CN111594280B - Dual-turbine gas suspension ORC power generation system and control method - Google Patents
Dual-turbine gas suspension ORC power generation system and control method Download PDFInfo
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- CN111594280B CN111594280B CN202010579888.4A CN202010579888A CN111594280B CN 111594280 B CN111594280 B CN 111594280B CN 202010579888 A CN202010579888 A CN 202010579888A CN 111594280 B CN111594280 B CN 111594280B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D15/00—Adaptations of machines or engines for special use; Combinations of engines with devices driven thereby
- F01D15/10—Adaptations for driving, or combinations with, electric generators
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D13/00—Combinations of two or more machines or engines
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D17/00—Regulating or controlling by varying flow
- F01D17/10—Final actuators
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D17/00—Regulating or controlling by varying flow
- F01D17/10—Final actuators
- F01D17/12—Final actuators arranged in stator parts
- F01D17/14—Final actuators arranged in stator parts varying effective cross-sectional area of nozzles or guide conduits
- F01D17/141—Final actuators arranged in stator parts varying effective cross-sectional area of nozzles or guide conduits by means of shiftable members or valves obturating part of the flow path
- F01D17/145—Final actuators arranged in stator parts varying effective cross-sectional area of nozzles or guide conduits by means of shiftable members or valves obturating part of the flow path by means of valves, e.g. for steam turbines
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D25/00—Component parts, details, or accessories, not provided for in, or of interest apart from, other groups
- F01D25/08—Cooling; Heating; Heat-insulation
- F01D25/12—Cooling
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D25/00—Component parts, details, or accessories, not provided for in, or of interest apart from, other groups
- F01D25/16—Arrangement of bearings; Supporting or mounting bearings in casings
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K11/00—Plants characterised by the engines being structurally combined with boilers or condensers
- F01K11/02—Plants characterised by the engines being structurally combined with boilers or condensers the engines being turbines
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K13/00—General layout or general methods of operation of complete plants
- F01K13/02—Controlling, e.g. stopping or starting
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K7/00—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating
- F01K7/16—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating the engines being only of turbine type
- F01K7/165—Controlling means specially adapted therefor
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B39/00—Evaporators; Condensers
- F25B39/02—Evaporators
Abstract
The application relates to a double-turbine gas suspension ORC power generation system and a control method, wherein an expansion power generation unit comprises a left turbine, a gas suspension bearing power generator and a right turbine; the air inlet of the left turbine is communicated with the air inlet of the right turbine; the air outlet of the left turbine is communicated with the air outlet of the right turbine. The evaporator is a combined flooded evaporator; the outlet of the preheating section of the evaporator is connected with a generator of the expansion generator set through a liquid supply cooling pipeline; an air inlet pipeline and a bypass thereof are arranged between the outlet of the evaporation section of the evaporator and the expansion generating set. The expander adopted in the application is a symmetrical double-turbine gas suspension expander, and the ORC system realizes oil-free operation and has simple structure and high power generation efficiency; the expansion machine is provided with the bypass pipeline and the control valve, so that the expansion machine can be effectively protected, the air inflow is larger, and compared with a screw rod and a turbine ORC generator set with the same generated energy, the size is small, and the system efficiency is high.
Description
Technical Field
The application relates to the technical field of industrial waste heat recovery and clean energy, in particular to a double-turbine gas suspension ORC power generation system and a control method.
Background
Organic Rankine Cycle (ORC) is a technology that uses a low boiling point organic working medium (such as a refrigerant), and uses a heat source with a lower temperature to complete the phase change of the organic working medium, thereby realizing the power generation of the rankine cycle. The liquid organic working medium is heated by low-temperature waste heat in an evaporator (sometimes called a waste heat exchanger) to generate high-temperature high-pressure gas, the high-temperature high-pressure gas is expanded by an expander to drive a generator to generate electric energy, the low-temperature low-pressure gaseous working medium after passing through the expander is cooled into liquid in a condenser, and the liquid is pressurized by a refrigerant pump and sent back to the evaporator to complete a cycle. The ORC waste heat power generation technology has the problems of low cycle efficiency, low power generation capacity, high operation and maintenance cost and long investment reporting period. The expansion generator is a key device for limiting the performance of the ORC unit, and mainly comprises two types, namely a screw machine and a centripetal turbine expander. The screw machine can run at a low speed, directly drives the power frequency generator to generate electricity, and the centripetal turbine rotates at a high speed and drives the power frequency motor to generate electricity after being decelerated by the gear box.
