Oxidation Basin Flow Distribution via Segmented Baffles
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Solution Overview
Problem
Conventional oxidation tanks for treating discharge water from seawater flue gas scrubbers face inefficiencies due to uneven flow distribution and sulfite concentration differences, leading to a larger space requirement and excessive oxidation air usage.
Innovation Solution
The oxidation tank incorporates a distribution chamber with a larger outlet cross-section and main flow baffles that deflect and mix the incoming seawater flow homogeneously across the tank width, reducing speed disparities and optimizing flow distribution, along with hollow baffles for even mixing of secondary flows, which reduces the need for oxidation air.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If the basin cross-section is increased five times larger than the supply line cross-section to achieve necessary residence time, then the residence time requirement is met, but the flow distribution becomes uneven and the basin length must be increased considerably
Solution Approach 1:
The basin cross-section is segmented into multiple flow channels separated by vertical baffles. This divides the single large cross-section into several smaller channels, each receiving a portion of the supply flow. The segmentation ensures uniform flow distribution across the basin width while maintaining the total cross-sectional area needed for adequate residence time, eliminating the need for excessive basin length.
Solution Approach 2:
The vertical baffles create local flow zones with optimized characteristics. Each baffle channel is designed to receive and distribute flow uniformly, creating localized regions of consistent flow velocity and residence time. This local optimization ensures that every portion of the basin cross-section contributes effectively to the overall treatment process without requiring the entire basin to be oversized.
2Duration of action of moving object
If the basin is made very long to compensate for uneven flow distribution, then the residence time is maintained, but the space requirement and device complexity increase
Solution Approach 1:
By segmenting the cross-section with vertical baffles, the invention achieves uniform flow distribution across the width, which eliminates the need for excessive length to compensate for poor distribution. The segmented channels ensure that fluid elements traverse the basin efficiently, achieving required residence time with optimized length.
Solution Approach 2:
Instead of solving the flow distribution problem by increasing length in one dimension, the invention addresses it by modifying the cross-sectional structure in another dimension. The vertical baffles create a two-dimensional flow distribution pattern that optimizes residence time without requiring excessive basin length.
3Quantity of substance
If air is added uniformly from the bottom of the oxidation basin, then the chemical oxygen demand is met, but inhomogeneous flow distribution prevents optimal air distribution and increases oxidizing air requirements
Solution Approach 1:
The vertical baffles segment the air distribution into multiple channels, allowing air to be distributed more uniformly across the basin width. This segmentation ensures that oxygen is delivered efficiently to each flow channel, optimizing the oxidation process and reducing the total air quantity required to meet the chemical oxygen demand.
Solution Approach 2:
The baffle structure creates local zones with optimized air-water contact characteristics. Each channel receives air proportional to its flow rate, creating locally optimal oxidation conditions. This local optimization improves overall air utilization efficiency and reduces waste.
4Device complexity
If the mixed water flow is formed without specific optimization, then the system is simple, but undesirable differences in sulfite concentration occur and flow distribution is uneven
Solution Approach 1:
The vertical baffles segment the mixed water flow into multiple channels, ensuring that sulfite-containing effluent is distributed uniformly across the basin width. This segmentation prevents concentration gradients and ensures consistent treatment conditions throughout the basin without requiring complex mixing mechanisms.
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 design achieves a more efficient use of space, reduces oxidation air requirements, and ensures a homogeneous flow distribution, allowing for a smaller tank size while maintaining the same residence time and desulfurization efficiency.
Implementation Method 1
the distribution chamber receives the main flow with an inflow direction and deflects it in the direction of the longitudinal direction of the oxidation basin
Implementation Method 2
main flow baffles that deflect and mix the incoming seawater flow homogeneously across the tank width, reducing speed disparities
Implementation Method 3
The chemical oxygen demand is met and the degree of oxygen saturation is adjusted by adding air as an oxygen carrier to the oxidation basin
Implementation Method 4
the effluent is mixed with additional seawater for the purpose of sulfate formation and neutralization
Data Source
Figure 1~2
Figure 3
Figure 4a~4d
AI summary
The invention relates to an oxidation basin for treating outlet water from a seawater-flue gas scrubber for removing sulphur dioxide from the flue gas, in particular from a flue gas scrubber of a power plant, in which the outlet water is mixed together with additional seawater for purposes of sulfate formation and neutralization, wherein the additional seawater is conducted as a primary flow via a supply line and outlet water is conducted as a secondary flow via an additional supply line into the oxidation basin, wherein the flow through of the basin is improved in that the oxidation basin has a distributor chamber having an inlet cross-section and a larger outlet cross-section, defined by the width of the oxidation basin, wherein the distributor chamber receives the primary flow having an inflow direction and diverts the primary flow in the direction of the longitudinal direction of the oxidation basin, and wherein a series of primary flow impediments, arranged substantially parallel to the inflow direction of the primary flow and spaced apart over the width of the oxidation basin, is located in the outlet cross-section of the distributor chamber, between which the primary flow escapes from the distributor chamber.