Coke Oven Offtake Piping Flow Control
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Solution Overview
Problem
Existing coke oven offtake piping systems lack precise control over raw gas flow rates, leading to issues with oven pressure management and emissions during the distillation process.
Innovation Solution
A coke oven offtake piping system with a movable gate member that varies the opening area of the discharge orifice, utilizing a pivoting mechanism with a concave surface profile and cut-outs for fine flow control, allowing precise adjustment of gas flow rates to the collecting main.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a control valve is provided in the offtake piping to control gas pressure, then oven pressure control is improved, but the device complexity increases
Solution Approach 1:
The invention changes the operating parameters of the valve by utilizing water level variations to control the valve port area. The water level in the valve body changes in response to gas flow rate changes, automatically adjusting the opening area to maintain pressure control without complex mechanical actuation systems
Solution Approach 2:
The valve design allows the water level inside the valve to automatically respond to gas flow rate changes and self-regulate the valve port area. The system uses the inherent hydrostatic pressure and water level changes to control the flow, eliminating the need for external actuators or complex control mechanisms
2Object-generated harmful factors
If a pot valve is used to control flow rate, then emission reduction is improved, but flow rate control precision deteriorates
Solution Approach 1:
The invention transitions from a static valve opening to a dynamic adjustment mechanism where the valve port area changes continuously with water level. This dynamic response allows precise flow rate control that adapts to varying gas flow conditions, improving both emission control and flow precision
Solution Approach 2:
The valve system incorporates implicit feedback through the water level response to gas flow rate changes. The water level automatically adjusts based on the pressure differential and flow conditions, providing continuous feedback that fine-tunes the valve opening area for optimal flow control precision
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
Enables continuous and precise control of oven pressure, reducing emissions and preventing negative pressures, thereby improving safety and efficiency during the distillation process.
Implementation Method 1
One or more spraying nozzles are arranged in the gooseneck to cool (quench) the raw gases from about 700-800°C down to a temperature of about 80-100°C
Data Source
Figure 1
Figure 2~3
Figure 4~7
AI summary
A coke oven offtake piping system comprises a pipe assembly (10) for convey- ing coke oven gases from a coke oven to a collecting main (14); at least one spraying nozzle (18) in said pipe assembly; and a discharge section (19) with a discharge pipe (20) having a discharge orifice (22, 222). A gate member (24; 124a, 124b; 224; 324; 424) cooperates with the discharge orifice (22; 222) and is movable along the discharge orifice in order to present a closing surface to the extremity thereof, whereby the opening area of said discharge orifice can be varied for controlling the flow rate to the collecting main (14).