KR101259951B1 - Waste heat supply system and ship with the system - Google Patents

Abstract

A ship and waste heat supply system are disclosed. The vessel according to an embodiment of the present invention is an engine exhaust system including a liquefied natural gas storage tank, an engine and a first exhaust line for discharging the exhaust gas of the engine, a gas combustion unit and a gas combustion unit connected to the liquefied natural gas storage tank. And a gas combustion unit exhaust system including a second exhaust line for discharging the exhaust gas of the engine, and a waste heat recovery system for producing electric power using the exhaust gas of the engine and the exhaust gas of the gas combustion unit.

Description

Waste heat supply system and ship having same {WASTE HEAT SUPPLY SYSTEM AND SHIP WITH THE SYSTEM}

The present invention relates to a waste heat supply system and a ship having the same, and more particularly, to a waste heat supply system utilizing an exhaust gas of an engine and an exhaust gas of a gas combustion device, and a vessel having the same.

As oil prices rise and energy saving issues arise, technology for generating electric power using waste heat such as engine exhaust gas is becoming important. In particular, in the case of a limited amount of power production, such as a ship, technology using waste heat generated in the ship is important.

Vessels do not have a constant supply of waste heat because the engine output changes depending on the operating conditions. Thus, power production using waste heat is not smoothly made.

When the engine output of the ship is reduced and the power production using waste heat is less than the ship's power requirement, the ship's generator is supplied to supply power. At this time, when the amount of insufficient power is less than the generator capacity, the generator efficiency is lowered.

Embodiments of the present invention are to provide a waste heat supply system and a ship comprising the same to smoothly supply the waste heat energy required for power generation.

Embodiments of the present invention to provide a waste heat supply system and a ship including the same that can constantly supply the waste heat energy for power generation despite the change in the engine output.

The objects of the present invention are not limited thereto, and other objects not mentioned can be clearly understood by those skilled in the art from the following description.

According to one aspect of the invention, an engine exhaust system comprising a liquefied natural gas storage tank, an engine and a first exhaust line for exhausting the exhaust gas of the engine, exhaust of the gas combustion unit and the gas combustion unit connected to the liquefied natural gas storage tank A ship comprising a gas combustion unit exhaust system comprising a second exhaust line for discharging gas and a waste heat recovery system for generating power using the exhaust gas of the engine and the exhaust gas of the gas combustion unit.

In addition, the exhaust gas of the gas combustion unit may supply heat energy to the exhaust gas of the engine, and the exhaust gas of the engine supplied with the heat energy of the exhaust gas of the gas combustion unit may supply heat energy to the waste heat recovery system.

The apparatus may further include a first heat exchanger connected to the first exhaust line to supply thermal energy to the waste heat recovery system, and the second exhaust line may be connected to the first exhaust line in front of the first heat exchanger.

The apparatus further includes a first heat exchanger connected to the first exhaust line to supply thermal energy to the waste heat recovery system and a second heat exchanger connected to the first exhaust line in front of the first heat exchanger, the second heat exchanger being in the second exhaust line. The exhaust gas of the flowing gas combustion unit and the exhaust gas of the engine flowing in the first exhaust line may be connected to the second exhaust line to heat exchange.

In addition, a first heat exchanger connected to the first exhaust line to supply thermal energy to the waste heat recovery system, a second heat exchanger connected to the first exhaust line in front of the first heat exchanger, a third heat exchanger connected to the second exhaust line, and The apparatus may further include a heat exchange line connecting the second heat exchanger and the third heat exchanger.

In addition, the second exhaust line is a first line which is connected so that the exhaust gas of the gas processing unit is in heat exchange with the exhaust gas of the engine, a second line where the exhaust gas of the gas processing unit is discharged directly from the gas processing unit to the outside, and the first line And a second valve connected to the second line and the second valve connected to the second line, the vessel may further include a control unit for controlling the opening or closing rate of the first valve and the second valve according to the amount of power generated by the vessel.

