KR20180062531A - Burner apparatus solid fuel powder and system and method for boiler using efficient heat exchanger - Google Patents

Abstract

The present invention relates to a boiler comprising a combustion device capable of effectively burning solid fuel powder and a heat exchanger for efficiently exchanging heat, and an operation method thereof, including a combustion chamber in which combustion of solid fuel occurs; a solid fuel feeder including a screw feeder provided on one side of the combustion chamber and having a cylindrical shape and being arranged in parallel to the outer shape and being formed as a pipe and rotatable to transfer the solid fuel through a rotation operation; a fired grate device provided in the combustion chamber and including a fixed grate and a moving grate; and a driving device for moving the moving grate, wherein the solid fuel is injected through the fuel feeder into the injection portion positioned in the upper end portion of the moving grate device as one side and moved to a discharge unit located at a lower end of the moving grate device as the other side by a reciprocating operation of the moving grate to be gradually burned, and the length of at least one of the fixed grate device and the moving grate device is longer than the length of one stroke of the moving grate device by the driving device as a long axis grate and at least one unit of the long axis grate is installed on the moving grate device.

Description

FIELD OF THE INVENTION [0001] The present invention relates to a boiler having a combustion device capable of effectively burning solid fuel powder and a heat exchanger for efficiently exchanging heat, and a method of operating the boiler.

The present invention relates to a boiler comprising a combustion device capable of effectively burning a solid fuel powder and a heat exchanger for efficiently exchanging heat and an operation method thereof. More specifically, in the case of a combustion apparatus for a solid fuel using a conventional movable grate device, the combustion time of the fuel considering the combustion stage of the solid fuel and the combustion time can not be ensured and the combustion gas discharged from the charcoal or ash at the bottom of the mobile grate A boiler comprising a combustion device capable of effectively burning a solid fuel powder capable of solving the problem that a combustion gas containing a large amount of combustible components is discharged without being sufficiently combusted, and a heat exchanger for efficiently exchanging heat, and an operation method thereof will be.

Liquid fuels such as crude oil (crude oil) and gas gases such as petroleum gas and natural gas are fossil fuels that have to be rely on imports, and the world's production-consumption tendency by producers It can not help but be influenced greatly by the flow of The first and second oil crises had a great impact on all industries in the country that had to rely on foreign liquefied fossil fuels. On the other hand, solid fuel using living-industrial wastes, which is now being mass-produced due to musk industrialized coal and industrial development and changes in living environment, is useful in comparison with the production cost, and in terms of recycling of waste, It is attracting attention.

On the other hand, since solid fuels generally have lower hydrocarbon ratios and higher calorific values than liquid and gas fossil fuels, it is necessary to develop various techniques for increasing combustion efficiency.

FIG. 1 shows a cross-sectional view of a conventional solid-fuel fuel cell combustion apparatus with a movable grate device, and FIG. 2 illustrates the reciprocating movement of the movable grate in the conventional solid fuel grate device and thus the movement of the solid fuel.

As shown in FIG. 1, the combustion apparatus for a solid fuel includes a combustion chamber 110 having a space in which a solid fuel is burnt, a fuel feeder 150 for supplying solid fuel into the combustion chamber, A driving device 120 for moving the movable grate, a combustion gas guiding part 113, and a heat exchanger 140 for moving the solid fuel supplied upward through the fuel feeder in a stepwise manner, And the like.

As shown in FIG. 2, the structure of the mobile grate 130 comprises a plurality of fixed grate 131 and a plurality of moving grate 132 installed between the fixed grate. The moving grate is reciprocally driven by the driving device between the fixed grate, so that the solid fuel injected into the inlet portion of the movable grate device in the combustion chamber through the fuel feeder is moved to the outlet portion of the lower portion of the movable grate device due to the reciprocating drive of the moving grate .

1 and 2, in the conventional solid fuel boiler, the length A of the fixed grate, the length B of the moving grate and the moving distance C of the moving grate are the same. Thus, during the passage of the solid fuel through the entire mobile grate device, from the inlet to the outlet, the solid fuel stays at the same time in all the grate.

