无机污染物对火电厂脱硫塔浆液起泡效应研究
发布时间：2018-07-17 02:10
【摘要】：我国火力发电厂常采用的是石灰石-石膏湿法脱硫技术,但在实际的运营生产中,常常出现吸收塔浆液起泡溢流的状况,若不能妥善解决浆液起泡溢流问题,将会导致脱硫效率降低、石膏品质下降,这严重影响了脱硫系统的稳定运行。本文以马鞍山当涂火力发电厂为研究对象,采集了石灰石原料、飞灰、吸收塔浆液、工艺水、石灰石浆液,研究探讨了无机离子的含量以及无机离子与重金属之间的相关性,得出以下结论:1.经实验验证,筛选出Ca2+、Mg2+、Cl-、SO42-做为主要的无机指标,以消泡剂的添加量来表征浆液起泡的程度,通过实验分析可以得出,Ca2+、Mg2+、Cl-、SO42-均会对浆液起泡具有贡献度,Mg2+与SO42-反应将会生成泡沫;Ca2+与Mg+具有同离子增长效应,Cl-与Ca2+反应生成的CaCl2溶于液体中将会对浆液的表面张力产生一定影响。浆液中其他无机离子之间反应将会生成络合物薄膜,Mg2+对络合膜的形成具有促进作用,这将抑制石灰石的溶解性,从而影响了脱硫的效率。2.石灰石浆液和工艺水中的各种成分大部分符合标准,若工艺水水质出现异常,其Ca2+、Mg2+及重金属元素含量亦会出现异常,可以得出Ca2+、Mg2及重金属元素出现异常均会对浆液起泡具有一定的贡献度。3.对浆液中的无机离子指标与理化指标做相关性分析可以得出,pH与Ca2+、Mg2+呈显著正相关,吸收塔浆液中实测pH值高于理论设计值,因此要以不影响实际运行生产为前提,适量的减少石灰石浆液的供浆量。对浆液中的无机离子指标与重金属元素做相关性分析可得,Cl-与As呈极显著正相关关系,SO42-与Ni也呈极显著正相关关系,说明随着Cl-及SO42-的增加,As和Ni的含量均会增加。无机离子Ca2+、Mg2+、Cl-及重金属As、Ni的累积富集将会对吸收塔浆液起泡产生协同效应。4.对浆液中的无机离子指标、重金属指标与表面张力做相关性分析,Ca2+及Cl-与表面张力呈显著负相关关系,重金属Cd、Cr、As与浆液的表面张力也呈显著负相关,因浆液的表面张力越小,浆液就越容易起泡,因此随着吸收塔浆液中Ca2+、Cl-及重金属Cd、Cr、As的增多,浆液的表面张力会降低,从而浆液就容易起泡。
[Abstract]:Limestone-gypsum wet desulphurization technology is often used in thermal power plants in our country. However, in actual operation and production, the bubbling overflow of slurry in absorption tower is often found, if the problem of bubbling overflow of slurry can not be solved properly, It will lead to the decrease of desulfurization efficiency and the quality of gypsum, which seriously affects the stable operation of the desulfurization system. In this paper, the limestone raw materials, fly ash, absorber slurry, process water and limestone slurry were collected from Dangtu Thermal Power Plant in Ma'anshan. The content of inorganic ions and the correlation between inorganic ions and heavy metals were studied. Draw the following conclusion: 1. The results showed that Ca ~ (2 +) mg _ (2) Cl-so _ (4) _ (2-) was selected as the main inorganic index, and the amount of defoamer was used to characterize the degree of slurry foaming. Through the experimental analysis, it can be concluded that both Ca ~ (2 +) mg _ (2) and so _ (4) _ 4 ~ (2-) contribute to the bubbling of slurry. Mg _ (2) and so _ (4) _ (2-) react with mg to form a foam. [Ca ~ (2 +)] and mg _ (2) react with Ca ~ (2 +) to form CaCl _ (2) dissolved on the surface of the slurry. Tension has a certain effect. The reaction between other inorganic ions in the slurry will result in the formation of complex film Mg2, which will inhibit the solubility of limestone and affect the efficiency of desulphurization. Most of the components of limestone slurry and process water meet the standard. If the quality of process water is abnormal, the contents of Ca 2 + mg 2 and heavy metal elements will also be abnormal. It can be concluded that abnormal Ca 2 + mg 2 and heavy metal elements will contribute to the bubbling of slurry. By analyzing the correlation between inorganic ion index and physicochemical index, it can be concluded that pH and Ca 2 + mg 2 are significantly positive correlation, and the measured pH value in the slurry of absorber is higher than the theoretical design value, so it is necessary to do not affect the actual operation and production. Reduce the amount of limestone slurry. By analyzing the correlation between inorganic ion index and heavy metal elements in the slurry, it was found that there was a very significant positive correlation between Cl- and as, so _ 42- and Ni, which indicated that the contents of as and Ni would increase with the increase of Cl- and so _ 42-. The accumulation and enrichment of inorganic ion Ca2 + Mg2 + and heavy metal As-Ni will produce synergistic effect on the bubbling of absorber slurry. Correlation Analysis between heavy Metal Indexes and Surface tension for Inorganic Ion Indexes in slurry; Ca 2 + and Cl-have a significant negative correlation with surface tension, and there is also a significant negative correlation between heavy metal CD _ (2) Cr ~ (2 +) _ as and surface tension of slurry, because the surface tension of size is smaller. Therefore, with the increase of Ca ~ (2 +) ~ (2 +) and CD _ (2 +) Cr ~ (2 +) as in the slurry of the absorber, the surface tension of the slurry will decrease, and the size will be easily foamed.
