What refractory materials can be used in boilers?

June 9, 2019 Off By idswater

What refractory materials can be used in boilers?

Materials in a Boiler Refractory They can be comprised of compounds and minerals such as fireclays, bauxite, silicon carbide, zirconia, chromite, alumina, dolomite, or magnesite. When a refractory is properly made and installed, it can save about 5% to 7% of fuel costs.

How hot can refractory get?

High temperature refractory cements are extreme temperature insulation that can withstand operating temperatures up to 2900°F.

Which are minimum requirements for refractory material?

The material (pure compounds) which are used to make refractory (like MgO, SiC, Fireclay etc.) have high melting point in range of 1800° to 2800 ° C. The material should be able to expand and contract uniformly with temperature change without cracking.

Why is refractory material needed?

Depending on the application, they are subjected to mechanical, thermal and chemical loading. Refractory materials used as furnace linings require a certain minimum strength and creep resistance to ensure that they do not rupture or creep under their own weight.

What are refractory materials examples?

The typical refractory materials include fireclay refractories, high alumina refractories, silica brick, Magnesite refractories, Chromite refractories, Zirconia refractories, Insulating materials and Monolithic refractory.

What are basic refractories?

Refractory material is a material that is resistant to decomposition of heat, pressure or chemical attack and retains strength and form temperatures. The basic refractory materials include alumina, silica, magnesia and lime.

What is high alumina refractory?

High-alumina refractories are made from bauxite, a naturally occurring material containing aluminum hydroxide (Al [OH] 3) and kaolinitic clays. These raw materials are roasted to produce a mixture of synthetic alumina and mullite (an aluminosilicate mineral with the chemical formula 3Al 2 O 3 · 2SiO 2 ).

What is the thermal conductivity of refractory?

Thermal conductivity is a measure of heat transferred across a specific medium. In refractories, thermal conductivity is a function temperature and typically the thermal conductivity is higher at elevated temperatures. In castable refractories, with cementitious bonds, thermal conductivity is also affected by the hydrated calcium aluminate cement.

What is high temp mortar?

High Temperature Mortar. High Temperature Mortar, or Refractory Mortar is used in fireplaces. It is made with high temperature cements and carefully selected aggregates. When it comes to High Temperature Mortar, Shaw Brick offers CPD Stove and Furnace Refractory Cement.

How does tempering affect material?

Tempering, in metallurgy, process of improving the characteristics of a metal, especially steel, by heating it to a high temperature, though below the melting point, then cooling it, usually in air. The process has the effect of toughening by lessening brittleness and reducing internal stresses.