CN212003284U - A thermal power unit molten salt cascade storage and discharge energy peak regulation system - Google Patents

Abstract

The utility model relates to the technical field of molten salt storage tanks, in particular to a thermal power generation unit with a molten salt cascade storage and discharge energy peak regulation system, comprising a thermal power unit and a molten salt cascade energy storage and release system. The thermal power unit includes a boiler, a main steam turbine and a condenser , condensate pump, feed pump, heat recovery system, feed pump small steam turbine, auxiliary steam pipeline, induced draft fan small steam turbine and flue air system; molten salt cascade energy storage and release system includes high temperature steam-molten salt heat exchanger group, low temperature steam- Molten salt heat exchanger group, high temperature molten salt-steam heat exchanger group, low temperature molten salt-steam heat exchanger group, high temperature hot molten salt tank, low temperature hot molten salt tank, cold molten salt tank. The utility model can improve energy utilization rate, save cost, complete system, high reliability, flexibility and high safety.

Description

A thermal power unit molten salt cascade storage and discharge energy peak regulation system

technical field

The utility model relates to the technical field of molten salt energy storage, in particular to a molten salt cascade storage and discharge energy peak regulation system for thermal power units.

Background technique

The energy revolution aims to promote the sustainable development of energy, the development of new energy and the clean and efficient use of fossil energy. The rapid increase in the amount of new energy has forced the load rate of traditional thermal power units to decrease. Most of the units run at a non-full load state for a long time, and a few are even shut down, resulting in a waste of resources that have been put into production; The reduction of the overall load demand makes the load of the unit further reduce during the valley power period, which is close to the minimum steady load of the thermal power unit. These changes will lead to low utilization rate of thermal power units that have been put into production, low power generation efficiency, increased equivalent pollutant emissions, greatly reduced safety, reliability and economy, which are not in line with the sustainable development of the energy revolution. Therefore, the development of new deep peak shaving systems and technologies is imminent.

Energy storage technology can play a major role in the field of deep peak regulation and is one of the cores of sustainable energy development. Applying it to the peak shaving system of thermal power units can greatly increase the minimum load of the unit; it can enhance the heating capacity of the unit during the period of high load, or further ensure the power supply during the period of high load demand of the power grid. Therefore, the application of energy storage technology to thermal power units is conducive to improving the utilization rate of unit equipment, power generation efficiency, safety, reliability and economy, reducing pollutant emissions, and conforming to the purpose of sustainable development of the energy revolution.

The molten salt energy storage power supply and heating technology has been used commercially, such as successfully applied in solar thermal power plants, with the advantages of mature technology and relatively low cost. It is technically and economically feasible to apply it to thermal power units to participate in peak-shaving power supply and heating.

At present, there is a technical solution for the application of molten salt energy storage technology in the field of power generation, that is, the use of photovoltaic and wind power abandoned electricity to heat molten salt, and the heat stored in molten salt is used to heat water vapor or helium and other working fluids to drive turbines when needed. generate electricity. This technical solution can be transplanted to the thermal power generation field to participate in deep peak shaving, but its efficiency is only about 15% due to the electricity, heat, electricity conversion process and one heat exchange process, and the economy is very poor; The technology of molten salt energy storage applied in the field of thermal power generation is the single-stage utilization of molten salt energy storage, that is, the heat is indirectly or directly absorbed from the steam-water system of the thermal power unit and stored in the molten salt, and the molten salt releases heat to the unit heat-consuming users when needed. Or to the newly built energy storage steam turbine for power generation or to the heating system for heating. Compared with the above-mentioned technical solutions for electricity, heat and circuit lines, this technical solution has improved economy, but this technical solution has obvious shortcomings: ① The high-parameter steam (up to 550°C) heated by the high-temperature hot molten salt directly heats the working fluid with lower parameters, such as the working fluid at the cold end of the heat network, the auxiliary steam used for the shaft seal, and the primary and secondary air of the boiler, etc. The heat transfer temperature difference is large, and the loss is large; ②The investment in the newly built steam turbine for energy storage is large; ③The freezing point of molten salt is high. For example, in order to maintain the flow of binary molten salt in a solar thermal power station, the temperature of the cold end of the molten salt needs to be high. At 280 °C, therefore, the parameters of the steam extracted from the steam-water system of the unit are still high (the temperature can reach above 300 °C) after the heat is released to the molten salt, and there is still a high energy value that is not used.

Therefore, under the background of the participation of thermal power units in the whole network in peak regulation, in order to solve the problem of low load or even minimum stable load operation of thermal power units caused by low load requirements of the power grid and peak-to-valley difference, it is urgent to develop a more efficient coupled thermal power unit. Molten salt energy storage peak-shaving power supply and heating system.

Utility model content

The utility model solves the problem of large energy loss caused by single-stage utilization of molten salt energy storage systems in the related art, and proposes a molten salt cascade storage and discharge energy peak regulation system for thermal power units.

In order to solve the above-mentioned technical problems, the utility model is realized through the following technical solutions: a thermal power unit molten salt cascade storage and discharge energy peak regulation system, comprising:

A thermal power unit, the thermal power unit includes a boiler, a main steam turbine, a condenser, a condensate pump, a feed pump, a heat recovery system, a small steam turbine for the feed pump, an auxiliary steam pipeline, a small steam turbine for an induced draft fan, and a flue gas system, and the boiler passes through the steam The pipeline is connected to the main steam turbine, outputs the main steam to the main steam turbine, and heats the low-temperature reheated steam from the main steam turbine to the high-temperature reheated steam and returns it to the main steam turbine; the main steam turbine is connected to the regenerative system, and part of the steam is pumped to the regenerative heat The system is recycled; the boiler is connected to the heat recovery system through the water supply pipeline, and the boiler is connected to the smoke air system through the primary air duct, the air supply duct and the flue;

A molten salt cascade energy storage and release system, the molten salt cascade energy storage and release system includes a high temperature steam-molten salt heat exchanger group, a low temperature steam-molten salt heat exchanger group, a high temperature molten salt-steam heat exchanger group, a low temperature molten salt heat exchanger group Salt-steam heat exchanger group, high temperature hot molten salt tank, low temperature hot molten salt tank, cold molten salt tank;

The molten salt side of the high temperature steam-molten salt heat exchanger group is connected with the high temperature hot molten salt tank, the low temperature hot molten salt tank and the cold molten salt tank; the steam side of the high temperature steam-molten salt heat exchanger group is connected with the boiler to the main The steam turbine steam pipeline, heat recovery system, auxiliary steam pipeline, heating system, and flue gas system are connected, and the heat of the steam from the boiler to the main steam turbine steam pipeline is released to the cold molten salt pumped from the cold molten salt tank, making it a The hot molten salt is stored in the high temperature hot molten salt tank and the low temperature hot molten salt tank according to the temperature of the hot molten salt. wind system;

The molten salt side of the low temperature steam-molten salt heat exchanger group is connected with the low temperature hot molten salt tank and the cold molten salt tank; the steam side of the low temperature steam-molten salt heat exchanger group is connected with the main steam turbine to the boiler steam pipeline, the main steam turbine The steam extraction pipeline, the heat recovery system, the auxiliary steam pipeline, the heating system and the flue gas system are connected, and the heat of the steam from the main steam turbine to the boiler steam pipeline or the main steam turbine extraction pipeline is released to the cold molten salt pumped from the cold molten salt tank. Salt, making it a low-temperature hot-melt salt, and stored in a low-temperature hot-melt salt tank, the steam after heat release is used for the heat recovery system, auxiliary steam pipeline, heating system, and flue gas system in a cascade according to its parameter characteristics;

The molten salt side of the high temperature molten salt-steam heat exchanger group is connected to the high temperature hot molten salt tank, the low temperature hot molten salt tank and the cold molten salt tank; the steam side of the high temperature molten salt-steam heat exchanger group is connected to the main steam turbine pumping unit. The steam pipeline, the heat recovery system, the heating system, the small steam turbine of the feed pump, and the small steam turbine of the induced draft fan are connected, and the heat stored in the high-temperature molten salt in the high-temperature molten salt tank is released to the steam from the steam extraction pipeline of the independent steam turbine, and its parameters are improved. , and is used in the heat recovery system, the heating system, the small steam turbine of the feed pump, the small steam turbine of the induced draft fan, and the molten salt after heat release is stored in the low-temperature hot molten salt tank or cold molten salt tank according to its temperature cascade;

The molten salt side of the low temperature molten salt-steam heat exchanger group is connected with the low temperature hot molten salt tank and the cold molten salt tank; The heat supply system, auxiliary steam pipeline and flue gas system are connected, and the heat stored in the low-temperature molten salt tank is released to the steam from the extraction pipeline of the autonomous steam turbine, and its parameters are improved. In the regenerative system, heating system, auxiliary steam pipeline, and flue gas system, the molten salt after heat release is stored in the cold molten salt tank.

As a preferred solution, the high-temperature steam-molten salt heat exchanger group may be one heat exchanger, or multiple heat exchangers may be connected in series or in parallel; the low-temperature steam-molten salt heat exchanger group may be one heat exchanger It can also be multiple heat exchangers in series or parallel; the high temperature molten salt-steam heat exchanger group can be one heat exchanger, or multiple heat exchangers in series or parallel; the low temperature molten salt-steam heat exchanger group can be The steam heat exchanger group can be one heat exchanger, or a plurality of heat exchangers can be connected in series or in parallel.

