METHOD OF HEAT RECOVERY OF WASTE PROCESS FLUIDS Russian patent published in 2019 - IPC C10M175/00 B01D53/00 B01D1/22 

FIELD: oil and gas industry.

SUBSTANCE: invention relates to petrochemical and gas industry, in particular to methods of separation and purification of waste process fluids, such as glycols, motor, turbine and transformer oils. Method of thermal regeneration of waste process fluids involves feeding liquid into the upper part of the film evaporator. Flue gases from the burner are fed into the annular space of the evaporator. Fluid flows in form of film along inner surface of evaporator into bottom part of evaporator, where there are also vapors and unevaporated liquid residues. Bottom liquid is mixed with bottom-hole liquid of reinforcing column, in which heavy components are condensed due to interaction with distillate flowing from nozzle of reinforcing column. Distillate is supplied by irrigation into upper part of reinforcing column. Distillate is obtained from non-condensed vapors by cooling in a cooler, from where it is supplied into a distillate collecting tank. Distillate is also directed into the upper part of the film evaporator for its repeated purification. Heavy components distillates are extracted from bottom part of film evaporator and bottom part of reinforcing column. After mixing of heavy products of bottom part of film evaporator in pipeline and column reinforcing flow is separated. Most part of obtained flow of heavy products is supplied by pump for mixing with waste liquid supplied for regeneration, and then mixture is supplied to upper part of film evaporator, providing internal circulation of heavy products. Smaller portion of the flow, which is a balance excess of heavy products, is removed from the system. Vacuum pump creates negative pressure in container with distillate.

EFFECT: invention provides low pressure in the regeneration unit in range of 1_6–30 kPa, reduces the process temperature to 200–350 °C and prevent temperature decomposition of cleaned liquids.

1 cl, 1 dwg