Correct operation and meticulous maintenance not only keep packed towers operating efficiently, but also serve as the key to extending equipment service life and ensuring production safety. This article mainly introduces the daily operation and maintenance specifications for packed tower equipment.
1. Standardized Operation — The Foundation of Stable Performance
The start-up and shutdown of packed towers seem straightforward, yet they follow strict technical principles.
During start-up, follow the principle of liquid first, gas later: introduce liquid into the tower first to fully wet the packing, then slowly feed gas. This prevents high-speed gas flow from directly impacting dry packing surfaces, which may cause packing damage or uneven liquid distribution.
For shutdown, reverse the sequence: gas first, liquid later. Cut off the heat source and gas inlet first, reduce the internal vapor load, and then stop liquid feeding to avoid kettle overflow.
The core of normal operation lies in stable working conditions. Packed towers are highly sensitive to fluctuations in gas and liquid loads. Operators shall maintain steady feed flow, reflux rate, heating capacity and cooling capacity. Severe load fluctuations will disrupt gas-liquid contact and sharply weaken separation efficiency.
Two key parameters require close attention during daily inspection:
1. Tower pressure drop: the pressure difference between the tower bottom and the top. A sudden rise indicates flooding or packing blockage; a sharp drop may signal liquid weeping or gas channeling.
2. Temperature measuring points, especially the sensitive plate temperature, which provides critical guidance for operational adjustment.
2. Identification and Solutions for Common Abnormalities
Minor faults are inevitable during long-term operation. Timely detection and proper handling can prevent minor issues from escalating into major failures.
Flooding is one of the most frequent malfunctions. It is characterized by a sharp surge in pressure drop, where downward liquid flow is blocked by rising gas. In severe cases, liquid rushes toward the tower top. It is generally caused by excessive gas or liquid load, or packing layer clogging. Once flooding occurs, reduce the operating load appropriately and monitor system recovery.
Uneven liquid distribution is a hidden threat to separation performance. Blocked or tilted liquid distributors create dry zones and over-wet zones within the packing layer, resulting in a sharp decline in separation efficiency. This problem requires detailed internal inspection and thorough cleaning of the distributor.
A slow and continuous rise in pressure drop is a typical warning sign of gradual packing fouling and blockage, caused by impurity deposition, polymer adhesion or crystalline sediment accumulation. In such cases, chemical cleaning or steam purging shall be arranged regularly to regenerate the packing.
Regular inspection of packing condition is essential:
· For random packing: check for breakage, deformation, compression and corrosion. Broken packing debris will block flow channels and increase resistance.
· For structured packing: inspect corrugated sheet deformation and loose dislocation between packing modules.
In addition, internal components including support grids and hold-down grids shall be checked for fastening tightness to prevent loosening and falling off under long-term gas scouring.
External maintenance of the tower shell should not be neglected. Damaged thermal insulation leads to heat loss and moisture penetration, accelerating outer wall corrosion. Any damage to anti-corrosion coatings or insulation layers must be repaired promptly for risk prevention.
The operation and maintenance of packed towers require careful observation of subtle operational changes and regular hazard inspection. Only through standardized management can packed towers maintain long-term stable operation, delivering reliable support for safe production and economic benefits of enterprises.
