Electrostatic precipitatorquiet

Electrostatic precipitatorThe working principle of is to use a high-voltage electric field to ionize the flue gas, and the dust in the airflow is charged and separated from the airflow under the action of the electric field. The negative electrode is made of metal wires with different cross-sectional shapes and is called a discharge electrode. The positive electrode is made of metal plates with different geometric shapes, called a dust collecting electrode. static electricitydust collectorThe performance is affected by three factors: dust properties, equipment structure, and flue gas flow rate. The specific resistance of dust is an indicator for evaluating conductivity, which has a direct impact on dust removal efficiency.

The specific resistance is too low, making it difficult for dust particles to remain on the dust collection electrode, resulting in their return to the airflow. If the specific resistance is too high, the dust particles that reach the dust collection electrode are not easily discharged, and a voltage gradient is formed between the dust layers, which can cause local breakdown and discharge phenomena.

These situations will cause a decrease in dust removal efficiency. Working principle/Electrostatic precipitator uses a strong electric field to charge dust particles. When they pass through the dust removal electrode, the positively/negatively charged particles are respectively adsorbed by the negative/positive electrode plates, achieving the purpose of dust removal Due to radiation friction and other reasons, the air contains a small amount of free ions, which alone cannot fully charge the dust particles in dusty air. Therefore, to use static electricity to separate dust, two basic conditions must be met: first, the existence of an electric field that charges the dust; The second is the existence of an electric field that separates charged dust particles. A typical electrostatic precipitator uses a combination of charged and separated electric fields. The metal rod of the discharge electrode is connected to the negative pole of the high-voltage DC power supply, and the dust collection electrode is grounded to the positive pole. The dust collection electrode can be a circular tube or a flat plate.

After connecting the power supply, free ions in the air will move towards the two poles under the action of an electric field. The higher the voltage and the stronger the electric field, the faster the movement speed of ions. Wet typeManufacturer of electrostatic precipitatorDue to the movement of ions, an electric current is formed between the electrodes. At the beginning, there are fewer free ions in the air and less current.

The voltage rises toAfter the numerical value is reached, the ions near the discharge electrode gain higher energy and velocity. When they collide with neutral atoms in the air, the neutral atoms will decompose into positive and negative ions, which is called air ionization. After air ionization, due to the interlocking reaction, the number of ions moving between the poles greatly increases, manifested as a sharp increase in the current between the poles, and air becomes a conductor. After all the air around the discharge electrode is ionized, a light blue halo can be seen around the discharge electrode, which is called corona. The corona range of electrostatic precipitators is usually limited to a few millimeters around the metal rod.

After the air ionizes within the corona range, positive ions quickly move towards the negative electrode, while only negative ions enter the corona outer region and move towards the anode. When dusty air passes through an electrostatic precipitator, due to the small range of the corona zone, only a small amount of dust particles pass through the corona zone, obtain positive charges, and deposit on the corona electrode.

Most dust particles pass through the corona discharge zone and obtain negative charges,Deposition on the anode plate, when dust accumulatesDue to gravity, it falls and gathers in the collection tank. Electrostatic precipitator and othersDust removal equipmentCompared to other methods, it consumes less energy and has higher dust removal efficiency. It is suitable for removing dust of 0.01-50 µ m from flue gas and can be used in situations with high flue gas temperature and pressure. Practice has shown that the larger the amount of flue gas processed, the more economical the investment and operating costs of using electrostatic precipitators.