阅读说明：本技术 一种快速响应的蓄热储能发电系统及方法 (Quick-response heat storage and energy storage power generation system and method ) 是由 张通 梅生伟 王国华 张学林 薛小代 林迎虎 张凯 陈俊彦 吴锐 于 2020-11-11 设计创作，主要内容包括：本发明提供一种快速响应的蓄热储能发电系统及方法,其以导热油作为蓄热工质,该系统包括储能侧单元、发电侧单元、氮封单元、氮气排放单元和导热油再生单元；储能侧换热器采用余热等作为热源将导热油加热后进行储存；发电侧单元采用储存的导热油将工质加热以用于发电；氮封单元用于对导热油的保护及系统定压；氮气排放单元用于当罐内压力升高时维持系统的运行压力；导热油再生单元用于对导热油进行在线再生。本发明适用于中温蓄热的导热油储能发电系统,可以达到氮封系统安全、环保排放的目的,可在线实现导热油的再生与回收,实现导热油储能系统的稳定安全运行。发电时可实现储能系统启动时间小于10分钟,满足电网调峰快速响应的需求。(The invention provides a quick-response heat storage and energy storage power generation system and a quick-response heat storage and energy storage power generation method, wherein heat conduction oil is used as a heat storage working medium, and the system comprises an energy storage side unit, a power generation side unit, a nitrogen sealing unit, a nitrogen gas discharge unit and a heat conduction oil regeneration unit; the heat exchanger at the energy storage side adopts waste heat and the like as heat sources to heat the heat conduction oil and then stores the heat conduction oil; the power generation side unit adopts the stored heat conduction oil to heat the working medium for power generation; the nitrogen sealing unit is used for protecting heat conduction oil and keeping the system constant pressure; the nitrogen discharge unit is used for maintaining the operating pressure of the system when the pressure in the tank rises; the heat conduction oil regeneration unit is used for carrying out online regeneration on heat conduction oil. The invention is suitable for a heat conduction oil energy storage power generation system with medium-temperature heat storage, can achieve the aim of safe and environment-friendly discharge of a nitrogen sealing system, can realize the regeneration and recovery of heat conduction oil on line, and realizes the stable and safe operation of the heat conduction oil energy storage system. The starting time of the energy storage system can be shortened to be less than 10 minutes during power generation, and the requirement of fast response of power grid peak shaving is met.)

1. A quick-response heat storage and energy storage power generation system is characterized in that heat conduction oil is used as a heat storage medium, and the system comprises an energy storage side unit, a power generation side unit, a nitrogen sealing unit, a nitrogen gas discharge unit and a heat conduction oil regeneration unit;

the energy storage side unit comprises a cold oil tank and a cold oil pump connected with the cold oil tank, the cold oil pump outputs two pipelines, one pipeline is connected with a heat conduction oil buffer tank through a first stop valve, the other pipeline is connected with an energy storage side heat exchanger through a second stop valve, and the energy storage side heat exchanger adopts industrial waste heat, solar energy or compressed air as a heat exchange medium;

the power generation side unit comprises a hot oil tank connected with the energy storage side heat exchanger and a hot oil pump connected with the hot oil tank, the hot oil pump outputs two pipelines, one pipeline is connected with a heat conduction oil regeneration tank through a third stop valve, the other pipeline is connected with the heat conduction oil buffer tank through a fourth stop valve, and the heat conduction oil buffer tank is connected with the power generation side heat exchanger;

the nitrogen sealing unit comprises a nitrogen sealing opening pipe, the nitrogen sealing opening pipe is connected with the cold oil tank, the cold oil tank is connected with the hot oil tank through a nitrogen sealing communicating pipe, a nitrogen sealing pipe stop valve is arranged on the nitrogen sealing communicating pipe, and the nitrogen sealing communicating pipe is connected with the nitrogen gas discharge unit through a nitrogen sealing discharge valve;

the nitrogen discharging unit comprises a nitrogen cooler connected with the nitrogen seal discharging valve, the nitrogen cooler is connected with an emptying water distribution tank, the top of the emptying water distribution tank is connected with a nitrogen discharging pipeline through an activated carbon adsorption tank, and the bottom of the emptying water distribution tank is connected with a water discharging valve;

the heat conduction oil regeneration unit comprises a heat conduction oil regeneration tank connected with the hot oil pump through a third stop valve, the upper part of the heat conduction oil regeneration tank is connected with a light component storage tank through a light component condenser, and the light component storage tank is connected with the cold oil tank through a regeneration system oil pump.

