JPH08338397A - Impeller washing device of single-shaft multistage centrifugal compressor - Google Patents

Abstract

PURPOSE: To prevent the increase of the axial vibration of a compressor, a partial abrasion and breakage of an impeller, and the like perfectly, by connecting respectively liquid level detecting means to detect the liquid level positions in the downstream side passages respectively, at the positions higher than the connecting positions of the drain pipings of the downstream side passages, and lower than the outer peripheries of the impellers. CONSTITUTION: To the downstream side passage 33a, a level switch 27a being a float arm type magnetic combination type liquid level detecting means is connected through a connection piping 28a. Its connecting position is made higher than the connecting position 33a0 of a downstream side passage 33a and a drain piping 19a, and lower than the outer periphery 13a0 of an impeller 13a. The same manner is applied to the connections of other level switches and the downstream side passages. Consequently, when the drain piping 19a generates a poor exhausting condition, and the washing liquid is stored, to raise the level in the downstream side passage 33a, such a condition can be detected, and as a result, a partial abrasion and breakage of the impeller 13a can be prevented.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to an oil refining plant.
The present invention relates to a single-shaft multi-stage centrifugal compressor for various plants such as for feeding natural gas, and particularly to an impeller cleaning device for a single-shaft multi-stage centrifugal compressor that removes dust adhering to the impeller of the single-shaft multi-stage centrifugal compressor.

[0002]

2. Description of the Related Art For example, in a single-screw multi-stage centrifugal compressor for a petroleum refining plant or for feeding natural gas, a highly efficient compressor is required from the viewpoint of reducing power consumption of the plant. Further, due to the necessity of continuous operation of the plant, continuous operation for a few years is required. To meet the above requirements,
Generally, a turbo compressor using a centrifugal impeller is used as the compressor. At this time, generally the handling gas contains dust, and if this dust adheres to the impeller,
This causes an increase in the imbalance of the impeller and a decrease in the performance of the impeller. Therefore, as one measure for preventing this, there is a configuration in which a filter for preventing dust is provided. However, even if a filter is provided, it is not possible to prevent the adhesion of dust in the long term, and if the filtration accuracy of the filter is too high, it will clog immediately and pressure loss will increase, resulting in a decline in plant capacity. Raise. Therefore, after all, the compressor has to be stopped and disassembled halfway, and maintenance such as cleaning of the impeller must be performed.

In order to solve such long-term dust adhesion, therefore, in recent years, a cleaning liquid injection nozzle has been provided on the suction side of the impeller, and the cleaning liquid is injected from the nozzle during operation of the compressor to produce blades. A structure has been proposed in which dust adhering to the vehicle surface is washed away. Known techniques having such a configuration include, for example, JP-A-63-106400 and JP-A-4-334775.

[0004]

Here, in the structure in which the cleaning liquid is sprayed and the dust is washed out during the operation of the compressor as in the above-mentioned known technique, the cleaning liquid containing the washed dust is discharged between the impeller and the impeller. There is a possibility that the impeller will gradually collect in the flow path and the impeller will come into contact with this accumulated liquid, which will increase the axial vibration of the compressor and cause partial wear / damage of the impeller.
In order to prevent such a situation, normally, a drain pipe is provided in the lower part of the flow path between the impellers, and the valve provided in the drain pipe is always opened during the impeller cleaning. This prevents the cleaning liquid from accumulating in the drain pipe.

However, in such a structure, there are the following problems. That is, even when the drain piping valve is opened during the impeller cleaning,
There is a possibility that the drain pipe may be clogged or the valve may not operate properly, resulting in poor discharge, and the cleaning liquid may gradually accumulate in the drain pipe, and thus in the flow path between the impellers. Therefore, it is difficult to completely prevent the increase of the axial vibration of the compressor and the partial wear and damage of the impeller. In addition, when the cleaning liquid is discharged by opening the valve of the drain pipe, the handling gas of the compressor may be discharged together with the cleaning liquid from the drain discharge port. In a compressor that uses a gas), the cleaning liquid may not be sufficiently discharged from the drain pipe. In this case as well, as in the above case, the cleaning liquid may gradually accumulate in the flow path between the impellers, and it is difficult to completely prevent the increase of the axial vibration of the compressor and the partial wear / damage of the impellers. there were.

A first object of the present invention is to provide an impeller cleaning device for a single-shaft multi-stage centrifugal compressor which can completely prevent an increase in axial vibration of the compressor and partial wear / damage of the impeller. That is.

A second object of the present invention is to reliably prevent the cleaning liquid from accumulating in the flow path of the compressor by providing a means for detecting a defective discharge of the drain pipe, thereby increasing the axial vibration of the compressor and the blades. It is an object of the present invention to provide an impeller cleaning device for a single-shaft multi-stage centrifugal compressor that can completely prevent partial wear and damage of a car.