As a preferred solution, the heat recovery system includes a low-pressure heater module, a deaerator, and a high-pressure heater module connected in sequence, and a condenser and a condensate water pump are sequentially connected between the main steam turbine and the low-pressure heater module; the A feed water pump is connected between the deaerator and the high-pressure heater module, and the feed water pump is driven by a small steam turbine of the feed water pump, and the small steam turbine of the feed water pump is connected to the steam side of the high-temperature molten salt-steam heat exchanger group; the high-pressure heating The heater module is connected to the economizer of the boiler through the water supply pipeline, and the low-pressure heater module and the deaerator are connected to the steam side of the high temperature steam-molten salt heat exchanger group and the low temperature steam-molten salt heat exchanger group respectively; The high-pressure heater modules are respectively connected to the steam side of the high-temperature steam-molten salt heat exchanger group, the low-temperature steam-molten salt heat exchanger group, the high-temperature molten salt-steam heat exchanger group, and the low-temperature molten salt-steam heat exchanger group. connected.

As a preferred solution, the flue gas system includes a flue gas system and an air system, and the flue gas system is sequentially connected to a dust collector, an induced draft fan, a desulfurization tower, a flue gas heater and a chimney through the flue after the air preheater of the boiler. The induced draft fan is driven by a small induced draft fan turbine, which is connected to the steam side of the high-temperature molten salt-steam heat exchanger group; the wind system includes a primary air heater, a supply air heater, a primary fan, and a supply fan The primary fan and the blower are connected to the primary air heater and the air supply heater respectively through the primary air duct and the air supply duct, and then connected to the boiler through the primary air duct and the air supply duct. The primary air heater, The supply air heater and the flue gas heater are respectively connected to the steam side of the high-temperature steam-molten salt heat exchanger group, the low-temperature steam-molten salt heat exchanger group, and the low-temperature molten salt-steam heat exchanger group.

As a preferred solution, the thermal power unit includes a non-reheat unit, a primary reheat unit, and a secondary reheat unit.

As a preferred solution, when the thermal power unit is a non-reheat unit, the main steam turbine includes a main steam turbine high-pressure cylinder and a main steam turbine low-pressure cylinder, and the main steam turbine high-pressure cylinder is connected to the superheater of the boiler through a main steam pipeline; the high temperature The steam side of the steam-molten salt heat exchanger group is connected to the main steam pipeline, and the heat of the steam from the main steam pipeline is released to the cold molten salt pumped from the cold molten salt tank; the low-temperature steam-molten salt heat exchanger group steam The side is connected to the steam extraction pipeline of the high-pressure cylinder of the main steam turbine, and the heat of the steam of the extraction pipeline of the high-pressure cylinder of the main steam turbine is released to the cold molten salt pumped from the cold molten salt tank; the steam side of the high-temperature molten salt-steam heat exchanger group It is connected with the steam extraction pipeline of the low-pressure cylinder of the main steam turbine, and releases the heat stored in the high-temperature molten salt tank to the steam from the extraction pipeline of the low-pressure cylinder of the main steam turbine; the steam of the low-temperature molten salt-steam heat exchanger group The side is connected to the steam extraction pipeline of the low-pressure cylinder of the main steam turbine, and the heat stored in the low-temperature hot-molten salt tank is released to the steam from the extraction pipeline of the low-pressure cylinder of the main steam turbine; the low-pressure cylinder of the main steam turbine is connected to the condenser .

As a preferred solution, when the thermal power unit is a primary reheat unit, the main steam turbine includes a main steam turbine high pressure cylinder, a main steam turbine medium pressure cylinder and a main steam turbine low pressure cylinder, and the main steam turbine high pressure cylinder passes through the main steam pipeline and the low temperature reheating cylinder respectively. The hot steam pipeline is connected with the superheater of the boiler and the primary reheater; the primary reheater is then connected with the medium pressure cylinder of the main steam turbine through the high temperature reheat steam pipeline; the steam side of the high temperature steam-molten salt heat exchanger group is connected with the main steam turbine. The main steam pipeline is connected with the high-temperature reheated steam pipeline, and the heat of the steam from the main steam pipeline or the high-temperature reheated steam pipeline is released to the cold molten salt pumped from the cold molten salt tank; the steam of the low-temperature steam-molten salt heat exchanger group The side is connected to the low temperature reheat steam pipeline and the extraction pipeline of the high pressure cylinder of the main steam turbine, and the heat from the low temperature reheat steam pipeline or the extraction pipeline of the main steam turbine high pressure cylinder is released to the cold molten salt pumped from the cold molten salt tank; The steam side of the high-temperature molten salt-steam heat exchanger group is connected to the steam extraction pipeline of the medium-pressure cylinder of the main steam turbine and the extraction steam pipeline of the low-pressure cylinder of the main steam turbine, and releases the heat stored in the high-temperature molten salt tank to the Steam from the steam extraction pipeline of the intermediate pressure cylinder of the main steam turbine or the extraction steam pipeline of the low pressure cylinder of the main steam turbine; The steam pipes are connected to each other, and the heat stored in the low-temperature hot-melt salt tank is released to the steam from the extraction pipe of the medium-pressure cylinder of the main steam turbine or the extraction pipe of the low-pressure cylinder of the main steam turbine; the low-pressure cylinder of the main steam turbine and the condenser connected.

As a preferred solution, when the thermal power unit is a secondary reheat unit, the main steam turbine includes a main steam turbine ultra-high pressure cylinder, a main steam turbine high pressure cylinder, a main steam turbine medium pressure cylinder and a main steam turbine low pressure cylinder, and the main steam turbine ultra-high pressure cylinder The main steam turbine is connected to the superheater and the primary reheater of the boiler through the main steam pipeline and the primary low temperature reheat steam pipeline respectively; The reheater and the secondary reheater are connected; the middle pressure cylinder of the main steam turbine is connected to the secondary reheater of the boiler through the secondary high temperature reheat steam pipeline; the steam side of the high temperature steam-molten salt heat exchanger group is connected to the secondary reheater of the boiler. The main steam pipeline, the primary high temperature reheat steam pipeline and the secondary high temperature reheat steam pipeline are connected, and the heat of the steam from the main steam pipeline or the primary high temperature reheat steam pipeline or the secondary high temperature reheat steam pipeline is released to the self-cooling molten salt tank pump The cold molten salt produced; the steam side of the low temperature steam-molten salt heat exchanger group is connected to the primary low temperature reheat steam pipeline, the secondary low temperature reheat steam pipeline, and the extraction steam pipeline of the high pressure cylinder of the main steam turbine, and the steam from the primary low temperature reheat The heat of the steam in the steam pipeline or the secondary low-temperature reheat steam pipeline or the steam extraction pipeline of the high-pressure cylinder of the main steam turbine is released to the cold molten salt pumped from the cold molten salt tank; the steam side of the high temperature molten salt-steam heat exchanger group is connected with the main steam The steam extraction pipeline of the medium pressure cylinder of the steam turbine is connected with the extraction steam pipeline of the low pressure cylinder of the main steam turbine, and the heat stored by the high temperature hot molten salt in the high temperature hot molten salt tank is released to the steam extraction pipeline of the medium pressure cylinder of the main steam turbine or the steam extraction pipeline of the low pressure cylinder of the main steam turbine. steam; the steam side of the low-temperature molten salt-steam heat exchanger group is connected with the steam extraction pipeline of the middle-pressure cylinder of the main steam turbine and the extraction steam pipeline of the low-pressure cylinder of the main steam turbine to release the heat stored in the low-temperature molten salt tank. The steam is supplied to the steam extraction pipeline of the intermediate pressure cylinder of the main steam turbine or the extraction steam pipeline of the low pressure cylinder of the main steam turbine; the low pressure cylinder of the main steam turbine is connected to the condenser.

Compared with the prior art, the beneficial effects of the present utility model are:

(1) When the thermal power unit is running at low or extremely low load caused by the deep peak regulation of the power grid or the difference between the peak and valley, the load of the unit should be appropriately increased, and the remaining heat after meeting the power supply and heating demand will be stored in the high and low temperature molten salt tanks. When the power grid load and heating load demand are high, the stored heat can be released in a cascade for use, which can improve equipment utilization, power generation efficiency, safety, reliability, and economy, and reduce equivalent pollutant emissions; further, make the unit load long-term. It is higher than its minimum stable combustion load, eliminates potential safety hazards, and does not need to be retrofitted to reduce the minimum stable combustion load due to the deep peak shaving of the power grid, saving investment.

(2) Compared with the existing thermal power unit energy storage technology, the cascade energy storage and the cascade utilization of the stored energy can make the whole system reach higher efficiency, the utility model is provided with two molten salt thermal storage tanks of high temperature and low temperature, each Corresponding to a set of charging and exothermic heat exchangers, the heat of the steam with different parameters of the thermal power unit can be preferably stored in steps according to the needs. Reduce heat transfer end difference loss.

(3) the freezing point of molten salt is high, and the temperature required to maintain molten salt work is higher, and the thermal power unit steam still has a very high parameter after releasing the heat stepwise to the molten salt, and the system of the present utility model utilizes the steam after the heat release, Avoid losses and maximize energy utilization efficiency in accordance with the principle of cascade utilization.

(4) There are many sources of high-parameter steam for energy storage and low-parameter steam heated by molten salt of the present invention, including main steam, reheated steam and extraction steam of main steam turbine; steam after releasing heat to molten salt and heated by molten salt There are many users of steam heated by molten salt, including heat recovery, flue gas, auxiliary steam, heating system, etc.; cascade heat storage and heat consumption will not stop the energy storage system or even affect its operation due to the failure of a certain source or user system. Security; multi-source, multi-user can be selected according to the needs of engineering design. The utility model has a complete system, high reliability, and flexibility. At the same time, because of the access of the energy storage system, the operation safety and reliability of each user are greatly improved.

