CN115573874A

CN115573874A - Molten salt photo-thermal power generation system operating all day and operating method thereof

Info

Publication number: CN115573874A
Application number: CN202211164362.5A
Authority: CN
Inventors: 郭强; 季钰冲; 杨财毛; 朱同; 张昊骅
Original assignee: Changzhou University
Current assignee: Changzhou University
Priority date: 2022-09-23
Filing date: 2022-09-23
Publication date: 2023-01-06

Abstract

The invention provides a molten salt photo-thermal power generation system operating all day long and an operating method thereof. When the fused salt in the low-temperature fused salt tank reaches a set liquid level height, the electric heater pipeline valve is opened, the low-temperature fused salt is conveyed to the electric heater through the fused salt pump to be heated, and then is communicated to the high-temperature fused salt tank to continue to circulate the fused salt system; the electric heater uses electricity from wind energy to generate electricity, so that the energy utilization rate is improved, and the generated energy in a period is increased. So far, the operation of the molten salt photo-thermal power generation system which operates all day long is completed.

Description

Molten salt photo-thermal power generation system operating all day and operating method thereof

Technical Field

The invention belongs to the technical field of new energy, and particularly relates to a fused salt photo-thermal power generation operation system which operates all day long.

Background

Under the drive of the 'double-carbon' target, the development and utilization of renewable new energy sources become a necessary choice for the continuous and stable operation of the Chinese power system.

Solar energy is an inexhaustible renewable clean energy source, so that the solar power generation technology is widely popularized and used all over the world, and the mature solar power generation technology in the market at present comprises photovoltaic power generation and photo-thermal power generation.

Photovoltaic power generation can only generate electricity under the illumination condition, so photovoltaic power generation can only work daytime, can not generate electricity evening, and the power consumption is many night when resident and industrial power consumption are ordinary, and photovoltaic power generation's working property does not conform to our habits and customs, can not satisfy resident and industrial power consumption continuous stable power consumption demand.

As a new energy power generation technology with flexibly adjustable output power, the photo-thermal power generation technology fills up short plates with insufficient photovoltaic power generation, and can meet the requirements of safe and stable power supply of a power system. However, the problems of short energy storage time, large energy consumption of a molten salt reheating system and the like also exist in the photo-thermal power generation, and the development of the photo-thermal power generation technology is restricted to a certain extent, so that the optimization of the photo-thermal power generation system becomes an industrial focus.

Disclosure of Invention

The invention aims to overcome the defects in the prior art, and provides a full-day operation system and a full-day operation method for fused salt photo-thermal power generation, which can utilize fused salt heat exchange to continuously generate power based on solar energy.

In order to achieve the purpose, the invention is realized by adopting the following technical scheme:

in a first aspect, the invention provides a molten salt photo-thermal power generation operation system which operates all day long, comprising a solar heat collection system, a sustainable molten salt heat exchange and storage system and a multi-energy coupling power generation system;

the sustainable molten salt heat exchange and storage system is respectively connected with the solar heat collection system and the multi-energy coupling power generation system.

Furthermore, the solar heat collection system comprises a groove type heat collection mirror field, a low-temperature molten salt transmission pipe and a high-temperature molten salt transmission pipe; the sustainable molten salt heat exchange and storage system comprises a low-temperature molten salt tank and a high-temperature molten salt tank;

the trough type heat collecting mirror field is provided with a molten salt transmission pipe, and the input end and the output end are respectively connected with the low-temperature molten salt transmission pipe and the high-temperature molten salt transmission pipe; and the low-temperature molten salt transmission pipe and the high-temperature molten salt transmission pipe are respectively connected to a low-temperature molten salt tank and a high-temperature molten salt tank of the sustainable molten salt heat exchange and storage system.

Further, the sustainable molten salt heat exchange and storage system comprises an electric heater, a high-temperature molten salt tank, a molten salt pump, a molten salt steam generator, a feed water preheater, a low-temperature molten salt tank, a valve I, a valve II, a valve III and a valve IV;

the input end of the high-temperature molten salt tank is respectively connected with the electric heater and the high-temperature molten salt transmission pipe, and the output end of the high-temperature molten salt tank is connected with the molten salt steam generator;

the input end of the low-temperature molten salt tank is connected with the feed water preheater, and the output end of the low-temperature molten salt tank is respectively connected with the electric heater and the low-temperature molten salt transmission pipe;

the high-temperature molten salt tank, the electric heater and the low-temperature molten salt tank form a series structure; the molten salt steam generator is connected with the feed water preheater in series;

the molten salt pump is arranged in the sustainable molten salt heat exchange and storage system and used for providing pumping force for molten salt;

the valve I is arranged between the low-temperature molten salt transmission pipe and the low-temperature molten salt tank and used for controlling the input of low-temperature molten salt to the groove type heat collecting mirror field, and is opened when the illumination is sufficient and closed when the illumination is insufficient;

the valve II is arranged between the electric heater and the low-temperature molten salt tank and used for controlling the input of low-temperature molten salt to the electric heater, the valve II is opened when the molten salt in the low-temperature molten salt tank reaches a set liquid level, and the valve II is closed when the illumination is sufficient;

the valve III is arranged between the feed water preheater and the low-temperature molten salt tank and is used for controlling the input of low-temperature molten salt to the low-temperature molten salt tank;

and the valve IV is arranged between the electric heater and the high-temperature molten salt tank and used for controlling the flow of the heating molten salt into the high-temperature molten salt tank, the valve IV is opened when the molten salt in the low-temperature molten salt tank reaches a set liquid level, and the valve IV is closed when the illumination is sufficient.

