CN212058435U

CN212058435U - Fused salt heat exchanger core body of printed circuit board

Info

Publication number: CN212058435U
Application number: CN201921988484.XU
Authority: CN
Inventors: 高炜; 李红智; 张磊; 吴帅帅; 张一帆
Original assignee: Xian Thermal Power Research Institute Co Ltd
Current assignee: Xian Thermal Power Research Institute Co Ltd
Priority date: 2019-11-18
Filing date: 2019-11-18
Publication date: 2020-12-01
Anticipated expiration: 2029-11-18

Abstract

The utility model provides a printed circuit board fused salt heat exchanger core, includes from last a plurality of heat transfer medium passageways and a plurality of fused salt passageway of arranging down, the top and the bottom of heat transfer medium passageway and fused salt passageway are provided with the apron respectively, the fused salt passageway on press close to and arrange the heating channel, the heating channel in insert the heating band. The utility model discloses install heating device inside the heat exchanger, press close to fused salt one side more, can improve heat transfer effect for rate of heating simultaneously. It features high heat transfer resistance, high heat exchange coefficient and small size.

Description

Fused salt heat exchanger core body of printed circuit board

Technical Field

The utility model relates to a heat transfer device technical field, in particular to printed circuit board fused salt heat exchanger core.

Background

Printed circuit plate heat exchangers (PCHE) belong to the category of microchannel plate heat exchangers. The PCHE has the advantages of compact structure, high temperature resistance, heat transfer resistance, safety, reliability and the like, and is widely applied in the fields of refrigeration and air conditioning, petroleum and natural gas, nuclear industry, chemical industry, electric power industry and the like.

The heat exchange core body is a core component of the PCHE, and has the structural characteristics of a porous core body in appearance structure. The microchannels in the core provide flow channels for the heat transfer medium, while the matrix material (typically a metal sheet) in the core serves to transfer heat between the heat transfer medium and the molten salt. The PCHE core body mainly comprises the following processing technologies: firstly, the required micro-pore channels are processed on the metal sheet by using a (photo) chemical etching technology, and then a plurality of layers of metal sheets containing micro-channels are connected by using a diffusion welding technology to form a whole core body. The micro-channel heat exchanger processed by the diffusion welding technology has high strength, and the strength of a welding seam is equivalent to that of the body, so that the heat exchanger processed by the diffusion welding technology can bear heat transfer.

On the other hand, new energy sources such as solar energy and the like need a large amount of energy storage and heat exchange equipment with energy storage materials, and a large amount of energy storage and heat exchange equipment with energy storage materials are also needed in the aspects of peak shaving, valley electricity utilization, new energy power supply heat utilization and the like of a power station. At present, the most mature and common energy storage method is molten salt energy storage, the molten salt is heated by solar energy or other energy sources, the high-temperature molten salt is stored, and heat energy is taken out through heat exchange when needed. The common method for storing and exchanging heat of molten salt is to store the molten salt in a molten salt tank, drive the liquid molten salt by a molten salt pump, make the molten salt flow on the shell layer of a shell-and-tube heat exchanger, and exchange heat with a heat transfer medium on the tube side. The problem is that the whole process must ensure that the molten salt is in a high temperature liquid state, which once solidified causes irreversible destructive losses, thus requiring heat tracing of the equipment (valves, joints, etc.) and pipes through which the molten salt flows, and strict temperature monitoring. However, the current practice is to wind the heat tracing band around the outside of the equipment or pipeline, and the heat conduction from the outside to the inside takes a long time, and the heating amount is also large.

Disclosure of Invention

In order to solve the technical problems, the utility model aims to provide a fused salt heat exchanger core of a printed circuit board, a heat transfer medium channel of the heat exchanger core is processed by adopting PCHE technology, heat transfer can be resisted, the heat exchange coefficient is high, and the volume is small; a heating channel is added in the middle of the molten salt flowing channel, and a heating belt is installed in the heating channel and used for improving the heat transfer effect and accelerating the heating speed.

In order to realize the purpose, the utility model discloses a technical scheme is:

the utility model provides a printed circuit board fused salt heat exchanger core, includes from last a plurality of heat transfer medium passageway 1 and a plurality of fused salt passageway 2 of arranging down, the top and the bottom of heat transfer medium passageway 1 and fused salt passageway 2 are provided with apron 5 respectively, fused salt passageway 2 on press close to and have arranged heating channel 3, heating channel 3 in insert heating band 4.

The heat transfer medium channel 1 and the molten salt channel 2 are both micro-channels etched on the metal plate surface.

And the heat transfer medium channel 1, the molten salt channel 2 and the heating channel 3 are welded and processed by adopting a vacuum diffusion welding process.

The layer of heat transfer medium channel 1 corresponds to at least one layer of molten salt channel 2 or the layer of molten salt channel 2 corresponds to at least one layer of heat transfer medium channel 1.

When the multilayer molten salt channel 2 corresponds to the layer of heat transfer medium channel 1, the heating channel 3 is arranged between the multilayer molten salt channel 2, the heating channel 3 is a wider straight channel,

the heat transfer medium channel 1 may have a channel shape and size different from those of the molten salt channel 2, but the rib cross-sectional shapes are the same.

The heating channel 3 is provided with a middle rib.

The heat transfer medium channel 1 and the molten salt channel 2 are straight channels, Z-shaped channels, S-shaped channels or wing-shaped channels.

