Kinetic energy recovery device for hot salt downcomer of tower-type molten salt heat absorber

Abstract

The invention discloses a kinetic energy recovery device for a tower-type molten salt heat absorber hot salt downcomer, relates to the technical field of power transmission tower vibration detection, and aims to solve the problems that the gravity pressure difference of molten salt in a downcomer is large, the molten salt cannot directly enter a molten salt storage tank, and a plurality of pressure reducing valve groups are generally arranged on the downcomer in the conventional design at present; the heat absorber comprises a heat absorber outlet fused salt tank, a heat absorber hot salt descending pipe and a hot fused salt storage tank, wherein the heat absorber outlet fused salt tank comprises a heat absorber outlet fused salt tank, a heat absorber hot salt descending pipe and a hot fused salt storage tank; an outlet of the heat absorber outlet fused salt tank communicates with an inlet of the hot fused salt storage tank through a heat absorber hot salt descending pipe, a power generation device inlet valve I and a power generation device I are adjacently arranged on the heat absorber hot salt descending pipe from top to bottom, and the power generation device I is used for converting kinetic energy of fused salt in the heat absorber hot salt descending pipe into electric energy. The device is used for tower type fused salt photo-thermal power generation and falling fused salt kinetic energy power generation.

Description

Technical Field

[0001] The invention relates to the technical field of transmission tower vibration detection, and in particular to a kinetic energy recovery device for a hot salt downcomer of a tower-type molten salt heat absorber. Background Art

[0002] With the acceleration of my country's energy transformation, the installed capacity of wind power and photovoltaic power will increase rapidly, and the power system has an increasingly urgent need for energy storage capacity and non-fossil flexible power supply. Solar thermal power generation is a solar power generation method that integrates power generation and energy storage. It has good reliability and regulation characteristics. At the same time, it can provide rotational inertia for the system. It is one of the rare technical means to maintain the safe and stable operation of a high-proportion new energy power system. Tower molten salt solar thermal power generation uses a large-scale array of parabolic or dish-shaped mirrors to collect solar thermal energy, heat molten salt, provide steam through a heat exchange device, and combine the process of traditional steam turbine generators to achieve the purpose of power generation. This form of solar energy utilization has an advantage that other forms of solar energy conversion cannot match, that is, by storing high-temperature molten salt on a large scale, it can still drive steam turbine power generation a few hours after the sun sets. Its biggest advantage is that the power output is stable, which can be used for basic power and peak regulation.

[0003] As one of the core components of tower molten salt solar thermal power generation, the absorber is installed on the top of the absorber tower about 200m high. The hot molten salt storage tank is arranged at 0m. The descending hot salt contains large potential energy. For example, the rated flow of the absorber is 180t / h, and its gravitational potential energy is about 1MW.h. Due to the large gravitational pressure difference of the molten salt in the descending pipeline, it cannot directly enter the molten salt storage tank. The current conventional design is to generally have multiple groups of pressure reducing valve groups on the downcomer. Due to the large pressure difference before and after the valve, the pressure reducing valve is easy to wear, and the investment and replacement costs are high. Summary of the invention

[0004] In order to solve the problem that the molten salt cannot directly enter the molten salt storage tank due to the large gravity pressure difference in the downcomer, the current conventional design is to generally provide multiple groups of pressure reducing valve groups on the downcomer. Since the pressure difference before and after the valve is too large, the pressure reducing valve is easy to damage, and the investment and replacement costs are high. Therefore, a kinetic energy recovery device for the hot salt downcomer of a tower molten salt heat absorber is provided to solve the problems raised in the above background technology.

[0005] The technical solution of the present invention is:

[0006] A kinetic energy recovery device for a hot salt downcomer of a tower molten salt heat absorber, comprising a molten salt tank at a heat absorber outlet, a hot salt downcomer of the heat absorber and a hot molten salt storage tank; the outlet of the molten salt tank at the heat absorber outlet is connected to the inlet of the hot molten salt storage tank through the hot salt downcomer of the heat absorber, and a power generation device inlet valve I and a power generation device I are adjacently arranged on the hot salt downcomer of the heat absorber from top to bottom, and the power generation device I is used to convert the kinetic energy of the molten salt in the hot salt downcomer of the heat absorber into electrical energy;

[0007] An emergency pipeline I is provided on the hot salt downcomer of the heat absorber. The emergency pipeline I is connected in parallel with the inlet valve I of the power generation device and the power generation device I. The emergency pipeline I is provided with an emergency pipeline switching valve I and an emergency pipeline pressure reducing valve I in sequence from top to bottom.

