
华北电力大学能源动力与机械工程学院,北京市 昌平区 102206
[ "张宏伟(1997),男,硕士研究生,主要研究方向为脱硫废弃物中重金属脱除/固化研究,1766455532@qq.com;" ]
[ "张永生(1975),男,博士,教授,主要研究方向为燃料与污染物控制,本文通信作者,yszhang@ncepu.edu.cn;" ]
[ "汪涛(1987),男,博士,副教授,主要研究方向为燃料污染物生成机理及控制技术,wtao@ncepu.edu.cn;" ]
[ "王家伟(1987),男,博士,高级工程师,主要研究方向为燃料与污染物控制,wangjiawei750@163.com。" ]
收稿日期:2023-04-12,
修回日期:2023-08-09,
纸质出版日期:2024-06-30
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张宏伟,张永生,汪涛等.电厂燃煤飞灰固化脱硫污泥重金属铅特性研究[J].发电技术,2024,45(03):527-534.
ZHANG Hongwei,ZHANG Yongsheng,WANG Tao,et al.Study on the Characteristics of Heavy Metal Lead in Desulfurization Sludge Solidified by Coal-Fired Fly Ash in Power Plant[J].Power Generation Technology,2024,45(03):527-534.
张宏伟,张永生,汪涛等.电厂燃煤飞灰固化脱硫污泥重金属铅特性研究[J].发电技术,2024,45(03):527-534. DOI: 10.12096/j.2096-4528.pgt.23043.
ZHANG Hongwei,ZHANG Yongsheng,WANG Tao,et al.Study on the Characteristics of Heavy Metal Lead in Desulfurization Sludge Solidified by Coal-Fired Fly Ash in Power Plant[J].Power Generation Technology,2024,45(03):527-534. DOI: 10.12096/j.2096-4528.pgt.23043.
目的
2
燃煤电厂脱硫污泥中重金属富集显著,降低脱硫污泥中重金属含量十分必要。
方法
2
提出利用电厂飞灰固化脱硫污泥重金属的思路,并和常见固化剂开展对比。
结果
2
以铅为对象,在水泥、飞灰、螯合剂二硫代氨基甲酸酯(dithiocarbamate,DTC)和螯合剂三聚硫氰酸三钠盐(TMT-15)中,飞灰对脱硫污泥中铅固化效果最好;不同飞灰及脱硫污泥固化效率在40%~100%。机理分析表明,类似于水泥,飞灰化学成分主要含有SiO
2
、Al
2
O
3
、CaO、Fe
2
O
3
等,可与脱硫污泥发生水化反应等,生成对重金属固化稳定有利的水化硅酸钙C-S-H等水化产物及钙矾石等物质,同时生成物对重金属铅等具有吸附作用。
结论
2
在燃煤电厂脱硫污泥中掺入一定比例的飞灰可以实现铅的固化稳定,为脱硫污泥从危险固废降低为一般固废提供了方法。
Objectives
2
The enrichment of heavy metals in desulphurization sludge of coal-fired power plant is significant
so it is necessary to reduce the content of heavy metals in desulfurization sludge.
Methods
2
This paper put forward the idea of solidifying heavy metals in desulfurization sludge with fly ash from power plants and compared with common curing agents.
Results
2
Among cement
fly ash
chelating agent DTC (dithiocarbamate) and chelating agent TMT-15 (trisodium thiocyanate)
fly ash has the best solidification effect on lead in desulfurization sludge. The solidification efficiency of different fly ash and desulfurization sludge is between 40% and 100%. The mechanism analysis shows that
similar to cement
the chemical composition of fly ash mainly contains SiO
2
Al
2
O
3
CaO and Fe
2
O
3
etc.
which can react with desulfurization sludge to generate hydration products such as hydrated calcium silicate C-S-H and ettringite
etc. It is beneficial to the solidification of heavy metals. The products can adsorb heavy metals such as lead.
Conclusions
2
It can be seen that adding a certain proportion of fly ash into the desulfurization sludge of coal-fired power plants can realize the solidification and stability of lead
which provides a method for reducing the desulfurization sludge from dangerous solid waste to general solid waste.
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