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For fertilizer manufacturing companies, many areas are classified as flammable and explosive zones, which greatly limits the use of certain scale-inhibition technologies available on the market. Based on an analysis of various physical scale-inhibition technologies available on the market, long-pulse ultrasonic scale-inhibition technology is likely the most suitable approach for scale prevention in the heat exchange equipment used by fertilizer companies. However, when applying ultrasonic scale inhibition technology, it is important to distinguish between long-pulse ultrasonic scale inhibition technology and short-pulse ultrasonic scale inhibition technology. Generally speaking, long-pulse ultrasonic scale inhibition technology yields better results but is more expensive, while short-pulse ultrasonic scale inhibition technology provides poorer results but is cheaper. Specifically, the long-pulse ultrasonic scale inhibition technology represents the second generation of ultrasonic technologies. Compared with the short-pulse ultrasonic scale inhibition technology of the first generation, there is a technological difference between them, and the main distinctions are as follows: First, the effective working time is different. The pulse width of short-pulse devices is very short, only a few milliseconds, usually 2.5 ms (with a maximum of 5 ms), and the pulse interval is fixed at 80 ms; thus, the effective working time per second is only around 30.3 ms. The pulse width of the long-pulse device can be adjusted between 100ms and 500ms, and the pulse interval can also be adjusted within the same range. The maximum effective operating time per second is 833.33ms, which is approximately 27.5 times that of short pulses. II. The device powers differ: the short-pulse device consists of 1 main unit equipped with 4 transducers, with each transducer having an average power of around 30W; thus, the power is low, resulting in weak capabilities for preventing and removing scale. Long-pulse devices consist of one main unit paired with one transducer; the average power of each transducer is around 200W–400W, which is 8–10 times higher than that of short-pulse devices, granting them stronger capabilities in preventing and removing scale. III. Different descaling capabilities: Short-pulse devices are designed primarily to deal with brittle, hard deposits such as those made of calcium and magnesium, by causing small cracks in these deposits so that they can be removed gradually. The treatment effect on organic biofilm-type scale or flexible scale is not very satisfactory, as such scales possess a certain degree of elasticity and are able to absorb the energy of short ultrasonic pulses; since devices that generate short pulses have low power, most of the energy is absorbed and insufficient energy is available for effective scaling removal. Long-pulse devices are effective in dealing with various types of scaling, such as hard scale, soft scale (like biological sludge and sedimentary scale), and scaling caused by crust formation. Due to the high power of the transducers in long-pulse devices, they can handle the energy absorption caused by soft and flexible scales during scale inhibition and removal, and can provide sufficient continuous energy to remove the scales. IV. Different application scenarios: Short-pulse devices are mainly suitable for situations where scaling occurs slowly or to a mild extent, as well as in cases of hard scaling; they are less suitable for situations where scaling happens rapidly or on a severe scale. Long-pulse devices can be applied to almost all scaling scenarios, and their advantages are particularly evident in situations where scaling occurs rapidly and to a severe extent.