阅读说明：本技术 相变储热介质熔化装置及熔化系统 (Phase-change heat storage medium melting device and melting system ) 是由 殷建平 刘荷芳 殷苏 刘平心 姜斌 于 2020-06-24 设计创作，主要内容包括：本发明涉及相变储热介质熔化装置及熔化系统,其中相变储热介质熔化装置包括保温容器；所述保温容器上设有至少一个用于固体的相变储热介质进入的入口,以及至少一个用于液态的相变储热介质流出的出口；所述保温容器内至少设有一组用于流通燃烧气体的加热管组；加热管组的排气口伸出保温容器；保温容器上设有搅拌器；搅拌器的驱动装置固定设置在保温容器的顶部,搅拌器的搅拌轴伸入保温容器内；所述加热管组设置在保温容器的中部至底部之间；所述保温容器上设有至少一个用于液态的相变储热介质流入的进口。而熔化系统主要是利用换热器和液态的相变储热介质对固态的相变储热介质进行熔化处理,大大降低生产成本。(The invention relates to a phase-change heat storage medium melting device and a melting system, wherein the phase-change heat storage medium melting device comprises a heat-insulating container; the heat-insulating container is provided with at least one inlet for solid phase-change heat storage medium to enter and at least one outlet for liquid phase-change heat storage medium to flow out; at least one group of heating pipe groups for circulating combustion gas is arranged in the heat-insulating container; the exhaust port of the heating pipe set extends out of the heat preservation container; a stirrer is arranged on the heat-insulating container; the driving device of the stirrer is fixedly arranged at the top of the heat-preservation container, and a stirring shaft of the stirrer extends into the heat-preservation container; the heating pipe group is arranged between the middle part and the bottom of the heat preservation container; the heat-insulating container is provided with at least one inlet for liquid phase-change heat storage medium to flow into. The melting system mainly utilizes the heat exchanger and the liquid phase-change heat storage medium to melt the solid phase-change heat storage medium, thereby greatly reducing the production cost.)

1. The phase-change heat storage medium melting device comprises a heat preservation container (1); the heat preservation container (1) is provided with at least one inlet (11) for solid phase-change heat storage medium to enter and at least one outlet for liquid phase-change heat storage medium to flow out; at least one group of heating pipe groups (2) for circulating combustion gas is arranged in the heat-insulating container (1); the exhaust port of the heating pipe set (2) extends out of the heat preservation container (1); the method is characterized in that: a stirrer (3) is arranged on the heat-insulating container (1); a driving device (31) of the stirrer (3) is fixedly arranged at the top of the heat-insulating container (1), and a stirring shaft (32) of the stirrer (3) extends into the heat-insulating container (1); the heating pipe set (2) is arranged between the middle part and the bottom of the heat-insulating container (1); the heat preservation container (1) is provided with at least one inlet for liquid phase-change heat storage medium to flow into.

2. The phase-change heat storage medium melting device according to claim 1, characterized in that: a jet pipe (4) for jetting liquid phase-change heat storage medium is distributed at the top inside the heat preservation container (1); the liquid inlet of the jet pipe (4) is communicated with the inlet (13); the jet pipe (4) is provided with a jet port (41).

3. The phase-change heat storage medium melting device according to claim 2, characterized in that: the jet pipe (4) is distributed along the inner wall of the heat preservation container (1) and is annular.

4. The phase-change heat storage medium melting device according to claim 1, 2, or 3, characterized in that: the bottom of the heat-insulating container (1) is also provided with an electric heating device (5) for heating the phase-change heat storage medium.

5. The phase-change heat storage medium melting device according to claim 1, characterized in that: the bottom of the heat-insulating container (1) is a settling zone, and a sewage outlet (15) for discharging the sediment in the settling zone is also arranged on the heat-insulating container (1).

6. The phase-change heat storage medium melting device according to claim 5, characterized in that: the sewage draining outlet (15) is arranged on the side wall of the heat-insulating container (1); the sewage outlet (15) is connected with one end of a sewage siphon (16), and the other end of the sewage siphon (16) is arranged in the sedimentation zone.

