洁净煤技术

2019, v.25;No.124(06) 126-131

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纳米CaO-Fe(Cp)_2复合催化剂对烟煤燃烧性能的影响
Effect of composite catalyst of nano-scale CaO supported ferrocene on combustion characteristics of bituminous coal

闫小川;张宝军;王调妮;樊喜兵;
YAN Xiaochuan;ZHANG Baojun;WANG Tiaoni;FAN Xibing;Department of Biochemical Engineering,Pingliang Vocational and Technical College;Pingliang Environmental Monitoring Station;

摘要(Abstract):

在煤炭催化领域,无机铁系催化剂易中毒,CaO分散性较差,为了提高催化效率,急需寻求一种新型有机-无机复合燃煤催化剂。采用高温煅烧氧化钙,二氯化碳溶液浸渍的方法制备负载率为85.46%纳米氧化钙负载二茂铁复合催化剂(CaO-Fe(Cp)_2),并对华亭东华镇煤矿烟煤的烧失率、热值释放率、硫释放率、灰分、灰融性等催化性能进行研究。纳米CaO-Fe(Cp)_2复合催化剂在烟煤燃烧过程中的催化性能明显优于单独添加CaO和二茂铁的煤样。500℃燃烧2.5 h时,添加纳米CaO-Fe(Cp)_2复合催化剂煤样烧失率比原煤提高24.95%,比添加1%纳米CaO煤样增加13.20%,比添加1%二茂铁煤样增加6.95%。添加纳米CaO-Fe(Cp)_2复合催化剂煤样的热值释放率比原煤增加27.16%,比添加1%纳米CaO煤样增加9.63%,比添加1%二茂铁煤样增加4.75%。添加纳米CaO-Fe(Cp)_2复合催化剂煤样的硫释放率比原煤降低5.87%,比添加1%纳米CaO煤样增加3.98%,比添加1%二茂铁煤样降低9.92%。添加纳米CaO-Fe(Cp)_2复合催化剂煤样的灰分比原煤降低10.58%,比添加1%纳米CaO煤样降低13.50%,比添加1%二茂铁煤样增加4.28%。研究表明:纳米CaO-Fe(Cp)_2复合催化剂在煤炭中分布均匀,增大了与煤炭分子的接触面积,增加了反应活性,加快燃烧速率,促进硫释放,降低了灰分,在催化初期缓慢释放Fe_2O_3,避免催化剂中毒。二者协同催化作用,具有良好的催化助燃和节能环保作用,是一种新型高效燃煤催化剂。
In the field of coal catalysis,the inorganic iron catalysts are toxic and the dispersion of CaO is poor. In order to improve the catalytic efficiency,it is urgent to find a new organic-inorganic composite coal catalyst. In this study,the load rate of nanometer calcium oxide supported ferrocene composite catalyst(CaO-Fe(Cp)_2) was 85.46%,and(CaO-Fe(Cp)_2) was prepared by calcined calcium oxide at high temperature and impregnated with carbon dichloride solution. The catalytic properties of bituminous coal in Huating donghua town coal mine, such as burning loss rate,heat value release rate,sulfur release rate,ash content and ash melting property were studied.The catalytic performance of nanometer CaO-Fe(Cp)_2 composite catalyst was better than that of CaO and ferrocene alone. When burning at 500 ℃ for 2.5 h,the combustion loss rate of the coal sample with the addition of nanometer CaO-Fe(Cp)_2 composite catalyst is 24.95%higher than that of the raw coal,which is 13.20% higher than that with the addition of 1% nano CaO,and 6.95% higher than that with the addition of 1% ferrocene. The calorific value release rate of the coal sample with nano-cao-Fe(Cp)_2 composite catalyst increases by27.16% compared with that of raw coal,9.63% compared with that of coal with 1% nano CaO and 4.75% compared with that of coal with1% ferrocene. The sulfur release rate of CaO-Fe(Cp)_2 composite catalyst is 5.87% lower than that of raw coal,3.98% higher than that of CaO with 1% nanometer,and 9.92% lower than that of ferrocene with 1%. The ash content of the coal sample with the addition of nanometer CaO-Fe(Cp)_2 composite catalyst is10.58% lower than that of raw coal,13.50% lower than that of coal samples with 1% nano CaO and4.28% higher than that of coal samples with 1% ferrocene. The results show that nanometer CaO-Fe(Cp)_2 composite catalyst is evenly distributed in coal,which increases the contact area with coal molecules,increases the reaction reactivity,accelerates combustion rate,promotes the sulfur release,reduces the ash content,and releases Fe_2O_3 slowly at the initial stage of catalysis to avoid catalyst poisoning. As a new type of high efficiency coal burning catalyst,it has a broad application prospect.

关键词(KeyWords): 烟煤;燃烧;复合催化剂;烧失率;硫释放率;灰分;灰融性
bituminous coal;combustion;composite catalyst;burning loss rate;sulfur release rate;ash content;ash fusibility

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基金项目(Foundation): 2018年度甘肃省高等学校科研项目一般项目(2018A-286)

作者(Author): 闫小川;张宝军;王调妮;樊喜兵;
YAN Xiaochuan;ZHANG Baojun;WANG Tiaoni;FAN Xibing;Department of Biochemical Engineering,Pingliang Vocational and Technical College;Pingliang Environmental Monitoring Station;

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