CN220871539U - Fused salt heat storage system capable of realizing decoupling of machine furnace - Google Patents
Fused salt heat storage system capable of realizing decoupling of machine furnace Download PDFInfo
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- 150000003839 salts Chemical class 0.000 title claims abstract description 230
- 238000005338 heat storage Methods 0.000 title claims abstract description 60
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 120
- 238000010248 power generation Methods 0.000 claims abstract description 35
- 238000003303 reheating Methods 0.000 claims description 57
- 230000001105 regulatory effect Effects 0.000 claims description 25
- 239000003638 chemical reducing agent Substances 0.000 claims description 19
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- 238000002485 combustion reaction Methods 0.000 abstract description 9
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- 229910052799 carbon Inorganic materials 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 4
- 230000000630 rising effect Effects 0.000 description 4
- 238000002844 melting Methods 0.000 description 3
- 230000008018 melting Effects 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
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Abstract
The molten salt heat storage system comprises a thermal power generation unit thermodynamic system, a switchable turbine high-pressure bypass system and a molten salt heat storage system: the molten salt heat storage system comprises a low-temperature molten salt tank, a high-temperature molten salt tank, a water supply booster pump, a heat storage subsystem and a heat release subsystem; the heat storage subsystem is used for exchanging heat between the heat of the first reheat steam and molten salt in the low-temperature molten salt tank and storing the molten salt after heat exchange in the high-temperature molten salt tank; the heat release subsystem heats the water supply passing through the outlet of the deaerator into superheated steam which can be sent into a low-pressure cylinder of a steam turbine to do work by using the heat of molten salt in the high-temperature molten salt tank. When the unit peak regulation is operated, the boiler keeps running without oil feeding and under stable combustion load, the surplus part of main steam of the boiler is extracted to reheat cold steam through a high-pressure bypass of the steam turbine, the reheat cold steam is heated to reheat hot steam through the boiler to heat molten salt, the peak regulation operation of the unit and the heat storage function of the molten salt heat storage system are realized, and the heat release subsystem is used for providing working steam for the steam turbine.
Description
Technical Field
The utility model belongs to the technical field of thermal power generation, and particularly relates to a molten salt heat storage system capable of realizing decoupling of a machine furnace.
Background
After the carbon reaching peak and the carbon neutralization target of China are put forward, the steps of cleaning and low-carbon conversion of the electric power system are further accelerated, the renewable energy generating capacity and the renewable energy installation capacity are rapidly increased, and the thermal power generating capacity and the thermal power generation installation capacity ratio continuously slide down. By the end of 12 months in 2022, the total installed capacity of various types of power generation in China is 25.6 hundred million kilowatts, wherein the installed capacity of thermal power generation is 13.324 hundred million kilowatts, and the proportion is 52%; the cumulative value of 2022 generated energy in China is 83886.3 hundred million kilowatt-hours, wherein the thermal power generation capacity is 58531.3 hundred million kilowatt-hours, and the ratio is 69.8%. The data show that China makes a table rate for the world in the aspects of improving the energy structure, protecting the ecological environment and realizing the sustainable development of human society, but meanwhile, people also need to see a gap between two groups of data, namely the installed capacity of thermal power generation is only 52%, and the provided power generation rate is close to 70%. The aspect shows that the thermal power generation is still a support for keeping the power supply of China stable, particularly when renewable energy is difficult to meet the requirements, the thermal power generation is used for supplying power for protecting driving and sailing in winter for 'welcome peaks' in all areas, and heating and reserving work of residents in winter is performed in a 'full grid power' state; on the other hand, the renewable energy utilization rate is still to be improved, the phenomena of wind abandoning and light abandoning are further reduced, the construction of infrastructures such as new energy delivery channels and grid racks is quickened, and a clean, low-carbon, safe and efficient new energy supply system is constructed. The thermal power generation rate is far more than the thermal power generation installed capacity rate, and the essence behind is that: renewable energy sources have larger defects, namely the characteristics of instantaneous fluctuation, intermittence, unpredictability and the like, and thermal power generation is required to play a role in peak regulation and valley filling, so that the stable operation of an electric power supply system is ensured.
Therefore, a fused salt heat storage system capable of realizing decoupling of a machine furnace is needed, the flexibility and the deep peak shaving capacity of a thermal power unit are further improved, and the peak shaving requirement of a power grid is responded.
Disclosure of utility model
In order to solve the problems in the prior art, the utility model aims to provide a molten salt heat storage system capable of realizing machine furnace decoupling, which is suitable for deep peak shaving of a thermal power unit.
The molten salt heat storage system comprises a thermal power generation unit thermodynamic system, a turbine high-pressure bypass system and a molten salt heat storage system:
the thermal power generating unit thermodynamic system for generating power comprises a generator, a deaerator, a boiler, a turbine high-pressure cylinder, a turbine medium-pressure cylinder and a turbine low-pressure cylinder;
the turbine high-pressure bypass system capable of being opened or closed comprises a turbine high-pressure bypass temperature and pressure reducer;
The main steam outlet of the boiler can be selectively connected to the steam inlet of the high-pressure bypass temperature and pressure reducer of the steam turbine, the steam outlet of the high-pressure bypass temperature and pressure reducer of the steam turbine is connected with the reheat steam inlet of the boiler, and the reheat steam outlet of the boiler is connected with the molten salt heat storage system and the medium-pressure cylinder of the steam turbine in parallel; the high-pressure bypass system of the steam turbine is started and the reheat steam of the boiler can be split into first reheat steam flowing into the molten salt heat storage system and second reheat steam flowing into the medium pressure cylinder of the steam turbine;
The steam outlet of the high-pressure cylinder of the steam turbine is connected with a reheat steam inlet of the boiler and a steam outlet of the high-pressure bypass temperature and pressure reducer of the steam turbine through pipelines;
the molten salt heat storage system comprises a low-temperature molten salt tank, a high-temperature molten salt tank, a water supply booster pump, a heat storage subsystem and an heat release subsystem;
The heat storage subsystem is used for exchanging heat between the heat of the first reheat steam and molten salt in the low-temperature molten salt tank and storing the molten salt after heat exchange to the high-temperature molten salt tank;
The heat release subsystem heats the water supply passing through the outlet of the deaerator into superheated steam capable of being fed into the steam inlet of the low-pressure cylinder of the steam turbine by using the heat of molten salt in the high-temperature molten salt tank, and the heat release subsystem comprises a high-temperature molten salt pump, a molten salt-steam superheater, a molten salt-steam generator and a molten salt-water supply preheater which are connected in sequence;
