Solar fused salt heat exchange system

Abstract

The utility model discloses a solar fused salt heat exchange system which comprises a shell, a feeding port and a discharging port are formed in the shell, a fused salt pipe extending inwards is fixed to the feeding port, a circulating water pipe is arranged on the periphery of the fused salt pipe, a heat exchange cavity is formed between the fused salt pipe and the shell, the discharging port is formed in one end of the heat exchange cavity, and the circulating water pipe is arranged on the other end of the heat exchange cavity. And an open hole is formed in the side wall of the molten salt pipe and faces the heat exchange cavity on the side of the discharge port. Fused salt circularly flows along the feeding port, the fused salt pipe, the heat exchange cavity and the discharging port in sequence, so that heat of the fused salt is conducted to the circulating water pipe on the periphery of the fused salt pipe, and the open holes are formed in the side wall of the fused salt pipe, so that a small amount of the fused salt with the high temperature on the side of the feeding port can flow to the side of the discharging port through the open holes, and the heat exchange efficiency is improved. The temperature of the fused salt is reduced due to heat exchange, so that the fused salt cannot be condensed due to too low temperature, and the heat exchanger is prevented from being blocked due to condensation of the fused salt.

Description

Technical Field

[0001] This utility model relates to the field of solar heat exchange device technology, and in particular to a solar molten salt heat exchange system. Background Technology

[0002] Because molten salt has a large specific heat capacity and strong heat transfer and heat storage properties, the research and development of projects using molten salt as a heat transfer and heat storage medium has attracted increasing attention from various countries.

[0003] Existing solar molten salt heat exchange systems typically pump cold molten salt from a cold molten salt storage tank into a heat absorber, where it is heated by solar radiation and then flows back to a hot molten salt storage tank. The hot molten salt is then pumped out to a heat exchanger, where its heat is transferred to water pipes. This heats the water in the pipes, generating high-pressure superheated steam (which drives a steam turbine generator to produce electricity). The cold molten salt, after releasing its heat, is then returned to the cold molten salt storage tank, and the system is recycled in this way.

[0004] However, during the heat exchange process, the molten salt, whose temperature gradually decreases, may condense in a small amount inside the heat exchanger. As the heat exchanger is used for a long time, the condensed molten salt is prone to accumulate, which can cause blockage of the heat exchanger and affect the normal operation of the system. Utility Model Content

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and provide a solar molten salt heat exchange system.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A solar molten salt heat exchange system includes a shell with an inlet and an outlet for molten salt circulation. A molten salt pipe extending inward is fixed to the inlet, and a circulating water pipe is provided on the outer periphery of the molten salt pipe. A heat exchange chamber is provided between the molten salt pipe and the shell, and the outlet is located at one end of the heat exchange chamber. An opening is provided on the side wall of the molten salt pipe, and the opening is oriented towards the heat exchange chamber on the outlet side.

[0008] Preferably, the molten salt tube has an injection port that communicates with the heat exchange chamber. The molten salt tube has a flared end and a narrow end from the outside to the inside. The opening is made on the flared end, and the injection port is set on the narrow end. The heat exchange chamber has a narrow section corresponding to the flared end and a flared section corresponding to the narrow end. The flared end is connected to the feed port, and the discharge port is set on the narrow section.

[0009] Preferably, the housing is provided with a guide plate opposite to the injection port, and a slide rod is installed on the guide plate that penetrates the housing. A spring is sleeved on the outer periphery of the slide rod and located on the outside of the housing. One end of the spring is connected to the housing and the other end of the spring is connected to the slide rod.

[0010] Preferably, a mounting plate is threaded onto the housing, the slide rod is slidably connected to the mounting plate, and a handle is fixed to the outer side of the mounting plate.

[0011] Preferably, the outer end of the slide rod is fixed with a stop plate, one end of the first spring is connected to the mounting plate, and the other end of the first spring is connected to the stop plate.

[0012] Preferably, the mounting plate is provided with a ring covering the outer periphery of the slide rod, and the ring is provided with a diaphragm that abuts against the outer periphery of the slide rod.

[0013] Preferably, the outer contour of the mounting plate is larger than the outer contour of the guide plate.

[0014] Preferably, the molten salt tube is provided with a sliding plate and a guide plate corresponding to the opening position. The sliding plate is located on the heat exchange chamber side and is slidably disposed on the guide plate. A protruding plate extends from the sliding plate, and a second spring is connected to the protruding plate. The other end of the second spring is connected to the connecting plate of the molten salt tube.

[0015] Preferably, the guide plate has a groove arranged along the opening direction, and the slide plate is slidably engaged in the groove.

