Integrated Knockout Drum Cooling for Refinery Cleaning Effluent
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Solution Overview
Problem
Conventional cleaning methods for refinery equipment, such as heat exchangers and pumps, result in the production of a two-phase effluent containing high amounts of light to non-condensable gases, leading to increased system pressure, flare load, and potential pump cavitation, which complicates the cleaning process and requires inefficient handling.
Innovation Solution
An integrated knockout drum and heat exchanger system that condenses and cools the effluent within a single unit, reducing system pressure and flare load by allowing vapor and liquid to disengage directly, thus enhancing the efficiency and safety of the cleaning process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional cleaning methods are used to clean refinery equipment, then contaminants are removed from the equipment, but high amounts of light to non-condensable gases are produced in the effluent, increasing system pressure and flare load
Solution Approach 1:
The patent combines the knockout drum and heat exchanger into a single integrated unit. The heat exchanger is positioned inside the knockout drum, allowing simultaneous condensation of effluent and separation of vapor-liquid phases in one compact system, thereby reducing the volume of harmful effluent gases while maintaining cleaning effectiveness
Solution Approach 2:
The integrated unit changes the temperature parameter of the effluent by cooling it through the heat exchanger. This temperature reduction causes condensation of light hydrocarbons and water vapor, transforming the effluent from a high-volume gas phase to a reduced-volume liquid phase, thus decreasing system pressure and flare load
2Reliability
If separate knockout drum and heat exchanger systems are used, then effluent can be handled, but the system occupies more space and requires more complex installation
Solution Approach 1:
The patent merges two separate pieces of equipment (knockout drum and heat exchanger) into one integrated unit. The heat exchanger is installed within the knockout drum structure, eliminating the need for separate installations and reducing overall system complexity while maintaining full effluent handling capability
Solution Approach 2:
The heat exchanger is nested inside the knockout drum, with the heat exchanger shell positioned within the drum's interior space. This nested configuration allows the smaller heat exchanger to be housed within the larger knockout drum structure, reducing the total footprint and simplifying installation while preserving both functions
3Productivity
If effluent is not condensed and cooled, then the cleaning process can proceed quickly, but system pressure increases and pump cavitation may occur
Solution Approach 1:
The integrated unit performs preliminary condensation and cooling of the effluent as it enters the knockout drum, before the effluent reaches downstream equipment. This preliminary action reduces the volume and pressure of the effluent in advance, preventing pump cavitation and allowing the cleaning process to proceed quickly without pressure buildup
Solution Approach 2:
The heat exchanger induces phase transition by cooling the effluent, causing vapor (light hydrocarbons and water vapor) to condense into liquid. This phase change from gas to liquid dramatically reduces the effluent volume and system pressure, eliminating cavitation risks while maintaining rapid cleaning 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
The integrated system effectively reduces system pressure and flare load, shortens the cleaning process duration, and ensures safe handling of the effluent, preventing pump cavitation and atmospheric releases.
Implementation Method 1
An integrated knockout drum and heat exchanger system that condenses and cools the effluent within a single unit
Implementation Method 2
condenses and cools the effluent within a single unit, reducing system pressure and flare load
Data Source
AI summary
A unit and system are operable with cooling fluid for handling effluent produced in a cleaning process of refinery equipment. A drum of the unit has an inlet for the effluent, a liquid outlet for condensed effluent, and a vapor outlet for uncondensed effluent. A shell disposed in an interior of the drum and has a passage communicating outside the drum. A heat exchanger is disposed in the passage of the shell. As the effluent from the inlet enters the shell's passage at the distal end of the shell, the heat exchanger cools the effluent using cooling fluid cycled through the heat exchanger. Condensed effluent escaping from the shell can fill the drum's interior up to a liquid level. Uncondensed effluent escaping from the shell can collect in the open space of the drum, being subject to further condensation.