KR100406132B1 - Upper burning type condensing gas boiler - Google Patents

Abstract

The present invention relates to an upward combustion condensing gas boiler, the present invention comprising: a burner which mixes and combusts the gas introduced through the gas valve with air to provide combustion heat in the combustion chamber; A blower for supplying a predetermined amount of air to the burner; A sensible heat exchanger that directly heats the heating water by the combustion heat of the burner in the combustion chamber; In the condensing gas boiler comprising a latent heat exchanger for heating the heating water by the latent heat of the exhaust gas through heat exchange with the exhaust gas generated in the combustion chamber, the combustion chamber is provided with a combustion chamber wall consisting of an inner diaphragm and an outer diaphragm, The sensible heat exchanger and the latent heat exchanger are integrally formed by a stainless corrugated pipe wound up one line along the combustion chamber wall, and a latent heat exchanger is disposed below the sensible heat exchanger, and the burner and the blower are arranged at the bottom of the combustion chamber. The sensible heat exchanger and the latent heat exchanger are sequentially installed under the sensible heat exchanger so that upward combustion is possible, and an exhaust duct having an exhaust port for discharging exhaust gas to the outside of the outer diaphragm of the combustion chamber is installed and toward the lower side of the combustion chamber. Condensation to drain condensate It is characterized in that the water outlet is provided.

Description

Upper burning type condensing gas boiler

The present invention relates to an upward combustion condensing gas boiler, and more specifically, by winding up a stainless corrugated pipe without heat exchange fins along the combustion chamber wall, the sensible and latent heat exchangers can be easily integrated with each other, and the upward combustion is possible. It relates to an upward combustion condensing gas boiler in which condensate flows in the same direction as the exhaust gas.

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.

The gas boiler is configured to ignite the gas supplied through the gas supply pipe through the main burner by an ignition transformer, and a heat exchanger is installed inside the gas boiler, and a rooftop water tank or a hot water circulation pump through a water supply and heating pipe. Etc. are installed.

However, the thermal efficiency of the gas boiler is typically about 75% to 80%, and the remaining 20% to 25% is a loss due to the exhaust gas.

Therefore, one of the methods of recovering the heat of the exhaust gas is a condensing heat exchange technique. The condensing heat exchange technique is provided with a regenerative heat exchanger in a passage through which the exhaust gas exits to condense the exhaust gas to recover heat. It is to be minimized.

As such, the gas boiler may be classified into various types according to a control method or a sealed state, but may be classified into condensing and non-condensing types according to heat sources for heating heating water.

Among them, the condensing method has a latent heat exchanger that heats the heating water by using latent heat of exhaust gas passing through the sensible heat exchanger, together with a sensible heat exchanger that directly heats the heating water by using the heat burned by the burner. The non-condensing method is provided only with the sensible heat exchanger.

The condensing gas boiler mainly uses the same copper material in consideration of thermal efficiency, but in the heat exchanger, corrosion occurs due to sulfuric acid, nitrogen oxide, and combustion heat in the exhaust gas and acidic water generated during condensation. Recently, aluminum or stainless steel with corrosion resistance is mainly used.

The condensing gas boiler is configured to use a downward combustion method in which gas moves downward to supply heat, and an upward combustion gas boiler in which heat moves upward.

Here, the configuration of a gas boiler of the conventional general condensing method will be described.

1 is a block diagram showing a gas boiler of the conventional downward combustion condensing method.

In the gas boiler illustrated here, the air blower 110 and the burner 120 are disposed on the upper part of the combustor 100 in an air proportional control method in which a certain amount of air is always supplied by adjusting the air amount according to the temperature change of the outside air. It is.

The upper part of the combustor 100 is provided with a burner 120 for burning the air and gas sucked through the intake duct 130 in accordance with the operation of the blower 110, the sensible heat portion in turn under the burner 120 The heat exchanger 140 and the latent heat exchanger 160 are disposed.

The sensible heat exchanger 140 heats the heating water in the process of exchanging heat by directly contacting the sensible heat generated from the burner 120, the latent heat exchanger 160 is generated when the heat contact with the exhaust gas The latent heat is used to heat the heating water.