7. Phase change heat-retaining medium melting system, its characterized in that: the phase-change heat storage medium melting device of claim 1 or 2 or 3 or 5 or 6, the heat exchange device (6) for heating the liquid phase-change heat storage medium, the low-temperature molten salt tank (7) and the buffer tank (8); the heat-insulating container (1) of the phase-change heat storage medium melting device is provided with two inlets for liquid phase-change heat storage medium to flow in, namely a first inlet (12) and a second inlet (13), and an overflow port (14) for liquid phase-change heat storage medium to flow out;

the overflow port (14) is communicated with the inlet of the buffer tank (8), and the outlet of the buffer tank (8) is communicated with the liquid inlet of the heat exchange device (6); a liquid outlet of the heat exchange device (6) is respectively communicated with an inlet of the low-temperature molten salt tank (7) and a first inlet (12) through pipelines, and valves are arranged on the pipelines; the outlet of the low-temperature molten salt tank (7) is communicated with the second inlet (13) through a pipeline, and a high-pressure pump is arranged on the pipeline.

8. The phase change thermal storage medium melting system of claim 7, wherein: the bottom of the heat-insulating container (1) is also provided with an electric heating device (5) for heating the phase-change heat storage medium.

9. The phase change thermal storage medium melting system of claim 7, wherein: the heat-preserving container also comprises a conveying belt (9) used for conveying the solid phase-change heat storage medium to an inlet (11) of the heat-preserving container (1).

10. The phase change thermal storage medium melting system of claim 7, wherein: the heat exchange device (6) is a solar oil-smoke heat exchanger.

Technical Field

The invention relates to phase change heat storage equipment, in particular to a melting device and a melting system for a phase change heat storage medium.

Background

Energy storage in the solar photo-thermal power generation system is a key and indispensable important link, and most energy storage media are phase-change heat storage media, such as fused salt. The energy storage function is realized by heating and warming the heat storage medium.

The phase change heat storage medium melting furnace is the most common heat storage device in a solar photo-thermal power generation system, and the commonly adopted phase change medium is molten salt. The phase change medium melting furnace generally heats the phase change medium by using combustion gas flowing through a heating pipe. In order to ensure the salt dissolving effect, a large number of heating pipes are often arranged in the furnace body, and each heating pipe is provided with a heating nozzle. Therefore, the whole salt melting process needs to consume a large amount of fuel gas, the energy consumption is high, and the production cost is high. And the emission of fuel gas also has certain environmental protection problems.

Disclosure of Invention

The first purpose of the invention is to provide a phase-change heat storage medium melting device with low energy consumption.

The technical scheme for realizing the first purpose of the invention is as follows: the invention discloses a phase-change heat storage medium melting device, which comprises a heat-insulating container; the heat-insulating container is provided with at least one inlet for solid phase-change heat storage medium to enter and at least one outlet for liquid phase-change heat storage medium to flow out; at least one group of heating pipe groups for circulating combustion gas is arranged in the heat-insulating container; the exhaust port of the heating pipe set extends out of the heat preservation container; a stirrer is arranged on the heat-insulating container; the driving device of the stirrer is fixedly arranged at the top of the heat-preservation container, and a stirring shaft of the stirrer extends into the heat-preservation container; the heating pipe group is arranged between the middle part and the bottom of the heat preservation container; the heat-insulating container is provided with at least one inlet for liquid phase-change heat storage medium to flow into.

A jet pipe for jetting liquid phase-change heat storage medium is distributed at the top inside the heat preservation container; the liquid inlet of the jet pipe is communicated with the inlet; the jet pipe is provided with a jet port.

The jet pipes are distributed along the inner wall of the heat-insulating container and are annular.

The bottom of the heat-insulating container is also provided with an electric heating device for heating the phase-change heat storage medium. The electric heating device is a common component in a phase-change heat storage medium melting apparatus, and is not described in detail here.

The heating pipe set sequentially comprises a heating cavity, a heating pipe and a smoke exhaust pipe which are connected into a whole along the flowing direction of combustion gas; the heating cavity penetrates through the heat-insulating container, and the smoke exhaust pipe penetrates out of the heat-insulating container; and a heating nozzle is fixedly arranged on the heat-insulating container and is opposite to the heating cavity.

Wherein the phase-change heat storage medium is mainly inorganic salt, such as NaNO₃、KNO₃And mixtures thereof.

