在定向循环养护坑中,喷嘴不仅是蒸汽入坑的通道,更主要还是获得定向强制循环推动力的关键设施。理论分析和两年多的推广应用实践表明,在定向循环回路正确的情况下,能否依据具体情况,正确地确定喷嘴数量和尺寸及充分地利用该工 In the directional cycle conservation pits, the nozzle is not only the passage for steam to enter the pit, but also is the key facility for obtaining the directional forced circulation driving force. Theoretical analysis and more than two years of popularization and application practices have shown that, in the case of correct directional circulation loops, the number and size of nozzles can be correctly determined and the number of nozzles can be fully utilized, depending on the specific conditions.