CN217450086U

CN217450086U - Solar thermal power station salt melting system based on fused salt solar heat collection field

Info

Publication number: CN217450086U
Application number: CN202121401140.1U
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: 2022-09-20
Anticipated expiration: 2031-06-23

Abstract

A solar thermal power station salt melting system based on a fused salt solar heat collection field belongs to the technical field of photo-thermal salt melting production. The utility model discloses a shorten salt dissolving cycle, reduce salt dissolving cost. The utility model discloses a change salt stove, fused salt solar energy collection field and fused salt storage tank, change the entry that the salt stove passes through fused salt pipeline intercommunication fused salt solar energy collection field, change the salt stove and pass through delivery pump and fused salt storage tank intercommunication, the export in fused salt solar energy collection field is through first pipeline and change the salt stove intercommunication. The utility model discloses a light and heat mode realizes changing salt, and its salt speed is showing and is improving to this system simple structure, the system operation is simple and convenient, and the security is high, energy-concerving and environment-protective, clean high-efficient.

Description

Solar thermal power station salt melting system based on fused salt solar heat collection field

Technical Field

The utility model relates to a solar energy light and heat power station fused salt system belongs to and changes salt system technical field.

Background

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 conveniently transported and stored by adopting the solid form. 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.

In the existing photothermal solar thermal power station, two schemes for realizing salt melting are available, one scheme is that after an electric heater is adopted for salt initialization, a molten salt circulating pump is used for pumping low-temperature liquid molten salt into a natural gasified salt furnace, and high-temperature flue gas generated by burning natural gas is used for heating the molten salt in a coil pipe in the molten salt furnace to a high-temperature state and then conveying the molten salt back to a molten salt tank. Adding sodium nitrate and potassium nitrate (solid molten salt) into the molten salt tank in proportion, and when the temperature of the molten salt in the molten salt tank meets the requirement, conveying the molten salt to a molten salt tank through another molten salt conveying pump; and secondly, sodium nitrate and potassium nitrate are crushed and mixed in proportion and then directly enter a natural gasified salt furnace, a heat exchange coil is arranged in a hearth, high-temperature flue gas is contained in the heat exchange coil, the flowing direction of the high-temperature flue gas is opposite to the stirring direction of liquid in the furnace, and melted liquid molten salt overflows into a buffer tank through an overflow pipe and then is pumped into a molten salt tank from the buffer tank. The two traditional salt melting modes both use flue gas obtained after natural gas combustion as a heat source for heating solid molten salt particles, and a large amount of natural gas is consumed in the salt melting process. The salt melting speed is about 30-40t/h due to the technical limit of the natural gas furnace and the safety consideration. After salt dissolving is finished, the matched salt dissolving equipment has no utilization value in the project, and can only be used for the next project to carry out secondary salt dissolving or waste after shelving.

In addition to the above statements, the conventional salt formation process has the following disadvantages:

1. the built salt melting furnace system for melting salt by using a natural gas heating mode has higher cost, and after primary salt melting is realized, the molten salt is put into a solar photo-thermal system for use, and secondary salt melting is not needed, so that matched natural gas salt melting furnace system equipment cannot be reasonably used;

2. when the natural gasified salt furnace system is used for realizing salt melting, natural gas needs to be combusted, and the cost of the consumed natural gas is high in a tens of thousands of tons of large-scale photo-thermal power station molten salt projects;

3. the natural gasified salt furnace system is used for burning natural gas, so that the discharged carbon dioxide is large, and the environment is polluted to a certain extent;

4. the temperature raising capability of a natural gasification salt furnace system is limited, and the salt melting speed is low and the salt melting period is long in a tens of thousands-ton large-scale photo-thermal power station molten salt project.

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 discloses a shorten salt dissolving cycle, reduce salt dissolving cost. A brief summary of the present invention is provided below in order to provide a basic understanding of some aspects of the present invention. It should be understood that this summary is not an exhaustive overview of the invention. It is not intended to identify key or critical elements of the invention or to delineate the scope of the invention.

The technical scheme of the utility model:

the utility model provides a solar energy light and heat power station salt melting system based on fused salt solar energy collection field, includes salt melting furnace, fused salt solar energy collection field and fused salt storage tank, the salt melting furnace passes through the entry of fused salt pipeline intercommunication fused salt solar energy collection field, and the salt melting furnace passes through delivery pump and fused salt storage tank intercommunication, and the export of fused salt solar energy collection field is through first pipeline and salt melting furnace intercommunication.

Preferably: the auxiliary electric heater is communicated with the molten salt pipeline, and is communicated with the salt melting furnace through a second pipeline.

