How do you treat refractory?
One popular product is cured by heating it up to 500°F for about an hour. Another product that is available is cured more slowly, using incremental 50° temperature increases at specific intervals to raise the temperature of the cement, curing it in the process.
Can refractory get wet?
Installation. Careful attention must be paid when adding water and mixing castable materials. Excessive amounts of water can negatively impact the refractory – lower strength, longer set time, and more water that must be removed during dryout.
What is the purpose of boiler refractory?
Boiler refractory is heat-resistant materials that are used to line the boiler to help it retain heat. This prevents thermal loss during boiler operation. It also helps the boiler retain heat even when it is not firing.
What is refractory degradation?
The degradation of refractories used in the construction of glass melting furnaces, whether caused by the action of molten glass, vaporized melt constituents, products of fuel combustion, or by batch dusts and vapors, can normally only be assessed after a campaign when the furnace is partially or completely …
Does refractory cement expand?
This cement has been carefully formulated to withstand thermal expansion and contraction under fluctuating heat conditions.
How do you use refractory cement?
Using a plastic bucket or container, add one quart cool, clean water per 12.5 lbs. dry mix. Only mix an amount that can be used within 20-30 minutes after adding water as cement sets up fast. Mix thoroughly, taking care not to lose any water.
How long does refractory take to dry?
approximately 24 hours
The refractory should be allowed to cure for approximately 24 hours before firing. This is an important time, and the longer you can wait, the better. As with concrete, keep the surface from drying out by covering with a wet cloth or burlap if the weather is hot or dry.
Why refractory dry out is required?
Like all refractory materials, they must be properly dried to achieve their designed strengths. Dry out, also referred to as bake out, is the process for removing both the mechanical water (added during the mixing process) and chemical water (originally added in manufacturing) from the refractory.
What is refractory testing?
Refractory Testing: Refractoriness under load (RUL) / Creep in compression (CIC), Modulus of Rupture (HMOR) The modulus of rupture of refractory ceramics is determined as the amount of force applied to a rectangular test piece of specific dimensions until failure occurs.
What is refractory work?
Refractory jobs involve working with refractory materials and equipment, such as a furnace, broiler, and kiln. A refractory bricklayer or refractory mason also works to build ovens and other structures for containing heated materials such as molten metal. Masons bond bricks or other equipment with specialized mortar.
How many types of refractory are there?
Refractory materials are classified into three types based on fusion temperature (melting point).
Which is a basic refractory?
The basic refractory materials include alumina, silica, magnesia and lime.
What is refractory dryout?
Refractory dryout is the controlled process of applying heat to a refractory lining to remove water from the lining system without causing damage to the refractory materials. Whenever linings are heated up from ambient temperatures, whether it be the initial heatup after a new lining installation or a subsequent
What is the best way to dry out a refractory?
Keep open all the vent lines ( 100% open) on the boiler drum, top super heater header throughout the refractory dry out period. Refractory baking and dry out cycle requires very slow and controlled heating of refractory as recommended by the refractory manufacturers.
How to maintain the refractory baking and dry out cycle?
Keep open all the vent lines ( 100% open) on the boiler drum, top super heater header throughout the refractory dry out period. Refractory baking and dry out cycle requires very slow and controlled heating of refractory as recommended by the refractory manufacturers. Thermal stresses will be produced if heating rate is too rapid.
What is boiler refractory dry out procedure?
Boiler refractory dry out procedure. Boiler Refractory dry out is to ensure proper drying, curing of refractory applied on furnace and other components. The refractory usually undergoes considerable chemical changes, during initial heating.