Note: Descriptions are shown in the official language in which they were submitted.
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APPARATUS FOR GENERATING REHEAT STEAM
TECHNICAL FIELD
The present invention relates to an apparatus for
generating reheat steam, and more particularly, to an
apparatus for supplying and generating steam and mist in the
form of reheat steam.
BACKGROUND ART
Boilers are apparatuses that transfer fuel and
combustion heat to water or the like to generate steam
having high temperature and pressure, and are used to supply
the steam to steam engines such as thermal power plants and
vessels, working and heating of various factories and the
like.
In addition, the boilers are structurally divided into
a plurality of types. Among them,
a once-through boiler
corresponding to a forced circulation boiler is a boiler of
only pipes made by bending water pipes and long pipes and is
also referred to as a forced once-through boiler. The once-
through boiler is a boiler of a type in which water is
supplied at one end of the long pipe, pumped by a pump and
is sequentially heated, evaporated and superheated on the
way, and superheated steam is sent out of the other end of
the pipe. The once-
through boiler is suitable for
generation of high pressure steam, and in particular, in the
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case of a supercritical pressure boiler, the once-through
boiler is a kind of forced circulation boiler.
Generally, when heating the liquid while keeping the
constant pressure, the temperature rises, and when reaching
a certain temperature, the liquid begins to evaporate. In
this case, even when heating the liquid again, the
temperature does not change until the entire liquid
evaporates, and the liquid and steam coexist. This is
referred to as a wet saturated vapor, and that converted
into the steam is referred to as a dry saturated vapor.
When heating the dry saturated vapor again, the temperature
of the steam rises, and this is referred to as a superheated
steam. When using this steam, it is possible to improve the
efficiency of boilers, engines and turbines.
Furthermore, the superheated steam is a high-
temperature colorless transparent gas of 0.89 C or higher
that is generated by heating steam generated by boiling the
water, without applying the pressure. Although
the heat
transfer using the air is limited to the convection heat
transfer, the superheated steam has a high thermal
efficiency by additionally performing the radiation heat
transfer and the heat transfer using a condensation heat in
addition to the convection heat transfer, and thus, the
superheated steam is very effective in cooking of food.
Further, in the case of the normal convective heat transfer,
the heat transfer rate of the superheated steam is
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approximately 10 times faster than the heated air.
Particularly, by performing the heat treatment in a low
oxygen state, it is possible to suppress the oxidation and
combustion of a heated object. Further, a
common
superheater produces steam of 183.3 00 at the time of the
pressurized pressure of 10 kg/cm3G, and usually produces
steam of 170 00 at the time of 7 to 8 kg/cm3G. Meanwhile, in
order to produce a low-pressure superheated steam, there is
a method of directly heating a primarily heated steam using
a burner, a method of indirectly heating a heat accumulation
material or the like using a heater, and a method of
performing electromagnetic induction heating.
As a steam generator for generating the superheated
steam, Korean Patent Registration No. 10-0597429 (published
in July 5, 2006) discloses an apparatus that generates a
low-pressure high-temperature superheated steam. This has
an integral construction in which a spiral superheater is
mounted inside a combustion chamber of a boiler to perform
heating and reheating using a single burner, an amount of
evaporation is 30 kg/h, a steam temperature is 541.9 C, and
a steam pressure is 0.12 kg/cm3, and a cost for producing the
steam is low. Korean
Registered Patent No. 10-0910594
(published in August 3, 2009) discloses a technique that
enhances a volume of the superheated steam by increasing the
temperature of the steam generated in the boiler.
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DISCLOSURE
TECHNICAL PROBLEM
An embodiment of the present invention is directed to
an apparatus for generating reheat steam that generates a
saturated vapor such as steam supplied from the outside or
the sprayed and atomized mist by the reheat steam having a
constant temperature through heating, and can reuse the
waste heat generated in the process of a generation of the
reheat steam.
