城市门站的流量波动极大,北方城市冬季高峰是夏季的3到4倍,过滤器必须按高峰流量选型,不能按平均流量选。
门站过滤器直接保护超声波流量计和调压器,过滤精度选5μm即可,压损控制在0.01MPa以内,避免影响调压精度。
门站天然气相对干净(经过上游多级过滤),滤芯更换周期通常为18到24个月,是所有应用场景中最长的。
某北方城市门站按平均流量选了DN300过滤器,冬季高峰时压损超标,被迫在旁通管上临时加一台过滤器,改造费用是直接选DN400的2倍。
门站过滤器建议选卧式结构,滤芯更换方便,且有利于积液排放;立式结构在大流量下气流分布不均,边缘滤芯负荷偏高。
城市燃气门站是天然气从长输管线进入城市管网的门户,典型工况为:进口压力1.6MPa到4MPa,出口压力0.1MPa到0.4MPa,高峰流量1万到10万Nm³/h,管径DN200到DN500。门站的核心设备是调压器和流量计,过滤器安装在这些设备之前,去除天然气中的固体颗粒和少量液滴,保护计量和调压设备不受磨损和卡塞。
门站工况最突出的特点是流量波动大。城市燃气负荷有明显的季节性和日波动:北方城市冬季采暖期高峰流量是夏季的3到4倍,日内早高峰(6点到8点)和晚高峰(17点到20点)流量是低谷(凌晨2点到4点)的2倍。过滤器选型必须按冬季高峰小时流量计算,如果按平均流量选,冬季高峰时压损会严重超标。
门站下游的超声波流量计对液体和颗粒都很敏感。液体会附着在换能器表面导致信号衰减,颗粒会磨损流道改变流场分布,两者都会导致计量误差增大。国家标准GB/T 18604和CJ/T 467要求流量计上游气体含尘量不超过1mg/m³、含液量不超过0.1g/m³。调压器的阀座和膜片对大于10μm的颗粒敏感,颗粒会卡塞阀瓣导致调压精度下降或关闭不严。
因此门站过滤器的过滤精度通常选5μm,对5μm颗粒过滤效率不低于99%。压损要求更严格——门站进口压力本身不高(1.6到4MPa),经过滤器、流量计、调压器后要保证城市管网的0.1到0.4MPa出口压力。过滤器压损应控制在0.01MPa以内,整个门站总压损不超过0.05MPa。
Q1:城市门站过滤器按什么流量选型?高峰还是平均?
必须按冬季高峰小时流量选型。城市燃气的高峰月是1月,高峰日出现在最冷的那几天,高峰小时在早6点到8点。设计流量通常取计算月的最大小时流量,这个流量可能是年平均小时流量的3到4倍。如果按平均流量选,冬季高峰时过滤器内流速过高,压损会超过允许值,甚至导致滤芯被冲变形。我们建议在计算流量基础上再留20%余量,应对极端寒冷天气。
Q2:门站过滤器的压损控制在多少合适?
新滤芯初始压损应在0.005到0.01MPa之间。门站进口压力通常1.6到4MPa,看起来压损0.01MPa占比很小,但门站还有流量计压损(0.005到0.01MPa)和调压器压损(必须保留的最小压差0.1到0.2MPa)。如果过滤器压损过大,在进口压力偏低时可能导致调压器进口压力不足,出口压力调不上去。运行中压损达到0.05MPa时就应该安排更换滤芯,不要等到0.1MPa。
Q3:门站过滤器选立式还是卧式?
DN300以下立式和卧式都可以,DN400以上强烈建议卧式。卧式的优势:一是滤芯更换方便,人可以从端部人孔进入,不需要爬到顶部;二是筒体长度方向可以布置更多滤芯,大流量下滤芯间距更合理,气流分布更均匀;三是积液排放更顺畅,卧式筒体底部坡度设计可以让积液自动流向排污口。立式的优势是占地小,适合空间紧张的小型门站。
Q4:门站过滤器滤芯多久换一次?
门站来气经过上游长输管线和分输站的多级过滤,气体相对干净,滤芯更换周期通常为18到24个月。我们跟踪的20座城市门站数据显示,滤芯平均寿命21个月,最长的达到36个月(上游来气特别干净的站点),最短的是新投产门站(管道施工残留物多),约8个月。判断标准还是压差:达到0.05MPa安排更换,0.08MPa必须更换。
Q5:门站过滤器需要双联配置吗?
