A New Clean Coal Technology by Mild Modification at Low Temperature

低温温和改性洁净煤新技术

• 批准号: 13650828
• 负责人: MAE Kazuhiro
• 金额: $ 2.24万
• 依托单位: KYOTO UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2001
• 资助国家: 日本
• 起止时间: 2001 至 2002
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-13650828/
• 关键词: Coke oven gas; Desulfurization; Utilization of waste iron; Nano-size particle; Steam gasification; FeOOH

In order to develop a new method for producing a high performance absorbent of H_2S based on the waste and low rank coal, we performed the following items:(1) Proposal of a new preparation method of absorbent.(2) Performance of the removal of H_2S by a new absorbent.(3) Application of iron wastes in steel factory.First, we tried a new method to produce an absorbent of H_2S as follows: The low rank coal was oxidized for 2 h at 70 ℃ by nitric acid to introduce a large amount of carboxyl functional group and was exchanged by Fe ion. The Fe-exchanged coal was pyrolyzed at 500 ℃ and gasified at 800 ℃ under steam. Though the treatment the type of Fe changed into FeC after pyrolysis and Fe_3O_4 after gasification. The weight content of Fe after gasification was ca. 80 %. We found that the Fe_3O_4 particles of 20-50 nm in size were highly dispersed in the Fe/carbon complex from the observation by SEM. Thus, an attractive Fe/carbon complex was successfully produced.Next, we examined the performance of Fe/carbon complex as a absorbent of H_2S. We compared the de-H_2S profiles of new and conventional absorbents. A absorbent prepared by the proposed method had a high performance of desulfurization. From the X-ray analysis the Fe_3O_4 was converted into FeS after exposing by H_2S. It was supposed that the high performance of a new absorbent was brought about by physical (the highly dispersed nano particles) and chemical (pure Fe_3O_4) properties of Fe/carbon complex.Finally, we applied the proposed method to iron wastes in steel factory such as iron sludge and dust. It was found that these wastes were significantly absorbed H2S. Furthermore, we confirmed that the adsorbent prepared by the proposed method form these wastes had a high de-H_2S performance. Thus it was clarified that the proposed method is effective for producing a high performance absorbent of H_2S.

为了开发一种利用废煤和低阶煤制备高性能H_2S吸附剂的新方法，我们进行了以下工作：(1)提出了一种新的吸附剂制备方法。(2)新型吸附剂对h2s的去除性能。(3)废铁在钢铁厂的应用。首先，我们尝试了一种新的H_2S吸附剂的制备方法：将低阶煤在70℃下用硝酸氧化2 h，引入大量的羧基官能团，并以Fe离子交换。铁交换煤在500℃下热解，在800℃下蒸汽气化。经处理后，热解后的铁为FeC，气化后的铁为Fe_3O_4。气化后铁的重量含量约为80%。SEM观察发现，Fe_3O_4颗粒高度分散在Fe/碳配合物中，粒径为20 ~ 50 nm。因此，成功地制备了具有吸引力的铁/碳配合物。接下来，我们考察了铁碳配合物作为H_2S吸附剂的性能。我们比较了新吸收剂和常规吸收剂的脱氢2s谱。用该方法制备的吸附剂具有良好的脱硫性能。x射线分析表明，Fe_3O_4经H_2S照射后转化为FeS。认为这种新型吸附剂的高性能是由铁碳配合物的物理性质（高度分散的纳米粒子）和化学性质（纯净的Fe_3O_4）共同作用的结果。最后，将该方法应用于炼钢厂的铁渣、铁尘等铁废物。结果表明，这些废弃物对H2S的吸收效果显著。此外，我们证实了用该方法从这些废物中制备的吸附剂具有较高的脱h_2s性能。结果表明，该方法是制备高性能H_2S吸附剂的有效方法。