Single-tank fused salt heat storage and steam supply system

Abstract

A single-tank fused salt heat storage and steam supply system comprises a fused salt storage tank, a cold fused salt pump pool, a cold fused salt submerged pump, a cold fused salt input pipeline, a cold fused salt heater, a hot fused salt input pipeline, a hot fused salt output pipeline, a hot fused salt pump pool, a hot fused salt submerged pump, an evaporator fused salt inlet pipeline and an evaporator connected with the tail end of the evaporator fused salt inlet pipeline. One end of the evaporator fused salt outlet pipeline is connected with the lower part of the fused salt storage tank, and the other end of the evaporator fused salt outlet pipeline is connected with the fused salt outlet end of the evaporator; the hot water pipeline is connected with the hot water end of the evaporator; the return water heater is connected with the hot water pipeline; one end of the fused salt backflow pipeline is connected with the lower side surface of the fused salt storage tank, and the other end is connected with the lower side surface of the hot fused salt pump pool. External steam supply is achieved, the molten salt heat release process is stable and balanced, stable heat storage and heat supply are achieved, and system operation is safe. The system can be widely applied to heat storage and steam supply systems.

Description

Technical Field

[0001] The invention relates to a single-tank molten salt heat storage and steam supply system, which can be widely used in heat storage and steam supply systems. Background Art

[0002] At present, in the field of heat storage, water heat storage systems are widely used. By utilizing electricity during off-peak hours and clean renewable electricity to heat the heat storage medium and store it in storage tanks, heat can be released flexibly when there is a demand for heating, thereby achieving a reasonable allocation and effective use of electricity resources.

[0003] In the existing molten salt heat storage system, the temperature of the hot molten salt inside the molten salt storage tank is unstable, and the heat release process of the molten salt is uneven, resulting in the situation that the liquid molten salt looks like clear water, while the solid molten salt is very hard. In addition, the existing system lacks emergency measures for blockage caused by molten salt condensation. When the system fails and stops operating, the molten salt in the system equipment and pipelines solidifies due to long-term shutdown, which is easy to cause system blockage and accidents, resulting in unsafe operation problems. Summary of the invention

[0004] The purpose of the present invention is to provide a single-tank molten salt heat storage and steam supply system with stable molten salt temperature, external steam supply, stable and balanced molten salt heat release process, stable heat storage and heat supply, and safe system operation.

[0005] In order to achieve the above-mentioned purpose, the single-tank molten salt heat storage and steam supply system of the present invention comprises a molten salt storage tank, a cold molten salt pump pool connected to a cold molten salt output pipeline at the lower part of the molten salt storage tank, a cold molten salt submersible pump vertically installed in the cold molten salt pump pool, a cold molten salt input pipeline connected to the upper end of the cold molten salt submersible pump, a cold molten salt heater connected to the end of the cold molten salt input pipeline, a hot molten salt input pipeline connected to the cold molten salt heater at one end and connected to the upper part of the molten salt storage tank at the other end, a hot molten salt output pipeline connected to the upper part of the molten salt storage tank, a hot molten salt pump pool connected to the hot molten salt output pipeline, and a vertical installation A hot molten salt submersible pump in a hot molten salt pump pool, an evaporator molten salt inlet pipe connected to the upper end of the hot molten salt submersible pump, an evaporator connected to the end of the evaporator molten salt inlet pipe, a steam supply pipe connected to the upper end of the evaporator, an evaporator molten salt outlet pipe connected at one end to the lower part of the molten salt storage tank and at the other end to the evaporator molten salt outlet end, a hot water pipe connected to the hot water end of the evaporator, a return water heater connected to the hot water pipe, a return water pipe connected to the return water heater, and a molten salt reflux pipe connected at one end to the lower side of the molten salt storage tank and at the other end to the lower side of the hot molten salt pump pool.

[0006] The single-tank molten salt heat storage and steam supply system of the present invention, the molten salt storage tank is also equipped with a sleeve electric heater on the lower side.

