Drying Tower Heat Recovery for Grain Energy Savings
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Solution Overview
Problem
Existing drying towers for bulk agricultural materials, such as grains and seeds, are energy inefficient due to the lack of effective heat recovery systems, leading to high energy consumption and operational costs.
Innovation Solution
The implementation of a heat recovery system within the drying tower, which includes at least one heat exchanger to transfer heat from exhaust air to fresh air, reducing the energy required for preheating the fresh air and minimizing energy consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If no heat recovery system is used, then the structure is simple, but energy consumption is high
Solution Approach 1:
The patent converts the harmful waste heat in exhaust air into a beneficial resource by using it to preheat fresh air through a heat exchanger. This transforms the previously wasted thermal energy into useful preheating capacity, reducing the energy consumption of the drying system while adding a heat recovery component to the structure.
Solution Approach 2:
The patent recovers thermal energy from exhaust air that would otherwise be discarded. By introducing a heat exchanger that captures heat from the exhaust air stream and transfers it to the fresh air stream, the system recovers valuable thermal energy and reuse it, significantly reducing overall energy consumption.
2Loss of energy
If exhaust air is not cooled, then moisture condensation does not occur, but energy is wasted
Solution Approach 1:
The patent utilizes the phase transition of moisture from vapor to liquid condensate by cooling the exhaust air below its dew point in the heat exchanger. This phase transition not only recovers energy but also removes moisture from the exhaust stream, preventing energy waste and improving system efficiency.
Solution Approach 2:
The patent converts the previously harmful effect of moisture condensation (which could cause dust adhesion and energy loss) into a beneficial process. By controlled condensation in the heat exchanger, the system recovers thermal energy and removes moisture, transforming a potential problem into an energy recovery opportunity.
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 solution significantly reduces the energy consumption of the drying tower by preheating fresh air by about 20 Kelvin using heat recovered from exhaust air, thereby lowering operational costs and environmental impact.
Implementation Method 1
at least one heat exchanger is provided for transferring heat from the exhaust air to the fresh air
Implementation Method 2
the at least one heat exchanger of the heat recovery is dimensioned such that moisture from the exhaust air condenses thereon
Data Source
AI summary
A drying tower for bulk materials, in particular agricultural grains, includes a drying zone through which bulk material to be dried must pass from top to bottom, and an air guide for passing air through the drying zone. An air inlet is provided for introducing fresh air from the surroundings of the drying tower as supply air into the drying zone. An air outlet is provided for discharging exhaust air from the drying zone. A heat exchanger is provided for discharging heat from the exhaust air to the fresh air and an air return line for exhaust air is connected to the air outlet and the heat exchanger. An air supply line for fresh air is connected to the heat exchanger and the air inlet.