Coal Granular Flow Regime Prediction for Transportation Safety
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Solution Overview
Problem
The transportation of pulverized coal is prone to slipping and spreading due to external disturbances, leading to safety risks, air pollution, and potential spontaneous combustion or explosions, as existing methods fail to accurately predict and manage the coal's flow regimes during transit.
Innovation Solution
A method and system that acquire coal particle data, determine a particle model, establish a constitutive theoretical model describing solid-like, liquid-like, gas-like, and inertial flow regimes, numerically discretize the model, calculate the coal granular medium's movement, and plot the results to assess the safety of the transportation process using meshless particle methods like SPH, SDPH, and DEM.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional transportation methods are used for pulverized coal, then the transportation process is simple, but the coal particles slip and spread causing safety risks and air pollution
Solution Approach 1:
The patent performs preliminary actions by acquiring coal particle data and determining particle models before transportation issues occur. The constitutive theoretical model predicts flow regimes and slipping behavior in advance, allowing preventive measures to be taken before safety risks materialize.
Solution Approach 2:
The patent implements feedback by continuously monitoring coal particle flow characteristics during transportation and comparing them against the constitutive theoretical model predictions. This feedback loop enables real-time assessment of transportation safety and adjustment of transportation parameters.
2Measurement precision
If a comprehensive model describing all flow regimes is established, then prediction accuracy is improved, but calculation complexity increases
Solution Approach 1:
The patent segments the complex coal granular medium flow into four distinct flow regimes (solid-like, liquid-like, gas-like, and inertial) and establishes separate theoretical models for each regime. This segmentation allows accurate prediction of each flow type while managing overall model complexity through modular structure.
Solution Approach 2:
The patent uses parameter changes to transition between different flow regime models based on the actual state of the coal particles. By monitoring key parameters such as velocity, density, and particle concentration, the system automatically selects and switches between appropriate theoretical models for each flow regime.
3Measurement precision
If numerical discretization is performed to obtain discrete equations, then the movement process can be calculated accurately, but the calculation time increases
Solution Approach 1:
The patent applies partial discretization by numerically discretizing only the constitutive theoretical model equations that require high precision, while other parts of the system use simplified approaches. This selective discretization maintains accuracy where needed while reducing overall calculation time.
Data Source
AI summary
The present disclosure relates to a method and system for determining transportation safety of pulverized coal. The method includes: acquiring coal particle data during transportation of pulverized coal, where the coal particle data is size data of a coal particle accumulation; determining a particle model of the coal particle accumulation during the transportation of the pulverized coal according to the size data; establishing a constitutive theoretical model to describe all flow regimes of a coal granular medium; numerically discretizing the constitutive theoretical model by using a numerical method to obtain discrete equations; calculating a movement process of the coal granular medium according to the discrete equations and the particle model of the coal granular medium to obtain a calculation result; plotting the calculation result by using post-processing software Tecplot to obtain relevant information of a coal particle flow; and determining whether the pulverized coal transportation process is safe.