Cement Kiln Refractory

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Fixed Equipment

preheater decomposition furnace system.

System liner material at 600 ℃ or more parts to withstand the erosion of alkali, sulfur, chloride, parts of the erosion stronger 800-1200 ℃, calciner and rising flue lining equipment within the local area from 1200 to 1500% withstand thermal stress and oxidation reducing the load, the system straight wall portion and top lining to withstand mechanical stress deformation of the metal casing, and with the system temperature increases.

Tertiary air duct system

Airflow within the system temperature below 900 ~ 950 ℃, but the temperature up to 1300 ℃ clinker fine particles into the air stream with the system, part of the deposited within the system, the system near the kiln entrance to withstand high temperature liner portion clinker fine particles abrasion and thermal stresses and base erosion, near the site of the decomposing furnace linings withstand temperatures lower than 1000 ℃, clinker abrasion and erosion base corresponding lower.

Kiln door

Kiln door in the vicinity of the flame, which is part of the clinker temperature exceeds 1350 ℃, the secondary air into the kiln temperature exceeds 1000 ℃, the back wall and two side clinker kiln door is easy to accumulate (commonly known as a snowman), kiln door linings withstand severe the high-temperature thermal stress, alkali, sulfur, chloride chemical attack and mechanical deformation stress metal cabinet.

Burner

Burner front liners to withstand the most severe high-temperature thermal stress, high temperature clinker fine particles accumulate and knot “snowman” chemical attack and internal airflow clinker dust abrasion and mechanical stress burners and high temperature deformation of the anchor.

Grate cooler

Inlet portion bear clinker knot “snowman” chemical corrosion and high-temperature thermal stress within the body to withstand the heat of clinker and clinker contact area, abrasive stress, top and vertical wall parts withstand the mechanical stress deformation of the metal cabinet , the stress with the grate cooler internal temperatures reduce weakened.

Rotary Kiln

Precalciner each division with no uniform standard, the name is also inconsistent, at home and abroad is used more precalciner into decomposition zone, the transition zone, firing zone (divided into the firing zone and center burning zone) under the transition zone (including clinker cooling zone and kilns). There is no clear definition between the band, vary with the raw fuel into the kiln and kiln firing case, each lined with a material amount of stress is as follows.

Decomposition with

Band decomposition temperature of the material is less than 900 ℃, in normal production, decomposition no kiln leather band with a strong base lining material by chlorine sulfur corrosion, thermal shock, oxidation-reduction load, cylinder ovality produce mechanical load .

Transition zone and firing zone

Within the transition zone material gradually increased to about 1300 ℃, then entered the burning zone generated clinker, clinker is cooled below the transition zone from the kilns discharge to grate cooler.

Various types of stress suffered by a rotary kiln

Rotary-Kiln-Firing-Zone

Up transitional zone status

  • Unstable kiln skin
  • Strong alkali chlorine sulfur attack
  • Thermal shock
  • Redox load
  • Wheel bands parts to produce mechanical load

The firing zone status

  • Stable kiln skin, preventing clinker
  • Liquid relative lining brick Penetration

Down transitional zone status

  • Unstable kiln skin
  • High thermal shock
  • Clinker corrosion and strong
  • The alkaline etching
  • Redox load
  • Wheel bands parts to produce mechanical load

Large kiln flame temperature up to 1700 ℃ rate above, without kiln skin protection, basic brick brickwork due to thermal stress occurs much burst peeling. Kiln skin thermal conductivity of about 1.2W / (m · ℃). As can often maintain about 150 mm thick leather kiln, rotary kiln, the lower transition zone and firing zone is precalciner thermal, mechanical stress and chemical attack the most serious of the site, but also basic refractory masonry site . From the results of the survey, the basic lining damage is the most serious part of the transition zone of the kiln mouth parts under the 42% stress of the total, followed by the transition zone round the backing of 22 percent taken off the site cylinder ovality deformation mechanical stresses occurring in up to 14%, while there is kiln burning zone lining skin protection, center firing zone of stress only 19% to about 15% of the firing zone. Stress percentage reflects the damage lining lining must withstand stress situation by lining material to choose, to get a longer life in production.

kiln lining stress change

The stress of rotary kiln lining material is mainly thermal, chemical, mechanical stress comprehensive results, the progress of the cement production technology is also reflected in the stress damaged brick lining changes. The figure is the European preheater, kiln liner brick suffer various stress conditions. From the figure, a preheater kiln fuel mainly for fuel, kiln larger diameter, dry homogenization chain technologies yet to be perfected, and thus mechanical stress, thermal, thermal shock and damage to the lining clinker brick infiltration is a major factor . 70 years after the kiln appear, kiln shell diameter greater decline, thermal strength decreases more, all technologies has been progress, and therefore mechanical stress, thermal, thermal shock has declined, chemical attack of the corresponding salts and cooked material penetration increased. 80 years to gradually replace coal-fired fuel and the further development of both technology and chemical erosion caused by burning coal ash salt increased clinker ash resulting damage was relatively lining brick lining brick has become a major factor in damage to the 90s groove gear with technology, homogenized chain techniques to further improve the industrial waste as an additional alternative fuel applications, salt corrosion and overheating damage has become the main reason for damage to the brick lining.