Mobile Ventilation Stack Assembly for Safe Fumigant Dispersion
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Solution Overview
Problem
Existing fumigation methods using toxic fumigants pose health and environmental risks due to incomplete removal and potential leaks, necessitating the development of devices and methods to capture, dilute, and disperse fumigants safely.
Innovation Solution
A ventilation stack assembly comprising a tubular stack connected to pipes, secured within a modified shipping container housing, which vents fumigants to a high altitude for dispersion, utilizing ballast and guy wires for stability, and incorporates gas-moving equipment for enhanced gas flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If fumigants are used to treat organisms within shipping containers, then the effectiveness of killing or inactivating undesirable organisms is improved, but health and environmental risks increase due to potential leaks and incomplete removal
Solution Approach 1:
The patent introduces a ventilation stack assembly as an intermediary device between the fumigation enclosure and the environment. This stack captures fumigant gases that escape during or after fumigation and channels them through a controlled path to a safe discharge location, preventing direct release into the environment and reducing health risks to workers and nearby populations.
Solution Approach 2:
The ventilation stack extracts harmful fumigant gases from the fumigation enclosure and removes them from the immediate operational area. By capturing and transporting these gases away from the container and surrounding areas, the system separates the harmful substance from vulnerable targets, thereby reducing exposure risks.
2Reliability
If fumigants are retained within an enclosed area for a predetermined period, then the effectiveness of organism treatment is improved, but the risk of human exposure to the fumigant increases
Solution Approach 1:
The ventilation stack serves as a continuous intermediary pathway that operates throughout the fumigation process. It provides a controlled escape route for fumigant gases, allowing the enclosure to remain sealed for effective treatment while simultaneously preventing pressure buildup and reducing the concentration of gases that might leak through seals or gaps.
Solution Approach 2:
The system implements a form of feedback by continuously monitoring and responding to fumigant gas accumulation. The ventilation stack automatically captures and removes gases as they are generated or escape, creating a negative feedback loop that prevents excessive pressure and concentration buildup, thereby reducing the risk of catastrophic seal failure and human exposure.
3Object-affected harmful factors
If a ventilation stack assembly is used to disperse fumigants, then human exposure and environmental impact are reduced, but device complexity increases
Solution Approach 1:
The ventilation stack assembly is designed to perform multiple functions: it captures fumigant gases, channels them away from the container, disperses them at a safe location, and prevents pressure buildup within the enclosure. By consolidating these functions into a single integrated structure, the system reduces overall complexity compared to having separate devices for each function.
Solution Approach 2:
The ventilation stack is designed to operate autonomously during the fumigation process. Once installed and connected to the enclosure, it self-regulates the flow of fumigant gases based on pressure differentials and flow dynamics, requiring minimal active control or monitoring. This self-service capability reduces the operational complexity and human intervention needed.
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
Effectively captures and disperses fumigants above hazardous levels, reducing human exposure and environmental impact by ensuring complete venting and compliance with safety regulations.
Implementation Method 1
The stack is configured to vent the fumigant to a high altitude where the fumigant can disperse
Implementation Method 2
gas-moving equipment associated with, or included within, the stack or pipe to induce gas movement therethrough
Data Source
AI summary
The disclosure relates to devices and methods for ventilating enclosed area such as shipping containers or structures erected to temporarily contain cargo items. A central element in such devices and methods is a ventilation stack assembly in which a vertically-oriented stack having an outlet is connected at its other end to a pipe leading to an inlet. A first housing having the dimensions (and preferably the fittings) of a standard shipping container is rigidly connected to the stack and pipes, and the assembly can be physically manipulated as if it were a standard shipping container. Gas (e.g., fumigant) provided to the pipe inlet passes through the pipe and IO into and through the stack, exiting at the outlet, which can be situated at an altitude whereat gas discharged therefrom is dispersed into the atmosphere at a location and concentration at which displeasure or hazard to humans can be reduced.