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          Dalian Bihai Environmental Protection Equipment Co., Ltd. is specialized in research, development, design, manufacture, installation, commissioning, after-sales service and technical consultation for environmental protection and gas/fume scrubbing.


          High pressure electrostatic precipitator

          1.   System Introduction

           The electrostatic precipitator is a dust collecting device with electric power action to clear away the solid and liquid particles in the gas. The discharge electrode (i.e. corona electrode) and dust collection electrode of the electrostatic precipitator are connected to high voltage DC power. When dusty gas goes through non-uniform electric field between the two electrodes, the gas is ionized and the dust particles get charged under the action of strong electric field around the discharge electrode. The charged dust particles move to the dust collection electrode under the action of electric field force so that dust collection can be completed.

          With the advantages of large gas volume treatment, high-temperature resistance, small resistance and low energy consumption, the electrostatic precipitator is widely used as efficient and important dust collection equipment both in home and abroad in various industrial sectors especially for power sector, metallurgy sector, building materials sector, chemical sector, mechanical sector, etc. 


          2.   Composition of electrostatic precipitator

          The electrostatic precipitator mainly consists of body, high voltage rectifying device and low voltage controlling device. The introduction here is mainly about the most widely used plate horizontal electrostatic precipitator (the dust collection electrode is in plate form). Its composition is shell, air deflector, air distribution plate, and anode system, anode vibration system, cathode system, cathode vibration system and dust conveying system.


          (Sketch of Anode Plate)

          (Sketch of Cathode Wires)


          3.   Characteristics of the electrostatic precipitator

           (1) High dust collection efficiency. The collection efficiency of the electrostatic precipitator can be enhanced by lengthening the electric field. Over 99% of collection efficiency can be reached if the dust in the gas is under normal condition.

          (2) Small resistance and low energy consumption. The energy consumption of the electrostatic precipitator mainly includes equipment resistance loss, power supplying device, heating and heat preservation, vibration motor etc.. The resistance of the electrostatic precipitator is normally between 200 to 300Pa, approximately one fifth of that of bag filter. The operation cost is less than that of the bag filter because of low energy consumption and seldom changing the vulnerable parts.

          (3) Wide application scope. The electrostatic precipitator can collect particles with the diameter of less than 0.1um in high temperature gas around 300 400 . When the gas indexes fluctuate within the prescribed scope, the electrostatic precipitator still has a good collection performance. The dust specific resistance in gas has a great importance on the operation of the electrostatic precipitator. If the specific resistance is less than 104Ω·cm or more than 1011Ω·cm, the normal operation of electrostatic precipitator will be disturbed.

          (4) Large gas treatment volume. Because the parts are fabricated in standard shape, the larger-scale device can be assembled. For the moment the gas treatment volume for one single electrostatic precipitator can reach 200 ×104m3/h and even more. It is uneconomic to adopt other dust collectors for treatment of large volume gas.

          (Sketch of Anode Plate)


          4.   Working Principle

           The electrostatic precipitator adopts high voltage static to separate the dust from gas. There is linear discharge electrode (cathode) and platy dust collection electrode (anode) in the electric field. When energize the DC high voltage between the two electrodes, the nonuniform electric field is formed because of different forms of the two electrodes. When the imposed DC voltage reaches a certain volume, the electric field intensity around local areas of discharge electrode is strong enough to ionize the gas and generate electrons, positive ions and negative ions. Of which the positive ions will soon arrive at the discharge electrode to be neutralized, while a large amount of electrons and negative ions move to the dust collection electrode under the action of electric field force, which is called corona discharge and corona current. When dusty gas passes through the passages among the electrodes, the electrons and negative ions in corona current will absorb the dust and let the dust get charged. (Since the positive ion has a small action area, electron and negative ion will absorb most of the dust) The charged dust moves toward the dust collection electrode under the action of electric field force and finally deposits on the dust collection electrode plate and releases the electric charge. When the deposited dust reaches a certain thickness, it can be exhausted into the dust hopper via vibration device so that the whole separation is done.

          5.   Type


          6. Technical Parameters

          (1) Dust collection efficiency: 99%-99.8%

          (2) Allowable highest gas temperature: 350 , long-term working temperature: 250

          (3) Output voltage of the high voltage rectifying transformer: 60-80KV

          (4) Vibration method: electromagnetic vibration or mechanical vibration

          (5) Commonly used electrode plate: 480 C or Z type

          (6) Corona electrode: RS barbed wire, astroid, fishbone wire, spiral line