Fused salt heater system for reducing flow resistance

Abstract

This utility model discloses a molten salt heating furnace system for reducing flow resistance, including a molten salt furnace, a molten salt heat exchanger, a mixing tank, a feed pump, a circulating pump, an outlet pipeline, and a return pipeline. The inlet of the feed pump is used to receive molten salt, and the outlet of the feed pump is connected to the feed port at the upper end of the molten salt heat exchanger. The outlet at the lower end of the molten salt heat exchanger is connected to the mixing tank. The inlet of the circulating pump is connected to the mixing tank, and the outlet of the circulating pump is connected to the medium inlet of the molten salt furnace. The medium outlet of the molten salt furnace is connected to both the outlet pipeline and the return pipeline. The return pipeline is connected to the mixing tank. The flue gas outlet of the molten salt furnace is connected to the air inlet of the molten salt heat exchanger, which also has an outlet. This utility model can reduce the flow resistance of molten salt, reduce the head required by the circulating pump, thereby reducing the power consumption of the circulating pump, reducing electricity costs, and improving economic efficiency.

Description

Technical Field

[0001] This utility model relates to a molten salt heating furnace system for reducing flow resistance. Background Technology

[0002] Currently, a molten salt furnace is a heating device that uses molten salt as a heat transfer medium. The molten salt furnace has heat exchanger tubes that allow molten salt to flow. The heat exchanger tubes generally include inner coils and outer coils. The high-temperature flue gas generated by combustion in the molten salt furnace exchanges heat with the molten salt in the heat exchanger tubes to heat the molten salt. For example, Chinese patent CN222634790U discloses a high-temperature binary molten salt furnace that uses blast furnace gas.

[0003] Molten salt energy storage technology is a mature, stable, and low-cost energy storage technology that uses molten salt as a medium for storing and releasing thermal energy. It requires a molten salt furnace with a large temperature difference. The mainstream design temperature of this furnace is a return temperature of 290℃ and a supply temperature of 565℃. Molten salt at 290℃ flows into the furnace through the medium inlet, is heated to 565℃, and then flows out through the medium outlet, resulting in a temperature difference of 275℃ between the inlet and outlet. To achieve such a large temperature difference, the heat exchanger tubes in the furnace need to be designed to be sufficiently long to allow for sufficient heat exchange time and area for the molten salt. However, longer tubes mean a longer flow path for the molten salt, leading to greater flow resistance. This necessitates the use of a higher-head circulating pump, significantly increasing power consumption and electricity costs, thus reducing economic efficiency. Utility Model Content

[0004] The technical problem to be solved by this utility model is to overcome the defects of the prior art and provide a molten salt heating furnace system for reducing flow resistance. It can reduce the flow resistance of molten salt flow, reduce the head required by the circulating pump, thereby reducing the power consumption of the circulating pump, reducing electricity costs, and improving economy.

[0005] To solve the above-mentioned technical problems, the technical solution of this utility model is: a molten salt heating furnace system for reducing flow resistance, including a molten salt furnace, a molten salt heat exchanger, a mixing tank, a feed pump, a circulation pump, an outlet pipeline, and a return pipeline;

[0006] The inlet of the feed pump is used to receive molten salt, the outlet of the feed pump is connected to the feed port at the upper end of the molten salt heat exchanger, and the outlet at the lower end of the molten salt heat exchanger is connected to the mixing tank.

[0007] The inlet of the circulating pump is connected to the mixing tank, the outlet of the circulating pump is connected to the medium inlet of the molten salt furnace, the medium outlet of the molten salt furnace is connected to the outlet pipeline and the return pipeline respectively, and the return pipeline is connected to the mixing tank.

[0008] The flue gas outlet of the molten salt furnace is connected to the air inlet of the molten salt heat exchanger, and the molten salt heat exchanger also has an outlet for discharging the flue gas introduced from the air inlet.

[0009] Furthermore, a burner is installed in the molten salt furnace.

