Process control method for automatic pickling and acid discharging of stainless steel

Abstract

The application discloses a process control method for automatic acid adding and discharging in stainless steel pickling, which comprises the following steps: collecting data to form a data package; calculating the steel passing amount of a pickling production line, formulating an acid adding coefficient and an acid discharging coefficient; setting an acid adding and discharging period, and operating the pickling production line; during the operation of the pickling production line, repeatedly calculating the acid adding amount and the acid discharging amount in the acid adding and discharging period, and then calculating the acid adding amount and the acid discharging amount in each acid adding and discharging period, and then adding and discharging the acid in each acid adding and discharging period. The process control method for automatic acid adding and discharging in stainless steel pickling has high control accuracy, effectively reduces the operation requirements of the operators, finely controls the acid adding and discharging, reduces the acid consumption of the production line, improves the pickling quality stability of the finished product surface, and can be simply and quickly controlled by using a field level (L1) computer system, so that the limitation of the equipment is small, and the convenience of use is greatly widened.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of continuous pickling of stainless steel, and particularly relates to a process control method for automatic pickling of stainless steel. BACKGROUND

[0002] The main production specifications of the HRAPL (HRAPL stands for black roll annealing pickling unit) are (1.3-6.0) mm* (720-1300) mm 2E and NO.1 products, such as 200 series austenitic stainless steel, 300 series austenitic stainless steel, 400 series martensitic stainless steel, and ferritic stainless steel, and new products are continuously developed to meet market demand. In the traditional pickling process, the amount of pickling acid and the amount of pickling acid are mainly manually set by manual operation. A certain amount of pickling acid and pickling acid are manually set, and the pickling acid is added and discharged at regular intervals. When the production specifications change greatly, the operation requires high skill. If the set value is not manually modified in time, the consumption and discharge amount cannot be adjusted in time, which not only causes cost loss due to acid consumption, but also causes the amount of pickling acid and pickling acid to be inconsistent with the actual production requirements, resulting in high acid consumption for pickling of stainless steel, unstable pickling quality of the finished product surface, and further quality loss.

[0003] Therefore, a control model is built on a secondary (L2) computer system. During production, a first-level (L1) computer system transmits information to the secondary (L2) computer system through an interface. The secondary (L2) computer system matches the corresponding set coefficient according to the current production steel grade, and after running and calculating through the control model in the secondary (L2) computer system, the calculated value is transmitted to the first-level (L1) computer system through the corresponding interface for control. Although this method can automatically adjust the amount of pickling acid and pickling acid under different steel grades and different production speeds, a secondary (L2) computer system is required, a complex model grouping table needs to be designed in the database of the secondary (L2) computer system, a special control model parameter maintenance related channel needs to be established, the secondary (L2) computer system needs to track production information, the processing module and the pickling module need to be associated, and the corresponding interface needs to be realized with the first-level (L1) computer system. The cost of building a secondary (L2) computer system and adding an interface module is high, and the control model and data interface and maintenance channel are complex. When there is no secondary (L2) computer system in the production site, this method cannot be used for control. That is, the application of this method has great limitations. SUMMARY

[0004] The present application relates to the technical field of continuous pickling of stainless steel, and particularly relates to a process control method for automatic pickling of stainless steel.

[0005] The technical solution for achieving the present application is as follows: a process control method for automatic pickling of stainless steel, comprising the following steps:

[0006] S1. Collecting data to form a data package, which includes the acid adding amount corresponding to each amount of passed steel and the acid discharging amount corresponding to each amount of passed steel;

[0007] S2. Formulating the acid adding coefficient and the acid discharging coefficient; the specific formulation steps include:

[0008] S2.1. Setting the acid adding and discharging period as T, the acid adding and discharging period is the acid adding interval time or the acid discharging interval time, which are collectively referred to as the interval time; detecting the running speed of the strip steel on the pickling production line as V, the width of the strip steel as d, and calculating the amount of passed steel in the acid adding and discharging period T according to the following formula: S=V*d*T*2, wherein S is the amount of passed steel in the acid adding and discharging period T;

