KR200478465Y1 - Drain pipe sealing device for circulating fluidized combustor - Google Patents

Drain pipe sealing device for circulating fluidized combustor Download PDF

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Publication number
KR200478465Y1
KR200478465Y1 KR2020150003904U KR20150003904U KR200478465Y1 KR 200478465 Y1 KR200478465 Y1 KR 200478465Y1 KR 2020150003904 U KR2020150003904 U KR 2020150003904U KR 20150003904 U KR20150003904 U KR 20150003904U KR 200478465 Y1 KR200478465 Y1 KR 200478465Y1
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KR
South Korea
Prior art keywords
discharge pipe
combustion furnace
plate
ring
hole
Prior art date
Application number
KR2020150003904U
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Korean (ko)
Inventor
이승원
백남호
Original Assignee
한국발전기술주식회사
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Priority to KR2020150003904U priority Critical patent/KR200478465Y1/en
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Publication of KR200478465Y1 publication Critical patent/KR200478465Y1/en

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN  A CARRIER GAS OR AIR 
    • F23C10/00—Fluidised bed combustion apparatus
    • F23C10/002—Fluidised bed combustion apparatus for pulverulent solid fuel
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN  A CARRIER GAS OR AIR 
    • F23C10/00—Fluidised bed combustion apparatus
    • F23C10/18—Details; Accessories
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
    • F23G5/00—Incineration of waste; Incinerator constructions; Details, accessories or control therefor
    • F23G5/30—Incineration of waste; Incinerator constructions; Details, accessories or control therefor having a fluidised bed
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
    • F23G2203/00—Furnace arrangements
    • F23G2203/50—Fluidised bed furnace

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Fluidized-Bed Combustion And Resonant Combustion (AREA)

Abstract

The outlet pipe coupling device for a circulating fluidized bed combustion furnace according to the present invention comprises a top plate and a bottom plate coupled to an upper surface and a bottom surface of a bottom plate of a circulating fluidized bed combustion furnace, A metal mesh inserted between the through hole and the discharge pipe; A refractory material filled between the through holes and the discharge pipe; An upper ring coupled to cover an upper surface of the upper plate; And a lower ring coupled to cover the bottom surface of the lower plate. The exhaust pipe coupling device for a circulating fluidized bed combustion furnace according to the present invention can prevent the refractory material filled between the bottom plate and the discharge pipe from being lost even if the discharge pipe, the upper ring, and the lower ring are thermally expanded due to progress of combustion in the combustion furnace , The space between the through hole of the combustion furnace and the discharge pipe is maintained in an airtight state, so that the bottoming material accumulated on the bottom of the combustion furnace can be prevented from being introduced into the windbox located on the lower side of the combustion furnace.

Description

TECHNICAL FIELD [0001] The present invention relates to a drain pipe sealing device for circulating fluidized bed combustors,

The present invention relates to a coupling device for mounting a discharge pipe on a bottom plate of a circulating fluidized bed combustion furnace, and more particularly to a coupling device for a circulating fluidized bed combustion furnace for preventing a refractory material filling between a bottom plate of a combustion furnace and a discharge pipe from disappearing To an outlet pipe coupling device.

Fluidized bed combustion is a method in which a solid fuel such as a fossil fuel, a biomass fuel, etc. is combusted while flowing in a furnace together with a bed material such as sand and / or ash.

By injecting the fluidizing gas into the combustion furnace, the solid fuel and the layer material are fluidized and mixed uniformly and rapidly throughout the combustion furnace. This fluidized solid fuel and layer material is burned to produce a hot combustion gas. The combustion gas thus generated is discharged from the combustion furnace together with the heated air. A mixture of the heated air and the hot combustion gas discharged from the combustion furnace (hereinafter referred to as "flue gas") is used to generate steam for driving the steam turbine.

Typically, heat exchange in a fluidized bed boiler is accomplished in a convection section through which both the furnace and the hot exhaust gas pass. The walls of the furnace include tubes joined together by fins, and liquid flowing through the tubes absorbs heat generated in the furnace.

The fluidized bed combustion method has an advantage that the combustion reaction is fast and the operating temperature is relatively low as compared with the general thermal power combustion method, so that the amount of nitrogen oxide generated is small. In addition, the circulating fluidized bed combustion system is a method in which solid particles discharged from a combustion furnace together with flue gas are separated from the flue gas and then returned to the combustion furnace. Generally, the circulating fluidized-bed boiler includes a combustion furnace, a separator connected to an exhaust port formed in the upper portion of the furnace, a return duct for circulation of the solid particles separated from the exhaust gas in the separator, And a heat exchange unit for recovering heat from the solid particles. The separator, the return duct, and the heat exchanger constitute a particle circulation system.

