KR20200092766A - Furnace for steam boiler - Google Patents

Abstract

An objective of the present invention is to provide a combustion furnace for a steam boiler, which does not need to be cleaned. According to the present invention, the combustion furnace for a steam boiler comprises: a combustion chamber having a feeding part into which fuel is fed, and a heating means which is installed therein and combusts the fed fuel; a base housing arranged on a lower portion of the combustion chamber and provided with an internal accommodation space, wherein an upper portion thereof is opened; a fire grate unit formed in a caterpillar type, installed in the base housing to perform a continuous circulation motion from an upper side to a lower side, and provided with a plurality of outlets formed to allow ash created after the fuel fed into the combustion chamber is seated on an upper side thereof to be combusted and then to fall downwards; an ash collection means installed in the base housing and arranged underneath the upper side in the fire grate unit to collect the ash falling after the fuel is combusted in the upper side of the fire grate unit; and an ash discharge unit installed in the base housing and arranged on a lower portion of the ash collection means to discharge the ash collected by the ash collection means out of the base housing. The fire grate unit includes: a transport conveyor formed in a caterpillar type and provided with a plurality of fastening parts formed on both ends thereof in the width direction at regular intervals in the longitudinal direction; and unit fire grates arranged in the width direction of the transport conveyor, wherein both ends thereof are detachably coupled to the fastening parts.

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 orbit type fire grate unit.

Boilers may be classified into heating boilers that supply heating water or hot water, and steam boilers that produce steam used as a power source or hot air for processing, depending on the purpose.

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

Steam boilers have a different structure of the combustion furnace depending on the type of fuel, but basically, a bundle of piping with a complicated structure is provided inside the chamber so that heat generated from the combustion furnace is effectively transferred to the water. This is put in alternately.

Bunker seed oil or gas has been mainly used as a fuel for steam boilers, but recently, the use of fossil fuels has been avoided due to rising oil prices and global warming, and wood pellets, wood chips, and WCF are inexpensive as alternative fuels. Wood fuel is getting attention.

The steam boiler for wood fuel is composed of a fuel processing unit in which wood fuel is placed, a combustion unit provided on an upper portion of the fuel processing unit, and a steam generating unit.

The fuel processing unit and the combustion unit are provided with a grate and a vertical water pipe, respectively, and water preheated while passing through the grate and the vertical water pipe is collected in a steam generating unit, and generated in a combustion unit due to an association provided inside the steam generating unit. The supplied combustion gas is supplied to generate steam from water collected by the heat of the combustion gas.

The grate of the steam boiler according to the prior art is provided with an air hole for combustion of a water pipe through which water to be preheated flows and wood fuel placed on the upper part. Combustion is actively performed only on the wood fuel around the air hole, and the air Since a part of ash enters the air supply room provided at the lower part through the hole, there is a problem in that the thermal efficiency is lowered due to a poor air supply.

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

In addition, the grate of the steam boiler according to the prior art has a problem in that it takes a lot of time and money to replace, since the entire grate must be replaced when a part of the grate is deformed by the high temperature heat generated while the fuel is burning.

KR 10-1535772 B1 (2015.07.24.announcement)

The present invention has been devised to solve a number of conventional problems as described above, there is no need to clean and the orbital moving grate unit (fire) that can replace only the portion deformed by the high temperature heat generated while burning the fuel The purpose is to provide a combustion furnace for a steam boiler employing a grate unit.

In order to achieve the above objects, the combustion furnace for a steam boiler according to the present invention, a fuel injection unit is formed, the combustion chamber is installed inside the heating means for burning the fuel; A base housing disposed at the lower portion of the combustion chamber, an inner receiving space formed, and an upper portion opened; It is composed of a caterpillar type, and is installed inside the base housing to continuously circulate from top to bottom, and a plurality of fuels placed in the combustion chamber are placed in the upper portion and burned so that ash generated after falling is dropped downward. Grate unit in which the discharge hole of the is formed; An ash collection means installed inside the base housing and disposed below the upper portion of the grate unit to collect ash falling after fuel is burned at the upper portion of the grate unit; And a re-discharge unit disposed inside the base housing and disposed under the ash collection means to discharge ash collected by the ash collection means to the outside of the base housing. Conveying conveyor is formed of a plurality of fasteners at regular intervals along the longitudinal direction on both ends of the width direction; And a unit grate disposed in the width direction of the transport conveyor and having both ends detachably coupled to the fastening unit.

At this time, the unit grate, the frame portion of the frame type having a predetermined length; A plurality of grate rods which are arranged in the width direction along the length direction of the frame portion and are combined but twisted obliquely in one direction; And a coupling portion extending from both ends of the frame portion in the longitudinal direction and fastened to the fastening portion, wherein the grate rods adjacent to each other in the plurality of grate rods are inclined and twisted in opposite directions to each other. To form a plurality of discharge holes.

