JPS6153532B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a power generation plant having a prime mover driven by low-boiling medium vapor, forming a closed cycle in which the low-boiling medium used as an energy medium can be used repeatedly without dissipating. At the same time, a closed cycle is formed in which the lubricating oil flowing through the lubricated part can be used repeatedly, and the low-boiling point medium mixed in the lubricating oil is separated from the lubricating oil and refluxed into the low-boiling point medium. An operating method capable of stabilizing the above-mentioned separation action in a good state by adding appropriate control to the operation, as well as power plant equipment that can be directly used to implement the above-mentioned operating method to obtain good results, are provided. This contributes to safe and low-cost operation of power generation plants using media.

Conventionally, a power generation plant using a low boiling point medium generally consists of the following two circulation systems as shown in FIG.

A low-boiling point medium circulation circuit 4 (indicated by a one-dot chain line) exits from the low-boiling point medium steam generator 1, passes through the turbine 2 and the condenser 3, and returns to the low-boiling point medium steam generator; and a lubricating oil exits from the lubricating oil tank 5; pump 6,
The lubricating oil tank 5 passes through the lubricating oil heater 7, the orifice 8, the lubricating oil cooler 9, and the lubricated part 10.
When the low boiling point medium steam passes through the turbine 2 to drive the turbine 2, it is extremely difficult to completely seal the high speed rotating parts, so generally the turbine A small amount of low boiling point medium is allowed to leak from the generator 2, and instead, the outer shell of the generator including the turbine 2, the generator 12, and the transmission equipment 13 is made into an airtight seal 14.

The main stream of the low boiling point medium that has passed through the turbine 2 flows through the pipe 4a to the condenser 3, and then flows through the turbine 2.
The low boiling point medium leaking out is prevented from diffusing by the airtight seal 14 and is led to the condenser 3 via the conduit 4b.

Conventionally, as mentioned above, some low boiling point medium leaks out in the turbine 2, and the vapor of the low boiling point medium fills the airtight seal 14. Therefore, it is difficult to avoid that the lubricating oil circulating in the lubricated part 10 within this airtight seal comes into contact with the vapor of the low-boiling point medium and that the low-boiling point medium is dissolved and mixed into the lubricating oil.

When a low boiling point medium enters the lubricating oil, its oil film retention performance (oiliness) is significantly reduced.

FIG. 2 is a chart showing changes in oil film thickness with respect to changes in mixing ratio when hindered ester oil is used as the lubricating oil and Freon R113 is used as the low boiling point medium, and shows actual measured values. From this chart, it can be understood that when a low boiling point medium is mixed into lubricating oil, the oil film thickness decreases dramatically as the mixing rate increases. A similar tendency occurs when a low boiling point medium other than Freon R113 is mixed into a lubricating oil other than hindered ester oil.

The prior art device shown in FIG. 1 is constructed as follows in order to recover the oiliness of the lubricating oil caused by the contamination of the low-boiling point medium and to recover and reuse the expensive low-boiling point medium. ing. That is,
The lubricating oil containing a low boiling point medium in the lubricating oil tank 5 is
The lubricating oil is pumped by the lubricating oil pump 6 , heated as it passes through the lubricating oil heater 7 , flows through the orifice 8 , and flows into the lubricating oil cooler 9 . As you know,
Generally, the solubility of low-boiling solutes in liquid solvents decreases as the temperature increases and as the pressure decreases, so the lubricating oil heated as described above and then passed through the orifice is It changes as follows.

When heated by the heater 7, the solubility decreases,
A part of the low boiling point medium, which is a solute, is separated and vaporized from the lubricating oil, which is a solvent, and the remainder is also in a state where it is easy to separate (saturated or supersaturated).

Then, when it passes through the orifice 8, it undergoes a rapid pressure drop. Since the pressure drop decreases the solubility, the low boiling point medium, which is the solute, separates and vaporizes from the lubricating oil, which is the solvent.

The separated and vaporized low-boiling point medium is led to the condenser 3 via the pipe 4c, where it joins the low-boiling point medium circulation circuit 4.

As a reference for the above action, Figure 3 shows the solubility curve of Freon R113 in hindered ester oil. The curve is pressure (gauge pressure, same below) 1
Solubility at Kg/ ^cm2 , curve at pressure 0.5Kg/ ^cm2
The curve shows the solubility at 0.2Kg/ ^cm2 .

