How does the implementation of an EGR system affect the efficiency and emissions of an ammonia combustion engine?
Best insight from top research papers
The implementation of an Exhaust Gas Recirculation (EGR) system in an ammonia combustion engine can impact efficiency and emissions. EGR systems can reduce NO emissions but may have a negative impact on NO2 and unburned emissions . By incorporating an EGR system, the system pressure drop is reduced, pumping loss work is decreased, and oil consumption is saved, ultimately increasing the EGR rate . Additionally, the EGR impact on ammonia combustion engines can vary, with a positive reduction in NO emissions but potential negative effects on NO2 and unburned emissions . Therefore, while EGR systems can help in reducing certain emissions and improving efficiency, their effects on different pollutants need to be carefully considered in the context of ammonia combustion engines.
Answers from top 5 papers
More filters
| Papers (5) | Insight |
|---|---|
| The implementation of an EGR system in an engine reduces system pressure drop, pumping loss work, oil consumption, and driving pressure difference while increasing the EGR rate, enhancing efficiency, and reducing emissions. | |
3 Citations | Not addressed in the paper. |
39 Citations | Implementing an EGR system in an ammonia combustion engine reduces NO emissions positively but increases NO2 and unburned emissions negatively, impacting efficiency and emissions trade-offs. |
11 Citations | Implementation of an EGR system in an ammonia combustion engine can enhance efficiency by increasing diesel substitution, but may impact emissions by altering combustion mode and increasing NOX emissions. |
| Implementation of an EGR system in an ammonia combustion engine can enhance efficiency by reducing NOX emissions. However, excessive ammonia in exhaust gas may still lead to high emissions. |
Related Questions
What are the most effective emission reduction strategies for ammonia combustion in internal combustion engines?5 answersThe most effective emission reduction strategies for ammonia combustion in internal combustion engines include the utilization of selective catalytic reduction (SCR) technology to reduce nitrogen oxides (NOX) and ammonia emissions. Additionally, mixing hydrogen with ammonia can enhance atomization and combustion performance, leading to lower emissions of soot, CO, HC, and CH2O. Implementing a fueling and combustion control strategy using diesel pilot injection as the ignition source and combustion accelerant can enable high ammonia-diesel substitution ratios to burn efficiently, contributing to reduced greenhouse gas (GHG) emissions. Furthermore, replacing diesel with ammonia in dual-fuel engines can increase indicated thermal efficiency (ITE) and shift combustion mode from diffusion to premixed, although it may lead to increased NOX emissions and unburned ammonia. Overall, these strategies aim to optimize combustion efficiency and minimize emissions for a more sustainable internal combustion engine operation.
How does the efficiency of ammonia combustion with EGR vary with different operating conditions?5 answersThe efficiency of ammonia combustion with Exhaust Gas Recirculation (EGR) varies with different operating conditions. Studies show that ammonia combustion in Compression Ignition (CI) engines with a pilot injection of a higher reactivity fuel achieves combustion stability under various equivalence ratios of NH3-air mixtures, impacting pollutant emissions differently. Additionally, the feasibility of high-pressure dual fuel direct-injection of ammonia in reducing NOx formation has been explored, highlighting the importance of strong interaction between fuels for proper ignition. Numerical simulations suggest that ammonia can effectively operate in heavy-duty engines with up to 50% energy from ammonia, albeit with slightly elevated NO emissions, and the addition of hydrogen can enhance combustion but leads to further NO emissions. Furthermore, a computational investigation on ammonia-hydrogen blends indicates that hydrogen promotes combustion and affects emissions concentrations based on operating conditions. Overall, these findings emphasize the complex interplay between ammonia combustion efficiency, emissions, and operating parameters.
Ammonia fuel ships maritime5 answersAmmonia is considered a potential alternative fuel for decarbonizing the maritime sector due to its high volumetric hydrogen density, low storage pressure, and long-term stability. It has been studied as a dual-fuel option for marine engines, with promising results in terms of engine performance and emissions reduction. The concept of green shipping corridors, where low- and zero-carbon maritime transportation solutions are provided, has been proposed to support the production, distribution, and bunkering of green ammonia. However, the combustion of ammonia in internal combustion engines can produce nitrogen dioxide (NO2) and nitrous oxide (N2O), which are harmful to human health and contribute to greenhouse gas emissions. Fuel cell technology, such as proton exchange membrane fuel cells (PEMFC), solid oxide fuel cells (SOFC), and alkaline fuel cells (AFC), has been explored as a way to eliminate these harmful emissions when using ammonia as a fuel.
Ammonia combustion for heat generation5 answersAmmonia combustion for heat generation has been studied extensively. The combustion characteristics of ammonia have been compared to conventional fuels such as natural gas, dimethyl ether, hydrogen, and syngas. It has been found that ammonia provides inferior combustion characteristics in terms of heat release, stability, and ignition compared to these fuels. However, ammonia can still be used in boilers for heating purposes, although modifications are needed to achieve better NOx control. In gas turbines, combustion of ammonia can lead to higher temperatures compared to other fuels, but at the cost of significant NOx formation. Research has also been conducted on using ammonia as a fuel in gas turbines and coal-fired power plants, with promising results. However, it is important to consider the environmental impacts of using ammonia, as it can result in worse global warming potentials compared to using methane. Further studies are needed to explore methods of reducing emissions and improving combustion efficiency when using ammonia for heat generation.
Ammonia gasoline in SI iengine, combustion analisys2 answersAmmonia can be used as a primary fuel in a gasoline engine, but it requires advanced spark ignition timing for better combustion phasing. However, using large amounts of ammonia can lead to high variation in power output and increased THC emissions. Another study focused on reducing harmful exhaust gases in gasoline engines by using a gasoline additive. The additive consisted of various components such as methanol, isobutyl alcohol, isopropyl alcohol, and octane value improving agents. Additionally, tests were conducted on SI engines using different gaseous fuels. The results showed a correlation between fuel composition and engine operating parameters. The tests included mixtures of methane with hydrogen and LPG with DME, which resulted in lower CO2 emissions and improved engine efficiency. Furthermore, adding syngas to a gasoline engine improved combustion stability and reduced engine out emissions, allowing for wider lean operation limits and ignition retard ranges.
Ammonia as an alternative fuel5 answersAmmonia is being researched as a potential alternative fuel due to its carbon-free nature and potential to reduce greenhouse gas emissions. It is seen as a potential option for internal combustion engines (ICEs) and has been evaluated through numerical experiments and driving cycles to determine its performance and impact on emissions. Ammonia's higher octane number and ability to act as a hydrogen carrier make it an attractive option for carbon-free fuel. Research has shown that ammonia can improve combustion through flash boiling and has different spray characteristics compared to gasoline. In dual fuel engines, replacing diesel with ammonia can increase thermal efficiency and change the combustion mode. However, ammonia combustion can also increase NOX emissions and unburned ammonia, and its use as a fuel must be carefully managed to reduce greenhouse gas emissions. Overall, ammonia shows promise as an alternative fuel, but further research and development are needed to address challenges and optimize its use.