A third object of the present invention is to provide a means for preventing the handling gas from being discharged to the outside so that the cleaning liquid can be sufficiently discharged from the drain pipe even if the compressor uses the handling gas that cannot be discharged to the outside. An object of the present invention is to provide an impeller cleaning device for a single-shaft multi-stage centrifugal compressor that can completely prevent an increase in axial vibration of a compressor and partial wear and damage of an impeller.

[0009]

In order to achieve the above first and second objects, according to the present invention, a plurality of stages of impellers provided in a single-shaft multistage centrifugal compressor are objects to be cleaned. A cleaning liquid injection nozzle which is provided on the suction side of at least one impeller and injects a cleaning liquid;
At least one provided on the downstream side of each impeller
At least one drain pipe connected to each of the two downstream flow paths and discharging the cleaning liquid sprayed from the cleaning liquid spray nozzle; and at least one drain sluice valve provided in each drain pipe for opening and closing the drain pipe In an impeller cleaning device for a single-shaft multi-stage centrifugal compressor having: and, each downstream flow path is connected to a position higher than the connection position of each drain pipe and lower than the outer circumference of each impeller, and in each downstream flow path. An impeller cleaning device for a single-shaft multi-stage centrifugal compressor is provided, which is provided with at least one liquid level detecting means for detecting the respective liquid level positions.

Further, in order to achieve the above first and third objects, according to the present invention, at least one of a plurality of stages of impellers provided in a single-shaft multistage centrifugal compressor that is a cleaning target.
Cleaning liquid injection nozzles provided on the suction side of the two impellers and injecting the cleaning liquid; respectively connected to at least one downstream side flow path provided on the downstream side of the at least one impeller, and from the cleaning liquid injection nozzles. At least one drain pipe for discharging the sprayed cleaning liquid; and at least one drain sluice valve provided in each drain pipe for opening and closing the drain pipe;
In an impeller cleaning device for a single-shaft multi-stage centrifugal compressor having at least 1,
An impeller cleaning device for a single-shaft multi-stage centrifugal compressor, which has three drain traps.

In order to achieve the above first to third objects, according to the present invention, at least one impeller to be cleaned among a plurality of impellers provided in a single-shaft multi-stage centrifugal compressor. A cleaning liquid injection nozzle that is provided on the suction side and that injects a cleaning liquid; and a cleaning liquid injection nozzle that is connected to at least one downstream side flow path that is respectively provided on the downstream side of the at least one impeller and that is injected from the cleaning liquid injection nozzle An impeller cleaning device for a single-shaft multi-stage centrifugal compressor, comprising: at least one drain pipe for discharging a cleaning liquid; and at least one drain sluice valve provided in the drain pipe for opening and closing the drain pipe,
At least one liquid level detection means that is connected to each downstream side flow path at a position higher than the connection position of each drain pipe and lower than each impeller outer circumference, and that detects the liquid level position in each downstream flow path, respectively; And an at least one drain trap provided in each drain pipe, respectively, and an impeller cleaning device for a single-shaft multi-stage centrifugal compressor.

Preferably, in the impeller cleaning device for the single-shaft multi-stage centrifugal compressor, an alarm is issued when at least one of the liquid surface positions detected by the at least one liquid surface detecting means reaches a predetermined position. There is provided an impeller cleaning device for a single-shaft multistage centrifugal compressor, which further comprises an alarm means.

Further, preferably, in the impeller cleaning device for a single-shaft multi-stage centrifugal compressor, when at least one of the liquid surface positions detected by the at least one liquid surface detecting means reaches a predetermined position, the single shaft There is provided an impeller cleaning device for a single-shaft multistage centrifugal compressor, further comprising trip means for outputting a trip signal for stopping the operation of the multistage centrifugal compressor.

Further preferably, in the impeller cleaning device for the single-shaft multi-stage centrifugal compressor, a cleaning liquid sluice valve which is provided in a supply pipe for supplying the cleaning liquid to the cleaning liquid injection nozzle and which opens and closes the supply pipe; When the valve is opened, each drain sluice valve is opened, and when the cleaning liquid sluice valve is closed, each drain sluice valve is interlocked so as to be closed. An impeller cleaning device for a single-shaft multistage centrifugal compressor is provided.

Further preferably, in the impeller cleaning device for the single-shaft multi-stage centrifugal compressor, at least one drain protection pipe provided so as to branch from each drain pipe so as to bypass each drain sluice valve, and these drain protection pipes There is provided an impeller cleaning device for a single-shaft multistage centrifugal compressor, further comprising at least one drain protection sluice valve which is provided in each drain protection pipe and which opens and closes the drain protection pipe.

