| 摘要 |
The invention concerns a system and a method for the regulation of a continuous vapour phase digester (50). The relevant process inflows (CH, ST, WL, DL) are regulated with a process regulator (PC) depending on current process outflows (LIQRET, CHOUT) in order to establish a gas phase (STP) above a level (LIQLEV) of cooking fluid in the digester and a level of chips (CHLEV) in the digester that lies above the level of fluid. The process regulator has a first set of sensors (40, 41, 43) in order to control a first set of regulators (10, 11, 12, 13) in the input with respect to a first set of target values, and that [sic, syntax] the system comprises a load controller that is independent of the process regulator, which load controller has a second set of sensors (42) in order to control a second set of regulators (20, 21, 22, 23) in the input with respect to a second set of threshold values. The load controller closes at least one of the relevant inflows when these threshold values are exceeded. Alternatively, the load controller can open an otherwise closed line in order to reduce the volume of fluid in the digester. |
