CN210135039U - Organic working medium thermodynamic cycle system for geothermal power station in high-altitude area - Google Patents
Organic working medium thermodynamic cycle system for geothermal power station in high-altitude area Download PDFInfo
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- CN210135039U CN210135039U CN201920992231.3U CN201920992231U CN210135039U CN 210135039 U CN210135039 U CN 210135039U CN 201920992231 U CN201920992231 U CN 201920992231U CN 210135039 U CN210135039 U CN 210135039U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/10—Geothermal energy
Abstract
The utility model belongs to the technical field of new forms of energy, especially be an organic working medium thermodynamic cycle system for geothermal power station in high altitude area, including geothermal loop and the working medium return circuit of establishing ties each other, the input of geothermal loop is equipped with the production pump that is used for supplying with geothermal medium, the output of production pump is connected with the evaporimeter through pipe seal, one end of evaporimeter is connected with the generator through pipe seal, the output of generator is connected with the condenser through pipe seal; cleaning oil enters a steam turbine and a generator through pressurization, a lubricating oil system cools and lubricates bearings of the generator and the steam turbine, a sealing oil system cools and lubricates mechanical seals of the steam turbine and prevents working media from leaking to the atmosphere, each test data can meet requirements after capacity reduction compensation is carried out by arranging a geothermal loop and a working media loop which are mutually connected in series, and each operation data is normal and stable in a unit load test and a full load test.
Description
Technical Field
The utility model belongs to the technical field of the new forms of energy, concretely relates to high altitude area geothermal power station is with organic working medium heating power circulation system.
Background
The water in the geothermal water cannot be directly sent to a steam turbine to do work according to the conventional power generation method, and the water must be input to the steam turbine to do work in a steam state. The method is characterized in that low-boiling-point substances such as ethyl chloride, n-butane, isobutane and freon are used as intermediate media for power generation, underground hot water is heated through a heat exchanger, the low-boiling-point substances are rapidly gasified, generated gas enters a generator to act, working medium after acting is discharged into a condenser from a steam turbine, is cooled through a cooling system, is condensed into liquid working medium again, and then is recycled. This method is called "intermediate medium method", and this system is called "double flow system" or "double medium power generation system".
The power generation system can reduce the corrosion of the steam turbine and the accessory equipment thereof to the maximum extent, prolong the service life of the steam turbine and reduce the maintenance cost, but the power generation system has the biggest defect that the safety of the power generation mode is poor, and if the power generation system is slightly sealed and leaked, accidents are easy to happen after the working medium escapes.
SUMMERY OF THE UTILITY MODEL
To solve the problems set forth in the background art described above. The utility model provides a high altitude area geothermal power plant is with organic working medium thermodynamic cycle system has and is suitable for and uses in high altitude area, and inside medium seal is stable, is difficult to the characteristics of revealing.
In order to achieve the above object, the utility model provides a following technical scheme: an organic working medium thermodynamic cycle system for a geothermal power station in a high-altitude area comprises a geothermal loop and a working medium loop which are connected in series, wherein the input end of the geothermal loop is provided with a production pump for supplying geothermal media, the output end of the production pump is connected with an evaporator in a sealing mode through a pipeline, one end of the evaporator is connected with a generator in a sealing mode through a pipeline, the output end of the generator is connected with a condenser in a sealing mode through a pipeline, the other end of the evaporator is connected with a preheater in a sealing mode through a pipeline, the output end of the preheater is provided with a reflux pump for sending out geothermal media, the geothermal loops are formed among the production pump, the evaporator, the preheater and the reflux pump, the output end of the condenser is connected with the working medium pump through a pipeline, the output end of the working medium pump is connected with the input end of the preheater through a pipeline, the evaporator, the generator, the condenser, the working medium pump and the preheater form the working medium loop.
Preferably, a separator is further installed between the evaporator and the generator, and two ends of the separator are respectively connected with the evaporator and the generator in a sealing manner.
Preferably, the generator is provided with a lubricating oil system and a sealing oil system, the lubricating oil system is a closed-loop system, and the sealing oil system is an open-loop system.
