CN111609570B - An open volumetric highly integrated ground solar collector system - Google Patents

Abstract

The present invention relates to an open volumetric high-integration ground heat collection system, comprising a heat collection component, a special-shaped buffer tank, a floating baffle and a submerged molten salt pump. The heat collection component is an open volumetric structure, located at the upper part of the special-shaped buffer tank, and a heat insulation material is provided between the bottom and the special-shaped buffer tank. An inlet channel of the molten salt inlet is provided in the heat insulation material on one side of the heat collection component, and the channel is connected to the heat collection component inlet. A connecting pipe is provided at the lower end of the heat collection component inlet, which is connected to the lower space of the special-shaped buffer tank through the connecting pipe; a floating baffle is provided in the middle position of the special-shaped buffer tank, and the floating baffle is limited by providing a retaining ring on the floating baffle and a retaining ring under the floating baffle on the inner surface of the special-shaped buffer tank. The present invention integrates multiple dispersed devices into a highly integrated single system close to a single device, which can effectively save costs, reduce floor space, and enhance system stability. Correspondingly, the process flow and control scheme are simplified, resulting in a reduction in construction and operation and maintenance costs.

Description

An open volumetric highly integrated ground solar collector system

Technical Field

The invention relates to an open volumetric high-integration ground heat collection system, belonging to the technical field of photothermal power generation.

Background Art

The secondary reflection tower is significantly different from other tower technologies. The secondary reflection tower can reflect the light energy collected by the mirror field to the ground, and the heat collection system can be set up on the ground. Compared with the conventional tower, the technical difficulty of setting up the heat collection system on the top of the nearly 200-meter tower is reduced. Whether in terms of design, construction or operation and maintenance, the advantages of setting up the heat collection system on the ground are quite obvious: the heat collection components can be volumetric, with a large heat capacity, which can effectively avoid the overheating of the molten salt caused by the fluctuation of light energy input; the buffer tank can be designed with a special shape, with a large dynamic buffering capacity, providing a friendly relaxation time for the cut-in/cut-out of each working condition; the molten salt pump can adopt a low head, reducing the power consumption of the plant; the construction also greatly reduces the difficulty of equipment hoisting, and the difficulty of civil engineering structure is also reduced accordingly. The reduction in construction difficulty also affects the reduction of installation costs at the same time; in terms of operation and maintenance, high-altitude operations such as equipment and instruments are bound to be less efficient on the ground. With these technical advantages, the idea of system assembly is adopted to design the various components of the solar collector system in an intensive manner, making it a highly integrated single system close to a single device, which can effectively save costs, reduce floor space and enhance system stability.

Summary of the invention

The purpose of the present invention is to provide an open volumetric highly integrated ground solar collector system, in view of the fact that the components of the current ground solar collector system are too dispersed and cannot fully meet the needs of intensive development. By systematically integrating and optimizing the appearance and functions of the three main components of the solar collector components, special-shaped buffer tanks, and molten salt pumps, the purpose of intensive, compact and integrated assembly is achieved, becoming a highly integrated single system close to a single device, which can effectively save costs, reduce space occupation, and enhance system stability.

The technical solution adopted by the present invention is: an open volumetric high-integration ground solar collector system, including a solar collector component, a special-shaped buffer tank, a floating baffle, a connecting pipe and a submerged molten salt pump, wherein the solar collector component is an upper open structure, which is located in the upper part of the special-shaped buffer tank, and an insulating material is provided between the bottom of the solar collector component and the special-shaped buffer tank, and an inlet channel for the molten salt inlet is provided in the insulating material on one side of the solar collector component, and the inlet channel is connected to the solar collector component inlet at the lower end of the solar collector component, and a connecting pipe is provided at the lower end of the solar collector component inlet, through which the connecting pipe and the lower space of the special-shaped buffer tank are connected. Unicom; a floating baffle is provided in the middle of the special-shaped buffer tank, and the floating baffle is limited by a retaining ring on the inner surface of the special-shaped buffer tank and a lower retaining ring on the floating baffle provided at the bottom of the connecting pipe; the lower space is subjected to the downward pressure of the floating baffle and the molten salt in the upper space, as well as the system molten salt inlet pressure, and always maintains low positive pressure operation; the upper end of the heat collecting component is provided with a heat collecting component outlet, which is connected to the upper space of the special-shaped buffer tank through the heat collecting component outlet; the upper space of the special-shaped buffer tank is provided with a breathing port, and the upper space is connected to the atmosphere through the breathing port, and always maintains normal pressure operation;

