JP4752859B2 - Ship propulsion system - Google Patents

Description

  The present invention relates to a ship propulsion system capable of saving energy of a ship.

  Usually, as an energy-saving method in ship propulsion systems, the main engine exhaust gas is supplied to the economizer to generate steam to drive the turbine to generate power and propulsion, or the main engine exhaust gas to drive the power turbine / generator. A method of generating electricity or a method of generating electricity by attaching a generator to a supercharger of a main engine has been proposed. However, such a method has not generally spread due to problems of installation space and maintenance cost.

A conventional marine vessel propulsion system will be described with reference to FIG. 6. As shown in FIG. 6 is electrically connected to the second generator motor 10 installed through the connector 6. When the main machine 1 rotates the propeller 2 with a low load, the first generator motor 5a is driven by the power generated by the second generator motor 10 to energize the supercharger 4, and the main machine 1 rotates the propeller 2 at rated operation. In some cases, the second generator motor 10 is driven by the electric power generated by the first generator motor 5a to energize the main engine 1 (see Patent Document 1). Since the response of the number is shifted, a large load may be applied to the speed reducer 6 and the reliability is lowered. In general, the turbocharger is operated at several tens of thousands of revolutions and the main engine is operated at a low speed of several tens of revolutions. Therefore, a multistage reduction gear is required to match the number of revolutions. Maintenance costs increase and reliability decreases.

  Further, another conventional ship propulsion system will be described with reference to FIG. 7. The propulsion boosting turbine 9 is driven by surplus steam generated by the exhaust gas economizer 7 and the propulsion force is boosted to the propeller 2 via the speed reducer 6. (See Patent Document 2). In addition, 4 is a supercharger, 5b is a generator, 8 is a steam turbine.

In the ship propulsion system as shown in FIG. 7, it is difficult to finely control the amount of steam generated by the exhaust gas economizer 7 when the load on the main engine 1 fluctuates. It is difficult to follow the above, and there is a case where a large load is applied to the speed reducer 6 and the reliability is lowered. Moreover, since the rotation speed of the main machine 1 is operated at a low speed of several tens of rotations, a multi-stage reduction gear is required to match the rotation speed, resulting in an increase in installation space and maintenance cost.
Japanese Examined Patent Publication No. 63-5565 Japanese Patent Publication No. 61-55602

  The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a ship propulsion system that can save energy with an optimum equipment configuration, has high efficiency, and can cope with various ship operating conditions. is there.

To achieve the above object, a first aspect of the present invention, a supercharged main engine propeller connected by propeller shaft, the shaft drive generator provided in the propeller shaft, which is connected to the shaft drive generator In a marine vessel propulsion system provided with a frequency converter, a high-speed generator that is directly connected to the supercharger of the main engine and collects surplus exhaust energy to generate power, and a connection between the frequency converter and the inboard power system A first circuit breaker and a second circuit breaker that connects the high-speed generator to the connection portion of the frequency converter and the first circuit breaker, and the shaft-driven generator is used as a propulsion motor, The first circuit breaker is opened and the second circuit breaker is closed, and the electric power generated by the high-speed generator is converted to the rotation frequency of the main engine by the frequency converter through the second circuit breaker. To the shaft drive generator When the shaft-driven generator is used as a generator, the frequency converter converts the electric power generated by the shaft-driven generator with the first circuit breaker closed and the second circuit breaker opened. And converting to an inboard power supply frequency and supplying to the inboard power supply system .

