KR20170002231A - Heat exchange apparatus of circulating fluidized bed boiler - Google Patents

Abstract

The present invention discloses a heat exchange apparatus of a circulation fluidized bed boiler. The heat exchange apparatus of the circulation fluidized bed boiler of the present invention comprises: a particle collector for separating a fluidized medium from exhaust gas discharged from a combustion furnace; an external heat exchanger for introducing the fluidized medium collected in the particle collector and for heating the heat delivery medium by the heat exchange with the fluidized medium; and a fluidization control device installed on the external heat exchanger for controlling the inner temperature of the external heat exchanger while supplying the air to the fluidizing path of the fluidized medium and controlling the fluidized amount and the fluidizing direction of the fluidized medium.

Description

TECHNICAL FIELD [0001] The present invention relates to a heat exchange apparatus for circulating fluidized bed boilers,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat exchange apparatus for a circulating fluidized bed boiler, and more particularly, to a heat exchange apparatus for a circulating fluidized bed boiler capable of regulating the amount of a flow medium flowing into an external heat exchanger.

In the circulating fluidized bed boiler, various heat exchangers such as a water wall tube, a wing wall tube and a platen tube in the combustion furnace are applied to recover the heat of combustion of coal have. However, when the tube is located on the combustion furnace, tube corrosion due to the exhaust gas and tube wear due to the fluid medium may occur, and a technique has been developed in the direction of installing an external heat exchanger outside the combustion furnace.

The conventional circulating fluidized bed boiler having the external heat exchanger has a structure including a furnace, a cyclone, a loop seal, a control valve, and an external heat exchanger. The flow medium (sand, ash, etc.) and the flue gas in the combustion furnace flow into the cyclone in a mixed state, and in the cyclone, particles having a predetermined weight or more (hereinafter referred to as a "fluid medium") and other gases Collectively). The flue gas separated from the fluidized medium is flowed to the downstream end through a back pass, and the separated fluidized medium flows into the loop chamber, a portion thereof flows directly into the combustion furnace, And then flows into the combustion furnace after passing through the external heat exchanger.

The tubes arranged in the external heat exchanger can avoid the direct contact with the corrosive flue gas and solve the risk of corrosion and can control the flow rate of the flow medium flowing into the external heat exchanger by using the control valve, Can be controlled. Since the temperature of the steam can be independently controlled as described above, the final heat and the final heat of the power generation equipment are disposed in the external heat exchanger.

However, there is a case where the flow medium flowing into the external heat exchanger stagnates on the control valve, or the control valve is damaged by the fluid medium having a high temperature of 800 ° C or higher. As a result, not only the power generation facility can not output normal power but also the power generation facility is stopped when the damage of the control valve is severe. As a result, the cost of replacement, repair and maintenance of the control valve portion is increasing.

In addition, since the loop room and the external heat exchanger are separated and operated, not only the available space is shortened but also only one external heat exchanger is operated for one cyclone, thereby increasing the number of external heat exchangers, There is also a problem that space is constrained by sex. Therefore, there is a need for improvement.

BACKGROUND ART [0002] The background art of the present invention is disclosed in Korean Patent Registration No. 1352804 (entitled "Combustion Apparatus for a Circulating Fluidized Bed Boiler and Its Combustion Method", Registered on April 13, 2014).

It is an object of the present invention to provide a heat exchanging apparatus for a circulating fluidized bed boiler which can solve the instability of operation of a power generation facility due to a control valve and can further improve the expandability of the external heat exchanger.

A heat exchanging apparatus for a circulating fluidized bed boiler according to the present invention comprises: a particle collector for separating a flue gas discharged from a combustion furnace and a fluid medium; An external heat exchanger into which the fluid medium collected in the particle collector flows and which heats the heat transfer medium by heat exchange with the fluid medium; And a flow control device installed in the external heat exchanger and controlling the internal temperature of the external heat exchanger while supplying air to the flow path of the fluid medium and adjusting the flow direction and flow amount of the fluid medium, do.

The external heat exchanger may include a first external heat exchanger connected in communication with the particle collector, a portion of the fluid medium introduced from the particle collector exchanges heat with the heat transfer medium, and another portion of the fluid medium is passed through the first external heat exchanger; .

The first external heat exchanger may include a first housing part; A first inlet portion formed to communicate with the first housing portion and constituting a passage through which the fluid medium flows from the particle collector; A pass-through hole formed in the first housing portion so as to communicate with the first inlet portion and forming a passageway extending to the outside of the first housing portion; A first heat exchange inflow chamber disposed adjacent to the pass space and through which the fluid medium not flowing into the pass space flows; A first heat exchange chamber disposed adjacent to the first heat exchange inlet chamber and having a first heat exchange tube through which the heat transfer medium flows; And a first discharge portion disposed adjacent to the first heat exchange chamber and constituting a passage through which the fluid medium having passed through the first heat exchange chamber is supplied to the combustion furnace.

The first external heat exchanger may further include: an inlet partition wall formed so as to open at an upper portion between the pass space and the first heat exchange inlet chamber; A first heat exchange partition wall formed between the first heat exchange inlet chamber and the first heat exchange chamber so that a lower portion thereof is opened; And a first discharge compartment wall formed to be open at an upper portion between the first heat exchange chamber and the first discharge portion.