[0010] Furthermore, the molten salt heating furnace system for reducing flow resistance also includes an air preheater, a fuel heater, a blower, and an induced draft fan;

[0011] The outlet of the blower is connected to the air inlet of the air preheater, and the air outlet of the air preheater is connected to the burner;

[0012] The gas inlet of the fuel heater is used to receive fuel gas, and the gas outlet of the fuel heater is connected to the burner;

[0013] The outlet of the molten salt heat exchanger is connected to the flue gas inlet of the air preheater, the flue gas outlet of the air preheater is connected to the flue gas inlet of the fuel heater, and the flue gas outlet of the fuel heater is connected to the inlet of the induced draft fan.

[0014] Furthermore, the outlet of the induced draft fan is connected to the chimney.

[0015] Furthermore, the fuel heater is a gas-to-gas heat exchanger.

[0016] Furthermore, the molten salt heating furnace system for reducing flow resistance also includes a regulating branch and a first regulating valve. One end of the regulating branch is connected to the outlet of the molten salt heat exchanger, and the other end of the regulating branch is connected to the flue gas inlet of the fuel heater. The first regulating valve is connected in the regulating branch.

[0017] Furthermore, an electric stirrer is installed on the mixing tank.

[0018] Furthermore, a second regulating valve is connected to the outlet pipeline, and a third regulating valve is connected to the return pipeline.

[0019] Furthermore, two circulating pumps are connected in parallel, and the circulating pumps are heat preservation pumps.

[0020] Furthermore, the molten salt heating furnace system for reducing flow resistance also includes a first storage tank and a second storage tank, with the inlet of the feed pump connected to the first storage tank and the outlet pipeline connected to the second storage tank.

[0021] Using the above technical solution, molten salt at a lower temperature flows into the molten salt heat exchanger from the inlet under the pumping of the feed pump, and then flows out of the outlet of the molten salt heat exchanger into the mixing tank. Molten salt in the mixing tank flows into the molten salt furnace from the medium inlet under the pumping of the circulating pump. The molten salt in the molten salt furnace is heated and then flows out from the medium outlet of the molten salt furnace. A portion of the high-temperature molten salt flowing out from the medium outlet flows into the return pipeline and then back into the mixing tank. Another portion of the high-temperature molten salt flowing out from the medium outlet flows into the outlet pipeline and flows outward. The high-temperature flue gas generated by combustion in the molten salt furnace exchanges heat with the molten salt flowing into the furnace, thus heating the molten salt. The flue gas then exits from the flue gas outlet of the molten salt furnace and flows into the molten salt heat exchanger from the inlet. The flue gas flowing into the molten salt heat exchanger then exits from the outlet of the molten salt heat exchanger. The molten salt flowing into the molten salt heat exchanger is at a relatively low temperature, approximately 290°C. Within the heat exchanger, the molten salt exchanges heat with the flue gas flowing in from the inlet, raising its temperature. When the molten salt flows out of the heat exchanger into the mixing tank, its temperature has increased to 380-390°C. In the molten salt furnace, the molten salt, after being heated, flows out at a temperature of 565°C from the furnace's outlet. A portion of this 565°C molten salt flows back into the mixing tank via the return pipe, while the remaining portion flows out via the outlet pipe. In the mixing tank, the 380-390°C molten salt from the heat exchanger mixes with the 565°C molten salt from the furnace, resulting in a temperature of 515-520°C. A circulating pump then pumps this 515-520°C molten salt from the mixing tank back into the furnace to be heated to 565°C. In summary, in this embodiment, the molten salt with a lower temperature is first pumped into the molten salt heat exchanger by the feed pump to exchange heat with the flue gas, thereby raising the temperature of the molten salt. When the molten salt flows from the molten salt heat exchanger into the mixing tank, it mixes with the high-temperature molten salt flowing from the medium outlet into the mixing tank. The temperature of the mixed molten salt is further increased compared to the temperature of the molten salt in the molten salt heat exchanger. Then, the circulating pump pumps the molten salt in the mixing tank to the molten salt furnace for heating. This allows for a small temperature difference between the medium inlet and medium outlet of the molten salt furnace, only 45~50℃. Therefore, the length of the heat exchanger tubes in the molten salt furnace can be designed to be shorter, thereby shortening the path of the molten salt in the heat exchanger tubes and reducing the flow resistance of the molten salt. Thus, a circulating pump with a smaller head can be used to pump the molten salt, greatly reducing the power consumption of the circulating pump, reducing electricity costs, and improving economic efficiency. Furthermore, the molten salt in the molten salt heat exchanger flows from top to bottom, and the flow resistance of the molten salt flow is less than the potential energy of the molten salt between the inlet and outlet of the molten salt heat exchanger. Therefore, the flow resistance in the molten salt heat exchanger can be offset by the gravitational potential energy of the molten salt. As a result, the head requirement of the feed pump is also very low, and the power consumption of the feed pump is also very low. According to calculations, the total power consumption of the feed pump and the circulation pump is greatly reduced compared with the prior art.In summary, the molten salt heating furnace system for reducing flow resistance according to the embodiments of this application can heat molten salt from 290°C to 565°C, achieving large temperature difference heating and low flow resistance operation, ensuring safety and reliability. Furthermore, the temperature difference between the medium inlet and outlet of the molten salt furnace is only 45~50°C, with low thermal inertia, thus enabling the molten salt furnace to achieve stable heating at 565±0.5°C. Attached Figure Description

