Dual EGR Path Arrangement for Liquid Droplet Management
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing exhaust gas recirculation (EGR) arrangements in power systems face challenges in managing liquid droplets, which can impair intake system components, and require large pressure differences that negatively affect engine efficiency.
Innovation Solution
The implementation of a dual exhaust gas recirculation path system with a flow controller, allowing for selective control of exhaust gas flow based on operating conditions, and a liquid separator with different liquid removal capabilities for each path.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a condensation separation apparatus is used to separate moisture from exhaust gas, then liquid droplet damage is reduced, but a large pressure difference is required which negatively affects engine efficiency
Solution Approach 1:
The exhaust gas recirculation system is divided into multiple separate paths (first EGR path and second EGR path), each with different liquid removal capabilities. This segmentation allows selective routing of exhaust gas based on operating conditions, enabling liquid separation when needed without continuously incurring the energy penalty of large pressure differences.
Solution Approach 2:
The system dynamically switches between different EGR paths based on operating conditions such as engine load, temperature, and liquid content requirements. A control unit monitors these conditions and directs exhaust gas through the appropriate path, making the liquid removal capability adaptive rather than static, thus avoiding unnecessary energy loss during operations where liquid separation is not required.
2Object-generated harmful factors
If exhaust gas is recirculated downstream of the turbocharger, then NOx emissions are reduced, but liquid droplets may form and impair the intake system
Solution Approach 1:
The system introduces an intermediary control mechanism (control unit and flow controllers) that mediates between the benefit of downstream EGR for NOx reduction and the risk of liquid droplet formation. By selectively activating liquid separation only when liquid droplet risk is detected or anticipated, the system uses the intermediary control system to balance emission reduction with intake system protection.
Solution Approach 2:
Different segments of the EGR system are assigned different functions: one path is optimized for liquid removal while another maintains simple recirculation for NOx reduction. This local differentiation allows the system to apply liquid separation only in the specific context where it is needed, rather than uniformly across all EGR operations.
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 effectively mitigates the damage from liquid droplets while maintaining engine efficiency by allowing appropriate exhaust gas recirculation paths to be used depending on operating conditions.
Implementation Method 1
a liquid separator (40) comprising a first (42) and a second (44) gas outlet, the first gas outlet being in fluid communication with the first exhaust gas recirculation path and the second gas outlet being in fluid communication with the second exhaust gas recirculation path
Implementation Method 2
the first exhaust gas recirculation path is associated with a first liquid removal capability and the second exhaust gas recirculation path is associated with a second liquid removal capability
Data Source
Figure 1
Figure 2~3
Figure 4~5
AI summary
The present disclosure relates to an exhaust gas recirculation arrangement (22) for a power system (12), said power system (12) comprising an internal combustion engine (14), an exhaust gas system (16) and an intake system (18) comprising an inlet air compressor (20), said exhaust gas recirculation arrangement (22) comprising a first exhaust gas recirculation path (24) and a second exhaust gas recirculation path (26) for recirculating exhaust gas from said exhaust gas system (16) to said intake system (18), characterized in that the first and second exhaust gas recirculation paths are adapted to recirculate exhaust gas to the same side of said inlet air compressor (20), in an intended direction of flow of inlet air in said power system (12), wherein said exhaust gas recirculation arrangement (22) comprises a flow controller, preferably said flow controller comprises a valve connected to said second exhaust gas recirculation path (26), for controlling the flow volume through at least one of said first and second exhaust gas recirculation paths (24, 26).