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KR-102962698-B1 - EQUIPMENT FOR REMOVAL IRON OXIDE USING INERTIAL AND CENTRIFUGAL COMBINED FORCE IN HRSG

KR102962698B1KR 102962698 B1KR102962698 B1KR 102962698B1KR-102962698-B1

Abstract

The present invention relates to an HRSG iron oxide removal device using a combined inertial and centrifugal force method, which enables the easy capture of iron oxides contained in exhaust gas discharged from a heat recovery steam generator (HRSG). To this end, the present invention provides an HRSG iron oxide removal device of a combined inertial force and centrifugal force method, wherein an inlet duct is connected to the chimney below a chimney damper mounted within the chimney of a heat recovery boiler (HRSG), and an outlet duct is connected to the chimney above the chimney damper; a separation housing having a "U"-shaped passage formed inside is installed between the inlet duct and the outlet duct; and a plurality of metal filters are installed at the boundary of the "U"-shaped passage of the separation housing, thereby capturing iron oxides contained in the exhaust gas by the metal filters due to the inertial force and centrifugal force when the exhaust gas discharged from the heat recovery boiler (HRSG) passes through the "U"-shaped passage via the inlet duct.

Inventors

  • 박진배

Dates

Publication Date
20260511
Application Date
20231223

Claims (9)

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  2. A chimney (11) of a heat recovery boiler; a chimney damper (12) mounted within the chimney (11) so as to be openable and closable; an inlet duct (21) connected to the chimney (11) below the chimney damper (12) so as to be connected and arranged in an up-and-down direction; an outlet duct (22) connected to the chimney (11) above the chimney damper (12) so as to be connected and arranged in an up-and-down direction; a separation housing (30) formed such that an inlet section (31) connected to the lower end of the inlet duct (21) and an outlet section (32) connected to the lower end of the outlet duct (22) form a "U" shaped passage (33) and are connected to each other; and a perforated plate (40) mounted on the lower part of the inlet section (31) and the outlet section (32) inside the separation housing (30). In an HRSG iron oxide removal device comprising: a plurality of metal filters (50) mounted vertically on the porous plate (40) and arranged in a predetermined arrangement between the inlet section (31) and the outlet section (32); and a collection housing (60) of a predetermined space formed below the porous plate (40) inside the separation housing (30), An HRSG iron oxide removal device of a combined inertial force and centrifugal force type, characterized in that when exhaust gas discharged from the chimney (11) of the above-mentioned heat recovery boiler passes through the inlet duct (21) and the "U"-shaped passage (33) between the inlet (31) and the outlet (32) of the separation housing (30), iron oxide contained in the exhaust gas comes into contact with and is collected on the surface of the metal filter (50) by inertial force and centrifugal force, and the remaining exhaust gas is discharged to the chimney (11) through the outlet duct (22).
  3. In claim 2, HRSG iron oxide removal device of a combined inertial force and centrifugal force type, characterized in that the upper space of each metal filter (50) is open while the lower part of each metal filter (50) is supported on the porous plate (40), or the upper space between each metal filter (50) is closed by attaching a metal filter cover plate (35), which extends horizontally from the lower part of the central partition (34) separating the inlet part (31) and the outlet part (32), to the upper part of each metal filter (50).
  4. In claim 3, HRSG iron oxide removal device of the inertial force and centrifugal force combination method, characterized in that the upper portions of the plurality of metal filters (50) are supported on the cover plate (35), and the lower portions of each metal filter (50) further have metal filter extensions (54) formed therein, which are arranged to pass through the porous plate (40) and be close to the surface of the iron oxide collection housing (60).
  5. In claim 2, The above metal filter (50) is in the form of a vertically elongated column and is characterized by having a plurality of rows arranged in a zigzag position, spread out at a predetermined angle toward the inlet (31), thereby forming an HRSG iron oxide removal device with a combination of inertial force and centrifugal force.
  6. In claim 2, The above metal filter (50) is characterized by having a cylindrical cyclone-type trap (51) that generates centrifugal force against exhaust gas integrally formed at a column-shaped rear end that opens toward the inlet (31), thereby forming an HRSG iron oxide removal device with a combination of inertial force and centrifugal force.
  7. In claim 6, HRSG iron oxide removal device of the inertial force and centrifugal force combination method, characterized in that the above-mentioned cyclone-type trap (51) has an exhaust port (52) with a fine wire mesh structure formed therein.
  8. In claim 2, HRSG iron oxide removal device of the inertial force and centrifugal force combination method, characterized in that a triangular perforation (41) is formed in the lower region of the portion of the metal filter (50) that is opened at a predetermined angle in the entire area of the above porous plate (40).
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Description

