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The new dry-process cement kiln new production line is baked like this!
Dec 06, 2018

Refractory materials for cement kiln:


 The baking system of the new dry process cement kiln new production line?


The new clinker production line has a large amount of refractory construction. Most of the locations are composite linings composed of calcium silicate board and refractory castable. The construction period is generally about 3 months, and rainy weather occurs during construction. In order to enable the free water and compound water of the refractory lining to be fully baked to meet the production needs, the rotary kiln is burned by the kiln under the premise that the preheater, the tertiary air duct and the grate cooler system use wood for initial baking. The baking time for baking must be up to 4 days.


When the preheater, the tertiary air duct and the grate cooler system are completed, after the experience is passed, the wood can be used for local initial baking, and the natural water and part of the combined water of the refractory material of the part are mainly baked. According to the actual situation on the site, the parts baked with wood can be simultaneously carried out, the heat source temperature is about 700 ° C, and the baking time is about 3 days. The tertiary air duct and the grate cooler wood baking and the kiln burner baking can be carried out simultaneously.


(1) Initial baking of the preheater section


The baking source is set at the end of the kiln. Put a firewood chop (wooden board or the like) on the shelf set up in the kiln exhaust chamber, and then ignite and start baking. During the baking process, wood is added from the square door of the kiln exhaust chamber, and the preheater and the decomposition furnace are mainly baked. The amount of wood is controlled according to the outlet temperature of the preheater, and the outlet temperature of the preheater is controlled below 80 °C.


(2) Initial baking of the third duct portion


The baking source is set on the head side of the tertiary duct kiln. The third air baffle is fully opened, and the firewood is stacked in the third air duct on the kiln head side, and then ignited to start baking. During the baking process, wood is added from the manhole door, and the baking temperature is controlled by the amount of wood added. The outlet temperature of the decomposition furnace is controlled below 80 ° C, and the third air duct and the decomposition furnace refractory material are mainly baked.


(3) Initial baking of the grate cooler


The chiller sets the baking source. Stack the firewood on the surface of the trampoline (not to use nailed wood such as wooden pallets), then ignite and start baking. During the baking process, the front wall portion of the grate cooler is gradually baked backwards, wood is added on the cooler machine bed, and the baking temperature is controlled by the amount of wood added, and the refractory material of the chiller and the kiln head cover is mainly baked.


(4) Rotary kiln ignition temperature rise curve


Baking with a kiln burner is the main baking stage and is designed to fully bake the moisture of the refractory material in the rotary kiln, preheater and decomposition furnace. The baking time is 96h, divided into three sections: low temperature section, 25~300°C, baking time is 24h; medium temperature section, 300~650°C, baking time is 50h; high temperature section, 650~1100°C The baking time is 22h.


(5) Rotary kiln system


During the baking, the auxiliary kiln is used to rotate the kiln according to Table 3-15, and the temperature in the rotary kiln is evenly heated to ensure the center line and ovality of the kiln are normal.


(6) After the production, the natural water and other forms of moisture left by the ventilating part of the air duct and the cooling machine of the kiln clinker are baked.


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