scholarly journals Influence of Temperature Control of Coke Oven on Life Cycle of Refractories

2021 ◽  
Vol 2076 (1) ◽  
pp. 012089
Author(s):  
Hongming Fang ◽  
Likai Qu ◽  
Shijie Wang ◽  
Jun Han ◽  
Xiaoxiong Wu ◽  
...  
Keyword(s):  
Heating Rate ◽  
Molecular Diffusion ◽  
Coke Oven ◽  
Volume Effect ◽  
Effective Control ◽  
Quartz Content ◽  
Construction Period ◽  
Oven Drying ◽  
Construction Schedule ◽  
Heating Up

Abstract Different stages of the oven drying are analyzed by the theory of molecular diffusion and crystal change in oven drying process. It’s pointed that in order to ensure uniform expansion and gray seam integrity, the speed of spreading to the outside about within water should be in accordance with the speed of evaporation about surface moisture in the drying period, heating up too quickly will easily lead to extending drying period and destroying masonry rigor. The expansion of silica brick is mainly from the volume effect form with the transition between the allotrope in the expansion period, the heating rate of crystal transformation point must be strictly controlled. At the same time, quartz content should be higher, lesser residual quartz content will be better. The hot state engineering period is consistent with the construction schedule, the construction sequence can’t be reversed, and it is not recommended at this stage to extend the construction period. Effective control of the heating rate of the three stages above lays a solid foundation to extend the oven life.

Effect of Heating Rate on Sintered Microstructure of W-Cu Nanocomposite Powder Produced Using W-CuO Mixture

2004 ◽  
Vol 449-452 ◽  
pp. 1125-1128
Author(s):  
Dae Gun Kim ◽  
Gil Su Kim ◽  
Jin Chun Kim ◽  
Sung Tag Oh ◽  
Young Do Kim
Keyword(s):  
Heating Rate ◽  
Nanocomposite Powder ◽  
Lower Heating Rate ◽  
Nanocomposite Powders ◽  
Heating Up ◽  
Lower Heating

The sintered microstructure homogeneity of W-15wt%Cu nanocomposite powders prepared from W-CuO mixture was investigated. The increment of heating rate considerably affected the homogeneity of sintered microstructure. In case of the higher heating rate, the microstructure was more homogeneous than that of the lower heating rate by reason of Cu- exudation during heating-up process.

scholarly journals Effects of heating rate and heating up time to central biomass particles for bio-oil production

2016 ◽  
Vol 51 (1) ◽  
pp. 13-22
Author(s):  
MB Ahmed ◽  
ATMK Hasan ◽  
M Mohiuddin ◽  
M Asadullah ◽  
MS Rahman ◽  
...  
Keyword(s):  
Heating Rate ◽  
Particle Temperature ◽  
Product Distribution ◽  
Heating Rates ◽  
Final Temperature ◽  
Central Mass ◽  
Bio Oil ◽  
Reactor Temperature ◽  
Biomass Particles ◽  
Heating Up

Objective of this work was to pyrolysis woody biomass. Experiments were carried out at 300 to 500oC. Relatively bigger particles were used. Special emphasis was given to investigate the effects of heating rate and heating up time of the central mass of the particles on the product distribution. Surface temperature reached to the reactor set temperature immediately while the temperature at the central part was as low as 50oC. The center temperature gradually increased to the final temperature within 3 to 8 minutes, depending on the wood types and the reactor set temperature. For ipil-ipil wood the heating rate of the central mass was much faster than krishnachura and koroi woods, and thus the heating up time was lower. Ipil-ipil wood was experienced higher yield (65%) even at lower reactor temperature 300oC with particle temperature 450oC. In the case of krishnachura and koroi woods, the bio-oil yields were lower under the same condition due to the heating rates of the central parts were much slower. Further researchon different biomasses may be necessary to demonstrate overall process.Bangladesh J. Sci. Ind. Res. 51(1), 13-22, 2016

scholarly journals Prediction of Climate Risk Management in Infrastructure Projects

2019 ◽  
Vol 8 (11S2) ◽  
pp. 268-272
Keyword(s):  
Risk Management ◽  
Construction Projects ◽  
Climate Risk ◽  
Annual Number ◽  
Project Schedule ◽  
Risk Environment ◽  
Construction Period ◽  
History Of ◽  
Construction Schedule ◽  
The Impact

