Research on the Water Wall Material Selections of USC Boiler With 700°C Steam Parameter

2014 ◽  
Author(s):  
Wang Chongbin ◽  
Xu Xueyuan ◽  
Yao Danhua ◽  
Lu Zhengran ◽  
Zhu YuFeng ◽  
...  
Keyword(s):  
Material Selection ◽  
Wall Material ◽  
Materials Properties ◽  
Water Wall ◽  
Wall Panels ◽  
Wall Materials ◽  
Steam Parameter

This paper discusses the materials properties of candidate water wall materials for USC boiler with 700°C steam parameter, and analyzes the serviceability of water wall panels made of different tubes, such as T12, 12Cr1MoVG, T23, T24, T91, T92, T122(HCM12A), VM12, 617 and 617 mod. In addition, some suggestions and optimization measures on the material selection have been proposed. Paper published with permission.

scholarly journals Development of bioactive/active additives based on essential oils: A review

2020 ◽  
Vol 3 (4) ◽  
pp. 60-67
Author(s):  
Jessica Alarcón-Moyano ◽  
◽  
Silvia Matiacevich ◽  
Keyword(s):  
Medicinal Plants ◽  
Essential Oil ◽  
Essential Oils ◽  
Freeze Drying ◽  
The Other ◽  
Wall Material ◽  
Oil Oxidation ◽  
Active Additive ◽  
Wall Materials ◽  
Selection For

The use of bioactive/active additives has been increasing in recent years, especially those derived from medicinal plants such as essential oils. However, due to essential oil oxidation it is necessary to protect it by encapsulation techniques such as: emulsion, spray- and/or freeze-drying as the most economical techniques. On the other hand, an important factor is to determine the appropriate wall material to obtain a prolonged or controlled release in the food or in the organism. Therefore, several factors affect the release of the compounds such as the type, amount of wall material and/or combination of wall materials. Therefore, the knowledge of all the aforementioned factors is important in order to make an adequate selection for the development of a bioactive/active additive based on essential oils.

scholarly journals Neutrons along the labyrinth of high energy medical accelerators: Effect of wall materials

2019 ◽  
Vol 21 ◽  
pp. 169
Author(s):  
M. Fakinou ◽  
I. E. Stamatelatos ◽  
J. Kalef-Ezra
Keyword(s):  
Monte Carlo ◽  
Cost Effective ◽  
High Energy ◽  
Wall Material ◽  
Mcnp Code ◽  
Dose Equivalent ◽  
Concrete Wall ◽  
Ambient Dose Equivalent ◽  
Wall Materials ◽  
Ambient Dose

Neutron streaming along the labyrinth of a generic bunker of an 18MV medical accelerator was evaluated. Monte Carlo simulations using MCNP code were performed to calculate neutron ambient dose equivalent along the labyrinth. The effect of plain, borated and barites concrete wall material, as well as borated concrete and plywood (Celotex), as neutron absorbing wall liners, was examined. The results of the study suggest that plywood can provide a cost effective material to attenuate neutron streaming along the labyrinth.

scholarly journals PRINCIPLES OF SUSTAINABLE ARCHITECTURE IN THE PRODUCTION OF BAMBOO WOVEN WALL MATERIALS (DENDROCALAMUS ASPER)

SINERGI ◽  
2020 ◽  
Vol 24 (1) ◽  
pp. 57
Author(s):  
Muhammad Zakaria Umar ◽  
Muhammad Arsyad ◽  
Santi Santi ◽  
Arman Faslih
Keyword(s):  
Qualitative Approach ◽  
Wall Material ◽  
New Materials ◽  
Case Study Method ◽  
Sustainable Architecture ◽  
Sustainable Building ◽  
Human Energy ◽  
Wall Materials ◽  
The City