In addition, the exhaust gas passing through the latent heat exchanger 160 is discharged to the outside through the exhaust duct 150, and condensed water generated in the heat exchange process is collected in the exhaust hood 180 and then discharged to the outside.

In addition, a circulation pump 170 for circulating the heating water is disposed at the lower left side of the boiler.

When the circulation pump 170 is operated, the heating water which has finished heating in the room is introduced into the heating water filter 190 through the line L1.

The heating water filter 190 removes impurities contained in the heating water, and the filtered heating water is sent to the upper water separator 200.

The water separator 200 is for discharging the air contained in the heating water, it is to discharge the air through the upper air vent.

At this time, an overpressure preventing valve 210 is installed between the heating water filter 190 and the water separator 200 to prevent the pressure of the heating water from being excessively increased, thereby expanding a part of the heating water into the expansion tank 220. To control the pressure.

The heating water passing through the water separator 200 is supplied to the latent heat exchanger 160 through line L2 by the operation of the circulation pump 170 and then heated while passing through the sensible heat exchanger 140. Discharged to line L3.

Thus, the heating water discharged through the line (L3) is supplied to the room according to the operation of the three-way valve 230.

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 240, the cold water introduced through the line (L4) is heated in the process of passing through the hot water heat exchanger 250, and then discharged through the line (L5).

In addition, a gas supply device is installed at the lower right side of the boiler.

According to the operation of the gas valve 260, the gas introduced through the line L6 is supplied to the nozzle 270 above the combustor 100 through the line L7.

At this time, the supply amount of gas is changed according to the operation of the air proportional control solenoid valve 280 to compensate for the supply amount according to the change of the outside air.

The gas supplied is ignited and combusted by a spark delivered through the ignition transformer 290 and the ignition rod, and this series of combustion processes the controller 310 receiving an input signal from the indoor temperature controller 300 operated by a user. Controlled by

Thus, the conventional condensing gas boiler is provided with a heat exchanger having a dual structure that can improve the thermal efficiency, which is used to integrate the sensible heat exchanger 140 and the latent heat exchanger 160 of the lower portion. Therefore, it is configured to save energy by using energy that is discharged and lost by the exhaust gas from the gas boiler to the outside.

In this case, the upper sensible heat exchanger 140 absorbs the combustion sensible heat generated from the burner 120, which is sensible heat brazed around the sensible heat exchange pipe arranged vertically in the sensible heat exchanger 140. It absorbs sensible heat from the heat exchange fins and transfers it to the heat medium flowing inside the sensible heat exchange pipe.

In addition, the lower latent heat exchanger 160 absorbs the residual heat of the sensible heat completed after the heat exchange in the sensible heat exchanger 140 and the latent heat of condensation generated by condensation, which is applied to the latent heat exchanger 160. It is made through the process of absorbing the latent heat from the latent heat exchanger fin, which is brazed and welded around the upper and lower latent heat exchange pipes, to absorb the latent heat.

However, in the case of the conventional condensing gas boiler as described above, since the sensible heat portion and the latent heat portion are manufactured separately, there is a problem in that the structure is complicated and the manufacturability is reduced, and the heat exchange fins are brazed on the outer circumferential surfaces of the sensible and latent heat exchanger. There is a problem that the manufacturing process is complicated to be formed by welding.

In addition, the heat exchanger used in the condensing gas boiler is not capable of upward combustion and can be used only in the downward combustion, and the heat exchangers of the conventional condensing gas boiler are not formed to have a small, light and high thermal efficiency.

The present invention has been made in view of the above problems in order to more effectively solve the problem, the object of the present invention by winding a stainless corrugated pipe that does not require heat exchange fins along the combustion chamber wall, the sensible and latent heat exchanger integrally A simple combustion and upstream combustion condensing gas boiler is provided to allow condensate to flow in the same direction as the exhaust gas.

1 is a configuration diagram for explaining the overall configuration of a conventional downward combustion condensing gas boiler,

2 is a cross-sectional view showing the configuration of the upstream combustion condensing gas boiler according to the present invention;

Figure 3 is a side view showing a state in which the stainless corrugated pipe constituting the sensible heat portion and the latent heat portion heat exchanger according to the present invention,

Figure 4 is a bottom view showing a state in which the stainless steel corrugated pipe constituting the sensible heat portion and the latent heat portion heat exchanger according to the present invention.

