Mechanism Research on Melting Loss of Coppery Tuyere Small Sleeve in Blast Furnace

2016 ◽  
Vol 35 (1) ◽  
pp. 73-80 ◽  
Author(s):  
Yi-Fan Chai ◽  
Jian-Liang Zhang ◽  
Xiao-Jun Ning ◽  
Guang-Yun Wei ◽  
Yu-Ting Chen
Keyword(s):  
Blast Furnace ◽  
Computational Simulation ◽  
Microscopic Analysis ◽  
Circulating Water ◽  
Iron Slag ◽  
Metallurgical Bonding ◽  
Mechanism Research ◽  
And Diffusion ◽  
Slag Erosion ◽  
Great Harm

AbstractThe tuyere small sleeve in blast furnace works under poor conditions. The abnormal damage of it will severely affect the performance of the blast furnace, thus it should be replaced during the damping down period. So it is of great significance that we study and reduce the burnout of tuyere small sleeve. Melting loss is one case of its burnout. This paper studied the reasons of tuyere small sleeve’s melting loss, through computational simulation and microscopic analysis of the melting section. The research shows that the temperature of coppery tuyere small sleeve is well distributed when there is no limescale in the lumen, and the temperature increases with the thickness of limescale. In addition, the interruption of circulating water does great harm to the tuyere small sleeve. The melting loss of tuyere small sleeve is caused by iron-slag erosion, with the occurrence of the melt metallurgical bonding and diffusion metallurgical combination.

scholarly journals Effect of Burn Joss Paper Ash on Properties of Ground-Granulated Blast Furnace-Based Slag Geopolymer

2020 ◽  
Vol 10 (14) ◽  
pp. 4877
Author(s):  
Wen-Ten Kuo ◽  
Chuen-Ul Juang ◽  
Zhi-Rong Chen
Keyword(s):  
Blast Furnace ◽  
Setting Time ◽  
Microscopic Analysis ◽  
Waste Recycling ◽  
Engineering Properties ◽  
X Ray Diffraction ◽  
Granulated Blast Furnace Slag ◽  
Substitution Ratio ◽  
Dry Shrinkage ◽  
Peak Value

The purpose of this study is to make geopolymers using burned joss paper ash (BJPA)—which is used in traditional Chinese festivals—and ground-granulated blast-furnace slag (GGBFS). GGBFS-based geopolymers were replaced by BJPA, by mass, at levels of 0%, 20%, 40%, 60%, 80% and 100% and the liquid-to-solid ratios (L/Ss) were 0.3, 0.4 and 0.5. The properties of fresh, hardening, durability and microscopic analysis were examined to determine the effect of BJPA-substitution ratios and L/S on the engineering properties of composite geopolymers. The results show that among the fresh properties, as the amount of BJPA replacement increases, the setting time tended to increase, but the fluidity slowed down. The maximum compressive strength reached 81.1 MPa. As the amount of BJPA replacement increased, the elastic modulus of the geopolymer increased and the brittleness decreased. However, in the dry shrinkage test, it was found that an increase in BJPA helped reduce the dry shrinkage of the geopolymer. X-ray diffraction analysis revealed that a rise in the BJPA-substitution ratio increased the peak value of calcium carbonate. Scanning electron microscope images showed that microcrack size decreased with an increase in the BJPA-substitution ratio, with maximum and minimum crack sizes of 5.80 μm and 176.8 nm, respectively. This was because BJPA was unable to undergo complete polymerization and therefore was able to fill the cracks produced during the polymerization. In conclusion, BJPA may be used for waste recycling in the production of geopolymers.

Resistance Mechanism of Microbial Fouling in Circulating Water to Bactericide

2011 ◽  
Vol 347-353 ◽  
pp. 931-936
Author(s):  
Mo Jie Sun ◽  
Hong Dan Shi ◽  
Sheng Zheng
Keyword(s):  
Resistance Mechanism ◽  
Water System ◽  
Cooling Water ◽  
Resistance Mechanisms ◽  
Sulfate Reducing ◽  
Circulating Water ◽  
Plant Uses ◽  
Reducing Bacteria ◽  
Great Harm

Microorganisms in circulating water of power plant bring great harm to cooling water system. It not only affects the effect of heat transfer, but also would lead to corrosion of heat exchanger, in seriously would result in shutdown. Now the plant uses the bactericide to treat with the microbial fouling generally, and a variety of fungicides have been developed. However, the long-term usage of fungicide will make the bacteria appear resistance, which greatly limits the application of such measures. This paper overviewed different resistance mechanisms of Pseudomonas, sulfate-reducing bacteria, iron bacteria and slime forming bacteria in the microbial fouling to bactericide and put forward some solutions.

