Recycled Asphalt Moisture Control for Process Stability
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Solution Overview
Problem
The addition of recycled asphalt granules in asphalt production is limited due to moisture content variations, affecting process reliability and quality, and existing methods are complex and inefficient.
Innovation Solution
Measuring the moisture content of recycled asphalt granules and controlling their supply to maintain a permissible level, ensuring they are added to the mixing device in a controlled manner to prevent explosive water vapor generation, thereby ensuring process stability and quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If the addition quantity of recycled asphalt granules is increased to reduce costs and CO2 emissions, then the proportion of raw asphalt granules is reduced, but the process reliability and quality are impaired due to moisture content variations and explosive water vapor generation
Solution Approach 1:
The system continuously monitors moisture content as a critical parameter and adjusts the addition quantity of recycled asphalt granules dynamically based on measured moisture levels. This parameter-based control enables higher utilization of recycled material while maintaining process reliability by adapting to varying moisture conditions in real-time
Solution Approach 2:
A feedback control system is implemented where moisture content sensors continuously measure the moisture level of recycled asphalt granules, and this information is used to automatically adjust the addition quantity. The feedback loop ensures that the permissible upper moisture limit is not exceeded, preventing explosive water vapor generation while maximizing recycled material usage
2Loss of substance
If the addition quantity of recycled asphalt granules is increased, then costs and CO2 emissions are reduced, but explosive water vapor generation exceeds permissible maximum amounts
Solution Approach 1:
The moisture content of recycled asphalt granules is measured before addition to the mixing device, and based on this preliminary measurement, the addition quantity is predetermined to ensure that the resulting water vapor does not exceed permissible maximum amounts. This preliminary control prevents explosive water vapor generation while maximizing recycled material usage
Solution Approach 2:
The system takes preliminary anti-action by measuring moisture content and controlling the addition quantity in advance, preventing the harmful effect of explosive water vapor generation before it occurs. The control system ensures that the combination of recycled granule moisture and addition quantity never results in excessive water vapor that could cause explosions
3Manufacturing precision
If existing methods for controlling recycled asphalt granule addition are used, then quality is maintained, but the processes are complex and inefficient
Solution Approach 1:
The system performs self-service by automatically measuring moisture content, determining permissible addition quantities, and controlling the addition process without requiring complex external control systems. The self-contained measurement and control approach maintains quality while simplifying the overall process complexity
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 a higher proportion of recycled asphalt granules to be used, reducing costs and CO2 emissions while maintaining process reliability and quality, and preventing potential explosions.
Implementation Method 1
A moisture content of the old asphalt granules provided is measured with at least one moisture sensor
Implementation Method 2
a mixture of aggregates and binder is introduced into a mixing chamber and indirectly heated and mixed there
Implementation Method 3
The increase in pressure in the mixing device caused by the formation of water vapor
Data Source
Figure 1
AI summary
A process for producing asphalt comprises the process steps of providing recycled asphalt granules (3), measuring the moisture content of the provided recycled asphalt granules (3) using at least one moisture sensor (10), determining a permissible feed quantity of recycled asphalt granules (3) depending on the measured moisture content of the recycled asphalt granules (3), feeding the permissible feed quantity of recycled asphalt granules (3) to a mixing device (15) and mixing the fed recycled asphalt granules (3) with raw asphalt granules in the mixing device (3).