KR20170142311A - Circulating fluidized bed boiler apparatus - Google Patents

Abstract

An invention related to a circulating fluidized bed boiler (CFB) apparatus is disclosed. The circulating fluidized bed boiler apparatus of the present invention includes: a housing connected to a combustion furnace such that a flowable material of the furnace is introduced; a blocking wall portion for partitioning the inside of the housing so as to form a plurality of cooling chamber portions inside the housing; a recovery portion connecting the housing and the combustion furnace; a heat exchanger disposed in the plurality of cooling chamber portions so as to cool the flowable material; an air injecting portion for injecting air into the plurality of cooling chamber portions so as to flow the flowable material; and a layer material scattering portion disposed in the plurality of cooling chamber portions and injecting air so as to scatter the layer material among the flowable material to a side of the recovery portion.

Description

[0001] CIRCULATING FLUIDIZED BED BOILER APPARATUS [0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a circulating fluidized bed boiler apparatus, and more particularly, to a circulating fluidized bed boiler apparatus capable of reducing a temperature deviation of a furnace and reducing a loss of flowing material.

Generally, a circulating fluidized bed boiler generates thermal energy by burning fuel coal such as coal, and generates steam by using heat energy. Steam is supplied to the turbine to drive the turbine.

The circulating fluidized bed boiler includes a furnace. In the combustion furnace, as the air is injected into the fuel, the fuel burns as it flows. When the fuel is flowing, the temperature fluctuation of the furnace is reduced as the layer material is heat-exchanged with the fuel, and the particles are heat-exchanged with the fuel while circulating the smaller layer material. All solid particles in a combustion furnace are generally referred to as flow materials when the fuel is combusted and burnt, such as flowing fuel, burnt material, sand injected into the bed material, and limestone injected with a desulfurizer.

A portion of the flow material flowing below the furnace is discharged to the flow material treatment section. An air injection nozzle is installed in the fluid material processing part to inject air from the lower side of the fluid material to separate the fluid material according to the particle size while flowing the fluid material.

If the flow rate of the air injected from the air injection nozzle is too fast, the flow performance of the flow material is improved, but the flow material is difficult to separate in accordance with the particle size. Further, when the flow rate of the air ejected from the air injection nozzle is too slow, the flowing material does not flow. When the flowing material is cooled while flowing, the layer material of the fine powder having a small particle size among the flowing materials is recovered to the furnace through the return pipe. The layer materials recovered in the furnace circulate along the furnace and heat exchange with the flow material.

However, conventionally, the flow rate of the air injected from the air injection nozzle is limited within a range in which the flow material is flowed and stratified, so that the layer material recovery rate for flowing the layer material of the flow material treatment portion into the furnace may be lowered.

In addition, as the recovery rate of the layer material decreases, the layer material circulated in the combustion furnace becomes insufficient, so that heat exchange efficiency varies depending on the position of the flow material in the combustion furnace. Accordingly, as the layer material becomes insufficient in the combustion furnace, the temperature deviation of each part of the combustion furnace increases. Therefore, in order to secure the operation stability, the power generation output must be reduced or the combustion furnace must be stopped.

In addition, if the temperature deviation is increased for each part of the furnace, the flowable material may be aggregated or melted in the region of a relatively high temperature, and clinker may be generated. As the clinker is generated inside the furnace, the flowability of the flowing material is reduced, and the temperature variation can be further increased.

The background of the present invention is disclosed in Korean Patent Laid-Open Publication No. 2013-0096317 (entitled "Circulating Fluidized Bed Boiler with Two Heat Exchangers for High-Temperature Solids Flow", published on Mar. 08, 29, 201).

It is an object of the present invention to provide a circulating fluidized bed boiler apparatus capable of reducing a temperature deviation of a furnace and reducing a loss of a flowable material.

The circulating fluidized bed boiler apparatus according to the present invention comprises: a housing connected to the combustion furnace such that a flowable material of the furnace is introduced; A barrier wall part for partitioning the inside of the housing to form a plurality of cooling chamber parts inside the housing; A recovery unit connecting the housing and the combustion furnace; A heat exchanger disposed in the plurality of cooling chamber portions to cool the flow material; An air injecting portion for injecting air into the plurality of cooling chamber portions to flow the flowing material; And a layer material scattering portion disposed in the plurality of cooling chamber portions, for spraying air so as to scatter the layer material to the collection portion side among the flow materials.

