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Chinese Journal of Chemical Engineering 2018年第2期26卷 400-406页

作者： zechen jin dezhen chen lijie yin yuyan hu huangqing zhu liu hong Thermal and Environmental Engineering Institute Tongji UniversityShanghai 200092China

Molten plastics are characterised with high viscosity and low thermal conductivity. Applying falling film pyrolysis reactor to deal with waste plastics can not only improve heat transfer efficiency, but also solve the flow problem.In this work, the pyrolysis process of molten polypropylene(PP) in a vertical falling film reactor is experimentally studied, and the influence of heating temperature on pyrolysis products is discussed. It has been found that with the temperature increases from 550 ℃ to 625 ℃, the yield of pyrolysis oil decreases from 74.4 wt%(± 2.2 wt%) to53.5 wt%(±1.3 wt%). The major compositions of the pyrolysis oil are C_9, C_(12) and C_(18), and β-scission reactions are predominant. The content of the light fraction C_6-C_(12) of pyrolysis oil is 69.7 wt%. Compared with other pyrolysis reactors, the yield of oil from vertical falling film pyrolysis reactor is slightly higher than that from tubular reactor,equal to that from rotary kiln reactor, and slightly lower than that in medium fluidised-bed reactor.

关键词：热分解过程加热温度反应堆电影掉落塑料熔融垂直

Heat transfer characteristics of molten plastics in a vertical falling film reactor

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Chinese Journal of Chemical Engineering 2019年第5期27卷 1015-1020页

作者： zechen jin Lijie Yin Dezhen Chen Yuanjie Jia Jun Yuan Boyang Yu Thermal and Environmental Engineering Institute Tongji UniversityShanghai 200093China Shanghai Municipal Engineering Design Institute (Group) Co. LtdShanghai 200092China

The heat transfer efficiency during the pyrolysis process is a key factor to be considered in the design of pyrolysis reactors. In this study, the average apparent heat transfer characteristics of molten plastic pyrolysis in a vertical falling film reactor were explored by experiments and numerical simulation and the apparent heat transfer coefficients were determined. In addition, the temperature distribution and the thickness of the liquid film in the reactor were predicted and the influences of pyrolysis temperatures on the average apparent heat transfer coefficients were discussed.

关键词： Molten plastic Heat transfer Pyrolysis Vertical falling film reactor

Co-pyrolysis characteristics of typical components of waste plastics in a falling film pyrolysis reactor

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Chinese Journal of Chemical Engineering 2018年第10期26卷 2176-2184页

作者： zechen jin Lijie Yin Dezhen Chen Yuanjie Jia Jun Yuan Yuyan Hu Thermal and Environmental Engineering Institute Tongji University Shanghai 200092 China Shanghai Municipal Engineering Design Institute (Group) Co. Ltd. Shanghai 200092 China

Waste plastics mainly come from MSW and usually exist in the form of mixed plastics. During the co-pyrolysis process of mixed plastics, various plastic components have different physicochemical properties and reaction mechanisms. Considering the high viscosity and low thermal conductivity of molten plastics, a falling film pyrolysis reactor was selected to explore the rapid co-pyrolysis process of typical plastic components(PP, PE and PS).The oil and gas yields and the compositions of pyrolysis products of the three components under different ratios at pyrolysis temperatures were analyzed to explore the co-pyrolysis characteristics of PP, PE, and PS. The study is of great significance to the recycling of waste plastics.

关键词：热分解特征混合塑料塑料部件反应堆合作废物电影掉落

Synthesis of 1,8-naphthalimide-based fluorescent nano-probes and their application in pH detection

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Chinese Chemical Letters 2018年第10期29卷 1500-1502页

作者： Langping Zhou zechen jin Xiaoxiang Fan Yuhua Yao Zhaoyang Chen Weibing Zhang Junhong Qian Shanghai Key Laboratory of Functional Materials Chemistry School of Chemistry & Molecular EngineeringEast China University of Science and Technology

Two kinds of fluorescent nano-probes（pH-A and pH-B） with different diameters for the determination of H＋concentration, based on photo-induced electron transfer mechanism, were synthesized through click reaction. In which 1,8-naphthalimide was employed as the fluorophore and N,N-dimethylethylenediamine as the receptor. The effects of particle size and linker length on the photophysical properties of the probe were studied. The results revealed that the nano-probes were more sensitive toward pH with increasing particle size. The fluorescence intensity at 529 nm（I529） of the nano-probe p H-A of 120 nm exhibited good linear relationship with solution＇s pH in the range of 6–8. The probe p H-A displayed excellent selectivity and competition toward proton over other possible coexisted ions, and it could be applied to detect pH in realistic samples（river water, urine）.