On the other hand, a gas supply unit for injecting the fluidizing gas to promote combustion is provided in the combustion furnace. Wherein the exhaust gas generated as the fuel is burned by using the fluidizing gas injected from the gas supply unit rises upward in the combustion furnace by convection and catches a part of the solid particles present in the combustion furnace, And is discharged from the combustion furnace. In this process, the solid particles that can not be trapped in the exhaust gas and the unburned fuel (hereinafter referred to as " bottom material ") fall by gravity and accumulate on the bottom of the combustion furnace. Such a bottom material has a problem of lowering the efficiency of the circulating fluidized bed boiler as it interferes with the operation of burning the fuel such as inhibiting the flow of the fluidizing gas injected from the gas supply unit.

In order to solve such problems, a discharge pipe for discharging the floor material is installed in the bottom plate of the combustion furnace in a penetrating manner. Hereinafter, a conventional discharge pipe coupling structure will be described in detail with reference to the accompanying drawings.

1 is a cross-sectional view showing a structure of a conventional discharge pipe coupling device for a circulating fluidized bed combustion furnace.

As shown in FIG. 1, the bottom plate 10 of the circulating fluidized bed combustion furnace is connected to the bottom of the bottom plate 10 of the furnace through a discharge pipe 20, And is discharged to the outside through the combustion furnace.

The upper plate 22 and the lower plate 26 are coupled to the upper and lower surfaces of the combustion furnace bottom plate 10 around the through hole through which the discharge pipe 20 passes, The ring 32 and the lower ring 34 are coupled in a laminated manner and the gap between the through hole of the furnace bottom plate 10 and the discharge pipe 20 is filled with the refractory 50. The upper ring 32 is coupled to the upper plate 22 by an upper bolt 24 provided on the upper plate 22 and an upper nut 42 screwed thereto and the lower ring 34 is coupled to the lower plate 26, And is coupled to the lower plate 26 by means of a lower bolt 28 provided on the lower plate 28 and a lower nut 44 screwed thereto.

In this case, when the combustion progresses in the combustion furnace, the discharge pipe 20, the upper ring 32 and the lower ring 34 thermally expand. When the thermal expansion phenomenon occurs, the refractory material 50 around the discharge pipe 20 When the refractory 50 is lost, there is a problem that the bottom material in the combustion furnace flows into the wind box (not shown) on the lower side of the combustion furnace.

KR 10-0450326 B1

The present invention has been proposed in order to solve the above problems and it is an object of the present invention to prevent the refractory material filled between the bottom plate and the discharge pipe from being lost even if the discharge pipe and the upper ring and the lower ring are thermally expanded And to prevent a phenomenon in which the bottom material accumulated on the bottom of the combustion furnace flows into the wind box, and to provide a discharge pipe coupling device for a circulating fluidized bed combustion furnace.

According to another aspect of the present invention, there is provided a discharge pipe coupling device for a circulating fluidized bed combustion furnace, comprising: a top plate and a bottom plate coupled to an upper surface and a bottom surface of a bottom plate of a combustion fluid- A metal mesh inserted between the through hole and the discharge pipe; A refractory material filled between the through holes and the discharge pipe; An upper ring coupled to cover an upper surface of the upper plate; And a lower ring coupled to cover the bottom surface of the lower plate.

The lower part of the metal net is inserted between the through hole and the discharge pipe, and the upper part is pressed between the upper plate and the upper ring.

The metal net is formed in a cylindrical shape with its longitudinal direction facing up and down. The upper part of the metal net is composed of a plurality of cut-

When the incision is bent so as to be pressed between the upper plate and the upper ring, the plurality of incisions are arranged radially about the vertical central axis of the metal net

Wherein the upper plate includes an upper bolt sequentially passing through the separable piece and the upper ring,

The incision piece and the upper ring are fixedly coupled to the upper plate by an upper nut screwed to the upper bolt.

The metal net is formed in two layers and inserted between the through-hole and the discharge pipe, and the refractory material is filled between the two-fold metal net.

And a refractory coating layer applied to cover the upper surface of the upper ring.

