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Installation and Operation of Magnetic Stirring Reactors

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Installation and Operation of Magnetic Stirring Reactors

Principles of Operation

The reactor utilizes magnetic attraction/repulsion to rotate the stirrer, while the heating system—via a temperature control panel—maintains precise thermal conditions. This non-contact stirring minimizes contamination risks, making it ideal for sensitive experiments.

Step-by-Step Installation Guide

  1. Transport & Positioning:
    • Avoid impact to the magnetic stirrer on the reactor cover during handling.
    • Ensure the installation site is level and vibration-free.
  2. Environmental Requirements:
    • Operate in a well-ventilated area compliant with explosion-proof standards.
    • Maintain ambient temperature between 10–30°C for optimal performance.
  3. Seal Selection:
    • Choose gaskets matching the reaction medium, design pressure (e.g., 1–10 bar), and temperature (-20–200°C).
    • Common materials: PTFE for corrosive media, metal spiral wound gaskets for high pressure.
  4. Reducer Lubrication:
    • Fill the reducer oil tank with No.13 compressor oil or No.11 cylinder oil.
    • Maintain oil level at the marked line; replace oil every 6 months or 1,000 operating hours.
  5. Cooling System Setup:
    • Connect the magnetic stirrer's cooling jacket to a separate water source (inlet at the bottom, outlet at the top).
    • Ensure cooling water does not flow through the reactor's internal cooling coil into the stirrer jacket.
    • Maintain water pressure at 0.1–0.3 MPa and temperature ≤25°C.
  6. Electrical System Placement:
    • Locate the control cabinet and variable frequency drive in a dry, ventilated electrical room.
    • Ensure grounding resistance <4Ω for safety.
  7. Valve Operation:
    • Close valves gently to prevent damage to sealing surfaces.
    • Use needle valves for precise flow control; avoid sudden opening/closing of ball valves.

Operational Best Practices

  1. Pre-Startup Checks:
    • Verify gasket tightness and stirrer rotation (manually turn the shaft to check for obstructions).
    • Confirm cooling water flow and electrical connections.
  2. Startup Sequence:
    • Activate the cooling system first, then power on the reactor.
    • Gradually increase stirring speed (start at 50 RPM, then adjust to target speed ≤1,500 RPM).
    • For heating, set temperature in 10°C increments to avoid thermal shock.
  3. Running Monitoring:
    • Track pressure (should not exceed design pressure), temperature (±2°C accuracy), and stirrer noise.
    • Record operational data every 30 minutes for traceability.
  4. Shutdown Procedures:
    • Stop heating and allow the reactor to cool to ≤50°C before reducing stirring speed to zero.
    • Turn off the cooling system last to prevent condensation.

Maintenance Tips

  • Bearing & Bush Replacement:
    Replace immediately if unusual friction or vibration occurs (indicative of excessive wear clearance).
  • Periodic Inspections:
    • Monthly: Check gasket condition and lubricant quality.
    • Quarterly: Calibrate temperature/pressure sensors.
    • Annually: Perform pressure testing (1.25x design pressure for 30 minutes).

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