The prefabrication of riser in nozzle section, the prefabrication of nozzle easing, the welding of easing &riser and the installation of nozzle were introduced in detail with this paper.

• 其喷嘴为改造的重要部分,采取喷嘴套筒与提升管整体预制的方法,达到了预期的效果。