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

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

Preferably: 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 discloses following beneficial effect has:

1. the utility model discloses a salt melting system has solved conventional light and heat power station solid-state fused salt and has all gone on the salt melting through dedicated natural gasification salt stove system, and conventional dedicated natural gasification salt stove realizes the salt melting process, receives factors such as stove heating power, natural gas quantity to restrict, and salt melting efficiency is not high, and whole salt melting cycle can not be ensured, and salt melting fuel is with high costs.

2. The utility model utilizes the photo-thermal power generation system to carry out salt dissolving work, thus the power generation and the salt dissolving are both not wrong, and the salt dissolving capacity is far larger than that of a special natural gas salt dissolving furnace system;

3. the utility model discloses when having the sun daytime, with light and heat salt, when not having the sun night, utilize the electrical heating absorption to abandon electricity or low ebb electricity and carry out salt, effectively shortened the cycle of salt.

4. The utility model discloses compare with conventional salt melting mode, realize salt melting through the light and heat mode, its salt melting speed is showing and is improving to this system is simple, and the system operation is simple and convenient, and the security is high, and is energy-concerving and environment-protective.

5. The utility model discloses compare with conventional salt melting mode, conventional salt melting mode receives equipment environment, equipment self, factory building environmental impact, and the cleanliness of salt is low, and carries out salt melting through the light and heat transfer mode, and is clean high-efficient.

6. Adopt the utility model discloses a salt melting scheme carries in proportion to the salt melting furnace after sodium nitrate and potassium nitrate are broken, adopt electric heater to carry out the initialization salt after, utilize the low temperature liquid fused salt pump in the salt melting furnace to go into fused salt solar energy collection field, through the high temperature of fused salt solar energy collection field absorption solar energy, heat fused salt to the high temperature state, then transport and return the salt melting furnace, form the liquid fused salt of low temperature more than 270 ℃ after high temperature liquid salt mixes with normal atmospheric temperature solid fused salt to carry and store to the fused salt storage tank in.

The salt melting speed of the photothermal salt melting system exceeds 210t/h, which is 5-7 times of the traditional salt melting speed, and the photothermal salt melting system takes solar energy as a source of heat required by salt melting, does not need any fossil fuel, and is clean and environment-friendly. Because the original heat exchange equipment of the light and heat power station is utilized, the construction cost is saved. After salt melting is finished, the matched feeding system can be detached and recycled, and the salt melting furnace and the electric heater can be directly converted into a high-temperature energy storage system for absorbing waste wind and light and realizing energy storage.

7. Adopt the utility model discloses a salt melting system, its salt melting speed exceeds 210 tons/hour, and is fast five times than traditional salt melting speed, can exceed 4000 tons every day, is more than four times of the single salt melting world record of day before, if melt 7 ten thousand tons of salt in succession and only need two weeks half, two months fast than traditional salt melting mode, realize the energy storage system electricity generation in advance, save the fossil fuel ten thousand yuan of salt, equipment investment also saves 20% than traditional salt melting system.

Drawings

FIG. 1 is a diagram of a solar photothermal power station salt melting system based on a molten salt solar heat collection field;

FIG. 2 is a diagram of a salt digestion system according to the second embodiment;

FIG. 3 is a schematic diagram showing the relationship between the salt dissolving amount and the salt dissolving period in the conventional salt dissolving mode and the salt dissolving mode of the present invention;

in the figure, 1-a salt melting furnace, 2-a molten salt solar heat collection field, 3-a molten salt storage tank, 4-a molten salt pipeline, 5-a delivery pump, 8-a valve, 9-a temperature measuring instrument, 10-an auxiliary electric heater, 11-a first pipeline, 12-a second pipeline and 14-a circulating pump.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described below with reference to specific embodiments shown in the accompanying drawings. It should be understood that the description is intended to be illustrative only and is 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 solar thermal power station salt melting system based on the molten salt solar heat collection field comprises a salt melting furnace 1, a molten salt solar heat collection field 2 and a molten salt storage tank 3, wherein the salt melting furnace 1 is communicated with an inlet of the molten salt solar heat collection field 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, and an outlet of the molten salt solar heat collection field 2 is communicated with the salt melting furnace 1 through a first pipeline 11.

In the embodiment, after solid salt and high-temperature molten salt with the temperature of 300-.

In the embodiment, the molten salt solar heat collecting field 2 is adopted to raise the temperature of the medium-temperature molten salt to the high-temperature molten salt, the temperature of the high-temperature molten salt is utilized to realize salt melting work, 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 collecting field 2 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.