[0008] Furthermore, a power generation device inlet valve II and a power generation device II are adjacently arranged on the heat absorber hot salt downcomer from top to bottom, and the power generation device II is used to convert the kinetic energy of the molten salt in the heat absorber hot salt downcomer into electrical energy;

[0009] An emergency pipeline II is arranged on the hot salt downcomer of the absorber. The emergency pipeline II is connected in parallel with the inlet valve II of the power generation unit and the power generation unit II. An emergency pipeline switching valve II and an emergency pipeline pressure reducing valve II are arranged in sequence from top to bottom in the emergency pipeline II.

[0010] Furthermore, an expansion joint I is provided in the heat absorber hot salt downcomer between the heat absorber outlet molten salt tank and the power generation device inlet valve I, an expansion joint II is provided on the heat absorber hot salt downcomer between the power generation device I and the power generation device inlet valve II, and an expansion joint III is provided on the heat absorber hot salt downcomer between the power generation device II and the hot molten salt storage tank.

[0011] Furthermore, the power generation device I and the power generation device II adopt a rotary molten salt generator.

[0012] Furthermore, the absorber hot salt downcomer connecting the absorber outlet molten salt tank and the hot molten salt storage tank is vertically arranged.

[0013] Furthermore, the power generation device inlet valve I and the power generation device I are arranged in the middle of the heat absorber hot salt downcomer, and the power generation device inlet valve II and the power generation device II are arranged at the bottom of the heat absorber hot salt downcomer.

[0014] Furthermore, the power generation device inlet valve I, the emergency pipeline switching valve I, the power generation device inlet valve II and the emergency pipeline switching valve II adopt three-eccentric butterfly valves.

[0015] Furthermore, the emergency pipeline pressure reducing valve I and the emergency pipeline pressure reducing valve II are single-seat valves.

[0016] Furthermore, the molten salt tank at the outlet of the absorber is arranged on the top of the absorber tower with a height of 180-220m.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] 1. A kinetic energy recovery device for the hot salt downcomer of a tower molten salt heat absorber. The molten salt tank at the heat absorber outlet is connected to the hot molten salt storage tank through the vertically arranged hot salt downcomer of the heat absorber. The hot salt downcomer of the heat absorber is provided with power generation devices I and II. The power generation devices I and II are used to convert the kinetic energy of the molten salt's descent into electrical energy to achieve kinetic energy recovery. The power generation devices I and II will reduce the descent speed of the molten salt, replacing the pressure reducing valve group of the hot salt downcomer of the heat absorber, and reduce the pressure of the molten salt in the downcomer pipeline.

[0019] 2. An emergency pipeline I is connected in parallel beside the inlet valve I of the power generation device and the power generation device I. When the power generation device I fails, the inlet valve I of the power generation device is closed, the emergency pipeline switching valve I is opened, and the molten salt is introduced into the emergency pipeline I. The molten salt is decompressed through the emergency pipeline pressure reducing valve I in the emergency pipeline I. The decompression principle of the inlet valve II of the power generation device is the same as above. When the power generation device I fails, the molten salt can be transported downward normally to prevent the downcomer from being over-pressured due to the blockage of the molten salt, which may cause it to rupture.

[0020] 3. There are power generation devices I and II. When a power generation device fails, the molten salt can be transported downward normally through the emergency pipeline. At this time, the other power generation device can operate normally to complete the kinetic energy recovery of the molten salt. When a single power generation device fails, the molten salt kinetic energy power generation system can still generate electricity normally. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 FIG. 4 is a flow chart of the kinetic energy recovery device.