The collecting part may be disposed on the upper side of the housing, and the layer material scattering part may be disposed between the heat exchanger and the collecting part.

The layer material scattering portion may scatter the layer material having a particle size of 0.1-0.5 mm toward the collecting portion side.

The layer material scattering portion may include a plurality of scattering nozzle portions disposed in each of the plurality of cooling chamber portions.

The temperature of the layer material recovered in the combustion furnace can be controlled by adjusting the air injection amount of each of the plurality of scattering nozzle units.

The layer material scattering portion may be formed with a plurality of through holes so that the flow material discharged from the combustion furnace or the cooling chamber portion can pass through.

The layer material scattering part may be formed in a net shape, and a plurality of scattering nozzle parts may be formed on the layer material scattering part to inject air toward the collecting part side.

The blocking wall portion may be formed with a flow hole portion so that the flow material of the cooling chamber portion flows to the neighboring cooling chamber portion.

The blocking wall portion may be disposed at a periphery of the flow hole portion and may include a blocking nozzle portion that blocks air from flowing through the flow hole portion by spraying air into the flow hole portion.

The flow hole portion may be disposed below the blocking wall portion.

The air jetting direction of the blocking nozzle portion may be inclined toward the outside of the flow hole portion.

The recovery unit may include a plurality of recovery tubes arranged on upper sides of the plurality of cooling chamber units.

A hopper portion may be formed on the upper side of the housing so as to be converged toward the return pipe portion to guide the scattered layer material to the return pipe portion.

The air injector may inject air at a flow rate in the range of 2.5-3 Umf.

According to the present invention, it is possible to increase the particle size range of the recovered layer material by scattering the layer material having a particle size that can not be scattered by the air layer jet scattering portion air ejection portion toward the recovery portion side.

Further, according to the present invention, since sufficient layer material is supplied to the furnace, the temperature fluctuation of the furnace can be reduced as the layer material is heat-exchanged with the flow material in the furnace. Therefore, since the combustion furnace can be operated stably, the power generation output can be reduced or the operation can be prevented from being interrupted.

Further, according to the present invention, since the temperature of the furnace can be controlled according to the temperature of the layer material recovered in the furnace, the operation stability of the furnace can be ensured.

According to the present invention, since the flow hole portion is formed in the blocking wall portion such that the flow material of the cooling chamber portion flows to the neighboring cooling chamber portion, the flow material having a large particle size can be discharged to the neighboring cooling chamber portion through the flow hole portion.

Further, according to the present invention, the blocking nozzle portion injects air into the flow hole portion to form an air curtain, so that the flowing material is blocked by the air curtain and can not pass through the flow hole portion. Therefore, the flow rate of the flowing material can be adjusted by driving and stopping the blocking nozzle portion.

1 is a view illustrating a circulating fluidized bed boiler according to an embodiment of the present invention.
FIG. 2 is a block diagram illustrating a fluid material treatment unit of a circulating fluidized bed boiler according to an embodiment of the present invention. Referring to FIG.
3 is a view showing a state in which a flowing material passes through a blocking wall in a circulating fluidized bed boiler according to an embodiment of the present invention.
4 is a plan view showing a part of a layer material scattering part in a circulating fluidized bed boiler according to an embodiment of the present invention.
5 is a side view showing a part of a layer material scattering part in a circulating fluidized bed boiler apparatus according to an embodiment of the present invention.
6 is a front view showing a blocking wall portion in a circulating fluidized bed boiler apparatus according to an embodiment of the present invention.
7 is a cross-sectional view illustrating a blocking wall portion in a circulating fluidized bed boiler apparatus according to an embodiment of the present invention.

Hereinafter, an embodiment of a circulating fluidized bed boiler according to the present invention will be described with reference to the accompanying drawings. In the course of describing the circulating fluidized bed boiler apparatus, the thicknesses of the lines and the sizes of the constituent elements shown in the drawings may be exaggerated for clarity and convenience of explanation. In addition, the terms described below are defined in consideration of the functions of the present invention, which may vary depending on the intention or custom of the user, the operator. Therefore, definitions of these terms should be made based on the contents throughout this specification.

