As a key equipment in industrial production, the abnormal increase in outlet temperature of multi-stage blower will directly affect the service life of equipment and system safety. When the outlet temperature exceeds the design standard (usually>120 ℃), it often indicates that there is a hidden danger in the system. The following are the six core causes of temperature rise and corresponding solutions:
1、 Mechanical factors
Rotor dynamic balance imbalance
Phenomenon: Accompanied by abnormal vibration (amplitude>0.08mm)
Reason: Uneven quality distribution caused by impeller fouling or wear
Solution: Perform dynamic balance verification every 2000 hours and replace blades with excessive wear and tear
Bearing lubrication failure
Data characterization: Bearing temperature>85 ℃
Common faults:
Lubricating oil viscosity does not meet the standard (below ISO VG68)
Lubrication pipeline blockage (flow rate<70% of rated value)
Solution: Use synthetic grease instead and install an online oil filtration device
2、 Pneumatic system issues
Excessive intake resistance
Judgment criteria: Imported vacuum degree>15kPa
cause:
The filter pressure difference exceeds the standard (more than 3 times the initial pressure difference)
Too many bends in the pipeline (more than 5 90 ° bends)
Improvement plan: Use F9 grade filter bags instead and optimize pipeline layout
Inter level leakage
Detection feature: Temperature difference between inlet and outlet of the same level impeller>30 ℃
Leakage location:
Maze seal gap>0.4mm
Wear of partition lining
Maintenance points: Use carbon fiber sealing components to control assembly clearance of 0.2-0.3mm
3、 Abnormal operating conditions
Compression ratio too high
Dangerous working condition: Exhaust pressure exceeding 10% of rated value
Inducing factors:
? Sudden increase in backend system resistance
? Inlet temperature>40 ℃
Regulation method: Install an intake cooler and set up pressure interlock protection
Cooling system malfunction
Typical performance: Cooling water temperature difference<5 ℃
Troubleshooting:
? Scaling of the cooler (water side pressure difference>50kPa)
Insufficient flow rate of the water pump (below 60% of the design value)
Process: Clean the cooling pipes chemically every year and replace the high flow water pump
4、 Systematic solution
Suggest establishing a three-level prevention and control system:
Real time monitoring: Install vibration+temperature+pressure online monitoring system
Preventive maintenance: Conduct infrared thermal imaging testing every quarter
Intelligent regulation: Installing a frequency converter to control flow (saving 15-30% energy)
A case study of a cement plant shows that by optimizing the sealing structure and frequency conversion transformation, the outlet temperature of the blower was reduced from 135 ℃ to 92 ℃, and the annual maintenance cost was reduced by 40%. When the temperature continues to exceed the standard, it is necessary to shut down for a comprehensive inspection to avoid catastrophic failure.
