Investigation on the improvement of the combustion process through hybrid dewatering and air pre-heating process: A case study for a 150 MW coal-fired boiler

2021 ◽  
Author(s):  
Oguz Arslan ◽  
Oguzhan Erbas
Keyword(s):  
Combustion Process ◽  
Heating Process

Heating Path Generation and Simulation for Ship Plate Steel

2011 ◽  
Vol 421 ◽  
pp. 250-253
Author(s):  
Hu Zhu ◽  
Xiao Guang Yang
Keyword(s):  
Steel Plate ◽  
Simulation System ◽  
Simulation Software ◽  
Heating Process ◽  
Path Generation ◽  
Plate Steel ◽  
Heating Equipment ◽  
Line Heating ◽  
Steel Base

To lay the foundation of the automation for line heating forming, a method for heating path generation and simulation for ship plate steel base on STL mode was proposed in this paper. The line heating path was generated by slicing the STL model of the steel plate using a series of planes, and the models of the heating equipment of ship plate steel were build, and the heating process of ship plate steel can be simulated by inputting the models of the heating equipment into the simulation system that was built by using VC++ and OpenGL. The case study shows that the method can primely solve the inconvenient of manual heating and the whole heating process can be observed by the simulation so that the heating process can be made a reasonable monitoring, and the heating path generation and simulation software are runs stably and reliably.

scholarly journals Understanding the Dependence of Nanoparticles Magnetothermal Properties on Their Size for Hyperthermia Applications: A Case Study for La-Sr Manganites

Nanomaterials ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 1826
Author(s):  
Mylla C. Ferreira ◽  
Bruno Pimentel ◽  
Vivian Andrade ◽  
Vladimir Zverev ◽  
Radel R. Gimaev ◽  
...  
Keyword(s):  
Room Temperature ◽  
Blocking Temperature ◽  
Maximum Efficiency ◽  
Heating Process ◽  
Alternative Health ◽  
Heating Efficiency ◽  
Different Temperatures ◽  
Mean Size ◽  
The One

Magnetic oxides are promising materials for alternative health diagnoses and treatments. The aim of this work is to understand the dependence of the heating power with the nanoparticle (NP) mean size, for the manganite composition La0.75Sr0.25MnO3 (LSMO)—the one with maximum critical temperature for the whole La/Sr ratio of the series. We have prepared four different samples, each one annealed at different temperatures, in order to produce different mean NP sizes, ranging from 26 nm up to 106 nm. Magnetization measurements revealed a FC-ZFC irreversibility and from the coercive field as function of temperature we determined the blocking temperature. A phase diagram was delivered as a function of the NP mean size and, based on this, the heating mechanism understood. Small NPs (26 nm) is heated up within the paramagnetic range of temperature (T>Tc), and therefore provide low heating efficiency; while bigger NPs are heated up, from room temperature, within the magnetically blocked range of temperature (T<TB), and also provide a small heating efficiency. The main finding of this article is related with the heating process for NPs within the magnetically unblocked range of temperature (Tc>T>TB), for intermediate mean diameter size of 37 nm, with maximum efficiency of heat transfer.

scholarly journals Case Study of the Effect of Precoating on the Decarburization of the Surface Layer of Forged Parts during the Hot Die Forging Process

Materials ◽  
2021 ◽  
Vol 14 (2) ◽  
pp. 422
Author(s):  
Paweł Widomski ◽  
Maciej Zwierzchowski ◽  
Artur Barełkowski ◽  
Mateusz Tympalski
Keyword(s):  
Surface Layer ◽  
Induction Heating ◽  
Hot Forging ◽  
Heating Process ◽  
Forging Process ◽  
Die Forging ◽  
Forged Parts ◽  
Third Stage ◽  
Hot Die Forging

