JP5588146B2 - Marine steam turbine equipment - Google Patents

Description

  The present invention relates to a steam turbine facility mounted on a ship provided with a plurality of propellers.

  In the LNG carrier, which is a LNG carrier, the storage tank is insulated in order to keep the LNG, which is the cargo, at a very low temperature. The part will spontaneously evaporate. Therefore, in a conventional LNG ship, a steam turbine that can easily use the evaporated gas (boil-off gas: BOG) as a fuel has been adopted as a main engine (see, for example, Patent Document 1).

JP 2006-349084 A

  By the way, in recent years, the load capacity of LNG ships has been increasing in order to respond to the increase in LNG demand, and it is said that LNG ships will continue to increase in size in order to increase transport efficiency. As ship size increases, two ship propulsion systems are provided. Then, in an LNG ship using a steam turbine as a main engine, it is necessary to mount two sets of steam turbine equipment including a water supply system, so that an engine room becomes large and maintenance becomes complicated. Because of this situation, LNG ships in recent years often use diesel cycle DFDE (Dual Fuel Diesel Electric) ships or DRL (low speed Diesel + Re-Liquefaction) ships instead of steam turbine ships. Is the current situation.

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to save space in an engine room and improve maintainability in a ship using a steam turbine as a main engine.

This invention is made | formed in view of the said situation, The steam turbine equipment for ships which concerns on this invention is a steam turbine equipment mounted in the ship provided with several propulsion propellers, Comprising: Several steam generating steam A steam, a plurality of steam turbine devices that are operated by steam from the plurality of boilers and individually drive the pair of left and right propulsion propellers, and the steam discharged from the plurality of steam turbine devices are aggregated. condenser for condensing Te, and has a plurality of water supply devices connected in series with each other consists of water pressure reheater or deaerator connected to said condenser, directing water to the plurality of boiler feed water A water supply system is provided for one of the plurality of steam turbine devices, and the steam turbine device is connected to a steam inlet connected to the plurality of boilers and the water supply system. An air outlet and a plurality of bleed ports provided at intervals in the flow direction between the steam inlet and the steam outlet, and the bleed port on the upstream side of the plurality of bleed ports, It is connected to a downstream water supply device among the plurality of water supply devices, and a downstream extraction port of the plurality of extraction ports is connected to an upstream water supply device among the plurality of water supply devices, To do.

  According to the said structure, since the several steam turbine apparatus respectively corresponding to several propulsion propellers shares one water supply system, it is not necessary to provide several water supply systems according to the number of propulsion propellers. Therefore, the entire steam turbine facility is compact, space saving of the engine room of the ship is achieved, and maintainability of the steam turbine facility is improved. Then, the low-temperature and low-pressure steam that has done a lot of work in the steam turbine device is extracted from the extraction port on the downstream side, and is supplied to the upstream water supply equipment that is low-temperature and low-pressure, while the high-temperature and high-pressure that has done little work in the steam turbine device The steam is extracted from the upstream bleed port and supplied to the downstream water supply device that is high temperature and pressure. Therefore, there is little energy loss at the time of ensuring the vapor | steam of the appropriate conditions required for each of several water supply apparatus, and the efficiency of a steam turbine installation improves as a whole.

  A branch passage for branching steam led from the upstream bleed port to the downstream water supply device and guiding it to the upstream water supply device, and an opening / closing valve for opening and closing the branch passage may be provided. .

  According to the above configuration, when the operation state of the steam turbine device changes, and when steam is required from other than the downstream bleeder to the upstream water supply device, by opening the on-off valve, It is possible to obtain steam having an appropriate condition required for the upstream water supply device from the steam from the upstream bleed port (that is, steam worked by the steam turbine) through the branch passage. Therefore, compared with the case where the steam from the boiler is depressurized by a throttle or the like and supplied to the upstream water supply device, there is less energy loss, and the efficiency of the steam turbine equipment is improved as a whole.

  A plurality of the bleed ports are provided per one of the water supply devices, and the bleed ports on the upstream side of these bleed ports may be connected to the water supply device via an on-off valve.

