活性石灰/粉煤灰制备烧结烟气脱硫剂的试验研究
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摘要
本文研究了以钢铁企业常用物料活性石灰和自备电厂粉煤灰制备的脱硫剂，在鞍钢循环流化床脱硫试验装置上进行了烧结烟气脱硫性能试验。首次将活性石灰和粉煤灰组成的脱硫剂引入钢铁企业烧结烟气循环流化床烟气脱硫系统，并取得成功。本研究的目的是，充分利用钢铁企业现有碱性原料和碱性废物，研究开发适合烧结机烟气循环流化床脱硫的新型脱硫剂，达到以废治废和降低运行成本，提高脱硫剂利用率的目的，为我国烧结烟气脱硫的发展提供支持。
本研究烧结烟气SO_2浓度范围在200～500mg／m~3，烟气量4150～5000m~3／h，烟气温度在80～135℃的条件下，对活性石灰和粉煤灰组成的脱硫剂进行了脱硫剂配比试验，脱硫前后脱硫剂粒径分析试验，脱硫剂加水活化、烟气蒸汽增湿脱硫对比试验及钙硫比对脱硫效率影响试验研究。试验结果表明，活性石灰与粉煤灰的质量比按1：2配置时，脱硫剂钙的利用率较高，并具有相对较好的经济性；通过对脱硫前后脱硫剂粒径变化对比分析，循环流化床脱硫过程可导致大颗粒减小，小颗粒增加。在脱硫剂粒径分布分析的基础上，选择出5-350μm为本试验装置较合适的脱硫剂粒径范围。脱硫剂加6％的水活化比不加水活化具有更好的脱硫效果；烟气蒸汽增湿有利于脱硫剂钙的利用率和SO_2累积去除量的提高；优选出的脱硫剂连续性试验表明本试验装置在钙硫比1.5时可以取得70％的脱硫效率。试验及分析结果表明活性石灰与粉煤灰组成的脱硫剂充分利用了钢铁企业现有碱性原料和碱性废物，以废治废，是适合烧结机烟气脱硫的新型脱硫剂。
A research was carried out on the desulfurization reagent made by lime that is common used in steel corporation and pulverized coal ash produced by steel corporation's fossil power plant, and a trial about the capability of the desulfurization reagent on the Ore sintering flue gas was done in the Angang's Circulating fluidized bed absorber tester. In this trial, the desulfurization reagent made by lime and pulverized coal ash was first used in the ore sintering flue gas desulfurization in circulating fluidized bed absorber and made a success. The aim of this study is to make the best used of the alkalescent raw material and alkalescent waste material of the steel corporation. So it help to find a new kind of the desulfurization reagent which can be used in the ore sintering flue gas desulfurization in circulating fluidized bed absorber and reduce the run cost, increase the desulfurization reagent using ratio. The result of the study may give the support to the ore sintering flue gas desulfurization.
The research was done under the condition of 200~500 mg/m3 SO2 inlet concentration, 4150~5000m3/h and 80-135℃ ore sintering flue gas. The desulfurization reagent optimum burden test, the desulfurization reagent particle diameter distributing analysis , activation test by water, and increasing flue gas humidity test by steam were done. The results of test indicated that, when the desulfurization reagent made by lime and pulverized coal ash under the mass proportion of 1:2, the desulfurization reagent Ca using ratio and economy of material were better; The desulfurization reagent particle diameter comparison analysis shows that the process of desulfurization in circulating fluidized bed absorber may cause big particle decrease, and little particle increase. On the basic of the desulfurization reagent particle diameter distributing analysis, it gives the range from 5 to 350 u m of the desulfurization reagent particle diameter which adapt to the tester; and The desulfurization reagent has more desulfurated effec
t by 6% water
activation; and the desulfurization reagent Ca using ratio and SO2 accumulative remove total have been increased by increasing flue gas humidity by steam. The selected desulfurization reagent continuous loop test indicated that in this tester the SO2 removal eflficiency was 70% at 1.5 of Ca/s mole ratio. The test and the results of test indicated that the desulfurization reagent made by lime and pulverized coal ash make the best use of the steel corporation alkalescence raw material and alkalescence waster. So it may be a new kind of the desulfurization reagent which adapt to the ore sintering flue gas desulfurization.
本研究烧结烟气SO_2浓度范围在200～500mg／m~3，烟气量4150～5000m~3／h，烟气温度在80～135℃的条件下，对活性石灰和粉煤灰组成的脱硫剂进行了脱硫剂配比试验，脱硫前后脱硫剂粒径分析试验，脱硫剂加水活化、烟气蒸汽增湿脱硫对比试验及钙硫比对脱硫效率影响试验研究。试验结果表明，活性石灰与粉煤灰的质量比按1：2配置时，脱硫剂钙的利用率较高，并具有相对较好的经济性；通过对脱硫前后脱硫剂粒径变化对比分析，循环流化床脱硫过程可导致大颗粒减小，小颗粒增加。在脱硫剂粒径分布分析的基础上，选择出5-350μm为本试验装置较合适的脱硫剂粒径范围。脱硫剂加6％的水活化比不加水活化具有更好的脱硫效果；烟气蒸汽增湿有利于脱硫剂钙的利用率和SO_2累积去除量的提高；优选出的脱硫剂连续性试验表明本试验装置在钙硫比1.5时可以取得70％的脱硫效率。试验及分析结果表明活性石灰与粉煤灰组成的脱硫剂充分利用了钢铁企业现有碱性原料和碱性废物，以废治废，是适合烧结机烟气脱硫的新型脱硫剂。
A research was carried out on the desulfurization reagent made by lime that is common used in steel corporation and pulverized coal ash produced by steel corporation's fossil power plant, and a trial about the capability of the desulfurization reagent on the Ore sintering flue gas was done in the Angang's Circulating fluidized bed absorber tester. In this trial, the desulfurization reagent made by lime and pulverized coal ash was first used in the ore sintering flue gas desulfurization in circulating fluidized bed absorber and made a success. The aim of this study is to make the best used of the alkalescent raw material and alkalescent waste material of the steel corporation. So it help to find a new kind of the desulfurization reagent which can be used in the ore sintering flue gas desulfurization in circulating fluidized bed absorber and reduce the run cost, increase the desulfurization reagent using ratio. The result of the study may give the support to the ore sintering flue gas desulfurization.
