KR102027905B1 - Thermoelectric generation system used for ship - Google Patents

Abstract

A thermoelectric power generation system for ships is disclosed. Marine thermoelectric power generation system according to an embodiment of the present invention includes a turbocharger for generating a high-temperature compressed air using the exhaust gas discharged from the ship engine; And an air cooler for cooling the compressed air supplied from the turbocharger, wherein the air cooler forms a first flow path through which the coolant flows to perform heat exchange between the compressed air and the coolant, and is arranged in parallel with each other. And a heat exchanger plate and a flow direction controller provided on the heat exchanger plate so that the compressed air is homogeneously flowed between the heat exchanger plates.

Description

Marine thermoelectric power generation system {THERMOELECTRIC GENERATION SYSTEM USED FOR SHIP}

The present invention relates to a thermoelectric power generation system for ships.

Recently, the necessity of developing eco-friendly ships has been highlighted by rising oil prices and tightening environmental regulations. Accordingly, various technologies have been developed to improve fuel efficiency of a ship by configuring a system for improving engine performance and recovering waste heat.

It is estimated that approximately 37.1% of the recoverable energy from the diesel engine is present in ship engines. Specifically, about 27.1% of the energy discarded into the waste pipe and 14.2% of the energy discarded by the air cooler, except for energy recovered through the waste heat recovery system (WHRS), total 37.1%. Energy can be recovered.

For example, the exhaust gas discharged from the ship engine for energy recovery drives a turbo charger, and the driven turbocharger compresses the outside air to generate high-temperature, high-pressure compressed air. The generated high temperature and high pressure compressed air may be supplied to the air cooler described above, heat exchanged with the cooling water by the air cooler to generate compressed air of low temperature and high pressure, and then supplied to the marine engine.

In addition, the exhaust gas discharged from the ship engine may be heat-exchanged with the cooling water by an exhaust gas recirculation (ECR) cooler and then cooled to be supplied to the ship engine. In this way, the emission of NOx can be reduced.

On the other hand, the compressed air discharged from the rear end of the circular turbocharger is generally diffused toward the air cooler inlet end of the square shape.

However, the air cooler is composed of a plurality of planar heat exchange plates, and the compressed air diffused therebetween is often not uniformly flow, which may cause thermal damage to the plate heat exchange plate or reduce the performance of the heat exchange. .

As a related art, refer to Korean Patent Publication No. 10-2015-0029964 (published on March 19, 2015).

Korean Patent Publication No. 10-2015-0029964 (published March 19, 2015)

An embodiment of the present invention is to provide a thermoelectric power generation system for ships to improve the performance of the heat exchange by allowing the hot compressed air to flow homogeneously between the plurality of plate-shaped heat exchanger plate flowing through the cooling water.

According to an aspect of the present invention, a turbocharger for generating hot compressed air using exhaust gas discharged from a ship engine; And an air cooler for cooling the compressed air supplied from the turbocharger, wherein the air cooler forms a first flow path through which cooling water flows to perform heat exchange between the compressed air and the cooling water, and parallel to each other. A ship thermoelectric power generation system including a plurality of plate-shaped heat exchange plates disposed therein and a flow direction controller provided on the heat exchange plate so that the compressed air flows uniformly between the heat exchange plates may be provided.

The flow direction controller may be mounted to the left and right angle adjustment on the heat exchange plate.

The flow direction regulator may have a triangular prism shape lying down in the width direction of the heat exchange plate.

The first flow path includes an inflow pipe receiving the cooling water, a discharge pipe discharging the cooling water, and a plurality of branch pipes connecting the inflow pipe and the discharge pipe, and the heat exchange plate therein. You can have more than one.

The flow direction controller forms a second flow passage through which the coolant flows, and the compressed air flows from the turbocharger between the heat exchanger plate and flows in the longitudinal direction, and the first flow passage and the second flow passage are compressed air. It can be formed transverse to the flow direction of the.

And a thermoelectric element disposed on at least one surface of the flow direction controller and the heat exchange plate, and generating electricity by a temperature difference between the cooling water and the compressed air flowing through at least one of the first flow passage and the second flow passage. can do.

