阅读说明：本技术 一种用于塔式光热电站的增温换热系统 (A heat transfer system that heats for tower light and heat power station ) 是由 黄其 章晓敏 宓霄凌 王伊娜 其他发明人请求不公开姓名 于 2021-08-31 设计创作，主要内容包括：一种用于塔式光热电站的增温换热系统,包括：熔盐换热器,熔盐换热器将熔盐热量转移至气体工质,熔盐换热器设置有气体工质出口；涡流管装置,涡流管装置的进气口与气体工质出口连通；气体驱动组件,设置在熔盐换热器和涡流管装置之间,以驱动熔盐换热器中的气体工质进入涡流管装置；气体换热组件,气体换热组件的进气口与涡流管装置的热流出口连通,且气体换热组件中设有SCO-(2)换热流道。该增温换热系统可通过现有熔盐换热器加热超临界二氧化碳使其达到工作温度,工程应用适用性强。(A warming and heat exchanging system for a tower type photo-thermal power station, comprising: the molten salt heat exchanger transfers the molten salt heat to a gas working medium and is provided with a gas working medium outlet; the gas inlet of the vortex tube device is communicated with the gas working medium outlet; a gas drive assembly disposed between the molten salt heat exchanger and the vortex tube device to drive the molten saltGas working medium in the heat exchanger enters the vortex tube device; the gas heat exchange assembly is provided with an SCO (silicon controlled oxide) inside, and a gas inlet of the gas heat exchange assembly is communicated with a heat flow outlet of the vortex tube device 2 And a heat exchange flow channel. The temperature-increasing heat exchange system can heat the supercritical carbon dioxide to reach the working temperature through the existing molten salt heat exchanger, and has strong engineering application applicability.)

1. A heat exchange system that heats for tower light and heat power station which characterized in that includes:

the molten salt heat exchanger (1) transfers molten salt heat to a gas working medium, and the molten salt heat exchanger (1) is provided with a gas working medium outlet;

the gas inlet of the vortex tube device (2) is communicated with the gas working medium outlet;

the gas driving assembly is arranged between the molten salt heat exchanger (1) and the vortex tube device (2) and is used for driving the gas working medium in the molten salt heat exchanger (1) to enter the vortex tube device (2);

the gas inlet of the gas heat exchange assembly is communicated with the heat flow outlet (4) of the vortex tube device (2), and SCO is arranged in the gas heat exchange assembly₂And a heat exchange flow channel.

2. The heating and heat exchange system for the tower type photo-thermal power station as claimed in claim 1, wherein the cold flow outlet (3) of the vortex tube device (2) and the gas outlet of the gas heat exchange assembly are both communicated with the gas working medium inlet of the molten salt heat exchanger (1).

3. The heating and heat exchanging system for the tower type photo-thermal power station as claimed in claim 2, characterized by comprising a buffer container (5), wherein an inlet of the buffer container (5) is communicated with a cold flow outlet (3) of the vortex tube device (2), an outlet of the buffer container (5) is communicated with the gas working medium inlet of the molten salt heat exchanger (1), the buffer container (5) is provided with a semiconductor temperature difference power generation device (6), and the semiconductor temperature difference power generation device (6) is electrically connected with the gas driving assembly.

4. The warming and heat exchanging system for the tower type photo-thermal power station as claimed in claim 2, characterized by comprising a mixing vessel (7), wherein the cold flow outlet (3) of the vortex tube device (2) and the gas outlet of the gas heat exchanging assembly are both communicated with the mixing vessel (7), and the outlet of the mixing vessel (7) is communicated with the gas working medium inlet of the molten salt heat exchanger (1).

5. The heating and heat exchange system for a tower-type photothermal power station according to claim 1, wherein said gas heat exchange assembly comprises a plurality of SCOs₂The nozzle (8) is arranged opposite to the heat exchange flow channel; one end of the nozzle (8) is communicated with the heat flow outlet (4) of the vortex tube device (2), and the other end of the nozzle extends into the gas heat exchange assembly.

6. The warming heat exchange system for a tower-type photothermal power station according to claim 5, wherein the nozzles (8) are perpendicular to the SCO₂The heat exchange flow channel is arranged.

7. The warming heat exchange system for a tower-type photothermal power station according to claim 1, wherein the gas heat exchange assembly comprises a heat exchange container (9) and a gas heat exchange tube (10), the SCO₂The heat exchange flow channel is arranged in the heat exchange container (9) in a penetrating way.

