CN114405240B - 一种利用煤气化渣制备脱硝材料的方法 - Google Patents
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Abstract
一种利用煤气化渣制备脱硝材料的方法属于化工废弃物处理技术领域。煤气化渣颗粒置于研磨装置中,研磨至过200目筛的细度,获得煤气化渣粉末;煤气化渣粉末与浓度为3~4mol/L的氢氧化钾溶液以3:5~6的质量之比混合,混合充分后,静置浸渍3h,将搅拌后的混合液烘干。本发明以煤气化渣制备的脱硝材料在氧气含量为1%时,在高温区脱硝率可维持75%以上,脱硝率最高可达90%以上。
Description
技术领域
本发明属于化工废弃物处理技术领域、环境保护领域,具体涉及煤气化渣处理和再利用,用于水泥窑炉的烟气处理。
背景技术
我国能源结构目前来说还是以煤为主要能源,应用煤气化技术之后,虽然可以制备可燃气体,但是会产生大量的煤气化渣。煤气化渣的资源化处理、利用是一直困扰着化工行业的重要问题,目前以填埋或者堆放为主要处理方式,不但占用了土地而且会导致土壤污染、水源污染等一系列的生态环境问题,并造成资源的浪费。研究合适的煤气化渣处理方法,实现废渣的资源再利用,变废为宝,将其充分有效的应用于工业中,对环境保护和煤化工业的可持续发展有重要意义。
不少学者在氧化物对NOx排放的影响进行研究,将废渣或金属氧化物作为添加剂与煤粉混合,从源头降低NOx的生成。煤气化渣是煤与氧气或富氧空气发生不完全燃烧生成CO与H2的过程中,煤中无机矿物质经过不同的物理化学转变伴随着煤中残留的碳颗粒形成的固态残渣。其化学组成主要包括SiO2、Al2O3、CaO、Fe2O3等。目前有研究利用煤气化渣进行氮氧化物脱除,但是效果不好。通过对其进行不同方式的改性处理,可以破坏表面致密的玻璃体,从而打开内部通道,使脱硝活性得到激发。
碱改性是在一定温度下利用碱性腐蚀性物质与无机硅铝质材料进行反应,在表面原位形成孔道结构,达到提升材料吸附性。
本发明旨在以煤气化渣为原料,粉磨、碱溶、恒温浸渍等为改性手段,研制出一种用于水泥预热器的无机脱硝材料。原料包括:煤气化渣,氢氧化钾粉末,去离子水;设备:研磨器,离心机,烘干机等。本发明具有以下优点:研磨降低了煤气化渣的粒度,增加煤气化渣比表面积,利于煤气化渣与氮氧化物的充分接触;进一步碱溶将表面含有的Al和Si等物质反应形成新结构,增加催化活性,同时暴露大量孔道,增加比表面积,利于煤气化渣与氮氧化物的充分接触;另外还会暴露活性基团位点,以及增加碱金属离子的负载,多方面达到提升煤气化渣的载体及活化性质的目的。此方法能够充分利用煤气化渣,真正实现废物再利用。
发明内容
一种以煤气化渣为原料制备用于水泥预热器中的脱硝材料的方法,其特征在于,以下步骤:
1.煤气化渣颗粒的研磨处理,将煤气化渣颗粒置于研磨装置中,研磨3~6次至过200目筛的细度,获得煤气化渣粉末
2.煤气化渣粉末以3:5~3:6的比例(质量之比)加入浓度为3~4mol/L的氢氧化钾溶液中,混合充分后,静置浸渍3h,将搅拌后的混合液烘干。
3.将制备的脱硝材料置于脱硝测试装置中测试其脱硝效率,催化剂用量为0.5g,烟气组成为ω(NO)=1000ppm,ω(O2)=1%,N2为平衡气,气体流速为450mL/min,在室温25℃升温至800℃和900℃,测试不同温度点出口烟气的成分及含量,计算脱硝率随温度的变化,从而表征出脱硝材料的脱硝性能。本发明以煤气化渣制备的脱硝材料在氧气含量为1%时,在高温区脱硝率可维持75%以上,脱硝率最高可达90%以上。