The flow control device may further include: an inflow control unit that injects air in a direction crossing the pass room and the first heat exchange inflow chamber; A first supply regulator for supplying air to the first heat exchange inlet chamber; And a first heat exchange control unit for spraying air in a direction of upward flow of the fluid medium in the first heat exchange chamber.

The inflow control unit may include: an air injection pipe for injecting air; And a rotation support device for supporting the injection direction of the air injection pipe in a variable manner.

The first supply regulating unit may include a first air inflow chamber formed in a lower portion of the first heat exchange inflow chamber and receiving external air; And a first air distribution plate partitioning the first air inlet chamber and the first heat exchange inlet chamber and forming a plurality of through holes through which the air passes.

The first heat exchange control unit may include a second air inlet chamber formed at a lower portion of the first heat exchange chamber and receiving external air; And a second air distributor partitioning the second air inlet chamber and the first heat exchange chamber and forming a plurality of through holes through which the air passes.

The first external heat exchanger is connected to the particle collecting device, and a part of the fluid medium introduced from the particle trap is heat-exchanged with the heat transfer medium, and the other part of the fluid medium is passed through the first external heat exchanger. External heat exchanger; And a first and second external heat exchangers connected to the first external heat exchanger and connected to the first external heat exchanger, and the second external heat exchanger for exchanging the fluid with the heat transfer medium .

The external heat exchanger may further include a second external heat exchanger installed to communicate with the first external heat exchanger, the second external heat exchanger for introducing the fluid medium having passed through the first external heat exchanger and for exchanging heat with the heat transfer medium .

The second external heat exchanger may include a second housing part; A second inflow portion communicating between the second housing portion and the pass space, the second inflow portion being a passage through which the flow medium flows from the pass space; A second heat exchange inflow chamber communicating with the second inflow section inside the first housing section and through which the fluid medium having passed through the second inflow section flows; A second heat exchange chamber disposed adjacent to the second heat exchange inlet chamber and having a second heat exchange tube through which the heat transfer medium flows; And a second discharge portion disposed adjacent to the second heat exchange chamber and forming a passage through which the flow medium passing through the second heat exchange chamber is supplied to the combustion furnace.

The second external heat exchanger may include a second heat exchange partition wall having a lower portion opened between the second heat exchange inlet chamber and the second heat exchange chamber; And a second discharge compartment wall formed to be open at an upper portion between the second heat exchange chamber and the second discharge portion.

The flow regulating device may further include: a second supply regulator for supplying air to the second heat exchange inlet chamber; And a second heat exchange control unit for spraying air in a direction of upward flow of the fluid medium in the second heat exchange chamber.

According to the heat exchanger of the circulating fluidized-bed boiler according to the present invention, fluidized air for flowing the fluidized medium in the flow path of the fluidized medium is supplied by using the flow control device, and the flow direction and flow amount of the fluidized medium are controlled, Temperature can be controlled.

Further, according to the present invention, the steam temperature of the heat transfer medium passing through each of the plurality of external heat exchangers can be freely controlled by controlling the amount of the flow medium flowing into each of the plurality of external heat exchangers, Can be made more stably.

Further, according to the present invention, it is possible to solve the problem of stopping and stopping generation of power generation facilities caused by clogging and damage of control valves, and thus, it is possible to operate power generation facilities more stably, Compared to the old one, which saves a lot of money, maintenance costs can be further reduced.

In addition, according to the present invention, since the external heat exchanger has a group-room integrated structure in which the existing group room is integrated, it can be applied more space-efficiently than the existing one in which the group room is separately provided, And it can be applied and combined with an evaporator, a superheater, a reheater, etc. according to the need, so that the expandability of the number and function of the external heat exchanger can be further improved.

1 is a conceptual view schematically showing a heat exchanger of a circulating fluidized bed boiler according to an embodiment of the present invention.
FIG. 2 is a conceptual view schematically showing an external heat exchanger of a heat exchange apparatus of a circulating fluidized-bed boiler according to an embodiment of the present invention.
3 is a conceptual diagram illustrating operation of the inflow control unit of the heat exchange apparatus of the circulating fluidized bed boiler according to the embodiment of the present invention.
FIG. 4 is a conceptual view schematically showing an external heat exchanger of a heat exchange apparatus of a circulating fluidized-bed boiler according to another embodiment of the present invention.
5 is a conceptual view schematically showing an external heat exchanger of a heat exchanging apparatus for a circulating fluidized bed boiler according to another embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of a heat exchanging apparatus for a circulating fluidized bed boiler according to the present invention will be described with reference to the accompanying drawings. In this process, the thicknesses of the lines and the sizes of the components 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 schematic view illustrating a heat exchanger of a circulating fluidized-bed boiler according to an embodiment of the present invention, and FIG. 2 is a schematic view of an external heat exchanger of a heat exchanging apparatus for a circulating fluidized-bed boiler according to an embodiment of the present invention FIG. 3 is a conceptual diagram illustrating operation of the inflow control unit of the heat exchange apparatus of the circulating fluidized-bed boiler according to the embodiment of the present invention.

