CN105479875A - 耐高温阶梯过滤式气固分离复合过滤毡 - Google Patents
耐高温阶梯过滤式气固分离复合过滤毡 Download PDFInfo
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Abstract
本发明属于气固分离技术领域，涉及耐高温阶梯过滤式气固分离复合过滤毡，由上到下依次连接有粗旦涤纶短纤维制成的无纺布层、聚四氟乙烯基布层或涤纶基布层、细旦涤纶纤维制成的无纺布层和聚四氟乙烯微孔膜薄膜层，优点是：本发明的耐温性能高，耐氧化性能好，过滤精度高、运行阻力小，滤材的利用率高，便于清灰，适用于气固分离过滤装置。
Description
技术领域
本发明属于气固分离技术领域，特指一种耐高温阶梯过滤式气固分离复合过滤毡。
背景技术
燃煤锅炉或钢铁厂、电厂的烟气除尘，根据国家环保部门的要求，粉尘排放浓度应控制在20mg/m3以下，以前一般采用的是PPS耐酸碱过滤毡，但根据实际情况，由于在电除尘过程中会产生氧化性能大的臭氧和氮氧化物，这些气体在一定的温度下，与PPS耐酸碱滤料会发生反应，导致其结构的破坏，滤料的各项指标损失较大，无法满足除尘的要求，达不到设计的使用寿命要求和粉尘排放要求。为此，CN203944225U公开了一种《燃煤锅炉尾气除尘用抗氧化耐高温梯度过滤毡》，该过滤毡是在中间层PTFE长丝基布的两面通过针刺机对称穿刺复合纤维层，两侧的复合纤维层刺入中间层PTFE长丝基布相互缠结形成有梯度结构的过滤毡，迎风面的复合纤维层上覆盖有一层超细网状薄膜，实际上，中间层PTFE长丝基布的两面通过针刺机对称穿刺复合纤维层形成的结构并不像申请人所述的“有梯度结构的过滤毡”，过滤过程由细到粗的理念无法实现，过滤通道未形成小透气到大透气的顺畅关系，过滤效率较低，前后部阻力分配未合理，影响的气流通过，使得过滤不畅。
发明内容
本发明的目的是提供一种滤材的利用率高、过滤效果好的耐高温阶梯过滤式气固分离复合过滤毡。
本发明的目的是这样实现的：
耐高温阶梯过滤式气固分离复合过滤毡，由上到下依次连接有粗旦涤纶短纤维制成的无纺布层、聚四氟乙烯基布层或涤纶基布层、细旦涤纶纤维制成的无纺布层和聚四氟乙烯微孔膜薄膜层。
上述的粗旦涤纶短纤维制成的无纺布层的厚度是1～4mm。
上述的聚四氟乙烯基布层或涤纶基布层的厚度是0.2～0.4mm。
上述的细旦涤纶纤维制成的无纺布层的厚度是1～4mm。
上述的聚四氟乙烯微孔膜薄膜层的厚度是0.01～0.05mm。
上述的粗旦涤纶短纤维制成的无纺布层、聚四氟乙烯基布层或涤纶基布层、细旦涤纶纤维制成的无纺布层依次叠加后通过针刺复合连接。
上述的细旦涤纶纤维制成的无纺布层与聚四氟乙烯微孔膜薄膜层之间通过热合粘合连接。
上述的粗旦涤纶短纤维、细旦涤纶纤维可用芳纶1313或PPS或TLCP耐高温纤维替代。
上述的细旦涤纶纤维制成的无纺布层中含有2～10％的熔点为180～200℃的低熔点细旦涤纶纤维、90～98％的熔点为240～260℃的高熔点细旦涤纶纤维，使得细旦涤纶纤维制成的无纺布层与聚四氟乙烯微孔膜薄膜层热合连接时，2～10％的低熔点的细旦涤纶纤维被熔化并用于粘接，形成透气且致密的细旦涤纶纤维制成的无纺布层，弥补细旦、粗旦层在针刺时相互穿透造成的梯度损失，所述低熔点细旦涤纶纤维还可以是尼龙包覆涤纶形成的低熔点纤维或低分子阻燃剂。
