JPH10252688A - Centrifugal compressor device and operation method therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the size of an oil film seal type shaft seal device used in a multistage centrifugal compressor and to improve reliability of the device. SOLUTION: Shaft seal devices 31 to prevent leakage of working gas is arranged at the two end parts of a centrifugal compressor body. Shaft seal oil a flow rate of which is regulated by a regulation valve 4 is fed from an oil reservoir tank 16 to the shaft seal device 31. A shaft seal device 31 is coupled to the upper part of a seal oil head tank 13 and meanwhile, the lower part of the tank 13 is coupled through a shield valve 12 to the outlet side of a regulation valve 4 through a piping 18. When the temperature of exhaust oil discharged from the shaft seal device 31 exceeds a threshold, working gas is pushed back by utilizing a head of shaft seal oil in the head tank 13, and leakage of working gas from a compressor body is prevented from occurring.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a centrifugal compressor device and a method of operating the same, and more particularly, to a multi-stage centrifugal compressor device and a method of operating the same.

[0002]

2. Description of the Related Art In a centrifugal compressor for handling ignitable gas or harmful gas, a seal ring for preventing leakage of gas to the outside of a casing is used as a shaft sealing mechanism. This shaft sealing mechanism includes a seal ring on the atmosphere side and a seal ring on the gas side, and supplies oil between the respective rings and the sleeve to prevent gas from leaking to the outside. An oil supply device is provided for supplying the oil.

[0003] An example of an oiling method used for a shaft sealing mechanism of a centrifugal compressor device which is generally used is an A.P.
API Standard 614, "Lu
bri-cation, Shaft-Sealing, and Control-Oil Systems
for Special-Purpose Appl-ications ", Third Editio
n, August 1992, American Petroleum Institute) at pages 42 and 49. In this prior art, the oil pressurized by an oil pump is supplied through an oil cooler and an oil filter, after the amount of oil is adjusted by a control valve, to a necessary amount to a seal ring. In addition, a predetermined amount of oil is stored in the seal oil head tank, and a pipe for handling gas is connected to the upper part of the head tank so that the pressure inside the tank is always equal to the gas pressure. It is installed at an appropriate position vertically higher than the sealing mechanism.

Another example of a shaft sealing mechanism of a centrifugal compressor device is described in Japanese Patent Application Laid-Open No. 5-195988. In this publication, an oil supply line and an oil drain line for cooling the atmosphere-side seal ring are further provided in the shaft sealing mechanism, and cooling oil is supplied to the atmosphere-side float ring.

[0005]

In the shaft sealing mechanism used in the above-mentioned conventional multistage centrifugal compressor device, the differential pressure between the shaft sealing oil and the working gas supplied to the seal ring provided on the gas side is set to a predetermined pressure. The oil head tank for sealing is installed at an appropriate position vertically higher than the shaft sealing mechanism of the centrifugal compressor device. As a result, the liquid level inside the tank is maintained at a fixed position, and a predetermined differential pressure is generated. As a result, the amount of oil flowing through the seal ring is controlled to be substantially constant even if the pressure of the working gas fluctuates.

Since the pressure difference between the pressure of the shaft sealing oil and the atmospheric pressure is applied to the seal ring on the atmosphere side, when the pressure of the working gas fluctuates, the pressure of the supply shaft sealing oil also changes, and the pressure on the atmosphere side is changed. The amount of oil flowing through the seal ring changes greatly. FIG. 3 shows an example of the relationship between the pressure (supply pressure) of the shaft sealing oil, the oil discharge temperature of the atmosphere-side seal ring, and the oil flow rate. As is clear from FIG. 3, when the supply pressure of the shaft sealing oil is low, the oil discharge temperature increases, and when the supply pressure is high, the oil discharge temperature decreases but the oil amount increases.

[0007] In a centrifugal compressor device in which the fluctuation width of the working gas pressure is large, if the gap between the atmosphere side seal ring and the sleeve is reduced, the oil discharge temperature increases when the pressure of the working gas decreases, and the seal ring Burnout limit value T1
Cause the risk of exceeding Conversely, if the gap is increased, the oil amount increases to the amount represented by Q2 when the pressure of the working gas increases, and it is necessary to increase the size of the oil pump and the tank. For this reason, it has been difficult to apply the oil film seal to a centrifugal compressor device in which the pressure fluctuation of the working gas is large.

