Multi-Stage HMFO Desulfurization While Preserving Fuel Properties
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Solution Overview
Problem
The marine shipping industry faces a significant challenge in producing low sulfur heavy marine fuel oil (HMFO) that meets MARPOL Annex VI emissions requirements due to the lack of technically viable solutions and economic incentives for refiners to remove environmental contaminants like sulfur, nitrogen, phosphorous, metals, and asphaltenes from high sulfur HMFO without altering its desirable properties.
Innovation Solution
A multi-stage device and process involving a pre-treatment stage and a core process using a stripper column, distillation column, or reactive distillation column, combined with a reaction system comprising various reactor vessels and catalysts, to transform distressed fuel oil materials into a feedstock HMFO, followed by a reaction with an activating gas mixture to produce a low sulfur HMFO compliant with ISO 8217 standards.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If conventional refining processes are used to remove sulfur from heavy marine fuel oil, then sulfur content is reduced, but the desirable bulk properties of HMFO (viscosity, density, lubricity) are altered or degraded
Solution Approach 1:
The process segments the treatment into two distinct stages: pre-treatment to remove asphaltenes and stabilizers, followed by core desulfurization. This segmentation allows each stage to target specific contaminants without adversely affecting the bulk properties, as the pre-treatment prepares the feedstock for selective sulfur removal while preserving the desired fuel characteristics.
Solution Approach 2:
The patent introduces an intermediary activating gas mixture (containing hydrogen and other gases) that mediates the desulfurization reaction. This intermediary enables selective sulfur removal through chemical reaction while the catalyst and process conditions are tuned to preserve bulk properties like viscosity and density, thus resolving the contradiction between sulfur reduction and property maintenance.
2Object-affected harmful factors
If environmental contaminants are removed from high sulfur HMFO, then emissions compliance is improved, but the production cost increases due to lack of economic incentives for refiners
Solution Approach 1:
The process employs self-service mechanisms where the activating gas mixture and catalyst work together to selectively remove sulfur and other contaminants without requiring expensive additional processing steps. The pre-treatment stage prepares the feedstock to enhance the efficiency of the core desulfurization process, reducing overall production costs while achieving emissions compliance.
Solution Approach 2:
The patent utilizes parameter changes in the form of controlled temperature, pressure, and gas composition during the desulfurization process to optimize contaminant removal while minimizing energy consumption and operational costs. By adjusting these parameters, the process achieves cost-effective sulfur reduction that maintains economic viability for refiners.
3Manufacturing precision
If multi-stage processing is implemented to produce low sulfur HMFO, then product quality is improved, but device complexity increases
Solution Approach 1:
The multi-stage processing is segmented into distinct functional units: pre-treatment for asphaltene removal and core desulfurization for sulfur removal. Each unit is designed with specific functionality, allowing for modular implementation that improves product quality while managing complexity through clear functional separation rather than a monolithic complex system.
4Object-affected harmful factors
If aggressive desulfurization is applied to meet MARPOL requirements, then sulfur content is reduced, but by-product hydrocarbon production increases
Solution Approach 1:
The process employs controlled parameter changes in temperature, pressure, and gas composition to achieve selective desulfurization. By optimizing these parameters, the process removes sulfur through chemical reaction while minimizing unwanted hydrocarbon cracking and by-product formation, thus reducing material loss while meeting sulfur content requirements.
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 process effectively reduces sulfur and vanadium content by 80-90% while maintaining the bulk properties of HMFO, producing a merchantable low sulfur HMFO that meets ISO 8217 and MARPOL Annex VI requirements, minimizing the production of by-product hydrocarbons.
Implementation Method 1
A multi-stage device and process involving a pre-treatment stage and a core process using a stripper column, distillation column, or reactive distillation column, combined with a reaction system comprising various reactor vessels and catalysts
Implementation Method 2
A multi-stage device and process involving a pre-treatment stage and a core process using a stripper column, distillation column, or reactive distillation column
Data Source
AI summary
A multi-stage process for reducing the production of a Product Heavy Marine Fuel Oil from Distressed Fuel Oil Materials (DFOM) involving a pre-treatment process that transforms the DFOM into Feedstock HMFO which is subsequently sent to a Core Process for removing the Environmental Contaminates. The Product Heavy Marine Fuel Oil complies with ISO 8217 for residual marine fuel oils and has a sulfur level has a maximum sulfur content (ISO 14596 or ISO 8754) between the range of 0.05 mass % to 1.0 mass. A process plant for conducting the process is also disclosed.