This paper aims to evaluate the effect of pre-coating of forged parts on decarburization in the die forging process. The studies consisted of three stages. In the first instance, different coatings were tested under laboratory conditions by heating steel samples to the temperature of 1200 °C for over five minutes to model the preheating conditions of the induction. Next, testing continued in a commercial forging stand where we tested the effects of different coatings on the rods decarburization during the induction heating process, usually performed before forging. Once completed testing, the measurements and observations of the decarbonized layer were made. The third stage involved analysis of the decarburization of the forged parts after forging. The forged parts were made using precoating of pre-forging elements; pieces cut off a metal rod. Based on tests results, the possibility of using this solution in the technique of industrial hot forging was evaluated. The results of laboratory tests have confirmed that lubrication of metal pieces is sufficient, as well as proved it to be effective in reducing decarburization of the surface layer. Research works conducted in an induction heater showed differences in decarburization depending on a substance and concentration of lubricants that were used. These differences become more apparent when observing the surface layer of the forged parts. Results indicate that decarburization may be reduced to a minimum when we use Bonderite product in a concentration of 66% and 50%. Another lubricant, Berulit 913, may also be used. However, due to burning graphite in high temperatures, reduction of decarburization goes only as far as half of the thickness of the decarbonized layer. Condursal has no significant effect; nevertheless, it protects over the induction heating stage.

scholarly journals Results of the study of kinetic parameters of spontaneous combustion of coal dust

2021 ◽  
Vol 246 ◽  
pp. 617-622
Author(s):  
Vladimir Rodionov ◽  
Sergei Tursenev ◽  
Igor Skripnik ◽  
Yurii Ksenofontov
Keyword(s):  
Spontaneous Combustion ◽  
Coal Dust ◽  
Combustion Process ◽  
Environmental Parameters ◽  
Heating Process ◽  
Main Task ◽  
Thermophysical Parameters ◽  
Coal Fuel ◽  
Spontaneous Combustion Of Coal ◽  
Practical Recommendations

The article is devoted to the study of the problem of spontaneous combustion of energy grades of coal not only during storage, but also during transportation. As the main samples for the study, the energy grades of SS and Zh coals were selected. The main task of the scientific research was to study the rate of cooling and heating of coal depending on their thermophysical parameters and environmental parameters. To solve this problem, the authors used both the author's installations designed to study the thermophysical parameters of the spontaneous combustion process (the Ya.S.Kiselev method), and the NETZSCH STA 449 F3 Jupiter synchronous thermal analysis device, the NETZSCH Proteus Termal Analysis software package. On the basis of a complex study of the spontaneous combustion process, the authors of the article obtained the kinetic characteristics of the spontaneous heating process (activation energy and pre-exponential multiplier). Nomograms of the permissible size of coal density of different types and shapes of accumulation depending on the ambient temperature are presented, practical recommendations for the prevention (avoidance) of spontaneous combustion of coal fuel are given.

Co-incineration of dried sewage sludge in coal-fired power plants: a case study

2000 ◽  
Vol 42 (9) ◽  
pp. 259-268 ◽  
Author(s):  
D. Luts ◽  
K. Devoldere ◽  
B. Laethem ◽  
W. Bartholomeeusen ◽  
P. Ockier
Keyword(s):  
Power Plants ◽  
Sewage Treatment ◽  
Combustion Process ◽  
Sludge Disposal ◽  
Total Input ◽  
Disposal Option ◽  
Dried Sludge ◽  
Alkali Elements

With the ongoing investment in sewage treatment capacity in Flanders (Belgium), a new challenge is the management of the rising amount of sludge. Since sludge disposal to agriculture and landfill is regularly becoming very difficult, alternative thermal disposal routes become more important. This paper presents the results of the various co-incineration tests with dried sludge in coal-fired power plants. The aim of this project was to investigate whether adding dried sludge to the combustion process is technically possible, whether the emissions remain below the permitted levels, and whether the quality of residual products remains acceptable. It is concluded that the co-incineration of dried sludge is a valuable and responsible sludge disposal option because it can be carried out in the existing units with a high electrical efficiency. Also, sludge disposal is achieved with a limited influence on emissions and residual ashes, without creating additional waste streams. The main points of attentionare a limitation of the co-incineration rate and the total input of sulphur, chloride and (earth) alkali elements to avoid corrosion and fouling problems.

