A photovoltaic power generation fire-fighting water storage tank

Abstract

This utility model discloses a photovoltaic power generation fire-fighting water storage tank, belonging to the field of water storage technology. It includes a water tank body, several sets of photovoltaic power generation modules installed above the water tank body, an electrical control box connected to the photovoltaic power generation modules, several submersible electric heating pipes connected to the electrical control box inside the water tank body, and a temperature sensor connected to the electrical control box inside the water tank body. The top plate of the water tank body is located above the maximum frost line; an inspection hole is provided on the top plate, higher than the ground surface; photovoltaic power generation modules are arranged on the top plate; and the submersible electric heating pipes are located above the maximum frost line inside the water tank body. This utility model can significantly reduce the burial depth of the water tank, reduce the excavation depth of the water tank, reduce the amount of excavation and support work, reduce the reinforcement and thickness of the water tank top plate, and reduce the power consumption for heating the water storage tank.

Description

Technical Field

[0001] This utility model relates to the field of water storage technology, and in particular to a fire-fighting water storage tank for photovoltaic power generation. Background Technology

[0002] With the rapid development of new energy power generation projects, a large number of booster stations are being built to support these projects. These stations are equipped with water-based fire suppression systems, making fire-fighting water storage tanks essential. However, in frigid regions, anti-freezing measures for these tanks are crucial. If the fire-fighting water freezes, the tank may burst and leak, causing significant losses. Furthermore, frozen fire-fighting water cannot be used during a fire, potentially leading to casualties and substantial property damage. Therefore, fire-fighting water storage tanks must remain frozen.

[0003] In most frigid regions, deep burial is used to address the freezing problem of fire-fighting water storage tanks. The top of the tank is designed to be below the local maximum frost depth to prevent the fire-fighting water from freezing. While this method effectively prevents freezing, it results in very deep burial depths and thick soil cover, requiring increased reinforcement and thickness of the tank top slab, thus increasing project costs. Furthermore, the increased tank depth leads to very deep excavations, especially in confined spaces or near other buildings. Deep excavation poses high safety risks, requires specialized support, incurs high costs, and can easily damage nearby structures, making construction extremely difficult. When the groundwater level is high, dewatering is necessary, which is also very costly. Moreover, deep excavations require separate expert assessments, a cumbersome process that further complicates construction.

[0004] In the construction of new energy booster stations in frigid regions, the traditional deep-buried antifreeze method for fire-fighting water storage tanks has revealed prominent contradictions such as "high cost, high risk, and difficult construction." At the same time, the long-term idle space on top of the water storage tanks and the urgent need for distributed photovoltaic installations within the station provide a natural scenario for "integrated photovoltaic-fire-fighting water storage tank antifreeze technology."

[0005] Therefore, there is an urgent need for an integrated antifreeze system that combines photovoltaics, energy storage, electric heating, and insulation to eliminate or significantly reduce the burial depth, lower the overall project cost, and meet the stringent requirements of "zero freezing, maintenance-free, and high safety" for fire-fighting water storage tanks in frigid regions. Utility Model Content

[0006] The technical problem to be solved by this utility model is to provide a photovoltaic power generation fire-fighting water storage tank, which can significantly reduce the excavation depth of the water tank, reduce the amount of excavation and support work, reduce the reinforcement and thickness of the top slab of the water tank, and reduce the power consumption for heating the water storage tank.

[0007] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:

[0008] A photovoltaic power generation fire-fighting water storage tank includes a tank body, several sets of photovoltaic power generation components installed above the tank body, an electrical control box connected to the photovoltaic power generation components, several submersible electric heating tubes connected to the inside of the tank body by the electrical control box, and a temperature sensor connected to the inside of the tank body by the electrical control box.

[0009] The top of the water tank body is provided with a top plate, which is located above the maximum frost layer; an inspection hole is provided on the top plate, and the apex of the inspection hole is higher than the ground.

[0010] The submersible electric heating tube is installed above the maximum frost line inside the water tank body.

