Fused salt rapid cooling system and method

Abstract

The invention discloses a molten salt rapid cooling system and method. A molten salt inlet of a cooler is communicated with a hot salt tank through a molten salt pump, and a molten salt outlet is communicated with a cold salt tank; a hot air outlet is formed in the lower end of the periphery of the cooler and communicated with a hot air inlet of the mixer and an air inlet of the heat exchanger; fins of the cooler are rotatably arranged on the peripheral face of the flow guide body, the fused salt coil pipe is arranged on the periphery of the flow guide body in a surrounding mode, and a fused salt inlet and a fused salt outlet are formed in the two ends of the fused salt coil pipe respectively. An ascending channel is formed between the fused salt coil pipe and the flow guide body, and a descending channel is formed between the fused salt coil pipe and the shell; the wind temperature instrument is arranged in the shell; hot air and cold air are mixed in the mixer and then enter the upstream channel through an air inlet of the cooler and the air blower; a water inlet of the heat exchanger is communicated with the water tank through the water pump, and a water outlet is communicated with the hot water storage device. The device is simple and compact in structure, high in heat transfer efficiency, good in heat exchange effect, high in molten salt cooling efficiency and beneficial to improving the production efficiency.

Description

Technical Field

[0001] The present invention relates to the field of molten salt cooling, and in particular to a molten salt rapid cooling system and method. Background Art

[0002] Molten salt refers to the molten liquid of salt. The molten salt usually refers to the molten body of inorganic salt. Most of the molten salts in solid state are ionic crystals, which will form ionic melts after melting at high temperature. The most common molten salts are composed of alkali metals or alkaline earth metals and halides, silicates, carbonates, nitrates and phosphates. Molten salt has many characteristics, such as high working temperature, high-temperature heat transfer of up to about 565°C, and will not react with the pipes and other materials in contact at high temperature and normal pressure, and will not harm the environment. It has the advantages of high specific heat, high heat transfer capacity, low viscosity, easy handling, low price and safety. When the molten salt storage tank is forced to be overhauled due to design defects or material compatibility problems, thousands of tons of high-temperature liquid molten salt urgently need to be cooled and properly disposed of and stored. Therefore, it is of great significance to solve the cooling and storage problems of high-temperature molten salt in the event of an accident. At present, the device used for traditional salt cooling adopts a plate air cooler, which is cooled by the intersection of the air natural circulation system and the molten salt natural circulation system. The adaptability problem under environmental conditions such as extreme temperature and high humidity will affect the cooling effect. The device has a complex structure and high cost. For the natural air circulation system, it will be disturbed by external factors such as air quality and wind speed, which will affect the stability of cooling.

[0003] In summary, the waste heat of molten salt is not fully utilized at present, which wastes resources, has a complex and heavy device structure, low heat transfer efficiency, poor system stability and high economic cost. Summary of the invention

[0004] In view of the deficiencies in the prior art, the present invention provides a molten salt rapid cooling system and method.

[0005] The specific technical solutions are as follows:

[0006] A molten salt rapid cooling system, comprising: a hot salt tank, a molten salt pump, a cooler, a cold salt tank, a mixer, a fan, a water tank, a water pump, a heat exchanger, and a hot water storage device; the hot salt tank is connected to the molten salt inlet of the cooler through the molten salt pump, the molten salt outlet of the cooler is connected to the cold salt tank, and valves are respectively provided at the molten salt inlet and the molten salt outlet;

[0007] The lower end of the outer periphery of the cooler is symmetrically provided with hot air outlets, and valves are provided at the hot air outlets; each hot air outlet is respectively connected with the hot air inlet of the mixer and the air inlet of the heat exchanger; the air outlet of the fan is connected with the cold air inlet of the mixer, and the mixer is used to mix cold air and hot air, and its warm air outlet is connected with the air inlet of the cooler; the water tank is connected with the water inlet of the heat exchanger through a water pump, and the water outlet of the heat exchanger is connected with the hot water storage device; the heat exchanger is provided with an air outlet;

