KR19990070599A - Dual structure heat exchanger for condensing gas boiler - Google Patents

Abstract

The present invention is a dual structure heat exchanger that can improve the thermal efficiency in the condensing gas boiler, which is used by integrating the sensible heat exchanger of the upper portion and the latent heat exchanger of the lower portion is discharged to the outside by the bath gas from the gas boiler is lost. The present invention relates to a dual-structure heat exchanger for condensing gas boilers that can save energy by using energy, and includes a heat-sensing portion fin (3) that absorbs sensible heat by brazing around a heat exchange pipe (9) arranged up and down and a heat medium. And an upper and lower heat exchanger unit 1, which is composed of a heat exchanger pipe 9 for absorbing sensible heat from the external heat sinker fin 3 and transferring it to the heat medium and absorbing the combustion sensation generated by the burner 8; The latent heat portion fin 4 which is brazed and welded around the heat exchange pipe 10 to absorb latent heat, and the heat medium flows inside the latent heat It is composed of a heat exchange pipe (10) for absorbing latent heat from the fin (4) to transfer to the heat medium, the lower latent heat exchanger to absorb the residual heat of the sensible heat and the condensation latent heat generated during condensation Dual structure heat exchanger for condensing gas boiler, characterized in that provided with (2).

Description

Dual structure heat exchanger for condensing gas boiler

The present invention relates to a dual-structure heat exchanger that can improve the thermal efficiency in the condensing gas boiler, and more particularly, the sensible heat exchanger of the upper portion and the latent heat exchanger of the lower portion is used to integrate the exhaust gas from the gas boiler to the outside. The present invention relates to a dual structure heat exchanger for a condensing gas boiler that can save energy by using energy released and lost.

In general, the gas boiler for domestic hot water boiler is configured to ignite the gas supplied through the gas supply pipe through the main burner by the ignition transformer, and a heat exchanger is installed so that the rooftop water tank or hot water circulation is supplied through the water supply and heating pipe. A pump is installed.

Here, the heat exchanger is a device for transferring two fluids having different temperatures to each other with a heat transfer plate therebetween to transfer the heat of the high temperature fluid to the low temperature fluid.

By the way, the thermal efficiency of the gas boiler is typically about 75%-80%, the remaining 20%-25% is the loss by the exhaust gas.

Therefore, it is possible to recover the heat carried by the exhaust gas. One of the methods of recovering the heat taken out by the exhaust gas is a condensing heat exchange technology. A heat exchanger is installed in a passage through which the exhaust gas exits to condense the exhaust gas to recover heat, thereby minimizing heat loss. To do this, the condensing heat exchanger must have several conditions. The most problematic part is the corrosion of heat exchanger components due to sulfur oxides and nitrogen oxides in the condensate with acid groups generated during condensation and the exhaust gas components generated during gas fuel combustion. To prevent.

That is, most of the condensing heat exchanger is composed of a single material for manufacturing reasons, so the material of each part constituting the heat exchanger is composed of the same material. However, since the constituent circuit of the heat exchanger pipe in which the heat medium flows inside the heat exchanger is sequentially formed from below, the temperature of the exhaust gas is lowered in the sensible heat part, and condensation may occur. There is a drawback that it occurs. In the integrated heat exchanger, corrosion resistance is ensured to ensure corrosion resistance of the heat exchanger components by sulfur oxides and nitrogen oxides in condensed water having an acid group of pH 3-4 generated during latent heat recovery and exhaust gas components generated during combustion. Integrate the heat exchanger with a material such as aluminum alloy or stainless steel.

Therefore, by integrating the heat exchanger with a material such as aluminum alloy or stainless steel, which is a material having corrosion resistance as described above, the size of the heat exchanger is increased and the weight is heavy, thereby inhibiting compactness in the domestic gas boiler.

In addition, in the case of aluminum material, the welding process becomes difficult, and the production by casting and machining brings about an increase in the manufacturing cost and the complexity of the structure.In the case of the stainless material, the machinability is difficult and the welding also requires high technology. There was a difficult problem in production.

The present invention has been invented to solve the corrosion problems of the conventional heat exchanger components as described above, the condensing heat exchanger is made of stainless material and the sensible heat exchanger is made of the same material to maximize the thermal conductivity and heat absorption rate It is an object of the present invention to provide a dual structure heat exchanger for condensing gas boilers in which heat exchange circuits are constructed so that the sensible heat exchanger can maintain a dew point temperature or more.

1-a perspective view showing a dual structure heat exchanger for a condensing gas boiler according to an embodiment of the present invention,

2 is a configuration diagram illustrating a dual structure heat exchanger for a condensing gas boiler according to the present invention;

3 is a view showing an operating state of the dual structure heat exchanger for the condensing gas boiler shown in FIG.

