KR20160008283A - Bubbling fluidized bed combustor integrated with boiler - Google Patents

Abstract

The present invention relates to a bubbling fluidized bed combustion path integrated with a boiler. The present invention comprises: a main combustion path and a bubbling fluidized bed combustion path; a first combustion air supply means installed on one inner side of the main combustion path; a second combustion air supply means supplying a combustion air from the outside; a third combustion air supply means installed one inner side of a second combustion path; a waste heat recovery boiler having a first waste heat recovery unit having a gas chamber, an upper steam drum, a lower water drum, and a plurality of first water pipes; a heat exchanging unit; and a second waste recovery unit having a plurality of second water pipes. According to the present invention as described above, efficiency of collecting foreign substances is improved to prevent a water pipe of a waste heat recovery boiler from being worn to increase durability.

Description

[0001] The present invention relates to a bubbling fluidized bed combustor integrated with boiler,

The present invention relates to a boiler-integrated bubble-fluidized bed combustion furnace, and more particularly, to a boiler-integrated bubble-fluidized bed combustion furnace capable of improving combustion efficiency and heat recovery efficiency of a bubbling fluidized bed combustion furnace.

Generally, a fluidized bed combustion furnace has a wide receiving width for fuel, convenient facilities such as desulfurization and dehalogenation in the furnace, easy temperature control in the furnace, and incineration at a relatively low temperature, so that the nitrogen product is small and the fuel mixing effect in the furnace It has excellent advantages and merits of being able to cope with other fuels. It uses high temperature heat obtained by burning "renewable energy" such as fossil fuels such as coal, biomass such as waste wood, biogas and dry sewage sludge, Has been applied to cogeneration and power generation boilers that produce steam for industrial use, factories, and district heating.

For this reason, recently, a waste heat recovery boiler is integrally formed on the side of a fluidized bed combustion furnace, and exhaust gas discharged from a fluidized bed combustion furnace is discharged through a waste heat recovery boiler while recovering waste heat of the exhaust gas through a water pipe installed in the waste heat recovery boiler, Which is used as a boiler-integrated fluidized bed combustion furnace.

However, in the conventional boiler integrated fluidized bed combustion furnace, the exhaust gas discharged from the fluidized bed combustion furnace passes straight through the waste heat recovery boiler, so that particulate matter such as dust contained in the exhaust gas hits the water tube installed in the waste heat recovery boiler, In addition, since the exhaust gas passes through the waste heat recovery boiler in a linear manner, the efficiency of heat recovery and the efficiency of collecting foreign matter such as dust contained in the exhaust gas are poor.

1, since the combustion air supplied into the fluidized bed combustion furnace 100 through the blowing means 200 is injected through the nozzle 300 installed perpendicular to the wall surface of the fluidized bed combustion furnace, A dead zone in which combustion air is not supplied to the edge of the furnace is generated, and the combustion efficiency is poor.

Korean Patent No. 1309279

SUMMARY OF THE INVENTION It is an object of the present invention to provide a boiler-integrated bubble-fluidized bed combustion furnace for burning high-calorific fuel, which is capable of minimizing the combustion efficiency, heat recovery efficiency, generation of carbon monoxide and thermal NOx, The present invention provides a boiler integrated bubble-fluidized bed combustion furnace capable of further improving the dust collecting efficiency of particulate matter such as dust contained in the boiler.

According to an aspect of the present invention for achieving the above object, there is provided a fuel cell system including a main combustion furnace having a fuel injection port formed on one side of an outer surface thereof, a fluidizing medium accommodated therein and a first combustion burner installed on the other side, And a second combustion furnace in which a second combustion furnace is installed, and a first combustion air supply means for supplying combustion air from the outside and fluidizing the fluid medium, provided at one side of the inside of the main combustion furnace, A second combustion air supply means provided on the first combustion air supply means on one side of the main combustion furnace to supply combustion air from the outside and a second combustion air supply means provided on one side of the second combustion furnace, And a gas chamber chamber provided on a side of the first combustion furnace, and a second combustion air supply means And a first waste heat recovery unit including an upper steam drum, a lower water drum, and a plurality of first water tubes for connecting between the upper steam drum and the lower water drum, and a first waste heat recovery unit including a waste heat recovery boiler And a third water pipe connected to the first waste heat recovering unit is arranged in a zigzag manner, and an inner wall of the second combustion furnace and the waste heat recovering boiler is connected to the first waste heat recovering unit And a second waste heat recovery unit including a plurality of second water tubes that are connected to the second waste heat recovery unit.