Preferably, a fan for cooling the condenser is installed at one side of the condenser.
Preferably, the electrical equipment involved in the geothermal loop and the working medium loop are both capacity reduction compensated equipment, and the capacity reduction coefficient is zero point eight.
Preferably, a system leakage test and a vacuum test are carried out before the geothermal loop and the working medium loop operate.
Compared with the prior art, the beneficial effects of the utility model are that:
the utility model discloses in, the lubricating oil system working process in this device is closed loop circulation, and sealed oil system is the open loop system, according to the condition to sealed oil tank supplementary sealing oil, and cleaning oil gets into steam turbine and generator through the pressurization, the bearing of lubricating oil system cooling and lubricated generator and steam turbine, sealed oil system cooling and lubricated turbine mechanical seal to prevent that the working medium from leaking the atmosphere.
The utility model discloses in, through setting up the geothermal loop and the working medium return circuit of establishing ties each other, and all electrical equipment of local heat engine group all select to be the plateau type, promptly through falling the appearance compensation back, consequently also all test according to the debugging rule in normal debugging process, each test data homoenergetic satisfies the requirement, in unit load test and full load test, each operational data is also all normally stable.
Drawings
The accompanying drawings are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention, and together with the description serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic diagram of the system of the present invention;
fig. 2 is a flow chart of the present invention.
In the figure: A. a geothermal loop; B. a working medium loop; 1. a production pump; 2. an evaporator; 21. a separator; 3. a generator; 31. a lubricating oil system; 32. sealing the oil system; 4. a condenser; 5. a working medium pump; 6. a preheater; 7. a reflux pump.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
Referring to fig. 1, the present invention provides the following technical solutions: an organic working medium thermodynamic cycle system for a geothermal power station in a high-altitude area comprises a geothermal loop A and a working medium loop B which are connected in series, wherein the input end of the geothermal loop A is provided with a production pump 1 for supplying geothermal media, the output end of the production pump 1 is connected with an evaporator 2 through a pipeline seal, one end of the evaporator 2 is connected with a generator 3 through a pipeline seal, the output end of the generator 3 is connected with a condenser 4 through a pipeline seal, the other end of the evaporator 2 is connected with a preheater 6 through a pipeline seal, the output end of the preheater 6 is provided with a reflux pump 7 for sending out geothermal media, the production pump 1, the evaporator 2, the geothermal loop A is formed between the preheater 6 and the reflux pump 7, the output end of the condenser 4 is connected with a working medium pump 5 through a pipeline, the output end of the working medium pump 5 is connected with the input end of the preheater 6 through a pipeline, the evaporator 2, the generator 3, the condenser 4, the working medium pump 5 and the preheater 6 form a working medium loop B.
In the embodiment, the geothermal loop A and the working medium loop B which are connected in series are arranged, all electrical equipment of the local heat engine unit is selected as a plateau type, namely, after capacity reduction compensation, the test is carried out according to a debugging rule in a normal debugging process, all test data can meet requirements, and all operation data are normal and stable in an on-load test and a full-load test of the unit.
Specifically, still install separator 21 between evaporimeter 2 and the generator 3, the both ends of separator 21 respectively with evaporimeter 2 and generator 3 sealing connection, shell side power fluid utilizes tube side salt solution and condensate to heat in preheater 6, the heating is increased gradually in every preheater 6, power fluid heats the back in last preheater, with the pipe transportation to boiling in the evaporimeter, power fluid steam then passes through separator 21 that is located the evaporimeter top, the liquid droplet that steam carried is separated out to prevent that power fluid steam from causing the striking to the turbine blade when getting into generator 3.
Specifically, the generator 3 is provided with a lubricating oil system 31 and a sealing oil system 32, the lubricating oil system 31 is a closed-loop system, the working process of the lubricating oil system 31 is closed-loop circulation, the sealing oil system 32 is an open-loop system, because oil loss is caused, sealing oil needs to be supplemented to a sealing oil tank according to the situation, cleaning oil enters the turbine and the generator through pressurization, and the lubricating oil system cools and lubricates the bearings of the generator and the turbine; the sealing oil system 32 cools and lubricates the mechanical seal of the turbine and prevents the working medium from leaking to the atmosphere, and after the oil circulation is qualified, the outlet pressure of the lubricating oil pump is set to be 0.64MPa, and the outlet pressure of the sealing oil pump is set to be 0.71 MPa.
