KR101529229B1 - Stability cooling system for a vessel - Google Patents

Abstract

The present invention relates to a stable cooling system of a ship, comprising: a fresh water cooling pump for pumping incoming fresh water; A main seawater cooling pump for pumping seawater flowing through the seawater inlet; A cooler for cooling the fresh water introduced from the fresh water cooling pump through sea water flowing from the main sea water cooling pump; A first temperature sensing sensor installed on a connection pipe for supplying cooling water cooled in the cooler to the operation equipment; A control panel for receiving the cooling water temperature value sensed by the first temperature sensing sensor and controlling the main seawater cooling pump according to the received temperature value; A connection pipe that is cooled in the cooler and supplies the cooling water that has passed through the first temperature sensor to the operation equipment, and a bypass pipe that bypasses the fresh water pumped by the fresh water cooling pump to the operation device without passing through the cooler A flow control valve; A second temperature sensor installed on the connection pipe for sensing the temperature of the cooling water passing through the flow control valve; And a valve controller for receiving the temperature value of the coolant sensed by the second temperature sensor and controlling the flow rate control valve according to the received temperature value.

Ship, cooling, stable, fresh water, seawater

Description

[0001] STABILITY COOLING SYSTEM FOR A VESSEL [0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cooling system of a ship, and more particularly, to a stable cooling system of a ship capable of ensuring stability.

Generally, since the main engine installed in the ship, the generator engine, and the like generate heat during operation, various cooling devices such as a fresh water cooler are used to cool the heat generated from the operation equipment have. In the case of a fresh water cooler for cooling the operation equipment of such a ship, the heat of the operation equipment is cooled by the closed loop circulating fresh water, so that the fresh water whose temperature rises is cooled by the sea water and supplied again to the operation equipment do.

In the case of the central cooling system, the design of the central cooling fresh water cooler is based on the application of the sea water temperature of 32 ° C in summer, The temperature setting value is determined as 36 ° C. In addition, a bypass tube and a temperature control valve are installed at the cooler outlet so that the inlet temperature of the equipment requiring cooling is always kept constant regardless of the operating condition of the ship.

The design criterion of the centralized fresh water cooler is selected as the capacity to cool the operating equipment under the maximum load operating condition that can be applied when the maximum sea water temperature is 32 ° C in summer and when the ship is operated. Therefore, in a ship operation route where the main engine load is low or sea water temperature is low, some high temperature cooling water is mixed with low temperature cooling water passed through the cooler through the bypass pipe through the bypass pipe according to the operation of the temperature control valve, 36 ° C is maintained and supplied to the operating equipment as cooling water. In this case, the amount of high-temperature cooling water flowing through the bypass pipe increases as the sea water temperature is lower and the operation load of the ship is lower.

1 is a configuration diagram showing a conventional marine cooling system.

As shown in Fig. 1, a conventional marine cooling system includes a fresh water cooling pump 10 for pumping incoming fresh water, a main sea water cooling pump 20 for pumping seawater flowing through the seawater inlet 1, And a cooler (30) for cooling the fresh water flowing from the pump (10) through the sea water flowing from the main sea water cooling pump (20). A flow control valve 40 and a temperature sensing sensor 50 are provided on a connection pipe 31 for supplying the cooling water cooled by the cooler 30 to the operation equipment. A fresh water bypass pipe 11 for bypassing fresh water to the operation equipment without passing through the cooler is installed.

The cooling system adjusts the amount of the cooling water through the flow control valve 40 according to the cooling water temperature sensed by the temperature sensing sensor 50.

However, in general, the operation of the ship as a design standard of the centralized fresh water cooler is extremely small. However, regardless of the operating conditions of the ship, the main seawater cooling pump 20 is designed for the maximum load operation of the ship There is a problem that energy is wasted due to the presence of high temperature cool fresh water passing through the bypass pipe 11 as the capacity is sent to the cooler 30.

In order to solve the problem of the cooling system described above, the cooling system can be configured to eliminate the fresh water bypass pipe and appropriately change the rotation number of the main seawater cooling pump according to the cooling water temperature value supplied to the operation equipment. The energy can be saved by lowering the load of the main seawater cooling pump.

