically adhere to the collecting walls. In one embodiment, the collecting walls rotate through a stationary cleaning station in the housing which includes mechanical devices such as scrapers to automatically and mechanically remove the collected particles from the walls. The devices may be vertical drag chains with scrapers coupled thereto in one embodiment. The precipitator may be a wet electrostatic precipitator which treats an incoming wetted gas stream. The precipitator is especially adapted to remove sticky type particulate from the collecting walls.

A electrostatic precipitator includes a charger configured to charge foreign substances introduced thereinto, and a dust collecting sheet on which the charged foreign substances are collected, The dust collecting sheet includes a first electrode, a second electrode spaced apart from the first electrode to face the first electrode and on which the foreign substances passed through the charger are collected, a first power connector electrically connected to the first electrode so as to apply a voltage to the first electrode, a second power connector electrically connected to the second electrode so as to apply a voltage having a potential difference with the first electrode, to the second electrode, and a third power connector additionally electrically connected to the second electrode to apply additional voltage to allow the second electrode to generate heat.

An engine air intake dust removal system and method, comprising an air intake dust removal system inlet (1011), an air intake dust removal system outlet and an air intake electric field device (1014). The air intake dust removal system (101) and method can effectively remove particulate matters from air trying to enter the engine, and make the air entering the engine cleaner.

A method for reducing dust removal electric field couplings includes the following steps: selecting a ratio between a dust collection area of a dust removal electric field anode and a discharge area of a dust removal electric field cathode to be 1.667:1-1680:1. A dust removal electric field anode and/or dust removal electric field cathode size is selected so that the number of electric field couplings is less than or equal to 3. The number of electric field couplings is reduced, electric field energy consumption is low, electric field coupling consumption for an aerosol, water mist, oil mist and loose smooth particulate matter is reduced, and electric field energy is saved.

An air dust removal method, comprising the following steps: 1) using an ionization dust removal electric field to adsorb particulate matters in intake air; and 2) using the ionization dust removal electric field to charge an intake air electret element. The method can effectively remove dust in air, the dust removal ability is better, and the dust removal efficiency is higher.

An air dust removal system (101) includes a dust removal system inlet (1011), a dust removal system outlet, and an electric field apparatus (1014). The electric field apparatus (1014) has an electric field apparatus inlet, an electric field apparatus outlet, a dust removal electric field cathode (10142), and a dust removal electric field anode (10141); the dust removal electric field cathode (10142) and the dust removal electric field anode (10141) are used for generating an ionization dust removal electric field. When dust is collected in the ionization dust removal electric field, the electric field apparatus (1014) detects an electric field current. The air dust removal system (101) can effectively remove particulate matters in air.

A system for removing dust from the air includes a dust-removing system inlet, a dust-removing system outlet and an electric field apparatus. The electric field apparatus has an electric field apparatus inlet, an electric field apparatus outlet, a dust-removing electric field cathode and a dust-removing electric field anode. The dust-removing electric field cathode and the dust-removing electric field anode are used to generate an ionizing electric field for dust removal. The system for removing dust from the air can effectively remove particulates in the air.

An air dust removal system (101) includes a dust removal system inlet, a dust removal system outlet, and an electric field device (1014). The electric field device (1014) has an electric field device inlet (1011), an electric field device outlet, a dust removal electric field cathode (10142), and a dust removal electric field anode (10141). The dust removal electric field cathode (10142) and the dust removal electric field anode (10141) generates an ionizing dust removal electric field. The dust removal electric field anode (10141) has a first anode portion (101412) and a second anode portion (101411). The first anode portion (101412) is close to the inlet of the electric field device (1014), and the second anode portion (101411) is close to the outlet of the electric field device (1014). At least one insulating mechanism (1015) is provided between the first anode portion (101412) and the second anode portion (101411).

A system for removing dust from air (101) includes a dust removal system inlet (1011), a dust removal system outlet, and an electric field apparatus (1014). The electric field apparatus (1014) has an electric field apparatus inlet (3085), an electric field apparatus outlet (3088), a dust removal electric field cathode (3081) and a dust removal electric field anode (3082). The dust removal electric field cathode (3081) and the dust removal electric field anode (3082) are used to generate an ionization dust removal electric field. By means of the present system for removing dust from air (101), particulate matter can be effectively removed from air.

An electrostatic precipitator including an outer electrode of a tubular shape whose internal space is passed through by gas to be processed, and an inner electrode arranged in the internal space so as to be coaxial with the outer electrode, is provided. A ratio Ra/Rb being a ratio of an outer radius Ra of the inner electrode to an inner radius Rb of the outer electrode is smaller than 1/e (where e is a base of a natural logarithm). The ratio Ra/Rb may be smaller than ½e. The outer radius Ra of the inner electrode may be from 1 mm to 10 mm, and the inner radius Rb of the outer electrode may be from 10 mm to 100 mm.