| 摘要 |
Particulate material is conveyed in a dense phase in either a batch mode of conveyance or a continuous mode. In either mode, during the conveyance cycle, the flow rate of compressed gas to the transporter vessel is adjusted to control material conveyance. During start-up the flow rate is decreased to allow material to build in the vessel, then the rate is increased to a normal conveyance value. At the end of the cycle, the flow rate is again decreased to avoid surges and high velocity flow. During the normal conveyance cycle, the flow rate is decreased if the material level in the vessel falls below a minimum value and increased if it rises above a maximum value. The flow rate is adjusted by opening and closing the throat in a venturi tube in an adjustable valve in the gas flow line connected to the vessel.
|
