Preparation process and performance evaluation of gasification slag-based desulfurization activated coke
The problem of disposal of coal gasification slag produced in the coal gasification process is becoming increasingly serious.Re-sidual carbon in the gasification slag developed pore structure and large specific surface area,which had the potential to prepare activa-ted carbon and other high value-added carbon materials,and the full utilization of residual carbon could realize the sustainable use of car-bon resources.After obtaining high quality separated carbon by water-mediated gravity separation,gasification residue-based desulfuriza-tion activated coke was prepared by coal blending method based on gasification residue separated carbon,which could realize the high val-ue-added utilization of gasification residue.The effects of coal type,coal ratio,carbonization and activation process conditions on the structure and performance of desulfurization activated coke under the condition of high mixing ratio of gasification residue separated carbon was investigated by one-way and orthogonal experiments respectively.The study showed that the optimal coal composition of activated coke for gasification residue separated carbon at a blending ratio of 50%was 29%coking coal,8%long-flame coal,and 13%coal pitch;The optimal carbonization conditions were as follows:heating rate of 5℃/min,carbonization temperature of 700℃and carbonization time of 30 min;The optimal activation conditions were:activation temperature 900℃,heating rate 8℃/min,activation time 120 min,activated water volume 1.0 mL/(g·h).Evaluation of desulphurisation and regeneration performance of gasified slag-based desulphurisation activa-ted coke using a fixed-bed reaction unit.Under the optimal formulation and process conditions,the desulfurization activated coke prepared in the kilogram experiments had an abrasion strength of 97.26%,a compressive strength of 696.3 N(measured value),an ash content of 11.66%,an iodine adsorption value of 378.78 mg/g,and a desulfurization value of 28.5 mg/g,which meet the requirements for desulfu-rization of coal particles.Technical specifications of A-type good grade of coal granular activated carbon for desulphurisation was satisfed and regeneration performance was good.The preparation of desulfurisation activated coke using gasification residue separated carbon as carbon source significantly reduces the production cost of activated coke,and at the same time provides a feasible way for the high value utilisation of gasification residue,which is of great significance for the reduction,resourcing and high value utilisation of gasification resi-due.
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