CN216554042U - Heat storage coupling thermal power unit system based on molten salt heat storage - Google Patents
Heat storage coupling thermal power unit system based on molten salt heat storage Download PDFInfo
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Abstract
The utility model belongs to the technical field of thermal power generation, and discloses a heat storage coupling thermal power generating unit system based on molten salt heat storage, which comprises a thermal power generating unit, a heating power subsystem and a heat storage system; the heat storage system comprises a heat exchange subsystem, a molten salt heat storage subsystem and a heat release subsystem; a steam inlet of the heat exchange subsystem is connected with a main steam outlet and a reheat steam outlet of the boiler; a steam outlet of the heat exchange subsystem is connected with a reheater inlet of the boiler and a steam inlet of the deaerator; the molten salt heat storage subsystem is connected with the heat exchange subsystem and the heat release subsystem, and a working medium inlet and a working medium outlet of the heat release subsystem are respectively connected with a water supply outlet of the multistage high-pressure heater and the boiler. The system is coupled with the thermal power generating unit by configuring the molten salt system, so that decoupling of the boiler and the steam turbine is realized, and the peak load regulation range and the operation flexibility are improved.
Description
Technical Field
The utility model belongs to the technical field of thermal power generation, and relates to a heat storage coupling thermal power unit system based on molten salt heat storage.
Background
At present, in order to reduce carbon dioxide emission and achieve peak value and carbon neutralization as early as possible, the industrial structure and the energy structure need to be optimized first, and the construction of a novel power system with a new energy as a subject is an important means for achieving the double-carbon target. With the access of a large amount of renewable energy sources represented by solar energy and wind energy to a power grid in the future, the existing coal-fired thermal power generating unit plays a new role in a novel power system in the future, on one hand, the load operation is reduced as far as possible under the condition of sufficient renewable energy sources, and a capacity channel is made for the renewable energy sources; on the other hand, when the renewable energy is insufficient, the load can be quickly increased, the power and electric quantity supply is ensured, the operation flexibility of the existing coal-fired thermal power generating unit is required to be improved, and the deep regulation capability is realized.
However, the flexibility of the existing thermal power generating unit is poor, the actual peak regulation capacity of the pure condensation thermal power generating unit is generally about 50% of the rated capacity, the peak regulation capacity of the heat supply unit in the heat supply period is only about 20% of the rated capacity, and the requirement of a novel power system on the flexibility in the future cannot be met, so that the flexibility improvement of the existing thermal power generating unit is bound to be needed. At present, most of schemes are to modify a boiler body to meet the requirement of deep peak regulation, but the boiler is deviated from a design point for a long time to operate, so that the efficiency is low, the coal consumption is increased, and the requirement of carbon peak reaching is not facilitated. Therefore, how to improve the efficiency of the unit deep-adjusting stage is a problem to be solved urgently at present.
SUMMERY OF THE UTILITY MODEL
The utility model aims to overcome the defects of the prior art and provides a heat storage coupling thermal power unit system based on molten salt heat storage.
In order to achieve the purpose, the utility model adopts the following technical scheme to realize the purpose:
a heat storage coupling thermal power unit system based on molten salt heat storage comprises a thermal power unit, a heating power subsystem and a heat storage system; the thermal power unit comprises a boiler, a turbine high-pressure cylinder, a turbine medium/low-pressure cylinder and a generator, and the thermal power subsystem comprises a condenser, a multistage low-pressure heater, a deaerator and a multistage high-pressure heater which are sequentially connected in series according to the flow direction of a working medium; the heat storage system comprises a heat exchange subsystem, a molten salt heat storage subsystem and a heat release subsystem; a main steam outlet of the boiler is connected with a steam inlet of a high-pressure cylinder of the steam turbine, a steam outlet of the high-pressure cylinder of the steam turbine is connected with an inlet of a reheater of the boiler, an outlet of the reheater of the boiler is connected with a steam inlet of a medium/low-pressure cylinder of the steam turbine, and the high-pressure cylinder of the steam turbine and the medium/low-pressure cylinder of the steam turbine are both connected with a generator; the steam exhaust port of the turbine medium/low pressure cylinder is connected with the inlet of a condenser, and the feed water outlet of the multistage high-pressure heater is connected with the inlet of a preheater of a boiler; a steam inlet of the heat exchange subsystem is connected with a main steam outlet and a reheat steam outlet of the boiler; a steam outlet of the heat exchange subsystem is connected with a reheater inlet of the boiler and a steam inlet of the deaerator; the low-temperature molten salt outlet and the low-temperature molten salt inlet of the molten salt heat storage subsystem are respectively connected with the low-temperature molten salt inlet of the heat exchange subsystem and the low-temperature molten salt outlet of the heat release subsystem; the high-temperature molten salt outlet and the high-temperature molten salt inlet of the molten salt heat storage subsystem are respectively connected with the high-temperature molten salt inlet of the heat release subsystem and the high-temperature molten salt outlet of the heat exchange subsystem; and a working medium inlet and a working medium outlet of the heat release subsystem are respectively connected with a water supply outlet of the multistage high-pressure heater and the boiler.