TECHNICAL SOLUTION
According to an aspect of the present invention, there
is provided an apparatus for generating reheat steam
including: a combustion chamber that is formed with a space
portion having a specific volume and has a burner installed
at a center of an upper end of the inside; a steam chamber
which is provided with a space portion having a specific
volume around the outer circumference of the combustion
chamber, and preliminarily heats the steam or atomized mist
of a specific temperature supplied from the outside using
the heat transferred from the combustion chamber; a
plurality of steam-heating pipes which are wound inside the
combustion chamber in the form of a coil to secondarily heat
the steam or the mist supplied after being preliminarily
heated in the steam chamber into reheat steam at a specific
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temperature by means of flames generated from the burner; an
exhaust chamber which is formed at a specific volume around
the outer circumference of the steam chamber and
communicates with the combustion chamber to discharge the
exhaust gas combusted in the combustion chamber through the
gas exhaust pipe; and a heating chamber which is formed at a
specific volume around the outer circumference of the
exhaust chamber to heat the steam or air supplied from the
outside using heat transferred from the exhaust chamber. In
the steam heating pipe, a first steam heating pipe and a
second steam heating pipe with an inlet communicating with
the steam chamber and an outlet connected to the steam
discharge pipe are installed in proximate with an inner wall
surface of the combustion chamber, the second steam heating
pipe is located on the top of the first steam heating pipe
at a fixed distance, the first steam heating pipe and the
second the steam heating pipe are alternately formed in a
coil shape, a third steam heating pipe and a fourth steam
heating pipe with an inlet communicating with the steam
chamber and an outlet connected to the steam discharge pipe
are installed in proximate with the first steam heating pipe
and the second steam heating pipe, the fourth steam heating
pipe is located on the top of the third steam heating pipe
at a fixed distance, the third steam heating pipe and the
fourth the steam heating pipe are alternately formed in a
coil shape.
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Further, in the present invention, a heat insulating
material having a specific thickness may be mounted on the
outer circumference of the heating chamber for heat
insulation.
Also, in the present invention, the steam heating pipe
may be aligned and installed so that flame injected from the
burner does not come into directly contact with the steam
heating pipe.
It should be understood that different embodiments of
the invention, including those described under different
aspects of the invention, are meant to be generally
applicable to all aspects of the invention. Any embodiment
may be combined with any other embodiment unless
inappropriate. All
examples are illustrative and non-
limiting.
ADVANTAGEOUS EFFECTS
According to the present invention, there are
advantages as follows. Since it is
possible to produce a
reheat steam by primarily and secondarily heating the steam
and mist supplied from the outside by the installation
structure of a plurality of steam heating pipes, it is
possible to improve the generation efficiency of the
reheated steam. Since it is
possible to heat the sucked
steam or air using the waste heat of the combusted exhaust
gas, the secondary high-temperature steam and air can be
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produced, it is possible to save the fuel consumed in
accordance with the energy utilization of high efficiency,
in addition to the improvements in the apparatus for
generating the apparatus for generating reheat steam.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a perspective view illustrating a state of
vertically cutting an apparatus for generating reheat steam
as an embodiment according to the present invention;
FIG. 2 is a perspective view illustrating a steam
heating pipe in the apparatus for generating reheat steam
according to the present invention;
FIG. 3 is a cross-sectional view illustrating an
apparatus for generating reheat steam according to the
present invention; and
FIG. 4 is a cross-sectional view illustrating an
operation of generating the high-temperature steam and air,
using the generation and waste heat of the reheat steam in
the apparatus for generating reheat steam according to the
present invention,.
BEST MODE FOR THE INVENTION
Exemplary embodiments of the present invention will be
described below in more detail with reference to the
accompanying drawings. The present invention may, however,
be embodied in different forms and should not be construed
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as limited to the embodiments set forth herein. Rather,
these embodiments are provided so that this disclosure will
be thorough and complete, and will fully convey the scope of
the present invention to those skilled in the art.
Throughout the disclosure, like reference numerals refer to
like parts throughout the various figures and embodiments of
the present invention.
Hereinafter, an apparatus for generating reheat steam
according to the present invention will be described in
detail with reference to the attached drawings.
In FIG. 1, an apparatus 1 for generating reheat steam
according to the present invention generates water supplied
in an approximately cylindrical shape into a great capacity
of reheat steam.
A combustion chamber 10 is formed with a constant
volume of a space portion. A burner 11 is installed at the
center of the top of the combustion chamber 10. The burner
11 uses a liquid fuel or a gaseous fuel for generating
thermal energy. The burner 11 generates flame from the top
to the bottom. A steam discharge pipe 14 is connected to
the upper end of the combustion chamber 10. The center of
the lower end of the combustion chamber 10 communicates with
the exhaust chamber 15 and is formed so that exhaust gas
generated from the flame generated by the burner 11 is
discharged.
