KR20150071741A

KR20150071741A - Combustion system using combustion process of moving gate device

Info

Publication number: KR20150071741A
Application number: KR1020130157759A
Authority: KR
Inventors: 김종진; 최규성; 강새별; 김혁주; 박화춘; 박병식; 임용훈; 심봉석
Original assignee: 한국에너지기술연구원
Priority date: 2013-12-18
Filing date: 2013-12-18
Publication date: 2015-06-29

Abstract

The present invention relates to a combustion system using a combustion type of mobile grate and mobile grate. A multi-stage mobile grate for moving and burning a solid fuel associated with an embodiment of the present invention; And a grate replacement part connected to the end of the multi-stage movable grate and receiving the mobile burned solid fuel and inclined at a predetermined angle, wherein the solid fuel delivered to the grate replacement part includes a time Wherein the multi-stage movable grate is moved by using a tilt of the grate replacement part and a jumping phenomenon induced by the weight of the delivered solid fuel, the at least one pair of fixed ends being fixedly installed through the support member; At least a pair of movable ends provided between the pair of fixed ends; A plurality of propelling shafts connected to the moving end; And driving means for driving the propeller shaft to reciprocate to reciprocate the moving stage to move and burn the solid fuel.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a combustion system using a moving grate,

The present invention relates to a combustion system using a combustion type of mobile grate. More specifically, since the bottom of the moving grate is mainly a zone where charcoal and ash are combusted, the zone is treated with a refractory brick or a steel box or the like to completely burn the char while maintaining the combustion space.

In recent years, the use of fossil fuels has increased rapidly in the modern society, but the development of alternative fuels has been pointed out as an urgent task at the national level and the need for research in this field is highly appreciated.

Wood pellets made from sawdust made from sawdust that are used to process wood and to remove remaining byproducts or forests can be used as an effective alternative to the possibility of designating a target country for carbon emissions reduction after 2013 .

Wood-based pellets have higher density than other wood-based systems, which makes them easy to transport and store, and is suitable for household use because of low dust generation.

Currently, about 3,000 household pellet boilers are supplied in Korea.

However, the performance and functional aspects of the product are so poorly supplied that actual users are feeling inconvenience.

Especially, unstable combustion condition and unstable boiler operating condition, low efficiency boiler is spread and fuel cost is not saved, and it is difficult to supply water at a necessary temperature for the actual use time.

In order to secure these problems, accurate analysis of wood pellet combustion and consequent experimental results are needed as a result.

Based on the combustion characteristics of the wood pellets and the optimized burning condition according to the reaction characteristics and the amount of air through the temperature, it is possible to reduce the initial ignition time of the pellet boiler or to design the combustor which can reach the heating temperature quickly, And a method of manufacturing and operating the system is required.

Accordingly, there is a demand for a mobile grate capable of increasing the efficiency of the boiler and the combustion efficiency, and a solid fuel boiler having the movable grate, which can be operated in a smaller size reflecting the reduced volume as the combustion proceeds.

Korea Patent No. 1062471

SUMMARY OF THE INVENTION The present invention provides a combustion system using a mobile grate combustion method. Specifically, since the lower part of the moving grate is mainly a zone where charcoal and ash are combusted, the section is treated with a refractory brick or a steel box to provide a user with a system capable of completely burning the char while keeping the combustion space intact .

It is to be understood that both the foregoing general description and the following detailed description of the present invention are exemplary and explanatory and are not intended to limit the invention to the precise form disclosed. It can be understood.

A multi-stage movable grate for moving and burning a solid fuel associated with an embodiment of the present invention for realizing the above-mentioned problems; And a grate replacement part connected to the end of the multi-stage movable grate and receiving the mobile burned solid fuel and inclined at a predetermined angle, wherein the solid fuel delivered to the grate replacement part includes a time Wherein the multi-stage movable grate is moved by using a tilt of the grate replacement part and a jumping phenomenon induced by the weight of the delivered solid fuel, the at least one pair of fixed ends being fixedly installed through the support member; At least a pair of movable ends provided between the pair of fixed ends; A plurality of propelling shafts connected to the moving end; And driving means for driving the propeller shaft to reciprocate to reciprocate the moving stage to move and burn the solid fuel.