2. The rapid response thermal storage energy storage and generation system according to claim 1, wherein the cold oil tank is provided with a cold oil tank safety valve connected to the nitrogen gas discharge unit, and the hot oil tank is provided with a hot oil tank safety valve connected to the nitrogen gas discharge unit.

3. The rapid response thermal storage energy storage and power generation system according to claim 1, wherein electric tracing is arranged on the pipeline from the hot oil tank to the conduction oil buffer tank.

4. A method for storing energy and generating power by using the quick-response heat storage and energy storage power generation system is characterized by comprising the following steps:

when the system operates, the nitrogen sealing unit is started to work, then the energy storage working condition is operated, the energy storage side heat exchanger in the energy storage side unit absorbs solar energy, industrial waste heat and heat of compressed air or is heated by valley electricity and abandoned wind and abandoned photoelectricity, heat conduction oil flows out of the cold oil tank, is pressurized by the cold oil pump and then enters the energy storage side heat exchanger through the second stop valve to be heated, and enters the hot oil tank after reaching a high temperature state, and when the energy storage working condition works, cold oil with the volume of 5-10% of that of the oil tank needs to be stored in the cold oil tank for use when the power generation working condition is started; after the energy storage working condition is finished, the system enters a static working condition, and at the moment, all heat absorbed by the system from an external heat source is stored in heat conduction oil in the hot oil tank; when the system needs to generate electricity, in the energy storage side unit, the cold oil pump is started, the first stop valve is started, the second stop valve is closed, and the heat conduction oil flows out of the cold oil tank, is pressurized by the cold oil pump and then enters the heat conduction oil buffer tank through the first stop valve; in the power generation side unit, a hot oil pump is started, a third stop valve is closed, a fourth stop valve is opened, and heat conduction oil flows out of a hot oil tank, is pressurized by the hot oil pump and then enters a heat conduction oil buffer tank through the fourth stop valve; at the moment, through adjusting the opening of the first stop valve and the fourth stop, the flow of cold heat conduction oil and heat conduction oil entering the heat conduction oil buffer tank can be controlled, and then the outlet temperature of the heat conduction oil buffer tank is adjusted, the outlet temperature of the heat conduction oil buffer tank is adjusted according to the shell temperature of the heat exchanger at the power generation side, after the power generation working condition is finished, the system enters a working condition to be stored, the heat conduction oil in the system is stored in the cold oil tank at the moment, the next starting of the energy storage working condition is waited, in the process of operating the energy storage working condition and the power generation working condition, the nitrogen emission working condition and the heat conduction oil regeneration working condition.

5. The quick response thermal storage, energy storage and power generation method according to claim 4, wherein the nitrogen emission working process is as follows: when the power generation working condition is operated, heat conduction oil flows into the cold oil tank from the hot oil tank, nitrogen flows into the hot oil tank from the cold oil tank along with the heat conduction oil to cause pressure rise, the system can discharge part of the nitrogen through the nitrogen discharge unit to maintain the pressure stability of the system, and when the pressure in the tank exceeds the nitrogen seal pressure, the nitrogen in the cold oil tank/the hot oil tank is discharged through the nitrogen seal discharge valve; when the pressure in the cold oil tank/hot oil tank suddenly rises to exceed 1.1 times of the working pressure due to an accident, the nitrogen is also discharged through a safety valve of the cold oil tank and a safety valve of the hot oil tank;

when the nitrogen discharging working condition is operated, the nitrogen cooler is started, the nitrogen is cooled to the ambient temperature firstly, then enters the emptying water diversion tank, the discharged nitrogen is separated into a gas phase substance and a liquid phase substance in the emptying water diversion tank, the liquid phase substance is discharged through the water drainage valve, the gas phase substance is a mixture of the nitrogen and the heat conduction oil light component, the gas phase substance firstly enters the activated carbon adsorption tank to adsorb the heat conduction oil light component, and the rest nitrogen is discharged into the atmosphere.

