Asia-Pacific Journal of Chemical Engineering最新文献

{"title":"Research progress of CO2 absorbent in postcombustion capture process","authors":"Youkun Gao,&nbsp;Chenjun Ning,&nbsp;Longjie Liu,&nbsp;Yi Ye,&nbsp;Sida Tian,&nbsp;Xinglei Zhao","doi":"10.1002/apj.3172","DOIUrl":"https://doi.org/10.1002/apj.3172","url":null,"abstract":"<p>Excessive emissions of greenhouse gases, particularly carbon dioxide (CO₂), are the primary culprits behind the phenomenon of global warming, and reducing CO₂ emissions has become the primary global concern for all countries. CO₂ capture, utilization, and storage (CCUS) technology is a key strategy in achieving the goals of the dual carbon strategy, and carbon capture is one of the most critical technology links. However, the development of chemical absorbents have been hindered by these problems such as poor absorption rate, low absorption capacity, poor stability, high energy consumption for regeneration, and high recovery cost. Therefore, how to realize the development and industrial application of CO₂ chemical absorbents with efficient capture and low energy consumption for regeneration is an extremely severe challenge to be broken through at present. Herein, the current research progress of chemical absorbents is summarized and discussed in depth, which focuses on the absorption mechanism, absorption performance, advantages, and disadvantages of various absorbents. Subsequently, the existing problems and corresponding solutions for the research system are pointed out. Finally, the future development direction of absorbents is prospected.</p>","PeriodicalId":49237,"journal":{"name":"Asia-Pacific Journal of Chemical Engineering","volume":"20 2","pages":""},"PeriodicalIF":1.4,"publicationDate":"2025-01-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143801378","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Localized corrosion behavior on a heterogeneous surface involving multicomponent reactive transport and morphology evolution","authors":"Jukai Chen,&nbsp;Xiaodan Wang,&nbsp;Ruidong Li,&nbsp;Yueshe Wang,&nbsp;Haisheng Li,&nbsp;Yinghua Chen","doi":"10.1002/apj.3176","DOIUrl":"https://doi.org/10.1002/apj.3176","url":null,"abstract":"<p>Localized corrosion sometimes brings about unanticipated and catastrophic damages in petrochemical pipelines and pressure vessels. For localized corrosion modeling, multicomponent reactive transport and corrosion morphology evolution are two arduous problems that involve multi–physical-(electro) chemical processes along with multi–temporal and spatial scales. In this study, the lattice Boltzmann method (LBM) is employed to shed some light on the evolution of localized corrosion on a heterogeneous surface focusing on the effects of electrolyte ohmic resistance and diffusion. The corrosion pit is always initiated at the junction of anode and cathode sites; however, quite different morphologies are prompted under ohmic control or ohmic-diffusion control. Under ohmic control, the pit propagates along the interface of the anode and cathode. Under ohmic-diffusion control, the pathway of reactive species is broadened, and the corrosion morphology is developed into a more regular shape, like a flattened semicircle in 2-D modeling. This work presents the huge potential of LBM in long-term corrosion modeling.</p>","PeriodicalId":49237,"journal":{"name":"Asia-Pacific Journal of Chemical Engineering","volume":"20 2","pages":""},"PeriodicalIF":1.4,"publicationDate":"2024-11-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143801465","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Enhancing efficiency and economic viability in Rectisol system with cryogenic liquid expander","authors":"Yaopeng Qu,&nbsp;Jinju Sun,&nbsp;Peng Song,&nbsp;Jianmin Wang","doi":"10.1002/apj.3175","DOIUrl":"https://doi.org/10.1002/apj.3175","url":null,"abstract":"<p>Cryogenic liquid expanders have emerged as a potential energy-saving alternative to Joule–Thomson (JT) valves in cryogenic processes. The potential impact of incorporating a liquid expander into the Rectisol process has not been quantitatively evaluated. This study seeks to assess the effectiveness of replacing the JT valve with a liquid expander in the Rectisol process through the development of thermodynamic models for each component and conducting simulations using the ASPEN software. Additional analyses, including energy, CO₂ footprint, exergy, and economic evaluations, are performed for the Rectisol system. Utilizing an expander has been shown to lower energy usage by 2.52% and boost CO₂ capture by 5.55%, resulting in a 7.65% decrease in energy expenditure per unit CO₂ and a 1.29% rise in total exergy efficiency. Lower expander outlet temperatures and the green power output generated by the expander are the main reasons for these benefits, and the CO₂ footprint analysis explains how they work. The application of an expander in the Rectisol process is an economical and low-risk solution; the payback period is 0.32 years, and the lifetime profit is 53 folds of the investment.