KR100392597B1 - Condensing Type Heat Exchanger of Gas Boiler - Google Patents

Abstract

The present invention relates to a condensing type heat exchanger of a gas boiler, comprising: a sensible heat exchanger having a sensible heat exchange pipe and a sensible heat exchange fin; A sensible heat / latent heat exchanger having a sensible heat / latent heat exchange pipe; A latent heat exchanger having a latent heat exchange pipe; A heat dissipation blocking wall and a heat dissipation absorption heat exchange pipe; Consists of heat exchange circuit caps installed on both sides of the heat exchanger and maximizes heat exchange efficiency with sensible heat exchange pins made of stainless steel, and the latent heat exchange pipe is formed with a smaller diameter than the sensible heat exchange pipe to maximize heat exchange area. The present invention relates to a gas boiler condensing heat exchanger that maximizes heat exchange efficiency between sensible heat and latent heat of condensation to realize light weight and compactness of heat exchanger.

Description

Condensing Type Heat Exchanger of Gas Boiler

The present invention relates to a heating and hot water boiler for gas, in particular a sensible heat exchanger having a sensible heat exchange pipe and a sensible heat exchange pin; A sensible heat / latent heat exchanger having a sensible heat / latent heat exchange pipe; A latent heat exchanger having a latent heat exchange pipe; Consists of heat dissipation barrier and heat-absorption heat-exchange pipes, condensing heat exchanger of gas boiler to maximize heat exchange efficiency and realize light weight and compactness with latent heat exchange fin of smaller diameter than sensible heat exchange pin and sensible heat exchange pipe .

In general, heating and hot water boilers used in homes are divided into oil boilers and gas boilers according to the fuel used. Among these, gas boilers having low air pollution and easy use are mainly used, and liquefied natural gas (LNG) is mainly used as the fuel. Gas boilers can be divided into various types according to the control method or sealed state, and can be classified into condensing and non-condensing types according to heat sources for heating heating water.

That is, FIG. 1 is a diagram showing the configuration of a gas condenser of a general condensing method. The gas boiler 2 exemplified herein is an air proportional control method in which a predetermined amount of air is always supplied by adjusting the air amount according to the temperature change of the heating water, and the blower 10 and the burner 12 are the combustor 4. It is arranged on the top. The upper part of the combustor 4 is provided with the burner 12 which combusts the air supply and gas sucked in through the intake duct 6 according to the operation of the blower 10, and below the burner 12 in turn, the sensible heat part The heat exchanger 14 and the latent heat exchanger 16 are arranged. The sensible heat exchanger 14 heats the heating water in a process in which combustion heat is directly contacted and heat exchanged in the burner, and the latent heat exchanger 16 recovers latent heat in the exhaust gas to heat the heating water.

The exhaust gas passing through the latent heat exchanger 16 is discharged to the outside through the exhaust duct 20, and the condensed water generated in the heat exchange process is collected in the exhaust hood 18 and then discharged to the outside.

Moreover, the circulation pump 22 which circulates heating water is arrange | positioned in the lower left part of a boiler. When the circulation pump 22 is operated, the heating water which has finished heating in the room flows into the heating water filter 24 through the line L1. The heating water filter 24 removes impurities contained in the heating water, and the filtered heating water is sent to the upper water separator 26. The water separator 26 is for discharging air contained in the heating water, and discharges the air through the upper air vent.

At this time, an overpressure preventing valve 32 is installed between the heating water filter 24 and the water separator 26 to prevent the pressure of the heating water from being excessively increased, and a part of the heating water is transferred to the expansion tank 48. To control the pressure. The heating water passing through the water separator 24 is supplied to the latent heat exchanger 16 through the line L2 by the operation of the circulation pump 22, and then heated while passing through the sensible heat exchanger 14. Discharged to (L3). Heating water discharged through the line (L3) is supplied to the room according to the operation of the three-way valve (28).

In the middle of the boiler, a heat exchanger for obtaining hot water using heat of heating water is illustrated. In accordance with the operation of the hot water flow switch 36, the cold water introduced through the line (L6) is heated in the process of passing through the hot water heat exchanger 34, and then discharged through the line (L7).

