Refractory protective blocks and protective wall structure of boiler using same

A protective wall structure for a boiler containing heat exchange means including a plurality of tubes having their axes parallelly disposed and intermediately disposed fins welded to, and interconnecting, said tubes, said protective wall structure comprising:

• a plurality of identically formed refractory protective blocks having an inside surface whose shape complements the external shape of said heat exchange means,
• projections formed on external surfaces of said tubes, said projections being elongated vertically only a limited length and disposed at alternately spaced locations along the length of adjacent tubes, and
• recesses formed on the inside surface of said refractory protective blocks, and disposed intermediate longitudinally spaced ends of said blocks said recesses being closed at opposite ends and each including a first portion formed of substantially rectangularly disposed sides and a second portion which complements and receives one of said projections, each said second portion being spaced axially from said first portion and connecting therewith.

A protective wall structure of a boiler containing heat exchange means including a plurality of tubes having their axes parallelly disposed and intermediately disposed fins welded to and interconnecting said tubes, said protective wall structure comprising:

• a plurality of refractory protective blocks having a hexagonal peripheral shape and an inside surface whose shape complements the external shape of said heat exchange means,
• projections formed on an external surface of said tubes, said projections extending in a direction laterally inclined with respect to said tubes axis, and
• recesses formed on the inside surface of said refractory protective blocks conforming to and receiving said projections.