Integrating Fischer-Tropsch Reactor in Refinery Hydrocracker
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Solution Overview
Problem
The integration of gas-to-liquids (GTL) processing within refinery plants, especially those designed for heavy crude oils, is hindered by high capital costs and inefficiencies, particularly for small-scale plants, due to mismatched plant designs and the need for standalone GTL units.
Innovation Solution
Integrating a Fischer-Tropsch reactor within an existing crude oil processing plant to utilize excess syngas and hydrocracking capacity, thereby reducing capital costs and enhancing the production of Fischer-Tropsch liquid products by coupling the Fischer-Tropsch reactor with the steam methane reformer, shift reactor, and hydrocracker, and using a saturator to recycle and generate steam, thereby optimizing the production of hydrocarbon streams and diesel products.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a standalone GTL plant is built, then GTL processing capability is achieved, but capital costs become relatively high especially for small scale plants
Solution Approach 1:
The patent combines GTL processing units with existing refinery operations, integrating syngas generation from crude oil distillation with Fischer-Tropsch synthesis. This merging eliminates the need for separate standalone GTL plant infrastructure, thereby reducing capital costs while maintaining GTL processing capability.
Solution Approach 2:
The refinery plant is designed to perform multiple functions: traditional crude oil processing and GTL synthesis. By making the existing plant multi-functional, the need for dedicated GTL infrastructure is reduced, lowering capital investment requirements while achieving versatile processing capabilities.
2Adaptability or versatility
If a refinery plant is designed for heavy crude oil, then heavy crude processing capability is optimized, but efficiency decreases when processing light crude oil
Solution Approach 1:
The patent implements dynamic operational modes that allow the refinery to adapt between heavy and light crude oil processing. The system can switch between traditional hydrocracking modes for heavy crude and syngas generation modes for light crude, optimizing efficiency for each feedstock type while maintaining processing flexibility.
3Ease of manufacture
If excess capacity is utilized through integration, then capital costs are reduced, but plant design complexity increases
Solution Approach 1:
The patent divides the integrated plant into distinct functional segments: light crude distillation unit, syngas generation section, Fischer-Tropsch synthesis unit, and product upgrading section. This segmentation allows for modular design and operation, managing complexity while enabling flexible utilization of excess capacity across different units.
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 integration reduces capital costs by utilizing excess capacity, enhances the cetane number of diesel products, and efficiently utilizes excess syngas, thereby improving the overall operational efficiency and product quality without the need for new upgrade units.
Implementation Method 1
The hydrogen production section includes a steam methane reformer
Implementation Method 2
The hydrogen production section includes a steam methane reformer and a shift reactor
Implementation Method 3
A Fischer-Tropsch reactor is preferably coupled to the hydrogen production section and the crude oil processing section
Data Source
AI summary
A crude oil processing plant that comprises a Fischer-Tropsch reactor is disclosed. The crude oil processing plant comprises a crude oil processing section and a hydrogen production section. The hydrogen production section is coupled to a hydrocracker in the crude oil processing section to deliver a high purity hydrogen stream. The Fischer-Tropsch reactor receives a syngas stream from the hydrogen production section and produces a hydrocarbon stream. When light crude oil is processed, the hydrocracker typically has excess capacities to upgrade the hydrocarbon stream from the Fischer-Tropsch reactor.