CN215655068U

CN215655068U - Salt melting system of molten salt thermal energy storage power station

Info

Publication number: CN215655068U
Application number: CN202121401200.XU
Authority: CN
Inventors: 栾海峰
Original assignee: Beijing Lanhai Yineng New Energy Group Co ltd
Current assignee: Beijing Lanhai Yineng New Energy Group Co ltd
Priority date: 2021-06-23
Filing date: 2021-06-23
Publication date: 2022-01-28
Anticipated expiration: 2031-06-23

Abstract

A salt melting system of a molten salt thermal energy storage power station belongs to the technical field of photo-thermal salt melting production. The utility model aims to shorten the salt dissolving period and reduce the salt dissolving cost. The heat source system comprises a salt melting furnace, a heat exchanger and a molten salt storage tank, wherein the salt melting furnace is communicated with a low-temperature molten salt inlet of the heat exchanger through a molten salt pipeline, the salt melting furnace is communicated with the molten salt storage tank through a delivery pump, a high-temperature molten salt outlet of the heat exchanger is communicated with the salt melting furnace, the heat exchanger is connected with a heat source system, the heat source system is used for providing a heat exchange heat source for the heat exchanger, and the heat exchanger can be an oil salt heat exchanger or a heat collection system which can be replaced by an electric heater or can directly heat molten salt by photo-heat. The salt melting is realized in a photo-thermal mode, the salt melting speed is obviously improved, and the system is simple in structure, simple and convenient to operate, high in safety, energy-saving, environment-friendly, clean and efficient.

Description

Salt melting system of molten salt thermal energy storage power station

Technical Field

The utility model relates to a solar thermal power station molten salt melting system, and belongs to the technical field of salt melting systems.

Background

In recent years, solar photo-thermal power generation has been rapidly developed as a new solar power generation technology. The solar photo-thermal power station heat storage system generally adopts molten salt as a heat storage medium.

Before being put into a solar photo-thermal power station, the molten salt is mainly supplied in a solid form (because the molten salt is solid at normal temperature), and the molten salt is convenient to transport and store. When the fused salt needs to be put into a solar photo-thermal power station for heat storage, a large amount of solid fused salt needs to be converted into high-temperature liquid fused salt, the fused salt is subjected to initial melting, the initial melting of the fused salt is a key procedure before a fused salt heat storage system of the photo-thermal power station enters debugging operation, the fused salt is changed into liquid high-temperature fused salt from a solid state through the flow, the fused salt enters the system to start circulation, and the fused salt is kept in a liquid state in the service life of the whole power station.

Aiming at the large-scale salt demand of a photo-thermal power station, the existing salt melting system mainly comprises electric heating and natural gas heating according to different heat sources, the salt melting mode mainly comprises the steps that solid molten salt is conveyed to a salt melting tank through a belt conveying system, the initial solid molten salt is converted into liquid molten salt through an electric heating device of the salt melting tank, the liquid molten salt is conveyed to a special natural gas salt melting furnace system through a salt melting pump to be heated, the newly added solid molten salt is converted into the liquid molten salt through the heated high-temperature molten salt, the mixed molten salt enters the special natural gas salt melting furnace system again to be heated, meanwhile, the partially heated molten salt is conveyed to a cold salt storage tank, and the liquid level of the salt melting tank is ensured. A large amount of solid molten salt needs to be converted into liquid molten salt every day by the natural gasification salt furnace system, meanwhile, the heating capacity of the special natural gasification salt furnace system is limited, and the cost of consumed natural gas and the time cost are high in the melting salt project of a large-scale photothermal power station of tens of thousands of tons.

Based on the above situation, the research work of the salt dissolving technical scheme is developed, and the method has very important significance for shortening the salt dissolving period, reducing the salt dissolving cost, improving the salt dissolving speed and quality and ensuring that both the photo-thermal power generation and the salt dissolving are not wrong.