[0022] Figure 1 This is a process flow diagram of the molten salt heating furnace system for reducing flow resistance according to this utility model.

[0023] In the diagram: 1. Molten salt furnace; 2. Molten salt heat exchanger; 3. Mixing tank; 4. Feed pump; 5. Circulation pump; 6. Outlet pipeline; 7. Return pipeline; 8. Feed inlet; 9. Discharge outlet; 10. Medium inlet; 11. Medium outlet; 12. Flue gas outlet; 13. Burner; 14. Air preheater; 15. Fuel heater; 16. Blower; 17. Exhaust fan; 18. Inlet pipeline; 19. Regulating branch; 20. First regulating valve; 21. Electric stirrer; 22. Second regulating valve; 23. Third regulating valve. Detailed Implementation

[0024] To make the contents of this utility model easier to understand, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0025] like Figure 1 As shown, a molten salt heating furnace system for reducing flow resistance includes a molten salt furnace 1, a molten salt heat exchanger 2, a mixing tank 3, a feed pump 4, a circulation pump 5, an outlet pipeline 6, and a return pipeline 7.

[0026] The inlet of the feed pump 4 is used to receive molten salt, the outlet of the feed pump 4 is connected to the feed port 8 at the upper end of the molten salt heat exchanger 2, and the discharge port 9 at the lower end of the molten salt heat exchanger 2 is connected to the mixing tank 3.

[0027] The inlet of the circulating pump 5 is connected to the mixing tank 3, the outlet of the circulating pump 5 is connected to the medium inlet 10 of the molten salt furnace 1, the medium outlet 11 of the molten salt furnace 1 is connected to the outlet pipeline 6 and the return pipeline 7 respectively, and the return pipeline 7 is connected to the mixing tank 3.

[0028] The flue gas outlet 12 of the molten salt furnace 1 is connected to the air inlet of the molten salt heat exchanger 2, and the molten salt heat exchanger 2 also has an outlet for discharging the flue gas entering from the air inlet.

