Ship power plant fuel feed device

FIELD: transport.

SUBSTANCE: invention relates to device for feeding fuel in power plant of a ship carrying liquefied gas from ship liquefied gas tank. Ship comprises at least one liquefied gas tank 2 and onboard power plant, and device to feed fuel into said power plant. Proposed device comprises pump 20, vessel 23, injector 12 and fluid line. Said pump is mounted on vessel bottom. Container is arranged in vessel around the pump to support immersed pump. Aforesaid fluid ejector is arranged inside said vessel to suck off liquefied gas from its bottom. Fluid line (21, 22, 24, 250) communicates pump outlet with injector inlet on one side and, on the other side, it communicates injector outlet with vessel.

EFFECT: reduced risks of pump outage or damage.

10 cl, 3 dwg

 

The present invention relates to a device for supplying fuel onboard propulsion system for the carriage of liquefied gas from the tank for liquefied gas mentioned vessel.

Vessel for transporting liquefied gas, for example, type tanker-metenolone has energy installation to ensure the needs of the vessel in energy, in particular for communicating the motion of the vessel and/or generate electricity for the equipment of the vessel. Installation of this type usually has heat engines that consume gas coming from the evaporator, in which it is served from the tank with liquid gas transported on the ship.

In FR-A-2837783 proposed to supply gas to the evaporator of this type and/or other systems necessary for traffic message, using a pump, submerged to the bottom of the tank vessel. The disadvantages of such placements pump shown when necessary to ensure the movement of the tanker-metenolone, when he loaded the ballast, i.e. when the tanks are emptied. In this case, you must leave the nozzle for LPG at the bottom of the tank to operate the pump. In fact, if the fluid level is too low, sometimes the pump begins to pump the mixture of gas and liquid due to the movement of cargo that is fraught with the danger of stopping or even serious damage to the pump is (due to poor cooling, decrease in the intensity and so on).

In FR-A-2832783 the proposed elimination of these disadvantages due to the fact that the pump, also located on the bottom of the tank is surrounded by the collector casing, equipped with a control valve, in order to ensure continuous immersion pump intake even when the tank is not very full and the boat feels keel and rolling. The reliability and efficiency of this device is limited, in particular because the valves can wedge themselves and cease to perform its function and as for filling the collector casing, a relatively regular wave motion, resulting in it is populated by immersion.

In FR-A-2876981 described the feeder, which use the pump on the bridge of the ship, connected with liquid ejector, located at the bottom of the tank. This solution requires the installation of additional elements on the bridge of the ship, in particular, the auxiliary capacity with the need to ensure thermal insulation.

The present invention is the task of creating a feeding device that does not have at least some of the above disadvantages of the prior art. In particular, the present invention is the creation located in the vessel conveying device for the pump, eliminating or reducing the risk OS is anouki or damage to the pump.

To this end, in the invention, an apparatus for supplying fuel to the onboard power plant for the carriage of liquefied gas, of at least one tank for liquefied gas mentioned vessel, comprising a pump located at the bottom of the tank and the tank in the tank around the pump and is designed to maintain the pump intake is submerged, characterized in that it is located in the tank liquid ejector, allowing you to absorb the liquefied gas at the bottom of the tank, and a liquid line connecting the outlet of the pump with the inlet of the injector on the one hand and the outlet of the injector capacity on the other hand.

From the point of view of the invention a liquid ejector, also called Gidrostroy pump means a pump of a particular type having a tube in which the force flow of the pumped fluid under pressure providing suction coming through the end of the pipe.

The ejector generally provides suction at a lower liquid level than conventional pump, which implies the possibility of filling the vessel to maintain the pump intake submerged even at low fluid level in the reservoir. Due to this, you can increase the amount of liquid discharged at the point of discharge of the vessel. Cu is IU, the pump intake is submerged is not affected by the waves.

The ejector is able to function idle (in the absence of fluid intake without the risk of damage or stop. The absence of moving mechanical parts means easy installation and high reliability, as well as work with minor maintenance or maintenance free, requiring technical stop the ship.

In one embodiment, the implementation of the capacity is located away from the ejector. This ensures the freedom of choice of position for the ejector and capacitance, which are connected by a liquid line. For example, the ejector can be placed in the reservoir to collect the liquid where the highest probability of presence given displacement of liquid in the tank during transport on the ship. The site of the pump and the tank can be placed in the tank considering its bulk resistance and mechanical strength.

In another embodiment, the ejector is in contact with the container or is in the tank. The node formed by the tank and ejector, can be pre-assembled and easily installed in the tank. Due to this simplified liquid line.

Capacity mainly has a profile conducive to the extraction of the liquid due to the wave motion of the liquid in the tank. In addition, the output response is the participation of the injector is connected with the capacity liquid line.

In one of the private embodiments tank has a volume of less than 1 m3.

The ejector is mostly suction nozzle, the inlet of which is located at a lower altitude than the pump intake.

The feeder preferably has a supply pipe connecting the liquid line from the power plant.

