**Technical guide for Roots blower pneumatic conveying equipment**
The Roots blower pneumatic conveying system is a reliable solution for conveying powder and granular materials, widely used in industries such as chemical, food, pharmaceutical, and building materials. The following is the technical analysis of the system:
1、 System composition and working principle
1. * * Core Components * *:
-Roots blower: Provides stable air source (pressure range 9.8-98kPa)
-* * Feeding device * *: rotary valve, Venturi feeder, etc
-* * Conveyor pipeline * *: Wear resistant steel pipe/stainless steel pipe (DN50-DN300)
-* * Separation system * *: Cyclone separator+bag filter
-* * Control System * *: PLC+Variable Frequency Drive
2. * * Workflow * *:
```mermaid
graph LR
A Roots blower -->B Feeding device
B -->C [Pipeline]
C -->D [Separation System]
D -->E [Finished Product Warehouse]
```
2、 Comparison of transportation methods
|Type | Gas solid ratio | Wind speed (m/s) | Applicable scenarios|
|------|--------|-----------|----------|
|Dilute phase conveying | 10-30 | 15-30 | Lightweight powders (flour, starch)|
|Dense phase transportation | 5-15 | 5-12 | High density particles (cement, mineral powder)|
|Semi dense phase conveying | 15-25 | 10-20 | Mixed materials|
3、 Key design parameters
1. * * Airflow Calculation * *:
\[
Q = \frac{G}{\mu \rho_a} \times 1.2
\]
-G: Conveying capacity (kg/h)
-μ: Gas-solid ratio
-ρ: Air density (1.2kg/m3)
2. * * Pressure loss calculation * *:
\[
\Delta P = \lambda \frac{L}{D} \frac{\rho v^2}{2} + \sum \xi \frac{\rho v^2}{2}
\]
-λ: Friction coefficient (0.02-0.04)
-L: Pipeline length (m)
3. * * Power verification * *:
\[
P = \frac{Q \Delta P}{6120 \eta}
\]
-η: Overall efficiency (0.65-0.8)
4、 Wear resistant solution
1. Pipeline processing technology:
|Technology | Hardness (HV) | Extended lifespan|
|------|----------|----------|
|Ceramic lining | 1200-1500 | 3-5 times|
|Quenching treatment | 600-800 | 2-3 times|
|Polyurethane coating | 90-95 Shore D | 1.5-2 times|
2. * * Fan protection measures * *:
-Tungsten carbide spray coating on impeller surface (C ≥ 65)
-Pre cyclone separator (dust removal efficiency ≥ 95)
-Air intake filter (precision 5 μ m)
5、 Intelligent control system
1. * * Control mode * *:
-* * Constant pressure control * *: Maintain stable pipeline pressure (± 2)
-Variable Flow Control: Automatically adjusts based on material quantity
-Interlocking: Triple protection for pressure, temperature, and vibration
2. * * Monitoring Parameters * *:
-Real time air volume (accuracy ± 1.5)
-Pipeline pressure (4-20mA signal)
-Bearing temperature (PT100 sensor)
6、 Typical fault handling
|Fault phenomenon | Possible cause | Solution|
|----------|----------|----------|
|Decreased conveying capacity | Pipeline wear and leakage | Ultrasonic thickness measurement inspection|
|Large pressure fluctuations | Unstable feeding | Adjust the speed of the rotary valve|
|Fan overheating | Excessive system resistance | Check the differential pressure of the dust collector|
7、 Energy efficiency optimization plan
1. * * System level optimization * *:
-Adopting a variable diameter pipeline design (gradually reducing the diameter of each section)
-Optimize the number of elbows (R/D ≥ 5)
-Waste heat recovery and utilization (when exhaust temperature>80 ℃)
2. * * Device level optimization * *:
-Permanent magnet variable frequency motor (IE4 energy efficiency)
-Impeller profile (efficiency improvement of 5-8)
-Intelligent lubrication system (fuel consumption reduced by 30%)
8、 Selection service process
1. Material characteristic testing (bulk density, particle size distribution, etc.)
2. Transportation scheme simulation (EDEM+FLUENT coupling analysis)
3. Prototype system testing (1:1 test platform)
4. On site installation and debugging (laser alignment accuracy ≤ 0.05mm)
9、 Industry application cases
1. * * Cement industry * *:
-Conveying capacity: 80t/h
-Pressure: 68.6kPa
-Configuration: Dual fan redundant system
2. * * Food industry * *:
-Material: 316L stainless steel
-Certification: FDA+GMP
-Features: CIP cleaning system
3. * * Chemical industry * *:
-Explosion proof grade: Ex d IIC T4
-Special requirement: Nitrogen protection system
10、 Maintenance Plan
1. * * Daily check * *:
-Vibration monitoring (daily recording)
-Lubricating oil level (checked weekly)
2. * * Regular maintenance * *:
|Cycle | Maintenance Content|
|------|----------|
|500h | Replace lubricating oil|
|2000h | Check the impeller clearance|
|8000h | Disassembly and Inspection|
Note: It is recommended to configure an online monitoring system to achieve predictive maintenance. For high-value material conveying systems, it is recommended to use a dual machine backup configuration. Actual selection needs to be calculated based on material characteristic test data.
