VOCs冷凝回收，特别是深冷冷凝（主要为机械压缩式），之前大家称之为油气回收比较多，这是因为VOCs深冷设备主要最先运用在油气回收行业，特别是储罐装车逸散气及储罐大小呼吸逸散气的高浓度小风量的冷凝回收。

　　VOCs condensation recovery, especially deep cold condensation (mainly mechanical compression type), was previously commonly referred to as oil and gas recovery. This is because VOCs deep cold equipment was first used in the oil and gas recovery industry, especially for high concentration and low air volume condensation recovery of tank loading and tank size breathing gases.

　　除了实现环保达标，在经济效益上也比较明显，这主要是一些纯溶剂的回收的经济价值。如今，VOCs深冷运用在化工行业的预处理越来越广泛。VOCs冷凝回收装置设计及运维有哪些要点值得注意？快随优乐蜂一起来看看吧~

　　In addition to achieving environmental standards, there are also significant economic benefits, mainly due to the economic value of recycling some pure solvents. Nowadays, VOCs cryogenic treatment is becoming increasingly widely used in the chemical industry for pretreatment. What are the key points worth noting in the design and operation of VOCs condensation recovery equipment? Come and take a look with Youle Bee~

　　一、关键参数①预冷器运行温度在混合气各组分的凝固点以上，进入装置的混合气温度降到4℃时，可将大部分水除去，机械制冷可使大部分VOCs 冷凝为液体而回收；若需要更低的冷温度，可以再连接液氮制冷，从而提高VOCs 回收率。

　　1、 Key parameter ①: The operating temperature of the pre cooler is above the freezing point of each component in the mixed gas. When the temperature of the mixed gas entering the device drops to 4 ℃, most of the water can be removed, and mechanical refrigeration can condense most of the VOCs into liquid for recovery; If a lower cooling temperature is required, liquid nitrogen refrigeration can be connected to improve the VOCs recovery rate.

　　②运行过程中，应密切注意冷凝温度。降低冷凝温度，可以提高压缩机制冷量，降低功率消耗，提高制冷系数。但冷凝温度过低会影响到制冷剂的循环量，使制冷量下降。

　　② During operation, close attention should be paid to the condensation temperature. Lowering the condensation temperature can increase the cooling capacity of the compressor, reduce power consumption, and improve the refrigeration coefficient. However, a low condensation temperature can affect the circulation of refrigerant, resulting in a decrease in cooling capacity.

　　③ R402a 与R402b 作为短期制冷剂能够发挥很好的效果，而R404a 与R407a 可以作为长期使用制冷剂。

　　③ R402a and R402b can perform well as short-term refrigerants, while R404a and R407a can be used as long-term refrigerants.

　　④一般对于油气回收集成工艺来说，冷凝段温度可控制在-40～-50℃（为了使回收装置的排放浓度控制在很低水平）或-20～-30℃（为了使回收装置的投资成本及能耗控制在低水平）。

　　④ For the integrated process of oil and gas recovery, the temperature of the condensation section can be controlled at -40 to -50 ℃ (to keep the emission concentration of the recovery device at a very low level) or -20 to -30 ℃ (to keep the investment cost and energy consumption of the recovery device at a low level).

　　二、其他要求控制和调整压缩机吸气压力、排气压力、膨胀阀前的制冷剂温度等在合理范围内。

　　2、 Other requirements include controlling and adjusting the suction pressure, discharge pressure, and refrigerant temperature before the expansion valve of the compressor within a reasonable range.

　　如下为冷凝装置运行维护要求：

　　The following are the operation and maintenance requirements for the condensing device:

　　冷却器/冷凝器需要检查其处理效果，检查要点为：不凝性气体收集净化情况，相关说明：收集净化情况差，说明污染排放多

　　The treatment effect of the cooler/condenser needs to be checked, with the key points being the collection and purification of non condensable gases. Relevant instructions: Poor collection and purification indicates high pollution emissions

　　设备内部零部件情况，检查要点为：蒸发型冷却器的喷嘴雾化状况，相关说明：喷嘴雾化效果差，则冷却效果差

　　The condition of internal components of the equipment, the key points for inspection are: the atomization condition of the nozzle of the evaporative cooler. Relevant instructions: If the atomization effect of the nozzle is poor, the cooling effect is poor

　　设备内部零部件情况，检查要点为：开式冷却系统的冷却水混浊度，相关说明：冷却水水质越混浊，冷却效果越差

　　The condition of internal components of the equipment, the key points for inspection are: the turbidity of the cooling water in the open cooling system. Relevant instructions: the more turbid the cooling water quality, the worse the cooling effect

　　设备内部零部件情况，检查要点为：设备内外壁，相关说明：是否有水垢积聚等现象，特别是壳管式冷凝器

　　The condition of internal components of the equipment, the key points for inspection are: the inner and outer walls of the equipment, relevant instructions: whether there is scale accumulation, especially for shell and tube condensers

　　操作参数是否正常稳定,检查要点为：出口温度，相关说明：出口温度变高，冷却/冷凝效果变差

　　Whether the operating parameters are normal and stable, the key points for inspection are: outlet temperature. Relevant instructions: If the outlet temperature increases, the cooling/condensing effect will deteriorate

　　操作参数是否正常稳定,检查要点为：冷却介质流量和压力，相关说明：冷却介质流量低、压力低，则冷却/冷凝效果差

　　Whether the operating parameters are normal and stable, the key points for inspection are: cooling medium flow rate and pressure. Relevant instructions: If the cooling medium flow rate is low and the pressure is low, the cooling/condensing effect is poor

　　操作参数是否正常稳定,检查要点为：出口温度与冷却介质进口温度的差值，相关说明：差值越小，说明冷却/冷凝效果差

　　Whether the operating parameters are normal and stable, the key points to check are: the difference between the outlet temperature and the inlet temperature of the cooling medium. Relevant explanation: the smaller the difference, the worse the cooling/condensing effect

　　有机溶剂回收量,检查要点为：冷凝器溶剂回收量，相关说明：回收量变少，冷凝效果变差/回收量变化率大，设施运行不稳定

　　The key points for checking the amount of organic solvent recovery are: the amount of solvent recovery in the condenser. Relevant instructions: If the amount of recovery decreases, the condensation effect will deteriorate/the rate of change in the amount of recovery will be large, and the operation of the facility will be unstable

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