Flow Velocity Determination Using Torque Thresholds
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Solution Overview
Problem
Existing methods for determining flow velocity in wastewater treatment plants are hindered by the use of expensive and maintenance-intensive external speed sensors, which are susceptible to disturbances, leading to potential inaccuracies.
Innovation Solution
A method utilizing a control unit to drive a submersible flow generating machine at a nominal speed, then decreasing its rotational speed to detect torque thresholds and determine flow velocity based on a predetermined relationship between rotational speed and flow velocity, eliminating the need for external speed sensors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If external speed sensors are used to determine flow velocity, then measurement precision is improved, but device complexity and maintenance requirements increase
Solution Approach 1:
The flow generating machine serves dual purposes: it generates liquid flow while simultaneously functioning as its own speed sensor. The control unit determines rotational speed by monitoring torque characteristics of the machine itself, eliminating the need for separate external sensors. This self-service approach resolves the contradiction by using the machine's own operational parameters for measurement.
Solution Approach 2:
The flow generating machine is designed to perform multiple functions: liquid circulation and self-monitoring of flow velocity. By integrating speed sensing capability into the machine's torque monitoring system, the same device serves both as the flow generator and the measurement instrument, reducing overall system complexity while maintaining measurement precision.
2Measurement precision
If external speed sensors are used to determine flow velocity, then measurement precision is improved, but reliability deteriorates due to susceptibility to disturbances
Solution Approach 1:
The system uses the flow generating machine's own torque characteristics to determine rotational speed, making the measurement immune to external disturbances that would affect separate sensors. The control unit monitors the machine's intrinsic operational parameters, ensuring reliable measurements even in challenging wastewater treatment environments.
3Measurement precision
If external speed sensors are used to determine flow velocity, then measurement precision is improved, but cost increases
Solution Approach 1:
The flow generating machine monitors its own rotational speed through torque characteristics without requiring additional expensive sensor hardware. The control unit processes the machine's operational data to determine flow velocity, eliminating the need for separate sensor purchases and reducing overall system cost while maintaining measurement precision.
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 allows for accurate determination of flow velocity without external sensors, reducing costs and maintenance while providing reliable operational control within wastewater treatment plants.
Implementation Method 1
a submersible flow generating machine arranged in the circulation channel and configured to generate a liquid flow along the circulation channel
Implementation Method 2
detecting, by means of the control unit, the rotational speed at which the torque of the flow generating machine is equal to a predetermined threshold
Data Source
AI summary
A treatment plant and method for controlling a treatment plant suitable for treatment of wastewater. The treatment plant includes a circulation channel housing liquid, a submersible flow generating machine arranged in the circulation channel and generating a liquid flow along the circulation channel, and a control unit that is operatively connected to the flow generating machine. The flow generating machine is driven in operation by the control unit. The method includes the steps of: driving the flow generating machine at a nominal speed, decreasing the rotational speed of the flow generating machine from the set nominal speed, detecting the rotational speed at which the torque of the flow generating machine is equal to a predetermined threshold, and determining the flow velocity of the liquid at the flow generating machine based on a predetermined relationship between the rotational speed of the flow generating machine and the flow velocity of the liquid.