[0016] Preferably, the circulating water pipe is provided with an inlet end and an outlet end that penetrate the shell at both ends, with the inlet end and the outlet end located on the same side.

[0017] The beneficial effects of this utility model are:

[0018] 1. An inlet and an outlet are provided on the shell. The inlet is connected to a molten salt pipe, and the outlet is located at one end of the heat exchange chamber inside the shell. The molten salt circulates sequentially along the inlet, the molten salt pipe, the heat exchange chamber, and the outlet to transfer the heat of the molten salt to the circulating water pipe around the molten salt pipe. By opening a hole in the side wall of the molten salt pipe, a small amount of the molten salt with a higher temperature at the inlet can flow to the outlet side through the opening, and then mix with the molten salt with a lower temperature at the outlet side due to heat exchange. This prevents the molten salt from condensing due to low temperature, thus avoiding blockage of the heat exchanger due to molten salt condensation, making the heat exchanger more reliable and stable in use.

[0019] 2. The molten salt tube is equipped with a flared end, and the heat exchange chamber is equipped with a narrow section corresponding to the flared end. The outlet of the molten salt is located on the narrow section. Since the volume of the flared end is relatively large, the flow rate of the molten salt is relatively slow when it flows through the flared end. As a result, the molten salt at the flared end can more easily conduct some heat to the narrow section through the molten salt tube, so as to properly heat the molten salt being exchanged on the narrow section side, avoid its condensation, and ensure the reliability of the molten salt circulation and transportation in the heat exchanger. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of this utility model;

[0021] Figure 2 This is a cross-sectional view of the present invention;

[0022] Figure 3 for Figure 2 Enlarged view of point A in the middle;

[0023] Figure 4 for Figure 2 Enlarged view of point B in the middle;

[0024] Figure 5 This is a schematic diagram of the structure of the guide plate of this utility model.

[0025] In the diagram: Shell 1, Inlet 11, Outlet 12, Heat exchange chamber 13, Flared section 131, Narrow section 132, Circulating water pipe 14, Water inlet 141, Water outlet 142, Discharge pipe 15, Molten salt pipe 2, Flared end 21, Narrow end 22, Spray nozzle 23, Opening 24, Guide plate 3, Mounting plate 31, Slide rod 32, Support plate 321, Spring 1 33, Ring 34, Diaphragm 35, Handle 36, Slide plate 4, Protruding plate 41, Guide plate 42, Slide groove 421, Spring 2 43, Connecting plate 44. Detailed Implementation

[0026] The present invention will be further described below with reference to the accompanying drawings and specific embodiments:

[0027] In the description of this specification, the terms "upper", "lower", "left", "right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or unit referred to must have a specific orientation or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0028] like Figures 1-5 As shown, a solar molten salt heat exchange system includes a shell 1. The shell 1 has an inlet 11 and an outlet 12 for molten salt circulation. The inlet 11 and the outlet 12 are located on the same side of the shell 1. Molten salt with a higher liquid temperature is fed into the shell 1 through the inlet 11 and discharged from the shell 1 through the outlet 12 after heat exchange. The inlet 11 is located at the center of one side of the shell 1. There are multiple outlets 12 distributed around the outer periphery of the inlet 11. The outlets 12 are connected to outwardly extending discharge pipes 15.

[0029] A molten salt pipe 2 extending inward is fixed to the feed inlet 11. The molten salt pipe 2 is used to transport high-temperature molten salt from the feed inlet 11 side into the shell 1. A circulating water pipe 14 is provided on the outer periphery of the molten salt pipe 2. A heat exchange chamber 13 is provided between the molten salt pipe 2 and the shell 1. The circulating water pipe 14 is located in the heat exchange chamber 13. The discharge port 12 is located at one end of the heat exchange chamber 13. The molten salt circulates sequentially along the feed inlet 11, the molten salt pipe 2, the heat exchange chamber 13, and the discharge port 12. At the same time, the molten salt conducts heat to the circulating water pipe 14 in the heat exchange chamber 13, so that the heat of the high-temperature molten salt is conducted to the water in the circulating water pipe 14.

[0030] The molten salt tube 2 has multiple openings 24 on its sidewall, which are circumferentially distributed on the sidewall of the molten salt tube 2. The openings 24 connect the interior of the molten salt tube 2 to the heat exchange chamber 13. The openings 24 face the heat exchange chamber 13 on the outlet 12 side. By providing openings 24 on the molten salt tube 2, the molten salt with a higher temperature on the inlet 11 side can flow in a small amount into the heat exchange chamber 13 on the outlet 12 side through the openings 24, and then mix with the molten salt on the outlet 11 side whose temperature has dropped due to heat exchange. This prevents the molten salt from condensing due to low temperature, thereby avoiding blockage of the heat exchanger (i.e., in this embodiment) due to molten salt condensation, making the use of the heat exchanger more reliable and stable.

