What treatment of frost cracking of heat exchangers in new wind turbines?

- Sep 14, 2018-

The new wind turbines generally operate under severe cold weather. Due to the low temperature, the heat exchangers are easily cracked, affecting the entire air conditioning system and causing unnecessary economic losses to the enterprise. Below, a brief introduction will be made on several common new wind turbine heat exchanger freeze cracking faults and treatments.

1.Temporary pipelines supply water to the new wind turbine unit without flushing

  Some enterprises often use the new air blower group for temporary heating in order to catch up with the construction period. However, due to time constraints, the entire heating system is not officially flushed with water. The return water supply pipes are all connected by the main branch pipe. The result is that the dirt in the pipeline is at the heat exchange station. Recently, the heaters of the new wind turbines have been continuously deposited, and the flow of hot water has been continuously reduced, which has caused the heater to freeze. In essence, the temporary water supply pipeline was not flushed according to the construction regulations during the construction and blindly used to cause the cracking of the heater.

2. The valve position indicated by the self-control valve is incorrect.

  Sometimes the new fan unit can operate normally before the new fan unit automatic control system is activated. After the activation, the freezing crack occurs. This is because the misoperation of the installation makes the water valve opening and closing indication position of the new fan unit the opposite of the computer indication of the automatic control system. The water supply of the new air unit is actually the current interruption state indicated by the automatic control system, which causes an accident. Therefore, when the outdoor temperature drops below 0 °C, the air conditioning system should be kept as stable as possible. The self-controlled installation and commissioning of the water system should be arranged in other seasons to avoid accidents caused by debugging errors.

  3. When the new fan unit is deactivated in winter, there is water in the air cooler.

  Sometimes the cold air blower accident occurred after the decommissioning of the new air blower unit in the basement, mainly due to the presence of water in the air cooler of the new air blower group. In the new wind turbine unit, the DN15 vent pipe was added at the highest point of the water supply riser. The new fan unit can be used for deflation and drainage, especially to ensure the thoroughness of the water discharge; a set of valves is added to the supply and return pipe of the new fan unit to completely cut off the slow seepage problem after the shutdown.

4. The new fan unit self-control antifreeze protection device loses control when manually adjusting the heater flow

The fresh air conditioning unit must ensure the rated water flow during the winter operation. If the heater water flow is too small, it will cause a freezing crack. In the cold weather in winter, the air conditioning load in the basement is small. When the operator finds that the room temperature is too high, the water flow rate of the heater of the new fan unit is adjusted very low due to the rush to lower the temperature. At this time, the self-control antifreeze protection device of the new fan unit fails. If the outdoor temperature is lower than 0 °C, the heater freeze cracking is likely to occur.

The above-mentioned four new fan unit heat exchanger freeze-fracture faults are caused by the negligence of the operator during construction, commissioning and operation. Remind everyone that when carrying out the relevant operation of the new wind turbine group, it is necessary to pay attention to the detailed inspection and use. If necessary, it can be used. Fans, electric heaters, duty fans and other facilities to prevent the new fan unit heaters from freezing and cracking, to ensure the safe operation of the new fan unit.