JP2011132878A - Propulsion device and ship equipped with the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a propulsion device capable of reducing an installation cost and excelling in reliability, and to provide a ship equipped with the same. <P>SOLUTION: The propulsion device includes a propulsion steam turbine 2 including a high-pressure turbine 4 and a low-pressure turbine 3 connected in parallel to the high-pressure turbine 4, a high-pressure turbine side shaft generator 21 connected to the high-pressure turbine 4, a reduction gear 9 connecting the high-pressure turbine 4 to the low-pressure turbine 3, a propeller shaft 15 connected to the reduction gear 9, and a propeller 16 provided at the propeller shaft 15. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a propulsion device and a ship including the same, and more particularly to a shaft generator driven by a marine propulsion steam turbine.

  Generally, the shaft generator driven by the propulsion steam turbine provided in the ship is provided on the propulsion shaft (for example, Patent Document 1).

JP-A-55-92600

However, in the case of the propulsion steam turbine having the forward low-pressure turbine and the forward high-pressure turbine, the output of the propulsion steam turbine is transmitted to the propulsion shaft as one output via the reduction gear. The propulsion shaft drives a propeller provided on the propulsion shaft. At this time, the rotational speed of the propulsion shaft is decelerated by the reduction gear so that the rotational speed is suitable for the propulsion efficiency of the propeller. Therefore, the number of revolutions of the propulsion shaft is low, and there is a problem that the shaft generator provided on the propulsion shaft is enlarged.
In the invention described in Patent Document 1, when the propulsion steam turbine is operated at a partial load, the amount of steam supplied to the propulsion steam turbine is reduced and the forward steam turbine is moved between the forward low pressure turbine and the forward high pressure turbine. The output difference becomes larger. For this reason, there has been a problem in that the reduction gear connecting the forward low-pressure turbine and the forward high-pressure turbine is caused to come into contact with one another and wear the gears of the reduction gear.

  This invention is made | formed in view of such a situation, Comprising: It aims at providing the propulsion apparatus which can reduce installation cost, and was excellent in reliability, and a ship provided with the same.

In order to solve the above-mentioned problems, the propulsion device of the present invention and a ship equipped with the same employ the following means.
That is, according to the propulsion device according to the present invention, a propulsion steam turbine including a high pressure turbine and a low pressure turbine connected in parallel to the high pressure turbine, and a high pressure turbine side shaft generator connected to the high pressure turbine, And a reduction gear connecting the high-pressure turbine and the low-pressure turbine, a propulsion shaft connected to the reduction gear, and a propulsion device provided on the propulsion shaft.

  The output of the propulsion steam turbine is transmitted to the propulsion shaft with the output of the low-pressure turbine and the output of the high-pressure turbine as one output via the reduction gear. The propulsion shaft to which the output is transmitted is driven so as to have a rotation speed suitable for the propulsion efficiency of the propulsion device provided on the propulsion shaft. Therefore, the rotation speed of the propulsion shaft is lower than the rotation speeds of the low-pressure turbine and the high-pressure turbine. Therefore, when a shaft generator is provided on the propulsion shaft, the shaft generator is increased in size.

  Therefore, in the present invention, the high pressure turbine side shaft generator is connected to the high pressure turbine. Thereby, the rotation speed can be increased and the high-pressure turbine side shaft generator can be driven. Therefore, the size of the high-pressure turbine side shaft generator can be reduced. Therefore, the space for installing the high-pressure turbine side shaft generator can be reduced, and the installation cost of the high-pressure turbine side shaft generator can be reduced.

  Furthermore, according to the propulsion device according to the present invention, the low pressure turbine is connected to a low pressure turbine side shaft generator, and the high pressure turbine side shaft generator and the low pressure turbine side shaft generator are electrically connected. It is characterized by that.

  At the time of partial load operation of the propulsion steam turbine, the amount of steam supplied to the propulsion steam turbine is reduced as compared with the rated load operation of the propulsion steam turbine. Since the amount of steam supplied to the propulsion steam turbine is reduced, the output of the low-pressure turbine is greatly reduced as compared with the output of the high-pressure turbine. As a result, the output balance between the low-pressure turbine and the high-pressure turbine connected to the speed reducer is biased. For this reason, the gears of the speed reducer may come into contact with each other to cause damage such as wear or breakage of the gears.

