JPS6213493B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to cold power generation equipment, and more particularly to cold power generation equipment having a Rankine cycle (hereinafter abbreviated as cold power generation).

A conventional cold eruption example will be explained with reference to FIG.

In FIG. 1, a condenser 10, a Rankine medium pump (hereinafter abbreviated as a medium pump) 11, a medium pump 11
and evaporator 12, evaporator 12 and expansion turbine (hereinafter abbreviated as turbine) 13, and turbine 13 and condenser 10, each connected to a conduit 30 so as to form a closed circuit.
~ 33, and the turbine 13 is connected to the generator 1
4 are connected. The condenser 10 includes heat transfer tubes 2
A conduit 34 connected to a low temperature liquefied gas liquid feeding pump (hereinafter abbreviated as liquid feeding pump) 15 is connected to one end thereof. Liquid pump 15
and low-temperature liquefied gas storage tank (hereinafter abbreviated as tank)
16 through a conduit 35. Heat exchanger tube 2
The other end of Oa is connected to the warmer 17 via a conduit 36. The warmer 17 is connected to a conduit 37 that is connected to a separate user (not shown). A heat transfer tube 20b is installed inside the warmer 17, and a conduit 38 and a conduit 39 are connected to one end and the other end, respectively. The evaporator 12 includes a heat transfer tube 20
A conduit 39 is connected to one end thereof, and a conduit 40 open to a heat medium discharge path (hereinafter referred to as a discharge path) 50a is connected to the other end. Note that Freon, propane, etc. are used as the Rankine medium (hereinafter abbreviated as medium).

The vaporized medium (hereinafter abbreviated as vaporized medium) is supplied from the tank 16 to the heat transfer tube 20a via the liquid feed pump 15 and the conduits 35 and 34 in the condenser 10,
The low temperature liquefied gas flowing through the heat exchanger tube 20a, for example,
It is condensed and liquefied using the cold energy of LNG. The liquefied medium (hereinafter abbreviated as liquefied medium) is transferred to the condenser 1
0 via a medium pump 11 and via conduits 30, 31 to an evaporator 12. A part of this liquefied medium is supplied to the heat exchanger tube 20c in the evaporator 12 through the conduit 38, the heat exchanger tube 20b, and the conduit 39.
After flowing through c, it is heated and vaporized by a heating source, for example, seawater, which is discharged from the conduit 40 to the discharge path 50a. This vaporized medium is transferred from the evaporator 12 to the conduit 3
The gas is supplied to the turbine 13 via 2, and expands there to drive the turbine 13 and the generator 14.
The vaporized medium expanded in the turbine 13 is transferred to the turbine 1
3 through a conduit 33 to the condenser 10, where it is again condensed and liquefied. On the other hand, LNG vaporized by condensing and liquefying the vaporization medium while flowing through the heat exchanger tube 20a is supplied to the warmer 17 via the conduit 36, and here, is supplied to the heat exchanger tube 20b from the conduit 38, After flowing through the heat exchanger tubes 20b, the seawater is heated by the seawater supplied from the conduit 39 to the heat exchanger tubes 20c, and then the seawater is transferred from the warmer 17 to the conduit 37.
After that, it is separately sent to the user.

In such cold blowouts, oil, e.g. the lubricating oil used in the turbine, mixes with the vaporized medium when it expands in the turbine, thus reducing the lubricating oil concentration of the liquefied medium in the evaporator. As a result, a severe foaming phenomenon occurs in the evaporator, and as a result, a vaporized medium containing a large amount of mist is supplied to the turbine, which damages the turbine and makes it impossible to operate, resulting in continuous cold generation. The problem was that I was no longer able to drive.

The object of the present invention is to provide a refrigerated generator that can be operated continuously by eliminating the above-mentioned drawbacks.

A feature of the present invention is that an oil separator is provided to separate oil mixed in the liquefied medium from the liquefied medium that is being fed from the condenser to the evaporator or partially extracted from the condenser. By connecting the oil separator and condenser with a conduit that returns the vaporized medium from which oil has been separated in the oil separator to the condenser, the oil concentration of the liquefied medium in the evaporator is reduced and severe foaming phenomenon is suppressed. It's what I chose to do.

An embodiment of the present invention will be explained with reference to FIG. Note that in FIG. 2, the same devices as in FIG.

