| 摘要 |
A closed loop contaminant control system for an evaporative water purification process at an oil recovery facility includes an evaporator having a water inlet, a distilled water discharge, and an oil and brine water discharge. A sump in the evaporator is divided by an oil skimming weir into a main sump and a blowdown sump, with the oil and brine water discharge located proximate the blowdown sump and the steam discharge located above the oil and brine discharge. A distillate tank receives distilled water from the evaporator and discharges the distilled water. The distillate tank has a level controller, other controllers provided for the system include a distilled water flow meter, a blowdown flow meter, a cycle controller, a total flow controller, a hardness controller, and a silica controller. |
| 主权项 |
1. A closed loop contaminant control system for an evaporative water purification process at an oil recovery facility, the system comprising:
an evaporator having a bottom, a water inlet, a distilled water discharge, a steam discharge, an oily water discharge and a brine water discharge, a sump provided at the bottom proximate said oily water discharge and said brine water discharge thereof, an oil skimming weir dividing the sump into a main sump and a blowdown sump, wherein said oily water discharge is located proximate said blowdown sump, and said steam discharge is located above the oil skimming weir; a wash tray adapted to wash the steam before it exits from said evaporator; and, a plurality of controllers comprising:
a distilled water flow meter located proximate the distilled water discharge of said evaporator,a blowdown flow meter measuring a flow from the blowdown sump leaving the evaporator,a cycle controller calculating a ratio between a distilled water flow and a blowdown flow,a total flow controller,a hardness controller for providing a set point of the cycle controller affecting the flow of a make-up water into said evaporator, and,a silica controller for providing a set point for an inlet pH controller utilizing a flow of caustic to adjust the pH. |
