A dual-mode switching method for the pump flow mode and the self-flow mode of the ship's cooling system

Abstract

The invention discloses a dual-mode switching method of a pump flow mode and an artesian mode of a cooling system of a ship, comprising the following steps: 1) determining the required vacuum of the condenser of the cooling system, represented by pressure; 2) setting the vacuum value p ref As a mark of the pump flow mode and the self-flow mode; 3) Design the start and exit rules of the pump flow mode; when the vacuum value in the detected condenser is greater than the set value and remains above N sampling periods, the cooling system maintains the pump flow mode , or switch from the self-flow mode to the pump flow mode; when the detected vacuum value in the condenser is less than the set value and remains above N sampling periods, the cooling system will maintain the self-flow mode, or switch from the pump flow mode to the self-flow mode. The present invention provides two switching modes, satisfying the maximization of the artesian speed range or the best vacuum environment, which can respectively meet the performance requirements of energy saving, noise reduction effect and operating vacuum environment, and contribute to the multi-objective operation of the cooling system accomplish.

Description

technical field [0001] The invention belongs to the technical field of ship power plant control, and more specifically relates to a dual-mode switching method of a pump flow mode and an artesian mode of a ship cooling system. Background technique [0002] The condensing steam turbine is the power system of the ship, and its cooling water system is one of the most important subsystems, which is used to condense the exhaust steam generated by the steam turbine and maintain the vacuum condition required for the steam turbine to work. The self-flow mode cooling system is a new type of cooling water system. Different from the traditional pump mode cooling water system, its work does not depend on the operation of the water pump, which is more energy-saving and can greatly reduce the noise of the cooling water system. An important development direction of the system. Such as figure 1 As shown, the self-flow mode cooling system is usually composed of inlet nozzles and shrouds, ou...

AI Technical Summary

Problems solved by technology

However, since the cooling seawater temperature t in different sea areas varies, the artesian speed zone v 1 -v 2 It is and will be changed. The timing of switching from the self-flowing mode cooling system to the pumping mode cooling system needs to be dynamically grasped, and it is necessary to ensure that the vacuum always meets the requirements during the conversion process, and reciprocating switching near the conversion point cannot occur. Otherwise, the system will will not run stably

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