Absorption method for refrigeration oil using self-produced stabile lighter hydrocarbons as absorber
A technology for stabilizing light hydrocarbons and absorbents, which is applied in the recovery of liquid hydrocarbon mixtures and the petroleum industry. It can solve problems such as increased equipment investment, large absorption dose, and complicated processes, and achieves reduced solvent circulation, increased C3 yield, and improved process flow. simplified effect
Inactive Publication Date: 2011-04-20
XIAN CHANGQING TECH ENG
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Problems solved by technology
[0002] As far as is known, most of the absorbents used to recover light hydrocarbons from oilfield associated gas or natural gas by refrigeration oil absorption method are gasoline or naphtha, which are continuously diluted by absorbed light hydrocarbons during the absorption process. The composition of the agent is constantly changing. If it is to be kept stable, the light components need to be cut out, which increases the equipment investment, the process is complex, the absorbed dose is also large, and the energy consumption during regeneration is high.
Another process is to use the deethanizer top gas as an absorbent after heat exchange and freezing. This method requires low-temperature steel and high energy consumption
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[0015] The raw material gas 1, which is rich in liquefied gas components and pressurized to 1.8-2.0MPa, enters the poor-rich liquid heat exchanger 4 after dehydration, and the dry gas 2 after recovering the liquefied gas and the liquid hydrocarbon at the bottom of the liquid separation tank 6 After heat exchange, it enters the rich gas evaporator 7, and is further cooled to -30°C by propane 8, and the frozen gas-liquid mixture enters the liquid separation tank 6. The natural gas from the top is throttled to 1.7MPa by the throttle valve 5 and enters the absorption section of the deethanizer 9; the absorbent 22 frozen to -30°C is poured into the top of the absorption section, and the liquefied gas components are absorbed in the absorption section . The mixed light hydrocarbons at the bottom of the liquid separation tank 6 are throttled by the throttle valve 5 and the pressure drops to 1.75 MPa, and enter the middle part of the deethanizer 9 after entering the lean-rich gas heat ...
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The invention relates to an absorptionsverfahren of refrigeration oil which produces natural gasoline as absorbent, which is characterized in that virgin gas (1) enters a heat exchanger of lean and pregnant solution (4) after dehydration and enters a liquid separator (6) after being cooled; natural gas at the top of the liquid separator (6) enters a deethanizing column (9); the mixed light hydrocarbon at the bottom of the liquid separator (6) enters the heat exchanger of lean and pregnant solution (4) and then enters the middle part of the deethanizing column (9); the liquid hydrocarbon at the bottom of the deethanizing column (9) removes ethane through a reboiler (10) and enters the middle part of a debutanizing column (14). Liquefied gas is carried over in a debutanization reboiler (13) and enters a reflux accumulator (17) through a cooler (11), and is pumped to the column top by a reflux pump (15) and some are liquefied gas finished products; one way of the stable light oil at thebottom of the debutanizing column becomes product oil through the cooler (11); the other way thereof enters a propane evaporator (18) and enters a low-temperature liquid separator (19) after refrigeration; the part at the bottom of the low-temperature liquid separator (19) is pumped to the top of the deethanizing column (9) by a saturated absorbent pump (20) so as to finish a circulation. The invention has advanced technique and simple equipment.
Description
technical field [0001] The invention relates to an absorption method of refrigerated oil, in particular to an absorption method of refrigerated oil using self-produced stable light hydrocarbons as absorbents. Background technique [0002] As far as is known, most of the absorbents used to recover light hydrocarbons from oilfield associated gas or natural gas by refrigeration oil absorption method are gasoline or naphtha, which are continuously diluted by absorbed light hydrocarbons during the absorption process. The composition of the agent is constantly changing. If it is to be kept stable, the light components need to be cut out, which increases the equipment investment, the process is complex, the absorbed dose is also large, and the energy consumption during regeneration is high. Another process is to use the deethanizer top gas as an absorbent after heat exchange and freezing. This method requires low-temperature steel and high energy consumption. [0003] For this rea...
Claims
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IPC IPC(8): C10G5/04
Inventor 徐伟白俊生李士富
Owner XIAN CHANGQING TECH ENG