However, when the cooling system is configured as described above, when the temperature of the cooling water supplied to the operation equipment is lower than a set value (for example, 10 ° C) in accordance with the ship operating conditions such as low operating load, Excessive cooling of the main lubricating oil cooler, which is one of the equipment to be cooled, may increase the viscosity of the lubricating oil, thereby limiting the operation of the main engine.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a stable cooling system for a ship that allows a ship to operate stably regardless of the ship operating conditions.

In order to achieve the above object, a stabilized cooling system of a ship according to the present invention is a system for cooling an operating equipment installed in a ship, comprising: a fresh water cooling pump for pumping incoming fresh water; A main seawater cooling pump for pumping seawater flowing through the seawater inlet; A cooler for cooling the fresh water introduced from the fresh water cooling pump through sea water flowing from the main sea water cooling pump; A first temperature sensing sensor installed on a connection pipe for supplying cooling water cooled in the cooler to the operation equipment; A control panel for receiving the cooling water temperature value sensed by the first temperature sensing sensor and controlling the main seawater cooling pump according to the received temperature value; A connection pipe that is cooled in the cooler and supplies the cooling water that has passed through the first temperature sensor to the operation equipment, and a bypass pipe that bypasses the fresh water pumped by the fresh water cooling pump to the operation device without passing through the cooler A flow control valve; A second temperature sensor installed on the connection pipe for sensing the temperature of the cooling water passing through the flow control valve; And a valve controller for receiving the temperature value of the coolant sensed by the second temperature sensor and controlling the flow rate control valve according to the received temperature value.

The cooling system may further include a frequency converter between the control panel and the main seawater cooling pump for receiving a control signal from the control panel and controlling the number of revolutions of the main seawater cooling pump through frequency conversion.

The control panel may further include a step of determining whether a cooling water temperature value received from the first temperature sensor is equal to or lower than a first predetermined temperature value; Determining whether the received temperature value is lower than a second set temperature value if the received temperature value is lower than the first set temperature value; Determining whether the number of revolutions of the main seawater cooling pump is equal to or greater than a set minimum number of revolutions when the received temperature value is equal to or less than a second set temperature value (first set temperature value> second set temperature value); Reducing the number of revolutions of the main seawater cooling pump by a predetermined number of revolutions when the number of revolutions of the main seawater cooling pump is not less than the minimum number of revolutions; Feedback to the step of judging whether the temperature value received from the first temperature sensor is below the first set temperature value when a predetermined time has elapsed, controlling the main seawater cooling pump through the saving mode control logic, The valve controller may include a step of determining whether the cooling water temperature value received from the second temperature sensor is equal to or lower than a third set temperature value (second set temperature value> third set temperature value); Controlling the flow rate control valve to maintain the received temperature value equal to or higher than the third set temperature value if the received temperature value is equal to or lower than the third set temperature value; And feedback to the step of determining whether the cooling water temperature value received from the second temperature sensing sensor is equal to or lower than the third predetermined temperature value when a predetermined time has elapsed, by controlling the flow rate control valve through the stable mode control logic .

In this case, the control panel may determine that the temperature value received from the first temperature sensor is below the first set temperature value; Determining whether the number of rotations of the main seawater cooling pump is equal to or less than a predetermined maximum number of rotations if the received temperature value is not less than the first set temperature value; Increasing the number of revolutions of the main seawater cooling pump by a predetermined number of revolutions when the number of revolutions of the main seawater cooling pump is not more than the maximum number of revolutions; And feedback to the step of determining whether the temperature value received from the first temperature sensor is below the first set temperature value when a predetermined time has elapsed, by controlling the main sea water cooling pump through the saving mode control logic .

In addition, the cooling system can continuously lower the cooling water temperature according to the ship operating conditions so that the target rotation speed can be maintained when the rotation speed of the main sea water cooling pump reaches the set target rotation speed (target rotation speed> minimum rotation speed) have.

According to the present invention, since the temperature of the cooling water supplied to the main lubricating oil cooler is maintained at a set value or higher, the viscosity of the lubricating oil is prevented from being excessively increased so that the main engine operation is smoothly performed. .

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

2 is a schematic view showing a stable cooling system of a ship according to the present invention.

