Spiral plate heat exchangers are classified into three types according to their structure: Type I (non-removable), Type II (removable, one channel can be disassembled), and Type III (through-type/removable, both channels can be disassembled). The core feature of Type III through-type heat exchangers is that both channels are completely open, allowing for disassembly and cleaning, and the gas and liquid operate in a cross-flow heat exchange manner.
Structural Features
Both channels are removable: Both spiral channels of the Type III heat exchanger can be disassembled, facilitating thorough mechanical cleaning and maintenance, and offering a wider range of applications than Type II, which only has a single removable channel.
Large diameter and low pressure drop: The through-type design provides excellent channel clearance at the condensing end, resulting in a typically very low pressure drop in the gas channel.
Through-type structure facilitates blowdown: With both ends of the channel open, media containing particles, fibers, and dirt are less likely to accumulate and clog, making venting and flushing convenient.
Core Advantages
Advantages and Specific Manifestations
High Heat Transfer Efficiency: The fluid is in a turbulent state within the spiral channel, resulting in a high heat transfer coefficient; replacing shell-and-tube heat exchangers with Type III improves efficiency by approximately double.
Compact Structure: The heat transfer area per unit volume is approximately three times that of shell-and-tube heat exchangers, requiring less floor space.
Strong Anti-fouling Capacity: Self-cleaning action reduces fouling at only 1/10 the rate of shell-and-tube heat exchangers.
Easy Maintenance: Both channels can be opened for cleaning, resulting in low maintenance costs.
Reliable Sealing: The detachable structure with sealing components minimizes thermal stress and enhances adaptability.
Utilizing Low-Temperature Heat Sources: Allows for low temperature differences, making it suitable for recovering low-temperature heat energy.