Furthermore, the molten salt pumps are respectively arranged between the high-temperature molten salt transmission pipe and the high-temperature molten salt tank, between the high-temperature molten salt tank and the molten salt steam generator, between the electric heater and the low-temperature molten salt tank, between the low-temperature molten salt tank and the low-temperature molten salt transmission pipe, and between the low-temperature molten salt tank and the water supply preheater.

Further, the electric heater comprises a high-temperature molten salt outlet connecting pipe, an electric heater shell, a molten salt pipe, an electric heating wire and a low-temperature molten salt inlet connecting pipe;

the low-temperature molten salt inlet connecting pipe and the high-temperature molten salt outlet connecting pipe are respectively positioned at the input end and the output end of the molten salt pipe; the electric heating wire connected with the wind power generation control assembly surrounds the outer side of the molten salt pipe;

further, the high-temperature molten salt tank comprises a metal outer plate layer, a heat preservation plate layer, a temperature sensor, a control panel, a floating ball type liquid level sensor, a refractory brick, a heat insulation rock wool plate, a cooling ventilation opening, an inner tank heat-resistant partition plate, a vacuum heat insulation layer, a ceramic fiber heat preservation layer and a concrete base;

the high-temperature molten salt tank is divided into an upper part, a middle part and a lower part; the upper part is a vacuum cavity between the metal outer plate layer and the heat insulation plate layer; the middle part is a multi-layer surrounding cavity, and the hot-melt-resistant salt cavity, the inner tank heat-resistant partition plate, the vacuum heat-insulating layer, the ceramic fiber heat-insulating layer and the metal outer plate layer are respectively arranged from inside to outside; the lower part is tightly attached with a refractory brick and a heat insulation rock wool plate; the bottom is provided with a concrete base with a cooling vent;

a temperature sensor and a floating ball type liquid level sensor are arranged in the heat-resistant molten salt cavity on the inner side of the heat-resistant partition plate of the inner tank, and the temperature sensor and the floating ball type liquid level sensor are externally connected with a control panel for monitoring and controlling the two sensors;

the internal structures of the low-temperature molten salt tank and the high-temperature molten salt tank are completely the same.

Further, the molten salt steam generator comprises a high-temperature molten salt inlet, a medium-temperature molten salt outlet, a high-temperature steam outlet, a steam generator shell, a heat insulation layer, a mesh plate, a high-temperature molten salt box, a molten salt pipe, a radiating fin, a medium-temperature molten salt box and a water inlet;

the heat-insulating layer is arranged in the steam generator shell; a screen plate is arranged at the upper part of the inner cavity of the steam generator shell;

one side of the high-temperature molten salt inlet is connected with a heat-resistant molten salt cavity of the high-temperature molten salt tank through a molten salt pump, and the other side of the high-temperature molten salt inlet is sequentially connected with a high-temperature molten salt tank, a molten salt pipe, a medium-temperature molten salt tank and a medium-temperature molten salt outlet;

the multiple groups of radiating fins are uniformly distributed on the molten salt pipe;

the medium-temperature molten salt outlet and the water inlet are respectively connected to the medium-temperature molten salt inlet and the high-temperature water outlet of the feed water preheater through a molten salt pipeline and a water pump.

Further, the feed water preheater comprises a medium-temperature molten salt inlet, a low-temperature molten salt outlet, a high-temperature water outlet, a preheater shell, a molten salt pipe and a low-temperature water inlet;

the molten salt pipe is arranged in the preheater shell;

one end of the molten salt pipe is connected with the medium-temperature molten salt outlet, and the other end of the molten salt pipe is connected to the low-temperature molten salt tank through a molten salt pump and a valve III;

and the high-temperature water outlet and the low-temperature water inlet are respectively connected to the molten salt steam generator and a condensation water tank of the multi-energy coupling power generation system.

Further, the multi-energy coupling power generation system comprises a water pump, a condensation water tank, a steam turbine, a power generator, a transformer substation, a power grid, a cooling tower and a water pipeline;

the steam turbine, the generator, the transformer substation, the power grid, the cooling tower and the condensation water tank are sequentially connected in series; the input end of the steam turbine is connected to a molten salt steam generator of the sustainable molten salt heat exchange and storage system through a water pump; the output end of the condensation water tank is connected to a feed water preheater of the sustainable molten salt heat exchange and storage system through a water pump.

In a second aspect, the present invention provides a method of operating a molten salt solar thermal power generation operating system operating throughout the day as described in the first aspect, comprising:

when the whole system operates, the trough type heat collecting mirror field condenses light onto the molten salt pipeline, low-temperature molten salt in the pipeline is heated, and the molten salt pump conveys the heated high-temperature molten salt to a heat-resistant molten salt cavity of the high-temperature molten salt tank through a high-temperature molten salt transmission pipe;

the floating ball type liquid level sensor in the heat-resistant molten salt cavity controls the liquid level height of the molten salt in the cavity, the temperature sensor monitors the temperature in the cavity, and the two sensors are both externally connected with a control panel for operation and control; the heat-insulation plate layer, the heat-insulation rock wool plate, the inner tank heat-resistant partition plate, the vacuum heat-insulation layer and the ceramic fiber heat-insulation layer are all heat-insulation of a heat-resistant molten salt cavity, and play a role in effective multiple heat insulation; the concrete base provided with the cooling ventilation openings enables the cavity to be placed more stably, meanwhile, the ground is protected, and damage to the ground caused by high temperature is avoided; when the liquid level of the floating ball type liquid level sensor in the low-temperature molten salt tank reaches a set liquid level value, opening a valve II and a valve IV, opening a molten salt pump at the output end of the high-temperature molten salt tank, conveying low-temperature molten salt to an electric heater for heating, and introducing high-temperature molten salt in a heat-resistant molten salt cavity of the high-temperature molten salt tank into a high-temperature molten salt tank of a molten salt steam generator through a high-temperature molten salt inlet; at the moment, the multi-energy coupling power generation system starts to work;