[0009] S2.2. Retrieving the data package collected in step S1, and formulating the acid adding coefficient and the acid discharging coefficient according to the following formula: k1=N1 / S, k2=N2 / S, wherein k1 is the acid adding coefficient, N1 is the acid adding amount corresponding to the amount of passed steel S in the data package, k2 is the acid discharging coefficient, and N2 is the acid discharging amount corresponding to the amount of passed steel S in the data package;

[0010] S3. Setting the acid adding and discharging period as T x , and operating the pickling production line; during the operation of the pickling production line, repeatedly calculating the acid adding amount and the acid discharging amount in the acid adding and discharging period T x , calculating the acid adding amount and the acid discharging amount in each acid adding and discharging period T x , and after calculating the acid adding amount and the acid discharging amount in each acid adding and discharging period T x , performing corresponding acid adding and acid discharging in each acid adding and discharging period T x , wherein the calculation steps of the acid adding amount and the acid discharging amount in each acid adding and discharging period T x include:

[0011] S3.1. Detecting the running speed of the strip steel on the pickling production line as V x , the width of the strip steel as d x , and calculating the amount of passed steel in the acid adding and discharging period T x according to the following formula: S x =V x *d x *T x *2, wherein S x is the amount of passed steel in the acid adding and discharging period T x ;

[0012] S3.2. Calculating the acid adding amount and the acid discharging amount in the acid adding and discharging period T x according to the following formula: N s = k1*S x , N p= k2*S x wherein N s is the amount of acid added during the acid addition period T x , N p is the amount of acid discharged during the acid discharge period T x .

[0013] Further, the strip steel is welded by multiple units, and a weld joint is formed at the welding position between two adjacent units. A detection hole is formed at each weld joint, and a weld joint detector is installed at the entrance of the pickling production line to sense the detection hole. During the running of the strip steel on the pickling production line, the weld joint detector senses the detection hole at the weld joint on the strip steel in real time, and the running speed of the strip steel is detected in real time by sensing the detection hole at the weld joint on the strip steel. The detected running speed of the strip steel is used to verify the running speed of the strip steel on the pickling production line, so as to avoid calculation errors of the amount of added acid and the amount of discharged acid due to the fact that the running speed of the strip steel on the pickling production line does not conform to the actual situation.

[0014] Further, after the amount of added acid and the amount of discharged acid during each acid addition and discharge period T x is calculated in step S3, corresponding acid addition and discharge are performed during each acid addition and discharge period T x . The final actual amount of added acid during each acid addition and discharge period T x is N si , and the final actual amount of discharged acid during each acid addition and discharge period T x is N pj , wherein N si = N s ± N i , N pj = N p ± N j , N i is a manual acid addition correction value, and N j is a manual acid discharge correction value. Under normal circumstances, N i and N j may both be zero, N si = N s , and N pj = N p , that is, the calculated amount of added acid during each acid addition and discharge period T x may be directly used as the actual amount of added acid for acid addition, and the amount of discharged acid during each acid addition and discharge period T x may be directly used as the actual amount of discharged acid for acid discharge. In the case of abnormality in which the calculated amount of added acid and the amount of discharged acid cannot meet the quality requirements, an input box is added on the control interface, and a manual correction value can be input to correct the final actual amount of added acid and the actual amount of discharged acid, so that the production can meet the quality requirements. This setting has high flexibility, and can facilitate human intervention in a timely manner when acid addition and discharge are abnormal, thereby ensuring production quality.

[0015] Further, the process control method for automatic pickling and draining of stainless steel adopts PLC programming software to realize programming. By using simple PLC programming software, a calculation module is established, and excessive communication transmission is cancelled, so that the problem of needing to connect a control model and a production tracking information acquisition and processing module of a secondary (L2) computer system can be effectively avoided. The associated conditions and related information of the pickling module are directly calculated and transmitted on a primary (L1) computer system, so that the system of the process control method for automatic pickling and draining of stainless steel is simpler, the operation is more convenient, the application range is wider, and the system level is not limited.