FIG. 1 is a view showing a circulating fluidized bed boiler according to an embodiment of the present invention, FIG. 2 is a view showing a processing unit of a circulating fluidized bed boiler according to an embodiment of the present invention, FIG. 3 Is a schematic view showing a state where a flowing material passes through a blocking wall portion in a circulating fluidized bed boiler apparatus according to an embodiment of the present invention,

1 to 3, a circulating fluidized bed boiler apparatus according to an embodiment of the present invention includes a housing 110, a blocking wall portion 120, a collecting portion 130, a heat exchanger 140, an air injecting portion 150 And a layer material scattering portion 160. [

The combustion furnace 10 is connected to the cyclone 20 and the cyclone 20 is connected to the loop chamber 30 and the loop chamber 30 is connected to the lower side of the furnace 10. In the furnace 10, a fuel such as coal is burned. A wind box 15 is provided below the combustion furnace 10 to inject air to the lower side of the combustion furnace 10 and burn it. As the air is injected to the lower side of the combustion furnace 10, the fuel is combusted while flowing. Since the fuel is combusted while being flowed, the flowed fuel is hereinafter referred to as a flow material. The flow material is divided into a layer material circulated in the furnace and a solid material flowing only in the lower side of the furnace. The layer material is a material having a particle size of 0.5 mm or less so as to be scattered by the jet of air and the solid material is classified into a material having a particle size of 0.5 mm or more which is not scattered by the jet of air.

The small particle layer material in the flow material flows from the combustion furnace 10 to the cyclone 20 together with the air and the cyclone 20 separates the layer material downward and discharges the air to the stack or the waste heat recoverer . The layer material of the fine particles falling in the cyclone 20 flows into the loop chamber 30 and the layer material of the loop chamber 30 is reintroduced into the furnace 10. In the furnace 10, the bed material is circulated and heat exchanged with the solid matter of the flowing material.

A flow material treatment unit 100 is installed below the combustion furnace 10 to discharge a part of the flow material. The fluid substance treatment section 100 is connected to the combustion furnace 10 by the connection tube section 103 and the recovery section 130. The fluid material processing unit 100 includes a housing 110 having a blocking wall 120, a collecting unit 130, a heat exchanger 140, an air injecting unit 150, and a layer material scattering unit 160 to be.

The housing 110 is connected to the combustion furnace 10 so that the flowing material of the furnace 10 is introduced. The housing (110) is connected to the lower side of the furnace (10) by a connecting tube portion (103).

The blocking wall 120 defines the interior of the housing 110 to form a plurality of cooling chamber portions 111, 112, and 113 inside the housing 110. A plurality of blocking wall portions 120 are disposed inside the housing 110. The upper side of the blocking wall portion 120 is spaced from the upper side of the housing 110 by a certain distance. The flow materials separated in the cooling chamber parts 111, 112 and 113 flow into the adjacent cooling chamber parts 111, 112 and 113 beyond the upper side of the barrier wall part 120. In FIG. 2, three cooling chamber parts 111, 112 and 113 are formed by the barrier wall part 120, but the present invention is not limited thereto. The blocking wall portion 120 will be described in detail below.

The recovery unit 130 connects the housing 110 and the combustion furnace 10. The recovery unit 130 is a path for recovering the layer material of the fine particles scattered in the housing 110 to the combustion furnace 10. The layer material of the housing 110 is recovered to the combustion furnace 10 through the recovery part 130, so that the lack of the layer material in the combustion furnace 10 can be prevented.

The recovery unit 130 includes a plurality of recovery tubes 133 disposed above the plurality of cooling chamber units 111, 112, and 113, respectively. The recovery tube portion 133 corresponds one-to-one to the cooling chamber portions 111, 112, and 113. The recovery tube portion 133 is disposed at the upper center portion of the cooling chamber portions 111, 112, and 113. The flow rate and the flow rate of the air can be set differently in the plurality of cooling chamber sections 111, 112, and 113 since the recovery tube section 133 is disposed on the upper side of the cooling chamber sections 111, 112, and 113, respectively.