the water pump firstly enters a certain amount of water originally stored in the condensate water tank into the feed water preheater from the low-temperature water inlet, and then the certain amount of water is conveyed to the water inlet of the molten salt steam generator from the high-temperature water outlet, and after a certain time, the water is filled in the molten salt steam generator to fully exchange heat with the high-temperature molten salt;

when high-temperature molten salt in the high-temperature molten salt box passes through a molten salt pipe with radiating fins, water in the cavity absorbs heat to cool the high-temperature molten salt in the molten salt pipe, the high-temperature molten salt in the molten salt pipe is collected in a medium-temperature molten salt box after being fully absorbed by water outside the molten salt pipe and cooled to become medium-temperature molten salt, and the medium-temperature molten salt is led to the molten salt pipe of the water supply preheater through a medium-temperature molten salt inlet from a medium-temperature molten salt outlet; the water in the feed water preheater exchanges heat with the molten salt in the molten salt pipe, and the water absorbs heat to cool the medium-temperature molten salt in the pipe into low-temperature molten salt; low-temperature molten salt in a molten salt pipe of the feed water preheater is communicated to a hot-melt-resistant salt cavity in a low-temperature molten salt tank through a molten salt pump and a valve III;

if the sunlight is sufficient, the valve I opens the low-temperature molten salt in the low-temperature molten salt tank, returns to the groove type heat collecting mirror field through the low-temperature molten salt transmission pipe to absorb heat and raise the temperature to form high-temperature liquid molten salt, and the molten salt is circulated in the pipeline clockwise; if solar energy is insufficient, namely the trough type heat collecting mirror field cannot provide enough fused salt heat, the valve I is closed, the high-temperature fused salt tank continues to convey high-temperature fused salt to the fused salt steam generator, the high-temperature fused salt stored in the high-temperature fused salt tank is enough for normal power generation of a system for hours, when the fused salt in the low-temperature fused salt tank reaches a set liquid level height, the valve II and the valve IV are opened, and the fused salt in the low-temperature fused salt tank is conveyed to a fused salt pipe in the electric heater from a low-temperature fused salt inlet connecting pipe through a fused salt pump; kinetic energy of a fan in the wind power generation module is transferred to the wind power generation control assembly and converted into electric energy; the electric heating wires are surrounded outside the fused salt pipe and are powered by the wind power generation control assembly, and heat generated by the electric heating wires is used for heating low-temperature fused salt in the fused salt pipe to form high-temperature fused salt and then is introduced into the high-temperature fused salt tank, so that effective heat assistance is achieved when solar energy is insufficient, and the system can be ensured to operate continuously;

the water pump sequentially absorbs heat of water originally stored in the condensate tank through a water supply preheater and a molten salt steam generator to form high-temperature steam, the high-temperature steam is conveyed to the steam turbine through a water conveying pipeline to be converted into electric energy from internal energy, and the electric energy is fully condensed into liquid water through the cooling tower to return to the condensate tank, so that steam power generation and clockwise pipeline circulation of the water are completed; the electric energy generated by the generator supplies power for our daily life through a transformer substation and a power grid; so far, the operation of the molten salt photo-thermal power generation system which operates all day long is completed.

Compared with the prior art, the invention has the following beneficial effects:

1. when the sustainable molten salt heat exchange and storage system runs under the condition of insufficient illumination, the low-temperature molten salt pipeline valve is closed, the high-temperature molten salt tank can continuously convey the molten salt to the gas turbine, the high-temperature molten salt stored in the tank is enough for normal power generation of the system for hours, when the molten salt in the low-temperature molten salt tank reaches the set liquid level height, the electric heater pipeline valve is opened, and the low-temperature molten salt is conveyed to the electric heater through the molten salt pump to be heated and then is communicated to the high-temperature molten salt tank to continuously carry out molten salt system circulation;

2. the electric heater of the invention uses electricity from wind energy to generate electricity, thereby not only improving the energy utilization rate, but also increasing the generated energy in the period. So far, the operation of the molten salt photo-thermal power generation system which operates all day long is completed.

Drawings

FIG. 1 is a block diagram of an electric heater of the present invention;

FIG. 2 is a block diagram of the molten salt steam generator of the present invention;

FIG. 3 is a schematic of the feedwater preheater of the present invention;

FIG. 4 is a structural view of a molten salt tank of the present invention;

FIG. 5 is a schematic view of a wind power module of the present invention;

FIG. 6 is a schematic view of the molten salt solar-thermal power generation system connection of the present invention.