[0029] Specifically, under the pumping of the feed pump 4, the molten salt at a lower temperature flows into the molten salt heat exchanger 2 from the feed port 8 and then flows out from the discharge port 9 of the molten salt heat exchanger 2 into the mixing tank 3. The molten salt in the mixing tank 3 flows into the molten salt furnace 1 from the medium inlet 10 under the pumping of the circulating pump 5. The molten salt in the molten salt furnace 1 is heated and then flows out from the medium outlet 11 of the molten salt furnace 1. A portion of the high-temperature molten salt flowing out from the medium outlet 11 flows into the return pipe 7 and then flows back into the mixing tank 3. The other portion of the high-temperature molten salt flowing out from the medium outlet 11 flows into the outlet pipe 6 and flows outward. The high-temperature flue gas generated by combustion in the molten salt furnace 1 exchanges heat with the molten salt flowing into the furnace 1, thereby heating the molten salt. The flue gas then exits from the flue gas outlet 12 of the molten salt furnace 1 and flows into the molten salt heat exchanger 2 through the inlet. The flue gas flowing into the molten salt heat exchanger 2 then exits from the outlet of the molten salt heat exchanger 2. The molten salt flowing into the molten salt heat exchanger 2 through the feed inlet 8 is at a relatively low temperature, approximately 290°C. In the molten salt heat exchanger 2, the molten salt flowing in through the feed inlet 8 exchanges heat with the flue gas flowing in through the inlet, thereby raising the temperature of the molten salt. When the molten salt flows out from the outlet 9 of the molten salt heat exchanger 2 into the mixing tank 3, the temperature of the molten salt rises to 380~390°C. In the molten salt furnace 1, the molten salt is heated to a temperature of 565°C and flows out of the medium outlet 11. Part of the molten salt at 565°C flows back to the mixing tank 3 via the return pipe 7, while the other part flows out via the outlet pipe 6. In the mixing tank 3, the molten salt at 380-390°C from the molten salt heat exchanger 2 mixes with the molten salt at 565°C from the molten salt furnace 1, resulting in a temperature of 515-520°C. The circulating pump 5 pumps the molten salt at 515-520°C from the mixing tank 3 to the molten salt furnace 1 and heats it to 565°C. In summary, in this embodiment, the molten salt with a lower temperature is first pumped into the molten salt heat exchanger 2 by the feed pump 4 to exchange heat with the flue gas, thereby raising the temperature of the molten salt. When the molten salt flows from the molten salt heat exchanger 2 into the mixing tank 3, it will mix with the high-temperature molten salt flowing from the medium outlet 11 into the mixing tank 3. The temperature of the mixed molten salt is further increased compared to the temperature of the molten salt in the molten salt heat exchanger 2. Then, the circulating pump 5 pumps the molten salt in the mixing tank 3 to the molten salt furnace 1 for heating. This allows the temperature difference between the medium inlet 10 and the medium outlet 11 of the molten salt furnace 1 to be small, only 45~50℃. Therefore, the length of the heat exchanger tube in the molten salt furnace 1 can be designed to be shorter, thereby shortening the path of the molten salt in the heat exchanger tube and reducing the flow resistance of the molten salt. Therefore, a smaller head circulating pump 5 can be used to pump the molten salt, greatly reducing the power consumption of the circulating pump 5, reducing the power cost, and improving economic efficiency.Furthermore, the molten salt in the molten salt heat exchanger 2 flows from top to bottom. The flow resistance of the molten salt is less than the potential energy of the molten salt between the inlet 8 and outlet 9 of the molten salt heat exchanger 2. Therefore, the flow resistance in the molten salt heat exchanger 2 can be offset by the gravitational potential energy of the molten salt. Consequently, the head requirement of the feed pump 4 is also very low, and the power consumption of the feed pump 4 is also very low. Calculations show that the total power consumption of the feed pump 4 and the circulation pump 5 is significantly lower than that of the prior art. In summary, the molten salt heating furnace system for reducing flow resistance in this embodiment can heat molten salt from 290°C to 565°C, achieving large temperature difference heating and low flow resistance operation, ensuring safety and reliability. Moreover, the temperature difference between the medium inlet 10 and the medium outlet 11 of the molten salt furnace 1 is only 45~50°C, with low thermal inertia. Therefore, the molten salt furnace 1 can achieve stable heating at 565±0.5°C.

[0030] In this embodiment, the specific structure of the molten salt furnace 1 is based on existing technology, and may include, but is not limited to, the high-temperature binary molten salt furnace 1 using blast furnace gas disclosed in Chinese Patent No. CN222634790U. Specifically, molten salt flowing in from the medium inlet 10 of the molten salt furnace 1 enters the heat exchanger tubes in the molten salt furnace 1. The molten salt in the heat exchanger tubes then exchanges heat with the high-temperature flue gas generated during combustion in the molten salt furnace 1, is heated, and flows out from the medium outlet 11 of the molten salt furnace 1. In this embodiment, the molten salt heat exchanger 2 can be a shell-and-tube heat exchanger, and the heat exchange tubes in the molten salt heat exchanger 2 can be spiral finned tubes.

