| Thermal power plant boiler at present two fan, a fan and a fan with high pressure motor are mostly used for high voltage vacuum circuit breaker voltage frequency operation, as a result of air volume and pressure to retain a certain design margin (25%to35%), with the boiler load change fan air volume, only through adjusting damper closure of adjusting air quantity to meet the requirements of the production process, damper opening degree is generally45to68%with load fluctuations, a large amount of electric energy wasted in the baffles interception loss, in order to improve the operation efficiency of fan, reduce the fan baffle interception loss, it is necessary to analyze the research of boiler blower motor energy saving technology transformation.Now due to the thermal power plant the large capacity motor, usually for high voltage motor, by installing high voltage inverter for speed control, allowing the blower damper open, by adjusting the fan motor speed regulating fan air volume, can be substantially reduced in the fan baffle interception loss, thus improving the operation efficiency of fan, and pressure inverter for stepless speed regulation, can realize the air flowrate control linear regulator, which can greatly improve the boiler load adjustment precision, and can realize the fan motor soft start and brake, greatly reducing the high voltage motor and fan in the starting impulse, high voltage motor and to extend the service life of the fan at the same time, reducing equipment maintenance repair costs.Based on the current75T fluidized bed boiler wind machine two (10KV,220KW) high voltage frequency conversion energy-saving technological transformation of the feasibility, safety, economy, on the basis of analysis and calculation, confirm the transformation of practicability, energy saving and reliability, based on the original system air volume, air pressure, power and other parameters, analysis and calculation of energy saving rate can reach above20%, the annual energy saving more than300000KWh, the two fan high pressure frequency conversion technical transformation of protection configuration analysis, design of high voltage converter system in the frequency and frequency of two operation status of various reliable protection configuration, increase technical reformation after the system reliability of the protection, the two fan high pressure frequency conversion energy-saving technological transformation of system wiring scheme, construction scheme, starting control and automatic switching bypass means undertook thorough analysis research, and technological transformation of the data parameters were compared before and after, when the boiler load when68T/h is running, the saving rate is25%, when the boiler load the53T/h runtime, energy-saving rate is as high as70%, can be seen through the high voltage frequency conversion technical transformation, greatly improving the two fan light load operation efficiency, energy saving transformation project The effect is very obvious, within two years to recover the investment cost, but also through technical transformation after frequency conversion, which can greatly improve the two fan control precision and reliability of fault protection, through the DCS with high voltage frequency conversion technical transformation system connection control, remote start, frequency and automatic switching, start, speed closed loop operation, improves the system control of the degree of automation, convenient operation and the operation control, which ensure the operation of the economy and ensure the safety of system, the automatic, the convenience of the operation. |
PDF Full Text Request