In the figure: A. a solar energy collection system; B. a sustainable molten salt heat exchange and storage system; C. a multi-energy coupling power generation system;

a1, a groove type heat collecting mirror field; a2, conveying a low-temperature molten salt; a3, conveying a high-temperature molten salt; b1, an electric heater; b11, a high-temperature molten salt outlet connecting pipe; b12, an electric heater shell; b13, an electric heater molten salt pipe; b14, an electric heating wire; b15, connecting a low-temperature molten salt inlet; b2, a high-temperature molten salt tank; b21, a metal outer plate layer; b22, a heat preservation plate layer; b23, a temperature sensor; b24, a control panel; b25, a floating ball type liquid level sensor; b26, refractory bricks; b27, heat-insulating rock wool boards; b28, a cooling vent; b29, heat-resistant partition plates of the inner tank; b210, a vacuum heat insulation layer; b211, a ceramic fiber heat-insulating layer; b212, a concrete base; b213, a heat-resistant molten salt cavity; b3, a molten salt pump; b4, a molten salt steam generator; b41, a high-temperature molten salt inlet; b42, medium-temperature molten salt outlet; b43, a high-temperature steam outlet; b44, a steam generator shell; b45, a heat-insulating layer; b46, a screen plate; b47, a high-temperature molten salt box; b48, a steam generator molten salt pipe; b49, radiating fins; b410, a medium-temperature molten salt box; b411 and a water inlet; b5, a feed water preheater; b51, medium-temperature molten salt inlet; b52, a low-temperature molten salt outlet; b53, a high-temperature water outlet; b54, a preheater shell; b55, a preheater molten salt pipe; b56, a low-temperature water inlet; b6, a low-temperature molten salt tank; b7, a valve I; b8, a valve II; b9, a valve III; b10, a valve IV; c1, a water pump; c2, a condensation water tank; c3, a steam turbine; c4, a generator; c5, a transformer substation; c6, a power grid; c7, a cooling tower; c8, a water conveying pipeline; c9, a wind power generation module; c91, a fan; c92, wind power generation control components.

Detailed Description

The invention is further described below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.

In the description of the present embodiment, it should be noted that, as the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. appear, the indicated orientation or positional relationship thereof is based on the orientation or positional relationship shown in the drawings, and is only for convenience of describing the present embodiment and simplifying the description, but does not indicate or imply that the referred device or element must have a specific orientation, be configured and operated in a specific orientation, and thus, cannot be construed as limiting the present embodiment.

The first embodiment is as follows:

the invention provides a molten salt photo-thermal power generation operation system which operates all day long, and as shown in fig. 6, the system mainly comprises a solar heat collection system A, a sustainable molten salt heat exchange and storage system B and a multi-energy coupling power generation system C. The sustainable molten salt heat exchange and storage system B is used as a bridge and is connected in series with the solar heat collection system A and the multi-energy coupling power generation system C to form the whole device.

The solar heat collection system A consists of a groove type heat collection mirror field A1, a low-temperature molten salt transmission pipe A2 and a high-temperature molten salt transmission pipe A3. The groove type heat collecting mirror field A1 carries a molten salt transmission pipe, and the input end and the output end are respectively connected with a low-temperature molten salt transmission pipe A2 and a high-temperature molten salt transmission pipe A3; and is respectively connected to a low-temperature molten salt tank B6 and a high-temperature molten salt tank B2 of the sustainable molten salt heat exchange and storage system B through a low-temperature molten salt transmission pipe A2 and a high-temperature molten salt transmission pipe.

The sustainable molten salt heat exchange and storage system B consists of an electric heater B1, a high-temperature molten salt tank B2, a molten salt pump B3, a molten salt steam generator B4, a feed water preheater B5, a low-temperature molten salt tank B6, a valve IB 7, a valve IIB 8, a valve IIIB 9 and a valve IVB 10. The input end of the high-temperature molten salt tank B2 is connected with the high-temperature molten salt transmission pipe A3 and the electric heater B1, and the output end is connected with the molten salt steam generator B4; the input end of a low-temperature molten salt tank B6 is connected with a water supply preheater B5, and the output end of the low-temperature molten salt tank B6 is respectively connected with a low-temperature molten salt transmission pipe A2 and an electric heater B1; the high-temperature molten salt tank B2, the electric heater B1 and the low-temperature molten salt tank B6 form a series structure; and the molten salt steam generator B4 and the feed water preheater B5 are also connected in series.

In the sustainable molten salt heat exchange and storage system B, as shown in fig. 1, the electric heater B1 is composed of a high-temperature molten salt outlet connection pipe B11, an electric heater shell B12, a molten salt pipe B13, an electric heating wire B14, and a low-temperature molten salt inlet connection pipe B15. The low-temperature fused salt inlet connecting pipe B15 and the high-temperature fused salt outlet connecting pipe B11 are respectively positioned at the input end and the output end of the fused salt pipe B13; an electric heating wire B14 connected with the wind power generation control component C92 is encircled outside the fused salt pipe B13.

As shown in fig. 4, the high-temperature molten salt tank B2 is composed of a metal outer plate layer B21, a heat-insulating plate layer B22, a temperature sensor B23, a control panel B24, a floating ball type liquid level sensor B25, a refractory brick B26, a heat-insulating rock wool plate B27, a cooling ventilation opening B28, an inner tank heat-resistant partition B29, a vacuum heat-insulating layer B210, a ceramic fiber heat-insulating layer B211 and a concrete foundation B212. The high-temperature molten salt tank B2 is mainly divided into an upper part, a middle part and a lower part; the upper part is a vacuum cavity between the metal outer plate layer B21 and the heat-insulating plate layer B22; the middle part is a multi-layer surrounding cavity body which is a heat-resistant molten salt cavity B213, an inner tank heat-resistant clapboard B29, a vacuum heat-insulating layer B210, a ceramic fiber heat-insulating layer B211 and a metal outer plate layer B21 from inside to outside; the lower part is tightly attached with a firebrick B26 and a heat insulation rock wool board B27; the bottom is composed of a concrete base B212 with a cooling vent B28; a temperature sensor B23 and a floating ball type liquid level sensor B25 are arranged in the hot-melt resistant salt cavity 213 at the inner side of the inner tank heat-resistant clapboard B29, and are externally connected with a control panel B24 to monitor and control the two sensors; the internal structures of the low-temperature molten salt tank B6 and the high-temperature molten salt tank B2 are completely the same.