[0031] like Figure 1 As shown, a burner 13 is installed in the molten salt furnace 1. The combustion of the burner 13 can generate high-temperature flue gas in the molten salt furnace 1. The burner 13 can be a high-temperature low-NOx burner.

[0032] like Figure 1 As shown, the molten salt heating furnace system for reducing flow resistance may also include an air preheater 14, a fuel heater 15, a blower 16, and an induced draft fan 17.

[0033] The outlet of the blower 16 is connected to the air inlet of the air preheater 14, and the air outlet of the air preheater 14 is connected to the burner 13.

[0034] The gas inlet of the fuel heater 15 is used to receive fuel gas, and the gas outlet of the fuel heater 15 is connected to the burner 13;

[0035] The outlet of the molten salt heat exchanger 2 is connected to the flue gas inlet of the air preheater 14. The flue gas outlet 12 of the air preheater 14 is connected to the flue gas inlet of the fuel heater 15. The flue gas outlet 12 of the fuel heater 15 is connected to the inlet of the induced draft fan 17. The outlet of the induced draft fan 17 is connected to the chimney. Specifically, under the suction of the induced draft fan 17, the flue gas generated by the combustion of the burner 13 in the molten salt furnace 1 will be discharged from the flue gas outlet 12 and then flow sequentially through the molten salt heat exchanger 2, the air preheater 14, the fuel heater 15, and the induced draft fan 17 before being discharged from the chimney. Fuel gas will flow into the fuel heater 15 from the inlet pipe 18. The fuel gas flowing into the fuel heater 15 will exchange heat with the flue gas flowing into the fuel heater 15, thereby increasing the temperature of the fuel gas before it enters the burner 13 for combustion. The blower 16 is used to pump cold air into the air preheater 14. The air flowing into the air preheater 14 exchanges heat with the flue gas flowing into the air preheater 14, which raises the temperature of the air. Then the hot air flows into the burner 13 to assist combustion, thereby making full use of the waste heat in the flue gas, improving the thermal efficiency of the entire system, and making it more economical.

[0036] In this embodiment, the fuel heater 15 can be a gas-to-gas heat exchanger.

[0037] like Figure 1 As shown, the molten salt heating furnace system for reducing flow resistance may further include a regulating branch 19 and a first regulating valve 20. One end of the regulating branch 19 is connected to the outlet of the molten salt heat exchanger 2, and the other end of the regulating branch 19 is connected to the flue gas inlet of the fuel heater 15. The first regulating valve 20 is connected in the regulating branch 19. Specifically, after the flue gas flows out of the outlet of the molten salt heat exchanger 2, a portion of the flue gas flows through the air preheater 14 and then into the fuel heater 15, while another portion of the air flows directly into the fuel heater 15 from the regulating branch 19. When the workload of the burner 13 increases, more air is required. At this time, it is necessary to increase the operating speed of the blower 16 to pump more air into the air preheater 14, and at the same time, it is necessary to reduce the opening of the first regulating valve 20 so that more air flows through the air preheater 14 and then into the fuel heater 15, thereby preheating more air and keeping the temperature of the air entering the burner 13 for combustion within a reasonable range. When the working load of the burner 13 decreases, less air is required. At this time, it is necessary to reduce the operating speed of the blower 16 to pump less air into the air preheater 14. At the same time, it is necessary to increase the opening of the first regulating valve 20 so that less air flows from the air preheater 14 into the fuel heater 15, thereby preheating less air and keeping the temperature of the combustion air entering the burner 13 within a reasonable range.

[0038] like Figure 1 As shown, an electric stirrer 21 can be installed on the mixing tank 3. The electric stirrer 21 is used to stir the molten salt in the mixing tank 3, thereby making the temperature of the molten salt in the mixing tank 3 more uniform. A second regulating valve 22 is connected to the outlet pipe 6, and a third regulating valve 23 is connected to the return pipe 7. Two circulation pumps 5 are arranged in parallel. The circulation pumps 5 are heat preservation pumps, and one of the two circulation pumps 5 is in use and the other is on standby.

