Preheating anti-condensation emptying system suitable for heat exchanger with fused salt flowing on pipe side

Abstract

The invention discloses a preheating anti-condensation emptying system suitable for a heat exchanger with molten salt flowing on a pipe side, and belongs to the technical field of molten salt energy storage. According to the invention, the technical problem that the fused salt is easy to condense due to the structural arrangement when the fused salt passes through the pipe side of the existing fused salt energy storage system is solved. A preheating anti-condensation emptying system suitable for a heat exchanger with molten salt flowing on the pipe side comprises the molten salt heat exchanger, a draught fan, an air heater, a ventilation valve, an emptying valve, an inlet valve and a salt dredging tank. An air outlet of the fan is communicated with the air heater, an air outlet of the air heater is connected with the input end of a tube box of the molten salt heat exchanger through a ventilation valve, the output end of the tube box of the molten salt heat exchanger is connected with the salt dredging tank through an inlet valve, and the output end of the tube box of the molten salt heat exchanger is connected with the atmosphere through an emptying valve. And the requirements for preheating, condensation prevention and emptying of the molten salt heat exchanger in the mode that molten salt flows on the pipe side are met. The invention is used for the fused salt energy storage system.

Description

Technical Field

[0001] This invention relates to a preheating, anti-condensation, and venting system suitable for heat exchangers with molten salt flowing on the tube side, belonging to the field of molten salt energy storage technology. Background Technology

[0002] New power systems are becoming increasingly reliant on renewable energy sources, are more susceptible to weather and seasonal variations, and have a growing demand for adjustable resources.

[0003] The basic principle of molten salt energy storage involves storing energy as heat in a high-temperature medium, so that it can be converted into electrical energy when needed. Compared with other energy storage technologies, molten salt energy storage has unique advantages such as providing heat and being compatible with traditional power generation technologies, making it a promising solution for peak-shaving ancillary services, system heating, and energy storage.

[0004] In existing molten salt energy storage systems, to prevent molten salt condensation, most molten salt heat exchangers adopt a molten salt shell-side configuration. However, for molten salt steam generators or molten salt-air heat exchangers, if a molten salt shell-side configuration is adopted, the equipment will have a large footprint and significant pressure loss on the water or air side, affecting system investment and system efficiency.

[0005] In summary, existing molten salt energy storage systems using the pipe-side molten salt method suffer from the technical problem of molten salt easily condensing due to their structural layout. Summary of the Invention

[0006] This invention addresses the technical problem of easy condensation of molten salt in existing molten salt energy storage systems with pipe-side molten salt flow due to their structural arrangement. It proposes a preheating, anti-condensation, and venting system suitable for heat exchangers with pipe-side molten salt flow, comprising a molten salt heat exchanger, a fan, an air heater, a ventilation valve, a venting valve, an inlet valve, and a salt condensation tank.

[0007] The air outlet of the blower is connected to the air heater. The air outlet of the air heater is connected to the input end of the tube box of the molten salt heat exchanger through a ventilation valve. The output end of the tube box of the molten salt heat exchanger is connected to the brine tank through an inlet valve. The output end of the tube box of the molten salt heat exchanger is connected to the atmosphere through an exhaust valve.

[0008] As another improvement of the present invention, it also includes a cylinder heating assembly, the two ends of which are respectively connected to the input end and the output end of the molten salt heat exchanger cylinder.

[0009] As another improvement of the present invention, the cylinder heating assembly includes a feedwater electric heater and a feedwater pump connected in sequence, the input end of the molten salt heat exchanger cylinder is connected to the output end of the feedwater electric heater, and the output end of the molten salt heat exchanger cylinder is connected to the input end of the feedwater pump.

[0010] As another improvement of the present invention, the feedwater electric heater and the feedwater pump are both arranged below the molten salt heat exchanger.

[0011] As another improvement of the present invention, it also includes a tube box electric tracing cable, which is installed on the outer side of the wall of the molten salt heat exchanger tube box.

[0012] As another improvement of the present invention, it also includes a pipe box insulation layer, which is installed on the outside of the pipe box electric heating cable.

[0013] As another improvement of the present invention, it also includes a cylindrical electric heating tape, which is installed on the outer side of the wall of the molten salt heat exchanger cylinder.

[0014] As another improvement of the present invention, it also includes a cylinder insulation layer, which is installed on the outside of the cylinder electric heating cable.

[0015] As another improvement of the present invention, the salt-free tank is arranged below the molten salt heat exchanger.

[0016] As another improvement of the present invention, a pressure relief port is provided on the top surface of the salt-repellent container wall.