SUMMERY OF THE UTILITY MODEL

The utility model aims to shorten the salt dissolving period and reduce the salt dissolving cost. The following presents a simplified summary of the utility model in order to provide a basic understanding of some aspects of the utility model. It should be understood that this summary is not an exhaustive overview of the utility model. It is not intended to determine the key or critical elements of the present invention, nor is it intended to limit the scope of the present invention.

The technical scheme of the utility model is as follows:

the salt melting system of the molten salt thermal energy storage power station comprises a salt melting furnace, a heat exchanger and a molten salt storage tank, wherein the salt melting furnace is communicated with a molten salt inlet of the heat exchanger through a molten salt pipeline, the salt melting furnace is communicated with the molten salt storage tank through a delivery pump, a molten salt outlet of the heat exchanger is communicated with the salt melting furnace, the heat exchanger is connected with a heat source system, and the heat source system is used for providing a heat exchange heat source for the heat exchanger.

Further: the number of the heat exchangers is multiple, and the heat exchangers are installed in a parallel mode.

Further: the number of the heat exchangers is multiple, and the heat exchangers are installed in series.

Further: two adjacent oil salt heat exchangers are communicated through a secondary molten salt pipeline.

Further: and the secondary molten salt pipeline is provided with a valve and a temperature measuring instrument.

The utility model provides a salt melting system of fused salt heat energy storage power station, includes salt melting furnace, heat exchanger, fused salt storage tank and supplementary electric heater, and the heat exchanger has fused salt entry, fused salt export, heat source export and heat source entry, and the fused salt entry and the supplementary electric heater of heat exchanger are connected respectively to the salt melting furnace, the salt melting furnace passes through delivery pump and fused salt storage tank intercommunication, and the fused salt export of heat exchanger communicates with the salt melting furnace through first pipeline, the heat exchanger passes through heat source export and heat source entry and establishes being connected with heat source system, and heat source system is used for providing the heat transfer heat source for the heat exchanger, and supplementary electric heater communicates with the salt melting furnace through the second pipeline.

Further: and the first pipeline and the second pipeline are respectively provided with a valve and a temperature measuring instrument.

Further: the electric energy used in the auxiliary electric heater is derived from abandoned wind power, abandoned light power or off-peak power.

Further: the heat source system is a heat conduction oil solar heat collection field, and the heat conduction oil solar heat collection field is adopted to heat a heat exchange heat source in the heat exchanger.

Further: the heat source system is a natural gas heat conduction oil furnace, and a heating mode of the natural gas heat conduction oil furnace is adopted to heat a heat exchange heat source in the heat exchanger.

Further: the heat source system is heat storage and conduction oil in the solar power generation system.

Further: the heat exchanger is a shell-and-tube heat exchanger, a shell-and-tube heat exchanger or a plate heat exchanger.

Further: the molten salt solar heat collection field is communicated with the molten salt furnace through a first pipeline, and the auxiliary electric heater is communicated with the molten salt furnace through a second pipeline.

Further: and a circulating pump is arranged on a connecting pipeline between the salt melting furnace and the fused salt solar heat collection field as well as between the fused salt furnace and the auxiliary electric heater.

The utility model has the following beneficial effects:

1. the salt melting system solves the problem that the conventional photo-thermal power station solid-state molten salt is melted by a special natural gas salt melting furnace system, the conventional special natural gas salt melting furnace realizes the salt melting process and is limited by factors such as furnace heating capacity, natural gas consumption and the like, the salt melting efficiency is low, the whole salt melting period cannot be guaranteed, and the salt melting fuel cost is high.

2. The salt melting work is carried out by utilizing the photo-thermal power generation system, so that both power generation and salt melting are realized, and the salt melting capacity is far greater than that of a special natural gas salt melting furnace system;

3. the system uses light to heat and melt salt when the sun is available in the daytime, and uses electric heating to absorb abandoned electricity or off-peak electricity to melt salt when the sun is unavailable at night, thereby effectively shortening the salt melting period.

4. Compared with the conventional salt dissolving mode, the salt dissolving is realized in a photo-thermal mode, the salt dissolving speed is obviously improved, and the system is simple, is simple and convenient to operate, high in safety, energy-saving and environment-friendly.