The grate replacement portion may further include a plurality of air supply holes for supplying the air obtained from the fan to the solid fuel transferred to the grate replacement portion can do.

In addition, the solid fuel may be wood pellets, and the solid fuel transferred to the grate replacement part may be in a charcoal mode state.

Each of the multi-stage movable grate is provided with a plurality of rails provided on a lower side of the moving end, the height of which decreases toward the moving direction of the solid fuel. And a wheel provided between the propelling shaft and the rail, wherein the driving means can move each of the propelling shafts.

In addition, the multi-stage movable grate may be a three-stage movable grate or a five-stage movable grate.

According to another aspect of the present invention, there is provided a method of combustion using a mobile grate combustion method, the method comprising: moving and burning a solid fuel using a multi-stage movable grate; A grate replacement part tilted at a predetermined angle receives the mobile burned solid fuel; And a step of moving the solid fuel transferred to the grate replacement unit using a slope induced by the weight of the delivered solid fuel and a slope of the grate replacement unit that is increased with time, Each comprising at least a pair of fixed ends fixedly installed through a support member; At least a pair of movable ends provided between the pair of fixed ends; A plurality of propelling shafts connected to the moving end; And driving means for driving the propeller shaft to reciprocate to reciprocate the moving stage to move and burn the solid fuel.

In addition, the method includes the steps of: receiving air from a fan; And a step in which the air obtained from the fan is supplied to the solid fuel transferred to the grate replacement portion using a plurality of air supply holes of the grate replacement portion.

The present invention can provide a combustion system using a combustion type of mobile grate. Specifically, since the lower part of the moving grate is mainly a zone where charcoal and ash are combusted, the zone can be treated with a refractory brick or a steel box to provide the user with a system capable of completely burning the coal while maintaining the combustion space have.

It should be understood, however, that the effects obtained by the present invention are not limited to the above-mentioned effects, and other effects not mentioned may be clearly understood by those skilled in the art to which the present invention belongs It will be possible.

BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate preferred embodiments of the invention and, together with the description, serve to further the understanding of the technical idea of the invention, It should not be construed as limited.
1 is a schematic view of a combustion device for supplying a high-temperature gas to a high-temperature atmosphere similar to the actual combustion environment of wood pellets.
Figure 2 compares domestic pellets with Chilean pellets.
Fig. 3 shows the combustion mode of the pellet divided into three modes.
FIG. 4 is a result of comparing the time taken in each mode among the modes described in FIG.
FIG. 5 is a graph showing mass change ratios with time.
FIG. 6 is a graph illustrating a result of comparing the time taken for each of the modes shown in FIG. 3 according to the temperature.
Figure 7 shows a partial cross-sectional view of a boiler for solid fuel with a conventional movable grate.
Fig. 8 shows a specific example of a cross-sectional view of a movable grate having movable and fixed ends according to the present invention.
9 is a view showing an example of a system in which the lower end of the moving grate according to the present invention is treated with refractory bricks or iron boxes to completely burn char while maintaining the combustion space.
FIG. 10 is a top view of a combustion system according to the present invention, which is illustrated in FIG.

Hereinafter, a preferred embodiment of the present invention will be described with reference to the drawings. In addition, the embodiment described below does not unduly limit the content of the present invention described in the claims, and the entire structure described in this embodiment is not necessarily essential as the solution means of the present invention.

Prior to the detailed description of the present invention, the results of investigating changes in the shape of the flame, the combustion characteristics, and the mass through the combustion experiments of the wood pellets applied to the present invention will be described in detail.

First, an experimental apparatus applied to the combustion test of wood pellets will be described with reference to Fig.

