CN217681877U - Low-pressure cylinder steam inlet superheat degree improving system utilizing fused salt heat storage - Google Patents
Low-pressure cylinder steam inlet superheat degree improving system utilizing fused salt heat storage Download PDFInfo
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- CN217681877U CN217681877U CN202221421425.6U CN202221421425U CN217681877U CN 217681877 U CN217681877 U CN 217681877U CN 202221421425 U CN202221421425 U CN 202221421425U CN 217681877 U CN217681877 U CN 217681877U
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Abstract
The utility model relates to the field of thermal power technology frequency modulation, in particular to a low-pressure cylinder steam inlet superheat degree improving system utilizing fused salt heat storage, which comprises a generator set device and a fused salt heat storage device, wherein the generator set device is connected with the fused salt heat storage device, and the generator set device and the fused salt heat storage device are respectively connected with a power grid; the generator set device comprises a steam turbine and a generator, wherein the steam turbine is used for converting steam heat energy into mechanical energy, and the generator is used for converting the mechanical energy into electric energy and transmitting the electric energy to a power grid; the fused salt heat storage device is used for supplying heat to a steam inlet of a low-pressure cylinder of the steam turbine when a deep peak regulation instruction of a generator sent by a power grid is obtained, so that the superheat degree of steam inlet of the low-pressure cylinder is improved. Utilize the utility model discloses a system can solve the lower technical problem of low jar admission superheat degree in the prior art.
Description
Technical Field
The utility model relates to a thermal power generation technical frequency modulation field especially relates to an utilize low pressure cylinder admission superheat degree improvement system of fused salt heat-retaining.
Background
In recent years, the installed capacity of new energy such as wind power, photovoltaic and hydroelectric power is continuously and rapidly increased in China, the new energy provides a large amount of clean power for people, and simultaneously brings great challenges to the safe operation and power supply guarantee of a power grid, and in addition, china also provides that the proportion of non-fossil energy in primary energy consumption reaches about 25% and the total installed capacity of wind power and solar power generation reaches more than 12 hundred million kilowatts in 2030 years, so that the next step of wind power and solar power generation is greatly improved from the total installed capacity or the generated energy. This necessarily requires that the peak shaving capability of the thermal power generating unit be further enhanced in response to the demand for new power systems to further absorb new energy for power generation.
During the flexible operation mode of the thermal power generating unit, the low superheat degree of the steam inlet of the low-pressure cylinder of the steam turbine is one of the key problems restricting the load depth down regulation of the thermal power generating unit. At present, large thermal generator sets are operated by using sliding parameters, main reheating parameters of a steam turbine are all reduced along with reduction of unit load, and the reduction of the main reheating parameters directly influences steam inlet parameters of a low-pressure cylinder of the steam turbine. When the load of the unit is reduced to a certain degree, the superheat degree of the steam inlet of the low-pressure cylinder of the steam turbine is already low or even close to the saturation temperature, and particularly the steam outlet of the medium-pressure cylinder is a unit with 5-stage steam extraction (such as a heat supply unit and an upper steam ultra-supercritical unit). At the moment, steam enters the wet steam area soon after entering the low-pressure cylinder, and water erosion is generated on the low-pressure cylinder blade, so that the safety of the blade is seriously affected. Therefore, how to improve the superheat degree of the steam entering of the low-pressure cylinder under the deep peak regulation of the thermal power unit is urgent, the flexible operation capacity of the thermal power unit is directly influenced, and the existence of the thermal power unit is concerned.
SUMMERY OF THE UTILITY MODEL
The present invention aims at solving at least one of the technical problems in the related art to a certain extent. Therefore, an object of the present invention is to provide a low-pressure cylinder steam admission superheat degree improving system using molten salt heat storage to solve the technical problem of low-pressure cylinder steam admission superheat degree in the prior art.
In order to achieve the above object, an embodiment of the present invention provides a low pressure cylinder steam admission superheat degree improving system using molten salt heat storage, including a generator set device and a molten salt heat storage device, where the generator set device is connected to the molten salt heat storage device, and the generator set device and the molten salt heat storage device are respectively connected to a power grid;
the generator set device comprises a steam turbine and a generator, wherein the steam turbine is used for converting steam heat energy into mechanical energy, and the generator is used for converting the mechanical energy into electric energy and transmitting the electric energy to the power grid;
the fused salt heat storage device is used for supplying heat to a steam inlet of a low-pressure cylinder of the steam turbine when a generator depth peak regulation instruction sent by the power grid is obtained, so that the steam inlet superheat degree of the low-pressure cylinder is improved.
