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Refractory Service Life Vs Ash Chemistry

thread367-75972

Refractory Service Life Vs Ash Chemistry

Refractory Service Life Vs Ash Chemistry

(OP)
I have a few wet bottom boilers (molten slag which runs over refractory lined floor tubes) which are expierencing reduced refractory life.  

These units changed fuels which brings a change in ash chemistry, more basic or more acidic.  So, I would like to know if there is some information out there which indicates a nned to change the refractory composition because the base to acid ratio changed?

The fuel change also changed the viscosity of the ash so it is more fluid.  I expected the change in viscosity to reduce the service life some, but not greater than 1/2.

RE: Refractory Service Life Vs Ash Chemistry

(OP)
Just as a follow up.

I found out that a change in ash chemistry will effect the service life of the refractory.  If the % basic constitutents increace, then the Si matrix will be attacked and cause the refractory to spall.

Just something for folks to thinik about if you change fuels.

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