High-Temperature Heat Pump Gypsum Drying
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Solution Overview
Problem
The drying process of gypsum boards requires significant energy consumption, particularly from gas burners, and existing energy recuperation methods have not adequately addressed this issue without extending the drying time.
Innovation Solution
Employing high-temperature heat pumps to transfer heat from exhaust steam to a secondary closed circuit, which preheats incoming air for the drying process, thereby reducing the need for gas burners and optimizing energy use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If conventional heat exchangers and heat pumps are used for energy recuperation, then some energy recovery is achieved, but the drying process still requires large amounts of energy from gas burners
Solution Approach 1:
The patent changes the temperature parameter capability by introducing high-temperature heat pumps capable of delivering heat at temperatures above 100°C, which enables comprehensive replacement of gas burners throughout the drying process, particularly in high-temperature drying zones where conventional heat pumps were insufficient
Solution Approach 2:
The patent substitutes mechanical combustion systems (gas burners) with a thermal pump system that uses electrical power to drive heat transfer, replacing the mechanical/chemical energy conversion of burners with an electro-thermal system that recovers and redistributes waste heat
2Loss of energy
If existing energy recuperation methods are implemented, then some energy recovery is achieved, but the drying time is significantly extended
Solution Approach 1:
The patent implements continuous heat recovery throughout the entire drying process by placing heat exchangers in all drying zones and using multiple heat pumps operating simultaneously, ensuring that heat is continuously extracted from exhaust air and immediately reused to preheat incoming air, maintaining continuous drying action without interruption or time extension
Solution Approach 2:
The patent applies preliminary heating action by using recovered heat to preheat the air before it enters the drying zones, so that the air is already warmed from exhaust heat before encountering the wet material, thereby maintaining drying effectiveness while reducing overall energy input and avoiding time extension
3Temperature
If gas burners are used to provide high temperatures for drying, then the drying process is effective, but energy consumption is very high
Solution Approach 1:
The patent converts the harmful waste heat in exhaust air, which would otherwise be lost to the environment, into a beneficial resource by using heat exchangers to capture this waste heat and redirect it to preheat incoming air, thereby eliminating the need for gas burners to provide this heat and significantly reducing energy consumption while maintaining required drying temperatures
Solution Approach 2:
The drying system serves itself by using its own exhaust heat to preheat the air required for drying, creating a self-sustaining thermal cycle where the system's waste output becomes its own input, eliminating the need for external fuel sources and achieving energy self-sufficiency
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 significantly reduces energy consumption by utilizing high-temperature heat pumps to achieve efficient heat recuperation, allowing the drying process to be conducted without gas burners and maintaining the required temperature profile.
Implementation Method 1
an exhaust heat exchanger for transferring heat from the exhaust steam to a primary closed circuit circulating a first heat carrying medium
Implementation Method 2
at least one high-temperature heat pump having a primary, low temperature side connected to the primary closed circuit, and a secondary, high-temperature side, connected to a secondary closed circuit circulating a second heat carrying medium, the high-temperature heat pump being configured to provide a temperature on the secondary side of at least 160 degrees C
Implementation Method 3
a preheating heat exchanger connected to transfer heat from the secondary closed circuit to the flow of hot air
Implementation Method 4
heat is applied to dry the slurry... significant amounts of water need to be removed from the slurry
Data Source
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AI summary
A system for drying wet gypsum board, comprising a conveyor path for advancing wet gypsum board in a feeding direction, means for exposing the wet gypsum board to a flow of hot air, and an outlet arranged to remove a flow of exhaust steam dissipated from the wet gypsum board. The system further comprises an exhaust heat exchanger for transferring heat from the exhaust steam to a primary closed circuit circulating a first heat carrying medium, at least one high-temperature heat pump having a primary, low temperature side connected to the primary closed circuit, and a secondary, high-temperature side, connected to a secondary closed circuit circulating a second heat carrying medium, the high-temperature heat pump being configured to provide a temperature on the secondary side of at least 160 degrees C; and a preheating heat exchanger connected to transfer heat from the secondary closed circuit to the flow of hot air.