In order to efficiently burn the solid fuel, various combustion techniques should be applied to the combustion device so as to obtain a complete combustion state in which all of the combustible components such as hydrogen and carbon monoxide are burned in the combustion gas generated in the char condition, do. Unlike the combustion state of the mobile grate where the flame is generated and burned, that is, the combustion state of the solidification fuel in the lower part of the mobile grate near the discharge part, the solid fuel is changed into the char combustion state and burned. Therefore, depending on the position of the movable grate, the combustion stage of the solid fuel, the combustion time and space required in the combustion process are different.

Therefore, in the case of a combustion apparatus for a solid fuel using a conventional mobile grate device, the combustion time and the combustion space of the fuel can not be ensured in consideration of the combustion stage of the solid fuel, and therefore, incompletely burnt charcoal can be generated. Further, there is a problem that the combustion gas containing a large amount of combustible components discharged from charcoal or ash from the bottom of the mobile grate is discharged without being sufficiently combusted.

Korean Patent Publication No. 10-2014-0072229 Korean Patent No. 10-0830291 Korean Patent No. 10-0917928

SUMMARY OF THE INVENTION Accordingly, the present invention has been made keeping in mind the above problems occurring in the prior art, and it is an object of the present invention to provide a combustion apparatus capable of effectively burning solid fuel powder, By changing only the length of the movable grate, the total number of strokes of the solid fuel moving from the input portion to the discharge portion is increased, thereby increasing the time for the solid fuel to remain in the combustion chamber and burn. Which is capable of effectively burning a solid fuel powder capable of being burned.

Further, according to an embodiment of the present invention, by keeping the combustion gas in the combustion chamber for a longer time, it can be maintained at a high temperature inside, and in the process, the combustible gas contained in the combustion gas is continuously burned, The combustion key is intended to provide a combustion device capable of effectively burning a solid fuel powder that can be expected to have an effect.

According to an embodiment of the present invention, a flow of exhaust gas at a high temperature rising up to a central portion of the heat exchanger is induced, and the exhaust gas can uniformly contact with the heat medium circulation pipe for a long time, An object of the present invention is to provide a boiler comprising a combustion device capable of effectively combusting a solid fuel powder that can be improved and a heat exchanger that efficiently exchanges heat, and an operation method thereof.

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 first object of the present invention is to provide a combustion chamber in which combustion of solid fuel occurs; And a screw feeder provided on one side of the combustion chamber and having a cylindrical shape and arranged in parallel along the outer shape and formed as a pipe and rotatable to feed the solid fuel through a rotation operation, Feeder; Wherein the solid fuel is injected through the fuel feeder into the combustion grate device through the fuel feeder and into the combustion grate device through the fuel feeder, And is moved to a discharging portion located at a lower end portion of the mobile grate device as a reciprocating action of the moving grate, and is gradually burned, and at least one grate among the fixed grate and the moving grate Characterized in that the longitudinal grate is longer than one stroke length of the moving grate by the driving device and at least one of the long axis grate is installed in the movable grate device. Device. ≪ / RTI >

Also, the long axis grate may be installed at the position of the moving grate.

And the long axis grate is installed at a position of the fixed grate.

Also, the long axis grate may be installed at both the stationary grate and the moving grate.

In addition, the long axis grate may be smaller than the total number of grate devices of the mobile grate device.

A CO sensor for measuring the concentration of carbon monoxide contained in the combustion gas of the solid fuel, the CO sensor being provided in the combustion chamber above the grate device; and a controller for receiving the carbon monoxide concentration measurement value from the CO sensor, And a control unit for controlling the length and speed of the moving grate by one stroke.

The control unit may shorten the one stroke length of the moving grate under the CO sensor or reduce the one stroke velocity when the carbon monoxide concentration measurement value is higher than the preset carbon monoxide reference value.

Further, the control unit may shorten the one stroke length of the moving grate or decrease the one stroke velocity when the average value of the plurality of measured carbon monoxide concentration values is higher than the preset carbon monoxide reference value.

The combustion gas guiding unit may further include a combustion gas guiding unit disposed at an upper portion of the grate apparatus in the combustion chamber and inclined in a direction from one side of the combustion chamber, In the traveling path, a combustion gas flow regulating portion is provided to slow down the upward-moving speed of the combustion gas to the one side, or the combustion gas is temporarily stagnated.

Further, the combustion gas flow control unit may include a protrusion that is vertically downwardly formed at one end of the combustion gas guiding unit.

