Coke Oven Offtake Piping Flow Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional coke oven offtake piping systems lack effective flow control capabilities, particularly during the distillation process, leading to inadequate pressure regulation and potential overpressure or negative pressures, which can result in emissions and inefficiencies.
Innovation Solution
A coke oven offtake piping system with an integrated flow control mechanism featuring an axially moveable obturating member and throttling openings, controlled by pressure sensors and actuators, which progressively constricts the flow orifice to manage gas flow rates and pressure variations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stress or pressure
If conventional offtake piping systems are used without integrated flow control, then the system structure is simple, but pressure regulation is inadequate leading to overpressure or negative pressures
Solution Approach 1:
The flow control valve is integrated directly into the offtake piping system by incorporating the obturating member within the gooseneck structure. This merging of the piping and flow control functions eliminates the need for separate external valve assemblies, thereby improving pressure regulation while minimizing additional structural complexity.
Solution Approach 2:
The gooseneck structure serves multiple functions: it provides the necessary piping curvature for gas flow and simultaneously houses the flow control valve mechanism. This multi-functionality allows the system to achieve pressure regulation capability without adding separate dedicated components, resolving the contradiction between improved pressure control and system simplicity.
2Productivity
If throttling valves are added to control gas flow, then pressure control improves, but device complexity increases
Solution Approach 1:
The obturating member is integrated within the gooseneck structure rather than being a separate external valve. This combination allows gas flow control to be achieved while minimizing the addition of complex external valve mechanisms, as the control element becomes part of the existing piping architecture.
Solution Approach 2:
The obturating member is designed to be axially movable between open and closed positions, providing dynamic flow control capability. This dynamic adjustment allows progressive constriction of the flow orifice to manage gas flow rates precisely, improving productivity while the integrated design keeps the mechanical complexity manageable.
3Manufacturing precision
If axially moveable obturating member is used, then flow control precision improves, but manufacturing complexity increases
Solution Approach 1:
The axially moveable obturating member provides precise flow control by allowing progressive adjustment of the flow orifice area. The linear axial movement mechanism is simpler to manufacture than rotational valves or complex positioning systems, as it requires only guided linear motion and axial actuation forces.
Solution Approach 2:
The flow control function is segmented into the obturating member and flow orifice components within the gooseneck. This segmentation allows the precision flow control to be achieved through the relative positioning of simple geometric shapes (the obturating member and orifice opening) rather than requiring complex machined surfaces or tight tolerances throughout the entire assembly.
Data Source
Figure 1~2
Figure 3~4
Figure 5
AI summary
A coke oven piping system (10) comprises a pipe assembly for conveying coke oven gases (14) from a coke oven to a collecting main (16); and flow control means comprising a flow orifice (22) in the pipe assembly with an associated obturating member (20), the obturating member being axially moveable between an open position at a certain distance from the flow orifice to a closed position in which it substantially obstructs the flow orifice (22). At least one throttling opening (28) is arranged so as to offer, towards the end of the closing stroke of the obturating member (20), an opening area for the gases to the collecting main (16) that depends on the axial position of the obturating member (20).