Patent ID: 11900255
Assignee: UNIVERSITY OF SCIENCE AND TECHNOLOGY BEIJING
Field: Computer technology (Electrical engineering)
Classification: CPC G  Y | IPC G

Claim 6:
7. The method according to claim 1, wherein in step S8, the amount of alloy added is solved by integer linear programming, specifically including:, min
      ⁢
      Z
     
     =
     
      
       
        ∑
        
         i
         =
         1
        
        n
       
        
       
        
         x
         i
        
        ·
        
         r
         i
        
       
      
      =
      
       
        
         
          
           x
           1
          
          ·
          
           r
           1
          
         
         +
         
          
           x
           2
          
          ·
          
           r
           2
          
         
         +
        
        ...
       
          
       +
       
        
         x
         n
        
        ·
        
         r
         n
        
       
      
     
    
   
   
    
     (
     4
     )
    
   
  
 

where: ri represents the unit price of the i-th alloy material; xi is the amount of the i-th alloy added;
at the same time, the following constraints must be met:, s
     .
     t
     .
     
      {
      
       
        
         
          
           min
           ⁡
           (
           
            g
            1
           
           )
          
          ≤
          
           
            
             
              ∑
              
               j
               =
               1
              
              n
             
              
             
              
               x
               j
              
              ⁢
              
               c
               
                1
                ⁢
                j
               
              
              ⁢
              
               η
               i
              
             
            
            P
           
           +
           
            b
            1
           
          
          ≤
          
           max
           ⁡
           (
           
            g
            1
           
           )
          
         
        
       
       
        
         ⋮
        
       
       
        
         
          
           min
           ⁡
           (
           
            g
            i
           
           )
          
          ≤
          
           
            
             
              ∑
              
               j
               =
               1
              
              n
             
              
             
              
               x
               j
              
              ⁢
              
               c
               ij
              
              ⁢
              
               η
               i
              
             
            
            P
           
           +
           
            b
            i
           
          
          ≤
          
           max
           ⁡
           (
           
            g
            i
           
           )
          
         
        
       
       
        
         ⋮
        
       
       
        
         
          
           min
           ⁡
           (
           
            g
            m
           
           )
          
          ≤
          
           
            
             
              ∑
              
               j
               =
               1
              
              n
             
              
             
              
               x
               j
              
              ⁢
              
               c
               mj
              
              ⁢
              
               η
               i
              
             
            
            P
           
           +
           
            b
            m
           
          
          ≤
          
           max
           ⁡
           (
           
            g
            m
           
           )
          
         
        
       
      
     
    
   
   
    
     (
     5
     )
    
   
  
 

where: P is the total weight of molten steel; xj is the addition amount of j-th alloy; gi is the content of element i; min represents the lower limit value; max represents the upper limit value; bi represents the content of elements i before alloying; cij refers to the content of element i in alloy j; ηi is the yield of element i;
the alloy addition must meet the following non-negative conditions:

{right arrow over (X)}=(X1,X2, . . . ,XJ, . . . ,Xn)T,xj≥0  (6)

the maximum value of alloy addition less than the amount of alloy that can be added is:

xj≤Lj  (7)

where: Lj represents the maximum amount of alloy j added in actual production;
as the preferred scheme of the method for determining the alloy addition amount in the converter tapping process described in the present invention, the element recovery rate is calculated by 100%, except for Si, Mn and Cr elements predicted according to step S7.