[0008] The cooler comprises: an outer shell, an upper crossbeam, a lower crossbeam, a connecting column, a guide body, fins, a molten salt coil, a blower, and a wind temperature meter; the upper crossbeam and the lower crossbeam are respectively fixedly connected horizontally to the top and bottom ends inside the outer shell, and the two ends of the connecting column are respectively fixedly connected to the centers of the upper crossbeam and the lower crossbeam; the guide body is coaxially mounted on the connecting column and can rotate around the axis; a plurality of fins are circumferentially uniformly and rotatably arranged on the outer peripheral surface of the guide body; a fixed blower is coaxially arranged below the guide body, the inlet of the blower is connected to the air inlet of the cooler, and a ventilation slot is provided at the outlet, and a rotatable blade is arranged in the ventilation slot to control the ventilation volume;

[0009] The molten salt coil is arranged around the outer periphery of the flow guide body, one end of which passes through the outer shell as a molten salt inlet, and the other end passes through the outer shell as a molten salt outlet; an upward wind channel is formed between the molten salt coil and the flow guide body, and a downward wind channel is formed between the molten salt coil and the outer shell; the wind temperature meter is arranged in the outer shell to measure the air temperature.

[0010] Furthermore, the fins are rotatably arranged on the outer peripheral surface of the flow guide body, specifically: the fixed end of the rotating column is fixedly connected to the flow guide body, the rotating end is fixedly connected to the center of the side wall of the fin, and the rotation angle of the rotating end can be manually adjusted and fixed.

[0011] Furthermore, the rotation angle of the fin is adjusted within a range of 0-90°.

[0012] Furthermore, the shape of the fin is selected from any one of a rectangle, a triangle, and a fan.

[0013] Furthermore, there are multiple groups of fins, which are respectively arranged on the upper and lower outer peripheral surfaces of the three-section spindle of the guide body, and each group has multiple fins, which are evenly arranged along the circumferential direction.

[0014] Furthermore, the guide body is in a three-section spindle shape, the spindle section at the upper end has a larger radius, and the spindle section at the lower end has a smaller radius.

[0015] Furthermore, a through hole is coaxially opened in the center of the blower shell for the connecting column to pass through, and the shell is fixedly mounted on the connecting column; there are multiple ventilation grooves extending radially from the axis to the periphery, and the extension length is less than the radius of the shell.

[0016] Furthermore, it also includes a control system, the wind temperature meter is also arranged inside the mixer, and the control system controls the opening of the valve at the hot air outlet and the fan power according to the data fed back by the wind temperature meter.

[0017] A molten salt rapid cooling method is implemented based on the molten salt rapid cooling system. The high-temperature molten salt is pumped out from a hot salt tank under the action of a molten salt pump and flows into a molten salt coil through a molten salt inlet; a fan sends cold air into a mixer, and the mixed air enters the air inlet of the cooler from the warm air outlet, passes through the ventilation slots into an upward channel, flows upward along the guide body and fins, enters a downward channel after reaching the top, and flows downward along the inner wall of the shell. During the upward and downward flow, the air contacts and exchanges heat with the molten salt coil, and the temperature gradually increases, and finally flows out from the hot air outlet; the high-temperature molten salt in the molten salt coil is taken away with heat, and after flowing out from the molten salt outlet, it is transported to a cold salt tank for storage for subsequent industrial processing;

[0018] The hot air flowing out from the hot air outlet is divided into two paths. One path is input into the mixer to mix with the cold air to obtain warm air, and then enters the air inlet of the cooler from the warm air outlet to participate in the molten salt heat exchange, and the cycle repeats; the other path is input into the heat exchanger to participate in the water heat exchange;

[0019] The specific process of water heat exchange is as follows: cold water is pumped out of the water tank by a water pump and flows into the heat exchanger through the water inlet; hot air is input into the heat exchanger through the air inlet, exchanges heat with the cold water, and is discharged into the air from the air outlet after the temperature drops; the temperature of the cold water increases after the heat exchange, and is then transported to the hot water storage device for storage after flowing out from the water outlet of the heat exchanger for use by users and / or factories.

[0020] Furthermore, the flow rate of the molten salt flowing in the molten salt coil is in the range of 0.5-1.5 kg / s, and the wind speed of the cold air output by the fan is in the range of 4-16 m / s.

[0021] The beneficial effects of the present invention are:

[0022] (1) The molten salt rapid cooling system of the present invention has a simple and compact structure, high heat transfer efficiency, good heat exchange effect, and high molten salt cooling efficiency, which helps to improve production efficiency.

