Abstract: A heat-insulating lining on heat exchanger surfaces for reducing the heat flow at the cooling surfaces of a medium- or high-pressure heat exchanger, which comprises a tube-web-tube wall. Corrosion resistant fastening pins are arranged in a weld area on the webs of the cooling surface. A ceramic fiber material is arranged as a heatinsulating material on both sides of the webs up to the level of the outside of the tubes of the tube wall, and segments of a ceramic moleskin mat, which are held by fastening pins and fastening washers, are arranged above it on both sides. An expanded metal, which is protected by a refractory material with good corrosion resistance, is additionally arranged at one or both edge zones and at the locations of the joints of the moleskin mat segments.

Abstract: A heat insulation and corrosion protection of the inner vessel wall of a heat exchanger in a synthesis gas cooler. The heat insulation and corrosion protection are arranged above a thermal seal fastened between the vessel wall and the cooling tubes. The insulation and protection includes segments of fiber-filled plates, which are fastened to the vessel wall by means of a substructure and an adhesive or foam material. Support rings with a heat insulation protection means absorb the vertical forces. A metallic corrosion protection layer is applied to the inner vessel wall under the thermal seal. Free breathing of the vessel wall is possible and pressure equalization between the gas space and the annular space is guaranteed due to the heat insulation and corrosion protection according to the present invention.