Reducer Supply Layout for Compact NOx Catalyst Maintenance
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Solution Overview
Problem
Conventional reducer supply devices for NOx purification catalysts in ships require complex pipe connections, are prone to air accumulation, and compromise maintainability due to compactness, necessitating a more efficient and maintainable design.
Innovation Solution
The reducer supply device includes offset arrangement of key units (flow rate adjustment and pressure-feeding units) with a bottom member, non-electric components, and strategic placement of inlet and outlet ports to facilitate compactness and maintainability, preventing spills from affecting electric components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the reducer supply device is made compact to fit smaller ships, then the device size is reduced, but maintainability deteriorates due to limited access for maintenance operations
Solution Approach 1:
The patent applies vertical stacking arrangement where the flow rate adjustment unit and pressure-feeding unit are positioned at different vertical levels (upper and lower positions) within the compact device housing. This three-dimensional arrangement reduces the horizontal footprint while maintaining adequate access space for maintenance operations from above or below, effectively resolving the contradiction between compactness and maintainability.
2Ease of manufacture
If individual units are connected by pipes in a shipyard, then the device can be assembled on-site, but air accumulation occurs in the pipes and connection complexity increases
Solution Approach 1:
The patent integrates the flow rate adjustment unit and pressure-feeding unit into a single pre-assembled reducer supply device with internal connections already established. This merging of components eliminates the need for on-site pipe connections, thereby preventing air accumulation in connecting pipes while reducing overall device complexity for installation.
3Area of stationary object
If the reducer supply device is arranged compactly, then space is saved on smaller ships, but maintenance operations become difficult due to limited access
Solution Approach 1:
The patent divides the reducer supply device into distinct functional units (flow rate adjustment unit and pressure-feeding unit) that are vertically separated. This segmentation allows maintenance personnel to access and service each unit independently from above or below, maintaining ease of operation despite the compact horizontal footprint required for smaller ships.
Data Source
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AI summary
[Problem] To provide a reducer supply device that can be made compact and has excellent maintainability. [Solution] The reducer supply device 10 includes a nozzle unit 11 that adjusts a flow rate of a reducer which is to be supplied to a NOx purification catalyst device 2; and a pump unit 12 that supplies the reducer to the nozzle unit 11. The nozzle unit 11 and the pump unit 12 are arranged at positions offset from each other in top view.