JP5525018B2 - Waste heat exchange system and method - Google Patents

Description

  The present invention relates to a waste heat exchange system, and more particularly, to a waste heat exchange system externally attached to a chimney of a boiler and a method thereof.

  The waste heat or exhaust heat discharged from the boiler chimney is very high temperature, and if it is released into the air as it is, it can be a waste of energy and at the same time contribute to global warming.

  Therefore, in order to effectively use the waste heat of the boiler, a waste heat exchanger is installed in the boiler. As disclosed in Patent Document 1 below, a conventional waste heat exchanger is configured to install a heat absorption unit for heat exchange inside a chimney of a boiler.

  However, such a conventional waste heat exchanger needs to install a heat exchange device inside the chimney of the boiler, so a large-scale installation work is required, and the installation cost is high. When installing in boilers other than gas, such as heavy oil boilers, where the chimney is likely to corrode, soot tends to accumulate inside the chimney or heat exchanger. There is a problem in that it is necessary to replace them manually and it takes time and effort to clean so as to remove soot.

Japanese Utility Model Publication No.59-172942

  The present invention provides a waste heat exchange system with high heat exchange efficiency that can be easily installed at low cost and can be externally attached without making a hole in a chimney.

A waste heat exchange system according to an embodiment of the present invention includes a coil-shaped heat exchange pipe that is wound around a chimney of a boiler without gaps and is connected to a lower end of the heat exchange pipe. A water circulation pipe for supplying water or hot water inside,
Connected to the upper end of the heat exchange pipe and supplied with water or hot water discharged from the heat exchange pipe, and connected to the water circulation pipe, the water or hot water in the water circulation pipe It is connected between the hot water storage tank that temporarily stores, the water circulation pipe and the hot water storage tank, and circulates the water or hot water in the hot water storage tank into the water circulation pipe, the heat exchange pipe, and the water circulation pipe. The heat exchange pipe constitutes a plurality of heat exchange pipe units, and each heat exchange pipe unit is continuously attached to the outside of the chimney without a gap, and the water circulation pipe is a heat exchange pipe. The water or hot water in the hot water storage tank is supplied to the inside, and the water circulation pipe supplies the water or hot water discharged from the heat exchange pipe to the hot water storage tank, each heat exchange pipe, the water circulation pipe, and the water circulation pipe. , Hot water tanks and circulation ports At least a part of the flop may be covered with racking material.

  In the waste heat exchange system according to the embodiment of the present invention, the water circulation pipe and the water circulation pipe may have a larger outer diameter, inner diameter, and thickness than the heat exchange pipe.

  In the waste heat exchange system according to the embodiment of the present invention, the heat exchange pipe is a copper tube having an outer diameter of 8 mm to 11 mm, an inner diameter of 6 mm to 9 mm, and a thickness of 0.5 mm to 1.5 mm, and has a length. One heat exchange pipe unit may be constituted by 10 to 30 m, and 1 to 16 heat exchange pipe units may be formed.

  Further, in the waste heat exchange system according to the embodiment of the present invention, the water circulation pipe and the water circulation pipe are copper tubes having an outer diameter of 25 mm to 30 mm, an inner diameter of 23 mm to 28 mm, and a thickness of 0.5 mm to 1.5 mm. It may be.

  In the waste heat exchange system according to the embodiment of the present invention, at least one of the heat exchange pipe, the incoming water circulation pipe, and the outgoing water circulation pipe may be a copper pipe.

  In the waste heat exchange method according to the embodiment of the present invention, a heat exchange pipe is molded and attached to the outside of a boiler chimney in a coil shape without a gap, and a water circulation pipe for supplying water or hot water into the heat exchange pipe is provided. The upper end of the heat exchange pipe is connected to the lower end of the heat exchange pipe, and the upper end of the heat exchange pipe is connected to the water circulation pipe supplied with water or hot water supplied from the heat exchange pipe. Alternatively, a circulation pipe for water discharge is connected to a hot water storage tank that temporarily stores hot water, and the water or hot water in the hot water storage tank is circulated for incoming water by a circulation pump installed between the water circulation pipe and the hot water storage tank. Including heat pipes, heat exchange pipes, and circulation pipes for water discharge, the heat exchange pipes constitute a plurality of heat exchange pipe units, and the heat exchange pipe units are continuous without gaps outside the chimney Attached, The water circulation pipe supplies the water or hot water in the hot water storage tank into the heat exchange pipe, and the water circulation pipe receives the supply of water or hot water discharged from the heat exchange pipe, and the heat exchange pipe and the water circulation At least a part of the pipe, the water circulation pipe, the hot water storage tank, and the circulation pump may be covered with a racking material.

