KR101830481B1 - Waste Heat Recovery System - Google Patents

Waste Heat Recovery System Download PDF

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Publication number
KR101830481B1
KR101830481B1 KR1020150163646A KR20150163646A KR101830481B1 KR 101830481 B1 KR101830481 B1 KR 101830481B1 KR 1020150163646 A KR1020150163646 A KR 1020150163646A KR 20150163646 A KR20150163646 A KR 20150163646A KR 101830481 B1 KR101830481 B1 KR 101830481B1
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South Korea
Prior art keywords
supply line
water supply
heating water
heat exchanger
hot water
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KR1020150163646A
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Korean (ko)
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KR20170059562A (en
Inventor
박강호
김영기
장현수
선종길
Original Assignee
주식회사 코와
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H9/00—Details
    • F24H9/0005—Details for water heaters
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H1/00—Water heaters, e.g. boilers, continuous-flow heaters or water-storage heaters
    • F24H1/0072—Special adaptations
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H1/00—Water heaters, e.g. boilers, continuous-flow heaters or water-storage heaters
    • F24H1/48—Water heaters for central heating incorporating heaters for domestic water
    • F24H1/52—Water heaters for central heating incorporating heaters for domestic water incorporating heat exchangers for domestic water
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H9/00—Details
    • F24H9/0005—Details for water heaters
    • F24H9/001—Guiding means
    • F24H9/0015—Guiding means in water channels
    • F24H9/0021—Sleeves surrounding heating elements or heating pipes, e.g. pipes filled with heat transfer fluid, for guiding heated liquid

Abstract

The present invention relates to an exhaust heat recovery heat exchanger having an exhaust heat recovery heat exchanger that can be used individually or simultaneously at the time of use of hot water and at the time of using hot water through an exhaust heat recovery heat exchanger for recovering a heat source of exhaust gas discharged from a boiler, To a boiler system.
The present invention includes a main body portion (21); The main body 21 has a second cleavage of the heat exchange tubes are arranged so that the internal heat exchanger unit provided with at least one respective connection as feed water line and a heating and hot water supply line to the unit 24 and; (25) (26) in which a heating water connection pipe and a hot water connection pipe are respectively formed while independently partitioning the heating water supply line and the hot water supply line at the upper and lower sides of the front face of the unit heat exchanging part A heat recovery heat exchanger is provided.
The present invention also relates to an exhaust heat recovery system comprising: an exhaust heat recovery heat exchanger (20) provided at one side of a boiler (10) to exhaust exhaust gas generated from a boiler (10) A heating water supply line (30) (32) connected to pass the heating water through the exhaust heat exchanger (20); And a heating water supply line 34 connected to the heating water supply line 30 so that the heating water passing through the boiler 10 is taken out and heated so that the heating water supply line 30 is connected to the boiler 10 The heating water supply line 32 in which the arrangement is recovered while passing through the arrangement recovery heat exchanger 20 is connected to the boiler 10 And is connected to the heating water discharge line (34) without being directly connected to the heating water discharge line (34).
The present invention also relates to an exhaust heat recovery system comprising: an exhaust heat recovery heat exchanger (20) provided at one side of a boiler (10) to exhaust exhaust gas generated from a boiler (10) A heating water supply line (30) (32) connected to pass the heating water through the exhaust heat exchanger (20); And a heating water supply line (34) connected to the heating water supply line (30) so as to circulate the heating water passing through the boiler (10)
The heating water supply line 30 is provided with a branch supply line 31 for supplying a part of the heating water to the inside of the boiler 10 and is connected to the heating water supply line 31 through the arrangement recovery heat exchanger 20, The supply line 32 is connected directly to the heating water outlet line 34 without being directly connected to the boiler 10 and is passed through the arrangement recovery heat exchanger 20 to the arrangement recovery heat exchanger 20 Hot water supply lines 50 and 52 are formed and the hot water supply line 52 through which the hot water whose arrangement is recovered through the arrangement recovering heat exchanger 20 is moved allows hot water heated from the boiler 10 to flow out The hot water is bypassed to one side of the hot water supply line 50 connected to the hot water outlet line 54 to be connected to the hot water outlet heat exchanger 20 so as to be supplied into the boiler 10 A hot water branch supply line 51 is formed There is provided a boiler system having an exhaust heat recovery heat exchanger.