In one embodiment of the present invention, the molten salt heat storage device includes a molten salt heat spreader, a molten salt heat spreader inlet steam parameter acquisition module, a molten salt heat spreader outlet steam parameter acquisition module, a high temperature molten salt flow calculator, a high temperature molten salt tank, and a high temperature molten salt pump; the molten salt heat radiator inlet steam parameter acquisition module is arranged at an inlet of the molten salt heat radiator and used for acquiring a first steam parameter at the inlet; the fused salt heat emitter outlet steam parameter acquisition module is arranged at the outlet of the fused salt heat emitter and used for acquiring second steam parameters at the outlet; fused salt heat spreader entry steam parameter acquisition module with fused salt heat spreader export steam parameter acquisition module connects respectively high temperature fused salt flow calculator acquires when the power grid sends utilize generator degree of depth peak regulation instruction, high temperature fused salt flow calculator based on first steam parameter with second steam parameter starts the high temperature molten salt pump, the high temperature molten salt jar is used for saving high temperature fused salt, the high temperature molten salt pump is used for driving the high temperature fused salt gets into fused salt heat spreader release heat, the fused salt heat spreader sets up the steam inlet department of low pressure jar.
The utility model discloses an embodiment, fused salt heat-retaining device still includes high temperature fused salt control valve, and high temperature fused salt flow calculator is connected to high temperature fused salt control valve, high temperature fused salt flow calculator still be used for based on first steam parameter and second steam parameter generate flow control instruction, and will flow control instruction send to high temperature fused salt control valve, in order to adjust high temperature fused salt control valve's aperture.
The utility model discloses an embodiment, fused salt heat-retaining device still includes low temperature fused salt jar, low temperature fused salt pump and fused salt heat absorber, the input of low temperature fused salt jar with the output of fused salt heat radiator is connected, the output warp of low temperature fused salt jar low temperature fused salt pump with the fused salt heat absorber is connected to the input of high temperature fused salt pump, the output warp of high temperature fused salt pump with high temperature fused salt control valve is connected to the input of fused salt heat radiator.
The utility model discloses an embodiment, fused salt heat-retaining device still includes the high-temperature steam control valve, the setting of high-temperature steam control valve is in the steam inlet department of fused salt heat absorber for control gets into the heating steam flow of fused salt heat absorber.
The utility model discloses an embodiment, the generating set device still includes the boiler, the steam turbine still includes high-pressure cylinder and intermediate pressure cylinder, the boiler the high-pressure cylinder the intermediate pressure cylinder the low-pressure cylinder with the generator connects gradually.
The utility model discloses an embodiment, the boiler includes main export, inferior export and return steam entry, main export is connected simultaneously the steam inlet of high-pressure cylinder with the steam inlet of fused salt heat absorber, the return steam entry is connected simultaneously the steam outlet of high-pressure cylinder with the steam outlet of fused salt heat absorber, inferior exit linkage the steam inlet of medium-pressure cylinder.
In an embodiment of the present invention, a first steam control valve is disposed on a pipeline connecting the main outlet and the steam inlet of the high pressure cylinder.
In an embodiment of the present invention, a second steam control valve is disposed on a pipeline connecting the secondary outlet of the boiler and the steam inlet of the intermediate pressure cylinder.
In an embodiment of the present invention, a third steam control valve is disposed at the steam inlet of the low pressure cylinder.
In one or more embodiments of the present invention, the power generating unit device is connected to the molten salt heat storage device, and the power generating unit device and the molten salt heat storage device are respectively connected to the power grid; the generator set device comprises a steam turbine and a generator, wherein the steam turbine is used for converting steam heat energy into mechanical energy, and the generator is used for converting the mechanical energy into electric energy and transmitting the electric energy to a power grid; the fused salt heat storage device is used for supplying heat to a steam inlet of a low-pressure cylinder of the steam turbine when a deep peak regulation instruction of a generator sent by a power grid is obtained, so that the superheat degree of steam inlet of the low-pressure cylinder is improved. Under the condition, when the fused salt heat storage device receives a deep peak regulation instruction of the generator sent by a power grid, heat is supplied to the steam inlet of the low-pressure cylinder of the steam turbine, the steam inlet superheat degree of the low-pressure cylinder is improved, and the technical problem that the steam inlet superheat degree of the low-pressure cylinder is lower in the prior art is solved.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a block diagram of a low-pressure cylinder steam inlet superheat degree improving system using molten salt heat storage according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a generator set device according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a molten salt heat storage device according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a low-pressure cylinder steam inlet superheat degree improving system using molten salt heat storage according to an embodiment of the present invention;
fig. 5 is a flowchart of a method for increasing the superheat degree of inlet steam of a low pressure cylinder by using molten salt heat storage according to an embodiment of the present invention;
description of reference numerals:
1-a generator set arrangement; 2-molten salt heat storage device; 3-the power grid; 1-boiler; 1-2-high pressure cylinder of steam turbine; 1-3-turbine intermediate pressure cylinder; 1-4-low pressure cylinder of steam turbine; 1-5-generator; 1-6-a first steam control valve; 1-7-a second steam control valve; 1-8-a third steam control valve; 2-1-low temperature molten salt tank; 2-low temperature molten salt pump; 2-3-molten salt heat absorber; 2-4-high temperature steam control valve; 2-5-high temperature molten salt tank; 2-6-high temperature molten salt pump; 2-7-high temperature molten salt control valve; 2-8-molten salt heat release device; 2-9-a molten salt heat releaser inlet steam parameter acquisition module; 2-10-high temperature molten salt flow calculator; 2-11-fused salt heat releaser outlet steam parameter acquisition module.