The molten salt outlet of the high-temperature molten salt tank is connected with the molten salt inlet of the molten salt-steam superheater through a high-temperature molten salt pump; the molten salt outlet of the molten salt-steam superheater is connected with the molten salt inlet of the molten salt-steam generator; the molten salt outlet of the molten salt-steam generator is connected with the molten salt inlet of the molten salt-water supply preheater; the molten salt outlet of the molten salt-water supply preheater is connected with the molten salt inlet of the low-temperature molten salt tank;
The second water supply outlet of the deaerator is connected with the water supply inlet of the molten salt-water supply preheater through the water supply booster pump; the water supply outlet of the molten salt-water supply preheater is connected with the water supply inlet of the molten salt-steam generator; the steam outlet of the fused salt-steam generator is connected with the steam inlet of the fused salt-steam superheater; the steam outlet of the fused salt-steam superheater is connected with the steam inlet of the low-pressure cylinder of the steam turbine;
The heat storage subsystem comprises a low-temperature molten salt pump, a molten salt-low-temperature reheat steam cooler, a molten salt-high-temperature reheat steam cooler and a reheat steam condenser;
The molten salt outlet of the low-temperature molten salt tank is connected with the molten salt inlet of the molten salt-low-temperature reheat steam cooler through the low-temperature molten salt pump; the molten salt outlet of the molten salt-low temperature reheating steam cooler is connected with the molten salt inlet of the molten salt-high temperature reheating steam cooler; the molten salt outlet of the molten salt-high temperature reheating steam cooler is connected with the molten salt inlet of the high temperature molten salt tank;
The first reheat steam is connected with a steam inlet of the fused salt-low temperature reheat steam cooler through a steam outlet of the fused salt-high temperature reheat steam cooler; the steam outlet of the fused salt-low temperature reheat steam cooler is connected with the steam inlet of the reheat steam condenser; the drain outlet of the reheat steam condenser is connected with the drain inlet of the deaerator through a pipeline;
The steam outlet of the fused salt-high temperature reheat steam cooler is connected in parallel with the steam inlet of the fused salt-low temperature reheat steam cooler and the steam inlet of the low pressure cylinder of the steam turbine so that the steam at the output end of the fused salt-high temperature reheat steam cooler is split into two parts of steam, wherein one part of steam sequentially passes through the fused salt-low temperature reheat steam cooler and the reheat steam condenser, and the other part of steam is input into the low pressure cylinder of the steam turbine;
And the steam outlet of the fused salt-high temperature reheating steam cooler, the steam outlet of the fused salt-steam superheater and the steam outlet of the middle pressure cylinder of the steam turbine are respectively connected with the steam inlet of the low pressure cylinder of the steam turbine.
In the technical scheme, the molten salt heat storage system capable of realizing decoupling of the machine furnace has the following beneficial effects:
When the unit peak regulation is operated, the boiler keeps the lowest stable combustion load operation without oil feeding, the main steam of the surplus part of the boiler is extracted to be cooled and heated to be reheated steam through a high-pressure bypass of the steam turbine, the reheated cold steam is heated to be reheated hot steam through the boiler, and the reheated hot steam of the surplus part of the boiler is extracted to heat molten salt, so that the peak regulation operation of the unit and the heat storage function of the molten salt heat storage system are realized; when the unit is in peak operation, the water supply at the outlet of the high-temperature molten salt heating deaerator generates superheated steam, and the superheated steam enters the low-pressure cylinder of the steam turbine through the medium-low pressure cylinder communication pipe to do work and generate power, so that the peak operation of the unit and the heat release function of the molten salt heat storage system are realized. The utility model has small amount of change on the existing thermal power unit system and equipment, reasonable matching of all parameters of the system, high reliability, short construction period and less investment, and realizes the requirements of machine furnace decoupling and deep peak regulation of the thermal power unit.
According to the fused salt heat storage system capable of realizing machine furnace decoupling, when the unit depth peak shaving is performed, the boiler operates with the lowest stable combustion load without oil, and the steam turbine operates with the minimum stable load, so that the machine furnace decoupling capacity and the operation flexibility of the thermal power unit are greatly improved.
The high-pressure bypass system of the steam turbine is utilized to reduce the temperature and pressure of part of main steam to the steam discharge of the high-pressure cylinder of the steam turbine, and the steam is heated into reheat hot steam through the boiler, so that the parameter matching of the superheater and the reheater of the boiler is better, and the safe operation of the boiler is facilitated.
And part of main steam is extracted before the inlet of the high-pressure cylinder of the steam turbine, and part of reheat hot steam is extracted before the inlet of the medium-pressure cylinder of the steam turbine, so that the parameter matching of the high-pressure cylinder and the medium-pressure cylinder of the steam turbine is better, and the safe operation of the steam turbine is facilitated.
The split-flow main steam pipeline from the main steam of the boiler outlet to the fused salt heat storage system and the steam pipeline from the fused salt heat storage system to the high-pressure cylinder of the steam turbine are not arranged, so that the pipeline arrangement can be saved, the initial investment of the system can be reduced, and the response speed of the fused salt heat storage system can be improved.
The superheated steam generated by the fused salt-steam superheater enters the low-pressure cylinder of the steam turbine to do work through the communication pipe of the middle-low pressure cylinder, and the superheated steam does not enter the high-pressure cylinder of the steam turbine to do work, so that the difficulty of the parallel steam operation of the main steam generated by the fused salt-steam generation system and the main steam at the outlet of the boiler is avoided, and the system is easier to adjust.
Superheated steam generated by the fused salt-steam superheater enters a low-pressure cylinder of a steam turbine through a communication pipe of the middle-low pressure cylinder to do work, reheat hot steam is not generated, and the steam merging operation difficulty of reheat hot steam generated by a fused salt-steam generating system and reheat hot steam of a boiler outlet is avoided, so that the system is easier to adjust.
The molten salt flow rate during heat release of the molten salt heat storage system and the superheated steam flow rate generated by the molten salt-steam generation system can be regulated and increased, so that the rapid load rising rate during peak of the unit is improved.
Drawings
In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings required for the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments described in the present utility model, and other drawings may be obtained according to these drawings for a person having ordinary skill in the art.
Fig. 1 is a schematic structural diagram of a molten salt heat storage system of the present disclosure.
Reference numerals:
1. A boiler; 2.1, a high-pressure cylinder of a steam turbine; 2.2, a middle pressure cylinder of the steam turbine; 2.3, a low-pressure cylinder of the steam turbine; 3. a generator; 4. a condenser; 5. a condensate pump; 6.1, 1 stage low pressure heater; 6.2, 2-stage low-pressure heater; 6.3, 3-stage low-pressure heater; 6.4, 4-stage low pressure heater; 7. a deaerator; 8. a water feed pump; 9.1, 1-stage high-pressure heater; 9.2, 2-stage high-pressure heater; 9.3, 3-stage high-pressure heater; 10. a high-pressure bypass temperature and pressure reducer of the steam turbine; 11. a low-temperature salt melting tank; 12. a low temperature molten salt pump; 13. a molten salt-low temperature reheat steam cooler; 14. molten salt-high temperature reheat steam cooler; 15. a high temperature salt melting tank; 16. a high temperature molten salt pump; 17. a molten salt-steam superheater; 18. a molten salt-steam generator; 19. a molten salt-feed water preheater; 20. a water supply booster pump; 21. reheat steam condensers.