According to another aspect of the invention, a first exhaust system for exhausting the exhaust gas of the first combustion apparatus through the first exhaust line, a second exhaust system and the first exhaust system through the second exhaust line for exhausting the exhaust gas of the second combustion apparatus; And a heat exchange system for exchanging heat with the exhaust gas flowing in the exhaust line or the exhaust gas flowing in the second exhaust line, wherein the thermal energy of the second exhaust system is provided to be supplied to the first exhaust system.

The heat exchange system also includes a first heat exchanger connected to the first exhaust line, and the second exhaust line may be connected to the first exhaust line in front of the first heat exchanger.

The heat exchange system also includes a first heat exchanger connected to the first exhaust line and a second heat exchanger connected to the first exhaust line in front of the first heat exchanger, the second heat exchanger flowing in the second exhaust line. And exhaust gas of the first combustion device flowing in the first exhaust line may be connected to the second exhaust line to exchange heat.

In addition, the heat exchange system includes a first heat exchanger connected to the first exhaust line, a second heat exchanger connected to the first exhaust line in front of the first heat exchanger, a third heat exchanger connected to the second exhaust line, and a second heat exchanger and third It may include a heat exchange line connecting the heat exchanger.

In addition, the second exhaust line may include a first line which is connected such that the exhaust gas of the second combustion device is in heat exchange with the exhaust gas of the first combustion device, and the exhaust gas of the second combustion device is discharged directly to the outside from the first combustion device. And a second valve connected to the second line, a first valve connected to the first line, and a second valve connected to the second line, wherein the waste heat supply system may further include a control unit for controlling the opening and closing rate of the first valve and the second valve. have.

The first combustion device may also be an engine, and the first exhaust system may be an engine exhaust system that exhausts the exhaust gas of the engine through the first exhaust line.

Further, the second combustion device may be a gas combustion unit that burns vapor gas (BOG) of liquefied natural gas, and the second exhaust system may be a gas combustion device exhaust system that exhausts the exhaust gas of the gas combustion unit through the second exhaust line. have.

Embodiments of the present invention can be smoothly supplied to the waste heat energy for power generation in the vessel.

Embodiments of the present invention can constantly supply waste heat energy despite variations in engine power.

1 is a view showing a vessel having a waste heat supply system according to an embodiment of the present invention.
2 is a view showing a first embodiment of the waste heat supply system of FIG.
3 is a view showing a second embodiment of the waste heat supply system of FIG.
4 is a view showing a third embodiment of the waste heat supply system of FIG.
5 is a view showing a fourth embodiment of the waste heat supply system of FIG.

Hereinafter, a Rankine cycle system according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

1 is a view showing a vessel having a waste heat supply system according to an embodiment of the present invention.

Referring to FIG. 1, the vessel 1 includes a liquefied natural gas storage tank 10, a waste heat supply system 100, and a waste heat recovery system 200.

 The liquefied natural gas storage tank 10 stores liquefied natural gas (Liquefied Natural Gas, LNG) in a liquid state. The liquefied natural gas stored in the liquefied natural gas storage tank 10 is evaporated by an external heat source. Hereinafter, the liquefied natural gas evaporated is referred to as a boiled off gas (BOG).

The waste heat supply system 100 supplies thermal energy to the waste heat recovery system 200. The waste heat supply system 100 includes a first exhaust system 110, a second exhaust system 120, and a heat exchange system 130.

The first exhaust system 110 discharges the exhaust gas of the first combustion device. According to one example, the first combustion device may be an engine and the first exhaust system may be an engine exhaust system.

The second exhaust system 120 exhausts the exhaust gas of the second combustion device. According to one example, the second combustion device may be a gas combustion unit (GCU), and the second exhaust system may be a gas combustion unit exhaust system.

The heat exchanger 130 allows heat exchange between the fluid flowing through the first exhaust system 110, the second exhaust system 120, and / or the waste heat recovery system 200. According to an example, the heat exchanger 130 may exchange heat between the fluid flowing in the first exhaust system 110 and the fluid flowing in the waste heat recovery system 200. In addition, the heat exchange system 130 may exchange heat between the fluid flowing in the first exhaust system 110 and the fluid flowing in the second exhaust system 120.

