ABSTRACT

In this research work, thar coal was treated with NaOH solution in dissolved oxygen with different reaction parameters in an isothermal reactor. All three types of sulfur were removed from coal through oxidative alkali leaching under pressure. About 90% pyretic sulfur, 78% organic sulfur and 50% sulfate sulfur were removed, and more than 82% of total sulfur removal was achieved. Effects of various reaction parameters were observed, it was investigated that reaction time, agitation speed and partial pressure of oxygen have positive effects on the rate of desulfurization. Whereas desulfurization was increased with increase in reaction temperature and alkali concentration till optimum value as 120°C for temperature and 2.5 Molarity of NaOH solution for alkali concentration . While desulfurization was decreased with further increase in values of temperature and alkali concentration. The rate of desulfurization was observed maximum with minimum particle size of 40 µm. An Optimized reaction was performed reaction time 120°C oxygen partial pressure 200 psi, particle size 40 µm, NaOH concetration was 0.25 Molarity, reaction time was 3 hours agitation speed was 2000 rpm, after getting the optimum values of all reaction parameters. Processed and raw thar coal was characterized with Thermogravimetric Analysis (TGA) and Testo smoke number to investigate the combustion behavior of processed coal. It was observed that the combustion properties of processed coal were improved than that of raw coal and black smoke in processed coal was reduced.

摘要

在这项研究工作中，在等温反应器中，用溶解氧中的 NaOH 溶液处理煤，具有不同的反应参数。三种硫均通过加压氧化碱浸法从煤中去除。脱除约90%的热硫、78%的有机硫和50%的硫酸硫，总硫去除率达到82%以上。观察了各种反应参数的影响，研究了反应时间、搅拌速度和氧分压对脱硫率有积极影响。而脱硫随着反应温度和碱浓度的增加而增加，直至最佳值，即温度为120℃，碱浓度为2.5 NaOH溶液的摩尔浓度。而随着温度和碱浓度值的进一步升高，脱硫率降低。观察到脱硫速率最大，最小粒径为 40 µm。优化反应是在反应时间 120°C 氧分压 200 psi，粒径 40 µm，NaOH 浓度为 0.25 摩尔浓度，反应时间为 3 小时，搅拌速度为 2000 rpm 后，得到所有反应参数的最佳值。使用热重分析 (TGA) 和 Testo 烟度数对加工和原煤进行表征，以研究加工煤的燃烧行为。据观察，加工煤的燃烧性能比原煤提高，加工煤中的黑烟减少。观察到脱硫速率最大，最小粒径为 40 µm。优化反应是在反应时间 120°C 氧分压 200 psi，粒径 40 µm，NaOH 浓度为 0.25 摩尔浓度，反应时间为 3 小时，搅拌速度为 2000 rpm 后，得到所有反应参数的最佳值。使用热重分析 (TGA) 和 Testo 烟度数对加工和原煤进行表征，以研究加工煤的燃烧行为。据观察，加工煤的燃烧性能比原煤提高，加工煤中的黑烟减少。观察到脱硫速率最大，最小粒径为 40 µm。优化反应是在反应时间 120°C 氧分压 200 psi，粒径 40 µm，NaOH 浓度为 0.25 摩尔浓度，反应时间为 3 小时，搅拌速度为 2000 rpm 后，得到所有反应参数的最佳值。使用热重分析 (TGA) 和 Testo 烟度数对加工和原煤进行表征，以研究加工煤的燃烧行为。据观察，加工煤的燃烧性能比原煤提高，加工煤中的黑烟减少。反应时间为3小时，搅拌速度为2000转/分，得到所有反应参数的最佳值。使用热重分析 (TGA) 和 Testo 烟度数对加工和原煤进行表征，以研究加工煤的燃烧行为。据观察，加工煤的燃烧性能比原煤提高，加工煤中的黑烟减少。反应时间为3小时，搅拌速度为2000转/分，得到所有反应参数的最佳值。使用热重分析 (TGA) 和 Testo 烟度数对加工和原煤进行表征，以研究加工煤的燃烧行为。据观察，加工煤的燃烧性能比原煤提高，加工煤中的黑烟减少。