CN112594018B - Air turbine system for compressed air energy storage power generation system and starting method - Google Patents
Air turbine system for compressed air energy storage power generation system and starting method Download PDFInfo
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- CN112594018B CN112594018B CN202011256450.9A CN202011256450A CN112594018B CN 112594018 B CN112594018 B CN 112594018B CN 202011256450 A CN202011256450 A CN 202011256450A CN 112594018 B CN112594018 B CN 112594018B
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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
- F01K3/00—Plants characterised by the use of steam or heat accumulators, or intermediate steam heaters, therein
- F01K3/14—Plants characterised by the use of steam or heat accumulators, or intermediate steam heaters, therein having both steam accumulator and heater, e.g. superheating accumulator
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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
- F01D17/105—Final actuators by passing part of the fluid
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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
- F01D19/00—Starting of machines or engines; Regulating, controlling, or safety means in connection therewith
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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
- F01K7/22—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 the turbines having inter-stage steam heating
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Abstract
The invention provides an air turbine system for a compressed air energy storage power generation system and a starting method thereof. The method comprises a warm-state starting mode and a cold-state starting mode; the turbine starting mode is that the air turbine high-pressure cylinder is independently started, the low-pressure air inlet valve and the low-pressure regulating valve are fully opened before the unit is flushed, the whole starting process is kept open, the adjustment is not participated, and the operation mode is constant-pressure operation. The starting method mainly meets the performance requirements of quick, efficient and reliable warm-state starting, further ensures the reliability of cold-state starting, and has the short-time phase modulation operation capability of less than 10 min.
Description
The technical field is as follows:
the invention relates to an air turbine system for a compressed air energy storage power generation system and a starting method, and belongs to the technical field of energy storage power generation.
Background art:
in recent years, new energy in China is rapidly developed, but due to the fluctuation of wind and light output, wind and light abandon is increasingly serious. In addition, with the expansion of new energy ratio, the peak-to-valley difference of the power grid is continuously increased, and the power grid regulation capability is seriously insufficient. The advanced energy storage technology is one of the most effective and most economical means for solving the problems of wind and light abandonment and realizing peak clipping and valley filling of the power grid. The non-afterburning compressed air energy storage technology is a large-scale physical energy storage technology with the greatest development prospect at present due to the advantages of large capacity, low manufacturing cost, good economy, energy conservation, environmental protection and the like.
However, in the current non-afterburning compressed air energy storage system, the starting of the air turbine is generally similar to that of a thermal power system or a conventional thermodynamic system, and a starting method cannot be specially designed according to the operation characteristics of the air turbine in the compressed air energy storage system.
In the existing compressed air energy storage system, an air turbine starting method is generally designed according to a starting method of a steam turbine in the traditional thermal power project. However, compared with the traditional thermal power project, the compressed air energy storage system has the obvious characteristic in operation, and the starting of the conventional steam turbine can cause the following problems:
1. the service life problem caused by frequent start and stop of the system is as follows:
the conventional thermodynamic system steam turbine generally operates under a stable working condition, and is stopped only when an accident or maintenance occurs, while the compressed air energy storage system belongs to a thermodynamic system which operates intermittently, and related problems caused by frequent starting and stopping must be considered during design of main equipment of the system. For an air turbine, frequent starting and stopping can cause thermal shock of metal materials of the air turbine, and the problem of fatigue life of the air turbine, particularly under the condition of cold and hot shock of the metal materials of key parts, needs to be considered.
2. The requirement that the quick response of power grid peak regulation is difficult to meet due to the fact that quick start cannot be realized:
in the prior compressed air energy storage system, an air turbine cannot be specially designed according to the requirement of rapid response of power grid peak shaving, and the requirement of rapid response of the power grid is difficult to meet.
The invention content is as follows:
the invention aims to provide an air turbine system and a starting method for a compressed air energy storage power generation system, aiming at the existing problems, so that the warm-state starting time of the energy storage system is shorter than 10 minutes, and the requirement of quick response of power grid peak regulation is met. And the cold-state starting time is less than 60 minutes, and the quick starting of the unit after the overhaul is realized.
