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中国环境报:南京精准治理储罐VOCs排放

  • 2026-02-02 20:38:26
中国环境报:南京精准治理储罐VOCs排放

2025年,江苏省南京市PM2.5浓度降至27.1微克/立方米,优良天数比率达到87.4%,包括臭氧在内的空气质量6项指标首次全面达到国家二级标准。这份“蓝天成绩单”背后,不只是推进汽车尾气、锅炉燃烧烟气排放等治理,还包含了一场关于“呼吸”的较量——伫立在化工园区内数以千计的涉VOCs储罐的治理。

破题
给2606个储罐建立“数字户籍”

作为华东地区重要的石化产业基地,南京市129家企业共有涉挥发性有机物(VOCs)储罐2606个,各类涉VOCs储罐物料年周转量高达2.3亿吨。随着温度变化和物料周转,这些储罐内的液面升降改变了气相压力,肉眼看不见的VOCs便随着储罐的“呼吸”逸散到大气环境中。

这成为南京市大气治理中一块难啃的“硬骨头”——2606个涉VOCs储罐,一度贡献了全市30%的VOCs排放量。而VOCs又是生成臭氧和PM2.5的重要前体物,治好储罐、管好VOCs关系着空气质量是否持续改善,更关乎群众呼吸的每一口空气。

治理之难,首先在于底数不清。由于储罐数量庞大、介质复杂、密封方式各异,面对这些庞然大物,“靠人盯、靠腿跑”的传统监管模式显得力不从心。“以前检查储罐,往往只能看个外观,里面到底什么样,浮盘情况如何,很难实时掌握。”南京市生态环境局相关负责人坦言。

破局,始于精准摸排。2023年5月,南京市发布《关于进一步加强我市挥发性有机液体储罐排放管理有关措施的通知》(以下简称“储罐十条”)。它将源头控制、组件管理、泄漏检测等10个方面的任务条分缕析,为储罐排放治理立下了“规矩”。以此为契机,一场针对全市2606个涉VOCs储罐的“大体检”全面铺开。

依托大气综合调度系统,全市构建起储罐信息管理库。每一个储罐都拥有了自己的“数字户籍”——储罐类型、物料种类、浮盘结构、密封等级、废气治理设施等详细信息被一一录入。数据连点成线、织线成网,扫清了监管盲区。这种清单化、信息化的管理模式,为后续的“靶向治疗”打下了坚实基础。

在摸清底数的基础上,南京市生态环境部门并未采取“一刀切”的管理模式,而是评估减排空间,形成问题清单,推行“一罐一策”。同时,指导企业科学谋划治理项目,针对周转量大、物料真实蒸气压高、涉异味物质的重点储罐,分时、分类、分批次开展整治。

攻坚
毫厘之间的“呼吸”较量

摸清底数后,南京市对储罐治理的颗粒度精细到了毫厘之间。一场“源头减排”的技术浪潮在南京市石化行业涌现。

呼吸阀,被形象地称为储罐的“鼻子”。当罐内压力因气温升高或进料而升高时,它呼出气体以防憋压;当压力降低时,它吸入空气以防瘪罐。

“传统的呼吸阀气密性较差,往往在‘呼吸’之间,VOCs气体便趁机逃逸。”中国扬子石油化工有限公司(以下简称扬子石化)相关技术负责人介绍,“别小看这一个小小的阀门,它不仅关乎环保,更关乎着企业的‘钱袋子’。”为了解决这一问题,扬子石化综合考量介质特性、区域环境敏感度及物料周转频率,制定了详细的更新迭代计划,最终引进了先进的低泄漏呼吸阀。

这不仅是设备的更换,更是标准的重塑。数据对比是惊人的:以常见的200mm—400mm口径呼吸阀为例,传统呼吸阀的泄漏量约为0.4立方米/小时。而低泄漏呼吸阀,其泄漏量仅为0.003立方米/小时,从“0.4”到“0.003”,数值下降了两个数量级。这一数据的变化,意味着扬子石化VOCs无组织排放量的显著降低,更标志着企业成功从源头上明显减少了物料挥发损耗。

治理VOCs,不仅要靠“堵”住源头出口,也要靠“锁”住源头。中国石化集团金陵石油化工有限责任公司(以下简称金陵石化),针对在用储罐实施了“全接液高效浮盘+弹性大补偿高效密封”改造。