关键词： Fluorescent probe Nano-particles Naphthalimide pH detection Realistic samples

Response of ocean acidification to atmospheric carbon dioxide removal

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Journal of Environmental Sciences 2024年第6期140卷 79-90页

作者： Jiu Jiang Long Cao Xiaoyu jin zechen Yu Han Zhang Jianjie Fu Guibin Jiang School of Environment Hangzhou Institute for Advanced StudyUniversity of Chinese Academy of SciencesHangzhou 310024China State Key Laboratory of Environmental Chemistry and Ecotoxicology Research Center for Eco-Environmental SciencesChinese Academy of SciencesBeijing 100085China Key Laboratory of Geoscience Big Data and Deep Resources of Zhejiang Province School of Earth SciencesZhejiang UniversityHangzhou 310058China Zhejiang Climate Center Hangzhou 310052China

Artificial CO_(2)removal from the atmosphere(also referred to as negative CO_(2)emissions)has been proposed as a potential means to counteract anthropogenic climate change.Here we use an Earth system model to examine the response of ocean acidification to idealized atmospheric CO_(2)removal scenarios.In our simulations,atmospheric CO_(2)is assumed to increase at a rate of 1%per year to four times its pre-industrial value and then decreases to the pre-industrial level at a rate of 0.5%,1%,2%per year,respectively.Our results show that the annual mean state of surface ocean carbonate chemistry fields including hydrogen ion concentration([H^(+)]),pH and aragonite saturation state respond quickly to removal of atmospheric CO_(2).However,the change of seasonal cycle in carbonate chemistry lags behind the decline in atmospheric CO_(2).When CO_(2)returns to the pre-industrial level,over some parts of the ocean,relative to the pre-industrial state,the seasonal amplitude of carbonate chemistry fields is substantially larger.Simulation results also show that changes in deep ocean carbonate chemistry substantially lag behind atmospheric CO_(2)change.When CO_(2)returns to its pre-industrial value,the whole-ocean acidity measured by[H^(+)]is 15%-18%larger than the pre-industrial level,depending on the rate of CO_(2)decrease.Our study demonstrates that even if atmospheric CO_(2)can be lowered in the future as a result of net negative CO_(2)emissions,the recovery of some aspects of ocean acidification would take decades to centuries,which would have important implications for the resilience of marine ecosystems.

关键词： Carbon dioxide removal Net negative CO_(2)emission Ocean acidification Climate change Earth system modeling

市政污泥焚烧烟气中N_(2)O排放及其影响因素分析

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锅炉技术 2022年第6期53卷 13-18,27页

作者：金则陈邱凤翔胡维杰冯昱恒上海市政工程设计研究总院(集团)有限公司上海200092 同济大学机械与能源工程学院上海200092

干化焚烧是我国市政污泥处置的主要工艺,在污泥焚烧过程中会生成一定量一氧化二氮(N_(2)O)。其增温潜势达到了CO_(2)的300倍,在“碳达峰”“碳中和”国家战略的背景下,有必要关注污泥焚烧中的N_(2)O排放特性,但目前对这一问题的系统性... 详细信息

干化焚烧是我国市政污泥处置的主要工艺,在污泥焚烧过程中会生成一定量一氧化二氮(N_(2)O)。其增温潜势达到了CO_(2)的300倍,在“碳达峰”“碳中和”国家战略的背景下,有必要关注污泥焚烧中的N_(2)O排放特性,但目前对这一问题的系统性研究还鲜有报道。从实验室和工业规模污泥焚烧炉2个维度对污泥焚烧过程中的N_(2)O排放特性进行了研究。首先在实验室滴管炉中对温度、氧含量对N_(2)O排放浓度的影响进行分析,发现污泥焚烧烟气的N_(2)O浓度随温度的升高而减少,随氧含量的上升而增加。然后,在工业规模级污泥焚烧线烟气中N_(2)O浓度进行测定,发现N_(2)O排放质量浓度在15~120 mg/m^(3)的范围内。在此基础上通过最小二乘法获取了N_(2)O随烟气中氧含量及稀相区温度的关联式,并通过皮尔森相关系数分析,发现N_(2)O与温度的相关性更高。最后,经估算得到鼓泡流化床焚烧过程中单位质量干污泥产生N_(2)O的二氧化碳当量碳排放平均可达371 kg/t。

关键词：污泥焚烧 N_(2)O 温度二氧化碳当量

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美国污水污泥焚烧烟气排放标准分析与启示

给水排水 2023年第9期49卷 158-164页

作者：邱凤翔胡维杰卢骏营金则陈张鹏飞上海市政工程设计研究总院(集团)有限公司上海200092

介绍了美国污泥处理处置的总体情况,简要分析美国环保法规体系,并对比中美污泥焚烧烟气排放标准,同时对比分析了美国污泥焚烧烟气排放标准和垃圾焚烧烟气排放标准,最后提出了美国污泥焚烧烟气排放标准的针对性制定对我国污泥焚烧烟气排... 详细信息

介绍了美国污泥处理处置的总体情况,简要分析美国环保法规体系,并对比中美污泥焚烧烟气排放标准,同时对比分析了美国污泥焚烧烟气排放标准和垃圾焚烧烟气排放标准,最后提出了美国污泥焚烧烟气排放标准的针对性制定对我国污泥焚烧烟气排放标准的启示。从美国污泥焚烧烟气排放浓度的限值、中美污泥焚烧处理工程烟气排放浓度的实际情况看,我国污泥焚烧处理烟气排放标准仍有很大的提升空间。

