| 摘要 |
The flexible covering is intended for gas storage devices with variable volume and rigid and preferably circular walls (40). The covering is comprised of a gas-tight sheet (42, 45) which may be held in any position by means of a straightening ring (46) while keeping its shape, and in sealing contact (43) with the wall at approximately half the height of the gas volume (G). The cover part (42) of the sheet is tensioned inside the ring (46) as a spherical calotte while its peripheral part (45) extends along the wall upon filling the gas storage device. The load required to obtain the gas pressure may be provided by the ring (46) itself or by weights which may be suspended thereto directly or by means of sheaves (62). Such gas storage devices are appropriate to be incorporated in an aerobic fermentation plant wherein the level (N) of fermentation substrate (B) provides for the lower sealing of the gas volume. The load (60) may be provided by a device for mixing a fermentation substrate or for breaking a supernatant. In order to avoid thermal loss in the fermentation vat, the sheet is provided with a thermal insulation (W). |