The above purpose is realized by the following technical scheme:
an air turbine system for a compressed air energy storage power generation system comprises an air-water heat exchanger connected with a salt cavern, a first oil-gas heat exchanger, a second oil-gas heat exchanger, an air turbine high-pressure cylinder, a third oil-gas heat exchanger, a fourth oil-gas heat exchanger and an air turbine low-pressure cylinder, wherein the first oil-gas heat exchanger and the second oil-gas heat exchanger are connected with the air-water heat exchanger in series; a salt cavern outlet quick closing valve and a setting valve are sequentially arranged on a connecting pipeline between the salt cavern and the gas-water heat exchanger; a high-pressure air inlet valve and a high-pressure regulating valve are sequentially arranged on a connecting pipeline between the second oil-gas heat exchanger and the air turbine high-pressure cylinder; and a low-pressure air inlet valve and a low-pressure regulating valve are sequentially arranged on a connecting pipeline between the fourth oil-gas heat exchanger and the air turbine low-pressure cylinder.
The starting method of the air turbine system for the compressed air energy storage power generation system comprises a warm-state starting mode and a cold-state starting mode;
the condition for executing the warm starting mode is as follows: the system is started and stopped for 1 time every day, the starting interval time of the turbine side is more than 15 hours every time or the system is started and stopped for 1 time every two days, and the starting interval time of the turbine side is more than 40 hours every time;
the method for starting the air turbine high-pressure cylinder in the warm state is characterized in that the air turbine high-pressure cylinder is independently started, the low-pressure air inlet valve and the low-pressure regulating valve are fully opened before the unit is flushed, the low-pressure air inlet valve and the low-pressure regulating valve are kept opened in the whole process of the starting process and do not participate in regulation, the operation mode is constant-pressure operation, and the specific method for independently starting the air turbine high-pressure cylinder comprises the following steps:
11) the machine set is flushed and rotated: slowly opening a setting valve and a high-pressure regulating valve, controlling the air inlet flow of a high-pressure cylinder of an air turbine to be less than 30t/h, maintaining the pressure on a main air pipeline between the setting valve and a high-pressure air inlet valve to be 5-11MPa, and synchronously starting a high-temperature heat-conducting oil pump to supply oil to a first oil-gas heat exchanger; when the rotating speed of the unit is greater than the turning speed, the turning device is automatically disengaged, otherwise, the machine is stopped immediately; the target rotating speed is selected to be 3000r/min, and the speed increasing rate is selected to be 600-800 r/min;
12) carrying out pressure maintaining inspection on the unit and then connecting the unit to the grid: the unit reaches 3000r/min rated speed: the pressure on a main gas pipeline between a setting valve and a high-pressure gas inlet valve is maintained at 5-11MPa, a unit system is checked, and the unit is allowed to be connected to the grid after the check is finished;
13) load lifting: the high-pressure regulating valve is continuously opened, and the heat conduction oil pump continuously increases the supply flow of high-temperature heat conduction oil, so that the system can meet the working condition that the load rate is increased to 30% THA at 10-17 MW/min;
14) switching of an adjusting valve and constant-speed warming: warming up at a 30% THA load point and completing the connection of a setting valve and a turbine high-pressure regulating valve, wherein the setting of the pressure setting valve is adjusted from 5-11MPa to 10-13MPa of rated pressure, the pressure setting valve is gradually opened, and the high-pressure regulating valve is gradually closed to ensure that the load is maintained to be stable at 30% THA;
15) lifting the load to a target value: the load is brought to 30% THA in a grid-connected mode, after warming is sufficient and valve handover is completed, the unit starts to load up to a target value, the opening degree of a high-pressure regulating valve is increased at the moment, the air inflow is increased to meet the load-up requirement, and the load-up rate is selected to be 11-18 MW/min;
the cold starting mode is executed under the condition that the system is started for the first time or is started after the system is shut down, and the cold starting is executed under the condition that the surface temperature of the heat-insulating layer of each oil-gas heat exchanger does not exceed 50 ℃;
the method of the cold starting mode specifically comprises the following steps:
