KR102366314B1 - Pellet Stove For Reduction Time Of First Ignition and preheating method for the same - Google Patents

Abstract

The present invention relates to a pellet fireplace for shortening an initial ignition time and a preheating method thereof. The pellet fireplace of the present invention comprises: a housing unit; a pellet providing unit mounted inside the housing unit; a pellet heating unit mounted adjacent to a tubular transfer path; a combustion furnace mounted inside the housing unit; a combustion air supply unit; a combustion gas exhaust for providing a flow path; a hot air providing pipe; a heat transfer unit for preheating outside air; a combustion air amount control unit; an exhaust amount control unit; and a control unit.

Description

A pellet fireplace capable of shortening the initial ignition time and its preheating method {Pellet Stove For Reduction Time Of First Ignition and preheating method for the same}

The present invention relates to a pellet fireplace and a method for preheating the same, and more particularly, to a pellet fireplace and a method for preheating the same, which can significantly shorten the time required for initial ignition.

Recently, due to the sharp rise in the price of energy sources such as crude oil, wood-pellets, which are processed by crushing forestry waste or logging wood, into sawdust, and then compressing them into a cylindrical shape with a length of 3.8 cm and a thickness of 0.6 to 0.8 cm have been produced. It is attracting attention as an alternative energy fuel. Such wood pellets can produce high thermal efficiency with a relatively small amount compared to kerosene or diesel, and because they are completely burned at high temperatures, there is a characteristic that almost no incineration ash remains even after incineration, and no harmful gas is generated due to combustion, which protects the environment. do not contaminate

In particular, the above-mentioned wood pellets are a fuel excluded from carbon dioxide regulation in the IPCC (Intergovernmental Panel on Climate Change) because the carbon emission, the main culprit of global warming, is also weak at 1/12 of that of general diesel, and it is a fuel in a uniform form. It is possible to supply energy, so it is possible to precisely control the amount of energy, and the density and storage capacity of energy are large.

These wood pellets are widely known as an advanced eco-friendly energy source that helps to reduce energy costs, and research for using wood pellets in various fields is being actively conducted.

Thanks to the demand for pellet stoves for using these wood pellets, various types of pellet stoves are currently being developed and sold.

The conventional pellet stove has a configuration in which the pellets are supplied by dropping the pellets into a combustion bowl (ash-receiving bowl) installed on the floor or the floor inside the combustion chamber, and the supplied pellets are burned by high temperature and blowing air. And the combustion heat is configured to move with the rising air flow through the heat radiation duct communicating with the upper part of the combustion chamber (combustion furnace) to be discharged to the outside of the pellet stove, that is, to the interior.

However, in the case of such a conventional pellet stove, there is a problem in that the fine dust generated from the combustion heat of the pellets is partially included in the updraft and discharged to the outside.

To solve this problem, a pellet stove having a structure as shown in FIG. 1 was developed.

However, in the case of a conventional pellet stove, such as the pellet stove shown in FIG. 1, after accommodating the pellets in the combustion furnace, there is a problem that it takes a long time for the initial ignition to be ignited by an igniter. In addition, in the case of a pellet stove according to the prior art, it takes a long time for initial ignition, and incomplete combustion may occur during initial ignition. At this time, combustion gas containing a large amount of fine dust and nitrogen oxides (NOx) is generated due to the generated incomplete combustion, and the combustion gas thus generated is discharged to the outside without any filtration process.

In order to solve this problem, a separate filtration filter is mounted on the exhaust pipe of the pellet stove, but this solution is a means to solve only some problems, and is not a fundamental solution that can solve incomplete combustion.

Accordingly, there is a need for a technique capable of solving the above-mentioned problems according to the prior art.

Korean Patent Publication No. 10-2018-0107523 (published on October 02, 2018)

An object of the present invention is to provide a pellet fireplace capable of significantly reducing the time required for initial ignition, maintaining the cleanliness of the combustion furnace monitoring window, and effectively removing foreign substances contained in exhaust gas, and a method for preheating the same will do

According to one aspect of the present invention as a means of solving the problem,

A pellet storage space is provided inside and a combustion furnace monitoring window that can monitor the combustion furnace mounted therein from the outside is mounted on one side of the housing part, and the pellets mounted inside the housing part and accommodated in the pellet storage space are tubular. A pellet supply unit provided to the combustion furnace using a mold transfer path, a pellet heating unit mounted adjacent to the tubular transfer path and heating the pellets transported through the tubular transfer path, and mounted inside the housing unit, A combustion space of a predetermined volume capable of accommodating the pellets received from the pellet providing unit is formed, a combustion air inlet hole is formed on one side or the lower side, and a combustion furnace equipped with an ignition device on one side, and one side or inside of the housing unit Combustion provided with a combustion air supply unit mounted to suck air from the outside to provide air to the combustion air inlet hole of the combustion furnace, and a structure communicating with the upper space of the combustion furnace and providing a flow path for discharging combustion gas to the outside A gas exhaust unit, a hot air supply pipe for providing heated air to a user by performing heat exchange with the combustion gas exhausted through the combustion gas exhaust unit, and a heat transfer unit for preheating the external air sucked into the combustion air supply unit; A combustion air amount control unit for controlling the amount of combustion air provided to the combustion furnace from the combustion air providing unit, an exhaust amount control unit for adjusting the exhaust amount exhausted by the combustion gas exhaust unit, and provided from the combustion air providing unit when ignited and a control unit for controlling the heat transfer unit, the combustion air amount control unit, and the exhaust amount control unit to preheat the combustion air and to increase the combustion air amount and reduce the exhaust amount after ignition is completed.

It may further include a preheating heat exchanger in which combustion air sucked in through the combustion air providing unit is preheated by heat exchange with combustion gas exhausted through the combustion gas exhaust path.

A first intake air temperature sensor installed on the combustion air providing unit to measure the combustion air temperature on the heat transfer unit side, and a second intake air temperature sensor for measuring the combustion air temperature preheated by the preheating heat exchange unit, wherein the The control unit may determine whether to operate the electric heater according to the combustion air temperature measured by the first intake air temperature sensor and the second intake air temperature sensor.

