KR101400022B1 - Apparatus for Recycling Waste Heat for offshore Structure - Google Patents

Abstract

A waste heat recovery apparatus for a marine structure is disclosed.
The apparatus for recovering waste heat of a marine structure according to an embodiment of the present invention includes a first heat absorbing unit that absorbs heat as the engine is driven, a fresh water supplied from the fresh water supplying unit and heat- A second heat absorber to which the heat medium of the boiler is supplied and which exchanges heat between the heat generated by the driving of the engine and the heat medium and transfers the heat exchanged heat medium to the boiler, A third heat absorber for heat-exchanging heat generated by driving of the engine with the heat medium, a second heat absorber provided between the boiler and the third heat absorber, the heat medium being supplied from the first heat absorber to the third heat absorber, A first valve for controlling the flow rate of the heat medium or the flow rate of the heat medium supplied from the boiler to the third heat absorbing portion, And a waste heat supply unit to which a sieve is supplied.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a waste heat recovery apparatus for an offshore structure,

The present invention relates to a waste heat recovery apparatus for a marine structure, and more particularly, to a waste heat recovery apparatus for a marine structure for recovering waste heat generated in an engine to enhance energy efficiency of a marine structure.

Generally, a marine structure such as a ship is designed to operate a marine structure by a driving force generated by operating an engine, and supplies power to a marine structure through a generator equipped with a turbine.

Various attempts have been made to efficiently reuse the exhaust gas generated from the engine as an energy source having a high-temperature heat source, without discharging it as it is.

Particularly, in a ship using an Organic Rankine Cycle (ORC) as a working fluid, the working fluid can recover waste heat through heat exchange with the exhaust gas discharged from the engine.

1 is a schematic view showing an organic Rankine cycle provided in a conventional vessel.

1, after the working fluid is expanded in the turbine 30 via the evaporator 2, the working fluid in the condenser 40 is condensed and moved to the working fluid supply pump 60, ). ≪ / RTI >

In addition, the evaporator 20 is supplied with circulating water heated to a predetermined temperature through the heat exchanger 3, and the circulating water and the working fluid are heat-exchanged in the evaporator to increase the temperature of the working fluid.

Then, the heat-exchanged circulating water is circulated to the heat exchanger (3) via the air cooler (5) by the circulating water supply pump (4).

Korean Patent Publication No. 10-2012-0060423 Korean Patent Publication No. 10-2010-0067247

The present invention is to provide a waste heat recovery apparatus for a marine structure that stably supplies a heat source necessary for an organic Rankine cycle, prevents low-temperature corrosion problems in a heat exchanger, and efficiently utilizes energy in a marine structure.

According to one aspect of the present invention, there is provided a boiler comprising: a first heat absorbing portion that absorbs heat as the engine is driven; a boiler in which fresh water supplied from a fresh water supplying portion is mixed with a heat- A second heat absorbing unit for heat-exchanging heat generated by the driving of the engine with the heat medium and transferring the heat-exchanged heat medium to the boiler, a heating medium of the boiler is supplied, A third heat absorber for heat-exchanging the heat with the heat medium, a flow rate of the heat medium supplied from the first heat absorber to the third heat absorber, or a flow rate of the heat medium supplied from the boiler to the third heat absorber, A first valve for controlling the flow rate of the heat medium supplied to the third heat absorbing portion, and a waste heat supplying portion for supplying the heat medium exchanged in the third heat absorbing portion, A waste heat recovery apparatus for a marine structure can be provided.

Further, the boiler may further include a pressurizing pump for pressurizing the heating medium between the boiler and the third heat absorbing part.

The first heat absorbing portion, the second heat absorbing portion or the third heat absorbing portion may be any one of an economizer, an air cooler, a jacket cooler, or an oil cooler.

In addition, the boiler can supply the vapor-phase heat medium supplied from the second heat absorber to the steam application site.

In addition, the first valve can control the flow rate so as to prevent corrosion due to the low temperature of the third heat absorbing portion.

In addition, a circulation pump may be further included between the second heat absorbing part and the boiler.

The apparatus may further include a bypass line branched between the third heat absorbing portion and the waste heat supplying portion and connected to the first heat absorbing portion and a bypass valve provided in the bypass line.

The apparatus may further include a pressure reducer installed on the bypass line.

The first heat absorbing portion may further include a second valve connected to the waste heat supplying portion such that the heat medium is circulated.