In the prior art, the application number is 2019108354914, the application discloses a radial expansion generator set of an ORC (organic Rankine cycle) system based on a static pressure air bearing, a bidirectional core turbine is adopted in the expansion generator set and is symmetrically arranged on two sides of a motor, a static pressure air bearing is adopted for supporting a generator rotating shaft of the expansion generator set, a refrigerant in the system is adopted for lubricating liquid of the static pressure air bearing, no lubricating oil pollution is caused, and bearing loss is reduced; the cooling refrigerant of the expansion generating set enters from the bottom of the motor and is discharged into the condenser after being discharged from the discharge port. The above prior art has the following problems: : (1) The screw rod and the turbine generator set with the same generating capacity are large in size, limited in installation and low in generating efficiency (2) the cooling loop of the motor needs to be fed with the coolant through the coolant pump, and the structure is relatively complex and is not beneficial to popularization and utilization. (3) Only the construction of a two-stage turbine is disclosed in the prior art as being involved in power generation. Therefore, the power generation state or the power off state can be switched according to the operation parameters of the expansion generator, and the power supply cooling pipeline provided with the pressure stabilizing pump can be switched, so that accidents are effectively prevented, and the energy conversion efficiency is improved.
Disclosure of Invention
1. The technical problems to be solved are as follows:
aiming at the technical problems, the application provides a double-turbine gas suspension ORC power generation system, wherein a static pressure air bearing is adopted by an expansion power generation unit, so that friction loss is lower, and power generation efficiency is high; by adopting the double-turbine structure, the working condition with high expansion ratio is practical, and the system efficiency is higher; the bypass loop of the air inlet structure is adopted to protect the expander; the liquid supply cooling pipeline is provided with a pressure stabilizing pump with a bypass, and the on-off is controlled through an electromagnetic valve, so that the pressure supply stability of the air suspension bearing is ensured.
2. The technical scheme is as follows:
a double-turbine gas suspension ORC power generation system comprises an evaporator, an expansion generating set, a condenser, a working medium pump and the evaporator which are circularly connected; the method is characterized in that: the expansion generating set comprises a left turbine, an air suspension bearing generator and a right turbine; the air inlet of the left turbine is communicated with the air inlet of the right turbine; and the air outlet of the left turbine is communicated with the air outlet of the right turbine.
The evaporator is a combined flooded evaporator, an inner partition plate with liquid equalizing holes is arranged in an inner cavity of the combined flooded evaporator to divide the evaporator into an upper part and a lower part which are communicated, the upper part is a flooded evaporation section, and the lower part is a working medium preheating section.
The preheating section outlet of the evaporator is connected with a generator of the expansion generator set through a liquid supply cooling pipeline; the liquid supply cooling pipeline comprises an evaporator preheating section outlet, a stabilized pressure pump electromagnetic valve, a stabilized pressure pump and a coolant inlet of the air suspension bearing generator which are connected in sequence; the liquid supply cooling pipeline also comprises a bypass liquid supply cooling pipeline which is connected with the solenoid valve of the stabilized pump in parallel with the pipeline where the stabilized pump is positioned; the bypass feed liquid cooling pipeline comprises a bypass stabilized pump electromagnetic valve; the solenoid valve of the stabilized pump and the solenoid valve of the bypass stabilized pump are in an interlocking state.