[0016] The process control method for automatic pickling and draining of stainless steel takes the steel passing amount as a variable, and takes the pickling amount or the draining amount as a dependent variable. After the pickling coefficient representing the proportional relationship between the steel passing amount and the pickling amount, and the draining coefficient representing the proportional relationship between the steel passing amount and the draining amount are calculated, the steel passing amount in each pickling and draining period is calculated in real time during the operation of the pickling production line, and the steel passing amount, the pickling coefficient and the draining coefficient are further multiplied to obtain the pickling amount and the draining amount in each pickling and draining period, so that automatic pickling and draining of the pickling production line are realized.

[0017] In the process control method for automatic pickling and draining of stainless steel, the corresponding relationship between the steel passing amount and the pickling amount or the draining amount is the cornerstone of the accuracy of the calculation, and provides a reliable guarantee for the accuracy of the pickling amount and the draining amount, so that the pickling and draining of the pickling production line have high accuracy, and the pickling quality of the pickling production line is greatly guaranteed.

[0018] In the process control method for automatic pickling and draining of stainless steel, after the pickling coefficient and the draining coefficient are obtained, the steel passing amount in each pickling and draining period only needs to be repeatedly calculated according to the production time sequence during the entire production process of the pickling production line, and then the pickling amount and the draining amount in each pickling and draining period are obtained, so that automatic pickling and draining in each pickling and draining period of the pickling production line are realized. The entire calculation process is simple, and a simple programming program can realize it. During work, the program is repeatedly run and calculated for each pickling and draining period, which does not need to build a complex control module, and does not need to communicate, transmit, transform and issue control processes between a secondary (L2) computer system. The control can be simply and quickly completed by using a primary (L1) computer system on site, the complex parameter mutual transmission of multiple computer systems is avoided, the equipment investment and complex program calculation are reduced, the calculation control can be completed by using a primary (L1) computer system, the limitation of the equipment is small, and the convenience of use is greatly widened.

[0019] The application provides a process control method for automatic pickling and draining of stainless steel, which can be realized by a computer system of level 1 (L1). According to the running steel quantity of the strip steel within a set time, the pickling and draining coefficients of the steel grade are preset, and the pickling and draining quantities within a single set time are calculated according to a special calculation formula in the computer program, so that the automatic pickling and draining within a single set time can be realized, the operation requirements of the operator are effectively reduced, the pickling and draining are precisely controlled, the acid consumption of the production line is reduced, and the surface pickling quality of the finished product is improved. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 is a flow chart of the process control method for automatic pickling and draining of stainless steel according to the application;

[0021] Figure 2 is an installation position diagram of the weld detector in the process control method for automatic pickling and draining of stainless steel according to the application. DETAILED DESCRIPTION

[0022] The preferred embodiment of the process control method for automatic pickling and draining of stainless steel according to the application will be described in detail below with reference to the accompanying drawings:

[0023] A process control method for automatic pickling and draining of stainless steel, as shown in Figure 1 , comprises the following steps:

[0024] S1. Collecting data to form a data package, which includes the pickling quantity corresponding to each steel quantity and the draining quantity corresponding to each steel quantity;

[0025] S2. Formulating the pickling and draining coefficients; the specific formulation steps include:

[0026] S2.1. Setting the pickling and draining period as T, which is the interval time of pickling and draining, and the interval time of pickling and draining is the general term of the interval time of pickling and the interval time of draining; detecting the running speed of the strip steel on the pickling production line as V, and the width of the strip steel as d, and calculating the steel quantity of the pickling production line within the pickling and draining period T according to the following formula: S=V*d*T*2, wherein S is the steel quantity of the pickling production line within the pickling and draining period T;