The apparatus may further include an expansion tank unit installed between the third heat absorbing unit and the waste heat supply unit and supplying the heating medium to prevent cavitation of the heating medium.

The apparatus for recovering waste heat of a marine structure according to an embodiment of the present invention includes a third heat absorber to recover heat generated by driving the engine together with the first heat absorber and the second heat absorber in multiple stages have.

In addition, since the heat medium absorbing various heat sources generated by driving the engine is mixed in the boiler, the heat source required for the waste heat supply unit can be stably secured.

Further, by controlling the temperature of the heating medium through the control of the first valve, it is possible to prevent the third heat absorbing part from being corroded due to the low temperature.

1 is a schematic view showing an organic Rankine cycle provided in a conventional vessel.
2 is a schematic view showing a waste heat recovery apparatus for a marine structure according to an embodiment of the present invention.
3 is a schematic view showing an alternative embodiment of Fig.
4 is a view for explaining a waste heat recovery method according to the waste heat recovery apparatus of the marine structure shown in FIG.
5 is a schematic view showing an apparatus for recovering waste heat of a marine structure according to another embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. It is to be understood, however, that the appended drawings illustrate the present invention in order to more easily explain the present invention, and the scope of the present invention is not limited thereto. You will know.

In describing the embodiments of the present invention, it is to be noted that components having the same function are denoted by the same names and the same symbols, but substantially not identical to those of the conventional waste heat recovery apparatus.

Also, the terms used in the present application are used only to describe certain embodiments and are not intended to limit the present invention. The singular expressions include plural expressions unless the context clearly dictates otherwise. In the present application, the terms "comprises" or "having" and the like are used to specify that there is a feature, a number, a step, an operation, an element, a component or a combination thereof described in the specification, But do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or combinations thereof.

2 is a schematic view showing a waste heat recovery apparatus for a marine structure according to an embodiment of the present invention.

2, a waste heat recovery apparatus 103 of a marine structure according to an embodiment of the present invention includes a first heat absorbing unit 250, a boiler 300, a second heat absorbing unit 210, A first valve 400, and a waste heat supply unit 500. The first valve 400 and the waste heat supply unit 500 may include an absorber 220, a first valve 400,

The first heat absorbing part 250, the second heat absorbing part 210 or the third heat absorbing part 220 can absorb heat generated by the driving of the engine 10.

The first heat absorbing part 250, the second heat absorbing part 210 or the third heat absorbing part 220 may be any one of an economizer, an air cooler, a jacket cooler, and an oil cooler.

The economizer is generally a heat exchanger that recovers the heat of the exhaust gas discharged from the engine.

Further, the air cooler may be a device for lowering the temperature of the gas supplied to the engine, that is, the scavenging gas.

The jacket cooler is a device for cooling the heat of the engine itself.

Further, the oil cooler is a device for cooling the heat of the oil used in the engine.

The heating medium may be water purified from seawater. However, the heating medium is not limited to water, and fluids which can be transported by absorbing heat can also be applied.

The boiler 300 may mix the heat medium that has been heat-exchanged in the first heat absorbing part 250 and fresh water supplied from the fresh water supplying part 110.

The fresh water supply unit 110 may include a fresh water storage tank for storing seawater and clean water for making seawater fresh water.

The heating medium is heat-exchanged in the first heat absorbing part 250 through the first heat absorbing part line 111 and fresh water is supplied through the fresh water supplying line 112 to the boiler 300.

The temperature of the heating medium heat-exchanged in the first heat absorbing part 250 may be, for example, in the range of about 100 to 180 ° C.

In addition, the temperature of fresh water supplied from the fresh water supply unit 110 may be, for example, about 80 캜. In other words, the temperature of the heating medium heat-exchanged in the first heat absorbing part 250 may be higher than the temperature of fresh water supplied from the fresh water supplying part 110. However, the temperature or the temperature range described above or below is a numerical value described to explain an operation example of a waste heat recovery apparatus for a marine structure according to an embodiment of the present invention, and the technical idea of the present invention is not limited thereto Temperature, or temperature range.

As shown, the first heat absorber line 111 is connected to the fresh water supply line 112 and may be transferred while the heating medium and the fresh water are mixed before reaching the boiler 300.

3, the first heat absorber line 111 may be connected to the boiler 300 separately from the fresh water supply line 112.

Accordingly, the boiler 300 can primarily recover the heat generated by the driving of the engine 10.