FIG. 4 is a schematic view illustrating an external heat exchanger of a heat exchanging apparatus for a circulating fluidized-bed boiler according to another embodiment of the present invention. FIG. 5 is a schematic view illustrating an external heat exchanger of a circulating fluidized- FIG. 2 is a conceptual diagram schematically showing a heat exchanger. FIG.

1, a heat exchanging apparatus 1 for a circulating fluidized bed boiler according to an embodiment of the present invention includes a particle collector 20, an external heat exchanger 30, and a flow regulating device 40.

An air flow at a predetermined flow rate (for example, 2 to 8 m / s or the like) is constantly maintained in the combustion furnace 10 by the air supplied from the lower portion of the combustion furnace 10, Lt; / RTI > The exhaust gas and the fluid medium in the combustion furnace 10 are discharged to the particle collector 20 via the upper portion of the furnace 10. Here, in the description of the present invention, the fluid medium refers to particles of sand, a fly ash, etc. which are mixed together in the flue gas.

The particle collector 20 is a device for separating the flue gas discharged from the combustion furnace 10 from the fluidized medium. In Fig. 1, exhaust gas and fluid medium are indicated by gas and particle, respectively. The particle collector 20 is not limited to a particular structure and shape, including a cyclone, an impact separator, and the like, as long as it is capable of separating and collecting floating fluid suspended in the exhaust gas.

The external heat exchanger 30 is a device for flowing the fluid medium from the particle collector 20 and heat-exchanging the fluid with the heat transfer medium such as water or steam, that is, heating the heat transfer medium using the fluid medium. The external heat exchanger 30 is installed to communicate with the lower part of the particle collector 20 and the fluid medium settled in the particle collector 20 flows into the external heat exchanger 30 through the lower part of the particle collector 20.

The fluid medium is heated in the combustion furnace 10 at a predetermined temperature or higher (for example, 800 DEG C or higher), collected in the particle collector 20, and passed through the external heat exchanger 30, The particulate collector 20 and the external heat exchanger 30 are continuously circulated in the combustion furnace 10, the particulate trap 20, and the external heat exchanger 30, after being cooled by the heat exchange and then introduced into the combustion furnace 10 again.

The flow regulating device 40 regulates the flow direction and flow amount of the fluid medium while supplying air to the flow path of the fluid medium formed inside the external heat exchanger 30. The flow regulating device 40 is provided to supply and discharge air toward the set direction at a set position of the external heat exchanger 30 and adjusts the flow rate of the flow medium with respect to the specific flow direction by regulating the flow rate of the jet air do. By controlling the flow of the fluid medium in this way, the temperature inside the external heat exchanger 30 can be controlled by adjusting the amount of flow of the fluid medium to the external heat exchanger 30, the discharge amount, the amount of congestion, and the like.

1 and 2, an external heat exchanger 30 according to an embodiment of the present invention includes a first external heat exchanger 31 and a second external heat exchanger 32. [

The first external heat exchanger (31) is connected to the lower part of the particle collector (20) so as to be communicated. A part of the fluid medium introduced into the first external heat exchanger 31 from the particle collector 20 is heat-exchanged with the heat transfer medium in the first heat exchange tube 315a provided in the first external heat exchanger 31, And another portion of the fluid medium introduced into the first external heat exchanger 31 passes through the first external heat exchanger 31 without heat exchange with the heat transfer medium. In the description of the present invention, 'as is' means 'not heat exchanged'.

The second external heat exchanger (32) is connected to the lower portion of the first external heat exchanger (31) so as to be connected. The fluid medium that has passed through the second external heat exchanger 32 flows into the second external heat exchanger 32 and is heat-exchanged with the heat transfer medium in the second heat exchange tube 325a provided in the second external heat exchanger 32 And is supplied to the post-combustion furnace 10.

A part of the fluid medium collected in the particle collector 20 is heat-exchanged with the heat transfer medium in the first heat exchange tube 315a while passing through the first external heat exchanger 31 and the remaining part is heat exchanged with the second external heat exchanger 32 And is heat exchanged with the heat transfer medium in the second heat exchange tube 325a. That is, the fluid medium is alternately introduced into the first external heat exchanger 31 or the second external heat exchanger 32. The flow regulator 40 is used to heat the first external heat exchanger 31 in the particle collector 20, (31) or the second external heat exchanger (32) in accordance with the speed and the injection pressure, the air is blown into the first external heat exchanger (31) or the second external heat exchanger 32 can be controlled.

2, a first external heat exchanger 31 according to an embodiment of the present invention includes a first housing portion 311, a first inlet portion 312, a pass chamber 313, a first heat exchange inlet chamber And includes a first heat exchange chamber 314, a first heat exchange chamber 315, a first discharge portion 316, an inlet partition wall 317, a first heat exchange partition wall 318 and a first discharge partition wall 319. 2, the fluidized medium, the heat transfer medium, and the fluidized air for flowing the fluidized medium are indicated as particles, steam, and air, respectively.

The first housing part 311 provides a hollow box-shaped framework inside. The first inlet 312 is a part of the passage for flowing the fluid medium from the particle collector 20 to the inside of the first housing part 311 and is located between the particle collector 20 and the first housing part 311 As shown in FIG.

