JP2018138428A - Marine main turbine controller, marine main turbine facility, and marine main turbine control method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a marine main turbine controller, a marine main turbine facility and a marine main turbine control method carrying out automatic spinning with warming-up effect by reliably rotating a turbine rotor.SOLUTION: A marine main turbine controller 100 carrying out control of a marine main turbine 2 provided with an advancing steering valve 42 and a backing steering valve 44 carries out control to alternately switch opening and closing of the advancing steering valve 42 and the backing steering valve 44 by: opening the advancing steering valve 42 when the marine main turbine 2 stops; fully closing the advancing steering valve 42 when spindle speed of a the marine main turbine 2 reaches a first threshold while the advance steering valve 42 is open and simultaneously opening the backing steering valve 44; and fully closing the backing steering valve 44 when the spindle speed of the marine main turbine 2 while the backing steering valve 44 is open and simultaneously opening the advancing steering valve 42.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a marine main machine turbine control device, a marine main machine turbine equipment, and a marine main machine turbine control method.

In a marine main engine turbine mounted on a ship, if the ship is stopped for a long time after navigation, the turbine rotor in a high temperature state may be deformed by its own weight.
In order to prevent this deformation, “auto spin” is generally performed. Autospin refers to the following process.
When it is detected that the main shaft of the marine main engine turbine has stopped rotating for a predetermined time or longer, the forward control valve is automatically opened to rotate the turbine rotor. Further, when the turbine rotor reaches a predetermined rotational speed, the forward control valve is closed and the main shaft stops rotating again. When it is detected that the rotation stop has reached a predetermined time or longer, the reverse operation valve is automatically opened and the turbine rotor is rotated again.
In this way, deformation of the stopped turbine rotor is prevented by autospinning that rotates the turbine rotor by repeatedly opening and closing the forward control valve and the reverse control valve.

This auto-spin is performed for the purpose of preventing deformation of the turbine rotor that is stopped as described above, and steam is not generated until the main shaft stops rotating after the forward control valve or the reverse control valve is closed. Not thrown in. For this reason, the load on the boiler does not increase, and the turbine casing is cooled by the low temperature steam entering the turbine casing.
Further, since the turbine casing is cooled, when starting the main engine turbine, it is necessary to warm up the main engine turbine such as manually opening a valve and supplying steam by direct control of the operator.
Therefore, it has been studied to give the autospin a warm-up effect. For example, Patent Document 1 discloses that the amount of steam input is increased by maintaining the forward control valve or the reverse control valve at a predetermined valve opening for a certain period of time during auto-spin so that the auto-spin has a warm-up effect. ing.

Japanese Patent No. 4446992

  However, in the invention disclosed in Patent Document 1, when switching between opening and closing of the forward valve and the reverse valve, a predetermined valve opening is determined, and switching is controlled based on the valve opening. For example, if the rotation of the main shaft is hindered by external force, the rotation of the turbine rotor may be hindered even if the forward control valve or the reverse control valve is opened at a predetermined valve opening, and the turbine rotor does not rotate. There was a problem that the forward control valve and the reverse control valve were opened and closed as they were, and as a result, the engine could not be warmed up.

  The present invention has been made in view of such circumstances, and is a marine main engine turbine control device, a marine main engine turbine facility, and a marine main engine turbine that reliably rotate a turbine rotor and perform auto-spinning with a warm-up effect. An object is to provide a control method.

In order to solve the above problems, the marine main engine turbine control device, marine main machine turbine equipment, and marine main engine turbine control method of the present invention employ the following means.
The marine main engine turbine control apparatus according to the first aspect of the present invention is a marine main engine turbine control apparatus that controls a marine main machine turbine including a forward control valve and a reverse control valve, and when the marine main engine turbine is stopped, The forward control valve is opened, and when the forward control valve is open, when the main shaft turbine speed of the marine main engine turbine reaches a first threshold value, the forward control valve is fully closed and at the same time the reverse control valve is opened, If the main shaft turbine speed of the marine main engine turbine reaches a second threshold value when the reverse control valve is open, the reverse control valve is fully closed and the forward control valve is opened at the same time, and the forward control valve and the reverse control are opened. Control to alternately open and close the valve.

