KR20220114823A - Combustion apparatus of boiler for solid fuel - Google Patents

Abstract

The present invention relates to the combustion apparatus of a boiler for solid fuel. The combustion apparatus comprises: a rotary shaft installed through the inside of the combustion chamber of a boiler, and rotated by receiving power from a driving source; a fuel transfer member formed to have curved surfaces from the outer surface of the rotary shaft toward the outside, for transferring solid fuel while rotating together with the rotary shaft, and provided in a first half of the transfer path of the solid fuel; a support member for connecting and supporting the rotary shaft and the fuel transfer member; at least one fuel mixing protrusion provided on the outer surface of the fuel transfer member to mix the solid fuel while rotating together with the rotary shaft; and a re-transfer member provided on the outer surface of the rotary shaft to wrap an outer side thereof in a spiral shape, and provided in a rear half of the transfer path of the solid fuel to discharge sludge and ash generated during combustion of the solid fuel. Therefore, the combustion apparatus can evenly spread and turn the solid fuel to actively transfer the solid fuel, thereby increasing the combustion efficiency of the boiler.

Description

Combustion device of boiler for solid fuel

The present invention relates to a combustion apparatus for a boiler for solid fuel, and more particularly, to a combustion apparatus for a boiler for solid fuel that can effectively discharge sludge and improve combustion efficiency by using a solid fuel such as wood pellets.

Recently, as the problem of climate change due to global warming has emerged as a serious threat to human survival, interest in new and renewable energy is increasing, and investment to replace existing fossil fuels is rapidly increasing. Accordingly, nationally, green technology projects are encouraged and support for this is increasing.

In this regard, research on boilers using biomass solid fuels, unlike conventional boilers using coal, is being actively conducted. Biomass is an organism that uses plants or microorganisms as an energy source, and biomass produced for one year on Earth is equivalent to the total amount of oil reserves, so if used properly, there is no fear of depletion.

These biomass solid fuels are used as renewable energy extracted from wastes such as energy-only crops and trees, agricultural products and fodder crops, and farm waste and dregs.

Current boiler combustion methods for using biomass solid fuel include a conveyor belt or chain driven moving grate method used for coal as fuel, a burner type, crucible type, and dish type mainly used for burning wood pellets. etc.

The present applicant has applied for a combustion device for a solid fuel boiler (registration No. 10-1026191) for the treatment of sludge and ash, which are frequently generated when burning low-quality wood pellets. In the combustion device disclosed in the above patent, the fuel conveying means 14 is formed in the form of a pedal and has a structure connected to the rotating shaft 12 by a pair of support parts 17 .

However, since the fuel transfer means 14 is connected by the pair of support parts 17 as described above, there is a problem in that the water supplied to the inside cannot circulate more smoothly. If the circulation of water is not smooth, the rotation shaft 12 is often bent due to high heat. In addition, since the number of the supporting parts 17 increases and the number of welding parts increases, there is also a problem that adversely affects the durability of the rotating shaft 12 . In addition, there was a problem that the fuel transfer means 14 disposed in the latter part of the transfer path of the solid fuel did not smoothly discharge the sludge and ash.

Republic of Korea Patent Publication No. 10-1026191 (2011.03.24)

An object of the present invention is to provide a combustion apparatus for a boiler for solid fuel having durability that can withstand high temperatures while effectively discharging sludge and ash generated during combustion of solid fuel in the boiler.

In addition, by making the shape of the ash conveying member disposed in the latter part of the solid fuel transport path spiral and not including the fuel mixing protrusion, it is possible to effectively discharge the sludge and ash in the latter part to provide a combustion device for a solid fuel boiler. will be.

The technical problems to be achieved by the present invention are not limited to the technical problems mentioned above, and other technical problems not mentioned will be clearly understood by those of ordinary skill in the art to which the present invention belongs from the description below. will be able

According to one embodiment of the present invention, the present invention is installed through the inside of the combustion chamber of the boiler, the rotating shaft is rotated by receiving power from a driving source; a fuel transfer member formed in a curved surface toward the outside from the outer surface of the rotary shaft, transferring solid fuel while rotating with the rotary shaft, and provided in the first half of the solid fuel transfer path; a support member connecting and supporting the rotation shaft and the fuel transfer member; at least one fuel mixing protrusion provided on the outer surface of the fuel transfer member to mix the solid fuel while rotating together with the rotation shaft; and a ash transfer member provided to surround the outer surface of the rotation shaft in a spiral form, and provided in the second half of the transfer path of the solid fuel to discharge sludge and ash generated during combustion of the solid fuel, wherein The rotary shaft, the fuel mixing member and the support member are formed in a hollow shape to communicate with each other, and the re-transfer member is formed in a hollow shape to communicate with the rotary shaft, and water for cooling is supplied along the communicating interior and can be circulated. .

