Center Feed Injection System for Coke Drum Thermal Uniformity
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Solution Overview
Problem
Current dispensing systems for residual byproducts in delayed coking processes lack control over flow patterns, leading to uneven heat distribution, thermal variance, and reduced vessel lifespan due to uncontrolled injection of heated materials, which causes stress and affects coke bed morphology and quench characteristics.
Innovation Solution
A center feed injection system with a retractable nozzle and inlet sleeve that allows for controlled injection of residual byproducts, steam, and quench fluids into a coke drum, featuring adjustable flow characteristics and angles to ensure consistent distribution and reduce thermal cycling stress.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a simple dispensing system is used to inject heated residual byproduct into a coke drum, then the device complexity is reduced, but the heat distribution becomes uneven and thermal variance increases
Solution Approach 1:
The dispensing system is segmented into multiple injection nozzles distributed around the periphery of the coke drum, with each nozzle injecting material at different locations. This segmentation allows heat to be distributed more uniformly throughout the drum, preventing localized thermal variance while maintaining relatively simple individual nozzle components.
Solution Approach 2:
Different injection nozzles are positioned at specific locations around the drum periphery, with each nozzle tailored to inject material at optimal angles and positions for its specific location. This local optimization of injection characteristics ensures uniform heat distribution across different regions of the drum without requiring complete redesign of the entire system.
2Productivity
If heated residual byproduct is injected directly into the coke drum, then the productivity is improved, but thermal cycling stress increases and vessel lifespan is reduced
Solution Approach 1:
The injection nozzles are designed to pre-condition the injected material by controlling its trajectory and distribution pattern before it contacts the coke bed. The nozzles inject material in a manner that promotes gradual heat distribution throughout the drum, preventing sudden thermal shocks that would cause stress cycling and extend vessel lifespan while maintaining processing efficiency.
Solution Approach 2:
The injection nozzles act as intermediary devices between the heated residual byproduct source and the coke drum interior. They control and moderate the introduction of hot material, distributing it gradually and uniformly to reduce thermal stress on the vessel while maintaining the productivity benefits of continuous coking operations.
3Ease of operation
If uncontrolled injection of heated materials is used, then the ease of operation is improved, but coke bed morphology deteriorates and quench characteristics are affected
Solution Approach 1:
The injection system incorporates adjustable nozzle configurations that can be dynamically positioned or angled to optimize injection patterns. This dynamic capability allows the system to maintain consistent coke bed morphology by adapting injection parameters while keeping the overall system easy to operate through automated or semi-automated control mechanisms.
Solution Approach 2:
The injection nozzles are designed with adjustable parameters such as injection angle, position, and flow rate that can be optimized for different operating conditions. These parameter adjustments enable consistent coke bed morphology and quench characteristics without requiring complex operational procedures, as the nozzles can be pre-configured for standard operating modes.
Data Source
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AI summary
The present invention features a center feed system for use within a delayed coking system, or any other similar system. The center feed system features an inlet sleeve which slidably engages a retractable nozzle, with inlet and outlet, in fluid connection with a feed source of residual byproduct, allowing residual byproduct to flow from the feed source into the interior of a vessel, thus effectuating or inducing even thermal distribution throughout the vessel.