High-temperature solid particle storage tank for photo-thermal power generation

Abstract

The application discloses a high-temperature solid particle storage tank for photo-thermal power generation, which comprises a tank body, a main feeding pipe (7) arranged at the upper portion of the tank body in the vertical direction, and a plurality of sub-feeding pipes (9) respectively communicated with the outlet of the main feeding pipe (7) and respectively extended into the tank body. The outlet of the sub-feeding pipe (9) is provided with a flow guide module (10), the outlet of the tank body is communicated with the inlet of a discharging pipe (12), and each emergency outlet is respectively communicated with the inlet of an emergency discharging pipe (13). The high-temperature solid particle storage tank for photo-thermal power generation can effectively reduce the erosion and abrasion of solid particles to the storage tank, relieve the influence of thermal expansion force on the storage tank, reduce or avoid possible safety accidents of the equipment, has good energy storage and heat preservation effect, small heat loss and long service life.

Description

Technical Field

[0001] This invention relates to the field of solar thermal power generation, and more specifically to a high-temperature solid particle storage tank for solar thermal power generation. Background Technology

[0002] To achieve the "dual carbon" goal, the installed capacity of new energy power generation methods such as solar and wind power is constantly increasing. However, due to the generally fluctuating and intermittent characteristics of new energy power and the lack of controllability, the problem of its consumption is becoming increasingly prominent. Concentrated solar power (CSP), with its built-in energy storage system, effectively reduces carbon emissions while its output power is controllable, thus attracting increasing attention. Currently, CSP commonly uses molten salt as the heat storage medium. Due to its high cost and limited maximum storage temperature, the power generation efficiency is relatively low, resulting in a high cost per kilowatt-hour. Using relatively inexpensive solid particles, whose maximum usable temperature is significantly higher than molten salt, as the heat storage and exchange medium for CSP can effectively reduce system costs while improving system power generation efficiency. Based on this, authoritative institutions predict that solid particle thermal storage CSP will become the mainstream form of next-generation CSP. However, high-flow-rate, high-particle-concentration high-temperature solid particles have a strong erosive and abrasive effect on storage tanks during use, and are prone to leakage under long-term operation. In addition, to cope with the high-temperature conditions of solid particles exceeding 700°C, expensive metal materials are required to manufacture the steel structure of the storage tank, which will significantly increase the manufacturing cost of the storage tank. Summary of the Invention

[0003] The purpose of this invention is to provide a high-temperature solid particle storage tank for solar thermal power generation that can effectively reduce the erosion and wear of the storage tank by solid particles, alleviate the impact of thermal expansion force on the storage tank, reduce or avoid potential safety accidents of the equipment, and has good energy storage and heat preservation effect, low heat loss and long service life.

[0004] The present invention provides a high-temperature solid particle storage tank for solar thermal power generation, comprising a tank body, a main feed pipe provided vertically above the tank body, the outlet of the main feed pipe being located at the bottom of the main feed pipe, the outlet of the main feed pipe being connected to the inlets of multiple branch feed pipes, the multiple branch feed pipes extending downward into the tank body, a flow guiding module being provided below the outlet of the multiple branch feed pipes, the solid particles flowing out of the outlet of the branch feed pipes will first touch the upward-facing, sloping surface of the flow guiding module during the falling process, and then continue to fall to the lower part of the tank body;

[0005] The lower part of the tank body is provided with a grid, and the bottom of the tank body is provided with a discharge port and one or more emergency discharge ports. The discharge port at the bottom of the tank body is connected to the inlet of the discharge pipe, and each emergency discharge port is connected to the inlet of an emergency discharge pipe.

[0006] The tank body includes a metal shell made of steel. The inner surface of the metal shell is covered with an inner insulation layer. The exposed surface of the inner insulation layer is provided with a wear-resistant and fire-resistant layer. The sides and top of the outer surface of the metal shell are provided with an outer insulation layer. There is a reserved gap of not less than 3mm between the outer surface of the metal shell and the outer insulation layer to prevent the outer insulation layer from being damaged due to the expansion of the metal shell. A steel structure frame for fixing the outer insulation layer and the metal shell is embedded in the outer insulation layer. A sand pad layer is provided at the bottom of the metal shell. A pressure-resistant insulation layer is provided at the bottom of the sand pad layer. The outer surface of the outer insulation layer, the outer side of the sand pad layer, the outer side of the pressure-resistant insulation layer, and the bottom are covered with a skin layer.

