Formaldehyde-Free Urea Granulation for Stronger Bulk Granules
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Solution Overview
Problem
Existing urea production methods, particularly granulation, rely on formaldehyde addition to enhance mechanical strength, incurring high costs and environmental risks, while prilling, despite being cheaper, produces fragile prills unsuitable for bulk handling.
Innovation Solution
A granulation process using a urea melt with purity greater than 98% without formaldehyde, allowing for improved mechanical strength and uniform granule structure, eliminating the need for formaldehyde and reducing environmental impact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If formaldehyde is added to improve mechanical strength of solid urea, then the mechanical strength increases, but the production cost and environmental impact worsen
Solution Approach 1:
The invention extracts and eliminates the harmful additive (formaldehyde) from the granulation process while maintaining the desired mechanical strength through alternative means (optimized granulation parameters and urea melt composition), thereby reducing production costs and environmental impact
Solution Approach 2:
The invention changes the parameters of the granulation process, specifically using urea melt with 96-98% concentration instead of higher concentrations, and optimizing granulation conditions to achieve adequate mechanical strength without formaldehyde addition
2Strength
If formaldehyde is added to improve mechanical strength of solid urea, then the mechanical strength increases, but the environmental impact worsens
Solution Approach 1:
The invention removes the harmful substance (formaldehyde) from the production process, eliminating its negative environmental impact while maintaining product quality through alternative granulation methods
Solution Approach 2:
The invention converts the previously harmful formaldehyde additive requirement into a benefit by demonstrating that formaldehyde-free granulation with optimized parameters can achieve adequate mechanical strength, thereby eliminating environmental harm
3Ease of manufacture
If prilling technique is used to reduce production cost, then the production cost decreases, but the mechanical strength of the product worsens
Solution Approach 1:
Instead of accepting the inherent fragility of prills as unavoidable, the invention inverts the approach by using granulation technique with optimized parameters to achieve both cost-effectiveness and adequate mechanical strength, challenging the conventional wisdom that granulation is always more expensive
4Manufacturing precision
If urea concentration is increased to improve product quality, then the purity increases, but the water removal requirement and energy consumption increase
Solution Approach 1:
The invention applies partial action by using urea melt with 96-98% concentration rather than requiring complete water removal to achieve 99%+ purity, thereby achieving satisfactory product quality with reduced energy consumption for evaporation
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
Produces formaldehyde-free urea granules with superior mechanical strength and environmental friendliness at lower costs, leveraging existing evaporation infrastructure for efficient water removal.
Implementation Method 1
a suitable concentration and evaporation section designed to completely remove the water
Implementation Method 2
spraying liquid urea onto granules inside a proper granulator, for example in a fluid bed; the liquid forms a layer which solidifies, thus increasing the size of the granule
Data Source
AI summary
Method for producing solid urea by granulation, wherein the granulation is fed with liquid urea having a purity greater than 98% by weight and not containing formaldehyde.