Continuous Hydrothermal Carbonization Reactor Design
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Solution Overview
Problem
Current HTC reactors operate in a batch mode, leading to discontinuous processes with potential waiting times and accidents due to shut-off valves, which hinder continuous carbonization.
Innovation Solution
A continuously operating reactor design featuring a tubular or combination of tubular and pressure vessel reactors without shut-off valves, utilizing conveyor devices for solids and liquids, and agitators to prevent caking, with heat transfer via double jackets and internal shafts to maintain consistent temperature and flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If batch reactors are used for HTC, then operational simplicity is maintained, but continuous carbonization cannot be achieved leading to waiting times and reduced productivity
Solution Approach 1:
The reactor is divided into multiple zones (heating zone, reaction zone, cooling zone, separation zone) that function simultaneously to enable continuous processing. Each zone performs a specific function, allowing the system to maintain continuous operation while managing complexity through functional segmentation.
Solution Approach 2:
The reactor design eliminates batch operations by implementing continuous feed and discharge mechanisms. Material continuously moves through the reactor zones, and products are continuously separated, eliminating waiting times and achieving sustained productive action without interruption.
2Reliability
If shut-off valves are used in batch reactors, then operational control is achieved, but accidents and interruptions occur preventing continuous operation
Solution Approach 1:
Shut-off valves are completely removed from the system. Instead of using valves to control flow, the design relies on pressure differentials and continuous flow dynamics to move material through the reactor, eliminating the reliability issues and operational complexities associated with valve operation.
Solution Approach 2:
The system uses its own pressure and flow dynamics to automatically control material movement through the reactor zones. The continuous flow is self-regulating based on pressure gradients, eliminating the need for external valve control and improving both reliability and ease of operation.
3Productivity
If high pressure and temperature are applied for HTC, then carbonization efficiency is improved, but energy consumption increases
Solution Approach 1:
Material is pre-heated in a dedicated heating zone before entering the main reaction zone. This preliminary heating reduces the energy required in the subsequent carbonization zone, as the material already reaches a significant portion of the target temperature, thereby improving overall energy efficiency while maintaining high carbonization efficiency.
Solution Approach 2:
The system recovers heat from the cooling zone and uses it to pre-heat incoming material or water. This heat recovery mechanism reduces the overall energy consumption by reusing thermal energy that would otherwise be wasted, allowing the system to maintain high carbonization efficiency with lower net energy input.
4Productivity
If material is continuously moved through the reactor, then productivity is improved, but material agglomeration and caking occur
Solution Approach 1:
Vibration elements are incorporated into the reactor to continuously agitate the material during its passage through the zones. This mechanical vibration prevents particles from settling and agglomerating, maintaining material uniformity and preventing caking while allowing continuous flow through the system.
Solution Approach 2:
The material undergoes controlled phase transitions (heating, reaction, cooling) as it moves through different zones. These phase changes, combined with continuous movement and vibration, prevent agglomeration by keeping particles in a state that resists sticking together, thereby maintaining compositional stability during continuous processing.
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
Enables continuous carbonization without interruptions, optimizing energy use and preventing material agglomeration, while ensuring efficient heat transfer and product dryness through dewatering devices.
Implementation Method 1
heat transfer via double jackets and internal shafts to maintain consistent temperature and flow
Implementation Method 2
conveyor devices for solids and liquids
Implementation Method 3
agitators to prevent caking
Implementation Method 4
product dryness through dewatering devices
Data Source
Figure 1
Figure 2
Figure 3
AI summary
The reactor (2, 4) comprises straight or curved pipe sections, which are connected to each other using rectangular or oblique T-pieces such that they form a continuous reactor body. The reactor is formed from a combination of pipes and pressure vessels, and has a highest point, at which the reaction temperature reaches its highest value so that process between the already carbonized biomaterial and non-carbonated biomaterial is excluded by convection induced mixing. The individual pieces of a handling and mixing equipment exhibit in the form of screws. The reactor (2, 4) comprises straight or curved pipe sections, which are connected to each other using rectangular or oblique T-pieces such that they form a continuous reactor body. The reactor is formed from a combination of pipes and pressure vessels, and has a highest point, at which the reaction temperature reaches its highest value so that process between the already carbonized biomaterial and non-carbonated biomaterial is excluded by convection induced mixing. The individual pieces of handling and mixing equipment exhibit in the form of screws to prevent the carbonizing material from entering into the reactor wall and from protruding into the reactor tube. The handling and mixing equipment is present in the form of a rigid shaft with a screw or a flexible shaft without screw and driven by externally arranged drives, which are joined together as a chain drive for synchronization. The flexible shaft is fixed on the mixing and production tools in the form of a paddle. A multi-material conveyor (3, 7) present at an input of the reactor promotes the carbonizing biomaterial under pressure in the reactor. A pressure lock present at an end of the reactor removes mixture of water and carbonated coal under pressure. Each reactor section is equipped with a jacketed section, which is formed and adapted for heat transfer by means of a heat carrier fluid. Shafts of the conveyor are formed as concentric double pipes for transferring heat and conveying heat transfer fluid. A double rotary joint is present in the reactor for introducing and removing a heat carrier into the conveyor shaft. An independent claim is included for a method of providing a controllable temperature zone within a continuously operating reactor.