Solar cell production system

Abstract

The utility model relates to the technical field of solar cell production lines, in particular to a solar cell production system which comprises wet process equipment, a heat exchange device and heating equipment. The wet apparatus has a wet process tank configured to process the solar cell using a process fluid and produce a waste fluid having a second temperature. The heat exchange device is provided with a first heat exchange channel and a second heat exchange channel which are independent from each other; the first heat exchange channel is configured to convey replenishing liquid to be heated; the second heat exchange channel is communicated with the wet process tank, and the second heat exchange channel is configured to contain waste liquid generated by the wet process tank and heat the replenishing liquid in the first heat exchange channel to a third temperature through the waste liquid. One end of the heating equipment is communicated with the first heat exchange channel, and the other end of the heating equipment is communicated with the wet process tank; and the heating equipment is configured to heat the replenisher discharged from the first heat exchange channel from the third temperature to the fourth temperature and output the replenisher with the fourth temperature to the wet process tank.

Description

Technical Field

[0001] The present application relates to the technical field of solar cell production lines, and in particular to a solar cell production system. Background Art

[0002] When producing solar cells, the solar cell production line needs to add liquid of the required process temperature to the wet process equipment according to the process requirements to perform the corresponding wet process. The process of heating the liquid from room temperature to the required process temperature consumes a lot of energy. After a certain number of wet processes, the high-temperature waste liquid in the wet process equipment will be directly discharged. For the next wet process, new liquid needs to be added to the wet process equipment, and the above heating process needs to be repeated to heat the newly added liquid from room temperature to the required process temperature, resulting in high energy consumption in the wet process of the solar cell production line. Utility Model Content

[0003] The embodiment of the present application discloses a solar cell production system, which can reduce the energy consumption of a solar cell production line in a wet process.

[0004] In order to achieve the above objectives, in a first aspect, the present application discloses a solar cell production system, comprising:

[0005] A wet process device having a wet process tank configured to process a solar cell using a process liquid having a first temperature and to generate a waste liquid having a second temperature; wherein the second temperature is lower than or equal to the first temperature;

[0006] a heat exchange device, the heat exchange device having a first heat exchange channel and a second heat exchange channel independent of each other; the first heat exchange channel is configured to transport a replenishing liquid to be heated; the second heat exchange channel is connected to the wet process tank, the second heat exchange channel is configured to accommodate the waste liquid generated by the wet process tank and heat the replenishing liquid in the first heat exchange channel to a third temperature through the waste liquid, the third temperature being lower than the first temperature; and

[0007] A heating device, one end of which is connected to the first heat exchange channel, and the other end of which is connected to the wet process tank; the heating device is configured to heat the replenishing liquid discharged from the first heat exchange channel from the third temperature to a fourth temperature, and output the replenishing liquid with the fourth temperature to the wet process tank; wherein the temperature difference between the fourth temperature and the first temperature is less than the temperature difference between the third temperature and the first temperature.

[0008] In a possible implementation of the first aspect, the solar cell production system further includes:

[0009] a first pipeline, through which the wet process tank is connected to one end of the heating device;

[0010] a first valve, the first valve being arranged on the first pipeline to control the inflow amount of the supplementary liquid in the first pipeline;

[0011] a second pipe, the wet process tank is further connected to the second pipe; the second pipe is configured to transport the replenishing liquid having a fifth temperature, the fifth temperature being lower than the first temperature;

[0012] a second valve, the second valve being disposed on the second pipeline to control the inflow amount of the supplementary liquid in the second pipeline; and

[0013] A heating element is disposed in the wet process equipment, and is configured to heat the processing liquid in the wet process tank to the first temperature.

[0014] In a possible implementation of the first aspect, the number of the wet process equipment, the first pipeline, the first valve, the second pipeline, the second valve, and the heating element are all multiple, the number of the heating device is one, and the number of the heating device is one;

[0015] The wet process tanks of the respective wet process equipment are connected to the heating equipment through the respective first pipelines;

[0016] Each of the first valves is respectively arranged on each of the first pipelines;

[0017] The wet process tanks of the respective wet process equipment are also connected to the second pipelines respectively;

[0018] Each of the second valves is respectively arranged on each of the second pipelines;

[0019] Each of the heating elements is arranged in each of the wet process equipment.

