Nitrogen waste cold recovery device in silicon solar energy industry

Abstract

The utility model discloses a silicon solar energy industry nitrogen residual cold recovery device which comprises a vortex tube, a first three-way valve, a second three-way valve and a heat exchange mechanism, the input end of the vortex tube is communicated with a nitrogen exhaust port of a condensation evaporator in a photovoltaic workshop, and the hot air output end of the vortex tube is communicated with the input end of the first three-way valve. The cold air output end of the vortex tube communicates with the input end of the second three-way valve; the first output end of the first three-way valve and the first output end of the second three-way valve are both connected with gas discharge ends, and the second output end of the first three-way valve and the second output end of the second three-way valve are both communicated with the heat exchange mechanism. Nitrogen in a silicon solar crystal pulling and slicing manufacturing section is collected in a centralized mode and sequentially passes through the vortex tube and the heat exchange mechanism, energy recovery is achieved, the problem that in the prior art, resources are wasted due to direct nitrogen discharging is solved, and recycling of the resources is facilitated.

Description

Technical Field

[0001] This utility model belongs to the field of photovoltaic equipment technology, specifically relating to a nitrogen waste cooling recovery device for the silicon solar energy industry. Background Technology

[0002] Crystal pulling is a crucial step in chip manufacturing. The process involves placing high-purity polycrystalline silicon in a sealed crucible, purging the air with argon gas, and then heating the polycrystalline silicon to 1420 degrees Celsius to melt it, forming liquid silicon. A long strip of single-crystal silicon seed is then brought into contact with the liquid surface and slowly pulled upwards while rotating to form a cylindrical silicon rod. In actual production, a crystal pulling furnace is used. The control of the protective gas within the furnace directly affects the quality of the finished product, making its control extremely important. Nitrogen is commonly used as a protective gas to isolate the molten silicon from harmful gases such as oxygen and water vapor in the air, preventing oxidation of the silicon at high temperatures. Oxidation introduces impurities into the silicon, affecting the purity and quality of the single-crystal silicon. Atmosphere control: In the Czochralski (CZ) method, nitrogen is used to control the atmosphere during the crystal pulling process, ensuring that the molten silicon cools in an oxygen-free or low-oxygen environment. This helps improve the crystal quality and crystal structure of the single-crystal silicon. Cooling assistance: Nitrogen has a lower thermal conductivity than argon, so it can be used as a cooling medium in some crystal pulling processes to help rapidly cool molten silicon and promote single crystal growth. Contamination prevention: Nitrogen can also be used to flush and purify crystal pulling equipment, removing air and other gases to prevent contamination of the single crystal silicon during the crystal pulling process. Safety benefits: Nitrogen is an inert gas and non-flammable, thus reducing the risk of fire and explosion during crystal pulling.

[0003] Chinese patent document CN119121374A discloses a nitrogen protection system for crystal pulling and its precise flow control method. The system includes a nitrogen storage device, a first control valve, a second control valve, a third control valve, and a control module. The control module is electrically connected to the first, second, and third control valves. One end of the first control valve is connected to the nitrogen storage device, and the other end is connected to a first air inlet located on one side of the upper end of the auxiliary chamber of the crystal pulling furnace. One end of the second control valve is connected to the nitrogen storage device, and the other end is connected to a second air inlet located at the bottom of the main chamber of the crystal pulling furnace. One end of the third control valve is connected to the nitrogen storage device, and the other end is connected to a third air inlet located on one side of the upper end of the main chamber of the crystal pulling furnace. This invention's nitrogen protection system for crystal pulling and its precise flow control method achieve precise control of the protective gas used in crystal pulling, indirectly improving the quality of the finished crystal product.

