Low-Temperature Dryer for Gypsum Boards Using Counter-Flow Heat Recovery
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Solution Overview
Problem
Existing dryers for gypsum plasterboards typically operate at high temperatures (200-300°C), which are energy-intensive and can cause structural damage to the boards, whereas low-temperature drying is more energy-efficient and environmentally friendly but requires longer drying times.
Innovation Solution
A low-temperature dryer design that uses warm air to dry gypsum plasterboards at temperatures below 130°C, with a first zone for initial heating and moisture absorption, followed by heat exchangers to recover and reuse heat, and a second zone for further heating and moisture removal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If high-temperature drying (200-300°C) is used, then drying speed is improved, but energy consumption increases and structural damage occurs
Solution Approach 1:
The patent changes the drying temperature parameter from conventional high temperatures (200-300°C) to low temperatures (below 130°C, preferably 20-80°C). This parameter change fundamentally alters the drying mechanism while maintaining effectiveness, reducing energy consumption by 30% and preventing structural damage to the boards
Solution Approach 2:
The patent implements continuous drying across multiple zones (first zone for initial heating, second zone for further drying) with continuous air circulation and heat exchange. This ensures uninterrupted drying action throughout the dryer, maintaining productivity despite lower temperatures
2Productivity
If high-temperature drying (200-300°C) is used, then drying speed is improved, but structural damage to boards occurs
Solution Approach 1:
The patent changes the temperature parameter to below 130°C (preferably 20-80°C), which eliminates the harmful thermal effects that cause structural damage while maintaining drying effectiveness through extended exposure time and continuous air circulation
Solution Approach 2:
The dryer is divided into multiple zones (first zone for initial heating and moisture absorption, second zone for further drying) with different temperature profiles and air circulation patterns. This segmentation allows gradual moisture removal without thermal shock, preventing structural damage
3Use of energy by moving object
If low-temperature drying is used, then energy consumption is reduced, but drying time increases
Solution Approach 1:
The patent employs continuous air circulation through fans and heat exchangers that operate throughout the drying process. This continuous action maximizes moisture transfer efficiency at low temperatures, reducing the time penalty associated with lower drying temperatures
Solution Approach 2:
The patent incorporates heat exchangers that recover heat from exhaust air and feed it back into the drying system. This feedback mechanism maintains efficient heat utilization throughout the process, compensating for the longer drying time required at low temperatures
4Use of energy by moving object
If low-temperature drying is used, then energy consumption is reduced, but throughput decreases
Solution Approach 1:
The dryer is divided into multiple zones (first zone for initial heating, second zone for further drying) that can operate with different air circulation patterns and temperature profiles. This segmentation allows optimized drying in each zone, maintaining overall throughput despite lower temperatures
Solution Approach 2:
Multiple fans create continuous air circulation through both drying zones simultaneously, ensuring that drying action is uninterrupted and maximized throughout the entire dryer. This continuous multi-zone operation maintains throughput while reducing energy consumption
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 low-temperature dryer reduces energy consumption by 30% compared to conventional high-temperature dryers, allows for a higher throughput of boards due to extended drying time, and prevents structural damage to the boards.
Implementation Method 1
a first heater flowing between the levels in a section or in a first plurality of sections, wherein the boards are heated in a first zone in the longitudinal direction and in the conveying direction of the boards to a temperature preferably below 130° C.
Implementation Method 2
the air is led out of the dryer through at least one first heat exchanger in the opposite direction to the conveying direction after absorbing moisture from the boards
Implementation Method 3
the air, after absorbing moisture from the boards
Implementation Method 4
the air is led out of the dryer through at least one first heat exchanger
Data Source
AI summary
A dryer for drying boards to be conveyed through the dryer in a plurality of sections extending one behind the other in the longitudinal direction and each having a plurality of levels using a heating medium at a temperature below 130° C., characterized in that the boards are heated during the drying process in a first zone in the longitudinal direction and in the conveying direction of the boards with warm air flowing between the levels, the boards can be heated to a temperature below 130° C. in a first zone in the longitudinal direction and in the conveying direction of the boards by warm air generated by a first heater in one or a first plurality of zones, and in that the air can be led out of the dryer counter to the conveying direction through at least one first heat exchanger after absorbing moisture from the boards.