Detailed Description
In order to make the technical scheme of the present utility model better understood by those skilled in the art, the present utility model will be further described in detail with reference to the accompanying drawings.
As shown in fig. 1, a molten salt heat storage system capable of realizing machine furnace decoupling comprises a thermal power generation unit thermodynamic system, an openable or closable turbine high-pressure bypass system and a molten salt heat storage system:
The thermal power generating unit thermodynamic system for generating power comprises a boiler 1, a turbine high-pressure cylinder 2.1, a turbine medium-pressure cylinder 2.2, a turbine low-pressure cylinder 2.3, a generator 3, a condenser 4, a condensate pump 5, a 4-stage low-pressure heater 6.4, a 3-stage low-pressure heater 6.3, a 2-stage low-pressure heater 6.2, a 1-stage low-pressure heater 6.1, a deaerator 7, a water supply pump 8, a 3-stage high-pressure heater 9.3, a 2-stage high-pressure heater 9.2 and a 1-stage high-pressure heater 9.1.
The turbine high-pressure bypass system capable of being opened or closed comprises a turbine high-pressure bypass temperature and pressure reducer 10; the turbine high pressure bypass attemperator 10 has an inlet steam duct, an inlet attemperation duct, and an outlet steam duct.
The main steam outlet of the boiler 1 can be selectively connected to the steam inlet of the high-pressure bypass temperature and pressure reducer 10 of the steam turbine, the steam outlet of the high-pressure bypass temperature and pressure reducer 10 of the steam turbine is connected with the reheat steam inlet of the boiler 1, and the reheat steam outlet of the boiler 1 is connected with the fused salt heat storage system and the steam inlet of the medium-pressure cylinder 2.2 of the steam turbine in parallel; the high-pressure bypass system of the steam turbine is started, and the reheat hot steam of the boiler 1 can be split into first reheat steam flowing into the molten salt heat storage system and second reheat steam flowing into the medium pressure cylinder 2.2 of the steam turbine by the aid of the boiler 1;
When the high-pressure bypass temperature and pressure reducer 10 of the steam turbine is put into operation, main steam at the outlet part of the boiler 1 is extracted, the main steam is connected to a steam exhaust pipeline of the boiler 1 through the high-pressure bypass temperature and pressure reducer 10 of the steam turbine to the high-pressure cylinder 2.1 of the steam turbine, and after being heated by a reheater of the boiler 1, the reheated hot steam at the outlet part of the boiler 1, namely, the first reheated steam, enters a fused salt heat storage system to heat fused salt.
The molten salt heat storage system comprises a low-temperature molten salt tank 11, a high-temperature molten salt tank 15, a water supply booster pump 20, a heat storage subsystem and an heat release subsystem;
The heat storage subsystem is used for exchanging heat between the heat of the first reheat steam and the low-temperature molten salt in the low-temperature molten salt tank 11 and storing the high-temperature molten salt after heat exchange in the high-temperature molten salt tank 15;
The fused salt used in the fused salt heat storage system is mixed fused salt with low melting point, wide temperature range and high decomposition temperature. For example, solar Salt (Solar molten Salt) can be used, the solidifying point is 220 ℃, and the upper limit is 600 ℃.
The heat release subsystem heats the feed water passing through the outlet of the deaerator 7 into superheated steam which can be sent into the steam inlet of the low-pressure cylinder 2.3 of the steam turbine by using the heat of the high-temperature molten salt in the high-temperature molten salt tank 15, and comprises a high-temperature molten salt pump 16, a molten salt-steam superheater 17, a molten salt-steam generator 18 and a molten salt-feed water preheater 19 which are connected in sequence;
The molten salt outlet of the high-temperature molten salt tank 15 is connected with the molten salt inlet of the molten salt-steam superheater 17 through the high-temperature molten salt pump 16; the molten salt outlet of the molten salt-steam superheater 17 is connected with the molten salt inlet of the molten salt-steam generator 18 through a pipeline; the molten salt outlet of the molten salt-steam generator 18 is connected with the molten salt inlet of the molten salt-water supply preheater 19; the molten salt outlet of the molten salt-water supply preheater 19 is connected with the molten salt inlet of the low-temperature molten salt tank 11;
The second water supply outlet of the deaerator 7 is connected with the water supply inlet of the molten salt-water supply preheater 19 through a water supply booster pump 20; a water supply outlet of the molten salt-water supply preheater 19 is connected with a water supply inlet of the molten salt-steam generator 18; the steam outlet of the fused salt-steam generator 18 is connected with the steam inlet of the fused salt-steam superheater 17; the steam outlet of the fused salt-steam superheater 17 is connected with the steam inlet of the low-pressure cylinder 2.3 of the steam turbine.
When the thermal power unit operates and peak regulation is not needed, exhaust steam of the middle pressure cylinder 2.2 of the steam turbine only enters the low pressure cylinder 2.3 of the steam turbine, and the outlet of the boiler 1 reheat hot steam only reaches the middle pressure cylinder 2.2 of the steam turbine; only when the thermal power generating unit participates in power grid peak regulation and needs to reduce the power generation output, the main steam of the boiler 1 can be split into a part to the high-pressure bypass temperature and pressure reducer 10 of the steam turbine, and the reheat hot steam of the cooperation boiler 1 can be split into a part to the heat storage subsystem; only when the thermal power generating unit participates in power grid peak regulation and needs to reduce the power generation output, a part of steam is shunted from a steam outlet of the fused salt-high temperature reheat steam cooler 14 and enters a low-pressure cylinder 2.3 of a steam turbine through a middle-low pressure cylinder communication pipe to do work and generate power; only when the power generation output is required to be increased when the thermal power generating unit participates in the power grid peak, the feed water at the outlet of the feed water booster pump 20 is heated into superheated steam through the molten salt-feed water preheater 19, the molten salt-steam generator 18 and the molten salt-steam superheater 17 in sequence, and the superheated steam enters the turbine low-pressure cylinder 2.3 through the medium-low-pressure cylinder communication pipe to do work and generate power.
When the thermal power generating unit participates in power grid peak regulation and needs to reduce power generation output, the boiler is kept to operate above the minimum steady burning load without oil feeding, the steam turbine is operated with the minimum steady burning load, redundant steam heat of the boiler is stored in the fused salt heat storage system, and the regulation target is as follows: the power generation load of the steam turbine generator unit is reduced under the condition of stable combustion of the boiler, so that the peak load regulation range of the unit is improved; when the power generation output is required to be increased when the thermal power generating unit participates in the peak of the power grid, the boiler operates between the lowest stable combustion load and the rated load, the high-temperature molten salt heats the water supply to generate superheated steam, and the superheated steam enters a low-pressure cylinder of the steam turbine to do work for power generation, and the regulation target is as follows: the change rate of the steam flow entering the low-pressure cylinder of the steam turbine can meet the speed requirement of quick load rising of the unit.
