Interconnected Fluidized Bed Solid Circulation Control
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Solution Overview
Problem
Current methods for controlling the circulation rate of solids in interconnected fluidized beds are limited, preventing optimal operation and efficiency in chemical looping processes, as they only allow adjustment of total feed amount and gas velocity, lacking the ability to dynamically adjust the circulation rate in real-time or according to changing conditions.
Innovation Solution
A method that dynamically controls the circulation rate of solids by adjusting multiple parameters, including the height difference between the orifice and bed surface, cross-sectional area of the orifice, height of the weir, fluid entering rate, and solid quantity/type, allowing for flexible and real-time adjustments to optimize the circulation rate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If only total feed amount and gas velocity are adjusted, then the control method is simple, but the circulation rate of solids cannot be dynamically controlled to meet changing load requirements
Solution Approach 1:
The patent implements dynamic control of the circulation rate of solids by making the orifice height adjustable rather than fixed. The orifice is positioned at a adjustable height on the weir structure, allowing the system to adapt to changing load requirements by modifying the height difference between the orifice and bed surface, thereby enabling real-time optimization of solid circulation without overcomplicating the overall system
Solution Approach 2:
The patent changes the physical parameter of the orifice height to control the circulation rate. By adjusting the height difference between the orifice and the bed surface, the system modifies the flow characteristics of solids through the orifice, enabling dynamic control of circulation rate. This parameter change approach provides flexibility while maintaining relatively simple system architecture
2Productivity
If the circulation rate of solids is increased to improve productivity, then the reaction completion may be compromised due to excessively short retention time
Solution Approach 1:
The adjustable orifice height enables dynamic balancing between circulation rate and retention time. By optimizing the height difference, the system can achieve the optimal circulation rate that maintains sufficient residence time for reaction completion while maximizing productivity. This dynamic adjustment capability allows the system to adapt to different operational requirements and prevent premature solid exit
Solution Approach 2:
The patent designs the orifice position and height in advance to pre-establish optimal flow conditions. The preliminary configuration of the orifice height on the weir structure ensures that solids have adequate retention time for reaction completion before circulation begins, preventing premature exit while maintaining high circulation rates
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
Enables increased and optimized circulation rates of solids, preventing premature solid exit and enhancing the efficiency of chemical looping processes by allowing for precise control of the solids' retention time in each bed region, thereby improving the overall operation of interconnected fluidized beds.
Implementation Method 1
feed fuel into a fuel reactor for proceeding reduction reaction with the added oxygen carrier MexOy at 900-950° C. The fuel is thus oxidized to CO2 and H2O, while MexOy is reduced to MexOy−1
Implementation Method 2
The reduced MexOy−1 is then sent into an air reactor for proceeding oxidation reaction with oxygen at 500-700° C. and converted back to MexOy
Implementation Method 3
The interconnected fluidized bed integrates a plurality of circulating fluidized bed and several solid transport pipes, in which the various reaction processes are accomplished by transporting solids among multiple fluidized beds at different fluidized speeds
Data Source
AI summary
The present invention provides a method for dynamically controlling the circulation rate of solids in an interconnected fluidized bed. When an interconnected fluidized bed is operating, it is available to control the circulation rate of solids by adopting the steps of adjusting the height difference between the orifice on the weir and the bottom surface of the bed region, adjusting the cross-sectional area of the above orifice, or adjusting the height of the above weir. By using multiple ways, the circulation rate of solids can be improved substantially. In addition, the curve of circulation rate of solids can be converged to the maximum circulation rate of solids effectively.