The molten salt inlet outside the inlet channel in the thermal insulation material is connected to the outlet of the central cold pump outside the heat collection system through an intermediate cold salt delivery pipeline, and the inlet flow is adjusted by a control loop composed of a heat collection component inlet flow meter, a heat collection component inlet flow regulating valve, and a buffer tank lower pressure gauge, and the pressure in the special-shaped buffer tank is maintained stable;

The outlet of the submersible molten salt pump is connected to the inlet of the central hot tank and the central cold tank outside the solar collector system through an intermediate hot salt delivery pipeline, and the outlet flow is regulated by a control loop composed of a submersible molten salt pump outlet flow meter, a submersible molten salt pump outlet regulating valve, and a pressure gauge on the upper part of the buffer tank.

In the present invention, a high liquid level emergency outlet of the heat collecting component is arranged at the upper end of the heat collecting component, and the high liquid level emergency outlet of the heat collecting component is used to make the heat collecting component overflow automatically when the high liquid level is reached.

In the present invention: a heat collecting component drain valve is provided between the upper space and the lower space of the special-shaped buffer tank, and the heat collecting component is drained through the heat collecting component drain valve to achieve a stable heat preservation operation state.

In the present invention, an anti-condensation electric heater is arranged at the lower part of the special-shaped buffer tank, and the anti-condensation target temperature is set, and the start and stop of the electric heating is controlled by a temperature signal to ensure that the molten salt temperature is not lower than 280°C.

In the present invention: a certain thickness of insulation material is laid on the outer side of the wall of the special-shaped buffer tank, and an insulation foundation is provided at the bottom. The insulation foundation is used to keep the special-shaped buffer tank isolated from the ground. The insulation material and the insulation foundation can effectively reduce the heat dissipation of the solar collection system and ensure the operating efficiency of the system. The insulation foundation also avoids the adverse effect of 300°C molten salt at the bottom of the tank on the bearing capacity of the natural ground.

In the present invention: a movable insulation cover is arranged above the opening of the heat collecting component, the movable insulation cover is divided into two halves, and can be opened and closed from the center to both sides through racks, each half of the movable insulation cover is equipped with three rollers, which move on three sliding rails respectively, and the sliding rails are supported by the supporting structures at the bottom of both sides.

In the present invention, a vertical transmission shaft is arranged on the rack, the rack is meshed with the transmission shaft upper gear at one end of the vertical transmission shaft, a transmission shaft lower gear is arranged at the other end of the transmission shaft, and the motor is driven by a motor, and the motor is placed on the ground for easy maintenance.

In the present invention, one end of the rack is connected to the outer side of the movable heat-insulating cover by welding or fastening bolts, so that the rack and the movable heat-insulating cover are integrated.

Beneficial effects of the present invention:

1. The present invention has a simple structure and reasonable design. It integrates multiple scattered devices into a highly integrated single system close to a single device, which can effectively save costs, reduce floor space, and enhance system stability. Correspondingly, the process flow and control scheme are simplified, resulting in a reduction in construction and operation and maintenance costs;

2. The central cold pump outside the solar collector system can be directly used as power. Compared with the conventional one-tank-one-pump configuration, it can save one molten salt pump and reduce system costs;

3. The design of special-shaped buffer tank is adopted to merge the cold and hot buffer tanks, which reduces the auxiliary components such as pipeline valves connecting equipment and tanks, reduces the cost of equipment and pipelines, and improves the stability of the system;

