Nitrogen utilization system for nitrogen air release butt air compression

Abstract

The application discloses a nitrogen utilization system for nitrogen air release butt joint air compression used for solar cell processing, which comprises an air separation nitrogen device, an air compressor and a control system; the air outlet end of the air separation nitrogen device is connected with a gas supply main pipeline, an air release pipeline and a switching pipeline respectively; the switching pipeline is provided with a first pressure sensor and a flow regulating valve; the outlet end of the air compressor is connected with an adsorption dryer, the outlet end of the adsorption dryer is connected with a dry tank, and the outlet pipeline of the dry tank is communicated with the switching pipeline; the outlet pipeline of the dry tank is connected with a second pressure sensor; the control system is electrically connected with the first pressure sensor, the second pressure sensor and the flow regulating valve respectively, and is used for receiving the pressure values transmitted by the first pressure sensor and the second pressure sensor and controlling the work of the flow regulating valve. The nitrogen utilization system can realize the reuse of nitrogen, and can reduce the load of the air compressor system.

Description

Technical Field

[0001] This invention relates to the field of solar cell manufacturing technology, and more specifically to a nitrogen utilization system for nitrogen venting and compressed air connection in solar cell processing. Background Technology

[0002] The manufacturing process of monocrystalline silicon solar cells involves six steps: texturing, diffusion, dephosphosilicate glass and back junction, coating, screen printing, and sintering. The diffusion step involves forming the PN junction, the core component of the cell, on the front side of the silicon wafer. When sunlight shines on the semiconductor PN junction, new electron-hole pairs are formed. Under the influence of the PN junction's electric field, holes flow from the N-region to the P-region, and electrons flow from the P-region to the N-region, thus creating a current when the circuit is connected.

[0003] A large amount of nitrogen is required in the diffusion process. Currently, air separation nitrogen generators are commonly used in solar cell production workshops to generate the nitrogen needed for the diffusion process; however, the maximum nitrogen production capacity of air separation nitrogen generators is only 8000 m³ / s. 3 / h, the current maximum nitrogen consumption for production in the workshop is 5000m³. 3 / h, and the extra 3000m 3 / h of gas will be discharged, which will result in a lot of waste.

[0004] Therefore, developing a nitrogen utilization system that can reuse nitrogen and avoid waste for solar cell processing, involving nitrogen venting and compressed air, is a problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0005] In view of this, the present invention provides a nitrogen utilization system for solar cell processing that allows for the reuse of nitrogen gas and avoids waste by venting nitrogen gas into compressed air.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A nitrogen venting and compressed air nitrogen utilization system for solar cell processing includes:

[0008] An air separation nitrogen generator, wherein the outlet of the air separation nitrogen generator is connected to a main gas supply pipeline, a vent pipeline and a transfer pipeline respectively; a first pressure sensor and a flow regulating valve are installed on the transfer pipeline.

[0009] An air compressor is provided, with its outlet end connected to an adsorption dryer. The outlet end of the adsorption dryer is connected to a dry tank, and the outlet pipe of the dry tank is connected to the transfer pipe. A second pressure sensor is connected to the outlet pipe of the dry tank.

[0010] The control system is electrically connected to the first pressure sensor, the second pressure sensor, and the flow regulating valve, and is used to receive the pressure values ​​transmitted by the first pressure sensor and the second pressure sensor, and control the operation of the flow regulating valve.

[0011] The beneficial effect of adopting the above technical solution is that, in addition to being used for battery cell production, the nitrogen generated by the air separation nitrogen generator in this invention can be connected to the outlet pipeline of the air compressor to participate in the operation of the air compressor. This not only enables the utilization of nitrogen but also reduces the workload of the air compressor system.

[0012] Preferably, a first shut-off valve is provided at the end of the transfer pipeline near the air separation nitrogen generator. The first shut-off valve can control the opening and closing of the transfer pipeline.

