Moving Bed Reactor Phase Distribution for Three-Phase Flow
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Solution Overview
Problem
Conventional moving bed reactors face difficulties in transferring and managing co-current three-phase flows, leading to uneven distribution, reduced activity, temperature spikes, and catalyst deactivation due to limitations in controlling flow rates and contact time between phases.
Innovation Solution
A moving bed reactor design with an annular outer volume, solids volume, and central conduits, featuring distributor plates with angled orifices for controlled introduction of liquid and gas, allowing for separate and uniform phase distribution, and a stripping gas system for efficient separation and recombination of phases.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional methods are used to transfer three-phase flow in moving bed reactors, then the reactor structure is simple, but the flow distribution becomes uneven leading to reduced activity and temperature spikes
Solution Approach 1:
The reactor is divided into multiple zones with separate inlet conduits for gas, liquid, and solid phases. Each phase has dedicated distribution systems with multiple inlet points arranged axially and radially, allowing independent control and uniform distribution of each phase throughout the reactor volume.
Solution Approach 2:
Different regions of the reactor are equipped with phase-specific inlet conduits positioned at optimal locations. Gas inlets are arranged to distribute uniformly across the cross-section, liquid inlets are positioned to ensure axial distribution, and solid inlets are configured for radial distribution, creating locally optimized flow patterns throughout the reactor.
2Reliability
If conventional transfer methods are used, then the reactor design is straightforward, but catalyst deactivation increases due to poor flow management
Solution Approach 1:
The flow distribution system is segmented into separate gas, liquid, and solid phase inlet systems, each with multiple conduits positioned at different axial and radial locations. This allows independent optimization of each phase's distribution to ensure uniform contact with catalyst particles, preventing localized overheating and catalyst deactivation.
Solution Approach 2:
Phases are pre-distributed through dedicated inlet conduits before entering the reaction zone. Gas is distributed uniformly across the cross-section, liquid is distributed axially, and solids are distributed radially, ensuring that catalyst particles are uniformly exposed to all phases from the beginning of the reaction, preventing hot spots and catalyst degradation.
3Speed
If counter-current flow reactor is used to handle three-phase flow, then the flow management capability improves, but the residence time becomes too high for reactions requiring short contact time
Solution Approach 1:
Instead of using counter-current flow where phases move in opposite directions, this invention employs co-current flow where gas, liquid, and solid phases all move in the same axial direction. This inversion of the flow pattern allows for shorter residence times while maintaining effective phase contact, suitable for reactions requiring rapid processing.
Solution Approach 2:
The system allows dynamic control of phase flow rates through independently adjustable inlet systems. By optimizing the velocity of each phase and their ratios, the residence time can be precisely controlled to match reaction requirements, enabling short contact times while maintaining effective three-phase interaction.
4Duration of action of moving object
If co-current flow is used in moving bed reactor, then the contact time can be reduced, but the flow distribution becomes uneven without proper distribution systems
Solution Approach 1:
The co-current flow system is equipped with segmented distribution networks for each phase, with multiple gas inlet conduits arranged radially and axially, multiple liquid inlet conduits positioned at different heights, and multiple solid inlet conduits for radial distribution. This segmentation ensures uniform flow distribution throughout the reactor volume, enabling short contact times without sacrificing distribution uniformity.
Solution Approach 2:
Each phase has locally optimized inlet positions and distribution patterns tailored to its specific flow characteristics. Gas inlets are positioned to ensure uniform radial distribution, liquid inlets are arranged for axial distribution, and solid inlets are configured for radial flow, creating locally uniform flow patterns that collectively achieve uniform distribution throughout the entire reactor.
Data Source
AI summary
A moving bed reactor is provided that can allow facilitate performing a reaction involving a three-phase flow under co-axial flow conditions for the solid and liquid portions of the three phase flow, while the gas portion of the three-phase flow is exposed to the solids under radial flow conditions. Methods for using such a moving bed reactor to perform a reaction, such as upgrading of a feed to distillate products, are also provided.