A method for using a printed circuit board molten salt heat exchanger comprises the steps of electrifying a heating belt 4 to preheat the heat exchanger before molten salt is poured into the heat exchanger, ensuring that each layer of molten salt channel 2 is heated, and introducing the molten salt after a heat exchanger body meets the molten salt preheating requirement; in the use, when the fused salt temperature is lower than the temperature lower limit value, the heating belt 4 is electrified for heating, the temperature of each layer of fused salt channel 2 is guaranteed to be maintained above the temperature lower limit value, the used fused salt channel 2 is guaranteed to be smooth, the fused salt is not condensed in the use process, and when the heating belt is aged and damaged, the power can be cut off, and the fused salt can be extracted from the heating channel for replacement.

The utility model has the advantages that:

(1) the heat transfer performance of the molten salt is enhanced: the utility model discloses well one deck heat transfer medium passageway corresponds a plurality of layers of fused salt passageway, and the metal sheet layer between the fused salt passageway is exactly the fin that the heat transfer effect is very obvious of reinforceing, and these miniature fins are cut apart the fused salt in the subchannel, and consequently every subchannel's heat transfer is all more even, and the local heat transfer that can not appear pressing close to the wall is good, keeps away from the local poor condition of heat transfer of wall.

(2) The heating effect is strengthened: the utility model discloses a heating channel and heating band are in the middle of the fused salt passageway to a plurality of layers of every just can arrange proper amount heating band, assurance heating effect that like this can furthest, and avoided the whole conduction from the outside to the center of heating power, rate of heating is fast.

Drawings

Fig. 1 is the schematic diagram of the core structure of the present invention.

Fig. 2 is a schematic view of a heat transfer medium passage structure.

FIG. 3 is a schematic diagram of a molten salt channel structure.

Fig. 4 is a schematic view of a heating channel structure.

FIG. 5 is a schematic view showing the flow direction of the molten salt and the heat transfer medium.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

As shown in fig. 1: a core body of a fused salt heat exchanger of a printed circuit board is composed of a plurality of heat transfer medium channels 1, a plurality of fused salt channels 2, a plurality of heating channels 3, a plurality of heating belts 4 and upper and lower cover plates. The heat transfer medium channel 1, the molten salt medium channel 2 and the heating channel 3 are formed by etching corresponding channels on the plate and then welding by a vacuum diffusion welding process. By adopting the heat exchanger processed by the combination, when the molten salt needs to be heated, all heat is prevented from being conducted from the outer surface to the center, the heat exchanger can be better heated, and the heating speed is high. When the molten salt heat exchanger works, a heat transfer medium flows from one end of the heat transfer medium channel 1 to the other end, molten salt flows from one side of the molten salt channel 2 to the other side, and the heat transfer medium and the molten salt are in counter flow at the center of the heat exchanger. The heating channel 3 is arranged in the middle of the molten salt channel 2.

Install heating device inside the heat exchanger, press close to fused salt one side more, can improve heat transfer effect, accelerate rate of heating simultaneously.

As shown in fig. 2 and fig. 3: the heat transfer medium channel 1 and the molten salt channel 2 are both micro-channels etched on a metal plate surface, and the channels with small size can be processed by etching without damaging the surface smoothness. The channel shape and the size of the heat transfer medium channel 1 can be different from those of the molten salt channel 2, but the rib section shapes of the heat transfer medium channel and the molten salt channel are basically the same, so that the welding quality is ensured.

The heat transfer medium channel 1 and the molten salt channel 2 are straight channels, Z-shaped channels, S-shaped channels or wing-shaped channels, and the specific form can be determined according to the heat exchange requirement.

As shown in fig. 4: the heating channel 3 is provided with a middle rib to ensure the welding quality.

As shown in fig. 5, fig. 5 only shows the flow direction when the high-temperature molten salt heats the heat transfer medium, and when the high-temperature heat transfer medium is required to heat the molten salt, the flow directions of the two in the channels may be opposite.

Claims

1. The utility model provides a printed circuit board fused salt heat exchanger core, its characterized in that includes from last a plurality of heat transfer medium passageway (1) and a plurality of fused salt passageway (2) of arranging down, the top and the bottom of heat transfer medium passageway (1) and fused salt passageway (2) are provided with apron (5) respectively, fused salt passageway (2) on press close to and arrange heating channel (3), heating channel (3) in insert heating band (4).

2. The printed circuit board molten salt heat exchanger core body as claimed in claim 1, wherein the heat transfer medium channel (1) and the molten salt channel (2) are micro-channels etched on a metal plate surface.

3. The printed circuit board molten salt heat exchanger core body as claimed in claim 1, wherein the heat transfer medium channel (1), the molten salt channel (2) and the heating channel (3) are welded by a vacuum diffusion welding process.

4. A printed circuit board molten salt heat exchanger core as claimed in claim 1, wherein the layer of heat transfer medium channels (1) corresponds to at least one layer of molten salt channels (2) or the layer of molten salt channels (2) corresponds to at least one layer of heat transfer medium channels (1).

5. The printed circuit board molten salt heat exchanger core body as claimed in claim 4, wherein the heating channel (3) is arranged in the middle of the multilayer molten salt channel (2) when the multilayer molten salt channel (2) corresponds to one layer of heat transfer medium channel (1), and the heating channel (3) is a wider straight channel.

6. A printed circuit board molten salt heat exchanger core as claimed in claim 1, characterised in that the heat transfer medium channels (1) may be of different channel shape and dimensions from the molten salt channels (2) but have the same rib cross-sectional shape.

7. A printed circuit board molten salt heat exchanger core as claimed in claim 1, characterised in that the heating channel (3) is provided with intermediate ribs.

8. The printed circuit board molten salt heat exchanger core body as claimed in claim 1, wherein the heat transfer medium channel (1) and the molten salt channel (2) are straight channels, zigzag channels, S-shaped channels or airfoil-shaped channels.