High Temperature Inlet Distributor for Fluidized Bed Reactors
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Solution Overview
Problem
Existing fluidized bed reactors face challenges in enhancing fluid and solids interaction, as conventional methods often rely on obstructive structures that can limit fluid flow and mixing efficiency, especially at high temperatures and velocities.
Innovation Solution
A system with serially stacked pipe assemblies and nozzles that distribute high-temperature, high-velocity fluid circumferentially and axially into a chamber, promoting mixing without internal structures, and utilizing a dual layer refractory system for heat containment and wear resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional obstructive structures are used in fluidized bed reactors, then fluid flow and mixing efficiency are limited, but structural support and flow distribution are provided
Solution Approach 1:
The patent removes conventional obstructive internal structures (baffles, mixers, distributors) from the reactor chamber and extracts the flow distribution function to the inlet region. The fluid is pre-distributed through multiple nozzles before entering the chamber, eliminating the need for internal obstructive structures while maintaining or enhancing fluid-solids interaction efficiency.
Solution Approach 2:
The inlet fluid stream is segmented into multiple separate jets through arrays of nozzles. This segmentation allows the fluid to be introduced at multiple discrete locations and directions, creating enhanced mixing and fluidization without requiring a single complex internal structure. The segmented jets naturally interact with solids throughout the chamber volume.
2Productivity
If high velocity fluid is used to fluidize solids, then fluidization efficiency is improved, but wear and heat damage increase
Solution Approach 1:
A refractory liner acts as an intermediary protective layer between the high-velocity hot fluid and the reactor walls. This mediator absorbs and distributes the mechanical impact and thermal load, protecting the structural materials from direct wear and heat damage while allowing the high-velocity fluid to maintain its fluidization function.
Solution Approach 2:
The reactor incorporates composite material systems including refractory liners combined with metallic structural components. The refractory material provides wear and heat resistance, while the metallic structure provides mechanical strength. This composite approach allows the system to withstand the harsh conditions created by high-velocity hot fluid without sacrificing fluidization efficiency.
3Stability of the object's composition
If uniform flow distribution is achieved through multiple nozzles, then mixing efficiency is improved, but device complexity increases
Solution Approach 1:
The nozzle arrays are arranged in three-dimensional configurations with multiple nozzles positioned at different heights, radial locations, and angles. This spatial distribution in multiple dimensions creates uniform flow patterns throughout the chamber volume without requiring complex internal structures. The dimensional arrangement of simple nozzle elements achieves the mixing effectiveness that would otherwise require complex mechanical mixers or distributors.
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
This configuration enables efficient fluidization and mixing of materials at extreme temperatures, overcoming the limitations of conventional systems by ensuring uniform flow distribution and maintaining structural integrity under high heat and abrasive conditions.
Implementation Method 1
A hot fluid, which can be a fluid, liquid, or mixtures thereof, and which can include entrained particles, is passed through the granular material at a sufficiently high velocity to cause the solids to behave as a fluid.
Implementation Method 2
a dual layer refractory system associated with each of the pipe assemblies
Data Source
AI summary
A system for processing one or more materials includes a processor having a shell defining a chamber and a plurality of serially stacked pipe assemblies. Each pipe assembly includes a header having at least one substantially straight pipe section receiving a fluid; and a plurality of nozzles in fluid communication with and projecting downwardly from the header. The nozzles direct the fluid into the chamber of the processor.