KR20170041533A

KR20170041533A - High efficiency heat exchanger of pellet boiler for prohibiting generation of condensing water

Info

Publication number: KR20170041533A
Application number: KR1020150141089A
Authority: KR
Inventors: 최성환; 박기식; 오준석
Original assignee: (주)귀뚜라미
Priority date: 2015-10-07
Filing date: 2015-10-07
Publication date: 2017-04-17

Abstract

The present invention relates to a heat exchanger for a high-efficiency pellet boiler, which prevents the excessive decrease of the combustion gas temperature by the pass pipe inserted between the firebox and the heat exchange connection, thereby preventing the generation of condensed water and the generation of condensed water for increasing the heat efficiency.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a high efficiency heat exchanger for a pellet boiler for preventing generation of condensed water,

The present invention relates to a heat exchanger for a high-efficiency pellet boiler which prevents generation of condensed water by preventing an excessive decrease in the temperature of the combustion gas at the heat transfer surface portion of the main heat exchanger by the pass pipe inserted between the firebox and the heat exchange connection, Lt; / RTI >

Pellet boilers typically use wood-like pellets as fuel, which has the disadvantage of relatively low thermal efficiency compared to fossil fuels, but has the advantage of being simple in structure, low in fuel cost, and environmentally friendly.

Korean Patent Laid-Open Publication No. 2014-0045649 " Wood Pellet Boiler Improving Heat Exchange Efficiency ", Korea Patent Publication No. 2012-0088912 " Pellet Boiler Improving Hot Water Heat Exchange Efficiency ", and Korean Patent Publication No. 2011-0038433 ' Fuel boilers' have been proposed.

Meanwhile, in the conventional pellet boiler as described above, heat is exchanged in a connection to discharge the flame and combustion gas generated in the burner and the combustion gas, as shown in Figs. 1A to 1C below, and hot water or heating water is supplied .

That is, as shown in FIG. 1A, the high-temperature combustion gas generated in the burner B rises along the fire room 11 to perform the primary heat exchange, then descends along the associated portions 12 and 13, And tertiary heat exchange.

Alternatively, as shown in FIG. 1B, the high temperature combustion gas generated in the burner B rises along the fire room 21 to perform the primary heat exchange, and then the secondary heat exchange is performed while descending simultaneously along the associated portion 22.

Alternatively, as shown in FIG. 1C, the high-temperature combustion gas generated in the burner B rises along the fire room 31 to perform the primary heat exchange, and then continues to rise along the associated section 32 in the upper part of the firebox, do.

However, since the temperature of the pellet boiler of the type shown in FIG. 1A is excessively lowered in the course of performing the first and second heat exchange in the combustion chamber 11 and the downfalling relationship 12, And condensation water is generated at the inner wall of the pipe during heat exchange.

That is, although the amount of condensed water generated decreases as the temperature difference between the low temperature water and the combustion gas increases, the pellet boiler of the type shown in FIG. 1A can not increase the temperature difference between the low temperature water and the combustion gas.

Therefore, ash generated in the combustion of the pellet fuel adheres to the condensed water generated in the inner wall of the uprising 13, thereby obstructing the associated passage. Therefore, there is a problem that the ash treatment is very difficult and heat exchange is not performed Occurs.

1B, since the temperature of the pellet boiler is excessively lowered in the course of performing the first and second heat exchanges in the combustion chamber 21 and the associated portion 22, condensate is generated in the subsequent section.

In addition, FIG. 1B is a view showing a state in which a dust collecting device 23 is required to be provided since the ash can not be separated while the flow path of the combustion gas is changed from the lower side to the upper side in the lower chamber 14 of the heat exchanger body as shown in FIG. .

On the other hand, the pellet boiler as shown in FIG. 1C can perform the first and second heat exchange while the combustion gas rises along the fire room 31 and the connection part 32 to reduce the generation of condensed water. However, (Height) of the heat exchanger is increased when the heat exchanger 32 is elongated.

In addition, in the case of FIG. 1C, since the combustion gas can not be naturally separated from the upper side to the lower side or from the lower side to the upper side, a separate dust collecting device (not shown) .