[0023] (2) The present invention controls the high-temperature molten salt to be stably cooled to a desired temperature range by controlling the air flow and temperature entering the cooler, that is, avoiding solidification of the molten salt due to excessive cooling, and always keeping it in a molten state, which is beneficial to saving the heat required for the solidification and remelting of the molten salt; at the same time, it is beneficial to save energy and store and utilize the heat released during cooling.

[0024] (3) The system of the present invention can adjust the fan power and the angle of the rotatable blades according to the changes in the external ambient temperature, so that the high-temperature molten salt can be stably cooled to the required temperature range. At the same time, it reduces the fan power consumption when using a constant fan power and also reduces the total heat dissipation loss of the system, which is beneficial to the economy of the system and reduces production costs.

[0025] (4) When the molten salt storage tank equipment is under maintenance or sudden failure, the system of the present invention can conveniently discharge all the molten salt in the hot salt tank and quickly cool it down. The process is simple and easy, and the molten salt is easy to recover, which reduces the complex and arduous work of conventional molten salt discharge and recovery.

[0026] (5) The method of the present invention utilizes waste heat for heat exchange, realizes energy cascade utilization, avoids direct heat exchange between high-temperature molten salt and cooling medium, quickly removes the heat of molten salt through the fluidity of wind, reduces the heat accumulation of molten salt, and makes the heat transfer of molten salt uniform. The fin angle and type are automatically adjusted according to the required molten salt temperature to make the wind more popular and transferable, which is beneficial to the stability of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the structure of the molten salt rapid cooling system in an embodiment of the present invention.

[0028] Figure 2 Schematic diagram of the structure of the cooler in the embodiment of the present invention.

[0029] Figure 3 Schematic diagram of the structure of the lava coil and the guide body in the cooler in the embodiment of the present invention.

[0030] Figure 4 Schematic diagram of the structure of the flow guide body in the cooler according to the embodiment of the present invention.

[0031] Figure 5 It is a schematic diagram of the installation of the rectangular replaceable fins and the flow guide body in the embodiment of the present invention.

[0032] Figure 6 Schematic diagram of the structure of the blower in the embodiment of the present invention.

[0033] Figure 7 It is a schematic diagram of the installation of the triangular replaceable fins and the flow guide body in an embodiment of the present invention.

[0034] Figure 8 It is a schematic diagram of the installation of the fan-shaped replaceable fins and the flow guide body in an embodiment of the present invention.

[0035] Fig. 9 It is a schematic diagram of the change of the output molten salt temperature in Example 1 of the present invention as the high-temperature molten salt is introduced for a certain time and cooled to a specified temperature at different positions of the molten salt coil.

[0036] Fig.10 It is a schematic diagram of the change of the output molten salt temperature in Example 2 of the present invention as the high-temperature molten salt is introduced for a certain time and cooled to a specified temperature at different positions of the molten salt coil.

[0037] Fig.11 It is a schematic diagram of the change of the output molten salt temperature in Example 3 of the present invention as the high-temperature molten salt is introduced for a certain time and cooled to a specified temperature at different positions of the molten salt coil.

[0038] In the figure, hot salt tank 1, cooler 2, second valve 3, cold salt tank 4, molten salt pump 5, first valve 6, third valve 7, second branch 8, first branch 9, mixer 10, fifth valve 11, fourth branch 12, third branch 13, fourth valve 14, water tank 15, water pump 16, heat exchanger 17, hot water storage device 18, fan 19, control system 20;

[0039] Shell 201, upper crossbeam 202, connecting column 203, molten salt outlet 204, wind temperature meter 205, molten salt coil 206, flow guide 207, rectangular replaceable fins 208; blower 209, ventilation slots 2091, rotatable blades 2092; hot air second outlet 210, lower crossbeam 211, molten salt inlet 212, hot air first outlet 213, rotating column 214, triangular replaceable fins 215, fan-shaped replaceable fins 216. DETAILED DESCRIPTION

[0040] The present invention will be described in detail below according to the accompanying drawings and preferred embodiments, and the purpose and effect of the present invention will become more clear. The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0041] like Figure 1 As shown, a molten salt rapid cooling system includes: a molten salt cooling module, a cold and hot air mixing module, and a heat exchange module.

