Inverter in condenser pump
Tags: inverter, water supply
This application is about China-made cell-cascade multi-level medium-voltage frequency inverter system on 2 # Unit Condensate water system, makes a comparison of energy saving before and after the reform. The results showed that the main auxiliary equipment in power plant using medium-voltage inverter system is feasible, with quick pay-back and other characteristics. Inverter has a positive significance to reduce power consumption.
Preface
A Chinese factory has two units of air-cooling system of 300MW. Inverter is manufactured by Shenzhen Gozuk Co., Ltd. Pump adopt mode of "one work, one standby". Water level of deaerator is adjusted by damper. We have a discussion about inverter application according to the actual situation of # 2 Unit condenser Pump reform in the plant.
Operating Conditions
To ensure continuous and stable operation of condenser pump is an important factor of power generating units security.
Condenser system is shown in following:
Principle of system is shown in following:
After the inverter reform, during normal operation, adjust inverter output frequency to change the speed of Condenser pump, to adjust flow and control the water level of deaerator. Following is condenser control program.
The effect of Energy-saving
1) The power saving is remarkable in the plant
As shown in Table 1:
Table 1:inverter current before and after the reform
Table 2:Saving Statistics
As each unit run 300 days a year, according to the power price 0.25 Yuan / kWh. 605000 Yuan (USD 88970) is saved.
2) Reduce the impact current when the motor starts
Observing the load curve, we find no impact current when the inverter starts. The current rises from zero with speed increasing and never exceeds the rated current in any cases. Therefore, inverter solves the large current impact issue when the motor starts, eliminates a large starting current to the motor, significantly reduces the costs of routine maintenance. Here is starting current trend (Initial Speed: 900r/min).
3) Extend equipment life
Using the inverter can change the motor speed along the condenser pump characteristic curve, extend the life of the bearing. Data shows that reducing condenser pump speed can prolong life of condenser pump. So cost would naturally be reduced.
4) Reduce noise
After the reform, not only pump speed is down but also the noise dramatically lowers. Condenser pumps operating conditions have improved significantly.
Conclusion
The successful application of inverter on condenser system fully shows that inverter control technology has a broad application prospects and development potential with significant energy-saving effect, good system response and quality of control. It has a positive significance in improving the competition power of enterprises and reducing cost.
For inverter reform project in 2 × 300MW units, Gozuk makes full electrical system design, DCS logic design, system commissioning, construction and other technical services. Gozuk provides a comprehensive and effective technical support services for the implementation of the project to achieve energy-saving. The inverter optimizes the system operation process, protects system security, improves energy efficiency and other economic benefits.
Preface
A Chinese factory has two units of air-cooling system of 300MW. Inverter is manufactured by Shenzhen Gozuk Co., Ltd. Pump adopt mode of "one work, one standby". Water level of deaerator is adjusted by damper. We have a discussion about inverter application according to the actual situation of # 2 Unit condenser Pump reform in the plant.
Operating Conditions
To ensure continuous and stable operation of condenser pump is an important factor of power generating units security.
Condenser system is shown in following:
Principle of system is shown in following:
After the inverter reform, during normal operation, adjust inverter output frequency to change the speed of Condenser pump, to adjust flow and control the water level of deaerator. Following is condenser control program.
The effect of Energy-saving
1) The power saving is remarkable in the plant
As shown in Table 1:
Unit Load (MW) | 200 | 210 | 220 | 230 | 240 | 250 | 260 | 270 | 280 | 290 | 300 |
Pump Current (Before Reform) | 81.8 | 84.2 | 85.4 | 88.0 | 90.6 | 91.1 | 93.9 | 94.5 | 95.0 | 95.8 | 98.2 |
Pump Current (After Refore) | 29.0 | 30.5 | 36.0 | 43.0 | 48.0 | 50.0 | 52.0 | 56.0 | 70.0 | 72.0 | 82.0 |
Reduce the current A | 52.8 | 53.7 | 49.4 | 45.0 | 42.6 | 41.1 | 41.9 | 38.5 | 25 | 23.8 | 16.2 |
Table 1:inverter current before and after the reform
Table 2:Saving Statistics
Units | power consumption kW/h | power saving kW/h |
#1 (direct on line) | 307000 | |
#2 (variable frequency) | 186000 | 121000 |
As each unit run 300 days a year, according to the power price 0.25 Yuan / kWh. 605000 Yuan (USD 88970) is saved.
2) Reduce the impact current when the motor starts
Observing the load curve, we find no impact current when the inverter starts. The current rises from zero with speed increasing and never exceeds the rated current in any cases. Therefore, inverter solves the large current impact issue when the motor starts, eliminates a large starting current to the motor, significantly reduces the costs of routine maintenance. Here is starting current trend (Initial Speed: 900r/min).
3) Extend equipment life
Using the inverter can change the motor speed along the condenser pump characteristic curve, extend the life of the bearing. Data shows that reducing condenser pump speed can prolong life of condenser pump. So cost would naturally be reduced.
4) Reduce noise
After the reform, not only pump speed is down but also the noise dramatically lowers. Condenser pumps operating conditions have improved significantly.
Conclusion
The successful application of inverter on condenser system fully shows that inverter control technology has a broad application prospects and development potential with significant energy-saving effect, good system response and quality of control. It has a positive significance in improving the competition power of enterprises and reducing cost.
For inverter reform project in 2 × 300MW units, Gozuk makes full electrical system design, DCS logic design, system commissioning, construction and other technical services. Gozuk provides a comprehensive and effective technical support services for the implementation of the project to achieve energy-saving. The inverter optimizes the system operation process, protects system security, improves energy efficiency and other economic benefits.
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