The combustion gas flow control unit may include a slope changing part formed such that a slope is gently formed on a part of the combustion gas guiding part or a sloping direction is inclined in the one direction from the other direction.

The combustion gas barrier plate, which is plate-shaped and has an upper surface and a lower surface formed with through-holes, is protruded laterally at one end of the combustion gas guide portion.

And a heat-resistant iron core is provided on the inner circumferential surface of the screw so as to be parallel to the central axis of the screw feeder.

A second object of the present invention is to provide a boiler comprising a heat exchanger, comprising: a combustion apparatus according to any one of claims 1 to 13; and a spiral heat medium circulation pipe in a concentric circle, And a heat exchanger disposed between the piping and having an exhaust gas guiding portion for guiding high temperature exhaust gas to move in a specific direction, and a heat exchanger for efficiently exchanging heat with a combustion device capable of effectively burning the solid fuel powder To the boiler.

The exhaust gas guiding unit may include a baffle disposed alongside the spiral center axis of the heat medium circulation pipe.

The exhaust gas guiding unit may include a spiral guide plate having a helical slidable shape parallel to the spiral center axis of the heat medium circulation pipe.

A third object of the present invention is to provide a method of operating a boiler including a heat exchanger, in which a solid fuel is provided in a combustion chamber in which a solid fuel is combusted, and a solid fuel is injected through a fuel feeder into a moving grate including a fixed grate And transferring a portion of the solid fuel placed on the fixed grate or the upper surface of the moving grate to the next grate at least over three strokes of the moving grate. And a heat exchanger for efficiently exchanging heat with a combustion device capable of effectively combusting the combustion gas.

According to an embodiment of the present invention, the combustion apparatus capable of effectively burning the solid fuel powder can change the length of the moving grate only in a state where the number of grate of the movable grate apparatus is the same, The total number of times of the combustion of the solid fuel is increased and the time for which the solid fuel remains in the combustion chamber is increased so that the effective combustion effect of the solid fuel can be expected.

Further, according to an embodiment of the present invention, by keeping the combustion gas in the combustion chamber for a longer time, it can be maintained at a high temperature inside, and in the process, the combustible gas contained in the combustion gas is continuously burned, The combustion key has an effect that an effect can be expected.

According to an embodiment of the present invention, a flow of exhaust gas at a high temperature rising up to a central portion of the heat exchanger is induced, and the exhaust gas can uniformly contact with the heat medium circulation pipe for a long time, It has an effect that can be improved.

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.

Figure 1 is a cross-sectional view of a conventional combustion device for a solid fuel having a movable grate device
Figure 2. The reciprocating movement of a moving grate in a conventional portable grate device for solid fuel and the resulting movement of solid fuel
3 is a side view of the operation of the movable grate device and the step of moving the solid fuel, which can be applied to the combustion device capable of effectively burning the solid fuel powder according to the embodiment of the present invention,
FIG. 4 is a side view of the operation of the movable grate device and the step of moving the solid fuel, which can be applied to the combustion device capable of effectively burning the solid fuel powder according to the embodiment of the present invention, wherein the fixed grate length is twice longer than the one stroke length
5 is a side view of a mobile grate device in which a moving grate is installed at the bottom of the grate device, which is twice as long as one stroke, which can be applied to a combustion device capable of effectively burning a solid fuel powder according to an embodiment of the present invention.
FIG. 6 shows a side view of the operation of a single-stroke-length short-acting movable grate device and the stage of transferring a solid fuel, which can be applied to a combustion device capable of effectively burning a solid fuel powder according to an embodiment of the present invention.
7 is a side view of a movable grate device in which a moving grate is fused with a long axis grate and a stroke reduction method, which can be applied to a combustion device capable of effectively burning a solid fuel powder according to an embodiment of the present invention .
8 is a side view in which a temperature sensor and a CO sensor capable of measuring carbon monoxide concentration are installed in a combustion device capable of effectively burning the solid fuel powder according to an embodiment of the present invention.
FIG. 9 is a diagram illustrating a method of controlling a combustion profile based on a temperature measurement value and a CO concentration measurement value in a combustion apparatus capable of effectively burning a solid fuel powder according to an embodiment of the present invention.
10 is a side view of the combustion gas guiding portion 113 applied to the combustion apparatus for a solid fuel having a conventional movable grate device
11. Fig. 11 is a side view of the combustion gas induction unit 113 provided with the combustion gas flow regulating unit 112 applied to the combustion apparatus capable of effectively burning the solid fuel powder according to the embodiment of the present invention
12 shows a top view and a side view of a heat exchanger used in a conventional solid fuel combustion apparatus having a movable grate device
13 is a plan view of a baffle type heat exchanger applicable to a boiler including a combustion device capable of effectively burning a solid fuel powder according to an embodiment of the present invention and a heat exchanger for efficiently exchanging heat, Fig.
Fig. 14 is a cross-sectional view of a screw-type feeder applicable to a boiler including a combustion device capable of effectively burning a solid fuel powder according to an embodiment of the present invention and a heat exchanger for efficiently exchanging heat;