The exhaust gas of the second combustion device flowing in the second exhaust system 1200 supplies thermal energy to the exhaust gas of the first combustion device flowing in the first exhaust system 1100.

The waste heat recovery system 200 produces mechanical energy and / or electrical energy using energy of waste heat supplied from the waste heat supply system 100. According to one example, the waste heat recovery system 200 may be a turbine or a Rankine cycle system.

The vessel 1 may smoothly produce power required in the vessel by supplying heat energy of the exhaust gas flowing through the plurality of exhaust systems 110 and 120 to the waste heat recovery system 200.

2 is a view showing a first embodiment of the waste heat supply system of FIG.

2, the waste heat supply system 1000 includes an engine exhaust system 1100, a gas combustion unit exhaust system 1200, a first heat exchanger 1310, a second heat exchanger 1320, and a third heat exchanger ( 1330 and heat exchange line 1340.

Engine exhaust system 1100 includes a first exhaust line 1120. The first exhaust line 1120 is connected to the engine 1110 to discharge the exhaust gas of the engine 1110. According to one example, the engine 1110 may be a low speed two stroke diesel engine, a dual fuel engine or a high pressure gas injection engine.

Gas combustion unit exhaust system 1200 includes a gas combustion unit 1210 and a second exhaust line 1220. The gas combustion unit 1210 is connected to the liquefied natural gas storage tank 10 to combust the boil-off gas BOG discharged from the liquefied natural gas storage tank 10. The second exhaust line 1220 is connected to the gas combustion unit 1210 to discharge the combustion gas of the gas combustion unit 1210.

The first heat exchanger 1310 is connected to the first exhaust line 1120. The first heat exchanger 1310 includes a heat supply line 1312. The fluid discharged to the first exhaust line 1120 supplies thermal energy to an external heat source fluid introduced into the heat supply line 1312.

The second heat exchanger 1320 is connected to the first exhaust line 1120 in front of the first heat exchanger 1310. The third heat exchanger 1330 is connected to the second exhaust line 1220. The third heat exchanger 1330 is connected to the second heat exchanger 1320 through the heat exchange line 1340. The heat transfer fluid flowing in the heat exchange line 1340 transmits thermal energy supplied from the exhaust gas of the gas combustion unit 1210 flowing in the second exhaust line 1220 to the exhaust gas of the engine 1110 flowing in the first exhaust line 1120. To pass.

In the waste heat supply system 1000 having the above configuration, the heat energy of the exhaust gas of the gas combustion unit 1210 flowing in the second exhaust line 1220 is transferred to the second heat exchanger 1320 and the third heat exchanger 1330. The exhaust gas of the engine 1110 flows in the first exhaust line 1120 through the flowing heat transfer fluid. The exhaust gas of the engine 1110, which receives the thermal energy of the exhaust gas of the gas combustion unit 1210, supplies thermal energy to an external heat source fluid through the first heat exchanger 1310.

3 is a view showing a second embodiment of the waste heat supply system of FIG.

Referring to FIG. 3, the waste heat supply system 2000 includes an engine exhaust system 2100, a gas combustion unit exhaust system 2200, a first heat exchanger 2310, and a second heat exchanger 2320.

The engine exhaust system 2100 of the waste heat supply system 2000, the gas combustion unit exhaust system 2200, and the first heat exchanger 2310 may include the engine exhaust system 1100 and the gas combustion of the waste heat supply system 1000 of FIG. 1. The unit exhaust system 1200 and the first heat exchanger 1310 are provided in a similar configuration.

The second heat exchanger 2320 is connected to the first exhaust line 2120 in front of the first heat exchanger 2310. The second heat exchanger 2320 is connected to the second exhaust line 2220 such that the exhaust gas of the engine 2100 flowing in the first exhaust line 2120 and the exhaust gas of the gas combustion unit 2210 exchange heat. Accordingly, the exhaust gas of the engine 2100 flowing in the first exhaust line 2120 receives thermal energy from the exhaust gas of the gas combustion unit 2210 flowing along the second exhaust line 2220.