[0042] The molten salt cooling module includes: a hot salt tank 1, a molten salt pump 5, a cooler 2, and a cold salt tank 4. The outlet of the hot salt tank 1 is connected to the inlet of the molten salt pump 5 through a pipeline, and the outlet of the molten salt pump 5 is connected to the molten salt inlet 212 of the cooler 2 through a pipeline, and a first valve 6 is set on the pipeline to control the flow. The molten salt outlet 204 of the cooler 2 is connected to the inlet of the cold salt tank 4 through a pipeline, and a second valve 3 is set on the pipeline to control the flow.

[0043] like Figure 2 , Figure 3As shown, the cooler 2 includes: a shell 201, an upper crossbeam 202, a connecting column 203, a wind temperature meter 205, a molten salt coil 206, a flow guide 207, a rectangular replaceable fin 208, a blower 209, and a lower crossbeam 211. The upper crossbeam 202 is horizontally fixed to the top of the inner cavity of the shell 201, the lower crossbeam 211 is horizontally fixed to the bottom of the inner cavity of the shell 201, and the connecting column 203 is vertically fixed between the upper crossbeam 202 and the lower crossbeam 211, and the upper end is fixed to the center of the upper crossbeam 202, and the lower end is fixed to the center of the lower crossbeam 211. The guide body 207 is installed on the connecting column 203 and can rotate with the connecting column 203 as the axis; the guide body 207 is in a three-section spindle shape, the spindle section at the upper end has a large radius, and the spindle section at the lower end has a small radius. This structural setting can better achieve flow diversion, making the wind direction more rapid and the wind speed larger, which is conducive to heat exchange between air and molten salt salt tube 206. The molten salt coil 206 is arranged around the outer periphery of the guide body 207, one end of which passes through the outer shell 201 as the molten salt inlet 212, and the other end passes through the outer shell 201 as the molten salt outlet 204; an upward channel is formed between the molten salt coil 206 and the guide body 207, and a downward channel is formed between the molten salt coil 206 and the outer shell 201. Two through holes are symmetrically opened at the lower end of the outer periphery of the outer shell 201, which are respectively connected to the pipelines and serve as the first hot air outlet 213 and the second hot air outlet 210. The wind temperature meters 208 are installed at intervals along the axial direction of the flow guide 207 on the inner wall of the housing 201 , as well as at the first hot air outlet 213 and the second hot air outlet 210 , for measuring the air temperature at different positions.

[0044] like Figure 4 , Figure 5 As shown, there are multiple groups of rectangular replaceable fins 208, which are arranged on the upper and lower outer peripheral surfaces of the three spindles of the guide body 207, and each group has multiple fins, which are evenly arranged along the circumference. Specifically, the rectangular replaceable fins 208 are rotatably mounted on the guide body 207, and the fixed end of the rotating column 214 is fixedly connected to the guide body 207, and the rotating end is fixedly connected to the center of the side wall of the rectangular replaceable fin 208, and the rotation angle of the rotating end is adjustable and can be fixed, so as to realize the artificial adjustment of the angle of the rectangular replaceable fin 208. The rectangular replaceable fin 208 is used for guiding and rotating the wind. After the wind contacts the surface of the replaceable fin 208, it will flow along the tangent direction of the rectangular replaceable fin 208, changing the original straight flow path of the wind, so as to realize the guiding effect. Since the rectangular replaceable fin 208 is a rotatable structure, the angle of the rectangular replaceable fin 208 can be adjusted according to actual needs, thereby dynamically changing the direction of wind flow to adapt to different cooling requirements and wind direction changes. The adjustable angle range is 0-90°.

[0045] like Figure 6 , Figure 7As shown, the rectangular replaceable fin 208 can be replaced with different types of fins such as triangular replaceable fins 215 or fan-shaped replaceable fins 216. The rectangular replaceable fin 208 has a relatively large heat transfer area and is suitable for occasions requiring a larger heat transfer area. It has a simple structure and relatively high strength and stability; but due to the relatively smooth flow of the fluid, the heat transfer efficiency may be relatively low. The triangular replaceable fin 215 can improve the heat transfer efficiency by destroying the boundary layer; but due to the increase in resistance, more energy may be required to drive the fluid flow, and due to the sharp edges, stress concentration is easily generated when subjected to external forces, and the strength and stability may be relatively low. The fan-shaped replaceable fin 216 has good fluid flow characteristics, which helps to improve the heat transfer efficiency. At the same time, the fan-shaped shape can also increase the heat transfer area and improve the heat transfer performance; the arc-shaped edge can disperse stress and improve strength and stability. In summary, if you need to increase the heat dissipation area and improve the cooling effect, you can use the rectangular replaceable fins 208; if you need to promote the mixing and heat transfer of warm air and need to run for a long time, you can use the triangular replaceable fins 215; if you need better heat transfer performance and stable air volume, you can use the fan-shaped replaceable fins 216. The specific selection is based on actual needs.

