KR20200082535A - Device for collecting iron oxide and dust in the heat recovering steam generator - Google Patents

Abstract

The present invention relates to an apparatus for collecting iron oxide and fine dust generated from a heat recovery boiler to collect the iron oxide and the like generated from the heat recovery boiler by a roof shutter-type dust collection filter installed to a stack. To this end, according to the present invention, the apparatus comprises: a dust collection roof shutter installed on an upper opening part of the stack, which is a discharge path of exhaust gas containing iron oxide, to be opened and closed; the dust collection filter installed on the dust collection roof shutter to filter the iron oxide; a side exhaust pipe installed to a plurality of exhaust holes formed by penetrating the stack; and a bag filter airtightly and removably installed to the side exhaust pipe with an installation ring.

Description

DEVICE FOR COLLECTING IRON OXIDE AND DUST IN THE HEAT RECOVERING STEAM GENERATOR

The present invention relates to a device for trapping iron oxides generated in an array recovery boiler, and more specifically, using a roof shutter type dust collecting filter or the like installed in a stack to collect iron oxide and fine dust generated in an array recovery boiler. It relates to a device for collecting iron oxide and fine dust generated in an array recovery boiler capable of being collected.

Combined thermal power generation is performed by first operating the gas turbine using natural gas, etc., and then generating steam by passing the exhaust gas heat from the gas turbine back to the heat recovery boiler (HRSG), and then operating the steam turbine a second time to generate power. This system is mainly built around the city center for urgent power system because it has 10% higher thermal efficiency than existing thermal power and less pollution and shorter restart time. Combined thermal power plants are being operated in various regions, including the Seoincheon Combined Cycle Power Plant.

However, the combined cycle power plant built around the city center stops and starts repeatedly due to its characteristics for regular overhaul for removal of corrosive substances inside the heat recovery boiler (HRSG). In the case, iron oxide is generated on the inner surface of the heat exchange tube of the heat recovery boiler (HRSG), and this iron oxide is exfoliated by rapid temperature change when restarting power generation, and then exhaust gas containing fine dust in fine particle form In addition, it is discharged to a stack, which is a discharge passage, and eventually causes serious environmental pollution, such as corrosion of a steel structure installed around the power plant or the surface of a parked car.

Particularly, although the government has suspended the operation of old coal-fired power plants and implemented a policy to reduce fine dust, a large amount of iron oxide dust, including fine dust, is temporarily present at the beginning of a cold start that restarts after the power generation is stopped. Since the amount of dust that is being discharged is relatively larger than normal operation in the case of full load, it is in the situation of being subject to complaints due to the discharge of such iron oxide.

As a conventional technique for solving environmental pollution caused by the dust of iron oxide,'the iron oxide dust collecting device of an array recovery boiler' is disclosed in Korean Patent Publication No. 10-2012-0134613 and Korean Patent Publication No. 10-1390602. It is done.

However, the above conventional dust collecting device is only to filter and collect fine particles such as iron oxide contained in the exhaust gas by installing a porous filter member in the exhaust passage of the heat recovery boiler, so that the differential pressure increases when the amount of trapping in the filter member increases. As the back pressure rises, and the back pressure rises, the gas discharge is not smoothly performed, which not only decreases the efficiency of the power generation facility, but also increases the temperature of the exhaust gas and changes the filter member. There is a problem that it is not discharged into the air, and the conventional dust collecting device has a problem in that the filter member cannot be replaced during normal operation of the power generation facility because a continuously formed roll type filter member is installed and used.

Publication Patent Publication No. 10-2012-0134613 (2012.12.12) Registered Patent Publication No. 10-1390602 (2014.04.29)

The present invention has been devised to solve the above-mentioned conventional problems, and in collecting iron oxides and the like generated in the heat recovery boiler of a combined cycle power plant, a roof shutter type dust collecting filter or the like installed in a stack is used. It is an object of the present invention to provide a device for collecting iron oxide and fine dust generated in an array recovery boiler for easy collection.

In order to achieve the above object, the present invention, the roof shutter for dust collection is installed to be opened and closed in the upper opening of the stack (Stack) that is an exhaust passage of the exhaust gas containing iron oxide; A dust collecting filter mounted on the roof shutter for collecting dust to filter iron oxide; A side exhaust pipe mounted to a plurality of exhaust ports formed through the stack; And a bag filter which is mounted to the side exhaust pipe to be airtight and removable through a mounting ring. It provides a device for collecting iron oxide and fine dust generated from an array recovery boiler.