A method for manufacturing a waste heat exchange system according to an embodiment of the present invention includes removing a single chimney member constituting an assembly-type chimney from a boiler, placing the removed chimney member on a heat exchange pipe before molding, and The heat exchange pipe is formed into a coil shape by winding the heat exchange pipe around the outer periphery of the member without any gap, and the heat exchange pipe molded into the coil shape is removed from the chimney member, and the other heat exchange pipe is removed without any gap around the outer periphery of the chimney member. Produce multiple heat exchange pipe units by wrapping,
A plurality of heat exchange pipe units formed in a coil shape are continuously fitted from the upper end of the assembly chimney of the boiler, and the lower end of each heat exchange pipe unit fitted in the chimney is connected to a hot water tank. Connected to the water circulation pipes connected to each other, the upper end of each heat exchange pipe unit fitted in the chimney was connected to the water circulation pipe connected to the hot water tank, and water or hot water in the hot water tank was A circulation pump may be installed between the hot water storage tank and the incoming water circulation pipe so as to circulate in the incoming water circulation pipe, the heat exchange pipe, and the outgoing water circulation pipe.

  According to the present invention, the temperature of water or hot water in a hot water tank can be easily installed at low cost in a chimney of a boiler, can be externally attached without making a hole in the chimney, and waste heat discharged from the boiler is It is possible to provide an efficient waste heat exchange system that can be effectively used for climbing.

  Further, according to the present invention, even if any part of the heat exchange pipe is clogged or damaged, only one heat exchange pipe unit including the inconvenience part is removed from the system for repair or replacement. Therefore, maintenance such as repair and replacement can be easily performed without removing other heat exchange pipe units.

  Further, according to the present invention, when the heat exchange pipe is repaired or exchanged, only the lower end of the heat exchange pipe constituting the heat exchange pipe unit is removed from the system to process other system components. Easily drain the water or hot water inside the pipe and perform maintenance such as repair and replacement

It is the schematic which shows the whole structure of the waste heat exchange system which concerns on one Embodiment of this invention. It is the schematic which shows the heat exchange pipe unit which concerns on one Embodiment of this invention. It is the schematic which shows the state which wound the racking material around the heat exchange pipe unit shown in FIG. It is sectional drawing of the heat exchange pipe which concerns on one Embodiment of this invention. It is sectional drawing of the circulation pipe which concerns on one Embodiment of this invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the embodiments, the same components are denoted by the same reference numerals, and redundant description is omitted.

[Configuration of waste heat exchange system]
FIG. 1 is a schematic diagram showing the overall structure of a waste heat exchange system according to an embodiment of the present invention. As shown in FIG. 1, a waste heat exchange system 1 according to an embodiment of the present invention includes a boiler 100 and a hot water tank 700, and heat exchange pipes 502, 504, 506, 508 are provided outside a chimney 200 of the boiler. Is wound around the coil without any gaps. Further, the upper and lower ends of the heat exchange pipes 502, 504, 506, and 508 are respectively connected at the lower ends thereof to the incoming water circulation pipe 300 and connected at the lower ends thereof to the outgoing water circulation pipe 400 to store hot water. Water or hot water in the tank 700 is circulated through the water-introducing circulation pipe 300, the heat exchange pipes 502, 504, 506, and 508 and the water-out circulation pipe 400 by the power of the circulation pump 600.

