Journal of The Energy Institute最新文献_第2页

Numerical study on influences of intake temperature and swirl ratio on in-cylinder combustion and pollutant formation characteristics of ammonia/diesel dual-fuel engine 进气温度和涡流比对氨/柴油双燃料发动机缸内燃烧和污染物形成特性影响的数值研究

IF 5.6 2区工程技术

Journal of The Energy Institute Pub Date : 2024-10-18 DOI: 10.1016/j.joei.2024.101860

{"title":"Numerical study on influences of intake temperature and swirl ratio on in-cylinder combustion and pollutant formation characteristics of ammonia/diesel dual-fuel engine","authors":"","doi":"10.1016/j.joei.2024.101860","DOIUrl":"10.1016/j.joei.2024.101860","url":null,"abstract":"<div><div>In order to improve the combustion efficiency of ammonia fuel, and enhance the operational stability and emission level for ammonia engines, this study constructs an in-cylinder combustion numerical model of ammonia/diesel dual-fuel engine based on CONVERGE software, and investigates the effects of initial intake temperature and swirl intensity on in-cylinder combustion and pollutant formation characteristics of ammonia/diesel dual-fuel engine. The results show that increasing the intake temperature can improve the in-cylinder thermal atmosphere, advance the dual-fuel combustion reaction process, and increase the peak in-cylinder combustion pressure and temperature. The peak in-cylinder pressure increases from 6.05 to 6.44 MPa when the intake temperature is increased from 303 to 343 K. This is effective in improving the emissions of incomplete combustion for the ammonia/diesel dual-fuel engine. The in-cylinder unburned NH<sub>3</sub>, CO and HC emissions are reduced by 20.2 %, 77.1 % and 88.21 %, respectively. Increasing the swirl ratio enhances the in-cylinder gas disturbance, reduces the amount of fuel attached to the wall, and improves the quality of in-cylinder fuel-gas mixture. It also accelerates the process of combustible mixture formation, advances the starting point of ammonia fuel consumption, and accelerates the initial reaction rate. When the swirl ratio is increased from 0.5 to 3.0, the in-cylinder unburned NH<sub>3</sub> emission is reduced by 14.85 %. Reasonable adjustment of intake temperature and swirl ratio helps to improve the distribution of direct injection fuel particles inside the cylinder, thereby optimizing the dual-fuel combustion process and enhancing engine performance.</div></div>","PeriodicalId":17287,"journal":{"name":"Journal of The Energy Institute","volume":null,"pages":null},"PeriodicalIF":5.6,"publicationDate":"2024-10-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142536063","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Effect of ammonia reforming on combustion and emission characteristics of a 4-valve engine with an active pre-chamber 氨气转化对带有主动前腔的四气门发动机燃烧和排放特性的影响

IF 5.6 2区工程技术

Journal of The Energy Institute Pub Date : 2024-10-16 DOI: 10.1016/j.joei.2024.101861

{"title":"Effect of ammonia reforming on combustion and emission characteristics of a 4-valve engine with an active pre-chamber","authors":"","doi":"10.1016/j.joei.2024.101861","DOIUrl":"10.1016/j.joei.2024.101861","url":null,"abstract":"<div><div>Ammonia (NH<sub>3</sub>), as a hydrogen carrier and carbon-free fuel, offers an attractive opportunity for engines to achieve carbon neutrality. Turbulent jet ignition (TJI) combined with ammonia reforming shows the great capacity in ammonia-fueled engines. In this study, the effects of reforming strategy in an ammonia-fueled TJI are numerically studied, addressing the reforming ratio and reforming region. The results show that when only using reformate in the pre-chamber, the promoting effect of jet flame is more effective on the initial combustion phase. There are still very high NH<sub>3</sub> emissions due to the low reactivity in the main chamber. Further using reformate both in the pre-chamber and the main chamber, all the combustion stages (ST-CA10, CA10-50, CA50-90) can be shortened almost linearly with the increase of reforming ratio. Besides, the unburned NH<sub>3</sub> can be reduced to an acceptable level when the reforming ratio reaches 200 ‰ (hydrogen energy ratio of 18.50 %). The main reason is that the jet-induced strong flow field is coincident with the whole combustion stage. Further increasing the reforming ratio (pure hydrogen) in the pre-chamber, a high combustion efficiency and acceptable NH<sub>3</sub> emission can be achieved at a low hydrogen energy ratio (7.08 %). However, knocking combustion will happen at high reforming ratio with a low knock intensity. The results can provide some guidance for making the best-promoting benefit of the limited hydrogen in ammonia TJI engines with different reforming strategies.</div></div>","PeriodicalId":17287,"journal":{"name":"Journal of The Energy Institute","volume":null,"pages":null},"PeriodicalIF":5.6,"publicationDate":"2024-10-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142536062","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Desulfurization of pyrolytic oils from waste tire pyrolysis in a fluidized bed reactor with boron nitride adsorbents 利用氮化硼吸附剂在流化床反应器中对废轮胎热解产生的热解油进行脱硫

