油氣回收設(shè)備是用于收集、處理在油氣儲存、運輸、加注過程中揮發(fā)的油氣混合物的環(huán)保裝置，其核心原理是通過物理或化學方法減少油氣向大氣排放，既降低能源浪費，又避免環(huán)境污染。這類設(shè)備廣泛應(yīng)用于加油站、儲油庫、油罐車等場景，通過分級處理實現(xiàn)油氣的高效回收與再利用，其技術(shù)邏輯圍繞 “捕集 - 分離 - 回收” 三個核心環(huán)節(jié)展開，各環(huán)節(jié)的協(xié)同運作決定了設(shè)備的回收效率與環(huán)保效果。

　　Oil and gas recovery equipment is an environmentally friendly device used to collect and process volatile oil and gas mixtures during oil and gas storage, transportation, and refueling. Its core principle is to reduce oil and gas emissions into the atmosphere through physical or chemical methods, which not only reduces energy waste but also avoids environmental pollution. This type of equipment is widely used in gas stations, oil storage tanks, tank trucks and other scenarios, achieving efficient recovery and reuse of oil and gas through graded processing. Its technical logic revolves around the three core links of "capture separation recovery", and the coordinated operation of each link determines the recovery efficiency and environmental protection effect of the equipment.

　　油氣捕集是設(shè)備運行的首要環(huán)節(jié)，核心是通過密封與負壓技術(shù)減少油氣逃逸。在加油站油罐車卸油時，油氣回收設(shè)備通過密閉鶴管與油罐車連接，形成封閉空間，避免卸油過程中油氣直接揮發(fā)到空氣中。同時，設(shè)備啟動負壓系統(tǒng)（通常采用真空泵），使油罐內(nèi)維持微負壓狀態(tài)（壓力控制在 - 50 至 - 150 帕），利用壓力差將揮發(fā)的油氣導入回收管道。對于加油機，加油槍配備同軸軟管，在加注汽油時，槍頭的密封罩緊貼車輛油箱口，將油箱內(nèi)被置換出的油氣通過回氣管路抽回油罐，形成 “加注 - 回收” 的閉環(huán)，這一過程可捕獲約 95% 以上的揮發(fā)油氣，避免傳統(tǒng)加油方式中油氣直接擴散的問題。

　　Oil and gas capture is the primary link in equipment operation, and the core is to reduce oil and gas escape through sealing and negative pressure technology. When unloading oil from a tanker at a gas station, the oil and gas recovery equipment is connected to the tanker through a closed crane pipe, forming a closed space to prevent oil and gas from directly evaporating into the air during the unloading process. At the same time, the equipment activates the negative pressure system (usually using a vacuum pump) to maintain a slight negative pressure inside the oil tank (pressure controlled at -50 to -150 Pa), and uses the pressure difference to introduce the volatile oil and gas into the recovery pipeline. For fuel dispensers, the refueling gun is equipped with a coaxial hose. When refueling, the sealing cover of the gun head is tightly attached to the vehicle's fuel tank port, and the displaced oil and gas in the tank are pumped back to the tank through the return pipeline, forming a "refueling recovery" loop. This process can capture more than 95% of volatile oil and gas, avoiding the problem of direct diffusion of oil and gas in traditional refueling methods.

　　油氣分離環(huán)節(jié)通過物理或化學方法實現(xiàn)油氣與空氣的分離，核心是利用油氣與空氣的物理性質(zhì)差異。吸附法是常見技術(shù)之一，采用活性炭、分子篩等吸附劑，利用其對油氣分子的強吸附力（非極性分子間的范德華力），將油氣從混合氣體中分離出來。當吸附劑達到飽和后，通過加熱（100-120℃）或減壓方式解析，釋放出高濃度油氣供后續(xù)處理。吸收法則利用油氣易溶于特定溶劑（如輕柴油、專用吸收劑）的特性，讓油氣混合氣體與溶劑充分接觸，油氣分子溶解于溶劑中，再通過蒸餾將溶劑與油氣分離，溶劑可循環(huán)使用。膜分離技術(shù)是近年發(fā)展的新型方法，利用特殊高分子膜對油氣的選擇性滲透作用（油氣分子透過膜的速度遠快于空氣分子），在膜兩側(cè)壓力差的驅(qū)動下實現(xiàn)分離，具有能耗低、無二次污染的優(yōu)勢。

　　The oil and gas separation process achieves the separation of oil and gas from air through physical or chemical methods, with the core being the utilization of the differences in physical properties between oil and gas and air. Adsorption method is one of the common techniques, which uses adsorbents such as activated carbon and molecular sieves to separate oil and gas molecules from the mixed gas by utilizing their strong adsorption force (van der Waals force between non-polar molecules). When the adsorbent reaches saturation, it is decomposed by heating (100-120 ℃) or depressurization to release high concentration oil and gas for subsequent processing. The absorption law utilizes the characteristic that oil and gas are easily soluble in specific solvents (such as light diesel oil and specialized absorbents), allowing the oil and gas mixture to fully contact the solvent. Oil and gas molecules dissolve in the solvent, and then the solvent is separated from the oil and gas through distillation. The solvent can be recycled. Membrane separation technology is a new method developed in recent years, which utilizes the selective permeation of oil and gas by special polymer membranes (oil and gas molecules pass through the membrane much faster than air molecules), and is driven by the pressure difference on both sides of the membrane to achieve separation. It has the advantages of low energy consumption and no secondary pollution.

　　油氣回收與再利用環(huán)節(jié)將分離后的高濃度油氣轉(zhuǎn)化為可利用資源，實現(xiàn)能源循環(huán)。對于加油站等小型場景，回收的油氣可通過壓縮機壓縮為液態(tài)汽油，直接回流至油罐，重新進入銷售環(huán)節(jié)，這種 “原地回收” 模式無需復雜的外輸系統(tǒng)，適合分散性站點。大型儲油庫則多采用冷凝法，將分離后的油氣通過多級制冷（溫度逐步降至 - 40 至 - 70℃），使油氣中的烴類物質(zhì)冷凝為液態(tài)，純度可達 90% 以上，可作為燃料或化工原料使用。部分設(shè)備還會結(jié)合催化燃燒技術(shù)，對無法回收的低濃度油氣進行無害化處理，在催化劑作用下將油氣氧化為二氧化碳和水，避免直接排放造成的空氣污染，同時利用燃燒產(chǎn)生的熱量為設(shè)備運行提供能源，提高能量利用效率。

　　The oil and gas recovery and reuse process converts the separated high concentration oil and gas into usable resources, achieving energy cycling. For small scenarios such as gas stations, the recovered oil and gas can be compressed into liquid gasoline through a compressor, directly returned to the oil tank, and re entered into the sales process. This "in-situ recovery" mode does not require complex export systems and is suitable for decentralized stations. Large oil storage facilities often use condensation methods to separate oil and gas through multi-stage refrigeration (gradually reducing the temperature to -40 to -70 ℃), condensing the hydrocarbon substances in the oil and gas into liquid form with a purity of over 90%, which can be used as fuel or chemical raw materials. Some equipment will also combine catalytic combustion technology to harmless treat low concentration oil and gas that cannot be recovered. Under the action of catalysts, the oil and gas will be oxidized into carbon dioxide and water, avoiding air pollution caused by direct emissions. At the same time, the heat generated by combustion will be used to provide energy for equipment operation, improving energy utilization efficiency.

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