Detailed Description
Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The implementations described in the following exemplary embodiments do not represent all implementations consistent with embodiments of the present invention. Rather, they are merely examples of apparatus and methods consistent with certain aspects of embodiments of the present invention.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Moreover, various embodiments or examples and features of various embodiments or examples described in this specification can be combined and combined by one skilled in the art without being mutually inconsistent.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise. It should also be understood that the term "and/or" as used in this disclosure refers to and encompasses any and all possible combinations of one or more of the associated listed items.
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present invention, and should not be construed as limiting the present invention.
The utility model provides an utilize low cylinder admission superheat degree improvement system and method of fused salt heat-retaining, this utilize low cylinder admission superheat degree improvement system and method of fused salt heat-retaining is a system and method that utilize fused salt heat-retaining to improve low cylinder admission superheat degree under the thermal power unit degree of depth peak regulation. The utility model discloses an utilize low pressure cylinder admission superheat degree improvement system and method of fused salt heat-retaining can solve the lower technical problem of low pressure cylinder admission superheat degree in the prior art.
In a first embodiment, fig. 1 is a block diagram of a system for increasing superheat degree of low-pressure cylinder steam intake by using molten salt heat storage according to an embodiment of the present invention. The utility model relates to an utilize low pressure cylinder admission superheat degree improvement system of fused salt heat-retaining can be called superheat degree improvement system for short. As shown in figure 1, the low-pressure cylinder steam inlet superheat degree improving system utilizing molten salt heat storage comprises a generator set device 1 and a molten salt heat storage device 2, the generator set device 1 is connected with the molten salt heat storage device 2, and the generator set device 1 and the molten salt heat storage device 2 are respectively connected with a power grid 3.
In the present embodiment, the power generator unit 1 includes a steam turbine for converting steam heat energy into mechanical energy and a generator for converting mechanical energy into electric energy and delivering the electric energy to the grid 3. The molten salt heat storage device 2 is used for supplying heat to a steam inlet of a low-pressure cylinder of the steam turbine when a generator depth peak regulation instruction sent by the power grid 3 is obtained, so that the steam inlet superheat degree of the low-pressure cylinder is improved.
Fig. 2 is a schematic structural diagram of a generator set device according to an embodiment of the present invention. Fig. 3 is the schematic structural diagram of the molten salt heat storage device provided by the embodiment of the present invention, and fig. 4 is the schematic structural diagram of the low pressure cylinder steam admission superheat degree improving system using the molten salt heat storage provided by the embodiment of the present invention.
Specifically, in some embodiments, as shown in FIG. 2, the genset device 1 includes a boiler 1-1, a high pressure cylinder 1-2, an intermediate pressure cylinder 1-3, a low pressure cylinder 1-4, and a generator 1-5. Wherein, a boiler 1-1, a high pressure cylinder 1-2, a middle pressure cylinder 1-3, a low pressure cylinder 1-4 and a generator 1-5 are connected in sequence.
In some embodiments, boiler 1-1 is used to generate superheated steam for use by a steam turbine. The boiler 1-1 comprises a main outlet, a secondary outlet and a steam return inlet, wherein the main outlet is used for outputting main steam, the main steam is steam generated for the first time, the secondary outlet is used for outputting regenerative steam, the regenerative steam is steam reheated by recovered steam, and the steam return inlet is used for inputting the recovered steam.
In some embodiments, the main outlet, the secondary outlet and the return steam inlet of the boiler 1-1 are connected with the high pressure cylinder 1-2, the intermediate pressure cylinder 1-3 and the molten salt heat absorber 2-3 through corresponding pipelines. Specifically, the main outlet is connected with a steam inlet of the high pressure cylinder 1-2, the steam return inlet is connected with a steam outlet of the high pressure cylinder 1-2, and the secondary outlet is connected with a steam inlet of the intermediate pressure cylinder 1-3 (see fig. 2 or fig. 4). The main outlet is also connected with a steam inlet of a molten salt heat absorber 2-3 in the molten salt heat storage device 2, and the steam return inlet is also connected with a steam outlet of the molten salt heat absorber 2-3 (see fig. 4). In this case, the boiler 1-1 recovers steam from the high pressure cylinder 1-2 and the molten salt heat absorber 2-3 through the return steam inlet, and then re-heats the steam and supplies the steam to the intermediate pressure cylinder 1-3, thereby improving the heat utilization rate of the steam.