In FIG. 2, the oil separator 18 has a conduit 41 branched from the conduit 30 and provided with a valve 50 and a check valve 51.
are connected. A conduit 42 is connected to the top of the oil separator 18 and conduit 42 is connected to the top of the condenser 10 . A conduit 43 connected to the drain oil tank 19 and provided with a valve 52 is connected to the bottom of the oil separator 18 . The oil separator 18 is provided with a heat transfer tube 20d, at one end of which is a conduit 44 branched from the conduit 38 and provided with a valve 53, and at the other end is a conduit 45 open to a discharge path 50b. connected.

The vaporized medium supplied from the evaporator 12 via the conduit 32 to the turbine 13 is expanded here, with the
The lubricating oil used in the turbine 13 is mixed into the vaporizing medium. The vaporized medium mixed with lubricating oil is circulated and supplied from the turbine 13 to the condenser 10 via the conduit 33, and then supplied from the tank 16 via the liquid feed pump 15 to the conduits 35 and 34 to the heat exchanger tube 20a. is condensed and liquefied using the cold heat of circulating LNG. The liquefied medium mixed with the lubricating oil is supplied from the condenser 10 to the evaporator 12 via the medium pump 11 and the conduits 30 and 31. However, if this state continues, the evaporator 12
The lubricating oil concentration of the liquefied medium at step 2 increases, and a severe foaming phenomenon begins to occur. Therefore, by adjusting a portion of the liquefied medium mixed with lubricating oil flowing through the conduit 30 toward the medium pump 11, for example, by adjusting the opening degree of the valve 50, the lubricating oil concentration of the liquefied medium in the evaporator 12 can be increased. An amount (hereinafter abbreviated as a predetermined amount) whose concentration is below that which can suppress the foaming phenomenon is extracted and supplied to the oil separator 18 via a conduit 41 via a valve 50 and a check valve 51. The liquefied medium mixed with lubricating oil is now passed through valve 5.
3 is opened, it is supplied to the heat exchanger tube 20d via the conduits 38 and 44, and after flowing through the heat exchanger tube 20d,
It is heated by the seawater discharged from the conduit 45.
Due to this heating, the liquefied medium is evaporated and separated from the lubricating oil. The vaporized medium flows from the oil separator 18 to the conduit 4.
2 and returned to the condenser 10, where it is again condensed and liquefied. On the other hand, after the lubricating oil is gradually concentrated in the oil separator 18, by periodically opening the valve 52, the lubricating oil is passed from the oil separator 18 to the conduit 43 via the valve 52.
The oil is then extracted to the waste oil tank 19 and processed.

In cold generation as in this embodiment, a predetermined amount of the liquefied medium mixed with lubricating oil that is being fed from the condenser to the evaporator is extracted and supplied to the oil separator, where the medium and lubricating oil are separated. Because they are separated, the lubricating oil concentration of the liquefied medium in the evaporator does not increase, suppressing the severe foaming phenomenon in the evaporator, and therefore allowing the vaporized medium to reach the turbine without entraining a large amount of mist. This prevents damage to the turbine and enables continuous cold generation operation.

In this example, the liquefied medium mixed with lubricating oil is extracted on the way from the condenser to the evaporator and supplied to the oil separator. The oil may be directly extracted from the condenser and supplied to the oil separator.

As explained above, the present invention provides an oil separator that separates oil mixed in the liquefied medium while it is being fed from the condenser to the evaporator or partially extracted from the condenser. In addition, by connecting the oil separator and condenser with a conduit that returns the vaporized medium from which oil has been separated in the oil separator to the condenser, it is possible to suppress the severe foaming phenomenon in the evaporator and entrain a large amount of mist. Since the vaporized medium can be supplied to the turbine without any damage to the turbine, damage to the turbine can be prevented and cold generation can be operated continuously.

[Brief explanation of the drawing]

FIG. 1 is a system diagram of a conventional cold power plant having a Rankine cycle, and FIG. 2 is a system diagram showing an embodiment of a cold power plant having a Rankine cycle according to the present invention. 10... Condenser, 12... Evaporator, 13... Turbine, 14... Generator, 18... Oil separator.

Claims (1)

[Claims] 1 In a cold-thermal power generation facility having a Rankine cycle and consisting of a condenser, an evaporator, an expansion turbine, and a power generator, the condenser is condensed and liquefied in the condenser and is sent to the evaporator or is removed from the condenser. An oil separator is installed to separate the oil mixed in the medium from the extracted Rankine medium, and a conduit is installed to separate the oil in the separator and return the vaporized Rankine medium to the condenser. A cold power generation facility characterized by being connected to a container and a condenser.