More preferably, in the impeller cleaning device for the single-shaft multi-stage centrifugal compressor, there is further provided control means for controlling the opening / closing operation of each drain sluice valve and each drain protection sluice valve, and this control means is , Said at least 1
Until any one of the liquid level positions detected by the one liquid level detecting means reaches a predetermined position, all drain sluice valves are opened and all drain protection sluice valves are closed, When at least one of the liquid surface positions detected by the at least one liquid surface detecting means reaches a predetermined position, the corresponding at least one drain sluice valve is closed and the other drain sluice valves are opened. Blades of a single-shaft multi-stage centrifugal compressor, characterized in that at least one corresponding drain protection sluice valve is kept open and the other drain protection sluice valves are kept closed. A car cleaning device is provided.

[0017]

In the present invention configured as described above, when the cleaning liquid is injected from the cleaning liquid injection nozzle provided on the impeller suction side during operation of the compressor, the cleaning liquid continuously flows into the impeller together with the handling gas. It becomes fine mist and collides with the surface of the impeller to remove dust adhering to the surface of the impeller. Then, with the lapse of time, the removed dust and a part of the cleaning liquid accumulate in each downstream side flow path provided between the next stage, that is, the impeller adjacent to the downstream side.
At this time, drain pipes each having a drain sluice valve are connected to these downstream side flow paths, and the drain sluice valve is opened when the cleaning liquid is jetted from the washing liquid jet nozzle, so that the downstream side The cleaning liquid collected in the flow path is discharged together with dust. If the drain pipe is clogged with dust or other foreign matter, or if the drain sluice valve malfunctions, drainage failure occurs and cleaning liquid containing dust begins to accumulate in the drain pipe. To the downstream side flow path, and the water level gradually rises in the downstream side flow path. However, in the present invention, since the liquid level detection means for detecting the liquid level position in the flow path are respectively connected to predetermined positions higher than the connection position of the drain pipe of the downstream side flow path, the liquid level detection means It is detected that the water level has risen. Therefore, for example, by displaying the rising liquid level position at any time to notify the worker, issuing an alarm to the worker as soon as the predetermined liquid level position is reached, or outputting a trip signal to stop the operation of the entire compressor. Therefore, it is possible to reliably prevent the cleaning liquid from accumulating in the compressor flow path. Therefore, due to the impeller contacting the accumulated liquid, the axial vibration of the compressor is increased and the impeller is partially worn.
Can completely prevent damage. Further, by providing a drain trap in each drain pipe, when the valve of the drain pipe is opened to discharge the cleaning liquid containing dust, the gas handled by the compressor is blocked by the drain trap and is not discharged. Therefore, even with a compressor that uses a handling gas that cannot be released to the outside, such as a gas having toxicity, the cleaning liquid can be sufficiently discharged from the drain pipe. Therefore, it is possible to completely prevent the axial vibration of the compressor from increasing and the partial wear and damage of the impeller due to the contact of the impeller with the accumulated liquid. In addition, when a large amount of the handled gas is discharged from the drain discharge port, it is possible to prevent the gas flow to the impeller in the subsequent stage from decreasing and insufficient cleaning.

Further, the interlocking means is provided with a cleaning liquid sluice valve which is provided in the supply pipe for supplying the cleaning liquid to the cleaning liquid jet nozzle and which opens and closes the supply pipe, and when the cleaning liquid sluice valve is opened, the drain sluice valves are provided. It will be in the open state,
By interlocking each drain sluice valve so that it is closed when the cleaning liquid sluice valve is closed, the drain sluice valve is automatically opened when the cleaning liquid sluice valve is opened during impeller cleaning. The cleaning liquid is discharged so as not to collect in the flow path, and when the cleaning liquid sluice valve is closed at the end of cleaning, the drain sluice valve is automatically closed. Therefore, it is not necessary to operate the drain sluice valve each time cleaning is performed, and the valve operation can be simplified.
It is possible to prevent the cleaning liquid from staying due to forgetting to open the drain sluice valve during cleaning.

Further, at least one drain protection pipe provided so as to be branched from each drain pipe so as to bypass each drain sluice valve, and at least one drain protection pipe provided in each of the drain protection pipes for opening and closing the drain protection pipe. By having two drain protection sluice valves, for example, a drain pipe may become clogged with dust or other foreign matter, or the drain sluice valve may malfunction, causing the water level to rise and be detected by the liquid level detection means. When the liquid level reaches a predetermined position, the drain sluice valve is closed and the corresponding drain protection sluice valve is opened, and the cleaning liquid containing dust can be discharged through the drain protection pipe. Therefore, it is not necessary to interrupt the cleaning work or stop the compressor, the drain protection pipe can be used to continue the discharge, and the drain pipe can be maintained in the meantime.