Therefore, a low-pressure turbine side shaft generator driven by a low-pressure turbine is provided. Further, the low pressure turbine side shaft generator and the high pressure turbine side shaft generator are electrically connected. Thus, electricity generated in the high-pressure turbine side shaft generator during partial load operation of the propulsion steam turbine can be supplied to the low-pressure turbine side shaft generator, and the low-pressure turbine can be energized. Therefore, it is possible to balance the outputs of the low pressure turbine and the high pressure turbine. Therefore, it is possible to prevent the contact between the gears of the speed reducer and improve the reliability of the speed reducer.
The high pressure turbine side shaft generator and the low pressure turbine side shaft generator operate as a generator when supplied with electric power when driven, and operate as an electric motor (motor) when supplied with electric power. .

  Furthermore, according to the ship which concerns on this invention, the propulsion apparatus in any one of said is provided.

By connecting the high pressure turbine side shaft generator to the high pressure turbine, the high pressure turbine side shaft generator can be reduced in size. For this reason, the degree of freedom of arrangement in the ship is increased, and the installation cost of the high-pressure turbine side shaft generator can be suppressed. Therefore, the construction cost of the ship can be suppressed.
In addition, when the low-pressure turbine side shaft generator and the high-pressure turbine side shaft generator are provided, it is possible to balance the outputs between the low-pressure turbine and the high-pressure turbine. Therefore, the reliability of the speed reducer can be improved and the failure of the propulsion device can be reduced. Therefore, the reliability with respect to navigation of a ship increases.

  The high pressure turbine side shaft generator was connected to the high pressure turbine. Thereby, the rotation speed can be increased and the high-pressure turbine side shaft generator can be driven. Therefore, the size of the high-pressure turbine side shaft generator can be reduced. Therefore, the space for installing the high-pressure turbine side shaft generator can be reduced, and the installation cost of the high-pressure turbine side shaft generator can be reduced.

It is a schematic structure figure of a ship provided with the propulsion device concerning a 1st embodiment of the present invention. It is a schematic block diagram of the ship provided with the propulsion apparatus which concerns on 2nd Embodiment of this invention.

[First Embodiment]
FIG. 1 shows a schematic configuration diagram of a ship provided with a propulsion device according to a first embodiment of the present invention.
The ship which concerns on this embodiment is a steam turbine ship, and is provided with the propulsion apparatus 1 in the engine room (not shown) under the deck.
The propulsion device 1 includes a propulsion steam turbine 2, a stern reduction gear (reduction gear) 9, a propulsion shaft 15, and a high-pressure turbine side shaft generator 21.

The propulsion steam turbine 2 is a reheat turbine, and includes a forward low pressure turbine (low pressure turbine) 3, a forward high pressure turbine (high pressure turbine) 4, a forward intermediate pressure turbine 5, and a reverse turbine 6. ing.
The forward low pressure turbine 3, the forward high pressure turbine 4, the forward intermediate pressure turbine 5, and the reverse turbine 6 constitute one main engine. The forward low-pressure turbine 3 and the reverse turbine 6 are connected via a single low-pressure turbine shaft 7. The forward high pressure turbine 4 and the forward intermediate pressure turbine 5 are connected via a single high pressure turbine side shaft 8.

  The stern speed reducer 9 includes a high pressure turbine side first speed reducer 10, a low pressure turbine side first speed reducer 11, and a second speed reducer 12. The high-pressure turbine side first speed reducer 10, the low-pressure turbine side first speed reducer 11, and the second speed reducer 12 are provided on the stern side of the propulsion steam turbine 2.

  A high pressure turbine side shaft 8 provided in the forward intermediate pressure turbine 5 is connected to the high pressure turbine side first reduction gear 10. The low pressure turbine side first reduction gear 11 is connected to a low pressure turbine side shaft 7 provided in the forward low pressure turbine 3. A second speed reducer 12 is connected to the other ends of the high pressure turbine side first speed reducer 10 and the low pressure turbine side first speed reducer 11.

