Rotating Packed Bed Structure for Ozone Residence and Mass Transfer
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Solution Overview
Problem
The existing high-gravity devices for ozone catalytic oxidation in wastewater treatment face issues of high energy consumption, short ozone residence time, and low utilization rate due to gas flow difficulties and limited mass transfer at the gas-liquid interface.
Innovation Solution
A rotating packed bed with a novel structure featuring a housing, tubular liquid distributor, annular packing support frame with baffles, and a linkage mechanism, which enhances gas flow and mixing through centrifugal force and turbulence, improving ozone utilization and reducing energy consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high-gravity device is used to strengthen gas-liquid mass transfer, then gas-liquid contact is improved, but energy consumption increases
Solution Approach 1:
The packing support frame is designed to rotate dynamically within the reaction chamber, creating variable centrifugal forces that enhance gas-liquid mass transfer. The rotation mechanism transforms static high-gravity contact into dynamic multi-angle contact, improving transfer efficiency while reducing the overall energy input required compared to continuous high-speed rotation systems
Solution Approach 2:
The packing support frame performs periodic rotation cycles, alternating between rotation and stationary positions. This periodic action creates intermittent high-gravity zones that periodically renew gas-liquid contact interfaces, maintaining high mass transfer efficiency while allowing energy recovery during stationary phases, thus reducing average energy consumption
2Productivity
If high-speed rotation is used to increase turbulence, then gas-liquid mixing is improved, but ozone residence time decreases
Solution Approach 1:
The system implements periodic rotation where the packing support frame alternates between high-speed rotation phases (for intense mixing) and stationary phases (for extended residence time). This cyclical pattern ensures that ozone receives sufficient mixing energy while also maintaining adequate contact time with the liquid phase, resolving the trade-off between mixing efficiency and residence time
Solution Approach 2:
The gas inlet is positioned to introduce ozone before the high-speed rotation phase begins. This preliminary action allows ozone to enter the system and be gradually mixed during the acceleration phase, rather than being introduced during peak rotation when residence time is最短, thereby extending effective contact time while maintaining mixing efficiency
3Ease of operation
If gas inlet is positioned at bottom, then gas flow distribution is improved, but gas flow resistance increases
Solution Approach 1:
The packing support frame's rotation dynamically redistributes the packed material, creating varying flow paths for the gas. This dynamic rearrangement prevents gas from following the same high-resistance path continuously, effectively reducing overall flow resistance while maintaining good distribution. The rotation transforms a static high-resistance configuration into a dynamically optimized flow pattern
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 novel structure increases ozone residence time by 20% and enhances gas-liquid contact, leading to improved ozone utilization and efficient organic wastewater treatment, meeting discharge standards with reduced energy consumption.
Implementation Method 1
A rotating packed bed with a novel structure includes a housing. A driving mechanism is arranged on an upper end surface of the housing... one end of each of the multiple driven mechanisms is fixedly connected to an annular packing support frame... a heterogeneous catalyst is arranged in the annular packing support frame
Implementation Method 2
The novel structure increases ozone residence time by 20% and enhances gas-liquid contact, leading to improved ozone utilization
Data Source
AI summary
Provided is a rotating packed bed with a novel structure. The rotating packed bed includes a housing, a driving mechanism arranged on an upper end surface of the housing, a gas inlet formed in an outer surface of the housing, a gas outlet and a liquid outlet formed in upper and lower end surfaces of the housing, respectively, and a tubular liquid distributor arranged at a center of the housing. A small centrifugal force is applied to the gas in the bed, such that the gas continues to flow in an axial direction. By arranging baffles along an axial direction, ozone can flow in an S-shaped manner in the bed, which makes a flow mode of the gas in the rotor changed.