In this embodiment, the salt melting system of this embodiment is adopted, the salt melting speed exceeds 210 tons/hour, which is five times faster than the conventional salt melting speed, and can exceed 4000 tons per day, which is four times or more of the previous single-day salt melting world record, if 7 ten thousand tons of salt are melted continuously, only two weeks and half are needed, which is two months faster than the conventional salt melting method, the heat storage island power generation can be realized in advance, the fossil fuel of the salt is saved, the equipment investment is also saved by 20% compared with the conventional salt melting system, and the specific comparison is shown as follows:

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

It should be noted that, in a solar power generation project, a 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 natural gasified salt furnace is purchased in a conventional mode, and then heat is provided by using flue gas generated after combustion of natural gas, 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 molten salt solar heat collecting field 2 used in the present embodiment is 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 molten salt solar heat collecting field is used for forming a salt dissolving system according to the matching and connecting mode of the technical features in the present embodiment, and the salt dissolving system 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 and the salt dissolving period are improved by using the existing equipment to realize salt dissolving (as shown in fig. 3);

it should be noted that: the heat storage medium used in the photo-thermal power station project is high-temperature molten salt, taking a 100 MW-level groove type heat conduction oil photo-thermal power generation project in Wulat as an example, the power station is provided with a high-temperature molten salt heat storage system, and the high-temperature molten salt used by the system is a mixture of potassium nitrate with the mass fraction of 40% and sodium nitrate with the mass fraction of 60%. Solid molten salt is melted and injected into a cold salt tank before the molten salt energy storage system is put into operation, and the step (salt melting) plays a vital role in smooth debugging and formal operation of the heat storage system. At present, the internationally conventional salt melting system adopts a natural gasification salt furnace, and uses the flue gas generated after the combustion of natural gas to provide heat so as to melt solid molten salt into liquid. The conventional salt system not only has low salt dissolving rate and cannot normally put the heat storage system into operation in a short time, but also needs to consume a large amount of fossil fuel, thereby being contrary to the promise of 'double carbon'. 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 salt melting system of the embodiment can ensure that both photo-thermal power generation and salt melting are not wrong, and has very important significance for realizing salt melting in photo-thermal power generation projects.

The second embodiment is as follows:

with reference to fig. 2, a solar photothermal power station salt melting system based on molten salt solar heat collection field includes a salt melting furnace 1, a molten salt solar heat collection field 2 and a molten salt storage tank 3, the salt melting furnace 1 is communicated with an inlet of the molten salt solar heat collection field 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, an outlet of the molten salt solar heat collection field 2 is communicated with the salt melting furnace 1 through a first pipeline 11, the solar photothermal power station salt melting system further includes an auxiliary electric heater 10, an inlet of the auxiliary electric heater 10 is communicated with the molten salt pipeline 4, 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-.

The third concrete implementation mode:

referring to fig. 1 and 2, on the basis of the first embodiment and the second 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 pipelines, and the temperature measuring instrument 8 is used for measuring the temperature of fluid in the pipelines. 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 fourth concrete implementation mode:

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

The fifth concrete implementation mode:

with reference to fig. 1 and 2 and the first embodiment, a circulation pump 14 is installed on a connection pipeline between the molten salt solar heat collecting field 2 and the auxiliary electric heater 10 in the salt melting furnace 1. The circulating pump 14 is used for pumping the low-temperature liquid molten salt in the molten salt furnace into the molten salt solar heat collection field.

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.

Unless specifically stated 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. 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 one 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 should be understood that the orientation or positional relationship indicated by the orientation words such as "front, back, up, down, left, right", "horizontal, 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 simplification of description, and in the case of not making a contrary explanation, these orientation words do not indicate and imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore, should not be interpreted 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 … …, on a surface", "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, the skilled person 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.

The present embodiments are merely exemplary and do not limit the scope of the patent, and those skilled in the art can make modifications to the parts thereof without departing from the spirit and scope of the patent.

Claims

1. The utility model provides a solar energy light and heat power station salt melting system based on fused salt solar energy collection field which characterized in that: including salt melting furnace (1), fused salt solar energy collection field (2) and fused salt storage tank (3), salt melting furnace (1) is through fused salt pipeline (4) intercommunication fused salt solar energy collection field's (2) entry, and salt melting furnace (1) is through delivery pump (5) and fused salt storage tank (3) intercommunication, and the export of fused salt solar energy collection field (2) is through first pipeline (11) and salt melting furnace (1) intercommunication.

2. The solar photothermal power station salt melting system based on the molten salt solar heat collection field according to claim 1 is characterized in that: the salt melting furnace further comprises an auxiliary electric heater (10), an inlet of the auxiliary electric heater (10) is communicated with the lava pipeline 4, and the auxiliary electric heater (10) is communicated with the salt melting furnace (1) through a second pipeline (12).

3. The solar photothermal power station salt dissolving system based on the molten salt solar heat collecting field according to claim 2 is 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).

4. The solar photothermal power station salt melting system based on the molten salt solar heat collection field according to claim 2 is characterized in that: the electric energy used in the auxiliary electric heater (10) is derived from abandoned wind power, abandoned light power or off-peak power.

5. The solar photothermal power station salt dissolving system based on the molten salt solar heat collecting field according to claim 2 is characterized in that: 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 (2) and between the molten salt solar heat collection field and the auxiliary electric heater (10).