KR20160015945A - High efficiency environmental-friendly sensible heat exchanger - Google Patents

High efficiency environmental-friendly sensible heat exchanger Download PDF

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Publication number
KR20160015945A
KR20160015945A KR1020140098970A KR20140098970A KR20160015945A KR 20160015945 A KR20160015945 A KR 20160015945A KR 1020140098970 A KR1020140098970 A KR 1020140098970A KR 20140098970 A KR20140098970 A KR 20140098970A KR 20160015945 A KR20160015945 A KR 20160015945A
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South Korea
Prior art keywords
heat exchanger
side plate
tube
heat exchange
stainless steel
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KR1020140098970A
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Korean (ko)
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최성환
신연철
김태영
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(주)귀뚜라미
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Priority to KR1020140098970A priority Critical patent/KR20160015945A/en
Priority to PCT/KR2014/011579 priority patent/WO2016017864A1/en
Publication of KR20160015945A publication Critical patent/KR20160015945A/en

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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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D7/00—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
    • F28D7/16—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being arranged in parallel spaced relation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F9/00—Casings; Header boxes; Auxiliary supports for elements; Auxiliary members within casings

Abstract

The present invention relates to a high-efficiency and environmentally friendly sensible heat exchanger and, more specifically, to a high-efficiency and environmentally friendly sensible heat exchanger which reduces the generation of toxic substances, such as carbon monoxide, by gradually decreasing the temperature of combustion gas passing through the heat exchanger by improving the structure of the heat exchanger, and improves heat exchange efficiency between high-temperature combustion gas and low-temperature water. The high-efficiency and environmentally friendly sensible heat exchanger comprises: a heat exchanger body of which the top and bottom are opened; multiple carbon monoxide reduction pipes which reduce the generation of toxic substances by preventing a sudden decrease in the temperature of combustion gas; circular U-shaped stainless pipes which connect the ends of the adjacent carbon monoxide reduction pipes to each other; main heat exchange pipes which are arranged under the carbon monoxide reduction pipes; oval U-shaped stainless pipe which connect the opened ends of the main heat exchange pipes to each other; and front and rear oval stainless pipes which are directly exposed to a combustion gas path inside the heat exchanger body.

Description

[0001] The present invention relates to a high efficiency environmental-friendly sensible heat exchanger,

The present invention relates to a high-efficiency environment-friendly sensible heat exchanger, and more particularly, to a high-efficiency environment-friendly sensible heat exchanger capable of reducing the temperature of a combustion gas passing through a heat exchanger by improving the structure of a heat exchanger, reducing the generation of harmful substances such as carbon monoxide The present invention relates to a high-efficiency environment-friendly sensible heat exchanger having a high heat exchange efficiency between low temperature and direct water.

The heat exchanger makes heat transfer by crossing the heating fluid and the heating fluid having different temperatures from each other, and is widely used for heating, air conditioning, power generation, cooling and waste heat recovery in various heating and cooling apparatuses including a boiler and an air conditioner. Is used.

Particularly, the condensing boiler disclosed in Korean Patent No. 0390521 includes a sensible heat exchanger 1 and a latent heat exchanger 2 arranged in order below the burner 8 as shown in FIGS. 1 and 2, and a burner 8 and a sensible heat A combustion chamber corresponding to the flame generation length is provided between the exchanger (1).

In the sensible heat exchanger 1, the sensible heat exchange is performed between the flame and the combustion gas generated by burning the fuel by the burner 8 and the low-temperature direct water. In the latent heat exchanger 2, latent heat exchange .

However, since the heat contained in the high-temperature combustion gas is rapidly recovered through the sensible heat exchange pipe 9 and the heat exchange fin of the sensible heat exchanger 1 which are in contact with the combustion chamber in the past, the sensible heat exchanger 1 ) The internal temperature gradient drops sharply.

That is, when the flame generated at the burner 8 and the high-temperature combustion gas pass through the sensible heat exchanger 1, heat is rapidly taken away by the heat exchange pin 3 of the sensible heat exchange pipe 9, and the temperature rapidly falls.

Therefore, since the combustion gas including the CO and the like at a high concentration immediately after combustion is freezing rapidly by the heat exchange fin 3, the CO does not give a sufficient time for the chemical reaction to the CO 2. Therefore, A lot of material is included.

In the case of a burner having a relatively high flow rate as compared with a conventional burner that ejects a freely propagating frame such as a premix gas burner, the residence time of CO is shortened, It happens.

