煤气化过程中产生的气化渣的处置问题日趋严重。气化渣中的残余炭具有较发达的孔隙结构和较大的比表面积,具有制备活性炭和其他高附加值碳材料的潜质。通过水介重力分选方法得到高品质气化渣分离炭后,采用配煤法制备脱硫活性焦,可实现气化渣的高附加值利用。通过单因素试验法及正交试验法考察在气化渣分离炭高掺比条件下配煤种类、比例及炭化、活化工艺条件对脱硫活性焦结构和性能影响。研究表明,气化渣分离炭在掺入比例为50%时,活性焦的最佳配煤组成为:焦煤29%、长焰煤8%、煤沥青13%;最佳炭化条件为:升温速率5℃/min、炭化温度700℃、炭化时间30min;最佳活化条件为:活化温度900℃、升温速率8℃/min、活化时间120min、活化水量1.0mL/(g·h)。利用固定床反应装置对气化渣基脱硫活性焦进行脱硫和再生性能评价,在最佳配方和工艺条件下,公斤级试验制备的脱硫活性焦耐磨强度为97.26%,耐压强度为696.3N(实测值),灰分为11.66%,碘吸附值为378.78mg/g,脱硫值为28.5mg/g,满足脱硫用煤质颗粒活性炭指标A型优级品的技术指标且再生性能良好。以气化渣分离炭作为碳源制备脱硫活性焦在大幅降低活性焦生产成本的同时,也为气化渣的高值化利用提供了一条可行途径,对气化渣的减量化、资源化、高值化利用具有重要意义。

sidual carbon in the gasification slag developed pore structure and large specific surface area, which had the potential to prepare activated carbon and other high value-added carbon materials, and the full utilization of residual carbon could realize the sustainable use of carbon resources. After obtaining high quality separated carbon by water-mediated gravity separation, gasification residue-based desulfurization activated coke was prepared by coal blending method based on gasification residue separated carbon, which could realize the high value-added utilization of gasification residue. The effects of coal type, coal ratio, carbonization and activation process conditions on thestructure and performance of desulfurization activated coke under the condition of high mixing ratio of gasification residue separated carbonwas investigated by one-way and orthogonal experiments respectively. The study showed that the optimal coal composition of activated cokefor gasification residue separated carbon at a blending ratio of 50% was 29% coking coal, 8% long-flame coal, and 13% coal pitch; Theoptimal carbonization conditions were as follows: heating rate of 5 ℃ / min, carbonization temperature of 700 ℃ and carbonization time of30 min; The optimal activation conditions were: activation temperature 900 ℃ , heating rate 8 ℃ / min, activation time 120 min, activatedwater volume 1.0 mL/ (g·h). Evaluation of desulphurisation and regeneration performance of gasified slag-based desulphurisation activated coke using a fixed-bed reaction unit. Under the optimal formulation and process conditions, the desulfurization activated coke preparedin the kilogram experiments had an abrasion strength of 97.26%, a compressive strength of 696.3 N(measured value), an ash content of11.66%, an iodine adsorption value of 378.78 mg/ g, and a desulfurization value of 28.5 mg/ g, which meet the requirements for desulfurization of coal particles. Technical specifications of A-type good grade of coal granular activated carbon for desulphurisation was satisfedand regeneration performance was good. The preparation of desulfurisation activated coke using gasification residue separated carbonas carbon source significantly reduces the production cost of activated coke, and at the same time provides a feasible way for the high valueutilisation of gasification residue, which is of great significance for the reduction, resourcing and high value utilisation of gasification residue.

0 引言

1 原料与方法

   1.1 原料煤

   1.2 脱硫活性焦制备方法

   1.3 活性焦脱硫性能评价方法

   1.4 活性焦再生性能评价方法

2 配煤比例对脱硫活性焦炭化料强度影响

   2.1 焦煤添加量对脱硫活性焦炭化料强度影响

   2.2 长焰煤添加量对脱硫活性焦炭化料强度影响

   2.3 煤沥青添加量对脱硫活性焦炭化料强度影响

3 炭化工艺条件对脱硫活性焦炭化料强度的影响

   3.1 炭化温度

   3.2 炭化时间

   3.3 炭化升温速率

4 活化条件对脱硫活性焦比表面积的影响

5 气化渣基脱硫活性焦性能表征与分析

   5.1 物理强度

   5.2 碘吸附值

   5.3 工业分析和灰成分分析

   5.4 脱硫性能

   5.5 孔结构分析

   5.6 经济性评价

   5.7 再生性能评价

6 结论