Drywall Sheet Drying with Impingement Jet Aeration
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Solution Overview
Problem
Existing drying methods for sheet-like materials, such as drywall sheets, face inefficiencies in energy consumption and uniformity, particularly with impingement jet aeration systems, which result in high energy expenditure and potential material damage due to uneven drying and high exhaust air temperatures.
Innovation Solution
The method involves splitting the drying process into a main and final stage, utilizing impingement jet aeration with controlled air flow and wall flaps to optimize air distribution, and leveraging condensation heat for energy efficiency, allowing for uniform drying and reduced energy consumption by adjusting the temperature and humidity levels across the drying chamber.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If impingement jet aeration is used to achieve uniform drying across the width of sheets, then drying uniformity is improved, but energy consumption increases due to high exhaust air temperatures
Solution Approach 1:
The drying chamber is divided into multiple independently controllable drying zones along the feed direction. Each zone has its own air supply and exhaust system, allowing separate control of temperature and airflow parameters. This segmentation enables optimization of energy usage in each zone while maintaining overall drying uniformity across the sheet width.
Solution Approach 2:
The system dynamically adjusts drying parameters including air temperature, humidity, and flow rates in different zones based on real-time monitoring. By changing these parameters adaptively rather than maintaining constant high temperatures throughout, the system achieves uniform drying while reducing overall energy consumption and exhaust air temperatures.
2Productivity
If cross-flowing heated air is used for drying, then drying speed is improved, but drying uniformity deteriorates due to cooling of air across the width
Solution Approach 1:
The system transitions from traditional single-direction cross-flow to a three-dimensional airflow pattern using impingement jets that blow air perpendicularly onto the sheet surface from multiple angles. This dimensional change in airflow direction creates more uniform heat and mass transfer across the sheet width while maintaining high drying speeds.
Solution Approach 2:
Multiple impingement jet nozzles are arranged to create replicated airflow patterns across the width of the drying chamber. Each nozzle group replicates the same high-velocity jet pattern, ensuring uniform drying conditions across different横向 positions while maintaining high drying efficiency.
3Use of energy by moving object
If longitudinal aeration is used to reduce energy consumption, then energy efficiency is improved, but drying uniformity deteriorates due to long air path
Solution Approach 1:
The system uses periodic or pulsed impingement jet operation in different zones rather than continuous uniform airflow. This periodic action allows better control of heat and mass transfer, improving drying uniformity while reducing overall energy consumption compared to continuous longitudinal aeration.
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 approach achieves energy-efficient drying with reduced energy expenditure and prevents material damage by ensuring uniform drying across the width of the sheets, utilizing waste heat effectively and maintaining low temperatures for optimal material preservation.
Implementation Method 1
The drying of such sheet-like materials is carried out in most cases by means of a predominantly convective heat transfer in the form of cross-flowing of heated air
Implementation Method 2
The drying air in this case is increasingly enriched with moisture
Implementation Method 3
For heating fresh air by means of a heat exchanger, condensation heat can then be purposefully utilized
Implementation Method 4
the condensation heat contained within the exhaust air humidity
Data Source
AI summary
A method and device for drying sheets is described. The sheets are guided through a drier divided into drying chambers and brought in contact with the drying air by means of impinging jet aeration. The impinging-jet aeration utilizes cross-aerated nozzle boxes and the main drying stage exhaust air is introduced in the pressure chamber of one or more drying chambers in the first half of the final drying stage. Pan of the exhaust air in the recirculated-air operation is used for drying in the drying chamber and part of the exhaust air is introduced into the suction chamber of the respective subsequent drying chamber. The exhaust air collectively passes through the final drying stage in this manner, and the exhaust air from one or more drying chambers in the second half of said stage is extracted at a significantly lower temperature.