Chemical Engineering Research & Design最新文献_第10页

Foam detection in a stirred tank using deep learning neural networks 利用深度学习神经网络检测搅拌罐中的泡沫

IF 3.7 3区工程技术

Chemical Engineering Research & Design Pub Date : 2024-08-08 DOI: 10.1016/j.cherd.2024.08.005

{"title":"Foam detection in a stirred tank using deep learning neural networks","authors":"","doi":"10.1016/j.cherd.2024.08.005","DOIUrl":"10.1016/j.cherd.2024.08.005","url":null,"abstract":"<div><p>A deep learning method based on the Convolutional Neural Network (CNN) U-Net architecture has been explored as an image analysis tool for the detection and automated quantification of foam generated in a stirred tank. Multiple datasets of different sizes and with different types of foam were obtained experimentally and processed with data augmentation techniques in order to train the deep learning networks. The impact of adding attention and residual gates to the U-Net model to improve its performance, as well as the size of the dataset used to train the model have been assessed. The main factor influencing the accuracy of the models to detect the foam in the stirred tank is the size and quality of the dataset use to train the U-Net models; it must be sufficiently large and varied in terms of foam type/structure. The addition of attention gates and residual blocks to the U-Net model slightly improves the accuracy of foam detection, particularly for images that contain additional objects or obstructions, however the training time is 30 % longer than the standard U-Net model. In all cases, this image analysis method based on the U-Net model largely out performs conventional image analysis, which was not able to automatically differentiate between foam, additional objects in the tank and bubbles in the liquid. Two methods for the measurement of foam quantity (maximum foam height and foam volume) have also been developed based on the foam regions detected by the models. This is important for the application of the tool, which is to be used to understand the impact of operating conditions on foam formation in lab-/pilot-scale stirred tanks and then develop scale-up guidelines for foam control in industrial tanks.</p></div>","PeriodicalId":10019,"journal":{"name":"Chemical Engineering Research & Design","volume":null,"pages":null},"PeriodicalIF":3.7,"publicationDate":"2024-08-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142013135","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

On the co-combustion characteristics and kinetics of sludge, wood chips, and bituminous coal 污泥、木屑和烟煤的共燃特性和动力学研究

IF 3.7 3区工程技术

Chemical Engineering Research & Design Pub Date : 2024-08-08 DOI: 10.1016/j.cherd.2024.08.006

引用次数: 0

Reloading Process Systems Engineering within Chemical Engineering 重装化学工程中的工艺系统工程

IF 3.7 3区工程技术

Chemical Engineering Research & Design Pub Date : 2024-08-08 DOI: 10.1016/j.cherd.2024.07.066

{"title":"Reloading Process Systems Engineering within Chemical Engineering","authors":"","doi":"10.1016/j.cherd.2024.07.066","DOIUrl":"10.1016/j.cherd.2024.07.066","url":null,"abstract":"<div><p>Established as a sub-discipline of Chemical Engineering in the 1960s by the late Professor R.W.H. Sargent at Imperial College London, Process Systems Engineering (PSE) has played a significant role in advancing the field, positioning it as a leading engineering discipline in the contemporary technological landscape. Rooted in Applied Mathematics and Computing, PSE aligns with the key components driving advancements in our modern, information-centric era. Sargent’s visionary foresight anticipated the evolution of early computational tools into fundamental elements for future technological and scientific breakthroughs, all while maintaining a central focus on Chemical Engineering. This paper aims to present concise and concrete ideas for propelling PSE into a new era of progress. The objective is twofold: to preserve PSE’s extensive and diverse knowledge base and to reposition it more prominently within modern Chemical Engineering, while also establishing robust connections with other data-driven engineering and applied science domains that play important roles in industrial and technological advancements. Rather than merely reacting to contemporary challenges, this article seeks to proactively create opportunities to lead the future of Chemical Engineering across its vital contributions in education, research, technology transfer, and business creation, fully leveraging its inherent multidisciplinarity and versatile character.</p></div>","PeriodicalId":10019,"journal":{"name":"Chemical Engineering Research & Design","volume":null,"pages":null},"PeriodicalIF":3.7,"publicationDate":"2024-08-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142013084","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Computational modeling and experimental validation of pressure drop through multi-layered woven screens for polymer melts 聚合物熔体通过多层编织筛网的压降计算建模和实验验证

IF 3.7 3区工程技术

Chemical Engineering Research & Design Pub Date : 2024-08-06 DOI: 10.1016/j.cherd.2024.08.002