According to a second aspect of the present invention, a marine vessel propulsion including a main engine with a supercharger and a propeller connected by a propulsion shaft, a shaft drive generator provided on the propulsion shaft, and a frequency converter connected to the shaft drive generator. In the system, a high-speed generator that is directly connected to the supercharger of the main engine and collects surplus exhaust energy to generate electric power, a first circuit breaker that connects the frequency converter and the inboard power supply system, and the shaft-driven power generation A third circuit breaker for connecting the device and the frequency converter, and the high-speed generator connected to the contact on the first circuit breaker side of the frequency converter or the third circuit breaker of the frequency converter. A switching device connected to a contact on the side, and when the power generated by the high-speed generator is supplied to the inboard power system, the third circuit breaker is opened, the first circuit breaker is closed, and the switching Device is connected to the contact on the third circuit breaker side When the electric power generated by the high-speed generator is converted to the frequency of the inboard power system by the frequency converter through the switch and supplied to the inboard power system, and the shaft drive generator is used as a propulsion motor The first circuit breaker is opened, the third circuit breaker is closed, the switch is connected to a contact on the first circuit breaker side, and the electric power generated by the high-speed generator is passed through the switch. The frequency converter converts the rotational frequency of the main engine to supply to the shaft-driven generator .

  According to the present invention, the power generated by the generator directly connected to the supercharger can be immediately converted to the frequency desired by the main engine by the frequency converter, and the shaft-driven generator can be propelled and added as an electric motor. Even when the load is not applied to the propulsion motor, the reliability is improved. In addition, a multistage reduction gear for adjusting the number of rotations is not required, so that the installation cost can be reduced, the degree of freedom of equipment arrangement can be improved, and the load of cargo and the like can be increased and the maintenance cost can be reduced. In addition, when the shaft-driven generator breaks down and power cannot be supplied to the ship, the power generated by the generator directly connected to the turbocharger is immediately converted to the ship power frequency via the frequency converter. Since the power can be supplied to the power supply system, the redundancy of the system is improved. Therefore, it is possible to provide a ship propulsion system that is highly energy efficient with an optimum device configuration and that can cope with various operating conditions of the ship.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the best embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a configuration diagram of a first embodiment of the present invention, which is an example applied to an inline-type shaft drive power generation system.

As shown in FIG. 1 , in the present embodiment, the main machine 1 and the propeller 2 are connected by a propulsion shaft 3, and a shaft drive generator 11 a is installed on the propulsion shaft 3. The main engine 1 is provided with a supercharger 4 driven by main engine exhaust gas, and a high speed generator 16 is directly connected to the supercharger 4. The high speed generator 16 is connected to the inboard power supply system 15 through the circuit breakers 14b and 14a. The shaft drive generator 11a is connected to the inboard power supply system 15 via the frequency converter 12 and the circuit breaker 14a. The synchronous phase adjuster 13 adjusts the output voltage and frequency of the shaft drive generator 11a.

  Next, the operation of the present embodiment will be described. When the shaft-driven generator 11a is used as a generator, the generated power is converted into an inboard power supply frequency by the frequency converter 12, the circuit breaker 14a is closed, and the circuit breaker 14b is closed. Is opened and connected to the inboard power supply system 15. Further, when the shaft drive generator 11a is driven as a propulsion motor and the main machine 1 is propelled and energized, the circuit breaker 14a is opened, the circuit breaker 14b is closed, and the power generated by the high speed generator 16 directly connected to the turbocharger 4 Is converted into the rotational frequency of the main machine 1 via the frequency converter 12 and supplied with power.

  Since the present embodiment is configured as described above, the power generated by the generator 16 directly connected to the supercharger 4 can be immediately converted to the frequency desired by the main engine 1 by the frequency converter 12 and propulsion-assisted. Therefore, even when the load of the main engine 1 is changed, a large load is not applied to the propulsion motor, and the reliability is improved. In addition, a multistage reduction gear for adjusting the number of rotations is not required, the equipment installation space is reduced and the degree of freedom of equipment arrangement is improved, and the maintenance cost can be reduced along with the increase in the load of cargo and the like.