(5) The utility model adopts two hot-melt salt tanks of high temperature and low temperature, and a scheme of one cold-melt salt tank. Compared with the scheme of only one hot-melt salt tank, the volume capacities of the two hot-melt salt tanks of high temperature and low temperature are equal to each other. It can be appropriately reduced to improve safety; at the same time, according to the concept of cascade energy storage, the design temperature of the low-temperature hot-melt salt tank does not need to reach the design temperature of the high-temperature hot-melt salt tank, such as 580 °C, but can be lower than 400 °C, and the material does not need to use high-temperature heat. The stainless steel used in the molten salt tank can be made of carbon steel, which further improves the safety and saves investment.

Description of drawings

Fig. 1 is embodiment 1 of the non-reheat thermal power unit molten salt cascade storage and discharge energy peak regulation system of the present utility model;

Fig. 2 is embodiment 2 of the utility model once reheat thermal power unit molten salt cascade storage and discharge energy peak regulation system;

Fig. 3 is the peak regulation system of molten salt cascade storage and discharge energy of the double reheat thermal power unit according to the third embodiment of the present invention.

In the picture:

1. High temperature steam-molten salt heat exchanger group, 2. Low temperature steam-molten salt heat exchanger group, 3. High temperature molten salt-steam heat exchanger group, 4. Low temperature molten salt-steam heat exchanger group, 5. High temperature hot molten salt tank, 5a, high temperature hot molten salt pump, 6, low temperature hot molten salt tank, 6a, low temperature hot molten salt pump, 7, cold molten salt tank, 7a, cold molten salt pump I, 7b, cold molten salt Pump II, 8, boiler, 9, main steam turbine super high pressure cylinder, 10, main steam turbine high pressure cylinder, 11, main steam turbine medium pressure cylinder, 12, main steam turbine low pressure cylinder, 13, condenser, 14, condensate pump, 15, Low pressure heater module, 16, deaerator, 17, small steam turbine for feed water pump, 18, high pressure heater module, 19, feed water pump, 20, auxiliary steam pipeline, 21, heating system, 22, economizer, 23, Water Wall, 24, Superheater, 25, Primary Reheater, 26, Secondary Reheater, 27, Primary Air Heater, 28, Supply Air Heater, 29, Primary Fan, 30, Supply Fan, 31, Air preheater, 32, dust collector, 33, induced draft fan, small steam turbine, 34, induced draft fan, 35, desulfurization tower, 36, flue gas heater, 37, chimney.

Detailed ways

The following describes in detail the embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, but should not be construed as a limitation of the present invention.

Example 1

The thermal power unit in this embodiment is a non-reheat unit.

As shown in Fig. 1, a thermal power unit's molten salt cascade energy storage and discharge energy peak regulation system includes a thermal power unit and a molten salt cascade energy storage and discharge system.

Among them, the thermal power unit includes a boiler 8, a main steam turbine, a condenser 13, a condensate pump 14, a feed pump 19, a heat recovery system, a feed pump small steam turbine 17, an auxiliary steam pipeline 20, a small induced draft fan steam turbine 33 and a flue gas system, the boiler 8. Connect the main steam turbine through the steam pipeline, output the main steam to the main steam turbine, and heat the low-temperature reheated steam from the main steam turbine to the high-temperature reheated steam and then return it to the main steam turbine; The heat system is recycled; the boiler 8 is connected to the heat recovery system through the water supply pipeline, and the boiler 8 is connected to the smoke air system through the primary air duct, the air supply duct, and the flue;

Among them, the molten salt cascade energy storage and release system includes high temperature steam-molten salt heat exchanger group 1, low temperature steam-molten salt heat exchanger group 2, high temperature molten salt-steam heat exchanger group 3, low temperature molten salt-steam heat exchange group Device group 4, high temperature hot molten salt tank 5, low temperature hot molten salt tank 6, cold molten salt tank 7, high temperature hot molten salt tank 5 is provided with high temperature hot molten salt pump 5a, low temperature hot molten salt tank 6 is provided with low temperature The hot molten salt pump 6a and the cold molten salt tank 7 are provided with a cold molten salt pump I7a and a cold molten salt pump II7b, which are used for the high temperature hot molten salt tank 5, the low temperature hot molten salt tank 6 and the cold molten salt tank 7 to pump out the molten salt. Salt.

Among them, the molten salt side of the high temperature steam-molten salt heat exchanger group 1 is connected to the high temperature hot molten salt tank 5, the low temperature hot molten salt tank 6 and the cold molten salt tank 7; the steam side of the high temperature steam-molten salt heat exchanger group 1 is connected to The boiler 8 is connected to the main steam turbine steam pipeline, the heat recovery system, the auxiliary steam pipeline 20, the heating system 21, and the flue gas system, and the heat of the steam from the boiler 8 to the main steam turbine steam pipeline is released to the self-cooling molten salt tank 7. Pump out The cold molten salt is made into hot molten salt, and is stored in the high temperature hot molten salt tank 5 and the low temperature hot molten salt tank 6 according to the temperature of the hot molten salt, and the steam after exothermic is stepped according to its parameters (mainly temperature) characteristics Used for heat recovery system, auxiliary steam pipeline 20, heating system 21, and flue gas system;

Among them, the molten salt side of the low temperature steam-molten salt heat exchanger group 2 is connected with the low temperature hot molten salt tank 6 and the cold molten salt tank 7; the steam side of the low temperature steam-molten salt heat exchanger group 2 is connected with the main steam turbine to the boiler 8 steam pipeline , The main steam turbine extraction pipe, the heat recovery system, the auxiliary steam pipe 20, the heating system 21, and the flue gas system are connected, and the heat of the steam from the main steam turbine to the boiler 8 steam pipe or the main steam turbine extraction pipe is released to the self-cooling molten salt. The cold molten salt pumped out of the tank 7 is made into low temperature hot molten salt, and stored in the low temperature hot molten salt tank 6, and the steam after the heat release is used for the heat recovery system, the auxiliary steam pipeline 20, and the heating according to its parameter characteristics. System 21, smoke and air system;

Among them, the molten salt side of the high temperature molten salt-steam heat exchanger group 3 is connected to the high temperature hot molten salt tank 5, the low temperature hot molten salt tank 6 and the cold molten salt tank 7; the steam side of the high temperature molten salt-steam heat exchanger group 3 is connected to The main steam turbine extraction pipeline, the heat recovery system, the heating system 21, the feed water pump small steam turbine 17, and the induced draft fan small steam turbine 33 are connected to release the heat stored in the high-temperature molten salt tank 5 to the steam extraction pipeline of the independent steam turbine The steam coming from the steam is increased in parameters, and is used in the regenerative system, the heating system 21, the small steam turbine 17 of the feed pump, the small steam turbine 33 of the induced draft fan, and the molten salt after heat release is stored at low temperature according to its temperature cascade. Hot molten salt tank 6 or cold molten salt tank 7;

Among them, the molten salt side of the low temperature molten salt-steam heat exchanger group 4 is connected with the low temperature hot molten salt tank 6 and the cold molten salt tank 7; the steam side of the low temperature molten salt-steam heat exchanger group 4 is connected with the main steam turbine extraction pipeline, return The heating system, the heating system 21, the auxiliary steam pipeline 20, and the flue gas system are connected, and the heat stored in the low-temperature molten salt tank 6 is released to the steam from the steam extraction pipeline of the main steam turbine, and its parameters are improved, and according to the Its parameter characteristic steps are used in the heat recovery system, the heating system 21 , the auxiliary steam pipeline 20 , and the flue gas system, and the molten salt after heat release is stored in the cold molten salt tank 7 .

In one embodiment, according to actual needs, the high-temperature steam-molten salt heat exchanger group 1 may be one heat exchanger, or multiple heat exchangers may be connected in series or in parallel; the low-temperature steam-molten salt heat exchanger group 2 may be It is a heat exchanger, or multiple heat exchangers in series or parallel; the high-temperature molten salt-steam heat exchanger group 3 can be one heat exchanger, or multiple heat exchangers in series or parallel; low-temperature molten salt - The steam heat exchanger group 4 may be one heat exchanger, or a plurality of heat exchangers may be connected in series or in parallel.

In one embodiment, the heat recovery system includes a low-pressure heater module 15, a deaerator 16, and a high-pressure heater module 18 connected in sequence, and a condenser 13 and a condensate pump are connected in sequence between the main steam turbine and the low-pressure heater module 15. 14; A feed water pump 19 is connected between the deaerator 16 and the high pressure heater module 18, the feed water pump 19 is driven by the feed water pump small steam turbine 17, and the feed water pump small steam turbine 17 is connected to the steam side of the high temperature molten salt-steam heat exchanger group 3 The high pressure heater module 18 is connected with the economizer 22 of the boiler 8 through the water supply pipeline, and the low pressure heater module 15 and the deaerator 16 are respectively connected with the high temperature steam-molten salt heat exchanger group 1, the low temperature steam-molten salt heat exchange The high-pressure heater modules 18 are respectively connected to the high-temperature steam-molten salt heat exchanger group 1, the low-temperature steam-molten salt heat exchanger group 2, the high-temperature molten salt-steam heat exchanger group 3, and the low-temperature molten salt heat exchanger group 3, respectively. The steam side of the salt-steam heat exchanger group 4 is connected.

In one embodiment, the flue gas system includes a flue gas system and an air system, and the flue gas system is sequentially connected to the dust collector 32, the induced draft fan 34, the desulfurization tower 35, the flue gas heater 36 and The chimney 37 and the induced draft fan 34 are driven by the small induced draft fan steam turbine 33, and the small induced draft fan steam turbine 33 is connected to the steam side of the high temperature molten salt-steam heat exchanger group 3; the air system includes a primary air heater 27 and a supply air heater 28 , the primary fan 29, the blower 30, the primary fan 29 and the blower 30 are respectively connected to the primary air heater 27 and the air supply heater 28 through the primary air duct and the air supply duct, and then pass through the primary air duct, the air supply duct and the boiler 8 connected, the primary air heater 27, the supply air heater 28, and the flue gas heater 36 are respectively connected to the high temperature steam-molten salt heat exchanger group 1, the low temperature steam-molten salt heat exchanger group 2, the low temperature molten salt- The steam side of the steam heat exchanger group 4 is connected.