Therefore, immediately after the combustion gas is introduced into the sensible heat exchanger (1) directly contacting the combustion chamber, heat exchange is immediately performed from the upstream side through the sensible heat exchange pipe (9) and the heat exchange fin (3) There is a problem.

In the conventional sensible heat exchanger 1 as described above, the heat exchanger body is overheated by the high-temperature flame and the combustion gas generated in the burner 8. When the heat exchanger body is overheated, the sensible heat exchanger 1 is deformed There is a problem that a failure occurs.

As shown in FIG. 3, the applicant of the present invention has the heat exchanger body 110 and the second heat exchange tube 130 in the Korean Patent Laid-Open Publication No. 2014-0051760, and the heat exchange fin is removed from the second heat exchange tube 130. In addition, the second heat exchange tube 130 is disposed at the center of the heat exchanger body 110 with respect to the height of the body.

Accordingly, the heat exchange rate is lowered by the second heat exchange tube 130 without the heat exchange fin, so that the temperature of the combustion gas is gradually lowered. After the combustion gas flows into the second heat exchange tube 130, heat exchange Thereby reducing the emission of CO and the like.

A first heat exchange tube 120 is disposed below the second heat exchange tube 130 and a heat exchange fin is attached to the surface of the first heat exchanger 130 to allow the second heat exchange tube 130 ) To make up for inadequate heat exchange.

In addition, since the third heat exchange tube 140 disposed at the upper portion of the second heat exchange tube 130 along the inner circumferential surface of the heat exchanger body 110 prevents deformation or breakage of the heat exchanger due to overheating, So that the heat exchange rate can be increased together with the heat exchanger 120.

In addition, by fixing the contact tube 111 having a circular cross section on the front and rear surfaces of the heat exchanger body 110 by the brazing welding method, the heat exchange rate can be increased while preventing deformation or breakage of the heat exchanger due to overheating.

However, according to the related art, the generation of harmful substances can be reduced to some extent by the second heat exchange tube 130. However, by the third heat exchange tube 140 located at the uppermost portion of the heat exchanger body 110 There is a problem that rapid heat exchange occurs in the upstream.

In addition, since a large amount of solid phase radiation occurs in the process of contacting the combustion gas with the third heat exchange tube 140 immediately after the combustion gas is discharged from the combustion chamber, the heat exchange is abruptly performed, and the temperature gradient of the combustion gas can not be gently controlled.

In this case, it is possible to reduce the generation of toxic substances. On the other hand, since the first heat exchanger 120 alone can not provide a sufficient heat exchange rate, the thermal efficiency is too low . In other words, it can not simultaneously achieve the two purposes of suppressing the generation of harmful substances and high efficiency.

The contact tubes 111 may be welded to the front and rear surfaces of the heat exchanger body 110 by brazing so as to increase the thermal efficiency to some extent. There is a problem that the increase is insufficient.

Since the installation height of the contact tube 111 is the same as or higher than that of the second heat exchange tube 130 as shown in the drawing, There is a problem of rapid change.

Disclosure of Invention Technical Problem [6] The present invention has been proposed in order to solve the above-mentioned problems, and it is an object of the present invention to provide a method and apparatus for reducing the temperature of combustion gas passing through a heat exchanger, A high efficiency eco-friendly sensible heat exchanger with high efficiency.

To this end, the high-efficiency environment-friendly sensible heat exchanger according to the present invention is surrounded by a front side plate, a rear side plate, a left side plate, and a right side plate, and the upper and lower portions are opened to discharge the high- A heat exchanger body; A plurality of CO reduction pipes which are sandwiched between the left side plate and the right side plate and located at an intermediate portion with respect to the height direction of the heat exchanger body to prevent the temperature of the combustion gas from being drastically reduced, ; A stainless circular U-shaped tube which is coupled to the outside of the left side plate and the right side plate and connects open ends of the CO reduction pipes disposed adjacent to each other; Wherein the CO reduction pipe is disposed at a lower portion of the CO reduction pipe and is located relatively far from the flame as compared with the CO reduction pipe and is sandwiched between the left side plate and the right side plate respectively and the main heat exchange A tube; A stainless elliptic U-tube coupled to the outside of the left side plate and the right side plate and connecting open ends of the adjacent main heat exchange tubes to each other; And the inner surface of the front side plate (F) and the rear side plate (B) so as to prevent the solid phase radiation of the combustion gas from being directly exposed on the combustion gas flow path inside the heat exchanger body, And a front and rear stainless steel elliptical tube made of stainless steel having an elliptical cross section.