建议双联。城市门站承担全市或全区供气,不允许停气检修。虽然门站滤芯更换周期长(18到24个月),但更换时如果停气,影响范围很大。双联配置可以在不停气的情况下更换滤芯,切换操作简单(先充压再切换),下游压力波动小于0.02MPa。投资上双联比单台贵60%到80%,但避免了一次停气损失(城市门站停气一天可能影响数万用户),性价比很高。
大流量低流速设计:按冬季高峰流量选型,筒体截面平均流速控制在1.2m/s以下,过滤面风速0.05m/min以下,确保在高峰流量下压损仍不超过0.01MPa。
均匀气流分布:进口扩散管+弧形导流板+多孔管板三级分布,滤芯截面气流不均匀度±15%以内,避免局部滤芯过早堵塞,整体滤芯寿命延长20%。
卧式快开维护:DN400以上配DN500人孔,操作人员可进入筒体内部更换滤芯,单台更换时间不超过30分钟。快开端盖配回转臂,不需要吊装设备。
不停气双联切换:一开一备配三通切换阀,切换时间小于2分钟,下游压力波动小于0.02MPa。适合不允许中断供气的城市门站。
SCADA远程监控:压差变送器信号接入门站SCADA系统,可远程监控滤芯状态和排污液位。设置两级报警阈值,实现预测性维护。
自动排污:磁翻板液位计+自动排污阀,积液达到设定高度自动排放,不需要人工巡检。排污间隔可设定,避免人工遗忘导致积液被卷入气流。
型号 | 公称通径 | 公称压力 | 滤芯数量 | 额定流量 | 过滤精度 | 初始压损 |
|---|---|---|---|---|---|---|
MZ-200/40 | DN200 | PN40 | 12支 | 20000 Nm³/h | 5μm | ≤0.006MPa |
MZ-250/40 | DN250 | PN40 | 16支 | 35000 Nm³/h | 5μm | ≤0.007MPa |
MZ-300/40 | DN300 | PN40 | 20支 | 55000 Nm³/h | 5μm | ≤0.007MPa |
MZ-400/25 | DN400 | PN25 | 32支 | 90000 Nm³/h | 5μm | ≤0.008MPa |
MZ-500/25 | DN500 | PN25 | 44支 | 150000 Nm³/h | 5μm | ≤0.009MPa |
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1. 国家管网主干分输站
应用位置:西气东输/川气东送/陕京线等主干管道分输支路计量撬前端
核心功能:净化上游来气,保护超声流量计,保障与下游省网/城燃的贸易交接精度
典型工况:压力6.3~10MPa,单支路流量20000~80000 Nm³/h
配置要求:双筒并联+自动排污+SCADA接入,满足24小时连续分输
2. 省级管网分输站
应用位置:省网主干管道向各地市分输的支路计量装置前端
核心功能:去除管道输送产生的铁锈、粉尘,保障省网与城燃企业的贸易结算准确
典型配置:过滤精度3μm,双筒并联,压差远传至省网调度中心
3. 城市燃气接收门站
应用位置:长输管道分输至城市门站的终端计量撬前端
核心功能:高压过滤分离,保护门站进站流量计,确保城燃企业购气计量准确
特殊要求:适应气量昼夜波动大、季节性峰谷差大的特点
4. 大型工业用户直供分输
应用位置:向电厂、化工厂、玻璃厂等大型用户直供的分输支路
核心功能:大流量高精度过滤,保障大用户贸易交接计量,避免计量纠纷
配套形式:与分输调压、计量、色谱分析系统集成于分输撬
5. 储气库分输外输站
应用位置:储气库采气期外输分输支路计量前端
核心功能:过滤地层返出气中的杂质,保障外输贸易计量精度
特殊设计:适应采气期气质波动,前置旋风分离+后置精滤两级配置
6. LNG接收站分输计量
应用位置:LNG气化后外输分输支路计量装置前端
核心功能:过滤气化残留杂质,保障分输至省网/城燃的计量准确性
工况特点:大流量、高压(>6MPa)、气质洁净度要求高
