KR20210000425U - Air inlet filter comprising removable filter bag - Google Patents

Abstract

The present invention is an air inlet filter comprising a filter body configured in a mesh-like cylindrical shape with open both ends, comprising: a frame positioned at an outer diameter of one end of the air inlet filter; And a filter bag having one end open to the frame fixed and the other end enclosing the filter body of the air inlet filter in a closed mesh-like encapsulation shape, wherein the introduced unpurified air passes through the filter bag. Thus, it relates to an air inlet filter provided with a removable filter bag, which is transferred into the filter body of the air inlet filter. According to the above configuration, it is possible to extend the life of the air inlet filter and to effectively remove adhering dust while minimizing the interruption of operation of a facility in which the air inlet filter is installed.

Description

Air inlet filter comprising removable filter bag

The present invention relates to an air inlet filter provided with a removable filter bag. In more detail, the present invention relates to an air inlet filter equipped with a removable filter bag capable of effectively removing attached dust while extending the life of an air inlet filter and minimizing operation interruption of a facility in which the air inlet filter is installed.

Air inlet filters for intake air purification are used in various technical fields to filter out dust or foreign substances contained in the air.

In a thermal power plant using a gas turbine, an air inlet filter for purifying the intake air is used to purify the air in the atmosphere flowing into the compressor of the gas turbine.

In general, thermal power generation is generated by injecting clean air from the outside, compressing it in a compressor, and injecting it into a combustor with fuel to mix it, and burning the mixed air and fuel and injecting it to the turbine blades using high-temperature and high-pressure combustion gas. It is a power generation method by rotational force. Since the turbine for power generation is composed of large and very precise parts, planned preventive maintenance must be carried out periodically.

In particular, the air sucked into the compressor must be purified through an air inlet filter before use. Therefore, an air inlet filter is installed on the air intake side of the power generation facility to supply clean and dry air by removing dust, foreign matter, and moisture contained in the external air. By purifying the external air in the air inlet filter installed as described above, only purified air is always introduced into the compressor, thereby improving compression and combustion efficiency, as well as preventing abrasion or failure of components constituting the gas turbine. . The most important consideration in the air inlet filter is the negative pressure of the intake air. If the negative pressure of the intake air is large, the intake air is small, resulting in incomplete combustion or output reduction. Therefore, periodic air inlet filter replacement and cleaning are required.

The above air inlet filter removes foreign substances such as dust and dust contained in the air when taking combustion air sucked into the gas turbine in the atmosphere, purifies it, and supplies it to the gas turbine. Because it is exposed, it is a consumable part that requires periodic cleaning and replacement. If the filter is contaminated, the efficiency of the gas turbine and the reliability of the power generation facility are low. In general, when humid dust and foreign substances in the air are introduced and attached to the filter, the life of the filter is shortened compared to the existing clean air. In a clean atmosphere, the life of the filter is about 16 months, whereas the life of the filter in a humid, dusty area can be very shortened to about 3 months.

On the other hand, it takes about 23 days to replace the contaminated air inlet filter and required parts, and since the power plant is stopped during this period, there is a problem of causing enormous economic loss.

Republic of Korea Patent Publication No. 10-2014-0135757 (2014.11.26.)

An object of the present invention is to provide an air inlet filter capable of prolonging the replacement cycle of the air inlet filter by extending the durability or life of the air inlet filter.

Another object of the present invention is to provide an air inlet filter capable of effectively removing dust attached to an air inlet filter while minimizing system operation interruption due to replacement of a contaminated air inlet filter and required parts.

The object of the present invention is not limited to the objects mentioned above, and other objects not mentioned will be clearly understood from the description of the detailed description.

According to one aspect, an air inlet filter including a filter body configured in a mesh-like cylindrical shape with open both ends, comprising: a frame positioned at an outer diameter of one end of the air inlet filter; And a filter bag having one end open to the frame fixed and the other end enclosing the filter body of the air inlet filter in a closed mesh-like encapsulation shape, wherein the introduced unpurified air passes through the filter bag. Thus, there is provided an air inlet filter provided with a detachable filter bag that is delivered into the filter body of the air inlet filter.

According to an embodiment, the frame may be fixed to be detachably attached to an outer diameter of one end of the air inlet filter, and an open end of the filter bag may be fixed to the frame to be integrated.