[0007] The single-tank molten salt heat storage and steam supply system of the present invention, the hot molten salt input pipeline and the hot molten salt output pipeline are both provided with a plurality of rectangular fluid spray holes at the bottom, and the ends of the pipelines are blocked.

[0008] In the single-tank molten salt heat storage and steam supply system of the present invention, the cold molten salt output pipeline and the evaporator molten salt outlet pipeline are both provided with a plurality of rectangular fluid spray holes at the top, and the ends of the pipelines are blocked.

[0009] The single-tank molten salt heat storage and steam supply system of the present invention, the hot molten salt input pipeline, the hot molten salt output pipeline, the cold molten salt output pipeline, and the evaporator molten salt outlet pipeline are inside the molten salt storage tank, and their ends are tilted downward, with an angle of 0° to 2.5° with the horizontal plane.

[0010] The single-tank molten salt heat storage and steam supply system of the present invention, the cold molten salt pump pool and the hot molten salt pump pool are cylindrical closed containers.

[0011] The single-tank molten salt heat storage and steam supply system of the present invention, the evaporator is a kettle-type evaporator.

[0012] The single-tank molten salt heat storage and steam supply system of the present invention, the cold molten salt heater is a molten salt electric heater.

[0013] The single-tank molten salt heat storage steam supply system of the present invention, the evaporator is used for heat exchange between molten salt and heating return water, the tube side is molten salt, the shell side is hot water, and steam is produced for use by the user end. The cold molten salt at the bottom of the molten salt storage tank enters the cold molten salt pump pool through the cold molten salt output pipeline. Under the drive of the cold molten salt submersible pump, the cold molten salt at the bottom of the molten salt storage tank is extracted, and the cold molten salt is transported to the cold molten salt electric heater through the cold molten salt input pipeline for heating. The heated hot molten salt enters the upper part of the molten salt storage tank through the hot molten salt input pipeline. When the molten salt releases heat, the hot molten salt enters the hot molten salt pump pool through the hot molten salt output pipeline, and the hot molten salt in the hot molten salt pump pool is extracted through the evaporator molten salt inlet pipeline through the hot molten salt submersible pump and transported to the evaporator for heat exchange. The molten salt after heat release flows back to the bottom of the molten salt storage tank, and the return water heated by the molten salt becomes steam for use by the user end. Therefore, external steam supply is achieved.

[0014] The single-tank molten salt heat storage and steam supply system of the present invention, as the molten salt releases heat, the temperature gradient layer of the cold molten salt and the hot molten salt in the molten salt storage tank gradually rises from the bottom to the top, and the inlet and outlet pipes in the molten salt storage tank, that is, the hot molten salt input pipe, the hot molten salt output pipe, the cold molten salt output pipe, and the evaporator molten salt outlet pipe, are all provided with a number of rectangular fluid spray holes, and the pipe ends are blocked, so that the molten salt input and output flows in the molten salt storage tank are smoothed, reducing the disturbance to the molten salt in the molten salt storage tank, maintaining the stability of the temperature gradient layer of the molten salt storage tank, and the output hot molten salt temperature changes very little, and the hot molten salt temperature is stable. Moreover, compared with the traditional water heat storage system, the present invention adopts a molten salt heat storage system, the molten salt has a wider operating temperature range, more stable properties at high temperatures, and a larger specific heat capacity, higher thermal conductivity, and a large heat storage density per unit volume, which is more suitable as a heat storage medium. Therefore, the molten salt heat release process is stable and balanced, and stable heat storage and heating is achieved.

[0015] The single-tank molten salt heat storage and steam supply system of the present invention, the hot molten salt input pipeline, the hot molten salt output pipeline, the cold molten salt output pipeline, the evaporator molten salt outlet pipeline, and the molten salt reflux pipeline are arranged at an inclined angle inside the molten salt storage tank, and the ends thereof are tilted downward, and the angle with the horizontal plane is 0° to 2.5°, so that when the system fails and stops running, the molten salt in these pipelines can be returned to the molten salt storage tank by gravity for temporary storage, so as to prevent the molten salt in the pipeline from condensing and clogging due to long-term shutdown of the system. In addition, the present invention is also provided with a sleeve electric heater at the bottom of the molten salt storage tank, and the sleeve electric heater separates the molten salt and the heating unit by an external sleeve, which is used to prevent the condensation of the bottom molten salt in the initial stage of salt injection, or to keep the molten salt in the molten salt storage tank in a liquid state during shutdown, so as to start the system at any time. Therefore, the system operates safely.

