Photovoltaic cell manufacturing heat recovery and application system

Abstract

The utility model discloses a photovoltaic cell manufacturing heat recovery and application system which comprises an air compressor heat recovery system, a conveying and control system and a tail end application heat exchange system. The air compressor heat recovery system recovers compression heat of the centrifugal air compressor, heat energy is transmitted to the tail end application heat exchange system through the conveying system, and water cooled through heat exchange of the tail end application heat exchange system flows back to the air compressor heat recovery system through the conveying system to form a closed loop. The tail end application heat exchange system adopts a cascade heat energy step-by-step descending heat supply design, different cascade heat energy is specifically suitable for the tail end application heat exchange system, the tail end application heat exchange system is suitable for ultrapure water, MAU and raw water heating heat exchangers, hot water obtained after heat exchange is conveyed to different technological links of photovoltaic cell manufacturing, and automatic heat energy cascade application is achieved. The air compressor waste heat recovery device can effectively recover waste heat of the air compressor, achieves full utilization of recovered heat energy, meets the requirement for manufacturing diversified hot water through photovoltaic cells, and achieves energy conservation and carbon reduction.

Description

TECHNICAL FIELD

[0001] The utility model belongs to heat energy recovery application technical field relates to photovoltaic cell manufacturing industry heat energy recovery and application system. BACKGROUND

[0002] In the photovoltaic cell manufacturing process, air compressor and other equipment will produce a large amount of waste heat, the temperature range of these waste heat is usually higher, has higher recycling value. However, the existing waste heat recovery and utilization system has many problems, leading to low waste heat utilization rate, the recovered waste heat cannot be fully utilized, and energy waste is serious. First of all, the existing technology is one-sided in design, usually heat recovery or heat utilization is considered as an independent system, the overall process requirements of photovoltaic cell manufacturing are not fully considered, which limits the integrity of the waste heat recovery and application system, making it difficult to meet the complex heat recovery and heat application scenarios in photovoltaic cell manufacturing. Secondly, the demand for hot water in the photovoltaic cell manufacturing process is large, and the requirements for hot water temperature of different processes are significantly different. The existing waste heat recovery and utilization system often cannot effectively utilize heat energy of different temperature ranges, leading to waste of heat energy at lower temperature ranges after meeting the demand for high-temperature heat energy. For example: although the air compressor waste heat recovery system can recover heat energy, the temperature of its application cannot match the requirements of different processes. In addition, the heat recovery mode of the existing waste heat recovery system is often single, which cannot adapt to various complex heat recovery scenarios, and the waste heat recovery is not sufficient. The existing heat recovery mode not only reduces the efficiency of waste heat recovery, but also limits the full utilization of recovered waste heat in different process sections of the photovoltaic cell manufacturing industry.

[0003] In summary, the existing technology has obvious deficiencies in waste heat recovery and utilization, cannot realize efficient recovery and full utilization of waste heat, and is difficult to meet the complex and variable heat recovery and heat application scenarios in the photovoltaic cell manufacturing industry. Therefore, developing a system that can efficiently recover and flexibly utilize waste heat is of great significance for improving energy utilization efficiency, reducing energy consumption and realizing green and low-carbon photovoltaic cell manufacturing process. UTILITY MODEL CONTENT

[0004] The utility model aims at providing a photovoltaic cell manufacturing heat energy recovery and cascade utilization system, which can efficiently utilize the waste heat generated by the air compressor in photovoltaic cell manufacturing, realize the full utilization of recovered heat energy in different process links of photovoltaic cell manufacturing, meet the diversified hot water demand of photovoltaic cell manufacturing, realize energy saving and carbon reduction, and overcome the shortcomings and deficiencies of the prior art.

