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衬四氟塔

核心规范:GB/T 25151(化工设备衬里技术条件).ASME BPE(生物加工设备标准).EN 12502(金属材料防腐蚀指南)

产品介绍

衬四氟塔技术规范

1. 设计标准

核心规范

GB/T 25151(化工设备衬里技术条件)

ASME BPE(生物加工设备标准)

EN 12502(金属材料防腐蚀指南)

 

结构设计

金属壳体按GB 150/ASME VIII Div.1

衬层粘接强度≥5 MPa(ASTM D4541)

 

工艺验证

电火花检测:≥15 kV无击穿(ISO 2746)

真空负压检测:-0.095 MPa保压30分钟无脱层

 

2. 材质

组件

材质选项

特性说明

金属壳体

Q235B/Q245R/Q345R/304/316L

提供结构支撑

衬里层

PTFE(聚四氟乙烯)

厚度2~5mm,耐强腐蚀

过渡层

PFA(可熔性聚四氟乙烯)

增强PTFE与金属结合力

密封件

改性PTFE + 玻纤填充

抗蠕变、耐高温压缩

3. 尺寸规格

直径范围DN 300 – DN 4000 mm

高度限制≤25 m(防衬层自重变形)

 

工作压力

正压:1.6 MPa(带加强环设计)

负压:≥-0.09 MPa(需支撑骨架)

 

温度范围-50℃ ~ +170℃(短时200℃)

 

4. 主要用途

行业

典型应用场景

化工

盐酸/氢氟酸吸收塔、混酸再生塔

制药

高纯度溶剂回收塔、API反应塔

电子

蚀刻液废气处理塔、超纯酸洗塔

环保

含氟废气洗涤塔、电镀酸雾净化塔

5. 技术优势

极致耐腐蚀:耐受王水、氢氟酸、浓硫酸等所有强酸强碱

零污染风险PTFE符合FDA 21 CFR 177.1550食品级认证

低摩擦特性:表面能18 dynes/cm,防结垢易清洗

寿命成本比:比哈氏合金塔成本低60%,寿命>10年

热绝缘性能:导热系数0.25 W/m·K,减少外部保温层

关键设计禁忌

温度骤变:升温/降温速率≤25℃/h,防止衬层开裂

机械冲击:禁止硬物撞击衬里表面(莫氏硬度仅3~4)

局部过热:蒸汽喷嘴需加扩散器,避免>250℃热冲击

负压极限:真空度>0.095 MPa时必须用金属骨架支撑

 

特殊工艺选项

衬层增强

玻纤布加强PTFE(用于含固体颗粒介质)

石墨填充PTFE(提升导热性)

 

检测技术

红外热成像检测衬层贴合度

超声波测厚监控衬层磨损

注:实际设计需进行热应力仿真PTFE与金属膨胀系数差10倍)及流体动力学分析(防局部湍流磨损衬层)

 

PTFE-Lined Tower Technical Specifications

1. Design Standards

Primary Codes:

ASME B31.3 (Process Piping)

ISO 28706 (Vitreous Enamel & PTFE Lining)

ASTM D1784 (Plastic Material Standards)

 

Structural Design:

Metallic shell per ASME VIII Div.1

Lining bond strength ≥5 MPa (ASTM D4541)

 

Quality Verification:

Spark test: ≥15 kV no breakdown (DIN EN 14430)

Vacuum test: -0.095 MPa held for 30 min no delamination

2. Material Specifications

Component

Material Options

Key Properties

Shell

Carbon Steel/304/316L

Structural integrity

Lining

PTFE (Polytetrafluoroethylene)

2~5mm thick, corrosion-proof

Adhesive

PFA (Perfluoroalkoxy)

Enhanced bonding strength

Seals

Glass-filled PTFE

Low cold flow, high temp resistance

3. Dimensions & Configuration

Diameter: DN 300 – DN 4000 mm

Max Height: ≤25 m (anti-sagging design)

 

Pressure Range:

Positive: ≤1.6 MPa (with stiffening rings)

Negative: ≥-0.09 MPa (requires support grids)

 

Temperature: -58°F ~ +392°F (short-term 446°F)

 

4. Key Applications

Industry

Typical Use Cases

Chemical

HCl/HF absorption, mixed acid regeneration

Pharmaceutical

High-purity solvent recovery, API reaction

Electronics

Etchant gas scrubbers, ultra-pure acid cleaning

Environmental

Fluoride exhaust treatment, plating fume towers

5. Technical Advantages

Unmatched Corrosion Resistance: Handles aqua regia, HF, conc. H₂SO₄, etc.

Zero Contamination: FDA 21 CFR 177.1550 compliant

Non-stick Surface: Contact angle 110°, prevents scaling

Lifecycle Economy: 60% cost saving vs. Hastelloy, service life >10 years

Thermal Insulation: k=0.25 W/m·K reduces external insulation needs

 

6. Critical Design Prohibitions

Thermal Shock:

Heating/cooling rate ≤25°C/h to prevent lining cracking.

 

Mechanical Impact:

Hard object impact on lined surfaces is strictly prohibited (Mohs hardness only 3-4).

 

Localized Overheating:

Steam nozzles require diffusers to avoid >250°C thermal shock.

 

Vacuum Limit:

Metal support grids must be used when vacuum exceeds 0.095 MPa.

 

7.Special Process Options

Lining Reinforcement:

Glass-fiber reinforced PTFE (for media containing solid particles).

Graphite-filled PTFE (enhances thermal conductivity).

 

Inspection Technologies:

Infrared thermography for lining bonding integrity.

Ultrasonic thickness monitoring for lining wear.

Note: Actual design requires:

Thermal stress simulation (PTFE and metal have 10× difference in thermal expansion coefficient)

Fluid dynamics analysis (prevents localized turbulent flow erosion)


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