1 is a schematic view of a combustion device for supplying a high-temperature gas to a high-temperature atmosphere similar to the actual combustion environment of wood pellets.

Referring to FIG. 1, an LNG burner is positioned on the upper portion and a needle valve is used to finely adjust the fuel.

Also, the air amount is divided into primary and secondary, the primary air is mixed with the fuel in the burner to set the equivalence ratio, the secondary air blocks the heat of the combustion chamber along the outer wall of the combustion chamber to the outside, And the secondary air is supplied.

At this time, a quartz tube was installed under the combustion chamber to visually observe the combustion state of the pellet. The quartz tube was made 90 mm below the combustor with an inner diameter of 50 mm and a height of 100 mm.

Since the exhaust gas passing through the combustion chamber is at a high temperature, the exhaust gas from the combustion chamber and the air

It is designed to cool the temperature by sucking and to discharge it to the outside.

The temperature of the combustion chamber was measured with a thermocouple (K-type) and collected through a data logger (Midi logger, GL800).

Also, since the exhaust gas is difficult to withstand as a general probe at a high temperature of about 1000 ° C., a coolant jacket is installed on the outer wall of the probe, water is circulated and the temperature of the exhaust gas is lowered and then measured using a measurement system (Greenline MK2).

The combustion process of the pellets was photographed with a video camera (SONY, HDR-CX550) through a quartz tube, and the flame combustion state and burning time were analyzed.

Next, a method of performing experiments using the experimental apparatus described with reference to FIG. 1 will be described in detail.

The pellets used in the experiment were domestic pellets and pellets imported from Chile.

Figure 2 compares domestic pellets with Chilean pellets.

Referring to FIG. 2, the highest calorific value of domestic pellets is 4,550 kcal / h, and the water content is 8.28%.

The ash content is relatively high at 0.9%.

On the other hand, as a result of composition analysis for Chilean mountains, the highest calorific value is 4,450 kcal / h, the water content is 7.72%, and the ash content is 0.55%.

In addition, weights were measured accurately using a 0.0001 g scale (Precisa, XT-220A) for use with a constant weight for laboratory wood pellets.

In order to fix the pellet in the center of the quartz tube, a hole was drilled in the lower part of the pellet with a small drill and fixed with a thin pin and fixed to minimize the heat transfer effect by the fixed pin.

The results obtained using the above-described experimental apparatus and experimental method will be described below.

First, the shape of the flame is explained.

The pellet placed on the combustion device is heated by the hot air and ignited, and the fire is turned off, and the pellet proceeds in the form of charcoal and then turns into a complete ash.

Fig. 3 shows the combustion mode of the pellet divided into three modes.

MODE 1 in FIG. 3 is a gasification mode in which the pellets are put into the gasification mode, and the surface is blacked, red, and ignited.

MODE 2 is a period until ignition of gasified fuels in flame burning mode and is extinguished. In MODE 2, when the temperature of high temperature air to be ignited is low, flame is not generated, and in gasification mode It becomes charcoal.

Also, MODE 3 is a charcoal burning mode, in which the fire is completely turned off and the burning charcoal is burned, until it is completely reclaimed.

Next, the combustion time according to the pellet shape will be described.

In general, pellets in solid form are injected into a combustor and fall into various forms to burn.

At this time, the difference in the combustion between the horizontal (pellet lying shape) and vertical (pellet standing shape), which is a typical shape, was shown in order to examine what kind of shape is injected and which receives high temperature heat and combustion.

The temperature of the combustion chamber was measured at 500 ° C, 600 ° C, 700 ° C and 800 ° C, and domestic pellets were used.

FIG. 4 is a result of comparing the time taken in each mode among the modes described in FIG.

The two shapes in MODE 1 did not show a large difference at high temperature. This is because the effect of temperature is greater than the difference in shape. However, at 500 ° C, there is a slight difference in that the transverse pellet is ignited 12 seconds earlier.

