Coal Water Slurry Concentration Device Segmented Grinding
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Solution Overview
Problem
Current coal water slurry preparation processes face challenges in quickly selecting pulverized coal with suitable particle sizes and achieving stable concentration, leading to inefficient energy use and environmental concerns due to the high energy consumption of wet overflow rod mills.
Innovation Solution
A concentration device comprising a grinding shell with a grinding mechanism, filter unit, and pulverized coal particle size distribution mechanism, which includes step-by-step grinding units, adjusting units, and a stirrer to separate and mix pulverized coal with varying particle sizes, allowing for effective grinding and mixing into a high-concentration coal water slurry.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If wet overflow rod mill is used for grinding and pulping, then labor intensity is reduced and environmental pollution is minimized, but energy consumption increases and particle size stability deteriorates
Solution Approach 1:
The grinding process is segmented into multiple stages with different grinding rollers (coarse grinding roller, medium grinding roller, fine grinding roller) that operate at different locations and with different parameters. This allows each stage to be optimized independently for its specific function, improving overall energy efficiency while maintaining the benefits of wet grinding
Solution Approach 2:
The grinding gap between rollers is made adjustable through hydraulic or mechanical adjustment mechanisms, allowing the system to dynamically adapt grinding parameters to feed concentration changes and particle size requirements, thereby reducing energy consumption while maintaining particle size stability
2Ease of manufacture
If wet overflow rod mill is used for grinding and pulping, then labor intensity is reduced and environmental pollution is minimized, but particle size stability deteriorates
Solution Approach 1:
The grinding process is divided into multiple stages with progressively finer grinding rollers, each targeting specific particle size ranges. This segmented approach ensures stable particle size distribution by systematically reducing particle sizes through controlled stages rather than single-stage random grinding
Solution Approach 2:
The system incorporates feedback mechanisms where particle size analysis results are used to adjust grinding parameters in real-time, ensuring stable particle size output. The adjustable grinding gap and rotational speed control respond to process conditions to maintain consistent particle size distribution
3Stability of the object's composition
If pulverized coal with different particle sizes is mixed, then coal water slurry with stable concentration is formed, but quick selection of suitable particle sizes becomes impossible
Solution Approach 1:
The system performs preliminary classification of pulverized coal into different particle size ranges before mixing, using classified hoppers to separate and store coal of different sizes. This preliminary action enables quick selection of suitable particle sizes without time-consuming on-site sorting, while still achieving stable slurry concentration through controlled mixing of pre-classified fractions
4Productivity
If grinding gap is not uniformly adjusted, then grinding efficiency varies, but grinding mechanism complexity increases
Solution Approach 1:
Multiple grinding gap adjustment functions are merged into a single integrated adjusting mechanism that simultaneously controls the gaps between multiple grinding rollers. This unified mechanism reduces overall system complexity while maintaining the ability to uniformly adjust all grinding gaps for optimized grinding efficiency
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 device enables efficient separation and mixing of pulverized coal with appropriate particle sizes, increasing grinding time and producing a high-concentration coal water slurry, thereby improving energy efficiency and reducing environmental impact.
Implementation Method 1
a grinding mechanism is connected in the grinding shell... a step-by-step grinding unit... two first grinding rollers and two second grinding rollers
Implementation Method 2
A lower part of the grinding shell is connected to a filter unit, where the filter unit is correspondingly arranged with a discharge port of the grinding mechanism
Implementation Method 3
the stirrer is used for stirring the pulverized coal with different particle sizes into the coal water slurry
Data Source
AI summary
Provided is a concentration device for coal water slurry, belonging to the technical field of coal water slurry preparation equipment, including a grinding shell, where a grinding mechanism is connected in the grinding shell. A lower part of the grinding shell is connected to a filter unit, where the filter unit is correspondingly arranged with a discharge port of the grinding mechanism. A lower part of the filter unit is correspondingly provided with a pulverized coal particle size distribution mechanism. An outlet end of the pulverized coal particle size distribution mechanism is communicated with a stirrer. The grinding mechanism includes a first bracket, where the first bracket is fixedly connected to inner side walls of the grinding shell. The first bracket is connected with step-by-step grinding units, a first adjusting unit and two second adjusting units.