The invention discloses a low-temperature adsorption and high-temperature
desorption efficient oil gas
recovery method, and relates to an oil gas
recovery method.
Raw material oil gas is introduced into a primary
cooling tower, a
refrigerant in a
heat pump system is used for evaporating and refrigerating in an
evaporator in the
tower to cool the
raw material oil gas, part of heavy components and
water vapor in the oil gas are condensed and separated, condensate generated by cooling enters an absorption
system, and cooled low-temperature oil gas enters an adsorption unit. The adsorption unit is provided with at least three towers, two towers are connected in series for adsorption, the other
tower is used for
desorption and regeneration, and the three towers are alternately switched through valve control in the adsorption and
desorption processes to circularly treat oil gas. The gas reaching the
emission standard after adsorption is discharged. Saturated oil gas is adsorbed by the adsorption
tower, heat obtained in the primary
cooling tower enters a heat exchange facility in the adsorption tower by the
heat pump system through
refrigerant circulation of the
heat pump system to heat an adsorption
bed layer, vacuum desorption is carried out, and desorbed oil gas is introduced into the absorption system. Low-temperature adsorption and high-temperature desorption are realized, the oil gas
recovery rate is high, the adsorbent regeneration efficiency is high, and the operation cost is low.