Refractory material Remarkable Characteristics for Hazardous Waste Rotary Kiln
Hazardous waste incineration in a rotary kiln generally undergoes several stages, such as drying, pyrolysis, combustion, and burnout, so that hazardous components in hazardous waste are fully decomposed and destroyed under the action of high temperature, forming high-temperature flue gas and slag.
These high-temperature flue gas and slag will cause erosive damage to the refractory materials built in the rotary kiln.
Refractory material Remarkable Characteristics for Hazardous Waste Rotary Kiln
Therefore, SIJIHUO REFRACTORY makes a conclusion for refractory materials’ characteristics for rotary kilns for hazardous waste incineration:
Being able to operate in a high-temperature environment above 800 ℃ for a long time.
The refractory material for the rotary kiln lining needs to have a certain mechanical strength to withstand the expansion stress at high temperatures and the stress caused by the deformation of the rotary kiln shell.
At the same time, because the hazardous waste and the dust in the flue gas will cause wear on the kiln lining, it is required to have strong abrasion resistance.
Alkali (potassium, sodium), halogen (chlorine, fluorine) and sulfur compounds, etc. have the greatest influence on the quality of refractories.
In the case of furnace shutdown, furnace start, and operating under unstable rotation, the temperature change in the kiln is relatively large, which requires that the refractory material must not crack or flake under the condition of drastic temperature change.
Although the thermal expansion coefficient of the rotary kiln shell (generally carbon steel plate) is greater than the thermal expansion coefficient of the rotary kiln refractory, the shell temperature is generally around 150 to 300 ℃, and the temperature of the refractory material is generally above 800 ℃
It may cause the refractory material to thermally expand more than the rotary kiln shell and easily peel off.
If the porosity is high, the smoke will penetrate into the refractory and corrode the refractory linings.
At present, in domestic and foreign hazardous waste incinerators, rotary kilns are usually built with refractory bricks, and refractory castables are only used at both ends of the kiln.
The commonly used refractory bricks mainly include mullite bricks, high alumina bricks, etc. The castables are mainly high alumina refractory castables, corundum mullite castables, and the castables shall be blended and vibrated with stainless steel fibers to reinforce the abrasion resistance and mechanical strength.
After the kiln-lined refractory bricks are built in the rotary kiln for hazardous waste treatment, an oven process is required. The purpose is to remove the water in the refractory masonry, so that it can exert the high-temperature performance of the material and the strength of the masonry.
Please contact us for the specific scheme of its oven.
If you need a refractory material recommendation for Hazardous Waste Rotary Kiln, please send us your RFQ by email or leave us a message, we will revert back in 24hours.
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