为什么炼厂清扫是工艺安全问题，而不是保洁问题

Why refinery cleaning is a process-safety issue, not a housekeeping issue

炼油厂、油品终端与石化装置产生的是混合粉尘：催化剂、焦粉（coke handling）、保温材料以及机加工与制造作业的碎屑同时存在。叠加受限空间与工艺危害后，粉尘控制不能停留在「扫干净」层面，必须做到稳健、可审计、并与现场作业许可体系兼容。这三个词是关键判据：稳健意味着控制措施在整班次内都成立而不是刚开工时成立；可审计意味着能拿出监测与许可记录；与许可体系兼容意味着清扫方案必须写进 permit-to-work 和隔离、接地程序里，而不是并行于它。现实里出问题的顺序几乎总是相同：先是用了错误的清扫方式（干扫、压缩空气吹扫），再是设备不匹配区域危险等级，最后是在热作业窗口里叠加了清扫作业。危险环境里，传统清扫方式因静电、火花或高温而引发事故的路径是明确的，这也是防爆真空技术在石化、矿业、制药、粮食加工等场景成为核心方案的原因。

Refineries, terminals, and petrochemical plants generate mixed dust: catalysts, coke fines, insulation material, and machining/manufacturing debris all coexist. Combined with confined spaces and process hazards, dust control cannot stop at the level of 'just sweep it clean'. It must be robust, auditable, and compatible with the site permit-to-work system. Three words are the key criteria: robust means the control holds for the whole shift, not just at startup; auditable means you can produce monitoring and permit records; compatible with permitting means the cleaning plan is written into the permit-to-work and isolation/grounding procedures, not run parallel to them. In practice the failure sequence is almost always identical: wrong cleaning method first (dry sweeping, compressed-air blowing), then equipment mismatched to the area hazard rating, and finally cleaning stacked on top of a hot-work window. In hazardous environments, the path by which conventional cleaning (dry sweep, air blow) triggers incidents through static, sparks, or heat is well established, which is why explosion-proof vacuum technology is a core solution across petrochemical, mining, pharmaceutical, and grain handling.

NFPA 326-2025：储罐与容器进入、清洗、维修的完整链路

NFPA 326-2025: the full chain for tank and container entry, cleaning, repair

NFPA 326《Standard for the Safeguarding of Tanks and Containers for Entry, Cleaning, or Repair》适用于曾盛装或正盛装易燃、可燃液体及其他危险物质的常压储罐或容器的安全进入、清洗与维修，明确了从准备工作到最终认证的完整流程，目的是防止火灾、爆炸与健康危害。2025 版的主要变化是更新定义与引用文献，与 OSHA 等最新法规保持一致，整体框架与 2020 版一致。三个术语决定了现场怎么做。受限空间：足够大且构型允许人员进入，但进出受限且非设计为连续占用的空间——判定为受限空间即必须进行气体检测并办理许可。合格人员（qualified person）：凭学位、证书、专业资格及经验证明能处理相关工作问题的人，负责签发许可证、指定控制措施。热作业：可能成为点火源的工作，如焊接、切割、打磨。落到清扫承包商身上有个常被忽视的推论——进入储罐做清洗本身就是许可作业，清洁班组必须纳入许可、气体检测、锁闭挂牌与消防看护体系，不能按「外包保洁」流程管理。

NFPA 326, Standard for the Safeguarding of Tanks and Containers for Entry, Cleaning, or Repair, applies to the safe entry, cleaning, and repair of atmospheric tanks and containers that have held or hold flammable/combustible liquids and other hazardous substances. It defines the complete flow from preparation to final certification, to prevent fire, explosion, and health hazards. The main change in the 2025 edition is updated definitions and references, aligned with the latest OSHA regulations; the overall framework is consistent with the 2020 edition. Three terms drive how the work is done. Confined space: large enough and configured to allow entry, but with restricted access and not designed for continuous occupancy, once classified as a confined space, gas testing and a permit are mandatory. Qualified person: someone who by degree, certificate, professional qualification, and experience is proven able to handle the relevant work problems, and who issues the permit and designates controls. Hot work: work that may become an ignition source, such as welding, cutting, and grinding. A frequently overlooked corollary for cleaning contractors: entering a tank to clean it is itself permitted work, the cleaning crew must be folded into the permit, gas-testing, lockout/tagout, and fire-watch system, not managed as outsourced janitorial work.

