Frequency conversion control system and method for marine main seawater cooling pump

Abstract

The invention provides a frequency conversion control system and method for a marine main seawater cooling pump. The system comprises a frequency converter control cabinet, three seawater pump motors, three seawater pump starters, a signal acquisition control box, a fresh water outlet temperature sensor and a seawater outlet temperature sensor. The sea water pump motors are respectively connected with the frequency converter control cabinet through the sea water pump starters; the fresh water outlet temperature sensor is mounted at a fresh water outlet of a central cooler, and the seawater outlet temperature sensor is mounted at a seawater outlet of the central cooler; and the fresh water outlet temperature sensor and the seawater outlet temperature sensor are connected with the frequency converter control cabinet through the signal acquisition control box. According to the frequency conversion control system and method for the main seawater cooling pump for the ship, frequency conversion control over three seawater pumps of a central cooling system of the ship is achieved through one frequency converter control cabinet and low initial investment, and energy consumption is reduced.

Description

technical field [0001] The invention relates to the field of ship cooling systems, in particular to a frequency conversion control system and method for a ship's main seawater cooling pump. Background technique [0002] Most modern ships use a central low-temperature fresh water cooling system. The seawater cooling pump pumps seawater into the central cooler, and through the central cooler, the fresh water is cooled to a preset temperature (usually 36°C), and then the low-temperature fresh water is used to cool the main cooling system. Auxiliary equipment and other equipment. The inlet of the central cooler is generally supplied with seawater by 3 main seawater pumps, of which 2 are working and 1 is standby. [0003] In the past, seawater pumps were mostly driven by fixed-frequency motors. Regardless of winter or summer, regardless of whether the main and auxiliary engine loads were high or low, the seawater pump motors always worked at rated speeds, and the power consumpti...

AI Technical Summary

Problems solved by technology

Now there are two schemes for the control of seawater cooling pumps: Scheme 1. Seawater cooling pumps use traditional fixed-frequency motors. No matter when and where, the fixed-frequency motor-driven seawater pumps cannot be controlled according to the ambient temperature and cooling equipment. Load, timely frequency reduction, high energy consumption; plan 2, 3 seawater pumps with 3 inverters, according to seawater temperature and heat exchange requirements of cooling equipment, timely adjust the motor speed and pump displacement, energy consumption is reduced, but the inverter Expensive, high initial investment

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