5. By adopting the salt melting system, the salt melting speed exceeds 210 tons/hour, is five times faster than the traditional salt melting speed, can exceed 4000 tons every day, is more than four times of the world record of single-day salt melting in the prior art, only needs two and a half weeks if 7 ten thousand tons of salt are continuously melted, is two months faster than the traditional salt melting mode, saves ten thousand yuan of fossil fuel of salt, saves 20% of equipment investment compared with the traditional salt melting system, and can create 6000 ten thousand-degree power generation profit by realizing energy storage and power generation in two months in advance according to the calculation of 100MW10 hour energy storage photo-thermal power station.

Drawings

FIG. 1 is a schematic diagram of a neutralized salt system according to an embodiment;

FIG. 2 is a schematic diagram of a salt neutralization system according to a second embodiment;

FIG. 3 is a system schematic of a salt digestion system of a molten salt thermal energy storage power plant;

FIG. 4 is a schematic diagram of a salt digestion system according to a thirteenth embodiment;

FIG. 5 is a schematic diagram of a ninth salt neutralization system according to an embodiment;

FIG. 6 is a block diagram of a decatized salt system in accordance with an embodiment;

FIG. 7 is a schematic diagram showing the relationship between salt dissolving amount and salt dissolving period between the conventional salt dissolving mode and the salt dissolving mode of the present invention;

in the figure, 1-molten salt furnace, 2-heat exchanger, 3-molten salt storage tank, 4-molten salt pipeline, 5-delivery pump, 6-heat source system, 7-secondary molten salt pipeline, 8-valve, 9-temperature measuring instrument, 10-auxiliary electric heater, 11-first pipeline, 12-second pipeline, 13-molten salt solar heat collection field, 14-circulating pump, 21-molten salt inlet, 22-molten salt outlet, 23-heat source outlet and 24-heat source inlet.

Detailed Description

In order that the objects, aspects and advantages of the utility model will become more apparent, the utility model will be described by way of example only, and in connection with the accompanying drawings. It is to be understood that such description is merely illustrative and not intended to limit the scope of the present invention. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present invention.

The first embodiment is as follows:

referring to fig. 1, the heat exchanger comprises a salt melting furnace 1, a heat exchanger 2 and a molten salt storage tank 3, wherein the salt melting furnace 1 is communicated with a molten salt inlet of the heat exchanger 2 through a molten salt pipeline 4, the salt melting furnace 1 is communicated with the molten salt storage tank 3 through a delivery pump 5, a molten salt outlet of the heat exchanger 2 is communicated with the salt melting furnace 1, the heat exchanger 2 is connected with a heat source system 6, and the heat source system 6 is used for providing a heat exchange heat source for the heat exchanger 2.

In the salt melting furnace 1, solid salt and high-temperature molten salt are mixed in the salt melting furnace 1 to form intermediate-temperature liquid molten salt, one part of the intermediate-temperature liquid molten salt is sent into a molten salt storage tank 3 through a delivery pump 5 to be stored, the other part of the intermediate-temperature liquid molten salt is sent into a heat source system 6 through a circulating pump, the intermediate-temperature liquid molten salt is heated again by utilizing a heat source of salt equalization of the heat source system 6 and is sent into the salt melting furnace 1, and cyclic salt formation is realized;

the heat exchanger 2 is used for increasing the medium-temperature molten salt to the high-temperature liquid molten salt;

when the system operates, solid salt and the high-temperature molten salt with the temperature of 300-.

The second embodiment is as follows:

referring to fig. 2, the present embodiment provides a salt melting system of a molten salt thermal energy storage power station, which is different from the first embodiment in that the number of the heat exchangers 2 is multiple, and the plurality of heat exchangers 2 are installed in parallel. The heat exchangers 2 arranged in parallel can heat the intermediate-temperature liquid molten salt at the temperature of 280-.