In this embodiment, the thermal power unit is a non-reheat unit, and the main steam turbine includes a main steam turbine high-pressure cylinder 10 and a main steam turbine low-pressure cylinder 12. The main steam turbine high-pressure cylinder 10 is connected to the superheater 24 of the boiler 8 through a main steam pipeline; the high-temperature steam- The steam side of the molten salt heat exchanger group 1 is connected to the main steam pipeline, and the heat of the steam from the main steam pipeline is released to the cold molten salt pumped from the cold molten salt tank 7; the steam side of the low temperature steam-molten salt heat exchanger group 2 It is connected with the steam extraction pipeline of the high-pressure cylinder 10 of the main steam turbine, and the heat of the steam from the steam extraction pipeline of the high-pressure cylinder 10 of the main steam turbine is released to the cold molten salt pumped from the cold molten salt tank 7; the high-temperature molten salt-steam heat exchanger group 3 steam The side is connected to the steam extraction pipeline of the low-pressure cylinder 12 of the main steam turbine, and releases the heat stored by the high-temperature molten salt in the high-temperature molten salt tank 5 to the steam from the extraction pipeline of the low-pressure cylinder 12 of the main steam turbine; low-temperature molten salt-steam heat exchanger The steam side of group 4 is connected to the steam extraction pipeline of the low-pressure cylinder 12 of the main steam turbine, and releases the heat stored in the low-temperature molten salt tank 6 to the steam from the extraction pipeline of the low-pressure cylinder 12 of the main steam turbine; the low-pressure cylinder 12 of the main steam turbine Connected to the condenser 13.

Among them, when the thermal power unit without reheating works independently, the boiler 8 generates main steam to the main steam turbine high pressure cylinder 10 to do work, and the main steam turbine high pressure cylinder 10 exhausts steam into the main steam turbine low pressure cylinder 12 to do work and then discharges to the condenser 13 to condense into water, and then The condensed water in the condenser 13 is pumped out by the condensate pump 14, heated by the low pressure heater module 15 and the deaerator 16, then pressurized by the feed water pump 19 and reheated by the high pressure heater module 18, and then sent to the boiler 8. The economizer 22; the primary fan 29 and the blower 30 provide conveying air and burning air for the combustion of pulverized coal in the boiler 8; the primary air heater 27 and the supply air heater 28 are used to preheat the primary air and supply air; flue gas The heater 36 is used to heat the flue gas to increase the flue gas temperature (whitening).

Example 2

The thermal power unit in this embodiment is a primary reheat unit.

As shown in Fig. 2, a thermal power unit's molten salt cascade energy storage and discharge energy peak regulation system includes a thermal power unit and a molten salt cascade energy storage and release system.

Among them, the thermal power unit includes a boiler 8, a main steam turbine, a condenser 13, a condensate pump 14, a feed pump 19, a heat recovery system, a feed pump small steam turbine 17, an auxiliary steam pipeline 20, a small induced draft fan steam turbine 33 and a flue gas system, the boiler 8. Connect the main steam turbine through the steam pipeline, output the main steam to the main steam turbine, and heat the low-temperature reheated steam from the main steam turbine to the high-temperature reheated steam and then return it to the main steam turbine; The heat system is recycled; the boiler 8 is connected to the heat recovery system through the water supply pipeline, and the boiler 8 is connected to the smoke air system through the primary air duct, the air supply duct, and the flue;

Among them, the molten salt cascade energy storage and release system includes high temperature steam-molten salt heat exchanger group 1, low temperature steam-molten salt heat exchanger group 2, high temperature molten salt-steam heat exchanger group 3, low temperature molten salt-steam heat exchange group Device group 4, high temperature hot molten salt tank 5, low temperature hot molten salt tank 6, cold molten salt tank 7, high temperature hot molten salt tank 5 is provided with high temperature hot molten salt pump 5a, low temperature hot molten salt tank 6 is provided with low temperature The hot molten salt pump 6a and the cold molten salt tank 7 are provided with a cold molten salt pump I7a and a cold molten salt pump II7b, which are used for the high temperature hot molten salt tank 5, the low temperature hot molten salt tank 6 and the cold molten salt tank 7 to pump out the molten salt. Salt.

Among them, the molten salt side of the high temperature steam-molten salt heat exchanger group 1 is connected to the high temperature hot molten salt tank 5, the low temperature hot molten salt tank 6 and the cold molten salt tank 7; the steam side of the high temperature steam-molten salt heat exchanger group 1 is connected to The boiler 8 is connected to the main steam turbine steam pipeline, the heat recovery system, the auxiliary steam pipeline 20, the heating system 21, and the flue gas system, and the heat of the steam from the boiler 8 to the main steam turbine steam pipeline is released to the self-cooling molten salt tank 7. Pump out The cold molten salt is made into hot molten salt, and is stored in the high temperature hot molten salt tank 5 and the low temperature hot molten salt tank 6 according to the temperature of the hot molten salt, and the steam after exothermic is stepped according to its parameters (mainly temperature) characteristics Used for heat recovery system, auxiliary steam pipeline 20, heating system 21, and flue gas system;

Among them, the molten salt side of the low temperature steam-molten salt heat exchanger group 2 is connected with the low temperature hot molten salt tank 6 and the cold molten salt tank 7; the steam side of the low temperature steam-molten salt heat exchanger group 2 is connected with the main steam turbine to the boiler 8 steam pipeline , The main steam turbine extraction pipe, the heat recovery system, the auxiliary steam pipe 20, the heating system 21, and the flue gas system are connected, and the heat of the steam from the main steam turbine to the boiler 8 steam pipe or the main steam turbine extraction pipe is released to the self-cooling molten salt. The cold molten salt pumped out of the tank 7 is made into low temperature hot molten salt, and stored in the low temperature hot molten salt tank 6, and the steam after the heat release is used for the heat recovery system, the auxiliary steam pipeline 20, and the heating according to its parameter characteristics. System 21, smoke and air system;

Among them, the molten salt side of the high temperature molten salt-steam heat exchanger group 3 is connected to the high temperature hot molten salt tank 5, the low temperature hot molten salt tank 6 and the cold molten salt tank 7; the steam side of the high temperature molten salt-steam heat exchanger group 3 is connected to The main steam turbine extraction pipeline, the heat recovery system, the heating system 21, the feed water pump small steam turbine 17, and the induced draft fan small steam turbine 33 are connected to release the heat stored in the high-temperature molten salt tank 5 to the steam extraction pipeline of the independent steam turbine The steam coming from the steam is increased in parameters, and is used in the regenerative system, the heating system 21, the small steam turbine 17 of the feed pump, the small steam turbine 33 of the induced draft fan, and the molten salt after heat release is stored at low temperature according to its temperature cascade. Hot molten salt tank 6 or cold molten salt tank 7;

Among them, the molten salt side of the low temperature molten salt-steam heat exchanger group 4 is connected with the low temperature hot molten salt tank 6 and the cold molten salt tank 7; the steam side of the low temperature molten salt-steam heat exchanger group 4 is connected with the main steam turbine extraction pipeline, return The heating system, the heating system 21, the auxiliary steam pipeline 20, and the flue gas system are connected, and the heat stored in the low-temperature molten salt tank 6 is released to the steam from the steam extraction pipeline of the main steam turbine, and its parameters are improved, and according to the Its parameter characteristic steps are used in the heat recovery system, the heating system 21 , the auxiliary steam pipeline 20 , and the flue gas system, and the molten salt after heat release is stored in the cold molten salt tank 7 .

In one embodiment, according to actual needs, the high-temperature steam-molten salt heat exchanger group 1 may be one heat exchanger, or multiple heat exchangers may be connected in series or in parallel; the low-temperature steam-molten salt heat exchanger group 2 may be It is a heat exchanger, or multiple heat exchangers in series or parallel; the high-temperature molten salt-steam heat exchanger group 3 can be one heat exchanger, or multiple heat exchangers in series or parallel; low-temperature molten salt - The steam heat exchanger group 4 may be one heat exchanger, or a plurality of heat exchangers may be connected in series or in parallel.

In one embodiment, the heat recovery system includes a low-pressure heater module 15, a deaerator 16, and a high-pressure heater module 18 connected in sequence, and a condenser 13 and a condensate pump are connected in sequence between the main steam turbine and the low-pressure heater module 15. 14; A feed water pump 19 is connected between the deaerator 16 and the high pressure heater module 18, the feed water pump 19 is driven by the feed water pump small steam turbine 17, and the feed water pump small steam turbine 17 is connected to the steam side of the high temperature molten salt-steam heat exchanger group 3 The high pressure heater module 18 is connected with the economizer 22 of the boiler 8 through the water supply pipeline, and the low pressure heater module 15 and the deaerator 16 are respectively connected with the high temperature steam-molten salt heat exchanger group 1, the low temperature steam-molten salt heat exchange The high-pressure heater modules 18 are respectively connected to the high-temperature steam-molten salt heat exchanger group 1, the low-temperature steam-molten salt heat exchanger group 2, the high-temperature molten salt-steam heat exchanger group 3, and the low-temperature molten salt heat exchanger group 3, respectively. The steam side of the salt-steam heat exchanger group 4 is connected.