In order to make the oil film seal applicable to a centrifugal compressor device having a large pressure fluctuation, for example, in Japanese Patent Application Laid-Open No. 5-1959887, a temperature controller is connected to the oil drain line of the atmosphere side float ring. And a new oil supply line and oil drain line are provided to cool the atmosphere side float ring when the oil drain temperature exceeds the limit value. Then, a control valve is attached to both lines, and a signal for lowering the drain oil temperature is sent from the temperature controller to the control valve. However, in the apparatus described in this publication, it is necessary to newly provide an oil supply line and an oil discharge line, and it is necessary to equip the seal housing of the centrifugal compressor device with an internal pipe for cooling. The structures of the device and the refueling device are complicated.

SUMMARY OF THE INVENTION An object of the present invention is to provide a centrifugal compressor device having a shaft sealing system capable of sealing a working gas with a simple structure and a method of operating the same. It is another object of the present invention to provide a centrifugal compressor device provided with a shaft sealing system that enhances the reliability of a seal for a working gas and a method of operating the same. Still another object of the present invention is to provide a centrifugal compressor device in which components such as an oil supply pump and a tank constituting a shaft sealing system of the centrifugal compressor device are miniaturized, and a method of operating the centrifugal compressor device. Another object of the present invention is to prevent burning of a seal ring used in a shaft sealing system of a centrifugal compressor device.

[0010]

According to a first aspect of the present invention, there is provided a centrifugal compressor having at least one centrifugal impeller, and a suction port provided in the centrifugal compressor. Centrifugal compressor device provided with shaft sealing means for preventing leakage of working gas discharged from the discharge port from the centrifugal compressor main body, oil supply means for supplying oil to the shaft sealing means, and shaft sealing means Detecting means for detecting the temperature of oil discharged from the oil supply means, pressurizing means for pressurizing oil flowing through the oil supply means, and control for controlling the flow rate and pressure of oil flowing through the oil supply means based on the output of the detection means Means.

According to a second aspect of the present invention, there is provided a rotary shaft, at least one centrifugal impeller mounted on the rotary shaft, and both ends of the rotary shaft supporting the rotary shaft. And a casing surrounding the centrifugal impeller; a centrifugal compressor main body; and a working gas compressed by the centrifugal compressor main body is prevented from leaking from the centrifugal compressor main body. A centrifugal compressor device provided with a shaft sealing means provided in the shaft sealing oil supply means for supplying shaft sealing oil to the shaft sealing means, a control valve for controlling the amount of oil of the shaft sealing oil, A head tank disposed in the shaft sealing oil supply means via an on-off valve to pressurize the shaft sealing oil supplied by the oil supply means, and a temperature for detecting a temperature of the shaft sealing oil discharged from the shaft sealing means. Detecting means, and controlling based on the temperature detected by the temperature detecting means. It is provided with a control means for controlling the valve.

Preferably, the control device controls the control valve so as to increase the flow rate of the shaft sealing oil when the temperature detected by the temperature detection means rises, or the control device controls the control valve so that the temperature detection means detects the flow rate. When the detected temperature exceeds a set value, the on-off valve is controlled to be opened.

According to a third aspect of the present invention, there is provided a rotating shaft, at least one centrifugal impeller attached to the rotating shaft, and a casing surrounding the centrifugal impeller. In a centrifugal compressor device including a centrifugal compressor main body, and shaft sealing means disposed at an end of a rotating shaft for preventing working gas compressed by the centrifugal compressor main body from leaking from the centrifugal compressor main body. A shaft sealing oil supply means for supplying shaft sealing oil to the shaft sealing means, a control valve for controlling the amount of oil in the shaft sealing oil, and a shaft sealing oil supply by pressurizing the shaft sealing oil supplied by the shaft sealing oil supply means. A head tank disposed in the means via a valve, and a shaft sealing oil temperature detecting means for detecting a temperature of the shaft sealing oil discharged from the shaft sealing means are provided, and the head tank is housed in the head tank. The oil level of the shaft sealing oil to be higher than the position of the shaft sealing means. It is intended.