* Description of the symbols for the main parts of the drawings *

10 combustion chamber 11: inner diaphragm

12: outer diaphragm 20: blower

30: burner 31: gas valve

40: sensible heat exchanger 50: latent heat exchanger

41,51: stainless corrugated pipe 60: exhaust duct

61: exhaust port 70: condensate outlet

80: heating water inlet 81: heating water outlet

90, 91: heat insulating material H: heat exchanger

W: combustion chamber wall

According to an aspect of the present invention, there is provided an upward combustion condensing gas boiler comprising: a burner configured to combust and mix gas introduced through a gas valve with air to provide combustion heat in a combustion chamber; A blower for supplying a predetermined amount of air to the burner; A sensible heat exchanger that directly heats the heating water by the combustion heat of the burner in the combustion chamber; In the condensing gas boiler comprising a latent heat exchanger for heating the heating water by the latent heat of the exhaust gas through heat exchange with the exhaust gas generated in the combustion chamber, the combustion chamber is provided with a combustion chamber wall consisting of an inner diaphragm and an outer diaphragm, The sensible heat exchanger and the latent heat exchanger are integrally formed by a stainless corrugated pipe wound up one line along the combustion chamber wall, and a latent heat exchanger is disposed below the sensible heat exchanger, and the burner and the blower are arranged at the bottom of the combustion chamber. The sensible heat exchanger and the latent heat exchanger are sequentially installed under the sensible heat exchanger so that upward combustion is possible, and an exhaust duct having an exhaust port for discharging exhaust gas to the outside of the outer diaphragm of the combustion chamber is installed and toward the lower side of the combustion chamber. Condensation to drain condensate It is characterized in that the water outlet is provided.

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

2 is a cross-sectional view showing a configuration of the upstream combustion condensing gas boiler according to the present invention, Figure 3 is a side view showing a state in which the stainless corrugated pipe constituting the sensible heat portion and the latent heat portion heat exchanger according to the present invention, Figure 4 is a bottom view showing a state in which the stainless corrugated pipe constituting the sensible heat portion and the latent heat portion heat exchanger according to the present invention.

As shown in FIG. 2, the condensing gas boiler according to the present invention has an upward combustion configuration.

That is, in the condensing gas boiler according to the present invention, a blower 20 is installed at the lower end of the combustion chamber 10, and a burner 30 is installed above the blower 20 to flow through the gas valve 31. After mixing gas and air, it is comprised so that the combustion chamber 10 may be ignited and combusted.

In addition, an upper part of the burner 30 is provided with a heat exchanger H in which the sensible heat exchanger 40 and the latent heat exchanger 50, which is a characteristic configuration of the present invention, are integrally installed. It is configured to receive heat exchange.

In addition, as descending to the lower portion of the combustion chamber 10, the heat of combustion generated from the burner 30 is indirectly contacted instead of directly contacting, and condensation occurs at an arbitrary design point, and toward the bottom of the combustion chamber 10. By installing the exhaust duct 60 and the condensate outlet 70 to discharge the condensate generated during the heat exchange process to the condensate outlet 70, the remaining exhaust gas through the exhaust port 61 provided on the exhaust duct 60 It is configured to discharge to the outside.

That is, cold fluid (heating water) flows in from the lower part of the heat exchanger H, and the fluid passes through the inside of the combustion chamber 10 through the conduit of the heat exchanger H from the lower part of the heat exchanger H to the upper part in sequence. While absorbing the combustion heat generated by the burner (30).

Here, the arrangement of the components constituting the condensing gas boiler according to the present invention will be described in more detail as follows.

The combustion chamber 10 is provided to have a substantially rectangular cross section. The combustion chamber 10 is configured to be surrounded by a combustion chamber wall W formed of an inner diaphragm 11 and an outer diaphragm 12.

At this time, the outer diaphragm 12 is formed to cover the entire combustion chamber 10, the inner diaphragm 11 is a predetermined interval inside the outer diaphragm 12 to a predetermined height lower than the outer diaphragm 12. Formed.

