Photovoltaic energy storage system for zero-carbon park

Abstract

The utility model discloses a photovoltaic energy storage system for a zero-carbon park, which belongs to the field of photovoltaic application and comprises a photovoltaic power generation unit, a solid energy storage unit and an energy output unit, the solid energy storage unit is used for storing electric energy of the photovoltaic power generation unit and electric energy of the photovoltaic power generation unit in a valley electricity stage, and the solid energy storage unit is provided with a heat storage brick spacing regulator; the energy output unit is used for supplying energy to park processing and production; the solid energy storage unit and the photovoltaic power generation unit are connected with the energy output unit. The photovoltaic energy storage system for the zero-carbon park with the structure is used for supplying energy to the park, energy supply of steam production, building refrigeration and heating and high-temperature heat conduction oil is achieved through the energy output unit, and the functional requirements of different application scenes are met.

Description

Technical Field

[0001] The utility model relates to the technical field of photovoltaic energy storage, and in particular to a photovoltaic energy storage system for a zero-carbon park. Background Art

[0002] The processing and production in the industrial park has a large demand for heat. In order to reduce electricity consumption, the existing technology uses photovoltaic power generation to supplement it. The existing photovoltaic energy storage system has a single energy output mode and cannot meet the functional requirements of different application scenarios. Utility Model Content

[0003] The purpose of the utility model is to provide a photovoltaic energy storage system for a zero-carbon park, which is used for energy supply in the park. Through the energy output unit, it realizes the energy supply for steam production, building cooling and heating, and high-temperature thermal oil, meeting the functional requirements of different application scenarios.

[0004] To achieve the above-mentioned purpose, the utility model provides a photovoltaic energy storage system for a zero-carbon park, including a photovoltaic power generation unit, characterized in that: it also includes

[0005] A solid energy storage unit is used to store the photovoltaic power generation unit and the electric energy in the valley power stage. The solid energy storage unit is provided with a heat storage brick spacing regulator;

[0006] Energy output unit, used to supply energy for processing and production in the park;

[0007] The solid energy storage unit and the photovoltaic power generation unit are both connected to the energy output unit.

[0008] Preferably, the photovoltaic power generation unit includes a photovoltaic power generation panel, an inverter and a photovoltaic grid-connected box. The photovoltaic power generation panel is connected to the photovoltaic grid-connected box through the inverter. The photovoltaic grid-connected box and the municipal power distribution station are both connected to the low-voltage distribution cabinet, and the low-voltage distribution cabinet is connected to the power control cabinet.

[0009] Preferably, the solid energy storage unit includes an insulating shell, an electric heating element, a fin-tube heat exchanger and a variable frequency circulation fan. The heat storage bricks are arranged in the insulating shell through a spacing adjuster, the electric heating element is inserted into the heat storage bricks, the outer cover of the heat storage bricks is provided with an insulating heat insulation cover, and the top of the insulating heat insulation cover is provided with ventilation holes. The fin-tube heat exchanger is arranged in the insulating shell, the variable frequency circulation fan is fixed to the side wall of the insulating shell and arranged opposite to the fin-tube heat exchanger, and the variable frequency circulation fan and the electric heating element are both connected to the power control cabinet.

[0010] Preferably, the spacing adjuster includes a telescopic support frame, a linkage plate is fixed on one side of the telescopic support frame, one side of the linkage plate is fixedly connected to the telescopic end of the electric telescopic rod, a plurality of upper support rods and a plurality of lower support rods arranged in parallel are fixed on the telescopic support frame, a fixed mesh plate is fixed to the upper support rod, heat storage bricks are arranged on the fixed mesh plate, a support wheel is installed at the bottom of the lower support rod, and the electric telescopic rod is connected to the power control cabinet.

[0011] Preferably, the energy output unit includes a steam cylinder connected to the fin-tube heat exchanger, and a water feed pump is provided on the connecting pipe between the water inlet end of the fin-tube heat exchanger and the softening water device, and the water feed pump is connected to the power control cabinet.

[0012] Preferably, the energy output unit comprises a lithium bromide unit connected to a fin-tube heat exchanger, and a water feed pump is provided on the connecting pipe between the water inlet end of the fin-tube heat exchanger and the softening water device;

[0013] A plate heat exchanger is arranged between the fin tube heat exchanger and the softening water device, the plate heat exchanger is connected to a fan coil through a pipeline circulation pump, the fan coil is connected to the lithium bromide unit, the lithium bromide unit is connected to a cooling tower, and a cooling circulation pump is arranged on the pipeline between the cooling tower and the lithium bromide unit;

[0014] The water feed pump, pipeline circulation pump and cooling circulation pump are all connected to the power control cabinet.