The exhaust gas discharged from the ship engine is supplied to the turbocharger, the compressed air compressed by the turbocharger is transferred to the air cooler, and the compressed air cooled through the air cooler is returned to the ship engine. A first supply line for sending and a second supply line for supplying exhaust gas of the ship engine to an exhaust gas recirculation cooler and returning the exhaust gas cooled by the exhaust gas recirculation cooler to the ship engine; Can be.

Further comprising a fresh water supply line for supplying the fresh water cooled by heat exchange with sea water to the exhaust gas recirculation cooler, the exhaust gas recirculation cooler may heat-exchange the exhaust gas supplied from the vessel engine with the fresh water.

The thermoelectric power generation system for ships according to the embodiment of the present invention may improve the performance of heat exchange by allowing the hot compressed air to flow homogeneously between the plurality of plate heat exchange plates through which cooling water flows.

The effects of the present invention are not limited to the above-mentioned effects, and other effects not mentioned will be clearly understood by those skilled in the art from the description of the claims.

1 shows a thermoelectric power generation system for ships according to an embodiment of the present invention.
2 is a front view illustrating an air cooler included in the thermoelectric power generation system for ship of FIG. 1.
3 is a front view illustrating a state in which an angle of the flow direction controller mounted on the air cooler of FIG. 2 is adjusted.
Figure 4 shows a perspective view of the angle adjustment of the flow direction controller of FIG.
Figure 5 illustrates the shape of the flow path provided in the heat exchange plate of the air cooler of FIG.
6 is a cross-sectional view of the flow path inside the heat exchanger plate and the flow direction regulator of the air cooler of FIG.
FIG. 7 is a cross-sectional view illustrating another example of a flow path provided in a heat exchange plate of the air cooler of FIG. 6.
FIG. 8 illustrates a thermoelectric element provided on a surface of a heat exchange plate of the air cooler shown in FIG. 2.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. The embodiments introduced below are provided as an example to sufficiently convey the spirit of the present invention to those skilled in the art to which the present invention pertains. The present invention is not limited to the embodiments described below and may be embodied in other forms. Parts not related to the description are omitted in the drawings in order to clearly describe the present invention, in the drawings, the width, length, thickness, etc. of the components may be exaggerated for convenience. Like numbers refer to like elements throughout.

Referring to FIG. 1, a ship thermoelectric power generation system according to an exemplary embodiment of the present invention may include a turbocharger (100) and a turbocharger that generate compressed air at high temperature using exhaust gas discharged from a ship engine (E). An air cooler 200 for cooling the compressed air supplied from the (100).

In addition, the ship thermoelectric power supply system supplies the exhaust gas discharged from the ship engine (E) to the turbocharger 100, and delivers the compressed air compressed by the turbocharger 100 to the air cooler 200, the air cooler The first supply line (L1) for returning the compressed air cooled through the (200) to the ship engine (E) and the exhaust gas recirculation (ECR) cooler 300 for exhaust gas of the ship engine (E). And a second supply line L2 for returning the exhaust gas cooled by the exhaust gas recirculation cooler 300 to the ship engine E.

Specifically, the turbocharger 100 includes a turbine 102 and the compressor 104, the turbine 102 is rotated at high speed by the exhaust gas discharged from the ship engine (E). Exhaust gas passing through the turbine 102 may flow out through the tunnel 110.

The compressor 104 is driven by the rotational force of the turbine 102, and the compressor 104 compresses the outside air to produce compressed air of high temperature and high pressure.

The air cooler 200 exchanges compressed air supplied from the turbocharger 100 with cooling water. At this time, the cooling water of the air cooler 200 may include fresh water heat-exchanged with seawater supplied through the seawater supply line L4 through the cooling unit 600, and to the air cooler 200 through the circulation line L3. Circulated feed. In another example, seawater may be used directly as cooling water of the air cooler 200.

The exhaust gas of the ship engine E supplied to the exhaust gas recirculation cooler 300 is cooled by heat exchange with the cooling water of the exhaust gas recirculation cooler 300. At this time, the cooling water of the exhaust gas recirculation cooler 300 may include fresh water heat-exchanged with seawater supplied through the seawater supply line L6 through the cooling unit 700, and the exhaust gas recirculation cooler through the circulation line L5. Circulated to 300 is supplied. In another example, seawater may be directly used as cooling water of the exhaust gas recirculation cooler 300. Through the configuration including the exhaust gas recirculation cooler 300, the emission of NOx can be reduced.