The pass space 313 is formed in the first inlet portion 312 so that a part of the fluid flowing into the first inlet portion 312 can pass through the first housing portion 311 as it is, It is the part that forms the passage extending outward. The pass room 313 is formed inside the first housing part 311 and communicates with the lower part of the first inlet part 312 and extends in the vertical direction.

The first heat exchange inlet chamber 314 is a space portion into which a part of the fluid medium not introduced into the pass chamber 313 flows and is disposed adjacent to the pass chamber 313 in the first housing portion 311. A part of the flow medium flowing into the first inlet 312 flows into the first heat exchange inlet chamber 314 and the remaining part flows into the second external heat exchanger 32 through the pass chamber 313. [

The first heat exchange chamber 315 is a space portion in which the first heat exchange tube 315a is installed and is disposed adjacent to the first heat exchange inlet chamber 314. [ The flow medium flowing into the first heat exchange inlet chamber 314 is heat-exchanged with the heat transfer medium in the first heat exchange tube 315a while passing through the first heat exchange chamber 315.

The first discharge portion 316 is a portion constituting a passage for supplying and circulating the fluid medium having passed through the first heat exchange chamber 315 to the combustion furnace 10. The first discharge portion 316 is disposed adjacent to the first heat exchange chamber 315 and extends toward the combustion furnace 10 side. The fluid medium in the first heat exchange chamber 315 is discharged to the outside of the first housing portion 311 through the first discharge portion 316 and is discharged through the first discharge portion 316 to the lower portion of the combustion furnace 10 .

The inlet partition wall 317 is vertically extended between the pass space 313 and the first heat exchange inlet chamber 314 and is formed to be open at the top. The first heat exchange partition wall 318 is formed to extend vertically between the first heat exchange inlet chamber 314 and the first heat exchange chamber 315 and has a lower opening. The first discharge compartment wall 319 is installed to extend vertically between the first heat exchange chamber 315 and the first discharge portion 316,

2, the first inlet 312 is formed in the upper right portion of the first housing portion 311 and the inlet partition wall 317 is formed in the upper portion of the first housing portion 311 And is disposed apart from the right end. The first heat exchange partition wall 318 is disposed apart from the right side of the inlet partition wall 317 and the first exhaust partition wall 319 is formed at the left end of the first housing portion 311.

A passageway 313 is formed between the inlet partition wall 317 and the right end portion of the first housing portion 311. A first heat exchange inlet 311 is formed between the inlet partition wall 317 and the first heat exchange partition wall 318, A seal 314 is formed. A first heat exchange chamber (315) is formed between the first heat exchange partition wall (318) and the first discharge partition wall (319).

According to the above-described structure, the pass room 313 and the first heat exchange inflow chamber 314 are disposed in the lower portion of the first inflow portion 312. The passageway 313 and the first heat exchange inlet chamber 314 are communicatively connected to each other through an opened upper portion of the first inlet partition wall 317 and communicate with the first heat exchange inlet chamber 314 and the first heat exchange inlet chamber 314, The first heat exchange chamber 315 and the first discharge portion 316 are connected to each other through the opened lower portion of the first heat exchange partition wall 318 so that the first heat exchange chamber 315 and the first discharge portion 316 are opened Through the upper part of the body.

2, the second external heat exchanger 32 according to an embodiment of the present invention includes a second housing portion 321, a second inlet portion 322, a second heat exchange inlet chamber 324, And is communicatively connected to the lower portion of the first external heat exchanger 31, including a heat exchange chamber 325, a second discharge portion 326, a second heat exchange partition wall 328, and a second discharge partition wall 329 .

The second housing portion 321, the second inlet portion 322, the second heat exchange inlet chamber 324, the second heat exchange chamber 325, the second outlet portion 326, The second heat exchange partition wall 328 and the second discharge partition wall 329 are respectively connected to the first housing portion 311, the first inlet portion 312, the first heat exchange inlet chamber 314, the first heat exchange chamber 315, the first discharge portion 316, the first heat exchange partition wall 318 and the first discharge partition wall 319, A detailed description thereof will be omitted.

The second inflow portion 322 is a portion constituting a passage through which the flow medium introduced into the pass space 313 flows into the second housing portion 321 and flows between the second housing portion 321 and the pass room 313 As shown in FIG. The second heat exchange inlet chamber 324 is a portion through which the flow medium having passed through the second inlet portion 322 flows and is formed below the second inlet portion 322 of the interior of the first housing portion 311.

The second heat exchange chamber 325 is a space portion in which the second heat exchange tube 325a is installed and is disposed adjacent to the second heat exchange inlet chamber 324. [ The second discharge portion 326 is a portion constituting a passage through which the fluid medium having passed through the second heat exchange chamber 325 is moved and supplied to the lower portion of the combustion furnace 10 and is disposed adjacent to the second heat exchange chamber 325 do.

The second heat exchange partition wall 328 is formed so as to be open at the bottom between the second heat exchange inlet chamber 324 and the second heat exchange chamber 325. The second discharge compartment wall 329 is formed so as to open at an upper portion between the second heat exchange chamber 325 and the second discharge portion 326.