上述的细旦涤纶纤维制成的无纺布层与聚四氟乙烯微孔膜薄膜层热合连接是：聚四氟乙烯微孔膜薄膜层的外侧使用280～320℃温度的热压辊，粗旦涤纶短纤维制成的无纺布层、聚四氟乙烯基布层或涤纶基布层、细旦涤纶纤维制成的无纺布层通过针刺连接后的粗旦涤纶短纤维制成的无纺布层的外侧使用常温的冷压辊，热压辊与冷压辊配合将聚四氟乙烯微孔膜薄膜层与细旦涤纶纤维制成的无纺布层热合连接。
本发明相比现有技术突出且有益的技术效果是：
1、耐温性能高：本发明的中间层使用的耐聚四氟乙烯微孔膜和基布的熔点为300～330℃，涤纶的熔点一般在255～260℃之间，能适应高温使用场合。
2、耐氧化性能好：本发明的聚四氟乙烯和涤纶均具有很好的耐氧化性能，耐氧化性能得到了很好的提高。
3、过滤精度高、运行阻力小：本发明的过滤过程是：烟气经过聚四氟乙烯微孔膜薄膜层的一级过滤区时过滤了的大量的固体颗粒例如烟灰等，再依次经过细旦涤纶纤维制成的无纺布层的二级过滤、聚四氟乙烯基布层或涤纶基布层为耐温结构骨架、粗旦涤纶短纤维制成的无纺布层三级过滤后，排除的气体达到排放的标准要求，由于过滤过程的过滤精度一级比一级低，形成的阶梯过滤为扩散性的气流通道，气流流通顺畅，运行阻力小。
4、由于细旦涤纶纤维制成的无纺布层通常使用的细旦涤纶纤维的熔点为240～260℃，用该原料制成的无纺布层的致密度达不到本申请需要的过滤精度和过滤效果，为了提高该过滤层的过滤精度，本发明在熔点为240～260℃的细旦涤纶纤维材料中加入了重量百分比为2～10％的熔点为180～200℃的低熔点细旦涤纶纤维，这样热压辊与冷压辊配合将聚四氟乙烯微孔膜薄膜层与细旦涤纶纤维制成的无纺布层热合连接时，刚好将2～10％的低熔点细旦涤纶纤维熔化，熔化后的低熔点细旦涤纶纤维对没有熔化的细旦涤纶纤维和聚四氟乙烯微孔膜薄膜层进行粘接，又由于低熔点细旦涤纶纤维的熔化以及热压辊与冷压辊的压力，使得细旦涤纶纤维制成的无纺布层的厚度变小，致密度提高，过滤精度提高。
5、本发明适用于气固分离过滤装置。
附图说明
图1是本发明的剖视图。
具体实施方式
下面结合附图以具体实施例对本发明作进一步描述，参见图1：
耐高温阶梯过滤式气固分离复合过滤毡，由上到下依次连接有粗旦涤纶短纤维制成的无纺布层10、聚四氟乙烯基布层20或涤纶基布层、细旦涤纶纤维制成的无纺布层30和聚四氟乙烯微孔膜薄膜层40。
上述的粗旦涤纶短纤维制成的无纺布层10的厚度H1是1～4mm。
上述的聚四氟乙烯基布层20或涤纶基布层的厚度H2是0.2～0.4mm。
上述的细旦涤纶纤维制成的无纺布层30的厚度H3是1～4mm。
上述的聚四氟乙烯微孔膜薄膜层40的厚度H4是0.01～0.05mm。
上述的粗旦涤纶短纤维制成的无纺布层、聚四氟乙烯基布层或涤纶基布层、细旦涤纶纤维制成的无纺布层依次叠加后通过针刺复合连接。
上述的细旦涤纶纤维制成的无纺布层与聚四氟乙烯微孔膜薄膜层之间通过热合粘合连接。
上述的粗旦涤纶短纤维、细旦涤纶纤维可用芳纶1313或PPS或TLCP耐高温纤维替代。
上述的细旦涤纶纤维制成的无纺布层中含有2～10％的熔点为180～200℃的低熔点细旦涤纶纤维、90～98％的熔点为240～260℃的高熔点细旦涤纶纤维，使得细旦涤纶纤维制成的无纺布层与聚四氟乙烯微孔膜薄膜层热合连接时，2～10％的低熔点的细旦涤纶纤维被熔化并用于粘接，形成透气且致密的细旦涤纶纤维制成的无纺布层，弥补细旦、粗旦层在针刺时相互穿透造成的梯度损失，所述低熔点细旦涤纶纤维还可以是尼龙包覆涤纶形成的低熔点纤维或低分子阻燃剂。
上述的细旦涤纶纤维制成的无纺布层与聚四氟乙烯微孔膜薄膜层热合连接是：聚四氟乙烯微孔膜薄膜层的外侧使用280～320℃温度的热压辊，粗旦涤纶短纤维制成的无纺布层、聚四氟乙烯基布层或涤纶基布层、细旦涤纶纤维制成的无纺布层通过针刺连接后的粗旦涤纶短纤维制成的无纺布层的外侧使用常温的冷压辊，热压辊与冷压辊配合将聚四氟乙烯微孔膜薄膜层与细旦涤纶纤维制成的无纺布层热合连接。