The Mechanism Research on the Refractory Material Corrosion in Material Engineering and its Applications

2012 ◽  
Vol 578 ◽  
pp. 142-145
Author(s):  
Ding Guo Zhao ◽  
Shu Huan Wang ◽  
Xiao Jie Cui ◽  
Jian Long Guo
Keyword(s):  
Blast Furnace ◽  
Amorphous Alloy ◽  
Refractory Material ◽  
Blast Furnace Slag ◽  
Refractory Materials ◽  
Carbide Refractory ◽  
Mechanism Research ◽  
Furnace Slag ◽  
Slag Corrosion ◽  
Silicon Carbide Refractory

The mechanism of refractory material corrosion was analyzed. The laboratory amorphous alloy smelting of the mother prefabricated crucible, reaction process is basically to crucible refractory material of blast furnace slag corrosion, melt corrosion is small. Generally smelting amorphous mother alloy was a difficult thing, and it shown that the basicity was better around 1.0. Compared with quartz refractory, it is good to choose the silicon carbide refractory materials, while smelting amorphous alloy.

scholarly journals Computational Simulation of Exosome Transport in Tumor Microenvironment

2021 ◽  
Vol 8 ◽  
Author(s):  
Roy Koomullil ◽  
Behnam Tehrani ◽  
Kayla Goliwas ◽  
Yong Wang ◽  
Selvarangan Ponnazhagan ◽  
...  
Keyword(s):  
Tumor Microenvironment ◽  
Cancer Cells ◽  
Tumor Cells ◽  
Interstitial Fluid ◽  
Computational Simulation ◽  
Fluid Pressure ◽  
Interstitial Flow ◽  
Release Rates ◽  
Oscillatory Force ◽  
And Diffusion

Cellular exosome-mediated crosstalk in tumor microenvironment (TME) is a critical component of anti-tumor immune responses. In addition to particle size, exosome transport and uptake by target cells is influenced by physical and physiological factors, including interstitial fluid pressure, and exosome concentration. These variables differ under both normal and pathological conditions, including cancer. The transport of exosomes in TME is governed by interstitial flow and diffusion. Based on these determinants, mathematical models were adapted to simulate the transport of exosomes in the TME with specified exosome release rates from the tumor cells. In this study, the significance of spatial relationship in exosome-mediated intercellular communication was established by treating their movement in the TME as a continuum using a transport equation, with advection due to interstitial flow and diffusion due to concentration gradients. To quantify the rate of release of exosomes by biomechanical forces acting on the tumor cells, we used a transwell platform with confluent triple negative breast cancer cells 4T1.2 seeded in BioFlex plates exposed to an oscillatory force. Exosome release rates were quantified from 4T1.2 cells seeded at the bottom of the well following the application of either no force or an oscillatory force, and these rates were used to model exosome transport in the transwell. The simulations predicted that a larger number of exosomes reached the membrane of the transwell for 4T1.2 cells exposed to the oscillatory force when compared to controls. Additionally, we simulated the interstitial fluid flow and exosome transport in a 2-dimensional TME with macrophages, T cells, and mixtures of these two populations at two different stages of a tumor growth. Computational simulations were carried out using the commercial computational simulation package, ANSYS/Fluent. The results of this study indicated higher exosome concentrations and larger interstitial fluid pressure at the later stages of the tumor growth. Quantifying the release of exosomes by cancer cells, their transport through the TME, and their concentration in TME will afford a deeper understanding of the mechanisms of these interactions and aid in deriving predictive models for therapeutic intervention.

scholarly journals Pigments based on blast furnace slag from waste water

2019 ◽  
Vol 109 ◽  
pp. 00025
Author(s):  
Liliya Frolova ◽  
Tetyana Butyrina ◽  
Yurii Galivets
Keyword(s):  
Waste Water ◽  
Blast Furnace ◽  
Chemical Reaction ◽  
Blast Furnace Slag ◽  
Microscopic Analysis ◽  
Degree Of Conversion ◽  
Pigment Dispersion ◽  
Kinetic Characteristics ◽  
High Degree ◽  
Furnace Slag

In this work we prove the possibility of blast furnace slag use as a basis for green, black, brown and orange pigments. We presented kinetic characteristics of the process, as well as the main characteristics of the products obtained. We found that a high degree of conversion is provided by both chemical reaction and adsorption. Through microscopic analysis we identified pigment dispersion. We worked out technological scheme of the process.

