JP2007046587A - Air intake filter unit for gas turbine, and air intake device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a high performance and compact air intake filter unit for a gas turbine. <P>SOLUTION: In the air intake filter unit 1 for the gas turbine, a medium performance filter pack 7 in which a low efficient filter material is folded, and a high performance filter pack 2 in which a high efficient filter material is folded are arranged in one filter frame perpendicular to air current and in the air current direction so that collection efficiency is successively increased. The high-performance filter pack in the rear stage is closely fixed in the filter frame 5 with an adhesive such as a urethane seal material, etc., not so as to leak air. The medium performance filter pack in the front stage is attachably and detachably installed in the filter frame. In designing the filter life time in each stage including a pre-filter, the life time of the high-performance filter is made longer than the longest period of a periodic repair, and the medium performance filter and pre-filter come to the end of the life time shorter than the period. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an intake filter unit and an intake device for purifying air taken into a gas turbine.

  Conventionally, a gas turbine intake filter has been required to maintain stable dust collection efficiency for a long period of time, but recently, in order to prevent a reduction in the output of the gas turbine, 0.3 μm particles are used as the final stage filter. It is demanded to install a high-performance filter capable of removing more than%. Because adding a high-performance filter to an existing gas turbine intake system is often difficult due to space requirements, and even in the case of a new installation, space saving is strongly desired. As a filter, low-efficiency filter media and high-efficiency filter media are closely stacked as in Patent Documents 1, 2, and 3, and a medium performance filter level as in Patent Document 4 is intended to save installation space. There is an attempt to save installation space as a laminated filter medium in which a low-efficiency filter medium and a high-efficiency filter medium with a high-performance filter are integrated.

  However, in either filter, the low-efficiency filter medium and the high-efficiency filter medium rarely reach the end of their lives at the same time, and it is necessary to replace them with the shorter filter medium life. Compared to the conventional gas turbine intake system, the replacement period of the high-performance filter tends to be shorter, and establishment of reliability for practical use is desired.

  On the other hand, in the gas turbine intake filter, the lifetime of the most expensive high-performance filter is usually set to be replaced by regular repairs, for example, every three years, and the medium-performance filter in the previous stage is regularly repaired once a year. The filter is designed in accordance with a maintenance plan such that the prefilter is replaced by a periodic inspection once every six months or once a year.

  However, the long-term three-year weather, weather, and changes in the surrounding environment may exceed expectations, and it may be necessary to replace the filter sooner than planned.

  In contrast to the current state of such an intake filter for gas turbine,

Filters that have reached the end of their service life, such as filters with a structure in which a low-efficiency filter medium and a high-efficiency filter medium are in close contact with each other, or a filter that uses a single filter medium in a low-efficiency layer or multiple layers of high-efficiency layers Since only the filter medium or the filter medium layer cannot be exchanged, the filter medium that has not reached the end of its life is taken out together and discarded. Although it is functionally usable, it cannot be separated, so it is a great loss to be discarded.

In addition to the disadvantage that the above technology cannot change the combination of the medium performance filter and the high performance filter medium, or the combination of the low efficiency and high efficiency filter medium layers, until the filter life is reached. Strictly speaking, since the particle size distribution of atmospheric dust varies depending on the installation environment of the gas turbine, it is necessary to study the optimum combination of medium performance and high performance filter media each time in order to extend the service life. Has various drawbacks, for example, the disadvantage of being out of the design value due to the uneconomical or unexpected disturbance of designing and selecting the filter medium for each installation location of the gas turbine. This disadvantage is also the cause of the above-mentioned technology reaching the end of its life in a shorter period than the target.
JP 7-253028 A JP 7-253029 A JP 2002-292215 A Republished patent WO2003-043717

Problems to be solved by the invention

  First, an object of the present invention is to provide a gas turbine intake filter unit having a compact and simple structure, characterized in that two filter packs of a medium performance filter and a high performance filter are provided in one filter frame. It is what I tried to provide.

  Further, an object of the present invention is to replace the medium performance filter and the prefilter until the lifetime of the expensive high performance filter can be fully exhibited.

Another object of the present invention is to make it possible to review the performance of the medium-performance filter medium based on the results of changes in the weather, the weather, and the surrounding environment.

  Furthermore, an object of the present invention is to provide an air intake apparatus that eliminates the need for a space for replacing a high-performance filter and that can reduce the housing space to make the air intake apparatus compact and reduce manufacturing costs. An object of the present invention is to add a high-performance filter without requiring a major remodeling and to prevent a reduction in the output of the gas turbine.

Means for solving the problem

  The solution of the present invention is characterized in that two types of filter packs are provided perpendicularly to the air flow in one filter frame and arranged so that the collection efficiency is sequentially increased in the air flow direction.

  Another solution is characterized in that the high-performance filter pack on the final stage, that is, the secondary side, is tightly fixed in the filter frame so as not to leak air with an adhesive such as a urethane sealant.

  Yet another solution is characterized in that the intermediate performance filter pack in the previous stage is detachably mounted in the filter frame so that it can be replaced when the medium performance filter reaches the end of its life.

