Patent Application
20160273760
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.
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 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 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° C. at the time of the pressurized pressure of 10 kg/cm3G, and usually produces steam of 170° C. 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 Jul. 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 Aug. 3, 2009) discloses a technique that enhances a volume of the superheated steam by increasing the temperature of the steam generated in the boiler.
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.
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 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.
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.
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 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.
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 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
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 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
In
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 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 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
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, 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 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.
| Number | Date | Country | Kind |
|---|---|---|---|
| 10-2013-0129726 | Oct 2013 | KR | national |
| Filing Document | Filing Date | Country | Kind |
|---|---|---|---|
| PCT/KR2014/010158 | 10/28/2014 | WO | 00 |
