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RPSEA Project 07122-12 TECHNICAL ASSESSMENT OF PRODUCED WATER TREATMENT TECHNOLOGIES 1st Edition Table 34. Summary of technical assessment of GE – evaporative produced water treatment using MVC evaporators. Criteria Description/Rationale Energy consumption The power consumption of MVC evaporator is 70 kWh/kgal of distillate produced (2.94 kWh/bbl) [129]. A typical produced water evaporator will consume 60-65 kWh/kgal of distillate. The higher consumption of the GE MVC evaporator is that the system was designed to have a crystallization device downstream and, therefore, the cycles of concentration are higher than would otherwise be required. The higher cycles of concentration increase the vapor compressor electrical consumption to overcome the associated increase in boiling point of the brine within the evaporator. Electrical consumption of less than 60 kWh/k gal can be achieved by modifying the evaporator configuration [129]. Chemicals Life cycle Scale inhibitor and acid may be required for process control to prevent scaling. Corrosion control is achieved via pH control. Annual cleaning is typically conducted using acid, EDTA, or other antiscalant. Expected 30 years. O&M considerations Levels of monitoring and control: required for feed pH, flow rates as well as steam and vessel pressures. High level of skilled labor required. MVC is a complex system and adds to the O&M skill level required. Level of flexibility: easy to adapt to highly varying water quality but not flexible for varying water flows. Level of robustness: high ability of the equipment to withstand harsh conditions. Level of reliable: typical plants operate continuously, with 99% on- stream availability. Types of energy required – electricity and gas. Overall costs Economic comparisons of produced water treatment approaches are site specific and detailed conclusions will vary. However, there is a consensus in the industry that the majority of new SAGD facilities will use evaporative treatment methods, with a minority continuing to utilize traditional methods. Pre-and post treatment Concentrate management or waste disposal Applicability in produced water treatment MVC requires minimal pretreatment such as de-oiling, pH adjustment, and deaeration. 2% brine needs deep well injection or crystallizer for ZLD, and generated solid solids need waste disposal. Excellent technology for produced water with high TDS and near ZLD disposal, more applicable to centralized system and large flow rate. Note: 1 barrel = 42 US gallons Back to the list of technologies 90PDF Image | TECHNICAL ASSESSMENT OF PRODUCED WATER TREATMENT TECHNOLOGIES
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