6. The quick-response heat storage, energy storage and power generation method according to claim 4, wherein when the heat conduction oil regeneration working condition is running, the hot oil pump is started, the third stop valve is started, the heat conduction oil flows out of the hot oil tank, is pressurized by the hot oil pump, then enters the regeneration system through the third stop valve, the flow entering the heat conduction oil regeneration unit is regulated by the third stop valve, after entering the regeneration device, the heat conduction oil distills out light components and middle effective components by controlling certain pressure and temperature, enters the light component condenser, enters the light component storage tank after being condensed, then is conveyed to the cold oil tank through the regeneration system heat conduction oil pump, and the residual heavy components and residual heat conduction oil in the heat conduction oil regeneration device enter the heavy component storage tank to be intensively subjected to environmental protection treatment.

The technical field is as follows:

the invention relates to a quick-response heat storage and energy storage power generation system and method, which adopt heat conduction oil as a heat storage working medium and belong to the technical field of energy storage.

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, a large amount of middle-low grade waste heat energy exists in industrial production in China, and the waste heat is not fully utilized. 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 heat storage and energy storage power generation technology is one of the most effective and economical means for solving the problems of wind and light abandonment, realizing waste heat recycling and relieving the peak-valley difference of a power grid.

According to the temperature division of heat storage, the heat storage technology can be divided into three categories: the high-temperature heat storage at the temperature of above 400 ℃ generally adopts solid heat storage materials such as quartz stone, concrete and the like, and the medium-temperature heat storage at the temperature of 200 ℃ and 400 ℃ generally adopts fused salt and heat conducting oil as heat storage materials; water is generally used as a heat storage material for low-temperature heat storage at 200 ℃ or lower. For medium-temperature heat storage, the use temperature of the binary salt in the molten salt is generally 260-550 ℃, and the binary salt needs to be combined with other working media for heat storage. In addition, the molten salt system is complex, heat tracing needs to be arranged to prevent solidification, and energy consumption is additionally increased. Therefore, medium-temperature heat storage is generally performed by using heat transfer oil.

At present, various types of heat conduction oil energy storage systems exist in the market, but various problems exist. Utility model patents (CN 210740716U) and (CN 209541174U) propose two kinds of heat conduction oil energy storage systems, but these two kinds of heat conduction oil systems all have following three defects and are not enough:

1. the design of the nitrogen sealing system has defects

In the heat conduction oil energy storage system, nitrogen sealing is needed to ensure safe and stable operation of heat conduction oil. When the system operates under different working conditions, the nitrogen sealing system of the cold and hot oil tank needs to supplement or discharge nitrogen. The relief valve will initiate venting of nitrogen when the system pressure exceeds the relief pressure. The light components of the heat transfer oil can be mixed with nitrogen and exist in a gas phase state because the light components can be generated by decomposition in the operation process of the heat transfer oil. In the nitrogen sealing system in these two utility model, with the equal direct emission of nitrogen gas to the atmosphere, can make exhaust nitrogen gas high temperature like this, can take out the light component polluted environment of conduction oil simultaneously, can't satisfy the requirement of safety ring guarantor.

2. Unconfigured regeneration system

In the process of energy storage of the heat conduction oil, light components and heavy components are always generated, and when a certain decomposition rate is reached, regeneration and recovery treatment are needed. If not processed, the light components can increase the pressure of the system, which affects the operation safety of the system, and the heavy components can be accumulated in valves, pipelines and equipment, which affects the operation of the equipment. Therefore, the heat conduction oil energy storage system needs to be provided with an online regeneration and recovery system, and the safe and stable operation of the system is ensured.

3. The requirement of quick response of power grid peak regulation cannot be met due to the fact that quick start cannot be realized

In the current heat-conducting oil energy storage system, equipment and a heat exchanger on the power generation side cannot be specially designed according to the requirement of quick response of power grid peak regulation. According to the current system design, during starting, a pipeline, an oil pump and a heat exchanger need to be heated, the temperature of the pipeline rises to about 2-5 ℃/min, the starting time is more than 1 hour, and the requirement of quick response of a power grid is difficult to meet.