[0007] Preferably, a 5mm to 10mm gap is provided between the outer surface of the metal shell and the outer insulation layer, and an electrically controlled slide valve is connected in series on the main feed pipe, the discharge pipe and each emergency discharge pipe.

[0008] Preferably, the number of feed pipes is 3 to 8, the number of flow guiding modules is 3 to 8, and the number of emergency discharge pipes is 2 to 6.

[0009] Preferably, the cross-section of the flow guiding module along the vertical direction is triangular or right trapezoidal, the angle between the inclined surface of the flow guiding module and the horizontal plane is 20° to 60°, and the flow guiding module is made of heat-resistant alloy steel.

[0010] Preferably, the outlet of the emergency unloading pipe is connected to the storage ditch outside the storage tank.

[0011] Preferably, the sand pad layer is composed of quartz particles or ceramic particles, and the wear-resistant and fire-resistant layer is composed of ceramic coating. The ceramic coating is sprayed onto the inner insulation layer by supersonic flame spraying or plasma spraying.

[0012] Preferably, the cross-section of the tank is circular, and the tank is equipped with a temperature measuring device for measuring the temperature of solid particles inside the tank.

[0013] Preferably, the filling cavity of the tank is provided with 8 to 20 temperature measuring points.

[0014] In use, the high-temperature solid particle storage tank for solar thermal power generation of the present invention allows high-temperature solid particles to enter the tank body through multiple feed pipes and first contact the corresponding flow guiding module. This avoids direct erosion of the inner wall of the tank by the high-temperature solid particles and reduces the flow velocity of the high-temperature solid particles, thereby mitigating the erosive effect of the high-temperature solid particles on the bottom of the tank. Since the tank body includes a metal shell made of steel, the inner surface of the metal shell is covered with an inner insulation layer, the outer surface of the metal shell has an outer insulation layer on the sides and top, the bottom of the metal shell has a sand pad layer, and the bottom of the sand pad layer has a pressure-resistant insulation layer. The outer surface of the outer insulation layer, the outer side of the sand pad layer, the outer side of the pressure-resistant insulation layer, and the bottom are covered with a skin layer. This design can absorb the axial expansion force generated by the tank due to the increase in temperature while meeting the insulation and settling requirements of the storage tank itself. Furthermore, a grid is installed at the bottom of the tank, which can trap some high-temperature solid particles, creating a dead zone for their flow. After a period of initial use, the high-temperature solid particles entering the tank will only impact the particles in the bottom grid, without eroding the bottom plate, thus significantly extending the tank's service life and safety. Therefore, the high-temperature solid particle storage tank for solar thermal power generation of this invention effectively reduces erosion and wear caused by solid particles, mitigates the impact of thermal expansion forces on the tank, reduces or avoids potential safety accidents, and features good energy storage and insulation, low heat loss, and long service life.

[0015] The present invention will now be described in detail with reference to the accompanying drawings and embodiments. Attached Figure Description

[0016] Figure 1 This is a front view of a structural schematic diagram of the high-temperature solid particle storage tank for solar thermal power generation according to the present invention.

[0017] Figure 2 This is a top view of the structural schematic diagram of the high-temperature solid particle storage tank for solar thermal power generation according to the present invention. Detailed Implementation

[0018] like Figure 1 and Figure 2 As shown, the high-temperature solid particle storage tank for solar thermal power generation of the present invention includes a tank body. A main feed pipe 7 is provided vertically above the tank body. The outlet of the main feed pipe 7 is located at the bottom end of the main feed pipe 7. The outlet of the main feed pipe 7 is connected to the inlet of a plurality of branch feed pipes 9. The plurality of branch feed pipes 9 extend downward into the tank body. A flow guiding module 10 is provided below the outlet of the plurality of branch feed pipes 9. The solid particles flowing out of the outlet of the branch feed pipes 9 will first touch the upward-facing, inclined surface of the flow guiding module 10 during the falling process, and then continue to fall to the lower part of the tank body.

[0019] The lower part of the tank body is provided with a grid 11, and the bottom of the tank body is provided with a discharge port and one or more emergency discharge ports. The discharge port at the bottom of the tank body is connected to the inlet of the discharge pipe 12, and each emergency discharge port is connected to the inlet of an emergency discharge pipe 13. The above design can not only meet the discharge requirements under normal operating conditions, but also ensure the rapid emptying of high-temperature solid particles in the storage tank in the event of a safety accident.

