Buffering Device for Wastewater Crystallizer Plugging
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Solution Overview
Problem
Existing wastewater treatment systems face challenges in maintaining uniform crystal size in crystallizers, leading to plugging issues and reduced efficiency due to the formation of large salts, resulting in higher energy consumption and lower treatment efficiency.
Innovation Solution
A wastewater treatment system with a buffering device that includes a primary and secondary buffering system with detection elements for liquid level and concentration, connected to a circulation crystallizer and evaporator, allowing for controlled fluid flow adjustments to manage crystal formation and reduce plugging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the residence time of crystal in the crystallizer is extended to improve crystal uniformity, then crystal size distribution improves, but the risk of plugging increases due to large salt formation
Solution Approach 1:
The crystallizer is divided into multiple zones with different residence times. A first zone provides extended residence time for crystal uniformity, while a second zone provides shorter residence time to prevent plugging. This segmentation allows different regions to serve different functions simultaneously.
Solution Approach 2:
Different regions of the crystallizer are assigned different operational characteristics. The first zone has conditions optimized for crystal uniformity (longer residence time), while the second zone has conditions optimized for preventing plugging (shorter residence time). Each zone has locally optimized quality parameters.
2Productivity
If the crystallizer operates at higher concentration to improve treatment efficiency, then evaporation efficiency improves, but plugging occurs more frequently
Solution Approach 1:
The crystallizer is segmented into zones with different concentration levels. The first zone operates at higher concentration for improved treatment efficiency, while the second zone operates at lower concentration to minimize plugging frequency.
Solution Approach 2:
A buffer device is introduced as an intermediary between the crystallizer and the system outlet. This buffer receives crystallized slurry and allows controlled discharge, mediating between the high-concentration evaporation process and the need to prevent plugging in downstream equipment.
3Reliability
If plugging is prevented by reducing residence time, then plugging frequency decreases, but crystal uniformity deteriorates
Solution Approach 1:
The crystallizer is divided into zones where the first zone provides extended residence time for crystal uniformity, while the second zone provides shorter residence time to maintain system reliability and prevent plugging.
Solution Approach 2:
Different zones have locally optimized residence times. The first zone has longer residence time optimized for crystal uniformity, while the second zone has shorter residence time optimized for system reliability and plugging prevention.
4Productivity
If the crystallizer is designed for high evaporation rate to improve productivity, then treatment efficiency improves, but energy consumption increases
Solution Approach 1:
The system uses partial action by operating the crystallizer at moderate evaporation rates rather than maximum rates. The buffer device allows the system to accumulate crystallized slurry and discharge periodically, avoiding the need for continuous high-energy evaporation while maintaining productivity.
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 reduces the production of large salts, slows down plugging, improves crystal uniformity, and decreases energy consumption by optimizing the operation conditions of the crystallizer, leading to enhanced crystallization efficiency and reduced pipe blockages.
Implementation Method 1
each is provided with a detection element related to the liquid level
Implementation Method 2
the circulation crystallizer is provided with a detection element related to the concentration
Implementation Method 3
circulation crystallizer
Implementation Method 4
evaporator
Data Source
AI summary
Disclosed is a waste water treatment system with a buffering device, the system comprising a waste water pretreatment device, an evaporator, a circulating crystallizer, a crystal filtration device and a water removal device which communicate with each other in sequence, and further comprising a primary buffering device and a secondary buffering device, wherein one end of the primary buffering device is in bi-directional communication with the circulating crystallizer, and the other end thereof is connected to the evaporator; and the secondary buffering device is in bi-directional communication with the circulating crystallizer. Further disclosed is a waste water treatment method for a waste water treatment system with a buffering device.