The prior art described above has the following drawbacks.

Since the lubricating oil heater 7 does not have an oil temperature adjustment device,
The temperature near the outlet of the lubricating oil heater 7 changes due to changes in the amount of heat of the heating source, changes in the amount of heat generated by the lubricated part 10, etc., and the separation of the low boiling point medium becomes unstable.

Since the lubricating oil cooler 9 does not have a pressure control device,
The internal pressure fluctuates under the influence of the condenser 3 via the conduit 4C. As a result, the cooler 9
The solubility of the low boiling point medium in the lubricating oil changes, making the separation effect unstable.

The low boiling point medium that has passed through the orifice 8 and has been vaporized due to the change in solubility as described above is in the separation chamber 15.
However, since this separation chamber 15 is provided inside the outer case of the condenser 9, the vaporized low boiling point medium is cooled, and a part of it is liquefied and relubricated. It gets mixed into the oil and impairs the purity of separation.

The lubricating oil in the cooler 9 from which the low boiling point medium has been separated is sent to the lubricated part 10 by the pump 16, but if for some reason this pump 16
As soon as the lubricating oil stops functioning, the lubricating oil circulation stops and the lubricated part 10 seizes and is seriously damaged.

The present invention was made in view of the above circumstances, and
By preheating the lubricating oil that has passed through the lubricated parts and contaminating the lubricating oil, and then degassing it under reduced pressure, the low-boiling medium dissolved in the lubricating oil is separated and vaporized. The separated lubricating oil is appropriately cooled and re-supplied to the lubricated parts for circulation, and the separated and vaporized low-boiling point medium is collected and refluxed into the low-boiling point medium circulation, and By adding automatic control or manual control as described later to this operation, it is an object of the present invention to solve the various drawbacks of the prior art described above.

Next, one embodiment of the present invention will be described with reference to FIG. The low boiling point medium in the condenser 3 is supplied to the low boiling point steam generator 1 via the on-off valve 18 by the pump 17.
The low boiling point medium vapor generated here is sent to the main steam stop valve 19a and the main steam control valve 1.
The low boiling point medium vapor supplied to the turbine 2 via 9b and having driven the turbine is led to the condenser 3 via the pipe 4a and refluxed. The above circulation flow forms a circulation system for the low boiling point medium. Note that the low-boiling point medium vapor leaking from the turbine 2 is collected by the airtight outer seal 14, guided to the condenser 3 through the conduit 4b, and joined to the above-mentioned low-boiling point medium circulation system.

The lubricating oil tank 5 stores the lubricating oil that has passed through the bearings 10', 10', which are the lubricated parts of the turbine 2 and the generator 12, and this lubricating oil contains a low boiling point medium dissolved therein. It's in. This lubricating oil is sent to a vacuum deaerator 21 by a pump 6 via a lubricating oil heater 7 and a flow control valve 20, and is sent to a spray hole 22.
It is sprayed into the container. Since the pressure inside the vacuum deaerator 21 is reduced by the configuration described later, the low boiling point medium in the lubricating oil is vaporized and separated, and the pure lubricating oil is collected in the oil sump 23 inside the vessel. The lubricating oil in the oil reservoir 23 is pumped by a pump 24, cooled by a lubricating oil cooler 25, flows through the bearings 10', 10', and returns to the lubricating oil tank 5. The circulation from the lubricating oil tank 5 and returning to the lubricating oil tank 5 as described above is the lubricating oil circulation system during normal operation.

The lubricating oil heater 7 uses high-temperature steam of the low-boiling point medium generated by the low-boiling point medium steam generator 1 as a heat source. That is, a part of the low-boiling point medium vapor generated in the low-boiling point medium vapor generating device 1 is sent to the lubricating oil heater via a pipe line 26 branched from the above-mentioned low-boiling point medium circulation system pipe line 4 and a flow rate control valve 27. 7, where it exchanges heat with the lubricating oil, flows into the condenser 3, and joins the low boiling point medium circulation system. The flow rate control valve 27 is linked with a lubricating oil temperature detector 28 installed near the lubricating oil outlet of the lubricating oil heater 7, and has a low boiling point so that the outlet temperature of the lubricating oil is maintained at a preset temperature. It has a structure that adjusts the flow rate of the medium.

