light industry

Your factory has a large number of different power of the wind turbine, are used to control the wind, the wind, the energy waste is serious. Now to transform a strong 210KW fan as an example, as follows.
First, the basic situation
Fan power 210KW, using the shutter valve (wind board) to regulate the control of air flow, 24 hours of operation.
Two, the operation of the wind turbine analysis
1 electric energy waste
Fan power 210KW, baffle control damper. Fan speed is constant, the baffle to control the air volume, resulting in the size of the wind and the output of the motor is out of proportion, resulting in a large number of energy waste.
2 the ability to adapt to the load in the production process is poor
Due to the load change, and throttle adjustment in a changing, if volume is not stable, variable changes caused by wind pressure, affect the work efficiency, resulting in the dust separation effect, effect of cement production quality.
3 motor start impact power grid
Motor start using reduced starting mode. During the start-up process, the impact of high voltage and high voltage is 3-4 times, which is a great impact on the power grid. And the operation is complex, the maintenance quantity is big, the equipment failure rate is high, the maintenance cost is high, causes the loss of production loss is big.

    Three. Characteristics and effect of frequency conversion and energy saving of fan system
1 variable frequency modulation of the wind no comparable superiority
Significant energy saving effect. According to the principle of fluid mechanics, the flow rate of Q is proportional to the speed of N, and the required power is proportional to the three Fang Cheng of P. So when the air volume is less than the rated air flow, the speed of the motor is changed, the power of the motor is obviously decreased, and the energy saving effect is obvious.
2 the efficiency of fan is improved
The working efficiency of the fan is calculated by the following formula:
P=C1 (Q/n) -C2 (Q/n) 2
Type of Q for the wind, n for speed, C1C2 constant
Through the throttle control air volume, due to rotational speed n invariant, and lower flow rate Q, so the efficiency ETA P decreased, and through the speed control of air volume, air volume and speed is proportional to, constant ratio (Q/n), so the efficiency ETA P always keep best.
3 the operation is simple and convenient, the maintenance amount is small, the working efficiency of the fan will be greatly improved. And the realization of the range of stepless speed regulation, due to the start, can make the motor continuously smooth and stable transmission.

   Four, benefit analysis
1 save electricity
210KW cited wind machine running 40Hz, for example, the work speed for 80% of the amount of constant speed, fan power consumption annually for the PZ= 0.83Pn=0.512Pn according to production for a period of 12 months, consider all loss calculated to save electricity by 20%.
W=210KW * 30 * 24 * 12 * 20%=362880KW.h.
To 0.5 yuan per kilowatt hour calculation, the annual electricity savings
362880 * 0.5 yuan =181440 yuan
Five, return on investment analysis
The payback period is calculated as follows:
A 280KW according to 180 thousand calculation
The return on investment, the investment cost of electricity saving benefit = =181440 / 180000=100%
The investment payback period of =12 months, the rate of return on investment =12 / 100%=12 months
Above is based on energy saving by 20%, according to the actual energy saving rate range (60% - 20%), so the space is very large. 8 years to calculate the frequency converter life, an investment, long-term benefit.
Six, summary
Transformation of fan:
1 the energy saving transformation of the air pump is simple in structure, convenient in transformation, obvious energy saving effect and short payback period.
2 after using the frequency converter, the fan can start up and stop, reduce the mechanical impact of equipment, prolong the service life of equipment, and reduce the maintenance cost of equipment.
3 frequency control technology advanced, mature, improve the technical content of the equipment.