preheating

v.预热

The processes of preheating and welding of super scale penstocks were detailed. 本文详细叙述了巨型压力钢管的预热装配和焊接过程。

Condensate from the first-effect calandria is used for preheating the feed. 一效列管换热器中出来的冷凝液被用来预热进料。