Coal Slime Dehydration for Low Moisture and Higher Calorific Value
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Solution Overview
Problem
Current coal slime dehydration methods result in high moisture content and low calorific value, affecting storage, transportation, and sales of coal slime products.
Innovation Solution
A method combining filter pressing dehydration and steam transient dehydration to achieve synergistic dehydration, involving filter pressing to form a filter cake, crushing and sieving, followed by steam transient dehydration of oversize particles to reduce moisture content.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If mechanical dehydration equipment such as quick-opening filter press and plate and frame filter press is used to concentrate and dehydrate coal slime water, then the dehydration process is simple and efficient, but the resulting dehydrated coal slime has high moisture content and low calorific value
Solution Approach 1:
The patent replaces purely mechanical dehydration systems with a hybrid system that combines mechanical filter pressing with thermal steam dehydration. The filter cake from mechanical dehydration is subjected to steam transient dehydration, substituting mechanical limitations with thermal energy transfer to achieve lower moisture content and higher calorific value in the final product
Solution Approach 2:
The patent changes the physical parameters of the dehydration process by introducing steam temperature and pressure as controllable variables. By adjusting steam transient dehydration parameters (temperature, pressure, time), the system achieves optimal moisture removal while maintaining high calorific value, transforming the dehydration outcome from high-moisture to low-moisture product
2Ease of manufacture
If mechanical dehydration equipment is used to dehydrate coal slime water, then the process is straightforward, but the dehydrated coal slime has low calorific value affecting storage, transportation, and sales
Solution Approach 1:
The patent merges mechanical dehydration and thermal dehydration processes into a unified synergistic system. The filter press and steam dehydration unit work in sequence, combining the simplicity of mechanical filtration with the effectiveness of thermal moisture removal, thereby improving calorific value while maintaining operational ease through integrated process design
Solution Approach 2:
The patent ensures continuous useful action by seamlessly connecting the mechanical filter pressing stage with the steam dehydration stage. The filter cake directly feeds into the steam dehydration chamber, eliminating idle time and ensuring that the dehydration process continuously progresses from mechanical to thermal treatment, maximizing energy efficiency and product quality
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 method achieves a moisture content of less than 15 wt% and increases calorific value by 2.5 MJ/kg, improving the utilization value of coal slime products.
Implementation Method 1
subjecting coal slime water to be treated to filter pressing dehydration to obtain a filter cake
Implementation Method 2
subjecting a resulting oversize to steam transient dehydration to obtain a dehydrated coal slime
Implementation Method 3
the steam transient dehydration is conducted at a saturated steam temperature of 264°C. to 295°C. and a steam pressure of 5 MPa to 8 MPa
Data Source
AI summary
Provided is a method for upgrading a coal slime through synergistic dehydration, including: subjecting coal slime water to be treated to filter pressing dehydration to obtain a filter cake; and crushing the filter cake, sieving and sizing, and subjecting a resulting oversize to steam transient dehydration to obtain a dehydrated coal slime.