BOILER

摘要

Suspended superheaters (52 and 53) alone are provided in the outlet of a furnace. The heat transfer areas of these superheaters are determined so that the temperature of exhaust gas in the rear flow thereof may be 1000-1100 ~C under the maximum load of a boiler. The passages of the exhaust gas in the rear flow of the superheaters (52 and 53) are divided into subpassages along the flow of the exhaust gas and a damper for regulating the flow rate of the exhaust gas flowing through each subpassage is provided at an outlet of each of the subpassages. A horizontal reheater (41) is provided for the subpassages. Since the temperature difference between the temperature (10001100 ~C) of the exhaust gas flowing around the reheater (41) and the temperature of steam flowing through the reheater (41) is large, a highly effective heat exchange can be conducted for even a small heat transfer area. Accordingly, an increase in the heat transfer area of the reheater (41), that is, in the size of the whole, can be suppressed.