Figure 112015113668308-pat00001

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a boiler system having an exhaust heat recovery unit, an exhaust heat recovery unit,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a boiler system including an exhaust heat recovery heat exchanger and an exhaust heat recovery heat exchanger. More particularly, the present invention relates to an exhaust heat recovery heat exchanger for recovering a heat source of exhaust gas discharged from a boiler, They can be used individually or simultaneously at the time of use.

BACKGROUND ART Generally, in a gas or oil boiler, a conventional exhaust heat recovery heat exchanger has a structure in which a separate exhaust heat recovery heat exchanger is provided for each of heating and hot water. In order to increase the efficiency of heating mainly used, an exhaust heat recovery heat exchanger Respectively.

1, an exhaust heat recovering heat exchanger 20 is provided on one side of a boiler 10, and exhaust gas generated from a boiler 10 is exhausted through the exhaust heat recovery heat exchanger And is discharged to the atmosphere through the flue via the flue 20.

At this time, a heating water line for supplying the heating water circulation is formed. The heating water supply line 30 through which the heating water is supplied and passes through the arrangement recovery heat exchanger 20, and the heating water passing through the arrangement recovery heat exchanger 20, A heating water supply line 32 is formed so as to be supplied into the heating water supply pipe 10.

In addition, a heating water outlet line (not shown) is provided to allow the heating water heated and raised in the boiler 10 to be supplied to the heating unit 40 so that the heating water is discharged from the boiler 10 and connected to the heating water supply line 30, (34) is formed.

In addition, the boiler 10 is provided with a hot water inlet 12 and a hot water outlet 14.

The heating water is supplied to the inside of the boiler 10 through the heating water supply line 32 via the heat recovery water heat exchanger 20 through the heating water supply line 30, Exchanged with the heat source of the exhaust gas discharged through the boiler 10 and supplied to the inside of the boiler 10 in a heated state.

The heating water that has been heated to a required temperature in the boiler 10 is circulated through the heating water supply line 30 through the heating water supply unit 40 for heating through the heating water supply water line 34.

As described above, conventionally, when the hot water is used, the arrangement is recovered while passing through the heat recovery heat exchanger 20 only when the hot water is used.

In the conventional heating system, there is a problem that the pressure loss of the circulating water increases. In addition to the conventional heat exchanger in the boiler, the pressure loss in the piping is increased by the additional heat recovery heat exchanger, In addition, the design and application of the heat exchanger are also limited.

In addition, the efficiency of the hot water is lowered. The exhaust heat recovering heat exchanger recovers the heat of the exhaust gas discharged through the hearth as heating water or hot water to reduce the energy consumption of the entire boiler, thereby increasing the efficiency. There is a problem in that the arrangement heat recovery heat exchanger is installed on the hot water side because the cost is increased and the installation area is increased. In general, the exhaust heat recovery heat exchanger is mounted and operated only in the frequently used flow path (mainly on the heating side).

However, since the arrangement is not recovered when hot water is actually used, there is a disadvantage that the boiler efficiency is used in a state where the boiler efficiency is about 3 to 6%.

2A and 2B, the heating water supply line 30 constituting the exhaust heat recovery heat exchanger 20 is arranged in such a manner that it is inclined downward from the upper part of the exhaust heat recovery heat exchanger A structure in which the heating water and the hot water line can not be combined can not be used and the structure can not exhibit the arrangement recovery function through the heating water and the hot water line through one arrangement recovery heat exchanger structurally.