The invention content is as follows:

the invention aims to provide a quick-response heat storage energy storage power generation system and a quick-response heat storage energy storage power generation method aiming at the existing problems, which are suitable for a heat conduction oil energy storage power generation system with medium-temperature heat storage, prevent the discharge temperature of nitrogen from being overhigh, prevent the light components of heat conduction oil in the nitrogen from being discharged along with the nitrogen, achieve the aim of safe and environment-friendly discharge of the nitrogen, realize the regeneration and recovery of the heat conduction oil on line and realize the stable and safe operation of the heat conduction oil energy storage system; the starting time of the energy storage system is shorter than 10 minutes, and the requirement of rapid response of power grid peak shaving is met.

The above purpose is realized by the following technical scheme:

a quick-response heat storage and energy storage power generation system comprises an energy storage side unit, a power generation side unit, a nitrogen sealing unit, a nitrogen gas discharge unit and a heat conduction oil regeneration unit;

the energy storage side unit comprises a cold oil tank and a cold oil pump connected with the cold oil tank, the cold oil pump outputs two pipelines, one pipeline is connected with a heat conduction oil buffer tank through a first stop valve, the other pipeline is connected with an energy storage side heat exchanger through a second stop valve, and the energy storage side heat exchanger adopts heat supply waste heat as a heat exchange medium;

the power generation side unit comprises a hot oil tank connected with the energy storage side heat exchanger and a hot oil pump connected with the hot oil tank, the hot oil pump outputs two pipelines, one pipeline is connected with a heat conduction oil regeneration tank through a third stop valve, the other pipeline is connected with the heat conduction oil buffer tank through a fourth stop valve, and the heat conduction oil buffer tank is connected with the power generation side heat exchanger;

the nitrogen sealing unit comprises a nitrogen sealing opening pipe, the nitrogen sealing opening pipe is connected with the cold oil tank, the cold oil tank is connected with the hot oil tank through a nitrogen sealing communicating pipe, a nitrogen sealing pipe stop valve is arranged on the nitrogen sealing communicating pipe, and the nitrogen sealing communicating pipe is connected with the nitrogen gas discharge unit through a nitrogen sealing discharge valve;

the nitrogen discharging unit comprises a nitrogen cooler connected with the nitrogen seal discharging valve, the nitrogen cooler is connected with an emptying water distribution tank, the top of the emptying water distribution tank is connected with a nitrogen discharging pipeline through an activated carbon adsorption tank, and the bottom of the emptying water distribution tank is connected with a water discharging valve;

the heat conduction oil regeneration unit comprises a heat conduction oil regeneration tank connected with the hot oil pump through a third stop valve, the upper part of the heat conduction oil regeneration tank is connected with a light component storage tank through a light component condenser, and the light component storage tank is connected with the cold oil tank through a regeneration system oil pump.

The quick-response heat storage and energy storage power generation system is characterized in that a cold oil tank safety valve is arranged on the cold oil tank and connected with the nitrogen gas discharge unit, and a hot oil tank safety valve is arranged on the hot oil tank and connected with the nitrogen gas discharge unit.

In the quick-response heat accumulation and energy storage power generation system, electric tracing is uniformly distributed on a pipeline between the hot oil tank and the heat conduction oil buffer tank.

The method for storing energy and generating power by using the quick-response heat storage and energy storage power generation system comprises the following steps:

when the system operates, the nitrogen sealing unit is started to work, then the energy storage working condition is operated, the energy storage side heat exchanger in the energy storage side unit absorbs solar energy, industrial waste heat and heat of compressed air or is heated by valley electricity and abandoned wind and abandoned photoelectricity, heat conduction oil flows out of the cold oil tank, is pressurized by the cold oil pump and then enters the energy storage side heat exchanger through the second stop valve to be heated, and enters the hot oil tank after reaching a high temperature state, and when the energy storage working condition works, cold oil with the volume of 5-10% of that of the oil tank needs to be stored in the cold oil tank for use when the power generation working condition is started; after the energy storage working condition is finished, the system enters a static working condition, and at the moment, all heat absorbed by the system from an external heat source is stored in heat conduction oil in the hot oil tank; when the system needs to generate electricity, in the energy storage side unit, the cold oil pump is started, the first stop valve is started, the second stop valve is closed, and the heat conduction oil flows out of the cold oil tank, is pressurized by the cold oil pump and then enters the heat conduction oil buffer tank through the first stop valve; in the power generation side unit, a hot oil pump is started, a third stop valve is closed, a fourth stop valve is opened, and heat conduction oil flows out of a hot oil tank, is pressurized by the hot oil pump and then enters a heat conduction oil buffer tank through the fourth stop valve; at the moment, through adjusting the opening of the first stop valve and the fourth stop, the flow of cold heat conduction oil and heat conduction oil entering the heat conduction oil buffer tank can be controlled, and then the outlet temperature of the heat conduction oil buffer tank is adjusted, the outlet temperature of the heat conduction oil buffer tank is adjusted according to the shell temperature of the heat exchanger at the power generation side, after the power generation working condition is finished, the system enters a working condition to be stored, the heat conduction oil in the system is stored in the cold oil tank at the moment, the next starting of the energy storage working condition is waited, in the process of operating the energy storage working condition and the power generation working condition, the nitrogen emission working condition and the heat conduction oil regeneration working condition.

The quick-response heat storage energy storage power generation method comprises the following working conditions of nitrogen emission: when the power generation working condition is operated, heat conduction oil flows into the cold oil tank from the hot oil tank, nitrogen flows into the hot oil tank from the cold oil tank along with the heat conduction oil to cause pressure rise, the system can discharge part of the nitrogen through the nitrogen discharge unit to maintain the pressure stability of the system, and when the pressure in the tank exceeds the nitrogen seal pressure, the nitrogen in the cold oil tank/the hot oil tank is discharged through the nitrogen seal discharge valve; when the pressure in the cold oil tank/hot oil tank suddenly rises to exceed 1.1 times of the working pressure due to an accident, nitrogen is also discharged through a cold oil tank safety valve and a hot oil tank safety valve. When the nitrogen discharging working condition is operated, the nitrogen cooler is started, the nitrogen is cooled to the ambient temperature firstly, then enters the emptying water diversion tank, the discharged nitrogen is separated into a gas phase substance and a liquid phase substance in the emptying water diversion tank, the liquid phase substance is discharged through the water drainage valve, the gas phase substance is a mixture of the nitrogen and the heat conduction oil light component, the gas phase substance firstly enters the activated carbon adsorption tank to adsorb the heat conduction oil light component, and the rest nitrogen is discharged into the atmosphere.

According to the quick-response heat storage energy storage power generation method, when the heat conduction oil regeneration working condition is operated, the hot oil pump is started, the third stop valve is started, the heat conduction oil flows out of the hot oil tank, is pressurized by the hot oil pump and then enters the regeneration system through the third stop valve, the flow entering the heat conduction oil regeneration unit is regulated by the third stop valve, after entering the regeneration device, the heat conduction oil distills out light components and middle effective components by controlling certain pressure and temperature, enters the light component condenser, enters the light component storage tank after condensation, and then is conveyed to the cold oil tank through the heat conduction oil pump of the regeneration system, and the residual heavy components and residual heat conduction oil values in the heat conduction oil regeneration device enter the heavy component storage tank to be intensively subjected to environment protection treatment.

Has the advantages that:

1. the invention provides a heat-conducting oil energy storage power generation system suitable for medium-temperature heat storage and a quick starting method thereof, which can recover industrial waste heat, solar energy, compressed air, abandoned wind, abandoned light and energy of off-peak electricity, and can drive a steam turbine or a turbine to do work for power generation by heating water vapor, high-pressure air, organic working media and the like during power generation so as to meet the requirements of a power grid during power consumption peak.

2. The invention provides a design method of a nitrogen discharge system in a heat conduction oil nitrogen sealing system, which can solve the problems of overhigh nitrogen discharge temperature, environmental pollution and the like.