According to a fourth aspect of the present invention, there is provided an operation of a centrifugal compressor for preventing working gas from leaking from a compressor body by using shaft sealing means of the centrifugal compressor. A first mode for controlling the flow rate of the shaft sealing oil based on the shaft sealing oil temperature when the temperature of the shaft sealing oil used for shaft sealing by the shaft sealing means is equal to or lower than a set value; And a second mode in which the shaft sealing oil is pressurized when the pressure exceeds

Preferably, in the second mode, the flow rate of the shaft sealing oil is maintained at a substantially constant value, or
In the mode, when the pressure of the working gas discharged from the centrifugal compressor main body reaches a predetermined pressure, the mode returns to the first mode.

According to a fifth aspect of the present invention, there is provided an operation of a centrifugal compressor for preventing working gas from leaking from a compressor body by using shaft sealing means of the centrifugal compressor. The method comprises a first mode for controlling based on a discharge pressure of a working gas, and a second mode for pressurizing a shaft sealing oil flowing to a shaft sealing means when the discharge pressure exceeds a set value. is there.

According to a sixth aspect of the present invention, there is provided a centrifugal machine having a rotating shaft, at least one centrifugal impeller attached to the rotating shaft, and a casing surrounding the centrifugal impeller. In a centrifugal compressor device including a compressor body and shaft sealing means disposed at an end of a rotating shaft for preventing working gas compressed by the centrifugal compressor body from leaking from the centrifugal compressor body, Shaft sealing oil supply means for supplying shaft sealing oil to the shaft sealing means, and a control valve for controlling the oil amount of the shaft sealing oil,
A head tank which pressurizes the shaft sealing oil supplied by the shaft sealing oil supply means and is disposed via a valve in the shaft sealing oil supply means, and a shaft seal which detects a temperature of the shaft sealing oil discharged from the shaft sealing means. An oil temperature detecting means, wherein a set liquid level of the shaft sealing oil contained in the head tank is higher than a position of the shaft sealing means within a range of 5 to 10 m.

In other words, a temperature controller is attached to the oil discharge line of the atmosphere side seal ring, and when the oil discharge temperature approaches the limit value, oil supply to the seal oil head tank is shut off, and control of the oil supply amount is performed. The control is switched from the constant liquid level control of the oil head tank to the constant oil discharge temperature control of the atmosphere side float ring, and the opening of the oil supply amount control valve is increased in the opening direction by a signal of the temperature controller regardless of the gas pressure. And preferably, a bumpless switching mode for preventing a sudden change of the supply hydraulic pressure used when switching the mode is provided,
Alternatively, when the temperature of the shaft sealing oil discharged from the atmosphere side seal ring increases, the supply pressure of the shaft sealing oil is controlled according to the rotation speed of the centrifugal compressor.

Further, when the gas pressure decreases, the differential pressure applied to the atmosphere-side seal ring decreases, and the amount of oil flowing through the atmosphere-side seal ring decreases.
The seal ring is approaching the burnout limit. When the oil discharge temperature approaches the limit value and exceeds a preset threshold value, the shutoff valve between the oil supply line and the seal oil head tank is fully closed, and at the same time, the control valve is opened to supply the shaft sealing oil supply pressure. To increase the amount of oil supplied to the atmosphere-side seal ring so that the oil discharge temperature becomes a constant temperature equal to or lower than the limit value.