  According to the above configuration, even when the condition of the steam from the extraction port changes due to a change in the operating state of the steam turbine device, the appropriate condition required for the water supply device can be obtained by opening the on-off valve. Steam can be obtained from steam from the upstream bleed port (i.e., steam worked on the steam turbine). Steam with the proper conditions required for the water supply equipment can be obtained from the steam working on the steam turbine. Therefore, compared with the case where the steam from the boiler is decompressed by a throttle or the like and supplied to the water supply device, the energy loss is small, and the efficiency of the steam turbine equipment as a whole is improved.

  As is clear from the above description, according to the present invention, the entire steam turbine facility is compact, space saving of the engine room of the ship is achieved, and maintainability of the steam turbine facility is also improved.

1 is a schematic system diagram of a marine steam turbine facility according to a first embodiment of the present invention. It is a schematic system diagram of the steam turbine equipment for ships concerning a 2nd embodiment of the present invention. It is a schematic system diagram of the steam turbine equipment for ships concerning a 3rd embodiment of the present invention. It is a schematic system diagram of the steam turbine equipment for ships concerning a 4th embodiment of the present invention.

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

(First embodiment)
FIG. 1 is a schematic system diagram of a marine steam turbine facility 1 according to a first embodiment of the present invention. As shown in FIG. 1, the steam turbine equipment 1 is mounted on a ship (for example, an LNG ship) provided with a pair of left and right propulsion propellers 2R and 2L. The steam turbine facility 1 includes a plurality of boilers 3 and 4. The boilers 3 and 4 include drums 3a and 4a that generate steam, economizers 3b and 4b that preheat the water guided to the drums 3a and 4a, and superheaters 3c that superheat the steam that has been discharged from the drums 3a and 4a. 4c. For example, the boilers 3 and 4 generate high-pressure steam by using, as fuel, boil-off gas generated in an LNG tank mounted on the ship. The steam generated in the boilers 3 and 4 is guided to the steam inlets of the pair of left and right steam turbine apparatuses 5R and 5L, respectively. Between the boilers 3 and 4 and the steam turbine devices 5R and 5L, operation units 9R and 9L are provided for controlling the flow rates of the steam guided to the steam turbine devices 5R and 5L, respectively.

  The steam turbine devices 5R and 5L according to the present embodiment include high-pressure steam turbines 6R and 6L and low-pressure steam turbines 7R and 7L that are connected in series via the steam passages 17R and 17L. Therefore, the steam generated in the boilers 3 and 4 is guided to the steam inlets 6Ra and 6La of the high-pressure steam turbines 6R and 6L. The high-pressure steam turbines 6R and 6L are respectively operated by steam from the boilers 3 and 4 to generate rotational power. The low-pressure steam turbines 7R and 7L are operated by steam supplied from the steam outlets 6Re and 6Le of the high-pressure steam turbines 6R and 6L to the steam inlets 7Ra and 7La via the steam passages 17R and 17L to generate rotational power. Rotational power generated by the left and right steam turbine apparatuses 5R and 5L is individually transmitted to the propellers 2R and 2L via the speed reducers 8R and 8L.

The used steam discharged from the steam outlets of the steam turbine devices 5R and 5L, that is, the steam outlets 7Rd and 7Ld of the low-pressure steam turbines 7R and 7L, is guided to the water supply system 10. Only one system of the water supply system 10 is provided for the two steam turbine apparatuses 5R and 5L. Water System 10, condenser 11, condensate pump 12, first water supply pressure heat sink 13 (water supply device), a second feed water pressure heat sink 14 (water supply device), a deaerator 15 (water supply device) and the water supply pump 16 and these devices 11 to 16 are connected in series with each other in this order.