Optionally, the heat exchange subsystem comprises a plurality of main steam-molten salt heat exchangers and a plurality of reheat steam-molten salt heat exchangers; a steam inlet of the main steam-molten salt heat exchanger is connected with a main steam outlet of the boiler, and a steam outlet of the main steam-molten salt heat exchanger is connected with an inlet of a reheater of the boiler; the steam inlet of the reheat steam-molten salt heat exchanger is connected with the reheat steam outlet of the boiler; the steam outlet of the reheat steam-molten salt heat exchanger is connected with the steam inlet of the deaerator; the low-temperature molten salt inlets of the main steam-molten salt heat exchanger and the reheat steam-molten salt heat exchanger are connected with the low-temperature molten salt outlet of the molten salt heat storage subsystem, and the high-temperature molten salt outlets of the main steam-molten salt heat exchanger and the reheat steam-molten salt heat exchanger are connected with the high-temperature molten salt inlet of the molten salt heat storage subsystem.
Optionally, the molten salt heat storage subsystem comprises a high-temperature molten salt storage tank, a low-temperature molten salt storage tank, a high-temperature molten salt pump and a low-temperature molten salt pump; a molten salt inlet of the high-temperature molten salt storage tank is connected with a high-temperature molten salt outlet of the heat exchange subsystem, and the molten salt outlet of the high-temperature molten salt storage tank is connected with a high-temperature molten salt inlet of the heat release subsystem through a high-temperature molten salt pump; the fused salt entry of low temperature fused salt storage tank and the low temperature fused salt exit linkage of heat release subsystem, the fused salt export of low temperature fused salt storage tank passes through the low temperature fused salt entry linkage of low temperature fused salt pump and heat transfer subsystem.
Optionally, the heat-releasing subsystem comprises a molten salt-feed water heat exchanger and a molten salt-steam heat exchanger; a feed water inlet of the molten salt-feed water heat exchanger is connected with a feed water outlet of the multi-stage high-pressure heater, and a feed water outlet of the molten salt-feed water heat exchanger is connected with an inlet of a preheater of the boiler; a steam inlet of the fused salt-steam heat exchanger is connected with a steam outlet of a high-pressure cylinder of the steam turbine, and a steam outlet of the fused salt-steam heat exchanger is connected with a reheater steam inlet of the boiler; the high-temperature molten salt inlet of the molten salt-steam heat exchanger is connected with the high-temperature molten salt outlet of the molten salt heat storage subsystem, the medium-temperature molten salt outlet of the molten salt-steam heat exchanger is connected with the low-temperature molten salt inlet of the molten salt-water supply heat exchanger, and the medium-temperature molten salt outlet of the molten salt-water supply heat exchanger is connected with the low-temperature molten salt inlet of the molten salt heat storage subsystem.
Optionally, the heat-releasing subsystem is a steam generator; the working medium inlet of the steam generator is connected with the feed water outlet of the multi-stage high-pressure heater, and the working medium outlet of the steam generator is connected with the superheater header of the boiler.
Optionally, the multistage low-pressure heater comprises a plurality of low-pressure feed water heaters which are sequentially connected in series according to the flow direction of the working medium, and according to the flow direction of the working medium, a feed water inlet of the first stage low-pressure feed water heater is connected with a feed water outlet of the condenser; the water supply outlet of the last stage of low-pressure water supply heater is connected with the water supply inlet of the deaerator, and the steam inlets of the low-pressure water supply heaters are connected with the steam exhaust port of the steam turbine medium/low pressure cylinder.
Optionally, the multistage high-pressure heater comprises a plurality of high-pressure feed water heaters which are sequentially connected in series according to the flow direction of the working medium, and according to the flow direction of the working medium, a feed water inlet of the first-stage high-pressure feed water heater is connected with a feed water outlet of the deaerator; the water supply outlet of the last stage high-pressure water supply heater is connected with the inlet of a preheater of the boiler and the working medium inlet of the heat release subsystem, and the steam inlets of the high-pressure heaters of all stages are connected with the steam exhaust port of the high-pressure cylinder of the steam turbine.