The combustion air amount control unit may include an intake fan installed on the combustion air providing unit to adjust the combustion air intake speed.

The combustion gas exhaust unit has a structure communicating with the upper space of the combustion furnace, and includes a combustion gas inlet passage providing a space through which the combustion gas burned in the combustion furnace can flow upward, and the exhaust amount adjusting unit includes combustion gas. It may include an exhaust passage control valve installed at the inlet end side of the inlet passage to control the size of the combustion gas inlet passage.

The exhaust flow path control valve has a structure that is installed and surrounds each of the four sides of the combustion gas inlet flow path, and when it rotates downward and gathers at a predetermined angle with respect to the vertical direction, it narrows the exhaust flow path, and rotates upward to expand it in the horizontal direction It includes four valve plates capable of widening the exhaust passage, and each valve plate may have a structure convexly curved toward the inside of the exhaust passage to guide combustion gas downward toward the combustion passage when rotating downward. .

The pellet providing unit is mounted adjacent to the lower surface of the pellet storage space and a pellet receiving port capable of accommodating the pellets stored in the pellet storage space by its own weight is formed on one side and a pellet outlet for providing pellets to the combustion furnace on the other side The formed tubular transfer path, and a structure extending at a predetermined angle from the tubular transfer path to the combustion furnace, and in the middle, a detour that detours sideways with respect to the straight transfer direction from the tubular transfer path to the combustion furnace can be formed.

The combustion gas exhaust unit has a structure communicating with the upper space of the combustion furnace and includes a first combustion gas exhaust passage that is installed adjacent to the warm air providing pipe to perform heat exchange with the warm air providing pipe, and the combustion gas exhaust path And the hot air providing pipe may be formed in a structure that performs a cylindrical and multi-tube heat exchange.

A photocatalyst and an anion catalyst capable of collecting fine dust and nitrogen oxides (NOx) contained in the combustion gas may be installed in the exhaust gas exhaust unit.

According to another aspect of the present invention as a means of solving the problem, in the method of preheating a pellet fireplace, when the temperature of the external air sucked into the combustion air providing unit is below a certain temperature, the heat transfer unit is operated and provided through the combustion air providing unit an ignition preparation step of preheating the combustion air to be used and controlling the amount of combustion air provided through the combustion air providing unit to a minimum amount by the combustion air amount adjusting unit; and an ignition step of adjusting the exhaust amount to a minimum amount by the exhaust amount adjusting unit.

In the ignition preparation step, the exhaust amount adjusting unit may be characterized in that it adjusts the exhaust amount to a maximum amount.

The ignition step may be terminated when a preset preheating time has elapsed and the combustion temperature of the combustion furnace side is equal to or greater than a predetermined temperature.

The ignition preparation step may be characterized in that by operating the pellet heating unit to provide a heated pellet.

According to another aspect of the present invention as a means of solving the problem, in the method of preheating a pellet fireplace, the ignition step is a first process of preheating combustion air by the heat transfer unit and the preheating heat exchange unit by operating the heat transfer unit; , a second process of stopping the heat transfer unit and preheating the combustion air by the preheating heat exchange unit when the temperature of the combustion gas exhausted to the preheating heat exchange unit reaches a predetermined temperature or higher.

According to an embodiment of the present invention, a housing unit having a specific structure, a combustion furnace monitoring window, a pellet supply unit, a pellet heating unit, a combustion furnace, a combustion air supply unit, a heat transfer unit, a combustion air amount control unit, an exhaust amount control unit, and a control unit are provided. By doing so, it is possible to significantly reduce the time required for initial ignition, to maintain the cleanliness of the combustion furnace monitoring window, and to provide a pellet fireplace capable of effectively removing foreign substances contained in exhaust gas by reducing incomplete combustion.

According to an embodiment of the present invention, by additionally configuring a preheating heat exchange unit to preheat combustion air together with the heat transfer unit, power consumption by the heat transfer unit can be reduced.

According to an embodiment of the present invention, when the exhaust amount is controlled to the minimum amount by the exhaust amount adjusting unit, incomplete combustion can be reduced by returning the incomplete gas or the low-temperature gas back to the combustion furnace by the valve plate.

According to an embodiment of the present invention, by mounting the pellet heating unit adjacent to the pellet providing unit, by preheating and drying the pellets provided in the combustion furnace, it is possible to significantly reduce the time required for initial ignition.

According to an embodiment of the present invention, by additionally configuring a bypass in the conveying path extension of the pellet providing unit, it is possible to reduce the conveying speed of the pellets to prevent the pellets from being separated from the combustion furnace.

According to an embodiment of the present invention, heat transfer efficiency can be improved by performing a cylindrical and multi-tube heat exchange between the hot air supply pipe and the first combustion gas exhaust path.

According to an embodiment of the present invention, by forming an air curtain between the combustion furnace and the combustion furnace monitoring window, it is possible to keep the combustion furnace monitoring window clean.

According to an embodiment of the present invention, by installing a photocatalyst and an anion catalyst in the combustion gas exhaust unit, fine dust, nitrogen oxides (NOx), and sulfur oxides (SOx) generated during pellet combustion can be effectively collected and treated, so that the pellets can be treated. It is possible to prevent air pollution caused by the use of fireplaces, and there is no need to replace photocatalysts and anion catalysts.

1 is a schematic view showing a pellet fireplace according to the prior art.
Figure 2 is a perspective view showing a pellet fireplace according to an embodiment of the present invention.
Figure 3 is a schematic front view showing a pellet fireplace according to an embodiment of the present invention.
4 is a front schematic view showing a pellet providing unit according to an embodiment of the present invention.
5 is a front schematic view showing a pellet providing unit according to another embodiment of the present invention.
6 is a side schematic view showing the pellet providing unit viewed in the direction of the arrow A shown in FIG.
7 is a front schematic view showing a pellet providing unit according to another embodiment of the present invention.
8 is a front schematic view showing a combustion furnace, a combustion furnace monitoring window, an air curtain injection hole, and an air curtain forming barrier according to an embodiment of the present invention.
9 is a schematic front view showing a first combustion gas exhaust passage, a second combustion gas exhaust passage, and a piping for providing hot air according to another embodiment of the present invention.
FIG. 10 is an enlarged view of part A of FIG. 9 .
11 is a schematic front view illustrating a first combustion gas exhaust path and a piping for providing hot air according to another embodiment of the present invention.
12 is a schematic front view showing a combustion gas exhaust unit equipped with a catalytic filter having a honeycomb structure according to an embodiment of the present invention.
13 is a front schematic view showing a combustion gas exhaust unit equipped with a cyclone vortex forming unit according to an embodiment of the present invention.
14 is a block diagram showing a process of preheating a pellet fireplace according to an embodiment of the present invention.

