密封点挥发性有机物（VOCs）排放速率的数值模拟及实测应用

doi:10.16085/j.issn.1000-6613.2019-1661

摘要/Abstract

摘要：

目前对设备与管线组件密封点挥发性有机物（VOCs）排放速率的研究尚停留经验估算的阶段，本文以连接件密封点为典型代表，对乙醇生产装置中所涉密封点VOCs排放速率进行数值模拟和实测应用研究。利用直接测量包扎法对连接件进行包扎密封，将其所形成的包袋内流通空间类比为石油化工反应器，引入化工单元混合时间和空时的概念，通过计算流体力学数值模拟的方法，对比包袋内速度场、浓度场和压力场的分布情况，定量分析出包扎法系统中惰性载气吹扫流量和包袋体积之间的关系，优选合理的操作参数，现场实测并推算出连接件VOCs排放速率。研究结果表明：适当减小包袋体积可增加混合强度，缩短混合时间；在保持袋内微正压条件下，合理选择吹扫流量以匹配不同的包袋体积，吹扫时间大于袋内混合空时的2倍可基本达到近稳态；建立新的连接件密封点VOCs泄漏浓度和泄漏排放速率之间的幂函数关系式，用以评估核算VOCs年排放量更准确。

关键词: 挥发性有机物, 泄漏检测与修复, 排放速率, 数值模拟, 混合时间

Abstract:

At present, the research on the emission rate of volatile organic compounds (VOCs) at the sealing points of equipment and pipeline components is still at the stage of empirical estimation. Taking the sealing points of connectors as a typical representative to carry out numerical simulation and practical application research on the emission rate of VOCs at the sealing points involved in ethanol production equipment. The direct measurement binding method was used to bind and seal the connecting piece. The circulation space in the bag formed by the binding method was analogized to a petrochemical reactor. The concepts of mixing time and space-time in the chemical unit were introduced. The distribution of velocity field, concentration field and pressure field in the bag were compared by the method of computational fluid dynamics numerical simulation. The relationship between inert carrier gas sweep flow rate and bag volume in the binding method system was quantitatively analyzed. The reasonable operating parameters were optimized, and the VOCs emission rate of the connecting piece was measured and calculated on site. The results showed that the mixing intensity can be increased and the mixing time can be shortened by appropriately reducing the volume of bags. Under the condition of keeping the micro positive pressure in the bag, the purging flow rate was reasonably selected to match the volume of different bags, and the purging time was more than 2 times of the mixing empty time in the bag, which can basically reach a near-steady state. A new power function relation between VOCs leakage concentration and leakage emission rate at the sealing point of the connector was established to evaluate and calculate VOCs annual emission more accurately.

Key words: volatile organic compounds, leakage detection and reparation, leak rate, numerical simulation, mixing time

中图分类号:

X701

闵健, 腾东玉, 王云, 陈达. 密封点挥发性有机物（VOCs）排放速率的数值模拟及实测应用[J]. 化工进展, 2020, 39(7): 2599-2605.

Jian MIN, Dongyu TENG, Yun WANG, Da CHEN. Numerical simulation and practical application of VOCs emission rate at sealing point[J]. Chemical Industry and Engineering Progress, 2020, 39(7): 2599-2605.