The vacuum deaerator 21 uses the high-temperature, high-pressure low-boiling point medium vapor generated by the low-boiling point medium vapor generating device 1 as a driving source. That is, a part of the low boiling point medium vapor generated in the low boiling point medium vapor generating device is transferred to the pipe line 3 which is branched from the pipe line 4 of the low boiling point medium circulation system described above.
The gas is supplied to the ejector 29 for discharging the gas in the decompression deaerator 21 through the flow control valve 31 and the ejector 29 to drive the ejector. It is guided to the low boiling point medium condenser 3 which has finished driving and joins the low boiling point medium circulation system. The flow rate control valve 31 is linked to a pressure detector 32 that detects the internal pressure of the deaerator 21, and controls the flow rate of the low boiling point medium vapor that is the driving source so as to keep the internal pressure constant. do.

The decompression deaerator 21 is provided with an oil level detector 33 for detecting the oil level in the internal oil reservoir 23, and this oil level detector 33 is adapted to be linked with the aforementioned flow rate control valve 20. There is. The flow rate of lubricating oil fed into the vacuum deaerator 21 is controlled so as to keep the oil level in the oil reservoir 23 in the vacuum deaerator 21 constant.

The decompression deaerator 21 is disposed at the highest position among the various devices constituting the lubricating oil circulation system, and is set to have an appropriate head with respect to the bearings 10', 10', which are lubricated parts. ing. A pump 24 is provided between the bottom of the oil sump 23 and the bearings 10', 10'.
An emergency lubrication pipe line 35 with a valve 34 interposed therein is provided as a bypass line for short-circuiting. The valve 34 is linked to the lubricating oil pump 24, and is opened if the lubricating oil pump 24 stops functioning during operation.

As described above, the main steam stop valve 19a is connected in series with the main steam control valve 19b in a high-temperature, high-pressure pipeline for a low boiling point medium, and is linked to the specific gravity detector 36. Above specific gravity detector 3
6 detects the specific gravity of the lubricating oil near the outlet of the lubricating oil cooler 25, and when the specific gravity falls below a preset value, closes the valve 19a to prevent the flow of low boiling point medium vapor. It's getting old.

A manual on-off valve 37 is provided at a point A near the inlet of the on-off valve 18 connected to the pipe line between the pump 17 and the low boiling point medium steam generator 1, and a manual on-off valve 38 is provided at a point B near the outlet. Each is connected with piping. Note that both manual on-off valves 37 and 38 are normally closed, and the above-mentioned on-off valve 18 is in communication during normal times. These valves are arranged as necessary to divert the low-boiling point medium pumped by the pump 17 from point A, circulate it through the coolant flow path of the lubricating oil cooler 25, and then return it to point B to circulate the low-boiling point medium. This is provided as a preparation for merging into the system. Note that the manual on-off valve 37 and the lubricating oil cooler 2
A pipe (not shown) connects and communicates between the manual on-off valve 38 and the coolant outlet 40 of the lubricating oil cooler 25 (not shown). ) should be prepared separately as necessary.

When a power generation plant is operated by the apparatus according to the embodiment shown in FIG. After being heated by the vacuum deaerator 21, the low boiling point medium is separated and vaporized in the vacuum deaerator 21.

In this case, the low boiling point medium dissolved in the lubricating oil is separated and vaporized mainly in the vacuum deaerator 2.
This is because the pressure inside the container 1 is reduced, so the solubility of the low boiling point medium, which is the solute in the lubricating oil, which is the solvent, decreases as the pressure decreases, and the supersaturated low boiling point medium vaporizes. By preheating the upper lubricating oil by the lubricating oil heater 7, the above-mentioned vaporization is further facilitated. Therefore, in order to completely and stably separate the low-boiling point medium by the vacuum deaerator 21, it is necessary to maintain the internal pressure of the vacuum deaerator 21 at an appropriate constant pressure, and to It is necessary to maintain the temperature of the lubricating oil at an appropriate constant temperature. In the present invention, the lubricating oil into which a low-boiling point medium has been dissolved in the lubricating oil tank 5 is preheated and then sent to the vacuum deaerator, while controlling the lubricating oil temperature and the internal pressure of the vacuum deaerator. Therefore, the separation effect of the low boiling point medium by the aforementioned vacuum degassing is stabilized,
Moreover, it is possible to completely proceed with the separation. When the low boiling point medium is completely separated, the lubricating oil regains its high purity and good oiliness, making it suitable for reuse.

