JPH0644799U - Oil tank - Google Patents

Abstract

(57) [Abstract] [Purpose] In an oil tank that stores oil accompanied by flammable gas, such as a compressor, prevents gas from flowing into the gas phase part of the oil tank and enhances explosion-proof properties. A vertical pipe in which a horizontal pipe 4a and a horizontal pipe 4a connected to an oil return line 2 are opened at an intermediate portion, an upper end is connected to a gas discharge line 5 and a lower end is opened in oil L in an oil tank 1. Oil tank 1 equipped with gas-liquid separator 4 consisting of pipe 4b
Therefore, the gas is separated from the oil in the gas-liquid separator 4 and directly discharged from the vertical pipe 4b to the gas discharge line 5.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an oil tank for storing and returning oil containing gas such as an oil tank for a compressor (gas compressor) in a petrochemical plant.

[0002]

[Prior art]

 3 and 4 show a conventional oil tank for a compressor. As shown in FIG. 3, a horizontal pipe 02 connected to the oil return line is provided in the upper part of the oil tank 01, and a vertical pipe 03 having an upper end connected to the end of the horizontal pipe 02 is provided in the oil tank 01. ing. Further, an opening 04 is provided on the upper surface of the connecting portion between the horizontal pipe 02 and the vertical pipe 03. Reference numeral 05 is a gas outlet provided at the upper end of the oil tank 1 and connected to a gas discharge line.

In this oil tank, oil (lubricating oil and seal oil) from a compressor (not shown) enters the horizontal pipe 02 from the oil return line, and the combustible gas contained in the gas phase portion of the oil return line is The gas flows from the opening 04 into the upper part of the oil tank 01 and is discharged from the gas outlet 05 to the gas discharge line. On the other hand, the oil L from which the combustible gas has been separated flows down through the vertical pipe 03 and is stored in the oil tank 01.

As shown in FIG. 4, an oil tray 07 that is inclined downward is provided at an oil inlet 06 of an oil tank 01 connected to an oil return line, and an oil tray 07 is provided from the oil return line through the oil inlet 06. The oil that has entered the tank 01 separates the combustible gas on the tray 07, the combustible gas is discharged from the gas outlet 05 to the gas discharge line, and the oil L is stored in the oil tank 01.

[0005]

[Problems to be solved by the device]

 In an oil tank into which oil accompanied by a flammable gas such as compressor lubricating oil and seal oil flows, the flammable gas is discharged by an oil tank as shown in FIGS. 3 and 4, and when necessary. Although the inert gas is supplied to this oil tank to exhaust and discharge the combustible gas, the combustible gas cannot be completely purged to the stagnation part in the upper part of the oil tank.

The present invention is intended to provide an oil tank capable of sufficiently separating gas such as flammable gas from oil and storing only oil.

[0007]

[Means for Solving the Problems]

 The oil tank of the present invention has a horizontal pipe connected to the oil return line and an upper end connected to the gas discharge line, a lower end opened into the oil in the oil tank, and the horizontal pipe opened in an intermediate portion. It is characterized in that it is equipped with a gas-liquid separator consisting of a vertical pipe.

[0008]

[Action]

 In the present invention, the gas-containing oil enters the oil tank from the oil return line through the horizontal pipe of the gas-liquid separator. At the opening of the horizontal pipe to the vertical pipe, oil flows down in the vertical pipe of the gas-liquid separator, while gas flows upward in the vertical pipe to separate gas and liquid. In this way, the oil from which the gas has been separated is stored in the oil tank, and the gas is discharged directly from the vertical pipe to the gas discharge line.

As described above, according to the present invention, oil and gas are separated in the gas-liquid separator, and the separated gas is discharged directly from the vertical pipe of the gas-liquid separator to the gas discharge line. Is prevented from flowing into the gas phase in the oil tank.

[0010]

【Example】

 An embodiment of the present invention will be described with reference to FIGS. Reference numeral 1 is an oil tank for lubricating oil and seal oil circulating in the compressor 10. As shown by the arrow in FIG. 1, the lubricating oil and seal oil are supplied to the compressor 10 via lines 8 and 9 by the compressors 6 and 7, respectively. The lubricating oil and seal oil supplied to the oil tank and returned from the compressor are returned to the oil tank 1 via the oil return line 2. Further, 11 in FIG. 1 is a seal oil trap.

A horizontal pipe 4 a penetrating a side portion of the oil tank 1 is provided in the upper portion of the oil tank 1, and the horizontal pipe 4 a is connected to the oil return line 2. Further, a vertical pipe 4b is provided in the oil tank 1, the upper portion thereof penetrates the top of the oil tank 1 and extends upward, the upper end thereof is connected to the gas discharge line 5, and the lower end thereof is It opens into the oil L in the oil tank 1. The horizontal pipe 4a is opened at an intermediate portion of the vertical pipe 4b, and the horizontal pipe 4a and the vertical pipe 4b constitute a gas-liquid separator 4. An oil flow buffer plate 4c is provided at the opening at the lower end of the vertical pipe 4.

In the present embodiment, the return oil of the lubricating oil and the seal oil accompanied by the combustible gas from the compressor 10 passes from the oil return line 2 through the horizontal pipe 4a, as shown by the arrow a in FIG. It is introduced into the gas-liquid separator 4. Oil and combustible gas are separated at the opening of the horizontal pipe 4a to the vertical pipe 4b, and the oil flows down in the vertical pipe 4b and is stored in the oil tank 1 as shown by an arrow c in FIG. On the other hand, the combustible gas rises in the vertical pipe 4 and is discharged to the gas discharge line 5 as shown by an arrow b in FIG.

As described above, the oil and the combustible gas are separated in the gas-liquid separator 4, and the separated combustible gas is directly discharged to the gas discharge line 5 from the vertical pipe 4b. Combustible gas does not flow into the gas phase part of the. Therefore, the safety of the oil tank 1 against explosion can be improved.

[0014]

[Effect of device]

 In the present invention, the gas is separated from the oil in the gas-liquid separator consisting of the horizontal pipe and the vertical pipe, and the gas is discharged directly from the vertical pipe of the gas-liquid separator to the gas discharge line. It does not flow into the gas phase in the oil tank. Therefore, the present invention can improve the safety against oil tank explosion.

[Brief description of drawings]

FIG. 1 is a system diagram of an oil tank and an oil apparatus using the same according to an embodiment of the present invention.

FIG. 2 is a vertical cross-sectional view of the gas-liquid separator of the oil tank of the same embodiment.

FIG. 3 is a vertical cross-sectional view showing an oil return portion of an example of a conventional oil tank.

FIG. 4 is a vertical sectional view showing an oil return portion of another example of the conventional oil tank.

[Explanation of symbols]

 1 oil tank 2 oil return line 3 gas discharge line 4 gas-liquid separator 4a horizontal pipe 4b vertical pipe 6,7 pump 10 compressor L oil

Claims (1)

[Scope of utility model registration request] 1. A horizontal pipe connected to an oil return line, and a vertical pipe whose upper end is connected to a gas discharge line and whose lower end opens into oil in an oil tank, and whose horizontal pipe opens to an intermediate portion. An oil tank, which is equipped with a gas-liquid separator.