Fumigation Module Activated Carbon Absorption
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Solution Overview
Problem
Current fumigation methods for bulk agricultural products are ineffective in fully eliminating insect infestations and pose significant occupational health and environmental risks due to the release of toxic gases, particularly ozone-depleting substances like methyl bromide.
Innovation Solution
A fumigation apparatus with a module that includes a fumigant inlet, extraction means, and absorption means using activated carbon to absorb the fumigant within the fumigation chamber, preventing escape of toxic gases into the atmosphere, and featuring a control system for safe operation and efficient dispersion of fumigant.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If fumigant is released into the atmosphere after extraction, then the extraction process can be completed, but environmental pollution and occupational health risks occur
Solution Approach 1:
An absorption medium (activated carbon or other absorbent materials) is introduced as an intermediary substance between the fumigant gas and the atmosphere. The absorption medium captures and retains the fumigant molecules, preventing their release into the environment while allowing the extraction process to proceed efficiently.
Solution Approach 2:
The harmful fumigant gas that would normally be released into the atmosphere is converted into a beneficial state by being absorbed and concentrated on the absorption medium. This transforms a harmful waste product into a contained substance that can be safely managed or disposed of.
2Reliability
If heavy impervious blanket is used for covering, then fumigant can be contained, but mixing of gases with bulk materials cannot occur
Solution Approach 1:
Instead of using a static heavy blanket, the system employs dynamic gas circulation through extraction and reintroduction. The fumigant gas is continuously moved and redistributed throughout the bulk material, ensuring thorough penetration and mixing while maintaining containment through controlled extraction.
Solution Approach 2:
The system uses pneumatic principles by utilizing gas flow and pressure differentials to circulate fumigant through the bulk material. Extraction fans create negative pressure that draws fumigant through the material, ensuring deep penetration without requiring heavy physical barriers.
3Ease of operation
If atmospheric venting of fumigant is used, then extraction can be performed, but ozone depletion and environmental damage occur
Solution Approach 1:
An absorption medium serves as an intermediary that intercepts the fumigant gas during extraction. The medium captures the harmful substances before they can reach the atmosphere, allowing the extraction operation to proceed easily while preventing environmental damage.
Solution Approach 2:
The system creates a controlled environment where fumigant is contained and managed rather than released. The absorption medium effectively creates an inert barrier that prevents harmful gases from interacting with the external environment.
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 ensures effective fumigation while minimizing occupational health risks and environmental impact by absorbing nearly all fumigant gases, allowing for faster processing and safer treatment of materials in situ.
Implementation Method 1
absorption means operatively coupled to the extraction means, the absorption means being designed to absorb substantially all of the fumigant extracted from the fumigation chamber
Implementation Method 2
the absorption means comprises an absorption bed including activated carbon to which at least part of the extracted fumigant attaches
Implementation Method 3
the module is adapted to be attached to a source of the fumigant which is directly associated with a heating source, the latter used to convert the fumigant into a gaseous form
Implementation Method 4
The heat energy transferred to the fumigant should be such that it becomes more buoyant than ambient air
Implementation Method 5
the fumigant inlet means includes a dispersion pipe system in use located above the contents of the fumigation chamber. Such an arrangement allows the fumigant, which is generally heavier than air, to fall in a dispersed fashion downward
Implementation Method 6
the module when positioned in use is secure against the passage of fumigant and gases by an inflatable seal which can be inflated for example by means of a compressor fitted to the module
Data Source
AI summary
As shown in FIG. 1 there is one embodiment of a fumigation apparatus in the form of a module (8) including a panel (10) which can be positioned in or at an opening of an enclosed space in use to define a fumigation chamber. Fumigant inlet means in the form of an orifice (12) are arranged in the panel (10) to allow a flow of a fumigant directly into the fumigation chamber. A nominal number of mixing fans, in this case two fans (16) and (18), thoroughly circulate gases within the fumigation chamber when operating. The module (8) includes a system control box (14) linked to the fumigant delivery orifice (12) and valve system which functions to control the flow of toxic gas into the fumigation chamber. The panel (10), when positioned in use, is secure against the passage of fumigant and gases by means of an inflatable rubber seal (22) which is located around a lip edge perimeter of the panel (10). Extraction means for evacuation of the fumigation chamber gases includes a pipe (28) attached to an orifice (30) located in the lower region of the panel (10), the pipe (28) in turn connected to a contra-rotating fan (34) and an actuated butterfly valve (32) and thence to a pipe exhaust stack (36). Absorption means are operatively coupled to the extraction means on the module (8) to absorb at least part of the fumigant extracted from the fumigation chamber. The absorption means is in the form of a removable absorption bed cartridge (40) and includes activated carbon to which the fumigant attaches or is absorbed and is thus stripped from the gas/fumigant extracted from the fumigation chamber.