1. Faults/wear and tear prone to occur during long-term use

Scaling and blockage of evaporation chamber/heat exchange tubes. Salts, calcium and magnesium ions, or organic matter in the wastewater will precipitate out during the evaporation process and adhere to the inner walls of the heat exchange tubes and the bottom of the evaporation chamber. This can lead to a decrease in heat transfer efficiency, an increase in equipment energy consumption, and in severe cases, blockage of the pipeline, forcing the equipment to shut down.

If the core components are corroded and damaged when handling acidic or alkaline wastewater, long-term exposure can cause corrosion to metal parts such as the evaporation chamber, condenser tubes, and pump body. Common manifestations include rust and holes on the component surface, and even leakage of cooling liquid or wastewater.

The vacuum pump, which is crucial for maintaining negative pressure in the system, may experience a decline in efficiency or even damage. After prolonged operation, the seals inside the pump are prone to aging, or the intake of trace amounts of wastewater vapor may cause wear and tear on internal components, resulting in insufficient vacuum and directly affecting evaporation efficiency.

Valve/seal aging and leakage: Valves such as stop valves and check valves in the system, their sealing rings and gaskets will age due to long-term pressure and heat. This can lead to negative pressure leakage or coolant leakage, disrupting the stability of system operation.

Sensor/Control System Malfunction: Sensors such as temperature, liquid level, and vacuum sensors are prone to data drift and malfunction when exposed to humid or corrosive environments for extended periods. If the control system receives incorrect signals, it may lead to misoperation of the equipment, posing safety hazards.

II. Components that require special attention in daily maintenance

Heat exchanger tube (core heat transfer component of evaporator)

Regularly (such as weekly) check the temperature uniformity of the outer wall of the heat exchange tube to determine if there is scaling.

Conduct chemical cleaning (such as using citric acid to remove calcium and magnesium scale) or physical cleaning (such as high-pressure water flushing) every 1-3 months based on the composition of the wastewater, to prevent scale buildup.

Vacuum pump (key to maintaining negative pressure)

Check the oil level and quality of the vacuum pump daily. If the oil is turbid or emulsified, replace it with dedicated vacuum pump oil in a timely manner.

Check the pump body seals monthly. If there is a decrease in vacuum degree (such as abnormal readings on the negative pressure gauge), it is necessary to check whether the seals are aging and replace them if necessary.

Valve and sealing components

Conduct weekly inspections to check the flexibility of all valve switches, and observe whether there are any signs of leakage at flange connections and valve packings.

Replace the sealing rings and gaskets of key valves every six months, preferably using corrosion-resistant materials (such as fluororubber).

Evaporation chamber and concentrated solution discharge pump

After draining the concentrated solution every week, flush the bottom of the evaporation chamber to avoid the deposition of residual salts or organics.

Check the operating noise and vibration of the concentrated solution discharge pump monthly. If there is any abnormal noise, disassemble it to check whether the impeller is worn or blocked.

Sensor and control system

Calibrate the data of temperature and vacuum sensors daily to ensure consistency with actual operating conditions.

Clean the sensor probe every 3 months to prevent contaminants from adhering and affecting detection accuracy; if frequent data drift is observed, replace the sensor promptly.