Heat exchange apparatus for circulating fluidized bed boilers

Patent metadata

Field	Value
Publication number	US-2016377351-A1
Application number	US-201615192849-A
Country	US
Kind code	A1
Filing date	Jun 24, 2016
Priority date	Jun 29, 2015
Publication date	Dec 29, 2016
Grant date	—

Abstract

A heat exchange apparatus for circulating fluidized bed boilers is disclosed. The heat exchange apparatus for circulating fluidized bed boilers includes a particle separator configured to separate an exhaust gas and a flow medium discharged from a combustion furnace, an external heat exchanger into which the flow medium collected in the particle separator flows and which is configured to heat a heat transfer medium by heat exchange with the flow medium, and a flow control unit installed at the external heat exchanger and configured to supply air to a flow path of the flow medium and to regulate an internal temperature of the external heat exchanger under the control of a flow direction and a flow quantity of the flow medium.

First claim

What is claimed is:

1 . A heat exchange apparatus for circulating fluidized bed boiler, comprising:
a particle separator configured to separate an exhaust gas and a flow medium discharged from a combustion furnace; an external heat exchanger into which the flow medium collected in the particle separator flows and which is configured to heat a heat transfer medium by heat exchange with the flow medium; and a flow control unit installed at the external heat exchanger and configured to supply air to a flow path of the flow medium and to regulate an internal temperature of the external heat exchanger under the control of a flow direction and a flow quantity of the flow medium.

2 . The heat exchange apparatus of claim 1 , wherein the external heat exchanger comprises a first external heat exchanger connected to the particle separator to communicate therewith, wherein a portion of the flow medium flowing from the particle separator is heat-exchanged with the heat transfer medium, and the other portion of the flow medium passes as is.

3 . The heat exchange apparatus of claim 2 , wherein the first external heat exchanger comprises:
a first housing section; a first inlet section formed at the first housing section to communicate therewith and configured to form a channel into which the flow medium from the particle separator flows; a path chamber formed in the first housing section to communicate with the first inlet section and configured to form a channel extending to the outside of the first housing section; a first heat exchanger inlet chamber which is disposed adjacent to the path chamber and into which the flow medium which does not flow into the path chamber flows; a first heat exchange chamber which is disposed adjacent to the first heat exchanger inlet chamber and in which a first heat exchange tube in which the heat transfer medium flows is installed; and a first outlet section disposed adjacent to the first heat exchange chamber and configured to form a channel through which the flow medium having passed through the first heat exchange chamber is supplied to the combustion furnace.

4 . The heat exchange apparatus of claim 3 , wherein the first external heat exchanger comprises:
an inlet compartment wall formed between the path chamber and the first heat exchanger inlet chamber to have an open top portion; a first heat exchanger compartment wall formed between the first heat exchanger inlet chamber and the first heat exchange chamber to have an open bottom portion; and a first outlet compartment wall formed between the first heat exchange chamber and the first outlet section to have an open top portion.

5 . The heat exchange apparatus of claim 3 , wherein the flow control unit comprises:
an inlet control section configured to inject air in a direction across the path chamber and the first heat exchanger inlet chamber; a first supply control section configured to supply air to the first heat exchanger inlet chamber; and a first heat exchange control section configured to inject air in a direction in which the flow medium in the first heat exchange chamber is caused to flow upward.

6 . The heat exchange apparatus of claim 5 , wherein the inlet control section comprises:
an air injection pipe configured to inject air; and a rotary support unit configured to support the air injection pipe so that an injection direction of the air injection pipe is variable.

7 . The heat exchange apparatus of claim 5 , wherein the first supply control section comprises:
a first air inlet chamber formed at a lower portion of the first heat exchanger inlet chamber and supplied with external air; and a first air distribution plate configured to compartmentalize the first air inlet chamber and the first heat exchanger inlet chamber and having a plurality of through holes formed therein for the air to pass therethrough.

8 . The heat exchange apparatus of claim 5 , wherein the first heat exchange control section comprises:
a second air inlet chamber formed at a lower portion of the first heat exchange chamber and supplied with external air; and a second air distribution plate configured to compartmentalize the second air inlet chamber and the first heat exchange chamber and having a plurality of through holes formed therein for the air to pass therethrough.

9 . The heat exchange apparatus of claim 2 , wherein the first external heat exchanger comprises:
a 1-1 st external heat exchanger which is connected to the particle separator to communicate therewith, in which a portion of the flow medium flowing from the particle separator is heat-exchanged with the heat transfer medium and through which the other portion of the flow medium passes as is; and a 1-2 nd external heat exchanger which is connected to the 1-1 st external heat exchanger to communicate therewith, into which the flow medium having passed through the 1-1 st external heat exchanger flows and wherein the flow medium is heat-exchanged with the heat transfer medium.

10 . The heat exchange apparatus of claim 2 , wherein the external heat exchanger further comprises:
a second external heat exchanger which is installed at the first external heat exchanger to communicate therewith, into which the flow medium having passed through the first external heat exchanger flows and wherein the flow medium is heat-exchanged with the heat transfer medium.

11 . The heat exchange apparatus of claim 10 , wherein the second external heat exchanger comprises:
a second housing section; a second inlet section formed between the second housing section and the path chamber to communicate therebetween and configured to form a channel into which the flow medium from the path chamber flows; a second heat exchanger inlet chamber which is formed in the second housing section to communicate with the second inlet section and into which the flow medium having passed through the second inlet section flows; a second heat exchange chamber which is disposed adjacent to the second heat exchanger inlet chamber and in which a second heat exchange tube in which the heat transfer medium flows is installed; and a second outlet section disposed adjacent to the second heat exchange chamber and configured to form a channel through which the flow medium having passed through the second heat exchange chamber is supplied to the combustion furnace.

12 . The heat exchange apparatus of claim 11 , wherein the second external heat exchanger comprises:
a second heat exchanger compartment wall formed between the second heat exchanger inlet chamber and the second heat exchange chamber to have an open bottom portion; and a second outlet compartment wall formed between the second heat exchange chamber and the second outlet section to have an open top portion.

13 . The heat exchange apparatus of claim 11 , wherein the flow control unit comprises:
a second supply control section configured to supply air to the second heat exchanger inlet chamber; and a second heat exchange control section configured to inject air in a direction in which the flow medium in the second heat exchange chamber is caused to flow upward.

Assignees

• Korea Electric Power Corp
• Korea Southern Power Co Ltd

Inventors

• Park Kyoung Il
• Lee Tae Hee
• Kim Dong Won
• Lee Jong Min

Classifications

• F28F27/02

  for controlling the distribution of heat-exchange media between different channels ({static flow control means in header boxes F28F9/026}; arrangements of guide plates or guide vanes F28F9/22, F28F25/12) · CPC title

• F23C10/26

  combined with devices for partial reintroduction of material into the bed, e.g. after separation of agglomerated parts · CPC title

• F28D13/00 Primary

  Heat-exchange apparatus using a fluidised bed · CPC title

• F23N3/00

  Regulating air supply or draught (conjointly with fuel supply F23N1/00) · CPC title

• F23C2206/10

  Circulating fluidised bed · CPC title