The second heat exchange inlet chamber 324 and the second heat exchange chamber 325 are communicatively connected to each other through the opened lower portion of the second heat exchange partition wall 328 and the second heat exchange chamber 325 and the second discharge portion 326 are communicatively connected through the open top of the second venting partition wall 329. [

Referring to FIGS. 1 and 2, a flow regulating device 40 according to an embodiment of the present invention includes a first flow regulating device 41 and a second flow regulating device 42.

The first flow regulator (41) is an air injector installed in the first external heat exchanger (31) to regulate the flow of the fluid medium passing through the first external heat exchanger (31). The second flow regulator 42 is an air injector installed in the second external heat exchanger 32 to regulate the flow of the flow medium through the second external heat exchanger 32.

Referring to FIG. 2, the first flow regulating device 41 according to an embodiment of the present invention includes an inlet regulator 411, a first supply regulator 414, and a first heat exchanger regulator 417 .

The inflow adjusting portion 411 injects air in a direction crossing the path seal 313 and the first heat exchange inflow chamber 314 through an opening formed in the upper portion of the inflow partition wall 317. The inflow adjusting section 411 is provided on the right end of the first housing section 311 in contact with the pass room 313 and injects air in a left direction through an opening formed in the upper part of the inflow partition wall 317 . Referring to FIGS. 2 and 3, the inflow control unit 411 includes an air injection pipe 412 and a rotation support device 413 according to an embodiment of the present invention.

The air injection pipe 412 is a nozzle device for supplying and spraying air in the first housing part 311 in a direction crossing the pass room 313 and the first heat exchange inflow chamber 314. The air injection tube 412 according to an embodiment of the present invention is installed to face the left side on the right end portion of the first housing portion 311 in contact with the pass room 313. [ The air injection pipe 412 may have a structure in which a plurality of pipes are disposed side by side in parallel or coaxially arranged, and the air flow rate on a plurality of injection paths partitioned by the plurality of pipes is individually increased Can be adjusted.

Referring to FIG. 3, the rotation support device 413 supports the air injection tube 412 so as to be capable of varying the vertical direction. The rotation support device 413 according to an embodiment of the present invention includes a hinge shaft for rotatably supporting one end of the air injection pipe 412 facing the first housing part 311, And an arc-shaped guide portion for guiding movement of the movable shaft in the up-and-down direction. However, the pivotal motion support device 413 according to the present invention is not limited to this, 412 are variable so as not to be limited to a specific structure and shape.

3 (a), 3 (b), and 3 (c), the angle of the air injection pipe 412 is adjusted in various ways, so that the first heat exchange partition wall 318 , Compared with the case where the fluid medium is pushed against the air injected from the air injection pipe 412 and intensively impacts on a specific region of the first heat exchange partition wall 318, The wear and damage of the first heat exchange partition wall 318 due to the collision with the fluid medium can be further reduced.

At this time, the air injection pipe 412 is connected to the first housing part 311 through a flexible connecting member 412a which can be deformed in length or shape like a flexible pipe. Accordingly, even when the angle of the air injection pipe 412 varies as described above, air can be stably supplied toward the inside of the first housing part 311 without interfering with the fluid medium outside the first housing part 311 As shown in FIG.

The first feed regulator 414 is operatively connected to the first heat exchange inlet chamber 314 to allow the fluid medium to be suspended in the air on the first heat exchange inlet chamber 314, . Referring to FIG. 2, the first supply controller 414 according to an embodiment of the present invention includes a first air inlet chamber 415 and a first air distributor plate 416.

The first air inflow chamber 415 is formed in the lower portion of the first heat exchange inflow chamber 314 and receives air from the outside. The first air distribution plate 416 is provided to divide the first air inflow chamber 415 and the first heat exchange inflow chamber 314 by having a plurality of through holes through which air can pass. The first air distribution plate 416 according to an embodiment of the present invention is disposed in the first heat exchange chamber 314 so as not to impede the lateral flow of the flow medium from the first heat exchange inlet chamber 314 to the first heat exchange chamber 315, 315, respectively.

The air introduced into the first air inflow chamber 415 is uniformly diffused in the first air inflow chamber 415 and then flows through the plurality of through holes formed in the first air dispersion plate 416 into the first heat exchange inflow chamber 314). Accordingly, the first supply regulating portion 414 can supply air at a uniform pressure and speed over the entire lower portion of the first heat exchange inflow chamber 314. [

The first heat exchange regulator 417 is a device for spraying air in a direction to flow upward the flow medium in the first heat exchange chamber 315. The fluid medium in the first heat exchange chamber 315 flows upward by the air injected from the first heat exchange regulator 417 and is heat-exchanged with the heat transfer medium on the first heat exchange tube 315a, 319 to the first discharge portion 316 side. Referring to FIG. 2, the first heat exchange control unit 417 according to an embodiment of the present invention includes a second air inlet chamber 418 and a second air distributor plate 419.

The second air inflow chamber 418 is formed in the lower portion of the first heat exchange chamber 315, and receives air from the outside. The second air dispersion plate 419 is provided to partition the second air inflow chamber 418 and the first heat exchange chamber 315 with a plurality of through holes through which air can pass.

