KR102258485B1 - Structure for supporting herbaceous biomass including bamboo and system for combusting herbaceous biomass including bamboo having the same - Google Patents

Abstract

The present invention relates to a combustion system exclusively for herbal-based fuels including bamboo, which is one of biomass fuels, and in detail, it is formed in an arcuate shape to prevent bending downwards due to the load of the herbal-based fuel, and at high temperatures. Even if warpage occurs due to thermal deformation due to long-time use, it can be easily reversed and reused, allowing for semi-permanent use.Since the structure is simple and light, it is easy to replace, and it is possible to improve combustion efficiency while dramatically reducing the manufacturing cost. It relates to a structure for supporting herbaceous fuel including bamboo, and a combustion system exclusively for herbaceous fuel having the same.

Description

Structure for supporting herbaceous fuel including bamboo, and combustion system exclusively for herbaceous fuel equipped with it {STRUCTURE FOR SUPPORTING HERBACEOUS BIOMASS INCLUDING BAMBOO AND SYSTEM FOR COMBUSTING HERBACEOUS BIOMASS INCLUDING BAMBOO HAVING THE SAME}

The present invention relates to a combustion system exclusively for herbal-based fuels including bamboo, which is one of biomass fuels, and in detail, it is formed in an arcuate shape to prevent bending downwards due to the load of the herbal-based fuel, and at high temperatures. Even if warpage occurs due to thermal deformation due to long-time use, it can be easily reversed and reused, allowing for semi-permanent use.Since the structure is simple and light, it is easy to replace, and it is possible to improve combustion efficiency while dramatically reducing the manufacturing cost. It relates to a structure for supporting herbaceous fuel including bamboo, and a combustion system exclusively for herbaceous fuel having the same.

In recent years, interest in new fuels as new and renewable energy is increasing in a situation where traditional energy resources such as coal, gas, and oil are insufficient. Among them, biomass fuel is attracting attention as an alternative fuel because it can reduce greenhouse gases because its carbon dioxide emission is significantly lower than that of traditional energy resources such as fossil fuels.

Biomass fuel is a natural resource: food waste, sludge, livestock manure, organic resources such as animal and plant residues, forest trees such as purified wood, felling wood, woody systems such as waste wood or thin wood residues, rapeseed, corn, rice straw. , There is a herbaceous system such as rice husk, and a marine system such as seaweed.

Among these biomass fuels, bamboo is attracting attention as an alternative fuel due to its excellent growth and fertility, and its effects. In particular, in the case of Japan, since bamboo grows abundantly over a wide area, the supply of fuel is smooth, and research and development to use bamboo as an alternative fuel has been actively conducted, and is currently used as an alternative fuel for fossil power plants.

In keeping with these currents, a project is underway in Korea to regenerate as new energy raw materials using waste porridge and nojuk scattered throughout the region. In other words, efforts are being made to seek to increase the income of local bamboo forest farmers as well as reduce fine dust, which has emerged as an international environmental problem, through a recycling project that uses bamboo as an alternative fuel.

However, since bamboo has a relatively high combustion temperature, when it is burned using a general combustion furnace, the durability of the ash support for fuel is deteriorated due to thermal deformation, and the ash support cannot overcome the weight of the bamboo fuel and is bent downward. There was a problem. In addition, when bamboo is burned in a general combustion furnace because the softening temperature of the remaining ash after burning is low, clinker is generated, which damages the combustion furnace.

KR 10-1753869 B1, 2017. 06. 28. KR 10-2008-0090243 A, 2008. 10. 08.

Accordingly, the present invention has been proposed to solve the above problems, and has the following objects.

First, an object of the present invention is to provide a structure for supporting herbal fuels including bamboo capable of preventing the bending phenomenon in which the reboard is bent down even when used for a long time at high temperature.

Second, the present invention has another object to provide a structure for a herbaceous fuel bearing, including bamboo, which enables reuse of the ash support even if a bending phenomenon occurs due to thermal deformation of the ash support.

