Development and Testing of a High Thermal Conductivity Refractory Tile System in a Waste-to-Energy Combustion Unit

2007 ◽  
Author(s):  
Patrick M. Stephan
Keyword(s):  
Thermal Conductivity ◽  
High Temperature ◽  
Tube Wall ◽  
Radical Change ◽  
High Thermal Conductivity ◽  
Waste To Energy ◽  
Refractory Materials ◽  
Tile System ◽  
Tile Systems ◽  
New System

Refractory systems are used for tube wall protection in waste-to-energy (WTE) boilers. Through the years, continuous adjustments have been made to the refractory materials and product designs. Design modifications have incrementally improved tile systems from bolt-on to hidden-clip to back-cast systems. Different refractory types, such as gunning cements and other monolithics, have also been used with varying degrees of success. A new refractory system is currently evolving, borrowed from other advanced high temperature applications and adapted to fit WTE boiler designs. This new system is a radical change in design from conventional refractory systems.

Development Strategy of Insulation Macromolecular Composite Materials

2011 ◽  
Vol 391-392 ◽  
pp. 328-331
Author(s):  
Yong Peng Yu
Keyword(s):  
Thermal Conductivity ◽  
High Temperature ◽  
Development Strategy ◽  
Cooling System ◽  
High Thermal Conductivity ◽  
Nano Particles ◽  
Insulation Material ◽  
Foreign Companies ◽  
The Status ◽  
Insulation Systems

The status and progress of high pressure resistant insulation material at home and abroad were reviewed from aspects like high thermal conductivity, high temperature resistance, environ-mental protection and modification of nano-particles. High thermal conductivity insulation materials can improve the efficiency of cooling system and decrease the energy loss of electric machines. Some famous foreign companies keep ahead in this field. Current domestic high temperature resistant solvent less insulating varnish can only be used in small and medium sized generators instead of high voltage generators. Therefore this kind of material should be improved in either resin rich or resin less insulation systems.

scholarly journals High-Temperature Strength Property of VGCF-Al Composite Materials Having High Thermal Conductivity

2011 ◽  
Vol 77 (779) ◽  
pp. 1037-1040
Author(s):  
Kohei FUKUCHI ◽  
Katsuhiko SASAKI ◽  
Terumitsu IMANISHI ◽  
Kazuaki KATAGIRI ◽  
Akiyuki SHIMIZU ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
High Temperature ◽  
Composite Materials ◽  
Strength Property ◽  
High Thermal Conductivity ◽  
High Temperature Strength ◽  
Al Composite

AMPCOLOY 944

Alloy Digest ◽  
2010 ◽  
Vol 59 (7) ◽  
Keyword(s):  
Thermal Conductivity ◽  
High Temperature ◽  
Physical Properties ◽  
Tensile Properties ◽  
High Thermal Conductivity ◽  
Temperature Performance

Abstract Ampcoloy 944 was developed for plastic tooling and has a hardness greater than 285 HB, a high thermal conductivity, with good machinability and polishability. This datasheet provides information on composition, physical properties, hardness, and tensile properties. It also includes information on high temperature performance as well as forming and machining. Filing Code: CU-785. Producer or source: AMPCO Engineered Alloys.

scholarly journals Behavior of Two Foundry Cobalt-Based Alloys Exposed to a Hot Complex Gaseous Mixture Simulating the Atmosphere in a Waste-to-Energy Boiler. Part 1: Case of the Alloy Exposed to the Complex Gas Stream

2018 ◽  
Vol 5 ◽  
pp. 1-5
Author(s):  
Lionel Aranda ◽  
Thierry Schweitzer ◽  
Patrice Berthod ◽  
Christophe Rapin ◽  
Didier Souchon ◽  
...  
Keyword(s):  
Water Vapor ◽  
High Temperature ◽  
Working Conditions ◽  
Gaseous Mixture ◽  
The Other ◽  
Waste To Energy ◽  
Gas Mixture ◽  
Refractory Materials ◽  
X Ray Diffraction ◽  
X Ray

The refractory materials required for waste-to-energy boilers endure severe working conditions, such as exposure to heat and hot oxidation / corrosion. Thanks to their high temperature properties cobalt-based alloys may respond to these properties requirements. In this work two model alloys based on cobalt and rich in chromium were elaborated by casting and samples were prepared by cutting and polishing. These samples were exposed, one to a hot complex gaseous mixture particularly aggressive reproducing the atmosphere in WtE boilers in service (presence of water vapor, di-oxygen, carbon di-oxide, hydrogen chloride), and the other to synthetic ashes, both for more than two hundreds hours. After test the samples were characterized by X-ray diffraction and SEM observations. On sample exposed to the complex gas stream a {10 to 15μm}-thick oxide scale formed on the surface of the sample exposed to the gas mixture. It involved all the elements of the alloy and it obviously developed both inwards and outwards as suggested by the position of the oxidized carbides.

Inorganic Insulated Metal Substrates

2015 ◽  
Vol 2015 (HiTEN) ◽  
pp. 000219-000226
Author(s):  
Pavel Shashkov ◽  
Steven Curtis ◽  
Giles Humpston
Keyword(s):  
Thermal Conductivity ◽  
Grain Size ◽  
High Temperature ◽  
Critical Role ◽  
Cost Effective ◽  
High Thermal Conductivity ◽  
Ceramic Surface ◽  
Metal Base ◽  
Dielectric Thickness ◽  
Metal Substrates

Insulated metal substrates (IMS) are gaining ground in electronics applications thanks to their high thermal conductivity and low cost. However, the organic dielectrics (such as epoxy or polyimide based material) traditionally used on IMS are limited by their maximum operating temperature, generally to below 150–200 °C. Thus in high temperature applications manufacturers are restricted to using expensive inorganic substrates such as alumina (Al2O3), aluminium nitride (AlN) or silicon nitride (Si3N4). A cost-effective IMS with an inorganic dielectric would be an attractive alternative for high temperature electronics. Cambridge Nanotherm has developed an electrochemical process for building inorganic dielectric ceramic onto a metal base. Nanotherm ceramic material is nanocrystalline alumina with a grain size of 20 to 60 nanometres. This grain size plays a critical role in providing the dielectric layer with its unique combination of properties such as high thermal conductivity (6–7 W/mK), high dielectric strength (>50 V/um) and formability when applied on thin, foil-type substrates. The Nanoceramic layer can be built from 3 to 50 microns thick, depending on the breakdown voltage required. This avoids excessive dielectric thickness that unnecessarily increases the thermal resistance of the system. The electric circuit is built onto the ceramic surface using either PVD metal sputtering followed by galvanic metal build up or conventional thick film processing. The result is a cost-effective, easy to process and use inorganic substrate with a thermal conductivity around 150 W/mK and a maximum working temperature above 350 °C. This paper will present an overview of the key electrical and thermal properties of Nanoceramic aluminium substrates and their manufacturing process. Potential use in the thermal management of high temperature electronic devices will be discussed with reference to some applications.

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