A hopper part 117 is formed on the upper side of the housing 110 so as to be converged toward the recovery tube part 133 so as to guide the scattered layer material to the recovery tube part 133. [ The hopper portions 117 are disposed on the upper side of the cooling chamber portions 111, 112, and 113, respectively. The hopper portion 117 is formed in a conical shape, and a return pipe portion 133 is formed at the vertex portion of the hopper portion 117. Since the hopper portion 117 directs the layer material to the recovery tube portion 133, the layer material can be recovered smoothly through the recovery tube portion 133. [ Therefore, the recovery efficiency of the layer material can be improved.

The heat exchanger 140 is disposed in the plurality of cooling chamber portions 111, 112, 113 to cool the flowing material. As the cooling medium such as water flows in the heat exchanger 140, heat exchange is performed with the flowing material. The heat exchanger 140 is formed in a zigzag shape inside the cooling chamber portions 111, 112, and 113. The temperature of the flowing material in the cooling chamber portion 111 near the combustion furnace 10 is relatively high and the temperature of the flowing material in the cooling chamber portion 111 is relatively high In the cooling chamber portion 113 to be disposed, the temperature of the flowing material is relatively low.

The air injector 150 injects air into the plurality of cooling chamber parts 111, 112, and 113 to flow the flowing material. An air supply header 155 is connected to the air injection unit 150 to supply air to the air injection unit 150. The air supply header 155 may be disposed on the lower side of the housing 110. The air injection unit 150 includes a plurality of air injection nozzles 153 disposed in the respective cooling chamber units 111, 112, and 113. The air injector 150 injects air into the flow material side. At this time, the fluid material having a relatively small particle size is moved to the upper side of the cooling chamber parts 111, 112 and 113, and the fluid material having a relatively large particle size is positioned below the cooling chamber parts 111, 112 and 113. Thus, the cooling material in each of the cooling chamber parts 111, 112, and 113 is cooled while being separated.

The air injector 150 injects air at a flow rate in the range of 2.5-3 Umf. When the air jet flow rate of the air injection portion 150 exceeds 3 Umf, the mixing of the flow material becomes too active, and the flow material becomes difficult to be separated. Also, when the air injection flow rate of the air injection unit 150 is less than 2.5 Umf, the air injection flow rate of the air injection unit 150 is too low to significantly reduce the flowability of the flow material or prevent the flow material from flowing. When the air jet flow rate of the air injection unit 150 falls within the range of 2.5-3 Umf, the fluid material is smoothly separated from the fluid material while securing fluidity of the fluid material.

The layer material scattering portion 160 is disposed in the plurality of cooling chamber portions 111, 112 and 113 and injects air to scatter the layer material having a relatively small particle size among the flowing materials toward the collection portion 130 side. Since the layer material scattering portion 160 scatters the layer material of the fine powder to the side of the collecting portion 130, the layer material can be more recovered to the furnace 10 through the collecting portion 130. This will be described in more detail.

The flow rate of the air injected from the air injecting unit 150 is limited within a certain range so that the flowing material does not mix while flowing. Therefore, the air injected from the air injecting unit 150 can flow the layer material less than about 0.1 mm into the combustion furnace 10 through the recovery unit 130. However, since the layer material scattering portion 160 does not need to flow the flowing material, the layer material having a relatively large particle size of 0.1-0.5 mm among the layer materials of the flowing material can be scattered toward the collecting portion 130 side.

Accordingly, the layer material scattering portion 160 further splashes the layer material having a particle size of 0.1-0.5 mm, which can not be scattered by the air injecting portion 150, to the side of the collecting portion 130, so that the particle size range of the recovered layer material is . In addition, it is possible to supply a sufficient amount of the layer material to the furnace 10 since the layer material having a particle size of 0.1-0.5 mm in the flow material is prevented from being discharged to the outside. Since a sufficient amount of the layer material is supplied to the furnace 10, the temperature variation of the furnace 10 can be reduced as the layer material is heat-exchanged with the flow material of the furnace 10. In addition, since the combustion furnace 10 is operated stably, it is possible to prevent the power generation output from being reduced or the shutdown to occur.

