Shutdown time of thermal oil furnace for stainless steel reactor

### Shutdown and Maintenance of Stainless Steel Reactor Thermal Oil Furnaces:

1. **Shutdown Procedure:**

- For shutdowns exceeding 8 hours, close the manual grate due to the small furnace chamber.

- Turn off the fan and flue damper, then suppress the red flame using thick, wet coal.

- Assign someone to monitor the furnace during the shutdown to prevent the flame from extinguishing. If wet coal spontaneously combusts, reapply fresh wet coal.

- For chain grates, after shutting off the drum and induced draft fan, place a thick coal layer (800–1200 mm) on the grate.

- In winter, if rapid cooling occurs, temporarily increase the blower and draft to ignite the coal before adding new coal. Ensure the fire is not interrupted.

2. **Circulation Pump Operation:**

- Keep the circulation pump running during shutdown. Bypass the pump when the heating equipment is not in use.

- Stop the pump when the outlet oil temperature drops below 100°C.

3. **Reactivation After Shutdown:**

- Start the circulation pump for the organic heat transfer furnace before reigniting the combustion system.

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

### Mechanical Seal Installation for Stainless Steel Reactors:

1. Inspect the reactor seal for scratches or marks on the dynamic and static rings.

2. Clean the O-ring and surfaces of the dynamic and static rings with a soft cloth, then apply a small amount of lubricating oil suitable for the reactor medium.

3. Check the levelness of the static ring and the verticality of the stirring shaft using a level and micrometer, adjusting them to meet specified requirements.

4. Install and secure the mechanical seal base and fixed ring, ensuring the spring applies even pressure to the dynamic and static rings.

5. If a balance tank is present, connect the sealing liquid inlet and outlet pipes, nitrogen bottle, pressure reducer, and balance tank pipes. Perform a static pressure test before connecting the water jacket for cooling.

6. For medium temperatures below 80°C, use oil with high heat of vaporization, minimal impurities, and good lubrication properties for cooling. For temperatures above 80°C, use circulating water for cooling the bottom water jacket and tank.

### Inspection of Stainless Steel Reactors:

1. **Scope of Inspection:**

- Review design documents and conduct physical inspections.

- Inspect operational quality, installation quality, and repair quality of pressure vessels.

2. **Inspection Methods:**

- Perform on-site inspections for export equipment and production supervision for imports.

- Ensure all inspection items related to the safe operation of the reactor are thoroughly covered.