  The propulsion shaft 15 includes an intermediate shaft 16, a propeller shaft 17, and a coupling 18. The intermediate shaft 16 is connected to the second speed reducer 12. Further, a propeller shaft 17 is connected to the other end of the intermediate shaft 16 via a coupling 18.

A high pressure turbine side shaft generator 21 is connected to the bow of the forward high pressure turbine 4 via a bow high pressure turbine side reduction gear 20 provided on the high pressure turbine side shaft 8.
The high-pressure turbine side shaft generator 21 operates as a generator when supplying electric power, and operates as an electric motor (motor) when supplied with electric power.

Next, the operation method of the propulsion device and the high-pressure turbine side shaft generator during rated load operation of the propulsion steam turbine will be described.
Main steam generated in a main boiler (not shown) is supplied to the forward high-pressure turbine 4. The main steam that has flowed into the forward high-pressure turbine 4 acts on turbine blades (not shown) to rotate and drive the high-pressure turbine side shaft 8 connected to the forward high-pressure turbine 4.

The steam that has passed through the forward high-pressure turbine 4 is guided to a reheater (not shown). The steam led to the reheater is reheated and heated to the saturation temperature or higher to be superheated steam. The superheated steam is supplied to the forward intermediate pressure turbine 5. The superheated steam supplied to the forward intermediate pressure turbine 5 acts on turbine blades (not shown) to further rotationally drive the high pressure turbine side shaft 8 connected to the forward high pressure turbine 5.
The rotational speed of the high-pressure turbine side shaft 8 that is rotationally driven by the forward high pressure turbine 4 and the forward intermediate pressure turbine 5 is, for example, 6000 rpm.

The steam that has passed through the forward intermediate pressure turbine 5 is guided to the forward low pressure turbine 3. The steam guided to the forward low-pressure turbine 3 acts on turbine blades (not shown) to rotationally drive the low-pressure turbine side shaft 7 connected to the forward low-pressure turbine 3.
The rotational speed of the low-pressure turbine side shaft 7 that is rotationally driven by the forward-traveling low-pressure turbine 3 is, for example, 3000 rpm.

  The rotational speed of the high-pressure turbine side shaft 8 that is rotationally driven by the forward high pressure turbine 4 and the forward intermediate pressure turbine 5 is decelerated by the high pressure turbine side first speed reducer 10. The rotational speed of the low-pressure turbine side shaft 7 connected to the forward-traveling low-pressure turbine 3 is decelerated by the low-pressure turbine side first reduction gear 11.

  The outputs of the high-pressure turbine side shaft 8 and the low-pressure turbine side shaft 7 transmitted to the high-pressure turbine side first speed reducer 10 and the low-pressure turbine side first speed reducer 11 are transmitted to the second speed reducer 12. The second speed reducer 12 combines the rotational speed and output of the high pressure turbine side first speed reducer 10 and the low pressure turbine side first speed reducer 11 into one rotational speed and one output. The single rotation speed is further decelerated in the second reduction gear 12 and becomes, for example, 80 rpm.

  The output combined into one by the stern reducer 9 is transmitted to the intermediate shaft 16. The output transmitted to the intermediate shaft 16 is transmitted to the propeller shaft 17 via the coupling 18. When the output is transmitted from the intermediate shaft 16 to the propeller shaft 17, the propeller 19 is rotationally driven to generate thrust. This will propel the ship.

  The high pressure turbine side shaft 8 is rotationally driven by the forward high pressure turbine 4 and the forward intermediate pressure turbine 5, whereby the bow high pressure turbine side reduction gear 20 is driven. By driving the high pressure turbine side reduction gear 20 for the bow, the rotational speed of the high pressure turbine side shaft 8 is decelerated and transmitted to the high pressure turbine side shaft generator 21. As a result, the high-pressure turbine-side shaft generator 21 connected to the bow high-pressure turbine-side reduction gear 20 is driven, for example, at a rotational speed of 1800 rpm. The high-pressure turbine side shaft generator 21 operates as a generator that generates electric power when the bow high-pressure turbine side reduction gear 20 is rotationally driven.