Bamboo is a sustainable building material because the use of new materials is sustainable. In the City of Kendari, there are still craftsmen of bamboo woven wall material. This research is important to do because to reveal how to make bamboo woven wall material by local craftsmen in Kendari and to find out the pattern of making bamboo woven wall material against the principles of sustainable architecture. This research is aimed at identifying and reviewing work tools, work materials, and how to make bamboo woven wall material against the principles of sustainable architecture by local craftsmen in Kendari City. This study uses a case study method with a qualitative approach. This study concluded that the principles of sustainable architecture in bamboo woven wall materials are as follows: working tools are used simply to reduce the use of new materials, the materials for making come from vegetation grown so that the location and natural resource ecosystems are sustainable, and how to make use of human energy so that it saves energy.  

Papercrete and Recipanel as Wall Material: An Environmental Sustainability Review

2021 ◽  
Vol 23 (2) ◽  
pp. 147-156
Author(s):  
Annisa Widya Pangestika ◽  
Ova Candra Dewi ◽  
Nisrina Dewi Salsabila
Keyword(s):  
Environmental Sustainability ◽  
Waste Recycling ◽  
Wall Material ◽  
Economic Aspects ◽  
Environmental Aspects ◽  
Bottom Line ◽  
Recycled Paper ◽  
Theoretical Understanding ◽  
Wall Materials ◽  
The Relationship

This study aims to review the relation between papercrete and recipanel (wall materials from recycled paper) with indicators of material sustainability in environmental aspects. Recycling paper into wall material is one of the ways to overcome the increasing amount of paper waste in Indonesia. Waste recycling is related to the concept of sustainability, namely the triple bottom line of the concept of sustainability. A literature review of waste management, recycled paper, and recycled paper as wall material were conducted in terms of environmental sustainability. This study was conducted by integrating the theoretical understanding of waste, walls, wall material products from recycled paper and discussion of its impact in terms of the sustainability of recycled paper as alternative wall material. From this study, it was found that the relationship between the characteristics of papercrete and walls on the sustainability of recycled paper brought forward four positive values and two negative values. Meanwhile, the relation between recipanel and wall characteristics on the sustainability of recycled paper carries four positive values and two negative values. Thus, the recycled paper used as wall material with examples of papercrete and recipanel products may still be suitable for use as wall material in Indonesia. Suggestions resulted from this study that might be implemented in the future are to increase the durability of materials derived from recycled paper and to conduct studies that discuss wall materials derived from recycled paper from social and economic aspects in terms of sustainability.

scholarly journals Microencapsulation of Lemongrass (Cymbopogon citratus) Essential Oil Via Spray Drying: Effects of Feed Emulsion Parameters

Processes ◽  
2020 ◽  
Vol 8 (1) ◽  
pp. 40 ◽  
Author(s):  
Nguyen Phu Thuong Nhan ◽  
Vo Tan Thanh ◽  
Mai Huynh Cang ◽  
Tri Duc Lam ◽  
Nguyen Cam Huong ◽  
...  
Keyword(s):  
Essential Oil ◽  
Essential Oils ◽  
Spray Drying ◽  
Gum Arabic ◽  
Core Material ◽  
Wall Material ◽  
Cymbopogon Citratus ◽  
Encapsulation Process ◽  
Wall Materials ◽  
Lemongrass Essential Oil

The purpose of this study was to attempt the encapsulation of lemongrass (Cymbopogon citratus) essential oil utilizing spray drying technique. An array of process parameters including concentration of wall (15–30%), type of wall materials (maltodextrin, maltodextrin and gum Arabic mixture), and concentration of essential oil (0.5–2.0%) were thoroughly investigated. The results show that the use of sole maltodextrin as encapsulant gave microcapsules characteristics comparable to that of powder produced using maltodextrin and gum Arabic mixture. The encapsulation process that was performed with maltodextrin at the concentration of 30% as wall material and lemongrass essential oil at the concentration of 1.5% as core material showed highest drying yield (84.49%), microencapsulation yield (89.31%) and microencapsulation efficiency (84.75%). Encapsulated essential oils retained most of their major constituents in comparison with the bare essential oils without any significant compromise in product quality.

