Sliding Valve Guide Element Wear Reduction
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Solution Overview
Problem
The existing slide valves used in FCC systems for regulating catalyst flow suffer from significant wear on pipe-side guide elements due to high-speed and high-temperature catalyst flows, leading to frequent replacements every three years.
Innovation Solution
The slide valve design positions pipe-side guide elements in front of the outlet opening, outside the area of high turbulence, and integrates these elements into the orifice plate, using L-shaped or inverted L-shaped guide elements for reliable guidance and easy manufacturing, while plate-side guide elements are detachably connected for easy maintenance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If pipe-side guide rails are arranged to protrude into the flow cross-section for engagement with slide plate guide rails, then reliable lateral guidance of the slide plate is achieved, but the guide rails are severely damaged by the abrasive catalyst flow
Solution Approach 1:
The pipe-side guide rails are extracted from the flow cross-section area and repositioned on the outer circumference of the pipe, removing them from the harmful catalyst flow while preserving their guidance function through engagement with plate-side guide rails on the slide plate
Solution Approach 2:
The guide rail arrangement transitions from a two-dimensional in-plane configuration to a three-dimensional arrangement where pipe-side guide rails are positioned on the outer pipe circumference, utilizing the radial dimension to place guide elements outside the flow path
2Reliability
If the slide plate is lengthened to cover pipe-side guide elements in the orifice area, then guide element protection is improved, but the valve size increases
Solution Approach 1:
The pipe-side guide rails are extracted from the orifice flow area and repositioned on the outer pipe circumference, eliminating the need for extended slide plate coverage while maintaining guidance functionality through the repositioned guide rail arrangement
3Manufacturing precision
If guide elements are positioned in the high turbulence area for effective flow control, then flow regulation precision is improved, but wear on guide elements increases
Solution Approach 1:
The pipe-side guide rails are extracted from the high turbulence flow area and repositioned on the outer pipe circumference, separating the guidance function from the flow control function to eliminate wear while preserving flow regulation precision through the orifice plate geometry
Data Source
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AI summary
u The sliding valve comprises a tubular section (10) and a diaphragm (11) which is arranged within it and also has an inlet and an outlet (12a, 12b) through which a medium flows during operation. The valve also consists of a sliding plate (13) that interacts with the outlet (12b) in order to regulate the catalyst flow and can be displaced into an open or closed position I, II. The sliding plate is displaceably mounted via meshed guiding elements (14, 15) arranged on the tube side and the plate side. The tube side guiding elements are arranged upstream of the outlet in the flow direction.