Opposing-Rotation Dual-Nozzle Sludge Lance for Steam Generator Cleaning

The lance is divided into multiple segments or sections along its length, with nozzles distributed at different positions. This segmentation allows the cleaning function to be distributed across multiple locations, achieving comprehensive cleaning coverage through a single lance rather than requiring multiple concentrated jets, thereby reducing overall fluid demand and reaction forces.

The lance extends in the longitudinal dimension along the tube lane, transforming the cleaning approach from a concentrated point source to a distributed linear source. This dimensional change allows cleaning coverage to be achieved along the length of the tube bundle rather than requiring multiple jets at a single access point, reducing fluid requirements.

The nozzle configuration employs asymmetric positioning and orientation of nozzles along the lance, with nozzles arranged to direct fluid at specific angles relative to the tube bundle geometry. This asymmetric arrangement optimizes cleaning coverage while distributing reaction forces more favorably, preventing excessive cumulative forces that would occur with symmetric multiple-jet configurations.

Instead of directing all cleaning jets in the same direction, the lance configuration uses nozzles pointing in opposite directions along its length. This inversion of jet direction creates opposing reaction forces that cancel each other out, significantly reducing the net reaction force on the lance structure while maintaining comprehensive cleaning coverage.

Multiple nozzles are merged into a single integrated lance structure with unified rotation capability. Rather than rotating individual nozzles or nozzle groups separately, the entire lance assembly rotates as one unit, synchronizing all nozzle movements. This merging approach achieves comprehensive cleaning coverage through coordinated rotation while minimizing device complexity by eliminating the need for multiple independent rotation mechanisms.

The oscillating lance serves multiple functions: it provides longitudinal cleaning coverage through its extended structure, achieves angular coverage through synchronized rotation of all nozzles, and maintains structural integrity as a single supportable unit. This multi-functionality is accomplished with a single rotation mechanism rather than requiring separate mechanisms for each nozzle, reducing overall device complexity.

The lance is segmented into multiple sections along its length, with support features distributed at regular intervals. This segmentation reduces the effective cantilever length of each section, minimizing deflection while maintaining the overall extended configuration needed for access through small openings and along the tube lane.

The lance employs composite construction with high-strength, low-density materials that provide sufficient structural rigidity to resist deflection under operating conditions. This allows the cantilever configuration to extend far enough to access tube lanes through small openings while maintaining adequate structural stability through material properties rather than increased cross-sectional dimensions.