At this time, the front side plate and the rear side plate are respectively formed with an assembly groove in which the front and rear stainless steel elliptic tubes are seated, and the front and rear stainless steel elliptical tubes are seated in the assembling recesses, brazed and welded to the front side plate and the rear side plate It is preferable that it is fixed.

The front and rear stainless steel elliptical tubes are provided at two positions on the front side plate and the rear side plate. The first front and rear stainless steel elliptical tubes at a relatively low position are lower than the CO reduction pipe and higher than the main heat exchanger tube And the second front and rear stainless steel elliptical pipes disposed at a relatively high position are disposed at positions higher than the CO reduction pipe.

The inlet port through which low-temperature direct water flows is provided in a main heat exchange pipe corresponding to the inlet side of the plurality of main heat exchange tubes disposed at the lower portion of the heat exchanger body, and hot water having a temperature raised through heat exchange is discharged And the outlet port is installed in a second front and rear stainless steel elliptical pipe corresponding to the discharge side among a plurality of second front and rear stainless steel elliptical pipes arranged on the upper part of the heat exchanger body.

Also, it is preferable that the main heat exchange tube is a tube having an elliptical cross section, and the stainless elliptical U-shaped tube is a tube having a elliptical cross section and a U-shaped tube.

Further, the plurality of CO reduction pipes are arranged in parallel to each other in the horizontal direction of the heat exchanger body, and an intermediate portion of the heat exchanger body, in which the CO reduction pipes are installed, It is preferable that the upper limit is 20% of the total height and the lower limit is 20% of the total height.

The present invention adopts CO reduction pipes, main heat exchange tubes and front and rear stainless steel elliptical tubes for different purposes and optimizes their arrangement. Accordingly, the temperature of the combustion gas is lowered gently to reduce the generation of toxic substances, and the heat exchange efficiency between the combustion gas and the combustion gas is enhanced.

Further, in the present invention, the CO reducing pipe and the main heat exchanger tube are installed inside the heat exchanger body, and the inner side of the heat exchanger body is supported by the front and rear stainless steel elliptical tubes brazed at this time. Therefore, deformation of the heat exchanger due to overheating is prevented.

1 is a partial perspective view of a condensing boiler according to the prior art.
2 is a cross-sectional view of a conventional condensing boiler.
3 is a perspective view of a sensible heat exchanger according to the prior art.
4 is a perspective view illustrating a high-efficiency environment-friendly sensible heat exchanger according to the present invention.
5 is a front view and an AA sectional view of a high efficiency environmentally friendly sensible heat exchanger according to the present invention.
6 is a bottom view of a highly efficient environmentally friendly sensible heat exchanger according to the present invention.
FIG. 7 is a graph showing distance-to-hazardous material generation amount from the flame.
8 is a comparative view showing a heat conduction state of a tube having a circular section and a tube having an elliptical section.
FIG. 9 is a graph showing the temperature of the outer wall surface of the heat exchanger body according to the present invention. FIG.

Hereinafter, a high-efficiency environment-friendly sensible heat exchanger according to a preferred embodiment of the present invention will be described with reference to the accompanying drawings.

In the following description, the direction in which the burner is installed is set to the upper side and the opposite side is set to the lower side, but it is obvious that the vertical direction can be changed depending on the installation position of the burner.

In the following description, the body of the heat exchanger is divided into the front / rear / left / right side plates, but it is obvious that the front / rear / left / right directions can be changed depending on the viewing angle.

4A and 4B, the highly efficient environmentally friendly sensible heat exchanger according to the present invention includes a heat exchanger body 210, a CO reduction pipe 220, a main heat exchange pipe 230, and front and rear stainless steel elliptical And a pipe 240.

And a stainless elliptic U-shaped pipe 231 connecting a plurality of stainless steel U-shaped pipes 221 and a plurality of main heat exchange pipes 230 for connecting the CO reduction pipes 220 to each other.

The CO reduction pipe 220 and the main heat exchange pipe 230 and the front and rear stainless steel elliptical pipe 240 are connected to each other so as to allow continuous circulation of water through the plurality of connectors C1 to C4 .

The water flowing through the inlet IN flows through both the CO reduction pipe 220 and the main heat exchange pipe 230 and the front and rear stainless steel elliptical pipe 240 And then discharged through the outlet OUT.

