Pyrolysis Reactor Char Removal and Gas Temperature Control
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Solution Overview
Problem
Existing pyrolysis reactor systems face inefficiencies in char removal and temperature control, leading to heat loss and incomplete conversion of waste plastics to fuel, particularly in achieving uniform gas temperatures and optimal chain lengths for downstream distillation processes.
Innovation Solution
A pyrolysis reactor system with a disc-shaped baffle plate and counter-helical agitation blades for effective char scraping, combined with a contactor having an upper chamber with a heat exchanger for uniform temperature control and active cooling, allowing for precise temperature and pressure management to optimize gas chain lengths and condensation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional pyrolysis reactor systems are used, then the basic conversion of waste plastics to fuel occurs, but char removal is inefficient and heat loss increases
Solution Approach 1:
The patent extracts and removes char from the reactor system using a dedicated removal mechanism. The reactor incorporates a char removal system that actively extracts accumulated char from the reaction zone, preventing heat loss and maintaining conversion efficiency. This separates the char removal function from the pyrolysis reaction function, allowing independent optimization of each process.
Solution Approach 2:
The patent employs temperature and pressure control mechanisms to optimize the pyrolysis process parameters. By dynamically adjusting temperature profiles and pressure conditions, the system maximizes conversion efficiency while minimizing energy loss. The controller modifies operational parameters in real-time to maintain optimal conditions for fuel production.
2Device complexity
If simple reactor design is used, then device complexity is reduced, but temperature control uniformity deteriorates
Solution Approach 1:
The patent implements localized heating zones with independent temperature control within the reactor. Different regions of the reactor can maintain different temperature profiles optimized for specific stages of pyrolysis. This local quality approach ensures uniform overall temperature distribution while avoiding the need for complex global heating systems.
Solution Approach 2:
The reactor incorporates temperature sensors and controllers that provide feedback to maintain uniform temperature distribution. The control system monitors temperature at multiple points and adjusts heating elements accordingly, ensuring consistent thermal conditions throughout the reaction zone without requiring overly complex reactor geometry.
3Device complexity
If contactor without heat exchanger is used, then device complexity is reduced, but gas temperature uniformity deteriorates
Solution Approach 1:
The patent introduces a heat exchanger as an intermediary component in the contactor system. This heat exchanger acts as a mediator between the hot pyrolysis gases and the cooling medium, facilitating controlled heat transfer. The intermediary enables precise temperature regulation of the gas stream, ensuring uniform temperatures for downstream distillation processes while adding only moderate complexity to the contactor design.
4Device complexity
If pressure control is not implemented, then device complexity is reduced, but chain length optimization deteriorates
Solution Approach 1:
The patent implements pressure control as a可调 parameter to optimize the pyrolysis reaction outcomes. By controlling pressure within specific ranges, the system influences the chain length distribution of the produced hydrocarbons. The pressure control system allows adjustment of operational conditions to favor formation of desired chain lengths for specific fuel products, achieving precise control over product specifications.
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 system achieves efficient char removal, minimizes heat loss, and ensures uniform gas temperatures, enabling longer chain hydrocarbon condensation and improved conversion efficiency, facilitating the production of desired fuel products by tuning the system for specific end products.
Implementation Method 1
the contactor further comprises an upper chamber above the contactor element or elements, said upper chamber having a heat exchanger for providing a desired uniform temperature of gases exiting the contactor
Implementation Method 2
a contactor has a bank of condenser elements on which long-chain gas components condense and fall back into the reactor
Implementation Method 3
a system for conversion of waste plastics to fuel
Data Source
Figure 1
Figure 2
Figure 3(a)~3(d)
AI summary
A pyrolysis reactor system comprises a reactor and a contactor mounted above the reactor. The reactor has a shell, an inlet and an outlet. A central shaft runs along its axis and supports agitation blades in a counter-helical arrangement, and an auger. Rotation of the auger in one direction feeds feedstock into the vessel, and in the opposite direction removes char at the end of a batch. The contactor comprises four elements (60) with a frusto-conical part (61) supported on vertical support arms, and being connected to a disc by legs. The contactor elements (60) allow short chains to pass through apertures (65, 66) while long chains condense on their surfaces or on the vessel wall (68) surface. There is dynamic tuning of carbon number of gases flowing downstream by active temperature and pressure control at the contactor.