Regenerative Pyrolysis Reactor Approach Temperature Control
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Solution Overview
Problem
Current pyrolysis processes in steam cracking furnaces face challenges in maintaining favorable feed conversion and light olefin yields while minimizing coke production, requiring complex temperature and pressure control and external quenching processes.
Innovation Solution
A regenerative reverse-flow thermal pyrolysis reactor with an elongated tube design, featuring pre-heated and pre-cooled heat transfer zones, allows for efficient pyrolysis and heating modes with controlled approach temperatures, reducing the need for external quenching and optimizing thermal integration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If external quenching processes are used to maintain light olefin yields and minimize coke production, then product quality is improved, but device complexity and energy consumption increase
Solution Approach 1:
The patent merges the quenching function with the reactor wall itself by incorporating heat transfer zones directly into the reactor structure. The reactor wall serves dual purposes: containing the reaction and providing quenching through controlled heat transfer, thereby eliminating the need for separate external quenching equipment and reducing overall system complexity.
Solution Approach 2:
The reactor performs self-quenching by utilizing its own thermal mass and heat transfer capabilities. The heat transfer zones embedded in the reactor wall automatically remove excess heat from the pyrolysis process, allowing the system to regulate its own temperature and quench products without requiring external quenching infrastructure.
2Manufacturing precision
If complex temperature and pressure control systems are implemented to maintain favorable feed conversion and light olefin yields, then product quality is improved, but device complexity and energy consumption increase
Solution Approach 1:
The patent utilizes controlled changes in approach temperature as a key parameter to optimize feed conversion and light olefin yields. By adjusting the temperature differential between the reactor interior and heat transfer zones, the system achieves favorable conversion rates and product yields while maintaining energy efficiency through optimized thermal management.
Solution Approach 2:
The reactor employs periodic alternation between pyrolysis mode and heating mode. During pyrolysis mode, the reaction proceeds with heat transfer zones removing excess heat. During heating mode, the thermal mass is regenerated. This periodic operation allows for controlled temperature management that maintains high feed conversion and light olefin yields without requiring continuous complex control systems.
3Object-generated harmful factors
If approach temperature is reduced to minimize coke production, then coke yield is reduced, but maintaining favorable feed conversion becomes more difficult
Solution Approach 1:
The patent applies different thermal conditions to different zones within the reactor. The heat transfer zones are strategically positioned to create localized temperature gradients that minimize coke formation in critical areas while maintaining higher temperatures in reaction zones to ensure favorable feed conversion. This spatial differentiation of thermal quality allows simultaneous optimization of both coke reduction and conversion efficiency.
Solution Approach 2:
The system dynamically adjusts approach temperature during operation, alternating between pyrolysis mode where heat is removed and heating mode where thermal mass is regenerated. This dynamic control allows the system to maintain optimal temperature differentials that prevent excessive coke formation while ensuring sufficient thermal energy is available for high feed conversion rates.
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 energy efficiency, maintains light olefin yields, and minimizes coke production by effectively managing thermal integration and approach temperatures within the reactor, allowing for flexible operation within practical temperature, pressure, and residence time ranges.
Implementation Method 1
Heat is transferred from the reactor to the feed in the first heat transfer zone
Implementation Method 2
Heat is transferred from the pyrolysis product to the reactor in the second heat transfer zone
Implementation Method 3
At least a portion of the heated feed's hydrocarbon is pyrolysed in the reaction zone
Data Source
AI summary
The invention relates to approach temperatures and approach temperature ranges that are beneficial in operating a pyrolysis reactor, to pyrolysis reactors exhibiting a beneficial approach temperature, to processes for carrying out hydrocarbon pyrolysis in a pyrolysis reactor having a beneficial approach temperature. The pyrolysis reactor can be, e.g., a reverse-flow pyrolysis reactor, such as a regenerative reverse-flow pyrolysis reactor.