半焦协同活化及活性半焦用于烟气脱硫脱硝的实验研究
发布时间：2018-12-15 19:19
【摘要】：燃煤烟气中的SO_2、NO等污染物的大量排放造成了光化学烟雾、酸雨等与人类健康息息相关的诸多问题,是造成大气污染的主要原因。因此对烟气污染物排放的控制和治理刻不容缓,而如何经济、高效的进行脱硫脱硝是我国环保工作的难题。干法脱硝脱硫技术由于其催化剂可回收循环利用、无二次污染、净化效率高、占地面积小等优点从众多烟气脱硫脱硝技术中脱颖而出,成为未来烟气洁净技术发展的趋势。活性炭是烟气干法脱硫脱硝的主要催化剂载体,具有协同脱除烟气污染物、占地面积小、使用温度低等优势,但较高的投资及净化费用限制了其发展。我国半焦资源丰富,是煤粉炉热解多联产系统中的主要产物之一,其清洁及高效利用亟需解决,半焦用于脱硫脱硝等污染物处理领域,为其合理利用开辟了一条新的道路。相比于活性炭,活性半焦具有原料资源丰富、价格便宜、综合强度高等特点,是非常有潜力的碳材料。因此,本文针对半焦的活化及应用开展了研究,主要工作如下:半焦活化的实验研究。研究了昭通褐煤半焦经过如水热加压、氢氧化钾、硝酸、高温等单步活化法后孔隙结构的变化规律,并对比分析了水热加压及氢氧化钾协同活化和分步活化对半焦孔隙结构的影响。最终懫用单步和协同活化组合活化半焦,先进行硝酸活化(浓度40%),然后进行氢氧化钾(浓度10%)和水热加压(温度325℃)协同活化,最终得到比表面积为502.739m2/g的活性半焦,较原料半焦提高103%。活性半焦脱硫脱硝的实验研究。进行了活性半焦脱硫、活性半焦脱硝、活性半焦同时脱硫脱硝的实验研究。首先通过浸渍法对活性半焦进行了金属氧化物如氧化铜、氧化铁的负载,考察其对活性半焦脱硫脱硝性能的影响。进而考察不同实验条件如空速、温度、氧气含量、入口 SO_2、NO的浓度对负载金属氧化物活性半焦脱硫脱硝性能的影响。半焦的表征。利用比表面积BET、扫描电子显微镜SEM、傅立叶变换红外光谱FT-IR等分析手段对昭通半焦活化前后、负载金属氧化物前后、脱硫脱硝前后进行表征,观察分析半焦微观层面的变化。
[Abstract]:The emission of SO_2,NO and other pollutants from coal-fired flue gas has caused many problems closely related to human health, such as photochemical smog and acid rain, which are the main causes of air pollution. Therefore, it is urgent to control and control the emission of flue gas pollutants, and how to carry out desulphurization and denitrification economically and efficiently is a difficult problem in environmental protection in our country. The dry denitrification and desulphurization technology has the advantages of recycling catalyst, no secondary pollution, high purification efficiency, small area and so on. It has become the development trend of flue gas clean technology in the future because of its advantages such as numerous flue gas desulphurization and denitrification technology. Activated carbon is the main catalyst carrier for flue gas dry desulfurization and denitrification, which has the advantages of synergistic removal of flue gas pollutants, small occupation area and low use temperature, but its development is limited by high investment and purification cost. The semi-coke in China is rich in resources and is one of the main products in the multi-cogeneration system of coal pulverized coal furnace pyrolysis. Its clean and efficient utilization needs to be solved. The use of semi-coke in the treatment of pollutants such as desulphurization and denitrification has opened a new way for its rational utilization. Compared with activated carbon, active semi-coke is a potential carbon material because of its rich raw material, cheap price and high comprehensive strength. Therefore, the activation and application of semi-coke are studied in this paper. The main work is as follows: experimental study on activation of semi-coke. The changes of pore structure of Zhaotong lignite semi-coke after single-step activation such as hydrothermal pressure, potassium hydroxide, nitric acid and high temperature were studied. The effects of hydrothermal pressure, co-activation of potassium hydroxide and stepwise activation on pore structure of semi-coke were compared and analyzed. Finally, the semi-coke was activated by one-step and co-activation combination, which was first activated by nitric acid (40%), then by potassium hydroxide (10%) and hydrothermal pressure (325 鈩，
本文编号：2381159
[Abstract]:The emission of SO_2,NO and other pollutants from coal-fired flue gas has caused many problems closely related to human health, such as photochemical smog and acid rain, which are the main causes of air pollution. Therefore, it is urgent to control and control the emission of flue gas pollutants, and how to carry out desulphurization and denitrification economically and efficiently is a difficult problem in environmental protection in our country. The dry denitrification and desulphurization technology has the advantages of recycling catalyst, no secondary pollution, high purification efficiency, small area and so on. It has become the development trend of flue gas clean technology in the future because of its advantages such as numerous flue gas desulphurization and denitrification technology. Activated carbon is the main catalyst carrier for flue gas dry desulfurization and denitrification, which has the advantages of synergistic removal of flue gas pollutants, small occupation area and low use temperature, but its development is limited by high investment and purification cost. The semi-coke in China is rich in resources and is one of the main products in the multi-cogeneration system of coal pulverized coal furnace pyrolysis. Its clean and efficient utilization needs to be solved. The use of semi-coke in the treatment of pollutants such as desulphurization and denitrification has opened a new way for its rational utilization. Compared with activated carbon, active semi-coke is a potential carbon material because of its rich raw material, cheap price and high comprehensive strength. Therefore, the activation and application of semi-coke are studied in this paper. The main work is as follows: experimental study on activation of semi-coke. The changes of pore structure of Zhaotong lignite semi-coke after single-step activation such as hydrothermal pressure, potassium hydroxide, nitric acid and high temperature were studied. The effects of hydrothermal pressure, co-activation of potassium hydroxide and stepwise activation on pore structure of semi-coke were compared and analyzed. Finally, the semi-coke was activated by one-step and co-activation combination, which was first activated by nitric acid (40%), then by potassium hydroxide (10%) and hydrothermal pressure (325 鈩，
本文编号：2381159
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