[0020] In a possible implementation manner of the first aspect, the first valve and / or the second valve is a pneumatic valve.

[0021] In a possible implementation of the first aspect, the heat exchange device includes:

[0022] a liquid storage container, the second heat exchange channel being formed inside the liquid storage container, the liquid storage container being configured to store the waste liquid in the second heat exchange channel; and

[0023] A heat exchange tube is arranged in the second heat exchange channel so that the waste liquid in the second heat exchange channel immerses the heat exchange tube; the first heat exchange channel is formed in the heat exchange tube.

[0024] In a possible implementation of the first aspect, the heat exchange device further includes:

[0025] a third pipeline, two ends of which are respectively connected to the wet process tank and the second heat exchange channel, so as to transport the waste liquid generated by the wet process tank to the second heat exchange channel;

[0026] a third valve, the third valve being disposed on the third pipeline to control the on-off of the third pipeline; and

[0027] A fourth pipeline, one end of which is connected to the second heat exchange channel to discharge the waste liquid after heat exchange in the second heat exchange channel.

[0028] In a possible implementation of the first aspect, one end of the third pipe is connected to the top of the second heat exchange channel;

[0029] One end of the fourth pipe is connected to the bottom of the second heat exchange channel.

[0030] In a possible implementation manner of the first aspect, the heat exchange tube is a polypropylene tube or a polyvinylidene fluoride tube.

[0031] In a possible implementation of the first aspect, the wet process equipment further includes a liquid level sensor, and the liquid level sensor is disposed in the wet process tank to sense the liquid level of the processing liquid in the wet process tank.

[0032] In a possible implementation of the first aspect, the wet process equipment is selected from at least one of a pre-cleaning equipment, a texturing equipment, an alkali washing equipment and a slow pulling equipment.

[0033] In a possible implementation of the first aspect, the number of the wet process equipment is four, and the four wet process equipment are the pre-cleaning equipment, the texturing equipment, the alkali washing equipment and the slow pulling equipment;

[0034] The solar cell production system also includes a first water washing device, a second water washing device, a third water washing device, an acid washing device, a fourth water washing device and a drying device;

[0035] The pre-cleaning equipment, the first water washing equipment, the texturing equipment, the second water washing equipment, the alkali washing equipment, the third water washing equipment, the acid washing equipment, the fourth water washing equipment, the slow pulling equipment and the drying equipment are arranged in sequence.

[0036] Compared with the prior art, the beneficial effect of the present application is that the solar cell production system uses the waste heat of the waste liquid output from the wet process tank to preheat the replenishing liquid, and then transports the replenishing liquid to the heating device for further heating before outputting it to the wet process tank. On the one hand, by recovering the waste heat of the waste liquid, the energy required for heating the replenishing liquid is reduced, thereby reducing the energy consumption of the wet process. Compared with the method of using a heat exchange medium to perform heat exchange between the waste liquid and the replenishing liquid, the waste heat recovery efficiency of the present application is higher. On the other hand, the replenishing liquid added to the wet process tank can maintain the liquid level in the wet process tank, avoiding the low liquid level of the wet process tank due to the discharge of waste liquid. On the other hand, the replenishing liquid is heated from the third temperature to the fourth temperature by the heating device, and the temperature difference between the fourth temperature and the first temperature is less than the temperature difference between the third temperature and the first temperature. In other words, after the replenishing liquid at the fourth temperature is added to the wet process tank, the temperature fluctuation of the processing liquid in the wet process tank is smaller, which is conducive to reducing the impact of adding the replenishing liquid on the wet process. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0038] Figure 1 A schematic diagram of the structure of a solar cell production system disclosed in an embodiment of the present application;

[0039] Figure 2 Another structural schematic diagram of a solar cell production system disclosed in an embodiment of the present application;

[0040] Figure 3 is a front view of the heat exchange device disclosed in the embodiment of the present application;

[0041] Figure 4 is along Figure 3 A cross-sectional view in the AA direction is shown in FIG.

