Fire-resistant brick is a brick intended for the interior lining of stoves , fireplaces , chimneys and chimneys . Used refractory bricks are called refractory scrap and are used in processing.
Fire bricks are used to isolate fire . Refractory bricks form a shell that protects the kiln from direct fire or hot coals, so they must be distinguished:
- heat resistance - a brick must withstand prolonged heating to a temperature of 1000 ° C without loss of strength
- high temperature resistance - a brick must withstand a great deal of heat and cooling without loss of strength
- low thermal conductivity - the brick must retain heat inside the stove or fireplace
But in fact, chamotte brick has a high thermal conductivity coefficient (0.5-0.85 W / m hail), approximately equal to red full-bodied brick (0.67 W / m hail), and often even higher. [one]
Fire bricks are used to conserve heat . Furnaces and fireplaces create coziness in the house - they accumulate and gradually give off heat, maintaining a pleasant temperature in the house, therefore fire bricks should be distinguished:
- large thermal inertia - the brick should heat up for a long time and slowly cool down
- large heat capacity - brick must accumulate a lot of heat
Heat capacity is the amount of heat in Joel, which must be transferred to a substance in order to raise its temperature by a degree, that is, the higher the heat capacity, the more slowly the substance heats up. Indeed, chamotte brick has a higher heat capacity than red brick, and it linearly increases with temperature, that is, at 100 degrees it is approximately equal to red brick, and at 500 degrees it is 25-30% higher, that is, chamotte brick heats up more slowly than Red brick! But at the same time it absorbs more heat, which, again, during the reverse cooling process, it will give back to the furnace. [2]
The most basic and practically used property of a chamotte brick is that it is refractory, that is, it does not crack and does not prick when heated to high temperatures.
This brick should not be used in high humidity over 80%.
Types
- Fireclay chamotte brick [3] - made of chamotte clay .
- Refractory Gzhel brick [3] [4] .
- Refractory borovichi brick [3] .
Notes
- ↑ 1. Physical quantities. Directory. A.P. Babichev, N.A. Babushkina, A.M. Bratkovsky and others; Ed. I.S. Grigorieva, E.Z. Meilikhov. - M.: Energoatomizdat, 1991. - 1232 p. 2. Eremkin A.I., Koroleva T.I. Thermal regime of buildings: Tutorial. - M .: Publishing house ACB, 2000 - 368 p. 3. Kirillov P.L., Bogoslovskaya G.P. Heat transfer in nuclear power plants: A textbook for universities. - M .: Energoatomizdat, 2000. - 456 pp., Ill. 4. Mikheev M.A., Mikheeva I.M. Basics of heat transfer. 5. Franchuk A.U. Tables of heat engineering indicators of building materials, M .: Scientific Research Institute of Building Physics, 1969 - 142 p. 6. V. Blazy. Designer's Handbook. Building physics. M .: Tekhnosfera, 2004. 7. Construction heat engineering Building Norms and Regulations II-3-79. Minstroy of Russia - Moscow 1995. 8. Novichenk NL, Shulman Z.P. Thermophysical properties of polymers. Minsk, "Science and Technology" 1971.- 120 p. 9. Isachenko V.P., Osipova V.A., Sukomel A.S. Heat transfer. Textbook for universities, ed. 3rd, pererabot. and add. - M .: "Energy", 1975. - 488 p. Thermal conductivity of building materials, their density and heat capacity .
- А. Franchuk A. U. Tables of heat engineering indicators of building materials, Moscow: Scientific Research Institute of Building Physics, 1969 - 142 p. Tables of physical quantities. Directory. Ed. Acad. IK Kikoina. M .: Atomizdat, 1976. - 1008 p. building physics, 1969 - 142 p. Kazantsev E.I. Industrial furnaces. Reference guide for calculations and design. Mikheev M. A., Mikheeva I. M. Fundamentals of heat transfer. Density and specific heat of a brick .
- ↑ 1 2 3 Kovalevsky I.I. Furnace work. - M .: Higher School, 1983. - p. 86. - 208 p.
- ↑ Gzhel clay // Great Encyclopedia of Oil and Gas
Literature
- Firebrick // Big Encyclopedia of Oil and Gas