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.