The heat storage subsystem comprises a low-temperature molten salt pump 12, a molten salt-low-temperature reheat steam cooler 13, a molten salt-high-temperature reheat steam cooler 14 and a reheat steam condenser 21. That is, the molten salt heat storage system comprises a low temperature molten salt tank 11, a low temperature molten salt pump 12, a molten salt-low temperature reheat steam cooler 13, a molten salt-high temperature reheat steam cooler 14, a high temperature molten salt tank 15, a high temperature molten salt pump 16, a molten salt-steam superheater 17, a molten salt-steam generator 18 and a molten salt-water preheater 19 which are sequentially connected, and further comprises a water supply booster pump 20 and a reheat steam condenser 21.
The molten salt outlet of the low-temperature molten salt tank 11 is connected with the molten salt inlet of the molten salt-low-temperature reheating steam cooler 13 through the low-temperature molten salt pump 12; the molten salt outlet of the molten salt-low temperature reheating steam cooler 13 is connected with the molten salt inlet of the molten salt-high temperature reheating steam cooler 14 through a pipeline; the molten salt outlet of the molten salt-high temperature reheating steam cooler 14 is connected with the molten salt inlet of the high temperature molten salt tank 15 through a pipeline; the molten salt outlet of the high-temperature molten salt tank 15 is connected with the molten salt inlet of the molten salt-steam superheater 17 through the high-temperature molten salt pump 16; the molten salt outlet of the molten salt-steam superheater 17 is connected with the molten salt inlet of the molten salt-steam generator 18 through a pipeline; the molten salt outlet of the molten salt-steam generator 18 is connected with the molten salt inlet of the molten salt-water supply preheater 19 through a pipeline; the molten salt outlet of the molten salt-water supply preheater 19 is connected with the molten salt inlet of the low-temperature molten salt tank 11 through a pipeline.
The molten salt outlet of the low-temperature molten salt tank 11 is connected with the molten salt inlet of the molten salt-low-temperature reheating steam cooler 13 through the low-temperature molten salt pump 12; the molten salt outlet of the molten salt-low temperature reheating steam cooler 13 is connected with the molten salt inlet of the molten salt-high temperature reheating steam cooler 14; the molten salt outlet of the molten salt-high temperature reheat steam cooler 14 is connected with the molten salt inlet of the high temperature molten salt tank 15.
The first reheat steam is connected with a steam inlet of the molten salt-low temperature reheat steam cooler 13 through a steam outlet of the molten salt-high temperature reheat steam cooler 14; the steam outlet of the fused salt-low temperature reheat steam cooler 13 is connected with the steam inlet of the reheat steam condenser 21; the drain outlet of the reheat steam condenser 21 is connected with the drain inlet of the deaerator 7 through a pipe.
The steam outlet of the fused salt-high temperature reheating steam cooler 14 is connected in parallel with the steam inlet of the fused salt-low temperature reheating steam cooler 13 and the steam inlet of the low pressure cylinder 2.3 of the steam turbine so that the steam at the output end of the fused salt-high temperature reheating steam cooler 14 is split into two parts of steam, wherein one part of steam is input into the low pressure cylinder 2.3 of the steam turbine, and the other part of steam sequentially passes through the fused salt-low temperature reheating steam cooler 13 and the reheating steam condenser 21.
The benefits of splitting the steam at the output of the molten salt-high temperature reheat steam cooler 14 into two parts of steam are: the inlet steam pipeline of the fused salt-low temperature reheating steam cooler 13 is provided with a regulating valve, and the opening of the regulating valve is controlled to regulate the steam quantity of the outlet steam of the fused salt-high temperature reheating steam cooler 14, which is shunted into the low-pressure cylinder 2.3 of the steam turbine, so as to regulate the steam flow and the acting force of the low-pressure cylinder of the steam turbine. Since the peak regulation capability of the unit will be weakened if all the steam at the outlet of the molten salt-high temperature reheat steam cooler 14 enters the turbine low pressure cylinder 2.3 to perform power generation, a small steam flow needs to be properly diverted to the molten salt-low temperature reheat steam cooler 13.
The steam outlet of the fused salt-high temperature reheating steam cooler 14, the steam outlet of the fused salt-steam superheater 17 and the steam outlet of the steam turbine intermediate pressure cylinder 2.2 are respectively connected to the steam inlet of the steam turbine low pressure cylinder 2.3.
Only when the thermal power generating unit participates in power grid peak regulation and needs to reduce the power generation output, part of steam at the steam outlet of the fused salt-high temperature reheat steam cooler 14 enters a low-pressure cylinder of a steam turbine through a medium-low pressure cylinder communication pipe to do work and generate power; only when the power generation output is required to be increased when the thermal power generating unit participates in the power grid peak, the feed water at the outlet of the feed water booster pump 20 is heated into superheated steam through the molten salt-feed water preheater 19, the molten salt-steam generator 18 and the molten salt-steam superheater 17 in sequence, and the superheated steam enters the turbine low-pressure cylinder 2.3 through the medium-low-pressure cylinder communication pipe to do work and generate power.
Extracting main steam at an outlet part of a boiler 1, heating the main steam through a steam turbine high-pressure bypass temperature-reducing pressure reducer 10 to a steam turbine high-pressure cylinder 2.1 steam exhaust pipeline by a boiler 1 reheater, sequentially feeding reheated hot steam at the outlet part of the boiler 1 into a fused salt-high temperature reheat steam cooler 14 and a fused salt-low temperature reheat steam cooler 13 to heat fused salt, sequentially heating the low-temperature fused salt in a low-temperature fused salt tank 11 into high-temperature fused salt through a low-temperature fused salt pump 12 by the fused salt-low temperature reheat steam cooler 13 and the high-temperature reheat steam cooler 14, and storing the high-temperature fused salt in a high-temperature fused salt tank 15, wherein the regulation targets are as follows: the power generation load of the steam turbine generator unit is reduced under the condition of stable combustion of the boiler 1, so that the peak load regulation range of the unit is improved.
