Gas Engine Heat Pump Exhaust Recirculation Without Extra Power
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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-consuming devices for recirculating exhaust gases.
Innovation Solution
A gas engine heat pump system that recirculates exhaust gases using a first and second charger, with a bypass valve system controlled by a sensor to adjust the recirculation of nitrogen oxide levels, allowing for reduced nitrogen oxide emissions without additional power consumption, while maintaining engine output requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If exhaust gas is recirculated using a separate supercharged blower, then nitrogen oxide emissions are reduced, but power consumption increases
Solution Approach 1:
The patent merges the exhaust gas recirculation function with the existing supercharger system by integrating an exhaust gas recirculation valve into the supercharger's air intake path. This allows exhaust gas to be mixed with fresh air before entering the engine, achieving NOx reduction without requiring a separate power-consuming recirculation device.
Solution Approach 2:
The supercharger system is given multiple functions: it not only compresses fresh air for combustion but also serves as the driving mechanism for exhaust gas recirculation. The single device performs both air charging and exhaust gas recirculation, eliminating the need for additional dedicated recirculation equipment.
2Object-generated harmful factors
If exhaust gas recirculation is implemented, then harmful substance emissions are reduced, but device complexity increases
Solution Approach 1:
The exhaust gas recirculation valve is integrated into the existing supercharger structure, combining two functions (air charging and exhaust recirculation) into a single device. This merger reduces the number of separate components and simplifies the overall system architecture while achieving emission reduction.
3Object-generated harmful factors
If exhaust gas is recirculated to reduce emissions, then nitrogen oxide levels decrease, but engine output may be affected
Solution Approach 1:
The exhaust gas recirculation valve is designed with variable opening degree capability, allowing dynamic adjustment of exhaust gas flow rate based on engine operating conditions. This enables the system to optimize the balance between emission reduction and power maintenance, ensuring engine output requirements are met while achieving NOx reduction.
Solution Approach 2:
The system changes the parameter of exhaust gas recirculation rate dynamically, adjusting the proportion of exhaust gas mixed with fresh air according to engine load and speed. This parameter adjustment allows the engine to maintain optimal performance across different operating conditions while reducing nitrogen oxide emissions.
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
Effectively reduces nitrogen oxide emissions by up to 85.26% while ensuring the engine's output conditions are met, without increasing power consumption, through controlled exhaust gas recirculation and compression.
Implementation Method 1
a first charger which compresses the mixed air and supplies to the engine
Implementation Method 2
a first turbine which is installed in the first exhaust flow path and receives the exhaust gas passing through the first exhaust flow path to drive the first compressor
Implementation Method 3
a second turbine which receives the exhaust gas branched from the first exhaust flow path to the second exhaust flow path and drives the second compressor
Implementation Method 4
a second compressor which compresses the exhaust gas that passed through the first turbine and/or the second turbine and supplies the compressed exhaust gas to the engine
Implementation Method 5
the mixed air may cause a combustion reaction inside the plurality of engine cylinders, and thermal energy generated according to the combustion reaction may be converted into mechanical energy to drive the compressor
Data Source
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.