Comparison of airf low environmental effects on thermal fabrics

2016 ◽  
Vol 88 (2) ◽  
pp. 203-212 ◽  
Author(s):  
Jiahui Tong ◽  
Yuanfang Zhao ◽  
Chenxiao Yang ◽  
Li Li
Keyword(s):  
Thermal Conductivity ◽  
Wind Speed ◽  
Textile Industry ◽  
Heat Dissipation ◽  
Thermal Studies ◽  
Control Process ◽  
Thermal Control ◽  
Heating Process ◽  
The Relationship

Smart thermal textiles are becoming increasingly popular and temperature precision is one of the important targets in their industrialization and commercialization. Some thermal products do not rely on temperature sensors but rather the input electric current pulse to achieve thermal control. In this situation, the surrounding environment, especially ventilation, can greatly affect the thermal control process. Therefore, in this paper, a case study of an apparel system will be provided to study the effect of airflow on the heating process of thermal fabric. The relationship between temperature precision and ventilation is determined when the air flows at any angle to the surface of the thermal fabric. The results show that the thermal conductivity is proportional to the wind speed when the wind speed is high; in contrast, when the wind speed is near to zero, the thermal conductivity of the thermal fabric will not proportionally tend to zero as the result of self-generated heat transfer. This research also shows that the air inflow angle and the wind direction has little effect on the heat dissipation of thermal fabric. This research may generate the data archive and become a valuable reference for future soft thermal studies. It is expected that the developed system will span multidisciplinary gaps and contribute to a new form in a precise and controllable way within the textile industry.

scholarly journals Assessment of the Possibility of Using Hemp Biomass (Cannabis Sativa L.) for Energy Purposes: A Case Study

2019 ◽  
Vol 9 (20) ◽  
pp. 4437 ◽  
Author(s):  
Artur Kraszkiewicz ◽  
Magdalena Kachel ◽  
Stanisław Parafiniuk ◽  
Grzegorz Zając ◽  
Ignacy Niedziółka ◽  
...  
Keyword(s):  
Cannabis Sativa ◽  
Combustion Process ◽  
Chemical Properties ◽  
Physical And Chemical Properties ◽  
Pellet Production ◽  
Physical And Chemical ◽  
Power Boiler ◽  
Biomass For Energy ◽  
And Chemical Properties

During testing, the possibility of using hemp biomass for energy purposes was assessed. The criteria assessed were the physical and chemical properties of hemp biomass, as well as the combustion process of straw and briquettes made of it in a low-power boiler. The results were made and compared with currently applicable standards. Technical and chemical properties of hemp biomass are comparable with the best plants used for energy purposes. Studies have also shown the susceptibility of hemp biomass compaction. However, large emissions recorded during the combustion of the tested forms of biofuels from hemp straw in light of applicable standards disqualify this fuel for use in grate-type heating devices with air fed under the grate. It would be advisable to carry out research on the total costs of pellet production and their use in heating devices with a retort burner, while taking into account this biofuel’s ashes’ susceptibility of sintering.

Application of Heating Line Computation Model in a Shipyard: A Case Study

2008 ◽  
Vol 24 (01) ◽  
pp. 17-24
Author(s):  
JungSeo Park ◽  
JongGye Shin ◽  
YoungBum Kim ◽  
HoKyeong Kim ◽  
SungAm Cho ◽  
...  
Keyword(s):  
Ship Hull ◽  
Computational Time ◽  
Heating Process ◽  
Line Heating ◽  
Know How ◽  
Long Time ◽  
Practical Algorithm ◽  
Doubly Curved ◽  
Geometry And Kinematics

A ship hull is largely made of curved plates, and some of them are doubly curved ones that are not developable. They are formed by the line heating method that has been used for a long time in ship construction. There have been a lot of efforts to automate the line heating process, and a practical algorithm for line heating information was developed. The algorithm, based on differential geometry and kinematics analysis of plates, was efficient in terms of computational time. Up to now, however, its applicability to the real shipyard process has not been evaluated. In this paper, we develop a software framework for heating line computation, test it with real ship hull pieces, and verify that the information from the algorithm matches worker's know-how in practice.

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