Exhaust Gas Dilution Device Thermal Separation
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Solution Overview
Problem
Conventional exhaust gas dilution devices fail to maintain the temperature of dilution gas at a predetermined level due to heat transfer from the exhaust gas circulation pipe, affecting the accuracy of analysis results.
Innovation Solution
The exhaust gas dilution device features a dilution gas supply pipe arranged spatially apart from the exhaust gas circulation pipe until reaching a mixing section with an orifice, along with multiple dilution gas supply pipes and a heat dissipation mechanism, to prevent temperature rise and ensure uniform dilution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the dilution gas supply pipe contacts or passes near the exhaust gas circulation pipe to supply dilution gas to the mixing section, then the device structure is simplified and easier to install, but the temperature of the dilution gas rises due to heat transfer from the exhaust gas, affecting mixing precision and analysis accuracy
Solution Approach 1:
The dilution gas supply pipe is extracted from the vicinity of the exhaust gas circulation pipe and relocated to a position spaced apart from it. This separation removes the harmful thermal influence while maintaining the functional integrity of the dilution gas supply system, thereby preventing temperature rise without significantly complicating the overall device structure
Solution Approach 2:
The patent introduces an intermediary spatial arrangement where the dilution gas supply pipe passes through a space that is neither in direct contact with nor immediately adjacent to the exhaust gas circulation pipe. This intermediary positioning acts as a thermal buffer, allowing the dilution gas to be supplied without direct heat transfer while still maintaining system compactness
2Volume of moving object
If the dilution gas is supplied close to the exhaust gas circulation pipe, then the mixing section can be compactly designed, but the temperature of the dilution gas increases due to thermal radiation and conduction from the exhaust gas pipe
Solution Approach 1:
The patent resolves the spatial conflict by utilizing three-dimensional spatial arrangement rather than simple linear proximity. The dilution gas supply pipe is positioned in a different spatial dimension or plane relative to the exhaust gas circulation pipe, allowing the mixing section to remain compact while maintaining sufficient thermal separation through clever geometric configuration
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 arrangement effectively controls the temperature of the exhaust gas after dilution, enhancing the accuracy of analysis results by maintaining the dilution gas temperature and ensuring uniform mixing.
Implementation Method 1
a temperature of the dilution gas rises because the dilution gas is affected from the temperature of the exhaust gas through the exhaust gas circulation pipe, or through the exhaust gas circulation pipe and the dilution gas supply pipe
Implementation Method 2
the exhaust gas is diluted by mixing the dilution gas to be supplied to the dilution gas supply pipe at a predetermined ratio in a mixing section arranged on the exhaust gas circulation pipe
Data Source
AI summary
An exhaust gas dilution device 1 is to prevent a temperature of dilution gas from being raised under the influence of the temperature of the exhaust gas before the dilution gas is mixed with the exhaust gas. The exhaust gas dilution device 1 comprises an exhaust gas circulation pipe 101 to circulate the exhaust gas G, a mixing section 102 that is arranged in the exhaust gas circulation pipe 101 and that has an orifice 17, and a dilution gas supply pipe 14 that opens at the mixing section 102 and that supplies dilution gas W to the exhaust gas circulation pipe 101. The dilution gas supply pipe 14 is arranged spaced apart from the exhaust gas circulation pipe 101 until it reaches the mixing section 102.