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, the detailed description of known functions and configurations incorporated herein will be omitted when it may unnecessarily obscure the subject matter of the present invention.

The same reference numerals are used for portions having similar functions and functions throughout the drawings. Throughout the specification, when a part is connected to another part, it includes not only a case where it is directly connected but also a case where the other part is indirectly connected with another part in between. In addition, the inclusion of an element does not exclude other elements, but may include other elements, unless specifically stated otherwise.

Hereinafter, the structure and functions of a boiler including a heat exchanger for efficiently exchanging heat and a combustion device capable of effectively burning the solid fuel powder according to an embodiment of the present invention will be described.

FIG. 3 is a side view of a moving grate-like long movable grate device capable of being applied to a combustion device capable of effectively burning a solid fuel powder according to an embodiment of the present invention and a stage of moving a solid fuel.

As shown in FIG. 3, the solid fuel (①, ②, ③, ④, ⑤, ⑥) moved by the grate can be transported to the grate where the solid fuel ②, Can be confirmed that there is no change.

FIG. 3A is a side view of the moving grate in a shifted reference position. FIG. The length of the moving grate is longer than the fixed grate length and the length of one stroke of the moving grate is equal to the length of the fixed grate.

3B shows that when the moving grate is moved by one stroke ("push stroke"), the moving grate is longer by one stroke, and at the same time, the solid fuel (①, ④) located on the upper side of the fixed grate is pushed by the moving grate, Move to the upper surface of the moving grate.

3C is a side view of a state in which the moving grate is moved to the movement reference position in the state of FIG. 3B in a second movement ("pull stroke"). ③ and ⑥ of the solid fuel on the upper surface of the moving grate are moved to the next fixed grate by being pushed by the fixed grate.

3A to 3C, when the moving grate is compared before and after the two-stroke movement, it can be confirmed that the moving grate where the solid fuel 2 and the solid fuel 5 are located is the same, but only the horizontal position moves.

Therefore, in the combustion apparatus capable of effectively burning the solid fuel powder according to the embodiment of the present invention, by changing the length of the moving grate only in the state where the number of grate of the movable grate device is the same, The total number of strokes to be moved is increased, and the effective combustion of the solid fuel can be expected by increasing the time for the solid fuel to remain in the combustion chamber and burn.

FIG. 4 is a side view of the operation of a fixed grate-type long grate device and the step of transferring solid fuel, which can be applied to a combustion device capable of effectively burning solid fuel powder according to an embodiment of the present invention.

As shown in FIG. 4, the length of the fixed grate is longer than the length of the moving grate, and one stroke of the moving grate is equal to the length of the moving grate. In this case, comparing the two strokes of the moving grate, there is an effect that the remaining time in the combustion chamber of the solid fuel is increased as in the combustion apparatus shown in Fig. 3 because the fixed grate is located at the same position .

3 and 4, when the length of the fixed grate or the moving grate is longer than one stroke of the moving grate, in the mobile grate apparatus in which the fixed grate and the moving grate are alternately arranged, the solid fuel remains in the combustion chamber So that the burning time is also prolonged.

2, when the lengths of the fixed grate and the moving grate are the same, and one stroke of the moving grate is equal to the grate length, the solid fuel that is introduced into the combustion chamber and moved by the grate causes the two strokes of the moving grate When reciprocating, it is moved to the next grate. Therefore, when the total number of grate is N, the solid fuel injected into the charging part moves to the discharging part when the number of times of 2N + 1 strokes has elapsed.