Risk Management in Construction Project is playing important role to achieve successes of the Project. Risk is in everywhere and every project particularly in construction has innumerable risks occurring before construction and during construction period. Most of the risks are repeatedly occurring but the impact & probability of risk is varying. However, the climate risk may lead to impact the Time, Cost and losing an opportunity Cost of the project. This study is to create a model for risk data collection, risk analysis, risk interpretation with the combination of project schedule and cost, India climate is varying from states to states especially the annual number of raining days different from 10 to 130 days throughout India and its impact the construction schedule 3% to 36% on average, Temperature is verifying for winter (0C to 25C) and summer (25C to 50C) is also impact the productivity of project this will reflected in the Project Cost 1% to 10% on average. The History of Climate we can identify the Climate Risk, Environment Risk, impact the time and Cost. However, this paper is measuring and handling risks to help for upcoming construction projects.

scholarly journals Transient Liquid Phase Sintering of PM Steel—A Matter of the Heating Rate

Metals ◽  
2021 ◽  
Vol 11 (10) ◽  
pp. 1662
Author(s):  
Stefan Geroldinger ◽  
Raquel de Oro Calderon ◽  
Christian Gierl-Mayer ◽  
Herbert Danninger
Keyword(s):  
Liquid Phase ◽  
Heating Rate ◽  
Transient Liquid Phase ◽  
Liquid Phase Sintering ◽  
Alloying Elements ◽  
Heating Rates ◽  
Different Temperatures ◽  
Transient Liquid Phase Sintering ◽  
Heating Up ◽  
Cct Diagrams

Powder metallurgy (PM) offers several variants to introduce alloying elements for establishing the desired final composition. One route is the master alloy (MA) approach. The composition and the elements contained in the MA can be adjusted to obtain a liquid phase that penetrates through the interconnected pore network and thus enhances the distribution of the alloying elements and the homogenization of the microstructure. Such a liquid phase is often of a transient character, and therefore the amount of liquid formed and the time the liquid is present during the sintering are highly dependent on the heating rates. The heating rate has also an impact on the reaction temperatures, and therefore, by properly adjusting the heating rate, it is possible to sinter PM-steels alloyed with Fe-Cr-Si-C-MA at temperatures below 1250 °C. The present study shows the dependence of the melting regimes on the heating rate (5, 10, 20, 120 K/min) represented by “Kissinger plots”. For this purpose, liquid phase formation and distribution were monitored in quenching dilatometer experiments with defined heating up to different temperatures (1120 °C, 1180 °C, 1250 °C, 1300 °C) and subsequent quenching. Optimum sintering conditions for the materials were identified, and the concept was corroborated by C and O analysis, CCT diagrams, metallographic sections, and hardness measurements.

scholarly journals Multiobjective Construction Optimization Model Based on Quantum Genetic Algorithm

2019 ◽  
Vol 2019 ◽  
pp. 1-8 ◽  
Author(s):  
Wei He ◽  
Yichao Shi
Keyword(s):  
Genetic Algorithm ◽  
Optimization Model ◽  
Construction Project ◽  
Revolving Door ◽  
Effective Control ◽  
Pareto Solution ◽  
Construction Period ◽  
Quantum Genetic Algorithm ◽  
Control Decision ◽  
Construction Optimization

It is critical for the construction party to meet the established economic and social demand for the construction project with the shortest construction period and the lowest cost. In this study, the construction characteristics of the project were analyzed. In addition, the multiconstraint and multitarget construction optimization model with minimum period and cost was established based on the quantum genetic algorithm. In order to improve the adaptability of the quantum genetic algorithm for the multiobjective model, the encoding form, quantum revolving door, and genetic flow of the algorithm were reconstructed. MATLAB 2016b was used as the simulation platform, and the implementation of the algorithm was improved according to the characteristics of the variables in the construction project, including period and cost. Finally, the optimization of the algorithm was verified and analyzed by an engineering example. The results showed that using the multiobjective quantum genetic algorithm, the optimal duration/cost can be achieved and the most reasonable and effective control decision scheme for the construction management can be provided through the Pareto solution set.