The stabilized cooling system of a ship according to the present invention is a system in which operating equipment such as a main engine, a generator engine, and the like installed in a ship is cooled, and operation equipment can be stably operated. As shown in the drawing, the internal cooling system of a ship according to the present invention includes a fresh water cooling pump 110, a main sea water cooling pump 120, a cooler 130, a first temperature sensor 140, 150, a frequency converter 160, a flow control valve 170, a second temperature sensor 180, and a valve controller 190.

The fresh water cooling pump 110 may include a plurality of pumps (three in FIG. 2) and pumps incoming fresh water. The main sea water cooling pump 120 is connected to a plurality of pumps ) And pumped seawater flowing through the seawater inlet (1).

The cooler 130 may include a plurality of coolers (two in FIG. 2) to cool the fresh water flowing from the fresh water cooling pump 110 through the sea water flowing from the main sea water coolant pump 120.

The first temperature sensing sensor 140 is installed on a connection pipe 132 for supplying cooling water cooled by the cooler 130 to external operation equipment (not shown).

The control panel 150 is a kind of central processing unit that receives the temperature value of the cooling water sensed by the first temperature sensor 140 and appropriately controls the number of rotations of the main seawater cooling pump 120 according to the received temperature value .

The frequency converter 160 receives a predetermined control signal from the control panel 150 and controls the frequency of the main sea water cooling pump 120 through the control panel 150 and the main sea water cooling pump 120).

The flow control valve 170 includes a connection pipe 132 that is cooled in the cooler 130 and supplies the cooling water having passed through the first temperature sensor 140 to the operation equipment and a fresh water pumped by the fresh water cooling pump 110, Is bypassed to the operating equipment without passing through the cooler. That is, the cooling water supplied from the cooler 130 and the fresh water pumped by the fresh water cooling pump 110 to bypass the bypass pipe 112 are properly adjusted.

The second temperature sensing sensor 180 is installed on the connection pipe 132 to sense the temperature of the cooling water passing through the flow control valve 170.

The valve controller 190 controls the flow rate control valve 170 according to the temperature value of the cooling water sensed by the second temperature sensor 180.

The control logic of the stable cooling system of the ship according to the present invention can be broadly classified into a direct on-line (DOL) mode and a frequency mode.

First, in the direct on-line (DOL) mode, the standby pump of the main seawater cooling pump 120 detects the low pressure of the seawater pipe due to an abnormality or trip of the operation pump of the main seawater cooling pump 120 It starts. The main seawater cooling pump 120 has a standby pump control function.

The frequency mode is a mode that is automatically controlled by the temperature sensor 140 and can be manually selected when the main seawater cooling pump 120 in the DOL mode is being driven. When the operation pump of the main seawater cooling pump 120 is normally operating in the remote mode, the operation pump of the main seawater cooling pump 120 is automatically changed to the frequency control pump. At this time, the standby pump of the main seawater cooling pump 120 must be interlocked. The control panel 150 outputs a predetermined control signal in the control signal range (for example, 4 mA-min. Rpm, 20 mA-max. Rpm) to the frequency converter 160 ).

On the other hand, the control signal range Min. rpm to Max. (for example, 70%), the seawater temperature is lowered, or the low-temperature fresh water coolant temperature at the time of low load of the system is continuously lowered, thereby reducing the fuel consumption of the main engine and the power generation engine.

If the operation pump of the main seawater cooling pump 120 is abnormal or the frequency converter 160 is abnormal, the frequency mode is automatically changed to the DOL mode. In this case, the standby pump of the main seawater cooling pump 120 is automatically started.

If the standby pump of the main seawater cooling pump 120 is to be changed to the frequency mode after the standby start, it must be changed to manual mode.

FIG. 3 is a first control flowchart of a stable cooling system of a ship according to the present invention, which is a logic that is controlled so as to save energy by a control panel.

First, the control panel 150 of the cooling system determines whether the cooling water temperature value received from the first temperature sensor 140 is equal to or lower than a first set temperature value (for example, 36 ° C) (S110) When the value is equal to or lower than the first set temperature value, it is determined whether the second set temperature value is equal to or lower than the second set temperature value (e.g., 34 ° C) (S120).

When the received temperature value is equal to or lower than the second set temperature value, it is determined that the number of rotations of the main seawater cooling pump 120 is equal to or larger than the set minimum number of rotations. The number of revolutions of the seawater cooling pump 120 is reduced by a predetermined number of revolutions (e.g., 20 rpm) (S130) (S140). If a predetermined time (e.g., 5 min.) Has elapsed, the process returns to step S110 (step S150). In this way, the load of the main seawater cooling pump 120 is reduced by changing the rotation number of the main seawater cooling pump 120 according to the cooling water temperature value sensed by the first temperature sensor 140, thereby saving energy.