As shown in fig. 2, the molten salt steam generator B4 is composed of a high-temperature molten salt inlet B41, a medium-temperature molten salt outlet B42, a high-temperature steam outlet B43, a steam generator shell B44, an insulating layer B45, a mesh plate B46, a high-temperature molten salt tank B47, a molten salt pipe B48, a heat dissipation fin B49, a medium-temperature molten salt tank B410 and a water inlet B411. An insulating layer B45 is arranged in the steam generator shell B44; the upper part of the cavity is provided with a screen 46; one side of the high-temperature molten salt inlet B41 is connected with a heat-resistant molten salt cavity B213 of the high-temperature molten salt tank B2 through a molten salt pump B3, and the other side is sequentially connected with a high-temperature molten salt tank B47, a molten salt pipe B48, a medium-temperature molten salt tank B410 and a medium-temperature molten salt outlet B42; a plurality of groups of radiating fins B49 are uniformly distributed on the fused salt pipe B48; the medium-temperature molten salt outlet B42 and the water inlet B411 are respectively connected to a medium-temperature molten salt inlet B51 and a high-temperature water outlet B53 of a feed water preheater B5 through a molten salt pipeline and a water pump C1.

As shown in fig. 3, the feed water preheater B5 is composed of a medium-temperature molten salt inlet B51, a low-temperature molten salt outlet B52, a high-temperature water outlet B53, a preheater housing B54, a molten salt pipe B55, and a low-temperature water inlet B56. One end of a molten salt pipe B55 in the preheater shell B54 is connected with the medium-temperature molten salt outlet B42, and the other end is connected with a low-temperature molten salt tank B6 through a molten salt pump B3 and a valve IIIB 9; the high-temperature water outlet B53 and the low-temperature water inlet B56 are respectively connected to a molten salt steam generator B4 and a condensed water tank C2 of the multi-energy coupling power generation system C through water pumps C1 of respective pipelines.

The multi-energy coupling power generation system C consists of a water pump C1, a condensation water tank C2, a steam turbine C3, a generator C4, a transformer substation C5, a power grid C6, a cooling tower C7 and a water pipeline C8. The steam turbine C3, the generator C4, the transformer substation C5, the power grid C6, the cooling tower C7 and the condensation water tank C2 are sequentially connected in series; the input end of the steam turbine C3 is connected to a molten salt steam generator B4 of the sustainable molten salt heat exchange and storage system B through a water pump C1; the output end of the condensation water tank C2 is connected to a feed water preheater B5 of the sustainable molten salt heat exchange and storage system B through a water pump C1.

The implementation principle is as follows: when the whole system operates, the groove type heat collecting mirror field A1 condenses light onto the molten salt pipeline, low-temperature molten salt in the pipeline is heated, and the high-temperature molten salt pump B3 conveys the heated high-temperature molten salt to the heat-resistant molten salt cavity B213 of the high-temperature molten salt tank B2 through the high-temperature molten salt transmission pipe A3.

A floating ball type liquid level sensor B25 in the hot-melt-resistant salt cavity B213 controls the height of the liquid level of the molten salt in the cavity, a temperature sensor B23 monitors the temperature in the cavity, and the two sensors are externally connected with a control panel B24 for control.

The heat preservation plate layer B22, the heat insulation rock wool plate B27, the inner tank heat-resistant partition plate B29, the vacuum heat insulation layer B210 and the ceramic fiber heat preservation layer B211 are all heat insulation of a hot melt resistant salt cavity B213, and play a role in effective multiple heat preservation.

The concrete base B212 with the cooling ventilation opening B28 enables the cavity to be placed more stably, meanwhile, the ground is protected, and damage to the ground caused by high temperature is avoided.

When the liquid level of a floating ball type liquid level sensor B25 in a low-temperature molten salt tank B6 reaches a set liquid level value, a valve IIB 8 and a valve IVB 10 are opened, a molten salt pump B3 at the output end of a high-temperature molten salt tank B2 is opened, low-temperature molten salt is sent to an electric heater B1 for heating, high-temperature molten salt in a heat-resistant molten salt cavity B213 of the high-temperature molten salt tank B2 is communicated into a high-temperature molten salt tank B47 of a molten salt steam generator B4 through a high-temperature molten salt inlet B41, and at the moment, the multifunctional coupling power generation system C starts to work.

The water pump C1 firstly enters a certain amount of water originally stored in the condensate tank C2 into the feed water preheater B5 through the low-temperature water inlet B56, and then is conveyed to the water inlet B411 of the molten salt steam generator B4 from the high-temperature water outlet B53, and after a certain time, the inside of the molten salt steam generator B4 is filled with water to fully exchange heat with high-temperature molten salt.

When the high-temperature molten salt in the high-temperature molten salt box B47 passes through a molten salt pipe B48 with a radiating fin B49, water in the cavity absorbs heat to cool the high-temperature molten salt in the molten salt pipe B48, the high-temperature molten salt in the molten salt pipe B48 is collected in a medium-temperature molten salt box B10 after being fully absorbed by water outside the molten salt pipe and cooled to become medium-temperature molten salt, and then the medium-temperature molten salt is led to a molten salt pipe B55 of a feed water preheater B5 through a medium-temperature molten salt inlet B51 from a medium-temperature molten salt outlet B42; water in the feed water preheater B5 exchanges heat with the molten salt in the molten salt pipe B55, and the water absorbs heat to reduce the temperature of the medium-temperature molten salt in the pipe into low-temperature molten salt; and low-temperature molten salt in a molten salt pipe B55 of the feed water preheater B5 is communicated to a hot-melt-resistant salt cavity in a low-temperature molten salt tank B6 through a molten salt pump B3 and a valve IIIB 9.