Further, in the control means for controlling the opening / closing operation of each drain sluice valve and each drain protection sluice valve, any one of the liquid surface positions detected by at least one liquid surface detecting means is set to a predetermined position. Until this is reached, all drain sluice valves are opened and all drain protection sluice valves are closed, and at least one of the liquid surface positions detected by at least one liquid surface detection means is at a predetermined position. When it reaches, the corresponding at least one drain sluice valve is closed and the other drain sluice valves are kept open, and the corresponding at least one drain protection sluice valve is opened. The drain protection valve and the other drain protection sluice valve in the closed state to prevent drainage through the drain pipe and drainage through the drain protection pipe. Switched, it can be performed automatically in.

[0021]

Embodiments of the present invention will be described below with reference to the drawings. A first embodiment of the present invention will be described with reference to FIGS. FIG. 2 is a partial vertical sectional view showing the main part structure of the single-shaft multi-stage centrifugal compressor 50 to which the impeller cleaning device according to this embodiment is applied. In the single-shaft multi-stage centrifugal compressor 50 shown in FIG. 2, the shaft 12 supported by bearings 16a and 16b,
A plurality of stages of impellers 13a fitted to the shaft 12
i and i constitute a rotor. Then, this rotor is rotated by a driving machine (not shown) directly connected through the coupling 15, so that the handling gas flows in from the suction nozzle 11 (or the suction nozzle 14) and the impellers 13a to 13c.
(Or it is sequentially compressed by the impellers 13d to i) and pressure-fed from the discharge nozzle 17 (or the discharge nozzle 18).

The single-axis multi-stage centrifugal compressor 50 is equipped with the impeller cleaning device 100 according to this embodiment.
The impeller cleaning device 100 is provided on the suction side (left side in FIG. 2) of the impeller 13a, and is the cleaning target impeller 13.
a cleaning liquid injection nozzle 22L for injecting the cleaning liquid onto a to d,
Drain pipes 19a connected to the downstream side flow paths 33a to 33c provided on the downstream side of the impellers 13a to 13c, respectively.
To c and drain sluice valves 25a to 25c, which are solenoid valves for opening and closing the drain pipes 19a to 19c, respectively. On the other hand, the impeller cleaning device 100 includes the impeller 13
A cleaning liquid injection nozzle 22R that is provided on the suction side of e (the right side in FIG. 2) and injects the cleaning liquid to the impellers 13e to 13i to be cleaned, and a downstream flow that is provided on the downstream side of the impellers 13e to 13h. The drain pipes 19e to h connected to the passages 33e to h, and the drain sluice valve 25e, which is a solenoid valve for opening and closing the drain pipes 19e to h, respectively.
~ H.

FIG. 1 shows a detailed structure in the vicinity of the drain pipe 19a in the structure of the impeller cleaning device 100 as described above. In FIG. 1, a float arm type magnetic coupling type level switch 27a for detecting the liquid surface position in the downstream side flow passage 33a is connected to the downstream side flow passage 33a through a connection pipe 28a, and the connection position thereof is set. Is higher than the connection position 33a _o between the downstream side flow passage 33a and the drain pipe 19a and lower than the outer peripheral portion 13a _{o of the} impeller 13a.

Connection pipe 28 near the level switch 27a
FIG. 3 shows the structure of a, and FIG. 4 shows the internal structure and operating state of the level switch 27a. 3 and 4, the level switch 27a includes a float 27a ₁ that projects into the connecting pipe 28a and floats at the liquid surface position, and the float 27a ₁ is provided at one end and a fulcrum 27.
a shaft 27a ₂ which is rotatably supported on a _3, a magnet 27a ₄ provided on the other end of the shaft 27a _2, provided the magnet 27a ₄ opposite to the position in a state where the shaft 27a ₂ becomes horizontal position And a proximity switch 27a ₅ that is installed. And the connection pipe 28a
Liquid level position inside (that is, liquid level position of the downstream side flow path 33a)
Moves up to a predetermined position, and when the shaft 27a ₂ reaches a horizontal position, the magnet 27a ₄
By this action, the proximity switch 27a ₅ is turned on, and an alarm signal is transmitted to the alarm device 60 (see FIG. 1).

Returning to FIG. 1, a drain trap 26a is provided downstream of the drain sluice valve 25a in the drain pipe 19a.
Is provided. A supply pipe 32L for supplying the cleaning liquid is connected to the cleaning liquid injection nozzle 22L, and the supply pipe 32L is provided with a cleaning liquid sluice valve 23L which is an electromagnetic valve for opening and closing the supply pipe 32L. .

