Thermal Desorption Fan Negative Pressure Contaminant Flow
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current thermal desorption machinery for contaminated soil lacks security, safety, and processing efficiency, particularly in maintaining reliable operation and efficient removal of contaminants due to challenges in sealing and managing high temperatures and emissions.
Innovation Solution
A direct contact high temperature thermal desorption device with a desorber, oxidizer, and conveying channel, utilizing a fan to generate negative pressure and move contaminants downstream, enhancing the efficiency and safety of contaminant removal and oxidation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If direct contact high temperature thermal desorption is used to separate contaminants from soil, then processing efficiency and contaminant removal effectiveness are improved, but safety risks and reliability concerns worsen due to high temperature operation and potential explosions
Solution Approach 1:
An inert gas (nitrogen or carbon dioxide) is introduced as an intermediary medium between the heat source and the contaminated soil. The inert gas serves as a heat transfer medium that prevents direct combustion and potential explosions while maintaining high temperature thermal desorption effectiveness. The inert atmosphere acts as a safety buffer that allows efficient contaminant removal without compromising operational safety.
2Productivity
If high temperature is applied to release contaminants from contaminated material, then contaminant removal effectiveness is improved, but energy consumption and operational costs worsen
Solution Approach 1:
The system utilizes the heat generated by the controlled combustion of a portion of the contaminated material or added fuel to maintain the high temperature required for thermal desorption. The inert gas circulates through the system, transferring heat from hotter regions to cooler regions, allowing the process to sustain itself with minimal external energy input. The exothermic oxidation of contaminants also contributes to maintaining process temperature.
Solution Approach 2:
The process exploits phase transitions of contaminants from liquid/solid to vapor phase at elevated temperatures. By heating the contaminated material to temperatures where contaminants volatilize, the system achieves efficient separation. The phase change of water in the soil from liquid to vapor also helps in drying and removing hydrophobic contaminants, improving overall removal effectiveness without requiring excessively high temperatures.
3Object-affected harmful factors
If sealed processing is used to prevent emissions, then environmental safety is improved, but operational complexity and difficulty of managing high temperatures worsen
Solution Approach 1:
The system extracts and removes contaminants from the contaminated soil in vapor phase through the inert gas stream. The contaminated vapor is then separated from the clean inert gas, which is recirculated back to the processing chamber. This extraction approach allows effective emissions control without requiring complete sealing of the entire system, simplifying temperature management and reducing operational complexity.
Solution Approach 2:
The inert gas circulates continuously through the system in a closed loop, repeatedly passing over the contaminated material to maximize contaminant removal efficiency. The continuous circulation ensures consistent temperature distribution and maintains an inert atmosphere throughout the process, preventing emissions while avoiding the need for complex batch processing and repeated sealing operations.
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 device effectively separates contaminants from soil, improving safety and efficiency by ensuring reliable operation and complete contaminant removal, reducing the risk of explosions and emissions, while allowing for on-site remediation of various contaminants.
Implementation Method 1
at least one fan, located between the desorber and the oxidizer, configured to generate negative pressure in the conveying channel between the desorber and the at least one fan in order to move the released contaminants downstream from the desorber
Implementation Method 2
an oxidizer configured to oxidization of at least part of the contaminants
Implementation Method 3
a desorber configured to perform desorption of contaminated material with direct contact in order to release contaminants from the contaminated material
Implementation Method 4
direct contact high temperature thermal desorption
Data Source
AI summary
There is provided a direct contact high temperature thermal desorbtion device (100) for processing contaminated material, comprising: desorbtion means (3) for performing desorbtion of contaminated material with direct contact in order to release contaminants from the contaminated material; oxidizing means (5) for performing oxidization of at least part of the contaminants; channeling means (202) for conveying the released contaminants downstream from the desorbtion means (3) to the oxidizing means (5); and air drafting means (200), located between the desorbtion means (3) and the oxidizing means (5), for generating negative pressure in the channeling means (202) between the desorbtion means (3) and the air drafting means (200) in order to move the released contaminants downstream from the desorbtion means (3).