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Development of a Novel Shaft Dryer for Coal-Based Green Needle Coke Drying Process

1
School of Energy and Environmental Engineering, University of Science and Technology Beijing, Beijing 100083, China
2
Sinosteel Anshan Research Institute of Thermo-Energy Co., Ltd., Anshan 114044, Liaoning, China
3
Department of Thermal Engineering, School of Metallurgy, Northeastern University, Shenyang 110819, Liaoning, China
4
State Environmental Protection Key Laboratory of Eco-Industry, Northeastern University, Shenyang 110819, Liaoning, China
*
Author to whom correspondence should be addressed.
Appl. Sci. 2019, 9(16), 3301; https://doi.org/10.3390/app9163301 (registering DOI)
Received: 22 July 2019 / Revised: 1 August 2019 / Accepted: 8 August 2019 / Published: 12 August 2019
(This article belongs to the Section Applied Industrial Technologies)
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Abstract

The industry of coal-based green needle coke develops rapidly in recent years. The green coke produced by the delayed coking process usually has a moisture content of 10%–25%, which damages the calcining kiln and needle coke quality. A standing dehydration tank is currently used to reduce the moisture content of green coke. However, this process has several weaknesses such as unstable operation, large land area occupation, and low productivity. To solve this issue, a novel drying system with a shaft dryer proposed in this work is suitable for green coke drying. Moreover, the performances of the green coke are investigated to design the proposed shaft dryer. The experimental result shows that the average vertex angle of the pile of green cokes is 109.2°. The pressure drop of the dryer increases linearly with the green coke bed height, and the green coke with a larger size has a smaller pressure drop. The specific pressure drops are 5714, 5554, 5354, and 5114 Pa/m, with median green coke sizes of 26.85, 29.00, 30.45, and 31.80 mm, respectively. Tooth spacing is another important parameter which influences the mass of green coke leakage. The optimal tooth spacing and rotary speed of the rollers are determined by the required production yield. View Full-Text
Keywords: green coke; coal-based needle coke; shaft dryer; drying process green coke; coal-based needle coke; shaft dryer; drying process
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Xie, G.; Zhang, X.; Cai, J.; Sun, W.; Zhang, K.; Zhang, S. Development of a Novel Shaft Dryer for Coal-Based Green Needle Coke Drying Process. Appl. Sci. 2019, 9, 3301.

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