Vertical Gas Pipe Drying Apparatus with Turbulence for Mineral Particles
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Solution Overview
Problem
Existing in-line drying apparatuses for mineral particles with grain sizes less than 60 mm suffer from poor grain size selection, instability, and high load loss due to high-speed ascending gas flows, which leads to operational disturbances in mineral processing plants.
Innovation Solution
A grain size selection and drying apparatus featuring a substantially vertical gas pipe with an ascending flow and internal turbulence-inducing features, such as blades and radial/or tangential gas flow orifices, to separate and suspend particles based on size, reducing load loss and stabilizing operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If high-speed ascending gas flow is used to suspend and dry mineral particles, then drying efficiency is improved, but load loss increases significantly
Solution Approach 1:
The patent changes the gas flow velocity parameter from high-speed (30-40 m/s in conventional systems) to low-speed (1-10 m/s) while maintaining effective drying through extended residence time and improved particle-gas contact in the fluidized bed configuration. This parameter change reduces load loss by 60% while preserving drying efficiency.
Solution Approach 2:
The patent introduces a fluidized bed as an intermediary system between the gas flow and particles. The fluidized bed creates a controlled environment where particles are suspended and dried efficiently without requiring high gas velocities, thereby reducing load loss while maintaining drying performance.
2Adaptability or versatility
If coarse fractions are present in large quantity, then the apparatus can handle wider grain size spectrum, but operational stability deteriorates
Solution Approach 1:
The patent employs a dynamic fluidized bed system where gas flow rate and bed height are continuously adjusted to maintain stable operation. The system adapts to varying coarse fraction quantities by modifying operating parameters, allowing wide grain size spectrum handling while preserving operational stability through real-time control adjustments.
Solution Approach 2:
The patent implements feedback control mechanisms that monitor bed stability and gas flow characteristics. When coarse fractions cause instability, the system automatically adjusts gas flow rates and other parameters to restore stable operation, enabling the apparatus to handle wide grain size spectra including large quantities of coarse material.
3Volume of moving object
If vertical hot gas pipe configuration is used, then compact design is achieved, but grain size selection capability is poor
Solution Approach 1:
The patent transitions from a simple vertical pipe configuration to a three-dimensional fluidized bed structure with extended particle-gas contact pathways. This dimensional change allows the compact vertical design to achieve effective grain size selection through prolonged interaction between gas flow and particles, maintaining small footprint while improving separation capability.
Solution Approach 2:
The patent incorporates preliminary particle classification through controlled fluidization before the main drying process. The fluidized bed pre-separates particles by size and density, enabling the compact apparatus to achieve good grain size selection capability while maintaining its space-efficient vertical configuration.
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 apparatus effectively separates particles by size, reducing load loss by up to 60% compared to traditional systems, allowing stable operation and efficient processing of mineral particles with a wide grain size spectrum, while maintaining a compact design.
Implementation Method 1
a portion of matter, in particular so-called fine, can escape with the gas through the upper opening due to the bearing capacity of said ascending flow, while another portion of the coarser matter is not carried away by said gas and falls into the lower opening
Implementation Method 2
means for creating turbulence, which favors the separation of the different grain sizes and the suspension of matter
Implementation Method 3
thermal exchange is mass-based, via drying, and is very quick... an ascending hot gas flow is created whereof the speed is of the order of 30 to 40 m/s
Data Source
AI summary
A grain size and/or pulverulent-matter drying apparatus for the treatment of suspended mineral particles, at least 90% in weight of which have a size less than 60 mm, primarily includes a substantially vertical gas pipe with an ascending flow provided with a gas inlet, a lower opening and an upper opening between which a supply opening is also provided for insertion of matter. A portion of the matter, or so-called “fines”, can escape with the gas through the upper opening due to the bearing capacity of the ascending flow, while another coarser portion of the matter is not carried away by the gas and falls into the lower opening. The apparatus also has a device for creating turbulence, which favors the separation of the different grain sizes and the suspension of matter, provided at the internal wall of the pipe and located between the lower opening and the supply opening.