According to one embodiment, the frame is a bush; And a fastening hole formed in the bush, and an open end of the filter bag may be fixed to the frame by a fastening member fastened to the fastening hole.

According to an embodiment, the frame may be made of metal or resin.

According to an embodiment, the filter bag is made of polyester, acrylic, polyethylene, polypropylene, viscose rayon, polyethylene terephthalate, polybutylene terephthalate, nylon, polyphenylene sulfide, polycarbonate, and polyester glycol. It may be made of at least one resin selected from the group consisting of.

According to one embodiment, the frame is a bush; And a ring shape surrounding the outer diameter of the bush, and having a coupling hole at both ends thereof extending outward, and a fixing ring 160 that is in close contact with the bush by a fixing member coupled to the coupling hole. The open end of the filter bag may be inserted and fixed between the bush and the fixing ring.

According to an embodiment, the air inlet filter may be an air inlet filter for purifying air intake to purify air in the atmosphere introduced into the compressor of the gas turbine.

According to another aspect, there is provided an intake air purification device including at least one air inlet filter of the present application, and purifying air in the atmosphere introduced into the compressor of gastermin.

According to another aspect, a method of removing dust or foreign matter in the intake air purification apparatus, comprising: separating the frame from an outer diameter of an air inlet filter or separating an open end of a filter bag from the frame; And separating the filter bag from the air inlet filter. A method of removing dust or foreign matter in an intake air purification apparatus is provided.

According to an embodiment of the present invention, a filter bag is provided to minimize the mixing of dust and foreign matter into the air inlet filter, thereby extending the durability or life of the air inlet filter, thereby increasing the replacement cycle of the air inlet filter by about 4 times. Can be extended to.

In addition, according to an embodiment of the present invention, the life of the air inlet filter can be extended by minimizing direct contact of humid dust and foreign substances to the air inlet filter by providing a filter bag. It can prevent failure of various parts in the device to be installed.

If the air inlet filter of the present invention is installed on the air intake side of a power generation facility, the life of the air inlet filter is extended and failure of various parts is prevented, thereby minimizing shutdown of the power plant and enabling smooth operation of the power plant.

According to an embodiment of the present invention, it is possible to shorten the time required to replace the contaminated filter only and required parts to about 2 days, and since the replacement of the filter only is possible even during operation, dust attached to the air inlet filter can be effectively removed. Can be removed. Therefore, in the power plant, it is possible to minimize the power generation stoppage due to the replacement of the air inlet filter, thereby reducing the cost by about 66% or more.

1 is a view schematically showing a filter bag according to an embodiment of the present invention.
2 is a diagram schematically showing that a filter bag according to an embodiment of the present invention is coupled to an air inlet filter.
3A and 3B are photographs showing states before and after the filter bag is coupled to the air inlet filter according to an embodiment of the present invention.
4 is a photograph showing a state in which dust is attached to a filter bag of an air inlet filter equipped with a filter bag according to an embodiment of the present invention.
5 is a photograph showing a state in which a filter bag attached with dust is separated from an air inlet filter equipped with a filter bag according to an embodiment of the present invention.
6 is a contrast photo of a filter bag to which dust is attached and used separated from the air inlet filter of FIG. 5 and an unused filter bag.
7 is a photograph showing a state in which moisture is attached to a filter bag of an air inlet filter equipped with a filter bag according to an embodiment of the present invention.
8 is a photograph showing a frame for installing a filter bag in an air inlet filter according to another embodiment of the present invention.
9A and 9B are graphs showing changes in pressure of a turbine according to the installation of an air inlet filter with a filter bag according to another embodiment of the present invention.

Objects, specific advantages and novel features of the present invention will become more apparent from the following detailed description and embodiments associated with the accompanying drawings.

Prior to this, terms or words used in the present specification and claims should not be interpreted in a conventional and dictionary meaning, and the designer may appropriately define the concept of the term in order to explain his or her own design in the best way. Based on the principle that there is, it should be interpreted as a meaning and concept that conforms to the technical idea of the present invention.

Terms used in the present application are used only to describe specific embodiments, and are not intended to limit the present invention. Singular expressions include plural expressions unless the context clearly indicates otherwise.

In the present application, terms such as "comprise" or "have" are intended to designate the presence of features, numbers, steps, actions, components, parts, or combinations thereof described in the specification, but one or more other features. It is to be understood that the presence or addition of elements or numbers, steps, actions, components, parts, or combinations thereof, does not preclude in advance.

