Fluidized Bed Cooler Regional Coordination
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Solution Overview
Problem
Existing fluidized bed coolers face limitations in heat exchange efficiency due to localized enhancements, and internal stability is compromised by the impact and wearing of solid catalyst particles on heat exchange tubes, restricting stable operation.
Innovation Solution
A fluidized bed cooler with regional coordination enhancement, featuring a cylindrical shell with specific regional distributions and baffle plates, a regional particle distributor, and double gas distributors, which improves uniform distribution and heat exchange efficiency by optimizing the flow and residence time of catalyst particles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If local renewal frequency of catalyst particles is increased by welding fin structures on heat exchange tubes, then heat transfer efficiency is improved, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent applies local quality by installing baffle plates at specific locations where catalyst particle flow characteristics differ (catalyst inlet influence region, dense phase region, gas distributor influence region). Each region receives targeted structural enhancement rather than uniform modification throughout the entire cooler, optimizing heat transfer where needed while maintaining simplicity elsewhere.
Solution Approach 2:
The patent segments the fluidized bed cooler into distinct functional regions (catalyst inlet influence region, dense phase region, gas distributor influence region, dilute phase region) and applies different baffle plate configurations to each segment. This allows targeted improvement of heat transfer efficiency in specific regions without complicating the entire device structure.
2Productivity
If baffle plates are installed to improve flow field and increase catalyst residence time, then heat exchange efficiency is enhanced, but device complexity and pressure drop increase
Solution Approach 1:
Baffle plates are strategically installed only in regions where catalyst flow characteristics require improvement (catalyst inlet influence region, dense phase region, gas distributor influence region) rather than throughout the entire cooler. This localized approach enhances heat exchange efficiency in critical areas while minimizing added structural complexity and pressure drop.
Solution Approach 2:
The cooler is divided into functional zones with baffle plates applied selectively to specific segments. The catalyst inlet influence region, dense phase region, and gas distributor influence region each receive appropriate baffle plate configurations tailored to their specific flow characteristics, avoiding unnecessary structural additions in regions that already have adequate flow patterns.
3Device complexity
If catalyst inlet structure is simplified without regional distribution devices, then device complexity is reduced, but catalyst distribution uniformity and heat exchange efficiency deteriorate
Solution Approach 1:
A regional particle distributor is installed specifically in the catalyst inlet influence region to improve catalyst distribution uniformity. This localized device addresses the distribution problem at the inlet without requiring complex modifications throughout the entire cooler structure, maintaining simplicity elsewhere while achieving uniform catalyst distribution.
Solution Approach 2:
The catalyst inlet system is segmented into a regional particle distributor component that handles distribution uniformity, while the rest of the cooler maintains a simpler structure. This allows the inlet structure to be optimized for catalyst distribution without unnecessarily complicating the overall device.
4Productivity
If heat exchange tubes are exposed directly to catalyst particles, then heat transfer contact area is maximized, but tube erosion and wearing increase reducing reliability
Solution Approach 1:
Baffle plates are installed in the catalyst inlet influence region and dense phase region where catalyst particle velocity and impact are highest. These baffle plates act as protective barriers that reduce direct particle impact on heat exchange tubes in the most erosive zones, while allowing tubes in less severe regions to maintain maximum heat transfer contact area.
Solution Approach 2:
Baffle plates serve as intermediary structures between catalyst particles and heat exchange tubes. They intercept and redirect high-velocity catalyst particles, reducing direct impact on tubes while allowing continued heat transfer through the fluidized bed medium, thus protecting tubes without significantly reducing heat transfer effectiveness.
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 solution enhances the internal stability and heat exchange efficiency of the fluidized bed cooler by uniformly distributing catalyst particles and coordinating the heat exchange process across regions, leading to stable and efficient operation.
Implementation Method 1
A plurality of heat exchange tubes are usually provided inside a fluidized bed cooler to form a heat exchange tube bundle, and a flow of catalytic cracking solid particles in a shell is utilized to exchange heat with heat removing mediums in the heat exchange tubes
Implementation Method 2
a flow of catalytic cracking solid particles in a shell is utilized to exchange heat with heat removing mediums in the heat exchange tubes
Implementation Method 3
a flow of catalytic cracking solid particles in a shell is utilized to exchange heat with heat removing mediums in the heat exchange tubes
Data Source
AI summary
The present disclosure discloses a fluidized bed cooler with regional coordination enhancement, comprising a shell, a catalyst inlet, an interior of the shell is divided into a catalyst inlet influence region, a dilute phase region, a dense phase region and a gas distributor influence region; a catalyst inlet inclined tube is provided obliquely upward at the catalyst inlet, and a regional particle distributor is provided at the catalyst inlet; the dense phase region is provided with a plurality of dense phase baffle plates, and the dilute phase region is provided with a plurality of dilute phase baffle plates; and the gas distributor influence region is provided with double gas distributors. The fluidized bed cooler simultaneously well solves the low internal stability and the low heat exchange efficiency of the fluidized bed cooler, thereby realizing the stable and efficient operation of the fluidized bed cooler.