The air introduced into the second air inflow chamber 418 is uniformly diffused in the second air inflow chamber 418 and is then diffused uniformly through the plurality of through holes formed in the second air dispersion plate 419 to form the first heat exchange chamber 315 ). Thus, according to the first heat exchange control unit 417, air can be supplied at a uniform pressure and speed throughout the lower portion of the first heat exchange chamber 315.

2, the second flow regulating device 42 according to an embodiment of the present invention includes a second supply regulating portion 424 and a second heat exchange regulating portion 427, 32).

The second feed regulating portion 424 and the second heat exchanging regulating portion 427 of the second flow regulating device 42 are respectively connected to the first feed regulating portion 414 of the first flow regulating device 41, (417), detailed description of the overlapped portions will be omitted.

The second supply regulator 424 supplies air to the second heat exchange inflow chamber 324 to fluidize the fluid medium within the second heat exchange inflow chamber 324. The second heat exchange control unit 427 supplies air to the lower portion of the second heat exchange chamber 325 so as to upward flow the fluid medium in the second heat exchange chamber 325.

The first external heat exchanger 31 according to an embodiment of the present invention having the above-described structure includes a passageway 313, a first heat exchange inlet chamber 314, a first heat exchange And the second external heat exchanger 32 is divided into a second heat exchange inflow chamber 324, a second heat exchange chamber 325, a second heat exchange chamber 325, And is divided into three sections corresponding to the discharge portion 326.

The first external heat exchanger 31 and the second external heat exchanger 32 are connected to communicate with each other by the pass chamber 313 so that the fluid medium collected by the particle collector 20 flows through the first external heat exchanger 31 Can be divided and introduced into the second external heat exchanger (32) at the same time. The high temperature fluidized medium flowing into the first external heat exchanger 31 is divided into the pass room 313 and the first heat exchange inflow chamber 314 by the injection air of the inflow control unit 411.

The flow medium introduced into the first heat exchange inlet chamber 314 is fluidized by the air supplied from the first supply regulator 414 and is transferred to the first heat exchange chamber 315. At this time, the first heat exchange inflow chamber 314 serves as a buffer space for temporarily storing, distributing and buffering the fluid medium, that is, serving as a conventional lab room. Exchanged with the heat transfer medium in the first heat exchange tube 315a by the air injected from the first heat exchange regulator 417 disposed in the first heat exchange chamber 315, (10).

The flow medium introduced into the second heat exchange inlet chamber 324 of the second external heat exchanger 32 via the pass room 313 is fluidized by the air supplied from the second supply regulator 424, And is moved to the chamber 325. Exchanged with the heat transfer medium in the second heat exchange tube 325a by the air injected from the second heat exchange regulator 427 disposed in the second heat exchange chamber 325, (10).

As described above, the amount of the flow medium flowing into the first and second external heat exchangers 31 and 32 is regulated by the flow regulator 411, the first heat exchange regulator 417) and the velocity (flow rate) of the air injected from the second heat exchange regulator 427. Accordingly, by regulating the speed of the air injected from the inflow controlling unit 411, the first heat exchanging control unit 417, and the second heat exchanging control unit 427, the first external heat exchanger 31, The amount of the flowing medium flowing into the unit 32, in particular, the relative flow rate (hereinafter, referred to as " ratio of the flowing medium ") can be controlled.

The table below shows a case where the pass room 313 of the first external heat exchanger 31, the first heat exchange inlet chamber 314, the first heat exchange chamber 315 and the first outlet portion 316 are 1: 2: 3: 1, and the first housing part 311 has a longitudinal width ratio corresponding to 5. The results are summarized as follows. The second heat exchange inflow chamber 324, the second heat exchange chamber 325 and the second discharge portion 326 of the second external heat exchanger 32 are respectively arranged at a width ratio of 2: 4: 1, (321) at room temperature under the condition of the vertical width ratio corresponding to 5. In order to confirm the influence of each variable, all the remaining variables were fixed when one variable was adjusted, and the amount of the fluid medium was represented by the ratio of the flow medium flowing into the first external heat exchanger (31) and the second external heat exchanger (32) .

The inflow control unit
Injection speed (m / s)
Flow medium ratio

The first heat exchanger

The second heat exchanger
2

0.19
0.81
4

0.22
0.78
6

0.3
0.7
8

0.42
0.58

The first heat exchange regulator
Injection speed (m / s)
Flow medium ratio

The first heat exchanger

The second heat exchanger
0.3

0.2
0.8
0.5

0.4
0.6
0.7

0.7
0.3
0.9

0.85
0.15

The second heat exchange regulator
Injection speed (m / s)
Flow medium ratio

The first heat exchanger

The second heat exchanger
0.3

0.4
0.6
0.5

0.2
0.8
0.7

0.15
0.85
0.9

0.05
0.95

From the table above, it is confirmed that the inflow amount of the flowing medium to the first external heat exchanger 31 and the second external heat exchanger 32 can be adjusted by controlling the speed of the air supplied and injected from the flow regulating device 40 . That is, by regulating the speed of the air supplied and discharged from the flow regulating device 40, a separate valve device corresponding to the control valve previously installed together with the group room is not used, and the first external heat exchanger 31 The amount of heat absorbed by the heat transfer medium passing through the first external heat exchanger 31 and the second external heat exchanger 32 in accordance with the target value is adjusted to the amount of heat absorbed by the second external heat exchanger 32 Control the final temperature of the heat transfer medium entering the turbine of the power plant.

