An automatic feeding method for the production of solar-grade N-type monocrystalline silicon

Abstract

The present invention discloses an automatic reporting method for solar-grade N-type monocrystalline silicon production, including a system that first collects the current single crystal furnace operating status and related background data, determines whether the current furnace operation step meets the feeding conditions; then sets calculation logic within the system to automatically calculate the required feeding amount, and logically determines whether the feeding amount meets the requirements; if it meets the requirements, the relevant information is automatically pushed to the preparation room for preparation; if it does not meet the requirements, the feeding amount is identified as abnormal, and manual confirmation is pushed on site for manual review; after review and confirmation, the relevant information is sent to the preparation room for preparation, and the relevant information is automatically entered into the MES system. The advantages of the present invention are that it reduces manual reporting and review, improves work efficiency, reduces the man-machine ratio, and realizes automated execution judgment. It is applicable to N-type or P-type monocrystalline silicon and makes preparations for the next step of smart factories.

Description

Technical Field

[0001] The present invention relates to the field of photovoltaic manufacturing technology, and in particular to an automatic material reporting method for producing solar-grade N-type monocrystalline silicon. Background Art

[0002] In existing monocrystalline silicon production, material reporting is generally done by personnel calculating the remaining material in the single crystal furnace, then manually calculating the amount of material to be added in the next step, and reporting the amount of material to be added to the material preparation. This traditional method has the following three problems:

[0003] (1) Due to human error, the amount of material added was calculated incorrectly, resulting in over-addition and causing a silicon overflow safety accident in the single crystal furnace;

[0004] (2) Staff’s inadequate attention leads to errors in the furnace;

[0005] (3) The material preparation system cannot identify the current feeding status of the furnace area, which may easily lead to overfeeding. Summary of the Invention

[0006] The purpose of this invention is to solve the problems of the existing single reporting method, manual calculation prone to errors, and the added amount not meeting the requirements. It provides an automatic reporting method for solar-grade N-type monocrystalline silicon production, which reduces manual reporting and review, improves work efficiency, reduces the man-machine ratio, realizes automated execution and judgment, and prepares for the next step of smart factories.

[0007] In order to achieve the above object, the present invention adopts the following technical solutions:

[0008] An automatic material reporting method for solar-grade N-type monocrystalline silicon production, comprising the following specific steps:

[0009] (1) The system collects the current single crystal furnace operation status and related background data to determine whether the current furnace operation step meets the charging conditions;

[0010] (2) The system sets calculation logic inside to automatically calculate the required feeding amount and logically judge whether the feeding amount meets the requirements;

[0011] (3) If the requirements are met, the relevant information will be automatically pushed to the material preparation room for preparation. If the requirements are not met, the abnormal feeding amount will be identified and pushed to the site for manual confirmation and manual review of the abnormality;

[0012] (4) After review and confirmation, the relevant information will be sent to the material preparation room for preparation, and the relevant information will be automatically entered into the MES system.

[0013] Furthermore, in step (1), if the furnace is in the melting stage, the material is added 4 hours after the melting step is started; if it is in the line breaking / segment taking and finishing stage, the material is added after the line breaking / segment taking and finishing step is started.

[0014] Furthermore, in step (1), if the furnace is in the melting step, it is necessary to collect the amount of remaining material in the melting crucible and the type of crucible to calculate the feeding amount.

[0015] Furthermore, in step (1), if the furnace is in the process of removing the broken line / taking the segment to the end, it is necessary to collect the R1 segment seeding crucible position, the end of taking the segment / breaking line - the corresponding equal-diameter "final crucible position", the end of taking the segment / breaking line - the corresponding amount of remaining material in the crucible, the running time, the amount of material already fed, the furnace number, the crystal number and the crucible type, so as to calculate the feeding amount.