Although the detailed structure near the drain pipe 19a has been shown above, the other drain pipes 19b, 19c, 19e to h are shown.
Has the same structure. That is, although not particularly shown, the downstream side flow passages 33b, 33c, 33e to h have the same connection pipes 28b, 28c, 28e to the connection pipe 28a.
level switches 27b, 27c, 27e to h via h
Are connected, and drain pipes 19b, 19c, 19e
The drain traps 26b, 26c, 26e to h similar to the drain trap 26a are provided on the downstream side of the drain gate valves 25b, 25c, 25e to h.
Then, the supply pipe 32L is attached to the cleaning liquid injection nozzle 22R.
A supply pipe 32R similar to the above is connected, and the supply pipe 32R is provided with a cleaning liquid sluice valve 23R similar to the cleaning liquid sluice valve 23L. The level switches 27b, 27c, and 27e to h have the same structure as the level switch 27a shown in FIGS. 3 and 4, and the liquid level positions in the connecting pipes 28b, 28c, and 28e to h rise, and the shafts When the is in the horizontal position, the proximity switch is turned on by the action of the magnet, and the alarm device 60
Send an alarm signal to.

The alarm device 60 receives the alarm signal from at least one of the level switches 27a-c and e-h, that is, the downstream flow path 33a-.
When at least one of the liquid level positions c, e to h reaches a predetermined position, a warning is issued to the worker. Further, the cleaning liquid sluice valves 23L and R provided in the supply pipes 32L and R, and the drain pipes 19a to 19a.
Drain sluice valves 25a to 25e
The valves c and 25e to 25e are electrically linked with each other via an electric interlocking device (not shown), and when the cleaning liquid sluice valve 23L (or 23R) is in an open state, it is a drain sluice. The valves 25a to 25c (or 25e to h) are also in the open state, and the cleaning liquid sluice valve 23L (or 23R).
When the valve is closed, the drain sluice valves 25a to 25c
(Or 25e to h) are also closed.

In the above structure, the single-shaft multistage centrifugal compressor 5
23L (or 23R) sluice valve for cleaning liquid during 0 operation
When the cleaning liquid is sprayed from the cleaning liquid spray nozzle 22L (or 22R) by opening the
3a-d (or 13e-i) continuously flows into a fine mist, collides with the surface of the impellers 13a-d (or 13e-i), and removes the attached dust. Then, with the passage of time, the removed dust and a part of the cleaning liquid accumulate in each of the downstream side flow passages 33a to 33c (or 33e to h). At this time, these downstream side flow paths 33a to 33c
(Or 33e to h) are drain sluice valves 25a to 25c.
(Or 25e to h) are connected to the drain pipes 19a to 19c (or 19e to h), respectively, and the electric interlocking device is used for the drain by interlocking with the opened state of the cleaning liquid sluice valve 23L (or 23R). By opening the partition valves 25a to 25c (or 25e to h) as well, the cleaning liquid accumulated in the downstream flow paths 33a to 33c (or 33e to h) is discharged together with dust. This eliminates the need to operate the drain sluice valves 25a to 25c (or 25e to h) each time the washing is performed, and simplifies the valve operation, and the drain sluice valves 25a to 25c (or 25e to h) at the time of washing can be It is possible to prevent the cleaning liquid from staying due to forgetting to open it. Here, dust or other foreign matter is clogged in the drain pipes 19a to 19c (or 19e to h), and the drain sluice valves 25a to 25c.
If (or 25e to h) fails, the drain pipes 19a to c (or 19e to h) begin to collect cleaning liquid containing dust due to poor discharge, and drain pipes 19a to c (or 19e to h) to the downstream side flow path 3
3a to c (or 33e to h), and the water level gradually rises in the downstream side channels 33a to c (or 33e to h). Here, in the impeller cleaning device 100 of the present embodiment, the level switches 27a to c (or 27e to h) are connected to the downstream pipes 33a to c (or 33e) via the connecting pipes 28a to c (or 28e to h). To h), the water level rises to a predetermined liquid level position and at the same time an alarm device 60
The alarm device 60 outputs an alarm signal to the worker and issues an alarm to the worker accordingly. Therefore, when the worker interrupts the cleaning operation or stops the compressor 50 accordingly, the cleaning liquid is supplied to the downstream side flow passages 33a to 33c (or 3) of the compressor 50.
3e to h) can be reliably prevented from accumulating. Further, the drain trap 2 is connected to the drain pipes 19a to 19c (or 19e to h).
By providing 6a to c (or 26e to h), when the drain pipe sluice valves 25a to 25c (or 25e to h) are opened to discharge the cleaning liquid containing dust, the gas handled by the compressor 50 is a drain trap. 26a-c (or 26e
It is blocked by ~ h) and is not discharged outside. Therefore, even in the compressor 50 that uses a handling gas that cannot be released to the outside, such as a gas having toxicity, the cleaning liquid can be sufficiently discharged from the drain pipes 19a to 19c (or 19e to h). Due to the above two factors, the vibration of the shaft 12 of the compressor 50 is increased and the impellers 13a to 13i are partially worn or damaged due to the impellers 13a to 13d (or 13e to i) coming into contact with the accumulated liquid. Can be completely prevented. Also, the drain traps 26a to 26c
(Or 26e to h) also has an effect that when a large amount of the handled gas is discharged from the drain discharge port, it is possible to prevent the gas flow to the impeller in the subsequent stage from decreasing and insufficient cleaning.