The bottom of the heat-insulating container is a settling zone, and a sewage outlet for discharging the sediment in the settling zone is also arranged on the heat-insulating container. The cleanness in the heat preservation container can be effectively ensured through the sewage draining outlet.

As an optimized design, the sewage draining outlet is arranged on the side wall of the heat-insulating container; the sewage outlet is connected with one end of a sewage siphon pipe, and the other end of the sewage siphon pipe is arranged in the sedimentation area.

The second purpose of the invention is to provide a phase change heat storage medium melting system, which utilizes solar energy and liquid phase change heat storage medium to perform low-energy consumption melting on the solid phase change heat storage medium.

The technical scheme for realizing the second purpose of the invention is as follows: the phase-change heat storage medium melting system comprises the phase-change heat storage medium melting device, a heat exchange device for heating the liquid phase-change heat storage medium, a low-temperature molten salt tank and a buffer tank; the heat-insulating container of the phase-change heat storage medium melting device is provided with two inlets for liquid phase-change heat storage medium to flow in, namely a first inlet, a second inlet and an overflow port for liquid phase-change heat storage medium to flow out;

the overflow port is communicated with the inlet of the buffer tank, and the outlet of the buffer tank is communicated with the liquid inlet of the heat exchange device; a liquid outlet of the heat exchange device is respectively communicated with an inlet and a first inlet of the low-temperature molten salt tank through pipelines, and valves are arranged on the pipelines; the outlet of the low-temperature molten salt tank is communicated with the second inlet through a pipeline, and a high-pressure pump is arranged on the pipeline. And the liquid phase-change heat storage medium in the buffer tank is reserved from an outlet of the buffer tank under the action of a pump carried by the buffer tank.

Meanwhile, the device also comprises a conveying belt used for conveying the solid phase-change heat storage medium to the inlet of the heat-preservation container.

The heat exchange device is a solar oil-smoke heat exchanger. Since the solar oil-smoke heat exchanger is the prior art, it is not specifically described herein.

The invention has the positive effects that: (1) according to the phase-change heat storage medium melting device, the solid phase-change heat storage medium is melted by the liquid phase-change heat storage medium, the stirrer and the heating pipe group positioned at the bottom of the heat preservation container, and the solid phase-change heat storage medium can be melted only by one or a few heating pipe groups, so that the production cost is greatly saved.

(2) Because the solid phase-change heat storage medium can float on the surface layer of the liquid phase-change heat storage medium after being added into the heat preservation container, the liquid phase-change heat storage medium can be fully contacted and mixed with the solid phase-change heat storage medium on the surface layer through the jet pipe, and the melting efficiency and the melting effect are improved.

(3) The jet pipe adopts an annular design, so that the jet range is further enlarged, and the mixing effect is improved.

(4) The electric heating device can further improve the melting efficiency and the melting effect, and plays a role in auxiliary melting.

(6) According to the phase change heat storage medium melting system, the liquid phase change heat storage medium is pre-stored through the low-temperature molten salt tank, and the operation of the whole system can be realized after a certain amount of liquid phase change heat storage medium is pre-stored.

(7) According to the phase-change heat storage medium melting system, the liquid phase-change heat storage medium participating in melting is heated through the heat exchanger (particularly the solar oil-smoke heat exchanger), so that the liquid phase-change heat storage medium can be recycled, and the melting requirement can be met.

Drawings

In order that the present disclosure may be more readily and clearly understood, reference is now made to the following detailed description of the present disclosure taken in conjunction with the accompanying drawings, in which

FIG. 1 is a schematic illustration of the construction of a molten salination salt plant according to the present invention;

FIG. 2 is a schematic diagram of the salt digestion system of the present invention;

FIG. 3 is a schematic structural view of a jet pipe according to the present invention;

FIG. 4 is a schematic structural view of a heating tube assembly according to the present invention;

fig. 5 is another schematic structural diagram of a heating tube set in the present invention.

Detailed Description

Referring to fig. 1, the phase change heat storage medium melting device of the invention comprises a heat preservation container 1; the heat-insulating container 1 is provided with an inlet 11 for solid phase-change heat storage medium to enter and an overflow port 14 for liquid phase-change heat storage medium to flow out; a group of heating pipe groups 2 for circulating combustion gas is arranged in the heat-insulating container 1; the exhaust port of the heating pipe set 2 extends out of the heat preservation container 1; a stirrer 3 is arranged on the heat preservation container 1; the driving device 31 of the stirrer 3 is fixedly arranged at the top of the heat preservation container 1, and the stirring shaft 32 of the stirrer 3 extends into the heat preservation container 1; the heating pipe group 2 is arranged at the bottom of the heat preservation container 1; the heat preservation container 1 is provided with two inlets for liquid phase change heat storage media to flow into, namely a first inlet 12 and a second inlet 13.