Third, another object of the present invention is to provide a structure for supporting herbal-based fuels including bamboo that can improve combustion efficiency by improving the amount of ignition during combustion of herbal-based fuels.

Fourth, the present invention has another object to provide a combustion system exclusively for herbal-based fuels capable of completely burning the herbal-based fuel to reduce soot and clinker generated in the combustion process.

The structure for supporting herbal-based fuels including bamboo according to the present invention comprises: a support provided in a plurality of parallel to the inner bottom of the first combustion chamber into which the herbal-based fuel including bamboo is injected; And it is installed in a direction orthogonal to the pedestal, both ends are supported on the upper portion of the pedestal, and includes a re-support made of an arcuate structure convex upward from both ends toward the center.

In addition, the re-support may be fitted with an end portion to a coupling groove formed on the upper portion of the pedestal to facilitate replacement and cleaning.

In addition, a first air nozzle that passes through the bottom of the first combustion chamber and the pedestal and then is exposed to the top of the pedestal to supply combustion air into the first combustion chamber; And air required for re-burning the char-like combustion ash having a large standard among the combustion ash generated after combustion of the herbal fuel by being installed at the bottom of the first combustion chamber at a height lower than the height of the first air nozzle. It may further include a second air nozzle supplied to the interior of the first combustion chamber.

In addition, a plurality of the second air nozzles may be installed in a row or in multiple rows between the pedestal, and may be formed in the form of a straight bar nozzle.

In addition, the herbal-based fuel-only combustion system according to the present invention comprises: a first combustion chamber into which herbal-based fuels including bamboo are injected; A structure for supporting herbaceous fuel including bamboo according to any one of claims 1 to 4, which is installed on the inner floor of the first combustion chamber to support the herbaceous fuel injected into the first combustion chamber; A second combustion chamber installed at the discharge end of the first combustion chamber to recombust incomplete combustion gas generated during the primary combustion of the herbal fuel in the first combustion chamber; And a connection duct installed at the discharge end of the second combustion chamber to supply the combustion gas re-burned in the second combustion chamber to the boiler side.

In addition, third and fourth air nozzles are installed in the second combustion chamber, and the third air nozzle receives combustion air through an air duct provided to surround the second combustion chamber, and the combustion air is introduced into the second combustion chamber. And the fourth air nozzle injects compressed air to the outlet of the second combustion chamber to form an air curtain orthogonal to the direction in which the combustion gas is discharged, thereby increasing the residence time of the combustion gas in the second combustion chamber. I can.

In addition, the connection duct may include a first connection pipe connected to the discharge end of the second combustion chamber; A second connection pipe connected to the boiler tube; An expansion pipe interconnecting the first and second connection pipes; And installed in the center of the expansion pipe so as to be orthogonal to the discharge direction of the combustion gas, and has a convex arcuate structure toward the inlet of the expansion pipe, and a plurality of holes through which the combustion gas passes are formed so that the combustion gas passes through the combustion gas. It may include a diaphragm to which the clinker included in is attached.

In addition, the sum of the total inner diameters of the holes formed in the diaphragm may be the same as the inner diameter of the inlet of the expansion tube so as not to interfere with the flow of the combustion gas passing through the expansion tube.

In addition, the diaphragm is installed so as to be able to be inserted and withdrawn from the expansion tube, and when removing the clinker attached to the surface, the clinker attached to the surface of the diaphragm may be removed by grinding after separating the diaphragm from the expansion tube. I can.

As described above, according to the embodiment of the present invention, the following effects can be obtained.

First, the present invention can prevent a bending phenomenon in which the re-support is bent downward even when used for a long time at high heat.

Second, in the present invention, even if a bending phenomenon occurs due to thermal deformation of the re-support, the re-support can be reused.

Third, the present invention can improve the combustion efficiency by improving the amount of ignition during combustion of herbal fuels including bamboo.