Further, the low boiling point medium separated by degassing under reduced pressure is sent to the condenser 3 via the mist separator 41 and the ejector 29, and is made to join the low boiling point medium circulation system. In this way, the low boiling point medium dissolved in the lubricating oil is separated and recovered without being dissipated outside the power plant system, so that the low boiling point medium, which is an expensive consumable material, does not lose weight.

In addition, the lubricating oil flowing through the lubricated part 10' absorbs the frictional heat generated by the lubricated part 10', and is further heated by the lubricating oil heater 7, so that the temperature of the lubricating oil accumulated in the oil sump 23 after being depressurized and degassed is reduced. It's getting pretty hot. Therefore, in the configuration of the present invention, the lubricating oil in the oil reservoir 23 is cooled to an appropriate temperature by the lubricating oil cooler 25 and then supplied to the lubricated portion 10'. Thereby, the lubricating oil can effectively absorb the frictional heat generated by the lubricated portion 10' and carry it away.

As described above, in the method of operating a power plant according to the present invention, a closed cycle of preheating lubricating oil, vacuum degassing, cooling, and circulation of lubricated parts is repeated, and a low boiling point medium is separated by vacuum degassing. The low boiling point medium is recovered into the low boiling point medium circulation system, and the low boiling point medium separation effect by the vacuum degassing is stabilized by controlling the preheating temperature and the vacuum pressure of the vacuum degassing, and as a result, the low boiling point medium Moreover, the lubricating oil can be used repeatedly, thereby reducing the operating cost of the power plant.

According to the power plant of FIG. 4 according to the present invention,
Preheating, vacuum degassing, cooling, and
The circulation cycle of the lubricated parts can be carried out continuously, the separated low-boiling point medium can be regularly recovered, and the lubricating oil temperature and pressure inside the vacuum deaerator can be controlled in the above-mentioned operation method. can be easily done.

In addition, in this embodiment, since the steam of the low boiling point medium is used as the heat source of the lubricating oil heater 7, there is no need to obtain another heat source from outside the system of this device, and the entire device can be made compact. is possible,
Since the lubricating oil temperature is kept constant using the flow control valve 27 and the temperature detector 28, the lubricating oil temperature can be automatically controlled.

In addition, in this embodiment, since the steam of the low boiling point medium is used as the drive source for the ejector 29 of the vacuum deaerator 21, there is no need to obtain another power source from outside the system of the device, and the entire device can be operated. Can be made compact. By interlocking the flow rate adjustment valve 31 with the pressure detector 32, the flow rate of the low boiling point medium vapor that drives the ejector 29 is controlled to keep the internal pressure of the decompression deaerator 21 constant. , the vacuum degassing pressure can be automatically controlled.

Furthermore, in this embodiment, the flow rate of lubricating oil flowing into the decompression deaerator 21 is determined by the oil amount adjusting valve 20 and the oil level detector 3.
3 to keep the oil level in the oil reservoir 23 in the vacuum deaerator constant, so even if the lubricating oil pump 6 stops functioning, the oil reservoir 23 remains constant. It is possible to continue lubrication for a while with the lubricating oil inside, and the amount of oil stored in the oil reservoir that can be used for this purpose is always guaranteed to be a constant amount.

Furthermore, in this embodiment, since the vacuum deaerator 21 is disposed at the highest point in the lubrication system, its oil reservoir 23 also serves as a head tank for the pump 24.
This ensures an effective suction head of the pump and prevents cavitation. Further, since the oil reservoir 23 is located at a high location, even if the lubricating oil pump 24 should fail, the lubricating oil can continue to be supplied to the bearing 10' by the flow of the lubricating oil under its own weight.

In addition, in this embodiment, the main steam stop valve 19a is linked to the lubricating oil specific gravity measuring device 36, and when the lubricating oil specific gravity falls below a preset value, the supply of low boiling point medium steam is blocked and the drive of the turbine 2 is stopped. It's starting to stop. When a low boiling point medium is mixed into the lubricating oil, the oiliness decreases as described above, but the specific gravity also decreases. Therefore, by setting the permissible limit for the mixing of low-boiling point media in the lubricating oil, the permissible value for the decrease in the specific gravity of the lubricating oil is also determined. When the value falls below a set value, the main steam stop valve 19a is closed and the turbine 2 is brought to an emergency stop. With this configuration, an accident in which the proportion of low boiling point medium mixed in the lubricating oil becomes excessive and the bearing portion seizes is automatically monitored and automatically prevented.