The third concrete implementation mode:

referring to fig. 2, the present embodiment provides a salt melting system of a molten salt thermal energy storage power station, and is different from the first embodiment in that the number of the heat exchangers 2 is multiple, and the plurality of heat exchangers 2 are installed in series. The intermediate-temperature liquid molten salt with the temperature of 280-340 ℃ can flow through a passage to exchange heat for many times by adopting the heat exchangers 2, 280-440 ℃ so as to achieve the high-temperature molten salt with the temperature of 300-440 ℃, and the whole system only has one passage by adopting a series connection mode, thereby being convenient for controlling the whole system by a switch.

The fourth concrete implementation mode:

referring to fig. 2, in the second embodiment, two adjacent heat exchangers 2 are communicated with each other through a secondary molten salt pipeline 7. And a valve 8 for opening/closing the secondary molten salt pipeline 7 and a temperature measuring instrument 8 for measuring the temperature of the liquid molten salt flowing through the secondary molten salt pipeline 7 are installed on the secondary molten salt pipeline 7. According to the arrangement, the 280-DEG C340 medium temperature molten salt flowing out of the molten salt furnace 1 enters the heat exchanger 2, and the 280-DEG C340 medium temperature molten salt is increased to the 300-DEG C440 high temperature molten salt in the heat exchanger 2; if the medium temperature liquid molten salt in the heat exchanger 2 can not effectively exchange heat to the high temperature molten salt temperature value state, the secondary molten salt pipeline 7 is opened, the liquid molten salt is conveyed into the other heat exchanger 2 connected in parallel again, and heat exchange is further carried out on the liquid molten salt until the high temperature molten salt state of 300-440 ℃ is achieved.

The fifth concrete implementation mode:

referring to fig. 3, the present embodiment provides a salt melting system of a molten salt thermal energy storage power station, including a salt melting furnace 1, a heat exchanger 2, a molten salt storage tank 3, and an auxiliary electric heater 10, where the heat exchanger 2 has a molten salt inlet 21, a molten salt outlet 22, a heat source outlet 23, and a heat source inlet 24, the salt melting furnace 1 is connected to the molten salt inlet 21 of the heat exchanger 2 and the auxiliary electric heater 10, the salt melting furnace 1 is communicated with the molten salt storage tank 3 through a transfer pump 5, the molten salt outlet 22 of the heat exchanger 2 is communicated with the salt melting furnace 1 through a first pipeline 11, the heat exchanger 2 is connected to a heat source system 6 through the heat source outlet 23 and the heat source inlet 24 (the heat source outlet 23 and the heat source inlet 24 can be exchanged), the heat source system 6 is configured to provide a heat exchange source for the heat exchanger 2, and the auxiliary electric heater 10 is communicated with the salt melting furnace 1 through a second pipeline 12.

In the present embodiment, the salt melting furnace 1 is used for converting the pulverized solid molten salt into a liquid state melt, and the salt melting furnace 1 is a container for realizing salt melting;

a part of the medium-temperature molten salt in the salt melting furnace 1 flows into the heat exchanger 2 and/or the auxiliary electric heater 10, the medium-temperature molten salt is heated to high-temperature molten salt by the heat exchanger 2 and/or the auxiliary electric heater 10, and then the high-temperature molten salt is conveyed into the salt melting furnace 1 through the circulating pump, so that the circulating salt melting work is realized;

when the system works for melting salt, solid salt and the high-temperature molten salt with the temperature of 300-440 ℃ are mixed in the melting salt furnace 1 to form the medium-temperature liquid molten salt with the temperature of 280-340 ℃, one path of the formed medium-temperature liquid molten salt is sent to the molten salt storage tank 3 for storage through the delivery pump 5, the other portion of the formed medium-temperature liquid molten salt is sent into the heat exchanger 2 or the auxiliary electric heater 10 through the circulating pump, the medium-temperature liquid molten salt (with the temperature of 280-340 ℃) is heated and converted into the high-temperature liquid molten salt (with the temperature of 300-440 ℃) through the heat exchanger 2 or the auxiliary electric heater 10, and then the high-temperature molten salt is delivered into the melting salt furnace 1 to realize cyclic salt, wherein the delivery amount ensures that the solid molten salt newly added into the melting salt furnace 1 can reach a certain temperature and the solid molten salt is melted.