The condenser 11 collects used steam discharged from the two steam turbine apparatuses 5R and 5L and condenses them. The condenser 11 is disposed in the center of the hull between the left and right steam turbine apparatuses 5R and 5L. The condensate pump 12 sucks out the water condensed by the condenser 11. First water supply pressure heat sink 13, by utilizing steam, the aspirated water condensate pump 12 to raise the temperature. Second water supply pressure-heater 14, by utilizing the vapor, further raising the temperature of the heating water in the first water supply pressure heat sink 13. Deaerator 15, by utilizing the vapor, to remove oxygen and the like contained in the water from the second water supply pressurized heat 14 in order to prevent corrosion of the boiler 3,4. The feed water pump 16 guides water from the deaerator 15 to the boilers 3 and 4.

  The steam turbine devices 5R and 5L include a plurality of extraction ports (6Rb, 6Rc, 6Rd, 6Lb, 6Lc, and 6Ld) spaced from each other in the flow direction between the steam inlets 6Ra and 6La and the steam outlets 7Rd and 7Ld. , 17Ra, 17La, 7Ra, 7Rb, 7Rc, 7La, 7Lb, 7Lc). Specifically, the high pressure steam turbines 6R and 6L are provided with first extraction ports 6Rb and 6Lb, second extraction ports 6Rc and 6Lc, and third extraction ports 6Rd and 6Ld from upstream to downstream, respectively. . The steam passages 17R and 17L are provided with fourth extraction ports 17Ra and 17La, respectively. The low pressure steam turbines 7R and 7L are provided with fifth extraction ports 7Rb and 7Lb and sixth extraction ports 7Rc and 7Lc from upstream to downstream, respectively.

The steam extracted from the second extraction ports 6Rc and 6Lc is guided to the first reservoir 19 serving as a steam reservoir via the check valves 18R and 18L, respectively, and the steam from the first reservoir 19 is guided to the deaerator 15. It is burned. Fourth extraction port 17Ra, extracted steam in 17La are check valves 20R, respectively, are guided to the second reservoir 21 as a vapor reservoir through 20L, vapor from the second reservoir 21 and the second water supply pressure reheater 14 leads to. Sixth bleed ports 7Rc, the steam extracted by 7Lc, check valves 22R, respectively, is guided to the third reservoir 23 serving as a steam reservoir through 22L, vapors from the third reservoir 23 first water supply pressure reheater 13 leads to.

That is, an upstream side bleed port among these bleed ports (6Rc, 6Lc, 17Ra, 17La, 7Rc, 7Lc) is connected to a downstream side water supply device among the plurality of water supply devices 13-15, and these bleed ports The extraction port on the downstream side of (6Rc, 6Lc, 17Ra, 17La, 7Rc, 7Lc) is connected to the upstream water supply device among the plurality of water supply devices 13-15. Therefore, the high-temperature and high-pressure steam that has done little work in the steam turbine apparatuses 5R and 5L is extracted from the upstream extraction port (for example, the extraction ports 6Rc and 6Lc), and the downstream high-temperature and high-pressure water supply device (for example, While being supplied to the deaerator 15), the low-temperature and low-pressure steam that has done a lot of work in the steam turbine devices 5R and 5L is extracted from the downstream extraction ports (for example, the extraction ports 7Rc and 7Lc), water equipment is upstream (e.g., the first feed water pressure heat sink 13) is supplied to the. As a result, there is little energy loss at the time of ensuring the vapor | steam of the appropriate condition required for each of the some water supply apparatuses 13-15, and the efficiency of the steam turbine equipment 1 improves as a whole.

The reason why it is possible to provide a plurality of extraction ports (6Rc, 6Lc, 17Ra, 17La, 7Rc, 7Lc) in the steam turbine devices 5R, 5L is that the steam turbine equipment 1 is for ships. For example, if air is extracted from a turbine in an onshore cogeneration system or the like, the extracted steam is actively used as another energy source, so the amount of extraction increases and the turbine output greatly fluctuates. It is difficult to increase the number of extraction holes. However, in the case of a ship, since a small bleed amount merely utilizing steam extracted from the steam turbine, such as the water pressure heat sink, the variation of the turbine output is small, it is possible to increase the number of bleed ports It becomes.

