KR20150071742A - Combustion system using moving gate device combined with chain stoker - Google Patents

Abstract

The present invention relates to a combustion system which is combined with a moving grate and a chain stoker. More specifically, to a combustion system which secondarily combusts fuel in a chain stoker which was primarily combusted in a moving grate. According to an embodiment of the present invention, in a combustion system which contains a multistage moving grate to primarily move solid fuel and a chain stoker which is connected to an end of the multistage moving grate to secondarily move the solid fuel received from the multistage moving grate, each multistage moving grate comprises: at least one pair of fixating ends which are fixatedly installed using supporting members; a pair of moving ends which are arranged between the one pair of fixating ends; and a driving unit to primarily move the solid fuel through a reciprocal movement of the moving ends by reciprocating a number of propelling shafts which are connected to the moving ends and the propelling shafts, wherein the chain stocker contains a number of driving wheels which are installed by being mutually separated and a chain part which rotates by using a plurality of driving wheels and secondarily moves the solid fuel transferred from the multistage moving grate through the rotation. The speed of the primary movement is faster than the speed of the secondary movement, and the speed of the secondary movement may be uniform.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a combustion system combining a movable grate and a chain stocker,

The present invention relates to a combustion system combining a mobile grate and a chain stocker. More particularly, to a combustion system in which a primary burned fuel is secondarily combusted in a chain stoker in a mobile grate.

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.

Therefore, it is required to use a portable grate and a chain stoker together to make the apparatus more compact and operate at a lower air ratio, thereby improving the efficiency and combustion efficiency of the boiler.

Korea Patent Publication No. 2001-84118

SUMMARY OF THE INVENTION The present invention provides a combustion system in which a mobile grate and a chain stoker are combined. Specifically, the present invention is intended to provide a user with a combustion system for secondary combustion of primary burned fuel in a chain stoker in a mobile grate.

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 a solid fuel associated with an embodiment of the present invention for realizing the above-mentioned problems; And a chain stocker connected to a distal end of the multi-stage movable grate to move a solid fuel transferred from the multi-stage movable grate to a second position, wherein each of the multi-stage movable grate includes at least A pair of fixed ends; 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 drive means for reciprocating the propelling shaft to reciprocate the moving stage to move the solid fuel first, wherein the chain stoker comprises: a plurality of drive wheels spaced apart from each other; And a chain portion rotating using the plurality of driving wheels and performing a second movement of the solid fuel transferred from the multi-stage movable grate through the rotation, wherein the speed of the first movement is a speed of the second movement And the speed of the second movement may be constant.

The solid fuel is at least one of a gasification mode and a flame burning mode, and the second moving solid fuel is at least one of char combustion And may be a charcoal mode state.

In addition, the speed of the first movement may be slowed down to a predetermined ratio corresponding to the distance between the multi-stage movable grate and the chain stalker.

The ratio of the first movement speed to the second movement speed is 5: 1, and the ratio of the first movement length of the multi-stage movable grate to the second movement length of the chain stocker is 5: 5 or 6: 4 < / RTI >

The chain stoker further includes a plurality of air supply holes for supplying the air obtained from the fan to the solid fuel delivered to the chain stocker can do.

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.

In addition, a solid fuel boiler including the combustion system described above can be provided.

According to another aspect of the present invention, there is provided a combustion method comprising: a first movement of a solid fuel using a multi-stage movable grate; And a second movement of the solid fuel transferred from the multi-stage movable grate using a chain stocker connected to the end of the multi-stage movable grate, wherein each of the multi-stage movable grate includes at least a pair of fixed A fixed end of; 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 drive means for reciprocating the propelling shaft to reciprocate the moving stage to move the solid fuel first, wherein the chain stoker comprises: a plurality of drive wheels spaced apart from each other; And a chain portion rotating using the plurality of driving wheels and performing a second movement of the solid fuel transferred from the multi-stage movable grate through the rotation, wherein the speed of the first movement is a speed of the second movement And the speed of the second movement may be constant.

The solid fuel is at least one of a gasification mode and a flame burning mode, and the second moving solid fuel is at least one of char combustion And may be a charcoal mode state.

In addition, the speed of the first movement may be slowed down to a predetermined ratio corresponding to the distance between the multi-stage movable grate and the chain stalker.

The method may further include: supplying air from the outside using a fan; And supplying air obtained from the fan to the solid fuel delivered to the chain stocker using a plurality of air supply holes included in the chain stocker.

Further, a solid fuel boiler using the above-described combustion method can be provided.

The present invention can provide a combustion system combining a mobile grate and a chain stocker. Specifically, the present invention can provide a user with a combustion system for secondary combustion of primary burned fuel in a chain stoker in a mobile grate.