[0042] Description of reference numerals:

[0043] 100, wet process equipment; 110, wet process tank; 120, second pipeline; 121, second valve; 130, heating element; 140, liquid level sensor; 200, heat exchange device; 210, liquid storage container; 211, second heat exchange channel; 220, heat exchange tube; 221, first heat exchange channel; 230, third pipeline; 231, third valve; 240, fourth pipeline; 300, heating equipment; 310, first pipeline; 311, first valve; 400, first water washing equipment; 500, second water washing equipment; 600, third water washing equipment; 700, pickling equipment; 800, fourth water washing equipment; 900, drying equipment. DETAILED DESCRIPTION

[0044] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0045] In this application, the terms "upper", "inner", "top", "bottom" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings. These terms are mainly used to better describe the present application and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation.

[0046] In addition, some of the above terms may be used to express other meanings in addition to indicating orientation or positional relationship. For example, the term "on" may also be used to express a certain dependency or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in this application can be understood according to specific circumstances.

[0047] In addition, the terms "disposed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection, or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, elements, or components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0048] In addition, the terms "first", "second", etc. are mainly used to distinguish different devices, elements or components (the specific types and structures may be the same or different), and are not used to indicate or imply the relative importance and quantity of the indicated devices, elements or components. Unless otherwise specified, "plurality" means two or more.

[0049] The technical solution of the present application will be described below in conjunction with embodiments and drawings.

[0050] The present application embodiment discloses a solar cell production system. Figure 1 The solar cell production system includes a wet process device 100 , a heat exchange device 200 and a heating device 300 .

[0051] The term "wet process equipment 100" refers to equipment used for wet processes in a solar cell production system. The wet processes include but are not limited to pre-cleaning processes, texturing processes, alkaline washing processes, and slow pulling processes. The processing fluids used in the wet processes listed above are generally higher than room temperature and can be used for waste heat recovery. Optionally, the wet process equipment 100 is selected from at least one of pre-cleaning equipment, texturing equipment, alkaline washing equipment, and slow pulling equipment. The waste liquids of the above-mentioned types of wet process equipment 100 can be uniformly collected in the heat exchange device 200 for waste heat recovery.

[0052] The wet process equipment 100 has a wet process tank 110, which is configured to process solar cells using a processing liquid having a first temperature and to generate waste liquid having a second temperature; wherein the second temperature is lower than or equal to the first temperature. The term "processing liquid" refers to the liquid used in the wet process, such as the alkaline liquid used in the pre-cleaning process, the texturing process, and the alkaline washing process, and the neutral liquid used in the slow pulling process. The term "waste liquid" refers to the waste liquid generated after the wet process equipment 100 completes the wet process, such as the waste alkaline liquid generated by the pre-cleaning process, the texturing process, and the alkaline washing process, and the neutral waste liquid generated by the slow pulling process. It can be understood that the waste liquid is formed by the processing liquid after processing, and the temperature of the waste liquid must be equal to or lower than the temperature of the processing liquid, that is, the second temperature is lower than or equal to the first temperature.

[0053] The heat exchange device 200 has a first heat exchange channel 221 and a second heat exchange channel 211 which are independent of each other. Exemplarily, the heat exchange device 200 is selected from any one of a shell and tube heat exchanger, a spiral plate heat exchanger or an immersed heat exchanger.

[0054] The first heat exchange channel 221 is configured to transport the replenishing liquid to be heated. The term "replenishing liquid" refers to a liquid added to the processing liquid. The replenishing liquid is used to prepare the processing liquid and can be directly added to the wet process tank 110. In other words, the replenishing liquid is a component of the processing liquid. For example, if the processing liquid is an alkaline solution or a neutral liquid, the replenishing liquid can be water, preferably pure water. When the processing liquid is a solution, the replenishing liquid can be a solvent of the processing liquid. After the replenishing liquid is added to the wet process tank 110, a corresponding solute, such as an alkali, is added. After the solute is dissolved in the replenishing liquid, a processing liquid of a specific concentration is formed.

[0055] The second heat exchange channel 211 is connected to the wet process tank 110, and the second heat exchange channel 211 is configured to accommodate the waste liquid generated by the wet process tank 110 and heat the supplementary liquid in the first heat exchange channel 221 to a third temperature through the waste liquid. It can be understood that since the temperature of the waste liquid is equal to or lower than the first temperature, the temperature of the supplementary liquid heated by the waste liquid, that is, the third temperature, is lower than the first temperature.

