| 摘要 |
A control system and method for a dryer used to dry a line of gypsum boards. The control system automates control of the dryer by measuring the amount of wat er used at the mixer to produce board segments and determining a desired amount of water to be evaporated for each board segment based on the measured value. T he desired amount of water to be evaporated for each board segment is track ed through the production line and the total evaporation load of each dryer zon e is continuously calculated based on the board segments located in the dryer zon e at a given time. The dryer zone differential temperature is adjusted according to the calculated evaporation load. When a board is rejected from the board line, t he desired amounts of water to be evaporated of its corresponding board segment s are set to zero, thus signifying a gap. The control system can be implemente d using a distributed control concept, with PLC's controlling major process areas, and networked PC based supervisory operator interfaces located at key locations throughout the production line.
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