The waste heat supply system 2000 having the above configuration supplies the thermal energy of the exhaust gas of the gas combustion unit 2210 to the exhaust gas of the engine 2110 through the second heat exchanger 2320, and supplies the gas combustion unit 2210. The exhaust gas of the engine 2110, which receives the thermal energy of the exhaust gas of), supplies energy to an external heat source fluid through the first heat exchanger 2310.

4 is a view showing a third embodiment of the waste heat supply system of FIG.

Referring to FIG. 4, the waste heat supply system 3000 includes an engine exhaust system 3100, a gas combustion unit exhaust system 3200, and a first heat exchanger 3310.

The engine exhaust system 3100 of the waste heat supply system 3000, the gas combustion unit exhaust system 3200, and the first heat exchanger 3310 may include the engine exhaust system 1100 and the gas combustion of the waste heat supply system 1000 of FIG. 2. The unit exhaust system 1200 and the first heat exchanger 1310 are provided in a similar configuration.

The second exhaust line 3220 is directly connected to the first exhaust line 3120 in front of the first heat exchanger 3310. The exhaust gas of the gas combustion unit 3210 discharged to the second exhaust line 3220 is combined with the exhaust gas of the engine 3110 and passes through the first heat exchanger 3310 along the first exhaust line 3120.

In the waste heat supply system 3000 having the above configuration, after the exhaust gas of the gas combustion unit 3210 and the exhaust gas of the engine 3110 are combined, each heat energy is transferred to an external heat source through the first heat exchanger 3310. Supply directly to the fluid.

The waste heat supply system (1000, 2000, 3000) is a gas combustion unit (1120, 2120, By continuously supplying the exhaust gas of 3120, it is possible to produce enough power for the vessel.

5 is a view showing a first embodiment of the waste heat supply system of FIG.

Referring to FIG. 5, the waste heat supply system 4000 includes an engine exhaust system 4100, a gas combustion unit exhaust system 4200, a first heat exchanger 4310, a second heat exchanger 4320, and a third heat exchanger ( 4330, a heat exchange line 4340, and a controller 4400.

 The engine exhaust system 4100 of the waste heat supply system 4000, the gas combustion unit exhaust system 4200, the first heat exchanger 4310, the second heat exchanger 4320, the third heat exchanger 4330, and the heat exchange line ( 4340 may include an engine exhaust system 1100, a gas combustion unit exhaust system 1200, a first heat exchanger 1310, a second heat exchanger 1320, a third heat exchanger 1330, and a heat exchange line 1340 of FIG. 2. It is provided in a configuration similar to).

However, the second exhaust line 4220 of the gas combustion unit exhaust system 4200 includes a first line 4222, a second line 4224, a first valve 4230, and a second valve 4240.

The first line 4222 is connected to the gas combustion unit 4210 to discharge the exhaust gas of the gas combustion unit 4210 to the outside.

The second line 4224 is branched from the first line 4222 to provide heat exchange between the exhaust gas of the gas combustion unit 4210 and the exhaust gas of the engine 4110.

The first valve 4230 is installed in the first line 4222, and the second valve 4240 is installed in the second line 4224.

The controller 4400 adjusts the opening or closing rate of the first valve 4230 or the second valve 4240 by measuring a power generation amount of the vessel. The amount of power generated by the ship depends on the output of the engine 4110, the displacement or the operating situation of the ship.

According to an example, the first valve 4230 and the second valve 4240 may be on / off valves. When the amount of power generated by the vessel is less than the amount of power required in the vessel, the controller 4400 closes the first valve 4230 and opens the second valve 4240. In addition, when the amount of power generated by the vessel is greater than the amount of power required in the vessel, the controller 4400 opens the first valve 4230. In addition, when the amount of power generated by the vessel is excessive compared to the amount of power demanded by the vessel, the controller 4400 opens the first valve 4230 and closes the second valve 4240.

According to another example, the first valve 4230 and the second valve 4240 may be a flow control valve. The controller 4400 adjusts the opening ratio of the first valve 4230 or the second valve 4240 according to the amount of exhaust gas discharged from the engine or the amount of power required for the vessel.

The waste heat supply system 4000 having the above configuration may adjust the amount of exhaust gas of the gas combustion unit 4210 flowing in the second line 4422 of the second exhaust line 4220. Thus, it is possible to constantly produce power regardless of the engine output of the vessel.

