IMPROVED CONTROL OF THE WATER ECONOMY OF A COOLING PATH

摘要

In a cooling path, hot rolled material (3) composed of metal is cooled. The cooling path has a pump (7) which extracts coolant (2) from a coolant reservoir (8) and feeds said coolant via a line system (9) to a number of coolant outlets (4, 6) which are controlled by means of valves (10) positioned upstream of the coolant outlets (4, 6). A control device (11) of the cooling path determines activation states (Ci) for the valves (10) for a respective point in time taking into consideration coolant flows (Wi) which are intended to be discharged via the coolant outlets (4, 6) at the respective point in time, in conjunction with a working pressure (pA) of the coolant (2) prevailing at the inlet side of the valve (10). By adding the coolant flows (Wi), said control device determines a total coolant flow (WG). Taking into consideration the total coolant flow (WG), the working pressure (pA) of the coolant (2) and additionally a change (5WG) of the total coolant flow (WG), said control device determines a pump pressure (pP) that is intended to prevail at the outlet side of the pump (7) such that the working pressure (pA) is attained at the inlet side of the valves (10). Taking into consideration the total coolant flow (WG), the pump pressure (pP) and a suction pressure (pS) prevailing at the inlet side of the pump (7), said control device determines an activation state (CP) for the pump (7). Said control device activates the valves (10) and the pump (7) in accordance with the determined activation states (Ci, CP). The control device (11) performs said steps cyclically.