In the north, central heating is the main form of heating at present. Central heating is to transport the hot water supplied by the boiler room to the radiators in the relevant rooms through pipes. After the heat is dissipated, it flows back to the boiler for recycling. The heat in the boiler room The water is mainly heated by burning coal, and the flue gas SO2, NO2, etc. will be generated. If it is not treated, it will be discharged into the atmosphere and pollute the environment. This does not conform to the current national energy conservation and environmental protection policy. So the current general method is to use centrifugation. The fan desulfurizes the exhaust gas produced by burning coal and sends it into the dust bag. This article introduces the application of the easy-to-drive CV3100 series 400KW inverter in the urban heating system of Dunhuang, Gansu.
2. Introduction to the energy-saving principle of the inverter
Frequency conversion speed regulation applies energy-saving principles to fans
Theoretically, the fan air volume (Q), wind pressure (H) and motor speed (N), motor power (P) have the following relationship:
Q1/Q2=N1/N2; H1/H2=(N1/N2)2, P1/P2=(N1/N2)3
When the air volume decreases, the motor speed drops, the motor input power decreases rapidly. If the air volume drops to 80%, the motor speed also drops to 80%, and the motor shaft power drops to 51% of the rated power; if the air volume drops to 50%, the motor shaft power is about 14% of the actual power. Therefore, the power saving potential is great. This principle also applies to circulating water pumps for water supply. Therefore, for fans with a wide range of air volume and flow adjustment, using speed control to replace the air door and valve adjustment is an effective way to achieve energy saving.
3. Features of Yidrive CV3100 series inverter
The CV3100 series inverter is a speed sensorless current vector inverter independently developed by our company with a new concept. Under the premise of improving stability, it has added motor parameter self-identification, analog current output, switch output, flexible frequency setting methods, and can realize online switching of multiple frequency setting methods, online parameter modification, and pulse frequency setting. A series of practical and advanced functions such as fixed and power-off parameter storage, fixed swing amplitude, variable swing frequency control, RS485 communication, etc. It provides equipment manufacturers and end customers with a highly integrated integrated solution, which is of great help to reducing system procurement and operating costs and improving system reliability.
Four, scene pictures
The use of frequency conversion technology reduces mechanical impact and impact on the power grid, and reduces maintenance. At the same time, the easy-drive CV3100 series inverter has the protection functions of overvoltage, overcurrent, overload, undervoltage, overheating, etc., to ensure the reliability of the equipment Safe and continuous operation. In short, frequency converter speed regulation has been used more and more in boiler heating and centrifugal fan speed regulation with its high efficiency, low energy consumption and good stability, and it is worthy of promotion in all walks of life in society.