The collecting part 130 is disposed on the upper side of the housing 110 and the layer material scattering part 160 is disposed between the heat exchanger 140 and the collecting part 130. Since the layer material scattering portion 160 is disposed between the heat exchanger 140 and the collecting portion 130, the air injected from the layer material scattering portion 160 is mixed with the flow material Lt; / RTI > Thus, the layer material scattering portion 160 can increase the flow rate of the jetting air so as to scatter the layer material having a particle size of 0.1-0.5 mm, and thus can increase the recovery of the layer material in the cooling chamber portions 111, 112, 113 .

In the cooling chamber portion 113 disposed farthest from the combustion furnace 10, discharge portions 171 and 173 are formed so as to discharge sufficiently cooled flow materials to the outside. The discharge portions 171 and 173 include an upper discharge tube portion 171 disposed on the upper side of the cooling chamber portion 113 and a lower discharge tube portion 173 disposed on the lower side of the cooling chamber portion 113. The upper discharge tube portion 171 discharges the small-particle flow material located on the upper side in the cooling chamber portion 113. The lower discharge tube portion 173 discharges a large amount of the flowing material located below the cooling chamber portion 113. The flow material discharged from the cooling chamber portion 113 can be recycled.

FIG. 4 is a plan view showing a part of a bed material scattering part in a circulating fluidized bed boiler according to an embodiment of the present invention, and FIG. 5 is a schematic view showing a part of the bed material scattering part in a circulating fluidized bed boiler according to an embodiment of the present invention. FIG.

4 and 5, the layer material scattering unit 160 includes a plurality of scattering nozzle units 161 disposed in the plurality of cooling chamber units 111, 112, and 113, respectively. When three cooling chamber parts 111, 112 and 113 are formed in the housing 110, the plurality of scattering nozzle parts 161 are arranged for each of the cooling chamber parts 111, 112 and 113. The scattering nozzle unit 161 includes a plurality of scattering nozzles 161a. The scattering nozzle 161a injects air upward.

The temperature of the layer material recovered in the combustion furnace 10 is controlled by controlling the air injection amount of the plurality of scattering nozzle units 161 respectively. The temperature of the combustion furnace 10 can be adjusted in accordance with the temperature of the layer material recovered in the combustion furnace 10, so that the operation stability of the combustion furnace 10 can be secured. Specific examples of controlling the temperature of the layer material recovered in the furnace 10 are as follows.

When the high-temperature layer material is required in the furnace 10, the layer material scattering portion 160 of the cooling chamber portion 111 disposed closest to the combustion furnace 10 increases the flow rate of air to the reference flow rate. At this time, since the cooling chamber portion 111 close to the combustion furnace 10 is at the highest temperature, a relatively high amount of the bed material is supplied to the combustion furnace 10 through the recovery tube portion 133.

When the medium-temperature layer material is required in the furnace 10, the layer material scattering portion 160 of the cooling chamber portion 112 disposed at a medium distance from the combustion furnace 10 increases the flow rate of the air . Since the intermediate cooling chamber portion 112 in the combustion furnace 10 is at an intermediate temperature between the cooling chamber portions 111 and 113 on both sides of the combustion furnace 10, .

In addition, when a low-temperature layer material is required in the furnace 10, the layer material scattering portion 160 of the cooling chamber portion 113 disposed farthest from the furnace 10 increases the flow rate of air to the reference flow rate . At this time, since the cooling chamber portion 113 disposed farthest from the combustion furnace 10 is at the lowest temperature, a relatively large amount of the bed material is supplied to the combustion furnace 10 through the recovery tube portion 133. [

A plurality of through holes 163 are formed in the layer material scattering portion 160 so that the flow materials discharged from the combustion furnace 10 and neighboring cooling chamber portions 111, 112 and 113 can pass through. The flow materials supplied from the combustion furnace 10 and the neighboring cooling chamber parts 111, 112 and 113 are moved to the lower side of the cooling chamber parts 111, 112 and 113 through the layer material scattering part 160, .

