1.
 The Effect of End Temperature on Coke Qualities
  

889 HWAHAK KONGHAK Vol. 38, No. 6, December, 2000, pp. 889-892

(Journal of the Korean Institute of Chemical Engineers)

     

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(2000 4 18 , 2000 9 4 )

The Effect of End Temperature on Coke Qualities

Kyong-Ho Yoon^†, Ki-Hong Kim and Yong-Kuk Lee

Energy & Chemical Process Research Team, Research Institute of Industrial Science & Technology (Received 18 April 2000; accepted 4 September 2000)



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Abstract−This study was performed to investigate the relationship between the coke end-temperature and coke quality by blending 20 kg low cost coal in the range of 15-40 wt%. Increasing the coke end temperature did not necessarily improve the coke quality at constant mixing ratios of low cost coal. Both inner pore of coke, produced by rapid evaporation of volatile matter caused by fast coking rate, and the thermal stress in high temperature resulted in deterioration in coke quality. There was the coke end-temperature for coke quality to be the most qualified within studied temperatures. As portion of low cost coal in the mixture increased, coke quality decreased and the range of coke end-temperature in which coke quality became maximum transferred to higher temperature. These observations could be explained in terms of coke heat quantity and coal mid-temperature.

Key words: Coke Oven, Low Cost Coal, Coke End Temperature, Coke Quality

†E-mail: khyoon@rist.re.kr

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1. Control panel 5. Heating furnace 8. Motor

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3. Gas outlet pipe 7. Coal bucket 10. Blower 4. Heater

Table 1. Mixing ratios of coal for test

Coal Mixing ratios(%)

CW FR LC GC GY GP KW MW

15 15 18 17 20 10 15 10

15 13 17 17 18 10 10 10

12 13 17 17 17 19 10 15

10 13 17 15 16 19 15 15

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low cost coal(%)

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Fig. 2. Characteristics of volatile matter and fluidity of coal as a func- tion of mixing ratio(see text).

Fig. 3. The effect of coke end temperature on coke quality for 15% low cost coal.

Fig. 4. The effect of coke end temperature on coke quality for 15-40%

low cost coal.

Table 2. The effect of mixing ratios of low cost coal on coke heat quan- tities

Mixing ratios of low cost coal(%) Coke heat quantities(kcal/kg) 15

20 25 30 35 40

369 374 376 380 382 385

Fig. 5. The effect of ratios of low cost coal on coal mid-temperature.

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