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

In describing the present invention, the terms used in the following specification are used only to describe specific embodiments, and are not intended to limit the present invention. The singular expression includes the plural expression unless the context clearly dictates otherwise.

In addition, in this specification, terms such as "comprise" or "have" are intended to designate that the features, numbers, steps, operations, components, parts, or combinations thereof described in the specification exist, and one or more other It should be understood that this does not preclude the possibility of addition or presence of features or numbers, steps, operations, components, parts, or combinations thereof.

Also, terms such as first, second, etc. may be used to describe various components, but the components should not be limited by the terms. The above terms are used only for the purpose of distinguishing one component from another.

In addition, terms such as “…unit”, “…unit”, “…module”, etc. described in the specification mean a unit that processes at least one function or operation, which may be implemented by hardware or software or a combination of hardware and software. can

In the description with reference to the accompanying drawings, the same reference numerals will be assigned to the same components for the same components, and repeated descriptions of the same components will be omitted. And, in the description of the present invention, if it is determined that a detailed description of a related known technology may unnecessarily obscure the gist of the present invention, the detailed description thereof will be omitted.

Figure 2 is a perspective view showing a pellet fireplace according to an embodiment of the present invention is shown, Figure 3 is a front view schematic diagram showing a pellet fireplace according to an embodiment of the present invention is shown.

In addition, in Figures 4 to 7 is shown a pellet providing unit according to the present invention.

Referring to these drawings, the pellet fireplace 100 according to this embodiment has a specific structure of the housing part 110, the pellet providing part 120, the pellet heating part 126, the combustion furnace 140, the combustion air By having a study 150, a combustion gas exhaust unit 190, a hot air supply pipe 170, a heat transfer unit 200, a combustion air quantity control unit 210, an exhaust quantity control unit 166 and a control unit (not shown), It is possible to significantly reduce the time required for initial ignition, maintain the cleanliness of the combustion furnace monitoring window, and provide a pellet fireplace capable of effectively removing foreign substances contained in exhaust gas.

Hereinafter, with reference to the drawings, each configuration constituting the pellet fireplace 100 according to the present embodiment will be described in detail.

The housing unit 110 according to this embodiment, as shown in FIGS. 2 and 3, has a structure in which a pellet storage space 111 is provided therein. At this time, a combustion furnace monitoring window 112 capable of externally monitoring the combustion furnace 140 mounted therein is mounted on one side of the housing 110 .

The pellet providing unit 120 is a configuration mounted inside the housing 110 , and may provide the pellets stored in the pellet storage space 111 to the combustion furnace 140 using the tubular transfer path 121 . . In some cases, as shown in the drawings, the tubular transfer path 121 may be equipped with a transfer path extension portion 121-1 having a structure extending in the combustion furnace 140 direction at one end thereof.

In addition, the pellet heating unit 126, as shown in FIGS. 2, 4 and 7, is a configuration that is mounted adjacent to the tubular transfer path 121, and is transferred through the tubular transfer path 121 The pellets can be heated. At this time, the pellet heating unit 126 is preferably mounted in a structure surrounding the tubular transfer path 121 continuously from one side of the tubular transfer path 121 to the other side.

Specifically, the pellet providing unit 120, as shown in FIG. 4, may be configured to include a tubular transfer path 121 and a transfer screw 124 of a specific structure.

The transfer screw 124 is configured to be rotatably mounted inside the tubular transfer path 121, and as shown in FIG. It is preferable to have a continuous screw structure for moving the positioned pellets to the other side of the tubular transfer path 121 .

As shown in FIG. 7 , the pellet providing unit 120 may replace the transfer conveyor 125 instead of the transfer screw 124 . The conveying conveyor 125 is a configuration that is mounted so as to be reciprocally driven in one direction inside the tubular conveying path 121, and by reciprocating the pellets located on one side of the tubular conveying path 121 to the tubular conveying path ( 121) may be a caterpillar structure that changes the position to the other side. When the conveying conveyor 125 is mounted, the pellet heating unit 126 is preferably installed in the S3 region of FIG. 5 (b) so that heat can be applied more effectively to the pellets.

As mentioned above, the tubular transfer path 121 is a configuration to be mounted adjacent to the lower surface of the pellet storage space 111, the pellet storage space 111 that can accommodate the pellets by its own weight ( 122) may have a structure formed on one side, and a pellet outlet 123 for providing pellets to the combustion furnace 140 on the other side (refer to (c) of FIG. 4). In this case, the pellet heating unit 126 is preferably installed in the S2 region of FIG. 4 (c) so as to more effectively apply heat to the pellets.

In some cases, the pellet receiving port 122 and the pellet outlet 123 on the other side of the tubular transfer path 121 as shown in Fig. 4 (b) may be formed to face opposite to each other. In this case, the pellet heating unit 126 is preferably installed in the S1 region of FIG. 4 (b) so as to more effectively apply heat to the pellets. The pellet heating unit 126 is preferably a carbon fiber heater using electricity or an electric heater using a nichrome wire, but other heating devices using electricity can be used.

The pellet providing unit 120 has a structure in which the conveying path extension 121-1 is inclined at a predetermined angle like a slide from the tubular conveying path 121 toward the combustion furnace 140 . As shown in FIGS. 4 and 7 , the conveying path extension 121-1 may be formed in a straight-line shape in which the pellets are conveyed in a straight line. Or, as shown in FIGS. 5 and 6, the conveying path extension 121-1 is detoured in the forward and backward direction with respect to the straight conveying direction from the tubular conveying path 121 to the combustion furnace 140 in the middle. A bypass (121a) may be formed. That is, the transfer path extension portion 121-1 may have a zigzag structure. In this case, as the pellet 10 is detoured to the bypass 121a rather than when it is transported straight as shown in FIGS. 4 and 7 , the transport speed is reduced, so that when the pellets 10 fall into the combustion furnace 140 , the combustion furnace (140) The bar does not bounce out, it may be more preferable.