When the main marine turbine is stopped, that is, when it is detected that the main shaft speed of the marine main turbine is 0 rpm, the forward control valve is opened until the main shaft speed reaches the first threshold value. At the same time, the reverse control valve is opened until the spindle rotational speed reaches the second threshold value. Next, when the main shaft rotation speed reaches the second threshold value, the reverse operation valve is fully closed, and at the same time, the forward operation valve is opened until the main shaft rotation speed reaches the first threshold value. According to this configuration, steam can be continuously introduced into the cabin of the marine main engine turbine by performing control to alternately switch between opening and closing of the forward control valve and the reverse control valve. In this way, by increasing the amount of steam input, it is possible to keep the boiler load constant by providing a warm-up effect so as to maintain the turbine casing temperature, and at the time of starting the marine main engine turbine, the start time Can be shortened.
In addition, since switching between opening and closing of the forward control valve and the reverse control valve is performed based on the main shaft rotation speed, the valve is kept open until the turbine rotor rotates even in a situation where the rotation of the main shaft is hindered by an external force. Thus, the turbine rotor can be reliably rotated.
In a marine main engine turbine, the turbine rotor is automatically rotated in order to prevent deformation of the turbine rotor due to its own weight when stopped (hereinafter referred to as “auto spin”). By combining this configuration with this autospin, it is possible to give the autospin a further warm-up effect.

  In the first aspect, the second threshold value may be greater than 0 and smaller than the first threshold value.

Since the first threshold value used as a reference for closing the forward control valve is larger than the second threshold value used as a reference for closing the reverse control valve, the first threshold value is higher than that for the forward high-pressure turbine using high-temperature high-pressure steam. The amount of steam input to the reverse low-pressure turbine, which is a low-pressure turbine that inputs a large amount of steam and does not require a large amount of steam as compared with the high-pressure turbine, is less than that of the forward high-pressure turbine. Thereby, warming-up of the high pressure turbine for advance can be performed preferentially, and an efficient warming-up effect is acquired.
Further, it is possible to prevent excessive steam from being introduced into the low-pressure turbine for backward travel. The reverse low-pressure turbine is not designed to be charged with a large amount of steam. If excessive steam is charged, deformation due to heat may occur. Therefore, it is possible to prevent the thermal deformation of the casing of the reverse low-pressure turbine, the interference between the turbine rotor and the stationary part due to the thermal deformation, and the abnormal vibration due to the interference.

  In the first aspect, the first threshold value is not reached even when the forward control valve reaches the maximum forward control valve opening degree, or the second threshold value is reached even when the reverse steering valve reaches the reverse steering valve maximum opening degree. If it does not reach, an alarm may be notified.

If the main shaft does not rotate due to an external force such as tidal current or drifting material, if the valve is kept open until it rotates, the factor may be removed, causing the turbine rotor to rotate rapidly, causing failure. Can be.
According to this configuration, even if the forward control valve or the reverse control valve reaches the maximum opening degree, an alarm is notified when the spindle speed does not reach each threshold value. An operator can be notified that there is. The operator who has received the alarm notification responds, for example, by turning on the turning device to check the abnormality of each part of the turbine, or gradually opening the valve manually under the supervision of the crew. The response of these operators can prevent rapid rotation of the turbine rotor.

  A marine main engine turbine facility according to a second aspect of the present invention includes a marine main engine turbine and the marine main engine turbine control device according to any one of the foregoing.