Optionally, flow meters are arranged on pipelines between the condenser and the multistage low-pressure heater and pipelines between the deaerator and the multistage high-pressure heater.
Optionally, regulating valves are arranged on the pipeline between the boiler and the heat exchange subsystem and the pipeline between the multi-stage high-pressure heater and the heat release subsystem.
Compared with the prior art, the utility model has the following beneficial effects:
according to the heat storage coupling thermal power generating unit system based on the molten salt heat storage, when the thermal power generating unit participates in power grid peak shaving and needs to reduce output, partial main steam and reheated steam are led out from the unit and enter the heat storage system, heat is stored in the molten salt heat storage subsystem in a high-temperature molten salt mode, and partial heat is stored in the heat storage system while the output of the unit is reduced; when the unit participates in power grid peak shaving and needs to increase output, part of feed water or steam is led out from the thermal power unit and enters the heat exchange subsystem, heat is returned to the thermal power unit again after heat exchange, and the output of the thermal power unit is increased. The decoupling of the engine and the boiler can be realized by adding the heat storage system, when the thermal power unit requires low-load operation, the combustion amount of the boiler is unchanged, the loads of the high-pressure cylinder and the medium/low-pressure cylinder of the steam turbine are reduced, high-grade energy is stored by using the heat storage medium, the load change is not influenced by the lowest stable combustion load of the boiler, the peak load adjusting range and flexibility of the thermal power unit are increased, the requirement of deep peak adjustment can be realized, when the thermal power unit requires high-load operation, the combustion amount of the boiler is unchanged, the heat release of the heat storage medium is utilized to promote the loads of the medium/low-pressure cylinder of the high-pressure cylinder and the medium/low-pressure cylinder of the steam turbine, and the energy utilization efficiency is improved.
Drawings
FIG. 1 is a schematic diagram of a reduced output configuration of a thermal storage coupled thermal power unit system according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a structure for increasing output of a thermal storage coupled thermal power generating unit system according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a thermal storage coupled thermal power unit system with reduced output according to another embodiment of the present invention;
fig. 4 is a schematic structural diagram of an increased output of a thermal storage coupled thermal power generating unit system according to another embodiment of the utility model.
Wherein: 1-a boiler; 2-a heat storage system; 21-a heat exchange subsystem; 211-main steam-molten salt heat exchanger; 212-reheat steam-molten salt heat exchanger; 22-a molten salt heat storage subsystem; 23-an exothermic subsystem; 231-molten salt-feedwater heat exchanger; 232-molten salt-steam heat exchanger; 3-high pressure cylinder of steam turbine; 4-turbine medium/low pressure cylinder; 51-a first feedwater heater; 52-a second feedwater heater; 53-third feedwater heater; 54-a fourth feedwater heater; 55-fifth water supply heater; 56-sixth feedwater heater; 57-a seventh feedwater heater; 6-a deaerator; 7-a condenser.
Detailed Description
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the utility model described herein are capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
The utility model is described in further detail below with reference to the accompanying drawings:
referring to fig. 1 and 2, in an embodiment of the present invention, a thermal storage coupled thermal power generating unit system based on molten salt heat storage is provided, which is characterized by including a thermal power generating unit, a thermal power subsystem, and a heat storage system 2.
The thermal power generating unit comprises a boiler 1, a steam turbine and a generator, and the thermal power subsystem comprises a condenser 7, a multi-stage low-pressure heater, a deaerator 6 and a multi-stage high-pressure heater which are sequentially connected in series according to the flow direction of a working medium; the heat storage system 2 includes a heat exchange subsystem 21, a molten salt heat storage subsystem 22, and a heat release subsystem 23. A main steam outlet of the boiler 1 is connected with a steam inlet of a steam turbine high-pressure cylinder 3, a steam exhaust port of the steam turbine high-pressure cylinder 3 is connected with a reheater inlet of the boiler 1, a reheater outlet of the boiler 1 is connected with a steam inlet of a steam turbine middle/low-pressure cylinder 4, the steam turbine high-pressure cylinder 3 and the steam turbine middle/low-pressure cylinder 4 are both connected with a generator, and the steam turbine high-pressure cylinder 3 and the steam turbine middle/low-pressure cylinder 4 jointly drive the generator to generate electricity; the steam outlet of the turbine middle/low pressure cylinder 4 is connected with the inlet of the condenser 7, and the water supply outlet of the multi-stage high pressure heater is connected with the inlet of the preheater of the boiler 1.
