Device and method for recovering oil gas by condensation-adsorption combined technology

Abstract

The invention relates to a device and a method for recovering oil gas by adopting a condensation-adsorption combined technology. The whole technical proposal is characterized in that a mixed gas of various oil gases and air generated during various storage and transportation processes enters a condensing unit with an integrative structure which consists of an evaporator, a compressor, a condenser and an oil water separator through a gas collecting tube; when being condensed to the temperature of about minus 5-5 DEG C, most of components over C5 are condensed and liquefied, and are delivered to a storage tank through a valve and an oil return pipe, or used directly; the rest small part of oil gas mixture passes through the valve and is delivered to an adsorption system by a vacuum pump P1 for further adsorption treatment; after being adsorbed and analyzed alternately by an adsorber A and an adsorber B, stripping gas containing oil gas is delivered to the storage tank by a vacuum pump 2 and the valve, or used directly; the effluent gas with the oil gas approximate to zero enters the atmosphere through an emptying pipe; the sorbent used by the two adsorbers is a phi3 cylindrical-shaped active carbon which is specially researched and used for the recovery of oil gas, and carry out vacuum desorption alternately under the action of the vacuum pump p2; and the desorption time is set to 15-20 minutes. The recovery rate of oil gas by utilizing the device and the method can reach over 98 percent, and the device and the method have the advantages of low cost and being beneficial to environmental protection.

Description

technical field [0001] The invention relates to an oil and gas recovery and treatment system in the technical field of environmental protection and energy saving, in particular to an oil and gas recovery device and method for combined processes of adsorption and shallow cooling. Background technique [0002] As a large amount of oil and gas in gas stations, refineries and other places evaporates and is directly discharged into the atmosphere, it not only causes serious loss in quantity and quality, but also seriously pollutes the atmospheric environment, thereby endangering human health, leaving a significant fire hazard. Therefore, the country has formulated a standard (GB20950-2007) to enforce the installation of oil and gas recovery devices in oil storage (including refineries), and determined the area, time limit and emission limit value. [0003] At present, people have developed a variety of oil and gas recovery technology solutions, such as absorption method, adsorpt...

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Problems solved by technology

[0008] The technical problem to be solved by the present invention is: for the shortcomings of the existing single adsorption process, such as long adsorption time and small processing capacity, and the defects of large energy consumption and substandard oil and gas discharge of the single condensation process

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