21) preheating a heating pipe: the method comprises the following steps of firstly, fully opening a low-pressure air inlet valve and a low-pressure regulating valve, preheating heat conducting oil of a first oil-gas heat exchanger and a third oil-gas heat exchanger, enabling the temperature of a body to reach 250-300 ℃, simultaneously opening a setting valve and a high-pressure regulating valve to enable the air inlet flow of a turbine high-pressure cylinder to be less than 30t/h, enabling a unit to enter a warm pipe and establishing a heat exchanger temperature field stage, and enabling the high-pressure exhaust temperature not to be lower than 20-30 ℃;
22) the machine set is flushed and rotated: the target rotating speed is 450-550 r/min, and the speed increasing rate is 100-180 r/min; in the heating pipe stage or the flushing stage, when the rotating speed is greater than the turning speed, the turning device is automatically disengaged, otherwise, the turning device is stopped immediately;
23) and (3) grid connection after 500r/min friction inspection:
24) in the load increasing stage, when the pressure before the high-pressure regulating valve reaches 5-11Mpa and the turbine load reaches 20-30%, the setting valve is completely opened, and the high-pressure regulating valve independently regulates the turbine inlet air; slowly opening the high-pressure regulating valve, and increasing the load to 30% THA working condition at the load increasing rate of 1-2 MW/min;
25) switching of an adjusting valve and constant-speed warming: warming up at a 30% THA load point and completing the connection of a salt cavern outlet pressure setting valve and a turbine regulating valve, wherein the setting of the pressure setting valve is adjusted from 5-8 MPa to 0-13MPa of rated pressure, the pressure setting valve is gradually opened, and the turbine preposed high-pressure regulating valve is gradually closed to ensure that the load is maintained to be stable in a 30% THA working condition;
26) lifting the load to a target value: and after the load is brought to 30% by grid connection, the warming is sufficient and the valve handover is completed, the unit starts to increase the load to a target value, the opening of the high-pressure regulating valve is increased at the moment, the air inflow is increased to meet the load increasing requirement, and the load increasing rate is selected to be 3-5 MW/min.
In the starting method of the air turbine system of the compressed air energy storage power generation system, the warm-up time in the step 15) is 1-2 minutes.
In the starting method of the air turbine system of the compressed air energy storage power generation system, the high-pressure regulating valve and the low-pressure regulating valve are closed during the 500r/min friction check in the step 23), the check is carried out at the idle rotating speed, the rotating speed is not allowed to be less than 150-200 r/min in the period, the friction of the movable and static parts is checked, and the retention time is not more than 8 minutes.
In the method for starting the air turbine system of the compressed air energy storage power generation system, in the preheating and warming process in the step 21), if the high-pressure exhaust temperature is lower than 20-30 ℃, the low-pressure regulating valve is adjusted, and the opening degree of the low-pressure regulating valve is reduced so that the high-pressure exhaust temperature is not lower than 20-30 ℃.
In the starting method of the air turbine system of the compressed air energy storage power generation system, the warm-up time in the step 26) is 4-10 min.
Has the advantages that:
1. the invention provides an air turbine starting method for a compressed air energy storage power generation system, and a pressure setting valve is added, so that the adjustability of an air turbine in a low-pressure small-flow air inlet stage is ensured, and the stability of equipment in the starting process is ensured.
2. The invention provides the pressure maintaining requirement after the last system shutdown, can effectively reduce the response time of the heat exchanger starting, improves the inlet temperature of the air turbine and shortens the whole starting time.
3. Aiming at the temperature requirements of the high exhaust temperature of the air turbine on the turbine bearing and the last stage blade, the invention adds the pressure setting valve to complete the pipeline pressure maintaining and small flow switching before starting, cancels the bypass arrangement and the high-pressure cylinder exhaust valve, and simplifies the system structure.
4. In the cold-state starting process, the heat exchanger warm pipe is combined with the air turbine, so that the heat exchanger warm pipe time is shortened, and the overall efficiency of the equipment is improved.
Description of the drawings:
FIG. 1 is a system connection diagram of the present invention.
In the figure: 1. salt holes; 2. a third oil gas heat exchanger; 3. an air turbine high pressure cylinder; 4. a fourth oil gas heat exchanger; 5. a low pressure intake valve; 6. a low pressure regulating valve; 7. an air turbine low pressure cylinder; 8. an outlet muffler; 9. a salt cave outlet quick-closing valve; 10. setting a valve 11 and a gas-water heat exchanger; 12. a first oil-gas heat exchanger; 13. a second oil gas heat exchanger; 14. a high pressure intake valve; 15. a high pressure regulating valve.