Furthermore, in this embodiment, the low boiling point medium cooled by the condenser 3 is easily circulated as a cooling medium for the lubricating oil cooler 25, so it can be opened and closed as necessary. valve 37,
38 and the cooling medium inlet 4 of the lubricating oil cooler 25
0, 39 and the on-off valves 37, 3.
8, close the on-off valve 18, or throttle it appropriately to reduce the total flow rate of the low boiling point medium circulation to the lubricating oil cooler 25.
It is also possible to make a part of the low boiling point medium circulation flow branch and flow to the lubricating oil cooler 25. When heat exchange is performed between the low-boiling point medium and the lubricating oil in the lubricating oil cooler 25 in this way, there is no need to obtain a cooling source for the lubricating oil cooler 25 from outside the system, so the whole apparatus can be made compact, and in addition, since the low-boiling point medium is preheated before flowing into the low-boiling point medium steam generator 1, it is advantageous in terms of thermal economy. Furthermore, in this embodiment, the ejector 29
The low boiling point medium vapor used as a driving source for the lubricating oil heater 7 and the low boiling point medium vapor used as a heat source for the lubricating oil heater 7 are returned to the condenser 3 and refluxed into the low boiling point medium circulation system. The low boiling point medium used as a drive source or heat source for these devices can be used repeatedly without being dissipated, making it economical.

FIG. 5 shows details of the low-boiling medium steam generator designated by drawing reference number 1 in FIG.

The low boiling point medium flows in the direction of arrow C, flows through the low boiling point medium steam generator 1 while receiving heat flow 42, and flows out in the direction of arrow D as high temperature steam. This low boiling point medium steam generator 1 is provided with a preheating device 1a and a superheating device 1b, and the low boiling point medium flows through the preheating device 1a to become steam at a temperature close to the boiling point temperature, and then passes through the superheating device 1b. It turns into superheated steam and flows out in the direction of arrow D. In the embodiment shown in FIG. 4, the low-boiling point medium vapor used as the heat source for the lubricating oil heater 7 and the drive source for the ejector 29 was high-temperature vapor that had passed through the entire process of the low-boiling point medium vapor generator 1. However, the low boiling point medium vapor used as the heat source or driving source can also be as follows. That is, a branch pipe 43 is connected and communicated with the communication pipe 1c between the preheating device 1a and the superheating device 1b, and the medium-temperature steam that has passed through the preheating device 1a flows out from the branch pipe 43 in the direction of arrow E. It can also be used as a heat source or a driving source. In such a method, if the heat source of the low boiling point medium steam generator 1 is unstable (for example, when waste heat is used), the temperature of the generated steam is likely to fluctuate, so in such a case, the heat source conditions Depending on the fluctuations in temperature, either the steam that has passed through the superheating device 1b of the low-boiling point medium steam generator 1, or the steam that has passed through the preheating device 1a but has not yet entered the superheating device 1b, at an appropriate temperature. It can be switched and operated as needed. By using such a method, it is possible to switch and adjust the low boiling point medium vapor temperature as the heat source of the lubricating oil heater 7 or the low boiling point medium vapor temperature as the driving source of the ejector 29 in two stages. can.

FIG. 6 shows an embodiment in which the automatic control mechanism in the embodiment shown in FIG. 4 is replaced with a manual control mechanism, with some improvements added. Next, the embodiment shown in FIG. 6 will be explained by extracting only the points that differ from the embodiment shown in FIG. 4.

The variable discharge type lubricating oil pump 44 is connected to the lubricating oil pump 44 so as to suck the lubricating oil in the lubricating oil tank 5 and forcefully feed it to the inlet 46 of the lubricating oil cooler 25 via a pipe 45. Therefore, the pump 44 directly feeds the lubricating oil containing the low boiling point medium in the lubricating oil tank 5 to the lubricating oil cooler 25 without passing through the vacuum deaerator 21, and passes through the cooler 25 to the lubricating oil. It can be supplied to the lubricating section 10'. 47 is a pressure gauge connected to the lubricating oil cooler inlet 46 for displaying this pumping pressure.

