Patent ID: 7766731
Filing Date: 2010-08-03
Classification: F23J

Abstract:
1. An exhaust gas chimney comprising: an inner shell in the form of a metal tube through which exhaust gas passes; a ring jacket surrounding the metal shell and forming a space between the ring jacket and the inner shell, the ring jacket comprising a cylindrical part spaced from the inner shell, a lower end plate inclined obliquely downward from the cylindrical part to the inner shell and joined directly to the inner shell, and an upper end plate inclined obliquely upward from the cylindrical part toward the inner shell; a plurality of ribs joined to the inner shell inside the ring jacket and extending radially outward and upward toward the ring jacket at an acute angle as measured from between the inner surface of each said rib to the outer surface of the inner shell, each said rib having a radially outer edge spaced from the jacket; and a bulk material in the space between the ring jacket and the inner shell; wherein the upper end plate is one of: