Horizontal electrostatic precipitator
The electrostatic precipitator works by using a high-voltage electric field to ionize the flue gas, and the dust charge in the air stream is separated from the air stream under the action of the electric field. The negative electrode is made of metal wires with different cross-sectional shapes, called a discharge electrode.
The positive electrode is made of metal plates of different geometries, called a dust collecting electrode. The performance of an electrostatic precipitator is affected by three factors, including the nature of the dust, the structure of the equipment, and the velocity of the flue gas. The specific resistance of dust is an index for evaluating conductivity, and it has a direct impact on the efficiency of dust removal. The specific resistance is too low, and it is difficult for the dust particles to remain on the dust collecting electrode, causing it to return to the airflow. The specific resistance is too high, and the charge of the dust particles reaching the dust collecting electrode is not easy to be discharged. A voltage gradient between the dust layers will cause local breakdown and discharge. These conditions will cause the dust removal efficiency to decrease.
The electrostatic precipitator is composed of two parts: one is the main body of the electrostatic precipitator; the other is the power supply device that provides high-voltage direct current and the low-voltage automatic control system. The schematic diagram of the structure of the electric precipitator is shown in Figure 1. The high-voltage power supply system supplies power to the step-up transformer, and the dust collector of the precipitator is grounded. The low-voltage control system is used to control the temperature of the electromagnetic vibrating hammer, the ash discharge electrode, the ash conveying electrode and several components.
The basic principle of an electrostatic precipitator is to use electricity to capture dust in flue gas, which mainly includes the following four interrelated physical processes: (1) Ionization of gas. (2) Charge of dust. (3) The charged dust moves toward the electrode. (4) Capture of charged dust.
The trapping process of charged dust: on two metal anodes and cathodes with large differences in curvature radii, a high-voltage direct current is used to maintain an electric field sufficient to ionize the gas. The dust passing through the electric field causes the dust to gain an electric charge. Under the action of electric field force, dust with different polarities are moved to electrodes of different polarities and deposited on the electrodes, so as to achieve the purpose of separating dust and gas.
Compared with other dust removal equipment , electrostatic precipitator has less energy consumption and high dust removal efficiency. It is suitable for removing 0.01-50 μm dust in flue gas, and can be used in places with high flue gas temperature and high pressure. Practice has shown that the larger the amount of flue gas processed, the more economical the investment and operating costs of using an electrostatic precipitator.
Wide-pitch horizontal electrostatic precipitator technology
HHD wide-pitch horizontal electrostatic precipitator is the scientific research result of research and development in order to adapt to the increasingly strict requirements of exhaust gas emissions and WTO market standards by introducing and learning from advanced foreign technologies, combining the characteristics of industrial furnace exhaust gas conditions in various industries in China. The results have been widely used in metallurgy, power, cement and other industries.
Optimal wide pitch and special configuration of plates
It makes the electric field strength and plate current distribution more uniform, the driving speed can be increased by 1.3 times, and the specific resistance range of dust collection can be expanded to 10 1 -10 14 Ω-cm. It is especially suitable for sulfidized bed boilers and new cement dry rotary kiln. The high-resistance dust recovery of exhaust gas, such as sintering machines, slows down or eliminates the phenomenon of back corona.
Overall new RS corona wire
The maximum length can be up to 15 meters. It has low corona voltage, high corona current density, strong rigidity, and never breaks. It has high temperature resistance and heat resistance. Combined with top vibration method, it has excellent dust removal effect. The corona linear density is configured according to the dust concentration, so that it can adapt to dust collection with high dust concentration. The maximum allowable inlet concentration can reach 1000g / Nm 3
Strong corona at the top of the corona pole
The top discharge electrode, which is designed according to the dust cleaning theory, can be used for strong vibration, which can be mechanical or electromagnetic.
Free hanging of yin and yang poles
The dust collection system and corona electrode system of HHD electric dust collector both adopt a three-dimensional suspension structure. When the exhaust gas temperature is too high, the dust collector and corona electrode will arbitrarily expand and extend in three dimensions. The dust collector system is also specially designed. The heat-resistant steel belt restraint structure makes the HHD electric dust collector have a high resistance to heat change. According to commercial operation, the highest temperature resistance of the HHD electric dust collector can reach 390 ° C.
Increased rapping acceleration
Improve the dust removal effect: The quality of the dust collection pole system directly affects the dust collection efficiency. Most electric collectors show a decline in efficiency after a period of operation. The root cause is mainly the poor dust collection plate cleaning effect. As a result, the HHD electric dust collector uses the latest impact theory and practical results to change the traditional flat steel impact rod structure to an integral steel structure. The experiments show that the minimum acceleration of the dust collecting plate surface is increased from 220G to 356G.
Small footprint and light weight
Because the discharge electrode system uses the top vibration design, and breaks the conventional creative use of asymmetric suspension design for each electric field, and the use of the United States Environmental Equipment Corporation shell computer software to optimize the design, so that the same total dust collection area, electricity The overall length of the dust collector is reduced by 3-5 meters, and the weight is reduced by 15%.
High Assurance Insulation System
In order to prevent the high voltage insulation material of the electric precipitator from condensing and creeping, the shell adopts a thermal storage double-layer inflatable roof design, the electric heating adopts the latest PTC and PTS materials, and the bottom of the insulating sleeve adopts a hyperbolic back-blow cleaning design, which completely eliminates porcelain Condensation on the bushing is prone to failure and is extremely convenient to maintain, maintain and replace.
Match LC high system
High-voltage control can be controlled by DSC system, host computer operation, low-voltage control by PLC control, Chinese touch screen operation. The high voltage power supply uses a constant current, high impedance DC power supply, matching the body of the HHD electric dust collector. Can produce high dust removal efficiency, overcome the high specific resistance, the superior function of processing high concentrations.