[0004] In existing technologies, the nitrogen gas discharged from the condenser evaporator in photovoltaic crystal pulling and slicing workshops is around 10°C and is usually directly released into the atmosphere. The residual cooling of the nitrogen gas is not recycled, resulting in a certain waste of resources and economic losses. Utility Model Content

[0005] The purpose of this invention is to provide a nitrogen waste cooling recovery device for the silicon solar energy industry, which solves the above-mentioned problems existing in the prior art.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a nitrogen waste cooling recovery device for the silicon solar energy industry, comprising a vortex tube, a first three-way valve, a second three-way valve, and a heat exchange mechanism. The input end of the vortex tube is connected to the nitrogen exhaust port of the condenser evaporator in the photovoltaic workshop, the hot gas output end of the vortex tube is connected to the input end of the first three-way valve, and the cold gas output end of the vortex tube is connected to the input end of the second three-way valve. The first output end of the first three-way valve and the first output end of the second three-way valve are both connected to a gas exhaust end, and the second output end of the first three-way valve and the second output end of the second three-way valve are both connected to the heat exchange mechanism. The heat exchange mechanism is used to receive the hot gas delivered by the first three-way valve or the cold gas delivered by the second three-way valve.

[0007] As an optional implementation of the above technical solution, the heat exchange mechanism includes a heat exchange shell, and the heat exchange shell is provided with a first heat exchange channel and a second heat exchange channel capable of heat exchange. The second output end of the first three-way valve and the second output end of the second three-way valve are both connected to the first heat exchange channel, and the second heat exchange channel is provided with a heat exchange medium.

[0008] As an optional implementation of the above technical solution, the first heat exchange channel is provided with a first inlet and a first outlet at both ends, the second output end of the first three-way valve and the second output end of the second three-way valve are both connected to the first inlet, and the first outlet is connected to the atmosphere.

[0009] As an optional implementation of the above technical solution, the two ends of the second heat exchange channel are respectively provided with a second inlet and a second outlet, the second inlet is connected to a heat exchange medium input end, and the second outlet is connected to a cold / hot medium output end.

[0010] As an optional implementation of the above technical solution, the heat exchange medium is water.

[0011] As an optional implementation of the above technical solution, both the first three-way valve and the second three-way valve are electromagnetic control valves.

[0012] As an optional embodiment of the above technical solution, the vortex tube includes a vortex tube body, which is provided with an inlet pipe for inputting gas, a hot end pipe for outputting hot gas, and a cold end pipe for outputting cold gas.

[0013] As an optional implementation of the above technical solution, the surfaces of both the hot end pipe and the cold end pipe are provided with heat insulation material.

[0014] The beneficial effects of this utility model are as follows:

[0015] This invention centrally collects nitrogen gas from the silicon solar cell crystal pulling and slicing process, and then passes it through a vortex tube and a heat exchange mechanism to achieve energy recovery. The hot or cold gas from the vortex tube can exchange heat with the hot and cold water of the air conditioning coil, reducing the power consumption of the air conditioning system. This overcomes the resource waste problem caused by the direct emission of nitrogen gas in the silicon solar cell crystal pulling and slicing workshop in the prior art, and is conducive to realizing resource recycling. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of a nitrogen waste cooling recovery device in one embodiment of this utility model;

[0017] Figure 2 This is a schematic diagram of the vortex tube and heat exchange mechanism in one embodiment of the present invention.

[0018] In the diagram: 1-Vortex tube; 2-First three-way valve; 3-Second three-way valve; 4-Heat exchange mechanism; 5-Condenser evaporator; 6-Heat exchange shell; 7-First heat exchange channel; 8-Second heat exchange channel; 9-Heat exchange medium input end; 10-Cold / hot medium output end; 11-Vortex tube body; 12-Inlet pipe; 13-Hot end pipe; 14-Cold end pipe. Detailed Implementation

[0019] like Figure 1 and Figure 2 As shown, this embodiment provides a nitrogen waste cooling recovery device for the silicon solar energy industry, including a vortex tube 1, a first three-way valve 2, a second three-way valve 3, and a heat exchange mechanism 4. The input end of the vortex tube 1 is connected to the nitrogen outlet of the condenser evaporator 5 in the photovoltaic workshop, and the nitrogen output from the condenser evaporator 5 in the photovoltaic workshop is directly transported to the vortex tube 1.