Here, the waste heat recovery boiler is provided with a first vertical partition wall that divides the gas chamber chamber and the first waste heat recovering section, and a first vertical partition wall for guiding the exhaust gas discharged from the second combustion furnace to the gas chamber chamber And a second vertical partition wall for dividing the first waste heat recovering portion to the left and right is provided to guide the exhaust gas discharged from the gas chamber chamber to the first waste heat recovering portion, And a third exhaust passage for guiding the exhaust gas from the upper portion to the lower portion, and the heat exchanging portion is formed with a fourth exhaust passage for guiding the exhaust gas discharged from the waste heat recovery boiler from the lower portion to the upper portion.

Further, it is more preferable that a discharge port is formed in the bubbling fluidized bed combustion furnace, below the gas chamber chamber, the first waste heat recovering portion, and the heat exchange portion.

The second combustion air supply means and the third combustion air supply means are provided inside the bubbling fluidized bed combustion furnace and have an inlet port through which combustion air flows into one side and an air And a spray nozzle having a chamber and an end, each of which is provided in the plurality of spray holes and the other end is formed so as to be inclined outwardly of the combustion air storage portion.

The first waste heat recovering unit may further include a protective cover on one side of the first water pipe into which the exhaust gas discharged from the gas chamber chamber flows.

The bubble fluidized bed combustion apparatus according to any one of claims 1 to 3, further comprising a fluid medium discharge section provided at a lower portion of the bubbling fluidized bed combustion furnace, wherein the fluid medium discharge section includes a vibration discharge pipe arranged opposite to a lower portion of the bubbling fluidized bed combustion furnace, And a separating conveyor installed at a lower portion of the vibration screen.

According to the present invention, since the combustion efficiency and heat recovery efficiency of the boiler integrated bubbling fluidized bed combustion furnace are improved, not only the economical efficiency is improved but also the generation of carbon monoxide and thermal NOx is minimized and the particulate matter such as dust contained in the exhaust gas Since the dust collecting efficiency is improved, the water tube of the waste heat recovery boiler is prevented from being worn, thereby improving durability.

1 is a schematic view showing a flow in which combustion air is supplied to an upper portion of a conventional fluidized bed combustion furnace.
2 is a schematic view showing a boiler-integrated bubble-fluidized bed combustion furnace according to an embodiment of the present invention.
3 is a front view showing a combustion air injection unit of second and third combustion air supply means according to a temporal example of the present invention.
4 is a rear view showing a combustion air injection unit of the second and third combustion air supply units according to the embodiment of the present invention.
5 is a plan view showing a combustion air injection unit of the second and third combustion air supply units according to an embodiment of the present invention.
6 is a schematic view showing a fluid medium discharge unit according to an embodiment of the present invention.
FIG. 7 is a schematic view showing a discharge flow of exhaust gas in a boiler-integrated bubbling fluidized bed combustion furnace according to an embodiment of the present invention.
8 is a schematic view showing the flow of combustion air injected into the bubbling fluidized bed combustion furnace through the second and third combustion air supply means according to an embodiment of the present invention.

Hereinafter, the present invention will be described in detail with reference to the drawings. It is to be noted that like elements in the drawings are represented by the same reference numerals as possible. Further, detailed description of known functions and configurations that may unnecessarily obscure the gist of the invention will be omitted.

2 is a schematic view showing a boiler-integrated bubble-fluidized bed combustion furnace according to an embodiment of the present invention.

2, the boiler integrated bubble-fluidized bed combustion furnace 1 according to an embodiment of the present invention includes a bubble fluidized bed combustion furnace 10, a first combustion air supply means 20, a second combustion air supply means 30, A third combustion air supply unit 40, a waste heat recovery boiler 50, a second waste heat recovery unit 60, and a heat exchange unit 70.

The bubbling fluidized bed combustion furnace 10 includes a main combustion furnace 11 and a second combustion furnace 12.

The main combustion furnace 11 is provided with a fuel inlet 11a at one side of the outer surface thereof and a first combustion burner 11c at the other side thereof.

In order to prevent local combustion or locally heat accumulation in the main combustion furnace due to the injection of the solid fuel into the fuel inlet 11a in one direction, it is preferable that at least two fuel injection openings 11a are formed .

The flow medium 11b is floated above the bubbling fluidized bed combustion furnace 10 through the first combustion air supply means 20 and mixed with the solid fuel to be injected so that the solid fuel can be uniformly combusted. Any one of alumina oxide or sand may be used.