In addition, the re-collection means, it is preferable that the upper and lower hopper is formed in the form of a hopper of the upper and lower opening.

In addition, the ash discharging unit is preferably made of a discharging conveyor that is disposed at a right angle to the conveying conveyor and the ash collected from the ash collecting means is stacked and discharged to the outside of the base housing.

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

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

In addition, the present invention has the effect that the grate unit is made to fasten a plurality of unit grate to the track-type conveying conveyor on which the fastening part is formed, so that only the unit grate part deformed by the heat generated by the combustion of fuel can be replaced. Accordingly, it is possible to reduce the cost and has convenient advantages for maintenance.

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, by providing 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, it is possible to smoothly supply air over the entire upper area of the grate unit. It has an effect.

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

In addition, the present invention has an effect of increasing convenience by automatically discharging ash generated after being burned in the grate unit to the outside of the base housing by providing the ash collection means and the ash discharge unit inside the base housing.

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

Hereinafter, preferred embodiments of the combustion furnace for a steam boiler according to the present invention will be described in detail with reference to the accompanying drawings. For reference, the terms and words used in the present specification and claims should not be construed as being limited to ordinary or lexical meanings, and the inventor appropriately uses the concept of terms to explain his or her invention in the best way. Based on the principle that it can be defined, it should be interpreted as meanings and concepts consistent with the technical spirit of the present invention. In addition, the configuration shown in the embodiments and drawings described in this specification is only one of the most preferred embodiments of the present invention, and does not represent all of the technical spirit of the present invention, and thus can replace them at the time of application. It should be understood that there may be equivalents and variations.

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 an internal structure of a steam boiler for FIG. 1 when viewed from the side.

The combustion furnace for a steam boiler according to the present invention comprises 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 top of the base housing 20 to be described later.

As a fuel, wood pellets are mainly used, and these wood pellets are fuels that are compressed into a cylindrical shape after crushing sawdust such as forestry waste or pine felling.

It has a length of 3.0cm and a thickness of 0.6~0.8cm, and generates more heat than ordinary wood used for simple firewood, and its combustion rate reaches 95%, so it hardly leaves any debris.

Even a few ashes can be used as fertilizer in gardens and pots.

Carbon emissions are only one-twelfth that of ordinary diesel, making it an emerging fuel for eco-friendly fuels.

As such, wood pallets have attracted attention as the most economical clean fuel, and various attempts have been made to distort the authenticity, but most of them were not certified tests such as testing in non-standard facilities.

Currently, wooden pallets are under strict quality control by the Forest Service and related agencies, and it is found that various suspicions are not true according to relevant laws and scientific tests of the Ministry of Environment.

On the other hand, a heating means (not shown) for burning the injected fuel is installed inside the combustion chamber 10, 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 on the upper portion U.

The base housing 20 is disposed at the lower portion of the combustion chamber 10, an internal receiving space is formed, and an upper portion is formed in an open shape, so that the grate unit 30 to be described later, the re-collection means 50 and the re-emission The unit 60 and the like are installed.

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

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

Ash collection means 50 is installed inside the base housing 20, but is disposed below the upper part of the grate unit 30, and the ash falling after fuel is burned in the upper part U of the grate unit 30 For collection, the upper and lower openings may be formed in the form of a hopper 52 of the upper and lower ganglia.

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

At this time, in order to collect ash discharged to the outside of the base housing 20 by the ash discharge unit 60, a re-receiving box (not shown) may be provided on one side of the base housing 20.

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, FIG. 5 is a view showing a grate rod in the unit grate of FIG. 4.

The grate unit 30 is made of a track type, but is arranged in the width direction of the transport conveyor 32 and the transport conveyor 32 in which a plurality of fastening parts 32a are formed at regular intervals along the length direction at both ends of the width direction. However, it comprises a unit grate 34 to which both ends are detachably coupled to the fastening portion 32a.

As such, the grate unit 30 is made to fasten a plurality of unit grate 34 to the track type transport 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 burning ( 34) Only parts can be replaced. Accordingly, it is possible to reduce costs and has convenient advantages for maintenance.

The unit grate 34 includes: a frame portion 34a having a predetermined length; A plurality of grate rods 34b, which are arranged in the width direction along the longitudinal direction of the frame portion 34a and are coupled but twisted obliquely in one direction; And a coupling portion 34c extending from both ends in the longitudinal direction of the frame portion 34a and fastened to the fastening portion 32a formed in the transfer conveyor 32.

