JPH0538398U - Axial compressor - Google Patents

Abstract

(57) [Abstract] [Purpose] To improve the cleaning effect, enable cleaning during operation, and avoid low efficiency operation that ignores economic efficiency. [Structure] A vertical hole 4 is formed in the first stationary blade 1 from the blade shaft 2 to a position near the tip of the blade 3, and a plurality of axial holes 5 communicating from the downstream side of the blade 3 to the vertical hole 4 are formed. To drill. Second
A vertical hole 10 extending from the blade shaft 8 to the root of the base 9
And the wing bases 9 on both the back side and the ventral side of the wing 11
From this, a hole 12 communicating with the vertical hole 10 is bored from the downstream side of the second stationary blade 7 in the oblique direction. The first and second stationary vanes 1 and 7 are distributed and attached to the casing of the axial flow compressor.
Then, a cleaning liquid pipe is connected to the vertical holes 4 and 10 of each of the stationary blades 1 and 7, and the cleaning liquid is ejected from the holes 5 and 12.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an axial compressor, and more particularly, to an interstage cleaning structure for an axial compressor.

[0002]

[Prior Art]

 In recent years, as the size of plants has increased, the use of axial flow machines has increased, and the number of products handling special gases other than air has also increased. Under such circumstances, early deterioration of performance due to the progress of air pollution or corrosion due to special gas have been raised as new problems.

Generally, there are various types of axial flow machines, such as an axial flow compressor, an axial flow blower, a power recovery turbine, and the like. When the axial flow compressor is taken as an example, when a blade is contaminated or corroded. Will have reduced performance. However, in an air compressor, it is said that the performance deterioration due to blade contamination is reduced by about 2 to 3% in efficiency, and the reduction of the flow rate is about 3 to 4%. In addition, in a steam compressor for pressurized salt production or a compressor that handles corrosive gas in a chemical plant, the blade surface becomes rough due to blade corrosion up to about 2 to 3 stages on the suction side, and the performance deteriorates. ..

As a current countermeasure against such a phenomenon, in an axial-flow compressor that handles air, walnut shell grains, rice and the like are sucked in while the compressor is rotating, or when the compressor is released, I take out the ta and wash the wings. In addition, for axial compressors, recovery turbines, etc. that handle special gases other than air, currently there is no other means than cleaning at the time of release.

[0005]

[Problems to be solved by the device]

 Conventionally, in such an axial compressor that handles air, walnut shell grains and rice are sucked during operation, but walnut shell grains and rice are solid. For this reason, it is not evenly distributed on the blade surface along the flow, only partial dirt removal is possible, no remarkable recovery of performance can be expected, and if it is necessary to collect on the wake side depending on the supply destination. There was also.

Further, in the axial compressor that handles a special gas other than air, until the time of the regular inspection, the compressor having deteriorated performance had to be operated without regard to economy.

The present invention has been made in order to solve the problems of the prior art as described above. The cleaning effect can be improved, cleaning can be performed during operation, and low-efficiency operation that ignores economical efficiency can be achieved. It is an object of the present invention to provide an axial flow compressor that does not require it.

[0008]

[Means for Solving the Problems]

 In order to solve the above problems, an axial flow compressor according to the present invention has a vertical hole extending from the blade shaft to the vicinity of the blade tip, and a plurality of axial holes communicating with the vertical hole from the downstream side. The first stationary blade that was installed and a vertical hole from the blade axis to the root of the wing base were drilled, and holes that communicate with the vertical holes from the wing bases on both the back side and the ventral side were made oblique from the downstream side. And a second stator vane facing toward the casing. The first and second stator vanes are distributed and attached to the casing.

[0009]

[Action]

 According to the above means, if a cleaning liquid pipe such as a flexible tube is connected to the vertical hole of the first stator vane attached to the casing of the axial compressor from the outside of the compressor, the cleaning liquid will pass through the vertical hole. From the axial hole communicating with the vertical hole, the jet is uniformly sprayed on the rotor blade surface of the rotor along the flow of air. Similarly, if the cleaning liquid pipe is connected to the vertical hole of the second vane, the cleaning liquid is obliquely jetted from the hole that extends obliquely from the downstream side through the vertical hole. By distributing and installing the stationary blades having two types of holes in the casing in this way, the surface of the rotor blade that is difficult to clean is also effectively cleaned.