When the thermal power generating unit participates in power grid peak regulation and needs to reduce the power generation output, the power generation output is reduced: the method comprises the steps of keeping the load of a boiler 1 not lower than the lowest stable combustion load without oil feeding, operating a steam turbine high-pressure bypass attemperator 10, a molten salt-high temperature reheat steam cooler 14, a molten salt-low temperature reheat steam cooler 13, a steam-water medium side system such as a reheat steam condenser 21 and the like, and a molten salt medium side system such as a low-temperature molten salt tank 11, a low-temperature molten salt pump 12, the molten salt-low temperature reheat steam cooler 13, the molten salt-high temperature reheat steam cooler 14 and the high-temperature molten salt tank 15, wherein part of main steam at a main steam outlet of the boiler 1 is connected to a steam turbine high-pressure cylinder 2.1 exhaust steam pipeline through the steam turbine high-pressure bypass attemperator 10, after being heated by the boiler 1 reheater, part of reheat steam at the reheat steam outlet of the boiler 1 is heated by the molten salt-low-temperature reheat steam cooler 13, the low-temperature molten salt in the low-temperature molten salt tank 11 is heated into high-temperature molten salt through the low-temperature molten salt pump 12, and the molten salt-low-high-temperature reheat steam cooler 14 is stored in the high-temperature molten salt tank 15 in sequence, and the aim is to: the power generation load of the steam turbine generator unit is reduced under the condition that the boiler 1 is stably combusted, so that the peak load regulation range of the unit is improved;
When the thermal power generating unit participates in the power grid peak and needs to increase the power generation output, the power generation output is increased: the boiler 1 operates between the lowest stable combustion load and rated load, and a shutdown thermal power generating unit participates in a system of power grid peak regulation, which needs to reduce the power generation output, and a high-temperature molten salt tank 15, a high-temperature molten salt pump 16, a molten salt-steam superheater 17, a molten salt-steam generator 18, a molten salt-water supply preheater 19 and other molten salt medium side systems, and a water supply booster pump 20, a molten salt-water supply preheater 19, a molten salt-steam generator 18, a molten salt-steam superheater 17 and other steam water medium side systems are put into operation. The high-temperature molten salt in the high-temperature molten salt tank 15 is cooled into low-temperature molten salt through a high-temperature molten salt pump 16 sequentially through a molten salt-steam superheater 17, a molten salt-steam generator 18 and a molten salt-water supply preheater 19, and then the low-temperature molten salt enters and is stored in the low-temperature molten salt tank. The feed water at the outlet of the feed water booster pump 20 is heated into new steam sequentially through a molten salt-feed water preheater 19, a molten salt-steam generator 18 and a molten salt-steam superheater 17, and the new steam enters a low-pressure cylinder 2.3 of a steam turbine through a medium-low pressure cylinder communication pipe to do work and generate power, and the regulation target is as follows: the change rate of the steam flow entering the low-pressure cylinder 2.3 of the steam turbine can meet the speed requirement of the quick load lifting of the unit, so that the quick load lifting capacity of the unit is improved. The method realizes the peak operation of the unit and the heat release function of the fused salt heat storage system, and simultaneously can ensure that the change rate of the steam flow entering the low-pressure cylinder of the steam turbine can meet the speed requirement of the quick load rising of the unit.
Preferably, regulating valves are respectively arranged on a steam inlet of the molten salt-high temperature reheating steam cooler 14 and a molten salt inlet of the molten salt-low temperature reheating steam cooler 13 so as to respectively regulate steam flow and outlet temperature of the molten salt-high temperature reheating steam cooler 14 and regulate molten salt flow and outlet temperature of the molten salt-low temperature reheating steam cooler 13.
Specifically, the steam inlet pipeline of the molten salt-high temperature reheating steam cooler 14 and the molten salt inlet pipeline of the molten salt-low temperature reheating steam cooler 13 are respectively provided with a regulating valve, and the steam flow and the outlet temperature of the molten salt-high temperature reheating steam cooler 14 and the molten salt flow and the outlet temperature of the molten salt-low temperature reheating steam cooler 13 are regulated by controlling the opening of the corresponding regulating valves, so that the system meets the requirements of reducing the power generation load of a turbo generator unit and meeting the speed of quick load reduction of the unit under the condition of stable combustion of the boiler 1.
Preferably, the molten salt inlet of the molten salt-steam superheater 17 and the water supply inlet of the molten salt-water supply preheater 19 are respectively provided with a regulating valve for respectively regulating the molten salt flow and the outlet temperature of the molten salt-steam superheater 17 and the water supply flow and the outlet temperature of the molten salt-water supply preheater 19.
Specifically, the molten salt inlet pipeline of the molten salt-steam superheater 17 and the water supply inlet pipeline of the molten salt-water supply preheater 19 are respectively provided with a regulating valve, and the molten salt flow and the outlet temperature of the molten salt-steam superheater 17 and the water supply flow and the outlet temperature of the molten salt-water supply preheater 19 are regulated by controlling the opening of the corresponding regulating valves, so that the change rate of the steam flow entering the low-pressure cylinder 2.3 of the steam turbine can meet the speed requirement of quick load rising of the unit.
Part of steam at the steam outlet of the fused salt-high temperature reheat steam cooler 14 enters a low-pressure cylinder 2.3 of a steam turbine to do work and generate power; a part of steam sequentially enters a fused salt-low temperature reheat steam cooler 13 and a reheat steam condenser 21 to heat fused salt and condensate respectively; the steam inlet of the fused salt-low temperature reheating steam cooler 13 is provided with a regulating valve for regulating the steam quantity of the steam outlet of the fused salt-high temperature reheating steam cooler 14, which is shunted into the low pressure cylinder 2.3 of the steam turbine. And then the steam flow and the acting force of the low-pressure cylinder of the steam turbine are regulated.
Preferably, the molten salt medium flow and the molten salt temperature of the molten salt heat storage system are regulated, and when the unit peak regulation is operated, a frequency converter can be configured through the low-temperature molten salt pump 12 to regulate the molten salt medium flow and the molten salt temperature; when the unit is in peak operation, a frequency converter can be configured through the high-temperature molten salt pump 16 to regulate the flow rate of molten salt medium and the temperature of molten salt.
Preferably, the sum of the steam flow rate of a part of the steam entering the low pressure cylinder 2.3 of the turbine and the steam flow rate of the exhaust steam entering the low pressure cylinder 2.3 of the turbine of the intermediate pressure cylinder 2.2, which are branched off from the steam outlet of the molten salt-high temperature reheat steam cooler 14, should not exceed the steam flow rate allowed by the low pressure cylinder 2.3 of the turbine.
Preferably, a steam turbine intermediate pressure combined steam valve is arranged on a steam inlet of the steam turbine intermediate pressure cylinder 2.2 and is used for increasing the steam pressure and flow rate of the first reheat steam.
Specifically, a steam inlet of the steam turbine intermediate pressure cylinder is provided with a steam turbine intermediate pressure combined steam valve, the steam turbine intermediate pressure combined steam valve can participate in regulation, the intermediate pressure combined steam valve participates in regulation, and the reheating cold steam pressure of the steam turbine high pressure cylinder 2.1 to the boiler 1 and the reheating hot steam pressure of the boiler 1 to the steam turbine intermediate pressure cylinder 2.2 are increased together. The reheat steam pressure and the inlet steam flow of the molten salt-high temperature reheat steam cooler 14 are moderately increased, so that the peak shaving load range and the machine furnace decoupling capacity of the unit are further improved. The medium-pressure combined steam valve participates in adjustment, so that the pressure of reheat steam can be increased, the specific volume of reheat steam can be reduced, and the steam circulation capacity of a pipeline can be increased.