  The boiler 100 has a structure having a chimney or a smoke exhaust / exhaust function, and may have any structure as long as heat is exhausted from the smoke exhaust structure such as a chimney. The type is not particularly limited. For example, the boiler 100 may be a hot water boiler that supplies hot water or a steam boiler that supplies steam. Further, the fuel of the boiler 100 is not particularly limited. For example, the fuel of the boiler 100 may be solid fuel such as coal, kerosene or heavy oil, or gas such as city gas, liquefied petroleum gas (LPG), or liquefied natural gas (LNG). Good. Furthermore, the boiler 100 may be a round boiler or a water tube boiler such as a once-through boiler. Moreover, although only one boiler 100 is described in FIG. 1, a plurality of boilers may be installed in the heat exchange system 1 according to the present invention.

  It suffices that the hot water storage tank 700 has a structure capable of storing water or hot water circulating in the heat exchange system 1 according to the present invention, and the type of the hot water storage tank 700 is not particularly limited. Preferably, the hot water tank 700 may be formed of a material and a structure excellent in resistance to high temperature, stress, or corrosion. For example, the hot water tank 700 may be made of stainless steel, and the capacity of the hot water tank 700 may be 2 tons. Moreover, the installation location of the hot water tank 700 may be indoors or outdoors.

  The chimney 200 of the boiler 100 is a structure that serves as a flow path for discharging smoke and exhaust discharged from the boiler 100, and has any structure as long as heat is discharged. May be. For example, the chimney 200 may have a hollow cylindrical shape with an outer diameter of 200 mm, or may be made of a metal such as iron.

  The heat exchange pipes 502, 504, 506, and 508 may have a hollow pipe shape made of metal, preferably copper, and one end is connected to the incoming circulation pipe 300 for each predetermined length, and the other A plurality of heat exchange pipe units whose ends are connected to the water circulation pipe 400 may be formed. FIG. 1 shows an example in which four such heat exchange pipe units are continuously formed vertically, but the number of heat exchange pipe units is not limited to this.

  The heat exchange pipes 502, 504, 506, and 508 absorb waste heat exhausted from the chimney 200, conduct heat to the heat exchange pipes 502, 504, 506, and 508, and exchange heat conducted from the chimney. It has a heat exchange function of transferring heat to water or hot water circulating in the pipes 502, 504, 506, and 508.

  As shown in FIG. 1, the inflow circulation pipe 300 and the outflow circulation pipe 400 may be installed so as to extend long in the longitudinal direction substantially parallel to the chimney 200 of the boiler 100. The circulation pipe 300 for incoming water is a pipe for supplying water or hot water in the hot water storage tank 700 into the heat exchange pipes 502, 504, 506, and 508 wound around the chimney 200. The water circulation pipe 400 is for discharging hot water heated by heat discharged from the chimney 200 when passing through the heat exchange pipes 502, 504, 506, and 508 wound around the chimney 200. It is a pipe. Hot water discharged into the outlet water circulation pipe 400 is temporarily stored in the hot water storage tank 700 through the outlet water circulation pipe 400.

  As described above, a circulation pump 600 may be installed between the hot water storage tank 700 and the incoming water circulation pipe 300 as power for circulating the water or hot water in the hot water storage tank 700. The circulation pump 600 may be anything as long as it can circulate water or hot water in the hot water tank 700. For example, the circulation pump 600 may have a rated output of 0.75 kw, a rated current of 3.6 A, a rotational speed of 8260 min-1, a rated voltage of 200 V, a rated input of 900 w, and a rated frequency of 50 Hz.

  FIG. 2 is a schematic view showing a heat exchange pipe unit 520 according to an embodiment of the present invention. The heat exchange pipe unit 520 is formed by winding a heat exchange pipe 502 having a predetermined length from below to above the chimney 200 in a coil shape along the outer periphery of the chimney 200 without a gap. The end (lower end) of the heat exchange pipe 502 below the chimney 200 is connected to the circulation pipe 300 for incoming water, and water or hot water in the hot water storage tank 700 is supplied into the heat exchange pipe 502. On the other hand, the end portion (upper end portion) of the heat exchange pipe 502 above the chimney 200 is connected to the water circulation pipe 400, and hot water heated when passing through the heat exchange pipe 502 is contained in the water circulation pipe 400. To be discharged.