The supply pipe is mainly connected to the liquid line between the outlet of the injector and capacity. In this case, is limited to the flow, which should ensure the pump. In addition, there is no need to return pipe between the feed pipe and the tank.

In one of the private embodiments mentioned liquid line has a pump regulator located downstream of the pump and upstream of a feed line, and a regulator ejector downstream of a feed line and upstream of the ejector.

The feeder is mainly the return pipe connecting the supply pipe with the capacity of the reverse check valve located in the return pipe and controlled by a pressure sensor located on the feed line.

The feeder preferably has a discharge valve connected with said liquid line upstream of the ejector.

In of the britanii also proposed vessel for transporting liquefied gas, which has at least one tank containing liquefied gas and the onboard power plant, characterized in that it has proposed invention the feeder connecting the said reservoir to the said facility to supply to the installation of fuel from the tank.

To provide a better understanding of the invention and other of its objectives, details, features and advantages hereinafter with reference to the attached drawings described several private embodiments as exclusively non-limiting examples.

In the drawings:

figure 1 shows the functional diagram of the feeder according to the first variant of the invention,

figure 2 shows the functional diagram of the feeder according to the second variant embodiment of the invention, and

figure 3 shows a partial functional diagram of the feeder according to the third variant embodiment of the invention.

The tanker metanews has tanks, which is, for example, four and which is hermetically sealed and thermally insulated storage cargo of liquefied natural gas, for example, a gas with high methane content at a temperature of approximately -160C. At the stern of the ship is the engine room with heat engines driven by the combustion gas, the village is wpaudio from tanks, for example, steam boilers to power steam turbines to movement of the vessel and/or electricity generation.

When the ship is moving with full tanks, as a result of natural evaporation gas in the tanks usually produce large amounts of fuel to ensure the engine in the engine compartment. Usually this evaporating gas is collected in pasborice (not shown) on the upper deck. However, when loaded with ballast, i.e. after emptying its reservoirs, it is mandatory to submit the liquefied gas in the nozzle remaining in one of the tanks, to supply propulsion system of the vessel for which the vessel is equipped with a feeder shown in figure 1.

Shown in figure 1, the feeder has a liquid ejector 12, located at the bottom of the tank 2. Since the liquid ejector of this type is well known to specialists in this field of technology, it makes no sense to give a detailed description. Schematically it has a Laval nozzle to circulate fluid flow, which is a preemptive thread. It also has a suction nozzle 14 is directed toward the bottom of the tank and is connected in the lateral direction with the nozzle. Displacing the flow in the nozzle causes the absorption of liquefied gas through the suction pipe 14, as is shown by the arrow 15.

To create preemptive threads use the pump 20 located at the bottom of the tank 2. The outlet of pump 20 is connected by pipe 24, pipe 250 and the pipe 21 to the inlet of the ejector 16. Line 22 connects the outlet 13 of the ejector with a capacity of 23 located in the tank 2 around the pump 20. The tank 23 is designed for liquefied gas coming from the pipe 22, or a wave of liquid. It has a volume of less than 1 m3and is used for temporary storage of liquid ejected by the ejector 12, to maintain the intake of the pump 20 in submerged condition. Thus, the pipes 21, 22, 24, 250 and capacity of 23 form a liquid line, providing circulation of pressurant flow through the ejector 12 in a closed loop.

On the pipeline 250 between the outlet of pump 20 and the inlet of the ejector 12 is set to the control valve 25 for controlling the flow of the displacing fluid in the pipe 21. Opening of the valve 25 is adjusted automatically. Due to this regulation prevents the falling of the liquid level 27 in the vessel 23 is below a certain threshold, in which case one would run the risk of stopping the pump 20 and its damage. In the process of working capacity 23 provides a supply of fluid that helps to ensure a constant incoming flow into the pump 20 even if time is the main output of the ejector 12 to the surface, for example, due to movement of the cargo during the excitement, resulting in the output stream of liquefied gas from the ejector 12 becomes irregular.

Thus, the presence of the vessel 23 can further reduce the fill level of the tank 2, in which the fuel supply to the engines. The ejector 12, essentially, able to work intermittently, i.e. to catch the wave of liquefied gas, which appears and disappears at the bottom of the tank at each collision with the ejector. Figure 1 shows that the liquid in the tank 2 is below the reception level of the pump 20, but above the level of the inlet of the suction pipe 14. Capacity 23 ensures proper operation in this state, since it maintains a level 27 above the pump intake.

