| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a radiant tube having a small distance between a first straight tube with one end incorporating a combustion burner and a fourth straight tube with one end connected with an outside-furnace exhaust gas connection tube, while preventing local heating of a U-shaped tube. <P>SOLUTION: The first straight tube with one end connected with the combustion burner and the other end connected to a first vent is arranged in parallel with the fourth straight tube with one end communicated with outside of a furnace and the other end connected to a third vent. A second straight tube and a third straight tube are arranged in parallel with the first straight tube and the fourth straight tube while being connected by a second vent. The second straight tube is connected to the first vent, and the third straight tube is connected to the second vent so as to compose the radiant tube. At this time, the first straight tube, the second straight tube, the third straight tube, and the fourth straight tube are arranged to satisfy the following formula. <P>COPYRIGHT: (C)2012,JPO&INPIT |
