Fluidized Bed Reactor Vertical Indentations
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Solution Overview
Problem
Large high-capacity fluidized bed boilers face structural challenges and inefficiencies due to the need for increased cross-sectional area, leading to non-uniform fluidized bed behavior and difficulties in maintaining homogeneous evaporation of water, especially in the inner corners of the furnace.
Innovation Solution
The introduction of vertical indentations in the side walls of the reactor, which increase the rigidity of the structure, allow for longer horizontal side walls without compromising rigidity, and provide additional space for auxiliary equipment and improved heat transfer surfaces, enabling more efficient heat transfer and uniform fluidized bed behavior.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the cross-sectional area of the furnace is increased to achieve high capacity, then the boiler capacity is improved, but the uniformity of fluidized bed behavior deteriorates
Solution Approach 1:
The furnace cross-section is divided into multiple zones by introducing vertical indentations that create separate fluidized bed zones. This segmentation allows each zone to maintain uniform fluidized bed behavior independently while the overall furnace achieves high capacity through the combined effect of multiple zones operating in parallel.
Solution Approach 2:
Different regions of the furnace are given different structural characteristics through the indentations. The indentations create local zones with specific flow patterns and fluidization characteristics optimized for uniform behavior, while the overall furnace maintains high capacity through the cumulative effect of these localized optimizations.
2Productivity
If the height of the boiler is increased to provide enough evaporation surfaces, then the evaporation capacity is improved, but constructional difficulties increase
Solution Approach 1:
Instead of increasing height vertically to add evaporation surface area, the invention introduces vertical indentations that create additional evaporation surfaces within the existing height constraint. This dimensional reorganization allows the evaporation surfaces to be arranged in multiple levels and zones without requiring excessive vertical space, thereby maintaining evaporation capacity while reducing constructional complexity.
3Area of stationary object
If the width of the boiler bottom is increased to accommodate more evaporation surfaces, then the evaporation area is improved, but arranging homogeneous feed of fuel and secondary air becomes difficult
Solution Approach 1:
The wide boiler bottom is segmented into multiple zones by vertical indentations, creating separate feed zones that can be independently managed. This segmentation allows fuel and secondary air to be fed homogeneously in each zone while the overall system achieves large evaporation area through the combined capacity of all zones.
Solution Approach 2:
Each zone created by the indentations is optimized for homogeneous feed arrangement with appropriate local geometry and flow patterns. The local quality of each zone ensures proper mixing and distribution of fuel and air, while the cumulative effect of all zones provides the large total evaporation area required for high capacity operation.
4Quantity of substance
If side walls are made thinner relative to their height to reduce material usage, then resource consumption is reduced, but structural rigidity deteriorates
Solution Approach 1:
The vertical indentations introduce curved and angled surfaces in the side walls, replacing purely linear thin-walled structures. These curved geometries provide inherent structural stiffening effects that increase rigidity without requiring additional material thickness, allowing thin-walled construction to maintain adequate structural strength.
Solution Approach 2:
The side walls are segmented by the vertical indentations into multiple rigid sections. This segmentation creates a framed structure where the indentations act as structural ribs that enhance overall rigidity. The segmented design allows thin walls between the rigid sections to suffice, reducing material usage while maintaining structural integrity.
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 design enhances the structural rigidity and heat transfer efficiency of the reactor, facilitating the operation of large, high-efficiency once-through fluidized bed boilers by maintaining uniform fluidized bed behavior and improving the evaporation process across the furnace.
Implementation Method 1
at least one side wall of the reaction chamber forms at least one vertical indentation in the reaction chamber, which indentation extends from the plane of the side wall towards the reaction chamber... said portion of the side wall comprises at least two vertical indenting wall portions deviating from the plane of the side wall
Implementation Method 2
solid material and bed material containing, for example, fuel are fluidized by means of fluidizing gas introduced through the bottom... energy being released in the chemical reactions of the fuel is used for evaporating water flowing in the tubes
Implementation Method 3
energy being released in the chemical reactions of the fuel is used for evaporating water flowing in the tubes... Often there are also superheating surfaces arranged in the fluidized bed reactor for further increasing the energy content of the steam
Implementation Method 4
solid material and bed material containing, for example, fuel are fluidized by means of fluidizing gas introduced through the bottom
Implementation Method 5
energy being released in the chemical reactions of the fuel... when a combustion process is performed in the reactor
Data Source
AI summary
The present invention relates to a fluidized bed reactor (10), comprising a bottom portion (12), a roof portion (16) and side walls (14) vertically extending between the bottom portion and the roof portion, forming a reaction chamber (20) of the fluidized bed reactor, and a solids separator (18) in connection with the reaction chamber. At least one side wall (30.1) of the reaction chamber forms at least one indentation (34) in the reaction chamber (20), which indentation is substantially vertical and extends from the plane (32) of the side wall towards the reaction chamber.