Electrostatic Spray Dryer with Insulating Liner and Inert Gas
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Solution Overview
Problem
Existing spray dryer systems are large, costly, and inefficient, with issues related to electrostatic charging, cross-contamination, fine particle handling, and product damage from moisture, heat, and oxygen exposure, as well as high maintenance requirements and susceptibility to electrical malfunctions and explosions.
Innovation Solution
A modular, compact electrostatic spray dryer system with a non-metallic insulating liner, pressurized air-assisted electrostatic spray nozzle, and a recirculating inert gas system that reduces heating requirements, minimizes cross-contamination, and protects products from environmental damage, while featuring automatic filter cleaning and a gas blanket for product protection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If electrostatic spray nozzles are used to generate charged particles for faster drying, then drying speed is improved, but electrical controls may be impaired by unintentional grounding, causing system malfunction
Solution Approach 1:
The patent introduces a non-metallic insulating liner as an intermediary barrier between the electrostatically charged liquid and the metallic drying chamber components. This liner prevents unwanted electrical grounding while allowing the electrostatic charging function to operate effectively, thus resolving the conflict between improved drying speed and electrical control stability.
2Reliability
If the drying chamber is made of non-metallic material to insulate from charged liquid, then electrical control reliability is improved, but particles adhere to walls requiring time-consuming cleanup
Solution Approach 1:
The patent divides the drying chamber into two functional zones: a non-metallic insulating liner inner surface that prevents electrical grounding, and a metallic outer structure that provides structural support. The liner is designed with specific surface properties that reduce particle adhesion, allowing particles to be easily removed while maintaining electrical insulation.
3Productivity
If fine particles are generated during spray drying, then drying efficiency is improved, but particles create explosive conditions from inadvertent sparks in heating air
Solution Approach 1:
The patent employs an inert gas atmosphere (nitrogen or carbon dioxide) within the drying chamber to displace oxygen, creating an explosion-proof environment. This allows fine particles to be generated and dried efficiently without the risk of spontaneous combustion from electrical sparks, thus resolving the contradiction between drying efficiency and safety.
4Adaptability or versatility
If residual flavor material adheres to drying chamber walls, then cross-contamination between products occurs, but cleaning frequency increases
Solution Approach 1:
The patent applies a specific surface treatment or coating to the non-metallic liner that provides different properties in different locations: the inner surface is designed to be non-stick and easy to clean, while maintaining electrical insulation properties. This localized quality improvement reduces adhesion of residual materials, enabling frequent product changes with minimal cleaning requirements.
5Object-affected harmful factors
If complex cyclone separation and filter arrangements are used to remove airborne particles, then product protection is improved, but equipment cost and maintenance requirements increase
Solution Approach 1:
The patent extracts and removes the complex cyclone separation and filter systems from the drying chamber, replacing them with a simpler inert gas atmosphere and basic particulate removal mechanisms. This reduction in complexity maintains product protection while significantly lowering equipment cost and maintenance requirements.
Data Source
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AI summary
An electrostatic spray dryer for drying liquid into powder including an elongated cylindrical drying chamber having an electrostatic spray nozzle at an upper end and a powder collection vessel at a lower end. The powder collection vessel includes a removable and replaceable filter collections sock made of filter material for receiving and collecting dried powder from the drying chamber. For cleaning residual powder from an inside wall of the drying chamber, a scraper member is provided that is coupled by magnetic attraction to a manually removable driver on the external surface of the wall.