KR102215339B1 - Furnace for steam boiler - Google Patents

Abstract

A combustion furnace for a steam boiler according to the present invention includes: a combustion chamber in which an input portion into which fuel is injected is formed, and a heating means for burning the injected fuel is installed therein; A base housing disposed below the combustion chamber, having an internal accommodation space, and having an open upper portion; It is composed of a caterpillar type and is installed inside the base housing so as to continuously circulate from the top to the bottom, and the fuel injected into the combustion chamber is placed in the upper side and the ashes generated after being burned are plural to fall downward. The grate unit in which the discharge hole is formed; And an air supply unit installed inside the base housing and disposed below the upper portion of the grate unit to supply air to the fuel placed in the grate unit through the plurality of discharge holes. A pair of fixing frames each fixed to both sides of the inner upper end of the base housing; And an air supply nozzle assembly provided in plurality and spaced apart from each other along the length direction of the fixed frame in a direction perpendicular to the fixed frame, and both ends are fixed to the pair of fixed frames, respectively. do.

Description

Combustion furnace for steam boiler {FURNACE FOR STEAM BOILER}

The present invention relates to a combustion furnace for a steam boiler, and more particularly, to a combustion furnace for a steam boiler employing an air supply unit to maximize thermal efficiency by implementing an air curtain effect.

The boiler can be roughly classified into a heating boiler that supplies heating water or hot water depending on the application, and a steam boiler that produces steam used as a power source or hot air for processing.

Both types of boilers are manufactured in various forms to obtain optimum thermal efficiency. In the case of steam boilers, due to the nature of mass production of high-pressure steam, they are manufactured with a structure and configuration that enhances strength.

Steam boilers differ in the structure of the combustion furnace depending on the type of fuel, but basically, a bundle of complicated structures is provided inside the chamber so that heat generated from the combustion furnace is effectively transferred to the water. These will be put in alternately.

Bunker seed oil or gas has been mainly used as fuel for steam boilers, but the use of fossil fuels due to rising crude oil prices and global warming has been avoided. As alternative fuels, inexpensive wood pallets, wood chips and WCF, etc. Wood fuel is attracting attention.

The steam boiler for wood fuel includes a fuel processing unit in which wood fuel is placed, a combustion unit provided on the fuel processing unit, and a steam generating unit.

The fuel processing unit and the combustion unit are each provided with a grate and a vertical water pipe, and water that is preheated while passing through the grate and the vertical water pipe is collected in the steam generation unit, and is generated from the combustion unit in a pipe provided inside the steam generation unit. As the combustion gas is supplied, steam is generated from the water collected by the heat of the combustion gas.

The grate of a steam boiler according to the prior art is provided with a water pipe through which water to be preheated flows into and an air hole for combustion of wood fuel placed in the upper portion, and only wood fuel around the air hole is actively burned, and the air There is a problem in that a part of the ash is introduced into the air supply room provided at the lower portion through the hole, and thus thermal efficiency is deteriorated due to poor air supply.

In addition, the grate of a steam boiler according to the prior art has a cumbersome problem because it must be frequently cleaned as ash generated by combustion of fuel accumulates.

In addition, when the grate of the steam boiler according to the prior art is partially deformed by the high temperature heat generated while the fuel is combusted, the entire grate needs to be replaced, and thus there is a problem that it takes a lot of time and cost to replace.

KR 10-1535772 B1 (2015.07.24.announcement)

The present invention was conceived to solve the various problems of the prior art as described above, and an object of the present invention is to provide a combustion furnace for a steam boiler employing an air supply unit capable of maximizing thermal efficiency by implementing an air curtain effect. .

In order to achieve the above objects, the combustion furnace for a steam boiler according to the present invention includes: a combustion chamber in which an input portion into which fuel is injected is formed, and a heating means for burning the injected fuel is installed therein; A base housing disposed below the combustion chamber, having an internal accommodation space, and having an open upper portion; It is composed of a caterpillar type and is installed inside the base housing so as to continuously circulate from the top to the bottom, and the fuel injected into the combustion chamber is placed in the upper side and the ashes generated after being burned are plural to fall downward. The grate unit in which the discharge hole is formed; And an air supply unit installed inside the base housing and disposed below the upper portion of the grate unit to supply air to the fuel placed in the grate unit through the plurality of discharge holes. A pair of fixing frames each fixed to both sides of the inner upper end of the base housing; And an air supply nozzle assembly provided in plurality and spaced apart from each other along the length direction of the fixed frame in a direction perpendicular to the fixed frame, and both ends are fixed to the pair of fixed frames, respectively. do.