[0056] Directly adding the replenishing liquid at the third temperature to the wet process tank 110 will cause the temperature of the processing liquid in the wet process tank 110 to fluctuate greatly. In order to avoid large temperature fluctuations, the heating device 300 is required to further heat the replenishing liquid so that the temperature of the replenishing liquid is closer to the first temperature. One end of the heating device 300 is connected to the first heat exchange channel 221, and the other end of the heating device 300 is connected to the wet process tank 110. The heating device 300 is configured to heat the replenishing liquid discharged from the first heat exchange channel 221 from the third temperature to the fourth temperature, and output the replenishing liquid with the fourth temperature to the wet process tank 110. Among them, the temperature difference between the fourth temperature and the first temperature is less than the temperature difference between the third temperature and the first temperature. Exemplarily, the first temperature is 75℃~85℃, the third temperature is 45℃~55℃, the temperature difference between the third temperature and the first temperature is 20℃~40℃, the fourth temperature is 80℃, and the temperature difference between the fourth temperature and the first temperature is ±5℃, that is, the temperature difference between the fourth temperature and the first temperature is less than the temperature difference between the third temperature and the first temperature.

[0057] The solar cell production system uses the waste heat of the waste liquid output from the wet process tank 110 to preheat the replenishing liquid, and then transports the replenishing liquid to the heating device 300 for further heating before outputting it to the wet process tank 110. On the one hand, by recovering the waste heat of the waste liquid, the energy required for heating the replenishing liquid is reduced, thereby reducing the energy consumption of the wet process. Compared with the method of using a heat exchange medium to perform heat exchange between the waste liquid and the replenishing liquid, the present application uses waste liquid to directly heat the replenishing liquid, and the waste heat recovery efficiency is higher. On the other hand, the replenishing liquid added to the wet process tank 110 can maintain the liquid level in the wet process tank 110, and avoid the low liquid level of the wet process tank 110 due to the discharge of waste liquid. On the other hand, the replenishing liquid is heated from the third temperature to the fourth temperature by the heating device 300, and the temperature difference between the fourth temperature and the first temperature is less than the temperature difference between the third temperature and the first temperature. In other words, after the replenishing liquid at the fourth temperature is added to the wet process tank 110, the temperature fluctuation of the processing liquid in the wet process tank 110 is smaller, which is conducive to reducing the impact of the addition of the replenishing liquid on the wet process.

[0058] In a possible implementation of the first aspect, see Figure 2 The solar cell production system further includes a first pipeline 310 , a first valve 311 , a second pipeline 120 , a second valve 121 and a heating element 130 .

[0059] The wet process tank 110 is connected to one end of the heating device 300 through the first pipeline 310. The first valve 311 is disposed on the first pipeline 310 to control the inflow amount of the supplementary liquid in the first pipeline 310.

[0060] The wet process tank 110 is also connected to a second pipe 120; the second pipe 120 is configured to transport a replenishing liquid having a fifth temperature, which is lower than the first temperature. A second valve 121 is disposed on the second pipe 120 to control the amount of replenishing liquid in the second pipe 120. Optionally, the second pipe 120 is connected to an external water inlet pipe, and the replenishing liquid at the fifth temperature can be water at room temperature.

[0061] The heating element 130 is disposed in the wet process equipment 100, and the heating element 130 is configured to heat the processing liquid in the wet process tank 110 to a first temperature. Optionally, the heating element 130 is a heating wire with a temperature controller or a heating coil with a temperature controller. The heating element 130 is preferably disposed at the bottom of the wet process tank 110.

[0062] The wet process equipment 100 controls the temperature of the processing liquid in the wet process tank 110 by adjusting the ratio of the inflow amount of two replenishing liquids with different temperatures and heating through the heating element 130. The following are some examples of the temperature control of the processing liquid in the wet process tank 110:

[0063] When the fourth temperature is greater than the first temperature, if only the replenishing liquid with the fourth temperature is input into the wet process tank 110, the processing liquid temperature in the wet process tank 110 may be higher than the first temperature. To this end, the replenishing liquid with the fifth temperature may be input, and the amount of the replenishing liquid with the fourth temperature may be controlled by the first valve 311, and the amount of the replenishing liquid with the fifth temperature may be controlled by the second valve 121, and the ratio of the amount of the replenishing liquid with the two temperatures may be adjusted so that the wet process tank 110 can be kept at the first temperature after the replenishing liquid is added.