  The 1st extraction port 6Rb and 6Lb are also connected to the 1st reservoir | reserver 19 through 1st on-off valve 24R, 24L and non-return valve 25R, 25L. The first on-off valves 24R and 24L are normally closed. When the pressure of the steam from the second extraction ports 6Rc, 6Lc becomes equal to or lower than a predetermined pressure, the first on-off valves 24R, 24L are controlled to open, and the steam from the first extraction ports 6Rb, 6Lb The first reservoir 19 is supplied. That is, a plurality of extraction ports 6Rb, 6Lb, 6Rc, and 6Lc corresponding to the deaerator 15 are provided for each of the steam turbine devices 5R and 5L.

Third bleed ports 6Rd and 6Ld are also connected to the second reservoir 21 via second on-off valves 26R and 26L and check valves 27R and 27L. The second on-off valves 26R and 26L are normally closed in the same manner as the first on-off valves 24R and 24L. When the pressure of the steam from the fourth extraction ports 17Ra, 17La becomes equal to or lower than a predetermined pressure, the second on-off valves 26R, 26L are controlled to open, and the steam from the third extraction ports 6Rd, 6Ld It is supplied to the second reservoir 21. That is, the extraction port corresponding to the second water supply pressure heat sink 14 6Rd, 6Ld, 17Ra, 17La, the steam turbine system 5R, multiply provided per 5L.

Fifth extraction ports 7Rb and 7Lb are also connected to the third reservoir 23 via third on-off valves 28R and 28L and check valves 29R and 29L. The third on-off valves 28R and 28L are normally closed in the same manner as the first on-off valves 24R and 24L and the second on-off valves 26R and 26L. When the pressure of the steam from the sixth extraction ports 7Rc, 7Lc becomes equal to or lower than a predetermined pressure, the third on-off valves 28R, 28L are controlled to open, and the steam from the fifth extraction ports 7Rb, 7Lb It is supplied to the third reservoir 23. That is, the extraction port corresponding to the first water supply pressure heat sink 13 7Rb, 7Lb, 7Rc, 7Lc, the steam turbine system 5R, multiply provided per 5L. The first to third on-off valves 24R, 24L, 26R, 26L, 28R, and 28L may be on / off valves, but may be control valves.

  Therefore, even when the operating conditions of the steam turbine devices 5R, 5L change, and the conditions of the steam from the extraction ports 6Rc, 6Lc, 17Ra, 17La, 7Rc, 7Lc change, the first to third on-off valves 24R , 24L, 26R, 26L, 28R, and 28L can be appropriately opened to obtain steam having appropriate conditions necessary for the water supply apparatuses 13 to 15 from the steam worked by the steam turbine apparatuses 5R and 5L. As a result, the energy loss is reduced compared to the case where the steam from the boilers 3 and 4 is depressurized by a throttle or the like and supplied to the water supply devices 13 to 15, and the efficiency of the steam turbine equipment 1 is improved as a whole.

  Boilers 3 and 4 are also connected to the first reservoir 19 via a fourth on-off valve 30. The fourth on-off valve 30 is normally closed. Even when the first on-off valves 24R and 24L are open, if the steam pressure in the first reservoir 19 is equal to or lower than a predetermined pressure, the fourth on-off valve 30 is controlled to open, and the boilers 3 and 4 Steam is supplied to the first reservoir 19.

  The first reservoir 19 is also connected to the second reservoir 21 via a branch passage 33 provided with a fifth on-off valve 31. The fifth on-off valve 31 is normally closed. Even when the second on-off valves 26R and 26L are open, if the vapor pressure in the second reservoir 21 is equal to or lower than a predetermined pressure, the fifth on-off valve 31 is controlled to open, and the first reservoir 19 Steam is supplied to the second reservoir 21.

  The second reservoir 21 is also connected to the third reservoir 23 via a branch passage 34 provided with a sixth on-off valve 32. The sixth on-off valve 32 is normally closed. Even when the third on-off valves 28R and 28L are open, if the steam pressure in the third reservoir 23 is equal to or lower than a predetermined pressure, the sixth on-off valve 32 is controlled to open, Steam is supplied to the third reservoir 23. In addition, the 4th-6th on-off valves 30-32 are control valves, and can control the opening degree suitably.