[0027] S2.2. Retrieving the data package collected in step S1, and formulating the pickling and draining coefficients according to the following formula: k1=N1 / S, k2=N2 / S, wherein k1 is the pickling coefficient, N1 is the pickling quantity corresponding to the steel quantity S in the data package, k2 is the draining coefficient, and N2 is the draining quantity corresponding to the steel quantity S in the data package;

[0028] S3. Setting the pickling and draining period as T x, the acid pickling production line operation work; in the acid pickling production line operation work process, the calculation steps of the acid adding amount and the acid discharging amount in each acid adding and discharging period T x , the acid adding amount and the acid discharging amount in each acid adding and discharging period T x , the acid adding amount and the acid discharging amount in each acid adding and discharging period T x , the acid adding amount and the acid discharging amount in each acid adding and discharging period T x , the acid adding amount and the acid discharging amount in each acid adding and discharging period T x , the acid adding amount and the acid discharging amount in each acid adding and discharging period T

[0029] S3.1. Detecting the running speed of the strip steel on the acid pickling production line as V x , the strip steel width as d x , and calculating the steel passing amount in the acid adding and discharging period T x according to the following formula: S x =V x *d x *T x *2, wherein S x is the steel passing amount in the acid adding and discharging period T x .

[0030] S3.2. Calculating the acid adding amount and the acid discharging amount in the acid adding and discharging period T x according to the following formula: N s =k1*S x , N p =k2*S x , wherein N s is the acid adding amount in the acid adding and discharging period T x , and N p is the acid discharging amount in the acid adding and discharging period T x .

[0031] The process control method for automatic acid adding and discharging in stainless steel pickling can collect previous production data or experience data to form a data package to provide data support for the determination of the acid adding coefficient and the acid discharging coefficient, and the data package at least includes the corresponding acid adding amount of each steel passing amount and the corresponding acid discharging amount of each steel passing amount.

[0032] The process control method for automatic acid adding and discharging in stainless steel pickling needs to determine the acid adding coefficient and the acid discharging coefficient before being formally applied to the acid pickling production line. When determining the acid adding coefficient and the acid discharging coefficient, the steel passing amount is taken as the variable, and the acid adding amount or the acid discharging amount is taken as the dependent variable. The acid adding coefficient is the presentation of the corresponding relationship between the steel passing amount and the corresponding acid adding amount, and the acid discharging coefficient is the presentation of the corresponding relationship between the steel passing amount and the corresponding acid discharging amount.

[0033] The application is used for the process control method of automatic pickling and acid discharging of stainless steel, and is used for formulating the acid adding coefficient and the acid discharging coefficient, that is, the steel passing amount needs to be calculated, when the steel passing amount is calculated, one pickling and acid discharging period is taken as the deadline, and the steel passing amount in a single pickling and acid discharging period T is calculated. The calculation formula of the steel passing amount of the pickling production line in the pickling and acid discharging period T is S=V*d*T*2, S is the steel passing amount of the pickling production line in the pickling and acid discharging period T, V is the running speed of the strip on the pickling production line in the pickling and acid discharging period T, and d is the width of the strip on the pickling production line in the pickling and acid discharging period T, wherein, the running speed of the strip and the width of the strip on the existing pickling production line are detected in real time, and the running speed of the strip and the width of the strip on the pickling production line can be obtained at any time, that is, the detection scheme of the running speed of the strip and the width of the strip on the pickling production line is the existing conventional scheme, and the application will not be described in more detail.

[0034] The application is used for the process control method of automatic pickling and acid discharging of stainless steel, and after the steel passing amount in the pickling and acid discharging period is obtained, the acid adding amount and the acid discharging amount corresponding to the steel passing amount in the data packet collected in step S1 are called, and the acid adding coefficient and the acid discharging coefficient can be determined, specifically, the proportional relationship between the acid adding amount and the steel passing amount is the acid adding coefficient, and the proportional relationship between the acid discharging amount and the steel passing amount is the acid discharging coefficient.

