Dynamic Alarm Delay for Centrifugal Separator False Alarms
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Solution Overview
Problem
Centrifugal separators in marine and power plant applications often trigger unnecessary alarms due to low volume flow of liquids, leading to prolonged filling and pressure increase, which exceeds the alarm delay duration, causing false alarms.
Innovation Solution
The method involves adjusting the volume flow of the liquid into the separator and optimizing the alarm delay duration based on the volume flow, ensuring earlier alarm triggering during high flow conditions and reducing false alarms during low flow conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a fixed alarm delay duration is used, then the alarm system is simple to operate, but false alarms occur during low volume flow conditions
Solution Approach 1:
The alarm delay duration is changed from a fixed value to a dynamic value that automatically adjusts based on the measured volume flow rate. The control system continuously monitors the volume flow and calculates the appropriate alarm delay duration, allowing the system to adapt to varying operating conditions without manual intervention.
Solution Approach 2:
The system uses feedback from the volume flow measurement to adjust the alarm delay duration. The control system measures the actual volume flow rate, compares it with reference values, and uses this information to determine the appropriate alarm delay, creating a closed-loop control system that improves alarm accuracy.
2Speed
If the alarm delay is shortened to detect failures earlier, then failure detection speed improves, but false alarms increase during low volume flow conditions
Solution Approach 1:
The alarm delay duration dynamically adapts to the volume flow conditions. During high volume flow operations, the alarm delay is automatically shortened to enable faster failure detection, while during low volume flow conditions, the alarm delay is extended to prevent false alarms, thus resolving the contradiction between detection speed and false alarm reduction.
Solution Approach 2:
The system changes the time parameter (alarm delay duration) based on the volume flow rate parameter. By establishing a relationship between these two parameters, the system automatically selects appropriate alarm delay values that optimize both failure detection speed and false alarm prevention for different operating conditions.
3Reliability
If the alarm delay is extended to avoid false alarms during low volume flow, then false alarm reduction improves, but failure detection is delayed
Solution Approach 1:
The alarm delay duration is dynamically adjusted based on real-time volume flow measurements. During low volume flow conditions, the alarm delay is extended to avoid false alarms, while during high volume flow conditions, the alarm delay is reduced to enable timely failure detection, thus resolving the contradiction between false alarm reduction and failure detection timing.
Solution Approach 2:
The system establishes a dynamic relationship between volume flow rate and alarm delay duration, changing the time parameter according to the flow conditions. This parameter adaptation ensures that the alarm delay is optimized for each operating condition, preventing both false alarms and delayed failure detection.
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 optimizes the alarm delay duration, reducing false alarms during low volume flow conditions and ensuring timely alarm triggering during high volume flow, thereby improving the operational reliability of centrifugal separators.
Implementation Method 1
As the bowl rotates, the solids and/or the heavier liquid, i.e. the liquid having a higher density, are transferred into the outer part, the so-called sludge volume, of the bowl under the centrifugal force
Data Source
Figure 1
AI summary
A centrifugal separator and a method of using such a centrifugal separator (1) that comprises a bowl (2) for the liquid that is to be separated, the method comprising feeding the liquid to be separated into the bow (2), removing the separated liquid from the inner part (7) of the bowl, periodically removing slag from the outer pan (6) of the bowl during emptying cycles, measuring the pressure of the separated liquid that has been removed from the bowl (2), and triggering an alarm, if after the alarm delay subsequent to the emptying cycle, the pressure of the separated liquid that was removed from the bowl (2) is below a preset limit value. The volume flow of the liquid fed into the bowl (2) and separated is defined, and the duration of the alarm delay is adjusted on the basts of the volume flow of the liquid to be separated.