An air inlet pipeline is arranged between the outlet of the evaporation section of the evaporator and the expansion generator set; the air inlet pipeline comprises an evaporation section outlet, an air inlet valve, a left turbine air inlet and a right turbine air inlet of the evaporator which are sequentially connected; the air inlet pipeline further comprises a bypass passage of the air inlet pipeline; the bypass passage of the air inlet pipeline comprises an evaporation section outlet of the evaporator, a bypass valve and air outlets of the two turbines which are connected in sequence.
Further, the expansion generating set is an integrated generating set; wherein the air suspension bearing generator is a variable-rotation-speed permanent magnet generator; the rotor in the variable-speed permanent magnet generator rotates along with the rotating shaft; impellers are respectively arranged at two ends of the rotating shaft to form two turbines; the air inlet pipe of one turbine is connected with the air inlet pipe of the other turbine, and a left turbine and a right turbine are correspondingly formed.
A control method of a dual turbine gas suspension ORC power generation system, comprising:
step one: the system starts to operate, the air inlet valve is closed, the bypass valve is opened, organic working medium vapor enters the condenser through the bypass passage, is cooled by an external cold source in the condenser and is condensed into liquid working medium, and then the liquid working medium is pumped into a preheating section of the combined full-liquid evaporator through the working medium pump; the high-pressure working medium is conveyed to the generator cavity and the air suspension bearing through the liquid supply cooling pipeline and is used for cooling the generator and supplying air to the air suspension bearing; detecting the organic working air pressure of the air inlet valve, and if the organic working air pressure of the air inlet valve is within the preset normal working air pressure, opening the air inlet valve and closing the bypass valve; the organic working medium simultaneously enters a left turbine and a right turbine to drive a generator to do work for power generation, the exhaust gas after work enters a condenser to be condensed into liquid working medium, and the liquid working medium is pumped into an evaporator through a working medium pump to complete the whole cycle.
Step two: detecting the outlet air pressure of a preheating section of the evaporator, if the air pressure is higher than the preset air pressure of the cooling pipeline, opening a solenoid valve of the stabilized pressure pump, and closing a solenoid valve of the bypass stabilized pressure pump; if the air pressure is lower than the air pressure of a preset cooling pipeline of the liquid supply, closing a solenoid valve of the stabilized pump, opening a solenoid valve of the bypass stabilized pump, and keeping the pressure obtained by the air suspension bearing of the air suspension bearing generator stable through the stabilized pump.
Step three: when the machine is stopped, the bypass valve is opened from a closed state, and the air inlet valve is closed from an open state; the gaseous organic working medium enters the condenser through the bypass valve; and the evaporator does not exchange heat any more until the external heat source is closed, and the working medium pump is stopped.
3. The beneficial effects are that:
(1) The expander adopted in the application is a symmetrical double-turbine gas suspension expander, and the ORC system realizes oil-free operation and has simple structure and high power generation efficiency; the air inflow is larger, compared with a screw rod and a turbine ORC generator set with the same generating capacity, the size is small, and the system efficiency is high.
(2) According to the application, the expander bypass pipeline is arranged, so that expander protection in a start-stop state is realized; the motor is cooled and the air suspension bearing is pressurized by a combined full-liquid evaporator with liquid storage and a liquid cooling pipeline. And the combined evaporator with the functions of preheating and liquid storage can effectively reduce the size of a unit and reduce the equipment cost.
(3) The liquid supply cooling pipeline is provided with the stabilized pump with the bypass, so that the stable operation of the system under the working condition of large fluctuation of a heat source is ensured.
Drawings
FIG. 1 is a diagram showing the overall structure of the present application;
fig. 2 is a schematic diagram of a combined flooded evaporator in accordance with the application.
Detailed Description
The present application will be described in detail with reference to the accompanying drawings.