[0013] Preferably, a second shut-off valve is provided at one end of the transfer pipeline near the outlet pipeline of the dry tank.

[0014] Preferably, a flow meter, a pressure gauge, and a check valve are sequentially installed on the transfer pipeline between the first shut-off valve and the second shut-off valve. The flow meter and pressure gauge can detect the flow rate and pressure of the gas in the transfer pipeline, and the check valve can prevent gas backflow.

[0015] Preferably, the flow meter, flow regulating valve, pressure gauge, first pressure sensor, and check valve are integrated into one unit. Integrating multiple components together facilitates pipeline installation.

[0016] Preferably, the flow meter is an orifice plate flow meter.

[0017] Preferably, the outlet pipe of the dry tank and the transfer pipe are connected to the main gas outlet pipe, and a third pressure sensor is connected to the main gas outlet pipe.

[0018] Preferably, the control system includes: a computing unit and a flow regulating valve controller; the input terminal of the computing unit is electrically connected to a first pressure sensor and a second pressure sensor respectively; the output terminal of the computing unit is electrically connected to the flow regulating valve controller; the flow regulating valve controller is electrically connected to the flow regulating valve and controls the opening and closing size of the flow regulating valve.

[0019] Preferably, the input terminals of the calculation unit are respectively connected to a first transmitter and a second transmitter. The input terminal of the first transmitter is electrically connected to the first pressure sensor, and the input terminal of the second transmitter is electrically connected to the second pressure sensor. The first and second transmitters facilitate the transmission of information from the first and second pressure sensors to the calculation unit for calculating the pressure values ​​in the two pipelines.

[0020] Preferably, the calculation unit includes a differential pressure calculator and a PID controller; the input terminal of the differential pressure calculator is electrically connected to the first transmitter and the second transmitter respectively via an A / D converter; the output terminal of the differential pressure calculator is electrically connected to the PID controller, and the output terminal of the PID controller is electrically connected to the flow control valve controller via a D / A converter. The pressure of the dry tank outlet pipeline and the pressure of the transfer pipeline are calculated at the differential pressure calculator, and the flow control valve is controlled accordingly based on the calculation results to ensure that the flow rate of the total outlet pipeline is maintained within a specific range.

[0021] As can be seen from the above technical solution, compared with the prior art, the present invention discloses a nitrogen utilization system for nitrogen venting and compression in solar cell processing, the beneficial effects of which are:

[0022] (1) In this invention, by connecting the transfer pipeline to the outlet pipeline of the air compressor, nitrogen can be utilized and the workload of the air compressor system can be reduced.

[0023] (2) The pressure in the transfer pipeline and the outlet pipeline of the air compressor can be calculated by the differential pressure calculator. The flow control valve can be adjusted according to the calculation results to adjust the gas pressure in the transfer pipeline, thereby ensuring the reuse of nitrogen in the transfer pipeline and maintaining the total outlet pipeline flow at a specific value so that it can be used normally. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0025] Figure 1 A schematic diagram of the nitrogen utilization system provided by the present invention;

[0026] Figure 2 This is a schematic diagram of the control system structure provided by the present invention;

[0027] Figure 3 This is a schematic diagram of the connection between the shut-off valve and the integrated component provided by the present invention.

[0028] In the figure,

[0029] 1-Air separation nitrogen generator; 2-Main gas supply line; 3-Vent line; 4-Transfer line; 5-First pressure sensor; 6-Flow regulating valve; 7-Air compressor; 8-Adsorption dryer; 9-Drying tank; 10-Outlet line; 11-Second pressure sensor;

[0030] 12-Control System;

[0031] 121 - Computational Unit;

[0032] 1211 - Differential Pressure Calculator; 1212 - PID Regulator; 1213 - A / D Converter; 1214 - D / A Converter;

[0033] 122 - Flow control valve controller; 123 - First transmitter; 124 - Second transmitter;

[0034] 13-First shut-off valve; 14-Second shut-off valve; 15-Flow meter; 16-Pressure gauge; 17-Check valve; 18-Main outlet pipeline; 19-Third pressure sensor. Detailed Implementation

[0035] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0036] This invention discloses a nitrogen utilization system for nitrogen venting and compressed air recirculation in solar cell processing, comprising:

[0037] The air separation nitrogen generator 1 is connected to a main gas supply pipeline 2, a vent pipeline 3, and a transfer pipeline 4 at its outlet end; a first pressure sensor 5 and a flow regulating valve 6 are installed on the transfer pipeline 4.