The combustion furnace 140 is a configuration mounted inside the housing 110, and as shown in FIGS. 4 to 8 , a combustion space of a predetermined volume capable of accommodating the pellets received from the pellet providing unit 120 is provided. the structure formed. A combustion air inlet hole 141 is formed on one side or a lower portion of the combustion furnace 140 , and as shown in FIG. 8 , the ignition device 142 is preferably mounted on one side of the combustion furnace 140 .

In addition, the combustion furnace 140, as shown in FIGS. 3 and 8, has a structure including a first combustion air inlet hole 141-1 and a second combustion air inlet hole 141-2 having a specific structure. can

Specifically, the first combustion air inlet hole 141-1 is a configuration formed on one side adjacent to the lower surface of the combustion furnace 140, and is configured to introduce air provided from the combustion air providing unit 150 to the side. can In addition, the second combustion air inlet hole 141 - 2 is a configuration formed in a plurality of the lower surface of the combustion furnace 140 , and may introduce air provided from the combustion air providing unit 150 upward.

The combustion air providing unit 150 is a component mounted on one side or inside of the housing unit 110 , and may supply air to the combustion air inlet hole 141 of the combustion furnace 140 by sucking air from the outside. In addition, the combustion air providing unit 150 according to the present embodiment can maintain the cleanliness of the combustion furnace monitoring window 112 by forming an air curtain between the combustion furnace 140 and the combustion furnace monitoring window 112 . there is.

The combustion gas exhaust unit 190 is configured to include a first combustion gas exhaust passage 161 , a second combustion gas exhaust passage 162 , and a combustion gas inlet passage 165 .

Specifically, the first combustion gas exhaust passage 161 has a structure in communication with the combustion gas inlet passage 165 , and the combustion gas burned in the combustion furnace 140 flows downward in the upper space of the combustion furnace 140 . provide space for

The second combustion gas exhaust path 162 is a configuration mounted on the lower portion of the housing 110 , has a structure in communication with the first combustion gas exhaust path 161 , and is transmitted through the first combustion gas exhaust path 161 . A space for discharging the exhausted combustion gas to the outside is provided.

The combustion gas inlet passage 165 communicates with the upper space of the combustion furnace 140 and has a structure in communication with the upper side of the first combustion gas exhaust passage 161 . That is, the combustion gas inlet passage 165 is installed in the upper space of the combustion furnace 140 , and is connected to the upper end of the first combustion gas exhaust passage 161 . The combustion gas inlet passage 165 is a pipe structure installed vertically, the lower end of which is open, and a hole communicating with the first combustion gas exhaust passage 161 at a portion recognized with the first combustion gas exhaust passage 161 . This is formed to provide a space in which the combustion gas burned in the combustion furnace 140 can flow upward.

Meanwhile, the first combustion gas exhaust path 161 is installed adjacent to the warm air providing pipe 170 to perform heat exchange with the warm air providing pipe 170 . Accordingly, the hot air providing pipe 170 supplies heated air to the indoor space by performing heat exchange with the combustion gas flowing through the first combustion gas exhaust path 161 .

Preferably, the first combustion gas exhaust passage 161 is formed in a structure that surrounds the combustion furnace 140 and a portion of the upper space of the combustion furnace 140 , thereby maximizing heat exchange efficiency.

At this time, as shown in FIG. 10 , on one side or both sides of the first combustion gas exhaust path 161 , a heat sink structure capable of increasing the contact area with the air flowing through the hot air providing pipe 170 or An uneven structure 163 may be formed. The above-mentioned heat sink structure is generally a structure that performs a heat dissipation function mounted on electronic equipment, and since it is a well-known structure, it will be omitted herein.

More specifically, an air inlet 171 is mounted on a lower portion of the warm air providing pipe 170 according to the present embodiment, and an air outlet 172 is formed at an upper portion of the warm air providing pipe 170 . At this time, the hot air providing pipe 170 performs heat exchange with the first combustion gas exhaust path 161 while the air introduced from the air intake port 171 flows upward.

In some cases, as shown in FIG. 9, a portion of the outer surface of the tubular transfer path 121 is in direct contact with the combustion gas flowing through the first combustion gas exhaust path 161, before combustion of the pellets. The drying effect can be maximized.

Alternatively, as shown in FIG. 11 , the combustion gas exhaust path 161 and the hot air providing pipe 170 may have a structure for performing heat exchange in a cylindrical and multi-tube type. That is, a plurality of exhaust pipes 161-3 are installed inside the hot air providing pipe 170 in a multi-pipe structure, and are installed while maintaining a certain distance from each other, so that the air introduced from the air intake 171 through the gap between them flows upward. can be The exhaust pipes 161-3 have a vertically long structure, and guide the combustion gas downward. On the other hand, the first combustion gas exhaust passage 161 includes a first combustion gas upper exhaust passage 161-1 having a structure communicating with the exhaust gas inlet passage 165 and the upper portions of the plurality of exhaust pipes 161-3, and a plurality of It may be configured to include a first combustion gas lower exhaust passage 161-2 communicating with the lower portions of the exhaust pipes 161-3 to guide combustion gas to the second combustion gas exhaust passage 162 .

In addition, a plurality of baffles 174 are installed inside the hot air providing pipe 170 , and the air introduced from the air intake 171 flows in a zigzag manner while passing through the plurality of exhaust pipes 161-3. A plurality of baffles 174 are installed while maintaining a certain distance in the vertical direction, respectively, installed across a plurality of exhaust pipes 161-3, the left or right side is opened alternately along the vertical direction.

As shown in FIG. 3 , the heat transfer unit 200 is configured to be installed adjacent to the combustion air providing unit 150 , and may preheat the cold low temperature combustion air sucked into the combustion air providing unit 150 . At this time, the heat transfer unit 200 has a structure surrounding the combustion air providing unit 150, and generates heat by electric resistance. The heat transfer unit 200 may be configured to include a copper coil suitable for heat generation by electrical resistance.

