Acid recovery system for reducing TOPCon battery BSG workshop waste acid treatment cost

Abstract

The utility model relates to an acid recovery system for reducing the waste acid treatment cost of a TOPCon battery BSG workshop, which is arranged between a BSG removal process machine table and a PSG removal process machine table and comprises a sewage pool collecting barrel, a chemical liquid supply room ton barrel and a concentration tester, an overflow auxiliary tank of the BSG removal process machine table is communicated with the sewage pool collecting barrel through a first pipeline, and the overflow auxiliary tank is communicated with the PSG removal process machine table through a second pipeline. The sewage pool collecting barrel is communicated with a liquid inlet of the chemical liquid supply room ton barrel through a second pipeline, a liquid outlet of the chemical liquid supply room ton barrel is connected with the PSG removal process machine table through a third pipeline, a filter screen and a magnetic pump are arranged on the second pipeline, and the concentration tester is used for measuring the acid concentration. According to the utility model, waste acid discharged in the BSG removal process is recycled to the PSG removal process for secondary utilization, so that the waste acid treatment cost is reduced, the secondary utilization of discharged waste acid is improved, and the acid consumption of a workshop is reduced.

Description

Technical Field

[0001] The utility model relates to an acid recovery system for reducing the waste acid treatment cost of a TOPCon battery BSG workshop. Background Art

[0002] TOPCon cells are a type of photovoltaic crystalline silicon cells. In recent years, they have been gradually adopted by industry companies due to their obvious advantages such as high conversion efficiency, low attenuation performance, and high mass production cost performance. The preparation process of TOPCon cells includes cleaning and texturing, front boron diffusion, laser and post-oxidation, BSG (borosilicate glass) removal and alkali polishing, oxide layer passivation contact preparation, PSG (phosphorus silicon glass) removal, front aluminum oxide / silicon nitride deposition, back silicon nitride deposition, printing, sintering and light injection. Among them, in the prior art, the acid concentration in the BSG removal process is high, the sewage treatment cost is high after the waste acid is discharged, and the acid consumption is high. Utility Model Content

[0003] The technical problem to be solved by the utility model is: in order to overcome the above technical problems, the utility model provides an acid recovery system for reducing the waste acid treatment cost of a TOPCon battery BSG workshop.

[0004] The utility model solves the technical problem by adopting the following technical solution: an acid recovery system for reducing the waste acid treatment cost of a TOPCon battery BSG workshop, which is arranged between a BSG removal process machine and a PSG removal process machine, wherein the BSG removal process machine has an acid tank, a water tank, a spray tank and an overflow auxiliary tank, wherein the acid tank comprises a BSG removal main tank body and a circulation auxiliary tank, wherein the circulation auxiliary tank receives the overflow of the BSG removal main tank body, wherein the acid recovery system comprises a sewage pool collection barrel, a chemical liquid supply room ton barrel and a concentration tester, wherein the circulation auxiliary tank is connected to the sewage pool collection barrel through a first pipeline, and the chemical liquid supply room ton barrel has a liquid inlet. The sewage pool collecting barrel is connected with the liquid inlet of the chemical liquid supply room ton barrel through the second pipeline, and the liquid outlet of the chemical liquid supply room ton barrel is connected with the PSG removal process machine through the third pipeline. The second pipeline is provided with a filter and a magnetic pump. The first pipeline is provided with a first liquid intake port at the pipeline opening where the first pipeline enters the sewage pool collecting barrel, and the sewage pool collecting barrel is provided with a second liquid intake port. The liquid inlet and liquid outlet of the chemical liquid supply room ton barrel are respectively provided with a third liquid intake port and a fourth liquid intake port. The concentration tester measures the concentration of substances taken from the first liquid intake port, the second liquid intake port, the third liquid intake port and / or the fourth liquid intake port.

[0005] The filter screen is arranged at the discharge port of the sewage pool collection bucket.

[0006] The chemical liquid supply room ton barrel is a hydrofluoric acid room ton barrel.