In some embodiments, a steam turbine is used to convert the thermal energy of the superheated steam (i.e., steam heat energy) from the boiler 1-1 into mechanical energy, maintaining high speed rotation, to drive the generator 1-5 to generate electricity. The steam turbine comprises a high pressure cylinder 1-2, a middle pressure cylinder 1-3 and a low pressure cylinder 1-4. The high pressure cylinder 1-2, the intermediate pressure cylinder 1-3 and the low pressure cylinder 1-4 are coaxially arranged. Wherein the high pressure cylinder 1-2 can also be called as a turbine high pressure cylinder, the intermediate pressure cylinder 1-3 can also be called as a turbine intermediate pressure cylinder, and the low pressure cylinder 1-4 can also be called as a turbine low pressure cylinder.
In some embodiments, as shown in FIG. 2, the steam outlet of the intermediate pressure cylinder 1-3 is connected to the steam inlet of the low pressure cylinder 1-4 by a pipeline.
In some embodiments, as shown in FIG. 2, a first steam control valve 1-6 is provided on a pipe connecting the main outlet of the boiler 1-1 and the steam inlet of the high pressure cylinder 1-2, and the first steam control valve 1-6 is used to control the flow of steam into the high pressure cylinder 1-2.
In some embodiments, as shown in FIG. 2, a second steam control valve 1-7 is provided on a pipe connecting the secondary outlet of the boiler 1-1 and the steam inlet of the intermediate pressure cylinder 1-3, and the second steam control valve 1-7 is used to control the flow of steam into the intermediate pressure cylinder 1-3.
In some embodiments, as shown in FIG. 2, a third steam control valve 1-8 is provided at the steam inlet of the low pressure cylinder 1-4, and the third steam control valve 1-8 is used to control the flow of steam into the low pressure cylinder 1-4.
In some embodiments, the generators 1-5 are used to convert mechanical energy into electrical energy driven by a turbine and deliver the electrical energy to the grid 3.
The specific operation process of the generator set device 1 comprises: main steam output from a main outlet of a boiler 1-1 enters a high-pressure turbine cylinder 1-2 to do work, and simultaneously enters a molten salt heat absorber 2-3 to release heat, after two streams of steam (namely the steam exhausted from the high-pressure turbine cylinder 1-2 and the steam exhausted from the molten salt heat absorber 2-3) reach the steam exhaust parameters of the high-pressure turbine cylinder 1-2, the two streams of steam enter the boiler 1-1 through a steam return inlet of the boiler 1-1 to perform heat regeneration, the heat regenerated steam at an outlet of the boiler 1-1 times enters a medium-pressure turbine cylinder 1-3 to do work, and then enters a low-pressure turbine cylinder 1-4 to do work, and the high-pressure turbine cylinder 1-2, the medium-pressure turbine cylinder 1-3 and the low-pressure turbine cylinder 1-4 are coaxially arranged to drive a generator 1-5 to generate electricity and then are connected with a power grid 3.
Specifically, in some embodiments, as shown in fig. 3, the molten salt heat storage device 2 includes a low-temperature molten salt tank 2-1, a low-temperature molten salt pump 2-2, a molten salt heat absorber 2-3, a high-temperature steam control valve 2-4, a high-temperature molten salt tank 2-5, a high-temperature molten salt pump 2-6, a high-temperature molten salt control valve 2-7, a molten salt heat spreader 2-8, a molten salt heat spreader inlet steam parameter acquisition module 2-9, a high-temperature molten salt flow calculator 2-10, and a molten salt heat spreader outlet steam parameter acquisition module 2-11. The input end of the low-temperature molten salt tank 2-1 is connected with the output end of the molten salt heat radiator 2-8, the output end of the low-temperature molten salt tank 2-1 is connected to the input end of the high-temperature molten salt pump 2-6 through the low-temperature molten salt pump 2-2 and the molten salt heat absorber 2-3, and the output end of the high-temperature molten salt pump 2-6 is connected to the input end of the molten salt heat radiator 2-8 through the high-temperature molten salt pump 2-6 and the high-temperature molten salt control valve 2-7. The high-temperature molten salt control valve 2-7 is connected with the high-temperature molten salt flow calculator 2-10, and the molten salt heat radiator inlet steam parameter acquisition module 2-9 and the molten salt heat radiator outlet steam parameter acquisition module 2-11 are respectively connected with the high-temperature molten salt flow calculator 2-10. As shown in fig. 4, the molten salt heat emitter 2-8 is provided at the steam inlet of the low pressure cylinder 1-4. Namely, the fused salt heat radiator 2-8 is arranged on the pipelines of the steam outlet of the intermediate pressure cylinder 1-3 and the steam inlet of the low pressure cylinder 1-4.