In the first embodiment, when the liquid level of at least one of the downstream flow paths 33a to 33c to 33e to h reaches a predetermined position, the alarm device 60 notifies the worker. Although an alarm was issued, it is not limited to this. That is, instead of the alarm device 60, an alarm signal may be input to the trip device, and the trip device may output the trip signal to the compressor 50 in response to the alarm signal to stop the operation of the compressor 50 itself. . Further, in the first embodiment, the so-called float arm type magnetic coupling type level switches 27a to 27c are used, but the present invention is not limited to this, and the metal tube type level switch and the displacer type spring balanced type level switch are used. It is also possible to use other types of level switches, such as float type rod-coupled level switches, magnetic float type magnetically coupled level switches, float arm bellows type level switches, float type magnetically coupled level switches, etc. Get the same effect. Further, in the first embodiment, the drain traps 26a to 26c and e to h are connected to the drain pipe 1.
9a-c, e-h drain sluice valves 25a-c, e-
Although it is provided on the downstream side of h, it is not limited to this and may be provided on the upstream side of the drain sluice valves 25a to 25c and 25 to 25h. Also in this case, the same effect is obtained.

A second embodiment of the present invention will be described with reference to FIGS. The present embodiment is an example in which a drain protection pipe is provided so as to branch from the drain pipe, and when the drain pipe is not properly discharged, the drain protection pipe is switched to discharge the cleaning liquid.
The same members as those in the first embodiment are designated by the same reference numerals. The drain pipe 19a of the impeller cleaning device 200 according to the present embodiment.
The detailed structure in the vicinity is shown in FIG. FIG. 5 is a diagram corresponding to FIG. 1 in the first embodiment. In FIG. 5, the main difference between the impeller control device 200 of the present embodiment and the impeller control device 100 of the first embodiment is that the drain sluice valve 2 is used.
Based on a signal from a drain protection pipe 219a provided by branching from the drain pipe 19a so as to bypass 5a, a drain protection sluice valve 225a which is a solenoid valve for opening and closing the drain protection pipe 219a, and a level switch 27a. , Drain sluice valve 25a and drain protection sluice valve 2
And a controller 250 for controlling the opening / closing operation of 25a. At this time, the other drain pipes 19b, 19c, and 19e to h also have the same structure, and although not particularly shown, the drain protection pipe 219b,
219c, 219e-h are drain sluice valves 25b, 2
Drain pipe 19b, so as to bypass 5c and 25e to h
The drain protection pipes 219b, 219c, and 219e to h are branched from the drain protection pipes 219b, 219c, and 219e to h. The drain protection sluice valve 225b is a solenoid valve that opens and closes the drain protection pipes 219b, 219c, and 219e to h. 225
c, 225e-h are provided. Then, the controller 250 also controls the level switches 27b, 27c, 2
Drain sluice valve 25 based on signals from 7e to 7h
b, 25c, 25e to h and drain protection gate valve 225
The opening / closing operations of b, 225c, and 225e to h are controlled. Further, at this time, the controller 250 controls the supply pipe 32L,
The opening / closing operation of the cleaning liquid sluice valves 23L and 23R provided in R is also configured to be controlled.

FIG. 6 is a flowchart showing the control contents of the controller 250. In FIG. 6, first, in step 301, an opening signal for opening the cleaning liquid sluice valves 23L, R is output, the supply pipes 32L, R for supplying the cleaning liquid are opened, and the cleaning liquid is discharged from the nozzles 22L, R. Make it jet. Next, in step 302, an open signal for opening the drain sluice valves 25a to 25c and 25h to 25h is output to open the drain pipes 19a to 19c and 20h.