Referring to fig. 1 and 3, a jet pipe 4 for jetting liquid phase-change heat storage medium is arranged at the top inside the heat preservation container 1; the liquid inlet of the jet pipe 4 is communicated with the inlet 13; the jet pipe 4 is provided with a jet port 41.

The jet pipes 4 are distributed along the inner wall of the heat preservation container 1 and are annular.

The bottom of the heat-insulating container 1 is also provided with an electric heating device 5 for heating the phase-change heat storage medium.

Referring to fig. 1, the bottom of the heat-insulating container 1 is a settling zone, and a sewage outlet 15 for discharging the sediment in the settling zone is also arranged on the side wall of the heat-insulating container 1; the sewage discharge port 15 is connected with one end of a sewage discharge siphon pipe 16, and the other end of the sewage discharge siphon pipe 16 is arranged in the sedimentation zone.

Referring to fig. 4, the heated tube set 2 sequentially includes a heating chamber 21, a heating tube 22 and a smoke exhaust tube 23 connected integrally along the flow direction of the combustion gas; the heating cavity 21 penetrates through the heat-insulating container 1, and the smoke exhaust pipe 23 penetrates out of the heat-insulating container 1; and a heating nozzle is fixedly arranged on the heat-insulating container 1 and is opposite to the heating cavity 21. Of course, the heating tube 22 may be composed of a plurality of pieces, see fig. 5.

Referring to fig. 2, the phase-change heat storage medium melting system of the invention comprises the phase-change heat storage medium melting device, a heat exchange device 6 for heating the liquid phase-change heat storage medium, a low-temperature molten salt tank 7 and a buffer tank 8; the buffer tank 8 is provided with a pump for pumping the liquid phase-change heat storage medium in the buffer tank 8.

The overflow port 14 is communicated with the inlet of the buffer tank 8; the outlet of the buffer tank 8 is communicated with the liquid inlet of the heat exchange device 6; a liquid outlet of the heat exchange device 6 is respectively communicated with an inlet of the low-temperature molten salt tank 7 and a first inlet 12 through pipelines, and valves are arranged on the pipelines; the outlet of the low-temperature molten salt tank 7 is communicated with the second inlet 13 through a pipeline, and a high-pressure pump is arranged on the pipeline.

And a conveying belt 9 for conveying the solid phase-change heat storage medium to an inlet 11 of the heat preservation container 1.

The heat exchange device 6 is a solar oil-smoke heat exchanger.

The melting working process of the phase-change heat storage medium melting system is as follows:

firstly, a solid phase-change heat storage medium is thrown into the heat preservation container 1 from an inlet 11 through a conveying belt 9; then, the solid phase-change heat storage medium is heated and melted through the heating nozzle and the heating pipe group 2, and an electric heating device 5 can be used if necessary; then, the melted liquid phase-change heat storage medium is pumped out through the buffer tank 8 and is injected into the solar oil-smoke heat exchanger, the liquid phase-change heat storage medium is heated by using a solar mirror field, then the heated liquid phase-change heat storage medium is introduced into the low-temperature molten salt tank 7 to be stored, meanwhile, the low-temperature molten salt tank 7 injects the liquid phase-change heat storage medium into the jet pipe 4 through the high-pressure pump, and the jet pipe 4 injects the liquid phase-change heat storage medium into the heat preservation container 1 to be effectively mixed.

When the temperature in the heat-insulating container 1 and the liquid phase-change heat storage medium reach a certain amount, closing a valve between the heat exchange device 6 and an inlet of the low-temperature molten salt tank 7, and opening a valve between the heat exchange device 6 and the first inlet 12; at this time, the liquid phase-change heat storage medium from the heat exchange 6 is directly introduced into the jet pipe 4 to form circulation.

The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are only exemplary embodiments of the present invention, and are not intended to limit the present invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the protection scope of the present invention.