Waste heat boiler

A waste heat boiler comprising:

• a boiler having an exhaust gas inlet and an exhaust gas outlet;
• and
• a plurality of heating tubes disposed in the boiler, a surface of each heating tube of the plurality of heating tubes having a plurality of fins, the plurality of heating tubes being disposed within a plurality of support assemblies such that the plurality of heating tubes are supported by the plurality of support assemblies without being affixed to the plurality of support assemblies and are configured to move freely relative to the plurality of support assemblies, the plurality of support assemblies including:
• a plurality of support rings corresponding to respective heating tubes of the plurality of heating tubes, each heating tube of the plurality of heating tubes being disposed within a hole of a corresponding support ring of the plurality of support rings, and
• a plurality of support beams only disposed below all of the support rings with respect to a vertical direction of the boiler, the plurality of support beams being configured to maintain the plurality of support rings in a fixed position,
• wherein a gap between an outer peripheral surface of each heating tube and an inner peripheral surface of the corresponding to a respective support ring is configured to allow the heating tube and the support ring to move relative to each other;
• and
• a hammering device.