In one embodiment, the flue gas system includes a flue gas system and an air system, and the flue gas system is sequentially connected to the dust collector 32, the induced draft fan 34, the desulfurization tower 35, the flue gas heater 36 and The chimney 37 and the induced draft fan 34 are driven by the small induced draft fan steam turbine 33, and the small induced draft fan steam turbine 33 is connected to the steam side of the high temperature molten salt-steam heat exchanger group 3; the air system includes a primary air heater 27 and a supply air heater 28 , the primary fan 29, the blower 30, the primary fan 29 and the blower 30 are respectively connected to the primary air heater 27 and the air supply heater 28 through the primary air duct and the air supply duct, and then pass through the primary air duct, the air supply duct and the boiler 8 connected, the primary air heater 27, the supply air heater 28, and the flue gas heater 36 are respectively connected to the high temperature steam-molten salt heat exchanger group 1, the low temperature steam-molten salt heat exchanger group 2, the low temperature molten salt- The steam side of the steam heat exchanger group 4 is connected.

In this embodiment, the thermal power unit is a primary reheat unit, and the main steam turbine includes a main steam turbine high pressure cylinder 10, a main steam turbine medium pressure cylinder 11 and a main steam turbine low pressure cylinder 12, and the main steam turbine high pressure cylinder 10 is reheated through the main steam pipeline and the low temperature respectively. The steam pipe is connected to the superheater 24 and the primary reheater 25 of the boiler 8; the primary reheater 25 is then connected to the medium pressure cylinder 11 of the main steam turbine through the high temperature reheat steam pipe; the steam side of the high temperature steam-molten salt heat exchanger group 1 It is connected with the main steam pipeline and the high temperature reheat steam pipeline, and the heat of the steam from the main steam pipeline or the high temperature reheat steam pipeline is released to the cold molten salt pumped from the cold molten salt tank 7; the low temperature steam-molten salt heat exchanger group 2 The steam side is connected with the low temperature reheat steam pipeline and the extraction steam pipeline of the main steam turbine high pressure cylinder 10, and the heat from the low temperature reheat steam pipeline or the steam extraction pipeline of the main steam turbine high pressure cylinder 10 is released to the steam pumped from the cold molten salt tank 7. Cold molten salt; the steam side of the high temperature molten salt-steam heat exchanger group 3 is connected to the steam extraction pipeline of the medium pressure cylinder 11 of the main steam turbine and the extraction steam pipeline of the low pressure cylinder 12 of the main steam turbine, and the high temperature hot molten salt tank 5 The heat stored in the salt is released to the steam from the steam extraction pipeline of the intermediate pressure cylinder 11 of the main steam turbine or the steam extraction pipeline of the low pressure cylinder 12 of the main steam turbine; The pipeline is connected with the extraction pipeline of the low-pressure cylinder 12 of the main steam turbine, and releases the heat stored in the low-temperature molten salt tank 6 to the extraction pipeline of the intermediate-pressure cylinder 11 of the main steam turbine or the extraction pipeline of the low-pressure cylinder 12 of the main steam turbine. Steam; the main steam turbine low pressure cylinder 12 is connected with the condenser 13.

Wherein, when the primary reheat thermal power unit works independently, the boiler 8 generates main steam to the main steam turbine high pressure cylinder 10 to do work, and the exhaust gas from the main steam turbine high pressure cylinder 10 enters the primary reheater 25 of the boiler 8 to absorb heat and then goes to the main steam turbine intermediate pressure cylinder 11 Continue to do work, the main steam turbine medium pressure cylinder 11 exhausts steam into the main steam turbine low pressure cylinder 12 to perform work and then discharges to the condenser 13 to condense into water, and then the condensate pump 14 draws out the condensed water in the condenser 13, and passes through the low pressure heater module 15. After the deaerator 16 is heated, it is pressurized by the feed water pump 19 and reheated by the high-pressure heater module 18 and sent to the economizer 22 of the boiler 8; The primary air heater 27 and the supply air heater 28 are used to preheat the primary air and the supply air; the flue gas heater 36 is used to heat the flue gas to increase the flue gas temperature (whitening).

Example 3

In this embodiment, the thermal power unit is a secondary reheat unit.

As shown in Fig. 3, a thermal power unit's molten salt cascade energy storage and discharge energy peak regulation system includes a thermal power unit and a molten salt cascade energy storage and discharge system.

Among them, the thermal power unit includes a boiler 8, a main steam turbine, a condenser 13, a condensate pump 14, a feed pump 19, a heat recovery system, a feed pump small steam turbine 17, an auxiliary steam pipeline 20, a small induced draft fan steam turbine 33 and a flue gas system, the boiler 8. Connect the main steam turbine through the steam pipeline, output the main steam to the main steam turbine, and heat the low-temperature reheated steam from the main steam turbine to the high-temperature reheated steam and then return it to the main steam turbine; The heat system is recycled; the boiler 8 is connected to the heat recovery system through the water supply pipeline, and the boiler 8 is connected to the smoke air system through the primary air duct, the air supply duct, and the flue;

Among them, the molten salt cascade energy storage and release system includes high temperature steam-molten salt heat exchanger group 1, low temperature steam-molten salt heat exchanger group 2, high temperature molten salt-steam heat exchanger group 3, low temperature molten salt-steam heat exchange group Device group 4, high temperature hot molten salt tank 5, low temperature hot molten salt tank 6, cold molten salt tank 7, high temperature hot molten salt tank 5 is provided with high temperature hot molten salt pump 5a, low temperature hot molten salt tank 6 is provided with low temperature The hot molten salt pump 6a and the cold molten salt tank 7 are provided with a cold molten salt pump I7a and a cold molten salt pump II7b, which are used for the high temperature hot molten salt tank 5, the low temperature hot molten salt tank 6 and the cold molten salt tank 7 to pump out the molten salt. Salt.

Among them, the molten salt side of the high temperature steam-molten salt heat exchanger group 1 is connected to the high temperature hot molten salt tank 5, the low temperature hot molten salt tank 6 and the cold molten salt tank 7; the steam side of the high temperature steam-molten salt heat exchanger group 1 is connected to The boiler 8 is connected to the main steam turbine steam pipeline, the heat recovery system, the auxiliary steam pipeline 20, the heating system 21, and the flue gas system, and the heat of the steam from the boiler 8 to the main steam turbine steam pipeline is released to the self-cooling molten salt tank 7. Pump out The cold molten salt is made into hot molten salt, and is stored in the high temperature hot molten salt tank 5 and the low temperature hot molten salt tank 6 according to the temperature of the hot molten salt, and the steam after exothermic is stepped according to its parameters (mainly temperature) characteristics Used for heat recovery system, auxiliary steam pipeline 20, heating system 21, and flue gas system;

Among them, the molten salt side of the low temperature steam-molten salt heat exchanger group 2 is connected with the low temperature hot molten salt tank 6 and the cold molten salt tank 7; the steam side of the low temperature steam-molten salt heat exchanger group 2 is connected with the main steam turbine to the boiler 8 steam pipeline , The main steam turbine extraction pipe, the heat recovery system, the auxiliary steam pipe 20, the heating system 21, and the flue gas system are connected, and the heat of the steam from the main steam turbine to the boiler 8 steam pipe or the main steam turbine extraction pipe is released to the self-cooling molten salt. The cold molten salt pumped out of the tank 7 is made into low temperature hot molten salt, and stored in the low temperature hot molten salt tank 6, and the steam after the heat release is used for the heat recovery system, the auxiliary steam pipeline 20, and the heating according to its parameter characteristics. System 21, smoke and air system;

Among them, the molten salt side of the high temperature molten salt-steam heat exchanger group 3 is connected to the high temperature hot molten salt tank 5, the low temperature hot molten salt tank 6 and the cold molten salt tank 7; the steam side of the high temperature molten salt-steam heat exchanger group 3 is connected to The main steam turbine extraction pipeline, the heat recovery system, the heating system 21, the feed water pump small steam turbine 17, and the induced draft fan small steam turbine 33 are connected to release the heat stored in the high-temperature molten salt tank 5 to the steam extraction pipeline of the independent steam turbine The steam coming from the steam is increased in parameters, and is used in the regenerative system, the heating system 21, the small steam turbine 17 of the feed pump, the small steam turbine 33 of the induced draft fan, and the molten salt after heat release is stored at low temperature according to its temperature cascade. Hot molten salt tank 6 or cold molten salt tank 7;

Among them, the molten salt side of the low temperature molten salt-steam heat exchanger group 4 is connected with the low temperature hot molten salt tank 6 and the cold molten salt tank 7; the steam side of the low temperature molten salt-steam heat exchanger group 4 is connected with the main steam turbine extraction pipeline, return The heating system, the heating system 21, the auxiliary steam pipeline 20, and the flue gas system are connected, and the heat stored in the low-temperature molten salt tank 6 is released to the steam from the steam extraction pipeline of the main steam turbine, and its parameters are improved, and according to the Its parameter characteristic steps are used in the heat recovery system, the heating system 21 , the auxiliary steam pipeline 20 , and the flue gas system, and the molten salt after heat release is stored in the cold molten salt tank 7 .

In one embodiment, according to actual needs, the high-temperature steam-molten salt heat exchanger group 1 may be one heat exchanger, or multiple heat exchangers may be connected in series or in parallel; the low-temperature steam-molten salt heat exchanger group 2 may be It is a heat exchanger, or multiple heat exchangers in series or parallel; the high-temperature molten salt-steam heat exchanger group 3 can be one heat exchanger, or multiple heat exchangers in series or parallel; low-temperature molten salt - The steam heat exchanger group 4 may be one heat exchanger, or a plurality of heat exchangers may be connected in series or in parallel.