IF 5.6 2区工程技术

Journal of The Energy Institute Pub Date : 2024-10-16 DOI: 10.1016/j.joei.2024.101862

{"title":"Desulfurization of pyrolytic oils from waste tire pyrolysis in a fluidized bed reactor with boron nitride adsorbents","authors":"","doi":"10.1016/j.joei.2024.101862","DOIUrl":"10.1016/j.joei.2024.101862","url":null,"abstract":"<div><div>The study focused on producing hexagonal boron nitride (hBN) as an adsorbent which provides high efficiency in desulfurization processes. The synthesized hBN is used for sulfur removal from liquid fuel derived from end-of-life tires (ELTs). Characterization of hBN was performed using FTIR, XRD, TGA, and SEM-EDS analyses. Liquid fuel was produced in a fluidized bed reactor at 550 °C under a nitrogen gas flow. Post-desulfurization, the fuel's density, water content, and calorific value increased, while sulfur content and flash point decreased, with sulfur content showing a significant reduction of 79.23 %. The desulfurized fuel (PS-A) exhibited better combustion characteristics and closely resembled diesel fuel performance, though it slightly reduced engine effective efficiency by 1.06 % compared to diesel. Both PS-A and pre-desulfurized fuel (PS-B) significantly reduced soot emissions by 23.28 % and 20.81 %, respectively, compared to diesel. Additionally, CO emissions were lower for PS-A and PS-B, with reductions of 4.35 % and 2.00 %, respectively. However, CO<sub>2</sub> emissions increased by 1.60 % for PS-A and 0.86 % for PS-B, attributed to higher fuel consumption. Overall, hBN effectively reduced sulfur content and improved several fuel properties of pyrolytic liquids. The study highlights the environmental and economic benefits of enhancing ELT-derived liquid fuels and suggests potential applications in real systems, serving as a foundation for new technologies and projects.</div></div>","PeriodicalId":17287,"journal":{"name":"Journal of The Energy Institute","volume":null,"pages":null},"PeriodicalIF":5.6,"publicationDate":"2024-10-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142535986","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Synergistic effects of multi-walled carbon nanotubes and Mn0.4Cu0.6Fe2O4 on mercury removal with high efficiency and sulfur resistance 多壁碳纳米管和 Mn0.4Cu0.6Fe2O4 在高效脱汞和抗硫方面的协同效应

IF 5.6 2区工程技术

Journal of The Energy Institute Pub Date : 2024-10-16 DOI: 10.1016/j.joei.2024.101863

