Axially Adjustable Rotor Blade Cascade for Rotary Feedstock Processing
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Solution Overview
Problem
Rotary reactor apparatuses for chemical processing of hydrocarbon feedstocks face significant challenges with flow leakages along the circumferential direction, particularly when operating under off-design conditions, leading to reduced efficiency, coke formation, and decreased yields of target products.
Innovation Solution
The apparatus features a rotor with axially adjustable rotor blades relative to stationary vane cascades, allowing for axial displacement of the rotor or stationary components to regulate the position of the rotor blade cascade, thereby minimizing flow leakages and optimizing operating conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the rotor operates at variable flow rates and temperatures, then the reactor can adapt to different operating conditions, but flow leakages occur in circumferential direction reducing efficiency
Solution Approach 1:
The rotor is made axially displaceable relative to the stationary vane cascades, allowing dynamic adjustment of the rotor position in the axial direction. This dynamic positioning enables the rotor to adapt to variable operating conditions (flow rates, temperatures) while maintaining optimal clearance gaps to prevent circumferential flow leakages, thus resolving the contradiction between adaptability and energy loss.
2Ease of operation
If the rotor operates at off-design conditions, then flexibility in operation is improved, but tip-clearance leakage increases causing coke formation and reduced product yield
Solution Approach 1:
The axially displaceable rotor allows operational flexibility by adjusting rotor position under off-design conditions, while simultaneously preventing tip-clearance leakage that leads to coke formation, thus resolving the contradiction between ease of operation and harmful effects.
Solution Approach 2:
The rotor position parameter (axial displacement) is changed to optimize performance under off-design conditions. By adjusting the axial position of the rotor relative to stationary vane cascades, the system adapts to varying operating parameters (flow rate, temperature) while preventing harmful tip-clearance leakages and associated coke formation.
3Device complexity
If conventional fixed rotor design is used, then device complexity is low, but operating efficiency decreases under variable conditions
Solution Approach 1:
The rotor is designed with axial displacement capability, transforming from a fixed to a dynamic configuration. This dynamic design, while increasing device complexity, significantly improves reactor efficiency under variable operating conditions by preventing flow leakages and enabling optimal performance adaptation, thus resolving the contradiction between complexity and productivity.
Data Source
AI summary
A rotary bladed apparatus (100) for processing feedstocks in a process fluid is provided, said apparatus comprises means for adjusting position of a working blade cascade of the rotor (3) relative to stator components (2, 4) in a longitudinal direction of a rotor shaft (1). Adjustment is performed through axial displacement of the rotor (3) or, alternatively, through axial displacement of the reactor housing (22 A, 32A). A method for improving process efficiency and for regulating flow losses during processing of feedstocks in a process fluid, in particular, in off-design conditions in the bladed apparatus (100) is further provided. In embodiments, processing of feedstocks includes thermal- or thermochemical cracking of hydrocarbon-containing feedstock.