Note that a thermometer 48 that displays the temperature near the lubricating oil outlet of the lubricating oil heater 7 and a manual opening/closing valve 49 that controls the flow rate of lubricating oil flowing into the decompression deaerator 21 are connected to the lubricating oil heater 7 and the depressurizer. It is provided in a lubricating oil circulation pipe that connects to the deaerator 21.

In addition, the deaerator 21 is equipped with a pressure gauge 50 that displays the internal pressure, and a manual on-off valve 51 is installed in the low boiling point medium steam supply line to the ejector 29 to adjust the flow rate of the supplied steam. has been done.

52 is a thermometer that displays the lubricating oil outlet temperature of the lubricating oil cooler 25.

53 is an emergency on-off valve provided in a pipe connecting the oil reservoir 23 of the reduced pressure deaerator 21 and the lubricating oil cooler 25.

A manual on-off valve 54 for adjusting the flow rate of steam is interposed in the supply pipe for low-boiling medium steam, which is the heat source of the lubricating oil heater 7 .

55 is an oil level gauge that displays the oil level in the oil reservoir 23 in the vacuum deaerator 21.

In the embodiment shown in FIG. 6, in the unlikely event that the lubricant pump 24 breaks down, the lubricant pump 44 is operated to force-feed the lubricant in the lubricant tank 5 to the lubricant cooler inlet 46, and It is possible to continue supplying lubricating oil to the bearing 10'. At this time, if part of the lubricating oil flow backs up from the lubricating oil inlet 46 toward the failed pump 24, the on-off valve 5
3 to prevent backflow.

In addition, even if the pump 24 is not damaged, if the pressure and circulation of the lubricating oil is malfunctioning for some reason and the oil pressure at the inlet 46 of the lubricating oil cooler 25 becomes unstable, the pump 44 should be operated. At the same time, the delivery amount can be adjusted to assist lubricating oil pressure delivery so that the oil pressure gauge 47 indicates an appropriate value.

Furthermore, while monitoring the readings of the thermometers 48 and 52, the opening degree of the manual on-off valve 54 is adjusted as appropriate to adjust the flow rate of the low boiling point medium that is the heat source of the lubricating oil heater 7, thereby depressurizing and degassing. The preheating temperature of the lubricating oil fed into the container 21 can be maintained appropriately.

Further, while monitoring the index of the pressure gauge 50, the flow rate of the low boiling point medium that is the driving source of the ejector 29 is adjusted by the manual on-off valve 51 to maintain the internal pressure of the decompression deaerator 21 at an appropriate value. You can also do it.

In addition, the oil level in the oil sump 23 is kept constant by adjusting the flow rate of lubricating oil sent to the decompression deaerator 21 by opening and closing the manual on-off valve 49 while monitoring the reading on the oil level gauge 55. You can also do it.

As described above, in the embodiment shown in FIG. 6, the lubricating oil preheating temperature by the lubricating oil heater 7 can be controlled by operating the on-off valve 54 while monitoring each instrument.
Furthermore, the decompression and degassing pressure can be controlled by operating the on-off valve 51 and adjusting the driving force of the ejector 29, so that the same control effect as that previously explained with respect to the embodiment of FIG. 4 can be achieved. can be obtained.

[Brief explanation of the drawing]

Figure 1 is a system diagram of a power generation plant using a low boiling point medium according to the prior art, Figures 2 and 3 are charts showing the physical properties of the low boiling point medium and lubricating oil used in the power generation plant, and Figure 4 The figure is a system diagram of a power generation plant in one embodiment of the present invention, and FIG.
Detailed diagram of the low-boiling medium steam generator shown in fig.
FIG. 6 is a system diagram of a power generation plant in an embodiment different from FIG. 4. DESCRIPTION OF SYMBOLS 1... Low boiling point medium steam generator, 1a... Preheating device, 1b... Superheating device, 2... Turbine, 3... Condenser, 5... Lubricating oil tank, 6... Lubricating oil pump, 7
... Lubricating oil heater, 10... Lubricated part, 10'... Bearing, 14... Airtight seal, 16... Pump, 17...
Pump, 19a...Main steam stop valve, 19b...Main steam control valve, 20, 27, 31...Flow rate adjustment valve, 21...Reducing pressure deaerator, 23...Oil sump, 24, 44
...Pump, 25...Lubricating oil cooler, 28...Temperature detector, 29...Ejector, 32...Pressure detector, 33
...Oil level detector, 34...Valve, 35...Emergency lubrication pipe,
36... Specific gravity measuring device, 37, 38... Manual on-off valve, 4
4...Lubricating oil pump, 45...Pipeline, 47...Pressure gauge,
48, 52... Thermometer, 49, 51, 54... Manual on/off valve, 53... Emergency on/off valve, 50... Pressure gauge, 55
...Oil level gauge.