{"title":"Synergistic effects of multi-walled carbon nanotubes and Mn0.4Cu0.6Fe2O4 on mercury removal with high efficiency and sulfur resistance","authors":"","doi":"10.1016/j.joei.2024.101863","DOIUrl":"10.1016/j.joei.2024.101863","url":null,"abstract":"<div><div>Although ferrite-based adsorbents are the potential mercury removal materials for the high thermal stability, they usually suffer from a low efficiency in flue gas environment, especially under SO<sub>2</sub> condition. In the present paper, the multi-walled carbon nanotubes (MWCNTs) are utilized to improve the adsorption capacity of the Mn<sub>0.4</sub>Cu<sub>0.6</sub>Fe<sub>2</sub>O<sub>4</sub> adsorbents as well as inhibit the influence of flue gas composition. The influences of temperature, adsorbent type and the flue gas composition on Hg<sup>0</sup> removal efficiency are evaluated by experiments. The physical adsorption property of MWCNTs provides a platform for Hg<sup>0</sup> oxidation by Mn<sub>0.4</sub>Cu<sub>0.6</sub>Fe<sub>2</sub>O<sub>4</sub>. The synergistic effect between MWCNTs and Mn<sub>0.4</sub>Cu<sub>0.6</sub>Fe<sub>2</sub>O<sub>4</sub> enhances the mercury removal efficiency as well we the sulfur resistance. The results find that the adsorbent of Mn<sub>0.4</sub>Cu<sub>0.6</sub>Fe<sub>2</sub>O<sub>4</sub> containing 14 % MWCNTs has a high mercury removal efficiency of 95.6 % at 120 °C even under 1000 ppm SO<sub>2</sub> concentration. The kinetic behaviors of adsorbent adsorption are analyzed by theoretical models. The mechanisms of porous carbon-containing modifier to improve the mercury removal performance of Mn<sub>0.4</sub>Cu<sub>0.6</sub>Fe<sub>2</sub>O<sub>4</sub> are explored carefully. The present ferrite-based adsorbent exhibits promising prospects for the practical industrial applications of the low temperature mercury removal from coal-fired flue gas.</div></div>","PeriodicalId":17287,"journal":{"name":"Journal of The Energy Institute","volume":null,"pages":null},"PeriodicalIF":5.6,"publicationDate":"2024-10-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142535987","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Effect of Cu incorporation on Fe-based catalysts for selective CO2 hydrogenation to olefins 铜掺入对选择性二氧化碳加氢制烯烃的铁基催化剂的影响

IF 5.6 2区工程技术

Journal of The Energy Institute Pub Date : 2024-10-05 DOI: 10.1016/j.joei.2024.101849

{"title":"Effect of Cu incorporation on Fe-based catalysts for selective CO2 hydrogenation to olefins","authors":"","doi":"10.1016/j.joei.2024.101849","DOIUrl":"10.1016/j.joei.2024.101849","url":null,"abstract":"<div><div>The process of converting CO<sub>2</sub> into sustainable chemical feedstock and fuels through reaction with renewable hydrogen has been regarded as a promising direction in energy research. The enhancement of CO<sub>2</sub> hydrogenation efficiency to produce valuable hydrocarbons (specifically olefins) on Fe catalysts through Cu modification has been extensively researched. However, there is ongoing vigorous debate regarding the impact of these modifications on catalytic properties and the underlying mechanism. When compared to unprompted iron-based catalysts for CO<sub>2</sub> hydrogenation, the choice of desired products, such as C<sub>2</sub>-C<sub>4</sub> and C<sub>5+</sub>, is relatively low. So, promoters are frequently employed to customize and enhance product distribution. This study investigates how adding Cu to Fe-based supported catalysts affects their performance in converting CO<sub>2</sub> to hydrocarbons, with a specific emphasis on the interaction between Fe and Cu. To achieve this goal, catalysts were created using co-precipitation methods, varying the distribution of Fe and Cu within them. A set of composite catalysts underwent testing in a fixed bed setup using a reactant gas mixture at 350 °C and 30 bar pressure. Analysis techniques such as XRD, SEM, TEM, NH<sub>3</sub>-TPD, H<sub>2</sub>-TPR, and N<sub>2</sub> adsorption-desorption isotherms revealed the presence of iron-copper interaction within the composite catalysts. This interaction between the two components synergistically enhances the catalytic activity in CO<sub>2</sub> hydrogenation.</div></div>","PeriodicalId":17287,"journal":{"name":"Journal of The Energy Institute","volume":null,"pages":null},"PeriodicalIF":5.6,"publicationDate":"2024-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142422261","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