Next, modified examples of the present embodiment will be described with reference to FIGS.
FIG. 2 is a first modification of the first embodiment of FIG. 1 and is an example applied to an overhang type shaft drive power generation system. That is, in this modification, the main machine 1 and the propeller 2 are connected by the propulsion shaft 3, the shaft drive generator 11 b is installed at the shaft end of the main machine 1, and connected to the inboard power system 15 via the frequency converter 12 through the circuit breaker 14 a. It is connected. The main engine 1 is provided with a supercharger 4 driven by main engine exhaust gas, and a high speed generator 16 is directly connected to the supercharger 4 . The high speed generator 16 is connected to the inboard power supply system 15 through the circuit breakers 14b and 14a.
In the first modification of the first embodiment, when the shaft-driven generator 11b is propelled and energized with the electric power generated by the high-speed generator 16, the breaker 14b is closed and the breaker 14a is opened, so that the high-speed generator the electric power generated by the 16 breaker 14b menstrual immediately converted to Kase promote supplies to the shaft driving the generator 11 b in the desired frequency by the frequency converter 12. The synchronous phase adjuster 13 adjusts the output voltage and frequency of the shaft drive generator 11b.

FIG. 3 shows a second modification of the first embodiment, which is an example applied to a step-up type shaft drive power generation system. That is, in this modification, the shaft drive generator 11 c is installed via the step-up gear 17 provided on the propulsion shaft 3 between the main machine 1 and the propeller 2. The main engine 1 is provided with a supercharger 4 driven by main engine exhaust gas, and a high speed generator 16 is directly connected to the supercharger 4 . The high speed generator 16 is connected to the inboard power supply system 15 through the circuit breakers 14b and 14a.
In the second modification of the first embodiment, when the shaft-driven generator 11c is propelled and energized with the electric power generated by the high-speed generator 16, the breaker 14b is closed and the breaker 14a is opened, so that the high-speed generator The electric power generated at 16 is immediately converted into a desired frequency by the frequency converter 12 via the circuit breaker 14b, and supplied to the shaft drive generator 11c for propulsion. Synchronous phase 13 adjusts the output voltage and frequency of the shaft driving the generator 11 c.

FIG. 4 shows a third modification of the first embodiment, which is an example applied to a power take-off type shaft drive power generation system. That is, in this modification, the shaft drive generator 11d is installed via the step-up gear 17 provided in the main machine 1. The main engine 1 is provided with a supercharger 4 driven by main engine exhaust gas, and a high speed generator 16 is directly connected to the supercharger 4 . The high speed generator 16 is connected to the inboard power supply system 15 through the circuit breakers 14b and 14a.
In the third modification of the first embodiment, when the shaft-driven generator 11d is propelled and energized with the electric power generated by the high-speed generator 16, the breaker 14b is closed and the breaker 14a is opened, and the high-speed generator the electric power generated by the 16 breaker 14b menstrual immediately converted to Kase promote supplies to the shaft driving the generator 11 d and the desired frequency by the frequency converter 12. Synchronous phase 13 adjusts the output voltage and frequency of the shaft driving the generator 11 d.

  Since the functions and effects other than the functions and effects described above are the same as those of the first embodiment, the first to third modifications of FIGS. 2 to 4 will not be described.

  FIG. 5 is a block diagram of the second embodiment of the present invention. The same components as those of the first embodiment of FIG.

As shown in FIG. 5 , in this embodiment, the main machine 1 and the propeller 2 are connected by a propulsion shaft 3, and a shaft drive generator 11 a is installed on the propulsion shaft 3. The main engine 1 is provided with a supercharger 4 driven by main engine exhaust gas, and a high speed generator 16 is directly connected to the supercharger 4. Fast generator 16 is adapted to be connected to the contact point 19b of the contact 19a or the shaft driving the generator 11a of the inboard power supply system 15 side of the frequency converter 12 by switch 18. Moreover, the shaft drive generator 11a can be connected to the inboard power supply system 15 via the circuit breaker 14c, the frequency converter 12, and the circuit breaker 14a. The synchronous phase adjuster 13 adjusts the output voltage and frequency of the shaft drive generator 11a.