[0007] The beneficial effect of the utility model is that the utility model provides an acid recovery system for reducing the waste acid treatment cost of the TOPCon battery BSG workshop, by recovering the waste acid discharged from the BSG removal process to the PSG removal process for secondary utilization, thereby reducing the waste acid treatment cost, improving the secondary utilization of waste acid emissions, and reducing the acid consumption in the workshop. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0009] Figure 1 It is a structural schematic diagram of an acid recovery system for reducing the waste acid treatment cost of a TOPCon battery BSG workshop according to the utility model.

[0010] In the figure, 100 is a machine for removing BSG process, 101 is a sewage pool collection barrel, 102 is a filter, 103 is a magnetic pump, 104 is a ton barrel in the chemical liquid supply room, 1041 is a liquid inlet, 1042 is a liquid outlet, 105 is a machine for removing PSG process, 106 is a first pipeline, 107 is a second pipeline, and 108 is a third pipeline. DETAILED DESCRIPTION

[0011] Now the utility model is further described in detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, which only illustrate the basic structure of the utility model in a schematic manner, and therefore only show the components related to the utility model.

[0012] like Figure 1 As shown, the utility model is an acid recovery system for reducing the waste acid treatment cost of the TOPCon battery BSG workshop, which is arranged between the BSG removal process machine 100 and the PSG removal process machine 105. The BSG removal process machine 100 has an acid tank, a water tank, a spray tank and an overflow sub-tank. The acid tank includes a BSG removal main tank body and a circulation sub-tank. The circulation sub-tank receives the overflow of the BSG removal main tank body. The acid recovery system includes a sewage pool collection barrel 101, a chemical liquid supply room ton barrel 104 and a concentration tester. The circulation sub-tank is connected to the sewage pool collection barrel 101 through a first pipeline 106. The acid recovery only receives sulfuric acid from the overflow sub-tank of the BSG removal process, and does not accept normal foam tank liquid exchange acid.

[0013] The chemical liquid supply room ton barrel 104 has a liquid inlet 1041 and a liquid outlet 1042. The sewage pool collection barrel 101 is connected to the liquid inlet 1041 of the chemical liquid supply room ton barrel 104 through the second pipeline 107. The liquid outlet 1042 of the chemical liquid supply room ton barrel 104 is connected to the PSG removal process machine 105 through the third pipeline 108. The second pipeline 107 is provided with a filter 102 and a magnetic pump 103. The first pipeline 106 is provided with a first liquid intake port at the pipe opening where it enters the sewage pool collection barrel 101. The sewage pool collection barrel 101 is provided with a second liquid intake port. The liquid inlet 1041 and the liquid outlet 1042 of the chemical liquid supply room ton barrel 104 are respectively provided with a third liquid intake port and a fourth liquid intake port. The concentration tester measures the concentration of substances taken from the first liquid intake port, the second liquid intake port, the third liquid intake port and / or the fourth liquid intake port. The first liquid collection port, the second liquid collection port, the third liquid collection port and the fourth liquid collection port all use on-site tube-type liquid collection, and the test results are obtained by measuring with a concentration tester. The concentration tester mainly detects the acid concentration, and can also detect the concentration of other metal ions, thereby determining whether the acid is contaminated.

[0014] The first pipe 106 enters the first liquid extraction port at the pipe opening of the sewage pool collection barrel 101. Liquid extraction here can detect the concentration of waste acid discharged in real time by the BSG removal process machine 100; the second liquid extraction port on the sewage pool collection barrel 101 can detect the concentration of waste acid collected in the sewage pool collection barrel 101. The third liquid extraction port of the liquid inlet 1041 of the chemical liquid supply room ton barrel 104 can detect the concentration of waste acid after the waste acid in the sewage pool collection barrel 101 is filtered through the filter net. The concentration of impurity metal ions can also be detected here to detect whether there is impurity metal residue. The fourth liquid extraction port of the liquid outlet 1042 of the chemical liquid supply room ton barrel 104 can detect the concentration of waste acid discharged from the chemical liquid supply room ton barrel 104, as well as the concentration of impurity metal ions, so as to determine whether the chemical liquid supply room ton barrel 104 is contaminated. Since the cleaning of the chemical liquid supply room ton barrel 104 is relatively troublesome, it is necessary to detect the concentration of impure metal ions at the fourth liquid intake port of the liquid outlet 1042 of the chemical liquid supply room ton barrel 104.