[0022] In the figure: 1. molten salt tank at the outlet of absorber; 2. hot salt downcomer of absorber; 401. inlet valve Ⅰ of power generation unit; 402. power generation unit Ⅰ; 403. emergency pipeline Ⅰ; 404. emergency pipeline switching valve Ⅰ; 405. emergency pipeline pressure reducing valve Ⅰ; 3. hot molten salt storage tank; 501. inlet valve Ⅱ of power generation unit; 502. power generation unit Ⅱ; 503. emergency pipeline Ⅱ; 504. emergency pipeline switching valve Ⅱ; 505. emergency pipeline pressure reducing valve Ⅱ; 601. expansion joint Ⅰ; 602. expansion joint Ⅱ; 603. expansion joint Ⅲ. DETAILED DESCRIPTION

[0023] Specific implementation method 1: See Figure 1 As shown, a kinetic energy recovery device for a hot salt downcomer of a tower molten salt heat absorber, this embodiment comprises a molten salt tank 1 at a heat absorber outlet, a hot salt downcomer 2 of a heat absorber and a hot molten salt storage tank 3;

[0024] The outlet of the heat absorber outlet molten salt tank 1 is connected to the inlet of the hot molten salt storage tank 3 through the heat absorber hot salt downcomer 2. The heat absorber hot salt downcomer 2 is adjacently provided with a power generation device inlet valve Ⅰ401 and a power generation device Ⅰ402 from top to bottom. The power generation device Ⅰ402 is used to convert the kinetic energy of the molten salt in the heat absorber hot salt downcomer 2 into electrical energy.

[0025] An emergency pipeline Ⅰ403 is provided on the absorber hot salt downcomer 2. The emergency pipeline Ⅰ403 is connected in parallel with the power generation device inlet valve Ⅰ401 and the power generation device Ⅰ402. The emergency pipeline Ⅰ403 is provided with an emergency pipeline switching valve Ⅰ404 and an emergency pipeline pressure reducing valve Ⅰ405 in sequence from top to bottom.

[0026] Further, the outlet of the heat absorber outlet molten salt tank 1 is connected to the inlet of the power generation device inlet valve Ⅰ401 through the heat absorber hot salt downcomer 2, the outlet of the power generation device inlet valve Ⅰ401 is connected to the inlet of the power generation device Ⅰ402 through the heat absorber hot salt downcomer 2, and the outlet of the power generation device Ⅰ402 is connected to the inlet of the hot molten salt storage tank 3 through the heat absorber hot salt downcomer 2. The heat absorber hot salt downcomer 2 between the heat absorber outlet molten salt tank 1 and the power generation device inlet valve Ⅰ401 is connected to the emergency pipeline Ⅰ403 through a three-way joint, the emergency pipeline Ⅰ403 is connected to the inlet of the emergency pipeline switching valve Ⅰ404, the outlet of the emergency pipeline switching valve Ⅰ404 is connected to the inlet of the emergency pipeline pressure reducing valve Ⅰ405 through the emergency pipeline Ⅰ403, and the outlet of the emergency pipeline pressure reducing valve Ⅰ405 is connected to the heat absorber hot salt downcomer 2 between the power generation device Ⅰ402 and the hot molten salt storage tank 3 through the emergency pipeline Ⅰ403 and the three-way joint.

[0027] Furthermore, the power generation device Ⅰ402 is used to convert the kinetic energy of the molten salt's descent into electrical energy to achieve kinetic energy recovery. The power generation device Ⅰ402 will reduce the speed of the molten salt's descent, replacing the heat absorber hot salt downcomer pressure reducing valve group, to reduce the pressure of the molten salt in the downcomer pipeline. When the power generation device Ⅰ402 fails, the power generation device inlet valve Ⅰ401 is closed, the emergency pipeline switching valve Ⅰ404 is opened, the molten salt is introduced into the emergency pipeline Ⅰ403, and the molten salt is decompressed through the emergency pipeline pressure reducing valve Ⅰ405 in the emergency pipeline Ⅰ403. The emergency pipeline Ⅰ403 is used to transfer the molten salt in the heat absorber hot salt downcomer 2 to the emergency pipeline Ⅰ403 for transportation when the power generation device Ⅰ402 fails, to ensure that the molten salt can be transported downward normally, and to prevent the downcomer from being over-pressured due to the blockage of the molten salt, resulting in rupture.

[0028] Specific implementation method 2: See Figure 1 As shown, the heat absorber hot salt downcomer 2 of this embodiment is provided with a power generation device inlet valve II501 and a power generation device II502 adjacent to each other from top to bottom, and the power generation device II502 is used to convert the kinetic energy of the molten salt in the heat absorber hot salt downcomer 2 into electrical energy;

[0029] An emergency pipeline II503 is provided on the absorber hot salt downcomer 2. The emergency pipeline II503 is connected in parallel with the power generation device inlet valve II501 and the power generation device II502. An emergency pipeline switching valve II504 and an emergency pipeline pressure reducing valve II505 are sequentially provided in the emergency pipeline II503 from top to bottom.