[0039] Specifically, the molten salt heating furnace system for reducing flow resistance may further include a first storage tank and a second storage tank, with the inlet of the feed pump 4 connected to the first storage tank and the outlet pipeline 6 connected to the second storage tank; wherein, the first storage tank is used to store molten salt at 290°C and the second storage tank is used to store molten salt at 565°C.

[0040] In summary, under the pumping of the feed pump 4, the molten salt with a lower temperature flows into the molten salt heat exchanger 2 from the feed port 8 and then flows out from the discharge port 9 of the molten salt heat exchanger 2 into the mixing tank 3. The molten salt in the mixing tank 3 flows into the molten salt furnace 1 from the medium inlet 10 under the pumping of the circulating pump 5. The molten salt in the molten salt furnace 1 is heated and then flows out from the medium outlet 11 of the molten salt furnace 1. A portion of the high-temperature molten salt flowing out from the medium outlet 11 flows into the return pipe 7 and then flows back into the mixing tank 3. The other portion of the high-temperature molten salt flowing out from the medium outlet 11 flows into the outlet pipe 6 and flows outward. The high-temperature flue gas generated by combustion in the molten salt furnace 1 exchanges heat with the molten salt flowing into the furnace 1, thereby heating the molten salt. The flue gas then exits from the flue gas outlet 12 of the molten salt furnace 1 and flows into the molten salt heat exchanger 2 through the inlet. The flue gas flowing into the molten salt heat exchanger 2 then exits from the outlet of the molten salt heat exchanger 2. The molten salt flowing into the molten salt heat exchanger 2 through the feed inlet 8 is at a relatively low temperature, approximately 290°C. In the molten salt heat exchanger 2, the molten salt flowing in through the feed inlet 8 exchanges heat with the flue gas flowing in through the inlet, thereby raising the temperature of the molten salt. When the molten salt flows out from the outlet 9 of the molten salt heat exchanger 2 into the mixing tank 3, the temperature of the molten salt rises to 380~390°C. In the molten salt furnace 1, the molten salt is heated to a temperature of 565°C and flows out of the medium outlet 11. Part of the molten salt at 565°C flows back to the mixing tank 3 via the return pipe 7, while the other part flows out via the outlet pipe 6. In the mixing tank 3, the molten salt at 380-390°C from the molten salt heat exchanger 2 mixes with the molten salt at 565°C from the molten salt furnace 1, resulting in a temperature of 515-520°C. The circulating pump 5 pumps the molten salt at 515-520°C from the mixing tank 3 to the molten salt furnace 1 and heats it to 565°C. In summary, in this embodiment, the molten salt with a lower temperature is first pumped into the molten salt heat exchanger 2 by the feed pump 4 to exchange heat with the flue gas, thereby raising the temperature of the molten salt. When the molten salt flows from the molten salt heat exchanger 2 into the mixing tank 3, it will mix with the high-temperature molten salt flowing from the medium outlet 11 into the mixing tank 3. The temperature of the mixed molten salt is further increased compared to the temperature of the molten salt in the molten salt heat exchanger 2. Then, the circulating pump 5 pumps the molten salt in the mixing tank 3 to the molten salt furnace 1 for heating. This allows the temperature difference between the medium inlet 10 and the medium outlet 11 of the molten salt furnace 1 to be small, only 45~50℃. Therefore, the length of the heat exchanger tube in the molten salt furnace 1 can be designed to be shorter, thereby shortening the path of the molten salt in the heat exchanger tube and reducing the flow resistance of the molten salt. Therefore, a smaller head circulating pump 5 can be used to pump the molten salt, greatly reducing the power consumption of the circulating pump 5, reducing the power cost, and improving economic efficiency.Furthermore, the molten salt in the molten salt heat exchanger 2 flows from top to bottom. The flow resistance of the molten salt is less than the potential energy of the molten salt between the inlet 8 and outlet 9 of the molten salt heat exchanger 2. Therefore, the flow resistance in the molten salt heat exchanger 2 can be offset by the gravitational potential energy of the molten salt. Consequently, the head requirement of the feed pump 4 is also very low, and the power consumption of the feed pump 4 is also very low. Calculations show that the total power consumption of the feed pump 4 and the circulation pump 5 is significantly lower than that of the prior art. In summary, the molten salt heating furnace system for reducing flow resistance in this embodiment can heat molten salt from 290°C to 565°C, achieving large temperature difference heating and low flow resistance operation, ensuring safety and reliability. Moreover, the temperature difference between the medium inlet 10 and the medium outlet 11 of the molten salt furnace 1 is only 45~50°C, with low thermal inertia. Therefore, the molten salt furnace 1 can achieve stable heating at 565±0.5°C.