Meanwhile, a preheating heat exchange unit 220 for preheating combustion air sucked in through the combustion air providing unit 150 together with the heat transfer unit 200 may be additionally configured. That is, the preheating heat exchanger 220 heats the combustion air sucked in through the combustion air providing unit 150 with heat exchange with the combustion gas exhausted through the combustion gas exhaust path 190 . The preheating heat exchanger 190 has a structure surrounding the combustion air supply unit 150 , and communicates with the second combustion gas exhaust path 162 of the combustion gas exhaust unit 190 .

The combustion air amount adjusting unit 210 is installed on the combustion air providing unit 150 and includes an intake fan 212 for adjusting the combustion air intake speed, and by adjusting the intake speed by the intake fan 212, the combustion air is produced. Controls the amount of combustion air provided to the combustion furnace 140 from the study (150). In addition, it is possible to help combustion by blowing wind into the combustion furnace 140 by the intake fan 212 like a fan. Alternatively, although not shown, the combustion air amount adjusting unit 210 may have a valve structure installed on the combustion air providing unit 150 to adjust the flow size of air passing through the combustion air providing unit 150 .

The exhaust amount control unit 166 is a valve structure that adjusts the size of the exhaust flow path, and adjusts the exhaust amount exhausted by the combustion gas exhaust unit 190 . That is, the exhaust amount control unit 166 may be installed at the inlet end side of the combustion gas inlet flow path 165 and may be composed of an exhaust flow path control valve 166 that adjusts the size of the combustion gas inlet flow path 165 . The exhaust flow path control valve 166 has a structure in which four valve plates 166b are respectively installed and surround the combustion gas inlet flow path 165 . Each valve plate 166b is coupled to the combustion gas inlet flow path 165 through a rotation shaft 166a rotated by a motor and rotates up and down.

Accordingly, as shown by the solid line in the enlarged portion of FIG. 3 , when the four valve plates 166b rotate downward and are gathered at a predetermined angle with respect to the vertical direction in a structure like a pipe, the exhaust flow path is narrowed. As shown by the dotted line in the enlarged portion of FIG. 3 , when the four valve plates 166b rotate upward and spread out in the horizontal direction, the exhaust passage can be widened.

Meanwhile, each valve plate 166b has a structure that is convexly curved toward the inside of the exhaust passage when it rotates downward, and in this case, the combustion gas may be guided downward toward the combustion furnace 140 .

The control unit controls the pellet fireplace like the preheating method of the pellet fireplace to be described later with reference to FIG. 14 .

Meanwhile, the control unit may control the pellet fireplace by receiving information from the first intake air temperature sensor 230 and the second intake air temperature sensor 232 . The first intake air temperature sensor 230 is installed on the combustion air supply unit 150 side to measure the combustion air temperature on the heat transfer unit 200 side. The first intake air temperature sensor 230 may be installed in front of the heat transfer unit 200 to measure the combustion air temperature before preheating by the heat transfer unit 200 . The second intake air temperature sensor 232 measures the temperature of the combustion air preheated by the preheating heat exchange unit 220 . The second intake air temperature sensor 232 may be installed behind the preheating heat exchanger 220 to measure the temperature of the combustion air preheated by the preheating heat exchanger 220 .

8 is a front schematic view showing a combustion furnace, a combustion furnace monitoring window, an air curtain injection hole, and an air curtain forming barrier according to an embodiment of the present invention.

Referring to these drawings, the pellet fireplace 100 according to the present embodiment, by mounting the air curtain forming bulkhead 180 of a specific structure at a specific position, the air curtain toward the inner surface of the combustion furnace monitoring window 122 can be formed.

Specifically, as shown in FIG. 6 , the air curtain forming barrier rib 180 is configured to be mounted between the combustion furnace 140 and the combustion furnace monitoring window 112 . At this time, the air curtain forming barrier rib 180 is installed in a structure surrounding the side surface of the combustion furnace 140 , and is installed at a height corresponding to the height of the combustion furnace 140 . In addition, a plurality of air curtain injection holes 181 for spraying the air provided from the combustion air providing unit 150 upwardly are formed at the lower portion of the air curtain forming partition wall 180, spaced apart from each other by a predetermined interval.

As shown in FIG. 8 , the air curtain generated from the air curtain injection port 181 can prevent combustion products such as flames, combustion gases, and foreign substances from being adsorbed to the inner surface of the monitoring window 112 .

9 is a front schematic view showing a first combustion gas exhaust path, a second combustion gas exhaust path, and a hot air supply pipe according to an embodiment of the present invention, and FIG. 10 is an enlarged view of part A of FIG. there is.

In addition, the pellet fireplace 100 according to this embodiment, as shown in FIGS. 9 and 10 , so that the air injected from the air curtain injection hole 181 can be exhausted along the upper space of the combustion furnace 140 . , a combustion gas flow guide 113 may be installed in the upper space of the combustion furnace 140 .

As shown in FIG. 10 , not only the combustion gas moving upward through the combustion furnace 140 , but also the air injected from the air curtain injection hole 181 is guided to be exhausted in a specific direction by the flow guide 113 .

12 is a schematic front view showing a combustion gas exhaust unit equipped with a catalytic filter of a honeycomb structure according to an embodiment of the present invention, and FIG. 13 is a combustion equipped with a cyclone vortex forming unit according to an embodiment of the present invention. A front schematic diagram showing the gas exhaust portion is shown.

Referring first to FIG. 12 , the pellet fireplace 100 according to this embodiment may be configured to also include a combustion gas exhaust unit 190 that provides a flow path for discharging combustion gas to the outside. The combustion gas exhaust unit 190 is configured to communicate with the upper space of the combustion furnace 140 .

At this time, as shown in FIG. 12 , in the combustion gas exhaust unit 190, a photocatalyst and an anion catalyst 191 capable of collecting fine dust, nitrogen oxides (NOx), and sulfur oxides (SOx) contained in the combustion gas. ), at least one of which may be installed. The photocatalyst and the anion catalyst do not require separate filter replacement, and have excellent properties in decomposing nitrogen oxides (NOx) and sulfur oxides (SOx).