Explanation of symbols for main parts of the drawings

1: sensible heat exchanger 2: latent heat exchanger

3: sensible heat part fin 4: latent heat part fin

5: heat exchange pipe 6: blower

7: blower motor 8: burner

The dual structure heat exchanger for condensing gas boilers of the present invention for achieving the above object is a sensible heat fin (3) for absorbing sensible heat by brazing welding around the heat exchange pipe (9) arranged up and down and the heat medium flows inside and An upper sensible heat exchanger (1) configured to absorb sensible heat from the sensible heat fin (3) and transfer it to the heat medium and absorb the combustion sensible heat generated by the burner (8); Braze welding around 10) absorbs latent heat, and the heat medium flows through the latent heat portion fin 4 and the heat transfer pipe 10 which absorbs the latent heat from the external latent heat portion fin 4 and transfers it to the heat medium. The sensible heat exchanger 1 is characterized in that it is provided with a latent heat exchanger (2) for absorbing the residual heat of sensible heat and the latent heat of condensation generated during condensation.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a perspective view showing a dual structure heat exchanger for a condensing gas boiler according to an embodiment of the present invention, the present invention is a double structure heat exchanger that can improve the thermal efficiency in the condensing gas boiler, which is the upper sensible heat exchanger Since the (1) and the latent heat exchanger (2) in the lower portion are used together, it is configured to save energy by using the energy lost to the outside by the exhaust gas from the gas boiler.

First, the upper sensible heat exchanger 1 absorbs the combustion sensible heat generated from the burner 8, which is a sensible heat fin 3 that absorbs sensible heat by brazing around the heat exchange pipe 9 arranged up and down. And heat exchange pipe (9) which absorbs sensible heat from the external heat-sensing part fin (3) and transmits it to the heat medium, while being produced by copper brazing.

The lower latent heat exchanger (2) absorbs the residual heat of the sensible heat that has completed heat exchange in the sensible heat exchanger (1) and the latent heat of condensation generated during condensation, which is brazed around the heat exchange pipe (10) arranged up and down. It consists of a latent heat portion fin 4 welded to absorb latent heat and a heat medium flowing therein, and a heat exchange pipe 10 that absorbs latent heat from an external latent heat portion pin 4 and transfers it to the heat medium, and is manufactured by stainless steel processing. .

Therefore, the dual structure heat exchanger for condensing gas boiler of the present invention absorbs the combustion heat generated during burner combustion and transfers it to the heat medium, so that the double heat exchanger 1 is configured as a sensible heat exchanger 1 at the top and a latent heat exchanger 2 at the bottom. The sensible heat exchanger 1 for absorbing sensible heat is made of copper to optimally secure thermal conductivity and heat absorption rate, and the latent heat exchanger 2 for absorbing latent heat is made of stainless oxides of condensate and combustion exhaust gas components. Corrosion resistance can be ensured from corrosion by nitrogen oxides or the like. On the sensible heat exchange part 1, a combustion chamber heat exchange pipe 5 of the same material is wound.

FIG. 2 is a configuration diagram illustrating a dual structure heat exchanger for condensing gas boilers according to the present invention. As shown in FIG. 1, a condensing heat exchanger configured as double as an upper sensible heat exchanger 1 and a lower latent heat exchanger 2 is shown in FIG. 1. A burner (8) for mixing and combusting combustion gas and air under combustion optimum conditions, a blower motor (7), and a blower for supplying combustion air for combustion and for exhausting the exhaust gas generated by combustion (6). It is a heat exchange diagram connected to). In the combustion chamber 11 between the burner 8 and the sensible heat exchanger 1, the combustion chamber heat exchange pipe 5 is wound, and a gas nozzle 12 is installed in the burner 8 to supply gas.

That is, in order to absorb the high temperature of 700-1200 ° C generated during combustion in the burner 8, the sensible heat exchanger 1 made of the same high thermal conductivity material and the 130-degree heat exchanged from the sensible heat exchanger 1 after completion of heat exchange. It consists of a latent heat exchanger (2) made of stainless material having corrosion resistance under the dew point temperature to absorb residual heat of sensible heat at 200 ° C and condensation heat generated during condensation, respectively. The heat exchange unit 2 is a structure that is manufactured in a structure independent from each other and assembled during system configuration.

The sensible heat exchanger 1 is located in the combustion chamber 11 in contact with the burner (8) surface, around the combustion chamber 11 in the wall surface of the combustion gas of the high temperature (700-1200 ℃) generated during burner combustion In order to prevent heat dissipation heat loss and overheating of the wall surface, a heat exchange pipe 5 is provided, and a heat exchange pipe 9 is provided at the lower surface, that is, in contact with the latent heat exchanger 2, and the heat exchange pipe 9 is provided. A large number of sensible heat part pins 3 are brazed and welded to absorb sensible heat (burning heat) generated in a burner combustion chamber.

