| 摘要 |
PURPOSE:To enable a cooling operation to be carried out through a continuous circula tion of the first circulation flow by a method wherein not only the first circulation flow but also the second circulation flow is generated and the first circulation flow is mixed with the second circulation flow before the first circulation flow comes into contact with a thermal absorbing material. CONSTITUTION:The first circulation flow A takes out heat directly from a furnace chamber 26 while the first circulation flow A flows from a lowerside to an upper side. It radiates heat to an inner surface of a high pressure cylinder 20 acting as a thermal absorbing member having a anti-pressure capability while reversing its flow direction and flowing downwardly. In turn, the second circulation flow B is a circulation flow which flows from a lower side to an upper side and then flows down along the inner surface of the high pressure cylinder 20. The first circulation flow is mixed with the second circulation flow B near a gas flow passage 31A until the first circulation flow reaches the thermal absorbing material. In this case, a fluid temperature on a surface of the thermal absorbing material having an anti-pressure capability is lower than that of the conventional one, it does not exceed a designed allowable limitation, resulting in that a cooling through a continuous circulation of the first circulation flow A can be carried out. |
