Annular Distributor Guide Vane for Reactor Flow Uniformity
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Solution Overview
Problem
Multitubular catalytic reactors experience hot spots due to nonuniform heat medium distribution, leading to reduced heat transfer efficiency and catalyst degradation, which existing methods fail to adequately address by merely adjusting slit openings in the annular distributor.
Innovation Solution
The introduction of a guide vane system within the annular distributor, comprising three types of vanes, to manage fluid flow and distribute heat medium uniformly, thereby enhancing heat transfer efficiency and reducing localized temperature rises.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the number and size of slit openings in the annular distributor are adjusted, then the flow distribution can be modified, but the local heat transfer efficiency cannot be enhanced to a desirable value
Solution Approach 1:
The annular distributor is segmented into multiple functional zones using baffle plates and guide vanes. The distributor includes a first annular distributor section with slits for radial flow and a second annular distributor section with openings for axial flow, creating distinct flow paths that can be independently optimized for both uniformity and heat transfer efficiency.
Solution Approach 2:
Different sections of the annular distributor are designed with different structural characteristics to address local requirements. The first section uses slit openings for uniform radial distribution, while the second section uses larger openings with guide vanes for enhanced axial flow and heat transfer in specific regions, allowing each zone to optimize its local performance.
2Device complexity
If conventional annular distributor design is used, then结构简单 (structure is simple), but flow rate distribution is nonuniform causing hot spots
Solution Approach 1:
The distributor is divided into multiple functional sections with baffle plates creating distinct flow zones. This segmentation allows independent control of flow patterns in different regions, preventing hot spots by ensuring uniform heat medium distribution throughout the reactor while maintaining a manageable structural complexity through modular design.
Solution Approach 2:
Guide vanes are introduced as intermediary elements between the openings and the reaction tubes. These vanes redirect and smooth the flow of heat medium, eliminating turbulence and nonuniformity that would cause hot spots, while the baffle plates act as intermediaries to separate and organize different flow paths within the distributor structure.
3Productivity
If heat medium flow is increased to improve heat transfer, then heat transfer efficiency improves, but flow disturbance and nonuniformity increase
Solution Approach 1:
The distributor design allows different sections to handle different flow requirements. The first annular section with radial slits provides stable, uniform distribution, while the second annular section with axial openings and guide vanes handles higher flow rates for enhanced heat transfer in regions needing additional cooling, maintaining overall flow stability while enabling localized high-performance heat transfer.
Solution Approach 2:
Guide vanes serve as intermediary flow control elements that redirect high-velocity heat medium flow into smoother, more uniform patterns. The vanes reduce turbulence and flow disturbance while maintaining high flow rates, allowing improved heat transfer efficiency without sacrificing flow uniformity and stability.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The guide vane system ensures uniform fluid flow distribution, increases heat transfer efficiency, and suppresses hot spots, leading to improved reactor performance and extended catalyst lifespan.
Implementation Method 1
at least one guide vane which directs a flow rate of the fluid supplied from the duct or collects a flow rate of the fluid discharged to the duct
Implementation Method 2
heat medium circulates through a reactor shell so that the chemical reaction can take place in an optimum condition
Implementation Method 3
efficiently removing heat produced in reaction
Data Source
AI summary
Disclosed is an annular distributor having: an annular slit layer that is mounted on an inner circumferential surface of the annular distributor and has at least one slit discharging or introducing a fluid; at least one opening that is formed on an outer circumferential surface of the annular distributor and is connected with any one of a fluid supply duct and a fluid discharge duct; and at least one guide vane selected from three types of guide vanes that are installed in the annular distributor, and splits a flow rate of the fluid supplied from the duct or collects a flow rate of the fluid discharged to the duct. And disclosed are a reactor or heat exchanger has the annular distributor, and a method of producing unsaturated aldehyde or unsaturated acid from olefin by catalytic gas phase oxidation in the reactor.