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.
Fig. 9 shows a specific example of a chain stocker according to the present invention.
FIG. 10 shows a specific example of a combustion system combining a movable grate and a chain stocker according to the present invention.
FIG. 11 is a top view of a combustion system combining the movable grate and the chain stoker according to the present invention shown in FIG. 10.

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.

On the other hand, Fig. 9 shows a concrete example of the chain stalker related to the present invention.

9, the chain stocker 40 includes a frame 41, first and second drive shafts 42a and 43a disposed to be spaced apart from each other, and driving shafts 42a and 43a, A driving part 44 for driving the first driving shaft 42a and a driving part 42 for driving the first and second driving wheels 42 and 42 A driving grate 50 on an endless track and an air blower 60 provided below the driving grate 50 to supply air for combustion of solid fuel.

The driving wheels 42 and 43 may be sprockets. The driving grate 50 may be an endless track that can be driven by a sprocket. The driving wheels 42 and 43 may include a fuel storage unit for storing solid fuel, Link members having air guide portions for guiding air upward are interconnected by hinge shafts.

In addition, unit links are provided at both ends of the hinge shaft at predetermined intervals, and unit links are formed at ends of the unit links, thereby forming a chain on an endless track where the edge of the link member and the unit link are caught by the sprocket.

As another embodiment of the driving grate on the infinite orbit, a pair of chains (not shown) which are engaged with the first and second driving wheels 42 and 42 and the link member are continuously installed along the link of the chain Lt; / RTI >

However, the chain stoker described with reference to Fig. 9 shows only a simple example that can be applied to the present invention, and the content of the present invention is not limited to the chain stalker described in Fig.

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.

Or the conventional solid fuel boiler 1 is made of only the chain stocker described in Fig.

However, as described above, the pellet is changed over time into a gasification mode, a flame burning mode, and a charcoal burning mode.

In this case, it is preferable that the density of the pellets changes with the state change, and the speed of movement of the pellets changes corresponding to the density change.

That is, it is an ideal condition to move quickly in the initial solid fuel (gasification mode) state and to move slowly when it is almost ashes.

The reason for this is that, in the initial solid fuel, in order to achieve the overall combustion by taking into consideration the solid characteristic, it is necessary to carry out a high-speed induced inversion, whereas in the case of the charcoal burning mode fuel, So that the combustion can not be performed due to the high speed.

However, since the chain stoker maintains the same moving speed, there is a problem that it is difficult to efficiently carry out the combustion operation in response to the state change of the pellet when the solid fuel boiler 1 is manufactured using only the chain stoker.

Therefore, in order to minimize such a problem, the present invention proposes a combustion system in which a primary burned fuel is secondarily combusted in a chain stoker in a mobile grate.

That is, in the gasification mode and the flame burning mode, which are the initial states of the solid pellets, the movable grate is applied to move and burn the pellet rapidly, and the charcoal burning mode ), The chain stoker is applied to move at a slow fixed speed, thereby achieving an efficient combustion operation.

FIG. 10 shows a specific example of a combustion system combining a movable grate and a chain stocker according to the present invention.

11 is a top view of a combustion system combining the movable grate and the chain stoker according to the present invention shown in FIG. 10.

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

10 and 11, the smart combustion system 1000 proposed by the present invention includes a chain stoker 100, a driving motor 101, 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. 10 and 11.

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.

Also, the external air supply fan 300 provides a function of supplying the air to the smart combustion system 1000 from the outside.

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

On the other hand, the chain stocker 100 is connected to the end of the multi-stage movable grate 200.

The chain stocker 100 according to the present invention includes a frame 41, first and second drive shafts 42a and 43a provided to be spaced apart from each other in the frame 41, A driving part 44 for driving the first driving shaft 42a and a driving part 42 for driving the first driving shaft 42a and the second driving wheel 42, And a blower 60 installed at a lower portion of the driving grate 50 to supply air for combustion of the solid fuel.

In addition, the driving wheels 42 and 43 according to the present invention may be formed of sprockets, and the driving grate 50 may be an endless track for being driven by a sprocket, And link members having an air guide portion for guiding upwardly the air supplied from below are connected to each other by hinge shafts and are protruded at predetermined intervals on both sides of the hinge shaft and unit links are provided at the end portions of the hinge shafts, And the unit link is engaged on the sprocket.

On the other hand, a drive motor 101 for driving the chain stocker 100 may be separately provided.

That is, as the drive motor 101 different from the drive motor for driving the multi-stage movable grate 200, a drive motor 101 for operating only the chain stocker 100 may be separately provided.

As described above, when the entire area of the solid fuel boiler is made of a moving grate, the production cost becomes very high.

In addition, when the solid fuel boiler is manufactured using only the chain stoker, the chain stoker maintains all the same moving speed, so that there is a problem that it is difficult to efficiently carry out the combustion operation in response to the state change of the pellet.

