Exhaust Gas Extraction Apparatus With Peripheral Discharge
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Solution Overview
Problem
Existing exhaust gas extraction systems face limitations in efficiently capturing and cooling exhaust gases from internal combustion engines, leading to hazardous working conditions and potential heat damage to equipment, due to inadequate mixing and cooling within the extraction apparatus.
Innovation Solution
The system incorporates a multi-flow path design where air, exhaust gas, and water converge for effective dilution and cooling, with water injection into the air flow and exhaust gas paths, and heat exchange mechanisms to manage temperature and prevent heat damage to equipment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a centrally located discharge section is used in the flow passage, then exhaust gas can be delivered into the flow path for mixing with air, but the discharge section restricts the volume of exhaust gas that can be handled and creates negative pressure at the engine exhaust
Solution Approach 1:
The invention extracts the discharge section from the central location and relocates it to the periphery of the flow passage. This removes the obstructing element from the center, allowing the full cross-sectional area of the flow passage to be utilized for exhaust gas handling, thereby resolving the contradiction between ease of mixing and volume capacity.
Solution Approach 2:
The discharge section is repositioned from a central axial location to a peripheral location in the flow passage. This spatial reconfiguration in another dimension allows the exhaust gas to be introduced at the periphery rather than blocking the central flow path, eliminating the negative pressure effect while maintaining mixing capability.
2Productivity
If exhaust gas is delivered into the flow path for mixing with air, then dilution of exhaust gas is achieved, but inadequate mixing occurs and hot spots form in the suction line
Solution Approach 1:
The invention introduces water injection nozzles at specific locations within the flow passage to enhance mixing quality locally. By applying water injection at strategic points, the system achieves better mixing of exhaust gas with air and water, preventing hot spots in the suction line while maintaining extraction efficiency.
Solution Approach 2:
Water is introduced as an intermediary substance to facilitate mixing between exhaust gas and air. The water acts as a medium that enhances the mixing process and prevents the formation of hot spots, thereby improving reliability without compromising productivity.
3Temperature
If water is injected into the air flow for cooling, then cooling effect on exhaust gas is improved, but the system complexity increases
Solution Approach 1:
The invention merges the water injection function with the existing air flow system by integrating water injection nozzles into the flow passage structure. This combination allows cooling functionality to be added without requiring a completely separate complex system, as water injection is incorporated into the existing air handling pathway.
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 design enhances the extraction and cooling of exhaust gases, ensuring safe handling and reducing the risk of heat damage to equipment, while improving working conditions by effectively diluting and cooling the gases before conveyance.
Implementation Method 1
the third flow path being in heat exchange relation with the first flow path whereby water flow in the third flow path provides a cooling effect on the fluid mixture, the third flow path further being in heat exchange relation with the second flow path whereby water flow in the third flow path provides a cooling effect on exhaust gas flow along the second flow path
Implementation Method 2
the first flow path being in heat exchange relation with the second flow path whereby flow along the first flow path provides a cooling effect on exhaust gas flow along the second flow path
Implementation Method 3
a third flow path for delivery of water for mixing with the air flow whereby there is confluence of air, exhaust gas and water to provide a fluid mixture for discharging through the outlet
Data Source
AI summary
An extraction apparatus (10) adapted to capture exhaust gas emitted by an internal combustion engine and to dilute the exhaust gas by mixing with air and also cool the exhaust gas. The extraction apparatus (10) has a first flow path (31), second flow path (32), and third flow path (33). The first flow path (31) extends between inlet (35) and an outlet (37) for air flow from the inlet to the outlet. The second flow path (32) receives exhaust gas emitted from the engine and delivers it into the first flow path (31) for mixing with an air flow along the first flow path. The third flow path (33) delivers water for mixing with the air flow. The arrangement is such that there is confluence of air, exhaust gas and water to provide a fluid mixture for discharging through the outlet (37). The exhaust gas is cooled using the cooling effects of the air and also the cooling effects of water in heat exchange relation with the exhaust gas prior to mixing of the exhaust gas with the air. There is also cooling of the mixture of exhaust gas and air using the cooling effects of water in heat exchange relation with the mixture, and also cooling by injection of water into the air. The various flow paths are configured for the requisite heat exchange relation.