| 摘要 |
<p>PROBLEM TO BE SOLVED: To prevent a thermal expansion degree from generating a difference due to a difference in thermal dose in respect to a boiler wall and further prevent durability of the boiler wall from being decreased due to metal fatigue caused by strain.SOLUTION: This invention relates to a tube bundle structure boiler comprising two facing boiler walls 1 and a group of heat transfer pipes 2 arranged in a heating gas flow space 7 acting as a space held by the boiler walls 1 so as to heat the heat transfer pipes 2 by flowing heating gas in the heating gas flow space 7 in which a heat insulation material 3 is arranged at the heating gas flow space 7 of the boiler wall, the heat insulation material 3 increases heat insulation amount by the heat insulation material by setting a relative thick application at a location where relative high temperature heating gas flows and the heat insulation material 3 decreases heat insulation amount by the heat insulation material by setting a relative thin application at a location where relative low temperature heating gas flows.</p> |