8. The heating and heat exchange system for the tower type photo-thermal power station as claimed in claim 1, wherein a plurality of molten salt heat exchange tubes (11) are arranged in the molten salt heat exchanger (1), and the system further comprises:

the gas working medium distributor (12) is provided with an inlet and a plurality of outlets, the inlet of the gas working medium distributor (12) is communicated with the cold flow outlet (3) of the vortex tube device (2) and the gas outlet of the gas heat exchange assembly, and the outlets of the gas working medium distributor (12) are respectively communicated with the inlet of one molten salt heat exchange tube (11);

the molten salt heat exchange tube comprises a gas collector (13), wherein the gas collector (13) is provided with a plurality of inlets and an outlet, the inlets of the gas collector (13) are respectively communicated with the outlet of one molten salt heat exchange tube (11), and the outlet of the gas collector (13) is communicated with the gas inlet of the vortex tube device (2).

9. The warming heat exchange system for a tower-type photothermal power station according to claim 1, wherein the gas driving component is a gas pump (14).

Technical Field

The invention belongs to the technical field of photo-thermal power generation, and particularly relates to a heating and heat exchange system for a tower type photo-thermal power station.

Background

The tower type photo-thermal power generation technology is entering the application research and development stage of the third generation technology, wherein the supercritical carbon dioxide power generation technology is one of the main selection directions of the power generation system. The supercritical carbon dioxide power generation technology utilizes a molten salt heat exchange system to heat supercritical carbon dioxide.

In a supercritical carbon dioxide power generation system, the requirement on the temperature of supercritical carbon dioxide before entering a turbine is high and needs to reach 620 ℃ or above, but the existing molten salt heat exchange system (with the heat storage temperature of 565 ℃) cannot meet the working temperature requirement of the supercritical carbon dioxide.

If a method of changing the front-stage heat storage medium to increase the heat storage temperature is adopted, for example, particles or novel high-temperature molten salt (working temperature up to 650 ℃ and above) is adopted, the two will face certain problems: (1) the particle technology is still in an exploration stage, and the technology is not mature enough; (2) the high-temperature molten salt is in a research and development stage, and the existing high-temperature molten salt has strong corrosivity and cannot meet the requirement; meanwhile, if high-temperature molten salt is put into use, the cost of the related equipment is expected to be increased by 1 time or more.

Disclosure of Invention

In order to solve the problems, the invention aims to provide a temperature-increasing heat exchange system for a tower type photo-thermal power station, the temperature-increasing heat exchange system can heat supercritical carbon dioxide to reach the working temperature through the existing molten salt heat exchanger, and the engineering application applicability is strong.

In order to achieve the purpose, the technical scheme of the invention is as follows:

a warming and heat exchanging system for a tower type photo-thermal power station, comprising:

the molten salt heat exchanger transfers molten salt heat to a gas working medium and is provided with a gas working medium outlet;

the gas inlet of the vortex tube device is communicated with the gas working medium outlet;

the gas driving assembly is arranged between the molten salt heat exchanger and the vortex tube device and is used for driving the gas working medium in the molten salt heat exchanger to enter the vortex tube device;

the gas heat exchange assembly is provided with an SCO (temperature dependent operating System) and a heat flow outlet communicated with the gas inlet of the gas heat exchange assembly₂And a heat exchange flow channel.

According to an embodiment of the invention, the cold flow outlet of the vortex tube device and the gas outlet of the gas heat exchange assembly are both communicated with the gas working medium inlet of the molten salt heat exchanger.

According to an embodiment of the invention, the device comprises a buffer container, wherein an inlet of the buffer container is communicated with a cold flow outlet of a vortex tube device, an outlet of the buffer container is communicated with a gas working medium inlet of a molten salt heat exchanger, the buffer container is provided with a semiconductor temperature difference power generation device, and the semiconductor temperature difference power generation device is electrically connected with a gas driving assembly.

According to an embodiment of the invention, the molten salt heat exchanger comprises a mixing container, wherein a cold flow outlet of the vortex tube device and a gas outlet of the gas heat exchange assembly are both communicated with the mixing container, and an outlet of the mixing container is communicated with the gas working medium inlet of the molten salt heat exchanger.