Next, referring to FIG. 12 , the pellet fireplace 100 according to this embodiment may be mounted such that the cyclone vortex forming unit 130 is attached to the continuous gas exhaust unit 190 .

Specifically, the cyclone vortex forming unit 130 according to the present embodiment is a configuration for generating a vortex in the combustion gas to collect particulate foreign substances contained in the combustion gas, the combustion gas inlet 131 having a specific structure, It may have a configuration including a cylinder part 132 , a cone part 133 , and a combustion gas discharge pipe 134 .

The combustion gas inlet 131 communicates with the combustion gas exhaust unit 190 to deliver combustion gas into the cylinder, and is spaced apart from the vertical center of the cylinder unit 132 by a predetermined distance to the upper portion of the cylinder unit 132 . is mounted on In addition, the combustion gas inlet 131 is preferably arranged to flow downwardly while turning the combustion gas received through the combustion gas exhaust unit 190 along the inner surface of the cylinder.

The cylinder part 132 has a hollow cylinder structure, and may provide a flow path to flow the combustion gas introduced from the upper part to the lower part.

The conical part 133 mounted in a structure communicating with the lower part of the cylinder part 132 has a conical structure with a diameter decreasing downward, and it is preferable that a foreign material outlet 135 for discharging the dust collected on the lower surface is formed. .

In addition, the combustion gas discharge pipe 134 is a configuration that extends from the upper part of the cylinder part 132 downward along the inner center of the cylinder part 132 by a predetermined length and is mounted, and is located in the inner center of the cylinder part 132 . Combustion gas can be discharged to the outside.

The cyclone vortex forming unit 130 according to the present embodiment may cause a swirling motion in the combustion gas transferred from the combustion gas exhaust unit 190 to separate particulate foreign substances impregnated in the combustion gas by centrifugal force. That is, after a swirling motion is applied to the combustion gas introduced into the cylinder part 132 to form a descending swirl flow, the particulate foreign matter impregnated in the combustion gas obtains centrifugal force to get out of the swirl flow, and the cylinder part 132 and the circle It collides with the inner wall of the weight part 133 and falls through the foreign material outlet 135 formed at the lower end of the cone part 133 to collect dust. Since the diameter becomes narrower toward the lower end of the conical part 133, the swirl flow speed increases, so that the particulate foreign material acquires sufficient centrifugal force. This structure is a structure that improves the particulate foreign matter trapping effect. As the downward swirl flow passes through the lower end of the combustion gas discharge pipe 134 , the outer layer of the swirl flow rather than the diameter of the combustion gas discharge pipe 134 is separated from the inner layer of the swirl flow due to a pressure difference. At this time, the inner layer of the separated swirl flow joins the internal vortex rising along the combustion gas discharge pipe 134 and is discharged while swinging upward. At this time, the exhausted combustion gas is in a state in which particulate foreign matter has been removed.

As shown in FIG. 14, a detailed description of the preheating method of the pellet fireplace controlled by the control unit is as follows.

The preheating method of the pellet fireplace according to the present invention may consist of an ignition preparation step and an ignition stage.

In the ignition preparation step (S10), when the operation of the pellet fireplace is started, the control unit obtains information on the intake temperature of external air that is sucked into the combustion air providing unit 150 through the first intake air temperature sensor 320, that is, the combustion air.

At this time, if the external air sucked into the combustion air supply unit 150 is not relatively cold, there may be no difficulty in ignition. ℃ or less), the heat transfer unit 200 can be operated. When the heat transfer unit 200 is operated, the external air sucked into the combustion air providing unit 150 may be preheated.

In addition, the controller may control the combustion air amount adjusting unit 210 to control the amount of combustion air provided through the combustion air providing unit 150 to a minimum amount. That is, the intake fan 212 may rotate at a low speed. Therefore, it takes time for the heat transfer unit 200 to also generate heat above a certain temperature, and the combustion air provided through the combustion air providing unit 150 is sucked into the combustion furnace 140 before being sufficiently preheated, and the combustion furnace 140 . It can be prevented from making the atmosphere of the

Meanwhile, the controller may control the exhaust amount adjusting unit 166 to adjust the exhaust amount to a maximum amount.

Therefore, in the ignition preparation stage, before the combustion air is sufficiently preheated by the heat transfer unit 200, the minimum amount of combustion air is provided by the blowing force of the intake fan 232, and the exhaust amount is controlled to the maximum by controlling the combustion furnace 140 and combustion. Since the gas exhaust unit 190 can be ventilated, soot or foreign substances can be removed in advance, thereby making it easier to ignite in the ignition stage and reduce incomplete combustion. And at this time, since the combustion air provided by the combustion air providing unit 150 is cold and dry, moisture in the combustion furnace 140 and the combustion gas exhaust unit 190 may be removed by the above-described ventilation process, which is ignited. It may be desirable to shorten the time and minimize incomplete combustion.

On the other hand, the combustion furnace 140 may be provided with pellets by the pellet providing unit 120, the pellets provided at this time may be heated by the pellet heating unit (126).

The control unit controls the ignition preparation stage operation for about 1 to 2 minutes, or receives the combustion temperature information through a combustion temperature sensor installed on the combustion furnace 140 side, etc. to measure the combustion furnace 140 side temperature. Upon reaching a certain temperature, the ignition preparation stage can be terminated.

Next, the ignition step (S20) is a process of igniting the pellets provided to the combustion furnace 140 by the ignition device (142-2). At this time, when the combustion air provided by the combustion air providing unit 150 is preheated by the preheating heat exchange unit 220 together with the heat transfer unit 200, the first process (S22) and the second process (S24) as follows. can be done step by step.

In the first process (S22), the control unit continuously operates the heat transfer unit 200 following the ignition preparation stage to continue preheating the combustion air provided by the combustion air providing unit 150 . At this time, when ignition starts in the combustion furnace 140 and the combustion gas temperature rises, the combustion air provided by the combustion air providing unit 150 performs heat exchange with the combustion gas in the preheating heat exchange unit 220 to receive heat and also can be preheated.

