无极紫外灯光解氧化去除恶臭气体中硫化氢的研究
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硕士学位论文
无极紫外灯光解氧化去除恶臭 气体中硫化氢的研究
STUDY ON PHOTOLYSIS OF HYDROGEN SULFIDE FROM MALODOROUS GAS USING ELECTRODELESS UV LAMP
汪剑锋
哈尔滨工业大学 2010年12月
国内图书分类号：X512 学校代码：10213 国际图书分类号：504 密级：公开
工学硕士学位论文
无极紫外灯光解氧化去除恶臭 气体中硫化氢的研究
硕士研究生：汪剑锋 导师：李朝林 教授 申请学位：工学硕士 学科：环境科学与工程 所在单位：深圳研究生院 答辩日期：2010年12月 授予学位单位：哈尔滨工业大学
Classified Index: X512
U.D.C: 504
Thesis for the Master Degree in Engineering STUDY ON PHOTOLYSIS OF HYDROGEN SULFIDE FROM MALODOROUS GAS USING ELECTRODELESS UV LAMP
Candidate: Wang Jianfeng Supervisor: Prof. Li Chaolin Academic Degree Applied for: Master of Engineering Specialty: Environmental Science and Engineering Affiliation: Shenzhen Graduate School Date of Defense: December, 2010 Degree-Conferring-Institution:Harbin Institute of Technology 哈尔滨工业大学工学硕士学位论文
I 摘 要 随着经济的发展和社会的进步，一方面越来越多的恶臭污染源出现在生活环境中，另一方面人们对生活质量的追求也在不断提高，恶臭污染已引起世界范围的广泛关注。硫化氢气体来源广、嗅阈值低、浓度较高时会对人体健康产生严重危害，是恶臭气体中最为典型的恶臭物质。紫外光解氧化法是一种非常有发展前景的除臭技术。高频无极紫外灯作为一种新型紫外光源，具有节能高效、辐射强度高、使用寿命长等诸多优点。本文采用自主研制的高频无极紫外灯光解氧化去除恶臭气体中的硫化氢，并进一步探索了去除恶臭气体中甲硫醇气体的能力。主要研究结果如下： （1）在无极紫外灯性能的研究中发现，无极紫外灯能产生大量的臭氧，湿度为65%的室内空气以300L/min的流量通气时，泡状灯和柱形灯的臭氧产率分别为1.25g/h、0.33g/h。实验结果表明，减少通气流量或是增加空气湿度，无极紫外灯的臭氧产率都会不同程度地下降。 （2）对不同工艺去除硫化氢的研究结果表明：当停留时间为5.8s，硫化氢初始浓度为3.1～24.6mg/m3时，泡状灯的光解氧化作用、单独紫外光解作用、单独臭氧氧化作用三种工艺的硫化氢平均去除率分别为96.6%、31.5%、13.3%。无极紫外灯光解氧化去除硫化氢的效率比另外两种工艺去除率的总和高38.7～65.0%，这说明紫外辐射与臭氧对硫化氢的去除存在着协同作用。 （3）从反应器出来的臭氧浓度为50～70ppm，硫化氢浓度为1.6～15.8mg/m3
的尾气在Fe2O3催化作用下，能将残留的硫化氢气体彻底去除，臭氧自身也能彻底分解。 （4）利用小试装置去除污泥脱除水散发的恶臭气体中的硫化氢，气体流量为500L/min（停留时间t=2.6s），硫化氢浓度为0.8～8.2mg/m3时，硫化氢去除率为70～
90%，比去除单一硫化氢气体的效率低10%左右。采用此装置处理污泥脱除水混合恶臭气体中的浓度为0.1～2.5mg/m3甲硫醇气体，通气流量为500L/min时，甲硫醇的去除率也能达到90%以上。 高频无极紫外灯除臭装置对恶臭气体中的硫化氢和甲硫醇气体均有很好的去除效果，将促进紫外除臭技术的推广应用。
关键词：无极灯；硫化氢；除臭；光解氧化 哈尔滨工业大学工学硕士学位论文 II Abstract With the development of economy and society, on one hand more and more odor sources appear in the community, on the other hand, the pursuit of high quality of life is growing among people, odor pollution has caused widespread concern. With low odor threshold and is harmful to health when at higher concentration, hydrogen sulfide gas is one of the most important part of the malodorous substances, furthermore, the source of hydrogen sulfide have a broad distribution. Photolysis and oxide process with UV lamp is regarded as a promising technology to control gaseous pollutants. As a new type of UV source, there are many advantages of High Frequency Electrodeless Lamp (HFEL) when compared with traditional UV lamp, such as high efficient, high radiation intensity and long length of life. In this study, we investigated the efficiency of removal of H2S with self-design HFEL, and then explored the removal efficiency of methanethiol in the malodorous gases with HFEL .The main results as follows: (1)In the study of characteristics of HFEL, we found that HFEL could produce a large mass of ozone, with air humidity 65% and gas flow 300L/min, the zone yield of bubble and column HFEL were 1.25g/h, 0.33g/h. The results showed that reduced gas flow or increased air humidity, the yield of ozone would decline to varying degrees. (2) Comparison between three different technique were investigated, The results showed that: when the residence time was 5.8s, and the initial concentration of hydrogen sulfide was 3.1~24.6mg/m3, the average removal efficiency of hydrogen sulfide by UV light photolysis and oxidation, UV photolysis alone and O3 oxidation alone were 96.6%, 31.5%, 13.3%. The removal efficiency of UV/O3 was about 38.7～65.0% higher than the sum of effect by using each of them alone. So the study proves that there are synergistic effects between UV radiation and O3.
(3) Off-gas came out of the reactor with ozone concentration from 50 to 70 ppm and
H2S concentration from 1.6 to 15.8 mg/m3, after passed through the Fe2O3 Catalytic system, the residual H2S gas and ozone were completely removed. (4) In the study of small pilot experiments we found that the malodorous gas from removal water of sludge, with H2S concentration from 0.8 to 8.2 mg/m3 and methanethiol concentration from 0.1 to 2.5mg/m3. The mixed odors after passed through the small pilot plant, with flow rate 500L/min (residence time 2.5s), the removal efficiency of H2S was