A steam inlet of the heat exchange subsystem 21 is connected with a main steam outlet and a reheat steam outlet of the boiler 1; a steam outlet of the heat exchange subsystem 21 is connected with a reheater inlet of the boiler 1 and a steam inlet of the deaerator 6; a low-temperature molten salt outlet and a low-temperature molten salt inlet of the molten salt heat storage subsystem 22 are respectively connected with a low-temperature molten salt inlet of the heat exchange subsystem 21 and a low-temperature molten salt outlet of the heat release subsystem 23; the high-temperature molten salt outlet and the high-temperature molten salt inlet of the molten salt heat storage subsystem 22 are respectively connected with the high-temperature molten salt inlet of the heat release subsystem 23 and the high-temperature molten salt outlet of the heat exchange subsystem 21; and a working medium inlet and a working medium outlet of the heat release subsystem 23 are respectively connected with a water supply outlet of the multi-stage high-pressure heater and the boiler 1.
In one possible implementation mode, the multistage low-pressure heater comprises a plurality of low-pressure feed water heaters which are sequentially connected in series according to the flow direction of a working medium, the number of the low-pressure feed water heaters is generally 3-4, and according to the flow direction of the working medium, a feed water inlet of the first stage low-pressure feed water heater is connected with a feed water outlet of the condenser 7; the water supply outlet of the last stage of low-pressure water supply heater is connected with the water supply inlet of the deaerator 6, and the steam inlets of the low-pressure water supply heaters are connected with the steam outlet of the turbine middle/low pressure cylinder 4.
Specifically, in this embodiment, the multi-stage low-pressure heater includes a fifth feedwater heater 55, a fourth feedwater heater 54, and a third feedwater heater 53 connected in series in sequence according to the flow direction of the working medium; the feed water outlets of the fifth feed water heater 55, the fourth feed water heater 54 and the third feed water heater 53 are all connected with the inlet of the solid heat reservoir 2; a feed water outlet of the third feed water heater 53 is connected with a feed water inlet of the deaerator 6, and a feed water inlet of the fifth feed water heater 55 is connected with a feed water outlet of the condenser 7; the steam inlets of the fifth feedwater heater 55, the fourth feedwater heater 54 and the third feedwater heater 53 are all connected to the exhaust steam port of the steam turbine middle/low pressure cylinder 4.
The multistage high-pressure heater comprises a plurality of high-pressure water supply heaters which are sequentially connected in series according to the flow direction of a working medium, the number of the high-pressure water supply heaters is generally 2-3, and according to the flow direction of the working medium, a water supply inlet of the first-stage high-pressure water supply heater is connected with a water supply outlet of the deaerator 6; the water supply outlet of the last stage high-pressure water supply heater is connected with the inlet of the preheater of the boiler 1 and the working medium inlet of the heat release subsystem 23, and the steam inlets of the high-pressure heaters are connected with the steam exhaust port of the high-pressure cylinder 3 of the steam turbine.
Specifically, in this embodiment, the multi-stage high-pressure heater includes a second water supply heater 52 and a first water supply heater 51 which are connected in series in sequence according to the flow direction of the working medium, wherein water supply outlets of the second water supply heater 52 and the first water supply heater 51 are both connected with an inlet of the solid heat reservoir 2; the feed water inlet of the second feed water heater 52 is connected with the feed water outlet of the deaerator 6; the steam inlets of the second water supply heater 52 and the first water supply heater 51 are both connected with the steam outlet of the steam turbine high-pressure cylinder 3; the feed water outlet of the first feed water heater 51 is connected with the preheater inlet of the boiler 1 and the working medium inlet of the heat release subsystem 23.