  A marine main machine turbine control method according to a third aspect of the present invention is a marine main machine turbine control method for controlling a marine main machine turbine, and when the marine main machine turbine stops, a step of controlling in a forward direction, and a forward direction. When the main shaft turbine speed of the marine main engine turbine reaches the first threshold when controlling, the control in the forward direction is stopped and simultaneously the control is performed in the reverse direction. When the main shaft turbine is controlled in the reverse direction, the main engine turbine of the marine main engine turbine is controlled. When the spindle speed reaches the second threshold value, the control in the reverse direction is stopped and simultaneously the control in the forward direction is performed, and the control in the forward direction and the control in the reverse direction are alternately switched.

  According to the present invention, since the auto-spin with the increased amount of steam input is performed based on the rotational speed of the main shaft of the main turbine, the turbine rotor can be reliably rotated to warm up, and the auto-spin has a warm-up effect. You can have it. Further, the start-up time of the main engine turbine can be shortened by warming up at the time of stop.

1 is a schematic configuration diagram showing a marine main engine turbine facility according to an embodiment of the present invention. It is the flowchart which showed the control by the marine main engine turbine control apparatus which concerns on one Embodiment of this invention. It is the time chart which showed the main shaft rotation speed of the marine main engine turbine which concerns on one Embodiment of this invention, the forward steering valve opening degree, and the reverse steering valve opening degree.

Hereinafter, an embodiment of a marine main engine turbine control device, a marine main engine turbine facility, and a marine main engine turbine control method according to the present invention will be described with reference to the drawings.
Hereinafter, an embodiment of the present invention will be described with reference to FIGS.
FIG. 1 shows a schematic configuration of a marine main engine turbine facility according to the present embodiment.
As shown in FIG. 1, a marine main engine turbine facility 1 according to the present embodiment is, for example, LNG.
Used for propulsion of ships such as ships. The marine main engine turbine equipment 1 includes a steam turbine 2 that is a main engine, a speed reducer 28, and a propeller 29.

  The steam turbine 2 is, for example, a reheat 3-pressure steam turbine that is used as a main power machine of the marine main engine turbine equipment 1, and includes an HP turbine 21, an IP turbine 22, an LP turbine 23, an AST turbine 24, And a heater 25.

The main steam from the main boiler 32 is supplied to the HP turbine 21 via the main steam pipe 31, and thereby the HP turbine 21 is rotationally driven.
The reheater 25 is disposed between the HP turbine 21 and the IP turbine 22, and heats the steam exhausted from the HP turbine 21 (low temperature) and guided through the reheat steam pipe 33. The steam heated by the reheater 25 is supplied to the IP turbine 22 via the (hot) reheat steam pipe 34.

  The IP turbine 22 is supplied with reheated steam heated by the reheater 25, and thereby the IP turbine 22 is rotationally driven. The IP turbine 22 and the HP turbine 21 are provided on a common first shaft 26.

The LP turbine 23 is supplied with the steam exhausted from the IP turbine 22 and guided through the steam pipe 35, and thereby the LP turbine 23 is rotationally driven. The steam exhausted from the LP turbine 23 and led to the main condenser 37 through the condensate pipe 36 is condensed in the main condenser 37 and becomes condensate.
The AST turbine 24 is used when the marine vessel moves backward, and main steam from the main boiler 32 is directly supplied via the reverse main steam pipe 38 branched from the middle of the main steam pipe 31, whereby the AST turbine 24 is It is designed to rotate. The AST turbine 24 and the LP turbine 23 are provided on a common second shaft 27.

  The first shaft 26 and the second shaft 27 described above are connected to the speed reducer 28 as input shafts, and a main shaft 30 is connected to the output side of the speed reducer 28. Further, a propeller 29 is connected to the main shaft 30, and the propeller 29 is rotated by the main shaft 30. The propulsion force of the ship is obtained by the rotation of the propeller 29.

In FIG. 1, reference numerals 41 and 42 denote a forward cutoff valve and a forward steering valve provided in the middle of the main steam pipe 31, and reference numeral 43 denotes a reheat provided in the middle of the (high temperature) reheat steam pipe 34. The steam stop valves 44 and 45 are a reverse operation valve and a reverse intermediate valve provided in the middle of the reverse main steam pipe 38.
1 is a water supply pipe that guides the condensed water condensed in the main condenser 37 to the main boiler 32, and 47 is a condensate pump provided in the middle of the water supply pipe 46.