[0038] An air compressor 7 is connected to an adsorption dryer 8 at its outlet end. A dry tank 9 is connected to the outlet end of the adsorption dryer 8. The outlet pipe 10 of the dry tank 9 is connected to a transfer pipe 4. A second pressure sensor 11 is connected to the outlet pipe 10 of the dry tank 9.

[0039] The control system 12 is electrically connected to the first pressure sensor 5, the second pressure sensor 11, and the flow regulating valve 6, respectively. It receives the pressure values ​​transmitted by the first and second pressure sensors 5 and 11 and controls the operation of the flow regulating valve 6. Nitrogen in the conversion pipeline 4 can only enter the main outlet pipeline 18 and be utilized if the gas pressure in the conversion pipeline 4 is 0.03 MPa higher than the pressure in the outlet pipeline 10 of the dry tank 9.

[0040] To further optimize the above technical solution, a vent silencer is installed on the vent pipe 3 to reduce noise.

[0041] To further optimize the above technical solution, a first shut-off valve 13 is installed at the end of the transfer pipeline 4 near the air separation nitrogen generator 1.

[0042] To further optimize the above technical solution, a second shut-off valve 14 is installed at one end of the transfer pipeline 4 near the outlet pipeline 10 of the dry tank 9.

[0043] To further optimize the above technical solution, a flow meter 15, a pressure gauge 16, and a check valve 17 are sequentially installed on the transfer pipeline 4 between the first shut-off valve 13 and the second shut-off valve 14.

[0044] To further optimize the above technical solution, the flow meter 15, flow regulating valve 6, pressure gauge 16, first pressure sensor 5, and check valve 17 are integrated into one unit. For example... Figure 3 As shown, the first shut-off valve 13 and the second shut-off valve are directly connected to the integrated components, making pipeline connection more convenient.

[0045] To further optimize the above technical solution, the flow meter 15 is selected as an orifice plate flow meter.

[0046] To further optimize the above technical solution, the outlet pipe 10 of the dry tank 9 and the transfer pipe 4 are connected to the main gas outlet pipe 18, and a third pressure sensor 19 is connected to the main gas outlet pipe 18.

[0047] To further optimize the above technical solution, the control system 12 includes: a calculation unit 121 and a flow regulating valve controller 122; the input terminal of the calculation unit 121 is electrically connected to the first pressure sensor 5 and the second pressure sensor 11 respectively; the output terminal of the calculation unit 121 is electrically connected to the flow regulating valve controller 122; the flow regulating valve controller 122 is electrically connected to the flow regulating valve 6 and controls the opening and closing of the flow regulating valve 6.

[0048] To further optimize the above technical solution, the input terminal of the computing unit 121 is connected to a first transmitter 123 and a second transmitter 124 respectively. The input terminal of the first transmitter 123 is electrically connected to the first pressure sensor 5; the input terminal of the second transmitter 124 is electrically connected to the second pressure sensor 11.

[0049] To further optimize the above technical solution, the calculation unit 121 calculates the pressure difference between the gas pressure in the conversion pipeline 4 and the pressure difference in the outlet pipeline 10 of the dry tank 9. When the difference is less than 0.03MPa, the opening and closing of the flow regulating valve 6 is adjusted appropriately to increase the gas pressure, thereby reducing the load on the air compressor system while ensuring that nitrogen is reused.