  Yet another solution is that in the design of the filter life of each stage including the pre-filter, the performance of the high-performance filter is longer than the regular repair of the longest cycle, and the life of the medium-performance filter and the pre-filter is reached in a shorter cycle. It is characterized by being designed.

  Here, the high-performance filter has an efficiency of 90 to 99.99% (according to JIS B 9908 test method type 1) with 0.3 μm particles or more. The medium performance filter means one having an efficiency of 65 to 95% (according to JIS B 9908 test method type 2) or more. Furthermore, a high performance filter pack refers to a material obtained by folding a high efficiency filter medium, and a medium performance filter pack refers to a material obtained by folding a low efficiency filter medium.

  The effect | action by the said problem-solving means is as follows. That is, the atmosphere sucked into the housing by the gas turbine intake operation first passes through the prefilter. Here, air dust having a coarse particle diameter is removed, and air containing fine air particle dust is inhaled. Here, the medium performance filter pack and the high performance filter pack are arranged in one filter frame so that the collection efficiency is sequentially increased in the direction perpendicular to the air flow and in the air flow direction. Air passes through the high-performance filter and is supplied to the gas turbine as clean air with a particle size of about 0.3 μm and 99.9% or more removed. This does not degrade the performance of the gas turbine.

  Then, each filter becomes clogged due to long-term continuous operation, and when it reaches the end of its life, it will be replaced with a new filter. In the filter life design of the present invention, the life of the medium performance filter is the same as that of the high performance filter. Since the filtration performance of the medium performance filter and the pre-filter is selected so as to suppress it to 1/2 or less of the lifetime, the lifetime of the subsequent high performance filter is made longer than the replacement target period by exchanging the medium performance filter several times. be able to.

  For this reason, until the lifetime of the high-performance filter, it is possible to cope with simple maintenance by renewing only the pre-filter and the medium-performance filter pack stored in a replaceable manner. Furthermore, when the life of the high performance filter comes, the gas turbine filter unit may be updated at once.

The invention's effect

As described above, the gas turbine filter unit and the intake device of the present invention have the following effects.
(1) Since the high-performance filter pack and the medium-performance filter pack are arranged in one filter frame and integrated to form a gas turbine filter unit, the intake device is significantly smaller and lighter.
(2) Since the medium performance filter pack is housed in the high performance filter frame as a gas turbine filter unit, the medium performance filter mounting frame is not required, and the cost of the filter unit can be reduced accordingly.
(3) The filter performance of the medium performance filter and prefilter in the previous stage was selected so that the life of the subsequent high performance filter exceeded the replacement period target in the life design of each filter. By only updating the medium performance filter pack, the high performance filter itself does not need to be replaced until the end of its life.
(4) One stage of filter replacement space is not required, and the housing space can be reduced.
(5) In order to add a high performance filter to an existing gas turbine intake system, it is only necessary to replace the gas turbine filter unit of the present invention in place of the already installed medium performance filter, and no major modification is required. .
(6) When a gas turbine intake device is newly installed, a special mounting frame is not required, and the housing space can be reduced.
(7) Economic effects such as reduction in manufacturing cost of the intake device itself are significant.

Hereinafter, a filter unit for a gas turbine and an intake device according to an embodiment of the present invention will be described with reference to the accompanying drawings 1 to 7.
(Embodiment)
The filter unit 1 includes a high-performance filter pack 2 and a filter frame 5 including upper and lower end frames 3 and left and right side frames 4. The high-performance filter pack 2 is provided inside the filter frame 5. The upper and lower sides of the high-performance filter pack 2 are bonded and sealed to the end frame 3 with a sealing material such as urethane, and the left and right filter media surfaces are also bonded with the adhesive material. The primary air is bonded to the frame 4 and all the primary side air is filtered by the filter pack without leaking.

  The partition frame 6 has a function as a dam when performing adhesive sealing and a function as a secondary contact surface of the medium performance filter pack 7. The end frame 3 and the side frame 4 are adhesive materials, rivets, bolts. Etc. are fixed. The medium performance filter pack 7 is inserted from the opening on the primary side with respect to the structure described above and is brought into contact with the partition frame 6. Thereafter, the holding frame 8 is applied to the medium performance filter pack 7, the latch 9 is rotated, and the latch 9 is inserted into the slit hole 10 provided at a position corresponding to the latch 9 of the side frame 4. Fix 7 with lightly pushed. The above is the structure of the filter unit for gas turbine which consists of a two-stage filter pack.

  In order to measure the transition of the pressure loss of the medium performance filter, it is necessary to measure the pressure between the medium performance filter pack 7 and the high performance filter pack 2, so that the pressure is taken out around the partition frame 6 of the filter frame 5. A mouth 11 is provided. In addition, a filter protection lath net (not shown) may be optionally provided on the secondary side of the high-performance filter pack 2.

