To ensure stable operation of electrostatic pr翻译文献.doc
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1、To ensure stable operation of electrostatic precipitator efficiency measuresESP 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 e
2、fficiency 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 factor1.1 High-low-voltage power supply control device design and operation of th
3、e poorReasonable 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 change.
4、 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 rectifi
5、er 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 coro
6、na 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 the
7、principles of the blind spot, resulting in power supply poor operation of control devices.1.2 vibration cleaning device operating mode unreasonableAt present, thermal power plants in addition to the use of electricity, and all is vibration cleaning methods. In the vibration intensity and uniformity
8、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. Vibr
9、ation 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 electrostatic p
10、recipitator 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, result
11、ing 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 flue ga
12、s 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 gray ash b
13、ucket 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 normalUnder the normal load in the boiler flue gas flow, exhaust gas temperature, flue gas dust concentration and other parameters wit
14、h 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 deteriorate, so
15、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 anode plat
16、e 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 increased,
17、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 coalIf coal burning boiler changes in the design of its calorific value than coal with low ash coal than the design of high, it will incre
18、ase 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 design of fl
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