JP2011031835A - Ship engine room ventilation system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce useless energy consumption by operating a ventilation system by necessary minimum power. <P>SOLUTION: This ship engine room ventilation system for sending outside air into an engine room of a ship as combustion air of a main engine 9, has a plurality of air supply ventilators 3 capable of driving an air supply fan 1 by a motor 2, a pressure sensor 10 (a load detecting means) for detecting scavenging pressure of the main engine 9 as a load of the main engine 9, and a control unit 11 for controlling a rotating speed of the motor 2 of the respective air supply ventilators 3 so as to realize a ventilation quantity corresponding to the load based on the load detected by the pressure sensor 10. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a ship engine room ventilation system for supplying combustion air of a main engine to an engine room of a ship.

  In general, a large vessel or the like employs a ventilation system in which outside air is taken in by a ventilator so that it can be ventilated into an engine room. This ventilation system allows air necessary for combustion of the main engine in the engine room. Is to be secured.

  As shown in FIG. 3, in this type of ventilation system, the supply fan 1 can be driven by a motor 2 in order to control the required air amount that changes according to the operational state (load of the main engine). A plurality of ventilators 3 are provided, and an engine member 4 manually operates the operation panel 5 while determining the load of the main engine (not shown) to determine the number of operating units.

  However, since the precise flow rate control cannot be performed in the control of the number of the air supply ventilators 3, the exhaust ventilator 8 is configured so that the exhaust fan 6 can be driven by the motor 7, and is required by the exhaust ventilator 8. In response to this, excess air is discharged from the engine room.

  In addition, as prior art document information related to the ventilation system employed in the engine room of a ship, for example, there is the following Patent Document 1.

JP 2008-254470 A

  However, in the conventional ventilation system as described above, the required air amount of the main engine varies finely according to the load, but it can be dealt with only by controlling the number of air supply ventilators 3, so ventilation to the engine room is possible. If the air flow cannot be satisfactorily followed by the increase or decrease in the required air amount of the main engine and the air flow rate to the engine room exceeds the required air amount, the energy that is wasted due to the difference in the ventilator power In addition, there is a problem that consumption occurs, and in addition, surplus air must be discharged from the engine room by driving the exhaust ventilator 8, resulting in excessive energy consumption.

  The present invention has been made in view of the above-described circumstances, and an object of the present invention is to reduce wasteful energy consumption so that the ventilation system can be operated with the minimum necessary power.

  The present invention relates to a ship engine room ventilation system for sending outside air as combustion air of a main engine to an engine room of a ship, a plurality of air supply ventilators configured to be able to drive an air supply fan with a motor, and a main engine Load detecting means for detecting the load of the air supply, and a control unit for controlling the rotational speed of the motor of each of the air supply ventilators so as to realize an air flow amount corresponding to the load based on the load detected by the load detecting means. It is characterized by having.

  Thus, in this way, the load of the main engine is detected by the load detecting means, and the motor of each of the air supply ventilators is controlled by the control unit based on the detected load. An air flow amount that is not excessive or deficient in accordance with the load of the engine is realized, and the air flow amount can be made to follow the required air amount that changes according to the load of the main engine.

  As a result, it is possible to prevent a situation in which the amount of ventilation to the engine room is much larger than the required amount of air, and there is no wasteful energy consumption due to the difference in ventilation power. The energy consumption can also be reduced by not having to discharge the excess air from the engine room.

  Furthermore, since it is not necessary for the engineer to manually operate the operation panel while checking the load on the main engine, the labor burden on the engineer is greatly reduced, and the skill of the engineer's operation technology is reduced. The possibility of affecting driving is avoided.

  Further, when carrying out the present invention more specifically, a load detection means is constituted by a pressure sensor that detects the scavenging air pressure of the main engine as a load of the main engine, and a detection signal from the pressure sensor is input to A controller for calculating the number of rotations of an air supply fan in each air supply ventilator for realizing a ventilation amount corresponding to the load of the main engine, and a motor of each air supply ventilator based on the calculated value in the controller It is possible to constitute a control unit with an inverter that changes the power supply frequency applied to.

  According to the ship engine room ventilation system of the present invention described above, various excellent effects as described below can be obtained.

(I) Achieving a sufficient air flow rate that matches the load on the main engine, and making it possible to follow the required air flow appropriately according to the load on the main engine, so the ventilation system is the minimum necessary. It is possible to reduce the wasteful energy consumption by operating with the power of the engine, which can greatly reduce the fuel cost and CO ₂ generation amount of the generator engine that covers the power in the ship. .

  (II) Since manual operation by engine members as in the past can be eliminated, the labor burden on the engine members can be greatly reduced, and the influence on the operation of the ventilation system due to the skill of the engine members' operation techniques. Can be excluded, and the operation of the ventilation system can be performed stably and appropriately.

It is the schematic which shows an example of the form which implements this invention. It is a graph which shows the relationship between the load of a main engine, and the ventilation volume. It is the schematic which shows a prior art example.

  Embodiments of the present invention will be described below with reference to the drawings.

  1 and 2 show an example of an embodiment for carrying out the present invention, and portions denoted by the same reference numerals as those in FIG. 3 represent the same items.