scholarly journals METHOD OF PREDICTION OF THERMAL CONDUCTIVITY COEFFICIENT OF WALL MATERIALS CONTAINING SALTS / SIENŲ DRUSKINGŲ MEDŽIAGŲ ŠILUMOS LAIDUMO KOEFICIENTO PROGNOZĖS METODAS

2011 ◽  
Vol 17 (1) ◽  
pp. 108-114
Author(s):  
Marta Kosior-Kazberuk ◽  
Valeriy Ezerskiy
Keyword(s):  
Thermal Conductivity ◽  
Data Mining ◽  
Cluster Analysis ◽  
Porous Structure ◽  
Thermal Conductivity Coefficient ◽  
Wall Material ◽  
Corrective Factor ◽  
Real Value ◽  
Service Conditions ◽  
Wall Materials

The salt presence in porous structure of wall materials causes changes in thermal conductivity. The real value of material thermal conductivity in service conditions is necessary for engineering applications. The method of prediction of the thermal conductivity coefficient for wall materials containing salt using corrective factor is presented in the paper. By means of corrective coefficients, for well-known content of moisture and salt in wall material, it is possible to calculate thermal conductivity coefficient with regard to the presence of specific salt or mix of salts in material. The corrective coefficient values were determined for different groups of salts. The partition of salts into groups was made by means of cluster analysis, in dependence on their influence on material thermal conductivity. Clustering, in data mining, is a useful tool for discovering groups and identifying interesting distributions in the underlying data. Santrauka Druskos poringųjų medžiagų sienų struktūroje sukelia jų šilumos laidumo kitimą. Tikroji eksploatacinė medžiagų šilumos laidumo koeficiento vertė būtina atliekant inžinerinius tyrimus. Straipsnyje pristatomas sienų, kurių medžiagos turi druskų, šilumos laidumo koeficiento prognozės metodas naudojant pataisos daugiklį. Naudojant pataisos koeficientus, esant tiksliai žinomam drėgmės ir druskų kiekiui sienos medžiagoje, galima apskaičiuoti šilumos laidumo koeficientą, atsižvelgus į tam tikrų druskų ar jų mišinių buvimą medžiagoje. Buvo nustatytos įvairių druskų grupių pataisos koeficientų vertės. Druskos buvo paskirstytos grupėmis pagal klasterinę analizę, priklausomai nuo jų įtakos medžiagos šilumos laidumui. Klasterių metodas yra naudinga priemonė duomenims apdoroti—grupėms atskleisti ir įdomiems duomenų pasiskirstymams rasti.

Updated Case Study of Fireside Corrosion Management in an RDF Fired Energy-From-Waste Boiler

2010 ◽  
Author(s):  
Stephen Vrchota ◽  
Tim Peterson
Keyword(s):  
High Temperature ◽  
Material Selection ◽  
Cost Effective ◽  
Fireside Corrosion ◽  
Alloy 625 ◽  
Water Wall ◽  
Refuse Derived Fuel ◽  
Corrosion Resistant Alloy ◽  
Energy From Waste

Fireside corrosion management in energy-from-waste (EfW) boilers is the leading cost of boiler maintenance. The combustion of refuse-derived fuel (RDF) processed from municipal solid waste in a boiler for power generation produces a very corrosive environment for boiler tube materials. Water wall corrosion has been greatly reduced by the use of Alloy 625 overlay in the highest corrosion areas. This paper will describe the progression of water wall corrosion up the boiler walls and novel attempts to reduce this problem. This paper presents an updated case study conducted at the Great River Energy plant in Elk River, MN from 2003–2009 on corrosion management. Areas to be addressed are protection of exposed carbon steel water wall tubes, management of Alloy 625 weld overlay on the water walls and corrosion in the high temperature superheat sections. Methods for testing and maintaining the corrosion resistant Alloy 625 cladding are reviewed. High temperature superheat material selection and shielding are reviewed with information leading to a cost effective solution that requires superheat replacement every three years with very few tube failures between replacements.