3. The invention provides a design method of a heat conduction oil regeneration system, which can realize the separation of light components and heavy components of heat conduction oil on line, wherein the light components are recovered after being condensed, and the heavy components are intensively subjected to environment-friendly treatment after being stored, so that the stable and safe operation of the heat conduction oil energy storage system is realized.

4. The invention provides a system design and a starting method capable of realizing quick starting of a heat conduction oil energy storage power generation system, and the system can realize that the starting time of the energy storage system is less than 10 minutes and meet the requirement of quick response of power grid peak regulation.

Description of the drawings:

FIG. 1 is a system connection diagram of the present invention.

In the figure: 1. a cold oil tank; 2. a hot oil tank; 3. a cold oil pump; 4. a first shut-off valve; 5. a second stop valve; 6. an energy storage side heat exchanger; 7. a hot oil pump; 8. a third stop valve; 9. a fourth stop valve; 10. a heat conducting oil buffer tank; 11. a power generation side heat exchanger; 12. a nitrogen-sealed inlet conduit; 13. a nitrogen seal communicating pipe; 14. a cold oil tank relief valve; 15. a nitrogen seal communicating pipe stop valve; 16. a hot oil tank relief valve; 17. a nitrogen seal air release valve; 18. a nitrogen gas cooler; 19. an activated carbon adsorption tank; 20. emptying the water distribution tank; 21. a water drain valve; 22. a light component condenser; 23. a heat transfer oil regeneration device; 24. a light component storage tank; 25. a heavy ends storage tank; 26. a regeneration system oil pump.

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.

The invention relates to a quick-response heat storage and energy storage power generation system and a quick-response heat storage and energy storage power generation method, which take heat conduction oil as a heat storage medium, and mainly comprise an energy storage side unit, a power generation side unit, a nitrogen sealing unit, a nitrogen discharging unit and a heat conduction oil regeneration unit as shown in figure 1.

The energy storage side unit mainly comprises a cold oil tank 1, a cold oil pump 3, a first stop valve 4, a second stop valve 5, an energy storage side heat exchanger 6, a cold oil tank safety valve 14 and a connecting pipeline. There are two pipeline branches behind the cold oil pump 3, and a pipeline branch is passed through first stop valve 4 and is linked to each other with conduction oil buffer tank 10, and another pipeline branch passes through second stop valve 5 and links to each other with energy storage side heat exchanger 6. A cold oil tank safety valve 14 is arranged on the cold oil tank 1.

The power generation side unit mainly comprises a hot oil tank 2, a hot oil pump 7, a third stop valve 8, a fourth stop valve 9, a heat conduction oil buffer tank 10, a power generation side heat exchanger 11, a hot oil tank safety valve 16 and a connecting pipeline. Electric tracing is arranged on pipelines between the hot oil tank 2, the hot oil pump 7, the hot oil tank 2 and the conduction oil buffer tank 10, as shown by dotted lines in figure 1. A hot oil tank safety valve 16 is arranged on the hot oil tank 2. There are two pipeline branches behind the hot oil pump 7, and a pipeline branch road passes through third stop valve 8 and links to each other with the conduction oil regeneration unit, and buffer tank 10 links to each other, and another pipeline branch road passes through fourth stop valve 9 and links to each other with conduction oil buffer tank 10. An inlet of the heat conduction oil buffer tank 10 is connected with the cold oil pump 3 and the hot oil pump 7 through the first stop valve 4 and the fourth stop valve 9 respectively, and an outlet of the heat conduction oil buffer tank is connected with the power generation side heat exchanger 11.

The nitrogen sealing unit consists of a nitrogen sealing opening pipe 12, a nitrogen sealing communicating pipe 13, a nitrogen sealing communicating pipe stop valve 15 and a nitrogen sealing discharge valve 17. The nitrogen-sealed opening pipe 12 is connected with the cold oil tank 1, the tops of the cold oil tank 1 and the hot oil tank 2 are communicated through a nitrogen-sealed communicating pipe 13, a stop valve 15 is arranged on the nitrogen-sealed communicating pipe 13, and the nitrogen-sealed communicating pipe is connected with a nitrogen gas discharge unit through a nitrogen-sealed discharge valve 17.