4. As there is a floating baffle in the special-shaped buffer tank, when the heat collector is running, the floating baffle rises and is blocked by the retaining ring on the buffer tank, forming a stable hot salt buffer zone on the upper part of the buffer tank. The submersible molten salt pump only needs a conventional shaft length (3 to 4 meters) to meet the operating requirements, reducing the difficulty of submersible molten salt selection and equipment cost;

5. Due to the use of special-shaped buffer tanks, under the regulation of the flow control loop in the system, a larger dynamic buffering capacity for the system's cold salt input/hot salt output can be achieved, providing a friendly relaxation time for the cut-in/cut-out of each working condition;

6. Multiple pressure gauges are set up in the system, which can monitor the system pressure characteristics and indirectly measure the liquid level, simplifying the sensor configuration of the control loop;

7. When a movable insulation cover is installed above the opening of the solar collector, it can insulate against rain and dust. When it is in low-speed heat preservation operation, the solar collector can operate with salt, and the heat loss is close to that after the solar collector is emptied, which effectively shortens the system startup/shutdown time.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a schematic diagram of a system of the present invention;

FIG2 is a schematic top view of the present invention;

FIG3 is a schematic diagram of the heat preservation operation condition of the present invention;

FIG. 4 is a schematic diagram of the heat preservation operation condition of the heat collecting component of the present invention after being emptied.

In the figure: 1. Heat collecting component; 1-A. Heat collecting component inlet; 1-B. Heat collecting component outlet; 1-C. Heat collecting component high liquid level emergency outlet; 1-D. Heat collecting component inlet flow meter; 1-E. Heat collecting component inlet flow regulating valve; 2. Heat insulation material; 3. Special-shaped buffer tank; 3-A. Floating baffle upper retaining ring; 3-B. Floating baffle; 3-C. Connecting pipe; 3-D. Floating baffle lower retaining ring; 3-E. Breathing port; 3-F. Heat collecting component drain valve; 3-H. Buffer tank upper pressure gauge; 3-I. Buffer tank lower pressure gauge; 4. Submerged molten salt pump; 4-A. Submerged molten salt pump outlet regulating valve; 4-B. Flow meter at the outlet of submerged molten salt pump; 5. Electric heater; 6. Insulation foundation; 7. Movable insulation cover; 7-A. Rack; 7-B. Gear on the transmission shaft; 7-C. Guide rail; 7-D. Roller; 7-E. Transmission shaft; 7-F. Gear under the transmission shaft; 7-G. Motor; 7-H. Support structure; CP. Central cold pump outside the solar collector system; CT. Central cold tank outside the solar collector system; HT. Central hot tank outside the solar collector system.

DETAILED DESCRIPTION

The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

As shown in Fig. 1-4, an open volumetric high-integration ground solar collector system comprises a solar collector component 1, a special-shaped buffer tank 3, a floating baffle 3-B, a connecting pipe 3-C and a submerged molten salt pump 4, wherein the solar collector component 1 is an upper open structure, which is located in the upper part of the special-shaped buffer tank 3, and an insulating material 2 is provided between the bottom of the solar collector component 1 and the special-shaped buffer tank 3, and an inlet channel for the molten salt inlet is provided in the insulating material on one side of the solar collector component 1, and the inlet channel is connected to the solar collector component inlet 1-A at the lower end of the solar collector component 1, and a connecting pipe 3-C is provided at the lower end of the solar collector component inlet 1-A, which is connected to the lower space of the special-shaped buffer tank (3) through the connecting pipe 3-C; A floating baffle 3-B is provided in the middle of the special-shaped buffer tank 3, and the floating baffle 3-B is limited by a floating baffle upper retaining ring 3-A provided on the inner surface of the special-shaped buffer tank 3 and a floating baffle lower retaining ring 3-D provided at the bottom of the connecting pipe 3-C; the lower space is subjected to the downward pressure of the floating baffle 3-B and the molten salt in the upper space, as well as the system molten salt inlet pressure, and always maintains low positive pressure operation; the upper end of the heat collecting component 1 is provided with a heat collecting component outlet 1-B, which is connected to the upper space of the special-shaped buffer tank 3 through the heat collecting component outlet 1-B; the upper space of the special-shaped buffer tank 3 is provided with a breathing port 3-E, and the upper space is connected to the atmosphere through the breathing port 3-E, and always maintains normal pressure operation;

