Energy Technologies & Resource Saving最新文献_第3页

GENERALIZED MATHEMATICAL MODEL OF PHYSICAL FIELDS OF TECHNOLOGICAL REDISTRIBUTIONS OF MANUFACTURING ELECTROGRAPHITE PRODUCTS 制造电石墨产品工艺再分配物理场的广义数学模型

Energy Technologies & Resource Saving Pub Date : 2021-06-20 DOI: 10.33070/etars.2.2021.03

S. Leleka

{"title":"GENERALIZED MATHEMATICAL MODEL OF PHYSICAL FIELDS OF TECHNOLOGICAL REDISTRIBUTIONS OF MANUFACTURING ELECTROGRAPHITE PRODUCTS","authors":"S. Leleka","doi":"10.33070/etars.2.2021.03","DOIUrl":"https://doi.org/10.33070/etars.2.2021.03","url":null,"abstract":"A generalized mathematical model of the physical fields of the main technological redistributions of electrographite products is developed, which is based on a continuous-discrete approach to the description of nonlinear behavior of solids, liquids and gases, and bulk media. It is shown that the continuous formulation of physical processes in the technology of carbongraphite production is based on the Euler frame of reference and may include the following equations: conservation of mass, momentum and energy, electrical conductivity in the vortex-free approximation of electric potential and transport of chemical components of combustion reactions. The discrete formulation of physical processes in bulk materials used in the technology of production of carbon graphite products is based on the Lagrangian frame of reference and may include the following equations: translational and rotational motion and energy. The application of the generalized mathematical model for construction or refinement of mathematical and numerical models of separate redistributions for performance of the numerical analysis of physical fields and parameters of processes and the equipment on examples of pressing of \"green\" electrode preparations and theoretical research of effective thermophysical properties of loose carbonaceous materials. On the basis of the developed generalized statement, the complex of separate mathematical models of such redistributions of production of electrographite production as: calcination of carbonaceous materials in electrocalciners, gasification of carbonaceous materials in the equipment of rotary calcination furnaces is also formulated and specified, burning and graphitization of electrographite blanks. Bibl. 40, Fig. 4.","PeriodicalId":11558,"journal":{"name":"Energy Technologies & Resource Saving","volume":"37 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74649783","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

THE USE OF EXPERIENCE OF COAL COMBUSTION IN A CIRCULATING FLUIDIZED BED FOR DESIGNING OF MEDIUM CAPACITY STEAM BOILERS FOR BURNING OF WET WASTE OF COAL PREPARATION AND RDF IN UKRAINE 利用循环流化床煤燃烧经验设计乌克兰制煤湿废和RDF中容量蒸汽锅炉

Energy Technologies & Resource Saving Pub Date : 2020-12-20 DOI: 10.33070/etars.4.2020.02

A. Topal, I. Holenko, M. Yurchenko

{"title":"THE USE OF EXPERIENCE OF COAL COMBUSTION IN A CIRCULATING FLUIDIZED BED FOR DESIGNING OF MEDIUM CAPACITY STEAM BOILERS FOR BURNING OF WET WASTE OF COAL PREPARATION AND RDF IN UKRAINE","authors":"A. Topal, I. Holenko, M. Yurchenko","doi":"10.33070/etars.4.2020.02","DOIUrl":"https://doi.org/10.33070/etars.4.2020.02","url":null,"abstract":"The necessity to implement advanced combustion technologies to utilize MSW/SRF/RDF and coal reject waste is an important problem for Ukraine to be solved. The introduction of such technologies will favor to involve annually about 2 mln t of RDF and partly cover deficit of bituminous coal, lack of which is currently faced. The technological niche for CFB combustion of RDF/SRF has certain optimal range bearing in mind technological, ecological (2010/75/EU Directive etc.) and financial performance. In view of this it seems reasonable to implement CFB for RDF/SRF firing starting from boiler steam capacity of 50-75 t/h while stoker firing of RDF could be efficiently implemented for lower range. The design of such boiler should rely upon lessons learned of commissioning and operating large-scale CFB boiler (having steam capacity of 670 t/h; 545/545 C) we obtained at Starobeshevo Power Plant in Ukraine. Accounting for the above the analysis of implementation and modifications made at large-scale CFB boiler (cyclones, seal pot, fluidized bed heat exchangers) has been done. The experience was used to design (along with KB “Energomashproekt”) medium-scale CFB boiler (having steam capacity of 75 t/h; 500 C) to burn high ash coal washering wastes and RDF/SRF. The sketch-3D-design of such boiler is presented with key performance. Bibl. 6, Fig. 4, Tab. 4.","PeriodicalId":11558,"journal":{"name":"Energy Technologies & Resource Saving","volume":"129 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-12-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81565812","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