In addition, the upper and lower portions of the heat exchanger body 210 are opened, so that the flame and the high-temperature combustion gas (i.e., heat source) provided in the upper portion of the heat exchanger body 210 pass through the heat exchanger body 210 from the upper side to the lower side Flow.

Therefore, heat is exchanged between the low temperature direct heat source and the high temperature heat source passing through both the CO reduction pipe 220, the main heat exchange pipe 230, and the front and rear stainless steel elliptic pipe 240, and the water is heated. The heated water is provided as hot water or heating water.

In particular, as described below, the present invention employs and optimizes the placement of the CO reduction pipe 220, the main heat exchange pipe 230, and the front and rear stainless steel elliptical pipe 240 for different purposes. Therefore, the generation of harmful substances is reduced and the heat exchange efficiency between the combustion gas and the combustion gas is enhanced.

The CO reducing pipe 220 and the main heat exchanging pipe 230 are installed inside the heat exchanger body 210 and the front and rear stainless steel elliptical pipes 240 welded to the front and rear surfaces of the heat exchanger body 210 And supports the inner side. Therefore, deformation and damage of the sensible heat exchanger due to overheating are prevented.

More specifically, the heat exchanger body 210 constitutes the body of a sensible heat exchanger (also referred to as a 'primary heat exchanger') and includes a front side plate F, a rear side plate B, a left side plate L and a right side plate R).

The upper and lower portions of the heat exchanger body 210 are respectively opened so that the high-temperature combustion gas introduced from the upper combustion chamber (see FIG. 2) is discharged downward. A premix gas burner sprays flames and combustion gases into the combustion chamber described above.

For example, the condensing burner has a premixed gas burner, a combustion chamber, a sensible heat exchanger, a latent heat exchanger, and a discharge portion from the upper portion thereof. The heat exchanger body 210 of the present invention relates to a sensible heat exchanger.

The heat exchanger body 210 of the present invention is connected to a premixed gas burner with a combustion chamber therebetween, similar to a conventional condensing boiler. Also, the height of the combustion chamber generally corresponds to the flame generation length of the burner, so that the burner and the heat exchanger body 210 are spaced apart by the flame generation length.

Next, the CO reducing pipe 220 prevents freezing of the high-temperature combustion gas discharged through the burner and the combustion chamber to increase the discharge amount of harmful substances such as CO and NOx, .

The CO reduction pipe 220 is made of a straight tube having a circular section in order to provide a low heat exchange rate. On the outer circumference thereof, there is no heat exchange fin unlike a general heat exchange tube.

That is, the main heat exchanger tube 230 as described later is formed of a straight tube having an oval cross section in order to provide a high heat exchange ratio, and the heat exchanger fin 230a is provided on the outer circumferential surface thereof.

The CO reduction pipe 220 is formed of a plurality of pipes and is sandwiched between a left side plate L and a right side plate R of the heat exchanger body 210, respectively. As shown in Fig. 5B, which is a sectional view taken along the line A-A in Fig. 5A, through-holes are formed in the left side plate L and the right side plate R, respectively.

Therefore, both side ends of the CO reduction pipe 220 are inserted and fixed between the left side plate L and the right side plate R so as to be connected to the through holes. Adjacent ones of the plurality of CO reduction pipes 220 are connected to each other by a stainless circular U-shaped pipe 221.

Particularly, the CO reduction pipes 220 of the present invention are arranged in parallel in the horizontal direction inside the heat exchanger body 210. At this time, since the CO reduction pipes 220 are positioned at the middle portion with respect to the height direction of the heat exchanger body 210, To prevent a sudden decrease in temperature.

An intermediate portion of the heat exchanger body 210 in which the CO reducing pipe 220 is installed has a height of 20% with respect to the total height as the upper side with respect to the center of the heat exchanger body 210 in the height direction, % ≪ / RTI >

The reason why the CO reduction pipes 220 are disposed at the central portion of the heat exchanger body 210 is that the heat exchange is not started immediately after the high temperature combustion gas introduced through the combustion chamber of the burner flows into the heat exchanger body 210 .

For example, the combustion gas includes various types of carbon monoxide (CO). If the combustion gas is cooled by the rapid heat exchange before the chemical reaction in which CO reacts with O 2, the optimum temperature for the chemical reaction is provided The CO is released as it is.

Thus, the present invention reduces the emission of harmful substances by causing the gentle temperature gradient, that is, the temperature of the combustion gas, to be slowly lowered to the temperature at which the CO is chemically converted to CO2.