具体实施方式
KOH改性煤气化渣成分(%)
SiO2 | Al2O3 | CaO | Fe2O3 | K2O | Na2O | MgO | |
KOH | 50.41 | 14.3084 | 9.9644 | 9.4243 | 9.8428 | 1.7472 | 1.919 |
下面结合实施例对本发明作进一步说明,但本发明并不限于以下实施例。
实施例1
将煤气化渣颗粒置于研磨装置中,研磨至过200目筛的细度,获得煤气化渣粉末。煤气化渣粉末以3:5.8的比例(渣与碱溶液质量之比)加入浓度为3mol/L的氢氧化钾溶液中,混合充分后,静置浸渍3h,将搅拌后的混合液烘干,制得脱硝材料。制备的脱硝材料置于脱硝测试装置中测试其脱硝效率,催化剂用量为0.5g,在烟气成分为1000ppmNO,ω(O2)=1%,N2为平衡气,气体流速为450mL/min时,脱硝效率基本随温度升高逐渐增大,当温度到达800℃时,脱硝率可达到77.8%。
实施例2
将煤气化渣颗粒置于研磨装置中,研磨至过200目筛的细度,获得煤气化渣粉末。煤气化渣粉末以3:6.1的比例(渣与碱溶液质量之比)加入浓度为4mol/L的氢氧化钾溶液中,混合充分后,静置浸渍3h,将搅拌后的混合液烘干,制得脱硝材料。制备的脱硝材料置于脱硝测试装置中测试其脱硝效率,催化剂用量为0.5g,在烟气成分为1000ppmNO,ω(O2)=1%,N2为平衡气,气体流速为450mL/min时,脱硝效率基本随温度升高逐渐增大,当温度到达800℃时,脱硝率可达到75.0%。
实施例3
将煤气化渣颗粒置于研磨装置中,研磨至过200目筛的细度,获得煤气化渣粉末。煤气化渣粉末以3:5.8的比例(渣与碱溶液质量之比)加入浓度为3mol/L的氢氧化钾溶液中,混合充分后,静置浸渍3h,将搅拌后的混合液烘干,制得脱硝材料。制备的脱硝材料置于脱硝测试装置中测试其脱硝效率,催化剂用量为0.5g,在烟气成分为1000ppmNO,ω(O2)=1%,N2为平衡气,气体流速为450mL/min时,脱硝效率基本随温度升高逐渐增大,当温度到达900℃时,脱硝率可达到74.0%。
实施例4
将煤气化渣颗粒置于研磨装置中,研磨至过200目筛的细度,获得煤气化渣粉末。煤气化渣粉末以3:6.1的比例(渣与碱溶液质量之比)加入浓度为4mol/L的氢氧化钾溶液中,混合充分后,静置浸渍3h,将搅拌后的混合液烘干,制得脱硝材料。制备的脱硝材料置于脱硝测试装置中测试其脱硝效率,催化剂用量为0.5g,在烟气成分为1000ppmNO,ω(O2)=1%,N2为平衡气,气体流速为450mL/min时,脱硝效率基本随温度升高逐渐增大,当温度到达900℃时,脱硝率为96.0%。
Claims (1)
1.一种基于以煤气化渣为原料制备用于水泥预热器中的脱硝材料的应用,其特征在于,所述以煤气化渣为原料制备用于水泥预热器中的脱硝材料的制备方法包括以下步骤:
1).煤气化渣颗粒的研磨处理:将煤气化渣颗粒置于研磨装置中,研磨至过200目筛的细度,获得煤气化渣粉末;
2).煤气化渣粉末与浓度为3~4mol/L的氢氧化钾溶液以3:5~6的质量之比混合,混合充分后,静置浸渍3h,将搅拌后的混合液烘干;
应用具体为:置于脱硝测试装置中测试其脱硝效率,催化剂用量为0.5g,烟气组成为ω( NO ) =1000ppm,ω(O2)=1%,N2为平衡气,气体流速为450mL/min,在室温25℃升温至800℃~900℃,测试不同温度点出口烟气的成分及含量。
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