[0035] The application is used for the process control method of automatic pickling and acid discharging of stainless steel, and after the acid adding coefficient and the acid discharging coefficient are obtained, automatic pickling and acid discharging can be realized in the running work of the pickling production line. In the running work of the pickling production line, the pickling and acid discharging period is set, and then the calculation steps of the acid adding amount and the acid discharging amount in the pickling and acid discharging period are repeated, the acid adding amount and the acid discharging amount in each pickling and acid discharging period are calculated one by one, and after the acid adding amount and the acid discharging amount in each pickling and acid discharging period are calculated, corresponding pickling and acid discharging are performed in each pickling and acid discharging period. Specifically, in the current pickling and acid discharging period, the acid adding amount and the acid discharging amount in the previous pickling and acid discharging period are calculated, and after the acid adding amount and the acid discharging amount in the previous pickling and acid discharging period are calculated, corresponding pickling and acid discharging are automatically controlled to be realized; after the pickling and acid discharging period ends, the next pickling and acid discharging period is entered, the calculation steps of the acid adding amount and the acid discharging amount in the pickling and acid discharging period are repeated for the next pickling and acid discharging period, the acid adding amount and the acid discharging amount of the next pickling and acid discharging period are calculated, and corresponding pickling and acid discharging are performed; with the running of the pickling production line, the calculation is repeated in this way, and the pickling and acid discharging in each pickling and acid discharging period in the running work process of the pickling production line is completed.

[0036] The present application is used for the process control method of automatic pickling and acid discharge of stainless steel, in the operation of pickling production line, when calculating the pickling amount and the acid discharge amount in each pickling and acid discharge period, only the steel passing amount in the pickling and acid discharge period needs to be calculated. After the steel passing amount in the pickling and acid discharge period is calculated, the product of the steel passing amount in the pickling and acid discharge period and the pickling coefficient is the pickling amount in the pickling and acid discharge period, and the product of the steel passing amount in the pickling and acid discharge period and the acid discharge coefficient is the acid discharge amount in the pickling and acid discharge period. After the pickling amount and the acid discharge amount in the pickling and acid discharge period are obtained, the automatic pickling and acid discharge can be realized according to the pickling amount and the acid discharge amount.

[0037] The present application is used for the process control method of automatic pickling and acid discharge of stainless steel, in the operation of pickling production line, when calculating the pickling amount and the acid discharge amount in each pickling and acid discharge period, only the steel passing amount in the pickling and acid discharge period needs to be calculated. After the steel passing amount in the pickling and acid discharge period is calculated, the product of the steel passing amount in the pickling and acid discharge period and the pickling coefficient is the pickling amount in the pickling and acid discharge period, and the product of the steel passing amount in the pickling and acid discharge period and the acid discharge coefficient is the acid discharge amount in the pickling and acid discharge period. After the pickling amount and the acid discharge amount in the pickling and acid discharge period are obtained, the automatic pickling and acid discharge can be realized according to the pickling amount and the acid discharge amount.

[0038] The present application is used for the process control method of automatic pickling and acid discharge of stainless steel, in the operation of pickling production line, when calculating the pickling amount and the acid discharge amount in each pickling and acid discharge period, only the steel passing amount in the pickling and acid discharge period needs to be calculated. After the steel passing amount in the pickling and acid discharge period is calculated, the product of the steel passing amount in the pickling and acid discharge period and the pickling coefficient is the pickling amount in the pickling and acid discharge period, and the product of the steel passing amount in the pickling and acid discharge period and the acid discharge coefficient is the acid discharge amount in the pickling and acid discharge period. After the pickling amount and the acid discharge amount in the pickling and acid discharge period are obtained, the automatic pickling and acid discharge can be realized according to the pickling amount and the acid discharge amount.