[0050] To further optimize the above technical solution, the calculation unit 121 includes: a differential pressure calculator 1211 and a PID controller 1212; the input terminal of the differential pressure calculator 1211 is electrically connected to the first transmitter 123 and the second transmitter 124 respectively through an A / D converter 1213; the output terminal of the differential pressure calculator 1211 is electrically connected to the PID controller 1212, and the output terminal of the PID controller 1212 is electrically connected to the flow regulating valve controller 122 through a D / A converter 1214.

[0051] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0052] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A nitrogen utilization system for nitrogen venting and compressed air connection in solar cell processing, characterized in that, include: An air separation nitrogen generator (1) is provided with a main gas supply pipeline (2), a vent pipeline (3) and a transfer pipeline (4) at its outlet end; a first pressure sensor (5) and a flow regulating valve (6) are provided on the transfer pipeline (4). An air compressor (7) is connected to an adsorption dryer (8) at its outlet end. The adsorption dryer (8) is connected to a dry tank (9) at its outlet end. The outlet pipe (10) of the dry tank (9) is connected to the transfer pipe (4). A second pressure sensor (11) is connected to the outlet pipe (10) of the dry tank (9). The control system (12) is electrically connected to the first pressure sensor (5), the second pressure sensor (11) and the flow regulating valve (6) respectively, and is used to receive the pressure values ​​transmitted by the first pressure sensor (5) and the second pressure sensor (11) and control the operation of the flow regulating valve (6). The control system (12) includes: a computing unit (121) and a flow regulating valve controller (122); the input terminal of the computing unit (121) is electrically connected to the first pressure sensor (5) and the second pressure sensor (11) respectively; the output terminal of the computing unit (121) is electrically connected to the flow regulating valve controller (122); the flow regulating valve controller (122) is electrically connected to the flow regulating valve (6) and controls the opening and closing of the flow regulating valve (6); The input terminals of the computing unit (121) are respectively connected to a first transmitter (123) and a second transmitter (124). The input terminal of the first transmitter (123) is electrically connected to the first pressure sensor (5); the input terminal of the second transmitter (124) is electrically connected to the second pressure sensor (11). The calculation unit (121) includes: a differential pressure calculator (1211) and a PID controller (1212); the input terminal of the differential pressure calculator (1211) is electrically connected to the first transmitter (123) and the second transmitter (124) respectively through an A / D converter (1213); the output terminal of the differential pressure calculator (1211) is electrically connected to the PID controller (1212), and the output terminal of the PID controller (1212) is electrically connected to the flow control valve controller (122) through a D / A converter (1214); The outlet pipe (10) of the dry tank (9) and the transfer pipe (4) are connected to the main gas outlet pipe (18), and a third pressure sensor (19) is connected to the main gas outlet pipe (18).

2. The nitrogen utilization system for nitrogen venting and compressed air connection in solar cell processing according to claim 1, characterized in that, The transfer pipeline (4) is equipped with a first shut-off valve (13) at one end near the air separation nitrogen generator (1).

3. The nitrogen utilization system for nitrogen venting and compressed air connection in solar cell processing according to claim 2, characterized in that, A second shut-off valve (14) is provided at one end of the transfer pipeline (4) near the outlet pipeline (10) of the dry tank (9).

4. The nitrogen utilization system for nitrogen venting and compressed air connection in solar cell processing according to claim 3, characterized in that, A flow meter (15), a pressure gauge (16), and a check valve (17) are sequentially installed on the transfer pipeline (4) between the first shut-off valve (13) and the second shut-off valve (14).

5. The nitrogen utilization system for nitrogen venting and compressed air connection in solar cell processing according to claim 4, characterized in that, The flow meter (15), flow regulating valve (6), pressure gauge (16), first pressure sensor (5) and check valve (17) are integrated into one unit.

6. The nitrogen utilization system for nitrogen venting and compressed air connection in solar cell processing according to claim 4 or 5, characterized in that, The flow meter (15) is an orifice plate flow meter.

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