[0011] A further improvement of this utility model is that: the inspection hole is provided as two, respectively located at two opposite corners of the top plate.

[0012] A further improvement of this utility model is that: two submersible electric heating tubes are provided, which are led down from the inspection hole into the interior of the water tank body.

[0013] A further improvement of this utility model is that: an insulation layer and a soil covering layer are sequentially arranged above the top plate, and the upper surface of the soil covering layer is flush with the ground.

[0014] A further improvement of this utility model is that the thickness of the soil covering layer is 400-800mm.

[0015] A further improvement of this utility model is that the photovoltaic power generation module is installed on the soil cover layer, and the photovoltaic power generation module is connected to the electrical control box through an inverter.

[0016] A further improvement of this utility model is that an insulation layer is provided around the water tank body above the maximum frost line.

[0017] A further improvement of this utility model is that the temperature sensor is positioned between the maximum frost line and the water level line in the middle of the water tank body.

[0018] The technological advancements achieved by this utility model due to the adoption of the above technical solution are as follows:

[0019] This utility model sets the fire-fighting water storage tank above the maximum frost line and introduces heating devices and photovoltaic modules, which ensures the water temperature while greatly reducing the excavation depth of the fire-fighting water storage tank. It is especially suitable for sites with limited space or close proximity to other buildings. It also reduces the thickness of the soil cover on the top of the tank, the reinforcement and thickness of the tank top slab, and lowers the project cost. Attached Figure Description

[0020] Figure 1 This is a top view of the fire-fighting water storage tank for photovoltaic power generation in this utility model;

[0021] Figure 2 This is a side view of the fire-fighting water storage tank for photovoltaic power generation in this utility model;

[0022] The components include: 1. the water tank body; 2. the insulation layer; 3. the photovoltaic power generation components; 4. the submersible electric heating tube; and 5. the electrical control box. Detailed Implementation

[0023] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments:

[0024] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0025] Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first," "second," etc., may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0026] like Figure 1 As shown, a photovoltaic power generation fire-fighting water storage tank includes a tank body 1, a photovoltaic power generation module 3 installed above the tank body 1, an electrical control box 5 connected to the photovoltaic power generation module 3, a submersible electric heating tube 4 and a temperature sensor connected to the tank body 1 by the electrical control box 5.

[0027] The top of the water tank body 1 is provided with a top plate, which is set above the maximum frost layer. An insulation layer 2 and a soil covering layer are sequentially provided above the top plate, and the upper surface of the soil covering layer is flush with the ground. Inspection holes are provided at two opposite corners of the top plate, and the apex of the inspection holes is higher than the ground.

[0028] The photovoltaic power generation module 3 is installed on the soil cover layer, and the photovoltaic power generation module 3 is connected to the electrical control box 5 through an inverter.

[0029] The submersible electric heating tube 4 is configured as two tubes, which are led down from the inspection hole into the interior of the water tank body 1. The submersible electric heating tube 4 is suspended above the maximum frost line by a wire connected to the electrical control box 5.

[0030] The temperature sensor is located between the maximum frost line and the water level line in the middle of the water tank body 1.

[0031] Example

[0032] like Figure 2 As shown, with 300m 3 Taking a water storage tank with a frost line of -2m, a soil cover thickness of 600mm, and a depth of -3.6m as an example, the water depth above the frost line is 1m, the water volume above the frost line is approximately 125 tons, and the total heat dissipation area of ​​the tank top and surrounding areas is S = 170m². 2 The top and sides are insulated with rock wool. The thermal conductivity of rock wool is λ = 0.05 W / (m*℃), and the thickness of insulation layer 2 is L = 0.1 m.

[0033] (1) Calculation of water temperature drop:

[0034] Assuming a target water temperature of 5℃ and an ambient temperature of -20℃, with the temperature below ground gradually increasing to 0℃ with depth, and the ambient temperature averaging approximately -10℃, the temperature difference between the target and ambient temperatures is ΔT0 = 15℃. In this environment, the total heat dissipation over 24 hours is:

[0035] Q 总 =(λS△T0 / L)t=1.1×10 8 J;

[0036] The specific heat capacity of water is c = 4.2 × 10⁻⁶. 3 J / (kg*℃), mass of water m=125×10 3 kg;

[0037] Calculate the temperature drop of the water:

[0038] △T=Q 总 / mc=0.21℃;

[0039] Based on the above calculations, the temperature of the reservoir drops by approximately 0.21℃ within 24 hours.