According to an embodiment of the present invention, the gas heat exchange assembly is provided with a plurality of SCOs₂The nozzles are arranged opposite to the heat exchange flow channels; one end of the nozzle is communicated with a heat flow outlet of the vortex tube device, and the other end of the nozzle extends into the gas heat exchange assembly.

According to an embodiment of the invention, the nozzle is perpendicular to the SCO₂The heat exchange flow channel is arranged.

According to an embodiment of the present invention, the gas heat exchange assembly comprises a heat exchange container and a gas heat exchange tube, and the SCO₂The heat exchange flow channel is arranged in the heat exchange container in a penetrating way.

According to an embodiment of the present invention, the molten salt heat exchanger is provided with a plurality of molten salt heat exchange pipes, and further includes:

the gas working medium distributor is provided with an inlet and a plurality of outlets, the inlet of the gas working medium distributor is communicated with the cold flow outlet of the vortex tube device and the gas outlet of the gas heat exchange assembly, and the outlets of the gas working medium distributor are respectively communicated with the inlet of one molten salt heat exchange tube;

the gas collector is provided with a plurality of inlets and an outlet, the inlets of the gas collector are respectively communicated with the outlet of the fused salt heat exchange tube, and the outlet of the gas collector is communicated with the gas inlet of the vortex tube device.

According to an embodiment of the present invention, the air driving assembly is an air pump.

Due to the adoption of the technical scheme, compared with the prior art, the invention has the following advantages and positive effects:

(1) in the embodiment of the invention, the supercritical carbon dioxide can be heated to the working temperature by combining the vortex tube device with the existing molten salt heat exchanger, so that the solar salt heat storage and exchange system and the supercritical carbon dioxide power generation system can be matched for use, and the heat storage and exchange molten salt medium does not need to be replaced, so that the engineering application applicability is strong.

(2) In the embodiment of the invention, the buffer container and the semiconductor temperature difference power generation device are arranged to carry out semiconductor temperature difference power generation, so that a certain amount of electric energy can be provided for the gas driving assembly to use. In addition, the temperature and flow conditions of the gas working medium can be judged through the generated energy of semiconductor thermoelectric power generation, and a certain regulation and control feedback effect is achieved.

(3) The mixing container is arranged in the embodiment of the invention, so that the low-temperature gas working medium from the cold flow outlet of the vortex tube device can be neutralized with the high-temperature gas working medium from the gas outlet of the gas heat exchange assembly, and then the neutralized low-temperature gas working medium is circulated to enter the molten salt heat exchanger, thereby avoiding the influence of the low-temperature gas working medium entering the molten salt heat exchanger on the heat exchange efficiency.

(4) The nozzle is arranged in the embodiment of the invention, under the action of the nozzle, the flow velocity of the gas working medium is intensified, the turbulence is improved, the impact jet flow is formed to exchange heat with the supercritical carbon dioxide in the SCO2 heat exchange flow channel, and the heat exchange efficiency is greatly improved; and the nozzle is vertical to the SCO2 heat exchange flow channel, so that the heat exchange is further enhanced.

Drawings

The following detailed description of embodiments of the invention is provided in conjunction with the appended drawings, in which:

FIG. 1 is a general schematic diagram of a temperature-increasing heat exchange system for a tower-type photothermal power station according to the present invention.

Description of reference numerals:

1: a molten salt heat exchanger; 2: a vortex tube device; 3: a cold flow outlet; 4: a hot fluid outlet; 5: a cache container; 6: a semiconductor thermoelectric power generation device; 7: a mixing vessel; 8: a nozzle; 9: a heat exchange vessel; 10: a gas heat exchange tube; 11: a molten salt heat exchange pipe; 12: a gas working medium distributor; 13: a gas collector; 14: an air pump; 15: introducing molten salt into a pipe; 16: discharging a molten salt pipe; 17: a vortex chamber; 18: a first return pipe; 19: a second return pipe; 20: a third return line.

Detailed Description

The invention is described in further detail below with reference to the figures and specific examples. Advantages and features of the present invention will become apparent from the following description and from the claims. It is to be noted that the drawings are in a very simplified form and are all used in a non-precise ratio for the purpose of facilitating and distinctly aiding in the description of the embodiments of the invention.

It should be noted that all the directional indicators (such as up, down, left, right, front, and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the movement situation, etc. in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indicator is changed accordingly.

Referring to fig. 1, the core of the invention is to provide a warming and heat exchanging system for a tower type photo-thermal power station, which comprises a molten salt heat exchanger 1, a vortex tube device 2, a gas driving assembly and a gas heat exchanging assembly.

