Oil gas treatment system and treatment method

Abstract

The invention discloses an oil gas treatment system and a treatment method, and the system comprises a condensation device which is used for carrying out condensation on collected oil gas, so as to obtain condensed liquid and non-condensable gas; a membrane separation assembly which is connected with the condensation device to receive the non-condensable gas, and is used for membrane separation treatment on the non-condensable gas to obtain intercepted oil gas and permeated oil gas with the organic matter concentration larger than that of the intercepted oil gas, wherein the permeated oil gasflows back to the condensation device; and an oxidation reaction device which is connected with the membrane separation assembly so as to receive the intercepted oil gas, and is used for performing oxidation reaction treatment on the intercepted oil gas so as to generate clean gas which can be discharged after reaching the standard. The oil gas treatment system can effectively solve the technicalproblems of strong dependence on the absorbent, substandard exhaust gas and high safety risk in the traditional oil gas treatment method.

Description

technical field [0001] The invention relates to the technical field of oil and gas recovery, and more specifically, to an oil and gas treatment system and treatment method. Background technique [0002] Because oil products contain a large amount of light hydrocarbon components, they are highly volatile, and will volatilize oil and gas during storage and transfer. The volatilization of oil and gas not only causes a large loss of oil products, but also pollutes the environment. Therefore, it is necessary to treat the volatilized oil and gas. Specifically, traditional methods such as adsorption, condensation, absorption, membrane separation and oxidation reaction can be used to recover oil and gas. . [0003] As the emission standards for volatile organic compounds (VOCs) become stricter, the VOCs content in the exhaust gas cannot meet the requirements of VOCs emissions after adsorption, condensation, absorption, membrane separation and oxidation reactions are used alone in c...

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Problems solved by technology

However, for warehousing companies, since they are generally oil product temporary storage and transfer organizations and have no ownership over oil products and chemicals, they cannot provide absorbents required for conventional combined processes such as adsorption-absorption, absorption-membrane separation, etc. , so that the combined process combined with the absorption process cannot be used; if the three-stage condensation process or the condensation-adsorption combined process is adopted, the process stability is poor and the gas discharged after oil and gas treatment cannot meet the current non-methane total hydrocarbons less than 120mg in most areas. / m 3 Even 80mg / m 3 It needs to be further combined with the oxidation process to meet the more stringent environmental protection emission indicators. The oxidation process is generally a catalytic oxidation treatment process (Catalytic Oxidizer, CO for short) carried out in a high temperature environment

[0004] The combination of the above-mentioned condensation process and the catalytic oxidation treatment process can make the exhaust gas meet a relatively strict environmental protection emission index, but if the condensation temperature of the heat exchanger used in the condensation process is lower than the freezing point of the oil and gas, the oil and gas will easily frost and block the exchange. heater

If the dual heat exchanger switching mode is adopted, temperature fluctuations of 8-15 °C will occur during the switching process of the dual heat exchangers, resulting in excessive fluctuations in the concentration of oil and gas at the outlet of the condensing equipment, which will seriously affect the operation stability of the rear-end catalytic oxidation and security

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