The specific implementation mode is as follows:
the present invention will now be described in further detail with reference to the accompanying drawings. These drawings are schematic views each illustrating only the basic structure of the present invention in a schematic manner, and thus show only the constitution related to the present invention.
As shown in fig. 1, the air turbine system for a compressed air energy storage power generation system of the present invention includes a gas-water heat exchanger 11 connected to a salt cavern 1, a first oil-gas heat exchanger 12 and a second oil-gas heat exchanger 13 connected in series to the gas-water heat exchanger 11, an air turbine high pressure cylinder 3 connected to the second oil-gas heat exchanger 13, a third oil-gas heat exchanger 2 and a fourth oil-gas heat exchanger 4 connected in series to the air turbine high pressure cylinder 3, and an air turbine low pressure cylinder 7 connected to the fourth oil-gas heat exchanger 4; a salt cavern outlet quick-closing valve 9 and a setting valve 10 are sequentially arranged on a connecting pipeline between the salt cavern 1 and the gas-water heat exchanger 11; a high-pressure air inlet valve 14 and a high-pressure regulating valve 15 are sequentially arranged on a connecting pipeline between the second oil-gas heat exchanger 13 and the air turbine high-pressure cylinder 3; and a low-pressure air inlet valve 5 and a low-pressure regulating valve 6 are sequentially arranged on a connecting pipeline between the fourth oil-gas heat exchanger 4 and the air turbine low-pressure cylinder 7.
The air passage is sequentially provided with a salt cavern outlet quick closing valve, a setting valve, a gas-water heat exchanger, a first oil-gas heat exchanger, a second oil-gas heat exchanger, a high-pressure air inlet valve, a high-pressure regulating valve, an air turbine high-pressure cylinder, a third oil-gas heat exchanger, a fourth oil-gas heat exchanger, a low-pressure air inlet valve, a low-pressure regulating valve, an air turbine low-pressure cylinder and an outlet silencer.
The starting method of the air turbine system for the compressed air energy storage power generation system comprises a warm-state starting mode and a cold-state starting mode;
the turbine starting mode is that the air turbine high-pressure cylinder is independently started, the low-pressure air inlet valve and the low-pressure regulating valve are fully opened before the unit is flushed, the whole starting process is kept open, the adjustment is not participated, and the operation mode is constant-pressure operation. The starting method mainly meets the performance requirements of quick, efficient and reliable warm-state starting, further ensures the reliability of cold-state starting, and has the short-time phase modulation operation capability of less than 10 min.
The warm start includes two conditions:
1) the system is started and stopped for 1 time every day, and the starting interval time of the turbine side is more than 15 hours every time;
2) the system is started and stopped for 1 time in two days, and the starting interval time of the turbine side is more than 40 hours each time;
the cold start condition is that the system is started for the first time and the equipment is stopped for grade maintenance, and the surface temperature of the heat-insulating layer of the oil-gas heat exchanger does not exceed 50 ℃.
A warm start process:
11) the machine set is flushed and rotated: and the low-pressure air inlet valve and the low-pressure regulating valve are fully opened, and the whole starting process is kept to be opened without participating in regulation. Slowly opening a setting valve and a high-pressure regulating valve, controlling the air inlet flow of an air turbine high-pressure cylinder to be less than 30t/h, maintaining the pressure on a main air pipeline between the pressure setting valve and a high-pressure air inlet valve to be 5-11MPa, starting air inlet of the air turbine high-pressure cylinder, and synchronously starting a high-temperature heat conduction oil pump to supply oil to a first oil-gas heat exchanger; the high-pressure regulating valve is gradually opened, so that the rotating speed of the unit is continuously increased, when the rotating speed is higher than the turning speed, the turning device is automatically disengaged, otherwise, the turning device is stopped immediately; the target rotating speed is 3000r/min, and the speed increasing rate is 600-800 r/min.
2) Reaching 3000r/min rated speed: checking a lubricating system of the unit, a system for adjusting security oil and the like; in order to ensure that the adjusting performance of the valve meets the requirement of stable operation of the unit, the pressure between the setting valve and the high-pressure adjusting valve is maintained at 5-11 MPa.