In MODE 2, once you start to fire, you can see that there is a flame for a similar time regardless of shape.

When fire is extinguished and enters MODE 3, there is a big difference depending on the shape.

The difference in MODE 1 and 2 is less than 20 seconds, which does not give a big difference in the total combustion time, but in MODE 3, it is largely a difference of about 1 minute, which may have a great effect on the entire combustion time depending on the type.

In addition, when the vertical pellets are present in a state in which the pellets are laid in a wide space, the pellets are woven in a state where the vertical pellets are woven together. In the case where the vertical pellets are present, .

In the following, the mass reduction rate will be described in detail.

The pellets were placed in a combustion device and burned by hot air to show a decrease in mass.

Fig. 5 shows pellets of the same size and weight. The shape of the ellipse shows a mass change of 620 캜, and the shape of the ◇ shows a mass change of 720 캜.

Here, the process of injecting and burning the pellets into the combustion chamber does not decrease the mass in proportion to time, and the rate of decrease of the mass changes when the state changes, that is, when MODE is changed.

First, MODE 1 at 620 ° C reduced the mass by 15.4% for 60 seconds.

Also, as the pellets were heated, the gaseous components present in the pellets were discharged, and the decrease in mass was not so great.

Also, in the section of MODE 2, a sudden mass decrease was observed.

In other words, the actual flame was present and was actively burned, indicating that the mass of 68.5% was drastically reduced in 75 seconds.

Also, in MODE 1 and MODE 2, the mass is reduced by 83.9%, and in MODE 3, only about 15% of char is burned slowly for 5 minutes. Compared to 620 ℃, the change of MODE is faster at 720 ℃.

Also, in MODE 1 of two temperatures, the mass is about 10% different.

This is because the pellets are gasified and the fire is fast at high temperatures,

The start time of MODE 2 is determined and gradually changes to as much as the remaining mass in MODE 3 where the fire is completely extinguished.

The combustion time according to the oxygen concentration will be described below.

The pellet boiler heats air in the atmosphere and blows hot air to ignite. In order to satisfy this condition, this experimental system mixes pure oxygen to adjust the oxygen concentration of the air to 21%, which is equal to the atmospheric oxygen concentration.

However, the concentration of oxygen during burning in the boiler is reduced.

In order to realize such an environment, the combustion state when the oxygen concentration of the combustion apparatus is controlled is compared.

FIG. 6 shows that oxygen added at 10% oxygen concentration at 800 ° C is 21% oxygen added by adding more pure oxygen, "w / o oxygen" is fixed at 10% at 800 ° C, The temperature of 700 ℃ was 14%, the temperature of 600 ℃ was 15% and the temperature of 500 ℃ was 16%.

In MODE 1, the time increases when the oxygen concentration is low as a whole.

In addition, it can be seen that the "w / o Oxygen" at a low temperature of 500 ° C. becomes MODE 3 immediately without the MODE 2 at the same time as the time of MODE 1 increases. Contrary to the high oxygen concentration at 500 ° C.

Also, in MODE 1, it is effective to move to MODE 2 quickly. This is because the delay time that is ignited can be shortened.

In this respect, the time of MODE 1 is longer at temperatures lower than 700 ° C, but the time reduced at 700 ° C is not significantly reduced at temperatures above that.

If you look at MODE 2, you can see that the time of MODE 2, which is the section where the flame exists even after increasing the temperature after 700 ℃, does not increase.

This means that during the combustion in the combustion chamber, the ambient temperature inside it can be most effective when it is between 600 ° C and 700 ° C, which means that there is no significant difference when the temperature rises above that.

In this experiment, MODE 1 and 2 were not significantly related to oxygen concentration.

However, in MODE 3, the time to change from charcoal to ash due to differences in oxygen concentration showed a contrast.

