Coating Drum Drying via Electromagnetic Radiation and External Heating
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Solution Overview
Problem
Conventional methods for coating fertilizers using heated sweep gas are energy-intensive and inefficient, leading to pre-drying issues and increased costs due to the need for extensive solvent recovery processes.
Innovation Solution
The use of electromagnetic radiation and external/internal heat sources to evaporate solvents from coated materials, reducing the reliance on heated sweep gas for drying and solvent recovery, allowing for a more energy-efficient process with reduced sweep gas usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If heated sweep gas is used to evaporate solvent from coated materials, then solvent evaporation is achieved, but energy consumption increases significantly
Solution Approach 1:
The patent extracts the heating function from the sweep gas and places it in a separate heating zone. The sweep gas is no longer heated to evaporate solvent, but rather serves only as a carrier gas. A dedicated heating zone with heaters directly heats the coated particles to evaporate solvent, separating the heating function from the sweep gas flow.
Solution Approach 2:
The coating drum is divided into distinct zones: a coating zone where coating material is applied, and a separate heating zone where solvent evaporation occurs. This segmentation allows different functions (coating application and solvent removal) to occur in optimized environments without interfering with each other, reducing the energy required for solvent evaporation.
2Manufacturing precision
If heated sweep gas is used for solvent evaporation, then drying of coated material is achieved, but pre-drying problems occur that reduce coating quality
Solution Approach 1:
The coating drum is divided into distinct zones: a coating zone where coating material is applied, and a separate heating zone where solvent evaporation occurs. This segmentation allows different functions (coating application and solvent removal) to occur in optimized environments without interfering with each other, reducing the energy required for solvent evaporation.
Solution Approach 2:
The coating material is fully applied in the coating zone before the particles enter the heating zone. This preliminary completion of the coating application ensures that the coating structure is established before heating begins, preventing pre-drying issues that would occur if heating happened simultaneously with coating application.
3Device complexity
If heated sweep gas is used to evaporate solvent, then solvent removal is achieved, but extensive equipment is needed for solvent recovery
Solution Approach 1:
The heating function is extracted from the sweep gas and placed in a dedicated heating zone, allowing the sweep gas to serve only as a carrier. This simplifies the solvent recovery process because the sweep gas enters the condenser at a lower temperature and doesn't require extensive cooling capacity, reducing the complexity of the solvent recovery equipment.
Solution Approach 2:
The patent introduces a heating zone as an intermediary between the coating zone and the solvent recovery system. This intermediary allows solvent evaporation to occur in a controlled manner with direct heating of particles, resulting in more efficient solvent transfer to the sweep gas and easier subsequent condensation and recovery.
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
This approach decreases energy consumption, minimizes pre-drying problems, and enhances solvent recovery efficiency by directly heating the coated materials, resulting in lower operational costs and improved coating quality.
Implementation Method 1
heating the coated material, coating container, and/or an internal container that is configured to hold coated and/or uncoated material and is positioned in the interior volume of the coating container with: (i) electromagnetic radiation
Implementation Method 2
heat generated from an external heat source that is positioned outside of the interior volume of the coating container and is configured to heat a portion of the side wall of the coating container and/or internal container; (iii) and/or heat generated from a heat source positioned in the interior volume of the coating container that heats the internal container
Implementation Method 3
evaporating solvent from the coated material in an interior volume of a coating container having a side wall by heating the coated material, coating container, and/or an internal container
Data Source
AI summary
Methods, systems, and apparatuses for coating a material by contacting the material with a coating material and a solvent are disclosed herein. The coated material can be obtained by evaporating the solvent: by heating the coated material directly or indirectly with electromagnetic radiation; by heating with heat generated from a heat source that heats an internal container for the material to be coated and/or coated material; and/or in an interior volume of a coating container having a side wall, by heating a portion of the side wall of the coating container and/or internal container with a heat source that is positioned outside of the interior volume of the coating container.