DE2205809B1 - STEAM POWER PLANT FOR MARINE DRIVE - Google Patents

Description

a) the reverse steam turbine (20) consists of a low-pressure stage, which has a Reverse valve (21) is connected to the reheater (5);

b) parallel to the high pressure stage (4) of the forward steam turbine (4,7) is a bypass line (25) is provided, which connects the main steam line with the reheater (5), with in the bypass line (25) a bypass throttle valve (26) having a water injection valve (27) is provided;

c) when driving forward are the reverse valve (21) and the bypass throttle valve (26) and the water injection valve (27) closed, while a high pressure valve (3) and a low-pressure valve (6) upstream of the high-pressure stage (4) or the low-pressure stage (7) the forward steam turbine is open;

d) when switching to reverse, the reverse valve (21), the Bypass throttle valve (26) and the water injection valve (27) in the opening sense and the high pressure valve (3) and the Low pressure valve (6) actuated in the closing sense.

2. Plant according to claim 1, characterized in that one with the shaft of the ship's propeller (8) or with an associated shaft of the transmission that can be disengaged Locking device and a control device are provided, which depends on the measured braking torque the opening of the high pressure valve (3) and the low pressure valve (6) the forward steam turbine (4,7) on the one hand opposite the reverse valve (21) of the Reverse steam turbine (20) on the other hand adjusted in opposite directions.

The invention relates to a steam power plant for ship propulsion, which is used for forward travel Existing high-pressure stage and low-pressure stage with intermediate superheater Forward steam turbine and a reverse steam turbine for reverse travel, the Forward and reverse steam turbine alternately via valves that can be operated in opposite directions can be switched on.

In a system of this type known from German utility model 1 779 022, the reverse steam turbine is used the high pressure and the low pressure stage of the forward steam turbine in parallel

S IeI switched so that when reversing with Live steam is operated. This means that the reverse steam turbine is structurally similar Requires effort like the forward steam turbine. The reverse steam turbine is therefore

ίο expensive. Another disadvantage is that at Reverse travel does not allow steam to flow through the reheater and therefore prevents it from burning must be protected. This is done e.g. by arranging the reheater in one Area of relatively low flue gas temperature, which means that the reheater surface is quite must be sized large.

The invention is based on the object of creating a steam power plant for ship propulsion which the effort for the reverse steam turbine is small and sufficient even when reversing Steam cooling of the reheater is guaranteed.

According to the invention, this object is achieved in a steam power plant of the type specified at the beginning solved by the combination of the following features:

a) The reverse steam turbine consists of a low-pressure stage, which is operated via a reverse valve connected to the reheater;

b) parallel to the high pressure stage of the forward steam turbine is a bypass line provided, which connects the main steam line with the reheater, wherein in the A bypass throttle valve with a water injection valve is provided;

c) when driving forward are the reverse valve and the bypass throttle valve as well as the Water injection valve closed while a high pressure valve and a low pressure valve are in front the high pressure stage or the low pressure stage of the forward steam turbine are open;

d) when switching to reverse, the reverse valve, the bypass throttle valve as well as the water injection valve in the opening sense and the high pressure valve and the low pressure valve in the closing sense actuated.

The fact that the reverse steam turbine is designed as a low-pressure stage results in this a cost-saving design. Another advantage of the invention is that because of the connectivity the reverse steam turbine with the reheater outlet always, i.e. also when switching from forward travel to reverse travel and vice versa, good cooling of the reheater is achieved will. By attaching the bypass throttle valve with water injection valve, it is possible to to generate an additional amount of steam in this device, so that even when driving backwards high performance is achieved. Another advantage is that the The latter device can also be in operation when the ship is in port, so that then low-pressure steam can be generated in large quantities for heating purposes.

3 4

The arrangement of the high pressure stage of the reheater5 for reverse steam

Steam power plant bypassing line with a turbine 20, which entaeuenize the ship's propeller 8

bypass throttle valve and a water insert- ed direction than before. The Indian

injection valve is known per se from the German reverse steam turbine 20 is expanded steam

Auslegeschrift 1 426 901.5 deposited in the capacitor 10 and arrives

One embodiment of the invention is also back to the steam generator 1 in FIG. To this

The following description on the basis of the drawing provides good cooling even when driving backwards.

purifies. It shows a schematically simplified development of the reheater 5 ensured. Further

Fig. 1 a steam power plant according to the invention, it is possible when the ship is in port, the

and ίο to supply steam consumer 30 with steam, the

Fig. 2 shows a locking device with braking torque then via the bypass line 25 and the intermediate

gel device. between superheater 5 flows.

The system housed in a ship consists, as shown in FIG. 1 dashed to the according to FIG. 1 essentially consists of a steamer bypass throttle valve 26 and the valves 3, generator 1 with superheater 2, a high pressure stage 4, 15 27.6 and 21 leading pulse lines as well as the one Reheater 5, which results in a low-pressure plus and minus sign, are the stage 7, with stages 4 and 7 blocking the forward valves against each other in such a way that at Form steam turbine, as well as a backward steam forward and in reverse the above-mentioned turbine 20, which is intended for reversing. th positions for the valves result. Pressing The forward steam turbine 4, 7 and the reverse 20 of the valves are carried out from a maneuvering stand 50 Steam turbine 20 are made via a not shown. The blocking can be at least partially Gear connected to a ship propeller 8. Which are also canceled. For example, at Low pressure stage 7 and the reverse steam turbine slower forward travel, so when the high pressure 20 are connected to a condenser 10, the valve 3 is partially open, the bypass a condensate pump 11, a feedwater 25 throttle valve 26 and the water injection valve 27 container 12 and a feed pump 13 which opens to the steam consumers 30 to the steam generator 1 is in communication. to be able to additionally supply reduced steam. In