The heat exchange subsystem 21 comprises a plurality of main steam-molten salt heat exchangers 211 and a plurality of reheat steam-molten salt heat exchangers 212; the molten salt heat storage subsystem 22 comprises a plurality of high-temperature molten salt storage tanks, a plurality of low-temperature molten salt storage tanks, a plurality of high-temperature molten salt pumps and a plurality of low-temperature molten salt pumps; the heat rejection subsystem 23 includes a number of molten salt-feedwater heat exchangers 231 and a number of molten salt-cold reheat steam heat exchangers 232. A main steam outlet of the boiler 1 is connected with a steam inlet of a main steam-molten salt heat exchanger 211 in a heat exchange subsystem 21, and a steam outlet of the main steam-molten salt heat exchanger 211 in the heat exchange subsystem 21 is connected with a reheater inlet of the boiler 1; the outlet of the reheated steam of the boiler 1 is connected with the steam inlet of the reheated steam-molten salt heat exchanger 212 in the heat exchange subsystem 21, and the steam outlet of the reheated steam-molten salt heat exchanger 212 in the heat exchange subsystem 21 is connected with the steam inlet of the deaerator 6. A feed water outlet of the first feed water heater 51 is connected with a feed water inlet of the molten salt-feed water heat exchanger 231 in the heat release subsystem 23, and a feed water outlet of the molten salt-feed water heat exchanger 231 in the heat release subsystem 23 is connected with a preheater inlet of the boiler 1; the steam outlet of the high-pressure turbine cylinder 3 is connected with the steam inlet of the molten salt-steam heat exchanger 232 in the heat release subsystem 23, and the steam outlet of the molten salt-steam heat exchanger 232 in the heat release subsystem 23 is connected with the reheater steam inlet of the boiler 1.
The low-temperature molten salt outlet of the molten salt heat storage subsystem 22 is respectively connected with the low-temperature molten salt inlets of the main steam-molten salt heat exchanger 211 and the reheat steam-molten salt heat exchanger 212 in the heat exchange subsystem 21, the high-temperature molten salt outlets of the main steam-molten salt heat exchanger 211 and the reheat steam-molten salt heat exchanger 212 in the heat exchange subsystem 21 are respectively connected with the high-temperature molten salt inlet of the molten salt heat storage subsystem 22, the high-temperature molten salt outlet of the molten salt heat storage subsystem 22 is connected with the high-temperature molten salt inlet of the molten salt-steam heat exchanger 232 in the heat release subsystem 23, the medium-temperature molten salt outlet of the molten salt-steam heat exchanger 232 is connected with the medium-temperature molten salt inlet of the molten salt-feedwater heat exchanger 231 in the heat release subsystem 23, and the medium-temperature molten salt outlet of the molten salt-feedwater heat exchanger 231 is connected with the low-temperature molten salt inlet of the molten salt heat storage subsystem 22.
Optionally, flow meters are arranged on the pipelines between the condenser 7 and the multistage low-pressure heater and the pipelines between the deaerator 6 and the multistage high-pressure heater, so that the measurement of the flow in the pipelines is realized. And regulating valves are arranged on a pipeline between the boiler 1 and the heat exchange subsystem 21 and a pipeline between the multi-stage high-pressure heater and the heat release subsystem 23. The steam inlet of the multistage low-pressure heater is connected with the steam outlet of the high-pressure cylinder 3 of the steam turbine; the steam inlet of the multistage high-pressure heater is connected with the steam outlet of the turbine middle/low pressure cylinder 4, so that the full utilization of the steam is realized, the energy utilization efficiency is improved, and the energy loss is reduced.
Wherein the molten salt is a mixture containing potassium nitrate and sodium nitrate or potassium nitrate and sodium nitrite as main components.
In this embodiment, the working process and the principle of the heat storage coupled thermal power unit system based on molten salt heat storage are as follows:
the first working state: when the thermal power generating unit needs load reduction and peak load regulation, regulating valves, specifically steam regulating valves, are arranged on a pipeline from a main steam outlet of the boiler 1 to the heat exchange subsystem 21 and a pipeline from a reheat steam outlet of the boiler 1 to the heat exchange subsystem 21, the load of the boiler 1 is kept unchanged, the steam regulating valves are opened, partial main steam and reheat steam are respectively led out from the main steam outlet and the reheat steam outlet of the boiler 1 to enter the heat exchange subsystem 21, and heat is stored in the fused salt heat storage subsystem 22 in a high-temperature fused salt form after being subjected to heat exchange with low-temperature fused salt; the flow rates of the led main steam and the reheated steam are controlled by adjusting the opening degree of the steam adjusting valve, and then load and peak load are reduced.