Fourth, the present invention can reduce soot and clinker generated in the combustion process by completely burning herbal fuels including bamboo.

1 is a view as viewed from above of a cross-section of a combustion system exclusively for herbal fuels according to an embodiment of the present invention.
2 is a side view of a cross-sectional view of a combustion system exclusively for herbal fuels according to an embodiment of the present invention.
3 is a cross-sectional view of a combustion system exclusively for herbal-based fuels according to an embodiment of the present invention as viewed from another side.
FIG. 4 is an enlarged view of a part of the structure for supporting herbal fuel shown in FIG. 1;
5 is an enlarged view of a part of the structure for supporting the herbal fuel shown in FIG. 2.
Figure 6 is a view viewed from the side by expanding the re-support according to the present invention.
7 is a view showing a second combustion chamber according to the present invention.
8 is a view showing a second combustion chamber according to another example of the present invention.
9 is an enlarged view showing a connection duct according to the present invention.
Figure 10 is a view showing the expansion tube shown in Figure 9;
11 is a view showing the diaphragm shown in FIG. 9;

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

Advantages and features of the present invention, and a method of achieving them will become apparent with reference to embodiments to be described later in detail together with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but may be implemented in various different forms.

All terms (including technical and scientific terms) used in the present specification may be used as meanings that can be commonly understood by those of ordinary skill in the art to which the present invention belongs. In addition, terms defined in a commonly used dictionary are not interpreted ideally or excessively unless explicitly defined specifically.

1 is a cross-sectional view of a combustion system exclusively for herbal fuels according to an embodiment of the present invention as viewed from above, FIG. 2 is a side view, and FIG. 3 is a view viewed from another side.

1 to 3, a combustion system 10 for exclusive use of herbal-based fuels according to an embodiment of the present invention is a combustion device for burning herbal-based fuels including bamboo (hereinafter, referred to as'herbal fuels'), It is installed on the inner floor of the first combustion chamber 11 and supports the herbal fuel injected into the first combustion chamber 11, and the combustion ash generated after the combustion of the herbal fuel is transferred to the bottom of the first combustion chamber 11 It includes a structure 12 for supporting the herbaceous fuel to be discharged.

FIG. 4 is an enlarged view of a part of the structure for receiving herbal fuels shown in FIG. 1, and FIG. 5 is a view showing an enlarged view of a part of the structure for receiving herbal-based fuels shown in FIG. 2.

4 and 5, the structure for supporting herbal fuel according to the present invention 12 includes a pedestal 121 installed parallel to the inner bottom 11a of the first combustion chamber 11, and a pedestal 121 Both ends 122a are mounted on the pedestal 121 in a direction orthogonal to and include a re-support 122 made of an arcuate structure that is convex upward from both ends 122a to the center.

As shown in FIG. 5, the pedestal 121 has a rectangular block structure extending in one direction, and a plurality of the pedestal 121 may be installed on the inner bottom surface of the first combustion chamber 11 at regular intervals. The pedestal 121 is preferably made of a refractory material that does not soften at high heat of 1,100°C to 1,300°C, for example. For example, it is made of castable refractory (castable).

6 is an enlarged view of the re-support according to the present invention as viewed from the side.

4 to 6, the re-support 122 according to the present invention has a flat upper surface and a lower surface, and has a straight bar shape when viewed from above.

And, when viewed from the side, the re-support 122 may stably support the load of the herbaceous fuel placed on the upper part of the re-support 122 even if some heat deformation occurs in the re-support 122 due to high heat. It consists of a convex arched structure.

The backrest 122 has both ends 122a formed of a square block, that is, a cube or a rectangular parallelepiped, and the lower portions of the both ends 122a are inserted and fixed into the interior of a coupling groove (not shown) formed in the upper end of the pedestal 121 . At this time, the coupling groove is formed to have a width slightly larger than the width of both ends 122a of the re-support 122, and the depth is thinner than the thickness (height) of both ends 122a of the re-support 122 It is formed so that at least a part of both ends 122a of the re-support 122 may protrude to the upper portion of the coupling groove while at least a portion of the two ends 122a are inserted into the coupling groove.

