What type of boilers are typically used for larger capacities?

High-pressure water-tube boilers are typically utilized for larger capacities because they are designed to handle high pressures and large volumes of steam generation. In these types of boilers, water flows through tubes that sit within the hot gases produced by combustion. This design not only allows for efficient heat transfer but also contributes to rapid steam production, making them well-suited for applications requiring significant steam output.

The construction of water-tube boilers involves a series of tubes filled with water, which can withstand high pressures without risking structural failure. This capability makes them ideal for power plants, large industrial processes, and utility applications where high steam output and pressure are essential.

In contrast, small-scale boilers, medium-pressure boilers, and low-temperature boilers cater to different operational needs and constraints. Small-scale boilers are typically designed for lower capacities and pressures, while medium-pressure boilers serve specialized applications. Low-temperature boilers operate at reduced thermal levels, making them unsuitable for applications requiring the high efficiency and steam output that high-pressure water-tube boilers provide. Thus, the use of high-pressure water-tube boilers in larger capacity systems is a key factor for effective steam generation and operational efficiency.