[0030] Further, the outlet of the power generation device I402 is connected to the inlet of the power generation device inlet valve II501 through the absorber hot salt downcomer 2, the outlet of the power generation device inlet valve II501 is connected to the inlet of the power generation device II502 through the absorber hot salt downcomer 2, and the outlet of the power generation device II502 is connected to the inlet of the hot molten salt storage tank 3 through the absorber hot salt downcomer 2. The absorber hot salt downcomer 2 between the power generation device I402 and the power generation device inlet valve II501 is connected to the emergency pipeline II503 through a three-way joint, the emergency pipeline II503 is connected to the inlet of the emergency pipeline switching valve II504, the outlet of the emergency pipeline switching valve II504 is connected to the inlet of the emergency pipeline pressure reducing valve II505 through the emergency pipeline II503, and the emergency pipeline pressure reducing valve II505 is connected to the absorber hot salt downcomer 2 between the power generation device II502 and the hot molten salt storage tank 3 through the three-way joint and the emergency pipeline II503.

[0031] Furthermore, the two-stage speed reduction of molten salt is realized by setting power generation device I402 and power generation device II502. Both power generation device I402 and power generation device II502 are equipped with corresponding emergency bypasses. When a power generation device fails, the molten salt can be transported downward normally through the emergency pipeline, and at this time, the other power generation device can operate normally to complete the kinetic energy recovery of the molten salt. When a single power generation device fails, the molten salt kinetic energy power generation system can still generate electricity normally, and the molten salt transportation is smooth.

[0032] Specific implementation method three: see Figure 1 As shown, in this embodiment, an expansion joint I601 is provided in the heat absorber hot salt downcomer 2 located between the heat absorber outlet molten salt tank 1 and the power generation device inlet valve I401, an expansion joint II602 is provided on the heat absorber hot salt downcomer 2 located between the power generation device I402 and the power generation device inlet valve II501, and an expansion joint III603 is provided on the heat absorber hot salt downcomer 2 located between the power generation device II502 and the hot molten salt storage tank 3.

[0033] Furthermore, the expansion joints I 601, II 602 and III 603 are used to compensate for the axial deformation of the hot salt downcomer 2 of the heat absorber to avoid vibration of the molten salt downcomer.

[0034] Specific implementation method four: see Figure 1 As shown, the power generation device I 402 and the power generation device II 502 of this embodiment use a rotary molten salt generator.

[0035] Furthermore, setting up two-stage power generation of power generation device I 402 and power generation device II 502 can effectively reduce the pressure in the heat absorber hot salt downcomer 2, and prevent the power generation device I 402 and the power generation device II 502 from being unable to be selected due to excessive pressure in the power generation device I 402 and the power generation device II 502.

[0036] Specific implementation method five: see Figure 1 As shown, the absorber hot salt downcomer 2 connecting the absorber outlet molten salt tank 1 and the hot molten salt storage tank 3 of this embodiment is vertically arranged.

[0037] Furthermore, the vertical arrangement of the heat absorber hot salt downcomer 2 allows the molten salt to be naturally transported by gravity, thus preventing the residual molten salt in the pipeline from solidifying and freezing the pipeline after shutdown, thus affecting the operation of the system. In addition, this arrangement does not have a pipeline entering the front elbow of the generator, thus reducing pipeline vibration and energy loss, and achieving high energy utilization.

[0038] Specific implementation method six: see Figure 1 As shown, the power generation device inlet valve I401 and the power generation device I402 of this embodiment are arranged in the middle of the heat absorber hot salt downcomer 2, and the power generation device inlet valve II501 and the power generation device II502 are arranged at the bottom of the heat absorber hot salt downcomer 2.

[0039] Furthermore, in conjunction with implementation mode five, the power generation device II 502 is set at the bottom of the absorber hot salt downcomer 2 to achieve no horizontal interface with the hot molten salt storage tank 3, thereby avoiding stress caused by factors such as pipeline vibration, temperature change, and tank expansion that may tear the outer wall of the tank and cause accidents such as molten salt leakage.

[0040] Specific implementation method seven: See Figure 1 As shown, the power generation device inlet valve I401, the emergency pipeline switching valve I404, the power generation device inlet valve II501 and the emergency pipeline switching valve II504 of this embodiment adopt three-eccentric butterfly valves.