The second heat absorbing part 210 is supplied with the heat medium of the boiler 300 and exchanges heat generated by the driving of the engine 10 with the heat medium and transfers the heat exchanged heat medium to the boiler 300 .

The second heat absorbing part 210 is supplied with the heating medium of the boiler 300 through the first supply line 212.

The heating medium, which is heat-exchanged with the exhaust gas of the engine, is supplied to the boiler 300 through the second supply line 214 in the second heat absorbing part 210.

The waste heat recovery apparatus 103 of the marine structure according to the embodiment of the present invention may further include a circulation pump 230 between the second heat absorption unit 210 and the boiler 300.

The circulation pump 230 may be installed in the first supply line 212 to circulate the heating medium from the boiler 300 to the second heat absorbing part 210.

Meanwhile, the boiler 300 can supply a vapor-phase heat medium, that is, steam, supplied from the second heat absorber 210 to the steam applicator 20.

The heating medium in the gaseous state may be transferred to the steam application source 20 through the steam supply line 302 connected to the upper portion of the boiler 300.

That is, the boiler 300 can produce steam used in the sea structure by using various heat generated by the engine 10.

The third heat absorbing part 220 is supplied with the heat medium of the boiler 300 and can recover heat from the heat generated by the driving of the engine 10. [

Also, as described above, the third heat absorbing part 220 may be an air cooler for cooling the scavenging gas supplied to the engine 10.

As described above, the waste heat recovering apparatus 103 of the marine structure according to the present embodiment includes the third heat absorbing part 220 which can further recover the heat remaining in the exhaust gas that has passed through the second heat absorbing part 210, The energy efficiency of the marine structure can be increased.

The first valve (400) may be installed between the boiler (300) and the third heat absorbing part (220). That is, the first valve 400 may be installed in a third supply line 401 connecting the boiler 300 and the third heat absorbing part 220.

The first valve 400 is connected to the first heat absorbing sub branch line 114 branched from the first heat absorbing sub line 111.

Accordingly, the first valve (400) may be supplied with the heating medium from the first heat absorbing part (250) to the third heat absorbing part (220).

The first valve 400 controls the flow rate of the heat medium supplied from the first heat absorbing part 250 to the third heat absorbing part 220 or the flow rate of the heat medium supplied from the boiler 300 to the third heat absorbing part 220 Can be controlled.

Accordingly, the first valve 400 controls the temperature of the heating medium supplied to the third heat absorbing part 220, and the temperature of the heating medium supplied to the third heat absorbing part 220 It is possible to prevent the third heat absorbing part 220 from being corroded.

Here, the low temperature means a temperature at which corrosion occurs due to the heating medium supplied to the heat exchanger.

The temperature of the heating medium supplied to the third heat absorber 220 may be, for example, about 120 ° C. However, the present invention is not limited to this and may be a temperature that can prevent corrosion caused by the material or size of the third heat absorbing part 220.

In addition, a temperature sensor 403 may be included to measure the temperature of the heating medium passing through the first valve 400.

When the temperature of the heating medium in the third supply line 401 is not 120 ° C, for example, the temperature sensor 403 transmits a signal to the first valve 400, . That is, when the heating medium is supplied to the third heat absorbing part 220, the operation of the first valve 400 may be controlled to control the temperature of the heating medium in order to prevent corrosion of the third heat absorbing part 220 .

The clean water supply line 112 may further include a fresh water branch line 302 discharged from the boiler 300 and connected to the fresh water supply line 112.

Accordingly, if the temperature of the heat medium discharged from the boiler 300 drops rapidly, the water can be supplied to the boiler 300 through the fresh water branch line 302.

As described above, the waste heat recovering apparatus 103 of the marine structure according to the present embodiment can regulate the temperature of the heating medium for recovering heat to the third heat absorbing part 220, and the temperature of the third heat absorbing part 220 It is possible to prevent a malfunction or a failure.

The waste heat supply part 500 can be supplied with the heating medium from the third heat absorption part 220.

The waste heat supply unit 500 may be an organic Rankine Cycle (ORC) apparatus.

Also, the waste heat supply unit 500 can generate electric power using the supplied heat medium.

The temperature of the heating medium supplied to the waste heat supply unit 500 may be, for example, 160 ° C. Accordingly, the temperature of the heating medium supplied to the waste heat supply unit 500 may be a temperature at which the waste heat supply unit 500 is operated to maximize the amount of electric power generated.