In the case of using a burner having a relatively high flow rate as compared with a conventional burner that ejects a freely propagating frame such as a premixed gas burner, the residence time of CO is shortened and the chemical reaction to CO2 occurs relatively downstream .

Therefore, the present invention prevents the generation of various harmful substances such as CO by arranging the CO reduction pipe 220 from the uppermost part to the downstream side so as to prevent heat exchange immediately after the combustion gas flows into the heat exchanger body 210 .

Next, the stainless circular U-shaped tube 221 connects the plurality of environmentally friendly heat exchanges arranged in parallel as described above, so that the introduced low-temperature direct water passes through all the CO reduction pipes 220.

The stainless circular U-shaped tube 221 is manufactured by bending a circular tube having a circular cross section. The stainless circular U-shaped tube 221 thus manufactured is coupled to the outside of the left side plate L and the right side plate R, And connects open ends of the disposed CO reduction pipe 220 to each other.

Therefore, the direct water flows in the zigzag direction as it alternately passes through the CO reduction pipe 220 and the stainless circular U-shaped pipe 221.

Next, the main heat exchange tube 230 mainly aims at heat exchange between low-temperature direct water and a heat source generated in the burner (that is, a flame and a combustion gas), thereby compensating for the low heat exchange rate of the CO reduction pipe 220 .

That is, although the CO reduction pipe 220 is basically for heat exchange, the generation of toxic substances must be reduced by a gentle temperature gradient, so that the heat exchange rate is remarkably low. Accordingly, the main heat exchange tube 230 is further provided to reduce the generation of harmful substances while increasing the heat exchange rate.

To this end, a plurality of main heat exchange tubes (230) are also disposed at the lower portion of the CO reduction pipe (220). That is, the CO contained in the combustion gas is chemically converted into CO 2, and then disposed as far as possible so as to perform full heat exchange.

5 (b), the heat exchanger body 210 is provided with through holes for the main heat exchanger tube 230 at the lower portions of the left side plate L and the right side plate R, respectively, so that the main heat exchanger tube 230 Are sandwiched between the left side plate (L) and the right side plate (R).

At this time, the main heat exchanger tube 230 is fixed by brazing using a pipe made of stainless steel for example. In particular, an oval pipe having an elliptical or oval cross-section is used to increase the heat exchange rate.

6, a heat exchange fin 230a is provided on the outer circumferential surface of the main heat exchange tube 230 to further increase the heat exchange rate. Since the surface area is greatly enlarged by the heat exchange fin 230a, the heat exchange rate with the combustion gas increases.

Next, the stainless elliptical U-shaped tube 231 connects the plurality of main heat exchanges arranged in parallel as described above, so that the introduced low-temperature direct stream passes through all the main heat exchanging tubes 230.

To this end, the stainless elliptical U-shaped tube 231 is formed by bending a tube having an elliptical cross section. The stainless elliptical U tube 231 thus manufactured is coupled to the outside of the left side plate L and the right side plate R, And the open ends of the arranged main heat exchange tubes 230 are connected to each other.

Therefore, the direct water flows in the zigzag direction as it alternately passes through the CO reduction pipe 220 and the stainless elliptical U-shaped pipe 231.

At this time, since the stainless elliptical U-shaped tube 231 uses a tube having an elliptical cross section, the pressure resistance is improved, and the U-shaped U-shaped tube 231 can withstand the high hydraulic pressure and smoothly flow the direct water.

However, it is preferable that the stainless elliptical U tube 231 is also made of a stainless steel pipe and brazed to the left side plate L and the right side plate R.

Next, the front and rear stainless steel elliptical tubes 240 replace the third heat exchanging tubes 140 and the contact tubes 111 according to the conventional art described with reference to FIG. 3, and prevent the abrupt temperature decrease of the combustion gas, And serves as a reinforcing member to prevent deformation of the base member 210.

That is, the conventional third heat exchanging tube 140 is installed on the upper part of the heat exchanger body 110 close to the combustion chamber to reduce the temperature gradient reducing effect by the second heat exchanging tube 130, Is improved by the elliptical tube (240).

In addition, since the conventional third heat exchange tube 140 is directly exposed to the combustion gas discharge passage in the heat exchanger body 110, the combustion gas contacts the third heat exchange tube 140 and the solid phase radiation is excessive, Is prevented.

Since the conventional contact tube 111 has the effect of reinforcing the heat exchanger body 210, since the tube has a circular cross section, the heat exchange rate is too low to appropriately increase the heat exchange rate together with the first heat exchanger 120 Improve what you can not do.