As shown in FIG. 5, the re-support 122 has both ends 122a alternately supported on the pedestal 121. That is, the re-supports 122 may be installed in multiple rows in the second combustion chamber 11, and are supported between, for example, a first pedestal and a third pedestal, and between a third and a fifth pedestal. In addition, it may be supported between a pair of pedestal 121 disposed adjacent to each other, that is, between the first pedestal and the second pedestal, and the second pedestal and the third pedestal.

As the ash support 122 is installed inside the first combustion chamber 11 to support the herbal fuel, it maintains sufficient mechanical properties at high temperatures and prevents chemical reactions such as oxidation from being easily corroded by chlorine (Cl) from bamboo. It is made of heat-resistant cast steel that is resistant to well-bearing. For example, it may be made of a casting having a melting point of 1,500°C or higher, such as a casting roaster.

A first air nozzle 123 is installed in the first combustion chamber 11 to supply air required to burn the herbal fuel injected into the first combustion chamber 11 into the first combustion chamber 11.

The first air nozzle 123 is installed so as to be exposed to the top of the pedestal 121 after passing through the bottom portion 11a of the first combustion chamber 11 and the pedestal 121, and the outer side of the first combustion chamber 11 Receives air supplied from the press-fit blower 13 installed in the unit and supplies it to the upper portion of the pedestal 121.

As shown in FIG. 4, a plurality of such first air nozzles 123 are installed on each pedestal 121 in the longitudinal direction. At this time, the first air nozzle 123 is installed so as to be exposed to the upper center of the pedestal 121, one by one between the re-supports 122, and may be formed in a circular nozzle shape.

In addition, as shown in FIGS. 4 and 5, the combustion air used for re-burning the combustion ash of a rather large charcoal state among the combustion ash generated after combustion of the herbal-based fuel is provided inside the first combustion chamber 11. It further includes a second air nozzle 124 supplied to the inside of the combustion chamber (11).

A plurality of second air nozzles 124 may be installed in a row or multiple rows between the pedestal 121 so as to be parallel to the pedestal 121. And, in order to increase the additional combustion efficiency, it is made of a nozzle formed in a straight bar shape instead of a circular nozzle, and, like the first air nozzle 123, the air supplied from the press-in blower 13 is supplied and supplied.

The second air nozzle 124 is installed at a height lower than that of the first air nozzle 123 in order to additionally burn the combustion ash of a rather large charcoal state among the combustion ash generated after combustion of the herbal fuel. That is, as shown in FIG. 5, it is installed on the bottom portion 11a of the first combustion chamber 11.

The reason why the second air nozzle 124 is installed on the bottom part 11a of the first combustion chamber 11 is that the charcoal combustion ash having a large standard is applied to the pedestal 121 and the ash support 122 by the load. This is because it falls to the bottom 11a of the first combustion chamber 11 through the gap. That is, it is installed on the bottom portion 11a in order to more efficiently reburn the incomplete combustion ash falling to the bottom portion 11a.

As described above, in the present invention, the first and second air nozzles 123 and 124 are formed at different heights, and in particular, the second air nozzle 124 is installed on the bottom part 11a of the first combustion chamber 11. Among the combustion ash generated after the primary combustion of the herbal fuel, the combustion efficiency can be improved by further burning the char-like combustion ash of a somewhat larger standard to improve the ignition loss of the combustion ash.

As shown in FIGS. 1 and 2, the combustion system 10 dedicated for herbal-based fuels according to an exemplary embodiment of the present invention contains a large amount of combustion gas generated during the primary combustion of the herbal-based fuel in the first combustion chamber 11. It further includes a second combustion chamber 14 for re-burning by injecting a large amount of air.

