Pulse Combustion Drying of Heat-Sensitive Proteins
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Solution Overview
Problem
High-temperature drying processes for heat-sensitive protein compositions (HSPCs) often compromise energy efficiency and product quality, as they can lead to protein denaturation and degradation of functional properties, while traditional spray drying methods are inefficient and prone to mechanical issues.
Innovation Solution
The use of high-temperature pulsed air streams in pulse combustion spray drying (PCSD) techniques, which atomize and dry the feed simultaneously, maintaining outlet temperatures below protein denaturation temperatures to minimize protein denaturation and enhance energy efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If high-temperature drying processes are used, then energy efficiency is improved, but protein denaturation occurs and functional properties deteriorate
Solution Approach 1:
The patent applies periodic action by using pulsed combustion cycles where fuel is intermittently introduced and combusted, creating periodic high-temperature zones that rapidly evaporate moisture while allowing cooling periods between pulses. This periodic heating prevents sustained protein denaturation while maintaining high drying efficiency.
Solution Approach 2:
The patent implements the skipping principle by rapidly passing the protein slurry through the high-temperature zone in minimal residence time. The material is quickly accelerated through the combustion zone, rushing through the dangerous temperature range before significant denaturation can occur, then immediately cooled.
2Object-affected harmful factors
If traditional spray drying is used, then protein quality is preserved, but mechanical issues occur and maintenance costs increase
Solution Approach 1:
The patent replaces mechanical atomization systems (rotating disks, nozzles, pumps) with a pneumatic injection system. The protein slurry is injected directly into the pulsed combustion zone where gas dynamics and acoustic waves provide the atomization and drying functions, eliminating mechanical wear and maintenance requirements.
Solution Approach 2:
The system achieves self-service by using the energy from the combustion process itself to drive the drying and atomization functions. The pulsed combustion generates acoustic waves and gas flow patterns that automatically atomize and dry the slurry without requiring separate mechanical atomization equipment.
3Object-affected harmful factors
If spray drying is conducted below denaturation temperatures, then protein quality is maintained, but process efficiency suffers
Solution Approach 1:
The pulsed combustion creates periodic high-temperature zones that briefly exceed denaturation temperatures during the combustion phase, then cool during the exhaust phase. This periodic action allows the system to achieve high drying rates during hot phases while protein damage is minimized during cooling phases, overall improving efficiency while maintaining quality.
Solution Approach 2:
The system rushes the slurry through the high-temperature zone so quickly that even though temperatures exceed denaturation points, the residence time is insufficient for significant protein damage. This allows efficient high-temperature drying while preserving protein quality.
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
PCSD achieves high energy efficiency and preserves the functional properties of HSPCs, resulting in dried products with low moisture content and superior physical and functional characteristics compared to traditional methods, with reduced maintenance costs and operational challenges.
Implementation Method 1
drying the heat-sensitive protein composition by contacting the heat-sensitive protein composition with a pulsed gas stream of a pulse combustion dryer
Implementation Method 2
using pulsating jets to atomize and dry the feed simultaneously
Data Source
AI summary
Methods for pulse combustion spray drying of heat-sensitive protein compositions using high temperature pulsating jets to atomize and dry the feed simultaneously are described herein. Methods and compositions described herein provide dried protein-containing compositions with low protein denaturation and other useful functional properties at high operational efficiencies.