热作业与惰化的量化红线：10% LFL、LFL 0%、氧 <8%

Quantified red lines for hot work and inerting: 10% LFL, LFL 0%, O2 below 8%

这一段的数字必须原样执行，不能凭经验放宽。热作业条件：可燃气体浓度低于 10% LFL（爆炸下限）时方可进行；标准摘要资料显示，超过 10% LFL 应立即停止作业，而焊接前须再次确认 LFL 为 0% 才启动。惰化要求：氧含量低于 8%，或低于燃烧所需最低氧的 50%。检测仪器必须定期校准，所有参与人员必须培训。进入侧的量化判据来自中国石化行业通行的进塔入罐「八必须」：必须申请办证并经批准，安全措施逐项落实、不得随意变动；必须安全隔绝，将设备上所有与外界连通的管道插入盲板或拆除一段管节；必须切断动力电源并使用防爆型安全灯（12V，绝缘良好、灯具捆扎牢固），取下保险熔丝并挂「有人检修，请勿启动」标识；必须置换通风，清洗置换需同时达到冲洗水溶液呈中性、且无超规定浓度的易燃易爆气体两个条件，并注意清理设备内沉积物（沉积物会继续蒸发分解，须用蒸汽或热水吹扫清理合格）；必须按时间要求做安全分析，进入设备前 30 分钟取样分析有毒有害气体与氧含量，氧含量应为 18%–22% 才允许进入，作业时间较长时每 2 小时分析 1 次，发现超标立即停止作业、撤出人员；必须穿戴规定防护用具，缺氧有毒环境用自吸或机械送风长管防毒面具或氧气呼吸器，腐蚀性介质环境穿戴耐腐蚀全身防护。相关引用标准包括 OSHA 1910.146（受限空间）、API RP 2016、GBZ 1、GB 8958。

These numbers must be applied verbatim, never relaxed by experience. Hot-work conditions: flammable gas concentration must be below 10% LFL (lower flammable limit) before proceeding; summaries state that above 10% LFL work must stop immediately, and before welding LFL must be reconfirmed at 0%. Inerting: oxygen below 8%, or below 50% of the minimum oxygen required to burn. Detection instruments must be calibrated regularly and all personnel trained. The entry-side quantitative criteria follow the widely used refinery 'eight musts' for tank/vessel entry: must apply for and obtain an approved permit with safety measures implemented one by one and not arbitrarily changed; must isolate safely by blanking all pipes connecting the equipment to the outside or removing a pipe section; must cut power and use an explosion-proof safety lamp (12V, well insulated, securely fastened), remove fuse links and hang a 'Personnel working, do not start' sign; must purge and ventilate, with cleaning/purging meeting both neutral wash-water and absence of excess flammable gas, and clearing deposits (deposits keep evaporating/decomposing and must be steam- or hot-water-blown clean); must perform safety analysis on schedule, sample toxic/harmful gases and oxygen 30 minutes before entry, oxygen 18%-22% to permit entry, re-test every 2 hours for long jobs, stop and evacuate on exceeding limits; must wear prescribed PPE, in oxygen-deficient or toxic environments use supplied-air or powered long-tube respirators or oxygen breathing apparatus, in corrosive environments wear full corrosion-resistant protection. Related references: OSHA 1910.146 (confined space), API RP 2016, GBZ 1, GB 8958.

源头控制：催化剂转运与保温拆除的正确打法

Source control: the right way to handle catalyst transfer and insulation removal

混合粉尘的最优解永远是不让它扬起来。催化剂处理与容器进入作业期间，应使用带罩壳的输送设备或手套袋（glove-bag）技术，并在转运点近处设置局部排风（LEV）。切割与打磨作业指定随机（on-tool）吸尘，在电气安全允许的前提下考虑湿法。保温材料拆除要做区域围挡并在工具端捕集；如历史材料信息提示可能含石棉，应立即停止并上报升级处理——这条不能「边做边看」，因为石棉的法定处置路径与普通粉尘完全不同。区域控制层面，喷砂、焦粉处理或耐火材料作业应使用负压围挡，风机风量要按维持定向气流流入作业区来选型，排风经高效过滤后排出；预期存在细催化剂粉尘时，过滤等级取 H13/H14。在可能形成爆炸性粉尘环境的区域，设备必须按区域危险等级评估选型，并遵守现场隔离与接地程序。这里有个成本判断：负压围挡与 LEV 的投入通常远低于一次因清扫扬尘造成的装置停车或作业许可被吊销的代价，且它是唯一能同时降低职业暴露与点火风险的措施。