As shown in fig. 1 to 2, a double-turbine gas suspension ORC power generation system comprises an evaporator 1, an expansion generating set, a condenser 7, a working medium pump 8 and the evaporator 1 which are circularly connected; the method is characterized in that: the expansion generating set comprises a left turbine 4, an air suspension bearing generator 6 and a right turbine 5; the air inlet of the left turbine 4 is communicated with the air inlet of the right turbine 5; the air outlet of the left turbine 4 is communicated with the air outlet of the right turbine 5.
The evaporator 1 is a combined flooded evaporator 1, an inner partition plate with liquid equalizing holes is arranged in the inner cavity of the combined flooded evaporator 1 to divide the evaporator 1 into an upper part and a lower part which are communicated, the upper part is a flooded evaporation section 18, and the lower part is a working medium preheating section 19.
The preheating section outlet of the evaporator is connected with a generator of the expansion generator set through a liquid supply cooling pipeline; the liquid supply cooling pipeline comprises an evaporator preheating section outlet, a stabilized pressure pump electromagnetic valve 12, a stabilized pressure pump 11 and a coolant inlet of the air suspension bearing generator 6 which are connected in sequence; the liquid supply cooling pipeline also comprises a bypass liquid supply cooling pipeline which is connected with the solenoid valve 12 of the steady-pressure pump in parallel; the bypass feed liquid cooling pipeline comprises a bypass pressure stabilizing pump electromagnetic valve 13; the booster pump solenoid valve 12 and the bypass booster pump solenoid valve 13 are in an interlocked state.
An air inlet pipeline is arranged between the outlet of the evaporation section of the evaporator 1 and the expansion generator set; the air inlet pipeline comprises an evaporation section outlet of the evaporator 1, an air inlet valve 2, a left turbine air inlet and a right turbine air inlet which are sequentially connected; the air inlet pipeline further comprises a bypass passage of the air inlet pipeline; the bypass passage of the air inlet pipeline comprises an evaporation section outlet of the evaporator 1, a bypass valve 3 and air outlets of the two turbines which are connected in sequence.
Further, the expansion generating set is an integrated generating set; wherein the air suspension bearing generator is a variable-rotation-speed permanent magnet generator; the rotor in the variable-speed permanent magnet generator rotates along with the rotating shaft; impellers are respectively arranged at two ends of the rotating shaft to form two turbines; the air inlet pipe of one turbine is connected with the air inlet pipe of the other turbine, and a left turbine and a right turbine are correspondingly formed.
A control method of a dual turbine gas suspension ORC power generation system, comprising:
step one: the system starts to operate, the air inlet valve is closed, the bypass valve is opened, organic working medium vapor enters the condenser through the bypass passage, is cooled by an external cold source in the condenser and is condensed into liquid working medium, and then the liquid working medium is pumped into a preheating section of the combined full-liquid evaporator through the working medium pump; the high-pressure working medium is conveyed to the generator cavity and the air suspension bearing through the liquid supply cooling pipeline and is used for cooling the generator and supplying air to the air suspension bearing; detecting the organic working air pressure of the air inlet valve, and if the organic working air pressure of the air inlet valve is within the preset normal working air pressure, opening the air inlet valve and closing the bypass valve; the organic working medium simultaneously enters a left turbine and a right turbine to drive a generator to do work for power generation, the exhaust gas after work enters a condenser to be condensed into liquid working medium, and the liquid working medium is pumped into an evaporator through a working medium pump to complete the whole cycle.
Step two: detecting the outlet air pressure of a preheating section of the evaporator, if the air pressure is higher than the preset air pressure of the cooling pipeline, opening a solenoid valve of the stabilized pressure pump, and closing a solenoid valve of the bypass stabilized pressure pump; if the air pressure is lower than the air pressure of a preset cooling pipeline of the liquid supply, closing a solenoid valve of the stabilized pump, opening a solenoid valve of the bypass stabilized pump, and keeping the pressure obtained by the air suspension bearing of the air suspension bearing generator stable through the stabilized pump.
Step three: when the machine is stopped, the bypass valve is opened from a closed state, and the air inlet valve is closed from an open state; the gaseous organic working medium enters the condenser through the bypass valve; and the evaporator does not exchange heat any more until the external heat source is closed, and the working medium pump is stopped.