Specifically, a fan used for cooling the condenser 4 is installed on one side of the condenser 4, a system leakage test and a vacuum test are conducted before the geothermal loop A and the working medium loop B run, an air cooling system is used for cooling air, working medium steam discharged by the generator 3 is condensed into liquid through the fan, in order to guarantee that the system is tight, the system leakage test and the vacuum test are completed, and the system smoothly flushes the medium isopentane after the test is completed.
Specifically, electrical equipment related to a geothermal loop A and a working medium loop B are capacity reduction compensation equipment, the capacity reduction coefficient is zero eight, and the geothermal power station is located at a position of 4600 meters of a Tibet altitude, and the high altitude is characterized by low air pressure, low air density, low oxygen content of air, low air temperature and the like, so that the equipment is greatly influenced, firstly, the temperature rise of the electrical equipment is increased in an area with low air pressure and low air density, the heat dissipation efficiency is reduced, and the insulation is reduced, so that the equipment is produced according to the characteristics of a working area when the equipment is produced, for example, a self-cooling transformer is changed into forced air cooling in a plateau area, secondly, the capacity reduction problem of the electrical equipment is solved, the capacity reduction coefficient requirements of the electrical equipment in the following table are different according to different altitudes, and the capacity reduction table of a circuit breaker is formed by:
therefore, the capacity reduction coefficient of the transformer needs to be particularly noticed in the debugging process of the equipment, and usually equipment manufacturers have capacity reduction coefficient compensation in the production process of the equipment, for example, to produce a transformer with a capacity of 2000KVA, the capacity reduction coefficient is 0.8 according to the altitude where the transformer works, and the actual capacity when the transformer is produced is 2000/0.8-2500 KVA, so that the capacity reduction problem in a high altitude area can be effectively avoided, and problems such as insulation level, temperature rise and the like need to be noticed in the debugging process.
Referring to fig. 2, the working principle and the using process of the present invention are as follows:
a starting step:
step 1- -turn off OEC, inactive, ready to run.
Turbine bearing lube pump shut down.
The turbine seal oil pump is activated and started to maintain the seal oil pressure at the set value.
Turbine mechanical seal oil cooling fan shut down.
Turbine bearing lube cooling fan shut down.
Feed pump off.
The condensate pump is turned off.
Turbine lube system solenoid valve closed.
Turbine main valve, injection valve and drain valve are closed.
Heat source, steam, non-condensable gas and condensate valve closed.
The air-cooled condenser 4 fan is off.
Lubricating oil System 313H2And S, activating a filtering system.
The evaporator 2 overpressure protection control circuit is activated only by the turbine bypass valve.
Step 2- -starting OEC
The OEC auxiliary equipment starts up and settles within normal operating condition ranges.
The lube system solenoid valve is open.
Turbine bearing lube pump start-up.
The lubricating oil system 313 cooling water pump B was started, operated for 1 minute, and then stopped, and the cooling water pump a was started.
The lube oil cooling fan is activated and operated to maintain the lube oil temperature at the set point.
The seal oil cooling fan is started.
Step 3- -turbine Inlet Assembly Drain
The main and injection valves are opened to ensure that the turbine inlet and exhaust lines drain condensed power fluid.
The main valve and turbine drain valve were opened for 15 seconds and then closed.
After 10 seconds, the turbine injection valve and turbine drain shut-off valve were opened for 15 seconds and then closed.
This step was repeated twice to ensure complete line drainage.
Step 4- -initial heating
The high-pressure feed pump starts operating according to the evaporator 2 level sensor. The PID feedback control loop transmits signals to the pump for frequency conversion control so as to control the pump speed. A signal is also transmitted to the level control valve of the evaporator 2 in order to maintain a predetermined level in the evaporator 2.