  As described above, the waste heat exchange system according to the present invention has a structure in which water or hot water in the hot water storage tank 700 is supplied below the heat exchange pipe 502 constituting one heat exchange pipe unit and discharged from above. By providing, for example, when a part of the heat exchange pipe 502 is clogged or damaged, the connection portion with the water circulation pipe located below the heat exchange pipe is blocked, and the heat exchange pipe 502 is disposed below the heat exchange pipe. By removing the end of the water from the water circulation pipe, the water or hot water inside the heat exchange pipe can be left to gravity and discharged naturally.

  As described above, according to the waste heat exchange system according to the present invention, when the heat exchange pipe is repaired or exchanged, by removing only the lower end of the heat exchange pipe constituting the heat exchange pipe unit from the system, It is possible to easily perform maintenance such as repair and replacement by draining the water or hot water inside the pipe without processing system components.

  The length of the heat exchange pipe 502 that forms one heat exchange pipe unit 520 may be any length as long as the heat exchange pipe 502 can efficiently absorb the waste heat discharged from the chimney 200. It may be. Preferably, the length of the heat exchange pipe 502 forming one heat exchange pipe unit 520 is 10 m to 30 m, and more preferably 20 m.

  Although only one heat exchange pipe unit 520 is illustrated in FIG. 2, when a plurality of heat exchange pipe units are formed in the waste heat exchange system 1 according to the present invention, heat exchange that forms each heat exchange pipe unit is performed. The length of the pipe unit may be the same. For example, in the above example, when the length of the heat exchange pipe 502 forming one heat exchange pipe unit 520 is 20 m, four heat exchange pipe units are formed in the waste heat exchange system 1 according to the present invention. In this case, the lengths of the heat exchange pipes forming the other three heat exchange pipe units may also be 20 m, respectively.

  According to the method for manufacturing a waste heat exchange system according to an embodiment of the present invention to be described later, the length of the heat exchange pipe unit forming each heat exchange pipe unit is used when the heat exchange pipe is formed into a coil shape. You may match with the size of a chimney member.

  As described above, by forming a plurality of heat exchange pipe units in the waste heat exchange system 1 according to the present invention, the inconvenience occurs even when any part of the heat exchange pipe is clogged or damaged. Since only one heat exchange pipe unit including a part can be removed from the system for repair or replacement, maintenance such as repair and replacement can be easily performed without removing other heat exchange pipe units.

  FIG. 3 is a schematic view showing a state in which a racking material is wound around the heat exchange pipe unit shown in FIG. In FIG. 1, the racking material is not shown in order to easily understand the overall image of the waste heat exchange system 1 according to the present invention. However, as shown in FIG. 3, the waste heat exchange system 1 is wound around the chimney 200 of the boiler 100. The entire outside of the heat exchange pipe 502 may be covered with a racking material unit 800 for heat insulation.

  As shown in FIG. 3, the racking material unit 800 includes a thin metal foil sheet 803 that covers one whole surface, and a heat insulating material layer 805 that is formed on the inner side of the metal foil sheet 803 and is made of a heat insulating material having a thickness that is in contact with the heat insulating object. The sheet-like thing which laminated | stacked these may be sufficient. The heat insulating material layer 805 may be any material as long as it is a material excellent in heat retention or heat insulation and heat resistance, for example, glass wool, rock wool, cellulose fiber, urethane foam, phenol foam, and the like. Good. Further, the metal foil sheet 803 formed on one surface of the heat insulating material layer 805 may be any metal as long as it is a material excellent in heat insulating property or heat insulating property. For example, the metal foil sheet 803 may be a laminate of aluminum craft paper (aluminum foil 7 microns + craft 50 g / m 2).