Sorption Resistance Studying of Environmentally Friendly Polymeric Materials in Different Liquid Mediums

2021 ◽  
Vol 1038 ◽  
pp. 168-174
Author(s):  
Vladimir Lebedev ◽  
Tetiana Tykhomyrova ◽  
Olesia Filenko ◽  
Anna Cherkashina ◽  
Oleksandr Lytvynenko
Keyword(s):  
Diffusion Coefficient ◽  
Microscopic Analysis ◽  
Environmentally Friendly ◽  
Polymeric Materials ◽  
Coffee Grounds ◽  
Size Stability ◽  
Before And After ◽  
And Diffusion ◽  
Surface Changes

Sorption resistances of environmentally friendly polymeric materials in different liquid mediums are studying in this work. As part of environmentally friendly polymeric materials based on polylactide, OK compost HOME plastic and coffee grounds sorption studying in different liquid mediums, the most stable compositions were identified in terms of size stability and diffusion coefficient. microscopic analysis of new environmentally friendly polymeric materials before and after exposure in operating liquid mediums was made and compositions with the least surface changes were determined.

Research on Surface Low Alloy HSS by Plasma Surface Metallographic W, MO, C Alloying

2007 ◽  
Vol 353-358 ◽  
pp. 1798-1801
Author(s):  
Yuan Gao ◽  
Jin Yong Xu ◽  
Zhong Xu
Keyword(s):  
Diffusion Processes ◽  
Activation Process ◽  
Hydrogen Atoms ◽  
Plasma Surface ◽  
Metallurgical Bonding ◽  
State Diffusion ◽  
The Matrix ◽  
Lower Temperature ◽  
And Diffusion ◽  
Carburizing Process

This research tries to improve the plasma surface W, Mo alloying process by adding inlet methane aside from the original inert gas argon. The carbon and hydrogen particles are incorporated into the ion sputtering, ionization, surface activation and diffusion processes. The W, Mo atoms sputtered from the target diffuse into the surface of the substrate at the same time with the diffusion of carbon atoms. So the synergism of the alloying process and the carburizing process is established in this way. The hydrogen atoms participate the reduction and activation process on the surface of the target and the substrate. The surface HSS combines with substrate via metallurgical bonding and the carbides are all secondary carbides formed at lower temperature during solid state diffusion. These carbides are very soluble to the austenite. This makes the alloy elements fully functional. The carbides with granular shape and distributes homogeneously on the matrix are very fine. No coarse ledeburite eutectic carbide exists. After the co-alloying process of W, Mo, C, direct quench or quench at lower temperature can be applied.

The Reducibility of the Iron Ore Materials as Instrument of the Coke Consumption Decrease in the Blast Furnace Smelting

2013 ◽  
Vol 334-335 ◽  
pp. 375-380 ◽  
Author(s):  
A.N. Dmitriev ◽  
Yu.A. Chesnokov ◽  
Galina Yu. Vitkina
Keyword(s):  
Blast Furnace ◽  
Coke Consumption ◽  
Iron Ore ◽  
Diffusion Processes ◽  
Reduction Kinetics ◽  
Blast Furnace Smelting ◽  
Reduction Of Iron ◽  
Kinetics Of ◽  
And Diffusion ◽  
Furnace Smelting

The technique of defining the minimum coke consumption in blast furnace smelting allows for the calculation of the reserve of coke economy on the basis of thermodynamic principles. In this reserve the constitutive role belongs to the reducibility of the iron ore materials (the agglomerate and pellets). In the present paper, the questions of the reduction kinetics of the iron ore materials and diffusion processes at reduction of iron from its oxides are considered. It is shown that the reducibility of the iron ore materials is the basic reserve of economy the scarce and expensive coke in the blast furnace smelting.

Study on Direct Chill Continuous Casting of 3003/4004 Clad Slab

2012 ◽  
Vol 479-481 ◽  
pp. 318-321
Author(s):  
Zheng Ren ◽  
Xiu Rong Zhu ◽  
Jian Bo Sun ◽  
Jin Jun Tang ◽  
Xin Bing Zhao
Keyword(s):  
Continuous Casting ◽  
Direct Chill ◽  
Test System ◽  
Diffusion Layers ◽  
Metallurgical Bonding ◽  
Electron Microscopes ◽  
Scanning Electron Microscopes ◽  
And Diffusion ◽  
Scanning Electron ◽  
Better Than

The 3003/4004 clad slabs are prepared by direct chill continuous casting. The microstructures on the interface are investigated by optical and scanning electron microscopes, chemical composition distributions across the interface are detected by EPMA, and tensile strengths are evaluated by MTS NEW-810 Materials Test System. The results show that 3003 alloy and 4004 alloy are metallurgical bonding on the interface on the interface, which is results from fusion and diffusion bonding. The thickness of diffusion layers is about 30 μm on average. The tensile strengths of the top, center and bottom regions of the bimetal slab tend to be uniform. The tensile properties of the interface for 3003/4004 clad slab are better than that of 3003 alloy.

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