Particularly, the roof shutter for dust collection includes a main body having a rotating support shaft protruding from an upper surface as a pedestal structure fixedly mounted on the stack; A rotating ring provided with a structure in which an internal gear is formed on the inner diameter surface and a driven gear is formed on a portion of the outer diameter surface to be rotatably mounted on the main body; A plurality of blades provided with a structure in which the dust collecting filter is fixed, but having a pinion that is rotatably fastened to the rotational support shaft and fitted with an inner gear of the rotating ring at an inner end; And a driving gear engaged with the driven gear of the rotating ring as a rotating shaft and mounted on an outer surface of the main body.

Preferably, the blade is provided with two or more layers of lattice type wire mesh structure, and the dust collecting filter is fixedly mounted in the lattice type wire mesh.

In addition, the lower portion of the bag filter is characterized in that a collection discharge pipe for guiding the collected iron oxide to the collection box is connected.

In addition, a blocking damper having a slide opening and closing structure is mounted on the exhaust port.

In addition, the inside of the side exhaust pipe is characterized in that a suction fan is installed for suctioning iron oxide and fine dust toward the bag filter.

The present invention provides the following effects through the above-described problem solving means.

First, according to the present invention, iron oxides and fine dust generated in the heat recovery boiler (HRSG) of a power plant can be easily filtered and collected, and the increase in the back pressure of the gas turbine due to a device such as a dust collecting filter is minimized to improve power generation efficiency. Deterioration can be prevented.

Second, since the present invention is provided with a blocking damper, the bag filter can be easily replaced even during normal operation of power generation.

1 is an exploded perspective view showing a device for collecting iron oxide and fine dust generated in an array recovery boiler according to the present invention.
Figure 2 is a perspective view showing the closed state of the roof shutter for dust collection of iron oxide and fine dust collecting device generated in the heat recovery boiler according to the present invention.
Figure 3 is a perspective view showing the open state of the roof shutter for dust collection of the iron oxide and fine dust collecting device generated in the heat recovery boiler according to the present invention.
Figure 4 is an enlarged cross-sectional view of the main portion of the roof shutter opening and closing portion for dust collection of the iron oxide and fine dust collecting device generated in the heat recovery boiler according to the present invention.
5 is a plan view showing the operating state for the roof shutter for dust collection of the iron oxide and fine dust collecting device generated in the heat recovery boiler according to the present invention.
Figure 6 is a cross-sectional view showing the operating state for the roof shutter for dust collection of the iron oxide and fine dust collection device generated in the heat recovery boiler according to the present invention.
7 is a cross-sectional view taken along line AA in FIG. 1;
Figure 8 is a side view of the iron oxide and fine dust collecting device generated in the heat recovery boiler according to the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 to 3 is a perspective view showing a device for collecting iron oxide and fine dust generated in an array recovery boiler according to the present invention, reference numeral 10 denotes a stack (Stack).

The stack 10 is a passage through which exhaust gas generated from the heat recovery boiler of the combined cycle power plant is finally discharged to the outside, and an upper portion thereof is formed as an opening communicating with the outside air.

As described in the background of the invention, a combined cycle power plant repeats stopping and starting due to its characteristics for regular overhaul for removal of corrosive substances in the heat recovery boiler (HRSG). When starting and stopping, iron oxide is generated on the inner surface of the heat exchange tube of the heat recovery boiler (HRSG). This iron oxide is exfoliated by rapid temperature change when the electricity is restarted, and then converted into a fine particle state to be converted into exhaust gas. Together with the discharge path is discharged to the outside through the opening of the stack (10).

At this time, when the exhaust gas is discharged to the outside air through the stack 10, serious environmental pollution such as iron oxide and fine dust contained in the exhaust gas corrodes the steel structure installed around the power plant or the surface of the car being parked. Trigger.

Accordingly, the present invention is characterized in that a collection device capable of collecting iron oxide and fine dust is installed on the stack 10, which is the final discharge passage of iron oxide and fine dust generated in the heat recovery boiler.

The present invention is a roof shutter 20 for dust collection, including a dust collecting filter 30 in the upper opening of the stack 10, which is an exhaust passage of exhaust gas containing iron oxide, as shown in FIGS. ) Is installed to open and close.

The roof shutter 20 for dust collection is closed during operation of cooling to take into account the fact that a large amount of iron oxide is generated and discharged to the outside through the stack 10 when the cold start of the power generation unit is restarted, and the bag filter 50 and Together, iron oxide and the like are collected.

To this end, the main body 21 is fixedly mounted on the stack 10, and a rotating ring 22 is rotatably mounted on the main body 21, and a rotating ring is provided on the main body 21 and the rotating ring 22. A plurality of blades 23 that are opened and closed during rotation of the 22 are arranged.

The rotary ring 22 is provided with a structure in which an internal gear 22-1 is formed along a circumferential direction in an inner diameter portion, and a driven gear 22-2 is formed in a part of a circumferential section of an outer diameter portion on the main body 21. It is mounted rotatably.