  Electric power generated by the high-pressure turbine side shaft generator 21 and a generator (not shown) provided in the engine room is monitored, controlled, and protected by a power management system (PMS) not shown. ing. Therefore, the electric power generated in the high-pressure turbine-side shaft generator 21 is distributed to in-board electric power such as drive power for in-vehicle devices (not shown) installed in the engine room and in-board lighting by the electric power control system.

As described above, according to the propulsion device according to the present embodiment and a ship equipped with the same, the following operational effects can be obtained.
The high pressure turbine side shaft generator 21 is connected to the forward high pressure turbine (high pressure turbine) 4 through the bow high pressure turbine side reduction gear 20. Thereby, compared with the case where the high pressure turbine side shaft generator 21 is connected to the propulsion shaft 15, the high speed turbine side shaft generator 21 can be driven at a higher rotational speed. Therefore, the size of the high-pressure turbine side shaft generator 21 can be reduced. Therefore, the space for installing the high-pressure turbine side shaft generator 21 can be reduced, and the installation cost of the high-pressure turbine side shaft generator 21 can be reduced.

  Moreover, the high pressure turbine side shaft generator 21 can be reduced in size. For this reason, the degree of freedom of arrangement in the ship is increased, and the installation cost of the high-pressure turbine side shaft generator 21 can be suppressed. Therefore, the construction cost of the ship can be suppressed.

[Second Embodiment]
Hereinafter, a second embodiment of the present invention will be described. The structure of the propulsion device of the present embodiment, the propulsion device, and a ship equipped with the propulsion device are different from those of the first embodiment in that a low-pressure turbine side shaft generator is provided on the bow side of the low-pressure turbine. It is. Therefore, about the same structure and driving | operation method, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

FIG. 2 shows a schematic configuration diagram of a ship including a propulsion device according to the second embodiment of the present invention.
A low pressure turbine side shaft generator 23 is connected to the bow side of the forward low pressure turbine 3 through a low pressure turbine side reduction gear 22 for bow provided on the low pressure turbine side shaft 7.
The low-pressure turbine side shaft generator 23 operates as a generator when supplying electric power, and operates as an electric motor (motor) when supplied with electric power. The high-pressure turbine side shaft generator 21 and the low-pressure turbine side shaft generator 23 are electrically connected by a power control system 24.

  The power control system 24 is provided in an engine control room (not shown). The power control system 24 monitors, controls, and protects the power generated by the high pressure turbine side shaft generator 21, the low pressure turbine side shaft generator 23, and a generator (not shown) provided in the engine room. ing. The electric power control system 24 distributes electric power to inboard electric power such as a driving power source for an auxiliary machine (not shown) installed in the engine room and inboard lighting.

Next, an operation method of the low-pressure turbine side shaft generator during rated load operation of the propulsion steam turbine will be described.
The low-pressure turbine-side shaft 7 connected to the forward-traveling low-pressure turbine 3 is rotationally driven to drive the bow low-pressure turbine-side reduction gear 22. By driving the low pressure turbine side reduction gear 22 for the bow, the rotational speed of the low pressure turbine side shaft 7 is decelerated and transmitted to the low pressure turbine side shaft generator 23. As a result, the low-pressure turbine-side shaft generator 23 connected to the bow low-pressure turbine-side reduction gear 22 is driven, for example, at a rotational speed of 1800 rpm. The low-pressure turbine-side shaft generator 23 operates as a generator that generates electric power when the bow low-pressure turbine-side reduction gear 22 is driven.

  The electric power generated by the high-pressure turbine side shaft generator 21, the low-pressure turbine side shaft generator 23, and the generator provided in the engine room is used as a drive power source for auxiliary equipment installed in the engine room by the power control system 24. Power can be distributed to ship power such as lighting and inboard lighting.

Next, the operation method of the propulsion device, the high pressure turbine side shaft generator and the low pressure turbine side shaft generator during partial load operation of the propulsion steam turbine will be described.
During partial load operation of the propulsion steam turbine 2, the amount of steam supplied to the propulsion steam turbine 2 decreases.