The grate rods 34b adjacent to each other in the plurality of grate rods 34b are formed in a twisted shape inclined in opposite directions to form a plurality of discharge holes H between the adjacent grate rods 34b.

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

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

Combustion furnace for a steam boiler according to the present invention is installed inside the base housing 20, but is arranged below the upper part U in the grate unit 30, a plurality of discharge holes H (adjacent grate rods 34b ) May further include an air supply unit 40 for supplying air to the fuel placed in the grate unit 30 through an exhaust hole formed between ).

Thus, 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 and at the same time heating the grate unit 30 of 1500 ℃ or more By cooling the upper portion (U) by air cooling, it is possible to lower the temperature of the lower portion (L) of the grate unit 30 located below the air supply unit 40 to 30°C or less.

The air supply unit 40 includes a pair of fixed frames 42, which are fixed to both inner upper sides of the base housing 20, respectively; And an air supply nozzle assembly provided in plural and spaced apart from each other along the longitudinal direction of the fixed frame 42 in a direction perpendicular to the fixed frame 42, wherein both ends are respectively fixed to the pair of fixed frames 42 ( 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 a hollow pipe shape 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), is provided in a plurality is disposed at a predetermined interval along the longitudinal direction of the body (44a).

The second air supply nozzle (N2) is projected on the outer circumferential surface of the body (44a) so that the angle of incidence (angle formed along the outer circumference of the body (44a)) with the first air supply nozzle (N1) is 60° to 80°. Combined, it is 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 arranged along the longitudinal 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 the state viewed from the front in 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) are made of the same form, the first air supply nozzle (N1) is A nozzle (A) coupled to the outer peripheral surface of the body (44a), and the inner diameter It is formed smaller than the inner diameter of the A nozzle (A) and is formed in two stages including the B nozzle (B) extending from the A nozzle (A).

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

Thus, by forming the first air supply nozzle (N1) and the second air supply nozzle (N2) in a two-stage form having a smaller inner diameter, when air is supplied to the grate unit 30, the air flow rate is increased to make the air flow more smoothly. It will be able to supply air.

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

Meanwhile, in the grate unit 30, the plurality of first air supply nozzles N1 located in the part corresponding to the part where ignition starts and the plurality of second air supply nozzles N2 are located in the body 44a. It can be arranged densely along the longitudinal direction.

Accordingly, it is possible to supply more air to the portion where ignition starts, so that combustion can be smoothly and efficiently performed.

The present invention described above is not limited by the above-described embodiments and accompanying drawings, and various substitutions, modifications, and changes are possible within the scope of the present invention without departing from the technical spirit of the present invention. It will be obvious to those with ordinary knowledge.

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 discharge unit
62: discharge conveyor

Claims (4)

A combustion chamber in which a fuel injection part is formed, and a heating means for burning the fuel is installed therein;
A base housing disposed at the lower portion of the combustion chamber, an inner receiving space formed, and an upper portion opened;
It is composed of a caterpillar type and is installed inside the base housing to continuously circulate from top to bottom. Grate unit in which the discharge hole of the is formed;
An ash collection means installed inside the base housing and disposed below the upper portion of the grate unit to collect ash falling after fuel is burned at the upper portion of the grate unit; And
Included in the interior of the base housing, the ash discharging unit is disposed under the ash collection means to discharge the ash collected by the ash collection means to the outside of the base housing;
The grate unit,
Conveyor-shaped, but at both ends in the width direction, a transport conveyor in which a plurality of fastening parts are formed at regular intervals along the length direction; And
It is arranged in the width direction of the transport conveyor, the unit grate both ends are detachably coupled to the fastening unit; characterized in that comprises a combustion furnace for a steam boiler.
The method according to claim 1,
The unit grate,
A frame portion in the form of a frame having a predetermined length;
A plurality of grate rods which are arranged in the width direction along the length direction of the frame portion and are coupled but twisted obliquely in one direction; And
It is made, including; a coupling portion that extends from both ends of the frame portion in the longitudinal direction and is coupled to the fastening portion,
The grate rods adjacent to each other in the plurality of grate rods are formed in a twisted shape inclined in opposite directions to each other, thereby forming a plurality of discharge holes between the adjacent grate rods.
The method according to claim 1,
The ash collection means,
Combustion furnace for a steam boiler, characterized in that the upper and lower openings are made in the form of hoppers in the upper and lower straits.
The method according to claim 1,
The re-discharge unit,
A combustion furnace for a steam boiler, characterized in that it comprises a discharge conveyor arranged in a direction perpendicular to the transport conveyor and the ash collected from the ash collection means is stacked and discharged to the outside of the base housing.

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