[0005] To achieve the above purpose, the utility model adopts the following technical scheme:

[0006] A photovoltaic cell manufacturing heat recovery and application system, comprising: an air compressor heat recovery system, a conveying and control system, and an end application heat exchange system. The air compressor heat recovery system is composed of at least one set of heat recovery units, and each set of heat recovery units comprises at least one air compressor and at least one heat exchanger. The heat exchanger obtains the heat energy of the high-temperature gas discharged by the air compressor. The heat energy is transmitted to the end application heat exchange system by the water in the conveying system. The conveying and control system comprises a cold water line, a hot water line, and a water pump. The cold water line is a cold water conveying pipeline, conveying cold water into the heat exchanger. The water pump on the cold water line provides power for the water circulation in the conveying system. The hot water line is a hot water conveying pipeline, conveying high-temperature hot water into the end application heat exchange system. The end application heat exchange system comprises an application heat exchanger. The water cooled by the end application heat exchange system is returned to the air compressor heat recovery system through the cold water line to form a closed circulation. The end application heat exchange system adopts a step-by-step heat energy descending heat supply design. Different levels of heat energy are applied to the application heat exchanger to achieve the purpose of fully utilizing heat energy resources.

[0007] Further, at least two sets of heat recovery units are connected in parallel to form an air compressor heat recovery system to adapt to complex photovoltaic cell manufacturing heat recovery scenarios.

[0008] Further, the heat exchanger is a high-efficiency gas-liquid heat exchanger. Each set of heat recovery units comprises: a primary air compressor, a secondary air compressor, a tertiary air compressor, a primary high-efficiency gas-liquid heat exchanger, and a secondary high-efficiency gas-liquid heat exchanger. The gas outlet of the primary air compressor is connected to the gas inlet of the secondary air compressor through the primary high-efficiency gas-liquid heat exchanger. The gas outlet of the secondary air compressor is connected to the gas inlet of the tertiary air compressor through the secondary high-efficiency gas-liquid heat exchanger. The heat energy generated by the primary air compressor and the secondary air compressor is transmitted to the water in the conveying and control system through the primary high-efficiency gas-liquid heat exchanger and the secondary high-efficiency gas-liquid heat exchanger.

[0009] Further, six sets of heat recovery units are connected in parallel to form an air compressor heat recovery system to recover the waste heat generated by the air compressor. The hot water after heat exchange in the air compressor heat recovery system enters the conveying and control system.

[0010] Further, the step-by-step heat energy descending heat supply design is realized by using temperature and flow control valves. The temperature and flow control valves are located at the input end of the application heat exchanger to automatically and accurately control the temperature and flow of the water entering the application heat exchanger.

[0011] Further, the end application heat exchange system comprises three application heat exchangers, which are arranged from high to low according to the utilization level of heat energy, i.e. an ultrapure water application heat exchanger, an MAU system heat exchanger, and a raw water heating heat exchanger. The heat energy replaced by the ultrapure water application heat exchanger is used for the etching line and alkali stripping line processes.

[0012] Further, the end application heat exchange system adopts a multi-stage cascade with more than three stages.

[0013] Further, the delivery and control system comprises a hot water line, a cold water line, a water pump, a control cabinet and a control monitoring module, the output end of the cold water line is connected to the cold water input port of the air compressor heat recovery system, and the input end of the cold water line is connected to the water output port of the end application heat exchange system; the input end of the hot water line is connected to the hot water output port of the air compressor heat recovery system, and the output end of the hot water line is connected to the hot water input port of the end application heat exchange system; the water pump is connected in parallel with a standby water pump, and the two water pumps constitute a dual-pump redundancy system, the dual-pump redundancy system is located on the cold water line, and there are pressure transmitters and temperature transmitters on both sides of the cold water line where the dual-pump redundancy system is located to monitor the temperature and pressure changes.

[0014] Further, the input end of the cold water line (8) has a protection system (14) to ensure that the temperature of the water entering the cold water line is less than 35℃.