Since the conventional contact tube 111 is disposed at the same height as the second heat exchange tube 130, the temperature of the combustion gas is too rapid based on the contact tube 111 and the second heat exchange tube 130 The problem is reduced.

To this end, the front and rear stainless steel elliptical tubes 240 of the present invention are fixed to the inner side surfaces of the front side plate F and the rear side plate B, respectively. 5 (b), the front side plate F and the rear side plate B of the heat exchanger body 210 are provided with an assembly groove on which the front and rear stainless steel elliptical tubes 240 are seated, (240) is seated in the assembly groove and then brazed.

Further, the front and rear stainless steel elliptical tube 240 is made of stainless steel and has an elliptical cross section. Such pipes are commonly referred to as "off-pipe pipes", which have a higher heat exchange rate than other pipes having a circular cross-section as described below.

Since the cross section of the front and rear stainless steel elliptical tube 240 is elliptical, the assembly groove is curved so that the elliptic front and rear stainless steel elliptic tubes 240 are closely contacted.

In particular, two front and rear stainless steel elliptical tubes 240 are provided on the front side plate F and the rear side plate B, respectively. The first front and rear stainless steel elliptical tube 241 and the second front and rear stainless steel elliptical tube 242 are provided on the front side plate F and the first front and rear stainless steel elliptical tubes 241 and 242 are also provided on the rear side plate B. And a second front and rear stainless steel elliptical tube (242).

At this time, the first front and rear stainless steel elliptical tubes 241, which are relatively low in the two front and rear stainless steel elliptical tubes 240, are disposed lower than the CO reduction pipe 220 and higher than the main heat exchange tubes 230 . At the same time, the second front and rear stainless steel elliptical tubes 242 at a relatively high position are disposed at positions higher than the CO reduction pipe 220.

The relative height difference is compared with respect to the origin of the hollow portion provided inside each heat exchange tube, that is, the center point of each heat exchange tube when viewed in section. 5 (b), the first front and rear stainless steel elliptical tube 241 and the CO reduction pipe partially overlap each other. However, the center point of the first and the second front and rear stainless steel elliptical tubes 241 and 241 is relatively more low.

As described above, when the front and rear stainless steel elliptical tubes 240 are fixed to the inner side surfaces of the front side plate F and the rear side plate B, the heat exchanger body 210 is prevented from being deformed by overheating, The rate is high.

In addition, when the front and rear stainless steel elliptical pipes 240 are placed in the fitting grooves formed on the inner side surfaces of the front side plate F and the rear side plate B, the front and rear side stainless steel elliptical pipes 240 are prevented from being directly exposed to the inside of the heat exchanger body 210, 3 Heat exchange tube 140 significantly reduces solid-state radiation and prevents rapid cooling of the combustion gas.

If the first front and rear stainless steel elliptical tubes 241 are disposed at a lower position than the plurality of CO reduction pipes 220, the combustion gas is rapidly reduced in temperature while passing through the height at which the CO reduction pipe 220 is disposed ≪ / RTI >

This is because the first front and rear stainless steel elliptical tube 241 and the CO reduction pipe 220 are vertically dispersed. Further, the first front and rear stainless steel elliptical tubes 241 are positioned higher than the main heat exchanger tube 230, The temperature gradient of the gas is changed more gently as a whole.

Also, since the second front and rear stainless steel elliptical tubes 242 are disposed at a higher position than the environmentally friendly heat exchange, even if disposed on the upper part of the heat exchanger body 210, it is possible to reduce the solid phase radiation as described above, And the temperature gradient of the combustion gas becomes gentle from the top.

7 (a) shows the CO emission of a freely propagating flame versus a porous burner flame at an air ratio of 1.6.

Also, 'U' means the distance from the flame, and its unit [m / s] is the distance expressed by the rate at which the flame reaches.

At this time, as indicated by red solid lines and dotted lines, it can be seen that as the distance from the premixed burner flame is increased (that is, the heat exchange takes place downstream), the emission amount of CO is significantly reduced.

FIG. 7 (b) shows the OH mass fraction of the free-air flame versus the pre-mixed burner flame. As the distance from the flame increases, the OH mass fraction decreases.

Accordingly, the CO reduction pipe 220 is disposed at the central portion of the heat exchanger body 210, not at the top, so as to separate the flame from the flame, and the first front and rear stainless steel elliptical pipes 241 are disposed at lower positions, As shown in FIG.