A plurality of scattering nozzle units 161 are formed on the upper side of the layer material scattering unit 160 to emit air toward the collecting unit 130 side. The scattering nozzle unit 161 may be formed to have a size of 0.1 mm or less to prevent the layer material from flowing into the layer material scattering unit 160 through the scattering nozzle unit 161.

The layer material scattering part 160 is disposed in a multi-stage on the upper side of the heat exchanger 140 and the multi-stage layer material scattering part 160 is connected to the header part 165. The header portion 165 simultaneously supplies air to the plurality of layer material scattering portions 160. Since the layer material scattering portion 160 is disposed in multiple stages, it is possible to prevent the flow rate of the air injected from the layer material scattering portion 160 from decelerating in the space between the layer material scattering portion 160 and the collecting portion 130 have. Accordingly, the layer material of 0.1-0.5 mm particles is scattered and can be recovered to the combustion furnace 10 through the recovery part 130.

FIG. 6 is a front view showing a blocking wall portion in a circulating fluidized bed boiler according to an embodiment of the present invention, and FIG. 7 is a cross-sectional view illustrating a blocking wall portion in a circulating fluidized-bed boiler according to an embodiment of the present invention.

6 and 7, a flow hole portion 123 is formed in the blocking wall portion 120 so that the flow material of the cooling chamber portions 111, 112, and 113 flows into the adjacent cooling chamber portions 111, 112, and 113. The flow hole part 123 serves as a path for moving the flow material toward the neighboring cooling chamber parts 111, 112 and 113 so that the flow material flows into the cooling chamber part 111 located farthest from the cooling chamber part 111 close to the combustion furnace 10, (113). ≪ / RTI >

The flow hole portion 123 is disposed below the blocking wall portion 120. The height of the flow hole portion 123 is 0.3 m or less. At this time, large-sized flow materials are separated by air injection of the air spraying unit 150 on the lower side of the cooling chambers 111, 112, and 113, and small-sized flow materials are layered on the upper side of the cooling chamber. Accordingly, the fluid material having a large particle size flows into the adjacent cooling chamber parts 111, 112, 113 through the flow hole part 123, and the fluid material having a small particle size flows through the cooling chamber parts 111, 112, 113 adjacent to the upper side of the blocking wall part 120, . Further, since the flow hole portion 123 is disposed below the blocking wall portion 120, the fluid material having a large particle size can smoothly flow into the adjacent cooling chamber portions 111, 112, and 113 through the lower side of the blocking wall portion 120. Therefore, the discharge performance of the fluid material with a large particle size can be improved, so that the fluid material with a large particle size can prevent the flow from being delayed below the cooling chamber parts 111, 112, 113.

The blocking wall portion 120 is disposed at the periphery of the flow hole portion 123 and includes a blocking nozzle portion 125 for spraying air into the flow hole portion 123 to block the flow of the flowing material from passing through the flow hole portion 123 do. The blocking nozzle portion 125 injects air into the flow hole portion 123 to form an air curtain so that the flow material is blocked by the air curtain and can not pass through the flow hole portion 123. Therefore, the flow of the flow material can be controlled by driving and stopping the shutoff nozzle part 125.

The air jetting direction of the blocking nozzle portion 125 is formed so as to be inclined toward the outside of the flow hole portion 123. The blocking nozzle portion 125 may be arranged in a plurality of rows below the flow hole portion 123. Since the air injection direction of the blocking nozzle portion 125 is formed to be inclined, it is possible to prevent the blocking wall portion 120 from being worn by the air ejected from the blocking nozzle portion 125.

Operation of the circulating fluidized bed boiler according to one embodiment of the present invention will now be described.

In the furnace 10, fuel is burned. At this time, since the wind box 15 injects air to the lower side of the furnace 10, the fuel, which is a flow material, is combusted while flowing. Some of the flow material in the furnace 10 is discharged to the cooling chamber portion 111 closest to the furnace 10.

The air injecting section 150 is injected to the lower side of the cooling chamber sections 111, 112 and 113. The air supplied from the air injecting unit 150 cools the flowing materials of the cooling chamber parts 111, 112 and 113 while cooling them. At this time, the small-sized flow material flows to the upper side of the cooling chamber parts 111, 112, 113, and the large-size flow material is positioned below the cooling chamber parts 111, 112, 113. Therefore, the flowing material in the cooling chamber parts 111, 112, and 113 is layered by granularity.

