THE YEAR-BOOK OF THE COKE OVEN - Coke-oven-managers.org
THE YEAR-BOOK OF THE COKE OVEN - Coke-oven-managers.org
THE YEAR-BOOK OF THE COKE OVEN - Coke-oven-managers.org
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Age of the Production Units<br />
Since 2003 European suppliers of coke plants have realized order intakes<br />
for approx. 30 mill. mt/year in total, reflecting 21 million mt for reinvestments<br />
and 9 million mt for extensions. Only re-investments have<br />
taken place in Japan within 8 projects for approx. 5 million mt. This is<br />
caused by the comparably high age of Japanese plants with more than 36<br />
years on average in comparison to the worldwide average of approx. 26<br />
years. Due to intensive preventive maintenance coke <strong>oven</strong> batteries in<br />
Japan are of an extremely high age. This is illustrated in figure 3 showing<br />
the age distribution with almost 80% of <strong>oven</strong>s older than 30 years.<br />
2000<br />
1600<br />
1200<br />
800<br />
400<br />
0<br />
Number of <strong>oven</strong>s<br />
2.6 %<br />
4.2 %<br />
14.0 %<br />
< 20 20 - 25 25 - 30 30 - 35 35 - 40 > 40<br />
Years Takahashi Miwa / NSC, 4th ICSTI, Osaka, November 2006<br />
4<br />
39.5 %<br />
33.7 %<br />
Figure 3 Age distribution of Japanese coke <strong>oven</strong> batteries 3<br />
Decisions for High-Capacity Ovens<br />
(Capital and Operation Cost/Lifetime)<br />
6.0 %<br />
The development of high-capacity <strong>oven</strong>s is illustrated in figure 4. Starting<br />
with less than 10 mt per charge and comparably small chamber volumes in<br />
1900 the modern high capacity <strong>oven</strong>s with more than 90 m³ volumes are<br />
producing more than 50 mt per <strong>oven</strong>.
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