Specific examples:
the power generation principle of the ORC system is as follows: the heat source is communicated with the evaporator 1 to transfer heat energy to the organic working medium through heat exchange, the organic working medium absorbs heat and evaporates, and the organic working medium enters the expander to apply work to push the turbine to rotate so as to drive the generator to generate electricity.
When the system is started, liquid organic working medium in the evaporator 1 absorbs heat of a heat source and evaporates to become gaseous working medium, a system bypass valve 3 is opened, an air inlet valve 2 is closed, organic working medium vapor enters a condenser 7 through a bypass pipeline, is cooled by an external cold source in the condenser 7 and condensed into liquid working medium, then the liquid working medium is pumped into a preheating section of the combined full-liquid evaporator 1 through a working medium pump to operate, and high-pressure working medium is conveyed to a cavity of a generator 6 and an air suspension bearing through a liquid supply cooling pipeline to be used for cooling the generator and air supply of the air suspension bearing.
When the normal operation condition of the expander is met, the air inlet valve 2 is opened, the bypass valve 3 is closed, the organic working medium simultaneously enters the left turbine 4 and the right turbine 5, the generator 6 is driven to do work for generating electricity, the exhaust gas after doing work enters the condenser 7 to be condensed into liquid working medium, and the liquid working medium is pumped into the evaporator 1 through the working medium pump 8, so that the whole cycle is completed.
When the system needs to be shut down, the bypass valve 3 is opened from a closed state, the air inlet valve 2 is closed from an open state, and gaseous organic working medium enters the condenser 7 through the bypass valve 3. Until the external heat source is turned off, the evaporator 1 does not exchange heat any more, and the working medium pump 8 stops.
In the system, the liquid supply cooling pipeline is provided with the pressure stabilizing pump 11, and the pressure stability of the liquid supply cooling pipeline is ensured through the pressure stabilizing pump 11 aiming at the working condition that the flow and the pressure fluctuation of a heat source are large, so that the pressure obtained by the gas suspension bearing is kept stable. Wherein the pressure stabilizing pump electromagnetic valve 12 and the bypass pressure stabilizing pump electromagnetic valve 13 are in an interlocking state, and keep one on and one off. And the starting and stopping of the pressure stabilizing pump are controlled through switching of the electromagnetic valve.
Fig. 2 is a schematic diagram of the internal structure of the combined flooded evaporator, and the lower part of the heat exchanger is a preheating section with a liquid storage function. The heat exchanger is internally divided into an upper part and a lower part by an internal baffle plate with liquid equalizing holes, the upper part is a flooded evaporation section, and the lower part is a working medium preheating section. In the figure, the solid line indicates the running direction of the organic working medium, and the dotted line indicates the flow direction of the heat source. In the figure, a 14-position heat source inlet, a 15-position heat source outlet, a 16-position working medium inlet and a 17-position working medium outlet are adopted.
While the application has been described with reference to the preferred embodiments, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the application, and it is intended that the scope of the application shall be defined by the appended claims.