Since the heat transfer medium in the first heat exchange tube 315a and the second heat exchange tube 325a can be heated to a higher temperature and a higher pressure as the flow medium flows in a larger amount, the flow regulator 411, the first heat exchange regulator The ratio of the flow medium flowing into the first external heat exchanger 31 and the second external heat exchanger 32 can be adjusted by controlling the speed of the air injected from the second heat exchange regulator 427 . Also, the first heat exchange tube 315a and the second heat exchange tube 325a may be selectively applied to the evaporator, the superheater, the reheater, or the like depending on the amount of heat absorption.

 In addition, the heat absorption area of each of the evaporator, the superheater, and the reheater varies depending on whether the subcritical pressure is applied to the boiler or the supercritical pressure. According to the present invention, the heat absorption area of the evaporator, superheater, The amount of heat absorbed by each of the evaporator, the superheater, and the reheater can be adjusted as needed by adjusting the amount of the flow medium flowing into the first external heat exchanger 31 and the second external heat exchanger 32, It can be simply varied.

4, the external heat exchanger 30 according to another embodiment of the present invention includes a first external heat exchanger 31A including a first external heat exchanger 31A and a second external heat exchanger 31B, (31).

The 1-1 external heat exchanger 31A has the same structure as the first external heat exchanger 31 according to the embodiment of the present invention shown in FIG. The first external heat exchanger 31A is connected to the particle collector 20 so that a part of the fluid medium introduced from the particle collector 20 exchanges heat with the heat transfer medium, 313).

The first and second external heat exchangers 31B and 31B have the same structure as the first external heat exchanger 31A and are connected in series below the first external heat exchanger 31B and the second external heat exchanger 32 is connected to the lower side thereof in series . The first-second external heat exchanger 31B is connected to the first-first external heat exchanger 31A so as to communicate with the first external heat exchanger 31A, A part of the medium exchanges heat with the heat transfer medium, and the other part of the fluid medium passes through the second external heat exchanger 32 side.

According to the external heat exchanger 30 according to the embodiment of the present invention, a plurality of external heat exchangers 31 corresponding to the first external heat exchanger 31 and the second external heat exchanger 32 are provided for one particle collector 20, So that the expandability of the external heat exchanger can be further improved. When three or more external heat exchangers 30 are required, a plurality of first external heat exchangers 31 are connected in series in the vertical direction as in the other embodiment of the present invention shown in FIG. .

In addition, the present invention is not limited to the application of a plurality of external heat exchangers (30), as long as it can regulate the flow of the fluidized medium while supplying and spraying air on the flow path of the fluidized medium, The present invention is also applicable to the case where only one external heat exchanger 30 corresponding to the first external heat exchanger 31 is applied.

According to the heat exchanging apparatus 1 of the circulating fluidized bed boiler according to the present invention having the above configuration, the flow regulating device 40 is used to supply the fluidized air for flowing the fluidized medium to the flow path of the fluidized medium, The internal temperature of the external heat exchanger 30 can be controlled while adjusting the flow direction and flow amount.

According to the present invention, it is possible to freely control the steam temperature of the heat transfer medium passing through each of the plurality of external heat exchangers (30) by adjusting the amount of the flow medium flowing into each of the plurality of external heat exchangers Therefore, the operation of the power generation facility can be more stably performed.

Further, according to the present invention, it is possible to solve the problem of stopping and stopping generation of power generation facilities caused by clogging and damage of control valves, and thus, it is possible to operate power generation facilities more stably, Compared to the old one, which saves a lot of money, maintenance costs can be further reduced.

In addition, according to the present invention, since the external heat exchanger (30) has a group-room integrated structure that integrates a conventional group room, it can be applied more space- It is possible to operate two or more external heat exchangers 30 with respect to the external heat exchanger 30 and to apply and combine them with an evaporator, a superheater, .

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 technical scope of the present invention should be defined by the following claims.

1: heat exchanger of circulating fluidized bed boiler 10:
20: Particulate collector 30: External heat exchanger
31: first external heat exchanger 31A: first external heat exchanger
31B: 1-2 external heat exchanger 32: second external heat exchanger
40: flow regulating device 41: first flow regulating device
42: second flow regulating device 311: first housing part
312: first inlet portion 313:
314: first heat exchange inflow chamber 315: first heat exchange chamber
315a: first heat exchange tube 316: first discharge section
317: inlet compartment wall 318: first heat exchange compartment wall
319: first discharge compartment wall 321: second housing part
322: second inlet portion 324: second heat exchange inlet chamber
325: second heat exchange chamber 325a: second heat exchange tube
326: second discharge portion 328: second heat exchange partition wall
329: second discharge compartment wall 411: inflow control section
412: air blowing pipe 413: rotation supporting device
414: first supply regulator 415: first air inflow chamber
416: first air dispersion plate 417: first heat exchange regulator
418: second air inlet chamber 419: second air distributor plate
424: second supply regulator 427: second heat exchange regulator

