废氧化铁脱硫剂再生工艺进展

Progress in Regeneration Technology of Waste ZnO Desulfurizer

目前,中国北方空气污染比较严重,大气颗粒物PM2.5等造成的雾霾天气频繁出现在大城市,严重影响到人们的健康生活。煤炭燃烧过程中产生的SO2、氮氧化合物、PM2.5等是这些雾霾天气产生的重要原因。煤基多联产是一种先进的节能、清洁煤电技术。在这种技术中,煤气化后,产生大量氮氧化物和硫化物气体。在工业生产中,广泛采用脱硫剂,除去有害的硫化氢气体。氧化铁脱硫剂是一种中高温气体脱硫剂,由于储量大、硫容高、价格低、反应活性好,在国内外得到了广泛的研究和应用。脱硫剂脱硫后会形成硫化物,如果不进行再生处理,会导致脱硫成本高。此外,废脱硫剂堆积不仅会占用大量土地,而且对生态环境造成污染。研究脱硫剂的再生工艺不仅可以减少环境的负担,而且可以变废为宝,实现资源的循环利用,带来经济和社会效益。本文将综述脱硫剂中,主要的高温脱硫剂--铁基脱硫剂的再生工艺。

At present, China’s air pollution is relatively serious, the representative of atmospheric particulate matter PM2.5 caused by the frequent haze weather in big cities, has seriously threatened people’s life and health. SO2, NOX, PM2.5 and PM10 produced in the process of coal combustion are the important causes of these haze weather. Large-scale coal-based power generation is regarded as an advanced energy-saving and clean coal-power technology which combines coal-collecting chemical industry and thermal power generation organically. In the integrated combined cycle power generation system, a large number of nitrogen oxides and sulfur compounds are produced after the gasification of raw coal. In industrial production, desulfurizer is widely used to remove harmful hydrogen sulfide gas. Iron oxide desulfurizer, as a medium and high temperature gas desulfurizer, has been widely studied and applied at home and abroad for its abundant reserves, low price, excellent thermodynamic performance, high sulfur capacity and reactivity, and high desulfurization efficiency. Desulfurizer after desulfurization will form sulfide, if not carried out regeneration treatment, will lead to high operation cost of desulfurization process. In addition, the accumulation of waste desulfurizers will not only occupy a lot of land, but also cause pollution to the ecological environment. Research on the regeneration process of desulfurizer can not only reduce the environmental burden, but also turn waste into report, realize the recycling of resources and bring economic and social benefits. This paper reviews the regeneration process of iron-based desulfurizer, which is the main desulfurizer in high temperature.