[0039] The present application is used for the process control method of automatic pickling and acid discharge of stainless steel, in the operation of pickling production line, when calculating the pickling amount and the acid discharge amount in each pickling and acid discharge period, only the steel passing amount in the pickling and acid discharge period needs to be calculated. After the steel passing amount in the pickling and acid discharge period is calculated, the product of the steel passing amount in the pickling and acid discharge period and the pickling coefficient is the pickling amount in the pickling and acid discharge period, and the product of the steel passing amount in the pickling and acid discharge period and the acid discharge coefficient is the acid discharge amount in the pickling and acid discharge period. After the pickling amount and the acid discharge amount in the pickling and acid discharge period are obtained, the automatic pickling and acid discharge can be realized according to the pickling amount and the acid discharge amount.

[0040] The application provides a process control method for automatic pickling and acid removal, which can be realized by a level 1 (L1) computer system, and is based on the running steel quantity of a strip steel within a set time, a preset steel type acid adding coefficient and an acid removal coefficient, and a special calculation formula in a computer program to calculate the acid adding quantity and the acid removal quantity required in a single set time, so as to realize automatic acid adding and acid removal in a single set time, effectively reduce the operation requirements of an operator, finely control the acid adding and acid removal, reduce the acid consumption of a production line, and improve the surface pickling quality stability of a finished product.

[0041] The application relates to a process control method for automatic pickling and acid removal of a stainless steel, preferably as shown in the figure. Figure 2 The strip steel 10 is welded by a plurality of units 1, and a weld 2 is formed at the welding position of the adjacent two units 1. A detection hole 21 is arranged at each weld 2, and a weld detection instrument 20 is arranged at the entrance of a pickling production line to detect the detection hole 21. During the running of the strip steel on the pickling production line, the weld detection instrument 20 detects the detection hole 21 at the weld 2 on the strip steel 10 in real time, and the running speed of the strip steel 10 is detected by detecting the detection hole 21 at the weld 2 on the strip steel 10 in real time. The detected running speed of the strip steel 10 is used to check the running speed of the strip steel on the pickling production line, so that the calculation error of the running speed of the strip steel on the pickling production line is avoided, and the calculation error of the acid adding quantity and the acid removal quantity is avoided.

[0042] The application relates to a process control method for automatic pickling and acid removal of a stainless steel, preferably as shown in the figure. x After the acid adding quantity and the acid removal quantity in each acid adding and acid removal period T x are calculated, the corresponding acid adding and acid removal are performed in each acid adding and acid removal period T x The final actual acid adding quantity in each acid adding and acid removal period T si is N x , and the final actual acid removal quantity in each acid adding and acid removal period T pj is N si . s i pj p j i , N j is a manual acid removal correction value. Under normal circumstances, N i and N j may be zero, N si = N s , N pj = N p , that is, the calculated acid adding quantity and acid removal quantity in each acid adding and acid removal period T x ​​​​​The amount of acid added within the specified time is taken as the actual amount of acid added, and each acid addition and discharge cycle T is recorded. x The calculated acid addition and removal amount is used as the actual acid removal amount. In abnormal situations where the calculated acid addition and removal amounts fail to meet quality requirements, an input box is added to the control interface. Users can manually adjust these amounts to ensure the final actual acid addition and removal amounts meet quality requirements. This setting offers high flexibility, allowing for convenient and timely human intervention to guarantee production quality in case of acid addition and removal anomalies.

[0043] This invention relates to a process control method for automatic acid addition and discharge in stainless steel pickling, which can be implemented, but is not limited to, using PLC programming software. By using simple PLC programming software to establish the calculation module, excessive communication transmission can be eliminated. This effectively avoids the problem of needing to connect a control model and production tracking information acquisition and processing module to a secondary (L2) computer system. The pickling module's associated conditions and related information can be directly calculated and transmitted for control on the primary (L1) computer system. This makes the system for implementing the automatic acid addition and discharge process control method for stainless steel pickling simpler, more convenient to operate, and has a wider application range, without being limited by system level.