Claims (13)

A particle collector for separating the flue gas discharged from the combustion furnace and the fluid medium;
An external heat exchanger into which the fluid medium collected in the particle collector flows and which heats the heat transfer medium by heat exchange with the fluid medium; And
And a flow control device installed in the external heat exchanger and controlling the internal temperature of the external heat exchanger while supplying air to the flow path of the fluid medium and adjusting the flow direction and flow amount of the fluid medium, Heat exchanger of circulating fluidized bed boiler.
The method according to claim 1,
The external heat exchanger
And a first external heat exchanger connected in communication with the particle collector, wherein a part of the fluid medium introduced from the particle collector exchanges heat with the heat transfer medium, and the other part of the fluid medium is passed through as it is Heat exchanger of circulating fluidized bed boiler.
3. The method of claim 2,
Wherein the first external heat exchanger includes:
A first housing part;
A first inlet portion formed to communicate with the first housing portion and constituting a passage through which the fluid medium flows from the particle collector;
A pass-through hole formed in the first housing portion so as to communicate with the first inlet portion and forming a passageway extending to the outside of the first housing portion;
A first heat exchange inflow chamber disposed adjacent to the pass space and through which the fluid medium not flowing into the pass space flows;
A first heat exchange chamber disposed adjacent to the first heat exchange inlet chamber and having a first heat exchange tube through which the heat transfer medium flows; And
And a first discharge portion disposed adjacent to the first heat exchange chamber and serving as a passage through which the fluid medium having passed through the first heat exchange chamber is supplied to the combustion furnace.
The method of claim 3,
Wherein the first external heat exchanger includes:
An inlet partition wall formed so as to open at an upper portion between the pass space and the first heat exchange inlet chamber;
A first heat exchange partition wall formed between the first heat exchange inlet chamber and the first heat exchange chamber so that a lower portion thereof is opened; And
And a first discharge compartment wall formed to be open at an upper portion between the first heat exchange chamber and the first discharge portion.
The method according to claim 3 or 4,
The flow regulating device comprises:
An inflow adjusting part for injecting air in a direction crossing the pass room and the first heat exchange inflow chamber;
A first supply regulator for supplying air to the first heat exchange inlet chamber; And
And a first heat exchange regulator for spraying air in a direction of upward flow of the fluid medium in the first heat exchange chamber.
6. The method of claim 5,
Wherein the inflow control unit comprises:
An air injection tube for injecting air; And
And a rotation support device for supporting the injection direction of the air injection pipe so as to be variable.
6. The method of claim 5,
Wherein the first supply regulator includes:
A first air inflow chamber formed at a lower portion of the first heat exchange inflow chamber and supplied with outside air; And
And a first air distribution plate partitioning the first air inlet chamber and the first heat exchange inlet chamber and forming a plurality of through holes through which air flows.
6. The method of claim 5,
Wherein the first heat exchange regulator comprises:
A second air inlet chamber formed at a lower portion of the first heat exchange chamber and supplied with outside air; And
And a second air distribution plate partitioning the second air inlet chamber and the first heat exchange chamber and forming a plurality of through holes through which the air passes.
3. The method of claim 2,
Wherein the first external heat exchanger includes:
A 1-1 external heat exchanger connected in communication with the particle collector, a part of the fluid medium introduced from the particle collector exchanges heat with the heat carrier medium, and the other part of the fluid medium is passed therethrough; And
And a first and second external heat exchangers connected to the first external heat exchanger and flowing the first and second external heat exchangers through the first external heat exchanger and exchanging heat with the first and second external heat exchangers, Wherein the heat exchanger is a heat exchanger of a circulating fluidized bed boiler.
10. The method according to claim 2 or 9,
The external heat exchanger
And a second external heat exchanger installed in communication with the first external heat exchanger and flowing the fluid medium having passed through the first external heat exchanger and exchanging the fluid with the heat transfer medium, Heat exchanger of fluidized bed boiler.
11. The method of claim 10,
The second external heat exchanger
A second housing part;
A second inflow portion communicating between the second housing portion and the pass space, the second inflow portion being a passage through which the flow medium flows from the pass space;
A second heat exchange inflow chamber communicating with the second inflow section inside the first housing section and through which the fluid medium having passed through the second inflow section flows;
A second heat exchange chamber disposed adjacent to the second heat exchange inlet chamber and having a second heat exchange tube through which the heat transfer medium flows; And
And a second discharge portion disposed adjacent to the second heat exchange chamber and constituting a passage through which the fluid medium having passed through the second heat exchange chamber is supplied to the combustion furnace.
12. The method of claim 11,
The second external heat exchanger
A second heat exchange partition wall formed between the second heat exchange inlet chamber and the second heat exchange chamber so that a lower portion thereof is opened; And
And a second discharge compartment wall having an upper portion opened between the second heat exchange chamber and the second discharge portion.
13. The method according to claim 11 or 12,
The flow regulating device comprises:
A second supply regulator for supplying air to the second heat exchange inlet chamber; And
And a second heat exchange control unit for spraying air in a direction of upward flow of the fluid medium in the second heat exchange chamber.

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