[0046] A blower 209 is coaxially arranged below the flow guide 207. Figure 8 As shown, the blower 209 includes a shell, ventilation slots 2091 and rotatable blades 2092. The shell is a cylinder, and a through hole is coaxially opened in the center thereof for the connection column 203 to pass through, and the shell is fixedly mounted on the connection column 203; a through hole is opened at the bottom of the shell for air intake, and the hole is the air inlet of the cooler 2. A plurality of ventilation slots 2091 are evenly opened in the circumferential direction at the center of the upper surface of the shell to communicate with the air inlet, and each ventilation slot 2091 extends radially from the axis to the outer periphery for a certain length, and the extension length is less than the radius of the shell. A rotatable blade 2092 is arranged in each ventilation slot 2091, and the blade angle can be manually adjusted according to the change of the external ambient temperature, thereby changing its position in the rotating slot 2091 to control the air intake flow. Specifically, when the outside temperature decreases, the air flow entering the cooler 2 needs to be reduced, and the rotatable blades 2092 need to be adjusted accordingly so that the angle between them and the ventilation slots 2091 becomes smaller; when the outside temperature increases, the air flow entering the cooler 2 needs to be increased, and the rotatable blades 2092 need to be adjusted accordingly so that the angle between them and the ventilation slots 2091 becomes larger.

[0047] The hot and cold air mixing module includes a mixer 10 and a fan 19. The main pipeline of the first branch pipe is connected to the first hot air outlet 213 of the cooler 2, and a third valve 7 is arranged on the main pipeline for adjusting the flow rate; the first branch 9 is connected to the first hot air inlet of the mixer 10, and the second branch 8 is connected to the air inlet 1 of the heat exchanger 17 of the heat exchange module. The main pipeline of the second branch pipe is connected to the second hot air outlet 210 of the cooler 2, and a fourth valve 14 is arranged on the main pipeline for adjusting the flow rate; the fourth branch 12 is connected to the second hot air inlet of the mixer 10, and the third branch 13 is connected to the air inlet 2 of the heat exchanger 17. The air outlet of the fan 19 is connected to the cold air inlet of the mixer 10 through a pipeline; a warm air outlet is opened above the mixer 10, and the warm air outlet is connected to the air inlet of the blower 209 through a pipeline, and a fifth valve 11 is arranged on the pipeline for adjusting the flow rate. The cold air output by the fan 19 and the hot air output by the cooler 2 are mixed in the mixer 10 and then output to the blower 209 through the warm air outlet of the mixer 10. The cold and hot air mixing module is an equipment component for adjusting the air temperature, which has the advantages of precise temperature regulation, energy saving and high efficiency, and strong adaptability. The module achieves the required temperature output by mixing the cold air and the hot air in a certain proportion. The module is also equipped with a wind temperature meter 205 and a control system 20 to accurately monitor and adjust the mixing ratio to ensure that the output air temperature is stable within the set value range; the wind temperature meter 205 is arranged inside the mixer 10, and the control system 20 controls the opening of the third valve 7, the fourth valve 14, and the power of the fan 19 according to the data fed back by the wind temperature meter 205. Specifically, when the outside temperature decreases, the air flow rate entering the cooler 2 needs to be reduced, and the power of the fan 19 needs to be adjusted down accordingly; when the outside temperature increases, the air flow rate entering the cooler 2 needs to be increased, and the power of the fan 19 needs to be adjusted up accordingly; this design reduces the fan power consumption when using a constant fan power and reduces the total heat dissipation loss of the system.

[0048] The heat exchange module includes: a water tank 15, a water pump 16, a heat exchanger 17, and a hot water storage device 18. The outlet of the water tank 15 is connected to the inlet of the water pump 16 through a pipeline, and the outlet of the water pump 16 is connected to the water inlet of the heat exchanger 17 through a pipeline; the water outlet of the heat exchanger 17 is connected to the hot water storage device 18 for supplying users and / or factories. The two air inlets of the heat exchanger 17 are respectively connected to the two hot air outlets of the cooler 2; the hot air after the heat exchange is completed is output from the air outlet of the heat exchanger 17. The setting of the heat exchange module reduces the energy waste of hot air and improves resource utilization.