引用次数: 0

Novel insights into the recovery and recyclability of homogeneous polyoxometalate catalysts applying an efficient nanofiltration process for the selective catalytic oxidation of humins 应用高效纳滤工艺进行腐殖质选择性催化氧化的均相聚氧化金属催化剂的回收和可循环利用的新见解

IF 3.7 3区工程技术

Chemical Engineering Research & Design Pub Date : 2024-08-06 DOI: 10.1016/j.cherd.2024.08.007

{"title":"Novel insights into the recovery and recyclability of homogeneous polyoxometalate catalysts applying an efficient nanofiltration process for the selective catalytic oxidation of humins","authors":"","doi":"10.1016/j.cherd.2024.08.007","DOIUrl":"10.1016/j.cherd.2024.08.007","url":null,"abstract":"<div><p>Selective catalytic oxidation (SCO) of humins is a promising strategy to valorize undesired side streams of biomass conversion processes. Keggin-type polyoxometalates are efficient catalysts for the SCO of humins giving platform chemicals like formic acid, acetic acid or their respective esters up to combined yields of 51 %. Moreover, one of the main challenges for establishing continuous processes is the efficient catalyst recycling and product separation. Herein, we combined an optimization study for the process parameters in SCO with an integrated product separation carried out by using nanofiltration membranes. For this purpose, an enhanced reaction system consisting of 5 vol% methanol addition for CO<sub>2</sub> suppression in combination with 1.5 mmol pTSA as solubility promotor was applied using H<sub>5</sub>[PV<sub>2</sub>Mo<sub>10</sub>O<sub>40</sub>] (HPA-2) as a catalyst achieving a maximum humin conversion of 90 % resulting in 57 % carboxylic ester selectivity. In subsequent studies, an appropriate XN 45 nanofiltration membrane was identified allowing for >99 % catalyst and >90 % additive retention efficiently separating the acidic reaction products in the permeate. Furthermore, long-time stability of the membrane and thus of the separation process could be confirmed up to 168 h time on stream. Based on these results, the developed process represents an important milestone in the valorization of humins combined with efficient separation of the molecular polyoxometalate catalyst and could therefore be the basis for future developments.</p></div>","PeriodicalId":10019,"journal":{"name":"Chemical Engineering Research & Design","volume":null,"pages":null},"PeriodicalIF":3.7,"publicationDate":"2024-08-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0263876224004726/pdfft?md5=fbae6d1693595d817a043d7e389d8911&pid=1-s2.0-S0263876224004726-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141993876","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Study of hydrocyclone with flushing water device for sand washing of municipal sludge 带冲洗水装置的水力旋流器用于市政污泥洗砂的研究

IF 3.7 3区工程技术

Chemical Engineering Research & Design Pub Date : 2024-08-05 DOI: 10.1016/j.cherd.2024.08.003

{"title":"Study of hydrocyclone with flushing water device for sand washing of municipal sludge","authors":"","doi":"10.1016/j.cherd.2024.08.003","DOIUrl":"10.1016/j.cherd.2024.08.003","url":null,"abstract":"<div><p>Municipal sludge particles with size range between 0.045 and 0.2 mm were difficult to be precisely separated due to fine size distribution and high content of organic matter, resulting in low sand recycling efficiency. In view of the above problems, this paper proposed a flushing water device which was settled at the cone section of conventional hydrocyclone, aiming to utilize the supplementary water to strengthen the shear force field. Comparative test results showed that the organic matter content in the underflow product was significantly reduced after the addition of flushing water. Using the organic matter content and the sand recovery rate as the response index, the prediction models were established by using response surface optimization test. The influence order of different parameters on the response index was apex diameter, flushing device position and flow rate. Finally, an underflow product with organic matter content of 3.96 % and sand recovery rate of 48.03 % was obtained under the conditions of optimized parameter combinations. The research results can contribute to the development of a new method of residual sludge disposal that improves the sand washing efficiency and the cost-effectiveness of sludge treatment.</p></div>","PeriodicalId":10019,"journal":{"name":"Chemical Engineering Research & Design","volume":null,"pages":null},"PeriodicalIF":3.7,"publicationDate":"2024-08-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141946695","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Newly synthesised diglycolamide functionalised silica gel with terminal 2-ethylhexyl alkyl chain, Silica-DGA (2EH) having high ligand density for adsorption of trivalent actinide and lanthanide from acidic medium 新合成的具有末端 2- 乙基己基烷基链的二乙二醇酰胺功能化硅胶 Silica-DGA (2EH)，具有高配体密度，可吸附酸性介质中的三价锕系元素和镧系元素