In one embodiment, the heat recovery system includes a low-pressure heater module 15, a deaerator 16, and a high-pressure heater module 18 connected in sequence, and a condenser 13 and a condensate pump are connected in sequence between the main steam turbine and the low-pressure heater module 15. 14; A feed water pump 19 is connected between the deaerator 16 and the high pressure heater module 18, the feed water pump 19 is driven by the feed water pump small steam turbine 17, and the feed water pump small steam turbine 17 is connected to the steam side of the high temperature molten salt-steam heat exchanger group 3 The high pressure heater module 18 is connected with the economizer 22 of the boiler 8 through the water supply pipeline, and the low pressure heater module 15 and the deaerator 16 are respectively connected with the high temperature steam-molten salt heat exchanger group 1, the low temperature steam-molten salt heat exchange The high-pressure heater modules 18 are respectively connected to the high-temperature steam-molten salt heat exchanger group 1, the low-temperature steam-molten salt heat exchanger group 2, the high-temperature molten salt-steam heat exchanger group 3, and the low-temperature molten salt heat exchanger group 3, respectively. The steam side of the salt-steam heat exchanger group 4 is connected.

In one embodiment, the flue gas system includes a flue gas system and an air system, and the flue gas system is sequentially connected to the dust collector 32, the induced draft fan 34, the desulfurization tower 35, the flue gas heater 36 and The chimney 37 and the induced draft fan 34 are driven by the small induced draft fan steam turbine 33, and the small induced draft fan steam turbine 33 is connected to the steam side of the high temperature molten salt-steam heat exchanger group 3; the air system includes a primary air heater 27 and a supply air heater 28 , the primary fan 29, the blower 30, the primary fan 29 and the blower 30 are respectively connected to the primary air heater 27 and the air supply heater 28 through the primary air duct and the air supply duct, and then pass through the primary air duct, the air supply duct and the boiler 8 connected, the primary air heater 27, the supply air heater 28, and the flue gas heater 36 are respectively connected to the high temperature steam-molten salt heat exchanger group 1, the low temperature steam-molten salt heat exchanger group 2, the low temperature molten salt- The steam side of the steam heat exchanger group 4 is connected.

In this embodiment, the thermal power unit is a secondary reheat unit, and the main steam turbine includes a main steam turbine ultra-high pressure cylinder 9, a main steam turbine high-pressure cylinder 10, a main steam turbine medium pressure cylinder 11 and a main steam turbine low-pressure cylinder 12, and the main steam turbine ultra-high pressure cylinder 9 The main steam turbine high pressure cylinder 10 is connected to the boiler through the primary high temperature reheat steam pipeline and the secondary low temperature reheat steam pipeline respectively through the main steam pipeline and the primary low temperature reheat steam pipeline. The primary reheater 25 and the secondary reheater 26 of 8 are connected; the middle pressure cylinder 11 of the main steam turbine is connected to the secondary reheater 26 of the boiler 8 through the secondary high temperature reheat steam pipeline; the high temperature steam-molten salt heat exchanger The steam side of group 1 is connected to the main steam pipeline, the primary high temperature reheat steam pipeline and the secondary high temperature reheat steam pipeline, and the heat of the steam from the main steam pipeline or the primary high temperature reheat steam pipeline or the secondary high temperature reheat steam pipeline is released to the self. The cold molten salt pumped out of the cold molten salt tank 7; the steam side of the low temperature steam-molten salt heat exchanger group 2 is connected with the primary low temperature reheat steam pipeline, the secondary low temperature reheat steam pipeline, and the main steam turbine high pressure cylinder 10 steam extraction pipeline, The heat from the primary low temperature reheat steam pipeline or secondary low temperature reheat steam pipeline or the steam extraction pipeline of the main steam turbine high pressure cylinder 10 is released to the cold molten salt pumped from the cold molten salt tank 7; high temperature molten salt-steam heat exchange The steam side of the steam turbine group 3 is connected to the steam extraction pipeline of the main steam turbine medium pressure cylinder 11 and the main steam turbine low pressure cylinder 12, and the heat stored in the high temperature hot molten salt tank 5 is released to the main steam turbine medium pressure cylinder 11. The steam from the steam pipeline or the extraction pipeline of the low-pressure cylinder 12 of the main steam turbine; the steam side of the low-temperature molten salt-steam heat exchanger group 4 is connected to the extraction pipeline of the medium-pressure cylinder 11 of the main steam turbine and the extraction pipeline of the low-pressure cylinder 12 of the main steam turbine. The heat stored by the low temperature hot molten salt in the hot molten salt tank 6 is released to the steam from the steam extraction pipeline of the main steam turbine medium pressure cylinder 11 or the main steam turbine low pressure cylinder 12; the main steam turbine low pressure cylinder 12 is connected to the condenser 13 .

Among them, when the secondary reheat thermal power unit works independently, the boiler 8 generates main steam to the main steam turbine ultra-high pressure cylinder 9 to do work, and the exhaust gas from the main steam turbine ultra-high pressure cylinder 9 enters the primary reheater 25 of the boiler 8 to absorb heat and then reaches the main steam turbine high pressure. The cylinder 10 continues to do work, the exhaust gas from the high pressure cylinder 10 of the main steam turbine enters the secondary reheater 26 of the boiler 8 to absorb heat and then goes to the intermediate pressure cylinder 11 of the main steam turbine to continue to do work, and the exhaust steam from the intermediate pressure cylinder 11 of the main steam turbine enters the low pressure cylinder 12 of the main steam turbine to do work. It is then discharged to the condenser 13 and condensed into water, and then the condensed water in the condenser 13 is pumped out by the condensate pump 14, heated by the low-pressure heater module 15 and the deaerator 16, and then pressurized by the feed pump 19 and passed through the high-pressure The heater module 18 is reheated and sent to the economizer 22 of the boiler 8; the primary fan 29 and the blower 30 provide the conveying air and the burning air for the pulverized coal combustion of the boiler 8, the primary air heater 27 and the supply air heater 28 Used to preheat the primary air and supply air; the flue gas heater 36 is used to heat the flue gas to increase the flue gas temperature (whitening).

In addition, for thermal power units with no reheating, primary reheating, and secondary reheating, coal, oil, gas, biomass, garbage, sludge, etc. can be selected as fuel.

The principle of using this thermal power unit's molten salt cascade storage and discharge energy peak regulation system for power supply and heating is as follows:

a1. When the power grid peak regulation or peak-valley difference requires low unit load, properly increase the unit load, pump steam from the steam pipeline from boiler 8 to the main steam turbine to high temperature steam-molten salt heat exchanger unit 1, and heat it by cold molten salt The cold molten salt pumped out of the tank 7, the heated hot molten salt is selectively stored in the high temperature hot molten salt tank 5 or the low temperature hot molten salt tank 6 according to its temperature, and the steam after the heat release can be selectively according to the parameter characteristics. To high pressure heater module 18 to heat boiler feed water, or to deaerator 16 or low pressure heater module 15 to heat condensate water, or to primary air heater 27, supply air heater 28 to heat boiler inlet air, or to flue gas The heater 36 heats the flue gas, or to the auxiliary steam pipeline 20, or to the heating system 21 for heating;

a2. Extract steam from the steam pipeline from the boiler 8 to the main steam turbine or the steam extraction pipeline of the main steam turbine to the low temperature steam-molten salt heat exchanger group 2, and heat the cold molten salt pumped from the cold molten salt tank 7. After being heated The low-temperature hot-melt salt is stored in the low-temperature hot-melt salt tank 6, and the exothermic steam can be selectively heated to the high-pressure heater module 18 to heat the boiler feed water, or to the deaerator 16 or to the low-pressure heater module 15 according to the parameter characteristics. Condensed water, or to the primary air heater 27, supply air heater 28 to heat the boiler inlet air, or to the flue gas heater 36 to heat the flue gas, or to the auxiliary steam pipeline 20, or to the heating system 21 for heating;

b1. When the power grid requires high load or high heating load demand, pump out the high temperature molten salt from the high temperature molten salt tank 5 to the high temperature molten salt-steam heat exchanger group 3, and extract the heating from the steam extraction pipeline of the main steam turbine Then the molten salt is selectively stored in the low temperature hot molten salt tank 6 or the cold molten salt tank 7 according to its temperature; the heated steam can be selectively sent to the high pressure heater module 18 to heat the boiler feed water according to the parameter characteristics, or To the feed water pump small steam turbine 17, or to the induced draft fan small steam turbine 33, or to the heating system 21 for heating;

b2. Pump out the low-temperature molten salt from the low-temperature molten salt tank 6 to the low-temperature molten salt-steam heat exchanger group 4, heat the steam extracted from the steam extraction pipeline of the main steam turbine, and then store the molten salt in the cold molten salt tank 7 for storage , the heated steam can be selectively sent to the high-pressure heater module 18 to heat the boiler feed water, or to the primary air heater 27 and the supply air heater 28 to heat the boiler inlet air, or to the flue gas heater 36 according to the parameter characteristics. The flue gas is supplied to the auxiliary steam pipeline 20 or to the heating system 21 for heating.