7 is a view showing a second combustion chamber according to the present invention, (a) is a view viewed from the outlet side of the second combustion chamber, (b) is a view viewed from the side of the second combustion chamber.

Referring to FIG. 7, the second combustion chamber 14 has a cylindrical shape as an example, and, like the first combustion chamber 11, is made of a wall made of refractory material. In addition, a nozzle hole 14a is formed on the sidewall of the side wall at a predetermined interval and into which the third air nozzle 141 is inserted.

The third air nozzle 141 is provided to surround the second combustion chamber 14 and receives external air through the air duct 142 and supplies it to the inside of the second combustion chamber 14 through the nozzle hole 14a. At this time, as shown in FIG. 2, combustion air is supplied from the press-in blower 13 to the air duct 142.

In the process of burning the surface of bamboo combustion products, a large amount of combustion gas is generated, which causes the generation of soot. Accordingly, in the present invention, a second combustion chamber 14 is additionally installed at the discharge end of the first combustion chamber 11 (the rear end in the direction in which the combustion gas is discharged) to extend the combustion time as much as possible, and supply sufficient combustion air to reduce combustion gas. By allowing complete combustion, it is possible to provide an effect of reducing the generation of soot as well as clinker generated during the bamboo combustion process.

8 is a diagram illustrating a second combustion chamber according to another example of the present invention.

Referring to FIG. 8, the second combustion chamber 24 according to another example of the present invention further includes a fourth air nozzle 143 installed on the outlet 24a side to inject compressed air toward the outlet 24a.

The fourth air nozzle 143 injects compressed air into the discharge port 24a of the second combustion chamber 24 so as to be perpendicular to the discharge direction of the combustion gas to form an air curtain 24b at the discharge port 24a. Accordingly, incomplete combustion gas in the second combustion chamber 24 is not discharged by the air curtain 24b, and the residence time can be increased by being stagnated for a certain period of time in the second combustion chamber 24.

That is, the incomplete combustion gas stays in the second combustion chamber 24 for a long time due to the air curtain 24b formed by the fourth air nozzle 143, thereby improving the reburn rate of the combustion gas.

As shown in FIGS. 1 and 2, the combustion system 10 for exclusive use of herbal-based fuel according to an embodiment of the present invention further includes a connection duct 15 connecting the discharge end of the second combustion chamber 14 and the boiler.

9 is a view showing an enlarged connection duct according to the present invention, FIG. 10 is a view showing the expansion pipe shown in FIG. 9, and FIG. 11 is a view showing the diaphragm shown in FIG.

9 to 11, the connection duct 15 according to the present invention includes a first connection pipe 151 connected to the discharge end of the second combustion chamber 14, and a second connection pipe connected to the boiler tube ( It includes 152 and an expansion pipe 153 interconnecting the first and second connection pipes 151 and 152.

The first and second connecting pipes 151 and 152 are formed of a tube member having the same inner diameter, and the expansion pipe 153 is formed such that the central portion has an inner diameter larger than that of the first and second connecting pipes 151 and 152.

The inlet 153a and the outlet 153b of the expansion pipe 153 have the same inner diameter, and the center has a structure in which the inner diameter is expanded compared to the inlet 153a and the outlet 153b. In addition, a diaphragm 154 is installed in the center of which the inner diameter is expanded compared to the inlet port 153a and the outlet port 153b so as to be perpendicular to the discharge direction of the combustion gas to attach and remove clinker included in the combustion gas.

When vegetation systems such as bamboo are used as fuel, a large amount of clinker is generated during the combustion process and is attached to the tube of the heat recovery boiler. This reduces the heat recovery efficiency of the boiler and causes the life of the boiler to be shortened.