The second working state: when the thermal power generating unit needs load increase and peak load regulation, regulating valves are respectively arranged on a pipeline from a water supply outlet of the first water supply heater 51 to the heat release subsystem 23 and a pipeline from a steam outlet of the steam turbine high-pressure cylinder 3 to the heat release subsystem 23, the load of the boiler 1 is kept unchanged, part of steam is led out from a steam outlet of the steam turbine high-pressure cylinder 3 to enter the heat release subsystem 23 to exchange heat with high-temperature molten salt, part of water supply is led out from the water supply outlet of the first water supply heater 51 to enter the heat release subsystem 23 to continuously exchange heat with the high-temperature molten salt, and heat in the molten salt is respectively returned to the thermal power generating unit from the molten salt heat storage subsystem 22 in a mode of increasing the temperature of cold and reheated steam and increasing the temperature of the water supply in sequence; the flow of the water supply and the steam which are led out is controlled by adjusting the opening degrees of the water supply adjusting valve and the steam adjusting valve, so that the purpose of load-rising and peak-load regulation is achieved.
Referring to fig. 3 and 4, in yet another embodiment of the present invention, a thermal storage coupled thermal power generating unit system based on molten salt heat storage is provided, and compared with the previous embodiment, except for the difference in the configuration and connection of the heat release subsystem 23, the description in the previous embodiment may be referred to. The heat release subsystem 23 in this embodiment can be replaced with a steam generator as a whole; the working medium inlet of the steam generator is connected with the feed water outlet of the multi-stage high-pressure heater, and the working medium outlet of the steam generator is connected with the superheater header of the boiler 1.
In this embodiment, the working process and the principle of the heat storage coupled thermal power unit system based on molten salt heat storage are as follows:
the first working state: when the thermal power generating unit needs load reduction and peak load regulation, regulating valves, specifically steam regulating valves, are arranged on a steam inlet pipeline from a main steam outlet of the boiler 1 to the heat exchange subsystem 21 and a steam inlet pipeline from a reheat steam outlet of the boiler 1 to the heat exchange subsystem 21, the load of the boiler 1 is kept unchanged, the steam regulating valves are opened, partial main steam and reheat steam are respectively led out from the main steam outlet and the reheat steam outlet of the boiler 1 to enter the heat exchange subsystem 21, and after heat exchange with low-temperature molten salt, heat is stored in the molten salt heat storage subsystem 22 in a high-temperature molten salt form; the flow rates of the led main steam and the reheated steam are controlled by adjusting the opening degree of the steam adjusting valve, so that the purpose of load reduction and peak regulation is achieved.
The second working state: when the thermal power generating unit needs load increase and peak load regulation, a feed water regulating valve is arranged on a feed water inlet pipeline from a feed water outlet of the last stage high-pressure heater to the steam generation subsystem 23, the load of the boiler 1 is kept unchanged, part of feed water is led out from the feed water outlet of the last stage high-pressure heater to enter the steam generation subsystem 23, after heat exchange with high-temperature molten salt, the feed water is changed into high-temperature steam, the high-temperature steam enters a superheater header, and heat is returned to the unit system from the molten salt heat storage subsystem in the form of high-temperature steam; the water supply flow rate led out is controlled by adjusting the opening degree of the water supply adjusting valve, so that the purpose of load rising and peak regulation is achieved.
According to the heat storage coupling thermal power generating unit system based on molten salt heat storage, when the thermal power generating unit participates in power grid peak shaving and needs to reduce output, partial main steam and reheat steam are led out from the unit and enter the heat storage system 2, heat is stored in the molten salt heat storage subsystem 22 in a high-temperature molten salt mode, the output of the unit is reduced, and meanwhile partial heat is stored in the heat storage system 2; when the unit participates in power grid peak shaving and needs to increase output, part of feed water is led out from the thermal power unit and enters the heat exchange subsystem 21, heat is returned to the thermal power unit again after heat exchange, and the output of the thermal power unit is increased. The heat storage system 2 is added to achieve machine-furnace decoupling, when a thermal power unit requires low-load operation, the combustion quantity of the boiler 1 is unchanged, the loads of the high-pressure cylinder 3 of the steam turbine and the medium/low-pressure cylinder 4 of the steam turbine are reduced, high-grade energy is stored by using a heat storage medium, the load change is not influenced by the lowest stable combustion load of the boiler 1, the peak load adjusting range and flexibility of the thermal power unit are increased, the requirement of deep peak adjustment can be met, when the thermal power unit requires high-load operation, the combustion quantity of the boiler 1 is unchanged, the heat storage medium is used for releasing heat to improve the loads of the high-pressure cylinder 3 of the steam turbine and the medium/low-pressure cylinder 4 of the steam turbine, and the energy utilization efficiency is improved.
Meanwhile, the heat storage medium is used for storing energy, and the load of the boiler 1 is not reduced, so that the efficiency is higher, and the overall efficiency is higher compared with that of the conventional deep phase modulation. When the thermal power generating unit does not require the down-peak regulation operation, the heat is returned to the thermal power generating unit by using the energy stored in the heat storage system 2 in a mode of heating the feed water and the cold reheat steam, so that the coal burning quantity entering the boiler 1 is reduced, and the overall efficiency of the unit is improved.
