Environmental Engineering Reference
In-Depth Information
TABLE A.1
Items of Investigation
1.
Kind of industrial furnace
2.
Time of installation
3.
Type of furnace (batch, continuous)
4.
Type of heating
5.
Heating capacity
6.
Heat treating material
7.
Annual treating amount
8.
Average heating temperature
9.
Kind of main heat source
10.
Annual heat consumption by heat source
11.
Unit heat consumption by heat source
12.
Air ratio
13.
Air preheater presence
14.
Air temperature after preheating
15.
Annual operation time
16.
Heat efficiency
17.
Number of industrial furnaces of the same specification
have caused incorrect calculation results on heat efficiency or energy unit consump-
tion, if the calculations were conducted based only on the data obtained by the
questionnaires.
A.3 RESULTS OF INVESTIGATION
A.3.1 R
Q
U
ESULTS
OF
THE
UESTIONNAIRE
WITH
SERS
We sent the questionnaire to 8800 works. The questions focused on the current
status of industrial furnace installation. We received replies from 2021 works, of
which 513 use industrial furnaces with capacities over 500 Mcal/h or 50 kVA.
The number of installed industrial furnaces by types of industries and the annual
energy consumption is shown in
Figure A.1
.
The number of installed industrial
furnaces by types of furnaces and annual energy consumption is shown in
Figure
of industries in relation to the heating capacities (ton/h); typical examples are
shown in
Figure A.3
.
A.3.2 R
I
U
ESULTS
OF
NTERVIEW
WITH
SERS
Results of the on-site interviews concerning the relationship among fuel unit
consumption, heat efficiency, and heating capacities (ton/h) are shown in
Figures
A.4
through A.8. In most cases, both the fuel unit consumption and the heat
efficiency show greater improvement, the higher the heating capacity. The values
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