The second exhaust line 4220 and the controller 4400 of FIG. 5 may be equally applied to the waste heat supply system of FIGS. 3 and 4.

In the above embodiments, it will be described that the first exhaust system is the engine exhaust system and the second exhaust system is the gas combustion unit exhaust system. However, the present invention is not limited thereto, and at least one of the first exhaust system and the second exhaust system may be an exhaust system of another type of combustion device.

In addition, the above-described embodiments provide a vessel having a waste heat supply system. However, the present invention is not limited thereto, and the waste heat supply system of the above-described embodiments may be applied to other kinds of prime movers.

The foregoing description is merely illustrative of the technical idea of the present invention, and various changes and modifications may be made by those skilled in the art without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are intended to illustrate rather than limit the scope of the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The protection scope of the present invention should be interpreted by the following claims, and all technical ideas within the equivalent scope should be interpreted as being included in the scope of the present invention.

1 ship
1000 to 4000 waste heat supply system
1100-4100 engine exhaust system
1110 to 4110 engine
1120 to 4120 first exhaust line
1200 to 4200 gas combustion unit exhaust system
1210 to 3210 gas combustion unit
1220-4220 Second Exhaust Line
1310 to 4310 first heat exchanger
2320 to 4320 second heat exchanger
3330 third heat exchanger 3340 heat exchange line
4222 First Line 4224 Second Line
4230 First Valve 4240 Second Valve

Claims (13)