  The racking material unit 800 shown in FIG. 3 may be appropriately installed in a place where heat insulation or heat insulation is necessary in the waste heat exchange system 1 according to the present invention. For example, the heat wrapped around the chimney 200 of the boiler 100 is used. The entire outside of the exchange pipe, the outside of the incoming water circulation pipe 300 including the connection with the end of the heat exchange pipe, the outside of the outgoing water circulation pipe 400, the outside of the hot water storage tank and the circulation pump, or a portion exposed to the outside, etc. May be installed as appropriate.

  By covering the outside of the heat exchange pipe 502 wound around the outer periphery of the chimney 200 of the boiler 100 with the racking material unit 800 in this way, the heat of the chimney that becomes high temperature due to the waste heat discharged from the boiler 100 is in the air. Therefore, the waste heat of the boiler can be efficiently used to increase the temperature of water or hot water in the hot water storage tank 700.

  FIG. 4 is a cross-sectional view of a heat exchange pipe 502 according to an embodiment of the present invention. The heat exchange pipe 502 efficiently absorbs waste heat exhausted from the chimney and conducts heat, and efficiently transfers the heat absorbed by the heat exchange pipe to water or hot water circulating in the heat exchange pipe. Designed to be able to. As such a heat exchange pipe having an efficient waste heat exchange function, it is preferable that the outer diameter L is 8 mm to 11 mm, the inner diameter M is 6 mm to 9 mm, and the thickness N is 0.5 mm to 1.5 mm. In one embodiment of the present invention, the heat exchange pipe 502 may have an outer diameter L of 9.52 mm, an inner diameter M of 7.92 mm, and a heat exchange pipe 502 thickness N of 0.8 mm. However, the shape of the heat exchange pipe according to the present invention is not limited to this. Furthermore, the material forming the heat exchange pipe having an efficient waste heat exchange function is preferably a metal having excellent heat exchange properties, such as copper.

  FIG. 5 is a cross-sectional view of a water circulation pipe 400 according to an embodiment of the present invention. The outlet water circulation pipe 400 is designed such that the temperature of the hot water discharged from the heat exchange pipe can be maintained and the hot water can be recirculated into the hot water storage tank 700. For this reason, the water circulation pipe 400 may be designed with a larger outer diameter, inner diameter, or thickness than a heat exchange pipe intended for efficient heat exchange. Specifically, the water circulation pipe 400 preferably has an outer diameter L ′ of 25 mm to 30 mm, an inner diameter M ′ of 23 mm to 28 mm, and a thickness N ′ of 0.5 mm to 1.5 mm. In one embodiment of the present invention, the outer diameter L ′ of the water circulation pipe 400 is 28.58 mm, the inner diameter M ′ is 26.58 mm, and the thickness N ′ of the water circulation pipe 400 is 1.0 mm. Also good. However, the shape of the water circulation pipe according to the present invention is not limited to this. Moreover, the outer diameter, the inner diameter, and the thickness of the water circulation pipe may be formed with the same dimensions as the water circulation pipe. Further, the material forming the water circulation pipe and the water circulation pipe is preferably a metal excellent in heat retaining properties, for example, copper.

  As described above, according to the waste heat exchange system according to the present invention, the waste heat discharged from the boiler can be effectively used for increasing the temperature of water or hot water in the hot water storage tank with a simple configuration. Moreover, in the waste heat exchange system according to the present invention, since it is not necessary to make a hole in the chimney of the boiler, there is no inconvenience that corrosion occurs from the hole formed in the chimney of the boiler. In addition, since the heat exchange pipe is installed around the outside of the chimney, there is no need to install heat exchange components inside the chimney of the boiler, especially in boilers that use fuel other than gas. Easy to clean and maintain. Furthermore, since there is no need to make holes in the chimney of the boiler or to set parts inside the chimney, a large-scale installation work is required when the waste heat exchange system according to the present invention is installed in an existing boiler after the fact. There is no need to do so, and the installation cost and removal cost of the waste heat exchange system according to the present invention can be reduced.