[0064] When the fourth temperature is lower than the first temperature, if only the replenishing liquid having the fourth temperature is input into the wet process tank 110, the temperature of the processing liquid in the wet process tank 110 may be lower than the first temperature. To this end, the heating element 130 may be turned on after the replenishing liquid is input, so that the wet process tank 110 can be kept at the first temperature after the replenishing liquid is added.

[0065] When the fourth temperature is equal to the first temperature, only the replenishing liquid with the fourth temperature is input into the wet process tank 110 to maintain the processing liquid in the wet process tank 110 at the first temperature, and the second valve 121 can be closed at this time.

[0066] During the production process, the temperature of the processing liquid in the wet process tank 110 drops due to heat convection between the processing liquid and the external environment. When the temperature is lower than the first temperature, the heating element 130 starts to heat. When the temperature is higher than the first temperature, the heating element 130 stops heating, thereby maintaining the processing liquid in the wet process tank 110 at the first temperature.

[0067] In a possible implementation of the first aspect, see Figure 2 The wet process equipment 100 further includes a liquid level sensor 140, which is disposed in the wet process tank 110 to sense the liquid level of the processing liquid in the wet process tank 110. According to the liquid level signal obtained by the liquid level sensor 140, at least one of the first valve 311, the second valve 121 and the third valve 231 is controlled to maintain the liquid level of the processing liquid in the wet process tank 110 within a suitable range.

[0068] In a possible implementation of the first aspect, see Figure 2 , the number of the wet process equipment 100, the first pipeline 310, the first valve 311, the second pipeline 120, the second valve 121 and the heating element 130 are all multiple, and the number of the heating device 300 is one;

[0069] The wet process tanks 110 of each wet process equipment 100 are connected to the heating equipment 300 through each first pipeline 310;

[0070] Each first valve 311 is respectively disposed on each first pipeline 310;

[0071] The wet process tanks 110 of each wet process equipment 100 are also connected to respective second pipelines 120;

[0072] Each second valve 121 is respectively disposed on each second pipeline 120;

[0073] Each heating element 130 is provided in each wet process apparatus 100 .

[0074] In other words, the present application can supply heated replenishing liquid to multiple wet process equipment 100 at the same time through a heating device 300, thereby saving the equipment cost of the heating device 300. However, the temperature of the replenishing liquid output by a heating device 300 is often a single temperature, and the processing liquid with the first temperature can be a processing liquid with different temperatures between different wet process equipment 100. Exemplarily, when the wet process equipment 100 is a pre-cleaning device, the processing liquid with the first temperature is an alkaline solution of 70°C; when the wet process equipment 100 is a texturing device, the processing liquid with the first temperature is an alkaline solution of 82°C; when the wet process equipment 100 is an alkaline washing device, the processing liquid with the first temperature is an alkaline solution of 70°C; when the wet process equipment 100 is a slow pulling device, the processing liquid with the first temperature is a neutral liquid of 75°C, and the heating device 300 is selected to output a replenishing liquid of 80°C. When a replenishing liquid with a single temperature is added to the wet process tank 110 of each wet process equipment 100, the temperature of the processing liquid in the individual wet process equipment 100 will deviate from the first temperature, or be higher than the first temperature, or be lower than the first temperature. To avoid the above situation, when the temperature of the processing liquid is higher than the first temperature after the replenishing liquid is added to the processing liquid, the inflow amount of the replenishing liquid with a fifth temperature is controlled by the second valve 121 to reduce the temperature of the processing liquid to the first temperature. When the temperature of the processing liquid is lower than the first temperature after the replenishing liquid is added to the processing liquid, the processing liquid is heated to the first temperature by the heating element 130. Through the above arrangement, when the replenishing liquid is supplied to multiple wet process equipment 100 through one heating device 300, the replenishing liquid in each wet process equipment 100 can still be maintained at the first temperature.

[0075] Preferably, the first valve 311 and / or the second valve 121 is a pneumatic valve, and the liquid intake amount is controlled by the duration of the pneumatic valve pulse signal.

