Urea Quality Sensor Using Acoustic and Conductivity Measurements
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Solution Overview
Problem
Current urea solution quality monitoring devices are not sensitive or accurate enough to distinguish between different grades of urea solutions, such as agricultural-grade and industrial-grade urea, due to trace metal salts, and are not representative of the overall quality within a tank, leading to potential contamination and SCR system failures.
Innovation Solution
A quality sensor apparatus with a configuration of sensors measuring mechanical and electrical properties, including acoustic and conductivity sensors, and a data processing arrangement to generate output data indicative of the urea solution's quality, providing accurate and reliable measurements of urea solution quality within a tank.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional sensors are used to measure urea solution quality, then device complexity is reduced, but measurement precision is insufficient to distinguish between different grades of urea solutions
Solution Approach 1:
The measurement system is segmented into multiple independent sensors, each measuring a specific property (acoustic velocity, electrical conductivity, temperature). This segmentation allows each sensor to be optimized for its specific measurement task while collectively providing comprehensive quality assessment that distinguishes between different urea solution grades.
Solution Approach 2:
The invention measures multiple physical parameters (acoustic velocity, electrical conductivity, temperature) simultaneously to characterize urea solution quality. By monitoring changes in these parameters and their relationships, the system can detect trace metal salts and distinguish between agricultural-grade and industrial-grade urea solutions with high precision.
2Reliability
If a single-point measurement is taken in the urea tank, then device complexity is minimized, but the measurement is not representative of the overall quality within the tank
Solution Approach 1:
The measurement system transitions from a single-point measurement to a distributed spatial measurement by placing sensors at multiple locations within the tank. This dimensional expansion ensures that the measurements represent the overall quality of the urea solution throughout the tank, accounting for potential spatial variations in composition and contaminants.
3Loss of substance
If agricultural-grade urea is used to reduce costs, then loss of substance is reduced, but contaminants poison the SCR catalyst and cause system failure
Solution Approach 1:
The quality sensor apparatus performs preliminary detection of urea solution quality before the solution is used in the SCR system. By measuring acoustic velocity, electrical conductivity, and temperature to detect trace metal salts and distinguish between urea grades, the system identifies contaminated solution in advance, preventing catalyst poisoning and system failure before they occur.
Solution Approach 2:
The system establishes a feedback loop where quality measurements are continuously monitored and used to control urea solution dispensing. When contaminants or incorrect urea grades are detected, the system可以提供 alerts and control signals to prevent the contaminated solution from reaching the SCR catalyst, thereby protecting the system while allowing cost-effective operation with proper quality control.
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
The apparatus effectively measures urea solution quality with enhanced accuracy and reliability, distinguishing between different grades and detecting contaminants, thereby preventing SCR system failures and ensuring compliance with emission regulations.
Implementation Method 1
measuring a velocity of acoustic radiation propagation through a representative spatial region of the solution
Implementation Method 2
measuring electrical conductivity properties within a representative spatial region of the solution
Data Source
AI summary
An apparatus (100) for measuring quality of a urea solution is operated with at least a portion of the apparatus inserted into the urea solution. The apparatus (100) includes a configuration of sensors (180, 190, 200) for measuring mechanical and electrical properties within a volume of the urea solution, the measurements of mechanical and electrical properties being mutually differently influenced by components present in the urea solution. A data processing arrangement (230) of the apparatus (100) is operable to process the measurements of mechanical and electrical properties for generating output data (120) indicative of a quality of the urea solution. The apparatus (100) is also capable of being adapted to measure qualities of other types of solution.