The difference in oxygen concentration between 500 ° C and 60 ° C was not significant. However, at 850 ° C where oxygen concentration was large, the difference was about 4 minutes and 30 seconds.

In other words, when air is injected, injecting air into the char is effective for burning the char.

The following conclusions can be drawn from the results of investigation of the flame shape, combustion characteristics, and mass of the wood pellets.

1. Pellets are divided into three types: gasification, flame burning, and charcoal mode until they are completely burned.

2. Wood pellets fall into various shapes and combustion occurs. However, there was no difference in the time during which the initial ignition or the flame burn occurred regardless of the shape. However, the burning time was shortened when the area receiving air in the form of charcoal after the flame was extinguished.

3. The mass that is reduced when the pellet is burned does not decrease steadily, but the trend is different depending on the shape of the flame. Also, the higher the temperature, the more rapidly the change in mass changes.

4. The higher the initial ignition temperature and the higher the temperature in the combustion chamber, the shorter the burning time.

5. The higher the concentration of oxygen in charcoal, the shorter the burning time. Blowing the air nearest to the atmosphere to charcoal can have a great effect in shortening the burning time.

On the other hand, Korean Patent No. 1062471, Korean Patent Laid-Open No. 2001-84118, Korean Patent Laid-Open Publication No. 1997-62486, etc. disclose a pellet combustion system using a pellet as a heating fuel and a boiler 1 for solid fuel .

7 shows a cross-sectional view of a solid fuel boiler 1 having a conventional movable grate.

7, the solid fuel boiler 1 includes a combustion chamber 10 having a space in which solid fuel is burnt therein, a fuel supply portion (not shown) for supplying solid fuel stored in the fuel storage portion into the combustion chamber 2), a movable grate 20 provided in the combustion chamber 10 for moving the solid fuel supplied upwardly in a staircase structure stepwise from the inlet side to the outlet side, a solid fuel 20 placed on the movable grate 20 An air supply means 40 for supplying combustion air for combustion, and the like.

In addition, the structure of the movable grate 20 includes a plurality of movable stages 21, a movable stage assembly reciprocally driven by a driving device, and a plurality of fixed stages 22 provided between the movable stages. Assembly.

8 shows a specific example of a cross-sectional view of a movable grate associated with the present invention.

8, the movable grate 20 includes a plurality of fixed ends 21 fixedly installed at the lower ends thereof via the support members 23, a plurality of fixed portions 21 provided between the fixed ends 21 and the fixed ends 21, A propelling shaft 30 connected to the moving end 22 and driving means for reciprocating the propelling shaft 30 to reciprocate the moving end 22 to transfer the solid fuel 3 stepwise A plurality of rails 31 whose height gradually decreases toward the direction of movement of the solid fuel 4 and wheels 32 provided between the propeller shaft 30 and the rails 31.

It should be noted that the components shown in Fig. 8 are not essential, and movable gates can be implemented using additional components or some of the configurations shown in Fig.

The movable grate 20 is converted into the fuel 4 gradually as the solid fuel 4 is burned step by step on the movable grate 20 as shown in Fig. do. In Fig. 8, pellets were used as the solid fuel 3.

In the conventional solid fuel boiler 1, as shown in FIGS. 7 and 8, the entire region is made of a moving grate.

That is, the combustion space of the wood pellets is required to be large in accordance with the characteristics of the combustion, and the whole is produced as a moving grate.

However, if the entire area is manufactured as a moving grate, the production cost becomes very high.

Therefore, in order to minimize such a problem, in the present invention, the bottom of the moving grate is mainly a zone where charcoal and ash are combusted, so that the zone is treated with a refractory brick or a steel box or the like to completely combust the charcoal while maintaining the combustion space .

9 is a view showing an example of a system in which the lower end of the moving grate according to the present invention is treated with refractory bricks or iron boxes to completely burn char while maintaining the combustion space.

FIG. 10 shows a specific embodiment of the system according to the present invention as shown in FIG. 9, viewed from above.

