JPS6365803B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Industrial Application Field The present invention relates to a power plant having a gas turbine combined cycle marine propulsion plant.

(b) Prior art A marine propulsion power system has been proposed in which a vessel with two propellers is equipped with a gas turbine combined cycle marine propulsion plant that combines a gas turbine, an exhaust gas boiler that uses its exhaust heat, and a steam turbine. has been done. As shown in Fig. 1, a gas turbine combined cycle marine propulsion plant 2, 3 is mounted on a ship 1, and port and starboard propellers 4, 5 are connected via reducers 6, 7 and propeller shafts 8, 9. , are driven by the outputs of the gas turbine 10 and the steam turbine 12, and the outputs of the gas turbine 11 and the steam turbine 13. That is, these gas turbines 10, 11
is equipped with an exhaust gas boiler 14, 1 that utilizes the exhaust heat.
5 are installed, respectively, and the exhaust gas boilers 14, 15
The steam generated is sent to steam turbines 12 and 13, and the total output of gas turbine 10 and steam turbine 12 and the total output of gas turbine 11 and steam turbine 13 drive propeller shafts 8 and 9 independently. By the way, when a gas turbine operates at low output, its thermal efficiency (fuel consumption rate) deteriorates rapidly compared to when it operates at high output, and this trend is the same for gas turbine combined cycle marine propulsion plants. As shown in Figure 2, the relationship between the output (%) and fuel consumption rate (g/HP・h) of one gas turbine combined cycle marine propulsion plant is, for example, the fuel consumption at point A of 100% output. The rate is about 150g/HP・h at the lowest, and about 200g/HP・h at point B, which is 50% output. That is, in the above example, when the ship is traveling at maximum speed, the two gas turbine combined cycle marine propulsion plants are each operated at 100% output, and the output is 2 (plants) x 150 (g/HP h) x P ( HP)
= 300P (g/h) fuel consumption, but when sailing at low speed, each marine propulsion plant must drive two propellers at, say, 50% output, so 2 (units) x 200 (g/HP・h)×
The fuel consumption is P/2 (HP) = 200 (g/h).

In this way, two gas turbine combined cycle marine propulsion plants driving one propeller can be used.
The conventional power unit has the disadvantage that when the ship is traveling at low speed, two gas turbine combined cycle marine propulsion plants must be operated at low fuel consumption rates to propel the ship.

(c) Purpose of the Invention The purpose of the present invention is to solve the problem of extremely low thermal efficiency when a ship is propelled at low speed using the two gas turbine combined cycle marine propulsion plants proposed above. An object of the present invention is to provide a power unit having a gas turbine combined cycle marine propulsion plant that can be operated with good thermal efficiency even when the vessel is traveling at low speed.

(d) Structure of the Invention The present invention is characterized by at least a gas turbine combined cycle marine propulsion plant, which is a combination of a gas turbine, an exhaust gas boiler that utilizes the exhaust heat of the gas turbine, and a steam turbine, installed in a ship having two propellers. The gas turbine of this gas turbine combined cycle marine propulsion plant and the other gas turbines each drive the propeller through a reduction gear, and the exhaust gas of the gas turbine of the gas turbine combined cycle marine propulsion plant is sent to the exhaust gas boiler. In addition, the present invention is characterized by: The gas turbine of the gas turbine combined cycle marine propulsion plant and another gas turbine each drive a propeller through a reduction gear, and the exhaust gas of the gas turbine of the gas turbine combined cycle marine propulsion plant is introduced into an exhaust gas boiler, and the other gas turbine A power source having a gas turbine combined cycle marine propulsion plant capable of operating the steam turbine that drives the speed reducer of the combined cycle marine propulsion plant and driving a generator via the gas turbine speed reducer of the combined cycle marine propulsion plant. This is because it is a device.

(e) Examples Hereinafter, the present invention will be explained in detail based on examples thereof.

