Thermal Science最新文献_第5页

Possibilities of steam boiler process optimization in the TPP Ugljevik TPP中蒸汽锅炉工艺优化的可能性

IF 1.7 4区工程技术

Thermal Science Pub Date : 2023-01-01 DOI: 10.2298/tsci2301133s

Goran Stupar, D. Tucaković, Ognjen Stamenković, Luka Petrovic, Borivoje Vujicic, Zarko Novakovic, Željko Milanović

{"title":"Possibilities of steam boiler process optimization in the TPP Ugljevik","authors":"Goran Stupar, D. Tucaković, Ognjen Stamenković, Luka Petrovic, Borivoje Vujicic, Zarko Novakovic, Željko Milanović","doi":"10.2298/tsci2301133s","DOIUrl":"https://doi.org/10.2298/tsci2301133s","url":null,"abstract":"The paper presents a technical solution for modernization with the aim of increasing the efficiency of the steam boiler of TPP Ugljevik, which implies the reorganization of the combustion system. More efficient operation of the furnace can be achieved by replacing the existing burners, reducing the number of burner levels as well as the organization of tangential combustion. The flame formed in the shape of a tube around the two central combustion vortices provides a larger amount of heat transferred to the combustion furnace, less fouling of its screen walls and thus a lower average temperature of the combustion products at its outlet. As the chosen reorganization affects the increase of the temperature of the superheated steam and the decrease of the temperature of the reheated steam, it has been proposed to reduce the area of the semi-irradiated superheater and increase the area of the second reheater. Taking into consideration that the reorganization of the combustion system may lead to the change of the thermal load of the evaporator located in the furnace, the paper presents the work of the steam boiler operation under new operating conditions. Used calculation system enables reliable prediction of operating characteristics of the steam boiler in new operating conditions of combustion, and its application helps assess the quality of the boiler in terms of how effective, efficient, safe and environmentally friendly its operating mode is. In this way, it is possible to form a comprehensive description of the operating mode of the steam boiler.","PeriodicalId":23125,"journal":{"name":"Thermal Science","volume":null,"pages":null},"PeriodicalIF":1.7,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68256405","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}

引用次数: 0

A new combined ZK-mZK dynamic model for Rossby solitary wave Rossby孤立波的一种新的联合ZK-mZK动力学模型

IF 1.7 4区工程技术

Thermal Science Pub Date : 2023-01-01 DOI: 10.2298/tsci2301599z

Baojun Zhao, Zi-Ming Jiang, Wen-Jin Sun

引用次数: 0

Magic ramie rope for the tug-of-war game 魔术麻绳拔河游戏

IF 1.7 4区工程技术

Thermal Science Pub Date : 2023-01-01 DOI: 10.2298/tsci2303127l

Guo-Liang Liu, Hong-Zhi Zhao, Fu-Juan Liu, Xiao-Xia Li, Xi-Bo Hao

引用次数: 0

Galerkin approach to approximate solutions of some boundary value problems 一些边值问题近似解的伽辽金方法

IF 1.7 4区工程技术

Thermal Science Pub Date : 2023-01-01 DOI: 10.2298/tsci2303957t

YiMin Tian, Xiu-Qing Peng

引用次数: 0

Artificial intelligence control system of heat recovery in thermal power plant 火电厂热回收人工智能控制系统