  Next, a case where a high performance filter is additionally provided in the conventional gas turbine intake system will be described. FIG. 5 shows a general plan view, and FIG. 6 shows a B-B ′ sectional view thereof. 21 is a weather louver, 22 is a pre-filter (illustrated as a roll-up roll filter), 23 is a medium performance filter, and 24 is a mounting frame for mounting a number of filters in a multi-stage and multi-row state. Here, by replacing the medium performance filter 23 with the gas turbine filter unit 1 composed of a two-stage filter pack, a high performance filter can be added to the conventional gas turbine intake system.

  In general, the external dimensions of the medium performance filter 23 are 610 × vertical 610 × width 290 to 300. Therefore, in the case of the present invention, the maximum depth is 300 mm, but the performance of the intake device is also deteriorated. It is possible to realize a highly efficient gas turbine intake device without causing any trouble.

  Next, an embodiment in which a conventional filter mounting frame is modified and the gas turbine filter unit 1 comprising the two-stage filter pack of the present invention is mounted will be described with reference to FIGS. The conventional mounting bolt 25 to which the medium-performance filter 23 is attached is extended by an increase in the filter depth, but the guide rail 26 when the filter is installed has a secondary center of gravity of the gas turbine filter unit 1 of the present invention. Since it is on the side, it can be temporarily placed when it is inserted into the mounting frame 24, so there is often no need for extension.

  As shown in FIG. 7, the filter unit 1 is placed in the guide rail 26 and is slid into the mounting frame 24 without including the medium performance filter pack 7, and is inserted into the mounting bolt 25 through the pressing plate 27 and 1 of the side frame 4. The abutting mounting nut 28 is tightened and fixed to the next flange portion. In order to prevent leakage from the gasket portion, the four mounting bolts 25 are tightened evenly, and the size of the pressing plate 27 is designed so as not to interfere with the medium performance filter pack 7 and the pressing frame 8 mounted in the filter unit 1. Preferably it is.

  In the present embodiment, one embodiment of the present invention is shown. The present invention is not limited to this embodiment, and the gist of the present invention is not changed at all by changing variously.

In a gas turbine plant, in order to protect and maintain the gas turbine, a housing is provided at the air intake port of the gas turbine plant, and a large number of intake filters are arranged in parallel so that clean air from which dust in the outside air has been removed is taken in. . However, in order to suppress the airflow resistance, that is, the pressure loss when air passes through the filter layer, the number of intake filters has increased and the housing has to be enlarged. Various solutions have been made to solve this problem, but they have not been fully satisfactory.

  Therefore, the present invention is a compact and simple structure intake for a gas turbine, characterized in that two filter packs, a medium performance filter pack and a high performance filter pack, which are stored in a replaceable manner are provided in one filter frame. By trying to provide a filter unit and an air intake device, the present invention can be used to reduce the space for replacing the filter, to make the housing compact, and until the final life of the high-performance filter, the high-performance filter frame The replacement is unnecessary, and the industrial utility value is very high.

It is a top view of the filter unit for gas turbines which shows the example of the present invention. It is A-A 'longitudinal cross-sectional view of FIG. It is a right view of FIG. 2 which shows the secondary side of an airflow direction. It is a left view of FIG. 2 which shows the primary side of an airflow direction. 1 is a schematic plan view showing a general gas turbine intake device. It is a schematic sectional drawing which shows B-B 'of FIG. It is a disassembled perspective view which shows the attachment state of the filter unit of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Filter unit 2 ... High performance filter pack 5 ... Filter frame 7 ... Medium performance filter pack 8 ... Pressure frame 11 ... Pressure extraction port 24 ... Mounting frame 25 ..Mounting bolt 27 ... Presser plate

Claims (6)

  A gas turbine characterized in that a high performance filter pack as a last stage filter is airtightly bonded and fixed in one of the filter frames with a urethane sealant or the like, and a medium performance filter pack is detachably attached to the other. Filter unit.   The high performance filter pack has an efficiency of 90 to 99.99% (according to JIS B 9908 test method type 1) with 0.3 μm particles, and the medium performance filter pack is 65 to 95% (according to JIS B 9908 test method type 2). The gas turbine filter unit according to claim 1, wherein the filter unit has the above efficiency.   The outer dimensions of the filter frame are 550 to 610 × width 550 to 610 × width 300 to 600, and a pressure outlet is provided between the high performance filter pack and the medium performance filter pack housed in the filter frame. The filter unit for a gas turbine according to claim 1.   In the filter life design of each stage, after selecting the filtration performance of the medium performance filter and the pre-filter so that the life of the high performance filter exceeds the replacement target period, the life of the medium performance filter is reduced to 1 / of the life of the high performance filter. The gas turbine filter unit according to claim 1, wherein the gas turbine filter unit is suppressed to 2 or less.   A gas characterized in that a medium-performance filter and a high-performance filter are mounted at one time by inserting the filter unit into each mounting position of the mounting frame and mounting the filter unit to the mounting frame with mounting bolts, etc. Turbine intake system.   When attaching the filter unit to the mounting frame with mounting bolts, the holding plate that holds and holds the filter frame is a size that does not interfere with the holding frame and the medium performance filter pack when inserting and removing the removable medium performance filter pack. The intake device for a gas turbine according to claim 5.

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