[0017] The beneficial effects of this invention are:

[0018] This invention provides a preheating, anti-condensation, and venting system for molten salt heat exchangers with molten salt flowing on the tube side. The system utilizes a fan, an electric air heater, an electric heating tape, an insulation layer, an electric feedwater heater, and a feedwater pump to achieve preheating, anti-condensation, and venting functions for the heat exchanger. The system can meet the preheating requirements of molten salt heat exchangers with molten salt flowing on the tube side before startup; it can meet the anti-condensation requirements of molten salt heat exchangers with molten salt flowing on the tube side; and it can meet the molten salt venting requirements of molten salt heat exchangers with molten salt flowing on the tube side in emergency situations. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of a preheating, anti-condensation, and venting system for a heat exchanger with molten salt flowing on the tube side, according to the present invention. Detailed Implementation

[0020] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. In the description of the present invention, it should be noted that the positional relationships indicated by terms such as "upper," "lower," "left," "right," "front," and "rear" are only based on the positional relationships shown in the accompanying drawings and are only for the convenience of describing the present invention, and are not intended to indicate or imply that the referred components have a specific orientation, or are constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention.

[0021] Specific implementation method one: Combining Figure 1 This embodiment describes a preheating, anti-condensation, and venting system suitable for heat exchangers with molten salt flowing on the tube side. It includes a molten salt heat exchanger 1, a fan 2, an air heater 3, a ventilation valve 13, a venting valve 11, an inlet valve 12, and a brine tank 9.

[0022] The air outlet of the fan 2 is connected to the air heater 3. The air outlet of the air heater 3 is connected to the input end of the tube box of the molten salt heat exchanger 1 through the ventilation valve 13. The output end of the tube box of the molten salt heat exchanger 1 is connected to the salt evacuation tank 9 through the inlet valve 12. The output end of the tube box of the molten salt heat exchanger 1 is connected to the atmosphere through the exhaust valve 11.

[0023] Fan 2 sends air into air heater 3 to heat the air. The heated air passes through the tube side of molten salt heat exchanger, heating tube box and heat exchange tube, and is then discharged into the atmosphere through exhaust valve 11.

[0024] When molten salt needs to be vented, open the ventilation valve 13 and the brine tank inlet valve 12, turn on the fan and the air electric heater, and discharge the molten salt on the tube side of the molten salt heat exchanger into the brine tank 9 through hot air.

[0025] The system can meet the preheating requirements of molten salt heat exchangers with molten salt flowing on the tube side before startup; the system can meet the anti-condensation requirements of molten salt heat exchangers with molten salt flowing on the tube side; and the system can meet the molten salt venting requirements of molten salt heat exchangers with molten salt flowing on the tube side in emergency situations.

[0026] Specific Implementation Method Two: Combining Figure 1 This embodiment differs from specific embodiment one in that it further includes a cylinder heating assembly, with its two ends connected to the input and output ends of the molten salt heat exchanger 1 cylinder, respectively. The purpose of this design is to heat the water inside the molten salt heat exchanger cylinder, gradually increasing the water pressure and temperature, thereby improving heat exchange efficiency. Other components and connections are the same as in specific embodiment one.

[0027] Specific implementation method three: Combining Figure 1 This embodiment differs from specific embodiment one in that the cylinder heating assembly includes a feedwater electric heater 7 and a feedwater pump 10 connected in sequence. The input end of the molten salt heat exchanger 1 cylinder is connected to the output end of the feedwater electric heater 7, and the output end of the molten salt heat exchanger 1 cylinder is connected to the input end of the feedwater pump 10. The purpose of this design is to heat the water inside the molten salt heat exchanger cylinder through the feedwater electric heater 7 and the feedwater pump 10, gradually increasing the water pressure and temperature, thereby improving heat exchange efficiency. Other components and connections are the same as in specific embodiment one or two.

[0028] Specific implementation method four: Combination Figure 1 This embodiment differs from specific embodiment one in that both the feedwater electric heater 7 and the feedwater pump 10 are arranged below the molten salt heat exchanger 1. This design results in a compact and rational structure, using the feedwater electric heater 7 and the feedwater pump 10 to heat the water inside the molten salt heat exchanger cylinder, gradually increasing the water pressure and temperature, thereby improving heat exchange efficiency. Other components and connections are the same as in any one of specific embodiments one to three.

[0029] Specific Implementation Method Five: Combining Figure 1 This embodiment differs from specific embodiment one in that it also includes a tube box electric heating cable 5, which is installed on the outer wall of the tube box of the molten salt heat exchanger 1. The tube box is heated by the electric heating cable, improving heat exchange efficiency. Other components and connection methods are the same as in any one of specific embodiments one to four.

[0030] Specific Implementation Method Six: Combination Figure 1 This embodiment differs from specific embodiment one in that it further includes a tube box insulation layer 4, which is installed on the outside of the tube box electric heating cable 5. The tube box insulation layer provides insulation for the tube box of the molten salt heat exchanger 1, preventing heat loss and improving heat exchange efficiency. Other components and connection methods are the same as in any one of specific embodiments one to five.

[0031] Specific implementation method seven: Combining Figure 1 This embodiment differs from specific embodiment one in that it also includes a cylindrical electric heating cable 6, which is installed on the outer wall of the molten salt heat exchanger 1. The cylindrical electric heating cable 6 heats the molten salt heat exchanger 1, improving heat exchange efficiency. Other components and connections are the same as in any one of specific embodiments one through six.