[Waste heat exchange method]
Next, the waste heat exchange method according to the above-described embodiment will be described with reference to FIGS. Referring to FIG. 1, in the waste heat exchange method according to the present invention, the water or hot water in the hot water storage tank 700 is converted into heat exchange pipes 502, 504, and 506 via the incoming water circulation pipe 300 by the power of the circulation pump 600. , 508 and the water or hot water that has passed through the heat exchange pipe 300 is discharged into the water circulation pipe 400, and the water or hot water discharged into the water circulation pipe 400 is the water circulation pipe 400. It is supplied into the hot water storage tank 700 via.

  Here, as shown in FIG. 1 and FIG. 2, the heat exchange pipe 502 is wound around the outer periphery of the chimney 200 of the boiler 100 without a gap in a coil shape, so that the heat exchange pipe 502 is heated to a high temperature by waste heat exhausted from the boiler 100. The heat of the chimney is transferred to the heat exchange pipe 502, and the heat transferred to the heat exchange pipe 502 is transmitted to water or hot water circulating in the heat exchange pipe 502. As a result, while the water or hot water in the hot water storage tank 700 circulates in the heat exchange pipes 502, 504, 506, and 508, the heat transferred to the heat exchange pipe is received and the temperature rises.

  In the waste heat exchange method according to an embodiment of the present invention, for example, the temperature of the chimney 200 may be about 180 ° C. In this case, the temperature of the water or hot water in the hot water tank 700 is 2 ° C. to 4 ° C. while circulating in the heat exchange pipes 502, 504, 506, 508 by the waste heat exchange method according to an embodiment of the present invention. Can be raised.

  In the waste heat exchange method according to the embodiment of the present invention, the heat exchange pipes 502, 504, 506, and 508 may constitute a plurality of heat exchange units as shown in FIG.

  In the waste heat exchange method according to an embodiment of the present invention, the plurality of heat exchange pipe units may be continuously attached to the outside of the chimney 200 without a gap.

  In the waste heat exchange method according to an embodiment of the present invention, as shown in FIG. 3, at least a part of the heat exchange pipe, the incoming water circulation pipe, the outgoing water circulation pipe, the hot water storage tank, and the circulation pump is a racking material. It may be covered with. Thereby, it is possible to prevent waste heat discharged from the boiler 100 from discharging waste heat into the air wastefully into the air, and to efficiently raise the temperature of the water or hot water in the hot water tank 700. The waste heat of can be used.

  As described above, according to the waste heat exchanging method according to the present invention, the waste heat discharged from the boiler can be effectively used for increasing the temperature of water or hot water in the hot water tank with a simple configuration.

  Moreover, in the waste heat exchange method according to the present invention, since it is not necessary to make a hole in the chimney of the boiler, there is no inconvenience that corrosion occurs from the hole formed in the chimney of the boiler. In addition, since the heat exchange pipe is installed around the outside of the chimney, there is no need to install heat exchange components inside the chimney of the boiler, especially in boilers that use fuel other than gas. Easy to clean and maintain. Furthermore, since there is no need to make holes in the chimney of the boiler or to set parts inside the chimney, a large-scale installation work is required when the waste heat exchange system according to the present invention is installed in an existing boiler after the fact. There is no need to do so, and the installation cost and removal cost of the waste heat exchange system according to the present invention can be reduced.

[Manufacturing method of waste heat exchange system]
Next, a method for manufacturing a waste heat exchange system according to an embodiment of the present invention will be described with reference to FIGS.

  The manufacturing method of the heat exchange pipes 502, 504, 506, and 508 in the waste heat exchange system 1 according to the embodiment of the present invention shown in FIG. 1 is as follows.

  First, the heat exchange pipe is formed into a coil shape by utilizing the outer peripheral shape of the chimney around which the heat exchange pipes 502, 504, 506, and 508 are wound.

  Specifically, as shown in FIG. 2, when the chimney to which the heat exchange pipes 502, 504, 506 and 508 are to be wound is an assembled chimney, one chimney member constituting the assembled chimney is removed. The chimney member is placed on a linear heat exchange pipe before molding, and the heat exchange pipe is formed in a coil shape by winding the heat exchange pipe around the outer periphery of the chimney member without gaps. According to such a forming method, the heat exchange pipe can be easily and cleanly formed so as to have a coil shape that is in close contact with the outer shape of the chimney without a gap. By such a manufacturing method, it is difficult to generate a useless space or a gap between the chimney and the heat exchange pipe, so that the waste heat of the boiler is more efficiently conducted or transmitted to water or hot water in the heat exchange pipe. Can do.