[0015] Further, the control cabinet (15) is a PLC control cabinet which integrates temperature transmitters, pressure transmitters, water pump control units, air compressor control units, high-efficiency gas-liquid heat exchangers, application heat exchangers, an Ethernet communication RJ45 interface and an MB RTU RS485 communication interface; the control monitoring module (16) edits parameters and programs through an iControl host computer, collects temperature and pressure information from the control cabinet (15), executes programs, issues program instructions, and controls the water pump, air compressors, high-efficiency gas-liquid heat exchangers, application heat exchangers and temperature control valves in the system to realize full-automatic operation of the system.

[0016] Further, the control cabinet is connected to an Internet of Things monitoring module to realize remote data reading and analysis, a cloud platform for storing and analyzing data, and a remote monitoring interface.

[0017] The beneficial effects of the utility model mainly lie in the following aspects:

[0018] Efficient waste heat recovery: By fully utilizing the waste heat of air compressor gas compression, the heat waste is significantly reduced, and the energy utilization efficiency is improved. Compared with traditional technologies, the technical scheme can realize higher waste heat recovery rate and effectively reduce energy consumption.

[0019] Flexible system design: The heat recovery system can be composed of a single, two or multiple heat recovery units, and the combination mode is flexible and diverse, which can be flexibly configured according to actual needs. This design not only improves the thoroughness of waste heat recovery, but also enhances the adaptability of the system, so that it can meet various complex heat recovery scenes in the photovoltaic cell manufacturing process.

[0020] Targeted heat energy utilization: in the end heat application system, the design concept of step-by-step utilization of gradient heat energy is adopted. According to the difference of heat energy temperature and demand of different processes, targeted matching is carried out, so that the recovered heat energy can be fully utilized, and the energy utilization efficiency is further improved.

[0021] Significant energy saving and carbon reduction effect: as a whole, the utility model realizes automatic control by efficient recovery and full utilization of waste heat, reduces the dependence on external energy, reduces energy consumption and carbon emission, meets the requirements of sustainable development, and has significant economic and social benefits. DRAWINGS

[0022] Figure 1 It is a general schematic diagram of the photovoltaic cell manufacturing heat recovery and application system.

[0023] Figure 2 It is a general schematic diagram of the embodiment 1 of the utility model.

[0024] Figure 3 It is a general schematic diagram of the embodiment 2 of the utility model.

[0025] Figure 4 It is a schematic diagram of a set of air compressor heat recovery unit of the embodiment 2 of the utility model.

[0026] Figure 5 It is a schematic diagram of the conveying and control system of the embodiment 2 of the utility model.

[0027] In the figure:

[0028] 1, primary air compressor; 2, secondary air compressor; 3, tertiary air compressor;

[0029] 4, primary high-efficiency gas-liquid heat exchanger; 5, secondary high-efficiency gas-liquid heat exchanger;

[0030] 6, tertiary heat exchanger; 7, hot water line; 8, cold water line;

[0031] 9, water pump; 10, standby water pump; 11, temperature transmitter; 12, pressure transmitter;

[0032] 13, soft water system; 14, protection system; 15, control cabinet; 16, control monitoring module;

[0033] 17, primary application heat exchanger; 18, secondary application heat exchanger; 19, tertiary application heat exchanger;

[0034] 20, air compressor heat recovery system; 21, conveying and control system; 22, end application heat exchange system;

[0035] 23, heat exchanger for ultrapure water; 24, heat exchanger for MAU system; 25, heat exchanger for raw water heating;

[0036] 26, heat recovery unit; 30, temperature control valve; 31, first-stage temperature control valve; 32, second-stage temperature control valve;

[0037] 33, third-stage temperature control valve; 34, air inlet pretreatment module; 35, air compressor temperature transmitter;

[0038] 36, air compressor temperature control valve; 37, protection heat exchanger temperature control valve. DETAILED DESCRIPTION

[0039] In order to make the purpose, technical scheme and beneficial effects of the utility model clearer and more apparent, the utility model will be further described in detail below in combination with the drawings and examples. It should be understood that: the specific examples described here are only used to explain the utility model, and are not used to limit the utility model.