At this time, the air supply nozzle assembly, a body formed in the shape of a hollow pipe having a predetermined length to receive air from the outside; A first air supply nozzle protrudingly coupled to the outer circumferential surface of the body, provided in plurality and disposed at predetermined intervals along the length direction of the body; And a second air supply nozzle protrudingly coupled to the outer circumferential surface of the body such that an angle between the first air supply nozzle is 60° to 80°, and is provided in plural and disposed at predetermined intervals along the length direction of the body. Including, the body and the first air supply nozzle, the body and the second air supply nozzle is made to communicate with each other.

In addition, it is preferable that the first air supply nozzle and the second air supply nozzle are alternately disposed along the longitudinal direction of the body.

In addition, the first air supply nozzle and the second air supply nozzle are formed in the same shape, but the first air supply nozzle is formed with a nozzle A coupled to the outer circumferential surface of the body, and an inner diameter smaller than the inner diameter of the nozzle A. The second air supply nozzle is formed in two stages including the B nozzle extending from the A nozzle, and the second air supply nozzle has a C nozzle coupled to the outer circumferential surface of the body, and the inner diameter is formed smaller than the inner diameter of the C nozzle. It is preferable that it is formed in two stages including an extended D nozzle.

Meanwhile, between the plurality of first air supply nozzles and between the plurality of second air supply nozzles located at a portion corresponding to a portion where ignition starts in the grate unit may be densely disposed along the length direction of the body. .

According to the above-described problem solving means, the present invention has the following effects.

In the present invention, the grate rods adjacent to each other in the plurality of grate rods are formed in a shape that is obliquely twisted in opposite directions to form a plurality of discharge holes between the adjacent grate rods, so that the fuel injected into the combustion chamber is placed on the upper side of the grate unit The ash generated after combustion is made to fall downward through the discharge hole. Accordingly, since the grate unit is not clogged, there is an effect that there is no need to separately clean the grate unit.

In addition, according to the present invention, the grate unit is configured to fasten a plurality of unit grates to a track-type transfer conveyor having a fastening part, so that only the unit grate portion deformed by the high temperature heat generated while fuel is burned can be replaced. Accordingly, there is an advantage in that cost can be reduced and maintenance is convenient.

In addition, the present invention has an effect of maximizing thermal efficiency by implementing an air curtain effect by providing an air supply unit under the grate unit.

In addition, the present invention provides a first air supply nozzle and a second air supply nozzle formed to have a mutual angle of 60° to 80° on the outer circumferential surface of the body, so that air can be smoothly supplied over the entire area of the upper part of the grate unit. There is an effect.

In addition, the present invention provides an air supply unit between the upper and lower portions of the grate unit, thereby supplying air to the fuel and cooling the upper portion of the grate unit heated to 1500°C or higher in an air-cooling manner. It is possible to reduce the temperature of the lower part of the grate unit located below 30℃.

In addition, according to the present invention, by providing the ash collecting means and the ash discharging unit inside the base housing, the ash generated after being burned in the grate unit is automatically discharged to the outside of the base housing, thereby increasing convenience.

1 is a view showing the internal structure of a combustion furnace for a steam boiler according to the present invention.
FIG. 2 is a view showing the internal structure of the combustion furnace for the steam boiler of FIG. 1 as viewed from the side.
3 is a view showing a transfer conveyor to which a unit grate employed in a combustion furnace for a steam boiler according to the present invention is combined.
4 is a view showing a unit grate employed in the combustion furnace for a steam boiler according to the present invention.
5 is a view showing a grate rod in the unit grate of FIG. 4.
6 is a view showing an air supply unit employed in the combustion furnace for a steam boiler according to the present invention.
7 is a view showing a state as viewed from the front of FIG. 6.
8 is a view showing the air supply nozzle assembly in FIG. 6.
9 is a view showing a state as viewed from the front of FIG. 8.
10 is a view showing an air supply nozzle consisting of two stages in FIG. 9.
11 is a view showing another embodiment of an air supply unit employed in the combustion furnace for a steam boiler according to the present invention.