The optimal solution for mixed dust is always to never let it become airborne. During catalyst handling and vessel entry, use enclosed transfer equipment or glove-bag technology, with local exhaust ventilation (LEV) near the transfer point. For cutting and grinding, specify on-tool extraction, and consider wet methods where electrical safety permits. Insulation removal needs area containment and tool-end capture; if historical material data suggests asbestos, stop immediately and escalate, this cannot be done 'as you go', because the statutory disposal path for asbestos is entirely different from ordinary dust. At the area-control level, abrasive blasting, coke-fines handling, or refractory work should use negative-pressure containment, with fan capacity sized to maintain a directional airflow into the work zone, exhausted through high-efficiency filtration; where fine catalyst dust is expected, use H13/H14 filtration. In areas that may form an explosive dust atmosphere, equipment must be selected by area hazard rating and follow site isolation and grounding procedures. A cost note: negative-pressure containment and LEV usually cost far less than a single unit shutdown or permit revocation caused by cleaning dust release, and they are the only measure that simultaneously lowers occupational exposure and ignition risk.

房务纪律：只用吸尘、禁止钢平台与电缆桥架干扫

Housekeeping discipline: vacuum only, no dry sweeping on steel decks or cable trays

炼厂房务的可执行规则可以压缩成四条。第一，采用「仅吸尘」清洁模式并配备适当过滤，避免在钢平台（steel decks）与电缆桥架（cable trays）上干扫——这两个位置是积尘与二次扬尘的高发点，干扫等于把粉尘从难以清理的角落搬到全场空气里。第二，废料在源头装袋并贴标，防止装置（unit）之间交叉污染；不同装置的催化剂、含硫物料、含铅或含石棉物料混装会让后续处置无法合规。第三，滤芯与密封保持良好状态——旁通泄漏或滤芯积尘会使捕集效率急剧下降，这一点在防爆机型上尤其致命，因为过滤失效同时意味着粉尘外泄与静电积累。第四，用颗粒物监测仪验证控制措施在整个班次内持续有效，并把 COSHH 评估写得简洁可查：这是什么粉尘、如何捕集、性能如何验证。硅的处理另有量化红线：耐火材料等作业存在结晶二氧化硅时，英国 HSE 规定呼吸性结晶二氧化硅（RCS）的工作场所暴露限值为 0.1 mg/m³，必须先做工程控制达标，再谈依赖呼吸防护（RPE），顺序不能颠倒。

The executable rules for refinery housekeeping compress to four. First, adopt a 'vacuum only' cleaning mode with appropriate filtration, and avoid dry sweeping on steel decks and cable trays, these two locations are hotspots for accumulation and secondary dust lift, and dry sweeping just moves dust from hard-to-clean corners into the whole-air volume. Second, bag and label waste at source to prevent cross-contamination between units; mixing catalysts, sulfur-bearing, lead-bearing, or asbestos-bearing material from different units makes later disposal non-compliant. Third, keep filters and seals in good condition, bypass leakage or loaded filters cause capture efficiency to drop sharply, and on explosion-proof units this is especially critical because filter failure means both dust escape and static accumulation. Fourth, verify controls stay effective across the whole shift with a particulate monitor, and keep the COSHH assessment concise and checkable: what dust, how captured, how performance is verified. Crystalline silica has its own red line: where refractory work produces respirable crystalline silica (RCS), the UK HSE workplace exposure limit is 0.1 mg/m3, and engineering controls must be achieved before relying on respiratory protective equipment (RPE), the order cannot be reversed.