[0040] A photovoltaic cell manufacturing heat recovery and application system, as shown in Figure 1 The air compressor heat recovery system 20 is composed of a group of heat recovery units, and the group of heat recovery units comprises a first-stage air compressor 1 and a first-stage high-efficiency gas-liquid heat exchanger 4. The first-stage high-efficiency gas-liquid heat exchanger 4 obtains the heat energy of the high-temperature gas discharged by the first-stage air compressor 1. The hot water carrying the heat energy enters the conveying and control system 21, and further transmits the heat energy to the terminal application heat exchange system 22. The conveying and control system 21 comprises a hot water line 7, a cold water line 8, a water pump 9, a temperature transmitter 11, a pressure transmitter 12 and a control cabinet 15. The cold water line 8 is provided with the water pump 9 to provide power for water circulation in the conveying system. The water cooled by the terminal application heat exchange system 22 is returned to the air compressor heat recovery system 20 through the cold water line 8 of the conveying and control system 21 to form a closed circulation. The control cabinet 15 integrates the temperature transmitter, the pressure transmitter, the water pump control unit, the air compressor and the heat exchanger control unit, and is connected to the control monitoring module 16. The control cabinet 15 collects the temperature and pressure information collected by the temperature transmitter and the pressure transmitter, and transmits the parameters and programs set in advance by the control monitoring module 16 to the control cabinet 15. The control cabinet 15 executes the set programs and sends program instructions to realize the control of the water pump 9, the first-stage air compressor 1, the first-stage high-efficiency gas-liquid heat exchanger 4 and the temperature control valve 30. The terminal application heat exchange system 22 adopts a heat energy step-down heating design. Different levels of heat energy are applied to the heat exchanger to achieve the purpose of fully utilizing heat energy resources. Figure 1As shown, the hot water delivered by the hot water line 7 first enters the primary application heat exchanger, which replaces high-level thermal energy. The cooled water flows out of the primary application heat exchanger, enters the secondary application heat exchanger through the temperature control valve 30, and the low-temperature water after the secondary application heat exchanger replaces low-level thermal energy reenters the cold water line 8. The temperature control valve 30 can control the water temperature and flow entering the secondary application heat exchanger.

[0041] Embodiment 1 shows a photovoltaic cell manufacturing heat recovery and application system, as shown in Figure 2 As shown, it includes: air compressor heat recovery system 20, delivery and control system 21, end application heat exchange system 22.

[0042] The air compressor heat recovery system 20 is composed of a group of heat recovery units, as shown in Figure 2 As shown: a group of heat recovery units includes: a primary air compressor 1, a secondary air compressor 2, a tertiary air compressor 3, a primary high-efficiency gas-liquid heat exchanger 4, and a secondary high-efficiency gas-liquid heat exchanger 5. The gas outlet of the primary air compressor 1 is communicated with the gas inlet of the secondary air compressor 2 after heat exchange through the primary high-efficiency gas-liquid heat exchanger 4. The gas outlet of the secondary air compressor 2 is communicated with the gas inlet of the tertiary air compressor 3 after heat exchange through the secondary high-efficiency gas-liquid heat exchanger 5. The gas outlet of the tertiary air compressor 3 is connected to the tertiary heat exchanger 6. After the gas outlet of the tertiary heat exchanger 6 is cooled, it enters the drying equipment, is dried, and is delivered to each gas end of the production workshop. After the compressed air is heat-exchanged through the high-efficiency gas-liquid heat exchanger, the compressed air temperature is reduced to below 40℃ before entering the next stage of compression to meet the safe, efficient, and stable operation of the centrifugal unit. The heat energy generated by the primary air compressor 1 and the secondary air compressor 2 is transferred to the heat delivery medium water after passing through the primary high-efficiency gas-liquid heat exchanger 4 and the secondary high-efficiency gas-liquid heat exchanger 5, and then enters the delivery and control system 21 and the end application heat exchange system 22.