For example, as shown in FIG. 4, a driven gear 22-2 is formed in a part of the circumferential section on the outer diameter surface of the rotary ring 22, and is formed on the outer wall surface of the stack 10 or the main body 21. The motor 24 is fixedly mounted via a bracket or the like, and a driving gear 24-1 is mounted on a rotating shaft of the motor 24 to drive the gear 24 of the motor 24 on the driven gear 22-2. By engaging 24-1), the rotating ring 22 is rotatable in the forward and reverse directions.

That is, the rotational force 22 is transmitted in the forward or reverse direction by the rotational force transmitted from the driving gear 24-1 to the driven gear 22-2 of the rotating ring 22 in the forward or reverse direction by the driving of the motor 24. Can be rotated.

In addition, a pinion 23-1 engaged with the inner gear 22-1 of the rotating ring 22 is mounted on the inner bottom surface of the blade 23, and the pinion 23 is mounted on the upper surface of the main body 21. The rotation support shaft 21-1 for rotation support of -1) is integrally formed.

Accordingly, the central portion of the pinion 23-1 of the blade 23 is rotatably fastened to the rotation support shaft 21 so that the blade 23 is opened and closed at a predetermined trajectory when the pinion 23-1 rotates. Can.

Therefore, when the rotating ring 22 rotates in the forward direction, the pinion 23-1 of the blade 23 engaged with the internal gear 22-1 rotates in the forward direction, thereby opening the blade 23, and When the rotating ring 22 rotates in the reverse direction, the pinion 23-1 of the blade 23 engaged with the internal gear 22-1 rotates in the reverse direction, thereby closing the blade 23.

At this time, the blade 23 is provided with a structure of two or more layers of lattice wire mesh 23-2, and as shown in FIG. 7, the dust collecting filter 30 has a lattice wire mesh 23-2 of the blade 23 ).

Meanwhile, a plurality of exhaust ports 42 are formed in the stack 10 along its circumferential direction, and side exhaust pipes 40 are connected to each exhaust port 42, and a mounting ring 52 is attached to the side exhaust pipes 40. The bag filter 50 is mounted to maintain airtightness and removal.

Preferably, 6 to 12 bag filters 50 are mounted in consideration of the back pressure of the gas turbine.

In addition, a blocking damper 44 having a slide opening/closing structure such as a shutter is mounted on the exhaust port 42 to open the blocking damper 44 when it is necessary to collect iron oxide, such as during cold start and normal operation.

Preferably, as shown in Figure 8, the bag discharge pipe 54 is connected to the lower portion of the bag filter 50, and by connecting the lower end of the collection outlet pipe 54 to the collection box 56, the bag filter The iron oxide collected in 50 is finally collected in the collection box 56 through the collection discharge pipe 54.

On the other hand, inside the side exhaust pipe 40, a motor-driven suction fan 46 for sucking iron oxide or the like toward the bag filter 50 is mounted.

When describing the operation for the iron oxide and fine dust collecting device generated in the heat recovery boiler of the present invention made of the above-described configuration is as follows.

The attached Figures 2 to 6 show the operating state of closing and opening of the roof shutter for dust collection of the iron oxide and fine dust collecting device generated in the heat recovery boiler according to the present invention.

In the combined cycle power plant, a large amount of iron oxide is generated from the exhaust heat recovery boiler during cold start to restart the power generation device and is discharged to the outside through the stack 10, so the roof shutter for dust collection described above during cold start of the power generation device 20 By closing the iron oxide and the like is filtered by the dust collecting filter 30 included in the roof shutter 20 for dust collecting so that it can be collected.

To this end, when the motor 24 is driven in the forward direction, the driving gear 24-1 mounted on the output shaft of the motor 24 rotates, and subsequently the driven gear of the rotating ring 22 from the driving gear 24-1 As the rotational force is transmitted to (22-2), the rotation ring 22 is rotated in the reverse direction.

Accordingly, when the rotating ring 22 rotates in the reverse direction, the pinion 23-1 of the blade 23 engaged with the inner gear 22-1 of the rotating ring 22 rotates in the reverse direction, thereby causing the blade 23 to rotate. The closing operation is made.

Accordingly, each blade 23 of the dust-collecting roof shutter 20 is located in a closed position, so that iron oxide or the like is easily filtered by a dust collecting filter 30 fixed to the grid-like wire mesh of each blade 23 Will be captured.

On the other hand, during normal operation of the power generation device, in order to discharge only exhaust gas through the stack 10 to outside air, the roof shutter 20 for dust collection is opened.

