Patent ID: 8240364

Claim:
A power plant heat exchanger, comprising: a plurality of heat exchanger tubes that route a cooling medium, having an outside surface and an inside surface, the inside surface comprising an uppermost portion that encompasses an uppermost position of the tube when the tube is oriented for operation, and a non-uppermost portion location remote from the uppermost portion, wherein: a first layer is arranged on the outside surface of the tube for reducing an adhesion of the steam medium, and a second toxically acting layer, which includes a second material that is different than the first material of the first layer, limited to covering the non-uppermost portion of the inside surface of the tube, wherein the toxically acting layer reduces formation and growth of organic substances on the non-uppermost portion of the inside surface of the tube through a toxic effect on organic substances; and a steam medium routing configured to rout a steam medium upon the outside surface of the heat exchanger tube.