If the sunlight is sufficient, the valve IB 7 is opened, the low-temperature molten salt in the low-temperature molten salt tank B6 returns to the groove type heat collecting mirror field A1 through the low-temperature molten salt transmission pipe A2 to absorb heat and raise the temperature to be high-temperature liquid molten salt, and the clockwise circulating operation of the molten salt in the pipeline is formed; if solar energy is insufficient, namely the trough type heat collecting mirror field A1 cannot provide enough fused salt heat, the valve IB 7 is closed, the high-temperature fused salt tank B2 continues to convey high-temperature fused salt to the fused salt steam generator B4, the high-temperature fused salt stored in the high-temperature fused salt tank is enough for normal power generation of a system for hours, when the fused salt in the low-temperature fused salt tank reaches a set liquid level height, the valve IIB and the valve IVB 10 are opened, and the fused salt in the low-temperature fused salt tank B6 is conveyed to a fused salt pipe B13 in the electric heater B1 from a low-temperature fused salt inlet connecting pipe B15 through a fused salt pump B3; kinetic energy of a fan C91 in the wind power generation module C9 is transmitted to a wind power generation control assembly C92 and converted into electric energy; the electric heating wire B15 is wound outside the fused salt pipe B13 and is powered by the wind power generation control component C92, and heat generated by the electric heating wire B15 is low-temperature fused salt in the fused salt pipe B13 and is heated into high-temperature fused salt which is then introduced into the high-temperature fused salt tank B2, so that effective heat assistance is achieved when solar energy is insufficient, and the system can operate continuously; fig. 5 shows a wind turbine generator module according to the present embodiment.

The water pump C1 absorbs heat of the water stored in the condensate water tank C2 through the feed water preheater B5 and the molten salt steam generator B4 in turn to form high-temperature steam, the high-temperature steam is conveyed to the steam turbine C3 through the water conveying pipeline C8 to be converted into electric energy from internal energy and cooled at the same time, and the high-temperature steam is fully condensed into liquid water through the cooling tower C7 to return to the condensate water tank C2, so that steam power generation and clockwise pipeline circulation of water are completed; the electric energy generated by the generator C4 supplies power for our daily life through the transformer substation C5 and the power grid C6; thus, the operation of the molten salt photo-thermal power generation system which operates all day long is completed.

Example two:

the embodiment provides an operation method of an operation system of molten salt photo-thermal power generation, which is operated all day long, and based on the operation system of the first embodiment, the operation method comprises the following steps:

when the whole system operates, the groove type heat collecting mirror field A1 condenses light onto the molten salt pipeline, low-temperature molten salt in the pipeline is heated, and the high-temperature molten salt pump B3 conveys the heated high-temperature molten salt to the heat-resistant molten salt cavity B213 of the high-temperature molten salt tank B2 through the high-temperature molten salt transmission pipe A3.

A floating ball type liquid level sensor B25 in the hot-melt-resistant salt cavity B213 controls the liquid level height of molten salt in the cavity, a temperature sensor B23 monitors the temperature in the cavity, and the two sensors are both externally connected with a control panel B24 for control; the heat-preservation plate layer B22, the heat-insulation rock wool plate B27, the inner tank heat-resistant partition plate B29, the vacuum heat-insulation layer B210 and the ceramic fiber heat-preservation layer B211 are all heat-insulated by a hot-melt-resistant salt cavity B213, and play a role in effective multiple heat preservation; the concrete base B212 provided with the cooling ventilation opening B28 enables the cavity to be placed more stably, and meanwhile, the ground is protected, and the ground is prevented from being damaged by high temperature; when the liquid level of a floating ball type liquid level sensor B25 in a low-temperature molten salt tank B6 reaches a set liquid level value, a valve IIB 8 and a valve IVB 10 are opened, a molten salt pump B3 at the output end of a high-temperature molten salt tank B2 is opened, low-temperature molten salt is sent to an electric heater B1 for heating, and high-temperature molten salt in a heat-resistant molten salt cavity B213 of the high-temperature molten salt tank B2 is communicated into a high-temperature molten salt tank B47 of a molten salt steam generator B4 through a high-temperature molten salt inlet B41; at this time, the multi-energy coupling power generation system (C) starts to work.

If the sunlight is sufficient, the valve IB 7 is opened, the low-temperature molten salt in the low-temperature molten salt tank B6 returns to the groove type heat collecting mirror field A1 through the low-temperature molten salt transmission pipe A2 to absorb heat and raise the temperature to be high-temperature liquid molten salt, and the clockwise circulating operation of the molten salt in the pipeline is formed; if solar energy is insufficient, namely the trough type heat collecting mirror field A1 cannot provide enough fused salt heat, the valve IB 7 is closed, the high-temperature fused salt tank B2 continues to convey high-temperature fused salt to the fused salt steam generator B4, the high-temperature fused salt stored in the high-temperature fused salt tank is enough for normal power generation of a system for hours, when the fused salt in the low-temperature fused salt tank reaches a set liquid level height, the valve IIB and the valve IVB 10 are opened, and the fused salt in the low-temperature fused salt tank B6 is conveyed to a fused salt pipe B13 in the electric heater B1 from a low-temperature fused salt inlet connecting pipe B15 through a fused salt pump B3; kinetic energy of a fan C91 in the wind power generation module C9 is transmitted to a wind power generation control assembly C92 and converted into electric energy; the fused salt pipe B13 is externally wound by the electric heating wire B15 and is powered by the wind power generation control component C92, and heat generated by the electric heating wire B15 is low-temperature fused salt in the fused salt pipe B13, is heated to be high-temperature fused salt and then is introduced into the high-temperature fused salt tank B2, so that effective heat assistance when solar energy is insufficient is achieved, and the system can be ensured to be continuously operated.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature, and in the description of the invention, "plurality" means two or more unless explicitly specifically defined otherwise.