IF 3.7 3区工程技术

Chemical Engineering Research & Design Pub Date : 2024-08-04 DOI: 10.1016/j.cherd.2024.08.004

{"title":"Newly synthesised diglycolamide functionalised silica gel with terminal 2-ethylhexyl alkyl chain, Silica-DGA (2EH) having high ligand density for adsorption of trivalent actinide and lanthanide from acidic medium","authors":"","doi":"10.1016/j.cherd.2024.08.004","DOIUrl":"10.1016/j.cherd.2024.08.004","url":null,"abstract":"<div><p>A novel diglycolamide resin with 2-ethylhexyl terminal alkyl chain functionalised to silica gel was synthesised and characterised by ATR-FTIR, SEM, TG/DSC, & <sup>13</sup>C (CP/MAS) solid state NMR techniques. Effective functionalization of the organic ligand upon silica gel was confirmed from the two carbonyl stretching frequencies at 1735 cm<sup>−1</sup> and 1619 cm<sup>−1</sup> in the FTIR spectrum and carbonyl carbon atom signal at 170 ppm in <sup>13</sup>C (CP/MAS) solid state NMR spectrum. Thermo gravimetric measurement showed 17.3 ± 0.2 % (W/W) weight loss corresponding to the ligand loading value of 425 µmol/g. The resin showed very high uptake of trivalent lanthanide and actinide ions from 4.0 M HNO<sub>3</sub> medium and very low distribution of Cs & Sr; K<sub>d</sub> ∼ 1.1×10<sup>3</sup> mL/g for Am(III), ∼ 1.41×10<sup>3</sup> mL/g for Eu(III), ∼2.5 mL/g for Sr and 1.53 mL/g for Cs. FTIR spectroscopic study of the Eu<sup>3+</sup> adsorbed resin showed single carbonyl stretching frequency at 1654 cm<sup>−1</sup>, instead of the two carbonyl stretching frequencies in fresh silica-DGA(2EH) resin indicating complexation through carbonyl oxygen. Very low K<sub>d</sub> of ∼1.2–5.1 mL/g for lanthanides/actinides from 4.0 M HNO<sub>3</sub> containing water soluble DGA namely N, N, N, N, Tetraethyldiglycolamide (TEDGA) in the concentration range 0.3–0.1 M indicates 99 % back adsorption feasibility.</p></div>","PeriodicalId":10019,"journal":{"name":"Chemical Engineering Research & Design","volume":null,"pages":null},"PeriodicalIF":3.7,"publicationDate":"2024-08-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141946696","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Energy-efficient semi-continuous distillation of a ternary mixture using combined tracking-economic model predictive control 利用组合跟踪-经济模型预测控制对三元混合物进行节能半连续蒸馏

IF 3.7 3区工程技术

Chemical Engineering Research & Design Pub Date : 2024-08-03 DOI: 10.1016/j.cherd.2024.07.064

{"title":"Energy-efficient semi-continuous distillation of a ternary mixture using combined tracking-economic model predictive control","authors":"","doi":"10.1016/j.cherd.2024.07.064","DOIUrl":"10.1016/j.cherd.2024.07.064","url":null,"abstract":"<div><p>Distillation is an energy-intensive separation technique. Semicontinuous distillation has gained attention as a cost-effective alternative to conventional multi-column distillation of multi-component mixtures. However, the cyclic behavior of semicontinuous distillation poses operational challenges considering cost of energy and need for maintaining consistent product purity. The challenge is addressed in this work by proposing a dual-objective Model Predictive Controller (MPC) that handles both product purity and energy consumption through a combined tracking-economic objective function. The proposed MPC features Extended Kalman Filter for state estimation and the successive linearization technique for building the prediction model. The nonlinear plant model is implemented in OpenModelica, which is linked to Matlab for MPC implementation. The effectiveness of the proposed MPC is demonstrated on semicontinuous distillation of Benzene, Toluene, and o-Xylene. The dual-objective MPC is shown to yield an energy saving of 8% per feed processed compared with conventional tracking MPC, while also performing well under process disturbances. It is also shown that the feed processed during a certain time period is 8% higher in the dual-objective MPC than the tracking MPC. The considerable economic improvement is gained without degrading the product purities, indicating that dual-objective MPC is an effective approach to energy-efficient operation of semicontinuous distillation.</p></div>","PeriodicalId":10019,"journal":{"name":"Chemical Engineering Research & Design","volume":null,"pages":null},"PeriodicalIF":3.7,"publicationDate":"2024-08-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141984598","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Model predictive control of switched nonlinear systems using online machine learning 利用在线机器学习对开关非线性系统进行模型预测控制