Further, conventionally, a tube made of a material having corrosion resistance, that is, a stainless steel tube is constituted because there is a risk of corrosion due to condensate generated on the outer wall of the tube constituting the supply line when manufacturing the heating water supply line constituting the exhaust heat exchanger.

However, since such a stainless steel material tube is required to be connected to a heating water supply line and a heating water supply line at an inlet portion and an outlet portion, it is generally combined through welding (TIG welding) ) Is thin, and when another tube is inserted into one tube and welded, a gap is generated and welding is difficult. Even if the welding is performed, the bonding strength may not be robust and durability may cause a problem.

Korean Patent No. 10-1404163 (public announcement date: June 4, 2014)

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems of the prior art as described above, and it is an object of the present invention to provide an exhaust heat recovery system, The boiler system including the exhaust heat recovery heat exchanger and the exhaust heat recovery heat exchanger, wherein the efficiency is improved and the cost is thereby reduced.

According to an aspect of the present invention, Of the main body while having at least one unit having therein a heating water supply line and a hot water supply line and the heat exchanger tubes 2 that are cleaved is arranged to be connected each heat exchange unit; And a shield casing in which a heating water connection pipe and a hot water connection pipe are respectively formed while independently partitioning the heating water supply line and the hot water supply line at the upper portion and the lower portion of the front face of the unit heat exchanger, respectively.

In addition, the end portion of the heat exchange tube constituting the unit heat exchanging portion forms an expanded portion, the coupling pipe is closely attached to the inside of the expanded portion, and a heating water supply line and a hot water supply line are inserted into the coupling pipe, , And is fixed.

According to another aspect of the present invention, there is provided an exhaust heat recovery apparatus comprising: an exhaust heat recovery heat exchanger provided at one side of a boiler to exhaust exhaust gas generated from a boiler to be discharged; A heating water supply line connected to pass the heating water through the exhaust heat recovery heat exchanger; And a heating water supply line connected to the heating water supply line so as to circulate the heating water so that the heating water having passed through the boiler is taken out and heated,

The heating water supply line is provided with a branch supply line for supplying a part of the heating water to the inside of the boiler. The heating water supply line through which the arrangement is recovered while passing through the arrangement recovery heat exchanger is not directly connected to the boiler, A boiler system having an exhaust heat exchanger connected to a line is provided.

Further, according to another aspect of the present invention, there is provided an exhaust heat recovery apparatus comprising: an exhaust heat recovery heat exchanger provided at one side of a boiler to exhaust exhaust gas generated from a boiler to be discharged; A heating water supply line connected to pass the heating water through the exhaust heat recovery heat exchanger; And a heating water supply line connected to the heating water supply line so as to circulate the heating water so that the heating water having passed through the boiler is taken out and heated,

The heating water supply line is provided with a branch supply line for supplying a part of the heating water to the inside of the boiler. The heating water supply line through which the arrangement is recovered while passing through the arrangement recovery heat exchanger is not directly connected to the boiler, And the hot water supply line through which the hot water, which has been arranged and collected through the arrangement recovery heat exchanger, moves from the hot water supply line to the hot water supply line which is heated from the boiler, A hot water supply line is connected to one side of the hot water supply line connected to the hot water outflow line to allow the hot water to flow into the boiler, A boiler system with an exhaust heat exchanger Is provided.

Further, the above-

A body portion; A unit heat exchanger having one or more heat exchange tubes arranged in two rows arranged to be connected to the heating water supply line and the hot water supply line, respectively; And a shield casing in which a heating water connection pipe and a hot water connection pipe are formed while independently partitioning the heating water supply line and the hot water supply line respectively at the upper portion and the lower portion of the front face of the unit heat exchanger.

In addition, the end portion of the heat exchange tube constituting the unit heat exchanging portion forms an expanded portion, the coupling pipe is closely attached to the inside of the expanded portion, and a heating water supply line and a hot water supply line are inserted into the coupling pipe, .