[0076] In a possible implementation of the first aspect, see Figure 2 The number of the wet process equipment 100 is four, and the four wet process equipment 100 are respectively a pre-cleaning equipment, a texturing equipment, an alkali washing equipment and a slow pulling equipment.

[0077] The solar cell production system further includes a first water washing device 400 , a second water washing device 500 , a third water washing device 600 , an acid washing device 700 , a fourth water washing device 800 and a drying device 900 .

[0078] A pre-cleaning device, a first washing device 400, a texturing device, a second washing device 500, an alkali washing device, a third washing device 600, an acid washing device 700, a fourth washing device 800, a slow pulling device and a drying device 900 are sequentially arranged. Specifically, along Figure 1 The X direction in is set sequentially.

[0079] The solar cells Figure 1In the X direction, the textile fiber passes through the pre-cleaning equipment, the first water washing equipment 400, the texturing equipment, the second water washing equipment 500, the alkali washing equipment, the third water washing equipment 600, the acid washing equipment 700, the fourth water washing equipment 800, the slow pulling equipment and the drying equipment 900 in sequence to complete each production step.

[0080] In a possible implementation of the first aspect, see Figure 1 , Figure 3 and Figure 4 The heat exchange device 200 includes a liquid storage container 210 and a heat exchange tube 220. The second heat exchange channel 211 is formed inside the liquid storage container 210. The liquid storage container 210 is configured to store waste liquid in the second heat exchange channel 211. Optionally, the liquid storage container 210 is a liquid storage tank. The heat exchange tube 220 is arranged in the second heat exchange channel 211 so that the waste liquid in the second heat exchange channel 211 immerses the heat exchange tube 220. The first heat exchange channel 221 is formed in the heat exchange tube 220, that is, the first heat exchange channel 221 is a cavity in the pipe. By immersing the heat exchange tube 220 in the waste liquid, all parts of the heat exchange tube 220 can contact the waste liquid to fully exchange heat.

[0081] In a possible implementation of the first aspect, see Figure 1 The heat exchange device 200 further includes a third pipe 230, a third valve 231 and a fourth pipe 240. The two ends of the third pipe 230 are respectively connected to the wet process tank 110 and the second heat exchange channel 211 to transport the waste liquid generated by the wet process tank 110 to the second heat exchange channel 211. The third valve 231 is arranged on the third pipe 230 to control the on-off of the third pipe 230. When the wet process tank 110 needs to discharge the waste liquid for heat exchange, the third valve 231 is opened. When the wet process tank 110 stops discharging the waste liquid, the third valve 231 is closed. Preferably, the third valve 231 is a pneumatic valve. One end of the fourth pipe 240 is connected to the second heat exchange channel 211 to discharge the waste liquid after heat exchange in the second heat exchange channel 211.

[0082] In a possible implementation of the first aspect, see Figure 1 , Figure 3 and Figure 4 One end of the third pipe 230 is connected to the top of the second heat exchange channel 211. One end of the fourth pipe 240 is connected to the bottom of the second heat exchange channel 211. The heat exchange device 200 adopts top liquid inlet and bottom liquid discharge, which, on the one hand, allows the waste liquid to flow smoothly and avoid backflow; on the other hand, it allows the waste liquid to flow quickly for heat exchange to heat the supplementary liquid.

[0083] In a possible implementation of the first aspect, the heat exchange tube 220 is a polypropylene tube or a polyvinylidene fluoride tube. The polypropylene tube or the polyvinylidene fluoride tube has the characteristics of corrosion resistance and can withstand the corrosion of high-temperature waste liquid. Optionally, the heat exchange tube 220 is a serpentine tube, which is a pipeline that meanders multiple times in a plane, so that a longer heat exchange tube 220 can be arranged in the liquid storage container 210, thereby having a larger heat exchange area.