[0016] In summary, the single-tank molten salt heat storage and steam supply system of the present invention realizes external steam supply, the molten salt heat release process is stable and balanced, stable heat storage and heat supply are achieved, and the system operates safely. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present invention will be further described below in conjunction with the accompanying drawings and embodiments thereof.

[0018] Figure 1 It is a schematic diagram of the structure of the present invention; Figure 2 yes Figure 1 A schematic diagram of a partial enlarged structure of a plurality of rectangular fluid spray holes are provided at the bottom of the hot molten salt input pipe and the hot molten salt output pipe; Figure 3 yes Figure 1 A schematic diagram of a partial enlarged structure of a plurality of rectangular fluid spray holes are provided on the top of the cold molten salt output pipeline and the evaporator molten salt outlet pipeline; Figure 4 yes Figure 3 AA section view in; Figure 5 yes Figure 4 BB section view in. DETAILED DESCRIPTION

[0019] exist Figure 1 to Figure 5 In the present invention, the single-tank molten salt heat storage and steam supply system comprises a molten salt storage tank 1, a cold molten salt pump pool 3 connected to a cold molten salt output pipeline 2 at the lower part of the molten salt storage tank, a cold molten salt submerged pump 4 vertically installed in the cold molten salt pump pool, a cold molten salt input pipeline 5 connected to the upper end of the cold molten salt submerged pump, a cold molten salt heater 6 connected to the end of the cold molten salt input pipeline, a hot molten salt input pipeline 7 connected to the cold molten salt heater at one end and connected to the upper part of the molten salt storage tank at the other end, a hot molten salt output pipeline 8 connected to the upper part of the molten salt storage tank, a hot molten salt pump pool 9 connected to the hot molten salt output pipeline, and a hot molten salt pump pool 9 vertically installed in the hot molten salt pump pool. A molten salt submersible pump 10, an evaporator molten salt inlet pipe 11 connected to the upper end of the hot molten salt submersible pump, an evaporator 12 connected to the end of the evaporator molten salt inlet pipe, a steam supply pipe 13 connected to the upper end of the evaporator, an evaporator molten salt outlet pipe 14 connected at one end to the lower part of the molten salt storage tank and the other end to the evaporator molten salt outlet end, a hot water pipe 15 connected to the hot water end of the evaporator, a return water heater 16 connected to the hot water pipe, a return water pipe 17 connected to the return water heater, and a molten salt reflux pipe 18 connected at one end to the lower side of the molten salt storage tank and the other end to the lower side of the hot molten salt pump pool.

[0020] The single-tank molten salt heat storage and steam supply system of the present invention, the molten salt storage tank is also equipped with a sleeve electric heater 19 on the lower side.

[0021] exist Figure 2 , Figure 4 In the single-tank molten salt heat storage and steam supply system of the present invention, the hot molten salt input pipeline and the hot molten salt output pipeline are both provided with a plurality of rectangular fluid spray holes a at the bottom, and the ends of the pipelines are blocked.

[0022] exist Figure 3 , Figure 5 In the single-tank molten salt heat storage and steam supply system of the present invention, the cold molten salt output pipeline and the evaporator molten salt outlet pipeline are both provided with a plurality of rectangular fluid spray holes b at the top, and the ends of the pipelines are blocked.

[0023] The single-tank molten salt heat storage and steam supply system of the present invention, the hot molten salt input pipeline, the hot molten salt output pipeline, the cold molten salt output pipeline, the evaporator molten salt outlet pipeline, and the molten salt reflux pipeline are inside the molten salt storage tank, and their ends are tilted downward, and the angle α with the horizontal plane is 0° to 2.5°.

