refractory selection

[macmet]

So, this question isn't really about boilers or pressure vessel engineering but I thought this was still the best place to put it.

We do solid fuel fired combustion chambers, generally for boiler applications. Our chambers have a lining that is plastic refractory backed by insulation. This plastic linig has worked well for us in the past and we are generally satisfied with it. The only problem we seem to have is a system now and then will have erosion problems.

But, recently an installer has asked us if they can use castable instead of the plastic material. When I look at the material specs they seem to be similar. My question is, when should you use plastic refractory and when should you use castable. Is it simply up to whichever is easiest to install or does one form of refractory have any performance benefits.

The job in particular has a dry fuel (less than 10% MC) and is fairly low ash (less than 5%).

 

[diskullman]

There are many different formulas for castables and plastics, depending upon the application. Castables may have more options for installation. You might want to contact Harbison Walker (old name) for an unbiased opinion, as they manufacture a wide range of both types of product. They have a full staff of engineers to help with your particular application. Their new name is ANH Refractories.

http://www.anhrefractories.com/

Russell Giuliano