</p>","PeriodicalId":49237,"journal":{"name":"Asia-Pacific Journal of Chemical Engineering","volume":"20 2","pages":""},"PeriodicalIF":1.4,"publicationDate":"2024-11-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143801464","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Thermodynamic analysis and performance optimization on an ultra-low-temperature cascade refrigeration system using refrigerants R290 and R170","authors":"Shenrui Ji,&nbsp;Zhan Liu,&nbsp;Jiafeng Li,&nbsp;Tao Wang","doi":"10.1002/apj.3179","DOIUrl":"https://doi.org/10.1002/apj.3179","url":null,"abstract":"<p>To meet the strict requirement on whole chain of vaccine production, storage, transportation, and distribution, most researches have been done on cascade refrigeration systems to achieve high operation performance, while a research gap on the performance exploration of eco-friendly refrigeration systems still exists. In this paper, a comprehensive thermodynamic model was established to analyze the operation performance of a pre-cooled cascade refrigeration system with eco-friendly refrigerants propane (R290) and ethane (R170). Based on the present thermodynamic model, the performance optimization on the R290-R170 cascade refrigerator was made with considerations of degree of subcooling, degree of superheat, evaporation temperature, condensation temperature, cascade condensation temperature, and cascade temperature difference. Variations of the coefficient of performance, exergy destruction, and total exergy efficiency of the refrigeration cycle were analyzed. Two mathematical correlations yielding the optimal cascade condensation temperature and maximized coefficient of performance were developed by multilinear regression analysis. When the evaporation temperature is − 60°C, the maximized coefficient of performance and total exergy efficiency are 1.276 and 49.51%. This paper demonstrates the potential for improving the R290-R170 cascade refrigeration system and furnishes the basis for further exploration on ultra-low-temperature refrigerators.</p>","PeriodicalId":49237,"journal":{"name":"Asia-Pacific Journal of Chemical Engineering","volume":"20 2","pages":""},"PeriodicalIF":1.4,"publicationDate":"2024-11-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143801587","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Experimental and kinetic study on the laminar burning velocities of NH3 mixing with hydrous C2H5OH in premixed flames","authors":"Yindong Song,&nbsp;Haocheng Liu,&nbsp;Xiaofeng Yang,&nbsp;Xiuwei Cheng,&nbsp;Linfeng Xiang,&nbsp;Ruida Hou","doi":"10.1002/apj.3178","DOIUrl":"https://doi.org/10.1002/apj.3178","url":null,"abstract":"<p>In the present work, the laminar burning velocities of NH₃ + hydrous C₂H₅OH + air flames were measured using the heat flux method at 1 atm with varied equivalence ratios and mixing ratios (with hydrous ethanol molar fractions of 45%–75%). The measurements were carried out at unburned temperatures of 358 and 378 K. The results show that the laminar burning velocities increase with the increase of hydrous ethanol mixing ratio and temperature, indicating that hydrous ethanol contributes to the combustion of NH₃ flames. Based on Wang et al.'s CEU-NH3 mechanism, sensitivity, reaction pathways, and product formation rate analyses were conducted. The results show that the addition of water reduces the laminar burning velocities of mixed fuel. Intermediate radicals such as NH and HNO are crucial for the formation of NO. After adding water, in the preheating zone, the total production rates of key species such as NH₃, H, O, and OH radicals and intermediate species like NH₂, NH, HNO, and N decrease, leading to a reduction in the total NO generation rate and the peak mole fraction of NO in the reaction zone.