In addition, the heating medium having a predetermined temperature is transferred to the waste heat supply unit 500 to produce stable electric power.

Meanwhile, the apparatus for recovering waste heat of a marine structure 100 according to an embodiment of the present invention includes a first valve 400 and a third heat absorbing unit 220 installed between the first valve 400 and the third heat absorbing unit 220, (312).

The pressurizing pump 312 can pressurize the heating medium conveyed to the third heat absorbing part 2202 through the third supply line 401 connected to the lower part of the boiler 300. [

Accordingly, the pressure pump 312 can increase the pressure of the heating medium and smoothly transfer the heating medium.

In addition, the pressurizing pump 312 can prevent cavitation from occurring in the transferring medium.

The waste heat recovery device 103 of the marine structure according to the present embodiment is installed between the third heat absorption part 220 and the waste heat supply part 500 and supplies the heating medium to prevent cavitation of the heating medium And may further include an extension tank portion 224.

Accordingly, the expansion tank 224 prevents cavitation of the heating medium with the pressurizing pump 312, thereby reducing a pressure change of the heating medium being transferred.

The waste heat recovering apparatus 103 of the marine structure according to the present embodiment is branched between the third heat absorbing part 220 and the waste heat supplying part 500 and connected to the first heat absorbing part 250 A bypass line 502 and a bypass valve 504 provided in the bypass line 502.

The bypass line 502 branches from the first waste heat supply line 222 and is connected to the first heat absorbing part 250.

The bypass valve 504 is installed at a connection point between the first waste heat supply line 222 and the bypass line 502.

The bypass valve 504 may transfer the heat medium from the third heat absorbing part 220 to the waste heat supplying part 500 or may selectively transfer the heat medium to the first heat absorbing part 250 .

Accordingly, when the waste heat supply unit 500 fails, the heat transferring unit can transfer the heat medium through the bypass line 502 to prevent heat from being transferred to the waste heat supply unit 500.

In addition, the waste heat recovery apparatus 103 of the marine structure according to the present embodiment may further include a pressure reducer 506 installed in the bypass line 502.

The pressure reducer 506 may lower the pressure of the heating medium via the bypass line 502.

Accordingly, the pressure reducer 506 can lower the pressure of the heating medium pressurized by the pressurizing pump 224, thereby cooling the heating medium.

That is, when the waste heat supply unit 500 fails, the temperature of the heat medium is lowered by using the pressure reducer 506 installed in the bypass line 502, thereby preventing the temperature of the entire waste heat recovery apparatus from being increased can do.

4 is a view for explaining a waste heat recovery method according to the waste heat recovery apparatus of the marine structure shown in FIG.

4, the fresh water is discharged from the fresh water supply unit 110 and transferred to the boiler 300 through the fresh water supply line 112. [ - ①

The heat medium from which the heat of the engine is recovered is discharged from the first heat absorbing part 250 and transferred to the boiler 300 through the first heat absorbing part line 111. - ②

On the other hand, the first heat absorbing part line 111 is connected to the fresh water supplying line 112, so that the fresh water and the heating medium are mixed and transported. -③

The heating medium transferred to the boiler 300 is transferred to the second heat absorber 210 through the first supply line 212. The circulation pump 230 installed in the first supply line 212 transfers the heat medium from the first supply line 212 to the second heat absorption unit 210. The heating medium, which is heat-exchanged with the exhaust gas of the engine in the second heat absorbing portion 210, is supplied to the boiler 300 through the second supply line 214 while the liquid and the gas are mixed. - ④

The heating medium of the boiler 300 is transferred to the first valve 400 provided with the third supply line 401. - ⑤

The heating medium, which is heat-exchanged in the first heat absorbing part 250, is transferred to the first valve 400. - ⑥

The first valve 400 mixes the heating medium of the boiler 300 and the heating medium of the first heat absorbing part 250 so that the temperature of the mixed heating medium may be 120 ° C., Can be controlled.

The heating medium is transferred from the first valve (400) to the third heat absorbing part (220). - ⑦

That is, the heating medium supplied to the boiler 300 is heat-exchanged in the third heat absorbing part 220 and then supplied to the waste heat supplying part 500 through the first waste heat supplying part line 222. -8

Meanwhile, the heating medium supplied to the boiler 300 in a gaseous state is transferred to the steam use place 20 through the steam supply line 302. -9

The heat-exchanged heat medium in the waste heat supply part 500 is transferred to the first heat absorbing part 250 through the second waste heat supplying part line 310. -10

As described above, the waste heat recovery apparatus 103 of the marine structure according to the present embodiment can receive various heat sources generated in the engine 10 through the boiler 300, thereby enhancing the energy efficiency.

