U-tube type high-temperature corrosion-resistant phase change heat storage heat exchanger

Abstract

The utility model provides a U pipe type high-temperature corrosion-resistant phase change heat storage heat exchanger which comprises a graphite pipe unit, a heat storage unit and a shell which are arranged from inside to outside, and the graphite pipe unit, the heat storage unit and the bottom of the shell are arranged at intervals in the vertical direction. The graphite pipe unit is suspended in the heat storage unit; the heat storage unit is hung in the shell, and the problem that the graphite pipe is damaged due to the fact that the graphite pipe is prone to expansion caused by heat and contraction caused by cold in the heat exchange process is solved.

Description

Technical Field

[0001] This utility model relates to the field of phase change heat storage technology, and in particular to a U-tube type high-temperature corrosion-resistant phase change heat storage heat exchanger. Background Technology

[0002] Currently, the mainstream phase change heat exchangers are roughly divided into three categories: shell and tube type, packed bed type, and plate type; the corresponding heat storage units used are shell and tube type heat storage unit, capsule type heat storage unit, and plate type heat storage unit, respectively. Among them, plate type heat exchangers have advantages such as high heat transfer coefficient, compact structure and low heat loss, but they are mainly limited by poor sealing performance caused by the difficulty of the sealing material to resist corrosion for a long time, as well as problems such as easy clogging and difficulty in cleaning caused by the structure itself.

[0003] Chinese patent CN206430607U discloses a graphite tube heat exchanger with surface-strengthened heat exchange tubes, comprising a plurality of graphite heat exchange tubes; the outer surface of the graphite heat exchange tubes is provided with spiral grooves, and the outer surface of the graphite heat exchange tubes with spiral grooves is coated with a ceramic coating of equal thickness; the inner surface of the graphite heat exchange tubes is provided with a plurality of equally spaced strip-shaped grooves, the strip-shaped grooves are filled with ceramic material, and the ceramic material forms strip-shaped protrusions; through holes are provided in the strip-shaped grooves, and connecting posts made of ceramic material are provided in the through holes, one end of the connecting posts is connected to the ceramic coating, and the other end of the connecting posts is connected to the strip-shaped protrusions.

[0004] However, this technical solution has the problem that the graphite tube is prone to thermal expansion and contraction during the heat exchange process, which can cause damage to the graphite tube. Utility Model Content

[0005] The purpose of this invention is to address the shortcomings of existing technologies by providing a U-tube type high-temperature corrosion-resistant phase change heat exchanger. Through a special connection method and structural design between the graphite tube unit, the heat storage unit, and the shell, the problem of graphite tube damage caused by thermal expansion and contraction during heat exchange is solved.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A U-tube type high-temperature corrosion-resistant phase change heat exchanger includes a graphite tube unit, a heat storage unit and a shell arranged from the inside to the outside, and the graphite tube unit, the heat storage unit and the shell are spaced apart at the bottom along the vertical direction.

[0008] The graphite tube unit is suspended inside the heat storage unit;

[0009] The heat storage unit is suspended inside the casing.

[0010] Preferably, the graphite tube unit consists of several graphite tubes evenly spaced and suspended on the graphite perforated plate of the heat storage unit by connectors.

[0011] Preferably, the graphite perforated plate is provided with a plurality of mounting slots; the graphite perforation includes an inflow area and an outflow area, with HTF flowing in from the inflow area and flowing out from the outflow area.

[0012] Preferably, the graphite tube suspension section has a T-shaped structure and the lower ends of two adjacent groups of graphite tubes are detachably connected by a connecting pipe, forming a U-shaped tube structure with the two groups of graphite tubes and the connecting pipe.

[0013] Preferably, the connector includes a locking key that engages with the diameter change of the graphite tube.

[0014] Preferably, a non-metallic fiber insulation layer is provided between the heat storage unit and the shell.

[0015] Preferably, the heat storage unit, graphite perforated plate, and graphite tube unit are all made of graphite material, and both their inner and outer surfaces are coated with a dense silicon carbide coating.

[0016] Preferably, the upper end cap of the housing includes an inlet area, an outlet area, and an instrument area.

[0017] Preferably, the upper end cap of the housing is provided with an HTF inlet / outlet interface.

[0018] As another preferred embodiment, the housing is provided with legs on its exterior.

[0019] The beneficial effects of this utility model are as follows:

[0020] (1) The present invention uses graphite materials for the heat storage unit, graphite perforated plate and graphite tube unit, and must coat the inner and outer surfaces with a dense ceramic coating to make graphite a high temperature resistant, corrosion resistant and impermeable material. The dense silicon carbide coating makes the surface smooth and not easy to scale, which is convenient for disassembly and cleaning. Individual heat storage units can be replaced in a targeted manner if damaged, and the maintenance cost is low.