The first combustion burner 11c burns light oil, biogas or the like to raise the temperature inside the main combustion furnace 11 to a predetermined temperature.

The second combustion furnace 12 is vertically extended on the main combustion furnace 11 and has a second combustion burner 12a at one side and an urea water supply means 12b at an upper side.

 Here, the second combustion burner 12a serves to burn the biogas or the like to maintain the temperature inside the second combustion furnace 12 at a predetermined temperature.

The urea water supply means 12b serves to purify the nitrogen oxide contained in the exhaust gas generated in the second combustion furnace 12 due to the combustion of the solid fuel.

The first combustion air supply means 20 is installed in the lower part of one side of the main combustion furnace 11 so as to be buried in the inside of the fluidizing medium 11b and as shown in the enlarged view, And a nozzle 22 coupled to each of the distribution pipes 21a of the manifold 21, the manifold 21 having a plurality of distribution pipes 21a formed on one side of the outer surface thereof, And serves to fluidize the fluidizing medium 11b by supplying the combustion air from the first blowing means 85 provided outside and to supply the combustion air into the main combustion furnace 11. [

It is preferable that the air supplied through the first combustion air supply means 20 is supplied in an amount of 55 to 65% of the amount of air required to burn the renewable energy of a high heat amount such as a solid fuel to be supplied to the discharge port 75 .

The second combustion air supply means 30 is installed on the upper portion of the first combustion air supply means 20 in one side of the main combustion furnace 11 and receives the combustion air from the second blowing means 95 installed on the outside And serves to supply combustion air into the main combustion furnace 11. [

The second combustion air supply means 30 is preferably disposed at a position directly below the fuel inlet 11a, that is, at a position where the main combustion furnace 11 ends, and the solid fuel It is preferable that 25 to 35% of the amount of air necessary for combusting the renewable energy with a high heating amount such as the amount of air is supplied.

The third combustion air supply means 40 is installed at one side of the second combustion furnace 12 and receives combustion air from the second blowing means 95 installed in the outside, .

It is preferable that the third combustion air supply means 40 is disposed directly above the fuel inlet 11a, that is, at a portion where the second combustion furnace 12 starts, and the third combustion air supply means 40 is disposed in the bubbling fluidized bed combustion furnace 10 It is desirable that 20 to 25% of the amount of air required to burn renewable energy with a high heating amount such as solid fuel is supplied.

As described above, in the boiler integrated bubbling fluidized bed combustion furnace 1 according to the present invention, the second combustion furnace 12 is vertically extended to an upper portion of the main combustion furnace 11, The combustion efficiency of the bubbling fluidized bed combustion furnace 10 is further improved by injecting the air necessary for burning the renewable energy of the bubbling fluidized bed combustion furnace 10 by dividing and injecting air through the first, second and third combustion air supply means 20, 30 and 40 , Carbon monoxide and thermal NOx generation can be minimized.

The waste heat recovery boiler 50 is integrally connected to the side of the second combustion furnace 12 and comprises a gas chamber chamber 51 and a first waste heat recovery unit 52.

The gas chamber chamber 51 is provided with a region through which exhaust gas discharged from the second combustion furnace 12 is discharged and is divided by the first vertical partition 51a into a first waste heat recovering portion 52, A first exhaust passage 51b for guiding the exhaust gas discharged from the furnace 12 from the upper portion to the lower portion is formed.

In addition, by forming the gas chamber chamber 51 to have a sufficient space, the exhaust gas flowing in from the second combustion furnace 12 flows into the gas chamber chamber 51, Particulate foreign matter such as dust falls to the lower portion of the gas chamber chamber 51 due to its own weight and is substantially removed, thereby minimizing the inflow of particulate matter such as dust, which is introduced together with the exhaust gas into the first waste heat recovering portion 52 The first water pipe 52c of the first waste heat recovering unit 52 can be minimized from being worn out due to particulate matter such as dust or the like.

The first waste heat recovering section 52 is provided at the side of the gas chamber chamber 51 and includes an upper steam drum 52a, a lower water drum 52b, an upper steam drum 52a, and a lower water drum 52b. And a plurality of first water pipes 52c connecting the first and second water pipes 52a and 52b and collecting the waste heat from the discharged exhaust gas to convert water into steam.

Here, the lower water drum 52b serves to store water supplied from the outside, and the first water pipe 52c recovers waste heat from the discharged exhaust gas to convert the water contained therein to steam, The upper steam drum 52a serves to store generated steam.