scholarly journals FATIGUE AND CORROSION PHENOMENON ON FAILURE OF WATER WALL TUBE BOILER

2020 ◽  
Vol 14 (1) ◽  
pp. 29-38
Author(s):  
Eka Febriyanti ◽  
Amin Suhadi ◽  
Laili Novita Sari
Keyword(s):  
Chemical Analysis ◽  
Tensile Test ◽  
Fatigue Fracture ◽  
Material Selection ◽  
Hardness Test ◽  
Root Cause ◽  
Water Wall ◽  
Cause Of Failure ◽  
As Stress ◽  
Water Wall Tube

Water wall tube is one of a boiler components which has a function to transform water to be vapour so that it is normally called steam generating tubes. Any failure on wall tube will affect to the whole boiler system.  The purpose of this research is to find out root cause of failure of wall tube in order to avoid similar case in the future.  Research is conducted by examining and testing the specimens on all aspects including visual, fractography, metallography, chemical analysis, hardness test and tensile test. Examination on the fracture surface by fractographic method found the evidence of fatigue fracture with the presence of beachmark. Another examination on uninstalled boiler tube shows indication of fabrication defect and trans-granular cracks which allowed corrosive agent infiltrated into the microstructure of the tube. However, the result of chemical analysis and tensile test indicated that the tubes investigated are in accordance with ASTM A 210 Grade C specifications. Therefore, the failure of the tube is not caused by wrong material selection, but through the combination of fatigue fracture and corrosion attack where initiated at fabrication defect that acted as stress raisers.

scholarly journals Effect of Dextrose Equivalent on Maltodextrin/Whey Protein Spray-Dried Powder Microcapsules and Dynamic Release of Loaded Flavor during Storage and Powder Rehydration

Foods ◽  
2020 ◽  
Vol 9 (12) ◽  
pp. 1878
Author(s):  
Kaixin Li ◽  
Bowen Pan ◽  
Lingjun Ma ◽  
Song Miao ◽  
Junfu Ji
Keyword(s):  
Relative Humidity ◽  
Whey Protein ◽  
Food Systems ◽  
Protein Isolate ◽  
Core Material ◽  
Wall Material ◽  
Dextrose Equivalent ◽  
Flavor Release ◽  
Wall Materials ◽  
Spray Dried

The preparation of powdered microcapsules of flavor substances should not only protect these substances from volatilization during storage but also improve their diffusion during use. This study aimed to investigate the effects of maltodextrin (MD) with different dextrose equivalent (DE) values on retention of flavor substances during storage, and the dynamic release of flavor substances during dissolution. MDs with three different DE values and whey protein isolate were mixed in a ratio of 4:1 as wall materials to encapsulate ethyl acetate, and powdered microcapsules were prepared by spray drying. It was proved that MD could reduce the diffusion of flavor substances under different relative humidity conditions through the interaction between core material and wall material. During dissolution, MD released flavor substances quickly owing to its superior solubility. The reconstituted emulsion formed after the powder dissolved in water recaptured flavor substances and made the system reach equilibrium. This study explored the mechanism of flavor release during the storage and dissolution of powder microcapsules and should help us understand the application of powder microcapsules in food systems.

Wall Material Selection for Encapsulation by Spray Drying

2013 ◽  
Vol 2 (2) ◽  
pp. 86-92 ◽  
Author(s):  
Ana S. Prata ◽  
Lorena Garcia ◽  
Renata V. Tonon ◽  
Miriam D. Hubinger
Keyword(s):  
Spray Drying ◽  
Material Selection ◽  
Wall Material ◽  
Selection For
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