[0084] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A solar cell production system, characterized in that: include: A wet process device having a wet process tank configured to process a solar cell using a process liquid having a first temperature and to generate a waste liquid having a second temperature; wherein the second temperature is lower than or equal to the first temperature; a heat exchange device, the heat exchange device having a first heat exchange channel and a second heat exchange channel independent of each other; the first heat exchange channel is configured to transport a replenishing liquid to be heated; the second heat exchange channel is connected to the wet process tank, the second heat exchange channel is configured to accommodate the waste liquid generated by the wet process tank and heat the replenishing liquid in the first heat exchange channel to a third temperature through the waste liquid, the third temperature being lower than the first temperature; and A heating device, one end of which is connected to the first heat exchange channel, and the other end of which is connected to the wet process tank; the heating device is configured to heat the replenishing liquid discharged from the first heat exchange channel from the third temperature to a fourth temperature, and output the replenishing liquid with the fourth temperature to the wet process tank; wherein the temperature difference between the fourth temperature and the first temperature is less than the temperature difference between the third temperature and the first temperature.

2. The solar cell production system according to claim 1, characterized in that: The solar cell production system also includes: a first pipeline, through which the wet process tank is connected to one end of the heating device; a first valve, the first valve being arranged on the first pipeline to control the inflow amount of the supplementary liquid in the first pipeline; a second pipe, the wet process tank is further connected to the second pipe; the second pipe is configured to transport the replenishing liquid having a fifth temperature, the fifth temperature being lower than the first temperature; a second valve, the second valve being disposed on the second pipeline to control the inflow amount of the supplementary liquid in the second pipeline; and A heating element is disposed in the wet process equipment, and is configured to heat the processing liquid in the wet process tank to the first temperature.

3. The solar cell production system according to claim 2, characterized in that: The number of the wet process equipment, the first pipeline, the first valve, the second pipeline, the second valve and the heating element is plural, and the number of the heating equipment is one; The wet process tanks of the respective wet process equipment are connected to the heating equipment through the respective first pipelines; Each of the first valves is respectively arranged on each of the first pipelines; The wet process tanks of the respective wet process equipment are also connected to the second pipelines respectively; Each of the second valves is respectively arranged on each of the second pipelines; Each of the heating elements is arranged in each of the wet process equipment.

4. The solar cell production system according to claim 2, characterized in that: The first valve and / or the second valve is a pneumatic valve.

5. The solar cell production system according to claim 1, characterized in that: The heat exchange device comprises: a liquid storage container, the second heat exchange channel being formed inside the liquid storage container, the liquid storage container being configured to store the waste liquid in the second heat exchange channel; and A heat exchange tube is arranged in the second heat exchange channel so that the waste liquid in the second heat exchange channel immerses the heat exchange tube; the first heat exchange channel is formed in the heat exchange tube.

6. The solar cell production system according to claim 5, characterized in that: The heat exchange device also includes: a third pipeline, two ends of which are respectively connected to the wet process tank and the second heat exchange channel, so as to transport the waste liquid generated by the wet process tank to the second heat exchange channel; a third valve, the third valve being disposed on the third pipeline to control the on-off of the third pipeline; and A fourth pipeline, one end of which is connected to the second heat exchange channel to discharge the waste liquid after heat exchange in the second heat exchange channel.

7. The solar cell production system according to claim 6, characterized in that: One end of the third pipe is connected to the top of the second heat exchange channel; One end of the fourth pipe is connected to the bottom of the second heat exchange channel.

8. The solar cell production system according to any one of claims 5 to 7, characterized in that: The heat exchange tube is a polypropylene tube or a polyvinylidene fluoride tube.

9. The solar cell production system according to any one of claims 1 to 7, characterized in that: The wet process equipment further includes a liquid level sensor, which is disposed in the wet process tank to sense the liquid level of the processing liquid in the wet process tank.

10. The solar cell production system according to any one of claims 1 to 7, characterized in that: The wet process equipment is selected from at least one of pre-cleaning equipment, texturing equipment, alkaline washing equipment and slow pulling equipment.

11. The solar cell production system according to claim 10, characterized in that: The number of the wet process equipment is four, and the four wet process equipment are the pre-cleaning equipment, the texturing equipment, the alkali washing equipment and the slow pulling equipment; The solar cell production system also includes a first water washing device, a second water washing device, a third water washing device, an acid washing device, a fourth water washing device and a drying device; The pre-cleaning equipment, the first water washing equipment, the texturing equipment, the second water washing equipment, the alkali washing equipment, the third water washing equipment, the acid washing equipment, the fourth water washing equipment, the slow pulling equipment and the drying equipment are arranged in sequence.

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