A steam chamber 13 is provided so that a space portion
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of a constant volume is formed over the outer circumference
of the combustion chamber 10, i.e., the side surface and the
lower side surface. Steam supplied from the outside via the
inlet pipe 12, i.e., saturated vapor or mist obtained by
atomizing the water is introduced into the steam chamber 13.
The steam and mist introduced into the steam chamber 13 is
primarily heated by heat transferred from the combustion
chamber 10, and is raised to a certain temperature.
A steam heating pipe 20 is placed in a coil shape from
the lower portion to the upper portion of the interior of
the combustion chamber 10. The steam
heating pipe 20
secondarily heats the steam and mist supplied after being
primarily heated from the steam chamber 13, by means of
flame generated by the burner 11, and generates the reheat
steam of constant temperature. A plurality of steam heating
pipes 20 is installed in the combustion chamber 10.
In FIG. 2, the steam heating pipes 20 are arranged
inside the combustion chamber 10 in two rows, a first steam
heating pipe 21 and a second steam heating pipe 22 are
arranged and installed sequence in proximity to the inner
wall surface of the combustion chamber 10, and a third steam
heating pipe 23 and a fourth steam heating pipe 24 are
arranged and installed in proximity to the first steam
heating pipe 21 and the second steam heating pipe 22.
In FIG. 3, each of the first steam heating pipe 21 and
the second steam heating pipe 22 is in communication with
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the steam chamber 13 through an inlet and is connected to
the steam discharge pipe 14 through an outlet. The first
steam heating pipe 21 and the second steam heating pipe 22
are installed in proximity to the inner wall surface of the
combustion chamber 10, and the first steam heating pipe 21
and the second steam heating pipe 22 are alternately
arranged and installed in a coil shape, while the second
steam heating pipe 22 is located on the top of the first
steam heating pipe 21 at a predetermined distance.
Further, each of the third steam heating pipe 23 and
the fourth steam heating pipe 24 is in communication with
the steam chamber 13 through an inlet and is connected to
the steam discharge pipe 14 through an outlet. The third
steam heating pipe 23 and the fourth steam heating pipe 24
are installed in proximity to the first steam heating pipe
21 and the second steam heating pipe 22, and the third steam
heating pipe 23 and the fourth steam heating pipe 24 are
alternately arranged and installed in a coil shape, while
the fourth steam heating pipe 24 is located on the top of
the third steam heating pipe 23 at a predetermined distance.
The third steam heating pipe 23 and the fourth steam heating
pipe 24 may be arranged and installed so that flame injected
from the burner 11 does not come into direct contact
therewith.
Although the first steam heating pipe 21 and the second
steam heating pipe 22 of the steam heating pipe 20 are
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installed in a coil shape in proximity to the inner wall
surface of the combustion chamber 10, three or more steam
heating pipes may be sequentially and alternately installed
in a coil shape. Further, although the third steam heating
pipe 23 and the fourth steam heating pipe 24 are installed
in a coil shape, three or more steam heating pipes may be
sequentially alternately installed in a coil shape.
Moreover, although each of two steam heating pipes of the
steam heating pipe 20 is installed in a coil shape inside
the combustion chamber 10 in two rows, steam heating pipes
of three or more rows may be sequentially and alternately
installed in a coil shape. Accordingly, the production
capacity of the reheat steam may vary depending on the
arrangement and number of installations of the steam heating
pipes.
Furthermore, it is also possible to adjust the
temperature of the reheat steam, depending on the
arrangement and number of installations of the steam heating
pipes.
The exhaust chamber 15 is formed on the outer
circumference of the steam chamber 13 to have a constant
volume. The exhaust chamber 15 is in communication with the
combustion chamber 10 to discharge the combustion exhaust
gas combusted in the combustion chamber 10 through the gas
discharge pipe 16. The heat of the exhaust gas discharged
through the exhaust chamber 15 heats the steam and mist
flowing into the steam chamber 13 and is also transmitted to
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the heating chamber 18.
