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脱硝催化剂失活及再生实验

第46卷 第11期 热 力 发 电 V ol.46 No.11

收稿日期:2017-03-12

基金项目:中国华能集团公司总部科技项目(HNJK14-H01)

Supported by :Science and Technology Project of China Huaneng Group (HNJK14-H01)

第一作者简介:王丽朋(1983—),男,硕士,工程师,主要研究方向为SCR 脱硝催化剂及其再生技术,wlp408@https://www.doczj.com/doc/dd3794667.html, 。

脱硝催化剂失活及再生实验

王丽朋,陈宝康,姚 燕,杨晓宁,孔凡海

(西安热工研究院有限公司苏州分公司,江苏 苏州 215153)

[摘 要]以某电厂失活和再生催化剂为研究对象,采用全尺寸催化剂性能检测台和比表面积仪、X

射线荧光光谱仪、X 射线衍射光谱仪、扫描电镜等仪器对催化剂进行了性能检测和表征分

析。结果表明:2层催化剂经过24 000 h 脱硝运行后,不能满足脱硝效率≥83.0%且氨逃逸

量≤3 μL/L 的设计要求,催化剂相对活性为0.70;经再生处理后,催化剂孔道得到了疏通,

各项指标恢复到新催化剂的水平,2层催化剂满足设计脱硝效率和氨逃逸量要求的同时,

有效控制了SO 2/SO 3转化率;再生后催化剂相对活性提高到0.99,脱硝性能得到明显改善。

[关 键 词]脱硝催化剂;失活;再生;脱硝效率;氨逃逸;活性;SO 2/SO 3转化率

[中图分类号]X115 [文献标识码]A [文章编号]1002-3364(2017)11-0067-06

[DOI 编 号]10.3969/j.issn.1002-3364.2017.11.067

Experimental study on deactivation and regeneration performance of

denitration catalysts

WANG Lipeng, CHEN Baokang, YAO Yan, YANG Xiaoning, KONG Fanhai

(Suzhou Branch of Xi’an Thermal Power Research Institute Co., Ltd., Suzhou 215153, China)

Abstract: Taking the deactivated and regenerated denitration catalysts used in a power plant as the research objects, the full-size catalyst performance test bench and several instruments such as XRF, BET, SEM and XRD were employed to carry out performance test and characterization analysis for the catalysts. The results show that, after 24 000 hours’ operation, two layers of the catalysts could not satisfy the design requirements that the de-NO x efficiency should be higher than 83% and the ammonia escape rate be below 3 μL/L. The relative activity value of the deactivated catalyst was 0.70. After regeneration, the catalyst pores were cleared and the performance indexes of the regenerated catalyst returned to a level of new catalyst. The de-NO x efficiency and ammonia escape rate of the two layers of catalysts met the performance requirements. The SO 2/SO 3 conversion rate was well controlled. The relative activity value of the regenerated catalyst increased to 0.99 and the denitration performance was significantly improved.

Key words: denitration catalyst, deactivation, regeneration, denitration efficiency, ammonia escape, activity, SO 2/SO 3 conversion rate

燃煤电厂NO x 的脱除普遍采用选择性催化还

原(SCR )技术,而脱硝催化剂是SCR 脱硝装置的

核心部分。在流场与混合情况较好时,脱硝系统的

各项性能可否达标主要取决于催化剂[1-2]。催化剂化

学寿命通常为16 000~24 000 h ,在化学寿命期满后

需要补装催化剂或对失活催化剂进行更换或再生

处理,以保证脱硝装置正常运行。

国内外运行经验表明,催化剂再生技术可使失活催化剂恢复到原有活性90%以上,甚至达到或优于新鲜催化剂的水平。催化剂再生的成本是更换新催化剂成本的40%~60%,可有效降低脱硝系统运营费用,且不必考虑更换新催化剂时对废催化剂的无害化处理。同时,大力发展催化剂再生技术,符合国家产业政策,满足资源再生利用的要求,具有良好的社会和经济效益。本文结合再生工程实际应用,以失活和再生催化剂为研究对象,采用全尺寸万方数据

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