The above-mentioned contents are only for illustrating the technical idea of the present invention, and the protection scope of the present invention is not limited thereby, and any modification made on the basis of the technical idea of the present invention falls within the protection scope of the claims of the present invention.
Claims (9)
1. A heat storage coupling thermal power generating unit system based on molten salt heat storage is characterized by comprising a thermal power generating unit, a thermal power subsystem and a heat storage system (2);
the thermal power generating unit comprises a boiler (1), a turbine high-pressure cylinder (3), a turbine medium/low-pressure cylinder (4) and a generator, and the thermodynamic subsystem comprises a condenser (7), a multistage low-pressure heater, a deaerator (6) and a multistage high-pressure heater which are sequentially connected in series according to the flow direction of a working medium; the heat storage system (2) comprises a heat exchange subsystem (21), a molten salt heat storage subsystem (22) and a heat release subsystem (23);
a main steam outlet of the boiler (1) is connected with a steam inlet of a high-pressure steam turbine cylinder (3), a steam outlet of the high-pressure steam turbine cylinder (3) is connected with an inlet of a reheater of the boiler (1), an outlet of the reheater of the boiler (1) is connected with a steam inlet of a medium/low-pressure steam turbine cylinder (4), and the high-pressure steam turbine cylinder (3) and the medium/low-pressure steam turbine cylinder (4) are both connected with a generator; the exhaust port of the turbine medium/low pressure cylinder (4) is connected with the inlet of a condenser (7), and the feed water outlet of the multistage high-pressure heater is connected with the inlet of a preheater of the boiler (1);
a steam inlet of the heat exchange subsystem (21) is connected with a main steam outlet and a reheat steam outlet of the boiler (1); a steam outlet of the heat exchange subsystem (21) is connected with a reheater inlet of the boiler (1) and a steam inlet of the deaerator (6); a low-temperature molten salt outlet and a low-temperature molten salt inlet of the molten salt heat storage subsystem (22) are respectively connected with a low-temperature molten salt inlet of the heat exchange subsystem (21) and a low-temperature molten salt outlet of the heat release subsystem (23); a high-temperature molten salt outlet and a high-temperature molten salt inlet of the molten salt heat storage subsystem (22) are respectively connected with a high-temperature molten salt inlet of the heat release subsystem (23) and a high-temperature molten salt outlet of the heat exchange subsystem (21); the working medium inlet and the working medium outlet of the heat release subsystem (23) are respectively connected with the water supply outlet of the multi-stage high-pressure heater and the boiler (1).
2. The fused salt heat storage-based heat storage coupled thermal power generating unit system according to claim 1, wherein the heat exchange subsystem (21) comprises a plurality of main steam-fused salt heat exchangers (211) and a plurality of reheat steam-fused salt heat exchangers (212);
a steam inlet of the main steam-molten salt heat exchanger (211) is connected with a main steam outlet of the boiler (1), and a steam outlet of the main steam-molten salt heat exchanger (211) is connected with an inlet of a reheater of the boiler (1); a steam inlet of the reheat steam-molten salt heat exchanger (212) is connected with a reheat steam outlet of the boiler (1); a steam outlet of the reheat steam-molten salt heat exchanger (212) is connected with a steam inlet of the deaerator (6); the low-temperature molten salt inlets of the main steam-molten salt heat exchanger (211) and the reheat steam-molten salt heat exchanger (212) are connected with the low-temperature molten salt outlet of the molten salt heat storage subsystem (22), and the high-temperature molten salt outlets of the main steam-molten salt heat exchanger (211) and the reheat steam-molten salt heat exchanger (212) are connected with the high-temperature molten salt inlet of the molten salt heat storage subsystem (22).
3. The fused salt heat storage based heat storage coupled thermal power generating unit system of claim 1, wherein the fused salt heat storage subsystem (22) comprises a high temperature fused salt storage tank, a low temperature fused salt storage tank, a high temperature fused salt pump and a low temperature fused salt pump;
a molten salt inlet of the high-temperature molten salt storage tank is connected with a high-temperature molten salt outlet of the heat exchange subsystem (21), and a molten salt outlet of the high-temperature molten salt storage tank is connected with a high-temperature molten salt inlet of the heat release subsystem (23) through a high-temperature molten salt pump; the fused salt entry of low temperature fused salt storage tank and the low temperature fused salt exit linkage of exothermal subsystem (23), the fused salt export of low temperature fused salt storage tank passes through the low temperature fused salt entry linkage of low temperature fused salt pump and heat transfer subsystem (21).