COMBUSTION RESEARCH OF IMPINGING GAS JETS AT STABILIZATION OF THE FLAME FRONT ON A VERTICAL SURFACE 垂直表面火焰前缘稳定化时碰撞射流的燃烧研究

Energy Technologies & Resource Saving Pub Date : 2020-12-20 DOI: 10.33070/etars.4.2020.03

I. Sigal, A. Smikhula, O. Sigal, O. Marasin

{"title":"COMBUSTION RESEARCH OF IMPINGING GAS JETS AT STABILIZATION OF THE FLAME FRONT ON A VERTICAL SURFACE","authors":"I. Sigal, A. Smikhula, O. Sigal, O. Marasin","doi":"10.33070/etars.4.2020.03","DOIUrl":"https://doi.org/10.33070/etars.4.2020.03","url":null,"abstract":"The conditions of stabilization of combustion of detached gas jets on the vertical surface of the range of nozzle diameters d0 = 1.6–3.0 mm are investigated. The mechanism of flame stabilization of a detached gas jet on a vertical surface is shown, which allows to increase the gas flow rate through one nozzle by 3 or more times with stable combustion, compared to diffusion combustion of a free gas jet, which is not stabilized. The optimal distance to the vertical refractory surface in the nozzle calibers for the creation of slot bottom burner devices has been established. The necessity of using the minimum angles of attack till failure of combustion, which were experimentally founded, for the construction of slot bottom burner devices, is substantiated. It is experimentally established that starting from the gas pressure in the collector-pipe near 500 mmwg and, accordingly, the speed of its flow through the nozzle is more than near 100 m/s at a distance to the vertical surface on which the flame is stabilized 15 < L/d0 <= 30, for the range of nozzle diameters d0 = 1.6–3.0 mm, dimensionless area base sg/s0 of the elliptical cylinder Eb, less than 2–2.5 times of the maximum observed at a distance L/d0 near 40. Bibl. 15, Fig. 6.","PeriodicalId":11558,"journal":{"name":"Energy Technologies & Resource Saving","volume":"36 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-12-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82068747","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 4

DEVELOPMENT OF CONCEPTUAL TECHNICAL SOLUTIONS AND METHODS OF THEIR IMPLEMENTATION DURING THE DESIGN OF A DUST COAL STEAM GENERATOR OF SUPER-SUPER CRITICAL PARAMETERS OF STEAM 28 MPA/600 °С/600 °С FOR 300 MW ENERGY UNIT. PART 1. 300mw发电机组超超临界参数28mpa /600°С/600°С尘煤蒸汽发生器设计过程中概念性技术方案的制定及其实施方法。第1部分。

Energy Technologies & Resource Saving Pub Date : 2020-12-20 DOI: 10.33070/etars.4.2020.01