[0016] Furthermore, in step (2), if the furnace is in the melting step, the calculation logic of the feeding amount is: the pushing feeding amount = the upper limit of the feeding amount in the R1 section - the remaining material in the crucible.

[0017] Furthermore, in step (2), if the furnace is in the melting step, the logic for judging the feeding amount is: the pushing feeding amount + the remaining material in the crucible < the upper limit of the feeding amount in the R1 section.

[0018] Furthermore, in step (2), if the furnace is in the process of breaking the line / taking the section to the end, the calculation logic of the feeding amount is as follows: input the R1 section seeding crucible position, the end of the section / breaking the line-corresponding "final crucible position" and the 36-inch increase in whether to break the line in the crucible position and feeding amount comparison calculation table, and the corresponding feeding amount can be output.

[0019] Furthermore, in step (2), if the furnace is in the final step of line breaking / segment removal, the logic for judging the feeding amount is: the feeding amount pushed + the amount of remaining material in the crucible < the upper limit of the feeding amount, and the corresponding feeding amount < the maximum feeding amount limit.

[0020] Furthermore, in step (4), the feeding amount is output through a report or a mode pushed to MES, the preparation room provides relevant data, and the number of feeding barrels and related data in each section are displayed in real time.

[0021] Furthermore, in the crucible position and feeding amount comparison calculation table in step (2), the total feeding amount H is first obtained by the crucible position and liquid level drop algorithm, H is first rounded to obtain H', if 400<H'<410, then the value 410 is taken, otherwise the value H' is taken, then H' is compared with 100, if H'≥100, then the value H' is taken, otherwise no value is taken, finally H' is compared with the maximum feeding amount limit value M corresponding to the crucible type, if H'<M, then the corresponding feeding amount output is H', otherwise the corresponding feeding amount output is M.

[0022] The crucible position and liquid level drop algorithm used in the present invention is an existing algorithm, which can calculate the volume corresponding to the actual drop distance of the liquid level inside the crucible when the crucible position changes, thereby calculating the total mass of the material to be added.

[0023] Compared with the prior art, the advantages of the technical solution of the present invention are:

[0024] (1) The automatic reporting system of the present invention saves manpower, improves work efficiency, and reduces the on-site man-machine ratio from 60:6 to 60:5;

[0025] (2) The automatic reporting accuracy of the present invention reaches 100%, reducing the inaccurate and abnormal human judgment;

[0026] (3) The automatic material reporting system of the present invention is applicable to N-type or P-type single crystal silicon, and realizes automatic recording of the material feeding system, which reduces the burden on personnel and reduces the manual material reporting and review procedures. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 Schematic diagram of the system flow of the automatic reporting method of the present invention;

[0028] Figure 2 This is the input interface diagram of the crucible position and material feeding amount comparison calculation table in the present invention. DETAILED DESCRIPTION

[0029] Example 1

[0030] To make the present invention more clear, the following further describes an automatic material reporting method for solar-grade N-type monocrystalline silicon production according to the present invention in conjunction with the accompanying drawings. The specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0031] See also Figure 1 An automatic material reporting method for solar-grade N-type monocrystalline silicon production, comprising the following specific steps, characterized in that:

[0032] (1) The system identifies the feeding status and determines whether the current furnace operation step meets the feeding conditions:

[0033] a. If the furnace is in the melting stage, start the melting step 4 hours before adding material;

[0034] b. If it is in the stage of breaking line extraction / segment removal, material addition shall be carried out after starting the breaking line extraction / segment removal step.