Preferably, the thermal power generating set thermodynamic system further comprises a condenser 4, a condensate pump 5, a 4-level low-pressure heater 6.4, a 3-level low-pressure heater 6.3, a 2-level low-pressure heater 6.2, a 1-level low-pressure heater 6.1, a deaerator 7, a water supply pump 8, a 3-level high-pressure heater 9.3, a 2-level high-pressure heater 9.2 and a 1-level high-pressure heater 9.1;
The first steam extraction port of the low-pressure cylinder 2.3 of the steam turbine is connected with the steam inlet of the 2-stage low-pressure heater 6.2 through a pipeline; the second steam extraction port of the low-pressure cylinder 2.3 of the steam turbine is connected with the steam inlet of the 3-stage low-pressure heater 6.3 through a pipeline; the third steam extraction port of the low-pressure cylinder 2.3 of the steam turbine is connected with the steam inlet of the 4-stage low-pressure heater 6.4 through a pipeline; the steam outlet of the low-pressure cylinder 2.3 of the steam turbine is connected with the steam inlet of the condenser 4 through a pipeline; the condensate outlet of the condenser 4 is connected with the condensate inlet of the 4-stage low-pressure heater 6.4 and the condensate inlet of the reheat steam condenser 21 through a condensate pump 5; the condensate outlet of the 4-stage low-pressure heater 6.4 is connected with the condensate inlet of the 3-stage low-pressure heater 6.3 through a pipeline; the condensate outlet of the 3-stage low-pressure heater 6.3 is connected with the condensate inlet of the 2-stage low-pressure heater 6.2 through a pipeline; the condensate outlet of the 2-stage low-pressure heater 6.2 is connected with the condensate inlet of the 1-stage low-pressure heater 6.1 through a pipeline; the condensate outlet of the 1-stage low-pressure heater 6.1 and the condensate outlet of the reheat steam condenser 21 are connected with the condensate inlet of the deaerator 7 through pipelines; the first water supply outlet of the deaerator 7 is connected with a water supply inlet of the 3-stage high-pressure heater 9.3 and a temperature and water reduction inlet of the high-pressure bypass temperature and pressure reduction device 10 of the steam turbine through a water supply pump 8; the water supply outlet of the 3-stage high-pressure heater 9.3 is connected with the water supply inlet of the 2-stage high-pressure heater 9.2 through a pipeline; the water supply outlet of the level 2 high-pressure heater 9.2 is connected with the water supply inlet of the level 1 high-pressure heater 9.1 through a pipeline; the water supply outlet of the 1 st stage high pressure heater 9.1 is connected with the water supply inlet of the boiler 1 through a pipeline.
The main steam outlet of the boiler 1 is connected with the steam inlet of the high-pressure cylinder 2.1 of the steam turbine and the steam inlet of the high-pressure bypass temperature and pressure reducer 10 of the steam turbine through pipelines; the steam outlet of the high-pressure cylinder 2.1 of the steam turbine is connected with a reheat steam inlet of the boiler 1, a steam inlet of the 2-stage high-pressure heater 9.2 and a steam outlet of the high-pressure bypass temperature and pressure reducer 10 of the steam turbine through pipelines; the first steam extraction port of the high-pressure cylinder 2.1 of the steam turbine is connected with the steam inlet of the high-pressure heater 9.1 of level 1 through a pipeline; the reheat steam outlet of the boiler 1 is connected with the steam inlet of the middle pressure cylinder 2.2 of the steam turbine and the steam inlet of the fused salt-high temperature reheat steam cooler 14 through pipelines; the high-pressure cylinder 2.1, the middle-pressure cylinder 2.2 and the low-pressure cylinder 2.3 are connected with the generator 3, and the high-pressure cylinder 2.1, the middle-pressure cylinder 2.2 and the low-pressure cylinder 2.3 jointly drive the generator 3 to generate electricity; the first steam extraction port of the middle pressure cylinder 2.2 of the steam turbine is connected with the steam inlet of the 3-stage high-pressure heater 9.3 through a pipeline; the second steam extraction port of the middle pressure cylinder 2.2 of the steam turbine is connected with the steam inlet of the deaerator 7 through a pipeline; the third steam extraction port of the middle pressure cylinder 2.2 of the steam turbine is connected with the steam inlet of the 1-stage low pressure heater 6.1 through a pipeline; the steam outlet of the middle pressure cylinder 2.2 of the steam turbine is connected with the steam inlet of the low pressure cylinder 2.3 of the steam turbine, the steam outlet of the fused salt-high temperature reheat steam cooler 14, the steam outlet of the fused salt-steam superheater 17 and the steam inlet of the fused salt-low temperature reheat steam cooler 13 through pipelines; the first steam extraction port of the low-pressure cylinder 2.3 of the steam turbine is connected with the steam inlet of the 2-stage low-pressure heater 6.2 through a pipeline; the second steam extraction port of the low-pressure cylinder 2.3 of the steam turbine is connected with the steam inlet of the 3-stage low-pressure heater 6.3 through a pipeline; the third steam extraction port of the low-pressure cylinder 2.3 of the steam turbine is connected with the steam inlet of the 4-stage low-pressure heater 6.4 through a pipeline; the steam outlet of the low-pressure cylinder 2.3 of the steam turbine is connected with the steam inlet of the condenser 4 through a pipeline; the condensate outlet of the condenser 4 is connected with the condensate inlet of the 4-stage low-pressure heater 6.4 and the condensate inlet of the reheat steam condenser 21 through a condensate pump 5; the condensate outlet of the 4-stage low-pressure heater 6.4 is connected with the condensate inlet of the 3-stage low-pressure heater 6.3 through a pipeline; the condensate outlet of the 3-stage low-pressure heater 6.3 is connected with the condensate inlet of the 2-stage low-pressure heater 6.2 through a pipeline; the condensate outlet of the 2-stage low-pressure heater 6.2 is connected with the condensate inlet of the 1-stage low-pressure heater 6.1 through a pipeline; the condensate outlet of the 1-stage low-pressure heater 6.1 and the condensate outlet of the reheat steam condenser 21 are connected with the condensate inlet of the deaerator 7 through pipelines; the first water supply outlet of the deaerator 7 is connected with a water supply inlet of the 3-stage high-pressure heater 9.3 and a temperature and water reduction inlet of the high-pressure bypass temperature and pressure reduction device 10 of the steam turbine through a water supply pump 8; the second water supply outlet of the deaerator 7 is connected with the water supply inlet of the molten salt-water supply preheater 19 through a water supply booster pump 20; the water supply outlet of the 3-stage high-pressure heater 9.3 is connected with the water supply inlet of the 2-stage high-pressure heater 9.2 through a pipeline; the water supply outlet of the level 2 high-pressure heater 9.2 is connected with the water supply inlet of the level 1 high-pressure heater 9.1 through a pipeline; the water supply outlet of the 1-stage high-pressure heater 9.1 is connected with the water supply inlet of the boiler 1 through a pipeline; the water supply outlet of the molten salt-water supply preheater 19 is connected with the water supply inlet of the molten salt-steam generator 18 through a pipeline; the steam outlet of the fused salt-steam generator 18 is connected with the steam inlet of the fused salt-steam superheater 17 through a pipeline; the steam outlet of the fused salt-steam superheater 17 is connected with the steam inlet of the low-pressure cylinder 2.3 of the steam turbine, the steam outlet of the medium-pressure cylinder 2.2 of the steam turbine, the steam outlet of the fused salt-high temperature reheating steam cooler 14 and the steam inlet of the fused salt-low temperature reheating steam cooler 13 through pipelines; the steam outlet of the fused salt-high temperature reheating steam cooler 14 is connected with the steam inlet of the low pressure cylinder 2.3 of the steam turbine, the steam outlet of the medium pressure cylinder 2.2 of the steam turbine, the steam inlet of the fused salt-low temperature reheating steam cooler 13 and the steam outlet of the fused salt-steam superheater 17 through pipelines; the steam outlet of the fused salt-low temperature reheat steam cooler 13 is connected with the steam inlet of the reheat steam condenser 21 through a pipeline; the drain outlet of the reheat steam condenser 21 is connected with the drain inlet of the deaerator 7 through a pipe.