Hereinafter, a preferred embodiment of a combustion furnace for a steam boiler according to the present invention will be described in detail with reference to the accompanying drawings. For reference, terms and words used in the specification and claims should not be construed as being limited to their usual or dictionary meanings, and the inventors appropriately explain the concept of terms in order to explain their own invention in the best way. Based on the principle that it can be defined, it should be interpreted as a meaning and concept consistent with the technical idea of the present invention. In addition, the embodiments described in the present specification and the configurations shown in the drawings are only the most preferred embodiments of the present invention, and do not represent all the technical ideas of the present invention, so various alternatives that can be substituted for them at the time of application It should be understood that there may be equivalents and variations.

FIG. 1 is a view showing the internal structure of a combustion furnace for a steam boiler according to the present invention, and FIG. 2 is a view showing the internal structure of the combustion furnace for a steam boiler of FIG. 1 as viewed from a side direction.

The combustion furnace for a steam boiler according to the present invention includes a combustion chamber 10, a base housing 20, a grate unit 30, an ash collection means 50, and an ash discharge unit 60.

The combustion chamber 10 is formed in a dome shape, and an input portion 12 into which fuel is injected is formed on the upper side, and the lower side is opened to be coupled to the upper end of the base housing 20 to be described later.

Wood pellets are mainly used as fuel, and these wood pellets are fuels obtained by crushing sawdust such as forest waste or pine trees and then compressed into a cylinder shape.

It has a length of 3.0cm and a thickness of 0.6~0.8cm. It generates more heat than ordinary wood used for simple firewood and has a combustion rate of 95%, leaving almost no debris.

Even the little ash can be used as fertilizer for gardens or pots.

Its carbon emission is only one-twelfth of that of ordinary diesel, and it is in the spotlight as an eco-friendly fuel, which is why it is called as an advanced energy fuel.

As such, wood pallets were attracting attention as the most economical clean fuel, and various attempts were made to distort authenticity, but most of them were not certified tests, such as tests at facilities outside the standard.

Currently, wood pallets are subject to strict quality control by the Forest Service and related organizations, and various suspicions have been found to be untrue according to the relevant laws and scientific verification of the Ministry of Environment.

Meanwhile, a heating means (not shown) for burning the injected fuel is installed inside the combustion chamber 10, and a plasma torch or the like may be employed as the heating means. ) Is installed around the inner circumference of the combustion chamber 10 so as to face the fuel placed in the upper portion U of the).

The base housing 20 is disposed in the lower part of the combustion chamber 10, has an internal accommodation space, and has an open upper part, so that a grate unit 30, a re-collection means 50, and a re-discharge to be described later. A unit 60 and the like are installed.

The grate unit 30 is of a caterpillar type and is installed inside the base housing 20 so as to continuously circulate from the top to the bottom, and the fuel injected into the combustion chamber 10 is transferred to the upper side (U). A plurality of discharge holes (H) are formed so that the ash generated after being placed and burned falls downward.

This grate unit 30 will be described later with reference to FIGS. 3 to 5.

The ash collection means 50 is installed inside the base housing 20, and is disposed below the upper portion of the grate unit 30 to collect the ash falling after the fuel is burned in the upper portion U of the grate unit 30. As for collection, it may be formed in the form of a hopper 52 having upper and lower sides with open upper and lower sides.

The ash discharging unit 60 is installed inside the base housing 20 and disposed under the ash collecting unit 50 to discharge the ash collected by the ash collecting unit 50 to the outside of the base housing 20 As a result, the discharge conveyor 62 is arranged in a direction perpendicular to the transfer conveyor 32 of the grate unit 30 so that the ash collected from the ash collection means 50 is stacked and discharged to the outside of the base housing 20. Including.

In this case, a ash tray (not shown) may be provided on one side of the base housing 20 to collect ash discharged to the outside of the base housing 20 by the ash discharging unit 60.

