Features

Data Reconciliation

One of the most powerful features of the Monitor™ computer program is its ability to reconcile data without significant user intervention.

Monitor™ fouling calculations use measured plant temperatures and flowrates to calculate heat exchanger fouling factors. Data Reconciliation identifies inconsistencies in the input data and produces a more consistent set of data for the fouling calculations.

Data reconciliation uses an optimization procedure to minimize errors between hot and cold side duties of exchangers by adjusting given variables. At the same time, it minimizes the difference between calculated and target exit temperatures for mixers.

Exchangers and mixers that are included in the reconciliation are called "targets". Feed flowrates and temperatures and splitter ratios are the independent "variables" that are changed to achieve the targets.

Reconciliation output shows the duties calculated from the supplied flowrates and temperatures for each side of target exchangers and the differences between them. It also shows the differences between the target and calculated temperatures of the products of target mixers.

The same data are then shown after the reconciliation has been completed. The table shows by how much feed stream temperatures and flowrates and splitter ratios have been changed to achieve a reconciled data set.

** Input Data Balances **

Exchanger     Shell duty         Tube duty          Diff        % Diff
                  Gcal/hr           Gcal/hr        Gcal/hr
  E-201AB            5.55              4.53          1.019         18.36
  E-202              2.06              2.27          0.213          9.38
  E-206AB            5.50              2.05          3.440         62.55
  E-210EF            5.65              3.31          2.346         41.48
  E-111CD            8.13              2.59          5.534         68.05
  E-523              0.83              1.25          0.416         33.28
  E-232A             1.52              1.89          0.371         19.60
  E366AD            15.27             15.19          0.087          0.57

** Reconciliation Complete - Solution reached **

** Final Calculation Results **

Exchanger     Shell duty         Tube duty          Diff        % Diff
                  Gcal/hr           Gcal/hr        Gcal/hr
  E-201AB            4.53              4.53          0.000          0.00
  E-202              2.27              2.27          0.000          0.00
  E-206AB            2.05              2.05          0.000          0.00
  E-210EF            5.38              5.38          0.000          0.00
  E-111CD            3.96              3.96          0.000          0.00
  E-523              1.03              1.03          0.000          0.00
  E-232A             1.45              1.45          0.000          0.00
  E366AD            15.44             15.44          0.000          0.00

** Feed Streams **

------- Temperatures -------    -------- Flowrates ---------
  Stream      Old temp    New temp    Diff    Old flow    New flow  % Diff
                 °C          °C        °C       kg/hr       kg/hr
  CR1          128.52      128.52     0.00     598437.     598437.    0.00
  TPA0         188.14      190.29     2.15     520805.     425160.  -18.36
  LGO1         235.53      235.53     0.00     145474.     145474.    0.00
  VGO1         347.20      347.20     0.00      63657.      60547.   -4.88
  VMP0         244.68      244.68     0.00      42400.      34940.  -17.59
  MPA0         250.00      230.13   -19.86     315394.     315394.    0.00
  RES0         339.75      339.75     0.00     252637.     255316.    1.06

** Splitter Results **

Unit       Stream   Initial    Final        Stream   Initial    Final
  Split1     CR4       0.5000   0.1872        CR6       0.5000   0.8127
  Split2     CR12      0.5000   0.6176        CR10      0.5000   0.3823

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