FIG. 3 is an overall system diagram of a power plant 18 having a gas turbine combined cycle marine propulsion plant according to an embodiment of the present invention. Two turbine combined cycle marine propulsion plants 20 and 21 are installed, and each gas turbine 22 and 23 is equipped with an exhaust gas boiler 2.
4 and 25 are provided. Each exhaust gas boiler has heat transfer tubes 26 and 27 through which the gas turbines 22 and 23 exchange heat with the combustion exhaust gas, and the steam obtained from each heat transfer tube is transferred to the other gas turbine combined cycle marine propulsion plant 2.
The steam is supplied via steam supply pipes 32 and 33 to steam turbines 31 and 30 provided in reduction gears 29 and 28 driven by gas turbines 23 and 22 of No. 1 and 20, respectively. From each steam turbine 30, 31 are condensers 34, 35, condensate pipes 36, 37, water pumps 38, 39, water supply pipe 4.
1 and 40, to the exhaust gas boilers 25 and 24 of the original gas turbine combined cycle marine propulsion plants 21 and 20.
Therefore, the port propeller 4 is operated by the power generated by the output turbine of the gas turbine 22 of the gas turbine combined cycle marine propulsion plant 20 and the steam from the exhaust gas boiler 25 of the gas turbine combined cycle marine propulsion plant 21. The power generated by the steam turbine 30 is also driven through the reduction gear 28 .
Similarly, the starboard propeller 5 is operated by the steam turbine 3 which is operated by the power generated by the output turbine of the gas turbine 23 and the steam from the exhaust gas boiler 24.
1 is also driven via a speed reducer 29.

According to this embodiment of the configuration, when the two gas turbine combined cycle marine propulsion plants 20 and 21 are each operated at 100% output, that is, when the vessel is traveling at maximum speed, both propellers 4 , 5 corresponds to the output of each gas turbine 22, 23 and the other exhaust gas boiler 2.
It is driven by steam power of 5.24 mm with a fuel consumption of 300 P (g/h) similar to that described in the conventional example. On the other hand, when navigating at a low speed, the operation of one gas turbine combined cycle marine propulsion plant 21 is stopped, and only the other marine propulsion plant 20 is operated at a position with 100% output and a good fuel consumption rate. Therefore, the port propeller 4 will be driven by the output of the gas turbine 22, and the starboard propeller 5 will be driven by the steam power from the exhaust gas boiler 24, and the fuel consumption will be 1 (unit) x 150
The fuel consumption is (g/HP・h)×P(HP)=150P(g/h). As a result, the 2 (base) mentioned in the conventional example
×200(g/HP・h)×P/2(HP)=200P(g/
Compared to h) fuel consumption, 25% fuel consumption can be saved. However, the output of the steam turbine 31 obtained from the exhaust heat of the gas turbine 22 is smaller than the output of the gas turbine 22, and since the port and starboard propeller outputs are not equal, a counter-rudder is required and the thrust efficiency is reduced. However, even taking this into account, fuel consumption can be improved by approximately 15%. It goes without saying that the same effect can be obtained even if the operation of the gas turbine combined cycle marine propulsion plant 20 is stopped and only the other marine propulsion plant 21 is operated at a place where the output is 100% and the fuel consumption rate is good.

FIG. 4 is a system diagram of a power plant 43 according to a different embodiment, in which one gas turbine combined cycle marine propulsion plant 20 is used instead of the two gas turbine combined cycle marine propulsion plants described above.
and a gas turbine 44, the propeller 4 is driven only by the gas turbine 22 via a reducer 28, and the propeller 5 is a steam turbine operated by the gas turbine 44 and steam from the exhaust gas boiler 24 of the gas turbine combined cycle marine propulsion plant 20. It is designed to be driven by 31.

Even in an embodiment with such a configuration, when the ship is navigating at low speed, the operation of the gas turbine 44 is stopped and only the plant 20 is operated in a place with a good fuel consumption rate of 100% output, so that the port propeller 4 is the output of the gas turbine 22, and the starboard propeller 5 is driven by the steam turbine 31 from the exhaust gas boiler 24, so the fuel consumption is
150P (g/h), and the same improvement in fuel consumption as in the above embodiment is achieved.

FIG. 5 is an overall system diagram of an embodiment which is a power device 46 of a different invention, and the difference from the first embodiment of the invention described above is that electricity is generated via the power take-off shafts 47 and 48 in the reduction gears 28 and 29. The reason is that machines 49 and 50 were installed. These generators are capable of utilizing a portion of the output of the gas turbine 22 and the steam turbine 30 or the output of the gas turbine 23 and the steam turbine 31 for onboard power needs.

According to this embodiment of the configuration, when the ship is traveling at low speed, the operation of one gas turbine combined cycle marine propulsion plant 21 is stopped, and only the other plant 20 is operated at a fuel consumption rate of 100% output. Operate it in a suitable place. Therefore, the port propeller 4 is driven by the output of the gas turbine 22, and the starboard propeller 5 is driven by the steam turbine power from the exhaust gas boiler 24.
Fuel consumption will be 150P (g/h). the result,
Compared to the fuel consumption of 200P (g/h) described in the conventional example, fuel consumption can be reduced by 25%. At this time, the output of the output turbine of the gas turbine 22 is larger than the steam power obtained by the exhaust gas boiler 24, but since a part of the power for driving the propeller 4 is taken out by the generator 49 for onboard power, the propeller 4 . In addition, the operation of the gas turbine combined cycle marine propulsion plant 20 will be stopped, and the operation of the other plants 2 will be stopped.
It goes without saying that the same result can be obtained even if only 1 is operated at a place with 100% output and a good fuel consumption rate.