关键词：污泥焚烧烟气排放标准污泥处理处置污泥法规美国

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市政污水污泥水热耦合干化系统能耗模拟

洁净煤技术 2023年第9期29卷 69-77页

作者：冯昱恒韩梦曦余天驰金则陈胡维杰张鹏飞陆利烨吴乃新同济大学机械与能源工程学院上海201800 上海新近纪智能科技有限公司上海200001 上海市政工程设计研究总院(集团)有限公司上海200092 华能太仓电厂江苏苏州215400 上海锅炉厂有限公司上海200245

干化+焚烧技术已逐渐成为我国大中城市中心城区污泥的重要处置手段,水热炭化预处理可提高污泥脱水性能,进而降低系统能耗,但对水热+干化污泥预处置过程的能耗分析还鲜有报道。研究了200~260℃下水热炭化预处理污泥的三相产物分布及水热... 详细信息

干化+焚烧技术已逐渐成为我国大中城市中心城区污泥的重要处置手段,水热炭化预处理可提高污泥脱水性能,进而降低系统能耗,但对水热+干化污泥预处置过程的能耗分析还鲜有报道。研究了200~260℃下水热炭化预处理污泥的三相产物分布及水热液有机组分构成,在此基础上建立了水热+空气干化系统的能量-质量流模型,并分析了水热条件对系统能耗的影响,最后与空气干化系统、厌氧发酵+空气干化系统能耗进行对比。发现釜内压力为8 MPa,水热反应温度由200℃上升至240℃时,由于水热液中热值较高的有机组分芳香烃、含氮杂环比例明显下降,水热反应釜能耗由184 kJ/kg(以原污泥计)降至161 kJ/kg,温度上升至260℃时,由于水蒸气气相分率明显增加及水热液中芳香烃含量回升,能耗上升至278 kJ/kg。受水蒸气气相分率影响,240℃下水热反应能耗随压力升高而降低,压力升至4 MPa后降低趋势迅速放缓。直接空气干化系统在干化空气温度为110℃时,系统总能耗为1942 kJ/kg;厌氧消化+干化系统由于对沼气进行高效热回收利用,消化时间为10 d时,系统热耗低至212 kJ/kg,总能耗为984 kJ/kg;而水热炭化+干化系统由于有效提升了污泥脱水性能,使系统总能耗进一步降低,240℃水热温度下系统总能耗为597 kJ/kg。研究结果为污泥独立焚烧或与燃煤电站耦合燃烧前预处理方式的选择和优化提供了基础数据和理论依据。

关键词：污水污泥水热炭化能耗分析热干化预处理过程模拟

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加氢裂化高压管道监测技术探讨

化工管理 2024年第13期 67-69页

作者：晏泽晨陈婷金波李旭东中海油气(泰州)石化有限公司江苏泰州225300 江苏省特种设备安全监督检验研究院江苏泰州225300

加氢裂化工艺管道中,使用的不锈钢材质为TP347,而这种不锈钢在高温高压及应力作用下易发生晶间腐蚀和氢致开裂。为了及时发现这类问题,文章对现有的超声导波、声发射、分布式光纤测温等管道监测技术进行了研究,探讨了红外热成像监测技... 详细信息

加氢裂化工艺管道中,使用的不锈钢材质为TP347,而这种不锈钢在高温高压及应力作用下易发生晶间腐蚀和氢致开裂。为了及时发现这类问题,文章对现有的超声导波、声发射、分布式光纤测温等管道监测技术进行了研究,探讨了红外热成像监测技术的可行性。并现场验证红外热成像监测技术的可靠性,为管道故障的自动诊断和预测提供重要支持。

关键词：加氢裂化管道红外热成像

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根据简单空间群的位置群确定可能的铁电相

人工晶体 1985年第Z1期 8-8页

作者：廖理几陈钢金泽宸北京工业大学应用物理系

可能的铁电相变共有88种。此点已由 Aizu 及 Shavalov 等人详细论证过。本文叙述一种新的简单方法,可以方便地得到以上结果。我们建议,空间群的位置群可以分为二类,第二类位置是其坐标只包括变量 x、y、z、和零的位置。可以证明,此种位... 详细信息

可能的铁电相变共有88种。此点已由 Aizu 及 Shavalov 等人详细论证过。本文叙述一种新的简单方法,可以方便地得到以上结果。我们建议,空间群的位置群可以分为二类,第二类位置是其坐标只包括变量 x、y、z、和零的位置。可以证明,此种位置的轨迹是径矢而其位置群是极性群。还可以进一步证明,各简单空间群的点群和此种第二类位置群的关系满足居里原理的要求。因此,根据某种简单空间群的第二类位置群即可以确定,如果某晶体的空间群可由此简单空间群导出,则由此晶体可

关键词：空间群点群晶架群位置群铁电相变