In some embodiments, the low temperature molten salt tank 2-1 is used to store low temperature molten salt. The low-temperature molten salt pump 2-2 is used for driving low-temperature molten salt in the low-temperature molten salt tank 2-1 to enter the molten salt heat absorber 2-3 to absorb heat.
In some embodiments, the molten salt heat absorber 2-3 is used to absorb heat energy from the superheated steam from the boiler 1-1, heat the low temperature molten salt to a high temperature molten salt, and then send to the high temperature molten salt tank 2-5.
In some embodiments, a high temperature steam control valve 2-4 is provided at the steam inlet of the molten salt heat absorber 2-3 for controlling the flow of heating steam into the molten salt heat absorber 2-3.
In some embodiments, the high temperature molten salt tank 2-5 is used to store high temperature molten salt.
In some embodiments, the high temperature molten salt pump 2-6 is used to drive the high temperature molten salt in the high temperature molten salt tank 2-5 into the molten salt heat emitter 2-8 to release heat.
In some embodiments, the high temperature molten salt control valve 2-7 is used to vary the opening based on a flow control command to regulate the flow of high temperature molten salt in the high temperature molten salt tank 2-5 into the molten salt heat spreader 2-8.
In some embodiments, the molten salt heat releaser 2-8 is configured to release heat by using high-temperature molten salt from the high-temperature molten salt tank 2-5 when the molten salt heat storage device 2 obtains a generator depth peak shaving instruction sent by the power grid 3, and the released heat is steam at a steam inlet of the low-pressure cylinder 1-4 to heat the steam so as to improve the steam inlet superheat degree of the low-pressure cylinder. In addition, the high-temperature molten salt becomes low-temperature molten salt after releasing heat, and the molten salt heat releaser 2-8 also conveys the low-temperature molten salt back to the low-temperature molten salt tank 2-1.
In some embodiments, the molten salt heat spreader inlet steam parameter acquisition module 2-9 is disposed at an inlet of the molten salt heat spreader 2-8, and the molten salt heat spreader outlet steam parameter acquisition module 2-11 is disposed at an outlet of the molten salt heat spreader 2-8, specifically, if a pipeline connecting a steam outlet of the intermediate pressure cylinder 1-3 and a steam inlet of the low pressure cylinder 1-4 is defined as a target pipeline, a position on a pipeline connecting a steam outlet of the intermediate pressure cylinder 1-3 and a steam inlet of the low pressure cylinder 1-4 where the molten salt heat spreader 2-8 is located is defined as a target position, the molten salt heat spreader inlet steam parameter acquisition module 2-9 is disposed at a front end of the target position of the target pipeline (i.e., near a steam outlet side of the intermediate pressure cylinder 1-3), and the molten salt heat spreader outlet steam parameter acquisition module 2-11 is disposed at a rear end of the target position of the target pipeline (i.e., near a steam inlet side of the low pressure cylinder 1-4).
In some embodiments, the molten salt heat spreader inlet steam parameter acquisition module 2-9 is to acquire a first steam parameter at the molten salt heat spreader inlet (i.e., the front end of the target location of the target pipeline). The molten salt heat spreader inlet steam parameter acquisition modules 2-9 may include, for example, a temperature sensor T and a pressure sensor P, and the first steam parameters include inlet steam temperature and steam pressure. And the fused salt heat emitter outlet steam parameter acquisition modules 2-11 are used for acquiring second steam parameters at the outlet of the fused salt heat emitter (namely the rear end of the target position of the target pipeline). The molten salt heat spreader outlet steam parameter acquisition modules 2-11 may include, for example, a temperature sensor T and a pressure sensor P, and the second steam parameters include outlet steam temperature and steam pressure. Wherein the first steam parameter is equal to the second steam parameter when the molten salt heat spreader 2-8 is not emitting heat (i.e., not activated). After the molten salt heat releaser 2-8 releases heat, the steam temperature in the second steam parameter becomes larger. The steam temperature in the second steam parameter is increased to show that the steam superheat degree (namely the steam inlet superheat degree or the steam inlet superheat degree) of the steam inlets of the low pressure cylinders 1-4 is improved.
In some embodiments, upon obtaining a deep peak shaving instruction by the generator 1-5 issued by the power grid 3, the high temperature molten salt flow calculator 2-10 starts the high temperature molten salt pump 2-6 based on the first steam parameter and the second steam parameter. When the fused salt heat releaser 2-8 is not started, the first steam parameter is equal to the second steam parameter, so that when a deep peak regulation instruction sent by the power grid 3 and utilizing the generator 1-5 is obtained, the high-temperature fused salt flow calculator 2-10 can also start the high-temperature fused salt pump 2-6 based on the first steam parameter or the second steam parameter.