B. Rokhman, N. Dunaevska, V. Vifatnyuk

{"title":"DEVELOPMENT OF CONCEPTUAL TECHNICAL SOLUTIONS AND METHODS OF THEIR IMPLEMENTATION DURING THE DESIGN OF A DUST COAL STEAM GENERATOR OF SUPER-SUPER CRITICAL PARAMETERS OF STEAM 28 MPA/600 °С/600 °С FOR 300 MW ENERGY UNIT. PART 1.","authors":"B. Rokhman, N. Dunaevska, V. Vifatnyuk","doi":"10.33070/etars.4.2020.01","DOIUrl":"https://doi.org/10.33070/etars.4.2020.01","url":null,"abstract":"Increasing efficiency of power plant unit, reducing fuel costs, and CO2, NOx and SOx emissions can be achieved by increasing the pressure and temperature of the steam. Analysis carried out for boilers designed for supercritical steam parameters, showed that the increase in pressure and temperature is directly related to the stresses arising in the metal of the superheater, and, consequently, with the need of using high-temperature alloys. Thus, steam generators can be conventionally divided into three groups: supercritical (SC), super supercritical (SSC) and ultra supercritical (USC). The efficiency of the power units of the USC is 3–4 % higher than the efficiency of the SC units, and the efficiency of the power units of the USC is 6–8 % higher than the efficiency of the SC units. For the manufacture of USC boilers, steels based on nickel alloys are required, which are mainly at the stage of development and testing, while for the production of SSC steam generator, steels are manufactured on an industrial scale, therefore, currently, the best option is the construction of SSC power unites. The first part of the work describes the calculation method, the algorithm and the program with the help of which the design and verification thermal calculations of the SSC 28 MPa/600 °С/600 °С were carried out for a 300 MW power unit at rated loads. Two designs of vortex burners (coiled-blade and blade-blade) with a thermal power of 34.471 MJ/s and productivity (for coal) of 5902 kg/h have been developed. Original technical solutions have been developed to improve the reliability of the live steam output stage and to reduce the surface of the first stage of the reheater. Bibl. 5, Fig. 4, Tab. 1.","PeriodicalId":11558,"journal":{"name":"Energy Technologies & Resource Saving","volume":"9 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-12-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85727103","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

MODELING OF THE OXIDATION OF NITROGEN OXIDES BY OZONE 臭氧氧化氮氧化物的模拟

Energy Technologies & Resource Saving Pub Date : 2020-12-20 DOI: 10.33070/etars.4.2020.06

O. M. Kolomiets

引用次数: 0

OBTAINING OF CARBON-FREE IRON POWDERS BY REDUCTION METHOD IN CONVEYOR FURNACES WITH RECIRCULATION AND REGENERATION OF "GREEN" HYDROGEN 利用“绿”氢循环再生的输送炉还原法制备无碳铁粉

Energy Technologies & Resource Saving Pub Date : 2020-12-20 DOI: 10.33070/etars.4.2020.04

O. Khovavko, B. Bondarenko, O. Sviatenko

{"title":"OBTAINING OF CARBON-FREE IRON POWDERS BY REDUCTION METHOD IN CONVEYOR FURNACES WITH RECIRCULATION AND REGENERATION OF \"GREEN\" HYDROGEN","authors":"O. Khovavko, B. Bondarenko, O. Sviatenko","doi":"10.33070/etars.4.2020.04","DOIUrl":"https://doi.org/10.33070/etars.4.2020.04","url":null,"abstract":"The use of absolutely pure hydrogen to obtain carbon-free iron is justified. Such hydrogen can be obtained only by water electrolysis. According to modern trends it can be called \"green\" hydrogen\". Some aspects of pure iron powders obtaining by the method of hydrogen reduction in a conveyor furnace are described. Thermodynamic analysis of the process has shown the expediency of reduction gas re-circulation for the full utilization of its chemical potential. The concept of hydrogen utilization factor is introduced and considered. The concept of hydrogen utilization factor is introduced and considered. It is ascertained that the realization of hydrogen recirculation is possible only in a gas-tight aggregate. Powder locks for sealing the end faces of conveyor furnaces for reduction and annealing of metal powders are developed. The basics of energy-efficient scheme for a reduction of iron with hydrogen recіrculation and regeneration have been developed and realized on practice. This innovation allows to reduce gas consumption almost to the stoichiometric index. Bibl. 15, Fig. 4, Tab. 2.","PeriodicalId":11558,"journal":{"name":"Energy Technologies & Resource Saving","volume":"31 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-12-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89403403","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

APPLICATION OF THE THERMOELECTRIC HEAT PUMPS FOR THE DISTRICT HEATING SYSTEMS 热电热泵在区域供热系统中的应用

Energy Technologies & Resource Saving Pub Date : 2020-06-20 DOI: 10.33070/etars.2.2020.02

