Inwardly Dished Gables for Biomass Reactor Vessels
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Solution Overview
Problem
Large pressurized reactor vessels for biomass prehydrolysis face challenges with shaft deflection and reduced effective internal volume due to larger shaft diameters needed for high pressure, leading to weight and yield loss issues.
Innovation Solution
The design incorporates inwardly dished gables, allowing for a thinner and lighter reactor vessel with a shorter, smaller-diameter material transporting screw, increasing the effective internal volume and reducing production costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the shaft diameter is made larger to avoid deflection in long reactors, then the shaft strength and stability are improved, but the effective internal volume of the vessel is decreased
Solution Approach 1:
The gables are designed with an inward dish (curved surface) instead of being flat. This curvature allows the gables to withstand internal pressure more efficiently, enabling them to be thinner while maintaining structural integrity. Consequently, the shaft can be shorter and have a smaller diameter, thereby increasing the effective internal volume of the reactor vessel.
2Weight of stationary object
If the gables are made thinner to reduce weight, then the reactor vessel weight is decreased, but the pressure resistance is reduced
Solution Approach 1:
The inward dish on the gables creates a curved surface that distributes and resists internal pressure more effectively than a flat surface. This allows the gables to be made much thinner (e.g., 25 mm instead of 200 mm) while maintaining adequate pressure resistance, thereby significantly reducing the overall weight of the reactor vessel.
3Volume of stationary object
If the shaft is made shorter with inwardly dished gables, then the shaft deflection is reduced and effective internal volume is increased, but the gable complexity increases
Solution Approach 1:
While the inward dish does add some structural complexity to the gables, this complexity is localized and standard in pressure vessel design. The benefit of achieving a shorter shaft with smaller diameter (increasing effective internal volume) and reducing shaft deflection outweighs the moderate increase in gable complexity. The curved surface is a well-established solution for pressure containment.
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 design enhances the handling and transportation of reactor vessels while maintaining effective internal volume and process efficiency, reducing weight and production costs.
Implementation Method 1
a dished gable resists the pressure from the pressurized reactor vessel much better
Implementation Method 2
a material transporting screw comprising a central shaft provided within the vessel internal compartment extending between the two gables along a central axis (A) of the reactor vessel, wherein said material transporting screw further comprises screw flight provided around the shaft
Data Source
AI summary
A reactor vessel (1) for biomass material, wherein said reactor vessel (1) is a pressurized reactor vessel, said reactor vessel being elongated and comprising: a substantially tubular vessel part (3); two gables (5a, 5b) connected one to each end (19a, 19b) of the tubular vessel part (3), hereby enclosing a vessel internal compartment (7); and a material transporting screw (8) comprising a central shaft (9) provided within the vessel internal compartment (7) extending between the two gables (5a, 5b) along a central axis (A) of the reactor vessel (1), wherein said material transporting screw further comprises screw flight (11) provided around the shaft (9), wherein said material transporting screw is configured for transporting the biomass material through the reactor vessel, wherein both gables (5a, 5b) are inwardly dished.