Movable Soil Chamber Heaters for Uniform Thermal Desorption
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Solution Overview
Problem
Current In-Pile Thermal Desorption (IPTD) techniques face challenges in installing and removing heating systems and gas inlet/vacuum piping within soil volumes without damage, and they can result in uneven heating due to preferential flow through permeable pathways, bypassing lower permeability zones.
Innovation Solution
A soil remediation system with a soil chamber having thermally conductive walls and floors, where heaters are integrated within the walls and floors, and a movable design allowing access for soil loading and unloading vehicles, along with a ventilation system for gas flow and fluid management to ensure even heating and contaminant removal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If heaters are installed within the soil volume for IPTD treatment, then heating effectiveness is improved, but installation complexity and risk of damage during installation and removal increases
Solution Approach 1:
The heating system is segmented into multiple heating zones distributed throughout the soil volume, with each zone containing heaters positioned at strategic locations. This segmentation allows for targeted heating of specific areas while simplifying installation by breaking down the complex task of heating the entire volume into manageable sections.
Solution Approach 2:
Heaters are positioned in three-dimensional space within the soil volume, utilizing vertical and horizontal dimensions to optimize heat distribution. This spatial arrangement ensures comprehensive heating coverage while allowing installation equipment to access heaters from multiple directions, reducing installation complexity.
2Productivity
If gas inlet/vacuum piping is installed within the soil volume, then contaminant removal efficiency is improved, but installation and removal difficulty increases
Solution Approach 1:
The gas inlet and vacuum piping systems are divided into separate, modular components that can be independently installed and positioned within the soil volume. This segmentation allows for easier handling and installation of piping without requiring complex assembly operations, while still achieving comprehensive contaminant removal through distributed gas injection and vacuum extraction points.
Solution Approach 2:
Flexible conduits or distribution manifolds are used as intermediaries to connect the gas inlet and vacuum piping to the treatment zone. These intermediary components facilitate easy installation and removal of the piping system while maintaining effective contaminant removal through proper gas flow distribution.
3Temperature
If heating is applied to contaminated soil, then contaminant vaporization is improved, but uneven heating due to preferential flow through permeable pathways occurs
Solution Approach 1:
The heating system is designed with spatially varying heater power and distribution to account for local differences in soil permeability. Areas with high permeability receive adjusted heating intensity to compensate for preferential gas flow, while low permeability areas receive enhanced heating to ensure adequate contaminant vaporization. This local quality adjustment achieves uniform heating throughout the soil volume despite variations in soil properties.
Solution Approach 2:
Temperature sensors are distributed throughout the soil volume to provide real-time feedback on heating uniformity. This feedback information is used to dynamically adjust heater power and gas flow rates to compensate for preferential flow through permeable pathways, ensuring even heating and complete contaminant removal throughout the treatment zone.
4Productivity
If soil is heated to high temperatures for thermal desorption, then contaminant removal is improved, but treatment time increases
Solution Approach 1:
The thermal desorption process operates continuously with constant heating and gas flow throughout the treatment period. Multiple heating zones operate simultaneously to maintain continuous contaminant vaporization and removal, eliminating idle time and maximizing the efficiency of the treatment process. This continuous operation reduces overall treatment time while achieving complete contaminant removal.
Solution Approach 2:
Gas injection and heating begin simultaneously at the start of treatment, with gas flow established before significant contaminant vaporization occurs. This preliminary gas flow setup ensures that vaporized contaminants are immediately carried away from the heating zones, maintaining the temperature gradient necessary for efficient thermal desorption and reducing the time required to achieve treatment goals.
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 system effectively reduces contaminant levels in soil by achieving uniform heating and allowing for efficient access and operation within the soil chamber, reducing the time and cost of remediation cycles while maintaining structural integrity and operational efficiency.
Implementation Method 1
at least one of the walls at least partially includes a thermally conductive material configured to transfer heat from at least one of the heaters to an interior of the soil chamber
Implementation Method 2
If the soil temperature exceeds a vaporization temperature of a soil contaminant, some or all of the contaminant will vaporize
Data Source
AI summary
Systems for treating contaminated soil are described herein. One system includes a soil chamber that includes one or more walls and at least one floor; at least one heater attached to or inside of at least one of the walls; and at least one heater coupled to or in the floor. Two or more of the walls enclose an interior of the soil chamber. At least one of the walls is configured to move between a closed position during heating of the soil chamber, and an open position that allows a soil moving vehicle to access an interior of the soil chamber to provide or remove soil to and from the soil chamber. At least one wall heater and at least one floor heater provide heat that transfers from the heaters to the contaminated soil in the soil chamber.