Environmental Engineering Reference
In-Depth Information
Main Support Tools for the Evaluation Simulator of High Performance
Industrial Furnaces
Support programs
The area of opening/calculation program of radiation heat (radiation heat is calculated on the basis
of opening area)
Calculation program of the area of the furnace that radiates heat (the area of heat radiation is
calculated based on the shape of the furnace)
Calculation program of heat transfer volume through furnace wall (the heat transferred through the
furnace wall is calculated by one-dimensional heat transfer calculation)
The calculation program of steady heat transfer in a cylinder (calculation of the heat transfer volume
of skids)
Calculation program of the heat transfer coefficient of water tubes (the calculation of the heat transfer
coefficient on the water side of skids)
5.2.5 O
UTLINES
OF
S
YSTEM
O
PERATION
M
ETHOD
AND
S
IMULATION
R
ESULT
For the input data and the calculated results of this simulator, spreadsheet applica-
tions of PCs are used. Therefore, it is easy to reuse the calculated results. The topics
for the calculated results also contain the input data shown in
Figure 5.37
.
Figure
5.38
shows the processing flow of steel temperature calculation and the heat
balance model. This simulation program is applicable to high performance
furnaces as well as to conventional furnaces. A sample calculation was performed
5.6
.
Each figure in this table corresponds to one in
Table 5.5,
and sample data sheets
for Examples 1 and 2 are also shown in
Tables 5.7
and
5.8
.
Table 5.9
shows outputs
of the calculations based on the fuel consumption and the heat balance table in
addition to the aforementioned steel temperatures. In addition, the effects on fuel
consumption by different parameters can be calculated by applying two different
parameters relative to heat recovery rates and the length of furnace, as shown in
5.2.6 C
OMPARISON
OF
C
ALCULATION
AND
M
EASUREMENT
Using the programmed simulator, the calculations made and their results were
compared with actual measurements.
Tables 5.10
and
5.11
show the results of the
comparison; it is demonstrated that the simulation results correspond closely with
the figures actually measured.
Comparative studies of the performances of furnaces equivalent in scale with
the following example are carried out, selecting samples out of trial designs.
Comparisons were made of a high performance reheating furnace and a conventional
furnace for slabs of 285 ton/h; the results of a study are shown in
Figures 5.40
and
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