[0021] (2) This utility model uses graphite tube units, heat storage units and the bottom of the shell to be spaced apart along the vertical direction. It can be used to release the thermal expansion stress of the graphite tube units and heat storage units after they are heated. At the same time, the graphite tubes are arranged inside the heat storage unit, and the arrangement is more flexible and varied. The flow field of HTF can be adjusted by changing the suspension angle and density to form turbulence, thereby improving the heat exchange efficiency.

[0022] In summary, this utility model has the advantages of high equipment performance and long service life. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0024] Figure 2 This is a cross-sectional structural diagram of the present invention;

[0025] Figure 3 This is a schematic diagram of the heat storage unit of this utility model;

[0026] Figure 4 This is a schematic diagram of the connector structure of this utility model. Figure 1 ;

[0027] Figure 5 This is a schematic diagram of the connector structure of this utility model. Figure 2 ;

[0028] Figure 6 This is a schematic diagram of the graphite tube of this utility model;

[0029] Figure 7 This is a cross-sectional view of the connector of this utility model. Detailed Implementation

[0030] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0031] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0032] Example 1

[0033] like Figure 1-2As shown, this embodiment provides a U-tube type high-temperature corrosion resistant phase change heat exchanger, including a graphite tube unit 1, a heat storage unit 2 and a shell 3 arranged from the inside to the outside, and the graphite tube unit 1, the heat storage unit 2 and the shell 3 are spaced apart at the bottom along the vertical direction.

[0034] The graphite tube unit 1 is suspended inside the heat storage unit 2;

[0035] The heat storage unit 2 is suspended inside the housing 3.

[0036] It should be noted that the heat storage unit 2 in this application adopts a tank-type structure, and its shape can be rectangular or other shapes.

[0037] In this application, the graphite tube unit 1, the heat storage unit 2, and the bottom of the shell 3 are spaced apart along the vertical direction. The purpose of this arrangement is to release the thermal expansion stress of the graphite tube unit 1 and the heat storage unit 2 after they are heated. At the same time, the graphite tube 101 is arranged inside the heat storage unit, and the arrangement is more flexible and varied. The flow field of the HTF can be adjusted by changing the suspension angle and density to form turbulence, thereby improving the heat exchange efficiency.

[0038] Furthermore, the graphite tube unit 1 is composed of several graphite tubes 101 evenly spaced and suspended on the graphite perforated plate 21 of the heat storage unit 2 by the connector 4.

[0039] It should be noted that by arranging multiple graphite tubes 101, the heat exchange area can be increased, thereby improving the heat exchange efficiency.

[0040] Furthermore, such as Figure 3 As shown, the graphite perforated plate 21 has a plurality of mounting grooves 20; the graphite perforated plate 21 includes an inflow area 201 and an outflow area 202, and HTF flows in from the inflow area 201 and flows out from the outflow area 202.

[0041] A feeding zone 203 is provided between two adjacent inflow zones 201 and outflow zones 202.

[0042] It should be noted that the filler between the graphite tube 101 and the heat storage unit 2 enters through the feed area 203, where HTF can be liquid or gas.

[0043] In addition to feeding, the feed area 203 also serves as the insertion hole for the PCM thermometer.

[0044] Furthermore, such as Figure 6 As shown, the upper part of the graphite tube 101 is a T-shaped structure and the lower ends of two adjacent sets of graphite tubes 101 are detachably connected by a connecting pipe 102. The two sets of graphite tubes 101 and the connecting pipe 102 form a U-shaped tube structure.

[0045] In this application, the U-tube structure can solve the problem of thermal stress that cannot be released due to the different coefficients of linear expansion of different materials after heating.

[0046] The graphite tube 101 and the connecting tube 102 are coated with a dense silicon carbide coating on both their inner and outer surfaces. By using graphite and a dense coating, the heat storage unit 2 can be used in harsher environments, including the corrosion of PCM, the corrosion of HTF, and a higher heat storage temperature range.

[0047] Furthermore, such as Figure 4-7 As shown, the connector 4 includes a snap button 40 that matches and engages with the diameter change of the graphite tube 101.

[0048] It is worth mentioning that the graphite tube 101 and the mounting groove 20 are fixed together by a snap key 40 and a special graphite adhesive.

[0049] Furthermore, a non-metallic fiber insulation layer is provided between the heat storage unit 2 and the shell 3.

[0050] It should be noted that there is a gap between the heat storage unit 2 and the shell 3, and the non-metallic flexible insulation layer thereon can be made of materials such as graphite fiber or aluminum silicate fiber.