[0049] Based on the above molten salt rapid cooling system, a molten salt rapid cooling method is proposed, which is specifically described through the following embodiments.

[0050] Example 1

[0051] A molten salt rapid cooling method, as follows:

[0052] The temperature of the high-temperature molten salt in the hot salt tank 1 is 580°C. The high-temperature molten salt flows out from the outlet of the hot salt tank 1, passes through the molten salt pump 5 along the pipeline, and flows into the molten salt coil 206 from the molten salt inlet 212 of the cooler 2 to participate in heat exchange. The flow rate of the high-temperature molten salt is controlled to be 1.5 kg / s by the molten salt pump 5 and the first valve 6. The length of the molten salt coil 206 is 310m. The low-temperature molten salt after heat exchange flows out from the molten salt outlet 204 of the cooler 2 at a temperature of 200°C, and enters the cold salt tank 4 along the pipeline for storage for subsequent industrial processing.

[0053] The fan 19 sends cold air into the mixer 10 along the pipeline, the cold air temperature is 30°C, the wind speed is 4m / s, and the warm air after the cold air and the hot air are mixed flows out from the warm air outlet of the mixer 10, and the warm air temperature is 110°C. The warm air enters the cooler 2 through the fifth valve 11 along the pipeline for heat exchange. Specifically, the warm air passes through the air inlet of the blower 209, passes through the ventilation slot 2091 and enters the upward channel. The warm air exchanges initial heat with the molten salt coil 206 while flowing upward along the guide body 207; after the wind reaches the top of the shell 201, it enters the downward channel through the gap between the molten salt coil 206 and the shell 201, and exchanges secondary heat with the molten salt coil 206 while descending along the inner wall of the shell 201, and finally flows out from the two hot air outlets. During the ascending and descending process, the warm air contacts the molten salt coil 206 for heat exchange, and the temperature gradually increases. The temperature of the hot air flowing out of the two hot air outlets (i.e., the first hot air outlet 213 and the second hot air outlet 210) is 180°C and the wind speed is 8m / s, indicating that the guide body 207 and the replaceable fins 208 in the molten salt rapid cooling system have played a role, changing the wind direction and increasing the wind speed. The hot air flowing out of the hot air outlet is divided into two paths, one of which is input into the mixer 10 to mix with the cold air to obtain warm air, and then sent to the cooler 2 to participate in the molten salt heat exchange, and the cycle is repeated; the other path is input into the heat exchanger 17 to participate in the water heat exchange.

[0054] Cold water flows out from the outlet of the water tank 15, the cold water temperature is 25°C, and flows into the heat exchanger 17 from the water inlet of the heat exchanger 17 along the pipeline through the water pump 16 for heat exchange. The water temperature after heat exchange increases, and the hot water temperature is 60°C. The hot water flows out from the water outlet of the heat exchanger 17 and flows into the hot water storage device 18 along the pipeline for use by users and factories; the wind after heat exchange is discharged into the atmosphere from the air outlet of the heat exchanger 17 through the pipeline.

[0055] like Fig. 9As shown, under the parameters of this embodiment, that is, the high-temperature molten salt temperature is 580°C, the molten salt flow rate is 1.5kg / s, and the warm air temperature at the lower air inlet is 110°C, as the time for the high-temperature molten salt to pass into the molten salt coil 206 increases, the position of the molten salt in the molten salt coil 206 when it is cooled to the specified temperature is recorded. As can be seen from the figure, when the high-temperature molten salt is passed into the molten salt coil 206 for 13s, the molten salt temperature drops to 200°C at 100m away from the molten salt inlet 212; at 27s, the molten salt temperature drops to 200°C at 160m; at 40s, the molten salt temperature drops to 200°C at 220m; at 53s, the molten salt temperature drops to 200°C at 300m. It proves that the present invention can achieve rapid cooling of molten salt in a short time.

