Electrolytic Reactor Antechamber Internals for Uniform Phosphate Recovery
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Solution Overview
Problem
Electrolytic reactors face challenges in maintaining constant flow and uniform reaction conditions, leading to inconsistent phosphate recovery and crystal growth, which complicates subsequent separation processes.
Innovation Solution
Incorporating an antechamber with bulkhead internals to divide and deflect the feed flow, ensuring uniform flow velocity and dwell time across the reactor, and using a post-chamber for uniform outflow, along with movable sacrificial electrodes to maintain a constant electric field and prevent clogging, while allowing for polarity reversal to prevent deposits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the feed flow is divided into partial flows using internals in an antechamber, then uniform flow velocity and dwell time are achieved across the reactor, but the device complexity increases
Solution Approach 1:
The reactor is divided into distinct functional zones: an antechamber for flow distribution, a reaction chamber for electrochemical reactions, and a post-chamber for flow collection. Internals in the antechamber further segment the feed flow into multiple partial flows that recombine uniformly in the reaction chamber, ensuring even velocity distribution across the electrode surfaces.
Solution Approach 2:
The antechamber acts as an intermediary zone between the feed inlet and the reaction chamber. It contains internals that mediate the flow distribution, transforming the incoming feed flow into uniformly distributed partial flows before they enter the reaction chamber, thereby eliminating flow non-uniformities without requiring complex modifications to the reaction chamber itself.
2Manufacturing precision
If the reaction chamber has a much wider than high cross-section to distribute flow, then uniform reaction occurs across electrodes, but the reactor length-to-height ratio becomes extremely large
Solution Approach 1:
The reactor volume is segmented into three distinct chambers with specific functional assignments. The antechamber and post-chamber handle flow distribution and collection, while the reaction chamber maintains optimized dimensions for electrochemical reactions. This segmentation allows the reaction chamber to have a moderate aspect ratio while still achieving uniform flow distribution through the antechamber internals.
Solution Approach 2:
The flow distribution problem is solved by adding the antechamber dimension before the reaction chamber. Instead of making the reaction chamber itself extremely wide, the design introduces a preliminary chamber where flow distribution occurs in a different spatial configuration, allowing the reaction chamber to maintain practical dimensions while still achieving uniform flow across electrodes.
3Quantity of substance
If sacrificial electrodes are used for phosphate recovery, then phosphate salts are recovered from liquid, but the electrodes are consumed during operation
Solution Approach 1:
The reactor employs sacrificial electrodes made of inexpensive, readily replaceable materials such as magnesium or aluminum. These electrodes are intentionally designed to be consumable, undergoing controlled corrosion during operation to drive the electrochemical phosphate recovery process. Their short service life is acceptable given their low cost and the simplicity of replacement.
Solution Approach 2:
The sacrificial electrodes are discarded after consuming their material during operation, but their consumption is precisely what enables phosphate recovery. The electrode material is sacrificed to create the necessary electrochemical potential difference, and the recovered phosphate salts are the valuable product. The system is designed to periodically replace consumed electrodes rather than attempt to preserve them.
4Productivity
If flow is kept constant for optimum conversion, then reaction efficiency is maximized, but flow distribution uniformity across the reactor width is difficult to achieve
Solution Approach 1:
The feed flow is segmented into multiple identical partial flows by the internals in the antechamber. Each partial flow follows a similar path and experiences comparable flow conditions. When these partial flows recombine in the reaction chamber, they create a uniformly distributed flow field that maintains constant overall flow rate while ensuring even velocity distribution across the entire reactor width.
Solution Approach 2:
The internals in the antechamber are designed to create locally uniform flow conditions in each partial flow path. By ensuring that each segment of the flow experiences similar velocity and pressure conditions, the overall flow distribution across the reactor width becomes uniform, enabling consistent conversion rates throughout the entire electrode surface area.
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
Achieves consistent phosphate recovery and uniform crystal growth, simplifying separation and processing, with optimized conversion rates and minimal energy consumption by maintaining a constant electric field and flow geometry.
Implementation Method 1
During operation of the reactor, an electrical voltage is applied between the cathode and the anode, so that the anode is consumed (sacrificial anode)
Implementation Method 2
the uniform reaction can enable uniform crystal growth and the resulting distribution of crystal sizes is concentrated in a narrow size spectrum
Data Source
Figure 1
Figure 2
AI summary
The invention relates to an electrolytic reactor (10), in particular for separating phosphate from phosphate-containing liquids and recovering phosphate salts, comprising a housing (12), an inlet (18) and an outlet (20) for the liquid and two electrodes (24, 26) of different polarity enclosing a reaction chamber (28) between them, wherein at least one of the two electrodes (24, 26) is a sacrificial electrode, wherein a pre-chamber (30) is arranged between the inlet (18) and the reaction chamber, in which internals (34) are arranged such that the inlet flow is divided into two partial flows by the internals (34) and directed around the internals (34).