[0015] Preferably, the energy output unit includes a heat transfer oil unit, an oil-gas separator and a heat transfer oil circulation pump which are connected in sequence. The heat transfer oil circulation pump and the heat transfer oil unit are respectively connected to the two ends of the fin-tube heat exchanger, and the oil-gas separator is connected to a nitrogen sealing device through high and low level tanks.

[0016] Therefore, the utility model adopts a photovoltaic energy storage system for a zero-carbon park with the above structure, which has the following beneficial effects:

[0017] (1) By coupling the solid energy storage unit with the energy output unit, the energy supply for steam production, building cooling and heating, and high-temperature heat transfer oil is realized, meeting the functional requirements of different application scenarios.

[0018] (2) The heat storage bricks are arranged in the heat-insulating shell through a spacing adjuster. The spacing of the heat storage bricks can be adjusted according to the working state of the solid energy storage unit to improve the heat exchange efficiency.

[0019] The technical solution of the utility model is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic structural diagram of Example 1 of a photovoltaic energy storage system for a zero-carbon park according to the utility model;

[0021] Figure 2 This is a schematic diagram of the structure of the spacing regulator of the utility model;

[0022] Figure 3 This is a schematic structural diagram of Embodiment 2 of a photovoltaic energy storage system for a zero-carbon park according to the utility model;

[0023] Figure 4 This is a structural schematic diagram of Example 3 of a photovoltaic energy storage system for a zero-carbon park according to the utility model.

[0024] Reference numerals

[0025] 1. Photovoltaic power generation unit; 101. Photovoltaic power generation panel; 102. Inverter; 103. Photovoltaic grid-connected box; 104. Low-voltage power distribution cabinet; 105. Power control cabinet; 106. Power distribution station;

[0026] 2. Solid energy storage unit; 201. Heat storage brick; 202. Electric heating element; 203. Fin tube heat exchanger; 204. Frequency conversion circulation fan; 205. Insulation heat shield; 206. Insulation shell; 207. Spacing adjuster; 2071. Telescopic support frame; 2072. Linkage plate; 2073. Electric telescopic rod; 2074. Upper support rod; 2075. Lower support rod; 2076. Fixed mesh plate; 2077. Support wheel;

[0027] 3. Energy output unit; 301. Water supply pump; 302. Water softening device; 303. Steam cylinder;

[0028] 304, fan coil unit; 305, lithium bromide unit; 306, cooling tower; 307, cooling circulation pump; 308, pipeline circulation pump; 309, plate heat exchanger;

[0029] 310. Thermal unit for heat transfer oil; 311. Heat transfer oil circulation pump; 312. High and low level tanks; 313. Oil and gas separator; 314. Nitrogen sealing device. DETAILED DESCRIPTION

[0030] Example

[0031] In the description of the present utility model, it should be noted that the terms "upper", "lower", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, or are directions or positional relationships in which the utility model product is usually placed when in use. They are only for the convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present utility model.

[0032] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "setting", "installation" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0033] Some implementation methods of the present utility model are described in detail below in conjunction with the accompanying drawings.

[0034] Example 1

[0035] like Figure 1 As shown, a photovoltaic energy storage system for a zero-carbon park includes a photovoltaic power generation unit 1, a solid energy storage unit 2 and an energy output unit 3, wherein the solid energy storage unit 2 and the photovoltaic power generation unit 1 are both connected to the energy output unit 3. The photovoltaic power generation unit 1 includes a photovoltaic power generation panel 101, an inverter 102 and a photovoltaic grid-connected box 103, wherein the photovoltaic power generation panel 101 is connected to the photovoltaic grid-connected box 103 through the inverter 102, and the photovoltaic grid-connected box 103 and the city power distribution station 106 are both connected to the low-voltage distribution cabinet 104, and the low-voltage distribution cabinet 104 is connected to the power control cabinet 105.