In the present invention, unless otherwise specifically stated or limited, the terms "mounted," "connected," "fixed," and the like are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, unless expressly stated or limited otherwise, the recitation of a first feature "on" or "under" a second feature may include the recitation of the first and second features being in direct contact, and may also include the recitation that the first and second features are not in direct contact, but are in contact via another feature between them. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. The first feature being "under," "beneath," and "under" the second feature includes the first feature being directly above and obliquely above the second feature, or simply meaning that the first feature is at a lesser level than the second feature.

In the description herein, reference to the terms "one embodiment," "some embodiments," "an example," "a specific example," or "some examples" or the like means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made in the above embodiments by those of ordinary skill in the art without departing from the principle and spirit of the present invention.

Claims

1. An operating system for fused salt photo-thermal power generation operating all day long is characterized by comprising a solar heat collection system (A), a sustainable fused salt heat exchange and storage system (B) and a multi-energy coupling power generation system (C);

the sustainable molten salt heat exchange and storage system (B) is respectively connected with the solar heat collection system (A) and the multi-energy coupling power generation system (C).

2. The operating system of molten salt solar-thermal power generation operating all day long as claimed in claim 1, wherein the solar heat collection system (a) comprises a trough type heat collection mirror field (A1), a low temperature molten salt transmission pipe (A2), a high temperature molten salt transmission pipe (A3); the sustainable molten salt heat exchange and storage system (B) comprises a low-temperature molten salt tank (B6) and a high-temperature molten salt tank (B2);

the trough type heat collecting mirror field (A1) is provided with a molten salt transmission pipe, and the input end and the output end are respectively connected with the low-temperature molten salt transmission pipe (A2) and the high-temperature molten salt transmission pipe (A3); and the low-temperature molten salt transmission pipe (A2) and the high-temperature molten salt transmission pipe (A3) are respectively connected to a low-temperature molten salt tank (B6) and a high-temperature molten salt tank (B2) of the sustainable molten salt heat exchange and storage system (B).

3. The operating system of molten salt photo-thermal power generation operating all day long according to claim 1, wherein the sustainable molten salt heat exchange and storage system (B) comprises an electric heater (B1), a high-temperature molten salt tank (B2), a molten salt pump (B3), a molten salt steam generator (B4), a water supply preheater (B5), a low-temperature molten salt tank (B6), a valve I (B7), a valve II (B8), a valve III (B9) and a valve IV (B10);

the input end of the high-temperature molten salt tank (B2) is respectively connected with the electric heater (B1) and the high-temperature molten salt transmission pipe (A3), and the output end of the high-temperature molten salt tank (B2) is connected with the molten salt steam generator (B4);

the input end of the low-temperature molten salt tank (B6) is connected with the feed water preheater (B5), and the output end of the low-temperature molten salt tank (B6) is respectively connected with the electric heater (B1) and the low-temperature molten salt transmission pipe (A2);

the high-temperature molten salt tank (B2), the electric heater (B1) and the low-temperature molten salt tank (B6) form a series structure; the molten salt steam generator (B4) and the feed water preheater (B5) are connected in series;

the molten salt pump (B3) is arranged in the sustainable molten salt heat exchange and storage system (B) and is used for providing pumping force for molten salt;

the valve I (B7) is arranged between the low-temperature molten salt transmission pipe (A2) and the low-temperature molten salt tank (B6) and is used for controlling the input of low-temperature molten salt to the groove type heat collecting mirror field (A1), and the valve I (B7) is opened when the illumination is sufficient and closed when the illumination is insufficient;

the valve II (B8) is arranged between the electric heater (B1) and the low-temperature molten salt tank (B6) and is used for controlling the input of low-temperature molten salt to the electric heater (B1), the molten salt in the low-temperature molten salt tank (B6) is opened when reaching a set liquid level, and the molten salt is closed when the illumination is sufficient;

the valve III (B9) is arranged between the feed water preheater (B5) and the low-temperature molten salt tank (B6) and is used for controlling the input of low-temperature molten salt to the low-temperature molten salt tank (B6);

and the valve IV (B10) is arranged between the electric heater (B1) and the high-temperature molten salt tank (B2) and is used for controlling the flow of the heating molten salt into the high-temperature molten salt tank (B2), the molten salt in the low-temperature molten salt tank (B6) is opened when reaching a set liquid level, and the molten salt is closed when the illumination is sufficient.

4. The operating system of molten salt solar-thermal power generation operating all day long according to claim 3, wherein the molten salt pumps (B3) are plural and are respectively installed between the high-temperature molten salt transmission pipe (A3) and the high-temperature molten salt tank (B2), between the high-temperature molten salt tank (B2) and the molten salt steam generator (B4), between the electric heater (B1) and the low-temperature molten salt tank (B6), between the low-temperature molten salt tank (B6) and the low-temperature molten salt transmission pipe (A2), and between the low-temperature molten salt tank (B6) and the feed water preheater (B5).

