Application of the hottest high voltage inverter i

The application of high-voltage frequency converter in blower

through the frequency conversion transformation of high-voltage blower in thermal power plant, the energy consumption of equipment is reduced, and the production efficiency is improved. The results are reproduced: the experimental results can be accessed arbitrarily, and considerable social and economic benefits have been achieved. The original operation mode of the blower is reduced pressure startup and power frequency operation, and its air volume is also adjusted by adjusting the air valve. The disadvantages of this control method are large waste of electric energy, large waste of fuel, poor real-time regulation, high noise, and high labor intensity of workers. With the large-scale adjustment of power generation load, the blower air volume is often in a low efficiency state due to the change of boiler load, and a large amount of energy is wasted on the air duct baffle. In recent years, with the rapid development of high-voltage frequency conversion technology, the frequency conversion transformation of boiler drum and induced draft fan has been widely used. Through market research, we have introduced the PowerSmart TM series high-voltage inverter of Jiuzhou electric, which adopts advanced power electronic devices IGBT, multi-level topology circuit and PWM modulation strategy. Controlled by high-speed digital signal processor DSP, it can transform the power of 3000~10000 V three-phase AC power supply system with fixed frequency and amplitude, and produce a high-voltage AC system with adjustable frequency and current depending on the load, Thus, the three-phase motor can realize continuous speed regulation

estimation of energy saving: before the transformation, the current of the blower was about 30a, and the opening of the fan baffle was between 60~70%. After the transformation, the current of the blower was reduced to 20a, a decrease of 1/3, and the opening of the baffle was 100%. The operating condition is based on 24-hour continuous operation, and the annual operating time is 300 days, so the annual power saving during variable frequency speed regulation is p=1.732 × six × ten × zero point nine five × twenty-four × 300=710812kW h。 According to the calculation of 0.48 yuan per kilowatt hour, the annual electricity cost can be saved by about 341190 yuan

other effects produced by the application of high voltage variable frequency speed regulation system: the process is improved. After the frequency converter is put into operation, the dust removal fan can adjust the air volume very smoothly and stably, and the operators can adjust and control freely. The operating parameters of the dust removal fan have been improved, and the lunch box products should meet the gb4806.7 standard, which improves the efficiency

prolong the service life of motor and fan. Generally, dust removal fans are centrifugal fans with long starting time and large starting current (about 6 ~ 8 times the rated current), which has a great mechanical impact on the motor and fan and seriously affects its service life. After adopting frequency conversion speed regulation, soft starting and soft braking can be realized, which has little impact on the motor and can greatly prolong the service life of the machine

reduce the wear of valve machinery and fan impeller. After the installation of variable frequency speed regulation, the fan often operates at a speed 150 RPM lower than the original constant speed. Therefore, the wear of the fan impeller is greatly reduced and the fan vibration is reduced. Extend the overhaul cycle of the fan and save maintenance costs and time

it is convenient to realize the automation of dust removal control system. The air volume of the dust removal system often needs to change according to the requirements of the process. In the past, when the baffle was used to adjust, there was the opening of the actuator. It was widely used in foreign markets and tended to be a linear problem of the relationship curve between saturation and flow. Often, due to the excessive wear of the actuator, the valve characteristics change and non-linear problems occur, resulting in the error of the adjustment process and the failure of the automatic control system to work normally. The variable-frequency speed regulation always keeps the high-precision working within the range of 0.1 ~ 0.01Hz, creating superior conditions for realizing the automation of the dust removal system

through the technical transformation of blower, our factory has improved the production efficiency, and the economic and social benefits are considerable. In the future, we will further strengthen the technical transformation of starch based plastics as the most common degradable material in our life, and build our factory into a modern power plant with high technology and high efficiency