</p>","PeriodicalId":49237,"journal":{"name":"Asia-Pacific Journal of Chemical Engineering","volume":"20 2","pages":""},"PeriodicalIF":1.4,"publicationDate":"2024-11-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143801383","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Correction to “Investigation of molecular interaction, performance of green solvent in esterification of ethanol and acetic acid at 298.15 K and at 1 atm”","authors":"","doi":"10.1002/apj.3167","DOIUrl":"https://doi.org/10.1002/apj.3167","url":null,"abstract":"&lt;p&gt;Ramalingam A, Banerjee T, Santhi VM, Mishra DK, Reji DJPM, Nagaraj S. Investigation of molecular interaction, performance of green solvent in esterification of ethanol and acetic acid at 298.15 K and at 1 atm. &lt;i&gt;Asia-Pac J Chem Eng.&lt;/i&gt; 2023; 18(2):e2875. doi:10.1002/apj.2875&lt;/p&gt;&lt;p&gt;Errors included in the original article may be due to the purity of individual components and experimental error, including sample bottle cleaning and the syringe used for density measurements. In addition, the apparent molar volume was calculated using a mathematical expression.&lt;/p&gt;&lt;p&gt;In Section 4.1, Para 1, Line 7: The following correction has been done.&lt;/p&gt;&lt;p&gt;“lesser than 0.02%” instead of “lesser than 0.23%”.&lt;/p&gt;&lt;p&gt;In Section 4.1, Equation (1): The equation was corrected as:&lt;/p&gt;&lt;p&gt;“\u0000&lt;span&gt;&lt;/span&gt;&lt;math&gt;\u0000 &lt;msub&gt;\u0000 &lt;mi&gt;ρ&lt;/mi&gt;\u0000 &lt;mtext&gt;mixture&lt;/mtext&gt;\u0000 &lt;/msub&gt;\u0000 &lt;mo&gt;=&lt;/mo&gt;\u0000 &lt;mi&gt;a&lt;/mi&gt;\u0000 &lt;mfenced&gt;\u0000 &lt;mi&gt;T&lt;/mi&gt;\u0000 &lt;/mfenced&gt;\u0000 &lt;mo&gt;+&lt;/mo&gt;\u0000 &lt;mi&gt;b&lt;/mi&gt;&lt;/math&gt;” instead of “\u0000&lt;span&gt;&lt;/span&gt;&lt;math&gt;\u0000 &lt;msub&gt;\u0000 &lt;mi&gt;ρ&lt;/mi&gt;\u0000 &lt;mtext&gt;mixture&lt;/mtext&gt;\u0000 &lt;/msub&gt;\u0000 &lt;mo&gt;=&lt;/mo&gt;\u0000 &lt;mi&gt;a&lt;/mi&gt;\u0000 &lt;mo&gt;+&lt;/mo&gt;\u0000 &lt;mi&gt;b&lt;/mi&gt;\u0000 &lt;mfenced&gt;\u0000 &lt;mi&gt;T&lt;/mi&gt;\u0000 &lt;/mfenced&gt;\u0000 &lt;mo&gt;+&lt;/mo&gt;\u0000 &lt;mi&gt;c&lt;/mi&gt;\u0000 &lt;msup&gt;\u0000 &lt;mfenced&gt;\u0000 &lt;mi&gt;T&lt;/mi&gt;\u0000 &lt;/mfenced&gt;\u0000 &lt;mn&gt;2&lt;/mn&gt;\u0000 &lt;/msup&gt;&lt;/math&gt;.&lt;/p&gt;&lt;p&gt;In Section 4.2, Para 2: The following correction has been done.&lt;/p&gt;&lt;p&gt;“[EMIM][EtSO&lt;sub&gt;4&lt;/sub&gt;] &gt; [EMIM][HSO&lt;sub&gt;4&lt;/sub&gt;] &gt; EtAc &gt; [ChCl][Gly] &gt; [ChCl][AA] &gt; EtOH &gt; HAc &gt; water”.&lt;/p&gt;&lt;p&gt;Use the above lines, instead of:&lt;/p&gt;&lt;p&gt;[EMIM][EtSO&lt;sub&gt;4&lt;/sub&gt;] &lt; [EMIM][HSO4] &lt; EtAc &lt; [ChCl][Gly] &lt; [ChCl][AA] &lt; EtOH &lt; HAc &lt; water.&lt;/p&gt;&lt;p&gt;In Section 4.2, Para 3, Line 3: the following line has been corrected as:&lt;/p&gt;&lt;p&gt;“It can be observed that the \u0000&lt;span&gt;&lt;/span&gt;&lt;math&gt;\u0000 &lt;msup&gt;\u0000 &lt;mi&gt;V&lt;/mi&gt;\u0000 &lt;mi&gt;E&lt;/mi&gt;\u0000 &lt;/msup&gt;&lt;/math&gt; values are positive for the binary mixtures of EtOH with EtAc, DES&lt;sub&gt;1&lt;/sub&gt; {[ChCl][2AA]}, and DES&lt;sub&gt;2&lt;/sub&gt; [ChCl][2Gly] over the entire composition range at all the studied temperatures”.&lt;/p&gt;&lt;p&gt;Use the above lines, instead of:&lt;/p&gt;&lt;p&gt;“It can be observed that the \u0000&lt;span&gt;&lt;/span&gt;&lt;math&gt;\u0000 &lt;msup&gt;\u0000 &lt;mi&gt;V&lt;/mi&gt;\u0000 &lt;mi&gt;E&lt;/mi&gt;\u0000 &lt;/msup&gt;&lt;/math&gt; values are positive for the binary mixtures of EtOH with EtAc, [EMIM][HSO&lt;sub&gt;4&lt;/sub&gt;], [EMIM][EtSO&lt;sub&gt;4&lt;/sub&gt;], [ChCl][AA], and [ChCl][Gly] over the entire composition range at all the studied temperatures”.&lt;/p&gt;&lt;p&gt;In Section 4.2, Para 4, Line 7: The following line has been corrected as:&lt;/p&gt;&lt;p&gt;“The maximum of excess molar ","PeriodicalId":49237,"journal":{"name":"Asia-Pacific Journal of Chemical Engineering","volume":"19 6","pages":""},"PeriodicalIF":1.4,"publicationDate":"2024-11-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/apj.3167","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142759707","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Numerical investigation of spindle position effects on steam ejector performance with a nonequilibrium condensation model","authors":"Fareeha Ahmed,&nbsp;Weixiong Chen","doi":"10.1002/apj.3173","DOIUrl":"https://doi.org/10.1002/apj.3173","url":null,"abstract":"<p>This research studied the performance of a spindle-controlled steam ejector using models such as ideal gas and wet steam under various operating conditions based on computational