Among them, when the thermal power unit is a non-reheat unit, the steam source of the high temperature steam-molten salt heat exchanger group 1 is the main steam, and the steam source of the low temperature steam-molten salt heat exchanger group 2 is the main steam extraction from the high pressure cylinder 10 of the steam turbine, The steam heated by the high-temperature molten salt-steam heat exchanger group 3 comes from the extraction steam of the low-pressure cylinder 12 of the main steam turbine, and the steam heated by the low-temperature molten salt-steam heat exchanger group 4 comes from the extraction steam of the low-pressure cylinder 12 of the main steam turbine;

When the thermal power unit is a primary reheat unit, the steam source of high temperature steam-molten salt heat exchanger group 1 is main steam or high temperature reheat steam, and the steam source of low temperature steam-molten salt heat exchanger group 2 is low temperature reheat steam or high temperature reheat steam. The main steam turbine high pressure cylinder 10 extracts steam, the steam heated by the high temperature molten salt-steam heat exchanger group 3 comes from the main steam turbine medium pressure cylinder 11 or the main steam turbine low pressure cylinder 12, and the low temperature molten salt-steam heat exchanger group 4 The steam heated Extracted steam from the main steam turbine medium pressure cylinder 11 or the main steam turbine low pressure cylinder 12;

When the thermal power unit is a secondary reheat unit, the steam source of the high temperature steam-molten salt heat exchanger group 1 is the main steam or the primary high temperature reheat steam or the secondary high temperature reheat steam, and the low temperature steam-molten salt heat exchanger group 2 The steam source is primary low temperature reheat steam or secondary low temperature reheat steam or extraction steam from high pressure cylinder 10 of main steam turbine, and the steam heated by high temperature molten salt-steam heat exchanger group 3 comes from medium pressure cylinder 11 of main steam turbine or low pressure cylinder of main steam turbine 12 Extraction steam, the steam heated by the low temperature molten salt-steam heat exchanger group 4 is extracted from the main steam turbine medium pressure cylinder 11 or the main steam turbine low pressure cylinder 12.

Among them, when the steam heated or released by the molten salt to the molten salt reaches the high-pressure heater module 18, a certain level of high-pressure heater can be preferably connected according to its parameters; when it reaches the low-pressure heater module 15, it can be connected according to its parameters. The parameters are preferably connected to a certain stage of low pressure heaters.

Of course, the high-temperature steam-molten salt heat exchanger group 1 and the high-temperature molten salt-steam heat exchanger group 3 can work at the same time, and are high-temperature energy storage and release modules; the low-temperature steam-molten salt heat exchanger group 2 and the low-temperature molten salt-steam heat exchanger group 2 The heat exchanger group 4 can work at the same time, and is a low-temperature energy storage and discharge module; the high-temperature energy storage and discharge module and the low-temperature energy storage and discharge module can work at the same time, so as to realize the cascade energy storage and discharge of the system.

In addition, when the high temperature hot molten salt is pumped from the high temperature hot molten salt tank 5 to the high temperature molten salt-steam heat exchanger group 3, an appropriate amount of molten salt in the low temperature hot molten salt tank 6 or the cold molten salt tank 7 can be brought into the high temperature heat exchanger. In the molten salt, the temperature is adjusted; when the low-temperature hot-melt salt is pumped from the low-temperature hot-melt salt tank 6 to the low-temperature molten salt-steam heat exchanger group 4, an appropriate amount of molten salt in the cold-molten salt tank 7 can be merged into the low-temperature hot-melt In salt, adjust the temperature. The system connection line for this function is omitted from the drawings.

Among them, the working fluid in the process of heat storage and release, including molten salt and steam, all need to work above the minimum temperature at which the molten salt does not solidify, and the minimum temperature is the freezing point of the working molten salt plus a certain margin.

In the process of heat storage and release, the temperature of the hot end of the steam can be up to about 600°C, and the temperature of the hot end of the molten salt can be up to about 565°C. The material of the high temperature hot melt salt tank 5 is stainless steel, and the material of the low temperature hot melt salt tank 6 is stainless steel or carbon Steel, the cold molten salt tank 7 is made of carbon steel.

The total heat storage capacity of the energy storage system depends on the power grid peak regulation demand characteristics, heating load demand characteristics, unit capacity, unit parameter level, available site space and other factors. However, the optimization can be determined according to the economy.

It should be understood that in the present utility model, under the principle of energy cascade utilization, the steam source and destination user of the molten salt cascade energy storage and release system are not limited to the above-mentioned sources and users of the present utility model, and can be based on the actual situation of the thermal power unit. Select or combine to form a new or preferred technical solution of the coupling system.

It should be understood that in the present invention, the molten salt cascade energy storage and release system can be an independent system, which can be used in other fields except the field of thermal power steam units, such as nuclear power units, heat transfer oil furnaces (high temperature oil instead of steam, and molten salt). heat exchange); the heat storage medium can also be other media than molten salt, such as water, concrete, etc. Therefore, as long as it is within the scope of the essence of the present invention, the cascade energy storage and release system of different application objects and different heat storage media Applications will fall within the scope of the claims of the present invention.

The above are the preferred embodiments of the present invention. Those skilled in the art can also make changes and modifications to the above-mentioned embodiments. Therefore, the present invention is not limited to the above-mentioned specific embodiments. Any obvious improvement, replacement or modification made on the basis of the present invention belongs to the protection scope of the present invention.

Claims (8)