[0020] The tank body includes a metal shell 1 made of steel. The inner surface of the metal shell 1 is covered with an inner insulation layer 2. The exposed surface of the inner insulation layer 2 is provided with a wear-resistant and fire-resistant layer. The sides and top of the outer surface of the metal shell 1 are provided with an outer insulation layer 3. There is a reserved gap of not less than 3mm between the outer surface of the metal shell 1 and the outer insulation layer 3 to prevent the outer insulation layer 3 from being damaged due to the expansion of the metal shell 1. A steel structure frame for fixing the outer insulation layer 3 and the metal shell 1 is embedded in the outer insulation layer 3. A sand pad layer 4 is provided at the bottom of the metal shell 1. A pressure-resistant insulation layer 5 is provided at the bottom of the sand pad layer 4. The outer surface of the outer insulation layer 3, the outer side of the sand pad layer 4, the outer side of the pressure-resistant insulation layer 5, and the bottom are covered with a skin layer 6.

[0021] As a further improvement of the present invention, a 5mm to 10mm reserved gap is provided between the outer surface of the metal shell 1 and the outer insulation layer 3, and an electrically controlled slide valve 8 is connected in series on the main feed pipe 7, the discharge pipe 12 and each emergency discharge pipe 13.

[0022] As a further improvement of the present invention, the number of the above-mentioned feed pipes 9 is 3 to 8, the number of the flow guiding modules 10 is 3 to 8, and the number of the emergency discharge pipes 13 is 2 to 6.

[0023] As a further improvement of the present invention, the cross-section of the above-mentioned flow guiding module 10 along the vertical direction is a triangle or a right trapezoid, the angle between the inclined surface of the flow guiding module 10 and the horizontal plane is 20° to 60°, and the flow guiding module 10 is made of heat-resistant alloy steel.

[0024] As a further improvement of the present invention, the discharge port of the emergency unloading pipe 13 is connected to the storage ditch provided outside the storage tank.

[0025] As a further improvement of the present invention, the aforementioned sand cushion layer 4 is composed of quartz particles or ceramic particles, and the wear-resistant and fire-resistant layer is composed of ceramic coating. The ceramic coating is sprayed onto the inner insulation layer 2 by supersonic flame spraying or plasma spraying. The quartz particles or ceramic particles can not only ensure uniform settling of the storage tank, but also partially absorb the axial expansion force generated by the temperature rise of the storage tank.

[0026] As a further improvement of the present invention, the cross-section of the above-mentioned tank is circular, and the tank is provided with a temperature measuring device for measuring the temperature of solid particles inside the tank.

[0027] As a further improvement of the present invention, the filling cavity of the above-mentioned tank is provided with 8 to 20 temperature measuring points.

[0028] In use, the high-temperature solid particle storage tank for solar thermal power generation of the present invention allows high-temperature solid particles to enter the tank body through multiple feed pipes 9, and first contact the corresponding flow guiding module. On the one hand, this avoids the high-temperature solid particles directly eroding the inner wall of the tank body, and on the other hand, it reduces the flow velocity of the high-temperature solid particles, thereby mitigating the erosive effect of the high-temperature solid particles on the bottom of the tank body. Since the tank body includes a metal shell 1 made of steel, the inner surface of the metal shell 1 is covered with an inner insulation layer 2, the outer side and top of the outer surface of the metal shell 1 are provided with an outer insulation layer 3, the bottom of the metal shell 1 is provided with a sand pad layer 4, the bottom of the sand pad layer 4 is provided with a pressure-resistant insulation layer 5, and the outer surface of the outer insulation layer 3, the outer side of the sand pad layer 4, the outer side of the pressure-resistant insulation layer 5, and the bottom are covered with a skin layer 6. This design can absorb the axial expansion force generated by the tank due to the increase in temperature while meeting the insulation and settling requirements of the storage tank itself. Furthermore, a grid 11 is provided at the bottom of the tank. This grid 11 can trap some high-temperature solid particles, creating a dead zone for their flow. After a period of initial use, the high-temperature solid particles entering the tank will only impact the particles within the bottom grid, without eroding the bottom plate. This significantly extends the tank's service life and safety. Therefore, the high-temperature solid particle storage tank for solar thermal power generation of this invention effectively reduces erosion and wear caused by solid particles, mitigates the impact of thermal expansion forces on the tank, reduces or avoids potential safety accidents, and features good energy storage and insulation, low heat loss, and a long service life.

