Precautions for starting up hydrogenation units in winter

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⑴ The system must be purged with nitrogen, and condensate must be drained from the glass level gauges and areas where liquid tends to accumulate at the lowest points to allow air to pass through. ⑵ All heat tracing lines must remain unobstructed. ⑶ Ensure that the cooling water line of the pump is unobstructed. ⑷ It is necessary to ensure that the lubricating oil in the pump is free from water condensation. ⑸ The air passage must remain unobstructed, and condensate at the bottom of the air tank should be drained to allow air to pass through. (6) The steam system must remain unobstructed. ⑺ All control and measuring instruments must be reliable and easy to use; during nitrogen purging, the instrument outlet pipes should also be drained to allow air to enter. ⑻ The water in the raw material tank must be completely removed before feeding in the material. ⑼ During nitrogen purging, it is essential to ensure that every pipeline is flushed, and gas should be visible at all exhaust points. ⑽ Before starting up, ensure that the emergency venting system is unobstructed. ⑾ Before lighting the heater, vent and drain the gas in front of the burner. ⑿ When using nitrogen for purging, also purge the pumps to ensure they remain unobstructed. ⒀ Before starting the pumps, rotate their shafts slowly to prevent the pump shafts from freezing and breaking. ⒁ During the initial heating and pressurization of the system, reduce the rate of temperature and pressure increase to avoid damage to the equipment caused by too rapid increases