Accordingly, in the present invention, the diaphragm 154 is installed inside the expansion pipe 153 of the connection duct 15 so as to be orthogonal to the discharge direction of the combustion gas, and through this, the clinker included in the combustion gas is attached and removed to the boiler side. It is possible to reduce discharged clinker-causing components.

As shown in FIGS. 9 and 10, the diaphragm 154 has a convex arcuate structure toward the inlet 153a of the expansion pipe 153 and has a plurality of holes 154a through which combustion gas passes. At this time, the sum of the total inner diameters of the holes 154a formed in the diaphragm 154 so as not to interfere with the flow of the combustion gas passing through the expansion pipe 153 is formed equal to the inner diameter of the inlet 153a.

The diaphragm 154 may be made of special steel (casting) to maintain sufficient mechanical properties at high temperatures, and is installed to be exchangeable during regular inspection of the combustion furnace or during operation.

That is, the diaphragm 154 is installed so as to be able to be inserted and withdrawn from the expansion pipe 153, and when removing the clinker attached to the surface, the diaphragm 154 is separated from the expansion tube 153 and then removed by grinding. As such, the diaphragm 154 can be semi-permanently reused after washing.

On the other hand, the connection duct 15 is provided with a transfer member 16 additionally, the diaphragm 154 is introduced into the interior of the expansion pipe 153, or the diaphragm 154 installed in the expansion tube 153 is withdrawn to the outside. do.

The transfer member 16, for example, by linearly reciprocating the rod to which the diaphragm 154 is coupled to bring the diaphragm 154 into or out of the expansion pipe 153. At this time, the transfer member 16 may be made of a cylinder, and the cylinder may be a pneumatic, hydraulic, or electric cylinder.

Hereinafter, a process of burning the herbal-based fuel using the herbal-based fuel-only combustion system 10 according to an embodiment of the present invention will be briefly described with reference to FIGS. 1 to 11.

As shown in FIGS. 1 to 11, the herbal fuel is injected into the first combustion chamber 11 using the combustion material input member 17. In addition, the herbal-based fuel injected into the first combustion chamber 11 is placed on the upper portion of the herbal-based fuel supporting structure 12 installed in the bottom portion 11a of the first combustion chamber 11.

Thereafter, combustion air is continuously supplied from the bottom to the top of the first combustion chamber 11 through the first and second air nozzles 123 and 124, see FIGS. 4 and 5, and a burner device (not shown) is used. Thus, the herbal fuel placed on the base 121 and the re-support 122 is first combusted.

Thereafter, combustion air is supplied into the second combustion chamber 14 through the third air nozzle 141, and incomplete combustion gas that has not been completely burned is secondarily combusted in the second combustion chamber 14. At this time, a separate burner device may be used to burn the incomplete combustion gas once more.

Thereafter, the combustion gas secondary combustion in the second combustion chamber 13 is discharged to the connection duct 15 and is discharged to the boiler side through a hole 154a formed in the diaphragm 154 installed in the connection duct 15. At this time, in the process of passing through the hole (154a), the clinker included in the combustion gas is attached to the diaphragm (154). Then, the clinker attached to the diaphragm 154 is removed through a later grinding process.

Thereafter, the combustion gas discharged through the connection duct 15 is supplied to the boiler side.

On the other hand, the combustion ash completely burned in the first combustion chamber 11 is introduced into the transfer conveyor 19 through the combustion ash discharge pusher 18 installed on one side of the first combustion chamber 11 and discharged to the outside.

As described above, the technical idea of the present invention has been described in detail in the preferred embodiment, but the preferred embodiment is for the purpose of explanation and not limitation. As such, it will be understood by those of ordinary skill in the art that various embodiments are possible through a combination of the embodiments of the present invention within the scope of the technical idea of the present invention.