[0056] Example 2

[0057] The temperature of the high-temperature molten salt is set to 580°C, the molten salt flow rate is 1.0kg / s, the length of the molten salt coil 206 is 310m, and the temperature of the low-temperature molten salt is 195°C. The cold air temperature output by the fan 19 is 30°C, the wind speed is 6m / s, the warm air temperature output after mixing with the hot air in the mixer 10 is 120°C, the hot air temperature at the two hot air outlets of the cooler 2 is 200°C, and the wind speed is 12m / s. The temperature of the cold water flowing into the heat exchanger 17 is 25°C, and the temperature of the hot water output is 70°C. The process flow is the same as that of Example 1.

[0058] like Fig.10 As shown, under the parameters of this embodiment, as the time for high-temperature molten salt to be passed into the molten salt coil 206 increases, the position of the molten salt in the molten salt coil 206 when it is cooled to a specified temperature is recorded. As can be seen from the figure, when the high-temperature molten salt is passed into the molten salt coil 206 for 20 seconds, the molten salt temperature drops to 200°C at 100m away from the molten salt inlet 212; at 40s, the molten salt temperature drops to 200°C at 160m; at 60s, the molten salt temperature drops to 200°C at 230m; at 80s, the molten salt temperature drops to 200°C at 260m. It is proved that the present invention can achieve rapid cooling of molten salt in a short time, and the cooling effect is better than that of Example 1.

[0059] Example 3

[0060] The temperature of the high-temperature molten salt is set to 580°C, the molten salt flow rate is 0.5kg / s, the length of the molten salt coil 206 is 310m, and the temperature of the low-temperature molten salt is 190°C. The cold air temperature output by the fan 19 is 30°C, the wind speed is 8m / s, the warm air temperature output after mixing with the hot air in the mixer 10 is 110°C, the hot air temperature at the two hot air outlets of the cooler 2 is 220°C, and the wind speed is 16m / s. The cold water temperature flowing into the heat exchanger 17 is 25°C, and the hot water temperature output is 80°C. The process flow is the same as that of Example 1.

[0061] like Fig.11 As shown, under the parameters of this embodiment, as the time for high-temperature molten salt to be passed into the molten salt coil 206 increases, the position of the molten salt in the molten salt coil 206 when it is cooled to a specified temperature is recorded. As can be seen from the figure, when the high-temperature molten salt is passed into the molten salt coil 206 for 40 seconds, the molten salt temperature drops to 200°C at 90m away from the molten salt inlet 212; at 80 seconds, the molten salt temperature drops to 200°C at 150m; at 120 seconds, the molten salt temperature drops to 200°C at 200m; at 160 seconds, the molten salt temperature drops to 200°C at 2500m. It is proved that the present invention can achieve rapid cooling of molten salt in a short time, and the cooling effect is better than that of Example 1 and Example 2.

[0062] Those skilled in the art can understand that the above are only preferred examples of the invention and are not intended to limit the invention. Although the invention is described in detail with reference to the above examples, those skilled in the art can still modify the technical solutions recorded in the above examples or replace some of the technical features therein with equivalents. Any modification, equivalent replacement, etc. made within the spirit and principle of the invention shall be included in the protection scope of the invention.

Claims

1. A molten salt rapid cooling system, characterized in that: include: A hot salt tank, a molten salt pump, a cooler, a cold salt tank, a mixer, a fan, a water tank, a water pump, a heat exchanger, and a hot water storage device; the hot salt tank is connected to the molten salt inlet of the cooler through the molten salt pump, and the molten salt outlet of the cooler is connected to the cold salt tank, and valves are respectively provided at the molten salt inlet and the molten salt outlet; The lower end of the outer periphery of the cooler is symmetrically provided with hot air outlets, and valves are provided at the hot air outlets; each hot air outlet is respectively connected with the hot air inlet of the mixer and the air inlet of the heat exchanger; the air outlet of the fan is connected with the cold air inlet of the mixer, and the mixer is used to mix cold air and hot air, and its warm air outlet is connected with the air inlet of the cooler; the water tank is connected with the water inlet of the heat exchanger through a water pump, and the water outlet of the heat exchanger is connected with the hot water storage device; the heat exchanger is provided with an air outlet; The cooler comprises: an outer shell, an upper crossbeam, a lower crossbeam, a connecting column, a guide body, fins, a molten salt coil, a blower, and a wind temperature meter; the upper crossbeam and the lower crossbeam are respectively fixedly connected horizontally to the top and bottom ends inside the outer shell, and the two ends of the connecting column are respectively fixedly connected to the centers of the upper crossbeam and the lower crossbeam; the guide body is coaxially mounted on the connecting column and can rotate around the axis; a plurality of fins are circumferentially uniformly and rotatably arranged on the outer peripheral surface of the guide body; a fixed blower is coaxially arranged below the guide body, the inlet of the blower is connected to the air inlet of the cooler, and a ventilation slot is provided at the outlet, and a rotatable blade is arranged in the ventilation slot to control the ventilation volume; The molten salt coil is arranged around the outer periphery of the flow guide body, one end of which passes through the outer shell as a molten salt inlet, and the other end passes through the outer shell as a molten salt outlet; an upward wind channel is formed between the molten salt coil and the flow guide body, and a downward wind channel is formed between the molten salt coil and the outer shell; the wind temperature meter is arranged in the outer shell to measure the air temperature.

