Ship central cooling water multi-section ratio control system and method

A technology of ratio control and cooling water, which is applied in the directions of hull ventilation/heating/cooling, ship propulsion, ship construction, etc. It can solve problems such as unspecified implementation methods, achieve the effect of reducing frequent actions and enhancing system stability

Pending Publication Date: 2018-11-06
GUANGZHOU MARITIME INST
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Problems solved by technology

Although domestic scholars have proposed to change the control mode of seawater frequency conversion pu...

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  • Ship central cooling water multi-section ratio control system and method
  • Ship central cooling water multi-section ratio control system and method
  • Ship central cooling water multi-section ratio control system and method

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Embodiment Construction

[0023] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0024] see Figure 1-5 , a ship's central cooling water multi-stage ratio control system, including the ship's main engine system, fresh water cooling pump, cooler, three-way valve controller, PLC controller and field operation box, which first cools the fresh water with seawater through the central cooler, and then Use the cooled fresh water as the cooling medium to cool the main engine system of the ship and other equipment that needs to be cooled. In order...

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Abstract

The invention discloses a ship central cooling water multi-section ratio control system and method. The system comprises a ship mainframe system, a freshwater cooling pump, a cooler, a three-way valvecontroller, a PLC and an on-site operation box; the ship mainframe system is connected with the PLC and the freshwater cooling pump separately, and the freshwater cooling pump is connected with the cooler and the three-way valve controller separately. The system has the advantages that 1, the frequency of a frequency converter is controlled according to the opening degree of a valve, and then, the rotating speed of a sea water frequency conversion pump is controlled, wherein a multi-stage ratio control function is adopted for the corresponding relation between the opening degree of the valveand the frequency of the frequency converter; 2, a switching function is added, a smith hysteresis comparator is adopted, and the system stability is enhanced; 3, when the outlet sea water temperatureof a plate heat exchanger reaches the safety limit of 49 DEG C, the frequency converter of the system can be automatically switched into the maximum limit frequency for operation; 4, frequent motionsof the three-way valve are reduced.

Description

technical field [0001] The invention relates to a control system, in particular to a multi-stage ratio control system and method for central cooling water of a ship. Background technique [0002] At present, the central cooling water control system of ships generally adopts power frequency pumps to run at full speed, and the bypass volume is adjusted by the three-way valve thermostat to stabilize the inlet temperature of the low-temperature fresh water circuit at 36°C. Although this control method is simple, requires less investment, and has good stability, the seawater pump operates at a power exceeding the actual requirement for a long time, resulting in high energy consumption, frequent actions of the actuator, and large wear of the three-way valve. [0003] The ENGARD ship central cooling water system developed by Sweden’s Alfa Laval Company can change poles and adjust the speed of seawater pumps according to the heat load change of the central cooling water system, and ...

Claims

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Application Information

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IPC IPC(8): B63H21/38B63J2/12
CPCB63H21/383B63J2/12
Inventor 王永祥
Owner GUANGZHOU MARITIME INST
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