[0041] The specific embodiments described above further illustrate the technical problems, technical solutions, and beneficial effects of this utility model. It should be understood that the above descriptions are merely specific embodiments of this utility model and are not intended to limit this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A molten salt heating furnace system for reducing flow resistance, characterized in that, It includes a molten salt furnace (1), a molten salt heat exchanger (2), a mixing tank (3), a feed pump (4), a circulation pump (5), an outlet pipeline (6), and a return pipeline (7). The inlet of the feed pump (4) is used to receive molten salt, the outlet of the feed pump (4) is connected to the feed port (8) at the upper end of the molten salt heat exchanger (2), and the discharge port (9) at the lower end of the molten salt heat exchanger (2) is connected to the mixing tank (3). The inlet of the circulating pump (5) is connected to the mixing tank (3), the outlet of the circulating pump (5) is connected to the medium inlet (10) of the molten salt furnace (1), the medium outlet (11) of the molten salt furnace (1) is connected to the outlet pipeline (6) and the return pipeline (7) respectively, and the return pipeline (7) is connected to the mixing tank (3). The flue gas outlet (12) of the molten salt furnace (1) is connected to the air inlet of the molten salt heat exchanger (2), which also has an outlet for discharging the flue gas introduced from the air inlet.

2. The molten salt heating furnace system for reducing flow resistance according to claim 1, characterized in that, The molten salt furnace (1) is equipped with a burner (13).

3. The molten salt heating furnace system for reducing flow resistance according to claim 2, characterized in that, It also includes an air preheater (14), a fuel heater (15), a blower (16) and an induced draft fan (17). The outlet of the blower (16) is connected to the air inlet of the air preheater (14), and the air outlet of the air preheater (14) is connected to the burner (13). The gas inlet of the fuel heater (15) is used to receive fuel gas, and the gas outlet of the fuel heater (15) is connected to the burner (13). The outlet of the molten salt heat exchanger (2) is connected to the flue gas inlet of the air preheater (14), the flue gas outlet (12) of the air preheater (14) is connected to the flue gas inlet of the fuel heater (15), and the flue gas outlet (12) of the fuel heater (15) is connected to the inlet of the induced draft fan (17).

4. The molten salt heating furnace system for reducing flow resistance according to claim 3, characterized in that, The outlet of the induced draft fan (17) is connected to the chimney.

5. The molten salt heating furnace system for reducing flow resistance according to claim 3, characterized in that, The fuel heater (15) is a gas-to-gas heat exchanger.

6. The molten salt heating furnace system for reducing flow resistance according to claim 3, characterized in that, It also includes a regulating branch (19) and a first regulating valve (20). One end of the regulating branch (19) is connected to the outlet of the molten salt heat exchanger (2), and the other end of the regulating branch (19) is connected to the flue gas inlet of the fuel heater (15). The first regulating valve (20) is connected in the regulating branch (19).

7. The molten salt heating furnace system for reducing flow resistance according to claim 1, characterized in that, An electric stirrer (21) is installed on the mixing tank (3).

8. The molten salt heating furnace system for reducing flow resistance according to claim 1, characterized in that, The outlet pipeline (6) is connected to a second regulating valve (22), and the return pipeline (7) is connected to a third regulating valve (23).

9. The molten salt heating furnace system for reducing flow resistance according to claim 1, characterized in that, Two circulating pumps (5) are connected in parallel, and the circulating pumps (5) are heat preservation pumps.

10. The molten salt heating furnace system for reducing flow resistance according to claim 1, characterized in that, It also includes a first storage tank and a second storage tank, with the inlet of the feed pump (4) connected to the first storage tank and the outlet pipeline (6) connected to the second storage tank.

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