Heat exchanger for heating gas and use of the heat exchanger
AssigneeBASF SE
InventorsOskar Stephan, Karl-Friedrich Schneider, Matthias Weismantel
Life of this patent
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Abstract
The invention relates to a heat exchanger for heating gas to a temperature in the range from 150 to 400° C., wherein the gas is heated by indirect heat transfer and all the surfaces of the walls of the heat exchanger which come into contact with the gas have been hot dip galvanized and the surfaces which come into contact with the gas, after the hot dip galvanization, have been heat treated at a temperature in the range from 400 to 750° C. The invention further relates to the use of the heat exchanger.
Claims6
A method of drying superabsorbent particles comprising the use of the heat exchanger according to a heat exchanger for heating gas to a temperature in the range from 150 to 400° C. by indirect heat transfer, wherein all surfaces of walls of the heat exchanger which contact a gas have been hot dip galvanized and then cooled under air to form a zinc-iron diffusion layer and a pure zinc layer on the walls, wherein after the hot dip galvanization and cooling under air, surfaces which contact the gas have been heat treated at a temperature in the range from 400 to 750° C., thereby achieving a zinc coating that remains stable and wherein no Kirkendall effect occurs.
Dependencies are inferred from the claim text.