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密相气力输送系统Dense phase pneumatic conveying system
日期:2025-05-01 18:54
浏览次数:35
摘要:密相气力输送系统Dense phase pneumatic conveying system,密相气力输送系统,真空输送设备
密相气力输送系统Dense phase pneumatic conveying system,密相气力输送系统,真空输送设备
以下是对 **密相气力输送系统(Dense Phase Pneumatic Conveying System)** 的中英文双语言详解,从原理、特点到行业应用**覆盖,分模块呈现:

### **系统概述 | Overview**
密相气力输送是一种 **低速、高浓度** 的物料输送技术,通过压缩空气(压力0.1-0.6 MPa)推动物料在管道中以“栓流”或“波状流”形式移动。适用于易碎、高磨损或需长距离(≤500米)输送的颗粒/粉体,如再生塑料颗粒、碳黑、金属粉末等。
Dense phase pneumatic conveying is a **low-speed, high-concentration** material handling technology. It uses compressed air (0.1-0.6 MPa) to push materials in "plug flow" or "wave flow" through pipelines. Ideal for fragile, abrasive, or long-distance (≤500m) transport of pellets/powders (e.g., recycled plastics, carbon black, metal powders).
### **核心组成 | Core Components**
1. **发送罐 | Pressure Vessel**
- 耐压设计(≥1.0 MPa),配备料位计与流化装置,确保物料均匀进入管道。
- Pressure-rated (≥1.0 MPa) with level sensors and fluidization plates for uniform material entry.
2. **压缩空气系统 | Air Supply Unit**
- 变频空压机(15-75 kW)+ 储气罐(缓冲压力波动)。
- VFD compressors (15-75 kW) + air receivers (dampening pressure surges).
3. **输送管道 | Conveying Pipeline**
- 内衬陶瓷/超高分子聚乙烯(UHMWPE),弯头曲率半径≥8倍管径以减少磨损。
- Ceramic/UHMWPE-lined pipes with bend radius ≥8× pipe diameter to minimize wear.
4. **分离与过滤单元 | Separation & Filtration**
- 旋风分离器(分离效率≥99%)+ 脉冲反吹除尘器(排放浓度≤10 mg/m³)。
- Cyclone separators (≥99% efficiency) + pulse-jet dust filters (emission ≤10 mg/m³).
### **工作原理 | Working Principle**
1. **填充阶段**:物料在发送罐内加压,形成密相料栓;
2. **输送阶段**:压缩空气推动料栓在管道中低速移动(速度1-10 m/s);
3. **排放阶段**:物料在接收仓减压分离,空气经净化后排出。
---
1. **Filling Phase**: Material is pressurized in the vessel to form dense-phase plugs.
2. **Conveying Phase**: Compressed air pushes plugs at low velocity (1-10 m/s).
3. **Discharge Phase**: Material is separated in receiver, air is purified and vented.
### **关键特点 | Key Features**
| 中文 | English |
|------|---------|
| **低破碎率** | Low breakage (e.g., <0.1% for glass beads) |
| **高输送比** | High solid-air ratio (30:1 ~ 200:1) |
| **节能** | Energy-efficient (30-50% lower power vs. dilute phase) |
| **低磨损** | Reduced pipeline abrasion (wear rate ≤0.1 mm/1000t) |
| **防分层** | Minimized material segregation |
### **与稀相输送对比 | Dense vs. Dilute Phase**
| 参数 | 密相输送 | 稀相输送 |
|---------------------|--------------------------|--------------------------|
| **气流速度** | 1-10 m/s | 15-30 m/s |
| **适用物料** | 易碎、高密度、磨蚀性物料 | 轻质、非磨蚀性物料 |
| ***大距离** | ≤500 m | ≤100 m |
| **能耗(吨/公里)** | 0.5-1.2 kW·h | 2.0-3.5 kW·h |
### **行业应用 | Applications**
- **塑料回收**:再生PET/PE颗粒的长距离输送(避免热降解);
*Plastic Recycling*: Long-distance conveying of rPET/rPE pellets (prevents thermal degradation).
- **化工行业**:碳黑、二氧化硅粉体的无尘输送(防爆炸风险);
*Chemical*: Dust-free handling of carbon black/silica (ATEX compliance).
- **食品工业**:奶粉、淀粉的卫生级输送(符合FDA 21 CFR);
*Food*: Hygienic transport of milk powder/starch (FDA 21 CFR compliant).
### **优势与效益 | Benefits**
1. **保护物料完整性**:速度可控,避免塑料颗粒因碰撞导致分子链断裂(拉伸强度保留率≥95%)。
*Material Integrity*: Controlled velocity prevents polymer chain breakage (tensile strength retention ≥95%).
2. **降低维护成本**:管道寿命延长3-5倍,年维护费用减少40%。
*Maintenance*: Pipeline lifespan extended 3-5x, annual upkeep reduced by 40%.
3. **环保合规**:全封闭设计,粉尘泄漏量<1 ppm,满足OSHA 1910.94标准。
*Environment*: Fully enclosed system with dust leakage <1 ppm (OSHA 1910.94 compliant).
### **选型建议 | Selection Guide**
- **物料特性**:堆积密度>500 kg/m³或颗粒尺寸>3 mm时优先选择密相输送;
*Material Property*: Choose dense phase if bulk density >500 kg/m³ or particle size >3 mm.
- **系统定制**:针对PVC等静电敏感材料,需增加抗静电涂层管道+湿度控制(RH 40-60%)。
*Customization*: For static-sensitive materials (e.g., PVC), use anti-static pipes + humidity control.
如需根据具体物料(如尼龙66)或产能(如20吨/小时)提供详细方案,请提供参数!