The steam stored in the upper steam drum 52a is supplied as a separate steam supply source.

The first waste heat recovering unit 52 includes a second exhaust passage 52f divided into right and left by the second vertical partition 52e and guiding the exhaust gas discharged from the gas chamber chamber 51 therein from the bottom to the top, And a third discharge passage (52g) guiding from the upper portion to the lower portion.

As shown in the enlarged view of the first waste heat recovering portion 52, a protective cover 52d is further provided on one side of the first water pipe 52c into which the exhaust gas discharged from the gas chamber chamber 51 flows. do.

The protective cover 52d serves to prevent the exhaust gas flowing into the first waste heat recovering portion 52 from repeatedly contacting the first water pipe 52c to be worn.

The second waste heat recovery unit 60 is connected to the first waste heat recovery unit 52 and includes a plurality of second water pipes 61 embedded in the inner wall of the second combustion furnace 12 and the waste heat recovery boiler 50 And the second water pipe 61 serves to recover the waste heat from the exhaust gas to convert the water contained therein into steam.

Here, the plurality of second water pipes 61 are connected to the first waste heat recovering portion (the second waste heat recovering portion) 60 to prevent the second waste water recovering portion 60 from being affected by the clogging or breakage of any one of the second water pipes 61 52 are connected in parallel to the upper steam drum 52a.

The third heat pipe 71 is arranged in a zigzag manner and the third heat pipe 71 is connected to the first waste heat recovering part 52. The third water pipe 71 is disposed in the side of the waste heat recovering boiler 50, And collects the waste heat from the exhaust gas to convert the water contained therein to steam.

The third water pipe 71 of the heat exchanging unit 70 is connected to a water supply tank installed outside and the water supply tank is connected to the first waste heat recovering unit 52 through the third water pipe 71 of the heat exchanging unit 70, And the second waste heat recovering unit (60).

A discharge pipe 72 is formed in the upper part of the heat exchanging part 70. Exhaust gas discharged from the heat exchanging part 70 through the discharge pipe 72 is discharged to the outside through a purifier not shown.

The lower part of the bubble fluidized bed combustion furnace 10, the gas chamber chamber 51, the first waste heat recovering section 52 and the heat exchanging section 70 described above is provided with particulate matter such as dust And a discharge port 75 for discharging the gas.

Particularly, the discharge port 75 formed in the lower portion of the bubbling fluidized bed combustion furnace 10 discharges the fluidized medium 11b downward when the incombustible material falling down during combustion and the fluidized medium 11b coagulate and lose their functions. .

FIG. 3 is a front view showing second and third combustion air supply means according to a temporal example of the present invention, and FIG. 4 is a rear view showing second and third combustion air supply means according to an embodiment of the present invention. And FIG. 5 is a plan view showing second and third combustion air supply means according to an embodiment of the present invention.

3 and 5, the second and third combustion air supply means 30 and 40 of the boiler integrated bubble-fluidized bed combustion furnace 1 according to the present invention are provided with an air chamber 35 and an injection nozzle 36 .

The air chamber 35 has an inlet 35a through which combustion air flows from the outside, and a plurality of spray holes 35b at the other side.

The injection nozzle 36 is provided in each of the spray holes 35b as a tubular shape and is formed so as to extend obliquely outwardly of the air chamber 35. [

As described above, the second and third combustion air supply means 30 and 40 include the injection nozzle 36 that is formed to extend obliquely outwardly of the air chamber 35 and the air chamber 35, When the combustion air is supplied into the bubbling fluidized bed combustion furnace 10 through the third combustion air supply means 30 and 40, the supplied combustion air is injected obliquely into the bubbling fluidized bed combustion furnace 10, A swirling flow is generated in the combustion furnace 10, so that the combustion efficiency is improved and the generation of carbon monoxide and thermal NOx can be minimized.

The combustion air flow inside the bubbling fluidized bed combustion furnace 10 through the second and third combustion air supply means 30, 40 will be described in more detail below with reference to the drawings.

6 is a schematic view showing a fluid medium discharge unit according to an embodiment of the present invention.

Referring to FIG. 6, the boiler integrated bubble-fluidized bed combustion furnace 1 according to the present invention further includes a fluid medium discharge unit 80 installed below the bubbling fluidized bed combustion furnace 10.

The fluid medium discharge portion 80 includes a vibration discharge pipe 81, a vibration screen 82 and a separation conveyor 83.