[0020]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Some embodiments of the present invention will be described below with reference to FIGS. FIG. 1 is a longitudinal sectional view of a centrifugal compressor main body 17 according to a first embodiment of the present invention, and schematically shows a connection relation of each device of a shaft sealing system used in the centrifugal compressor main body 17. The centrifugal compressor body 17 is
It consists of a multi-stage centrifugal compressor. A multi-stage (five in FIG. 1) centrifugal impeller 21 is attached to the shaft 9, and a suction passage 22 is provided upstream of the impeller 21 in each stage.
Downstream, a vaned or vaned diffuser 23 is formed. Diffuser 23 of each stage except the last stage
A return flow path 24 is formed further downstream of the, so that the working gas can smoothly flow into the next stage. A scroll portion 25 is formed downstream of the diffuser 23 at the final stage to guide the working gas compressed by the centrifugal compressor main body 17 to a demand source. Suction channel 22, impeller 21, diffuser 23, return channel 24, and scroll portion 2
A casing 26 is provided so as to surround the periphery of the casing 5. At the end of the shaft 9, radial bearings 27a and 27b and a thrust bearing 28 are mounted for rotatably supporting the shaft 9, and these bearings are provided in a shaft sealing device 3 described later.
1 are held by bearing housings 32a and 32b.
In the multi-stage centrifugal compressor main body 17 configured as described above, when the shaft 9 connected to the driving device (not shown) is rotationally driven, the working gas sucked from the suction port 29 transfers energy by the impeller 21 of each stage. After being applied and compressed, the pressure becomes higher sequentially after passing through each stage, and is finally discharged from the discharge port 30 at a predetermined pressure (0.3 Mpa to 20 Mpa).

A part of the working gas leaks to the outside of the centrifugal compressor main body 17 through a gap formed inside the centrifugal compressor main body 17 in order to smooth the rotational movement of the impeller 21. Becomes That is, the impeller 21
The high-pressure working gas leaking from the mouth ring portion 33 and the impeller outlet portion 34 flows into labyrinth seals 35 and 36 attached to the casing 26 and the shaft 9 in order to prevent the flow of the working gas, where the pressure is reduced. Is done. However, if the pressure of the leak gas is still higher than the atmospheric pressure even after the pressure is reduced, the working gas flows into the shaft sealing device 31 provided at the end of the shaft 9.

FIG. 2 shows details of the shaft sealing device 31. The shaft 9 is covered with a stainless steel sleeve 10 in order to prevent corrosion or damage from a flammable gas such as hydrogen gas or hydrocarbon-based gas or a harmful gas such as hydrogen sulfide. The ignitable or harmful gas leaking from the downstream side may leak to the outside of the centrifugal compressor main body 17 from a gap formed between the sleeve 10 covering the rotating shaft 9 and the inner peripheral surface side of the seal ring holder 8. And In order to prevent the leakage flow, a part of the lubricating oil for lubricating the bearings 27a, 27b, 28, etc. is guided to the shaft sealing device 31 to oppose the leakage flow. The bearing lubricating oil and the shaft sealing oil may be separately supplied in consideration of the pressure level and the like.

The two seal rings, the gas side seal ring 5 held by the seal ring holder 8 and the atmosphere side seal ring 6 held by the seal ring holder 7, are provided with a gap between the two seal rings with the sleeve 10. Arrange almost in parallel.
A compression spring is provided between the two seal rings 5 and 6, and the spring presses the seal rings 5 and 6 against the respective holders 7 and 8. The seal ring holder 8 has a groove formed on the back surface of the gas-side seal ring 5, an axial slit provided at a plurality of outer peripheral portions of the gas-side seal ring 5, a gap between the two seal rings 5, 6,
A flow path is formed so that shaft sealing oil flows sequentially through the gaps between the seal rings 5 and 6 and the sleeve 10.

Next, an oil supply system to the shaft seal device 31 will be described with reference to FIG. The shaft sealing oil held in the oil reservoir tank 16 is pressurized by the oil pump 1 and guided to an oil supply pipe. The shaft sealing oil that has left the oil pump 1 is cooled by exchanging heat with cooling water in an oil cooler 2, and dust is removed by an oil filter 3, and then guided to a control valve 4. Then, the shaft sealing oil whose flow rate is controlled to the required flow rate by the shaft sealing device by the control valve 4 is guided to a shaft sealing device 31 provided near both ends of the multi-stage centrifugal compressor main body 17. It is returned to the shaft sealing oil reservoir tank 16 in which the working gas is sealed by the shaft sealing device 31. Then, this route is circulated thereafter.

