Micro-Interface Unit for Wet Oxidation Reactor
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Solution Overview
Problem
The papermaking industry faces challenges in wastewater treatment due to high energy consumption and low reaction efficiency in wet oxidation processes, primarily because of short residence time, insufficient mass transfer, and large gas bubbles, leading to excessive reaction time and energy costs.
Innovation Solution
A built-in micro-interface papermaking wastewater treatment system is introduced, featuring a micro-interface unit within the wet oxidation reactor that breaks gas bubbles into micron-scale bubbles, increasing the interfacial area and residence time, reducing the need for high temperatures and pressures, and incorporating pneumatic and hydraulic micro-interface generators to enhance mass transfer efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If traditional wet oxidation method is used with large gas bubbles, then the reactor structure is simple, but the interfacial area of gas-liquid phase is small and mass transfer space is insufficient
Solution Approach 1:
The patent applies segmentation by dividing large gas bubbles into numerous small micro-bubbles (10-100 micrometers) through a micro-interface generator. This segmentation dramatically increases the total interfacial area between gas and liquid phases, solving the mass transfer limitation while maintaining a relatively simple reactor structure. The micro-bubbles are generated by introducing gas through a specialized device that creates fine dispersion without requiring complex reactor modifications.
2Duration of action of moving object
If traditional wet oxidation is used with insufficient mass transfer time, then the reactor design is simple, but the residence time of air or oxygen in liquid phase is short
Solution Approach 1:
The patent applies preliminary action by pre-generating micro-bubbles before they enter the main reaction zone. The micro-interface generator creates fine gas dispersion in advance, ensuring that when gas contacts the liquid phase, maximum interfacial area is immediately available for mass transfer. This preliminary preparation of gas structure extends the effective residence time and improves oxygen transfer efficiency throughout the reaction process.
3Productivity
If high temperature and high pressure are used to compensate for long reaction time, then the reaction can proceed, but energy consumption increases and safety hazards arise
Solution Approach 1:
The patent applies parameter changes by fundamentally altering the gas phase characteristics from large bubbles to micro-bubbles. This parameter change in bubble size (from millimeter scale to 10-100 micrometer scale) dramatically increases the surface area to volume ratio, enhancing mass transfer coefficients. As a result, the oxidation reaction achieves high efficiency at lower temperatures and pressures, reducing energy consumption and eliminating safety hazards associated with high-pressure operation.
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 system improves reaction efficiency, reduces energy consumption, and lowers operational costs by allowing the process to operate at milder conditions, achieving better treatment effects while minimizing safety hazards and energy expenditure.
Implementation Method 1
a micro-interface unit for dispersing and crushing gas into gas bubbles is disposed inside the wet oxidation reactor
Implementation Method 2
improving mass transfer effect between two phases... increasing an interfacial area of the gas-liquid phase, enabling mass transfer space to be fully satisfied
Implementation Method 3
a heat exchanger... the first outlet is connected to a bottom of the wet oxidation reactor through the preheater
Implementation Method 4
wet oxidation technology is more successful in treating papermaking wastewater... The chemical components contained in papermaking wastewater are relatively complex, and the temperature of the wastewater is relatively high
Data Source
AI summary
A built-in micro-interface papermaking wastewater treatment system and a treatment method are provided in the present invention. The treatment system includes a papermaking wastewater tank, a grid cleaner, an adjustment tank, a centrifugal filter and a sedimentation tank which are connected in sequence, and further includes a heat exchanger, a preheater, a wet oxidation reactor, a gas-liquid separator and a biodegradation tank. A micro-interface unit for dispersing and crushing gas into gas bubbles is disposed inside the wet oxidation reactor. The micro-interface unit includes a pneumatic micro-interface generator, a gas inlet is disposed at a side wall of the wet oxidation reactor, and the gas inlet extends to an interior of the pneumatic micro-interface generator through a pipeline. By arranging the micro-interface unit inside the wet oxidation reactor of the treatment system, the consumption of air or oxygen can be reduced, which realizes low energy consumption and high treatment efficiency.