The nitrogen gas discharge unit consists of a nitrogen gas cooler 18, an active carbon adsorption tank 19, an emptying water diversion tank 20 and a water drain valve 21. The nitrogen gas discharge unit is connected with the nitrogen sealing unit through a nitrogen sealing discharge valve 17, connected with the cold oil tank 1 through a cold oil tank safety valve 14 and connected with the hot oil tank through a hot oil tank safety valve 16.

The heat conducting oil regeneration unit mainly comprises a heat conducting oil regeneration device 23, a light component condenser 22, a light component storage tank 24, a heavy component storage tank 25, a heat conducting oil regeneration unit oil pump 26 and the like. The heat conducting oil regeneration unit is connected with the hot oil pump 1 through a third stop valve 8, and is connected with the cold oil tank 1 through a heat conducting oil regeneration unit oil pump 26.

When the system operates, the nitrogen sealing unit is firstly operated. The operation working conditions of the system are mainly divided into an energy storage working condition, a static working condition, a power generation working condition and a working condition to be stored, and the nitrogen emission working condition, the heat conduction oil regeneration working condition and the like operate according to the actual operation conditions of the system. These are discussed separately below:

a nitrogen sealing unit: in order to realize the protection of heat conduction oil and the constant pressure of the system, the heat conduction oil system is provided with a nitrogen sealing unit. The nitrogen source of the nitrogen sealing unit is a self-prepared nitrogen making machine in a plant area, before the system runs, nitrogen enters the cold oil tank 1 from the nitrogen sealing inlet pipeline 12 and maintains a certain pressure, at the moment, the stop valve 15 on the nitrogen sealing communicating pipe 13 is opened, and the same pressure is maintained in the cold oil tank 1 and the hot oil tank 2. The pressure is determined according to the working pressure of the adopted heat conducting oil, and is generally 0.2-0.4 MPa higher than the working pressure. Because the heat conduction oil can change along with the temperature generated by the operation of the system, the heat conduction oil shrinks or expands to cause pressure fluctuation in the tank, and the pressure in the storage tank can be adjusted through the nitrogen seal air inlet pipeline 12 and the nitrogen seal exhaust valve 17, so that the constant pressure of the heat conduction oil system is stabilized. When the pressure in the tank rises, the nitrogen seal exhaust valve 17 is opened, and the nitrogen in the tank is discharged to a nitrogen cooling system; when the pressure in the tank is reduced, the nitrogen-sealed air inlet pipeline 12 is opened to supplement air and maintain the operating pressure of the system. When the machine is stopped for maintenance, the stop valve 15 on the nitrogen-sealed communicating pipe is closed, and the cold oil tank 1 and the hot oil tank 2 are separately maintained.

Energy storage working condition: when the energy storage working condition is operated, the cold oil pump 3 is opened, the first stop valve 4 is closed, the second stop valve 5 is opened, the heat conduction oil flows out of the cold oil tank 1, is pressurized by the cold oil pump 3 and then enters the energy storage side heat exchanger 6 through the second stop valve 5, absorbs the heat of solar energy, industrial waste heat and compressed air or is heated by valley electricity and abandoned wind and abandoned photoelectricity, and enters the hot oil tank 2 after reaching a high temperature state. When the energy storage working condition is finished, a certain amount of cold oil is stored in the cold oil tank 1 and is used when the power generation working condition is started.

And (3) under a static working condition: and after the energy storage working condition is finished, the system enters a static working condition. At this time, the heat absorbed from the external heat source by the system is entirely stored in the thermal oil tank 2.