  The marine main engine turbine control device 100 acquires the rotational speed of the main shaft 30 and controls the valve opening degree of the forward control valve 42 and the valve opening degree of the reverse control valve 44.

  The marine main engine turbine control device 100 includes, for example, a CPU (Central Processing Unit), a RAM (Random Access Memory), a ROM (Read Only Memory), a computer-readable storage medium, and the like. A series of processes for realizing various functions is stored in a storage medium or the like in the form of a program as an example, and the CPU reads the program into a RAM or the like to execute information processing / arithmetic processing. As a result, various functions are realized. The program is preinstalled in a ROM or other storage medium, provided in a state stored in a computer-readable storage medium, or distributed via wired or wireless communication means. Etc. may be applied. The computer-readable storage medium is a magnetic disk, a magneto-optical disk, a CD-ROM, a DVD-ROM, a semiconductor memory, or the like.

FIG. 2 is a flowchart showing the control by the marine main engine turbine control device according to the present embodiment.
FIG. 3 also shows the main shaft speed, forward steering valve opening, and reverse steering valve opening of the marine main engine turbine according to this embodiment in a time chart. The direction of the arrow on the vertical axis in FIG. 3 indicates the opening degree of the forward control valve and the rotational speed when the main shaft rotates in the forward direction, and the direction opposite to the arrow on the vertical axis indicates the opening degree of the reverse control valve and the rotational direction of the main shaft in the reverse direction. The number of rotations and the horizontal axis are time. The solid line represents the opening degree of the forward control valve or the reverse control valve, and the alternate long and short dash line represents the rotational speed of the main shaft.
Control by the marine main engine turbine control device in the present embodiment will be described below with reference to FIGS. 2 and 3.
Here, the rotational speed of the main shaft 30 used as a reference for closing the forward control valve 42 is a first threshold value, and the rotational speed of the main shaft 30 used as a reference for closing the reverse control valve is a second threshold value. The second threshold value is a value greater than 0 and smaller than the first threshold value, and is an absolute value. In the present embodiment, 5 rpm is set as the first threshold, and 3 rpm is set as the second threshold.

  When the ship stops, the main shaft 30 of the steam turbine 2 gradually decreases in rotational speed, and as shown in step S201 in FIG. 2, the main engine turbine control device 100 detects the stop of the rotation of the main shaft 30 of the steam turbine 2. . The rotation stop of the main shaft 30 means that the main shaft rotation speed becomes 0 rpm as indicated by a one-dot chain line of time t1 in FIG. When the marine main engine turbine control device 100 detects that the main shaft 30 has stopped rotating, the process proceeds to step S202.

  In step S202, the marine main engine turbine control apparatus 100 gradually opens the forward control valve 42 as shown by the solid line from time t1 to time t2 in FIG. 3 in accordance with a preset time schedule. As a result, main steam is gradually introduced from the main boiler 32 into the HP turbine 21 through the main steam pipe 31. Therefore, as the HP turbine 21 rotates, the rotational speed of the main shaft 30 gradually increases as indicated by a one-dot chain line from time t1 to time t2 in FIG.

  Next, it is determined by the marine main engine turbine control device 100 whether or not the rotational speed of the main shaft 30 is 5 rpm or more (S203). If it determines with the rotation speed of the main axis | shaft 30 being 5 rpm or more, it will transfer to step S204. If it determines with the rotation speed of the main axis | shaft 30 being less than 5 rpm, it will change to step S211.

  When the rotation speed of the main shaft 30 is 5 rpm or more, that is, when the rotation speed of the main shaft 30 reaches 5 rpm, the marine main engine turbine control device 100 closes the forward control valve 42 as shown by the solid line at time t2 in FIG. 3 (S204). ).