At this time, in order to maintain the target rotational speed when the rotational speed of the main sea water cooling pump 120 reaches the set target rotational speed (target rotational speed> minimum rotational speed), the cooling system The control function of the rotation speed of the seawater cooling pump 120 is cut off and the cooling water temperature can be continuously lowered according to the ship operating conditions.

On the other hand, when the temperature value received from the first temperature sensor 150 is not less than the first set temperature value, that is, when the temperature value received from the first temperature sensor 150 is greater than the first set temperature value, It is determined that the number of revolutions of the main circulation pump 120 is equal to or less than the set maximum number of rotations. If the number of revolutions of the main circulation pump 120 is equal to or less than the maximum number of revolutions, (S110), (S160), (S170). If a predetermined time (e.g., 5 min.) Has elapsed, the flow returns to step S110 (step S180).

FIG. 4 is a second control flowchart of a stable cooling system of a ship according to the present invention, and is a logic that is controlled so that a ship can stably operate by a valve controller.

First, when the cooling water temperature value sensed by the second temperature sensing sensor 180 reaches a third set temperature value (for example, 10 DEG C) while the cooling system is controlled by the control logic by the control panel, the valve controller 190 Controls the flow rate control valve 170 so as to maintain the third set temperature value or more (S210) (S220). That is, the flow rate control valve 170 is controlled to appropriately adjust the flow rate of the clear water to be bypassed with the cooling water so that the temperature of the cooling water flowing out to the operation equipment is maintained to be equal to or higher than the third set temperature value.

If a predetermined time (e.g., 5 min.) Has elapsed, the process returns to step S210 (step S230).

Thus, it is possible to maintain the temperature of the cooling water supplied to the main lubricant cooler through the configuration of the flow rate control valve 170, the second temperature sensor 180 and the valve controller 190 at the set temperature or higher, So that stable operation can be achieved by smoothly operating the main engine.

The operation of the stabilized cooling system of the ship according to the present invention will be described.

First, the first set temperature value is set to 36 DEG C, the second set temperature value is set to 34 DEG C, the target number of revolutions is set to 70% of the maximum number of revolutions, and the third set temperature value is set to 10 DEG C I suppose.

If the temperature sensed by the first temperature sensor 140 of the cooling system exceeds 36 DEG C, the speed of the main seawater cooling pump 120 is automatically increased by 30 rpm at the current speed. The speed of the main seawater cooling pump 120 is continuously increased by 30 rpm at a time until the temperature sensed by the first temperature sensor 140 becomes 34 ° C or less. If the temperature sensed by the first temperature sensing sensor 140 is a value between 34 and 36 ° C, the speed of the main seawater cooling pump 120 maintains its current state.

If the temperature sensed by the first temperature sensor 140 falls below 34 ° C, the speed of the main seawater cooling pump 120 is automatically reduced by 20 rpm at the current speed. When the temperature sensed by the first temperature sensor 140 is kept below 34 ° C, the speed of the main seawater pump 120 is continuously decreased by 20 rpm at a time. At this time, when the speed of the main seawater cooling pump 120 decreases to reach the target revolving speed, the current target revolving speed can be maintained without further decreasing the speed of the main seawater cooling pump 120. [ In this case, the cooling water temperature of the fresh water is lowered and the fuel consumption of the main engine and the power generation engine can be reduced. The time interval setting between the above steps is adjustable.

If the temperature value of the cooling water sensed by the second temperature sensor 180 reaches 10 ° C, the valve controller 190 maintains the cooling water temperature value at 10 ° C or higher so that the viscosity of the lubricant due to excessive cooling of the main lubricant cooler The flow control valve 170 is controlled to control the flow rate of the cooling water cooled in the cooler 130 and the flow rate of clean water that is pumped in the fresh water cooling pump 110 and bypassed without passing through the cooler. That is, the flow rate control valve 170 is controlled to control the flow rate ratio of the cooling water and clean water supplied to the operation equipment so that the operation equipment can operate stably.