Although not shown in FIG. 1, the above-described air cooler 200 and the exhaust gas recirculation cooler 300 may provide a thermoelectric element that generates electricity by a temperature difference generated during heat exchange, and the electricity produced by the thermoelectric element The battery 400 may be stored in the form of direct current electricity.

The direct current electricity supplied from the storage battery 400 may be converted into alternating current by a main switch board 500 and supplied to various electrical systems of the ship.

2 and 3, the air cooler 200 described above may be provided, for example, in a quadrangular shape. The air cooler 200 forms a first flow path R1 through which cooling water flows to perform heat exchange between the compressed air and the cooling water, and a plurality of plate-shaped heat exchange plates 210 disposed side by side and the compressed air are heat exchange plates. It includes a flow direction controller 220 provided on the heat exchange plate 210 to homogeneously flow between (210).

Here, a flow path (not shown) through which the coolant flows may also be formed in the flow direction controller 220, and the first flow path R1 in the heat exchange plate 210 is continuously connected to the flow path in the flow direction controller 220. It may be formed to be connected. At this time, the cooling water may flow along the flow path from the lower end inside the heat exchange plate 210 to the inside of the flow direction controller 220.

Flow direction controller 220 may be mounted to the left and right angle adjustment on the top of the heat exchange plate (210). This is to allow the compressed air to flow homogeneously between the plurality of heat exchange plates 210 that are vertically side by side.

In addition, the flow direction controller 220 may have a triangular prism shape lying down in the width direction of the heat exchange plate 210.

Typically, the compressed air discharged from the rear end of the circular turbocharger 100 is diffused toward the inlet end of the square air cooler 200. For example, when the amount of compressed air diffused between the first and second plate heat exchange plates is larger than the amount of compressed air diffused between the other heat exchange plates, the first and second angles may be adjusted by adjusting the angle of the flow direction controller 220. The leading end (top) spacing between the plate heat exchanger plates can be narrowed.

In addition, as illustrated in FIG. 3, all the flow direction regulators 220 are collectively inclined by an angle set based on the center point C of the air cooler 200, and the width direction of the heat exchanger plate 210 is obtained. According to the characteristics of the flow direction controller 220 having a triangular prism shape lying down as it can be to ensure that the compressed air is uniformly spread between the heat exchange plate (210).

At this time, the flow direction controller 220 is a distance away from the center point (C) of the air cooler 200 may be set to be larger the angle bent relative to the center point (C).

Referring to FIG. 4, the flow direction controller 220 may rotate in a left and right direction based on the rotation shaft 230 provided at the top of the heat exchange plate 210, and in addition to the heat exchange plate 210 in various forms such as a hinge and a gear. Can be combined and rotated. Although not shown, the rotation shaft 230 may be adjusted by the motor rotation amount.

Flow direction controller 220 may be automatically adjusted according to the flow rate of the compressed air flowing between each heat exchange plate 210 of the air cooler (200). The flow rate of the compressed air flowing between each heat exchange plate 210 may be measured by a sensor (not shown), which sensor (not shown) may be mounted on or inside each facing flow controller 220. Can be. The flow direction regulator 220 may also be applied to the exhaust gas recirculation cooler 300.

Meanwhile, referring to FIGS. 5 and 6, each of the heat exchange plates 210 described above may be provided with a plurality of first passages R1 in the lateral direction. Cooling water flowing into the inlet of each first channel R1 flows out through the outlet of each first channel R1. For the sake of understanding, only the heat exchange plate 210 is shown in FIG. 5, and in FIG. 6, the heat exchange plate 210 and the flow direction controller 220 mounted thereon are illustrated together.

For example, the first flow path R1 may be formed side by side in the lateral direction at each set height of each heat exchange plate 210, and the heat radiation fin 214 is provided along the first flow path R1 to supply the compressed air in the longitudinal direction. Heat exchange efficiency with can be improved.

Similarly, at least one second flow path R2 may be formed in the transverse direction in the flow direction controller 220 provided on each heat exchange plate 210.

The cooling water flowing into the inlet of the second channel R2 separate from the first channel R1 flows out through the outlet of the second channel R2.

As such, the compressed air is diffused from the turbocharger 100 between each heat exchange plate 210 to flow in the longitudinal direction, and the first flow passage R1 and the second flow passage R2 are transverse to the flow direction of the compressed air. Is formed in the direction to achieve efficient heat exchange.

