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The reason of explosion of refractory castable in cement kiln

Date:2019-08-20 15:21 Source:cementepcViews:

In order to improve rotary kiln operation rate and production efficiency and reduce production cost, most cement making enterprises have problems of heavy production task and short maintenance time.

For cement production enterprise, repair, overhaul time control at 8 ~ 15 days, but our country cement kiln using more predominantly hydraulic combined with low cement series refractory castables, its construction, maintenance, and baking must meet certain cycle, therefore in the construction period is short, fast drying kiln, prone to castable burst phenomenon, especially some special bidding castable, burst in the baking production line feeding, stay kiln to pouring, bring unnecessary loss.

cement kiln

The reason that produces blowout has 4 kinds commonly

 

1. Curing and baking time of compressed castable


Each cement production enterprise production task is heavy, a daily production line of 5000 tons of cement, the daily production amount is about 1 million yuan, so most of the cement factory maintenance needs to rush time, in order to open kiln production as soon as possible, have to compress the maintenance and baking time of castable.
 

2. Refractory castable material


At present, the refractory castable materials used in cement kilns in China are mainly SiO2 and Al2O3 systems, and the binder is aluminate cement, which is a type of fast hardening and high strength cement. This requires sufficient curing time and reasonable baking system after the completion of construction of castable, which requires a long time.
 

3. Construction level


The overhaul of China's cement industry is basically entrusted to the furnace company, the professional level of the construction team, whether the construction standard will have an impact on the construction quality and use effect of refractory castable.

cement kiln

4. Baking is difficult


Some special parts of the cement kiln, such as the front kiln products, kiln head cover, the top of the cooling machine and the side wall, etc., are difficult to bake.For these parts, some cement enterprises do not use wood baking, some enterprises only for a short time to bake.In burner stage of drying kiln, as a result of cement kiln process parameters, the control of heat flow all at a certain speed transmission and radiation to the preheater system, and the kiln head cover only part of the radiation of heat and cold machine, the heat is not enough to fully discharge and water of the castable in freedom, began to continual production system of the heat flow at the kiln head back within a short time, at the same time, the high temperature clinker began in kiln hood accumulation, cause the kiln head cover, cold machine parts, the temperature rise sharply, at this point, the most prone to castable burst, falls off phenomenon.

The above various factors caused by the cement manufacturers during the maintenance of pouring material burst problem is more prominent, cause every year there are cement factories due to pouring material explosion measures not done well, baking system is not reasonable, causing kiln head cover, cold machine pouring material burst, collapse.

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