[0040] (2) Heating power calculation:

[0041] To prevent the pool water temperature from dropping, a submersible electric heating element 4 is used to heat the pool water. Power is supplied by a top-mounted photovoltaic power generation module 3. Assuming the photovoltaic power generation module operates for more than 4 hours during the day, the heating calculation for the submersible electric heating element 4 is as follows:

[0042] P = Q 总 / t=7.64kW;

[0043] Considering the conversion efficiency of electric heating, the heating equipment is selected as 9kW.

[0044] Based on the above calculations, two 4.5kW submersible electric heating tubes 4 are selected to heat the pool water for 4 hours a day, which can keep the pool water temperature constant.

[0045] (3) Photovoltaic module configuration

[0046] Based on the photovoltaic power generation modules currently used in the market, each module generates approximately 600W of power. Considering redundancy design, 33 modules are selected, and the maximum power generation can reach 19.8kW.

[0047] (4) Temperature control

[0048] As winter temperatures gradually decrease and diurnal temperature variations occur, the system incorporates a temperature sensor within the water storage tank and a relay connected to the sensor within the electrical control box. During operation of the submersible electric heating element 4, when the temperature sensor measures a temperature higher than the first set value, the first relay activates, shutting off the submersible electric heating element 4, thus achieving precise temperature control. When the temperature is too high, the heating time is automatically reduced to achieve energy savings. During non-operational periods, when the temperature sensor measures a temperature lower than the second set value, the second relay activates, shutting off the submersible electric heating element 4. When photovoltaic power generation cannot meet the heating power consumption due to weather conditions, grid power is used as a supplement to ensure heating temperature.

[0049] In summary, this utility model can significantly reduce the excavation depth of the water tank, reduce the amount of excavation and support work, reduce the reinforcement and thickness of the water tank top slab, and reduce the power consumption for heating the water storage tank.

Claims

1. A photovoltaic powered fire reservoir, characterized by: It includes a water tank body (1), several sets of photovoltaic power generation components (3) set above the water tank body (1), an electrical control box (5) connected to the photovoltaic power generation components (3), several submersible electric heating tubes (4) connected to the inside of the water tank body (1) by the electrical control box (5), and a temperature sensor connected to the inside of the water tank body (1) by the electrical control box (5). The top of the water tank body (1) is provided with a top plate, which is located above the maximum frost layer; an inspection hole is provided on the top plate, and the top of the inspection hole is higher than the ground. The submersible electric heating tube (4) is located above the maximum frost line inside the water tank body (1).

2. The photovoltaic powered fire reservoir of claim 1, wherein: The inspection hole is provided in two places, located at opposite corners of the top plate.

3. The photovoltaic powered fire reservoir of claim 1, wherein: Two submersible electric heating tubes (4) are provided, which are led down from the inspection hole into the interior of the water tank body (1).

4. The photovoltaic powered fire reservoir of claim 1, wherein: An insulation layer (2) and a soil covering layer are sequentially installed above the top plate, with the upper surface of the soil covering layer flush with the ground.

5. The photovoltaic powered fire reservoir of claim 4, wherein: The thickness of the soil cover layer is 400–800 mm.

6. The photovoltaic powered fire reservoir of claim 1, wherein: The photovoltaic power generation module (3) is installed on the soil cover layer and is connected to the electrical control box (5) through an inverter.

7. The photovoltaic powered fire reservoir of claim 1, wherein: The water tank body (1) is provided with an insulation layer (2) around its perimeter above the maximum frost line.

8. The photovoltaic powered fire reservoir of claim 1, wherein: The temperature sensor is located between the maximum frost line and the water level line in the middle of the water tank body (1).

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