The exhaust pipe coupling device for a circulating fluidized bed combustion furnace according to the present invention can prevent the refractory material filled between the bottom plate and the discharge pipe from being lost even if the discharge pipe, the upper ring, and the lower ring are thermally expanded due to progress of combustion in the combustion furnace , The space between the through hole of the combustion furnace and the discharge pipe is maintained in an airtight state, so that the bottoming material accumulated on the bottom of the combustion furnace can be prevented from being introduced into the windbox located on the lower side of the combustion furnace.

1 is a cross-sectional view showing a structure of a conventional discharge pipe coupling device for a circulating fluidized bed combustion furnace.
2 is an exploded perspective view showing a structure of a discharge pipe coupling device for a circulating fluidized bed combustion furnace according to the present invention.
3 is a cross-sectional view showing a structure of a discharge pipe coupling device for a circulating fluidized bed combustion furnace according to the present invention.
4 is a perspective view showing a shape in which the upper bolt of the upper ring passes through the cut piece.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a discharge pipe coupling device for a circulating fluidized bed combustion furnace according to the present invention will be described in detail with reference to the accompanying drawings.

FIG. 2 is an exploded perspective view showing the structure of a discharge pipe coupling device for a circulating fluidized bed combustion furnace according to the present invention, and FIG. 3 is a sectional view showing the structure of a discharge pipe coupling device for a circulating fluidized bed combustion furnace according to the present invention.

In the circulating fluidized bed combustion furnace, a large amount of bottom material is generated in the combustion process. In order to prevent the bottom material from being circulated again, the bottom plate 10 of the furnace is provided with a through- Lt; / RTI > The upper end of the discharge pipe 20 is inserted into the through hole 12 formed in the bottom plate 10 of the furnace so that the through hole 12 can be smoothly inserted into the discharge pipe 20, The refractory material 500 is filled between the inner surface of the through hole 12 and the outer surface of the discharge pipe 20 so that the bottom material can not be discharged between the through hole 12 and the discharge pipe 20.

Even if the refractory material 500 is tightly filled between the through-hole 12 and the discharge pipe 20, the refractory material 500 is broken by the thermal expansion of the respective parts and is burnt downward. As a result, There may be a problem that the refractory material 500 flows into the wind box installed on the lower side of the combustion furnace through the lost part.

A discharge pipe coupling device for a circulating fluidized bed combustion furnace according to the present invention has been proposed in order to solve the above problems and has a structure in which a bottom plate (10) of a circulating fluidized bed combustion furnace A metal net 400 inserted between the through holes 12 and the discharge pipe 20 and a metal net 400 inserted between the through holes 12 and the discharge pipe 20, An upper ring 210 coupled to cover the upper surface of the upper plate 110 and a lower ring 220 coupled to cover the lower surface of the lower plate 120, There are configuration features.

That is, in the exhaust pipe coupling device for a circulating fluidized bed combustion furnace according to the present invention, the gap between the discharge pipe 20 and the through hole 12 is not filled with the refractory material 500 but the refractory material 500), the most significant feature of the configuration. Even if vibration and thermal expansion are applied between the through hole 12 and the discharge pipe 20, if the metal mesh 400 is inserted before the refractory 500 is filled, The phenomenon of breakage of the refractory material 500 is remarkably reduced, and there is an advantage that the risk of destruction of the refractory material 500 is also reduced.

Of course, when the stress or vibration due to the thermal expansion is continuously applied to the refractory 500, the refractory 500 may be partially broken. However, even if the refractory 500 is broken, The bottom portion of the through hole 12 and the discharge pipe 20 is still filled with the refractory material 500 so that the bottom portion of the through hole 12 and the discharge pipe 20 are not filled with the refractory material 500, It is possible to prevent the phenomenon of falling to the wind box through the space between the wind box and the wind box.

At this time, since the inside of the furnace rises to a very high temperature of about 820 ° C, the metal nets 400 are preferably made of a metal having a heat resistance temperature of 1000 ° C or higher (for example, SUS 310). 3, the metal net 400 is formed in two layers so that the through-hole 12 and the discharge pipe 20 are not drawn out from the gap between the through-hole 12 and the discharge pipe 20, And the refractory material 500 is preferably filled between the double-layer metal nets 400. However, the shape of the metal net 400 is not limited to the shape shown in FIG. 3, and may be variously modified.