The number of the auxiliary electric heaters 10 is multiple, and the multiple auxiliary electric heaters 10 are arranged in the whole salt dissolving system in a parallel or series mode;

the salt melting system in the embodiment solves the problem that the conventional photo-thermal power station solid-state molten salt is melted through a special natural gas salt melting furnace system, the salt melting process of the conventional special natural gas salt melting furnace is limited by factors such as furnace heating capacity and natural gas consumption, the whole salt melting period is long, and the construction and operation costs of salt melting cost are high.

By adopting the salt melting system of the embodiment, the system utilizes the photo-thermal power generation system to carry out salt melting work, so that both power generation and salt melting are realized, and the salt melting capacity is far greater than that of a traditional special natural gas salt melting furnace system;

when the system has the sun in the daytime, the salt is dissolved by using light and heat, and when the sun does not exist at night, the salt is dissolved by using electric heating to absorb abandoned electricity or off-peak electricity, so that the salt dissolving period is effectively shortened.

The sixth specific implementation mode:

referring to fig. 3, in the fifth embodiment, a valve 8 and a temperature measuring instrument 9 are respectively installed on the first pipeline 11 and the second pipeline 12. The valve 8 is used for controlling the opening and closing of the pipeline, and the temperature measuring instrument 8 is used for measuring the temperature of fluid in the pipeline. The opening and closing of the molten salt in the first pipeline 11 and the second pipeline 12 are monitored in real time by utilizing the information interaction of the valve 8 and the temperature measuring instrument 9, so that the smooth proceeding of the molten salt work is ensured.

The seventh embodiment:

on the basis of the fifth embodiment, the electric energy used in the auxiliary electric heater 10 is derived from low-cost electricity such as abandoned wind electricity, abandoned light electricity, wave valley electricity and the like, and the cost of the electric energy is lower than that of the electric energy provided by a conventional power station.

The specific implementation mode is eight:

referring to fig. 4 and 6, based on the fifth embodiment, the heat exchanger 2 is used for heating and converting the intermediate-temperature liquid molten salt (280-.

In the present embodiment, the temperature of the high-temperature molten salt can be varied up and down to 370 degrees, the range of 70 degrees (not more than 600 degrees at the maximum), the temperature of the medium-temperature salt can be varied up and down to 310 degrees, and the range of 30 degrees.

The specific implementation method nine:

referring to fig. 4 and 5, on the basis of the fifth specific embodiment, the heat source system 6 is a heat-conducting oil solar heat collection field, and the heat exchange heat source in the heat exchanger 2 is heated by using the heat-conducting oil solar heat collection field, in this embodiment, the heat exchange heat source is heat-conducting oil, that is, the heat-conducting oil in the heat exchanger 2 is heated by using the heat-conducting oil solar heat collection field, and then the heat of the heat-conducting oil is converted into liquid molten salt by using the heat exchanger 2 to form high-temperature liquid molten salt, which is used for being conveyed into the salt melting furnace 1 to realize cyclic salt formation.

In the present embodiment, the heat exchanger 2 is a heat transfer oil heat exchanger, and inside the heat exchanger 2, heat is transferred to the intermediate temperature molten salt entering the heat exchanger 2 using high temperature heat transfer oil, so that the temperature of the intermediate temperature molten salt reaches the high temperature molten salt. The heat conduction oil is derived from a heat conduction oil solar heat collection field, and the heat conduction oil in the heat exchanger 2 is heated by adopting a solar mirror field mode. The heat conducting oil in the heat exchanger 2 is derived from a solar mirror field, the groove type solar heat collector is specifically used, the heat conducting oil in the heating pipeline is converted into heat energy by utilizing solar energy, salt melting work is carried out by utilizing the converted heat energy, the usage amount of natural gas of a molten salt project of a large photo-thermal power station is reduced, and the salt melting cost is reduced. Meanwhile, solar energy is fully utilized, and environmental benefits are improved.