5. The operating system of molten salt solar-thermal power generation operating in full-day operation according to claim 3, characterized in that the electric heater (B1) comprises a high-temperature molten salt outlet connection pipe (B11), an electric heater shell (B12), an electric heater molten salt pipe (B13), an electric heating wire (B14) and a low-temperature molten salt inlet connection pipe (B15);

the low-temperature molten salt inlet connecting pipe (B15) and the high-temperature molten salt outlet connecting pipe (B11) are respectively positioned at the input end and the output end of the electric heater molten salt pipe (B13); an electric heating wire (B14) connected with the wind power generation control assembly (C92) is surrounded outside the electric heater molten salt pipe (B13).

6. The operating system for molten salt solar-thermal power generation operating in all-day operation according to claim 3, wherein the high-temperature molten salt tank (B2) comprises a metal outer plate layer (B21), a heat-preservation plate layer (B22), a temperature sensor (B23), a control panel (B24), a floating ball type liquid level sensor (B25), a refractory brick (B26), a heat-insulation rock wool plate (B27), a cooling ventilation opening (B28), an inner tank heat-resistance partition plate (B29), a vacuum heat-insulation layer (B210), a ceramic fiber heat-insulation layer (B45) (B211) and a concrete base (B212);

the high-temperature molten salt tank (B2) is divided into an upper part, a middle part and a lower part; the upper part is a vacuum cavity between the metal outer plate layer (B21) and the heat-insulating plate layer (B22); the middle part is a multi-layer surrounding cavity body, and the heat-resistant molten salt cavity (B213), the inner tank heat-resistant partition plate (B29), the vacuum heat-insulating layer (B210), the ceramic fiber heat-insulating layer (B45) (B211) and the metal outer plate layer (B21) are respectively arranged from inside to outside; the lower part is closely attached with a refractory brick (B26) and a heat insulation rock wool plate (B27); the bottom is a concrete base (B212) with a cooling vent (B28);

a temperature sensor (B23) and a floating ball type liquid level sensor (B25) are arranged in a hot-melt-resistant salt cavity (B213) at the inner side of the inner tank heat-resistant clapboard (B29), and a control panel (B24) is externally connected for monitoring and controlling the two sensors;

the internal structures of the low-temperature molten salt tank (B6) and the high-temperature molten salt tank (B2) are completely the same.

7. The operating system of molten salt photo-thermal power generation operating all day long according to claim 3, wherein the molten salt steam generator (B4) comprises a high-temperature molten salt inlet (B41), a medium-temperature molten salt outlet (B42), a high-temperature steam outlet (B43), a steam generator shell (B44), an insulating layer (B45), a mesh plate (B46), a high-temperature molten salt box (B47), a steam generator molten salt pipe (B48), a heat dissipation fin (B49), a medium-temperature molten salt box (B410) and a water inlet (B411);

the heat-insulating layer (B45) is arranged in the steam generator shell (B44); a screen plate (B46) is arranged at the upper part of the inner cavity of the steam generator shell (B44);

one side of the high-temperature molten salt inlet (B41) is connected with a heat-resistant molten salt cavity (B213) of the high-temperature molten salt tank (B2) through a molten salt pump (B3), and the other side is sequentially connected with a high-temperature molten salt tank (B47), a steam generator molten salt pipe (B48), a medium-temperature molten salt tank (B410) and a medium-temperature molten salt outlet (B42);

a plurality of groups of radiating fins (B49) are uniformly distributed on the steam generator molten salt pipe (B48);

the medium-temperature molten salt outlet (B42) and the water inlet (B411) are respectively connected to a medium-temperature molten salt inlet (B51) and a high-temperature water outlet (B53) of the feed water preheater (B5) through a steam generator molten salt pipe (B48) and a water pump (C1).

8. The operating system of molten salt photo-thermal power generation operating all day long as claimed in claim 3, wherein the feedwater preheater (B5) comprises a medium temperature molten salt inlet (B51), a low temperature molten salt outlet (B52), a high temperature water outlet (B53), a preheater housing (B54), a preheater molten salt pipe (B55) and a low temperature water inlet (B56);

the preheater molten salt tube (B55) is disposed within the preheater housing (B54);

one end of the preheater molten salt pipe (B55) is connected with the medium-temperature molten salt outlet (B42), and the other end of the preheater molten salt pipe (B55) is connected with the low-temperature molten salt tank (B6) through a molten salt pump (B3) and a valve III (B9);

the high-temperature water outlet (B53) and the low-temperature water inlet (B56) are respectively connected to the molten salt steam generator (B4) and a condensation water tank (C2) of the multi-energy coupling power generation system (C).

9. The operating system of molten salt solar-thermal power generation operating all day long according to claim 1, characterized in that the multi-energy coupling power generation system (C) comprises a water pump (C1), a condensate tank (C2), a steam turbine (C3), a generator (C4), a substation (C5), a power grid (C6), a cooling tower (C7) and a water pipe (C8);

the steam turbine (C3), the generator (C4), the transformer substation (C5), the power grid (C6), the cooling tower (C7) and the condensation water tank (C2) are sequentially connected in series; the input end of the steam turbine (C3) is connected to a molten salt steam generator (B4) of the sustainable molten salt heat exchange and storage system (B) through a water pump (C1); the output end of the condensation water tank (C2) is connected to a feed water preheater (B5) of the sustainable molten salt heat exchange and storage system (B) through a water pump (C1).

10. A method of operating a molten salt solar thermal power generation operating system operating throughout the day as claimed in any one of claims 1 to 9, comprising:

when the whole system operates, a trough type heat collecting mirror field (A1) is used for condensing light to a molten salt pipeline, low-temperature molten salt in the pipeline is heated, and a molten salt pump (B3) is used for conveying the heated high-temperature molten salt to a heat-resistant molten salt cavity (B213) of a high-temperature molten salt tank (B2) through a high-temperature molten salt transmission pipe (A3).