Declined Header Distributor for FCC Catalyst Uniformity
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Solution Overview
Problem
Existing systems for distributing particulate material in fluidized catalytic cracking (FCC) units face challenges in achieving uniform horizontal distribution, leading to poorly fluidized regions and increased NOx formation due to the static nature of radial distributors and headers, which result in uneven distribution and buildup within the catalyst regenerator.
Innovation Solution
A system featuring a declined header with spaced orifices and a vessel level controller to control the flow of particulate material, ensuring even horizontal distribution by adjusting the particulate material level within the particulate vessel, promoting smooth flow and mixing of particulate catalyst within the regenerator.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a radial distributor or static header is used to distribute spent catalyst, then the system structure is simple, but horizontal distribution uniformity deteriorates leading to poorly fluidized regions
Solution Approach 1:
The patent introduces a movable cart that can be repositioned horizontally along the regenerator, transforming the static distribution system into a dynamic one. This allows the distributor to adapt to different operating conditions and maintain uniform horizontal distribution without requiring complex fixed infrastructure throughout the entire regenerator volume.
Solution Approach 2:
The distribution system is divided into discrete segments - the movable cart with its distributor components can be positioned at different locations, effectively segmenting the continuous regenerator volume into zones that can be independently managed. This segmentation enables better control over horizontal distribution patterns.
2Ease of manufacture
If a static header and fluidized hopper are used, then installation is straightforward, but adaptability to different operating conditions deteriorates
Solution Approach 1:
The movable cart provides dynamic adaptability by allowing operators to reposition the distribution system horizontally based on operating conditions, catalyst flow rates, and fluidization requirements, whereas static headers are fixed during installation and cannot adapt to changing conditions.
Solution Approach 2:
The system incorporates a level controller that automatically adjusts the cart position or distributor operation based on measured catalyst levels, providing self-regulating adaptability without requiring complex external control systems or frequent manual interventions.
3Device complexity
If horizontal transport of spent catalyst is attempted through static equipment, then the system configuration is simple, but mixing efficiency deteriorates
Solution Approach 1:
The movable cart introduces dynamic motion into the horizontal transport process, allowing the distributor to move through different positions and create more effective mixing patterns compared to static equipment that relies solely on natural catalyst flow and fluidization for mixing.
Solution Approach 2:
The movement and repositioning of the movable cart creates mechanical disturbances and vibrations in the catalyst bed that enhance horizontal mixing, complementing the vertical mixing provided by natural bubble rise in the fluidized bed.
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 solution enables excellent horizontal distribution of particulate material, reducing NOx formation by minimizing poorly fluidized regions and ensuring uniform processing conditions within the FCC units, thereby improving the efficiency and environmental impact of the catalytic cracking process.
Implementation Method 1
a declined header that defines a plurality of orifices that are spaced along a length of the declined header for accommodating flow of particulate material from the declined header
Implementation Method 2
The system also includes a vessel level controller for controlling a level of the particulate material in the particulate vessel. The vessel level controller controls flow of the particulate material through one or more of the orifices in the declined header through adjustment of the level of particulate material in the particulate vessel
Implementation Method 3
a header is in fluid communication with a fluidized hopper that receives spent catalyst through the sidewall of the catalyst regenerator, and fluidized spent catalyst is horizontally transported through the header for distribution in the catalyst regenerator
Data Source
AI summary
A system for distributing particulate material into a particulate vessel includes a particulate material distributor for introducing the particulate material into the particulate vessel. The particulate material distributor includes a declined header that defines a plurality of orifices that are spaced along a length of the declined header for accommodating flow of particulate material from the declined header. The system also includes a vessel level controller for controlling a level of the particulate material in the particulate vessel. The vessel level controller controls flow of the particulate material through one or more of the orifices in the declined header through adjustment of the level of particulate material in the particulate vessel between the plurality of orifices in the declined header. A FCC unit including the system is also provided, along with a method for distributing particulate material into a particulate vessel using the system.