A branch is provided downstream of the control valve 4, one of which is guided to the shaft sealing device 31, and the other is guided to the bottom of the seal oil head tank 13 via the shutoff valve 12. Has been. A predetermined amount of shaft sealing oil is stored in the seal oil head tank 13, and the seal oil head tank 13 is provided at a position higher than the shaft sealing device 31. The height depends on the pressure of the working gas, but is preferably set such that the liquid level in the seal oil head tank 13 is 5 to 10 m, more preferably 7 to 8 m. The head tank 13
Its height is about 2 m. That is, the shut-off valve 12
, The head of the shaft sealing oil stored in the seal oil head tank 13 acts on the shaft sealing oil flowing into the shaft sealing device 31 to prevent the working gas from leaking outside. The upper portion of the seal oil head tank 13 is connected to the shaft sealing device 31 through which the working gas to be leaked to the outside flows through the pipe 18, and the pressure of the leak flow of the working gas is equal to the internal pressure of the seal oil head tank 13. Become. That is,
There is a pressure difference between the shaft sealing oil and the leakage flow of the working gas corresponding to the head of the shaft sealing oil in the seal oil head tank 14.

Therefore, the seal oil head tank 1
3 is installed at a position vertically higher than the position of the shaft sealing device 13, so that the seal oil head tank 13
By controlling the liquid level inside the cylinder at a fixed position, the differential pressure between the shaft sealing oil of the gas side seal ring 5 and the working gas can be made constant.

In order to control the pressure and temperature of the shaft sealing oil, in the multi-stage centrifugal compressor according to the present invention, a level controller (LIC) 14 for detecting the oil level in the seal oil head tank 13 is provided. Seal oil head tank 13
It is attached to. In a return flow path from the shaft sealing device 31 to the oil reservoir tank 16, a temperature controller (TIC) 11 connects a pipe 18 connecting an upper portion of the seal oil head tank 16 to a working gas inflow portion of the shaft sealing device 31. Pressure controllers (PIC) are provided therein, and the control device 40 controls the control valve 40 and the shutoff valve 12 using these detected values.

Next, the operation of the multi-stage centrifugal compressor according to the present invention thus configured will be described with reference to the time chart of FIG.

(I) Liquid level control mode When the gas pressure P in the compressor body 17 is high, the pressure difference between the atmosphere side seal ring 6 and the atmospheric pressure increases, and the amount of oil flowing through the atmosphere side seal ring 6 Q increases. As a result, the temperature T of the drain oil returning to the oil reservoir tank 16 decreases. When the gas pressure P decreases due to a change in the process, the differential pressure also decreases, the amount of oil flowing through the atmosphere-side seal ring 6 decreases, and the temperature T of the discharged oil increases. Therefore, before the temperature of the drain oil exceeds a preset threshold value T0, a signal of a liquid level controller 14 attached to the seal oil head tank 13 is set so that the liquid level of the seal oil head tank 13 becomes constant. The control device 40 adjusts the opening degree of the control valve 4 by using this.

(II) Switching of Control Mode (Changeover) When the oil discharge temperature T detected by the temperature controller 11 exceeds the threshold value T0, the liquid level which has been used for controlling the opening degree of the control valve 4 until then. The control device 40 controls the opening degree of the control valve 4 using the signal of the temperature controller 11 that detects the temperature of the oil drained from the atmosphere-side seal ring 6 instead of ignoring the signal of the controller 14. At the same time, the shut-off valve 12 installed in the oil supply line of the seal oil head tank 13 is switched from fully open to fully closed, and the supply of the shaft sealing oil to the seal oil head tank 13 is stopped.

The switching from the liquid level control of the seal oil head tank 13 to the oil discharge temperature control can be performed using the pressure controller 15 based on the pressure of the leaked gas. In this case, there is an effect that the oil drain temperature controller 11 can be saved.

(III) Oil temperature control mode A After switching to the oil temperature control mode in step (II),
This is a transitional mode in which the oil discharge temperature T approaches the target value T3. Since the target value T3 of the drain oil temperature is lower than the threshold value T0, the control valve 4 is controlled in the opening direction by the control device 40, and the oil supply amount Q increases. As the amount of supplied oil increases, the temperature T of the oil discharged from the atmosphere-side seal ring 6 decreases, and approaches the target value T3.