The heat source control valve, the non-condensable gas valve and the steam inlet valve are controlled by a PID feedback control loop so as to maintain a predetermined pressure in the evaporator 2. These valves control the flow of steam and brine through the heat exchanger, thereby controlling the heat load introduced into the system.
The condensate pump starts operating according to the condensate level sensor. The PID feedback control loop transmits a signal to the condensate level control valve to maintain a predetermined evaporator 2 level.
The turbine bypass valve is controlled by a PID feedback control loop to prevent the evaporator 2 from exceeding a predetermined pressure.
The ACC fan starts operating according to the turbine outlet pressure and the condenser motive fluid outlet temperature.
A clockwise cooling fan activation of the oil system 313.
When the evaporator 2 pressure reaches a predetermined value, the OEC will start to proceed to step 5.
Step 5- -acceleration and synchronization
Turbine 'a' branch main valve open.
Turbine 'a' branch injection valve opens and accelerates the turbine to synchronous speed.
The governor control device controls and controls the position of the injection valve based on the PLC speed set value.
The heat source control valve, non-condensable gas valve and steam inlet valve are controlled by a PID feedback control loop to maintain a predetermined evaporator 2 pressure by regulating the steam and brine heat source flow.
The evaporator 2 pressure set point is controlled in cascade, changing the set point to maintain the desired turbine injection valve opening percentage.
The turbine bypass valve is controlled by a PID feedback control loop to prevent the evaporator 2 from exceeding a predetermined pressure.
The evaporator 2 power fluid level control operates based on data from the evaporator 2 level sensor. The PID feedback control loop transmits a signal to the high pressure feed pump and the evaporator 2 level control valve to maintain a predetermined evaporator 2 level.
Vapor recovery device system activation.
Turbine seal chamber cooling valve open.
The ACC fan continues to operate as a function of turbine outlet pressure and condenser motive fluid outlet temperature.
Turbine speed reaches a minimum of 800 rpm. Stabilize for 2 minutes.
The lube oil system 313 exciter is activated when the turbine reaches 1000 rpm.
The synchronization system activates when the turbine exceeds 1400 rpm.
System check voltage and frequency.
The automatic synchronous machine compares the lubricating oil system 313 frequency, voltage and phase angle with the grid. Correction signal transmission speed and voltage
And a control device.
Step 6- -Power Generation- -Normal operation
Closing the lube system 313 outlet breaker switch when the lube system 313 frequency, voltage and phase angle are synchronized to the grid.
When the switch is successfully closed, the lubrication system 313 is connected to the grid.
The heat source control valve, the non-condensable gas valve and the steam inlet valve are controlled by a PID feedback control loop so as to:
maintaining the motive fluid evaporator 2 pressure at a predetermined value.
Maintaining the power output of the lubrication oil system 313 below a predetermined value.
Step 7- -Normal shutdown
After step 6, if the operator changes the control system mode to "off" (moves the plant control switch to "off)
Closed "position or pressing" off "soft button on the human machine communication interface), or in case of fatal failure, the OEC control system will proceed to step 7.
Turbine main valve closing.
Turbine injection valve closing.
Turbine exhaust valve closing.
The turbine bypass valve is controlled by a PID feedback control loop to prevent the evaporator 2 from exceeding a predetermined pressure.
Heat source control valve, non-condensable gas valve and steam inlet valve are closed.
After the main valve was closed for 3 seconds, the CB-1 lube system 313 breaker was disconnected from the grid.
The exciter field is disconnected from the lubricating oil system 313.
When the turbine speed drops to 150 rpm, the turbine timer stops and the seal chamber cooling valve closes.
After the turbine speed decreased to 150 rpm for 10 minutes, the lube oil electric pump was stopped.
If no fault exists, the OEC will go to step 1- -shut down after the turbine and lube system 313 is completely shut down for 10 minutes.
Step 8- -failure
The high pressure feed pump is stopped.
All motors are disconnected.
Control system failure
Turbine protection shutdown.
Step 9- -Emergency shutdown
Pressing the emergency stop button on the power skid steer or relay will produce the following results:
turbine main valve closing.
Turbine injection valve closing.
Turbine exhaust valve closing.