Korean Patent Publication No. 2014-0045649 Korea Patent Publication No. 2012-0088912 Korea Patent Publication No. 2011-0038433

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems and it is an object of the present invention to provide a heat exchanger for a high-efficiency pellet boiler, which prevents an excessive decrease in the temperature of the combustion gas at the heat transfer surface portion of the main heat exchanging portion to prevent the generation of condensed water, .

Another object of the present invention is to provide a heat exchanger for a high-efficiency pellet boiler, which is provided with a dust collecting device separately or prevents the generation of condensed water which prevents an increase in facility size or an excessive increase in manufacturing cost in order to increase the heat transfer area.

To this end, a heat exchanger for a high-efficiency pellet boiler for preventing the generation of condensed water according to the present invention comprises a heat exchanger body having a water chamber therein and a burner module for burning pellet fuel at one side; An upper chamber provided at an upper portion of the heat exchanger body; A lower chamber provided at a lower portion of the heat exchanger body; A firebox for guiding the combustion gas generated in the burner module to the upper chamber and guiding the combustion gas upward to the upper chamber; A pass pipe connected to the upper chamber and the lower chamber and installed to be downwardly inclined so as to guide the combustion gas downward; And a plurality of heat exchange links each of which is connected to the lower chamber and the exhaust port to perform tertiary heat exchange so as to be exposed to the water chamber, wherein the combustion gas rises along the fire chamber to perform primary heat exchange, And the second heat exchanging unit performs the second heat exchanging while changing the direction to the lower side by the pass pipe, ascends along the heat exchanging association, and is discharged after the third heat exchanging.

At this time, it is preferable that there is no heat exchange pin in the path tube and a heat exchange fin is provided in the heat exchange association.

In addition, it is preferable that the lower chamber has a lower opening connected to the burner module and the upper opening has a cylinder connected to the upper chamber.

Further, it is preferable that the plurality of heat exchange associations are arranged in a lattice form.

The present invention as described above suppresses an excessive decrease in the temperature of the combustion gas on the heat transfer surface of the main heat exchanging portion by using the path tube provided between the artificial room and the heat exchange connection. Thus, the facility size is prevented from increasing, and the generation of condensed water is prevented to increase the thermal efficiency.

In addition, the present invention connects the down tube to the lower chamber in a downward sloping manner. Accordingly, since the ashes are separated while the flow direction of the combustion gas is changed in the lower chamber, the ashes are separated and collected without a separate dust collecting device.

1A to 1C are front sectional views showing a conventional pellet boiler.
2 is a front sectional view showing a heat exchanger for a high-efficiency pellet boiler for preventing the generation of condensed water according to the present invention.
3 is a cross-sectional view illustrating a heat exchanger for a high-efficiency pellet boiler to prevent the generation of condensed water according to the present invention.

Hereinafter, a heat exchanger for a high-efficiency pellet boiler for preventing the generation of condensed water according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

2, the high efficiency pellet boiler heat exchanger for preventing the generation of condensed water according to the present invention includes a heat exchanger body 110, an upper chamber 120, a lower chamber 130, a firebox 140, (150) and a heat exchange association (160).

When the pellet fuel such as wood is supplied to the burner module B and burned, the low temperature water passing through the water chamber WT is burned at the time of burning Heat exchange with the generated heat source.

The upper chamber 120 and the lower chamber 130 are respectively installed at the upper and lower portions of the water chamber WT provided in the heat exchanger body 110. The combustion gas generated in the burner module B is supplied to the heat exchanger body 110, Thereby guiding the flow direction to change.

The firebox 140, the pass pipe 150, and the heat exchange association 160 provide a passage through which the combustion gas flows, thereby allowing heat exchange between the combustion gas and the low temperature water of the water column WT, , And the secondary and tertiary heat exchanges are sequentially performed.

Particularly, the present invention suppresses an excessive decrease in the temperature of the combustion gas by using the pass pipe 150 provided between the firebox 140 and the heat exchange association 160. Therefore, it is possible to prevent the condensed water from being generated and increase the thermal efficiency while preventing the facility size from becoming large.

In addition, the downward sloping pass pipe 150 is connected to the lower chamber 130 according to the present invention. Accordingly, since the ash is separated while the flow direction of the combustion gas is changed in the lower chamber 130, the ash generated when the pellet fuel is burned is separated and collected without using a separate dust collecting device.