In addition, the coupling tube is a structure that is expanded in the expanded portion of the heat exchange tube to be closely attached thereto.

As described above, in the case of using hot water and hot water, it is possible to arrange the exhaust heat through a single heat recovery heat exchanger, thereby making it possible to constitute a boiler system with high efficiency.

Further, according to the present invention, when the heat exchange tube constituting the exhaust heat collecting heat exchanger is connected with the hot water supply line and the hot water supply line, an expansion portion is formed at the end portion of the heat exchange tube, and a separate coupling tube is inserted into the expansion portion of the heat exchange tube And the hot water supply line and the hot water supply line are inserted into the inside of the coupling pipe and welded to each other, have.

1 is a schematic view of a boiler system with a conventional batch recovery heat exchanger.
2A is a perspective view of an exhaust heat recovery heat exchanger provided in the exhaust heat recovery apparatus.
2B is a front view of FIG. 2A.
3 is a schematic diagram of a boiler system with an exhaust heat recovery heat exchanger according to one embodiment of the present invention.
4 is a schematic diagram of a boiler system with an exhaust heat recovery heat exchanger according to another embodiment of the present invention.
5A is a perspective view of an exhaust heat recovery heat exchanger according to the present invention.
Fig. 5B is a front view of Fig. 5A. Fig.
6A is a perspective view of an exhaust heat recovery heat exchanger according to the present invention.
6B is a perspective view showing a state in which a plurality of heating water supply lines and a shielding casing for communicating hot water supply lines are provided in the state of FIG. 6A.
7 is a view showing a piping arrangement state of a unit heat exchanger constituting an exhaust heat recovering heat exchanger according to the present invention.
8 is an enlarged cross-sectional view of part A of Fig.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

The same reference numerals are given to the same constituent elements as those of the above-mentioned conventional art, and new constituent elements are given new numerals and explained in detail.

3 is a schematic diagram of a boiler system with an exhaust heat recovery heat exchanger according to one embodiment of the present invention.

As shown in the drawing, the boiler 10 is provided at one side thereof with an arrangement recovery heat exchanger 20, and is provided with heating water supply lines 30 and 32 and a heating water supply line 34.

According to an embodiment of the present invention, the heating water supply line 30 connected to supply the heating water to the exhaust heat recovery heat exchanger 20 is provided with a branch supply The heating water supply line 32 in which the arrangement is recovered while passing through the arrangement recovery heat exchanger 20 is connected to the heating water supply line 34 without being directly connected to the boiler 10 .

Therefore, according to the embodiment of the present invention, while the heating water passes through the arrangement recovery heat exchanger 20 through the heating water supply line 30, a part of the heating water branched through the branch supply line 31 flows into the boiler 10 so that the heating water passing through the arrangement recovery heat exchanger 20 is combined with the heating water supply line 34 via the heating water supply line 32 and supplied to the heating unit 40. [

4 is a schematic diagram of a configuration of a configuration of a configuration according to another embodiment of the present invention, in which a hot water supply line is formed in the structure shown in FIG. 3, The hot water supply line 52 is connected to the hot water outflow line 54 for allowing the hot water heated by the boiler 10 to flow out I have.

A hot water supply line 51 is formed at one side of the hot water supply line 50 so that hot water is bypassed and supplied to the inside of the boiler 10.

4, according to another embodiment of the present invention, the hot water passes through the hot water supply line 50 (52) to the batch recovery heat exchanger 20, while a part of hot water flows into the boiler 10 The hot water passing through the hot water withdrawal line 54 passes through the hot water supply line 52 because the hot water supply line 52 is connected to the hot water outflow line 54. Therefore, The hot water in the recovered state can be supplied in a warmed state by being combined with the hot water passing through the boiler 10 in the hot water outflow line 54.

As shown in FIGS. 5A and 5B, the arrangement of the heat recovery heat exchanger 20 has a technical feature that a hot water supply line and a heating water supply line are arranged together, May be individually or simultaneously arranged.