Then, in step 303, the level switch 2
The signals from 7a to 7c and 7h to 7h are fetched, and the procedure proceeds to step 304 to determine whether or not an alarm signal is output from any of the level switches 27a to 27c and e to h. If no alarm signal is output, all drain pipes 19a-
It is determined that c, e to h are functioning normally, and the procedure 303
Return to and repeat the same procedure. At this time, if at least any one of the level switches 27a to c and e to h outputs an alarm signal indicating a defective discharge of the drain pipes 19a to 19c and e to h, the process proceeds to step 305 and the discharge is performed. An open signal for opening the drain protection sluice valves 225a-c, eh of the drain protection pipes 219a-c, eh branching from the defective drain pipes 19a-c, eh is output. The cleaning liquid accumulated thereby is discharged through the drain protection pipes 219a to 219c and eh.

After that, the procedure proceeds to step 306, where a closing signal is output to close the drain sluice valves 25a to 25c and 25h to 25h of the drain pipes 19a to 19c and eh which are defectively discharged. End the flow.

The configuration other than the above is almost the same as that of the impeller cleaning device 100 of the first embodiment.

The same effect as that of the first embodiment can be obtained by the present embodiment having the above-mentioned structure. In addition to this, for example, drain pipes 19a to 19c, e to h
Dust or other foreign matter is clogged inside, or the drain sluice valves 25a to 25c and 25 to 25 are damaged, and the downstream side flow passage 3
3a to c, e to h (see FIG. 2), and when the liquid level positions detected by the level switches 27a to c, e to h reach a predetermined position, the steps 305 and 306 are automatically performed. The drain protection sluice valves 225a to 225c, eh corresponding to the location where the abnormality has occurred are opened and the drain sluice valves 25a to 25c, eh are closed, and the discharge path is switched to change the cleaning liquid containing dust. Drain protection pipe 2
It can be discharged via 19a-c, 19e-h. Therefore, drainage can be continued using the drain protection pipes 219a-c, eh without interrupting the cleaning work or stopping the compressor 50, and the drain pipes 19a-
Maintenance of c, e to h can be performed.

In the first and second embodiments described above, all the impellers 13a to 13i provided in the single-shaft multistage centrifugal compressor 50 are to be cleaned, but the present invention is not limited to this and at least It is enough to wash one impeller,
It suffices if the cleaning liquid injection nozzle is provided on the suction side of the impeller to be cleaned. And in these cases, the same effect is obtained.

[0037]

According to the present invention, since the liquid level detecting means for detecting the liquid level position in the flow path is connected to a predetermined position higher than the connection position of the drain piping in the downstream flow path, the drain piping is connected. When the water is discharged poorly and the cleaning liquid is accumulated and the water level rises in the downstream side flow path, this can be detected. Therefore, for example, by displaying the rising liquid level position at any time to notify the worker, issuing an alarm to the worker as soon as the predetermined liquid level position is reached, or outputting a trip signal to stop the operation of the entire compressor. Therefore, it is possible to reliably prevent the cleaning liquid from accumulating in the compressor flow path. Further, since a drain trap is provided in each drain pipe, even a compressor using a handling gas that cannot be released to the outside, such as a gas having toxicity, can sufficiently discharge the cleaning liquid from the drain pipe. As described above, it is possible to completely prevent the axial vibration of the compressor from increasing and the impeller from being partially worn or damaged due to the impeller contacting the accumulated liquid.

[Brief description of drawings]

FIG. 1 is a partial vertical sectional view showing a detailed structure near a drain pipe of an impeller cleaning device according to a first embodiment of the present invention.

FIG. 2 is a partial vertical cross-sectional view showing the main part structure of a single-shaft multi-stage centrifugal compressor to which the impeller cleaning device shown in FIG. 1 is applied.

FIG. 3 is a cross-sectional view showing a piping structure near the level switch shown in FIG.

FIG. 4 is a diagram illustrating an internal structure and an operating state of the level switch shown in FIG.

FIG. 5 is a partial vertical sectional view showing a detailed structure near a drain pipe of an impeller cleaning device according to a second embodiment of the present invention.

FIG. 6 is a flowchart showing control contents by the controller shown in FIG.

[Explanation of symbols]

13a-i Impeller 19a-c, e-h Drain piping 22L, R Cleaning liquid injection nozzle 23L, R Cleaning liquid sluice valve 25a-c, e-h Drain sluice valve 26a-c, e-h Drain trap 27a-c , E to h level switch (liquid level detection means) 28a to c, e to h connection piping 33a to c, e to h downstream flow path 50 single-axis centrifugal multi-stage compressor 60 alarm device 100 impeller cleaning device 200 impeller cleaning Device 219a-c, e-h Drain protection pipe 225a-c, e-h Drain protection gate valve 250 Controller

Claims (8)