(IV) Oil discharge temperature control mode B This is a mode when the oil discharge temperature T has almost reached the target value.
The control device 40 controls the opening degree of the control valve 4 so that the shut-off valve 12 remains fully closed and the oil discharge temperature T detected by the temperature controller 11 becomes the target value T3 (constant value).

(V) Control Mode Switching (Changeover) When the gas pressure P of the compressor rises to the threshold value P0 and the oil discharge temperature control mode (IV) does not need to be used, the control mode is provided in the pipe 18. Using the pressure detected by the pressure controller 15, the control system is switched again from the oil discharge temperature control to the liquid level control of the seal oil head tank 13. That is, the signal of the level controller 14 of the seal oil head tank 13 is given priority over the signal of the temperature controller 11. Then, the control device 40 sets the level controller 11
The opening of the control valve 4 is determined based on the output of
The shutoff valve 12 is switched from fully closed to fully open.

(VI) Liquid level control mode This is a control mode when the gas pressure is restored after switching to the liquid level control mode in step (V). The control device 40 controls the opening degree of the control valve 4 so that the liquid level of the seal oil head tank 13 becomes constant. At the same time, the control device 40 controls the shutoff valve 12 to be fully opened.

If the liquid level in the seal oil head tank 13 drops below the dangerous level in any of the above steps, the shut-off valve 12 is fully opened to stop the compressor. As a result, it is possible to prevent gas leakage due to a failure of the oil supply system or the like. Further, when the liquid level of the seal oil head tank 13 rises more than necessary and approaches the overflow level, the control device 40 can fully open the shutoff valve 12. In this case, it is possible to prevent the shaft seal oil from entering the pipe 18 from the seal oil head tank 13 due to an abnormality in the oil supply system or the like.

The second and third embodiments of the present invention will be described with reference to FIGS. In FIG. 5, unlike the above embodiment, the flow control valve 4 is provided in a bypass line branched from the shaft sealing oil supply line. In this case, the opening and closing operation of the flow control valve is opposite to that of the first embodiment, but the same effect as in the above embodiment can be obtained.

In the third embodiment shown in FIG. 6, the control based on the oil discharge temperature of the shaft sealing oil is omitted. That is, the control mode is switched by using the pressure controller 15 provided at a location branched from the pipe connecting the seal oil head tank 13 and the shaft sealing device 31 instead of omitting the oil discharge temperature controller. Atmosphere side seal ring 6
The oil discharge temperature of the shaft sealing oil used for sealing the shaft has a correlation with the pressure of the working gas. Therefore, the mode can be switched using the pressure value detected by the pressure controller 15. According to the present embodiment, it is not necessary to detect the oil discharge temperature, and the apparatus is simplified.

Further, the temperature of the drainage oil used for sealing the shaft of the atmosphere side seal ring 6 depends on the working gas pressure as well as the rotation speed of the centrifugal compressor. In other words, the lower the rotational speed, the higher the burnout limit temperature of the shaft seal part. improves.

In any of the above-described embodiments, if it is necessary to greatly change the opening of the control valve when switching the control mode, the opening of the valve suddenly changes at the moment of switching, and hunting of the control valve or the like may occur. There is a possibility that a problem of a sudden change in the oil amount may occur. In order to prevent these problems, if a bumpless switch that changes the degree of opening of the control valve at a predetermined speed after switching the control mode is used, the centrifugal compressor device can be operated stably.

In each of the above embodiments, the shaft sealing oil system is provided separately from the lubricating oil system. However, these systems can be integrated into one. However, since the working gas is inevitably mixed into the working gas side shaft sealing oil, the working gas side shaft sealing oil that has passed through the shaft sealing device is subjected to heating and degassing by nitrogen bubbling. . However, when dealing with a gas having a large amount of carbon (containing four or more carbon atoms), it is difficult to completely degas, and it is difficult to recirculate the shaft sealing oil on the working gas side.