[0051] Furthermore, such as Figure 2 As shown, the upper end cap of the housing 3 includes an inlet area 301, an outlet area 302, and an instrument area.

[0052] Furthermore, the housing has interfaces for instruments such as pressure sensors or temperature sensors. The instrument port on the side of the housing is used to monitor the temperature and pressure inside the insulation layer, while the PCM status needs to be monitored at the top end cap.

[0053] Furthermore, the upper end cap of the housing 3 is provided with an interface for entering and exiting the HTF.

[0054] The upper end cap of the housing 3 is equipped with an interface for entering and exiting the HTF, and the angle can be adjusted according to the actual installation conditions.

[0055] Furthermore, such as Figure 1 As shown, the outer side of the housing 3 is provided with support legs 31.

[0056] In this application, the outer shell is provided with support legs, which can be used to connect with the field base or structural components to fix the heat storage heat exchanger body.

[0057] Example 2

[0058] Components that are the same as or corresponding to those in Embodiment 1 are referred to using the same reference numerals as in Embodiment 1. For simplicity, only the differences from Embodiment 1 are described below. The difference between Embodiment 2 and Embodiment 1 is as follows:

[0059] Furthermore, the heat storage unit 2, the graphite perforated plate 21, and the graphite tube unit 1 are all made of graphite material, and they all have a dense silicon carbide coating inside and out.

[0060] It should be noted that the heat storage unit 2, the graphite perforated plate 21, and the graphite tube unit 1 are all made of graphite, and they must be coated with a dense ceramic coating on their inner and outer surfaces to make the graphite a high-temperature resistant, corrosion-resistant, and impermeable material.

[0061] In addition, the graphite tube unit 1 and the heat storage unit 2 are coated with a dense silicon carbide coating, making their surfaces smooth and less prone to scaling, which facilitates disassembly and cleaning. Damaged individual heat storage units can be replaced accordingly, resulting in low maintenance costs.

[0062] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A U-tube high temperature corrosion resistant phase change heat accumulator exchanger, characterized in that, The graphite tube unit, the heat storage unit and the shell are arranged from inside to outside, and the graphite tube unit, the heat storage unit and the bottom of the shell are arranged in the vertical direction. The graphite tube unit is suspended in the interior of the heat storage unit. The heat storage unit is suspended in the interior of the shell.

2. The U-tube high temperature corrosion resistant phase change heat storage and heat exchanger according to claim 1, characterized in that, The graphite tube unit is arranged by several graphite tubes which are uniformly and spacedly arranged, and the graphite tube unit is suspended on the graphite hole plate of the heat storage unit through the connecting piece.

3. The U-tube high temperature corrosion resistant phase change heat accumulator heat exchanger according to claim 2, characterized in that, The graphite hole plate is provided with several installation grooves, and the graphite hole plate comprises an inflow area and an outflow area. Adjacent two inflow areas and outflow areas are provided with a feeding area.

4. The U-tube high temperature corrosion resistant phase change heat accumulator heat exchanger according to claim 2, characterized in that, The upper end suspension part of the graphite tube is in T-shaped structure, and the lower ends of two adjacent groups of graphite tubes are detachably connected through the connecting pipe, and the two groups of graphite tubes and the connecting pipe form a U-shaped pipe structure.

5. The U-tube high temperature corrosion resistant phase change heat accumulator heat exchanger according to claim 4, characterized in that, The connecting piece comprises a clamping key which is matched with the variable diameter part of the graphite tube.

6. The U-tube high temperature corrosion resistant phase change heat accumulator heat exchanger according to claim 1, characterized in that, A non-metallic fiber heat preservation layer is arranged between the heat storage unit and the shell.

7. The U-tube high temperature corrosion resistant phase change heat accumulator heat exchanger according to claim 1, characterized in that, The heat storage unit, the graphite hole plate and the graphite tube unit are all graphite materials, and the inside and outside of the graphite materials are provided with dense silicon carbide coating.

8. The U-tube high temperature corrosion resistant phase change heat accumulator heat exchanger according to claim 3, characterized in that, The upper head of the shell comprises an inlet area, an outlet area and an instrument area. HTF enters the inflow area from the inlet area, and then is output from the outflow area through the outlet area.

9. The U-tube high temperature corrosion resistant phase change heat accumulator heat exchanger according to claim 1, characterized in that, The upper head of the shell is provided with an HTF inlet and outlet interface.

10. The U-tube high temperature corrosion resistant phase change heat accumulator heat exchanger according to claim 1, characterized in that, The shell is provided with a supporting leg.

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