Referring to FIG. 7, the first flow path R1 described above connects the inlet pipe 211 receiving the cooling water, the discharge pipe 212 discharging the cooling water, and the inlet pipe 211 and the discharge pipe 212. It may be provided in the form including a plurality of branch pipes (213).

The inlet pipe 211 and the discharge pipe 212 are arranged side by side in the horizontal direction at a predetermined interval, the branch pipe 213 connects between the inlet pipe 211 and the discharge pipe 212, and the predetermined interval side by side in the longitudinal direction Can be placed and placed. Each heat exchange plate 210 may be provided with a plurality of first passages (R1) of this type therein.

Referring to FIG. 8, for example, a thermoelectric device 240 may be provided on a surface of a heat exchange plate 210 having a plurality of first flow paths R1 having the shape illustrated in FIG. 7 described above to generate electricity. The thermoelectric element 240 generates electricity by the temperature difference between the cooling water flowing through the first flow path R1 inside the heat exchange plate 210 and the compressed air heat exchanged therewith.

The thermoelectric element 240 may be arranged on the surface of the flow direction controller 220 described above to produce electricity. In this case, the thermoelectric element 240 generates electricity by the temperature difference between the cooling water flowing through the second flow path R2 inside the flow direction controller 220 and the compressed air heat exchanged thereto.

The electricity produced by the thermoelectric element 240 may be stored in the form of direct current in the storage battery 400 shown in FIG. 1, converted into alternating current by the main switch board 500, and supplied to various electrical systems of the ship. Can be.

In the above, specific embodiments have been illustrated and described. However, the present invention is not limited only to the above-described embodiments, and those skilled in the art to which the present invention pertains can variously change variously without departing from the gist of the technical idea of the invention described in the claims below. Could be.

100: turbocharger 200: air cooler
210: heat exchange plate 211: inlet pipe
212: discharge pipe 213: branch pipe
240: thermoelectric element 300: exhaust gas recirculation cooler
L1: first supply line L2: second supply line
L3: Fresh water supply line R1, R2: Euro

Claims (8)

A turbocharger for generating hot compressed air using exhaust gas discharged from a ship engine; And
And an air cooler for cooling the compressed air supplied from the turbocharger.
The air cooler,
Forming a first flow path through which cooling water flows to perform heat exchange between the compressed air and the cooling water, and a plurality of plate heat exchange plates arranged side by side;
And a flow direction controller provided on the heat exchange plate so that the compressed air flows homogeneously between the heat exchange plates.
The flow direction regulator forms a second flow path through which the coolant flows,
At least one surface of the flow direction controller and the heat exchange plate, the thermoelectric power generation system for ships provided with a thermoelectric element for generating electricity by the temperature difference between the coolant flowing through at least one of the first passage and the second passage and the compressed air . The method of claim 1,
The flow direction controller is a thermoelectric power generation system for ships which is mounted to the left and right angle adjustment on the heat exchange plate. The method of claim 1,
The flow direction regulator is a thermoelectric power generation system for a ship having a triangular prism shape lying in the width direction of the heat exchange plate. The method of claim 1,
The first passage and the inlet pipe receiving the cooling water,
A discharge pipe for discharging the cooling water;
It includes a plurality of branch pipes connecting between the inlet pipe and the discharge pipe,
The heat exchange plate has a vessel thermoelectric power generation system having at least one first passage therein. The method of claim 1,
The compressed air flows from the turbocharger between the heat exchanger plate and flows in a longitudinal direction,
And the first flow passage and the second flow passage are formed transverse to the flow direction of the compressed air. delete The method according to any one of claims 1 to 5,
The exhaust gas discharged from the ship engine is supplied to the turbocharger, the compressed air compressed by the turbocharger is transferred to the air cooler, and the compressed air cooled through the air cooler is returned to the ship engine. The first supply line to send,
And a second supply line for supplying exhaust gas of the ship engine to an exhaust gas recirculation cooler and returning the exhaust gas cooled by the exhaust gas recirculation cooler to the ship engine. The method of claim 7, wherein
Further comprising a fresh water supply line for supplying the fresh water cooled by heat exchange with sea water to the exhaust gas recirculation cooler,
The exhaust gas recirculation cooler is a thermoelectric power generation system for a ship to heat exchange the exhaust gas supplied from the ship engine with the fresh water.

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