The molten salt inlet outside the inlet channel in the thermal insulation material 2 is connected to the outlet of the central cold pump CP outside the heat collection system through the intermediate cold salt delivery pipeline, and the inlet flow is adjusted by the control loop composed of the heat collection component inlet flow meter 1-D, the heat collection component inlet flow regulating valve 1-E, and the buffer tank lower pressure gauge 3-I, and the stability of the pressure in the special-shaped buffer tank is maintained; the submerged molten salt pump 4 is connected to the inlet of the central hot tank HT and the central cold tank CT outside the heat collection system through the molten salt outlet through the intermediate hot salt delivery pipeline, and the outlet flow is adjusted by the control loop composed of the submerged molten salt pump outlet flow meter 4-B, the submerged molten salt pump outlet regulating valve 4-A, and the buffer tank upper pressure gauge 3-H. The submerged molten salt pump 4 has a frequency conversion function, which roughly adjusts the system outlet flow, and then the submerged molten salt pump outlet flow meter 4-B, the submerged molten salt pump outlet regulating valve 4-A, and the buffer tank upper pressure gauge 3-H fine-tune the outlet flow. In general, the system inlet/outlet flow regulation cooperates with each other to maintain dynamic balance to meet the safe and stable operation under various working conditions.

The upper end of the heat collecting component 1 is provided with a heat collecting component high liquid level emergency outlet 1-C, through which the heat collecting component high liquid level emergency outlet 1-C allows the heat collecting component 1 to overflow automatically when it reaches a high liquid level. A heat collecting component drain valve 3-F is provided between the upper space and the lower space of the special-shaped buffer tank 3, through which the heat collecting component is drained and the heat preservation operation is stable. An anti-condensation electric heater 5 is provided at the lower part of the special-shaped buffer tank 3. By setting the anti-condensation target temperature, the electric heating start and stop are controlled by the temperature signal to ensure that the molten salt temperature is not lower than 280°C. A certain thickness of insulation material is laid on the outer side of the wall of the special-shaped buffer tank 3, and an insulation foundation 6 is provided at the bottom. The insulation foundation 6 keeps the special-shaped buffer tank 3 isolated from the ground. The insulation material and the insulation foundation can effectively reduce the heat dissipation of the heat collecting system and ensure the system operation efficiency. The insulation foundation also avoids the adverse effect of the 300°C molten salt at the bottom of the tank on the bearing capacity of the natural ground. A movable heat-insulating cover 7 is arranged above the opening of the heat-collecting component 1. The movable heat-insulating cover 7 is divided into two halves, which can be opened and closed from the center to both sides through a rack 7-A. Three rollers 7-D are installed on each half of the movable heat-insulating cover 7, which move on three sliding guide rails 7-C respectively. The sliding guide rails 7-C are supported by support structures 7-H below both sides, and the support structure 7-H adopts a conventional steel structure. A vertical transmission shaft 7-E is arranged on the rack 7-A, and the rack 7-A is meshed with a transmission shaft upper gear 7-B at one end of the vertical transmission shaft 7-E. A transmission shaft lower gear 7-F is arranged at the other end of the transmission shaft 7-E and driven by a motor 7-G. The motor 7-G is placed on the ground for easy maintenance. One end of the rack 7-A is connected to the outer side of the movable heat-insulating cover 7 by welding or fastening bolts, so that the rack 7-A and the movable heat-insulating cover 7 are integrated.