An upper bolt 112 penetrating the upper ring 210 is formed on the upper surface of the upper plate 110 and a lower bolt 122 penetrating the lower ring 220 is formed on the lower surface of the lower plate 120 The upper and lower rings 210 and 220 are fixed to the upper and lower plates 110 and 210 by the upper and lower nuts 310 and 320 screwed to the upper bolt 112 and the lower bolt 122, 120). Since the structure in which the upper ring 210 and the lower ring 220 are coupled to the upper plate 110 and the lower plate 120 is substantially the same as the coupling structure of the conventional discharge pipe 20 shown in FIG. 1, A detailed description thereof will be omitted.

Meanwhile, when the entire metal net 400 is inserted between the through hole 12 and the discharge pipe 20, there is a possibility that the metal net 400 is drawn downward by the combustion due to stress or vibration due to thermal expansion. When the metal mesh 400 is pulled downward, the refractory 500 fixed to the metal mesh 400 is also drawn downward along with the metal mesh 400. Therefore, A problem may occur that the air flows into the wind box through the space between the ball 12 and the discharge pipe 20.

As described above, the outlet pipe coupling device for a circulating fluidized bed combustion furnace according to the present invention can be partially fastened to the bottom plate 10 of the furnace so as to prevent the metal net 400 from being pulled downward . That is, the lower part of the metal net 400 may be inserted between the through-hole 12 and the discharge pipe 20, and an upper part of the metal net 400 may be installed between the upper plate 110 and the upper ring 210 .

When the upper part of the metal net 400 is pressed between the upper plate 110 and the upper ring 210 as described above, the metal net 400 is inserted into the discharge pipe 20 and the through hole 12, The state where the metal mesh 400 and the refractory material 500 are filled is continuously maintained between the discharge pipe 20 and the through-hole 12 since the lower part inserted between the discharge pipe 20 and the through hole 12 is not drawn down.

Generally, since the discharge pipe 20 installed in the combustion furnace is formed in a cylindrical shape, the metal mesh 400 inserted between the discharge pipe 20 and the through hole 12 is also formed into a cylindrical shape. In this case, in order to press only the upper part of the metal net 400 between the upper plate 110 and the upper ring 210 as described above, the lower side of the metal net 400 extends downward, When the entire metal net 400 is formed into a cylindrical shape, it may be difficult to bend only a part of the upper side in the horizontal direction.

Accordingly, the metal net 400 is formed in a cylindrical shape with its longitudinal direction facing up and down, and the upper part (more specifically, the part pressed between the upper plate 110 and the upper ring 210) ). ≪ / RTI > As shown in FIG. 2, when the upper part of the metal net 400 is machined into a plurality of cutouts 410, the cut 410 can be more easily and reliably bent horizontally, The entire incision 410 can be brought into close contact with the upper surface of the upper plate 110. In this case, if the discrete piece 410 is provided on only one side of the upper part of the metal net 400, the metal net 400 may not be fixed so as to be balanced as a whole, It is preferable to arrange the metal net 400 in a radial shape about the central axis of the metal net 400 in the vertical direction.

Further, in order that the metal net 400 may be more stably fixed between the discharge pipe 20 and the through hole 12, a metal piece (not shown) is formed at the lower end of the metal net 400, 120 and the lower ring 220. In this case, When the upper and lower sides of the metal net 400 are coupled to the bottom plate 10, the fixing force of the metal net 400 and the refractory 500 fixed to the metal net 400 is increased, ) Can be sealed more reliably.

Since the upper plate 110, the upper ring 210, the upper bolt 112, and the upper nut 310 are all made of metal, when they are exposed to the inside of the combustion furnace, they may be damaged when they are exposed to high- There is a possibility that the solid fuel and the layer material flowing in the combustion furnace may interfere with the upper bolt 112 or the upper nut 310, resulting in an ideal combustion.

Therefore, the exhaust pipe coupling apparatus according to the present invention may further include a refractory coating layer applied to cover the upper plate 110, the upper ring 210, the upper bolt 112, and the upper nut 310. Of course, in the refractory coating layer construction, the metal mesh 400 is inserted between the discharge pipe 20 and the through hole 12, and the refractory material 500 is filled, and the upper bolt 112 and the upper nut 310 are screwed After the upper ring 210 has been fixed by the upper ring 210, as shown in FIG.

Here, the refractory coating layer is made of a refractory material used in the production of a combustion furnace. The refractory material is variously developed and commercialized as various kinds of components, and a detailed description thereof will be omitted.

4 is a perspective view showing the shape in which the upper bolt 112 of the upper ring 210 passes through the cut piece 410. FIG.

