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半水煤气脱硫的好坏,对化肥生产有着十分重要的作用。采用活性炭脱硫,不但能同时脱除半水煤气中的硫化氢及有机硫化合物,而且具有脱硫效果好,设备简单及操作简便等优点。活性炭的再生,采用过热蒸汽(0.2—0.5大气压,350—400℃)再生后,也能克服过去用硫化铵溶液再生时设备庞大,操作复杂,制备硫化铵的原料硫化钠货源短缺等缺点。因此采用过热蒸汽再生后,活性炭脱硫是一个有发展前途的脱硫方法。脱硫用的颗粒状活性炭,目前国内外主要以粉末状烟煤(制成的活性炭主要脱除硫化氢)或无烟煤(制成的活性炭主要脱除有机硫化合物)为原料,用煤焦油粘结成型,然后在800—900℃用水蒸汽活化制成。由于采用煤焦油为粘合剂及高温蒸汽活化,限制了颗粒状活性炭的大量生产,价格也较贵。如果在化肥工业中普遍采用活性炭脱硫,则颗粒状活性炭的需用量十分巨大,按目前情况很难满足这一要求。因此探索廉价脱硫用颗粒状活性炭的制备方法,显得十分迫切和需要。
Semi-water gas desulfurization is good or bad, the production of fertilizers has a very important role. The use of activated carbon desulfurization can not only simultaneously remove the hydrogen sulfide and organic sulfur compounds in the semi-water gas, but also has the advantages of good desulfurization effect, simple equipment and easy operation. Regeneration of activated carbon, after overheated steam (0.2-0.5 atm, 350-400 ℃), can overcome the shortcomings of the shortage of supply sources of sodium sulfide, such as large equipment and complicated operation, and the preparation of ammonium sulfide when regenerated with ammonium sulfide solution in the past. Therefore, the use of superheated steam regeneration, activated carbon desulfurization is a promising method of desulfurization. Currently, granular activated carbon for desulfurization is mainly made from powdered bituminous coal (activated carbon mainly produced by hydrogen sulfide removal) or anthracite (activated carbon produced mainly from organic sulfur compounds) Then activated at 800-900 ° C with steam. The use of coal tar as a binder and high-temperature steam activation, limiting the mass production of granular activated carbon, the price is more expensive. If activated carbon desulfurization is commonly used in the fertilizer industry, then the required amount of granular activated carbon is very large, so it is difficult to meet this requirement according to the current situation. Therefore, it is very urgent and necessary to explore the preparation method of granular activated carbon for cheap desulfurization.