[0035] (2) The system sets calculation logic inside to automatically calculate the required feeding amount and logically judge whether the feeding amount meets the requirements:

[0036] a. If the furnace platform is in the melting material process step, the calculated feeding amount demand data includes collecting the remaining material amount in the melting crucible and the crucible type. The feeding amount calculation logic is: the pushed feeding amount = the upper limit of the feeding amount in the R1 section - the remaining material amount in the crucible. The feeding amount judgment logic is: the pushed feeding amount + the remaining material amount in the crucible < the upper limit of the feeding amount in the R1 section;

[0037] b. If the furnace platform is in the wire breakage extraction / take section end process step, the calculated feeding amount demand data includes the R1 section seeding crucible position, take section end / wire breakage extraction - corresponding equal diameter "final crucible position", take section end / wire breakage extraction - corresponding remaining material amount in the crucible, running duration, already fed amount, furnace number, crystal number, and crucible type;

[0038] The feeding amount calculation logic for the RCZ section is: Refer to Figure 2 , input the R1 section seeding crucible position, take section end / wire breakage extraction - corresponding equal diameter "final crucible position", and whether the 36-inch increase is a wire breakage selection in the crucible position and feeding amount comparison calculation table. The R1 section seeding crucible position is the initial seeding crucible position in the table, and the take section end / wire breakage extraction - corresponding equal diameter "final crucible position" is the proposed crucible position before feeding in the table. After inputting, the corresponding feeding amount can be output through the specific algorithm of the table;

[0039] The above specific algorithm includes the crucible position and liquid level drop algorithm. Through the crucible position and liquid level drop algorithm, the total feeding amount H can be obtained, and then the corresponding feeding amount can be obtained by using the following logical operations:

[0040] First, round H to get H'. If 400 < H' < 410, then take the value 410; otherwise, take the value H';

[0041] Second, compare H' with 100. If H' ≥ 100, then take the value H'; otherwise, do not take the value;

[0042] Finally, compare H' with the maximum feeding amount limit value M corresponding to the crucible type. If H' < M, the corresponding feeding amount output is H'; otherwise, the corresponding feeding amount output is M.

[0043] The above logic corresponds to Figure 2 the numerical operation of "corresponding feeding amount" in the "output area" of the table shown, which is "=IF(crucible position and liquid level drop algorithm!H<M,IF(crucible position and liquid level drop algorithm! H<100,\" / \",IF(AND(crucible position and liquid level drop algorithm!H>400,crucible position and liquid level drop algorithm!H<410),410,ROUND(crucible position and liquid level drop algorithm!H,0))),M)", where crucible position and liquid level drop algorithm!H is the total feeding amount calculated in the crucible position and liquid level drop algorithm, and M is the maximum feeding amount limit value for this crucible type. This operation involves the IF statement, AND statement, and ROUND statement:

[0044] IF is a conditional judgment processing function, and AND is a logical function. IF first calculates the AND logical operation. The IF function syntax is IF (condition judgment, return the value that meets the condition, return the value that does not meet the condition). For example, IF(1>2,"Y","N") returns N because the condition is not met. AND is a logical function with the syntax AND(condition 1, condition 2, condition 3). It returns TRUE only if all conditions in AND are met. If AND appears in IF, the AND logical operation is calculated first, followed by the IF function logic.

[0045] ROUND means to return a number that is rounded to a specified number of digits. In this embodiment, ROUND (cruciform position and liquid level drop algorithm!H,0) rounds H to an integer without decimals.

[0046] See also Figure 2 The numbers in the table show that the seeding crucible position of the R1 segment is -100 at this time, and the segment end / break line is proposed - the corresponding equal diameter "final crucible position" is 230. According to the crucible position and liquid level drop algorithm, the total amount of material added H is 435.06, and it can be rounded to get H' as 435. Since 435 is not in the range of 400~410, 435 is taken in the algorithm, and then 435 is compared with 100. Since 435>100, the value that does not meet the conditions in the IF function is 435, and finally 435 is compared with the maximum feeding amount limit value M. It can be seen from the table that when the crucible type is a 33-inch 620 crucible, M is 414. Since 435>414, the value that does not meet the conditions in the outermost IF function is returned, that is, 414, and the corresponding feeding amount in the output area of the table is 414.