The power generation working condition is as follows: when the power consumption of the power grid is large, the power generation working condition starts to respond to the power grid demand. Because the electric tracing heat is uniformly distributed on the pipelines between the hot oil tank 2, the hot oil pump 7, the hot oil tank 2 and the heat conduction oil buffer tank 10, the temperature drop of the pipeline at the section is small after the pipeline is circularly operated from the last time, the heating pipe is not needed, and the starting time of the system can be greatly shortened. When the power generation working condition is operated, in the energy storage side unit, the cold oil pump 3 is opened, the first stop valve 4 is opened, the second stop valve 5 is closed, and the heat conduction oil flows out of the cold oil tank 1, is pressurized by the cold oil pump 3 and then enters the heat conduction oil buffer tank 10 through the first stop valve 4. In the power generation side unit, a hot oil pump 7 is opened, a third stop valve 8 is closed, a fourth stop valve 9 is opened, and heat conduction oil flows out of a hot oil tank 2, is pressurized by the hot oil pump 7 and then enters a heat conduction oil buffer tank 10 through the fourth stop valve 9. At this time, by adjusting the opening degrees of the first stop valve 4 and the fourth stop valve 9, the flow rate of the cold heat transfer oil and the heat transfer oil entering the heat transfer oil buffer tank can be controlled, and the outlet temperature of the heat transfer oil buffer tank 10 can be adjusted. In order to prevent the power generation side heat exchanger 11 from being dry-burned and the temperature difference from being too large, the outlet temperature of the heat conducting oil buffer tank 10 is adjusted according to the shell temperature of the power generation side heat exchanger 11 and gradually rises, so that the power generation side heat exchanger can be prevented from generating too large thermal stress, and the service life of the heat exchanger is prolonged. The power generation working medium can be water vapor, high-pressure compressed air or an organic working medium, and enters a turbine to do work after being heated by the power generation side heat exchanger 11, so that the generator is driven to generate power, and the requirement of a power grid is met. The design of the electric tracing and heat conducting oil buffer tank 10 in the power generation side unit can effectively reduce the starting time of the power generation working condition.

The working condition to be stored is as follows: after the power generation working condition is finished, the system enters a working condition to be stored, and the heat conduction oil in the system is stored in the cold oil tank 1 at the moment to wait for the next starting of the energy storage working condition.

Nitrogen emission working condition: when the pressure in the heat conducting oil storage tank is overhigh, the system can discharge partial nitrogen through the nitrogen discharge unit so as to maintain the pressure stability of the system. The nitrogen in the tank is normally vented through a nitrogen seal vent valve 17, and when the pressure in the tank suddenly rises, the nitrogen is also vented through a cold tank relief valve 14 and a hot tank relief valve 16. When the nitrogen discharge condition is running, the nitrogen cooler 18 is started, the nitrogen is cooled to the ambient temperature firstly, and then enters the emptying water division tank 20. In the blowdown water separation tank 20, the discharged nitrogen is separated into a gas phase substance and a liquid phase substance, the liquid phase substance is generally water, and is discharged through a water discharge valve 21. The gas phase substance is a mixture of nitrogen and heat conducting oil light components, and the mixture is directly discharged into the atmosphere to cause environmental pollution, so that the gas phase substance firstly enters the activated carbon adsorption tank 19 to adsorb the heat conducting oil light components, and the residual nitrogen is discharged into the atmosphere to achieve the purpose of environmental protection.

The regeneration working condition of the heat conducting oil is as follows: after the heat transfer oil system operates for a period of time, the safety and stability of the system operation can be affected due to the generation of light components and heavy components in the heat transfer oil. At this time, the heat transfer oil can be regenerated on line. The heat conducting oil regeneration working condition can be operated simultaneously with the heat storage working condition and the power generation working condition. When the heat conduction oil is in the regeneration working condition, the hot oil pump 7 is started, the third stop valve 8 is started, the heat conduction oil flows out of the hot oil tank 2, is pressurized by the hot oil pump 7 and then enters the regeneration system through the third stop valve 8, and the flow entering the heat conduction oil regeneration unit is regulated by the third stop valve 8. After the heat conduction oil enters the regeneration device 23, light components and intermediate effective components are distilled out by controlling certain pressure and temperature, enter the light component condenser 22, enter the light component storage tank 24 after being condensed, and then are conveyed to the cold oil tank through the regeneration system heat conduction oil pump 26. And the residual heavy components and the residual heat conducting oil in the regeneration device 23 enter a heavy component storage tank 25, and are subjected to centralized environmental protection treatment.

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.