防爆吸尘设备怎么选：Ex d / Ex i / Ex p 与气动无电机方案

How to select explosion-proof vacuum equipment: Ex d / Ex i / Ex p and pneumatic motor-free options

防爆真空技术的三条设计路线各有适用场景。隔爆外壳（Ex d）采用高强度合金或工程塑料，内部发生爆炸时通过缝隙冷却火焰，防止引燃外部环境。本安型电路（Ex i）限制电路能量，确保即使短路也不会产生足以引爆的火花（行业通行的量级是电压不超过 30V、电流不超过 100mA）。正压保护（Ex p）向设备内部持续充入惰性气体（如氮气）抑制可燃物浓度。材料与结构侧，防爆设备行业通行做法包括：抗静电滤材表面电阻不超过 10⁸ Ω，避免粉尘摩擦积累电荷；无火花叶轮采用铜铝合金或导电工程塑料，转速控制在安全阈值内（通常低于 12,000 rpm）；多重泄爆阀在过压时定向释放压力，泄爆面积不小于设备容积的 1/10。石化场景的典型要求是 ATEX 认证（Zone 1/21）、防爆等级 Ex IIB T4、真空度不低于 25 kPa、过滤效率 99.97%@0.3 μm，用于炼油厂反应釜残留物（如苯类、硫化氢环境）清理。风险最高的位置优选气动真空系统——无电机、无需电力，配套旋风分离加 HEPA 过滤；这类方案在粮食加工等最小点火能量极低（部分粉尘低至 5 mJ）的场景也是首选。防爆认证费用通常占设备总成本 30% 以上，这是选型时必须提前计入的预算项，不要用普通机型加装滤芯来「等效替代」。

Three design routes for explosion-proof vacuum technology fit different scenarios. Flameproof enclosure (Ex d) uses high-strength alloy or engineering plastic; an internal explosion is cooled by gaps that prevent igniting the external atmosphere. Intrinsic safety (Ex i) limits circuit energy so that even a short circuit cannot produce a spark capable of igniting (industry-common levels: voltage under 30V, current under 100mA). Pressurized protection (Ex p) continuously feeds inert gas (e.g. nitrogen) into the equipment to suppress combustible concentration. On materials and structure, common industry practice includes: antistatic filter media with surface resistance not exceeding 10^8 ohm to avoid charge buildup from dust friction; spark-free impellers of copper-aluminum alloy or conductive engineering plastic, with rotation kept within a safe threshold (typically below 12,000 rpm); multiple explosion-relief valves that directional-release pressure on overpressure, with relief area not less than 1/10 of equipment volume. Typical petrochemical requirements are ATEX certification (Zone 1/21), protection level Ex IIB T4, vacuum not below 25 kPa, filtration efficiency 99.97% at 0.3 micrometer, for cleaning reactor residues (e.g. benzene, hydrogen sulfide environments). The highest-risk locations favor pneumatic vacuum systems, no motor, no electricity, with cyclone separation plus HEPA filtration; these are also the first choice where minimum ignition energy is extremely low (some dust as low as 5 mJ), such as grain handling. Explosion-proof certification typically costs over 30% of total equipment cost, a budget item to include up front, not 'equivalently substituted' by adding a filter to a standard unit.

接地、软管与作业许可：细节决定是否真的防爆

Grounding, hoses, and work permits: details decide whether it is truly explosion-proof

防爆吸尘设备的失效多数不在主机，而在附件与流程。三条必须写进作业票的要求。第一，接地：整机与工件、容器构成等电位连接，软管必须为导电型并端到端导通；防爆主机配普通软管，等于在最危险的位置留了一个静电放电点。第二，区域匹配：按现场区域划分（如 Zone 1/21）选型，不能用「看起来结实」替代认证等级；同时遵守现场隔离与接地程序，不得临时改接线或旁路保护。第三，与工艺联锁及动火协同：清扫作业不得与热作业在同一时间同一空间叠加，热作业需满足前述 LFL 判据并安排消防看护；作业期间保持连续机械通风。文件侧，把控制措施与颗粒物监测结果写进作业许可与 COSHH／职业卫生记录，这既是合规要求，也是事故后唯一能证明尽责的证据。企业层面建议按 NFPA 326 建立《储罐安全作业程序》，明确合格人员资质（如 API 认证或工业卫生师），每次作业前执行锁闭／挂牌、隔离、气体检测（氧含量、可燃气体、有毒气体），热作业许可证包含具体位置、类型及限制。

