Waste gas recovery by condensation method

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The process of oil and vapor recovery by condensation involves organic compounds in waste gases, which are mixtures of hydrocarbons and non-hydrocarbons with varying molecular sizes and chemical structures. The principle behind this oil and vapor recovery technique is to induce a phase change in the oil vapors through methods such as cooling and pressurization, thereby converting them from a gaseous state to a liquid state and thus enabling the recovery of oil and vapor. Therefore, the technical principle behind treating oil and gas using the condensation method is the same as that used in crude oil processing, and it is the most suitable approach considering the thermophysical properties and migration characteristics of oil and gas. When the condensation temperature was reduced to –110°C, all three types of oil and gas, after treatment, met the requirements specified in the standards: a recovery rate of over 95% and exhaust gas concentrations below 25 mg/L ； When the condensation temperature drops to –120°C, the exhaust gas contains virtually no oil vapor. Condensation and recovery process 1) First stage: Pre-cooling. Before entering the high-temperature heat exchanger h1, the oil-gas mixture is first processed in a pre-cooling unit, where its temperature is reduced to around 4°C, thereby removing most of the water vapor from the feed gas ； 2) Second stage: mild cooling – the oil and gas enter heat exchanger H1, where they release heat and their temperature is reduced to –30––40°C; high-carbon hydrocarbons such as C6 are recovered from the oil and gas ； 3) Third stage: Cryogenic cooling – the oil and gas enter the medium-temperature heat exchanger h2, where the temperature is reduced to –70––80°C; C5 and most of the C4 components are condensed ； 4) Fourth stage: The oil and gas enter the low-temperature heat exchanger h3, where the temperature drops to the range of –105 to –110°C. All carbon in high-carbon hydrocarbons such as C4 condenses, leaving only small amounts of components with carbon numbers lower than C3 in the exhaust gas. The main feature is that the condensation process is simple and direct; no secondary treatment is required, and the recovered product is liquid gasoline. Oil and gas recovery technologies such as adsorption, absorption, and membrane separation methods all require a secondary spray absorption process to treat the concentrated oil and gas, or a condensation process to recover liquid hydrocarbons. These processes are complex, involve significant maintenance requirements, and have high energy consumption. For specific inquiries, please contact Beijing Gaojie Energy Technology Co., Ltd