IF 1.7 4区工程技术

Thermal Science Pub Date : 2023-01-01 DOI: 10.2298/tsci2302241q

Hui-juan Qi, Hong-Kang Wen, Aixue Xu

{"title":"Artificial intelligence control system of heat recovery in thermal power plant","authors":"Hui-juan Qi, Hong-Kang Wen, Aixue Xu","doi":"10.2298/tsci2302241q","DOIUrl":"https://doi.org/10.2298/tsci2302241q","url":null,"abstract":"In order to improve the comprehensive utilization rate of energy in power plants, the author puts forward the research of artificial intelligence control system for heat and power plant waste heat recovery. In the heating system of waste heat recovery, intelligent time-sharing and zoning control is set according to user needs, which enables the heating system to adjust the temperature of heating water outlet in real time according to the dynamic change of outdoor climate, in the heating system of waste heat recovery, intelligent time-sharing and zoning control is set according to user needs, which enables the heating system to adjust the temperature of heating water outlet in real time according to the dynamic change of outdoor climate. The results show that the energy saving rate of time-sharing heating increases with the increase of outdoor temperature, when the outdoor temperature is 8?C, the energy saving rate is 0.35, in addition, the energy saving rate of the heating system is not only related to the outdoor temperature, but also to the length of the intermittent period, it is obvious that the longer the intermittent period is, the higher the energy saving rate is. In conclusion, the application of time division temperature control technology in the heating system greatly improves the energy saving effect of buildings, saves energy, and has extremely high economic, environ?mental and social benefits, which is worth advocating and promoting.","PeriodicalId":23125,"journal":{"name":"Thermal Science","volume":null,"pages":null},"PeriodicalIF":1.7,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68260600","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}

引用次数: 0

An efficient matrix method for coupled systems of variable fractional order differential equations 变分数阶微分方程耦合系统的有效矩阵法

IF 1.7 4区工程技术

Thermal Science Pub Date : 2023-01-01 DOI: 10.2298/tsci23s1195s

K. Shah, Bahaaeldin Abdalla, T. Abdeljawad, I. Suwan

{"title":"An efficient matrix method for coupled systems of variable fractional order differential equations","authors":"K. Shah, Bahaaeldin Abdalla, T. Abdeljawad, I. Suwan","doi":"10.2298/tsci23s1195s","DOIUrl":"https://doi.org/10.2298/tsci23s1195s","url":null,"abstract":"We establish a powerful numerical algorithm to compute numerical solutions of coupled system of variable fractional order differential equations. Our numer?ical procedure is based on Bernstein polynomials. The mentioned polynomials are non-orthogonal and have the ability to produce good numerical results as compared to some other numerical method like wavelet. By variable fractional order differentiation and integration, some operational matrices are formed. On using the obtained matrices, the proposed coupled system is reduced to a system of algebraic equations. Using MATLAB, we solve the given equation for required results. Graphical presentations and maximum absolute errors are given to illustrate the results. Some useful features of our sachem are those that we need no discretization or collocation technique prior to develop operational matrices. Due to these features the computational complexity is much more reduced. Further, the efficacy of the procedure is enhanced by increasing the scale level. We also compare our results with that of Haar wavelet method to justify the useful?ness of our adopted method.","PeriodicalId":23125,"journal":{"name":"Thermal Science","volume":null,"pages":null},"PeriodicalIF":1.7,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68265309","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}

引用次数: 1

Experimental study on characteristic and mechanism of simulated lunar rock destruction under high energy laser irradiation 高能激光辐照下模拟月球岩石破坏特性及机理的实验研究

IF 1.7 4区工程技术

Thermal Science Pub Date : 2023-01-01 DOI: 10.2298/tsci220807003z

Xuemin Zhou, Chuo Zhang, Junjun Liu, Haiyong Hao, Zheng Gao, Yan Wu, Qiu-Yue Li, Xiang Wen, Xuan Wang, Zhaoliang Yang