In some embodiments, the high temperature molten salt flow calculator 2-10 is further configured to generate a flow control instruction based on the first steam parameter and the second steam parameter, and send the flow control instruction to the high temperature molten salt control valve 2-7 to adjust the opening of the high temperature molten salt control valve 2-7.
Specifically, the high-temperature molten salt flow calculator 2-10 generates a flow control instruction based on the steam superheat degree at the inlet of the molten salt heat releaser and the steam superheat degree at the outlet of the molten salt heat releaser, wherein the steam superheat degree at the inlet of the molten salt heat releaser can be obtained by utilizing the steam pressure and the steam temperature detected by the steam parameter acquisition module 2-9 at the inlet of the molten salt heat releaser and then calling a steam property function for calculation. And the superheat degree of the steam at the outlet of the molten salt heat releaser is obtained by utilizing the steam pressure and the steam temperature detected by the outlet steam parameter acquisition module 2-11 of the molten salt heat releaser and then calling a water vapor property function for calculation.
In some embodiments, the specific steps of the superheat degree increasing system for the low-pressure cylinder steam inlet superheat degree by using the molten salt heat storage include the following:
when the power grid 3 requires the generator 1-5 to operate according to the intermediate load, the heat load of the boiler 1-1 can be slightly higher than the required load of the power grid 3, and the excess part supplies heat to the molten salt heat absorber 2-3 through the high-temperature steam control valve 2-4 in a main steam mode; meanwhile, the low-temperature molten salt pump 2-2 is started to drive low-temperature molten salt to enter the molten salt heat absorber 2-3 to absorb heat, the liquid level of the low-temperature molten salt tank 2-1 is gradually reduced, the liquid level of the high-temperature molten salt tank 2-5 is gradually increased in the process, and the heat absorption process is finished;
when a power grid 3 sends out a command that a generator 1-5 needs to carry out deep peak shaving to a lower load (namely, the generator deep peak shaving command is utilized), a fused salt heat releaser inlet steam parameter acquisition module 2-9 transmits steam parameters to a high-temperature fused salt flow calculator 2-10, the high-temperature fused salt flow calculator 2-10 calls a water vapor property function to determine and judge the steam superheat degree, if the steam superheat degree is lower than the safety requirement value of the steam superheat degree of a turbine low pressure cylinder 1-4, a high-temperature fused salt pump 2-6 is started, and high-temperature fused salt is driven to enter a fused salt heat releaser 2-8 to release heat, so that the steam superheat degree of the turbine low pressure cylinder 1-4 is improved, and the safety of the turbine low pressure cylinder 1-4 blades under deep shaving is ensured; and then outputting a flow control instruction through a high-temperature molten salt flow calculator 2-10 to guide a high-temperature molten salt control valve 2-7 to accurately control the flow of the high-temperature molten salt, so that the stability of the superheat degree of the steam entering the low-pressure cylinder 1-4 of the steam turbine is ensured, the liquid level of the high-temperature molten salt tank 2-5 is gradually reduced in the process, the liquid level of the low-temperature molten salt tank 2-1 is gradually increased, and the heat release process is completed.
In the low-pressure cylinder steam inlet superheat degree improving system utilizing the fused salt heat storage, the generator set device is connected with the fused salt heat storage device, and the generator set device and the fused salt heat storage device are respectively connected with the power grid; the generator set device comprises a steam turbine and a generator, wherein the steam turbine is used for converting steam heat energy into mechanical energy, and the generator is used for converting the mechanical energy into electric energy and transmitting the electric energy to a power grid; the fused salt heat storage device is used for supplying heat to a steam inlet of a low-pressure cylinder of the steam turbine when a deep peak regulation instruction of a generator sent by a power grid is obtained, so that the superheat degree of steam inlet of the low-pressure cylinder is improved. Under the condition, when the fused salt heat storage device receives a deep peak regulation instruction of the generator sent by a power grid, heat is supplied to the steam inlet of the low-pressure cylinder of the steam turbine, the steam inlet superheat degree of the low-pressure cylinder is improved, and the technical problem that the steam inlet superheat degree of the low-pressure cylinder is lower in the prior art is solved. In addition, the safety requirement value of the superheat degree of the steam inlet steam is comprehensively considered, the steam parameter acquisition module at the inlet of the fused salt heat releaser, the high-temperature fused salt flow calculator, the high-temperature fused salt pump, the fused salt heat releaser and the high-temperature fused salt control valve in the fused salt heat storage device cooperate to complete heat release, the superheat degree of the steam inlet steam of the low-pressure cylinder of the steam turbine is improved, and meanwhile, the safety of the low-pressure cylinder blade of the steam turbine under deep adjustment and the stability of the superheat degree of the steam inlet steam of the low-pressure cylinder of the steam turbine are guaranteed.
