PDF《除尘系统防爆设计》

除尘系统防爆设计 The Explosion-proof design of dust collection system 2018年11月20日November 20,

2018 李盛东 Robert Li 唐纳森亚太区IAF产品技术经理 Donaldson APAC IAF Product Engineering Manager 目录 Agenda ? 了解您的气流 Know Your Air Stream ? 除尘器的选项 Dust Collection Options ? 基于习惯性与基于性能减灾策略的对比 Prescriptive vs Performance Based Mitigation ? 案例研究 Case Studies 了解您的气流 Know Your Air Stream 空气中含有什么物质What chemical agents are in the air stream - 颗粒和/或气体 Particulate and/or gases - 是否可以循环回到厂房内,应该循环回去吗?Can they be returned to the facility, and should they? - 不可知的毒性物质或者接触限值?Unknown toxicity or exposure levels 可燃性粉尘测试 Combustible Dust Testing - Kst and Pmax - 最低点火能量 Minimum Ignition Energy (MIE) - 可燃下限 C 气体 Lower Flammable Limit (LFL) C gases - 爆炸下限浓度 C颗粒 Minimum Explosible Concentration (MEC) - particulate 评估气流中的物质含量 Evaluate What's in the Air Stream 除尘器选项 Dust Collection Options ? 除尘器种类 Type of dust collector ? 除尘器安装地点 Location of dust collector ? 配置选项 Configurable options 除尘器种类 Type of Dust Collector ? 过滤式除尘器―传统的袋式或者滤筒式 Media Collectors C traditional baghouse or cartridge ? 湿式除尘器―沉淀器 Wet Collectors C precipitators ? 机械式除尘器―旋风除尘器Mechanical Collectors C cyclone ? 无外壳除尘器 Enclosureless Collectors 安装位置―室内对室外 Location C Indoors vs Outdoors 配置选项 -- 灰斗 Configurable Options C Hoppers 配置选项 C 进风口 Configurable Options C Inlets 配置选项 C 模块单元 Configurable Options C Modular Units 减灾选项 Mitigation Options NFPA

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2.4 C 合规选项 Compliance Options - 习惯性解决方法Prescriptive methods ? 在NFPA 652和特定工业标准的各个章节中有相关的规定Stated in various chapters for both

652 and industry-specific standards - 基于性能的解决方法Performance-based methods ? 习惯性解决方法的替代方案 Alternative to prescriptive methods ? 第三方文件和其他资源支持 Supported by 3rd party documentation and other resources ? 工厂设施通常会采用基于习惯性和基于性能的解决方法的混合方案 Facilities are usually designed by a mixture of both performance- based and prescriptive design methods. 习惯性方法 Prescriptive Method ? 防爆保护Explosion Protection - 泄爆(标准和无焰泄爆)Venting (standard and flameless) - 化学抑爆 Chemical suppression - 抗爆 C 对于除尘器来说,一般不可行Containment C typically not feasible in dust collection - 无外壳除尘器 Enclosureless collectors ? 爆炸阻止 Explosion Prevention - 入口和出口隔离 Inlet and outlet isolation - 灰斗卸灰 Hopper discharge - 在工艺和独立设备之间Between processes or pieces of equipment - 火花熄灭 Spark abatement ? 防火保护Fire Protection - 水或者二氧化碳 Water or CO2 工艺之间的隔离 Isolate Between Processes 各种隔离方法Various methods of isolation - 被动或者主动Passive or active - 机械的或者化学的Mechanical or chemical - 灰斗卸灰(卸灰阀)Hopper discharges (airlocks) 火灾的防护 Fire Protection and Prevention ? 保护 Protection - 水或者喷淋系统 Water or sprinkler systems - 二氧化碳系统CO2 systems ? 阻止 Prevention - 进风口和出风口隔断阀 Inlet and outlet dampers - 隔断门 Abort gates - 火花熄灭系统 Spark abatement systems - 火花冷却器 Spark Cooler 基于性能的解决方法 Performance Based Methods ? 是NFPA中描述的习惯性方法的替代解决方案 An alternative approach to the prescriptive methods described in NFPA ? 参考通用和特定行业标准 Referenced in general and industry-specific standards ? 应用和工艺中的合理措施 Do what makes sense for the application or process ? 一般需要第三方测试或者其他文件来证明其有效性 Typically requires 3rd party testing or other documentation to help validate claims DFE除尘器 DFE Collector 当除尘器的排放空气循环进入厂房或者工艺中时, NFPA要求在 回风管道上加装隔离装置,以阻止火焰和/或颗粒循环返回 When recirculating air from a dust collector back into a building or process, NFPA requires outlet isolation on the return duct to stop flame and/or particulate from entering the area. 唐纳森DFE除尘器 Donaldson's DFE Collector - 第三方测试表明:在所有测试中,DFE除尘器成功的隔离了爆燃,没有 火焰和火花可以进入干净空气室 Third party testing showed that "In all tests, the filters successfully isolated the deflagration and allowed no flame or sparks to pass into the clean air plenum." - 在等待权威部门的审核中,这可以认为是基于性能的可以去除回风管道 上隔离阀的替代方案 Pending an AHJ's approval, this could be seen as a performance based alternative to requiring outlet isolation on the return duct.