The large-sized flow material flows into the neighboring cooling chamber portions 111, 112 and 113 through the flow hole portion 123 of the blocking wall portion 120, and the induction material of small particle size flows over the upper side of the blocking wall portion 120, 111, 112 and 113, respectively. The flow material is moved as described above to the cooling chamber portion 113 located farthest from the combustion furnace 10. And an upper discharge pipe portion 171 and a lower discharge pipe portion 173 are connected to the last cooling chamber portion 113. [ The fluid material having a large particle size is discharged through the lower discharge pipe section 173 and the fluid material having a small particle size is discharged through the upper discharge pipe section 171.

On the other hand, the fluidizing air injected from the air injecting part 150 can be obtained from the following relational expression as the minimum fluidizing velocity with respect to the average particle size of the flowing material. The minimum fluidization rate is adjusted to 2.5-3 Umf.

는 기체 점도,

는 입도 크기,

는 기체 밀도,

는 입자 밀도,

는 중력가속도이다.here,

Is the gas viscosity,

The particle size,

Is the gas density,

The particle density,

Is the gravitational acceleration.

As the air is injected from the air injecting unit 150, a small-sized flow material flows on the upper side of the cooling chamber units 111, 112, and 113, and is separated into layers. At this time, the scattering material injects air so that the layer material having a particle size of 0.1-0.5 mm is scattered toward the collecting part 130 side.

In this case, the terminal velocity of the layer material having a particle size of 0.1-0.5 mm can be obtained by the following relation in the scattering section. The air amount of the layer material scattering unit 160 is adjusted so that the sum of the amount of air injected into each of the cooling chamber units 111, 112, and 113 and the amount of air of the layer material scattering unit 160 becomes the scattering flow rate of the layer material.

,(a)

,

,(b)

,

,(c)

,

는 기체 점도,

는 입자 크기,

는 기체 밀도,

는 입자 밀도,

는 중력가속도,

는 기체 속도, Re는 레이놀즈수이다.here,

Is the gas viscosity,

The particle size,

Is the gas density,

The particle density,

Gravity acceleration,

Is the gas velocity, and Re is the Reynolds number.

The temperature of the layer material recovered in the combustion furnace 10 is controlled by controlling the air injection amount of the plurality of scattering nozzle units 161 respectively.

For example, when a high-temperature layer material is required in the furnace 10, the layer material scattering portion 160 of the cooling chamber portion 111 disposed closest to the furnace 10 can reduce the flow rate of the air . At this time, since the cooling chamber portion 111 close to the combustion furnace 10 is at the highest temperature, a relatively high amount of the bed material is supplied to the combustion furnace 10 through the recovery tube portion 133.

When the medium-temperature layer material is required in the furnace 10, the layer material scattering portion 160 of the cooling chamber portion 112 disposed at a medium distance from the combustion furnace 10 increases the flow rate of the air . Since the intermediate cooling chamber portion 112 in the combustion furnace 10 is at an intermediate temperature between the cooling chamber portions 111 and 113 on both sides of the combustion furnace 10, .

In addition, when a low-temperature layer material is required in the furnace 10, the layer material scattering portion 160 of the cooling chamber portion 113 disposed farthest from the furnace 10 increases the flow rate of air to the reference flow rate . At this time, since the cooling chamber portion 113 disposed farthest from the combustion furnace 10 is at the lowest temperature, a relatively large amount of the bed material is supplied to the combustion furnace 10 through the recovery tube portion 133. [

Since the temperature of the combustion furnace 10 can be controlled according to the temperature of the layer material recovered in the combustion furnace 10, the operation stability of the combustion furnace 10 can be secured.

As described above, since the layer material scattering unit 160 scatters the layer material having a particle size that can not be scattered by the air injecting unit 150 toward the collecting unit 130, the particle size range of the recovered layer material can be increased .

