| 摘要 |
Protecting the inlet ends of heat exchanger tubes from erosion. A gas contg. abrasive particles flows through heat exchanger tubes. To protect the inlet ends of the tubes from erosion by the abrasive particles, each inlet end (a) of each tube (a1) projects beyond the tube plate, and enters the counter board end of an extension tube (b). Tube (b) has a surface hardness which is higher than that of the exchanger tubes (a1). Tubes (a1) are pref. made of ordinary carbon steel, whereas tubes (b) are made of hardened steel with a surface hardness of 350 Brinell. The gas is obtd. e.g. from burning coal, and contains silica particles which normally erode the inlet ends of tubes (a1). |
