THE YEAR-BOOK OF THE COKE OVEN - Coke Oven Managers ...

Sl.
No.
Oven
No.
Wt. Of
Coal
Charge
( MT )
Charging
( A )
Pushing ( B )
Date Time Date Time
Carbon
-ization
(Hours)
Time
(B-A)
Next Charging
( C )
Date
Time
Time
between
pushing
to next
charging
(Hours),
(C-B)
Cycle
time ,
(Hours)
(C-A)
Empty
oven
temp.
prior to
charging
, ( 0 C)
Carbon
-ization
Temp.
( 0 C)
Quenching
time,
(Min.)
1 25 5.500 16.9.03 18.30 18.9.03 6.00 35.30 18.9.03 8.45 2.45 38.15 640ºC 935ºC 50
2 25 5.500 18.9.03 8.45 19.9.03 17.00 32.15 19.9.03 19.15 2.15 34.30 650ºC 943ºC 40
3 25 5.500 19.9.03 19.15 21.9.03 2.30 31.15 21.9.03 5.00 2.30 33.45 640ºC 940ºC 45
4 27 5.500 15.9.03 24.00 17.9.03 10.45 34.45 17.9.03 12.45 2.00 35.45 660ºC 960ºC 55
5 27 5.500 17.9.03 12.45 18.9.03 23.30 34.45 19.9.03 1.40 2.10 36.55 630ºC 950ºC 48
6 27 5.500 19.9.03 1.40 21.9.03 12.40 35.00 21.9.03 14.25 1.45 36.45 680ºC 975ºC 40
Table 2: Some typical data of beehive coke oven operation during initial period
Processes for coal receiving, storing, crushing, blending and charging were
developed and implemented across all beehive ovens at Dhanbad and Ramgarh
area. Quality assurance systems for coal handling, carbonization operation and
coke handling were developed and implemented in all beehive ovens. Written
procedures were made for quality assurance activities for incoming raw
materials (coal), in process materials (coal/coke) and product coke. Series of
training sessions were organized by Tata Steel experts for all staffs of beehive
ovens, conversion agency and third party quality assurance (QA) agency.
Frequent audits were conducted by Tata Steel personnel on various activities
starting from coal dispatch to coke received. Flow chart of various activities
under new quality assurance system starting from Tata Steel washeries to
beehive ovens for coke conversion and coke dispatch from beehive ovens to
Jamadoba siding and Jamshedpur works of Tata Steel India are represented in
figures 3 - 5.
Temporary/permanent sheds were erected for coal & coke storage to prevent
moisture gain during rains in all beehive ovens. For proper identification, coals
received from different sources were stock-piled source-wise with different
geometrical shapes and proper identification marks. Demarcation between
individual coals and blended coal were maintained. Individual coals were not
allowed to be stored nearer to blended coal to avoid mix-ups. The quantities of
crushed coal for blending were ensured according to the capacity of oven before
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