However, if a grate having a major axis longer than one stroke is mounted as shown in FIG. 3 or 4, the grate is moved to the next grate during the four-stroke reciprocating motion of the moving grate. Therefore, when the total number of grate is N, the solid fuel injected into the charging unit moves to the discharging portion when the number of times of 4N + 1 strokes passes.

Therefore, the combustion apparatus to which the grate apparatus according to an embodiment of the present invention is applied can increase the residence time of the solid fuel by up to 2 times by varying the length of the grate and the length of one stroke, There is an advantage. In addition, since the fixed grate or the moving grate can be replaced by one grate and can be partially disposed, the solid fuel remaining time of the grate apparatus specific section can be changed according to the combustion state of the fuel used and the combustion performance of the combustion apparatus There is an advantage to be able to control.

5 shows a side view of a mobile grate device in which a moving grate is installed at the bottom of the grate device, which is twice as long as one stroke, which can be applied to a combustion device capable of effectively burning a solid fuel powder according to an embodiment of the present invention .

The water contained in the fuel evaporates at the upper part of the grate device which is close to the input part into which the solid fuel is injected, and a combustion phenomenon accompanies the flame. On the other hand, at the bottom of the grate device, which is close to the discharge, the solid fuel is transformed into charcoal. In this case, since the combustion time required for the fuel located in the upper part and the lower part is different, it is necessary to control the combustion time of the solid fuel in the two areas. Therefore, as shown in FIG. 5, if the long-axis grate is disposed in a part of the grate device, the combustion time of the solid fuel can be controlled without changing the structural form of the combustion device or the drive device. It is possible to realize a combustion device having an effective combustion characteristic.

FIG. 6 shows a side view of the operation of a one-stroke-length short-acting movable grate device and the stage of transferring a solid fuel, which can be applied to a combustion device capable of effectively burning a solid fuel powder according to an embodiment of the present invention.

6, when the lengths of the fixed grate and the moving grate are made the same, and the one stroke of the moving grate is set shorter than the grate length, the effect of delaying the movement of the solid fuel by the shorter length is shown. There may be an effect of expanding the fuel combustion time similar to the case shown in Figs. In the case shown in Fig. 6, since the long-axis grate is not used, the length of the entire combustion apparatus is not increased, so that the present invention can be applied to a case where the already-manufactured combustion apparatus and the installation site are narrow.

As mentioned above, solid fuels have various combustion types. The amount of oxygen supplied, the amount of fuel to be supplied, the amount of self-heating, etc., depending on the state of the fuel including the kind of material and the moisture content of the fuel, The same necessary combustion factors are very diverse. That is, factors such as the fuel composition, the fuel supply amount, the supply amount, and the self-heating which affect the efficient combustion vary depending on the combustion stage.

Therefore, the user must be able to set up and operate various types of combustion profiles in each section of the temporal or staged flow where solid fuel is injected and burned out.

7 is a side view of a movable grate device in which a moving grate is fused with a long axis grate and a stroke reduction method, which can be applied to a combustion device capable of effectively burning a solid fuel powder according to an embodiment of the present invention. Respectively. As shown in FIG. 7, when the long axis grate is fused with the stroke length shortening method, more various types of combustion condition control and combinations thereof are possible. Therefore, regardless of the type of solid fuel to be used, There is an advantage.

Particularly, as mentioned above, in addition to a fuel made of a single material such as pellets, solid fuel uses waste energy that is used or solidified as industrial-household waste. Therefore, the combustion apparatus according to one embodiment of the present invention is advantageous in that it can provide a combustion profile suitable for various kinds of materials by changing the grate structure and the operation method.

As mentioned earlier, in order to optimize the combustion profile of the combustion stage of the fuel, it is necessary to grasp the combustion characteristics of the current combustion stage. The most representative physical quantities for evaluating the combustion characteristics are the carbon monoxide (CO) concentration and the temperature of the combustion gas emitted in the combustion process.