[0036] The solid energy storage unit 2 is used to store the photovoltaic power generation unit 1 and the electric energy in the valley power stage. The solid energy storage unit 2 is provided with a heat storage brick 201 spacing adjuster 207. The solid energy storage unit 2 includes a heat preservation shell 206, an electric heating element 202, a fin-tube heat exchanger 203 and a variable frequency circulation fan 204. The heat storage brick 201 is arranged in the heat preservation shell 206 through the spacing adjuster 207. The electric heating element 202 is inserted into the heat storage brick 201. The outer cover of the heat storage brick 201 is provided with an insulating heat insulation cover 205. The top of the insulating heat insulation cover 205 is provided with ventilation holes. The fin-tube heat exchanger 203 is arranged in the heat preservation shell 206. The variable frequency circulation fan 204 is fixed to the side wall of the heat preservation shell 206 and is arranged opposite to the fin-tube heat exchanger 203. The variable frequency circulation fan 204 and the electric heating element 202 are both connected to the power control cabinet 105. Figure 2 As shown, the spacing adjuster 207 includes a telescopic support frame 2071, a linkage plate 2072 is fixed on one side of the telescopic support frame 2071, and one side of the linkage plate 2072 is fixedly connected to the telescopic end of the electric telescopic rod 2073. A plurality of upper support rods 2074 and a plurality of lower support rods 2075 arranged in parallel are fixed on the telescopic support frame 2071, a fixed mesh plate 2076 is fixed to the upper support rod 2074, the heat storage bricks 201 are arranged on the fixed mesh plate 2076, the bottom support wheel 2077 of the lower support rod 2075, and the electric telescopic rod 2073 is connected to the power control cabinet 105.

[0037] The energy output unit 3 is used to supply energy to the processing and production of the industrial park. The energy output unit 3 of this embodiment includes a steam cylinder 303 connected to the fin-tube heat exchanger 203, and a water supply pump 301 is provided on the connecting pipe between the water inlet end of the fin-tube heat exchanger 203 and the softening water device 302. The water supply pump 301 is connected to the power control cabinet 105 to provide high-temperature steam for industrial park production.

[0038] The specific working principle is as follows:

[0039] 1. When the photovoltaic power generation unit 1 has sufficient power, the photovoltaic power generation unit 1 is used first to generate industrial steam. The photovoltaic power generation panel 101 generates direct current, which is converted into alternating current through the inverter 102. The alternating current supplies power to the power control cabinet 105 through the low-voltage distribution cabinet 104. The power control cabinet 105 is connected to the electric heating element 202. Through the action of the current, the electric heating element 202 converts electrical energy into thermal energy, which is absorbed by the heat storage brick 201. This embodiment uses a ceramic heat storage body. At this time, the spacing between the heat storage bricks 201 is very small, which reduces heat dissipation losses and thus stores a large amount of heat energy. When the stored heat energy needs to be released, the electric telescopic rod 2073 of the spacing adjuster 207 contracts and pulls the contraction support frame to adjust the spacing of the fixed mesh plate 2076, so as to reduce wind resistance and improve heat exchange efficiency. The power control cabinet 105 starts the variable frequency circulation fan 204 to release a large amount of heat energy in the heat storage brick 201 into the air through air circulation. The high-temperature air passes through the fin-tube heat exchanger 203 to store the heat energy and release it when needed. The softening water device 302 is used to remove calcium and magnesium ions in the water. The water feed pump 301 transports cold water to the fin-tube heat exchanger 203 through the medium circulation pipeline and generates high-temperature steam after heat exchange with the high-temperature air. It is transported to the process heat unit through the steam cylinder 303 to meet production needs.

[0040] 2. When the photovoltaic power generation unit 1 has sufficient power and surplus, it stores energy through the solid energy storage unit 2 to meet the production process needs in other periods.

[0041] 3. During the off-peak hours at night, the 10KV public line is converted into 0.4KV low-voltage electricity through the distribution station 106, and the low-priced off-peak electricity is used to drive the electric heating element 202 through the low-voltage distribution cabinet 104 and the power control cabinet 105, and finally the low-priced nighttime electricity is converted into high-temperature thermal energy and stored in the heat storage bricks 201 for the production process needs during the day.

[0042] Example 2

[0043] like Figure 3As shown, the difference between this embodiment and embodiment 1 is that the energy output unit 3 is different. The energy output unit 3 of this embodiment includes a lithium bromide unit 305 connected to the fin-tube heat exchanger 203, and a water feed pump 301 is provided on the connecting pipe between the water inlet end of the fin-tube heat exchanger 203 and the softening water device 302.

[0044] A plate heat exchanger 309 is provided between the fin tube heat exchanger 203 and the softening water device 302. The plate heat exchanger 309 is connected to the fan coil 304 through a pipeline circulation pump 308. The fan coil 304 is connected to the lithium bromide unit 305. The lithium bromide unit 305 is connected to a cooling tower 306. A cooling circulation pump 307 is provided on the pipeline between the cooling tower 306 and the lithium bromide unit 305. The feed water pump 301, the pipeline circulation pump 308 and the cooling circulation pump 307 are all connected to the power control cabinet 105.