  Since the present embodiment is configured as described above, for example, when the shaft drive generator 11a fails and power cannot be supplied to the ship, the circuit breaker 14c is opened, and the circuit breaker 14a is closed and switched. The power generated by the high-speed generator 16 directly connected to the supercharger 4 by connecting the battery 18 to the contact 19b is immediately converted into the ship power frequency via the frequency converter 12, and supplied to the ship power system 15. it can. Thus, when the shaft drive generator 11a fails, the power generated by the generator 16 directly connected to the turbocharger 4 can be immediately converted to the inboard power frequency by the frequency converter 12 and supplied to the inboard power system 15. System redundancy can be improved. In addition, when the shaft drive generator 11a is operating normally, it has the same function as the first embodiment of FIG. 1 and the same effect is obtained.

The block diagram of 1st Embodiment of this invention. The block diagram of the 1st modification of 1st Embodiment of this invention. The block diagram of the 2nd modification of 1st Embodiment of this invention. The block diagram of the 3rd modification of 1st Embodiment of this invention. The block diagram of 2nd Embodiment of this invention. The block diagram of the conventional ship propulsion system. The block diagram of the other conventional ship propulsion system.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Main machine, 2 ... Propeller, 3 ... Propulsion shaft, 4 ... Supercharger, 5a ... 1st generator motor, 5b ... Generator, 6 ... Reduction gear, 7 ... Exhaust gas economizer, 8 ... Steam turbine, 9 ... Propulsion Boost turbine, 10 ... second generator motor, 11a, 11b, 11c, 11d ... shaft drive generator, 12 ... frequency converter, 13 ... synchronous phase adjuster, 14a, 14b, 14c ... breaker, 15 ... inboard power system, 16 ... High-speed generator, 17 ... Step-up gear, 18 ... Switch, 19a, 19b ... Contact.

Claims (2)

The turbocharged main engine and the propeller are connected with the propeller shaft, the shaft drive generator provided in the propeller shaft, in a boat propulsion system comprising a connected frequency converter to the shaft drive generator,
And fast generator for generating electric power by recovering the excess exhaust energy is directly connected to the supercharger of the main machine,
A first circuit breaker for connecting between the frequency converter and the ship power system;
A second circuit breaker for connecting the high-speed generator to the connection portion of the frequency converter and the first circuit breaker;
When the shaft-driven generator is used as a propulsion motor, the first circuit breaker is opened and the second circuit breaker is closed, and the electric power generated by the high-speed generator is supplied to the second circuit breaker. Via the frequency converter to convert to the rotation frequency of the main machine to supply to the shaft drive generator,
When the shaft-driven generator is used as a generator, the first circuit breaker is closed and the second circuit breaker is opened, and the power generated by the shaft-driven generator is converted into the ship by the frequency converter. A ship propulsion system, wherein the ship propulsion system is converted into a power frequency and supplied to the ship power system. In a marine vessel propulsion system that connects a supercharger-equipped main engine and a propeller with a propulsion shaft, provides a shaft drive generator on the propulsion shaft, and includes a frequency conversion device connected to the shaft drive generator.
A high-speed generator directly connected to the supercharger of the main engine for recovering surplus exhaust energy and generating electricity;
,
A first circuit breaker for connecting between the frequency converter and the ship power system;
A third circuit breaker for connecting between the shaft drive power generator and the frequency converter;
A switch for connecting the high-speed generator to a contact on the first circuit breaker side of the frequency converter or a contact on the third circuit breaker side of the frequency converter;
When supplying electric power generated by the high-speed generator to the inboard power system, the third circuit breaker is opened, the first circuit breaker is closed, and the switch is used as a contact on the third circuit breaker side. The power generated by the high-speed generator connected and converted to the frequency of the inboard power system by the frequency converter through the switch and supplied to the inboard power system,
When the shaft-driven generator is used as a propulsion motor, the first circuit breaker is opened, the third circuit breaker is closed, and the switch is connected to a contact on the first circuit breaker side so that the high speed A marine vessel propulsion system , wherein power generated by a generator is converted into a rotation frequency of the main engine by the frequency converter through the switch and supplied to the shaft-driven generator .

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