The operating conditions of the heat collection system of the present invention are generally divided into two types: heat collection conditions and non-heat collection conditions. The heat collection conditions include: on/off process, heat collection stable operation state, cloud condition (cloud cut-in/cut-out); the non-heat collection condition is the low-speed heat preservation operation state after the heat collection shutdown process. Regardless of the configuration of the heat collection system, it should meet the above conditions.

The present invention adopts a special-shaped buffer tank 3 as a buffer container. A floating partition 3-B is arranged in the middle of the special-shaped buffer tank 3. The density of the floating partition 3-B is between that of high-temperature (570°C) and low-temperature (300°C) molten salt. It should also have good thermal insulation ability to reduce the heat transfer of the molten salt on both sides of the partition and ensure the quality of the high-temperature molten salt. The floating partition 3-B divides the special-shaped buffer tank 3 into an upper and lower space. The upper space is connected to the atmosphere through the breathing port 3-E and always maintains normal pressure operation. The lower space is subjected to the downward pressure of the floating partition 3-B and the molten salt in the upper space, as well as the system molten salt inlet pressure, and always maintains low positive pressure operation. In the solar collector working condition, the upper space of the special-shaped buffer tank 3 is the hot salt buffer zone (570℃), and the lower space is the cold salt buffer zone (300℃). In the non-solar collector working condition, the upper space of the special-shaped buffer tank 3 is the thermal insulation operation zone (300~400℃), and the lower space is the cold salt retention zone (300℃). The floating baffle 3-B dynamically adjusts the working position according to the operating capacity of the molten salt in each working condition, and the corresponding safety volume of each functional area must be guaranteed. For this purpose, a retaining ring 3-A on the floating baffle and a lower retaining ring 3-D on the floating baffle are provided, and a DCS pressure alarm is set through the upper pressure gauge 3-H and the lower pressure gauge 3-I of the buffer tank to prevent the functional area from failing.

In the present invention, the heat collecting component inlet 1-A is directly connected with the system molten salt inlet and the lower space of the special-shaped buffer tank 3 through the connecting pipe 3-C. Therefore, the heat collecting component 1 and the functional areas of the special-shaped buffer tank 3 are connected with the atmosphere. The open volumetric heat collecting component 1 has a deeper molten salt cavity. The molten salt enters from the bottom and exits from the top. After the light energy penetrates into the molten salt, it is absorbed layer by layer by the rising molten salt. The light energy gradually decays accordingly. Finally, the top molten salt outlet collects high-temperature molten salt (570°C), and the high-temperature molten salt enters the hot salt buffer zone at the top of the special-shaped buffer tank 3; the heat collecting component outlet 1-B is connected with the upper space of the special-shaped buffer tank 3.

As shown in Figure 1, when switching from a non-heat-collecting condition to a heat-collecting condition, the operator issues a system startup command, the movable insulation cover 7 opens, and the system inlet flow regulating loop adjusts the inlet flow to the set value of the heat-collecting condition. Since the molten salt in the heat-collecting component does not need to be emptied, light energy can be directly input, shortening the startup preheating process. The molten salt at 300-400°C is gradually heated to 570°C. During the heating process, the volume of the cold/hot salt buffer zone in the buffer tank is slowly adjusted through the system inlet/outlet flow control loop. When the hot salt buffer zone obtains a stable molten salt at 570°C, the submersible molten salt pump 4 outputs the 570°C molten salt from the system, and finally sends it to the central hot tank HT outside the heat-collecting system, thus achieving a stable heat-collecting operation state. When temporary clouds appear over the power plant, causing the solar energy input to decrease or fluctuate in a step-by-step manner, the solar collector system automatically switches to the cloud condition, and uses the large volume characteristics of the open volume type to increase the flow regulation frequency of the system inlet/outlet flow control loop as the solar energy input changes, with the output of 570°C molten salt as the benchmark, allowing ±20°C output temperature fluctuations and certain solar collector component liquid level fluctuations. After the cloud condition disappears, it automatically switches out, reduces the flow regulation frequency and stabilizes the liquid level. When the solar collector reaches a high liquid level, it will automatically overflow from the solar collector high liquid level emergency outlet 1-C and trigger an alarm, and the operator is required to manually intervene in the flow regulation.

