Daily basic inspection (mandatory)

Parameter monitoring: Check the operating parameters of the system, including vacuum degree (normal range -0.08~-0.095MPa), heating temperature (30-60 ℃), inlet and outlet water flow rate, and concentration of concentrated solution. If the parameters are abnormal, they need to be adjusted in a timely manner (such as insufficient vacuum degree, which may be due to seal leakage).

Equipment status inspection: Observe the operating sound of the vacuum pump, feed pump, and circulation pump, without any abnormal noise or severe vibration; Check for any dripping at the connection of the pipeline (especially in the acid-base pipeline); Check if the cooling water in the condenser is unobstructed to avoid a decrease in condensation efficiency due to water interruption.

Water quality sampling: Regularly sample and test the quality of condensate water. If COD and salt content increase, it is necessary to check whether the evaporator heat exchange tube is damaged or whether the pre-treatment filtration is ineffective.

Regular weekly maintenance

Filter cleaning: Disassemble the filter bags/cores of precision filters and bag filters, backwash or replace them with clean water to prevent suspended solids from clogging and causing poor feeding.

Vacuum pump maintenance: Check the oil level and quality of the vacuum pump. The oil level should be between the scale lines. If the oil quality is cloudy, replace the vacuum pump special oil in a timely manner; Clean the air inlet filter of the vacuum pump to prevent dust from entering the pump body.

Pipeline dredging: Rinse easily clogged pipelines (such as concentrated liquid discharge pipes) with clean water to prevent salt crystallization from blocking the pipelines.

Monthly in-depth maintenance

Online cleaning and descaling: Start the CIP online cleaning system that comes with the equipment, and use citric acid solution (5% to 8% concentration) to circulate and clean the evaporator heat exchange tubes and condenser to remove scaling on the tube walls; If the scaling is severe, it can be alternately cleaned with a weak alkaline solution, and after cleaning, rinse off any residual chemicals with clean water.

Seal inspection: Check the sealing rings at the shaft seal and flange connection of the vacuum pump. If aging or cracking occurs, replace them in a timely manner to prevent a decrease in vacuum degree.

Electrical system inspection: Clean the dust in the control cabinet, check for loose or aged wiring connections, and ensure that the motor and sensors are operating normally.

Quarterly/Annual Maintenance (Professional Item)

Material testing: Conduct corrosion testing on core components such as evaporators and condenser tubes (especially equipment used for treating acidic and alkaline wastewater). If local corrosion thinning is found, repair or replace it in a timely manner (preferably using 316L stainless steel or titanium alloy components).

Heat exchanger performance test: Check the heat transfer efficiency. If the heat transfer effect decreases by more than 30%, the heat exchanger needs to be disassembled and cleaned or the heat exchange tubes need to be replaced.

Comprehensive calibration: Contact the manufacturer to calibrate instruments such as vacuum gauges, temperature sensors, and flow meters to ensure accurate parameters.

Maintenance precautions

When dealing with highly corrosive wastewater, it is prohibited to use carbon steel tools in contact with equipment to avoid accelerated corrosion.

If the shutdown exceeds 3 days, it is necessary to drain the residual wastewater in the equipment, rinse the pipeline with clean water, and blow dry to prevent salt crystallization from adhering to the pipe wall.

During maintenance, it is necessary to cut off the power supply and hang a "under maintenance" warning sign to avoid accidental operation.