无机盐工业
主管:中海油天津化工研究设计院有限公司
主办:中海油天津化工研究设计院有限公司
   中海油炼油化工科学研究院(北京)有限公司
   中国化工学会无机酸碱盐专业委员会
ISSN 1006-4990 CN 12-1069/TQ

无机盐工业 ›› 2023, Vol. 55 ›› Issue (4): 38-44.doi: 10.19964/j.issn.1006-4990.2022-0467

• 研究与开发 • 上一篇    下一篇

新型低碳排放脱硫剂纳米氢氧化钙的制备、评价及应用研究

姚勇1(), 黎石竹1, 郑东晨2, 曾庭华3, 吴志超1, 于驰1, 刘法谦2()   

  1. 1.广东能源集团科学技术研究院有限公司,广东 广州 510630
    2.中山大学化学工程与技术学院,广东 珠海 519082
    3.南方电网电力科技股份有限公司,广东 广州 510180
  • 收稿日期:2022-08-06 出版日期:2023-04-10 发布日期:2023-04-13
  • 通讯作者: 刘法谦(1978— ),男,博士,教授,研究方向为气体吸附;E-mail:liufq7@mail.sysu.edu.cn
  • 作者简介:姚勇(1981— ),男,硕士,高级工程师,研究方向为能源电力技术;E-mail:yaoyong@geg.com.cn
  • 基金资助:
    国家自然科学基金面上项目(52073311)

Study on preparation,evaluation and application of new low-carbon emission nano calcium hydroxide desulfurizer

YAO Yong1(), LI Shizhu1, ZHENG Dongchen2, ZENG Tinghua3, WU Zhichao1, YU Chi1, LIU Faqian2()   

  1. 1. Guangdong Energy Group Science and Technology Research Institute Co. ,Ltd. ,Guangzhou 510630,China
    2. School of Chemical Engineering and Technology,Sun Yat-sen University,Zhuhai 519082,China
    3. China Southern Power Grid Power Technology Co. ,Ltd. ,Guangzhou 510180,China
  • Received:2022-08-06 Published:2023-04-10 Online:2023-04-13

摘要:

传统石灰石-石膏湿法烟气脱硫(FGD)过程中,石灰石和二氧化硫反应会生成大量的二氧化碳,不利于中国“碳达峰”与“碳中和”目标的实现。通过利用廉价的起始原料,在聚乙烯亚胺(PEI)存在的情况下,制备了一系列具有纳米尺度的氢氧化钙,并采用SEM、XRD、BET、FT-IR 等方法对样品进行了表征,用以替代传统石灰石。在模拟FGD实验装置下,研究了不同比表面积氢氧化钙和电厂用石灰石对二氧化硫吸收速率以及脱硫效率的影响,结果显示:在入口二氧化硫质量浓度为3 500 mg/Nm3时,脱硫效率由石灰石的93.05%提升到了氢氧化钙的99.31%。利用韶关电厂1号机组(600 MW)湿法脱硫装置,研究了制备的新型纳米氢氧化钙脱硫剂的实际脱硫效果。结果发现,传统石灰石在使用高硫煤时,无法达到超低排放的要求,而加入部分氢氧化钙(质量分数为18.0%~22.5%)后,均可实现超低排放(出口二氧化硫质量浓度<35 mg/Nm3),脱硫效率均高于99%,从而提高了FGD系统的高硫煤适应性。

关键词: 纳米氢氧化钙, 电厂脱硫, 聚乙烯亚胺, 比表面积

Abstract:

In the traditional limestone-gypsum wet flue gas desulfurization(FGD) process,the reaction of limestone and SO2 generate a large amount of CO2,which is not favorable to the realization of “carbon peaking” and “carbon neutralization”.By using cheap starting materials and in the presence of polyethyleneimine(PEI),a series of nanoscale Ca(OH)2 were prepared to replace traditional limestone for FGD process.The samples were characterized by SEM,XRD,BET,and FT-IR.The effects of Ca(OH)2 with different specific surface area and limestone on SO2 adsorption rate and desulfurization efficiency were studied in a simulated experimental device.The results showed that when the inlet SO2 concentration was 3 500 mg/Nm3,the desulfurization efficiency was increased from 93.05% of limestone to 99.31% of Ca(OH)2.The actual desulfurization effect of the new nano Ca(OH)2 desulfurizer was studied by using the wet desulfurization device of Shaoguan Power Plant Unit 1(600 MW).The results showed that the limestone could not meet the requirements of ultra-low emission by using high sulfur coal,but after adding part of Ca(OH)2(18.0%~22.5%),the ultra-low emission could be achieved(the outlet SO2 concentration was less than 35 mg/Nm3),and the desulfurization efficiency was all higher than 99%,thus improving the adaptability of FGD system to high sulfur coal.

Key words: nano calcium hydroxide, power plant desulfurization, polyethyleneimine, specific surface area

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