Tight structure for external solar receiver in a tower of a concentrating solar power plant

An external solar receiver for a concentrating thermodynamic solar power plant of the type with a tower and heliostat field, the tower comprising:

• a wind tight modular inner structure, as a casing;
• and
• a plurality of heat exchanger tube receiver panels fastened to that inner structure,
• wherein each panel includes a plurality of metal boxes supporting the heat exchanger tubes and assembled to one another by assemblers configured to allow disassembly,
• wherein each metal box is covered with thermal insulation via an anchor,
• wherein the heat exchanger tubes are secured to the boxes by a removable and floating connector, allowing thermal expansion of the heat exchanger tubes and thermal expansion of a part of their support subject to a high temperature both in a longitudinal direction of the heat exchanger tubes and in transverse directions thereto,
• wherein each heat exchanger tube includes several welded eyelets distributed over a height of the heat exchanger tube, able, under axial thermal expansion of the heat exchanger tube, and configured to have a key slid therein,
• wherein the key is fastened to the metal box through the thermal insulation (4) by support bars, so that movement of the heat exchanger tubes under expansion, substantially in the longitudinal direction and along a plane of the panel, occurs outside the thermal insulation.