[0029] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Various modifications and improvements made by those skilled in the art to the technical solutions of the present invention without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.

Claims

1. A high-temperature solid-particle storage tank for photo-thermal power generation, characterized by: The application relates to a solid particle storage tank, which comprises a tank body, a main feeding pipe (7) arranged on the upper portion of the tank body along the vertical direction, a discharge port of the main feeding pipe (7) located at the bottom end of the main feeding pipe (7), a plurality of sub-feeding pipes (9) communicated with the discharge port of the main feeding pipe (7) respectively, the sub-feeding pipes (9) respectively extending downwards into the tank body, a flow guide module (10) arranged below the discharge port of the sub-feeding pipes (9), and solid particles discharged from the discharge port of the sub-feeding pipes (9) first touching the upward and high-outer-low-inward inclined surface of the flow guide module (10) and then falling into the lower portion of the tank body. The lower portion of the tank body is provided with a grid (11), the bottom of the tank body is provided with one discharge port and more than one emergency discharge port, the discharge port of the tank body is communicated with the feeding port of a discharge pipe (12), and each emergency discharge port is communicated with the feeding port of an emergency discharge pipe (13). The tank body comprises a metal shell (1) made of steel, the inner surface of the metal shell (1) is attached with an inner thermal insulation layer (2), the exposed surface of the inner thermal insulation layer (2) is provided with a wear-resistant and fire-resistant layer, the side surface and the top of the outer surface of the metal shell (1) are provided with an outer thermal insulation layer (3), a reserved gap with a size not less than 3 mm is arranged between the outer surface of the metal shell (1) and the outer thermal insulation layer (3) to avoid the expansion of the metal shell (1) and the damage of the outer thermal insulation layer (3), a steel structure framework for fixing the outer thermal insulation layer (3) and the metal shell (1) is embedded in the outer thermal insulation layer (3), the bottom of the metal shell (1) is provided with a sand cushion layer (4), the bottom of the sand cushion layer (4) is provided with a pressure-resistant thermal insulation layer (5), and the outer surface of the outer thermal insulation layer (3), the outer side surface of the sand cushion layer (4), the outer side surface and the bottom of the pressure-resistant thermal insulation layer (5) are covered with a skin layer (6).

2. The high-temperature solid-particle storage tank for a solar thermal power plant according to claim 1, characterized by: The reserved gap between the outer surface of the metal shell (1) and the outer thermal insulation layer (3) is 5-10 mm, and the main feeding pipe (7), the discharge pipe (12) and each emergency discharge pipe (13) are respectively connected with an electric control plug-in valve (8).

3. The high-temperature solid-particle storage tank for a solar thermal power plant according to claim 2, characterized by: The number of the sub-feeding pipes (9) is 3-8, the number of the flow guide modules (10) is 3-8, and the number of the emergency discharge pipes (13) is 2-6.

4. The high-temperature solid-particle storage tank for a solar thermal power plant according to claim 3, characterized by: The cross section of the flow guide module (10) along the vertical direction is triangular or right trapezoidal, the included angle between the inclined surface of the flow guide module (10) and the horizontal plane is 20-60 degrees, and the flow guide module (10) is made of heat-resistant alloy steel.

5. The high-temperature solid-particle storage tank for a solar thermal power plant according to claim 4, characterized by: The discharge port of the emergency discharge pipe (13) is communicated with a storage groove arranged outside the storage tank.

6. The high-temperature solid-particle storage tank for a solar thermal power plant according to any one of claims 1 to 5, characterized in that: The sand cushion layer (4) is composed of quartz particles or ceramic particles, the wear-resistant and fire-resistant layer is composed of ceramic coating, and the ceramic coating is sprayed on the inner thermal insulation layer (2) by means of supersonic flame spraying or plasma spraying.

7. The high-temperature solid-particle storage tank for a solar thermal power plant according to claim 6, characterized in that: The cross section of the tank body is circular, and the tank body is provided with a temperature measuring device for measuring the temperature of the solid particles in the tank body.

8. The high-temperature solid-particle storage tank for a solar thermal power plant according to claim 7, characterized by: 8-20 temperature measuring points are arranged in the loading cavity of the tank body.

Images