Patent EP-2051031-B1 (EP)
Inventor: MASCHKE ULRICH DIPL-ING
IPC: F28F27/02
Filed: 2008-10-13
Granted: 2011-05-25
Abstract: The cooling water system (1) for power plants and industrial assemblies, comprises three water-cooling strands (2.1, 2.2, 2.3), each of which comprises a cooling water inlet (4.1, 4.2, 4.3) guided the water from a cooling water reservoir to a cooling water flow line (6.1, 6.2, 6.3), a mechanical cleaning device in the cooling water flow line downstream to the cooling water inlet, cooling water pumps in the cooling water flow line downstream to the cleaning device and a heat exchanger mechanism downstream to the cooling water pump at the end of the cooling water flow line. The cooling water system (1) for power plants and industrial assemblies, comprises three water-cooling strands (2.1, 2.2, 2.3), each of which comprises a cooling water inlet (4.1, 4.2, 4.3) guided the water from a cooling water reservoir to a cooling water flow line (6.1, 6.2, 6.3), a mechanical cleaning device in the cooling water flow line downstream to the cooling water inlet, cooling water pumps in the cooling water flow line downstream to the cleaning device, a heat exchanger mechanism downstream to the cooling water pump at the end of the cooling water flow line and cooling water return lines (13.1, 13.2, 13.3) downstream to the heat exchanger mechanism and guided to a cooling water outlet in the cooling water reservoir, selective activatable return shut-off devices arranged in the return lines, and a return connector arranged above the shut-off device and the cleaning device and between the return lines. The cooling water system has an operational state for thermoshock-treatment of the cooling water system, in which one of the cooling water pumps is conveyable by moving another cooling water pump in a closed short-circuit cycle in the cooling water system under heating at a thermo-shock treatment temperature in the heat exchanger mechanism backwardly by one of the cooling water flow lines, in the closed return shut-off device over a flow connector during shutdown. The flow-connector is shut-off over flow shut-off devices. In the operational state, the return shut-off devices are closed and one of the flow shut-off devices is opened. The heat exchanger mechanisms in the strands are formed by a common heat exchanger or turbine condenser with a separate water chamber. In the operational state, closed cooling water pump is protected by a non-return device or a bypass-line. The cooling water flow line branching-off from the return shut-off devices is intended at the return line. The flow line guides over a flow cooling device to the cooling water outlet. A selective activatable additional shut-off device is arranged in the flow line. Two of the strands are connected with the third strands over the return connector and the flow connector, in which the return- and the flow shut-off device are arranged and controllable, so that the closed short-circuit cycle is producible by two pairs of interconnected strands. The return shut-off device is arranged in each return line and a connecting collection-return line. A regulating valve in the collection-return line actuates the function of the return shut-off device and controllably closes the return for the thermo-shock treatment.