Ventilated Poultry Stunning Chamber for Gas Gradient Control
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Solution Overview
Problem
Existing stunning apparatuses for poultry slaughter result in unreliable and detrimental stunning due to uncontrolled gas concentration gradients and mixing, leading to inconsistent stunning conditions that compromise animal welfare and meat quality.
Innovation Solution
A ventilation system is integrated into the stunning chamber to circulate stunning medium, forming a barrier between chamber portions with different gas concentrations, ensuring precise control and maintenance of desired gas levels through separate pipe circuits and adjustment mechanisms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If stunning gas is introduced into the stunning chamber from the bottom, then the stunning gas forms a gradient with higher concentration at the bottom, but the gas concentration becomes uncontrolled and mixes unpredictably leading to unreliable stunning
Solution Approach 1:
The stunning chamber is divided into multiple independent zones (first chamber portion with lower gas concentration and second chamber portion with higher gas concentration). Each zone has separate gas introduction and circulation systems, allowing independent control of gas concentrations in each segment. This segmentation prevents uncontrolled mixing while maintaining the required concentration gradient for reliable two-stage stunning.
Solution Approach 2:
A ventilation system acts as an intermediary mechanism between the gas introduction device and the transport containers. This ventilation system circulates the stunning medium in a controlled manner, creating a barrier that prevents direct uncontrolled mixing of gas concentrations. The circulation system mediates the transition between different concentration zones, ensuring predictable and reliable stunning conditions.
2Productivity
If the poultry animals are exposed to high gas concentration directly, then final stunning is achieved quickly, but the animals suffer detrimental effects and meat quality deteriorates
Solution Approach 1:
The ventilation system performs preliminary action by circulating and distributing the stunning medium before the transport containers enter the high-concentration zone. This pre-circulation establishes controlled concentration gradients and ensures that animals are progressively exposed to increasing gas concentrations rather than sudden high-concentration exposure, preventing harmful effects while maintaining efficient stunning.
Solution Approach 2:
Different regions of the stunning chamber are assigned different gas concentrations according to the specific needs of each stunning stage. The first chamber portion maintains lower gas concentration for the calming phase, while the second chamber portion maintains higher concentration for the final stunning phase. This local differentiation of gas quality ensures optimal conditions in each zone without compromising animal welfare or meat quality.
3Device complexity
If the gas concentration gradient is allowed to mix freely, then the chamber is simple in design, but the stunning conditions become inconsistent and unreliable
Solution Approach 1:
The ventilation system provides continuous circulation of the stunning medium throughout the stunning chamber. This continuous action maintains stable concentration gradients in each chamber portion and prevents random mixing that would lead to inconsistent stunning conditions. The ongoing circulation ensures that gas concentrations remain predictable and reliable throughout the stunning process.
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 solution provides consistent and gentle stunning conditions, enhancing animal welfare and improving meat quality by maintaining controlled gas concentrations, thus ensuring reliable and humane stunning processes.
Implementation Method 1
a ventilation system (18) arranged inside the stunning shaft (14) and configured to circulate at least parts of the stunning medium at least in an upper region of the stunning chamber
Implementation Method 2
a device (17), arranged in the region of the bottom (16) of the stunning shaft (14), for introducing stunning gas into the stunning shaft (14) so as to form inside the stunning chamber (12) a stunning medium formed of ambient air and stunning gas
Data Source
AI summary
An apparatus for stunning, in a stunning chamber, poultry animals for slaughter supplied in transport containers, includes a stunning chamber, a transport device for introducing the containers into the chamber, transporting therethrough and discharging therefrom. The stunning chamber has a vertically oriented stunning shaft. The transport device has a lifting device to lower each container into the chamber, top to bottom, on a first transport path. Each container is transported in the stunning shaft bottom region transversely from the first to a second transport path and is lifted, bottom to top, on the second path. A device in the shaft bottom region introduces stunning gas into the shaft to form inside the stunning chamber a stunning medium of ambient air and stunning gas. A ventilation system inside the stunning shaft circulates parts of the stunning medium in an upper region of the chamber. A method is also provided.