The exhaust duct 60 is disposed outside the outer diaphragm 12 so as to surround the entire combustion chamber 10.

In this case, an exhaust port 61 is provided on the upper exhaust duct 60 of the combustion chamber 10, so that the exhaust gas generated in the combustion chamber 10 is an empty space between the inner diaphragm 11 and the outer diaphragm 12. After exiting in the downward direction of the combustion chamber 10 through the exhaust duct 60 outside the outer diaphragm 12 is to rise through the exhaust port 61.

In addition, a heat exchanger H is integrally formed in the combustion chamber 10 having the above-described configuration, and the heat exchanger H includes a combustion chamber wall including an inner diaphragm 11 and an outer diaphragm 12. The stainless corrugated pipes 41 and 51, which do not require heat exchange fins, are wound in one line while going up from the lower part of the combustion chamber 10 along the W).

At this time, the stainless corrugated pipe (41, 51) is formed as a heating water inlet 80 through which the heating water can be introduced from the lower end of the combustion chamber 10, as shown in Figure 3 and 4, the heating water inlet ( Starting from 80, the entire side surface of the combustion chamber 10 is wound in a state in which the entire side wall of the combustion chamber 10 is wound tightly from the lower side to the upper side, and the opposite end of the heating water inlet 80 is the lower end of one side of the combustion chamber 10. Is formed to be a heating water outlet 81 which can be extended to discharge the heating water passing through the inside of the combustion chamber (10).

Thus, in the present invention, the heat exchanger (H) is made of stainless corrugated pipes (41, 51) formed in a single line, and thus the sensible heat exchanger 40 and the latent heat exchanger (50) are integrally formed It is structured.

At this time, the distinction between the latent heat exchanger 50 and the sensible heat exchanger 40 formed integrally by the stainless corrugated pipes 41 and 51 formed as one line is the burner 30 provided below the combustion chamber 10. In the present invention, it is determined whether the direct heat of combustion is received, and the division of the latent heat exchanger 50 and the sensible heat exchanger 40 is determined by the height of the inner diaphragm 11.

That is, the latent heat exchanger 50 is blocked from being directly exposed to the combustion heat of the burner 30 by the internal diaphragm 11.

At this time, the inner diaphragm 11 which blocks the combustion chamber 10 and the latent heat exchanger 50 has a heat insulating material 90 for more reliably blocking the heat of combustion.

As described above, in the latent heat exchanger 50 in which direct contact with the heat of combustion of the burner 30 is blocked by the inner diaphragm 11 and the heat insulating material 90, exhaust gas generated during the combustion process exits the combustion chamber 10. Condensation occurs on the surface of the latent heat exchanger 50 by receiving latent heat of the exhaust gas while contacting in the process.

In addition, a separate heat insulator 91 is also attached to the outer side of the outer diaphragm 12 where the stainless corrugated pipes 41 and 51 are disposed, so that the heat loss in the combustion chamber 10 can be reduced as much as possible. This is to improve the thermal efficiency.

Hereinafter, look at the operation and effects of the present invention configured as described above.

Looking at the state of use of the condensing gas boiler according to the present invention, when the gas boiler is operated by operating a switch not shown, gas is introduced through the gas valve 31 and mixed with air in the burner 30. Ignition is generated to generate combustion heat in the combustion chamber 10.

At the same time, the fluid (heating water) that circulates the heat exchanger is introduced through the heating water inlet 80 through the operation of a circulation pump (not shown), and the fluid flowing into the heating water inlet 80 is the combustion chamber 10. ), It enters the cold state because of the heat transition.

The cold fluid thus introduced is heated (preheated) by causing heat exchange with the exhaust gas exiting the combustion chamber 10 while passing through the latent heat exchanger 50 located under the combustion chamber.

That is, when combustion occurs in the combustion chamber 10 as described above, the heat of combustion is applied to the sensible heat exchanger 40 configured above the inner diaphragm 11 of the combustion chamber 10 and exhaust gas is generated. In this case, the generated exhaust gas is discharged through the empty space between the inner membrane 11 and the outer membrane 12 separating the sensible heat exchanger 40 and the latent heat exchanger 50. As the exhaust gas passes through the latent heat exchanger 50, heat is generated between the fluids flowing along the inside of the latent heat exchanger 50 so that the latent heat exchanger 50 absorbs the latent heat of the exhaust gas and heats it (preheats). This will be done.