[0020] The hot gas output end of the vortex tube 1 is connected to the input end of the first three-way valve 2, and the cold gas output end of the vortex tube 1 is connected to the input end of the second three-way valve 3. The first output end of the first three-way valve 2 and the first output end of the second three-way valve 3 are both connected to a gas discharge end. The second output end of the first three-way valve 2 and the second output end of the second three-way valve 3 are both connected to the heat exchange mechanism 4. The heat exchange mechanism 4 is used to receive the hot gas delivered by the first three-way valve 2 or the cold gas delivered by the second three-way valve 3.

[0021] When the first output end of the first three-way valve 2 opens, the second output end of the second three-way valve 3 opens. At this time, the hot air from the vortex tube 1 is discharged into the atmosphere, and the cold air from the vortex tube 1 is delivered to the heat exchange mechanism 4, providing cooling energy to the heat exchange mechanism 4. When the second output end of the first three-way valve 2 opens, the first output end of the second three-way valve 3 opens. At this time, the cold air from the vortex tube 1 is discharged into the atmosphere, and the hot air from the vortex tube 1 is delivered to the heat exchange mechanism 4, providing heating energy to the heat exchange mechanism 4.

[0022] This invention centrally collects nitrogen gas from the silicon solar cell crystal pulling and slicing manufacturing process, and then passes it sequentially through a vortex tube 1 and a heat exchange mechanism 4 to achieve energy recovery. The hot or cold gas in the vortex tube 1 can exchange heat with the hot and cold water of the air conditioning coil, reducing the power consumption of the air conditioning system. This overcomes the resource waste problem caused by the direct emission of nitrogen gas in the silicon solar cell crystal pulling and slicing workshop in the prior art, and is conducive to realizing resource recycling.

[0023] Specifically, the vortex tube 1 includes a vortex tube body 11, which is provided with an inlet pipe 12 for inputting gas, a hot-end pipe 13 for outputting hot gas, and a cold-end pipe 14 for outputting cold gas. Preferably, the surfaces of the hot-end pipe 13 and the cold-end pipe 14 are both provided with heat-insulating material. The inlet pipe 12 is connected to the nitrogen exhaust port of the condenser evaporator 5 in the photovoltaic workshop, and both the hot-end pipe 13 and the cold-end pipe 14 are connected to the heat exchange mechanism 4. According to actual needs, the hot-end pipe 13 or the cold-end pipe 14 is controlled to provide heat energy or cold energy to the heat exchange mechanism 4.

[0024] The heat exchange mechanism 4 includes a heat exchange shell 6, inside which are provided a first heat exchange channel 7 and a second heat exchange channel 8 for heat exchange. The second output end of the first three-way valve 2 and the second output end of the second three-way valve 3 are both connected to the first heat exchange channel 7. The second heat exchange channel 8 contains a heat exchange medium. Preferably, the heat exchange medium is water.

[0025] The first heat exchange channel 7 has a first inlet and a first outlet at its two ends. The second output end of the first three-way valve 2 and the second output end of the second three-way valve 3 are both connected to the first inlet, and the first outlet is connected to the atmosphere. The second heat exchange channel 8 has a second inlet and a second outlet at its two ends. The second inlet is connected to a heat exchange medium input end 9, and the second outlet is connected to a cold / hot medium output end 10. Both the first three-way valve 2 and the second three-way valve 3 are electromagnetic control valves, which can achieve automatic control.

[0026] The technical solution adopted in this utility model is:

[0027] (1) Collect the nitrogen waste gas emitted by the condenser 5 in the photovoltaic workshop;

[0028] (2) Nitrogen gas passes through vortex tube 1 for further cooling, producing -20°C cold gas and 100°C hot gas;

[0029] (3) Cold air and hot air are respectively connected to heat exchange mechanism 4, and the valves are switched according to the season. Cold air is provided in summer and hot air is provided in winter.

