Gas: heating and illuminating – Processes – Coal and oil
Patent
1996-04-02
1998-04-07
Kastler, Scott
Gas: heating and illuminating
Processes
Coal and oil
202248, C10J 300
Patent
active
057359172
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to a method for promoting carbonization in a door region and to the structure of an oven door which overcomes nonuniform carbonization during manufacture of coke in a chamber oven.
BACKGROUND OF THE INVENTION
As is well known, a method for manufacturing coke using a chamber oven is a method in which a carbonizing chamber is charged with coal and is heated by heat coming from combustion chambers on both of its sides through brick walls. It is known that coke which is manufactured by this method varies greatly in quality in the length, height, and width directions of the carbonizing chamber. Recently, increasing the effectiveness of carbonization in a coke oven and stabilizing the quality of coke have come to be considered very important, and improving the quality within carbonizing chambers and improving the carbonizing temperature have become important topics. In particular, as for the variation in quality of coke and variation in carbonization temperature in the lengthwise direction of an oven, there is a marked degree of variation in these properties in the door regions at the pusher side where coke is pushed and the coke side where coke is discharged, so unless an improvement in the nonuniform carbonization at these door regions is devised, it can be said that efficient carbonization and stabilization of the quality of coke in a coke oven are impossible.
FIG. 1 is a partially cross-sectional schematic view of a chamber oven 10. Normally, the carbonizing chamber 12 of a chamber oven 10 is formed from a space which is elongated in the horizontal direction having a length of 13-17 meters, a height of 4-7.5 meters, and a width of 0.4-0.5 meters and having an oven door 18 installed on the door region 16 on the rear side and the door region 16 on the front side. In order to make it easier for an unillustrated pusher to push coke to the outside of the oven after the completion of carbonization, the door region on the coke side has an increased width on the order of 50-80 mm.
As shown in the partially cross-sectional plan view in FIG. 2, an oven door 20 elongated in the vertical direction is installed on the door region 16. This oven door 20 is formed from a main metal frame 20a on the exterior, interior metal frame 20b connected thereto, and a heat insulating material 23 secured to the interior metal frame 20b. Whenever coke is pushed through the chamber, the doors 20 in the rear and front door regions 16 are removed and the door regions are exposed to the external air, and there is much heat dissipation. In addition, when coke is being pushed, the oven door 20 contacts the outside air and is cooled, and there is also much heat dissipation to the outside air from the oven door 20 itself which is again installed after the completion of coke pushing. As a result, the temperature of the door region falls by almost 100 degrees C. with respect to the average temperature of each combustion chamber.
For this reason, the charged coal in the vicinity of the oven ports is coked more slowly than coal at the center of the oven, so nonuniform carbonization is unavoidable.
As a means of solving the problems of nonuniform carbonization at the door regions, i.e., oven ports, countermeasures have been attempted such as increasing the amount of fuel gas supplied to the region of the combustion chamber adjoining the door regions compared to other portions or increasing the calories of the fuel gas to increase the temperature. However, there is a limit to how much the temperature of the combustion chamber can be increased, and conditions have not yet reached the point that an adequate effect has been achieved.
A method has been proposed in which the water content of the coal charged in the door regions is lowered with respect to the water content of coal charged in the center (Japanese Published Unexamined Patent Application No. Sho 60-32885). This method has been affirmed in principle, but a practical method has not been established for charging coal of different water contents into the
REFERENCES:
patent: 601468 (1898-03-01), Hilgenstock
International Search Report for PCT Application No. PCT/JP95/01536,, Nov. 14, 1995 (2 pp.)
Inoue Keizo
Kunimasa Hideyuki
Kastler Scott
The Japan Iron and Steel Federation
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