At this time, the cold temperature of the fluid passing through the inside of the latent heat exchanger 50 and the hot temperature of the exhaust gas meet and condensed water on the surface of the stainless corrugated pipe 51 constituting the latent heat exchanger 50 by the temperature difference. Will be created.

Then, the heating water heated while passing through the latent heat exchanger 50 flows along the inside of the stainless corrugated pipe 41 constituting the sensible heat exchanger 40 and is heated by direct combustion heat of the combustion chamber 10 to be heated. The heating speed of the water will be faster.

In addition, the warmed water is discharged through the heating water outlet 81 to heat the room while passing through an unillustrated heating pipe installed in each home or office.

Then, the heating water which has been heated in the heating pipe is returned to the latent heat portion heat exchanger 50 through the heating return pipe (not shown) again.

On the other hand, the condensed water generated in the process of heat exchange is received by the latent heat of the exhaust heat from the latent heat exchanger 50 is lowered to be discharged to the outside through the condensate outlet 70, the latent heat exchanger After the exhaust gas heat exchanged with the 50 exits the combustion chamber 10 in the same direction as the condensed water, the exhaust gas is lifted up through the exhaust duct 60 installed outside the combustion chamber 10 and exits through the exhaust port 61. .

Therefore, according to the present invention as described above, in forming the heat exchanger integrally in the combustion chamber, by configuring the sensible heat exchanger and the latent heat exchanger in a single line through a stainless corrugated pipe that is resistant to corrosion and does not require heat exchange fins, There is an advantage that the heat exchanger fabrication is easy.

In addition, a burner and a blower are disposed under the combustion chamber to adopt an upward combustion method, and a latent heat exchanger is disposed below the sensible heat exchanger, thereby directly absorbing the heat of combustion (sensible heat) from the combustion chamber and the latent heat absorption of the exhaust gas leaving the combustion chamber. By maximizing the effect of being able to realize a high efficiency heat exchange.

In addition, by using a stainless steel corrugated pipe that does not require heat exchanger fins, the heat exchanger area is increased by forming a sensible heat unit and a latent heat unit heat exchanger, thereby improving heat exchange efficiency. In order to eliminate the need for brazing welding, product productivity is greatly improved.

Claims (3)

A burner which mixes and combusts the gas introduced through the gas valve with air so as to provide combustion heat in the combustion chamber; A blower for supplying a predetermined amount of air to the burner; A sensible heat exchanger that directly heats the heating water by the combustion heat of the burner in the combustion chamber; In the condensing gas boiler comprising a latent heat exchanger for heating the heating water by the latent heat of the exhaust gas through heat exchange with the exhaust gas generated in the combustion chamber, The combustion chamber is provided with a combustion chamber wall consisting of an inner diaphragm and an outer diaphragm, The sensible heat exchanger and the latent heat exchanger are integrally formed by a stainless corrugated pipe wound up one line along the combustion chamber wall, and a latent heat exchanger is disposed below the sensible heat exchanger. The burner and the blower are sequentially installed in the lower portion of the sensible heat exchanger and the latent heat exchanger, which are lower parts of the combustion chamber, to allow upward combustion. An upstream combustion condensing gas boiler, characterized in that an exhaust duct having an exhaust port for exhausting the exhaust gas to the outside of the outer diaphragm of the combustion chamber is installed and a condensate outlet for discharging condensed water toward the lower portion of the combustion chamber. The method of claim 1, The outer diaphragm is formed to cover the entire combustion chamber, and the inner diaphragm is formed at a predetermined height lower than the outer diaphragm at a predetermined interval inside the outer diaphragm, and the inner diaphragm and the outer diaphragm are respectively attached to a heat insulating material. An upward combustion condensing gas boiler. The method of claim 1, The boundary division of the sensible and latent heat exchanger, which is composed of one line by the stainless corrugated pipe, is determined by the installation height of the inner diaphragm which blocks the heat of combustion according to whether it is directly contacted with the heat of combustion of the burner in the combustion chamber. Upstream combustion condensing gas boiler, characterized in that determined.