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| Analysis and case on material conversion utilization #br# of byproduct gases in steel industry |
| SHANGGUAN Fangqin1,GAN Lei2,ZHOU Jicheng1,GUO Yuhua1,ZHANG Chunxia1,LI Xiuping1 |
(1. State Key Laboratory of Advanced Steel Processes and Products, Central Iron and Steel Research Institute,
Beijing 100081, China;2. School of Metallurgy and Chemical Engineering, Jiangxi University of Science
and Technology, Ganzhou 341000, Jiangxi, China) |
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Abstract A large amount of byproduct gases, i.e. COG, BFG and LDG, were produced during the steel manufacturing process. And the quantity of energy contained in the byproduct gases accounts for about 70% of the total quantity of secondary energy in the steel plant. Thus, byproduct gases play a very important role in energy balancing in the steel plant. At present, most of byproduct gases are used as fuels in the steel plant. However, another highadded value utilization direction is to exploit the potential value of Carbon and Hydrogen, i.e. H2, CmHn, CO, etc., and then to realize material conversion and resource utilization. However, analysis of energy flow (byproduct gas flow) and optimization of its network are the core issues of material conversion utilization of byproduct gases in steel plants. By this means, byproduct gases can be used to produce many kinds of chemical products, such as hydrogen gas, methanol, LNG, SNG, CNG, ammonia, dimethyl ether, ethylene glycol, olefin, etc.. Based on the case study on methanol production by using COG and LDG as raw materials in Dazhou Steel, it is indicated that through material conversion utilization of byproduct gases, not only byproduct gases will be high efficiency utilized, but also obvious economic and environmental benefits will be brought into the steel plant.
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