  Therefore, when the operation state of the steam turbine devices 5R, 5L changes, or when steam is required for the second reservoir 21 from other than the third extraction ports 6Rd, 6Ld and the fourth extraction ports 17Ra, 17La. By opening the fifth on-off valve 31 as appropriate, steam from the first reservoir 19 adjacent to the upstream side is supplied to the second reservoir 21 via the branch passage 33. Further, when steam is required for the third reservoir 23 from other than the fifth bleed ports 7Rb, 7Lb and the sixth bleed ports 7Rc, 7Lc, the sixth open / close valve 32 is appropriately opened to adjoin the upstream side. The steam from the second reservoir 21 is supplied to the third reservoir 23 via the branch passage 34. As a result, there is little energy loss compared with the case where the steam from the boilers 3 and 4 is depressurized by throttling or the like and supplied to the second reservoir 21 or the third reservoir 23, and the efficiency of the steam turbine equipment 1 is improved as a whole.

According to the configuration described above, only one system of the water supply system 10 is provided for the two steam turbine apparatuses 5R and 5L. Therefore, since the plurality of steam turbine apparatuses 5R and 5L share one water supply system 10, there is no need to provide a plurality of water supply systems according to the number of propellers 2R and 2L. As a result, the entire steam turbine facility 1 becomes compact, space saving of the engine room of the ship is achieved, and maintainability of the steam turbine facility 1 is improved. In the above-described embodiment, (also in the embodiments to be described below), but the water pressure heat sink exemplified those connected two series, which may be provided any number of feed water pressurization reheater is not limited thereto .

(Second Embodiment)
FIG. 2 is a schematic system diagram of a marine steam turbine facility 101 according to the second embodiment of the present invention. As shown in FIG. 2, in the steam turbine equipment 101 of the present embodiment, the configurations of the steam turbine apparatuses 105R and 105L are different from those of the first embodiment. The steam turbine devices 105R and 105L include high-pressure steam turbines 106R and 106L, intermediate-pressure steam turbines 117R and 117L, and low-pressure steam turbines 107R and 107L.

  The steam generated in the boilers 3 and 4 is guided to the steam inlets 106Ra and 106La of the high-pressure steam turbines 106R and 106L. The steam discharged from the steam outlets 106Rd and 106Ld of the high-pressure steam turbines 106R and 106L is reheated by the boilers 3 and 4 and then guided to the steam inlets 117Ra and 117La of the intermediate-pressure steam turbines 117R and 117L. The steam discharged from the steam outlets 117Rd and 117Ld of the medium pressure steam turbines 117R and 117L is guided to the steam inlets 107Ra and 107La of the low pressure steam turbines 107R and 107L. The used steam discharged from the steam outlets of the steam turbine apparatuses 105R and 105L, that is, the steam outlets 107Rd and 107Ld of the low-pressure steam turbines 107R and 107L, is guided to the condenser 11.

  The steam turbine apparatuses 105R and 105L include a plurality of extraction ports (106Rb, 106Rc, 106Lb, 106Lc, 117Rb, 117Rc) provided at intervals in the flow direction between the steam inlets 106Ra, 106La and the steam outlets 107Rd, 107Ld. , 117Lb, 117Lc, 107Rb, 107Rc, 107Lb, 107Lc). Specifically, the high pressure steam turbines 106R and 106L are provided with first extraction ports 106Rb and 106Lb and second extraction ports 106Rc and 106Lc from upstream to downstream, respectively. The intermediate pressure steam turbines 117R and 117L are provided with third extraction ports 117Rb and 117Lb and fourth extraction ports 117Rc and 117Lc, respectively. The low pressure steam turbines 107R and 107L are provided with sixth extraction ports 107Rb and 107Lb and sixth extraction ports 107Rc and 107Lc, respectively, from upstream to downstream. In addition, about the structure which is common in 1st Embodiment, the same code | symbol is attached | subjected and the following description is abbreviate | omitted.