To this end, when the motor 24 is driven in the reverse direction, the driving gear 24-1 mounted on the output shaft of the motor 24 rotates, and subsequently the driven gear of the rotating ring 22 from the driving gear 24-1. As the rotational force is transmitted to (22-2), the rotation ring 22 is rotated in the forward direction.

Therefore, the pinion 23-1 of the blade 23 engaged with the inner gear 22-1 of the rotating ring 22 rotates in the forward direction when the rotating ring 22 rotates in the forward direction, thereby causing the blade 23 to rotate. The opening operation is made.

At this time, the inside of the side exhaust pipe 40 is equipped with a motor-driven suction fan 46 for suctioning iron oxide or the like toward the bag filter 50, so that the iron oxide and dust collecting filter discharged through the stack 10 ( The iron oxide or the like removed from 30) is sucked into the side exhaust pipe 40 by the suction force of the suction fan 46 and then filtered by the bag filter 50 to be easily collected.

On the other hand, the bag filter 50 is to open and close the shut-off damper 44 having a shutter structure during cold start and normal operation to restart after power generation is stopped, and collect iron oxide, etc. Iron oxide and the like are discharged to the exhaust port by a radial flow fan to collect iron oxide and to collect fine dust and the like during normal operation.

At this time, the exhaust port 42 is equipped with a blocking damper 44 having a slide opening and closing structure such as a shutter to open the blocking damper 44 when it is necessary to capture iron oxides, such as during cold start and normal operation.

On the other hand, the collection discharge pipe 54 is connected to the lower portion of the bag filter 50, by connecting the lower end of the collection discharge pipe 54 to the collection box 56, the iron oxide collected in the bag filter 50 It is finally collected in the collection box 56 through the collection discharge pipe 54.

As described above, the present invention can easily collect the iron oxide and fine dust generated in the heat recovery boiler, and minimize the rise in the back pressure of the gas turbine due to a device such as a dust collecting filter to prevent a decrease in power generation efficiency. Can.

10: stack 20: roof shutter for dust collection
21: main body 21-1: rotating support shaft
22: rotating ring 22-1: internal gear
22-2: driven gear 23: blade
23-1: Pinion 23-2: Grid wire mesh
24: motor 24-1: drive gear
30: dust collecting filter 40: side exhaust pipe
42: exhaust port 44: shut-off damper
46: suction fan 50: bag filter
52: mounting ring 54: collection discharge pipe
56: collection box

Claims (6)

A roof shutter 20 for dust collection which is installed to be opened and closed in an upper opening of a stack 10 which is an exhaust passage for exhaust gas containing iron oxide;
A dust collecting filter 30 mounted on the dust collecting roof shutter 20 to filter iron oxide;
A side exhaust pipe 40 mounted to a plurality of exhaust ports 42 formed through the stack 10; And a bag filter 50 mounted to the side exhaust pipe 40 to be airtight and detachable via a mounting ring 52, collecting iron oxide and fine dust generated from the heat recovery boiler. Device.
The method according to claim 1,
The roof shutter 20 for dust collection includes a main body 21 having a rotating support shaft 21-1 projecting on an upper surface as a pedestal structure fixedly mounted on the stack 10;
An inner gear 22-1 is formed on the inner surface, and a driven gear 22-2 is formed on a portion of the outer surface with a rotating ring 22 rotatably mounted on the main body 21. ;
The dust collecting filter 30 is provided with a fixed structure, but is rotatably fastened to the rotating support shaft 21 at an inner end, and at the same time, a pinion 23 that meshes with the inner gear 22-1 of the rotating ring 22 -1) a plurality of blades 23 provided with a mounted structure;
It characterized in that it comprises a; motor 24 mounted to the outer surface of the main body 21 while having a driving gear (24-1) engaged with the driven gear (22-2) of the rotary ring (22) as a rotation axis; A device for collecting iron oxide and fine dust generated from an array recovery boiler.
The method according to claim 2,
The blade 23 is provided in a structure of two or more lattice wire mesh 23-2, and the dust collecting filter 30 is generated in an array recovery boiler characterized in that it is fixedly mounted in the lattice wire mesh 23-2. Iron oxide and fine dust collecting device.
The method according to claim 1,
A device for collecting iron oxide and fine dust generated from an array recovery boiler, characterized in that a collection outlet pipe 54 for guiding the collected iron oxide to the collection box 56 is connected to a lower portion of the bag filter 50.
The method according to claim 1,
A device for collecting iron oxide and fine dust generated in an exhaust heat recovery boiler, characterized in that a blocking damper 44 having a slide opening and closing structure is mounted on the exhaust port 42.
The method according to claim 1,
A device for collecting iron oxide and fine dust generated from an array recovery boiler, characterized in that a suction fan (46) for suctioning iron oxide toward the bag filter (50) is mounted inside the side exhaust pipe (40).

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