参考文献

1	鲁君, 李莉, 林立, 等. 挥发性有机物气体泄漏检测与修复技术[J]. 化工环保, 2011, 31(4): 323-326.
1	LU Jun, LI Li, LIN Li, et al. Leakage detection and reparation technology for gas containing volatile organic compounds[J]. Environmental Protection of Chemical Industry, 2011, 31(4): 323-326.
2	周学双. 石化化工企业挥发性有机物污染源排放及估算方法研究与实践[M]. 北京: 中国环境出版社, 2015: 25.
2	ZHOU Xueshuang. Research and practice on emission and estimation methods of volatile organic compounds pollution sources in petrochemical enterprises[M]. Beijing: China Environment Publishing Group, 2015: 25.
3	刘志阳, 廖程浩, 张晖, 等. 泄漏检测与修复(LDAR)检测数据准确性评估方法研究[J]. 环境科学与管理, 2017, 42(9): 39-42.
3	LIU Zhiyang, LIAO Chenghao, ZHANG Hui, et al. Method of evaluating data accuracy of leak detection and repair(LDAR) test[J]. Environmental Science and Management, 2017, 42(9): 39-42.
4	彭茵, 吉晟, 赵子玮, 等. 泄漏检测与修复技术管理系统研究及评估建议[J]. 现代化工, 2017, 37(10): 10-14.
4	PENG Yin, JI Sheng, ZHAO Ziwei, et al. Research and evaluation recommendation on management system of leak detection and repair technology[J]. Modern Chemical Industry, 2017, 37(10):10-14.
5	张时佳, 彭茵, 陈璐, 等. 炼油行业泄漏检测与修复技术实践研究[J]. 环境科学与管理, 2016, 41(3): 41-44.
5	ZHANG Shijia, PENG Yin, CHEN Lu, et al. Practice on leak detection and repair of refinery industry[J]. Environmental Science and Management, 2016, 41(3): 41-44.
6	高洁, 张春林, 王伯光, 等. 基于包扎法的石化乙烯装置挥发性有机物排放特征[J]. 中国环境科学, 2016, 36(3):694-701.
6	GAO Jie, ZHANG Chunlin, WANG Boguan, et al. Emission characteristics of volatile organic compounds emitted from an ethylene process unit in petrochemical industry based on blow-through method[J]. China Environmental Science, 2016, 36(3): 694-701.
7	海南省环境科学研究院, 中国石油大学(华东, 中国石油化工股份有限公司抚顺石油化工研究院, 等. 石化工业排污许可证申请与核发技术规范: HJ 853—2017[S]. 北京: 中国标准出版社, 2017.
7	Hainan Academy of Environmental Sciences, China University of Petroleum(East China), SINOPEC DalianFushun) Research Institute of Petroleum and Petrochemicals, et al. Technical specification for application and issuance of pollutant permit Petrochemical Industry: HJ 853—2017[S]. Beijing: Standards Press of China, 2017.
8	高少华, 邹兵, 崔积山, 等. 基于氢火焰离子检测仪响应因子的设备泄漏排放核算[J]. 化工环保, 2017, 37(6): 707-712.
8	GAO Shaohua, ZOU Bing, CUI Jishan, et al. Emissions accounting of VOCs from equipment leakage based on response factors of FID[J]. Environmental Protection of Chemical Industry, 2017, 37(6): 707-712.
9	胡永飞, 张海滨, 孔祥军, 等. 基于拍照法编码LDAR技术在石化行业VOCs排放控制中的应用[J]. 安全与环境工程, 2016, 23(6): 95-99.
9	HU Yongfei, ZHANG Haibin, KONG Xiangjun, et al. Application of LDAR technology on VOCs emission control in petrochemical enterprises on the basis of photographic technique[J]. Safety and Environmental Engineering, 2016, 23(6): 95-99.
10	贾瑜玲, 牛皓, 段潍超, 等. 精对苯二甲酸生产企业挥发性有机物泄漏检测与排放估算[J]. 化工环保, 2017, 37(5): 598-602.
10	JIA Yuling, NIU Hao, DUAN Weichao, et al. VOCs leakage detection and emission estimation in a PTA plant[J]. Environmental Protection of Chemical Industry, 2017, 37(5): 598-602.
11	United State Environmental Protection Agency. Protocol for equipment leak emission estimates: EPA-435/R-95-017[S]. Washington D C , EPA, 1995.
12	张庆华, 毛在砂, 杨超, 等. 一种计算搅拌槽混合时间的新方法[J]. 化工学报, 2007, 58(8): 1891-1896.
12	ZHANG Qinghua, MAO Zaisha, YANG Chao, et al. A new method for determining mixing time in stirred tanks[J]. Journal of Chemical Industry and Engineering (China), 2007, 58(8): 1891-1896.
13	张国娟, 闵健, 高正明, 等. 涡轮桨搅拌槽内混合过程的数值模拟[J]. 北京化工大学学报, 2004, 31(6): 24-27.
13	ZHANG Guojuan, MIN Jian, GAO Zhengming, et al. Numerical simulation of mixing process in a stirred tank with rushton turbine[J]. Journal of Beijing University of Chemical Technology, 2004, 31(6): 24-27.
14	抚顺石油化工研究院, 中国环境科学研究院. 石油化学工业污染物排放标准: GB 31571—2015[S]. 北京: 中国标准出版社, 2015.
14	Fushun Research Institute of Petroleum and Petrochemicals, Chinese Research Academy of Environmental Sciences. Emission standard of pollutants for petroleum chemistry industry: GB 31571—2015[S]. Beijing: Standards Press of China, 2015.
15	朱亮, 高少华, 丁德武, 等. LDAR技术在化工装置泄漏损失评估中的应用[J]. 工业安全与环保, 2014, 40(8): 31-34.
15	ZHU Liang, GAO Shaohua, DING Dewu, et al. Application of LDAR technology in chemical plant leakage loss evaluation[J]. Industrial Safety and Environmental Protection, 2014, 40(8): 31-34.
16	上海市环境监测中心, 同济大学, 中国环境监测总站. 泄漏和敞开液面排放的挥发性有机物检测技术导则: HJ733—2014[S]. 北京: 中国标准出版社, 2014.
16	Shanghai Environmental Monitoring Center, Tongji University, China National Environmental Monitoring Centre. Guideline for the determination of volatile organic compound leaks and uncovered liquid surface emissions: HJ 733—2014[S]. Beijing: Standards Press of China, 2014.

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