1、To ensure stable operation of electrostatic precipitator efficiency measures ESP is a highly efficient dust collector, has been more and more used by coal-fired power plants. Electrostatic precipitator in order to maintain long-term, high-performance and stable operation, it should be affecting the
2、efficiency of electrostatic precipitator factors analysis, and to the strengthening of electrostatic precipitator operation, maintenance and overhaul management. 1 Affect the efficiency of electrostatic precipitator dust factor 1.1 High-low-voltage power supply control device design and operation of
3、 the poor Reasonable corona ESP power is to ensure safe, stable operation of one of the important factors. ESP 380V DC high voltage from high-voltage alternating current flowing through thyristor rectifier equipment supply, electric dust collector of high-voltage power supply impedance is a load cha
4、nge. Impedance when the electric field increased ER-hour requirements of equipment to automatically step-up； lower impedance when the electric field and current become larger, the requirements of equipment to automatically step-down in order to maintain the current settings. Internal transformer rec
5、tifier voltage and current sampling resistor, the introduction of negative feedback signals, processed by the microcomputer intelligent control thyristor phase-shift of the conduction angle, the output voltage to change the load to the purpose of output, so that the most effective electric field of
6、corona power. However, some power and control equipment, factory production control of the controller of the device characteristics and control methods are not perfect protection, etc., coupled with the power plant operation and maintenance personnel of equipment There is a certain understanding of
7、the principles of the blind spot, resulting in power supply poor operation of control devices. 1.2 vibration cleaning device operating mode unreasonable At present, thermal power plants in addition to the use of electricity, and all is vibration cleaning methods. In the vibration intensity and unifo
8、rmity requirements are met, the vibration system (cycle time, the way) is reasonable for the efficiency of electrostatic precipitator dust impact. Vibration cycle, the impact on the collection efficiency is to be able to make when cleaning off the dust from falling into the ash bucket directly block
9、. Vibration cycle is too long, fouling plate thickness, will reduce the dust in the very board charged the conductive properties, reducing collection efficiency； vibration cycle is too short, dust will be dispersed into falling, have given rise to the second dust , that is deposited on the electrost
10、atic precipitator dust collecting on the pole again with a dust collector currents, in particular the electric field at the end of the second polar dust would greatly reduce the efficiency of electrostatic precipitator. Dust caused by the second there are many factors, such as high resistivity dust,
11、 resulting in anti-corona electric field collecting the uneven distribution of the flue gas flow rate or flow rate caused by high turbulence and swirl. Therefore, the requirements of the electric field of flue gas flow rate of not more than 3m / s, the general operation of the electric field in the
12、flue gas flow rate 1.5m / s or so, and the possible distribution of flue gas flow, and the vibration frequency of cleaning off is caused by dust Secondary dust factor. Follow certain procedures, using appropriate test methods, establish the right vibration system, at the same time strengthen the gra
13、y ash bucket equipment maintenance to prevent gray ash blocked out the Big Dipper, can prevent the occurrence of secondary dust. 1.3 boiler operating parameters deviate from normal Under the normal load in the boiler flue gas flow, exhaust gas temperature, flue gas dust concentration and other param
14、eters with the design parameters of electrostatic precipitator or less the same as all the normal operation of electrostatic precipitator. If the boiler flue gas flow increases, smoke temperature, flue gas dust concentration increased, the electrostatic precipitator operating conditions will deterio
15、rate, so that lower collection efficiency. When the boiler low-load running time, in order to stabilize combustion, must be input for combustion of heavy oil or diesel, resulting in flue gas temperature and increase in the viscous material. These viscous materials hypertrophy caused by cathode-ray a
16、node plate deposition, resulting in decreased efficiency of the electric field of the dust. If vapor leaks in the boiler, flue gas will increase the humidity, although in a very short time because of smoke and quenched and tempered by lower resistance than the ash, dust removal efficiency will be in
17、creased, but a little longer, will seriously fouling ESP, In particular, when the disclosure of large, plate or scale, will reduce the life of precipitator. 1.4 changes in coal If coal burning boiler changes in the design of its calorific value than coal with low ash coal than the design of high, it
18、 will increase its coal, flour mills, dust, ash equipment wear and shorten the maintenance cycle of the equipment. The use of low calorific value coal, the actual coal-fired boilers will increase so that the volume of flue gas containing ash increased. This will make ESP more than dealing with the d
19、esign of flue gas dust concentration values, collection efficiency will be seriously affected. In order to eliminate coal from the impact of changes in collection efficiency of electrostatic precipitator, dust removal equipment in the system under normal circumstances, each electrostatic precipitato
20、r should be carried out at least one of the characteristics of typical coal tests to determine the coal, electricity , vibration efficiency electrostatic precipitator for the combined effect of the ESP to find the best operating mode. 2 strengthen the electrostatic precipitator maintenance and repai
21、r work (1) State Power Environmental Protection produced by DJ series of computer-controlled high-low-voltage power supply devices, and its use of advanced high-pressure control part of the 8098 single-chip and peripheral chips, control, protection functions, simple structure, easy-to-use features,
22、and for thermal power plant boiler combustion emission of dust (fly ash) than the changes in resistance provides a wide range of power supply to run a variety of different ways to meet the requirements of working conditions. This power supply equipment for the original transformation, the central pl
23、ane can be achieved with long-range and turbidity dust detector constitute the feedback signal of the closed-loop control electrostatic precipitator, to the effect of energy-efficient operation. Their protection and alarm functions involved in the importation of over-current, output open-circuit, ou
24、tput short circuit, undervoltage protection, partial excitation, SCR risk of open and critical temperature, the thermal power plant is almost covered by the operation of electrostatic precipitator for all fault types. (2) efforts to improve the status of the operation of electrostatic precipitator,
25、strictly enforce the electrostatic precipitator operation and maintenance guidelines， the existence of the operation of the equipment failures and shortcomings should be in time, establish a comprehensive, reasonable maintenance and project cycle. (3) maintenance area. Overhaul at the electrostatic precipitator in overcast, anode spacing adjustments, and record the measurement results before and after adjustment. To overcast, anode device vibration equipment (mainly electrical