In addition, throughout the specification, the term "on" means to be positioned above or below the target portion, and does not necessarily mean to be positioned above the direction of gravity.

In the present invention, various transformations may be applied and various embodiments may be provided, and specific embodiments will be illustrated in the drawings and described in detail in the detailed description. However, this is not intended to limit the present invention to a specific embodiment, it should be understood to include all conversions, equivalents, or substitutes included in the spirit and scope of the present invention. In describing the present invention, if it is determined that a detailed description of related known technologies may obscure the subject matter of the present invention, the detailed description thereof will be omitted.

1 is a view schematically showing a filter bag according to an embodiment of the present invention, Figure 2 is a view schematically showing that the filter bag according to an embodiment of the present invention is coupled to an air inlet filter. 3A and 3B are photographs showing states before and after the filter bag is coupled to the air inlet filter according to an embodiment of the present invention.

1 to 3B, an air inlet filter 300 provided with a removable filter bag according to an aspect of the present application includes an air inlet filter including a filter body 310 configured in a mesh-shaped cylindrical shape with open both ends ( In 300), the frame 100 located at an outer diameter of one end of the air inlet filter 300; And a filter bag 200 surrounding the filter body 310 of the air inlet filter 300 in a closed mesh-like encapsulation shape and the other end being fixed to the frame 100, The introduced unpurified air passes through the filter bag 200 and is delivered into the filter body 310 of the air inlet filter 300.

The frame 100 is fixed to the outer diameter of one end of the air inlet filter 300 so as to be detachable, and the open end of the filter bag 200 is fixed to the frame 100 to be integrated. In the integrated state of the frame 100 and the filter bag 200 according to the above configuration, the filter bag 200 is fitted into the air inlet filter 300, and the frame 100 is the air inlet filter 300. ) Is fixed to the outer diameter of one end. If the filter bag 200 is contaminated in the future, the frame 100 is separated from the outer diameter of one end of the air inlet filter 300 so that the filter bag 200 can be easily separated from the air inlet filter 300. I can.

Integration of the frame 100 and the filter bag 200 may be performed by a known means, but is not limited thereto. For example, an adhesive or a fastening member such as screws and bolts may be used.

Although not limited thereto, the frame 100 may include a bush 120; And a fastening hole 140 formed in the bush 120, and an open end of the filter bag 200 is fixed to the frame 100 by a fastening member fastened to the fastening hole 140. Can be. The fastening member may use known fastening means such as screws and bolts. In addition, the frame 100, the filter bag 200, and the air inlet filter 300 may be simultaneously fastened by using the screws and bolts.

The frame 100 may be made of metal or resin, but is not limited thereto, but may be made of metal, and may be made of stainless steel to prevent corrosion.

The filter bag 200 has a mesh-shaped encapsulation shape and is surrounded by the outside of the filter body 310 of the air inlet filter 300, and acts as a pre-filter class air filter. The filter bag 200 may be integrally combined with the filter body 310 when air is introduced.

Meanwhile, it may be possible to more effectively filter dust, foreign matter, or moisture contained in the air according to the mesh size of the filter bag 200. In consideration of the characteristics of the location where the air inlet filter 300 is installed, a person skilled in the art may maximize the filtering effect by adjusting the mesh size of the filter bag 200.

The filter bag 200 is from the group consisting of polyester, acrylic, polyethylene, polypropylene, viscose rayon, polyethylene terephthalate, polybutylene terephthalate, nylon, polyphenylene sulfide, polycarbonate, and polyester glycol. It may be made of one or more selected resins. Although not limited thereto, the filter bag 200 is made of a nonwoven fabric made of polyester, which has low pressure loss, excellent strength and shape stability, excellent collection efficiency, and is particularly suitable for use as a pre-filter-class air filter. May be suitable.

4 is a photograph showing a state in which dust is attached to a filter bag of an air inlet filter equipped with a filter bag according to an embodiment of the present invention, and FIG. 5 is an air inlet filter provided with a filter bag according to an embodiment of the present invention. This is a picture showing the filter bag with dust attached to it from 6 is a contrast photo of a filter bag to which dust is attached and used separated from the air inlet filter of FIG. 5 and an unused filter bag.