[0047] The logic for judging the feeding amount in the RCZ section is: the pushed feeding amount + the remaining material in the crucible < the upper limit of the feeding amount, and the corresponding feeding amount < the maximum feeding amount limit.

[0048] (3) If the feeding amount meets the logical judgment requirements of each process step, the relevant information will be automatically pushed to the material preparation room for preparation, and the feeding amount will be output through a report or pushed to the MES mode. The material preparation room will provide relevant data. If it does not meet the requirements, the feeding amount will be identified as abnormal, pushed to the site for manual confirmation, and abnormal manual review will be carried out;

[0049] (4) After review and confirmation, the relevant information will be sent to the material preparation room for preparation, and the relevant information will be automatically entered into the MES system.

[0050] The present invention designs and compiles automated operation procedures, converts manual operations into automated work steps, and reduces the burden of personnel review by optimizing process design. The on-site man-machine ratio is reduced from 60:6 to 60:5. According to the company's 810 furnace table design, 14 people can be reduced.

[0051] In addition to the above embodiments, the present invention may also have other implementations. Any technical solution formed by equivalent replacement or equivalent transformation falls within the scope of protection required by the present invention.

Claims

1. An automatic material reporting method for solar-grade N-type monocrystalline silicon production, comprising the following steps, characterized in that: (1) The system collects the current single crystal furnace operating status and related background data to determine whether the current furnace operation step meets the charging conditions: If the furnace is in the melting stage, start the melting step 4 hours before adding material; If it is in the stage of breaking wire bringing out / taking segment finishing, then add material after starting the breaking wire bringing out / taking segment finishing step; (2) The system sets calculation logic inside to automatically calculate the required feeding amount and logically judge whether the feeding amount meets the requirements: If the furnace is in the melting step, it is necessary to collect the amount of remaining material in the melting crucible and the crucible type to calculate the feeding amount. The feeding amount calculation logic is: push feeding amount = R1 section feeding amount upper limit - remaining material in the crucible. The feeding amount judgment logic is: push feeding amount + remaining material in the crucible < R1 section feeding amount upper limit; If the furnace is in the process of raising the crystals after breaking / taking the section, it is necessary to collect the R1 section seeding crucible position, the section ending / breaking line raising - the corresponding equal diameter "final crucible position", the remaining material in the crucible, the running time, the charged amount, the furnace number, the crystal number and the crucible type to calculate the charging amount. The charging amount calculation logic is: enter the R1 section seeding crucible position, the section ending / breaking line raising - the corresponding equal diameter "final crucible position" and whether to add the line break selection at 36 inches in the crucible position and charging amount comparison calculation table, and the corresponding charging amount can be output. The charging amount judgment logic is: push charging amount + remaining material in the crucible < charging amount upper limit, corresponding charging amount < maximum charging amount limit; Among them, in the crucible position and feeding amount comparison calculation table, the total feeding amount H is first obtained by the crucible position and liquid level drop algorithm, and H is first rounded to obtain H'. If 400<H'<410, the value 410 is taken, otherwise the value H' is taken. Then H' is compared with 100. If H'≥100, the value H' is taken, otherwise no value is taken. Finally, H' is compared with the maximum feeding amount limit value M corresponding to the crucible type. If H'<M, the corresponding feeding amount output is H', otherwise the corresponding feeding amount output is M. (3) If the requirements are met, the relevant information will be automatically pushed to the material preparation room for preparation. If the requirements are not met, the abnormal feeding amount will be identified and pushed to the site for manual confirmation and manual review of the abnormality; (4) After review and confirmation, the relevant information will be sent to the material preparation room for preparation, and the relevant information will be automatically entered into the MES system.

2. The automatic material reporting method for solar-grade N-type single crystal silicon production according to claim 1, characterized in that: In the step (4), the feeding amount is output through a report or a mode pushed to the MES, the preparation room provides relevant data, and the number of feeding barrels and related data in each section are displayed in real time.

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