传统的内浮顶储罐,其浮盘与液面之间往往存在微小的气相空间。这个空间就像一个“蒸笼”,让油气不断挥发。“全接液高效浮盘就像一张保鲜膜,紧紧贴在液面上,有效消除了油气挥发的空间。”金陵石化技术人员形象地比喻道。配合弹性大补偿高效密封技术,浮盘边缘的泄漏损失也被降至最低。而在末端,废气经过“低温柴油吸收+三级冷凝+活性炭吸附”的预处理后,进入RTO或CO装置深度焚烧,排放浓度远低于国家标准。

治理VOCs,不仅要靠硬件升级,也要靠工艺优化。金陵石化将治理触角延伸至工艺源头,一套自主开发的“直热供料监控系统”让上下游装置实现了无缝衔接,直供料比例超过80%。这意味着,在正常生产时,有10余台中间储罐可以“休眠”,从源头上切断了VOCs的产生,实现了“不治而治”。

算账
挥发是污染,留下是效益

曾经,环保投入被不少企业

视为单纯的“成本项”

但在南京市的储罐排放治理实践中

企业却算出了不一样的账

随着“储罐十条”的深入实施,南京市已完成450个储罐的全接液浮盘改造或末端治理提升,累计更换低泄漏呼吸阀及紧急泄压阀1900个,重点储罐实现了“高效治理”。据测算,储罐排放深度治理带动南京全市实现VOCs减排7400吨/年,堵住了“跑冒滴漏”,切实减少了物料的逸散损耗。每年可为企业节约物料成本超5000万元

“以前觉得环保投入是在烧钱,现在发现其实是在省钱。”这是许多企业负责人的心声。“储罐里的物料,挥发了就是污染,留下了就是效益。”这句话如今已成为南京石化企业的共识。

“经济账”算得明白,环境改善的“生态账”更是令人振奋。在储罐分布密集的江北新材料科技园,VOCs监测浓度从2023年的6.9ppb直线下降至2025年的1.8ppb,降幅高达74%。在全省43个化工园区的排名中,园区从倒数第6位,一跃升至第10位,打了一场漂亮的翻身仗。“十四五”以来,南京市臭氧污染下降态势明显,2025年臭氧超标天数同比减少6天,臭氧指标实现“十四五”以来最好水平。

同时,在推进储罐治理的过程中,南京市政府部门并没有止步于传统的“发文件、开罚单”,而是转变角色,架起了政企互动的“连心桥”。

“企业有难处,我们来帮扶;技术有瓶颈,我们请专家。”南京市生态环境局大气处负责人介绍,通过组织专家授课,解读政策、厘清技术路线,开展现场观摩,让先进经验看得见、学得会,帮助企业解决“想治不会治”的难题。

更重要的是,政府拿出了真金白银的支持。截至目前,12家企业16个项目获得中央和市级大气资金补助共1.4亿元。这上亿元的资金注入,进一步助企纾困,让企业在绿色转型的道路上走得更快、更稳。

从源头摸排的“精准化”

到技术改造的“高端化”

再到工艺流程的“绿色化”

南京市通过深耕储罐VOCs深度治理

形成减污、降本、增效的多赢局面

🍃☁️🌍

为南京市的高质量发展

注入了强劲“绿色动能”

也让“蓝天白云”成为了

南京市最普惠的民生福祉

来源:南京生态环境

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  1. CONNECT:[ UseTime:0.000390s ] mysql:host=127.0.0.1;port=3306;dbname=b460;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000828s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000300s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000265s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000517s ]
  6. SELECT * FROM `set` [ RunTime:0.000186s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000549s ]
  8. SELECT * FROM `article` WHERE `id` = 473783 LIMIT 1 [ RunTime:0.000385s ]
  9. UPDATE `article` SET `lasttime` = 1770469774 WHERE `id` = 473783 [ RunTime:0.012551s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000223s ]
  11. SELECT * FROM `article` WHERE `id` < 473783 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000500s ]
  12. SELECT * FROM `article` WHERE `id` > 473783 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000461s ]
  13. SELECT * FROM `article` WHERE `id` < 473783 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.005849s ]
  14. SELECT * FROM `article` WHERE `id` < 473783 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001883s ]
  15. SELECT * FROM `article` WHERE `id` < 473783 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.020350s ]
0.112058s