Electrostatic Spray Drying With Water-Jacketed Powder Cooling
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Solution Overview
Problem
Conventional spray drying techniques expose heat-sensitive compounds to damaging temperatures during the drying process, particularly in downstream filter apparatus, leading to degradation and inefficiencies.
Innovation Solution
An electrostatic spray drying system with water jacketed heat exchangers in the powder direction and connecting conduit, which immediately cool the powder and gas mixture to ambient temperatures before separation, using chilled water to prevent overheating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional spray drying techniques are used, then drying efficiency is improved, but heat-sensitive compounds are exposed to damaging temperatures causing degradation
Solution Approach 1:
The system performs preliminary cooling action by introducing cooled air into the drying chamber before the heat-sensitive compounds complete their drying process. The air cooling system pre-cools the environment, and cooled air is continuously supplied to reduce temperature exposure during the critical drying phase, preventing degradation while maintaining drying efficiency.
Solution Approach 2:
The patent introduces cooled air as an intermediary substance between the heating source and the heat-sensitive compounds. This cooled air acts as a thermal buffer, absorbing excess heat and reducing the temperature exposure of the compounds during drying, thereby protecting them while allowing the drying process to proceed efficiently.
2Reliability
If lower operating temperatures are used to protect heat-sensitive compounds, then compound viability is improved, but drying time increases
Solution Approach 1:
The system maintains continuous useful action by simultaneously performing drying and cooling operations. The air cooling system operates continuously throughout the drying process, allowing the compounds to be dried while constantly exposed to cooled air, thus eliminating the need for separate cooling steps and reducing total processing time while maintaining compound viability.
Solution Approach 2:
The system performs preliminary cooling preparation by pre-cooling the air before it enters the drying chamber. This preliminary action ensures that the cooling effect is immediately available when heat-sensitive compounds are introduced, allowing rapid temperature reduction without extending the overall drying time.
3Productivity
If downstream filter apparatus is used to separate dried powder, then powder collection is improved, but dried particles are exposed to high temperatures for prolonged times causing degradation
Solution Approach 1:
The patent introduces cooled air as an intermediary that flows through the filter system, creating a temperature gradient that protects dried particles during their passage through the filter apparatus. This cooled air intermediary reduces the temperature exposure of particles in the filter system while maintaining efficient powder collection and separation.
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
The system effectively protects heat-sensitive powders from high temperatures, enabling higher production rates and faster drying with increased potency and efficiency.
Implementation Method 1
water jacketed heat exchangers in the powder direction and connecting conduit, which immediately cool the powder and gas mixture to ambient temperatures
Implementation Method 2
using chilled water to prevent overheating
Implementation Method 3
spray drying liquids into dry powder form
Implementation Method 4
heated air is introduced for drying the liquid into powder
Data Source
Figure 1
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Figure 3~4
AI summary
An electrostatic spray drying system comprising an electrostatic spray nozzle for directing electrically charged liquid into a drying chamber, a drying gas inlet from which drying gas is simultaneously directed, and a conical powder direction plenum for receiving drying gas and entrained dried powder for direction to a filter containing powder separation plenum via a connecting conduit. The powder direction plenum and connecting conduit each have a surrounding water jacket heat exchanger through which cooling water is directed for cooling the drying gas and powder below damaging temperatures prior to entry into the powder separation plenum. The powder separation plenum has a return line for redirecting separated drying gas to the drying chamber through a condenser, blower, and heater for reuse in the system, with condensed water being selectively redirected to the inlet of the powder direction plenum heat exchanger and/or to the cooling water supply.