2. The molten salt rapid cooling system according to claim 1, characterized in that: The fins are rotatably arranged on the outer peripheral surface of the guide body, specifically: the fixed end of the rotating column is fixedly connected to the guide body, the rotating end is fixedly connected to the side wall center of the fin, and the rotating angle of the rotating end can be manually adjusted and fixed.

3. The molten salt rapid cooling system according to claim 2, characterized in that: The rotation angle of the fin is adjusted in the range of 0-90°.

4. The molten salt rapid cooling system according to claim 1, characterized in that: The shape of the fin is selected from any one of a rectangle, a triangle and a fan.

5. The molten salt rapid cooling system according to claim 1, characterized in that: There are multiple groups of fins, which are respectively arranged on the upper and lower outer peripheral surfaces of the three-section spindle body of the guide body, and each group has multiple fins, which are evenly arranged along the circumferential direction.

6. The molten salt rapid cooling system according to claim 1, characterized in that: The guide body is in a three-section spindle shape, the spindle section at the upper end has a large radius, and the spindle section at the lower end has a small radius.

7. The molten salt rapid cooling system according to claim 1, characterized in that: The center of the shell of the blower is coaxially provided with a through hole for the connecting column to pass through, and the shell is fixedly mounted on the connecting column; there are multiple ventilation slots extending radially from the axis to the periphery, and the extension length is less than the radius of the shell.

8. The molten salt rapid cooling system according to claim 1, characterized in that: It also includes a control system. The wind temperature meter is also arranged inside the mixer. The control system controls the opening of the valve at the hot air outlet and the fan power according to the data fed back by the wind temperature meter.

9. A molten salt rapid cooling method, implemented based on the molten salt rapid cooling system according to any one of claims 1 to 8, characterized in that: The high-temperature molten salt is pumped out from the hot salt tank by the molten salt pump and flows into the molten salt coil through the molten salt inlet; the fan sends cold air into the mixer, and the mixed air enters the air inlet of the cooler from the warm air outlet, passes through the ventilation slot into the upward channel, flows upward along the guide body and fins, and enters the downward channel after reaching the top, and flows downward along the inner wall of the shell. During the upward and downward flow, the air contacts and exchanges heat with the molten salt coil, and the temperature gradually increases, and finally flows out from the hot air outlet; the high-temperature molten salt in the molten salt coil is taken away with heat, and after flowing out from the molten salt outlet, it is transported to the cold salt tank for storage for subsequent industrial processing; The hot air flowing out from the hot air outlet is divided into two paths. One path is input into the mixer to mix with the cold air to obtain warm air, and then enters the air inlet of the cooler from the warm air outlet to participate in the molten salt heat exchange, and the cycle repeats; the other path is input into the heat exchanger to participate in the water heat exchange; The specific process of water heat exchange is as follows: cold water is pumped out of the water tank by a water pump and flows into the heat exchanger through the water inlet; hot air is input into the heat exchanger through the air inlet, exchanges heat with the cold water, and is discharged into the air from the air outlet after the temperature drops; the temperature of the cold water increases after the heat exchange, and is then transported to the hot water storage device for storage after flowing out from the water outlet of the heat exchanger for use by users and / or factories.

10. The method for rapid cooling of molten salt according to claim 9, characterized in that: The flow rate of the molten salt flowing in the molten salt coil is in the range of 0.5-1.5 kg / s, and the wind speed of the cold air output by the fan is in the range of 4-16 m / s.

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