(Third embodiment)
FIG. 3 is a schematic system diagram of a marine steam turbine facility 201 according to the third embodiment of the present invention. As shown in FIG. 3, in the steam turbine equipment 201 of the present embodiment, the configurations of the steam turbine apparatuses 205R and 205L are different from those of the first embodiment. Each of the steam turbine apparatuses 205R and 205L includes one steam turbine 205R and 205L. The steam generated in the boilers 3 and 4 is guided to the steam inlets 205Ra and 205La of the steam turbines 205R and 205L. The used steam discharged from the steam outlets 205Rh and 205Lh of the steam turbines 205R and 205L is guided to the condenser 11.

  The steam turbine apparatuses 205R and 205L have a plurality of extraction ports provided at intervals in the flow direction between the steam inlets 205Ra and 205La and the steam outlets 205Rh and 205Lh. Specifically, in the steam turbines 205R and 205L, from the upstream to the downstream, the first extraction ports 205Rb and 205Lb, the second extraction ports 205Rc and 205Lc, the third extraction ports 205Rd and 205Ld, and the fourth extraction port 205Re, respectively. , 205Le, fifth bleed ports 205Rf, 205Lf and sixth bleed ports 205Rg, 205Lg. In addition, about the structure which is common in 1st Embodiment, the same code | symbol is attached | subjected and the following description is abbreviate | omitted.

(Fourth embodiment)
FIG. 4 is a schematic system diagram of a marine steam turbine facility 301 according to the fourth embodiment of the present invention. As shown in FIG. 4, the steam turbine equipment 301 of this embodiment is different from the first embodiment in that the first to third reservoirs 19, 21, 23 (see FIG. 1) are not provided. That is, the steam extracted from the extraction ports 6Rc, 6Lc, 17Ra, 17La, 7Rc, 7Lc is directly supplied to the water supply devices 13-15. Since other configurations are the same as those of the first embodiment described above, the following description is omitted. Similarly, the configurations of the second and third embodiments may be configured such that the reservoir is eliminated.

  As described above, the marine steam turbine equipment according to the present invention has excellent effects such as compactness of the entire steam turbine equipment, and is widely applied to ships such as LNG ships that can demonstrate the significance of this effect. It is beneficial.

1,101,201,301 steam turbine system 2R, 2L propeller 3,4 boiler 5R, 5L steam turbine apparatus 10 Water System 11 condenser 12 condensate pump 13 first water supply pressure reheater (water device)
14 second water supply pressure reheater (water device)
15 Deaerator (water supply equipment)
16 Water supply pump 24R, 24L 1st on-off valve 26R, 26L 2nd on-off valve 28R, 28L 3rd on-off valve 30 4th on-off valve 31 5th on-off valve 32 6th on-off valve 33, 34 Branch passage

Claims (3)

A steam turbine facility mounted on a ship equipped with a plurality of propellers,
A plurality of boilers generating steam;
A plurality of steam turbine devices that are operated by steam from the plurality of boilers and individually drive the pair of left and right propulsion propellers;
Condenser for condensing by aggregating each of the steam discharged from the plurality of steam turbine apparatus, and, more connected in series to each other consists of the connected water pressure reheater or deaerator to the condenser And a water supply system for guiding water to the plurality of boilers,
The water supply system is provided for one of the plurality of steam turbine devices,
The steam turbine device includes a steam inlet connected to the plurality of boilers, a steam outlet connected to the water supply system, and a plurality of extractions provided at intervals in the flow direction between the steam inlet and the steam outlet. Having a mouth,
An upstream bleed port of the plurality of bleed ports is connected to a downstream water supply device among the plurality of water supply devices,
A steam turbine facility for ships, wherein a bleed port on the downstream side among the plurality of bleed ports is connected to an upstream water supply device among the plurality of water supply devices.   A branch passage for branching steam led from the upstream bleed port to the downstream water supply device and guiding it to the upstream water supply device, and an on-off valve for opening and closing the branch passage. The marine steam turbine equipment according to 1. A plurality of the extraction ports are provided per one of the water supply devices,
3. The steam turbine equipment for a ship according to claim 1, wherein an upstream extraction port among the extraction ports is connected to the water supply device via an on-off valve.

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