Although the stable cooling system of the ship according to the present invention has been described according to the limited embodiments, the scope of the present invention is not limited to the specific embodiments, Various modifications, alterations, and changes may be made without departing from the scope of the present invention.

1 is a schematic view showing a cooling system of a conventional ship;

2 is a schematic view showing a stable cooling system of a ship according to the present invention;

3 is a first control flow diagram of a stable cooling system of a ship according to the present invention.

4 is a second control flow diagram of a stable cooling system of a ship in accordance with the present invention;

DESCRIPTION OF THE REFERENCE NUMERALS

110: fresh water cooling pump 112: bypass pipe

120: main seawater cooling pump 130: cooler

132: connection piping 140: first temperature sensor

150: Control panel 160: Frequency converter

170: Flow control valve 180: Second temperature sensor

190: Valve controller

Claims (5)

A system for cooling operating equipment installed on a ship, A fresh water cooling pump for pumping the incoming fresh water; A main seawater cooling pump for pumping seawater flowing through the seawater inlet; A cooler for cooling the fresh water introduced from the fresh water cooling pump through sea water flowing from the main sea water cooling pump; A first temperature sensing sensor installed on a connection pipe for supplying cooling water cooled in the cooler to the operation equipment; A control panel for receiving the cooling water temperature value sensed by the first temperature sensing sensor and controlling the main seawater cooling pump according to the received temperature value; A connection pipe that is cooled in the cooler and supplies the cooling water that has passed through the first temperature sensor to the operation equipment, and a bypass pipe that bypasses the fresh water pumped by the fresh water cooling pump to the operation device without passing through the cooler A flow control valve; A second temperature sensor installed on the connection pipe for sensing the temperature of the cooling water passing through the flow control valve; And a valve controller for receiving the coolant temperature value sensed by the second temperature sensor and controlling the flow rate control valve according to the received temperature value. The cooling system according to claim 1, Further comprising a frequency converter between the control panel and the main seawater cooling pump for receiving a control signal from the control panel and controlling the number of revolutions of the main seawater cooling pump through frequency conversion. The control panel according to claim 2, Determining whether the cooling water temperature value received from the first temperature sensor is equal to or lower than a first set temperature value; Determining whether the received temperature value is lower than a second set temperature value if the received temperature value is lower than the first set temperature value; Determining whether the number of revolutions of the main seawater cooling pump is equal to or greater than a set minimum number of revolutions when the received temperature value is equal to or less than a second set temperature value (first set temperature value> second set temperature value); Reducing the number of revolutions of the main seawater cooling pump by a predetermined number of revolutions when the number of revolutions of the main seawater cooling pump is not less than the minimum number of revolutions; And feedback to the step of determining whether the temperature value received from the first temperature sensor is below a first set temperature value when a predetermined time has elapsed, controlling the main sea water cooling pump through the saving mode control logic, Wherein the valve controller comprises: Determining whether the cooling water temperature value received from the second temperature sensor is equal to or less than a third set temperature value (a second set temperature value> a third set temperature value); Controlling the flow rate control valve to maintain the received temperature value equal to or higher than the third set temperature value if the received temperature value is equal to or lower than the third set temperature value; And a feedback step of judging whether the cooling water temperature value received from the second temperature sensor is equal to or lower than a third set temperature value when a predetermined time has elapsed, characterized by controlling the flow rate control valve through the stable mode control logic A stable cooling system of the ship. The control panel according to claim 2, Determining whether a temperature value received from the first temperature sensor is below a first set temperature value; Determining whether the number of rotations of the main seawater cooling pump is equal to or less than a predetermined maximum number of rotations if the received temperature value is not less than the first set temperature value;  Increasing the number of revolutions of the main seawater cooling pump by a predetermined number of revolutions when the number of revolutions of the main seawater cooling pump is not more than the maximum number of revolutions; And feedback to the step of determining whether the temperature value received from the first temperature sensor is below a first set temperature value when a predetermined time has elapsed, characterized by controlling the main seawater cooling pump through the saving mode control logic, A stable cooling system of the ship. The cooling system according to claim 3, Characterized in that the cooling water temperature is continuously lowered according to the ship operating conditions so that the target rotation speed can be maintained when the rotation speed of the main sea water cooling pump reaches the set target rotation speed (target rotation speed> minimum rotation speed) .

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