In the VOCs organic gas treatment device combining condensation and membrane method, condensation temperature is one of the most critical operating parameters. Setting the temperature high results in a decrease in recovery rate and an increase in exhaust concentration; Setting the temperature low increases equipment energy consumption and condensation load. How to strike a balance between recycling efficiency and operating costs is a recurring issue in equipment debugging and daily operation. Only by understanding the control logic of condensation temperature can the VOCs treatment device be adjusted to the optimal state. The WHSH series equipment of Wohong adopts a combination of air-cooled heat exchange and membrane separation process, and its temperature control method is representative.
After entering the device, VOCs organic gases are first pressurized by a compressor and then cooled by an air-cooled heat exchange module. During the cooling process, heavy components with higher boiling points in hydrocarbon gases liquefy first, forming liquid oil products that are recovered; The uncondensed low boiling point components enter the membrane separation module for further concentration treatment. The condensing section undertakes most of the oil recovery tasks, and its efficiency directly affects the treatment effect and energy consumption level of the entire device.
The lower the condensation temperature, the more components can theoretically be condensed and recovered, but the energy consumption is also higher, and too low a temperature may cause problems such as frosting and pipeline blockage. In actual operation, the condensation temperature needs to be set comprehensively based on local climate, oil and gas concentration, and emission requirements: in summer, the ambient temperature is high and the condensation load is large, so attention should be paid to the heat dissipation effect of the heat exchange module; In winter, the temperature is low and the condensation efficiency is naturally high. It is advisable to adjust the operating parameters appropriately to avoid excessive condensation. The WHSH series monitors the heat exchange temperature in real-time through a control system and automatically adjusts the operating status based on the inlet load.
If there is a significant decrease in the amount of recovered oil or an increase in exhaust concentration during operation, first check if the temperature in the condensation section is abnormal. Common reasons include: poor heat dissipation caused by dust accumulation on the fins of the heat exchange module, high ambient temperature exceeding the design working conditions, high compressor exhaust temperature affecting the condensation effect, and malfunction of the air conditioning fan. Regularly cleaning the heat exchange fins and maintaining smooth ventilation around the equipment are the most effective daily measures to maintain condensation efficiency.
The advantage of the combination process of condensation and membrane method lies in its strong fault tolerance. Even if the efficiency of the condensation section fluctuates due to environmental temperature, the membrane separation module can still control the concentration of non methane total hydrocarbons in the exhaust gas below 10 grams per cubic meter, ensuring emissions meet standards. This combination design enables the equipment to operate stably in areas with significant climate differences throughout the four seasons, and is a widely used technical route in current VOCs control projects.
The condensation temperature control does not have a fixed value that remains unchanged, but rather a process that dynamically adjusts based on on-site conditions. By properly managing temperature parameters and maintaining heat exchange equipment, VOCs organic gas treatment devices can maintain efficient and stable operation for a long time.
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