Further, by receiving and discharging various heat sources through the boiler 300, the temperature change of the heating medium supplied to the waste heat supply part 500 can be reduced, and the stability of the entire apparatus can be enhanced.

When the waste heat supply part 500 malfunctions or fails, the heat medium is not supplied to the waste heat supply part 500 by operating the bypass valve 504, And is transferred to the first heat absorbing part 250. -11

5 is a schematic view showing an apparatus for recovering waste heat of a marine structure according to another embodiment of the present invention.

As shown, the waste heat recovery apparatus 104 of a marine structure according to another embodiment of the present invention is similar to the waste heat recovery apparatus 103 of the marine structure of FIG. 2 described above, The description of which will be omitted.

5, the first heat absorbing part 250 applied to the waste heat recovering device 104 of a marine structure according to another embodiment of the present invention is connected to the waste heat supplying part 500 to circulate the heat medium, do.

The waste heat recovery apparatus 104 of the marine structure according to the present embodiment further includes a waste heat circulation line 115 branched from the first heat absorber line 111 and connected to the first waste heat supply line 222 .

A second valve 116 is installed at a branch point between the first heat absorbing part line 111 and the waste heat circulating line 115.

The second valve 116 may control the heating medium that is heat-exchanged in the first heat absorbing unit 250 to be supplied to the boiler 300, the first valve 400, or the waste heat supplying unit 500.

As described above, in the waste heat recovering apparatus 104 of the marine structure according to another embodiment of the present invention, the first heat absorbing part 250 and the waste heat supplying part 500 are connected to circulate, When the temperature of the heat-exchanged heat medium in the first heat exchanger 250 corresponds to about 160 ° C, the heat-exchanged heat medium may be transferred to the waste heat supplying unit 500 through the control of the second valve 116.

It will be understood by those skilled in the art that various changes and modifications may be made without departing from the scope of the present invention as defined by the appended claims, It is obvious.

110: fresh water supply part
210: second heat absorbing portion
220: third heat absorbing portion
250: first heat absorbing portion
300: Boiler
400: first valve
500: waste heat supply part

Claims (10)

A first heat absorber for absorbing heat generated by driving the engine;
A boiler in which a heat medium that has been heat-exchanged in the first heat absorbing portion and fresh water supplied from the fresh water supplying portion are mixed;
A second heat absorber supplied with the heat medium of the boiler and performing heat exchange between heat generated by driving the engine and the heat medium and transferring the heat exchanged heat medium to the boiler;
A third heat absorber supplied with the heat medium of the boiler and performing heat exchange between the heat generated by the driving of the engine and the heat medium;
A flow rate of the heat medium supplied from the first heat absorbing portion to the third heat absorbing portion or a flow rate of the heat medium supplied from the boiler to the third heat absorbing portion, A first valve for controlling the first valve; And
The heat-absorbing material is supplied to the heat-
And a waste heat recovery device for recovering waste heat of the marine structure. The method according to claim 1,
And a pressurizing pump for pressurizing the heating medium between the boiler and the third heat absorbing unit. The method according to claim 1,
The first heat absorbing part, the second heat absorbing part or the third heat absorbing part
An air cooler, a jacket cooler, or an oil cooler. The method according to claim 1,
The boiler
And supplies the gaseous heat medium supplied from the second heat absorber to the steam use place. The method according to claim 1,
The first valve
And the flow rate of the third heat absorbing part is controlled so as to prevent corrosion due to low temperature. The method according to claim 1,
And a circulation pump between the second heat absorbing part and the boiler. The method according to claim 1,
A bypass line branched between the third heat absorbing portion and the waste heat supplying portion and connected to the first heat absorbing portion; And
And a bypass valve installed in the bypass line. 8. The method of claim 7,
And a decompressor installed in the bypass line. The method according to claim 1,
Wherein the first heat absorbing portion is connected to the waste heat supplying portion so that the heat medium is circulated. The method according to claim 1,
Further comprising an expansion tank portion provided between the third heat absorbing portion and the waste heat supplying portion and supplying a heating medium to prevent cavitation of the heating medium.

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