Livestock Stall Manure Cooling and Odor Control
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Solution Overview
Problem
Current stable buildings for farm animals, particularly pigs, face challenges in effectively reducing odor nuisance and environmental pollution, especially in low-wind inland areas with high population densities, despite existing ventilation systems and manure cooling measures, which are not sufficient to protect nearby residents and workers from significant odor and dust exposure.
Innovation Solution
The stable building incorporates pipeline loops connected to a cooling unit that cools manure to inhibit decomposition, combined with a ventilation system featuring an exhaust air cleaning stage to remove odors, ammonia, and dust, and a clearing device with a folding slide for efficient manure removal, along with a heat recovery system for partial heating and a biogas plant for energy generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If ventilation systems are used to extract odorous substances, ammonia and dust from stable air, then air quality is improved, but fan power requirements and energy consumption increase
Solution Approach 1:
The cooling unit is applied to cool the manure before it decomposes and releases odorous substances and ammonia. By performing the cooling action in advance, the subsequent ventilation system requires less power to remove emissions, as the source of these emissions is suppressed beforehand.
Solution Approach 2:
The cooling unit converts the harmful warm manure into a beneficial cooled state that inhibits decomposition. The waste heat from the manure cooling process is recovered and used to pre-heat fresh air or heat water, turning a potentially harmful thermal effect into a useful energy resource that reduces overall energy consumption.
2Object-generated harmful factors
If manure cooling is implemented to inhibit decomposition and reduce emissions, then odor nuisance is reduced, but additional equipment and maintenance effort are required
Solution Approach 1:
The cooling unit serves multiple functions: it cools the manure to inhibit decomposition, recovers waste heat for heating purposes, and reduces the load on the ventilation system. This multi-functionality justifies the additional equipment by providing multiple benefits rather than a single purpose.
Solution Approach 2:
The system uses the heat from the manure itself to cool it down through heat exchange, and the recovered heat is used to heat fresh air or water. The system essentially uses its own thermal energy to achieve cooling and heating functions, reducing the need for external energy sources.
3Productivity
If mechanical manure removal via spreader blade is used, then manure clearing efficiency is improved, but pumpability and flowability requirements create operational constraints
Solution Approach 1:
The cooling of manure changes its physical parameters, specifically its temperature and viscosity characteristics. Cooled manure has different flow properties that can affect its pumpability and handling characteristics, allowing the mechanical spreader blade to operate more effectively without excessive flowability constraints.
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
This combination significantly reduces fan power requirements, lowers maintenance costs, improves air quality, and enhances energy balance by reducing odor emissions and dust, while providing a reliable and efficient handling of manure and roughage, thus addressing the limitations of existing technologies.
Implementation Method 1
the manure collecting plate is traversed by pipeline loops which are connected to at least one cooling unit, and that the cooling unit in conjunction with the clearing device is used to cool the manure down to a temperature that inhibits the outgassing of the excrement and bacterial decomposition activities
Implementation Method 2
The cooling unit is preferably part of a heat recovery system, with which heat extracted from the manure collecting plate can be used for partial heating of individual stable areas
Implementation Method 3
The cooling unit, because of the cooling effect of the ventilation system, a significantly lower cooling capacity is required
Implementation Method 4
the ventilation system, on the other hand, is used to remove odours, ammonia and dust from inside the barn and to cool the barn air by exchanging warmer exhaust air for cooler fresh air
Implementation Method 5
The exhaust air cleaning stage serves to separate odorous substances, ammonia and dust from the barn air to be discharged into the open air
Data Source
Figure 1
Figure 2
AI summary
The building has a muck cellar (2) comprising a muck collecting plate (1), and a set of holding bays (4) separated from the muck cellar over an intermediate ceiling. The intermediate ceiling comprises a gap bottom (5), and the muck collecting plate runs through pipeline loops (6) that are attached to a refrigerator. The muck collecting plate is attached to a clearing device and a ventilation system (9). The ventilation system comprises an exhaust air purification stage (12), and the clearing device comprises a folding slider. A muck conveyer (17) comprises an electric drive. The electric drive is designed as a regular electromotor.