Exhaust Gas Ageing Test Facility with Insulated Ash Inflow
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Solution Overview
Problem
Current testing facilities for exhaust gas systems lack the ability to simulate the service life of exhaust gas trains effectively, particularly for particulate filters, as they fail to accurately replicate the ageing process in a shortened test period with meaningful results.
Innovation Solution
A testing facility with a burner and separate ash-forming component inflow, allowing for controlled oxidation, combined with exhaust gas recirculation and insulation to achieve a high exhaust gas temperature, simulates the ageing of exhaust gas systems by introducing ash-forming components in a reproducible manner, with precise control over the ash-forming component inflow and combustion parameters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the ash-forming component inflow is guided through insulation to prevent thermal ageing, then the ash-forming component is protected from oxidation, but the burner heat dissipation increases and fuel consumption rises
Solution Approach 1:
The ash-forming component inflow pipe is nested within the insulation layer, creating a protected pathway that isolates the ash-forming component from direct exposure to burner temperatures while maintaining the burner's thermal efficiency. This nested configuration allows the insulation to serve dual purposes: protecting the ash-forming component and maintaining burner heat retention.
Solution Approach 2:
The insulation acts as an intermediary element between the burner and the ash-forming component inflow pipe. It mediates the thermal interaction by allowing heat to be retained in the burner area while preventing excessive heat transfer to the ash-forming component, thus protecting it from thermal ageing without significantly impacting burner efficiency.
2Productivity
If the ash-forming component inflow pipe has a small internal diameter to reduce dead volume, then the flow speed increases and thermal ageing is reduced, but the pipe is more susceptible to thermal stress and oxidation
Solution Approach 1:
The small-diameter ash-forming component inflow pipe is nested within the insulation layer, which protects it from direct thermal exposure. This nested configuration allows the pipe to maintain high flow speed through its small diameter while the insulation provides thermal protection, resolving the contradiction between productivity and reliability.
Solution Approach 2:
The insulation provides preliminary protection to the ash-forming component inflow pipe before thermal stress and oxidation can occur. By pre-isolating the pipe from the burner's thermal environment, the system prevents thermal ageing and structural degradation before they can compromise the pipe's integrity or flow performance.
3Productivity
If the burner operates at high temperature to simulate service life acceleration, then the ageing simulation effectiveness improves, but the fuel consumption increases
Solution Approach 1:
The ash-forming component inflow pipe nested within insulation creates a thermal zone that maintains high temperatures in the burner area for effective ageing simulation while protecting the ash-forming component pathway from excessive heat. This nested structure allows efficient heat utilization for simulation purposes without proportionally increasing fuel consumption.
Solution Approach 2:
The system changes the thermal parameters by introducing insulation that modifies heat distribution. This allows the burner to operate at high temperatures for effective ageing simulation while the insulation prevents unnecessary heat loss, thereby maintaining simulation effectiveness without proportionally increasing fuel consumption.
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 solution enables the simulation of exhaust gas system ageing, particularly for particulate filters, by replicating the effects of engine oil on the filter, ensuring accurate measurement values that reflect the actual service life, while minimizing thermal ageing and fuel consumption.
Implementation Method 1
a burner (5) which has a fuel inflow (2) and a charge air inflow (60), wherein an ash-forming component can be oxidized by means of the burner flame
Implementation Method 2
an ash-forming component inflow (A, B, C), with which an ash-forming component can be oxidized by means of the burner flame
Implementation Method 3
the burner is surrounded at least in some portions by an insulation, and the ash-forming component inflow is guided through the insulation
Implementation Method 4
a coolant inflow is arranged surrounding the ash-forming component inflow at least in some portions
Data Source
AI summary
Testing facility for ageing exhaust gas systems, with a burner (5), a receiving area for receiving at least one catalytic converter (15) and/or a particulate filter (20). An ash-forming component is supplied here to the burner flame.