FIG. 6 is an overall system diagram of a power plant 52 according to a different embodiment, in which a generator 49 is provided in the reducer 28 in the second embodiment of the invention described above.

Even in such an embodiment, when the ship is navigating at low speed, the operation of the gas turbine 44 is stopped and only the marine propulsion plant 20 is operated at a high efficiency with 100% output, so that the port propeller 4 is With the output of the gas turbine 22, the starboard propeller 5 is driven by the steam turbine 31, and the fuel consumption is 150P (g/h), which is approximately 25
% improvement in fuel consumption is obtained.

(f) Effect of the Invention As detailed above, the present invention provides a gas turbine combined cycle marine propulsion plant that combines a gas turbine, an exhaust gas boiler that utilizes the exhaust heat of the gas turbine, and a steam turbine for a ship having two propellers. At least one gas turbine is installed, and the gas turbine of this gas turbine combined cycle marine propulsion plant and another gas turbine drive the propeller through their respective reduction gears, and the exhaust gas of the gas turbine of the gas turbine combined cycle marine propulsion plant is transferred to the exhaust gas. Since the power plant has a gas turbine combined cycle marine propulsion plant that can be introduced into the boiler and operate the steam turbine that drives the other propeller, when the ship is sailing at low speed, the gas turbine combined cycle One cycle marine propulsion plant can be operated at 100% output with good fuel consumption, making it possible to reduce fuel consumption by approximately 15%.

In addition, a different invention provides that at least one gas turbine of the gas turbine combined cycle marine propulsion plant and the other gas turbine drive a propeller through respective reduction gears, and the gas turbine of the gas turbine combined cycle marine propulsion plant A gas turbine combined cycle marine propulsion plant in which exhaust gas is introduced into an exhaust gas boiler to operate the steam turbine that drives the other propeller, and a generator is provided in the reducer of the gas turbine of the gas turbine combined cycle marine propulsion plant. Since the power plant has a gas turbine combined cycle marine propulsion plant 1 when the ship is navigating at low speed,
The engine can be operated efficiently at 100% output, allowing the ship to sail efficiently in a straight line without the need for a rudder.

[Brief explanation of drawings]

Figure 1 is a system diagram of a power plant with a conventional gas turbine combined cycle marine propulsion plant, Figure 2 is a graph showing the relationship between the output and fuel consumption rate of a gas turbine combined cycle marine propulsion plant, and Figure 3 is the main A system diagram of a power plant having a gas turbine combined cycle marine propulsion plant of the invention, FIG. 4 is a system diagram of a different embodiment,
FIG. 5 shows a system diagram of a power plant having a gas turbine combined cycle marine propulsion plant according to a different invention, and FIG. 6 shows a system diagram of a different embodiment. 1... Ship, 4, 5... Propeller, 8, 9...
Propeller shaft, 18, 43, 46, 52... Power unit, 20, 21... Gas turbine combined cycle marine propulsion plant, 22, 23, 44...
Gas turbine, 24, 25...Exhaust gas boiler, 2
8, 29...Reducer, 30, 31...Steam turbine.

Claims (1)

[Scope of Claims] 1. A ship having two propellers is equipped with at least one gas turbine combined cycle marine propulsion plant that combines a gas turbine, an exhaust gas boiler that utilizes its exhaust heat, and a steam turbine,
The gas turbine of this gas turbine combined cycle marine propulsion plant and another gas turbine drive the propeller through their respective reducers, and the exhaust gas of the gas turbine of the gas turbine combined cycle marine propulsion plant is introduced into the exhaust gas boiler, A power plant having a gas turbine combined cycle marine propulsion plant, characterized in that the steam turbine that drives the propeller of the gas turbine can be operated. 2. A ship having two propellers is equipped with at least one gas turbine combined cycle marine propulsion plant that combines a gas turbine, an exhaust gas boiler that uses its exhaust heat, and a steam turbine,
The gas turbine of this gas turbine combined cycle marine propulsion plant and another gas turbine each drive a propeller via a reduction gear, and the exhaust gas of the gas turbine of the gas turbine combined cycle marine propulsion plant is introduced into an exhaust gas boiler, and the other gas turbine drives a propeller through a reduction gear. Gas turbine combined cycle marine propulsion, characterized in that the steam turbine that drives the reducer is operated, and a generator can be driven via the reducer of the gas turbine of the combined cycle marine propulsion plant. A power plant with a plant.