  By extracting one unit of the heat exchange pipe formed in this way from the chimney member, the same one chimney member can be reused to form a heat exchange pipe forming another unit into a coil shape. Thus, the heat exchange pipes of the number of units installed in the chimney can be molded together.

  Multiple heat exchange pipe units molded in this way can be easily installed outside the chimney by attaching the removed chimney member to the original position and then fitting it continuously from the upper end of the chimney. can do.

  Thereafter, the ends of each heat exchange pipe unit are welded to the water circulation pipe 300 and the water circulation pipe 400, respectively, so that the heat exchange pipe, the water circulation pipe 300 and the water discharge connected as shown in FIG. The circulating pipe 400 for use can be manufactured.

  Thereafter, as shown in FIG. 3, at least a part of the heat exchange pipe, the incoming water circulating pipe, the outgoing water circulating pipe, the hot water storage tank, and the circulating pump may be covered with a racking material. Thereby, it is possible to prevent waste heat discharged from the boiler 100 from discharging waste heat into the air wastefully into the air, and to efficiently raise the temperature of the water or hot water in the hot water tank 700. The waste heat of can be used.

  Thus, according to the manufacturing method in which the heat exchange unit previously formed into a coil shape is fitted from the chimney upper end portion and each end portion of the heat exchange pipe is connected to the incoming water circulation pipe 300 and the outgoing water circulation pipe 400, It is easy to add heat exchange pipe units later.

  As described above, according to the method for manufacturing a waste heat exchange system according to the present invention, the waste heat discharged from the boiler can be effectively used for increasing the temperature of water or hot water in the hot water tank with a simple configuration. Can do.

  Moreover, in the manufacturing method of the waste heat exchange system concerning this invention, since it is not necessary to make a hole in the chimney of a boiler, the problem which corrosion arises from the hole formed in the chimney of a boiler does not arise.

  Moreover, it is not necessary to install heat exchange components inside the chimney of the boiler, and it is easy to clean and maintain the boiler and the boiler chimney, particularly in a boiler that uses fuel other than gas. Furthermore, according to the manufacturing method of the waste heat exchange system according to the present invention, since the heat exchange pipe can be formed in a coil shape without gaps densely outside the chimney, it is useless between the chimney and the heat exchange pipe. Space and gaps are less likely to occur, and the waste heat of the boiler can be more efficiently conducted or transmitted to water or hot water in the heat exchange pipe.

  Furthermore, since it is possible to easily add a heat exchange pipe unit without drilling a hole in the chimney of the boiler or setting parts inside the chimney, the waste heat exchange system according to the present invention can be added to the existing boiler. Therefore, it is not necessary to perform a large-scale installation work when installing in the factory, and the installation cost and removal cost of the waste heat exchange system according to the present invention can be suppressed.

  DESCRIPTION OF SYMBOLS 1 ... Waste heat exchange system, 100 ... Boiler, 200 ... Chimney, 300 ... Circulation pipe for incoming water, 400 ... Circulation pipe for outgoing water, 502, 504, 506, 508 ... Heat exchange pipe, 520 ... Heat exchange pipe unit, 600 ... Circulation pump, 700 ... hot water storage tank, 800 ... racking material unit, 803 ... metal foil sheet, 805 ... heat insulation material layer.

