JPH0120967Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention is a three-phase separator that separates a mixture of oil and water containing gas components based on the difference in their specific gravity, and is especially installed on a ship floating on the ocean to recover crude oil, etc. The present invention relates to a three-phase separator suitable for application to production stems and the like.

Conventionally, the following three-phase separators have been provided. FIG. 3 shows a conventional three-phase separator, in which an inlet 15 is provided at one end of a sealed container 11 with a large capacity, an upper outlet 12 is provided at the upper surface of the end opposite to the inlet 15, and an upper outlet 12 is provided at the middle and lower part. A middle discharge port 13 and a bottom discharge port 14 are provided respectively. The mixed liquid is injected from the inlet 15 and is separated into three phases due to the difference in specific gravity, and each outlet 1
It is discharged from 2, 13, and 14.

However, the conventional three-phase separator as described above has the following problems. In other words, when the above-mentioned three-phase separator is used as part of an offshore production system installed on a ship, etc., it oscillates under the influence of waves, currents, wind, etc., and as shown in Figure 4, gas The one-liquid interface 18 varies.
When this gas-liquid interface fluctuation exceeds a certain level,
Not only is the liquid phase stirred to prevent liquid-liquid separation, but also the liquid-liquid interface 19 changes, thereby further promoting emulsion.

As a result, in order to cope with the rocking conditions, it becomes necessary to increase the holding time in the separator or to enlarge the container.

The present invention was developed to improve the above-mentioned problems by minimizing the free zone where the liquid behaves due to external influences, and by minimizing the effect on the liquid-liquid interface by changing the gas-liquid interface. The aim is to minimize the impact.

In order to solve the above-mentioned problems, the present invention provides a three-phase separator in which discharge ports are provided at the upper, middle, and lower portions of the sealed container, and inflow ports are provided at appropriate locations. It consists of a suitable number of small domes with a small cross-sectional area provided in the upper part of the container body in communication with the container body, the upper discharge port is provided in the upper part of each dome, and the middle and lower discharge ports are provided in the container body. It is something.

An embodiment will be described below with reference to the drawings. In FIG. 1, a sealed container 1 includes a cylindrical container body 1a, and two cylindrical tubes provided at both ends thereof substantially perpendicularly to the container body 1a. 1st dome 1
b and a second dome 1c, each dome 1
b, 1c are connected to the upper surface of the container body 1a through connection pipes 6, 6 and connected to the container body 1a. 1st
The dome 1b has a larger diameter and is longer than the second dome 1c, and is provided with an inlet 5 in the middle. Upper discharge ports 2, 2 are provided at the upper part of each dome 1b, 1c, and these upper discharge ports 2, 2 are connected above the three-phase separator and communicated to the outside. On the second dome 1c side, a middle outlet 3 is provided at the upper part of the wall of the container body 1a, and a lower outlet 4 is provided at the lower part. The inlet 5 is provided with a valve 5a for controlling the inflow liquid and preventing backflow of gas, and each outlet 2, 3,
4 is provided with valves 2a, 3a, and 4a for controlling the discharge of each separated phase. Also the second
The dome 1c is provided with a detector (not shown) for detecting the liquid level, and controls the liquid level together with the above-mentioned valves.

Next, the method of use and operation of the embodiment will be described. There are two types of three-phase separators: batch type and continuous type. It is something to do,
In the latter case, it is necessary that the scale of the device be larger than a certain level and that the liquid level be controlled. Next, we will discuss the effect when used in a continuous type.
The liquid level of the gas, oil, and water mixture flowing in from the inlet port 5 is detected by a liquid level detector installed in the second dome 1c, and the inflow amount and discharge amount are controlled to be approximately equal. The liquid level is controlled to be maintained within the domes 1b and 1c. The residence time of the liquid in the container body 1a is controlled by its inflow and discharge amounts, and is determined by the separation characteristics of the mixed liquid and the required efficiency. The gas components are separated in the domes 1b and 1c and discharged from the upper outlet 2, and in the container body 1a, while the mixed liquid flows from the inlet 5 side to the middle and lower outlets 3 and 4, the oil and water have a specific gravity. Separated by difference.

The above three-phase separator is installed on board a ship, etc.
When the container body 1a swings, both the gas-liquid interface 8 and the liquid-liquid interface 9 change as shown in FIG. Dome 1b, 1 that performs one-liquid separation
c is provided separately, and by controlling the container body 1a to be full of liquid and without an air layer, fluctuations in the liquid-liquid interface 9 can be suppressed to a small level.

In the above embodiment, the connecting position of the connecting pipe 6 to the container body 1a does not necessarily have to be on the top surface, but it needs to be above the liquid-liquid interface 9. Further, the domes 1b and 1c may be provided directly on the container body 1a without using the connecting pipe 6, and the number of domes is 1.
Or it may be multiple appropriate numbers.

As explained above, the present invention provides a three-phase separator in which discharge ports 2, 3, and 4 are provided at the upper, middle, and lower portions of the sealed container 1, respectively, and an inlet port 5 is provided at an appropriate location. consists of a container body 1a and an appropriate number of small domes 1b and 1c with small cross-sectional areas provided on the upper part of the container body 1a in communication with the container body 1a, and the upper discharge port 2
are provided in the upper part of each dome 1b, 1c, and the middle and lower discharge ports 3, 4 are provided in the container body 1a, so that gas-liquid separation is possible using the domes 1b, 1c where the free zone where the liquid level fluctuates is small. By keeping the container body 1a in which the liquid-liquid separation is performed in a full liquid state, even if the three-phase separator swings, turbulence at the liquid-liquid interface is suppressed and separation is performed smoothly. Therefore, the retention time of the liquid in the container is shortened, and the size of the container can also be reduced. In addition, stable operations are performed with little splash.

[Brief explanation of the drawing]

1 and 2 are cross-sectional views schematically showing an embodiment of the present invention, and FIGS. 3 and 4 are cross-sectional views schematically showing a conventional example. 1... Airtight container, 1a... Container body, 1b...
1st dome, 1c...Second dome, 2...Upper outlet, 3...Middle outlet, 4...Lower outlet, 5
...Inflow port.

Claims (1)

[Scope of utility model registration request] Discharge ports 2, 3, and 4 are provided at the top, middle, and bottom of the airtight container 1, respectively, and an inflow port 5 is provided at an appropriate location.
In the three-phase separator, the hermetic container 1 includes a container main body 1a;
It consists of a suitable number of small domes 1b and 1c with small cross-sectional areas, which are connected to the container body 1a and are provided in the upper part of the container body 1a.
The upper discharge port 2 is located at the top of each dome 1b, 1c, and the middle and lower discharge ports 3, 4 are located at the container body 1.
A three-phase separator characterized in that it is provided in a.