[0041] Specific implementation method eight: See Figure 1 As shown, the emergency pipeline pressure reducing valve I 405 and the emergency pipeline pressure reducing valve II 505 of this embodiment adopt single seat valves.

[0042] Specific implementation method nine: See Figure 1 As shown, the absorber outlet molten salt tank 1 of this embodiment is arranged at the top of the absorber tower with a height of 180-220m.

Claims

1. A kinetic energy recovery device for a hot salt downcomer of a tower molten salt heat absorber, characterized in that: It comprises a molten salt tank (1) at the outlet of a heat absorber, a hot salt downcomer (2) of the heat absorber and a hot molten salt storage tank (3); The outlet of the heat absorber outlet molten salt tank (1) is connected to the inlet of the hot molten salt storage tank (3) through the heat absorber hot salt downcomer (2), and the heat absorber hot salt downcomer (2) is adjacently provided with a power generation device inlet valve I (401) and a power generation device I (402) from top to bottom, and the power generation device I (402) is used to convert the kinetic energy of the molten salt in the heat absorber hot salt downcomer (2) into electrical energy; An emergency pipeline I (403) is arranged on the heat absorber hot salt downcomer (2). The emergency pipeline I (403) is connected in parallel with the power generation device inlet valve I (401) and the power generation device I (402). An emergency pipeline switching valve I (404) and an emergency pipeline pressure reducing valve I (405) are arranged in sequence from top to bottom in the emergency pipeline I (403).

2. The kinetic energy recovery device for the hot salt downcomer of a tower molten salt heat absorber according to claim 1, characterized in that: The heat absorber hot salt downcomer (2) is provided with a power generation device inlet valve II (501) and a power generation device II (502) adjacent to each other from top to bottom, and the power generation device II (502) is used to convert the kinetic energy of the molten salt in the heat absorber hot salt downcomer (2) into electrical energy; An emergency pipeline II (503) is arranged on the heat absorber hot salt downcomer (2), and the emergency pipeline II (503) is connected in parallel with the power generation device inlet valve II (501) and the power generation device II (502). An emergency pipeline switching valve II (504) and an emergency pipeline pressure reducing valve II (505) are arranged in sequence from top to bottom in the emergency pipeline II (503).

3. The kinetic energy recovery device for the hot salt downcomer of a tower molten salt heat absorber according to claim 2, characterized in that: An expansion joint I (601) is provided in the heat absorber hot salt downcomer (2) between the heat absorber outlet molten salt tank (1) and the power generation device inlet valve I (401), an expansion joint II (602) is provided on the heat absorber hot salt downcomer (2) between the power generation device I (402) and the power generation device inlet valve II (501), and an expansion joint III (603) is provided on the heat absorber hot salt downcomer (2) between the power generation device II (502) and the hot molten salt storage tank (3).

4. The kinetic energy recovery device for the hot salt downcomer of a tower molten salt heat absorber according to claim 3, characterized in that: The power generation device I (402) and the power generation device II (502) adopt a rotary molten salt generator.

5. The kinetic energy recovery device for the hot salt downcomer of a tower molten salt heat absorber according to claim 1, characterized in that: The heat absorber hot salt downcomer (2) connecting the heat absorber outlet molten salt tank (1) and the hot molten salt storage tank (3) is arranged vertically.

6. The kinetic energy recovery device for the hot salt downcomer of a tower molten salt heat absorber according to claim 5, characterized in that: The power generation device inlet valve I (401) and the power generation device I (402) are arranged in the middle of the heat absorber hot salt downcomer (2), and the power generation device inlet valve II (501) and the power generation device II (502) are arranged at the bottom of the heat absorber hot salt downcomer (2).

7. The kinetic energy recovery device for the hot salt downcomer of a tower molten salt heat absorber according to claim 6, characterized in that: The power generation device inlet valve I (401), the emergency pipeline switching valve I (404), the power generation device inlet valve II (501) and the emergency pipeline switching valve II (504) are triple eccentric butterfly valves.

8. The kinetic energy recovery device for the hot salt downcomer of a tower molten salt heat absorber according to claim 6, characterized in that: The emergency pipeline pressure reducing valve I (405) and the emergency pipeline pressure reducing valve II (505) are single seat valves.

9. The kinetic energy recovery device for the hot salt downcomer of a tower molten salt heat absorber according to claim 1, characterized in that: The absorber outlet molten salt tank (1) is arranged at the top of a heat absorption tower with a height of 180-220 m.

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