2) Grid connection: after the turbine generator set is tested or checked, informing operators to allow the set to be connected to the grid; and maintaining the pressure before the high-pressure air inlet valve unchanged in the whole speed increasing and grid-connected load carrying processes.
3) Load lifting: the high-pressure regulating valve is continuously opened to be large, and the heat conduction oil pump continuously increases the supply flow of high-temperature heat conduction oil, so that the load of the system is increased to 30% THA working condition at the load increasing rate of 10-17 MW/min;
4) switching of an adjusting valve and constant-speed warming: the temperature is kept for about 1min at a 30% THA load point, the switching between the setting valve and the high-pressure regulating valve is completed within the time, the setting valve is adjusted from 5-11MPa to 10-13MPa of rated pressure, the setting valve is gradually opened, the high-pressure regulating valve is gradually closed, and the load is maintained to be stable at 30% THA in the process.
5) Lifting the load to a target value: and after the grid-connected load is up to 30%, the warming is sufficient and the valve handover is completed, the unit starts to increase the load to a target value, at the moment, the load is increased mainly by increasing the opening of the high-pressure regulating valve due to the fact that the main gas pressure and the temperature are close to rated parameters, the air inflow is increased to meet the load increasing requirement, and the load increasing rate is selected to be 11-18 MW/min.
Cold start-up procedure:
1) and (3) flushing and rotating a heating pipe and a unit: in order to avoid cold impact on heat exchangers and the like after expansion of the high-pressure cylinder is finished, the first oil-gas heat exchanger and the second oil-gas heat exchanger are preheated by adopting mixed-temperature heat conducting oil, the temperature of the body reaches 250-300 ℃, a setting valve and a high-pressure regulating valve are opened simultaneously, so that the air inlet flow of the turbine high-pressure cylinder is smaller than 30t/h, and a unit enters a warm pipe and a heat exchanger temperature field building stage; at the moment, the high-pressure exhaust temperature is strictly monitored, and is not lower than 20-30 ℃, otherwise, the low-pressure regulating valve is adjusted, and the opening degree of the low-pressure regulating valve is reduced; after the heating pipe is finished, the unit enters a flushing stage, the target rotating speed is selected to be 450-550 r/min, and the speed increasing rate is selected to be 100-180 r/min; in the heating pipe stage or the flushing stage, the high-pressure regulating valve is gradually opened, so that the rotating speed of the unit is continuously increased, when the rotating speed is higher than the turning speed, the turning device is automatically disengaged, and otherwise, the turning device is immediately stopped.
2) 500r/min rub check: the machine set is comprehensively checked at the rotating speed, and the high-pressure regulating valve and the medium-pressure regulating valve are closed during checking and are carried out at the idle rotating speed. In the period, the rotating speed is not allowed to be less than 150-200 r/min, the friction of the movable and static parts is checked, and the retention time is not more than 8 minutes.
3) After the turbine generator set is tested or checked, informing operators to allow the set to be connected to the grid; and maintaining the pressure before the high-pressure main air valve unchanged in the whole speed-raising and grid-connected load-carrying process.
4) And slowly opening the high-pressure regulating valve, and increasing the load to 30% THA working condition at the load increasing rate of 1-2 MW/min.
5) Warming up for about 4-10 min at a load point of 30% THA. And finishing the connection between the setting valve and the high-pressure regulating valve within the period of time, adjusting the setting of the setting valve from 5-8 MPa to rated pressure of 0-13MPa, gradually opening the setting valve, gradually closing the high-pressure regulating valve, and maintaining the load to be stabilized at 30% THA working condition.
6) Lifting the load to a target value: and after the grid-connected load is up to 30%, the warming is sufficient and the valve handover is completed, the unit starts to increase the load to a target value, at the moment, the load is increased mainly by increasing the opening of the regulating valve due to the fact that the main gas pressure and the temperature are close to rated parameters, the air inflow is increased to meet the load increasing requirement, and the load increasing rate is selected to be 3-5 MW/min.
By adopting the method, the temperature-state starting time of the energy storage system is less than 10 minutes, and the requirement of quick response of power grid peak regulation is met. And the cold-state starting time is less than 60 minutes, and the quick starting of the unit after the overhaul is realized.
While particular embodiments of the present invention have been described in the foregoing specification, various modifications and alterations will occur to those skilled in the art without departing from the spirit and scope of the invention.