[0043] The end application heat exchange system 22 adopts a three-stage heat energy descending design. Through the temperature control valve that automatically controls the temperature and flow, the temperature and flow of the water entering the application heat exchanger are accurately controlled to realize the step-by-step descending of the gradient heat energy, as shown in Figure 2As shown: The first-stage temperature control valve 31 is installed at the hot water input end of the first-stage application heat exchanger 17. The hot water in the hot water line 7 is divided into two paths by the temperature control valve 31. One path enters the first-stage application heat exchanger 17, and the other path, together with the medium-temperature water cooled by the first-stage application heat exchanger 17, flows to the second-stage temperature control valve 32. The second-stage temperature control valve 32 is installed at the input end of the second-stage application heat exchanger 18. The medium-temperature water is divided into two paths by the temperature control valve 32. One path enters the second-stage application heat exchanger 18, and the other path, together with the warm water cooled by the second-stage application heat exchanger 18, flows to the third-stage temperature control valve 33. The third-stage temperature control valve 33 is installed at the input end of the third-stage application heat exchanger 19. The warm water is divided into two paths by the temperature control valve 33. One path enters the third-stage application heat exchanger 19, and the other path, together with the water cooled by the third-stage application heat exchanger 19, flows into the cold water line 8. By setting three different temperatures through the temperature control valves, the temperature and flow rate of the water entering the terminal application heat exchanger are precisely controlled.

[0044] Conveying and control system 21, such as Figure 2 As shown, it includes: a hot water line 7, a cold water line 8, a water pump 9 for providing power, a protection system 14, and a control cabinet 15; the output end of the cold water line 8 is connected to the cold water inlet of the air compressor heat recovery system 20, and the input end of the cold water line 8 is connected to the protection system to ensure that the temperature of the water entering the cold water line is <35℃; the water inlet of the protection system 14 is connected to the water outlet of the terminal application heat exchange system 22; the input end of the hot water line 7 is connected to the hot water outlet of the air compressor heat recovery system 20, and the output end of the hot water line 7 is connected to the hot water inlet of the terminal application heat exchange system 22; the water pump 9 is connected in parallel with a standby water pump 10, and the two water pumps, one for standby and one for use, constitute a dual-pump redundancy system, which is located in the cold water... On line 8, pressure transmitters 12 and temperature transmitters 11 are located on both sides of the cold water line 8 where the dual-pump redundant system is located. These transmitters monitor temperature and pressure changes and send temperature and pressure information to control cabinet 15. Control cabinet 15 integrates: temperature transmitters, pressure transmitters, temperature control valves at all levels, water pump control units, air compressors at all levels, high-efficiency gas-liquid heat exchangers at all levels, and application heat exchanger control units at all levels. Control cabinet 15 is connected to control and monitoring module 16. Control and monitoring module 16 sets parameters and programs, and control cabinet 15 executes programs and sends program instructions to control the water pumps, air compressors at all levels, high-efficiency gas-liquid heat exchangers at all levels, application heat exchangers at all levels, and temperature control valves at all levels in the system, thereby achieving fully automatic operation of the system.

[0045] Example 2 illustrates a photovoltaic cell manufacturing heat recovery and application system, such as... Figure 3 As shown, it includes: an air compressor heat recovery system 20, a conveying and control system 21, and a terminal application heat exchange system 22.