That is, the pellet is changed into a gasification mode, a flame burning mode, and a charcoal burning mode with time, and the density of the pellets changes with the change of state, It is preferable that the moving speed of the pellet is changed corresponding to the density change.

That is, it is an ideal condition to move quickly in the initial solid fuel (gasification mode) state and to move slowly when it is almost ashes.

The reason for this is that, in the initial solid fuel, in order to achieve the overall combustion by taking into consideration the solid characteristic, it is necessary to carry out a high-speed induced inversion, whereas in the case of the charcoal burning mode fuel, So that the combustion can not be performed due to the high speed.

Therefore, in the present invention, the chain stoker 100 in which the constant velocity is maintained and the multi-stage movable grate 200 capable of varying the velocity are used together.

That is, in the gasification mode and the flame burning mode, which are the initial states of the solid pellets, the movable grate is applied to move and burn the pellet rapidly, and the charcoal burning mode ), The chain stoker is applied and moved at a slow fixed speed, thereby achieving an efficient combustion operation.

On the other hand, the section length between the chain stocker 100 and the multi-stage movable grate 200 may be 5: 5 or 4: 6.

In addition, the moving speed of the pellet in the chain stocker 100 and the multi-stage movable grate 200 may be 0.2: 1. That is, it can have a speed ratio of 1: 5.

On the other hand, as described above, the pellets are 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 chain stocker 100 corresponds to the charcoal form of Charcoal mode.

The chain stocker 100 according to the present invention may include at least a part of a plurality of air supply holes (not shown).

That is, since the area of receiving the air through the air supply hole according to the present invention is widened, the burning time of the pellet 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 atmospheric air to the char is effective for shortening the burning time. Therefore, The burning time of the pellets in the form of a pellet can be greatly shortened.

Here, the oxygen introduced into the air supply hole can be obtained from the external space through the external air supply fan 300.

In the gasification mode and the flame burning mode, which are the initial states of the solid pellet, the movable grate is applied to the solid pellet to move and burn the solid pellet in the second half of the pellet, In the charcoal burning mode, the chain stoker is applied to move at a slow fixed speed, thereby ensuring an efficient combustion operation.

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 (13)

A multi-stage movable grate for first moving the solid fuel; And a chain stoker connected to an end of the multi-stage movable grate to move a solid fuel transferred from the multi-stage movable grate to a second position,
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 movable stage to first move the solid fuel,
In the chain stocker,
A plurality of drive wheels disposed to be spaced apart from each other; And
And a chain portion rotating using the plurality of driving wheels to move the solid fuel transferred from the multi-stage movable grate through the rotation,
Wherein the rate of the first movement is faster than the rate of the second movement,
Wherein the rate of said second movement is constant. The method according to claim 1,
The solid fuel is a wood pellet,
Wherein the first moving solid fuel is at least one of a gasification mode and a flame burning mode,
And the second transferred solid fuel is in a charcoal mode state. The method according to claim 1,
Wherein the speed of the first movement is slowed at a predetermined rate corresponding to the distance between the multi-stage movable grate and the chain stoker. The method according to claim 1,
Wherein the ratio of the rate of the first movement to the rate of the second movement is 5: 1,
Wherein the ratio of the first travel length of the multi-stage movable grate to the second travel length of the chain stocker is 5: 5 or 6: 4. The method according to claim 1,
And a fan for supplying air from the outside,
Wherein the chain stoker further comprises a plurality of air supply holes for supplying the air obtained from the fan to the solid fuel delivered to the chain stocker. 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 7. A first movement of the solid fuel using a multi-stage movable grate; And
Moving the solid fuel transferred from the multi-stage movable grate using a chain stocker connected to the end of the multi-stage movable grate,
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 movable stage to first move the solid fuel,
In the chain stocker,
A plurality of drive wheels disposed to be spaced apart from each other; And
And a chain portion rotating using the plurality of driving wheels to move the solid fuel transferred from the multi-stage movable grate through the rotation,
Wherein the rate of the first movement is faster than the rate of the second movement,
Wherein the rate of said second movement is constant. 10. The method of claim 9,
The solid fuel is a wood pellet,
Wherein the first moving solid fuel is at least one of a gasification mode and a flame burning mode,
And the second transferred solid fuel is in a charcoal mode state. 10. The method of claim 9,
Wherein the rate of the first movement is slowed at a predetermined rate corresponding to the distance between the multi-stage movable grate and the chain stocker. 10. The method of claim 9,
Receiving air from the outside using a fan; And
And supplying air obtained from the fan to the solid fuel delivered to the chain stocker using a plurality of air supply holes included in the chain stocker. A boiler for solid fuel using the combustion method according to any one of claims 9 to 12.

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