Refractory bricks and castable for boiler lining are used in combination.The advantage of using refractory bricks is that refractory bricks are sintered at high temperature,have fatigue resistance .Only through good sintering can good effects be achieved.
The use of refractory castables also has the advantages of castables,some parts are irregular,and the construction conditions are harsh,it is easy to use refractory castables.The castable construction is convenient，the production cycle is short,and the overall air tightness is good.
When the refractory bricks require the same material as the castable,the relative price will be more expensive.This is caused by the cost of forming.and sintering multiple production processes,but the refractory brick has stable performance and is widely used.The total use ratio is still higher than castable ration.
Refractory castables require high process technology,especially in the proportion of furnace roof and furnace wall.
Refractory bricks include sintered bricks and non-fired bricks.The more common sintered bricks on boilers include clay bricks,high alumina bricks mullite bricks and thermal insulation bricks .Non fired bricks are also prefabricated parts combined with cement,which are also useful in furnaces.But in must also be baked at a low temperature of 300 degrees to ensure the strength of use.
The production process of refractory castables is simple, the raw materials are the same as refractory bricks, but they are made by mixing refractory aggregates, powders, binders, etc. After pouring in construction, curing and oven should be carried out.
The cycle of refractory castables is short, and the production cycle of refractory bricks is long. It needs to be fired in advance and the production cost is high. Castables are produced by direct mixing without firing. However, the amount of water added during construction must be strictly controlled.
In short, whether it is refractory brick or castable, control is the most important in process production. According to different parts of the boiler and different temperatures. Refractory brick high pressure forming, high temperature sintering,castable micro-powder technology and control of the amount added during construction can make the lining service life longer.