Scrubber Inner Shield Reduces Liquid Entrainment
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Solution Overview
Problem
Existing scrubbers face challenges with high exhaust gas velocity causing entrainment of scrubbing liquid, leading to increased back pressure, reduced drainage capabilities, and potential sulfur release in downstream sections.
Innovation Solution
The scrubber incorporates an inner shield extending between the casing and the deflector device, creating a gap for downward scrubbing liquid flow, which reduces entrainment by shielding the liquid from high gas velocities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the exhaust gas flow area is limited to minimize scrubber footprint, then the gas velocity increases, but the scrubbing liquid drainage capability decreases and entrainment increases
Solution Approach 1:
The scrubbing chamber is divided into multiple sections (first scrubbing section and second scrubbing section) with separate deflector devices and drainage paths. This segmentation allows independent optimization of each section's flow characteristics and drainage capability, resolving the contradiction between compact footprint and effective liquid drainage.
Solution Approach 2:
A second deflector device is introduced as an intermediary element in the second scrubbing section to control gas flow direction and create favorable flow patterns for liquid drainage. This intermediary structure enables effective drainage without requiring increased flow area, thus maintaining compact footprint while improving drainage capability.
2Speed
If the gas velocity is high to maintain flow efficiency, then the scrubbing process is effective, but the scrubbing liquid is entrained to higher levels causing increased back pressure
Solution Approach 1:
Different deflector devices are provided in different scrubbing sections with specific local configurations. The first deflector device has a first configuration optimized for its section, and the second deflector device has a second configuration optimized for the second section. This local quality approach allows high gas velocity to be maintained overall while creating localized flow patterns that prevent liquid entrainment in each section.
Solution Approach 2:
Instead of trying to reduce gas velocity to prevent liquid entrainment, the invention inverts the approach by using deflector devices to redirect the high-velocity gas flow in a controlled manner. The deflectors create turbulence and change flow direction to favor liquid drainage while maintaining the overall high gas velocity needed for effective scrubbing.
3Area of stationary object
If the scrubbing liquid flow area is reduced to match the limited exhaust gas flow area, then the scrubber remains compact, but the liquid drainage capability is significantly reduced
Solution Approach 1:
The scrubbing chamber is segmented into multiple sections with separate liquid drainage paths for each section. This segmentation allows the liquid flow area to be distributed across multiple smaller channels rather than requiring a single large drainage area, maintaining compact overall dimensions while providing adequate liquid drainage capability through multiple parallel paths.
Solution Approach 2:
The liquid drainage is facilitated by utilizing the vertical dimension and flow direction changes created by the deflector devices. The deflectors create flow patterns that guide liquid downward through the scrubbing sections, allowing liquid drainage to occur effectively without requiring additional horizontal flow area, thus maintaining compact footprint while improving drainage capability.
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 configuration effectively reduces scrubbing liquid entrainment, minimizes back pressure, enhances drainage capabilities, and decreases the risk of sulfur release, thereby improving overall scrubber performance.
Implementation Method 1
the high exhaust gas velocity makes it difficult to drain the scrubbing liquid in the scrubber since the scrubbing liquid typically should pass the same area in the opposite direction, i.e. through the exhaust gas flow, to be drained. The effect may cause entrainment of scrubbing liquid to a higher level in the scrubber
Implementation Method 2
The inner shield forms a gap with the casing, which gap has an inlet end and an outlet end to permit a downwards flow of scrubbing liquid through the gap, past the inner shield, along the casing
Implementation Method 3
a spraying nozzle arranged between the gas outlet of the casing and the deflector device and configured to spray a scrubbing liquid into the scrubbing chamber and the gas flow
Data Source
AI summary
A scrubber for cleaning of a gas comprises a casing enclosing a scrubbing chamber. The casing comprises a gas inlet into and a gas outlet out from the scrubbing chamber. A gas flow of the gas flows through the scrubbing chamber in a flow direction from the gas inlet to the gas outlet. A deflector device is provided in the scrubbing chamber between the gas inlet and the gas outlet and forms a passage between the deflector device and the casing. A spraying nozzle is arranged between the gas outlet and the deflector device for spraying a scrubbing liquid into the scrubbing chamber and the gas flow. An inner shield extends between the casing and the deflector device, surrounds the deflector device at least partly, and forms a gap with the casing. Scrubbing liquid may flow through the gap.