| 摘要 |
PCT No. PCT/FI93/00208 Sec. 371 Date Nov. 4, 1994 Sec. 102(e) Date Nov. 4, 1994 PCT Filed May 18, 1993 PCT Pub. No. WO93/23703 PCT Pub. Date Nov. 25, 1993Method and apparatus for providing a gas seal in a CFB reactor, which is provided with a vertical, slot-shaped return duct (16), and for regulating the flow of circulating mass therein. The gas seal (22) is formed by arranging barrier means (22, 24, 26) on two different levels in the regulation zone of the return duct to slow down the flow of the circulating mass through the regulation zone. The flow of the circulating mass through the regulation zone is regulated by injecting fluidizing gas (56, 58, 60) into the regulation zone.
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