The principle of frequency conversion energy saving for fan and water pump:
The electricity consumption of electric motors in China accounts for 60% to 70% of the national power generation. The annual electricity consumption of wind turbines and water pump equipment accounts for 1/3 of the national electricity consumption. The main reason for this situation is: the traditional speed control method for fans, pumps and other equipment is to adjust the air supply and water supply by adjusting the inlet or outlet baffle and valve opening. The output power is a large amount of energy consumption in the baffle. , the valve is in the process of interception. Since most of the fans and pumps are square torque loads, the shaft power has a relationship with the speed. Therefore, when the speed of the fan and the pump decreases, the power consumed is also greatly reduced. Therefore, the energy saving potential is very large. The most effective energy saving measure is to use the frequency conversion. The governor adjusts the flow rate and air volume, and the power consumption rate of the inverter is 20% to 50%, and usually in the design, the capacity of the user pump motor design is much higher than the actual needs, and there is a phenomenon of “large horse-drawn carâ€. Inefficient, resulting in a large waste of electrical energy. Therefore, the promotion of AC frequency conversion speed control device has significant benefits.
The inverter drive has a high energy saving space. At present, many countries have designated flow pressure control to replace the traditional method with a variable frequency speed control device. Article 29, paragraph 2 of the National Energy Law of China also clearly stipulates that the fan pump type load should adopt power electronic speed regulation.
Energy-saving principle of frequency conversion speed regulation energy-saving device
1, frequency conversion energy saving
It can be known from fluid mechanics that P (power) = Q (flow) ╳ H (pressure), the flow rate Q is proportional to the primary of the rotational speed N, the pressure H is proportional to the square of the rotational speed N, and the power P is proportional to the cube of the rotational speed N If the efficiency of the water pump is constant, when the required flow rate is required to decrease, the speed N can be proportionally decreased, and at this time, the shaft output power P has a square relationship. That is, the relationship between the power consumption of the pump motor and the rotational speed is approximately proportional. For example, the power of a pump motor is 55KW. When the speed drops to 4/5 of the original speed, the power consumption is 28.16KW, and the power saving is 48.8%. When the speed drops to 1/2 of the original speed, the power consumption is The amount is 6.875KW, saving 87.5%.
2, power factor compensation energy saving
Reactive power not only increases the line loss and heat of the equipment, but more importantly, the power factor decreases, which leads to the reduction of the active power of the grid. A large amount of reactive power is consumed in the line, the equipment is inefficient and wasteful, by the formula P=S ╳ COSФ, Q=S╳SINФ, where S-apparent power, P-active power, Q-reactive power, COSФ-power factor, it can be seen that the larger the COSФ, the larger the active power P, the power factor of the ordinary pump motor is Between 0.6 and 0.7, after using the variable frequency speed control device, due to the internal filter capacitor of the inverter, COS Ф≈ 1, which reduces the reactive power loss and increases the active power of the power grid.
3, soft start energy saving
Since the motor is directly started or Y/D started, the starting current is equal to (4-7) times the rated current, which will cause serious impact on the electromechanical equipment and the power supply grid, and will also require too much power grid capacity to be generated at startup. The large current and vibration damage the baffles and valves greatly, which is extremely detrimental to the service life of equipment and pipelines. After using the variable frequency energy-saving device, the soft start function of the inverter will start the starting current from zero, and the maximum value will not exceed the rated current, which will reduce the impact on the power grid and the power supply capacity, and prolong the use of equipment and valves. life. Saves on equipment maintenance costs.
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