How to troubleshoot the decrease in adsorption efficiency of solvent recovery equipment? Direct answer: Let's first look at the combination of two indicators - the increase in outlet concentration is accompanied by a decrease in recovery, which is mostly due to the saturation of adsorbent penetration; The continuous increase in pressure difference and the lag in concentration change are mostly caused by adsorbent pulverization or dust accumulation blockage. The disposal of the former involves regenerating or replacing the adsorbent, optimizing the adsorption cycle; The latter needs to first check if the preprocessing is ineffective before deciding whether to clean or replace the material. The direction of handling the two reasons is different. First distinguish and then take action, and do not blindly replace materials.
Penetration is when the adsorption capacity is exhausted: after the bed is saturated with adsorption, pollutants directly pass through the bed, the outlet concentration increases, and the recovery rate decreases. At this time, the pressure difference change is not significant. Powdering blockage is a narrowing of the physical channel: the adsorbent breaks down and accumulates powder, the incoming dust clumps at the top of the bed, the airflow cannot pass through, the pressure difference increases, and the adsorption capacity is underutilized. The combination signal judged on site: the increase in outlet concentration and the level of pressure difference indicate penetration; Sudden increase in pressure difference and subsequent increase in concentration indicate blockage. The sudden surge in pressure difference is most likely due to the failure of pre dust removal or filtration, causing dust to drive straight in.
After confirming penetration, check if the nuclear adsorption cycle is too long and if the regeneration is complete. The common reason for incomplete regeneration is insufficient desorption steam temperature or flow rate - low steam temperature, incomplete desorption of residues in the carbon pores, and capacity accumulation decay after several cycles. After adjusting the regeneration parameters, observe a complete cycle. If the outlet concentration drops normally, it indicates that the regeneration problem has been solved; For those still climbing, take samples and send them for iodine value or CTC testing. Replace the entire batch if the indicators decay to the limit. Fill the container evenly and tightly when replacing, thoroughly clean the container after removing old materials, and mixing old and new materials will cause the new materials to be wasted.
The root cause of blockage often lies in pre-treatment: whether the filter is replaced on schedule, whether the defogger is malfunctioning, and whether the intake is contaminated with liquid and dust. Pre treat first, then treat the bed layer - replace the material without pre-treatment, and the new material will quickly become clogged again. If the bed layer difference exceeds the design upper limit, stop the machine for cleaning or replace the adsorbent, and check whether the bed support grid plate is deformed and leaking materials. Daily monitoring should list the pressure difference as a trend item, record the initial pressure difference, and arrange for disposal when it reaches one and a half to two times the initial value. Don't wait until the fan can't be dragged to handle it.
| Signal combination | point to | First check |
|---|---|---|
| Export concentration increases and pressure difference remains stable | Penetration saturation | Regeneration parameters and adsorption cycle |
| Sudden increase in pressure difference | Powdering or dust accumulation | Preprocessing filter |
| Both deteriorate simultaneously | End of Life | Sampling and testing indicators |
| Suddenly exceeding the standard | Sudden change in intake | Upstream operating conditions and components |
The decrease in adsorption efficiency is rarely a single point of failure, but mostly the result of the combination of pretreatment, regeneration, and lifespan. By collecting trend data, the state of the device becomes an understandable curve, rather than a guess after each alarm.
Judging from the material and regeneration process, there is a loss during each hot regeneration process. Generally, after three to five cycles, the indicators decay to the limit and need to be replaced. The test data shall prevail.
I need it. High pressure difference indicates an increase in fan power consumption and a risk of bed blockage. Clean according to the trend and do not wait for the concentration to deteriorate.
If the loading is normal and the regeneration is in place, it can pass the data verification in one cycle. If it still does not meet the standard, check other aspects of the system.
This article by LuoyangWohong PetrochemicalEquipment Co., Ltd. arranges that the company provides design, manufacturing and operation and maintenance services for condensation recovery, membrane separation recovery and complete solvent recovery devices for chemical and pharmaceutical enterprises. If you need process evaluation or scheme configuration, please contact and exchange.
Mr. Li 13526990215
Hotline