CoCe composite catalyst for CO2 hydrogenation: Effect of pore structure 用于二氧化碳加氢的 CoCe 复合催化剂：孔结构的影响

IF 5.6 2区工程技术

Journal of The Energy Institute Pub Date : 2024-10-05 DOI: 10.1016/j.joei.2024.101856

{"title":"CoCe composite catalyst for CO2 hydrogenation: Effect of pore structure","authors":"","doi":"10.1016/j.joei.2024.101856","DOIUrl":"10.1016/j.joei.2024.101856","url":null,"abstract":"<div><div>In order to realize the dual carbon goals of “carbon peaking” and “carbon neutrality”, the design and development CO<sub>2</sub> hydrogenation catalyst with high performances is of great significance. In this study, the CoCe composite catalysts were prepared by different methods and used to CO<sub>2</sub> catalytic hydrogenation. The physicochemical properties of the prepared catalysts were characterized by XRD, BET, TEM/HRTEM, and H<sub>2</sub>-TPD. The characterization results indicated that the studied CoCe composite catalytsts with different pore structure can be prepared by different preparation methods. The suitable preparation method can promote Co species to be dissolved into the CeO<sub>2</sub> lattice to form Ce-O-Co solid solution, which can promote the corresponding Co species to be reduced by H<sub>2</sub> to form active Co<sup>0</sup> species. The large specific surface area and developed ordered mesoporous structure of the CoCe-HT catalyst precursor, which was prepared by hard-template method, are conducive to the formation of active Co<sup>0</sup> species and activation of H<sub>2</sub> to produce reactive H species. The CO<sub>2</sub> hydrogenation activity of the studied CoCe composite catalysts follows the following order: CoCe-HT > CoCe-CP > CoCe-CA > CoCe-HY. The CoCe-HT catalyst showed high CO<sub>2</sub> hydrogenation conversion of 53.9 % and good using stability at 360 °C for 600 min. However, the CoCe-CA prepared by complex method has a poor use stability.</div></div>","PeriodicalId":17287,"journal":{"name":"Journal of The Energy Institute","volume":null,"pages":null},"PeriodicalIF":5.6,"publicationDate":"2024-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142433181","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Fuel consumption and exhaust emissions from Euro 6d vehicles fueled by innovative LPG/DME blend 以创新型液化石油气/二甲醚混合物为燃料的欧 6d 车辆的燃料消耗量和尾气排放量

IF 5.6 2区工程技术

Journal of The Energy Institute Pub Date : 2024-10-05 DOI: 10.1016/j.joei.2024.101851

{"title":"Fuel consumption and exhaust emissions from Euro 6d vehicles fueled by innovative LPG/DME blend","authors":"","doi":"10.1016/j.joei.2024.101851","DOIUrl":"10.1016/j.joei.2024.101851","url":null,"abstract":"<div><div>The aim of this research was to investigate the exhaust emissions from vehicles when fueled by a new and fully renewable fuel if made of bio-LPG and renewable dimethyl ether (DME), in comparison with standard gasoline. For this purpose, DME was mixed with liquefied petroleum gas (LPG) and used to fuel three bi-fuel LPG/gasoline spark-ignition engines light-duty vehicles. The suitable fuel blend was selected based on several octane tests using CFR engines. Exhaust emissions were tested over the WLTC and over the hot-start CADC cycles, as well as on the road. All Euro 6 standards were well fully met over the WLTC with both fuels. Switching from gasoline to LPG/DME fueling, the CO and NOx emission factors increased for two vehicles, whereas THC and NMHC decreased. Regarding particulates, for two vehicles the emission factors decreased, too. Generally, when the vehicles were driven on the CADC, lower gaseous emissions were observed compared to WLTC: excluding one vehicle, when switching from gasoline to LPG/DME fueling, the overall emission profiles reflected those of the same vehicles run on the WLTC. The unregulated particulate emissions measured over both testing cycles reflect what was detected for the regulated ones. Except for PN10, which was not measured, all regulated emissions were found to meet the (most severe) Euro 7 standards proposed at first by the European Commission. RDE tests showed that all vehicle emissions obtained from on-road tests were also found to meet the RDE standards, regardless of the fueling. Concerning CO<sub>2</sub> emissions, LPG/DME fueling guaranteed a systematic decrease for all vehicles and cycles, both on road and in the laboratory. The present investigation aims at demonstrating that the innovative LPG/DME 80 %/20 % (m/m) blend not only can be deemed as potentially suitable for GHG emissions reduction, as long as both DME and propane are obtained from renewable sources, but even compliant with EN 589 and both Euro 6 and part of preliminary Euro 7 exhaust emission proposal.</div></div>","PeriodicalId":17287,"journal":{"name":"Journal of The Energy Institute","volume":null,"pages":null},"PeriodicalIF":5.6,"publicationDate":"2024-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142444586","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Exploring the catalytic conversion of aromatic model compounds of coal pyrolysis over Ca(OH)2 探索煤热解芳香模型化合物在 Ca(OH)2 上的催化转化