  In the propulsion steam turbine 2, the forward high pressure turbine 4 and the forward intermediate pressure turbine 5 are rotationally driven by the supplied steam. The high pressure turbine side shaft 8 is rotationally driven by rotationally driving the forward high pressure turbine 4 and the forward intermediate pressure turbine 5. Since the propulsion steam turbine 2 is supplied with a reduced amount of steam as compared with the rated load operation, the rotation speed of the high-pressure turbine side shaft 8 is the rotation speed during the rated load operation of the propulsion steam turbine 2, for example, It becomes lower than 6000 rpm.

The steam that has passed through the forward high pressure turbine 4 and the forward intermediate pressure turbine 5 is supplied to the forward low pressure turbine 3. The amount of steam supplied to the propulsion steam turbine 2 as a whole, and the forward high pressure turbine 4 and the forward intermediate pressure turbine 5 are rotationally driven, thereby reducing the energy of the steam guided to the forward low pressure turbine 3. To do. Since the energy of the steam supplied to the forward low-pressure turbine 3 decreases, the output of the forward low-pressure turbine 3 decreases.
Therefore, the rotational speed of the low-pressure turbine side shaft 7 is significantly lower than the rotational speed at the rated load operation of the propulsion steam turbine 2, for example, 3000 rpm.

  The output of the high pressure turbine side shaft 8 that is rotationally driven by the forward high pressure turbine 4 and the forward intermediate pressure turbine 5 is transmitted to the high pressure turbine side first speed reducer 10. The output of the low-pressure turbine side shaft 7 connected to the forward low-pressure turbine 3 is transmitted to the low-pressure turbine side first speed reducer 11.

  The outputs of the high-pressure turbine side shaft 8 and the low-pressure turbine side shaft 7 transmitted to the high-pressure turbine side first speed reducer 10 and the low-pressure turbine side first speed reducer 11 are transmitted to the second speed reducer 12. The second speed reducer 12 combines the rotational speed and output of the high pressure turbine side first speed reducer 10 and the low pressure turbine side first speed reducer 11 to be transmitted to the propulsion shaft 15 as one rotational speed and one output. Is done.

  The output transmitted to the propulsion shaft 15 is lower than that during rated load operation of the propulsion steam turbine 2 because the outputs of the low-pressure turbine side shaft 7 and the high-pressure turbine side shaft 8 are reduced. Therefore, the rotational driving force transmitted from the propulsion shaft 15 to the propeller 19 is also reduced. Since the rotational driving force of the propeller 19 decreases, the thrust decreases and the speed of the ship decreases.

  The high pressure turbine side shaft 8 is rotationally driven by the forward high pressure turbine 4 and the forward intermediate pressure turbine 5, whereby the bow high pressure turbine side reduction gear 20 is driven. Compared with the rated load operation of the propulsion steam turbine 2, the reduced output is transmitted from the high-pressure turbine side shaft 8 to the high-pressure turbine side shaft generator 21 through the bow high-pressure turbine side reduction gear 20. The high-pressure turbine-side shaft generator 21 is driven by the output transmitted by the high-pressure turbine-side reduction gear 20 for the bow. Thereby, the high-pressure turbine side shaft generator 21 generates electric power.

  The low pressure turbine side shaft 7 is rotationally driven by the forward low pressure turbine 3 to drive the bow low pressure turbine side reduction gear 22. At the time of partial load operation of the propulsion steam turbine 2, the output of the low pressure turbine side shaft 7 connected to the forward low pressure turbine 3 decreases, so the low pressure turbine side generator for the bow is connected via the low pressure turbine side reduction gear 22 for the bow. The output transmitted to 23 also decreases. Therefore, the amount of electric power generated by the bow low-pressure turbine-side generator 23 is reduced.

  During partial load operation of the propulsion steam turbine 2, the output transmitted from the low pressure turbine side shaft 7 to the second speed reducer 12 via the low pressure turbine first speed reducer 11 and the high pressure turbine side shaft 8 is the first high speed turbine first speed reduction. The difference from the output transmitted to the second speed reducer 12 via the machine 10 increases. Therefore, an imbalance is generated in the output transmitted from each of the low pressure turbine first speed reducer 11 and the high pressure turbine first speed reducer 10 in the second speed reducer 12. When an imbalance occurs in the output transmitted to the second speed reducer 12, the gears (not shown) of the second speed reducer 12 may collide with each other.