[0024] The single-tank molten salt heat storage and steam supply system of the present invention, the cold molten salt pump pool and the hot molten salt pump pool are cylindrical closed containers.

[0025] The single-tank molten salt heat storage and steam supply system of the present invention, the evaporator is a kettle-type evaporator.

[0026] The single-tank molten salt heat storage and steam supply system of the present invention, the cold molten salt heater is a molten salt electric heater.

[0027] The single-tank molten salt heat storage and steam supply system of the present invention is only a preferred embodiment of the present invention, and does not impose any form of limitation on the present invention. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technician familiar with this profession can make some changes or modifications to equivalent embodiments of equivalent changes by using the technical contents disclosed above without departing from the scope of the technical solution of the present invention. However, any simple modification, equivalent replacement and improvement of the above embodiments made according to the technical essence of the present invention, within the spirit and principles of the present invention, still fall within the protection scope of the technical solution of the present invention.

Claims

1. A single tank molten salt heat storage steam supply system, characterized in that: The invention comprises a molten salt storage tank, a cold molten salt pump pool connected to the cold molten salt output pipeline at the lower part of the molten salt storage tank, a cold molten salt submersible pump vertically installed in the cold molten salt pump pool, a cold molten salt input pipeline connected to the upper end of the cold molten salt submersible pump, a cold molten salt heater connected to the end of the cold molten salt input pipeline, a hot molten salt input pipeline connected to the cold molten salt heater at one end and connected to the upper part of the molten salt storage tank at the other end, a hot molten salt output pipeline connected to the upper part of the molten salt storage tank, a hot molten salt pump pool connected to the hot molten salt output pipeline, a hot molten salt submersible pump vertically installed in the hot molten salt pump pool, and a hot molten salt submersible pump pool connected to the hot molten salt output pipeline. Pump, an evaporator molten salt inlet pipe connected to the upper end of the hot molten salt submersible pump, an evaporator connected to the end of the evaporator molten salt inlet pipe, a steam supply pipe connected to the upper end of the evaporator, an evaporator molten salt outlet pipe connected at one end to the lower part of the molten salt storage tank and the other end to the evaporator molten salt outlet end, a hot water pipe connected to the hot water end of the evaporator, a return water heater connected to the hot water pipe, a return water pipe connected to the return water heater, a molten salt reflux pipe connected at one end to the lower side of the molten salt storage tank and the other end to the lower side of the hot molten salt pump pool.

2. The single-tank molten salt heat storage and steam supply system according to claim 1 is characterized in that: The molten salt storage tank is also provided with a sleeve electric heater on the lower side.

3. The single-tank molten salt heat storage and steam supply system according to claim 1 is characterized in that: The hot molten salt input pipeline and the hot molten salt output pipeline are both provided with a plurality of rectangular fluid spray holes at the bottom, and the ends of the pipelines are blocked.

4. The single-tank molten salt heat storage and steam supply system according to claim 1 is characterized in that: The cold molten salt output pipeline and the evaporator molten salt outlet pipeline are both provided with a plurality of rectangular fluid spray holes at the top, and the ends of the pipelines are blocked.

5. The single-tank molten salt heat storage and steam supply system according to claim 1 is characterized in that: The hot molten salt input pipeline, the hot molten salt output pipeline, the cold molten salt output pipeline, and the evaporator molten salt outlet pipeline are inside the molten salt storage tank, and their ends are tilted downward, with an angle of 0° to 2.5° with the horizontal plane.

6. The single-tank molten salt heat storage and steam supply system according to claim 1 is characterized in that: The cold molten salt pump pool and the hot molten salt pump pool are cylindrical closed containers.

7. The single-tank molten salt heat storage and steam supply system according to claim 1 is characterized in that: The evaporator is a kettle type evaporator.

8. The single-tank molten salt heat storage and steam supply system according to claim 1 is characterized in that: The cold molten salt heater is a molten salt electric heater.

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