10: exclusive combustion system for herbal fuels 11: first combustion chamber
11a: bottom part 12: structure for supporting herbaceous fuel
13: press-in blower 14, 24: second combustion chamber
14a: nozzle hole 15: connection duct
16: transfer member 17: combustion material input member
18: combustion ash discharge pusher 19: transfer conveyor
24a: discharge port (second combustion chamber) 24b: air curtain
121: pedestal 122: re-support
122a: both ends (re-support) 123: first air nozzle
124: second air nozzle 141: third air nozzle
142: air duct 143: 4th air nozzle
151: first connector 152: second connector
153: expansion pipe 153a: inlet (expansion pipe)
153b: outlet (expansion pipe) 154: diaphragm
154a: Hall

Claims (9)

A plurality of supporters installed in parallel on the inner bottom of the first combustion chamber into which herbal fuels including bamboo are injected; And
Doedoe installed in a direction orthogonal to the pedestal, both ends are supported on the upper portion of the pedestal, the re-support made of an arc-shaped structure convex upward from both ends toward the center; Including,
The re-support is a structure for a herbaceous fuel support including bamboo whose end is fitted into a coupling groove formed on an upper portion of the support so as to facilitate replacement and cleaning.
delete The method of claim 1,
A first air nozzle that passes through the bottom of the first combustion chamber and the pedestal and is exposed to an upper portion of the pedestal to supply combustion air into the first combustion chamber; And
The air required to re-burn the char-like combustion ash having a large standard among the combustion ash generated after combustion of the herbal fuel is installed at the bottom of the first combustion chamber at a height lower than the height of the first air nozzle. A second air nozzle supplying the inside of the first combustion chamber;
Herbal fuel support structure including bamboo further comprising a.
The method of claim 3,
A plurality of second air nozzles are provided in a row or in multiple rows between the pedestal, and a structure for supporting herbal fuel including bamboo formed in the form of a straight bar nozzle.
A first combustion chamber into which herbal fuel including bamboo is injected;
A structure for supporting herbaceous fuel including bamboo according to any one of claims 1, 3, and 4, which is installed on the inner floor of the first combustion chamber to support the herbaceous fuel injected into the first combustion chamber;
A second combustion chamber installed at the discharge end of the first combustion chamber to recombust incomplete combustion gas generated during the primary combustion of the herbal fuel in the first combustion chamber; And
A connection duct installed at the discharge end of the second combustion chamber to supply the combustion gas re-burned in the second combustion chamber to the boiler side;
Herbal fuel-only combustion system comprising a.
The method of claim 5,
Third and fourth air nozzles are installed in the second combustion chamber, and the third air nozzle receives combustion air through an air duct provided to surround the second combustion chamber and supplies combustion air to the interior of the second combustion chamber. And, the fourth air nozzle is a herbal system for increasing the residence time of the combustion gas in the second combustion chamber by injecting compressed air to the outlet of the second combustion chamber to form an air curtain orthogonal to the direction in which the combustion gas is discharged. Fuel-only combustion system.
The method of claim 5,
The connection duct,
A first connection pipe connected to the discharge end of the second combustion chamber;
A second connection pipe connected to the boiler tube;
An expansion pipe interconnecting the first and second connection pipes; And
It is installed in the center of the expansion pipe so as to be orthogonal to the discharge direction of the combustion gas, and has a convex arcuate structure toward the inlet of the expansion pipe, and a plurality of holes through which the combustion gas passes are formed so that the combustion gas passes through the combustion gas. A diaphragm to which the included clinker is attached;
Herbal fuel-only combustion system comprising a.
The method of claim 7,
The sum of the total inner diameters of the holes formed in the diaphragm so as not to interfere with the flow of the combustion gas passing through the expansion pipe is the same as the inner diameter of the inlet of the expansion pipe is a combustion system for exclusive use of herbal-based fuels.
The method of claim 7,
The diaphragm is installed so as to be able to be inserted and withdrawn from the expansion tube, and when removing the clinker attached to the surface, the diaphragm is separated from the expansion tube and then the clinker attached to the surface of the diaphragm is removed by grinding. Fuel-only combustion system.

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