Heat source control valve, non-condensable gas valve and steam inlet valve are closed.
The lube system 313 outlet circuit breaker trips 3 seconds after the main valve closes.
All motors are disconnected.
The turbine comes to a complete stop.
Seal chamber cooling valve closed.
When no fault exists, a "reset" soft button on the human machine communication interface is pressed, and the OEC will go to step 1 to shut down.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described in the foregoing embodiments, or equivalents may be substituted for elements thereof. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (6)
1. An organic working medium thermodynamic cycle system for a geothermal power station in a high-altitude area is characterized in that: the geothermal energy recycling system comprises a geothermal loop (A) and a working medium loop (B) which are connected in series, wherein the input end of the geothermal loop (A) is provided with a production pump (1) for supplying geothermal media, the output end of the production pump (1) is connected with an evaporator (2) through a pipeline in a sealing manner, one end of the evaporator (2) is connected with a generator (3) through a pipeline in a sealing manner, the output end of the generator (3) is connected with a condenser (4) through a pipeline in a sealing manner, the other end of the evaporator (2) is connected with a preheater (6) through a pipeline in a sealing manner, the output end of the preheater (6) is provided with a reflux pump (7) for sending out geothermal media, the geothermal loop (A) is formed among the production pump (1), the evaporator (2), the preheater (6) and the reflux pump (7), the output end of the condenser (4) is connected, the output end of the working medium pump (5) is connected with the input end of the preheater (6) through a pipeline, the output end of the preheater (6) is connected with the evaporator (2) in a sealing mode, and the evaporator (2), the generator (3), the condenser (4), the working medium pump (5) and the preheater (6) form the working medium loop (B).
2. The organic working medium thermodynamic cycle system for the geothermal power plant in the high altitude region as claimed in claim 1, wherein: still install separator (21) between evaporimeter (2) with generator (3), the both ends of separator (21) respectively with evaporimeter (2) with generator (3) sealing connection.
3. The organic working medium thermodynamic cycle system for the geothermal power plant in the high altitude region as claimed in claim 1, wherein: the generator (3) is provided with a lubricating oil system (31) and a sealing oil system (32), the lubricating oil system (31) is a closed-loop system, and the sealing oil system (32) is an open-loop system.
4. The organic working medium thermodynamic cycle system for the geothermal power plant in the high altitude region as claimed in claim 1, wherein: and a fan used for cooling the condenser (4) is installed on one side of the condenser (4).
5. The organic working medium thermodynamic cycle system for the geothermal power plant in the high altitude region as claimed in claim 1, wherein: and electrical equipment involved in the geothermal loop (A) and the working medium loop (B) are capacity reduction compensated equipment, and the capacity reduction coefficient is zero point eight.
6. The organic working medium thermodynamic cycle system for the geothermal power plant in the high altitude region as claimed in claim 1, wherein: and carrying out a system leakage test and a vacuum test before the operation of the geothermal loop (A) and the working medium loop (B).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920992231.3U CN210135039U (en) | 2019-06-27 | 2019-06-27 | Organic working medium thermodynamic cycle system for geothermal power station in high-altitude area |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920992231.3U CN210135039U (en) | 2019-06-27 | 2019-06-27 | Organic working medium thermodynamic cycle system for geothermal power station in high-altitude area |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111897379A (en) * | 2020-07-13 | 2020-11-06 | 武汉第二船舶设计研究所(中国船舶重工集团公司第七一九研究所) | Lubricating oil cooling and heating system |
| CN112816265A (en) * | 2021-01-06 | 2021-05-18 | 中国电建集团贵阳勘测设计研究院有限公司 | Automatic time-sharing collection device for rice field leakage water |
-
2019
- 2019-06-27 CN CN201920992231.3U patent/CN210135039U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111897379A (en) * | 2020-07-13 | 2020-11-06 | 武汉第二船舶设计研究所(中国船舶重工集团公司第七一九研究所) | Lubricating oil cooling and heating system |
| CN112816265A (en) * | 2021-01-06 | 2021-05-18 | 中国电建集团贵阳勘测设计研究院有限公司 | Automatic time-sharing collection device for rice field leakage water |
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