Effect of Selective Non-Catalytic Reduction Reaction on the Combustion and Emission Performance of In-Cylinder Direct Injection Diesel/Ammonia Dual Fuel Engines
Ammonia, as a hydrogen carrier and an ideal zero-carbon fuel, can be liquefied and stored under ambient temperature and pressure. Its application in internal combustion engines holds significant potential for promoting low-carbon emissions. However, due to its unique physicochemical properties, ammo...
Saved in:
| Main Authors: | , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2025-01-01
|
| Series: | Energies |
| Subjects: | |
| Online Access: | https://www.mdpi.com/1996-1073/18/3/565 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1850068116871053312 |
|---|---|
| author | Zhongcheng Wang Ruhong Li Jie Zhu Zhenqiang Fu |
| author_facet | Zhongcheng Wang Ruhong Li Jie Zhu Zhenqiang Fu |
| author_sort | Zhongcheng Wang |
| collection | DOAJ |
| description | Ammonia, as a hydrogen carrier and an ideal zero-carbon fuel, can be liquefied and stored under ambient temperature and pressure. Its application in internal combustion engines holds significant potential for promoting low-carbon emissions. However, due to its unique physicochemical properties, ammonia faces challenges in achieving ignition and combustion when used as a single fuel. Additionally, the presence of nitrogen atoms in ammonia results in increased NOx emissions in the exhaust. High-temperature selective non-catalytic reduction (SNCR) is an effective method for controlling flue gas emissions in engineering applications. By injecting ammonia as a NOx-reducing agent into exhaust gases at specific temperatures, NOx can be reduced to N<sub>2</sub>, thereby directly lowering NOx concentrations within the cylinder. Based on this principle, a numerical simulation study was conducted to investigate two high-pressure injection strategies for sequential diesel/ammonia dual-fuel injection. By varying fuel spray orientations and injection durations, and adjusting the energy ratio between diesel and ammonia under different operating conditions, the combustion and emission characteristics of the engine were numerically analyzed. The results indicate that using in-cylinder high-pressure direct injection can maintain a constant total energy output while significantly reducing NOx emissions under high ammonia substitution ratios. This reduction is primarily attributed to the role of ammonia in forming NH<sub>2</sub>, NH, and N radicals, which effectively reduce the dominant NO species in NOx. As the ammonia substitution ratio increases, CO<sub>2</sub> emissions are further reduced due to the absence of carbon atoms in ammonia. By adjusting the timing and duration of diesel and ammonia injection, tailpipe emissions can be effectively controlled, providing valuable insights into the development of diesel substitution fuels and exhaust emission control strategies. |
| format | Article |
| id | doaj-art-c76c7a799ed24c6db574de28cad293cb |
| institution | DOAJ |
| issn | 1996-1073 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Energies |
| spelling | doaj-art-c76c7a799ed24c6db574de28cad293cb2025-08-20T02:48:09ZengMDPI AGEnergies1996-10732025-01-0118356510.3390/en18030565Effect of Selective Non-Catalytic Reduction Reaction on the Combustion and Emission Performance of In-Cylinder Direct Injection Diesel/Ammonia Dual Fuel EnginesZhongcheng Wang0Ruhong Li1Jie Zhu2Zhenqiang Fu3Merchat Marine College, Shanghai Maritime University, Shanghai 201306, ChinaMerchat Marine College, Shanghai Maritime University, Shanghai 201306, ChinaMerchat Marine College, Shanghai Maritime University, Shanghai 201306, ChinaMerchat Marine College, Shanghai Maritime University, Shanghai 201306, ChinaAmmonia, as a hydrogen carrier and an ideal zero-carbon fuel, can be liquefied and stored under ambient temperature and pressure. Its application in internal combustion engines holds significant potential for promoting low-carbon emissions. However, due to its unique physicochemical properties, ammonia faces