In the embodiment, by adopting the salt melting system of the embodiment, the salt melting speed exceeds 210 tons/hour, is five times faster than the traditional salt melting speed, can exceed 4000 tons every day, and is more than four times of the previous single-day salt melting world record, if 7 ten thousand tons of salt are continuously melted, only two weeks and half are needed, the salt melting speed is two months faster than the traditional salt melting mode, ten thousand thousands of dollars of fossil fuel for saving salt are saved, the equipment investment is also saved by 20% compared with the traditional salt melting system, and the energy storage and power generation can be realized in two months in advance according to the calculation of a 100MW 10-hour energy storage photo-thermal power station, so that 6000-generation income can be created. The specific comparison is shown in the figure:

TABLE 1 comparison of photothermolysis of salt System with classical salt System

It should be noted that, in a solar power generation project, a special natural gasified salt furnace is adopted in a conventional salt system in the world at present, and flue gas generated after combustion of natural gas is used for providing heat to melt solid molten salt into liquid.

When salt melting is needed in a certain solar power generation project, a special natural gasified salt furnace is purchased in a conventional mode, and then heat is provided by using flue gas generated after natural gas combustion, so that solid molten salt is melted into liquid;

different from the conventional salt dissolving mode, in the present embodiment, the salt dissolving operation is performed by using the original equipment of the solar power plant, for example, the heat exchanger 2 and the heat conduction oil solar heat collection field (heat source system 6) used in the present embodiment are the existing equipment of the power plant, and the original function of the equipment is used for solar power generation, in the present embodiment, the salt dissolving system is formed according to the matching, connection and mode of the technical features in the present embodiment, and is used for salt dissolving, so that the cost of purchasing and building a natural gasified salt furnace is saved, the carbon dioxide emission in the salt dissolving process is reduced, and the salt dissolving speed is increased and the salt dissolving period is shortened by using the existing equipment to realize salt dissolving (as shown in fig. 7);

it should be noted that: the heat storage medium used in the photo-thermal power station project is high-temperature molten salt, taking a photo-thermal power generation project with 100MW level and 10 hours of energy storage as an example, the power station is provided with a high-temperature molten salt heat storage system, and the high-temperature molten salt used in the system is a mixture of 40% of potassium nitrate and 60% of sodium nitrate in percentage by mass. Before the molten salt energy storage system is put into operation, solid molten salt is melted and injected into the cold salt tank, and the step (salt melting) plays a crucial role in smooth debugging and formal operation of the heat storage system. At present, the international conventional salt system adopts a special natural gasified salt furnace, and uses the flue gas generated after the combustion of natural gas to provide heat so as to melt the solid molten salt into liquid. The conventional salt dissolving system not only has low salt dissolving rate and can not normally put the heat storage system into operation in a short time, but also needs to consume a large amount of fossil fuel. But is limited by the characteristics of high melting temperature of molten salt, more technical difficulties of salt melting systems and the like, and the practical exploration of high-speed and low-carbon novel salt melting technology at home and abroad is almost zero.

The detailed implementation mode is ten:

referring to fig. 4 and 6, on the basis of the fifth specific embodiment, the heat source system 6 is a natural gas heat-conducting oil furnace, and a heating manner of the natural gas heat-conducting oil furnace is adopted to heat a heat exchange heat source in the heat exchanger 2. In this embodiment, the heat exchange heat source is heat transfer oil, and the heat transfer oil in the heat exchanger 2 is heated by adopting a heating mode of a natural gas heat transfer oil furnace. The heat conduction oil is heated by adopting a natural gas heating mode, and enters the heat exchanger 2 (a heat conduction oil heat exchanger and an oil salt heat exchanger) to exchange heat with the molten salt, so that the molten salt flowing out of the heat exchanger 2 reaches a high-temperature state.

The concrete implementation mode eleven:

referring to fig. 4, on the basis of the fifth embodiment, the heat conduction oil used for melting the molten salt in the heat exchanger 2 is the heat storage heat conduction oil in the solar power generation system, and the heat storage heat conduction oil cannot be used for power generation, but the heat of the heat storage heat conduction oil can still be used for melting the salt.