8 (a) is for examining the heat transfer performance of the tube having a circular section, FIG. 8 (b) is for examining the heat transfer performance of the tube having an elliptical section, and FIG. Correspond to the main heat exchange tube 230 and the front and rear stainless steel elliptical tube 240 of the present invention.

The main heat exchange tube 230 and the front and rear stainless steel elliptical tube 240 of the present invention as shown in FIG. 8 (b) have a total nusselt number as shown in Equation (1) It can be seen that the higher the number of noiseless and accordingly the higher the thermal conductivity, the higher the efficiency.

[Equation 1]

Figure pat00001

(Where htot is the heat transfer coefficient, D is the tube diameter, and k is the fluid thermal conductivity)

The main heat exchange tube 230 of the present invention and the front and rear stainless steel elliptical tube 240 having an elliptical cross-section are calculated from the following equation (2) And has a coefficient of friction of 40%.

&Quot; (2) "

Figure pat00002

(Ρ is the fluid density, V is the fluid velocity, H is the height of the tube, and L is the length of the tube), where Δp is the tube friction pressure loss,

Therefore, it is preferable to use an oval pipe whose cross section is an elliptical shape in consideration of the total number of Nitot and the coefficient of friction f as a whole, and that the main heat exchange pipe 230 and the front and rear stainless steel elliptic pipe 240 are preferably made of oval pipes .

9 (a) and 9 (b) show the results of measuring the temperature of the outer wall surface of the heat exchanger body 210 with the thermal imaging camera in the actual combustion state. FIG. 9 (a) (B) shows the application of the present invention.

9 (a) corresponds to 691 ℉ (= 366 캜), whereas the temperature of the point 'sp2' in Fig. 9 (b) corresponding to the corresponding portion corresponds to 455 ℉ (= 235 [deg.] C), the thermal efficiency of the present invention is more excellent.

The first connector C1 to the fourth connector C4 which are omitted from the above description are provided with a CO reduction pipe 220 for different purposes, a main heat exchange pipe 230 and a front and rear stainless steel elliptical pipe 240, So that the low-temperature directs pass through all of them.

Therefore, the direct water is circulated through the main heat exchanger tube 230, the first front and rear stainless steel elliptical tube 241 provided in the front side plate F, the plurality of CO reduction pipes 220, 1 A front and rear stainless steel elliptical tube 242 provided on the front and rear stainless steel elliptical tube 241 and the rear side plate B and a second front and rear stainless steel elliptical tube 242 provided on the front side plate F, Lt; / RTI >

The inlet IN into which the low temperature direct water flows is installed in the main heat exchange tube 230 corresponding to the inlet side of the plurality of main heat exchange tubes 230 disposed below the heat exchanger body 210.

On the other hand, the outlet (OUT) through which high-temperature water having a raised temperature through heat exchange is discharged is formed by a plurality of second front and rear stainless steel elliptical pipes (242) disposed on the upper part of the heat exchanger body 2 is installed on the front and rear stainless steel elliptical pipe 242.

Accordingly, since the direct water whose temperature is increased through the heat exchange flows along the upper portion of the heat exchanger body 210 near the burner, the heat exchange is relatively small as compared with the case where the direct water of low temperature flows above the heat exchanger body 210 .

The specific embodiments of the present invention have been described above. It is to be understood, however, that the scope and spirit of the present invention is not limited to these specific embodiments, and that various modifications and changes may be made without departing from the spirit of the present invention. If you have, you will understand.

Therefore, it should be understood that the above-described embodiments are provided so that those skilled in the art can fully understand the scope of the present invention. Therefore, it should be understood that the embodiments are to be considered in all respects as illustrative and not restrictive, The invention is only defined by the scope of the claims.

210: heat exchanger body
220: CO reduction pipe
221: Stainless round U shape
230: main heat exchanger tube
230a: heat exchange pin
231: Stainless steel oval U-tube
240: Front and rear stainless steel elliptical tube
L: left side plate
R: right side plate
F: front side plate
B: rear side plate
IN: Receipt
OUT: Outlet

Claims (6)