challenges in achieving ignition and combustion when used as a single fuel. Additionally, the presence of nitrogen atoms in ammonia results in increased NOx emissions in the exhaust. High-temperature selective non-catalytic reduction (SNCR) is an effective method for controlling flue gas emissions in engineering applications. By injecting ammonia as a NOx-reducing agent into exhaust gases at specific temperatures, NOx can be reduced to N<sub>2</sub>, thereby directly lowering NOx concentrations within the cylinder. Based on this principle, a numerical simulation study was conducted to investigate two high-pressure injection strategies for sequential diesel/ammonia dual-fuel injection. By varying fuel spray orientations and injection durations, and adjusting the energy ratio between diesel and ammonia under different operating conditions, the combustion and emission characteristics of the engine were numerically analyzed. The results indicate that using in-cylinder high-pressure direct injection can maintain a constant total energy output while significantly reducing NOx emissions under high ammonia substitution ratios. This reduction is primarily attributed to the role of ammonia in forming NH<sub>2</sub>, NH, and N radicals, which effectively reduce the dominant NO species in NOx. As the ammonia substitution ratio increases, CO<sub>2</sub> emissions are further reduced due to the absence of carbon atoms in ammonia. By adjusting the timing and duration of diesel and ammonia injection, tailpipe emissions can be effectively controlled, providing valuable insights into the development of diesel substitution fuels and exhaust emission control strategies.https://www.mdpi.com/1996-1073/18/3/565zero-carbon fuelhigh temperature selective non-catalytic reductiondiesel ignitionengine emission characteristics |
| spellingShingle | Zhongcheng Wang Ruhong Li Jie Zhu Zhenqiang Fu Effect of Selective Non-Catalytic Reduction Reaction on the Combustion and Emission Performance of In-Cylinder Direct Injection Diesel/Ammonia Dual Fuel Engines Energies zero-carbon fuel high temperature selective non-catalytic reduction diesel ignition engine emission characteristics |
| title | Effect of Selective Non-Catalytic Reduction Reaction on the Combustion and Emission Performance of In-Cylinder Direct Injection Diesel/Ammonia Dual Fuel Engines |
| title_full | Effect of Selective Non-Catalytic Reduction Reaction on the Combustion and Emission Performance of In-Cylinder Direct Injection Diesel/Ammonia Dual Fuel Engines |
| title_fullStr | Effect of Selective Non-Catalytic Reduction Reaction on the Combustion and Emission Performance of In-Cylinder Direct Injection Diesel/Ammonia Dual Fuel Engines |
| title_full_unstemmed | Effect of Selective Non-Catalytic Reduction Reaction on the Combustion and Emission Performance of In-Cylinder Direct Injection Diesel/Ammonia Dual Fuel Engines |
| title_short | Effect of Selective Non-Catalytic Reduction Reaction on the Combustion and Emission Performance of In-Cylinder Direct Injection Diesel/Ammonia Dual Fuel Engines |
| title_sort | effect of selective non catalytic reduction reaction on the combustion and emission performance of in cylinder direct injection diesel ammonia dual fuel engines |
| topic | zero-carbon fuel high temperature selective non-catalytic reduction diesel ignition engine emission characteristics |
| url | https://www.mdpi.com/1996-1073/18/3/565 |
| work_keys_str_mv | AT zhongchengwang effectofselectivenoncatalyticreductionreactiononthecombustionandemissionperformanceofincylinderdirectinjectiondieselammoniadualfuelengines AT ruhongli effectofselectivenoncatalyticreductionreactiononthecombustionandemissionperformanceofincylinderdirectinjectiondieselammoniadualfuelengines AT jiezhu effectofselectivenoncatalyticreductionreactiononthecombustionandemissionperformanceofincylinderdirectinjectiondieselammoniadualfuelengines AT zhenqiangfu effectofselectivenoncatalyticreductionreactiononthecombustionandemissionperformanceofincylinderdirectinjectiondieselammoniadualfuelengines |