MPEX Network for Lighter Crude Processing
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Solution Overview
Problem
Existing systems for processing lighter crude oil face challenges such as increased operating pressures and vaporization issues, leading to decreased throughput and quality in crude and vacuum units, which are typically designed for heavier crudes.
Innovation Solution
Incorporating both a preflash drum and a preflash column to pre-process lighter crude oil, where the crude feed is heated and separated into vapor and liquid streams, with the liquid stream being further heated and subjected to steam stripping in the preflash column, allowing for reduced operating pressures and efficient vapor removal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If existing crude and vacuum units are used to process lighter crudes, then the units can handle the feed, but increased operating pressures and vaporization of lighter components occur leading to decreased throughput and quality
Solution Approach 1:
The preflash drum performs preliminary separation of vapor and liquid phases from the crude feed before it enters the main crude unit. By removing a portion of the vapor phase in advance, the system prevents excessive vaporization in the main unit, thereby maintaining throughput and quality while enabling processing of lighter crudes.
Solution Approach 2:
The processing system is divided into two distinct stages: a preflash drum for initial vapor-liquid separation, and the main crude unit for further processing. This segmentation allows the lighter components to be partially removed beforehand, preventing the harmful effects of excessive vaporization in the main unit while maintaining its productivity.
2Object-generated harmful factors
If a preflash drum is added to separate vapor and liquid phases, then lighter components can be removed, but the vapor phase still adds throughput volume to the crude or vacuum unit
Solution Approach 1:
The preflash drum extracts and removes a significant portion of the vapor phase from the crude feed before it enters the main crude unit. By taking out the vapor components in advance, the system reduces the throughput volume that would otherwise be imposed on the vacuum unit, thereby maintaining its productivity while still achieving effective separation.
3Measurement precision
If a preflash column with steam stripping is used to improve separation efficiency, then vapor phase can be withdrawn, but pressure increase in the preflash column occurs
Solution Approach 1:
The preflash drum performs preliminary vapor-liquid separation at relatively low pressure before the crude feed enters the preflash column. This preliminary action reduces the burden on the preflash column, allowing it to operate at moderate pressures while still achieving effective separation through steam stripping.
Solution Approach 2:
The separation process is segmented into two stages: low-pressure separation in the preflash drum, followed by steam stripping in the preflash column. This segmentation allows the system to achieve high separation efficiency without requiring the entire system to operate at high pressures.
4Adaptability or versatility
If multiple flash zones are implemented to separate vapors and liquids, then certain advantages are achieved, but excess vapor production is not resolved
Solution Approach 1:
The preflash drum and preflash column work together to extract and remove vapor phases from the crude feed in two sequential stages. By taking out the vapor components in advance, before the feed enters the main crude unit, the system resolves the issue of excess vapor production while maintaining enhanced processing capability.
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 significantly reduces the need for high operating pressures, minimizes vapor production, and allows for the production of a valuable naphtha fraction, enhancing the processing efficiency and quality of lighter crude oil while maintaining existing equipment with minimal retrofitting.
Implementation Method 1
the crude feed is heated and separated into vapor and liquid streams
Implementation Method 2
the heated liquid stream is subjected to steam stripping in the preflash column
Implementation Method 3
the crude feed is heated and separated into vapor and liquid streams, with the liquid stream being further heated
Data Source
AI summary
Plants and methods are presented for crude feed pre-processing before feeding the crude feed into a crude unit or vacuum unit. Pre-processing is preferably achieved with a combination of a preflash drum and a preflash column that allows for high-temperature treatment of the liquids and separate vapor phase handling, which advantageously enables retrofitting existing plants to accommodate lighter crude feeds.