In each of the above embodiments, a multi-stage centrifugal compressor is taken as an example. However, a single-stage centrifugal compressor may be used.
Further, a turbo compressor other than the centrifugal compressor may be used.

As described above, according to each embodiment of the present invention, since the oil discharge temperature of the atmosphere-side seal ring is monitored, the gap between the atmosphere-side seal ring and the sleeve can be prevented. Since it can be optimized, there is an effect that an extra gap is not required, and a device such as a pump and a tank provided in the oil supply system can be miniaturized.

Further, since the shut-off valve is provided in the oil supply line to the seal oil head tank, even if the liquid level in the head tank rises abnormally, the supply of the shaft sealing oil can be stopped. Can be prevented from entering the working gas.

The present invention relates to a multi-stage centrifugal compressor device in which the working gas is an ignitable gas or a harmful gas.
This is to prevent the working gas from leaking to the outside of the compressor device and to provide a highly reliable shaft sealing device. The present invention is not limited to the above embodiment, and the scope of the present invention is described in claims. All the modifications falling within the meaning of those descriptions are included in the present invention.

[0046]

According to the present invention, by increasing the amount of shaft sealing oil flowing between the atmosphere side seal ring and the sleeve when the temperature of the oil discharged from the shaft sealing device rises,
It is possible to provide a centrifugal compressor device provided with a shaft sealing system capable of keeping a drain oil temperature at or below a burnout limit value and capable of sealing a working gas with high reliability with a simple structure, and an operation method thereof.

[Brief description of the drawings]

FIG. 1 is a view showing one embodiment of a centrifugal compressor device according to the present invention, and is a view showing details of a shaft sealing system for supplying shaft sealing oil.

FIG. 2 is a longitudinal sectional view showing details of an oil film type shaft sealing mechanism.

FIG. 3 is a diagram showing characteristics of a seal ring.

FIG. 4 is a time chart of an embodiment of an apparatus for supplying shaft sealing oil according to the present invention.

FIG. 5 is a view showing another embodiment of the centrifugal compressor device according to the present invention, particularly showing the details of a shaft sealing system for supplying shaft sealing oil.

FIG. 6 is a view showing still another embodiment of the centrifugal compressor device according to the present invention, and is a view particularly showing details of a shaft sealing system for supplying shaft sealing oil.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Oil pump, 2 ... Oil cooler, 3 ... Oil filter, 4 ... Control valve, 5 ... Gas side seal ring, 6 ... Atmosphere side seal ring, 7 ... Seal ring holder, 8 ... Seal ring holder, 9 ... Shaft, 10 ... sleeve, 11 ...
Temperature controller, 12: shut-off valve, 13: seal oil head tank, 14: level controller, 15: pressure controller, 16: oil reservoir tank, 17: centrifugal compressor main body, 18: piping, 31: shaft sealing device, 40 ... Control device.

Claims (12)