The upper and lower portions are respectively opened so as to be surrounded by the front side plate F, the rear side plate B, the left side plate L and the right side plate R so that the high temperature combustion gas introduced from the upper combustion chamber is discharged downward A heat exchanger body 210;
Are positioned between the left side plate (L) and the right side plate (R) and located at an intermediate portion with respect to the height direction of the heat exchanger body (210) to prevent the temperature of the combustion gas from rapidly decreasing, A plurality of CO reduction pipes 220 for reducing the generation of CO;
A stainless circular U-shaped tube 221 coupled to the outside of the left side plate L and the right side plate R and connecting open ends of the CO reduction pipes 220 disposed adjacent to each other;
The CO reduction pipe 220 is disposed at a lower portion of the CO reduction pipe 220 and is disposed relatively far from the flame as compared with the CO reduction pipe 220 and is sandwiched between the left side plate L and the right side plate R, A main heat exchange tube 230 having a heat exchange fin 230a on an outer circumferential surface thereof so as to increase the heat exchange efficiency;
A stainless steel elliptic U tube 231 coupled to the outside of the left side plate L and the right side plate R to connect open ends of the adjoining main heat exchange tubes 230 to each other; And
Is fixed to the inner surfaces of the front side plate (F) and the rear side plate (B) so as to prevent the solid phase radiation of the combustion gas from being directly exposed on the combustion gas flow path inside the heat exchanger body (210) And a front and rear stainless steel elliptical tube (240) made of a stainless steel material having an oval cross section so as to increase the height of the tube. The method according to claim 1,
The front side plate F and the rear side plate B are respectively formed with an assembly groove on which the front and rear stainless steel elliptical tubes 240 are seated,
Wherein the front and rear stainless steel elliptical tubes (240) are secured to the front side plate (F) and the rear side plate (B) by brazing welding after being seated in the mounting grooves. 3. The method of claim 2,
Two front and rear stainless steel elliptical tubes 240 are provided on the front side plate F and the rear side plate B,
The first front and rear stainless steel elliptical tube 241 located at a relatively low position is disposed at a position lower than the CO reduction pipe 220 and higher than the main heat exchange tube 230,
And the second front and rear stainless steel elliptical tube (242) located at a relatively high position is disposed at a higher position than the CO reduction pipe (220). The method of claim 3,
The inlet (IN) to which low temperature direct water flows is installed in a main heat exchange tube (230) corresponding to an inlet side of the plurality of main heat exchange tubes (230) disposed below the heat exchanger body (210)
The outlet (OUT) through which hot water having a raised temperature through the heat exchange is discharged is connected to the outlet port of the second front and rear stainless steel elliptical tubes (242) disposed on the upper part of the heat exchanger body (210) Wherein the heat exchanger is installed in a front and rear stainless steel elliptical tube (242). 5. The method according to any one of claims 1 to 4,
The main heat exchanger tube 230 is a tube having an elliptical cross section,
Wherein the stainless elliptical U-shaped pipe (231) is a U-shaped connection pipe having an elliptical cross-section. 5. The method according to any one of claims 1 to 4,
The plurality of CO reduction pipes 220 are spaced apart from each other in the horizontal direction of the heat exchanger body 210,
The middle portion of the heat exchanger body 210 in which the CO reducing pipes 220 are installed is positioned at an upper portion with respect to the center in the height direction of the heat exchanger body 210 by 20% To 20% of the total amount of the heat exchanger.
KR1020140098970A 2014-08-01 2014-08-01 High efficiency environmental-friendly sensible heat exchanger KR20160015945A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101676993B1 (en) * 2016-05-03 2016-11-16 (주)귀뚜라미 U-bend pipe type heat exchanger

Families Citing this family (2)

* Cited by examiner, † Cited by third party
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US20170299274A1 (en) * 2016-04-18 2017-10-19 Daesung Celtic Enersys Co., Ltd. Heat exchanger
CN109737773B (en) * 2019-01-09 2020-03-31 西安交通大学 Solid bulk heat exchanger with multi-tube combined elliptical heat exchange tubes

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100515635B1 (en) * 2003-06-23 2005-09-16 주식회사 경동보일러 Structure of Heat Exchanger in Condensing Gas Boiler
KR20090067760A (en) * 2007-12-21 2009-06-25 주식회사 경동나비엔 Heat exchanger of upward conbustion type condensing boiler
KR101199621B1 (en) * 2010-08-12 2012-11-08 주식회사 경동나비엔 Condensing boiler
KR20140051760A (en) * 2012-10-23 2014-05-02 (주)귀뚜라미 Environmental-friendly heat exchanger
KR101422347B1 (en) * 2012-10-23 2014-07-22 (주)귀뚜라미 Condensation heat exchanger having dummy pipe

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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US10107569B2 (en) 2016-05-03 2018-10-23 Kiturami Boiler Co., Ltd. U-bend pipe type heat exchanger

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