Heat exchanger tube block, exhaust heat recovery boiler, and method of constructing exhaust heat recovery boiler

A heat exchanger tube block comprising:

• a duct casing in which exhaust gas containing dust flows in an upper-lower direction;
• a heat exchanger tube located in the duct casing and extending in a horizontal direction;
• an inlet header connected to an inlet of the heat exchanger tube;
• an outlet header connected to an outlet of the heat exchanger tube;
• and
• a vibration transmitting body configured to transmit vibration, applied to an upper end part of the vibration transmitting body, to the heat exchanger tube to make the dust accumulating on the heat exchanger tube fall, wherein:
• upper and lower surfaces of the duct casing are open;
• the duct casing is formed in a tubular shape;
• a lower end of the duct casing extends horizontally;
• an upper end of the duct casing extends horizontally;
• the inlet header is located higher than the lower end of the duct casing;
• the outlet header is located higher than the lower end of the duct casing;
• the duct casing includes a lower recess formed such that an outer surface of the duct casing is concave inward;
• the lower recess is located under the vibration transmitting body and is formed so as to open downward and outward in the horizontal direction;
• the duct casing includes an upper recess formed such that an outer surface of the duct casing is concave inward;
• the upper recess is formed so as to open upward and outward in the horizontal direction, with an upper end of the upper recess being located at the upper end of the duct casing;
• the upper end part of the vibration transmitting body extends above the upper recess;
• and
• the inlet header is located at a hollow portion of the duct casing below the heat exchanger tube between the upper and lower recesses and the outlet header.