The vibration discharge pipe 81 is arranged to be opposed to the lower portion of the bubble fluidized bed combustion furnace 10 and is inclined in a direction opposite to the direction of the bubble fluidized bed combustion furnace 10. An additional vibration means 84 is provided on one side, So that it can be discharged to the lower part naturally.

The vibrating screen 82 is installed in the lower part of the vibration discharge pipe 81 and a separate vibrating unit 84 is provided at one side to discharge the fluidized medium 11b which is not agglomerated with the incombustible through the vibration, Foreign matter such as nails, wire, iron pieces, etc. contained in the agglomerated fluid medium 11b and the fluid medium 11b are moved laterally and discharged to a separate storage section, whereby the fluid medium 11b and the non-agglomerated fluid medium 11b, Wire and iron pieces contained in the fluidized medium 11b and the fluidized medium 11b.

The separation conveyor 83 serves to discharge the incombustibles passed through the vibration screen 82 and the non-aggregated fluid medium 11b to a separate storage part, and a screw conveyor can be used.

Because of the structure described above, the incombustible matter discharged to the lower portion of the bubbling fluidized bed combustion furnace 10 in a simple structure without a separate mechanical driving portion, the unfused fluidized medium 11b, the incombustible aggregated fluidized medium 11b, (11b) contained in the medium (11b) are efficiently separated and discharged, and the non-agglomerated and unagglomerated flow medium (11b) is re-supplied into the bubbling fluidized bed combustion furnace (10) 10) can be improved and the operating cost can be reduced due to the use of low power.

FIG. 7 is a schematic view showing a discharge flow of exhaust gas in a boiler-integrated bubbling fluidized bed combustion furnace according to an embodiment of the present invention.

Referring to FIG. 7, in the discharge flow of the exhaust gas of the boiler integrated bubbling fluidized bed combustion furnace 1 according to the embodiment of the present invention, the second waste heat recovering portion 60 and the heat exchange The exhaust gas flowing into the gas chamber chamber 51 is moved from the upper part to the lower part along the first exhaust passage 51b of the gas chamber chamber 51 and is again subjected to heat exchange with the second waste heat recovering part 60, 1 waste heat recovering unit 52 as shown in Fig.

The exhaust gas flowing into the first waste heat recovering portion 52 is heat exchanged with the first waste heat recovering portion 52 while moving from the lower portion to the upper portion along the second exhaust passage 52f of the first waste heat recovering portion 52 And then flows again from the upper part to the lower part along the third discharge path 52g of the first waste heat recovering part 52 to be heat-exchanged with the first waste heat recovering part 52 and then flows into the heat exchanging part 70. [

The exhaust gas flowing into the heat exchanging part 70 is moved from the lower part to the upper part along the fourth discharge path 73 of the heat exchanging part 70 and exchanged with the heat exchanging part 70 and discharged through the discharge pipe 72 And is discharged to the outside through a purifier not shown.

As described above, the boiler integrated bubble-fluidized bed combustion furnace 1 according to the present invention is provided with the second combustion path 12 of the bubbling fluidized bed combustion furnace 10 and the first discharge path 51b of the waste heat recovery boiler 50, The heat exchange efficiency with the exhaust gas is ensured because the heat exchange with the exhaust gas is performed in five sections including the exhaust passage 52f, the third exhaust passage 52g and the fourth exhaust passage 73 of the heat exchanging section 70 .

The exhaust gas is supplied to the first exhaust passage 51b, the second exhaust passage 52f and the third exhaust passage 52g of the waste heat recovery boiler 50 and the fourth exhaust passage 73 of the heat exchanging section 70 The dust collecting efficiency of the particulate matter such as dust contained in the exhaust gas is improved and the abrasion of the first water pipe of the first waste heat recovering portion can be minimized.

8 is a schematic view showing the flow of combustion air injected into the bubbling fluidized bed combustion furnace through the second and third combustion air supply means according to an embodiment of the present invention.

8, the second and third combustion air supply means 30 and 40 provided in the bubbling fluidized bed combustion furnace 10 are installed in the injection hole 35b of the air chamber 35 and inject the combustion air When the combustion air is supplied into the bubbling fluidized bed combustion furnace 10 through the injection nozzle 36 due to the structure in which the injection nozzle 36 is disposed obliquely with respect to the air chamber 35, A dead zone in which combustion air is not supplied to the inside of the bubbling fluidized bed combustion furnace 10 is not generated, thereby improving the combustion efficiency and reducing the carbon monoxide and the theoretical NOx.

