Rapid Stirrer Speed Control for Stable Flocculation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing methods for controlling the rapid stirrer in flocculating-mixing tanks are insufficient in ensuring proper dispersion of flocculants and formation of flocculated flocs due to fluctuations in sludge and flocculant amounts, leading to inefficient dewatering and thickening processes.
Innovation Solution
A method to control the rotation speed of the stirring blade in a rapid stirrer based on fluctuations in sludge and flocculant amounts, increasing speed with increased sludge or flocculant and reducing speed with decreased amounts, to maintain stable flocculation and fixed floc diameter.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the rotation speed of the flocculant stirrer is controlled only by adjusting the addition ratio of flocculant, then the flocculant supply can be optimized, but the rapid stir performance and flocculant dispersion cannot be sufficiently improved
Solution Approach 1:
The patent applies dynamics by making the rapid stirrer's rotation speed adjustable and variable based on sludge amount detection. The system transitions from a fixed-speed stirrer to one that dynamically adapts its rotation speed (N1) according to real-time sludge conditions, allowing optimal dispersion of flocculant regardless of sludge quantity fluctuations. This dynamic control ensures reliable dewatering capability while maintaining a relatively simple control structure.
2Productivity
If the amount of charged sludge increases, then the treatment throughput increases, but the residence time of sludge in the flocculating-mixing tank decreases
Solution Approach 1:
The system dynamically adjusts the rapid stirrer's rotation speed based on the amount of charged sludge. When sludge amount increases and residence time decreases, the stirrer rotates faster to ensure complete dispersion of flocculant within the shortened停留 time. This dynamic adaptation maintains effective flocculation across varying throughput conditions without requiring extended tank residence time.
Solution Approach 2:
The patent changes the operational parameter (rotation speed of rapid stirrer) in response to changes in sludge amount. By detecting sludge quantity and adjusting the stirrer speed accordingly, the system compensates for reduced residence time when throughput increases, ensuring consistent flocculation quality across different operating conditions.
3Reliability
If the rotation speed of the rapid stirrer is increased to improve flocculant dispersion, then the dispersion efficiency improves, but the energy consumption increases
Solution Approach 1:
The system optimizes the rotation speed parameter of the rapid stirrer based on actual sludge amount and flocculant addition conditions. Rather than operating at constant high speed, the stirrer rotates at the minimum necessary speed to achieve adequate dispersion, adjusting upward only when sludge amount or flocculant concentration requires enhanced mixing. This parameter optimization reduces energy consumption while maintaining reliable dispersion performance.
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 approach ensures consistent formation of fine flocs with proper dispersion, enhancing the stability of dewatering and thickening processes by adjusting the stirring blade's rotation speed according to changes in sludge and flocculant flow rates.
Implementation Method 1
a flocculant is dispersed in water to be treated to form flocculated floc forming nucleus
Implementation Method 2
solids in the water to be treated are flocculated around the flocculated floc forming nucleus to form fine floc
Implementation Method 3
a rapid stirrer stirring sludge and a flocculant in a tank with a stirring blade
Data Source
AI summary
In a rapid stirrer that stirs sludge and a flocculant in a tank with a stirring blade, the rotation speed of the stirring blade is increased at a set rate with an increase in the amount of charged sludge, the rotation speed of the stirring blade is reduced at the set rate with a decrease in the amount of charged sludge, and flocculated flocs having a fixed floc diameter are stably generated even when operating conditions change so as to fluctuate the amount of charged sludge.