Exhaust-Driven EGR Compression in Gas Engine Heat Pumps
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Solution Overview
Problem
Gas engine heat pumps face challenges in reducing nitrogen oxide emissions in exhaust gases without increasing power consumption, as existing solutions require additional power for recirculating exhaust gases.
Innovation Solution
The implementation of a gas engine heat pump system that includes a first charger for compressing mixed air and a second charger driven by exhaust gas to recirculate compressed exhaust gases back into the engine, with bypass valves and sensors to adjust the recirculation based on nitrogen oxide concentration and output requirements, allowing for reduced nitrogen oxide emissions without additional power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If exhaust gas is recirculated to the engine using a separate supercharged blower, then nitrogen oxide emission is reduced, but power consumption increases
Solution Approach 1:
The patent merges the exhaust gas recirculation function with the existing supercharging system by integrating a recirculation line that taps into the supercharger's compressed air flow. Instead of using a separate power-consuming blower, the system utilizes the already-compressed air from the supercharger to transport exhaust gas back to the engine, thereby reducing NOx emissions without additional power consumption.
Solution Approach 2:
The supercharging system serves dual purposes: both compressing intake air for combustion and providing the medium for exhaust gas recirculation. The compressed air from the supercharger automatically performs the recirculation function without requiring external power input, making the system self-sufficient for both supercharging and emissions control.
2Object-generated harmful factors
If exhaust gas recirculation is implemented, then harmful substance emission is reduced, but device complexity increases due to additional components
Solution Approach 1:
The patent combines the exhaust gas recirculation system with the existing supercharger infrastructure. The recirculation line is integrated into the supercharger's air flow path, and the control valve is incorporated into the existing engine management system. This merging approach enables emissions control without adding significant complexity to the overall system architecture.
Solution Approach 2:
The supercharger is designed to perform multiple functions: compressing intake air for combustion and facilitating exhaust gas recirculation. By making the supercharger a multi-functional component, the system achieves emissions reduction without requiring dedicated single-purpose components, thereby minimizing device complexity.
3Object-generated harmful factors
If exhaust gas is recirculated to reduce nitrogen oxide, then emission control is improved, but engine output may be affected
Solution Approach 1:
The patent implements a controllable recirculation system with a valve that can dynamically adjust the amount of exhaust gas recirculated based on engine operating conditions. The control system monitors engine parameters and modulates the recirculation flow to maintain optimal balance between emissions control and engine performance, ensuring that power output requirements are met while reducing NOx emissions.
Solution Approach 2:
The system incorporates feedback control mechanisms that monitor engine output and emissions parameters, then adjust the exhaust gas recirculation rate accordingly. This closed-loop control ensures that the engine maintains required power output while achieving effective nitrogen oxide reduction through optimized recirculation timing and quantity.
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 approach effectively reduces nitrogen oxide emissions by up to 85.26% while maintaining engine output requirements without increasing power consumption, demonstrating a significant environmental and operational benefit.
Implementation Method 1
a first charger which compresses the mixed air and supplies to the engine
Implementation Method 2
a second charger which is driven by the exhaust gas branched from the first exhaust flow path to a second exhaust flow path, and compresses the exhaust gas discharged from the engine and supplies the compressed exhaust gas to the engine
Implementation Method 3
an engine which burns a mixed air of air and fuel
Data Source
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AI summary
The present disclosure relates to a gas engine heat pump including: an engine which burns a mixed air of air and fuel; a first charger which compresses the mixed air and supplies to the engine; a first exhaust flow path which is connected to the engine, and through which exhaust gas discharged from the engine flows; and a second charger which is driven by the exhaust gas branched from the first exhaust flow path to a second exhaust flow path, and compresses the exhaust gas discharged from the engine and supplies the compressed exhaust gas to the engine, thereby reducing the emission of nitrogen oxide by recirculating the exhaust gas without additional power consumption.