The specific implementation mode twelve:

with reference to the fifth embodiment, the heat exchanger 2 is a shell-and-tube heat exchanger, or a plate heat exchanger.

The specific implementation mode is thirteen:

referring to fig. 4, the present embodiment provides a salt melting system of a molten salt thermal energy storage power station, including a salt melting furnace 1, a molten salt solar heat collection field 13, a molten salt storage tank 3, and an auxiliary electric heater 10, wherein the salt melting furnace 1 is connected to the molten salt solar heat collection field 13 and the auxiliary electric heater 10, respectively, the molten salt solar heat collection field 13 is communicated with the salt melting furnace 1 through a first pipeline 11, and the auxiliary electric heater 10 is communicated with the salt melting furnace 1 through a second pipeline 12.

In the embodiment, after solid salt and 440-degree high-temperature molten salt at 300-.

Different from the fifth embodiment, in the fifth embodiment, the heat exchanger 2 is replaced by the molten salt solar heat collecting field 13, the intermediate temperature molten salt enters the molten salt solar heat collecting field 13, the temperature of the intermediate temperature molten salt is raised to the high temperature molten salt under the action of the molten salt solar heat collecting field 13, the salt melting work is realized by using the temperature of the high temperature molten salt, both power generation and salt melting are realized, and the salt melting capacity is far greater than that of a salt melting furnace system;

in the present embodiment, the molten salt solar heat collection field 13 includes a molten salt trough type, a tower type collector, and the like.

The salt melting system in the embodiment solves the problem that the conventional photo-thermal power station solid-state molten salt is melted through a special natural gas salt melting furnace system, the conventional special natural gas salt melting furnace realizes the salt melting process and is limited by factors such as furnace heating capacity and natural gas consumption, the whole salt melting period cannot be guaranteed, and the salt melting cost is high.

The specific implementation mode is fourteen:

in the present embodiment, in conjunction with the thirteenth embodiment, a circulation pump 14 is installed in a connection pipe between the molten salt furnace 1 and the molten salt solar heat collecting field 13 and the auxiliary electric heater 10.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.

The relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.

In the description of the present invention, it is to be understood that the orientation or positional relationship indicated by the orientation words such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal" and "top, bottom", etc. are usually based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplicity of description, and in the case of not making a reverse description, these orientation words do not indicate and imply that the device or element being referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore, should not be considered as limiting the scope of the present invention; the terms "inner and outer" refer to the inner and outer relative to the profile of the respective component itself.

Spatially relative terms, such as "above … …," "above … …," "above … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial relationship to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary term "above … …" can include both an orientation of "above … …" and "below … …". The device may be otherwise variously oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

It should be noted that the terms "first," "second," and the like in the description and claims of this application and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are capable of operation in sequences other than those illustrated or described herein.

It should be noted that, in the above embodiments, as long as the technical solutions can be aligned and combined without contradiction, those skilled in the art can exhaust all possibilities according to the mathematical knowledge of the alignment and combination, and therefore, the present invention does not describe the technical solutions after alignment and combination one by one, but it should be understood that the technical solutions after alignment and combination have been disclosed by the present invention.

This embodiment is only illustrative of the patent and does not limit the scope of protection thereof, and those skilled in the art can make modifications to its part without departing from the spirit of the patent.

Claims

1. A salt melting system of a molten salt thermal energy storage power station is characterized in that: including melting salt furnace (1), heat exchanger (2) and fused salt storage tank (3), melting salt furnace (1) is through fused salt pipeline (4) intercommunication heat exchanger's (2) fused salt entry, and melting salt furnace (1) is through delivery pump (5) and fused salt storage tank (3) intercommunication, and the fused salt export of heat exchanger (2) and melting salt furnace (1) intercommunication, heat exchanger (2) and heat source system (6) set up the relation of connection, and heat source system (6) are used for providing the heat transfer heat source for heat exchanger (2).