Further, the cleaning liquid that has passed through the surface of the moving blade then flows to the surface of the stationary blade of the next stage and cleans the surface of the stationary blade as well. Then, the cleaning liquid after cleaning becomes vapor by compression heat or is discharged as drain. In addition, the cleaning liquid acts as a gas cooling liquid, and a side effect of reducing power is also obtained.

[0011]

【Example】

 Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. 1 (a) is a front view of a first cross section of a first stator vane used in the axial compressor according to the present embodiment, and FIG. 1 (b) is a side view of the same second stator vane. Is a plan view of the first vane, and FIG. 3 is a front view of the second vane.

According to this embodiment, as shown in FIGS. 1A and 2, the first vane 1 has a vertical hole 4 extending from its blade axis 2 to the vicinity of the tip of the blade 3. A plurality of axial holes 5 communicating with the vertical holes 4 from the downstream side of the blade 3 are formed so as to be orthogonal to the vertical holes 4. In addition, the code | symbol 6 shows a wing.

Further, as shown in FIGS. 1B and 3, the second stationary blade 7 is provided with a vertical hole 10 extending from its blade axis 8 to the root of the blade base 9. Holes 12 communicating with the vertical holes 10 from the wing bases 9 on both the back side and the ventral side of the blade 11 are bored obliquely from the downstream side of the second stationary blade 7.

Then, the first and second stationary vanes 1 and 7 configured as described above are distributed and attached to the casing (not shown) of the axial flow compressor. The position of the openings should be decided appropriately according to the velocity distribution and boundary layer distribution of the ventral side, the dorsal side, and other blade surfaces, and it is not always necessary to construct all the stationary blade rows.

In the above configuration, if a cleaning liquid pipe (not shown) such as a flexible tube is connected to the vertical hole 4 of the first stationary blade 1 from the outside of the compressor, the cleaning liquid will flow through the vertical hole 4. Through the axial hole 5 that communicates with the vertical hole 4, the gas is evenly injected along the flow of gas onto the rotor blade surface. Similarly, if a cleaning liquid pipe is connected to the vertical hole 110 of the second vane 7, the cleaning liquid is jetted obliquely through the vertical hole 10 and the hole 12 extending obliquely from the downstream side. It By thus distributively mounting the first and second stationary blades 1 and 7 having the two types of holes in the casing, the surfaces of the blades that are hard to be cleaned can be effectively cleaned.

On the other hand, the cleaning liquid that has passed through the surface of the moving blade is flown to the surface of the stationary blade of the next stage to clean the surface of the stationary blade, and thereafter, the cleaning liquid becomes vapor due to the compression heat or the drain. Is discharged as. In addition, the cleaning liquid acts as a cooling liquid for the gas and has a secondary effect of reducing the power.

[0017]

[Effect of the device]

 As described above, according to the axial compressor of the present invention, the cleaning liquid is sprayed in the gas flow direction, so that the cleaning water is uniformly distributed on the blade surface. .. Therefore, in addition to the improved cleaning effect, the partial jetting is also performed, which makes it possible to clean the surface of the rotor blade that is difficult to clean. In addition, the cleaning liquid that has passed through the surface of the moving blade then comes to the surface of the next stage stationary blade to clean the surface of the stationary blade. As a result, cleaning can be performed during operation regardless of whether an axial compressor that handles air or an axial compressor that handles a special gas is used, resulting in remarkable effects such as avoiding low-efficiency operation that ignores economic efficiency. ..

[Brief description of drawings]

FIG. 1 (a) is a half sectional front view of a first vane used in an axial compressor according to an embodiment of the present invention, and FIG. 1 (b) is a side view of the second vane. .

FIG. 2 is a plan view of the first vane.

FIG. 3 is a front view of the second vane.

[Explanation of symbols]

 1 First stationary blade 2 Blade axis 3 Blade 4 Vertical hole 5 Axial hole 7 Second stationary blade 8 Blade axis 9 Blade 10 Vertical hole 11 Blade 12 hole

Claims (1)

[Scope of utility model registration request] 1. A first stator blade having a vertical hole extending from the blade shaft to the vicinity of the blade tip and a plurality of axial holes communicating from the downstream side to the vertical hole, and a blade shaft to a blade base. And a second stator vane in which a vertical hole reaching the root of the vertical hole is bored, and holes communicating with the vertical hole from the blades on both the back side and the ventral side are bored obliquely from the downstream side. An axial flow compressor characterized in that the first and second stationary vanes are distributed and attached to a casing.