In the latent heat exchanger 2, the heat exchanger pipe 10 is installed in the same contact with the sensible heat exchanger 1 and the latent heat buoy 4 is installed around the sensible heat exchanger. And it absorbs the latent heat of condensation generated during condensation and the condensate generated in the condensation process is discharged to the outside through the exhaust duct 13 of the lower portion. The exhaust duct 13 has an exhaust temperature of 30 to 80 ° C.

The dual structure heat exchanger for condensing gas boilers of the present invention configured as described above is made of the same material as the sensible heat exchanger 1 and the latent heat exchanger 2 is made of stainless steel. It enters into the lower part of the heat exchanger 2 and sequentially exchanges heat to absorb latent heat due to condensation, enters the upper heat exchange pipe 5 of the combustion chamber 11 of the sensible heat exchanger 1 and performs heat exchange to absorb sensible heat, The circuit is configured to absorb sensible heat while passing through the heat exchange pipe 9 of the sensible heat exchanger pin 3 of the sensible heat exchanger 1 so that the sensible heat exchanger 1 made of the same material is at or above the dew point temperature. Corrosion resistance is secured from corrosion.

As shown in FIG. 3, the sensible heat exchanger 2 sequentially moves the latent heat exchanger 1 from the bottom of the upper combustion chamber 11 wall surface, as shown in FIG. 3. Since the exhaust gas temperature at the portion where the sensible heat exchanger 1 and the latent heat exchanger 2 are in contact with each other is maintained above the dew point temperature, the sensible heat exchanger 1 is made of the same material. To ensure corrosion resistance and to ensure maximum thermal conductivity and heat absorption to absorb sensible heat, the latent heat exchanger (2) is a stainless material to absorb the latent heat generated when condensation and ensure corrosion resistance.

Therefore, the heat medium (usually water) flow order inside the heat exchange pipes 5, 9, and 10 of the dual structure condensing heat exchanger including the sensible heat exchanger 1 and the latent heat exchanger 2 is made of the same material. The circuit is configured to maintain the sensible heat exchanger 1 (where it is in contact with the latent heat exchanger 2) above the dew point temperature in order to protect it from corrosion that may occur during heat exchange.

That is, the cold heat medium enters the pipe (a), which is the lower heat exchange pipe (10) of the latent heat exchanger (2), and the heat medium passing through the pipe (g) sequentially passes through the sensible heat exchanger (1) upper combustion chamber (11). By absorbing sensible heat in the pipe hk, which is a heat exchange pipe 5 wound around by brazing welding, heat exchanges through a pipe lr, which is a heat exchange pipe 9 of the sensible heat exchanger 1, to obtain a hot heat medium.

At this time, the lower end of the sensible heat exchanger 1, that is, the contact with the upper end of the latent heat exchanger 2, the exhaust temperature during heat exchange is 130-200 ℃, it can be safe from corrosion because it maintains more than the dew point temperature.

As described above, according to the present invention, in order to prevent corrosion phenomenon of the conventional heat exchanger components, the condensing heat exchanger is made of stainless material, and the sensible heat part is made of the same material to maximize the thermal conductivity and the heat absorption rate. A dual structure heat exchanger for condensing gas boilers having a heat exchange circuit configured to maintain an additional dew point temperature may be provided.

In addition, the dual structure heat exchanger for condensing gas boilers of the present invention has the advantage of using energy that is discharged to the outside by the exhaust gas in the gas boiler and used to save energy by using the condensing heat exchanger in practical use.

Since the present invention can increase the energy use efficiency, the energy consumption can be reduced to reduce the emission of environmentally harmful substances.

Claims (2)

Brazing welding around the heat exchange pipe (9) arranged up and down and the heat exchanger fin (3) to absorb sensible heat and the heat medium flows inside, and the heat exchanger pipe absorbs sensible heat from the external sensible heat fin (3) and transfers it to the heat medium ( 9) an upper sensible heat exchanger 1 configured to absorb combustion sensible heat generated by the burner 8, and a latent heat part fin 4 for brazing welding absorbing latent heat around the heat exchange pipe 10 arranged up and down. The heat medium flows through the inside and the heat exchange pipe 10 which absorbs latent heat from the external latent heat portion fins 4 and transfers the heat medium to the heat medium. Dual structure heat exchanger for condensing gas boiler, characterized in that provided as a latent heat exchanger (2) of the lower portion to absorb the latent heat of condensation. The sensible heat exchanger (1) is made of the same material and the latent heat exchanger (2) is made of stainless material, and the heat medium having the heat exchanger circuit configuration of the heat medium is introduced into the lower part of the latent heat exchanger (2) to condense heat sequentially. Absorbs latent heat, enters the heat exchange pipe (5) above the combustion chamber (11) of the sensible heat exchange part (1), performs heat exchange, absorbs sensible heat, and heat exchanges the sensible heat part fin (3) of the sensible heat exchange part (1) again. The circuit for absorbing sensible heat while passing through (9), so that the sensible heat exchanger (1) made of the same material is at or above the dew point temperature to ensure corrosion resistance from corrosion due to condensation. Structure heat exchanger.