[0045] The specific working process is as follows:

[0046] The process of generating high temperature steam is the same as that in Example 1 and will not be described in detail here.

[0047] When the photovoltaic power generation unit 1 has sufficient power, the photovoltaic power generation unit 1 is used preferentially to generate industrial steam. The photovoltaic power generation panel 101 generates direct current, which is converted into alternating current through the inverter 102. The alternating current supplies power to the power control cabinet 105 through the low-voltage distribution cabinet 104. The power control cabinet 105 is connected to the electric heating element 202. Through the action of the current, the electric heating element 202 converts electrical energy into thermal energy, which is absorbed by the heat storage brick 201. This embodiment uses a ceramic heat storage body. At this time, the spacing between the heat storage bricks 201 is very small, which reduces the heat dissipation loss and thus stores a large amount of heat energy. When the stored heat energy needs to be released, the electric telescopic rod 2073 of the spacing adjuster 207 contracts and pulls the contraction support frame to adjust the spacing of the fixed mesh plate 2076, so as to reduce wind resistance and improve heat exchange efficiency. The power control cabinet 105 starts the variable frequency circulation fan 204 to release a large amount of heat energy in the heat storage brick 201 into the air through air circulation. The high-temperature air passes through the fin-tube heat exchanger 203 to store the heat energy and release it when needed. The softening water device 302 is used to remove calcium and magnesium ions in the water. The water supply pump 301 transports cold water to the fin-tube heat exchanger 203 through the medium circulation pipeline and generates high-temperature steam after heat exchange with the high-temperature air.

[0048] Refrigeration: High-temperature steam enters the lithium bromide unit 305. The lithium bromide unit 305 uses lithium bromide as an absorbent and is driven by high-temperature steam for refrigeration. After refrigeration, the steam becomes condensed water and is transported to the softening water device 302 for recycling. The cooling water circulation pump transports the cooling water to the cooling tower 306. Under the action of the fan of the cooling tower 306, the heat in the cooling water is dissipated into the atmosphere, the temperature is reduced, and then the cooling water enters the refrigerator from the cooling water inlet, and the cycle repeats. The chilled water is transported to the fan coil 304 through the pipeline circulation pump 308, and the fan coil 304 realizes the function of building refrigeration.

[0049] Heating: High-temperature steam enters the plate heat exchanger 309, and converts cold water into high-temperature hot water through heat exchange with cold water. The high-temperature steam becomes condensed water and is transported to the softening water device 302 for recycling. The high-temperature hot water is transported to the fan coil 304 through the pipeline circulation pump 308, and the fan coil 304 realizes the function of building heating.

[0050] The refrigeration circulation passage and the heating circulation passage share a pipeline circulation pump 308, and the lithium bromide unit 305 and the plate heat exchanger 309 are switched between the cooling season and the heating season through a plurality of manual valves arranged on the pipeline.

[0051] Example 3

[0052] like Figure 4 As shown, the difference between this embodiment and embodiment 1 is that the energy output unit 3 is different. The energy output unit 3 of this embodiment includes a heat transfer oil heat unit 310, an oil-gas separator 313 and a heat transfer oil circulation pump 311 which are connected in sequence. The heat transfer oil circulation pump 311 and the heat transfer oil heat unit 310 are respectively connected to the two ends of the fin-tube heat exchanger 203, and the oil-gas separator 313 is connected to a nitrogen sealing device 314 through a high and low position tank 312.

[0053] Specific working process:

[0054] When the photovoltaic power generation unit 1 has sufficient power, the photovoltaic power generation unit 1 is used first to generate industrial high-temperature heat transfer oil. The photovoltaic power generation panel 101 generates direct current, which is converted into alternating current through the inverter 102. The alternating current supplies power to the power control cabinet 105 through the low-voltage power distribution cabinet 104. The power control cabinet 105 is connected to the electric heating element 202. Through the action of the current, the electric heating element 202 converts the electric energy into heat energy, and the heat is absorbed by the heat storage brick 201, thereby storing a large amount of heat energy. When the stored heat energy needs to be released, the power control cabinet 105 will start the variable frequency circulation fan 204 to operate, and through air circulation, a large amount of heat energy in the heat storage brick 201 is released into the air. The high-temperature air passes through the fin tube heat exchanger 203, stores the heat energy and releases it when needed. The heat transfer oil circulation pump 311 transports the low-temperature heat transfer oil to the fin tube heat exchanger 203 through the medium circulation pipeline and exchanges heat with the high-temperature air to generate high-temperature heat transfer oil. The high-temperature heat transfer oil is transported to the heat transfer oil heat unit 310 to meet the production needs.