[0046] like Figure 3As shown, the air compressor heat recovery system 20 consists of six heat recovery units 26 connected in parallel to form one air compressor heat recovery system 20. Each heat recovery unit 26 has a first-stage high-efficiency gas-liquid heat exchanger that recovers high-temperature heat energy from the first-stage air compressor, and a second-stage high-efficiency gas-liquid heat exchanger that recovers high-temperature heat energy from the second-stage air compressor. The heat exchange produces 75-95℃ high-temperature hot water, which is then collected and enters the conveying and control system 21. After passing through the high-efficiency gas-liquid heat exchanger, the compressed air temperature drops to below 40℃ before entering the next stage of compression, ensuring the safe, efficient, and stable operation of the centrifugal chiller unit. To ensure air cleanliness, such as... Figure 4 As shown, the air inlet of the heat recovery unit is also equipped with an air pretreatment module 34, whose outlet is connected to the air inlet of the first-stage air compressor 1. This module includes a precision filter with a filtration accuracy ≤5μm and a differential pressure sensor that triggers an alarm with a differential pressure ≥500Pa. To achieve monitoring and control of the temperature of each stage of the high-efficiency gas-liquid heat exchanger and the water, such as... Figure 4 As shown, the inlet of the first-stage high-efficiency gas-liquid heat exchanger 4 is equipped with an air compressor temperature control valve 36, and the outlet is equipped with an air compressor temperature transmitter 35. The inlet and outlet of the second-stage high-efficiency gas-liquid heat exchanger 5 are equipped with the same temperature control valve and temperature transmitter.

[0047] like Figure 3 As shown, the terminal application heat exchange system includes an ultrapure water application heat exchanger 23, an MAU system heat exchanger 24, and a raw water heating heat exchanger 25, connected according to heat energy grade:

[0048] Primary heat energy (85±10℃): is delivered to the primary application heat exchanger, which consists of 8 parallel ultrapure water application heat exchangers 23, for the production of yarn and alkali polishing processes.

[0049] Secondary heat energy (65±5℃): delivered to the secondary application heat exchanger, which is the MAU system heat exchanger 24;

[0050] Third-stage heat energy (50±5℃): delivered to the third-stage application heat exchanger, which is the raw water heating heat exchanger 25.

[0051] like Figure 5As shown, the delivery and control system 21 includes: hot water line 7, cold water line 8, a double pump redundancy system for providing delivery power, soft water system 13, protection system 14, control cabinet 15 and control monitoring module 16; the output end of the cold water line 8 is connected to the cold water input port of the air compressor heat recovery system 20, the input end of the cold water line 8 is connected to the protection system 14, which ensures that the temperature of the water entering the cold water line is <35℃, the water input port of the protection system 14 is connected to the water output port of the end application heat exchange system 22; the input end of the hot water line 7 is connected to the hot water output port of the air compressor heat recovery system 20, and the output end of the hot water line 7 is connected to the hot water input port of the end application heat exchange system 22; the delivery pipeline of the hot water line 7 is composed of S304 stainless steel heat preservation pipeline (DN125), aluminum outer skin or PVC pipe piece protection; the double pump redundancy system includes one water pump 9 and one standby water pump 10, and the double pump redundancy system is arranged on the cold water line 8, and pressure transmitters 12 are arranged on both sides of the cold water line 8 where the double pump redundancy system is arranged, and a temperature transmitter 11 is arranged at the water outflow section of the double pump redundancy system, so as to monitor the temperature and pressure changes, and the two water pumps are used alternately, and the fault is automatically alarmed; the soft water system 13 is arranged on the cold water line between the double pump redundancy system and the protection system 14, and the soft water system 13 is a deionized water treatment device, which includes an ion exchange resin tank and an electronic descaling instrument, and maintains the water conductivity ≤10 μS / cm and the hardness ≤0.03 mmol / L, and supplies soft water for the cold water line.

[0052] As shown in Figure 3 , the cold water line 8 is provided with two paths to provide sufficient delivery power and soft water supply for the delivery and control system 21.

[0053] As shown in Figure 5 , the protection system 14 is arranged at the input end of the cold water line 8, and includes a plate heat exchanger, a protection heat exchanger temperature control valve 37 and a multi-parameter monitoring module with PLC control, the plate heat exchanger is a bypass type stainless steel plate heat exchanger, which is automatically started when the water temperature ≥35℃ is detected, so as to reduce the water temperature to below 35℃ before entering the cold water line, thereby ensuring that the temperature of the water entering the cold water line is <35℃.