Claims (1)

[Scope of Claims] 1. In a power generation plant using low-boiling medium steam as a driving source, the lubricating oil flowing through the lubricated parts is preheated and then degassed under reduced pressure to remove the low-temperature oil mixed into the lubricating oil. The boiling point medium is separated, and the lubricating oil from which the low boiling point medium has been separated is cooled and then supplied again to the lubricated oil for circulation, and the low boiling point medium separated from the lubricating oil is collected to generate the electricity. Reflux into the low boiling point medium circulation system that drives the plant,
and a power generation plant using a low boiling point medium, characterized in that the preheating temperature of the lubricating oil and the vacuum pressure in the vacuum degassing are controlled to improve the separation of the low boiling point medium in the lubricating oil. how to drive. 2. A patent characterized in that the preheating of the lubricating oil uses a low boiling point medium vapor, which is a driving source of a power generation plant, as a heat source, and the flow rate of the low boiling point medium vapor is controlled so as to make the lubricating oil preheating temperature appropriate. A method of operating a power plant using the low boiling point medium according to claim 1. 3. The reduced pressure degassing uses a low boiling point medium vapor, which is a driving source of a power generation plant, as a driving source, and the flow rate of the low boiling point medium vapor is controlled so as to make the reduced pressure appropriate. A method of operating a power generation plant using the low boiling point medium according to scope 1. 4. In a power generation plant using low-boiling medium vapor as a driving source, (a) a lubricant tank for storing lubricating oil for the power generating plant, (b) a lubricating oil heater for preheating the lubricating oil, and (c) the lubricating oil heater described above. A vacuum deaerator for reducing the pressure of the preheated lubricating oil and degassing the low boiling point medium contained therein, and a lubricating oil cooler for cooling the degassed lubricating oil. Each of the devices (a), (b), (c), and (d) is provided independently and connected in series, and the low-boiling point medium degassed by the vacuum deaerator is refluxed into the low-boiling point medium circulation system. 1. A power generation plant using a low-boiling point medium, characterized in that a pipeline is provided, and means for controlling the lubricating oil preheating temperature by the lubricating oil heater and means for controlling the vacuum pressure of the vacuum deaerator. 5. The lubricating oil heater uses low boiling point medium vapor, which is the driving source of the power generation plant, as a heat source, and is configured to adjust the lubricating oil temperature by controlling the flow rate of the low boiling point medium vapor used as the heat source. A power generation plant using the low boiling point medium according to claim 4. 6. The vacuum deaerator is equipped with an ejector whose driving source is low boiling point medium vapor, which is the drive source of the power generation plant, and by controlling the flow rate of the low boiling point medium vapor that drives this ejector, the vacuum degassing is performed. 5. A power generation plant using a low boiling point medium according to claim 4, characterized in that the pressure inside the vessel can be adjusted. 7. The lubricating oil cooler can be connected to the circulation pipe for the low boiling point medium via an on-off valve at its cooling medium inlet and outlet, so that the low boiling point medium can be used as the cooling medium. A power generation plant using the low boiling point medium according to claim 4, characterized in that: 8. A power generation plant using a low boiling point medium according to claim 6, wherein the ejector is configured to reflux the low boiling point medium used as a driving source into a low boiling point medium circulation system. 9. The lubricating oil heater uses the low boiling point medium according to claim 5, characterized in that the low boiling point medium used as a heat source is refluxed into the low boiling point medium circulation system. power generation plant. 10 By interposing a pipe line with a lubricant pump between the lubricant tank and the lubricant cooler, the lubricant in the lubricant tank is delivered to the lubricated part via the lubricant cooler. A power generation plant using the low boiling point medium according to claim 4, characterized in that it can be supplied under pressure.