Results of Investigations on the Current State of Japanese Industrial Furnaces - High Temperature Air Combustion: From Energy Conservation to Pollution Reduction - page 376

The value for the energy consumption corresponds to 23% of the final
heat consumption, 46% of that in total industries, and 65% of that in
industrial furnaces (excluding industrial boilers).
3. As shown in Table A.11 , by introducing the results of the development
of the high performance industrial furnaces the heat efficiency can be
improved overall by 50% (from the current average of 35 to 53%), that
of the petroleum heating furnaces by 15% (from the value of 78 to 90%),
and that of industrial boilers by 6% (from the value of 85 to 90%); further,
as a result energy savings of 17.9

10 9 l/year can be achieved. The value
corresponds to 4.8% of the grand total energy consumption — = 17.9

×

×

10 9 /376 × 10 9 × 100(%).

A.6 SUMMARY

Japan Industrial Furnace Manufacturers Association is promoting activities of Devel-
opment of a High Performance Industrial Furnace Project, which is a national project
that has investigated the number of installed industrial furnaces, energy consumption,
heat efficiency, etc., to clarify the effect of energy saving by introducing the results
of the development. The results obtained are as follows:

1. The results of questionnaires for users of industrial furnaces showed that

the number of facilities of industrial furnaces (excluding boilers and incin-
erators) is about 39,300 furnaces over 50 l/h of converted crude oil, or 50
kVA, and 35,300 furnaces over 50 l/h converted crude oil, or 200 kVA.
Compared with the official data such as the number of facilities reported
under the law of preventing air pollution or the investigation data of the
Agency of Natural Resources and Energy, these values are reasonable.

2. The results of the questionnaires of users of industrial furnaces indicate

that energy consumption (the consumed amount) of industrial furnaces
(excluding boilers and incinerators) is annually 75 10 9 l (converted crude

oil). Compared with the official data such as the statistical data of petro-
leum consumed structure (MITI) or the investigational data of the Agency
of Natural Resources and Energy, these values are reasonable.

×

3. The results of the user interviews indicate that the heat efficiencies of metals-

heating furnaces, metal heat treatment furnaces, and aluminum-melting
furnaces average 26% for small-scale industrial furnaces, 35% for middle-
scale, 43% for large-scale, and 35% on total average. Comparing continuous
and batch furnaces, the heat efficiencies of continuous furnaces are higher
than those of batch furnaces by 43 and 28%, respectively.

4. The energy-saving effects of introduction of the results of the development

of high performance industrial furnaces are estimated as follows:
a. The number of industrial furnaces: 65,100 furnaces (including 32,000
industrial boilers)