[0054] As shown in Figure 5As shown, the control system comprises a control cabinet 15 and a control monitoring module 16, the control cabinet 15 is a PLC control cabinet, the PLC control cabinet integrates: temperature transmitters, air compressor temperature transmitters, pressure transmitters, air compressor temperature control valves, various stage temperature control valves and water pump control units, various stage air compressors control units, various stage high-efficiency gas-liquid heat exchangers and various stage application heat exchanger control units, soft water systems and protection system control units, Ethernet communication RJ45 interfaces and MB RTU RS485 communication interfaces, the control monitoring module 16 edits parameters and programs through an iControl host computer, and the control cabinet 15 collects temperature, pressure and other parameter information, executes the set programs, issues program instructions, and controls the water pump, various stage air compressors, various stage high-efficiency gas-liquid heat exchangers, various stage application heat exchangers, soft water systems, protection systems and various stage temperature control valves in the control system, so as to realize full-automatic operation of the system.

[0055] The heat application heat exchanger is arranged in a cleaning line of a photovoltaic cell manufacturing process, the compressed heat of the third stage of the centrifugal unit is recovered, the circulating backwater at 30 DEG C is heated to 85 DEG C, and then is delivered to the end cleaning line through a hot water delivery pipeline, so that the ultrapure water originally entering the electric heater is first introduced into the newly added heat application heat exchanger, and the ultrapure water is preheated to more than 65 DEG C, so that the power consumption of the electric heater is reduced, and the expected goal of energy saving and emission reduction is achieved.

[0056] The system is designed to be full-automatic, detects the data such as the inlet and outlet temperatures and pressures of the compressed gas, the inlet and outlet temperatures and pressures of the circulating water, and the real-time and cumulative energy-saving data of the heat application end, so as to facilitate the energy-saving benefit settlement in the future. Meanwhile, the remote data reading of the Internet of Things is additionally arranged, so as to facilitate the management personnel to read the energy-saving amount and the equipment operation condition in real time.

[0057] The above description of the embodiments is for the purpose of facilitating the ordinary skilled person in the art to understand and use the present application. The person skilled in the art can obviously make various modifications to the embodiments, and apply the general principles described herein to other embodiments without creative labor. Therefore, the present application is not limited to the above embodiments, and the improvements and modifications made by the person skilled in the art without departing from the scope of the present application should be within the protection scope of the present application.

Claims

1. A photovoltaic cell manufacturing heat recovery and utilization system, characterized by, The application relates to a heat recovery system for air compressors, a conveying and control system and an end application heat exchange system. The heat recovery system for air compressors is composed of at least one set of heat recovery units, and each set of heat recovery units comprises at least one air compressor and at least one heat exchanger. The heat exchanger obtains the heat energy of high-temperature gas discharged by the air compressor, and the heat energy is transmitted to the end application heat exchange system through water in the conveying system. The conveying and control system comprises a cold water line, a hot water line and a water pump. The cold water line is a cold water conveying pipeline, and cold water is conveyed into the heat exchanger. The water pump on the cold water line provides power for water circulation in the conveying system. The hot water line is a hot water conveying pipeline, and high-temperature hot water is conveyed into the end application heat exchange system. The end application heat exchange system comprises an application heat exchanger. The water cooled through the end application heat exchange system is returned to the heat recovery system for air compressors through the cold water line to form a closed circulation. The end application heat exchange system adopts a step-by-step heat energy descending heat supply design. Different steps of heat energy are applied to the application heat exchanger to achieve the purpose of fully utilizing heat energy resources.

2. The photovoltaic cell manufacturing heat recovery and utilization system of claim 1, wherein, At least two sets of the heat recovery units are connected in parallel to form the heat recovery system for air compressors to adapt to complex photovoltaic cell manufacturing heat recovery scenes.