fluid dynamics (CFD). A wet steam model incorporating nonequilibrium condensation was employed to simulate the complex flow phenomena within the ejector. The structure of the flow, entrainment ratio (<i>Er</i>), and shock wave characteristics of the steam ejector were examined in two different models. Results indicate that the spindle position has a substantial impact on steam ejector performance. For the ideal gas and wet steam models, the optimal spindle position (SP-5) at a .1 MPa motive pressure achieves the highest entrainment ratios (<i>Er</i>) of 1.01 and 1.042, respectively. However, an ejector with a fixed geometry achieves <i>Er</i> values of only .517 and .549 for the ideal gas and wet steam models, under identical working conditions. This represents a substantial improvement of 89.8% over the fixed-geometry ejector. The wet steam model consistently predicts 2%–4% higher <i>Er</i> values compared with the ideal gas model across all spindle positions. The study also reveals that increasing the motive pressure from .1 to .3 MPa reduces <i>Er</i> by up to 45.8% at the optimal spindle position, with the shock train length extending to 35% of the mixing chamber at .3 MPa. These findings offer insights for improving the design and optimization of variable-geometry steam ejectors, potentially increasing efficiency in industrial applications.</p>","PeriodicalId":49237,"journal":{"name":"Asia-Pacific Journal of Chemical Engineering","volume":"20 2","pages":""},"PeriodicalIF":1.4,"publicationDate":"2024-11-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143801675","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Study on the characteristics of cavitation and COD removal of an addendum rotational hydrodynamic cavitation reactors","authors":"Faqi Zhou,&nbsp;Zhiwei Luo,&nbsp;Xianbo Wu,&nbsp;Yiming Xing,&nbsp;Shuangcheng Fu,&nbsp;Huixin Yuan","doi":"10.1002/apj.3177","DOIUrl":"https://doi.org/10.1002/apj.3177","url":null,"abstract":"<p>This paper presented an addendum rotational hydrodynamic cavitation reactors (ARHCR) that enabled circumferential shear cavitation, axial cavitation, and the Venturi effect, thus increasing cavitation efficiency. The experiments on hydroxyl (·OH) release and chemical oxygen demand (COD) removal demonstrate the feasibility of cavitation performance characterization and COD removal rate. The findings indicate that the COD removal rate can reach a maximum value of 28% or 30% with an increase in flow rate or rotating speed, respectively. Specifically, the maximum values were achieved at a rotation speed of 2,500 rpm or a flow rate of 1.0 m³·h⁻¹. Based on the mechanism of the addendum cavitation, the wedge angles, and the crucial structural parameters, were examined for optimizing cavitation performance. The results revealed that the cavitation number and cavitation bubble were significantly influenced by wedge angles, as well as the efficiency of cavitation energy. The mechanical shear of fluid was enhanced by wedge angles, resulting in constant compression and release of fluid with increased kinetic energy. This led to stronger effects on bulge blocks, and the formation of vortexes that rebounded constantly, resulting in lower pressure areas and expanded regions of cavitation. Among the wedge angles tested, the wedge angle of 15° exhibited the highest cavitation bubbles with a maximum value of 46%. This was 31% higher than the grooves-type cavitator reported. Furthermore, the cavitation performance was extremely improved with a wedge angle of 15°, as corresponding with the maximum efficiency of cavitation energy. These explorations provide references for the removal of COD in industrial and agricultural wastewater, as well as the development of novel reactors for wastewater treatment.</p>","PeriodicalId":49237,"journal":{"name":"Asia-Pacific Journal of Chemical Engineering","volume":"20 2","pages":""},"PeriodicalIF":1.4,"publicationDate":"2024-11-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143801623","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Heat transfer characteristics of petroleum coke particle packed bed: An experimental and CFD simulation study","authors":"Jindi Huang,&nbsp;Hui Lu,&nbsp;Jing Li,&nbsp;Youming Yang","doi":"10.1002/apj.3174","DOIUrl":"https://doi.org/10.1002/apj.3174","url":null,"abstract":"<p>Due to the complexity of the internal pore structure of petroleum coke loose particle-packed beds, measuring their thermal conductivity has always been a challenging