Fractionation Column Dew Point Control via Real-Time Calculation
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Solution Overview
Problem
Current methods for controlling steam stripped fractionation columns lack the necessary instrumentation and calculations to prevent column flooding, leading to operational upsets and increased corrosion due to inadequate dew point monitoring.
Innovation Solution
The implementation of a control apparatus with specific instrumentation, including mass flow meters, temperature gauges, and pressure gauges, connected to a computer system that calculates the dew point and dew point margin in real time, providing operators with timely warnings to adjust operations and prevent flooding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If steam is added to the fractionation column for separation, then separation efficiency is improved, but water condensation and flooding risk increase
Solution Approach 1:
The system performs preliminary calculation of dew point temperature and dew point margin before actual condensation occurs. By continuously monitoring the difference between overhead temperature and calculated dew point temperature, the system provides advance warning to operators, allowing them to adjust steam addition rates before flooding conditions develop.
Solution Approach 2:
The system establishes a feedback loop by continuously measuring overhead temperature and pressure, calculating dew point parameters, and comparing them against safe operating thresholds. This feedback mechanism enables real-time monitoring and adjustment of steam stripping operations to maintain separation efficiency while preventing water condensation and column flooding.
2Measurement precision
If more instrumentation is added for dew point monitoring, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The system uses a computer as an intermediary to perform complex dew point calculations based on readily available process data (overhead temperature and pressure measurements). Rather than requiring complex specialized instrumentation, the computer acts as a mediator that transforms simple measurements into precise dew point predictions through calculated parameters.
Solution Approach 2:
The invention replaces the need for complex mechanical dew point measurement instrumentation with a computational approach. Instead of using specialized physical instruments to directly measure dew point, the system uses a computer to calculate dew point temperature and margin based on standard temperature and pressure gauge readings, substituting mechanical measurement complexity with computational analysis.
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 solution effectively prevents undesirable condensation and minimizes energy consumption by enabling real-time dew point monitoring and control, reducing the risk of column flooding and associated operational issues.
Implementation Method 1
a molecular weight analyzer or a specific gravity analyzer, in communication with the overhead vapor line
Implementation Method 2
a molecular weight analyzer or a specific gravity analyzer, in communication with the overhead vapor line
Implementation Method 3
a temperature gauge, and a pressure gauge are in communication with the overhead vapor line
Implementation Method 4
a temperature gauge, and a pressure gauge are in communication with the overhead vapor line
Implementation Method 5
a stripper hydrocarbon liquid mass flow meter in fluid communication with the hydrocarbon liquid outlet line, or a stripper reflux hydrocarbon liquid mass flow meter in communication with the stripper reflux line, and a stripper net overhead hydrocarbon liquid mass flow meter in communication with the stripper net overhead liquid line
Implementation Method 6
a water flow meter in communication with a water outlet line from the water outlet of the receiver
Implementation Method 7
the computer wherein the difference between the calculated dew point temperature of the steam passing overhead in the column and the measured top temperature is calculated
Data Source
AI summary
Apparatus for controlling the operation of fractionation columns to avoid column flooding is described. The apparatus uses mass flow meters to measure the mass flow rates of the receiver vapor, and the stripper hydrocarbon liquid stream or the stripper reflux and the stripper net overhead liquid. The water from the receiver can be measured with either a volumetric flow meter or a mass flow meter. The apparatus also includes at least one computer in communication with a molecular weight analyzer or specific gravity analyzer; an overhead vapor line pressure gauge; an overhead vapor line temperature gauge; a hydrocarbon liquid outlet line temperature gauge; the stripper hydrocarbon stream mass flow meter, or the stripper reflux hydrocarbon liquid mass flow meter and the stripper net overhead hydrocarbon liquid mass flow meter; the vapor mass flow meter; and the water flow meter.