The reason why the steam outlet of the intermediate pressure cylinder 2.2 of the steam turbine is connected with the steam outlet of the fused salt-high temperature reheat steam cooler 14 and the steam inlet of the fused salt-low temperature reheat steam cooler 13 through pipelines is that: when the thermal power generating unit participates in power grid peak regulation and needs to reduce the power generation output, part of steam at the steam outlet of the fused salt-high temperature reheat steam cooler 14 enters a low-pressure cylinder 2.3 of a steam turbine through a middle-low pressure cylinder communication pipe to do work and generate power; the other part of steam sequentially enters the fused salt-low temperature reheating steam cooler 13 and the reheating steam condenser 21 to heat fused salt and condensate respectively, an inlet steam pipeline of the fused salt-low temperature reheating steam cooler 13 is provided with a regulating valve, and the opening of the regulating valve is controlled to regulate the steam quantity of the outlet steam of the fused salt-high temperature reheating steam cooler 14, which is shunted into the low-pressure cylinder 2.3 of the steam turbine, so that the steam flow and the acting output of the low-pressure cylinder are regulated.
The pipe section between the steam outlet of the middle pressure cylinder 2.2 of the steam turbine and the steam inlet of the low pressure cylinder 2.3 of the steam turbine is called a middle and low pressure cylinder communication pipe, a part of steam at the steam outlet of the fused salt-high temperature reheat steam cooler 14 is communicated to the middle and low pressure cylinder communication pipe, and steam output from the steam outlet of the fused salt-steam superheater 17 is also communicated to the middle and low pressure cylinder communication pipe.
The outlet condensate of the 4-stage low-pressure heater 6.4, the outlet condensate of the 3-stage low-pressure heater 6.3 and the outlet condensate of the 2-stage low-pressure heater 6.2 can be respectively connected with the condensate inlet of the reheat steam condenser 21.
While certain exemplary embodiments of the present utility model have been described above by way of illustration only, it will be apparent to those of ordinary skill in the art that modifications may be made to the described embodiments in various different ways without departing from the spirit and scope of the utility model. Accordingly, the drawings and description are to be regarded as illustrative in nature and not as restrictive of the scope of the utility model, which is defined by the appended claims.
Claims (8)
1. The molten salt heat storage system capable of realizing decoupling of the machine furnace is characterized by comprising a thermal power generation unit thermodynamic system, a turbine high-pressure bypass system and a molten salt heat storage system:
The thermal power generating unit thermodynamic system for generating electricity comprises a generator (3), a deaerator (7), a boiler (1), a turbine high-pressure cylinder (2.1), a turbine medium-pressure cylinder (2.2) and a turbine low-pressure cylinder (2.3);
The turbine high-pressure bypass system capable of being opened or closed comprises a turbine high-pressure bypass temperature and pressure reducer (10);
The main steam outlet of the boiler (1) can be selectively connected to the steam inlet of a high-pressure bypass temperature and pressure reducer (10) of a steam turbine, and the steam outlet of the high-pressure bypass temperature and pressure reducer (10) of the steam turbine is connected to the reheat steam inlet of the boiler (1); the reheat steam outlet of the boiler (1) is connected with the molten salt heat storage system and the turbine intermediate pressure cylinder (2.2) in parallel, and the reheat hot steam of the boiler (1) can be split into first reheat steam flowing into the molten salt heat storage system and second reheat steam flowing into the turbine intermediate pressure cylinder (2.2) when the turbine high pressure bypass system is started;
The steam outlet of the high-pressure cylinder (2.1) of the steam turbine is connected with a reheat steam inlet of the boiler (1) and a steam outlet of a high-pressure bypass temperature and pressure reducer (10) of the steam turbine through pipelines;
The molten salt heat storage system comprises a low-temperature molten salt tank (11), a high-temperature molten salt tank (15), a water supply booster pump (20), a heat storage subsystem and an heat release subsystem;
The heat storage subsystem is used for exchanging heat between the heat of the first reheat steam and molten salt in the low-temperature molten salt tank (11) and storing the molten salt after heat exchange into the high-temperature molten salt tank (15);
The heat release subsystem heats feed water passing through the outlet of the deaerator (7) into superheated steam capable of being fed into the steam inlet of the low-pressure cylinder (2.3) of the steam turbine by using the heat of molten salt in the high-temperature molten salt tank (15), and the heat release subsystem comprises a high-temperature molten salt pump (16), a molten salt-steam superheater (17), a molten salt-steam generator (18) and a molten salt-feed water preheater (19) which are connected in sequence;
The molten salt outlet of the high-temperature molten salt tank (15) is connected with the molten salt inlet of the molten salt-steam superheater (17) through a high-temperature molten salt pump (16); the molten salt outlet of the molten salt-steam superheater (17) is connected with the molten salt inlet of the molten salt-steam generator (18); the molten salt outlet of the molten salt-steam generator (18) is connected with the molten salt inlet of the molten salt-water supply preheater (19); the molten salt outlet of the molten salt-water supply preheater (19) is connected with the molten salt inlet of the low-temperature molten salt tank (11);
The second water supply outlet of the deaerator (7) is connected with the water supply inlet of the molten salt-water supply preheater (19) through the water supply booster pump (20); a water supply outlet of the molten salt-water supply preheater (19) is connected with a water supply inlet of the molten salt-steam generator (18); a steam outlet of the fused salt-steam generator (18) is connected with a steam inlet of the fused salt-steam superheater (17); the steam outlet of the fused salt-steam superheater (17) is connected with the steam inlet of the low-pressure cylinder (2.3) of the steam turbine;
The heat storage subsystem comprises a low-temperature molten salt pump (12), a molten salt-low-temperature reheat steam cooler (13), a molten salt-high-temperature reheat steam cooler (14) and a reheat steam condenser (21);
The molten salt outlet of the low-temperature molten salt tank (11) is connected with the molten salt inlet of the molten salt-low-temperature reheating steam cooler (13) through the low-temperature molten salt pump (12); the molten salt outlet of the molten salt-low temperature reheating steam cooler (13) is connected with the molten salt inlet of the molten salt-high temperature reheating steam cooler (14); the molten salt outlet of the molten salt-high temperature reheating steam cooler (14) is connected with the molten salt inlet of the high temperature molten salt tank (15);
The first reheat steam is connected with a steam inlet of the fused salt-low temperature reheat steam cooler (13) through a steam outlet of the fused salt-high temperature reheat steam cooler (14); a steam outlet of the fused salt-low temperature reheating steam cooler (13) is connected with a steam inlet of the reheating steam condenser (21); the drain outlet of the reheat steam condenser (21) is connected with the drain inlet of the deaerator (7) through a pipeline;
The steam outlet of the fused salt-high temperature reheating steam cooler (14) is connected in parallel with the steam inlet of the fused salt-low temperature reheating steam cooler (13) and the steam inlet of the low-pressure cylinder (2.3) of the steam turbine so that the steam at the output end of the fused salt-high temperature reheating steam cooler (14) is split into two parts of steam, wherein one part of steam is input into the low-pressure cylinder (2.3) of the steam turbine, and the other part of steam sequentially passes through the fused salt-low temperature reheating steam cooler (13) and the reheating steam condenser (21);
The steam outlet of the fused salt-high temperature reheating steam cooler (14), the steam outlet of the fused salt-steam superheater (17) and the steam outlet of the middle pressure cylinder (2.2) of the steam turbine are respectively connected to the steam inlet of the low pressure cylinder (2.3) of the steam turbine.