FIG. 8 shows a side view in which a temperature sensor and a CO sensor 111 capable of measuring carbon monoxide concentration are installed in a combustion apparatus capable of effectively burning the solid fuel powder according to an embodiment of the present invention. As can be seen from FIG. 8, a temperature sensor and a CO concentration sensor are mounted on the upper part of the grate device leading from the charging part to the discharging part, and by checking the combustion condition for each section, it is possible to obtain a physical quantity important for judging combustion characteristics for each section . Based on the measured temperature and CO concentration, it is possible to design a mobile grate structure capable of determining a problem such as a fuel input amount, a fuel distribution in a grate and a combustion speed, and forming a combustion profile as shown in Fig. 7 . In addition, it is possible to verify the combustion efficiency of a modified or newly designed mobile grate structure, so that it is possible to indirectly control the influence of the fuel constituent material and the content which can not be confirmed by the user.

FIG. 9 shows a configuration of a high-efficiency combustion profile setting method based on a temperature measurement value and a CO concentration measurement value in a combustion apparatus capable of effectively burning a solid fuel powder according to an embodiment of the present invention.

As shown in FIG. 9, in order to set the high-efficiency combustion profile, the control unit determines the measurement efficiency based on the measured values measured by the temperature sensor and the CO sensor shown in FIG. 8, and stores the measured value 0 in the memory do. And transmits the state information of the section requiring the improvement of the combustion apparatus and the determination result information to the user. The resulting information may include temperature, CO measurements, measurements by location, and changes by measurement time, as well as the current profile. The user completes an improvement operation such as one stroke length and speed in the driving device and the grate device, and replacement of the grate in the grate device, and restarts the combustion device. The control unit compares the measurement value 1, which is measured again after being restarted, with the measurement value 0 stored in the memory unit, and determines the improvement status and transmits the improvement status information to the user. Through this feedback verification, it is possible to design and change the grate device and the driving method suitable for the actual situation.

FIG. 10 shows a side view of a combustion gas inducing part 113 which is applied to a conventional solid-fuel combustion device having a movable grate device.

The combustion gas guiding portion prevents the combustion gas, which is separated from the flame by charcoal, from moving directly to the heat exchanger 140. The combustion gas can be kept at a high temperature inside due to the effect of keeping the combustion gas in the combustion chamber for a longer period of time and there is an effect that the combustible gas in the combustion gas is continuously burned in the process. Particularly, it can be expected that the flame generated in the vicinity of the fuel inlet is burnt to further burn the normalized carbon contained in the exhaust gas. However, since the rising velocity of the combustion gas is high in the structure shown in FIG. 10, it is difficult to expect a great effect.

11 shows a side view of a combustion gas induction unit 113 equipped with a combustion gas flow control unit 112 applied to a combustion apparatus capable of effectively burning the solid fuel powder according to an embodiment of the present invention. As shown in FIG. 11, the combustion gas flow control unit is provided on the lower surface of the combustion gas induction unit 140, and may include the inclination changing unit 114 and the combustion gas blocking plate 116.

The inclination changing section 114 forms a part different in inclination from the bottom surface of the combustion gas guiding section, so that the exhaust gas rising in the upward direction from the lower part of the grate can temporarily stay or slow down the rising speed.

Further, by arranging a plurality of inclined changing portions, as shown in Fig. 7, it is possible to fuse with a complex grating structure and to realize an efficient combustion apparatus.

The flue gas blocking plate 115 may be provided in parallel with the inclination changing portion, and may be disposed vertically above the flame generating point, as shown in FIG. 11C. The rising speed of the combustion gas on the flue gas blocking plate is reduced, and the combustion action of the flammable gas can be activated due to the flame below. This structure has the effect of lowering the carbon monoxide (CO) concentration of the exhaust gas from at least 1/10 to 3/1000.

FIG. 12 is a plan view and a side view of a heat exchanger used in a conventional solid fuel combustion apparatus having a movable grate device. FIG. 13 is a plan view and a side view of a heat exchanger used in a combustion apparatus for a solid fuel according to an embodiment of the present invention, And a heat exchanger for efficiently exchanging heat with the heat exchanger.

As shown in Fig. 12, a conventional heat exchanger is formed of a spiral concentric circle in which a heat medium pipe through which a heating medium can pass is a pipe. The exhaust gas of high temperature comes up from the center of the concentric circle, and after the heating medium circulation pipe is heated, it is discharged by the exhaust interlocking operation under the heat exchanger.