Hereinafter, for convenience of explanation, the system proposed by the present invention will be referred to as a smart system.

9 and 10, the smart system 1000 proposed by the present invention may include a grate replacement part 100, a multi-stage movable grate 200, and an external air supply fan 300. [

Here, the multi-stage movable grate 200 may be composed of five stages as shown in Figs. 9 and 10.

However, the present invention is not limited thereto, but may be implemented with a configuration including a different number of movable gratings.

In particular, the multi-stage mobile grate 200 according to the present invention may be implemented in three or five stages.

Each movable grate included in the multistage movable grate 200 is provided with a plurality of fixed ends 21 fixed to the lower end through the support member 23 and between the fixed ends 21 and the fixed ends 21 A propelling shaft 30 connected to the moving stage 22 and a driving device for reciprocally driving the propeller shaft 30 to reciprocate the moving stage 22 to gradually transfer the solid fuel 3 Means 50 and a plurality of rails 31 having a smaller height in the direction of movement of the solid fuel 4 and wheels 32 provided between the propeller shaft 30 and the rails 31.

In addition, the external air supply fan 300 provides a function of supplying the air introduced from the outside to the smart system 1000.

The air introduced through the external air supply fan 300 is moved toward the grate replacement part 100 along both sides of the multi-stage movable grate 200.

Meanwhile, the grate replacement part 100 is connected to the end of the multi-stage movable grate 200.

That is, in the case of manufacturing the entire area as a moving grate, a problem arises that the production cost becomes very high. In order to minimize this problem, in the present invention, since the lower end of the moving grate is mainly burned with charcoal and ash, (100), or the like, so that the char combustion chamber can be completely burned while maintaining the combustion space as it is.

The grate replacement portion 100 is composed of a box 101 and an air supply hole 102.

The box 101 may be a refractory brick box or a steel box.

Also, the air supply hole 102 serves to blow out the air introduced through the external air supply fan 300 to the outside.

As described above, the pellet is divided into three types of gasification, flame burning, and charcoal mode until they are completely burned.

At this time, the wood pellets fall into various shapes and combustion occurs, but there is no difference in the time during which the initial ignition or the flame combustion occurs regardless of the shape.

However, when the flame was destroyed and the area of the charcoal was larger, the burning time was shortened.

The state of the pellet transferred to the grate replacement part 100 corresponds to the charcoal form of Charcoal mode.

Since the area of the air receiving hole 102 according to the present invention is widened, the burning time of the pellets in the form of charcoal mode charcoal mode can be greatly shortened.

The higher the oxygen concentration of the char, the shorter the burning time, and blowing the air nearest to the atmosphere to the char is effective for shortening the burning time. Therefore, the oxygen introduced through the air supply hole 102 The burning time of the pellets in the form of charcoal can be greatly shortened.

On the other hand, the state of the pellet transferred to the multi-stage mobile grate 200 can be seen as a step of gasification and flame burning, and may show the properties of solid.

However, since the state of the pellet transferred to the grate replacement part 100 corresponds to the shape of the charcoal in the charcoal mode and the char can be moved even with a very small force, it need not be moved using the multi-stage movable grate 200 .

That is, the pellets transferred to the grate replacement part 100 are not moved like the multi-stage movable grate 200, but moved to the jungle generated by the pellets accumulated in the box 101.

Particularly, since both sides of the grate replacement part 100 are manufactured to have a length corresponding to the distance between the wall and the wall, no void space is generated between the walls and the grate replacement part 100, The pellets in the state of charcoal transferred to the left side can be moved only in the left direction in Figs.

At this time, in order to facilitate the movement, the grate replacement section 100 may have a slope of a predetermined angle.

Accordingly, the pellets transferred to the grate replacement part 100 can be moved in a predetermined direction by using the inclination of the jogging and grate replacement parts 100 generated by the pellets accumulated in the box 101. [

Therefore, the manufacturing cost can be greatly reduced by using only the multi-stage movable grate 200 and the grate substitute 100 for the remainder.

