Q: At chemical production sites, what media heating processes are multi-channel explosion-proof temperature control cabinets commonly used to control?
A: Multi-channel explosion-proof temperature control cabinets are mainly used for heating and maintaining the temperature of flowing liquid or gaseous media. Under pressure, low-temperature fluid media enter the inlet of an electric heating vessel through pipelines, flow along specific internal heat exchange channels, absorb the heat generated by electric heating elements, and gradually increase in temperature. The control cabinet can independently control the temperature of multiple heating circuits simultaneously, making it suitable for locations such as chemical and petroleum sites where flammable and explosive gases are present.
Q: How does the control cabinet ensure that the outlet medium temperature is uniform and does not exceed the limit?
A: The internal control system automatically adjusts the output power of the electric heater based on the signal from the outlet temperature sensor, keeping the outlet medium temperature uniform. When the heating element overheats, an independent overheat protection device immediately cuts off the heating power supply, preventing the heated material from coking, deteriorating, or carbonizing due to overtemperature, and also preventing damage to the heating element, which helps extend the service life of the electric heating tube. The outlet temperature can be controlled within the range of ≤650°C, and the temperature control accuracy meets process requirements.
Q: What aspects should on-site operation and maintenance personnel pay attention to in daily work?
A: It is necessary to regularly check whether the temperature sensor signal is accurate, whether the overheat protection device operates reliably, and whether the electrical connections of each heating circuit are loose. For multi-channel control cabinets, the matching between each channel's output power and the corresponding heating element should also be verified to prevent single-channel overload. When the medium flow rate changes, the outlet temperature fluctuation should be observed promptly, and control parameters should be adjusted if necessary to ensure a stable heating process.