At this time, the control unit adjusts the combustion air amount adjusting unit 210 to rotate the intake fan 212 at a high speed, and accordingly, the combustion air amount can be adjusted to the maximum amount. That is, cold outside air at low temperature has a high density, so the amount of air must be reduced for combustion. However, since the pellet fireplace according to the present invention preheats and provides warm outside air to favor ignition, the excess air is supplied by maximizing the amount of combustion air. It can reduce ignition time and reduce incomplete combustion. In addition, a fan-like effect is generated in the combustion furnace 140 by the blowing power of the suction fan 232 , so that ignition can proceed faster.

In addition, the control unit may adjust the exhaust amount adjusting unit 166 to set the exhaust amount to a minimum.

The control unit measures the temperature of the combustion air provided to the combustion furnace 140 through the second intake air temperature sensor 232, and when the temperature of the combustion gas passing through the preheating heat exchange unit 220 is above a certain temperature, the second process ( S22) is performed. In the second process (S22), the heat transfer unit 200 is stopped and the combustion air is preheated only by the preheating heat exchange unit 220 . Accordingly, power consumption by the heat transfer unit 200 can be reduced. At this time, as in the first process, the control unit controls the combustion air amount to the maximum amount and controls the exhaust amount to the minimum amount.

Therefore, in the ignition stage, warm excess air is supplied to the combustion furnace 140 as combustion air, and wind can be blown into the combustion furnace 140 by blowing force by the intake fan 232, and the temperature is minimized by minimizing the exhaust amount. By allowing the high combustion gas to stay in the firebox for a long time, the temperature of the combustion atmosphere on the combustion furnace 140 side can be maintained in a warm state favorably for ignition. In addition, since combustion is smooth, incomplete combustion can be prevented, and incomplete combustion is not exhausted directly through the combustion gas exhaust unit 190 by the exhaust amount control unit 166, but returns to the combustion furnace 140 side to be completely combusted. can

On the other hand, when the set preheating time (approximately 15 to 20 minutes) has elapsed and the combustion temperature of the combustion furnace is equal to or higher than a predetermined temperature, the control unit may end the ignition stage.

Thereafter, the controller controls the combustion air amount adjusting unit 210 and the exhaust amount adjusting unit 166 to continuously supply warm air at a temperature suitable for the user through the hot air providing pipe 170 .

As mentioned above, in the case of the pellet stove according to the prior art, after accommodating the pellets in the combustion furnace, there was a problem that it takes a long time for the initial ignition to be ignited by the igniter. In addition, in the case of a pellet stove according to the prior art, it takes a long time for initial ignition, and incomplete combustion may occur during initial ignition. At this time, combustion gas containing a large amount of fine dust, nitrogen oxides (NOx) and sulfur oxides (SOx) was generated due to the incomplete combustion, and the combustion gas thus generated was discharged to the outside without any filtration process. In order to solve this problem, a separate filtration filter is mounted on the exhaust pipe of the pellet stove, but this solution is a means to solve only some problems, and it was not a fundamental solution that can solve incomplete combustion.

On the other hand, according to an embodiment of the present invention, the housing unit 110 of a specific structure that performs a specific role, the combustion furnace monitoring window 112, the pellet providing unit 120, the pellet heating unit 126, the combustion furnace 140 ), combustion air supply unit 150, combustion gas exhaust unit 190, heat transfer unit 200, combustion air quantity control unit 210, exhaust quantity control unit 166, control unit, etc. can be significantly shortened, it is possible to maintain the cleanliness of the combustion furnace monitoring window 112, and it is possible to provide a pellet fireplace capable of effectively removing foreign substances contained in exhaust gas by reducing incomplete combustion.

In the above detailed description of the present invention, only specific embodiments thereof have been described. However, it is to be understood that the present invention is not limited to the particular form recited in the detailed description, but rather, it is to be understood to cover all modifications and equivalents and substitutions falling within the spirit and scope of the present invention as defined by the appended claims. should be

10: pellet
100: pellet fireplace
110: housing unit
111: pellet storage space
112: furnace monitoring window
113: flue gas flow guide
120: pellet providing unit
121: tubular transfer path
121-1: transfer path extension
122: pellet receiver
123: pellet outlet
124: transfer screw
125: transfer conveyor
126: pellet heating unit
130: cyclone vortex forming part
131: flue gas inlet
132: cylinder part
133: cone
134: flue gas discharge pipe
135: foreign matter outlet
140: combustion furnace
141: combustion air inlet hole
141-1: first combustion air inlet hole
141-2: second combustion air inlet hole
142: ignition device
150: combustion air supply unit
161: first flue gas exhaust path
162: second flue gas exhaust path
163: uneven structure
166: displacement control unit
170: piping for providing warm air
171: air intake
172: air outlet
180: air curtain forming bulkhead
181: air curtain nozzle
190: flue gas exhaust
191: catalyst filter
200: heat transfer unit
210: combustion air amount control unit
220: preheat heat exchange unit
230: first intake air temperature sensor
232: second intake air temperature sensor

Claims (14)