2. The molten salt heat storage system capable of realizing machine furnace decoupling according to claim 1, wherein a steam inlet of the molten salt-high temperature reheating steam cooler (14) and a molten salt inlet of the molten salt-low temperature reheating steam cooler (13) are respectively provided with a regulating valve so as to respectively regulate steam flow and outlet temperature of the molten salt-high temperature reheating steam cooler (14) and regulate molten salt flow and outlet temperature of the molten salt-low temperature reheating steam cooler (13).
3. The molten salt heat storage system capable of realizing machine furnace decoupling according to claim 1, wherein the molten salt inlet of the molten salt-steam superheater (17) and the water supply inlet of the molten salt-water supply preheater (19) are respectively provided with regulating valves for respectively regulating the molten salt flow and the outlet temperature of the molten salt-steam superheater (17) and regulating the water supply flow and the outlet temperature of the molten salt-water supply preheater (19).
4. The molten salt heat storage system capable of realizing machine furnace decoupling according to claim 1, wherein part of steam at a steam outlet of the molten salt-high temperature reheat steam cooler (14) enters a low pressure cylinder (2.3) of a steam turbine to perform work and generate electricity; the other part of steam sequentially enters a fused salt-low temperature reheat steam cooler (13) and a reheat steam condenser (21) to heat fused salt and condensate respectively; the steam inlet of the fused salt-low temperature reheating steam cooler (13) is provided with a regulating valve for regulating the steam flow of the steam outlet of the fused salt-high temperature reheating steam cooler (14) which is shunted into the low-pressure cylinder (2.3) of the steam turbine.
5. A molten salt heat storage system capable of realizing decoupling of a machine furnace according to claim 1, wherein the sum of the steam flow of a part of steam entering a low pressure cylinder (2.3) of a steam turbine and the steam flow of the steam discharged from a medium pressure cylinder (2.2) of the steam turbine entering the low pressure cylinder (2.3) of the steam turbine, which are branched from a steam outlet of the molten salt-high temperature reheat steam cooler (14), should not exceed the allowable steam flow of the low pressure cylinder (2.3) of the steam turbine.
6. The molten salt heat storage system capable of realizing machine furnace decoupling according to claim 1, wherein a steam inlet of a steam turbine intermediate pressure cylinder (2.2) is provided with a steam turbine intermediate pressure combined steam valve for increasing the steam pressure and flow of first reheat steam.
7. The molten salt heat storage system capable of realizing machine furnace decoupling according to claim 1, wherein the thermal power generating set thermodynamic system further comprises a condenser (4), a condensate pump (5), a 4-stage low-pressure heater (6.4), a 3-stage low-pressure heater (6.3), a 2-stage low-pressure heater (6.2), a 1-stage low-pressure heater (6.1), a water supply pump (8), a 3-stage high-pressure heater (9.3), a 2-stage high-pressure heater (9.2) and a 1-stage high-pressure heater (9.1);
The first steam extraction port of the low-pressure cylinder (2.3) of the steam turbine is connected with the steam inlet of the 2-stage low-pressure heater (6.2) through a pipeline; the second steam extraction port of the low-pressure cylinder (2.3) of the steam turbine is connected with the steam inlet of the 3-stage low-pressure heater (6.3) through a pipeline; the third steam extraction port of the low-pressure cylinder (2.3) of the steam turbine is connected with the steam inlet of the 4-stage low-pressure heater (6.4) through a pipeline; the steam outlet of the low-pressure cylinder (2.3) of the steam turbine is connected with the steam inlet of the condenser (4) through a pipeline; the condensed water outlet of the condenser (4) is connected with the condensed water inlet of the 4-level low-pressure heater (6.4) and the condensed water inlet of the reheat steam condenser (21) through a condensed water pump (5); the condensate outlet of the 4-stage low-pressure heater (6.4) is connected with the condensate inlet of the 3-stage low-pressure heater (6.3) through a pipeline; the condensate outlet of the 3-stage low-pressure heater (6.3) is connected with the condensate inlet of the 2-stage low-pressure heater (6.2) through a pipeline; the condensed water outlet of the 2-level low-pressure heater (6.2) is connected with the condensed water inlet of the 1-level low-pressure heater (6.1) through a pipeline; the condensate outlet of the 1-level low-pressure heater (6.1) and the condensate outlet of the reheat steam condenser (21) are connected with the condensate inlet of the deaerator (7) through pipelines; the first water supply outlet of the deaerator (7) is connected with a water supply inlet of the 3-stage high-pressure heater (9.3) and a temperature-reducing water inlet of the high-pressure bypass temperature-reducing pressure reducer (10) of the steam turbine through a water supply pump (8); the water supply outlet of the 3-level high-pressure heater (9.3) is connected with the water supply inlet of the 2-level high-pressure heater (9.2) through a pipeline; the water supply outlet of the level 2 high-pressure heater (9.2) is connected with the water supply inlet of the level 1 high-pressure heater (9.1) through a pipeline; the water supply outlet of the 1-level high-pressure heater (9.1) is connected with the water supply inlet of the boiler (1) through a pipeline.
8. The molten salt heat storage system capable of realizing machine furnace decoupling according to claim 7, wherein the outlet condensate of the 4-stage low-pressure heater (6.4), the outlet condensate of the 3-stage low-pressure heater (6.3) and the outlet condensate of the 2-stage low-pressure heater (6.2) can be respectively connected with the condensate inlet of the reheat steam condenser (21).
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| CN118328366A (en) * | 2024-05-08 | 2024-07-12 | 国网河北能源技术服务有限公司 | Reheat steam hierarchical regulation type power station deep peak regulation heat storage and release system and method |
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| CN118328366A (en) * | 2024-05-08 | 2024-07-12 | 国网河北能源技术服务有限公司 | Reheat steam hierarchical regulation type power station deep peak regulation heat storage and release system and method |
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