Multi-tier Grid Structure for Fluid Solids Contacting Device
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Solution Overview
Problem
In fluid bed systems, low superficial gas velocities lead to bubble formation, reducing gas-solid contact efficiency, and existing solutions like subway grating require precise control of open area and spacing to prevent flooding and ensure effective catalyst conditioning and dehydrogenation processes.
Innovation Solution
A fluid solids contacting device with a grid structure supported by a base and chairs, featuring grid assembly sections with optional diagonal supports and attachment straps, designed to break bubbles and maintain structural integrity under high temperatures, allowing for controlled gas velocities and preventing flooding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If subway grating is used to break bubbles and improve gas-solid contact, then gas-solid contact efficiency is improved, but the open area is reduced and gas velocity control becomes restricted
Solution Approach 1:
The grid structure is divided into multiple grid assembly sections that can be independently arranged to achieve the desired bubble-breaking effect while maintaining adequate open area. The segmentation allows optimization of both contact efficiency and flow capacity.
Solution Approach 2:
Different regions of the grid structure have different open areas and grid configurations tailored to local flow conditions. This allows high bubble-breaking efficiency in critical zones while maintaining higher open area in regions where gas velocity control is less critical.
2Reliability
If grid structure spacing is reduced to prevent gas streaming, then gas distribution is improved, but structural stress increases under high temperatures
Solution Approach 1:
The grid assembly sections incorporate expansion joints and flexible connections that allow the structure to accommodate thermal expansion and contraction. This maintains tight spacing for uniform gas distribution while preventing excessive stress accumulation under high-temperature conditions.
Solution Approach 2:
The base and grid structure incorporate movable elements that can dynamically adjust to thermal movements, maintaining structural integrity and gas distribution uniformity across varying temperature conditions.
3Productivity
If grid assembly sections are added to improve bubble breaking, then mass transfer is enhanced, but device complexity increases
Solution Approach 1:
The grid assembly sections are designed as universal, multi-functional units that perform bubble breaking, gas distribution, and structural support functions simultaneously. This modular approach enhances mass transfer efficiency while minimizing the increase in overall device complexity through standardized components.
Solution Approach 2:
The grid assembly sections are nested within the existing vessel structure, utilizing available space efficiently. The modular design allows integration without requiring proportionally increased structural support systems, thereby limiting the increase in device complexity.
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 device enhances gas-solid contact efficiency, prevents flooding, and supports high-temperature operations by breaking bubbles and maintaining structural integrity, optimizing catalyst conditioning and dehydrogenation processes while reducing catalyst inventories and operating costs.
Implementation Method 1
subway grating is an excellent choice as it breaks large bubbles into small bubbles
Data Source
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AI summary
A fluid solids contacting device comprising a vessel; one or more grid structures comprising two or more levels, wherein each level comprises a plurality of grid assembly sections; a base formed from structural members used to support the multi-tiered structure; and three or more chairs attached to an inside surface of the vessel and spaced apart to support the base; and wherein the base is supported by the chairs is provided.