Claims (5)
1. A starting method of an air turbine system for a compressed air energy storage power generation system is based on the air turbine system for the compressed air energy storage power generation system and comprises an air-water heat exchanger connected with a salt cavern, a first oil-gas heat exchanger, a second oil-gas heat exchanger, an air turbine high-pressure cylinder, a third oil-gas heat exchanger, a fourth oil-gas heat exchanger and an air turbine low-pressure cylinder, wherein the first oil-gas heat exchanger and the second oil-gas heat exchanger are connected with the air-water heat exchanger in series; a salt cavern outlet quick closing valve and a setting valve are sequentially arranged on a connecting pipeline between the salt cavern and the gas-water heat exchanger; a high-pressure air inlet valve and a high-pressure regulating valve are sequentially arranged on a connecting pipeline between the second oil-gas heat exchanger and the air turbine high-pressure cylinder; a low-pressure air inlet valve and a low-pressure regulating valve are sequentially arranged on a connecting pipeline between the fourth oil-gas heat exchanger and the air turbine low-pressure cylinder;
the method is characterized in that: the method comprises a warm-state starting mode and a cold-state starting mode;
the condition for executing the warm starting mode is as follows: the system is started and stopped for 1 time every day, the starting interval time of the turbine side is more than 15 hours every time or the system is started and stopped for 1 time every two days, and the starting interval time of the turbine side is more than 40 hours every time;
the method for starting the air turbine high-pressure cylinder in the warm state is characterized in that the air turbine high-pressure cylinder is independently started, the low-pressure air inlet valve and the low-pressure regulating valve are fully opened before the unit is flushed, the low-pressure air inlet valve and the low-pressure regulating valve are kept opened in the whole process of the starting process and do not participate in regulation, the operation mode is constant-pressure operation, and the specific method for independently starting the air turbine high-pressure cylinder comprises the following steps:
11) the machine set is flushed and rotated: slowly opening a setting valve and a high-pressure regulating valve, controlling the air inlet flow of a high-pressure cylinder of an air turbine to be less than 30t/h, maintaining the pressure on a main air pipeline between the setting valve and a high-pressure air inlet valve to be 5-11MPa, and synchronously starting a high-temperature heat-conducting oil pump to supply oil to a first oil-gas heat exchanger; when the rotating speed of the unit is greater than the turning speed, the turning device is automatically disengaged, otherwise, the machine is stopped immediately; the target rotating speed is selected to be 3000r/min, and the speed increasing rate is selected to be 600-800 r/min;
12) carrying out pressure maintaining inspection on the unit and then connecting the unit to the grid: the unit reaches 3000r/min rated speed: the pressure on a main gas pipeline between a setting valve and a high-pressure gas inlet valve is maintained at 5-11MPa, a unit system is checked, and the unit is allowed to be connected to the grid after the check is finished;
13) load lifting: the high-pressure regulating valve is continuously opened, and the heat conduction oil pump continuously increases the supply flow of high-temperature heat conduction oil, so that the system can meet the working condition that the load rate is increased to 30% THA at 10-17 MW/min;
14) switching of an adjusting valve and constant-speed warming: warming up at a 30% THA load point and completing the connection of a setting valve and a turbine high-pressure regulating valve, wherein the setting of the pressure setting valve is adjusted from 5-11MPa to 10-13MPa of rated pressure, the pressure setting valve is gradually opened, and the high-pressure regulating valve is gradually closed to ensure that the load is maintained to be stable at 30% THA;
15) lifting the load to a target value: the load is brought to 30% THA in a grid-connected mode, after warming is sufficient and valve handover is completed, the unit starts to load up to a target value, the opening degree of a high-pressure regulating valve is increased at the moment, the air inflow is increased to meet the load-up requirement, and the load-up rate is selected to be 11-18 MW/min;
the cold starting mode is executed under the condition that the system is started for the first time or is started after the system is shut down, and the cold starting is executed under the condition that the surface temperature of the heat-insulating layer of each oil-gas heat exchanger does not exceed 50 ℃;
the method of the cold starting mode specifically comprises the following steps:
21) preheating a heating pipe: the method comprises the following steps of firstly, fully opening a low-pressure air inlet valve and a low-pressure regulating valve, preheating heat conducting oil of a first oil-gas heat exchanger and a third oil-gas heat exchanger, opening a setting valve and a high-pressure regulating valve simultaneously when a heat exchanger body reaches 250-300 ℃ to enable the air inlet flow of a turbine high-pressure cylinder to be less than 30t/h, enabling a unit to enter a warm pipe, and establishing a heat exchanger temperature field stage to enable the high-pressure exhaust temperature not to be lower than 20-30 ℃;
22) the machine set is flushed and rotated: the target rotating speed is 450-550 r/min, and the speed increasing rate is 100-180 r/min; in the heating pipe stage or the flushing stage, when the rotating speed is greater than the turning speed, the turning device is automatically disengaged, otherwise, the turning device is stopped immediately;
23) and (3) grid connection after 500r/min friction inspection:
24) in the load increasing stage, when the front pressure of the high-pressure regulating valve reaches 5-11Mpa and the turbine load reaches 20-30%, the setting valve is completely opened, and the high-pressure regulating valve independently regulates the turbine air inlet; slowly opening the high-pressure regulating valve, and increasing the load to 30% THA working condition at the load increasing rate of 1-2 MW/min;
25) switching of an adjusting valve and constant-speed warming: warming up at a 30% THA load point and completing the connection of a salt cavern outlet pressure setting valve and a turbine regulating valve, wherein the setting of the pressure setting valve is adjusted from 5-8 MPa to 0-13MPa of rated pressure, the pressure setting valve is gradually opened, and the turbine preposed high-pressure regulating valve is gradually closed to ensure that the load is maintained to be stable in a 30% THA working condition;
26) lifting the load to a target value: and after the load is brought to 30% by grid connection, the warming is sufficient and the valve handover is completed, the unit starts to increase the load to a target value, the opening of the high-pressure regulating valve is increased at the moment, the air inflow is increased to meet the load increasing requirement, and the load increasing rate is selected to be 3-5 MW/min.
2. The method for starting an air turbine system of a compressed air energy-storing power generation system according to claim 1, wherein: the warm-up time in step 14) is 1-2 minutes.
3. The method for starting an air turbine system of a compressed air energy-storing power generation system according to claim 1, wherein: and (3) closing the high-pressure regulating valve and the low-pressure regulating valve during the friction inspection at 500r/min in the step 23), performing at an idle rotating speed, setting the rotating speed to be 150-200 r/min during the period, and inspecting the friction of the movable and static parts, wherein the retention time is not more than 8 minutes.
4. The method for starting an air turbine system of a compressed air energy-storing power generation system according to claim 1, wherein: in the process of preheating the heating pipe in the step 21), if the high-pressure exhaust temperature is lower than 20-30 ℃, the low-pressure regulating valve is adjusted, and the opening degree of the low-pressure regulating valve is reduced to enable the high-pressure exhaust temperature to be not lower than 20-30 ℃.
5. The method for starting an air turbine system of a compressed air energy-storing power generation system according to claim 1, wherein: the warm-up time in the step 25) is 4-10 min.
Priority Applications (1)
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| CN101025143A (en) * | 2006-02-23 | 2007-08-29 | 邓小刚 | Continous-stable power-supplying wind-driven generating system |
| CN102839995A (en) * | 2011-06-20 | 2012-12-26 | 中国科学院工程热物理研究所 | Isothermal-isobaric compressed air energy storage system |
| CN107489467A (en) * | 2017-08-03 | 2017-12-19 | 中国科学院理化技术研究所 | Compressed air water pumping energy storage system |
| CN108331618A (en) * | 2018-02-05 | 2018-07-27 | 清华大学 | A kind of 10MW compressed-air energy storages method and system |
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| CN101025143A (en) * | 2006-02-23 | 2007-08-29 | 邓小刚 | Continous-stable power-supplying wind-driven generating system |
| CN102839995A (en) * | 2011-06-20 | 2012-12-26 | 中国科学院工程热物理研究所 | Isothermal-isobaric compressed air energy storage system |
| CN107489467A (en) * | 2017-08-03 | 2017-12-19 | 中国科学院理化技术研究所 | Compressed air water pumping energy storage system |
| CN108331618A (en) * | 2018-02-05 | 2018-07-27 | 清华大学 | A kind of 10MW compressed-air energy storages method and system |
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