Using the intermittent reversal of the counter-current air-cooling condenser fan to thaw the heat-dissipating tube bundle of the counter-current air condenser

In the operation of condensed water under subcooling conditions, when the ambient temperature is lower than the empty design temperature, in order to avoid the turbine back pressure is too low, the local condensation of the air condenser tube bundle is prevented, and the operation mode of the air cooling fan group is adjusted. The speed of the air cooling fan reduces the amount of cooling air entering the air condenser.

By using the reverse reversal of the counter-current air-cooling condenser fan, the application technology AppliedTechnology can suppress the cooling of the internal tube bundle steam of the counter-current air condenser by the natural cold air or withdraw the hot air above the air condenser, which is sufficient for the counter-current air condenser. The heat pipe bundle is thawed. During the operation, the following optimization measures were taken: the counterflow fan was reversed at 22.5 r/min for about 5 min at an interval of 30 min, and the remaining fans continued to operate, so that the core tube of the countercurrent condensing tube bundle was warmed up and heated, so that the melting may have The formation of ice. First, the 3/5-row counterflow fan in the 1/8th column is stopped, and after 3 minutes and 5 minutes idling, it is switched to reverse at 22.5 r/min. After 5 minutes of warm-up time, the fan was stopped again for 3 min 5 min, and the speed of the fan was adjusted to the same speed as the other fans in the column. Then the reverse flow fan in the 2nd/7th column is reversed, and the steps are the same as before. The other rows of counterflow fans then operate as such.

If the ambient temperature is lower than -15 °C, the reversing fan reheat interval is 15 min. 4 Unit economic analysis In the design stage, different fan models are optimized according to different ITD values ​​and different oncoming wind speeds, and finally the domestically produced fan is used. The scheme ensures strong wind resistance when the wind speed is high.

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