Fluid-Bed Granulator Internal Cooling for Hot-Climate Control
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Solution Overview
Problem
Existing fluid-bed granulation processes face challenges in maintaining a controlled temperature environment, particularly in warmer climates, leading to high temperatures, reduced production capacity, and inconsistent product quality due to ambient air limitations and the difficulty in managing temperature profiles within the granulator.
Innovation Solution
A fluid-bed granulator system with an adjustable cooling setup, incorporating a recycle cooler connected to the fluid-bed granulator, which cools undersized particles before reintroducing them as seed particles, and distributes them through multiple inlets to maintain optimal temperature profiles independently of ambient conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If ambient air is used for cooling the granulator, then the cooling system is simple, but the temperature control becomes insufficient in warmer climates leading to high granulation temperatures
Solution Approach 1:
The cooling system is segmented into multiple independent cooling zones within the granulator, each capable of independent temperature control. This allows different regions to be cooled to different temperatures based on local heat generation, enabling effective temperature control without requiring an overly complex external cooling system.
Solution Approach 2:
Cooling media (such as cooled air or liquid coolant) are introduced as intermediaries between the heat-generating granulation process and the ambient environment. These cooling media absorb excess heat from the granules and transfer it away, enabling temperature control that is independent of ambient air temperature.
2Productivity
If high production capacity is achieved, then productivity increases, but temperature control becomes difficult leading to overheating
Solution Approach 1:
Cooling media are introduced at multiple points throughout the granulation process, before the granules become excessively hot. This preliminary cooling action prevents temperature buildup that would occur at high production rates, allowing sustained high productivity without overheating.
Solution Approach 2:
The cooling action is made continuous rather than intermittent, with cooling media constantly circulating through the granulator. This continuous cooling removes heat as fast as it is generated during high-speed granulation, maintaining temperature control even at maximum production capacity.
3Temperature
If fluidization airflow is increased to adjust temperature, then temperature control is achieved, but flow profile changes cause local hot or cold spots
Solution Approach 1:
The granulator is divided into multiple cooling zones with independent temperature control, allowing each zone to be optimized without affecting others. This segmentation prevents the formation of local hot or cold spots that would result from uniform airflow adjustments across the entire granulator.
Solution Approach 2:
Different regions of the granulator are provided with different cooling intensities tailored to their specific heat generation characteristics. This local quality approach ensures uniform temperature distribution by addressing the thermal needs of each zone independently rather than applying a uniform cooling strategy.
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 system ensures consistent product quality and increased production capacity by effectively controlling temperature within the granulator, reducing the impact of ambient temperature fluctuations and maintaining desired product properties.
Implementation Method 1
a recycle cooler (6) is located between the exit for undersized particles (3c) and the fluid-bed granulator (1), thereby effectively cooling the undersized particles (3c) before entering the fluid-bed granulator (1)
Implementation Method 2
The fluidization air used in a fluid bed granulation process has two purposes, it fluidizes the particles and it is used to provide heating or cooling of the particles
Implementation Method 3
The fluid-bed granulation process is based on providing granulation seeds, which grow by absorbing very small droplets of a growth liquid
Implementation Method 4
The term 'atomized' used within the invention refers to a mixing process of the liquid urea melt (or other suitable fertilizer melts) with a pressurized medium like air. This mixing process creates a liquid/gas emulsion or an aerosol of small droplets
Data Source
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AI summary
The invention relates to a Fluid-bed granulator system with adjustable cooling setup at least comprising: a.) a fluid-bed granulator (1), b.) a first cooler (2) externally connected with the fluid-bed granulator (1) or forming an internal part of the fluid-bed granulator (1), c.) a product screen (3) connected with the first cooler (2) and the fluid-bed granulator (1), wherein the product screen (3) at least comprises an exit for final on-size product particles (3a) and an exit for oversized particles (3b) and an exit for undersized particles (3c), wherein the exit for the undersized particles (3c) is connected with the fluid-bed granulator (1) and wherein the exit for the oversized particles (3b) is connected with the fluid-bed granulator (1) via one or more crushers (4), - wherein a recycle cooler (6) is located and connected between the fluid-bed granulator (1) and the exit for undersized particles (3c); and/or - wherein the recycle cooler (6) is located between the fluid-bed granulator (1) and the exit for the oversized particles (3b); and wherein the recycle cooler (6) is connected with the fluid-bed granulator via one or two or more recycle inlets (16).