[0031] Furthermore, the molten salt tube 2 is provided with an injection port 23 that communicates with the heat exchange chamber 13. The molten salt tube 2 is provided with a flared end 21 and a narrow end 22 from the outside to the inside. The opening 24 is opened on the flared end 21. The flared end 21 is connected to the feed port 11. The injection port 23 is provided on the narrow end 22. The volume of the flared end 21 side is larger than the volume of the narrow end 22 side, so that the flow rate of the molten salt when flowing through the flared end 21 is relatively slow (compared to the flow rate of the molten salt when flowing through the narrow end 22).

[0032] Furthermore, the heat exchange chamber 13 is provided with a narrow section 132 corresponding to the flared end 21 and a flared section 131 corresponding to the narrow end 22. As a result, the molten salt at the flared end 21 can more easily conduct some heat to the narrow section 132 side through the molten salt pipe 2, so as to properly conduct and heat the molten salt being exchanged on the narrow section 132 side, avoid its condensation, and ensure the reliability of the molten salt circulation and transportation in the heat exchanger.

[0033] The circulating water pipe 14 has an inlet end 141 and an outlet end 142 that penetrate the shell 1 at both ends. The inlet end 141 delivers cold water to be heated into the circulating water pipe 14, and the outlet end 142 is used to output high-pressure superheated steam after heating. The inlet end 141 is located on the same side as the outlet 12, and the outlet 12 is located on the narrow section 132. The cold water entering from the inlet end 141 is first preheated by the molten salt with a lower temperature on the narrow section 132 side, and then gradually delivered to the flared section 131 side through the circulating water pipe 14, further heating the water in the circulating water pipe 14.

[0034] Because the volume of the flared section 131 is larger than that of the narrow section 132, the molten salt flow rate of the narrow section 132 is faster. This allows the molten salt, which has been cooled by heat conduction, to be quickly discharged through the outlet 12 and the discharge pipe 15, preventing the molten salt from condensing and accumulating in the heat exchanger. At the same time, the molten salt flow rate of the flared section 131 is slower than that of the narrow section 132, and the temperature of the molten salt is relatively high when it just enters the flared section 131 through the injection port 23. As a result, the slower-flowing and higher-temperature molten salt can better conduct heat to the circulating water pipe 14, making the heat exchange efficiency more efficient.

[0035] Meanwhile, the housing 1 is provided with a guide plate 3 opposite to the injection port 23. The guide plate 3 buffers and guides the molten salt that is ejected from the narrow end 22 and the injection port 23 at a relatively fast flow rate, so that the molten salt can be transported more smoothly into the heat exchange chamber 13.

[0036] Furthermore, a sliding rod 32 penetrating the housing 1 is installed on the guide plate 3. A spring 33 located on the outer side of the housing 1 is sleeved on the outer periphery of the sliding rod 32. One end of the spring 33 is connected to the housing 1, and the other end of the spring 33 is connected to the sliding rod 32. Specifically, a stop plate 321 is fixed to the outer end of the sliding rod 32. One end of the spring 33 is connected to the mounting plate 31, and the other end of the spring 33 is connected to the stop plate 321, so that the guide plate 3 can be flexibly connected through the cooperation of the spring 33 and the sliding rod 32.

[0037] A mounting plate 31 is threadedly installed on the housing 1. The mounting plate 31 is detachably installed on the housing 1. A handle 36 is fixed on the outer side of the mounting plate 31 to facilitate rotation and disassembly of the mounting plate 31. The sliding rod 32 is slidably connected to the mounting plate 31. The outer contour of the mounting plate 31 is larger than the outer contour of the guide plate 3. Therefore, when the mounting plate 31 is removed, the sliding rod 32 and the guide plate 3 installed on the mounting plate 31 can be removed simultaneously for maintenance and cleaning.

[0038] The mounting plate 31 is provided with a ring 34 covering the outer periphery of the slide rod 32. The ring 34 is located inside the housing 1. The ring 34 is provided with a diaphragm 35 that abuts against the outer periphery of the slide rod 32. When the guide plate 3 slides due to the impact of flowing molten salt, the slide rod 32 and the guide plate 3 move synchronously. At this time, the diaphragm 35 abuts against the outer periphery of the slide rod 32 to scrape off the molten salt adhering to the outer periphery of the slide rod 32, so that the buffering and guiding action of the guide plate 3 is more reliable and stable.