[0030] (5) The cold / hot air provided by the vortex tube 1 enters the heat exchange mechanism 4 and exchanges heat with the cold and hot water of the air conditioning coil to be used for office air conditioning heating / cooling.

[0031] This invention provides a centralized collection of nitrogen waste gas from the silicon solar cell crystal pulling and slicing manufacturing process. The nitrogen waste gas passes through a vortex tube 1 and a heat exchange mechanism 4 in sequence, allowing for the reuse of its cold energy. By switching valves, the nitrogen can be used to provide heating / cooling for office air conditioning, reducing electricity costs in winter and summer.

[0032] In this description of the utility model, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. They can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art will understand the specific meanings of these terms in this utility model. Furthermore, the specific features and structures described in the embodiments are included in at least one implementation method. Those skilled in the art can combine features from different implementation methods without contradiction. The scope of protection of this utility model is not limited to the specific implementation methods described above. Based on the basic technical concept of this utility model, implementation methods that can be conceived by those skilled in the art without creative effort are all within the scope of protection of this utility model.

Claims

1. A device for recovering nitrogen excess cooling in the silicon solar industry, characterized by, The application relates to a nitrogen gas recycling device for a photovoltaic workshop, which comprises a vortex tube (1), a first three-way valve (2), a second three-way valve (3) and a heat exchange mechanism (4), the input end of the vortex tube (1) is communicated with the nitrogen gas discharge port of a condenser evaporator (5) in the photovoltaic workshop, the hot gas output end of the vortex tube (1) is communicated with the input end of the first three-way valve (2), and the cold gas output end of the vortex tube (1) is communicated with the input end of the second three-way valve (3); the first output end of the first three-way valve (2) and the first output end of the second three-way valve (3) are both connected with a gas discharge end, the second output end of the first three-way valve (2) and the second output end of the second three-way valve (3) are both communicated with the heat exchange mechanism (4), and the heat exchange mechanism (4) is used for receiving the hot gas delivered by the first three-way valve (2) or the cold gas delivered by the second three-way valve (3).

2. The silicon solar industry nitrogen overcooling recovery device according to claim 1, characterized in that, The heat exchange mechanism (4) comprises a heat exchange shell (6), the heat exchange shell (6) is internally provided with a first heat exchange channel (7) and a second heat exchange channel (8) capable of heat exchange, the second output end of the first three-way valve (2) and the second output end of the second three-way valve (3) are both communicated with the first heat exchange channel (7), and the second heat exchange channel (8) is internally provided with a heat exchange medium.

3. The silicon solar industry nitrogen overcooling recovery device according to claim 2, characterized in that, The two ends of the first heat exchange channel (7) are respectively provided with a first inlet and a first outlet, the second output end of the first three-way valve (2) and the second output end of the second three-way valve (3) are both communicated with the first inlet, and the first outlet is communicated with the atmosphere.

4. The silicon solar industry nitrogen overcooling recovery device according to claim 3, characterized in that, The two ends of the second heat exchange channel (8) are respectively provided with a second inlet and a second outlet, the second inlet is connected with a heat exchange medium input end (9), and the second outlet is connected with a cold / heat medium output end (10).

5. The silicon solar industry nitrogen overcooling recovery device according to claim 4, characterized in that, The heat exchange medium is water.

6. The silicon solar industry nitrogen overcooling recovery apparatus according to claim 1, characterized in that, The first three-way valve (2) and the second three-way valve (3) are both electromagnetic control valves.

7. The silicon solar industry nitrogen overcooling recovery apparatus according to claim 1, characterized in that, The vortex tube (1) comprises a vortex tube body (11), the vortex tube body (11) is provided with an air inlet pipe (12) for inputting gas, a hot end pipe (13) for outputting hot gas and a cold end pipe (14) for outputting cold gas.

8. The silicon solar industry nitrogen overcooling recovery device according to claim 7, characterized in that, The surfaces of the hot end pipe (13) and the cold end pipe (14) are both provided with heat insulation materials.

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