As shown in FIGS. 4 to 6, according to an embodiment of the present invention, a filter bag is provided to minimize the mixing of dust and foreign matter into the air inlet filter, thereby extending the durability or life of the air inlet filter. Thus, the replacement cycle of the air inlet filter can be extended up to about 4 times.

7 is a photograph showing a state in which moisture is attached to a filter bag of an air inlet filter equipped with a filter bag according to an embodiment of the present invention.

As shown in FIG. 7, according to an embodiment of the present invention, a filter bag is provided to minimize direct contact of humid dust and foreign matter to the air inlet filter, thereby extending the life of the air inlet filter. And prevents failure of various components in the device where the air inlet filter is installed.

Although not limited thereto, the air inlet filter 300 of the present application may be an air inlet filter for purifying intake air for purifying air in the atmosphere introduced into the compressor of the gas turbine.

If the air inlet filter of the present invention is installed on the air intake side of a power generation facility, the life of the air inlet filter is extended and failure of various parts is prevented, thereby minimizing shutdown of the power plant and enabling smooth operation of the power plant.

8 is a photograph showing a frame for installing a filter bag in an air inlet filter according to another embodiment of the present invention.

Referring to FIG. 8, the frame 100' includes a bush 120'; And a fixing ring 160. The fixing ring 160 has a ring shape surrounding the outer diameter of the bush 120 ′, and both ends 162 are extended to the outside to have a coupling hole, and by a fixing member 164 coupled to the coupling hole. It may be in close contact with the bush 120'. The open end of the filter bag 200 may be inserted between the bush 120 ′ and the fixing ring 160 and fixed by the fixing member 164. The fixing member 164 may be, for example, a bolt and a nut if a number of known techniques can be applied. Reference numeral 170 denotes a flange.

According to another aspect, there is provided an intake air purification device including at least one air inlet filter of the present application and purifying air in the atmosphere introduced into a compressor of a gas turbine.

3A to 3B, a plurality of air inlet filters for supplying only purified air by filtering out dust, foreign matter, and moisture contained in external air are provided at the intake side inlet in the intake air purification device of the power generation facility. It is installed in the housing of the device.

When a filter bag is detachably provided in the plurality of air inlet filters, it is possible to extend the life of the air inlet filter by minimizing direct contact of dust, foreign matter, and moisture to the air inlet filter, and the air inlet filter is installed. It is possible to prevent failure of various parts in the device.

According to another aspect, a method of removing dust or foreign matter in the intake air purification apparatus, comprising: separating the frame from an outer diameter of an air inlet filter or separating an open end of a filter bag from the frame; And separating the filter bag from the air inlet filter. A method of removing dust or foreign matter in an intake air purification apparatus is provided.

According to the above configuration, since only the filter bag 200 can be easily separated from the air inlet filter 300, the time required to replace the contaminated filter bag 200 and required parts can be reduced to about 2 days. Also, since only the filter bag 200 can be replaced during operation, dust attached to the air inlet filter can be effectively removed. Therefore, in the power plant, it is possible to minimize the power generation stoppage due to the replacement of the air inlet filter, thereby reducing the cost by about 66% or more.

The present invention will be described in more detail through the following examples, but the scope of the present invention is not limited to the following examples.

[ Example ]

In order to check the characteristics of the air inlet filter with the filter bag manufactured according to the present application, a filter fixing frame made of stainless steel was installed outside the air inlet filter housing of the power plant, and the filter net was firmly fixed to the frame and integrally combined. After installing the removable filter bag, the effect of having the filter bag was analyzed. The environment around the power plant where the air inlet filter according to the present invention is installed is in a textile factory, and the climate was an environment where a lot of dust was generated.

The analysis results are shown in Table 1, FIGS. 9A, and 9B.

As shown in Table 1, under the analysis environment, the life of the existing air inlet filter is about 3 months, while the life of the air inlet filter equipped with the filter bag according to the present invention has been improved by about 4 times to about 12 months. have.