1. a thermal power unit molten salt cascade storage and discharge energy peak regulation system, is characterized in that, comprises: A thermal power unit, the thermal power unit comprises a boiler (8), a main steam turbine, a condenser (13), a condensate pump (14), a feed water pump (19), a heat recovery system, a feed water pump, a small steam turbine (17), and an auxiliary steam pipeline (20), a small induced draft fan steam turbine (33) and a flue gas system, the boiler (8) is connected to the main steam turbine through a steam pipeline, outputs main steam to the main steam turbine, and heats the low temperature reheated steam from the main steam turbine to high temperature reheating The steam is then returned to the main steam turbine; the main steam turbine is connected to the heat recovery system, and part of the steam is pumped to the heat recovery system for recycling; the boiler (8) is connected to the heat recovery system through a water supply pipeline, and the boiler (8) It is connected with the smoke air system through the primary air duct, air supply duct and flue; A molten salt cascade energy storage and release system, the molten salt cascade energy storage and release system comprises a high temperature steam-molten salt heat exchanger group (1), a low temperature steam-molten salt heat exchanger group (2), a high temperature molten salt-steam exchange Heater group (3), low temperature molten salt-steam heat exchanger group (4), high temperature hot molten salt tank (5), low temperature hot molten salt tank (6), cold molten salt tank (7); The molten salt side of the high temperature steam-molten salt heat exchanger group (1) is connected with a high temperature hot molten salt tank (5), a low temperature hot molten salt tank (6), and a cold molten salt tank (7); the high temperature steam- The steam side of the molten salt heat exchanger group (1) is connected to the steam pipeline from the boiler (8) to the main steam turbine, the heat recovery system, the auxiliary steam pipeline (20), the heating system (21), and the flue gas system, and connects the steam from the boiler (8) to the steam pipeline (20). ) The heat of the steam from the steam pipeline of the main steam turbine is released to the cold molten salt pumped from the cold molten salt tank (7), making it hot molten salt, and is stored in the high temperature hot molten salt tank (5) according to the temperature of the hot molten salt. ), a low-temperature hot molten salt tank (6), and the steam after the heat release is used for the heat recovery system, the auxiliary steam pipeline (20), the heating system (21), and the flue gas system in a cascade according to its parameter characteristics; The molten salt side of the low temperature steam-molten salt heat exchanger group (2) is connected to the low temperature hot molten salt tank (6) and the cold molten salt tank (7); the low temperature steam-molten salt heat exchanger group (2) The steam side is connected to the steam pipeline from the main steam turbine to the boiler (8), the steam extraction pipeline of the main steam turbine, the heat recovery system, the auxiliary steam pipeline (20), the heating system (21), and the flue gas system, from the main steam turbine to the boiler (8) The heat of the steam in the steam pipeline or the steam extraction pipeline of the main steam turbine is released to the cold molten salt pumped from the cold molten salt tank (7), so that it becomes a low temperature hot molten salt, and is stored in the low temperature hot molten salt tank (6), where it is placed. The heated steam is used for the heat recovery system, the auxiliary steam pipeline (20), the heating system (21), and the flue gas system in steps according to its parameter characteristics; The molten salt side of the high temperature molten salt-steam heat exchanger group (3) is connected to a high temperature hot molten salt tank (5), a low temperature hot molten salt tank (6), and a cold molten salt tank (7); the high temperature molten salt - The steam side of the steam heat exchanger group (3) is connected to the steam extraction pipeline of the main steam turbine, the heat recovery system, the heating system (21), the small steam turbine of the feed water pump (17), and the small steam turbine of the induced draft fan (33), and the high temperature hot melt The heat stored in the high-temperature hot molten salt in the salt tank (5) is released to the steam from the extraction steam pipe of the main steam turbine, and its parameters are improved, and are used for the heat recovery system, the heating system (21), and the small feed pump according to its parameter characteristics. The steam turbine (17) and the small induced draft fan steam turbine (33), the molten salt after exothermic storage is stored in a low-temperature hot molten salt tank (6) or a cold molten salt tank (7) according to its temperature step; The molten salt side of the low temperature molten salt-steam heat exchanger group (4) is connected to the low temperature hot molten salt tank (6) and the cold molten salt tank (7); the low temperature molten salt-steam heat exchanger group (4) The steam side is connected to the main steam turbine extraction pipeline, the heat recovery system, the heating system (21), the auxiliary steam pipeline (20), and the flue gas system to release the heat stored in the low-temperature molten salt tank (6) The steam from the steam extraction pipeline of the main steam turbine has its parameters improved, and is used for the heat recovery system, the heating system (21), the auxiliary steam pipeline (20), the flue gas system and the molten salt after exothermic steps according to its parameter characteristics. Store in cold molten salt tank (7). 2. The thermal power unit molten salt cascade storage and discharge energy peak regulation system according to claim 1 is characterized in that: the high temperature steam-molten salt heat exchanger group (1) can be one heat exchanger or multiple heat exchangers are connected in series or in parallel; the low temperature steam-molten salt heat exchanger group (2) may be one heat exchanger, or multiple heat exchangers may be connected in series or in parallel; the high temperature molten salt-steam heat exchange The heat exchanger group (3) may be one heat exchanger, or multiple heat exchangers may be connected in series or in parallel; the low-temperature molten salt-steam heat exchanger group (4) may be one heat exchanger, or multiple heat exchangers The heat exchangers are connected in series or in parallel. 3. The thermal power unit molten salt cascade storage and discharge energy peak regulation system according to claim 1, is characterized in that: the described heat recovery system comprises the low-pressure heater module (15), the deaerator (16), the high-pressure heater module (15) connected successively A heater module (18), a condenser (13) and a condensate water pump (14) are sequentially connected between the main steam turbine and the low-pressure heater module (15); the deaerator (16), the high-pressure heater module A feedwater pump (19) is connected between (18), the feedwater pump (19) is driven by a feedwater pump small steam turbine (17), and the feedwater pump small steam turbine (17) is connected to a high temperature molten salt-steam heat exchanger group ( 3) The steam side is connected; the high-pressure heater module (18) is connected to the economizer (22) of the boiler (8) through the feed water pipeline, and the low-pressure heater module (15) and the deaerator (16) are respectively connected to the steam side of the high temperature steam-molten salt heat exchanger group (1) and the low temperature steam-molten salt heat exchanger group (2); the high pressure heater modules (18) are respectively connected to the high temperature steam-molten salt heat exchanger The steam side of the group (1), the low temperature steam-molten salt heat exchanger group (2), the high temperature molten salt-steam heat exchanger group (3), and the low temperature molten salt-steam heat exchanger group (4) are connected. 4. The thermal power unit molten salt cascade storage and discharge energy peak regulation system according to claim 1, is characterized in that: described smoke and wind system comprises smoke system and wind system, and described smoke system is from the air preheater of boiler (8) (31) After that, the dust collector (32), the induced draft fan (34), the desulfurization tower (35), the flue gas heater (36) and the chimney (37) are sequentially connected through the flue, and the induced draft fan (34) is driven by the induced draft fan. The small steam turbine (33) is driven, and the small steam turbine (33) of the induced draft fan is connected to the steam side of the high-temperature molten salt-steam heat exchanger group (3); the air system includes a primary air heater (27), a supply air heater A blower (28), a primary blower (29), and a blower (30), the primary blower (29) and blower (30) are respectively connected to the primary air heater (27), the blower through the primary air duct and the blower duct. The air heater (28) is then connected to the boiler (8) through a primary air duct and an air supply duct. The primary air heater (27), the air supply heater (28), and the flue gas heater (36) They are respectively connected to the steam side of the high temperature steam-molten salt heat exchanger group (1), the low temperature steam-molten salt heat exchanger group (2), and the low temperature molten salt-steam heat exchanger group (4). 5. The molten salt cascade storage and discharge energy peak regulation system for thermal power units according to claim 1, wherein the thermal power unit comprises a non-reheat unit, a primary reheat unit, and a secondary reheat unit. 6. The thermal power unit molten salt cascade storage and discharge energy peak shaving system according to claim 5, is characterized in that: when the thermal power unit is a non-reheat unit, the main steam turbine comprises a main steam turbine high pressure cylinder (10) and a main steam turbine. The steam turbine low pressure cylinder (12), the main steam turbine high pressure cylinder (10) is connected to the superheater (24) of the boiler (8) through the main steam pipeline; the steam side of the high temperature steam-molten salt heat exchanger group (1) is connected to the superheater (24) of the boiler (8). The main steam pipeline is connected, and the heat of the steam from the main steam pipeline is released to the cold molten salt pumped from the cold molten salt tank (7); the steam side of the low temperature steam-molten salt heat exchanger group (2) is connected to the high pressure of the main steam turbine. The steam extraction pipes of the cylinder (10) are connected, and the heat of the steam from the steam extraction pipe of the main steam turbine high-pressure cylinder (10) is released to the cold molten salt pumped out from the cold molten salt tank (7); the high temperature molten salt-steam heat exchange The steam side of the steam generator group (3) is connected to the steam extraction pipeline of the low-pressure cylinder (12) of the main steam turbine, and the heat stored in the high-temperature molten salt tank (5) is released to the extraction pipeline of the low-pressure cylinder (12) of the main steam turbine. The steam coming from; the steam side of the low-temperature molten salt-steam heat exchanger group (4) is connected with the steam extraction pipeline of the low-pressure cylinder (12) of the main steam turbine, and the low-temperature hot molten salt in the low-temperature hot molten salt tank (6) is stored. The heat is released to the steam from the steam extraction pipeline of the main steam turbine low pressure cylinder (12); the main steam turbine low pressure cylinder (12) is connected with the condenser (13). 7. The thermal power unit molten salt cascade storage and discharge energy peak shaving system according to claim 5, is characterized in that: when the thermal power unit is a primary reheat unit, the main steam turbine comprises a main steam turbine high pressure cylinder (10), a main steam turbine The steam turbine medium pressure cylinder (11) and the main steam turbine low pressure cylinder (12), the main steam turbine high pressure cylinder (10) respectively pass through the main steam pipeline and the low temperature reheat steam pipeline and the superheater (24) and the primary reheating of the boiler (8). The primary reheater (25) is then connected to the intermediate pressure cylinder (11) of the main steam turbine through the high temperature reheat steam pipeline; the high temperature steam-molten salt heat exchanger group (1) is on the steam side It is connected with the main steam pipeline and the high temperature reheat steam pipeline, and the heat of the steam from the main steam pipeline or the high temperature reheat steam pipeline is released to the cold molten salt pumped from the cold molten salt tank (7); the low temperature steam-molten salt exchange The steam side of the heater group (2) is connected to the low-temperature reheat steam pipeline and the extraction pipeline of the main steam turbine high-pressure cylinder (10) to release the heat from the low-temperature reheat steam pipeline or the extraction pipeline of the main turbine high-pressure cylinder (10). The cold molten salt pumped from the cold molten salt tank (7); the steam extraction pipeline of the steam side of the high temperature molten salt-steam heat exchanger group (3) and the medium pressure cylinder (11) of the main steam turbine and the low pressure cylinder of the main steam turbine (12) are connected to the steam extraction pipes, and the heat stored in the high temperature hot molten salt tank (5) is released to the steam extraction pipe of the middle pressure cylinder (11) of the main steam turbine or the steam extraction pipe of the low pressure cylinder (12) of the main steam turbine. steam; the steam side of the low-temperature molten salt-steam heat exchanger group (4) is connected with the steam extraction pipeline of the middle-pressure cylinder (11) of the main steam turbine and the extraction steam pipeline of the low-pressure cylinder (12) of the main steam turbine, and the low-temperature heat The heat stored in the molten salt tank (6) at low temperature is released to the steam from the extraction pipeline of the intermediate pressure cylinder (11) of the main turbine or the extraction pipeline of the low pressure cylinder (12) of the main turbine; the low pressure cylinder (12) of the main turbine ) is connected to the condenser (13). 8. The thermal power unit molten salt cascade storage and discharge energy peak shaving system according to claim 5, is characterized in that: when the thermal power unit is a secondary reheat unit, the main steam turbine comprises a main steam turbine super-high pressure cylinder (9) , the main steam turbine high pressure cylinder (10), the main steam turbine medium pressure cylinder (11) and the main steam turbine low pressure cylinder (12), the main steam turbine ultra-high pressure cylinder (9) passes through the main steam pipeline and the primary low temperature reheat steam pipeline and the boiler respectively. The superheater (24) and the primary reheater (25) of (8) are connected; the main steam turbine high pressure cylinder (10) is connected to the boiler (8) through the primary high temperature reheat steam pipeline and the secondary low temperature reheat steam pipeline respectively. The primary reheater (25) and the secondary reheater (26) are connected; the intermediate pressure cylinder (11) of the main steam turbine is connected to the secondary reheater (26) of the boiler (8) through a secondary high temperature reheat steam pipeline connected; the steam side of the high-temperature steam-molten salt heat exchanger group (1) is connected to the main steam pipeline, the primary high-temperature reheated steam pipeline, and the secondary high-temperature reheated steam pipeline, and the main steam pipeline or the primary high-temperature reheated steam pipeline Or the heat of the secondary high temperature reheat steam pipeline steam is released to the cold molten salt pumped from the cold molten salt tank (7); the steam side of the low temperature steam-molten salt heat exchanger group (2) is connected to the primary low temperature reheat steam The pipeline, the secondary low-temperature reheat steam pipeline, and the extraction pipeline of the main steam turbine high-pressure cylinder (10) are connected, and the steam from the primary low-temperature reheat steam pipeline or the secondary low-temperature reheat steam pipeline or the extraction pipeline of the main turbine high-pressure cylinder (10) is connected. The heat is released to the cold molten salt pumped from the cold molten salt tank (7). The low-pressure cylinder (12) is connected with the steam extraction pipeline, and the heat stored in the high-temperature hot-molten salt tank (5) is released to the steam extraction pipeline of the intermediate-pressure cylinder (11) of the main steam turbine or the extraction steam of the low-pressure cylinder (12) of the main steam turbine The steam from the pipeline; the steam side of the low-temperature molten salt-steam heat exchanger group (4) is connected with the steam extraction pipeline of the middle pressure cylinder (11) of the main steam turbine and the extraction steam pipeline of the low pressure cylinder (12) of the main steam turbine, and the low-temperature hot melt The heat stored in the low temperature hot molten salt in the salt tank (6) is released to the steam from the extraction pipeline of the intermediate pressure cylinder (11) of the main turbine or the extraction pipeline of the low pressure cylinder (12) of the main turbine; the low pressure cylinder (12) of the main turbine Connected to the condenser (13).

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