Although the present invention has been described in connection with the preferred embodiments, it is possible to make various modifications and variations without departing from the spirit and scope of the invention. It is, therefore, to be understood that the appended claims will include all such modifications and changes as fall within the true spirit of the invention.

1: Boiler integrated bubble fluidized bed combustion furnace
10: bubble fluidized bed combustion furnace 11: main combustion furnace
11a: fuel inlet port 11b: fluid medium
11c: a first combustion burner 12: a second combustion furnace
12a: second combustion burner 12b: urea water supply means
20: first combustion air supply means 21: manifold
21a: Distribution pipe 22: Nozzle
30: second combustion air supply means 35: air chamber
35a: Inlet port 35b:
36: injection nozzle 40: third combustion air supply means
50: waste heat recovery boiler 51: gas chamber chamber
51a: first vertical partition 51b: first exhaust passage
52: first waste heat recovering unit 52a: upper steam drum
52b: lower water drum 52c: first water pipe
52d: protective cover 52e: second vertical partition wall
52f: second exhaust passage 52g: third exhaust passage
60: second waste heat recovery unit 61: second water pipe
70: heat exchanger 71: third water pipe
72: discharge pipe 73: fourth discharge pipe
75: Exhaust port 80:
81: vibration discharge pipe 82: vibration screen
83: Separation conveyor 84: Vibration means
85: first blowing means 95: second blowing means

Claims (6)

A main combustion furnace in which a fuel injection port is formed on one side of the outer surface, a fluid medium is accommodated therein, and a first combustion burner is installed on the other side, a second combustion stage in which a second combustion burner is vertically extended on the main combustion furnace, A bubbling fluidized bed combustion furnace;
A first combustion air supply unit installed at one side of the main combustion furnace to supply combustion air from the outside and to fluidize the fluidizing medium;
Second combustion air supply means installed on the first combustion air supply means on one side of the main combustion furnace and supplying combustion air from the outside;
A third combustion air supply means provided at one side of the inside of the second combustion furnace and supplying combustion air from the outside;
And a plurality of first water tubes, each of which is provided at a side of the gas chamber chamber, for connecting the upper steam drum, the lower water drum, and the upper steam drum to the lower water drum, A waste heat recovery boiler including a first waste heat recovery unit including a first waste heat recovery unit
Further comprising a heat exchange unit disposed at a side of the waste heat recovery boiler and having a third water pipe arranged in a zigzag manner therein, the third water pipe being connected to the first waste heat recovery unit,
And a second waste heat recovery unit including a plurality of second water pipes connected to the first waste heat recovery unit on the inner wall of the second combustion furnace and the waste heat recovery boiler. The method according to claim 1,
The waste heat recovery boiler
Wherein a first vertical partition wall dividing the gas chamber chamber and the first waste heat recovering section is provided and a first exhaust passage for guiding the exhaust gas discharged from the second combustion furnace to the gas chamber chamber from the upper part to the lower part is formed,
A second exhaust passage for introducing the exhaust gas discharged from the gas chamber chamber into the first waste heat recovering portion and guiding the exhaust gas from the lower portion to the upper portion, A third discharge path for guiding the discharge gas is formed,
The heat-
And a fourth exhaust passage for guiding the exhaust gas discharged from the waste heat recovery boiler from the lower part to the upper part. The method according to claim 1,
Wherein the bubbling fluidized bed combustion furnace is provided with a discharge port at a lower portion of the gas chamber chamber, the first waste heat recovering portion, and the heat exchange portion. The method according to claim 1,
The second combustion air supply means and the third combustion air supply means
An air chamber provided inside the bubbling fluidized bed combustion furnace and having an inlet through which combustion air flows into one side and a plurality of injection holes formed in the other side;
And an injection nozzle provided at one end of each of the plurality of spray holes and the other end extending obliquely outwardly of the combustion air storage part. The method according to claim 1,
The first waste heat recovering unit
And a protective cover is further provided on one side of the first water pipe into which the exhaust gas discharged from the gas chamber chamber flows. The method according to claim 1,
Further comprising a fluid medium discharge portion provided below the bubbling fluidized bed combustion furnace,
The fluid medium discharge portion
A vibration discharge pipe arranged to face the lower portion of the bubbling fluidized bed combustion furnace and arranged obliquely in mutually opposite directions;
A vibration screen provided below the vibration discharge pipe;
And a separation conveyor installed at a lower portion of the vibration screen.

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