| 摘要 |
A pair of parallel flow rotary regenerative air heaters (16, 18) which extract heat from the combustion gases exhausted from a furnace (10). The gases, after giving up heat in the air heaters, flow to an electrostatic precipitator (30). In order to eliminate any temperature unbalance across the width of the main duct (28) leading to the precipitator, the duct (24) from the first air heater is connected to the main duct in such a manner that the hottest portion of the gases (H-1) are introduced along one side, and the relatively cooler portion (C-1) of the gases are introduced along the other side. The duct (26) from the second air heater is connected to the main duct in such a manner that the relatively cooler portion of the gases (C-2) are introduced along said one side, and the hottest portion of the gases (H-2) are introduced along said other side, thereby eliminating temperature unbalances across the width of the main duct.
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