A blocking wall may be installed inside the rotation shaft to be positioned between the support members.

A blocking wall may be installed inside the rotation shaft to be positioned between the re-transfer members.

A hollow part having a diameter smaller than that of the rotation shaft is formed inside the rotation shaft, so that the water may be circulated between the inner surface of the rotation shaft and the outer surface of the hollow part.

The fuel transfer member may be formed to draw a parabola backward from the outer surface of the rotation shaft, and the support member may extend vertically from the rear end of the fuel transfer member to the outer surface of the rotation shaft.

A plurality of the re-transfer members are provided on the outer surface of the rotation shaft, and the re-transfer members may have a spiral shape having a constant pitch.

According to an embodiment of the present invention, the solid fuel can be evenly spread and turned over, so that the solid fuel can be actively transferred, so that the combustion efficiency of the boiler can be improved.

In addition, it is possible to prevent the rotation shaft from being bent due to high heat because the circulation of water supplied to the inside of the rotation shaft is made in a smooth structure.

In addition, by making the shape of the ash conveying member disposed in the latter part of the solid fuel transport path spiral and not including the fuel mixing protrusion, the sludge and ash in the latter part can be effectively discharged.

1 is a view showing a combustion apparatus of a boiler for solid fuel according to an embodiment of the present invention.
2 is a view showing a flow path of water supplied to the combustion device of the boiler for solid fuel according to an embodiment of the present invention.
3 is a longitudinal cross-sectional view showing the first half of the combustion apparatus of the boiler for solid fuel according to an embodiment of the present invention.

Since the present invention can apply various transformations and can have various embodiments, specific embodiments are illustrated in the drawings and described in detail. However, this is not intended to limit the present invention to specific embodiments, and should be understood to include all modifications, equivalents, and substitutes included in the spirit and scope of the present invention. In describing the present invention, if it is determined that a detailed description of a related known technology may obscure the gist of the present invention, the detailed description thereof will be omitted.

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

The terms used in the present application are only used 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 the present application, terms such as "comprises" or "have" are intended to designate that the features, numbers, steps, operations, components, parts, or combinations thereof described in the specification exist, but one or more other features It is to be understood that this does not preclude the possibility of the presence or addition of numbers, steps, operations, components, parts, or combinations thereof.

Hereinafter, an embodiment of a combustion apparatus for a boiler for solid fuel according to the present invention will be described in detail with reference to the accompanying drawings, and in the description with reference to the accompanying drawings, the same or corresponding components are given the same reference numerals. and a redundant description thereof will be omitted.

1 is a view showing a combustion apparatus of a boiler for solid fuel according to an embodiment of the present invention, and FIG. 2 is a view showing a flow path of water supplied to a combustion apparatus of a boiler for solid fuel according to an embodiment of the present invention. , Figure 3 is a longitudinal cross-sectional view showing the first half of the combustion apparatus of the boiler for solid fuel according to an embodiment of the present invention.

As shown, the combustion apparatus of the boiler for solid fuel according to the present invention includes a rotary shaft 12 installed through the combustion chamber 6 of the boiler and rotated by receiving power from the driving source 2; a fuel conveying member 14 formed in a curved surface from the outer surface of the rotating shaft 12 toward the outside, rotating together with the rotating shaft 12 to transport solid fuel, and provided in the first half of the solid fuel transport path; a support member 16 for connecting and supporting the rotary shaft 12 and the fuel transfer member 14; at least one fuel mixing protrusion 20 provided on the outer surface of the fuel transfer member 14 to mix the solid fuel while rotating together with the rotation shaft 12; and a ash conveying member 30 provided to surround the outside in a spiral form from the outer surface of the rotary shaft 12, and provided in the latter half of the solid fuel transport path to discharge sludge and ash generated during combustion of the solid fuel ) may be included.

The exterior of the boiler for solid fuel in which the combustion device is installed is formed by a main body (not shown). The body heats the water passing through the internal pipe using the combustion heat generated by burning the biomass solid fuel and heat exchange is performed. For this purpose, a combustion chamber 6 having a predetermined space is formed inside the body. Referring to FIG. 3 , a plurality of air injection holes 4 are formed on the bottom surface of the main body along the front and rear sides of the combustion chamber 6 . The air injection hole 4 is a portion into which air for accelerating combustion of the solid fuel is injected. A plurality of air injection holes 4 may be formed at close intervals at the point where combustion starts, and may be formed at wider intervals toward the point at which combustion ends.

