Technology Breakdown | Pressure Coalescing Oil Separator: Four-Stage Units + Triple Technologies + PLC Automation — A Full-Process Guide to Circulating-Water Deoiling
I. System Composition: Four-Stage Treatment Units
The entire system is organized according tothe four-stage sequence of 'influent pretreatment → coalescing separation → oily-waste recovery → backwashing.' Influent pretreatment intercepts large particulate impurities and stabilizes feed conditions; coalescing separation is the core deoiling unit; oily-waste recovery collects the separated oil for resource reuse; backwashing ensures long-term high-efficiency packing operation. The four stages link into a complete closed loop.
II. Core Technology Route: Triple-Technology Integration
First, cyclonic centrifugal pre-separation. Using the centrifugal force of the swirl field, free oil and large dispersed oil droplets are rapidly separated before entering the main treatment section, greatly reducing the subsequent coalescing load and improving overall shock-load resistance.
Second, coalescence by coalescing media. This is the soul of the entire process. Oily wastewater passes through a patented packing bed; the specific surface area of the packing is no less than350 m²/m³, providing ample collision surface for oil droplets. Micron-scale oil droplets are wetted, collide, and coalesce on the packing surface, gradually growing into millimeter-scale large droplets — after a three-order-of-magnitude increase in size, the rise velocity increases exponentially.
Third, shallow-pool separation. The coalesced large droplets enter a shallow pool and rapidly float to the surface relying on the oil–water density difference, achieving oil–water separation with very low oil content in the effluent.
III. Automation and Monitoring:PLC Guards the Entire Process
The system runs fully enclosed and automated throughout;the PLC control system monitors key parameters such as pressure, flow, and the oil–water interface in real time. Any abnormality triggers an automatic alarm, allowing operators to grasp equipment status remotely without frequent on-site inspections, significantly reducing O&M workload.
IV. Performance Indicators at a Glance
Indicator | Parameter |
Treatment Principle | Pure physical separation, no chemicals required |
Core Technology | Cyclonic centrifugal pre-separation+ coalescing media + shallow-pool separation |
Specific surface area of patented packing | ≥350 m²/m³ |
Oil droplet coalescence scale | Micron-scale→ millimeter-scale, rise separation |
Influent oil content | ≤10000 mg/L |
Effluent oil content | ≤25 mg/L |
Removal rate | >99% |
System composition | Influent pretreatment+ coalescing separation + oily-waste recovery + backwashing |
Automation | PLC real-time monitoring, automatic alarm on abnormality |
V. vs. Conventional Filtration: Why the Coalescing Route Is Superior
Comparison Dimension | Conventional Filtration | Pressure Coalescing Oil Separator |
Deoiling Mechanism | Interception (physical screening) | Coalescence & amplification+ density-difference flotation |
Emulsified Oil Treatment | Poor | Micron-scale droplets can be coalesced and removed |
Resistance to high-concentration shock | Filter media easily fail | Cyclonic pre-separation buffers, strong shock resistance |
Backwash Frequency | High | Low, long cycle |
Chemicals | Some processes require dosing | Zero chemicals |
Automation Level | Low | Fully automatic PLC, abnormal alarm |
Effluent Stability | Large fluctuation | Stable≤25mg/L |
Summary: The Pressure Coalescing Oil Separator, throughthe combination of 'four-stage units to secure the process, triple technologies to secure the effect, and PLC to secure operation,' provides refineries with a complete, stable, and green technical solution for cooling circulating-water deoiling. For refineries pursuing long-cycle operation and green production, it deserves close attention.