In addition, a gas supply device is installed at the lower right side of the boiler. According to the operation of the gas valve 44, the gas introduced through the line L8 is supplied to the nozzle 8 above the combustor 4 through the line L9. At this time, the supply amount of gas is varied according to the operation of the air proportional control solenoid valve 46 to compensate for the supply amount according to the change of the outside air. The gas thus supplied is ignited and combusted by the spark delivered through the ignition transformer 42 and the ignition rod. This series of combustion processes the controller 40 receiving the input signal from the room temperature controller 38 operated by the user. Controlled by

The condensing method as described above includes a sensible heat exchanger that directly heats the heating water by using the heat burned by the burner, and a latent heat exchanger that heats the heating water by using the latent heat of condensation of the exhaust gas passing through the sensible heat exchanger. And a non-condensing method is provided with a sensible heat exchanger only.

Heat exchangers configured to absorb only sensible heat have used copper heat exchangers with high heat conduction effects because they do not need to take into account the function of wet conditions occurring during condensation.

However, in the case of a heat exchanger configured to absorb sensible and latent heat, a condensation process is performed inside, so that the latent heat absorbing part is in a humid environment, and this humid environment is changed from a gas to a liquid by condensation of water vapor in the combustion exhaust gas.

This change to liquid is called condensate, and this condensate will corrode metals that are not acid resistant. Therefore, it became the biggest problem in the durability of a boiler. In addition, even in the case of the copper material used mostly in the heat exchanger that absorbs only sensible heat, the thermal conductivity is excellent, but when the condensation condition is the same as the above corrosion occurs, the durability of the heat exchanger was reduced.

In addition, the heat exchanger is made of aluminum or stainless steel that can absorb sensible and latent heat and has corrosion resistance. Since the thermal conductivity is lower than that of the copper material, it is necessary to obtain the same or similar amount of heat as a boiler formed of copper. Compared with the heat exchanger to form a larger size and weight was a problem that is heavy.

Therefore, in order to make up for the disadvantage that the size becomes large and the weight becomes heavy, the sensible heat part, which is a heat exchange part that absorbs sensible heat in the heat exchanger, is made of copper material having good thermal conductivity, and the heat condensing part, which is a heat exchange part that absorbs latent heat of condensation, is a concern. Although it is composed of aluminum or stainless steel of corrosion resistant material, it has a double structure, but there is a restriction on corrosion prevention in design so that the heat exchange part formed of copper is not placed in the condensation condition, and the sensible heat part formed of copper material The condensation heat exchanger made of stainless steel and aluminum must be designed to maintain the dew point temperature or more so that the temperature of the contact portion does not lie in the condensation condition.

That is, the heat exchangers of the conventional boiler as described above were not formed to be small and light, but to have corrosion resistance and high thermal efficiency.

The present invention has been made in view of this point, an object of the present invention is to provide a condensing heat exchanger of a gas boiler that can be miniaturized and lightened by maximizing the efficiency of the heat exchanger in the overall structure of the heat exchanger.

1 is a view showing the overall configuration of a condensing gas boiler having a typical sensible heat portion and a latent heat portion,

2 is a view showing the overall configuration of a condensing gas boiler having a heat exchanger according to the present invention,

3 is an enlarged cross-sectional view of the heat exchanger of the present invention;

4 is a view showing the coupling of the heat exchanger and the side cap of the present invention.

Explanation of symbols on the main parts of the drawing

110: heat exchanger 101: blower

102: burner 103: fuel inlet

104: combustion chamber 105: exhaust duct

106: drain siphon 107: exhaust port

108: case 110: sensible heat exchanger

111: sensible heat exchange pipe 112: sensible heat / latent heat exchange

113: sensible heat / latent heat exchange pipe 114: latent heat exchanger

115: latent heat exchange pipe 116: heat shield

117: heat radiation absorption exchange pipe 118: heat exchange circuit cap

119: slope 120: sensible heat exchange pin

Condensing heat exchanger of the gas boiler of the present invention for achieving the above object and a gas burner for generating a spark by igniting the gas supplied to the gas supply pipe to the inside of the heat exchanger case with a spark plug; In the heat exchanger of the gas boiler to form a heat exchanger portion for heating the fluid moving through the pipe by the heat generated from the flame of the gas burner to the lower side of the gas burner, the fluid inward to heat the fluid using a hot combustion gas Forms a large number of sensible heat exchange pipes

A sensible heat exchanger protruding in the longitudinal direction of the sensible heat exchange pipe and having a sensible heat exchange pin formed integrally with the sensible heat exchange pipe and installed below the burner; Forming a plurality of sensible heat / latent heat exchange pipe to heat the fluid moving inside by using the sensible heat and the latent heat of condensation, and the sensible heat / latent heat exchange unit installed in the lower portion of the sensible heat exchange unit; A plurality of latent heat exchange pipes formed to form a plurality of latent heat exchange pipes, and installed below the sensible heat / latent heat exchange part; A heat dissipation blocking wall formed in the case at a predetermined distance along an inner surface of the case; The heat dissipation absorption heat exchange pipes are installed in contact with the inner wall of the heat dissipation blocking wall.