3. The photovoltaic cell manufacturing heat recovery and utilization system of claim 1, wherein, The heat exchanger is a high-efficiency gas-liquid heat exchanger. Each set of the heat recovery units comprises a first-stage air compressor (1), a second-stage air compressor (2), a third-stage air compressor (3), a first-stage high-efficiency gas-liquid heat exchanger (4) and a second-stage high-efficiency gas-liquid heat exchanger (5). The gas outlet end of the first-stage air compressor (1) is communicated with the gas inlet end of the second-stage air compressor (2) through the first-stage high-efficiency gas-liquid heat exchanger (4). The gas outlet end of the second-stage air compressor (2) is communicated with the gas inlet end of the third-stage air compressor (3) through the second-stage high-efficiency gas-liquid heat exchanger (5). The heat energy generated by the first-stage air compressor (1) and the second-stage air compressor (2) is transmitted to the heat conveying medium water through the first-stage high-efficiency gas-liquid heat exchanger (4) and the second-stage high-efficiency gas-liquid heat exchanger (5) and then enters the conveying and control system (21).

4. The photovoltaic cell manufacturing heat recovery and utilization system of claim 1, wherein, Six sets of the heat recovery units (26) are connected in parallel to form a heat recovery system for air compressors, and the waste heat generated by the air compressor is recovered. The hot water cooled through the heat recovery system for air compressors enters the conveying and control system (21).

5. The photovoltaic cell manufacturing heat recovery and utilization system of claim 1, wherein, The step-by-step heat energy descending heat supply design is realized by using temperature and flow automatic control valves (30). The temperature and flow automatic control valves (30) are arranged at the input ends of the application heat exchangers to automatically and accurately control the temperature and flow of water entering the application heat exchangers.

6. The photovoltaic cell manufacturing heat recovery and utilization system of claim 5, wherein, The end application heat exchange system (22) comprises three-stage application heat exchangers. According to the utilization of heat energy, the three-stage application heat exchangers are arranged from high to low and comprise an ultrapure water application heat exchanger (23), an MAU system heat exchanger (24) and a raw water heating heat exchanger (25). The heat energy replaced by the ultrapure water application heat exchanger (23) is used for the processes of wafering and alkali stripping.

7. The photovoltaic cell manufacturing heat recovery and utilization system of claim 1, wherein, The delivery and control system (21) comprises a hot water line (7), a cold water line (8), a water pump (9), a control cabinet (15) and a control monitoring module (16), the output end of the cold water line (8) is connected with the cold water input port of the air compressor heat recovery system (20), and the input end of the cold water line (8) is connected with the water output port of the terminal application heat exchange system (22); the input end of the hot water line (7) is connected with the hot water output port of the air compressor heat recovery system (20), and the output end of the hot water line (7) is connected with the hot water input port of the terminal application heat exchange system (22); the water pump (9) is connected in parallel with a standby water pump (10), the two water pumps constitute a double-pump redundancy system, the double-pump redundancy system is located on the cold water line (8), and the pressure transmitter (12) and the temperature transmitter (11) are arranged on the two sides of the cold water line (8) where the double-pump redundancy system is located, so that the temperature and pressure changes are monitored.

8. The photovoltaic cell manufacturing heat recovery and utilization system of claim 7, wherein, The input end of the cold water line (8) is provided with a protection system (14), so that the temperature of the water entering the cold water line is less than 35 DEG C.

9. A photovoltaic cell manufacturing heat recovery and utilization system according to claim 8, wherein, The control cabinet (15) is a PLC control cabinet, the PLC control cabinet is integrated with a temperature transmitter, a pressure transmitter, water pump control units of various levels, air compressor control units of various levels, high-efficiency gas-liquid heat exchangers of various levels, application heat exchangers of various levels, an Ethernet communication RJ45 interface and an MB RTU RS485 communication interface, the control monitoring module (16) edits parameters and programs through an iControl host computer, collects temperature and pressure information through the control cabinet (15), executes programs, sends program instructions, controls the water pump, air compressors of various levels, high-efficiency gas-liquid heat exchangers of various levels, application heat exchangers of various levels and temperature control valves of various levels in the control system, and realizes full-automatic operation of the system.

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