Therefore, the pressure of steam supplied to the forward low-pressure turbine 3 during rated load operation of the propulsion steam turbine 2 and the pressure of steam supplied to the forward low-pressure turbine 3 during partial load operation of the propulsion steam turbine 2. (Hereinafter referred to as “differential pressure”) and the output generated by the forward low-pressure turbine 3 during partial load operation is calculated based on this differential pressure. When the output of the forward low-pressure turbine 3 calculated from the differential pressure becomes equal to or lower than a predetermined output, the power control system 24 converts a part of the power generated in the bow high-pressure turbine side generator 21 to the bow low-pressure. Control is performed so as to supply to the turbine-side generator 23.
The bow low-pressure turbine-side generator 23 supplied with electric power by the electric power control system 24 is energized and operates as an electric motor (motor).

  Since the bow low pressure turbine side generator 23 is energized, the low pressure turbine side shaft 7 is energized via the bow low pressure turbine side reduction gear 22 connected to the bow low pressure turbine side generator 23. Since the low pressure turbine side shaft 7 is energized, the forward low pressure turbine 3 is energized. Further, since the low-pressure turbine side shaft 7 is energized, the low-pressure turbine first speed reducer 11 connected to the low-pressure turbine side shaft 7 is energized. When the low-pressure turbine first speed reducer 11 is energized, the output transmitted from the low-pressure turbine first speed reducer 11 to the second speed reducer 12 increases. As a result, there is an imbalance between the output transmitted from the low pressure turbine first speed reducer 11 to the second speed reducer 12 and the output transmitted to the second speed reducer 12 via the high pressure turbine first speed reducer 10. It will be resolved.

As described above, according to the propulsion device according to the present embodiment and a ship equipped with the same, the following operational effects can be obtained.
The low pressure turbine side shaft generator 23 driven by the forward low pressure turbine (low pressure turbine) 3 is provided. The low pressure turbine side shaft generator 23 and the high pressure turbine side shaft generator 21 are electrically connected. Thereby, at the time of partial load operation of the propulsion steam turbine 2, the electricity generated in the high pressure turbine side shaft generator 21 can be supplied to the low pressure turbine side shaft generator 23, and the forward low pressure turbine 3 can be energized. Therefore, it is possible to balance the output between the forward low pressure turbine 3 and the forward high pressure turbine (high pressure turbine) 4. Accordingly, it is possible to prevent the stern reduction gears (reduction gears) 9 from being hit by the gears and to improve the reliability of the stern reduction gears 9.

  Further, when the low-pressure turbine side shaft generator 23 and the high-pressure turbine side shaft generator 21 are provided, it is possible to balance the output between the forward low-pressure turbine 3 and the forward high-pressure turbine 4 and for the stern. The reliability of the speed reducer 9 is improved. Therefore, the failure of the propulsion device 1 can be reduced. Therefore, the reliability with respect to navigation of a ship increases.

2 Propulsion steam turbine 3 Advance low pressure turbine (low pressure turbine)
4 Advance high-pressure turbine (high-pressure turbine)
9 Reducer (stern reducer)
15 Propulsion shaft 16 Propeller
21 High-pressure turbine side shaft generator

Claims (3)

A propulsion steam turbine comprising: a high pressure turbine; and a low pressure turbine connected in parallel to the high pressure turbine;
A high-pressure turbine side shaft generator connected to the high-pressure turbine;
A speed reducer connecting the high pressure turbine and the low pressure turbine;
A propulsion shaft connected to the speed reducer;
A propulsion device provided on the propulsion shaft.   The propulsion device according to claim 1, wherein a low-pressure turbine side shaft generator is connected to the low-pressure turbine, and the high-pressure turbine side shaft generator and the low-pressure turbine side shaft generator are electrically connected.   A ship provided with the propulsion device according to claim 1.

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