The regular maintenance of the activated carbon adsorption cabinet should be carried out according to three fixed cycles: weekly, monthly, and quarterly. The replacement of the core consumable material – activated carbon – is based on an as-needed schedule (determined by combining the working conditions and detection data). The specific divisions are as follows:
Weekly maintenance
Mainly clean the exterior of the cabinet and clear the filter screen at the fan inlet. Wipe the dust and oil stains on the cabinet surface to prevent dust from entering the adsorption layer and affecting the adsorption efficiency.
Monthly maintenance
Open the maintenance door to inspect the interior. Check if the activated carbon layer is flat, whether there is any clumping, collapse or local voids. If there are any abnormalities, add the same specification of activated carbon in time.
Quarterly maintenance
First, test the performance of the equipment using a VOC detector to measure the concentration of the exhaust gas at the outlet, to determine if the activated carbon is approaching saturation. Second, maintain the components by adding lubricating oil to the fan bearings, adjusting the tension of the belt, calibrating the temperature sensor and differential pressure gauge. Third, check the equipment’s sealing and anti-corrosion conditions.
As-needed replacement cycle for activated carbon
Under normal working conditions, the service life of honeycomb activated carbon is 6–12 months, and that of granular activated carbon is 3–6 months. If the inlet and outlet differential pressure exceeds the design value by 1.5 times, or if the outlet odor or VOC concentration approaches the emission standard, it is necessary to replace immediately.