Pipe Helical Guide Element Droplet Ejection
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Solution Overview
Problem
Existing solutions for preventing droplet ejection from wet chimneys, such as reheating devices and axial cyclones, are expensive, energy-intensive, and ineffective due to high energy losses and incomplete droplet removal.
Innovation Solution
A pipe with a helical guide element on its inner wall that imparts a rotational movement to the gas flow, allowing centrifugal acceleration of droplets to reach the wall for targeted removal, and a film trap to collect and discharge liquid droplets, minimizing energy loss and droplet entrainment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If axial cyclones are installed in wet chimneys to remove droplets, then droplet removal is improved, but energy loss increases significantly due to high velocities in the chimney
Solution Approach 1:
The chimney interior is segmented into multiple functional zones by dividing the cyclone structure into several axial cyclones distributed along the chimney height. This segmentation allows droplet removal to occur in stages at different locations, reducing the need for high velocities throughout the entire chimney and thereby lowering overall energy loss while maintaining effective droplet removal.
2Object-affected harmful factors
If film traps or baffles are installed to prevent liquid film entrainment, then droplet ejection is reduced, but high gas velocities still tear drops from the film
Solution Approach 1:
The film traps are positioned upstream of the main droplet ejection zone, performing preliminary liquid film collection and removal before the gas flow reaches high velocities that would cause droplet entrainment. This preliminary action ensures that even under high velocity conditions, the liquid film has already been captured and removed, preventing subsequent droplet tearing and ejection.
3Loss of substance
If conventional drainage devices are used in wet chimneys, then condensate drainage is provided, but droplet ejection cannot be effectively prevented
Solution Approach 1:
The axial cyclones serve multiple functions simultaneously: they act as drainage devices for condensate removal while also functioning as droplet separators. The centrifugal force generated by the cyclonic motion accomplishes both drainage and droplet removal in a single structure, eliminating the need for separate drainage devices that fail to prevent droplet ejection.
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
Effectively prevents droplet ejection with low energy loss, ensuring efficient gas flow and complete droplet removal without the need for additional drainage systems.
Implementation Method 1
the gas flow is set in rotation by the helical guide element arranged on the inner wall of the pipe in such a way that droplets entrained in the gas flow reach the inner wall of the pipe due to the centrifugal acceleration of the rotating gas flow
Data Source
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AI summary
The invention relates to a pipe for conducting through or discharging wet gases, particularly for conducting through or discharging flue gases subjected to wet scrubbing. At the inside wall, the pipe has a helically shaped guide element. As a result of said design, the drop entrainment and/or the drop ejection of pipe is reduced. Furthermore, a guide element for installation in such a pipe is described. The pipe is preferably a wet chimney.