When the structure of the present invention described above is applied, the lower end of the moving grate is mainly a zone where charcoal and ash are combusted. Therefore, this section is treated with a refractory brick or a steel box to completely burn the charcoal while maintaining the combustion space May be provided to the user.

The present invention can also be embodied as computer-readable codes on a computer-readable recording medium. A computer-readable recording medium includes all kinds of recording apparatuses in which data that can be read by a computer system is stored. Examples of the computer-readable recording medium include a ROM, a RAM, a CD-ROM, a magnetic tape, a floppy disk, an optical data storage device, and the like, and may be implemented in the form of a carrier wave (for example, transmission over the Internet) . In addition, the computer-readable recording medium may be distributed over network-connected computer systems so that computer readable codes can be stored and executed in a distributed manner. In addition, functional programs, codes, and code segments for implementing the present invention can be easily inferred by programmers of the technical field to which the present invention belongs.

It should be noted that the above-described apparatus and method are not limited to the configurations and methods of the embodiments described above, but the embodiments may be modified so that all or some of the embodiments are selectively combined .

Claims

A multi-stage movable grate that moves and burns solid fuel; And a grate replacement unit connected to the end of the multi-stage movable grate and receiving the mobile burned solid fuel and inclined at a predetermined angle,
The solid fuel transferred to the grate replacement part is moved using a slope of the grate replacement part and a jumping phenomenon induced by the weight of the transferred solid fuel which is increased with time,
Each of the multi-stage movable grate,
At least a pair of fixed ends fixedly installed through the support member;
At least a pair of movable ends provided between the pair of fixed ends;
A plurality of propelling shafts connected to the moving end; And
And drive means for driving the propeller shaft to reciprocate to reciprocate the movable stage to move and burn the solid fuel.

The method according to claim 1,
And a fan for supplying air from the outside,
Wherein the grate replacement portion further comprises a plurality of air supply holes for supplying the air obtained from the fan to the solid fuel transferred to the grate replacement portion.

The method according to claim 1,
The solid fuel is a wood pellet,
And the solid fuel transferred to the grate replacement portion is in a charcoal mode state.

The method according to claim 1,
Each of the multi-stage movable grate,
A plurality of rails provided on a lower side of the moving end, the rails being smaller in height in a moving direction of the solid fuel; And
And a wheel provided between the propeller and the rail,
And the drive means moves each of the propeller shafts.

The method according to claim 1,
Wherein the multi-stage mobile grate is a three-stage mobile grate or a five-stage mobile grate.

A boiler for solid fuel comprising a combustion system according to any one of claims 1 to 5.

In a combustion method using a combustion method of a mobile grate,
A step of moving and burning the solid fuel using a multi-stage movable grate;
A grate replacement part tilted at a predetermined angle receives the mobile burned solid fuel; And
The solid fuel transferred to the grate replacement part is moved by using a jumping phenomenon induced by the weight of the delivered solid fuel increased with time and a slope of the grate replacement part,
Each of the multi-stage movable grate,
At least a pair of fixed ends fixedly installed through the support member;
At least a pair of movable ends provided between the pair of fixed ends;
A plurality of propelling shafts connected to the moving end; And
And drive means for reciprocating the propelling shaft to reciprocate the moving end to move and burn the solid fuel.

8. The method of claim 7,
A step in which a fan receives air from outside; And
And using the plurality of air supply holes of the grate replacement section to supply the air obtained from the fan to the solid fuel transferred to the grate replacement section.

8. The method of claim 7,
The solid fuel is a wood pellet,
And the solid fuel transferred to the grate replacement part is in a charcoal mode state.

8. The method of claim 7,
Wherein the multi-stage mobile grate is a three-stage mobile grate or a five-stage mobile grate.

A boiler for solid fuel using the combustion method according to any one of claims 7 to 10.