3 is a view showing a transfer conveyor to which a unit grate employed in a combustion furnace for a steam boiler according to the present invention is coupled, and FIG. 4 is a view showing a unit grate employed in a combustion furnace for a steam boiler according to the present invention. 5 is a view showing a grate rod in the unit grate of FIG. 4.

The grate unit 30 is formed in a track type, but is disposed in the width direction of the transfer conveyor 32 and the transfer conveyor 32 in which a plurality of fastening parts 32a are formed at regular intervals along the length direction at both ends in the width direction. Doedoe consists of a unit grate 34 to which both ends are detachably coupled to the fastening part 32a.

In this way, the grate unit 30 is configured to fasten the plurality of unit grates 34 to the track-type transfer conveyor 32 on which the fastening part 32a is formed, so that the unit grate deformed by the high temperature heat generated while the fuel is burned ( 34) Only parts can be replaced. Accordingly, there is an advantage in that cost can be reduced and maintenance is convenient.

The unit grate 34 includes a frame portion 34a in the form of a frame having a predetermined length; A plurality of grate rods (34b) arranged in the width direction along the length direction of the frame portion 34a and coupled to each other, but formed in a shape that is obliquely twisted in one direction; And a coupling portion 34c that extends from both ends of the frame portion 34a in the longitudinal direction and is fastened to the fastening portion 32a formed on the transfer conveyor 32.

In the plurality of grate rods 34b, the grate rods 34b adjacent to each other are formed in a shape that is obliquely twisted in opposite directions to form a plurality of discharge holes H between the adjacent grate rods 34b.

As described above, the fuel injected into the combustion chamber 10 is placed in the upper portion U of the grate unit 30, and the ash generated after combustion is discharged into the discharge hole H (a discharge hole formed between adjacent grate rods 34b). As it is made to fall downward through the grate unit 30 is not clogged, there is no need to separately clean the grate unit 30.

6 is a view showing an air supply unit employed in the combustion furnace for a steam boiler according to the present invention, and FIG. 7 is a view showing a state as viewed from the front of FIG. 6.

The combustion furnace for a steam boiler according to the present invention is installed inside the base housing 20, and is disposed below the upper portion U in the grate unit 30 to provide a plurality of discharge holes H (adjacent grate rods 34b ), an air supply unit 40 for supplying air to the fuel placed in the grate unit 30 through a discharge hole formed therebetween may be further included.

In this way, by providing the air supply unit 40 between the upper portion (U) and the lower portion (L) of the grate unit 30, while supplying air to the fuel, the grate unit 30 heated to 1500°C or higher. By cooling the upper part U in an air-cooling manner, the temperature of the lower part L of the grate unit 30 located under the air supply unit 40 can be lowered to 30°C or less.

Such an air supply unit 40 includes a pair of fixing frames 42 fixed to both sides of the inner upper end of the base housing 20, respectively; And an air supply nozzle assembly provided in plural and spaced apart from each other along the length direction of the fixing frame 42 in a direction perpendicular to the fixing frame 42, and both ends are fixed to the pair of fixing frames 42, respectively ( 44); including.

At this time, the air supply nozzle assembly 44 includes a body 44a, a first air supply nozzle N1, and a second air supply nozzle N2.

The body 44a is formed in the shape of a hollow pipe having a predetermined length and receives air from the outside.

The first air supply nozzle N1 is coupled to protrude on the outer circumferential surface of the body 44a, and is provided in plural and disposed at predetermined intervals along the length direction of the body 44a.

The second air supply nozzle N2 is projected on the outer peripheral surface of the body 44a so that the angle between the first air supply nozzle N1 (the angle formed along the outer circumference of the body 44a) is 60° to 80°. Doedoe coupled, provided in plural and disposed at predetermined intervals along the length direction of the body 44a.

The body 44a and the first air supply nozzle N1, the body 44a and the second air supply nozzle N2 are made to communicate with each other.

In addition, it is preferable that the first air supply nozzle N1 and the second air supply nozzle N2 are alternately disposed along the length direction of the body 44a.

Accordingly, it is possible to smoothly supply air over the entire area of the upper portion U of the grate unit 30.