[0039] The molten salt tube 2 is provided with a sliding plate 4 and a guide plate 42 corresponding to the position of the opening 24. The sliding plate 4 is located on the side of the heat exchange chamber 13 and is slidably disposed on the guide plate 42. The sliding plate 4 is provided in a one-to-one correspondence with the opening 24. The guide plate 42 is provided with a sliding groove 421 arranged along the direction of the opening 24. The sliding plate 4 is slidably engaged in the sliding groove 421.

[0040] A protruding plate 41 extends from the slide plate 4, which extends outward and obstructs the flow of molten salt in the heat exchange chamber 13. A second spring 43 is connected to the protruding plate 41, and the other end of the second spring 43 is connected to the connecting plate 44 of the molten salt pipe 2. When the overall flow rate of the molten salt in the heat exchange chamber 13 is relatively fast, the protruding plate 41 is pushed by the flowing molten salt and moves against the tension of the second spring 43 to gradually close and reduce the size of the opening 24. That is, the molten salt with a high flow rate is not easily condensed and accumulated in the heat exchanger. Thus, the size of the opening 24 can be appropriately reduced so that more hot molten salt can act on the heat exchange of the circulating water pipe 14. In this way, the efficiency of heat exchange is further improved while ensuring that the molten salt does not condense in the heat exchanger.

[0041] 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, improvements, etc., 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 solar molten salt heat exchange system, comprising a shell (1), wherein the shell (1) is provided with an inlet (11) and an outlet (12) for molten salt circulation, characterized in that: A molten salt pipe (2) extending inward is fixed on the feed inlet (11). A circulating water pipe (14) is provided on the outer periphery of the molten salt pipe (2). A heat exchange chamber (13) is provided between the molten salt pipe (2) and the shell (1). The discharge port (12) is located at one end of the heat exchange chamber (13). An opening (24) is provided on the side wall of the molten salt pipe (2). The opening (24) is located facing the heat exchange chamber (13) on the side of the discharge port (12).

2. The solar molten salt heat exchange system as described in claim 1, characterized in that: The molten salt tube (2) is provided with a spray port (23) that communicates with the heat exchange chamber (13). The molten salt tube (2) is provided with a flared end (21) and a narrow end (22) from the outside to the inside. The opening (24) is opened on the flared end (21). The spray port (23) is provided on the narrow end (22). The heat exchange chamber (13) is provided with a narrow section (132) corresponding to the flared end (21) and a flared section (131) corresponding to the narrow end (22). The flared end (21) is connected to the feed port (11). The discharge port (12) is provided on the narrow section (132).

3. The solar molten salt heat exchange system as described in claim 2, characterized in that: The housing (1) is provided with a guide plate (3) opposite to the injection port (23). A slide rod (32) penetrating the housing (1) is installed on the guide plate (3). A spring (33) located outside the housing (1) is sleeved on the outer periphery of the slide rod (32). One end of the spring (33) is connected to the housing (1), and the other end of the spring (33) is connected to the slide rod (32).

4. A solar molten salt heat exchange system as described in claim 3, characterized in that: A mounting plate (31) is threaded onto the housing (1), and the slide rod (32) is slidably connected to the mounting plate (31). A handle (36) is fixed to the outside of the mounting plate (31).

5. A solar molten salt heat exchange system as described in claim 4, characterized in that: The outer end of the slide rod (32) is fixed with a stop plate (321), one end of the spring (33) is connected to the mounting plate (31), and the other end of the spring (33) is connected to the stop plate (321).

6. A solar molten salt heat exchange system as described in claim 4, characterized in that: The mounting plate (31) is provided with a ring (34) covering the outer periphery of the slide rod (32), and the ring (34) is provided with a diaphragm (35) abutting against the outer periphery of the slide rod (32).

7. A solar molten salt heat exchange system as described in claim 4, characterized in that: The outer contour of the mounting plate (31) is larger than the outer contour of the guide plate (3).

8. A solar molten salt heat exchange system as described in claim 1, characterized in that: The molten salt tube (2) is provided with a sliding plate (4) and a guide plate (42) corresponding to the position of the opening (24). The sliding plate (4) is located on the side of the heat exchange chamber (13) and is slidably disposed on the guide plate (42). A protruding plate (41) extends from the sliding plate (4). A second spring (43) is connected to the protruding plate (41). The other end of the second spring (43) is connected to the connecting plate (44) of the molten salt tube (2).

9. A solar molten salt heat exchange system as described in claim 8, characterized in that: The guide plate (42) is provided with a sliding groove (421) arranged along the direction of the opening (24), and the sliding plate (4) is slidably engaged in the sliding groove (421).

10. A solar molten salt heat exchange system as described in claim 1, characterized in that: The circulating water pipe (14) is provided with an inlet end (141) and an outlet end (142) that penetrate the shell (1) at both ends, and the inlet end (141) and the outlet (12) are located on the same side.

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