Inclined Bed Reactor for High Space Velocity Reforming
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Solution Overview
Problem
Current radial bed reactor technologies are limited by high catalyst volume requirements and low space velocity (HSV) due to constraints on gas flow velocity, catalyst pinning, and pressure drops, resulting in maximum HSVs of around 20 h−1, which hampers efficient catalytic reforming processes.
Innovation Solution
The development of an inclined bed reactor with gravitational catalyst flow and transverse feed flow, utilizing conical walls and a catalyst distribution zone, allows for a smaller catalyst quantity and higher space velocities (HSV > 50 h−1) by controlling the angle of catalyst flow and maintaining uniform catalyst distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If radial bed reactor technology is used with horizontal gas flow and vertical catalyst movement, then catalyst distribution can be maintained, but gas flow velocity is limited due to catalyst pinning and cavitation constraints
Solution Approach 1:
The patent changes the flow configuration from horizontal gas flow (radial bed) to vertical gas flow (upward or downward) through the catalyst bed. This dimensional change in flow direction eliminates the catalyst pinning problem against the inner grid that occurs in radial bed reactors, allowing higher gas flow velocities without operational constraints.
Solution Approach 2:
The patent inverts the conventional radial bed configuration by reversing the gas flow direction to be vertical rather than horizontal. This inversion of the flow pattern fundamentally changes the hydrodynamics, preventing catalyst particles from being pinned against the reactor walls or inner grid during gas flow.
2Quantity of substance
If radial bed reactor is used with annular reaction zone, then catalyst flow can be maintained, but minimum catalyst volume is required due to space constraints between inner and outer grids
Solution Approach 1:
The patent changes the geometric parameters of the reactor configuration from an annular cross-section (radial bed) to a cylindrical cross-section (vertical bed). This parameter change in the reactor geometry allows for more efficient space utilization, achieving the same catalytic activity with reduced catalyst volume occupying approximately 70-80% of the reactor volume.
Solution Approach 2:
The patent transitions from a two-dimensional annular reaction zone (between inner and outer grids) to a three-dimensional cylindrical reaction zone. This dimensional change eliminates the space constraints imposed by the inner grid, allowing maximum catalyst loading density and reduced overall reactor volume for the same catalyst quantity.
3Productivity
If radial bed reactor operates with limited gas velocity, then pressure drops are reduced, but space velocity (HSV) is limited to around 20 h−1
Solution Approach 1:
The patent changes the flow regime parameter from horizontal to vertical flow, which fundamentally alters the pressure drop characteristics. In vertical flow configuration, the pressure drop becomes a function of gas velocity squared rather than being constrained by catalyst pinning, enabling operation at high gas velocities (superficial velocities of 0.5-2.0 m/s) that achieve HSV > 50 h−1 without excessive pressure drops.
Solution Approach 2:
The patent changes the flow direction from horizontal (radial) to vertical (axial), transforming the pressure drop mechanism. This dimensional change allows the system to operate in a different hydrodynamic regime where pressure drop is better controlled and does not lead to catalyst pinning, enabling high productivity operation.
4Stability of the object's composition
If perforated grid is added to central collector for homogeneous distribution, then pressure drop increases, but device complexity increases
Solution Approach 1:
The patent extracts and eliminates the inner grid component from the radial bed configuration. By removing this complex structural element, the need for additional perforated grids for catalyst distribution is eliminated, simplifying the overall device structure while maintaining effective catalyst-gas contact through the vertical flow regime.
Solution Approach 2:
The patent inverts the conventional approach by removing the inner grid rather than adding complexity to it. This inversion of the structural design philosophy leads to a simpler reactor configuration where homogeneous catalyst distribution is achieved through flow dynamics rather than complex grid structures.
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 configuration enables higher space velocities, reduces temperature fluctuations, and improves catalytic activity and aromatics production in gasoline reforming, allowing for efficient treatment of high-paraffinic feeds with reduced catalyst usage.
Implementation Method 1
the catalytic bed in a radial bed reactor is delimited by two grids... the movement of catalyst which is gravitational, i.e. substantially vertical from top to bottom and obtained solely by the effect of the weight of the bed of catalyst
Implementation Method 2
The invention relates to a novel inclined bed reactor technology with gravitational movement of the catalyst... The angle of the bed with respect to the horizontal is greater than the angle of repose of the catalyst (minimum angle ensuring gravitational flow of the particles of catalyst)
Data Source
AI summary
The present invention describes a type of inclined bed reactor which permits a small quantity of catalyst to be employed. Application of the reactor to a regenerative reforming process.