Abstract: Abstract:The author put forward runback control strategy in order to resolve soaring back pressure of the 600MW direct air cooling unit.Back pressure protection logically system of 600MW subcritical direct aircooling unit were optimized, risks of environmental strong wind may generate hot air back flow above air cooling island and with soaring back pressure, direct aircooling unit may trip were reduced. In this way, the unit safe operation under hostile circumstances of high back pressure were ensured.

Key words: Keywords:direct air cooling unit, back pressure soaring, runback, logical optimization