[Claims] 1. A centrifugal compressor main body having at least one centrifugal impeller, and leakage of working gas sucked from a suction port provided in the centrifugal compressor main body and discharged from a discharge port from the centrifugal compressor main body. A centrifugal compressor device provided with a shaft sealing means for preventing the oil; supplying oil to the shaft sealing means; detecting means for detecting a temperature of oil discharged from the shaft sealing means; A centrifugal compressor device comprising: a pressurizing means for pressurizing oil to be applied; and a control means for controlling a flow rate and a pressure of the oil flowing through the oil supply means based on an output of the detecting means. 2. A rotating shaft, at least one centrifugal impeller attached to the rotating shaft, bearing means for supporting the rotating shaft and provided at both ends of the rotating shaft, and surrounding the centrifugal impeller. A centrifugal compressor body having a casing; and a shaft sealing means provided near the bearing means for preventing the working gas compressed by the centrifugal compressor body from leaking from the centrifugal compressor body. A shaft sealing oil supply unit for supplying shaft sealing oil to the shaft sealing unit; a control valve for controlling an oil amount of the shaft sealing oil; and a shaft sealing oil supplied by the shaft sealing oil supply unit. A head tank disposed in the shaft sealing oil supply means via an on-off valve to pressurize, a temperature detection means for detecting the temperature of the shaft sealing oil discharged from the shaft sealing means, and the temperature detection means Control means for controlling the control valve based on the temperature obtained. A centrifugal compressor device characterized by being provided. 3. A centrifugal compressor body having a rotating shaft, at least one centrifugal impeller attached to the rotating shaft, and a casing surrounding the centrifugal impeller, and the centrifugal compressor body compresses. A centrifugal compressor device comprising: a shaft sealing means disposed at an end of the rotary shaft for preventing working gas from leaking from the centrifugal compressor main body; and a shaft for supplying shaft sealing oil to the shaft sealing means. A sealing oil supply unit, a control valve for controlling the amount of oil in the shaft sealing oil, and a shaft sealing oil supplied by the shaft sealing oil supply unit which is pressurized and disposed in the shaft sealing oil supply unit via a valve. A head tank, and a shaft sealing oil temperature detecting means for detecting a temperature of the shaft sealing oil discharged from the shaft sealing means, wherein a set liquid level of the shaft sealing oil contained in the head tank is the shaft sealing means. Centrifugation characterized by being higher than the position within 5 to 10 m Compressor equipment. 4. The centrifuge according to claim 2, wherein the control device controls the control valve so as to increase the flow rate of the shaft sealing oil when the temperature detected by the temperature detecting means rises. Compressor equipment. 5. The centrifugal compressor device according to claim 2, wherein said control device controls to open said on-off valve when the temperature detected by said temperature detecting means exceeds a set value. . 6. A method of operating a centrifugal compressor device for preventing working gas from leaking from a compressor body by using a shaft sealing means of the centrifugal compressor device, wherein the shaft sealing means uses the shaft sealing means to seal the shaft. A first mode in which the flow rate of the shaft sealing oil is controlled based on the shaft sealing oil temperature when the temperature of the shaft sealing oil is equal to or lower than a set value, and pressurizing the shaft sealing oil when the temperature exceeds the set value. A method for operating a centrifugal compressor device, comprising: a second mode. 7. The method according to claim 6, wherein the flow rate of the shaft sealing oil is maintained at a substantially constant value in the second mode. 8. The method according to claim 6, wherein in the second mode, when the pressure of the working gas discharged from the centrifugal compressor main body reaches a predetermined pressure, the mode returns to the first mode. Operation method of the centrifugal compressor device. 9. A method of operating a centrifugal compressor device for preventing working gas from leaking from a compressor body by using a shaft sealing means of the centrifugal compressor device, the method comprising controlling based on a discharge pressure of the working gas. A method for operating a centrifugal compressor, comprising: a first mode; and a second mode for pressurizing shaft sealing oil flowing through the shaft sealing means when the discharge pressure exceeds a set value. 10. The method of operating a centrifugal compressor device according to claim 9, further comprising a bumpless switching mode for preventing a sudden change in supply hydraulic pressure used when switching said mode. 11. The supply pressure of the shaft sealing oil according to the rotation speed of the centrifugal compressor when the temperature of the shaft sealing oil discharged from the atmosphere side seal ring portion rises.
The method for operating a centrifugal compressor device according to item 1. 12. A centrifugal compressor body having a rotating shaft, at least one centrifugal impeller attached to the rotating shaft, and a casing surrounding the centrifugal impeller, and the centrifugal compressor body compresses. A centrifugal compressor device comprising: a shaft sealing means disposed at an end of the rotary shaft for preventing working gas from leaking from the centrifugal compressor main body; and a shaft for supplying shaft sealing oil to the shaft sealing means. A sealing oil supply unit, a control valve for controlling the amount of oil in the shaft sealing oil, and a shaft sealing oil supplied by the shaft sealing oil supply unit which is pressurized and disposed in the shaft sealing oil supply unit via a valve. A head tank and shaft sealing oil temperature detecting means for detecting the temperature of the shaft sealing oil discharged from the shaft sealing means are provided, and the head tank adjusts the liquid level of the shaft sealing oil stored in the head tank to It is arranged at a position that can be higher than the position of the shaft sealing means. Centrifugal compressor equipment.