Referring to FIG. 1 , a combustion device 10 for burning solid fuel is installed in the combustion chamber 6 of the lower part of the body. The combustion device 10 is installed long in the front and rear at the lower part of the main body and serves to burn the supplied solid fuel.

A rotating shaft 12 is installed in the interior of the combustion device 10 in a forward and backward direction. The rotating shaft 12 is rotated by receiving power from the driving source 2 installed in the main body.

A fuel transfer member 14 is provided on the outer surface of the rotating shaft 12 to be curved toward the outside. The fuel conveying member 14 is substantially integrally provided on the outer surface of the rotating shaft 12, and while rotating together with the rotating shaft 12, conveys the solid fuel forward and at the same time pushes sludge and ash including the solid fuel forward. It serves to expel. That is, the fuel transfer member 14 evenly spreads and turns the injected solid fuel so that the fire can be ignited for a long time during combustion, thereby improving combustion efficiency.

The fuel conveying member 14 is formed to draw a parabola from the outer surface of the rotating shaft 12 toward the outside as well shown in the drawings. This is to increase the area in which the fuel conveying member 14 comes into contact with the solid fuel toward the outside, and since the fuel conveying member 14 becomes flatter toward the outside, it is possible to more efficiently spread the solid fuel evenly.

In addition, the rear end of the fuel transfer member 14 is connected to the rotation shaft 12 by the support member 16 . The support member 16 is vertically connected to the outer surface of the rotation shaft 12 to support the fuel transfer member 14 . The support member 16 may communicate with each other with the support member 16 or the fuel transfer member 12 positioned opposite to the rotation shaft 12 .

The rotation shaft 12, the fuel transfer member 14 and the support member 16 described above are preferably made of a hollow pipe and are formed to communicate with each other. In addition, a flow path is formed in the communicating interior, and water is supplied to the flow path. The water supply may be, for example, water in a boiler water pipe. The reason that water is supplied to the inside of the rotating shaft, the fuel transfer member 14 and the support member 16 is to prevent the parts from melting or deforming due to the high heat generated during combustion.

Conventionally, the above-described fuel transfer member 14 is connected only by the support member 16 and the fuel transfer member 14 is connected so as to be located outside the rotary shaft 12, but in this embodiment, the fuel transfer member 14 ) is configured to extend directly from the outer surface of the rotary shaft 12 to be formed. This is because the fuel transfer member 14 is connected only by the support member 16 , and when water flows inside, the water flow is not good and the rotation shaft 12 is deformed. In addition, since there is a problem that the support member 16 is deformed at the welded portion one by one, the fuel transfer member 14 is directly connected to the rotating shaft 12 .

Next, the blocking walls 18 are installed on the rotation shaft 12 at predetermined intervals. The blocking wall 18 is installed inside the hollow rotating shaft 12 , and serves to form a flow path for water supplied to the rotating shaft 12 . In particular, the blocking wall 18 is preferably installed to be positioned between the support members 16 or installed to be positioned between the re-transfer members 30 to be described later. In this way, when the blocking wall 18 is installed inside the rotating shaft 12, the water supplied to the inside circulates only within a certain pitch, so a smoother flow is possible, thereby preventing the rotating shaft 12 from being bent by high heat. can

Meanwhile, at least one fuel mixing protrusion 20 is provided on the outer surface of the fuel transfer member 14 . The fuel mixing protrusion 20 is rotated together with the rotating shaft 12 to serve as a mixing role to evenly spread and turn the solid fuel over. In an actual boiler, the solid fuel is transferred at a fine speed, and at this time, the solid fuel accumulated on the floor may not be transferred normally only by the fuel transfer member 14 . Therefore, the fuel mixing protrusion 20 serves to micro-transfer the solid fuel directly laid on the floor. The fuel mixing protrusion 20 is inclined at a predetermined angle with respect to the extending direction of the fuel transfer member 14 to be in charge of transferring the solid fuel.

A hollow portion 19 having a smaller diameter than that of the rotation shaft 12 may be formed inside the rotation shaft 12 . The hollow part 19 may be formed long from the front end to the rear end of the rotation shaft 12, and is preferably formed in a region where water is substantially supplied and circulated. In this embodiment, the hollow portion 19 is formed inside the rotating shaft 12 as described above in order to substantially allow water to circulate between the inner surface of the rotating shaft 12 and the outer surface of the hollow portion 19 . When the water is circulated in this way, since the water is circulated in a smaller flow space, the cooling effect on the rotating shaft 12 is increased, so that it is possible to prevent the rotating shaft 12 from being bent due to high heat.