[0032] Specific implementation method eight: Combination Figure 1This embodiment differs from specific embodiment one in that it further includes a cylindrical insulation layer 8, which is installed on the outside of the cylindrical electric heating cable 6. The cylindrical insulation layer insulates the molten salt heat exchanger 1, preventing heat loss and improving heat exchange efficiency. Other components and connections are the same as in any one of specific embodiments one through seven.

[0033] Specific Implementation Method Nine: Combining Figure 1 This embodiment differs from specific embodiment one in that the brine trap 9 is located below the molten salt heat exchanger 1. By opening the ventilation valve 13 and the brine trap inlet valve 12, molten salt on the tube side of the molten salt heat exchanger is discharged into the brine trap 9 by gravity. Other components and connections are the same as in any one of specific embodiments one through eight.

[0034] Specific Implementation Method Ten: Combining Figure 1 This embodiment differs from specific embodiment one in that the top surface of the brine tank 9 is provided with a pressure relief port. This design prevents excessive pressure inside the brine tank from affecting molten salt discharge and improves the efficiency of discharging molten salt from the molten salt heat exchanger tube side into the brine tank 9. Other components and connections are the same as in any one of specific embodiments one through nine.

[0035] Combination Figure 1 Explanation of the working principle of this invention:

[0036] Fan 2 sends air into air heater 3 to heat the air. The heated air passes through the tube side of the molten salt heat exchanger, the heating tube box, and the heat exchange tubes, and is then discharged into the atmosphere through vent valve 11. When molten salt needs to be vented, vent valve 13 and brine tank inlet valve 12 are opened, and the fan and air electric heater are turned on to discharge the molten salt from the tube side of the molten salt heat exchanger into the brine tank 9 using hot air.

[0037] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A preheating, anti-condensation, and venting system suitable for heat exchangers with molten salt flowing on the tube side, characterized in that... It includes a molten salt heat exchanger (1), a fan (2), an air heater (3), a ventilation valve (13), an exhaust valve (11), an inlet valve (12), and a brine tank (9). The air outlet of the blower (2) is connected to the air heater (3). The air outlet of the air heater (3) is connected to the input end of the tube box of the molten salt heat exchanger (1) through the ventilation valve (13). The output end of the tube box of the molten salt heat exchanger (1) is connected to the salt evacuation tank (9) through the inlet valve (12). The output end of the tube box of the molten salt heat exchanger (1) is connected to the atmosphere through the exhaust valve (11).

2. The preheating, anti-condensation, and venting system for heat exchangers with molten salt flowing on the tube side according to claim 1, characterized in that... It also includes a cylinder heating assembly, the two ends of which are connected to the input and output ends of the molten salt heat exchanger (1) cylinder, respectively.

3. A preheating and anti-condensation venting system for heat exchangers with molten salt flowing on the tube side, as described in claim 2, is characterized in that... The cylinder heating assembly includes a water supply electric heater (7) and a water supply pump (10) connected in sequence. The input end of the molten salt heat exchanger (1) cylinder is connected to the output end of the water supply electric heater (7), and the output end of the molten salt heat exchanger (1) cylinder is connected to the input end of the water supply pump (10).

4. A preheating and anti-condensation venting system for heat exchangers with molten salt flowing on the tube side, as described in claim 2, is characterized in that... The water supply electric heater (7) and the water supply pump (10) are both arranged below the molten salt heat exchanger (1).

5. A preheating, anti-condensation, and venting system for heat exchangers with molten salt flowing on the tube side, as described in claim 1, is characterized in that... It also includes a tube box electric tracing cable (5), which is installed on the outside of the wall of the tube box of the molten salt heat exchanger (1).

6. A preheating and anti-condensation venting system for heat exchangers with molten salt flowing on the tube side, as described in claim 5, is characterized in that... It also includes a pipe box insulation layer (4), which is installed on the outside of the pipe box electric heating cable (5).

7. A preheating, anti-condensation, and venting system for heat exchangers with molten salt flowing on the tube side, as described in claim 1, is characterized in that... It also includes a cylindrical electric heating cable (6), which is installed on the outside of the wall of the molten salt heat exchanger (1).

8. A preheating and anti-condensation venting system for heat exchangers with molten salt flowing on the tube side, as described in claim 1, is characterized in that... It also includes a cylindrical insulation layer (8), which is installed on the outside of the cylindrical electric heating cable (6).

9. A preheating and anti-condensation venting system for heat exchangers with molten salt flowing on the tube side, as described in claim 1, is characterized in that... The salt condenser (9) is located below the molten salt heat exchanger (1).

10. A preheating and anti-condensation venting system for a heat exchanger with molten salt flowing on the tube side, as described in claim 9, is characterized in that... The top surface of the wall of the salt tank (9) is provided with a pressure relief port.

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