When the discrete piece 410 provided on the upper side of the metal ring is merely squeezed between the upper plate 110 and the upper ring 210 to be pressed down on the portion inserted between the discharge pipe 20 and the through hole 12, There is a possibility that the incision 410 is pulled out from between the upper plate 110 and the lower ring 220 when an external force is applied.

Therefore, in the exhaust pipe coupling apparatus according to the present invention, the upper bolt 410 provided on the upper side of the metal ring can be fixed more securely between the upper plate 110 and the upper ring 210, (112) may sequentially pass through the discrete piece (410) and the upper ring (210). When the upper bolt 112 is coupled to penetrate through the incision 410, the incision 410 is inserted into the upper bolt 112 as long as the incision 410 is not torn or the upper bolt 112 is not broken, So that it is possible to prevent the phenomenon that the incision 410 is drawn out from between the upper plate 110 and the lower ring 220. [

While the present invention has been described in detail with reference to the preferred embodiments thereof, the scope of the present invention is not limited to the specific embodiments but should be construed in accordance with the appended claims. Those skilled in the art will appreciate that many modifications and variations are possible without departing from the scope of the present invention.

10: bottom plate 20: discharge pipe
110: upper plate 112: upper bolt
120: lower plate 122: lower bolt
210: upper ring 220: lower ring
310: Upper nut 320: Lower nut
400: metal network 410:
500: Refractory

Claims (6)

An upper plate 110 and a lower plate 120 coupled to upper and lower surfaces of the bottom plate 10 of the circulating fluidized bed combustion furnace in the vicinity of the through hole 12 through which the discharge pipe 20 passes;
A metal mesh 400 inserted between the through hole 12 and the discharge pipe 20;
A refractory material (500) filled between the through hole (12) and the discharge pipe (20);
An upper ring 210 coupled to cover the upper surface of the upper plate 110;
A lower ring 220 coupled to cover the bottom surface of the lower plate 120; / RTI >
The metal net 400 is formed in two layers and inserted between the through hole 12 and the discharge pipe 20,
Wherein the refractory material (500) is filled between two layers of metal nets (400).
The method according to claim 1,
Wherein the lower part of the metal net (400) is inserted between the through hole (12) and the discharge pipe (20), and the upper part is pressed between the upper plate (110) and the upper ring Combination device for discharge pipe for combustion furnace.
The method of claim 2,
The metal net 400 is formed in a cylindrical shape with its longitudinal direction facing up and down. The upper part of the metal net 400 is composed of a plurality of discrete pieces 410,
When the discrete piece 410 is bent so as to be pressed between the upper plate 110 and the upper ring 210, the plurality of discrete pieces 410 are radially arranged about the central axis of the metal net 400 Wherein the outlet pipe coupling device for the circulating fluidized bed combustion furnace is arranged so as to form the outlet pipe connecting pipe.
The method of claim 3,
The upper plate 110 is provided with an upper bolt 112 which sequentially passes through the separable piece 410 and the upper ring 210,
Wherein the cut-away piece (410) and the upper ring (210) are fixedly coupled to the upper plate (110) by an upper nut (310) screwed to the upper bolt (112) Coupling device.
delete The method according to any one of claims 1 to 4,
Further comprising a refractory coating layer applied to cover the upper surface of the upper ring (210).
KR2020150003904U 2015-06-15 2015-06-15 Drain pipe sealing device for circulating fluidized combustor KR200478465Y1 (en)

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KR2020150003904U KR200478465Y1 (en) 2015-06-15 2015-06-15 Drain pipe sealing device for circulating fluidized combustor

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Application Number Priority Date Filing Date Title
KR2020150003904U KR200478465Y1 (en) 2015-06-15 2015-06-15 Drain pipe sealing device for circulating fluidized combustor

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114151787A (en) * 2021-12-17 2022-03-08 无锡华光环保能源集团股份有限公司 Anti-blocking slag discharging structure of circulating fluidized bed boiler
CN114151787B (en) * 2021-12-17 2024-05-31 无锡华光环保能源集团股份有限公司 Anti-blocking slag discharging structure of circulating fluidized bed boiler

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114151787A (en) * 2021-12-17 2022-03-08 无锡华光环保能源集团股份有限公司 Anti-blocking slag discharging structure of circulating fluidized bed boiler
CN114151787B (en) * 2021-12-17 2024-05-31 无锡华光环保能源集团股份有限公司 Anti-blocking slag discharging structure of circulating fluidized bed boiler

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