  When the forward control valve 42 is fully closed as shown by the solid line at time t3 in FIG. 3, the reverse control valve 44 is simultaneously opened, and from time t3 to time t4 in FIG. 3 according to a preset time schedule. As shown by the solid line, the marine main engine turbine control apparatus 100 gradually opens the reverse operation valve 44 (S205). As a result, the main steam is gradually introduced from the main boiler 32 into the AST turbine 24 through the reverse main steam pipe 38. Therefore, as the AST turbine 24 rotates, the main shaft 30 gradually stops rotating in the forward direction and transitions to the backward direction rotation, as indicated by the one-dot chain line of time t3 to t4 in FIG. The rotational speed due to increases gradually.

If it is determined in step S203 that the rotational speed of the main shaft 30 is less than 5 rpm, the marine main engine turbine control device 100 determines whether or not the opening degree of the forward control valve 42 is the maximum opening degree ( S211). Here, the maximum opening of the forward control valve 42 is an upper limit value of the opening of the forward control valve 42. If the rotation of the main shaft is obstructed for some reason, if the valve is kept open so that the main shaft rotation speed becomes 5 rpm, the turbine rotor may rotate rapidly due to the removal of the factor, which may cause failure. obtain. Therefore, rapid rotation is prevented by providing a restriction on the opening.
When it is determined that the opening degree of the forward control valve 42 is the maximum opening degree, the process proceeds to step S212. If it is determined that the opening degree of the forward control valve 42 is not the maximum opening degree, the process returns to step S202.

When it is determined that the opening degree of the forward control valve 42 is the maximum opening degree, the opening degree is the maximum opening degree even though the rotational speed of the main shaft 30 does not reach 5 rpm. It may not be rotating. Therefore, in order to prevent rapid rotation, the marine main engine turbine control apparatus 100 notifies an alarm (S212). By notifying the alarm, the operator can be alerted. The operator who has received the alarm notification responds, for example, by turning on the turning device to check the abnormality of each part of the turbine, or gradually opening the valve manually under the supervision of the crew. The response of these operators can prevent rapid rotation of the turbine rotor.
If it is determined that the opening degree of the forward control valve 42 is not the maximum opening degree, the process returns to step S202, and the forward control valve 42 is further opened by the marine main engine turbine controller 100 as shown by the dotted line at time t2 in FIG. It is. In this case, the forward control valve 42 is opened until the rotation speed of the main shaft 30 reaches 5 rpm, or until the opening degree of the forward control valve 42 reaches the maximum opening degree.

In step S205, the reverse operation valve 44 is gradually opened by the marine main engine turbine controller 100, whereby the rotational speed of the main shaft 30 is increased.
Next, it is determined by the marine main engine turbine control device 100 whether or not the rotational speed of the main shaft 30 is 3 rpm or more (S206). If it determines with the rotation speed of the main axis | shaft 30 being 3 rpm or more, it will transfer to step S207. If it determines with the rotation speed of the main axis | shaft 30 being less than 3 rpm, it will change to step S221.

  When the rotational speed of the main shaft 30 is 3 rpm or more, that is, when the rotational speed of the main shaft 30 reaches 3 rpm, the marine main engine turbine control device 100 closes the reverse operation valve 44 as shown by the solid line at time t4 in FIG. 3 (S207). ).

  As shown by the solid line at time t5 in FIG. 3, when the backward control valve 44 is fully closed, the forward control valve 42 is opened at the same time, and in accordance with a preset time schedule, from time t5 to time t6 in FIG. As shown by the solid line, the marine main engine turbine controller 100 gradually opens the forward control valve 42 (S208). As a result, main steam is gradually introduced from the main boiler 32 into the HP turbine 21 through the main steam pipe 31. Therefore, as the HP turbine 21 rotates, the rotation of the main shaft 30 gradually stops in the reverse direction and changes to the forward direction rotation as indicated by the one-dot chain line of time t5 to t6 in FIG. The rotational speed due to increases gradually.