IF 3.7 3区工程技术

Chemical Engineering Research & Design Pub Date : 2024-08-03 DOI: 10.1016/j.cherd.2024.08.001

{"title":"Model predictive control of switched nonlinear systems using online machine learning","authors":"","doi":"10.1016/j.cherd.2024.08.001","DOIUrl":"10.1016/j.cherd.2024.08.001","url":null,"abstract":"<div><p>This work introduces an online learning-based model predictive control (MPC) approach for the modeling and control of switched nonlinear systems with scheduled mode transitions. Initially, recurrent neural network (RNN) models are constructed offline, utilizing sufficient historical operational data to capture the nominal system dynamics for each mode. Subsequently, we employ real-time process data to develop online learning RNN models, aiming to approximate the dynamics of switched nonlinear systems in the presence of of bounded disturbances. In cases where the initial RNN model is unavailable for a specific switching mode due to very limited historical data, we use real-time data from closed-loop operations under a proportional–integral (PI) controller to build online learning RNN models. To evaluate the predictive performance of online learning RNNs, a theoretical analysis on their generalization error bound is developed using statistical machine learning theory. Additionally, considering the presence or absence of initial RNN models, two MPC schemes are developed. These schemes employ RNNs as prediction models to stabilize switched nonlinear systems, ensuring closed-loop stability by accounting for the generalization error bound derived for online learning RNNs. Finally, the effectiveness of the proposed MPC schemes is demonstrated through a nonlinear process example with two switching modes.</p></div>","PeriodicalId":10019,"journal":{"name":"Chemical Engineering Research & Design","volume":null,"pages":null},"PeriodicalIF":3.7,"publicationDate":"2024-08-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141964698","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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 sintering temperature on ceramic membrane fabricated using coal flyash and natural clay for lignin recovery 烧结温度对利用粉煤灰和天然粘土制造的木质素回收陶瓷膜的影响

IF 3.7 3区工程技术

Chemical Engineering Research & Design Pub Date : 2024-08-02 DOI: 10.1016/j.cherd.2024.07.060

{"title":"Effect of sintering temperature on ceramic membrane fabricated using coal flyash and natural clay for lignin recovery","authors":"","doi":"10.1016/j.cherd.2024.07.060","DOIUrl":"10.1016/j.cherd.2024.07.060","url":null,"abstract":"<div><p>This study explores the utilization of coal fly ash combined with natural clay as a precursor for creating ceramic membranes through the uniaxial compaction method, aiming at lignin separation. These membranes were sintered at varying temperatures from 600 to 1000 °C. Thermal Gravimetric Analysis (TGA) revealed the robust thermal stability of the membranes. Fourier Transform Infrared (FTIR) analysis affirmed the presence of silica and alumina within the membranes. X-ray Diffraction (XRD) peaks indicated the crystalline structure and the presence of metal oxides originating from the fly ash and clay components. Scanning Electron Microscopy (SEM) and Atomic Force Microscopy (AFM) images illustrated the porous nature and rough surface of the ceramic membranes. The average pore radius of the fabricated membrane expanded from 43.12 to 7.91 nm with increasing temperature. Concurrently, membrane flux decreased from 4.13 to 0.96 ×10<sup>−6</sup> m<sup>3</sup>/m<sup>2</sup> s with higher temperatures. Lower contact angles indicated the hydrophilic properties of membranes. All membranes exhibited superior corrosion resistance and negative zeta potential, owing to the significant silica content in the fly ash. Lignin separation efficiency increased from 65 % to 81 % with increasing temperatures. The optimal sintering temperature was determined to be 800 °C, achieving a lignin recovery greater than 76 % and a membrane permeability of about 7×10<sup>−9</sup> m<sup>3</sup>/m<sup>2</sup> s kPa. Thus, the fly ash-clay-based ultrafiltration membranes synthesized in this study offer the potential for lignin biomass recovery from biorefinery effluent.</p></div>","PeriodicalId":10019,"journal":{"name":"Chemical Engineering Research & Design","volume":null,"pages":null},"PeriodicalIF":3.7,"publicationDate":"2024-08-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141953860","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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