Liquefied natural gas storage tanks;
An engine exhaust system comprising an engine and a first exhaust line for exhausting the exhaust gas of the engine;
A gas combustion unit exhaust system comprising a gas combustion unit connected to the liquefied natural gas storage tank and a second exhaust line for exhausting the exhaust gas of the gas combustion unit;
A waste heat recovery system for generating electric power using exhaust gas of the engine and exhaust gas of the gas combustion unit; And
And a control unit controlling the gas combustion unit exhaust system.
The second exhaust line is
A first line connected with the exhaust gas of the gas processing unit to exchange heat with the exhaust gas of the engine;
A second line through which the exhaust gas of the gas processing unit is discharged directly from the gas processing unit to the outside;
A first valve connected to the first line; And
A second valve connected to the second line,
The control unit controls the opening or closing rate of the first valve and the second valve in accordance with the amount of power generation of the vessel. The method of claim 1,
The exhaust gas of the gas combustion unit supplies thermal energy to the exhaust gas of the engine,
A ship in which the exhaust gas of the engine supplied with the thermal energy of the exhaust gas of the gas combustion unit supplies thermal energy to the waste heat recovery system. Liquefied natural gas storage tanks;
An engine exhaust system comprising an engine and a first exhaust line for exhausting the exhaust gas of the engine;
A gas combustion unit exhaust system comprising a gas combustion unit connected to the liquefied natural gas storage tank and a second exhaust line for exhausting the exhaust gas of the gas combustion unit;
A waste heat recovery system for generating electric power using exhaust gas of the engine and exhaust gas of the gas combustion unit; And
A first heat exchanger connected to the first exhaust line to supply thermal energy to the waste heat recovery system,
The second exhaust line is connected to the first exhaust line in front of the first heat exchanger,
The exhaust gas of the gas combustion unit supplies thermal energy to the exhaust gas of the engine,
A ship in which the exhaust gas of the engine supplied with the thermal energy of the exhaust gas of the gas combustion unit supplies thermal energy to the waste heat recovery system. Liquefied natural gas storage tanks;
An engine exhaust system comprising an engine and a first exhaust line for exhausting the exhaust gas of the engine;
A gas combustion unit exhaust system comprising a gas combustion unit connected to the liquefied natural gas storage tank and a second exhaust line for exhausting the exhaust gas of the gas combustion unit;
A waste heat recovery system for generating electric power using exhaust gas of the engine and exhaust gas of the gas combustion unit;
A first heat exchanger connected to the first exhaust line to supply thermal energy to the waste heat recovery system; And
A second heat exchanger connected to the first exhaust line in front of the first heat exchanger,
The second heat exchanger is connected to the second exhaust line such that the exhaust gas of the gas combustion unit flowing in the second exhaust line and the exhaust gas of the engine flowing in the first exhaust line exchange heat;
The exhaust gas of the gas combustion unit supplies thermal energy to the exhaust gas of the engine,
A ship in which the exhaust gas of the engine supplied with the thermal energy of the exhaust gas of the gas combustion unit supplies thermal energy to the waste heat recovery system. Liquefied natural gas storage tanks;
An engine exhaust system comprising an engine and a first exhaust line for exhausting the exhaust gas of the engine;
A gas combustion unit exhaust system comprising a gas combustion unit connected to the liquefied natural gas storage tank and a second exhaust line for exhausting the exhaust gas of the gas combustion unit;
A waste heat recovery system for generating electric power using exhaust gas of the engine and exhaust gas of the gas combustion unit;
A first heat exchanger connected to the first exhaust line to supply thermal energy to the waste heat recovery system;
A second heat exchanger connected to the first exhaust line in front of the first heat exchanger;
A third heat exchanger connected to the second exhaust line; And
A heat exchange line connecting the second heat exchanger and the third heat exchanger,
The exhaust gas of the gas combustion unit supplies thermal energy to the exhaust gas of the engine,
A ship in which the exhaust gas of the engine supplied with the thermal energy of the exhaust gas of the gas combustion unit supplies thermal energy to the waste heat recovery system. The method according to claim 3 or 4,
The second exhaust line is
A first line connected with the exhaust gas of the gas processing unit to exchange heat with the exhaust gas of the engine;
A second line through which the exhaust gas of the gas processing unit is discharged directly from the gas processing unit to the outside;
A first valve connected to the first line; And
A second valve connected to the second line,
The vessel further includes a control unit for controlling the opening or closing rate of the first valve and the second valve in accordance with the amount of power generated by the vessel. A first exhaust system for exhausting the exhaust gas of the first combustion device through the first exhaust line;
A second exhaust system through a second exhaust line for exhausting exhaust gas of the second combustion device; And
It includes a heat exchange system for heat exchange with the exhaust gas flowing in the first exhaust line or the exhaust gas flowing in the second exhaust line,
And the heat energy of the second exhaust system is provided to be supplied to the first exhaust system. The method of claim 7, wherein
The heat exchanger system includes a first heat exchanger connected to the first exhaust line,
And the second exhaust line is connected to the first exhaust line in front of the first heat exchanger. The method of claim 7, wherein
The heat exchange system includes a first heat exchanger connected to the first exhaust line; And
A second heat exchanger connected to the first exhaust line in front of the first heat exchanger,
And the second heat exchanger is connected to the second exhaust line such that the exhaust gas of the second combustion apparatus flowing in the second exhaust line and the exhaust gas of the first combustion apparatus flowing in the first exhaust line exchange heat. The method of claim 7, wherein
The heat exchange system includes a first heat exchanger connected to the first exhaust line;
A second heat exchanger connected to the first exhaust line in front of the first heat exchanger;
A third heat exchanger connected to the second exhaust line; And
Waste heat supply system including a heat exchange line connecting the second heat exchanger and the third heat exchanger. The method of claim 7, wherein
The second exhaust line is
A first line connected with the exhaust gas of the second combustion device to exchange heat with the exhaust gas of the first combustion device;
A second line through which the exhaust gas of the second combustion device is discharged directly from the first combustion device to the outside;
A first valve connected to the first line; And
A second valve connected to the second line,
The waste heat supply system further comprises a control unit for controlling the opening and closing rate of the first valve and the second valve. 12. The method according to any one of claims 7 to 11,
The first combustion device is an engine,
And the first exhaust system is an engine exhaust system for exhausting the exhaust gas of the engine through the first exhaust line. 13. The method of claim 12,
The second combustion device is a gas combustion unit that burns vapor gas (BOG) of liquefied natural gas,
And said second exhaust system is a gas combustion apparatus exhaust system for exhausting exhaust gas of a gas combustion unit through a second exhaust line.

Images