The pellet storage space 111 is provided therein, the combustion furnace monitoring window 112 that can monitor the combustion furnace 140 mounted therein from the outside is mounted on one side of the housing 110;
A pellet providing unit 120 mounted inside the housing unit 110 and providing the pellets stored in the pellet storage space 111 to the combustion furnace 140 using the tubular transfer path 121;
a pellet heating unit 126 mounted adjacent to the tubular transfer path 121 and heating the pellets transferred through the tubular transfer path 121;
It is mounted inside the housing unit 110, a combustion space of a predetermined volume capable of accommodating the pellets received from the pellet providing unit 120 is formed, and a combustion air inlet hole 141 is formed on one side or the lower side, , a combustion furnace 140 equipped with an ignition device 142 on one side;
a combustion air providing unit 150 mounted on one side or inside of the housing unit 110 and supplying air to the combustion air inlet hole 141 of the combustion furnace 140 by sucking air from the outside;
It has a structure communicating with the upper space of the combustion furnace 140 and provides a flow path for discharging combustion gas to the outside, and provides a space through which the combustion gas burned in the combustion furnace 140 can flow upward. a combustion gas exhaust unit 190 including a combustion gas inlet passage 165;
a hot air supply pipe 170 for providing heated air to a user by performing heat exchange with the combustion gas exhausted through the combustion gas exhaust unit 190;
a heat transfer unit 200 for preheating the external air sucked into the combustion air providing unit 150;
a combustion air amount adjusting unit 210 for adjusting the amount of combustion air provided to the combustion furnace 140 from the combustion air providing unit 150;
It is installed on the inlet end side of the combustion gas inlet passage 165 and is composed of an exhaust passage control valve 166 that adjusts the size of the combustion gas inlet passage 165 , so that the amount of exhaust exhausted by the combustion gas exhaust unit 190 . Displacement control unit 166 to control the; and
A control unit (not shown) that preheats the combustion air provided from the combustion air providing unit 150 during ignition, and controls the heat transfer unit, the combustion air amount control unit, and the exhaust amount control unit to increase the combustion air amount and reduce the exhaust amount after ignition is completed city);
A pellet fireplace comprising a. According to claim 1,
Pellet fireplace, characterized in that it further comprises a preheating heat exchange unit 220 for preheating the combustion air sucked through the combustion air providing unit 150 by exchanging heat with the combustion gas exhausted through the combustion gas exhaust unit 190. . 3. The method of claim 2,
a first intake air temperature sensor 230 installed on the combustion air providing unit 150 side to measure the combustion air temperature on the heat transfer unit side;
a second intake air temperature sensor (232) for measuring the temperature of the combustion air preheated by the preheating heat exchange unit (220);
The control unit is a pellet fireplace, characterized in that to determine whether the operation of the heat transfer unit 200 according to the combustion air temperature measured by the first intake air temperature sensor 230 and the second intake air temperature sensor 232 . According to claim 1,
The combustion air amount control unit 210 is installed on the combustion air providing unit 150, pellet fireplace, characterized in that it comprises an intake fan 212 for controlling the combustion air intake speed. delete According to claim 1,
The exhaust flow control valve 166 is
It has a structure that is installed and surrounds each of the four sides of the combustion gas inlet flow path, and when it rotates downward and gathers at a certain angle with respect to the vertical direction, it narrows the exhaust flow path, and when it rotates upward and spreads in the horizontal direction, the exhaust flow path can be widened. includes four valve plates 166b;
Each of the valve plates (166b) is a pellet fireplace, characterized in that the structure is curved convexly toward the inside of the exhaust passage to guide the combustion gas downward toward the combustion furnace when it rotates downward. According to claim 1,
The pellet providing unit 120,
Mounted adjacent to the lower surface of the pellet storage space 111, a pellet receiving port 122 that can accommodate the pellets stored in the pellet storage space 111 by its own weight is formed on one side, and the combustion furnace ( 140) a tubular transfer path 121 in which the pellet outlet 123 for providing the pellets is formed; and
It has a structure that is inclined at a certain angle in the direction from the tubular transfer path 121 to the combustion furnace 140 and extends from the tubular transfer path 121 to the combustion furnace 140 in the middle with respect to the straight transfer direction. Pellet fireplace, characterized in that the bypass (121a) is formed to bypass the According to claim 1,
The combustion gas exhaust unit 190 is
A first combustion gas exhaust path 161 that communicates with the upper space of the combustion furnace 140 and is installed adjacent to the warm air providing pipe 170 to perform heat exchange with the warm air providing pipe 170 . includes;
The combustion gas exhaust path (161) and the hot air supply pipe (170) is a pellet fireplace, characterized in that formed in a structure that performs a cylindrical shell-and-tube type heat exchange. According to claim 1,
The combustion gas exhaust unit 190, a pellet fireplace, characterized in that the photocatalyst and anion catalyst capable of collecting fine dust and nitrogen oxides (NOx) and sulfur oxides (SOx) contained in the combustion gas are mounted. [Claim 10] In the method of preheating the pellet fireplace according to any one of claims 1 to 4, 6 to 9,
When the temperature of the external air sucked into the combustion air providing unit 150 is below a certain temperature, the heat transfer unit 200 is operated to preheat the combustion air provided through the combustion air providing unit 150, and the amount of the combustion air an ignition preparation step of controlling the amount of combustion air provided through the combustion air providing unit 150 by the adjusting unit 210 to a minimum amount; and
when the combustion air is preheated, an ignition step of adjusting the combustion air to a maximum amount by the combustion air amount adjusting unit 210 and adjusting the exhaust amount to a minimum amount by the exhaust amount adjusting unit 166;
Preheating method of a pellet fireplace comprising a. 11. The method of claim 10,
In the ignition preparation step, the exhaust amount control unit 166 is a method of preheating a pellet fireplace, characterized in that to adjust the exhaust amount to the maximum amount. 11. The method of claim 10,
The ignition step is a preheating method of a pellet fireplace, characterized in that the set preheating time has elapsed, and is terminated when the combustion temperature of the combustion furnace side is above a certain temperature. 11. The method of claim 10,
The ignition preparation step is a preheating method of a pellet fireplace, characterized in that providing heated pellets by operating the pellet heating unit (126). In the preheating method of the pellet fireplace of claim 2,
When the temperature of the external air sucked into the combustion air providing unit 150 is below a certain temperature, the heat transfer unit 200 is operated to preheat the combustion air provided through the combustion air providing unit 150, and the amount of the combustion air an ignition preparation step of controlling the amount of combustion air provided through the combustion air providing unit 150 by the adjusting unit 210 to a minimum amount; and
When the combustion air is preheated, an ignition step of adjusting the combustion air to a maximum amount by the combustion air amount adjusting unit 210 and adjusting the exhaust amount to a minimum amount by the exhaust amount adjusting unit 166; includes,
The ignition step is
a first process of operating the heat transfer unit 200 to preheat combustion air by the heat transfer unit 200 and the preheating heat exchange unit 220;
and a second process of stopping the heat transfer unit 200 and preheating the combustion air by the preheating heat exchange unit 220 when the temperature of the combustion gas exhausted to the preheating heat exchange unit 220 is above a certain temperature. A method of preheating a pellet fireplace with

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