FUEL
·
2024
·
IF 6.7
Zhongwei Meng,Zhongqiang Bao,Zhao Chen,Bosong Zeng,Zihan Qin,Jie Tan,Ping Pu
The regeneration characteristics of a diesel particulate filter (DPF) are studied on a regeneration test bench, with a focus on the effects of ash and catalyst, including the effects of ZnO and CeO 2 on the regeneration performance and emission characteristics of the DPF. The results indicate that the addition of ZnO and CeO 2 can easily lead to local high temperatures during the regeneration process of the DPF, with the highest peak temperature appearing in a 1:3 ratio for both ZnO and CeO 2 , leading to a significant increase in CO 2 . Compared with ZnO, CeO 2 can advance the DPF rapid regeneration period by about 300 s. When the ratio of PU: CeO 2 is 1:5, the total particulate matter emitted is reduced to the lowest level, but it will significantly increase the emission of nuclear model particles, especially particles below 23 nm. Under the same mixing ratio, an increase in carbon loading can enhance the oxidation ability of ZnO towards carbon black, but the difference between the number of particles emitted during DPF regeneration and regeneration efficiency will gradually decrease.
研究领域:
环境科学
·
能源工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY
·
2025
·
IF 2.4
Xiaowen Yu,Hao Wu,Wenrui Li,Hongmin Yang
BACKGROUND The massive emission of greenhouse gases represented by CO 2 has led to many environmental and climate problems. Chemical absorption after combustion has become an effective method for CO 2 capture. Meanwhile, this method also leads to potential emission of pollutants, consisting mainly of ethanolamine (MEA) and ammonia (NH 3 ). However, few studies focus on the emission characteristics of pollutants in chemical absorption systems and the factors influencing the emissions. RESULTS In this experiment, MEA and NH 3 emissions during the CO 2 capture process by the chemical absorption method under different conditions, such as flue gas and absorbent solution temperature, liquid-to-gas ratio, CO 2 concentration in the flue gas, and absorbent CO 2 loading, were investigated. The results indicate that the MEA and NH 3 are released during the CO 2 capture process, and the amount of release varies with many parameters. Under typical conditions, the emissions of MEA and NH 3 were stabilized at 85.8 and 21.5 mg Nm −3 , respectively. The emissions of MEA and NH 3 increased steadily with the temperature of the flue gas and increasing absorbent solution. Higher liquid-to-gas ratio led to more MEA and NH 3 emissions, and higher absorbent CO 2 loading could inhibit the MEA and NH 3 emissions. Calculation of the maximum reduction rate also showed that CO 2 loading has the greatest impact on pollutant emissions, and optimizing it reduces pollutant emissions by at least 40%. CONCLUSION It was found that pollution emissions can be controlled by optimizing operating parameters, which can provide a reference for reducing pollutant emissions in the industry. © 2025 Society of Chemical Industry (SCI).
研究领域:
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Energies
·
2022
·Vol. 15
·期 3
·1023
·
IF 3.252
Xiaowei Xu,Enlong Liu,Neng Zhu,Fanfu Liu,Feng Qian
As fossil fuels continue to be extracted and used, issues such as environmental pollution and energy scarcity are surfacing. For the transportation industry, the best way to achieve the goal of “carbon neutrality” is to research efficient power systems and develop new alternative fuels. As the world’s largest product of chemicals, ammonia is a new renewable fuel with good combustion energy. It can be used as an alternative fuel to reduce carbon emissions because of its proven production process, low production and transportation costs, safe storage, the absence of carbon-containing compounds in its emissions, and its future recyclability. This paper firstly introduces the characteristics of ammonia fuel engine and its problems; then it summarizes the effects of various ammonia-blended fuels on the combustion and emission characteristics of the engine from the combustion problem of ammonia-blended engine; then the fuel storage of ammonia-blended hydrogen is discussed, the feasibility of hydrogen production instead of hydrogen storage is introduced.Keywords:engine;mixed fuel;hybrid fuel;combustion performance;emissions
研究领域:
能源工程
·
环境科学
✓ 已验证
DOI
高影响因子
ENERGY & FUELS
·
2024
·
IF 5.2
Xiaowen Yu,Hao Wu,Wenrui Li,Qi Zhang,Hongmin Yang
Aerosols from the chemical absorption systems, which use organic amine solutions as absorbents to capture CO2 in the flue gas, may pollute the atmosphere and damage the ecosystem. Based on the chemical absorption platform, this study focuses on investigating the formation mechanism and emission characteristics of aerosols in chemical absorption systems. The aerosols generated under standard operating conditions were analyzed using scanning electron microscopy (SEM) and energy dispersive spectrometry (EDS). Additionally, controlled experiments were conducted to demonstrate the impact of heterogeneous reactions on aerosol generation. In addition, the effects of practical operating parameters on aerosol emissions were explored and evaluated. The results showed that the emission of aerosols in the flue gas increased significantly after the chemical absorption platform. Most of the aerosols generated in the chemical absorption platform are submicron particles of below 1 μm, with a few micron-sized particles. Aerosol generation is significantly influenced by the presence of CO2, which is mainly attributed to heterogeneous reactions. Increasing the liquid-to-gas ratio and the absorbent concentration enhances the heterogeneous reaction, which leads to an increase in aerosol emissions. Lower flue gas temperatures and CO2 loading inhibit the occurrence of heterogeneous reactions, thus reducing aerosol emissions. According to the results of the maximum emission reduction rate, it was found that the absorbent concentration had the greatest degree of influence on aerosol emissions, the maximum emission reduction rate could reach close to 50%, and the CO2 loading had the most minor influence on aerosol emissions, which was only 13%.
