Development of a technology for the production of hydrogen-enriched synthesis gas with waste-free processing of Ekibastuz coal

Sultan Ybray, Arystan Dikhanbaev, Bayandy Dikhanbaev, Almagul Mergalimova and Aleksandar Georgiev

Energy, 2023, vol. 278, issue PA

Abstract: This work aims to develop a unit of a new generation “reactor inversion phase-rotary kiln-gasifier” that enables: extraction from the slag 70% of Ge, Zn, and non-ferrous metals into sublimates; recovering 75% of iron, and using it as a reagent for creating additional mole of hydrogen; obtaining a smelt suitable for the production of building materials. A novel method for thermodynamic calculation of steam gasification of iron makes it possible to predict the specific yield of hydrogen by 63% more than with coal gasification is developed. During experiments on Ekibastuz coal, it is obtained syngas with a ratio H2/CO = 6.0 which is 2–3 times higher than in traditional gasifiers. It is predicted that in the case of joint coal-iron gasification, a ratio of H2/CO will be higher. The melting unit produces combustible gas with a calorific value of 7.0 MJ/nm3 and allows coal-iron gasification in fuel-free mode. An assessment shows: with the maximum wholesale price of natural gas (NG) on the market at 0.062$/m3, and in equivalent characteristics in relation to the NG, the cost of syngas produced in the system will be 0.025$/m3, which is 2–3 times lower than the cost of NG in Kazakhstan.

Keywords: High-hydrogenous syngas; Reactor inversion phase; Waste-free technology; Germanium; Dust-like gold (search for similar items in EconPapers)
Date: 2023
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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:278:y:2023:i:pa:s0360544223012112

DOI: 10.1016/j.energy.2023.127817

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