所述的粗旦涤纶纤维为3～12D×51～65mm的粗旦涤纶纤维，所述的细旦涤纶纤维为1.5D×51mm(8％)+1D×51mm(12％)+2D×51mm(30％)+3D×65mm(50％)的细旦涤纶纤维，以上二个铺网各200g/m2；涤纶基布120g/m2；聚四氟乙烯膜的厚度为0.012mm；成品520g/m2～540g/m2；或采用PPS：粗旦6D×65mm，细旦2D×51mm；聚四氟乙烯基布126g/m2，细旦涤纶纤维制成的无纺布层与聚四氟乙烯微孔膜薄膜层热合连接的贴合温度为285℃。
上述实施例仅为本发明的较佳实施例，并非依此限制本发明的保护范围，故：凡依本发明的结构、形状、原理所做的等效变化，均应涵盖于本发明的保护范围之内。
Claims (10)
1.耐高温阶梯过滤式气固分离复合过滤毡，其特征在于：由上到下依次连接有粗旦涤纶短纤维制成的无纺布层、聚四氟乙烯基布层或涤纶基布层、细旦涤纶纤维制成的无纺布层和聚四氟乙烯微孔膜薄膜层。
2.根据权利要求1所述的耐高温阶梯过滤式气固分离复合过滤毡，其特征在于：所述的粗旦涤纶短纤维制成的无纺布层的厚度是1～4mm。
3.根据权利要求1所述的耐高温阶梯过滤式气固分离复合过滤毡，其特征在于：所述的聚四氟乙烯基布层或涤纶基布层的厚度是0.2～0.4mm。
4.根据权利要求1所述的耐高温阶梯过滤式气固分离复合过滤毡，其特征在于：所述的细旦涤纶纤维制成的无纺布层的厚度是1～4mm。
5.根据权利要求1所述的耐高温阶梯过滤式气固分离复合过滤毡，其特征在于：所述的聚四氟乙烯微孔膜薄膜层的厚度是0.01～0.05mm。
6.根据权利要求1所述的耐高温阶梯过滤式气固分离复合过滤毡，其特征在于：所述的粗旦涤纶短纤维制成的无纺布层、聚四氟乙烯基布层或涤纶基布层、细旦涤纶纤维制成的无纺布层依次叠加后通过针刺复合连接。
7.根据权利要求6所述的耐高温阶梯过滤式气固分离复合过滤毡，其特征在于：所述的细旦涤纶纤维制成的无纺布层与聚四氟乙烯微孔膜薄膜层之间通过热合粘合连接。
8.根据权利要求1所述的耐高温阶梯过滤式气固分离复合过滤毡，其特征在于：所述的粗旦涤纶短纤维、细旦涤纶纤维可用芳纶1313或PPS或TLCP耐高温纤维替代。
9.根据权利要求1～8任一项所述的耐高温阶梯过滤式气固分离复合过滤毡，其特征在于：所述的细旦涤纶纤维制成的无纺布层中含有2～10％的熔点为180～200℃的低熔点细旦涤纶纤维、90～98％的熔点为240～260℃的高熔点细旦涤纶纤维，使得细旦涤纶纤维制成的无纺布层与聚四氟乙烯微孔膜薄膜层热合连接时，2～10％的低熔点的细旦涤纶纤维被溶化并用于粘接，形成透气且致密的细旦涤纶纤维制成的无纺布层，所述低熔点细旦涤纶纤维还可以是尼龙包覆涤纶形成的低熔点纤维或低分子阻燃剂。
10.根据权利要求9所述的耐高温阶梯过滤式气固分离复合过滤毡，其特征在于：所述的细旦涤纶纤维制成的无纺布层与聚四氟乙烯微孔膜薄膜层热合连接是：聚四氟乙烯微孔膜薄膜层的外侧使用280～320℃温度的热压辊，粗旦涤纶短纤维制成的无纺布层、聚四氟乙烯基布层或涤纶基布层、细旦涤纶纤维制成的无纺布层通过针刺连接后的粗旦涤纶短纤维制成的无纺布层的外侧使用常温的冷压辊，热压辊与冷压辊配合将聚四氟乙烯微孔膜薄膜层与细旦涤纶纤维制成的无纺布层热合连接。
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