The rotation shaft 12, the fuel transfer member 14, and the support member 16 described above may be arranged in various shapes according to the size and capacity of the boiler. For example, in a small boiler such as for home use, a single rotary shaft 12, a fuel transfer member 14, and a support member 16 may be disposed, and in a large boiler such as an industrial one, the rotary shaft 12 with a large or multiple rows. , the fuel transfer member 14 and the support member 16 may be disposed in parallel.

The fuel transfer member 14 and the support member 16 are mainly installed in the first half of the solid fuel transfer path. Here, the first half refers to an upstream part of the solid fuel transfer path and will be referred to as the second half as it goes downstream. The ash transfer member 30 is provided in the second half of the transfer path of the solid fuel.

It is preferable that the re-transfer member 30 is provided so as to extend from the outer surface of the rotation shaft 12 and surround the outer surface in a spiral shape. In this embodiment, the ash conveying member 30 serves not only to discharge the sludge and ash generated during combustion of the solid fuel, but also to transport the solid fuel like the fuel conveying member 14 .

The reason why the re-transfer member 30 is provided in the second half of the transfer path of the solid fuel is as follows. The solid fuel is burned in the process of being transferred forward by the fuel transfer member 14, and the solid fuel, which was relatively large in the first half, is changed to ashes through combustion. Therefore, if it goes beyond the middle part of the solid fuel transport path to the latter part, it is required to discharge the generated ash and sludge rather than transport the solid fuel to increase the combustion efficiency.

Therefore, in this embodiment, the fuel mixing protrusion 20 serving to transfer the main solid fuel is not provided on the re-transfer member 30 . And, the ash conveying member 30 is provided in close contact with the inner surface of the combustion chamber 6 and has a spiral shape so that the ash and sludge can be discharged more effectively.

The ash conveying member 30 is formed in a pipe shape to effectively discharge ash and sludge and communicates with the rotating shaft 12, and may be formed as a whole. However, since sagging may occur when the length of the pipe is increased, the re-transfer member 30 may be formed to have a constant pitch. In this embodiment, the re-transfer member 30 disposed in the second half of the rotary shaft 12 was disposed to have 1.5 pitches, 1.5 pitches, and 0.5 pitches, respectively. Of course, this is merely an example, and the re-transfer member 30 may be arranged to have various pitches according to the size of the combustion chamber 6, the diameter of the pipe, and the like.

Although the above has been described with reference to specific embodiments of the present invention, those of ordinary skill in the art may vary the present invention within the scope without departing from the spirit and scope of the present invention described in the claims below. It will be understood that modifications and changes can be made to

2: drive source 4: air injection hole
6: combustion chamber 10: combustion device
12: rotation shaft 14: fuel transfer member
16: support member 18: barrier wall
19: hollow part 20: fuel mixing projection
30: re-transfer member

Claims (6)

a rotating shaft installed through the combustion chamber of the boiler and rotated by receiving power from a driving source;
a fuel transfer member formed in a curved surface toward the outside from the outer surface of the rotary shaft, transferring the solid fuel while being rotated together with the rotary shaft, and provided in the first half of the solid fuel transfer path;
a support member connecting and supporting the rotary shaft and the fuel transfer member;
at least one fuel mixing protrusion provided on the outer surface of the fuel transfer member to mix the solid fuel while rotating together with the rotation shaft; and
It is provided so as to surround the outside in a spiral form from the outer surface of the rotary shaft, and is provided in the latter half of the transfer path of the solid fuel to discharge the sludge and ash generated during the combustion of the solid fuel.
The rotary shaft, the fuel mixing member and the support member are formed in a hollow shape to communicate with each other, and the re-transfer member is formed in a hollow shape to communicate with the rotary shaft, and water for cooling is supplied along the communicating interior and circulating. A combustion device for a boiler for solid fuel, characterized in that it. The method of claim 1,
A combustion device for a boiler for solid fuel, characterized in that a blocking wall is installed inside the rotation shaft to be positioned between the support members. The method of claim 1,
A combustion device for a solid fuel boiler, characterized in that a blocking wall is installed inside the rotating shaft to be positioned between the re-transfer members. The method of claim 1,
A hollow part having a diameter smaller than that of the rotation shaft is formed inside the rotary shaft, so that the water is circulated between the inner surface of the rotary shaft and the outer surface of the hollow part. The method of claim 1,
The fuel transfer member is formed to draw a parabola backward from the outer surface of the rotary shaft, and the support member extends vertically from the rear end of the fuel transfer member to the outer surface of the rotary shaft. The method of claim 1,
A plurality of the ashes conveying members are provided on the outer surface of the rotating shaft, and the ashes conveying members have a spiral shape having a constant pitch.

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