IF 5.6 2区工程技术

Journal of The Energy Institute Pub Date : 2024-10-04 DOI: 10.1016/j.joei.2024.101850

{"title":"Exploring the catalytic conversion of aromatic model compounds of coal pyrolysis over Ca(OH)2","authors":"","doi":"10.1016/j.joei.2024.101850","DOIUrl":"10.1016/j.joei.2024.101850","url":null,"abstract":"<div><div>The distribution of pyrolysis products from aromatic model compounds in coal catalyzed by Ca(OH)<sub>2</sub> was investigated at the molecular level. The composition and relative abundance of the pyrolysis products from coal were analyzed using Py-GC/MS. The rapid pyrolysis products of coal at 600 °C consisted of phenols (15.94 %), non-phenolic oxygenated compounds (25.31 %), aliphatics (49.03 %), aromatic compounds (21.74 %), and other compounds (0.03 %). Six representative aromatic model compounds (2-methoxy-4-methylphenol, p-cresol, 2,4-dimethylphenol, o-cresol, guaiacol, and catechol) were selected. The pyrolysis process of model compounds was primarily the cleavage of C-O and C-C bonds, which resulted in the formation of methoxy and methyl radicals. The results revealed that Ca(OH)<sub>2</sub> undergoes acid-base reactions with -OH, thereby increasing the stability of the model compounds. Notably, the impact of Ca(OH)<sub>2</sub> on the composition and distribution of pyrolysis products was significantly more pronounced in aromatic compounds containing both -OCH<sub>3</sub> and -OH compared to those containing solely -OH. The formation pathways of pyrolysis products involving guaiacol and Ca(OH)<sub>2</sub> were elucidated through density functional theory (DFT) calculations, demonstrating that Ca(OH)<sub>2</sub> could facilitate more free radicals release and the conversion of model compounds. This study contributes to the understanding of the transformation of aromatic compounds during coal pyrolysis at the molecular level.</div></div>","PeriodicalId":17287,"journal":{"name":"Journal of The Energy Institute","volume":null,"pages":null},"PeriodicalIF":5.6,"publicationDate":"2024-10-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142422255","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Robust online monitoring system for PCDD/Fs in a full-scale MSWI by Deans switch: Efficiently separation and purification 通过迪恩斯开关，对大规模 MSWI 中的多氯二苯并对二恶英和多氯二苯并呋喃进行在线监测：高效分离和净化

IF 5.6 2区工程技术

Journal of The Energy Institute Pub Date : 2024-10-03 DOI: 10.1016/j.joei.2024.101852