Item Comparative example
(existing) Example
(Installation of filter bag) Air inlet filter
Exchanging periods 3 months 12 months Replacement period 23 days/time 23 days/time (2 days when only filter is replaced) Power generation suspension period 23 days X 8 times = 184 days/2 years 23 days X 2 times = 46 days/2 years Cost required
(2 years) 30,257,312 USD 10,078,408 USD
(66.3% reduction compared to the previous one) Material cost
(Filter purchase, etc.) $150,000 X 8 times = $1.2 million Filter Element: $150,000 X 2 times = $300,000
Filter Bag Additional Material Cost: About USD 50,000 labor cost
(Replacement workforce) 42,000 USD X 8 times = 336,000 USD 50% expected Equipment cost
(Crane, etc.) 14,000 USD X 8 times = 112,000 USD 28,000 USD (2 times) shipping fee
(Filter transport and
Customs clearance) 5,000 USD X 8 times = 40,000 USD 10,000 USD (2 times) Power generation shutdown cost
(Based on 230MW) 227Mw X 24hr X 184 day X 28.5USD/Mw/hours= 28,569,312USD 227Mw X 24hr X 46day X 28.5USD/Mw/hours= 9,648,408USD
(66.3% reduction compared to the previous one)

As described above, the effect of the present application was proved through comparison of the Examples and Comparative Examples in the replacement cycle, power generation stop period, and required cost. As can be seen from Table 1, the life of the filter was improved by about 4 times or more, and it was confirmed that the replacement cost can be reduced by about 66% for about 2 years.

9A and 9B are graphs showing changes in pressure of a turbine according to the installation of an air inlet filter with a filter bag according to another embodiment of the present invention.

The air inlet filter was replaced from 21. to 30. March, 2019, and the filter bag was firstly installed on the air inlet filter from 02. to 03. April, and the air inlet filter on June 03, 2019. The filter bag was installed secondarily.

9A and 9B, when the air inlet filter is replaced, the operation of the generator must be completely stopped, but when the filter bag is replaced, the operation of the generator does not need to be completely stopped. The negative pressure can be adjusted to an appropriate range.

As described above, one embodiment of the present invention has been described, but those of ordinary skill in the relevant technical field add, change, delete or add components within the scope not departing from the spirit of the present invention described in the claims. Various modifications and changes may be made to the present invention by addition or the like, and it will be said that this is also included within the scope of the present invention.

100, 100': frame
120, 120': bush
140: fastening hole
160: retaining ring
162: both ends
164: fixing member
170: flange
200: filter bag
300: air inlet filter
310: filter sieve

Claims (9)

In the air inlet filter comprising a filter body configured in a mesh-like cylindrical shape with open both ends,
A frame positioned at an outer diameter of one end of the air inlet filter; And
Including; a filter bag having one end open to the frame fixed and the other end enclosing the filter body of the air inlet filter in a closed mesh-like encapsulation shape,
An air inlet filter provided with a removable filter bag, wherein the introduced unpurified air passes through the filter bag and is delivered into the filter body of the air inlet filter.
The method of claim 1,
The frame is fixed to be detachably attached to an outer diameter of one end of the air inlet filter, and an open end of the filter bag is fixed to the frame to be integrated. An air inlet filter provided with a removable filter bag.
The method of claim 1,
The frame is a bush; And a fastening hole formed in the bush,
An open end of the filter bag is fixed to the frame by a fastening member fastened to the fastening hole. An air inlet filter provided with a removable filter bag.
The method of claim 1,
The frame is made of metal or resin, an air inlet filter provided with a removable filter bag.
The method of claim 1,
The filter bag is one selected from the group consisting of polyester, acrylic, polyethylene, polypropylene, viscose rayon, polyethylene terephthalate, polybutylene terephthalate, nylon, polyphenylene sulfide, polycarbonate, and polyester glycol. An air inlet filter with a removable filter bag made of the above resin.
The method of claim 1,
The frame is a bush; And a ring shape surrounding the outer diameter of the bush, and having a coupling hole at both ends thereof extending outward, and a fixing ring that is in close contact with the bush by a fixing member coupled to the coupling hole,
An air inlet filter provided with a removable filter bag, wherein an open end portion of the filter bag is inserted and fixed between the bush and the fixing ring.
The method of claim 1,
The air inlet filter is an air inlet filter for purifying air intake for purifying air in the atmosphere introduced into a compressor of a gas turbine. An air inlet filter provided with a removable filter bag.
An intake air purification device comprising at least one air inlet filter according to any one of claims 1 to 7, and purifying air in the atmosphere flowing into the compressor of the gas turbine.
In the dust or foreign matter removing method of the intake air purification device according to claim 8,
Separating the frame from the outer diameter of the air inlet filter or separating the open end of the filter bag from the frame; And
Separating the filter bag from the air inlet filter,
How to remove dust or debris from the intake purification device.

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