[0015] The filter screen 102 is arranged at the discharge port of the sewage pool collection barrel 101 .

[0016] Chemical liquid supply room ton barrel 104 is a hydrofluoric acid room ton barrel.

[0017] The utility model is an acid recovery system for reducing the cost of waste acid treatment in the BSG workshop of TOPCon batteries. It is only suitable for the secondary utilization of waste acid in the BSG removal process. During the specific operation, the collection barrel 101 of the sewage pool is uniformly cleaned and discharged; the waste acid in the BSG removal process is discharged. Here, the waste acid recovery of the acid recovery system of the utility model only accepts the overflow acid of the acid tank in the BSG removal process. The waste acid is filtered through the filter 102 and discharged to the chemical liquid supply room ton barrel 104 for sampling and testing through the magnetic pump 103. After the sampling test samples are collected, the ABB concentration tester is used to test the concentration of the filtered waste acid. The waste acid concentration is about 17.44% and meets the standard. After the quality inspection is notified, it can be introduced into the workshop through the chemical liquid supply room ton barrel 104 to the PSG removal process machine 105. In order to ensure the accuracy of the test, the above sampling test samples need to be sampled and tested after the waste acid flushing pipeline.

[0018] Based on the above ideal embodiments of the utility model, the relevant staff can make various changes and modifications without deviating from the technical concept of the utility model through the above description. The technical scope of the utility model is not limited to the content of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. An acid recovery system for reducing the cost of waste acid treatment in a TOPCon battery BSG workshop, characterized in that: The invention is arranged between a BSG removal process machine (100) and a PSG removal process machine (105). The BSG removal process machine (100) has an acid tank, a water tank, a spray tank and an overflow auxiliary tank. The acid tank includes a BSG removal main tank body and a circulation auxiliary tank. The circulation auxiliary tank receives the overflow of the BSG removal main tank body. The acid recovery system includes a sewage pool collection barrel (101), a chemical liquid supply room ton barrel (104) and a concentration tester. The circulation auxiliary tank is connected to the sewage pool collection barrel (101) through a first pipeline (106). The chemical liquid supply room ton barrel (104) has a liquid inlet (1041) and a liquid outlet (1042). The sewage pool collection barrel (101) is connected to the chemical liquid supply room ton barrel (104) through a second pipeline (107). The liquid inlet (1041) of the chemical liquid supply room ton barrel (104) is connected to the liquid outlet (1042) of the chemical liquid supply room ton barrel (104) is connected to the PSG removal process machine (105) through a third pipeline (108); the second pipeline (107) is provided with a filter (102) and a magnetic pump (103); the first pipeline (106) is provided with a first liquid intake port at the pipeline opening where it enters the sewage pool collection barrel (101); the sewage pool collection barrel (101) is provided with a second liquid intake port; the liquid inlet (1041) and the liquid outlet (1042) of the chemical liquid supply room ton barrel (104) are respectively provided with a third liquid intake port and a fourth liquid intake port; the concentration tester measures the concentration of the substance taken from the first liquid intake port, the second liquid intake port, the third liquid intake port and / or the fourth liquid intake port.

2. The acid recovery system for reducing the waste acid treatment cost of TOPCon battery BSG workshop according to claim 1, characterized in that: The filter screen (102) is arranged at the discharge port of the sewage pool collection bucket (101).

3. The acid recovery system for reducing the waste acid treatment cost of TOPCon battery BSG workshop according to claim 1, characterized in that: The chemical liquid supply room ton barrel (104) is a hydrofluoric acid room ton barrel.

Images