In the conventional structure, since the hot exhaust gas rising upward flowing into the center portion of the heat exchanger is discharged at the shortest distance to the exhaust communication portion under the heat exchanger, the heat exchange efficiency can be lowered. Therefore, it is necessary to improve the heat exchange efficiency by inducing the flow of the exhaust gas and making the exhaust gas uniformly contact with the heat medium circulation pipe for a long time.

13 is a plan view of a baffle type heat exchanger applicable to a boiler including a combustion device capable of effectively burning a solid fuel powder and a heat exchanger for efficiently exchanging heat according to an embodiment of the present invention, Sectional side view of the device.

13A, baffles 141 are formed between the heat medium circulation pipes. Each baffle can be installed at different heights, and depending on the diameter and height of the heat medium circulation pipe of the heat exchanger, the number of baffles can be further increased. The baffle is a kind of diaphragm that leads the exhaust gas to the exhaust communication. The exhaust gas rising upward flowing into the center of the heat exchanger moves toward the exhaust communication side as it spreads outward. At this time, they are obstructed by baffles having different heights, so that they can not move directly to the exhaust communication, and pass through a path induced by the baffle. The heat exchange efficiency of the exhaust gas and the heat medium circulation pipe can be improved by disposing the exhaust gas so as to maximize the time during which the exhaust gas is in contact with the heat medium circulation pipe. In Fig. 13 (B), a spiral guide plate 142 having a spiral sliding structure is formed between the heat medium circulation pipes. The swirling phenomenon caused by the baffle which may appear in the baffle type can be minimized and the natural descent can be induced.

That is, the baffle and the helical induction plate shown in FIGS. 13A and 13B induce the exhaust gas to be discharged along a specific downward discharge path for efficient heat exchange in the process of exhausting the exhaust gas to the exhaust communication, which is raised to the center of the heat exchanger And can be selected or combined depending on the design elements of the boiler including the flow rate of the exhaust gas and the length of the heat exchange circulation pipe.

14 is a sectional view of a screw feeder with a steel wire 151 applicable to a boiler including a combustion device capable of effectively burning solid fuel powder according to an embodiment of the present invention and a heat exchanger for efficiently exchanging heat Respectively.

As shown in Fig. 1, the solid fuel feeder is an apparatus for injecting solid fuel powder from the outside of the combustion chamber into the combustion chamber, and generally a screw type feeder is used. The combustion step starts from the moment the solid fuel introduced from the outside of the combustion chamber enters the inside of the combustion chamber. As described above, the evaporation combustion phenomenon occurs at the beginning of the combustion of the solid fuel, and the moisture of the solid fuel evaporates and hardens in a lump form. If the screw feeder continues to rotate in this state, the feeder may be destroyed. If the screw feeder is moved by the grate device in a lump shape, it is difficult to expect an effective combustion phenomenon.

14, by attaching three steel wires 151 to the inner diameter of the spring-shaped feeder, it is possible to prevent breakage of the solid fuel due to the hard cured solid fuel in the combustion chamber, Can be expected.

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 .

A. Fixed grate
B. Moving grate
C. 1 stroke length
100. Combustion device
110. Combustion chamber
111. CO sensor
112. Combustion gas flow regulator
113. Combustion gas guide
114. Slope changing section
115. Flue gas barrier plate
120. Driving device
130. Portable grate device
131. Fixed grate
132. Moving grate.
140. Heat Exchanger
141. Baffle
142.
150. Fuel feeder
151. Steel wire

Claims (17)