HRSG Iron Oxide Removal Equipment Using Inertial and Centrifugal Combined Force in HRSG The present invention relates to an HRSG iron oxide removal device using a combined inertial force and centrifugal force method, and more specifically, to an HRSG iron oxide removal device using a combined inertial force and centrifugal force method capable of effectively capturing and filtering iron oxides contained in exhaust gas discharged from an HRSG, such as an LNG combined cycle power plant or a combined heat and power plant, by utilizing inertial force and centrifugal force. Generally, LNG combined cycle power plants or combined heat and power plants consist of gas turbines (GT), steam turbines (ST), and heat recovery steam generators (HRSG). The power generation process produces electricity by driving the gas turbine (GT) with high-temperature, high-pressure gas generated from the combustion of fuel, and simultaneously driving the steam turbine (ST) with steam generated in the heat recovery steam generator (HRSG) using the heat from the exhaust gas. In the power generation process described above, the exhaust gas after driving the gas turbine (GT) generates high-temperature, high-pressure steam by the heat recovery steam generator (HRSG), and this generated high-temperature, high-pressure steam drives the steam turbine (ST) and is then discharged into the outside atmosphere through the chimney of the heat recovery steam generator (HRSG). However, the aforementioned Heat Recovery Steam Generator (HRSG) is structured to maximize the absorption of residual heat from exhaust gases by applying internal fin tubes to expand the heat exchange surface area. Since the contact area with combustion exhaust gases is larger relative to the same capacity compared to a conventional combustion boiler, the exhaust gases discharged from the HRSG through the stack contain a large amount of iron oxides, and these iron oxides are released into the atmosphere. As such, when large amounts of iron oxides contained in the exhaust gas are released into the outside atmosphere through the chimney from the Heat Recovery Steam Generator (HRSG), it causes serious environmental pollution to the surrounding air and soil. Therefore, to solve this problem, various iron oxide removal devices are operated in most combined cycle power plants. In most combined cycle power plants, the dust collection filter method is mainly applied. However, with the iron oxide removal device described above, if the amount of iron oxide captured by the dust collection filter increases, the differential pressure before and after the filter rises, causing the back pressure of the gas turbine (GT) to increase. Consequently, the output of the gas turbine (GT) decreases in proportion to the increase in back pressure, which can lead to a significant loss in power generation. Furthermore, the iron oxide removal method using a dust collection filter requires periodic filter replacement, resulting in high maintenance costs. Accordingly, there is a need for the technological development of a new type of heat recovery steam generator (HRSG) iron oxide removal device that offers excellent filtration performance for iron oxides contained in exhaust gas discharged from the HRSG, economical maintenance costs for the removal device, and minimizes the reduction in output of the gas turbine (GT) by having a low differential pressure of the removal device itself. FIG. 1 is a schematic diagram showing the installation location and appearance of an HRSG iron oxide removal device of the inertial force and centrifugal force combination type according to the present invention. FIGS. 2 and FIGS. 3 are cross-sectional views illustrating the internal structure of an HRSG iron oxide removal device of the inertial force and centrifugal force combination type according to the present invention. FIG. 4 is a perspective view illustrating a metal filter of an HRSG iron oxide removal device of the inertial force and centrifugal force combination method according to the present invention. FIG. 5 is a cross-sectional view illustrating a metal filter of an HRSG iron oxide removal device using a combination of inertial force and centrifugal force according to the present invention. FIG. 6 is a plan view illustrating the state in which a metal filter of an HRSG iron oxide removal device of the inertial force and centrifugal force combination method according to the present invention is arranged on a porous plate. FIG. 7 is a detailed drawing showing the installation location and size of the discharge port of an HRSG iron oxide removal device of the inertial force and centrifugal force combination type according to the present invention. FIG. 8 is a front view illustrating the appearance and structure of an HRSG iron oxide removal device of the inertial force and centrifugal force combination type according to the present invention. FIG. 9 is a rear view showing the appearance and structure of an HRSG iron o