Yu.M. Lobunets

{"title":"APPLICATION OF THE THERMOELECTRIC HEAT PUMPS FOR THE DISTRICT HEATING SYSTEMS","authors":"Yu.M. Lobunets","doi":"10.33070/etars.2.2020.02","DOIUrl":"https://doi.org/10.33070/etars.2.2020.02","url":null,"abstract":"The article presents a preliminary analysis of the possibility of applying thermoelectric heat pumps (THP) in low-temperature district heating systems (in the 4–5 generation DH systems). The advantages of THP are the high reliability, the lack of moving parts and freons in their composition, the compactness, the independence of the scale factor. Unlike the compression heat pump, THP provides effective circuit solutions, giving them additional tangible benefits. These features make it possible to reproduce the ideal Lorentz cycle, which can be realized with series-connected thermoelectric modules. The total operating temperature difference is divided into a large number of small intervals, which ensures the high efficiency of each module, and the required temperature difference and performance are achieved by the set of a corresponding number of series-connected micro-THP. It is clear that such a scheme cannot be implemented using compression heat pumps because of a number of technical and economic constraints. There are no such restrictions for thermoelectric heat pumps since each thermoelement is a micro-HPs that can act as a separate THPs. On the example of THP with a rated power of 1kW, the characteristics of the proposed scheme were analyzed. Unlike the classic HP, it has great flexibility. Under given temperature conditions, the power of the considered THP can vary in the range from 0.5 kW to 5 kW only due to a change in the supply current. At the same time, its effectiveness varies in the range from COP = 14 to COP = 2. This opens up new opportunities for the creation of «smart» heating systems that allow optimization of heat consumption modes, adapting them to current needs by purely programmatic methods. The estimated capital cost of THP G » 300 EUR/kW is based on actual data on the current level of component cost. Ref. 6, Fig. 5, Tab. 1.","PeriodicalId":11558,"journal":{"name":"Energy Technologies & Resource Saving","volume":"8 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84158922","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

HYDROGEN: PROPERTIES, PRODUCTION AND USES 氢:性质、生产和用途

Energy Technologies & Resource Saving Pub Date : 2020-06-20 DOI: 10.33070/etars.2.2020.01

I. Karp

{"title":"HYDROGEN: PROPERTIES, PRODUCTION AND USES","authors":"I. Karp","doi":"10.33070/etars.2.2020.01","DOIUrl":"https://doi.org/10.33070/etars.2.2020.01","url":null,"abstract":"Electrolysis of water uses more energy to produce «green» hydrogen than can be obtained by using it. On 1 m3 of electrolytic hydrogen consumes from 4 to 5 kW·h of electricity, while it contains chemical energy of 3.0 kW·h. The calorific value of hydrogen is 3.3 times less than methane. Hydrogen dissolves in metals, causing their corrosion. Its transportation requires special materials for pipelines, as well as special design, compressors and control devices. Owing to wide borders of explosiveness, high speed of torch spreading its use is connected with risks and demands special safety measures. The use of hydrogen as a fuel for driving shunting capacities in the energy system of Ukraine or for substitution of liquid motor fuels requires for its production the amount of energy commensurate with the volume of its total consumption in Ukraine, significant amounts of water and solution of the problem of using surplus oxygen. Taking into account the cost of electricity from renewable energy sources in Ukraine, the economy of hydrogen production and its use is beyond reasonable limits. Transportation of hydrogen in compressed or liquefied state is energy and economically expensive. Mixtures of natural gas and hydrogen are allowed to be transported and used. The driver of hydrogen energy is the prevention of anthropogenic impacts on climate change, which in itself is problematic. The large number of projects on the hydrogen economy that have been introduced today in Europe and around the world can be explained by the significant funds allocated to the problem, in which major companies and scientists — hydrogen activists are interested. Bibl.16, Table 1.","PeriodicalId":11558,"journal":{"name":"Energy Technologies & Resource Saving","volume":"5 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75230533","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

COMPARATIVE ANALYSIS OF THE AVERAGE COST OF HEAT ENERGY PRODUCED IN BOILERS OF DIFFERENT POWER, TAKING INTO ACCOUNT THE ENVIRONMENTAL COMPONENT 在考虑环境因素的情况下，对不同功率锅炉产生的热能的平均成本进行比较分析

Energy Technologies & Resource Saving Pub Date : 2020-06-20 DOI: 10.33070/etars.2.2020.07

V. Stanytsina, G. Kuts, O. Teslenko, O.Ye. Malyarenko

引用次数: 3

CHEMICAL-TECHNOLOGICAL PROCESSING OF COALS OF VARIOUS REGIONS OF UKRAINE 乌克兰各地区煤的化学技术加工

Energy Technologies & Resource Saving Pub Date : 2019-09-20 DOI: 10.33070/ETARS.3.2019.01

I. Shulga, D. Miroshnichenko, V. Rudyka, A. Tsymbal

引用次数: 1