[Claims] 1. A cleaning liquid injection nozzle for injecting a cleaning liquid, the cleaning liquid injection nozzle being provided on a suction side of at least one impeller to be cleaned among a plurality of stages of impellers included in a single-shaft multi-stage centrifugal compressor; At least one drain pipe that is connected to at least one downstream flow passage that is provided on the downstream side of each impeller and that discharges the cleaning liquid injected from the cleaning liquid injection nozzle, respectively; In an impeller cleaning device for a single-shaft multi-stage centrifugal compressor having at least one drain sluice valve that opens and closes the drain pipe, in each downstream side flow path, a position higher than a connection position of each drain pipe and an outer periphery of each impeller. At least one liquid level detecting means is provided which is connected to each lower position and detects the liquid level position in each downstream flow path. DOO impeller cleaning device single-shaft multistage centrifugal compressor according to claim. 2. A cleaning liquid injection nozzle for injecting a cleaning liquid, the cleaning liquid injection nozzle being provided on a suction side of at least one impeller to be cleaned among a plurality of stages of impellers provided in the single-shaft multi-stage centrifugal compressor; At least one drain pipe that is connected to at least one downstream flow passage that is provided on the downstream side of each impeller and that discharges the cleaning liquid injected from the cleaning liquid injection nozzle, respectively; An impeller cleaning device for a single-shaft multistage centrifugal compressor, comprising: at least one drain sluice valve that opens and closes the drain pipe; and at least one drain trap provided in each drain pipe. Impeller cleaning device for single-axis multi-stage centrifugal compressor. 3. A cleaning liquid injection nozzle for injecting a cleaning liquid, the cleaning liquid injection nozzle being provided on a suction side of at least one impeller to be cleaned among a plurality of stages of impellers provided in a single-shaft multi-stage centrifugal compressor; At least one drain pipe that is connected to at least one downstream flow passage that is provided on the downstream side of each impeller and that discharges the cleaning liquid injected from the cleaning liquid injection nozzle, respectively; In an impeller cleaning device for a single-shaft multi-stage centrifugal compressor having at least one drain sluice valve that opens and closes the drain pipe, in each downstream side flow path, a position higher than a connection position of each drain pipe and an outer periphery of each impeller. At least one liquid level detection means that is connected to each of the lower positions and that detects the liquid level position in each downstream flow path; At least one drain trap provided respectively down pipe, impeller cleaning device single-shaft multistage centrifugal compressor and having a. 4. The impeller cleaning device for a single-shaft multi-stage centrifugal compressor according to claim 1, wherein at least one of the liquid surface positions detected by the at least one liquid surface detecting means reaches a predetermined position. An impeller cleaning device for a single-shaft multi-stage centrifugal compressor, further comprising alarm means for issuing an alarm. 5. The impeller cleaning device for a single-shaft multi-stage centrifugal compressor according to claim 1 or 3, when at least one of the liquid surface positions detected by the at least one liquid surface detecting means reaches a predetermined position. The impeller cleaning device for a single-shaft multi-stage centrifugal compressor, further comprising trip means for outputting a trip signal for stopping the operation of the single-shaft multi-stage centrifugal compressor. 6. The impeller cleaning device for a single-shaft multi-stage centrifugal compressor according to claim 1, wherein the cleaning liquid is provided in a supply pipe for supplying the cleaning liquid to the cleaning liquid injection nozzle and opens and closes the supply pipe. Interlocking so that when the cleaning liquid sluice valve is opened, each drain sluice valve is opened, and when the cleaning liquid sluice valve is closed, each drain sluice valve is closed. An impeller cleaning device for a single-shaft multi-stage centrifugal compressor, further comprising: 7. The impeller cleaning device for a single-shaft multi-stage centrifugal compressor according to claim 1, wherein at least one drain protection is provided by branching from each drain pipe so as to bypass each drain sluice valve. An impeller cleaning device for a single-shaft multi-stage centrifugal compressor, further comprising: a pipe; and at least one drain protection sluice valve provided in each of the drain protection pipes to open and close the drain protection pipe. 8. The impeller cleaning device for a single-shaft multi-stage centrifugal compressor according to claim 7, further comprising control means for controlling opening / closing operation of each drain sluice valve and each drain protection sluice valve, and this control. The means opens all drain sluice valves and opens all drain sluice valves until any one of the liquid surface positions detected by the at least one liquid surface detection device reaches a predetermined position. When at least one of the liquid surface positions detected by the at least one liquid surface detecting means reaches a predetermined position, the corresponding at least one drain sluice valve is closed and other The drain sluice valve is kept open, and at least one corresponding drain protection sluice valve is opened and the other drain protection sluice is opened. An impeller cleaning device for a single-shaft multi-stage centrifugal compressor, characterized in that the valve is kept closed.