Acoustic Sensor Filter Cleaning Detection
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Solution Overview
Problem
Current methods for detecting the cleaning process of bag filters in metallurgical exhaust gas cleaning systems are costly and lack functional reliability, as they require extensive technical effort and separate measurements for each compressed air reservoir, failing to accurately monitor filter bag cleanliness and mechanical or compressed air issues.
Innovation Solution
The use of offset acoustic sensors to detect the 'cleaning bang' noise during the compressed air blast, analyzing audio data streams to determine if filters are correctly cleaned, allowing for reliable detection of cleaning processes and identifying potential malfunctions without precise timing or additional equipment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If direct pressure measurement at the upstream compressed air reservoir is used for each segment, then the functionality of the filter hose can be monitored, but the costs increase significantly due to separate pressure measurement and evaluation for each compressed air reservoir
Solution Approach 1:
A single acoustic sensor system performs the function of monitoring multiple compressed air reservoirs and filter bags, replacing the need for separate pressure measurement systems for each reservoir. The acoustic sensor detects cleaning process signals from multiple sources, providing universal monitoring capability across the entire filter system.
Solution Approach 2:
The patent replaces the mechanical pressure measurement system with an acoustic detection system. Instead of using pressure sensors and electrical evaluation circuits for each reservoir, acoustic sensors detect the characteristic sounds of the cleaning process, substituting a complex mechanical-electrical system with a simpler acoustic field-based system.
2Ease of operation
If current monitoring of the cleaning valves is used, then the current flow in the valve can be monitored, but no information about the correct cleaning of the filter bag is provided since mechanical failure or lack of compressed air cannot be detected
Solution Approach 1:
The acoustic sensor acts as an intermediary that detects the actual physical outcome of the cleaning process (the cleaning bang sound) rather than just monitoring the electrical current. This intermediary measurement provides direct information about whether the cleaning actually occurred, bridging the gap between valve activation and cleaning effectiveness.
Solution Approach 2:
The acoustic detection system provides feedback about the actual cleaning outcome by detecting the characteristic sound signal. This feedback loop allows the system to verify whether cleaning occurred correctly, enabling identification of malfunctions such as failed cleaning events or improper valve operation.
3Loss of information
If measuring the compressed air flow at the valve supply line is used, then information about the interaction between electrical and pneumatic functions can be obtained, but separate flow measurement and evaluation for each compressed air reservoir is required, resulting in high costs
Solution Approach 1:
The patent replaces flow measurement instruments with acoustic sensors. Instead of measuring compressed air flow rates and requiring separate evaluation systems for each reservoir, the acoustic sensor detects the characteristic sound of the cleaning process, providing a simpler, more cost-effective measurement approach.
Solution Approach 2:
A single acoustic sensor system can monitor multiple valve supply lines and compressed air reservoirs simultaneously, providing universal detection capability. This eliminates the need for separate flow measurement systems for each reservoir, reducing overall system complexity and cost while maintaining comprehensive monitoring.
4Reliability
If a large number of acoustic sensors are installed to monitor all filter bags, then the cleaning process of each filter bag can be detected, but the device complexity and costs increase
Solution Approach 1:
The patent combines the monitoring function for multiple filter bags into a single acoustic sensor system. By strategically positioning acoustic sensors, the system can detect cleaning process sounds from multiple filter bags simultaneously, merging multiple detection functions into fewer sensor units and reducing overall system complexity.
Solution Approach 2:
The patent transitions from a one-to-one mapping (one sensor per filter bag) to a many-to-one relationship (multiple filter bags monitored by one sensor). By utilizing the spatial distribution of filter bags and the propagation of acoustic signals, the system achieves comprehensive monitoring with fewer sensors through dimensional optimization of sensor placement.
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 provides a cost-effective and reliable means to detect the cleaning of each filter, reducing the risk of system failure by accurately identifying correct cleaning and detecting matrix errors, with low-cost acoustic sensors and reduced need for complex evaluations.
Implementation Method 1
a noise is detected by means of locally offset acoustic sensors for detecting airborne sound, which arises during the cleaning of the respective filter
Data Source
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AI summary
The invention relates to a method for detecting a cleaning process in a plant having filters (1, 31) arranged spatially offset from one another, wherein a first gas (21) having solid particles (20) can be conducted in a first flow direction (10) through the respective filter (1, 31) and filtered by means of the respective filter (1, 31). In order to clean the respective filter (1, 31), a second gas (22) can be conducted through the respective filter (1, 31) in a flow direction (11) opposite the first flow direction (10). The invention further relates to a system for detecting a cleaning process in a plant having filters arranged spatially offset from one another for filtering a first gas (21) having solid particles (20), and to such a plant. To be able to detect a cleaning process in a plant of the type mentioned above reliably and cost-effectively, according to the invention a respective noise (12) is detected by means of acoustic sensors (2, 32, 2´, 32´, 42) arranged spatially offset from one another for detecting airborne sound, said noise arising during the cleaning of the respective filter (1, 31). The cleaning of the respective filter (1, 31) is detected in that the respective noise (12) is detected by means of at least two of the acoustic sensors (2, 32, 2´, 32´, 42).