2. The salt melting system of a molten salt thermal energy storage power plant of claim 1, characterized in that: the number of the heat exchangers (2) is multiple, and the heat exchangers (2) are installed in a parallel mode.

3. The salt melting system of a molten salt thermal energy storage power plant of claim 1, characterized in that: the number of the heat exchangers (2) is multiple, and the heat exchangers (2) are installed in series.

4. The salt melting system of a molten salt thermal energy storage power plant of claim 2, characterized in that: two adjacent heat exchangers (2) are communicated through a secondary molten salt pipeline (7).

5. The salt melting system of a molten salt thermal energy storage power plant of claim 4, characterized in that: and a valve (8) and a temperature measuring instrument (9) are arranged on the secondary molten salt pipeline (7).

6. A salt melting system of a molten salt thermal energy storage power station is characterized in that: comprises a salt melting furnace (1), a heat exchanger (2), a molten salt storage tank (3) and an auxiliary electric heater (10), wherein the heat exchanger (2) is provided with a molten salt inlet (21), a molten salt outlet (22), a heat source outlet (23) and a heat source inlet (24), the salt melting furnace (1) is respectively connected with the molten salt inlet (21) of the heat exchanger (2) and the auxiliary electric heater (10), the salt melting furnace (1) is communicated with the molten salt storage tank (3) through a delivery pump (5), a molten salt outlet (22) of the heat exchanger (2) is communicated with the salt melting furnace (1) through a first pipeline (11), the heat exchanger (2) is connected with a heat source system (6) through a heat source outlet (23) and a heat source inlet (24), the heat source system (6) is used for providing a heat exchange heat source for the heat exchanger (2), and the auxiliary electric heater (10) is communicated with the salt melting furnace (1) through a second pipeline (12).

7. The salt melting system of a molten salt thermal energy storage power plant of claim 6, characterized in that: and the first pipeline (11) and the second pipeline (12) are respectively provided with a valve (8) and a temperature measuring instrument (9).

8. The salt melting system of a molten salt thermal energy storage power plant of claim 6, characterized in that: the electric energy used in the auxiliary electric heater (10) is derived from abandoned wind power, abandoned light power or wave valley power.

9. The salt melting system of a molten salt thermal energy storage power plant of claim 1 or 6, characterized in that: the heat source system (6) is a heat conduction oil solar heat collection field, and a heat exchange heat source in the heat exchanger (2) is heated by adopting the heat conduction oil solar heat collection field.

10. The salt melting system of a molten salt thermal energy storage power plant of claim 1 or 6, characterized in that: the heat source system (6) is a natural gas heat-conducting oil furnace, and a heating mode of the natural gas heat-conducting oil furnace is adopted to heat a heat exchange heat source in the heat exchanger (2).

11. The salt melting system of a molten salt thermal energy storage power plant of claim 1 or 6, characterized in that: the heat source system (6) is heat storage and conduction oil in a solar power generation system.

12. The salt melting system of a molten salt thermal energy storage power plant of claim 1 or 6, characterized in that: the heat exchanger (2) is a shell-and-tube heat exchanger, a shell-and-tube heat exchanger or a plate heat exchanger.

13. A salt melting system of a molten salt thermal energy storage power station is characterized in that: the solar energy heat collection system comprises a salt melting furnace (1), a fused salt solar heat collection field (13), a fused salt storage tank (3) and an auxiliary electric heater (10), wherein the salt melting furnace (1) is respectively connected with the fused salt solar heat collection field (13) and the auxiliary electric heater (10), the fused salt solar heat collection field (13) is communicated with the salt melting furnace (1) through a first pipeline (11), and the auxiliary electric heater (10) is communicated with the salt melting furnace (1) through a second pipeline (12).

14. The salt melting system of a molten salt thermal energy storage power plant of claim 13, wherein: and a circulating pump (14) is arranged on a connecting pipeline between the salt melting furnace (1) and the molten salt solar heat collection field (13) and between the molten salt solar heat collection field and the auxiliary electric heater (10).