研究领域:
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
BUILDING AND ENVIRONMENT
·
2019
·
IF 4.82
Shen Yang,Xudong Yang,Dusan Licina
People spend a substantial amount of daily time in vehicle environments being exposed to variety of airborne chemicals. High concentrations of volatile organic compounds (VOCs) inside vehicle cabins have been of increasing concern owing to various health risks. Yet, there is a limited knowledge and data about VOC emissions from interior vehicular materials. In a controlled small-scale ventilated chamber, we quantified dynamic VOC emission characteristics for four commonly-used vehicular interior materials (leather coat of seats (LCS), dashboard (DB), pillar (PI) and ceiling (CE)) exposed to the two interior air temperatures (25 and 60 °C). The emission strengths of VOCs increased with temperature elevation by 3–36 times, but not linearly for every group of compounds. The level of individual VOC compounds emitted was a strong function of time, indicating the importance of a continuous sampling approach. Correlation analysis of individual VOCs revealed different emission mechanisms among the major compounds. The source apportionment results indicated that the LCS materials were associated with emissions of aromatics, carbonyls and other VOCs at 25 °C, while special attentions should be paid to the DB and the PI for their predominant contributions to extremely elevated level of aliphatic compounds at 60 °C. The results of this study are potentially useful for database of VOC emissions from vehicular materials, development of improved standard testing methods and for improved modeling of VOC emissions.
研究领域:
环境科学
·
公共卫生
✓ 已验证
产品关联
DOI
高影响因子
ENERGY CONVERSION AND MANAGEMENT
·
2018
·
IF 6.377
Mingzhang Pan,Rong Huang,Jinyang Liao,Tiancheng Ouyang,Zeyuan Zheng,Delin Lv,Haozhong Huang
The n -pentanol/diesel dual-fuel coupled with EGR (exhaust gas recirculation) technology could simultaneously reduce soot and nitrogen oxide (NO X ) emissions discharged from the compression ignition engine. However, under high EGR rates, the low cetane number of the n -pentanol/diesel dual fuel resulted to combustion deceleration behavior. Because the combustion rate has a significant influence on the thermal efficiency of the engine, it was necessary to add 2-ethylhexyl nitrate (EHN) as a cetane improver to fuel mixtures to ensure that the n -pentanol/diesel fuel has appropriate combustion characteristics. In this study, it was attempted to investigate the performance and emission of a four-cylinder, turbocharged diesel engine with EHN fueled with n -pentanol/diesel blends at varying EGR rates. The five tested fuels included pure diesel (P0), and a mixture of 50% n -pentanol and 50% diesel (P50). Moreover, EHN was added to P50 at ratios of 0.5, 1, and 2%. The results showed that P50 could reduce soot emission, nucleation and accumulation mode particles. However, the burning speed and brake thermal efficiency (BTE) were notably reduced, and emissions of hydrocarbon (HC) and carbon monoxide (CO) significantly increased. With the EGR technology, NO X emission was significantly reduced. When EHN was added to P50, engine ignition delay was shortened, BTE increased, and HC and CO emissions were substantially reduced. The use EGR technology combined with n -pentanol and EHN simultaneously reduced soot and NO X emissions, and only slightly reduced BTE.
研究领域:
能源工程
·
环境科学
·
机械工程
✓ 已验证
DOI
高影响因子
FUEL PROCESSING TECHNOLOGY
·
2022
·
IF 8.129
Hao Chen,Xin Su,Fengyu Sun,Jingjing He,Zhanming Chen,Peng Zhang,Hongming Xu
In this study, the combustion and emission characteristics of a diesel engine fueled with diesel cyclopentanol blends were experimentally studied through the engine bench test and real-time vehicle test. The results indicated that the cyclopentanol addition weakened the premixed combustion process and accelerated the diffusion combustion process, resulting in an increased peak cylinder pressure and peak combustion temperature . In addition, with the increase of cyclopentanol addition, the ignition delay prolonged, the combustion duration shortened and the heat released more concentratedly. The addition of cyclopentanol decreased both the PM number and volume concentrations significantly, while increased the NOx emission due to the increased peak combustion temperature. At 2000 r/min, CP10 had little effect on inhibiting the nucleation ultrafine particles (≤ 50 nm). Urban, rural and highway roads were considered for on-road real-time vehicle test. The results were consistent with the engine bench test. For urban, rural, and highway areas, the average PN emissions of CP20 were 4.948 × 10 6 , 4.707 × 10 6 , and 3.314 × 10 6 per cm 3 , respectively, while those for diesel were 5.755 × 10 6 , 5.547 × 10 6 , and 4.058 × 10 6 per cm 3 , respectively.
研究领域:
机械工程
·
汽车工程
·
环境科学
·
燃烧科学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）