Further, since the sufficient furnace material is supplied to the furnace 10, the temperature variation of the furnace 10 can be reduced as the layer material is heat-exchanged with the flow material of the furnace 10. Therefore, since the combustion furnace 10 is operated stably, it is possible to prevent the power generation output from being reduced or the shutdown to occur.

Further, since the temperature of the combustion furnace 10 can be adjusted according to the temperature of the layer material recovered in the combustion furnace 10, the operation stability of the combustion furnace 10 can be secured.

Since the flow hole part 123 is formed in the blocking wall part 120 so that the flow material of the cooling chamber parts 111, 112 and 113 flows into the neighboring cooling chamber parts 111, 112 and 113, To the adjacent cooling chamber portions 111, 112,

Also, since the blocking nozzle portion 125 injects air into the flow hole portion 123 to form an air curtain, the flow material is blocked by the air curtain and can not pass through the flow hole portion 123. Therefore, the flow of the flow material can be controlled by driving and stopping the shutoff nozzle part 125.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. I will understand.

Accordingly, the true scope of protection of the present invention should be defined by the claims.

10: combustion furnace 15: wind box
20: Cyclone 30: Loop thread
100: fluid substance treatment section 110: housing
111, 112, 113: cooling chamber part 117: hopper part
120: blocking wall portion 123: flow-
125: shutoff nozzle unit 130:
133: Return pipe 140: Heat exchanger
150: air jetting section 153: air jet nozzle
155: air supply header 160: layer material scattering part
161: Fugitive nozzle unit 161a: Fugitive nozzle
163: through hole part 165:
171: Upper drain pipe portion 173: Lower drain pipe portion

Claims (14)

A housing connected to the combustion furnace such that a flow material of the furnace is introduced;
A barrier wall part for partitioning the inside of the housing to form a plurality of cooling chamber parts inside the housing;
A recovery unit connecting the housing and the combustion furnace;
A heat exchanger disposed in the plurality of cooling chamber portions to cool the flow material;
An air injecting portion for injecting air into the plurality of cooling chamber portions to flow the flowing material; And
And a layer material scattering portion disposed in the plurality of cooling chamber portions for spraying air so as to scatter the layer material out of the flowing material toward the recovery portion side.
The method according to claim 1,
Wherein the recovery unit is disposed on the upper side of the housing,
Wherein the bed material scattering portion is disposed between the heat exchanger and the recovery portion.
3. The method of claim 2,
Wherein the bed material scattering portion scatters the bed material having a particle size of 0.1-0.5 mm toward the collecting portion side.
3. The method of claim 2,
Wherein the layer material scattering portion includes a plurality of scattering nozzle portions disposed in each of the plurality of cooling chamber portions.
5. The method of claim 4,
Wherein the temperature of the layer material recovered in the combustion furnace is controlled by controlling the air injection amount of each of the plurality of scattering nozzle units.
3. The method of claim 2,
Wherein a plurality of through-holes are formed in the layer material scattering portion so that the flow material discharged from the combustion furnace or the cooling chamber portion can pass through.
The method according to claim 6,
The layer material scattering portion is formed in a net shape,
And a plurality of scattering nozzle portions are formed on the upper side of the layer material scattering portion so as to inject air toward the collecting portion side.
3. The method of claim 2,
Wherein the blocking wall portion is formed with a flow hole portion so that the flow material of the cooling chamber portion flows to the neighboring cooling chamber portion.
9. The method of claim 8,
Wherein the blocking wall portion is disposed at a periphery of the flow hole portion and includes a shutoff nozzle portion for spraying air into the flow hole portion to block the flow of the flow material through the flow hole portion.
10. The method of claim 9,
And the flow hole portion is disposed below the blocking wall portion.
11. The method of claim 10,
Wherein an air injection direction of the shutoff nozzle part is formed to be inclined so as to be directed to the outside of the flow hole part.
3. The method of claim 2,
Wherein the recovery unit includes a plurality of recovery tubes arranged above the plurality of cooling chamber units.
13. The method of claim 12,
Wherein a hopper portion is formed on the upper side of the housing so as to be converged toward the return pipe portion so as to guide the layer material scattered to the return pipe portion.
The method according to claim 1,
Wherein the air injector injects air at a flow rate in the range of 2.5-3 Umf.

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