Duct Intersection Flow Modifiers for Coke Oven Pressure Drop
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Solution Overview
Problem
Traditional duct intersection designs in coke oven systems suffer from significant pressure drop losses, poor mixing of air and volatile matter, leading to hot spots, erosion, and structural degradation, limiting the number of coke ovens that can be connected and increasing operational costs.
Innovation Solution
The implementation of contoured duct liners, turning vanes, and transition portions in duct intersections, which are designed to improve gas flow by reshaping the internal contours of the ducts, reducing pressure drop losses, and enhancing mixing, using refractory materials and computational fluid dynamics to optimize flow modifier placement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If traditional duct intersection designs are used, then the system is simpler and easier to manufacture, but pressure drop losses increase and flow distribution deteriorates
Solution Approach 1:
The patent applies curved transition surfaces and contoured duct liners instead of sharp angles in duct intersections. The curved geometry smoothly guides gas flow from one duct to another, eliminating flow separation and reducing pressure drop losses while maintaining structural integrity.
Solution Approach 2:
The duct intersection is divided into multiple sections with gradual transitions. Flow modifiers are placed at specific locations within the intersection to control flow patterns in different zones, allowing optimization of flow distribution without requiring complete redesign of the entire intersection.
2Stability of the object's composition
If traditional duct intersection designs are used, then the design is simpler, but mixing of air and volatile matter deteriorates leading to hot spots
Solution Approach 1:
Curved transition surfaces create rotational flow patterns that enhance mixing of air and volatile matter. The centrifugal effects generated by curved geometries prevent stagnant zones and promote uniform flow distribution, eliminating hot spots without requiring complex active mixing devices.
Solution Approach 2:
Flow modifiers serve as intermediary elements within the duct intersection that actively manage flow patterns. These components facilitate better mixing and flow distribution by creating controlled turbulence and preventing flow separation, acting as mediators between the intersecting duct streams.
3Reliability
If traditional duct intersection designs are used, then the system requires fewer modifications, but erosion and thermal wear increase due to poor flow zones
Solution Approach 1:
The curved duct liners and transition surfaces eliminate sharp corners and stagnant zones where erosion and thermal wear occur. The smooth curved geometry ensures continuous flow that prevents material accumulation and reduces localized stress concentrations, thereby improving structural reliability.
Solution Approach 2:
Flow modifiers are installed in advance within the duct intersection to pre-condition the flow patterns before gases reach critical structural areas. This preliminary flow conditioning prevents erosion and thermal wear by ensuring uniform flow distribution throughout the intersection, protecting structural integrity before damage can occur.
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 solution improves flow distribution, reduces pressure drop losses, and enhances structural integrity, leading to more efficient coke plant operations and potentially lower capital and maintenance costs by minimizing draft requirements and reducing unwanted air infiltration.
Implementation Method 1
improve gas flow by reshaping the internal contours of the ducts, reducing pressure drop losses
Implementation Method 2
enhancing mixing, using refractory materials and computational fluid dynamics to optimize flow modifier placement
Data Source
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AI summary
A duct intersection comprising a first duct portion and a second duct portion extending laterally from a side of the first duct portion. At least one flow modifier is mounted inside one of the first and second duct portions. The flow modifier is a contoured duct liner and/or the flow modifier includes at least one turning vane. The duct intersection may also include a transition portion extending between the first and second duct portions, wherein the transition portion has a length extending along a side of the first duct portion and a depth extending away from the side of the first duct portion, wherein the length is greater than a diameter of the second duct portion.