  As shown in FIG. 1, in the present embodiment, the engine member 4 (see FIG. 3) manually operates the operation panel 5 in the ventilation system of FIG. Instead of performing the number control, the main engine 9 is provided with a pressure sensor 10 (load detection means) for detecting the scavenging air pressure of the main engine 9 as a load, and each air supply ventilator 3 includes a motor 2. And a control unit 11 that controls the rotational speed of the air supply ventilator 3 so that the air supply ventilators 3 can realize an air flow amount corresponding to the scavenging air pressure based on the scavenging air pressure detected by the pressure sensor 10. is there.

  More specifically, the rotational speed of the air supply fan 1 in each of the air supply ventilators 3 for realizing a ventilation amount corresponding to the current load of the main engine 9 is calculated by inputting a detection signal from the pressure sensor 10. A control unit 11 is configured by a controller 12 and an inverter 13 that changes a power frequency applied to the motor 2 of each air supply ventilator 3 based on a value calculated by the controller 12.

  Here, when the controller 12 calculates the optimum rotational speed of the air supply fan 1 in each air supply ventilator 3, the load of the main engine 9 and the air flow rate have a relationship as shown in FIG. Therefore, this is replaced with the scavenging air pressure of the main engine 9 and the rotational speed of each air supply fan 1, and a table for uniquely determining the rotational speed from the scavenging air pressure of the main engine 9 is created. 12 and the optimum rotational speed may be read out from the table based on the scavenging air pressure of the main engine 9 measured by the pressure sensor 10, and in addition to this, the scavenging air pressure and the rotational speed may be read out. It is also possible to adopt a method of determining the rotation speed by selecting the lowest rotation speed in the past data while accumulating the past data and the determined rotation speed and actual power at that time.

  It is also possible to adopt a method of pursuing the lowest power value while variably controlling the rotational speed at any time using fuzzy control combined with fuzzy theory. You may make it carry out in combination with the method of determining rotation speed in light of data.

  Thus, when the ventilation system is configured in this way, the scavenging air pressure of the main engine 9 is detected by the pressure sensor 10, and the motor 2 of each air supply ventilator 3 is controlled by the control unit 11 based on the detected scavenging air pressure. Since the rotation speed is controlled by this, a ventilation amount that is not excessive or deficient corresponding to the load of the main engine 9 is realized, and the ventilation amount can be made to follow the required air amount that changes according to the load of the main engine 9 satisfactorily. Become.

  As a result, it is possible to prevent a situation in which the amount of ventilation to the engine room is much larger than the required amount of air, and there is no wasteful energy consumption due to the difference in ventilation power. The energy consumption can also be reduced by not having to discharge the excess air from the engine room.

  Further, since the engine member 4 does not need to manually operate the operation panel while confirming the load of the main engine 9, the labor burden of the engine member 4 is greatly reduced, and the operation skill of the engine member 4 is improved. The possibility of affecting the operation of the ventilation system is avoided.

Therefore, according to the above embodiment, it is possible to realize an air flow amount that is not excessive or deficient in accordance with the load of the main engine 9 and to follow the air flow amount well with the required air amount that changes according to the load of the main engine 9. Therefore, it is possible to operate the ventilation system with the minimum necessary power, and to reduce wasteful energy consumption. As a result, the fuel cost of the generator engine that covers the power in the ship and the amount of CO ₂ generated Can be greatly reduced.

  In addition, since the conventional manual operation by the engine member 4 can be eliminated, the labor burden of the engine member 4 can be greatly reduced, and the operation of the ventilation system by the skill of the operation technique of the engine member 4 can be reduced. Can be excluded, and the operation of the ventilation system can be performed stably and appropriately.

  Note that the ship engine room ventilation system of the present invention is not limited to the above-described embodiment, and a case where a pressure sensor that detects the scavenging pressure of the main engine as a load of the main engine is adopted as the load detection means. Although described as an example, a detector that detects the main engine shaft horsepower, the turbocharger rotation speed, the rack scale (scale for displaying the main engine output), and the like as the load of the main engine may be employed as the load detection means. Of course, various changes can be made without departing from the scope of the present invention.

DESCRIPTION OF SYMBOLS 1 Air supply fan 2 Motor 3 Air supply ventilator 9 Main engine 10 Pressure sensor (load detection means)
11 Control unit 12 Controller 13 Inverter

Claims (2)

  A ship engine room ventilation system that sends outside air to the engine room of the ship as combustion air of the main engine, which detects the load on the main engine and multiple supply air ventilators that can drive the supply fan with a motor. And a control unit for controlling the rotational speed of the motor of each air supply ventilator so as to realize a ventilation amount corresponding to the load based on the load detected by the load detection unit. Ship engine room ventilation system.   A load sensor is configured by a pressure sensor that detects the scavenging air pressure of the main engine as a load of the main engine, and a detection signal from the pressure sensor is input to realize a ventilation amount suitable for the current load of the main engine. A control unit is configured by a controller that calculates the rotation speed of the air supply fan in each air supply ventilator and an inverter that changes the power supply frequency applied to the motor of each air supply ventilator based on the value calculated by the controller The ship engine room ventilation system according to claim 1, wherein the ship engine room ventilation system is provided.

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