To this end, the heat exchanger body 110 is provided with a water tank (WT) therein. The water chamber WT is formed by using the space inside the heat exchanger body 110 and the fire chamber 140, the path tube 150 and the heat exchange association 160 to be described later are exposed to the water chamber WT, respectively.

The heat exchanger body 110 is usually provided with an inlet IN and an outlet OUT and an inlet IN and an outlet OUT connected to the water chamber WT. Therefore, low temperature water such as direct water or heating water is supplied to the water chamber WT through the inlet IN and then discharged through the outlet OUT.

In addition, a burner module B is installed in the heat exchanger body 110. For example, the burner module B is assembled to the lower end of the heat exchanger body 110. [ The burner module (B) typically receives and burns pellet fuel such as wood.

The burner module B for blowing a heat source (flame and combustion gas) at the time of combustion supplies the heat source to the interior of the interior of the interior of the interior of the interior of the interior of the interior of the interior of the interior of the interior of the interior of the interior of the interior of the interior of the interior of the interior of the interior of the interior of the interior of the interior of the interior of the interior of the interior of the interior of the interior 140, do.

The upper chamber 120 and the lower chamber 130 are installed to be exposed to the water chamber WT inside the heat exchanger body 110. The upper chamber 120 is disposed above the heat exchanger body 110, (130) is disposed below the heat exchanger body (110).

The upper chamber 120 is connected to the upper end of the pass pipe 150 through which the combustion gas flows and the lower chamber 130 is connected to the heat pipe 150 through which the combustion gas flows, To the lower end of the frame.

The upper chamber 120 and the lower chamber 130 are each formed with a chamber in which a flow space is formed so that the upward combustion gas is lowered again in the upper chamber 120 and the lowered combustion gas is returned again in the lower chamber 130 An ascending air flow change occurs.

Particularly, in the lower chamber 130, the ash contained in the combustion gas is naturally separated and collected by the gravity while the combustion gas is descending, so that the present invention can collect and remove the ash do.

However, it is also possible to further include the ash receptacle which can be drawn in or out through the side (or front) of the lower chamber 130 so as to clean the collected material, or a cleaning door can be installed in the lower chamber 130 .

The combustion chamber 140 is installed to be exposed to the water chamber WT provided in the heat exchanger body 110 and performs primary heat exchange between the combustion gas and the low temperature water. At this time, the combustion gas generated in the burner module B is supplied to the upper side And guided to the upper chamber 120.

For this purpose, the artificial chamber 140 has a columnar shape having a predetermined height as an embodiment, and a shape such as a circular cylinder or a square column is used depending on the shape of the heat exchanger body 110. In addition, high heat conductivity material is used to increase the heat exchange rate.

The burner module B is connected to the lower end opening (that is, the heat source inflow side) of the firebox 140 and the upper end opening is connected to the upper chamber 120 so that the high- 140.

The pass pipe 150 corresponds to a core structure of the present invention and is installed between the fire room 140 and the heat exchange association 160 so that the combustion gas discharged from the fire room 140 is supplied to the heat exchange association 160, Guides the flow of gas.

The pass pipe 150 is installed so as to be exposed to the water chamber WT so as to perform secondary heat exchange and is connected between the upper chamber 120 and the lower chamber 130. The pass pipe 150 is installed to be downwardly inclined do.

That is, the upper opening of the pass pipe 150 is connected to the upper chamber 120 and the lower opening is connected to the lower chamber 130 so that the combustion gas rising along the fire chamber 140 is lowered again, .

As shown in FIG. 3, in the preferred embodiment, one pipe having a square cross-section is used in the pass pipe 150, unlike the heat exchange pipe 160 to be described later, without a heat exchange pin (or baffle plate). However, a pipe made of a metal having high thermal conductivity is used for heat exchange.

The pass pipe 150 is used as an aid to the heat exchange association 160 and is used to prevent the combustion gas from falling below the dew point temperature by lowering the heat exchange rate relative to the heat exchange association 160 do.

That is, it is possible to prevent the thermal efficiency from being lowered through heat exchange in the path tube 150, and to increase the temperature of the low temperature water filled in the water WT of the heat exchanger body 110 to some extent, Prevents excessive temperature drop of gas.