4. The molten salt heat storage-based heat-storage coupled thermal power generating unit system according to claim 1, wherein the heat release subsystem (23) comprises a molten salt-feedwater heat exchanger (231) and a molten salt-steam heat exchanger (232);
a feed water inlet of the molten salt-feed water heat exchanger (231) is connected with a feed water outlet of the multi-stage high-pressure heater, and a feed water outlet of the molten salt-feed water heat exchanger (231) is connected with an inlet of a preheater of the boiler (1); a steam inlet of the fused salt-steam heat exchanger (232) is connected with a steam outlet of the high-pressure cylinder (3) of the steam turbine, and a steam outlet of the fused salt-steam heat exchanger (232) is connected with a reheater steam inlet of the boiler (1);
the high-temperature molten salt inlet of the molten salt-steam heat exchanger (232) is connected with the high-temperature molten salt outlet of the molten salt heat storage subsystem (22), the medium-temperature molten salt outlet of the molten salt-steam heat exchanger (232) is connected with the low-temperature molten salt inlet of the molten salt-water supply heat exchanger (231), and the medium-temperature molten salt outlet of the molten salt-water supply heat exchanger (231) is connected with the low-temperature molten salt inlet of the molten salt heat storage subsystem (22).
5. The molten salt heat storage based heat storage coupled thermal power generating unit system of claim 1, wherein the heat release subsystem (23) is a steam generator;
the working medium inlet of the steam generator is connected with the feed water outlet of the multi-stage high-pressure heater, and the working medium outlet of the steam generator is connected with the superheater header of the boiler (1).
6. The thermal storage coupled thermal power generating unit system based on molten salt heat storage according to claim 1, wherein the multistage low-pressure heater comprises a plurality of low-pressure feed water heaters which are sequentially connected in series according to a working medium flow direction, and a feed water inlet of a first stage low-pressure feed water heater is connected with a feed water outlet of a condenser (7) according to the working medium flow direction; the water supply outlet of the last stage of low-pressure water supply heater is connected with the water supply inlet of the deaerator (6), and the steam inlets of the low-pressure water supply heaters are connected with the steam exhaust port of the steam turbine medium/low pressure cylinder (4).
7. The thermal storage coupled thermal power generating unit system based on molten salt heat storage is characterized in that the multistage high-pressure heater comprises a plurality of high-pressure feed water heaters which are sequentially connected in series according to the flow direction of a working medium, and according to the flow direction of the working medium, a feed water inlet of a first stage high-pressure feed water heater is connected with a feed water outlet of a deaerator (6); the water supply outlet of the last stage high-pressure water supply heater is connected with the inlet of a preheater of the boiler (1) and the working medium inlet of the heat release subsystem (23), and the steam inlets of the high-pressure heaters of all stages are connected with the steam exhaust port of the high-pressure cylinder (3) of the steam turbine.
8. The thermal storage coupled thermal power unit system based on molten salt heat storage is characterized in that flow meters are arranged on a pipeline between the condenser (7) and the multistage low-pressure heater and a pipeline between the deaerator (6) and the multistage high-pressure heater.
9. The thermal storage coupled thermal power unit system based on molten salt heat storage according to claim 1, characterized in that regulating valves are arranged on a pipeline between the boiler (1) and the heat exchange subsystem (21) and a pipeline between the multi-stage high-pressure heater and the heat release subsystem (23).
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115822742A (en) * | 2022-10-24 | 2023-03-21 | 国电投重庆能源研究院有限公司 | Heat storage power generation system of accumulation bed |
| CN116845933A (en) * | 2023-09-01 | 2023-10-03 | 山西中能天胜科技有限公司 | Power distribution system based on steam heat exchange coupling electrode heating fused salt |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115822742A (en) * | 2022-10-24 | 2023-03-21 | 国电投重庆能源研究院有限公司 | Heat storage power generation system of accumulation bed |
| CN116845933A (en) * | 2023-09-01 | 2023-10-03 | 山西中能天胜科技有限公司 | Power distribution system based on steam heat exchange coupling electrode heating fused salt |
| CN116845933B (en) * | 2023-09-01 | 2023-11-28 | 山西中能天胜科技有限公司 | Power distribution system based on steam heat exchange coupling electrode heating fused salt |
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