Heat Exchanger Cleaning via Elevated Temperature Treatment Stream
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Solution Overview
Problem
Heat exchangers used to cool water contaminated with polymer particles or additives experience fouling, reducing their effectiveness and requiring frequent dismantling and cleaning, which disrupts industrial processes.
Innovation Solution
A method involving passing a treatment stream at an elevated temperature compared to normal operation to the process side of the heat exchanger to remove deposits without dismantling, using either fresh water or a portion of the process water, which can be heated to increase the temperature and reduce fouling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the heat exchanger is operated continuously to cool process water, then productivity is maintained, but fouling accumulates on the walls reducing heat transfer effectiveness
Solution Approach 1:
The patent applies preliminary action by performing cleaning operations before fouling completely degrades heat exchanger performance. The method periodically introduces a treatment stream to remove deposits before they significantly reduce heat transfer effectiveness, thereby maintaining both continuous productivity and reliable heat transfer performance.
Solution Approach 2:
The patent implements continuity of useful action by designing a cleaning system that operates within the continuous process flow. The treatment stream is introduced through existing process water lines without requiring shutdown of the heat exchanger, ensuring that the useful cooling action continues uninterrupted while cleaning occurs simultaneously.
2Reliability
If the heat exchanger is dismantled for cleaning, then fouling is removed effectively, but process operation is stopped and complexity increases
Solution Approach 1:
The heat exchanger performs self-service cleaning by using the process water stream itself as the cleaning medium. The treatment stream, which is part of the normal process water flow, carries cleaning agents or conditions that remove fouling deposits automatically within the heat exchanger, eliminating the need for external dismantling and complex manual cleaning procedures.
Solution Approach 2:
The process water stream serves multiple functions: it cools the process material during normal operation and simultaneously acts as a cleaning medium during treatment phases. This multi-functionality eliminates the need for separate cleaning systems or dismantling procedures, reducing device complexity while maintaining cleaning effectiveness.
3Reliability
If the heat exchanger is cleaned frequently to maintain effectiveness, then heat transfer performance is preserved, but loss of time and productivity occur
Solution Approach 1:
The cleaning operation occurs continuously or periodically without interrupting the heat exchanger's cooling function. The treatment stream is introduced through the normal process water flow paths, allowing fouling removal to occur simultaneously with or between cooling cycles, thereby preserving heat transfer effectiveness without causing productivity loss.
Solution Approach 2:
The system performs preliminary cleaning actions that prevent fouling from accumulating to levels requiring extensive cleaning or shutdown. By continuously introducing the treatment stream at low concentrations during normal operation, the method maintains heat transfer effectiveness without needing to stop for intensive cleaning operations.
4Reliability
If treatment stream temperature is elevated to improve cleaning, then deposit removal effectiveness increases, but energy consumption increases
Solution Approach 1:
The system uses the heat exchanger's own process water stream as the treatment medium, heating and circulating it through the fouled surfaces. The thermal energy required for cleaning is provided by the process water itself, which absorbs heat during normal operation and uses this thermal energy for deposit removal, eliminating the need for separate external heating systems and reducing overall energy consumption.
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 method effectively cleans the heat exchanger without stopping the process, maintaining operational efficiency by removing deposits and preventing further fouling, allowing continuous operation with minimal disruption.
Implementation Method 1
passing to the process side of the heat exchanger a treatment stream whilst the heat exchanger is at an elevated temperature compared to the temperature when the heat exchanger is in operation
Data Source
AI summary
Method for treating a heat exchanger which in operation is used to cool process water which has been in contact with polymer particles. The method includes passing to the process side of the heat exchanger a treatment stream while the heat exchanger is at an elevated temperature compared to the temperature when the heat exchanger is in operation.