FIG. 8 is a view showing the air supply nozzle assembly in FIG. 6, FIG. 9 is a view showing a state viewed from the front of FIG. 8, and FIG. 10 is a view showing the air supply nozzle having two stages in FIG. 9.

The first air supply nozzle (N1) and the second air supply nozzle (N2) have the same shape, and the first air supply nozzle (N1) has an A nozzle (A) coupled to the outer circumferential surface of the body 44a, and an inner diameter It is formed in two stages including the nozzle B (B) which is formed smaller than the inner diameter of the nozzle A (A) and extends from the nozzle A (A).

In addition, the second air supply nozzle (N2) is a C nozzle (C) that is coupled to the outer circumferential surface of the body (44a) and a D nozzle whose inner diameter is smaller than the inner diameter of the C nozzle (C) and extends from the C nozzle (C). It is formed in two stages including (D).

In this way, by forming the first air supply nozzle (N1) and the second air supply nozzle (N2) in a two-stage shape with a smaller inner diameter, when supplying air to the grate unit 30, the flow rate of air is increased to make it more smooth. Air can be supplied.

11 is a view showing another embodiment of an air supply unit employed in the combustion furnace for a steam boiler according to the present invention.

On the other hand, between the plurality of first air supply nozzles (N1) located at a portion corresponding to the portion where ignition starts in the grate unit (30), and between the plurality of second air supply nozzles (N2), the body (44a) It can be arranged densely along the length direction.

Accordingly, more air is supplied to a portion where ignition starts, so that combustion can be performed smoothly and efficiently.

The present invention described above is not limited by the above-described embodiments and the accompanying drawings, and various substitutions, modifications, and changes are possible within the scope of the technical spirit of the present invention. It will be obvious to those of ordinary skill in the following.

10 combustion chamber 20 base housing
30: grate unit 32: transfer conveyor
34: unit grate 40: air supply unit
42: fixed frame 44: air supply nozzle assembly
50: ash collection means 60: ash discharging unit
62: discharge conveyor

Claims (4)

A combustion chamber in which an injection unit into which fuel is injected is formed, and a heating means for burning the injected fuel is installed therein;
A base housing disposed below the combustion chamber, having an internal accommodation space, and having an open upper portion;
It is composed of a caterpillar type and is installed inside the base housing so as to continuously circulate from the top to the bottom, and the fuel injected into the combustion chamber is placed in the upper side and the ashes generated after being burned are plural to fall downward. The grate unit in which the discharge hole is formed; And
An air supply unit installed inside the base housing and disposed below the upper portion of the grate unit to supply air to the fuel placed in the grate unit through the plurality of discharge holes; and
The air supply unit,
A pair of fixing frames fixed to both sides of the inner upper end of the base housing; And
Containing a plurality of air supply nozzle assemblies which are provided to be spaced apart from each other along the length direction of the fixed frame in a direction perpendicular to the fixed frame, and have both ends fixed to the pair of fixed frames, respectively, and
The air supply nozzle assembly,
A body in the form of a hollow pipe having a predetermined length to receive air from the outside;
A first air supply nozzle protrudingly coupled to the outer circumferential surface of the body, provided in plurality and disposed at predetermined intervals along the length direction of the body; And
A second air supply nozzle protrudingly coupled to the outer circumferential surface of the body so that the angle between the first air supply nozzle is 60° to 80°, and is provided in plural and disposed at predetermined intervals along the length direction of the body; Including,
The first air supply nozzle and the second air supply nozzle are alternately arranged along the longitudinal direction of the body,
The combustion furnace for a steam boiler, wherein the body and the first air supply nozzle, and the body and the second air supply nozzle are in communication with each other.
delete delete The method according to claim 1,
The first air supply nozzle and the second air supply nozzle are formed in the same shape,
The first air supply nozzle is formed in two stages, including a nozzle A coupled to an outer circumferential surface of the body, and a nozzle B having an inner diameter smaller than the inner diameter of the nozzle A and extending from the nozzle A,
Steam characterized in that the second air supply nozzle is formed in two stages, including a C nozzle coupled to the outer circumferential surface of the body, and a D nozzle having an inner diameter smaller than the inner diameter of the C nozzle and extending from the C nozzle. Combustion furnace for boiler.

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