The case may be provided with a heat exchange circuit cap having a flow passage in communication with the sensible heat exchange pipe, sensible heat / latent heat exchange pipe, latent heat exchange pipe and heat dissipation absorption heat exchange pipe.

In addition, the latent heat exchange pipe is formed by installing a plurality of smaller than the sensible heat exchange pipe.

EMBODIMENT OF THE INVENTION Hereinafter, the structure of this invention is demonstrated in detail based on an accompanying drawing.

2 is a view showing the overall configuration of the condensing gas boiler having a heat exchanger according to the present invention, Figure 3 is a cross-sectional view showing an enlarged heat exchanger of the present invention,

4 is a view showing the coupling of the heat exchanger and the side cap of the present invention.

As shown in the drawing, the gas boiler of the present invention is provided with a blower 101 at the top and a burner 102 at the bottom thereof to mix gas (or liquid fuel) and air introduced through the fuel inlet 103. After the combustion chamber 104 is ignited, to be burned, the lower part of the heat exchanger 100 having a characteristic configuration of the present invention is installed, the heat exchange occurs and the lower the lower the heat of combustion generated in the gas burner as the lower Condensation occurs at the design point of the, and at the bottom of the exhaust duct 105 is installed to discharge the condensate generated in the heat exchange process to the drain siphon 106 and the remaining exhaust gas to the outside through the exhaust port (107).

That is, the cold fluid flows from the lower part of the heat exchanger, and the fluid passes sequentially from the lower part of the heat exchanger to the upper part through the heat exchanger circuit to absorb heat generated from the gas burner.

In particular, the heat exchanger 100 having a characteristic configuration of the present invention includes a gas burner 102 generating sparks by igniting the gas supplied to the gas supply pipe into the heat exchanger case 108 with an ignition plug; In the heat exchanger of the gas boiler to form a heat exchanger portion for heating the fluid moving through the pipe by the heat generated from the flame of the gas burner 102 to the lower side of the gas burner 102,

A plurality of sensible heat exchange pipes 111 in which the fluid moves inward to heat the fluid by using hot combustion gas, protrude in the longitudinal direction of the sensible heat exchange pipe and integrally formed with the sensible heat pipe A sensible heat exchanger (110) provided at a lower portion of the gas burner (102);

A sensible heat / latent heat exchanger (112) for forming a plurality of sensible heat / latent heat exchange pipes (113) to heat the fluid moving inside by using sensible heat and latent heat of condensation, and installed below the sensible heat exchange (110) part;

A plurality of latent heat exchange pipes 115 formed to heat the fluid inside by using the latent heat of condensation, and installed at a lower portion of the sensible heat / latent heat exchanger 112;

A heat dissipation blocking wall formed at a predetermined distance from the inner surface of the case 108 along the inner side of the case 108 surrounding the sensible heat exchanger 110, the sensible heat / latent heat exchanger 112, and the latent heat exchanger 114. 116;

A heat radiation absorption heat exchanger pipe 117 is installed to be in contact with the inner surface of the heat radiation blocking wall 116.

In addition, the heat exchanger 100 of the present invention is based on the overall configuration of the stainless steel, in particular the sensible heat exchange unit 110, sensible heat / latent heat exchange unit 112, and the sensible heat exchange unit 110 And a portion of the heat-absorbing heat-absorbing heat exchanger pipe 117 installed next to the sensible heat / latent heat exchange unit 112 may be formed of aluminum or copper.

The case 108 is provided with a heat exchange circuit cap 118 having a flow path in communication with the sensible heat exchange pipe 111, the sensible heat / latent heat exchange pipe 113, the latent heat exchange pipe 115 and the heat dissipation absorption heat exchange pipe 117. Can be.

In addition, the latent heat exchange pipe 115 is formed by installing a plurality of smaller than the sensible heat exchange pipe (111).

The lower portion of the heat dissipation blocking wall 116 is preferably formed as an inclined surface 119 to facilitate drainage of condensate.