【学位授予单位】：安徽理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：X773
本文编号：2128558
[Abstract]:Limestone-gypsum wet desulphurization technology is often used in thermal power plants in our country. However, in actual operation and production, the bubbling overflow of slurry in absorption tower is often found, if the problem of bubbling overflow of slurry can not be solved properly, It will lead to the decrease of desulfurization efficiency and the quality of gypsum, which seriously affects the stable operation of the desulfurization system. In this paper, the limestone raw materials, fly ash, absorber slurry, process water and limestone slurry were collected from Dangtu Thermal Power Plant in Ma'anshan. The content of inorganic ions and the correlation between inorganic ions and heavy metals were studied. Draw the following conclusion: 1. The results showed that Ca ~ (2 +) mg _ (2) Cl-so _ (4) _ (2-) was selected as the main inorganic index, and the amount of defoamer was used to characterize the degree of slurry foaming. Through the experimental analysis, it can be concluded that both Ca ~ (2 +) mg _ (2) and so _ (4) _ 4 ~ (2-) contribute to the bubbling of slurry. Mg _ (2) and so _ (4) _ (2-) react with mg to form a foam. [Ca ~ (2 +)] and mg _ (2) react with Ca ~ (2 +) to form CaCl _ (2) dissolved on the surface of the slurry. Tension has a certain effect. The reaction between other inorganic ions in the slurry will result in the formation of complex film Mg2, which will inhibit the solubility of limestone and affect the efficiency of desulphurization. Most of the components of limestone slurry and process water meet the standard. If the quality of process water is abnormal, the contents of Ca 2 + mg 2 and heavy metal elements will also be abnormal. It can be concluded that abnormal Ca 2 + mg 2 and heavy metal elements will contribute to the bubbling of slurry. By analyzing the correlation between inorganic ion index and physicochemical index, it can be concluded that pH and Ca 2 + mg 2 are significantly positive correlation, and the measured pH value in the slurry of absorber is higher than the theoretical design value, so it is necessary to do not affect the actual operation and production. Reduce the amount of limestone slurry. By analyzing the correlation between inorganic ion index and heavy metal elements in the slurry, it was found that there was a very significant positive correlation between Cl- and as, so _ 42- and Ni, which indicated that the contents of as and Ni would increase with the increase of Cl- and so _ 42-. The accumulation and enrichment of inorganic ion Ca2 + Mg2 + and heavy metal As-Ni will produce synergistic effect on the bubbling of absorber slurry. Correlation Analysis between heavy Metal Indexes and Surface tension for Inorganic Ion Indexes in slurry; Ca 2 + and Cl-have a significant negative correlation with surface tension, and there is also a significant negative correlation between heavy metal CD _ (2) Cr ~ (2 +) _ as and surface tension of slurry, because the surface tension of size is smaller. Therefore, with the increase of Ca ~ (2 +) ~ (2 +) and CD _ (2 +) Cr ~ (2 +) as in the slurry of the absorber, the surface tension of the slurry will decrease, and the size will be easily foamed.
【学位授予单位】：安徽理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：X773
【相似文献】
相关期刊论文 前10条
1 王国微;许建斌;李晓彬;;吸收塔浆液溢流原因分析及处理措施[J];河北电力技术;2011年06期
2 顾圣秋;俞利强;;石灰石-石膏湿法脱硫中吸收塔浆液泡沫过多问题探讨[J];上海电气技术;2010年04期
3 况延良;;脱硫吸收塔浆液品质恶化原因分析[J];东北电力技术;2013年08期
4 毕德刚;;吸收塔浆液密度测量方式及安装位置的优化[J];科技视界;2012年30期
5 邹向群;;吸收塔浆液起泡原因分析及消泡剂的选择[J];电力科技与环保;2012年04期
6 金东春;吴广生;朱昶;;湿法脱硫吸收塔浆液成分影响因素研究[J];浙江电力;2007年01期
7 程永新;;FGD系统中吸收塔浆液起泡溢流的原因分析及解决办法[J];电力科技与环保;2011年01期
8 武泉;韩成志;王强;;脱硫吸收塔浆液失效的原因与处理措施[J];节能与环保;2011年10期
9 潘维加;谢又成;周玲;严俊峰;;吸收塔浆液pH值控制系统的分析与改进[J];电站系统工程;2006年06期
10 武泉;韩成志;王强;;脱硫吸收塔浆液失效的原因分析与处理措施[J];同煤科技;2011年03期
相关会议论文 前1条
1 刘炜;;吸收塔浆液浓度对脱硫系统安全、经济运行的影响[A];全国火电大机组（600MW级）竞赛第十二届年会论文集（下册）[C];2008年
相关硕士学位论文 前4条
1 汤启栋;基于多变量的火力发电厂烟气脱硫PH值智能检测方法研究[D];西南石油大学;2015年
2 王瑶瑶;有机污染物对石灰石-石膏法脱硫塔浆液起泡影响研究[D];安徽理工大学;2017年
3 李军良;脱硫吸收塔浆液理化性质与起泡相关性研究[D];安徽理工大学;2017年
4 刘璐;无机污染物对火电厂脱硫塔浆液起泡效应研究[D];安徽理工大学;2017年
，本文编号：2128558
本文链接：https://www.wllwen.com/shengtaihuanjingbaohulunwen/2128558.html