As shown in FIG3 , when switching from the heat collection working condition to the non-heat collection working condition, the operator issues a system shutdown command, stops the light energy input, closes the movable heat insulation cover 7, and the system inlet flow regulating loop adjusts the outlet flow to the non-heat collection working condition set value after a certain delay according to the liquid level of the hot salt buffer zone to ensure sufficient output of 570°C hot salt. The molten salt in the heat collection component does not need to be emptied, thereby shortening the shutdown time. The 300°C molten salt is still continuously fed into the system, and the 570°C molten salt is gradually fed out of the system by the submersible pump 4 . The volume of the buffer tank insulation operation area and the cold salt retention area is slowly adjusted through the system inlet/outlet flow control loop, and the 570°C molten salt in the hot salt buffer zone is gradually replaced with 300-400°C molten salt. The submersible molten salt outputs the 300-400°C molten salt from the system and finally is fed to the central cold tank CT outside the heat collection system, thus reaching a stable insulation operation state.

As shown in Figure 4, when the system is in heat preservation operation by emptying, the shutdown process is similar to that without emptying. The difference is that two operations are added: opening the emptying valve 3-F of the heat collecting component and temporarily increasing the system outlet flow. The emptying principle uses the insulation operation area and the cold salt retention area to connect to the atmosphere. When the emptying valve 3-F of the heat collecting component is opened, the two functional areas are also interconnected. Because the cold salt retention area and the heat collecting component are interconnected through the connecting pipe 3-C, the molten salt level in the heat collecting component 1 will slowly decrease, and the molten salt enters the insulation operation area through the heat collecting component emptying valve 3-F. The liquid level in the insulation operation area will have an upward trend. At this time, slowly increase the system outlet flow to maintain the liquid level in the insulation operation area. When the liquid level of the heat collecting component drops completely, restore the system inlet/outlet flow balance, complete the emptying of the heat collecting component 1, and reach a stable state of insulation operation.

The above describes the specific embodiments of the present invention, but the present invention is not limited to the above description. For those skilled in the art, any equivalent modification and substitution of the technical solution is within the scope of the present invention. Therefore, the equalization and modification made without departing from the spirit and scope of the present invention should be included in the scope of the present invention.

Claims (5)

1. An open positive displacement high integration ground heat collection system which is characterized in that: the heat collection device comprises a heat collection part (1), a special-shaped buffer tank (3), a floating baffle plate (3-B), a communicating pipe (3-C) and a submerged molten salt pump (4), wherein the heat collection part (1) is of an upper end opening type structure, the heat collection part is positioned at the upper part of the special-shaped buffer tank (3), a heat insulation material (2) is arranged between the bottom of the heat collection part (1) and the special-shaped buffer tank (3), an inlet channel of a molten salt inlet is arranged in the heat insulation material at one side of the heat collection part (1), the inlet channel is communicated with a heat collection part inlet (1-A) at the lower end of the heat collection part (1), and meanwhile, the lower end of the heat collection part inlet (1-A) is provided with the communicating pipe (3-C) which is communicated with the lower space of the special-shaped buffer tank (3) through the communicating pipe (3-C); the middle part of the special-shaped buffer tank (3) is provided with a floating baffle plate (3-B), and the floating baffle plate (3-B) is limited by arranging a floating baffle plate upper check ring (3-A) on the inner surface of the special-shaped buffer tank (3) and a floating baffle plate lower check ring (3-D) arranged at the bottom of the communicating pipe (3-C); the lower space bears the downward pressure of the floating partition plate (3-B) and molten salt in the upper space and the inlet pressure of the molten salt in the system, so that the low positive pressure operation is always kept; the upper end of the heat collecting component (1) is provided with a heat collecting component outlet (1-B), and the heat collecting component outlet (1-B) is communicated with the upper space of the special-shaped buffer tank (3); the upper space of the special-shaped buffer tank (3) is provided with a breathing port (3-E), and the upper space is connected with the atmosphere through the breathing port (3-E) and always keeps normal pressure operation;