The following is a method embodiment of the present invention, and please refer to a system embodiment of the present invention for details not disclosed in the method embodiment of the present invention. The embodiment of the utility model provides a method for improving the superheat degree of inlet steam of a low-pressure cylinder by utilizing heat storage of molten salt. The method for improving the superheat degree of the steam entering the low-pressure cylinder by utilizing the heat storage of the molten salt adopts the system embodiment for improving the superheat degree of the steam entering the low-pressure cylinder by utilizing the heat storage of the molten salt.
Fig. 5 is a flowchart of a method for increasing the superheat degree of the inlet steam of the low pressure cylinder by using the heat stored by the molten salt according to the embodiment of the present invention. As shown in fig. 5, the method for improving the superheat degree of the intake steam of the low-pressure cylinder by using the molten salt for heat storage comprises the following steps:
s101, converting steam heat energy into mechanical energy by using a steam turbine;
s102, converting mechanical energy into electric energy by using a generator, and transmitting the electric energy to a power grid;
s103, obtaining an instruction sent by a power grid for carrying out deep peak shaving by using a generator, and supplying heat to a steam inlet of a low-pressure cylinder of the steam turbine based on the instruction molten salt heat storage device so as to improve the steam inlet superheat degree of the low-pressure cylinder.
Optionally, in step S103, obtaining a command sent by the power grid to perform deep peak regulation by using a generator, and supplying heat to a steam inlet of a low-pressure cylinder of the steam turbine based on the command molten salt heat storage device, includes: when a generator depth peak regulation instruction sent by a power grid is obtained, collecting a first steam parameter at an inlet of a molten salt heat radiator and a second steam parameter at an outlet of the molten salt heat radiator; and starting a high-temperature molten salt pump based on the first steam parameter and the second steam parameter, and driving high-temperature molten salt to enter the molten salt heat releaser by using the high-temperature molten salt pump to release heat.
Reference may be made to the description related to the above system embodiment, which is not repeated herein.
It should be noted that the foregoing explanation of the embodiment of the low-pressure cylinder steam admission superheat degree improving system for storing heat by using molten salt is also applicable to the low-pressure cylinder steam admission superheat degree improving method for storing heat by using molten salt in the embodiment, and is not described herein again.
The above embodiment numbers of the present invention are only for description, and do not represent the advantages and disadvantages of the embodiments.
In the method for improving the superheat degree of the inlet steam of the low-pressure cylinder by utilizing the heat storage of the molten salt, the steam heat energy is converted into mechanical energy by utilizing a steam turbine, the mechanical energy is converted into electric energy by utilizing a generator, and the electric energy is transmitted to a power grid; and when a power grid sends a deep peak regulation instruction by using the generator, heat is supplied to a steam inlet of a low-pressure cylinder of the steam turbine so as to improve the superheat degree of the steam inlet of the low-pressure cylinder. Under the condition, when the fused salt heat storage device receives a deep peak regulation instruction of the generator sent by a power grid, heat is supplied to the steam inlet of the low-pressure cylinder of the steam turbine, the steam inlet superheat degree of the low-pressure cylinder is improved, and the technical problem that the steam inlet superheat degree of the low-pressure cylinder is lower in the prior art is solved. In addition, the safety requirement value of the superheat degree of the steam inlet steam is comprehensively considered, the steam parameter acquisition module at the inlet of the fused salt heat releaser, the high-temperature fused salt flow calculator, the high-temperature fused salt pump, the fused salt heat releaser and the high-temperature fused salt control valve in the fused salt heat storage device cooperate to complete heat release, the superheat degree of the steam inlet steam of the low-pressure cylinder of the steam turbine is improved, and meanwhile, the safety of the low-pressure cylinder blade of the steam turbine under deep adjustment and the stability of the superheat degree of the steam inlet steam of the low-pressure cylinder of the steam turbine are guaranteed.
It should be understood that various forms of the flows shown above may be used, with steps reordered, added, or deleted. For example, the steps described in the present invention may be executed in parallel or sequentially or in different orders, as long as the desired result of the technical solution disclosed in the present invention can be achieved, and the present invention is not limited herein.