The molten salt heat exchanger 1 is a device of the existing solar salt heat storage and exchange system, and the molten salt heat exchanger 1 is filled with molten salt and is provided with a molten salt inlet pipe 15 and a molten salt outlet pipe 16. The fused salt heat exchanger 1 transfers fused salt heat to a gas working medium, and the fused salt heat exchanger 1 is provided with a gas working medium outlet and a gas working medium inlet. Be equipped with a plurality of fused salt heat exchange tubes 11 in the fused salt heat exchanger 1, set up 4 altogether in this embodiment, gaseous working medium passes through fused salt heat exchange tube 11 and fused salt heat transfer.

Specifically, the upper part of the molten salt heat exchanger 1 is provided with a gas working medium distributor 12, and the lower part is provided with a gas collector 13. The gas working medium distributor 12 is provided with an inlet and a plurality of outlets, and the inlet of the gas working medium distributor 12 is communicated with the cold flow outlet 3 of the vortex tube device 2 and the gas outlet of the gas heat exchange assembly. The outlets of the gas working medium distributor 12 are 4 in the embodiment and are respectively communicated with the inlet of one molten salt heat exchange tube 11. The gas working medium inlet of the molten salt heat exchanger 1 is the inlet of the gas working medium distributor 12.

The gas collector 13 is provided with a plurality of inlets and an outlet, in the embodiment, the number of the inlets of the gas collector 13 is 4, and the inlets are respectively communicated with the outlet of one molten salt heat exchange tube 11, and the outlet of the gas collector 13 is communicated with the inlet of the vortex tube device 2. And the gas working medium outlet of the molten salt heat exchanger 1 is the outlet of the gas collector 13. The gas driving component is arranged between the molten salt heat exchanger 1 and the vortex tube device 2, specifically in a pipeline of the gas collector 13 close to the vortex tube device 2, and the gas driving component is a gas pump 14 in the embodiment. The air pump 14 drives the gas working medium in the molten salt heat exchange tube 11 and the gas working medium distributor 12 in the molten salt heat exchanger 1 to enter the vortex tube device 2. The gas working medium is air in this embodiment.

The vortex tube device 2 comprises a vortex chamber 17 and an air inlet, a cold fluid outlet 3 and a hot fluid outlet 4 which are communicated with the vortex chamber 17. The gas working fluid entering the vortex tube assembly 2 from the inlet port will separate into two streams as it flows through the vortex chamber 17. One of the two is hot fluid, and the temperature of the hot fluid is greatly increased on the basis of the temperature of the original gas; the other stream is cold fluid, the temperature of which will be much lower than the temperature of the raw gas just entering the vortex tube device 2. Hot fluid flows out of the hot fluid outlet 4 and cold fluid flows out of the cold fluid outlet 3.

The gas inlet of the gas heat exchange component is communicated with the heat flow outlet 4 of the vortex tube device 2, and SCO is arranged in the gas heat exchange component₂And a heat exchange flow channel. The cold flow outlet 3 of the vortex tube device 2 and the gas outlet of the gas heat exchange assembly are communicated with the inlet of the gas working medium distributor 12 so as to realize the circulation of the gas working medium.

Specifically, the gas heat exchange assembly comprises a heat exchange container 9, a gas heat exchange tube 10, the gas heat exchange tube 10 and an SCO₂A heat exchange flow passage is arranged in the heat exchange container 9 in a penetrating way, SCO₂A heat exchange flow passage formed in the gas heat exchange tube 10, SCO₂Supercritical carbon dioxide is introduced into the heat exchange flow channel.

A plurality of nozzles 8 which are arranged opposite to the gas heat exchange tubes 10 are arranged in the heat exchange container 9, one end of each nozzle 8 is communicated with the heat flow outlet 4 of the vortex tube device 2, and the other end of each nozzle 8 extends into the heat exchange container 9. In the present embodiment, three nozzles 8 are provided, and the nozzles 8 are perpendicular to the gas heat exchange tubes 10 and SCO therein₂The heat exchange flow channel is vertically arranged, and gas working media vertically and directly inject to the gas heat exchange tube 10 after entering the heat exchange container 9 through the nozzle 8. The nozzle 8 is designed and is vertically arranged with the gas heat exchange tube 10, so that an impact jet state is formed, and heat transfer enhancement is facilitated.