Referring to the operation of the present invention having such a configuration as follows.

First, the high temperature combustion gas generated in the combustion chamber 104 heats the fluid inside the sensible heat exchange pipe 111 in the sensible heat exchange unit 110, and the sensible heat exchange pin 120 is the length of the sensible heat exchange pipe 111. Protruding in the direction and integrally formed with the sensible heat exchange pipe 111 to facilitate the exchange of sensible heat to maximize the heat exchange efficiency, and then in the sensible heat / latent heat exchange pipe 113 in the sensible heat / latent heat exchange pipe 113 The fluid is heated, and the fluid of the latent heat exchange pipe 115 is heated again by the latent heat exchanger 114 to be condensed water and exhaust gas, which is then sent to the exhaust duct 105. That is, the heat exchanger 100 of the present invention is composed of a sensible heat exchanger 110, a sensible heat / latent heat exchanger 112, a latent heat exchanger 114 and a heat radiation absorption heat exchanger pipe 117, unlike the conventional dual structure, In addition, the heat radiation absorption heat exchange pipe 117 again absorbs sensible heat radiated to the outside through the case 108, thereby expanding the heat transfer area and maximizing the heat exchange efficiency of the combustion gas and the fluid.

Therefore, the present invention can form a whole structure of the heat exchanger 100 made of stainless steel to realize high efficiency heat exchange while maintaining good corrosion resistance, it is possible to form a compact and lightweight product. In the present invention, if necessary, the sensible heat exchanger 110, the sensible heat / latent heat exchanger 112, and the heat radiation absorption heat exchanger pipe 119 installed next to the sensible heat exchanger 110 and the sensible heat / latent heat exchanger 112. The upper part of the upper part may be formed of aluminum or copper to further improve heat exchange efficiency.

Meanwhile, the heat exchanger 100 of the present invention forms an inclined surface 119 under the case 108 and the heat dissipation blocking wall 116 in order to easily realize drainage of the condensate. On the other hand, the case 108 of the present invention is a separate heat exchanger having a flow path in communication with the sensible heat exchange pipe 111, sensible heat / latent heat exchange pipe 113, the latent heat exchange pipe 115 and the heat dissipation absorption heat exchange pipe 117 By installing the circuit cap 118, the effective heat exchange is to be configured.

Therefore, as described above, the present invention forms a three-stage heat exchanger to absorb sensible heat, sensible heat / latent heat, and latent heat, and installs a heat-absorbing heat exchanger pipe for further blocking and reusing heat emitted to the case wall. It is possible to realize high efficiency heat exchange by maximizing latent heat absorption rate. In particular, since the sensible heat exchange fin is additionally formed, and the maximum number of latent heat exchange pipes are accommodated, the heat exchange area is widened to improve heat exchange efficiency, and according to the present invention, light weight and compactness can be realized while using stainless steel. In addition, there is an advantage in that the effect of improving the heat exchange efficiency of the gas boiler can be obtained.

Claims (3)

In the heat exchanger of the gas boiler formed to the lower side of the gas burner to heat the fluid moving through the pipe with the heat generated from the gas burner ignited by the spark plug to ignite the gas supplied through the gas supply pipe, A plurality of sensible heat exchange pipes in which the fluid moves inward to heat the fluid by using a high temperature combustion gas, and a sensible heat exchange pin integrally formed with the sensible heat exchange pipe so as to protrude in the longitudinal direction of the sensible heat exchange pipe; And a sensible heat exchanger installed at the lower portion of the burner; A sensible heat / latent heat exchanger that forms a plurality of sensible heat / latent heat exchange pipes to heat the fluid moving inside by using sensible heat and latent heat of condensation and is installed below the sensible heat exchanger; A plurality of latent heat exchange pipes formed to form a plurality of latent heat exchange pipes to heat the fluid inside by using the latent heat of condensation, and installed below the sensible heat / latent heat exchange part; A heat dissipation blocking wall formed in the case at a predetermined distance along an inner surface of the case; Condensing heat exchanger of the gas boiler, characterized in that consisting of heat radiation absorption heat exchanger pipes installed in contact with the inner wall of the heat shield. The condensing heat exchanger of claim 1, wherein the sensible heat exchange fin is formed of stainless steel. The condensing heat exchanger of claim 1, wherein the latent heat exchange pipe is formed in a larger number with a smaller diameter than the sensible heat exchange pipe.