Shell and Tube Thermosiphon Reboiler Leak Detection Using Process Data
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Solution Overview
Problem
Tube leaks in shell and tube thermosiphon reboilers are difficult to detect, leading to conditions like corrosion, fluid contamination, over pressurization, and energy wastage, as there is typically no instrumentation within the reboiler to detect these leaks.
Innovation Solution
An automated method using a control circuit that continuously monitors various process data from sensors to determine if the reboiler is in service, inactive, losing heating fluid, and heat exchanging, generating an alert when tube leakage is detected, and optionally shutting down the reboiler.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If no instrumentation is installed within the reboiler, then the device complexity is reduced and ease of manufacture is improved, but the ability to detect tube leaks deteriorates
Solution Approach 1:
The patent introduces an intermediary detection system that monitors process variables (temperatures, pressures, flow rates) from existing sensors located outside the reboiler. A control circuit analyzes these intermediary measurements to infer tube leak conditions, avoiding the need for direct instrumentation within the reboiler while still achieving effective leak detection.
Solution Approach 2:
The patent replaces direct mechanical/electrical instrumentation within the reboiler with a logical/software-based detection system. The control circuit uses logic-based evaluation of process data from existing sensors to detect leaks, substituting physical measurement devices with an intelligent analysis system that processes indirect measurements.
2Productivity
If tube leaks are not detected early, then the reboiler can continue operating without interruption, but harmful effects such as corrosion, fluid contamination, and energy wastage increase
Solution Approach 1:
The patent implements preliminary detection by continuously monitoring process variables and analyzing them to identify early signs of tube leaks. The control circuit detects leak conditions before they progress to severe damage, enabling preventive maintenance actions that protect against corrosion, contamination, and energy wastage while minimizing production interruptions.
Solution Approach 2:
The patent establishes a feedback mechanism where the control circuit continuously receives process data from sensors, analyzes the information, and generates alerts when leak conditions are detected. This closed-loop feedback system enables real-time monitoring and early warning, allowing operators to take corrective action before harmful effects escalate.
3Measurement precision
If multiple process parameters are monitored and analyzed, then the precision of leak detection is improved, but the complexity of the detection system increases
Solution Approach 1:
The patent makes the control circuit multi-functional by enabling it to perform both normal process control functions and leak detection functions using the same hardware and software platform. The control circuit analyzes multiple process parameters for both control and diagnostic purposes, eliminating the need for separate dedicated leak detection instrumentation and reducing overall system complexity.
Solution Approach 2:
The patent merges the leak detection system with the existing process control system. The control circuit combines multiple sensor inputs (temperatures, pressures, flow rates) and uses integrated logic to simultaneously perform process control and leak detection, consolidating functions that would traditionally require separate systems into a unified platform.
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
Enables early detection and minimization of undesirable effects from tube leaks, allowing for effective maintenance and production planning, using existing sensors and logic-based evaluation to reduce errors in leak identification.
Implementation Method 1
a shell and tube thermosiphon reboiler used to drive a fractionating column... monitoring temperatures of shell-side bottoms fluid respectively input to and output from the reboiler by a thermosiphon process in the reboiler
Data Source
AI summary
A method to continuously monitor for tube leakage in a shell and tube thermosiphon reboiler for heating feedstock in a fractionating column includes: determining the column is in service by continuously monitoring an input flow of the feedstock into the column; determining the reboiler is inactive by continuously monitoring an output valve of tube-side heating fluid from the reboiler; determining the reboiler is losing the heating fluid by continuously monitoring an output flow of the heating fluid from the reboiler; determining the reboiler is heat exchanging by continuously monitoring a temperature difference between input and output flows of shell-side bottoms fluid with the column; and determining the tube leakage in the reboiler is taking place when the column is determined to be in service, the reboiler is determined to be inactive, the reboiler is determined to be losing the heating fluid, and the reboiler is determined to be heat exchanging.