Sulfur Granulator Segmented Lifting Flights
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Solution Overview
Problem
Current methods for producing sulfur seeds for granule enlargement in sulfur granulation processes are inefficient, requiring skilled operation, differing conditions for seed and granule production, and often result in undersized seeds that need recycling, leading to dust hazards and reduced production rates.
Innovation Solution
A system where sulfur spray nozzles produce solid sulfur seeds in a cooling tank, which are then transported to a granulating drum for enlargement, using segmented lifting flights and a cooling system to enable a one-pass continuous enlargement process, eliminating the need for screening and recycling, and improving cooling efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If sulfur seeds are produced by traditional methods in the granulating drum, then the seeds can be enlarged to granules, but the seeds are often undersized and require recycling, creating dust hazards and reducing production rates
Solution Approach 1:
The system separates the seed production function from the granule enlargement function by using a dedicated seed production zone in the drum. This segmentation allows optimized conditions for seed formation (with lifting flights to create curtain effects) separate from the enlargement zone, enabling precise control over seed size distribution while maintaining high production rates.
Solution Approach 2:
The system performs preliminary seed production with controlled size distribution before the enlargement process. By pre-forming seeds of appropriate size in a dedicated zone with lifting flights, the system eliminates the need for recycling undersized seeds, thereby preventing dust hazards and maintaining continuous high-speed production.
2Productivity
If crushing is used to process oversized product, then the product can be recycled, but dust is created that may be released into the environment and health hazards arise
Solution Approach 1:
The system extracts the seed production function from the main granulation process and implements it as a separate preliminary zone. This extraction eliminates the need for crushing and recycling operations, thereby removing the source of dust generation while still enabling product recycling through controlled seed formation and one-pass enlargement.
Solution Approach 2:
The system converts the potential harm of dust generation into a benefit by using lifting flights to create controlled curtain effects that promote uniform seed formation. This approach transforms what would be a harmful crushing operation into a beneficial controlled enlargement process that eliminates dust release while maintaining recycling capability.
3Temperature
If fans are used to force circulation of air through falling curtains for enhanced cooling, then cooler sulfur product is produced, but the fans become unbalanced from sulfur accumulation on blades
Solution Approach 1:
The system extracts the cooling function from the fan-driven air circulation approach and implements it through the natural cooling action of the falling sulfur curtains themselves. By removing the fans from the process, the system eliminates sulfur accumulation on blades while still achieving effective cooling through the geometric configuration and material properties of the falling particles.
Solution Approach 2:
The falling sulfur curtains perform their own cooling function through their natural motion and thermal properties, eliminating the need for external fan-driven air circulation. The system uses the self-cooling characteristic of the sulfur material in motion, thereby avoiding fan imbalance issues while maintaining effective temperature control.
4Manufacturing precision
If skilled operation is required for seed production, then quality control can be maintained, but system operation and maintenance become more difficult
Solution Approach 1:
The system implements self-regulating mechanisms through the lifting flights and curtain formation geometry that automatically produce uniform seed sizes without requiring skilled manual operation. The physical design of the lifting flights and drum configuration creates self-balancing conditions that maintain quality control through the inherent properties of the system rather than operator skill.
Solution Approach 2:
The system uses adjustable parameters such as lifting flight spacing, drum speed, and sulfur flow rate to control seed production. These parameter adjustments provide straightforward operational control mechanisms that maintain quality consistency while being easy to modify for different production requirements, eliminating the need for highly skilled operation.
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 allows for controlled size distribution and production rate of seeds, enabling high production rates with improved product quality and reduced environmental hazards, as well as easier system operation and maintenance.
Implementation Method 1
positioning sulfur spray nozzles over a cooling or forming tank where the nozzles spray liquid molten sulfur into a cooling liquid in the cooling tank
Implementation Method 2
Solid sulfur seeds are formed in the liquid as the liquid sulfur droplets solidify and settle in the tank
Implementation Method 3
the temperature of which is moderated by evaporation of water droplets sprayed into the drum
Data Source
AI summary
Sulfur (or sulphur) spray nozzles disposed with a tank spray liquid molten sulfur into the cooling liquid in the tank. Solid sulfur seeds are formed in the cooling liquid and settle in the tank. The tank may be a spiral dewaterer tank that has a screw conveyor at the bottom of the tank that moves the seeds to a granulating drum for enlargement into sulfur granules. The tank may also he used to capture and remove sulfur dust from a slurry of sulfur dust and water recycled from the granulating drum. The sulfur dust in the cooling tank may be captured by contact with molten sulfur droplets streaming down the cooling liquid column such that the dust particles become incorporated into the droplet, thereby being converted to seed. The granulating drum may be equipped with two or more sets of segmented lifting flights. The sets of flights may not be in alignment. The flights may be spaced apart from the inside surface of the drum with segmented rib members. The rib members may allow for the movement of sulfur seeds and granules between the nights and the inside surface of the drum as the drum rotates.