{"title":"Experimental study on characteristic and mechanism of simulated lunar rock destruction under high energy laser irradiation","authors":"Xuemin Zhou, Chuo Zhang, Junjun Liu, Haiyong Hao, Zheng Gao, Yan Wu, Qiu-Yue Li, Xiang Wen, Xuan Wang, Zhaoliang Yang","doi":"10.2298/tsci220807003z","DOIUrl":"https://doi.org/10.2298/tsci220807003z","url":null,"abstract":"The large load and poor heat dissipation of moon rock core drilling leads to the difficulty of rock breaking and low drilling and sampling efficiency. As a new auxiliary rock breaking method, laser rock breaking is expected to be applied to perturbation sampling in lunar rock drilling. Revealing the fracture characteristics and mechanism of rock under laser irradiation is an important basis for realizing laser-assisted lunar rock sampling. Basalt was used as simulated lunar rock sample, and its mechanical response characteristics under laser irradiation were analyzed from macro to micro point of view, and the failure law under different laser power and different irradiation time was explored. The results show that the failure of the sample under laser irradiation is mainly characterized by local rock melting and dynamic crack propagation, and the surface temperature of the sample follows the characteristics of Gaussian distribution. The laser power has a greater influence on the degree of rock weakening than the irradiation time. Laser irradiation of rocks can significantly reduce rock strength, and has obvious effects on improving rock breaking efficiency and reducing in situ disturbance. It is expected to provide theoretical and technical support for assisting lunar rock drilling and sampling in the future.","PeriodicalId":23125,"journal":{"name":"Thermal Science","volume":null,"pages":null},"PeriodicalIF":1.7,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68246647","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}

引用次数: 1

Optimizing transportation cost for biomass supply chain 生物质供应链运输成本优化

IF 1.7 4区工程技术

Thermal Science Pub Date : 2023-01-01 DOI: 10.2298/tsci23s1245k

S. Kousar, N. Sangi, N. Kausar, P. Agarwal, E. Ozbilge, Alper Bulut

引用次数: 0

Analysis of HIV-1 mathematical model using Taylor’s series method 用泰勒级数法分析HIV-1数学模型

IF 1.7 4区工程技术

Thermal Science Pub Date : 2023-01-01 DOI: 10.2298/tsci23s1423a

Naveed Ahmad, Z. Khan, M. Akbar, Areej A. Al-moneef

引用次数: 0

Experiment and simulation studies on thermal performance of a novel water-cooling premixed wall-hung gas boiler 新型水冷预混壁挂燃气锅炉热工性能的实验与仿真研究

IF 1.7 4区工程技术

Thermal Science Pub Date : 2023-01-01 DOI: 10.2298/tsci221017067w

Ning Wang, S. Deng, Zongyi Wang, Y. Gui, M. Le, Qinxin Zhao, Huaishuang Shao

{"title":"Experiment and simulation studies on thermal performance of a novel water-cooling premixed wall-hung gas boiler","authors":"Ning Wang, S. Deng, Zongyi Wang, Y. Gui, M. Le, Qinxin Zhao, Huaishuang Shao","doi":"10.2298/tsci221017067w","DOIUrl":"https://doi.org/10.2298/tsci221017067w","url":null,"abstract":"A wall-hung gas boiler was innovatively proposed and designed in this paper. Water-cooling premixed combustion and enhanced condensation heat exchange technology were adopted in the boiler. The extruded aluminum plate-fin structure was adopted in the burner and condensing heat exchanger. Experiment and numerical simulation studies were conducted on the flow, combustion, and heat exchange characteristics of the boiler. The effect of the fin structure, excess air coefficient, heat load, and water-cooling temperature on the thermal performance of the boiler was analyzed. The results showed that reliable ignition, stable combustion, uniform flame distribution, and low pollutant emissions can be achieved in the wall-hung gas boiler. Affected by burning intensity and internal flue gas recirculation, when the burner plate-fin gap was 1.63 mm, the flame was the shortest and the NOx emissions were the lowest. Under this fin condition, ultra-high efficiency and ultra-low emissions can be achieved in the boiler with a low excess air coefficient. When the excess air coefficient was 1.3, the NOx emissions were less than 30 mg/m3 at the heat load of 4-14 kW, and the thermal efficiency can reach up to 102.8% at the rated load of 14 kW. Within the scope of the experiment, the NOx emissions changed little with the water-cooling temperature. At the temperature of 333 K, there was still a great NOx emission reduction effect.","PeriodicalId":23125,"journal":{"name":"Thermal Science","volume":null,"pages":null},"PeriodicalIF":1.7,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68249088","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}

引用次数: 0