In other words, the exhaust heat recovering heat exchanger 20 according to the present invention is provided with a heating water supply line 30 or a heating water supply line 32 and a hot water supply line 50 or a hot water supply line 52, So as to form a single unit heat exchanging unit 24. As shown in FIG.

For example, when three unit heat exchangers 24 are formed, the heating water supply line 50 may be connected to the unit heat recovery heat exchanger 24, (52) and hot water supply lines (30) (32) are alternately arranged.

6A and 6B are perspective views of an exhaust heat recovery heat exchanger according to the present invention. As shown in the drawing, an exhaust heat recovery heat exchanger 20 according to the present invention includes a main body 21, An exhaust pipe 23 formed at an upper portion of the main body 21 to exhaust the exhaust gas and an exhaust pipe 23 formed at a lower portion of the main body 21, And a unit heat exchanging unit 24 for exchanging heat with the exhaust gas.

5A, the unit heat exchanging unit 24 includes a pair of support plates 24a formed at both ends thereof and a heating water supply line 30 (32 (a)) arranged between the pair of support plates 24a And hot water supply lines 50 and 52 are arranged.

A plurality of unit heat exchanging units 24 may be provided inside the main body unit 21. A plurality of heating water supply lines 30 may be provided on the upper and lower sides of one of the unit heat exchanging units 24 (32) and the hot water supply lines (50) (52) are provided so as to protrude so as not to interfere with each other.

The blocking casings 25 and 26 have a structure in which a heating water connection pipe 25a and a hot water connection pipe 26a are formed so that heating water and hot water can be supplied independently of each other.

delete

7 and 8, a heat exchange tube (not shown) connected to the heating water supply line 30 (32) or the hot water supply lines (50, 52) while constituting the unit heat exchange unit (24) And an expansion pipe 24c is formed at an end of the connection pipe 24b which is provided at the connection portion and a coupling pipe 28 formed in the pipe expansion portion 24c is inserted and expanded, (Generally TIG welding) after inserting the line 30 (32) or the hot water supply line 50 (52).

When the heat exchange tube 24b is connected to the heating water supply line 30 or 32 or the hot water supply line 50 or 52, the end portion of the heat exchange tube 24b is enlarged to form the expansion portion 24c, The connection pipe 28 is inserted into the expansion portion 24c and then is made to be in close contact with the inner surface of the expansion portion 24c in an enlarged manner through an expansion operation. In this state, the heating water supply line 30 Or the hot water supply lines 50 and 52 are inserted and welded to be combined and fixed.

Therefore, conventionally, since the heating water supply line 30 (32) is inserted and the welding is performed in a state in which the heat exchange tube 24b is not expanded, the thickness of the coupling portion is thin The thickness of the heating water supply lines 30 and 32 is 0.5 mm and the thickness of the heating water supply lines 30 and 32 is 1 mm). In addition, the gap between the heat exchange tubes 24b When the thickness of the heating water supply line 30 (32) or the hot water supply line 50 (52) and the thickness of the coupling pipe 28 in the middle are both 0.5 mm, The thickness of the portion can be made thicker as compared with the conventional one and the coupling pipe 287 is brought into close contact with the inside of the expansion portion 24c of the heat exchange tube 24b and the heating water supply line 30 or 32 or the hot water supply line 50) 52 are inserted, so that they can be more tightly engaged, The welding can be performed with good quality, so that the bonding force can be increased.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments. While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, But fall within the scope of the appended claims.