Accordingly, the present invention prevents the generation of condensed water in the heat exchange association 160 and prevents the ash of the pellet fuel from adhering to the inside of the heat exchange association 160 due to the generation of condensed water, thereby lowering the heat exchange rate.

Further, the present invention facilitates switching of the combustion gas from the lower chamber 130 to the heat exchange association 160 by providing the path tube 150 downwardly inclined with respect to the flow path of the combustion gas. Therefore, the combustion gas and the ashes are well separated.

However, the diameter, inclination angle, and cross-sectional shape of the above-described pass pipe 150 may be adjusted so that the combustion gas passing through the pass pipe 150 is maintained at 500 ° C or more and 700 ° C or less when the combustion gas flows into the heat exchange association 160 desirable.

If the temperature is less than 500 ° C, condensation water is liable to be generated in the heat exchange association 160. On the other hand, if the temperature is higher than 700 ° C, sufficient heat recovery is not performed even if the heat exchange association 160 performs tertiary heat exchange.

2 shows that the temperature of the combustion gas flowing into the heat exchange association 160 after passing through the lower chamber 130 is maintained at 1000 ° C in the artificial chamber 140 and 800 ° C in the path tube 150, And accordingly, even if the tertiary heat exchange with the low temperature water is performed, condensation water is not generated in the heat exchange association 160. [

The heat exchange association 160 is installed to be exposed to the water chamber WT of the heat exchanger body 110 to perform tertiary heat exchange and a plurality of heat exchange associations 160 are connected between the lower chamber 130 and the exhaust port The combustion gas rises independently of each other.

As a result, the combustion gas rises along the fire room 140 to perform primary heat exchange, and secondary path heat exchange is performed while the path pipe 150 is turned downward. Finally, the combustion gas rises along the heat exchange linkage 160, And is exhausted after performing car heat exchange.

As shown in FIG. 3, a plurality of heat exchange associations 160 are provided with a heat exchange fin 161 (or a baffle plate having a similar function) inside the heat exchanger body 160, WT) in a grid pattern to maximize the heat transfer area.

Accordingly, the present invention can prevent the generation of condensed water by increasing the temperature difference between the low-temperature water and the combustion gas by the path tube 150, while the portion of the path tube 150 alone, which does not provide a sufficient heat exchange effect, And is compensated by association 160.

The combustion gas having risen along the heat exchange association 160 and having undergone the third heat exchange as described above flows to the exhaust port 171 through the exhaust chamber 170 and the combustion gas is exhausted through the exhaust port 171, .

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

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

110: heat exchanger body
120: upper chamber
130: lower chamber
140: Japanese style room
150: Pass pipe
160: Heat exchange association
170: discharge chamber
171: Exhaust
B: Burner module
WT: Washroom
ASH: Ash

Claims

A heat exchanger body 110 having a water chamber WT therein and provided with a burner module B for burning pellet fuel;
An upper chamber 120 provided on the upper portion of the heat exchanger body 110;
A lower chamber 130 provided below the heat exchanger body 110;
A firebox 140 installed to be exposed to the water chamber WT to perform primary heat exchange and guide the combustion gas generated in the burner module B upward to the upper chamber 120;
A pass pipe 150 connected to the upper chamber 120 and the lower chamber 130 so as to be exposed to the water chamber WT and subjected to secondary heat exchange and installed to be downwardly inclined to guide the combustion gas downward, ; And
And a plurality of heat exchange joints (160) installed to be exposed to the water chamber (WT) to perform tertiary heat exchange and connected between the lower chamber (130) and the exhaust port,
The combustion gas rises along the fire room 140 and performs primary heat exchange and performs secondary heat exchange while changing the direction to the lower side by the path pipe 150. The heat of the combustion gas rises along the heat exchange association 160, Wherein the heat exchanger is disposed downstream of the heat exchanger.

The method according to claim 1,
A heat exchanger according to any preceding claim, wherein the heat exchanger (150) has no heat exchange fin and the heat exchange association (160) has a heat exchange fin.

3. The method of claim 2,
Wherein the firebox (140) has a lower opening connected to the burner module (B) and an upper opening formed by a cylinder connected to the upper chamber (120).

The method of claim 3,
Wherein the plurality of heat exchange associations (160) are arranged in a lattice shape.