[0055] The oil-gas separator 313 is used to remove water vapor and air from the oil system. The high and low level tanks 312 are mainly used to store the volume of the heat transfer oil expanded due to the increase in temperature to prevent the pipes and valves in the system from being damaged due to thermal expansion and pressure increase. The nitrogen sealing device 314 mainly serves to isolate and seal the air.

[0056] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail with reference to the preferred embodiments, ordinary technicians in this field should understand that they can still modify or replace the technical solution of the utility model with equivalents, and these modifications or equivalent replacements cannot cause the modified technical solution to deviate from the spirit and scope of the technical solution of the utility model.

Claims

1. A photovoltaic energy storage system for a zero-carbon park, comprising a photovoltaic power generation unit, characterized in that: Also includes A solid energy storage unit is used to store the photovoltaic power generation unit and the electric energy in the valley power stage. The solid energy storage unit is provided with a heat storage brick spacing regulator; Energy output unit, used to supply energy for processing and production in the park; The solid energy storage unit and the photovoltaic power generation unit are both connected to the energy output unit.

2. A photovoltaic energy storage system for a zero-carbon park according to claim 1, characterized in that: The photovoltaic power generation unit includes a photovoltaic panel, an inverter and a photovoltaic grid-connected box. The photovoltaic panel is connected to the photovoltaic grid-connected box through the inverter. The photovoltaic grid-connected box and the mains power distribution station are both connected to the low-voltage distribution cabinet, and the low-voltage distribution cabinet is connected to the power control cabinet.

3. A photovoltaic energy storage system for a zero-carbon park according to claim 2, characterized in that: The solid energy storage unit includes a thermal insulation shell, an electric heating element, a fin-tube heat exchanger and a variable frequency circulation fan. The heat storage bricks are arranged in the thermal insulation shell through a spacing adjuster, the electric heating element is inserted into the heat storage bricks, the outer cover of the heat storage bricks is provided with an insulating heat insulation cover, and ventilation holes are opened on the top of the insulating heat insulation cover. The fin-tube heat exchanger is arranged in the thermal insulation shell, the variable frequency circulation fan is fixed to the side wall of the thermal insulation shell and arranged opposite to the fin-tube heat exchanger, and the variable frequency circulation fan and the electric heating element are connected to the power control cabinet.

4. A photovoltaic energy storage system for a zero-carbon park according to claim 3, characterized in that: The spacing adjuster includes a telescopic support frame, a linkage plate is fixed on one side of the telescopic support frame, one side of the linkage plate is fixedly connected to the telescopic end of the electric telescopic rod, a plurality of upper support rods and a plurality of lower support rods arranged in parallel are fixed on the telescopic support frame, a fixed mesh plate is fixed on the upper support rod, heat storage bricks are arranged on the fixed mesh plate, a support wheel is installed at the bottom of the lower support rod, and the electric telescopic rod is connected to the power control cabinet.

5. The photovoltaic energy storage system for a zero-carbon park according to claim 3, characterized in that: The energy output unit comprises a steam cylinder connected to the fin-tube heat exchanger. A water feed pump is arranged on the connecting pipeline between the water inlet end of the fin-tube heat exchanger and the softening water device. The water feed pump is connected to the power control cabinet.

6. A photovoltaic energy storage system for a zero-carbon park according to claim 3, characterized in that: The energy output unit includes a lithium bromide unit connected to a fin-tube heat exchanger, and a water feed pump is provided on a connecting pipe between a water inlet end of the fin-tube heat exchanger and a softening water device; A plate heat exchanger is arranged between the fin tube heat exchanger and the softening water device, the plate heat exchanger is connected to a fan coil through a pipeline circulation pump, the fan coil is connected to the lithium bromide unit, the lithium bromide unit is connected to a cooling tower, and a cooling circulation pump is arranged on the pipeline between the cooling tower and the lithium bromide unit; The water feed pump, pipeline circulation pump and cooling circulation pump are all connected to the power control cabinet.

7. A photovoltaic energy storage system for a zero-carbon park according to claim 3, characterized in that: The energy output unit includes a heat transfer oil heat unit, an oil-gas separator and a heat transfer oil circulation pump which are connected in sequence. The heat transfer oil circulation pump and the heat transfer oil heat unit are respectively connected to the two ends of the fin tube heat exchanger. The oil-gas separator is connected to a nitrogen sealing device through high and low level tanks.

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