Claims (7)

A coil-shaped heat exchange pipe formed by winding around the outside of the chimney of the boiler without any gaps,
A circulation pipe for entering water connected to the lower end of the heat exchange pipe and supplying water or hot water into the heat exchange pipe;
A circulation pipe for discharging water connected to an upper end of the heat exchange pipe and receiving supply of water or hot water discharged from the heat exchange pipe;
A hot water storage tank connected to the water circulation pipe and temporarily storing water or hot water in the water circulation pipe;
Circulation connected between the circulation pipe for incoming water and the hot water storage tank to circulate the water or hot water in the hot water storage tank into the circulation pipe for incoming water, the heat exchange pipe, and the circulation pipe for outgoing water. And a pump for
The heat exchange pipe constitutes a plurality of heat exchange pipe units,
Each of the heat exchange pipe units is continuously attached to the outside of the chimney without a gap,
The water circulation pipe supplies water or hot water in the hot water tank into the heat exchange pipe,
The circulation pipe for water discharge supplies water or hot water discharged from the heat exchange pipe to the hot water storage tank,
The waste heat exchange system, wherein at least a part of each of the heat exchange pipes, the incoming water circulation pipe, the outgoing water circulation pipe, the hot water storage tank, and the circulation pump is covered with a racking material. 2. The waste heat exchange system according to claim 1, wherein the water circulation pipe and the water circulation pipe have a larger outer diameter, inner diameter, and thickness than the heat exchange pipe. The heat exchange pipe has an outer diameter of 8 mm to 11 mm, an inner diameter of 6 mm to 9 mm, a thickness of 0.5 mm to 1.5 mm, and constitutes one heat exchange pipe unit with a length of 10 m to 30 m,
The waste heat exchange system according to claim 1 or 2, wherein 1 to 16 heat exchange pipe units are formed. 4. The water circulation pipe and the water circulation pipe have an outer diameter of 25 mm to 30 mm, an inner diameter of 23 mm to 28 mm, and a thickness of 0.5 mm to 1.5 mm, respectively. Waste heat exchange system described in 1. The waste heat exchange system according to any one of claims 1 to 4, wherein at least one of the heat exchange pipe, the incoming water circulation pipe, and the outgoing water circulation pipe is a copper pipe. . A heat exchange pipe is molded outside the chimney of the boiler and formed into a coil shape without any gaps.
Connecting a water circulation pipe for supplying water or hot water into the heat exchange pipe to the lower end of the heat exchange pipe;
Connecting an upper end of the heat exchange pipe to a circulation pipe for water supply supplied with water or hot water supplied from the heat exchange pipe;
Connecting the circulation pipe for water discharge to a hot water storage tank for temporarily storing water or hot water in the circulation pipe for water discharge;
By means of a circulation pump installed between the water circulation pipe and the hot water storage tank, the water or hot water in the hot water storage tank is converted into the water circulation pipe, the heat exchange pipe, and the water circulation pipe. Including supplying and circulating in,
The heat exchange pipe constitutes a plurality of heat exchange pipe units,
The heat exchange pipe unit is continuously attached to the outside of the chimney without a gap,
The water circulation pipe supplies water or hot water in the hot water tank into the heat exchange pipe,
The water circulation pipe receives supply of water or hot water discharged from the heat exchange pipe,
A waste heat exchanging method, wherein at least a part of the heat exchanging pipe, the incoming water circulating pipe, the outgoing water circulating pipe, the hot water storage tank and the circulating pump is covered with a racking material. Remove one chimney member that constitutes the assembled chimney from the boiler,
The removed chimney member is placed on a heat exchange pipe before molding, and the heat exchange pipe is molded into a coil shape by winding the heat exchange pipe around the chimney member without gaps,
The heat exchange pipe formed into the coil shape is removed from the chimney member, and a plurality of heat exchange pipe units are manufactured by winding other heat exchange pipes around the chimney member without gaps,
A plurality of heat exchange pipe units molded into the coil shape are continuously fitted from the upper end of the assembly chimney of the boiler,
The lower end of each heat exchange pipe unit fitted in the chimney is connected to a water circulation pipe connected to a hot water tank,
The upper end of each heat exchange pipe unit fitted in the chimney is connected to a circulation pipe for water discharge connected to the hot water tank,
For circulating water or hot water in the hot water storage tank between the hot water storage tank and the incoming water circulation pipe so as to circulate in the incoming water circulation pipe, the heat exchange pipe, and the outgoing water circulation pipe. A method of manufacturing a waste heat exchange system, characterized by installing a pump.

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