[0044] This invention relates to a process control method for automatic acid addition and removal in stainless steel pickling. Different steel grades may have different calculated acid addition and removal coefficients. After calculating the acid addition and removal coefficients for each steel grade, these coefficients can be manually adjusted and preset for different steel grades to ensure they correspond to the current steel grade. Furthermore, while this method for automatic acid addition and removal in stainless steel pickling includes an automatic acid addition and removal module, it preferably also includes a manual acid addition and removal module. During operation, a switch button allows for easy switching between the automatic and manual acid addition and removal modules, providing multiple modes for convenient and flexible application.

[0045] For those skilled in the art, without departing from the concept of this invention, several simple deductions or substitutions can be made, and all such deductions or substitutions should be considered to fall within the scope of protection of this invention.

Claims

1. A process control method for automatic pickling and draining of stainless steel, characterized by: The method comprises the following steps: S1. Collecting data to form a data package, which comprises the acid adding amount corresponding to each strip quantity and the acid discharging amount corresponding to each strip quantity; S2. Formulating the acid adding coefficient and the acid discharging coefficient; The specific formulation steps comprise: S2.

1. Setting the acid adding and discharging period as T, detecting the running speed of the strip on the pickling production line as V, and the width of the strip as d, and calculating the strip quantity of the pickling production line in the acid adding and discharging period T according to the following formula: S=V*d*T*2, wherein S is the strip quantity of the pickling production line in the acid adding and discharging period T; S2.

2. Calling the data package collected in step S1, and formulating the acid adding coefficient and the acid discharging coefficient according to the following formula: k1=N1 / S, k2=N2 / S, wherein k1 is the acid adding coefficient, N1 is the acid adding amount corresponding to the strip quantity S in the data package, k2 is the acid discharging coefficient, and N2 is the acid discharging amount corresponding to the strip quantity S in the data package; S3. Set the pickling cycle as T x , pickling line operation work; pickling line operation work, repeat the calculation steps of the amount of acid and the amount of acid removal in the pickling cycle T x , calculate the amount of acid and the amount of acid removal in each pickling cycle T x , and after calculating the amount of acid and the amount of acid removal in each pickling cycle T x , the corresponding acid and acid removal are carried out in each pickling cycle T x , wherein the calculation steps of the amount of acid and the amount of acid removal in each pickling cycle T x , the calculation steps of the amount of acid and the amount of acid removal in each pickling cycle T S3.

1. The running speed of the strip steel on the pickling production line is measured as V. x The strip width is d x The measurement cycle T for acid addition and removal is calculated using the following formula. x Steel throughput within: S x =V x *d x *T x *2, where S x For adding acid removal cycle T x The amount of steel passing through; S3.

2. Calculate the acid addition and removal period T according to the following formula x N s = k1*S x , N p = k2*S x , where N s is the acid addition amount, and N x is the acid removal amount in the acid addition and removal period T p . x ​ 2. The process control method for automatic pickling and acid discharge of stainless steel according to claim 1, characterized in that: The strip is welded by multiple units, and a weld is formed at the welding position of the adjacent two units. A detection hole is arranged at each weld, and a weld detector is arranged at the inlet of the pickling production line to induct the detection hole.

3. The process control method for automatic pickling and acid draining of stainless steel according to claim 1, characterized in that: In step S3, the acid adding amount and the acid discharging amount in each acid adding and discharging period T x are calculated, and then the corresponding acid adding and discharging are performed in each acid adding and discharging period T x . The final actual acid adding amount in each acid adding and discharging period T x is N si , and the final actual acid discharging amount in each acid adding and discharging period T x is N pj . Wherein, N si = N s ± N i , N pj = N p ± N j , N i is the artificial acid adding correction value, and N j is the artificial acid discharging correction value.

4. The process control method for automatic pickling and acid discharge of stainless steel according to claim 1, characterized in that: The PLC programming software is used for programming.

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