A cold flow outlet 3 of the vortex tube device 2 is also provided with a buffer container 5, an inlet of the buffer container 5 is communicated with the cold flow outlet 3 of the vortex tube device 2, an outlet of the buffer container 5 is communicated with an inlet of the gas working medium distributor 12, the buffer container 5 is provided with a semiconductor temperature difference power generation device 6, and the semiconductor temperature difference power generation device 6 is electrically connected with an air pump 14. The semiconductor temperature difference power generation device 6 performs semiconductor temperature difference power generation through the temperature difference between the gas working medium and the external environment, and provides a certain amount of electric energy for the gas pump 14 to use. In addition, the temperature and flow conditions of the gas working medium can be judged through the generated energy of the semiconductor temperature difference power generation device 6, and a certain regulation and control feedback effect is achieved.

The system further comprises a mixing container 7, the outlet of the buffer container 5 is communicated with the mixing container 7 through a first return pipe 18, the outlet of the heat exchange container 9 is communicated with the mixing container 7 through a second return pipe 19, and the outlet of the mixing container 7 is communicated with the inlet of the gas working medium distributor 12 through a third return pipe 20. The low-temperature gas working medium flowing out of the cold flow outlet 3 of the vortex tube device 2 and flowing through the buffer container 5 can be subjected to temperature neutralization with the high-temperature gas working medium flowing out of the outlet of the heat exchange container 9, and then enters the gas working medium distributor 12 for circulation after neutralization, so that the problem that the low-temperature gas working medium enters the molten salt heat exchange tube 11 in the molten salt heat exchanger 1 to influence the heat exchange efficiency can be avoided.

The working process of the present invention is further explained as follows:

firstly, molten salt is introduced into the molten salt heat exchanger 1 to store heat, and the gas pump 14 drives the gas working medium in the gas working medium distributor 12 to flow into each molten salt heat exchange tube 11 to exchange heat with the molten salt to raise the temperature.

The gas working medium after heat exchange and temperature rise flows through the gas collector 13 and the gas pump 14 and then enters the vortex tube device 2. After entering the vortex tube device 2, the gas working medium enters the vortex chamber 17, and two gas flows of hot gas working medium and cold gas working medium are separated.

The hot gas working medium enters the nozzle 8 in the heat exchange container 9 through the heat flow outlet 4, the flow velocity of the hot gas working medium is intensified under the action of the nozzle 8, the turbulence degree is improved, and the hot gas working medium is sprayed to the gas heat exchange tube 10 in an impact jet flow mode and exchanges heat with supercritical carbon dioxide in the gas heat exchange tube, so that the heat exchange efficiency is greatly improved. Meanwhile, the temperature of the hot gas working medium is far higher than 565 ℃, and can reach 700 ℃ and above, so that the temperature requirement of supercritical carbon dioxide heat exchange is met. The hot gas working medium after heat exchange with the supercritical carbon dioxide flows from the outlet of the heat exchange container 9 through the second return pipe 19 and enters the mixing container 7.

The cold gas working medium of the vortex tube device 2 enters the buffer container 5 through the cold flow outlet 3, and the semiconductor temperature difference power generation device 6 performs semiconductor temperature difference power generation through the temperature difference between the cold gas working medium and the external environment, and provides a certain amount of electric energy for the gas pump 14 to use. The cold gaseous working medium exiting from the buffer vessel 5 enters the mixing vessel 7 via the first return pipe 18.

The hot gas working medium and the cold gas working medium are mixed in the mixing container 7 and then enter the gas working medium distributor 12 through the third return pipe 20 to carry out the next cycle.

The supercritical carbon dioxide power generation system can heat the supercritical carbon dioxide to the working temperature by combining the vortex tube device 2 with the existing molten salt heat exchanger 1, so that the turbine inlet temperature of the supercritical carbon dioxide power generation system reaches 620 ℃ or above.

Through the additional heating device, the matching use of the existing mature solar salt heat storage and exchange system and the supercritical carbon dioxide power generation system is realized, the solar salt heat storage and exchange system is continuously used, so that the heat storage and exchange molten salt medium does not need to be replaced, the technology is mature, and the engineering application applicability is strong. And the temperature increasing device based on the vortex tube principle has a simple and compact structure and is beneficial to maintenance.

The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments. Even if various changes are made to the present invention, it is still within the scope of the present invention if they fall within the scope of the claims of the present invention and their equivalents.