Thermal Hydrolysis Apparatus with Segmented Heat Exchangers
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Solution Overview
Problem
Current methods for thermal hydrolysis of organic matter in sewage sludge are inefficient due to high energy demands, potential for incrustations, and suboptimal pressure management, leading to reduced hydrolysis rates and increased costs.
Innovation Solution
An apparatus with separate heat exchangers for heating and cooling, allowing for decoupled pressure control and medium selection, combined with a throttle for rapid decompression and additional cooling/heating elements for efficient heat management, promotes controlled hydrolysis and reduces primary energy consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional thermal hydrolysis methods are used, then organic matter can be hydrolyzed, but high energy demands and potential for incrustations occur
Solution Approach 1:
The heating and cooling processes are segmented into separate heat exchangers, allowing independent optimization of each process. The heating heat exchanger operates at high temperature for rapid hydrolysis while the cooling heat exchanger separately handles heat recovery, preventing energy waste and incrustation formation through separate process zones
Solution Approach 2:
The system changes pressure and temperature parameters dynamically through the throttle device and separate heat exchangers. Rapid decompression via throttle creates flash cooling effect that prevents incrustations, while controlled heating phases maintain optimal hydrolysis rates. The separate heat exchangers allow different temperature profiles for heating and cooling operations
2Ease of operation
If single heat exchanger system is used, then device complexity is reduced, but pressure control and heat management efficiency decrease
Solution Approach 1:
The thermal processing system is divided into separate heating and cooling heat exchangers, each capable of independent pressure control. This segmentation allows the throttle device to effectively manage pressure transitions without being constrained by a single heat exchanger design, improving operational flexibility despite increased system complexity
Solution Approach 2:
Both the heating and cooling heat exchangers serve dual purposes: they function as heat transfer devices and as pressure control elements. The throttle device integrated with this system provides rapid decompression capability that serves both safety and process optimization functions, reducing the need for additional specialized components
3Productivity
If rapid decompression is implemented, then hydrolysis efficiency increases, but system complexity and energy management difficulty increase
Solution Approach 1:
The throttle device for rapid decompression is merged with the cooling heat exchanger system. The flash cooling effect generated by rapid pressure reduction is directly utilized in the cooling process, eliminating the need for separate rapid decompression equipment and reducing overall system complexity while maintaining high hydrolysis efficiency
Solution Approach 2:
The rapid decompression process, which could potentially cause harmful effects, is converted into a beneficial flash cooling effect. This controlled rapid expansion cools the hydrolyzed material quickly, preventing incrustation formation and improving hydrolysis efficiency while the cooling heat exchanger recovers the thermal energy that would otherwise be wasted
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 enhances hydrolysis efficiency, reduces energy demands, and prevents incrustations, enabling higher reaction rates and cost-effective operation while maintaining efficient heat transfer and hydrolysis process control.
Implementation Method 1
heat exchangers are provided as heating element and as cooling element, respectively, which exchange heat between the organic matter and a medium
Implementation Method 2
a throttle is provided which causes rapid decompression of the organic matter by release of flash steam and hydrolysis gas
Implementation Method 3
a condensation tank is provided in which flash steam from the decompressed organic matter is condensed
Data Source
AI summary
The invention relates to an apparatus for thermal hydrolysis of organic matter, wherein a heating element (2) and a cooling element (4) are provisioned to heat up or cool down the organic matter. Heat exchangers are provisioned as heating element (2) and cooling element (4) which exchange heat between the organic matter and a medium. The organic matter and the medium are separate relative to each other within the heat exchangers. A throttle (9) and a decompression tank (10) are provisioned between the heating element (2) and the cooling element (4).