The heating chamber 18 is formed on the outer
circumference of the exhaust chamber 15 at a constant volume.
The heating chamber 18 heats the steam or air supplied from
the outside by heat from the exhaust chamber 15, and
discharges steam or air heated to a constant temperature
through the discharge pipe 19.
Further, the heat insulating material 30 having a
constant thickness is coupled to the outer circumference of
the apparatus 1 for generating reheat steam for heat
insulation, and a housing 31 is coupled to the outside of
the heat insulating member 30.
The operation of the apparatus for generating reheat
steam according to the present invention having such a
configuration will be described.
In FIG. 4, when flame is injected by operating the
burner 11 in a state in which the steam and mist supplied
through the inflow pipe 12 of the apparatus 1 for generating
reheat steam is filled in the steam chamber 13, the steam
and mist introduced through the plurality of steam heating
pipes 20 is converted into a reheat steam. At this time,
when the steam and mist is supplied to the steam chamber 13
through the inflow pipe 12 after raising the internal
temperature of the combustion chamber 10 by operating the
burner 11, the steam and mist are primarily heated by heat
transferred from the combustion chamber 10 to the steam
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chamber 13. Further,
the gas combusted in the combustion
chamber 10 may further heat the steam and mist of the steam
chamber 13, by transmitting the waste heat to the steam
chamber 13, while being discharged from the gas discharge
pipe 16 via the exhaust chamber 15.
Furthermore, the steam and mist of the steam chamber 13
is converted into the reheat steam after being introduced
through the inlets of the first steam heating pipe 21
through the fourth steam heating pipe 24, and is discharged
into the steam discharge pipe 14 via the outlets of each
steam heating pipe 20. Therefore,
the apparatus for
generating reheat steam of the present invention may
generate and discharge a large quantity of reheat steam
through first steam heating pipe 21 through the fourth steam
heating pipe 24.
Also, the steam and air supplied to the heating chamber
18 through the supply pipe 17 of the apparatus 1 for
generating reheat steam is heated to a constant temperature
by the heat transferred from the exhaust chamber 15 and then
is discharged through the discharge pipe 19.
In this way, the combustion chamber 10 can generate the
reheat steam in the plurality of steam heating pipes 20 by
flame generated in the burner 11 and can primarily heat the
steam and mist by heat transferred to the steam chamber 13,
and the exhaust gas generated after being combusted the
combustion chamber 10 transfers heat to the steam chamber 13,
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while passing through the exhaust chamber 15, and heat is
transferred to the steam chamber 13 even in the heating
chamber 18 to heat steam and mist. Accordingly, the steam
and mist are primarily heated by heat transferred from the
combustion chamber 10 and the exhaust chamber 15 in the
steam chamber 13, and the primarily heated steam and mist
are converted into the reheat steam, while passing through
the plurality of steam heating pipes 20. The reheat steam
generated from the steam heating pipe 20 is discharged
through the steam discharge pipe 14.
Further, the steam and air introduced into the heating
chamber 18 through the supply pipe 17 are heated to the
constant temperature transmitted from the exhaust chamber 15
and are discharged via the discharge pipe 19.
Accordingly, it is possible to variously use the steam
or air of a constant temperature discharged through the
discharge pipe 19 together with the reheat steam of the
constant temperature discharged through the steam discharge
pipe 14. Further,
the gas discharged through the gas
discharge pipe 16 can be utilized as a waste heat via the
heat exchanger.
In the above description, although the present
invention has been illustrated and described in conjunction
with specific embodiments, it will be easily understood by a
person having ordinary skill in the art that various
modifications and changes can be made within a scope that
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does not depart from the spirit and regions of the present
invention as defined by the appended claims.
The apparatus for generating reheat steam according to
the present invention can improve the reheat steam
generation efficiency and can heat the sucked steam and air,
by utilizing the waste heat of the combusted exhaust gas and
the secondary high-temperature steam and air can be produced.
Thus, since it is possible to save fuel consumed in
accordance with the energy utilization of high efficiency in
addition to the improvements in the apparatus for generating
reheat steam, there is industrial applicability.
While the present invention has been described with
respect to the specific embodiments, it will be apparent to
those skilled in the art that various changes and
modifications may be made without departing from the spirit
and scope of the invention as defined in the following
claims.
