Dry Sorption Booster Venturi Mixing for Exhaust Gas Cleaning
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Solution Overview
Problem
Existing gas cleaning systems for aluminum electrolysis face inefficiencies in sorption rates, erosion, fouling, uneven gas flow distribution, and high emission levels due to inadequate mixing and retention times, leading to increased reactor size and costs.
Innovation Solution
A system utilizing a velocity increasing device with venturis to create a turbulent zone for enhanced mixing of sorbent and exhaust gas, combined with a sorbent distributor and cooling system to improve sorption efficiency and reduce emissions, featuring a booster that balances gas flow and minimizes sorbent fall-out.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a conventional gas cleaning system is used without a velocity increasing device, then the system structure is simpler, but the sorption rate is insufficient and gas flow distribution is uneven
Solution Approach 1:
The reactor is divided into multiple zones with different flow characteristics. The velocity increasing device creates a turbulent zone for enhanced sorption, while other zones maintain different flow patterns to optimize various functions, allowing the system to achieve high sorption rates without requiring the entire system to be complex
Solution Approach 2:
The velocity increasing device acts as an intermediary component that transforms the gas flow from a conventional pattern to a turbulent pattern, enabling enhanced sorption without requiring complete system redesign. This mediator device provides the necessary flow transformation locally
2Productivity
If the gas flow velocity is increased to enhance mixing, then the sorption efficiency improves, but erosion and fouling of the system increases
Solution Approach 1:
High velocity turbulent flow is applied locally only in the sorption zone where enhanced mixing is needed, while other parts of the system maintain lower velocities to minimize erosion and fouling. The velocity increasing device is positioned strategically to create turbulence only where required for sorption
Solution Approach 2:
The system design anticipates erosion and fouling issues by using recirculation to maintain gentle flow conditions in most areas, cushioning against the harmful effects of high-velocity erosion while still achieving high sorption efficiency in the designated turbulent zone
3Productivity
If the reactor size is increased to improve gas flow distribution and retention time, then the sorption performance improves, but the system cost and space requirement increase
Solution Approach 1:
Instead of increasing reactor volume, the system uses dynamic flow control through recirculation to enhance retention time and gas flow distribution. The recirculation mechanism dynamically adjusts flow patterns to optimize sorption performance within the existing reactor volume, avoiding the need for larger equipment
Solution Approach 2:
The system changes the flow velocity parameter locally using the velocity increasing device to create turbulent conditions that enhance mass transfer and sorption rates. This parameter change allows high sorption performance to be achieved in a compact reactor volume rather than requiring large volume with low velocity flow
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
The system achieves improved sorption rates, reduces erosion and fouling, and decreases pollutant emissions by enhancing gas distribution and temperature control, allowing for efficient recovery of valuable fluorides and heat.
Implementation Method 1
a velocity increasing device which is arranged downstream of the gas inlet and is configured to increase a velocity of the exhaust gas and create a turbulent zone
Implementation Method 2
The velocity increasing device is a booster and comprises a plurality of venturis
Implementation Method 3
the gaseous fluoride is adsorbed on to the alumina
Data Source
AI summary
The present invention relates to a system (100) for dry sorption. The system comprises a gas inlet (130) through which exhaust gas from processing industry is flowing into the system (100), a velocity increasing device which is arranged downstream of the gas inlet (130), and a reaction chamber (140) is arranged downstream of the velocity increasing device. The exhaust gas is brought into contact with the sorbent from a sorbent distributor (150) in the reaction chamber (140), wherein the velocity increasing device is a booster (110) and comprises a plurality of resistances to the flow of gas for creation of a turbulent flow of exhaust gas at the outlet of the booster for enhanced sorption. Further, the present invention0relates to a method for cleaning exhaust gas from processing industry utilizing the system (100) for dry sorption.