Most explosion-proof vacuum failures are not in the main unit but in the accessories and process. Three requirements that must be written into the work ticket. First, grounding: the whole machine, the workpiece, and the container form an equipotential bond, and the hose must be conductive type with end-to-end continuity; an explosion-proof main unit with a standard hose leaves a static-discharge point at the most dangerous location. Second, area matching: select by site zoning (e.g. Zone 1/21); do not substitute a certification level with 'looks solid'; follow site isolation and grounding procedures, and do not temporarily rewire or bypass protection. Third, interlock with process and hot-work coordination: cleaning must not be stacked in the same time and space as hot work; hot work must meet the LFL criteria above and arrange fire watch; maintain continuous mechanical ventilation during the job. On documentation, write controls and particulate-monitoring results into the work permit and COSHH/occupational-health records, this is both a compliance requirement and the only evidence of due diligence after an incident. At the enterprise level, build a Tank Safe Work Procedure per NFPA 326, define qualified-person competence (e.g. API certification or industrial hygienist), and before each job execute lockout/tagout, isolation, and gas testing (oxygen, flammable, toxic); the hot-work permit should specify location, type, and limits.

把方案落到设备清单：按区域而不是按功率选型

Turn the plan into an equipment list: select by zone, not by power

最后给一张按风险分层的配置思路。最高风险区（Zone 1/21，反应釜、储罐内部、含溶剂蒸气环境）：气动无电机吸尘器为主，配导电软管、抗静电滤材、可靠接地，过滤取 H13/H14；作业纳入受限空间与热作业许可体系。高风险区（可能形成爆炸性粉尘环境的装置区、催化剂转运点）：防爆型工业吸尘器（Ex 认证，按区域等级匹配），配脉冲反吹以维持长时作业风量，负压围挡＋LEV 联合使用。一般装置区与辅助区（无爆炸性环境判定，但存在细粉尘、油污与积水）：三相重工型吸尘器或干湿两用机型，重点是过滤等级、桶体材质与耐油耐腐蚀性；钢平台与桥架一律禁止干扫。行政区与控制室：常规工业吸尘即可。选型时请提供三组信息：区域危险划分（Zone 与设备保护级别）、粉尘性质（是否含硅、是否可燃、粒径分布）、作业形态（连续清扫、班后集中、检修停车期）。ApexClean（常州永乐环境工程有限公司）具备 25 年清洁设备制造经验，提供气动吸尘器、防爆工业吸尘器、脉冲反吹重工型与三相重工吸尘设备，可按区域分级出配置方案；但请注意：区域危险等级判定与作业许可必须由业主的工艺安全与 HSE 部门出具，设备选型只能在其结论之上进行。

Finally, a risk-layered configuration approach. Highest-risk zone (Zone 1/21, reactor interiors, tank interiors, solvent-vapor environments): pneumatic motor-free vacuums as the main choice, with conductive hoses, antistatic media, reliable grounding, H13/H14 filtration; work folded into confined-space and hot-work permit systems. High-risk zone (plant areas that may form an explosive dust atmosphere, catalyst transfer points): explosion-proof industrial vacuums (Ex certified, matched to zone level), with pulse-jet reverse blow to sustain long-run airflow, negative-pressure containment plus LEV combined. General plant and auxiliary areas (no explosive-atmosphere determination, but fine dust, oil, and water present): three-phase heavy-duty or wet/dry units, with the focus on filtration grade, tank material, and oil/corrosion resistance; dry sweeping banned on steel decks and trays. Administrative and control rooms: standard industrial vacuums suffice. When selecting, provide three sets of information: area hazard classification (Zone and equipment protection level), dust nature (silica-bearing, combustible, particle distribution), and operation form (continuous, end-of-shift, or shutdown maintenance). ApexClean (Changzhou Yongle Environmental Engineering Co., Ltd.) has 25 years of cleaning-equipment manufacturing experience and offers pneumatic vacuums, explosion-proof industrial vacuums, pulse-jet heavy-duty and three-phase heavy-duty units, with zone-graded configuration plans; but note: area hazard classification and work permitting must be issued by the owner's process-safety and HSE departments, equipment selection can only build on their conclusions.