If it is determined in step S206 that the rotational speed of the main shaft 30 is less than 3 rpm, the marine main engine turbine control device 100 determines whether or not the opening degree of the reverse operation valve 44 is the maximum opening degree ( S221). Here, the maximum opening degree of the reverse operation valve 44 is an upper limit value of the opening degree of the reverse operation valve 44. Rapid rotation is prevented by providing a maximum opening.
When it is determined that the opening degree of the reverse operation valve 44 is the maximum opening degree, the process proceeds to step S222. When it is determined that the opening degree of the reverse operation valve 44 is not the maximum opening degree, the process returns to step S205.

When it is determined that the opening degree of the reverse operation valve 44 is the maximum opening degree, the opening degree is the maximum opening degree even though the rotational speed of the main shaft 30 does not reach 3 rpm. It may not be rotating. Therefore, in order to prevent rapid rotation, the marine main engine turbine control apparatus 100 notifies an alarm (S222). By notifying the alarm, the operator can be alerted. The operator who has received the alarm notification responds, for example, by turning on the turning device to check the abnormality of each part of the turbine, or gradually opening the valve manually under the supervision of the crew. The response of these operators can prevent rapid rotation of the turbine rotor.
If it is determined that the opening degree of the reverse operation valve 44 is not the maximum opening degree, the process returns to step S205, and the reverse operation valve 44 is further opened by the marine main engine turbine controller 100 as shown by the dotted line at time t4 in FIG. It is. In this case, the reverse control valve 44 is opened until the rotation speed of the main shaft 30 reaches 3 rpm or until the opening degree of the reverse control valve 44 reaches the maximum opening degree.

In step S208, the forward control valve 42 is gradually opened, whereby the rotational speed of the main shaft 30 is increased, and the process returns to step S203 to determine again whether the rotational speed of the main shaft 30 is 5 rpm or more.
Subsequently, as shown after time t6 in FIG. 3, the marine main engine turbine controller 100 alternately opens and closes the forward control valve 42 and the reverse control valve 44.
With the above control, the marine main engine turbine control apparatus 100 opens and closes the forward control valve 42 and the reverse control valve 44 based on the number of rotations of the main shaft 30.

As described above, according to the marine main engine turbine control device, marine main engine turbine equipment, and marine main engine turbine control method according to the present embodiment, the following operational effects are achieved.
When it is detected that the steam turbine 2 is stopped, that is, the rotation speed of the main shaft 30 of the steam turbine 2 is 0 rpm, the forward control valve 42 is opened until the main shaft rotation speed reaches 5 rpm which is the first threshold value, and reaches 5 rpm. The forward control valve 42 is fully closed, and at the same time, the reverse control valve 44 is opened until the spindle speed reaches 3 rpm, which is the second threshold value. Next, when the main shaft rotation speed reaches 3 rpm, the reverse operation valve 44 is fully closed, and at the same time, the forward operation valve 42 is opened until the main shaft rotation speed reaches 5 rpm. According to this configuration, steam can be continuously supplied to the passenger compartment of the steam turbine 2 by performing control to alternately switch between opening and closing of the forward control valve 42 and the reverse control valve 44 in this way. By increasing the amount of steam input in this way, the load on the main boiler 32 can be kept constant by providing a warm-up effect so as to maintain the turbine casing temperature, and at the time of starting the steam turbine 2 Startup time can be shortened.
In addition, since switching between opening and closing of the forward control valve 42 and the reverse control valve 44 is performed based on the main shaft rotation speed, the valve is opened until the turbine rotor rotates even in a situation where the rotation of the main shaft is hindered by an external force. The turbine rotor can be reliably rotated by this.
In the steam turbine 2, autospin that automatically rotates the turbine rotor is performed in order to prevent deformation due to the weight of the turbine rotor when stopped. By combining this configuration with this autospin, it is possible to give the autospin a further warm-up effect.

Further, according to the present embodiment, since the first threshold value used as a reference for closing the forward control valve 42 is larger than the second threshold value used as a reference for closing the reverse control valve 44, high-temperature and high-pressure steam is supplied. More steam is input to the HP turbine 21 to be used, and less steam is input to the AST turbine 24, which is a low pressure turbine that does not require a larger amount of steam than the HP turbine 21, compared to the HP turbine. . Thereby, warming-up of the HP turbine 21 can be performed preferentially, and an efficient warming-up effect is obtained.
Further, excessive steam can be prevented from being introduced into the AST turbine 24. The AST turbine 24 is not designed to be charged with a large amount of steam. If excessive steam is charged, there is a possibility that deformation due to heat may occur. Therefore, the thermal deformation of the casing of the AST turbine 24, the interference between the turbine rotor and the stationary part due to the thermal deformation, and the abnormal vibration due to the interference can be prevented.

  Further, according to the present embodiment, an alarm is notified when the main shaft rotation speed does not reach each threshold even when the forward control valve 42 or the reverse control valve 44 reaches the maximum opening degree. It is possible to notify the operator that there is a risk. The operator who has received the alarm notification responds, for example, by turning on the turning device to check the abnormality of each part of the turbine, or gradually opening the valve manually under the supervision of the crew. The response of these operators can prevent rapid rotation of the turbine rotor.

  As mentioned above, although one embodiment of the present invention has been described in detail with reference to the drawings, the specific configuration is not limited to this embodiment, and includes design changes and the like without departing from the gist of the present invention. .

  For example, in the above-described embodiment, the first threshold value, which is the rotation speed of the main shaft 30 used as a reference for closing the forward control valve 42, is 5 rpm, and the rotation speed of the main shaft 30 used as a reference for closing the reverse control valve 44. Although the second threshold value is 3 rpm, any value may be set as long as the number of revolutions is such that the ship does not move.

  In the above-described embodiment, the time schedule of the opening degree of the forward control valve 42 and the reverse control valve 44 is shown in FIG. 3, but another arbitrary time schedule may be set.

1 Marine marine turbine equipment 2 Steam turbine (marine marine turbine)
21 HP turbine 22 IP turbine 23 LP turbine 24 AST turbine 25 Reheater 30 Main shaft 32 Main boiler 42 Forward control valve 44 Reverse control valve 100 Marine main engine turbine control device

Claims (5)

A marine main engine turbine control device for controlling a marine main engine turbine provided with a forward control valve and a reverse control valve,
When the marine main engine turbine stops, the forward control valve is opened,
If the main shaft turbine speed of the marine main engine turbine reaches a first threshold when the forward control valve is open, the forward control valve is fully closed and at the same time the reverse control valve is opened,
If the main shaft turbine speed of the marine main engine turbine reaches a second threshold when the reverse control valve is open, the reverse control valve is fully closed and at the same time the forward control valve is opened,
A marine main engine turbine control device that performs control for alternately switching between opening and closing of the forward control valve and the reverse control valve.   2. The marine main engine turbine control device according to claim 1, wherein the second threshold value is larger than 0 and smaller than the first threshold value.   If the forward control valve does not reach the first threshold even when the forward control valve reaches the maximum opening, or if the reverse control valve does not reach the second threshold even when the reverse control valve reaches the maximum opening, an alarm The marine main engine turbine control apparatus of Claim 2 which notifies. A marine main engine turbine;
A marine main engine turbine control device according to any one of claims 1 to 3,
A marine main engine turbine facility equipped with A marine main engine turbine control method for controlling a marine main engine turbine,
When the marine main engine turbine stops, a step of controlling in the forward direction;
When the main shaft turbine speed of the marine main engine turbine reaches the first threshold when controlling in the forward direction, the control in the forward direction is stopped simultaneously with the control in the reverse direction,
When the main shaft turbine speed of the marine main engine turbine reaches the second threshold when controlling in the reverse direction, the control in the reverse direction is stopped at the same time as the control in the reverse direction is stopped,
A marine main engine turbine control method for performing control for alternately switching between forward control and reverse control.

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