Before each of the two stages 4 and 7 enter this operating state, the low-pressure valve 6 and the reverse steam turbine 20 can be a high-pressure valve 3, a low-pressure valve 6 and a 30, so that the high-pressure stage 4 is predominantly a throttle position Reverse valve 21 is provided, with which the loading or alone supplies the drive power,
appropriate stage or turbine switched on and off. In addition, the blocking of the valves 3,6 can be. Parallel to the high pressure valve 3 and and 21 are canceled when the steam generator to the high pressure stage 4 is approached a bypass line 25 ger or just before the departure of the attached in which a bypass throttle valve 26 35 ship. In this case, steam can be arranged at the same time as the water injection valve 27, so that stages 4 and 7 of the forward steam turbine and live steam exiting from the superheater 2 can be given to the reverse steam turbine 20, be throttled and cooled. The feed water injected to cool it to heat the two turbines and the Leides live steam is fed to lines or to increase the load of the steam generator via a line 28 which runs between feeders. The valves are to be set so that the pump 13 and steam generator I branch off from the feed line, torque and device exerted by stages 4 and 7. At the outlet of the intermediate surplus, the decomposition 5 exerted by the reverse steam turbine 20, at which the low-pressure valve 6 and the torque cancel each other out. A device for reversing valve 21, the low pressure stage 7 and such setting of the valves 3, 6 and 21 is connected to the reverse steam turbine 20, 45 F i g. 2 shown. On the not shown branches off a line 31 with valve 32, which leads to the shaft of the ship's propeller 8 is a gear-like steam consumer 30, as it is fastened on ships via disk 40, with the lent in a tooth gap. Washer 40 a pawl 41 can be inserted

When the ship is moving forward, these can be opened and closed with the help of a servo motor 42

Bypass throttle valve 26 and the water inlet 50 can be moved away. The pawl 41 is by means of a

Injection valve 27 and the reverse valve 21 ge elongated hole 43 guided on a bolt 44. Vicinity

closed and the high pressure valve 3 and the lower end of the pawl 41 is on the

Low pressure valve 6 open. So it flows steam on opposite sides of the pawl one each

from the superheater 2 in the high pressure stage 4, spring 45 is attached, which the pawl always in the

There it is partly relaxed and then try to bring it to the middle position in between. In front of the pawl 41

Superheater 5 is overheated again, after which a spatially fixed bolt 46 is provided on this steam

in the low pressure stage 7 further relaxed and an angle lever 47 is pivotably mounted,

finally deposited in the capacitor 10 whose one downward arm is between

will. The condensate then passes through the condensate- two parallel guide pins attached to the pawl

sat pump 11. the feed water tank 12 and the 60 walls 48 protrudes, while the other arm of the

Feed pump 13 back to steam generator 1. Angle lever tapping a potentiometer 49

When reversing, the high pressure valve 3 is formed. A servomotor 51 is attached to the potentiometer

and the low-pressure valve 6 closed and connected, the rotary movement in an axial

Bypass throttle valve 26 as well as the Wasscrein- movement of a rod 52 transformed. The rod 52

injection valve 27 and the reverse valve 21. open 65 is attached to one arm of a three-armed lever 53-

net. The steam now flows out of the overheat lock. On the other two arms of the lever

/ he 2 via the bypass line 25. where he has 53 operating rods for the valves 3 and 6

Pressure and its temperature is reduced, and the forward steam turbine on the one hand and the reverse

COPV

wärtsiahrventi! 21 connected on the other hand. In the The rod 54 of a servomotor 55 is located between the two last-mentioned actuation rods articulated, which is under the influence of a signal coming from the maneuvering station 5 ((.

When starting the steam generator or shortly before departure of the ship, when the valves 3 and 6 of the forward steam turbine and the reverse valve 21 are open at the same time, the pawl 41 is pushed into a tooth gap of the disc 40 by means of the servo motor 42, as shown in F i g. 2 is shown. If the steam quantities flowing into the turbines 4, 7 and 21 are so different that a greater torque is exerted on the ship's propeller in one direction, the pawl 41 is deflected around the bolt 44 somewhat to the right or to the left. This deflection results in a pivoting of the angle lever 47 and thus a change in the voltage L ' tapped at the potentiometer 49. Corresponding to this voltage change, the three-armed lever 53 is pivoted about the pivot point of the rod 54 clockwise or counterclockwise via the servomotor 51 and the rod 52, so that the valves 3 and 6 of the forward steam turbine on the one hand and the valve 21 of the reverse Steam turbine on the other hand are operated in opposite directions to each other. As a result, the steam quantities flowing into the turbines 4, 7 and 20 are influenced in such a way that the two torques are equal and the pawl 41 returns to its central position. After the start of the steam generator or when the ship leaves, the locking device is switched off with the aid of the servo motor 42.

1 sheet of drawings

Claims (1)

Patent claims: 1. Steam power plant for ship propulsion, which has a high pressure stage and for forward travel Low pressure stage with intermediate superheater existing forward steam turbine and a reverse steam turbine for reverse travel, with the forward and reverse steam turbines above Valves that can be actuated in the opposite sense can be switched on alternately skid, marked by combining the following features: