Integrated Flame-Arrester Oxidizing Device for Exhaust Systems
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing explosion proof exhaust systems for internal combustion engines are complex, require frequent maintenance due to particulate buildup, and are inefficient in reducing pollutants and preventing ignition of flammable gases.
Innovation Solution
An integrated flame-arrester-oxidizing device with a duct coated in noble metals, an insulator layer, and a dry cooling system that maintains elevated internal temperatures for oxidation of pollutants, reducing the need for frequent cleaning and maintenance, while also incorporating a compact design for space-constrained applications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a traditional cooling unit with large dimensions is used to reduce exhaust temperature, then the external surface temperature is reduced, but the device complexity and space requirements increase
Solution Approach 1:
The patent combines the cooling unit, flame arresting unit, and spark arresting unit into a single integrated exhaust system. The cooling radiators are integrated with the flame arrester structure, allowing simultaneous temperature reduction and flame containment without requiring separate large-dimensional units for each function.
Solution Approach 2:
The integrated exhaust system performs multiple functions simultaneously: cooling the exhaust gases, arresting flames, capturing sparks, and filtering particulates. This multi-functional design reduces the overall device complexity compared to traditional separate units while achieving the same temperature reduction effect.
2Reliability
If a flame arresting unit is used to prevent ignition, then flame propagation is stopped, but frequent cleaning and maintenance are required due to particulate buildup
Solution Approach 1:
The exhaust system is divided into distinct functional sections: cooling radiators, flame arrester, spark arrester, and particulate filter. This segmentation allows the flame arresting function to be separated from the particulate collection function, so that particulate buildup in the filter does not directly impact flame arrestion performance, reducing the frequency of flame arrester cleaning.
Solution Approach 2:
A separate particulate filtering system is introduced as an intermediary component between the flame arrester and the exhaust outlet. This mediator captures particulates before they can accumulate on the flame arresting surfaces, thereby maintaining flame arrestion effectiveness without requiring frequent cleaning of the flame arrester itself.
3Reliability
If separate spark arresting and flame arresting units are used, then comprehensive protection is achieved, but the system complexity increases
Solution Approach 1:
The patent merges the spark arresting unit and flame arresting unit into a single integrated structure. The spark arrester is positioned within or adjacent to the flame arrester, allowing both functions to be achieved in one compact assembly rather than requiring separate units, thus reducing overall system complexity while maintaining comprehensive explosion protection.
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 system effectively reduces pollutants by 90% for carbon monoxide, 70% for hydrocarbons, 35% for nitrogen oxides, and 40% for diesel particulate matter, with minimal engine back pressure impact, and eliminates the need for frequent maintenance, enhancing operational efficiency and safety in potentially explosive environments.
Implementation Method 1
An oxidizing and filtering device comprising metal foils coated by a noble metal (e.g., platinum, or the like) is firmly and securely affixed across the passageway
Implementation Method 2
the exhaust fumes and pollutants from the engine, passing through and along the metal foils, are oxidized resulting in mostly water vapour and gases being emitted
Implementation Method 3
an insulator layer is mounted over the external wall of the duct... the insulator layer insures that the coolant does not lower the temperature within the duct's passageway to a value which would prevent oxidation
Implementation Method 4
A jacket is mounted over the insulator through which a coolant (water or the like) can pass to cool the external surface of the system, in contact with the atmosphere
Data Source
Figure 1
Figure 2
Figure 3
AI summary
The exhaust system of an an internal combustion engine includes a duct having an input end coupled to the engine for passing and processing the exhaust gases and fumes emitted by the engine such that the duct functions as an anti-explosion and fire arrester device. The duct includes a reenforced filter structure (3) securely and firmly mounted within and across the duct opening. The filter structure (3) is coated with a noble metal to enhance oxidation of the gases and fumes passing through the duct. An insulator layer (303) is attached about and along the outer surface of the duct and a jacket (305) for carrying a coolant is mounted - above and about the insulator layer. The insulator layer (303) isolates the coolant from the duct to ensure that the temperature on the external side of the jacket is less than a predetermined value. Simultaneously, the insulator layer isolates the duct from the coolant to enable the temperature within the duct to have a sufficiently high value to sustain oxidation of the gases and fumes.