Pipe 250 has a supply pipe 28 located between the outlet of pump 20 and valve 25. The supply pipe 28 can direct part of the condensed gas circulating in the pipe line 250, in requiring supply energy installation in the engine compartment 5. To regulate the flow coming through the supply pipe 28, it is provided with a knob 29 of the flow, the opening and closing of which is controlled by metering fuel engines using illustrated by arrow 30 request signal, which is supplied from the device control is the exercise heat engines in the engine compartment 5. Downstream of the regulator 29 supply pipe 28 communicates with the evaporator 31 for the evaporation of the liquefied gas and its supply in gaseous form in the supplied fuel engines. With feeding pipeline 28 upstream of the regulator 29 is connected to the return pipe 32 which communicates with the tank 23. The return pipe 32 to return the liquefied gas in the direction of the vessel 23, when the pressure in the delivery pipe 28 is too high. For this purpose a pipe 32 provided with a control valve 33, which is controlled in accordance with the sensor signal 34 pressure, measuring the pressure in the pipe 28. Upstream of the regulator 29, the pipe 35 is connected with a feed pipe 28 is connected with the auxiliary systems 36.

In the process flow for the pump 20 regulate by means of a valve 200, is installed on the pipeline 24. The valve 200 is equipped with a control valve 201.

To run the feeder may require other means for supplying fuel into a liquid ejector 12, in addition to the pump 20. For this purpose, the discharge pump 54 or any other pump through pipe 55, which is used for emptying the tank 2 at the point of discharge, is connected with the pipe 21 adoptive pipe 40 having a receiving control valve 410 and outlet of the control valve 540. The valves 41 and 540 have control of the performance communications valves 410 and 541, respectively.

The described device allows you to bring fuel from one or more tanks 2 vessels. In the second case, in each of the tanks in the same way place the pump 20, the container 23 and the liquid ejector 12.

Figure 2 illustrates another variant of implementation of the feeder. In figure 2 we used the same position as to denote identical or similar elements in the embodiment shown in figure 1.

In the illustrated in figure 2 embodiment, the ejector 12 and pump 20 takes the opposite position compared to figure 1, i.e. the pump 20 is located upstream of the ejector 12. The pump 20 is also used to circulate the fluid, but to power the power plant through the supply pipe 28 is used, the flow discharged by the ejector. The excess flow is returned to the tank 23 through pipelines 250 and 21, provides a sufficient level of liquid to prevent stopping of the pump 20.

Compared to the one shown in figure 1 of the embodiment, the pump should take less flow. In fact, the pump only needs to submit the thread is sufficient to operate the ejector, then as shown in figure 1 embodiment, it should also provide the stream to a feed line 28.

In this embodiment, the wasp is estline sensor 34 also allows you to adjust the pressure upstream of the evaporator 31 through action in this case, the valve 25. Because the pipes 250 and 21 serve to reverse the pipeline, there is no need in a special pipe, such as pipe 32 in the variants of implementation, shown in figures 1 and 3.

In one of neprogruntovannye of embodiments downstream of the ejector 12 is patristical.

Figure 3 partially illustrates another variant of implementation of the feeder. Figure 3 used the same position as to denote identical or similar elements in the embodiment shown in figure 1.

Shown in the figure 3 embodiment, the ejector 12 is located in the vessel 23. Its suction nozzle 14 is located on the bottom of the tank 23 and communicates with the reservoir 2. Pumped liquid flows freely from its outlet 13 into the tank 23. In this embodiment, the container 23 and the ejector 12 can be combined into a single unit for installation in the tank 2.

Although the invention is described with respect to several private options for implementation, it is clear that it is not limited and includes all technical equivalents of the described means as well as their combinations if they are included in the scope of the invention.

1. The device for supplying fuel to the power plant for the carriage of liquefied gas, of at least one tank (2) for liquefied natural gas will mention the CSOs vessel, includes pump (20)located on the bottom of the tank and the tank (23)located in the tank around the pump and is designed to maintain the pump intake is submerged, characterized in that it is located in the tank liquid ejector (12)that allows you to suck the liquefied gas at the bottom of the tank and liquid line(21, 22, 24, 25), connecting the outlet of the pump with the inlet of the injector, on the one hand, and the outlet of the injector capacity, on the other hand.

2. The feeder according to claim 1, in which the tank is located away from the ejector.

3. The feeder according to claim 1, in which the ejector is in contact with the container or is in the tank.

4. The feeder according to one of the preceding paragraphs, in which the container has a profile conducive to filling by liquid coming from a full tank, or by a wave of liquefied natural gas.

5. The feeder according to one of claims 1 to 3, in which the said container has a volume of less than 1 m3.

6. The feeder according to one of claims 1 to 3, in which the said ejector has a suction pipe (14), the inlet of which is located at a lower altitude than the pump intake.

7. The feeder according to one of claims 1 to 3, comprising a feed line (28)connecting the liquid line with the energy the practical installation.

8. The feeder according to claim 7, in which the supply pipe (28) is connected to the liquid line between the outlet of the injector and the container.

9. The feeder according to one of claims 1 to 3, comprising an exhaust pump (54), or any other pump of the vessel through pipe (55) connected with the said liquid line upstream of the ejector.

10. Vessel for transporting liquefied gas, having at least one reservoir for liquefied gas and an onboard power plant, characterized in that it has a feeder according to one of claims 1 to 3, connecting the said reservoir to the said facility to supply to the installation of fuel from the above-mentioned reservoir.



 

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