The above detailed description does not limit the scope of the present invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions may be made in accordance with design requirements and other factors. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A low-pressure cylinder steam inlet superheat degree improving system utilizing molten salt heat storage is characterized by comprising: the system comprises a generator set device and a molten salt heat storage device, wherein the generator set device is connected with the molten salt heat storage device, and the generator set device and the molten salt heat storage device are respectively connected with a power grid;
the generator set device comprises a steam turbine and a generator, wherein the steam turbine is used for converting steam heat energy into mechanical energy, and the generator is used for converting the mechanical energy into electric energy and transmitting the electric energy to the power grid;
the fused salt heat storage device is used for supplying heat to a steam inlet of a low-pressure cylinder of the steam turbine when a generator depth peak regulation instruction sent by the power grid is obtained, so that the steam inlet superheat degree of the low-pressure cylinder is improved.
2. The low-pressure cylinder steam inlet superheat degree improving system utilizing molten salt heat storage according to claim 1, wherein the molten salt heat storage device comprises a molten salt heat releaser, a molten salt heat releaser inlet steam parameter acquisition module, a molten salt heat releaser outlet steam parameter acquisition module, a high-temperature molten salt flow calculator, a high-temperature molten salt tank and a high-temperature molten salt pump;
the inlet steam parameter acquisition module of the molten salt heat releaser is arranged at the inlet of the molten salt heat releaser and is used for acquiring a first steam parameter at the inlet; the fused salt heat emitter outlet steam parameter acquisition module is arranged at the outlet of the fused salt heat emitter and used for acquiring second steam parameters at the outlet;
fused salt heat spreader entry steam parameter acquisition module with fused salt heat spreader export steam parameter acquisition module connects respectively high temperature fused salt flow calculator acquires when the power grid sends utilize generator degree of depth peak regulation instruction, high temperature fused salt flow calculator based on first steam parameter with second steam parameter starts the high temperature molten salt pump, the high temperature molten salt jar is used for saving high temperature fused salt, the high temperature molten salt pump is used for driving the high temperature fused salt gets into fused salt heat spreader release heat, the fused salt heat spreader sets up the steam inlet department of low pressure jar.
3. The low-pressure cylinder steam inlet superheat degree improving system utilizing molten salt heat storage of claim 2, wherein the molten salt heat storage device further comprises a high-temperature molten salt control valve, the high-temperature molten salt control valve is connected with a high-temperature molten salt flow calculator, and the high-temperature molten salt flow calculator is further configured to generate a flow control instruction based on the first steam parameter and the second steam parameter, and send the flow control instruction to the high-temperature molten salt control valve so as to adjust an opening degree of the high-temperature molten salt control valve.
4. The low-pressure cylinder steam inlet superheat degree improving system utilizing molten salt heat storage according to claim 3, wherein the molten salt heat storage device further comprises a low-temperature molten salt tank, a low-temperature molten salt pump and a molten salt heat absorber, an input end of the low-temperature molten salt tank is connected with an output end of the molten salt heat emitter, an output end of the low-temperature molten salt tank is connected to an input end of the high-temperature molten salt pump through the low-temperature molten salt pump and the molten salt heat absorber, and an output end of the high-temperature molten salt pump is connected to an input end of the molten salt heat emitter through the high-temperature molten salt pump and the high-temperature molten salt control valve.
5. The low-pressure cylinder steam admission superheat degree improving system utilizing molten salt heat storage according to claim 4, wherein the molten salt heat storage device further comprises a high-temperature steam control valve, and the high-temperature steam control valve is arranged at a steam admission port of the molten salt heat absorber and used for controlling the flow of heating steam entering the molten salt heat absorber.
6. The system of claim 5, wherein the power generation unit further comprises a boiler, the steam turbine further comprises a high pressure cylinder and an intermediate pressure cylinder, and the boiler, the high pressure cylinder, the intermediate pressure cylinder, the low pressure cylinder and the generator are connected in sequence.
7. The low-pressure cylinder steam inlet superheat degree improving system utilizing molten salt heat storage according to claim 6, wherein the boiler comprises a main outlet, a secondary outlet and a steam return inlet, the main outlet is simultaneously connected with a steam inlet of the high-pressure cylinder and a steam inlet of the molten salt heat absorber, the steam return inlet is simultaneously connected with a steam outlet of the high-pressure cylinder and a steam outlet of the molten salt heat absorber, and the secondary outlet is connected with a steam inlet of the intermediate-pressure cylinder.
8. The low-pressure cylinder steam inlet superheat degree improving system utilizing molten salt heat storage according to claim 7, wherein a first steam control valve is arranged on a pipeline connecting the main outlet and the steam inlet of the high-pressure cylinder.
9. The low-pressure cylinder steam admission superheat degree improving system utilizing molten salt heat storage according to claim 7,
and a second steam control valve is arranged on a pipeline connecting the secondary outlet of the boiler and the steam inlet of the intermediate pressure cylinder.
10. The low-pressure cylinder steam admission superheat degree improving system utilizing molten salt heat storage according to claim 7,
and a third steam control valve is arranged at the steam inlet of the low pressure cylinder.
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