The research was done under the condition of 200~500 mg/m3 SO2 inlet concentration, 4150~5000m3/h and 80-135℃ ore sintering flue gas. The desulfurization reagent optimum burden test, the desulfurization reagent particle diameter distributing analysis , activation test by water, and increasing flue gas humidity test by steam were done. The results of test indicated that, when the desulfurization reagent made by lime and pulverized coal ash under the mass proportion of 1:2, the desulfurization reagent Ca using ratio and economy of material were better; The desulfurization reagent particle diameter comparison analysis shows that the process of desulfurization in circulating fluidized bed absorber may cause big particle decrease, and little particle increase. On the basic of the desulfurization reagent particle diameter distributing analysis, it gives the range from 5 to 350 u m of the desulfurization reagent particle diameter which adapt to the tester; and The desulfurization reagent has more desulfurated effec
t by 6% water
activation; and the desulfurization reagent Ca using ratio and SO2 accumulative remove total have been increased by increasing flue gas humidity by steam. The selected desulfurization reagent continuous loop test indicated that in this tester the SO2 removal eflficiency was 70% at 1.5 of Ca/s mole ratio. The test and the results of test indicated that the desulfurization reagent made by lime and pulverized coal ash make the best use of the steel corporation alkalescence raw material and alkalescence waster. So it may be a new kind of the desulfurization reagent which adapt to the ore sintering flue gas desulfurization.
引文
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5 Graf R. First operation experience with a dry flue gas desulfurization process using a circulating fluidized bed (FGD-CFB), Lecture at he "First intemational conference on circulating fluidized beds" in Halifax Nova Scotia, Canada in November 1985
6 Graf, R., Riley, J. D.: Dry/semi dry flue gas desulfurization using the LURGI circulating fluid bed absorption process. Lecture at the EPA/EPRI fourth symposium on flue gas desulphurization in Atlanta, Georgia from 18th to21th November, 1986
7 马果骏．烟气循环流化床脱硫技术简介．电力环境保护．10(1)：46-48．1994．
8 R. E. Gra, 1000 hours commercial operating experience with advanced design reflux circulating fluid bed scrubbing employing slaked lime reagent. EPRI/EPA/DOE SO_2 control symposium, march 28-31, 1995, Miami, Florida, USA.
9 Rgraf. 70000 hours of commercial operating experience with advanced-design, reflux circulating fluid bed flue gas desulfufization[A]. Proceedings Air & Waste Management association's 90th Annual Meeting & exhibition[C]. Toronto, Ontario, Canada, June 8-13, 1997.
10 黎在时，刘卫平．德国WULFF公司的干法脱硫技术．中国环保产业CEPI．：2：74-76．2002
11 米浩林，马果骏．回流式烟气循环流化床脱硫技术．热力发电．2：57-59．1998．
12 薛建明，马果骏．欧洲三种烟气循环流化床脱硫技术及经济分析．中国环保产业 CEPI．1：36-38．2003
13 徐贤忠．高效回流式循环流化床烟气脱硫及除尘技术．国际电力．6(2)：60-63．2002
14 张凤兰，程岩．小龙潭发电厂烟气循环流化床脱硫工程评述．电力环境保护．19(1)：22-24．2003
15 吴必科，李云峰，曹宇飞．内回流循环流化床烟气脱硫运行特性分析．中国电力．36(8)：55-58．2003
16 刘颖昊．循环流化床烧结烟气脱硫半工业性试验研究[硕士学位论文]．西安建筑科技大学，1999．
17 谢建军，钟秦．循环流化床烟气脱硫实验研究．南京理工大学学报．25(6)．2002
18 赵旭东，吴少华，等．循环流化床烟气悬浮脱硫技术中试及机理分析．环境科学．23(2)：109-112．2002
19 樊保国，等．循环流化床烟气脱硫机理研究．环境科学．19(3)：14-17．1998
20 黄震，等．首套国产循环流化床烟气脱硫装置投入运行，建筑热能通风空调，(1)，56～58．2001
21 赵旭东，等．75t／h锅炉双循环流化床烟气脱硫装置研制及应用，中国电力，35(3)：62-65．2002
22 葛介龙，王新龙．NID脱硫工艺在国内的应用研究．电力环境保护．18(1)：10-12．2002
23 徐迅宇．广州市锅炉烟气脱硫环境费用效益的分析．污染防治技术．16(2)：76-78．2003
24 国家环境保护总局．2002年中国环境状况公报．
25 UNEP(1987) Environmental Aspects of Iron and Steel production An Overview.
26 刘培善．日本五大钢铁公司企业概况．冶金工业部安全环保公司、冶金部建筑研究院编．1988．9．
27 贝加·尼汉宁·坚生，彼得·波·奥生．采用FLS式气悬吸收剂半干法吸收装置的高效脱硫技术．国际电力环境保护学术研讨会论文集．1996．10．
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