10: Boiler
12: Hot water inlet part
14: Hot water outlet
20: Sequence recovery heat exchanger
21:
22: inlet pipe
23: discharge pipe
24: Unit heat exchanger
24a:
24b: heat exchange tube
25, 26: shielding casing
25a: Heating water connector
26a: Hot water connector
28: Coupling tube
30,32: Heating water supply line
34: Heating water line
40: Heating
50,52: hot water supply line
51: Hot water supply line
54: Hot water outlet line

Claims (7)

delete delete delete An exhaust heat collecting heat exchanger (20) provided at one side of the boiler (10) to allow exhaust gas generated from the boiler (10) to pass therethrough and to be exhausted;
A heating water supply line (30) (32) connected to pass the heating water through the exhaust heat exchanger (20);
A heating water supply line 34 connected to the heating water supply line 30 so as to circulate the heating water having passed through the boiler 10 and to be heated;
/ RTI >
The heating water supply line 30 is provided with a branch supply line 31 for supplying part of the heating water to the inside of the boiler 10,
The heating water supply line 32 through which the arrangement is recovered while passing through the arrangement recovery heat exchanger 20 is not directly connected to the boiler 10 but is connected to the heating water supply line 34,
Hot water supply lines 50 and 52 are formed in the arrangement recovery heat exchanger 20 so as to be passed through the arrangement recovery heat exchanger 20 and arranged for recovery,
The hot water supply line 52 through which the hot water having been arranged and collected through the arrangement recovery heat exchanger 20 is moved is connected to the hot water outlet line 54 for allowing the hot water heated by the boiler 10 to flow out,
A hot water branch supply line 51 is formed in which the hot water is bypassed to one side of the hot water supply line 50 connected to allow the hot water to flow into the heat recovery heat exchanger 20 and supplied to the inside of the boiler 10,
The exhaust heat withdrawing heat exchanger (20)
A body portion 21;
A unit heat exchanger (24) having one or more heat exchange tubes arranged in two rows so as to be connected to the heating water supply line and the hot water supply line, respectively, in the body part (21);
A shielding casing (25) (26) having a heating water connection pipe and a hot water connection pipe formed separately at upper and lower portions of the front face of the unit heat exchange unit (24), respectively,
And a boiler system having an exhaust heat exchanger.
delete The method of claim 4,
An end of the heat exchange tube 24b constituting the unit heat exchanging part 24 forms an expansion part 24c and the coupling pipe 28 is brought into close contact with the inside of the expansion part 24c. Wherein the heating water supply line (30) (32) and the hot water supply line (50) (52) are inserted and welded and fixed in the interior of the boiler system.
The method of claim 6,
Wherein the coupling pipe (28) is expanded and provided in the expanded portion (24c) of the heat exchange tube (24b).
KR1020150163646A 2015-11-21 2015-11-21 Waste Heat Recovery System KR101830481B1 (en)

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KR102189235B1 (en) 2020-07-20 2020-12-09 주식회사 동광보일러 Saving-system boiler control method thereof and a saving-system boiler

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100750375B1 (en) 2007-04-26 2007-08-17 왕화식 Cooling or heating combined system using 2-passline waste water exchanger and heat pump
KR100940219B1 (en) * 2009-02-24 2010-02-04 (주)대성이노텍 Tube structure of helical cross setting type for heat exchanger
JP2013155904A (en) * 2012-01-27 2013-08-15 Gastar Corp Hot water storage system
JP5467038B2 (en) * 2010-12-27 2014-04-09 リンナイ株式会社 Latent heat exchanger and hot water supply device
KR101445786B1 (en) 2013-08-22 2014-10-06 린나이코리아 주식회사 boiler heat exchanger

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100750375B1 (en) 2007-04-26 2007-08-17 왕화식 Cooling or heating combined system using 2-passline waste water exchanger and heat pump
KR100940219B1 (en) * 2009-02-24 2010-02-04 (주)대성이노텍 Tube structure of helical cross setting type for heat exchanger
JP5467038B2 (en) * 2010-12-27 2014-04-09 リンナイ株式会社 Latent heat exchanger and hot water supply device
JP2013155904A (en) * 2012-01-27 2013-08-15 Gastar Corp Hot water storage system
KR101445786B1 (en) 2013-08-22 2014-10-06 린나이코리아 주식회사 boiler heat exchanger

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