Claims (1)
1. A control method of a double-turbine gas suspension ORC power generation system is characterized by comprising the following steps of: the double-turbine gas suspension ORC power generation system comprises an evaporator (1), an expansion generating set, a condenser (7), a working medium pump (8) and the evaporator (1) which are circularly connected; the method is characterized in that: the expansion generating set comprises a left turbine (4), an air suspension bearing generator (6) and a right turbine (5); the air inlet of the left turbine (4) is communicated with the air inlet of the right turbine (5); the air outlet of the left turbine (4) is communicated with the air outlet of the right turbine (5);
the evaporator (1) is a combined flooded evaporator (1), an inner partition plate with a liquid equalizing hole is arranged in the inner cavity of the combined flooded evaporator (1) to divide the evaporator (1) into an upper part and a lower part which are communicated, the upper part is a flooded evaporation section (18), and the lower part is a working medium preheating section (19);
the preheating section outlet of the evaporator is connected with a generator of the expansion generator set through a liquid supply cooling pipeline; the liquid supply cooling pipeline comprises an evaporator preheating section outlet, a steady pressure pump electromagnetic valve (12), a steady pressure pump (11) and a coolant inlet of the air suspension bearing generator (6) which are connected in sequence; the liquid supply cooling pipeline also comprises a bypass liquid supply cooling pipeline which is connected with the solenoid valve (12) of the stabilized pump in parallel with the pipeline where the stabilized pump is positioned; the bypass feed liquid cooling pipeline comprises a bypass pressure stabilizing pump electromagnetic valve (13); the pressure stabilizing pump electromagnetic valve (12) and the bypass pressure stabilizing pump electromagnetic valve (13) are in an interlocking state;
an air inlet pipeline is arranged between the outlet of the evaporation section of the evaporator (1) and the expansion generator set; the air inlet pipeline comprises an evaporation section outlet of the evaporator (1), an air inlet valve (2), a left turbine air inlet and a right turbine air inlet which are sequentially connected; the air inlet pipeline further comprises a bypass passage of the air inlet pipeline; the bypass passage of the air inlet pipeline comprises an evaporation section outlet of the evaporator (1), a bypass valve (3) and air outlets of the two turbines which are connected in sequence;
the expansion generator set is an integrated generator set; wherein the air suspension bearing generator is a variable-rotation-speed permanent magnet generator; the rotor in the variable-speed permanent magnet generator rotates along with the rotating shaft; impellers are respectively arranged at two ends of the rotating shaft to form two turbines; the air inlet pipe of one turbine is connected with the air inlet pipe of the other turbine, and a left turbine and a right turbine are correspondingly formed;
the control method of the double-turbine gas suspension ORC power generation system comprises the following steps:
step one: the system starts to operate, the air inlet valve is closed, the bypass valve is opened, organic working medium vapor enters the condenser through the bypass passage, is cooled by an external cold source in the condenser and is condensed into liquid working medium, and then the liquid working medium is pumped into a preheating section of the combined full-liquid evaporator through the working medium pump; the high-pressure working medium is conveyed to the generator cavity and the air suspension bearing through the liquid supply cooling pipeline and is used for cooling the generator and supplying air to the air suspension bearing; detecting the organic working air pressure of the air inlet valve, and if the organic working air pressure of the air inlet valve is within the preset normal working air pressure, opening the air inlet valve and closing the bypass valve; the organic working medium simultaneously enters a left turbine and a right turbine to drive a generator to do work and generate electricity, the exhaust gas after the work is sent into a condenser to be condensed into liquid working medium, and the liquid working medium is pumped into an evaporator through a working medium pump to complete the whole cycle;
step two: detecting the outlet air pressure of a preheating section of the evaporator, if the air pressure is higher than the preset air pressure of the cooling pipeline, opening a solenoid valve of the stabilized pressure pump, and closing a solenoid valve of the bypass stabilized pressure pump; if the air pressure is lower than the air pressure of a preset cooling pipeline of the liquid supply, closing a solenoid valve of the stabilized pump, opening a solenoid valve of the bypass stabilized pump, and keeping the pressure obtained by the air suspension bearing of the air suspension bearing generator stable through the stabilized pump;
step three: when the machine is stopped, the bypass valve is opened from a closed state, and the air inlet valve is closed from an open state; the gaseous organic working medium enters the condenser through the bypass valve; and the evaporator does not exchange heat any more until the external heat source is closed, and the working medium pump is stopped.
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| CN112282871A (en) * | 2020-09-16 | 2021-01-29 | 华电电力科学研究院有限公司 | Symmetrically-arranged high-speed double-turbine distributed excess pressure power generation system |
| CN112360572B (en) * | 2020-10-26 | 2023-03-03 | 北京动力机械研究所 | Closed cycle power generation system with initiative safety function |
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