problem. This work independently developed an experimental apparatus for testing the thermal conductivity of petroleum coke particle-packed beds and constructed a forward calculation model for the heat transfer process, which was based on one-dimensional unsteady heat transfer. Using the Sparse Nonlinear OPTimizer (SNOPT) algorithm, a mathematical relationship between the thermal conductivity <i>λ</i> of the coke bed, temperature <i>T</i>, and equivalent particle diameter <i>d</i>_<i>p</i> was established through inverse modeling. Concurrently, a digital model of the petroleum coke particle packed bed was derived utilizing three-dimensional computed tomography (CT) scanning technology, and a pore-scale gas–solid radiation heat transfer model was formulated based on CFD simulation technology, thereby further elucidating the heat transfer mechanism within the petroleum coke particle packed bed. The research results indicate that the temperature predicted by the established thermal conductivity model aligns well with experimental data. Further CFD simulation studies demonstrate that a smaller particle size leads to a larger temperature difference between the wall and the center of the packed bed, while a higher gas velocity results in a smaller temperature difference, with a linear correlation observed between these two factors. At high temperatures, thermal radiation between particles in the porous petroleum coke-packed bed plays a dominant role. The research outcomes can offer significant theoretical support for a profound analysis of the heat transfer behavior of petroleum coke-packed beds within a vertical shaft calciner.</p>","PeriodicalId":49237,"journal":{"name":"Asia-Pacific Journal of Chemical Engineering","volume":"20 2","pages":""},"PeriodicalIF":1.4,"publicationDate":"2024-11-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143801622","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Industrial experimental study on combustion characteristics and NOx emission characteristics of a 600 MWe wall-fired boiler under ultra-low excess air coefficient conditions","authors":"Shuguang Ti,&nbsp;Shanshan Deng,&nbsp;Zhi Yang,&nbsp;Li Zheng,&nbsp;Youjian Zhu,&nbsp;Ke Gao,&nbsp;Shang Gao,&nbsp;Jinhui Yang,&nbsp;Haopeng Wang","doi":"10.1002/apj.3171","DOIUrl":"https://doi.org/10.1002/apj.3171","url":null,"abstract":"<p>This paper aims to explore the effects of ultra-low excess air coefficients on the combustion performance and NO_<i>x</i> emission characteristics of coal-fired boilers through industrial experiments conducted on a 600 MWe wall-fired boiler. The results indicate that the burners demonstrate good ignition performance under different ultra-low excess air coefficient conditions. As the excess air coefficient increases, the temperature in the main combustion zone rises, and the ignition distance of pulverized coal shortens. Under ultra-low excess air coefficient conditions (such as 1.04), the unburned carbon content in fly ash reaches 5.50%, which is 3.23% higher than under the condition of 1.11, indicating poor pulverized coal burnout. When the excess air coefficient is close to the theoretical design value (such as 1.11), the carbon content in slag and the unburned carbon content in fly ash is relatively low (1.40% and 2.28%, respectively), indicating more complete combustion of pulverized coal. Additionally, the flue gas temperature at the air preheater outlet under this condition is relatively low; compared to the condition of an excess air coefficient of 1.07, the flue gas temperature is reduced by 6°C, thus reducing flue gas loss. Although the NO_<i>x</i> concentration under the condition of an excess air coefficient of 1.11 is slightly higher, the quantity of cooling water is less. Flow field tracking of the powder verifies the flow path and characteristics of the primary air of the burners, and the results show that the primary air flow path of the burners is relatively concentrated, avoiding impingement on the water-cooled walls and effectively preventing slagging issues on the water-cooled walls. The research findings are of great significance for improving the operational performance and environmental protection level of coal-fired boilers.</p>","PeriodicalId":49237,"journal":{"name":"Asia-Pacific Journal of Chemical Engineering","volume":"20 2","pages":""},"PeriodicalIF":1.4,"publicationDate":"2024-10-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143801660","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}