Numerical Simulation of a Coke Oven

2012 ◽  
Vol 479-481 ◽  
pp. 586-589
Author(s):  
Dan Dan Hao ◽  
Wen Sheng Liu ◽  
Le Ping Dang ◽  
Hong Yuan Wei
Keyword(s):  
Heat Transfer ◽  
Numerical Simulation ◽  
Temperature Distribution ◽  
Heating Rate ◽  
Wall Temperature ◽  
Coke Oven ◽  
Furnace Wall ◽  
Important Approach ◽  
Simulation Results ◽  
Char Structure

At present, the CFD numerical simulation, combined with an experiments involving heat transfer has become an important approach to studying coal carbonization. The aim of this paper is to illustrate how a standard CFD package may be modified so it can be used to simulate temperature distribution, coking time and carbonization processes that occur in coke oven charge. Content of volatile matters and moisture have important influence on heating rate during carbonization. Further, heating rate have effects on char structure an inner coking condition, as well as the carbonization time. In addition, furnace wall temperature have important effects on carbonization, because they can change the coking time. Our simulation results for the coke oven model are in agreement with experimental and virtual data.

The Risk Management Method for Project Schedule of Aerospace Engineering

2013 ◽  
Vol 712-715 ◽  
pp. 3165-3168
Author(s):  
Chao Hui Wang ◽  
Jun Lu
Keyword(s):  
Risk Assessment ◽  
Risk Management ◽  
Aerospace Engineering ◽  
Project Schedule ◽  
Construction Period ◽  
Management Method ◽  
Construction Schedule ◽  
Engineering Projects ◽  
Risk Assessment And Analysis ◽  
Huge Investment

Aerospace engineering projects usually require a huge investment and a long construction period. For this reason, a risk management method is proposed for the project schedule of aerospace engineering. In total, it is necessary to make a risk assessment and analysis on construction schedule before project implementation.

Key Technical Issues and Optimization Analysis on Temperature Control and Crack Prevention Measures for Xiluodu Super-High Arch Dam during the Construction Period

2014 ◽  
Vol 584-586 ◽  
pp. 2043-2051
Author(s):  
You Zhi Liu ◽  
Guo Xin Zhang ◽  
Ping Yang ◽  
Shao Wu Zhou
Keyword(s):  
Simulation Analysis ◽  
Arch Dam ◽  
Control Measures ◽  
Effective Control ◽  
Engineering Practice ◽  
Prevention Measures ◽  
High Arch Dam ◽  
Safety Control ◽  
Construction Period ◽  
Transverse Joint

By utilizing the transverse joint opening and closing iteration technique and the finite element method based on the discontinuous deformation theory for manifolds, and with the help of measured data in situ of temperature, stress and displacement and so on during the construction period, the dynamic tracing feedback simulation/analysis was carried out to the temperature field and the stress field. On this basis, a series of effective safety control measures and methods were systematically put forward, which are beneficial to safety construction in the high temperature season and winter, improvement of the safety coefficient for restrained zones, lowering the cracking risk of low gradation concrete in portholes, ensuring the transverse joints aperture and groutability as well as effective control of the cantilever height and so on; and good effects have been obtained in the engineering practice and the important guarantee may be provided for the overall safety of Xiluodu Super-high arch dam.

scholarly journals Study on Hydrologic Forecasting at the Construction Period of Datengxia Hydroproject

2020 ◽  
Vol 383 ◽  
pp. 93-97
Author(s):  
Kangming Lu
Keyword(s):  
Practical Work ◽  
Pearl River ◽  
Work Experiences ◽  
River Diversion ◽  
Construction Period ◽  
Flood Season ◽  
Forecasting Methods ◽  
The Pearl River ◽  
Under Construction ◽  
Construction Schedule

Abstract. To provide better service of hydrologic forecasting in the construction period of Datengxia Hydroproject that is the largest one under construction on the Pearl River, this paper focuses in analysing the characteristics of the regional floods, and reviewing the hydrologic forecasting work since starting construction, and discussing the hydrologic forecasting methods of the period not only the river closure but also the initial filling. The paper presents some practical work experiences and suitable forecasting methods on the basis of the construction schedule and the river diversion schemes. The study will conducive to improve our service ability of hydrologic forecasting and provide the important technical support of safe construction during the flood season.

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