A combustion chamber in which combustion of the solid fuel occurs;
And a screw feeder provided on one side of the combustion chamber and having a cylindrical shape and arranged in parallel along the outer shape and formed as a pipe and rotatable to feed the solid fuel through a rotation operation, Feeder;
A firing power grating device provided in the combustion chamber, the firing power grating device including a fixed grate and a moving grate;
And a driving device for moving the moving grate,
The solid fuel is introduced through the fuel feeder into the inlet located at the upper end of the movable grate device at one side and moved to the outlet at the lower end of the movable grate device at the other side by the reciprocating action of the moving grate, Lt; / RTI >
Wherein at least one of the fixed grate and the moving grate is a long-axis grate with a length greater than one stroke of the moving grate by the driving device,
Wherein the movable grate device is provided with at least one long-shrunken grate capable of effectively burning the solid fuel powder. The method according to claim 1,
Wherein the long-axis grate is installed at the position of the moving grate. The method according to claim 1,
Wherein the long-axis grate is installed at a position of the fixed grate. The method according to claim 1,
Characterized in that the long-axis grate is installed at both the stationary grate and the moving grate. A combustion device capable of effectively burning the solid fuel powder 5. The method of claim 4,
Characterized in that said long-axis grate is smaller than the total number of grate devices of said mobile grate device, characterized in that said combustion device The method according to claim 1,
A CO sensor provided in the combustion chamber above the grate device to measure the concentration of carbon monoxide contained in the combustion gas of the solid fuel,
Further comprising: a controller for receiving the carbon monoxide concentration measurement value from the CO sensor and controlling the length and speed of the moving grate by one stroke of the driving device. The method according to claim 6,
If the control unit determines that the carbon monoxide concentration measurement value is higher than the preset carbon monoxide reference value,
Wherein a length of one stroke of the moving grate below the CO sensor is shortened or a one-stroke velocity is shortened, wherein the solid fuel powder can be effectively burned. The method according to claim 6,
Wherein the control unit shortens the one stroke length of the moving grate or reduces the one stroke velocity when the average value of the plurality of measured values of the carbon monoxide concentration is higher than the predetermined carbon monoxide reference value, The combustion device. 8. The method according to any one of claims 1 to 7,
Further comprising a combustion gas guiding part disposed above the grate device in the combustion chamber and tilted in one direction,
Wherein the combustion gas guiding portion is provided with a combustion gas flow regulating portion in a path in which the combustion gas of the solid fuel burned at the lower end portion ascends-moves to the upper end portion, so that the rising- Or the combustion gas is temporarily stagnated. The combustion apparatus according to any one of claims 1 to 3, wherein the combustion gas is temporarily stagnated. 10. The method of claim 9,
Wherein the combustion gas flow regulating section includes a projection that is vertically downwardly curved at one end of the combustion gas guiding section, wherein the combustion gas flow regulating section is capable of effectively burning the solid fuel powder. 10. The method of claim 9,
Wherein the combustion gas flow control unit includes a gradient changing unit formed such that a slope is gently formed on a part of the combustion gas guiding unit or a slanting direction is inclined in the one direction from the other direction. Combustion device capable of burning. 10. The method of claim 9,
A combustion device capable of effectively burning a solid fuel powder characterized in that a combustion gas barrier plate having a plate shape and a through hole is formed so as to protrude laterally from one end of the combustion gas guide portion. The method according to claim 1,
Wherein the heat-resistant iron core is provided on the inner circumferential surface of the screw in parallel with the central axis of the screw feeder. In a boiler comprising a heat exchanger,
A combustion apparatus according to any one of claims 1 to 13,
Wherein the heat medium includes a concentric helical thermal medium circulation pipe and a heat exchanger formed between the heat medium circulation pipes and having an exhaust gas guiding portion for inducing a high temperature exhaust gas to move in a specific direction, A boiler comprising a heat exchanger for efficiently exchanging heat with a combustion device capable of effectively combusting the boiler, 15. The method of claim 14,
Wherein the exhaust gas guiding unit includes a baffle disposed in parallel with a spiral center axis of the heat medium circulation pipe and includes a combustion device capable of effectively burning the solid fuel powder and a heat exchanger that exchanges heat efficiently Boilers, 15. The method of claim 14,
Wherein the exhaust gas guiding portion includes a spiral guide plate having a helical sliding shape in parallel with a spiral center axis of the heat medium circulation pipe, and a combustion apparatus capable of effectively burning the solid fuel powder and a heat exchanger Including boilers, A method of operating a boiler comprising a heat exchanger,
The solid fuel is delivered through a fuel feeder to a moving grate having a fixed grate and a moving grate furnace, the solid fuel being provided in a combustion chamber in which the solid fuel is burned;
Wherein a portion of the solid fuel placed on the fixed grate or the upper surface of the moving grate is transported to the next grate when at least three strokes of the moving grate are to be transported to the next grate. And a heat exchanger for efficiently exchanging heat with the combustion device.

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