Approximate inspection scope and methods of stainless steel reactor equipment

### Precautions for Using a Thermal Oil Furnace with a Stainless Steel Reactor

#### **After Shutdown:**

1. **Shutdown Duration:**

- For shutdowns exceeding 8 hours, use the hand-fired grate.

- Thicker, wet coal should be used to suppress the flame after closing the fan and flue damper.

- Assign someone to monitor the furnace to prevent the flame from extinguishing.

2. **Managing Coal Layers:**

- For chain grates, thicken the coal layer (800–1200 mm below the grate) after shutting down the blower and induced draft fans.

- In winter, when the furnace cools rapidly, temporarily activate the blower and induced draft to reignite the coal before adding new coal.

3. **Circulation Pump:**

- Keep the circulation pump running during shutdown.

- Bypass the pump when the heating equipment is not in use.

- Shut down the pump if the outlet oil temperature drops below 100°C.

4. **Reactivation:**

- Before restarting, start the circulation pump to ensure the heat transfer fluid flows properly.

- Control the heating rate to avoid local overheating, especially if the oil temperature has dropped below 100°C.

#### **Temperature Control Device:**

- **Components:**

- A solenoid valve connected to the heat source pipe.

- A temperature sensor inside the reactor.

- Cooling water pipes with spray holes and a circular cooling pipe connected to tap water or backup water via a solenoid valve.

- A water receiving tube at the reactor's bottom, with a temperature sensor and water outlet pipe.

- **Advantages:**

- Automates temperature control, reducing manual labor.

- Simple, cost-effective, and easy to operate.

#### **Inspection of Stainless Steel Reactors:**

1. **Scope of Inspection:**

- Includes design review, operational quality, installation quality, repair quality, and operational safety checks.

2. **Types of Inspections:**

- **Design Document Review:** Ensures compliance with specifications.

- **Physical Inspections:** Conducted on-site or abroad for import/export vessels.

3. **Inspection Items:**

- Pressure vessel design and operational quality.

- Installation and repair quality.

- Safety checks for all components affecting operation.

By following these precautions, the thermal oil furnace and stainless steel reactor can operate safely and efficiently, ensuring long-term reliability and performance.