{"title":"Robust online monitoring system for PCDD/Fs in a full-scale MSWI by Deans switch: Efficiently separation and purification","authors":"","doi":"10.1016/j.joei.2024.101852","DOIUrl":"10.1016/j.joei.2024.101852","url":null,"abstract":"<div><div>Existing online monitoring system for polychlorinated dibenzo-p-dioxins and dibenzofurans (PCDD/Fs), technically named Thermal Desorption-Gas Chromatography-Tunable Laser Ionization-Time of Flight Mass Spectrometry (TD-GC-TLI-TOFMS), has been applied in several incinerators in China. TD-GC-TLI-TOFMS can realize rapid detection of PCDD/Fs emissions from incineration sources. However, the long-term measurement of unclean flue gas will pollute the instruments in TD-GC-TLI-TOFMS, and interfere with the peak output of the target 1,2,4-trichlorobenzene (1,2,4-TrCBz). In this study, Deans switch (DS) was utilized for the first time in an online monitoring system for PCDD/Fs to separate 1,2,4-TrCBz signal from impurity signals, which improved the anti-interference capability of the system. Laboratory standard gas experiments showed that after adding a DS device between GC and TLI pulse valve, when the pressure set in DS was 4 psi and switched before or near the peak output of 1,2,4-TrCBz, the change of 1,2,4-TrCBz signal intensity was minimal. The impurities near the target peak were removed, and TLI-TOFMS was highly stable during continuous measurement. Moreover, the maximum intensity peak time of 1,2,4-TrCBz was stable after using DS in different switching time intervals. When connecting DS to TD-GC-TLI-TOFMS for field validation on the tail flue gas of a municipal solid waste incinerator (MSWI), results showed that a better 1,2,4-TrCBz signal could be obtained with a 69.52 % reduction of impurity peaks at the moments closer to the target peak. Furthermore, DS improved the sensitivity of the system to low concentration variations of 1,2,4-TrCBz in the flue gas. The robust system developed in this study can be better applied to incineration factories with poor combustion or suboptimal purification technology, facilitating online PCDD/Fs monitoring.</div></div>","PeriodicalId":17287,"journal":{"name":"Journal of The Energy Institute","volume":null,"pages":null},"PeriodicalIF":5.6,"publicationDate":"2024-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142422256","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

NH3 co-firing strategy in 500 MW tangential utility boiler: Impact of blending methods 500 兆瓦切向公用事业锅炉中的 NH3 联合燃烧策略：混合方法的影响

IF 5.6 2区工程技术

Journal of The Energy Institute Pub Date : 2024-10-03 DOI: 10.1016/j.joei.2024.101854

{"title":"NH3 co-firing strategy in 500 MW tangential utility boiler: Impact of blending methods","authors":"","doi":"10.1016/j.joei.2024.101854","DOIUrl":"10.1016/j.joei.2024.101854","url":null,"abstract":"<div><div>Ammonia co-firing is increasingly regarded as an effective strategy to reduce CO<sub>2</sub> emissions in coal-fired boilers. In this study, we introduce and evaluate two innovative fuel blending methods for ammonia-coal co-firing in a commercial 500 MW utility boiler: burner blending and in-boiler blending. Using computational fluid dynamics simulations, we investigated the effects of 20 % ammonia co-firing on heat transfer efficiency, fuel burnout rate, and pollutant emissions. The results show that while ammonia co-firing effectively reduces CO<sub>2</sub> emissions, it also leads to decreases in the furnace and furnace exit-gas temperatures due to the lower flame temperature and increased moisture production. Specifically, the total heat absorption by the water walls and heat exchangers decreased by 4.58 % in the burner blending method and 2.27 % in the in-boiler blending method compared to that with pure coal combustion. Although ammonia co-firing suppresses the generation of thermal NO, overall NO emissions increase significantly due to the substantial release of fuel NO. However, the in-boiler blending method demonstrated superior NO reduction, reducing NO emissions by 13.48 ppm compared to the burner blending method. In addition, the in-boiler blending method showed better combustion stability, achieving faster ignition and reducing the amount of unburned carbon in fly ash by 0.97 %, compared to that with the burner blending method. This is likely due to the higher concentration of combustible gases near the burner in the in-boiler blending system. These findings indicate that the in-boiler blending method is more effective than the burner blending method for ammonia-coal co-firing in a 500 MW utility boiler. This provides valuable insights into the implementation of ammonia co-firing in commercial boilers as part of efforts to achieve carbon neutrality.</div></div>","PeriodicalId":17287,"journal":{"name":"Journal of The Energy Institute","volume":null,"pages":null},"PeriodicalIF":5.6,"publicationDate":"2024-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142422259","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0