The molten salt inlet outside the inlet channel in the heat insulation material (2) is connected with the outlet of the central Cold Pump (CP) outside the heat collection system through a middle cold salt conveying pipeline, and the inlet flow is regulated through a control loop consisting of a heat collection part inlet flowmeter (1-D), a heat collection part inlet flow regulating valve (1-E) and a buffer tank lower pressure gauge (3-I), so that the pressure in the special-shaped buffer tank is kept stable;

the submerged molten salt pump (4) is respectively connected with an external central Hot Tank (HT) and an external central Cold Tank (CT) of the heat collecting system through a molten salt outlet through a middle hot salt conveying pipeline, and the outlet flow is regulated through a control loop consisting of a submerged molten salt pump outlet flowmeter (4-B), a submerged molten salt pump outlet regulating valve (4-A) and a pressure gauge (3-H) at the upper part of the buffer tank;

A movable heat insulation cover (7) is arranged above the opening of the heat collection component (1), the movable heat insulation cover (7) is divided into two halves, the movable heat insulation cover (7) can be opened and closed from the center to two sides through racks (7-A), three rollers (7-D) are arranged on the movable heat insulation cover (7) of each half, the movable heat insulation cover rolls on three guide rails (7-C) respectively, and the guide rails (7-C) are supported through supporting structures (7-H) below two sides;

The vertical transmission shaft (7-E) is arranged on the rack (7-A), the rack (7-A) is meshed with a transmission shaft upper gear (7-B) at one end of the vertical transmission shaft (7-E), a transmission shaft lower gear (7-F) is arranged at the other end of the transmission shaft (7-E), and the rack is driven by a motor (7-G), and the motor (7-G) is arranged on the ground, so that the maintenance is convenient;

One end of the rack (7-A) is connected with the outer side of the movable heat insulation cover (7) through welding or fastening bolts, so that the rack (7-A) and the movable heat insulation cover (7) are integrated.

2. An open volumetric high integration ground heat collection system according to claim 1, wherein: the upper end of the heat collecting component (1) is provided with a heat collecting component high liquid level emergency outlet (1-C), and the heat collecting component (1) automatically overflows when reaching high liquid level through the heat collecting component high liquid level emergency outlet (1-C).

3. An open volumetric high integration ground heat collection system according to claim 1, wherein: and a heat collecting part emptying valve (3-F) is arranged between the upper space and the lower space of the special-shaped buffer tank (3), and the heat collecting part is emptied through the heat collecting part emptying valve (3-F) and reaches a heat preservation running stable state.

4. An open volumetric high integration ground heat collection system according to claim 1, wherein: the lower part of the special-shaped buffer tank (3) is provided with an anti-condensation electric heater (5), and the electric heating start and stop are controlled by a temperature signal through setting an anti-condensation target temperature, so that the temperature of molten salt is ensured not to be lower than 280 ℃.

5. An open volumetric high integration ground heat collection system according to claim 1, wherein: the heat insulation material with certain thickness is laid on the outer side of the wall surface of the special-shaped buffer tank (3), the heat insulation foundation (6) is arranged at the bottom of the special-shaped buffer tank, the special-shaped buffer tank (3) is kept isolated from the ground through the heat insulation foundation (6), the heat insulation material and the heat insulation foundation can effectively reduce heat dissipation of a heat collection system, the running efficiency of the system is guaranteed, and adverse effects of molten salt at 300 ℃ on the natural ground bearing capacity of the tank bottom are avoided by the heat insulation foundation.